Fallback indicators in session initiation protocol (SIP) signaling
US10492243B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2018 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Mar 6, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A user equipment (UE) and an Internet Protocol (IP) Multimedia Subsystem (IMS) node may exchange fallback indicators in SIP signaling for purposes of controlling fallback procedures implemented by the UE. By sending fallback indicators to an IMS node in a SIP request, a UE is able to inform the IMS node of its capabilities in regards to particular fallback radio access technologies (RATs) that are supported by the UE. The IMS node may respond to the UE with a SIP response that includes information indicating which of the supported Fallback RATs the UE is authorized to use (if any), and which of the supported Fallback RATs the UE is not authorized to use (if any). In this way, the IMS node can control a fallback procedure at the UE by indicating which Fallback RATs are usable by the UE to reattempt communication sessions that cannot be established on an existing RAT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.