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文章提出一种新的无线传感器网络MAC协议AMAC。AMAC是对S-MAC的扩展,克服了S-MAC采用固定竞争窗,无法适应网络负载变化的缺点。为不影响协议休眠激活周期的建立,文章提出固定竞争窗加p坚持的退避算法,当退避计数器减为零时,节点不是立即发送数据,而是以最优概率p发送。为确定p值,又推导出使平均发送能耗最小的p与活动节点数的关系,同时提出了活动节点数估计算法。最后通过仿真验证了AMAC协议的自适应性和能量有效性。
This paper presents a new wireless sensor network MAC protocol AMAC. AMAC is an extension of S-MAC, which overcomes the shortcomings that S-MAC adopts fixed contention window and can not adapt to the change of network load. In order not to affect the establishment of the dormant activation period of the protocol, the paper proposes a back-off algorithm with a fixed contention window plus p. When the back-off counter is reduced to zero, the node sends the message not immediately, but at the optimal probability p. In order to determine the p value, we deduce the relationship between the p and the active nodes that minimize the average transmission energy consumption. At the same time, we propose an algorithm for estimating the number of active nodes. Finally, the simulation proves the adaptability and energy efficiency of the AMAC protocol.