基于期望寿命的能量均衡RPL研究

ENERGY BALANCE RPL BASED ON EXPECTED LIFE TIME

目前基于能量均衡的低功耗有损网络路由协议RPL(Routing Protocol for Lowpower and lossy networks)在网络拓扑构建的过程中由于未考虑备选父节点上一跳节点的期望寿命,从而导致所构建的网络不能较好地实现能量均衡的问题。对此提出一种基于期望寿命的能量均衡RPL(Expected Life Time-based Energy Balance RPL,ELT-EB-RPL)。构造一种复合路由判据,包括传输跳数、期望传输次数和节点期望寿命,同时,节点在选择最优父节点时需综合考虑其备选父节点及备选父节点上一跳节点的期望寿命。在不增加额外控制开销的前提下,提出一种“节点间期望寿命信息通告”策略,以便节点作出正确的路由选择。通过仿真实验对该方案的性能进行了对比分析。结果表明,在不同发包速率下该方案能够有效实现能量均衡和延长网络寿命。

At present,in the process of network topology construction,routing protocol for low power and lossy networks(RPL)based on energy balance does not take into account the expected life time of one-hop node on the alternative parent node,which results in that the network cannot achieve better energy balance.To solve this problem,this paper proposed an energy balance RPL based on expected life time(ELT-EB-RPL).We constructed a composite routing criterion,including the transmission hops,the expected transmission count and the expected life time of the node.When selecting the optimal parent node,the expected life time of the alternative parent node and the hopping of the alternative parent node should be considered comprehensively.Without additional control overhead,we proposed a strategy of information notification of expected life between nodes to enable nodes to make correct routing choices.The performance of the scheme was compared and analyzed through simulation experiments.Simulation results show that the scheme can effectively achieve energy balance and prolong the network survival time under different delivery rates.