无线Ad Hoc网络MAC层中针对FD中继的高效空间复用机制  

Efficient spatial reuse mechanism for FD relay in MAC layer of wireless Ad Hoc networks

作　　者：宋宇 齐望东 赵卫伟 Song Yu;Qi Wangdong;Zhao Weiwei(Institute of Command and Control Engineering,PLA Army Engineering University,Nanjing 210007,China;The Experimental Training Base,National University of Defense Technology,Xi′an 710106,China)

机构地区：[1]陆军工程大学指挥控制工程学院,江苏南京210007 [2]国防科技大学试验训练基地,陕西西安710106

出　　处：《信息技术与网络安全》2018年第11期79-83,共5页Information Technology and Network Security

摘　　要：随着自干扰(Self-Interference,SI)消除技术的进步,无线节点可以实现全双工(Full-Duplex,FD)通信。如果要求无线网络中的两跳路径采用FD中继节点,则其端到端的吞吐率可以得到提升。但是,FD节点也带来了新的干扰样式,需要在媒体访问控制(Media Access Control,MAC)层设计新的机制。FD中继节点可以向发送端发送补充信号以避免隐蔽终端问题,也可以直接将从发送端接收的信号转发给接收端。为了减小两个发送端发送信号占用的空间大小,分别建模和求解在这两种FD通信模式下它们发送功率的优化模型。随后,以单位面积的吞吐率为测度,判定节点采用的FD模式。仿真结果表明,在两种FD通信模式下对应两个发送端的发送功率和占用空间大小均有大幅降低。并且,根据节点SI系数,以及它与发送端和接收端之间的距离不同,中继节点的两种FD模式需要灵活选取以最大化单位面积的吞吐率。With the progress in self-interference （SI） cancellation techniques,wireless nodes can simultaneously transmit and receive using the same frequency band.For a two-hop path in a wireless network,if the relay node is required to operate in FD mode,its end-to-end throughput can be increased.But the FD node also brings new interference patterns.Designing a new mechanism in the media access control （MAC） layer is necessary.The FD relay node can send supplementary signals to the sender to avoid hidden terminal problems,or it can directly forward the received signals from the sender to the receiver.For these two typical FD modes,in order to reduce the space occupied by the sending signals of the two senders,we model （solve） their transmit power optimization model.Then,we take the throughput per unit area as the metric and determine the FD mode adopted by the relay node.The simulation results show that the transmit power and the occupied space of the two senders are greatly reduced when the FD relay node works in the both two modes.Furthermore,two FD modes of relay nodes need to be selected flexibly to maximize throughput per unit area,depending on the SI coefficient of the node and the distance between it and the sender （receiver）.

关 键 词：无线AD HOC网络 MAC层机制 全双工节点 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]