Enhanced network slicing for public land mobile network selection while roaming

An apparatus configured for inclusion within a wireless user equipment device (UE), the apparatus comprising:

• a processor in communication with a non-transitory computer-readable memory medium, wherein the processor is configured to cause the UE to:
• transmit, while the UE is in a roaming scenario, a registration request to a visitor public land mobile network (VPLMN),
• receive a steering of roaming (SoR) container from the VPLMN in response to transmitting the registration request, wherein the SoR container comprises a mapping list including a mapping of a plurality of public land mobile networks (PLMNs) to one or more respective single network slice selection assistance information (S-NSSAI) values, wherein each S-NSSAI value of the S-NSSAI values is mapped to one or more PLMN identifiers (IDs), where each mapped PLMN ID corresponds to a PLMN that supports the network slice corresponding to the respective S-NSSAI value, and wherein the mapping list is organized by a priority of the PLMNs that support the respective one or more S-NSSAI values;
• determine, from the mapping list, an available PLMN of the plurality of PLMNs that supports a preferred S-NSSAI value of the UE.