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Ranging method, ranging device and passive optical network

A technology of passive optical network and ranging method, applied in the field of communication, can solve the problems of low efficiency of ranging method, and achieve the effect of improving the efficiency of ranging

Inactive Publication Date: 2011-09-07
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a distance measuring method, device and passive optical network, to at least solve the problem of relatively low efficiency of the distance measuring method in the above-mentioned related art

Method used

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  • Ranging method, ranging device and passive optical network
  • Ranging method, ranging device and passive optical network
  • Ranging method, ranging device and passive optical network

Examples

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Embodiment 1

[0043] This embodiment provides a ranging method, which is applied in a passive optical network, and this embodiment combines the foregoing embodiments and preferred implementation manners therein. The method comprises the steps of:

[0044] Step 1: The ONU sends an SN message carrying a random delay to the OLT.

[0045] Step 2: On the OLT side, after obtaining the process that the ONU is the SN, the EQD value of the ONU can be calculated. The calculation method is as follows:

[0046] EqD(n)=Teqd-RTD(n)

[0047] Among them, Teqd is the 0-distance equalization delay, and RTD is the round-trip delay (Round trip delay).

[0048] RTD = including 2 times the transmission time + ONU response time + preassigned delay + random delay + start time.

[0049] In this embodiment, the SN message format is as shown in Table 1 below:

[0050] Table 1 Schematic representation of SN message format

[0051]

[0052] Through this preferred embodiment, the activation process of the ONU c...

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Abstract

The invention provides a ranging method, a ranging device and a passive optical network. The method comprises the following steps that: an optical line terminal (OLT) receives one or more serial number (SN) messages sent by one or more optical network units (ONUs); the OLT respectively determines round trip delays (RTDs) of the one or more ONUs by using random time delays carried in the one or more SN messages; and the OLT respectively determines equalized time delays (EqDs) of the one or more ONUs by using the one or more RTDs. By the invention, the ranging efficiency is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a ranging method, device and passive optical network. Background technique [0002] Passive Optical Network (PON, Passive Optical Network) features such as low cost, high capacity, and easy maintenance have made it an ideal broadband access method for FTTx. Since PON adopts the passive branch structure of time-division multiple access, multiple users share the same equipment, the same optical cable and the same optical splitter, and different optical network units (ONU, Optical Network Unit) are far away from the optical line terminal (OLT, Optical Line Termination) distances are different, and there will be conflicts in the uplink business at the OLT. Therefore, a mechanism is needed to make precise regulations on the time for each ONU to send data. This introduced mechanism is Ranging. [0003] In the current Passive Optical Network (PON for short) or Gigabit Passive Optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04J3/06H04B10/077
CPCH04Q11/0067H04Q2011/0079H04B10/0775H04Q2011/0088H04J3/0682
Inventor 王康黄健黄文杰
Owner ZTE CORP
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