无线多媒体传感器网络MAC层信道退避算法  

MAC layer channel backoff algorithm for wireless multimedia sensor networks

作　　者：陈长英[1,2] 付勇[2] 姜树明[1] 郑晓势[2] 

机构地区：[1]山东省科学院情报研究所,山东济南250014 [2]山东省计算中心,山东济南250014

出　　处：《传感器与微系统》2013年第10期134-138,141,共6页Transducer and Microsystem Technologies

基　　金：山东省优秀中青年科学家科研奖励基金资助项目(BS2010DX031;BS2012DX035);科技部中-白国际科技合作基金资助项目(2010DFR10710)

摘　　要：无线多媒体传感器网络(WMSNs)以满足多媒体数据对网络实时性传输的要求为主要任务,这是制约该技术发展的关键瓶颈之一。针对这一技术需求,提出了可变底数的指数窗口无线信道退避算法,底数实际可调。当无线信道处于空闲状态时,高优先级的多媒体数据将信道竞争窗口直接调到最小,以保持高优先级的信道接入;而低优先级的数据的信道竞争窗口则以幂函数的形式逐步减小,以保持低优先级的信道接入。实验表明:当网络中发送高优先级数据的节点数量等于或者小于发送低优先级数据的节点数量时,网络对高优先级数据的发送时间间隔小于低优先级数据,但当网络节点数量较多时,网络对2种数据的吞吐量的差别不大。The main duty of wireless multimedia sensor networks （WMSNs） is to satisfy requirement of network reahime transmission,which is one of the key bottlenecks constraining its development. Present a variable-based exponential windows wireless channel backoff algorithm, aiming at this technical requirement, and the base can be actually adjusted. The channel competition window is adjusted to the minimum to keep high-priority channel access of high-priority multimedia data when wireless channel is clear, the length of a channel competition window of low- priority data gradually decreases in the form of a power function to keep the low-priority channel access. Experiments show that the sending time interval of high-priority data package is less than that of low-priority data package if the node number of high-priority data package is equal to or less than that of low-priority data package, however, no significant difference exists for network throughput of the two kinds of data package, when the number of nework node is large.

关 键 词：无线多媒体传感网 MAC 无线信道退避 

分 类 号：TN919[电子电信—通信与信息系统] TN915[电子电信—信息与通信工程]