Managing user equipment roaming status changes in a radio access network

US11323922B2 · kind B2 · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• Jerker Mattias Zetterlund · Bromma, SE
• Afshin Abtin · Sollentuna, SE
• Andreas Anulf · Lidingö, SE
• Jan Dahl · Ayacucho, PE
• Magnus Hallenstål · Täby, SE
• Ralf Keller · Würselen, DE
• Håkan Österlund · Ekerö, SE

Key dates

• Filing date: Jan 23, 2017
• Grant date: May 3, 2022
• Expiry date: Aug 6, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W48/18
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

When a user equipment is roaming in a visited network, mid-call handover from VoWiFi to VoLTE is controlled by policies enforced in the user equipment and the home network. An inter-operator policy and a subscription policy are stored in the home network and a user equipment policy is stored in the user equipment. The roaming user equipment registers in a visited network. Later, when mid-call handover to VoLTE on the visited network is desired, and also permitted by its user equipment policy, the user equipment sends a request containing a call-specific identifier which the responsible network entity in the home network compares with the registered handover parameter having regard to the inter-operator and subscription policies. If compliance with the policies is found, then the mid-call handover is proceeded with.