摘要
针对无线传感器网络(WSN)的拥塞问题,本文提出了一种WSN的拥塞避免机制API_DR.该机制将中间节点和源端相结合,中间节点引入自适应PI主动队列管理算法,以适应WSN的动态环境;源端采用区分丢包的速率调节策略,综合当前拥塞状况和WSN高误码特性调节发送速率,避免源端误启动拥塞控制机制带来的能量消耗和吞吐量的降低.NS2仿真表明,API_DR既能较好地控制队列长度,提高吞吐量和降低丢包率,又能有效地避免拥塞,使源节点发送速率相对稳定.
Aiming to the congestion problem in wireless sensor network （WSN）, a congestion avoidance scheme APIDR is presented, combining intermediate node and source side. On one hand, we design an adaptive active queue management using PI control on intermediate node, which can achieve PI parameters＇ on-line self-adaptive. On the other hand, we adopt a strategy of rate adjustment based on loss differentiation on source side, comprehensively considering the congestion situation of current network and the influences of packet lost by link corruption to regulate the sender＇s packet sending rate, in order to avoid the waste energy and reduce of throughput brought by mistake start-up of congestion control scheme. The result of simulation shows that API_DR can converge to queue size-setting value rapidly, get higher network throughput and lesser packets loss rate, meanwhile, congestion can be avoided effectively and sender＇s packet sending rate could keep stable by this way.
出处
《小型微型计算机系统》
CSCD
北大核心
2013年第4期760-763,共4页
Journal of Chinese Computer Systems
关键词
无线传感器网络
主动队列管理
拥塞避免
NS2
wireless sensor network
active queue management
congestion avoidance
NS2
