A user equipment, comprising: a receiving unit adapted to receive, according to a 3GPP standard, a control signaling for uplink scheduling from a base station, wherein the received control signaling for uplink scheduling supports transmission of at least one transport block, TB, and includes at least one modulation and coding scheme, MCS, field, a channel quality information request field, and a resource block allocation field which indicates the number of resource blocks, RBs, denoted by N RB, allocated by the base station for the user equipment to transmit channel quality information of at least one downlink carrier, the N RB being a positive integer; and a transmission unit adapted to transmit, when a condition for transmitting only the channel quality information on an uplink shared channel is fulfilled, only the channel quality information on the uplink shared channel according to the allocated RBs to the base station, wherein if the channel quality information of multiple downlink carriers is requested to be transmitted by the user equipment, the condition for transmitting only the channel quality information on the uplink shared channel is fulfilled if the following conditions are met: the MCS field corresponding to the TB indicates a MCS corresponding to a retransmitted data packet if the control signaling for uplink scheduling supports transmission of one TB; the MCS field corresponding to only one of the at least one TBs indicates a MCS corresponding to a retransmitted data packet if the control signaling for uplink scheduling supports transmission of two TBs; the channel quality information request field indicates a request for transmitting the channel quality information; and the N RB is equal to or less than a threshold, the threshold being related to the number of the multiple downlink carriers, denoted by N, and a maximum number of RBs which can be allocated for transmitting the channel quality information of one downlink carrier only, wherein N is a positive integer. a receiving unit adapted to receive, according to a 3GPP standard, a control signaling for uplink scheduling from a base station, wherein the received control signaling for uplink scheduling supports transmission of at least one transport block, TB, and includes at least one modulation and coding scheme, MCS, field, a channel quality information request field, and a resource block allocation field which indicates the number of resource blocks, RBs, denoted by N RB, allocated by the base station for the user equipment to transmit channel quality information of at least one downlink carrier, the N RB being a positive integer; and a transmission unit adapted to transmit, when a condition for transmitting only the channel quality information on an uplink shared channel is fulfilled, only the channel quality information on the uplink shared channel according to the allocated RBs to the base station, wherein if the channel quality information of multiple downlink carriers is requested to be transmitted by the user equipment, the condition for transmitting only the channel quality information on the uplink shared channel is fulfilled if the following conditions are met: the MCS field corresponding to the TB indicates a MCS corresponding to a retransmitted data packet if the control signaling for uplink scheduling supports transmission of one TB; the MCS field corresponding to only one of the at least one TBs indicates a MCS corresponding to a retransmitted data packet if the control signaling for uplink scheduling supports transmission of two TBs; the channel quality information request field indicates a request for transmitting the channel quality information; and the N RB is equal to or less than a threshold, the threshold being related to the number of the multiple downlink carriers, denoted by N, and a maximum number of RBs which can be allocated for transmitting the channel quality information of one downlink carrier only, wherein N is a positive integer. the MCS field corresponding to the TB indicates a MCS corresponding to a retransmitted data packet if the control signaling for uplink scheduling supports transmission of one TB; the MCS field corresponding to only one of the at least one TBs indicates a MCS corresponding to a retransmitted data packet if the control signaling for uplink scheduling supports transmission of two TBs; the channel quality information request field indicates a request for transmitting the channel quality information; and the N RB is equal to or less than a threshold, the threshold being related to the number of the multiple downlink carriers, denoted by N, and a maximum number of RBs which can be allocated for transmitting the channel quality information of one downlink carrier only, wherein N is a positive integer.