Rapid route updating method for rail traffic communication system based on WLAN (wireless local area network)

Abstract

The invention discloses a rapid route updating method for a rail traffic communication system based on a WLAN (wireless local area network). The rapid route updating method comprises the following steps: step1. in the forward process of a train, after a vehicle-mounted STA (single threaded apartment ) switches from a trackside AP (access point) to another trackside AP, the trackside AP newly connected can immediately obtain the MAC (media access control) address of the vehicle-mounted STA, then the massage containing the MAC address of the vehicle-mounted STA is sent to a trackside server; and step 2. after the trackside server receives the massage containing the MAC address of the vehicle-mounted STA, the content of the massage is analyzed, if the MAC address of the vehicle-mounted STA conforms to the standard of the MAC address of the internet, the MAC address replies the correct responding message, and a routing table of the server is immediately updated; if not, the inaccurate responding message returns. According to the rapid route updating method for the rail traffic communication system based on the WLAN, a static route is adopted, and the temporarily interrupt of the internet, which is caused by the dynamic routing convergence time during the switching of the STA and the trackside AP is avoided.

Description

technical field [0001] The technical field of wireless communication of the present invention relates to a fast route updating method of a WLAN-based rail transit communication system. Background technique [0002] WLAN communication has been more and more widely used due to its advantages of high bandwidth, free communication, and flexible networking. In rail transit, broadband communication between the train and the trackside is realized by using WLAN technology. Place STAs on rail transit trains and APs next to the tracks. When the STA establishes a connection with the trackside AP, the data communication between the train and the trackside can be realized. The system structure of the existing WLAN-based rail transit communication system is as follows: figure 1 As shown, it includes a ground application system, a trackside system and a vehicle-mounted system; the ground application system includes a service center, which manages and serves multiple trackside systems in...

AI Technical Summary

Problems solved by technology

Due to the existence of network convergence time, the communication will be temporarily interrupted, so if the real-time video image of the car is transmitted in the network, the image will be paused

[0004] In the rail transit system, when the train is running on the track, the on-board STA on the train needs to continuously switch with the trackside AP. Each switch will generate a route update, and each route update will generate a route convergence. As a result, the communication of the train is often interrupted during operation.

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