US 11,716,696 B2
User equipment and base station
Hideaki Takahashi, Tokyo (JP); Hiromasa Umeda, Tokyo (JP); and Kei Andou, Tokyo (JP)
Assigned to NTT DOCOMO, INC., Tokyo (JP)
Appl. No. 16/336,796
Filed by NTT DOCOMO, INC., Tokyo (JP)
PCT Filed Jun. 1, 2017, PCT No. PCT/JP2017/020502
§ 371(c)(1), (2) Date Mar. 26, 2019,
PCT Pub. No. WO2018/061322, PCT Pub. Date Apr. 5, 2018.
Claims priority of application No. 2016-192354 (JP), filed on Sep. 29, 2016.
Prior Publication US 2019/0223119 A1, Jul. 18, 2019
Int. Cl. H04W 52/36 (2009.01); H04W 36/00 (2009.01); H04B 1/04 (2006.01); H04W 74/08 (2009.01); H04W 52/38 (2009.01)
CPC H04W 52/367 (2013.01) [H04B 1/04 (2013.01); H04W 36/0085 (2018.08); H04W 52/38 (2013.01); H04W 74/08 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A terminal comprising:
a transceiver that transmits radio signals to and receives radio signals from a base station; and
a controller that controls maximum transmission power to be less than or equal to maximum transmission power of a default power class by applying a regulation of the default power class to a supported first power class, upon transmitting a radio signal to the base station in a frequency band for which a second power class that is lower than the supported first power class is specified as the default power class,
wherein the controller detects whether maximum transmission power of the frequency band is reported from the base station,
wherein, upon detecting that an information element P-Max indicating the maximum transmission power of the frequency band is not included in system information received from the base station prior to establishing a Radio Resource Control (RRC) connection with the base station, the controller controls transmission power for transmitting a random access preamble prior to establishing the RRC connection to be less than or equal to the maximum transmission power of the default power class by applying the regulation of the default power class to the supported first power class, and
wherein, upon detecting that an information element P-Max indicating the maximum transmission power of the frequency band is included in system information received from the base station prior to establishing an RRC connection with the base station and a value higher than the maximum transmission power of the default power class is set to the P-Max, the controller controls transmission power for transmitting a random access preamble prior to establishing the RRC connection to be less than or equal to a maximum transmission power of the supported first power class by applying a regulation of the supported first power class.