SYNCHRONIZATION SYSTEM FOR MOBILE OBJECT COMMUNICATION NETWORK

Japanese Patent JP2989378

B2

PURPOSE: To prevent hindrance in the synchronization adjustment of a subordinate radio base station even when a fault takes place in the clock signal of the radio base station on the half-way of a synchronous signal distribution system.
CONSTITUTION: The 1st phase difference detecting means 4b of a subordinate radio base station 4 always detects a phase difference between a synchronous signal from a host radio base station 3 and a clock signal generated from a clock signal generating means 4a. When the detected phase difference is larger than a prescribed phase difference, a 2nd phase difference detecting means 4c detects a phase difference between the synchronous signal from an adjacent radio base station 7 and a clock signal from the clock signal generating means 4a. A synchronization control means 4d detects the abnormality of the host radio base station 3 based on the phase difference detected by the 1st phase difference detection means 4b and the 2nd phase difference detection means 4c, and when it is detected, the clock signal generating means 4a generates a clock signal in phase synchronously with the synchronous signal of the adjacent radio base station 7.

SHIMIZU TAKAFUMI

JP17843892A

December 13, 1999

July 06, 1992

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FUJITSU KK

H04B7/26; (IPC1-7): H04Q7/36; H04B7/26

Hattori Takeshi

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