基于最佳数据包长度的MAC机制在无线Mesh网中的应用

MAC协议是无线Mesh网络中的一个重要研究领域.无线通信环境中存在着各种干扰,当发送的数据包受到干扰而不能被正确接收时,MAC协议要求发送端重传该数据包.传统的IEEE 802.11协议在物理层中提供了多种数据速率,如IEEE 802.11b协议中数据以1,2,5.5,11 Mbit/s传送.提出了一种根据信道条件和传输速率,自适应选取最佳数据包长度,并利用RBAR和OAR方式工作的MAC方法--DSAOAR.仿真结果表明,新的机制可以极大地改善网络性能,提高通信质量.

Application of MAC protocol based on packet size optimization for wireless Mesh networks

MAC(Medium Access Control)protocol has been an important research field in wireless Mesh networks.Interferences in wireless communications result in the packet retransmission at the sender when the packet transmission is tampered by the interferences.In IEEE 802.11 protocol,a multi-rate capability in physical layer is provided,for example,in IEEE 802.11b,the data can be transmitted at 1,2 and 5.5 Mbit/s.This paper introduces a new MAC scheme i.e.DSAOAR(Data Size-Adaptive OAR) that combined with RBAR(Receiver-Based AutoRate) and OAR(Opportunistic Auto Rate)methods,which selects the optimal packet size automatically based on the channel conditions and transmission rate.This new algorithm demonstrates a good performance with low computational complexity.