一种高效低时延的宽带电力线通信网多跳MAC协议

针对IEEE1901.1宽带电力线通信媒体接入控制(Medium Access Control,MAC)协议涉及到信标时隙利用不充分和控制开销过大等问题,提出了一种高效低时延的宽带电力线通信网多跳MAC协议(Efficient and Low Delay Multi-hop MAC,ELDM-MAC).采用基于节点层级号的信标时隙分配机制,根据邻居表和时隙分配信息计算能够提前进入到载波监听多路访问时隙(Carrier Sense Multiple Access,CSMA)的时间,减少了信标时隙的浪费,提高了信道利用率;同时采用基于拓扑信息的信标帧高效广播机制,删除不大于自身层级号的节点和大于且在两跳范围内的非子孙节点的时隙分配信息,降低了网络控制开销.仿真结果表明,ELDM-MAC协议在信道利用率、平均时延和控制开销等方面都优于IEEE1901.1 MAC协议,更适用于宽带电力线通信网络的实际应用场景.

An efficient and low delay multi-hop MAC protocol for broadband power line communication networks

For the problems of IEEE1901.1 broadband power line communication(BPLC) media access control(MAC) protocol,such as insufficient beacon timeslot utilization and excessive control overhead,this paper proposes an efficient and low delay multi hop MAC(ELDM MAC) protocol for BPLC networks.The beacon timeslot allocation mechanism based on node layer number is adopted,according to neighbor table and timeslot allocation information,the time when CSMA timeslot can be entered in advance can be calculated,which reduces the waste of beacon timeslot and improves the channel utilization.At the same time,the efficient broadcast mechanism of beacon frame based on topology information is used,the main idea is to delete the timeslot allocation information of nodes whose layer number is not greater than itself and the timeslot allocation information of non descendant nodes whose layer number is greater than itself within two hops,which ultimately reduces the network control overhead.The simulation results show that ELDM MAC protocol proposed performs better than IEEE1901.1 MAC protocol in channel utilization,average delay and control overhead,which can be preferably applied in practical scenarios of BPLC networks.