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Method for reducing downlink multipoint cooperation implicate feedback overhead

An implicit feedback, multi-point cooperative technology, applied in diversity/multi-antenna systems, space transmit diversity, electrical components and other directions, can solve problems such as ineffective effects

Inactive Publication Date: 2013-04-17
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this scheme can only reduce a small amount of feedback overhead, and the effect is not obvious when the number of cooperative cells is large and the number of resource blocks is large.

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  • Method for reducing downlink multipoint cooperation implicate feedback overhead
  • Method for reducing downlink multipoint cooperation implicate feedback overhead
  • Method for reducing downlink multipoint cooperation implicate feedback overhead

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Embodiment Construction

[0059] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0060] Step 1, dividing cells and selecting CoMP cells.

[0061] 1a) Divide the central area and the edge area

[0062] In this embodiment, the radius of the service cell is selected to be R meters, the range of the central area is 0 to r meters, and the range of the edge area is r to R meters. See figure 2 ;

[0063] 1b) Select a coordinated multi-point cell

[0064] When the user is located in the central area, only the serving base station provides services for the user;

[0065] When the user is located in the edge area, due to the path loss, a cell is selected from the L cells closest to the user according to the link quality to provide services for the user.

[0066] figure 2 Only consider the case when the user is in the edge area. h 0 、H 1 ......H L-1 c respectively 0 、c 1 ... c L-1 to the user's channel matrix.

[0067] In this embodiment, it is assu...

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Abstract

The invention discloses a method for reducing the downlink multipoint cooperation implicate feedback overhead, relating to the technical field of wireless communication. The invention mainly solves the problem of large feedback overhead in the prior art. Users only need to send feedback of CQI (Channel Quality Indication) respectively to a single link of each base station in downlink multipoint cooperation joint processing mode, and only an SNR (Signal to Noise Ratio) value of a single link needs feedback. A physical resource block is clustered on the basis, and C adjacent physical resource blocks are in one cluster. The smallest SNR on the C physical resource blocks in the cluster is taken as channel status information of the cluster, and an SNR threshold value is preset at a user side. Only when the user checks that the SNR of the cluster is larger than the preset threshold value, the feedback of the SNR of the cluster is sent to the base station side, and otherwise the channel status information of the cluster is discarded. The base station selects an appropriate TPCC structure according to the feedback SNR value to provide service for the user. The invention can greatly reduce the feedback overhead of users by selecting the appropriate SNR threshold value on the premise of little influence on system capacity.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for reducing the downlink CoMP implicit feedback overhead, which is used in the long-term evolution system of the next generation of mobile communication, and solves the feedback information of the user terminal under the CoMP framework in the wireless network volume problem. Background technique [0002] In order to meet the performance indicators of LTE-A, especially the performance requirements of LTE-A for cell-edge users, coordinated multi-point transmission technology is regarded as one of the important technologies to improve the performance of cell-edge users and effectively suppress inter-cell interference. [0003] In the downlink coordinated multi-point joint reception scenario, to realize coordinated transmission between multiple cells and users, the serving base station needs to obtain all channel information of the base stations in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04W72/08H04W72/54
Inventor 杨清海吕磊吕潇潇
Owner XIDIAN UNIV