移动计算中2种呼叫接入控制优化策略的分析与比较

Analysis and comparison of two optimized call admission control schemes in mobile computing environment

在介绍DT-CAC和RBDO-CAC这2种呼叫接入控制优化策略的基础上,通过NS-2工具对这2种策略在不同呼叫流量强度下的性能进行仿真测试,并与传统的NCB策略进行对比。研究结果表明：DT-CAC和RBDO-CAC优化策略的性能均比NCB方案的性能好,从整体上看,RBDO-CAC策略的切换呼叫掉线率和新呼叫阻塞率比DT-CAC的低,且其系统资源利用率比DT-CAC的高;在网络呼叫流量较高的情况下,RBDO-CAC策略资源利用率比DT-CAC策略高2%～5%。

After two optimized call admission control schemes known as DT-CAC and RBDO-CAC were presented,the performances of these two schemes at different call traffic intensities were tested using NS-2, and compared with traditional NCB scheme. The results show that both DT-CAC and RBDO-CAC can achieve better performances than NCB. On the whole, when compared with DT-CAC, RBDO-CAC has lower handoff call dropping probability and new call blocking probability, and higher system resource utilization rate. The system resource utilization rate under high call traffic load of RBDO-CAC can be 2%-5% higher than DT-CAC.