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Method and device for channel information feedback in coordinated multi-point transmission

A technology of channel information and multi-point coordination, applied in transmission systems, radio transmission systems, location diversity, etc., can solve problems such as insufficient resources, no design and discussion of service cell allocation, etc.

Inactive Publication Date: 2015-08-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For COMP, these resources are far from enough, and there is no design and discussion on how the serving cell needs to notify the UE of which cells' channel information to feed back and the resource allocation of these cells' channel information

Method used

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  • Method and device for channel information feedback in coordinated multi-point transmission
  • Method and device for channel information feedback in coordinated multi-point transmission
  • Method and device for channel information feedback in coordinated multi-point transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This embodiment is directed to the feedback mode A. In this feedback mode, the base station allocates multiple subframes to jointly complete the feedback of channel information of all cells in the COMP measurement set, and each subframe only maps channel quality information of one cell. Based on feedback method A, the feedback process of channel information is as follows: figure 1 As shown, the specific steps are as follows:

[0079] Step 101: The eNB notifies the UE of which coordinated cells or which cells in the measurement set to feed back the channel information (that is, the range of the measurement set) and which coordinated cell to feed back in which subframe through the physical downlink control channel (PDCCH) or high-level signaling Or measure the channel information of the cells in the measurement set, and map the channel information of the coordinated cell or the cells in the measurement set on which or which resources of the subframe;

[0080] Step 102: ...

Embodiment 2

[0086] This embodiment is aimed at method B. In this feedback method, the base station allocates a subframe for feeding back channel information of all coordinated cells or all cells in the measurement set. Using this method, the minimum delay can be guaranteed, and faster multiplexing can be performed. Click Collaboration Process. This way needs to increase the feedback overhead of one uplink subframe, and needs to expand the relevant feedback content of the original R8 and R9. The extended method can be:

[0087] Figure 6 For the present invention, the content generation process of feeding back the channel information of the coordinated cell or the cell channel information in the measurement set on the PUSCH is as follows:

[0088] Step 601, calculating the number of bits of channel information of each coordinated cell or a cell in a measurement set;

[0089]

[0090] Among them, O is the number of bits of channel information of each coordinated cell or the cell in th...

Embodiment 3

[0100] This embodiment is aimed at mode B. In this feedback mode, the base station allocates a subframe for feeding back the channel information of all coordinated cells or all cells in the measurement set, which requires an increase in the feedback overhead of an uplink subframe, and requires R8 and R9 The content of the feedback will be expanded. The extended method can be:

[0101] Figure 7 For this embodiment, the content generation process of feeding back the channel information of the coordinated cell or the cell channel information in the measurement set on the PUSCH is as follows:

[0102] Step 701, calculating the total number of channel information bits of the coordinated cell or the cell in the measurement set;

[0103]

[0104] Wherein O is the number of bits of the total channel information of the coordinated cell or the cells in the measurement set; Q' is the number of channel information bits to be transmitted on the PUSCH; and L is the number of check b...

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Abstract

The present invention discloses a method and a device for feeding back channel information in coordinated multi-point (CoMP) transmission, and solves the technical problem of uploading channel information of a plurality of coordinated cells or of cells in a measurement set in CoMP transmission. When channel information, for the same user equipment (UE), of all coordinated cells or of all cells in the measurement set is fed back, the present invention allocates a plurality of subframes for feeding back the channel information of all coordinated cells or of all cells in the measurement set, wherein channel information of at most only one coordinated cell or one cell in the measurement set is mapped in each subframe, or one subframe is allocated for feeding back the channel information of all coordinated cells or of all cells in the measurement set, or a plurality of subframes are allocated for feeding back the channel information of all coordinated cells or of all cells in the measurement set, wherein channel information of a plurality of coordinated cells or of a plurality of cells in the measurement set is mapped in each subframe.

Description

technical field [0001] The present invention relates to a long term evolution advanced system (Long term evolution advanced system, LTE-A), in particular, to a method and device for feeding back channel information of a cooperative cell or a cell of a measurement set during multi-cell cooperation in the LTE-A system . Background technique [0002] In LTE-A, in order to improve the average spectrum utilization rate of the cell and the spectrum utilization rate of the cell edge, a coordinated multi-point transmission (Coordinated Multi Point Transmission / Reception, COMP) technology and a multi-antenna enhancement technology are adopted. COMP technology is divided into CB (Cooperative Beamforming) and JT (Joint Transmission) technology, which can greatly improve the average spectrum efficiency of the cell and the service quality of the cell edge users. In particular, the JT technology can largely guarantee the quality of service for users at locations with poor channel quality...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04W68/00
CPCH04B7/024H04W24/10H04W72/04H04B7/0626
Inventor 郭森宝孙云锋张峻峰
Owner ZTE CORP
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