Patent ID: 9749998
Date: 2017-08-29
CPC Classifications: H04B,H04L,H04W

Claim:
1. A radio communication method of a user terminal and a radio base station adopting carrier aggregation, the radio communication method comprising the steps in which: the user terminal: selects one of uplink control channel format 2 and uplink control channel format 3 for each cell based on the number of cells to use in carrier aggregation and generates channel state information of the each cell in the selected one of uplink control channel format 2 and uplink control channel format 3; and feeds back the generated channel state information via resources that the radio base station sets in an uplink control channel of a primary cell at a predetermined time in accordance with an uplink control channel format; and wherein the radio base station secures the resources to set in the uplink control channel the channel state information of the primary cell generated in uplink control channel format 2, regardless of the number of cells to use in carrier aggregation.