Using multiple synchronization sources to synchronize small cells

A small cell synchronization system using multiple synchronization sources of a multiple small cell system in which two or more different mobile communication small cells using two or more multiple synchronization sources form one system, comprising:

• an oscillator providing a system clock signal of a predetermined frequency;
• and
• a synchronization management module that collectively manages multiple synchronization sources, and determines a new synchronized Pulse Per Second (PPS) according to a result of comparing a previous synchronized PPS with a PPS for each synchronization source using the system clock and provides it to each small cell along with the system clock, the synchronization management module including:
• a synchronization error calculation part comparing each synchronization source with the previous synchronized PPS through a system clock to calculate a synchronization error;
• a synchronization reliability calculation part for calculating synchronization reliability based on the synchronization error for each synchronization source calculated by the synchronization error calculation part and the quality status information provided from each synchronization source;
• a weight setting part that sets weights for each synchronization source;
• a synchronization determination part that determines the new synchronized PPS according to a result of multiplying the synchronization reliability of each synchronization source calculated by the synchronization reliability calculation part by the weight of each synchronization source set by the weight setting part;
• and
• a synchronization providing part that provides the new synchronized PPS determined by the synchronization determining part and the system clock to each small cell.