基于传输距离和Sink移动的扩延网络寿命算法

Network lifetime augmentation algorithm based on transmission range and Sink mobility

在无线传感网络WSN(Wireless Sensor Network)中,传感节点通常以多跳方式向信宿Sink传输感测数据。由于邻近信宿Sink的传感节点需要承担数据转发的任务,比其他节点消耗更多的能量,缩短了网络寿命。为此,提出一种扩延网络寿命的新算法,记为NLTA(Network Life Time Augmentation)。NLTA算法采用了节点传输距离自适应调整和信宿Sink移动两个策略。节点依据能量情况,调整传输距离,减少能量消耗,然后根据路径容量值,调整Sink的位置,平衡网内的节点能量消耗,避免信宿Sink的周围节点能量过度消耗。仿真结果表明,提出的NLTA方案能够有效地提高网络寿命。

In Wireless Sensor Network （WSN）, each sensor node delivers the sensed data to sink by multi-hopping technique. Generally, sensor nodes nearer to the sink will consume more battery power than further nodes. So there nodes will drain out their battery power rapidly and reduce the network lifetime. In this paper, a network lifetime augmentation algorithm for WSN is pro- posed, which is marked as NLTA. NLTA algorithm has used adaptive transmission range of sensor node and sink relocation mecha- nism. The transmission range adjusting depends on the residual battery energy of a sensor node, then the sink will relocate to the new position by the capacity path. Finally, numerical simulation verifies the performance of NLTA algorithm. Simulation results show that NLTA algorithm can prolong network lifetime.