Communication terminal apparatus, network system and handover method
US8170564B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2006 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Dec 21, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2207/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication terminal apparatus wherein even if there occurs a dropout or overtaking of call control messages, the current service can be continued without increasing the load of an apparatus such as a server in the network. In this apparatus, a VoIP call control part (103) performs call controls including both a call establishment of a VoIP telephone conversation using a wireless LAN system and a call disconnection thereof. A line switching call control part (104) performs call controls including both a call establishment of a line switching telephone conversation using a mobile communication (cellular) system and a call disconnection thereof. A handover part (105) determines the reception quality of the wireless LAN system and that of the mobile communication (cellular) system and controls, based on the determination results, the handover between the wireless LAN system and the mobile communication (cellular) system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.