US 12,120,616 B2
Local wireless communication system, radio field intensity control method, control device, and program
Daisuke Murayama, Musashino (JP); Koichi Ishihara, Musashino (JP); Kenichi Kawamura, Musashino (JP); and Takatsune Moriyama, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/908,310
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Mar. 2, 2020, PCT No. PCT/JP2020/008703
§ 371(c)(1), (2) Date Aug. 31, 2022,
PCT Pub. No. WO2021/176521, PCT Pub. Date Sep. 10, 2021.
Prior Publication US 2023/0097069 A1, Mar. 30, 2023
Int. Cl. H04W 24/10 (2009.01); H04W 52/24 (2009.01)
CPC H04W 52/245 (2013.01) [H04W 24/10 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A local wireless communication system forming a wireless communication environment in a licensed bandwidth, the local wireless communication system comprising:
a base station configured to emit radio waves to form the wireless communication environment in a predetermined area;
a plurality of sensors is disposed along an edge of the predetermined area;
a plurality of beams corresponding to the plurality of sensors, wherein the plurality of beams are formed in a time division manner; and
a control apparatus communicable with the base station;
wherein each of the plurality of sensors and plurality of beams is
configured to measure a radio field intensity of the radio wave emitted from the base station,
generate a feedback signal including the measured radio field intensity,
transmit the feedback signal to the base station;
wherein the base station is
configured to control a transmission power of the radio waves,
receive the feedback signal from the plurality of sensors and the plurality of beams,
notify the control apparatus of the radio field intensity included in the received feedback signal;
control the transmission power of the radio wave for each of the plurality of beams, wherein the transmission power is a control parameter for controlling the power of each beam in the plurality of beams;
calculate information for controlling the transmission power for each of the plurality of beams according to the radio field intensity; and
generate and transmit a power measurement signal;
wherein the control apparatus is
configured to
calculate a next transmission power for each beam of the plurality of beams according to the radio field intensity measured by the plurality of sensors;
determine a difference between the transmission power and the next transmission power;
terminate transmission in response to the difference being less than or equal to a threshold value;
transmit the power measurement value of each beam of the plurality of beams in response to the difference being greater than the threshold value, wherein the power measurement signal is the next transmission power;
update the transmission power according to the next transmission power; and
provide the transmission power to the base station to control the notified radio field intensity.