Method and device for controlling cooperative transmission of downlink signal in wireless communication system

Abstract

The invention provides a method and a device for controlling one main base station and one or more cooperative base stations to cooperatively communicate with a user terminal on downlink data in a wireless communication system adopting cooperative MIMO technology. The technical scheme of multi-base station cooperative MIMO provided by the invention is as follows: MIMO downlink channel information from the main base station and the cooperative base stations to the user terminal is acquired, and further the downlink signal pre-coding information from the main base station and the cooperative base stations to the user terminal, and the main base station and the cooperative base stations are cooperatively communicated with the user terminal on MIMO downlink data according to the downlink signal pre-coding information. The technical scheme is applicable to a communication mode which has unequal uplink and downlink, such as an FDD and the like, has lower signaling and feedback overhead, expands the cell coverage and communication capacity of cell-edge users, reduces the interferences from adjacent cells, has smaller flyback information bandwidth, extends the functions of the prior single user MIMO and multiuser MIMO which are based on the single base station and causes little change on the prior technology and network and is easy to be standardized.

Description

technical field [0001] The present invention relates to a wireless communication network, in particular to a wireless communication network based on multi-base station cooperative MIMO technology. Background technique [0002] In a wireless communication system, MIMO (Multiple Input Multiple Output) technology uses multiple antennas at a wireless transmitting end and a receiving end to improve the communication capability between them. In MIMO technology, the relatively mature single-user MIMO corresponds the time-frequency resources of the base station and the user terminal one by one. communication capabilities. However, as the number of users increases, it is necessary to consider that multiple users share the same time-frequency resources for communication, so multi-user MIMO has received extensive attention and research. In multi-user MIMO, the base station communicates with multiple different user terminals simultaneously on the same time-frequency resource through m...

AI Technical Summary

Problems solved by technology

However, in the frequency division duplex (FDD) mode, the frequency difference between the uplink and downlink carriers generally exceeds the coherent bandwidth of the channel, so the uplink and downlink channel fading are not correlated with each other, causing the main base station and the cooperative Base stations cannot determine their respective downlink channel information based on uplink channel fading

Then, the main base station and the coordinated base station cannot determine the corresponding downlink precoding matrices, so they cannot perform cooperative MIMO downlink data communication with the user terminal

There is no method that can effectively solve this problem in the prior art

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