Communications system
US7142881B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2003 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | Apr 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W28/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
When communications between mobile terminals MS1 and MS2 are terminated, a TRAU1 judges whether the communications between mobile terminals MS1 and MS2 are synchronous and notifies the mobile terminal MS1 of this information through both a base station control center BSC1 and a base station BTS. The mobile terminal MS1 stores this information in relation to both the dial number of the mobile terminal MS2 and a voice-encoding type used in communications with the mobile terminal MS2. Similarly, a TRAU2 transmits the same information to the mobile terminal MS2 and the mobile terminal MS2 stores this information along with the dial number of the mobile terminal MS1 and a voice-encoding type. When the mobile terminals MS1 and MS2 communicate the second time, communications are conducted using another voice-encoding type if the communications are asynchronous and using the previous voice-encoding type if the communications are synchronous, based on the information stored in this way.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.