Transmission of data on multirate networks
US6047007A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1998 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Jan 21, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/181
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Mobile radio units communicate at a lower bit-rate than the conventional switching rate of a fixed network. Such calls are identified by mobile-to-mobile recognizers which identify characteristic bit streams and handle calls appropriately. An incoming mobile-to-mobile recognizer normally routes the call to a digital to A-law transcoder. An outgoing mobile-to-mobile recognizer normally routes calls to a high bit-rate digital to A-law transcoder. If a call is established between two mobile users the first--mobile-to-mobile recognizer diverts the signal received to a bit stuffer which provides three null bits for every bit received over the air interface. The null bits may be random numbers, but preferably include a recognizable pattern which can be detected by the second mobile-to-mobile recognizer. By such "bit sutffing" a 64 kbit/s signal can be generated from a 16 kbit/s signal with minimal signal processing and without the need to transcode to A-law and back.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.