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Method and system for time synchronization on passive optical network

A passive optical network and time synchronization technology, applied in time division multiplexing systems, transmission systems, synchronization devices, etc., can solve problems such as occupancy, complex processing procedures, and large protocol workloads

Active Publication Date: 2015-07-22
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a method and system for time synchronization on a passive optical network, which is used to solve the problems of complex processing flow, large protocol workload, and large network bandwidth occupation when using the standard PTP protocol for time synchronization on EPON. technical problem

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  • Method and system for time synchronization on passive optical network
  • Method and system for time synchronization on passive optical network

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Embodiment Construction

[0036] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0037] figure 1 It is a system structure diagram of the PON network. The PON network generally consists of three parts: OLT (Optical Line Terminal, Optical Line Terminal), ODN (Optical Distribution Network, Optical Distribution Network) and ONU (Optical Network Unit, Optical Network Unit). Among them, the distance between the OLT and the ONU is generally far. The time provider is generally a time server (such as IEEE1588 time) or GPS. The dotted frame in the figure is the part involved in the technical solution of the present invention. The local time of the OLT is synchronized with the external time provider and a certain accuracy is guaranteed, while the time syn...

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Abstract

Disclosed are a method and a system for time synchronization in a passive optical network. The method includes: an OLT transmitting a first time t n and an OLT MPCP counter value s n corresponding to the first time t n to an ONU; after receiving the t n and s n , in conjunction with ranging information, the ONU calculating a corresponding second time t' n through a determined ONU MPCP counter value, or calculating a corresponding ONU MPCP counter value s' n through a determined second time t' n , and updating a local time. According to the solution provided in the present invention, the time of the synchronization setting can be flexibly selected without real time requirements, the processing flow is simple, and the occupation of the bandwidth is reduced.

Description

technical field [0001] The present invention relates to the field of passive optical network (Passive Optical Network, PON) communication, in particular to a method and system for time synchronization on a passive optical network. Background technique [0002] Optical access technology provides large bandwidth and high reliability, and is the development direction of access technology. PON is one of the main technologies for optical access, especially EPON (Ethernet Passive Optical Network, EPON) technology, which has been widely used in many regions around the world. [0003] With the rapid development of data services, the mobility requirements of data access are constantly emerging, and the convergence of wired and wireless networks will better meet user experience. EPON technology has data, voice and TDM (TimeDivision Multiplex) full-service access capabilities, which can meet the evolving wireless access requirements. Especially in the access applications of micro cel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00H04L29/06
CPCH04Q11/0067H04J3/0682H04Q2011/0079H04J3/065H04L7/00
Inventor 陆建鑫何苑凌
Owner ZTE CORP
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