CN102176682B - Ranging method, ranging device and passive optical network - Google Patents
Ranging method, ranging device and passive optical network Download PDFInfo
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- CN102176682B CN102176682B CN201110034198.1A CN201110034198A CN102176682B CN 102176682 B CN102176682 B CN 102176682B CN 201110034198 A CN201110034198 A CN 201110034198A CN 102176682 B CN102176682 B CN 102176682B
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- onu
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0088—Signalling aspects
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Small-Scale Networks (AREA)
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
The present invention relates to the communications field, in particular to a kind of distance-finding method, device and EPON.
Background technology
The feature such as low cost, high power capacity, easy care of EPON (PON, Passive Optical Network) has become the desirable broadband access method of FTTx.Because PON adopts the passive tapping structure of time division multiple access access, multiple user shares same equipment, same optical cable and same optical branching device, different optical network unit (ONU, Optical Network Unit) distance light road terminal (OLT, Optical Line Termination) distance different, will the conflict of uplink service be there will be at OLT.Therefore the time of a mechanism to the transmission data of each ONU is needed to make accurate regulation.This mechanism introduced finds range (Ranging) exactly.
Current EPON (Passive Optical Network, referred to as PON) or gigabit passive optical network (GigabitPassive Optical Network, referred to as GPON) in, optical line terminal (Optical Line Terminal, referred to as OLT) to optical network unit (Optical Network Unit, referred to as ONU) when finding range, once find range for an ONU at every turn, need the SN (SERIAL NUMBER) first obtaining ONU, then ONU is found range, when range finding, once can only survey an ONU, when ONU is a lot, ranging efficiency is lower.
For the problem that the efficiency comparison of distance-finding method in correlation technique is low, at present effective solution is not yet proposed.
Summary of the invention
Main purpose of the present invention is to provide a kind of distance-finding method, device and EPON, with the low problem of the efficiency comparison at least solving distance-finding method in above-mentioned correlation technique.
According to an aspect of the present invention, provide a kind of distance-finding method, be applied to EPON.
Distance-finding method according to the present invention comprises: OLT receives the one or more string SN message sent from one or more ONU; OLT uses the random delay carried in one or more SN message respectively, determines the round-trip delay (RTD) of one or more ONU; OLT uses one or more RTD respectively, determines the balanced time delay (EqD) of one or more ONU.
Further, OLT uses the random delay carried in one or more SN message respectively, determines that the round-trip delay RTD of one or more ONU comprises: OLT uses following formula to determine RTD:RTD=2
*+ ONU transmission time ,+preassigned response time delay+ random delay+start time, wherein, transmission time is determined according to the fiber optic network at OLT place, preassigned delay is the specifically common value of the ONU delay that system is determined, the ONU response time is the time that the ONU of default carries out operation response, start time is the time of the ONU transmission uplink frame of OLT setting, and random delay is the random delay of ONU transmission frame.
Further, OLT uses one or more RTD respectively, determine that the balanced time delay EqD of one or more ONU comprises: OLT uses following formula to determine the EqD:EqD=Teqd-RTD of one or more OLT respectively, wherein, Teqd is the balanced time delay of zero distance of Operation system setting.
Further, SN message its 11st and 12 bytes on carry random delay.
According to a further aspect in the invention, additionally provide a kind of distance-finding method, be applied to EPON.
Distance-finding method according to the present invention comprises: one or more ONU carries random delay in SN message; One or more ONU sends SN message to optical line terminal OLT, and wherein, SN message is used for OLT and determines balanced time delay EqD.
In accordance with a further aspect of the present invention, provide a kind of range unit, be applied to OLT.
Range unit according to the present invention comprises: receiver module, for receiving the one or more string SN message sent from one or more optical network unit ONU; First determination module, for using the random delay carried in one or more SN message respectively, determines the round-trip delay (RTD) of one or more ONU; Second determination module, for using one or more RTD respectively, determines the balanced time delay (EqD) of one or more ONU.
Further, the first determination module, determines RTD:RTD=2 for using following formula
*+ ONU transmission time ,+preassigned response time delay+ random delay+start time, wherein, transmission time is determined according to the fiber optic network at OLT place, preassigned delay is the specifically common value of the ONU delay that system is determined, the ONU response time is the time that the ONU of default carries out operation response, start time is the time of the ONU transmission uplink frame of OLT setting, and random delay is the random delay of ONU transmission frame.
Further, the second determination module, for the EqD:EqD=Teqd-RTD using following formula to determine one or more OLT respectively, wherein, Teqd is the balanced time delay of zero distance of Operation system setting.
According to another aspect of the invention, provide a kind of range unit, be applied to ONU.
Range unit according to the present invention comprises: processing module, for carrying random delay in SN message; Sending module, for sending SN message to optical line terminal OLT, wherein, SN message is used for OLT and determines balanced time delay (EqD).
Another aspect of the invention, additionally provides a kind of EPON.
EPON according to the present invention comprises: above-mentioned range unit (being applied to OLT) and above-mentioned range unit (being applied to ONU).
Pass through the present invention, the random delay carried in the SN message that the one or more ONU adopting OLT use to receive send, determine RTD and EqD, to solve in correlation technique and once can only to find range the problem causing efficiency comparison low to an ONU, and then reach the effect that improve ranging efficiency.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the first pass figure of the distance-finding method according to the embodiment of the present invention;
Fig. 2 is the second flow chart of the distance-finding method according to the embodiment of the present invention;
Fig. 3 is the first structured flowchart of the range unit according to the embodiment of the present invention;
Fig. 4 is the second structured flowchart of the distance-finding method according to the embodiment of the present invention; And
Fig. 5 is the structured flowchart of the EPON according to the embodiment of the present invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Present embodiments provide a kind of distance-finding method, be applied to EPON, Fig. 1 is the flow chart of the distance-finding method according to the embodiment of the present invention, and as shown in Figure 1, the method comprises:
Step S102:OLT receives the one or more string SN message sent from one or more optical network unit ONU.
Step S104:OLT uses the random delay carried in one or more SN message respectively, determines the RTD of one or more ONU.
Step S106:OLT uses one or more RTD respectively, determines the EqD of one or more ONU.
Pass through above-mentioned steps, the random delay carried in the SN message that OLT uses the one or more ONU received to send, determine RTD and EqD, solving in correlation technique once can only find range to an ONU causes the problem of efficiency comparison, thus improves the effect of range finding.
Preferably, below one of step S104 is preferred embodiment described.OLT uses following formula to determine RTD:RTD=2
*+ ONU transmission time ,+preassigned response time delay+ random delay+start time, wherein, transmission time is determined according to the fiber optic network at OLT place, preassigned delay is the specifically common value of the ONU delay that system is determined, the ONU response time is the time that the ONU of default carries out operation response, start time is the time of the ONU transmission uplink frame of OLT setting, and random delay is the random delay of ONU transmission frame.By the preferred embodiment, improve the accuracy rate determining RTD.
Preferably, below one of step S106 is preferred embodiment described.OLT uses following formula to determine the EqD:EqD=Teqd-RTD of one or more OLT respectively, and wherein, Teqd is the balanced time delay of zero distance of Operation system setting.By the preferred embodiment, improve the accuracy rate determining EqD.
Preferably, SN message its 11st and 12 bytes on carry random delay.By the preferred embodiment, use existing signaling to carry random delay, reduce signaling traffic load.
Present embodiments provide a kind of distance-finding method, be applied to EPON, Fig. 2 is the second flow chart of the distance-finding method according to the embodiment of the present invention, and as shown in Figure 2, the method comprises:
Step S202: one or more ONU carries random delay in SN message;
Step S204: one or more ONU to OLT sends SN message, and wherein, SN message is used for OLT and determines balanced time delay EqD.
Pass through the preferred embodiment, one or more ONU sends the SN message carrying random delay to OLT, this SN message is used for OLT and determines EqD, to solve in correlation technique and once can only to find range the problem causing efficiency comparison low to an ONU, thus improve the efficiency of range finding.
Embodiment one
Present embodiments provide a kind of distance-finding method, be applied in EPON, the present embodiment combines above-described embodiment and preferred implementation wherein.The method comprises the steps:
Step 1:ONU sends the SN message carrying random delay to OLT.
Step 2: in OLT side, after acquisition ONU is the process of SN, just can calculate the EQD value of ONU.Computational methods are as follows:
EqD(n)＝Teqd-RTD(n)
Wherein Teqd is 0 apart from balanced time delay, and RTD is round-trip delay (Round trip delay).
RTD=comprises the+ONU transmission time ,+preassigned response time delay+random delay+start time. of 2 times
In the present embodiment, SN message format is as shown in table 1 below:
Table 1SN message format signal table
By this preferred embodiment, the activation process of ONU can be simplified, improve the efficiency of range finding.
Present embodiments provide a kind of range unit, be applied to OLT, Fig. 3 is the first structured flowchart of the range unit according to the embodiment of the present invention, as shown in Figure 3, this device comprises: receiver module 42, the first determination module 44, second determination module 46, is described in detail to said structure below.
Receiver module 42, for receiving the one or more string SN message sent from one or more optical network unit ONU; First determination module 44, is connected to receiver module 42, and the random delay carried in the one or more SN message received for using receiver module 42 respectively, determines the round-trip delay RTD of one or more ONU; Second determination module 46, is connected to the first determination module 44, for the one or more RTD using the first determination module 44 to determine respectively, determines the balanced time delay EqD of one or more ONU.
Preferably, the first determination module, determines RTD:RTD=2 for using following formula
*+ ONU transmission time ,+preassigned response time delay+ random delay+start time, wherein, transmission time is determined according to the fiber optic network at OLT place, preassigned delay is the specifically common value of the ONU delay that system is determined, the ONU response time is the time that the ONU of default carries out operation response, start time is the time of the ONU transmission uplink frame of OLT setting, and random delay is the random delay of ONU transmission frame.
Preferably, the second determination module, for the EqD:EqD=Teqd-RTD using following formula to determine one or more OLT respectively, wherein, Teqd is the balanced time delay of zero distance of Operation system setting.
Present embodiments provide a kind of range unit, be applied to ONU, Fig. 4 is the second structured flowchart of the distance-finding method according to the embodiment of the present invention, and as shown in Figure 4, this device comprises: processing module 52, and sending module 54, is described in detail to said structure below.
Processing module 52, for carrying random delay in string SN message; Sending module 54, is connected to processing module 52, and for the SN message processed to optical line terminal OLT transmission processing module 52, wherein, SN message is used for OLT and determines balanced time delay EqD.
Present embodiments provide a kind of EPON, Fig. 5 is the structured flowchart of the EPON according to the embodiment of the present invention, as shown in Figure 5, this EPON comprises: range unit (being applied to OLT) 2 and range unit (being applied to ONU) 4, the concrete structure of range unit (being applied to OLT) 2 as shown in Figure 3, the concrete structure of range unit (being applied to ONU) 4 as shown in Figure 4, does not repeat them here.
Pass through above-described embodiment, provide a kind of distance-finding method, device and EPON, the random delay carried in the SN message using the one or more ONU received to send by OLT, determine RTD and EqD, solving in correlation technique once can only find range to an ONU causes the problem of efficiency comparison, thus improves the effect of range finding.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus they storages can be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a distance-finding method, is applied to EPON, it is characterized in that, comprising:
Optical line terminal OLT receives the one or more string SN message sent from one or more optical network unit ONU;
Described OLT uses the random delay carried in described one or more SN message respectively, determines the round-trip delay RTD of described one or more ONU;
Described OLT uses described one or more RTD respectively, determines the balanced time delay EqD of described one or more ONU;
Wherein, described OLT uses described one or more RTD respectively, determine that the balanced time delay EqD of described one or more ONU comprises: described OLT uses following formula to determine the described EqD:EqD=Teqd-RTD of described one or more OLT respectively, wherein, Teqd is the balanced time delay of zero distance of Operation system setting.
2. method according to claim 1, is characterized in that, described OLT uses the random delay carried in described one or more SN message respectively, determines that the round-trip delay RTD of described one or more ONU comprises:
Described OLT uses following formula to determine described RTD:
RTD=2* transmission time+ONU response time+preassigned delay+ random delay+start time, wherein, the described transmission time is determined according to the fiber optic network at described OLT place, preassigned delay is the specifically common value of the ONU delay that system is determined, the ONU response time is the time that the ONU of default carries out operation response, start time is the time of the ONU transmission uplink frame of OLT setting, and random delay is the random delay of ONU transmission frame.
3. method according to any one of claim 1 to 2, is characterized in that, described SN message its 11st and 12 bytes on carry described random delay.
4. a distance-finding method, is applied to EPON, it is characterized in that, comprising:
One or more ONU carries random delay in string SN message;
Described one or more ONU sends described SN message to optical line terminal OLT, and wherein, described SN message is used for described OLT and determines balanced time delay EqD;
Wherein, described OLT determines that balanced time delay EqD comprises: described OLT uses following formula to determine the described EqD:EqD=Teqd-RTD of described one or more OLT respectively, and wherein, Teqd is the balanced time delay of zero distance of Operation system setting.
5. a range unit, is applied to optical line terminal OLT, it is characterized in that, comprising:
Receiver module, for receiving the one or more string SN message sent from one or more optical network unit ONU;
First determination module, for using the random delay carried in described one or more SN message respectively, determines the round-trip delay RTD of described one or more ONU;
Second determination module, for using described one or more RTD respectively, determines the balanced time delay EqD of described one or more ONU;
Described second determination module, the described EqD for using following formula to determine described one or more OLT respectively:
EqD=Teqd-RTD, wherein, Teqd is the balanced time delay of zero distance of Operation system setting.
6. device according to claim 5, is characterized in that,
Described first determination module, determine described RTD for using following formula:
RTD=2* transmission time+ONU response time+preassigned delay+ random delay+start time, wherein, the described transmission time is determined according to the fiber optic network at described OLT place, preassigned delay is the specifically common value of the ONU delay that system is determined, the ONU response time is the time that the ONU of default carries out operation response, start time is the time of the ONU transmission uplink frame of OLT setting, and random delay is the random delay of ONU transmission frame.
7. a range unit, is applied to optical network unit ONU, it is characterized in that, comprising:
Processing module, for carrying random delay in string SN message;
Sending module, for sending described SN message to optical line terminal OLT, wherein, described SN message is used for described OLT and determines balanced time delay EqD;
Wherein, described OLT determines that balanced time delay EqD comprises: described OLT uses following formula to determine the described EqD:EqD=Teqd-RTD of described one or more OLT respectively, and wherein, Teqd is the balanced time delay of zero distance of Operation system setting.
8. an EPON, is characterized in that, comprising:
Range unit according to any one of claim 5-6 and range unit according to claim 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110034198.1A CN102176682B (en) | 2011-01-31 | 2011-01-31 | Ranging method, ranging device and passive optical network |
| PCT/CN2011/075973 WO2012103695A1 (en) | 2011-01-31 | 2011-06-20 | Method and device for ranging and passive optical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110034198.1A CN102176682B (en) | 2011-01-31 | 2011-01-31 | Ranging method, ranging device and passive optical network |
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| CN102176682A CN102176682A (en) | 2011-09-07 |
| CN102176682B true CN102176682B (en) | 2015-05-06 |
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| WO (1) | WO2012103695A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI487304B (en) * | 2012-12-07 | 2015-06-01 | Ind Tech Res Inst | Optical network failure recovery method |
| CN105338431A (en) * | 2014-08-08 | 2016-02-17 | 中兴通讯股份有限公司 | Hardware random delay compensation implementing method and hardware random delay compensation implementing device |
| CN104702350B (en) * | 2015-03-31 | 2017-03-08 | 中国航空无线电电子研究所 | A kind of radio ranging system in aviation wireless communication system |
| CN104734772B (en) * | 2015-04-03 | 2017-08-01 | 烽火通信科技股份有限公司 | EPON backbone's optical link protection system and its method for obtaining balanced time delay |
| CN111866627A (en) * | 2020-07-20 | 2020-10-30 | 芯河半导体科技(无锡)有限公司 | Method and system for GPON accurate ranging |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050003642A (en) * | 2003-07-03 | 2005-01-12 | 삼성전자주식회사 | Method for ONU Activation in Gigabit-capable PON |
| CN101192885A (en) * | 2006-11-27 | 2008-06-04 | 华为技术有限公司 | A distance measuring method and system for passive optical network |
| KR20090083634A (en) * | 2008-01-30 | 2009-08-04 | 금오공과대학교 산학협력단 | Enhanced onu activation methods for the g-pon based on g.984.3 |
| CN102075820A (en) * | 2009-11-23 | 2011-05-25 | 中兴通讯股份有限公司 | Method and device for measuring distance in passive optical network |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232693A (en) * | 2007-01-22 | 2008-07-30 | 华为技术有限公司 | System, equipment and method for measuring reciprocation time delay |
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2011
- 2011-01-31 CN CN201110034198.1A patent/CN102176682B/en not_active Expired - Fee Related
- 2011-06-20 WO PCT/CN2011/075973 patent/WO2012103695A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050003642A (en) * | 2003-07-03 | 2005-01-12 | 삼성전자주식회사 | Method for ONU Activation in Gigabit-capable PON |
| CN101192885A (en) * | 2006-11-27 | 2008-06-04 | 华为技术有限公司 | A distance measuring method and system for passive optical network |
| KR20090083634A (en) * | 2008-01-30 | 2009-08-04 | 금오공과대학교 산학협력단 | Enhanced onu activation methods for the g-pon based on g.984.3 |
| CN102075820A (en) * | 2009-11-23 | 2011-05-25 | 中兴通讯股份有限公司 | Method and device for measuring distance in passive optical network |
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| WO2012103695A1 (en) | 2012-08-09 |
| CN102176682A (en) | 2011-09-07 |
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