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Time synchronization processing method and system used in passive optical network and OLT (Optical Line Terminal)

A passive optical network, time synchronization technology, applied in the field of communications, can solve problems such as affecting TDM, failure, and time asynchrony

Inactive Publication Date: 2011-09-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after the OLT sends the time synchronization message to the ONU, due to network congestion or other reasons, the time synchronization message may not reach the ONU or the message may fail due to too long a delay. In this way, the time on the OLT and the ONU may not be synchronized. Therefore, it seriously affects the services such as TDM on the PON that rely on the time synchronization mechanism

Method used

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  • Time synchronization processing method and system used in passive optical network and OLT (Optical Line Terminal)
  • Time synchronization processing method and system used in passive optical network and OLT (Optical Line Terminal)
  • Time synchronization processing method and system used in passive optical network and OLT (Optical Line Terminal)

Examples

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example 1

[0088] This example uses an Ethernet passive optical network (Ethernet PON, referred to as EPON for short) as an example to illustrate the implementation process of the present invention, wherein the OLT utilizes the MPCP synchronization mechanism and ranging characteristics of EPON conforming to the IEEE802.3 specification to realize the OLT and ONU time synchronization between the OLT and ONU, and use MPCP or OSSPDU message to transfer time information between OLT and ONU, that is, use MPCP or OSSPDU message as time synchronization message. Figure 5 is an EPON network networking diagram according to an embodiment of the present invention, such as Figure 5 As shown, the OLT is connected to five ONUs (ONU_1 to ONU_5) through an Optical Distribution Network (ODN for short).

[0089] Image 6 is a schematic diagram of the process corresponding to the OLT in the time synchronization method according to the preferred example 1 of the embodiments of the present invention, as sho...

example 2

[0110] This example uses EPON as an example to illustrate the implementation process of the present invention. The MPCP synchronization mechanism and ranging feature of EPON are used to realize the time synchronization between the OLT and the ONU, and the extended OAM message is used as the time synchronization message between the OLT and the ONU. transfer time information. This example uses Figure 5 The shown EPON network networking.

[0111] Figure 8 It is a schematic diagram of the process corresponding to the OLT in the time synchronization method of the preferred embodiment 2 according to the embodiment of the present invention, such as Figure 8 shown, the process includes the following steps:

[0112] Step 801: After measuring the ranging of each ONU, the OLT obtains the round-trip delay RTT of each ONU, that is, ranging information, and sends the ranging information to each ONU through a unicast message.

[0113] Step 802, when the ToD needs to be synchronized, t...

example 3

[0133] This preferred example improves the prior art and adds a confirmation mechanism. For the time synchronization message sent by the OLT, the ONU will send an acknowledgement message corresponding to the time synchronization message. Figure 10 is a flow chart of the processing method for time synchronization in the PON according to the preferred embodiment 3 of the embodiment of the present invention, such as Figure 10 As shown, the method includes the following steps:

[0134] Step 1001, the OLT sends a time synchronization message to the ONU, and waits for the ONU to return a valid confirmation message.

[0135] Step 1002, if the OLT receives the confirmation message returned by the ONU within the predetermined time T, then compare the parameters carried in the message with the parameters in the time synchronization message sent last time, and determine the returned confirmation message and the sent time synchronization message. match. If it can match, it is conside...

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Abstract

The invention discloses a time synchronization processing method and system used in a passive optical network (PON) and an OLT (Optical Line Terminal). The method comprises the following steps: the OLT sends a time synchronization message to an optical network unit (ONU); the OLT waits for receiving a confirmation message from the ONU; and the OLT judges whether the time synchronization message is sent successfully according to the receiving of the confirmation message. Due to the adoption of the method and the system, the OLT can judge whether the ONU receives the time synchronization message in the time synchronization process of the PON to perform corresponding operation.

Description

technical field [0001] The present invention relates to the field of communications, and in particular, to a method, a system and an OLT for processing time synchronization in a passive optical network. Background technique [0002] Optical access technology can provide large bandwidth and high reliability, and passive optical network (Passive Optical Network, PON) is a major optical access technology, which has been widely used in many regions around the world. [0003] The rapid development of data services highlights the requirement for mobility of data access. The convergence of wired and wireless will be able to better meet user requirements and improve user experience. The PON technology has full-service access capabilities for data, voice, and Time Division Multiplex (TDM for short), and can meet evolving wireless access requirements. Especially in the application of microcell and home base station access, the convergence characteristics of PON can make the whole net...

Claims

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Application Information

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IPC IPC(8): H04J3/06
CPCH04J3/0664
Inventor 何苑凌陆建鑫
Owner ZTE CORP
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