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Method and system for synchronizing uplink transmission in passive optical network

A technology of passive optical network and optical network unit, which is applied in the field of synchronous uplink transmission and can solve problems such as low efficiency

Active Publication Date: 2011-05-25
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
[0006] 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

[0064] The method for synchronous uplink transmission in a passive optical network provided in this embodiment mainly includes the following steps:

[0065] 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 ;

[0066] 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;

[0067] 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 ;

...

Embodiment 2

[0071] 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.

[0072] 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:

[0073]Step 1, the OLT performs ranging to the ONU newly connected to the PON system, and obtains the RTD of the ONU;

[0074] 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 v...

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Abstract

The invention discloses a method and a system for synchronizing uplink transmission in a passive optical network (PON). The method comprises the following steps that: an optical line terminal (OLT) determines the maximum equalization delay (EqDmax) according to the maximum round trip delay (RTDmax) of all on-line optical network units (ONU) in a PON system, and calculates the values of the EqD of all the ONUs according to the EqDmax; when the RTDmax is updated, the OLT calculates EqD updating information according to the updated RTDmax; and the OLT sends EqD updating information to all on-line ONUs, and after updating the EqD according to the received EqD updating information, the ONUs synchronize uplink transmission according to the updated EqD. The OLT can update the RTDmax of all on-line ONUs timely and updates the EqD of each ONU according to the RTDmax dynamically, so that uplink transmission efficiency can be improved.

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 is composed of an optical line terminal (Optical Line Terminal, OLT for short), an Optical Network Unit (ONU for short) at 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 connect...

Claims

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Application Information

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Patent Type & Authority Applications(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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