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为降低应答信号开销,IEEE 802.15.3高速个域网引入了延时应答机制。为解决个域网延时应答因无法适应视频业务的变速率特性和无线链路的不稳定性,并会严重降低视频业务性能,在针对视频应用分别分析立即应答和固定突发MAC帧数延时应答策略的基础上,利用视频帧尺寸信息和无线信道质量信息对延时应答策略进行优化,提出了一种应用层和信道质量信息辅助的自适应延时应答算法。仿真结果表明:该算法在不同负载及信道情况下较立即应答策略和固定突发MAC帧数延时应答策略明显改善视频业务服务质量,可提高视频业务的可解帧率性能约2%~4%。
To reduce the response signal overhead, IEEE 802.15.3 high-speed personal area network introduces a delay response mechanism. In order to solve the problem of delay response of personal area network due to the inability to adapt to the variable rate characteristics of video services and the instability of wireless links and severely reduce the performance of video services, Time response strategy based on video frame size information and wireless channel quality information, an adaptive delay response algorithm based on application layer and channel quality information is proposed. The simulation results show that the proposed algorithm can improve the service quality of video services significantly when compared with the strategy of immediate response and fixed-burst MAC frame delay response under different load and channel conditions, which can improve the performance of the video service at a rate of about 2% ~ 4 %.