一种无线传感器网络跨层拥塞控制算法

在无线传感器网络中节点级拥塞和链路级拥塞同时发生的情况下,引入滑模变结构机制,提出相应的拥塞控制算法.链路级拥塞采取节点输出流量最小的数据包优先进行传输的原则;节点级拥塞利用主动队列管理方法实现拥塞控制.所设计的控制器实现了MAC层和传输层同时进行拥塞控制的目的,使整个网络中的节点根据局部的拥塞状态调整数据发送速率,同时自适应地分配MAC信道,利用Lyapunov函数证明了算法的有效性.仿真结果表明该算法有效缓解拥塞的发生,大大降低排队时间.

A Cross-Layer Congestion Control Algorithm for Wireless Sensor Network

A congestion control algorithm based on node-congestion and link-congestion was presented with sliding mode variable.Min-data package of node outgoing traffic was preferentially transmitted in the link-congestion;and active queue management method was used for the congestion control of the node level.The controller implements the purpose that congestion control can be simultaneously carried in MAC layer and transport layer.It can adaptively adjust the data sending rate according to the local congestion status of the network nodes,and the MAC channels are adaptively allocated.The validity of the proposed algorithm was proved by the Lyapunov function.Simulation results indicate that the algorithm restrains the congestion in the wireless sensor network,and reduces significantly the queuing time.