Seamless switching method of rail traffic communication system based on WLAN (wireless local area network)

Abstract

The invention discloses a seamless switching method of a rail traffic communication system based on WLAN (wireless local area network). The method comprises the following steps: step1. building TCP connection between a head wireless node and a tail wireless node so as to synchronize the switching state of the head wireless node and the tail wireless node; step 2. synchronizing the head wireless node and the tail wireless node to a correspond end node, wherein the head wireless node and the tail wireless node are correspond end nodes to each other; and step3. firstly checking the switching state stored at the correspond end node before switching the head wireless node and the tail wireless node so as to judge whether the switching can be performed, if so, performing the switching, otherwise, stopping switching. According to the seamless switching method, the two periods of switching time of wireless access between the head wireless node and the trackside node as well as between the tail wireless node and the trackside node can be staggered, thereby avoiding the loss of communication data in the running process and realizing the seamless switching of the track traffic.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a seamless switching method of a WLAN-based rail transit communication system. Background technique [0002] Because rail transit has the characteristics of large capacity and punctual operation, it has gradually become the core component of large-scale urban public transportation. Its operation control and operation security are key technologies in the design of rail transit systems. The implementation of these technologies is based on trains and trains. Ground vehicle-to-ground communication system. [0003] The initial train-to-ground communication system of the rail transit system used a complete set of foreign equipment, and these foreign equipment mainly adopted the Wireless Local Area Network (WLAN) technology following the IEEE802.11 series protocol. WLAN is a very convenient data transmission system. It uses radio frequency (Radio Frequency, RF) technology ...

AI Technical Summary

Problems solved by technology

In fact, due to the high speed of the train and the insufficient distance between the trackside wireless access points, there will be frequent switching between the on-board nodes and the trackside nodes, so it is difficult to ensure the connection between the front and rear wireless nodes and the trackside wireless access points. The two switching times are completely staggered, which will eventually lead to loss of communication data during operation

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