CN107113846A

CN107113846A - Reception, sending method and the device of Downlink Control Information

Info

Publication number: CN107113846A
Application number: CN201580065160.7A
Authority: CN
Inventors: 南方; 余政; 马修·威廉·韦伯
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-08-14
Filing date: 2015-08-14
Publication date: 2017-08-29
Also published as: WO2017028071A1

Abstract

The embodiment of the present invention provides reception, sending method and the device of Downlink Control Information, at least to solve the problem of being designed without considering 6 PRB pair situations of EPDCCH in the prior art.Sending method includes：Determine the control channel element of one of Physical Downlink Control Channel candidate in one or more of Physical Downlink Control Channel set Physical Downlink Control Channel candidate, the control channel element is the control channel element in the control channel element included for the PRB pair of Physical Downlink Control Channel set, PRB pair for Physical Downlink Control Channel set constitutes the PRB pair set of Physical Downlink Control Channel, wherein, in subframe k, PRB pair set includes 6 PRB pairs, there are 2 control channel elements in the control channel element that PRB pair in PRB pair set is included, first Physical Downlink Control Channel candidate is made up of 2 control channel elements in subframe k and takes 6 PRB pairs；DCI is sent by one of Physical Downlink Control Channel candidate.The present invention is applied to wireless communication field.

Description

Method and device for receiving and sending downlink control information

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for receiving and transmitting downlink control information.

Background

In Machine Type Communication (MTC), since there are many UEs, it is generally required to reduce the complexity or cost of the UE.

In the prior art, reducing the bandwidth of receiving and/or transmitting signals supported by a UE is one of the main techniques for reducing the complexity or cost of the UE. For example, the bandwidth of the received and/or transmitted signals supported by the UE is only 1.4 MHz.

For a UE performing MTC application (hereinafter, referred to as MTC UE), Downlink Control Information (DCI) is carried through a Physical Downlink Control Channel (PDCCH) of MTC. Among them, PDCCH of MTC may also be referred to as MPDCCH. The MPDCCH is designed similarly to an Enhanced Physical Downlink Control Channel (EPDCCH), but the EPDCCH is designed only in consideration of 2, 4, or 8 Physical Resource Block (PRB) pairs, and a bandwidth of 1.4MHz received and/or transmitted signals supported by the MTC UE only includes 6 PRB pairs at most. If the DCI is transmitted through 8 PRB pairs, DCI transmission failure may be caused due to exceeding the capability of the MTC UE; if the DCI is transmitted through 2 PRB pairs or 4 PRB pairs, because the DCI transmission is limited to be within 2 PRB pairs or 4 PRB pairs, the PRB pairs within the bandwidth of receiving and/or transmitting signals supported by the MTC UE cannot be fully utilized, which may result in that the DCI transmission may not obtain the maximum frequency diversity gain.

Disclosure of Invention

Embodiments of the present invention provide methods and apparatuses for receiving and sending downlink control information, so as to at least solve the problems that, when an MPDCCH in the prior art adopts a design similar to an EPDCCH, the EPDCCH design does not consider the situation of 6 PRB pairs, and therefore, the frequency width of a PRB pair occupied by DCI transmission exceeds the received signal bandwidth of MTC UE, and DCI transmission cannot obtain the maximum frequency diversity gain.

In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, a method for sending downlink control information DCI is provided, where the method includes: determining a control channel element of one of the one or more physical downlink control channel candidates in the set of physical downlink control channels, the control channel elements are control channel elements of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pairs for the set of physical downlink control channels constitute a set of PRB pairs for physical downlink control channels, wherein, in subframe k, the set of PRB pairs comprises 6 PRB pairs, each control channel element consisting of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements contained in the PRB pairs in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements in subframe k and occupies 6 PRB pairs;

and transmitting the DCI through the one physical downlink control channel candidate.

With reference to the first aspect, in a first possible implementation manner of the first aspect, in a subframe k, the subframe k is used for a physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

in which is shownThe set X for the physical downlink control channel_mThe number of PRB pairs; indicating the number of resource element groups constituting each control channel element; representing the number of control channel elements contained in each PRB pair; represents rounding down; represents rounding up; mod () represents a remainder; max (a1, a2) indicates taking the larger of a1 and a 2.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, in a subframe k, the number of control channel elements included in a PRB pair set p of a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

Wherein, Y_p,kstartThe method comprises the steps that calculation is carried out according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field orIs equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.

In a second aspect, another method for transmitting downlink control information DCI is provided, where the method includes:

determining a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element in control channel elements included in a Physical Resource Block (PRB) pair used in the physical downlink control channel set, the PRB pair used in the physical downlink control channel set forms a PRB pair set of a physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in a subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes a plurality of PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, each control channel element is a control channel element included in a PRB pair in one PRB pair subset, and when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the plurality of PRB pair subsets When the number of the control channel elements included in the PRB pair in each subset in the set is the minimum, the control channel elements constituting the third physical downlink control channel candidate are the control channel elements included in the PRB pairs in at least two PRB pairs in the plurality of PRB pairs;

With reference to the second aspect, in a first possible implementation manner of the second aspect, the numbers of the control channel elements included in the PRB pairs in the PRB pair set are obtained by interleaving and numbering the control channel elements included in the PRB pairs in the multiple PRB pair subsets in the PRB pair set.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the set of PRB pairs includes PRB pair subset 0, PRB pair subset 1, … …, and PRB pair subset S-1, which are S PRB pair subsets, where the set of PRB pairs includes PRB pair subset S and PRB pair subset S-1The ratio of the number of the PRB pairs respectively contained in the S PRB pair subsets is X₀：X₁：……X_S-1；

The interleaving numbering control channel elements comprised by PRB pairs of the plurality of PRB pair subsets of the set of PRB pairs comprises:

sequentially-numbered Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。

With reference to the second aspect, or the first possible implementation manner of the second aspect, or the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, in a subframe k, the number of control channel elements included in a PRB pair set p of a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

Wherein, Y_p,kstartThe physical downlink control channel candidate is calculated according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidate is located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidate is located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidate is located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.

With reference to the second aspect, in a fifth possible implementation manner of the second aspect, the control channel elements that constitute the third physical downlink control channel candidate are discontinuous control channel elements with numbers.

With reference to the second aspect or any one of the first to fifth possible implementation manners of the second aspect, in a sixth possible implementation manner of the second aspect, before determining a control channel element of one of the one or more physical downlink control channel candidates in the physical downlink control channel set, the method further includes:

determining PRB pairs contained in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel.

With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner of the second aspect, after the determining PRB pairs included in the multiple PRB pair subsets in the PRB pair set of the physical downlink control channel, the method further includes:

and sending a second signaling to a receiving end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S represents the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer.

In a third aspect, a method for receiving downlink control information DCI is provided, where the method includes: determining a control channel element of one of the one or more physical downlink control channel candidates in the set of physical downlink control channels, the control channel elements are control channel elements of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pairs for the set of physical downlink control channels constitute a set of PRB pairs for physical downlink control channels, wherein, in subframe k, the set of PRB pairs comprises 6 PRB pairs, each control channel element consisting of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements contained in the PRB pairs in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements in subframe k and occupies 6 PRB pairs;

and receiving the DCI through the one physical downlink control channel candidate.

With reference to the third aspect, in a first possible implementation manner of the third aspect, in a subframe k, the subframe k is used for a physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

wherein the set X for the physical downlink control channel is represented_mThe number of PRB pairs; indicating the number of resource element groups constituting each control channel element; representing the number of control channel elements contained in each PRB pair; represents rounding down; represents rounding up; mod () represents a remainder; max (a1, a2) indicates taking the larger of a1 and a 2.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, in a subframe k, the number of control channel elements included in a PRB pair set p of a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

Wherein, Y_p,kstartThe method comprises the steps that calculation is carried out according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.

In a fourth aspect, another method for receiving downlink control information DCI is provided, where the method includes:

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the numbers of the control channel elements included in the PRB pairs in the PRB pair set are obtained by interleaving and numbering the control channel elements included in the PRB pairs in the multiple PRB pair subsets in the PRB pair set.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the PRB pair set includes PRB pair subsets 0,1, … …, and S PRB pair subsets S-1, where the ratio of the number of PRB pairs respectively included in each S PRB pair subsets is X₀：X₁：……X_S-1；

sequentially numbered PRB pairsY in subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect or the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, in a subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

Wherein, Y_p,kstartIs calculated according to a predefined functional relation, wherein the predefined functional relation is a wireless network temporary identifier and a starting subframe of one or more subframes in which the physical downlink control channel candidate is positionedA function of one or more of the subframe number of (a), the sequence number of the first slot of the starting subframe of the one or more subframes in which the physical downlink control channel candidates are located, and the sequence number of the second slot of the starting subframe of the one or more subframes in which the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.

With reference to the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the control channel elements that constitute the third physical downlink control channel candidate are discontinuous control channel elements with numbers.

With reference to the fourth aspect or any one of the first possible implementation manner to the fifth possible implementation manner of the fourth aspect, in a sixth possible implementation manner of the fourth aspect, before the determining a control channel element of one of the one or more physical downlink control channel candidates in the physical downlink control channel set, the method further includes:

With reference to the sixth possible implementation manner of the fourth aspect, in a seventh possible implementation manner of the fourth aspect, before the determining PRB pairs included in the plurality of PRB pair subsets of the PRB pair set of the physical downlink control channel, the method further includes:

determining PRB pairs in the PRB pair set of the physical downlink control channel;

receiving a second signaling sent by a sending end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S represents the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer;

the determining the PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel includes:

determining the PRB pairs contained in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs in the PRB pair set of the physical downlink control channel and the second signaling.

With reference to the seventh possible implementation manner of the fourth aspect, in an eighth possible implementation manner of the fourth aspect, when T is 1, the determining, according to the PRB pairs in the set of PRB pairs of the physical downlink control channel and the second signaling, PRB pairs included in the plurality of sets of PRB pairs in the set of PRB pairs of the physical downlink control channel includes:

determining PRB pairs contained in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling;

determining that the PRB pairs contained in the complement of the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel are the PRB pairs contained in the remaining T PRB pair subsets in the PRB pair set of the physical downlink control channel.

With reference to the seventh possible implementation manner of the fourth aspect, in a ninth possible implementation manner of the fourth aspect, when T >1, the determining, according to the PRB pair in the PRB pair set of the physical downlink control channel and the second signaling, PRB pairs included in the multiple PRB pair sets of the PRB pair set of the physical downlink control channel includes:

determining PRB pairs contained in T-1 PRB subsets except the S-T PRB subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs contained in the S-T PRB subsets in combination with a first preset rule;

determining that the PRB pairs contained in the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel and the complementary set of the T-1 PRB pair subsets are the PRB pairs contained in the remaining 1 PRB pair subset in the PRB pair set of the physical downlink control channel.

In a fifth aspect, a device for transmitting downlink control information DCI is provided, where the device for transmitting DCI includes: a determining unit and a transmitting unit;

the determining unit is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, and the PRB pair for the physical downlink control channel set forms a PRB pair set of physical downlink control channels, where, in a subframe k, the PRB pair set includes 6 PRB pairs, each control channel element is composed of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in a PRB pair in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements and occupies 6 control channel elements in the subframe k A PRB pair;

the sending unit is configured to send the DCI through the one of the physical downlink control channel candidates.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, in a subframe k, the subframe k is used for a physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, in a subframe k, the number of control channel elements included in a PRB pair set p of a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

In a sixth aspect, there is provided another apparatus for transmitting downlink control information DCI, where the apparatus for transmitting DCI includes: a determining unit and a transmitting unit;

the determining unit is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes multiple PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, and each control channel element is a control channel element included in a PRB pair in one PRB pair subset, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in PRB pairs in each of the plurality of PRB pairs, the control channel elements constituting the third physical downlink control channel candidate are control channel elements among the control channel elements included in PRB pairs in at least two PRB pairs of the plurality of PRB pairs;

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the DCI transmitting apparatus further includes a numbering unit;

the number of the control channel element included in the PRB pair set is obtained by interleaving and numbering the control channel element included in the PRB pair in the plurality of PRB pair subsets in the PRB pair set by the numbering unit.

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the PRB pair set includes PRB pair subsets 0,1, … …, and S PRB pair subsets S-1, where the ratio of the number of PRB pairs respectively included in each S PRB pair subsets is X₀：X₁：……X_S-1；

The numbering unit is specifically configured to:

With reference to the sixth aspect or the first possible implementation manner of the sixth aspect or the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, in a subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the third possible implementation manner of the sixth aspect, in a fourth possible implementation manner of the sixth aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

Wherein, Y_p,kstartIs calculated according to a predefined functional relationIs a function of one or more of a radio network temporary identifier, a subframe number of a starting subframe of one or more subframes in which the pdcch candidates are located, a sequence number of a first slot of the starting subframe of the one or more subframes in which the pdcch candidates are located, and a sequence number of a second slot of the starting subframe of the one or more subframes in which the pdcch candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.

With reference to the sixth aspect, in a fifth possible implementation manner of the sixth aspect, the control channel elements that constitute the third physical downlink control channel candidate are discontinuous control channel elements.

With reference to the sixth aspect or any one of the first possible implementation manner to the fifth possible implementation manner of the sixth aspect, in a sixth possible implementation manner of the sixth aspect, the determining unit is further configured to determine PRB pairs included in the plurality of PRB pair subsets of the physical downlink control channel set before determining a control channel element of one or more physical downlink control channel candidates in the physical downlink control channel set.

With reference to the sixth possible implementation manner of the sixth aspect, in a seventh possible implementation manner of the sixth aspect, the sending unit is further configured to send, after the determining unit determines the PRB pairs included in the plurality of PRB pair subsets in the set of PRB pairs of the physical downlink control channel, a second signaling to a receiving end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the set of PRB pairs of the physical downlink control channel, S denotes the number of PRB pair subsets in the set of PRB pairs of the physical downlink control channel, and T is a fixed positive integer.

A seventh aspect provides a receiving apparatus for downlink control information DCI, where the receiving apparatus for DCI includes: a determining unit and a receiving unit;

the receiving unit is configured to receive the DCI through the one of the physical downlink control channel candidates.

With reference to the seventh aspect, in a first possible implementation manner of the seventh aspect, in a subframe k, the subframe k is used for a physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

With reference to the seventh aspect or the first possible implementation manner of the seventh aspect, in a second aspect of the seventh aspectIn a possible implementation manner, in the subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the second possible implementation manner of the seventh aspect, in a third possible implementation manner of the seventh aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

In an eighth aspect, there is provided another apparatus for receiving downlink control information DCI, where the apparatus for receiving DCI includes: a determining unit and a receiving unit;

With reference to the eighth aspect, in a first possible implementation manner of the eighth aspect, the DCI receiving apparatus further includes a numbering unit;

With reference to the first possible implementation manner of the eighth aspect, in a second possible implementation manner of the eighth aspect, the PRB pair set includes PRB pair subsets 0,1, … …, and S PRB pair subsets S-1, where the ratio of the number of PRB pairs respectively included in each S PRB pair subsets is X₀：X₁：……X_S-1；

The numbering unit is specifically configured to:

sequence-first numbered PRBFor Y in subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。

With reference to the eighth aspect or the first possible implementation manner of the eighth aspect or the second possible implementation manner of the eighth aspect, in a third possible implementation manner of the eighth aspect, in a subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the third possible implementation manner of the eighth aspect, in a fourth possible implementation manner of the eighth aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is represented by

Wherein, Y_p,kstartIs calculated according to a predefined functional relation, wherein the predefined functional relation is a wireless network temporary identifier and a starting sub-frame of one or more sub-frames where the physical downlink control channel candidate is positionedA function of one or more of a subframe number of a frame, a number of a first slot of a starting subframe of one or more subframes in which the physical downlink control channel candidates are located, and a number of a second slot of a starting subframe of one or more subframes in which the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.

With reference to the eighth aspect, in a fifth possible implementation manner of the eighth aspect, the control channel elements that constitute the third physical downlink control channel candidate are discontinuous control channel elements with numbers.

With reference to the eighth aspect or any one of the first to fifth possible implementation manners of the eighth aspect, in a sixth possible implementation manner of the eighth aspect, the determining unit is further configured to determine PRB pairs included in the plurality of PRB pair sets of the physical downlink control channel before determining a control channel element of one or more physical downlink control channel candidates in the physical downlink control channel set.

With reference to the sixth possible implementation manner of the eighth aspect, in a seventh possible implementation manner of the eighth aspect, the determining unit is further configured to determine a PRB pair in the set of PRB pairs of the physical downlink control channel before determining a PRB pair included in the plurality of sets of PRB pairs in the set of PRB pairs of the physical downlink control channel;

the receiving unit is further configured to receive a second signaling sent by a sending end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S denotes the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer;

the determining unit is specifically configured to:

With reference to the seventh possible implementation manner of the eighth aspect, in an eighth possible implementation manner of the eighth aspect, when T is 1, the determining unit is specifically configured to:

With reference to the seventh possible implementation manner of the eighth aspect, in a ninth possible implementation manner of the eighth aspect, when T >1, the determining unit is specifically configured to:

In a ninth aspect, there is provided a DCI transmission apparatus, including: a processor and a transmitter;

the processor is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, and the PRB pair for the physical downlink control channel set forms a PRB pair set of physical downlink control channels, where, in a subframe k, the PRB pair set includes 6 PRB pairs, each control channel element is composed of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in a PRB pair in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements and occupies 6 PRB in the subframe k Carrying out pairing;

the transmitter is configured to transmit the DCI through the one of the physical downlink control channel candidates.

With reference to the ninth aspect, in a first possible implementation manner of the ninth aspect, in the subframe k, the information is used for the physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

With reference to the ninth aspect or the first possible implementation manner of the ninth aspect, in a second possible implementation manner of the ninth aspect, in the subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel elementComposition when N is_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the second possible implementation manner of the ninth aspect, in a third possible implementation manner of the ninth aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is

A tenth aspect provides a DCI transmission apparatus, including: a processor and a transmitter;

the processor is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes multiple PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, and each control channel element is a control channel element included in a PRB pair in one PRB pair subset, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in PRB pairs in each of the plurality of PRB pairs, the control channel elements constituting the third physical downlink control channel candidate are control channel elements among the control channel elements included in PRB pairs in at least two PRB pairs of the plurality of PRB pairs;

With reference to the tenth aspect, in a first possible implementation manner of the tenth aspect, the numbers of the control channel elements included in the PRB pairs in the set of PRB pairs are obtained by interleaving and numbering, by the processor, the control channel elements included in the PRB pairs in the plurality of PRB pairs in the set of PRB pairs.

With reference to the first possible implementation manner of the tenth aspect, in a second possible implementation manner of the tenth aspect, the PRB pair set includes PRB pair subsets 0,1, … …, and S PRB pair subsets S-1, where the ratio of the number of PRB pairs respectively included in each S PRB pair subsets is X₀：X₁：……X_S-1；

The processor is specifically configured to:

sequentially-numbered Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Individual control channel elements, … …, up to the control contained by a PRB pair in the set of PRB pairsChannel element numbering is done, where Y₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。

With reference to the tenth aspect or the first possible implementation manner of the tenth aspect or the second possible implementation manner of the tenth aspect, in a third possible implementation manner of the tenth aspect, in a subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the third possible implementation manner of the tenth aspect, in a fourth possible implementation manner of the tenth aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is represented by

With reference to the tenth aspect, in a fifth possible implementation manner of the tenth aspect, the control channel elements that constitute the third physical downlink control channel candidate are discontinuous control channel elements with numbers.

With reference to the tenth aspect or any one of the first to the fifth possible implementation manners of the tenth aspect, in a sixth possible implementation manner of the tenth aspect, the processor is further configured to determine PRB pairs included in the plurality of PRB pair subsets of the set of PRB pairs of the physical downlink control channel before determining a control channel element of one or more physical downlink control channel candidates of the set of physical downlink control channel.

With reference to the sixth possible implementation manner of the tenth aspect, in a seventh possible implementation manner of the tenth aspect, the apparatus is further configured to send a second signaling to a receiving end after the processor determines PRB pairs included in the plurality of PRB pair subsets in the set of PRB pairs of the physical downlink control channel, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the set of PRB pairs of the physical downlink control channel, S denotes the number of PRB pair subsets in the set of PRB pairs of the physical downlink control channel, and T is a fixed positive integer.

In an eleventh aspect, a device for receiving downlink control information DCI is provided, where the device for receiving DCI includes: a processor and a receiver;

the receiver is configured to receive the DCI through the one of the physical downlink control channel candidates.

With reference to the eleventh aspect, in a first possible implementation manner of the eleventh aspect, in a subframe k, the subframe k is used for a physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

With reference to the eleventh aspect or the first possible implementation manner of the eleventh aspect, in a second possible implementation manner of the eleventh aspect, in a subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1Control ofNumbered consecutive L of channel elements into the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the second possible implementation manner of the eleventh aspect, in a third possible implementation manner of the eleventh aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

A twelfth aspect provides a receiving apparatus of downlink control information DCI, where the receiving apparatus of DCI includes: a processor and a receiver;

With reference to the twelfth aspect, in a first possible implementation manner of the twelfth aspect, the numbers of the control channel elements included in the PRB pairs in the set of PRB pairs are obtained by interleaving and numbering, by the processor, the control channel elements included in the PRB pairs in the plurality of PRB pairs in the set of PRB pairs.

With reference to the first possible implementation manner of the twelfth aspect, in a second possible implementation manner of the twelfth aspect, the PRB pair set includes PRB pair subsets 0,1, … …, and S PRB pair subsets S-1, where the ratio of the number of PRB pairs respectively included in each S PRB pair subsets is X₀：X₁：……X_S-1；

The processor is specifically configured to:

In combination with the twelfth aspect or the twelfth aspectIn a third possible implementation manner of the twelfth aspect, in the subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

With reference to the third possible implementation manner of the twelfth aspect, in a fourth possible implementation manner of the twelfth aspect, a control channel element number corresponding to an mth physical downlink control channel candidate among the physical downlink control channel candidates is denoted by

With reference to the twelfth aspect, in a fifth possible implementation manner of the twelfth aspect, the control channel elements that constitute the third physical downlink control channel candidate are discontinuous control channel elements with numbers.

With reference to the twelfth aspect or any one of the first possible implementation manner to the fifth possible implementation manner of the twelfth aspect, in a sixth possible implementation manner of the twelfth aspect, the processor is further configured to determine PRB pairs included in the plurality of PRB pair subsets of the physical downlink control channel set before determining a control channel element of one of the one or more physical downlink control channel candidates of the physical downlink control channel set.

With reference to the sixth possible implementation manner of the twelfth aspect, in a seventh possible implementation manner of the twelfth aspect, the processor is further configured to determine a PRB pair in the set of PRB pairs of the physical downlink control channel before determining a PRB pair included in the plurality of sets of PRB pairs in the set of PRB pairs of the physical downlink control channel;

the receiver is further configured to receive a second signaling sent by a sending end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S denotes the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer;

the processor is specifically configured to:

With reference to the seventh possible implementation manner of the twelfth aspect, in an eighth possible implementation manner of the twelfth aspect, when T is 1, the processor is specifically configured to:

With reference to the seventh possible implementation manner of the twelfth aspect, in a ninth possible implementation manner of the twelfth aspect, the processor is specifically configured to:

Based on the receiving and sending method and apparatus for DCI provided by the embodiments of the present invention, on one hand, since the control channel elements of the physical downlink channel candidates for receiving/sending DCI determined by the embodiments of the present invention are control channel elements in the control channel elements included in the PRB pairs used for the physical downlink control channel set, and the PRB pairs used for the physical downlink control channel set form a PRB pair set of the physical downlink control channel, where in subframe k, the PRB pair set includes 6 PRB pairs, that is, the embodiments of the present invention provide a design scheme for a physical downlink channel including only 6 PRB pairs at most in a bandwidth for receiving and/or sending a signal, so that when an MPDCCH in the prior art adopts a design similar to an EPDCCH, a case of 6 PRB pairs is not considered in the design of the EPDCCH, and a frequency width of a PRB pair occupied by DCI transmission exceeds a receiving signal bandwidth of an mtue, and DCI transmission cannot obtain the maximum frequency diversity gain. On the other hand, in the embodiment of the present invention, 2 control channel elements exist in the control channel elements included in the PRB pair set, and the first physical downlink control channel candidate is composed of the 2 control channel elements in the subframe k and occupies 6 PRB pairs, that is, PRB pairs in which resource element groups corresponding to the control channel elements constituting the first physical downlink control channel candidate in the physical downlink control channel set are located are uniformly distributed in all PRB pairs included in the PRB pair set of the physical downlink control channel as much as possible, so that it is ensured that DCI transmission obtains a large frequency diversity gain, and the performance of DCI transmission is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of PDCCH, PDSCH and EPDCCH multiplexing in the prior art;

fig. 2 is a schematic diagram of a communication system for DCI transmission according to an embodiment of the present invention;

fig. 3 is a first flowchart of a method for sending DCI according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a first pdcch candidate according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating a second method for sending DCI according to an embodiment of the present invention;

fig. 6 is a third schematic flow chart of a DCI transmission method according to an embodiment of the present invention;

fig. 7 is a first schematic diagram of a third candidate for a physical downlink control channel according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a third candidate physical downlink control channel according to the embodiment of the present invention;

fig. 9 is a fourth schematic flowchart of a DCI transmission method according to an embodiment of the present invention;

fig. 10 is a first flowchart illustrating a DCI receiving method according to an embodiment of the present invention;

fig. 11 is a flowchart illustrating a second method for receiving DCI according to an embodiment of the present invention;

fig. 12 is a third schematic flowchart of a DCI receiving method according to an embodiment of the present invention;

fig. 13 is a fourth schematic flowchart of a DCI receiving method according to an embodiment of the present invention;

fig. 14 is a first schematic structural diagram of a DCI transmitting apparatus according to an embodiment of the present invention;

fig. 15 is a second schematic structural diagram of a DCI transmitting apparatus according to an embodiment of the present invention;

fig. 16 is a first schematic structural diagram of a DCI receiving apparatus according to an embodiment of the present invention;

fig. 17 is a schematic structural diagram of a DCI receiving apparatus according to an embodiment of the present invention.

Detailed Description

For clarity and conciseness of the following descriptions of the various embodiments, a brief introduction to the related art is first given:

in a Long Term Evolution (LTE) or LTE-Advanced (LTE-a) system, an Orthogonal Frequency Division Multiple Access (OFDMA) scheme is usually used as a downlink Multiple Access scheme. The downlink resources of the system are divided into Orthogonal Frequency Division Multiplexing (OFDM) symbols in terms of time and subcarriers in terms of Frequency. According to the LTE standard, a normal downlink subframe includes two slots (slot), each slot includes 7 OFDM symbols in the case of a conventional Cyclic Prefix (CP), and each slot includes 6 OFDM symbols in the case of an extended CP. The time-frequency Resource formed by one OFDM symbol and one subcarrier is called Resource Element (RE). The size of a Physical Resource Block (PRB) is defined as a time slot in time and 180kHz in frequency domain. When the subcarrier spacing is 15kHz, one PRB contains 12 subcarriers in frequency, and in this case one PRB contains 84 or 72 REs in total. And numbering the PRBs in the frequency domain, namely, the PRBs are the PRB indexes. One PRB pair (PRB pair) is defined as a pair of PRBs with the same PRB index for two slots on one subframe.

Information interaction between a base station and a UE in an LTE system can be roughly classified into two categories: control information and traffic data. These information are carried in the physical layer through physical channels, one physical channel corresponding to one set of REs. The Downlink Control Information (DCI) mainly includes scheduling Information of uplink and Downlink service data, a request for reporting an aperiodic channel quality indicator, a notification of a multicast Control channel change, an uplink power Control command, and the like.

In release 10 and previous releases of LTE, DCI is carried through a Physical Downlink Control Channel (PDCCH for short). The PDCCH and a Physical Downlink Shared Channel (PDSCH) carrying Downlink traffic data are time division multiplexed in one subframe. The PDCCH occupies the first n (n is one of 1,2, 3, and 4) OFDM symbols of one subframe, and the PDSCH occupies the remaining OFDM symbols. The PDCCH is mapped across the entire system bandwidth in the frequency domain.

In the LTE system after release 10, in order to increase the capacity of the Control Channel, an Enhanced Physical Downlink Control Channel (EPDCCH) is introduced. The resources of the EPDCCH are divided from the original PDSCH region, are frequency division multiplexed with the PDSCH, and can occupy different PRB pairs with the PDSCH. The multiplexing diagram of PDCCH, PDSCH and EPDCCH is shown in fig. 1.

An EPDCCH is formed by aggregating one or more Enhanced Control Channel Elements (ECCEs), and the number of ECCEs constituting the EPDCCH is represented by an aggregation level. Each ECCE consists of 4 or 8 Enhanced Resource Element Groups (EREGs for short). There are 16 EREGs per PRB pair, numbered 0-15, so there are 4 or 2 ECCEs per PRB pair. Different EREGs contain the same or different number of REs. High-level informationEach UE is configured with one or two sets of PRB pairs for EPDCCH transmission, i.e. one or two sets of PRB pairs for EPDCCH, each set of PRB pairs comprising 2, 4 or 8 PRB pairs. The EPDCCH may employ localized or distributed transmission. For localized transmission, one ECCE consists of EREGs within one PRB pair; for distributed transmission, one ECCE consists of EREGs within multiple PRB pairs. Suppose EPDCCH set X in subframe i_mIn (1), ECCE numbers of 0 to N are contained_ECCE,m,i-1, for distributed transmission, ECCE numbered N corresponds to EREG numbered within PRB indexed N, where N is_ECCE,m,iRepresenting EPDCCH set X in subframe i_mThe number of ECCEs included in the set indicates the number of EREGs included in each ECCE, the number of ECCEs included in each PRB pair indicates the number of ECCEs used for EPDCCH set X_mThe number of PRB pairs used for the EPDCCH set X_mHas an index of 0 to

Each aggregation level of EPDCCH corresponds to a search space. The search space refers to a set of EPDCCH candidates (english) that the UE needs to monitor at an aggregation level. At each aggregation level, the size of the search space is related to the number of EPDCCH candidates to be monitored at the aggregation level, and is predefined. Suppose the number of ECCEs contained in the PRB-pair set p for one EPDCCH in subframe k is N_ECCE,p,kNumbered 0 to N_ECCE,p,k-1, in the search space corresponding to the aggregation level L, the ECCE number corresponding to the EPDCCH candidate m is equal to

Wherein, Y_p,k＝(A_p·Y_p,k-1)modD，Y_p,-1＝n_RNTI≠0,A₀＝39827,A₁＝39829,D＝65537，n_sIs the number of time slots in a radio frame, n_RNTIIs the value of the radio network temporary identifier; l-1, it can be seen that the numbers of ECCEs that constitute an EPDCCH candidate are consecutive. b is equal to the value of the carrier indication field or 0. The number of the EPDCCH candidates to be monitored by the UE corresponding to the aggregation level L of the PRB pair set p. It can be seen that the minimum number of ECCEs corresponding to an EPDCCH candidate is all a multiple of L.

Next, the relevant definitions of each parameter or symbol in the formula related in the embodiment of the present invention are listed, which are specifically shown in table one:

watch 1

Finally, it should be uniformly stated that, in the following embodiments, the physical downlink control channel may specifically include an EPDCCH, and may also include an MPDCCH and the like; the control channel element may be ECCE, or may be an MTC control channel element (english: MTC CCE, abbreviated as MCCE); the resource element group may be EREG, or MTC resource element group (MTC REG, MREG for short), which is not specifically limited in each embodiment of the present invention.

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding. In some embodiments, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description with unnecessary detail. Throughout the description, the same reference numbers and the same names refer to the same or similar elements.

For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", and the like are used to distinguish the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the words "first", "second", and the like do not limit the quantity and execution order.

The invention is mainly applied to an LTE system or an LTE-A system or LTE systems of other future versions. Of course, the present invention can be applied to other communication systems as long as the communication system includes a DCI transmission device and a DCI reception device, the DCI transmission device needs to transmit DCI to the DCI reception device, and the DCI reception device needs to receive DCI transmitted by the DCI transmission device. As shown in fig. 2, the base station and the UEs 1-UE6 form a communication system, in which the base station needs to transmit DCI to the UEs 1-UE6, and the UEs 1-UE6 need to receive DCI transmitted by the base station. In addition, UE4-UE6 also form a communication system, in which UE5 needs to transmit DCI to UE4 and UE6, and UE4 and UE6 need to receive DCI transmitted by UE 5.

As can be seen from fig. 2, in the embodiment of the present invention, the sending device of DCI may be a base station or a UE, and the receiving device of DCI may be a UE, where the base station may be a NodeB or an Evolved NodeB (eNB), which is not specifically limited in this embodiment of the present invention.

Based on the above communication system, an embodiment of the present invention provides a DCI transmitting method, as shown in fig. 3, including steps S301 and S302:

s301, the DCI transmitting device determines the control channel element of one physical downlink control channel candidate in one or more physical downlink control channel candidates in the physical downlink control channel set, the control channel elements are control channel elements of control channel elements included in PRB pairs for the set of physical downlink control channels, the PRB pairs for the set of physical downlink control channels constitute a set of PRB pairs for physical downlink control channels, wherein, in subframe k, the set of PRB pairs comprises 6 PRB pairs, each control channel element consisting of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in the PRB pairs in the PRB pair set, and the first physical downlink control channel candidate is composed of the 2 control channel elements in subframe k and occupies 6 PRB pairs.

S302, the DCI transmitting apparatus transmits the DCI through the one of the physical downlink control channel candidates.

Based on the sending method of DCI provided in the embodiment of the present invention, on one hand, since the control channel elements of the physical downlink channel candidate for sending DCI determined in the embodiment of the present invention are control channel elements in the control channel elements included in the PRB pairs for the physical downlink control channel set, and the PRB pairs for the physical downlink control channel set form a PRB pair set of a physical downlink control channel, where in subframe k, the PRB pair set includes 6 PRB pairs, that is, the embodiment of the present invention provides a design scheme of only including at most 6 PRB pairs in a bandwidth for receiving and/or sending a signal, so that when an MPDCCH in the prior art adopts a design similar to an cch EPDCCH, a frequency width of a PRB pair occupied by DCI transmission exceeds a received signal bandwidth of an MTC UE due to the fact that the EPDCCH does not consider the 6 PRB pairs, and DCI transmission cannot obtain the maximum frequency diversity gain. On the other hand, in the embodiment of the present invention, 2 control channel elements exist in the control channel elements included in the PRB pair set, and the first physical downlink control channel candidate is composed of the 2 control channel elements in the subframe k and occupies 6 PRB pairs, that is, PRB pairs in which resource element groups corresponding to the control channel elements constituting the first physical downlink control channel candidate in the physical downlink control channel set are located are uniformly distributed in all PRB pairs included in the PRB pair set of the physical downlink control channel as much as possible, so that it is ensured that DCI transmission obtains a large frequency diversity gain, and the performance of DCI transmission is improved.

Further, in step S301, in the subframe k, the set X of the physical downlink control channels is used_mThe PRB index where the control channel element numbered n among the control channel elements included in the PRB pair corresponding to the resource element group numbered n is the same as an index obtained by any one of the following formulas (1) to (4), where the formulas (1) to (4) are as follows:

formula (1)

Formula (2)

Formula (3)

Formula (4)

The relevant definitions of max (a1, a2) and mod () can refer to table one, and are not described herein again.

It should be noted that the set X for the pdcch may be determined by any one of the above formulas (1) to (4)_mThe PRB pair (c) includes control channel elements numbered n corresponding to the PRB index where the resource element group numbered n is locatedHowever, the PRB index may also be determined by other formulas, as long as the formula same as the calculation result of any one of the formulas (1) to (4) above all belong to the protection scope of the embodiment of the present invention, and the embodiment of the present invention is directed to determining the set X for the physical downlink control channel_mThe specific form of the formula for the PRB index where the control channel element numbered n among the control channel elements included in the PRB pair corresponding to the resource element group numbered n is located is not particularly limited.

Exemplarily, for example, the set X for the physical downlink control channel is given by combining the above equations (1) to (4)_mThe calculation result of the PRB index where the control channel element numbered n corresponds to the resource element group numbered n among the control channel elements included in the PRB pair in (1) is shown in table two:

watch two

In table two, the numbers of the 4 resource element groups constituting one control channel element are in one-to-one correspondence with the 4 indexes of the PRBs in the table, and the resource element group is located in the PRB pair indicated by the PRB index corresponding to the number of the resource element group. For example, when the calculation formula of the PRB index is formula (1), the control channel element numbered 0 is composed of the resource element group numbered 0 in the PRB indexed 0, the resource element group numbered 4 in the PRB indexed 1, the resource element group numbered 8 in the PRB indexed 3, and the resource element group numbered 12 in the PRB indexed 4. In the second table above, the 4 resource element groups of one control channel element are in 4 PRB pairs, and the 4 PRB pairs are distributed as uniformly as possible among the 6 PRBs included in the PRB pair set of the physical downlink control channel. The 8 resource element groups of two control channel elements with continuous indexes are mapped to 6 PRB pairs, thereby ensuring that DCI transmission obtains larger frequency diversity gain and further improving the performance of the DCI transmission.

Taking the control channel element specifically being ECCE and the resource element group specifically being EREG as an example, fig. 4 illustrates that when the first pdcch candidate is formed by aggregating ECCE0 and ECCE1, that is, when the first pdcch candidate is formed by ECCE0 and ECCE1 in subframe k, the EREG and the PRB pair where the EREG is located are included in the first pdcch candidate.

Exemplarily, for example, the set X for the physical downlink control channel is given by combining the above equations (1) to (4)_mThe calculation result of the PRB index where the control channel element numbered n of the control channel elements included in the PRB pair corresponds to the resource element group numbered n is shown in table three:

watch III

In table three, the numbers of the 8 resource element groups constituting one control channel element are in one-to-one correspondence with the 8 indexes of the PRBs in the table, and the resource element group is located in the PRB pair indicated by the PRB index corresponding to the number of the resource element group. For example, when the calculation formula of the PRB index is formula (1), the control channel element numbered 0 is composed of the resource element group numbered 0 in the PRB indexed 0, the resource element group numbered 2 in the PRB indexed 1, the resource element group numbered 4 in the PRB indexed 2, the resource element group numbered 6 in the PRB indexed 3, the resource element group numbered 8 in the PRB indexed 4, the resource element group numbered 10 in the PRB indexed 5, the resource element group numbered 12 in the PRB indexed 0, and the resource element group numbered 14 in the PRB indexed 1. In table three above, 8 resource element groups of one control channel element are in 6 PRB pairs.

It should be noted that the above determination is used for the set X of the physical downlink control channels_mThe method for determining the index of the PRB where the control channel element numbered n in the control channel elements included in the PRB pair corresponds to the resource element group numbered n is not only applicable to the case where the PRB pair set includes 6 PRB pairs, but also applicable to the case where the number of PRB pairs included in the PRB pair set is other values, which is not specifically limited in this embodiment of the present invention.

Exemplarily, for example, the set X for the physical downlink control channel is given by combining the above equations (1) to (4)_mThe calculation result of the PRB index where the control channel element numbered n of the control channel elements included in the PRB pair corresponds to the resource element group numbered n is shown in table four:

watch four

In table four, the numbers of the 4 resource element groups constituting one ECCE correspond to the 4 indexes of the PRBs in the table one by one, and the resource element group is located in the PRB pair indicated by the PRB index corresponding to the number of the resource element group. For example, when the calculation formula of the PRB index is formula (1), the control channel element number 0 is composed of the resource element group number 0 in the PRB index 0, the resource element group number 4 in the PRB index 1, the resource element group number 8 in the PRB index 2, and the resource element group number 12 in the PRB index 3.

Further, as shown in fig. 5, in the embodiment of the present invention, before step S301, step S303 may further be included:

s303, the DCI transmitting apparatus determines PRB pairs in the set of PRB pairs of the physical downlink control channel.

Specifically, in a possible implementation manner, the step S303 may specifically include steps S303a-S303 b:

s303a, the DCI transmitting apparatus determines at least one of a time resource, a frequency resource, and a preamble index of the random access preamble.

S303b, the DCI sending device determines, according to a correspondence between at least one of the time resource, the frequency resource, and the preamble index of the random access preamble and a PRB pair in a PRB pair set of a physical downlink control channel, a PRB pair in the PRB pair set of the physical downlink control channel.

That is, in this implementation, the DCI transmitting apparatus may determine the PRB pairs in the PRB pair set of the physical downlink control channel in a predefined manner, where the predefined manner may be that the DCI transmitting apparatus determines one or more of a time resource, a frequency resource, and a preamble index of a random access preamble, and then determines the PRB pairs in the PRB pair set of the physical downlink control channel according to a correspondence between the one or more of the time resource, the frequency resource, and the preamble index of the random access preamble and the PRB pairs in the PRB pair set of the physical downlink control channel. Of course, the predefined manner may also be to determine PRB pairs in the PRB pair set of the physical downlink control channel according to an identifier of the UE, and the like, which is not specifically limited in this embodiment of the present invention.

In a possible implementation manner, after step S303, step S304 may further be included:

s304, the sending apparatus of DCI sends a first signaling to a receiving end, where the first signaling includes indication information of a narrowband, and a PRB pair in a set of PRB pairs of the physical downlink control channel is a PRB pair in the narrowband indicated by the first signaling.

That is, in this implementation, the DCI transmitting apparatus determines the PRB pair in the set of PRB pairs of the physical downlink control channel, and notifies the DCI receiving apparatus of the PRB pair in the set of PRB pairs of the physical downlink control channel through the first signaling, and the DCI receiving apparatus can determine the PRB pair in the set of PRB pairs of the physical downlink control channel according to the first signaling. The first signaling may specifically be one or more of radio link control common signaling, radio link control dedicated signaling, medium access control element signaling, and physical layer signaling, which is not specifically limited in this embodiment of the present invention.

In a specific implementation, the frequency resources in the system bandwidth are divided into multiple narrow bands, each narrow band includes a part of the frequency resources in the system bandwidth, and includes frequency widths of a plurality of PRBs in frequency, and the frequency width of the narrow band is not greater than a receiving and/or transmitting signal bandwidth that can be supported by the UE. The first signaling contains an indication of one or more narrow bands, which may be, for example, an information element containing a narrow band configuration, indicating a narrow band number. And if the receiving device of the DCI receives the first signaling, determining that the PRB pair in the PRB pair set of the physical downlink control channel is the PRB pair in the narrow band indicated by the first signaling. For example, the narrowband 0 includes PRB pairs with indexes 0 to 5, and the first signaling received by the receiving apparatus of DCI indicates the narrowband 0, the receiving apparatus of DCI determines that the PRB pairs in the set of PRB pairs of the physical downlink control channel are PRB pairs with indexes 0 to 5.

Further, the first signaling further includes indication information of the narrowband PRB pair, where the PRB pair indicated by the indication information of the narrowband PRB pair is a PRB pair in the set of PRB pairs of the physical downlink control channel.

That is, the first signaling may also include an indication of the PRB within the narrowband, e.g. may be an information element containing a resource block allocation within the narrowband, indicating one or more PRBs or PRB pairs contained in the narrowband. For example, if the narrowband includes a frequency width of N PRBs in frequency, the information element of the resource block allocation within the narrowband is N bits, and one state of each bit is used to indicate one PRB pair. The DCI receiving apparatus determines a PRB pair in the set of PRB pairs of the physical downlink control channel according to the narrowband configuration and the resource block allocation in the narrowband included in the first signaling. For example, the narrowband 0 includes a PRB pair whose index is 0-5, the first signaling received by the receiving apparatus of DCI indicates the narrowband 0, and the value of the information element allocated to the resource block in the narrowband is 110000, it is determined that the PRB pair in the set of PRB pairs of the physical downlink control channel is a PRB pair whose index is 0 and 1. This implementation saves the signaling overhead for the transmitting apparatus of DCI to notify the PRB pairs in the set of PRB pairs of the physical downlink control channel.

Of course, the method for configuring the PRB pairs in the PRB pair set of the physical downlink control channel by the first signaling may also be the same as the existing method for configuring the EPDCCH, and this is not specifically limited in this embodiment of the present invention.

Based on the above communication system, an embodiment of the present invention further provides a DCI sending method, as shown in fig. 6, including steps S601 and S602:

s601, a DCI transmitting device determines a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element in the control channel elements included in a PRB pair used in the physical downlink control channel set, the PRB pair used in the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in a subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes a plurality of PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, each control channel element is a control channel element included in a PRB pair in one PRB pair subset, and when the number of the control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the plurality of PRB pair subsets And when the number of the control channel elements included in the PRB pair in each of the PRB pairs is the minimum value, the control channel elements constituting the third physical downlink control channel candidate are the control channel elements included in the PRB pairs in at least two PRB pairs of the multiple PRB pairs.

S602, the sending apparatus of DCI sends the DCI through the one of the physical downlink control channel candidates.

Specifically, in the embodiment of the present invention, a PRB pair set of a physical downlink control channel is divided into a plurality of PRB pair subsets, and each PRB pair subset includes 2 or 4 PRB pairs. That is, the PRB set including 6 PRB pairs may be a subset consisting of a subset of 2 PRB pairs + a subset of 2 PRB pairs; alternatively, the PRB set including 6 PRB pairs may be a subset consisting of 4 PRB pairs + a subset consisting of 2 PRB pairs; alternatively, the PRB set including 6 PRB pairs may be a subset consisting of 2 PRB pairs and a subset consisting of 4 PRB pairs, which is not specifically limited in this embodiment of the present invention.

In the subset consisting of 2 PRB pairs and the subset consisting of 4 PRB pairs, the resource element group of which the physical downlink control channel constitutes a control channel element and the PRB pair in which the resource element group of which the physical downlink control channel constitutes a control channel element is located are the same as the EPDCCH, and details are not repeated here.

Based on the sending method of DCI provided in the embodiment of the present invention, on one hand, since the control channel elements of the physical downlink channel candidate for sending DCI determined in the embodiment of the present invention are control channel elements in the control channel elements included in the PRB pairs used for the physical downlink control channel set, and the PRB pairs used for the physical downlink control channel set form a PRB pair set of a physical downlink control channel, where in a subframe k, the PRB pair set includes 6 PRB pairs, that is, the embodiment of the present invention provides a design scheme of only including at most 6 PRB pairs in a bandwidth for receiving and/or sending a signal, so that when an MPDCCH in the prior art adopts a design similar to an cch EPDCCH, a problem that a frequency width of a PRB pair occupied by DCI transmission exceeds a receiving signal bandwidth of an mtcc ue due to the fact that the EPDCCH design does not consider 6 PRB pairs is solved, and DCI transmission cannot obtain the maximum frequency diversity gain. On the other hand, in the embodiment of the present invention, when the number of the control channel elements constituting the third physical downlink control channel candidate in the physical downlink control channel set is greater than 1 and is not greater than the minimum value of the number of the control channel elements included in the PRB pair in each subset of the plurality of PRB pair subsets, the control channel elements constituting the third physical downlink control channel candidate are control channel elements of the control channel elements comprised by PRB pairs of at least two of the plurality of PRB pairs, that is, the PRB pairs in which the resource element groups corresponding to the control channel elements in the third physical downlink control channel candidate are located are distributed as uniformly as possible in all the PRB pairs contained in the PRB pair set of the physical downlink control channel, therefore, the DCI transmission can be ensured to obtain larger frequency diversity gain, and the DCI transmission performance is improved.

Further, in step S601, in a possible implementation manner, the numbers of the control channel elements included in the PRB pairs in the PRB pair set are obtained by interleaving and numbering the control channel elements included in the PRB pairs in the multiple PRB pair sets in the PRB pair set.

That is, when numbering the control channel elements included in a PRB pair set in this implementation, the control channel elements in different PRB pairs are not sequentially numbered, that is, after all the control channel elements in one PRB pair subset are numbered first, the control channel elements in another PRB pair subset are numbered again until the control channel elements included in the PRB pair set are numbered completely. Instead, the control channel elements included in the PRB pairs in the multiple PRB pair subsets in the PRB pair set are interleaved, that is, assuming that the PRB pair set includes S PRB pair subsets, which are PRB pair subset 0, PRB pair subset 1, … …, and PRB pair subset S-1, then numbering the partial control channel elements in the PRB pair subset 0 first, and then numbering the partial control channel elements in the PRB pair subset 1, … …, after numbering the partial control channel elements in the PRB pair subset S-1, then numbering the partial control channel elements in the PRB pair subset 0 and the partial control channel elements in the PRB pair subset 1 sequentially, and … … until the control channel elements included in the PRB pairs in the PRB pair set are numbered completely.

Preferably, the PRB pair set includes PRB pair subset 0, PRB pair subsets 1 and … …, and PRB pair subset S-1, which are S PRB pair subsets, and the ratio of the number of PRB pairs respectively included in the S PRB pair subsets is X₀：X₁：……X_S-1。

The above-mentioned manner of interleaving and numbering the control channel elements included in the PRB pairs of the plurality of PRB pair subsets is described below with reference to two specific examples.

For example, when there are 6 PRB pairs in the set of PRB pairs of the physical downlink control channel, the PRB pair subset consisting of 2 PRB pairs is divided into PRB pair subset 1+4 PRB pair subset 2, and the physical downlink control channel adopts distributed transmission, the numbers of 24 control channel elements in the 6 PRB pairs, the resource element group numbers of the control channel elements, and the PRB indexes where the resource element groups of the control channel elements are located are shown in the following table five:

watch five

In table five, the numbers of the 4 resource element groups constituting one control channel element are in one-to-one correspondence with the 4 indexes of the PRBs in the table, and the resource element group is located in the PRB pair indicated by the PRB index corresponding to the number of the resource element group. For example, the control channel element numbered 0 is composed of the resource element group numbered 0 in the PRB indexed 0, the resource element group numbered 4 in the PRB indexed 1, the resource element group numbered 8 in the PRB indexed 0, and the resource element group numbered 12 in the PRB indexed 1, and the PRB pair in which it is located is the PRB pair in the PRB pair subset 1.

If the physical downlink control channel candidate consists of 8 control channel elements, 24 control channel elements in 6 PRB pairs may constitute 3 third physical downlink control channel candidates according to the above-mentioned existing calculation method of ECCEs constituting the EPDCCH candidate. For example, the control channel element numbers constituting the third physical downlink control channel candidate 1 are 0 to 7, the control channel element numbers constituting the third physical downlink control channel candidate 2 are 8 to 15, and the control channel element numbers constituting the third physical downlink control channel candidate 3 are 16 to 23. Wherein, the third physical downlink control channel candidate 1, the third physical downlink control channel candidate 2, and the third physical downlink control channel candidate 3 all occupy 6 PRB pairs, and assuming that the control channel element is specifically ECCE, a distribution diagram of the third physical downlink control channel candidate 1, the third physical downlink control channel candidate 2, and the third physical downlink control channel candidate 3 is shown in fig. 7.

If the physical downlink control channel consists of 2 control channel elements, 24 control channel elements in 6 PRB pairs may constitute 12 third physical downlink control channel candidates according to the above-mentioned existing ECCE calculation method for constituting an EPDCCH candidate. And as can be seen from table five, there is a third physical downlink control channel candidate occupying 6 PRB pairs, for example, a third physical downlink control channel candidate composed of control channel element 0 and control channel element 1. Of course, there is also a third physical downlink control channel candidate occupying 4 PRB pairs, such as a third physical downlink control channel candidate consisting of control channel element 4 and control channel element 5.

Or, for example, when there are 6 PRB pairs in the set of PRB pairs of the physical downlink control channel, the PRB pair subset consisting of 2 PRB pairs is divided into the PRB pair subset 1+2 PRB pair subset 2+2 PRB pair subset 3, and the physical downlink control channel adopts distributed transmission, the numbers of 24 control channel elements in the 6 PRB pairs, the resource element group numbers of the control channel elements, and the index of the PRB where the resource element group of the control channel elements is located are shown in the following table six:

watch six

In table six, the numbers of the 4 resource element groups constituting one control channel element are in one-to-one correspondence with the 4 indexes of the PRBs in the table, and the resource element group is located in the PRB pair indicated by the PRB index corresponding to its number. For example, the control channel element numbered 0 is composed of the resource element group numbered 0 in the PRB indexed 0, the resource element group numbered 4 in the PRB indexed 1, the resource element group numbered 8 in the PRB indexed 0, and the resource element group numbered 12 in the PRB indexed 1, and the PRB pair in which it is located is the PRB pair in the PRB pair subset 1.

If the physical downlink control channel consists of 8 control channel elements, 24 control channel elements in 6 PRB pairs may constitute 3 third physical downlink control channel candidates according to the above-mentioned existing method for calculating ECCEs constituting EPDCCH candidates. For example, the control channel element numbers constituting the third physical downlink control channel candidate 1 are 0 to 7, the control channel element numbers constituting the third physical downlink control channel candidate 2 are 8 to 15, and the control channel element numbers constituting the third physical downlink control channel candidate 3 are 16 to 23. Wherein, the third physical downlink control channel candidate 1, the third physical downlink control channel candidate 2, and the third physical downlink control channel candidate 3 all occupy 6 PRB pairs, and assuming that the control channel element is specifically ECCE, the distribution schematic diagram of the third physical downlink control channel candidate 1, the third physical downlink control channel candidate 2, and the third physical downlink control channel candidate 3 is shown in fig. 8.

If the physical downlink control channel consists of 2 control channel elements, 24 control channel elements in 6 PRB pairs may constitute 12 third physical downlink control channel candidates according to the above-mentioned existing EPDCCH candidate calculation method. And according to table five, all the third physical downlink control channel candidates occupy 4 PRB pairs.

Or, for example, when there are 6 PRB pairs in the set of PRB pairs of the physical downlink control channel, the PRB pair subset consisting of 2 PRB pairs is divided into the PRB pair subset 1+2 PRB pair subset 2+2 PRB pair subset 3, and the physical downlink control channel adopts distributed transmission, the numbers of 12 control channel elements in the 6 PRB pairs, the resource element group numbers of the control channel elements, and the PRB indexes where the resource element groups of the control channel elements are located are shown in the following table seven:

watch seven

In table seven, the numbers of the 8 resource element groups constituting one control channel element are in one-to-one correspondence with the 8 indexes of the PRBs in the table, and the resource element group is located in the PRB pair indicated by the PRB index corresponding to the number of the resource element group. For example, the control channel element numbered 0 is composed of the resource element group numbered 0 in the PRB indexed 0, the resource element group numbered 2 in the PRB indexed 1, the resource element group numbered 4 in the PRB indexed 0, the resource element group numbered 6 in the PRB indexed 1, the resource element group numbered 8 in the PRB indexed 0, the resource element group numbered 10 in the PRB indexed 1, the resource element group numbered 12 in the PRB indexed 0, and the resource element group numbered 14 in the PRB indexed 1, and the PRB pair in which it is located is the PRB pair in the PRB pair subset 1.

If the physical downlink control channel consists of 4 control channel elements, according to the above-mentioned existing calculation method of ECCEs constituting EPDCCH candidates, 12 control channel elements in 6 PRB pairs may constitute 3 third physical downlink control channel candidates in total. For example, the control channel element numbers constituting the third physical downlink control channel candidate 1 are 0 to 3, the control channel element numbers constituting the third physical downlink control channel candidate 2 are 4 to 7, and the control channel element numbers constituting the third physical downlink control channel candidate 3 are 8 to 11. Wherein, the third physical downlink control channel candidate 1, the third physical downlink control channel candidate 2, and the third physical downlink control channel candidate 3 occupy 6 PRB pairs of the 3 PRB pair subsets, respectively.

In another possible implementation manner, the control channel elements constituting the third physical downlink control channel candidate are discontinuous control channel elements.

Specifically, in this implementation, the manner of numbering the control channel elements included in the PRB pairs in the PRB pair set is to sequentially number the control channel elements in different PRB subsets, that is, after all the control channel elements in one PRB subset are numbered, the control channel elements in another PRB subset are numbered until the control channel elements included in the PRB pairs in the PRB pair set are numbered. However, the determination method of the ECCE constituting the third physical downlink control channel candidate is different from the related art. That is, the numbers of the control channel elements constituting the third physical downlink control channel candidate may not be consecutive, and/or the minimum number of the control channel elements constituting the third physical downlink control channel candidate may not be a multiple of the aggregation level L.

Illustratively, when there are 6 PRB pairs in the set of PRB pairs of the physical downlink control channel, the PRB pairs are divided into a PRB pair subset consisting of 2 PRB pairs 1+4 PRB pair subset 2, and the physical downlink control channel adopts distributed transmission, the numbers of 24 control channel elements in the 6 PRB pairs, the resource element group numbers of the control channel elements, and the PRB indexes where the resource element groups of the control channel elements are located are shown in table eight below:

table eight

If the physical downlink control channel consists of 8 control channel elements, 24 control channel elements in 6 PRB pairs may constitute 3 third physical downlink control channel candidates, the number of the control channel element constituting the third physical downlink control channel candidate 1 is 0,1,2,8,9,10,11,12, the number of the control channel element constituting the third physical downlink control channel candidate 2 is 3,4,5,13,14,15,16,17, and the number of the control channel element constituting the third physical downlink control channel candidate 3 is 6,7,18,19,20,21,22, 23. As can be seen, the third physical downlink control channel candidate 1, the third physical downlink control channel candidate 2, and the third physical downlink control channel candidate 3 occupy 6 PRB pairs respectively.

As can be seen from the examples in table five-table eight, in the embodiment of the present invention, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in the PRB pair in each of the plurality of PRB pairs, the control channel element constituting the third physical downlink control channel candidate is a control channel element in the control channel elements included in the PRB pairs in at least two PRB pairs in the plurality of PRB pairs. Therefore, the DCI transmission can be ensured to obtain larger frequency diversity gain, and the performance of the DCI transmission is further improved.

Further, as shown in fig. 9, before step S601, the method may further include:

s603, the DCI transmitting apparatus determines PRB pairs included in a plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel.

Specifically, in a possible implementation manner, after step S603, step S604 may further be included:

and S604, the DCI sending device sends a second signaling to a receiving end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S represents the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer.

That is, in this implementation, the DCI transmitting apparatus determines the PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel, and notifies the DCI receiving apparatus of the PRB pairs included in the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel through the second signaling, and the DCI receiving apparatus can determine the PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling and the determined PRB pairs in the PRB pair set of the physical downlink control channel. The second signaling may specifically be one or more of radio link control common signaling, radio link control dedicated signaling, medium access control element signaling, and physical layer signaling, which is not specifically limited in this embodiment of the present invention.

In another possible implementation manner, the step S603 may specifically include steps S603b-S603 c:

s603b, the sending apparatus of DCI determines PRB pairs in the set of PRB pairs of the pdcch.

Specifically, the manner in which the DCI transmitting apparatus determines the PRB pairs in the PRB pair set of the physical downlink control channel is described in step S303, and details of the embodiment of the present invention are not repeated here.

S603c, the sending apparatus of DCI determines, according to the PRB pairs in the set of PRB pairs of the physical downlink control channel, the PRB pairs included in the plurality of sets of PRB pairs in the set of PRB pairs of the physical downlink control channel in combination with a second preset rule.

That is, in this implementation, the DCI transmitting apparatus first determines PRB pairs in the set of PRB pairs of the physical downlink control channel, and then determines PRB pairs included in the plurality of sets of PRB pairs in the set of PRB pairs of the physical downlink control channel according to a second preset rule. The second preset rule may be that the number of the PRB pair subsets is S, the number of the PRB pairs included in each PRB pair subset is preset, and in the PRB pair set of the physical downlink control channel, starting from the PRB pair with the smallest number, the number is increased progressively, and all the PRB pairs in the PRB pair subset 0, all the PRB pairs in the PRB pair subset 1, … …, and all the PRB pairs in the PRB pair subset S-1 are sequentially selected. For example, the PRB pair set of the physical downlink control channel has 6 PRB pairs in total, the number is 0-5, and the PRB pair set is divided into a subset 0 including 2 PRB pairs and a subset 1 including 4 PRB pairs, then the PRB pair subset 0 includes PRB pairs with the numbers 0 and 1, and the PRB pair subset 1 includes PRB pairs with the numbers 2-5. The second preset rule may also be that the number of the PRB pair subsets is S and the number of PRB pairs included in each PRB pair subset are preset, and in the set of PRB pairs of the physical downlink control channel, starting from the PRB pair with the smallest number, each PRB pair with an increasing number is selected, and the PRB pairs in the PRB pair subset 0, the PRB pairs in the PRB pair subset 1, … …, the PRB pairs in the PRB pair subset S-1, the PRB pairs in the PRB pair subset 0, the PRB pairs in the PRB pair subset 1, and … … are sequentially used, and until the number of PRB pairs in a certain PRB pair subset reaches a preset value, the selection of PRB pairs included in the PRB pair subset is stopped. For example, there are 6 PRB pairs in the PRB pair set of the physical downlink control channel, the number is 0-5, and the PRB pair subset 0 includes 2 PRB pairs, the subset 1 includes 2 PRB pairs, and the subset 2 includes 2 PRB pairs, then the PRB pair subset 0 includes PRB pairs with numbers 0 and 3, the PRB pair subset 1 includes PRB pairs with numbers 1 and 4, and the PRB pair subset 1 includes PRB pairs with numbers 2 and 5. This implementation saves the signaling overhead for the transmitting apparatus of DCI to inform the PRB pairs contained in each PRB pair subset.

In another possible implementation manner, after step S603, step S607 may further be included:

s607, the DCI transmitting apparatus transmits a third signaling to a receiving end, where the third signaling is used to indicate the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel.

That is, in this implementation, the DCI transmitting apparatus determines the PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel, and notifies the DCI receiving apparatus of the PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel through the third signaling, and the DCI receiving apparatus can determine the PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling. The third signaling may specifically be one or more of radio link control common signaling, radio link control dedicated signaling, medium access control element signaling, and physical layer signaling, which is not specifically limited in this embodiment of the present invention. For example, the information elements included in the third signaling include resource block allocation of set 0, resource block allocation of set 1, and resource block allocation of set S-1 of … …, which are respectively used to configure PRB pairs included in each of the S PRB pairs.

The above is only an exemplary manner for the transmitting apparatus providing several DCI to determine the PRB pairs included in the multiple PRB pair subsets in the PRB pair set of the physical downlink control channel, and of course, there may be other possible implementation manners, and details of the embodiment of the present invention are not described herein again.

Based on the above communication system, an embodiment of the present invention provides a DCI receiving method, as shown in fig. 10, including steps S1001 and S1002:

s1001, a receiving device of DCI determines a control channel element of one physical downlink control channel candidate in one or more physical downlink control channel candidates in a physical downlink control channel set, the control channel elements are control channel elements of control channel elements included in PRB pairs for the set of physical downlink control channels, the PRB pairs for the set of physical downlink control channels constitute a set of PRB pairs for physical downlink control channels, wherein, in subframe k, the set of PRB pairs comprises 6 PRB pairs, each control channel element consisting of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in the PRB pairs in the PRB pair set, and the first physical downlink control channel candidate is composed of the 2 control channel elements in subframe k and occupies 6 PRB pairs.

S1002, the DCI receiving apparatus receives the DCI through the one of the physical downlink control channel candidates.

Based on the receiving method of DCI provided in the embodiment of the present invention, on one hand, since the control channel elements of the physical downlink channel candidates for receiving DCI determined in the embodiment of the present invention are control channel elements in the control channel elements included in the PRB pairs used in the physical downlink control channel set, and the PRB pairs used in the physical downlink control channel set form a PRB pair set of a physical downlink control channel, where in subframe k, the PRB pair set includes 6 PRB pairs, that is, the embodiment of the present invention provides a design scheme for only including at most 6 PRB pairs in a bandwidth for receiving and/or transmitting a signal, so that when an MPDCCH in the prior art adopts a design similar to an cch EPDCCH, a frequency width of a PRB pair occupied by DCI transmission exceeds a received signal bandwidth of an MTC UE, and DCI transmission cannot obtain the maximum frequency diversity gain. On the other hand, in the embodiment of the present invention, 2 control channel elements exist in the control channel elements included in the PRB pair set, and the first physical downlink control channel candidate is composed of the 2 control channel elements in the subframe k and occupies 6 PRB pairs, that is, PRB pairs in which resource element groups corresponding to the control channel elements constituting the first physical downlink control channel candidate in the physical downlink control channel set are located are uniformly distributed in all PRB pairs included in the PRB pair set of the physical downlink control channel as much as possible, so that it is ensured that DCI transmission obtains a large frequency diversity gain, and the performance of DCI transmission is improved.

Further, in step S1001, in the subframe k, the method is used for the set X of the physical downlink control channels_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element in the control channel elements included in the PRB pair is the same as an index obtained by any one of the following formulas (1) to (4), where the formulas (1) to (4) are shown in the above embodiments and are not described herein again.

It should be noted that the set X for the pdcch may be determined by any one of the above formulas (1) to (4)_mThe PRB index corresponding to the numbered resource element group in the control channel element included in the PRB pair is n, and of course, the PRB index may also be determined by other formulas, as long as the formula same as the calculation result of any one of the formulas (1) to (4) above all belongs to the protection scope of the embodiment of the present invention, and the embodiment of the present invention is used for determining the set X for the physical downlink control channel_mThe specific form of the formula for the PRB index where the control channel element numbered n among the control channel elements included in the PRB pair corresponding to the resource element group numbered n is located is not particularly limited.

For related examples, reference may be made to examples shown in tables two to four, which are not described herein again.

Further, as shown in fig. 11, in the embodiment of the present invention, before step S1001, step S1003 may further be included:

s1003, the receiving apparatus of DCI determines PRB pairs in the set of PRB pairs of the physical downlink control channel.

Specifically, in a possible implementation manner, the step S1003 may specifically include steps S1003a-S1003 b:

s1003a, the receiving apparatus of DCI determines at least one of a time resource, a frequency resource, and a preamble index of the random access preamble.

S1003b, determining, by the DCI receiving apparatus, a PRB pair in the PRB pair set of the physical downlink control channel according to a correspondence between at least one of the time resource, the frequency resource, and the preamble index of the random access preamble and a PRB pair in the PRB pair set of the physical downlink control channel.

That is, in this implementation, the receiving apparatus of the DCI may determine the PRB pairs in the set of PRB pairs of the physical downlink control channel in a predefined manner, where the predefined manner may be that the receiving apparatus of the DCI determines one or more of a time resource, a frequency resource, and a preamble index of a random access preamble, and then determines the PRB pairs in the set of PRB pairs of the physical downlink control channel according to a correspondence between the one or more of the time resource, the frequency resource, and the preamble index of the random access preamble and the PRB pairs in the set of PRB pairs of the physical downlink control channel. Of course, the predefined manner may also be to determine PRB pairs in the PRB pair set of the physical downlink control channel according to an identifier of the UE, and the like, which is not specifically limited in this embodiment of the present invention.

In a possible implementation manner, before the step S1003, the method may further include the step S1005:

s1005, the receiving apparatus of DCI receives a first signaling sent by a sending end, where the first signaling includes narrowband indication information, and a PRB pair in a PRB pair set of the physical downlink control channel is a PRB pair in the narrowband indicated by the first signaling.

Step S1003 specifically includes step S1003 a:

s1003a, the receiving apparatus of DCI determines, according to the first signaling, a PRB pair in the set of PRB pairs of the physical downlink control channel.

Based on the above communication system, an embodiment of the present invention further provides a DCI receiving method, as shown in fig. 12, including steps S1201 and S1202:

s1201, a receiving device of DCI determines a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element in the control channel elements included in a PRB pair used in the physical downlink control channel set, the PRB pair used in the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes a plurality of PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, each control channel element is a control channel element included in a PRB pair in one PRB pair subset, and when the number of the control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the plurality of PRB pair subsets And when the number of the control channel elements included in the PRB pair in each of the PRB pairs is the minimum value, the control channel elements constituting the third physical downlink control channel candidate are the control channel elements included in the PRB pairs in at least two PRB pairs of the multiple PRB pairs.

S1202, the DCI receiving apparatus receives the DCI through the one of the physical downlink control channel candidates.

Based on the receiving method of DCI provided in the embodiment of the present invention, on one hand, since the control channel elements of the physical downlink channel candidates for receiving DCI determined in the embodiment of the present invention are control channel elements in the control channel elements included in the PRB pairs used in the physical downlink control channel set, and the PRB pairs used in the physical downlink control channel set form a PRB pair set of a physical downlink control channel, where in subframe k, the PRB pair set includes 6 PRB pairs, that is, the embodiment of the present invention provides a design scheme for only including at most 6 PRB pairs in a bandwidth for receiving and/or transmitting a signal, so that when an MPDCCH in the prior art adopts a design similar to an cch EPDCCH, a frequency width of a PRB pair occupied by DCI transmission exceeds a received signal bandwidth of an MTC UE, and DCI transmission cannot obtain the maximum frequency diversity gain. On the other hand, in the embodiment of the present invention, when the number of the control channel elements constituting the third physical downlink control channel candidate in the physical downlink control channel set is greater than 1 and is not greater than the minimum value of the number of the control channel elements included in the PRB pair in each subset of the plurality of PRB pair subsets, the control channel elements constituting the third physical downlink control channel candidate are control channel elements of the control channel elements comprised by PRB pairs of at least two of the plurality of PRB pairs, that is, the PRB pairs in which the resource element groups corresponding to the control channel elements in the third physical downlink control channel candidate are located are distributed as uniformly as possible in all the PRB pairs contained in the PRB pair set of the physical downlink control channel, therefore, the DCI transmission can be ensured to obtain larger frequency diversity gain, and the DCI transmission performance is improved.

Further, in step S1201, in a possible implementation manner, the numbers of the control channel elements included in the PRB pairs in the PRB pair set are obtained by interleaving and numbering the control channel elements included in the PRB pairs in the multiple PRB pair sets in the PRB pair set.

Preferably, the set of PRB pairs includes PRB pair sets 0 and PThe RB pair subsets 1 and … … and the PRB pair subset S-1 share S PRB pair subsets, and the proportion of the number of the PRB pairs contained in the S PRB pair subsets is X₀：X₁：……X_S-1。

For related examples, reference may be made to examples shown in tables five to seven, which are not described herein again.

For related examples, reference may be made to the example shown in table eight, which is not described herein again.

Further, as shown in fig. 13, before step S1201, the method may further include:

s1203, the receiving apparatus of DCI determines PRB pairs included in a plurality of PRB pair subsets in a set of PRB pairs of a physical downlink control channel.

Specifically, in a possible implementation manner, before the step S1203, steps S1205-S1206 may further be included:

s1205, the DCI receiving apparatus determines a PRB pair in the set of PRB pairs of the physical downlink control channel.

Specifically, the manner in which the DCI receiving apparatus determines the PRB pairs in the PRB pair set of the physical downlink control channel is described in step S303, and details of the embodiment of the present invention are not repeated here.

S1206, the DCI receiving apparatus receives a second signaling sent by a sending end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S denotes the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer.

Step S1203 specifically includes step S1203 a:

s1203a, the DCI receiving apparatus determines, according to the PRB pair in the PRB pair set of the physical downlink control channel and the second signaling, a PRB pair included in the plurality of PRB pair sets in the PRB pair set of the physical downlink control channel.

In a specific implementation, when T is equal to 1, step S1203a may specifically include step S1203a1 and step S1203a 2:

s1203a1, the receiving apparatus of DCI determines, according to the second signaling, PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel.

S1203a2, the receiving apparatus of DCI determines that the PRB pairs included in the complementary set of the S-T PRB pair subsets in the set of PRB pairs of the physical downlink control channel are PRB pairs included in the remaining T PRB pair subsets in the set of PRB pairs of the physical downlink control channel.

For example, if the PRB pair set of the physical downlink control channel includes M PRB pairs in total, when the number of the PRB pair subsets is 2, the second signaling includes M bits, where one state of each bit is used to indicate that one PRB pair is a PRB pair in one of the subsets, and a PRB pair in the other subset is the remaining PRB pair. For example, the PRB pair set of the physical downlink control channel has 6 PRB pairs in total, the number is 0 to 5, the PRB pairs are divided into subsets of 2 PRB pairs, and the indication of the PRB pair included in one of the PRB pair subsets of the second signaling pair received by the receiving apparatus of the DCI is 110000, then the receiving apparatus of the DCI determines that the numbers of the PRB pairs included in the two PRB pair subsets are 0 to 1 and 2 to 5, respectively. This implementation saves the signaling overhead for the transmitting apparatus of DCI to inform the PRB pairs contained in each PRB pair subset.

When T >1, the step S1203a may specifically include steps S1203a3-S1203a 5:

s1203a3, the receiving apparatus of DCI determines, according to the second signaling, PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel.

And S1203a4, determining, by the receiving apparatus of the DCI, the PRB pairs included in the T-1 PRB subsets except the S-T PRB subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs included in the S-T PRB subsets, in combination with a first preset rule.

S1203a5, the receiving apparatus of DCI determines that the PRB pairs included in the S-T PRB pair subsets and the complementary set of the T-1 PRB pair subsets in the set of PRB pairs of the physical downlink control channel are PRB pairs included in the remaining 1 PRB pair subsets in the set of PRB pairs of the physical downlink control channel.

Illustratively, the number of PRB pairs included in each subset of the T-1 PRB pairs is predefined. The first preset rule is that, in the remaining PRB pairs included in the PRB pair set of the physical downlink control channel except the PRB pairs included in the S-T PRB pair subsets, the numbers are increased from the PRB pair with the smallest number, and all PRB pairs included in each subset of the T-1 PRB pair subsets are sequentially selected according to the number of PRB pairs included in each subset of the T-1 PRB pair subsets specified in advance. If the PRB pair set of the pdcch includes M PRB pairs, when the number of the PRB pair subsets is 3, the second signaling includes M bits, where one state of each bit is used to indicate that one PRB pair is a PRB pair in one of the subsets, and the PRB pairs in the other two subsets are the remaining PRB pairs. For example, the PRB pair set of the physical downlink control channel has 6 PRB pairs in common, the number is 0 to 5, the PRB pairs are divided into subsets of S ═ 3 PRB pairs, T ═ 2, and the indication of the PRB pair included in one PRB pair subset of the second signaling pair received by the receiving apparatus of the DCI is 100100, then the receiving apparatus of the DCI determines that the numbers of the PRB pairs included in this PRB pair subset are 0 and 3, and the numbers of the remaining PRB pairs are 1,2, 4, and 5. According to a first preset rule, it is predefined that if the number of PRB pairs included in one of the remaining two PRB pair subsets is 2, the number of PRB pairs included in this subset is 1 or 2, and the number of PRB pairs included in the other of the remaining two PRB pair subsets is 4 or 5. This implementation saves the signaling overhead for the transmitting apparatus of DCI to inform the PRB pairs contained in each PRB pair subset.

In another possible implementation manner, the step S1203 may specifically include steps S1203b-S1203 c:

s1203b, the receiving apparatus of DCI determines a PRB pair in the set of PRB pairs of the physical downlink control channel.

S1203c, determining, by the receiving apparatus of the DCI, PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel according to PRB pairs in the PRB pair set of the physical downlink control channel in combination with a second preset rule.

That is, in this implementation, the DCI receiving apparatus first determines PRB pairs in the PRB pair set of the physical downlink control channel, and then determines PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel according to a second preset rule. The second preset rule may be that the number of the PRB pair subsets is S, the number of the PRB pairs included in each PRB pair subset is preset, and in the PRB pair set of the physical downlink control channel, starting from the PRB pair with the smallest number, the number is increased progressively, and all the PRB pairs in the PRB pair subset 0, all the PRB pairs in the PRB pair subset 1, … …, and all the PRB pairs in the PRB pair subset S-1 are sequentially selected. For example, the PRB pair set of the physical downlink control channel has 6 PRB pairs in total, the number is 0-5, and the PRB pair set is divided into a subset 0 including 2 PRB pairs and a subset 1 including 4 PRB pairs, then the PRB pair subset 0 includes PRB pairs with the numbers 0 and 1, and the PRB pair subset 1 includes PRB pairs with the numbers 2-5. The second preset rule may also be that the number of the PRB pair subsets is S and the number of PRB pairs included in each PRB pair subset are preset, and in the set of PRB pairs of the physical downlink control channel, starting from the PRB pair with the smallest number, each PRB pair with an increasing number is selected, and the PRB pairs in the PRB pair subset 0, the PRB pairs in the PRB pair subset 1, … …, the PRB pairs in the PRB pair subset S-1, the PRB pairs in the PRB pair subset 0, the PRB pairs in the PRB pair subset 1, and … … are sequentially used, and until the number of PRB pairs in a certain PRB pair subset reaches a preset value, the selection of PRB pairs included in the PRB pair subset is stopped. For example, there are 6 PRB pairs in the PRB pair set of the physical downlink control channel, the number is 0-5, and the PRB pair subset 0 includes 2 PRB pairs, the subset 1 includes 2 PRB pairs, and the subset 2 includes 2 PRB pairs, then the PRB pair subset 0 includes PRB pairs with numbers 0 and 3, the PRB pair subset 1 includes PRB pairs with numbers 1 and 4, and the PRB pair subset 1 includes PRB pairs with numbers 2 and 5. This implementation saves the signaling overhead for the transmitting apparatus of DCI to inform the PRB pairs contained in each PRB pair subset.

In yet another possible implementation manner, before the step S1203, the method may further include the step S1208:

s1208, the DCI receiving apparatus receives a third signaling sent by a sending end, where the third signaling is used to indicate the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel.

Step S1203 may specifically include step S1203 d:

s603d, the DCI receiving device determines, according to the third signaling, PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel.

The above is only an exemplary manner for the receiving apparatus providing several DCI to determine the PRB pairs included in the multiple PRB pair subsets in the PRB pair set of the physical downlink control channel, and of course, there may be other possible implementation manners, and details of the embodiment of the present invention are not described herein again.

Further, in the embodiments shown in fig. 3, 6, 10 and 12, in the subframe k, the number of control channel elements included in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second/fourth physical downlink control channel candidate, and the control channel elements composing the second/fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

That is, in the embodiment of the present invention, N is referred to_CCE,p,kCan not be covered with L_kUnder the condition of integer division, a composition mode of physical downlink control channel candidates is provided. In this scheme, there is a certain physical downlink control channel candidate, and in subframe k, the control channel element of this physical downlink control channel candidate includes the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

In a possible implementation manner, in subframe k, the number of a control channel element corresponding to the mth physical downlink control channel candidate in the physical downlink control channel candidates is as shown in formula (5):

formula (5)

Wherein, Y_p,kstartThe method is calculated according to a predefined functional relationship, wherein the predefined functional relationship is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located. Illustratively, the predefined functional relationship is Y_p,kstart＝(A_p·Y_p,kstart-1)mod D，Y_p,-1＝n_RNTI≠0,A₀＝39827,A₁＝39829,D＝65537，n_RNTIIs the value of the radio network temporary identifier, kstart is the subframe number of the starting subframe of one or more subframes where the physical downlink control channel candidate is located, n is the subframe number of the starting subframe of the one or more subframes where the physical downlink control channel candidate is located_{s_start}Is the sequence number of the first time slot or the sequence number of the second time slot of the starting sub-frame of one or more sub-frames where the physical downlink control channel candidate is located. b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; mod () is defined with reference to table one and will not be described herein. In one possible implementation, the maximum is

Illustratively, the number of control channel elements included in the PRB pair set for the physical downlink control channel in subframe k is 24, that is, N_CCE,p,kNumber 24, 0-23. The 16 control channel elements in the subframe k are control channel elements in one physical downlink control channel candidate, i.e., L_k16. Maximum admissible hypothesis Y_p,kstart0 and b is 0, according to the above formula (5), the control channel element number corresponding to the 0 th physical downlink control channel candidate in the subframe k is 0-15, and the control channel element corresponding to the 1 st physical downlink control channel candidate in the subframe k is 0The element numbers are 16-23 and 0-7, the 1 st physical downlink control channel candidate in this example is the second/fourth physical downlink control channel candidate mentioned above, in this case, L_k1＝16。

Since the embodiment of the invention is directed to N_CCE,p,kCan not be covered with L_kUnder the condition of integer division, a composition mode of physical downlink control channel candidates is provided, so N_CCE,p,kThe control channel elements can form more physical downlink control channel candidates, so that the flexibility of resources occupied by DCI transmission is improved, and the probability of mutual blocking of DCIs of different UEs is reduced.

Corresponding to the above DCI transmission method embodiment, an embodiment of the present invention further provides a DCI transmission apparatus 140, and as shown in fig. 14, the DCI transmission apparatus 140 includes: a determination unit 1401 and a transmission unit 1402.

The determining unit 1401 is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, and the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, where, in a subframe k, the PRB pair set includes 6 PRB pairs, each control channel element is composed of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements in the subframe k and occupies 6 A PRB pair.

The sending unit 1402 is configured to send the DCI through the one of the physical downlink control channel candidates.

Further, in the subframe k, the method is used for the physical downlink control channel set X_mThe PRB pair(s) of (1) includes a control channel element numbered n corresponding to the PRB index at which the resource element group numbered n is locatedThe indexes obtained by any one of the following first to fourth formulas are the same, wherein the first to fourth formulas are respectively the above formulas (1) to (4).

Further, in the subframe k, the number of control channel elements included in PRB pairs in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

Preferably, the control channel element number corresponding to the mth physical downlink control channel candidate among the physical downlink control channel candidates is

Specifically, as described above, the DCI transmitting apparatus 140 according to the embodiment of the present invention may be a base station or a UE, which is not specifically limited in this embodiment of the present invention.

Specifically, in the embodiment of the DCI transmitting apparatus 140 shown in fig. 14, the determining unit 1401 may be implemented by a processor, and the transmitting unit 1402 may be implemented by a transmitter, where the transmitter and the processor may communicate with each other, and this is not specifically limited in this embodiment of the present invention.

Specifically, the method for transmitting DCI by the DCI transmitting device 140 according to the embodiment of the present invention may refer to the foregoing method embodiment, and the embodiment of the present invention is not described herein again.

Since the DCI transmitting apparatus 140 according to the embodiment of the present invention can be used to perform the DCI transmitting method, the technical effect that can be obtained by the DCI transmitting apparatus 140 according to the embodiment of the present invention can also refer to the method embodiment, which is not described herein again.

The determining unit 1401 is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes multiple PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, and each control channel element is a control channel element included in a PRB pair in one PRB pair subset, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in PRB pairs in each of the plurality of PRB pairs, the control channel elements constituting the third physical downlink control channel candidate are control channel elements among the control channel elements included in PRB pairs in at least two PRB pairs of the plurality of PRB pairs.

In one possible implementation manner, as shown in fig. 15, the DCI transmitting apparatus 140 further includes a numbering unit 1403.

The numbers of the control channel elements included in the PRB pairs in the PRB pair set are obtained by interleaving and numbering the control channel elements included in the PRB pairs in the plurality of PRB pair subsets in the PRB pair set by the numbering unit 1403.

The numbering unit 1403 is specifically configured to:

Further, in the subframe k, the number of control channel elements included in PRB pairs in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

In another possible implementation manner, the control channel elements forming the third physical downlink control channel candidate are control channel elements with discontinuous numbers.

Further, the determining unit 1401 is further configured to determine, before determining a control channel element of one of the one or more physical downlink control channel candidates in the physical downlink control channel set, a PRB pair included in the plurality of PRB pair subsets in the physical downlink control channel PRB pair set.

Further, the sending unit 1402 is further configured to send, after the determining unit 1401 determines the PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel, a second signaling to a receiving end, where the second signaling is used to indicate the PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S represents the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer.

Specifically, in the embodiment of the DCI transmitting apparatus 140 shown in fig. 14 and 15, the determining unit 1401 and the numbering unit 1403 may be implemented by a processor, and the transmitting unit 1402 may be implemented by a transmitter, where the transmitter and the processor may communicate with each other, which is not specifically limited in this embodiment of the present invention.

Corresponding to the above DCI receiving method embodiment, an embodiment of the present invention further provides a DCI receiving apparatus, where as shown in fig. 16, the DCI receiving apparatus includes: a determining unit and a receiving unit.

The determining unit is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, and the PRB pair for the physical downlink control channel set forms a PRB pair set of physical downlink control channels, where, in a subframe k, the PRB pair set includes 6 PRB pairs, each control channel element is composed of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in a PRB pair in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements and occupies 6 control channel elements in the subframe k A PRB pair.

Further, in the subframe k, the method is used for the physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element in the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first to fourth formulas are as described in the above formula (1) -formula (4), and details are not repeated here.

Wherein, Y_p,kstartThe method is obtained by calculation according to a predefined functional relationship, wherein the predefined functional relationship is a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidate is located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidate is located, and a starting sequence of one or more subframes where the physical downlink control channel candidate is locatedA function of one or more of the sequence numbers of the second slot of the subframe; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.

Specifically, as described above, the DCI receiving apparatus according to the embodiment of the present invention may be a UE, which is not specifically limited in this embodiment of the present invention.

Specifically, in the embodiment of the DCI receiving apparatus shown in fig. 16, the determining unit may be implemented by a processor, and the receiving unit may be implemented by a receiver, where the receiver and the processor may communicate with each other, which is not specifically limited in this embodiment of the present invention.

Specifically, the method for receiving DCI by the DCI receiving apparatus according to the embodiment of the present invention may refer to the foregoing method embodiment, and the embodiment of the present invention is not described herein again.

Since the DCI receiving apparatus provided in the embodiment of the present invention may be configured to execute the DCI receiving method, the technical effect that can be obtained by the DCI receiving apparatus may also refer to the method embodiment, and is not described herein again.

Corresponding to the above DCI receiving method embodiment, an embodiment of the present invention further provides a DCI receiving apparatus 160, and as shown in fig. 16, the DCI receiving apparatus 160 includes: a determining unit 1601 and a receiving unit 1602.

The determining unit 1601 is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element in control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes multiple PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, and each control channel element is a control channel element included in a PRB pair in one PRB pair subset, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in PRB pairs in each of the plurality of PRB pairs, the control channel elements constituting the third physical downlink control channel candidate are control channel elements among the control channel elements included in PRB pairs in at least two PRB pairs of the plurality of PRB pairs.

The receiving unit 1602 is configured to receive the DCI through the one of the physical downlink control channel candidates.

In one possible implementation manner, as shown in fig. 17, the DCI receiving apparatus 160 further includes a numbering unit 1603.

The numbers of the control channel elements included in the PRB pairs in the PRB pair set are obtained by interleaving and numbering the control channel elements included in the PRB pairs in the plurality of PRB pair sets by the numbering unit 1603.

The numbering unit 1603 is specifically configured to:

Further, in the subframe k, the PRB pair in the PRB pair set p of the physical downlink control channel includesIs N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.

Further, the determining unit 1601 is further configured to determine PRB pairs included in the plurality of PRB pair subsets of the set of PRB pairs of the physical downlink control channel before determining a control channel element of one of the one or more physical downlink control channel candidates of the set of physical downlink control channel.

Further, the determining unit 1601 is further configured to determine PRB pairs in the set of PRB pairs of the physical downlink control channel before determining PRB pairs included in the plurality of sets of PRB pairs in the set of PRB pairs of the physical downlink control channel.

The receiving unit 1602 is further configured to receive a second signaling sent by a sending end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S represents the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer.

The determining unit 1601 is specifically configured to:

Further, when T is equal to 1, the determining unit 1601 is specifically configured to:

and determining PRB pairs contained in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling.

When T >1, the determining unit 1601 is specifically configured to:

And determining the PRB pairs contained in T-1 PRB subsets except the S-T PRB subsets in the PRB pair set of the physical downlink control channel by combining a first preset rule according to the PRB pairs contained in the S-T PRB subsets.

Specifically, as described above, the DCI receiving apparatus 160 according to the embodiment of the present invention may be a UE, which is not specifically limited in this embodiment of the present invention.

Specifically, in the embodiment of the DCI receiving apparatus 160 shown in fig. 16 and 17, the determining unit 1601 and the numbering unit 1603 may be implemented by a processor, and the receiving unit 1602 may be implemented by a receiver, where the receiver and the processor may communicate with each other, which is not specifically limited in this embodiment of the present invention.

Specifically, the method for receiving DCI by the DCI receiving apparatus 160 according to the embodiment of the present invention may refer to the foregoing method embodiment, and the embodiment of the present invention is not described herein again.

Since the DCI receiving apparatus 160 according to the embodiment of the present invention may be configured to perform the DCI receiving method, the technical effect that can be obtained by the DCI receiving apparatus may also refer to the method embodiment, which is not described herein again.

It will be clear to those skilled in the art that, for convenience and simplicity of description, the above-described apparatus is only illustrated by the division of the above functional modules, and in practical applications, the above-described function distribution may be performed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to perform all or part of the above-described functions. For the specific working processes of the system, the apparatus, and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

A method for transmitting Downlink Control Information (DCI), the method comprising:

determining a control channel element of one of the one or more physical downlink control channel candidates in the set of physical downlink control channels, the control channel elements are control channel elements of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pairs for the set of physical downlink control channels constitute a set of PRB pairs for physical downlink control channels, wherein, in subframe k, the set of PRB pairs comprises 6 PRB pairs, each control channel element consisting of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements contained in the PRB pairs in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements in subframe k and occupies 6 PRB pairs;

and transmitting the DCI through the one physical downlink control channel candidate.
The method of claim 1, wherein in subframe k, the method is used for a physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

wherein the set X for the physical downlink control channel is represented_mThe number of PRB pairs; the representation constitutes each control messageThe number of resource element groups of a lane element; representing the number of control channel elements contained in each PRB pair; represents rounding down; represents rounding up; mod () represents a remainder; max (a1, a2) indicates taking the larger of a1 and a 2.
The method according to claim 1 or 2, wherein in subframe k, the number of control channel elements contained in a PRB pair in the set p of PRB pairs for a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The method according to claim 3, wherein the control channel element number corresponding to the mth one of the physical downlink control channel candidates is

Wherein, Y_p,kstartThe method comprises the steps that calculation is carried out according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
A method for transmitting Downlink Control Information (DCI), the method comprising:

determining a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element in control channel elements included in a Physical Resource Block (PRB) pair used in the physical downlink control channel set, the PRB pair used in the physical downlink control channel set forms a PRB pair set of a physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in a subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes a plurality of PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, each control channel element is a control channel element included in a PRB pair in one PRB pair subset, and when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the plurality of PRB pair subsets When the number of the control channel elements included in the PRB pair in each subset in the set is the minimum, the control channel elements constituting the third physical downlink control channel candidate are the control channel elements included in the PRB pairs in at least two PRB pairs in the plurality of PRB pairs;

and transmitting the DCI through the one physical downlink control channel candidate.
The method according to claim 5, wherein the numbers of control channel elements included in PRB pairs of the set of PRB pairs are obtained by interleaving and numbering the control channel elements included in PRB pairs of the plurality of PRB pairs of the set of PRB pairs.
The method of claim 6, wherein the set of PRB pairs comprises a PRB pair subset 0, a PRB pair subset 1, … …, and a PRB pair subset S-1 comprising S PRB pair subsets, wherein the S PRB pair subsets comprise a proportion of the number of PRB pairs respectivelyIs X₀：X₁：……X_S-1；

The interleaving numbering control channel elements comprised by PRB pairs of the plurality of PRB pair subsets of the set of PRB pairs comprises:

sequentially-numbered Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。
The method according to any of claims 5-7, wherein in subframe k, the number of control channel elements contained in a PRB pair in the PRB pair set p of the physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The method according to claim 8, wherein the control channel element number corresponding to the mth one of the physical downlink control channel candidates is represented by

Wherein, Y_p,kstartThe physical downlink control channel candidate is calculated according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidate is located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidate is located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidate is located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
The method of claim 5, wherein the control channel elements constituting the third physical downlink control channel candidate are non-consecutive numbered control channel elements.
The method according to any of claims 5-10, further comprising, before said determining the control channel element of one of the one or more physical downlink control channel candidates in the set of physical downlink control channels:

determining PRB pairs contained in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel.
The method according to claim 11, wherein after the determining the PRB pairs included in the plurality of PRB pair subsets of the PRB pair set of the physical downlink control channel, further comprising:

and sending a second signaling to a receiving end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S represents the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer.
A method for receiving Downlink Control Information (DCI), the method comprising:

determining a control channel element of one of the one or more physical downlink control channel candidates in the set of physical downlink control channels, the control channel elements are control channel elements of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pairs for the set of physical downlink control channels constitute a set of PRB pairs for physical downlink control channels, wherein, in subframe k, the set of PRB pairs comprises 6 PRB pairs, each control channel element consisting of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements contained in the PRB pairs in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements in subframe k and occupies 6 PRB pairs;

and receiving the DCI through the one physical downlink control channel candidate.
The method of claim 13, wherein in subframe k, the method is used for a physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

wherein the set X for the physical downlink control channel is represented_mThe number of PRB pairs; indicating the number of resource element groups constituting each control channel element; representing the number of control channel elements contained in each PRB pair; represents rounding down; represents rounding up; mod () represents a remainder; max (a1, a2) indicates taking the larger of a1 and a 2.
The method according to claim 13 or 14, wherein in subframe k, the number of control channel elements contained in a PRB pair in the set p of PRB pairs for a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The method according to claim 15, wherein the control channel element number corresponding to the mth one of the physical downlink control channel candidates is represented by

Wherein, Y_p,kstartThe method comprises the steps that calculation is carried out according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
A method for receiving Downlink Control Information (DCI), the method comprising:

determining a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element in control channel elements included in a Physical Resource Block (PRB) pair used in the physical downlink control channel set, the PRB pair used in the physical downlink control channel set forms a PRB pair set of a physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in a subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes a plurality of PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, each control channel element is a control channel element included in a PRB pair in one PRB pair subset, and when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the plurality of PRB pair subsets When the number of the control channel elements included in the PRB pair in each subset in the set is the minimum, the control channel elements constituting the third physical downlink control channel candidate are the control channel elements included in the PRB pairs in at least two PRB pairs in the plurality of PRB pairs;

and receiving the DCI through the one physical downlink control channel candidate.
The method of claim 17, wherein the numbers of control channel elements included in PRB pairs of the set of PRB pairs are obtained by interleaving the numbers of control channel elements included in PRB pairs of the plurality of PRB pairs of the set of PRB pairs.
The method of claim 18, wherein the set of PRB pairs comprises a PRB pair subset 0, a PRB pair subset 1, … …, and a PRB pair subset S-1 comprising S PRB pair subsets, and wherein the ratio of the number of PRB pairs respectively contained in the S PRB pair subsets is X₀：X₁：……X_S-1；

The interleaving numbering control channel elements comprised by PRB pairs of the plurality of PRB pair subsets of the set of PRB pairs comprises:

sequence-first numbered PRB pairsY in set 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。
The method according to any of claims 17-19, wherein in subframe k, the number of control channel elements comprised by a PRB pair in the set p of PRB pairs for a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The method according to claim 20, wherein a control channel element number corresponding to an mth one of the physical downlink control channel candidates is represented by

Wherein, Y_p,kstartIs calculated according to a predefined functional relation, wherein the predefined functional relation is a wireless network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidate is positioned, and a subframe where the physical downlink control channel candidate is positionedA function of one or more of a sequence number of a first slot of a starting subframe of the one or more subframes, and a sequence number of a second slot of a starting subframe of the one or more subframes in which the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
The method of claim 17, wherein the control channel elements constituting the third physical downlink control channel candidate are non-consecutive numbered control channel elements.
The method according to any of claims 17-22, further comprising, before said determining the control channel element of one of the one or more physical downlink control channel candidates in the set of physical downlink control channels:

determining PRB pairs contained in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel.
The method of claim 23, wherein prior to the determining the PRB pairs included in the plurality of PRB pair subsets of the PRB pair set of the physical downlink control channel, further comprising:

determining PRB pairs in the PRB pair set of the physical downlink control channel;

receiving a second signaling sent by a sending end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S represents the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer;

the determining the PRB pairs included in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel includes:

determining the PRB pairs contained in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs in the PRB pair set of the physical downlink control channel and the second signaling.
The method according to claim 24, wherein when T ═ 1, the determining PRB pairs included in the plurality of PRB pair subsets of the set of PRB pairs of the physical downlink control channel according to the PRB pairs of the set of PRB pairs of the physical downlink control channel and the second signaling comprises:

determining PRB pairs contained in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling;

determining that the PRB pairs contained in the complement of the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel are the PRB pairs contained in the remaining T PRB pair subsets in the PRB pair set of the physical downlink control channel.
The method according to claim 24, wherein when T >1, the determining PRB pairs included in the plurality of PRB pair subsets of the PRB pair set of the physical downlink control channel according to the PRB pair of the PRB pair set of the physical downlink control channel and the second signaling comprises:

determining PRB pairs contained in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling;

determining PRB pairs contained in T-1 PRB subsets except the S-T PRB subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs contained in the S-T PRB subsets in combination with a first preset rule;

determining that the PRB pairs contained in the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel and the complementary set of the T-1 PRB pair subsets are the PRB pairs contained in the remaining 1 PRB pair subset in the PRB pair set of the physical downlink control channel.
A device for transmitting downlink control information DCI, the device comprising: a determining unit and a transmitting unit;

the determining unit is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, and the PRB pair for the physical downlink control channel set forms a PRB pair set of physical downlink control channels, where, in a subframe k, the PRB pair set includes 6 PRB pairs, each control channel element is composed of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in a PRB pair in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements and occupies 6 control channel elements in the subframe k A PRB pair;

the sending unit is configured to send the DCI through the one of the physical downlink control channel candidates.
The apparatus for transmitting DCI of claim 27, wherein in subframe k, there is used a set X of physical downlink control channels_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

wherein the set X for the physical downlink control channel is represented_mThe number of PRB pairs; indicating the number of resource element groups constituting each control channel element; representing the number of control channel elements contained in each PRB pair; represents rounding down; represents rounding up; mod () represents a remainder; max (a1, a2) indicates taking the larger of a1 and a 2.
The apparatus for transmitting DCI according to claim 27 or 28, wherein in subframe k, the number of control channel elements included in a PRB pair in the set p of PRB pairs for a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The apparatus for transmitting DCI of claim 29, wherein a control channel element number corresponding to an mth one of the physical downlink control channel candidates is

Wherein, Y_p,kstartThe method comprises the steps that calculation is carried out according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
A device for transmitting downlink control information DCI, the device comprising: a determining unit and a transmitting unit;

the determining unit is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes multiple PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, and each control channel element is a control channel element included in a PRB pair in one PRB pair subset, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in PRB pairs in each of the plurality of PRB pairs, the control channel elements constituting the third physical downlink control channel candidate are control channel elements among the control channel elements included in PRB pairs in at least two PRB pairs of the plurality of PRB pairs;

the sending unit is configured to send the DCI through the one of the physical downlink control channel candidates.
The apparatus for transmitting DCI according to claim 31, further comprising a numbering unit;

the number of the control channel element included in the PRB pair set is obtained by interleaving and numbering the control channel element included in the PRB pair in the plurality of PRB pair subsets in the PRB pair set by the numbering unit.
The apparatus for transmitting DCI according to claim 32, wherein the set of PRB pairs comprises PRB pair subset 0, PRB pair subset 1, … …, and PRB pair subset S-1 comprising S PRB pair subsets, and the ratio of the number of PRB pairs respectively contained in the S PRB pair subsets is X₀：X₁：……X_S-1；

The numbering unit is specifically configured to:

sequentially-numbered Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。
The apparatus for transmitting DCI according to any one of claims 31-33, wherein in subframe k, the number of control channel elements comprised in a PRB pair in the set p of PRB pairs for a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The apparatus for transmitting DCI of claim 34, wherein the control channel element number corresponding to the mth one of the physical downlink control channel candidates is

Wherein, Y_p,kstartIs calculated according to a predefined functional relationship, theThe predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes in which the physical downlink control channel candidate is located, a sequence number of a first time slot of the starting subframe of one or more subframes in which the physical downlink control channel candidate is located, and a sequence number of a second time slot of the starting subframe of one or more subframes in which the physical downlink control channel candidate is located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
The apparatus for transmitting DCI according to claim 31, wherein the control channel elements constituting the third physical downlink control channel candidate are non-numbered control channel elements.
The apparatus for transmitting DCI of any one of claims 31-36,

the determining unit is further configured to determine PRB pairs included in the plurality of PRB pair subsets in the set of PRB pairs of the physical downlink control channel before determining a control channel element of one or more physical downlink control channel candidates in the set of physical downlink control channel.
The apparatus for transmitting DCI according to claim 37, wherein the transmitting unit is further configured to transmit a second signaling to a receiving end after the determining unit determines the PRB pairs included in the plurality of PRB pair subsets in the set of PRB pairs of the physical downlink control channel, where the second signaling indicates PRB pairs included in S-T PRB pair subsets in the set of PRB pairs of the physical downlink control channel, S represents the number of PRB pair subsets in the set of PRB pairs of the physical downlink control channel, and T is a fixed positive integer.
A receiving device of Downlink Control Information (DCI), the receiving device of DCI comprising: a determining unit and a receiving unit;

the determining unit is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, and the PRB pair for the physical downlink control channel set forms a PRB pair set of physical downlink control channels, where, in a subframe k, the PRB pair set includes 6 PRB pairs, each control channel element is composed of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in a PRB pair in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements and occupies 6 control channel elements in the subframe k A PRB pair;

the receiving unit is configured to receive the DCI through the one of the physical downlink control channel candidates.
The apparatus for receiving DCI of claim 39, wherein in subframe k, the apparatus is configured to use a physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

wherein the set X for the physical downlink control channel is represented_mThe number of PRB pairs; indicating the number of resource element groups constituting each control channel element; representing the number of control channel elements contained in each PRB pair; represents rounding down; represents rounding up; mod () represents a remainder; max (a1, a2) represents taking the values of a1 and a2The larger value.
The apparatus for receiving DCI of claim 39 or 40, wherein in subframe k, the number of control channel elements contained in PRB pairs in PRB pair set p of physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The apparatus for receiving DCI of claim 41, wherein the control channel element number corresponding to the mth one of the physical downlink control channel candidates is

Wherein, Y_p,kstartThe method comprises the steps that calculation is carried out according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L _k-1; represents rounding down; represents rounding up; mod () represents a remainder.
A receiving device of Downlink Control Information (DCI), the receiving device of DCI comprising: a determining unit and a receiving unit;

the determining unit is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes multiple PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, and each control channel element is a control channel element included in a PRB pair in one PRB pair subset, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in PRB pairs in each of the plurality of PRB pairs, the control channel elements constituting the third physical downlink control channel candidate are control channel elements among the control channel elements included in PRB pairs in at least two PRB pairs of the plurality of PRB pairs;

the receiving unit is configured to receive the DCI through the one of the physical downlink control channel candidates.
The apparatus for receiving DCI of claim 43, further comprising a numbering unit;

the number of the control channel element included in the PRB pair set is obtained by interleaving and numbering the control channel element included in the PRB pair in the plurality of PRB pair subsets in the PRB pair set by the numbering unit.
The apparatus for receiving DCI according to claim 44, wherein the set of PRB pairs comprises S PRB pair subsets including PRB pair subset 0, PRB pair subset 1, … …, and PRB pair subset S-1The ratio of the number of PRB pairs respectively contained in the S PRB pair subsets is X₀：X₁：……X_S-1；

The numbering unit is specifically configured to:

sequentially-numbered Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。
The apparatus for receiving DCI of any of claims 43-45, wherein in subframe k, the number of control channel elements contained in PRB pairs in PRB pair set p of physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The DCI receiving device of claim 46, wherein the control channel element number corresponding to the mth one of the physical downlink control channel candidates is

Wherein, Y_p,kstartThe physical downlink control channel candidate is calculated according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidate is located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidate is located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidate is located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
The apparatus for receiving DCI of claim 43, wherein the control channel elements constituting the third physical downlink control channel candidate are non-consecutive numbered control channel elements.
The apparatus for receiving DCI of any one of claims 43-48,

the determining unit is further configured to determine PRB pairs included in the plurality of PRB pair subsets in the set of PRB pairs of the physical downlink control channel before determining a control channel element of one or more physical downlink control channel candidates in the set of physical downlink control channel.
The apparatus for receiving DCI of claim 49,

the determining unit is further configured to determine PRB pairs in the set of PRB pairs of the physical downlink control channel before the determining of PRB pairs included in the plurality of sets of PRB pairs in the set of PRB pairs of the physical downlink control channel;

the receiving unit is further configured to receive a second signaling sent by a sending end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S denotes the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer;

the determining unit is specifically configured to:

determining the PRB pairs contained in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs in the PRB pair set of the physical downlink control channel and the second signaling.
The DCI receiving device of claim 50, wherein when T is 1, the determining unit is specifically configured to:

determining PRB pairs contained in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling;

determining that the PRB pairs contained in the complement of the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel are the PRB pairs contained in the remaining T PRB pair subsets in the PRB pair set of the physical downlink control channel.
The DCI receiving device of claim 50, wherein when T >1, the determining unit is specifically configured to:

determining PRB pairs contained in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling;

determining PRB pairs contained in T-1 PRB subsets except the S-T PRB subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs contained in the S-T PRB subsets in combination with a first preset rule;

determining that the PRB pairs contained in the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel and the complementary set of the T-1 PRB pair subsets are the PRB pairs contained in the remaining 1 PRB pair subset in the PRB pair set of the physical downlink control channel.
A device for transmitting downlink control information DCI, the device comprising: a processor and a transmitter;

the processor is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, and the PRB pair for the physical downlink control channel set forms a PRB pair set of physical downlink control channels, where, in a subframe k, the PRB pair set includes 6 PRB pairs, each control channel element is composed of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in a PRB pair in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements and occupies 6 PRB in the subframe k Carrying out pairing;

the transmitter is configured to transmit the DCI through the one of the physical downlink control channel candidates.
The apparatus for transmitting DCI of claim 53, wherein in subframe k, it is used for physical downlink control channel set X_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

wherein the set X for the physical downlink control channel is represented_mThe number of PRB pairs; indicating the number of resource element groups constituting each control channel element; representing the number of control channel elements contained in each PRB pair; represents rounding down; represents rounding up; mod () represents a remainder; max (a1, a2) indicates taking the larger of a1 and a 2.
The apparatus for transmitting DCI of claim 53 or 54, wherein in subframe k, the number of control channel elements contained in PRB pairs in PRB pair set p of physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The apparatus for transmitting DCI of claim 55, wherein a control channel element number corresponding to an mth one of said physical downlink control channel candidates is C

Wherein, Y_p,kstartThe method comprises the steps that calculation is carried out according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
A device for transmitting downlink control information DCI, the device comprising: a processor and a transmitter;

the processor is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes multiple PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, and each control channel element is a control channel element included in a PRB pair in one PRB pair subset, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in PRB pairs in each of the plurality of PRB pairs, the control channel elements constituting the third physical downlink control channel candidate are control channel elements among the control channel elements included in PRB pairs in at least two PRB pairs of the plurality of PRB pairs;

the transmitter is configured to transmit the DCI through the one of the physical downlink control channel candidates.
The apparatus for transmitting the DCI according to claim 57, wherein the numbers of the control channel elements included in the PRB pairs in the set of PRB pairs are obtained by the processor interleaving the numbers of the control channel elements included in the PRB pairs in the plurality of PRB pairs in the set of PRB pairs.
The apparatus for transmitting the DCI of claim 58, wherein the set of PRB pairs comprises PRB pair subset 0, PRB pair subset 1, … …, and PRB pair subset S-1 with S PRB pair subsets, and the ratio of the number of PRB pairs respectively contained in the S PRB pair subsets is X₀：X₁：……X_S-1；

The processor is specifically configured to:

sequentially-numbered Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。
The apparatus for transmitting the DCI of any one of claims 57-59, wherein in subframe k, the number of control channel elements contained in PRB pairs in PRB pair set p of physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The apparatus for transmitting DCI of claim 60, wherein the control channel element number corresponding to the mth one of the physical downlink control channel candidates is

Wherein, Y_p,kstartIs calculated according to a predefined functional relation, wherein the predefined functional relation is a wireless network temporary identifier and a starting sub-frame of one or more sub-frames where the physical downlink control channel candidate is positionedA function of one or more of a subframe number of a frame, a number of a first slot of a starting subframe of one or more subframes in which the physical downlink control channel candidates are located, and a number of a second slot of a starting subframe of one or more subframes in which the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
The apparatus for transmitting DCI of claim 57, wherein the control channel elements constituting the third physical downlink control channel candidate are non-numbered control channel elements.
The apparatus for transmitting DCI of any one of claims 57-62,

the processor is further configured to determine PRB pairs included in the plurality of PRB pair subsets of the set of PRB pairs of the physical downlink control channel before determining a control channel element of one of the one or more physical downlink control channel candidates of the set of physical downlink control channel.
The apparatus for transmitting DCI according to claim 63, wherein the transmitter is further configured to transmit a second signaling to a receiving end after the processor determines the PRB pairs included in the plurality of PRB pair subsets in the set of PRB pairs for the physical downlink control channel, where the second signaling indicates the PRB pairs included in S-T PRB pair subsets in the set of PRB pairs for the physical downlink control channel, S represents the number of PRB pair subsets in the set of PRB pairs for the physical downlink control channel, and T is a fixed positive integer.
A receiving device of Downlink Control Information (DCI), the receiving device of DCI comprising: a processor and a receiver;

the processor is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, and the PRB pair for the physical downlink control channel set forms a PRB pair set of physical downlink control channels, where, in a subframe k, the PRB pair set includes 6 PRB pairs, each control channel element is composed of 4 or 8 resource element groups, the 4 resource element groups are in 4 PRB pairs, the 8 resource element groups are in 6 PRB pairs, and there are 2 control channel elements in the control channel elements included in a PRB pair in the PRB pair set, and a first physical downlink control channel candidate is composed of the 2 control channel elements and occupies 6 PRB in the subframe k Carrying out pairing;

the receiver is configured to receive the DCI through the one of the physical downlink control channel candidates.
The DCI receiving device of claim 65, wherein in subframe k, there is a set X of physical downlink control channels_mThe PRB index where the numbered resource element group corresponding to the numbered control channel element among the control channel elements included in the PRB pair is the same as an index obtained by any one of the following first to fourth formulas, where the first formula includes:

the second formula includes:

the third formula includes:

the fourth formula includes:

wherein the set X for the physical downlink control channel is represented_mThe number of PRB pairs; indicating the number of resource element groups constituting each control channel element; representing the number of control channel elements contained in each PRB pair; represents rounding down; represents rounding up; mod () represents a remainder; max (a1, a2) indicates taking the larger of a1 and a 2.
The apparatus for receiving DCI of claim 65 or 66,the number of control channel elements contained in PRB pairs in a PRB pair set p of a physical downlink control channel in a subframe k is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing completely, there is a second physical downlink control channel candidate, and the control channel elements composing the second physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The apparatus for receiving DCI of claim 67, wherein the control channel element number corresponding to the mth one of the physical downlink control channel candidates is

Wherein, Y_p,kstartThe method comprises the steps that calculation is carried out according to a predefined functional relation, wherein the predefined functional relation is a function of one or more of a radio network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidates are located, a sequence number of a first time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located, and a sequence number of a second time slot of the starting subframe of one or more subframes where the physical downlink control channel candidates are located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
A receiving device of Downlink Control Information (DCI), the receiving device of DCI comprising: a processor and a receiver;

the processor is configured to determine a control channel element of one or more physical downlink control channel candidates in a physical downlink control channel set, where the control channel element is a control channel element of control channel elements included in a physical resource block PRB pair for the physical downlink control channel set, the PRB pair for the physical downlink control channel set forms a PRB pair set of the physical downlink control channel, and a third physical downlink control channel candidate exists in the physical downlink control channel set, where, in subframe k, the PRB pair set includes 6 PRB pairs, the PRB pair set includes multiple PRB pair subsets, each PRB pair subset includes 2 or 4 PRB pairs, and each control channel element is a control channel element included in a PRB pair in one PRB pair subset, when the number of control channel elements constituting the third physical downlink control channel candidate is greater than 1 and not greater than the minimum value of the number of control channel elements included in PRB pairs in each of the plurality of PRB pairs, the control channel elements constituting the third physical downlink control channel candidate are control channel elements among the control channel elements included in PRB pairs in at least two PRB pairs of the plurality of PRB pairs;

the receiver is configured to receive the DCI through the one of the physical downlink control channel candidates.
The apparatus for receiving DCI according to claim 69, wherein the numbers of the control channel elements included in the PRB pairs in the set of PRB pairs are obtained by the processor interleaving the numbers of the control channel elements included in the PRB pairs in the plurality of PRB pairs in the set of PRB pairs.
The apparatus for receiving DCI according to claim 60, wherein the set of PRB pairs comprises PRB pair subset 0, PRB pair subset 1, … …, and PRB pair subset S-1 with S PRB pair subsets, and the ratio of the number of PRB pairs respectively contained in the S PRB pair subsets is X₀：X₁：……X_S-1；

The processor is specifically configured to:

sequentially-numbered PRB pairs in subset 0Y₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁One control channel element, … …, followed by sequentially numbering Y in the subset S-1 of PRB pairs_S-1One control channel element, followed by sequentially numbering Y in PRB pair subset 0₀One control channel element, followed by sequentially numbering Y in PRB pair subset 1₁Control channel elements, … …, until the control channel element numbering contained by a PRB pair in the set of PRB pairs is complete, wherein Y is₀：Y₁：……Y_S-1＝X₀：X₁：……X_S-1。
The apparatus for receiving DCI of any one of claims 69-71, wherein in subframe k, the number of control channel elements comprised in a PRB pair in the set p of PRB pairs for a physical downlink control channel is N_CCE,p,kNumbered 0 to N_CCE,p,k-1, one physical downlink control channel candidate in the PRB pair set p of the physical downlink control channel consists of L_kA control channel element consisting of_CCE,p,kCan not be covered with L_kWhen dividing, there is a fourth physical downlink control channel candidate, and the control channel elements composing the fourth physical downlink control channel candidate include the number N_CCE,p,k-L_k1From the control channel element to the numbered consecutive L in the most numbered control channel element_k1A control channel element, and L's that are consecutive in number starting from the smallest-numbered control channel element_k-L_k1A control channel element.
The DCI receiving device of claim 72, wherein a control channel element number corresponding to an mth one of the physical downlink control channel candidates is

Wherein, Y_p,kstartIs calculated according to a predefined functional relation, wherein the predefined functional relation is a wireless network temporary identifier, a subframe sequence number of a starting subframe of one or more subframes where the physical downlink control channel candidate is positioned, and the physical downlink control channel candidateSelecting one or more of the sequence number of the first time slot of the initial subframe of the one or more subframes where the physical downlink control channel candidate is located and the sequence number of the second time slot of the initial subframe of the one or more subframes where the physical downlink control channel candidate is located; b is equal to the value of the carrier indication field or equal to 0; i ═ 0.., L_k-1; represents rounding down; represents rounding up; mod () represents a remainder.
The apparatus for receiving DCI of claim 69, wherein the control channel elements constituting the third physical downlink control channel candidate are non-consecutive numbered control channel elements.
The apparatus for receiving DCI of any of claims 69-74,

the processor is further configured to determine PRB pairs included in the plurality of PRB pair subsets of the set of PRB pairs of the physical downlink control channel before determining a control channel element of one of the one or more physical downlink control channel candidates of the set of physical downlink control channel.
The apparatus for receiving DCI of claim 75,

the processor is further configured to determine PRB pairs in the set of PRB pairs of the physical downlink control channel before the determining PRB pairs included in the plurality of sets of PRB pairs in the set of PRB pairs of the physical downlink control channel;

the receiver is further configured to receive a second signaling sent by a sending end, where the second signaling is used to indicate PRB pairs included in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel, S denotes the number of PRB pair subsets in the PRB pair set of the physical downlink control channel, and T is a fixed positive integer;

the processor is specifically configured to:

determining the PRB pairs contained in the plurality of PRB pair subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs in the PRB pair set of the physical downlink control channel and the second signaling.
The apparatus for receiving DCI of claim 76, wherein when T ═ 1, the processor is configured to:

determining PRB pairs contained in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling;

determining that the PRB pairs contained in the complement of the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel are the PRB pairs contained in the remaining T PRB pair subsets in the PRB pair set of the physical downlink control channel.
The apparatus for receiving DCI of claim 76, wherein when T >1, the processor is configured to:

determining PRB pairs contained in S-T PRB pair subsets in the PRB pair set of the physical downlink control channel according to the second signaling;

determining PRB pairs contained in T-1 PRB subsets except the S-T PRB subsets in the PRB pair set of the physical downlink control channel according to the PRB pairs contained in the S-T PRB subsets in combination with a first preset rule;

determining that the PRB pairs contained in the S-T PRB pair subsets in the PRB pair set of the physical downlink control channel and the complementary set of the T-1 PRB pair subsets are the PRB pairs contained in the remaining 1 PRB pair subset in the PRB pair set of the physical downlink control channel.