Method and apparatus for transmission timing enhancement for different numerologies in NTN

1. A user equipment (UE), comprising:

one or more non-transitory computer-readable media storing one or more computer-executable instruction; and

at least one processor coupled to the one or more non-transitory computer-readable media, the at least one processor configured to execute the one or more computer-executable instructions to:

receive downlink control information (DCI) on a downlink (DL) channel in a non-terrestrial network (NTN), the DL channel being received in a first slot; and

perform an uplink (UL) transmission on a UL channel of the NTN in a second slot separated from the first slot by a timing offset, wherein:

in a case where the DCI is to trigger at least one aperiodic Sounding Reference Signal (SRS) transmission:

the UL transmission includes the at least one triggered aperiodic SRS transmission in at least one triggered aperiodic SRS resource set, and

a duration of the timing offset is determined based on a combination of ( ) a subcarrier spacing of the at least one triggered aperiodic SRS transmission, ii a subcarrier spacing of the DL channel, (iii) a configured offset value that is configured through RRC signaling to indicate a slot for the at least one triggered aperiodic SRS transmission, and (iv) an additional offset that is added to a required timing advance (TA) to compensate for a processing delay due to operation in the NTN.

2. The UE of claim 1 , wherein:

the DL channel is a Physical Downlink Control Channel (PDCCH);

the UL channel is a Physical Uplink Control Channel (PUCCH);

the UL transmission includes a Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK); and

the HARQ-ACK on the PUCCH is transmitted on the second slot └n·2 μ PUCCH −μ PDCCH ┘+K 1 +K offset , wherein:

the PDCCH is received in the first slot n,

μ PUCCH is a subcarrier spacing of the PUCCH,

μ PDCCH is a subcarrier spacing of the PDCCH,

K 1 is an offset value indicated in the DCI, and

K offset is the additional offset.

3. The UE of claim 1 , wherein:

the DL channel is a Physical Downlink Control Channel (PDCCH);

the UL channel is a Physical Uplink Shared Channel (PUSCH); and

the UL transmission on the PUSCH is scheduled by the DCI, and is transmitted on the second slot └n·2 μ PUCCH −μ PDCCH ┘+K 2 +K offset , wherein:

the PDCCH is received in the first slot n,

μ PUSCH is a subcarrier spacing of the PUSCH,

μ PDCCH is a subcarrier spacing of the PDCCH,

K 2 is an offset value based on a numerology of the PUSCH, and

K offset is an offset.

4. The UE of claim 1 , wherein:

the DL channel is a Physical Downlink Control Channel (PDCCH);

the UL channel is a Physical Uplink Shared Channel (PUSCH);

the UL transmission includes Channel State Information (CSI); and

the CSI on the PUSCH is transmitted on the second slot └n·2 μ PUCCH −μ PDCCH ┘+K+K offset , wherein:

the PDCCH is received in the first slot n,

μ PUSCH is a subcarrier spacing of the PUSCH,

μ PDCCH is a subcarrier spacing of the PDCCH,

K is an offset value indicated in the DCI, and

K offset is the additional offset.

5. The UE of claim 1 , wherein:

the UL transmission includes Channel State Information (CSI); and

a CSI reference resource is provided in the DL channel in the first slot n−n CSI_ref where the

n

=

⌊

(

n

′

-

K

offset

)

·

2

μ

DL

2

μ

UL

⌋

,

wherein:

n CSI_ref is an offset value determined by the UE,

the CSI transmission is in the second slot n′,

μ DL is a subcarrier spacing of the DL channel,

μ UL is a subcarrier spacing of the UL channel, and

K offset is the additional offset.

6. The UE of claim 1 , wherein:

the DL channel is a Physical Downlink Control Channel (PDCCH); and

the UL transmission includes the at least one triggered aperiodic SRS transmission in the at least one triggered aperiodic SRS resource set in the second slot

⌊

n

·

2

μ

SRS

μ

PDCCH

⌋

+

k

+

K

offset

,

wherein:

the DCI received in the first slot n triggers the at least one aperiodic SRS transmission,

μ SRS is the subcarrier spacing of the at least one triggered aperiodic SRS transmission,

μ PDCCH is the subcarrier spacing of the PDCCH,

K is the configured offset value indicated in the DCI, and

K offset is the additional offset.

7. The UE of claim 1 , wherein:

the DL channel is a Physical Downlink Shared Channel (PDSCH) having a Random Access Response (RAR) message ending in the first slot n;

the RAR message is in response to a Physical Random Access Channel (PRACH) preamble transmitted by the UE;

the UL channel is a Physical Uplink Shared Channel (PUSCH);

the UL transmission includes at one transport block (TB); and

the TB on the PUSCH is transmitted in the second slot n′+K 2 +Δ+K offset , where n′=└n·2 μ PUCCH −μ PDCCH ┘, wherein:

μ PUSCH is a subcarrier spacing of the PUSCH,

μ PDSCH is a subcarrier spacing of the PDSCH,

K 2 is an offset value based on a numerology of the PUSCH,

Δ is an additional subcarrier spacing specific slot delay value for a first transmission of the PUSCH scheduled by the RAR message, and

K offset is the additional offset.

8. A method performed by a user equipment (UE), the method comprising:

receiving downlink control information (DCI) on a downlink (DL) channel in a non-terrestrial network (NTN), the DL channel being received in a first slot; and

performing an uplink (UL) transmission on a UL channel of the NTN in a second slot separated from the first slot by a timing offset, wherein:

in a case where the DCI is to trigger at least one aperiodic Sounding Reference Signal (SRS) transmission:

the UL transmission includes the at least one triggered aperiodic SRS transmission in at least one triggered aperiodic SRS resource set, and

a duration of the timing offset is determined based on a combination of (i) a subcarrier spacing of the at least one triggered aperiodic SRS transmission, Lila subcarrier spacing of the DL channel, (iii) a configured offset value that is configured through RRC signaling to indicate a slot for the at least one triggered aperiodic SRS transmission, and (iv) an additional offset that is added to a required timing advance (TA) to compensate for a processing delay due to operation in the NTN.

9. The method of claim 8 , wherein:

the DL channel is a Physical Downlink Control Channel (PDSCH);

the UL channel is a Physical Uplink Control Channel (PUCCH);

the UL transmission includes a Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK); and

the HARQ-ACK on the PUCCH is transmitted on the second slot └n·2 μ PUCCH −μ PDCCH ┘+K 1 +K offset , wherein:

the PDCCH is received in the first slot n,

μ PUCCH is a subcarrier spacing of the PUCCH,

μ PDCCH is a subcarrier spacing of the PDCCH,

K 1 is an offset value indicated in the DCI, and

K offset is the additional offset.

10. The method of claim 8 , wherein:

the DL channel is a Physical Downlink Control Channel (PDCCH);

the UL channel is a Physical Uplink Shared Channel (PUSCH); and

the UL transmission on the PUSCH is scheduled by the DCI, and is transmitted on the second slot └n·2 μ PUCCH −μ PDCCH ┘+K 2 +K offset , wherein:

the PDCCH is received in the first slot n,

μ PUSCH is a subcarrier spacing of the PUSCH,

μ PDCCH is a subcarrier spacing of the PDCCH,

K 2 is an offset value based on a numerology of the PUSCH, and

K offset is the additional offset.

11. The method of claim 8 , wherein: K offset , wherein:

the DL channel is a Physical Downlink Control Channel (PDCCH);

the UL channel is a Physical Uplink Shared Channel (PUSCH);

the UL transmission includes Channel State Information (CSI); and

the CSI on the PUSCH is transmitted on slot └n·2 μ PUCCH −μ PDCCH ┘+K+K offset , wherein

the PDCCH is received in the first slot n,

μ PUSCH is a subcarrier spacing of the PUSCH,

μ PDCCH is a subcarrier spacing of the PDCCH,

K is an offset value indicated in the DCI, and

K offset is the additional offset.

12. The method of claim 8 , wherein:

the UL transmission includes Channel State Information (CSI); and

a CSI reference resource is provided in the DL channel in the first slot n−n CSI_ref , where

n

=

⌊

(

n

′

-

K

offset

)

·

2

μ

DL

2

μ

UL

⌋

,

wherein:

n CSI_ref is an offset value determined by the UE,

the CSI transmission is in the second slot if,

μ DL is a subcarrier spacing of the DL channel,

μ UL is a subcarrier spacing of the UL channel, and

K offset is the additional offset.

13. The method of claim 8 , wherein:

the DL channel is a Physical Downlink Control Channel (PDCCH); and

the UL transmission includes the at least one triggered aperiodic SRS transmission in the at least one triggered aperiodic SRS resource set in the second slot

⌊

n

·

2

μ

SRS

μ

PDCCH

⌋

+

k

+

K

offset

,

wherein:

the DCI received in the first slot n triggers the at least one aperiodic SRS transmission,

μ SRS is the subcarrier spacing of the at least one triggered aperiodic SRS transmission,

μ PDCCH is the subcarrier spacing of the PDCCH,

K is the configured offset value indicated in the DCI, and

K offset is the additional offset.

14. The method of claim 8 , wherein:

the DL channel is a Physical Downlink Shared Channel (PDSCH) having a Random Access Response (RAR) message ending in the first slot n;

the RAR message is in response to a Physical Random Access Channel (PRACH) preamble transmitted by the UE;

the UL channel is a Physical Uplink Shared Channel (PUSCH);

the UL transmission includes at one transport block (TB); and

the TB on the PUSCH is transmitted in the second slot n′+K 2 +Δ+K offset , where n′=└n·2 μ PUCCH −μ PDCCH ┘, wherein:

μ PUSCH is a subcarrier spacing of the PUSCH,

μ PDSCH is a subcarrier spacing of the PDSCH,

K 2 is an offset value based on a numerology of the PUSCH,

Δ is an additional subcarrier spacing specific slot delay value for a first transmission of the PUSCH scheduled by the RAR message, and

K offset is the additional offset.