Unlicensed spectrum ack/nack feedback method and related devices

An unlicensed spectrum ACK/NACK feedback method, comprising:

• receiving, by a terminal device, a mapping relationship explicitly or implicitly notified by a network device, wherein the mapping relationship comprises a mapping relationship between information about target data sent by the terminal device and indication information for feeding back acknowledgement (ACK)/negative acknowledgement (NACK) by the network device;
• sending, by the terminal device, the target data to the network device based on the mapping relationship;
• determining, by the terminal device, the corresponding indication information based on the information about the target data and the mapping relationship;
• and
• monitoring, by the terminal device based on the indication information for determining to feed back the ACK/NACK, the ACK/NACK fed back by the network device.

A network device, comprising:

• a transmitter, configured to explicitly or implicitly notify a terminal device of a mapping relationship, wherein the mapping relationship comprises a mapping relationship between information about target data sent by the terminal device and indication information for feeding back acknowledgement (ACK)/negative acknowledgement (NACK) by the network device;
• a receiver, configured to receive the target data sent by the terminal device;
• and
• a processor, configured to determine the corresponding indication information based on the information about the target data that is received by the receiver and the mapping relationship, wherein
• the transmitter is further configured to feed back the ACK/NACK to the terminal device based on the indication information that is for determining to feed back the ACK/NACK and that is obtained after the determining performed by the processor.

A terminal device, comprising:

• a receiver, configured to receive a mapping relationship explicitly or implicitly notified by a network device, wherein the mapping relationship comprises a mapping relationship between information about target data sent by the terminal device and indication information for feeding back ACK/NACK by the network device;
• a transmitter, configured to send the target data to the network device based on the mapping relationship received by the receiver;
• and
• a processor, configured to:
• determine the corresponding indication information based on the information about the target data that is sent by the transmitter and the mapping relationship received by the receiver;
• and
• monitor, based on the indication information for determining to feed back the acknowledgement (ACK)/negative acknowledgement (NACK), the ACK/NACK fed back by the network device.