Monitoring paging messages and small data transmission
A method for a user equipment (UE) to monitor paging messages is provided. The method monitors, while the UE is in an Idle mode, a physical paging channel (PPCH) for receiving paging messages associated with the UE from a serving radio access network (RAN). The method receives one or more paging messages associated with the UE while monitoring the PPCH. The method then determines, whether the one or more paging messages are received during a small data transmission (SDT) procedure. The method further determines whether to terminate the SDT procedure or not after determining that the one or more paging messages are received during the SDT procedure.
1. A method performed by a user equipment (UE) for monitoring paging messages, the method comprising:
monitoring, while the UE is in an Idle mode, a physical paging channel (PPCH) for receiving paging messages associated with the UE from a serving radio access network (RAN);
receiving one or more paging messages associated with the UE while monitoring the PPCH;
initiating, while the UE is in the Idle mode, a small data transmission (SDT) procedure;
monitoring, during the SDT procedure, a paging occasion (PO) to obtain one or more short messages from paging downlink control information (DCI); and
refraining from decoding a paging record associated with the paging DCI after the UE decodes the DCI for obtaining the one or more short messages during the SDT procedure.
2. The method of claim 1 , wherein the one or more paging messages comprise at least one of a serving core network (CN) paging message or a serving RAN paging message.
3. The method of claim 2 , wherein monitoring the PPCH for receiving the one or more paging messages associated with the UE comprises monitoring the PPCH for receiving only serving CN paging messages and not serving RAN paging messages.
4. The method of claim 3 , wherein:
the one or more paging messages associated with the UE comprise at least one serving CN paging message that includes a fifth generation (5G)-Serving-Temporary Mobile Subscriber Identity (TMSI) (5G-S-TMSI) configured by the serving CN and at least one serving RAN paging message that includes an Inactive-Radio Network Temporary Identifier (I-RNTI) configured by the serving RAN, and
monitoring the PPCH for receiving only the serving CN paging messages comprises decoding the 5G-S-TMSI in the at least one CN paging message and ignoring the I-RNTI.
5. The method of claim 1 , wherein the SDT procedure comprises one of a Configured-Grant Small Data Transmission (CG-SDT) procedure or a Random Access Small Data Transmission (RA-SDT) procedure.
6. A user equipment (UE), comprising:
at least one processor; and
at least one non-transitory computer-readable medium coupled to the at least one processor and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the UE to:
monitor, while the UE is in an Idle mode, a physical paging channel (PPCH) for receiving paging messages associated with the UE from a serving radio access network (RAN);
receive one or more paging messages associated with the UE while monitoring the PPCH;
initiate, while the UE is in the Idle mode, a small data transmission (SDT) procedure;
monitor, during the SDT procedure, a paging occasion (PO) to obtain one or more short messages from paging downlink control information (DCI); and
refrain from decoding a paging record associated with the paging DCI after the UE decodes the DCI for obtaining the one or more short messages during the SDT procedure.
7. The UE of claim 6 , wherein the one or more paging messages comprise at least one of a serving core network (CN) paging message or a serving RAN paging message.
8. The UE of claim 7 , wherein monitoring the PPCH for receiving the one or more paging messages associated with the UE comprises monitoring the PPCH for receiving only serving CN paging messages and not serving RAN paging messages.
9. The UE of claim 8 , wherein:
the one or more paging messages associated with the UE comprise at least one serving CN paging message that includes a fifth generation (5G)-Serving-Temporary Mobile Subscriber Identity (TMSI) (5G-S-TMSI) configured by the serving CN and at least one serving RAN paging message that includes an Inactive-Radio Network Temporary Identifier (I-RNTI) configured by the serving RAN, and
monitoring the PPCH for receiving only the serving CN paging messages comprises decoding the 5G-S-TMSI in the at least one CN paging message and ignoring the I-RNTI.
10. The UE of claim 6 , wherein the SDT procedure comprises one of a Configured-Grant Small Data Transmission (CG-SDT) procedure or a Random Access Small Data Transmission (RA-SDT) procedure.
11. The method of claim 1 , wherein the one or more short messages comprise at least one of a system information update indication, a stop paging monitoring indication, an earthquake and tsunami warning system (ETWS) indication, or a commercial mobile alerting system (CMAS) indication.
12. The UE of claim 6 , wherein the one or more short messages comprise at least one of a system information update indication, a stop paging monitoring indication, an earthquake and tsunami warning system (ETWS) indication, or a commercial mobile alerting system (CMAS) indication.