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Plot switchover decision method in linear covering network

A cell handover, overlay network technology, applied in wireless communication, communication between multiple stations, radio/induction link selection and arrangement, etc., can solve the problem of ping-pong handover, call interruption, handover method based on judged signal strength. use, etc.

Inactive Publication Date: 2007-05-09
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The disadvantage of this handover method is that the handover method based on signal strength is no problem in the ordinary GSM system. Handover, the train may have moved out of the service area, resulting in interruption of the call; but if the parameters are adjusted and the handover is performed only based on a small amount of measurement reports, it may cause ping-pong when the train is running at a slow speed or when the staff along the railway are talking. Switching, affecting the call effect
That is, the handover method based on the judgment signal strength commonly used in the GSM system is not suitable for use in the GSM-R system

Method used

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  • Plot switchover decision method in linear covering network
  • Plot switchover decision method in linear covering network
  • Plot switchover decision method in linear covering network

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Embodiment Construction

[0031] Still take the GSM-R system as an example. Considering the linear coverage of the network in the GSM-R system, the characteristics of unidirectional movement and fast movement of the mobile station, when the MS moves rapidly, if the communication system can know the direction of movement of the MS, then when the MS moves to the overlapping area of ​​the cell, it can Immediately switch it to the cell ahead of the move and avoid switching back to the cell behind it.

[0032] To achieve this goal, there are two problems to be solved, one is to judge whether the MS is moving fast, and the other is to judge the moving direction of the MS.

[0033] The above two problems can be solved by using the Doppler effect. The Doppler effect means that when the source of radio waves is far away from the receiver, the wavelength is longer and the frequency is lower; when the source of radio waves is closer to the receiver, the wavelength is shorter and the frequency is higher.

[0034...

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Abstract

This invention relates to a local area switch decision method in a linear covered network including: A acquiring the moving direction and speed of a mobile station in one-way, B decision the moving speed is greater than a designed value, C, carrying out step D if the speed is greater than the designed value and switching the local area according to the traditional way of GSM system, if the speed is smaller than the designed value D. decision the mobile direction of the mobile station is far from or close to the base station steadily, the local area switch is started when it is far from it and it does not switch when getting close.

Description

technical field [0001] The present invention relates to mobile communication technology, more specifically to a cell handover judgment method, especially suitable for use in linear coverage networks such as Global Railways Global System for Mobile communication (GSM-R: Railways Global System for Mobile communication). Background technique [0002] For the cellular mobile communication system of the Global System for Mobile Communications (GSM: Global System for Mobile communications), during a call, as the mobile station (MS: Mobile Station) moves, it is necessary to perform a handover operation to change the current serving cell. Cell handover is initiated by the network. Generally, the signal strength and signal quality of the current serving cell and neighboring cells are obtained according to the measurement report reported by the MS, and then the handover operation is triggered by a certain handover decision algorithm. [0003] In transportation operations such as railw...

Claims

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Application Information

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IPC IPC(8): H04Q7/20H04Q7/36H04B7/26H04W36/26H04W36/30
Inventor 沈敏军汪河
Owner HUAWEI TECH CO LTD