WO2017181375A1 - Signal transmission method, base station and user equipment - Google Patents

Abstract

Disclosed are a signal transmission method, a base station and a UE. The method comprises: mapping a first CRS of a first cell to a first RE corresponding to the first CRS to obtain a signal on the first RE, wherein there is a first auxiliary RE corresponding to the first RE, and a 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, wherein there is a second auxiliary RE corresponding to the second RE, and a signal on the second auxiliary RE is the same as the signal on the second RE; weighting 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 according to an orthogonal sequence of the first cell; and sending 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 embodiments of the present invention can improve the demodulation performance.

Description

Method for transmitting signals, base station and user equipment Technical field

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

Background technique

The multi-cell symmetric multi-point transmission belongs to the category of downlink multi-cell cooperation. The main idea is: to avoid the interference from the neighboring cell, so that the data of the same user equipment (User Equipment, UE) is from the same frequency resource in more than one cell. Sending to the UE, independently encoding data of multiple cells, forming independent data stream transmission, independently performing Hybrid Automatic Repeat reQuest (HARQ), and Adaptive Modulation and Coding (AMC), etc. Operation, the UE side adopts joint reception to demodulate data of multiple cells.

In order to support the joint demodulation of multi-cell data well, it is necessary to avoid collision between multiple inter-cell reference signals (Responsive Signals, RSs) and other channels, such as Physical Downlink Shared Channel (PDSCH), and ensure multiple The RS of the cell is orthogonal.

The RS is mainly divided into a cell-specific Cell-specific Reference Signal (CRS), and a user-level De Modulation Reference Signal (DMRS) and a channel state information reference signal (Channel State Information Reference Signal). , CSI-RS). For an RS with cell shifting characteristics, for example, the positions of the CRS and the CSI-RS are offset according to different cell identifiers (Cell IDs), so the positions of CRSs and CSI-RSs between different cells are different, and RS and PDSCH may occur. The situation of collision, which affects demodulation performance.

Summary of the invention

The embodiments of the present invention provide a method for transmitting a signal, a base station, and a user equipment, which can improve demodulation performance.

In a first aspect, a method of transmitting a signal is provided, comprising:

Mapping a first cell-specific reference signal CRS of the first cell to a first resource element RE corresponding to the first CRS, to obtain a signal on the first RE, where the first RE is located in a 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;

Mapping the first control channel signal of the first cell to the second RE corresponding to the second CRS of the second cell, to obtain a signal on the second RE, where the second cell is a coordinated cell of the first cell The second RE is located in the control channel symbol of the transmission resource, and 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 the signal on the first RE and the signal on the first auxiliary RE according to an orthogonal sequence of the first cell;

Weighting the signal on the second RE and the signal on the second auxiliary RE according to an orthogonal sequence of the first cell;

Transmitting 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.

In the method for transmitting a signal according to the embodiment of the present invention, the reference signal of the coordinated cell is orthogonalized by the auxiliary RE and the orthogonal sequence weighting, which does not affect the performance of the channel estimation or the performance of the control channel, thereby improving the solution. Adjust performance.

In some possible implementation manners, 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 :

And scrambling the signal on the first RE and the signal on the first auxiliary RE;

The signal on the second RE and the signal on the second auxiliary RE are scrambled.

The orthogonality of CRSs of more than two cooperating cells can be achieved by scrambling.

或者

In some possible implementations, the scrambling sequence can be

or

In some possible implementations, for antenna port 0 or 1, and the transmission mode is not the transmission mode TM 7, the first secondary RE and the second secondary RE are located in the first data channel symbol of the subframe of the transmission resource; or,

For antenna port 0 or 1, and the transmission mode is TM 7, the first secondary RE and the second secondary RE are located in the sixth symbol of the subframe of the transmission resource (it is understood that here the sixth symbol The symbol number is 5 because the symbol number is numbered from 0); or,

For antenna port 2 or 3, the first secondary RE and the second secondary RE are located in the last control channel symbol of the subframe of the transmission resource.

In some possible implementations, the method further includes:

Performing a silent muting process on the third secondary RE of the third RE corresponding to the third CRS, where the third RE is located in a control channel symbol of the transmission resource, the third CRS and the first CRS Corresponding to different antenna ports.

Through the above scheme, it can be ensured that the CRS and the auxiliary RE of different ports do not interfere with each other.

In some possible implementations, the method further includes:

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

Performing a silent muting process on the fifth RE corresponding to the fifth CRS of the second cell, where the fifth RE is located in a data channel symbol of the transmission resource;

Send the signal on the fourth RE.

Through the above scheme, the accuracy of the channel estimation of each cell and the correctness of the joint noise interference correlation matrix (Ruu) estimation can be ensured, and the PDSCH of each cell is also fully aligned, so that the UE side joint can be well performed. Demodulation technology.

In some possible implementations, the method further includes:

For the antenna port 5, and the transmission mode is TM 7, the sixth RE of the first cell is subjected to a silent muting process, wherein the sixth RE is an RE corresponding to the first demodulation reference signal DMRS of the second cell.

Through the above scheme, the orthogonality of the DMRS of each cell can be guaranteed.

In some possible implementations, the method further includes:

For any transmission mode in which the transmission mode is TM 8-10, orthogonal processing is performed on the seventh RE and the eighth RE of the first cell according to the DMRS orthogonal sequence, where the seventh RE is the first cell and the first cell The second DMRS corresponds to the RE, and the eighth RE is an RE corresponding to the third DMRS of the second cell.

Through the above scheme, it is possible to realize that each layer of DMRSs of all cells are orthogonal to each other.

In some possible implementations, the method further includes:

Performing a silent muting process on the ninth RE of the first cell for any one of the transmission modes of the TM 8-10, where the ninth RE is the first channel state information reference signal CSI-RS with the second cell Corresponding RE.

Through the above scheme, the orthogonality of the CSI-RS of each cell can be guaranteed.

In some possible implementations, the method further includes:

When the first cell and the second cell adopt different transmission modes, performing a muting muting process on the tenth RE of the first cell, where the tenth RE is an RE corresponding to the reference signal RS of the second cell, where The RS includes at least one of CRS, DMRS, and CSI-RS.

Through the above scheme, it can be ensured that the RSs between cells are mutually orthogonal (not mutually interfered), and at the same time, the PDSCH patterns of all cells are guaranteed to be the same.

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

Receiving a signal on the first resource element RE corresponding to the first cell-specific reference signal CRS of the first cell and a signal on the first auxiliary RE of the first RE, where the first RE is located in a control channel of the transmission resource Inside the symbol;

De-correlating the received signal on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell;

Channel estimation of the first cell is performed according to the de-correlated signal and the first CRS.

Through the foregoing solution, orthogonality of the reference signals of the coordinated cells can be implemented, which does not affect the performance of the channel estimation or the performance of the control channel, thereby improving the demodulation performance.

In some possible implementations, the method further includes:

De-scrambling the de-correlated signal;

Performing the channel estimation of the first cell according to the de-correlated signal and the first CRS, including:

Channel estimation of the first cell is performed according to the descrambled signal and the first CRS.

In some possible implementations, the method further includes:

Desmuting the received signal on the first RE and the first auxiliary RE;

De-correlating the received signal on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell, including:

The descrambled signal is decorrelated 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 TM 7, the first secondary RE is located in the first data channel symbol of the subframe of the transmission resource; or

For antenna port 0 or 1, and the transmission mode is TM 7, the first secondary RE is located at the sixth symbol of the subframe of the transmission resource (it is understood that the symbol number of the sixth symbol here is 5 because Symbol numbers are numbered starting from 0); or,

For antenna port 2 or 3, the first secondary RE is located at the last subframe of the transmission resource. Control channel symbols.

In some possible implementations, the method further includes:

Receiving 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;

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 a signal on a second RE corresponding to a second CRS of the second cell and a signal on a second secondary RE of the second RE, where the second RE is located in a control channel symbol of the transmission resource;

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

Channel estimation of the second cell is performed according to the de-correlated signal and the second CRS.

In some possible implementations, the method further includes:

And acquiring 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.

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

In a fourth aspect, a UE is provided, comprising means for performing the method of the second aspect or any possible implementation 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 communication interface. The memory is for storing instructions for the processor to execute, and the communication interface is for communicating with other network elements under the control of the processor. When the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the first aspect or any of the possible implementations 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 communication interface. The memory is for storing instructions for the processor to execute, and the communication interface is for communicating with other network elements under the control of the processor. When the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of any of the possible implementations of the second aspect or the second aspect.

A seventh aspect, a computer readable medium for storing a computer program, the computer program comprising a method for performing the first aspect or any of the possible implementations of the first aspect Instructions.

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

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

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

2 is a schematic flowchart of a method for transmitting a signal according to an embodiment of the present invention;

FIG. 3a is a CRS pattern of a first cell according to an embodiment of the present invention; FIG.

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

4a is a channel diagram of a first cell according to an embodiment of the present invention;

4b is a channel diagram of a second cell according to an embodiment of the present invention;

Figure 5 is a channel diagram of another embodiment of the present invention;

6 is a channel pattern of still another embodiment of the present invention;

Figure 7 is a channel diagram of still another embodiment of the present invention;

Figure 8 is a channel diagram of still another embodiment of the present invention;

9 is a schematic block diagram of a base station according to an embodiment of the present invention;

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

11 is a schematic structural diagram of a base station according to 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 are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

The technical solution of the embodiment of the present invention can be applied to a symmetric multi-point transmission scenario. Symmetrical multipoint transmission In the transmission scenario, multiple cells send independent data streams to the same UE at the same time.

FIG. 1 is a schematic diagram of a symmetric multi-point transmission scenario in which the technical solution of the embodiment of the present invention is applicable. As shown in FIG. 1, the serving cells of the three base stations 101, 102, and 103 are cooperative cells, and respectively transmit independent data streams to the 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 jointly demodulates 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 multiple inter-cell RSs and other channels is avoided, and RS orthogonality of multiple cells is guaranteed. The technical solution of the embodiment of the present invention improves the throughput performance of the UE in the scenario by setting the orthogonality of the RSs of all the cells and the mapping pattern of the PDSCH to support the joint demodulation of the UE and improve the demodulation performance.

In the embodiment of the present invention, a user equipment (User Equipment, UE) may be referred to as a terminal, a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), etc., and the user equipment may be accessed through a radio access network. (Radio Access Network, RAN) communicates with one or more core networks, for example, the user equipment may be a mobile phone (or "cell phone"), a computer with a mobile terminal, etc., for example, the user equipment may also be portable , pocket, handheld, computer built-in or in-vehicle mobile devices that exchange voice and/or data with a wireless access network.

In the embodiment of the present invention, the base station may be a Global System of Mobile communication (GSM) or a Base Transceiver Station (BTS) in Code Division Multiple Access (CDMA), or may be a broadband. The base station (NodeB, NB) in the code division multiple access (WCDMA) may also be an evolved base station (Evolutional Node B, eNB or eNodeB) in Long Term Evolution (LTE). The invention is not limited. For convenience of description, the following embodiments will be described by taking a base station eNB and a user equipment UE as an example.

FIG. 2 shows a schematic flow diagram of a method 200 of transmitting a signal in accordance with an embodiment of the present invention. In the embodiment of the present invention, the first cell and the second cell are coordinated cells, and the base station of the first cell, hereinafter referred to as the first base station, is represented by the first base station 201 and the base station of the second cell in FIG. For the second base station, shown in FIG. 2 as the second base station 202, separate data streams can be sent to the UE 203 on the same time-frequency resource. For example, the first base station 201 and the second base station 202 can 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 It is a different physical base station, and the invention is not limited.

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 coordinated cells. That is to say, in the case of more than two cells, each cell can refer to the processing mode of the first cell or the second cell.

211. The first base station 201 maps the first CRS of the first cell to a first resource element (Resource Element, RE) corresponding to the first CRS, to obtain a signal on the first RE, where the first RE is located. Within 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.

The first few symbols of the radio frame, such as the first three symbols, are mainly used to carry control channel signals. Such symbols are called control channel symbols; similarly, other symbols of the radio frame that are mainly used to carry data channel signals are called data. Channel symbol.

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

The first RE corresponding to the first CRS of the first cell in the control channel symbol may be obtained by using a preset first cell CRS pattern.

For example, Figures 3a and 3b are for different cells.

The CRS pattern, in which the cell ID of the cell of FIG. 3a is 0, and the cell ID of the cell of FIG. 3b is 1. In the embodiment of the present invention, the first cell adopts the CRS pattern of FIG. 3a (the cell ID is 0), and the second cell adopts the CRS pattern of FIG. 3b (the cell ID is 1) as an example for description.

As shown in FIG. 3a, taking the CRS transmitted on the antenna port port 0 as an example, the first RE corresponding to the first CRS of the first cell in the control channel symbol is the 0th symbol of the 0th and 6th subcarriers, and the following is 0. The number of subcarriers is taken as an example (for similar processing of subcarrier No. 6), that is, the first RE is the No. 0 symbol of subcarrier No. 0 as an example.

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

Optionally, the first base station 201 determines the first secondary RE of the first RE, and copies the signal on the first RE to the first secondary RE, that is, the signal on the first secondary RE and the first RE The signals on the same are the same. In the embodiment of the present invention, the CRS orthogonal of a plurality of cells is constructed by the auxiliary RE.

Optionally, for the location of the secondary RE, for different antenna ports (Port) and transmission mode (TM), the following settings may be adopted:

For antenna port 0 or 1, and the transmission mode is not TM 7, the secondary RE is located in the transmission resource The first data channel symbol of the subframe; or,

For antenna port 0 or 1, and the transmission mode is TM 7, the secondary 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 here is 5 because the symbol number is from 0) Start numbering); or,

For antenna port 2 or 3, the secondary RE is located in the last control channel symbol of the subframe in which the resource is being transmitted.

Specifically, for antenna Port 0/1, in order to protect the complete control channel, the secondary RE is set in the first PDSCH symbol (possibly the second or third symbol, depending on the number of symbols of the control channel); 7 transmission mode, fixed antenna port 5 is used for single-beam beamforming. Since the DMRS of Port 5 occupies the position of the third symbol, the auxiliary RE of the CRS of the antenna port 0/1 in the control channel symbol is set. Within the fifth symbol; for antenna Port 2/3, if the control channel already occupies three symbols, the secondary RE is placed in the second symbol (the last symbol of the control channel), since the symbol carries the physical downlink control channel (Physical Downlink Control Channel, PDCCH), and the PDCCH is coded and will be allocated according to the idle RE, so the impact will be small.

For example, as shown in FIG. 4a, for Port 0 of the first cell, the secondary RE of the first RE (the 0th symbol of the 0th subcarrier), that is, the first secondary RE, is the 3rd symbol of the 0th subcarrier (the first One PDSCH symbol), that is, the RE shown by "AR" in Fig. 4a. As shown in FIG. 5, for Port 0 of the first cell, and the transmission mode is TM 7, the first secondary RE is the 5th symbol of the 0th subcarrier, that is, the RE indicated by "AR" in FIG.

212. The first base station 201 maps the first control channel signal of the first cell to the second RE corresponding to the second CRS of the second cell, to obtain a signal on the second RE, where the second RE is located. Within 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 coordinated cell of the first cell.

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

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

As shown in FIG. 3b, taking the CRS transmitted on the antenna port port 0 as an example, the second RE corresponding to the second CRS of the second cell in the control channel symbol is the No. 0 symbol of the subcarriers No. 1 and No. 7, below The subcarrier No. 1 is taken as an example for description (for the subcarrier No. 7 can be similarly processed), that is, the second RE is the No. 0 symbol of the subcarrier No. 1 as an example.

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

On the second RE, the first cell transmits a control channel signal, such as a PDCCH signal.

Optionally, the first base station 201 determines a second secondary RE of the second RE, and copies the signal on the second RE to the second secondary RE, that is, the signal on the second secondary RE and the second RE The signals on the same are the same.

For the location of the second auxiliary RE, refer to the related description in the foregoing steps, and details are 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 No. 1 of subcarrier No. 1), that is, the second secondary RE, is the No. 3 symbol of the subcarrier No. 1 (No. One PDSCH symbol), that is, the RE shown by "AD" in Fig. 4a. As shown in FIG. 5, for Port 0 of the first cell, and the transmission mode is TM 7, the second secondary RE is the fifth symbol of the subcarrier No. 1, that is, the RE indicated by "AD" in FIG.

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

The signals on the RE and the secondary RE are weighted by orthogonal sequences (which may also be referred to as orthogonal weighting sequences). The weighting sequence shown in Table 1 will be described below as an example.

Table 1

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

表示第一小区的第一RE上的信号，

表示第一小区的第一辅助RE上的信号。Wherein, the superscript indicates the cell ID,

Representing a signal on the first RE of the first cell,

A signal representing the first secondary 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 an orthogonal sequence of the first cell.

Similar to step 213, the second RE and the second auxiliary weighted according to the orthogonal sequence of the first cell The signal on the RE is:

表示第一小区的第二RE上的信号，

表示第一小区的第二辅助RE上的信号。among them,

Representing a signal on the second RE of the first cell,

A signal representing the second secondary RE of the first cell.

215. The base station 201 sends 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.

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

Similarly, the second base station 202 also performs processing similar to that of the first base station 201. That is to say, the processing of the second base station 202 and the first base station 201 are equivalent, and the transformation between the two is only the transformation of the position of the corresponding RE.

The second base station 202 maps the second CRS of the second cell to the second RE corresponding to the second CRS, and obtains 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.

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

As shown in FIG. 3b, taking the CRS transmitted on the antenna port port 0 as an example, the second RE corresponding to the second CRS of the second cell in the control channel symbol is the No. 0 symbol of the subcarriers No. 1 and No. 7, and the following The second RE is the No. 0 symbol of the No. 1 subcarrier as an example.

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

Optionally, the second base station 202 determines a second secondary RE of the second RE, and copies the signal on the second RE to the second secondary RE, that is, the signal on the second secondary RE and the second RE The signals on the same are the same.

For the location of the auxiliary RE, refer to the related description in the step, and details are 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 (the No. 0 symbol of the subcarrier No. 1), that is, the second secondary RE, is the No. 3 symbol of the subcarrier No. 1 (No. One PDSCH symbol), that is, the RE shown by "AR" in Fig. 4b.

222. The second base station 202 maps the second control channel signal of the second cell to the 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. Within the control channel symbol of the transmission resource, the first RE has a corresponding first auxiliary RE, 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 the first RE corresponding to the first CRS of the first cell in the control channel symbol of the transmission resource.

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

As shown in FIG. 3b, taking the CRS transmitted on the antenna port port 0 as an example, the first RE corresponding to the first CRS of the first cell in the control channel symbol is the 0th symbol of the 0th and 6th subcarriers, and the following An example in which an RE is a symbol No. 0 of subcarrier No. 0 is taken as an example.

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

On the first RE, the second cell transmits a control channel signal, such as a PDCCH signal.

Optionally, the second base station 202 determines the first secondary RE of the first RE, and copies the signal on the first RE to the first secondary RE, that is, the signal on the first secondary RE and the first RE The signals on the same are the same.

For the location of the auxiliary RE, refer to the related description in the step, and details are not described herein again.

For example, as shown in FIG. 4b, for Port 0 of the second cell, the secondary RE of the first RE (the 0th subcarrier of the 0th symbol), that is, the first secondary RE, is the 3rd symbol of the 0th subcarrier (the first One PDSCH symbol), that is, the RE shown by "AD" in Fig. 4b.

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

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

表示第二小区的第二RE上的信号，

表示第二小区的第二辅助RE上的信号。among them,

Representing a signal on the second RE of the second cell,

A signal representing a second secondary RE of the second cell.

224. The second base station 202 weights the signal on the first RE and the signal on the first auxiliary RE according to an 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:

表示第二小区的第一RE上的信号，

表示第二小区的第一辅助RE上的信号。 among them,

Representing a signal on the first RE of the second cell,

A signal representing the first secondary RE of the second cell.

225. The second base station 202 sends a signal on the second RE and a signal on the second auxiliary RE, and a signal on the first RE and a signal on the first auxiliary RE.

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

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

231. The UE 203 receives a signal on the first RE corresponding to the first CRS of the first cell and a signal on the first secondary RE of the first RE, where the first RE is located in a control channel symbol of the transmission resource.

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

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

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

The base station 201 and the base station 202 both transmit signals on the first RE and the first auxiliary RE. The signal transmitted by the base station 201 is as shown in the above formula (2), and the signal transmitted by the base station 202 is as shown in the above formula (5).

It is assumed that the channel through which the first cell passes is h ₀ and the channel through which the second cell passes is h ₁ . Regardless of additive white noise, the received signals of the UE 203 on the first RE and the first auxiliary RE are:

表示第一RE上的接收信号，

表示第一辅助RE上的接收信号。among them,

Representing the received signal on the first RE,

Indicates the received signal on the first secondary RE.

232. The UE 203 de-correlates the received signal according to the orthogonal sequence of the first cell.

Corresponding to 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. For details, refer to the following formula (7).

233. The UE 203 performs channel estimation of the first cell according to the de-correlated signal and the first CRS. After de-correlating according to the orthogonal sequence of the first cell, multiplying the conjugate of the CRS (first CRS) corresponding to the first cell to obtain an estimate of the channel h ₀ of the first cell:

表示第一CRS的共轭。 among them,

Indicates the conjugate of the first CRS.

Similarly, the UE 203 can perform channel estimation of the second cell by using signals on the second RE and the second secondary RE.

234. The UE 203 receives a signal on a second RE corresponding to a second CRS of the second cell and a signal on a second secondary RE of the second RE, where the second RE is located in a control channel symbol of the transmission resource.

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

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

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

On the second RE and the second secondary RE, both the base station 201 and the base station 202 transmit a signal, wherein the signal transmitted by the base station 201 is as shown in the above formula (3), and the signal transmitted by the base station 202 is as shown in the above formula (4).

Assuming that the channel through which the first cell passes is h ₀ and the channel through which the second cell passes is h ₁ , regardless of additive white noise, the received signals of the UE 203 on the second RE and the second secondary RE are:

表示第二RE上的接收信号，

表示第二辅助RE上的接收信号。among them,

Representing the received signal on the second RE,

Indicates the received signal on the second secondary RE.

235. The UE 203 de-correlates the received signal according to the orthogonal sequence of the second cell.

Corresponding to the weighting process on the transmitting side, the UE 203 on the receiving side performs decorrelation according to the orthogonal sequence of the second cell. For details, refer to the following formula (9).

236. The UE 203 performs channel estimation of the second cell according to the de-correlated signal and the second CRS. After de-correlating according to the orthogonal sequence of the second cell, multiplying the conjugate of the CRS (second CRS) corresponding to the second cell to obtain an estimate of the channel h ₁ of the second cell:

表示第二CRS的共轭。among them,

Indicates the conjugate of the second CRS.

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

After performing channel estimation on the first cell and the second cell, respectively, the UE 203 may further acquire the first control channel signal sent on the second RE and the second auxiliary RE, and the first sent on the first RE and the first auxiliary RE. The second control channel signal, thereby achieving correct reception of the control channel signal and ensuring the 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 location corresponding to the CRS of the second cell, which does not affect the performance of the channel estimation of the second cell, and does not need to be in the first cell. The signal at the RE location corresponding to the CRS of the second cell performs silent muting, and thus does not affect the performance of the control channel, thereby improving demodulation performance.

Therefore, in the method for transmitting a signal according to the embodiment of the present invention, the reference signal of the coordinated cell can be orthogonalized by the auxiliary RE and the orthogonal sequence weighting, and the performance of the channel estimation is not affected, nor the performance of the control channel is affected. Improve demodulation performance.

Optionally, the base station may further scramble the transmitted signal to implement orthogonality of more coordinated inter-cell reference signals. That is, the base station of each coordinated cell scrambles the signal on the first RE and the signal on the first auxiliary RE, respectively; and the signal on the second RE and the signal on the second auxiliary RE Perform scrambling.

Still taking the above two cells as an example, the scrambling sequence [c ₀ c ₁ ] can be composed of CRS sequences of two cells:

Taking the subcarrier 0 (the first RE and the first auxiliary RE) as an example, the first cell processing is:

The second cell is processed as:

Then the received signal on subcarrier 0 is:

The UE adds the scrambling sequence conjugate descrambling process to the channel estimation:

It can be seen from the above formula (14) that scrambling has no effect on the channel estimation of the two cells, and the CRS of other cells achieves the effect of non-coherent accumulation, and the other associations can be further weakened. Interference for the cell group.

The scrambling method changes the values of the original CRS and the control channel RE. Therefore, the UE needs to know the scrambling value to correctly perform channel estimation and control channel demodulation. In order to make the scrambling transparent to the legacy UE, the CRS and the control channel can be used. The scrambling value of RE is set to 1, so the scrambling sequence [c ₀ c ₁ ] can be:

or:

That is, only the auxiliary RE is multiplied 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 the descrambling step 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 all linear operations, and the order can be exchanged.

Specifically, taking the subcarrier 0 (the first RE and the first auxiliary RE) as an example, after receiving the signal on the first RE and the signal on the first auxiliary RE, the UE may first according to the first cell. Orthogonal sequence de-correlating the received signal, descrambling the de-correlated signal, and performing channel estimation of the first cell according to the descrambled signal and the first CRS; or, the UE receives the After the signal on the first RE and the signal on the first auxiliary RE, the received signal may be descrambled, and then the descrambled signal is de-correlated according to the orthogonal sequence of the first cell, and then The de-correlated signal and the first CRS perform channel estimation of the first cell.

Optionally, in the case that the auxiliary RE is set, for each antenna port, the transmission signal at the position of the auxiliary RE of the other port needs to be muted to ensure that the CRS and the auxiliary RE of different ports are both Will not interfere with each other.

Optionally, in an embodiment of the present invention, the first base station performs a silent muting process on the third secondary RE of the third RE corresponding to the third CRS, where the third RE is located in the transmission resource. Within the control channel symbol, the third CRS corresponds to the different antenna port of the first CRS.

Specifically, the third CRS may be a CRS of the first cell, or may be a CRS of the second cell, where the third CRS and the first CRS correspond to different antenna ports. The first base station determines a third secondary RE of the third RE corresponding to the third CRS, and performs a muting process on the third secondary RE.

所示的RE。图中

所示的RE表示为了 本小区(第一小区)和协作小区(第二小区)在端口1，2和3三个端口上的CRS所对应的辅助RE而静默的RE。该静默的RE是为了避免本小区端口0在这些RE位置上发射信号对这些RE位置上的第一小区或第二小区的辅助RE上的信号产生干扰。For example, as shown in FIG. 4a, the first CRS corresponds to Port 0, and the auxiliary RE corresponding to Port 1/2/3 needs to be muted, as shown in FIG. 4a.

The RE shown. In the picture

The RE shown is a RE that is silent for the secondary RE corresponding to the CRS on the three ports of the first cell and the coordinated cell (second cell) on the ports 1, 2 and 3. The silent RE is to prevent the local cell port 0 from transmitting signals at these RE locations to interfere with signals on the secondary cells of the first cell or the second cell at the RE locations.

所示的RE。Similarly, as shown in FIG. 4b, the second CRS corresponds to Port 0, and the auxiliary RE corresponding to Port 1/2/3 needs to be muted, as shown in FIG. 4b.

The RE shown.

The method for processing the CRS in the control channel symbol of the transmission resource by using the secondary RE is described above. For the CRS in the data channel symbol of the transmission resource, the PDSCH RE at the location of the other coordinated cell may be muted to ensure the priority of each cell. The CRS is not interfered by the signals of the respective coordinated cells, that is, the orthogonality of the CRS of each cell is guaranteed.

It should be understood that the manner of assisting the RE and the manner of muting may be implemented jointly or separately, and the present invention is not limited thereto.

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

Performing muting processing on the fifth RE corresponding to the fifth CRS of the second cell of the first cell, where the fifth RE is located in a data channel symbol of the transmission resource;

Send the signal on the fourth RE.

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

Mapping the fourth CRS to the fourth RE;

Performing a muting process on the fifth RE;

Send the signal on the fourth RE.

It should be understood that the transmission of the signal on the fourth RE and the transmission in step 215 may be the same transmission action.

The fourth RE is the CRS RE of the first cell in the data channel symbol, and the fifth RE is the RE of the first cell corresponding to the location of the CRS in the data channel symbol of the second cell, and the first base station is the first cell The four CRSs are mapped to the fourth RE, and the fifth RE is muted, thereby avoiding interference to the fifth CRS of the second cell.

所示的RE。图中

所示的RE表示本小区(第一小区)为了协作小区(第二小区)在端口0，1，2和3四个端口上的CRS在数据信道符号内所对应的RE而静默的RE。该静默的RE是为了避免本小区(第一小区)的端口0在这些RE位置上发射信号对这些RE位置上的协作小区(第二小区)的CRS信号产生干扰。For example, as shown in FIG. 4a, the RE corresponding to the CRS of the first cell in the data channel symbol is the 4th symbol of the first slot of the 3rd and 9th subcarriers, and the second of the 0th and 6th subcarriers. Symbol No. 0 of the slot, No. 4 symbol of the second slot of the subcarriers of No. 3 and No. 9, the first cell transmits the CRS on the REs, and the location of the CRS in the data channel symbols of the second cell The corresponding RE is muting, as shown in Figure 4a.

The RE shown. In the picture

The RE shown is the RE that the own cell (first cell) is silent for the coordinated cell (second cell) on the REs corresponding to the CRSs on the four ports of ports 0, 1, 2 and 3 in the data channel symbols. The silent RE is to prevent the port 0 of the local cell (first cell) from transmitting signals at these RE locations to interfere with the CRS signals of the coordinated cells (second cells) at the RE locations.

Correspondingly, the second cell also performs processing similar to the first cell, that is, performing muting processing on the CRS RE in the data channel symbol of the first cell.

On the receiving side, the UE receives a signal on a fourth RE corresponding to the fourth CRS of the first cell, where the fourth RE is located in a data channel symbol of the transmission resource;

Channel estimation of the first cell is performed according to the received signal and the fourth CRS.

Since the second cell performs muting processing on the CRS RE (ie, the fourth RE) in the data channel symbol of the first cell, the second cell does not form interference on the CRS of the first cell, so that the UE can be based on the fourth RE. The received signal and the fourth CRS perform channel estimation of the first cell. Similarly, the UE may perform channel estimation of the second cell according to the signal received on the fifth RE and the fifth CRS.

Through the above scheme, the CRS of each cell can be orthogonalized, thereby ensuring the accuracy of channel estimation of each cell and the correctness of the joint noise interference correlation matrix (Ruu) estimation, and the muting processing ensures that all PDSCHs of each cell are aligned. Therefore, the joint demodulation technique on the UE side can be performed well.

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

It should be understood that for each cell, since the muting operation (including the muting operation in various embodiments of the present invention) causes the signal transmission power to be lower than the conventional mode, the saved power can be compensated for all REs of the entire transmitted signal, and the reception is improved. Signal quality; it can also be compensated only to the pilot (reference signal) RE (CRS, DMRS or CSI-RS) to improve the quality of the channel estimation or CQI measurement.

The method for processing the CRS is described above. For the DMRS, when the cell shifting characteristic is available, the PDSCH signal of the local cell at the RE location where the DMRS of the other coordinated cell is located may be muted to ensure that the DMRS of other coordinated cells is not affected. The interference of the signal of the cell.

It should be understood that the processing of the CRS and the processing of the DMRS can be implemented jointly or separately. The invention is not limited thereto.

所示的RE。图中

所示的RE表示本小区(第一小区)为了协作小区(第二小区)在端口5上的DMRS所对应的RE而静默的RE。该静默的RE是为了避免本小区端口5在这些RE位置上发射信号对这些RE位置上的第二小区的DMRS信号产生干扰。Specifically, taking the first cell as an example, for the antenna port 5, and the transmission mode is TM 7, the first base station performs muting processing on the sixth RE of the first cell, where the sixth RE is the same as the second cell. Demodulating the RE corresponding to the reference signal DMRS, as shown in FIG.

The RE shown. In the picture

The RE shown is an RE that is silenced by the own cell (first cell) for the RE corresponding to the DMRS of the coordinated cell (second cell) on port 5. The silent RE is to prevent the local cell port 5 from transmitting signals at these RE locations to interfere with the DMRS signal of the second cell at these RE locations.

Through the above scheme, it can be ensured that the DMRS of each cell is not interfered by signals of other coordinated cells.

In an embodiment of the present invention, optionally, for any one of the transmission modes, the first base station orthogonalizes the seventh RE and the eighth RE of the first cell according to the DMRS orthogonal sequence. Processing, where the seventh RE is an RE corresponding to a second DMRS of the first cell, and the eighth RE is an RE corresponding to a third DMRS of the second cell.

所示的RE。图6和图7中

所示的RE表示采用了DMRS正交序列进行正交处理的RE。Specifically, since the DMRS of the TM 8-10 ensures orthogonality by using an orthogonal sequence, when all the cells are in the TM8-10 mode, the inter-cell DMRS orthogonality can be performed according to the processing manner of the multi-layer transmission in the cell. Sequence weighting operation, that is, using the same set of DMRS orthogonal sequences to configure each layer of each layer of DMRS to be orthogonal to each other, as shown in FIG. 6 and FIG. 7

The RE shown. Figure 6 and Figure 7

The RE shown shows an RE that is orthogonally processed using a DMRS orthogonal sequence.

For the CSI-RS, when the cell shifting characteristic is available, the PDSCH signal of the local cell at the RE location where the CSI-RSs of other coordinated cells are located may be muted to ensure that the CSI-RSs of other coordinated cells are not affected by the local cell signal. Interference.

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

In an embodiment of the present invention, the first base station performs a muting process on the ninth RE of the first cell, where the ninth RE is the same as the transmission mode. The RE corresponding to the first CSI-RS of the second cell.

Specifically, taking the first cell as an example, the first base station determines the ninth RE in the data channel symbol of the transmission resource of the first cell, in the transmission mode is any one of the transmission modes of the TM 8-10;

The first base station performs a muting process on the ninth RE.

所示的RE。图7中Ax和Ay处的RE为与第一小区的CSI-RS位置对应的RE，Bx和By处的RE为与第二小区的CSI-RS位置对应的RE，为了避免对第二小区的CSI-RS的干扰，第一基站对Bx和By处的RE进行muting。For example, as shown in FIG. 7, the first base station performs muting processing on the RE corresponding to the location of the CSI-RS of the second cell of the first cell, as shown in FIG. 7.

The RE shown. The REs at Ax and Ay in FIG. 7 are REs corresponding to the CSI-RS locations of the first cell, and the REs at Bx and By are REs corresponding to the CSI-RS locations of the second cell, in order to avoid the second cell The CSI-RS interferes with the first base station muting the REs at Bx and By.

Through the above scheme, it can be ensured that the CSI-RS of each cell is not interfered by other coordinated cells.

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

所示的RE。图中

所示的RE表示为了协作小区的DMRS所对应的RE而静默的RE。该静默的RE是为了避免本小区(第一小区)在这些RE位置上发射信号对这些RE位置上的采用不同传输模式的第二小区的DMRS信号产生干扰。Specifically, in a symmetric multi-point 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, and the number of antenna ports configured by two coordinated cells is different. For example, when one cell selects the TM 1-6 transmission mode and another cell selects the TM 8-10 transmission mode, the cell that selects the TM 1-6 mode needs to be the DMRS of the cell that will interfere with the selection of the TM 8-10 transmission mode. The PDSCH RE performs the Muting operation to ensure the orthogonality of the DMRS of the TM 8-10 transmission mode cell, and also ensures that the PDSCHs of all cells are aligned, as shown in FIG.

The RE shown. In the picture

The RE shown is a RE that is silent for the RE corresponding to the DMRS of the coordinated cell. The silent RE is to prevent the local cell (first cell) from transmitting signals at these RE locations to interfere with the DMRS signals of the second cells in different RE modes at these RE locations.

For the cooperation of other various TM modes, the same principle is followed. The PDSCH in the TM mode of each cell is Muting in the RS (CRS, DMRS or CSI-RS) position of the coordinated cell TM mode to ensure the cell. The RSs are mutually orthogonal (not interfering with each other) while ensuring 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 in combination or separately, and the present invention is not limited thereto.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be directed to the embodiments of the present invention. The implementation process constitutes any limitation.

It is to be understood that the specific embodiments of the present invention are not intended to limit the scope of the embodiments of the invention.

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

FIG. 9 shows a schematic block diagram of a base station 900 in accordance with an embodiment of the present invention. The base station 900 can be a base station in the foregoing method embodiment, such as the first base station 201. As shown in FIG. 9, the base station 900 includes:

The mapping module 910 is configured to map the first cell-specific reference signal CRS of the first cell to the first resource element RE corresponding to the first CRS, to obtain a signal on the first RE, where the first RE is located Within the control channel symbol of the transmission resource, the first RE has a corresponding first auxiliary RE, the signal on the first secondary RE is the same as the signal on the first RE; and the first control channel signal of the first cell And mapping to the second RE corresponding to the second CRS of the second cell, where the signal on the second RE is obtained, where the second cell is a coordinated cell of the first cell, and the second RE is located in the control of the transmission resource Within the channel symbol, 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 processing module 920 is configured to weight the signal on the first RE and the signal on the first auxiliary RE according to the orthogonal sequence of the first cell, and the second RE according to the orthogonal sequence of the first cell The upper signal and the signal on the second auxiliary RE are weighted;

The sending module 930 is configured to send 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 in the embodiment of the present invention can implement the orthogonality of the reference signals of the coordinated cells by using the auxiliary RE and the orthogonal sequence weighting, and does not affect the performance of the channel estimation or the performance of the control channel, thereby improving the demodulation performance.

In an embodiment of the present invention, the processing module 920 is further configured to: scramble the signal on the first RE and the signal on the first auxiliary RE, and signal on the second RE And scrambling the signal on the second auxiliary RE.

In an embodiment of the present invention, optionally, for antenna port 0 or 1, and the transmission mode is not the transmission mode TM 7, the first secondary RE and the second secondary RE are located in the first subframe of the transmission resource. Data channel symbol; or,

For antenna port 0 or 1, and the transmission mode is TM 7, the first secondary RE and the second secondary RE are located in the sixth symbol of the subframe of the transmission resource (it is understood that here the sixth symbol The symbol number is 5 because the symbol number is numbered from 0); or,

For antenna port 2 or 3, the first secondary RE and the second secondary RE are located in the last control channel symbol of the subframe of the transmission resource.

In an embodiment of the present invention, the processing module 920 is further configured to perform a silent muting process on the third auxiliary RE of the third RE corresponding to the third CRS of the first cell, where the third RE Located in the control channel symbol of the transmission resource, the third CRS and the first CRS correspond to different antenna ports.

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

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

The sending module 930 is further configured to send a signal on the fourth RE.

In an embodiment of the present invention, the processing module 920 is further configured to perform muting processing on the sixth RE of the first cell for the antenna port 5 and the transmission mode is TM 7, wherein 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, the processing module 920 is further configured to: for any one of the transmission modes of the TM 8-10, according to the DMRS orthogonal sequence, the seventh RE and the first cell of the first cell The eight REs perform orthogonal processing, where 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.

In an embodiment of the present invention, the processing module 920 is further configured to perform muting processing on the ninth RE of the first cell for any one of the transmission modes of the TM 8-10, where the ninth The RE is an RE corresponding to the first channel state information reference signal CSI-RS of the second cell.

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

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

The base station 900 according to an embodiment of the present invention may correspond to a first base station in a method of transmitting a signal according to an embodiment of the present invention, and the above-described and other operations and/or functions of respective modules in the base station 900 are respectively implemented to implement the respective methods described above. The process, for the sake of brevity, will not be described here.

FIG. 10 shows a schematic block diagram of a UE 1000 in accordance with an embodiment of the present invention. The UE 1000 may be a UE in the foregoing method embodiment, such as the UE 203. As shown in FIG. 10, the UE 1000 includes:

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

The processing module 1020 is configured to perform decorrelation on the received first RE and the signal on the first secondary RE according to the orthogonal sequence of the first cell, and perform the first according to the de-correlated signal and the first CRS. Channel estimation for a cell.

Through the foregoing solution, orthogonality of the reference signals of the coordinated cells can be implemented, which does not affect the performance of the channel estimation or the performance of the control channel, thereby improving the demodulation performance.

In an embodiment of the present invention, the processing module 1020 is configured to perform descrambling on the de-correlated 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, the processing module 1020 is configured to descramble the received signal on the first RE and the first auxiliary RE according to an orthogonal sequence of the first cell. De-correlated the descrambled signal.

In an embodiment of the present invention, optionally, for antenna port 0 or 1, and the transmission mode is not the transmission mode TM 7, the first secondary RE is located in the first data channel symbol of the subframe of the transmission resource; or

For antenna port 0 or 1, and the transmission mode is TM 7, the first secondary RE is located at the sixth symbol of the subframe of the transmission resource (it is understood that the symbol number of the sixth symbol here is 5 because Symbol numbers are numbered starting from 0); or,

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

In an embodiment of the present invention, 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 the transmission resource. Within the data channel symbol;

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.

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

The UE 1000 according to an embodiment of the present invention may correspond to a UE in a method of transmitting a signal according to an embodiment of the present invention, and the above-described and other operations and/or functions of respective modules in the UE 1000 are respectively implemented in order to implement respective processes of the foregoing respective methods. For the sake of brevity, we will not repeat them here.

FIG. 11 shows a structure of a base station according to still another embodiment of the present invention, including at least one processor 1102 (for example, a CPU), at least one network interface 1105 or other communication interface, a memory 1106, and at least one communication bus 1103. To achieve connection communication between these devices. The processor 1102 is configured to execute executable modules, such as computer programs, stored in the memory 1106. The memory 1106 may include a high speed random access memory (RAM), and may also include a non-volatile memory such as at least one disk memory. A communication connection with at least one other network element is achieved by at least one network interface 1105 (which may be wired or wireless).

In some embodiments, memory 1106 stores program 11061, and processor 1102 executes program 11061 for performing the various methods of the aforementioned embodiments of the present invention.

FIG. 12 shows a structure of a UE according to still another embodiment of the present invention, including at least one processor 1202 (for example, a CPU), at least one network interface 1205 or other communication interface, a memory 1206, and at least one communication bus 1203. To achieve connection communication between these devices. The processor 1202 is configured to execute executable modules, such as computer programs, stored in the memory 1206. The memory 1206 may include a high speed random access memory (RAM), and may also include a non-volatile memory such as at least one disk memory. A communication connection with at least one other network element is achieved by at least one network interface 1205, which may be wired or wireless.

In some embodiments, the memory 1206 stores a program 12061, and the processor 1202 executes the program 12061 for performing the various methods of the aforementioned embodiments of the present invention.

It should be understood that in the embodiment of the present invention, the term "and/or" is merely an association relationship describing an associated object, indicating that there may be three relationships. For example, A and/or B may indicate that A exists separately, and A and B exist simultaneously, and B cases exist alone. In addition, the character "/" in this article, one It is common to indicate that the contextual object is an "or" relationship.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the 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 standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. Including a number of instructions to make a computer device (can be a personal computing The machine, server, or network device, etc.) performs all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention by any person skilled in the art. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims (28)

A method for transmitting a signal, comprising: Mapping the first cell-specific reference signal CRS of the first cell to the first resource element RE corresponding to the first CRS, to obtain a signal on the first RE, where the first RE is located in the control of the transmission resource Within the channel symbol, 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 the first control channel signal of the first cell to the second RE corresponding to the second CRS of the second cell, to obtain a signal on the second RE, where the second cell is the first cell Cooperating 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 on the second RE The same signal; Weighting the signal on the first RE and the signal on the first auxiliary RE according to an orthogonal sequence of the first cell; Weighting the signal on the second RE and the signal on the second auxiliary RE according to an orthogonal sequence of the first cell; Transmitting 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 method according to claim 1, wherein said signal on said first RE and a signal on said first auxiliary RE, and a signal on said second RE and said second Before the signal on the auxiliary RE, the method further includes: And scrambling the signal on the first RE and the signal on the first auxiliary RE; The signal on the second RE and the signal on the second auxiliary RE are scrambled. The method according to claim 1 or 2, wherein, for antenna port 0 or 1, and the transmission mode is not the transmission mode TM7, the first auxiliary RE and the second secondary RE are located in the transmission resource The first data channel symbol of the frame; or, For antenna port 0 or 1, and the transmission mode is TM7, the first secondary RE and the second secondary RE are located in the sixth symbol of the subframe of the transmission resource; or For antenna port 2 or 3, the first secondary RE and the second secondary RE are located in the last control channel symbol of the subframe of the transmission resource. The method according to any one of claims 1 to 3, further comprising: Performing a silent process on the third secondary RE of the third cell corresponding to the third CRS, where the third RE is located in a control channel symbol of the transmission resource, and the third CRS The first CRS corresponds to a different antenna port. 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, where the fourth RE is located in a data channel symbol of the transmission resource; Performing a silent process on the fifth RE corresponding to the fifth CRS of the second cell of the first cell, where the fifth RE is located in a data channel symbol of the transmission resource; Sending a signal on the fourth RE. The method according to any one of claims 1 to 5, wherein the method further comprises: For the antenna port 5, and the transmission mode is TM7, the sixth RE of the first cell is subjected to a silent process, wherein the sixth RE is an RE corresponding to the first demodulation reference signal DMRS of the second cell. The method according to any one of claims 1 to 6, wherein the method further comprises: For the transmission mode being any of the transmission modes of TM8-10, performing orthogonal processing on the seventh RE and the eighth RE of the first cell according to the DMRS orthogonal sequence, where the seventh RE is the first cell The second DMRS corresponds to the RE, and the eighth RE is an RE corresponding to the third DMRS of the second cell. The method according to any one of claims 1 to 7, wherein the method further comprises: Performing a silent process on the ninth RE of the first cell, where the transmission mode is any one of the transmission modes, wherein the ninth RE is a first channel state information reference signal CSI- The RE corresponding to the RS. The method according to any one of claims 1 to 8, wherein the method further comprises: Performing a silent process on the tenth RE of the first cell when the first cell and the second cell adopt different transmission modes, where the tenth RE is corresponding to the reference signal RS of the second cell RE, the RS includes at least one of a CRS, a DMRS, and a CSI-RS. A method for transmitting a signal, comprising: Receiving a signal on a first resource element RE corresponding to a first cell-specific reference signal CRS of the first cell and a signal on a first auxiliary RE of the first RE, where the first RE is located in a transmission resource Within the control channel symbol; De-correlating the received signals on the first RE and the first auxiliary RE according to an orthogonal sequence of the first cell; Performing channel estimation of the first cell according to the de-correlated signal and the first CRS. The method of claim 10, wherein the method further comprises: Desmuting the de-correlated signal; The performing channel estimation of the first cell according to the de-correlated signal and the first CRS includes: Performing channel estimation of the first cell according to the descrambled signal and the first CRS. The method of claim 10, wherein the method further comprises: Desmuting the received signals on the first RE and the first auxiliary RE; De-correlating the received signal on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell, including: The descrambled signal is decorrelated according to the orthogonal sequence of the first cell. The method according to any one of claims 10 to 12, wherein, for antenna port 0 or 1, and the transmission mode is not the transmission mode TM7, the first auxiliary RE is located in the subframe of the transmission resource a data channel symbol; or, For antenna port 0 or 1, and the transmission mode is TM7, the first secondary RE is located at the sixth symbol of the subframe of the transmission resource; or For antenna port 2 or 3, the first secondary RE is located at the last control channel symbol of the subframe of the transmission resource. The method according to any one of claims 10 to 13, wherein the method further comprises: Receiving 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; 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 the first cell to a first resource element RE corresponding to the first CRS, to obtain a signal on the first RE, where the first RE Within the control channel symbol of the transmission resource, the first RE has a corresponding first auxiliary RE, the signal on the first secondary RE is the same as the signal on the first RE; and the first cell is The first control channel signal is mapped to the second RE corresponding to the second CRS of the second cell, to obtain a signal on the second RE, where the second cell is a coordinated cell of the first cell, where the 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; a processing module, configured to weight, by using an orthogonal sequence of the first cell, a signal on the first RE and a signal on the first secondary RE, and according to an orthogonal sequence of the first cell Weighting the signal on the second RE and the signal on the second auxiliary RE; And a sending module, configured to send 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 according to claim 15, wherein the processing module is further configured to scramble a signal on the first RE and a signal on the first auxiliary RE, and to the second The signal on the RE and the signal on the second auxiliary RE are scrambled. The base station according to claim 15 or 16, wherein for the antenna port 0 or 1, and the transmission mode is not the transmission mode TM7, the first auxiliary RE and the second secondary RE are located in the transmission resource The first data channel symbol of the frame; or, For antenna port 0 or 1, and the transmission mode is TM7, the first secondary RE and the second secondary RE are located in the sixth symbol of the subframe of the transmission resource; or For antenna port 2 or 3, the first secondary RE and the second secondary RE are located in the last control channel symbol of the subframe of the transmission resource. The base station according to any one of claims 15 to 17, wherein the processing module is further configured to: silence the third auxiliary RE of the third RE corresponding to the third CRS of the first cell Processing, wherein the third RE is located in a control channel symbol of the transmission resource, and the third CRS and the first CRS correspond to different antenna ports. The base station according to any one 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. The fourth RE is located in a data channel symbol of the transmission resource; The processing module is further configured to perform a silent process on the fifth RE corresponding to the fifth CRS of the second cell of the first cell, where the fifth RE is located in a data channel symbol of the transmission resource Inside; The sending module is further configured to send a signal on the fourth RE. The base station according to any one of claims 15 to 19, wherein the processing module is further configured to perform silent processing on the sixth RE of the first cell for the antenna port 5 and the transmission mode is TM7. The sixth RE is an RE corresponding to the first demodulation reference signal DMRS of the second cell. The base station according to any one of claims 15 to 20, wherein the processing module is further configured to: pair the first mode according to a DMRS orthogonal sequence for any one of the transmission modes of the TM8-10 The seventh RE and the eighth RE of the cell perform orthogonal processing, where the seventh RE is an RE corresponding to a second DMRS of the first cell, and the eighth RE is a third with the second cell RE corresponding to DMRS. The base station according to any one of claims 15 to 21, wherein the processing module is further configured to: for any one of the transmission modes of the TM8-10, the ninth RE of the first cell Performing a silent process, wherein the ninth RE is an RE corresponding to the first channel state information reference signal CSI-RS of the second cell. The base station according to any one of claims 15 to 22, wherein the processing module is further configured to: when the first cell and the second cell adopt different transmission modes, the first The tenth RE of the cell performs a silent process, where the tenth RE is an RE corresponding to the reference signal RS of the second cell, and the RS includes at least one of a CRS, a DMRS, and a CSI-RS. A user equipment (UE), comprising: a receiving module, configured to receive a signal on the first resource element RE corresponding to the first cell-specific reference signal CRS of the first cell and a signal on the first auxiliary RE of the first RE, where the first The RE is located in the control channel symbol of the transmission resource; a processing module, configured to perform decorrelation on the received signal on the first RE and the first auxiliary RE according to the orthogonal sequence of the first cell, according to the de-correlated signal and the first CRS Performing channel estimation of the first cell. The UE according to claim 24, wherein the processing module is configured to descramble the de-correlated signal, according to the descrambled signal and the first CRS The channel estimate of the first cell. The UE according to claim 24, wherein the processing module is configured to descramble the received signals on the first RE and the first auxiliary RE, according to the first The orthogonal sequence of the cell de-correlates the descrambled signal. The UE according to any one of claims 24 to 26, wherein, for antenna port 0 or 1, and the transmission mode is not the transmission mode TM7, the first auxiliary RE is located in the subframe of the transmission resource a data channel symbol; or, For antenna port 0 or 1, and the transmission mode is TM7, the first secondary RE is located at the sixth symbol of the subframe of the transmission resource; or For antenna port 2 or 3, the first secondary RE is located at the last control channel symbol of the subframe of the transmission resource. The UE according to any one of claims 24 to 27, wherein the receiving module is further configured to receive a signal on a fourth RE corresponding to a fourth CRS of the first cell, where Said fourth RE is located in a data channel symbol of said transmission resource; 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.

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