一种基于TXOP传输机制的多信道多址接入协议

A multi-channel MAC protocol based on TXOP scheme

多址接入协议对无线网络的性能有极大影响,并已成为实现高效无线通信的关键因素。为了提升动态信道分配(DCA)协议的信道资源利用率,设计了一种基于传输机会(TXOP)传输机制的多信道介质访问控制(MAC)(T-DCA)协议。由于T-DCA协议实现简单,可适用于分布式无线网络,如Ad-Hoc以及无线局域网络(WLAN)等。最后,通过搭建NS-2网络仿真平台,验证了T-DCA协议的优越性。仿真结果表明,T-DCA协议有效抑制了协议的冲突概率,提升了网络吞吐量并降低了平均分组时延。

Medium Access Control(MAC)protocol has a great impact on the performance of wireless networks,and it has become a key factor to achieve efficient wireless communications.The Wireless Local Area Network(WLAN)and channel access scheme are firstly introduced,then the research of multi-channel MAC protocol is performed.A typical multi-channel MAC protocol based on common control channel is presented,which is denoted as Dynamic Channel Assignment(DCA)protocol.In order to improve the channel resource utilization of DCA protocol,a multi-channel MAC protocol based on Transmission Opportunity(TXOP)transmission mechanism is proposed,namely T-DCA,i.e.,TXOP based DCA.Because the T-DCA protocol is simple for implementation,it can be utilized in distributed wireless networks,such as Ad-Hoc and WLANs.Finally,the superiority of T-DCA protocol is evaluated by extensive simulations that are deployed using NS-2 simulator.The simulation results show that the T-DCA protocol can not only effectively deduce the collision probability,but also improve the network throughput and reduce the average packet delay.