一种基于虚拟链路的多信道MAC机制

Virtual Link Based Multi-channel MAC Scheme

在Zigbee协议体系基础上,提出了一种基于虚拟链路的多信道媒质访问机制VL-MAC,针对分簇的网络结构,结合时分和频分复用,簇内由簇头进行时间调度,实现簇内无冲突通信,两簇跳邻簇范围的各簇使用不同的信道,以避免簇间的干扰.簇间的数据传输在一个虚拟链路进行上,连整个网络存在几条互不重叠的虚拟链路,使用虚拟MIMO接收不同链路上的数据,避免Sink周围数据量大造成的严重冲突.VL-MAC解决了隐终端问题.仿真实验表明,VL-MAC减少了整个网络的干扰,降低了传输时延,减少了能耗.

Multi-channel MAC can fully utilize the frequency resources of PHY layer,which can reduce interference and improve throughput Grounded on ZigBee protocol architecture.A virtual link based multi-channel MAC（VL-MAC） was proposed,aiming at clustered network,VL-MAC combines TDMA with FDMA.In VL-MAC,Cluster-heads schedule time-slots achieve non-collision during intra-cluster communication.The clusters in two-cluster hops range use different channel to avoid inter-cluster interference.Inter-cluster communication between the cluster heads is based on virtual link（VL）.There are several un-overlapped VLs.Virtual MIMO is also employed to solve severe enormous data induced collision problems.Furthermore,hidden terminal problem is also considered in our algorithm.Simulation results have shown that interference,latency and energy consumption can be reduced in VL-MAC.