无线Ad hoc网络中基于SWAN模型的QoS改进机制

为提高无状态无线Ad hoc网络模型SWAN的QoS性能,对其接纳控制机制和路由机制分别进行改进。对802.11 DCF协议的饱和吞吐量和流内干扰模型进行了分析,提出一种节点可用带宽和业务流占用带宽的估计方法,以提高接纳控制的准确性;同时,将网络负载信息用于路由发现过程,以获得资源相对充足的传输路径。仿真结果表明:采用上述改进机制的SWAN模型中,实时业务的时延性能显著提高,非实时业务的吞吐量也得到增加。

Improved QoS scheme based on SWAN model in wireless Ad hoc network

To enhance the QoS performance of the stateless wireless Ad hoc network(SWAN) model, its admission control scheme and routing protocol were improved. The saturated throughput of the 802.11 DCF protocal and the intra-flow interference model were analyzed and the estimation methods for the node available bandwidth and the real-time bandwidth consumption were proposed to improve the accuracy of the admission control scheme. Meanwhile, the traffic load imformation of the network was applied in the route discovery to select the more resourceful route for data transmission. The simulation results showed that the proposed schemes significantly improves the delay performance of the real-time traffic and the total throughput of the best effort traffic.