无线传感器网络节点实时流量负载的时隙调度算法

A TIME-SLOT SCHEDULING ALGORITHM FOR NODE REAL-TIME TRAFFIC LOAD IN WIRELESS SENSOR NETWORKS

目前无线传感器网络基于TDMA的MAC协议基本考虑节点处于连续工作而忽略事件驱动状态,没有考虑到复杂多变的网络环境,造成节点能量过度的浪费。提出了一种根据节点实时流量负载的时隙调度算法(TART),TART算法基于簇结构,采用分布式与集中式相结合的方式,成员节点实时向簇首发送自己数据流量信息,由簇头动态调节簇内节点时隙更新频率和顺序,降低时隙划分的能量和时间代价,减少节点的空闲侦听时间。仿真表明,算法有效地提高了网络能量有效性,延长了网络生存周期,降低数据包的延时。

At present,the TDMA based MAC protocol of wireless sensor network mainly focuses on continuous working of nodes but neglects the event driven conditions, and does not consider the complicated and diversified network environment, these have caused the excessive waste of node energy. We proposed a time-slot scheduling algorithm based on nodes＇real-time conditions （TART） for Wireless Sensor Networks ,TART is based on cluster structure, unifies the distributional and the central merits. In this algorithm, member nodes timely transmit their own data traffic information to the cluster head, and the cluster head dynamically adjusts the time - slot of nodes inside the cluster and updates the order and frequency, thus the energy of partitioning time slot and the time consumption was scaled down, and the idle listening was reduced as well. Simulation results show that the algorithm has efficiently improved the network energy effectiveness and prolonged networks life cycle, as well as reduced the data packet time delay.