US 12,273,818 B2
Communication device, communication method, and communication system
Masahiro Uno, Kanagawa (JP); and Osamu Kozakai, Kanagawa (JP)
Assigned to SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
Appl. No. 17/639,733
Filed by SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
PCT Filed Jul. 15, 2020, PCT No. PCT/JP2020/027440
§ 371(c)(1), (2) Date Mar. 2, 2022,
PCT Pub. No. WO2021/049162, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 2019-165936 (JP), filed on Sep. 12, 2019.
Prior Publication US 2022/0295409 A1, Sep. 15, 2022
Int. Cl. H04W 52/02 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 52/0251 (2013.01) [H04W 74/0833 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A communication device, comprising:
a communication section configured to receive, via a transceiving antenna, a reference signal from a base station;
a measurement section configured to measure a reception-signal level based on the reference signal; and
a decision section configured to:
determine, based on the reception-signal level, a number of times of transmission to start random access to the base station;
determine a sum of a reception target power value at the base station, an attenuation of a first transmission power from the base station to the communication device, and a difference between a gain in a reception frequency band of the transceiving antenna and a gain in a transmission frequency band of the transceiving antenna;
compare the sum with a maximum transmission power of the communication device; and
determine, based on the comparison, a second transmission power for the start of the random access to the base station.