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Method and device for realizing channel dynamic handoff in train communication system

A train communication and channel technology, applied in the field of communication, can solve the problems of different occupancy rates, large differences in vehicle AP bandwidth, low bandwidth of vehicle AP, etc., and achieve the effect of high bandwidth

Inactive Publication Date: 2010-12-15
NEW H3C TECH CO LTD
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AI Technical Summary

Problems solved by technology

However, at different locations on the subway line, the occupancy rate of each channel of WLAN is different, and the difference is very large. That is to say, the occupancy rate of the same channel at different locations on the subway line may vary greatly, resulting in the The bandwidth varies greatly, and the vehicle AP may only get very low bandwidth

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  • Method and device for realizing channel dynamic handoff in train communication system
  • Method and device for realizing channel dynamic handoff in train communication system
  • Method and device for realizing channel dynamic handoff in train communication system

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Embodiment Construction

[0058] In order to solve the problems in the prior art, in order to solve the problems in the prior art, in the method provided by the present invention, the trackside AP is separated from the vehicle-mounted AP while ensuring that the vehicle-mounted AP quickly finds the trackside AP in front of the train running and avoids interrupting the upper layer communication. When the link is established, the priority of each channel is set by detecting the channel status of each channel, and the detection result is notified to the vehicle AP when the link is established with the vehicle AP, and the vehicle AP selects the optimal channel to communicate with the trackside AP , the vehicle-mounted AP notifies the trackside AP whether the current link is the primary link through a link keep-alive message. When the trackside AP confirms that the link established between itself and the vehicle-mounted AP is the main link, the trackside AP will notify several other trackside APs near the lin...

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Abstract

The invention discloses a method and a device for realizing channel dynamic handoff in a train communication system comprising a plurality of rail-side APs and train-mounted APs, which comprises the steps that: when no link connection is established between the rail-side APs and the train-mounted APs, the state of various channels is detected, and when the link connection is established between the rail-side APs and the train-mounted APs, a channel detection result is sent to the train-mounted APs; the train-mounted APs select an working channel according to the channel detection result of the rail-side APs, if the selected working channel is not the current working channel, the rail-side APs with the link established are notified of the selected working channel; and when the link between the rail-side APs and the train-mounted APs is a main link, the rail-side APs send a notification message carrying own working channel and the train-mounted APs receiving the notification message set the working channel as the working channel for the rail-side APs. The method and the device guarantee that higher bandwidth can be obtained by the train-mounted APs in the train communication system.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for realizing channel dynamic switching in a train communication system. Background technique [0002] With the mature application of WLAN (Wireless Local Area Network, wireless local area network) technology, more and more subway companies have begun to migrate subway-related communication systems to WLAN, such as CBTC (Communication Based Train Control System, communication-based train automatic Control) system and PIS (Product Information System, product information system). Compared with the original wired communication system, the communication system based on WLAN has low construction cost, high bandwidth, and can undertake more application systems. [0003] At present, the WLAN subway communication system includes two parts: the ground part and the vehicle part. The whole system is composed as follows: figure 1 As shown, the vehicle-mounted AP (Access Point,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/30
Inventor 徐国祥
Owner NEW H3C TECH CO LTD
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