KR20060040765A - Method of designing wibro network on the basis of 2-tier interference - Google Patents

Abstract

The present invention relates to a method for designing a wireless network, and more particularly, to a method for designing a portable Internet wireless network in consideration of interference of adjacent tier cells around a magnetic cell. The present invention provides a method for designing a portable Internet wireless network based on an expected demand subscriber, comprising: setting a radio wave propagation model, calculating a base station / terminal output, a modulation scheme, and a portable Internet system parameter, and a neighbor cell based on the expected demand subscriber. Calculating an interference amount of the base station; calculating a link budget based on the calculated information; calculating base station coverage and base station capacity; designing a wireless network based on the base station coverage, and comparing the base station capacity with an expected demand capacity And relocating the corresponding base station if the capacity of the designed base station is small, and redesigning the wireless network by adding a new base station.

Mobile Internet, Wibro, Wireless Network, Base Station, Adjacent Cell

Description

Method of Designing a Mobile Internet Wireless Network Considering Dual Interference {Method of Designing Wibro Network on the basis of 2-tier Interference}             

1 is a view for explaining a conventional wireless network design method,

2 is a flowchart illustrating a method for designing a portable Internet wireless network according to the present invention;

FIG. 3 is a diagram illustrating a process for applying double interference of an adjacent cell through the system level simulation of FIG. 2.

<Explanation of symbols for the main parts of the drawings>

300: magnetic cell 310: one adjacent cell

320: double adjacent cells

The present invention relates to a method for designing a wireless network, and more particularly, to a method for designing a portable internet wireless network in consideration of interference of adjacent tier cells around a magnetic cell.

The portable Internet refers to a service connected to the Internet anytime and anywhere using a portable terminal such as PDA (Personal Digital Assistants). Standardization work on the mobile Internet is currently actively underway in Korea. For information on standards, reference may be made to the standards numbered from TTAR-0016 # to 0021 #.

In order to commercialize the portable Internet, system development is being carried out based on the portable Internet standard specification, and the portable Internet service provider is trying to design a portable internet wireless network in order to provide high quality service.

On the other hand, a basic method known in the design of a portable Internet wireless network is a method of designing a wireless network by setting a portable Internet radio propagation model, calculating a link budget. In this case, the radio network should be designed in consideration of the interference of the neighboring cells. In general, the radio network is designed by fixing a fixed amount of interference up to approximately two neighboring cells according to the proximity of the neighboring cells. That is, the wireless network is designed using a fixed average user transmission rate and base station capacity by applying neighbor cell user interference at once.

1 illustrates a wireless network designed by collectively applying an interference amount of an adjacent cell. As shown, it is assumed that the first neighboring cell 110 has 20% interference around the magnetic cell 100, and the second neighboring cell 120 has a 5% less than the first neighboring cell 110. Assuming there is interference, the coverage of the own cell is calculated and the entire wireless network is designed.

However, the amount of interference of the adjacent cells 110 and 120 may vary depending on the number of mobile Internet subscribers and various geographical factors. Therefore, if the wireless network is designed by fixing the interference amount of the adjacent cell, it will be possible to design a wireless network that is close to the actual wireless network.

The present invention has been made to solve the above problems, and an object thereof is to provide a method of designing a portable Internet wireless network by applying different interference to adjacent cells.

Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. In addition, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

In order to achieve the above object, the present invention provides a method for designing a portable Internet wireless network based on expected demand subscribers, the method comprising: setting a radio wave propagation model, calculating a base station / terminal output, a modulation scheme, and a portable internet system parameter; Calculating an interference amount of a neighbor cell based on an expected demand subscriber; calculating a link budget based on the calculated information; calculating base station coverage and base station capacity; designing a wireless network based on the base station coverage; Comparing the capacity with the expected demand capacity, and relocating the corresponding base station if the designed base station capacity is small, and redesigning the wireless network by adding a new base station.                     

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations. In addition, in the technical description of the present invention, portable Internet-related standard documents may be incorporated herein.

2 is a flowchart illustrating a method of designing a portable Internet wireless network according to a preferred embodiment of the present invention. Referring to the drawings, a radio propagation model of 2.3 GHz band to be applied to a portable Internet wireless network is first set (see S210 and ITU-R M.1225).

Then, in the wireless network design, system parameters such as base station / terminal output, data modulation scheme and channel coding, which are the most basic parameters, are calculated. With regard to the base station output, the base station position, antenna gain, antenna height, frequency, etc. may be considered.

In addition, the system-level simulation is performed based on the expected demand subscribers of all the cells in the region to be designed to calculate the amount of interference of the neighboring cells centered on the own cells (S220).

The base station coverage and base station capacity are calculated by calculating the link budget based on all these parameters (S230). Base station coverage and base station capacity are performed for all cells.

The entire portable Internet wireless network is designed based on the calculated base station coverage and base station capacity (S240).

On the other hand, if the base station capacity designed for the cell is smaller than the expected demand capacity, a new base station should be added. That is, when the base station capacity is smaller than the expected demand capacity, the base station of the designed cell is relocated, and the base station is added to design the wireless network again (S250 and S260). The estimated capacity can be calculated by multiplying the average demand traffic by the expected demand subscriber. This process can be repeated for each cell.

If the base station capacity designed for all cells is larger than the expected demand capacity, the wireless network design is completed. Subsequently, the wireless network may be redesigned at a time point when the expected capacity exceeds the designed base station capacity based on the expected demand subscribers by year (S270).

FIG. 3 is a diagram for describing a process of applying to a wireless network design designed in consideration of interference of adjacent cells in the process shown in FIG. 2. As shown in the figure, the amount of interference of the adjacent neighboring cells 310 is different with respect to the magnetic cell 300. In addition, the amount of interference of the dual adjacent cells 320 located relatively far from the magnetic cell 300 is also different. As described above, the amount of interference is calculated based on the expected demand subscriber in each region, and it is possible to design a wireless network that is close to the actual one by applying adjacent cell interference parameters to the link budget calculation.

As mentioned above, although this invention was demonstrated by the limited embodiment and drawing, this invention is not limited by this, The person of ordinary skill in the art to which this invention belongs, Of course, various modifications and variations are possible within the scope of equivalent claims. For example, the present invention has been described with reference to a mobile Internet wireless network design, for example, it can be applied to a mobile communication network, digital television network design as well.

According to the present invention, it is possible to design a portable internet wireless network that is close to the actual one by applying the interference amount of the single and double adjacent cells based on the expected demand subscriber to the link budget calculation.

Claims (3)

A method for designing a mobile Internet wireless network based on expected demand subscribers, Establishing a propagation model; Calculating base station / terminal output, modulation scheme and portable Internet system parameters; Calculating an amount of interference of a neighbor cell based on the expected demand subscriber; Calculating base station coverage and base station capacity based on the calculated information; Designing a wireless network based on the base station coverage and comparing the base station capacity with expected expected capacity; And Relocating the base station if the designed base station capacity is small, and redesigning the wireless network by adding a new base station Containing How to design a mobile Internet wireless network. The method of claim 1, The step of calculating the interference amount of the adjacent cell includes the step of calculating the interference amount of the first neighbor cell and the double neighbor cell centered on the magnetic cell, The calculated amount of interference of the single adjacent cell and the amount of double interference are applied to the link budget calculation. How to design a mobile Internet wireless network. The method according to claim 1 or 2, Calculating an expected demand subscriber per year and redesigning the wireless network when the expected demand capacity exceeds the base station capacity; How to design a mobile Internet wireless network.

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