The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 2022
Filed:
Jan. 23, 2017
Telefonaktiebolaget Lm Ericsson (Publ), Stockholm, SE;
Jerker Zetterlund, Bromma, SE;
Afshin Abtin, Sollentuna, SE;
Andreas Anulf, Lidingö, SE;
Jan Dahl, Älvsjö, SE;
Magnus Hallenstål, Täby, SE;
Ralf Keller, Würselen, DE;
Håkan Österlund, Ekerö, SE;
Telefonaktiebolaget LM Ericsson (Publ), Stockholm, SE;
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.