Browse Prior Art Database

SYNCHRONIZATION BETWEEN DISCRETE SIMULCAST SYSTEMS

IP.com Disclosure Number: IPCOM000009487D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-28

Publishing Venue

Motorola

Related People

Authors:
Steven Goldberg Casey Hill

Abstract

Same frequency simulcast systems need to maintain relatively close launch times between their transmitter sites. Usually in the order of microsec- onds. There may be other paging systems in the sur- rounding area, but as long as they do not have a mutual interference area or utilize different RF channels, there usually isn't a need for them to maintain a synchronization alignment. It has been found however that at the fringe of coverage a pager can loose contact with its own system, time sync to another system, and then return to its own area out of sync. The time it takes to realize this situation and re-acquire the correct system synchronization can be significant, and cause the pager to miss mes- sages sent to it.