Browse Prior Art Database

ALGORITHM TO SMOOTH TIME ADVANCE CORRECTIONS

IP.com Disclosure Number: IPCOM000008805D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-15

Publishing Venue

Motorola

Related People

Authors:
Tim Dickinson Peter Hamot Scott Zielke

Abstract

During co-channel interference conditions where the desired and interfering BR signals are subject to log-normal fading such that the subscriber is periodically locking into the interfering BR, the iDEN subscriber is not discarding sync timing infor- mation from the BR with the incorrect color code. Instead, the subscriber changes its timing reference to the interfering BR. When this occurs the desired BR attempts to correct any timing errors. The cor- rections, however, are not received by the subscriber since it is locked onto the interfering signal. This can lead to rapid increases in the time correction value. Consequently, when the log-normal fade sub- sides, the subscriber's time correction is erroneous. The result is an audio artifact or a dropped call.