Consideration for uplink control information (UCI) multiplexing across different priorities
Certain aspects of the present disclosure provide techniques for processing physical downlink shared channel (PDSCH) transmissions scheduled with non-numeric timing feedback indicators.
1. A method for wireless communications by a user equipment (UE), comprising:
receiving a downlink grant for at least a first physical downlink shared channel (PDSCH) transmission of a first service type;
receiving an uplink grant for an uplink transmission of a second service type; and
multiplexing acknowledgment feedback for the first PDSCH transmission of the first service type in the uplink transmission of the second service type, if one or more conditions are met, wherein:
the first service type comprises enhanced mobile broadband (eMBB) and the second service type comprises ultra-reliable low-latency communications (URLLC); and
the one or more conditions include a condition that a gap between:
an end of a physical downlink control channel (PDCCH) carrying the uplink grant; and
an earliest symbol of a physical uplink control channel (PUCCH) corresponding to the PDSCH transmission of the first service type or the uplink transmission of the second service type is at least a threshold time.
2. The method of claim 1 , wherein the UE is configured to apply different processing times when processing traffic of the first and second service types.
3. The method of claim 1 , wherein the threshold time is based on at least one of:
a first parameter corresponding to a number of symbols for UE processing from an end of the PDSCH transmission to an earliest start of the acknowledgment feedback;
a second parameter corresponding to a number of symbols from an end of the PDCCH carrying the uplink grant to an earliest start of the uplink transmission plus an additional number of one or more symbols; or
a third parameter corresponding to a minimum time for the UE to switch reporting acknowledgment feedback from a first uplink resource to a second uplink resource.
4. The method of claim 3 , wherein the one or more conditions include at least one of:
a condition that a serving cell in which the PDSCH transmission is sent is configured with a same or higher processing capability as a serving cell in which the uplink transmission is sent;
a condition that a payload size of a codebook for providing acknowledgment feedback for the first service type is less than or equal to a threshold size; or
a condition that the UE is not configured to provide acknowledgment feedback for the first and second service types using different types of codebooks.
5. The method of claim 4 , further comprising receiving a configuration to bundle acknowledgment feedback for all PDSCH transmissions on a given CC in a single bit.
6. The method of claim 4 , further comprising providing a single bit of acknowledgment feedback for all CCs if the UE only receives a single PDCCH with a total downlink assignment index (DAI) and counter DAI field are both set to one.
7. The method of claim 3 , further comprising receiving a configuration to bundle acknowledgment feedback for multiple PDSCH transmissions on a per component carrier (CC) basis.
8. A method for wireless communications by a user equipment (UE), comprising:
receiving a downlink grant for at least a first physical downlink shared channel (PDSCH) transmission of a first service type; and
multiplexing acknowledgment feedback for the first PDSCH transmission of the first service type in an uplink transmission of a second service type, if one or more conditions are met, wherein:
the first service type comprises ultra-reliable low-latency communications (URLLC) and the second service type comprises enhanced mobile broadband (eMBB);
the one or more conditions allow the downlink grant to come after an uplink grant for the uplink transmission; and
the one or more conditions include a condition that an end of a physical downlink control channel (PDCCH) carrying the downlink grant comes at least a threshold number of symbols before an earliest symbol for a physical uplink control channel (PUCCH) corresponding to the PDSCH transmission of the first service type or the uplink transmission of the second service type.
9. The method of claim 8 , wherein the one or more conditions comprise the UE is configured to determine a codebook for multiplexing acknowledgment feedback for the first PDSCH transmission in the uplink transmission based on:
a first codebook for acknowledgment feedback corresponding to downlink grants that came earlier than the uplink grant;
a second codebook to account for missing grants, if any, between a last received downlink grant before the uplink grant and reception of the uplink grant; and
acknowledgment feedback corresponding to any downlink grants that came after the uplink grant.
10. The method of claim 8 , wherein:
the downlink grant that comes after the uplink grant includes a beta-factor value that determines a number of physical uplink shared channel (PUSCH) resources for transmitting the acknowledgment feedback; and
one or more conditions include a condition that the UE is to apply the beta-factor value when multiplexing the acknowledgment feedback for the first PDSCH transmission in the uplink transmission.
11. A method for wireless communications by a user equipment (UE), comprising:
receiving a downlink grant for at least a first physical downlink shared channel (PDSCH) transmission of a first service type; and
multiplexing acknowledgment feedback for the first PDSCH transmission in an uplink transmission of a second service type, if one or more conditions are met wherein:
the uplink transmission of the second service type comprises a physical uplink control channel (PUCCH); and
multiplexing acknowledgment feedback for the first PDSCH transmission of the first service type in the uplink transmission of the second service type comprises at least one of:
providing the acknowledgment feedback for the PDSCH transmission of the first service type based, at least in part, on a downlink assignment index (DAI) value received in a transmission of the second service type; or
providing the acknowledgment feedback for the PDSCH transmission of the first service type based, at least in part, on a last received downlink DAI value, regardless of which service type of the transmission in which it is received.
12. The method of claim 11 , wherein the one or more conditions include at least one of:
a condition that a ratio between a payload size of a codebook for providing acknowledgment feedback for the first service type and a payload size of a codebook for providing acknowledgment feedback for the first service type is less than or equal to a first threshold size;
a condition that a total combined payload size of a codebook for providing acknowledgment feedback for the first service type and a payload size of a codebook for providing acknowledgment feedback for the first service type is less than or equal to a threshold size; or
a condition that at least one of the codebook for providing acknowledgment feedback for the first service type or the codebook for providing acknowledgment feedback for the first service type is not semi-static.
13. A method for wireless communications by a network entity, comprising:
sending a downlink grant to a user equipment (UE) for at least a first physical downlink shared channel (PDSCH) transmission of a first service type;
sending an uplink grant for an uplink transmission of a second service type; and
processing acknowledgment feedback for the first PDSCH transmission from the UE multiplexed in the uplink transmission of the second service type, if one or more conditions are met, wherein the one or more conditions include a condition that a gap between:
an end of a physical downlink control channel (PDCCH) carrying the uplink grant; and
an earliest symbol of a physical uplink control channel (PUCCH) corresponding to the PDSCH transmission of the first service type or the uplink transmission of the second service type is at least a threshold time.
14. The method of claim 13 , wherein the threshold time is based on at least one of:
a first parameter corresponding to a number of symbols for UE processing from an end of the PDSCH transmission to an earliest start of the acknowledgment feedback;
a second parameter corresponding to a number of symbols from an end of the PDCCH carrying the uplink grant to an earliest start of the uplink transmission plus an additional number of one or more symbols; or
a third parameter corresponding to a minimum time for the UE to switch reporting acknowledgment feedback from a first uplink resource to a second uplink resource.
15. The method of claim 13 , wherein the one or more conditions include at least one of:
a condition that a serving cell in which the PDSCH transmission is sent is configured with a same or higher processing capability as a serving cell in which the uplink transmission is sent;
a condition that a payload size of a codebook for providing acknowledgment feedback for the first service type is less than or equal to a threshold size; or
a condition that the UE is not configured to provide acknowledgment feedback for the first and second service types using different types of codebooks.
16. The method of claim 13 , further comprising sending the UE a configuration to bundle acknowledgment feedback for multiple PDSCH transmissions on a per component carrier (CC) basis.
17. The method of claim 16 , further comprising transmitting a configuration to the UE to bundle acknowledgment feedback for all PDSCH transmission on a given CC in a single bit.
18. The method of claim 17 , further comprising transmitting a configuration to the UE to provide a single bit of acknowledgment feedback for all CCs if the UE only receives a single PDCCH with a total downlink assignment index (DAI) and counter DAI field are both set to one.
19. A method for wireless communications by a network entity, comprising:
sending a downlink grant to a user equipment (UE) for at least a first physical downlink shared channel (PDSCH) transmission of a first service type; and
processing acknowledgment feedback for the first PDSCH transmission from the UE multiplexed in an uplink transmission of a second service type, if one or more conditions are met, wherein:
the one or more conditions allow the downlink grant to come after an uplink grant for the uplink transmission; and
the one or more conditions include a condition that an end of a physical downlink control channel (PDCCH) carrying the downlink grant comes at least a threshold number of symbols before an earliest symbol for a physical uplink control channel (PUCCH) corresponding to the PDSCH transmission of the first service type or the uplink transmission of the second service type.
20. The method of claim 19 , wherein the one or more conditions comprise the UE is configured to determine a codebook for multiplexing acknowledgment feedback for the first PDSCH transmission in the uplink transmission based on:
a first codebook for acknowledgment feedback corresponding to downlink grants that came earlier than the uplink grant;
a second codebook to account for missing grants, if any, between a last received downlink grant before the uplink grant and reception of the uplink grant; and
acknowledgment feedback corresponding to any downlink grants that came after the uplink grant.
21. The method of claim 19 , wherein:
the downlink grant that comes after the uplink grant includes a beta-factor value that determines a number of physical uplink shared channel (PUSCH) resources for transmitting the acknowledgment feedback; and
one or more conditions include a condition that the UE is to apply the beta-factor value when multiplexing the acknowledgment feedback for the first PDSCH transmission in the uplink transmission.
22. A method for wireless communications by a network entity, comprising:
sending a downlink grant to a user equipment (UE) for at least a first physical downlink shared channel (PDSCH) transmission of a first service type; and
processing acknowledgment feedback for the first PDSCH transmission from the UE multiplexed in an uplink transmission of a second service type, if one or more conditions are met, wherein:
the uplink transmission of the second service type comprises a physical uplink control channel (PUCCH); and
the acknowledgment feedback comprises acknowledgment feedback for the PDSCH transmissions of the first service type based, at least in part, on a downlink assignment index (DAI) value received in a transmission of the second service type, or
the acknowledgment feedback comprises acknowledgment feedback for the PDSCH transmissions of the first service type based, at least in part, on a last received DAI value, regardless of which service type of the transmission in which it is received.
23. The method of claim 22 , wherein the one or more conditions include at least one of:
a condition that a ratio between a payload size of a codebook for providing acknowledgment feedback for the first service type and a payload size of a codebook for providing acknowledgment feedback for the first service type is less than or equal to a first threshold size;
a condition that a total combined payload size of a codebook for providing acknowledgment feedback for the first service type and a payload size of a codebook for providing acknowledgment feedback for the first service type is less than or equal to a threshold size; or
a condition that at least one of the codebook for providing acknowledgment feedback for the first service type or the codebook for providing acknowledgment feedback for the first service type is not semi-static.
24. An apparatus for wireless communications by a user equipment (UE), comprising:
means for receiving a downlink grant for at least a first physical downlink shared channel (PDSCH) transmission of a first service type;
means for receiving an uplink grant for an uplink transmission of a second service type; and
means for multiplexing acknowledgment feedback for the first PDSCH transmission of the first service type in the uplink transmission of the second service type, if one or more conditions are met, wherein:
the first service type comprises enhanced mobile broadband (eMBB) and the second service type comprises ultra-reliable low-latency communications (URLLC); and
the one or more conditions include a condition that a gap between:
an end of a physical downlink control channel (PDCCH) carrying the uplink grant; and
an earliest symbol of a physical uplink control channel (PUCCH) corresponding to the PDSCH transmission of the first service type or the uplink transmission of the second service type is at least a threshold time.
25. An apparatus for wireless communications by a network entity, comprising:
means for sending a downlink grant to a user equipment (UE) for at least a first physical downlink shared channel (PDSCH) transmission of a first service type;
means for sending an uplink grant for an uplink transmission of a second service type; and
means for processing acknowledgment feedback for the first PDSCH transmission from the UE multiplexed in the uplink transmission of the second service type, if one or more conditions are met, wherein the one or more conditions include a condition that a gap between:
an end of a physical downlink control channel (PDCCH) carrying the uplink grant; and
an earliest symbol of a physical uplink control channel (PUCCH) corresponding to the PDSCH transmission of the first service type or the uplink transmission of the second service type is at least a threshold time.