关键词: 无线传感器网络, MAC协议, 分簇, 时隙

Abstract:

In order to reduce the average energy consumption of large scale wireless sensor networks, a scheduling based MAC protocol with dynamic time slot allocation (SDC-MAC) is presented for clustered wireless sensor networks. Among different clusters, the wireless channel is allocated with FDMA, and time slots with variable length are allocated to each node in clusters. With the change of cluster structure in the network, cluster heads dynamic adjust the length of time slots by means of time slot allocation notification, and the cluster members decide to sleep or wake according to control signals. Simulation results show that with the proposed algorithm, average energy consumption of the networks is effectively reduced, and the average packet delay is decreased when the network data flow is high.

Key words: wireless sensor networks;MAC protocol;clustering, time slot