Method and system and base station for indicating feedback of multi-aerial system

A multi-antenna system and indication technology, applied in the field of feedback indication, can solve problems such as link performance impact, failure to obtain the best codebook, performance degradation, etc., and achieve the effect of improving the quality of information transmission

Inactive Publication Date: 2009-12-30
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0013] Rank backoff only provides a flexible transmission option for the MIMO system, but since the eNB side does not have actual downlink channel information, the rank backoff will lead to performance degradation
In addition, because the UE performs periodic feedback of rank, PMI and CQI according to channel characteristics, after the eNB configures low rank for the UE, the UE will still feed back the rank obtained according to the channel estimation and the corresponding PMI and CQI in the next feedback period. CQI, so that eNB can never obtain the best codebook after rank fallback
Therefore, the downlink data is always configured with PMI that does not match the channel and the corresponding PMI and CQI, and the link performance is greatly affected

Method used

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  • Method and system and base station for indicating feedback of multi-aerial system

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Embodiment Construction

[0032] In the current MIMO closed-loop precoding mode of LTE, rank backoff usually occurs in the following scenarios: (1) Rank, PMI, or CQI feedback errors; (2) eNB buffers do not have enough data transmission; (3) ) HARQ (Hybrid Automatic Repeat Request, Hybrid Automatic Repeat Request) mode; (4) the channel encounters sudden changes; (5) business communication of small data packets.

[0033] In the above scenarios, it is possible for the eNB to perform a rank fallback operation on the downlink data, but the inventor of the present invention found in the process of implementing the present invention that different scenarios should be different.

[0034] For scenario (1), the rank, PMI, or CQI feedback error is caused by the abnormality of the uplink feedback channel, not the change of the downlink channel. This situation is a short-term sudden event. After that, the UE performs rank fallback, but the UE can continue to feed back the actually available rank and the correspondi...

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Abstract

The embodiment of the invention discloses a method and a system and a base station for indicating the feedback of a multi-aerial system. The method comprises the following step: sending indicating information to user equipment UE, wherein the indicating information is used for indicating that the UE feeds back an order according to the indicating information and PMI and CQI corresponding to the order. The base station informs the UE of feeding back the order, the PMI and the CQI according to the indicating information through the indicating information so as to always obtain feedback parameters matched with transmission data, thereby the embodiment of the invention prevents unnecessary order backspacing operation under certain scenes and enhances the transmission quality.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a feedback indication method, system and device in a multi-antenna system. Background technique [0002] In MIMO (Multiple Input and Multiple Output) technology, multiple transmitting and receiving antennas are used at the transmitting and receiving ends, respectively, and signals are transmitted and received through multiple antennas at the transmitting and receiving ends, thereby improving each Quality of service for the user (bit error rate or data rate). For traditional single-antenna systems, MIMO technology can greatly improve spectrum utilization, enabling the system to transmit higher-speed data services in a limited wireless frequency band. With the development of technology, the future mobile communication broadband and wireless access convergence system has become a hot research topic, and MIMO system is one of the more research directions. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04B7/06
Inventor 李元杰
Owner HUAWEI TECH CO LTD
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