Adaptive scheduling method and apparatus reducing information feedback amount

Abstract

The invention discloses a self-adaptive scheduling method for a multi-user MIMO system. A transmitting terminal counts reporting times of various vectors or matrixes in a codebook first based on feedback information from a plurality of receiving terminals; then, according to the counted reporting times, the transmitting terminal determines a group of weights for the vectors or the matrixes in thecodebook, and informs all transmitting terminals of the group of the weights through a downgoing common control signaling. In the process of communication, the weights are updated according to requirements. Each receiving terminal receives the informed weights, calculates channel quality information, proceses the channel quality information by the weights, and makes a choice of the recoded vectors or matrixes and feeds back according to the processed channel quality information. The self-adaptive scheduling method can simultaneously gain higher quantized precision and other benefits brought by scheduling gain and a larger codebook in the multi-user MIMO system.

Description

technical field [0001] The present invention relates to an adaptive scheduling method and device for reducing the amount of information feedback, in particular to a method and device for reducing the amount of feedback information in an adaptive multi-data stream transmission system in a high-speed wireless communication system, which is applicable to various cellular systems Under the high-speed wireless communication system, and high-throughput wireless local area network system. Background technique [0002] In high-speed data communication systems, simultaneous transmission of multiple data streams can effectively improve transmission efficiency. A Multiple-Input Multiple-Output (MIMO: Multiple-Input Multiple-output) system is an example of a multiple data stream transmission system. The advantage of the MIMO system is that it can provide multiple available sub-channels in the airspace, so that diversity gain and multiplexing gain can be obtained through different trans...

AI Technical Summary

Problems solved by technology

[0015] The advantage of the first type of scheme is that it completely eliminates the interference of multiple users, but the disadvantage is that it is possible to weaken the power of useful signals while eliminating interference

The advantage of the second type of method is that it can avoid weakening the power of the useful signal to a certain extent, but its disadvantage is that there is residual multi-user interference, and the requirements for the receiver algorithm are higher than those of the first type of method

[0022] However, the problems of these schemes are: 1) In order to obtain multi-user scheduling gain, a smaller codebook is used in multi-user MIMO transmission, which inevitably introduces a larger quantization error, thereby reducing the received SNR; 2) Multi-user MIMO transmission and single-user MIMO transmission use smaller and larger codebooks respectively, resulting in non-uniform codebooks for different transmission modes. In the implementation of the system, it is necessary to switch between the two codebook modes, which improves the Complexity of System Design

At the same time, if frequent switching is used, a large control signaling load will be introduced

Images