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实时业务传输的服务质量(QoS)保障问题一直是限制Ad Hoc网络发展的瓶颈.在分布式网络环境下,分组冲突十分普遍,节点很难在限定的时间内成功接入信道.现有很多算法(如FPRP)虽能很好的消除冲突,却需要非常多的控制分组,同样造成过高的接入时延.在研究动态时隙分配类MAC协议的基础上,设计了一种采用渐进式预留机制的MAC协议,协议通过分级预留、协同竞争和空闲时隙的时隙重构来达到分组冲突的充分化解,信道资源的高效利用,以及不同优先级业务的有效接入.仿真表明,与现有时隙类协议相比,新协议可以显著减少分组冲突,提高信道利用率,实现较低的分组接入延迟,并且能够较好的支持数据报业务.
The quality of service (QoS) guarantee of real-time service transmission has always been the bottleneck that restricts the development of Ad Hoc networks.In the distributed network environment, packet collisions are very common and it is very difficult for nodes to access the channel successfully in a limited time.Many algorithms (Such as FPRP) can eliminate collisions well, but it needs a lot of control packets, which also result in too high access delay.On the basis of researching dynamic slot allocation MAC protocol, MAC protocol for reservation mechanism, which achieves sufficient resolution of packet collisions, efficient utilization of channel resources and efficient access of different priority services through hierarchical reservation, cooperative competition and slot reconstruction of idle time slots. Simulation shows , Compared with the existing slot class protocol, the new protocol can significantly reduce packet collision, improve channel utilization, achieve lower packet access delay, and can better support datagram service.