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Feedback method of channel quality index (CQI) and apparatus thereof

A channel quality indication and feedback device technology, applied in the CoMP field, can solve problems such as high feedback overhead and inability to accurately determine the coordination set, and achieve the effect of reducing feedback overhead and ensuring feedback accuracy

Active Publication Date: 2012-06-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the main purpose of the present invention is to provide a channel quality indication feedback method and device to solve the problem that the network side cannot accurately determine the coordination set used for the UE according to the CQI feedback from the UE and the existing CQI feedback mechanism. Existing problem of too much feedback overhead

Method used

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  • Feedback method of channel quality index (CQI) and apparatus thereof
  • Feedback method of channel quality index (CQI) and apparatus thereof
  • Feedback method of channel quality index (CQI) and apparatus thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0074] In this embodiment, the CQI is a linear value corresponding to the Signal to Interference plus Noise Ratio (SINR).

[0075] In this embodiment, the transmission type of Intra-site SU JP (Intra-site singleuser Joint Processing) is adopted, such as image 3 As shown, the CoMP measurement set determined by the network side is composed of cell 1, cell 2, and cell 3. Among them, cell 1 is the primary serving cell of the UE, such as Figure 4 As shown, the CoMP measurement set includes three types of cooperative sets: the first type is primary serving cell 1+cell 2; the second type is primary serving cell 1+cell 3; the third type is primary serving cell 1+cell 2+ District 3. Among them, when the cooperative set is the primary serving cell 1+cell 2, the primary serving cell 1 and cell 2 serve the UE together, and cell 3 is the UE’s interfering cell, and when the coordinated set is the primary serving cell 1+cell 3, the primary serving cell 1 When serving the UE together with cell...

Embodiment 2

[0106] In this embodiment, the Intra-site CS / CB transmission type is used between the network side and the UE, such as Image 6 As shown, the CoMP measurement set determined by the network side is composed of cell 1, cell 2, and cell 3. Cell 1 is the primary serving cell of the UE, and the coordinated set included in the CoMP measurement set is exactly the same as the first embodiment.

[0107] Step 1: UE according to Figure 4 For each cooperative set listed, calculate the CQI in non-cooperative mode non-comp , The first type of collaborative set and the second type of collaborative set averaged And the CQI of the third cooperative set 1, 2, 3, CB .

[0108] First, the UE calculates the CQI in the non-cooperative mode, that is, the CQI when only the primary serving cell 1 serves the UE non-comp , The specific process and embodiment one calculate CQI non-comp The process is exactly the same.

[0109] Secondly, according to UE Figure 4 List various cooperative sets, and calculate...

Embodiment 3

[0128] In the following description, the independent CQI of each cell is a linear value corresponding to the SINR.

[0129] In this embodiment, the Intra-site SU JP transmission type is adopted, and the CoMP measurement set determined by the network side is composed of cell 1, cell 2, and cell 3. The specific example is image 3 As shown, where cell 1 is the primary serving cell of the UE, the three cooperative sets included in the CoMP measurement set are as Figure 4 As shown, it is the same as the first embodiment.

[0130] Step 1: The UE separately calculates the independent CQI of each cell in the current CoMP measurement set and the interference average value δ of all the cells interfered with the UE except the primary serving cell.

[0131] First, the UE separately calculates the independent CQI of cell 1 1 , Cell 2 independent CQI 2 CQI independent of cell 3 3 . Here, for any cell, the UE calculates the ratio of the power of the user signal served by the UE to the interferenc...

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Abstract

The invention discloses a feedback method of a channel quality index (CQI). The method mainly comprises the following steps that: the user equipment (UE) acquires the CQI of a non-cooperative mode in a current coordinated multi-point transmission / reception (CoMP) measurement set, the CQI when all cells participate in cooperation in the current CoMP measurement set and the average CQI when parts of the cells participate in the cooperation in the current CoMP measurement set, and feeds back the each obtained CQI to a network side; or the UE acquires the independent CQI of the each cell in the current CoMP measurement set and an interference average delta of interference generated by all the cell itself except a main service cell, and feeds back the acquired CQI and the interference average delta to the network side. The invention also discloses a corresponding CQI feedback apparatus. In the invention, the network side obtains all the CQIs under the condition of the cooperation set comprised by the current CoMP measurement set and the CQI during non-cooperative transmission so that the cooperation set which is appropriate for the UE can be accurately determined. Feedback cost can be reduced under the condition of guaranteeing feedback precision.

Description

Technical field [0001] The present invention relates to CoMP technology, in particular to a feedback method and device for channel quality indicator. Background technique [0002] In order to improve the cell edge and the average throughput of the cell, and expand the coverage area of ​​high data transmission rate, the advanced long-term evolution (LTE-A, Advanced Long-Term Evolution) system has introduced Coordinated Multi-Point Transmission (CoMP). transmission / reception) technology. [0003] The current downlink CoMP technology is divided into two categories: the first is joint processing technology (JP, Joint Processing): each node in the cooperative set can obtain data information, and at the same time the physical downlink shared channel (PDSCH, Physical Downlink Shared Channel) data passes Multiple nodes or one node transmit; the second is coordinated scheduling (CS / CB, Coordinated Scheduling and / orBeamforming): the transmitted data information is only obtained in the servi...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/16
Inventor 任敏张晨晨孙云锋郭森宝
Owner ZTE CORP
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