Time Synchronization Technique for Mobile Base Stations over TDM-PON-Based Mobile Backhaul Using Precision Time Protocol

Kazuki TANAKA  Naoya NISHI  Ryo INOHARA  Kosuke NISHIMURA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E101-B   No.4   pp.979-986
Publication Date: 2018/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017OAP0004
Type of Manuscript: Special Section PAPER (Special Section on Optical Access System for Social Life)
Category: 
Keyword: 
mobile backhaul,  synchronization,  precision time protocol,  TDM-PON,  

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Summary: 
We propose a time synchronization technique for mobile base stations (BSs) by distributing the reference time information from one optical network unit (ONU) to the BSs under different ONUs over Time Division Multiplexing Passive Optical Network (TDM-PON) using common Precision Time Protocol (PTP). The time accuracy, long term time stability and time source switchover functionality for redundancy are confirmed by experimental verification. Furthermore, an interoperability test between a 10G-EPON prototype in which the proposed protocol is implemented and a commercial Time Division Long Term Evolution (TD-LTE) BS is successfully demonstrated obtaining time error within 119ns, which is much less than the criterion value of 1.5µs, for 60 hours.