Relay station installation position calculation device, installation position calculation method, and installation position calculation program
An installation position calculation device of a relay station according to an embodiment includes: a first identification circuitry that identifies a position of an installed station candidate point at which an LOS region from the relay station is maximized; a next candidate point extraction circuitry that regards the position identified as a transmission point of a radio wave and extracts two or less top next installed station candidate point at which a next relay station maximizes the LOS region; a correction circuitry that corrects the position of each of the installed station candidate points extracted based on a Fresnel zone for the next relay station; and a second identification circuitry that identifies, as an installation position of the next relay station, a position of a next installed station candidate point at which a reflection angle of the radio wave toward the next installed station candidate point extracted is minimized.
1 . An installation position calculation device of a relay station comprising:
first identification circuitry configured to identify a position of an installed station candidate point at which an line of sight (LOS) region from a relay station is maximized, as an installation position of a first relay station, based on a relayable range of a radio wave by the relay station within an installed station candidate range in which the relay station relaying the radio wave is installable or among a plurality of installed station candidate points determined in advance as installation position candidates of the relay station;
next candidate point extraction circuitry configured to regard an installation position of the first relay station identified by the first identification circuitry as a transmission point of the radio wave, and extract two or less top installed station candidate point at which a next relay station maximizes an LOS region based on a relayable range of the radio wave by the next relay station;
correction circuitry configured to correct a position of each of the next installed station candidate points extracted by the next candidate point extraction circuitry based on a Fresnel zone for the next relay station;
second identification circuitry configured to identify, as an installation position of the next relay station, a position of a next installed station candidate point at which a reflection angle of the radio wave toward the next installed station candidate point extracted by the next candidate point extraction circuitry or the next installed station candidate point of which the position is corrected by the correction circuitry is minimized; and
a controller configured to perform control such that a total number of installation positions of the relay stations identified by the first and second identification circuitries becomes a predetermined number.
2 . The installation position calculation device of the relay station according to claim 1 , further comprising:
candidate point extraction circuitry configured to extract one or more installed station candidate points from the installed station candidate range based on a straight line passing through a transmission point at which a radio wave is transmitted and orthogonal to a surface facing the transmission point,
wherein the first identification circuitry identifies, as an installation position of the first relay station, a position of any one of the installed station candidate points extracted by the candidate point extraction circuitry or a plurality of installed station candidate points determined in advance as installation position candidates of the relay station.
3 . The installation position calculation device of the relay station according to claim 1 ,
wherein the correction circuitry corrects a position of each of the next installed station candidate points extracted by the next candidate point extraction circuitry such that no radio wave obstruction is located within a Fresnel zone for the relay station.
4 . The installation position calculation device of the relay station according to claim 1 ,
wherein the relay station is a reflecting plate that reflects the radio wave.
5 . A non-transitory computer-readable storage medium storing an installation position calculation program of a relay station for causing a computer to function as each circuitry of the installation position calculation device of the relay station according to claim 1 .
6 . An installation position calculation method of a relay station comprising:
identifying a position of an installed station candidate point at which an line of sight (LOS) region from a relay station is maximized, as an installation position of a first relay station, based on a relayable range of a radio wave by the relay station within an installed station candidate range in which the relay station relaying the radio wave is installable or among a plurality of installed station candidate points determined in advance as installation position candidates of the relay station;
regarding an identified installation position of the first relay station as a transmission point of the radio wave, and extracting two or less top next installed station candidate point at which a next relay station maximizes an LOS region based on a relayable range of the radio wave by the next relay station;
correcting a position of each of the extracted next installed station candidate points based on a Fresnel zone for the next relay station;
identifying, as an installation position of the next relay station, the extracted next installed station candidate point or a position of a next installed station candidate point at which a reflection angle of the radio wave toward the next installed station candidate point of which the position is corrected is minimized; and
performing control such that a total number of installation positions of the relay stations identified in the first and second identifying becomes a predetermined number.
7 . The installation position calculation method of the relay station according to claim 6 , further comprising:
extracting one or more installed station candidate points from the installed station candidate range based on a straight line passing through a transmission point at which a radio wave is transmitted and orthogonal to a surface facing the transmission point,
wherein, in the first identifying, a position of any one of the installed station candidate points extracted in the extracting or a plurality of installed station candidate points determined in advance as installation position candidates of the relay station is identified as an installation position of the first relay station.
8 . The installation position calculation method of the relay station according to claim 6 ,
wherein, in the correcting, a position of each of the next installed station candidate points extracted in the extracting is corrected such that no radio wave obstruction is located within a Fresnel zone for the relay station.