基于GOP取帧和跳数的自适应协作ARQ

为给多媒体数据传输提供有效QoS保障，提出一种适用于无线多媒体传感器网络数据传输的自适应协作ARQ机制。采用跨层设计的方法，分析ARQ机制协作传输跳数与能效的规律，根据节点间通信距离自适应选取最优协作传输跳数，结合数据帧跳数，自适应调整最大重传次数，根据快进快退码率基于帧间依赖关系进行GOP取帧。分析结果表明，该机制在丢包率和端到端平均时延方面与传统ARQ相比具有较优的性能，能有效提高无线多媒体传感器网络通信的可靠性和实时性。

Adaptive Cooperative ARQ Based on GOP Fetching Frame and Hop Count

This paper proposes an adaptive cooperative Automatic Repeat request(ARQ) mechanism based on cross-layer design for Wireless Multimedia Sensor Network(WMSN),in the hope that the QoS guarantee of data transmission can be greatly improved.The hops of data packets are adjusted adaptively according to the characteristics of the energy consumption with communication distance of the cooperative ARQ.The mechanism adaptively adjusts the maximum retransmission time according to the hops of data packets.The GOP fetching frame model based on the fast forward/backward rate is proposed.Analysis result shows that the proposed mechanism can obtain better quality of multimedia data transmission than traditional ARQ,in terms of frame rate,reliability,real-time performance.