WO2016024162A1 - Method and apparatus for determining a rogue onu in a pon - Google Patents

Method and apparatus for determining a rogue onu in a pon Download PDF

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Publication number
WO2016024162A1
WO2016024162A1 PCT/IB2015/001547 IB2015001547W WO2016024162A1 WO 2016024162 A1 WO2016024162 A1 WO 2016024162A1 IB 2015001547 W IB2015001547 W IB 2015001547W WO 2016024162 A1 WO2016024162 A1 WO 2016024162A1
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WO
WIPO (PCT)
Prior art keywords
onu
determining
time slot
condition
infected zone
Prior art date
Application number
PCT/IB2015/001547
Other languages
English (en)
French (fr)
Inventor
Xiao Chen
Simiao XIAO
Qingjiang Chang
Kaibin Zhang
Original Assignee
Alcatel Lucent
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Lucent filed Critical Alcatel Lucent
Priority to JP2017508500A priority Critical patent/JP6431184B2/ja
Priority to US15/327,712 priority patent/US9992561B2/en
Priority to EP15784755.9A priority patent/EP3180924B1/en
Publication of WO2016024162A1 publication Critical patent/WO2016024162A1/en

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Classifications

    • 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
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1408—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic by monitoring network traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • 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
    • H04Q2011/0083—Testing; Monitoring

Definitions

  • the present invention relates to a passive optical network, and particularly to a method and apparatus for determining a rogue ONU in a PON.
  • TDM Time Division Multiplexing
  • PON Passive Optical Network
  • the Optical Line Terminal talks to OUNs in a broadcast manner over the downstream wavelength on optical fiber. And each ONU talks to the OLT within a given time slot allocated by the OLT over upstream wavelength (normally, upstream and downstream wavelength is different on the same trunk fiber). If a rogue ONU intentionally or unintentionally transmits optical signals to the OLT in the time slot which is allocated to other ONUs, the upstream service transmitted by other ONUs over this trunk fiber will be disturbed seriously.
  • Rogue ONU typically refers to an ONU which is transmitting in a manner not consistent with parameters specified in the standard. In the actual PON, it is an important issue to be solved, as the rogue ONU prevents the normal communications between the ONUs and the OLT.
  • the rogue behavior of the rogue ONU can be caused by many reasons such as MAC error, software error, transmitter error, and so on. The most common case happens both in the TDM-PON and in the TWDM-PON is that the rogue ONU transmits its upstream signal in wrong time slots, as shown in Fig 1. Normally, the failed transmitter turns on ahead of schedule because of the software or hardware error; or it turns off later than the schedule because of the component aging or other reasons.
  • the upstream bursts from other ONUs which are adjacent to the rogue ONU will be disturbed and cannot be received correctly by the OLT.
  • determining a rogue ONU can be difficult since the affected ONUs are not always the ONUs which cause the disturbance.
  • the present application provides a method and apparatus for determining a rogue ONU in a PON.
  • a method for determining a rogue ONU in an OLT of a PON the OLT receiving uplink signals of multiple ONUs, the method comprising the steps of: D. determining an original infected zone based on a first time slot allocation in which each time slot corresponds to an uplink signal of one ONU; B. determining a new infected zone based on a second time slot allocation in which each time slot corresponds to an uplink signal of one ONU; F. determining if there is a same ONU in the original infected zone and the new infected zone to determine a rogue ONU candidate; and G. determining rogue ONU based on the rogue ONU candidate.
  • the method further comprises step A before the step D, the step A comprises: determining that a first condition is satisfied based on a current time slot allocation, the first condition being whether an uplink error rate of any ONU controlled by the OLT is larger than an error rate threshold; if the first condition is satisfied, determining whether a second condition is satisfied, the second condition being whether a difference value between an optical power value and respective historical optical power value of an uplink signal of every ONU is larger than a pre-defined optical power threshold.
  • the method further comprises step B, the step B comprises: determining an ONU which corresponds to a difference value larger than a predefined optical power threshold as a first source ONU, when the second condition is satisfied; not determining an ONU which corresponds to a difference value as a first source ONU, when the second condition is not satisfied.
  • the method further comprises determining the first source ONU and an ONU which corresponds to adjacent time slots of a time slot of the first source ONU in the first time slot allocation as the original infected zone.
  • the step E comprises: El . changing the first time slot allocation to generate the second time slot allocation, and informing every ONU of the second time slot allocation.
  • the method further comprises performing step A and step B after the step El .
  • the step E further comprises: determining an ONU which corresponds to a difference value larger than a predefined optical power threshold as a second source ONU, when the second condition is satisfied; not determining an ONU which corresponds to a difference value as a second source ONU, when the second condition is not satisfied.
  • the step E further comprises: determining the second source ONU and an ONU which corresponds to adjacent time slots of a time slot of the second source ONU in the second time slot allocation as the new infected zone.
  • the step F further comprises determining whether there is a same ONU between the original infected zone and the new infected zone: if yes, determining a same ONU in the original infected zone and in the new infected zone as a rogue ONU candidate; if no, performing the step E again.
  • the step G comprises closing in turn the rogue ONU candidates and checking error rates of other ONUs except the closed ONU; if all error rates of the other ONUs are not larger than the error rate threshold, determining the closed rouge ONU candidate as the rouge ONU.
  • an apparatus for determining a rogue ONU in an OLT of a PON the OLT receiving uplink signals of multiple ONUs
  • the apparatus comprising: an original infected zone determination unit for determining an original infected zone based on a first time slot allocation in which each time slot corresponds to an uplink signal of one ONU; a second time slot determination unit for changing the first time slot allocation to generate a second time slot allocation, and informing each ONU of the second time slot allocation; a new infected zone determination unit for determining a new infected zone based on a second time slot allocation in which every time slot corresponds to an uplink signal of one ONU; a determination unit for determining if there is a same ONU in the original infected zone and in the new infected zone to determine a rogue ONU candidate; and an ONU determination unit for determining a rogue ONU based on the rogue ONU candidate.
  • the apparatus further comprises: a first condition determination unit for determining whether the first condition is satisfied based on a current time slot allocation, the first condition being whether an uplink error rate of any ONU controlled by the OLT is larger than an error rate threshold; a second condition determination unit for determining whether a second condition is satisfied if the first condition is satisfied, the second condition being whether a difference value between an optical power value and respective historical optical power value of an uplink signal of every ONU is larger than a pre-defined optical power threshold.
  • the original infected zone determination unit further comprises: determining an ONU which corresponds to a difference value larger than a predefined optical power threshold as a first source ONU, when the second condition is satisfied; not determining an ONU which corresponds to a difference value as a first source ONU, when the second condition is not satisfied.
  • the original infected zone determination unit further comprises determining the first source ONU and an ONU which corresponds to adjacent time slots of a time slot of the first source ONU in the first time slot allocation as the original infected zone.
  • the new infected zone determination unit further comprises: determining an ONU which corresponds to a difference value larger than a predefined optical power threshold as a second source ONU when the second condition is satisfied; not determining an ONU which corresponds to a difference value as a second source ONU when the second condition is not satisfied.
  • the new infected zone determination unit further comprises determining the second source ONU and an ONU which corresponds to adjacent time slots of a time slot of the second source ONU in the second time slot allocation as the new infected zone.
  • the determination unit further comprises determining whether there is a same ONU in the original infected zone and in the new infected zone: if yes, determining a same ONU in the original infected zone and the new infected zone as a rogue ONU candidate.
  • the ONU determination unit comprises closing in turn the rogue ONU candidates and checking error rates of other ONUs except the closed ONU; if all error rates of the other ONUs are not larger than the error rate threshold, determining the closed rouge ONU candidate as the rouge ONU.
  • TDM-PON system but also in a TWDM-PON (NG-PON2) system.
  • I ig. 1 illustrates a schematic view of a typical scenario of a rouge ONU behavior in a PON system
  • Fig.4 illustrates a schematic view of an infected zone according to an embodiment of the invention.
  • FIG.5 i llustrates a schematic view of determining a rouge ONU via changing DBA according to an embodiment of the invention
  • FIG.6 illustrates a schematic view of an apparatus for determining a rogue ONU in a PON
  • Fig.2 illustrates a schematic view of embedded memory chip in an OLT according to an embodiment of the invention, wherein a memory chip records historical error rates and error rate threshold of each ONU, the micro-processor determines the error rate threshold based on the historical error rates. Similarly, a memory chip records the historical optical power value and optical power threshold of each ONU.
  • FIG.3 illustrates a flow chart of a method for determining a rogue ONU according to an embodiment of the invention, wherein the OLT in the PON controls multiple ONUs.
  • the OLT determines an original infected zone based on a first time slot allocation in which each time slot corresponds to an uplink signal of one ONU.
  • the OLT continuously determines whether an uplink error rate of other ONU controlled by the OLT is larger than the error rate threshold, this round of the determination is ended until the uplink error rates of all ONUs controlled by the OLT are checked.
  • step S212 the OLT determines whether a second condition is satisfied, the second condition is that a difference value between an optical power value and respective historical optical power value of an uplink signal of every ONU is larger than a pre-defined optical power threshold.
  • the OLT does not determine an ONU which corresponds to a difference value as a first source ONU. And the OLT continuously determines whether an uplink error rate of other ONU controlled by the OLT is larger than the error rate threshold, this round of the determination is ended until the uplink error rates of all ONUs controlled by the OLT are checked.
  • the OLT determines an ONU which corresponds to a difference value larger than the predefined optical power threshold as a first source ONU.
  • the OLT determines that the first source ONU and an ONU which corresponds to adjacent time slots of a time slot of the first source ONU in the first time slot allocation as the original infected zone.
  • the ONU3 satisfies the first condition and the second condition simultaneously.
  • the OLT marks the ONU3 as a first source ONU. Meanwhile, the OLT also marks ONU2 and ONU4 whose time slot are adjacent to the time slot of ONU3.
  • ONU2, ONU3 and ONU4 compose an original infected zone. Every ONU in the original infected zone has potential risk to be a rogue ONU. !! ⁇ The skilled art should appreciate that "adjacent" in the present application is not limited to the ONUs at both sides of the first source ONU which satisfies the first condition and the second condition simultaneously. That is, in a needed basis, the original infected zone can be determined as ONU1, ONU2, ONU3 and ONU5.
  • the OLT changes the first time slot allocation to generate a second time slot allocation, and informing every ONU of the second time slot allocation, wherein the second time slot allocation is different from the first time slot allocation.
  • step S230 the OLT determines a new infected zone based on the second time slot allocation in which each time slot corresponds to an uplink signal of one ONU.
  • the OLT determines whether the first condition is satisfied based on a current time slot allocation, the first condition is that an uplink error rate of an ONU controlled by the OLT is larger than an error rate threshold.
  • the OLT continuously determines whether an uplink error rate of other ONU controlled by the OLT is larger than the error rate threshold, this round of the determination is ended until the uplink error rates of all ONUs controlled by the OLT are checked.
  • the OLT determines whether the second condition is satisfied, the second condition is that a difference value between an optical power value and respective historical optical power value of an uplink signal of every ONU is larger than a pre-defined optical power threshold.
  • the OLT does not determine an ONU which corresponds to a difference value as a second source ONU. And the OLT continuously determines whether an uplink error rate of other ONU controlled by the OLT is larger than the error rate threshold, this round of the determination is ended until the uplink error rates of all ONUs controlled by the OLT are checked.
  • the OLT determines an ONU which corresponds to a difference value larger than the predefined optical power threshold as a second source ONU.
  • the OLT determines the second source ONU and the ONU which corresponds to adjacent time slots of a time slot of the second source ONU in the second time slot allocation as the new infected zone.
  • ONU5 satisfies the first condition and the second condition simultaneously, thus the OLT marks the ONU5 as the a second source ONU. Meanwhile, the OLT also marks ONU2 and ONU7 whose time slots are adjacent to the time slot of ONU5 as a rogue ONU. Thus, ONU2, ONU5 and ONU7 compose anew infected zone. Every ONU in the original infected zone has potential risk to be a rogue ONU.
  • the OLT determines whether there is a same ONU in the original infected zone and in the new infected zone in order to determine a rogue ONU candidate.
  • the OLT determines the same ONU in the original infected zone and in the new infected zone as a rogue ONU candidate. For example, as shown in Table 1, ONU2 appears both in the original infected zone and in the new infected zone, ONU2 is determined as the rogue ONU candidate.
  • step S220 to step S240 are performed again, i.e., the OLT changes the first time slot allocation again to generate a time slot allocation, which is different from the first time slot allocation and the second time slot allocation, for determining a rogue ONU.
  • 711 Fig.6 illustrates a schematic view of an apparatus for determining a rogue ONU in a PON.
  • the apparatus 600 may be or may implement OLT in the embodiment described in the aforementioned description in conjunction with Figs 2-5.
  • the apparatus 600 comprises an original infected zone determination unit 610 for determining an original infected zone based on a first time slot allocation in which each time slot corresponds to an uplink signal of one ONU; a second time slot determination unit 620 for changing the first time slot allocation to generate a second time slot allocation, and informing every ONU of the second time slot allocation; a new infected zone determination unit 630 for determining a new infected zone based on a second time slot allocation in which each time slot corresponds to an uplink signal of one ONU; a determination unit 640 for determining if there is a same ONU in the original infected zone and the new infected zone to determine a rogue ONU candidate; and an ONU determination unit 650 for determining a rogue ONU based on the rogue ONU candidate.
  • the apparatus 600 further comprises a first condition determination unit for determining whether the first condition is satisfied based on a current time slot allocation, the first condition is that an uplink error rate of any ONU controlled by the OLT is larger than an error rate threshold; a second condition determination unit for determining whether a second condition is satisfied if the first condition is satisfied, the second condition is that a difference between an optical power value of an uplink signal of every ONU and respective historical optical power value is larger than a pre-defined optical power threshold.
  • the apparatus 600 determines an ONU which corresponds to a difference value larger than a predefined optical power threshold as a first source ONU; when the second condition is not satisfied, the apparatus 600 does not determines an ONU which corresponds to a difference value as a first source ONU.
  • the original infected zone determination unit 610 further comprises determining the first source ONU and an ONU which corresponds to adjacent time slots of a time slot of the first source ONU in the first time slot allocation as the original infected zone. 1761
  • the new infected zone determination unit 630 further comprises determining an ONU which corresponds to a difference value larger than a predefined optical power threshold as a second source ONU when the second condition is satisfied; not determining an ONU which corresponds to a difference value as a second source ONU when the second condition is not satisfied.
  • the new infected zone determination unit 630 further comprises determining the second source ONU and ONU which corresponds to adjacent time slots of a time slot of the second source ONU in the second time slot allocation as the new infected zone.
  • the determination unit 640 further comprises determining whether there is a same ONU in the original infected zone and in the new infected zone: if yes, determining a same ONU in the original infected zone and the new infected zone as a rogue ONU candidate.
  • the ONU determination unit 650 comprises closing in turn the rogue ONU candidates and checking error rate of other ONU except the closed ONU; if all error rates of the other ONUs are not larger than the error rate threshold, determining the closed rouge ONU candidate as the rouge ONU.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)
PCT/IB2015/001547 2014-08-15 2015-08-03 Method and apparatus for determining a rogue onu in a pon WO2016024162A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2017508500A JP6431184B2 (ja) 2014-08-15 2015-08-03 Ｐｏｎにおける不正なｏｎｕを決定するための方法および装置
US15/327,712 US9992561B2 (en) 2014-08-15 2015-08-03 Method and apparatus for determining a rogue ONU in a PON
EP15784755.9A EP3180924B1 (en) 2014-08-15 2015-08-03 Method and apparatus for determining a rogue onu in a pon

Applications Claiming Priority (2)

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CN201410403806.5 2014-08-15
CN201410403806.5A CN105337657B (zh) 2014-08-15 2014-08-15 在无源光网络中用于确定流氓onu的方法及装置

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US (1) US9992561B2 (zh-TW)
EP (1) EP3180924B1 (zh-TW)
JP (1) JP6431184B2 (zh-TW)
CN (1) CN105337657B (zh-TW)
WO (1) WO2016024162A1 (zh-TW)

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US9992561B2 (en) 2018-06-05
CN105337657A (zh) 2016-02-17
JP2017529766A (ja) 2017-10-05
EP3180924B1 (en) 2022-01-12
EP3180924A1 (en) 2017-06-21
CN105337657B (zh) 2018-08-24
JP6431184B2 (ja) 2018-11-28
US20170201814A1 (en) 2017-07-13

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