HARQ-ACK transmission supporting multi-cell scheduling
Various embodiments herein provide techniques for hybrid automatic repeat request (HARQ)-acknowledgement (ACK) transmission with multi-cell scheduling (e.g., of physical downlink shared channels (PDSCHs) and/or physical uplink shared channels (PUSCHs). For example, embodiments include mechanisms for HARQ-ACK feedback timing determination, and formatting of HARQ-ACK feedback. Other embodiments may be described and claimed.
1 . One or more non-transitory computer-readable media (NTCRM) having instructions, stored thereon, that when executed by one or more processors of a user equipment (UE) configure the UE to:
detect a downlink control information (DCI) to schedule multiple physical downlink shared channels (PDSCHs), wherein the respective PDSCHs are to be transmitted from different cells and include different transport blocks (TBs), and wherein the DCI indicates one or more K1 values;
determine an uplink resource for hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the PDSCHs based on the one or more K1 values and a reference PDSCH corresponding to a last uplink slot or sub-slot among the multiple PDSCHs, including to determine an effective K1 value based on at least one of the one or more K1 values and a time domain offset between the multiple PDSCHs, wherein the uplink resource is determined based on the effective K1 value; and
encode the HARQ-ACK feedback for transmission in the determined uplink resource.
2 . The one or more NTCRM of claim 1 , wherein the reference channel is a reference PDSCH of the PDSCHs.
3 . The one or more NTCRM of claim 2 , wherein the instructions, when executed, are further to configure the UE to identify the reference PDSCH as:
the PDSCH of the multiple PDSCHs that has a last ending symbol;
the PDSCH of the multiple PDSCHs that is associated with a last uplink slot or sub-slot;
the PDSCH of the multiple PDSCHs that has a last-ending boundary of a downlink slot;
the PDSCH of the multiple PDSCHs that has a smallest or largest subcarrier spacing;
the PDSCH of the multiple PDSCHs that has a smallest or largest serving cell index; or
the PDSCH of the multiple PDSCHs that is on a configured reference cell.
4 . The one or more NTCRM of claim 1 , wherein the reference channel is a physical downlink control channel (PDCCH) that carries the DCI.
5 . The one or more NTCRM of claim 1 , wherein the one or more K1 values correspond to a slot or sub-slot offset from the reference channel.
6 . The one or more NTCRM of claim 1 , wherein the DCI indicates a plurality of K1 values that correspond to respective groups of one or more of the PDSCHs.
7 . The one or more NTCRM of claim 1 , wherein the instructions, when executed, are further to configure the UE to determine an effective K1 value based on the one or more indicated K1 values, wherein the uplink resource is determined based on the effective K1 value.
8 . The one or more NTCRM of claim 7 , wherein the one or more K1 values indicated by the DCI is a set of K1 values, and wherein the effective K1 for the PDSCHs scheduled by the DCI is within the set of K1 values.
9 . The one or more NTCRM of claim 1 , wherein to encode the HARQ-ACK feedback for transmission in the determined uplink resource includes to determine HARQ-ACK bit locations based on an effective K1 value and time domain resources of the PDSCHs.
10 . The one or more NTCRM of claim 9 , wherein the time domain resources of the PDSCHs are determined based on a valid Start and the set of Length Indication Value (SLIV) in time domain resource allocation (TDRA) configured for respective serving cells for single and/or multi-cell scheduling.
11 . The one or more NTCRM of claim 1 , wherein the instructions, when executed, are further to configure the UE to receive a configuration of a search space set of a DCI format for multi-cell scheduling, wherein the DCI is detected in the search space set.
12 . The one or more NTCRM of claim 1 , wherein the HARQ-ACK feedback is based on a Type-1 HARQ codebook, a Type-2 HARQ-ACK codebook, or a Type-3 HARQ-ACK codebook.
13 . One or more non-transitory computer-readable media (NTCRM) having instructions, stored thereon, that when executed by one or more processors of a next generation Node B (gNB) configure the gNB to:
encode, for transmission to a user equipment (UE), a downlink control information (DCI) to schedule multiple physical downlink shared channels (PDSCHs), wherein the respective PDSCHs are to be transmitted from different cells and include different transport blocks (TBs), and wherein the DCI indicates one or more K1 values;
identify an uplink resource for hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the PDSCHs based on the one or more K1 values and a reference PDSCH corresponding to a last uplink slot or sub-slot among the multiple PDSCHs, including to identify an effective K1 value based on at least one of the one or more K1 values and a time domain offset between the multiple PDSCHs, wherein the uplink resource is identified based on the effective K1 value; and
receive the HARQ-ACK feedback from the UE in the uplink resource.
14 . The one or more NTCRM of claim 13 , wherein the reference channel is a reference PDSCH of the PDSCHs.
15 . The one or more NTCRM of claim 14 , wherein the instructions, when executed, are further to configure the gNB to identify the reference PDSCH as:
the PDSCH of the multiple PDSCHs that has a last ending symbol;
the PDSCH of the multiple PDSCHs that is associated with a last uplink slot or sub-slot;
the PDSCH of the multiple PDSCHs that has a last-ending boundary of a downlink slot;
the PDSCH of the multiple PDSCHs that has a smallest or largest subcarrier spacing;
the PDSCH of the multiple PDSCHs that has a smallest or largest serving cell index; or
the PDSCH of the multiple PDSCHs that is on a configured reference cell.
16 . The one or more NTCRM of claim 13 , wherein the reference channel is a physical downlink control channel (PDCCH) that carries the DCI.
17 . The one or more NTCRM of claim 13 , wherein the one or more K1 values correspond to a slot or sub-slot offset from the reference channel.
18 . The one or more NTCRM of claim 13 , wherein the DCI indicates a plurality of K1 values that correspond to respective groups of one or more of the PDSCHs.
19 . The one or more NTCRM of claim 13 , wherein the instructions, when executed, are further to configure the gNB to identify an effective K1 value based on the one or more indicated K1 values, wherein the uplink resource is identified based on the effective K1 value.
20 . The one or more NTCRM of claim 13 , wherein the HARQ-ACK feedback is based on a Type-1 HARQ codebook, a Type-2 HARQ codebook, or a Type-3 HARQ codebook.