IMS node and method performed therein

An Internet Protocol, IP, multimedia system, IMS node for handling data of a user equipment, UE, in a communication network, wherein the communication network comprises partitioned sets of functionalities of one or more core networks wherein each set of functionalities belongs to a network slice, wherein the IMS node is configured to:

• receive a message for registering the UE to an IMS of the IMS node, wherein the message comprises a slice indication indicating a network slice identity and a UE indication identifying the UE;
• store a registration of the UE in the IMS node, in addition to a previously stored registration of the UE, with a proviso that the indicated network slice identity differs from a previous network slice identity of the previously stored registration of the UE and thereby allowing parallel active communications using the registration and the previously stored registration;
• identify the UE based on the received UE indication;
• and
• compare the network slice identity with the previous network slice identity to determine that the indicated network slice identity differs from the previous network slice identity of the previously stored registration of the UE.

A non-transitory 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:

• receive a message for registering a User Equipment, UE, to an Internet Protocol, IP, multimedia system, IMS, of an IMS node, wherein the message comprises a slice indication indicating a network slice identity and a UE indication identifying the UE;
• store a registration of the UE in the IMS node, in addition to a previously stored registration of the UE, with a proviso that the indicated network slice identity differs from a previous network slice identity of the previously stored registration of the UE and thereby allowing parallel active communications using the registration and the previously stored registration;
• identify the UE based on the received UE indication;
• and
• compare the network slice identity with the previous network slice identity to determine that the indicated network slice identity differs from the previous network slice identity of the previously stored registration of the UE.