Emergency calls for internet protocol multimedia subsystem (IMS) over packet switched code division multiple access (CDMA) networks
US8315589B2 · kind B2 · utility
16Cited by
3References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2009 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Dec 25, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/90
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A mobile communication device receives initiation of an emergency call by a user of the mobile communication device, and determines whether a single-carrier radio transmission technology (1xRTT) network is available for the emergency call. The mobile communication device also routes the emergency call over the 1xRTT network when the 1xRTT network is available for the emergency call, and routes the emergency call over an enhanced high rate packet data (eHRPD) network when the 1xRTT network is unavailable for the emergency call.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.