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中文摘要：
基于随机竞争和冲突解决的思想,本文为多跳移动Ad Hoc网络提出了一种分布式服务质量（QoS）保证的多址接入（QMA）协议.该协议中,节点在发送业务分组前利用预报突发进行竞争接入,节点根据业务分组时延情况和最早失效优先原则确定预报突发的长度,所发预报突发能持续到最后的节点优先获得接入.同时,具有实时业务的节点可以按照其优先级在更早的竞争微时隙中开始发送预报突发,而有非实时业务的节点只能在前面竞争微时隙空闲的情况下,才能在后面的微时隙开始发送预报突发,因此发送实时业务的节点可以比发送非实时业务的节点更优先接入信道,从而在移动Ad Hoc网络中实现了对多媒体业务的QoS保证.最后利用OPNET仿真评估了QMA协议的多址性能,并与IEEE 802.11e协议的性能做了比较,结果表明QMA协议可以提供较高的吞吐量和较低的实时业务时延.
英文摘要：
Based on the concept of random contention and collision resolution,a distributed quality-of-service-guaranteed multiple access（QMA）protocol for ad hoc networks is proposed to support multimedia service and multi-hop architecture.In the protocol,nodes broadcast forecast bursts（FBs）to access channel resources before their packets transmissions based on their recent packet delay and the earliest deadline first（EDF）principle,and the one that broadcasts the most FBs gets fight to use the channel. Meanwhile,the nodes with real-time traffic can access channel prior to those with non real-time traffic by broadcasting FBs from earlier FB mini-slots,while the nodes with non real-time traffic are allowed to start to broadcast FBs on condition that all the former FB mini-slots for real-time traffic are idle.Therefore,the proposed protocol can provide QoS guarantees for multimedia traffic in mobile ad hoc networks.Finally,by the means of simulations in OPNET modeler,it is shown that the QMA protocol outperforms the IEEE 802.lle protocol in terms of throughput and average packet delay,especially for real-time traffic.
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