Transmission method for response information, base station and user equipment

Abstract

Disclosed are a response message transmission method, a base station, and a user equipment (UE), to achieve an improved system performance while taking into account the system resource overhead. The method comprises: the UE confirming K bit of response message awaiting feedback; the UE confirming M number of channel resources awaiting selection, the M number of channel resources awaiting selection comprising J number of dynamic channel resources and N number of semi-static channel resources, wherein M=(J+N), 0=N=M, (M-N)=L=M, and M, L, and N are integers; the UE selecting at least one channel resource from the M number of channel resources, and selecting a piece of identification information for use in characterizing the response message awaiting feedback; on each of the selected channel resources, the UE transmitting the selected identification information for use in characterizing the response message awaiting feedback. Employment of the technical solution of the present invention allows to a certain degree an improved system performance and system throughput, while at the same time taking into account the system resource overhead.

Description

Technical field [0001] The present invention relates to the field of communications, in particular to a method for transmitting response information, a base station and a user terminal. Background technique [0002] Currently, in the LTE-A carrier aggregation (CA) system, PUCCH (Physical Uplink Control Channel) Format 1b with channel selection transmission format can be used as ACK (ACKnowledge Character) or NACK (NegativeACKnowledg Character, negative confirmation character) multiplexing transmission mode. In order to reduce the overhead of uplink control channel resources, the dynamic channel resources reserved by the uplink main carrier should be used as much as possible; in order to avoid unnecessary system retransmissions and improve system throughput performance, LTE (Long Term Evolution) should be avoided There is a many-to-one ambiguity in the ACK / NACK mapping table in the system; and, when the LTE-A system supports cross-carrier scheduling, in order to reduce the standa...

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Problems solved by technology

[0008] To sum up, when setting the ACK / NACK mapping table, it is necessary to consider the type of channel resources used. For all channel resources, the ACK / NACK mapping table of dynamic channel resources is used, and there are many ACK / NACK / DTX combination states. Take the 4-bit ACK / NACK feedback information in the LTE system as an example. There are 19 combined states of ACK / NACK / DTX, but the 4 channel resources and the 4 constellation points modulated by QPSK can distinguish up to 16 states, so there are different ACK / NACK / DTX combinations. Overlapping mapping between NACK / DTX combined states, this mapping method will make the base station unable to determine the state of the ACK / NACK fed back by the UE, thereby increasing the number of system retransmissions and reducing throughput

[0009] Using dynamic channel resources can improve the utilization rate of UE uplink channel resources, but at the same time it will increase the number of ACK / NACK / DTX combined states, which makes the set ACK / NACK mapping table more complicated, which may be due to the change of the distance between codewords. Small or state overlap leads to system performance degradation; the use of high-level semi-statically configured channel resources can reduce the number of ACK / NACK / DTX combined states to a certain extent, thereby increasing the distance between codewords and avoiding state overlap, thereby improving system performance , but increases the overhead of uplink control channel resources

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