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1. (WO2017135858) RADIO NETWORK NODES AND METHODS PERFORMED THEREIN
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

A method performed by a first radio network node (12) for handling communication for a wireless device (10) in a communication network (1), which communication network (1) comprises a first core network and a second core network connected to one or more radio access networks with the first radio network node (12) and a second radio network node (16), wherein the communication network (1) comprises partitioned sets of functionalities wherein a first set of functionalities belongs to a first network slice, supporting the wireless device (10), of a first core network node (13) in the first core network, and a second set of functionalities belongs to a second network slice, supporting the wireless device (10), of a second core network node (14) in the second core network, and which first and second sets of functionalities are separated from one another and other sets of functionalities out of a total set of functionalities in the communication network (1); the method comprising:

connecting (1001) the wireless device (10) to the first core network node (13) for providing the first set of functionalities of the first network slice to the wireless device (10);

further connecting (1002) the wireless device (10) to the second core network node (14) for providing the second set of functionalities of the second network slice to the wireless device;

deciding (1003) to perform a handover of the wireless device (10) from the first radio network node (12) to the second radio network node (16) in the communication network (1); and

sending (1004) a request, to the second radio network node (16), for performing the handover of the wireless device (12), which request comprises an indication that the wireless device (10) is further connected to the second core network node (14).

A method according to claim 1 , wherein the request comprises a list of active connections for the wireless device to respective core network nodes, which list comprises the indication.

3. A method according to any of the claims 1-2 wherein the indication comprises an identity of the second core network node (14), an identity related to the wireless device in the second core network node and context of the wireless device.

A method according to any of the claims 1-3, wherein the handover is an X2 handover and the request is sent to the second radio network node (16) directly over an X2 interface and the request further comprises another indication that the wireless device is connected to the first core network node (13).

A method according to any of the claims 1-3, wherein the handover is an S1 handover and the request is sent to the second radio network node (16) via the first core network node (13) over an S1 association.

A method performed by a second radio network node (16) for handling

communication for a wireless device (10) in a communication network (1), which communication network (1) comprises a first core network and a second core network connected to one or more radio access networks with a first radio network node (12) and the second radio network node (16), wherein the communication network (1) comprises partitioned sets of functionalities wherein a first set of functionalities belongs to a first network slice, supporting the wireless device (10), of a first core network node (13) in the first core network, and a second set of functionalities belongs to a second network slice, supporting the wireless device (10), of a second core network node (14) in the second core network, and which first and second sets of functionalities are separated from one another and other sets of functionalities out of a total set of functionalities in the communication network (1); the method comprising:

receiving (1101) a request, from the first radio network node (12), for performing a handover of the wireless device to the second radio network node (16), which request comprises an indication that the wireless device is further connected to the second core network node (14); and

initiating (1103) a path switch to the second radio network node (16) for the second core network node (14) by transmitting, to the second core network node (14), a second request for path switching, which second request indicates the second radio network node (16) to perform the path switch to.

7. A method according to claim 6, further comprising

storing (1 102) the indication.

8. A method according to any of the claims 6-7, wherein the request comprises a list of active connections for the wireless device to respective core network nodes, which list comprises the indication.

A method according to any of the claims 6-8, wherein the indication comprises an identity of the second core network node (14), an identity related to the wireless device in the second core network node and context of the wireless device (10).

10. A method according to any of the claims 6-9, wherein the handover is an X2

handover and the request further comprises another indication that the wireless device is connected to the first core network node (13), and wherein the initiating (1 103) is triggered after successful X2 Handover and further comprises initiating an initial path switch to the second radio network node (16) for the first core network node (13) by transmitting, to the first core network node (13), an initial request for path switching, which initial request indicates the second radio network node (16) to perform the path switch to.

1 1. A method according to any of the claims 6-9, wherein the handover is an S1

handover and wherein the indication is received via the first core network node (13) and the initiating is triggered after successful S1 Handover.

12. A first radio network node (12) for handling communication for a wireless device (10) in a communication network (1), which communication network (1) comprises a first core network and a second core network connected to one or more radio access networks with the first radio network node (12) and a second radio network node (16), wherein the communication network (1) comprises partitioned sets of functionalities wherein a first set of functionalities belongs to a first network slice, supporting the wireless device (10), of a first core network node (13) in the first core network, and a second set of functionalities belongs to a second network slice, supporting the wireless device (10), of a second core network node (14) in the second core network, and which first and second sets of functionalities are separated from one another and other sets of functionalities out of a total set of functionalities in the communication network (1); the first radio network node (12) being configured to:

connect the wireless device (10) to the first core network node (13) for providing the first set of functionalities of the first network slice to the wireless device (10);

further connect the wireless device (10) to the second core network node (14) for providing the second set of functionalities of the second network slice to the wireless device;

decide to perform a handover of the wireless device (10) from the first radio network node (12) to the second radio network node (16) in the communication network (1); and to

send a request, to the second radio network node (16), for performing the handover of the wireless device (12), which request comprises an indication that the wireless device (10) is further connected to the second core network node (14).

13. A first radio network node (12) according to claim 12, wherein the request

comprises a list of active connections for the wireless device to respective core network nodes, which list comprises the indication.

14. A first radio network node (12) according to any of the claims 12-13 wherein the indication comprises an identity of the second core network node (14), an identity related to the wireless device (10) in the second core network node (14) and context of the wireless device (10).

15. A first radio network node (12) according to any of the claims 12-14, wherein the handover is an X2 handover and first radio network node (12) is configured to send the request to the second radio network node (16) directly over an X2 interface, and the request further comprises another indication that the wireless device is connected to the first core network node (13).

16. A first radio network node (12) according to any of the claims 12-15, wherein the handover is an S1 handover and the first radio network node (12) is configured to send the request to the second radio network node (16) via the first core network node (13) over an S1 association.

17. A second radio network node (16) for handling communication for a wireless

device (10) in a communication network (1), which communication network (1)

comprises a first core network and a second core network connected to one or more radio access networks with a first radio network node (12) and the second radio network node (16), wherein the communication network (1) comprises partitioned sets of functionalities wherein a first set of functionalities belongs to a first network slice, supporting the wireless device (10), of a first core network node (13) in the first core network, and a second set of functionalities belongs to a second network slice, supporting the wireless device (10), of a second core network node (14) in the second core network, and which first and second sets of functionalities are separated from one another and other sets of functionalities out of a total set of functionalities in the communication network (1); the second radio network node (16) is configured to:

receive a request, from the first radio network node (12), for performing a handover of the wireless device (10) to the second radio network node (16), which request comprises an indication that the wireless device is further connected to the second core network node (14); and to

initiate a path switch to the second radio network node (16) for the second core network node (14) by being configured to transmit, to the second core network node (14), a second request for path switching, which second request indicates the second radio network node (16) to perform the path switch to.

18. A second radio network node (16) according to claim 17, further being configured to store the indication.

19. A second radio network node (16) according to any of the claims 17-18, wherein the request comprises a list of active connections for the wireless device to respective core network nodes, which list comprises the indication.

20. A second radio network node (16) according to any of the claims 17-19, wherein the indication comprises an identity of the second core network node (14), an identity related to the wireless device in the second core network node (14), and context of the wireless device (10).

21. A second radio network node (16) according to any of the claims 17-20, wherein the handover is an X2 handover and the request further comprises another indication that the wireless device (10) is connected to the first core network node (13), and wherein the second radio network node (16) is configured to initiate the path switch after successful X2 Handover and further configured to initiate an initial path switch to the second radio network node (16) for the first core network node (13) by being configured to transmit, to the first core network node (13), an initial request for path switching, which initial request indicates the second radio network node (16) to perform the path switch to.

22. A second radio network node (16) according to any of the claims 17-20, wherein the handover is an S1 handover and the second radio network node (16) is configured to receive the indication via the first core network node (13) and configured to initiate the path switch after successful S1 Handover.

23. A computer program comprising instructions, which, when executed on at least one processor, cause the at least one processor to carry out any of the methods according to any of the claims 1-1 1 , as performed by the first radio network node or the second radio network node.

24. A computer-readable storage medium, having stored thereon a computer program comprising instructions which, when executed on at least one processor, cause the at least one processor to carry out the method according to any of the claims 1-1 1 , as performed by the first radio network node or the second radio network node.