Systems, methods and devices for legacy system fallback in a cellular communications system
US11019538B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2018 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | Jun 12, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W80/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
User equipment (UEs) can fallback to a legacy system, such as an evolved packet system (EPS), from a fifth generation system (5GS). For example, a UE camps on the 5GS network by default. When an indicator of a voice call is detected, the UE performs a fallback to EPS for a duration of the voice call. After the voice call, the UE can return to the 5GS. In another example, the UE detects an emergency session request (e.g., internet protocol multimedia subsystem (IMS) emergency session request). The UE performs a fallback to EPS for a duration of the emergency session. After the emergency session is complete, the UE can return to the 5GS. The solution can operate with UEs that operate in either Single Registration (SR) mode embodiments or Dual Registration (DR) mode embodiments. Depending on the embodiment, the UE can perform a handover or redirection to the legacy system (such as E-UTRAN).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.