Robust GPS-Based Synchronization of CDMA Mobile Networks

Dominik Schneuwly

Abstract:	Mobile communication networks based on the cdmaOne and cdma2000 standards require that the base-stations of their radio access networks be synchronized. All the base-stations of the network need a 1PPS phase reference with an accuracy of 3 us. The Global Positioning System (GPS) is currently the only practical way of implementing this type of synchronization. This paper proposes a two-fold protection concept for the base-station ’s phase clock. In case of a GPS-reception problem, the phase reference signal is maintained using the auxiliary frequency reference signal taken from the SONET (Synchronous Optical Network) transport network. When the latter fails (double failure), the clock eventually enters holdover mode. The paper analyzes the performance of the two protection modes, and compares it to the requirements of CDMA-based mobile networks.
Published in:	Proceedings of the 33th Annual Precise Time and Time Interval Systems and Applications Meeting November 27 - 27, 2001 Hyatt Regency Long Beach Long Beach, California
Pages:	191 - 198
Cite this article:	Schneuwly, Dominik, "Robust GPS-Based Synchronization of CDMA Mobile Networks," Proceedings of the 33th Annual Precise Time and Time Interval Systems and Applications Meeting, Long Beach, California, November 2001, pp. 191-198.
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