Research On Link Schedule Policy In Clustering Wireless Sensor Networks

Wireless sensor networks are currently world wide concerned, deeply multidisciplinary, and highly knowledge integrated forefront research field. As wireless sensor networks generally consist of massive densely distributed sensor nodes, which are quite constrained in energy, computing ability and bandwidth, traditional wireless communication protocols are not suitable here. Designing communication protocols that can save energy and prolong network lifetime poses big challenge in this research area.This thesis first summarizes the concept, characteristics, architecture, application and research progress of wireless sensor network, and analyzes its energy efficiency performance, describing some important energy efficient strategies. Then communication protocols for clustering sensor networks are investigated, the protocols for routing and MAC layers are emphasized. As a widely accepted clustering protocol, LEACH is further explored for detail.Based on the investigation of communication protocols for clustering wireless sensor network, an energy efficient link schedule scheme is proposed from the perspective of cross layer design. On the basis of dynamic clustering described in LEACH, transmission time slot length computing and channel reuse are considered in the proposed scheme. With the convex optimization theory, the joint optimization problem involving cluster number, transmission time allocation and channel reuse distance is solved. Compared with the radio communication model in LEACH, a more practical SINR based model is in use for computing transmission power. Simulation result in Matlab verifies that the proposed scheme can save energy significantly.