Interworking function for enabling VoLTE roaming
US11350251B2 · kind B2 · utility
1Cited by
2References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2021 |
| Grant date | May 31, 2022 |
| Priority date | — |
| Expiry date | Feb 17, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
This invention is a system and method for implementing a VoLTE and circuit switched voice and SMS interworking function to provide voice and SMS service to roaming mobile devices at visiting network based on VoLTE roaming and ‘SMS over SGs’ towards VPLMN, and circuit-switched voice and SMS towards HPLMN. The interworking function enables and redirects IMS traffic at VPLMN towards a hosted IMS core with voice connectivity to PSTN via MGCF and MGW. The interworking function also performs circuit-switched location-update registration at HLR at HPLMN for receiving mobile-terminated voice calls and SMS.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.