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1. WO2021043417 - CONNECTION SUSPENSION FOR MULTIPLE SIMS

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[ EN ]

CLAIMS

1. An apparatus comprising:

a first subscriber identity module (“SIM”) registered with a first mobile communication network;

a second SIM registered with a second mobile communication network;

a transceiver that communicates with the first and second mobile communication networks; and

a processor that:

receives a communication trigger associated with the first SIM, the communication trigger indicating a service type;

determines whether to apply a short connection suspension for the second SIM or a long connection suspension for the second SIM, said determination based on the service type; and

applies one of the short connection suspension and the long connection suspension for the second SIM.

2. The apparatus of claim 1, wherein an application or service type associated with the first SIM is configured with higher priority than an application or service currently in use with the second SIM.

3. The apparatus of claim 1, wherein applying the short connection suspension for the second SIM comprises transmitting a radio resource control (“RRC”) layer suspension request, and wherein applying the long connection suspension for the second SIM comprises transmitting a non-access-stratum (“NAS”) layer suspension request.

4. The apparatus of claim 3, wherein applying the long connection suspension for the second SIM further comprises: transitioning to an NAS idle state in response to reception of a suspension response message from the second network, wherein the suspension response message comprises one or more of: a RRC layer message or NAS layer message, the suspension response message sent as response to the NAS layer suspension request message.

5. The apparatus of claim 3, wherein applying the short connection suspension further comprises the processor disabling transmissions for the second SIM in response to receiving an RRC layer suspension response.

6. The apparatus of claim 3, wherein applying the short connection suspension comprises the processor maintaining an Access Stratum (“AS”) context for the second SIM.

7. The apparatus of claim 3, wherein the transceiver further receives a suspension timer value associated with the short connection suspension for the second SIM, wherein the processor initiates the suspension timer in response to receiving the RRC layer suspension response and transitions from the short connection suspension to the long connection suspension in response to expiry of the suspension timer.

8. The apparatus of claim 1, wherein registering the first SIM and the second SIM comprises:

indicating support for one or more of the following parameters: multi-SIM enhancements, the short connection suspension, or long connection suspension;

receiving a network preference indicating whether to apply multi-SIM enhancements, or the short connection suspension, or long connection suspension;

configuring the processor whether to apply multi-SIM enhancements, or the short connection suspension, or long connection suspension based on the received network preference.

9. The apparatus of claim 1, wherein the processor further:

activates a connection associated with the first SIM;

performs communication corresponding to the communication trigger;

sends release assistance information in response to ending the communication corresponding to the communication trigger, the release assistance information comprising one or more of: Access Stratum (“AS”) release assistance information and Non-Access Stratum (“NAS”) release assistance information.

10. The apparatus of claim 9, wherein the processor further resumes the suspended connection in the second communication network associated with the second SIM in response to ending the communication corresponding to the communication trigger.

11. The apparatus of claim 10, wherein resuming the suspended connection comprises one or more of: sending a radio resource control (“RRC”) layer connection resume request in response to transmitting the RRC layer suspension request; and sending a NAS layer resume request in response to transmitting the NAS layer suspension request.

12. The apparatus of claim 1, wherein the processor determines not to suspend the connection for the second SIM if the second SIM is involved in emergency communication session.

13. The apparatus of claim 1, wherein determining whether to apply a short connection suspension for the second SIM or a long connection suspension for the second SIM is further based on a bearer type associated with the second SIM, wherein the processor determines to apply the long connection suspension in response to the second SIM being associated with a guaranteed bit rate bearer.

14. A method comprising:

registering a first subscriber identity module (“SIM”) with a first mobile communication network;

registering a second SIM with a second mobile communication network; receiving a communication trigger associated with the first SIM, the communication trigger indicating a service type;

determining whether to apply a short connection suspension for the second SIM or a long connection suspension for the second SIM, said determination based on the service type; and

applying one of the short connection suspension and the long connection suspension for the second SIM.

15. An apparatus comprising:

a transceiver that receives a radio resource control (“RRC layer”) suspension request for short connection suspension from a user equipment (“UE”); and a processor that:

maintains a user equipment access stratum (“UE AS”) context for the UE; disables downlink transmissions to the UE in response to the RRC layer suspension request; and

enables downlink transmissions to the UE in response to receiving an RRC layer connection resume request from the UE.

16. The apparatus of claim 15, wherein the transceiver further transmits a suspension timer value associated with the short connection suspension for the second SIM, wherein the processor releases the UE AS context in response to expiry of the suspension timer.

17. The apparatus of claim 16, wherein the transceiver further indicates a type of suspend state to the UE, wherein the UE is to transition to the indicated suspend state in response to expiry of the suspension timer.

18. The apparatus of claim 15, wherein the processor further buffers downlink packets for the UE in response to the RRC layer suspension request, wherein the transceiver attempts to deliver the buffered downlink packets in response to receiving the RRC layer connection resume request from the UE.

19. The apparatus of claim 15, wherein the processor further suppresses a radio access network (“RAN”) paging procedure for the UE in response to receiving the RRC layer suspension request and stops suppressing the RAN paging procedure for the UE in response to receiving the RRC layer connection resume request.

20. A method comprising:

receiving an RRC layer suspension request for short connection suspension from a user equipment (“UE”);

maintaining a user equipment access stratum (“UE AS”) context for the UE; disabling downlink transmissions to the UE in response to the radio resource control (“RRC”) layer suspension request; and

enabling downlink transmissions to the UE in response to receiving an RRC layer connection resume request from the UE.