Method and apparatus, UE, and base station for scheduling-free retransmission for a code block group

A data transmission method, comprising:

• in an unlicensed frequency band of 5G New Radio (NR), transmitting uplink data and associated Uplink Control Information (UCI) to a base station through Autonomous UpLink (AUL) transmission, wherein the base station is capable of identifying a User Equipment (UE) transmitting the uplink data through UE specific Demodulation Reference Signal (DMRS);
• receiving Downlink Feedback Information (DFI) which comprises first information;
• using the first information to determine Hybrid Automatic Repeat reQuest-IDentity (HARQ-ID) of a transport block where a Code Block Group (CBG) that needs to be retransmitted is located, and a sequence number of the CBG that needs to be retransmitted in a HARQ of the transport block where the CBG that needs to be retransmitted is located;
• and
• performing scheduling-free retransmission for the CBG;
• wherein during the above process, in response to the UCI being not successfully decoded, the base station decodes the uplink data, and transmits the DFI to the UE based on whether the transport block or the CBG is successfully decoded.

A data transmission method, comprising:

• in an unlicensed frequency band of 5G New Radio (NR), receiving uplink data and associated Uplink Control Information (UCI) from a User Equipment (UE) through Autonomous UpLink (AUL) transmission;
• identifying the UE through UE specific Demodulation Reference Signal (DMRS);
• decoding the UCI;
• in response to the UCI being not successfully decoded, decoding the uplink data;
• and
• based on whether a transport block or a Code Block Group (CBG) is successfully decoded, transmitting Downlink Feedback Information (DFI) to the UE, wherein the DFI comprises first information, and the UE is capable of using the first information to determine Hybrid Automatic Repeat reQuest-IDentity (HARQ-ID) of a transport block where the CBG that needs to be retransmitted is located, and a sequence number of the CBG that needs to be retransmitted in a HARQ of the transport block where the CBG that needs to be retransmitted is located.