Patent ID: 8706132
Filing Date: 2014-04-22
Classification: H04W

Abstract:
1. A radio communication system comprising: a mobile station; and a base station configured to perform radio communication with the mobile station by using first and second carrier frequency bands simultaneously in at least one of an uplink direction and a downlink direction, wherein the mobile station and the base station are configured to be able to switch whether or not to perform control relating to the second carrier frequency band using a second radio channel transmitted on the second carrier frequency band, wherein the mobile station and the base station perform the control relating to the second carrier frequency band by using the second radio channel transmitted on the second carrier frequency band when a frequency distance between the first carrier frequency band and the second carrier frequency band is larger than a predetermined threshold, and instead of using the second radio channel transmitted on the second carrier frequency band, the mobile station and the base station perform the control relating to the second carrier frequency band by use of results of control relating to the first carrier frequency band using a first radio channel transmitted on the first carrier frequency band when the frequency distance is not larger than the predetermined threshold.