Split-window time alignment

Details Split-window time alignment Split-window time alignment

1992-07-21

1993-07-20

Kuntz, Curtis

Multiplex communications

Wide area network

Packet switching

375107, 455 331, 370 953, H04J 306, H04L 700

Patent

active

052299961

ABSTRACT:
Synchronization is maintained between a regional radio transmitter/receiver and a remote transmitter/receiver communicating across a TDMA channel by detecting time misalignment of communications from the remote transmitter/receiver to the regional transmitter/receiver, commanding the remote transmitter/receiver to adjust its transmission timing, and, until the remote transmitter/receiver has adjusted its transmission timing, looking for a synchronization pattern accompanying transmissions by the remoter transmitter/receiver during two discontinuous time intervals, one centered about a time of occurrence of the synchronization pattern before the command and another centered about an expected time of occurrence of the synchronization pattern in response to the command. Effectively, what would otherwise be a disadvantageously wide time window is split into two advantageously narrow time windows to avoid detection of false syncs. Fewer false syncs are detected, and speech quality is increased.

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GSM Recommendation 05.10, Version 3.5.0, "Radio Sub-System Synchronization" (Jan. 1991).
"Cellular System, Dual-Mode Subscriber Equipment-Network Equipment Compatibility Specification", EIA Project No. 2215, (Dec. 1989), pp. 2-56-2-58.

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