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一种基于节点重要性和空间相关性的无线传感器网络MAC协议刘放彩 周四望 李 兰


摘 要:提出了一种新的基于节点重要性和空间相关性的MAC协议(NISC-MAC),该协议将数据相关性小的节点,即数据差异大的节点定义为重要节点,并赋予其高的优先权。优先权高的节点发送数据的概率大,退避时间短,从而能优先地竞争到信道。把这些重要性节点选定为代表性节点,确保这些重要的数据发送到sink节点,这样可保证数据的整体有效性,使收到的数据能更好地反映出物理现象。NISC-MAC协议在去除数据空间相关性的同时确保了数据的整体有效性,仿真实验表明此协议在较低的能耗和传输延时下确保了数据的整体有效性。
  关键词:无线传感器网络; 媒体访问控制协议; 空间相关性; 节点重要性
  中图分类号:TP393
  文献标志码:A
  
  文章编号:1001-3695(2010)02-0664-04
  doi:10.3969/j.issn.1001-3695.2010.02.072
  
  Node importance and spatial correlation-based MAC in WSN
  
  LIU Fang-cai, ZHOU Si-wang, LI Lan
  
  (College of Software, Hunan University, Changsha 410082, China)
  
  Abstract:This paper proposed a new node importance and spatial correlation-based MAC protocol(NISC-MAC), which defined the smaller nodes interrelated, i.e., the nodes with great data difference, as the important nodes, and attributed it high priority. Those high priority nodes could send data with highly probability and backoff time shortly so that it was given highly priority in the competition to channel. And they could choose out the important nodes as the representative nodes, made sure those vital data send successfully to the sink node. This would ensure the overall effectiveness of data,made the data received reflect the real physical phenomenon. NISC-MAC is not onlyremoval of spatial correlation of data, but also to ensure the overall effectiveness of data; the simulation experiment indicates the protocol ensure the overall effectiveness of data under low energy consumption and transmission delay. ......
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