Robust GPS-Based Synchronization of CDMA Mobile Networks

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 microsecs. 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.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2001
Accession Number
ADA485689

Entities

People

  • Dominik Schneuwly

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Cellular Networks
  • Clocks
  • Communication Equipment
  • Communication Networks
  • Computers
  • Computing Devices
  • Electronic Mail
  • Frequency
  • Global Positioning Systems
  • Mobile Communications
  • Mobile Phones
  • Networks
  • Phase Shift
  • Radio Interference
  • Telephone Equipment
  • Time Intervals

Fields of Study

  • Engineering

Readers

  • Computer Networking
  • Positioning, Navigation, and Timing (PNT) Technology.
  • Radio communications and signal processing.

Technology Areas

  • Space