TD-SCDMA系统中呼叫接入控制算法研究

Improved adaptive call admission control arithmetic in multi-traffic TD-SCDMA system

呼叫接入控制(CAC)是无线通信网络资源管理中一个重要的组成部分,CAC策略依据一定的准则决定呼叫到达请求的允许接入或拒绝接入,其中策略设计的好坏直接影响着网络的性能和资源利用率。目前,码分多址系统中的基于门限比较的接入控制算法是在理想条件下研究的,由于判定不能灵活控制管理,使得系统掉话率较高。对理想状态下的判定进行改进,提出了随着系统业务负荷变化的自适应调节算法。仿真结果显示,改进后的方案比以前有较好的性能,具有时延小、精度高、性能好、容易实现等特点。

Call admission control （CAC） is one of the most important parts in wireless communication network resource management. The system allows or refuses access according to certain standards under CAC strategy. The design strategy will have a direct impact on the performance of the network and resources utilization. In CDMA system the algorithm of access control is based on a comparison in the ideal conditions. This paper turned the original constant threshold into a adaptive one, whose threshold is determined with the change of systems business. The simulation results show that the scheme has better perform- ance than ever, less time delay, higher precision, better performance, and easier realization.