WO2017049981A1

WO2017049981A1 - Channel quality indicator determination system and method in coordinated multi-point communication

Info

Publication number: WO2017049981A1
Application number: PCT/CN2016/087771
Authority: WO
Inventors: 鲍坤超; 曲秉玉; 谭婷
Original assignee: 华为技术有限公司
Priority date: 2015-09-25
Filing date: 2016-06-29
Publication date: 2017-03-30
Also published as: CN106559168A; CN106559168B

Abstract

Provided are a channel quality indicator (CQI) determination system and method in coordinated multiple point communication for enabling a UE to report an accurate CQI to a base station in coordinated multi-point communication without increasing downlink pilot signal overheads. The method comprises: receiving, by a UE, scheduling information transmitted by a base station, wherein the scheduling information comprises first information configured to instruct the UE to measure an instantaneous CQI value in an nth subframe and report the instantaneous CQI value in an n+Kth subframe, n is a positive integer, K is a predetermined value, and the nth subframe is a subframe where the base station performs coordinated multi-point (CoMP) transmission scheduling for the UE; and measuring, by the UE, the instantaneous CQI value in the nth subframe, and reporting the instantaneous CQI value to the base station in the n+Kth subframe.

Description

Channel quality indicator CQI determination system and method in cooperative multi-point communication

This application claims the priority of the Chinese patent application filed on September 25, 2015, the Chinese Patent Office, the application number is 201510624690.2, and the invention name is “CQI Determination System and Method for Channel Quality Indicators in Cooperative Multipoint Communication”. The citations are incorporated herein by reference.

Technical field

The present invention relates to the field of communications, and in particular, to a channel quality indicator CQI determining system and method for cooperative multipoint communication, a user equipment, and a base station.

Background technique

In the Long Term Evolution (LTE) system, the same-frequency networking technology is used to improve the spectrum utilization. This requires the introduction of downlink interference control technology and downlink coordinated multi-point transmission (Downlink Coordinated Multiple Points Transmission). The DL CoMP technology is introduced as a downlink co-channel interference control technology. By coordinating the configuration of time-frequency resources, power resources, and airspace resources of multiple cells, the DL CoMP technology can solve the cell in a network with strong downlink interference between the same-frequency cells. The downlink spectrum efficiency and downlink throughput of edge users are limited by the problem of interference between adjacent cells, thereby improving the throughput of cell edge users and improving high-speed service coverage.

In terms of implementation, DL CoMP technology includes four modes, namely Joint Transmit (JT) mode, Dynamic Point Blanking (DPB) mode, and Dynamic Piont Selection (DPS) mode. And Coordinated Beamforming (CBF) mode. For the four DL CoMP modes, the existing R8/R9/R10 User Equipment (UE) is based on a cell-specific reference signal (CRS) or channel state information measurement reference signal (Channel State Information Reference). Signal, CSI-RS) performs channel quality indicator (CQI) measurement. Since the UE does not measure the CQI based on the CoMP mode corresponding to the UE, the UE cannot accurately measure the CQI in the CoMP mode corresponding to the UE. Third generation cooperation project (3rd Generation Partnership Project, 3GPP) The R11 protocol proposes a transmission mode TM10, which enhances CQI measurement in several modes of DL CoMP by adding multiple sets of Channel State information (CSI) measurement configurations. Although the transmission mode can measure the CQI under part of DL CoMP, it greatly increases the overhead of the pilot signal.

In summary, since the existing R8/R9/R10 UE cannot accurately measure the CQI in the CoMP mode corresponding to the UE, the existing R11/R12 UE can measure the CQI under part of the DL CoMP, but the added downlink pilot signal The overhead is too large, so the UE cannot report the accurate CQI to the base station without increasing the overhead of the downlink pilot signal.

Summary of the invention

The present invention provides a channel quality indicator CQI determining system and method for cooperative multipoint communication, a user equipment, and a base station for implementing coordinated multipoint communication without increasing the overhead of downlink pilot signals. The UE reports the accurate CQI to the base station.

In a first aspect, a method for determining a channel quality indicator CQI in coordinated multipoint communication according to an embodiment of the present invention includes:

The user equipment UE receives scheduling information sent by the base station, where the scheduling information includes first information, where the first information is used to indicate that the UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where n is A positive integer, K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission on the UE to perform CoMP mode scheduling;

The UE measures the CQI instantaneous value in the nth subframe and reports the CQI instantaneous value to the base station in the n+Kth subframe.

In this way, the CQI instantaneous value reported by the UE to the base station is measured by the UE based on the COMP mode corresponding to the nth subframe, and the CQI instantaneous value measured by the UE is consistent with the COMP mode corresponding to the nth subframe, and the UE adopts the aperiodic reporting CQI. In this way, the UE can report the accurate CQI in the COMP mode corresponding to the nth subframe UE to the base station.

With reference to the first aspect, in a first possible implementation manner, the scheduling information further includes second information, where the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe;

The UE measures the CQI instantaneous value in the nth subframe, including:

The UE measures the CQI instantaneous value under the scheduling bandwidth in the nth subframe.

In this way, the second information indicates that the UE measures the measurement bandwidth of the CQI instantaneous value, and the measurement bandwidth is the scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe, and the UE performs the CQI instantaneous value according to the measurement bandwidth indicated by the second information.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the scheduling information further includes third information, where the third information is used to indicate that the UE performs beam assignment in the nth subframe. Transmission scheduling of the BF mode;

The CQI instantaneous value of the UE in the nth subframe measurement scheduling bandwidth, including:

The UE demodulates the CQI instantaneous value of the reference signal DMRS on the BF mode-based scheduling bandwidth in the nth subframe measurement.

In this way, the third information indicates that the UE measures the subcarrier position of the CQI instantaneous value, and the subcarrier position is the DMRS on the scheduling bandwidth of the BF mode, and the UE performs the CQI instantaneous value according to the subcarrier position indicated by the third information.

With reference to the first aspect, in a third possible implementation manner, the UE measures the CQI instantaneous value in the nth subframe, including:

The UE measures the CQI instantaneous value at the full bandwidth of the system in the nth subframe.

In conjunction with the third possible implementation of the first aspect, in a fourth possible implementation manner of the first aspect, the scheduling information further includes third information, where the third information is used to indicate that the UE performs beam assignment in the nth subframe. Transmission scheduling of the BF mode;

The CQI instantaneous value of the UE in the n-th subframe measurement system full bandwidth, including:

The UE measures the CQI instantaneous value of the cell reference signal CRS on the full bandwidth of the BF mode based system in the nth subframe.

In this way, the third information indicates that the UE measures the subcarrier position of the CQI instantaneous value, and the subcarrier position is the CRS on the full bandwidth of the system in the BF mode, and the UE performs the CQI instantaneous value according to the subcarrier position indicated by the second information.

In the manner in which the above two UEs measure the instantaneous value of the CQI, the measurement band indicated by the first UE at the base station The CQI instantaneous value is measured on the width, and the second UE defaults to measure the CQI instantaneous value on the full bandwidth of the system. Compared with the second measurement method, the first measurement method narrows the measurement bandwidth range, making the measured CQI instantaneous value more accurate, and reducing the measurement overhead as the measurement bandwidth range is reduced.

In a second aspect, a method for determining a channel quality indicator CQI in cooperative multipoint communication according to an embodiment of the present invention includes:

The base station sends scheduling information to the user equipment UE, where the scheduling information includes first information, where the first information is used to indicate that the UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where n is a positive integer. K is a preset value, and the nth subframe is a subframe in which the base station performs multi-point coordinated transmission of the CoMP mode by the base station;

The base station receives the CQI instantaneous value reported by the UE in the n+Kth subframe.

In this way, the CQI instantaneous value reported by the base station to receive the UE is measured by the UE based on the COMP mode corresponding to the nth subframe, and the CQI instantaneous value measured by the UE is consistent with the COMP mode corresponding to the nth subframe, and the UE adopts the aperiodic reporting CQI. In this way, the base station can determine the accurate CQI in the COMP mode corresponding to the nth subframe UE. In addition, the base station can use the CQI instantaneous value reported by the UE to perform a modulation and coding scheme (MCS) selection, so that the selected MCS matches the channel of the nth subframe, and the user's throughput is maximized. The base station may also use the CQI instantaneous value reported by the UE to perform MCS selection on other subframes (the CoMP mode corresponding to the other subframes is the same as the CoMP mode corresponding to the nth subframe), so that the enhanced UE measures the accuracy of the CQI. Increase the throughput of edge users.

With reference to the second aspect, in a first possible implementation manner, the scheduling information further includes second information, where the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe.

In this way, the base station instructs the UE to measure the measurement bandwidth of the CQI instantaneous value by using the second information, where the measurement bandwidth is the scheduling bandwidth of the base station performing the CoMP mode scheduling on the UE in the nth subframe, and the UE may perform the CQI according to the measurement bandwidth indicated by the second information. Instantaneous value.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the scheduling information further includes third information, where the third information is used to indicate that the UE is in the nth sub The frame performs beam scheduling BF mode transmission scheduling.

In this way, the base station indicates, by using the third information, the UE to measure the subcarrier position of the CQI instantaneous value, where the subcarrier position is the CRS on the full bandwidth of the DMRS or BF mode on the scheduling bandwidth of the BF mode, and then the UE indicates according to the third information. The subcarrier position is the CQI instantaneous value.

In a third aspect, a user equipment UE provided by the embodiment of the present invention includes:

The receiving unit is configured to receive scheduling information sent by the base station, where the scheduling information includes first information, where the first information is used to indicate that the UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where n is A positive integer, K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission on the UE to perform CoMP mode scheduling;

a processing unit, configured to measure a CQI instantaneous value in the nth subframe according to the scheduling information received by the receiving unit;

And a sending unit, configured to report, according to the scheduling information received by the receiving unit, the CQI instantaneous value measured by the processing unit to the base station in the n+Kth subframe.

With reference to the third aspect, in a first possible implementation manner, the scheduling information further includes second information, where the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe;

The processing unit is specifically used to:

The instantaneous value of CQI under the scheduled bandwidth is measured in the nth subframe.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the scheduling information further includes third information, where the third information is used to indicate that the UE performs beam assignment in the nth subframe. Transmission scheduling of the BF mode;

When the processing unit measures the CQI instantaneous value under the scheduling bandwidth in the nth subframe, it is specifically used to:

The CQI instantaneous value of the reference signal DMRS is demodulated on the BF mode-based scheduling bandwidth in the nth subframe measurement.

In combination with the third aspect, in a third possible implementation, the processing unit is specifically configured to:

The instantaneous value of CQI at the full bandwidth of the system is measured at the nth subframe.

With the third possible implementation of the third aspect, in a fourth possible implementation manner of the third aspect, the scheduling information further includes third information, where the third information is used to indicate that the UE performs beam assignment in the nth subframe. Transmission scheduling of the BF mode;

When the processing unit measures the instantaneous value of CQI under the full bandwidth of the system in the nth subframe, it is specifically used to:

The CQI instantaneous value of the cell reference signal CRS on the full bandwidth of the BF mode based system is measured in the nth subframe.

In a fourth aspect, a base station provided by the embodiment of the present invention includes:

The processing unit is configured to determine scheduling information, where the scheduling information includes first information, where the first information is used to indicate that the user equipment UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where n is positive An integer, K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission of the CoMP mode by the base station;

a sending unit, configured to send, to the UE, scheduling information determined by the processing unit;

And a receiving unit, configured to receive a CQI instantaneous value reported by the UE in the n+Kth subframe.

With reference to the fourth aspect, in a first possible implementation, the scheduling information further includes second information, where the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the scheduling information further includes third information, where the third information is used to indicate that the UE is in the nth sub The frame performs beam scheduling BF mode transmission scheduling.

In a fifth aspect, a channel quality indicator CQI determining system for cooperative multipoint communication provided by an embodiment of the present invention includes a user equipment UE and a base station,

The UE includes the UE according to any one of the first to fourth possible implementation manners of the third aspect, the third aspect;

The base station comprises a base station according to any of the first to second possible implementations of the fourth aspect, the fourth aspect.

In the technical solution provided by the embodiment of the present invention, the base station sends the scheduling information to the UE; the UE measures the instantaneous value of the CQI of the nth subframe according to the indication of the scheduling information, and adopts a non-periodic reporting manner, that is, in the n+Kth subframe. The measured CQI instantaneous value is reported to the base station, where the nth subframe is a subframe in which the base station performs CoMP mode scheduling on the UE, and the CQI instantaneous value is measured by the UE based on the COMP mode corresponding to the nth subframe, and the CQI measured by the UE The instantaneous value is consistent with the COMP mode corresponding to the nth subframe. Therefore, the technical solution provided by the embodiment of the present invention can enable the UE to report the nth subcarrier to the base station. The accurate CQI in the COMP mode corresponding to the frame UE.

DRAWINGS

FIG. 1(a) is a schematic diagram of transmission of a DPS mode according to an embodiment of the present invention;

FIG. 1(b) is a schematic diagram of transmission of a DPB mode according to an embodiment of the present invention;

FIG. 1(c) is a schematic diagram of transmission of a JT mode according to an embodiment of the present invention;

FIG. 1(d) is a schematic diagram of transmission of a CBF mode according to an embodiment of the present invention;

2 is a schematic flowchart of a CQI determining method in cooperative multipoint communication according to an embodiment of the present invention;

3 is a schematic flowchart of a CQI determining method in cooperative multipoint communication according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of interaction between a base station and a UE in a CQI determining method in coordinated multipoint communication according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of interaction between a base station and a UE in a CQI determining method in coordinated multipoint communication according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a UE according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a CQI determining system in cooperative multipoint communication according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a UE according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a base station according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the invention provides a method and a device for determining a channel quality indicator CQI in cooperative multi-point communication, so as to implement a coordinated CQI for a UE to perform coordinated multi-point communication without increasing the downlink pilot signal overhead. The method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.

The technical solution provided by the embodiment of the present invention relates to downlink cooperative multi-point transmission DL CoMP technology, and the LTE system adopts the same frequency networking technology to improve spectrum utilization, which requires introducing downlink interference control technology between the same frequency cells, DL CoMP. The technology is introduced as a downlink co-channel interference control technology. By coordinating the configuration of time-frequency resources, power resources, and air-space resources of multiple cells, the downlink user of the cell can be resolved in a network with strong downlink interference between the same-frequency cells. Spectrum efficiency and downlink throughput are limited by the problem of interference between adjacent cells, thereby improving the throughput of cell edge users and improving high-speed service coverage.

In terms of implementation, the DL CoMP technology includes four modes, namely, joint transmission JT mode, dynamic node power zero DPB mode, dynamic node selection DPS mode, and cooperative beamforming CBF mode.

FIG. 1(a) is a schematic diagram of transmission in the DPS mode. In the DPS mode, the UE selects a cell with the best signal quality from the CoMP cooperating set to perform Physical Downlink Shared Channel (PDSCH) transmission. The cell that performs PDSCH transmission with the UE may be transformed in each subframe. Figure 1 (b) shows a transmission diagram of the DPB mode. In the DPB mode, when a cell performs data transmission with the UE, other cells in the CoMP cooperation set remain silent to reduce interference of other cells to the UE. FIG. 1(c) shows a transmission diagram of the JT mode. In the JT mode, the UE performs PDSCH transmission with multiple cells (partial cells or all cells of the CoMP cooperating set) to improve the quality of the received signal of the UE. Figure 1 (d) shows the transmission diagram of the CBF mode. In the CBF mode, the data to be transmitted to the UE exists only in one cell in the CoMP cooperating set, and multiple cells in the CoMP cooperation set jointly decide how to schedule and how Beamforming is performed to effectively control interference to the UE within the cooperative area.

The above four modes can be divided into two categories according to the synergistic manner, and the first type is joint processing. (Joint Processing, JP) mode, including JT mode, DPB mode and DPS, and the second type is Coordinated Scheduling (CS) mode, including CBF mode.

The base station performs the CoMP mode scheduling on the UE in the nth subframe. The CoMP mode may be one of the JT mode, the DPB mode, the DPS mode, and the CBF mode. The UE needs to measure and report the CoMP mode corresponding to the nth subframe. The CQI, the base station uses the CQI reported by the UE to perform a modulation and coding scheme (MCS) selection, so that the selected MCS matches the channel of the nth subframe, thereby maximizing the throughput of the user.

A method for determining a channel quality indicator CQI in a coordinated multipoint communication according to an embodiment of the present invention, the base station sends scheduling information to the UE, and the UE measures the instantaneous value of the CQI of the nth subframe according to the indication of the scheduling information, and uses the aperiodic reporting. The method is to report the measured CQI instantaneous value to the base station in the n+th subframe, where the nth subframe is a subframe in which the base station performs CoMP mode scheduling on the UE, and the instantaneous value of the CQI is the UE corresponding to the nth subframe. The COMP mode is measured, and the CQI instantaneous value measured by the UE is consistent with the COMP mode corresponding to the nth subframe. Therefore, the technical solution provided by the embodiment of the present invention can implement the accuracy of the UE in the COMP mode corresponding to the UE in the nth subframe. CQI.

Embodiment 1

As shown in FIG. 2, on the UE side, an embodiment of the present invention provides a method for determining a channel quality indicator CQI in coordinated multipoint communication, including:

S201. The UE receives the scheduling information sent by the base station, where the scheduling information includes first information, where the first information is used to indicate that the UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where n is positive. An integer, K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission of the CoMP mode by the base station;

S202. The UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value to the base station in the n+Kth subframe.

In this embodiment, the UE receives the scheduling of the CoMP mode of the base station in the nth subframe, and the CoMP mode may be one of the JT mode, the DPB mode, the DPS mode, and the CBF mode. The method for the base station to determine the CQI of the nth subframe is as shown in FIG. 2, and mainly includes: the UE receives the tone transmitted by the base station. And the UE measures the CQI instantaneous value in the nth subframe according to the scheduling information, and reports the CQI instantaneous value to the base station in the n+Kth subframe.

The base station may perform different CoMP mode scheduling on the UE in different subframes. In this embodiment, the CQI instantaneous value measured by the UE corresponds to the nth subframe, and the CQI instantaneous value and the CQI instantaneous value of other subframes are mutually independent. The CQI instantaneous value is measured by the UE in the CoMP mode corresponding to the nth subframe UE. Therefore, the technical solution of the embodiment can implement the UE to report the accurate CQI in the COMP mode corresponding to the nth subframe UE. .

In this embodiment, the CQI instantaneous value is reported in a non-periodic reporting manner, that is, the UE reports the CQI instantaneous value of the nth subframe to the base station in the n+Kth subframe. In the existing LTE protocol, the CQI reporting method includes a periodic reporting CQI and a non-periodic reporting CQI. The periodic reporting CQI refers to a fixed physical uplink control channel (Physical Uplink Control CHannel, PUCCH) allocated by the UE when using the network. The resource periodically reports the CQI, and the aperiodic reporting of the CQI means that the UE triggers the aperiodic reporting request in the nth subframe, and reports the CQI in the n+K subframes by using the PUSCH. The CQIs that are not reported in the cyclically reported CQI mode are measured on the subframes, and the CQIs that are not reported in the periodic reporting CQI mode are measured on the subframes that trigger the aperiodic reporting request. The periodically reported CQI is consistent with the COMP mode scheduling performed by the base station to the UE on the subframe in which the CQI is measured. Therefore, in order to achieve that the CQI reported by the UE is consistent with the CoMP mode scheduling performed by the base station in the nth subframe, the CQI is reported in a non-period manner.

In this embodiment, when the UE measures the CQI instantaneous value in the nth subframe, based on the scheduling of the CoMP mode performed by the base station in the nth subframe, the UE measures the useful signal strength and the interference noise signal strength respectively on the measurement bandwidth, where the useful signal The intensity is the average of the plurality of useful signal strengths measured by the UE over the measurement bandwidth, the interference noise signal strength is the average of the plurality of interference noise signal strengths measured by the UE over the measurement bandwidth; the UE calculates the signal to interference plus noise ratio (Signalto Interference plus Noise Ratio (SINR), SINR = useful signal strength / interference noise signal strength; the UE determines the CQI corresponding to the SINR according to the correspondence between the SINR and the CQI, which is the CQI instantaneous value measured by the UE in the nth subframe.

The base station performs different CoMP mode scheduling on the UE in different subframes, and the useful information measured by the UE The signal strength and the interference noise signal strength are different, so the SINR calculated by the UE is different, and the CQI corresponding to the SINR is also different. For example, as shown in FIG. 1( a ), the base station performs DPS mode scheduling on the UE in the nth subframe. When the transmission point (TP) 1 and the UE perform PDSCH transmission, the useful signal strength measured by the UE is S1. The interference noise signal strength is I2+N, and the SQ1=S1/(I2+N) corresponding to the CQI instantaneous value of the nth subframe; when the TP2 and the UE perform PDSCH transmission, the useful signal strength measured by the UE is S2, and the interference noise The signal strength is I1+N, and the CQI instantaneous value of the nth subframe corresponds to SINR2=S2/(I1+N). As shown in FIG. 1(b), the base station performs DPB mode scheduling on the UE in the nth subframe. When TP2 is silent, the useful signal strength measured by the UE is S1, the interference noise signal strength is N, and the CQI of the nth subframe. The instantaneous value corresponds to SINR3=S1/N. As shown in FIG. 1(c), the base station performs scheduling in the JT mode in the nth subframe. When TP1 and TP2 simultaneously send useful signals to the UE, the useful signal strength measured by the UE is S1+S2, and the interference noise signal strength is For N, the CQI instantaneous value of the nth subframe corresponds to SINR4=(S1+S2)/N. Wherein, S1 is a useful signal that the UE receives the TP1, S2 is a useful signal that the UE receives the TP2, I1 is an interference signal that the UE receives the TP1, and I2 is an interference signal that the UE receives the TP2, where N is noise.

In this embodiment, when the UE measures the CQI instantaneous value in the nth subframe, the UE may have the following two modes:

Manner 1: When the scheduling information received by the UE further includes the second information, where the second information is the scheduling bandwidth of the base station performing the CoMP mode scheduling on the UE in the nth subframe, the UE measures the CoMP mode corresponding to the UE in the nth subframe. The instantaneous value of the CQI under the scheduled bandwidth. The scheduling bandwidth is used as a measurement bandwidth when the UE measures the CQI instantaneous value in the nth subframe.

For example, the UE uses a resource block (Resource Block, RB) in the CoMP mode corresponding to the nth subframe as an example, and assumes that the UE measures a useful signal strength and an interference noise signal strength on each RB. 40 useful signal strengths and 40 interfering noise signal intensities are measured, and the average of the useful signal strength and the average of the interfering noise signal strength are calculated respectively, and the average of the useful signal strength is compared with the average of the interfering noise signal strength. The SINR is obtained, and then the CQI corresponding to the SINR is determined, and the CQI is the CQI instantaneous value of the scheduling bandwidth of the CoMP mode corresponding to the UE in the nth subframe. The granularity at which the UE measures the useful signal strength and the interference noise signal strength may also be a subcarrier of the RB.

Optionally, when the scheduling information received by the UE further includes third information, where the third information is used to indicate that the UE performs the beamforming (Beamforming, BF) mode transmission scheduling in the nth subframe, the UE is in the nth sub-sub The frame measurement is based on the CQI instantaneous value of the Demodulation Reference Symbol (DMRS) on the scheduling bandwidth of the BF mode.

Generally, when the CoMP mode scheduled by the base station to the UE is scheduled in the JT mode, the UE performs the BF mode transmission scheduling; when the base station performs the CoMP mode scheduling on the UE for the other three modes except the JT mode, the UE performs the BF. Mode or multi-input multiple output (MIMO) mode transmission scheduling.

When the UE performs transmission scheduling in the BF mode, the subcarriers corresponding to the BF mode include DMRS and Cell Reference Signals (CRS); when the UE performs transmission scheduling in the MIMO mode, the subcarriers corresponding to the BF mode include only the DMRS. If the second information and the third information are included in the scheduling information, the subcarrier position at which the UE measures the instantaneous value of the CQI is in the DMRS.

Manner 2: The UE defaults to the CQI instantaneous value in the n-th subframe measurement system full bandwidth, that is, the system full bandwidth is used as the measurement bandwidth when the UE measures the CQI instantaneous value in the nth subframe.

For example, taking the system full bandwidth as 100 RB as an example, assume that the UE measures a useful signal strength and an interference noise signal strength on each RB, and obtains 100 useful signal strengths and 100 interference noise signal strengths, which are respectively calculated and useful. The average of the signal strength and the average of the interference noise signal strength, and then the average of the useful signal strength and the average of the interference noise signal strength are used to obtain the SINR, thereby determining the CQI corresponding to the SINR, which is the nth measured by the UE. The instantaneous value of the CQI at full bandwidth of the sub-frame system. The granularity at which the UE measures the useful signal strength and the interference noise signal strength may also be a subcarrier of the RB.

Optionally, when the scheduling information received by the UE includes the third information, where the third information is used to indicate that the UE performs the BF mode transmission scheduling in the nth subframe, the UE measures the system based on the BF mode in the nth subframe. The CQI instantaneous value of the bandwidth CRS, that is, the subcarrier position at which the UE measures the CQI instantaneous value lies in the CRS.

In the above two modes, the CQI instantaneous values measured by the UE are all based on the CoMP mode corresponding to the nth subframe UE. Preferably, in the first mode, the UE measures the CoMP mode corresponding to the UE in the nth subframe. The CQI instantaneous value under the scheduling bandwidth is reduced relative to the second mode. The first method reduces the measurement bandwidth range, so that the measured CQI instantaneous value is more accurate, and the measurement overhead is reduced as the measurement bandwidth range is reduced.

In this embodiment, the UE reports the CQI instantaneous value to the base station in a non-periodic reporting manner. After the UE measures the CQI instantaneous value in the nth subframe, the UE does not immediately report the CQI instantaneous value to the base station, but waits for K subframes. That is, the CQI instantaneous value is reported to the base station in the n+Kth subframe. For the frequency division duplex (FDD) system, the value of K is 4, and the value of K in the time division duplex (TDD) system at 0-6 is shown in Table 1.

Table I

In this embodiment, the UE may report the CQI instantaneous value to the base station by using a Channel State information (CSI) request (request) in the Downlink Control Information (DCI) format field. The meaning of the CSI request value in the DCI format field is as follows:

The value of the CSI request is 00, indicating that the UE does not trigger the aperiodic CQI report.

The value of the CSI request is 01, indicating that the UE triggers the aperiodic CQI report only in the scenario of a single serving cell.

The value of the CSI request is 10 or 11, indicating that the UE triggers the aperiodic CQI reporting only in the scenario of multiple serving cells.

To further ensure the accuracy of the CQI measurement, in this embodiment, the meaning of the value of the CSI request for the scenario of the single serving cell in the DCI format field is further defined, as follows:

When the value of the CSI request is 10, the UE triggers the acyclic reporting CQI in the scenario of a single or multiple serving cells. If the scheduling information received by the UE includes the second information, where the second information is the scheduling bandwidth of the CoMP mode scheduled by the base station in the nth subframe, the UE measures the scheduling bandwidth of the CoMP mode corresponding to the UE in the nth subframe. CQI instantaneous value; otherwise, the UE defaults to the CQI instantaneous value at the full bandwidth of the nth subframe measurement system.

When the value of the CSI request is 11, the UE triggers the acyclic reporting CQI in the scenario of a single or multiple serving cells. If the scheduling information received by the UE includes the second information and the third information, the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe, where the third information is used to indicate that the UE is in the nth subframe. The BF mode transmission scheduling is performed, and the UE measures the CQI instantaneous value of the DMRS on the scheduling bandwidth of the BF mode in the nth subframe; otherwise, the UE measures the CQI instantaneous value of the CRS on the entire bandwidth of the system in the nth subframe.

As shown in FIG. 3, corresponding to the UE side, on the base station side, the embodiment of the present invention provides a method for determining a channel quality indicator CQI in coordinated multipoint communication, including:

S301. The base station sends scheduling information to the UE, where the scheduling information includes first information, where the first information is used to indicate that the UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where n is positive. An integer, K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission of the CoMP mode by the base station;

S302. The base station receives the CQI instantaneous value reported by the UE in the n+Kth subframe.

In this embodiment, the scheduling information sent by the base station to the UE may further include the second information and/or the third information, where the second information is a scheduling bandwidth in which the base station performs CoMP mode scheduling on the UE in the nth subframe, and the third information is used. The UE is instructed to perform transmission scheduling of the BF mode in the nth subframe. For the specific operation of the UE after receiving the scheduling information, refer to the embodiment on the UE side, and details are not described herein again.

With reference to the technical solutions shown in FIG. 2 and FIG. 3, a method for determining a channel quality indicator CQI in cooperative multipoint communication according to an embodiment of the present invention is illustrated:

As shown in FIG. 4, the base station performs scheduling in the DPB mode on the UE in subframe #3D (subframe #3D indicates the downlink subframe No. 3, the same applies hereinafter), and the base station sends scheduling information to the UE, where the scheduling information indicates that the UE is in Subframe #3D measures the CQI instantaneous value and reports the CQI instantaneous value to the base station in subframe #7U. The UE performs an operation according to the scheduling information, that is, the UE measures the CQI instantaneous value in subframe #3D, and reports the CQI instantaneous value to the base station in subframe #7U.

In the DPB mode transmission process, the TP1 sends a useful signal to the UE, and the TP2 does not transmit the interference signal, the SINR3=S1/N corresponding to the CQI instantaneous value measured by the UE, and the SINR3 does not participate in the subframes before and after the subframe #3D. The CQI filtering, so the CQI instantaneous value corresponding to the SINR3 measured by the UE is consistent with the CoMP mode corresponding to the UE on the subframe #3D. Optionally, when the base station performs the DPB mode scheduling on the UE in the other subframes (different from the subframe #3D), the base station may use the CQI instantaneous value of the subframe #3D reported by the UE to perform the MCS selection in the other subframes. Therefore, while enhancing the accuracy of the UE to measure CQI, the throughput of the edge user is improved.

As shown in FIG. 5, the base station performs scheduling in the JT mode on the UE in the subframe #3D, and the base station sends scheduling information to the UE, where the scheduling information indicates that the UE measures the CQI instantaneous value in the subframe #3D, and in the subframe #7U direction. The base station reports the CQI instantaneous value. The UE performs an operation according to the scheduling information, that is, the UE measures the CQI instantaneous value in subframe #3D, and reports the CQI instantaneous value to the base station in subframe #7U.

In the JT mode transmission process, both TP1 and TP2 send useful signals to the UE, and the SINR4=(S1+S2)/N corresponding to the CQI instantaneous value measured by the UE, and the SINR4 does not participate in the subframes before and after the subframe #3D. The CQI filtering, so the CQI instantaneous value corresponding to the SINR4 measured by the UE is consistent with the CoMP mode corresponding to the UE on the subframe #3D. Optionally, when the base station performs the JT mode scheduling on the UE in other subframes (different from the subframe #3D), the base station may perform the MCS selection in the other subframes by using the CQI instantaneous value of the subframe #3D reported by the UE. Thereby, the throughput of the edge user is improved while enhancing the accuracy of the UE measuring the CQI.

The method for determining a channel quality indicator CQI in the coordinated multi-point communication provided by the embodiment of the present invention, the base station sends scheduling information to the UE, and the UE measures the instantaneous value of the CQI of the nth subframe according to the indication of the scheduling information, and uses the aperiodic report. The method, that is, the measured CQI instantaneous value is reported to the base station in the n+Kth subframe, and the nth subframe is a subframe in which the base station performs CoMP mode scheduling on the UE, because the CQI The instantaneous value is measured by the UE based on the COMP mode corresponding to the nth subframe, and the CQI instantaneous value measured by the UE is consistent with the COMP mode corresponding to the nth subframe. Therefore, the technical solution provided by the embodiment of the present invention can enable the UE to report to the base station. The accurate CQI in the COMP mode corresponding to the nth subframe UE.

Embodiment 2

Based on the above embodiment, the present invention further provides a UE, and the UE may adopt the method provided by the embodiment corresponding to FIG. 2 . Referring to FIG. 6 , the UE 600 includes: a receiving unit 601, a processing unit 602, and a sending unit 603. .

The receiving unit 601 is configured to receive scheduling information sent by the base station, where the scheduling information includes first information, where the first information is used to indicate that the UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where A positive integer, K is a preset value, and the nth subframe is a subframe in which the base station performs multi-point cooperative transmission of the CoMP mode by the base station;

The processing unit 602 is configured to measure a CQI instantaneous value in the nth subframe according to the scheduling information received by the receiving unit 601.

The sending unit 603 is configured to report, according to the scheduling information received by the receiving unit 601, the CQI instantaneous value measured by the processing unit 602 to the base station in the n+Kth subframe.

Optionally, the scheduling information further includes second information, where the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe;

When the processing unit 602 measures the CQI instantaneous value in the nth subframe, the processing unit 602 is specifically configured to:

Optionally, the scheduling information further includes third information, where the third information is used to indicate that the UE performs a beamforming BF mode transmission scheduling in the nth subframe.

When the processing unit 602 measures the instantaneous value of the CQI under the scheduling bandwidth in the nth subframe, the processing unit 602 is specifically configured to:

Optionally, when the CQI instantaneous value is measured in the nth subframe, the processing unit 602 is specifically configured to:

Optionally, the scheduling information further includes third information, where the third information is used to indicate that the UE is in the nth subframe. Performing a beamforming BF mode transmission scheduling;

The processing unit 602 is specifically configured to: when the CQI instantaneous value of the entire bandwidth of the system is measured in the nth subframe:

Based on the above embodiment, the present invention further provides a base station, which may adopt the method provided by the embodiment corresponding to FIG. 3. Referring to FIG. 7, the base station 700 includes: a processing unit 701, a sending unit 702, and a receiving unit 703. .

The processing unit 701 is configured to determine scheduling information, where the scheduling information includes first information, where the first information is used to indicate that the user equipment UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where n is A positive integer, K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission on the UE to perform CoMP mode scheduling;

The sending unit 702 is configured to send, to the UE, scheduling information determined by the processing unit 701;

The receiving unit 703 is configured to receive a CQI instantaneous value reported by the UE in the n+Kth subframe.

Optionally, the scheduling information further includes second information, where the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe.

Optionally, the scheduling information further includes third information, where the third information is used to indicate that the UE performs the beamforming BF mode transmission scheduling in the nth subframe.

Based on the above embodiment, the present invention further provides a channel quality indicator CQI determining system in coordinated multipoint communication. Referring to FIG. 8, the system 800 includes a UE 801 and a base station 802, where the UE is The illustrated UE is the same device, which is the same device as the base station shown in FIG.

It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner. In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

An integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, can be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

Based on the above embodiment, the present invention further provides a UE, which may adopt the method provided by the embodiment corresponding to FIG. 2, and may be the same device as the UE shown in FIG. 6. Referring to FIG. 9, the UE 900 includes a transceiver 901, a processor 902, a bus 903, and a memory 904, where:

The transceiver 901, the processor 902, and the memory 904 are connected to each other through a bus 903. The bus 903 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. Wait. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 9, but it does not mean that there is only one bus or one type of bus.

The transceiver 901 is configured to receive scheduling information sent by the base station, where the scheduling information includes first information, where the first information is used to indicate that the UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where A positive integer, K is a preset value, and the nth subframe is a subframe in which the base station performs multi-point cooperative transmission of the CoMP mode by the base station;

The processor 902 is configured to measure a CQI instantaneous value in the nth subframe according to the scheduling information received by the transceiver 901.

The transceiver 901 is further configured to report, according to the received scheduling information, the CQI instantaneous value measured by the processor 902 to the base station in the n+Kth subframe.

When the processor 902 measures the CQI instantaneous value in the nth subframe, it is specifically used to:

When the processor 902 measures the instantaneous value of the CQI under the scheduling bandwidth in the nth subframe, the processor 902 is specifically configured to:

Optionally, when the processor 902 measures the CQI instantaneous value in the nth subframe, specifically:

When the processor 902 measures the instantaneous value of the CQI under the full bandwidth of the system in the nth subframe, the processor 902 is specifically configured to:

The UE 900 also includes a memory 904 for storing programs and the like. In particular, the program can include program code, the program code including computer operating instructions. The memory 904 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage. The processor 902 executes the application stored in the memory 904 to implement the CQI determination method in the cooperative multipoint communication as described above.

Based on the above embodiments, the present invention further provides a base station, which may adopt the method provided by the embodiment corresponding to FIG. 3, and may be the same device as the base station shown in FIG. 7. Referring to FIG. 10, the base station 1000 includes a processor 1001, a transceiver 1002, a bus 1003, and a memory 1004, wherein:

The processor 1001, the transceiver 1002, and the memory 1004 are connected to each other through a bus 1003; the bus 1003 may be a PCI bus or an EISA bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 10, but it does not mean that there is only one bus or one type of bus.

The processor 1001 is configured to determine scheduling information, where the scheduling information includes first information, where the first information is used to indicate that the user equipment UE measures the CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value in the n+K subframes, where n is A positive integer, K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission on the UE to perform CoMP mode scheduling;

The transceiver 1002 is configured to send scheduling information determined by the processor 1001 to the UE, and receive a CQI instantaneous value reported by the UE in the n+Kth subframe.

The base station 1000 also includes a memory 1004 for storing programs and the like. In particular, the program can include program code, the program code including computer operating instructions. The memory 1004 may include RAM and may also include non-volatile memory, such as at least one disk storage. The processor 1001 executes the application stored in the memory 1004 to implement the CQI determination method in the cooperative multipoint communication as described above.

In the technical solution provided by the embodiment of the present invention, the base station sends the scheduling information to the UE; the UE measures the instantaneous value of the CQI of the nth subframe according to the indication of the scheduling information, and adopts a non-periodic reporting manner, that is, in the n+Kth subframe. The measured CQI instantaneous value is reported to the base station, where the nth subframe is a subframe in which the base station performs CoMP mode scheduling on the UE, and the CQI instantaneous value is measured by the UE based on the COMP mode corresponding to the nth subframe, and the CQI measured by the UE The instantaneous value is consistent with the COMP mode corresponding to the nth subframe. Therefore, the technical solution provided by the embodiment of the present invention can enable the UE to report the accurate CQI in the COMP mode corresponding to the nth subframe UE to the base station.

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

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

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

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

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

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

Claims

A method for determining a channel quality indicator CQI in cooperative multipoint communication, comprising:

The user equipment UE receives scheduling information sent by the base station, where the scheduling information includes first information, where the first information is used to indicate that the UE measures CQI instantaneous value in the nth subframe, and reports in the n+K subframes. The CQI instantaneous value, the n is a positive integer, the K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission CoMP mode scheduling on the UE;

The UE measures a CQI instantaneous value in the nth subframe, and reports the CQI instantaneous value to the base station in the n+Kth subframe.
The method according to claim 1, wherein the scheduling information further comprises second information, wherein the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe. ;

The UE measures a CQI instantaneous value in the nth subframe, including:

The UE measures a CQI instantaneous value under the scheduling bandwidth in the nth subframe.
The method of claim 2, wherein the scheduling information further comprises third information, the third information is used to indicate that the UE performs beamforming BF mode transmission scheduling in the nth subframe. ;

And measuring, by the UE, the CQI instantaneous value in the scheduling bandwidth in the nth subframe, including:

The UE demodulates a CQI instantaneous value of the reference signal DMRS on the scheduling bandwidth based on the BF mode in the nth subframe measurement.
The method according to claim 1, wherein the UE measures CQI instantaneous values in the nth subframe, including:

The UE measures the CQI instantaneous value at the full bandwidth of the system in the nth subframe.
The method of claim 4, wherein the scheduling information further comprises third information, the third information is used to indicate that the UE performs a beamforming BF mode transmission scheduling in the nth subframe. ;

The CQI instantaneous value of the UE in the entire bandwidth of the nth subframe measurement system includes:

The UE measures a CQI instantaneous value of the cell reference signal CRS on the full bandwidth of the system based on the BF mode in the nth subframe.
A method for determining a channel quality indicator CQI in cooperative multipoint communication, comprising:

The base station sends the scheduling information to the user equipment UE, where the scheduling information includes the first information, where the first information is used to indicate that the UE measures the CQI instantaneous value in the nth subframe, and reports the CQI in the n+K subframes. The instantaneous value, the n is a positive integer, the K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission CoMP mode scheduling on the UE;

The base station receives a CQI instantaneous value reported by the UE in the n+Kth subframe.
The method according to claim 6, wherein the scheduling information further includes second information, where the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe. .
The method according to claim 6 or 7, wherein the scheduling information further comprises third information, wherein the third information is used to indicate that the UE performs beamforming BF mode in the nth subframe. Transmission scheduling.
A user equipment (UE), comprising:

a receiving unit, configured to receive scheduling information sent by the base station, where the scheduling information includes first information, where the first information is used to indicate that the UE measures a CQI instantaneous value in the nth subframe, and is in the n+Kth subframe The CQI instantaneous value is reported by the frame, where n is a positive integer, and the K is a preset value, where the nth subframe is a subframe in which the base station performs coordinated multi-point transmission CoMP mode scheduling on the UE;

a processing unit, configured to measure a CQI instantaneous value in the nth subframe according to the scheduling information received by the receiving unit;

And a sending unit, configured to report the CQI instantaneous value measured by the processing unit to the base station in the n+Kth subframe according to the scheduling information received by the receiving unit.
The UE according to claim 9, wherein the scheduling information further includes second information, where the second information is a scheduling bandwidth of the base station performing CoMP mode scheduling on the UE in the nth subframe. ;

The processing unit is specifically configured to:

The CQI instantaneous value at the scheduled bandwidth is measured in the nth subframe.
The UE according to claim 10, wherein the scheduling information further includes third information, where the third information is used to indicate that the UE performs beamforming BF mode transmission scheduling in the nth subframe. ;

When the processing unit measures the CQI instantaneous value in the scheduling bandwidth in the nth subframe, the processing unit is specifically configured to:

Demodulating a CQI instantaneous value of the reference signal DMRS on the scheduling bandwidth based on the BF mode in the nth subframe measurement.
The UE according to claim 9, wherein the processing unit is specifically configured to:

The CQI instantaneous value is measured at the full bandwidth of the nth subframe.
The UE according to claim 12, wherein the scheduling information further includes third information, where the third information is used to indicate that the UE performs beamforming BF mode transmission scheduling in the nth subframe. ;

The processing unit is configured to: when the CQI instantaneous value of the entire bandwidth of the system is measured in the nth subframe;

The CQI instantaneous value of the cell reference signal CRS on the full bandwidth of the system based on the BF mode is measured in the nth subframe.
A base station, comprising:

a processing unit, configured to determine scheduling information, where the scheduling information includes first information, where the first information is used to indicate that the user equipment UE measures the CQI instantaneous value in the nth subframe, and reports the CQI in the n+K subframes. The instantaneous value, the n is a positive integer, the K is a preset value, and the nth subframe is a subframe in which the base station performs coordinated multi-point transmission CoMP mode scheduling on the UE;

a sending unit, configured to send, to the UE, the scheduling information that is determined by the processing unit;

And a receiving unit, configured to receive a CQI instantaneous value reported by the UE in the n+Kth subframe.
The base station according to claim 14, wherein the scheduling information further comprises second information, wherein the second information is that the base station performs a CoMP mode on the UE in the nth subframe. Scheduled scheduling bandwidth.
The base station according to claim 14 or 15, wherein the scheduling information further includes third information, where the third information is used to indicate that the UE performs beamforming BF mode in the nth subframe. Transmission scheduling.
A channel quality indicator CQI determining system for cooperative multipoint communication, comprising a user equipment UE and a base station, characterized in that:

The UE includes the UE according to any one of claims 9 to 13;

The base station comprises a base station according to any of claims 14 to 16.