System and method for performing an inter mobile system handover using the internet telephony system
US6424638B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1999 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | May 21, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/0066
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A telecommunications system and method is disclosed for utilizing an Internet telephony system to perform a handover of a call between different types of systems. When a serving mobile switching center (MSC) determines that there is not another MSC belonging to the same type of wireless system to which a handover can be performed, the serving MSC sends a message to an Internet Gatekeeper via an Internet Gateway for the serving MSC, inquiring whether there are any other types of wireless systems nearby. The Internet Gatekeeper maintains a database of all existing wireless systems within the area served by the Internet Gatekeeper. The Internet Gatekeeper chooses a target MSC of another wireless system (if possible), and transmits the identity of this target MSC back to the currently serving MSC. Thereafter, the currently serving MSC performs the handover to the target MSC by routing signaling messages through the Internet Gateway and the Internet Gatekeeper to the target MSC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.