Wireless access point switching method and apparatus, and train

Abstract

The invention discloses a wireless access point switching method and apparatus, and a train. The method comprises the following steps: detecting multiple to-be-connected wireless APs located on the surrounding of a vehicle-mounted AP; determining a current link establishment AP generating a communication connection with the vehicle-mounted AP at present; obtaining first signal intensity values ofthe to-be-connected wireless APs within a preset time, and obtaining a second signal intensity value of the current link establishment AP within the preset time; separately calculating first time window factors of the to-be-connected wireless APs according to the first signal intensity values; calculating a second time window factor of the current link establishment AP according to the second signal intensity value; determining a target to-be-connected wireless AP from the multiple to-be-connected wireless APs according to the second time window factor and the first time window factors of theto-be-connected wireless APs; and switching the vehicle-mounted AP to the target to-be-connected wireless AP. By adoption of the method, the ping pong effect of wireless AP switching in the clubhouseafter AP signal coverage can be effectively avoided.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a switching method, device and train of a wireless access point. Background technique [0002] The vehicle-ground wireless communication in the urban rail transit signal and communication system usually uses communication standards such as WLAN (Wireless Local Area Network) or LTE (Long Term Evolution, long-term evolution) to establish a series of wireless APs ( Access Point, access point), each wireless AP point on the trackside forms a ground communication network through a communication optical cable, and at the same time, a vehicle-mounted wireless access point AP is set on the train as a mobile terminal. Establish wireless communication between the APs, so as to realize the function of vehicle-ground wireless communication. [0003] In related technologies, when the train is moving, the implementation process of switching between wireless access points in the train-gro...

AI Technical Summary

Problems solved by technology

[0004] However, the current problem is that there are more and more curves on the ground part of rail transit, and more and more buildings are added near the track after the line is running. In the process of switching APs using the traditional wireless access point switching method, Due to the complexity of the environment around the vehicle's operating lines and the uncertainty of external interference signals, using point thresholds or dynamic point thresholds as the basis for switching conditions, in the case of jumps in signal strength, switching ping-pong effects are prone to occur, resulting in Repeated switching reduces the stability of switching and increases the delay and error probability of wireless communication

Images