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1. (WO2013156904) RING BASED PRECISE TIME DATA NETWORK CLOCK PHASE ADJUSTMENTS

Pub. No.:    WO/2013/156904    International Application No.:    PCT/IB2013/052860
Publication Date: Fri Oct 25 01:59:59 CEST 2013 International Filing Date: Thu Apr 11 01:59:59 CEST 2013
IPC: H04J 3/06
Applicants: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
Inventors: ZHENG, Qun
GEYER, Thomas
ZHANG, Tonghua
Title: RING BASED PRECISE TIME DATA NETWORK CLOCK PHASE ADJUSTMENTS
Abstract:
Clock phase errors are detected and adjusted in a network with loop back connections for clock signals. In one embodiment, a method is performed in a ring network with slave clock nodes. A timing packet is sent from the master clock node to a first slave clock node of the ring. A timing packet is received from a last slave clock node of the ring. A phase alignment offset is determined by comparing a recovered time from the received timing packet with the time of the master clock node local clock and a phase correction value is determined for the slave clock nodes based on the determined phase alignment offset. A phase correction packet including the phase correction value is then sent from the master clock node to at least one of the slave clock nodes.