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Dual network card cooperative handover method based on train position

A dual network card, train technology, applied in electrical components, wireless communication and other directions, can solve problems such as link interruption and packet loss, and achieve the effects of accurate switching timing, reducing frequent switching, and stabilizing and reliable data transmission links

Active Publication Date: 2012-06-13
NANJING NRIET IND CORP
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of link interruption in the existing rail transit signal switching process, which is prone to packet loss caused by switching, and to invent a zero-switching time and zero-packet loss-based dual-network card coordination based on train position switch method

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  • Dual network card cooperative handover method based on train position
  • Dual network card cooperative handover method based on train position
  • Dual network card cooperative handover method based on train position

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] As shown in Figure 1-7.

[0027] A dual-network card cooperative switching algorithm based on the train position. This algorithm obtains the current position information of the train through two methods, that is, obtains all trackside APAP (Access Point Wireless) scanned by the vehicle-mounted STA (Station radio station) in the area through background scanning. Access point) information and simultaneous dual network cards work together through mutual exclusion locks. During background scanning, combined with the trackside AP information database to perform fast active roaming switching of the vehicle STA's single network card, and dual network cards work together through mutual exclusion locks to ensure the same Only one network card roaming switch occurs at most at any time, and at least one network card maintains reliable data transmission,...

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Abstract

A dual network card cooperative handover method based on a train position is characterized in that current position information of a train is obtained through two methods, namely information of all access points (AP) beside a track obtained by scanning through a vehicle-mounted single threaded apartment (STA) in an area is obtained through background scanning, and single-network-card fast active roaming handover of the vehicle-mounted STA is conducted by combining an AP information data base beside the track. Simultaneously, dual network cards cooperate to work through a mutual exclusion lock, the fact that at most only one network card performs roaming switching at the same moment is guaranteed, and at least one network card keeps reliable data transmission, thereby enabling the vehicle-mounted STA to provide a fast roaming handover function with zero handover time and zero packet loss for an upper-layer application system of the track, and achieving stable and reliable vehicle-ground data bidirectional transmission. Handover time of a handover algorithm is zero, and a phenomenon of losing packets caused by handover can not occur.

Description

technical field [0001] The invention relates to a wireless switching algorithm of IEEE802.11 series standards in rail transit technology, especially a fast active switching technology with zero switching time and zero packet loss in rail transit, specifically a train position-based Dual network card cooperative switching method. Background technique [0002] Early railway signaling systems mainly used interlocking devices to ensure that trains run safely and efficiently in designated directions on fixed tracks. At present, with the rapid development of computer, communication and automatic control technology, the urban rail transit signal system has developed into an advanced automatic control system - the automatic train control system (ATC system for short), which is a safe and efficient operation of the train. main guarantee. The ATC system has developed from the early fixed block system to the current mobile block system—that is, communication-based train control (CBTC...

Claims

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Application Information

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IPC IPC(8): H04W36/08H04W36/32
Inventor 余锦军李洋
Owner NANJING NRIET IND CORP
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