关键词: 无线网络编码,链路质量感知,机会转发,动态优先级

Abstract: Wireless link quality has a significant impact on communication performance,which is currently not taken by most existing wireless network coding mechanisms into account,resulting in degradation of network throughput．To address this problem,this paper proposed a link-quality-aware opportunistic network coding mechanism(LONC)for wireless networks．By taking advantage of broadcast nature of wireless communication,this mechanism combines network coding with opportunistic forwarding techniques．As a metric for measuring transmission efficiency,the expected number of transmissions is used to compute the utility value of data transmission．On this basis,we assigned dynamic priority with each packet to be sent in accordance with their utility value．The objective is to ensure that packets with high-priority have a better chance to be forwarded,thus achieving much higher throughput．Our simulation results demonstrate that LONC can not only achieve performance improvement of network throughput,but also enhance data transmission quality to some certain extent.

Key words: Wireless network coding,Link-quality-aware,Opportunistic forwarding,Dynamic priority