HARQ-ACK information transmission method and apparatus

A Hybrid Automatic Repeat reQuest-Acknowledgement (HARQ-ACK) information transmission method, comprising:

• determining the HARQ-ACK information to be transmitted and a resource location on an unlicensed carrier for transmitting the HARQ-ACK information according to a predefinition or a signaling indication;
• performing a listen before talk (LBT) procedure on the unlicensed carrier;
• and
• transmitting the HARQ-ACK information on the resource location after the LBT procedure is successfully performed,
• wherein the signaling indication comprises at least one of:
• a carrier indication for feeding back the HARQ-ACK information;
• a frequency domain resource location for transmitting the HARQ-ACK information;
• a sub-frame position or a sub-frame set for feeding back an acknowledgement or a non-acknowledgement (ACK/NACK);
• a process number or a process group number of the HARQ of a physical downlink shared channel (PDSCH) that requires feedback of the ACK/NACK;
• a signaling indication for indicating a capability of delaying sending the HARQ-ACK information;
• delay time for sending the HARQ-ACK information;
• a size of a predefined transmission window of the ACK/NACK;
• a size of a sliding window of the PDSCH in a plurality of transmission units corresponding to the feedback of the HARQ-ACK information, wherein the sliding window comprises a predetermined number of consecutive downlink transmission units with variable positions;
• a sliding granularity of the sliding window of the PDSCH in the plurality of transmission units corresponding to the feedback of the HARQ-ACK information;
• an adjustment size of the sliding window of the PDSCH in the plurality of transmission units corresponding to the feedback of the HARQ-ACK information;
• or
• a size of the HARQ-ACK information,
• wherein when the HARQ-ACK information comprises an acknowledgement or a non-acknowledgement (ACK/NACK) corresponding to all transmission units of a physical downlink shared channel (PDSCH) in a time window, sliding a sliding window of a PDSCH corresponding to feedback of the HARQ-ACK information according to at least one of a sliding granularity indicated by the signaling, a granularity of one time window length, a granularity of one sliding window length, and a granularity of K transmission units, wherein K is a positive integer.