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Method and system for synchronizing uplink transmission in passive optical network

A passive optical network and optical network unit technology, applied in the field of synchronous uplink transmission, can solve the problems of low efficiency, achieve the effect of reducing EqD and improving uplink transmission efficiency

Active Publication Date: 2014-12-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technique, the RTD max The value of is constant, so EqD max The value of is constant, each ONU according to EqD max When the value of L in the PON system is large, the value of EqD of each ONU is also large, resulting in low efficiency of upstream transmission
[0010] Therefore, it is necessary to provide a solution to solve the problem of low efficiency of uplink transmission when the L value in the PON system is large

Method used

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  • Method and system for synchronizing uplink transmission in passive optical network
  • Method and system for synchronizing uplink transmission in passive optical network
  • Method and system for synchronizing uplink transmission in passive optical network

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Embodiment 1

[0068] The method for synchronous uplink transmission in a passive optical network provided in this embodiment mainly includes the following steps:

[0069] Step 101, when the OLT completes ranging for each ONU, the OLT stores the RTD value of the ONU, and the OLT stores the value RTD of the maximum RTD of all ONUs currently online in the PON system max ;

[0070] Step 102, the OLT regularly and / or irregularly measures the RTD of all online ONUs in the PON system, and compares the RTD values ​​of all ONUs measured with the stored RTD max For comparison, if the measured RTD value of the ONU is greater than the RTD stored locally in the OLT max value, then the OLT updates the maximum RTD value of the local storage to the value of the RTD of the ONU;

[0071] Step 103, OLT according to the updated RTD max Update EqD max , and according to the updated EqD max and remeasured RTD i Use the following formula to update the value of EqD of each ONU: EqD i =EqD max -RTD i ;

[0...

Embodiment 2

[0075] When the OLT completes the ranging of an ONU, the OLT stores the RTD value of the ONU, and the OLT stores the maximum RTD value of the online ONU in all current PON systems RTD max and according to the RTD max Determined EqD max value.

[0076] When a new ONU or an ONU that needs to restore the PON service is connected to the PON system, the OLT and the ONU use the following main steps to complete the transmission synchronization of all upstream ONUs:

[0077] Step 1, the OLT performs ranging to the ONU newly connected to the PON system, and obtains the RTD of the ONU;

[0078] Step 2, the OLT stores the value of the RTD of the ONU, and compares the value of the RTD of the ONU with the RTD stored locally in the OLT max value, if the value of the RTD of the ONU is greater than the RTD stored locally in the OLT max value, then the OLT updates the maximum RTD value stored locally to the value of the RTD of the ONU, and according to the updated RTD max Update EqD max ...

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Abstract

Disclosed is a method for synchronizing upward transmission in passive optical network. The method includes the following steps: An Optical Line Terminal (OLT) determines a maximum Equalization Delay EqDmax according to the maximum RTDmax among Round trip delay (RTD) of all online Optical Network Units (ONU) in Passive Optical Network (PON) system and calculates values of Equalization delay (EqD) of all ONU according to the maximum Equalization Delay EqDmax; when the RTDmax is updated, the OLT calculates EqD update information according to the updated RTDmax; the OLT sends the EqD update information to all online ONU, and the ONU updates the value of EqD according to the received EqD update information and then synchronizes upward transmission according to the updated value of EqD. The present invention also provides a system for synchronizing upward transmission in passive optical network and an OLT. The present invention improves efficiency of upward transmission.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for synchronous uplink transmission in a passive optical network. Background technique [0002] Gigabit-Capable Passive Optical Network (GPON) technology is an important technical branch of the passive optical network (PON) family. Similar to other PON technologies, GPON is also a point-to-multipoint Topological passive optical access technology. [0003] The topology of GPON system is as follows: figure 1 As shown, GPON consists of an optical line terminal (Optical Line Terminal, OLT for short), an Optical Network Unit (ONU for short) on the user side, and an Optical Distribution Network (ODN for short). , usually using a point-to-multipoint network structure. ODN is composed of passive optical components such as single-mode optical fibers, optical splitters, and optical connectors, and provides optical transmission media for the physical connection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04J3/16H04Q11/00
CPCH04J3/0682
Inventor 张伟良耿丹张德智
Owner ZTE CORP
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