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A method and device for transmitting cqi

A technology of transmission point and main transmission point, applied in the field of transmission CQI, which can solve the problems that there is no measurement scheme for multiple transmission points, and the accuracy is affected.

Active Publication Date: 2011-12-21
DATANG MOBILE COMM EQUIP CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing measured CQI and SRS measurement are all for a single transmission point, and there is no measurement scheme for multiple transmission points
If the existing CQI and SRS measurement results are used, the accuracy of operations such as scheduling and link adaptive adjustment will be affected

Method used

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  • A method and device for transmitting cqi
  • A method and device for transmitting cqi
  • A method and device for transmitting cqi

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Embodiment Construction

[0036] In the embodiment of the present invention, CQI is calculated for multiple transmission points, especially considering the sum of interference and system noise power outside the multiple transmission points, the CQI obtained in this way enables the scheduling and link adaptive adjustment in coordinated multi-point transmission And so on to be more accurate.

[0037] In this embodiment, multiple transmission points constitute a transmission point set c j , or the multiple transmission points in this embodiment refer to the set of transmission points c j transfer point in . For a certain UE, the set of transmission points c j One of the transmission points is the master transmission point, and the other transmission points are cooperative transmission points. The primary transmission point refers to the transmission point that sends useful signals to the UE in coordinated scheduling / beamforming and dynamic transmission point selection, and a transmission point designat...

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Abstract

The invention discloses a method for transmitting channel quality indication (CQI), which is used for realizing transmission of the CQI aiming at multiple transmission points so as to improve the accuracy of scheduling and reduce interferences between neighbor cells. The method comprises the following steps of: receiving reference signals transmitted by multiple transmission points; by aiming at each transmission point, constructing a channel matrix Hij, n according to the reference signal transmitted by the transmission point; measuring the sum In of interferences and system noise power outside the multiple transmission points; calculating the CQI of a main transmission point according to the channel matrix H0j, n of the main transmission point in the multiple transmission points and the In, and by aiming at each collaborative transmission point except the main transmission point in the multiple transmission points, calculating the CQI of the collaborative transmission point according to the H0j, n of the main transmission point and the Hij, n of the collaborative transmission point; and at least transmitting the calculated CQI of the multiple transmission points to the main transmission point. The invention also discloses a device for implementing the method.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for transmitting CQI. Background technique [0002] In order to assist the base station in user scheduling and link adaptation, in an LTE (Long Term Evolution) system, a terminal needs to report channel quality indicator information (CQI) from the base station to the terminal. Each CQI corresponds to certain time and frequency resources. The user equipment (UE) needs to perform measurements based on reference signals such as cell-specific reference signals (CRS) or channel-state information reference signals (CSI-RS) transmitted by the base station, and calculate and feed back CQI. Feedback includes periodic feedback and aperiodic feedback. Periodic feedback includes 4 feedback modes of 1-0, 2-0, 1-1 and 2-1, and these feedback modes include 1, 1a, 2, 2a, 2b, 2c, 3, 4, 5 and 6 in total 9 report type. The reporting information of reporting types 1, 1a, 2,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04W72/12H04L1/00
CPCH04L1/0026H04L1/00H04W72/12H04L2001/0092
Inventor 倪浩高秋彬彭莹张然然
Owner DATANG MOBILE COMM EQUIP CO LTD
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