无线VoIP系统的服务质量分析与改善

IP网络的服务质量(QoS),包括带宽、丢包率、时延和时延抖动4个指标.根据具体情景的设定,研究了无线VoIP网络中带宽和时延的关系以及时延改善的问题.得出了无线VoIP网络的时延预算公式.通过构建一个越洋电话的场景分析,得出无线接入的排队和处理时延上限大致为10 ms与4 ms.通过设置具体的数据和语音业务,构建一个具有两级优先机制的网络仿真模型,分三种情况展开研究,分析了各种满足系统QoS的离散带宽和时延的关系.提出了两种可以减少多业务环境下语音时延与带宽消耗的方法.

ANALYSIS AND IMPROVEMENT OF QOS IN WIRELESS VoIP SYSTEM

The quality of service(QoS) of IP network includes bandwidth,rate of package loss,delay and delay-jitter.Based on specific scenario,this essay focuses on the relationship between bandwidth and delay of wireless VoIP network.We firstly provide the theory model of the delay of wireless VoIP.And next the queuing and proess delay of the wireless hop is estimated at 10 ms and 4 ms respectively.Then a two-priority network model is established based on OPNET 10.0.Finally,three different conclusions are drawn according to different data and voice traffic,through which two creative method to decrease the WVoIP delay is given to improve the performance of its QoS.