Suspending services in a core network

1. A network entity stroing code for an access and mobility management function (“AMF”), comprising:

at least one memory storing the code; and

at least one processor coupled with the at least one memory and configured to execute the code to cause the AMF to:

receive, from a user equipment (“UE”) or a radio access network (“RAN”), a first message indicating a request to release a connection associated with the UE in a connected state and a set of paging restrictions associated with the UE;

release the UE from the connected state, wherein the release of the UE from the connected state indicates to refrain data transmission to the UE or store the set of paging restrictions; and

transmit, in response to the first message, a second message indicating an acceptance of the set of paging restrictions.

2. The network entity of claim 1 , wherein the at least one processor is further configured to execute the code to: cause the AMF to:

release, in response to the first message, a signaling association with the UE; and

release user plane network resources associated with a first mobile communication network.

3. The network entity of claim 2 , wherein, to release the UE from the connected state, the at least one processor is further configured to execute the code to cause the AMF to notify a session management network function in the first mobile communication network to release the user plane network resources.

4. The network entity of claim 1 , wherein the at least one processor is further configured to execute the code to cause the AMF to:

receive, from a session management function, a request to activate user plane network resources; and

transmit, to the session management function, a response indicating a rejection of the request to activate the user plane network resources, the response further indicating that the UE is not paged according to the set of paging restrictions.

5. The network entity of claim 1 , wherein the set of paging restrictions are applicable to services suspended in a serving cell.

6. The network entity of claim 1 , wherein the at least one processor is further configured to execute the code to cause the AMF to:

receive, from the UE, a third message comprising a registration request message indicating to resume a service associated with a first mobile communication network or a service request message indicating to resume a service associated with a first mobile communication network;

resume the connection in response to the third message; and

delete the set of paging restrictions in response to the third message.

7. The network entity of claim 6 ,

wherein the registration request includes a Protocol Data Unit (“PDU”) Session status indication of a PDU session corresponding to the connection; and

wherein, to resume the connection, the at least one processor is further configured to execute the code to cause the AMF to resume a service associated with the first mobile communication network based on the PDU Session status indication.

8. The network entity of claim 1 , wherein, to receive the first message, the at least one processor is further configured to execute the code to cause the AMF to receive a non-access stratum (“NAS”) mobility management (“MM”) message from the UE, the NAS MM message including a cause parameter that indicates that the UE is temporarily unreachable in a first mobile communication network.

9. The network entity of claim 1 , wherein, to receive the first message, the at least one processor is further configured to execute the code to cause the AMF to receive a context release request message from a radio access network, the context release request message requesting to release the UE to the an state.

10. The network entity of claim 9 , wherein the context release request message includes a cause parameter indicating a change to a second mobile communication network by the UE.

11. A method performed by an access and mobility management function (“AMF”), the method comprising:

receiving, from a user equipment (“UE”) or a radio access network (“RAN”), a first message indicating a request to release a connection associated with the UE in a connected state and a set of paging restrictions associated with the UE;

releasing the UE from the connected state, wherein the release of the UE from the connected state indicates to refrain data transmission to the UE or store the set of paging restrictions; and

transmitting, in response to the first message, a second message indicating an acceptance of the set of paging restrictions.

12. The method of claim 11 , further comprising:

releasing a signaling association with the UE in response to the first message; and

releasing user plane network resources associated with a first mobile communication network in response to the first message.

13. The method of claim 12 , wherein releasing the UE from the connected state comprises notifying a session management network function in the first mobile communication network that the UE is unreachable.

14. The method of claim 11 , further comprising:

receiving, from a session management function, a request to activate user plane network resources; and

transmitting, to the session management function, a response indicating a rejection of the request to activate the user plane network resources, the response further indicating that the UE is not pages according to the set of paging restrictions.

15. The method of claim 11 , wherein the set of paging restrictions are applicable to services suspended in a serving cell.

16. The method of claim 11 , further comprising:

receiving, from the UE, a third message comprising a registration request message indicating to resume a service associated with a first mobile communication network or a service request message indicating to resume a service associated with a first mobile communication network;

resuming the connection in response to the third message; and

deleting the set of paging restrictions in response to the third message.

17. The method of claim 16 ,

wherein the registration request message includes a Protocol Data Unit (“PDU”) Session status indication of a PDU session corresponding to the connection; and

wherein resuming the connection comprises resuming a service associated with the first mobile communication network based on the PDU Session status indication.

18. The method of claim 11 , wherein receiving the first message comprises receiving a non-access stratum (“NAS”) mobility management (“MM”) message from the UE, the NAS MM message including a cause parameter that indicates that the UE is temporarily unreachable in a first mobile communication network.

19. The method of claim 11 , wherein receiving the first message comprises receiving a context release request message from a radio access network, the context release request message requesting to release the UE to an idle state.

20. The method of claim 19 , wherein the context release request message includes a cause parameter indicating a change to a second mobile communication network by the UE.