WO2012019458A1 - Procédé et système de mesure de distance dans un réseau optique passif - Google Patents

Procédé et système de mesure de distance dans un réseau optique passif Download PDF

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Publication number
WO2012019458A1
WO2012019458A1 PCT/CN2011/071838 CN2011071838W WO2012019458A1 WO 2012019458 A1 WO2012019458 A1 WO 2012019458A1 CN 2011071838 W CN2011071838 W CN 2011071838W WO 2012019458 A1 WO2012019458 A1 WO 2012019458A1
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Prior art keywords
onu
olt
tested
time
standby
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PCT/CN2011/071838
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English (en)
Chinese (zh)
Inventor
张伟良
耿丹
何苑凌
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中兴通讯股份有限公司
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Publication of WO2012019458A1 publication Critical patent/WO2012019458A1/fr

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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

Definitions

  • the present invention relates to the field of communications, and in particular, to a ranging method and system in a Passive Optical Network (PON). Background technique
  • GPON Gigabit-Capable Passive Optical Network
  • EPON Ethernet Passive Optical Network
  • the topology of the PON system is shown in Figure 1.
  • the PON consists of the Optical Line Terminal (OLT) on the central office, the Optical Network Unit (ONU) on the user side, and the Optical Distribution Network (ODN, Optical Distributio).
  • Network is composed of a point-to-multipoint network structure.
  • the ODN consists of passive optical components such as single-mode fibers, optical splitters, and optical connectors.
  • the ODN provides an optical transmission medium for the physical connection between the OLT and the ONU.
  • the downlink direction that is, the data transmission from the OLT to the ONU direction is broadcast, each ONU receives all the frames, and the ONU of the GPON system is based on the ONU identifier (ONU-ID, ONU Identifier), Gigabit.
  • the passive optical network encapsulation method, the port identifier (GEM-Port ID) and the allocation identifier (Allocation-ID) are used to obtain the frame of the own.
  • the ONU of the EPON system is based on the logical link identifier (LLID) of the ONU. To get your own frame.
  • each ONU For the uplink direction, that is, data transmission from the ONU to the OLT direction, since each ONU needs to share the transmission medium, each ONU should transmit uplink data to the OLT to arrange its own time slot. The distance between each ONU and the OLT is different. To prevent the uplink data sent by each ONU from reaching the OLT at the same time, the OLT needs to be in the registration activation phase. The ONU performs ranging.
  • the GPON system uses the following method to measure the ONU: The OLT first determines the maximum distance L that the ONU supports itself, and the OLT measures the loop delay of the ONU at the L ( RTD, Round trip delay) RTD max value, and determines all ONU RTD max maximum-equalization delay (EqD, equalization delay) according to the value of EqD max, when a PON ONU access to the system, the power entering the ONU
  • the OLT sends the value of the above EqDi to the corresponding ONU.
  • the ONU adjusts the clock of the transmitted data according to the equalization delay sent by the OLT to implement the uplink transmission synchronization, and the ONU enters the working state.
  • the EPON system uses the following method to measure the ONU:
  • the OLT sends a multi-point control protocol data unit (MPCPDU) named "Gate” with a timestamp (time-stamp) to the TO at the TO time, and the OLT records the value of the TO at the time.
  • MPCPDU multi-point control protocol data unit
  • the ONU received on After the MPCPDU named Gate, the timestamp value TO is taken out, and the value of the local counter is updated to TO.
  • the ONU sends a MPCPDU named Report (Report) with the timestamp T1 at the time T1, and responds to the above name sent by the OLT.
  • Report Report
  • the OLT in the EPON calculates the RTT of the ONU
  • the PON system provides a protection mode, namely backbone fiber protection, as shown in Figure 2, protecting the backbone fiber between the OLT and the ODN, providing a redundant backbone fiber and a corresponding redundancy.
  • the OLT as shown in Figure 2, OLT0 and OLT1 are active and standby, one backbone fiber and the corresponding OLT work normally, and the other backbone fiber and the corresponding OLT are in standby state.
  • the OLT is performed. Protection switching, The backup trunk fiber and the standby OLT become the primary trunk fiber and the primary OLT.
  • the standby OLT cannot dynamically and automatically measure the distance of each ONU in the case of the active OLT. For example: If both the primary OLT and the standby OLT are used Sending the downlink frame to the ONU, because the same wavelength is used, it is impossible for the ONU to identify whether the currently received downlink frame is sent by the primary OLT or the standby OLT, so that an error occurs when responding to the downlink frame due to the main Both the OLT and the standby OLT can receive the uplink frame sent by the ONU in response, and the uplink frame that the ONU responds to the downlink frame sent by the standby OLT is simultaneously sent to the active OLT, which may cause the OLT to simultaneously receive the two ONUs.
  • the uplink data makes the OLT unable to correctly parse the uplink data.
  • the uplink data sent by the ONU in response to the backup OLT ranging may be sent by other ONUs.
  • the existing OLT cannot perform dynamic ranging for each ONU in real time.
  • the backup OLT is used as the primary OLT after the protection switchover, it is necessary to re-measure each ONU.
  • the time required is often long, and the quality of service (QoS, Quality of Service) cannot be guaranteed.
  • the main object of the present invention is to provide a ranging method and system in a PON, which can enable the standby OLT to perform dynamic ranging in real time for each ONU.
  • a ranging method in a passive optical network comprising: the primary optical line terminal (OLT) transmitting the information of the currently operating optical network unit (ONU) to the standby OLT during normal operation; the standby OLT Dynamic real-time ranging of the ONU to be tested is implemented according to the information of the ONU.
  • the method further includes: after the standby OLT is converted into the active OLT, the uplink time slot is allocated to the ONU to be tested according to the information of the ONU.
  • the allocating the uplink time slot includes: allocating uplink time slots for a part of the ONUs in the ONU to be tested, or allocating uplink time slots for all ONUs in the ONU to be tested.
  • the information of the ONU includes: identity information carried by the ONU to be tested, and identity information allocated by the primary OLT to the ONU to be tested.
  • the identity information carried by the ONU to be tested includes: a sequence number of the ONU, or a media access control address of the ONU.
  • the identity information that is allocated to the ONU to be tested includes: an ONU identifier of the ONU, or a logical link identifier of the ONU.
  • the dynamic real-time ranging for the ONU to be tested includes any one of the following methods:
  • Manner 1 The standby OLT monitors the downlink frame sent by the primary OLT, and records the time when the primary OLT sends the downlink frame.
  • the standby OLT listens to the uplink frame sent by the ONU to be tested, and records the backup. Receiving, by the OLT, the time for the ONU to send the uplink frame, according to the time when the primary OLT sends the downlink frame, and the time when the standby OLT receives the uplink frame sent by the ONU to be tested, where the standby OLT implements the opposite Describe the ranging of the ONU to be tested;
  • Manner 2 The primary OLT sends the time of sending the downlink frame to the standby OLT; the standby OLT records the time when the ONU that is to be tested sends the uplink frame, and sends the downlink frame according to the primary OLT. The time and the time when the ONU that is to be tested is sent to send the uplink frame, and the standby OLT implements ranging for the ONU to be tested.
  • the standby OLT sends the time that the ONU that is to be tested to the ONU sends the uplink frame to the active OLT; the primary OLT sends the ONU according to the test and the OLT received by the standby OLT.
  • the time between the uplink frame and the time when the primary OLT sends the downlink frame, and the ranging between the standby OLT and the ONU to be tested is implemented; the primary OLT sends the ranging result to The standby OLT.
  • a ranging system in a passive optical network comprising: an information sending unit and a ranging unit;
  • the information sending unit is configured to: when the primary OLT is in normal working, send information about the ONU currently in the working state to the standby OLT;
  • the ranging unit is configured by the standby OLT to implement dynamic real-time ranging of the ONU to be tested according to the information of the ONU.
  • the system further includes an allocating unit, configured to allocate an uplink time slot to the ONU to be tested according to the information of the ONU, and then allocate an uplink time slot according to the information of the ONU; A part of the ONUs in the ONU to be tested allocates an uplink time slot, or allocates an uplink time slot to all ONUs in the ONU to be tested.
  • an allocating unit configured to allocate an uplink time slot to the ONU to be tested according to the information of the ONU, and then allocate an uplink time slot according to the information of the ONU; A part of the ONUs in the ONU to be tested allocates an uplink time slot, or allocates an uplink time slot to all ONUs in the ONU to be tested.
  • the information of the ONU includes: identity information carried by the ONU to be tested, and identity information allocated by the primary OLT to the ONU to be tested.
  • the ranging unit is further configured to implement dynamic real-time ranging of the ONU to be tested by using any one of the following manners;
  • Manner 1 The standby OLT monitors the downlink frame sent by the primary OLT, and records the time when the primary OLT sends the downlink frame.
  • the standby OLT listens to the uplink frame sent by the ONU to be tested, and records the backup. Receiving, by the OLT, the time for the ONU to send the uplink frame, according to the time when the primary OLT sends the downlink frame, and the time when the standby OLT receives the uplink frame sent by the ONU to be tested, where the standby OLT implements the opposite Describe the ranging of the ONU to be tested;
  • Manner 2 The primary OLT sends the time of sending the downlink frame to the standby OLT; the standby OLT records the time when the ONU that is to be tested sends the uplink frame, and sends the downlink frame according to the primary OLT. The time and the time when the ONU that is to be tested is sent to send the uplink frame, and the standby OLT implements ranging for the ONU to be tested.
  • the standby OLT receives the uplink frame from the ONU to be tested.
  • the time is sent to the primary OLT; the primary OLT sends the uplink frame according to the time that the ONU and the OLT received by the standby OLT and the primary OLT send the downlink frame, and implements the standby OLT and the standby.
  • the active OLT of the present invention sends the information of the currently active ONU to the standby OLT during normal operation; the standby OLT implements dynamic real-time ranging of the ONU to be tested according to the information of the ONU.
  • the standby OLT implements dynamic real-time ranging of the ONU to be tested in advance, and the backup OLT does not need to re-ranging after the protection switching, and the existing OLT can be avoided.
  • the backup OLT when the backup OLT is used as the primary OLT after the switchover, it is necessary to re-range each ONU to work properly to affect the QoS problem, reduce the handover time, and ensure the QoS of the system bearer service.
  • FIG. 1 is a structural diagram of a structure of a PON in the prior art
  • FIG. 2 is a system architecture diagram of a PON including a backbone fiber in the prior art
  • FIG. 3 is a schematic diagram of an implementation process of an example of a method according to the present invention. detailed description
  • the basic idea of the present invention is:
  • the primary OLT sends the information of the currently active ONU to the standby OLT during normal operation;
  • the standby OLT implements dynamic real-time ranging of the ONU to be measured according to the information of the ONU.
  • An example of a ranging method in a PON includes the following steps: Step 100: When the primary OLT is in normal working, the information about the ONU currently in the working state is sent to the standby OLT. Step 200: The standby OLT implements dynamic real-time measurement of the ONU to be tested according to the information of the ONU.
  • the specific processing procedure of the step 200 may be: the standby OLT learns the ONU to be tested according to the information of the ONU, and if the primary OLT works normally and the standby OLT does not send the downlink frame to the ONU to be tested, The standby OLT completes dynamic real-time measurement of the ONU to be tested.
  • the ONU to be tested described in this document refers to the ONU currently in working state, and will not be described.
  • the uplink time slot is allocated to the ONU to be tested according to the information of the ONU.
  • the uplink time slot may be allocated to some or all of the ONUs in the ONU to be tested.
  • the information of the ONU includes: the identity information carried by the ONU to be tested and the identity information of the ONU to be tested by the primary OLT.
  • the identity information carried by the ONU to be tested includes, but is not limited to, the serial number of the ONU or the medium access control (MAC) address of the ONU.
  • MAC medium access control
  • the identity information allocated to the ONU to be tested includes but is not limited to the ONU-ID of the ONU or the LLID of the ONU.
  • the dynamic OLT of the standby OLT completes the dynamic real-time ranging of the ONU to be tested, and includes any one of the following manners:
  • Manner 1 The standby OLT monitors the downlink frame sent by the primary OLT, and records the time when the primary OLT sends the downlink frame.
  • the standby OLT listens to the uplink frame sent by the ONU to be tested, and records the standby OLT receiving the to-be-received frame.
  • Manner 2 The primary OLT sends the time of sending the downlink frame to the standby OLT; the backup OLT records And receiving, by the ONU, the time when the uplink frame is sent by the to-be-tested OLT; and the time for receiving the uplink frame by the primary OLT and the time for receiving the uplink frame by the ONU to be tested, where the standby OLT implements the Measuring the distance of the ONU.
  • the standby OLT sends the time when the uplink frame is sent to the active OLT by the ONU, and the time that the primary OLT sends the uplink frame according to the ONU and the standby OLT.
  • the time range of the downlink frame is sent by the OLT, and the ranging between the standby OLT and the ONU to be tested is implemented.
  • the primary OLT sends the ranging result to the standby OLT.
  • time synchronization is maintained between the primary OLT and the standby OLT.
  • the invention is illustrated by way of example below.
  • the first embodiment of the present invention is the application scenario of the first mode and the second mode.
  • the main steps for the protection switching of the protection backbone fiber shown in Figure 2 include:
  • Step 101 The backup OLT and the primary OLT maintain time synchronization through a communication channel between them, or the backup OLT and the primary OLT maintain time synchronization with a common switching device such as an aggregation switching device, or both the standby OLT and the primary OLT are
  • the common network management system is kept in sync.
  • the primary OLT sends the MAC address and LLID of the working ONU to the standby OLT.
  • Step 102 The primary OLT sends an MPC PDU named Gate with a timestamp (time-stamp) to the TO at the TO time, and the standby OLT listens to the MPC PDU sent by the primary OLT, or the time OT that the primary OLT will send the Gate. Sended to the standby OLT, the standby OLT records the value of time T0.
  • time-stamp timestamp
  • Step 103 After receiving the MPCPDU named Gate, the ONU takes the value T0 of the timestamp and updates the value of the local counter to TO. The ONU sends a timestamp with the timestamp T1 at the time T1 (Report) The MPCPDU responds to the above-mentioned MPCPDU named Gate by the OLT.
  • Step 104 The standby OLT monitors that the primary OLT receives the ONU transmission at the time T2.
  • the content, or the primary OLT sends the time T2 of receiving the content to the standby OLT.
  • the standby OLT receives the content sent by the ONU at time T2, and the value of the standby OLT records ⁇ 2 and ⁇ 2.
  • the standby OLT stores the value of the above RTT.
  • Step 106 After the protection switching occurs, the standby OLT becomes the active OLT, and all the ONUs that are in working state before the protection switching directly enter the working state, and the primary OLT directly allocates the uplink time slot to the ONU.
  • Embodiment 2 An EPON embodiment, an application scenario of the foregoing mode 3.
  • the main steps for the protection switching of the protection backbone fiber shown in Figure 2 include:
  • Step 201 The backup OLT and the primary OLT maintain time synchronization through a communication channel between them, or the backup OLT and the primary OLT maintain time synchronization with a common switching device such as an aggregation switching device, or both the standby OLT and the primary OLT are
  • the common network management system is kept in sync.
  • the primary OLT sends the MAC address and LLID of the working ONU to the standby OLT.
  • Step 202 The primary OLT sends an MPCPDU named Gate with a timestamp (time-stamp) to the ONU at the time of the TO, and the primary OLT records the value of the time T0.
  • timestamp time-stamp
  • Step 203 After receiving the MPCPDU named Gate, the ONU takes the timestamp value T0 and updates the value of the local counter to TO. The ONU sends a timestamp named T1 to the T1 at the time T1 (Report) The MPCPDU responds to the above-mentioned MPCPDU named Gate by the OLT.
  • Step 204 The primary OLT receives the foregoing content sent by the ONU at time T2, and the standby OLT receives the content sent by the ONU at time T2, and sends the value of ⁇ 2 to the primary OLT.
  • the primary OLT sends the RTT between the backup OLT and the ONU to the standby OLT.
  • Step 206 The standby OLT receives and stores the RTT value sent by the primary OLT. After the protection switching occurs, the standby OLT becomes the active OLT. All ONUs that are in working state before the protection switching enter the working state directly. The active OLT directly allocates the uplink time slot to the ONU.
  • Embodiment 3 GPON embodiment, an application scenario of the foregoing mode 1.
  • Step 301 The backup OLT and the primary OLT maintain time synchronization through a communication channel between them, or the backup OLT and the primary OLT maintain time synchronization with a common switching device such as an aggregation switching device, or both the standby OLT and the primary OLT are
  • the common network management system is kept in sync.
  • the primary OLT sends the serial number of the ONU in the working state and the ONU-ID to the standby OLT.
  • the primary OLT tests the maximum EqD value of the primary channel EqD max i; fl , and each ONU in the working state on the primary channel. The obtained EqD is sent to the standby OLT.
  • Step 302 The standby OLT listens to the primary OLT to send a ranging request (Ranging_Request) to the ONU in the working state, where the ranging request is a bandwidth allocation (start time is StartTime, end time is StopTime), and the standby OLT records the primary use. Time point T at which the OLT sends the ranging request
  • Step 303 After receiving the ranging request, the ONU passes the fixed response time and is set to T resp ), waits for the corresponding EqD time and the StartTime allocated by the ranging request, and then responds to the ranging response, and the sent message is Serial_Number. — ONU message.
  • Step 304 when receiving a ranging response time monitor primary backup OLT to the ONU transmission received by the OLT T 2, the value of the standby OLT ⁇ 2 is recorded, and recording a reception time of their transmission to the ONU receives the ranging response ⁇ 3
  • the standby OLT calculates the EqD value EqD between itself and the ONU.
  • EqD Alternate EqD max Active - (T 2 -Ti) + EqD + StartTime- ( 1 + i Down / i Up) x (T 3 - T 2 )_ (EqD max Standby - EqD max Active);
  • EqD max is prepared; 3 ⁇ 4 is the maximum EqD value of the alternate channel, EqD is the time value of the EqD measured by the ONU in the active state on the active channel, i ⁇ acts as the refractive index of the ascending light in the fiber, and acts under i The refractive index of the descending light in the fiber.
  • Step 305 The standby OLT prepares the EqD value EqD of the ONU on the alternate channel calculated in step 304; 3 ⁇ 4 is sent to the active OLT, and the primary OLT sends the EqD backup; 3 ⁇ 4 to the corresponding 0.
  • Step 306 The ONU receives the EqD backup sent by the active OLT in step 305; after storing the EqD standby value.
  • Step 307 After the protection switching is performed, the standby OLT becomes the primary OLT, and the primary OLT notifies all the ONUs that are in the working state before the protection switching to switch the EqD value of the standby channel to the active channel, and directly enters the working state, and the primary OLT
  • the ONU is assigned an uplink time slot.
  • the standby OLT performs ranging on the ONU in the working state.
  • the standby OLT may also use the standby OLT to measure the ONU in the ranging state during registration activation.
  • the primary OLT sends the value T prc of the pre-allocation delay of the ONU assigned to the ranging state in the registration activation process to the standby OLT, and in step 304, T prc is used instead of EqD.
  • a ranging system in a PON comprising: an information sending unit and a ranging unit; wherein the information sending unit is configured to send the information of the currently active ONU to the standby OLT during normal operation of the active OLT.
  • the ranging unit is used by the standby OLT to implement dynamic real-time ranging of the ONU to be tested according to the information of the ONU.
  • the ONU to be tested is an ONU currently in a working state.
  • the system further includes an allocating unit, wherein the allocating unit is configured to allocate an uplink time slot to the ONU to be tested according to the information of the ONU, and then allocate an uplink time slot according to the information of the ONU; When an uplink time slot is used, an uplink time slot is allocated to a part of the ONUs in the ONU to be tested, or an uplink time slot is allocated to all ONUs in the ONU to be tested.
  • the information of the ONU specifically includes: identity information carried by the ONU to be tested, and identity information allocated by the primary OLT to the ONU to be tested.
  • the ranging unit is further configured to implement dynamic real-time ranging of the ONU to be tested in any of the following manners.
  • Manner 1 The standby OLT monitors the downlink frame sent by the primary OLT, and records the time when the primary OLT sends the downlink frame.
  • the standby OLT listens to the uplink frame sent by the ONU to be tested, and records the standby OLT receiving the to-be-received frame.
  • Manner 2 The primary OLT sends the time of sending the downlink frame to the standby OLT; the standby OLT records the time when the ONU that is to be tested is sent to send the uplink frame; according to the time when the primary OLT sends the downlink frame and receives the The time at which the ONU to be tested sends the uplink frame, and the standby OLT implements ranging for the ONU to be tested.
  • the standby OLT sends the time when the uplink frame is sent to the active OLT by the ONU, and the time that the primary OLT sends the uplink frame according to the ONU and the standby OLT.
  • the time range of the downlink frame is sent by the OLT, and the ranging between the standby OLT and the ONU to be tested is implemented.
  • the primary OLT sends the ranging result to the standby OLT.

Abstract

La présente invention se rapporte à un procédé de mesure de distance dans un réseau optique passif (PON, Passive Optical Network). Le procédé selon l'invention comprend les étapes suivantes : quand une terminaison de ligne optique (OLT, Optical Line Terminal) principale fonctionne normalement, elle envoie à une OLT en attente les informations d'une unité de réseau optique (ONU, Optical Network Unit) qui se trouve à ce moment précis dans un état de fonctionnement (100); sur la base des informations de l'ONU, l'OLT en attente met en œuvre une mesure de distance dynamique et en temps réel sur l'ONU devant être mesurée (200). La présente invention se rapporte également à un système de mesure de distance dans le PON. Dans le système de mesure de distance selon l'invention, un module d'envoi d'informations est utilisé pour envoyer à l'OLT en attente les informations de l'ONU qui se trouve à ce moment précis dans un état de fonctionnement quand l'OLT principale fonctionne normalement. Le procédé et le système selon la présente invention permettent d'amener l'OLT en attente à exécuter une mesure de distance dynamique et en temps réel sur chaque ONU.
PCT/CN2011/071838 2010-08-11 2011-03-15 Procédé et système de mesure de distance dans un réseau optique passif WO2012019458A1 (fr)

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WO2010047950A2 (fr) * 2008-10-21 2010-04-29 Teknovus, Inc. Procede et systeme de commutation de protection dans des reseaux optiques passifs ethernet
CN101873166A (zh) * 2009-04-21 2010-10-27 中兴通讯股份有限公司 一种吉比特无源光网络系统的测距方法

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CN103701519A (zh) * 2013-12-18 2014-04-02 烽火通信科技股份有限公司 无源光网络的主备用判决方法
CN103701519B (zh) * 2013-12-18 2016-05-04 烽火通信科技股份有限公司 无源光网络的主备用判决方法

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