Patent ID: 9130717
Filing Date: 2015-09-08
Classification: H04L,H04W

Abstract:
1. A method of receiving a sounding reference signal (SRS) by a base station in a wireless communication system, the method comprising: transmitting, to a user equipment, a radio resource control (RRC) message for configuring at least one second component carrier (CC) in addition to a first CC configured in the user equipment; transmitting, to the user equipment, a medium access control (MAC) message for activating the at least one second CC other than the first CC, the MAC message including a bitmap for indicating the at least one second CC to be activated; transmitting, to the user equipment, a physical downlink control channel (PDCCH) including a carrier indicator field (CIF) and an SRS field via the first CC, the CIF indicating a CC of the at least one second CC and the SRS field indicating whether the user equipment has to transmit the SRS via the CC indicated by the CIF; and receiving, from the user equipment, the SRS on an uplink subframe via the CC indicated by the CIF, when the SRS field is enabled, wherein the CC indicated by the CIF is one of the at least one second CC activated based on the bitmap included in the MAC message.