Method and apparatus for re-establishment of a communication
US5488640A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1994 |
| Grant date | Jan 30, 1996 |
| Priority date | — |
| Expiry date | Aug 31, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/18558
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Ongoing communications over radio links between communication stations and subscriber units may be unexpectedly broken. Where the communication stations include low-Earth orbit satellites, communication links are difficult to re-establish because of the timing differential and Doppler-frequency shift associated with the satellite's movement. The communication link is re-established by initially changing the modulation technique in an attempt to re-synchronize the communication station and the subscriber unit. If this fails, the subscriber unit performs an acquisition attempt on another antenna beam of the communication station. If this is not successful, the subscriber may perform an acquisition attempt on antenna beams of another communication station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.