避免波束干扰的高效太赫兹双信道MAC协议

Efficient MIMO Terahertz Dual-channel MAC Protocol to Avoid Beam Interference

现有多输入多输出(MIMO)太赫兹通信网络双信道介质访问控制(MAC)协议工作在WiFi信道和太赫兹信道。多对节点同时在太赫兹信道传输数据存在波束重叠干扰问题,这会使消息传输的成功率和网络吞吐量下降。另外,在WiFi信道进行控制消息交互时存在的控制开销冗余问题会导致信道利用率低。基于这两个问题,文章提出了一种避免波束干扰的高效太赫兹双信道MAC协议(E-ABIMAC)。E-ABIMAC分为波束干扰预判机制、中继辅助机制和基于节点信息省略允许发送帧/确认帧(CTS/ACK)机制。仿真结果表明,与现有的MIMO太赫兹通信网络双信道MAC协议相比,所提协议的网络吞吐量提升了10.1%,信道利用率提升了11.7%,消息传输成功率提升了6.5%。

The existing Multiple Input Multiple Output(MIMO)terahertz communication network dual-channel Medium Access Control(MAC)protocol works on the WiFi channel and the terahertz channel.If multiple pairs of nodes simultaneously transmit data in the terahertz channel,the problem of beam overlap interference occurs,which will reduce the message transmission success rate and network throughput.In addition,there is also a control overhead redundancy problem when the WiFi channel is exchanged for control messages,resulting in channel utilization low.Considering these two issues,the article proposes an Efficient Terahertz Dual-channel MAC Protocol to Avoid Beam Interference(E-ABIMAC).E-ABIMAC is divided into beam interference pre-judgment mechanism,relay assistance mechanism and node information omission based Clear to Send frame/Acknowledgement frame(CTS/ACK)mechanism.The simulation results show that compared with the existing dual-channel MAC protocol for MIMO terahertz communication networks,the network throughput of the proposed protocol is increased by 10.1%,the channel utilization rate is increased by 11.7%,and the message transmission success rate is increased by 6.5%.