无线多媒体传感器网络自适应拥塞控制算法

An Adaptive Congestion Control Protocol for Wireless Multimedia Sensor Network

针对无线多媒体传感器网络(WMSN)中多对一通信时产生的网络拥塞问题,提出了一种自适应的WSMN网络拥塞控制算法ACCP。通过结合速率控制和资源调度,并采用分簇的网络结构,根据簇首及簇内的拥塞指标,来分别启动对应的拥塞控制机制:当簇首发生短时间拥塞时,就启动属于资源调度的网络内存储管理机制,来暂时减缓网络内过多数据包;但当簇中的存储节点也无法容纳过量的数据包时,速率控制就启动,让流量减缓下来,并且只调整数据实时性要求较低的数据流的速率,以达到控制流量、减缓甚至消除网络拥塞的目的。仿真结果显示:ACCP在传送速率不同下,可以比InS、HCCP更有效的控制网络拥塞的情况,而在比较缓存容量不同的情况下,虽然ACCP只比HCCP能够稍微改善网络拥塞的情况,但却能够大幅度改善InS的数据包丢失率。

Network congestion produced by many to this paper, an adaptive congestion control protocol one communication is （ACCP） is presented. a crucial problem in WMSN. In Through the combination of rate control and resource scheduling, the cluster-base structure is used to start the corresponding congestion control mechanism according to the cluster head and its congestion index. When the cluster head is congested for a short time, the network memory management mechanism belonging to resource scheduling will start to suspend too much packets in the network. When the storage node is unable to accommodate excessive packets, the rate control will start to slow down the network traffic. The simulation results show that the ACCP is more effective than InS, HCCP in controlling the network congestion in the case of transfer rate changing. Though the ACCP can only improve network congestion just a little better than HCCP under the condition of cache capacity changing, the packet loss of InS is improved significantly.