基于QoE的VoIP带宽分配机制研究

Research on QoE-based Bandwidth Allocation Mechanism for VoIP

利用比例积分微分(PID)控制理论控制IP语音(VoIP)数据流带宽需求和用户体验(QoE)之间的平衡关系,并将该信息纳入带宽再分配模型中,提出一个基于QoE的带宽分配机制QBAV(QoE-based bandwidth allocation mechanism for VoIP application),它在满足用户期望QoE的同时兼顾带宽分配的公平性。理论证明该算法满足非线性问题最优化约束条件,所分配带宽满足目标函数全局收敛。仿真结果表明,该算法分别以低于传统NRG算法9%及最新FC-MDI-S算法15%的带宽满足了90%以上用户的期望QoE,避免了现有带宽分配机制针对小部分高优先级数据流的弊端,提高了VoIP业务的整体性能及网络利用效率。

This paper used the Proportional Integrative Derivative （PID） control theory to allow a controlled trade-off between the bandwidth requirement of the VoIP data stream and its Quality of user Experience （QoE）,then quantifying the perception in the bandwidth reallocation model,proposed a QoE-based bandwidth allocation mechanism for VoIP （QBAV）,which maximizes the fairness between users while targeting the expected QoE.This paper proved the global optimum of the algorithm.The simulation shows that the proposed algorithm can meet about 90％ of users,comparing with the NRG algorithm and the latest FC-MDI-S algorithm,and the bandwidth cuts down 9％ and 15％ respectively.The existing algorithms rely on minor high priority data streams.Avoiding this problem,the proposed algorithm enhances the overall performance of VoIP and the network efficiency.