无线网络中实时性服务区分的转发节点队列调度方法研究

Differ-service supported queue management method for replay node in wireless network

无线网络中数据服务类型的增加导致多种应用数据在同一网络上进行传输。这些数据分为有实时性要求的多媒体数据（multi—data）和时间不受限的常规数据（gene—data）：在无线多跳网络中，单个转发节点的时延过高将产生累计效应，导致实时性服务不可用。以减少实时数据的时延为目的，同时兼顾稳定性和公平性，提出了按照奕时性对数据包进行区分队列管理，按照动态转发比率n进行调度发送的策略。n的数值可以根据实际应用采用动态自适应的方式进行设置。通过数学分析和计算机仿真得出结论，在转发速率恰当设置，此方法能够在保持非实时数据包时延可容忍的情况下，可以将多媒体数据包的平均传输时延降低30％～60％。同时，该方法对数据包转发顺序进行了重排，减少了数据抖动，尤其对于提升多媒体数据的服务质量有很大的帮助。

Multi-media service and general service, such as HTML service, transfer in one wireless networks at the same time. So the data transferred in the network can be classified into multi-data （real-time service） and general-data （time unimportant service）. When these data were replayed by middle-node in the route, this paper created two queues. One stores muhidata and the other stores gene-data temporarily. Adjusted the sequence of replay based on switch ratio n,which meaned, send n muhi-data packages and one gene-data package. The results got by mathematic analysis and computer simulation, present this method could save about 30% - 60% multi-data＇ s delay and balance the jitter of multi-media service.