Emergency call handling in a wireless communication system
US8509728B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2006 |
| Grant date | Aug 13, 2013 |
| Priority date | — |
| Expiry date | May 29, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
This disclosure describes techniques for efficiently handling emergency calls in a wireless communication system. The techniques are executed in a wireless communication device (WCD) that is interoperable between radio access technologies (RATs). For example, the WCD may support interoperability between the Global System for Mobile Communications (GSM) and the Universal Terrestrial Radio Access Network (UTRAN). Typically, the emergency call is redirected to another RAT or frequency following an unsuccessful emergency call. However, instead of searching only suitable cells on which to place the emergency call, a WCD that implements the described techniques searches acceptable cells of any public land mobile network and attempts to place the emergency call on the cell with the highest power. By placing the emergency call on the cell with the highest power, the techniques reduce delay in placing emergency calls by reducing the number of attempts required before successfully placing the emergency call.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.