Feedback method and device

A feedback mode and scheme technology, applied in the field of communications, can solve the problems of high signaling overhead and adverse system spectral efficiency, and achieve the effects of reducing signaling overhead and improving spectral efficiency.

Active Publication Date: 2010-12-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many kinds of coordinated multi-point transmission schemes, such as downlink single-user joint processing, downlink multi-user joint processing, downlink beam coordination, or downlink scheduling coordination, etc., in the prior art, for each coordinated multi-point transmission scheme may need to formulate Different feedback modes, that is, feedback content and feedback methods, so that the terminal can feed back channel state information to the base station according to an appropriate feedback mode; wherein, the cells corresponding to different feedback modes are the same, that is, no matter which one the terminal configures Feedback mode, the terminal needs to use all the cells in the cell set where it is located as the measurement target, and feed back all or part of the measured channel state information to the base station, so the signaling overhead of the feedback is large, which is not conducive to improving the spectrum of the system efficiency

Method used

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Examples

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Embodiment 1

[0038] This embodiment can be implemented, for example, by a terminal.

[0039] A feedback method, comprising: determining a feedback mode, determining a measurement set corresponding to the feedback mode according to the determined feedback mode, measuring the determined measurement set, obtaining channel state information, and feeding back the obtained channel state information to a base station, Such as figure 1 As shown, the specific process can be as follows:

[0040] 101. Determine the feedback mode;

[0041] For example, a feedback mode delivered by the base station may be received, where the feedback mode is determined by the base station according to the downlink coordinated multi-point transmission mode or component carrier; or,

[0042] It is also possible for the terminal to select the downlink CoMP transmission mode or component carrier, and then determine the feedback mode according to the downlink CoMP transmission mode or component carrier. Of course, if the ...

Embodiment 2

[0056] This embodiment can be implemented, for example, by a base station.

[0057] A feedback method, comprising: determining a feedback mode according to a downlink coordinated multi-point transmission mode or a component carrier; sending the determined feedback mode to a terminal for the terminal to determine a measurement set corresponding to the feedback mode; thereafter The channel state information fed back by the terminal can be received, wherein the channel state information is obtained by the terminal by measuring the measurement set; for example figure 2 As shown, the specific process can be as follows:

[0058] 201. Determine a feedback mode according to a downlink coordinated multi-point transmission mode or a component carrier.

[0059] Wherein, the feedback mode includes feedback content and feedback method. Each downlink coordinated multi-point transmission mode includes at least one downlink coordinated multi-point transmission scheme, and each downlink coo...

Embodiment 3

[0076] According to the methods described in Embodiments 1 and 2, the following examples will be used to describe in detail.

[0077] For example, downlink coordinated multi-point transmission schemes or component carriers can be classified according to the operator's strategy or system requirements. For example, downlink coordinated multi-point transmission schemes can be classified based on different feedback content and feedback methods, corresponding Accordingly, the feedback modes corresponding to the CoMP transmission can also be divided into several feedback modes, so that these downlink CoMP transmission modes and the feedback modes are in one-to-one correspondence. Moreover, based on different feedback modes, each user, that is, each terminal, may be configured with different measurement sets and / or reporting sets, that is, different feedback modes correspond to different measurement sets and / or reporting sets.

[0078]Each downlink CoMP transmission mode may include ...

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Abstract

The invention discloses a feedback method and a device in a coordinated multiple point (CoMP) transmission system. The embodiment of the invention adopts corresponding feedback modes which are set based on different transmission modes or member carriers, and configures different measurement sets for a terminal according to the different feedback modes, so that after the feedback mode is determined, the terminal can determine the corresponding measurement sets according to the feedback mode and feed the channel state information measured by the measurement set back to a base station, thereby avoiding the problem in the prior art that no matter which feedback mode is configured for the terminal, the terminal needs to take the same cell sets as measurement objects so as to feed all or partial measured channel state information back to the base station. Compared with the prior art, the invention has the advantages of greatly reducing feedback signaling expenses and being favor for improving the frequency spectrum efficiency of the system.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a feedback method and device. Background technique [0002] In the fourth generation mobile communication system, CoMP technology plays an irreplaceable role in greatly improving spectrum efficiency. The so-called coordinated multi-point transmission technology refers to multiple geographically separated access points (Access Points) providing data transmission services for one or more users at the same time. [0003] For the coordinated multi-point transmission technology, before performing coordinated multi-point transmission or reception, the terminal (UE, User Equipment, user equipment, that is, the terminal) needs to feed back (or report) the channel state information ( CSI, Channel State Information), that is, the terminal sends the channel state information between the terminal and the candidate access point (or access point set) to the base station, so tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/10H04B7/02H04B7/04
CPCH04B7/0417H04W24/10H04B7/024
Inventor 万蕾任晓涛夏媛闫志宇夏亮
Owner HUAWEI TECH CO LTD
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