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1. (WO2019001750) A METHOD, NETWORK FUNCTIONS AND A COMPUTER PROGRAM PRODUCT FOR SUPPORTING THE HANDING OVER OF A USER EQUIPMENT, UE, FROM A FIRST TYPE OF RADIO ACCESS TECHNOLOGY, RAT, TO A SECOND TYPE OF RAT
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CLAI MS

1 . A method of handing over a User Equipment, UE, from a first type of Radio Access Technology, RAT, to a second type of RAT, wherein said UE is attached to a core network via a Radio Access Network, RAN, utilizing said first type of RAT, said method comprising the steps of:

receiving, by a Mobility Management node in said core network from a network function in said core network, an indication that a particular service is to be invoked for said UE;

- determining, by said Mobility Management node, that said U E is to be handed over from said first type of RAT to said second type of RAT for supporting said particular service;

requesting, by said Mobility Management node, said RAN to hand over said UE from said first RAT to said second RAT.

2. A method in accordance with claim 1 , wherein said method further comprises the initial step of:

subscribing, by said Mobility Management node, to said network function for receiving notifications whenever said particular service is to be invoked for said UE.

3. A method in accordance with any of the previous claims, wherein said method further comprises the step of:

informing, by said Mobility Management node, said network function that said U E is to be handed over from said first RAT to said second RAT for said particular service.

4. A method in accordance with any of the previous claims, wherein said method further comprises the steps of:

- receiving, from said RAN , a confirmation that said U E is handed over from said first RAT to said second RAT, said confirmation being a confirmation of mobility for said U E;

transmitting, to said network function, said confirmation.

5. A method in accordance with any of the previous claims, wherein said step of determining comprises:

determining, by said Mobility Management node, that said particular service requires a Quality of Service, QoS, that said first type of RAN is at least momentary not able to support.

6. A method in accordance with any of the previous claims, wherein said network function is any of:

Session Management Function + Packet gateway node;

- Policy Control Function, PCF, node;

Application Function, AF, node.

7. A method of supporting the handing over a User Equipment, UE, from a first type of Radio Access Technology, RAT, to a second type of RAT, wherein said UE is attached to a core network via a Radio Access Network, RAN, utilizing said first type of RAT, said method comprising the steps of:

receiving, by a network function in said core network, from a

Mobility Management node in said core network, a subscription request for receiving notifications whenever a particular service is to be invoked for said UE;

- determining, by said network function, that said particular service is to be invoked for said U E, and

transmitting, by said network function, to said Mobility

Management node, an indication that said particular service is to be invoked for said

UE.

8. A method in accordance with claim 7, wherein said method further comprises the step of:

receiving, by said network function, from said Mobility Management node, an information message that said UE is to be handed over from said first RAT to said second RAT for said particular service;

suspending, by said network function, establishment of said particular service to be invoked for said UE.

9. A method in accordance with claim 8, wherein said method further comprises the steps of:

receiving, by said network function, a confirmation that said U E is handed over from said first RAT to said second RAT, said confirmation being a confirmation of mobility for said U E;

unsuspending, by said network function, establishment of said particular service to be invoked for said UE.

10. A Mobility Management node arranged to operate in a core network and arranged for supporting handing over a User Equipment, U E, from a first type of Radio Access Technology, RAT, to a second type of RAT, wherein said UE is attached to a core network via a Radio Access Network, RAN, utilizing said first type of RAT, said Mobility Management node comprising:

receive equipment arranged for receiving from a network function in said core network, an indication that a particular service is to be invoked for said UE;

process equipment arranged for determining that said U E is to be handed over from said first type of RAT to said second type of RAT for supporting said particular service;

transmit equipment arranged for requesting said RAN to hand over said UE from said first RAT to said second RAT.

1 1 . A Mobility Management node in accordance with claim 10, wherein said node further comprises:

- subscribe equipment arranged for subscribing to said network function for receiving notifications whenever said particular service is to be invoked for said UE.

12. A Mobility Management node in accordance with any of the claims 10 - 1 1 , wherein said node further comprises:

inform equipment arranged for informing said network function that said UE is to be handed over from said first RAT to said second RAT for said particular service.

13. A Mobility Management node in accordance with any of the claims 10

- 12, wherein said receive equipment is further arranged for receiving from said RAN, a confirmation that said UE is handed over from said first RAT to said second RAT, and wherein said transmit equipment is further arranged for transmitting, to said network function, said confirmation.

14. A Mobility Management node in accordance with any of the claims 10

- 13, wherein said process equipment is further arranged for determining that said particular service requires a Quality of Service, QoS, that said first type of RAN is at least momentary not able to support.

15. A network function arranged for operating in a core network and arranged for supporting the handing over a User Equipment, UE, from a first type of Radio Access Technology, RAT, to a second type of RAT, wherein said UE is attached to a core network via a Radio Access Network, RAN, utilizing said first type of RAT, said network function comprising:

receive equipment arranged for receiving, from a Mobility Management node in said core network, a subscription request for receiving notifications whenever a particular service is to be invoked for said UE;

- process equipment arranged for determining that said particular service is to be invoked for said UE, and

transmit equipment arranged for transmitting an indication that said particular service is to be invoked for said UE.

16. A network function in accordance with claim 15, wherein said receive equipment is further arranged for receiving, from said Mobility Management node, an information message that said UE is to be handed over from said first RAT to said second RAT for said particular service, and wherein said node further comprises:

suspend equipment arranged for suspending establishment of said particular service to be invoked for said UE.

17. A network function in accordance with claim 16, wherein said receive equipment is further arranged for receiving a confirmation that said UE is handed over from said first RAT to said second RAT, and wherein said suspend equipment is further arranged for unsuspending said establishment of said particular service to be invoked for said UE.

18. A network function in accordance with any of the claims 15 - 17 wherein said node is any of:

Session Management Function + Packet gateway node;

Policy Control Function, PCF, node;

Application Function, AF, node.

19. Computer program product containing computer program code which , when executed processor, cause the processor to implement the method according to any of the claims 1 - 9.