基于新型机会频谱接入的网络MAC协议研究

Research of Network MAC Protocol Based on New Opportunistic Spectrum Access

该文提出了机会频谱接入网络中一种新的多信道MAC协议--OSAM-MAC。它工作在多信道环境中,可以进行频谱感知,利用空闲频谱。采用OSAM-MAC协议,认知用户首先感知所有信道的使用情况,当用户有通信需求时交换信道状态列表,然后选择信道,减少了控制信息开销。同时,避免了隐藏终端问题。仿真结果证明,采用该协议可以提高系统累积吞吐量。

In this paper, a novel multi-channel MAC protocol called OSAM-MAC was proposed for opportunistic spectrum access networks. It works in a multi-channel environment which is capable of performing channel sensing to make use of the source of spectrum. Using OSAM- MAC, the cognitive users firstly sense, the state of all channels, then users having packets to transmit select a channel for transmission after exchange channel state list, so that control message overheads are minimized. Furthermore, the problem of hidden terminal can be avoided. Simulation results show that OSAM-MAC outoerforms in terms of svstem aggregate throughput.