采用渐进式预留机制的Ad Hoc网络MAC协议

MAC Protocol Used Progressive Reservation Mechanism for Ad Hoc Networks

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.

Guarantee to QoS for real-time traffic is the bottleneck to Ad Hoc Networks＇ development. In distributed Network, packet contention is so much that nodes always failed to access channel in limited time. Though there are many protocol, for example FPRP, which could eliminate collision remarkable, while they usually need a great quantity of control packets, which lead to high access de- lay also. By studying dynamical slot-distribution MAC protocol, a protocol used progressive reservation mechanism for Ad hoc Net- works was lay out, named PR-MAC. In the new protocol, nodes access channel by gradation, coordinated competition, also the idle data slot is reconstructed to resolve the confliction. Therefore, PR-MAC possess the merit of high utilization of resources, few data- packets collision and low access delay, in addition, it can support data traffic fine.