多跳延时保障无线传感网MAC协议研究  

Guaranteeing multi-hop latency MAC protocol for wireless sensor networks

作　　者：杨杨 王翔[1] 黄河清[1,2] 王营冠[1] 晰 

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050 [2]无锡物联网产业研究院,江苏无锡214135

出　　处：《华中科技大学学报（自然科学版）》2011年第6期24-29,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家科技重大专项资助项目(2009ZX03006-006);国家重点基础研究发展计划资助项目(2011CB302901)

摘　　要：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.Multi-superframe schedule protocol was proposed to avoid active portion of different devices conflict and decrease network transmission latency in medium access control （MAC） protocol for cluster-tree wireless sensor networks. The collision free superframe allocation of different devices was guaranteed, after multi-superframe schedule was used and the mechanism was designed for beacon slot allocation and conflict notification mechanism. Through increasing active communicate portion and immediately guaranteed time slot （GTS） response scheme, the network transmission latency decreased. Both theoretical analysis and experimental results show that the latency caused by multi-hop transmission has decreased to one forth of former IEEE 802.15.4 standard with acceptable incremental overheads, and the advantage of this enhanced standard protocol is more apparent as the number of hop increased.

关 键 词：无线传感网 媒体接入控制 簇树拓扑 多跳 网络传输延时 IEEE802.15.4标准 

分 类 号：TP393.1[自动化与计算机技术—计算机应用技术]