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文中首先针对基于IEEE802.11协议的多跳无线网络,建立了一个更完整、实用的分析模型.相对于以往的工作,该模型具有3个突出特点:(i)它从物理层和MAC层上考虑了多跳无线网络中更真实的情况,包括节点周围的干扰、隐藏节点问题、捕获效应、真实的信道环境、非饱和节点以及多速率发送等,从而使得基于该模型的分析结果更准确;(ii)它将网络中业务的带宽需求映射到了模型的参数中,从而可以方便地对带宽敏感业务进行建模分析;(iii)它可以预测性地分析当某一特定带宽的业务进入网络后网络性能的表现.然后,基于该模型提出和验证了端到端可用带宽预测的迭代算法.该算法可以预测新业务进入网络后,一些对可用带宽估计起关键作用的网络参数的变化,因而可以获得更准确的可用带宽信息.该迭代算法收敛速度快且易于实现,具有很好的应用前景.
In this paper, a more complete and practical analysis model for multi-hop wireless network based on IEEE802.11 protocol is established firstly, which has three prominent features compared with the previous work: (i) It is from the physical layer and the MAC layer Considering the more realistic situation of multi-hop wireless networks, including the interference around the nodes, the hidden node problem, the capture effect, the real channel environment, the non-saturated nodes and multi-rate transmission, the analysis results based on the model are more accurate. (ii) it maps the bandwidth requirements of the business in the network to the parameters of the model so that it can be easily modeled and analyzed for bandwidth-sensitive services; and (iii) it predictively analyzes when a particular bandwidth of traffic enters the network Network performance.Then, an iterative algorithm based on this model is proposed and validated to predict the end-to-end available bandwidth.The algorithm can predict the change of some network parameters that play a key role in estimating the available bandwidth after the new service enters the network, Get more accurate available bandwidth information.The convergence rate of the iterative algorithm is fast and easy to implement, and has good application prospects.