GNSS validity report in IoT NTN

1 . An apparatus for wireless communication at a user equipment (UE), comprising:

memory; and

at least one processor coupled to the memory and configured to:

transmit, to a network entity, a report of a validity duration for global navigation satellite system (GNSS) tracking information, the GNSS tracking information being associated with a non-terrestrial network (NTN) including the UE and the network entity, the report including an indication of a remaining time period of the validity duration;

receive, from the network entity or a core network, an authorization to switch to a radio resource control (RRC) idle mode based on the remaining time period of the validity duration; and

switch to the RRC idle mode based on the received authorization to switch to the RRC idle mode based on the remaining time period of the validity duration, the RRC idle mode being switched to after an expiration of the remaining time period of the validity duration.

2 . The apparatus of claim 1 , wherein the indication comprises a first indication of a validity index associated with one or more predefined validity durations and a second indication of a reference point associated with a starting time of the validity duration.

3 . The apparatus of claim 2 , wherein the reference point comprises a system frame number (SFN) and the validity index is a closest validity index to the SFN.

4 . The apparatus of claim 1 , wherein the at least one processor is further configured to:

configure a validity index including one or more validity durations for the indication of the remaining time period of the validity duration, wherein the report of the validity duration includes the indication of the remaining time period of the validity duration indicative of the configured validity index.

5 . The apparatus of claim 1 , wherein the remaining time period of the validity duration is based on an output of a timing function indicative of the remaining time period of the validity duration.

6 . The apparatus of claim 1 , wherein, to transmit the report, the at least one processor is configured to:

transmit the report if the remaining time period of the validity duration crosses a threshold.

7 . The apparatus of claim 6 , wherein the threshold corresponds to a configuration of the validity duration, wherein, to transmit the report, the at least one processor is configured to:

transmit a medium access control (MAC)-control element (MAC-CE) comprising the report to indicate that the threshold is crossed based on the configuration of the validity duration.

8 . The apparatus of claim 1 , wherein to transmit the report, the at least one processor is configured to:

transmit an RRC message or a medium access control (MAC)-control element (MAC-CE) comprising the report.

9 . The apparatus of claim 1 , wherein the at least one processor is further configured to:

encrypt the report of the validity duration including the indication of the remaining time period of the validity duration via an access stratum (AS) message or a non-access stratum (NAS) message, wherein the report of the validity duration is encrypted prior to being transmitted to the network entity.

10 . The apparatus of claim 1 , wherein the UE autonomously switches to the RRC idle mode based on the report of the validity duration.

11 . The apparatus of claim 1 , wherein the at least one processor is further configured to:

delay the switch to the RRC idle mode after the expiration of the remaining time period of the validity duration based on at least one of an inactivity timer or a fixed time duration.

12 . The apparatus of claim 1 , further comprising at least one of an antenna or a transceiver coupled to the at least one processor, wherein the at least one processor is further configured to:

calculate the validity duration for the GNSS tracking information;

configure the report of the validity duration based on the calculated validity duration; and

transmit, via at least one of the antenna or the transceiver, the report to a radio resource control (RRC) entity to indicate the validity duration and expiry of the validity duration.

13 . An apparatus for wireless communication at a network entity, comprising:

memory; and

at least one processor coupled to the memory and configured to:

receive a report of a validity duration for global navigation satellite system (GNSS) tracking information associated with a user equipment (UE), the GNSS tracking information being associated with a non-terrestrial network (NTN) including the network entity and the UE, the report including an indication of a remaining time period of the validity duration;

configure, based on the report of the validity duration, a switch to a radio resource control (RRC) idle mode after an expiration of the remaining time period of the validity duration; and

transmit an authorization for the UE to switch to the RRC idle mode based on the configured switch.

14 . The apparatus of claim 13 , wherein the indication comprises a first indication of a validity index associated with one or more predefined validity durations and a second indication of a reference point associated with a starting time of the validity duration.

15 . The apparatus of claim 14 , wherein the reference point comprises a system frame number (SFN) and the validity index is a closest validity index to the SFN, wherein the at least one processor is further configured to:

determine the remaining time period based on the SFN and the validity index.

16 . The apparatus of claim 13 , wherein the report of the validity duration is associated with a configured validity index including one or more validity durations for the indication of the remaining time period of the validity duration, wherein the report of the validity duration includes the indication of the remaining time period of the validity duration indicative of the configured validity index.

17 . The apparatus of claim 13 , wherein the remaining time period of the validity duration is based on an output of a timing function indicative of the remaining time period of the validity duration.

18 . The apparatus of claim 13 , wherein, to receive the report, the at least one processor is configured to:

receive the report if the remaining time period of the validity duration crosses a threshold.

19 . The apparatus of claim 18 , wherein the threshold corresponds to a configuration of the validity duration, wherein to receive the report, the at least one processor is configured to:

receive a medium access control (MAC)-control element (MAC-CE) comprising the report based on the configuration of the validity duration.

20 . The apparatus of claim 13 , wherein, to receive the report based on the remaining time period of the validity duration being less than a threshold, the at least one processor is configured to:

receive an RRC message or a medium access control (MAC)-control element (MAC-CE) comprising the report.

21 . The apparatus of claim 13 , wherein the at least one processor is further configured to:

decrypt the report of the validity duration including the indication of the remaining time period of the validity duration, wherein the report of the validity duration is received via an access stratum (AS) message or a non-access stratum (NAS) message.

22 . The apparatus of claim 13 , further comprising at least one of an antenna or a transceiver coupled to the at least one processor, wherein the at least one processor is further configured to:

transmit, for the UE based on the report of the validity duration, via at least one of the antenna or the transceiver, the authorization for the UE to transition to the RRC idle mode.

23 . The apparatus of claim 13 , wherein the switch to the RRC idle mode is delayed after the expiration of the remaining time period of the validity duration based on at least one of an inactivity timer or a fixed time duration.

24 . A method of wireless communication at a user equipment (UE), comprising:

transmitting, to a network entity, a report of a validity duration for global navigation satellite system (GNSS) tracking information, the GNSS tracking information being associated with a non-terrestrial network (NTN) including the UE and the network entity, the report including an indication of a remaining time period of the validity duration;

receiving, from the network entity or a core network, an authorization to switch to a radio resource control (RRC) idle mode based on the remaining time period of the validity duration; and

switching to the RRC idle mode based on the received authorization to switch to the RRC idle mode based on the remaining time period of the validity duration, the RRC idle mode being switched to after an expiration of the remaining time period of the validity duration.

25 . The method of claim 24 , wherein the indication comprises a first indication of a validity index associated with one or more predefined validity durations and a second indication of a reference point associated with a starting time of the validity duration.

26 . The method of claim 25 , wherein the reference point comprises a system frame number (SFN) and the validity index is a closest validity index to the SFN.

27 . The method of claim 24 , further comprising:

configuring a validity index including one or more validity durations for the indication of the remaining time period of the validity duration, wherein the report of the validity duration includes the indication of the remaining time period of the validity duration indicative of the configured validity index.

28 . The method of claim 24 , wherein the remaining time period of the validity duration is based on an output of a timing function indicative of the remaining time period of the validity duration.

29 . A method of wireless communication at a network entity, comprising:

receiving a report of a validity duration for global navigation satellite system (GNSS) tracking information associated with a user equipment (UE), the GNSS tracking information being associated with a non-terrestrial network (NTN) including the network entity and the UE, the report including an indication of a remaining time period of the validity duration;

configuring, based on the report of the validity duration, a switch to a radio resource control (RRC) idle mode after an expiration of the remaining time period of the validity duration; and

transmitting an authorization for the UE to switch to the RRC idle mode based on the configured switch.