Communication control server, base station, terminal and joint service system and method

Abstract

The invention aims to provide a communication control server, a terminal and a joint service system and method capable of improving the feedback precision to improve the system performance under the limited capacity of a feedback channel. The communication control server is provided with a network interface, a storage unit and a channel state information restoring part, wherein the storage unit stores a cluster information table and a channel state information table; the cluster information table keeps the joint codebook shared by the base stations in the cluster; the joint codebook keeps the channel state information distribution and the information identifier for determining the channel state information; and the channel state information restoring part obtains the feedback message of the terminal in the cluster from the base station through the network interface, extracts the channel state information corresponding to the information identifier included in the feedback message, and updates the channel state information table stored in the storage unit by use of the extracted channel state information, wherein the feedback message comprises the information identifier corresponding to the channel state information of the terminal.

Description

technical field [0001] The present invention relates to devices and methods for providing services in a mobile communication network. In particular, it relates to a communication control server, a base station and a terminal in a multi-base station joint service system. The mobile communication network mentioned here is a mobile communication system that supports joint service of multiple base stations. Background technique [0002] Coordinated multi-point transmission / reception (CoMP) has been recognized as a very good method to expand the coverage of high-speed data services, improve cell edge throughput and improve system average throughput in mobile networks , hereinafter referred to as the "United Services". [0003] figure 1 It is a schematic diagram briefly showing a multi-base station joint service scenario in a mobile network. exist figure 1 In this example, two base stations 1 and 2 are combined to serve one terminal 100 or terminal 200 at the same time. Wher...

AI Technical Summary

Problems solved by technology

[0020] First, due to the limited capacity of the terminal feedback channel, it is necessary to feed back the information identifier of the codebook corresponding to each base station and the phase information between the base stations at the same time. Therefore, when the capacity of the terminal feedback channel is limited, the Resources are limited, so the accuracy of feedback is reduced, and finer codebooks cannot be used

[0021] Second, in existing methods, in addition to the quantization error of single-cell CSI, there is also quantization error of phase information between cells

In the absence of a good distribution between the two, it will cause serious system performance degradation

[0022] Third, in the existing method, it is necessary to feed back the CSI between the terminal and all the base stations belonging to a cluster

However, none of the solutions to these problems

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