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针对Ad Hoc网络的节点具有移动性,信道具有多跳共享性的特点,提出动态时隙分配的混合媒体接入控制(media access control,MAC)协议,协议包括时隙分配和时隙竞争2个阶段。在时隙分配阶段,采用静态分配和动态调整相结合的方式,在为每个节点分配固有时隙的基础上,将不共享信道的节点时隙动态地分配给通信节点;在时隙竞争阶段,通过在子帧中设置不同优先级,在不参与通信节点的主时隙中,数据传输子帧被分成实时业务竞争阶段和非实时业务竞争阶段,竞争成功的节点在这个时隙传输数据,提高优先业务节点的接入概率。采用NS2网络模拟软件进行仿真,结果表明,所提混合MAC协议提高了系统的分组投递率,降低了实时业务的平均时延,协议能够充分利用信道空间复用性,减少竞争,提高接入效率,适合Ad Hoc网络。
The nodes of Ad Hoc network have the characteristics of mobility and multi-hop shared channel, and propose a hybrid media access control (MAC) protocol for dynamic slot allocation. The protocols include slot allocation and slot competition stage. In the time slot allocation phase, the static time slot allocation is dynamically allocated to the communication node on the basis of assigning a natural time slot to each node. In the slot competition phase By setting different priorities in the subframes, the data transmission subframes are divided into a real-time service contention phase and a non-real-time traffic contention phase in the main slots that do not participate in the communication node. The successfully competing nodes transmit data in this time slot, Increase the probability of access to priority service nodes. The simulation results using NS2 network simulation software show that the proposed hybrid MAC protocol improves the packet delivery rate of the system and reduces the average delay of real-time services. The protocol can make full use of channel space reuse, reduce competition and improve access efficiency , Suitable for Ad Hoc network.