Transmitting hybrid automatic repeat request acknowledgement in next generation networks
A method for transmitting a HARQ-ACK by a UE is provided. The method receives an SPS configuration. The method then receives a DCI format which activates the SPS configuration and also indicates a first offset for transmitting the HARQ-ACK. After receiving an SPS PDSCH associated with the SPS configuration in a first slot, the method identifies a second slot based on the first slot and the first offset for transmitting the HARQ-ACK. The method determines whether a first PUCCH for transmitting the HARQ-ACK is contained within uplink/flexible symbols of the second slot. When the first PUCCH is not contained within the uplink/flexible symbols and also a parameter that is included in the SPS configuration indicates a deferred HARQ transmission, the method identifies a third slot based on the first slot and a second offset and transmits the HARQ-ACK on a second PUCCH in the third slot.
1. A method for transmitting a Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK) by a user equipment (UE), the method comprising:
receiving a semi-persistent scheduling (SPS) configuration;
receiving a downlink control information (DCI) format indicating activation of the SPS configuration, the DCI format further indicating a first offset for transmitting a first HARQ-ACK;
receiving an SPS physical downlink shared channel (PDSCH) associated with the SPS configuration in a first slot;
identifying a second slot based on the first slot and the first offset for transmitting the first HARQ-ACK on a first physical uplink control channel (PUCCH) corresponding to the SPS PDSCH;
determining whether the first PUCCH is contained within one or more symbols in the second slot that are either uplink symbols or flexible symbols;
in response to determining that the first PUCCH is not contained within the one or more symbols in the second slot and a particular parameter included in the SPS configuration indicates a deferred HARQ transmission:
identifying a third slot based on the first slot and a second offset for transmitting the first HARQ-ACK on a second PUCCH corresponding to the SPS PDSCH, wherein the second offset is greater than the first offset and the second PUCCH is contained within one or more symbols in the third slot that are either uplink symbols or flexible symbols, and
transmitting the first HARQ-ACK on the second PUCCH in the third slot;
in response to determining that the first PUCCH is not contained within the one or more symbols in the second slot and the particular parameter does not indicate the deferred HARQ transmission, dropping the first HARQ-ACK;
receiving a second SPS configuration;
receiving a second DCI format activating the second SPS configuration, the second DCI format further indicating a third offset for transmitting a second HARQ-ACK;
receiving a second SPS PDSCH associated with the second SPS configuration in a fourth slot; and
in response to determining that the third slot that was previously identified for transmitting the first HARQ-ACK is also identified based on the fourth slot and the third offset for transmitting the second HARQ-ACK, transmitting, instead of the first HARQ-ACK on the second PUCCH in the third slot, the first HARQ-ACK and the second HARQ-ACK on a third PUCCH corresponding to the SPS PDSCH and the second SPS PDSCH in the third slot, wherein the third PUCCH is determined based on a payload size of the second HARQ-ACK and a payload size of the first HARQ-ACK.
2. The method of claim 1 , wherein the one or more symbols in the third slot are either semi static uplink symbols or semi static flexible symbols.
3. The method of claim 1 , wherein receiving the SPS configuration comprises receiving the SPS configuration via radio resource control (RRC) signaling.
4. The method of claim 1 , wherein the second offset is less than a maximum value that is included in the SPS configuration.
5. The method of claim 1 , further comprising, in response to determining that the first PUCCH is contained within the one or more symbols in the second slot, transmitting the first HARQ-ACK on the first PUCCH in the second slot irrespective of the particular parameter indicating the deferred HARQ transmission or not.
6. The method of claim 1 , wherein the second offset is determined based on identifying a particular slot earliest in time between the second slot and a maximum slot, wherein the particular slot includes enough number of uplink or flexible symbols for carrying the second PUCCH.
7. A user equipment (UE), comprising:
one or more non-transitory computer-readable media storing one or more computer-executable instructions for transmitting a Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK); and
at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the one or more computer-executable instructions to:
receive a semi-persistent scheduling (SPS) configuration;
receive a downlink control information (DCI) format indicating activation of the SPS configuration, the DCI format further indicating a first offset for transmitting a first HARQ-ACK;
receive an SPS physical downlink shared channel (PDSCH) associated with the SPS configuration in a first slot;
identify a second slot based on the first slot and the first offset for transmitting the first HARQ-ACK on a first physical uplink control channel (PUCCH) corresponding to the SPS PDSCH;
determine whether the first PUCCH is contained within one or more symbols in the second slot that are either uplink symbols or flexible symbols;
in response to determining that the first PUCCH is not contained within the one or more symbols in the second slot and a particular parameter included in the SPS configuration indicates a deferred HARQ transmission:
identify a third slot based on the first slot and a second offset for transmitting the first HARQ-ACK on a second PUCCH corresponding to the SPS PDSCH, wherein the second offset is greater than the first offset and the second PUCCH is contained within one or more symbols in the third slot that are either uplink symbols or flexible symbols, and
transmit the first HARQ-ACK on the second PUCCH in the third slot;
in response to determining that the first PUCCH is not contained within the one or more symbols in the second slot and the particular parameter does not indicate the deferred HARQ transmission, drop the first HARQ-ACK;
receive a second SPS configuration;
receive a second DCI format activating the second SPS configuration, the second DCI format further indicating a third offset for transmitting a second HARQ-ACK;
receive a second SPS PDSCH associated with the second SPS configuration in a fourth slot; and
in response to determining that the third slot that was previously identified for transmitting the first HARQ-ACK is also identified based on the fourth slot and the third offset for transmitting the second HARQ-ACK, transmit, instead of the first HARQ-ACK on the second PUCCH in the third slot, the first HARQ-ACK and the second HARQ-ACK on a third PUCCH corresponding to the SPS PDSCH and the second SPS PDSCH in the third slot, wherein the third PUCCH is determined based on a payload size of the second HARQ-ACK and a payload size of the first HARQ-ACK.
8. The UE of claim 7 , wherein the one or more symbols in the third slot are either semi static uplink symbols or semi static flexible symbols.
9. The UE of claim 7 , wherein receiving the SPS configuration comprises receiving the SPS configuration via radio resource control (RRC) signaling.
10. The UE of claim 7 , wherein the second offset is less than a maximum value that is included in the SPS configuration.
11. The UE of claim 7 , wherein the at least one processor is further configured to execute the one or more computer-executable instructions to, in response to determining that the first PUCCH is contained within the one or more symbols in the second slot, transmit the first HARQ-ACK on the first PUCCH in the second slot irrespective of the particular parameter indicating the deferred HARQ transmission or not.
12. The UE of claim 7 , wherein the second offset is determined based on identifying a particular slot earliest in time between the second slot and a maximum slot, wherein the particular slot includes enough number of uplink or flexible symbols for carrying the second PUCCH.