Method and system for recognizing call switch-over from 1xEV-DO system to 1X system
US7609675B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2003 |
| Grant date | Oct 27, 2009 |
| Priority date | — |
| Expiry date | Jul 11, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The system in accordance with the present invention recognizes in real time that a call connection of a hybrid access terminal be switched over to a 1X system, by sending an inquiry message inquiring the hybrid access terminal of whether the hybrid access terminal has received voice signal or a low-rate data signal and by receiving a confirmation message that the hybrid access terminal has received the voice signal or the low-rate data signal from a mobile switching center, if a low-level signal below a prescribed level is received from the hybrid access terminal while counting time initiated from a point of a call drop while the hybrid access terminal is being provided with a multimedia service.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.