WO2016180192A1 - Transmission mode determination method and apparatus - Google Patents

Abstract

A transmission mode determination method and apparatus, which are used to determine a transmission mode of an interference cell according to acquired parameter information, realize blind detection of the transmission mode of the interference cell without a network side issuing the transmission mode of the interference cell, and improve the flexibility of the network side. The transmission mode determination method comprises: acquiring parameter information for determining a transmission mode of an interference cell; and determining the transmission mode used by the interference cell according to the parameter information.

Description

Method and device for determining transmission mode

This application claims priority to Chinese Patent Application No. 201510239241.6, entitled "Determining Method and Apparatus for a Transmission Mode", filed on May 12, 2015, the entire contents of which are incorporated herein by reference. In the application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a transmission mode.

Background technique

In the Long Term Evolution Advanced (LTE-A) Release 12 (Rel12) system, in order to improve the system throughput in the interference scenario, the network side sends some parameter information of the interfering cell to the user equipment (User Equipment, UE), assisting the UE in detecting or blocking the neighboring cell interference (Network Assisted Interference Cancellation and Suppression, NAICS). However, some of the parameter information sent by the network side is dynamic parameter information (for example, a transmission mode of the interfering cell). If the part of the dynamic parameter information is sent to the UE, the network side The dynamic parameter information will become static parameter information, so that the configuration of the part of the dynamic parameter information on the network side loses flexibility.

In summary, in the prior art, when the parameter information of the interfering cell sent by the network side is used to assist the UE in detecting or suppressing the interference of the neighboring cell, if the network side selects some dynamic parameter information (for example, the transmission mode of the interfering cell) Delivered to the UE will cause loss of flexibility on the network side.

Summary of the invention

The embodiment of the present invention provides a method and a device for determining a transmission mode, which are used to determine a transmission mode of an interfering cell according to the obtained parameter information, and implement blind detection of a transmission mode of the interfering cell, without transmitting the interfering cell by the network side. Mode to increase flexibility on the network side.

An embodiment of the present invention provides a method for determining a transmission mode, where the method includes: acquiring parameter information for determining an interference cell transmission mode; and determining, according to the parameter information, a transmission of the interference cell. Loss mode.

In the above method provided by the embodiment of the present invention, the parameter information used to determine the transmission mode of the interfering cell is obtained, and the transmission mode used by the interfering cell is determined according to the obtained parameter information, and the transmission of the interfering cell is sent by the network side in the prior art. The mode may cause the network side to lose flexibility. Compared with the obtained parameter information, the transmission mode used by the interfering cell is determined, and the blind cell transmission mode can be blindly detected, without the network side transmitting the interfering cell transmission mode, and improving the network side. flexibility.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, the parameter information includes: an identifier of an interfering cell and a set of transmission modes supported by the interfering cell.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, determining, according to the parameter information, a transmission mode used by an interfering cell, specifically: determining a physical resource block (Physical Resource Block, where interference exists in the cell) a PRB), for each PRB that has interference in the cell, determining, according to the received signal on the PRB, the interference cell corresponding to the identifier of the interfering cell in the transmission mode set supported by the interfering cell, on the PRB Transfer mode.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, determining, according to the received signal on the PRB, an interference cell corresponding to the identifier of the interfering cell in a transmission mode set supported by the interfering cell The transmission mode used on the PRB specifically includes: when it is determined that a De Modulation Reference Signal (DMRS) exists in the received signal on the PRB, determining that the interference cell corresponding to the identifier of the interfering cell is in the The transmission mode used on the PRB is a DMRS-based transmission mode. When it is determined that there is no DMRS in the received signal on the PRB, the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell to be used on the PRB is determined to be public. The transmission mode of the reference signal (also known as Cell-specific Reference Signal) (CRS).

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, if the transmission mode set supported by the interfering cell includes a space-frequency block code (SFBC)-based transmission mode, After determining that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell is the CRS-based transmission mode, the method further includes: for each PRB that has interference in the local cell: at the first receiving antenna And the second receiving antenna respectively Detecting a received signal, for each of the receiving antennas, each of the two adjacent physical downlink shared channel resource units PDSCH-RE (PDSCH: Physical Downlink Shared Channel; RE:resource) Element (resource unit) performs joint detection to determine a plurality of decision vector vectors corresponding to the receiving antenna; and calculates a decision vector corresponding to the first receiving antenna and a decision vector corresponding to the second receiving antenna by using the following formula Mean Square Error (MSE):

The N _{RE is} the number of REs transmitting the PDSCH in the PRB, and the N _RE PDSCH-REs are grouped in advance to obtain N _RE /2 PDSCH-RE groups, where two PDSCHs in each group of PDSCH-REs RE is an adjacent PDSCH-RE, and C _r1 is a decision vector composed of a decision amount obtained by joint detection of each group of PDSCH-REs by the first receiving antenna; C _r2 is a PDSCH-RE using each of the second receiving antennas Performing a judgment amount vector composed of the judgment amount obtained by the joint detection; determining, according to the MSE, a network side transmission symbol detected by using the received signal on the first receiving antenna and a network detected by using the received signal on the second receiving antenna Whether the side transmission symbols are the same, if yes, determining that the transmission mode used by the interfering cell on the PRB is an SFBC-based transmission mode; otherwise, determining that the transmission mode used by the interfering cell on the PRB is a codebook-based transmission mode.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, the network side transmitting symbol detected by using the received signal on the first receiving antenna and using the second receiving antenna are determined according to the MSE. Whether the network side transmission symbol detected by the received signal is the same includes: determining whether the MSE is less than a preset threshold, and if yes, determining, by using the received signal on the first receiving antenna, a network side sending symbol and a utilization point. The network side transmission symbol detected by the received signal on the second receiving antenna is the same; otherwise, determining the network side transmission symbol detected by using the received signal on the first receiving antenna and detecting by using the received signal on the second receiving antenna The network side sends different symbols.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell to be used on the PRB is based on a codebook. After the transmission mode, the method further includes: determining a decision reference quantity corresponding to all codebooks in the codebook-based transmission mode, wherein each codebook of each transmission mode corresponds to a decision reference quantity; determining the all codes a minimum decision reference quantity in the corresponding reference reference quantity, and determining a codebook corresponding to the minimum decision reference quantity; determining a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs is used by the interfering cell on the PRB a transmission mode, and determining, according to the codebook corresponding to the minimum decision reference quantity, a precoding matrix indication PMI corresponding to a transmission mode of the interfering cell on the PRB.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, if the transmission mode set supported by the interfering cell does not include a transmission mode based on the space frequency block coding SFBC, determining the interference cell After determining that the transmission mode used by the corresponding interfering cell on the PRB is a CRS-based transmission mode, the method further includes: determining a decision reference amount corresponding to all codebooks in the codebook-based transmission mode, where the CRS-based transmission The mode includes a codebook-based transmission mode, each codebook of each codebook-based transmission mode corresponds to a decision reference quantity; determining a minimum decision reference quantity of the decision reference quantities corresponding to the all codebooks, and determining Determining a codebook corresponding to the minimum decision reference quantity; determining a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs is a transmission mode used by the interfering cell on the PRB, and according to the codebook corresponding to the minimum decision reference quantity Determining a Precoding Matrix Indicator (PMI) corresponding to a transmission mode of the interfering cell on the PRB.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, determining a decision reference quantity corresponding to all codebooks in a codebook-based transmission mode, specifically, including: for each of the codebook-based transmission modes Each codebook of the transmission mode is configured to detect a received signal based on the codebook, and determine a sequence of the decision amount corresponding to the codebook according to the received signal, where the sequence of the determined amount includes a determination amount determined by detecting each PDSCH-RE; The variance value of all the judgment amounts in the sequence of the decision amount is used as the decision reference amount corresponding to the codebook.

An embodiment of the present invention provides a device for determining a transmission mode, including: an acquiring unit, configured to acquire parameter information for determining a transmission mode of an interfering cell; and a processing unit, connected to the acquiring unit, configured to determine, according to the parameter information, an interference cell. The transfer mode used.

In the above apparatus provided by the embodiment of the present invention, the method for determining an interference cell transmission mode is obtained by acquiring The parameter information is used to determine the transmission mode used by the interfering cell according to the obtained parameter information. Compared with the transmission mode of the interfering cell sent by the network side in the prior art, the network side loses flexibility, and the interfering cell is determined according to the obtained parameter information. The transmission mode used can implement blind detection of the interfering cell transmission mode, and the network side does not need to transmit the transmission mode of the interfering cell, thereby improving the flexibility of the network side.

In a possible implementation manner, in the foregoing apparatus provided by the embodiment of the present invention, the parameter information includes: an identifier of an interfering cell and a set of transmission modes supported by the interfering cell.

In a possible implementation manner, in the foregoing apparatus provided by the embodiment of the present invention, the processing unit is specifically configured to: the processing unit determines a physical resource block PRB that has interference in the local cell; and that there is interference in the local cell. For each PRB, the processing unit determines, according to the received signal on the PRB, a transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB in a transmission mode set supported by the interfering cell.

In a possible implementation manner, in the foregoing apparatus provided by the embodiment of the present invention, the processing unit determines, according to a received signal on the PRB, an identifier of the interfering cell in a transmission mode set supported by the interfering cell. The transmission mode used by the corresponding interfering cell on the PRB is specifically configured to: when the processing unit determines that the demodulation reference symbol DMRS exists in the received signal on the PRB, determine an interference cell corresponding to the identifier of the interfering cell The transmission mode used on the PRB is a DMRS-based transmission mode; when the processing unit determines that there is no DMRS in the received signal on the PRB, determining that the interfering cell corresponding to the identifier of the interfering cell is used on the PRB The transmission mode is a transmission mode based on the common reference signal CRS.

In a possible implementation manner, in the foregoing apparatus provided by the embodiment of the present invention, if the transmission mode set supported by the interfering cell includes a transmission mode based on a space frequency block coding SFBC, determining, by the processing unit, the After the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell is the CRS-based transmission mode, the processing unit is further configured to: for each PRB that has interference in the local cell: the processing unit is in the A receiving signal is respectively detected on a receiving antenna and a second receiving antenna, and for each receiving antenna, two adjacent physical downlink shared channel resource units PDSCH-RE in the receiving antenna are jointly detected to determine the receiving antenna. Corresponding multiple decision amount vectors; the processing unit calculates the corresponding corresponding to the first receiving antenna by using the following formula The mean square error MSE of the decision vector vector and the decision vector corresponding to the second receiving antenna:

The N _{RE is} the number of REs transmitting the PDSCH in the PRB, and the N _RE PDSCH-REs are grouped in advance to obtain N _RE /2 PDSCH-RE groups, where two PDSCHs in each group of PDSCH-REs RE is an adjacent PDSCH-RE, and C _r1 is a decision vector composed of a decision amount obtained by joint detection of each group of PDSCH-REs by the first receiving antenna; C _r2 is a PDSCH-RE using each of the second receiving antennas Performing a judgment amount vector composed of the judgment amount obtained by the joint detection; the processing unit determines, according to the MSE, the network side transmission symbol detected by using the received signal on the first receiving antenna and the receiving signal on the second receiving antenna Whether the detected network side transmission symbols are the same, and if yes, determining that the transmission mode used by the interfering cell on the PRB is an SFBC-based transmission mode; otherwise, determining that the transmission mode used by the interfering cell on the PRB is codebook-based Transfer mode.

In a possible implementation manner, in the foregoing apparatus provided by the embodiment of the present invention, the processing unit determines, according to the MSE, a network side transmission symbol detected by using a received signal on the first receiving antenna, and using the Whether the network side transmission symbols detected by the received signals on the two receiving antennas are the same, specifically, the processing unit determines whether the MSE is less than a preset threshold, and if yes, determines to use the first receiving antenna to detect the received signals. The out network side transmission symbol is the same as the network side transmission symbol detected by using the received signal on the second receiving antenna, otherwise, determining the network side transmission symbol detected by using the received signal on the first receiving antenna and using the The network side transmitted symbols detected by the received signals on the second receiving antenna are different.

In a possible implementation manner, in the foregoing apparatus provided by the embodiment of the present invention, the processing unit determines that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is codebook-based transmission. After the mode, the processing unit is further configured to: determine, by the processing unit, a decision reference quantity corresponding to all codebooks in a codebook-based transmission mode, where each codebook of each transmission mode corresponds to one decision reference quantity; The processing unit determines a minimum decision reference amount of the decision reference quantities corresponding to the all codebooks, and determines a codebook corresponding to the minimum decision reference quantity; The processing unit determines a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs as a transmission mode used by the interfering cell on the PRB, and determines, according to the codebook corresponding to the minimum decision reference quantity, the interfering cell on the PRB. The precoding matrix corresponding to the transmission mode indicates the PMI.

In a possible implementation manner, in the foregoing apparatus provided by the embodiment of the present invention, if the transmission mode supported by the interfering cell does not include a transmission mode based on the space frequency block coding SFBC, determining, by the processing unit, After the transmission mode of the interfering cell corresponding to the identifier of the interfering cell is the CRS-based transmission mode, the processing unit is further configured to: determine, by the processing unit, that all codebooks in the codebook-based transmission mode correspond to a decision reference quantity, wherein the CRS-based transmission mode includes a codebook-based transmission mode, each codebook of each codebook-based transmission mode corresponding to a decision reference quantity; and the processing unit determines the all codebooks Determining a minimum decision reference quantity in the reference reference quantity, and determining a codebook corresponding to the minimum decision reference quantity; the processing unit determining, by the processing unit, a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs a transmission mode used on the PRB, and determining, according to the codebook corresponding to the minimum decision reference quantity, a transmission mode pair of the interfering cell on the PRB The precoding matrix should indicate the PMI.

In a possible implementation manner, in the foregoing apparatus provided by the embodiment of the present invention, the processing unit determines a decision reference quantity corresponding to all codebooks in a codebook-based transmission mode, specifically for: codebook-based transmission Each codebook of each transmission mode in the mode: the processing unit detects the received signal based on the codebook, and determines a sequence of the decision amount corresponding to the codebook according to the received signal, where the sequence of the decision is included in each PDSCH- The RE performs a detection of the determined amount of the determination; the processing unit uses the variance value of all the judgment amounts in the sequence of the decision amount as the decision reference amount corresponding to the codebook.

DRAWINGS

1 is a schematic diagram of a principle of a network assisted interference cancellation receiver according to an embodiment of the present invention;

2 is a schematic flowchart of a method for determining a transmission mode according to an embodiment of the present invention;

FIG. 3 is a detailed flowchart of a method for determining a transmission mode according to an embodiment of the present invention;

4 is a schematic structural diagram of a device for determining a transmission mode according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another apparatus for determining a transmission mode according to an embodiment of the present invention.

detailed description

A specific implementation manner of a method and apparatus for determining a transmission mode according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

It should be noted that, in the LTE-A Rel-12 system, the network side device (for example, the base station) sends an interfering cell identifier (Identifier, ID), the number of common reference signal ports, and the PB (the pilot OFDM symbol). Information such as the ratio of PDSCH-RE power to RS-RE power), a subset of PA (the ratio of PDSCH-RE power on pilotless OFDM symbols to RS-RE power), based on this information, combined with the received signal And channel estimation, blind detection of the transmission mode of the interfering cell can be performed. At the same time, the base station sends various transmission modes supported by the interfering cell, and the set of transmission modes supported by the interfering cell can be: {TM1, TM2, TM3, TM4, TM6, TM8, TM9}. In the current network environment, the number of CRS ports is 2. The transmission mode set that the base station usually implements is: {TM2, TM3, TM9} or {TM2, TM4, TM9}, that is, the transmission diversity mode TM2 with better robustness is achieved. The high-speed spatial multiplexing mode TM3 or TM4 can flexibly implement the DMRS-based transmission mode TM8 or TM9 with robustness and high-rate switching in the low- and medium-speed scenarios. The two modes are relatively close, and the general network can only implement one type. The DMRS-based transmission mode is assumed to be TM9 in the embodiment of the present invention.

If the number of CRS ports configured by the base station is 1, the CRS-based transmission mode can only be the single-port transmission mode of TM1, and it is impossible for other CRS-based transmission modes.

The blind detection of the interfering cell transmission mode is a key part of the UE in the network-assisted interference cancellation receiver. The overall processing flow of the network-assisted interference cancellation receiver is shown in Figure 1. First, the channel estimation module performs channel estimation to estimate the service. The channel of the cell is subjected to the strongest interference detection according to the cell ID of the interfering cell delivered by the base station, and the cell ID with the strongest interference is estimated, and the PDSCH presence detection is performed on each PRB corresponding to the cell ID with the strongest interference, and the DMRS is determined. There is a port number nSCID, and it is judged whether there is interference, and the judgment is made one by one. If it is further determined that there is interference on the PRB, it is determined whether there is a DMRS on the PRB, and if there is a DMRS, it is determined that the interfering cell is a DMRS-based transmission, and further performing a blind detection of the PDSCH start symbol; if there is no DMRS, determining The interfering cell is a CRS-based transmission. If the interfering cell is CRS based For transmission, further blind detection of parameters such as PDSCH start symbol and PA is required, and then blind detection and PMI blind detection of CRS based transmission mode are performed, and the transmission mode can also be judged while the transmission mode is blindly detected (if the transmission mode is The corresponding PMI of TM3, TM4, TM6) is followed by blind detection of the modulation mode. This completes the blind check of all parameters, and then completes the demapping and detection functions.

In the following, the LTE system is taken as an example to describe the transmission mode blind detection and the PMI blind detection in the network auxiliary interference cancellation receiver. In other communication systems, the transmission mode of the interfering cell may not include all transmission modes. However, blind detection can also be performed using the scheme of the embodiment of the present invention.

On the user equipment UE side, the embodiment of the present invention provides a method for determining a transmission mode. As shown in FIG. 2, the method includes:

Step 202: Obtain parameter information used to determine an interference cell transmission mode.

Step 204: Determine, according to the acquired parameter information, a transmission mode used by the interfering cell.

In the method provided by the embodiment of the present invention, the parameter information used to determine the transmission mode of the interfering cell is obtained, and the transmission mode used by the interfering cell is determined according to the obtained parameter information, and the transmission mode of the interfering cell is sent by the network side in the prior art. The network side loses flexibility. Compared with the obtained parameter information, the transmission mode used by the interfering cell is determined, thereby implementing blind detection of the interfering cell transmission mode, without the network side transmitting the interfering cell transmission mode, and improving the flexibility of the network side. Sex.

It should be noted that the obtained parameter information may include parameter information that is sent by the network side, and may also include parameter information that the UE requests from the network side, and may also include parameter information that is processed by other nodes in the network auxiliary interference cancellation receiver.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the acquired parameter information includes: an identifier of the interfering cell and a set of transmission modes supported by the interfering cell.

In a specific implementation, the identifier of the interfering cell is the identifier of the strongest interfering cell. Specifically, the identifier of the interfering cell in the parameter information acquired by the UE may be the strongest interfering cell determined by other nodes in the network assisted interference deletion receiver. Identification, of course, it should be understood by those skilled in the art that the identifier of the interfering cell sent by the network side may include the identifiers of the multiple interfering cells, and then processed by the strongest interference detecting node in the network assisted interference cancellation receiver to determine The flag of the strongest interfering cell The transmission mode used by the interfering cell corresponding to the identifier of the strongest interfering cell is determined. The obtained parameter information may further include: a common reference signal port number, a PB, a PA subset, a channel estimation value, and the like.

In a possible implementation manner, in the method provided by the embodiment of the present invention, determining, according to the obtained parameter information, a transmission mode used by the interfering cell, specifically, determining: a physical resource block PRB that has interference in the local cell; Each PRB that has interference, according to the received signal on the PRB, determines, in the set of transmission modes supported by the interfering cell, a transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB.

In a specific implementation, the physical resource block PRB with interference in the cell may be determined by other nodes in the network auxiliary interference cancellation receiver (for example, the node where the PDSCH presence detection is performed on each PRB shown in FIG. 1), and the transmission mode is performed. In the blind detection, the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is determined in the transmission mode set supported by the interfering cell, and the efficiency of determining the transmission mode is improved.

In a possible implementation manner, in the method provided by the embodiment of the present invention, determining, according to the received signal on the PRB, the transmission used by the interfering cell corresponding to the identifier of the interfering cell on the PRB in the transmission mode set supported by the interfering cell The mode includes: when determining that the demodulation reference symbol DMRS exists in the received signal on the PRB, determining that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is a DMRS-based transmission mode; when determining the PRB When there is no DMRS in the received signal, it is determined that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is a transmission mode based on the common reference signal CRS.

In a specific implementation, since the DMRS transmission scheme has a DMRS existing on the PRB that schedules the PDSCH, the DMRS is considered to be absent. Therefore, only the presence or absence of the DMRS needs to be determined. If the DMRS exists, the interfering cell is present. The transmission mode used on the PRB is a DMRS-based transmission mode, for example: TM9. Otherwise, the transmission mode used by the interfering cell on the PRB is a CRS-based transmission mode, for example: TM2, TM3, TM4. The method for determining whether a DMRS exists in the received signal on each PRB can be used in the prior art, and details are not described herein again.

In a possible implementation manner, in the method provided by the embodiment of the present invention, if the transmission mode set supported by the interfering cell includes a transmission mode based on the space frequency block coding SFBC, the interference cell corresponding to the identifier of the interfering cell is determined. After the transmission mode used on the PRB is a CRS-based transmission mode, the method further includes: for each PRB in which interference exists in the cell: detecting the received signal on the first receiving antenna and the second receiving antenna, respectively, for each a receiving antenna, performing joint detection on each two adjacent physical downlink shared channel resource units PDSCH-RE in the receiving antenna, determining a plurality of decision vector vectors corresponding to the receiving antenna; and calculating, by using the following formula, the first receiving antenna The mean square error MSE of the decision vector and the decision vector corresponding to the second receiving antenna:

The N _{RE is} the number of REs transmitting the PDSCH in the PRB, and the N _RE PDSCH-REs are grouped in advance to obtain N _RE /2 PDSCH-RE groups, where two PDSCHs in each group of PDSCH-REs RE is an adjacent PDSCH-RE, and C _r1 is a decision vector composed of a decision amount obtained by joint detection of each group of PDSCH-REs by the first receiving antenna; C _r2 is a PDSCH-RE using each of the second receiving antennas a judgment amount vector composed of the judgment amount obtained by the joint detection; determining, by the MSE, whether the network side transmission symbol detected by using the received signal on the first receiving antenna and the network side transmission symbol detected by using the received signal on the second receiving antenna are the same, If yes, it is determined that the transmission mode used by the interfering cell on the PRB is an SFBC-based transmission mode; otherwise, it is determined that the transmission mode used by the interfering cell on the PRB is a codebook-based transmission mode.

It should be noted that, if the transmission mode set supported by the interfering cell includes an SFBC-based transmission mode, for example, TM2, after determining that the transmission mode used by the interfering cell is a CRS-based transmission mode, it is necessary to first determine the transmission used by the interfering cell. Whether the mode is TM2. Since TM2 adopts the transmission scheme of SFBC, the joint transmission of resources of two adjacent PDSCH-REs is actually a transmission of RANK1, so the UE needs to separately detect the received signals on the first receiving antenna and the second receiving antenna. Extracting the received signals of two adjacent PDSCH-REs, determining a decision vector corresponding to each receiving antenna, and using the formula

Calculating the mean square error MSE of the decision vector vector C _r1 corresponding to the first receiving antenna and the decision vector vector corresponding to the second receiving antenna C _r2 , since the blind detection of the transmission mode is usually in units of one PRB, in each PRB Including a plurality of REs for transmitting the PDSCH, the MSE is an average of a plurality of decision mean square errors, wherein the decision vector vector C _r1 corresponding to the first receiving antenna and the decision vector corresponding to the second receiving antenna C _{r2 are} calculated. The specific steps are:

Pre-packing N _RE PDSCH-REs to obtain N _RE /2 PDSCH-RE groups, wherein two PDSCH-REs in each group of PDSCH-REs are adjacent PDSCH-REs;

The decision vector composed of two judgments obtained by joint detection of each group of PDSCH-REs by the first receiving antenna is C _r1 ; the judgment of the judgment amount composed by the joint detection of each group of PDSCH-REs by the second receiving antenna The quantity vector is C _r2 .

As a more specific embodiment, assuming that the number of REs for transmitting a PDSCH in one PRB is 100, 100 PDSCH-REs are grouped in advance to obtain 50 PDSCH-RE groups, where each group of PDSCH-REs The two PDSCH-REs are adjacent PDSCH-REs. Specifically, the first group of PDSCH-REs is composed of the first PDSCH-RE and the second PDSCH-RE, and the second group of PDSCH-REs is composed of the third. The PDSCH-RE and the 4th PDSCH-RE are composed, and so on. The 50th PDSCH-RE is composed of the 99th PDSCH-RE and the 100th PDSCH-RE, and is combined in each group of PDSCH-REs by using the first receiving antenna. The two judgment quantities are combined to form a judgment vector C _r1 , and C _r1 contains 100 judgments. Similarly, the second reception antenna is used for joint detection in each group of PDSCH-RE to obtain two judgment quantities to form a judgment vector C _{r2 .} , C _r2 also contains 100 judgments.

In a specific implementation, after calculating the mean square error MSE of the first receiving antenna corresponding to the first receiving antenna and the second receiving antenna corresponding to the determining amount vector, the network side transmitting by using the received signal on the first receiving antenna is determined according to the MSE. Whether the symbol and the network side transmission symbol detected by using the received signal on the second receiving antenna are the same, if the network side transmission symbol detected by the received signal on the first receiving antenna and the network side detected by the received signal on the second receiving antenna are used If the transmission symbol is the same, the transmission mode of the interfering cell is TM2, otherwise it is not TM2. Wherein, for each receiving antenna, joint detection is performed on two adjacent PDSCH-REs, and the detection scheme adopts a minimum mean square error Minimum Mean Square Error (MMSE) or Minimum Mean Square Error-Interference Rejection Combining (MMSE-IRC) scheme.

Certainly, in a specific implementation, the received signals may be separately detected on multiple receiving antennas, the decision vector vector corresponding to each receiving antenna is determined, and then the MSE is calculated, and the calculated MSE is used to determine the transmission mode used by the interfering cell. Improve the accuracy of determining the transmission mode.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the network side transmitting symbol detected by using the received signal on the first receiving antenna and the network side detected by using the received signal on the second receiving antenna are determined according to the MSE. Whether the sending symbols are the same includes: determining whether the MSE is less than a preset threshold, and if yes, determining a network side transmission symbol detected by using the received signal on the first receiving antenna and a network side detected by using the received signal on the second receiving antenna The transmission symbols are the same, otherwise, it is determined that the network side transmission symbol detected by the reception signal on the first reception antenna is different from the network side transmission symbol detected by the reception signal on the second reception antenna.

The network-side transmission symbol detected by the received signal on the first receiving antenna detects the symbol transmitted by the network side (for example, the base station) in the received signal of the first receiving antenna, and is detected by using the received signal on the second receiving antenna. The network side transmits the symbol, that is, the symbol sent by the network side (for example, the base station) is detected in the received signal of the second receiving antenna. The preset threshold may be pre-configured or may be set according to actual conditions, for example, 0.

As a more specific embodiment, it is assumed that in an LTE system, the UE is scheduled to transmit PDSCH data services on PRB0-PRB5, assuming that the number of CRS ports is 2, CFI=2, and is transmitted in a regular CP regular subframe. The network side notifies the interference cell that the transmission mode set is {TM2, TM3, TM9}. It is assumed that the UE has learned that the PRB2-PRB5 is interfered by the neighboring cell, and the neighboring cell is not interfered on the PRB0-PRB1, that is, the neighboring cell is the strongest interfering cell.

On the PRB2-PRB5, the transmission mode used by the neighboring cell is determined one by one, that is, the blind cell is detected by the PRB, and there are 132 PDSCH-REs on each PRB. First, the detection of whether the DMRS exists is performed. If it exists, the transmission mode of the neighboring cell is considered to be TM9. Otherwise, it is determined whether the transmission mode is TM2, and the 132 decision vector corresponding to the first receiving antenna is calculated. The MSE of the 132 decision vector corresponding to the second receiving antenna compares the calculated MSE with the preset threshold TH. If the MSE is less than the preset threshold TH, the transmission mode of the neighboring cell is considered to be TM2, otherwise it is TM3. . The above process is performed one by one.

In a possible implementation, in the method provided by the embodiment of the present invention, after determining that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is a codebook-based transmission mode, the method further includes: determining a decision reference quantity corresponding to all codebooks in a codebook-based transmission mode, wherein each codebook of each transmission mode corresponds to a decision reference quantity; determining a minimum decision reference quantity among the decision reference quantities corresponding to all codebooks, Determining a codebook corresponding to the minimum decision reference quantity; determining a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs is a transmission mode used by the interfering cell on the PRB, and determining an interference cell according to the codebook corresponding to the minimum decision reference quantity The precoding matrix corresponding to the transmission mode on the PRB indicates the PMI.

In a specific implementation, if the base station implements all two-port transmission modes, after determining that the transmission mode of the interfering cell is a codebook-based transmission mode (eg, TM3, TM4, TM6), it is further required to further determine the transmission of the interfering cell. Mode, since all three transmission modes are based on the codebook transmission mode, the UE needs to know the correct codebook to detect. If the UE adopts the wrong codebook hypothesis, the UE detects the symbol is wrong, if within a PRB. All resources are based on the detection of the wrong codebook hypothesis, so the sequence variance of the detection output will be larger. When judging different transmission modes, it is assumed that the codebooks of _TM3 , _TM4, and TM6 are WTM3, WTM4 _{, m1} , WTM6 _{, m2} , respectively, where m1∈{1,2} under TM4 and m2∈{0 under TM6, 1, 2, 3}, m1, m2 are the codebook numbers of TM4 and TM6, respectively. When determining the transmission mode of the interfering cell, the code sequence of the different modes may be assumed to be the correct codebook one by one to obtain a corresponding decision quantity sequence, and the variance of the detected output sequence is calculated by VAR _TM3 , VAR _TM4 respectively _{. M1} , VAR _{TM6, m2} , the codebook corresponding to the detection output sequence with the smallest variance is determined to be the correct codebook, and the transmission mode corresponding to the correct codebook is determined as the transmission mode of the interfering cell.

As a more preferred embodiment, the transmission mode of the interfering cell and the corresponding codebook can be determined by using the following formula:

Specifically, after calculating the variance, the minimum variance value corresponding to different codebook hypotheses may be first selected in each mode, and then compared between different modes to select the smallest variance value, the minimum variance value. At the same time, the transmission mode of the interfering cell and the corresponding PMI are determined. It is to be noted that after the codebook corresponding to the transmission mode used by the interfering cell is determined, the corresponding PMI may be determined according to the codebook, and the details are not described herein.

In a possible implementation manner, in the method provided by the embodiment of the present invention, if the transmission mode set supported by the interfering cell does not include the transmission mode based on the space frequency block coding SFBC, the interference cell corresponding to the identifier of the interfering cell is determined. After the transmission mode used on the PRB is a CRS-based transmission mode, the method further includes: determining a decision reference amount corresponding to all codebooks in the codebook-based transmission mode, wherein the CRS-based transmission mode includes codebook-based transmission a mode, each codebook of each codebook-based transmission mode corresponds to a decision reference quantity; determining a minimum decision reference quantity of the decision reference quantities corresponding to all codebooks, and determining a codebook corresponding to the minimum decision reference quantity; The transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs is determined as the transmission mode used by the interfering cell on the PRB, and the precoding matrix corresponding to the transmission mode of the interfering cell on the PRB is determined according to the codebook corresponding to the minimum decision reference quantity. Indicates PMI.

Certainly, if the transmission mode of the interfering cell does not include the SFBC-based transmission mode, after determining that the transmission mode of the interfering cell is the CRS-based transmission mode, the transmission mode of the interfering cell may be further determined to be a codebook-based transmission mode. The transmission mode, codebook, and PMI used by the interfering cell can be directly determined and detected.

In a possible implementation manner, in the method provided by the embodiment of the present invention, determining a decision reference quantity corresponding to all codebooks in a codebook-based transmission mode includes: performing, for each transmission in a codebook-based transmission mode. Each codebook of the mode detects a received signal based on the codebook, and determines a sequence of the decision amount corresponding to the codebook according to the received signal, where the sequence of the determined amount includes a determination amount determined by detecting each PDSCH-RE; The variance value of all the judgment quantities in the judgment amount sequence is used as the decision reference amount corresponding to the codebook.

In a specific implementation, the conventional linear detection can be performed based on detecting the received signal for each codebook, and it is not necessary to perform separate detection on each antenna.

As another specific embodiment, it is assumed that in an LTE system, the UE is scheduled to transmit PDSCH data services on PRB0-PRB5, assuming that the number of CRS ports is 2 and CFI=2, which is performed in a regular CP regular subframe. In the transmission, the network side notifies the interfering cell that the transmission mode set is {TM2, TM3, TM4, TM6, TM9}. It is assumed that the UE has learned that the PRB2-PRB5 is interfered by the neighboring cell, and the neighboring cell is not interfered on the PRB0-PRB1, that is, the neighboring cell is the strongest interfering cell.

On PRB2-PRB5, blind detection of the adjacent cell transmission mode is performed on a PRB by PR, and there are 132 PDSCH-REs on each PRB. First, the detection of whether the DMRS exists is performed. If yes, the transmission mode is considered to be TM9. Otherwise, it is determined whether it is the transmission mode 2, and the 132 decision vector corresponding to the first receiving antenna and the 132 decisions corresponding to the second receiving antenna are calculated. The MSE of the quantity vector compares the calculated MSE with the preset threshold TH. If the MSE is less than the preset threshold TH, the transmission mode is considered to be TM2, otherwise the transmission mode is judged in TM3, TM4, and TM6. In each mode, the MMSE or MMSE-IRC detection is performed based on different PMI hypotheses, and the variance of the obtained 132 judgments is calculated, and the minimum variance value corresponding to different PMIs in each mode is selected, thereby simultaneously determining the interference cell. Transmission mode and corresponding PMI. The above process is performed one by one.

The detailed process of the method for determining the transmission mode provided by the embodiment of the present invention is as shown in FIG. 3, and the transmission mode set of the interfering cell is as follows: {TM2, TM3, TM4, TM6, TM9}, including:

Step 302: Determine whether a DMRS exists. That is, whether the DMRS exists in the received signal of each PRB is determined. If yes, step 304 is performed; otherwise, step 306 is performed.

Step 304: If a DMRS exists in the received signal of the PRB, determine that the transmission mode used by the interfering cell on the PRB is TM9.

Step 306: If the DMRS does not exist in the received signal of the PRB, determine that the transmission mode used by the interfering cell on the PRB is a CRS-based transmission mode.

Step 308: When TM2 is included in the transmission mode set of the interfering cell, after determining that the transmission mode used by the interfering cell is a CRS-based transmission mode, determine a transmission mode used by the interfering cell. Whether it is an SFBC-based transmission mode, if yes, step 310 is performed, and if not, step 312 is performed.

Step 310: Determine that the transmission mode used by the interfering cell is an SFBC-based transmission mode, that is, TM2.

Step 312: Determine a transmission mode used by the interfering cell as a codebook-based transmission mode, that is, TM3, TM4, and TM6, and determine a transmission mode used by the interfering cell based on the codebook hypothesis.

The embodiment of the present invention provides a device for determining a transmission mode. As shown in FIG. 4, the method includes: an obtaining unit 402, configured to acquire parameter information for determining a transmission mode of an interfering cell; and a processing unit 404, coupled to the obtaining unit 402, for The parameter information determines a transmission mode used by the interfering cell.

In the device provided by the embodiment of the present invention, the parameter information used to determine the transmission mode of the interfering cell is obtained, and the transmission mode used by the interfering cell is determined according to the obtained parameter information, and the transmission mode of the interfering cell is sent by the network side in the prior art. Compared with the obtained parameter information, the transmission mode of the interfering cell is determined, and the transmission mode of the interfering cell transmission mode can be implemented, and the transmission mode of the interfering cell is not required to be transmitted by the network side, thereby improving the flexibility of the network side. Sex.

In a possible implementation manner, in the apparatus provided by the embodiment of the present invention, the parameter information includes: an identifier of the interfering cell and a set of transmission modes supported by the interfering cell.

In a possible implementation manner, in the apparatus provided by the embodiment of the present invention, the processing unit 404 is specifically configured to: the processing unit 404 determines a physical resource block PRB that has interference in the local cell; and each PRB that has interference in the local cell. The processing unit 404 determines, according to the received signal on the PRB, a transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB in the transmission mode set supported by the interfering cell.

In a possible implementation manner, in the apparatus provided by the embodiment of the present invention, the processing unit 404 determines, according to the received signal on the PRB, the interfering cell corresponding to the identifier of the interfering cell in the transmission mode set supported by the interfering cell on the PRB. The transmission mode used is specifically used when the processing unit 404 determines that the demodulation reference symbol DMRS exists in the received signal on the PRB, and determines that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is DMRS-based transmission. Mode; when the processing unit 404 determines that there is no DMRS in the received signal on the PRB, determining the identity of the interfering cell The transmission mode used by the corresponding interfering cell on the PRB is a transmission mode based on the common reference signal CRS.

In a possible implementation, in the apparatus provided by the embodiment of the present invention, if the transmission mode set supported by the interfering cell includes a transmission mode based on the space frequency block coding SFBC, the processing unit 404 determines the identifier corresponding to the interfering cell. After the transmission mode used by the interfering cell on the PRB is a CRS-based transmission mode, the processing unit 404 is further configured to: for each PRB that has interference in the local cell: the processing unit 404 separately on the first receiving antenna and the second receiving antenna Detecting a received signal, performing joint detection on each of the two adjacent physical downlink shared channel resource units PDSCH-RE in the receiving antenna, and determining a plurality of decision vector vectors corresponding to the receiving antenna; 404 calculates a mean square error MSE of the decision vector vector corresponding to the first receiving antenna and the decision vector corresponding to the second receiving antenna by using the following formula:

The N _{RE is} the number of REs transmitting the PDSCH in the PRB, and the N _RE PDSCH-REs are grouped in advance to obtain N _RE /2 PDSCH-RE groups, where two PDSCHs in each group of PDSCH-REs RE is an adjacent PDSCH-RE, and C _r1 is a decision vector composed of a decision amount obtained by joint detection of each group of PDSCH-REs by the first receiving antenna; C _r2 is a PDSCH-RE using each of the second receiving antennas Performing a judgment amount vector composed of the judgment amount obtained by the joint detection; the processing unit 404 determines, according to the MSE, the network side transmission symbol detected by using the received signal on the first receiving antenna and the network side transmission symbol detected by using the received signal on the second receiving antenna Whether they are the same, if yes, determining that the transmission mode used by the interfering cell on the PRB is an SFBC-based transmission mode; otherwise, determining that the transmission mode used by the interfering cell on the PRB is a codebook-based transmission mode.

In a possible implementation manner, in the apparatus provided by the embodiment of the present invention, the processing unit 404 detects, according to the MSE, that the network side transmission symbol detected by using the received signal on the first receiving antenna is detected by using the received signal on the second receiving antenna. Whether the network side transmission symbols are the same, specifically, the processing unit 404 determines whether the MSE is less than a preset threshold, and if yes, determines that the network side transmission symbol detected by using the received signal on the first receiving antenna and the second receiving antenna are used. Receive signal detected The network side transmits the same symbol. Otherwise, it is determined that the network side transmission symbol detected by the received signal on the first receiving antenna is different from the network side transmission symbol detected by the received signal on the second receiving antenna.

In a possible implementation manner, in the apparatus provided by the embodiment of the present invention, after the processing unit 404 determines that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is a codebook-based transmission mode, the processing unit 404 Also used by: processing unit 404 determines a decision reference amount corresponding to all codebooks in a codebook-based transmission mode, wherein each codebook of each transmission mode corresponds to one decision reference amount; and processing unit 404 determines that all codebooks correspond to Determining a minimum decision reference quantity in the reference quantity, and determining a codebook corresponding to the minimum decision reference quantity; the processing unit 404 determining the transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs as the transmission mode used by the interfering cell on the PRB And determining, according to the codebook corresponding to the minimum decision reference quantity, a precoding matrix indication PMI corresponding to the transmission mode of the interfering cell on the PRB.

In a possible implementation manner, in the apparatus provided by the embodiment of the present invention, if the transmission mode set supported by the interfering cell does not include the transmission mode based on the space frequency block coding SFBC, the processing unit 404 determines the identifier corresponding to the interfering cell. After the transmission mode used by the interfering cell on the PRB is a CRS-based transmission mode, the processing unit 404 is further configured to: the processing unit 404 determine a decision reference quantity corresponding to all the codebooks in the codebook-based transmission mode, where the CRS-based The transmission mode includes a codebook-based transmission mode, and each codebook of each codebook-based transmission mode corresponds to one decision reference quantity; the processing unit 404 determines a minimum decision reference quantity of the decision reference quantities corresponding to all codebooks, and Determining a codebook corresponding to the minimum decision reference quantity; the processing unit 404 determines a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs as a transmission mode used by the interfering cell on the PRB, and determining according to the codebook corresponding to the minimum decision reference quantity The precoding matrix corresponding to the transmission mode of the interfering cell on the PRB indicates the PMI.

In a possible implementation manner, in the apparatus provided by the embodiment of the present invention, the processing unit 404 determines a decision reference quantity corresponding to all the codebooks in the codebook-based transmission mode, specifically for: in the codebook-based transmission mode. Each codebook of each transmission mode: the processing unit 404 detects a received signal based on the codebook, and determines a sequence of the decision amount corresponding to the codebook according to the received signal, the decision order The column includes a decision amount determined by detecting each PDSCH-RE; the processing unit 404 uses the variance value of all the decision amounts in the sequence of the decision amount as the decision reference amount corresponding to the codebook.

The determining mode of the transmission mode provided by the embodiment of the present invention may be integrated into the UE as a part of the UE, where the obtaining unit 402 may use a transceiver, and the processing unit 404 may adopt a CPU processor or the like.

As shown in FIG. 5, the apparatus for determining another transmission mode provided by the embodiment of the present invention includes: a processor 51, a memory 52, a transceiver 53, and a user interface 54, specifically:

The processor 51 is configured to read a program in the memory 52 and perform the following process:

Obtaining parameter information for determining an interference cell transmission mode by the transceiver 53;

A transmission mode used by the interfering cell is determined according to the parameter information.

The transceiver 53 is configured to receive and transmit data under the control of the processor 51.

Here, in FIG. 5, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 51 and various circuits of memory represented by memory 52. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 53 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface 54 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 51 is responsible for managing the bus architecture and the usual processing, and the memory 52 can store data used by the processor 51 when performing operations.

In summary, the method and apparatus for determining a transmission mode according to an embodiment of the present invention can obtain parameter information for determining an interference cell transmission mode, and determine a transmission mode used by an interfering cell according to the acquired parameter information, which can be implemented. The blind detection of the interfering cell transmission mode does not require the network side to transmit the transmission mode of the interfering cell, thereby improving the flexibility of the network side.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may employ an entirely hardware embodiment, an entirely software embodiment, Or in the form of an embodiment of the software and hardware aspects. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims (18)

1. A method for determining a transmission mode, the method comprising:

   Obtaining parameter information used to determine an interference cell transmission mode;

   A transmission mode used by the interfering cell is determined according to the parameter information.
2. The method according to claim 1, wherein the parameter information comprises: an identifier of an interfering cell and a set of transmission modes supported by the interfering cell.
3. The method according to claim 2, wherein determining the transmission mode used by the interfering cell according to the parameter information comprises:

   Determining a physical resource block PRB with interference in the cell;

   For each PRB that has interference in the cell, according to the received signal on the PRB, the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is determined in the transmission mode set supported by the interfering cell.
4. The method according to claim 3, wherein, according to the received signal on the PRB, determining, in the set of transmission modes supported by the interfering cell, an interfering cell corresponding to the identifier of the interfering cell is used on the PRB Transmission mode, including:

   When it is determined that the demodulation reference symbol DMRS exists in the received signal on the PRB, determining that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is a DMRS-based transmission mode;

   When it is determined that there is no DMRS in the received signal on the PRB, it is determined that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is a transmission mode based on a common reference signal CRS.
5. The method according to claim 4, wherein if the transmission mode set supported by the interfering cell includes a transmission mode based on a space frequency block coding SFBC, determining an interference cell corresponding to the identifier of the interfering cell is After the transmission mode used on the PRB is a CRS-based transmission mode, the method further includes:

   For each PRB that has interference in the cell:

   Detecting a received signal on the first receiving antenna and the second receiving antenna, and jointly detecting, for each receiving antenna, two adjacent physical downlink shared channel resource units PDSCH-RE in the receiving antenna, determining the Receiving a plurality of decision vector vectors corresponding to the antenna;

   Calculating a mean squared error MSE of the first received antenna corresponding to the first received antenna and the second receiving antenna corresponding to the determined amount vector using the following formula:

   

   The N _{RE is} the number of REs transmitting the PDSCH in the PRB, and the N _RE PDSCH-REs are grouped in advance to obtain N _RE /2 PDSCH-RE groups, where two PDSCHs in each group of PDSCH-REs RE is an adjacent PDSCH-RE, and C _r1 is a decision vector composed of a decision amount obtained by joint detection of each group of PDSCH-REs by the first receiving antenna; C _r2 is a PDSCH-RE using each of the second receiving antennas a judgment amount vector composed of a judgment amount obtained by joint detection;

   Determining, according to the MSE, whether the network side transmission symbol detected by using the received signal on the first receiving antenna and the network side transmission symbol detected by using the received signal on the second receiving antenna are the same, and if yes, determining an interference cell The transmission mode used on the PRB is an SFBC-based transmission mode; otherwise, it is determined that the transmission mode used by the interfering cell on the PRB is a codebook-based transmission mode.
6. The method according to claim 5, wherein the network side transmitted symbol detected by the received signal on the first receiving antenna and the network detected by using the received signal on the second receiving antenna are determined according to the MSE Whether the side sending symbols are the same, including:

   Determining whether the MSE is less than a preset threshold, and if yes, determining a network side transmission symbol detected by using the received signal on the first receiving antenna and a network side transmitting symbol detected by using the received signal on the second receiving antenna Similarly, otherwise, it is determined that the network side transmission symbol detected by the received signal on the first receiving antenna is different from the network side transmission symbol detected by using the received signal on the second receiving antenna.
7. Method according to claim 5, characterized in that the criterion of the interfering cell is determined After the corresponding interfering cell uses the transmission mode of the codebook on the PRB, the method further includes:

   Determining a decision reference quantity corresponding to all codebooks in a codebook-based transmission mode, wherein each codebook of each transmission mode corresponds to one decision reference quantity;

   Determining a minimum decision reference quantity of the decision reference quantities corresponding to the all codebooks, and determining a codebook corresponding to the minimum decision reference quantity;

   Determining a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs is a transmission mode used by the interfering cell on the PRB, and determining, according to the codebook corresponding to the minimum decision reference quantity, a transmission mode of the interfering cell on the PRB The corresponding precoding matrix indicates the PMI.
8. The method according to claim 4, wherein if the transmission mode supported by the interfering cell does not include a transmission mode based on the space frequency block coding SFBC, the interference cell corresponding to the identifier of the interfering cell is determined to be After the transmission mode used on the PRB is a CRS-based transmission mode, the method further includes:

   Determining a decision reference quantity corresponding to all codebooks in a codebook-based transmission mode, wherein the CRS-based transmission mode includes a codebook-based transmission mode, and each codebook of each codebook-based transmission mode corresponds to one decision reference the amount;

   Determining a minimum decision reference quantity of the decision reference quantities corresponding to the all codebooks, and determining a codebook corresponding to the minimum decision reference quantity;

   Determining a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs is a transmission mode used by the interfering cell on the PRB, and determining, according to the codebook corresponding to the minimum decision reference quantity, a transmission mode of the interfering cell on the PRB The corresponding precoding matrix indicates the PMI.
9. The method according to claim 7 or 8, wherein determining the decision reference quantity corresponding to all the codebooks in the codebook-based transmission mode comprises:

   For each codebook for each transmission mode in a codebook-based transmission mode:

   And detecting, according to the codebook, a received signal sequence, and determining, according to the received signal, a sequence of a decision amount corresponding to the codebook, where the sequence of the determined amount includes a determination amount determined by detecting each PDSCH-RE;

   Determining the variance value of all the judgment quantities in the sequence of the decision quantity as the decision reference corresponding to the codebook the amount.
10. A device for determining a transmission mode, comprising:

    An acquiring unit, configured to acquire parameter information that determines an interference cell transmission mode;

    The processing unit is connected to the obtaining unit, and is configured to determine, according to the parameter information, a transmission mode used by the interfering cell.
11. The apparatus according to claim 10, wherein the parameter information comprises: an identifier of an interfering cell and a set of transmission modes supported by the interfering cell.
12. The device according to claim 11, wherein the processing unit is specifically configured to:

    The processing unit determines a physical resource block PRB that has interference in the local cell;

    For each PRB in the cell that has interference in the cell, the processing unit determines, according to the received signal on the PRB, the interfering cell corresponding to the identifier of the interfering cell in the transmission mode set supported by the interfering cell, on the PRB. Transmission mode.
13. The apparatus according to claim 12, wherein the processing unit determines, according to the received signal on the PRB, an interfering cell corresponding to the identifier of the interfering cell in the set of transmission modes supported by the interfering cell. The transmission mode used on the PRB, specifically for:

    When the processing unit determines that the demodulation reference symbol DMRS exists in the received signal on the PRB, determining that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is a DMRS-based transmission mode;

    When the processing unit determines that there is no DMRS in the received signal on the PRB, it is determined that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is a transmission mode based on a common reference signal CRS.
14. The apparatus according to claim 13, wherein if the transmission mode set supported by the interfering cell includes a transmission mode based on space frequency packet coding SFBC, determining, by the processing unit, the identifier of the interfering cell After the transmission mode used by the interfering cell on the PRB is a CRS-based transmission mode, the processing unit is further configured to:

    For each PRB that has interference in the cell:

    The processing unit detects a received signal on the first receiving antenna and the second receiving antenna, respectively Performing joint detection on each of the two adjacent physical downlink shared channel resource units, PDSCH-RE, for each of the receiving antennas, and determining a plurality of decision vector vectors corresponding to the receiving antennas;

    The processing unit calculates a mean square error MSE of the decision vector vector corresponding to the first receiving antenna and the decision amount vector corresponding to the second receiving antenna by using the following formula:

    

    The N _{RE is} the number of REs transmitting the PDSCH in the PRB, and the N _RE PDSCH-REs are grouped in advance to obtain N _RE /2 PDSCH-RE groups, where two PDSCHs in each group of PDSCH-REs RE is an adjacent PDSCH-RE, and C _r1 is a decision vector composed of a decision amount obtained by joint detection of each group of PDSCH-REs by the first receiving antenna; C _r2 is a PDSCH-RE using each of the second receiving antennas a judgment amount vector composed of a judgment amount obtained by joint detection;

    The processing unit determines, according to the MSE, whether the network side transmission symbol detected by using the received signal on the first receiving antenna and the network side transmission symbol detected by using the received signal on the second receiving antenna are the same, and if yes, Then determining that the transmission mode used by the interfering cell on the PRB is an SFBC-based transmission mode; otherwise, determining that the transmission mode used by the interfering cell on the PRB is a codebook-based transmission mode.
15. The apparatus according to claim 14, wherein said processing unit determines, based on said MSE, a network side transmitted symbol detected by said received signal on said first receiving antenna and a received signal by said second receiving antenna Whether the detected symbols sent by the network side are the same, specifically for:

    Determining, by the processing unit, whether the MSE is less than a preset threshold, and if yes, determining a network side transmission symbol detected by using the received signal on the first receiving antenna and detecting by using a received signal on the second receiving antenna The network side transmits the same symbol. Otherwise, it is determined that the network side transmission symbol detected by the received signal on the first receiving antenna is different from the network side transmission symbol detected by using the received signal on the second receiving antenna.
16. The apparatus according to claim 14, wherein the processing unit determines that the transmission mode used by the interfering cell corresponding to the identifier of the interfering cell on the PRB is based on a codebook After the transmission mode, the processing unit is further configured to:

    The processing unit determines a decision reference amount corresponding to all codebooks in a codebook-based transmission mode, where each codebook of each transmission mode corresponds to one decision reference amount;

    The processing unit determines a minimum decision reference quantity of the decision reference quantities corresponding to the all codebooks, and determines a codebook corresponding to the minimum decision reference quantity;

    The processing unit determines a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs as a transmission mode used by the interfering cell on the PRB, and determines, according to the codebook corresponding to the minimum decision reference quantity, the interfering cell in the PRB The precoding matrix corresponding to the transmission mode on the upper indicates the PMI.
17. The apparatus according to claim 13, wherein if the transmission mode set supported by the interfering cell does not include a transmission mode based on space frequency block coding SFBC, determining, by the processing unit, the identifier corresponding to the interfering cell After the transmission mode used by the interfering cell on the PRB is a CRS-based transmission mode, the processing unit is further configured to:

    The processing unit determines a decision reference amount corresponding to all codebooks in a codebook-based transmission mode, where the CRS-based transmission mode includes a codebook-based transmission mode, and each codebook of each codebook-based transmission mode Corresponding to a decision reference amount;

    The processing unit determines a minimum decision reference quantity of the decision reference quantities corresponding to the all codebooks, and determines a codebook corresponding to the minimum decision reference quantity;

    The processing unit determines a transmission mode to which the codebook corresponding to the minimum decision reference quantity belongs as a transmission mode used by the interfering cell on the PRB, and determines, according to the codebook corresponding to the minimum decision reference quantity, the interfering cell in the PRB The precoding matrix corresponding to the transmission mode on the upper indicates the PMI.
18. The apparatus according to claim 16 or 17, wherein the processing unit determines a decision reference quantity corresponding to all codebooks in a codebook-based transmission mode, specifically for:

    For each codebook for each transmission mode in a codebook-based transmission mode:

    The processing unit detects a received signal based on the codebook, and determines a sequence of the decision amount corresponding to the codebook according to the received signal, where the sequence of the determined amount includes a determination amount determined by detecting each PDSCH-RE;

    The processing unit uses the variance value of all the judgment amounts in the sequence of the judgment amount as the codebook corresponding Decision reference.

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