Method and apparatus for determining path attenuation of radio waves
First Claim
1. A method for determining path attenuation of radio waves in a radio system,in which method at least a two-dimensional vector map describing the environment of a base station is used for determining the coverage area of the base station of the system,and in which the strength of the emission of a transmitter is determined at various points in the environment, characterizedby calculating from the base stations environment described by the vector map a polygon area to which radio waves can propagate both directly and by means of diffraction and reflections,by estimating the strength of the emission of the transmitter at each location point of the transmitter to be examined in the polygon area determined by calculation, andby determining points of the polygon area in advance, storing the determined points in a memory, and reading the stored points from the memory for calculating the polygon area for different location points of the transmitter.
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Accused Products
Abstract
A method and apparatus for determining path attenuation of radio waves in a radio system, in which at least a two-dimensional vector map describing the environment of a base station is used for determining the coverage area of the base station of the system, and in which the strength of the emission of a transmitter is determined at various points in the environment. The invention is implemented by calculating from the base stations environment described by the vector map a polygon area to which radio waves can propagate both directly and by means of diffraction and reflections, by estimating the strength of the emission of the transmitter at each location point of the transmitter to be examined in the polygon area determined by calculation, and by determining points of the polygon area in advance, storing the determined points in a memory, and reading the stored points from the memory for calculating the polygon area for different location points of the transmitter.
74 Citations
8 Claims
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1. A method for determining path attenuation of radio waves in a radio system,
in which method at least a two-dimensional vector map describing the environment of a base station is used for determining the coverage area of the base station of the system, and in which the strength of the emission of a transmitter is determined at various points in the environment, characterized by calculating from the base stations environment described by the vector map a polygon area to which radio waves can propagate both directly and by means of diffraction and reflections, by estimating the strength of the emission of the transmitter at each location point of the transmitter to be examined in the polygon area determined by calculation, and by determining points of the polygon area in advance, storing the determined points in a memory, and reading the stored points from the memory for calculating the polygon area for different location points of the transmitter.
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6. An apparatus for determining path attenuation of radio waves in a radio system comprising at least one base station,
and which apparatus comprises means (600) for maintaining at least a two-dimensional vector map describing the environment of a desired base station, and means (602) for determining the strength of the emission of a transmitter at various points in the environment, characterized in that the apparatus further comprises means (602) for calculating from the base station environment described by the vector map a polygon area to which radio waves can propagate both directly and by means of diffraction and reflections, means (602) for estimating the strength of the emission of the transmitter at each location point of the transmitter to be examined inside the determined polygon area, and means for determining points of the polygon area in advance, means for storing the determined points in a memory and means for reading the stored points from the memory for calculation of the polygon area in said means for calculating for different location points of the transmitter.
Specification