Communication method and apparatus for reducing a retransmission process delay

A communication method, comprising:

• sending, by a network device, a first physical downlink shared channel (PDSCH) to a terminal device for decoding by the terminal device to determine, by the terminal device, whether a result of the decoding of data carried on the first PDSCH is correct;
• based the result of the decoding of the data carried on the first PDSCH being determined not to be correct, receiving, by the network device, feedback information of the first PDSCH from the terminal device, and the feedback information being negative acknowledgement information, and receiving, by the network device, a sounding reference signal (SRS) directly sent from the terminal device on a first time-frequency resource without waiting for scheduling from the network device to reduce time from unsuccessfully decoding the first PDSCH to a time the SRS is sent to the network device, and sending, by the network device, a retransmission of the first PDSCH to the terminal device using an adjusted retransmission parameter of the first PDSCH based on a result of a measurement of the SRS sent without waiting on rescheduling from the network device;
• and
• based the result of the decoding of the data carried on the first PDSCH being determined not to be correct, not receiving, by the network device, the feedback information of the first PDSCH from the terminal device, and receiving, by the network device, the SRS directly sent from the terminal device on the first time-frequency resource without waiting for the scheduling from the network device.

A communication apparatus, comprising:

• a memory, configured to store a computer program or instructions;
• a processor, connected to the memory;
• and
• a transceiver, configured to receive a first physical downlink shared channel (PDSCH) from a network device;
• wherein the processor is configured to execute computer-readable instructions to:
• receive, via the transceiver, a first physical downlink shared channel (PDSCH) from a network device, decode data carried on the first PDSCH to obtain a decoding result, determine whether the result of the decoding of the data carried on the first PDSCH is correct, reduce a transmission latency by directly sending, via the transceiver, a sounding reference signal (SRS) to the network device on a first time-frequency resource without waiting for scheduling from the network device to reduce time from unsuccessfully decoding the first PDSCH to a time the SRS is sent to the network device, and receive a retransmission of the first PDSCH from the network device using an adjusted retransmission parameter of the first PDSCH based on a result of a measurement of the SRS sent without waiting on rescheduling from the network device;
• and send, via the transceiver, feedback information of the first PDSCH to the network device in response to the result of the decoding by the processor of the data carried on the first PDSCH by the processor is correct, wherein the feedback information includes acknowledgement information.

A communication apparatus, comprising:

• a memory, configured to store a computer program or instructions;
• a processor coupled to the memory;
• and
• a transceiver;
• configured to send a first physical downlink shared channel (PDSCH) to a terminal device;
• and
• wherein the processor is configured to execute the computer program or instructions to:
• receive, via the transceiver, a first physical downlink shared channel (PDSCH) from a network device, decode data carried on the first PDSCH to obtain a decoding result, determine whether the result of the decoding of the data carried on the first PDSCH is correct, directly receive, via the transceiver, a sounding reference signal (SRS) sent from the terminal device on a first time-frequency resource without the terminal device waiting for scheduling on a first time-frequency resource to reduce time from unsuccessfully decoding the first PDSCH to a time the SRS is sent by the terminal device, and in response to feedback information of the first PDSCH being received from the terminal device indicating the result of the decoding by the terminal device of the data on the first PDSCH is determined to not be correct, the feedback information is negative acknowledgement information;
• and configured to receive the SRS from the terminal device on the first time-frequency resource in response to the feedback information of the first PDSCH not being received from the terminal device indicating the terminal device determined the result of the decoding of the data carried on the first PDSCH is incorrect.