Method for the same base station to control multi-cell system to allocate downlink resources

Abstract

The invention provides a method for a same base station to make multi-cell system distribute downlink resources. The downlink resources of a service cell are divided into a priority scheduling resource and a residual scheduling resource which are distributed for a user in the service cell. For the priority scheduling resource, a zero forcing wave beam forming technology is adopted; precoding is performed to the user who need to be scheduled in the priority scheduling resource based on PMI and CQI reported by the user according to a proportional fair principle; the scheduling user and the priority scheduling resource distributed for the scheduling user are acquired. For the residual scheduling resource, a collaboration user is determined according to the CQI reported by the user and collaboration information; the zero forcing wave beam forming technology is adopted; the precoding is performed to the collaboration user and the user who are not being scheduled according to the proportional fair principle; the residual scheduling resource is distributed so as to prevent from interference of an adjacent cell. By using the method of the invention, a data volume of downlink channel detection information reported by the user can be reduced and a calculated amount is reduced too.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a method for the same base station to control a multi-cell system to allocate downlink resources. Background technique [0002] In the next generation mobile communication system, Orthogonal Frequency Division (OFDM) is adopted as the downlink multiple access technology to improve spectrum utilization. In such a mobile communication system, the same base station can control downlink resource scheduling of multiple cells, and the multiple cells are adjacent cells to each other. Each cell is configured with multiple transmit and receive antennas, and users in each cell are also configured with multiple transmit and receive antennas. When each cell allocates downlink resources to users, precoding technology is used. [0003] In the multi-cell system controlled by the same base station, each cell controlled by the same base station is allocated the same frequency band, and differen...

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Problems solved by technology

[0007] Using the above method to allocate downlink resources to users in each cell controlled by the same base station has disadvantages: 1) This method requires users who are interfered by adjacent cells to report detailed downlink channel detection information to the serving cell, that is, downlink channel correlation Matrix, which additionally occupies a large amount of uplink resources; 2) In the cooperative precoding process based on the SLNR criterion, the computational complexity is high, and it is sensitive to the non-ideal characteristics of the downlink channel used by the downlink resources

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