无线Mesh网在城市轨道交通车地通信系统中的研究

摘要

The wireless Mesh network has a broad application prospects in urban mass transit with advantages that flexible networking, a large coverage area and good mobility. This paper applied the wireless Mesh network to the mobile communication environment of urban mass transit. And it proposed a triggered by location based handover scheme and simulated to solve the handoff caused when the train moving along the track. Then, simulated networking solutions and handover scheme of this paper with OPNET. Simulation results show that the performance of Mesh network is better than that of WLAN network and the handover scheme of this paper reduced the interruption time in the handover process effectively and prevented erroneous handover or ping-pong handover.%无线Mesh网因组网灵活、支持范围大和移动性强等特点,使其在城市轨道交通(城轨)中具有很好的应用前景.尝试将无线Mesh网技术应用于城轨车地通信系统中,针对车地通信存在的越区切换问题,提出了一种基于车载MMS(mobile Mesh station)位置触发的越区切换方案,利用OPNET对组网方案和切换方案进行了仿真.仿真结果表明,无线Mesh组网方案性能优于传统WLAN组网方案性能,切换方案能有效降低时延并避免了假切换和乒乓切换的发生.