CN109076508A

CN109076508A - Transmit method, base station and the user equipment of signal

Info

Publication number: CN109076508A
Application number: CN201680084647.4A
Authority: CN
Inventors: 董朋朋; 段为明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-04-20
Filing date: 2016-04-20
Publication date: 2018-12-21
Also published as: WO2017181375A1

Abstract

The invention discloses a kind of method, base station and UE for transmitting signal.This method comprises: being mapped to the first CRS of first community on the first RE corresponding with the first CRS, the signal on the first RE is obtained, wherein the first RE has corresponding first auxiliary RE, and the signal on the first auxiliary RE is identical as the signal on the first RE；First control channel signal of first community is mapped on the 2nd RE corresponding with the 2nd CRS of second community, the signal on the 2nd RE is obtained, wherein the 2nd RE has corresponding second auxiliary RE, and the signal on the second auxiliary RE is identical as the signal on the 2nd RE；The signal on the signal and the second auxiliary RE on the signal and the 2nd RE on the signal and the first auxiliary RE on the first RE is weighted according to the orthogonal sequence of first community；Send signal on the first RE and the signal on the first auxiliary RE and the signal on the signal on the 2nd RE and the second auxiliary RE.The embodiment of the present invention is able to ascend demodulation performance.

Description

Method, base station and user equipment for transmitting signals

Technical Field

The present invention relates to the field of communications, and more particularly, to a method, a base station, and a user equipment for transmitting signals.

Background

The multi-cell symmetric multi-point transmission belongs to the category of downlink multi-cell cooperation, and the main idea is as follows: in order to avoid interference from adjacent cells, data of the same User Equipment (UE) is transmitted to the UE from more than one cell on the same frequency resource, the data of the multiple cells are independently encoded to form independent data streams for transmission, operations such as Hybrid Automatic Repeat reQuest (HARQ) and Adaptive Modulation and Coding (AMC) are independently performed, and the UE side jointly receives and demodulates the data of the multiple cells.

In order to support joint demodulation of multi-cell data well, collision between a Reference Signal (RS) and other channels, such as a Physical Downlink Shared Channel (PDSCH), is avoided, and RS orthogonality of multiple cells is ensured.

The RS is mainly divided into a Cell-specific Reference Signal (CRS) at a Cell level, and a demodulation Reference Signal (DMRS) and a Channel State Information Reference Signal (CSI-RS) at a user level. For the RS with Cell shift characteristics, for example, the positions of the CRS and CSI-RS are shifted according to different Cell identifiers (Cell IDs), so that the positions of the CRS and CSI-RS are different between different cells, and the RS and PDSCH collide with each other, thereby affecting the demodulation performance.

Disclosure of Invention

The embodiment of the invention provides a method for transmitting signals, a base station and user equipment, which can improve demodulation performance.

In a first aspect, a method for transmitting a signal is provided, including:

mapping a first cell-specific reference signal (CRS) of a first cell to first Resource Elements (REs) corresponding to the first CRS to obtain signals on the first REs, wherein the first REs are located in control channel symbols of transmission resources, the first REs have corresponding first auxiliary REs, and the signals on the first auxiliary REs are the same as the signals on the first REs;

mapping a first control channel signal of the first cell to a second RE corresponding to a second CRS of a second cell, to obtain a signal on the second RE, where the second cell is a cooperative cell of the first cell, the second RE is located in a control channel symbol of the transmission resource, the second RE has a corresponding second auxiliary RE, and the signal on the second auxiliary RE is the same as the signal on the second RE;

weighting signals on the first RE and signals on the first auxiliary RE according to the orthogonal sequence of the first cell;

weighting the signals on the second RE and the signals on the second auxiliary RE according to the orthogonal sequence of the first cell;

transmitting the signal on the first RE and the signal on the first auxiliary RE, and the signal on the second RE and the signal on the second auxiliary RE.

The method for transmitting the signal of the embodiment of the invention can realize the orthogonality of the reference signal of the cooperative cell by the auxiliary RE and the orthogonal sequence weighting, and does not influence the performance of channel estimation and the performance of a control channel, thereby improving the demodulation performance.

In some possible implementations, the orthogonal sequence of the first cell may be [ +1 +1], and the orthogonal sequence of the second cell may be [ + 1-1 ].

In some possible implementations, before transmitting the signal on the first RE and the signal on the first auxiliary RE, and the signal on the second RE and the signal on the second auxiliary RE, the method further includes:

scrambling signals on the first RE and signals on the first auxiliary RE;

scrambling signals on the second RE and signals on the second auxiliary RE.

Orthogonality of CRS of more than two cooperating cells may be achieved by scrambling.

In some possible implementations, the scrambling sequence may be either

In some possible implementations, for antenna port 0 or 1 and the transmission mode is not the transmission mode TM7, the first auxiliary RE and the second auxiliary RE are located in a first data channel symbol of a subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 0 or 1 and the transmission mode is TM7, the first auxiliary RE and the second auxiliary RE are located in the sixth symbol of the subframe of the transmission resource (it is understood that the symbol number of the sixth symbol is 5 here, since the symbol number starts numbering from 0); alternatively, the first and second electrodes may be,

for antenna port 2 or 3, the first auxiliary RE and the second auxiliary RE are located at the last control channel symbol of the subframe of the transmission resource.

In some possible implementations, the method further includes:

muting third auxiliary REs of third REs of the first cell corresponding to a third CRS, wherein the third REs are located in control channel symbols of the transmission resources, and the third CRS corresponds to different antenna ports than the first CRS.

By the scheme, CRS and auxiliary RE of different ports can not interfere with each other.

In some possible implementations, the method further includes:

mapping a fourth CRS of the first cell to a fourth RE corresponding to the fourth CRS, wherein the fourth RE is located in a data channel symbol of the transmission resource;

performing muting processing on fifth REs of the first cell corresponding to a fifth CRS of the second cell, wherein the fifth REs are located in data channel symbols of the transmission resources;

the signal on the fourth RE is transmitted.

By the scheme, the accuracy of channel estimation of each cell and the accuracy of joint noise interference correlation matrix (Ruu) estimation can be ensured, and the PDSCH of each cell is completely aligned, so that the joint demodulation technology of the UE side can be well performed.

In some possible implementations, the method further includes:

for the antenna port 5 and the transmission mode is TM7, mute processing is performed on a sixth RE of the first cell, where the sixth RE is an RE corresponding to the first demodulation reference signal DMRS of the second cell.

By the scheme, the orthogonality of the DMRS of each cell can be ensured.

In some possible implementations, the method further includes:

and carrying out orthogonal processing on a seventh RE and an eighth RE of the first cell according to the DMRS orthogonal sequence when the transmission mode is any one of TM8-10, wherein the seventh RE is an RE corresponding to the second DMRS of the first cell, and the eighth RE is an RE corresponding to the third DMRS of the second cell.

Through the scheme, the mutual orthogonality of the DMRSs of all the cells can be realized.

In some possible implementations, the method further includes:

and performing muting processing on a ninth RE of the first cell when the transmission mode is any one of TM8-10, wherein the ninth RE is an RE corresponding to the first CSI-RS of the second cell.

By the scheme, the orthogonality of the CSI-RS of each cell can be ensured.

In some possible implementations, the method further includes:

performing muting processing on a tenth RE of the first cell when the first cell and the second cell adopt different transmission modes, wherein the tenth RE is an RE corresponding to a Reference Signal (RS) of the second cell, and the RS comprises at least one of a CRS, a DMRS and a CSI-RS.

By the scheme, the RSs among the cells can be guaranteed to be orthogonal (not interfered with each other), and the PDSCH patterns of all the cells are guaranteed to be the same.

In a second aspect, a method of transmitting a signal is provided, including:

receiving signals on first resource elements, REs, corresponding to first cell-specific reference signals, CRSs, of a first cell and signals on first auxiliary REs of the first REs, wherein the first REs are located within control channel symbols of a transmission resource;

decorrelating signals received on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell;

and performing channel estimation of the first cell according to the decorrelated signal and the first CRS.

By the scheme, the orthogonality of the reference signals of the cooperative cells can be realized, the performance of channel estimation is not influenced, the performance of a control channel is not influenced, and the demodulation performance can be improved.

In some possible implementations, the method further includes:

descrambling the decorrelated signal;

the performing channel estimation of the first cell according to the decorrelated signal and the first CRS includes:

and performing channel estimation of the first cell according to the descrambled signal and the first CRS.

In some possible implementations, the method further includes:

descrambling the received signals on the first RE and the first auxiliary RE;

the decorrelating signals received on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell includes:

and performing decorrelation on the descrambled signal according to the orthogonal sequence of the first cell.

In some possible implementations, for antenna port 0 or 1 and the transmission mode is not the transmission mode TM7, the first auxiliary RE is located in the first data channel symbol of the subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 0 or 1 and the transmission mode is TM7, the first auxiliary RE is located in the sixth symbol of the subframe of the transmission resource (it is understood that the symbol number of the sixth symbol is 5 here, since the symbol number starts numbering from 0); alternatively, the first and second electrodes may be,

for antenna port 2 or 3, the first auxiliary RE is located at the last control channel symbol of the subframe of the transmission resource.

In some possible implementations, the method further includes:

receiving a signal on a fourth RE corresponding to a fourth CRS of the first cell, wherein the fourth RE is located within a data channel symbol of the transmission resource;

and performing channel estimation of the first cell according to the received signal on the fourth RE and the fourth CRS.

In some possible implementations, the method further includes:

receiving signals on second REs corresponding to a second CRS of a second cell and signals on second auxiliary REs of the second REs, wherein the second REs are located within control channel symbols of transmission resources;

decorrelating signals received on the second RE and the second auxiliary RE according to the orthogonal sequence of the second cell;

and performing channel estimation of the second cell according to the decorrelated signal and the second CRS.

In some possible implementations, the method further includes:

first control channel signals transmitted on the second RE and the second auxiliary RE, and second control channel signals transmitted on the first RE and the first auxiliary RE are acquired.

In a third aspect, a base station is provided that includes means for performing the method of the first aspect or any possible implementation manner of the first aspect.

In a fourth aspect, there is provided a UE comprising means for performing the method of the second aspect or any possible implementation manner of the second aspect.

In a fifth aspect, a base station is provided. The base station includes a processor, a memory, and a communication interface. The processor is coupled to the memory and the communication interface. The memory is for storing instructions, the processor is for executing the instructions, and the communication interface is for communicating with other network elements under control of the processor. The processor, when executing the instructions stored by the memory, causes the processor to perform the method of the first aspect or any possible implementation of the first aspect.

In a sixth aspect, a UE is provided. The UE includes a processor, a memory, and a communication interface. The processor is coupled to the memory and the communication interface. The memory is for storing instructions, the processor is for executing the instructions, and the communication interface is for communicating with other network elements under control of the processor. The processor, when executing the instructions stored by the memory, causes the processor to perform the second aspect or the method of any possible implementation of the second aspect.

In a seventh aspect, a computer-readable medium is provided for storing a computer program comprising instructions for performing the first aspect or the method in any possible implementation manner of the first aspect.

In an eighth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for performing the method of the second aspect or any possible implementation of the second aspect.

Drawings

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

Fig. 1 is a schematic diagram of a symmetric multipoint transmission scenario;

FIG. 2 is a schematic flow chart diagram of a method of transmitting a signal in accordance with an embodiment of the present invention;

fig. 3a is a CRS pattern of a first cell of an embodiment of the present invention;

fig. 3b is a CRS pattern of a second cell of an embodiment of the present invention;

FIG. 4a is a channel pattern of a first cell of an embodiment of the present invention;

FIG. 4b is a channel pattern of a second cell of an embodiment of the present invention;

FIG. 5 is a channel pattern of another embodiment of the present invention;

FIG. 6 is a channel pattern of yet another embodiment of the present invention;

FIG. 7 is a channel pattern of yet another embodiment of the present invention;

FIG. 8 is a channel pattern of yet another embodiment of the present invention;

FIG. 9 is a schematic block diagram of a base station of an embodiment of the present invention;

FIG. 10 is a schematic block diagram of a UE of an embodiment of the present invention;

fig. 11 is a schematic configuration diagram of a base station of another embodiment of the present invention;

fig. 12 is a schematic structural diagram of a UE according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the embodiment of the invention can be applied to a symmetric multipoint transmission scene. In a symmetric multipoint transmission scenario, multiple cells send independent data streams to the same UE on simultaneous frequency resources.

Fig. 1 is a schematic diagram of a symmetric multi-point transmission scenario to which the technical solution of the embodiment of the present invention can be applied. As shown in fig. 1, serving cells of three base stations 101, 102, and 103 are cooperative cells, and transmit independent data streams to UE 111 on the same time-frequency resource. The UE 111 receives the data sent by the three base stations 101, 102, and 103 on the time-frequency resource, and performs joint demodulation on the data of the three base stations 101, 102, and 103. In order to support the joint demodulation of multi-cell data well, collision between the RS among the multi-cells and other channels is avoided, and the RSs of the multiple cells are ensured to be orthogonal. The technical scheme of the embodiment of the invention supports the joint demodulation of the UE by setting the orthogonality of the RS of all the cells and the same mapping pattern of the PDSCH, and improves the demodulation performance, thereby finally improving the throughput performance of the UE in the scene.

In the embodiment of the present invention, a User Equipment (UE) may be referred to as a Terminal (Terminal), a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), and the like, and the User Equipment may communicate with one or more core networks through a Radio Access Network (RAN), for example, the User Equipment may be a Mobile phone (or referred to as a "cellular phone"), a computer with a Mobile Terminal, and the like, and for example, the User Equipment may also be a portable, pocket, handheld, computer-embedded, or vehicle-mounted Mobile device, and they exchange voice and/or data with the RAN.

In this embodiment of the present invention, the Base Station may be a Base Transceiver Station (BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), or may be a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), or may be an evolved Base Station (evolved Node B, eNB, or eNodeB) in Long Term Evolution (Long Term Evolution, LTE), which is not limited in this invention. For convenience of description, the following embodiments will be described by taking a base station eNB and a user equipment UE as examples.

Fig. 2 shows a schematic flow diagram of a method 200 of transmitting a signal according to an embodiment of the invention. In this embodiment of the present invention, the first cell and the second cell are cooperative cells, a base station of the first cell, which is hereinafter referred to as a first base station, and shown as a first base station 201 in fig. 2, and a base station of the second cell, which is hereinafter referred to as a second base station, and shown as a second base station 202 in fig. 2, may send independent data streams to the UE 203 on the same time-frequency resource. For example, the first base station 201 and the second base station 202 may be the base station 101 and the base station 102 in fig. 1, respectively.

It should be understood that the first base station 201 and the second base station 202 may be the same physical base station or different physical base stations, and the present invention is not limited thereto.

It should be understood that, in the embodiment of the present invention, the first cell and the second cell are taken as an example for description, but the present invention does not limit the number of cooperating cells. That is, in the case of more than two cells, each cell may refer to the processing manner of the first cell or the second cell.

211, the first base station 201 maps a first CRS of a first cell to a first Resource Element (RE) corresponding to the first CRS, to obtain a signal on a first RE, where the first RE is located in a control channel symbol of a transmission Resource, the first RE has a corresponding first auxiliary RE, and the signal on the first auxiliary RE is the same as the signal on the first RE.

The first few symbols of the radio frame, for example, the first three symbols, are mainly used for carrying control channel signals, and such symbols are called control channel symbols; similarly, other symbols of the radio frame that are primarily used to carry data channel signals are referred to as data channel symbols.

Optionally, the first base station 201 may first determine a first RE corresponding to a first CRS of a first cell in a control channel symbol of the transmission resource.

The first REs corresponding to the first CRS of the first cell in the control channel symbol may be obtained through a preset first cell CRS pattern.

For example, FIGS. 3a and 3b are of different cells

CRS pattern, where cell ID of cell of fig. 3a is 0 and cell ID of cell of fig. 3b is 1. In the embodiment of the present invention, the first cell adopts the CRS pattern of fig. 3a (cell ID is 0), and the second cell adopts the CRS pattern of fig. 3b (cell ID is 1).

As shown in fig. 3a, taking the CRS transmitted on the antenna port 0 as an example, the first RE corresponding to the first CRS of the first cell in the control channel symbol is symbol 0 and symbol 0 of subcarrier 6, and the following description takes subcarrier 0 as an example (similar processing may be applied to subcarrier 6), that is, the first RE is symbol 0 of subcarrier 0 as an example.

The first base station 201 maps the first CRS onto the first RE. The first RE is used to transmit a first CRS of a first cell.

Optionally, the first base station 201 determines a first auxiliary RE of the first RE, and copies the signal on the first RE to the first auxiliary RE, i.e. the signal on the first auxiliary RE is the same as the signal on the first RE. In the embodiment of the invention, CRSs of a plurality of cells are constructed to be orthogonal through the auxiliary REs.

Alternatively, for the location of the auxiliary RE, for different antenna ports (ports) and Transmission Modes (TM), the following settings may be adopted:

for antenna port 0 or 1 and the transmission mode is not TM7, the auxiliary RE is located at the first data channel symbol of the subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 0 or 1 and the transmission mode is TM7, the auxiliary RE is located in the sixth symbol of the subframe of the transmission resource (it is understood that the symbol number of the sixth symbol is 5 here, since the symbol number starts from 0); alternatively, the first and second electrodes may be,

for antenna port 2 or 3, the secondary RE is located at the last control channel symbol of the subframe of the transmission resource.

Specifically, for antenna Port 0/1, to protect the complete control channel, the auxiliary REs are placed within the first PDSCH symbol (possibly the 2 nd or 3 rd symbol, depending on the number of symbols of the control channel); for TM7 transmission mode, antenna Port 5 is fixedly adopted to transmit single stream beamforming (beamforming), and since DMRS of Port 5 occupies the position of the 3 rd symbol, auxiliary REs for CRS of antenna Port 0/1 in the control channel symbol are set in the 5 th symbol; for the antenna Port 2/3, if the Control Channel already occupies three symbols, the auxiliary RE is set in the 2 nd symbol (the last symbol of the Control Channel), and since the symbol carries a Physical Downlink Control Channel (PDCCH), and the PDCCH performs coding protection and is allocated according to the idle RE, the impact is small.

For example, as shown in fig. 4a, for Port 0 of the first cell, the auxiliary RE of the first RE (symbol 0 of subcarrier No. 0), i.e., the first auxiliary RE, is symbol 3 of subcarrier No. 0 (the first PDSCH symbol), i.e., the RE shown by "AR" in fig. 4 a. As shown in fig. 5, for Port 0 of the first cell and the transmission mode is TM7, the first auxiliary RE is symbol No. 5 of subcarrier No. 0, i.e., the RE shown as "AR" in fig. 5.

212, the first base station 201 maps the first control channel signal of the first cell to a second RE corresponding to a second CRS of a second cell, to obtain a signal on the second RE, where the second RE is located in the control channel symbol of the transmission resource, the second RE has a corresponding second auxiliary RE, and the signal on the second auxiliary RE is the same as the signal on the second RE.

The second cell is a cooperative cell of the first cell.

Optionally, the first base station 201 may first determine a second RE corresponding to a second CRS of a second cell in a control channel symbol of the transmission resource.

Similarly, the second REs corresponding to the second CRS of the second cell in the control channel symbol may be obtained through a preset CRS pattern of the second cell.

As shown in fig. 3b, taking the CRS transmitted on antenna port 0 as an example, the second RE corresponding to the second CRS of the second cell in the control channel symbol is symbol No. 1 and symbol No. 0 of subcarrier No. 7, and the following description takes subcarrier No. 1 as an example (similar processing may be applied to subcarrier No. 7), that is, the second RE is symbol No. 0 of subcarrier No. 1 as an example.

The first base station 201 maps the first control channel signal of the first cell onto the second RE.

On the second RE, the first cell transmits a control channel signal, e.g., a PDCCH signal.

Optionally, the first base station 201 determines a second auxiliary RE of the second RE, and copies the signal on the second RE to the second auxiliary RE, that is, the signal on the second auxiliary RE is the same as the signal on the second RE.

The location of the second auxiliary RE can refer to the related description in the previous step, and is not described herein again.

For example, as shown in fig. 4a, for Port 0 of the first cell, the secondary RE of the second RE (symbol 0 of subcarrier No. 1), i.e., the second secondary RE, is symbol No. 3 of subcarrier No. 1 (first PDSCH symbol), i.e., the RE shown by "AD" in fig. 4 a. As shown in fig. 5, for Port 0 of the first cell and the transmission mode is TM7, the second auxiliary RE is symbol No. 5 of subcarrier No. 1, i.e., the RE indicated by "AD" in fig. 5.

213, the first base station 201 weights the signal on the first RE and the signal on the first auxiliary RE according to the orthogonal sequence of the first cell.

The signals on the RE and the auxiliary RE are weighted by orthogonal sequences (which may also be referred to as orthogonal weighting sequences). The following description will be given by taking the weighting sequence shown in table 1 as an example.

TABLE 1

For the first cell, the signals on the first RE and the first auxiliary RE are:

wherein the superscript represents the cell ID, represents the signal on the first RE of the first cell, and represents the signal on the first auxiliary RE of the first cell.

The signals on the first RE and the first auxiliary RE weighted according to the orthogonal sequence of the first cell are:

214, the base station 201 weights the signal on the second RE and the signal on the second auxiliary RE according to the orthogonal sequence of the first cell.

Similar to step 213, the signals on the second RE and the second auxiliary RE weighted according to the orthogonal sequence of the first cell are:

wherein the signal on the second RE representing the first cell represents the signal on the second auxiliary RE of the first cell.

215, the base station 201 transmits the signal on the first RE and the signal on the first auxiliary RE, and the signal on the second RE and the signal on the second auxiliary RE.

In this step, the base station 201 transmits the processed signal.

Similarly, the second base station 202 also performs similar processing to the first base station 201. That is, the processing of the second base station 202 is equivalent to that of the first base station 201, and the only transformation between the two is the transformation of the positions of the respective REs.

221, the second base station 202 maps the second CRS of the second cell to a second RE corresponding to the second CRS, to obtain a signal on the second RE, where the second RE is located in a control channel symbol of the transmission resource, the second RE has a corresponding second auxiliary RE, and the signal on the second auxiliary RE is the same as the signal on the second RE.

Optionally, the second base station 202 may first determine a second RE corresponding to a second CRS of a second cell in a control channel symbol of the transmission resource.

As shown in fig. 3b, taking the CRS transmitted on the antenna port 0 as an example, the second REs corresponding to the second CRS of the second cell in the control channel symbol are No. 1 and No. 0 of the No. 7 subcarrier, and the following description will take the second RE as No. 0 of the No. 1 subcarrier as an example.

The second base station 202 maps the second CRS onto the second RE. The second RE is used to transmit a second CRS of the second cell.

Optionally, the second base station 202 determines a second auxiliary RE of the second RE, and copies the signal on the second RE to the second auxiliary RE, that is, the signal on the second auxiliary RE is the same as the signal on the second RE.

The location of the auxiliary RE can refer to the related description in the step, and is not described herein again.

For example, as shown in fig. 4b, for Port 0 of the second cell, the secondary RE of the second RE (symbol 0 of subcarrier No. 1), i.e., the second secondary RE, is symbol No. 3 of subcarrier No. 1 (first PDSCH symbol), i.e., the RE shown by "AR" in fig. 4 b.

222, the second base station 202 maps the second control channel signal of the second cell to a first RE corresponding to the first CRS of the first cell, to obtain a signal on the first RE, where the first RE is located in the control channel symbol of the transmission resource, the first RE has a corresponding first auxiliary RE, and the signal on the first auxiliary RE is the same as the signal on the first RE.

Optionally, the second base station 202 may first determine a first RE corresponding to a first CRS of a first cell in a control channel symbol of the transmission resource.

Similarly, the first REs corresponding to the first CRS of the first cell in the control channel symbol may be obtained through a preset CRS pattern of the first cell.

As shown in fig. 3b, taking the CRS transmitted on the antenna port 0 as an example, the first RE corresponding to the first CRS of the first cell in the control channel symbol is symbol 0 and symbol 0 of subcarrier 6, and the following description will take symbol 0 where the first RE is subcarrier 0 as an example.

The second base station 202 maps the second control channel signal of the second cell onto the first RE.

On the first RE, the second cell transmits a control channel signal, e.g., a PDCCH signal.

Optionally, the second base station 202 determines a first auxiliary RE of the first RE, and copies the signal on the first RE to the first auxiliary RE, that is, the signal on the first auxiliary RE is the same as the signal on the first RE.

For example, as shown in fig. 4b, for Port 0 of the second cell, the auxiliary REs of the first RE (subcarrier No. 0 of symbol No. 0), i.e., the first auxiliary REs, are the symbol No. 3 of subcarrier No. 0 (the first PDSCH symbol), i.e., the REs shown by "AD" in fig. 4 b.

223, the second base station 202 weights the signal on the second RE and the signal on the second auxiliary RE according to the orthogonal sequence of the second cell.

For the second cell, the signals on the second REs and the second auxiliary REs weighted according to the orthogonal sequence of the second cell are:

wherein the signals on the second RE of the second cell are represented and the signals on the second auxiliary RE of the second cell are represented.

224, the second base station 202 weights the signal on the first RE and the signal on the first auxiliary RE according to the orthogonal sequence of the second cell.

The signals on the first RE and the first auxiliary RE weighted according to the orthogonal sequence of the second cell are:

wherein the signal on the first RE representing the second cell represents the signal on the first auxiliary RE of the second cell.

225, the second base station 202 transmits the signal on the second RE and the signal on the second auxiliary RE, and the signal on the first RE and the signal on the first auxiliary RE.

In this step, the second base station 202 transmits the processed signal.

On the receiving side, the UE 203 may receive signals of the first base station 201 and the second base station 202 simultaneously.

231, the UE 203 receives signals on first REs corresponding to a first CRS of a first cell and signals on first auxiliary REs of the first REs, wherein the first REs are located within control channel symbols of a transmission resource.

Optionally, the UE 203 may determine first REs corresponding to the first CRS of the first cell and first auxiliary REs of the first REs in the control channel symbols of the transmission resources first.

The manner of determining the RE and the auxiliary RE is similar to that of the base station side, wherein the mapping pattern of the channel may be issued to the UE by the base station, or may be a fixed pattern agreed in advance by the base station and the UE.

For example, as shown in fig. 4a and 4b, the first RE is symbol No. 0 of subcarrier No. 0, and the first auxiliary RE is symbol No. 3 of subcarrier No. 0.

Both the base station 201 and the base station 202 transmit signals on the first RE and the first auxiliary RE, wherein the signal transmitted by the base station 201 is represented by the above equation (2), and the signal transmitted by the base station 202 is represented by the above equation (5).

Suppose that the first cell passes through a channel h₀The channel passed by the second cell is h₁Without considering additive white noise, the received signals of the UE 203 on the first RE and the first auxiliary RE are:

wherein the received signal on the first RE is indicated and the received signal on the first auxiliary RE is indicated.

232, the UE 203 decorrelates the received signal according to the orthogonal sequence of the first cell.

For the weighting process on the transmitting side, the UE 203 on the receiving side performs decorrelation according to the orthogonal sequence of the first cell, and specifically, see the following formula (7).

233, the UE 203 performs channel estimation of the first cell according to the decorrelated signal and the first CRS. After the orthogonal sequence of the first cell is decorrelated, the channel h of the first cell is obtained by multiplying the conjugate of CRS (first CRS) corresponding to the first cell₀Estimation of (2):

wherein the conjugate of the first CRS is represented.

Similarly, UE 203 may perform channel estimation for the second cell via signals on the second RE and the second auxiliary RE.

234, the UE 203 receives signals on a second RE corresponding to a second CRS of a second cell and signals on a second auxiliary RE of the second RE, wherein the second RE is located within a control channel symbol of the transmission resource.

Optionally, the UE 203 may first determine a second RE corresponding to a second CRS of a second cell in a control channel symbol of the transmission resource, and a second auxiliary RE of the second RE.

For example, as shown in fig. 4a and 4b, the second RE is symbol No. 0 of subcarrier No. 1, and the second auxiliary RE is symbol No. 3 of subcarrier No. 1.

On the second RE and the second auxiliary RE, both the base station 201 and the base station 202 transmit signals, where the signal transmitted by the base station 201 is as shown in equation (3) above, and the signal transmitted by the base station 202 is as shown in equation (4) above.

Suppose that the first cell passes through a channel h₀The channel passed by the second cell is h₁Without considering additive white noise, the received signals of the UE 203 on the second RE and the second auxiliary RE are:

wherein the received signal on the second RE is indicated and the received signal on the second auxiliary RE is indicated.

235, the UE 203 decorrelates the received signal according to the orthogonal sequence of the second cell.

For the weighting process at the transmitting side, the UE 203 at the receiving side performs decorrelation according to the orthogonal sequence of the second cell, and specifically, see the following equation (9).

236, the UE 203 performs channel estimation of the second cell according to the decorrelated signal and the second CRS. After the orthogonal sequence of the second cell is decorrelated, the channel h of the second cell is obtained by multiplying the conjugate of CRS (second CRS) corresponding to the second cell₁Estimation of (2):

wherein the conjugate of the second CRS is represented.

As can be seen from the above equations (7) and (9), after the scheme of the embodiment of the present invention is adopted, accurate channel estimation can be performed according to the jointly received signals of the first cell and the second cell.

After performing channel estimation on the first cell and the second cell, respectively, the UE 203 may further obtain a first control channel signal sent on the second RE and the second auxiliary RE, and a second control channel signal sent on the first RE and the first auxiliary RE, thereby implementing correct reception of the control channel signal and ensuring performance of the control channel.

Therefore, in the embodiment of the present invention, the first cell may normally send the control channel signal at the RE position corresponding to the CRS of the second cell, which does not affect the performance of channel estimation of the second cell, and does not need to mute the signal at the RE position corresponding to the CRS of the second cell, so that the performance of the control channel is not affected, and the demodulation performance can be improved.

Therefore, the method for transmitting signals according to the embodiment of the present invention can implement orthogonality of the reference signals of the cooperative cell by assisting the RE and the orthogonal sequence weighting, and does not affect the performance of channel estimation nor the performance of the control channel, thereby improving the demodulation performance.

Optionally, the base station may also scramble the transmitted signal to achieve more orthogonality of the reference signals between cooperating cells. That is, the base station of each cooperative cell scrambles the signal on the first RE and the signal on the first auxiliary RE, respectively; and scrambling signals on the second RE and signals on the second auxiliary RE.

Also taking the above two cells as an example, the scrambling sequence c₀ c₁]May consist of CRS sequences of two cells:

taking the sub-carrier No. 0 (the first RE and the first auxiliary RE) as an example, the first cell process is:

the second cell process is:

then the received signal on sub-carrier 0 is:

the process of adding scrambling sequence conjugate descrambling in channel estimation by the UE:

as can be seen from equation (14) above, scrambling has no effect on the channel estimates of the two cells, while achieving the effect of non-coherent accumulation on CRSs of other cells, which can further weaken the interference of other cooperative cell groups.

The scrambling method will change the original CRS and control channel RE values, so the UE needs to know the scrambling value to correctly perform channel estimation and control channel demodulation, and in order to make the scrambling transparent to the legacy UE, the scrambling values of CRS and control channel RE can be set to 1, so the scrambling sequence [ c ]₀ c₁]Can be as follows:

or:

i.e. the secondary REs are multiplied only by the scrambling value, which may be the CRS sequence value of the first cell or the second cell.

The scrambling of the base station and descrambling of the UE are optional steps. In addition, the scrambling and weighting of the base station, and the descrambling and decorrelation steps of the UE are linear operations, and the order may be switched.

Specifically, for example, the number 0 subcarriers (the first RE and the first auxiliary RE), after receiving the signal on the first RE and the signal on the first auxiliary RE, the UE may perform decorrelation on the received signal according to the orthogonal sequence of the first cell, then descramble the decorrelated signal, and then perform channel estimation of the first cell according to the descrambled signal and the first CRS; or, after receiving the signal on the first RE and the signal on the first auxiliary RE, the UE may descramble the received signal, perform decorrelation on the descrambled signal according to the orthogonal sequence of the first cell, and perform channel estimation of the first cell according to the decorrelated signal and the first CRS.

Optionally, in the case that an auxiliary RE is set, for each antenna Port, muting (muting) processing is also required for the transmission signals at the position of the auxiliary RE of other ports, so as to ensure that the CRS and the auxiliary RE of different ports do not interfere with each other.

Optionally, in an embodiment of the present invention, the first base station performs muting processing on a third auxiliary RE of a third RE of the first cell, where the third RE is located in a control channel symbol of the transmission resource, and the third CRS corresponds to a different antenna port than the first CRS.

Specifically, the third CRS may be a CRS of the first cell, or may be a CRS of the second cell, and the third CRS corresponds to a different antenna port from the first CRS. And the first base station determines a third auxiliary RE of a third RE corresponding to the third CRS, and performs a muted process on the third auxiliary RE.

For example, as shown in fig. 4a, the first CRS corresponds to Port 0, and the secondary RE corresponding to Port 1/2/3 needs to be muted, as shown in fig. 4 a. The REs shown in the figure indicate REs muted for auxiliary REs corresponding to CRSs on three ports 1, 2, and 3 of the own cell (first cell) and the cooperative cell (second cell). The muted REs are to avoid the cell port 0 transmitting signals at these RE locations from interfering with the signals at the auxiliary REs of the first or second cell at these RE locations.

Similarly, as shown in fig. 4b, the second CRS corresponds to Port 0, and the secondary RE corresponding to Port 1/2/3 needs to be muted, as shown in fig. 4 b.

The foregoing describes a method for processing CRS in control channel symbols of transmission resources by using auxiliary REs, and for CRS in data channel symbols of transmission resources, PDSCH REs at the position of other cooperative cells may be muted, so as to ensure that CRS of each cell is not interfered by signals of each cooperative cell, i.e., ensure orthogonality of CRS of each cell.

It should be understood that the manner of the auxiliary RE and the manner of the mutting may be implemented in combination or separately, and the present invention is not limited thereto.

Optionally, in an embodiment of the present invention, the first base station maps a fourth CRS of the first cell to a fourth RE corresponding to the fourth CRS, where the fourth RE is located in a data channel symbol of the transmission resource;

performing mutting processing on a fifth RE of the first cell corresponding to a fifth CRS of the second cell, wherein the fifth RE is located in a data channel symbol of the transmission resource;

the signal on the fourth RE is transmitted.

Specifically, taking the first cell as an example, the first base station determines a fourth RE corresponding to a fourth CRS of the first cell and a fifth RE corresponding to a fifth CRS of the second cell in a data channel symbol of the transmission resource;

mapping the fourth CRS to the fourth RE;

performing a mutting process on the fifth RE;

the signal on the fourth RE is transmitted.

It is to be understood that the transmission of the signal on the fourth RE may be the same transmission action as the transmission in step 215.

The fourth RE is a CRS RE of the first cell in the data channel symbol, the fifth RE is a RE of the first cell corresponding to the position of the CRS of the second cell in the data channel symbol, and the first base station maps the fourth CRS of the first cell to the fourth RE and performs a muting process on the fifth RE, thereby avoiding an interference to the fifth CRS of the second cell.

For example, as shown in fig. 4a, the REs corresponding to the CRS of the first cell in the data channel symbols are symbol 4 of the first slot of subcarrier 3 and 9, symbol 0 of the second slot of subcarrier 0 and 6, and symbol 4 of the second slot of subcarrier 3 and 9, the CRS is transmitted on these REs by the first cell, and the muted processing is performed on the REs corresponding to the position of the CRS in the data channel symbols of the second cell, as shown in fig. 4 a. The REs shown in the figure indicate REs muted by the own cell (first cell) for REs corresponding to CRSs of the cooperative cell (second cell) on four ports 0, 1, 2, and 3 within data channel symbols. The muted REs are to avoid interference of the CRS signals of the cooperating cells (second cells) at the RE positions caused by the transmission of signals at port 0 of the own cell (first cell) at the RE positions.

Accordingly, the second cell also performs similar processing as the first cell, i.e., mutes CRS REs within data channel symbols of the first cell.

On the receiving side, the UE receives signals on fourth REs corresponding to a fourth CRS of the first cell, wherein the fourth REs are located in data channel symbols of the transmission resource;

and performing channel estimation of the first cell according to the received signal and the fourth CRS.

Since the second cell mutes CRS REs (i.e., fourth REs) in data channel symbols of the first cell, the second cell does not interfere with CRS of the first cell, so that the UE can perform channel estimation of the first cell according to signals received on the fourth REs and the fourth CRS. Similarly, the UE may perform channel estimation for the second cell based on the signal received on the fifth RE and the fifth CRS.

Through the scheme, the CRS of each cell can be orthogonal, so that the accuracy of channel estimation of each cell and the accuracy of joint noise interference correlation matrix (Ruu) estimation are ensured, and meanwhile, the mutting process ensures that the PDSCHs of all the cells are all aligned, so that the joint demodulation technology of the UE side can be well carried out.

It should be understood that the secondary RE and muting operations of CRS need only be processed within the user bandwidth in the general case, but may be done for all users within the full bandwidth in order to further improve the CRS channel estimation quality of the users.

It should be understood that, for each cell, since the signaling operation (including the signaling operation in various embodiments of the present invention) may make the signal transmission power lower than that in the conventional manner, the saved power may be compensated to all REs of the entire transmission signal, thereby improving the received signal quality; or only compensate to the pilot (reference signal) RE (CRS, DMRS or CSI-RS), and improve the quality of channel estimation or CQI measurement.

The foregoing describes a method for processing a CRS, and when a DMRS has a cell shift characteristic, the DMRS may be muted on a PDSCH signal of a local cell at an RE position where DMRSs of other cooperating cells are located, so as to ensure that the DMRSs of other cooperating cells are not interfered by the signal of the local cell.

It should be understood that the processing of the CRS and the processing of the DMRS may be performed jointly or separately, and the present invention is not limited thereto.

Specifically, taking the first cell as an example, for the antenna port 5 and the transmission mode is TM7, the first base station performs a muting process on a sixth RE of the first cell, where the sixth RE is an RE corresponding to the first demodulation reference signal DMRS of the second cell, such as the RE shown in fig. 5. The REs shown in the figure indicate REs muted by the own cell (first cell) for the REs corresponding to the DMRS on port 5 of the cooperative cell (second cell). The muted REs are to avoid interference of the port 5 of the cell transmitting signals at these RE positions with the DMRS signals of the second cell at these RE positions.

Through the scheme, the DMRS of each cell can be guaranteed not to be interfered by signals of other cooperative cells.

In one embodiment of the present invention, optionally, for the transmission mode being any one of TM8-10, the first base station orthogonally processes a seventh RE and an eighth RE of the first cell according to the DMRS orthogonal sequence, where the seventh RE is a RE corresponding to the second DMRS of the first cell, and the eighth RE is a RE corresponding to the third DMRS of the second cell.

Specifically, because the DMRSs of TM8-10 are orthogonal sequences to ensure orthogonality, when all cells are in the TM8-10 mode, the inter-cell DMRS orthogonal sequence weighting operation may be performed according to a processing manner of intra-cell multi-layer transmission, that is, the DMRSs of each layer of all cells are configured to be orthogonal to each other by using the same set of DMRS orthogonal sequences, such as the RE shown in fig. 6 and 7. REs shown in fig. 6 and 7 represent REs orthogonally processed using DMRS orthogonal sequences.

For the CSI-RS, when having the cell shift characteristic, the PDSCH signal of the local cell at the RE position where the CSI-RS of other cooperating cells is located may be muted, so as to ensure that the CSI-RS of other cooperating cells is not interfered by the signal of the local cell.

It should be understood that the processing of the CRS, DMRS and CSI-RS may be performed jointly or separately, and the present invention is not limited thereto.

In an embodiment of the present invention, optionally, for a transmission mode of any of TM8-10, the first base station performs a muting process on a ninth RE of the first cell, where the ninth RE is an RE corresponding to the first CSI-RS of the second cell.

Specifically, taking the first cell as an example, for any transmission mode of TM8-10, the first base station determines a ninth RE in a data channel symbol of the transmission resource of the first cell;

and the first base station performs the mutting processing on the ninth RE.

For example, as shown in fig. 7, the first base station performs a muting process on REs of the first cell corresponding to the location of the CSI-RS of the second cell, such as the REs shown in fig. 7. In fig. 7, REs at Ax and Ay are REs corresponding to CSI-RS positions of the first cell, and REs at Bx and By are REs corresponding to CSI-RS positions of the second cell, and in order to avoid interference to CSI-RS of the second cell, the first base station mutes the REs at Bx and By.

By the scheme, the CSI-RS of each cell can be guaranteed not to be interfered by other cooperative cells.

In an embodiment of the present invention, optionally, when the first cell and the second cell employ different transmission modes, the first base station performs a muting process on a tenth RE of the first cell, where the tenth RE is a RE corresponding to an RS of the second cell, and the RS includes at least one of a CRS, a DMRS, and a CSI-RS.

Specifically, in a symmetric multipoint transmission scenario, different cells may select different TM modes to transmit data to the UE, for example, each cell independently performs Channel Quality Indicator (CQI) feedback, or the number of antennas configured in different cells is different, resulting in different numbers of antenna ports configured in two cooperating cells. For example, when one cell selects TM 1-6 transmission mode and another cell selects TM8-10 transmission mode, the TM 1-6 cell needs to mute PDSCH REs that interfere with DMRS of the TM8-10 cell, so as to ensure orthogonality of DMRS of the TM8-10 cell and also ensure that PDSCH of all cells are aligned, as shown in fig. 8. The REs shown in the figure indicate REs muted for REs corresponding to DMRSs of a cooperating cell. The muted REs are to avoid the own cell (first cell) transmitting signals at these RE locations from interfering with the DMRS signals of the second cell employing a different transmission mode at these RE locations.

For the situation of other various TM mode cooperations, the same principle is followed, and the PDSCH in the TM mode of each cell is muted at the RS (CRS, DMRS, or CSI-RS) position of the TM mode of the cooperating cell, so as to ensure that the RSs between cells are all orthogonal (do not interfere with each other), and ensure that the PDSCH patterns of all cells are the same.

It should be understood that the processing of various reference signals in the embodiments of the present invention may be implemented jointly or separately, and the present invention is not limited to this.

It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

It should be understood that the specific examples in the embodiments of the present invention are provided only to help those skilled in the art better understand the embodiments of the present invention, and do not limit the scope of the embodiments of the present invention.

Having described the method of transmitting a signal according to an embodiment of the present invention in detail above, a base station and a UE according to an embodiment of the present invention will be described below. It should be understood that the base station and the UE of the embodiment of the present invention may perform the foregoing methods of the embodiment of the present invention, that is, the following specific working processes of various apparatuses, and reference may be made to the corresponding processes in the foregoing method embodiments.

Fig. 9 shows a schematic block diagram of a base station 900 according to an embodiment of the invention. The base station 900 may be the base station in the foregoing method embodiments, for example, the first base station 201. As shown in fig. 9, the base station 900 includes:

a mapping module 910, configured to map a first cell-specific reference signal CRS of a first cell to a first resource element RE corresponding to the first CRS, so as to obtain a signal on a first RE, where the first RE is located in a control channel symbol of a transmission resource, the first RE has a corresponding first auxiliary RE, and the signal on the first auxiliary RE is the same as the signal on the first RE; mapping a first control channel signal of the first cell to a second RE corresponding to a second CRS of a second cell to obtain a signal on the second RE, where the second cell is a cooperative cell of the first cell, the second RE is located in a control channel symbol of the transmission resource, the second RE has a corresponding second auxiliary RE, and the signal on the second auxiliary RE is the same as the signal on the second RE;

a processing module 920, configured to weight the signals on the first RE and the signals on the first auxiliary RE according to the orthogonal sequence of the first cell, and weight the signals on the second RE and the signals on the second auxiliary RE according to the orthogonal sequence of the first cell;

a transmitting module 930 configured to transmit the signal on the first RE and the signal on the first auxiliary RE, and the signal on the second RE and the signal on the second auxiliary RE.

The base station of the embodiment of the invention can realize the orthogonality of the reference signals of the cooperative cells by assisting the RE and the orthogonal sequence weighting, and does not influence the performance of channel estimation and the performance of a control channel, thereby improving the demodulation performance.

In an embodiment of the present invention, optionally, the processing module 920 is further configured to scramble signals on the first RE and signals on the first auxiliary RE, and scramble signals on the second RE and signals on the second auxiliary RE.

In one embodiment of the present invention, optionally, for antenna port 0 or 1 and the transmission mode is not the transmission mode TM7, the first auxiliary RE and the second auxiliary RE are located in the first data channel symbol of the subframe of the transmission resource; alternatively, the first and second electrodes may be,

In an embodiment of the present invention, optionally, the processing module 920 is further configured to perform muting processing on a third auxiliary RE of a third RE of the first cell, where the third RE is located in a control channel symbol of the transmission resource, and the third CRS corresponds to a different antenna port than the first CRS.

In an embodiment of the present invention, optionally, the mapping module 910 is further configured to map a fourth CRS of the first cell to a fourth RE corresponding to the fourth CRS, where the fourth RE is located in a data channel symbol of the transmission resource;

the processing module 920 is further configured to perform a muting process on a fifth RE of the first cell corresponding to a fifth CRS of the second cell, where the fifth RE is located in a data channel symbol of the transmission resource;

the transmitting module 930 is further configured to transmit a signal on the fourth RE.

In an embodiment of the present invention, optionally, the processing module 920 is further configured to, for the antenna port 5 and the transmission mode is TM7, perform a muting process on a sixth RE of the first cell, where the sixth RE is an RE corresponding to the first demodulation reference signal DMRS of the second cell.

In an embodiment of the present invention, optionally, the processing module 920 is further configured to, for any transmission mode of TM8-10, orthogonally process a seventh RE and an eighth RE of the first cell according to the DMRS orthogonal sequence, where the seventh RE is a RE corresponding to the second DMRS of the first cell, and the eighth RE is a RE corresponding to the third DMRS of the second cell.

In an embodiment of the present invention, optionally, the processing module 920 is further configured to, for any transmission mode of TM8-10, perform a muting process on a ninth RE of the first cell, where the ninth RE is an RE corresponding to the first CSI-RS of the second cell.

In an embodiment of the present invention, optionally, the processing module 920 is further configured to perform a muting process on a tenth RE of the first cell when the first cell and the second cell employ different transmission modes, where the tenth RE is a RE corresponding to a reference signal RS of the second cell, and the RS includes at least one of a CRS, a DMRS, and a CSI-RS.

By the scheme, the accuracy of channel estimation of each cell and the accuracy of Ruu estimation can be ensured, and the PDSCH of each cell is also ensured to be completely aligned, so that the joint demodulation technology of the UE side can be well performed.

The base station 900 according to the embodiment of the present invention may correspond to the first base station in the method for transmitting a signal according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the base station 900 are respectively for implementing corresponding processes of each aforementioned method, and are not described herein again for brevity.

Fig. 10 shows a schematic block diagram of a UE 1000 according to an embodiment of the invention. The UE 1000 may be the UE in the foregoing method embodiment, for example, the UE 203. As shown in fig. 10, the UE 1000 includes:

a receiving module 1010, configured to receive a signal on a first resource element RE corresponding to a first CRS of a first cell and a signal on a first auxiliary RE of the first RE, where the first RE is located within a control channel symbol of a transmission resource;

a processing module 1020, configured to perform decorrelation on the received signals on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell, and perform channel estimation of the first cell according to the decorrelated signals and the first CRS.

In an embodiment of the present invention, optionally, the processing module 1020 is configured to descramble the decorrelated signal, and perform channel estimation of the first cell according to the descrambled signal and the first CRS.

In an embodiment of the present invention, optionally, the processing module 1020 is configured to descramble the received signals on the first RE and the first auxiliary RE, and perform decorrelation on the descrambled signals according to the orthogonal sequence of the first cell.

In one embodiment of the present invention, optionally, for antenna port 0 or 1 and the transmission mode is not the transmission mode TM7, the first auxiliary RE is located in the first data channel symbol of the subframe of the transmission resource; alternatively, the first and second electrodes may be,

In an embodiment of the present invention, optionally, the receiving module 1010 is further configured to receive a signal on a fourth RE corresponding to a fourth CRS of the first cell, where the fourth RE is located in a data channel symbol of the transmission resource;

the processing module 1020 is further configured to perform channel estimation of the first cell according to the received signal on the fourth RE and the fourth CRS.

The UE 1000 according to the embodiment of the present invention may correspond to the UE in the method for transmitting a signal according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the UE 1000 are respectively for implementing corresponding processes of the foregoing methods, and are not described herein again for brevity.

Fig. 11 shows a structure of a base station provided by another embodiment of the present invention, which includes at least one processor 1102 (e.g., CPU), at least one network interface 1105 or other communication interface, a memory 1106, and at least one communication bus 1103 for implementing connection communication between these devices. The processor 1102 is operable to execute executable modules, such as computer programs, stored in the memory 1106. Memory 1106 may comprise a high-speed Random Access Memory (RAM), and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection with at least one other network element is made through at least one network interface 1105 (which may be wired or wireless).

In some embodiments, the memory 1106 stores routines 11061 and the processor 1102 executes the routines 11061 for performing the methods of embodiments of the present invention previously described.

Fig. 12 shows a structure of a UE provided by a further embodiment of the present invention, which includes at least one processor 1202 (e.g., CPU), at least one network interface 1205 or other communication interface, a memory 1206, and at least one communication bus 1203 for implementing connection communication between these devices. The processor 1202 is operable to execute executable modules, such as computer programs, stored in the memory 1206. The Memory 1206 may comprise a Random Access Memory (RAM), and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection with at least one other network element is realized through at least one network interface 1205 (which may be wired or wireless).

In some embodiments, the memory 1206 stores the program 12061, and the processor 1202 executes the program 12061 for performing the methods of the embodiments of the invention described above.

It should be understood that, in the embodiment of the present invention, the term "and/or" is only one kind of association relation describing an associated object, and means that three kinds of relations may exist. For example, a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

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

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

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

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

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

A method of transmitting a signal, comprising:

mapping a first cell-specific reference signal (CRS) of a first cell to first Resource Elements (REs) corresponding to the first CRS to obtain signals on the first REs, wherein the first REs are located in control channel symbols of transmission resources, the first REs have corresponding first auxiliary REs, and the signals on the first auxiliary REs are the same as the signals on the first REs;

mapping a first control channel signal of the first cell to a second RE corresponding to a second CRS of a second cell, to obtain a signal on the second RE, where the second cell is a cooperative cell of the first cell, the second RE is located in a control channel symbol of the transmission resource, the second RE has a corresponding second auxiliary RE, and the signal on the second auxiliary RE is the same as the signal on the second RE;

weighting signals on the first RE and signals on the first auxiliary RE according to an orthogonal sequence of the first cell;

weighting signals on the second RE and signals on the second auxiliary RE according to an orthogonal sequence of the first cell;

transmitting the signal on the first RE and the signal on the first auxiliary RE, and the signal on the second RE and the signal on the second auxiliary RE.
The method of claim 1, wherein prior to the transmitting the signal on the first RE and the signal on the first auxiliary RE, and the signal on the second RE and the signal on the second auxiliary RE, the method further comprises:

scrambling signals on the first RE and signals on the first auxiliary RE;

scrambling signals on the second RE and signals on the second auxiliary RE.
The method of claim 1 or 2, wherein for antenna port 0 or 1 and a transmission mode other than TM7, the first and second auxiliary REs are located in a first data channel symbol of a subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 0 or 1 and a transmission mode of TM7, the first auxiliary RE and the second auxiliary RE are located in a sixth symbol of a subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 2 or 3, the first auxiliary RE and the second auxiliary RE are located at a last control channel symbol of a subframe of the transmission resource.
The method according to any one of claims 1 to 3, further comprising:

muting third auxiliary REs of third REs of the first cell corresponding to a third CRS, wherein the third REs are located within control channel symbols of the transmission resources, and the third CRS corresponds to a different antenna port than the first CRS.
The method according to any one of claims 1 to 4, further comprising:

mapping a fourth CRS of the first cell to a fourth RE corresponding to the fourth CRS, wherein the fourth RE is located within a data channel symbol of the transmission resource;

muting fifth REs of the first cell corresponding to a fifth CRS of the second cell, wherein the fifth REs are located within data channel symbols of the transmission resources;

transmitting a signal on the fourth RE.
The method according to any one of claims 1 to 5, further comprising:

for antenna port 5 and the transmission mode is TM7, muting sixth REs of the first cell, wherein the sixth REs are REs corresponding to a first demodulation reference signal, DMRS, of the second cell.
The method according to any one of claims 1 to 6, further comprising:

for any of transmission modes TM8-10, orthogonally processing a seventh RE and an eighth RE of the first cell according to a DMRS orthogonal sequence, wherein the seventh RE is a RE corresponding to the second DMRS of the first cell and the eighth RE is a RE corresponding to the third DMRS of the second cell.
The method according to any one of claims 1 to 7, further comprising:

muting ninth REs of the first cell for any one of transmission modes of TM8-10, wherein the ninth REs are REs corresponding to a first channel state information reference signal (CSI-RS) of the second cell.
The method according to any one of claims 1 to 8, further comprising:

muting a tenth RE of the first cell when the first cell and the second cell employ different transmission modes, wherein the tenth RE is an RE corresponding to a Reference Signal (RS) of the second cell, the RS including at least one of a CRS, a DMRS, and a CSI-RS.
A method of transmitting a signal, comprising:

receiving signals on first resource elements, REs, corresponding to a first cell-specific reference signal, CRS, of a first cell and signals on first auxiliary REs of the first REs, wherein the first REs are located within control channel symbols of a transmission resource;

decorrelating signals received on the first RE and the first auxiliary RE according to an orthogonal sequence of the first cell;

and performing channel estimation of the first cell according to the decorrelated signal and the first CRS.
The method of claim 10, further comprising:

descrambling the decorrelated signal;

the performing channel estimation of the first cell according to the decorrelated signal and the first CRS includes:

and performing channel estimation of the first cell according to the descrambled signal and the first CRS.
The method of claim 10, further comprising:

descrambling the received signals on the first RE and the first auxiliary RE;

the decorrelating signals received on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell comprises:

and performing decorrelation on the descrambled signal according to the orthogonal sequence of the first cell.
The method according to any of claims 10 to 12, wherein for antenna port 0 or 1 and the transmission mode is not transmission mode TM7, the first auxiliary RE is located in the first data channel symbol of the subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 0 or 1 and the transmission mode is TM7, the first auxiliary RE is located in the sixth symbol of the subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 2 or 3, the first auxiliary RE is located at a last control channel symbol of a subframe of the transmission resource.
The method according to any one of claims 10 to 13, further comprising:

receiving signals on fourth REs corresponding to a fourth CRS of the first cell, wherein the fourth REs are located within data channel symbols of the transmission resources;

and performing channel estimation of the first cell according to the received signal on the fourth RE and the fourth CRS.
A base station, comprising:

a mapping module, configured to map a first cell-specific reference signal CRS of a first cell to a first resource element RE corresponding to the first CRS, so as to obtain a signal on a first RE, where the first RE is located in a control channel symbol of a transmission resource, the first RE has a corresponding first auxiliary RE, and the signal on the first auxiliary RE is the same as the signal on the first RE; mapping a first control channel signal of the first cell to a second RE corresponding to a second CRS of a second cell to obtain a signal on the second RE, where the second cell is a cooperative cell of the first cell, the second RE is located in a control channel symbol of the transmission resource, the second RE has a corresponding second auxiliary RE, and the signal on the second auxiliary RE is the same as the signal on the second RE;

a processing module configured to weight signals on the first REs and signals on the first auxiliary REs according to an orthogonal sequence of the first cell, and weight signals on the second REs and signals on the second auxiliary REs according to an orthogonal sequence of the first cell;

a transmitting module, configured to transmit a signal on the first RE and a signal on the first auxiliary RE, and a signal on the second RE and a signal on the second auxiliary RE.
The base station of claim 15, wherein the processing module is further configured to scramble signals on the first RE and signals on the first auxiliary RE, and to scramble signals on the second RE and signals on the second auxiliary RE.
The base station of claim 15 or 16, wherein for antenna port 0 or 1 and a transmission mode other than TM7, the first and second auxiliary REs are located in a first data channel symbol of a subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 0 or 1 and a transmission mode of TM7, the first auxiliary RE and the second auxiliary RE are located in a sixth symbol of a subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 2 or 3, the first auxiliary RE and the second auxiliary RE are located at a last control channel symbol of a subframe of the transmission resource.
The base station of any of claims 15 to 17, wherein the processing module is further configured to mute a third auxiliary RE of a third RE of the first cell corresponding to a third CRS, wherein the third RE is located within a control channel symbol of the transmission resource, and wherein the third CRS corresponds to a different antenna port than the first CRS.
The base station according to any of claims 15 to 18, wherein the mapping module is further configured to map a fourth CRS of the first cell to a fourth RE corresponding to the fourth CRS, wherein the fourth RE is located within a data channel symbol of the transmission resource;

the processing module is further configured to mute a fifth RE of the first cell corresponding to a fifth CRS of the second cell, wherein the fifth RE is located within a data channel symbol of the transmission resource;

the transmitting module is further configured to transmit a signal on the fourth RE.
The base station according to any of claims 15 to 19, wherein said processing module is further configured to mute a sixth RE of the first cell for antenna port 5 and the transmission mode is TM7, wherein the sixth RE is an RE corresponding to the first demodulation reference signal, DMRS, of the second cell.
The base station of any of claims 15 to 20, wherein the processing module is further configured to, for any of the TM8-10 transmission modes, orthogonally process a seventh RE and an eighth RE of the first cell according to a DMRS orthogonal sequence, wherein the seventh RE is a RE corresponding to the second DMRS of the first cell and the eighth RE is a RE corresponding to the third DMRS of the second cell.
The base station according to any of claims 15 to 21, wherein the processing module is further configured to mute ninth REs of the first cell for any transmission mode of TM8-10, wherein the ninth REs are REs corresponding to first channel state information reference signals, CSI-RS, of the second cell.
The base station of any of claims 15 to 22, wherein the processing module is further configured to mute a tenth RE of the first cell when the first cell and the second cell employ different transmission modes, wherein the tenth RE is a RE corresponding to a reference signal, RS, of the second cell, and wherein the RS comprises at least one of a CRS, a DMRS, and a CSI-RS.
A User Equipment (UE), comprising:

a receiving module configured to receive signals on first Resource Elements (REs) corresponding to first cell-specific reference signals (CRSs) of a first cell and signals on first auxiliary REs of the first REs, wherein the first REs are located within control channel symbols of a transmission resource;

a processing module, configured to perform decorrelation on the received signals on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell, and perform channel estimation of the first cell according to the decorrelated signals and the first CRS.
The UE of claim 24, wherein the processing module is configured to descramble the decorrelated signal, and perform channel estimation for the first cell according to the descrambled signal and the first CRS.
The UE of claim 24, wherein the processing module is configured to descramble the received signals on the first RE and the first auxiliary RE, and wherein the descrambled signals are decorrelated according to the orthogonal sequence of the first cell.
The UE of any of claims 24 to 26, wherein for antenna port 0 or 1 and a transmission mode other than transmission mode TM7, the first auxiliary RE is located in a first data channel symbol of a subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 0 or 1 and the transmission mode is TM7, the first auxiliary RE is located in the sixth symbol of the subframe of the transmission resource; alternatively, the first and second electrodes may be,

for antenna port 2 or 3, the first auxiliary RE is located at a last control channel symbol of a subframe of the transmission resource.
The UE of any one of claims 24 to 27, wherein the receiving module is further configured to receive signals on fourth REs corresponding to fourth CRSs of the first cell, wherein the fourth REs are located within data channel symbols of the transmission resources;

the processing module is further configured to perform channel estimation of the first cell according to the received signal on the fourth RE and the fourth CRS.