Patent ID: 11903031
Assignee: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A data communication method using multiple carriers by a user equipment in a wireless communication system, the method comprising:
receiving, from a base station, data; and
transmitting, to the base station, a HARQ-ACK related to the data,
wherein the data is transmitted on a first component carrier in a carrier set,
wherein the first component carrier is a component carrier in which back-off using a common back-off counter is completed,
wherein the data is transmitted when the first component carrier is idle during a predetermined defer period by performing a CCA (Clear Channel Assessment) on the first component carrier during the defer period,
wherein the common back-off counter is obtained based on a largest contention window value among contention window values of component carriers included in the carrier set, and
wherein the contention window values of each of the component carriers is independently configured,
wherein the defer period is composed of at least one slot.