Interference coordination-based inter-cell user scheduling method

Abstract

The invention discloses an interference coordination-based inter-cell user scheduling method. The method comprises the following steps of: determining a target user, and acquiring a space signature of the user in a cell where the user is located; generating an orthogonal complement space of an interface space; searching the user of the space signature in the orthogonal complement space; and searching a schedulable user. The interference coordination-based inter-cell multi-user scheduling method disclosed by the invention not only needs no base station exchange information, but also effectively inhibits inter-cell interferences and improves the utilization ratio of wireless channel resources.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an interference coordination-based inter-cell user scheduling method. Background technique [0002] Many next-generation wireless communication standards currently being discussed, such as 3GPP’s LTE and LTE-Advanced, and IEEE 802.16m, all adopt the OFDMA access method, so that user information in the cell is carried on different subcarriers that are orthogonal to each other. Interference between carriers and within a cell can be basically avoided, and all interference comes from neighboring cells. A small frequency reuse factor will cause severe inter-cell interference and greatly reduce cell performance, so inter-cell interference must be effectively suppressed. Especially in the discussion of LTE-Advanced, Coordinated Multipoint (CoMP), as an enhanced technology, has become a hot topic of discussion, and the combination of CoMP and MIMO technology has become an...

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Problems solved by technology

[0003] Some literature proposes to use partial frequency reuse (SFR) technology, assuming that the frequency reuse factor of the center of the cell is 1, the frequency reuse factor of the edge is 3 or greater, and the frequency bands used by adjacent cell edge users are different, which can effectively suppress the inter-cell frequency reuse factor. interference, but the cell edge users can only use part of the frequency band, so the frequency selective scheduling gain and peak rate are low

There is also a technology to precode at the transmitter, and suppress inter-cell interference through channel block diagonalization, but it requires the cooperation of all cells in the system, which is complex and inefficient.

There are also literatures that propose the use of frequency hopping to reduce inter-cell interference, which is a direct extension of existing methods, but the design of frequency hopping patterns is difficult and difficult to implement

At present, some scholars try to extend the proportional fair scheduling algorithm to the case where the frequency reuse factor is 1 and propose the SerFR algorithm, which improves the frequency selective scheduling gain of edge users, but the ability to improve inter-cell interference is limited.

Beamforming technology is also a commonly used method of eliminating interference. Beamforming can be used to align the transmit power in the direction of the receiving end and reduce the interference received by the receiving end in other directions. However, how to determine the beamforming vector and how to effectively feedback the The current channel scenario is also a very difficult problem

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