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CBTC system switching algorithm based on train speed

A system switching and train technology, applied in electrical components, wireless communication, etc., can solve problems such as data packet loss, CBTC system vehicle-to-ground communication delay, etc., to reduce the ping-pong switching rate, improve the switching success rate and network throughput. Effect

Active Publication Date: 2018-04-20
LANZHOU JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a CBTC system switching algorithm based on the train speed, which solves the problem that the train needs to be switched multiple times during the running process, which easily causes the CBTC system vehicle-ground communication delay and data packet loss.

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  • CBTC system switching algorithm based on train speed
  • CBTC system switching algorithm based on train speed
  • CBTC system switching algorithm based on train speed

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Embodiment Construction

[0037] The present invention will be described in detail below in combination with specific embodiments.

[0038] The algorithm flow of the present invention is as figure 1 As shown, the steps are as follows:

[0039] Step1: Scan the received signal strength of APs around the train to find new APs;

[0040] Step2: According to the received signal strength of the new AP, determine whether the handover trigger condition is met;

[0041] Wherein, the trigger condition is that the received signal strength of the new AP is higher than the received signal strength of the current AP by H (hysteresis factor).

[0042] Step3: Measure the running speed of the train, and select the appropriate switching threshold value according to the speed value;

[0043] In the urban rail transit CBTC system, when the train runs along the line from the coverage of one AP to the coverage of the next AP, switching will occur, and the entire switching process is automatically triggered. In order to a...

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Abstract

The invention discloses a CBTC system switching algorithm. The CBTC system switching algorithm comprises the following steps: scanning receiving signal intensity of APs around a train, and discoveringnew APs; according to the receiving signal strength of the new APs, judging whether a switching trigger condition is satisfied; measuring a running speed of the train, and selecting an appropriate switching threshold according to the speed value; and executing switching, and adding 1 to a counter. The CBTC system switching algorithm has the beneficial effects of being able to further reduce the ping pong switching rate and improve the switching success rate and the network throughput.

Description

technical field [0001] The invention belongs to the intersection field of wireless communication and transportation, and relates to a CBTC system switching algorithm based on train speed. Background technique [0002] In recent years, my country's urban rail transit has developed rapidly, effectively alleviating the pressure on urban traffic. The CBTC (Communications Based Train Control) system can further shorten the running interval and improve the operation efficiency on the premise of ensuring the safety of train operation, and has become an indispensable part of the urban rail transit system. At present, most urban rail transit systems use CBTC systems based on WLAN (Wireless Local Area Networks) technology to realize safe and reliable transmission of train-ground information, including IEEE 802.11b / g / n / ac series protocols. Among them, the IEEE 802.11ac protocol is the latest wireless local area network standard. In 2016, the PIS (Passenger Information System, Passenge...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00H04W36/08H04W36/18H04W36/32
CPCH04W36/0016H04W36/0088H04W36/08H04W36/18H04W36/32
Inventor 张雁鹏梁春燕党建武林俊亭张鑫闵永智张振海王海涌
Owner LANZHOU JIAOTONG UNIV
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