CN108174453A

CN108174453A - Transmission, detection method and device, base station and the terminal of Downlink Control Information

Info

Publication number: CN108174453A
Application number: CN201611117650.XA
Authority: CN
Inventors: 张晨晨; 郝鹏
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-12-07
Filing date: 2016-12-07
Publication date: 2018-06-15
Also published as: WO2018103558A1

Abstract

The invention discloses a kind of transmission of Downlink Control Information, detection method and device, base station and terminal, the sending method of the Downlink Control Information includes：The group radio network temporary identifier of user group where base station determines terminal, using described group of radio network temporary identifier to sending described group of Downlink Control Information to the terminal by Physical Downlink Control Channel after the group Downlink Control Information progress cyclic redundancy check scrambling of user group where the terminal.The detection method of the Downlink Control Information includes：Terminal acquisition group radio network temporary identifier carries out blind Detecting, the group Downlink Control Information of user group where obtaining the terminal using this group of radio network temporary identifier in the search space of Physical Downlink Control Channel.

Description

Method and device for sending and detecting downlink control information, base station and terminal

Technical Field

The present invention relates to, but not limited to, the field of wireless communication technologies, and in particular, to a method and an apparatus for sending downlink control information, a method and an apparatus for detecting downlink control information, a base station, and a terminal.

Background

With the development of wireless communication technology and the increasing demand of users for communication, fifth Generation mobile communication (5th Generation, abbreviated as: 5G) technology has become a trend of future network development in order to meet the demand for higher, faster and more recent communication.

High frequency communication is one of important communication means of the future 5G technology, and high speed data communication can be provided by using a large bandwidth of high frequency communication to meet the demand for a large data volume in 5G communication. The loss is larger in high-frequency propagation, and the coverage radius is relatively smaller under the same power, which also determines that in the networking of a high-frequency communication system, a beamforming technology needs to be adopted for increasing the coverage radius. The number of radio Frequency links, transmission power, beam gain, and other factors are limited, and for a downlink traffic channel or a downlink data channel, all downlink beams covering the entire cell cannot be simultaneously transmitted on the same OFDM (Orthogonal Frequency Division Multiplexing) symbol, that is, a beam on one symbol is difficult to cover the entire cell and can only cover one beam group. For the transmission of the Downlink Control Channel, limited by the characteristic of narrow coverage of beam in high frequency communication, it may need to use how to Control DCI (Downlink Control Information) overhead as a central importance, otherwise if the DCI overhead is large, the PDCCH (Physical Downlink Control Channel) domain may need too many time-frequency resources to achieve good coverage and further transmit with beam scanning. Therefore, there is a need to provide a DCI transmission scheme.

Disclosure of Invention

The invention provides a sending method and device, a detection method and device, a base station and a terminal of downlink control information, which can reduce DCI overhead.

In order to achieve the object of the present invention, an embodiment of the present invention provides a method for sending downlink control information, including:

the base station determines a group wireless network temporary identifier of a user group where the terminal is located, and sends the group downlink control information to the terminal through a physical downlink control channel after the group wireless network temporary identifier is used for carrying out cyclic redundancy check scrambling on the group downlink control information of the user group where the terminal is located.

Optionally, the determining, by the base station, the group radio network temporary identifier of the user group in which the terminal is located includes: and the base station determines the group wireless network temporary identifier of the user group in which the terminal is positioned according to the mapping relation information of the group related information and the group wireless network temporary identifier which are configured in advance.

Optionally, the method further includes: the base station sends the mapping relation information to the terminal through a wireless resource control signaling or a system message; or, the base station and the terminal agree the mapping relationship information in advance.

Optionally, the group related information includes one or a combination of the following: the information of the beam carrying the group of downlink control information, the radio frame number of the radio frame carrying the group of downlink control information, the time slot number of the time slot carrying the group of downlink control information, the subframe number of the subframe carrying the group of downlink control information, the subband information of the downlink control channel carrying the group of downlink control information, the subband information of the downlink traffic channel related to the group of downlink control information, the subcarrier interval information of the downlink control channel carrying the group of downlink control information, the subcarrier interval information of the downlink traffic channel related to the group of downlink control information, and the time slot structure information of the predefined transmission time unit carrying the group of downlink control information.

An embodiment of the present invention further provides a downlink control information sending apparatus, including:

the group wireless network temporary identifier determining unit is used for determining the group wireless network temporary identifier of the user group in which the terminal is positioned;

the processing unit is used for carrying out cyclic redundancy check scrambling on the group downlink control information of the user group where the terminal is located by using the group wireless network temporary identifier;

a sending unit, configured to send the scrambled set of downlink control information to the terminal through a physical downlink control channel.

6. The apparatus of claim 5,

the determining, by the group radio network temporary identifier determining unit, a group radio network temporary identifier of a user group in which the terminal is located includes:

and determining the group wireless network temporary identifier of the user group in which the terminal is positioned according to the mapping relation information of the pre-configured group related information and the group wireless network temporary identifier.

Optionally, the sending unit is further configured to: and sending the mapping relation information to the terminal through radio resource control signaling or system information.

The embodiment of the invention also provides a base station, which comprises the downlink control information sending device.

The embodiment of the invention also provides a downlink control information detection method, which comprises the following steps:

the terminal acquires a group wireless network temporary identifier, performs blind detection in a search space of a physical downlink control channel by using the group wireless network temporary identifier, and acquires group downlink control information of a user group in which the terminal is located.

Optionally, the acquiring, by the terminal, the group radio network temporary identifier includes: and the terminal determines the group wireless network temporary identifier of the user group in which the terminal is positioned according to the mapping relation information between the group related information and the group wireless network temporary identifier.

Optionally, the method further includes that the terminal obtains the mapping relationship information in the following manner: and the terminal receives the mapping relation information from the base station, or the terminal and the base station agree on the mapping relation information in advance.

Optionally, the receiving, by the terminal, the mapping relationship information from the base station includes: and the terminal receives the mapping relation information sent by the base station through a wireless resource control signaling or a system message.

Optionally, the group related information includes one or a combination of the following: current beam information, current wireless frame number, current time slot serial number, current subframe number, current sub-band information of a downlink control channel, current sub-band information of a downlink service channel, current sub-carrier interval information of the downlink control channel, current sub-carrier interval information of the downlink service channel, and current time slot structure information of a predefined transmission time unit.

Optionally, the acquiring, by the terminal, the group radio network temporary identifier includes: the terminal receives a candidate group wireless network temporary identifier set configured by a base station through a wireless resource control signaling, and acquires each group wireless network temporary identifier in the group wireless network temporary identifier set;

the using the group of radio network temporary identifiers to perform blind detection in a search space of a physical downlink control channel, and acquiring the group downlink control information of the user group in which the terminal is located includes:

and the terminal performs blind detection in a search space of a physical downlink control channel by sequentially using the group radio network temporary identifications in the candidate group radio network temporary identification set until group downlink control information of a user group in which the terminal is located is acquired.

Optionally, the performing blind detection in the search space of the physical downlink control channel by using the set of radio network temporary identifiers includes:

blind detection is carried out in a search space which is configured in a semi-static way by a wireless resource control signaling and corresponds to the whole physical downlink control channel;

or, blind detection is carried out in a search space corresponding to the group downlink control information configured by the base station in a semi-static manner through radio resource control signaling;

or,

the terminal receives a mapping relation between a group wireless network temporary identifier and a search space, wherein the group wireless network temporary identifier is configured by a base station in a semi-static mode through wireless resource control signaling, the search space corresponding to the group wireless network temporary identifier of a user group where the terminal is located is determined according to the mapping relation, and blind detection is carried out in the search space corresponding to the group wireless network temporary identifier of the user group where the terminal is located.

An embodiment of the present invention further provides a downlink control information detection apparatus, including:

a group wireless network temporary identifier obtaining unit, configured to obtain a group wireless network temporary identifier;

and the blind detection unit is used for carrying out blind detection in the search space of the physical downlink control channel by using the group of wireless network temporary identifications to acquire the group downlink control information of the user group in which the terminal is positioned.

Optionally, the acquiring of the group radio network temporary identifier by the group radio network temporary identifier acquiring unit includes:

and determining the group wireless network temporary identifier of the user group in which the terminal is positioned according to the mapping relation information between the group related information and the group wireless network temporary identifier.

Optionally, the group of radio network temporary identifiers obtaining unit is further configured to obtain the mapping relationship information according to the following manner: and receiving the mapping relation information from the base station, or agreeing the mapping relation information with the base station in advance.

Optionally, the receiving, by the group radio network temporary identifier obtaining unit, the mapping relationship information from the base station includes: and receiving the mapping relation information sent by the base station through a wireless resource control signaling or a system message.

Optionally, the acquiring of the group radio network temporary identifier by the group radio network temporary identifier acquiring unit includes: receiving a candidate group wireless network temporary identifier set configured by a base station through a wireless resource control signaling, and acquiring each group wireless network temporary identifier in the group wireless network temporary identifier set;

the blind detection unit performs blind detection in a search space of a physical downlink control channel by using the group of radio network temporary identifiers, and acquiring group downlink control information of a user group in which the terminal is located includes:

and the blind detection unit carries out blind detection in a search space of a physical downlink control channel by sequentially using the group radio network temporary identifications in the candidate group radio network temporary identification set until the group downlink control information of the user group in which the terminal is positioned is obtained.

Optionally, the blind detecting, performed by the blind detecting unit in the search space of the physical downlink control channel, includes:

or, blind detection is carried out in a search space of the corresponding group of downlink control information which is configured by the base station in a semi-static mode through radio resource control signaling;

or,

receiving a mapping relation between a group wireless network temporary identifier and a search space, which are semi-statically configured by a base station through wireless resource control signaling, determining the search space corresponding to the group wireless network temporary identifier of a user group in which the terminal is located according to the mapping relation, and performing blind detection in the search space corresponding to the group wireless network temporary identifier of the user group in which the terminal is located.

The embodiment of the invention also provides a terminal, which comprises the downlink control information detection device.

Compared with the prior art, in the embodiment of the invention, the terminal acquires the group wireless network temporary identifier, and performs blind detection in the search space of the physical downlink control channel by using the group wireless network temporary identifier to acquire the group downlink control information of the user group in which the terminal is positioned. And the Group RNTI is adopted to descramble the Group DCI, so that the DCI overhead is reduced.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a diagram illustrating a search space being a full PDCCH search space according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a search space being a partial PDCCH search space according to an embodiment of the present invention;

fig. 3 is a schematic diagram of different search spaces corresponding to different groups of radio network temporary identifiers according to an embodiment of the present invention;

fig. 4 is another schematic diagram of different search spaces corresponding to different sets of radio network temporary identifiers according to an embodiment of the present invention;

fig. 5 is a block diagram of a downlink control information transmitting apparatus according to an embodiment of the present invention;

fig. 6 is a block diagram of a downlink control information detection apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

For users with certain same transmission characteristics, if the transmission characteristics need to be indicated to the users in DCI, then if Group DCI (Group downlink control information) is used to carry the transmission characteristics, and DCI is prevented from being sent to each user, DCI overhead can be greatly reduced, which is more suitable for the characteristics of high-frequency communication beams.

The PDCCH transmitted by the base station to the user may include one or more of Common DCI (Common downlink control information), GroupDCI, and UE-specific DCI (user-specific downlink control information). The present application is primarily set forth with respect to GroupDCI. According to some transmission information of users, the users can be divided into a plurality of groups (groups), the transmission information of all users in the same Group is the same, the transmission information is Group DCI, and the Group DCI in different groups is different.

When a base station transmits Group DCI to users in the same Group, the base station performs CRC scrambling on the Group DCI by using a Group-specific (Group-specific) mode and Group RNTI (Group radio network temporary identity) corresponding to the Group of users.

Correspondingly, when receiving the downlink control channel, the UE (User Equipment) performs blind detection in a certain search space, and may attempt to descramble the CRC by using the Group RNTI of the Group where the UE is located, and if the CRC can be successfully descrambled, the UE may read the Group DCI content.

The Group RNTI is an identifier which is calculated according to some Group information and/or some system information of a Group of users different from other groups of users and can uniquely determine the user Group at the current time.

The embodiment of the invention provides a method for sending downlink control information, which comprises the following steps:

In an embodiment of the present invention, the determining, by the base station, the group radio network temporary identifier of the user group in which the terminal is located includes: and the base station determines the group wireless network temporary identifier of the user group in which the terminal is positioned according to the mapping relation information of the group related information and the group wireless network temporary identifier which are configured in advance. The mapping relationship information may be a mapping table or a functional relationship. The base station can acquire group related information, search the mapping table and acquire group downlink control information of a user group in which the terminal is located; or, the base station may also obtain the group related information, and perform calculation according to the functional relationship to obtain the group downlink control information of the user group in which the terminal is located.

In another embodiment of the present invention, the base station sends the mapping relation information to the terminal through radio resource control signaling or system message; or, the base station and the terminal agree the mapping relationship information in advance. For example, the base station may send the mapping table to the terminal, or may agree with the terminal in advance for the mapping table. Of course, the base station may also send the functional relationship to the terminal, or the base station may agree with the functional relationship in advance with the terminal.

In a further embodiment of the present invention, the set of related information comprises one or a combination of the following: the information of the beam carrying the group of downlink control information, the radio frame number of the radio frame carrying the group of downlink control information, the time slot number of the time slot carrying the group of downlink control information, the subframe number of the subframe carrying the group of downlink control information, the subband information of the downlink control channel carrying the group of downlink control information, the subband information of the downlink traffic channel related to the group of downlink control information, the subcarrier interval information of the downlink control channel carrying the group of downlink control information, the subcarrier interval information of the downlink traffic channel related to the group of downlink control information, and the time slot structure information of the predefined transmission time unit carrying the group of downlink control information. Wherein the beam information may be a beam identification; the subband information may be a subband identity and the subcarrier spacing information may be a Numerology identity. The timeslot structure information refers to a transmission structure determined by values and specific positions of x, y, and z in a predefined transmission time unit if a downlink transmission domain occupies x symbols, a GP (Guard Period) domain occupies y symbols, and an uplink transmission domain occupies z symbols. The predefined transmission time unit may be one subframe, one slot, one mini-slot (mini-slot) or one aggregation subframe, one aggregation slot, or one aggregation mini-slot, which is only an example here, and the resource included in the transmission time unit may be specified as needed. The base station and the terminal may pre-agree which transmission time unit is specifically referred to.

In still another embodiment of the present invention, the method further includes configuring, by the base station, a candidate set of radio network temporary identifications to the terminal through radio resource control signaling. The terminal may perform blind detection using the group radio network temporary identifier in the candidate group radio network temporary identifier set.

In an embodiment of the present invention, the acquiring, by the terminal, the group radio network temporary identifier includes:

and the terminal determines the group wireless network temporary identifier of the user group in which the terminal is positioned according to the mapping relation information between the group related information and the group wireless network temporary identifier.

In another embodiment of the present invention, the terminal obtains the mapping relationship information by: and the terminal receives the mapping relation information from the base station, or the terminal and the base station agree on the mapping relation information in advance.

In another embodiment of the present invention, the receiving, by the terminal, the mapping relationship information from the base station includes: and receiving the mapping relation information sent by the base station through a wireless resource control signaling or a system message.

In a further embodiment of the present invention, the set of related information comprises one or a combination of the following: current beam information, current wireless frame number, current time slot serial number, current subframe number, current sub-band information of a downlink control channel, current sub-band information of a downlink service channel, current sub-carrier interval information of the downlink control channel, current sub-carrier interval information of the downlink service channel, and current time slot structure information of a predefined transmission time unit. Wherein the beam information may be a beam identification; the subband information may be a subband identity; the subcarrier spacing information may be a Numerology identification. The current information refers to the relevant information of the time-frequency resources to be detected by the terminal in a blind mode. For example, the current beam information refers to beam information of a beam where a frequency resource is currently to be detected by the terminal, the subband information of the current downlink control channel refers to subband information of the downlink control channel to be currently blind-detected by the terminal, and the subband information of the current downlink traffic channel refers to subband information of a downlink traffic channel related to the downlink control channel to be currently blind-detected by the terminal, and so on.

In another embodiment of the present invention, the terminal cannot determine the specific value of the group radio network temporary identifier, only one group radio network temporary identifier set configured by the base station is used, and the terminal sequentially uses the group radio network temporary identifiers in the set to perform blind detection until group downlink control information of the user group in which the terminal is located is obtained. Specifically, the acquiring, by the terminal, the group radio network temporary identifier includes: the terminal receives a candidate group wireless network temporary identifier set configured by a base station through a wireless resource control signaling, and acquires each group wireless network temporary identifier in the group wireless network temporary identifier set;

and the terminal carries out blind detection in a search space of a physical downlink control channel by sequentially using the group radio network temporary identifications in the candidate group radio network temporary identification set until group downlink control information of a user group in which the terminal is positioned is obtained.

In another embodiment of the present invention, the performing the blind detection in the search space of the physical downlink control channel by using the set of radio network temporary identifiers includes:

or,

In an embodiment of the present invention, the search space for the UE to perform blind detection may be a search space corresponding to the entire PDCCH, which is configured by the base station in a semi-static manner through RRC signaling, as shown in fig. 1, and a shaded portion in fig. 1 is the search space corresponding to the entire PDCCH. In this case, a search space is not separately configured for Group DCI, and blind detection of Group DCI is performed directly in the search space of PDCCH.

In another embodiment of the present invention, the search space for the UE to perform blind detection may be a Group search space corresponding to Group DCI configured by the base station in a semi-static manner through RRC signaling, and is a partial PDCCH search space, as shown in the shaded portion in fig. 2. In this way, a Group search space is configured for the Group DCI, and the Group DCI only needs to be blindly detected in the Group search space configured for the Group DCI.

In yet another embodiment of the present invention, different search spaces may be configured for Group RNTIs. The search space in which the UE performs blind detection may be a search space corresponding to a Group RNTI of a user Group in which the UE is located. Wherein, different GroupRNTI may correspond to different search spaces, that is, there is a mapping relationship between the Group RNTI and the search spaces, which may be a one-to-one correspondence relationship, as shown in fig. 3, 4 Group search spaces respectively correspond to different Group RNTIs, and different shadow types in fig. 3 represent different Group search spaces respectively corresponding to different Group RNTIs; or a relation that a plurality of GroupRNTI correspond to one search space. Fig. 2 differs from fig. 3 in that all Group RNTIs in fig. 2 correspond to one Group search space, and in fig. 3, different Group RNTIs correspond to different search spaces. For example, when there are four Group RNTIs, Group RNTI1, Group RNTI2, Group RNTI3 and Group RNTI4, Group RNTI1, Group RNTI2, Group RNTI3 and Group RNTI4 correspond to the search space of the shaded portion in fig. 2,

the base station can semi-statically configure the mapping relationship between the Group RNTI and the search space through RRC signaling, so that when the UE performs blind detection by using different Group RNTIs, the UE only needs to perform blind detection in the search space corresponding to the Group RNTI.

The notification bit of the RNTI can be implemented in two ways:

one way is to not extend the notification bit of the existing RNTI, i.e. to still notify the RNTI by 16 bits, and reserve the first or the last values of the value range of the LTEC-RNTI to the Group RNTI, which values are reserved to the Group RNTI and can not be used by other types of RNTIs.

Another way is to extend the notification bit of the existing RNTI and notify the RNTI with 20 bits or 24 bits or 28 bits, so that the Group RNTI value can start from 0 FFFF.

One Group RNTI may correspond to a pilot configuration, that is, one or more users configured with the same Group RNTI receive the same pilot sequence at the same port and the same time-frequency resource position, where the pilot may or may not include beam direction information.

The following illustrates a mapping relationship between the Group RNTI and the Group related information.

Example one

In this example, the group related information is beam information, and specifically, may be a beam identifier.

In this example, a mapping relationship exists between the Group RNTI and the beam information, and one beam direction corresponds to one Group RNTI under a certain beam width, or M beam directions correspond to one Group RNTI, where M is a positive integer greater than 1.

The base station configures a mapping table of Beam directions and all candidate Group RNTIs, for example, a Group RNTI with a value of X is corresponding to a Beam set { Beam1, …, Beam n }, a Group RNTI with a value of Y is corresponding to a Beam set { Beam n +1, …, Beam m }, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 2. Wherein Beam1 to Beam m are Beam IDs.

The base station may notify the terminal of the mapping table through RRC (Radio Resource Control) signaling or in a System message (MIB (Master Information Block), SIB1(System Information Block 1), SI (System Information). The UE can determine the specific value of the Group RNTI of the UE according to the current beam direction and the mapping table.

In another embodiment of the present invention, the mapping table may not be established, and the base station and the UE may calculate the GroupRNTI of the user group in which the UE is located according to the Beam ID (Beam identifier) corresponding to the specific Beam direction and a preconfigured functional relationship.

Example two

In this example, the Group related information is beam information and current time information, and the Group RNTI of the user Group in which the terminal is located is determined according to the beam information and the current time information. Wherein the current time information may be one of a current subframe number, a slot sequence number, a radio frame number, or a combination thereof.

In this example, the base station and the UE may agree in advance a functional relationship between the Beam identifier, the current radio frame number or subframe number, and the Group RNTI, and the base station and the UE may calculate and obtain the Group RNTI of the user Group in which the UE is located according to the Beam ID, the current radio frame number or subframe number, and the agreed functional relationship. The functional relationship may be: GroupRNTI ═ Beam ID + k; k is a constant and may have a value of 1, 61, or other positive integer.

Example three

In this example, the group related information is frequency domain sub-band information, where the frequency domain sub-band may be a sub-band corresponding to a downlink control channel or a sub-band corresponding to a downlink traffic channel.

In this example, the base station configures a mapping table of frequency domain Subband and all candidate Group RNTIs, e.g., Subband set SB1,. . . SBn corresponds to a Group RNTI of X, the Subband set { SB n +1, …, SB m } corresponds to a Group RNTI of Y, n is a positive integer of 1 or more, and m is a positive integer of 2 or more. Wherein SB1 to SB m are Subband IDs (Subband identifications), and divide a frequency domain range on one carrier into several subbands, and each Subband has a corresponding Subband ID.

The base station may inform the UE of the mapping table by RRC signaling or in a system message (MIB, SIB1, SI). The UE may determine the Group RNTI of the user Group in which the UE is located according to the current Subband and the mapping table. The current downlink control channel is a downlink traffic channel, and the current downlink control channel is a downlink traffic channel.

In other embodiments of the present invention, the base station and the UE may not send the mapping table to the UE, the base station and the UE agree in advance on a functional relationship between the sub-band ID and the Group RNTI, and the base station and the UE may determine the Group RNTI of the user Group in which the UE is located according to the current sub-band ID and the agreed functional relationship. For example, the functional relationship may be Group RNTI ═ sub band ID + k; k is a constant and may have a value of 1, 61, or other positive integer.

Example four

In this example, the group related information is Numerology (subcarrier spacing) information, and the Numerology information may be a Numerology ID corresponding to a downlink control channel or a Numerology ID corresponding to a downlink traffic channel.

In this embodiment, the base station configures a mapping table of Numerology and all candidate Group RNTIs, e.g., the Numerology set { Numerology1,. . . Numerology n corresponds to a Group RNTI with a value X, the Numerology set { Numerology n +1, …, Numerology m } corresponds to a Group RNTI with a value Y, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 2. Where, Numerology1 to Numerology m are Numerology IDs, the subcarrier intervals corresponding to different Numerology IDs are different, and the OFDM symbol lengths are different.

The base station may inform the UE of the mapping table by RRC signaling or in a system message (MIB, SIB1, SI). After receiving the mapping table, the UE may determine the GroupRNTI of the user group in which the UE is located according to the current Numerology information and the mapping table. The current Numerology information may be Numerology information of a current downlink control channel, or Numerology information of a current downlink traffic channel.

In another embodiment of the present invention, the mapping table may not be established, and the base station and the UE may agree in advance a functional relationship between the Numerology information and the Group RNTI, and determine the Group RNTI of the user Group in which the UE is located according to the specific current Numerology information and the agreed functional relationship. For example, the functional relationship may be Group RNTI ═ numerology id + k, k is a constant, and the value may be 1, 61, or other positive integer.

Example five

In this embodiment, the Group related information is slot structure information, and in this embodiment, the base station configures a mapping table between the slot structure information and all candidate Group RNTIs, and the base station may notify the UE of the mapping table through RRC signaling or in a system message (MIB, SIB1, SI). And the UE can determine the GroupRNTI of the user group in which the UE is located according to the current slot structure information and the mapping table.

In another embodiment of the present invention, the mapping table may not be established, and the base station and the UE may agree in advance on the mapping relationship between the slot structure information and the Group RNTI, and determine the Group RNTI according to the specific current slot structure information and the agreed mapping relationship.

Example six

In this embodiment, the Group related information may be one or more of Beam information, current time information, sub band information, and Numerology information, and the Group RNTI is calculated according to an agreed functional relationship, where the agreed functional relationship may be:

Group RNTI＝Beam ID+k+Subband ID；

or, Group RNTI ═ Beam ID + k + Numerology ID;

k is a constant, and the value can be 1, 61, or other positive integers, and the above functional relationship is only an example, and other functional relationships can be agreed as required.

Example seven

The base station determines a mapping relation table of the Group RNTI and the beam information, the notification bit of the RNTI is still 16 bits, and the Group RNTI uses a plurality of values originally reserved in the C-RNTI. In the mapping relationship between the Group RNTI and the beam information, the beam widths are different, and different beam IDs correspond to different Group RNTI values. As shown in table 1 or table 2 below, table 1 corresponds to the case where the Group RNTI values are not multiplexed under different beam widths, and table 2 corresponds to the case where the Group prnti values are multiplexed under different beam widths.

TABLE 1 mapping table of Group RNTI and Beam ID

TABLE 2 mapping table of Group RNTI and Beam ID

The base station informs the terminal of a mapping table of the beam and the Group RNTI through RRC signaling or SIB message, in the PDCCH region of each subframe, the terminal searches the mapping table according to the current state and current beam information if DCI expected to be received exists, determines the Group RNTI currently used by the terminal, and uses the Group RNTI to blindly detect all or part of the PDCCH search space. If the PDCCH is in the blind detection part of the search space, the terminal knows the mapping relation between the Group RNTI and the search space, namely the base station sends the mapping relation between the Group RNTI and the search space to the terminal.

Example eight

The base station configures a candidate Group RNTI set { Group RNTI1, Group prnti2, Group RNTI3} for the terminal through RRC signaling, and the base station also notifies the terminal of a corresponding relation table of different Group RNTIs and a blind detection search space through RRC signaling, as shown in table 3, table 4 or table 5 below.

Table 3: group RNTI and search space correspondence table

Table 4: group RNTI and search space correspondence table

Group RNTI value	Group search space CCE range
		Group RNTI1	CCE0-CCE9
Group RNTI2	CCE10—CCE19
		Group RNTI3	CCE20—CCE29
…	…

Table 5: group RNTI and search space correspondence table

In table 3, different CCE numbers are used to indicate different search space sizes, i.e. different Group RNTIs are used, and the search space sizes may be different.

In table 4, different Group RNTIs correspond to different CCE ranges.

In table 5, different Group RNTIs correspond to different search space time-frequency resources, the whole search space is divided into a plurality of small blocks, which may be time division or frequency division, and SPx represents different small block search spaces, such as SP0 to SP5 shown in fig. 4.

When the terminal uses the Group RNTI for blind detection, each Group RNTI in the candidate Group RNTI set is used for carrying out blind detection in the corresponding search space until the Group DCI of the user Group where the terminal is located is detected.

In other embodiments of the present invention, if there is no mapping relationship between the Group RNTI and the search space, when the terminal performs blind detection with the candidate Group RNTI set, the terminal may also perform blind detection in all or part of the PDCCH search space with each Group RNTI in the candidate Group RNTI set.

An embodiment of the present invention further provides a downlink control information sending apparatus, as shown in fig. 5, including:

a group radio network temporary identifier determining unit 501, configured to determine a group radio network temporary identifier corresponding to group downlink control information of a user group in which a terminal is located;

a processing unit 502, configured to perform cyclic redundancy check scrambling on the group of downlink control information by using the group of radio network temporary identifiers;

a sending unit 503, configured to send the scrambled set of downlink control information to the terminal through a physical downlink control channel.

In an embodiment of the present invention, the determining, by the group radio network temporary identifier determining unit 501, a group radio network temporary identifier corresponding to group downlink control information of a user group in which the terminal is located includes:

and determining group downlink control information of the user group in which the terminal is located according to the mapping relation information of the pre-configured group related information and the group wireless network temporary identifier.

In an embodiment of the present invention, the sending unit 503 is further configured to: and sending the mapping relation information to the terminal through radio resource control signaling or system information.

In another embodiment of the present invention, the group related information includes one or a combination of the following: the information of the beam carrying the group of downlink control information, the radio frame number of the radio frame carrying the group of downlink control information, the time slot number of the time slot carrying the group of downlink control information, the subframe number of the subframe carrying the group of downlink control information, the subband information of the downlink control channel carrying the group of downlink control information, the subband information of the downlink traffic channel related to the group of downlink control information, the subcarrier interval information of the downlink control channel carrying the group of downlink control information, the subcarrier interval information of the downlink traffic channel related to the group of downlink control information, and the time slot structure information of the predefined transmission time unit carrying the group of downlink control information.

In another embodiment of the present invention, the sending unit 503 is further configured to: configuring a candidate group wireless network temporary identifier set to the terminal through wireless resource control signaling;

the determining unit 501 for determining the group radio network temporary identifier corresponding to the group downlink control information of the user group in which the terminal is located includes: and selecting a group wireless network temporary identifier from the candidate group wireless network temporary identifier set as the group wireless network temporary identifier of the user group in which the terminal is positioned.

The embodiment of the invention also provides a base station which comprises the downlink control information sending device.

An embodiment of the present invention further provides a downlink control information detection apparatus, as shown in fig. 6, including:

a group radio network temporary identifier obtaining unit 601, configured to obtain a group radio network temporary identifier;

a blind detection unit 602, configured to perform blind detection in a search space of a physical downlink control channel by using the group of radio network temporary identifiers, and acquire group downlink control information of a user group in which the terminal is located.

In an embodiment of the present invention, the acquiring, by the group radio network temporary identifier acquiring unit 601, a group radio network temporary identifier includes:

In an embodiment of the present invention, the group radio network temporary identifier obtaining unit 601 is further configured to obtain the mapping relationship information according to the following manner: and receiving the mapping relation information from the base station, or agreeing the mapping relation information with the base station in advance.

In another embodiment of the present invention, the receiving, by the group radio network temporary identifier obtaining unit 601, the mapping relationship information from a base station includes: and receiving the mapping relation information sent by the base station through a wireless resource control signaling or a system message.

In a further embodiment of the present invention, the set of related information comprises one or a combination of the following: the group related information comprises one or a combination of the following: current beam information, current wireless frame number, current time slot serial number, current subframe number, current sub-band information of a downlink control channel, current sub-band information of a downlink service channel, current sub-carrier interval information of the downlink control channel, current sub-carrier interval information of the downlink service channel, and current time slot structure information of a predefined transmission time unit.

In still another embodiment of the present invention, the acquiring the group radio network temporary identifier by the group radio network temporary identifier acquiring unit 601 includes: receiving a candidate group wireless network temporary identifier set configured by a base station through a wireless resource control signaling, and acquiring each group wireless network temporary identifier in the group wireless network temporary identifier set;

the blind detection unit 602 performs blind detection in the search space of the physical downlink control channel by using the group of radio network temporary identifiers, and acquiring the group downlink control information of the user group in which the terminal is located includes:

the blind detection unit 602 performs blind detection in the search space of the physical downlink control channel by sequentially using the group radio network temporary identifiers in the candidate group radio network temporary identifier set until group downlink control information of the user group in which the terminal is located is acquired.

In another embodiment of the present invention, the blind detecting unit 602 performs blind detection in the search space of the pdcch, including:

or,

The embodiment of the invention also provides a terminal which comprises the downlink control information detection device.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for sending downlink control information comprises the following steps:

2. The method of claim 1,

the base station determining the group wireless network temporary identifier of the user group in which the terminal is located comprises the following steps: and the base station determines the group wireless network temporary identifier of the user group in which the terminal is positioned according to the mapping relation information of the group related information and the group wireless network temporary identifier which are configured in advance.

3. The method of claim 2, wherein the method further comprises: the base station sends the mapping relation information to the terminal through a wireless resource control signaling or a system message; or, the base station and the terminal agree the mapping relationship information in advance.

4. The method of claim 2, wherein the set of relevant information comprises one or a combination of: the information of the beam carrying the group of downlink control information, the radio frame number of the radio frame carrying the group of downlink control information, the time slot number of the time slot carrying the group of downlink control information, the subframe number of the subframe carrying the group of downlink control information, the subband information of the downlink control channel carrying the group of downlink control information, the subband information of the downlink traffic channel related to the group of downlink control information, the subcarrier interval information of the downlink control channel carrying the group of downlink control information, the subcarrier interval information of the downlink traffic channel related to the group of downlink control information, and the time slot structure information of the predefined transmission time unit carrying the group of downlink control information.

5. A downlink control information transmitting apparatus, comprising:

6. The apparatus of claim 5,

7. The apparatus of claim 6, wherein the sending unit is further configured to: and sending the mapping relation information to the terminal through radio resource control signaling or system information.

8. The apparatus of claim 6, wherein the group-related information comprises one or a combination of: the information of the beam carrying the group of downlink control information, the radio frame number of the radio frame carrying the group of downlink control information, the time slot number of the time slot carrying the group of downlink control information, the subframe number of the subframe carrying the group of downlink control information, the subband information of the downlink control channel carrying the group of downlink control information, the subband information of the downlink traffic channel related to the group of downlink control information, the subcarrier interval information of the downlink control channel carrying the group of downlink control information, the subcarrier interval information of the downlink traffic channel related to the group of downlink control information, and the time slot structure information of the predefined transmission time unit carrying the group of downlink control information.

9. A base station, characterized in that the base station comprises the downlink control information transmitting apparatus according to any one of claims 5 to 8.

10. A downlink control information detection method comprises the following steps:

11. The method of claim 10, wherein the terminal acquiring the group radio network temporary identity comprises: and the terminal determines the group wireless network temporary identifier of the user group in which the terminal is positioned according to the mapping relation information between the group related information and the group wireless network temporary identifier.

12. The method of claim 11, wherein the method further comprises the terminal obtaining the mapping relationship information by: and the terminal receives the mapping relation information from the base station, or the terminal and the base station agree on the mapping relation information in advance.

13. The method of claim 12, wherein the terminal receiving the mapping relationship information from the base station comprises: and the terminal receives the mapping relation information sent by the base station through a wireless resource control signaling or a system message.

14. The method of claim 11, wherein the set of related information comprises one or a combination of: current beam information, current wireless frame number, current time slot serial number, current subframe number, current sub-band information of a downlink control channel, current sub-band information of a downlink service channel, current sub-carrier interval information of the downlink control channel, current sub-carrier interval information of the downlink service channel, and current time slot structure information of a predefined transmission time unit.

15. The method of claim 10, wherein the terminal acquiring the group radio network temporary identity comprises: the terminal receives a candidate group wireless network temporary identifier set configured by a base station through a wireless resource control signaling, and acquires each group wireless network temporary identifier in the group wireless network temporary identifier set;

16. The method of claim 10, wherein the performing the blind detection in the search space of the physical downlink control channel using the set of radio network temporary identities comprises:

or,

17. A downlink control information detection apparatus includes:

18. The apparatus as claimed in claim 17, wherein said group radio network temporary identifier obtaining unit obtains the group radio network temporary identifier comprises:

19. The apparatus of claim 18, wherein the group radio network temporary identifier obtaining unit is further configured to obtain the mapping relationship information according to: and receiving the mapping relation information from the base station, or agreeing the mapping relation information with the base station in advance.

20. The apparatus as claimed in claim 19, wherein said group radio network temporary identity obtaining unit receiving said mapping relation information from a base station comprises: and receiving the mapping relation information sent by the base station through a wireless resource control signaling or a system message.

21. The apparatus of claim 18, wherein the group-related information comprises one or a combination of: current beam information, current wireless frame number, current time slot serial number, current subframe number, current sub-band information of a downlink control channel, current sub-band information of a downlink service channel, current sub-carrier interval information of the downlink control channel, current sub-carrier interval information of the downlink service channel, and current time slot structure information of a predefined transmission time unit.

22. The apparatus as claimed in claim 17, wherein said group radio network temporary identifier obtaining unit obtains the group radio network temporary identifier comprises: receiving a candidate group wireless network temporary identifier set configured by a base station through a wireless resource control signaling, and acquiring each group wireless network temporary identifier in the group wireless network temporary identifier set;

23. The apparatus of claim 17, wherein the blind detection unit performs blind detection in a search space of a physical downlink control channel, and comprises:

or,

24. A terminal, characterized in that the terminal comprises the downlink control information detecting apparatus according to any one of claims 17 to 23.