US2023048797A1PendingUtilityA1

Methods and apparatuses for hybrid automatic repeat request (harq)

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Assignee: ERICSSON TELEFON AB L MPriority: May 10, 2018Filed: Oct 27, 2022Published: Feb 16, 2023
Est. expiryMay 10, 2038(~11.8 yrs left)· nominal 20-yr term from priority
Inventors:Reem KarakiHavish KoorapatyJung-Fu ChengGen LiStephen GrantDaniel Chen Larsson
H04L 1/1896H04W 72/0453H04W 72/0446H04L 1/1819H04W 72/232H04L 1/1685H04W 72/1273H04L 1/1854H04W 72/23H04L 5/0055H04L 1/1822H04W 74/0808H04W 72/042
64
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Claims

Abstract

Methods and apparatuses are disclosed for Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK, feedback. In one embodiment, a method implemented in a wireless device, WD, comprises receiving, from a network node, a first Downlink Control Information, DCI, scheduling a physical downlink shared channel, PDSCH; and receiving, from the network node, a second DCI, the second DCI comprising a HARQ-ACK feedback request trigger triggering a HARQ-ACK feedback for the PDSCH scheduled by the first DCI. In another embodiment, a method implemented in a network node comprises transmitting a first Downlink Control Information, DCI, scheduling the PDSCH; and transmitting a second DCI, the second DCI comprising a HARQ-ACK feedback request trigger triggering a HARQ-ACK feedback for the PDSCH scheduled by the first DCI.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method implemented in a wireless device, WD, the method comprising:
 receiving a Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK, feedback request for a scheduled physical downlink shared channel, PDSCH; and   responsive to the received HARQ-ACK feedback request, communicating a HARQ-ACK feedback based at least in part on a size of a gap between an end of the PDSCH and a first uplink, UL, channel scheduled after the PDSCH.   
     
     
         2 . The method of  claim 1 , wherein the communicating the HARQ-ACK feedback further comprises communicating the HARQ-ACK feedback within a same channel occupancy time, COT, as the PDSCH based at least in part on the size the gap. 
     
     
         3 . The method of  claim 1 , wherein the communicating the HARQ-ACK feedback further comprises communicating the HARQ-ACK feedback in an unlicensed spectrum without first performing a listen-before-talk, LBT, procedure based at least in part on the size the gap. 
     
     
         4 . The method of  claim 1 , further comprising:
 receiving, from a network node, a configuration of whether to perform a listen-before-talk, LBT, procedure before communicating the HARQ-ACK feedback.   
     
     
         5 . The method of  claims 1 , further comprising:
 if the size of the gap at most meets a gap size threshold, communicating the HARQ-ACK feedback in an unlicensed spectrum without first performing a listen-before-talk, LBT, procedure; and   if the size of the gap exceeds the gap size threshold, communicating the HARQ-ACK feedback in the unlicensed spectrum after performing the LBT procedure.   
     
     
         6 . The method of  claim 1 , further comprising:
 receiving, from the network node, a configuration to perform a listen-before-talk, LBT, procedure for a fixed duration.   
     
     
         7 . The method of  claim 1 , wherein at least one of at least one downlink transmission that is not associated with HARQ feedback and at least one uplink transmission is scheduled within the gap. 
     
     
         8 . The method of  claim 1 , wherein the communicating the HARQ-ACK feedback further comprises:
 communicating the HARQ-ACK feedback according to a starting position of the HARQ-ACK feedback that is based at least in part on an outcome of a listen-before-talk, LBT, procedure.   
     
     
         9 . The method of  claim 1 , wherein the communicating the HARQ-ACK feedback further comprises:
 communicating the HARQ-ACK feedback according to a starting position of the HARQ-ACK feedback that is marked by a presence of a Demodulation Reference Signal, DMRS, immediately preceding the HARQ feedback.   
     
     
         10 . A method implemented in a network node, the method comprising:
 transmitting a Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK, feedback request for a scheduled physical downlink shared channel, PDSCH; and   as a result of the HARQ-ACK feedback request, receiving a HARQ-ACK feedback based at least in part on a size of a gap between an end of the PDSCH and a first uplink, UL, channel scheduled after the PDSCH.   
     
     
         11 . The method of  claim 10 , wherein the receiving the HARQ-ACK feedback further comprises receiving the HARQ-ACK feedback within a same channel occupancy time, COT, as the PDSCH based at least in part on the size the gap. 
     
     
         12 . The method of  claim 10 , further comprising:
 transmitting, to a wireless device, WD, a configuration of whether to perform a listen-before-talk, LBT, procedure before communicating the HARQ-ACK feedback.   
     
     
         13 . The method of  claim 10 , further comprising:
 configuring a wireless device, WD, to perform a listen-before-talk, LBT, procedure for a fixed duration.   
     
     
         14 . The method of  claim 10 , further comprising:
 scheduling at least one of at least one downlink transmission that is not associated with HARQ feedback and at least one uplink transmission within the gap.   
     
     
         15 . The method of  claim 10 , wherein the receiving the HARQ-ACK feedback further comprises:
 receiving the HARQ-ACK feedback according to a starting position of the HARQ-ACK feedback that is based at least in part on an outcome of a listen-before-talk, LBT, procedure.   
     
     
         16 . The method of  claim 10 , wherein the receiving the HARQ-ACK feedback further comprises:
 receiving the HARQ-ACK feedback according to a starting position of the HARQ-ACK feedback that is marked by a presence of a Demodulation Reference Signal, DMRS, immediately preceding the HARQ feedback.   
     
     
         17 . 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   responsive to the HARQ-ACK feedback request trigger, transmit the HARQ-ACK feedback for the PDSCH scheduled by the first DCI.   
     
     
         18 . The WD of  claim 17 , wherein the second DCI further comprises 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. 
     
     
         19 . The WD of  claim 17 , wherein the processing circuitry is further configured to:
 responsive to receiving the HARQ-ACK feedback request trigger in the second DCI, determine a HARQ codebook size based at least in part on a value in a Downlink Assignment Indicator, DAI, field in the first DCI.   
     
     
         20 . The WD of  claim 17 , wherein the processing circuitry is further configured to:
 perform a listen-before-talk, LBT, procedure in order to transmit the HARQ-ACK feedback in an unlicensed spectrum; and   determine a HARQ codebook size based at least in part on an LBT success.   
     
     
         21 . The WD of  claim 17 , wherein the HARQ-ACK feedback request trigger triggers the HARQ-ACK feedback based at least in part on a value in a Downlink Assignment Indicator, DAI, field in the DCI scheduling the PDSCH. 
     
     
         22 . 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 a Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK, feedback request for a scheduled physical downlink shared channel, PDSCH; and   responsive to the received HARQ-ACK feedback request, communicate a HARQ-ACK feedback based at least in part on a size of a gap between an end of the PDSCH and a first uplink, UL, channel scheduled after the PDSCH.   
     
     
         23 . The WD of  claim 22 , wherein the processing circuitry is further configured to cause the radio interface to communicate the HARQ-ACK feedback by being configured to cause the radio interface to:
 communicate the HARQ-ACK feedback within a same channel occupancy time, COT, as the PDSCH based at least in part on the size the gap.   
     
     
         24 . The WD of  claim 22 , wherein the processing circuitry is further configured to cause the radio interface to communicate the HARQ-ACK feedback by being configured to cause the radio interface to:
 communicate the HARQ-ACK feedback in an unlicensed spectrum without first performing a listen-before-talk, LBT, procedure based at least in part on the size the gap.   
     
     
         25 . The WD of  claim 22 , wherein the processing circuitry is further configured to cause the radio interface to:
 receive, from the network node, a configuration of whether to perform a listen-before-talk, LBT, procedure before communicating the HARQ-ACK feedback.   
     
     
         26 . The WD of  claim 22 , wherein the processing circuitry is further configured to cause the radio interface to communicate the HARQ-ACK feedback by being configured to cause the radio interface to:
 if the size of the gap at most meets a gap size threshold, communicate the HARQ-ACK feedback in an unlicensed spectrum without first performing a listen-before-talk, LBT, procedure; and   if the size of the gap exceeds the gap size threshold, communicate the HARQ-ACK feedback in the unlicensed spectrum after performing the LBT procedure.   
     
     
         27 . The WD of  claim 22 , wherein the processing circuitry is further configured to cause the radio interface to:
 receive, from the network node, a configuration to perform a listen-before-talk, LBT, procedure for a fixed duration.   
     
     
         28 . The WD of any of one of  claim 22 , wherein at least one of at least one downlink transmission that is not associated with HARQ feedback and at least one uplink transmission is scheduled within the gap. 
     
     
         29 . The WD of  claim 22 , wherein the processing circuitry is further configured to cause the radio interface to communicate the HARQ-ACK feedback by being configured to cause the radio interface to:
 communicate the HARQ-ACK feedback according to a starting position of the HARQ-ACK feedback, the starting position being based at least in part on an outcome of a listen-before-talk, LBT, procedure.   
     
     
         30 . The WD of  claim 22 , wherein the processing circuitry is further configured to cause the radio interface to communicate the HARQ-ACK feedback by being configured to cause the radio interface to:
 communicate the HARQ-ACK feedback according to a starting position of the HARQ-ACK feedback, the starting position being marked by a presence of a Demodulation Reference Signal, DMRS, immediately preceding the HARQ feedback.   
     
     
         31 . 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.   
     
     
         32 . The network node of  claim 31 , wherein the HARQ-ACK feedback request trigger comprises a bit map corresponding to configured HARQ processes the network node is requesting feedback for. 
     
     
         33 . The network node of  claim 31 , wherein the HARQ-ACK feedback request trigger is a field in the second DCI. 
     
     
         34 . The network node of  claim 31 , wherein the processing circuitry configured to cause the radio interface to transmit the second DCI by being configured to cause the radio interface to:
 transmit the second DCI comprising the HARQ-ACK feedback request trigger responsive to determining that an acknowledgement has not yet been received for at least a subset of configured HARQ processes.   
     
     
         35 . The network node of  claim 31 , wherein the HARQ-ACK feedback request trigger triggers HARQ-ACK feedback for all configured HARQ processes. 
     
     
         36 . The network node of  claim 31 , wherein the HARQ-ACK feedback request trigger comprises at least one of:
 an indication of a time resource in which the network node expects the triggered HARQ-ACK feedback;   an indication of a frequency resource on which the network node expects the triggered HARQ-ACK feedback; and   an indication of a carrier of which the network node expects the triggered HARQ-ACK feedback.   
     
     
         37 . The network node of  claim 31 , wherein the processing circuitry configured to cause the radio interface to transmit the second DCI by being configured to cause the radio interface to:
 transmit the second DCI comprising 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.   
     
     
         38 . The network node of  claim 31 , wherein the processing circuitry configured to cause the radio interface to:
 as a result of transmitting the HARQ-ACK feedback request trigger in the second DCI, receive the HARQ-ACK feedback having a HARQ codebook size based at least in part on a value in a Downlink Assignment Indicator, DAI, field in the first DCI.   
     
     
         39 . 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 cause the radio interface to:
 transmit a Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK, feedback request for a scheduled physical downlink shared channel, PDSCH; and   as a result of the HARQ-ACK feedback request, receive a HARQ-ACK feedback based at least in part on a size of a gap between an end of the PDSCH and a first uplink, UL, channel scheduled after the PDSCH.   
     
     
         40 . The network node of  claim 39 , wherein the processing circuitry is further configured to cause the radio interface to receive the HARQ-ACK feedback by being configured to cause the radio interface to:
 receive the HARQ-ACK feedback within a same channel occupancy time, COT, as the PDSCH based at least in part on the size the gap.   
     
     
         41 . The network node of any one of  claim 39 , wherein the processing circuitry is further configured to cause the radio interface to:
 transmit, to a wireless device, WD, a configuration of whether to perform an listen-before-talk, LBT, procedure before communicating the HARQ-ACK feedback.   
     
     
         42 . The network node of  claim 39 , wherein the processing circuitry is further configured to cause the radio interface to:
 schedule at least one of at least one downlink transmission that is not associated with HARQ feedback and at least one uplink transmission within the gap.   
     
     
         43 . The network node of  claim 39 , wherein the processing circuitry is further configured to cause the radio interface to:
 configure a wireless device, WD, to perform a listen-before-talk, LBT, procedure for a fixed duration.   
     
     
         44 . The network node of  claim 39 , wherein the processing circuitry is further configured to cause the radio interface to receive the HARQ-ACK feedback by being configured to cause the radio interface to:
 receive the HARQ-ACK feedback according to a starting position of the HARQ-ACK feedback that is based at least in part on an outcome of a listen-before-talk, LBT, procedure.   
     
     
         45 . The network node of  claim 39 , wherein the processing circuitry is further configured to cause the radio interface to receive the HARQ-ACK feedback by being configured to cause the radio interface to:
 receive the HARQ-ACK feedback according to a starting position of the HARQ-ACK feedback that is marked by a presence of a Demodulation Reference Signal, DMRS, immediately preceding the HARQ feedback.

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