移动Ad Hoc网络自相似业务排队性能分析

对实际网络业务大量的测量表明,网络中的业务量存在着自相似特性,移动Ad Hoc网络中的业务同样具有该特性.目前对于移动Ad Hoc网络方面的研究只限于实测和简单的定性分析.采用更接近实际情况的队列长度有限G/D/1排队模型对移动Ad Hoc网络性能进行了分析和仿真,结果表明自相似业务导致排队性能变差,缓存匮乏,时延和分组丢失概率恶化.为此提出了基于网络规划模型的适用于自相似业务的路由算法.该算法利用多路径备份路由,当链路失效时可以迅速地寻找到新的替代路由,减小缓存中排队时延和丢包率,并对网络的发射功率进行优化提高信道空间的复用度.仿真结果表明,该算法可以改善分组丢失概率,提高网络吞吐量,降低时延.

Queuing performance analysis of self-similar traffic in mobile Ad Hoc networks

Measurements of data traffic in real networks show that there is self-similarity in traffic in these networks. The same situation is found in the multi-hop mobile Ad Hoc network. At present, research work related to MANET is limited to qualitative analysis. This paper presents a G/D/1 queuing model to analyze and simulate the qt performance of a mobile Ad Hoc network. Simulation results show that self-similar traffic leads to deterioration of queuing performance and delay in mobile Ad Hoc networks. This paper proposes a routing algorithm based on a programming model for self-similar traffic in mobile Ad Hoc networks which employs muhipath backup routing to reduce delaying and packet loss rates. Simulation results show that the new algorithm can increase the throughput of a network and improve the success ratio of packet delivery and decrease delays.