一种多媒体CDMA/TDD系统中的时隙分配方法

A Time Slot Allocation Strategy for the CDMA/TDD Systems with Multimedia Services

多媒体业务的一个显著特点就是上下行链路之间的业务不均衡。TDD模式的移动通信系统很好地解决了这个问题。而对于CDMA/TDD蜂窝系统来说 ,使得系统资源利用率最高的时隙分配方案是必需的。提出了一种CDMA/TDD多媒体业务系统中的最优时隙分配方法 ,分析了在系统干扰的约束下 ,这种时隙分配方法的可行性和性能 ,并且指出了最优时隙分配不仅受小区业务不均衡因子的影响 ,而且要受小区负载不平衡程度的影响。

A prominent issue in wireless multimedia communications is the traffic asymmetry between uplink and downlink. The asymmetrical slot allocation in the CDMA/TDD systems can be a good solution for this problem. However, the level of traffic asymmetry may be significantly different from cell to cell. In this paper, an optimum time slot allocation strategy for the CDMA/TDD systems with multimedia services is proposed. The utilization coefficient of the CDMA/TDD systems for a multicell model is analyzed taking intercell interference into account. Based on this analysis, an optimal slot allocation that maximizes the system resource utilization coefficient is presented.\;