US 12,652,519 B2 · Steering of roaming in 5G systems

Abstract

Systems and methods of providing steering of roaming (SOR) information in a 5G VPLMN are described. A UE receives a REGISTRATION ACCEPT message from an AMF of the VPLMN during initial or mobility registration of the UE in the VPLMN and DL NAS TRANSPORT message thereafter. The message has a Payload container information element (IE) set to secured packet. The SOR information indicates a list of preferred PLMN/access technology combinations, which is uploaded to a memory after a successful security check to verify that the list of preferred PLMN/access technology combinations is provided by the UDM of the HPLMN and is not tampered with by the VPLMN. When the message also contains a request for acknowledgment of successful security check of the list of preferred PLMN/access technology combinations, the UE transmits to the AMF the acknowledgment in a REGISTRATION COMPLETE or a DL NAS TRANSPORT message.

Claims20

Dependent claims

An apparatus, comprising:

a processor configured to, when executing instructions stored in a memory, cause a Unified Data Management (UDM) of a home public land mobile network (HPLMN) to perform operations comprising:
transmitting steering of roaming information to an Access and Mobility Function (AMF) of a visited public land mobile network (VPLMN) for delivery to a universal subscriber identity module (USIM) of a user equipment (UE) in a downlink non-access stratum (DL NAS) TRANSPORT message after registration,
wherein the DL NAS TRANSPORT message comprises an indication set to “0 1 0 0” indicating that the DL NAS TRANSPORT message includes a secured packet for delivery to the USIM.

Dependencies are inferred from the claim text.

Steering of roaming in 5G systems

Life of this patent

Steering of roaming in 5G systems

Life of this patent

Abstract

Claims20