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一种实用的传感器网络拥塞控制算法


□ 王艳妹 覃少华 黄勇萍 曹 健

  摘 要:传感器网络的拥塞不仅导致丢包率增加,影响传输性能,还浪费宝贵的能量资源,因此,有效控制拥塞是传感器网络中需要解决的一个关键问题。提出了一种拥塞控制机制(CMCS)。与现有工作不同,CMCS采用基于节点的缓存队列长度并结合拥塞增长系数来判断拥塞的变化趋势,以拥塞节点为中心的共享信道区域内进行拥塞反馈和速率控制,并采用基于剩余价值的丢包策略。仿真结果表明,CMCS明显降低了通信能耗,提高了网络的价值吞吐量。
  关键词:传感器网络; 拥塞控制; 拥塞增长系数; 带宽分配; 缓存增长空间
  中图分类号:TP391文献标志码:A
  文章编号:1001-3695(2009)06-2238-03
  doi:10.3969/j.issn.1001-3695.2009.06.072
  
  Practical congestion control algorithm for sensor networks
  WANG Yan-mei, QIN Shao-hua, HUANG Yong-ping, CAO Jian
  (School of Computer Science & Information Engineering, Guangxi Normal University, Guilin Guangxi 541004, China)
  Abstract:
  Congestion in sensor networks not only causes packet loss, but also leads to excessive energy consumption. Therefore congestion needs to be controlled in order to prolong system lifetime. This paper proposed a congestion control mechanism based on congestion state for sensor network (CMCS). Unlike existing work, CMCS innovatively measured congestion degree based on queue length and congestion increasing coefficient in intermediate nodes. CMCS utilized a bandwidth allocation strategy based on buffer increasing space and imposed a packet-discarding scheme based on packet surplus value to control congestion. The result of experiment shows that CMCS achieves efficient congestion control, as a result, it leads to higher energy efficiency and better QoS in terms of both packet loss rate and network value throughput. ......
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