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A fast optical wavelength switching method for high-speed railway broadband wireless communication

A broadband wireless communication, high-speed railway technology, applied in wireless communication, optical fiber radio, optical fiber transmission and other directions, can solve the problems of dropped calls, frequent handovers, reduce user experience, etc., achieve zero delay, facilitate centralized management and maintenance , the effect of reducing the cost of network construction

Active Publication Date: 2020-12-18
SOUTHWEST JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the specific scenario of high-speed railway, the high-speed running of the train will lead to very frequent handover, and the high-speed movement also puts forward higher requirements for the minimum delay of the system to process the handover
For example, if the speed of the train is fast enough that the time to cross the wireless coverage interval of a single remote radio unit is less than the minimum delay for the system to handle wavelength switching, it will cause dropped calls and degrade user experience

Method used

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  • A fast optical wavelength switching method for high-speed railway broadband wireless communication
  • A fast optical wavelength switching method for high-speed railway broadband wireless communication

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Embodiment Construction

[0013] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0014] When the train is running in the whole section, one optical wavelength (that is, an optical carrier of one wavelength) supports the data capacity of a high-speed train, and optical carriers of different wavelengths are transmitted by the optical line terminal 10 through the optical fiber link 20 in the wavelength division multiplexing mode to a plurality of remote radio frequency units 30, 31, 32, 33 distributed along the road section (see figure 1 ); each remote radio frequency unit 30 (or 31 or 32 or 33) covers the area along the railway in a strip shape, and each remote radio frequency unit 30 includes all optical wavelength resources. During the high-speed operation of the whole train, a certain A fixed wavelength is assigned to the train to support its broadband wireless access service; when the train enters the coverage area of ​​a re...

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Abstract

A fast optical wavelength switching method for high-speed railway broadband wireless communication. When the train is running in a certain road section containing multiple remote radio frequency unit intervals, the same optical wavelength supports the data capacity of a high-speed train; different wavelength optical carriers are wavelength division multiplexed and transmitted to the road section through optical fiber links Multiple RRUs. RRUs cover the area along the railway in a strip shape, and all RRUs contain all optical wavelength resources. In this road section, the train always occupies the same optical wavelength resource during high-speed operation in the sections covered by each RRU, thus avoiding the frequent wavelength switching required due to the rapid change of the section under high-speed operation, thereby ensuring wireless transmission of high-speed trains during operation. Smoothness and reliability of communication.

Description

technical field [0001] The invention relates to a wireless communication method over light, in particular to a communication method for fast switching of optical wavelengths in the scenarios of high-speed railway broadband wireless access and network coverage. Background technique [0002] At present, China has established the world's largest high-speed railway network, with an operating mileage of more than 22,000 kilometers, accounting for more than 65% of the world's total. Although the existing railway integrated digital mobile communication system (GSM-R) can be applied to high-speed railways (>250km / h), it cannot meet various emerging services such as new media, high-definition video, virtual reality / augmentation due to the limited transmission rate Reality (VR / AR) and other high-speed passengers have an increasing demand for wireless access speed. In order to meet the broadband access requirements in high-speed railways, different wireless access solutions based o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W88/08H04B10/2575H04W72/04
CPCH04B10/2575H04W72/0453H04W88/085
Inventor 邹喜华李沛轩潘炜
Owner SOUTHWEST JIAOTONG UNIV