Link switching method under high-speed motion state, vehicle-mounted AP and system
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A technology of high-speed motion and link switching, applied in the field of network communication, which can solve problems such as packet loss
Inactive Publication Date: 2014-04-16
RUIJIE NETWORKS CO LTD
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[0006] Embodiments of the present invention provide a link switching method, a vehicle-mounted AP, and a system in a high-speed motion state to solve the problem of data packet loss caused by frequent link switching in the prior art
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Embodiment 1
[0039] Embodiment 1 of the present invention provides a link switching method in a high-speed motion state, such as image 3 As shown, it specifically includes the following steps:
[0040] S301. Obtain the signal strength of the trackside AP monitored by the vehicle-mounted AP according to the preset monitoring rule.
[0041] In this step, the preset monitoring rule can be set according to the actual situation, for example, it can be set to periodic monitoring or real-time monitoring. The vehicle-mounted AP can monitor the signal strength of each trackside AP that can monitor the signal according to the preset monitoring rules.
[0042] Further, the vehicle-mounted AP can monitor the trackside AP by detecting the Beacon frame sent by each trackside AP, and determine the trackside AP that is being intercepted according to the MAC address and signal strength of the trackside AP that sent the Beacon frame carried in each Beacon frame. Next to AP information.
[0043] Furthermore, the v...
Embodiment 2
[0057] In Embodiment 2 of the present invention, a vehicle-mounted AP fault detection mechanism is provided for a vehicle-mounted AP, that is, a method for link switching of a vehicle-mounted switching device, such as Figure 4 As shown, it specifically includes the following steps:
[0058] S401: Detect the connectivity of the main communication link through which the vehicle-mounted switching device communicates through the vehicle-mounted AP by using the vehicle-mounted switching device connected to the vehicle-mounted AP according to a preset detection rule.
[0059] Furthermore, each subway car can also be equipped with on-board switching equipment, which is connected to the on-board AP externally, and can be connected internally to wired equipment in the car, such as a camera. It can also be connected to a dual-channel AP, which is the wireless in the car. The device provides an access point. Take a subway car as an example. When each subway car has an on-board AP, the link b...
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Abstract
The embodiment of the invention provides a link switching method under a high-speed motion state, a vehicle-mounted AP and a system. Signal strength of a trackside AP is obtained, wherein the signal strength of the trackside AP is monitored by the vehicle-mounted AP according to a preset monitoring rule; whether a main trackside AP which sets up bridging with the vehicle-mounted AP meets the following conditions at the same time or not is judged and the following conditions are that the signal strength of the main trackside AP is less than a preset switching threshold value; the signal strength of the main trackside AP is less than that of a standby trackside AP of the vehicle-mounted AP; the signal strength difference between the main trackside AP and the standby trackside AP is larger than the preset difference threshold value; if the conditions are met, the standby trackside AP is updated to be the main trackside AP, and the vehicle-mounted AP sets up bridging with the updated main trackside AP. The problem of data packet dropout caused by frequent link switching in the prior art is solved. The link switching method under the high-speed motion state relates to the technical field of network communication.
Description
Technical field [0001] The present invention relates to the technical field of network communication, in particular to a link switching method, a vehicle-mounted AP and a system in a high-speed motion state. Background technique [0002] With the development of wireless communication technology, wireless networks have become ubiquitous, even in relatively closed environments, such as subways. In the prior art, a wireless network may also exist in a subway car, and the network system of the subway may include an onboard part and an outside part. Figure 1a-Figure 1b It is a schematic diagram of the network connection of a subway car traveling in a tunnel. A subway car with an on-board access point (AP, Access Point) is traveling in a tunnel. A trackside AP is set at a preset distance in the tunnel, so that the on-board AP can establish a connection with the trackside AP for use in the subway car. The terminal communicates wirelessly through the vehicle-mounted AP. [0003] The vehi...
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Application Information
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