Handoff for cellular and internet protocol telephony
US7502615B2 · kind B2 · utility
192Cited by
47References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2005 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Jul 18, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W92/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A telephone system supports communication with user devices over both a cellular radio network as well as over an Internet Protocol (IP) network, and enables roaming and active call handoff between cellular and IP domains. Components of the system interact with conventional cellular telephone systems, for example, by emulating behavior of control components, providing proxy services for conventional components, transporting cellular telephone control communication over IP connections, or by simulating cellular operating characteristics of user devices operating in an IP domain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.