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Channel switching method and vehicle-mounted wireless access point suitable for subway turning around

A vehicle-mounted wireless and channel switching technology, applied in wireless communication, vehicle components, electrical components, etc., can solve problems such as limiting the use range of subway wireless communication systems, achieve the effects of ensuring signal quality, smooth switching, and reducing development costs

Active Publication Date: 2009-08-19
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it will inevitably lead to tight coupling between the CBTC or PIS system and the wireless communication system, so that the U-turn process of subway vehicles must rely on third-party systems such as CBTC or PIS
[0005] This solution in the prior art not only requires the CBTC or PIS system to be customized and developed to support the SNMP interface, but also limits the scope of use of the subway wireless communication system to a certain extent

Method used

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  • Channel switching method and vehicle-mounted wireless access point suitable for subway turning around
  • Channel switching method and vehicle-mounted wireless access point suitable for subway turning around
  • Channel switching method and vehicle-mounted wireless access point suitable for subway turning around

Examples

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Embodiment 1

[0035] Embodiment 1 mainly introduces the situation that a vehicle-mounted AP is configured with only one radio. In order to enable the vehicle-mounted AP to identify the AP at the U-turn position, the Basic Service Set Identifier (BSSID, Basic Service Set Identifier) ​​corresponding to the AP at the U-turn position can be pre-configured; at the same time, the field strength threshold required for channel switching can also be pre-configured .

[0036] The concrete steps of embodiment one are as image 3 As shown, the specific introduction is as follows:

[0037] In step 301, when the vehicle is moving, on the current forward channel, the vehicle-mounted AP analyzes the wireless signal of the trackside AP, and detects the BSSID of the trackside AP.

[0038] BSSID is the information carried by the trackside AP in 802.11 messages such as Beacon and Probe. After receiving these messages on the air interface, the vehicle-mounted AP checks the BSSID field to determine whether it...

Embodiment 2

[0045] Embodiment 2 mainly introduces the situation where at least two radios are configured on the vehicle-mounted AP, one of which works on the forward channel and one works on the reverse channel. If there are three or more radios, the There will be one radio working on the forward channel, one radio working on the reverse channel, and other radios will perform other work according to the actual application situation. These two radios can work on the bandwidth of 2.4Ghz or 5.8Ghz at the same time, or work on the bandwidth of 2.4Ghz and 5.8Ghz respectively. In this embodiment, the BSSID corresponding to the U-turn location AP, the field strength threshold, and the switching threshold may be preset. Wherein, the function of the field strength threshold is different from that in the first embodiment. Specifically, in embodiment one, when the wireless signal strength of the U-turn position AP is greater than or equal to the field strength threshold, the radio is switched from ...

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Abstract

The invention discloses a channel switching method suitable for underground turn around and a vehicle wireless access point. The method includes steps as follows: confirming entering into a turn around region through BSSID for identifying turn around position AP through the vehicle AP, starting a channel switching of transmitting and receiving service when the wireless signal intension of the turn around position AP larger than or equal to a set field threshold that judgement for driving direction in the turn around course does not depend on CBTC or PIS system. The method can reduce coupling among systems, reduce development cost of CBTC and PIS, enlarge the usage range of the underground wireless communication system.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a channel switching method and a vehicle-mounted wireless access point suitable for subway U-turns. Background technique [0002] With the progress of society and the continuous acceleration of the pace of life, the subway has gradually become an indispensable means of transportation in people's daily life. In order to realize the train-ground communication between the subway and the ground system, a trackside wireless access point (AP, Access Point) is usually set on one side of the subway, and a wireless channel for communicating with the trackside AP is set. The vehicle-mounted AP on the subway dynamically establishes a wireless link with the trackside AP through the configured channel to realize vehicle-ground communication. [0003] However, in some special areas, such as the U-turn area of ​​the subway, there will be vehicles traveling in both directions. In this case,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/06H04W40/12H04W36/26B60R11/02
Inventor 史扬张海涛周国军徐亚征
Owner NEW H3C TECH CO LTD
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