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在TD-SCDMA系统中,由于一个帧结构中包含了7个时隙,用来传送上行和下行业务,上下行时隙的分配被2个上下行切换点决定。这样的特点使得TD-SCDMA系统特别适合于当今越来越明显的上下行非对称业务的传输。目前使用的静态的分配上下行带宽的方法对于上下行非对称的业务的阻塞率特别大。针对TD-SCDMA系统可以动态调整上下行切换点的特点,分4种情况分析小区的干扰因子,其中着重分析了交叉时隙干扰;根据剩余容量和多媒体业务特点提出了一种动态调整上下行时隙切换点的呼叫接纳控制方案。仿真结果显示,本文所提出的接纳控制方案对于非对称业务的性能有明显的改善,对整个系统性能的提高起到很大的促进作用。
In a TD-SCDMA system, since one frame structure includes seven time slots for transmitting uplink and downlink services, the allocation of uplink and downlink time slots is determined by two uplink and downlink switching points. This feature makes the TD-SCDMA system particularly suitable for today’s increasingly obvious uplink and downlink asymmetric traffic transmission. The current method for allocating the uplink and downlink bandwidth statically has a particularly high blocking rate for asymmetric uplink and downlink services. TD-SCDMA system can dynamically adjust the characteristics of the uplink and downlink switching points, and analyze the cell interference factors in four different situations. The interference of the cross-timeslots is analyzed emphatically. Based on the remaining capacity and the characteristics of multimedia services, a dynamic adjustment of uplink and downlink is proposed Call Pickup Control Scheme for Gap Switch Points. Simulation results show that the admission control scheme proposed in this paper can significantly improve the performance of asymmetric services and greatly promote the performance of the whole system.