Abstract: In order to solve the energy limitation problem on wireless sensor network nodes, this paper proposed a new adaptive update asynchronous MAC protocol — AU-MAC protocol. This protocol combined the sleep-work state switching mode, asynchronous mode with adaptive update to effectively extend the network life. AU-MAC protocol improved channel usage efficiency by making use of sender monitoring and receiver activating data transfer. And, it established a neighbor node information table and introduced adaptive updating mechanism, to reduce the free monitor. The functions of AU-MAC protocol had been estimated on NS2 network simulation platform. It shows that, AU-MAC protocol improves the energy efficiency at the basis of maintaining the same throughput and end-end transit delay.

Key words: wireless senor networks, media access control(MAC), asynchronous, passive, adaptive update MAC

摘要： 针对无线传感器网络节点能量受限问题，提出了一种新的自适应更新异步MAC协议——AU-MAC协议。该协议以睡眠与工作状态切换、异步方式和自适应更新相结合的办法有效延长了网络寿命，减少了节点能耗。AU-MAC协议通过采用发方监听、接方激活数据传输，提高了信道利用的有效性。并且，它以建立邻居节点信息表，引入自适应更新机制，来减少空闲监听。在NS2网络仿真平台对提出的AU-MAC协议的性能进行了仿真评估。仿真结果表明，AU-MAC协议在保持相当的吞吐量以及端—端延迟的基础上，使无线传感器网络的能量有效性得到了改善。

关键词: 无线传感网络, 媒体接入控制协议, 异步, 被动, 自适应更新