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Setting method of CDMA (code division multiple access) wireless communication network in high-speed rail environment

A wireless communication and network technology, applied in wireless communication, network planning, electrical components, etc., can solve the problems of not considering the influence of Doppler, the workload of optimization and adjustment, etc., to improve construction efficiency, ensure normal communication quality, reduce The effect of optimization work

Active Publication Date: 2013-05-22
CHINA INFOMRAITON CONSULTING & DESIGNING INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current site configuration does not consider the influence of Doppler when making link budgets. At the same time, when defining the three, they are generally measured separately, without considering the influence between the three, resulting in post-network construction. The workload of optimization and adjustment is huge

Method used

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  • Setting method of CDMA (code division multiple access) wireless communication network in high-speed rail environment
  • Setting method of CDMA (code division multiple access) wireless communication network in high-speed rail environment
  • Setting method of CDMA (code division multiple access) wireless communication network in high-speed rail environment

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Embodiment 1

[0040] In the setting method of the CDMA wireless communication network in the high-speed rail environment of the present embodiment, taking CDMA20001X as an example, the CDMA wireless communication network includes a group of base stations, and one base station includes more than two signal sources with the same communication coverage radius. The settings of the signal source meet the following conditions:

[0041] The angle between the signal sources of the same base station is less than

[0042]

[0043] Among them, θ is the 5dB lobe angle of the base station signal source antenna. Here, the 5dB lobe angle of a specific antenna is considered to be 100 degrees.

[0044] Among them, τ is the system switching time requirement (seconds), according to the CDMA20001X soft switching requirement, it is stipulated that the CDMA system switching time is 0.3s.

[0045] Among them, v is the train speed (m / s). The current speed of the Beijing-Shanghai high-speed railway is about 3...

Embodiment 2

[0075] In the past, the setting of the base station paid more attention to the setting of the distance between the base stations, but did not take into account the azimuth angle of the base station signal source antenna, the distance between the base station, and the distance from the railroad track, but set the azimuth angle according to the conventional scene. The included angle of the signal source reaches 120 degrees.

[0076] If in the same scenario as in Embodiment 1, the azimuth angle of the signal source reaches 120 degrees, since the antenna lobe angle is only 100 degrees, the overlapping distance of adjacent coverage cells under the same signal source is zero, which cannot meet the handover requirements. It will lead to call drop, or it is necessary to set up stations at the relative positions of the rails, which will increase the number of stations. This embodiment can ensure normal communication in a high-speed mobile scenario while using a relatively small number ...

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Abstract

The invention discloses a setting method of a CDMA (code division multiple access) wireless communication network in high-speed rail environment. The CDMA wireless communication network comprises a base station set. Each base station comprises more than two signal sources equal in communication coverage radius. Antenna included angle of the base station signal sources meets the conditions that the included angle of the signal sources in the same base station is smaller than phi(S):phi(s)=theta-2*tan<-1>tau*v / s, the theta refers to 5dB lobe angle of the base station signal source antennas, the s refers to a definite distance of the base station signal source antennas from a rail in an actual scene, the tau refers to regulated CDMA system switching time, and the v refers to maximum train speed. Different stations can be set by the method according to different transmission environments before planning and construction, certain relation among azimuth, station spacing and the distance from the rail is guaranteed, construction efficiency can be improved effectively, late optimization work is reduced effectively, and network quality is improved effectively.

Description

technical field [0001] The invention relates to a setting method of a base station site in a wireless communication network, in particular to a setting method of a CDMA wireless communication network in a high-speed rail environment. Background technique [0002] The speed of the high-speed railway is as high as 380 km / h or higher. The trains of the high-speed railway mostly adopt the sealed carriage structure, and the car body is well shielded. If the influence of these factors is prominent, it will have a greater impact on key indicators such as the switching rate and connection rate of mobile communications, resulting in a decline in wireless network performance. The present invention calculates site location setting and sector angle setting according to the impact of the high-speed rail environment, and minimizes the impact of the high-speed rail environment on network quality. [0003] In the wireless network under the high-speed rail environment, the base station is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/18H04W24/02
Inventor 蒋晓虞孔繁俊张磊刘永洲李巍刘远高周玥丹姜涛魏文勇周辉周婧
Owner CHINA INFOMRAITON CONSULTING & DESIGNING INST CO LTD
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