The model of energy cost in a wireless sensor network （WSN）environment is built, and the energy awareness and the wireless interference mainly due to different path loss models are studied. A special case of a clust...
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The model of energy cost in a wireless sensor network （WSN）environment is built, and the energy awareness and the wireless interference mainly due to different path loss models are studied. A special case of a clustering scheme, a twodimensional grid clustering mechanism, is adopted. Clusterheads are rotated evenly among all sensor nodes in an efficient and decentralized manner, based on the residual energy in the battery and the random backoff time. In addition to transmitting and receiving packets within the sensors＇ electrical and amplification circuits, extra energy is needed in the retransmission of packets due to packet collisions caused by severe interference. By analysis and mathematical derivation, which are based on planar geometry, it is shown that the total energy consumed in the network is directly related to the gridstructure in the proposed grid based clustering mechanism. The transmission range is determined by cluster size, and the path loss exponent is determined by nodal separation. The summation of overall interference is caused by all the sensors that are transmitting concurrently. By analysis and simulation, an optimal grid structure with the corresponding grid size is presented, which balances between maximizing energy conservation and minimizing overall interference in wireless sensor networks.
以优化的链路状态路由(optimized link state routing,OLSR)协议为原型,为无线Mesh网设计了一种基于节点区分和跨层设计的优化链路状态路由协议NDCL-OLSR(node-differentia-tion and cross-layer based optimized link state routing)....
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以优化的链路状态路由(optimized link state routing,OLSR)协议为原型,为无线Mesh网设计了一种基于节点区分和跨层设计的优化链路状态路由协议NDCL-OLSR(node-differentia-tion and cross-layer based optimized link state routing).该协议采用了一种新的路由判据NDCLM(node-differentiation and cross-layer metric),在路由计算过程中通过跨层操作机制综合考虑了节点当前负载和链路投递率2个因素对链路质量的影响,并且对节点的类型进行了区分,使得网络流量尽量绕开业务繁忙的超网关节点(SGW),从而大大优化了路由选择的效果.仿真结果表明,NDCL-OLSR能够从很大程度上提高网络的吞吐量,降低端到端的延时,并且能够达到负载均衡的路由效果.
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