Slice selection subscription data enhancement

A method performed by a core network node in a core network of a communication system additionally comprising a Unified Data Management, UDM, node in the core network the method comprising:

• receiving, from a wireless device, a registration request that includes a user identity and one or more requested Single Network Slice Selection Assistance Information, S-Nssais, for identifying and accessing at least one network slice;
• obtaining from the UDM node, enhanced slice selection subscription data for the wireless device, the enhanced slice selection subscription data indicating a list of default S-Nssais and a list of non-default S-Nssais, and indicating for each S-Nssai in the list of default S-Nssais and in the list of non-default S-Nssais whether said each S-Nssai is subject to network slice-specific authentication and authorization or not;
• determining, based on the enhanced slice selection subscription data, that slice-specific authentication and authorization is required for at least one requested S-Nssai;
• and then
• sending towards an Authentication, Authorization and Accounting, AAA, server, a slice-specific authentication and authorization request for each of the at least one requested S-Nssai;
• receiving from the AAA server, an authorization response to the slice-specific authentication and authorization request for each of the at least one requested S-Nssai, the authorization response indicating whether the wireless device is registered to access the respective network slice;
• and
• sending, to the wireless device, a registration response for at least a first one of the at least one network slice.

A core network node in a core network of a communication system additionally comprising a Unified Data Management, UDM, node in the core network, the core network node configured to:

• receive, from a wireless device, a registration request that includes a user identity and one or more requested Single Network Slice Selection Assistance Information, S-Nssais, for identifying and accessing at least one network slice;
• obtain from the UDM node, enhanced slice selection subscription data for the wireless device, the enhanced slice selection subscription data indicating a list of default S-Nssais and a list of non-default S-Nssais, and indicating for each S-Nssai in the list of default S-Nssais and in the list of non-default S-Nssais whether said each S-Nssai is subject to network slice-specific authentication and authorization or not;
• determine, based on the enhanced slice selection subscription data, that slice-specific authentication and authorization is required for at least one requested S-Nssai;
• and then
• send towards an Authentication, Authorization and Accounting, AAA, server, a slice-specific authentication and authorization request for each of the at least one requested S-Nssai;
• receiving from the AAA server, an authorization response to the slice-specific authentication and authorization request for each of the at least one requested S-Nssai, the authorization response indicating whether the wireless device is registered to access the respective network slice;
• and
• send, to the wireless device, a registration response for at least a first one of the at least one network slice.