Abstract: Proportional Integral(PI) algorithm in Active Queue Management(AQM) can control the queue size of bottleneck nodes in Ad hoc network effectively, and stability of the algorithm is the base of congestion control. Now the designs of PI-AQM always lack theoretic analysis of stable region. This paper analyzes stability characteristic of PI-AQM in wireless and delay Ad hoc network because of the multi-hop and large-delay, and gives stable regions of PI-AQM controllers in delay and non-delay networks to improve PI controllers. Matlab and NS2 simulations validate the conclusion.

Key words: Ad hoc network, delay, Proportional Integral(PI), stable region

摘要： 主动队列管理(AQM)的比例积分(PI)算法可以有效控制Ad hoc网络的瓶颈节点队列长度，其稳定性是实现拥塞控制的基础。针对目前PI-AQM设计大多缺乏稳定区域的理论分析问题，该文根据Ad hoc网络的多跳、时延特点，分析PI算法在时延无线网络中的稳定性，给出无时延和大时延下PI算法的稳定区域，以便进一步优化设计PI控制器。通过Matlab和NS2仿真验证了稳定区域结论的正确性。

关键词: Ad hoc网络, 时延, 比例积分, 稳定区域

CLC Number: 

• TP393