Methods and apparatuses for hybrid automatic repeat request (HARQ)

A method implemented in a network node, the method comprising:

• determining scheduling for a physical downlink shared channel, PDSCH;
• transmitting a first Downlink Control Information, DCI, scheduling the PDSCH;
• and
• transmitting a second DCI, the second DCI comprising:
• a Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK, feedback request trigger triggering a HARQ-ACK feedback for the PDSCH scheduled by the first DCI;
• and
• at least two Downlink Assignment Indicator, DAI, values, a first DAI value assuming the HARQ-ACK feedback will be successfully decoded, and a second DAI value assuming the HARQ-ACK feedback will not be successfully decoded.

A wireless device, WD, configured to communicate with a network node, the WD comprising a radio interface and processing circuitry in communication with the radio interface, the processing circuitry configured to cause the radio interface to:

• receive, from a network node, a first Downlink Control Information, DCI, scheduling a physical downlink shared channel, PDSCH;
• receive, from the network node, a second DCI, the second DCI comprising:
• a Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK, feedback request trigger triggering a HARQ-ACK feedback for the PDSCH scheduled by the first DCI;
• and
• at least two Downlink Assignment Indicator, DAI, values, a first DAI value assuming the HARQ-ACK feedback will be successfully decoded, and a second DAI value assuming the HARQ-ACK feedback will not be successfully decoded;
• and
• responsive to the HARQ-ACK feedback request trigger, transmit the HARQ-ACK feedback for the PDSCH scheduled by the first DCI.

A network node configured to communicate with a wireless device, WD, the network node comprising a radio interface and processing circuitry in communication with the radio interface, the processing circuitry configured to:

• determine scheduling for a physical downlink shared channel, PDSCH;
• cause the radio interface to transmit a first Downlink Control Information, DCI, scheduling the PDSCH;
• and
• cause the radio interface to transmit a second DCI, the second DCI comprising:
• a Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK, feedback request trigger triggering a HARQ-ACK feedback for the PDSCH scheduled by the first DCI;
• and
• at least two Downlink Assignment Indicator, DAI, values, a first DAI value assuming the HARQ-ACK feedback will be successfully decoded, and a second DAI value assuming the HARQ-ACK feedback will not be successfully decoded.