MAC(media access control)协议是低压电力线通信(lowvoltage power line communications,LPLC)网络的重要基础之一.当前基于LPLC的用电信息采集系统通信所使用的MAC协议主要为CSMA/CA(carrier sense multiple access with collision avoidance).但是在周期性用电数据采集型LPLC网络中,CSMA/CA易导致信道竞争频繁影响网络的通信效率.针对该问题,提出了一种基于分簇和概率函数的MAC(cluster and probability-function based MAC,CP-MAC)机制,该机制采用分簇的方式并引入概率函数的方式决定信道争用,以有效抑制节点间的信道竞争和通信冲突.仿真分析表明,CP-MAC机制能有效地降低节点间通信冲突并提高通信效率
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