Feedback information transmission method, related device, and communications system

A feedback information transmission method, comprising:

• sending, by an access network device, downlink data to a terminal device in a downlink subframe in at least one downlink burst;
• receiving, by the access network device on a first uplink channel in a first uplink subframe, first feedback information sent by the terminal device, wherein the first uplink subframe is associated with a first downlink subframe set, wherein the first downlink subframe set belongs to the at least one downlink burst, wherein the first feedback information is corresponding to downlink data in the first downlink subframe set, wherein the first uplink subframe is in a first uplink burst, and wherein the first uplink burst follows the at least one downlink burst;
• sending, by the access network device, overlapping codebook indication information to the terminal device, wherein the overlapping codebook indication information is used by the terminal device to determine a second downlink subframe set associated with a second uplink subframe;
• and
• receiving, by the access network device on a second uplink channel in the second uplink subframe, second feedback information sent by the terminal device, wherein the second uplink subframe is associated with the second downlink subframe set, wherein the second downlink subframe set belongs to the at least one downlink burst, wherein the first downlink subframe set is a subset of the second downlink subframe set, wherein the second feedback information is corresponding to downlink data in the second downlink subframe set, wherein the second uplink subframe is in the first uplink burst, and wherein the second uplink subframe follows the first uplink subframe.

A terminal device, comprising at least one processor, a memory, and a communications module, wherein the memory is configured to store program code for transmitting feedback information, and wherein the at least one processor is configured to invoke the program code, to perform the following operations:

• receiving, by the processor by using the communications module in a downlink subframe in at least one downlink burst, downlink data sent by an access network device;
• determining, by the at least one processor, that a first downlink subframe set is associated with a first uplink subframe, wherein the first downlink subframe set belongs to the at least one downlink burst, the first uplink subframe is used to send first feedback information corresponding to downlink data in the first downlink subframe set, the first uplink subframe is in a first uplink burst, and the first uplink burst follows the at least one downlink burst;
• determining, by the at least one processor, a first feedback information codebook;
• determining, by the at least one processor, the first feedback information based on the first feedback information codebook;
• determining, by the at least one processor, a first uplink channel in the first uplink subframe;
• sending, by the at least one processor, the first feedback information to the access network device by using the communications module on the first uplink channel;
• receiving, by using the communications module, overlapping codebook indication information sent by the access network device;
• determining, based on the overlapping codebook indication information, that a second downlink subframe set is associated with a second uplink subframe, wherein the second downlink subframe set belongs to the at least one downlink burst, wherein the first downlink subframe set is a subset of the second downlink subframe set, wherein the second uplink subframe is used to send second feedback information corresponding to downlink data in the second downlink subframe set, wherein the second uplink subframe is in the first uplink burst, and wherein the second uplink subframe follows the first uplink subframe;
• determining a second feedback information codebook;
• determining the second feedback information based on the second feedback information codebook;
• determining a second uplink channel in the second uplink subframe;
• and
• sending the second feedback information to the access network device by using the communications module on the second uplink channel.

An access network device, comprising at least one processor, a memory, and a communications module, wherein the memory is configured to store program code for transmitting feedback information, and the at least one processor is configured to invoke the program code, to perform the following operations:

• sending, by the at least one processor, downlink data to a terminal device by using the communications module in a downlink subframe in at least one downlink burst;
• receiving, by the at least one processor by using the communications module on a first uplink channel in a first uplink subframe, first feedback information sent by the terminal device, wherein the first uplink subframe is associated with a first downlink subframe set, wherein the first downlink subframe set belongs to the at least one downlink burst, wherein the first feedback information is corresponding to downlink data in the first downlink subframe set, wherein the first uplink subframe is in a first uplink burst, and wherein the first uplink burst follows the at least one downlink burst;
• sending overlapping codebook indication information to the terminal device by using the communications module, wherein the overlapping codebook indication information is used by the terminal device to determine a second downlink subframe set associated with a second uplink subframe;
• and
• receiving, by using the communications module on a second uplink channel in the second uplink subframe, second feedback information sent by the terminal device, wherein the second uplink subframe is associated with the second downlink subframe set, wherein the second downlink subframe set belongs to the at least one downlink burst, wherein the first downlink subframe set is a subset of the second downlink subframe set, wherein the second feedback information is corresponding to downlink data in the second downlink subframe set, wherein the second uplink subframe is in the first uplink burst, and wherein the second uplink subframe follows the first uplink subframe.