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针对设计多级簇树拓扑结构的无线传感网MAC协议时,存在不同层级设备之间交互时段冲突和网络多跳转发延时过大的问题,提出一种组合超帧调度协议.通过构建基于超帧单元的组合调度超帧及设计信标时隙分配与冲突解决机制,保证多级设备交互时段的无冲突协调分配;通过增加各级设备在调度周期中的交互时段和设计保障时隙及时预约机制,减少多跳传输带来的网络传输延时.理论分析和仿真结果均表明:在增加可接受的能耗开销前提下,提出的MAC协议的多跳传输延时能降低至IEEE 802.15.4标准MAC规范的1/4以下,并且随着跳数的增加,传输延时的降低效果更为明显.
Aimed at the design of multi-level cluster tree topology for wireless sensor network (MAC) protocol, this paper presents the problem of different periods of equipment collision and excessive multi-hop forwarding delay, and proposes a combined super-frame scheduling protocol. Based on the combination of super-frame unit super-frame scheduling and design of beacon slot allocation and conflict resolution mechanism to ensure non-collision coordinated allocation of multi-level device interaction period; by increasing the level of equipment in the scheduling cycle of interaction and design of security slots Time reservation mechanism to reduce the network transmission delay caused by multi-hop transmission.The theoretical analysis and simulation results show that under the precondition of increasing the acceptable energy consumption overhead, the proposed multi-hop transmission delay of MAC protocol can be reduced to IEEE 802.15 .4 standard 1/4 of the MAC specification, and with the hop count increases, the transmission delay reduction effect is more obvious.