CN103248469A

CN103248469A - Method and system for sending and detecting control signaling and demodulated pilot frequency, and base station

Info

Publication number: CN103248469A
Application number: CN201210024412XA
Authority: CN
Inventors: 戴博; 陈艺戬; 左志松
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-02-03
Filing date: 2012-02-03
Publication date: 2013-08-14
Anticipated expiration: 2032-02-03
Also published as: CN103248469B

Abstract

The invention discloses a method and a system for sending and detecting a control signaling and a demodulated pilot frequency, and a base station. The method includes the steps as follows: the base station maps sends the demodulated pilot frequency on M REs (Resource Elements) corresponding to a PRB (Physical Resource Block) according to a pattern mapped by the demodulated pilot frequency, wherein M represents a positive integer; the base station encodes and modulates the control signaling, maps the control signaling onto a resource with an REG (Resource Element Group) serving as a unit according to the pattern mapped by the determined control signaling and sends the control signaling; and a terminal detects the demodulated pilot frequency and the control signaling which are sent by the base station. With the adoption of the method and the system for sending and detecting the control signaling and the demodulated pilot frequency and the base station, the demodulating performance of the control signaling information can be guaranteed.

Description

Method, system and base station for sending and detecting control signaling and demodulation pilot frequency

Technical Field

The present invention relates to the field of communications, and in particular, to a method, a system, and a base station for transmitting and detecting control signaling and demodulation pilot.

Background

Orthogonal Frequency Division Multiplexing (OFDM) technology is essentially a multi-carrier modulation communication technology, which is one of the core technologies in fourth generation mobile communication (4G). In order to overcome the fading, the channel needs to be divided into a plurality of sub-channels in the frequency domain, the spectral characteristics of each sub-channel are approximately flat, and the sub-channels of the OFDM are orthogonal to each other, so that the frequency spectrums of the sub-channels are allowed to overlap with each other, and the frequency spectrum resources can be utilized to a large extent.

The Multiple-Input Multiple-Output (MIMO) technology can increase system capacity, improve transmission performance, and can be well integrated with other physical layer technologies, so that the MIMO technology becomes a key technology for super 3G (Beyond 3G, abbreviated as B3G) and 4G.

Long Term Evolution (LTE) system and LTE-advanced (LTE-a) are important plans of the third generation partnership organization, and both adopt OFDM technology and MIMO technology. Some brief descriptions are given below for LTE and LTE-a systems.

Fig. 1 is a schematic diagram of a frame structure of an LTE or LTE-a system Frequency Division Duplex (FDD) mode; fig. 2 is a frame structure diagram of a Time Division Duplex (TDD) mode of the LTE or LTE-a system.

In the frame structure of the FDD mode shown in fig. 1, a radio frame (radio frame) of 10ms is composed of twenty slots (slots) with the length of 0.5ms and the number of 0-19, and two adjacent slots constitute a subframe (subframe), as shown in fig. 1, slots 2i and 2i +1 constitute a subframe i with the length of 1ms, where i is a natural number.

In the frame structure of the TDD mode shown in fig. 2, a 10ms radio frame consists of two half-frames (half frames) of 5ms length, and one half-frame contains 5 subframes of 1ms length. Subframe i is defined as 2 slots 2i and 2i +1 of length 0.5ms, i being a natural number.

In the above two frame structures, when the system employs a Normal Cyclic Prefix (Normal CP), one slot contains up or down symbols of 7 lengths; when the system adopts the extended CP, one slot includes uplink or downlink symbols of 6 lengths, wherein the symbols are OFDM symbols.

One Resource Element (RE) is a subcarrier on one OFDM symbol, and one downlink Physical Resource Block (PRB) is composed of 12 consecutive subcarriers and 14 consecutive (12 when an extended cyclic prefix is used) OFDM symbols, and is 180kHz in the frequency domain and the time length of one general slot in the time domain, as shown in fig. 3.

In LTE and LTE-a systems, a Downlink Physical layer Control signaling includes DL Grant information and UL Grant information related to uplink transmission that a UE needs to acquire, and is used to indicate various transmission-related information such as a transmission resource location and a modulation and coding scheme, and the Physical layer Control signaling is transmitted on a Physical layer Control channel (PDCCH for short). In addition to transmitting some of the user-specific control signaling described above, the additional control channel is also used to transmit some common control signaling.

In Release 8/9 of LTE system and R10 of LTE-a system, a PDCCH for transmitting physical layer control signaling is generally configured and transmitted on the first N OFDM symbols, which are generally referred to as control signaling transmission regions.

Available transmission resources of an existing Control signaling transmission region are divided into a plurality of Control Channel Elements (CCEs), that is, resources occupied by Control information are allocated in units of CCEs, where a CCE may be further subdivided into a plurality of Resource Element groups (REGs for short), one CCE is composed of a plurality of discontinuous REGs, and is not necessarily in the same Physical Resource Block (PRB), generally 9 discontinuous REGs form one CCE, and each REG is further composed of a plurality of basic Resource units. Fig. 4 shows a REG diagram under 4CRS ports, and fig. 5 shows a REG diagram under 2CRS ports, where white padding represents second-type downlink control information, grid padding is first-type downlink control information, diagonal padding is

DMRS ports

7 and 8, dot padding is

DMRS ports

9 and 10, and digital padding is common demodulation pilot.

The dedicated and common control signaling are transmitted by taking the CCE as a resource unit, and then mapped to some corresponding discontinuous REG resources, and further mapped to REs of multiple PRBs.

The UE typically performs blind detection in the following manner:

and calculating the initial positions of the special control signaling and the public control signaling, and acquiring the size of the blind detection space according to the table 1.

TABLE 1

The blind detection process performed by the UE is shown in fig. 6, where black padding indicates the size of the blind detection space in CCE units.

In the later version of R10, in order to improve the transmission capacity of the control channel and support the control signaling of more users, design consideration is given to opening up a control signaling transmission region of a new version, and part of transmission resources are allocated in the original PDSCH transmission region of R8/9/10 to serve as the control signaling transmission region of the new version, so that the control signaling capacity is improved, the control signaling of more users is supported, the interference coordination can be better performed in the control signaling region of the new version, and the transmission performance of the control signaling is improved. Fig. 7 is a schematic diagram of a control signaling transmission area of a new version and an old version, where a grid is filled as the control signaling transmission area of the old version, a dot is filled as the control signaling transmission area of the new version, a white is filled as the data channel area available for all versions, and an oblique line is filled as the data channel area of the new version UE.

For convenience of description, the present invention refers to an old version of a control signaling transmission region as a first control region and a new version of the control signaling transmission region as a second control region. The second control region may support a Space Frequency Block Code (SFBC) for diversity technology, or may support a precoding technology, and the present invention mainly discusses the case of SFBC.

In the new version, in order to support the interleaving mode to obtain a larger frequency domain diversity gain, the definition of CCEs and REGs of the old version is still followed, and one REG is 4 adjacent REs in the frequency domain except for pilots on one OFDM symbol. When the number of dedicated demodulation pilot (DMRS) ports is 4, there is a case where 3 REs are one REG on a part of OFDM symbols, and when the number of DMRS ports is 2, there is a case where empty REs exist on a part of OFDM symbols, as shown in fig. 8.

The problems existing in the prior art are as follows: REGs composed of odd number of REs cannot be well matched with the coding requirements of SFBC; some empty REs in the PRB may cause waste of resources.

Disclosure of Invention

In view of this, the main objective of the present invention is to provide a method, a base station, and a system for transmitting and detecting control signaling and demodulation pilot, which can solve the problem that REGs composed of odd REs in the prior art cannot be well matched with the coding requirements of SFBC; some empty REs in the PRB may cause a waste of resources.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention discloses a method for sending and detecting a demodulation pilot frequency, which comprises the following steps:

the base station determines a demodulation pilot frequency mapping pattern;

the base station sends demodulation pilot frequency on M corresponding REs in the PRB according to the demodulation pilot frequency mapping pattern; m is a positive integer;

the terminal detects the demodulation pilot frequency sent by the base station according to the demodulation pilot frequency mapping pattern sent by the base station or a preset demodulation pilot frequency mapping pattern;

the demodulation pilot is a dedicated demodulation pilot (DMRS).

And when the M is 16, the base station determines the mapping pattern by adopting two groups of RE discrete mapping modes.

In the determined demodulation pilot mapping pattern, the time domain positions of the two groups of REs are:

within a PRB, one group of REs is located on the last two OFDM symbols of the 1 st slot, and another group of REs is located on the last two OFDM symbols of the 2 nd slot.

In the determined mapping pattern, the time domain positions of the two groups of REs are:

determined according to the time domain location where the PDSCH is located,

one group of REs is positioned on the first two OFDM symbols in the OFDM symbol where the PDSCH is positioned, and the other group of REs is positioned on the last two OFDM symbols of the PRB;

or, one group of REs is located on the 2 nd and 3 rd OFDM symbols in the OFDM symbol where the PDSCH is located, and the other group of REs is located on the last two OFDM symbols of the PRB;

or, one group of REs is located on the first two OFDM symbols of the OFDM symbols where the PDSCH is located, and the other group is located on the last two OFDM symbols of the OFDM symbols where the PDSCH is located.

In the determined mapping pattern, the time domain positions of the two groups of REs are: within the PRB, the PRB is a master-slave PRB,

one group of REs is located on the first two OFDM symbols of the second control region, and the other group of REs is located on the last two OFDM symbols of the second control region;

or, one group of REs is located on the 2 nd and 3 rd OFDM symbols of the second control region, and the other group of REs is located on the last two OFDM symbols of the second control region;

the second control area is a new version control signaling transmission area specified by an LTE or LTE-A system.

In the determined mapping pattern, the frequency domain positions of the two groups of REs are:

one group of REs is located on subcarriers with indexes h, h +3, h +6 and h +9, and the other group of REs is located on subcarriers with indexes h + x, h +3+ x, h +6+ x and h +9+ x; or, the two groups of REs are located on subcarriers of h, h +3, h +6 and h + 9; h is a natural number, and x is 1 or-1.

And when the M is 24, the base station determines the mapping pattern by adopting a three-group RE discrete mapping mode.

In the determined mapping pattern, the frequency domain positions of the three groups of REs are:

a group of REs are located on subcarriers indexed h, h +3, h +6, and h + 9; a group of REs are located on subcarriers with indices of h + x, h +3+ x, h +6+ x, and h +9+ x; a group of REs is located on subcarriers indexed h +2x, h +3+2x, h +6+2x, and h +9+2 x; or, three groups of REs are all located on subcarriers of h, h +3, h +6, and h + 9; h is a natural number, and x is 1 or-1.

The invention also provides a method for sending and detecting the control signaling, which comprises the following steps:

determining a control signaling mapping pattern;

the base station carries out coding modulation on the control signaling, and maps the control signaling to a resource with a Resource Element Group (REG) as a unit for sending according to the control signaling mapping pattern;

the terminal carries out blind detection on the control signaling sent by the base station based on the CCE consisting of the plurality of discontinuous REGs in the second control region;

the REG includes two REs or four REs.

When the REG contains two REs, determining a control signaling mapping pattern as: in a second control region of the PRB, after removing REs carrying demodulation pilots, taking two REs adjacent to a frequency domain position or a time domain position as the one REG; or,

when the REG contains four REs, determining a control signaling mapping pattern as: in a second control region of the PRB, after removing REs carrying demodulation pilots, taking four REs adjacent to a frequency domain position or a time domain position as the one REG;

The RE carrying the demodulation pilot comprises: dedicated demodulation pilot (DMRS) REs and/or public demodulation pilot REs.

Two REs are used as the one REG,

when the second control region of the PRB contains 24 or 16 DMRS REs, the determined control signaling mapping pattern is: two REs of all REGs in the PRB are adjacent in frequency domain position;

or, when the second control region of the PRB includes an even number of OFDM symbols, the determined control signaling mapping pattern is: two REs of all REGs in the PRB are adjacent in time domain position;

or, when the second control region of the PRB includes 12 DMRS REs, the determined control signaling mapping pattern is: within the PRB, two REs of a part of REGs are adjacent in time domain position, and two REs of another part of REGs are adjacent in frequency domain position.

When two REs of a part of REGs in the PRB are adjacent in time domain position and two REs of another part of REGs are adjacent in frequency domain position, the determined control signaling mapping pattern is:

in a second control region of the PRB, REGs composed of two REs adjacent in time domain position are located on the 6 th and 7 th OFDM symbols and the 13 th and 14 th OFDM symbols in the PRB, respectively, and are located on the 0 th and/or 11 th subcarriers; the rest are REGs composed of two REs adjacent in frequency domain position.

Four REs are used as the one REG,

when the second control region of the PRB contains 24 DMRS REs, the determined control signaling mapping pattern is: in four REs of each REG of the PRB, any RE has an RE adjacent to the time domain position, an RE adjacent to the frequency domain position and an RE neither adjacent to the time domain position nor adjacent to the frequency domain position;

or, when the second control region of the PRB includes 12 DMRS REs, the determined control signaling mapping pattern is: in four REs of a part of REGs of a PRB, any RE has an RE adjacent to the time domain position, an RE adjacent to the frequency domain position and an RE neither adjacent to the time domain position nor adjacent to the frequency domain position; four REs of another part REG are consecutive in time domain position;

or, the determined control signaling mapping pattern is: in four REs of a part of REGs of a PRB, any RE has an RE adjacent to the time domain position, an RE adjacent to the frequency domain position and an RE neither adjacent to the time domain position nor adjacent to the frequency domain position; the four REs of another portion of REGs are contiguous in frequency domain position.

When the control signaling is a public downlink control signaling, the PRB where the REG carrying the control signaling is located is:

n continuous PRBs in the system center bandwidth, or the front n PRBs and the back n PRBs in the system center bandwidth, or the n equally spaced PRBs; and n is a positive integer.

The present invention also provides a base station, comprising: an analysis unit, a mapping unit and a sending unit, wherein:

the analysis unit is used for determining a demodulation pilot frequency mapping pattern and a control signaling mapping pattern;

the mapping unit is configured to map, according to the demodulation pilot mapping pattern, a demodulation pilot on M corresponding REs in a PRB, where M is a positive integer; and mapping the control signaling to the resource with the REG as the unit according to the control signaling mapping pattern;

the sending unit is configured to send the demodulation pilot and the control signaling.

The mapping unit is further configured to map the DMRS to the corresponding M REs according to the demodulation pilot mapping pattern, and send the DMRS;

the analysis unit is further configured to determine a mapping pattern by using two groups of RE discrete mapping modes when M is 16; and when M is 24, determining the mapping pattern by adopting three groups of RE discrete mapping modes.

When M is 16, the analysis unit is also used for

In the determined demodulation pilot mapping pattern, the time domain positions of the two groups of REs are: within a PRB, one group of REs is located on the last two OFDM symbols of the 1 st slot, and another group of REs is located on the last two OFDM symbols of the 2 nd slot;

or, the time domain positions of the two groups of REs determined according to the time domain position of the PDSCH in the determined mapping pattern are: within a PRB, one group of REs is located on the first two OFDM symbols in the OFDM symbol where the PDSCH is located, and another group of REs is located on the last two OFDM symbols of the PRB; or, one group of REs is located on the 2 nd and 3 rd OFDM symbols in the OFDM symbol where the PDSCH is located, and the other group of REs is located on the last two OFDM symbols of the PRB; or, one group of REs is located on the first two OFDM symbols of the OFDM symbols where the PDSCH is located, and the other group is located on the last two OFDM symbols of the OFDM symbols where the PDSCH is located;

or, in the determined demodulation pilot mapping pattern, the time domain positions of the two groups of REs are: within the PRB, one group of REs is located on the first two OFDM symbols of the second control region, and another group of REs is located on the last two OFDM symbols of the second control region; alternatively, one group of REs is located on the 2 nd and 3 rd OFDM symbols of the second control region, and the other group of REs is located on the last two OFDM symbols of the second control region.

The analysis unit is further configured to determine, in the mapping pattern, frequency domain positions of the two groups of REs as: one group of REs is located on subcarriers with indexes h, h +3, h +6 and h +9, and the other group of REs is located on subcarriers with indexes h + x, h +3+ x, h +6+ x and h +9+ x; or, the two groups of REs are located on subcarriers of h, h +3, h +6 and h + 9; h is a natural number, and x is 1 or-1.

When M is 24, the analyzing unit is further configured to determine that, in the mapping pattern, the frequency domain positions of the three groups of REs are: a group of REs are located on subcarriers indexed h, h +3, h +6, and h + 9; a group of REs are located on subcarriers with indices of h + x, h +3+ x, h +6+ x, and h +9+ x; a group of REs is located on subcarriers indexed h +2x, h +3+2x, h +6+2x, and h +9+2 x; or, three groups of REs are all positioned on subcarriers of h, h +3, h +6 and h +9, wherein h is a natural number, and x is 1 or-1.

The analysis unit is further configured to determine, when the REG includes two REs, that the control signaling mapping pattern is: in a second control region of the PRB, after removing REs carrying demodulation pilots, taking two REs adjacent to a frequency domain position or a time domain position as the one REG; when the REG contains four REs, determining the control signaling mapping pattern as: in a second control region of the PRB, after removing REs carrying demodulation pilots, taking four REs adjacent to a frequency domain position or a time domain position as the one REG;

the RE carrying the demodulation pilot comprises: DMRS REs and/or common demodulation pilot REs.

The analysis unit is further configured to, when two REs are used as the one REG

The analysis unit is further configured to, when four REs are used as the one REG

The invention also provides a system for sending and detecting the demodulation pilot frequency and the control signaling, which comprises the base station and a terminal, wherein:

the terminal is used for receiving the demodulation pilot frequency and the control signaling sent by the base station and detecting the demodulation pilot frequency according to the demodulation pilot frequency mapping pattern sent by the base station or a preset demodulation pilot frequency mapping pattern; and the UE is further configured to perform blind detection on the control signaling based on the CCE consisting of the plurality of discontinuous REGs in the second control region.

The invention discloses a method, a base station and a system for sending and detecting a control signaling and a demodulation pilot frequency, wherein the method comprises the following steps: the base station sends demodulation pilot frequency on M corresponding REs in the PRB according to the demodulation pilot frequency mapping pattern, wherein a two-group RE discrete mapping mode is adopted when M is 16, and a three-group RE discrete mapping mode is adopted when M is 24, so that the condition of empty REs can be avoided;

in addition, the base station determines a control signaling mapping pattern according to the determined demodulation pilot mapping pattern; the base station carries out coding modulation on the control signaling, and maps the control signaling to the resource taking REG as a unit for sending according to the mapping pattern of the control signaling, wherein the REG comprises two or four REs, the mapping pattern avoids the problem that the REG formed by odd number of REs can not be well matched with the coding requirement of SFBC, and the demodulation performance of the control signaling is ensured.

Drawings

Fig. 1 is a frame structure diagram of an LTE or LTE-a system frequency division duplex mode;

FIG. 2 is a frame structure diagram of a TDD mode of an LTE or LTE-A system;

FIG. 3 is a schematic diagram of a PRB structure;

fig. 4 is a schematic diagram of REGs under 4CRS ports;

fig. 5 is a schematic diagram of REG under 2CRS ports;

FIG. 6 is a schematic diagram of a blind detection process;

FIG. 7 is a diagram of control signaling transmission areas of old and new versions;

FIG. 8 is a schematic diagram of REGs and empty REs composed of odd number of REs;

FIGS. 9-26 are diagrams illustrating control signaling mapping patterns according to embodiments of the present invention;

FIG. 27 is a flowchart illustrating a method for sending and detecting control signaling according to the present invention;

FIG. 28 is a schematic diagram of time domain position and frequency domain position adjacency;

FIG. 29 is a flowchart illustrating a method for transmitting and detecting demodulation pilots according to the present invention;

FIGS. 30-50 are diagrams illustrating exemplary demodulation pilot mapping patterns according to embodiments of the invention;

fig. 51 is a diagram illustrating the detection result of the terminal demodulating the pilot according to the present invention.

Detailed Description

The main ideas of the method for sending and detecting the control signaling provided by the invention are as follows: the control signaling is coded and modulated and is mapped to resources with the REG as a unit for sending; wherein, one REG contains two REs or four REs, as specifically shown in fig. 27, including:

step S1, the base station determines a control signaling mapping pattern;

step S2, the base station carries out coding modulation on the control signaling, and maps the control signaling to the resource with REG as the unit for sending according to the control signaling mapping pattern;

step S3, the terminal blindly detects the control signaling sent by the base station based on the CCE composed of multiple discontinuous REGs in the second control region.

Wherein, when the REG includes two REs, determining the control signaling mapping pattern according to the demodulation pilot mapping pattern as: in the second control region of the PRB, two REs adjacent to each other in the frequency domain or time domain are used as one REG after the REs carrying the demodulation pilots are removed.

Here, the REs carrying the demodulation pilot include DMRS REs and common demodulation pilot REs.

Preferably, the REG including two REs may be configured in the following three ways, i.e. the control signaling mapping pattern:

first, two REs of all REGs in a PRB are frequency-domain-location-adjacent, and at this time, the PRB satisfies: the second control region contains 24 or 16 DMRS REs;

two REs of all REGs in the PRB are time domain position neighbors, and at this time, the PRB satisfies: the second control region comprises an even number of OFDM symbols;

thirdly, two REs of one REG part of the PRB are adjacent in time domain position, and two REs of the other REG part of the PRB are adjacent in frequency domain position, and at this time, the PRB satisfies: the second control region contains 12 DMRS REs. In this case, the control signaling mapping pattern may be preferably: REGs composed of two REs adjacent in time domain position are respectively located on the 6 th and 7 th OFDM symbols and the 13 th and 14 th OFDM symbols in the PRB and are located on the 0 th and/or 11 th subcarriers; the rest are REGs consisting of two REs adjacent in the frequency domain.

When the REG contains four REs, determining the control signaling mapping pattern according to the demodulation pilot mapping pattern as: in the second control region of the PRB, four REs adjacent to the frequency domain position or the time domain position are set as one REG after the REs carrying the demodulation pilot are removed.

Preferably, the REG including four REs may be configured in the following three ways, i.e. the control signaling mapping pattern:

first, in four REs of each REG of a PRB, any RE includes one RE adjacent to its time-domain position, one RE adjacent to its frequency-domain position, and one RE neither adjacent to its time-domain position nor adjacent to its frequency-domain position, and at this time, the PRB satisfies: the second control region contains 24 DMRS REs;

any RE in four REs of a part of REGs of the PRB has an RE adjacent to the time domain position, an RE adjacent to the frequency domain position and an RE neither adjacent to the time domain position nor adjacent to the frequency domain position; four REs of another part of REGs are consecutive in time domain position, and at this time, the PRB satisfies: the second control region contains 12 DMRS REs;

thirdly, any RE in four REs of a part of REGs of the PRB has an RE adjacent to the time domain position, an RE adjacent to the frequency domain position and an RE which is neither adjacent to the time domain position nor adjacent to the frequency domain position; the four REs of another part of REGs are contiguous in frequency domain positions in such a way that there is no conditional restriction on PRBs.

It should be noted that the control signaling mapping pattern corresponding to the listed PRB (including two or four REs) satisfying a certain condition is only a preferred mapping pattern under the condition. When one PRB satisfies the above conditions, one of the corresponding mapping patterns may be selected, and each PRB needs to adopt the same mapping pattern.

After the REs carrying the demodulation pilots (including DMRS REs and/or common demodulation pilot REs) are removed, the REs with adjacent frequency domain positions or time domain positions are as shown in fig. 28: the A and a frequency domain positions are adjacent, the B and B frequency domain positions are adjacent, the C and C time domain positions are adjacent, the A and B time domain positions are adjacent, and the a and B time domain positions are adjacent.

The technical solution of the present invention will be described below by way of specific examples.

Before mapping, the base station needs to encode control signaling, such as DCI Format2C/2B/2A/2/1a/1C/0/4 defined in a protocol, add CRC bits, modulate by QPSK or other modulation methods (such as 16QAM), and then map to multiple CCEs. Wherein each CCE consists of a plurality of REGs, preferably some non-contiguous REGs.

It should be noted that the base station and the terminal need to negotiate the number of CCEs, such as 1eCCE, 2eCCE, 4eCCE, 8eCCE, etc., in advance, so that the base station can map resources more conveniently, and the terminal also performs blind detection on the sizes of several transmission resources more specifically.

Example one

This embodiment describes the case where the two REs of each REG within one PRB are both frequency-domain and adjacent when the second control region of the PRB contains 24 or 16 DMRS REs.

As shown in fig. 9, the second control region of the PRB includes 24 DMRS REs, and after the 24 DMRS REs (diagonally filled) and the common demodulation pilot (digitally filled) are removed, the two REs of each REG are adjacent in the average frequency domain position. Here, for the description aspect, the present invention collectively indicates the dedicated demodulation pilots (port7, 8 and port9, 10) by diagonal padding in the drawings of the specification, and the same in the subsequent embodiments.

As shown in fig. 10, the second control region of the PRB includes 24 DMRS REs, and after 24 DMRS REs are removed (diagonally filled), two REs per REG are adjacent in frequency domain position.

As shown in fig. 11, the second control region of the PRB includes 16 DMRS REs, and after removing the 16 DMRS REs (diagonally filled) and the common demodulation pilot (array filled), both REs of each REG are adjacent in frequency domain position.

Example two

This embodiment describes the case where both REs of each REG within a PRB are adjacent in time domain position when the second control region of the PRB contains an even number of OFDM symbols.

As shown in fig. 12, when the second control region of the PRB includes 12 OFDM symbols, the two REs of each REG are adjacent in the time domain position after removing the 12 DMRS REs (diagonally filled) included in the PRB.

As shown in fig. 13, when the second control region of the PRB includes 12 OFDM symbols, the two REs of each REG are adjacent in time domain position, except for 12 DMRS REs (diagonally filled) and common demodulation pilots (digitally filled) included in the PRB.

As shown in fig. 14, when the second control region of the PRB includes 10 OFDM symbols, 16 DMRS REs (diagonally filled) included in the PRB are removed, and then two REs of each REG are adjacent in time domain position.

As shown in fig. 15, when the second control region of the PRB includes 12 OFDM symbols, after removing 24 DMRS REs (diagonally filled) included in the PRB, two REs of each REG are both adjacent in time domain position.

EXAMPLE III

This embodiment describes the case where two REs of one part of REGs within one PRB are adjacent in time domain position and two REs of another part of REGs are adjacent in frequency domain position when 12 DMRS REs are contained within the PRB.

In the PRB shown in fig. 16, 17, 18, and 19, the second control region includes 12 DMRS REs, and after 12 DMRS REs are removed (hatched), two REs in one REG part are adjacent in time domain position, and two REs in the other REG part are adjacent in frequency domain position.

In practical applications, the setting shown in fig. 17 may be adopted, and the REGs composed of two REs with adjacent time domain positions are located on the 6 th and 7 th OFDM symbols and the 13 th and 14 th OFDM symbols in the PRB and located on the 0 th subcarrier; the rest are REGs consisting of two REs adjacent in the frequency domain.

In addition, this embodiment also shows a case where when the second control region of one PRB includes 24 dmrres, two REs of one part of REGs in the PRB are adjacent in time domain position, and two REs of the other part of REGs are adjacent in frequency domain position. In the PRB shown in fig. 20 and 21, the second control region includes 24 DMRS REs, and after 24 DMRS REs are removed (diagonally filled), two REs in one REG part are adjacent in time domain position, and two REs in the other REG part are adjacent in frequency domain position. However, in practical applications, for the convenience of mapping by the base station, when the second control region of one PRB includes 24 DMRS REs, the configuration shown in the first embodiment may be preferably adopted.

Example four

This embodiment describes three cases of the division manner of REGs in a PRB when one REG contains four REs.

As shown in fig. 22, in the PRB in which the second control region includes 24 DMRS REs, after 24 DMRS REs (filled with oblique lines) are removed, any RE in four REs in a part of REGs in the PRB includes one RE adjacent to its time-domain position, one RE adjacent to its frequency-domain position, and one RE neither adjacent to its time-domain position nor adjacent to its frequency-domain position; the four REs of another portion of REGs are contiguous in frequency domain position.

In the PRB shown in fig. 23, if the second control region of the PRB includes 24 DMRS REs, and after 24 DMRS REs (diagonally filled) and common demodulation pilots (digitally filled) are removed, any RE of four REs in a part of REGs in the PRB includes one RE adjacent to its time domain position, one RE adjacent to its frequency domain position, and one RE neither adjacent to its time domain position nor adjacent to its frequency domain position; the four REs of another portion of REGs are contiguous in frequency domain position.

As shown in fig. 24, in the PRB in which the second control region includes 16 DMRS REs, after 16 DMRS REs (diagonal padding) are removed, any RE in four REs of a part of REGs in the PRB includes one RE adjacent to its time-domain position, one RE adjacent to its frequency-domain position, and one RE neither adjacent to its time-domain position nor adjacent to its frequency-domain position; the four REs of another portion of REGs are contiguous in frequency domain position.

In the PRB shown in fig. 25, if the second control region includes 12 DMRS REs, and 12 DMRS REs (diagonal padding) are removed, any RE of four REs in a part of REGs in the PRB includes one RE adjacent to its time-domain position, one RE adjacent to its frequency-domain position, and one RE neither adjacent to its time-domain position nor adjacent to its frequency-domain position; the four REs of the other part REG are consecutive in time domain position.

As shown in fig. 26, in the PRB in which the second control region includes 24 DMRS REs, after 24 DMRS REs (hatched padding) are removed, any one RE among four REs in each REG in the PRB includes one RE adjacent to its time-domain position, one RE adjacent to its frequency-domain position, and one RE neither adjacent to its time-domain position nor adjacent to its frequency-domain position.

Based on the setting mode of the REG, the base station may map the common downlink control signaling. Wherein, the public downlink control signaling comprises: one or more of a downlink control signaling of the system message, a downlink control signaling of the paging message and a downlink control signaling of the random access feedback information.

In addition, the PRB where the REG carrying the common downlink control signaling is located needs to be preset, specifically: the PRB may be n continuous PRBs on the system center bandwidth, may also be the first n PRBs and the last n PRBs in the system bandwidth, and may also be n PRBs mapped at equal intervals, where n is a positive integer.

Further, the transmission mode of the public downlink control signaling is a diversity mode; and when the public downlink control signaling is the UE downlink control signaling, the PRB where the public downlink control signaling is located is the signaling configuration.

In addition, when the base station maps the control signaling to the REG, in order to avoid the situation that empty REs exist on OFDM symbols, the present invention further provides a method for sending demodulation pilots, as shown in fig. 29, including:

in step S1, the base station determines a demodulation pilot mapping pattern.

Step S2, the base station sends demodulation pilot frequency on M corresponding REs in PRB according to the demodulation pilot frequency mapping pattern; m is a positive integer;

step S3, the terminal detects the demodulation pilot sent by the base station according to the demodulation pilot mapping pattern sent by the base station or a preset demodulation pilot mapping pattern.

In mapping the demodulation pilot, the DMRS is preferably described in the embodiment of the present invention.

The following describes a method for determining a demodulation pilot mapping pattern by using a specific embodiment.

EXAMPLE five

In this embodiment, when M is 16, the base station determines the mapping pattern by using two groups of RE discrete mapping manners.

In both groups of REs:

for frequency domain positions, one group of REs is located on subcarriers with indices h, h +3, h +6, and h +9, and the other group of REs is located on subcarriers with indices h + x, h +3+ x, h +6+ x, and h +9+ x; h is a natural number, and x is 1 or-1, as shown in FIGS. 30, 31, 32, and 33. It can also be: both groups of REs are located on subcarriers of h, h +3, h +6, and h +9 as shown in fig. 34.

For the time domain positions, in two groups of REs: one set of REs is located on the last two OFDM symbols of the 1 st slot and the other set of REs is located on the last two OFDM symbols of the 2 nd slot, as shown in fig. 30, 31, 32, 33, 34.

EXAMPLE six

In both groups of REs:

for frequency domain positions, one group of REs is located on subcarriers with indices h, h +3, h +6, and h +9, and the other group of REs is located on subcarriers with indices h + x, h +3+ x, h +6+ x, and h +9+ x; h is a natural number, and x is 1 or-1, as shown in FIGS. 35, 36, 37, 38, and 41. It can also be: both groups of REs are located on subcarriers of h, h +3, h +6 and h +9 as shown in fig. 39, 40.

For the time domain positions, in two groups of REs: one set of REs is located on the first two OFDM symbols of the second control region, and the other set of REs is located on the last two OFDM symbols of the second control region, as shown in fig. 35, 36, 37, 38, and 39;

it can also be: one set of REs is located on the 2 nd and 3 rd OFDM symbols of the second control region, and the other set of REs is located on the last two OFDM symbols of the second control region, as shown in fig. 40 and 41.

In addition, the time domain position may also be determined according to the time domain position of the PDSCH:

in the PRB, when the time domain position where the PDSCH is located coincides with the second control region:

as shown in fig. 35, 36, 37, 38, and 39, one group of REs is located on the first two OFDM symbols of the OFDM symbol where the PDSCH is located, and another group of REs is located on the last two OFDM symbols of the PRB; or, one group of REs is located on the first two OFDM symbols of the OFDM symbols where the PDSCH is located, and the other group is located on the last two OFDM symbols of the OFDM symbols where the PDSCH is located;

as shown in fig. 41 and 41, one group of REs is located on the 2 nd and 3 rd OFDM symbols in the OFDM symbol where the PDSCH is located, and another group of REs is located on the last two OFDM symbols of the PRB;

when the time domain position of the PDSCH is not coincident with the second control region:

as shown in fig. 42 and 43, one group of REs is located on the first two OFDM symbols of the OFDM symbol where the PDSCH is located, and another group of REs is located on the last two OFDM symbols of the PRB; (the thick line frame region in the figure is the time domain position of PDSCH)

As shown in fig. 44 and 45, one set of REs is located on the first two OFDM symbols of the OFDM symbols on which the PDSCH is located, and the other set is located on the last two OFDM symbols of the OFDM symbols on which the PDSCH is located; (the thick line frame region in the figure is the time domain position of PDSCH)

As shown in fig. 46 and 47, one group of REs is located on the 2 nd and 3 rd OFDM symbols in the OFDM symbol where the PDSCH is located, and another group of REs is located on the last two OFDM symbols of the PRB. (the thick line frame region in the figure is the time domain position of PDSCH)

In addition, it can be seen from the demodulation pilot mapping patterns shown in fig. 35-47 that: the frequency domain position interval of each group of REs carrying demodulation pilots at the same time domain position is two subcarriers.

EXAMPLE seven

In this embodiment, when M is 24, the base station determines the mapping pattern by using three sets of RE discrete mapping.

In three groups of REs:

a group of REs are located on subcarriers indexed h, h +3, h +6, and h + 9; a group of REs are located on subcarriers with indices of h + x, h +3+ x, h +6+ x, and h +9+ x; a group of REs is located on subcarriers indexed h +2x, h +3+2x, h +6+2x, and h +9+2 x; h is a natural number, x is 1 or-1, as shown in FIGS. 48 and 49; it can also be: three groups of REs are all located on subcarriers of h, h +3, h +6, and h +9, as shown in fig. 50.

When the terminal detects the demodulation pilot, it may perform detection according to the demodulation pilot mapping pattern information sent by the base station, or according to the preset demodulation pilot mapping pattern information, to obtain a demodulation pilot mapping pattern demodulated by the terminal side, as shown in fig. 51, where B is a null RE. Wherein, the base station can inform the terminal of the demodulation pilot mapping pattern information through the high-layer RRC signaling. The demodulation pilot mapping pattern may include information such as the number of REs that the PRB carries the demodulation pilot, and a two-set RE discretization or three-set RE discretization mapping manner.

In order to implement the method for sending and detecting the demodulation pilot frequency and the control signaling, the invention provides a base station, which comprises the following steps: an analysis unit, a mapping unit and a sending unit, wherein:

an analysis unit for determining a demodulation pilot mapping pattern and a control signaling mapping pattern;

a mapping unit, configured to map, according to a demodulation pilot mapping pattern, a demodulation pilot on M corresponding REs in a PRB, where M is a positive integer; and mapping the control signaling to the resource with the REG as a unit according to the control signaling mapping pattern;

and the sending unit is used for sending the demodulation pilot frequency and the control signaling.

the analysis unit is further used for determining a mapping pattern by adopting two groups of RE discrete mapping modes when M is 16; and when M is 24, determining the mapping pattern by adopting three groups of RE discrete mapping modes.

When M is 16, the analysis unit is also used for

In the determined demodulation pilot mapping pattern, the time domain positions of two groups of REs are: within a PRB, one group of REs is located on the last two OFDM symbols of the 1 st slot, and another group of REs is located on the last two OFDM symbols of the 2 nd slot;

or, the time domain positions of the two groups of REs determined according to the time domain position where the PDSCH is located in the determined mapping pattern are: within a PRB, one group of REs is located on the first two OFDM symbols in the OFDM symbol where the PDSCH is located, and another group of REs is located on the last two OFDM symbols of the PRB; or, one group of REs is located on the 2 nd and 3 rd OFDM symbols in the OFDM symbol where the PDSCH is located, and the other group of REs is located on the last two OFDM symbols of the PRB; or, one group of REs is located on the first two OFDM symbols of the OFDM symbols where the PDSCH is located, and the other group is located on the last two OFDM symbols of the OFDM symbols where the PDSCH is located;

or, in the determined demodulation pilot mapping pattern, the time domain positions of two groups of REs are: within the PRB, one group of REs is located on the first two OFDM symbols of the second control region, and another group of REs is located on the last two OFDM symbols of the second control region; alternatively, one group of REs is located on the 2 nd and 3 rd OFDM symbols of the second control region, and the other group of REs is located on the last two OFDM symbols of the second control region.

The analysis unit is further configured to determine, in the mapping pattern, frequency domain positions of two groups of REs: one group of REs is located on subcarriers with indexes h, h +3, h +6 and h +9, and the other group of REs is located on subcarriers with indexes h + x, h +3+ x, h +6+ x and h +9+ x; or, the two groups of REs are located on subcarriers of h, h +3, h +6 and h + 9; h is a natural number, and x is 1 or-1;

and the ue is further configured to, in the determined mapping pattern, space the frequency domain position of each group of REs carrying the demodulation pilot at the same time domain position into two subcarriers.

When M is 24, the analyzing unit is further configured to determine that, in the mapping pattern, the frequency domain positions of three groups of REs are: a group of REs are located on subcarriers indexed h, h +3, h +6, and h + 9; a group of REs are located on subcarriers with indices of h + x, h +3+ x, h +6+ x, and h +9+ x; a group of REs is located on subcarriers indexed h +2x, h +3+2x, h +6+2x, and h +9+2 x; or, three groups of REs are all positioned on subcarriers of h, h +3, h +6 and h +9, h is a natural number, and x is 1 or-1.

An analyzing unit, further configured to determine, when the REG includes two REs, that the control signaling mapping pattern is: in a second control region of the PRB, two REs adjacent to each other in a frequency domain position or a time domain position are used as a REG after the REs carrying the demodulation pilot frequency are removed; when the REG contains four REs, determining the control signaling mapping pattern as: in a second control region of the PRB, removing REs bearing demodulation pilot frequency, and taking four REs adjacent to a frequency domain position or a time domain position as one REG;

the REs carrying the demodulation pilots include: DMRS REs and/or common demodulation pilot REs.

When two REs are taken as one REG, the analysis unit is also used for

When four REs are taken as one REG, the analysis unit is also used for

the terminal is used for receiving the demodulation pilot frequency and the control signaling sent by the base station and carrying out blind detection on the demodulation pilot frequency according to the demodulation pilot frequency mapping pattern sent by the base station or a preset demodulation pilot frequency mapping pattern; and the method is further used for performing blind detection on the control signaling based on the CCE consisting of the plurality of discontinuous REGs in the second control region.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A method for transmitting and detecting a demodulation pilot, the method comprising:

the base station determines a demodulation pilot frequency mapping pattern;

the demodulation pilot is a dedicated demodulation pilot (DMRS).

2. The method as claimed in claim 1, wherein when M is 16, the base station determines the mapping pattern by using two groups of RE discrete mapping.

3. The method as claimed in claim 2, wherein the time domain positions of the two groups of REs in the determined demodulation pilot mapping pattern are:

4. The method as claimed in claim 2, wherein the determined mapping pattern includes the time domain positions of the two groups of REs:

determined according to the time domain location where the PDSCH is located,

5. The method as claimed in claim 2, wherein the determined mapping pattern includes the time domain positions of the two groups of REs: within the PRB, the PRB is a master-slave PRB,

6. The method as claimed in any of claims 3 to 5, wherein the frequency domain positions of the two groups of REs in the determined mapping pattern are:

7. The method as claimed in claim 2, wherein when M is 24, the base station determines the mapping pattern by using three sets of RE discrete mapping.

8. The method as claimed in claim 7, wherein the frequency domain positions of the three groups of REs in the determined mapping pattern are:

9. A method for sending and detecting control signaling is characterized in that the method comprises the following steps:

determining a control signaling mapping pattern;

the REG includes two REs or four REs.

10. The method for transmitting and detecting control signaling according to claim 9,

11. The method of claim 10, wherein the REs carrying demodulation pilots comprise: dedicated demodulation pilot (DMRS) REs and/or public demodulation pilot REs.

12. The method of claim 11, wherein two REs are used as the one REG,

13. The method of claim 12, wherein when two REs of one part of REGs in the PRB are adjacent in time domain and two REs of another part of REGs are adjacent in frequency domain, the determined control signaling mapping pattern is:

14. The method of claim 13, wherein four REs are used as the one REG,

15. The method for sending and detecting the control signaling according to any one of claims 9 to 14, wherein when the control signaling is a public downlink control signaling, the PRB in which the REG carrying the control signaling is located is:

16. A base station, comprising: an analysis unit, a mapping unit and a sending unit, wherein:

17. The base station of claim 16, wherein the mapping unit is further configured to map the DMRS onto the corresponding M REs according to the demodulation pilot mapping pattern for transmission;

18. The base station of claim 17,

when M is 16, the analysis unit is also used for

19. The base station of claim 18, wherein the analyzing unit is further configured to determine the frequency domain positions of the two groups of REs in the mapping pattern as follows: one group of REs is located on subcarriers with indexes h, h +3, h +6 and h +9, and the other group of REs is located on subcarriers with indexes h + x, h +3+ x, h +6+ x and h +9+ x; or, the two groups of REs are located on subcarriers of h, h +3, h +6 and h + 9; h is a natural number, and x is 1 or-1.

20. The base station of claim 19,

21. The base station of claim 20,

22. The base station of claim 21, wherein the analyzing unit is further configured to use two REs as the one REG

23. The base station of claim 22, wherein the analyzing unit is further configured to analyze four REs as the one REG

24. A system for transmitting and detecting demodulation pilot and control signaling, comprising the base station according to any one of claims 16 to 23, the system further comprising a terminal, wherein: