US Patent No. 10,893,489

USER DEVICE, BASE STATION, COMMUNICATION METHOD, AND INSTRUCTION METHOD


Patent No. 10,893,489
Issue Date January 12, 2021
Title User Device, Base Station, Communication Method, And Instruction Method
Inventorship Kei Andou, Tokyo (JP)
Kazuki Takeda, Tokyo (JP)
Tooru Uchino, Tokyo (JP)
Kunihiko Teshima, Tokyo (JP)
Assignee NTT DOCOMO, INC., Tokyo (JP)

Claim of US Patent No. 10,893,489

1. A user device for a radio communication system supporting uplink dual connectivity, the user device comprising:a transmitter that transmits an uplink signal to a base station by using a first component carrier and a second component carrier having a time length shorter than a Transmission Time Interval (TTI) length of the first component carrier; and
a processor that calculates a lower limit and an upper limit of a maximum transmission power of the uplink signal according to predetermined formulas using a subframe of the first component carrier as a reference subframe,
wherein the processor further
combines the subframe of the first component carrier with respective periods of the second component carrier that overlap the subframe of the first component carrier between a start point and an end point of the subframe of the first component carrier,
calculates the lower limit of the maximum transmission power using one of the combinations whose lower limit of the maximum transmission power is smallest, and
calculates the upper limit of the maximum transmission power using one of the combinations whose upper limit of the maximum transmission power is largest.