摘要： 提出一种用于无线多媒体网络增强型速率降级呼叫准入控制算法，在新窄带呼叫请求到达时对宽带呼叫速率的降级程度进行优化，从而实现最优化呼叫层的服务等级(GoS)。利用马尔可夫模型对算法进行分析，通过分析结果及各种呼叫的到达速率，采用穷举法获得最佳门限值。数值仿真结果表明，与传统的非优化速率降级方案相比，该算法能够获得更好的GoS。

关键词: 呼叫准入控制, 服务等级, 代价函数, 马尔可夫模型, 无线网络

Abstract: This paper proposes an Enhanced Rate Degradation Call Admission Control(ERDCAC) algorithm for multimedia wireless network to maximize Grade of Service(GoS). The degree of maximum degradation for Wide-Band(WB) when new Narrow-Band(NB) arrives is optimized. It develops a Markov model to analyze ERDCAC, and along with the measurements of call arrival rates of all traffics, the optimal threshold variable to acquire the maximal GoS is obtained by using exhausting search. Numeric results show that ERDCAC acquires better GoS compared with traditional rate regulation Call Admission Control(CAC) scheme.

Key words: Call Admission Control(CAC), Grade of Service(GoS), cost function, Markov model, wireless network

中图分类号: 

• TP312