US Patent No. 11,071,108

USER EQUIPMENT AND COMMUNICATION METHOD


Patent No. 11,071,108
Issue Date July 20, 2021
Title User Equipment And Communication Method
Inventorship Hideaki Takahashi, Tokyo (JP)
Hiromasa Umeda, Tokyo (JP)
Kazuaki Takeda, Tokyo (JP)
Assignee NTT DOCOMO, INC., Tokyo (JP)

Claim of US Patent No. 11,071,108


1. A user equipment for communicating with a base station in a radio communication system that supports narrow band communication, the user equipment comprising:a receiver that receives, from the base station via a first frequency band, information for identifying a second frequency band, wherein a synchronization signal and broadcast information are transmitted on the first frequency band, and the synchronization signal and the broadcast information are not transmitted on the second frequency band; and
a processor that performs timing alignment control for radio communication on the second frequency band using a signal transmitted on the first frequency band upon detecting that the second frequency band is configured, and that identifies a center frequency of the second frequency band based on the received information,
wherein the information for identifying the second frequency band includes information indicating a center frequency of an uplink carrier in the second frequency band and information indicating a center frequency of a downlink carrier in the second frequency band, and a separation between the center frequency of the uplink carrier in the second frequency band and the center frequency of the downlink carrier in the second frequency band differs from a separation between a center frequency of an uplink carrier in the first frequency band and a center frequency of a downlink carrier in the first frequency band.