Method for communications between mobile units using single and multiple switching center configurations
US5608779A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1994 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Nov 8, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/181
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Communication systems having single switching center configurations (100) or multiple switching center configurations (200) detect the occurrence of a mobile-to-mobile call using control messages. When it is determined that the call is mobile-to-mobile, a switching center (101) in the single switching center configuration instructs transcoders (121-123) to operate in a transparent mode. Likewise, when it is determined that the call is mobile-to-mobile, multiple switching centers (201-203) the multiple switching center configuration instruct transcoders (221-223) to operate in the transparent mode. While operating in the transparent mode, the transcoders do not convert compressed digital voice (402) to non-compressed digital voice (401) and vice versa, but do allow the compressed digital voice to pass through as bit-stuffed compressed digital voice (403) and vice versa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.