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针对在使用方向性天线的AdHoc网络中没有合理利用远距离传输优势的问题,提出了一种支持远距离通信的方向性MAC协议.在该方向性MAC协议中,中间节点会利用一种远距离定向算法帮助发送节点获取位于两跳远的目的节点的定向信息从而建立远距离链路,这种链路的建立有助于解决局部拥塞,同时降低传输延时.本文中根据MAC层能否获得信号接收功率信息提出了两种LRO算法:基本LRO算法不使用信号接收功率信息,仅利用几何关系获得近似的远距离节点定向信息;而LRO-PI(LRO with power in for mation)算法在利用信号接收功率信息后可以进行更加准确的远距离节点定向.性能分析表明,在合理地选择相关参数后,LRO算法有着很高的定位准确性.并且仿真结果表明远距离链路的建立可以有效地提高网络的吞吐量,并且降低端到端延时.
Aiming at the problem that the advantage of long distance transmission is not utilized reasonably in AdHoc networks that use directional antennas, a directional MAC protocol supporting long distance communication is proposed. In this directional MAC protocol, intermediate nodes use a long distance The directional algorithm helps the sending node to obtain the directional information of the destination node located at two-hop far to establish the long-distance link, and this link establishment helps to solve the local congestion and reduce the transmission delay.In this paper, Two types of LRO algorithms are proposed for receiving power information: the basic LRO algorithm does not use the signal received power information and only uses the geometric relation to obtain approximate long-distance node orientation information; and the LRO with power in mation algorithm uses the signal receiving The power information can be used to carry out more accurate long-distance node orientation.The performance analysis shows that the LRO algorithm has a high positioning accuracy when the relevant parameters are reasonably selected, and the simulation results show that the establishment of the long-distance link can effectively improve the network Throughput, and reduce end-to-end latency.