基于功率控制和冲突避免的无线Mesh网络低能耗MAC协议

Energy efficient MAC protocol with power control and collision avoidance for wireless mesh network

为了解决IEEE 802.11协议在无线Mesh网络中能量利用效率低的问题,提出一种改进的低能耗MAC协议PCCA。PCCA协议在IEEE 802.11协议的基础上加入两个核心算法,即动态功率控制算法(DPCA)和冲突避免算法(CAA),以此降低能耗。DPCA通过接收节点计算发送节点所需的最佳发射功率,降低数据发送的能耗;CAA利用邻居通信状态表对潜在的冲突进行判断,让可能引起冲突的节点进入休眠以节约能量。仿真结果表明PCCA协议最多可降低约20%的能耗。

In order to improve the low energy utilization efficiency of IEEE 802.11 in wireless mesh network,a modified low energy consumption MAC protocol,Power Control and Collision Avoidance（PCCA） was proposed.Two core algorithms — Dynamic Power Control Algorithm（DPCA） and Collision Avoidance Algorithm（CAA） were introduced into IEEE 802.11 to reduce energy consumption.DPCA can reduce energy transmission consumption by carefully computing the best transmission power through information collected at receiving node;CAA can make advantage of neighborhoods＇ communication states table to make the potential collisions nodes into sleep state to save energy.The simulation experiment shows that,the PCCA protocol can save about 20% transmission energy at most.