CN101431757A - Method for computing station spacing by using signal glancing angle in high-speed moving surroundings - Google Patents

Abstract

The invention relates to a method for calculating station space of wireless network base stations, and corresponding device. The method includes: determining coverage radius and switch area of each adjacent base station; on the basis of the coverage radius and switch area of each adjacent base station, determining the station space of the adjacent stations, thereby enabling the glancing angle between each base station and high speed road no less than a predetermined value.

Description

Utilize the signal glancing angle to carry out the computational methods of " station spacing " under the high-speed mobile environment

Technical field

The present invention relates to the network planning in the cordless communication network, network optimization field.

Background technology

Current, the computational methods of wireless network planning " station spacing " typically use the base station covering radius and Zone switched size calculates.

Suppose that coverage radius of cell is R, Zone switched size is H, and station spacing D can use following formula roughly to estimate so:

D＝2*R-H

The account form of following formula is applicable to the station spacing calculating of common city or rural areas, but for the network environment under the high-speed mobile environment, such as CRH motor train unit high-speed railway or highway, do not consider the particularity of high-speed mobile road environment, this particularity comprises user's high-speed mobile, and the user is in very in the compartment of sealing usually, for the glancing angle of wireless signal certain requirement for restriction arranged.

For the wireless network design and the optimization of super expressway, if do not consider the particularity of super expressway, the station spacing the possibility of result that calculates so can't satisfy the requirement of quality of wireless network, manifests the deficiency of wireless network design.

Summary of the invention

The present invention mainly introduces the glancing angle of base station to the signal incident of super expressway in the method for computer installation spacing, thus the further accurately estimation of distance between the base station when network design.

For the accurate Calculation station spacing, the invention provides a kind of method of calculating station space of wireless network base stations, it comprises the steps: to determine separately covering radius of adjacent base station and Zone switched; According to the adjacent base station covering radius separately and the station spacing of Zone switched definite adjacent base station, make the glancing angle of each base station signal and super expressway be not less than predetermined value.

Wherein, the glancing angle of adjacent two base stations can be inequality.

Wherein, the size of minimum glancing angle is relevant with the car body translational speed, and speed is big more, and minimum glancing angle is big more.

Description of drawings

Accompanying drawing 1 is base station and compartment glancing angle schematic diagram;

Accompanying drawing 2 is CRH motor train unit train compartment penetration loss curves;

Accompanying drawing 3 is schematic diagrames between the switch area, base station.

Embodiment

Below in conjunction with accompanying drawing, embodiments of the invention are further described.

The calculating of station spacing and estimation are extremely important when wireless network planning and construction, especially for the expansion of wireless network engineering, have considerable reference.For the design of the station spacing in the super expressway environment, we mainly consider to satisfy the design requirement of Network covering, Zone switched size and signal incident glancing angle size etc.

Glancing angle refers to the angle of base station signal and high-speed mobile car body compartment direction, and the penetration loss in compartment and glancing angle have direct incidence relation, as shown in Figure 1.

Along with reducing of glancing angle, the compartment penetration loss quickens to increase (as shown in Figure 2).So we in the network design and optimizing process of reality, need limit to some extent to minimum glancing angle.Usually the glancing angle of our suggestion should be more than 10 degree.

The wireless signal covering radius of comprehensive glancing angle and base station, we can obtain the computing formula of station spacing under the super expressway environment.As shown in Figure 3.

Among Fig. 3, r1, r2 are respectively the planning covering radiuss of two base station respective cell, and h1, h2 are respectively the distances of two base stations from super expressway, and θ is minimum glancing angle, and h is the Zone switched size of planning.

It is as follows to shift the estimation equation that obtains station spacing onto:

$D=\sqrt{{(r_1\sin \mathrm{\θ}-r_2\sin \mathrm{\θ})}^2+{(r_1\cos \mathrm{\θ}+r_2\cos \mathrm{\θ}-h)}^2}$

Wherein, corresponding different districts covering radius, Zone switched size and the restriction of glancing angle size, in conjunction with the switch area size requirement under the different rates of previous section analysis, we just can calculate the size of station spacing.

With speed: 200km/h is example, station spacing estimation result following (unit: rice):

From top data result as can be seen: use different glancing angles to carry out the base station station spacing and calculate, the result has bigger variation, that is to say, glancing angle is the important factor in order that station spacing is calculated under the super expressway environment.

Claims (6)

1, a kind of method of calculating station space of wireless network base stations, it comprises the steps:

Determine separately covering radius of adjacent two base stations and Zone switched;

According to adjacent two the base station covering radiuss separately and the station spacing of Zone switched definite adjacent base station, make each base station believe

Number be not less than predetermined value with the glancing angle of super expressway.

2, the method for claim 1, wherein definite method of station spacing is:

$D=\sqrt{{(r_1\sin \mathrm{\θ}-r_2\sin \mathrm{\θ})}^2+{(r_1\cos \mathrm{\θ}+r_2\cos -h)}^2}$

Wherein, r1, r2 represent the planning covering radius of two base stations respectively, and θ is minimum glancing angle, and h is Zone switched size.

3, method as claimed in claim 1 or 2, wherein, the glancing angle of adjacent two base stations is inequality.

4, method as claimed in claim 3, wherein, the size of minimum glancing angle is relevant with the car body translational speed, and speed is big more, and minimum glancing angle is big more.

5, a kind of device that calculates station space of wireless network base stations, it comprises following assembly:

Determine adjacent base station covering radius separately and Zone switched assembly,

According to the adjacent base station covering radius separately and the station spacing of Zone switched definite adjacent base station, make the glancing angle of each base station signal and super expressway be not less than the assembly of predetermined value.

6, device as claimed in claim 5, wherein definite method of station spacing is:

$D=\sqrt{{(r_1\sin \mathrm{\θ}-r_2\sin \mathrm{\θ})}^2+{(r_1\cos \mathrm{\θ}+r_2\cos -h)}^2}$

Wherein, r1, r2 represent the planning covering radius of two base stations respectively, and θ is minimum glancing angle, and h is the Zone switched size of planning.

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