CN104221313B - Method and apparatus for data transfer - Google Patents

Abstract

Embodiments of the present invention provide a method and device for data transmission. The method includes: determining an estimated uplink channel value of each subband of each cell in the measurement set, wherein the estimated uplink channel value of each subband of each cell in the measurement set is a reference sent by each cell in the measurement set according to user equipment The signal is obtained by measuring; according to the estimated value of the uplink channel of each subband of each cell in the measurement set, determine the SINR of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband, where the The transmission set is a subset of the measurement set; the SINRs of the data streams to be transmitted on each subband are merged to obtain the SINR of the data streams to be transmitted; according to the SINR of the data streams to be transmitted, the MCS of the data streams to be transmitted is determined, so that Each cell in the transmission set sends the data flow to be transmitted to the user equipment according to the MCS. The method and device in the embodiments of the present invention can improve downlink transmission efficiency.

Description

Method and device for data transmission

technical field

The present invention relates to the field of communication, and more particularly, to a method and device for data transmission.

Background technique

The Long Term Evolution (LTE for short) project is the evolution of the third-generation mobile communication technology (3rd-generation, 3G for short). Cell capacity and reduced system latency. Enhanced LTE (LTE-Advanced, referred to as LTE-A) is a subsequent evolution of LTE, fully compatible with LTE, LTE-A introduces many new technologies, such as relay technology, coordinated multi-point transmission, carrier aggregation, etc., can provide Users provide better network experience and more flexible network configuration. Generally, LTE and LTE-A are collectively referred to as LTE technology.

In LTE technology, in order to better adapt to the downlink channel, the user equipment is required to feed back the Channel Quality Index (CQI) of the downlink channel, and the base station selects an appropriate modulation coding scheme (modulation coding scheme, MCS for short) to transmit downlink data. In this way, the quality of the downlink channel can be fully utilized and the transmission efficiency can be maximized.

Wherein, when calculating the CQI, the user equipment needs to pre-assume the transmission mode of the downlink data at the base station side, and then calculate the CQI according to the assumed transmission mode and feed back the CQI to the base station. However, when the base station performs downlink transmission, it may use another transmission mode, resulting in the inability to obtain accurate downlink CQI, so that it cannot determine the appropriate MCS to transmit downlink data, resulting in the inability to fully utilize the quality of the downlink channel, resulting in impaired transmission efficiency .

Contents of the invention

Embodiments of the present invention provide a method and device for data transmission, which can improve downlink transmission efficiency.

In a first aspect, a method for data transmission is provided, including:

Determine the uplink channel estimation value of each subband of each cell in the measurement set, wherein the uplink channel estimation value of each subband of each cell in the measurement set is performed by each cell in the measurement set according to the reference signal sent by the user equipment obtained by measurement;

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the signal-to-interference and noise ratio (SINR) on each subband of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment, wherein the transmission set is a subset of the measurement set;

Combining the SINRs of the data streams to be transmitted on each subband to obtain the SINR of the data streams to be transmitted;

According to the SINR of the data stream to be transmitted, the modulation and coding scheme MCS of the data stream to be transmitted is determined, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining the SINR of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband includes:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the The interference noise power of each subband of the cell outside the cell for the data stream to be transmitted, and determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted, and the Measure the interference noise power of the data stream to be transmitted in each subband of the cells outside the measurement set, and determine the SINR of the data stream to be transmitted on each subband.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the determining the SINR of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband includes:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the measurement set except the transmission set each sub-band of the cell for the interference sequence of the data stream to be transmitted, and determine the interference noise power of each sub-band of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal sequence when the cell in the transmission set transmits the data flow to be transmitted on each subband, the interference sequence of each subband of the cell other than the transmission set in the measurement set for the data flow to be transmitted, and the measurement set For each subband of the outer cell, determine the SINR of the to-be-transmitted data stream on each sub-band with respect to the interference sequence of the to-be-transmitted data stream.

With reference to the first possible implementation of the first aspect or the second possible implementation of the first aspect, in the third possible implementation of the first aspect, the determination of each sub-unit of the cell outside the measurement set Interference noise power with respect to the data stream to be transmitted, including:

Obtain channel quality indicator CQI information obtained by the user equipment according to the downlink data streams transmitted by each cell in the transmission set;

According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment.

With reference to the third possible implementation of the first aspect, in the fourth possible implementation of the first aspect, the CQI information is obtained by the user equipment according to the downlink pilot signal of the serving cell and the Obtained from the signal-to-noise ratio calculated from the interference noise power of other cells;

When the user equipment feeds back CQI information in a transmit diversity manner, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes: according to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back CQI information in a closed-loop mode, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes: according to the formula

determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, there are M cells in the measurement set μ _M , and the cell numbers in the measurement set are m=1, 2, ..., M. When m=1, it is the serving cell, and there are T cells in the transmission set μ _T , and the cell number in the transmission set is t= t ₁ ,t ₂ ,…,t _T , when t=1 is the serving cell, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on the subband sb of the serving cell, V ₁ ^CRS is the virtual antenna mapping matrix of the common reference signal CRS of the serving cell of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on the subband sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the weight used by the last scheduling of the cell m on the subband sb occupied by the user equipment, is the last transmission power of cell m on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on subband sb of cell m.

With reference to the third possible implementation of the first aspect, in the fifth possible implementation of the first aspect, the CQI information is calculated by the user equipment based on the downlink pilot signal of the serving cell and the interference noise power outside the measurement set The signal-to-noise ratio is obtained;

When the user equipment feeds back CQI information in a transmit diversity manner, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back the CQI information in the TM8 closed-loop mode, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back the CQI information in the TM9 closed-loop mode, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the uplink channel estimation value of the subband sb of the serving cell, V ₁ ^CRS is the VAM matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on sb, is based on The mapped signal-to-noise ratio of the downlink data stream s _fb fed back by the user equipment on the subband sb, V ₁ ^CSI-RS is the VAM matrix of the channel state information reference signal CSI-RS of the serving cell.

With reference to the first possible implementation of the first aspect or the second possible implementation of the first aspect, in a sixth possible implementation of the first aspect, each subband of the cell outside the measurement set is determined for the to-be-transmitted SINR of data streams, including:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted, wherein, The ratio of the interference noise power of each subband of the cells other than the transmission set in the measurement set for the data stream to be transmitted to the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted is a constant .

Combining the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, the third possible implementation of the first aspect, the fourth possible implementation of the first aspect Implementation manner, the fifth possible implementation manner of the first aspect or the sixth possible implementation manner of the first aspect, in the seventh possible implementation manner of the first aspect, determining the MCS of the data stream to be transmitted ,include:

According to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, determine the MCS corresponding to the SINR that is closest to or smaller than the SINR of each data stream in the mapping relationship as the data stream for each data stream The SINR of the stream.

In a second aspect, a device for data transmission is provided, including:

The first determination unit is configured to determine the estimated uplink channel value of each subband of each cell in the measurement set, wherein the estimated uplink channel value of each subband of each cell in the measurement set is the estimated value of each subband of each cell in the measurement set according to Obtained by measuring the reference signal sent by the user equipment;

The second determination unit is configured to determine the signal interference and noise on each subband of the data stream to be transmitted that the cell in the transmission set will send to the user equipment according to the uplink channel estimation value of each subband of each cell in the measurement set ratio SINR, wherein the emission set is a subset of the measurement set;

An acquisition unit, configured to combine the SINRs of the data streams to be transmitted on each subband to obtain the SINRs of the data streams to be transmitted;

A third determining unit, configured to determine the modulation and coding scheme MCS of the data stream to be transmitted according to the SINR of the data stream to be transmitted, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS .

With reference to the second aspect, in a first possible implementation manner of the second aspect, the second determining unit is specifically configured to:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the The interference noise power of each subband of the cell outside the cell for the data stream to be transmitted, and determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted, and the Measure the interference noise power of the data stream to be transmitted in each subband of the cells outside the measurement set, and determine the SINR of the data stream to be transmitted on each subband.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the second determination unit is specifically configured to:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the measurement set except the transmission set each sub-band of the cell for the interference sequence of the data stream to be transmitted, and determine the interference noise power of each sub-band of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal sequence when the cell in the transmission set transmits the data flow to be transmitted on each subband, the interference sequence of each subband of the cell other than the transmission set in the measurement set for the data flow to be transmitted, and the measurement set For each subband of the outer cell, determine the SINR of the to-be-transmitted data stream on each sub-band with respect to the interference sequence of the to-be-transmitted data stream.

With reference to the first possible implementation of the second aspect or the second possible implementation of the second aspect, in a third possible implementation of the second aspect, the second determination unit is specifically configured to:

Obtain channel quality indicator CQI information obtained by the user equipment according to the downlink data streams transmitted by each cell in the transmission set;

According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment.

With reference to the third possible implementation of the second aspect, in the fourth possible implementation of the second aspect, the CQI information is obtained by the user equipment according to the downlink pilot signal of the serving cell and the Obtained from the signal-to-noise ratio calculated from the interference noise power of other cells;

When the user equipment feeds back CQI information in a transmit diversity manner, the second determination unit is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back CQI information in a closed-loop mode, the second determining unit is specifically configured to: according to the formula

determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, there are M cells in the measurement set μ _M , and the cell numbers in the measurement set are m=1, 2, ..., M. When m=1, it is the serving cell, and there are T cells in the transmission set μ _T , and the cell number in the transmission set is t= t ₁ ,t ₂ ,…,t _T , when t=1 is the serving cell, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel of the serving cell on the subband sb, V ₁ ^CRS is the virtual antenna mapping matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on the subband sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the weight used by the last scheduling of the cell m on the subband sb occupied by the user equipment, is the last transmission power of cell m on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on subband sb of cell m.

With reference to the third possible implementation of the second aspect, in the fifth possible implementation of the second aspect, the CQI information calculated by the user equipment based on the downlink pilot signal of the serving cell and the interference noise power outside the measurement set The signal-to-noise ratio is obtained;

When the user equipment feeds back CQI information in a transmit diversity manner, the second determination unit is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back the CQI information in a TM8 closed-loop mode, the second determination unit is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back the CQI information in a TM9 closed-loop mode, the second determination unit is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the uplink channel estimation value of the subband sb of the serving cell, V ₁ ^CRS is the VAM matrix of the common reference signal CRS of the serving cell of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on sb, is based on The mapped signal-to-noise ratio of the downlink data stream s _fb fed back by the user equipment on the subband sb, V ₁ ^CSI-RS is the VAM matrix of the CSI-RS of the serving cell.

With reference to the first possible implementation manner or the second possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the second determination unit is specifically configured to:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted, wherein, The ratio of the interference noise power of each subband of the cells other than the transmission set in the measurement set for the data stream to be transmitted to the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted is a constant .

Combining the second aspect, the first possible implementation of the second aspect, the second possible implementation of the second aspect, the third possible implementation of the second aspect, and the fourth possible implementation of the second aspect Implementation manners, the fifth possible implementation manner of the second aspect or the sixth possible implementation manner of the second aspect, and the seventh possible implementation manner of the second aspect, the third determining unit is specifically configured to:

According to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, determine the MCS corresponding to the SINR that is closest to or smaller than the SINR of each data stream in the mapping relationship as the data stream for each data stream The SINR of the stream.

In a third aspect, a device for data transmission is provided, including a receiver, a transmitter, a memory, and a processor, wherein the memory stores program codes, and the processor can call the program codes in the memory to perform the following operate:

The receiver receives the estimated uplink channel value of each subband of each cell in the measurement set, wherein the estimated uplink channel value of each subband of each cell in the measurement set is sent by each cell in the measurement set according to the user equipment obtained by measuring the reference signal;

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the signal-to-interference and noise ratio (SINR) on each subband of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment, wherein the transmission set is a subset of the measurement set;

Combining the SINRs of the data streams to be transmitted on each subband to obtain the SINR of the data streams to be transmitted;

Determine the modulation and coding scheme MCS of the data stream to be transmitted according to the SINR of the data stream to be transmitted;

The transmitter sends the MCS of the data stream to be transmitted to each cell in the transmission set, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the processor invokes the program code stored in the memory to specifically perform the following operations:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the The interference noise power of each subband of the cell outside the cell for the data stream to be transmitted, and determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted, and the Measure the interference noise power of the data stream to be transmitted in each subband of the cells outside the measurement set, and determine the SINR of the data stream to be transmitted on each subband.

With reference to the third aspect, in a second possible implementation manner of the third aspect, the processor invokes the program code stored in the memory to specifically perform the following operations:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the measurement set except the transmission set each sub-band of the cell for the interference sequence of the data stream to be transmitted, and determine the interference noise power of each sub-band of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal sequence when the cell in the transmission set transmits the data flow to be transmitted on each subband, the interference sequence of each subband of the cell other than the transmission set in the measurement set for the data flow to be transmitted, and the measurement set For each subband of the outer cell, determine the SINR of the to-be-transmitted data stream on each sub-band with respect to the interference sequence of the to-be-transmitted data stream.

With reference to the first possible implementation of the third aspect or the second possible implementation of the third aspect, in a third possible implementation of the third aspect, the processor calls the program stored in the memory Specifically, the code does the following:

Obtain channel quality indicator CQI information obtained by the user equipment according to the downlink data streams transmitted by each cell in the transmission set;

According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment.

With reference to the third possible implementation of the third aspect, in the fourth possible implementation of the third aspect, the CQI information is obtained by the user equipment according to the downlink pilot signal of the serving cell and the Obtained from the signal-to-noise ratio calculated from the interference noise power of other cells;

When the user equipment feeds back CQI information in a transmit diversity manner, the processor invokes the program code stored in the memory to specifically perform the following operations:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back CQI information in a closed-loop mode, the processor invokes the program code stored in the memory to specifically perform the following operations:

According to the formula

determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, there are M cells in the measurement set μ _M , and the cell numbers in the measurement set are m=1, 2, ..., M. When m=1, it is the serving cell, and there are T cells in the transmission set μ _T , and the cell number in the transmission set is t= t ₁ ,t ₂ ,…,t _T , when t=1 is the serving cell, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on the subband sb of the serving cell, V ₁ ^CRS is the virtual antenna mapping matrix of the common reference signal CRS of the serving cell of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on the subband sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the weight used by the last scheduling of the cell m on the subband sb occupied by the user equipment, is the last transmission power of cell m on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on subband sb of cell m.

With reference to the third possible implementation of the third aspect, in the fifth possible implementation of the third aspect, the CQI information is calculated by the user equipment based on the downlink pilot signal of the serving cell and the interference noise power outside the measurement set The signal-to-noise ratio is obtained;

When the user equipment feeds back CQI information in a transmit diversity manner, the processor invokes the program code stored in the memory to specifically perform the following operations:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back the CQI information in the TM8 closed-loop mode, the processor invokes the program code stored in the memory to specifically perform the following operations:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back the CQI information in the TM9 closed-loop mode, the processor invokes the program code stored in the memory to specifically perform the following operations:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the uplink channel estimation value of the subband sb of the serving cell, V ₁ ^CRS is the VAM matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on sb, is based on The mapped signal-to-noise ratio of the downlink data stream s _fb fed back by the user equipment on the subband sb, V ₁ ^CSI-RS is the VAM matrix of the channel state information reference signal CSI-RS of the serving cell.

With reference to the first possible implementation manner or the second possible implementation manner of the third aspect, in a sixth possible implementation manner of the third aspect, the processor invokes the program code stored in the memory to specifically execute the following operate:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted, wherein, The ratio of the interference noise power of each subband of the cells other than the transmission set in the measurement set for the data stream to be transmitted to the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted is a constant .

Combining the third aspect, the first possible implementation of the third aspect, the second possible implementation of the third aspect, the third possible implementation of the third aspect, the fourth possible implementation of the third aspect Implementation manner, the fifth possible implementation manner of the third aspect or the sixth possible implementation manner of the third aspect, in the seventh possible implementation manner of the third aspect, the processor calls the Specifically, the program code does the following:

According to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, determine the MCS corresponding to the SINR that is closest to or smaller than the SINR of each data stream in the mapping relationship as the data stream for each data stream The SINR of the stream.

In the embodiment of the present invention, the uplink channel is detected by using the reference signal transmitted by the user equipment, the channel estimation is performed through the reference signal, and the channel estimation information of the uplink channel is obtained. Due to the uplink and downlink reciprocity, the channel estimation of the uplink channel can be used information, calculate the SINR of the downlink data stream, and calculate the MCS for transmitting the downlink data stream according to the SINR of the downlink data stream, which can calculate the downlink MCS more accurately, improve its matching degree with the quality of the downlink channel, and thus improve the downlink Spectral efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the embodiments of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is a schematic flowchart of a method for data transmission according to an embodiment of the present invention.

Fig. 2 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.

Fig. 3 is a schematic block diagram of an apparatus for data transmission according to an embodiment of the present invention.

Fig. 4 is a schematic block diagram of an apparatus for data transmission according to another embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

Fig. 1 is a schematic flowchart of a method 100 for data transmission according to an embodiment of the present invention. As shown in Figure 1, the method 100 includes:

S110. Determine the estimated uplink channel value of each subband of each cell in the measurement set from the user equipment to the user equipment, wherein the estimated uplink channel value of each subband of each cell in the measurement set is each The cell is obtained by measuring the reference signal sent by the user equipment; where the reference signal may be a sounding reference signal (Sounding Reference Signal, SRS for short), or other reference signals, which are not limited in this embodiment of the present invention .

S120, according to the uplink channel estimation value of each subband of each cell in the measurement set, determine the signal to interference plus noise ratio (Signal to Interference plus Noise Ratio, referred to as SINR), where the transmission set is a subset of the measurement set, that is, the cells in the transmission set must belong to the measurement set;

S130. Combine the SINRs of the data streams to be transmitted on each subband to obtain the SINRs of the data streams to be transmitted;

S140. Determine the MCS of the data flow to be transmitted according to the SINR of the data flow to be transmitted, so that each cell in the transmission set sends the data flow to be transmitted to the user equipment according to the MCS.

Embodiments of the present invention can be used in systems featuring "uplink and downlink reciprocity", for example, Worldwide Interoperability for Microwave Access ("WIMAX") system or LTE-Time Division Duplexing (Time Division Duplexing , referred to as "TDD") systems, in these systems, a relatively large feature is that the uplink and downlink occupy the same frequency band, so it can be considered that the uplink and downlink channels are approximate. According to this feature, the user equipment detects the uplink channel by sending a reference signal, such as SRS, and the base station obtains the channel estimation information of the uplink channel through the reference signal. Due to the uplink and downlink reciprocity, the channel estimation information of the uplink channel can be used , calculate the SINR of the downlink data flow, and calculate the MCS for transmitting the downlink data flow according to the SINR of the downlink data flow, so that the cells in the transmission set can send the downlink data flow to the user equipment according to the determined MCS.

Specifically, the user equipment can transmit an SRS to each cell in the measurement set, and each cell in the measurement set can perform measurement according to the SRS sent by the user equipment to obtain an estimated value of the uplink channel of each subband; then, All the cells in the measurement set may send the obtained uplink channel estimation value of each subband to a certain device, for example, the corresponding base station of the serving cell of the user equipment; The estimated value of the uplink channel of the band determines the SINR on each subband of each to-be-transmitted data stream to be transmitted by the cell in the transmission set to the user equipment, wherein the transmission set is a subset of the measurement set; The SINRs of the data streams on each subband are combined to obtain the SINR of each data stream to be transmitted, and then, the device can determine the MCS of each data stream to be transmitted according to the SINR of each data stream to be transmitted, and The MSC of each data flow to be transmitted is notified to the cells in the transmission set; thus, each cell in the transmission set can transmit the corresponding data flow to be transmitted according to the MSC of each data flow to be transmitted.

In the embodiment of the present invention, the execution subject of method 100 may be the base station corresponding to the serving cell of the user equipment, or the base station corresponding to other cells, or may be a device independent of each base station, which is not limited in the present invention, as long as it can It is enough to realize the functions to be realized in the present invention.

In the embodiment of the present invention, according to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, the MCS corresponding to the SINR that is closest to or smaller than the SINR of each data stream in the mapping relationship can be determined is the SINR of each data stream.

In the embodiment of the present invention, the cells in the measurement set can receive and process the reference signal transmitted by the user equipment, and can exchange measurement information. The cells in the measurement set may adopt a fixed allocation method, for example, the measurement set is composed of several cells around the serving cell of the user equipment; it may also be based on the reference signal receiving power (Reference Signal Receiving Power, referred to as RSRP), select a certain number of cells to form a measurement set according to |RSRP ₁ -RSRP _j |<Thr, where RSRP ₁ is the RSRP of the serving cell, RSRP _j is the RSRP of other cells, and Thr is the threshold. Among them, Thr can be determined according to the complexity of product implementation (for example, the complexity of calculation of related parameters of the product), and if the product performance requirements are high, a higher value can be set for it.

In the embodiment of the present invention, the cells in the transmission set are for the user equipment to jointly transmit downlink data, and the cells in the transmission set must be in the measurement set. Among them, there are many joint emission methods, which are generally divided into two categories: coherent emission and non-coherent emission. Coherent transmission requires cells in the transmission set to exchange channel information to calculate transmission weights; non-coherent transmission only requires each cell to calculate transmission weights individually.

In the embodiment of the present invention, the determination in S120 of the SINR of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband may include:

According to the uplink channel estimation value of each sub-band of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each sub-band, and determine each channel in the measurement set except the transmission set. Interference noise power of the subband for the data stream to be transmitted, and determining the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal power when the cell in the transmitting set transmits the data stream to be transmitted on each subband, the interference noise power of each subband of the cell except the transmitting set in the measurement set for the data stream to be transmitted, and the interference noise power outside the measurement set For each subband of the cell, with regard to the interference noise power of the data stream to be transmitted, determine the SINR of the data stream to be transmitted on each subband.

Alternatively, in the embodiment of the present invention, determining in S120 the SINR of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband may include:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the signal sequence of the cells other than the transmission set in the measurement set Each subband is directed at the interference sequence of the data stream to be transmitted, and determining the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal sequence when the cell in the transmission set transmits the data flow to be transmitted on each subband, the interference sequence of each subband of the cell in the measurement set except the transmission set to the data flow to be transmitted, and the interference sequence of the cell outside the measurement set For each subband, with respect to the interference sequence of the data stream to be transmitted, determine the SINR of the data stream to be transmitted on each subband.

It should be understood that, in the embodiment of the present invention, for simplicity of implementation, the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted can be directly set to 0 without calculation, wherein whether to calculate the The interference noise power of each subband of the cell for the data stream to be transmitted can be determined according to the complexity of product implementation (for example, the complexity of calculation of related parameters of the product), or it can be judged according to the size of the measurement set. For example, if the number of cells in the measurement set is greater than a predetermined value and the difference between the number of cells in the measurement set and the number of cells in the transmission set is greater than another predetermined value, each subband of the cell outside the measurement set can be directly assigned to The interference noise power of the data stream to be transmitted is set to 0, wherein, the predetermined value is generally 3, and the other predetermined value is generally 2, which can be determined according to the actual situation, for example, according to the complexity of product implementation (such as , depending on the complexity of calculating the relevant parameters of the product).

If it is necessary to calculate the interference noise power of each subband of a cell outside the measurement set with respect to the data stream to be transmitted, the following two specific implementation methods may be optionally used, but the present invention is not limited thereto.

In the first implementation method, how to determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted may include:

Obtain the CQI information obtained by the user equipment according to the downlink data streams transmitted by each cell in the transmission set; that is, acquire the number and CQI of the downlink data streams recommended by the user equipment to the base station.

According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

According to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment, the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted is determined.

In the embodiment of the present invention, the user equipment will feed back to the base station the number of downlink data streams recommended by the user equipment to the base station and the CQI, that is, the user equipment can recommend the number of downlink data streams used by the base station according to the downlink channel conditions, and each downlink data stream The stream corresponds to CQI information.

In the second implementation method, how to determine the SINR of each subband of the cell outside the measurement set for the data stream to be transmitted may include:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted;

According to the interference noise power of each sub-band of the cell except the transmission set in the measurement set for the data stream to be transmitted, determine the interference noise power of each sub-band of the cell outside the measurement set for the data stream to be transmitted, wherein, except in the measurement set The ratio of the interference noise power of each subband of the cells outside the transmitting set for the data stream to be transmitted to the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted is constant.

Therefore, in the embodiment of the present invention, by determining the estimated uplink channel value of each subband of each cell in the measurement set, where the estimated uplink channel value of each subband of each cell in the measurement set is the It is obtained by measuring the reference signal sent by the user equipment, and according to the estimated value of the uplink channel of each subband of each cell in the measurement set, it is determined that the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment is in each subband SINR on , wherein, the transmission set is a subset of the measurement set, the SINRs of the data streams to be transmitted on each subband are combined to obtain the SINR of the data streams to be transmitted, and according to the SINR of the data streams to be transmitted, determine The MCS of the data stream to be transmitted, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS, that is, by using the reference signal transmitted by the user equipment to detect the uplink channel, and perform channel estimation through the reference signal , to obtain the channel estimation information of the uplink channel, due to the reciprocity of uplink and downlink, the channel estimation information of the uplink channel can be used to calculate the SINR of the downlink data stream, and calculate the MCS for transmitting the downlink data stream according to the SINR of the downlink data stream, The downlink MCS can be calculated more accurately, and the degree of matching between the downlink MCS and the downlink channel quality can be improved, thereby improving the downlink spectrum efficiency.

In order to understand the present invention more clearly, the method for data transmission according to the embodiment of the present invention will be specifically described below with reference to FIG. 2 .

Fig. 2 is a schematic flowchart of a method 200 for data transmission according to an embodiment of the present invention.

Wherein, in the method 200, the measurement set μ _M is composed of M cells, and the numbers of the cells in the measurement set are m=1, 2, ..., M, where the cell m ₁ =1 is the serving cell of the user equipment. The transmission set μ _T is composed of T cells (T≤M), and the numbers of the cells in the transmission set are t=t ₁ , t ₂ ,...,t _T , where cell t=1 is the serving cell of the user equipment. The total transmit antenna power of the cell m in the measurement set μ _M on the subband sb is m=1,2,...,M. The flow number of the downlink data flow sent by the cell in the transmission set μ _T to the target user equipment (UserEquipment, "UE" for short) is S _tx , and the flow number is s _tx =1,2,...,S _tx . The number of downlink data streams fed back by the target UE is S _fb , and the stream number is s _fb =1,2,...,S _fb , wherein, when the target UE adopts the transmission diversity mode (that is, the assumed base station adopted by the user equipment When the transmission mode is transmit diversity mode) to feed back CQI, S _fb =1, when the target UE feeds back CQI in the closed-loop mode (that is, the transmission mode adopted by the base station assumed by the user equipment is the closed-loop mode), S _fb ≥1.

As shown in Figure 2, the method 200 may include:

S201, the cells in the measurement set measure the SRS transmitted by the target UE, and obtain the uplink channel estimation matrix of each sub-band (sub-bandwidth) of each cell Where m=1,2,...,M, sb=1,2,...,N _SB , N _SB is the total number of SBs on the transmission bandwidth, and SB can be a resource block (resource block, RB for short), or A combination of multiple RBs.

S202. Acquire the uplink channel estimation matrix obtained by measuring the SRS by the cells in the measurement set, and the flow s _fb fed back by the uplink channel estimation matrix and the user equipment Calculate the interference power on the sb outside the measurement set corresponding to the flow

in, It can be obtained by the target UE based on the SNR calculated by the downlink pilot signal of the serving cell and the total interference noise power of other cells, or it can be calculated by the target UE based on the downlink pilot signal of the serving cell and the interference noise power outside the measurement set The signal-to-noise ratio is obtained, and the following two situations will be combined for a specific introduction.

1) It is obtained by the target UE based on the signal-to-noise ratio calculated by the downlink pilot signal of the serving cell and the total interference noise power of other cells, that is, the target UE calculates it assuming that there is interference outside the serving cell, and it can be full bandwidth or It is sub-band, that is, it can be understood as the feedback method in R10/R9/R8.

Among them, according to the different feedback methods of the target UE, the calculation can be divided into the following situations

a) When the target UE feeds back when (S _fb =1),

Formula 1

Wherein, T _num is the number of transmitting antennas of the base station, assuming that the number of antennas of all cells is the same, is the last transmission power of the serving cell on the subband sb occupied by the target UE, is the uplink channel estimation matrix of the serving cell on the subband sb, V ₁ ^CRS is the virtual antenna mapping matrix of the common reference signal (Cell-specific reference signals, "CRS" for short) of the serving cell of the target UE, is based on The signal-to-noise ratio of the data stream _sfb fed back by the target UE on the subband sb obtained through mapping, is the weight used for the last scheduling of the cell m on the subband sb occupied by the target UE, is the last transmission power of the cell m on the subband sb occupied by the target UE, is the uplink channel estimation matrix on subband sb of cell m.

b) When the target UE feeds back in closed loop mode When (S _fb ≥ 1),

Formula 2

in, is the precoding vector of the data stream s _fb fed back by the target UE on the subband sb, and the meanings of other parameters are the same as those in a).

2) It is obtained by calculating the signal-to-noise ratio between the downlink pilot signal of the serving cell of the target UE and the interference noise power outside the measurement set, that is, the target UE is calculated only based on the downlink pilot signal of the serving cell and assuming that there is no interference in the measurement set. It can be all The bandwidth can also be subband. (It can be understood as the feedback method in R11)

According to the different feedback methods of the target UE, the calculation is divided into the following situations

a) When the target UE feeds back when (S _fb =1),

Formula 3

Wherein, T _num is the number of transmitting antennas of the base station, assuming that the number of antennas of all cells is the same, is the last transmission power of the serving cell on the subband sb occupied by the target UE, is the uplink channel estimation matrix of the subband sb of the serving cell, V ₁ ^CRS is the virtual antenna mapping (Virtual Antenna Mapping, VAM for short) matrix of the serving cell CRS of the user equipment, is the precoding vector of the data stream s _fb fed back by the user equipment on sb, is based on The signal-to-noise ratio of the data stream s _fb fed back by the user equipment obtained through mapping on the subband sb, V ₁ ^CSI-RS is the VAM matrix of the channel state information reference signal (Channel State Information, referred to as "CSI-RS") of the serving cell .

b) When the target UE feeds back in TM8 closed-loop mode When (S _fb ≥ 1),

Formula 4

in, is the PMI on sb of the data flow s _fb fed back by the target UE to the serving cell, and the meanings of other parameters are the same as those in a).

c) When the target UE feeds back in TM9 closed-loop mode When (S _fb ≥ 1),

Formula 5

Where V ₁ ^CSI-RS is the VAM matrix of the CSI-RS of the serving cell of the target UE, generally V ₁ ^CSI-RS =I, and meanings of other parameters are the same as those in a) and b).

S203, Construct the interference noise power matrix outside the measurement set corresponding to all data streams to be transmitted

Interference noise power outside the measurement set corresponding to the data stream s _tx to be transmitted The following methods can be used.

Average the interference noise power outside the measurement set corresponding to the number of feedback streams to obtain the interference noise power outside the measurement set corresponding to the data stream s _tx to be transmitted which is, Wherein, in this case, the interference noise outside the measurement set is the same for all emission streams.

Optionally, when the number of feedback streams is the same as the number of streams to be transmitted (ie S _tx =S _fb ), That is, according to the interference noise power of each stream can be obtained:

Formula 6

S204, calculate the target UE

Two calculations are presented below method, of course, can also be calculated by other methods This embodiment of the present invention does not limit it.

1) What can be obtained by the first method for:

Formula 7

in, and or Specifically, it may be determined according to the complexity of the implementation, which is not limited in this embodiment of the present invention, or according to Whether it is determined by this scheduling weight, if For this scheduling weight otherwise in, is the transmission weight matrix of cell m on the subband sb occupied by the target UE, which can be the weight used in the last scheduling, or the weight to be used in this scheduling, depending on the implementation complexity. The s _{tx column} of W ₁ ^sb is Indicates the transmission weight vector of the stream _stx transmitted by the serving cell to the target UE in the subband sb.

Optionally, the In addition to being available through S202 and S203, it can also be obtained through to get, where is the interference power in the measurement set, that is,

Formula 8

Wherein, β is an interference proportional coefficient representing the ratio of the interference outside the measurement set to the interference inside the measurement set, and can usually be a constant, where the constant can be obtained through simulation or empirical values.

2) What can be obtained by the second method for:

Formula 9

in, is the s _tx diagonal element of α; or Among them, I is an identity matrix whose value of the diagonal element is 1, and other values are 0. For the meaning of other parameters, please refer to the above description.

Optionally, the In addition to being obtained through steps S202 and S203, it can also be obtained through to get, where is the interference power matrix in the measurement set, namely

Formula 10

β is an interference proportional coefficient that represents the ratio of the interference outside the measurement set to the interference inside the measurement set, and can usually be a constant, wherein the constant can be obtained through simulation or empirical values.

S205, the data flow s _tx to be transmitted on the bandwidth occupied by the target UE on each subband merge to get The merging method may use the SB average method, or the exponential effective SINR mapping (Exponential Effective SINR Mapping, EESM for short) merging method, or other methods, which are not limited in this embodiment of the present invention.

S206, after merging the target UE Mapped to MCS Level L. Each MCS level l corresponds to one looking for satisfaction The maximum l _max , L=l _max .

S207, each cell in the transmission set transmits the downlink data stream s _tx on the scheduled bandwidth according to the selected MCS level L.

It should be understood that the execution subject of steps S202 to S206 in the method 200 may be the base station corresponding to the serving cell of the user equipment, may be a base station corresponding to other cells, or may be a device independent of each base station, which is not limited in the present invention , as long as the functions to be realized by the present invention can be realized.

Therefore, in the embodiment of the present invention, by determining the estimated uplink channel value of each subband of each cell in the measurement set, the estimated value of the uplink channel of each subband of each cell in the measurement set is each cell in the measurement set according to It is obtained by measuring the reference signal sent by the user equipment, and according to the uplink channel estimation value of each subband of each cell in the measurement set, determine the data flow to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband SINR, where the transmission set is a subset of the measurement set, combining the SINRs of the data streams to be transmitted on each subband to obtain the SINR of the data streams to be transmitted, and determining the data streams to be transmitted according to the SINR of the data streams to be transmitted MCS, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS, that is, when determining the MSC used to transmit the downlink data stream, the uplink is detected by using the reference signal transmitted by the user equipment channel, channel estimation is carried out through the reference signal, and the channel estimation information of the uplink channel is obtained. Due to the reciprocity of the uplink and downlink channels, the channel estimation information of the uplink channel can be used to calculate the SINR of the downlink data stream, and the SINR of the downlink data stream can be used for calculation. Based on the MCS transmitting the downlink data stream, the downlink MCS can be calculated more accurately, and the matching degree between it and the downlink channel quality can be improved, thereby improving the downlink spectrum efficiency.

The method for data transmission according to the embodiment of the present invention has been described above with reference to FIG. 1 and FIG. 2 , and the apparatus for data transmission according to the embodiment of the present invention will be described below in conjunction with FIG. 3 and FIG. 4 .

Fig. 3 is a schematic block diagram of an apparatus for data transmission according to an embodiment of the present invention. As shown in Figure 3, the device 300 includes:

The first determining unit 310 is configured to determine the estimated uplink channel value of each subband of each cell in the measurement set, wherein the estimated uplink channel value of each subband of each cell in the measurement set is each cell in the measurement set It is obtained by performing measurement according to the reference signal sent by the user equipment;

The second determination unit 320 is configured to determine the SINR on each subband of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment according to the estimated uplink channel value of each subband of each cell in the measurement set, Wherein, the emission set is a subset of the measurement set;

The acquiring unit 330 is configured to combine the SINRs of the data streams to be transmitted on each subband to obtain the SINRs of the data streams to be transmitted;

The third determining unit 340 is configured to determine the MCS of the data flow to be transmitted according to the SINR of the data flow to be transmitted, so that each cell in the transmission set sends the data flow to be transmitted to the user equipment according to the MCS.

Optionally, the second determining unit 320 is specifically configured to:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the The interference noise power of each subband of the cell outside the cell for the data stream to be transmitted, and determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted, and the Measure the interference noise power of the data stream to be transmitted in each subband of the cells outside the measurement set, and determine the SINR of the data stream to be transmitted on each subband.

Optionally, the second determining unit 320 is specifically configured to:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the measurement set except the transmission set each sub-band of the cell for the interference sequence of the data stream to be transmitted, and determine the interference noise power of each sub-band of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal sequence when the cell in the transmission set transmits the data flow to be transmitted on each subband, the interference sequence of each subband of the cell other than the transmission set in the measurement set for the data flow to be transmitted, and the measurement set For each subband of the outer cell, determine the SINR of the to-be-transmitted data stream on each sub-band with respect to the interference sequence of the to-be-transmitted data stream.

Optionally, the second determining unit 320 is specifically configured to:

Obtaining CQI information obtained by the user equipment according to the transmitted downlink data flow of each cell in the transmission set;

According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment.

Optionally, the CQI information is obtained by the user equipment from a signal-to-noise ratio calculated according to the downlink pilot signal of the serving cell and the interference noise power of other cells except the serving cell;

When the user equipment feeds back CQI information in a transmit diversity manner, the second determining unit 320 is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

When the user equipment feeds back CQI information in a closed-loop mode, the second determining unit is specifically configured to: according to the formula

determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, there are M cells in the measurement set μ _M , and the cell numbers in the measurement set are m=1, 2, ..., M. When m=1, it is the serving cell, and there are T cells in the transmission set μ _T , and the cell number in the transmission set is t= t ₁ ,t ₂ ,…,t _T , when t=1 is the serving cell, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel of the serving cell on the subband sb, V ₁ ^CRS is the virtual antenna mapping matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on the subband sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the weight used by the last scheduling of the cell m on the subband sb occupied by the user equipment, is the last transmission power of cell m on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on subband sb of cell m.

Optionally, the CQI information is obtained by the user equipment based on the signal-to-noise ratio calculated from the downlink pilot signal of the serving cell and the interference noise power outside the measurement set;

When the user equipment feeds back CQI information in a transmit diversity manner, the second determining unit 320 is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

When the user equipment feeds back the CQI information in a TM8 closed-loop mode, the second determination unit is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

When the user equipment feeds back the CQI information in a TM9 closed-loop mode, the second determining unit is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the uplink channel estimation value of the subband sb of the serving cell, V ₁ ^CRS is the VAM matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on sb, is based on The mapped signal-to-noise ratio of the downlink data stream s _fb fed back by the user equipment on the subband sb, V ₁ ^CSI-RS is the VAM matrix of the CSI-RS of the serving cell.

Optionally, the second determining unit 320 is specifically configured to:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted, wherein, The ratio of the interference noise power of each subband of the cells other than the transmission set in the measurement set for the data stream to be transmitted to the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted is a constant .

Optionally, the third determining unit 340 is specifically configured to:

According to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, determine the MCS corresponding to the SINR that is closest to or smaller than the SINR of each data stream in the mapping relationship as the data stream for each data stream The SINR of the stream.

It should be understood that the above-mentioned and other operations and/or functions of each unit in the apparatus 300 for data transmission according to the embodiment of the present invention are for realizing the corresponding processes of the methods in FIG. 1 and FIG. Let me repeat.

Therefore, in the embodiment of the present invention, by determining the estimated uplink channel value of each subband of each cell in the measurement set, where the estimated uplink channel value of each subband of each cell in the measurement set is each It is acquired by the cell according to the reference signal sent by the user equipment, and according to the estimated value of the uplink channel of each subband of each cell in the measurement set, it is determined that the data stream to be transmitted that the cell in the transmission set will send to the user equipment is in each The SINR on the subband, wherein, the transmission set is a subset of the measurement set, and the SINR of the data stream to be transmitted on each subband is combined to obtain the SINR of the data stream to be transmitted, and according to the data stream to be transmitted The SINR of the data stream determines the MCS of the data stream to be transmitted, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS, that is, by using the reference signal transmitted by the user equipment to Detect the uplink channel, perform channel estimation through the reference signal, and obtain the channel estimation information of the uplink channel. Due to the reciprocity of the uplink and downlink channels, the channel estimation information of the uplink channel can be used to calculate the SINR of the downlink data stream, and according to the SINR of the downlink data stream To calculate the MCS for transmitting the downlink data flow, the downlink MCS can be calculated more accurately, and the degree of matching between the downlink MCS and the quality of the downlink channel can be improved, thereby improving the downlink spectrum efficiency.

Fig. 4 is a schematic block diagram of an apparatus 400 for data transmission according to an embodiment of the present invention. As shown in FIG. 4, the apparatus 400 includes: a receiver 410, a transmitter 420, a memory 430, and a processor 440 connected to the receiver 410, the transmitter 420, and the memory 430 respectively. Of course, the device may also include common components such as an antenna and an input and output component, which are not limited in this embodiment of the present invention.

Wherein, the program code is stored in the memory 430, and the processor 440 can call the program code stored in the memory 430 to perform the following operations:

The estimated uplink channel value of each subband of each cell in the measurement set is received by the receiver 410, wherein the estimated uplink channel value of each subband of each cell in the measurement set is transmitted by each cell in the measurement set according to the user equipment. obtained by measuring the reference signal;

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the signal-to-interference and noise ratio (SINR) on each subband of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment, wherein the transmission set is a subset of the measurement set;

Combining the SINRs of the data streams to be transmitted on each subband to obtain the SINR of the data streams to be transmitted;

Determine the modulation and coding scheme MCS of the data stream to be transmitted according to the SINR of the data stream to be transmitted;

The transmitter 440 sends the MCS of the data stream to be transmitted to each cell in the transmission set, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS.

Optionally, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the The interference noise power of each subband of the cell outside the cell for the data stream to be transmitted, and determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted, and the Measure the interference noise power of the data stream to be transmitted in each subband of the cells outside the measurement set, and determine the SINR of the data stream to be transmitted on each subband.

Optionally, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations:

According to the uplink channel estimation value on each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the effective signal sequence in the measurement set except the transmission set Each subband of the cell outside the measurement set is directed at the interference sequence of the data stream to be transmitted, and determining the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted;

According to the effective signal sequence when the cell in the transmission set transmits the data flow to be transmitted on each subband, the interference sequence of each subband of the cell other than the transmission set in the measurement set for the data flow to be transmitted, and the measurement set For each subband of the outer cell, determine the SINR of the to-be-transmitted data stream on each sub-band with respect to the interference sequence of the to-be-transmitted data stream.

Optionally, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations:

Obtaining CQI information obtained by the user equipment according to the transmitted downlink data flow of each cell in the transmission set;

According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment.

Optionally, the CQI information is obtained by the user equipment from a signal-to-noise ratio calculated according to the downlink pilot signal of the serving cell and the interference noise power of other cells except the serving cell;

When the user equipment feeds back CQI information in a transmit diversity manner, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

When the user equipment feeds back CQI information in a closed-loop mode, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations: according to the formula

determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, there are M cells in the measurement set μ _M , and the cell numbers in the measurement set are m=1, 2, ..., M. When m=1, it is the serving cell, and there are T cells in the transmission set μ _T , and the cell number in the transmission set is t= t ₁ ,t ₂ ,…,t _T , when t=1 is the serving cell, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel of the serving cell on the subband sb, V ₁ ^CRS is the virtual antenna mapping matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on the subband sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the weight used by the last scheduling of the cell m on the subband sb occupied by the user equipment, is the last transmission power of cell m on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on subband sb of cell m.

Optionally, the CQI information is obtained by the user equipment based on the signal-to-noise ratio calculated from the downlink pilot signal of the serving cell and the interference noise power outside the measurement set;

When the user equipment feeds back CQI information in a transmit diversity manner, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or,

When the user equipment feeds back the CQI information in the TM8 closed-loop mode, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

When the user equipment feeds back the CQI information in a TM9 closed-loop mode, the second determining unit is specifically configured to:

According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment;

Among them, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the uplink channel estimation value of the subband sb of the serving cell, V ₁ ^CRS is the VAM matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on sb, is based on The mapped signal-to-noise ratio of the downlink data stream s _fb fed back by the user equipment on the subband sb, V ₁ ^CSI-RS is the VAM matrix of the CSI-RS of the serving cell.

Optionally, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations:

According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted;

Determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted, wherein, The ratio of the interference noise power of each subband of the cells other than the transmission set in the measurement set for the data stream to be transmitted to the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted is a constant .

Optionally, the processor 440 may call the program code stored in the memory 430 to specifically perform the following operations:

According to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, determine the MCS corresponding to the SINR that is closest to or smaller than the SINR of each data stream in the mapping relationship as the data stream for each data stream The SINR of the stream.

It should be understood that the above-mentioned and other operations and/or functions of each unit in the apparatus 300 for data transmission according to the embodiment of the present invention are for realizing the corresponding processes of the methods in FIG. 1 and FIG. Let me repeat.

Therefore, in the embodiment of the present invention, by determining the estimated uplink channel value of each subband of each cell in the measurement set, the estimated value of the uplink channel of each subband of each cell in the measurement set is each cell in the measurement set according to It is obtained by measuring the reference signal sent by the user equipment, and according to the uplink channel estimation value of each subband of each cell in the measurement set, determine the data flow to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband SINR, where the transmission set is a subset of the measurement set, the SINRs of the data streams to be transmitted on each subband are combined and processed to obtain the SINR of the data streams to be transmitted, and according to the SINR of the data streams to be transmitted, determine the data streams to be transmitted The MCS of the data stream, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS, that is, by using the reference signal transmitted by the user equipment to detect the uplink channel, and perform channel estimation through the reference signal, Obtain the channel estimation information of the uplink channel. Due to the reciprocity of uplink and downlink, the channel estimation information of the uplink channel can be used to calculate the SINR of the downlink data flow, and the MCS for transmitting the downlink data flow can be calculated according to the SINR of the downlink data flow. The downlink MCS can be calculated more accurately, and the matching degree between it and the downlink channel quality can be improved, so that the downlink spectrum efficiency can be improved.

Those of ordinary skill in the art can realize that, in combination with the various method steps and units described in the embodiments disclosed herein, they can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the possibility of hardware and software For interchangeability, in the above description, the steps and components of each embodiment have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those of ordinary skill in the art may use different methods to implement the described functions for each particular application, but such implementation should not be regarded as exceeding the scope of the present invention.

The methods or steps described in connection with the embodiments disclosed herein may be implemented by hardware, software programs executed by a processor, or a combination of both. The software program can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.

Although the present invention has been described in detail in conjunction with preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those skilled in the art can make various equivalent modifications or replacements to the embodiments of the present invention, and these modifications or replacements should all fall within the scope of the present invention.

Claims (24)

1. A method for data transmission, comprising: Determining the estimated uplink channel value of each subband of each cell in the measurement set, wherein the estimated uplink channel value of each subband of each cell in the measurement set is a reference sent by each cell in the measurement set according to the user equipment obtained by measuring the signal; According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted; According to the uplink channel estimation value of each subband of each cell in the measurement set, and the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted, determine that the cell in the transmission set will send The signal-to-interference and noise ratio SINR of the data stream to be transmitted sent by the user equipment on each subband, wherein the transmission set is a subset of the measurement set; Combining the SINRs of the data streams to be transmitted on each subband to obtain the SINR of the data streams to be transmitted; Determine the modulation and coding scheme MCS of the data stream to be transmitted according to the SINR of the data stream to be transmitted, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS. 2. The method according to claim 1, wherein the determining the SINR of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband comprises: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the The interference noise power of each subband of the cell other than the transmission set for the data stream to be transmitted, and determine the interference noise power of each subband of the cell other than the measurement set for the data stream to be transmitted; According to the effective signal power when the cells in the transmitting set transmit the data streams to be transmitted on each subband, the subbands of the cells other than the transmitting set in the measurement set for the data streams to be transmitted The interference noise power and the interference noise power of the subbands of the cells outside the measurement set determine the SINR of the data stream to be transmitted on each subband with respect to the interference noise power of the data stream to be transmitted. 3. The method according to claim 1, wherein the determining the SINR of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment on each subband comprises: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the transmission Each subband of the cell outside the set is directed at the interference sequence of the data stream to be transmitted, and determining the interference noise power of each subband of the cell outside the set for the data stream to be transmitted; According to the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, the interference of each subband of the cell in the transmission set except the transmission set with respect to the data stream to be transmitted is measured The SINR of the data stream to be transmitted on each subband is determined for the interference noise power of the data stream to be transmitted for each subband of the cell outside the sequence and measurement set. 4. The method according to any one of claims 1 to 3, wherein the determining the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted comprises: Obtain channel quality indicator CQI information obtained by the user equipment according to the downlink data streams transmitted by each cell in the transmission set; According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment ; Determine the interference noise of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment power. 5. The method according to claim 4, wherein the CQI information is information calculated by the user equipment according to the downlink pilot signal of the serving cell and the interference noise power of other cells except the serving cell The noise ratio is obtained; When the user equipment feeds back CQI information in a transmit diversity manner, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back CQI information in a closed-loop mode, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes: according to the formula <mrow><msubsup><mi>P</mi><mrow><mi>o</mi><mi>u</mi><mi>t</mi><mi>s</mi><mi>i</mi><mi>d</mi><mi>e</mi></mrow><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>=</mo><mfrac><mrow><mo>|</mo><mo>|</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup></mrow><mrow><msubsup><mi>SINR</mi><mrow><mi>o</mi><mi>u</mi><mi>t</mi><mi>s</mi><mi>i</mi><mi>d</mi><mi>e</mi></mrow><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup></mrow></mfrac><mo>-</mo><mfrac><mrow><munder><munder><mi>&amp;Sigma;</mi><mrow><mi>m</mi><mo>&amp;Element;</mo><msub><mi>&amp;mu;</mi><mi>M</mi></msub></mrow></munder><mrow><mi>m</mi><mo>&amp;NotElement;</mo><mn>1</mn></mrow></munder><mrow><mo>(</mo><mo>|</mo><mo>|</mo><msup><mrow><mo>(</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>)</mo></mrow><mi>H</mi></msup><mo>(</mo><msqrt><msubsup><mi>P</mi><mrow><mi>m</mi><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mi>m</mi><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>W</mi><mrow><mi>m</mi><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><mo>)</mo></mrow><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup><mo>)</mo></mrow><mrow><mo>|</mo><mo>|</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup></mrow></mfrac></mrow> determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; Among them, there are M cells in the measurement set μ _M , and the cell numbers in the measurement set are m=1, 2, ..., M. When m=1, they are serving cells, and there are T cells in the transmitting set μ _T , and the cell numbers in the transmitting set are t= t ₁ ,t ₂ ,…,t _T , when t=1 is the serving cell, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel of the subband sb of the serving cell, V ₁ ^CRS is the virtual antenna mapping matrix of the common reference signal CRS of the serving cell of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on the subband sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the CQI obtained by the target UE based on the signal-to-noise ratio calculated by the downlink pilot signal of the serving cell and the total interference noise power of other cells, is the weight used for the last scheduling of the cell m on the subband sb occupied by the user equipment, is the last transmission power of the cell m on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on subband sb of cell m. 6. The method according to claim 4, wherein the CQI information is obtained by the user equipment according to the signal-to-noise ratio calculated by the downlink pilot signal of the serving cell and the interference noise power outside the measurement set; When the user equipment feeds back CQI information in a transmit diversity manner, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back the CQI information in the TM8 closed-loop mode, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back the CQI information in the TM9 closed-loop mode, the determination of the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment includes: According to the formula determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; Among them, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel of the subband sb of the serving cell, V ₁ ^CRS is the virtual antenna mapping VAM matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on sb, is based on The signal-to-interference-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the CQI obtained by the target UE based on the signal-to-noise ratio calculated by the downlink pilot signal of the serving cell and the interference noise power outside the measurement set, V ₁ ^CSI-RS is the VAM matrix of the channel state information reference signal CSI-RS of the serving cell. 7. The method according to any one of claims 1 to 3, wherein the determining the SINR of each subband of the cell outside the measurement set for the data stream to be transmitted comprises: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted; Determine the interference noise of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted Power, wherein, the interference noise power of each subband of the cells other than the transmission set in the measurement set for the data stream to be transmitted is the same as the interference noise power of each subband of the cell outside the measurement set for the data to be transmitted The ratio of the interfering noise power of the stream is constant. 8. The method according to any one of claims 1 to 3, wherein the determining the MCS of the data stream to be transmitted comprises: According to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, determine the MCS corresponding to the SINR that is closest to and smaller than the SINR of each data stream in the mapping relationship as the Describe the MCS of the data stream to be transmitted. 9. A device for data transmission, comprising: The first determining unit is configured to determine the estimated uplink channel value of each subband of each cell in the measurement set, wherein the estimated uplink channel value of each subband of each cell in the measurement set is each Obtained by the cell performing measurement according to the reference signal sent by the user equipment; The second determination unit is configured to determine the interference noise power of each subband of a cell outside the measurement set for the data stream to be transmitted according to the estimated value of the uplink channel of each subband of each cell in the measurement set; The second determining unit is further configured to use the estimated uplink channel value of each subband of each cell in the measurement set and the interference of each subband of a cell outside the measurement set with respect to the data stream to be transmitted Noise power, determining the signal-to-interference and noise ratio SINR on each subband of the data stream to be transmitted to be transmitted by the cell in the transmission set to the user equipment, wherein the transmission set is a subset of the measurement set; An acquisition unit, configured to combine the SINRs of the data streams to be transmitted on each subband to obtain the SINRs of the data streams to be transmitted; The third determining unit is configured to determine the modulation and coding scheme MCS of the data stream to be transmitted according to the SINR of the data stream to be transmitted, so that each cell in the transmission set sends a message to the user equipment according to the MCS The data stream to be transmitted. 10. The device according to claim 9, wherein the second determining unit is specifically configured to: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the The interference noise power of each subband of the cell other than the transmission set for the data stream to be transmitted, and determine the interference noise power of each subband of the cell other than the measurement set for the data stream to be transmitted; According to the effective signal power when the cells in the transmission set transmit the data streams to be transmitted on each subband, the subbands of the cells other than the transmission set in the measurement set for the data streams to be transmitted The interference noise power and the interference noise power of the subbands of the cells outside the measurement set determine the SINR of the data stream to be transmitted on each subband with respect to the interference noise power of the data stream to be transmitted. 11. The device according to claim 9, wherein the second determining unit is specifically configured to: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the transmission Each subband of the cell outside the set is aimed at the interference sequence of the data stream to be transmitted, and determining the interference noise power of each subband of the cell outside the set for the data stream to be transmitted; According to the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, the interference of each subband of the cell in the transmission set except the transmission set with respect to the data stream to be transmitted is measured The SINR of the data stream to be transmitted on each subband is determined for the interference noise power of the data stream to be transmitted for each subband of the cell outside the sequence and measurement set. 12. The device according to any one of claims 9 to 11, wherein the second determining unit is specifically configured to: Obtain channel quality indicator CQI information obtained by the user equipment according to the downlink data streams transmitted by each cell in the transmission set; According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment ; Determine the interference noise of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment power. 13. The apparatus according to claim 12, wherein the CQI information is information calculated by the user equipment according to the downlink pilot signal of the serving cell and the interference noise power of other cells except the serving cell The noise ratio is obtained; When the user equipment feeds back CQI information in a transmit diversity manner, the second determining unit is specifically configured to: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back CQI information in a closed-loop mode, the second determination unit is specifically configured to: according to the formula <mrow><msubsup><mi>P</mi><mrow><mi>o</mi><mi>u</mi><mi>t</mi><mi>s</mi><mi>i</mi><mi>d</mi><mi>e</mi></mrow><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>=</mo><mfrac><mrow><mo>|</mo><mo>|</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup></mrow><mrow><msubsup><mi>SINR</mi><mrow><mi>o</mi><mi>u</mi><mi>t</mi><mi>s</mi><mi>i</mi><mi>d</mi><mi>e</mi></mrow><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup></mrow></mfrac><mo>-</mo><mfrac><mrow><munder><munder><mi>&amp;Sigma;</mi><mrow><mi>m</mi><mo>&amp;Element;</mo><msub><mi>&amp;mu;</mi><mi>M</mi></msub></mrow></munder><mrow><mi>m</mi><mo>&amp;NotElement;</mo><mn>1</mn></mrow></munder><mrow><mo>(</mo><mo>|</mo><mo>|</mo><msup><mrow><mo>(</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>)</mo></mrow><mi>H</mi></msup><mo>(</mo><msqrt><msubsup><mi>P</mi><mrow><mi>m</mi><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mi>m</mi><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>W</mi><mrow><mi>m</mi><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><mo>)</mo></mrow><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup><mo>)</mo></mrow><mrow><mo>|</mo><mo>|</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup></mrow></mfrac></mrow> determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; Among them, there are M cells in the measurement set μ _M , and the cell numbers in the measurement set are m=1, 2, ..., M. When m=1, they are serving cells, and there are T cells in the transmitting set μ _T , and the cell numbers in the transmitting set are t= t ₁ ,t ₂ ,…,t _T , when t=1 is the serving cell, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on the subband sb of the serving cell, V ₁ ^CRS is the virtual antenna mapping matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on the subband sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the CQI obtained by the target UE based on the signal-to-noise ratio calculated by the downlink pilot signal of the serving cell and the total interference noise power of other cells, is the weight used for the last scheduling of the cell m on the subband sb occupied by the user equipment, is the last transmission power of the cell m on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on subband sb of cell m. 14. The apparatus according to claim 12, wherein the CQI information is obtained by the user equipment according to the signal-to-noise ratio calculated from the downlink pilot signal of the serving cell and the interference noise power outside the measurement set; When the user equipment feeds back CQI information in a transmit diversity manner, the second determining unit is specifically configured to: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back the CQI information in a TM8 closed-loop mode, the second determining unit is specifically configured to: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back the CQI information in a TM9 closed-loop mode, the second determining unit is specifically configured to: According to the formula determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; Among them, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel of the subband sb of the serving cell, V ₁ ^CRS is the virtual antenna mapping VAM matrix of the common reference signal CRS of the serving cell of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the CQI obtained by the target UE based on the signal-to-noise ratio calculated by the downlink pilot signal of the serving cell and the interference noise power outside the measurement set, V ₁ ^CSI-RS is the VAM matrix of the channel state information reference signal CSI-RS of the serving cell. 15. The device according to any one of claims 9 to 11, wherein the second determination unit is specifically configured to: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted; Determine the interference noise of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted Power, wherein, the interference noise power of each subband of the cells other than the transmission set in the measurement set for the data stream to be transmitted is the same as the interference noise power of each subband of the cell outside the measurement set for the data to be transmitted The ratio of the interfering noise power of the stream is constant. 16. The device according to any one of claims 9 to 11, wherein the third determining unit is specifically configured to: According to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, determine the MCS corresponding to the SINR that is closest to and smaller than the SINR of each data stream in the mapping relationship as the Describe the MCS of the data stream to be transmitted. 17. A device for data transmission, comprising a receiver, a transmitter, a memory, and a processor, wherein the memory stores program codes, and the processor invokes the program in the memory The code does the following: The uplink channel estimation value of each subband of each cell in the measurement set is received by the receiver, wherein the uplink channel estimation value of each subband of each cell in the measurement set is based on each cell in the measurement set Obtained by measuring the reference signal sent by the user equipment; According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted; According to the uplink channel estimation value of each subband of each cell in the measurement set, and the interference noise power of each subband of the cell outside the measurement set for the data stream to be transmitted, determine that the cell in the transmission set will send The signal-to-interference and noise ratio SINR of the data stream to be transmitted sent by the user equipment on each subband, wherein the transmission set is a subset of the measurement set; Combining the SINRs of the data streams to be transmitted on each subband to obtain the SINR of the data streams to be transmitted; Determine the modulation and coding scheme MCS of the data stream to be transmitted according to the SINR of the data stream to be transmitted; The transmitter sends the MCS of the data stream to be transmitted to each cell in the transmission set, so that each cell in the transmission set sends the data stream to be transmitted to the user equipment according to the MCS. 18. The device according to claim 17, wherein the processor invokes the program code stored in the memory to specifically perform the following operations: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal power when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the The interference noise power of each subband of the cell other than the transmission set for the data stream to be transmitted, and determine the interference noise power of each subband of the cell other than the measurement set for the data stream to be transmitted; According to the effective signal power when the cells in the transmitting set transmit the data streams to be transmitted on each subband, the subbands of the cells other than the transmitting set in the measurement set for the data streams to be transmitted The interference noise power and the interference noise power of the subbands of the cells outside the measurement set determine the SINR of the data stream to be transmitted on each subband with respect to the interference noise power of the data stream to be transmitted. 19. The device according to claim 17, wherein the processor invokes the program code stored in the memory to specifically perform the following operations: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, and determine the transmission Each subband of the cell outside the set is directed at the interference sequence of the data stream to be transmitted, and determining the interference noise power of each subband of the cell outside the set for the data stream to be transmitted; According to the effective signal sequence when the cell in the transmission set transmits the data stream to be transmitted on each subband, the interference of each subband of the cell in the transmission set except the transmission set with respect to the data stream to be transmitted is measured The SINR of the data stream to be transmitted on each subband is determined for the interference noise power of the data stream to be transmitted for each subband of the cell outside the sequence and measurement set. 20. The device according to any one of claims 17 to 19, wherein the processor invokes the program code stored in the memory to specifically perform the following operations: Obtain channel quality indicator CQI information obtained by the user equipment according to the downlink data streams transmitted by each cell in the transmission set; According to the CQI information and the uplink channel estimation value corresponding to each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment ; Determine the interference noise of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment power. 21. The apparatus according to claim 20, wherein the CQI information is information calculated by the user equipment according to the downlink pilot signal of the serving cell and the interference noise power of other cells except the serving cell The noise ratio is obtained; When the user equipment feeds back CQI information in a transmit diversity manner, the processor invokes the program code stored in the memory to specifically perform the following operations: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back CQI information in a closed-loop mode, the processor invokes the program code stored in the memory to specifically perform the following operations: According to the formula <mrow><msubsup><mi>P</mi><mrow><mi>o</mi><mi>u</mi><mi>t</mi><mi>s</mi><mi>i</mi><mi>d</mi><mi>e</mi></mrow><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>=</mo><mfrac><mrow><mo>|</mo><mo>|</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup></mrow><mrow><msubsup><mi>SINR</mi><mrow><mi>o</mi><mi>u</mi><mi>t</mi><mi>s</mi><mi>i</mi><mi>d</mi><mi>e</mi></mrow><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup></mrow></mfrac><mo>-</mo><mfrac><mrow><munder><munder><mi>&amp;Sigma;</mi><mrow><mi>m</mi><mo>&amp;Element;</mo><msub><mi>&amp;mu;</mi><mi>M</mi></msub></mrow></munder><mrow><mi>m</mi><mo>&amp;NotElement;</mo><mn>1</mn></mrow></munder><mrow><mo>(</mo><mo>|</mo><mo>|</mo><msup><mrow><mo>(</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>)</mo></mrow><mi>H</mi></msup><mo>(</mo><msqrt><msubsup><mi>P</mi><mrow><mi>m</mi><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mi>m</mi><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>W</mi><mrow><mi>m</mi><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><mo>)</mo></mrow><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup><mo>)</mo></mrow><mrow><mo>|</mo><mo>|</mo><msqrt><msubsup><mi>P</mi><mrow><mn>1</mn><mo>,</mo><mi>l</mi><mi>a</mi><mi>s</mi><mi>t</mi></mrow><mrow><mi>s</mi><mi>b</mi></mrow></msubsup></msqrt><msubsup><mi>H</mi><mn>1</mn><mrow><mi>s</mi><mi>b</mi></mrow></msubsup><msubsup><mi>V</mi><mn>1</mn><mrow><mi>C</mi><mi>R</mi><mi>S</mi></mrow></msubsup><msubsup><mi>PMI</mi><mn>1</mn><mrow><msub><mi>s</mi><mrow><mi>f</mi><mi>b</mi></mrow></msub><mo>,</mo><mi>s</mi><mi>b</mi></mrow></msubsup><mo>|</mo><msubsup><mo>|</mo><mi>F</mi><mn>2</mn></msubsup></mrow></mfrac></mrow> determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; Among them, there are M cells in the measurement set μ _M , and the cell numbers in the measurement set are m=1, 2, ..., M. When m=1, they are serving cells, and there are T cells in the transmitting set μ _T , and the cell numbers in the transmitting set are t= t ₁ ,t ₂ ,…,t _T , when t=1 is the serving cell, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel of the serving cell on the subband sb, V ₁ ^CRS is the virtual antenna mapping matrix of the common reference signal CRS of the serving cell of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on the subband sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the CQI obtained by the target UE based on the signal-to-noise ratio calculated by the downlink pilot signal of the serving cell and the total interference noise power of other cells, is the weight used for the last scheduling of the cell m on the subband sb occupied by the user equipment, is the last transmission power of the cell m on the subband sb occupied by the user equipment, is the estimated value of the uplink channel on subband sb of cell m. 22. The device according to claim 20, wherein the CQI information is obtained by the user equipment based on the signal-to-noise ratio calculated by the user equipment based on the downlink pilot signal of the serving cell and the interference noise power outside the measurement set; When the user equipment feeds back CQI information in a transmit diversity manner, the processor invokes the program code stored in the memory to specifically perform the following operations: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back the CQI information in the TM8 closed-loop mode, the processor invokes the program code stored in the memory to specifically perform the following operations: According to the formula Determine the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; or, When the user equipment feeds back the CQI information in a TM9 closed-loop mode, the processor invokes the program code stored in the memory to specifically perform the following operations: According to the formula determining the interference noise power of each subband of the cell outside the measurement set for the downlink data stream fed back by the user equipment; Among them, T _num is the number of transmitting antennas of the base station, is the last transmission power of the serving cell on the subband sb occupied by the user equipment, is the estimated value of the uplink channel of the subband sb of the serving cell, V ₁ ^CRS is the virtual antenna mapping VAM matrix of the serving cell CRS of the user equipment, is the precoding vector of the downlink data stream s _fb fed back by the user equipment on sb, is based on The signal-to-noise ratio of the downlink data stream _sfb fed back by the user equipment on the subband sb obtained through mapping, is the CQI obtained by the target UE based on the signal-to-noise ratio calculated by the downlink pilot signal of the serving cell and the interference noise power outside the measurement set, V ₁ ^CSI-RS is the VAM matrix of the channel state information reference signal CSI-RS of the serving cell. 23. The device according to any one of claims 17 to 19, wherein the processor invokes the program code stored in the memory to specifically perform the following operations: According to the uplink channel estimation value of each subband of each cell in the measurement set, determine the interference noise power of each subband of the cell except the transmission set in the measurement set for the data stream to be transmitted; Determine the interference noise of each subband of the cell outside the measurement set for the data stream to be transmitted according to the interference noise power of each subband of the cell other than the transmission set in the measurement set for the data stream to be transmitted Power, wherein, the interference noise power of each subband of the cells other than the transmission set in the measurement set for the data stream to be transmitted is the same as the interference noise power of each subband of the cell outside the measurement set for the data to be transmitted The ratio of the interfering noise power of the stream is constant. 24. The device according to any one of claims 17 to 19, wherein the processor invokes the program code stored in the memory to specifically perform the following operations: According to the SINR of each data stream in the data stream to be transmitted, and the mapping relationship between SINR and MCS, determine the MCS corresponding to the SINR that is closest to and smaller than the SINR of each data stream in the mapping relationship as the Describe the MCS of the data stream to be transmitted.