针对视频传感器网络协作通信的中继选择和多样性服务质量需求保障等问题,提出了基于GOP与距离感知的协作ARQ机制.基于传感器节点物理属性和MPEG-4编码算法,综合考虑了影响视频传输的各种因素,建立了网络状态感知分析模型,在此基础上建立了距离感知的中继选择机制,并根据应用业务需求确定最佳差错控制方案.数学分析和仿真实验表明,所提策略在视频播放质量、实时性和能效方面表现出了比传统ARQ和距离感知的协作ARQ更优越的性能.%There are two critical factors in cooperative communication of video sensor networks;relay selection and diversity of the quality of service guarantee of end to end communication. Therefore, this paper proposed the cooperative ARQ protocol based on GOP and distance aware. According to the physical characteristic of sensor node and the MPEG-4 encoding algorithm, it provided the mathematical analytical model of network station-aware, which was used to research the influence of video communication performance. It established a cooperative ARQ based on the awareness model, which was able to select the relay nodes adaptively and guarantee the diversity of the quality of service of video streaming. The mathematical analyses and simulation results show that the proposed mechanism can perform better in terms of video quality assessment, real time performance and energy efficiency, compared to the traditional ARQ and distance aware cooperative ARQ alone, with adapting to the fluctuation of the video sensor network state dynamically.
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