无线多媒体网络中应用降质策略的呼叫准入控制研究

提出了无线多媒体网络中一种应用降质策略的呼叫准入控制算法,通过降低某些可容忍质量下降的呼叫的质量,来获得小区中所有业务的呼叫阻塞率和切换呼叫掉线率均很小的性能改善.为降低在网络负载较大时多媒体业务过快的降质速度,算法针对3种不同降质水平采取了不同的策略.仿真结果显示该算法简单易实现,具有很低的呼叫阻塞率、实时业务呼叫掉线率和带宽损失比例,优于现有的其他方案.

Call Admission Control Using Quality Degradation Strategy in Wireless Multimedia Networks

This paper presents a call admission control scheme using quality degradation strategy to provide QoS in wireless multimedia networks.The proposed scheme is adaptive to bandwidth of multimedia call,which keeps the total call blocking probability and dropping probability for real time traffics lower than those in the fixed reservation scheme at a price of slight degradation of multimedia calls.Different policies are enforced for three different degradation levels to prevent fast bandwidth loss especially under heavy load conditions.Simulation results show that the proposed call admission control scheme outperforms other known schemes in terms of smaller CBP and CDP for real-time traffic and slower degradation in heavy load network traffics.