无线传感器网络中MAC层超帧重设计  

MAC Layer Superframe Redesigning in Wireless Sensor Network

作　　者：何璇[1] 赵海[1] 朱剑[1] 李大舟[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2012年第6期810-814,共5页Journal of Northeastern University(Natural Science)

基　　金：教育部高等学校科技创新工程重大项目培育资金资助项目(708026)

摘　　要：由于无线传感器网络节点能量十分有限,使各节点相对公平地使用信道可以延长网络寿命.在理论分析的基础上,针对现有超帧结构设计的不足,对IEEE 802.15.4的超帧结构进行重新设计,引入分区竞争和分时调度以减少节点产生竞争冲突的概率,并针对分区竞争阶段提出了表征竞争公平程度的特征参数.实验表明提出的方法有效地解决了传统CSMA/CA机制下信道争用不公平的问题,减小了节点最大退避次数和缓存占用率,平衡了整个网络的能量分布,从而延长了网络寿命.Due to the energy of WSN node is so limited,sharing the channel fairly for every node can extend network life.On the basis of theoretical analysis,the structure of IEEE 802.15.4 superframe was redesigned for lack of the current superframe.In order to reduce the conflicting probability among nodes,sub-area competition and slotted scheduling were involved,and feature parameters to measure the network fairness index were put forward.Experimental results indicated that the proposed method effectively solved the problem of unfair channel contention under traditional CSMA/CA mechanism and reduced the max backoff times and cache occupancy rate,which balanced the distribution of network energy to extend the network life.

关 键 词：无线传感器网络 保障时隙机制 超帧 分区竞争 公平性 

分 类 号：TP393.17[自动化与计算机技术—计算机应用技术]