Method and device for transmitting CQI (channel quality indicator) information
A technology of transmission point and main transmission point, which is applied in the field of CQI transmission method and device, and can solve the problems of inability to predict the change of interference level, inability to reflect channel amplitude information, inability to complete terminal scheduling selection, etc.
Active Publication Date: 2014-07-09
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology
[0011] However, in the current LTE-A system, after the base station receives the CSI information calculated and fed back by the terminal referring to the execution mode of the LTE system, the scheduling of the terminal and the selection of the MCS (modulation and coding method) cannot be completed, because:
[0012] 1) Each transmission point may perform joint scheduling and precoding, and the PMI and relative phase information contained in the CSI information cannot reflect the amplitude information between channels;
[0013] 2) Due to the adoption of technologies such as cooperative scheduling / precoding and joint processing, the interference level of the terminal changes greatly before and after base station scheduling, and the terminal cannot predict the change of the interference level after scheduling when forming the feedback CSI information
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[0042] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0043] refer to image 3 , Figure 4 and Figure 5 As shown, in the embodiment of the present invention, the communication system (eg, LTE-A system) includes several base stations and terminals, wherein
[0044] The terminal includes a receiving unit 40, a first processing unit 41, a measuring unit 42, a second processing unit 43, and a sending unit 44, wherein,
[0045] The receiving unit 40 is configured to receive the downlink reference signal sent by each coordinated transmission point;
[0046]The first processing unit 41 is configured to obtain the channel matrix and PMI information of the corresponding coordinated transmission point according to the downlink reference signal sent by each coordinated transmission point;
[0047] A measuring unit 42, configured to measure the sum of interference and noise power from outside the coord...
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The embodiment of the invention provides a method and device for transmitting CQI (channel quality indicator) information, aiming to improve the calculation accuracy of the CQI information in a CoMP (coordinated multipoint transmission / reception) situation. The existing CQI information generation method can only generate the CQI information of single transmitting point, is difficult to obtain favorable multipoint coordination scheduling and precoding results and cannot accurately calculate a downlink CQI after scheduling. Moreover, by adopting the technical scheme provided by the embodiment of the invention, a terminal can obtain the CQI information of each corresponding coordinated transmitting point respectively according to a channel matrix and PMI (precoding matrix indicator) information corresponding to each coordinated transmitting point and the sum of interference and noise power beyond the measured coordinated transmitting points, and then send the CQI information of each coordinated transmitting point to a network side, thus the network side can implement more accurate scheduling and precoding, as well as link adaptation, and furthermore, the system performance can be promoted as a whole.
Description
technical field [0001] The present invention relates to the communication field, in particular to a CQI transmission method and device. Background technique [0002] In order to assist the base station in terminal scheduling and link adaptation, in CoMP (coordinated multipoint transmission / reception, coordinated multi-point transmission) in the LTE (Long Term Evolution) system, the terminal needs to report the CQI (Channel Quality Indicator, Channel Quality Indicator) information, that is, the terminal needs to feed back corresponding CQI information for the coordinated transmission point (including the main transmission point and the non-primary transmission point), which is used for the scheduling and link adaptation of the base station; wherein, each CQI corresponds to a certain time and frequency resources. [0003] The so-called CoMP refers to cooperative transmission among multiple geographically separated transmission points. Generally, multiple transmission points ...
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IPC IPC(8): H04W72/12H04L1/00
Inventor 倪浩高秋彬彭莹
Owner DATANG MOBILE COMM EQUIP CO LTD