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System and method for determining channel quality index cqi in coordinated multipoint communication

A technology of channel quality index and determination method, applied in diversity/multi-antenna system, transmission system, digital transmission system, etc., can solve the problems of measuring CQI, increasing pilot signal overhead, and large downlink pilot signal overhead, etc.

Active Publication Date: 2019-11-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these four DL CoMP modes, the existing R8 / R9 / R10 user equipment (User Equipment, UE) is based on the cell-specific reference signal (CRS) or channel state information measurement reference signal (ChannelState Information Reference Signal) , CSI-RS) for channel quality indicator (Channel Quality Indicator, CQI) measurement, because 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
The 3rd Generation Partnership Project (3GPP) R11 protocol proposes a transmission mode TM10, which enhances the DL CoMP in several modes by adding multiple sets of channel state information (ChannelState information, CSI) measurement configurations. CQI measurement, although the CQI under partial DL CoMP can be measured through this transmission mode, it will greatly increase the overhead of the pilot signal
[0004] To sum up, since the existing R8 / R9 / R10 UEs cannot accurately measure the CQI in the CoMP mode corresponding to the UE, the existing R11 / R12 UEs can measure the CQI under partial DL CoMP, but the added downlink pilot signal The overhead is too large, so the UE cannot report accurate CQI to the base station without increasing the downlink pilot signal overhead

Method used

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  • System and method for determining channel quality index cqi in coordinated multipoint communication
  • System and method for determining channel quality index cqi in coordinated multipoint communication
  • System and method for determining channel quality index cqi in coordinated multipoint communication

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Embodiment 1

[0080] like figure 2 As shown, on the UE side, the embodiment of the present invention provides a method for determining the channel quality indicator CQI in coordinated multi-point communication, including:

[0081] S201. The UE receives the scheduling information sent by the base station. The scheduling information includes first information, and the first information is used to instruct the UE to measure the instantaneous CQI value in the n subframe and report the instantaneous CQI value in the n+K subframe, where n is positive An integer, K is a preset value, and the nth subframe is the subframe where the base station performs CoMP mode scheduling for the UE;

[0082] S202. The UE measures the instantaneous CQI value in the nth subframe, and reports the instantaneous CQI value to the base station in the n+Kth subframe.

[0083]In this embodiment, the UE accepts the scheduling of the CoMP mode of the base station on the nth subframe, and the CoMP mode may be one of JT mode...

Embodiment 2

[0119] Based on the above embodiments, the present invention also provides a UE, which can adopt figure 2 For the method provided by the corresponding embodiment, refer to Image 6 As shown, the UE 600 includes: a receiving unit 601 , a processing unit 602 and a sending unit 603 .

[0120] The receiving unit 601 is configured to receive scheduling information sent by the base station, the scheduling information includes first information, and the first information is used to instruct the UE to measure the CQI instantaneous value in the nth subframe and report the CQI instantaneous value in the n+Kth subframe, n is a positive integer, K is a preset value, and the nth subframe is the subframe where the base station performs CoMP mode scheduling for the UE;

[0121] The processing unit 602 is configured to measure the CQI instantaneous value in the nth subframe according to the scheduling information received by the receiving unit 601;

[0122] The sending unit 603 is configure...

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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

technical field [0001] The present invention relates to the communication field, in particular to a system and method for determining channel quality index CQI in coordinated multipoint communication, a user equipment, and a base station. Background technique [0002] In the long term evolution (Long Term Evolution, LTE) system, the same frequency networking technology is used to improve the spectrum utilization rate, which requires the introduction of downlink interference control technology between the same frequency cells, downlink coordinated multiple point transmission (Downlink Coordinated Multiple Points Transmission, DL CoMP) technology is introduced as a downlink co-frequency interference control technology. By coordinating and configuring the time-frequency resources, power resources, and air space resources of multiple cells, it can solve the problem of cell edge interference in a networking environment with strong downlink interference between co-frequency cells. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04B7/024H04L5/00
CPCH04B7/024H04L1/0026H04L5/0035H04L1/00
Inventor 鲍坤超曲秉玉谭婷
Owner HUAWEI TECH CO LTD