CN101841356A - Method, device and system for feeding back channel quality information - Google Patents
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Abstract
The invention discloses a method for feeding back channel quality information, which comprises the following steps of: firstly, determining a report collection of the channel quality information, and calculating comprehensive channel quality information of a plurality of cells according to channel state information of each cell in the collection; secondly, performing difference calculation on the comprehensive channel quality information of the plurality of cells; and finally, performing quantification on the comprehensive channel quality information of the plurality of cells after the difference calculation, and feeding the comprehensive channel quality information of the plurality of cells after the quantification back to a network side. So, in an LTE-A system adopting a joint transmission scheme, the network side can acquire accurate channel quality information of each cell to ensure that reasonable user scheduling, resource allocation and MCS selection can be performed according to the channel quality information of the plurality of cells, the throughput of the joint treatment of the plurality of cells can be further improved, and the system performance is promoted. The invention simultaneously discloses a communication device and a communication system.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method, an apparatus, and a system for feeding back channel quality information.
Background
The International Telecommunications Union (ITU) has proposed very harsh requirements for the performance of the IMT-Advanced system of the next-generation mobile communication system, for example, the maximum system transmission bandwidth needs to reach 100MHz, and the peak rates of uplink and downlink data transmission need to reach 500Mbps and 1Gbps respectively; and places very high demands on the average spectral efficiency of the system, especially on the edge spectral efficiency, for example, for 2-transmit-2-receive systems, the average spectral efficiency is required to be > 2.4bps/Hz, and the cell edge spectral efficiency is required to be > 0.07 bps/Hz/user.
In order to meet the performance requirement of the IMT-Advanced system, 3GPP provides a method for improving the system performance by adopting a multi-point cooperative transmission technology in a Long Term Evolution (LTE-A) system of a next generation mobile cellular communication system. The multipoint cooperative transmission technology is to improve the quality of signals received by users and reduce the interference between cells through the joint scheduling or cooperative transmission of a plurality of cells separated in geographical positions, thereby effectively improving the system capacity and the spectrum use efficiency of edge users.
The scheme adopting the multipoint cooperative transmission technology is mainly divided into two types: the joint scheduling scheme and the joint transmission scheme are described in detail below.
The joint scheduling scheme refers to allocating mutually orthogonal resources for different UEs through coordination of time, frequency and space resources among cell base stations, so as to avoid interference among cells. The inter-cell interference is a main factor restricting the performance of the cell edge UE, so that the inter-cell interference can be reduced by the joint scheduling, and the performance of the cell edge UE is improved. For example, referring to fig. 1, the base stations in cell 1, cell 2, and cell 3 respectively transmit data to the UEs belonging to the cell, and in this process, the base stations in cell 1, cell 2, and cell 3 schedule three UEs that may interfere with each other on mutually orthogonal resources through mutual joint scheduling, so as to effectively avoid interference between cells.
Unlike a joint scheduling scheme in which only a base station in one cell transmits data to a UE, in the joint transmission scheme, base stations in multiple cells may transmit data to the UE at the same time to enhance the quality of signals received by the UE. For example, referring to fig. 2, base stations in cell 1, cell 2, and cell 3 transmit data to one UE on the same resource, and the UE receives data from multiple cells at the same time, and if the base stations in all cells transmit the same data to the UE, the UE superimposes useful signals from the multiple cells, so that the quality of its received signal can be improved, and the system performance is improved.
In the existing LTE system, the UE needs to periodically receive a common pilot signal from a common pilot port of a cell to evaluate the channel quality from a base station in the cell to the UE, and feed back calculated channel quality indication information (CQI) to the network side, and the CQI may also include a Precoding Matrix Index (PMI) and a data stream number (RI). According to different calculation modes, CQI fed back by the UE is divided into a broadband CQI and a sub-band CQI; the wideband CQI is a composite indicator of channel quality over all frequency bands of the system, and the sub-band CQI is a composite indicator of channel quality over a segment of the frequency band (frequency band of a set range) of the system. According to the CQI fed back by the UE, the base station may perform operations such as reasonable user scheduling, resource allocation, Modulation and Coding Scheme (MCS) selection, and the like for the UE, thereby improving the spectrum utilization rate.
In an LTE-A system, when a joint sending scheme is adopted, more than one cell for transmitting data to UE is adopted, so that CQI required to be fed back by the UE not only needs to reflect the channel quality of the cell to which the UE belongs currently, but also needs to reflect the channel quality of other cooperative cells; in addition, the relative strength of the channel quality between the cooperative cells changes due to the change of the radio propagation environment and the UE movement, and the CQI fed back by the UE must reflect the change. However, in the existing LTE system, the UE only feeds back the CQI of the current home cell, and there is no suitable technical scheme for enabling the UE to simultaneously feed back the CQIs of the current home cell and the cooperative cell, and obviously, the CQI feedback method in the LTE system cannot meet the requirements of user scheduling, resource allocation, and MCS selection in the joint transmission scheme in the LTE-a system, and prevents the implementation of the joint transmission scheme in the LTE-a system.
Disclosure of Invention
The embodiment of the application provides a method, a device and a system for feeding back channel quality information, so that an LTE-A system adopting a joint transmission scheme can obtain accurate channel quality information of each cell in the system.
The embodiment of the application provides the following specific technical scheme:
a feedback method of channel quality information, wherein a plurality of cells adopt a joint transmission mode to transmit data to a mobile station (UE), the method comprises:
determining a channel quality information reporting set, and calculating multi-cell comprehensive channel quality information according to the channel state information of each cell in the set;
carrying out differential calculation on the multi-cell comprehensive channel quality information;
and quantizing the multi-cell comprehensive channel quality information subjected to differential calculation.
A communication apparatus to which a plurality of cells transmit data in a joint transmission scheme, comprising:
a determining unit, configured to determine a channel quality information reporting set;
a measurement unit configured to measure channel state information of each cell in the set;
a first arithmetic unit, which is used for calculating the multi-cell comprehensive channel quality information according to the channel state information of each cell;
the second arithmetic unit is used for carrying out differential calculation on the multi-cell comprehensive channel quality information;
and the quantization feedback unit is used for quantizing the multi-cell comprehensive channel quality information subjected to the differential calculation and feeding back the quantized multi-cell comprehensive channel quality information to the network side.
A communication system in which a plurality of cells transmit data to a mobile station UE by a joint transmission scheme, comprising:
the UE is used for determining a channel quality information reporting set, calculating multi-cell comprehensive channel quality information according to the channel state information of each cell in the set, and carrying out differential calculation on the multi-cell comprehensive channel quality information; quantizing the multi-cell comprehensive channel quality information subjected to differential calculation, and feeding back the quantized multi-cell comprehensive channel quality information to a network side;
and the base station is used for receiving the quantized multi-cell comprehensive channel quality information fed back by the UE and carrying out user scheduling and resource allocation on the UE according to the multi-cell comprehensive channel quality information.
In the embodiment of the invention, UE determines a channel quality information reporting set and calculates the multi-cell comprehensive channel quality information according to the channel state information of each cell in the set; then, carrying out differential calculation on the multi-cell comprehensive channel quality information; and finally, quantizing the multi-cell comprehensive channel quality information subjected to differential calculation, and feeding back the quantized multi-cell comprehensive channel quality information to a network side. Therefore, in the LTE-A system adopting the joint transmission scheme, the network side can obtain accurate channel quality information of each cell, so that reasonable user scheduling, resource allocation and MCS selection can be carried out according to the channel quality information of the cells, the throughput of multi-cell joint processing can be improved, and the system performance is improved.
Drawings
FIG. 1 is a diagram illustrating a joint scheduling scheme according to the prior art;
FIG. 2 is a diagram illustrating a joint transmission scheme according to the prior art;
FIG. 3 is a block diagram of a communication system architecture according to an embodiment of the present application;
fig. 4 is a functional structure diagram of a base station in the embodiment of the present application;
fig. 5 is a flow chart of UE feeding back CQI in the embodiment of the present application.
Detailed Description
In the LTE-a system, in order to meet the technical requirements of implementing the joint transmission scheme, the network side can obtain accurate channel quality information of each cell. In the embodiment of the application, the UE determines a channel quality information reporting set and calculates the multi-cell comprehensive channel quality information according to the channel state information of each cell in the set; then, carrying out differential calculation on the multi-cell comprehensive channel quality information; and finally, quantizing the multi-cell comprehensive channel quality information subjected to differential calculation, and feeding back the quantized multi-cell comprehensive channel quality information to a network side. In this embodiment, the differential coding method is adopted to reduce the amount of feedback information and improve the system efficiency.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 3, in the present embodiment, the communication system includes a plurality of UEs 10 and a plurality of base stations 11, wherein,
the UE10 is used for determining a channel quality information reporting set, calculating multi-cell comprehensive channel quality information according to the channel state information of each cell in the set, and performing differential calculation on the multi-cell comprehensive channel quality information; quantizing the multi-cell comprehensive channel quality information subjected to differential calculation, and feeding back the quantized multi-cell comprehensive channel quality information to a network side;
and the base station 11 is configured to receive quantized multi-cell integrated channel quality information fed back by the UE, and perform user scheduling and resource allocation on the UE according to the multi-cell integrated channel quality information.
Referring to fig. 4, in the present embodiment, the UE10 includes a determination unit 100, a measurement unit 101, a first operation unit 102, a second operation unit 103, and a quantization feedback unit 104, wherein,
a determining unit 100, configured to determine a channel quality information reporting set;
a measuring unit 101, configured to measure channel state information of each cell in the set;
a first arithmetic unit 102, configured to calculate multi-cell integrated channel quality information according to the channel state information of each cell;
a second arithmetic unit 103, configured to perform differential calculation on the multi-cell integrated channel quality information;
and the quantization feedback unit 104 is configured to quantize the multi-cell integrated channel quality information subjected to the difference calculation, and feed back the quantized multi-cell integrated channel quality information to the network side.
Based on the above system architecture, in this embodiment, a UE10 and N base stations 11 are taken as an example for explanation, and it is set that each base station 11 of the N base stations 11 participating in joint transmission corresponds to a serving cell (hereinafter, referred to as a cell), and the N cells are referred to as a cell 1 and a cell 2. Then, referring to fig. 5, in this embodiment, the detailed flow of the UE10 feeding back the CQIs of the cells participating in the joint transmission is as follows:
step 500: a channel quality information reporting set, hereinafter referred to as a collective C, is determined, where the collective C includes both a cell to which the UE10 currently belongs and other coordinated cells.
In this embodiment, the methods adopted by the UE10 when determining the set C include, but are not limited to, the following two methods:
1. the UE10 measures the strength of the pilot signal of each surrounding cell, detects the delay of the downlink signal (e.g., synchronization signal, downlink traffic signal) of each cell and feeds back the delay to the network side, and the network side finally determines the set C according to the average value of the strength of the pilot signal of each cell in a set time period or/and the delay of the synchronization signal of each cell, and notifies the UE10 of the cells included in the set C.
2. The UE10 finally determines the set C according to the average value of the pilot signal strength of each cell in a set time period or/and the time delay of the synchronization signal of each cell, and notifies the network side of the cells included in the set C.
In the above methods 1 and 2, when the set C is finally determined according to the average value of the pilot signal strength of each cell in the set time period or/and the time delay of the synchronization signal of each cell, the following limiting conditions may be adopted: for example, the pilot signal strength of each cell differs by < 3dB from the pilot signal strength of the home cell of the UE10, or/and the downlink signal delay difference by < 2us)
In practical application, the set C is a slowly changing set, which is updated according to a certain period,
step 510: and respectively calculating the channel state information from each cell to the UE10 according to the common pilot signal of each cell in the set C.
Step 520: the multi-cell integrated channel quality information is calculated according to the channel state information from each cell to the UE10, which is denoted as CQI (1).
In practical applications, when the UE10 calculates the CQI (1), the.
The first calculation method is as follows: let CQI (1) and CQI (n) denote channel quality information when each cell in the set C transmits independently. For example, UE10 first assumes that only cell 1 transmits data to UE10, and calculates the CQI for cell 1 according to equation 1, denoted as CQI (1); next, the UE10 assumes that only cell 2 transmits data to the UE10, and calculates the CQI of cell 2 according to formula 1, which is denoted as CQI (2); .... analogize so, finally, UE10 assumes that only cell N sends data to UE10, and calculates CQI of cell N according to formula 1, which is denoted as CQI (N); wherein,
equation 1 is:
h (k) is the channel matrix for cell k (1. ltoreq. k. ltoreq.N) to UE10, I0 is interference from other cells, N0 is noise; equation 1 is merely an example.
The second calculation method is as follows: (ii) a CQI (1), the. For example, UE10 first assumes that only cell 1 transmits data to UE10 and calculates CQI (1) according to equation 1; next, the UE10 assumes that cell 1 and cell 2 simultaneously transmit data to the UE10, and calculates the joint CQI of cell 1 and cell 2 according to formula 2, denoted as CQI (2); .... and so on, finally, the UE10 assumes that cell 1 and cell 2.. the cell N simultaneously send data to the UE10, and calculates the joint CQI of the cell 1 and cell 2.. the cell N according to formula 2, which is denoted as CQI (N); wherein,
equation 2 is:
h (1), H (2),..... H (k) is the channel matrix for cell 1, cell 2,......... cell k (1 < k ≦ N) to UE10, respectively, I0 is interference from other cells, N0 is noise; equation 2 is by way of example only.
Step 530: and performing differential calculation on the multi-cell comprehensive channel quality information CQI (1) obtained in the step 320 to obtain CQI' (1) and CQI (N).
In practical applications, when the UE10 performs differential calculation on the CQIs (1).
The first method comprises the following steps: CQI '(1) and CQI' (N) are calculated using formula 3 or formula 4, with cell 1 as a reference point, wherein,
equation 3 is: CQI' (1) ═ CQI (1)
CQI’(2)＝CQI(2)-CQI(1)
CQI’(3)＝CQI(3)-CQI(2)
…
CQI’(N)＝CQI(N)-CQI(N-1)
Equation 4 is: CQI' (1) ═ CQI (1)
CQI’(2)＝CQI(2)-Quant(CQI(1))
CQI’(3)＝CQI(3)-Quant(CQI(2))
…
CQI’(N)＝CQI(N)-Quant(CQI(N-1))
Where Quant () is a quantization function;
the second method is as follows: the CQI '(1) · CQI' (N) is calculated by using the formula 5 or the formula 6 with the cell m (1 ≦ m ≦ N) as a reference point, and the selection of the reference point m may be determined by the network side and then notified to the UE10, or may be determined by the UE10 and then notified to the network side, which is not described herein again,
equation 5 is: CQI' (1) ═ CQI (1) -CQI (m)
CQI’(2)＝CQI(2)-CQI(m)
CQI’(m-1)＝CQI(m-1)-CQI(m)
CQI’(m)＝CQI(m)
CQI’(m+1)＝CQI(m+1)-CQI(m)
…
CQI’(N)＝CQI(N)-CQI(m)
Equation 6 is: CQI' (1) ═ CQI (1) -Quant (CQI (m))
CQI’(2)＝CQI(2)-Quant(CQI(m))
…
CQI’(m-1)＝CQI(m-1)-Quant(CQI(m))
CQI’(m)＝CQI(m)
CQI’(m+1)＝CQI(m+1)-Quant(CQI(m))
…
CQI’(N)＝CQI(N)-Quant(CQI(m))
Wherein Quant () is a quantization function;
step 540: quantizing the multi-cell channel quality information CQI '(1) and CQI' (N) obtained after the difference calculation by using formula 7, wherein the formula 7 is as follows: QCQI '(k) Quant (CQI' (k)), k 1.
In practical applications, preferably, CQI ' (1) or CQI ' (m) obtained by performing differential calculation on CQI (1) or CQI (m) serving as a reference point can be quantized by using set L-bit data, while the remaining CQI ' () is quantized by using Q-bit data, usually setting Q < L, and quantizing parameters serving as reference points by using longer L-bit data, so as to obtain a more accurate quantization result.
Step 550: the quantized multi-cell integrated channel quality information QCQI '(1) ·..... QCQI' (N) is fed back to the network side, and the network side may be received by the base station 11, or may be received by the base station controller, or may be received by other network elements having corresponding management functions, which is not described herein again.
Based on the above embodiment, after receiving the quantized multi-cell integrated channel quality information QCQI '(1), (1....... QCqi' (N) fed back by the UE10, the base station 11 in each cell on the network side may perform inverse differential calculation on the QCQI '(1), (1..... QCqi' (N) according to formula 8 or formula 9 to obtain the estimated values ECQI (1), (1......... ECQI (N)) of the multi-cell channel quality,
equation 8 is: ECQI (1) ═ QCQI' (1)
ECQI(2)＝QCQI’(2)+ECQI(1)
ECQI(3)＝QCQI’(3)+ECQI(2)
…
ECQI(N)＝QCQI’(N)+ECQI(N-1)
Equation 9 is: ecqi (m) QCQI' (m)
ECQI(1)＝QCQI’(1)+ECQI(m)
ECQI(2)＝QCQI’(2)+ECQI(m)
…
ECQI(m-1)＝QCQI’(m-1)+ECQI(m)
ECQI(m+1)＝QCQI’(m+1)+ECQI(m)
…
ECQI(N)＝QCQI’(N)+ECQI(m)
If the UE10 obtains the CQIs (1) and the...... CQI (N) according to the first calculation method in step 520, the ECQIs (1) and the..... ECQIs (N) recovered by the base station 11 on the network side respectively represent the individual information quality information of each cell included in the set C, and if the UE10 obtains the CQIs (1) and the...... CQI (N) according to the second calculation method in step 520, the ECQIs (1) and the...... ECQIs (N) recovered by the base station 11 on the network side respectively represent the channel quality information of the cell 1, the channel quality information of the combination of the cell 1 and the cell 2, and the channel quality information of the combination of the … … … … cell 1 and the cell 2.
In step 520 of the above embodiment, if the UE10 employs closed-loop precoding, the UE10 needs to calculate a precoding matrix and determine an index value (PMI) of the precoding matrix in a codebook before calculating the CQI (1), (1......... CQI (N)), and then calculate the CQI (1), (1...... CQI (N)), and if the UE10 performs precoding by using the calculated precoding matrix when feeding back the quantized QCQI '(1), (1........ QCqi' (N), the UE10 needs to feed back the QCQI '(1), (1...... QCqi' (N) and the obtained PMI to the network side together.
On the other hand, if the UE10 uses beamforming to transmit data, the data actually transmitted by the UE10 is weighted, which causes the snr of the network side demodulation to be different from the snr calculated based on the common pilot; to avoid this, the CQI (n) calculated by the UE10 in step 520 indicates the channel quality information when each cell in the set C performs transmission alone, or indicates the channel quality information when each cell in the set C performs joint transmission in a set manner; the network side needs to recover the ecqi (k) included in the set C when each cell is transmitted individually according to the QCQI '(1),....... QCQI' (N) finally fed back by the UE10, and then compensate the recovered ecqi (k) according to the beamforming gain of each cell, so as to obtain the actual value of the channel quality information when each cell is transmitted individually and the actual value of the channel quality information when each cell is jointly transmitted according to a set manner.
To sum up, in the embodiment of the present application, the UE determines a channel quality information reporting set, and calculates multi-cell integrated channel quality information according to channel state information of each cell in the set; then, carrying out differential calculation on the multi-cell comprehensive channel quality information; and finally, quantizing the multi-cell comprehensive channel quality information subjected to differential calculation, and feeding back the quantized multi-cell comprehensive channel quality information to a network side. Therefore, in the LTE-A system adopting the joint transmission scheme, the network side can obtain accurate channel quality information of each cell, so that reasonable user scheduling, resource allocation and MCS selection can be carried out according to the channel quality information of the cells, the throughput of multi-cell joint processing can be improved, and the system performance is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments herein without departing from the spirit and scope of the application. Thus, if such modifications and variations in the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the embodiments of the present application are intended to include such modifications and variations.
Claims (16)
1. A method for feeding back channel quality information, comprising:
determining a channel quality information reporting set, and calculating multi-cell comprehensive channel quality information according to the channel state information of each cell in the set;
carrying out differential calculation on the multi-cell comprehensive channel quality information;
quantizing the multi-cell comprehensive channel quality information subjected to differential calculation;
and feeding back the quantized multi-cell comprehensive channel quality information to a network side.
2. The method of claim 1, wherein prior to determining the reporting set of channel quality information, comprising:
measuring the pilot signal intensity of each cell and the time delay of the downlink signal of each cell to obtain a measurement result;
and locally obtaining the channel quality reporting set according to the measurement result, or feeding the measurement result back to a network side, and receiving a processing result returned by the network side after the network side obtains the channel quality reporting set according to the measurement result.
3. The method of claim 2, wherein obtaining a reporting set of channel qualities based on the measurement results comprises: and comparing the average value of the pilot signal intensity of each cell in a set time period or/and the time delay of the downlink signal of each cell with a preset condition, and attributing the cells meeting the preset condition to the set.
4. The method of claim 1, wherein the multi-cell integrated channel quality information represents channel quality information for individual transmissions by each cell in the set; or, the channel quality information indicates that the cells in the set perform joint transmission according to a set mode.
5. The method of claim 4, wherein if the multi-cell integrated channel quality information is expressed as CQI (1),.. CQI (N), then when the CQI (1),.. CQI (N) is differentially calculated, the equations CQI '(1) CQI (1), CQI' (2) CQI (2) -CQI (1),.. CQI '(N) CQI (N) -CQI (N-1) are used, or the equations CQI' (1) CQI (1), CQI '(2) CQI (2) -Quant (CQI (1), and.. CQI' (N) CQI (N) -Quant (CQI (N-1)) are used, wherein Quant () is a quantization function.
6. The method according to claim 4, wherein if the multi-cell integrated channel quality information is expressed as CQI (1),... CQI (N)), then when the differential calculation is performed on the CQI (1),... CQI (m-1) -CQI (m), i.e. CQI (m-1) -CQI (m), CQI ' (m) -CQI (m), CQI ' (m +1) -CQI (m), CQI ' (N) -CQI (m), or alternatively, when the differential calculation is performed on the CQI (1),... CQI (m +1) -CQI (m), CQI (N) -CQI (m-1) -CQI (m), or CQI (1) -CQI (m), CQI (m +1) -Quant (m), CQI (m-1) -Quant (m), CQI (m-1) -Quant (m), and CQI (m-1) -Quant (m), CQI (m) (m-1), and CQI (m-1) CQI (m +1) CQI (m) and quantum (m) are used, CQI (m) for the differential calculation, CQI' (N) ═ CQI (N) -Quant (CQI (m)), Quant () is a quantization function; wherein m is a selected reference point, and m is more than or equal to 1 and less than or equal to N.
7. The method according to any of claims 1-6, wherein after receiving the feedback quantized multi-cell integrated channel quality information, the network side performs inverse differential calculation to obtain an estimated value of the multi-cell integrated channel quality information.
8. The method as claimed in claim 7, wherein if the beamforming technique is used to transmit data, after obtaining the estimated value of the multi-cell integrated channel quality information, the network side obtains the estimated value of the channel quality information when each cell included in the set is transmitted separately according to the estimated value of the multi-cell integrated channel quality information, and compensates the estimated value of the channel quality information when each cell is transmitted separately according to the beamforming gain of each cell, so as to obtain the actual value of the channel quality information when each cell included in the set is transmitted separately, and obtain the actual value of the integrated channel quality information when each cell is jointly transmitted according to the set manner.
9. A communication apparatus, characterized in that the communication apparatus comprises:
a determining unit, configured to determine a channel quality information reporting set;
a measurement unit configured to measure channel state information of each cell in the set;
a first arithmetic unit, which is used for calculating the multi-cell comprehensive channel quality information according to the channel state information of each cell;
the second arithmetic unit is used for carrying out differential calculation on the multi-cell comprehensive channel quality information;
and the quantization feedback unit is used for quantizing the multi-cell comprehensive channel quality information subjected to the differential calculation and feeding back the quantized multi-cell comprehensive channel quality information to the network side.
10. The communication apparatus according to claim 9, wherein the determining unit measures the pilot signal strength of each cell and the time delay of the downlink signal of each cell before determining the channel quality information reporting set, to obtain a measurement result; and locally obtaining the channel quality reporting set according to the measurement result, or feeding the measurement result back to a network side, and receiving a processing result returned by the network side after the network side obtains the channel quality reporting set according to the measurement result.
11. The communications apparatus as claimed in claim 9, wherein when the determining unit obtains the channel quality reporting set according to the measurement result, the determining unit compares an average value of pilot signal strengths of the cells in a set time period or/and a time delay of downlink signals of the cells with a preset condition, and assigns the cells meeting the preset condition to the set.
12. A communication system, comprising:
the UE is used for determining a channel quality information reporting set, calculating multi-cell comprehensive channel quality information according to the channel state information of each cell in the set, and carrying out differential calculation on the multi-cell comprehensive channel quality information; quantizing the multi-cell comprehensive channel quality information subjected to differential calculation, and feeding back the quantized multi-cell comprehensive channel quality information to a network side;
and the base station is used for receiving the quantized multi-cell comprehensive channel quality information fed back by the UE and carrying out user scheduling and resource allocation on the UE according to the multi-cell comprehensive channel quality information.
13. The communication system of claim 12, wherein before the UE determines the channel quality information reporting set, the UE measures the pilot signal strength of each cell and the time delay of the downlink signal of each cell to obtain a measurement result; and locally obtaining the channel quality reporting set according to the measurement result, or feeding the measurement result back to the base station, and receiving a processing result returned by the base station after the base station obtains the channel quality reporting set according to the measurement result.
14. The communication system of claim 13, wherein the UE or the base station obtaining the reported set of channel qualities according to the measurement results comprises: and comparing the average value of the pilot signal intensity of each cell in a set time period or/and the time delay of the downlink signal of each cell with a preset condition, and attributing the cells meeting the preset condition to the set.
15. The communication system according to claim 12, 13 or 14, wherein after receiving the feedback quantized multi-cell integrated channel quality information, the base station performs inverse difference calculation on the multi-cell integrated channel quality information to obtain an estimated value of the multi-cell integrated channel quality information before performing user scheduling and resource allocation.
16. The communication system according to claim 15, wherein if the UE transmits data by using beamforming technology, the base station network side obtains an estimated value of the multi-cell integrated channel quality information, then obtains an estimated value of the channel quality information when each cell included in the set is transmitted separately according to the estimated value of the multi-cell integrated channel quality information, and compensates the estimated value of the channel quality information when each cell is transmitted separately according to the beamforming gain of each cell, so as to obtain an actual value of the channel quality information when each cell included in the set is transmitted separately, and obtain an actual value of the integrated channel quality information when each cell is jointly transmitted according to a set manner.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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