Method and device for determining antenna downtilt angle based on geographic information system

Abstract

The invention discloses an antenna downward inclination angle determination method and device based on a geographic information system (GIS). The method comprises the following steps: determining an equivalent coverage radius of a cell of each base station according to base station location information in the GIS and the Thiessen polygon principle and determining a maximum coverage radius of the cell of each base station according to an application scene which the cell of each base station is located in; when the equivalent coverage radius is ascertained to be smaller than or equal to the maximum coverage radius, determining the antenna downward inclination angle of the base station which the cell belongs to based on the equivalent coverage radius; and when the equivalent coverage radius is ascertained to be larger than the maximum coverage radius, determining the antenna downward inclination angle of the base station which the cell belongs to based on the maximum coverage radius. According to the technical scheme of the antenna downward inclination angle determination method and device based on the GIS, the problems, that handling capacity in a border cell is reduced and a resource usage ratio is low, caused by unreasonable arrangement of the antenna downward inclination angle of the base station in same-frequency networking in a time division-long term evolution (TD-LTE) system can be avoided, same and adjacent channel interference among cells can be reduced effectively and network service quality and user experience effects are improved.

Description

technical field [0001] The present invention relates to a base station antenna downtilt determination technology, in particular to a method and device for determining an antenna downtilt based on a geographic information system (GIS, Geographic Information System). Background technique [0002] Antenna downtilt setting and antenna downtilt adjustment are very important tasks in network planning and network optimization. Choosing an appropriate downtilt angle can make the ray from the antenna to the boundary of the cell and the ray from the antenna to the boundary of the interfered cell be in the part of the antenna vertical pattern with the largest change in gain attenuation, so that the same-frequency and adjacent-frequency interference of the interfered cell Minimize; In addition, select the appropriate coverage area, so that the actual coverage area of ​​the base station is the same as the expected design area, and at the same time strengthen the signal strength of the co...

AI Technical Summary

Problems solved by technology

Generally, a general-purpose propagation model is used, and the propagation model is corrected by adding the test data of a few local base stations in different scenarios to obtain a local propagation model. There is a problem of inaccuracy of the propagation model, which leads to unreasonable downtilt angle planning.

However, if 3D simulation is used, although the simulation effect is relatively good, it is time-consuming, laborious, and complicated to operate, and the simulation map needs to be continuously updated according to the actual intercity construction, and the investment cost is relatively high; if 2D simulation is used, it will lead to overlapping between cells The unreasonable area and the same-adjacent frequency interference between cells, etc.

[0036] For method 1 and method 2, the acquisition of the cell radius uses two-thirds of the distance between the base station and the key neighboring base station as the cell coverage radius, which is only for the ideal clover structure, and there are various coverages in the actual network , so the radius calculation is unreasonable, which will affect the overlapping coverage between cells, resulting in over-coverage or coverage holes

The influence of base station antenna height on coverage is also not considered. It is obviously unreasonable to regard the coverage of the serving base station cell and the key adjacent base station cell as the same.

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