Communication protocol for mobile earth terminal communication device used in mobile satellite communication system
US5850602A · kind A · utility
Inventors
Key dates
| Filing date | May 28, 1996 |
| Grant date | Dec 15, 1998 |
| Priority date | — |
| Expiry date | May 28, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a mobile satellite system, a method of performing a call setup procedure from a call initiated by a mobile communication system (MCS) to a destination served by a public switched telephone network, includes the steps of initiating the call by the MCS, the MCS formatting and transmitting an access request message via a random access channel, and receiving by the central controller the access request message, and transmitting frequency assignments to the MCS and to the SCSO. The method also includes receiving by the MCS the frequency assignment, transmitting a scrambling vector message to the SCSO, and verifying by the SCSO the identity of the MET responsive to the scrambling vector. Upon successful verification, the method includes the steps of switching by the SCSO and the MCS from call setup mode to voice mode, transmitting by the SCSO voices frames to the MCS and disabling voice activation in the MCS for at least 3 super frames, and transmitting a destination number to the PSTN. The method also includes the steps of re-enabling voice activation by the MCS, and establishing voice communication between the PSTN and the MCS.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.