ELECTRONIC APPARATUS, SYSTEM, METHOD, AND STORAGE MEDIUM
According to one embodiment, an electronic apparatus includes a processor. The processor generates data of a missing part on a radio wave map to which data relating to received power of a radio signal at points in a predetermined geographical range is mapped based on a status of a propagation path between a first wireless device configured to travel in the predetermined geographical range and a second wireless device configured to form a wireless communication area including the predetermined geographical range.
1 . An electronic apparatus comprising:
a processor configured to generate data of a missing part on a radio wave map to which data relating to received power of a radio signal at points in a predetermined geographical range is mapped based on a status of a propagation path between a first wireless device configured to travel in the predetermined geographical range and a second wireless device configured to form a wireless communication area including the predetermined geographical range.
2 . The electronic apparatus of claim 1 , wherein the processor is configured to determine the status of the propagation path using received power measured from a synchronization signal or a reference signal transmitted and received between the first wireless device and the second wireless device.
3 . The electronic apparatus of claim 2 , wherein:
the processor is configured to determine the status of the propagation path using map information in the predetermined geographical range; and
the map information is updated at any time based on scan data of one or more laser range finders (LRFs) installed in the first wireless device or a mobile body equipped with the first wireless device.
4 . The electronic apparatus of claim 1 , wherein the processor is configured to determine the status of the propagation path based on a difference between first received power measured on a side of the first wireless device and second received power measured on a side of the second wireless device.
5 . The electronic apparatus of claim 4 , wherein the processor is configured to
acquire a plurality of the first received powers to a predetermined resolution of the radio wave map, and
determine the status of the propagation path based on a difference between the plurality of the first received powers.
6 . The electronic apparatus of claim 5 , wherein:
the radio wave map includes a first resolution and a second resolution lower than the first resolution; and
the predetermined resolution is the first resolution.
7 . The electronic apparatus of claim 1 , wherein the processor is configured to determine the status of the propagation path based on information regarding a direct wave and a reflected wave obtained by a Rician factor or a spatial correlation.
8 . The electronic apparatus of claim 1 , wherein the processor is configured to
calculate received power for a frequency or an impulse response of the propagation path using a demodulation reference signal (DMRS) transmitted and received between the first wireless device and the second wireless device, and
determine the status of the propagation path based on the received power for the frequency or a frequency response obtained from the impulse response of the propagation path.
9 . The electronic apparatus of claim 1 , wherein the processor is configured to determine the status of the propagation path based on a change in an attenuation multiplier of received power to a distance between the first wireless device and the second wireless device.
10 . The electronic apparatus of claim 1 , wherein the processor is configured to generate data of a missing part on the radio wave map based on a first variation of received power, when the received power of a direct wave is larger than the received power of a reflected wave.
11 . The electronic apparatus of claim 1 , wherein the processor is configured to generate data of a missing part on the radio wave map based on a second variation of received power or a third variation of the received power in a section longer than the second variation, when the received power of a reflected wave is larger than the received power of a direct wave.
12 . The electronic apparatus of claim 10 , wherein:
the processor is configured to generate data of a missing part on the radio wave map based on a second variation of received power or a third variation in a section longer than the second variation, when the received power of the reflected wave is larger than the received power of the direct wave; and
the second variation is a variation in a section longer than the first variation.
13 . The electronic apparatus of claim 1 , wherein the processor is configured to output reliability of data of at least the generated missing part in the radio wave map.
14 . The electronic apparatus of claim 12 , wherein the processor is configured to reduce reliability of data of the missing part, which is generated using data in which a difference between first received power measured on the first wireless device side and second received power measured on the second wireless device side is equal to or greater than a predetermined value, lower than reliability of data other than the missing part.
15 . The electronic apparatus of claim 1 , wherein:
the processor is configured to generate a route on the predetermined geographical range in which the first wireless device has to travel based on the radio wave map obtained by generating and interpolating the data of the missing part; and
the electronic apparatus further comprises an output device configured to output the route generated by the processor to the first wireless device.
16 . A system comprising:
a first wireless device configured to travel in a predetermined geographical range;
a second wireless device configured to form a wireless communication area including the predetermined geographical range; and
the electronic apparatus of claim 1 .
17 . A method comprising:
generating data of a missing part on a radio wave map to which data relating to received power of a radio signal at points in a predetermined geographical range is mapped based on a status of a propagation path between a first wireless device configured to travel in the predetermined geographical range and a second wireless device configured to form a wireless communication area including the predetermined geographical range.
18 . A non-transitory computer-readable storage medium having stored thereon a computer program which is executable by a computer, the computer program controlling the computer to execute functions of:
generating data of a missing part on a radio wave map to which data relating to received power of a radio signal at points in a predetermined geographical range is mapped based on a status of a propagation path including time variation between a first wireless device that travels in the predetermined geographical range and a second wireless device that forms a wireless communication area including the predetermined geographical range.