WO2015022807A1 - Dispositif station maîtresse, dispositif de commande, système de communication et procédé de communication - Google Patents

Dispositif station maîtresse, dispositif de commande, système de communication et procédé de communication Download PDF

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Publication number
WO2015022807A1
WO2015022807A1 PCT/JP2014/065594 JP2014065594W WO2015022807A1 WO 2015022807 A1 WO2015022807 A1 WO 2015022807A1 JP 2014065594 W JP2014065594 W JP 2014065594W WO 2015022807 A1 WO2015022807 A1 WO 2015022807A1
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WO
WIPO (PCT)
Prior art keywords
station device
wavelength
slave station
master station
change
Prior art date
Application number
PCT/JP2014/065594
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English (en)
Japanese (ja)
Inventor
向井　宏明
隆志 西谷
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Publication of WO2015022807A1 publication Critical patent/WO2015022807A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0282—WDM tree architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1301—Optical transmission, optical switches
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13097—Numbering, addressing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13292—Time division multiplexing, TDM

Definitions

  • the present invention relates to a master station device, a control device, a communication system, and a communication method that accommodate one or more slave station devices.
  • the PON system which is one of the communication systems, accommodates one or more ONUs (Optical Network Units) as slave station devices in the OLT (Optical Line Terminal) as the master station device.
  • ONUs Optical Network Units
  • OLT Optical Line Terminal
  • terminals One or more terminal devices (hereinafter referred to as terminals) can be connected.
  • the OLT assigns LLIDs (Logical Link IDs) to the subordinate ONUs to manage each ONU, and manages the terminals connected to each ONU by MAC address. That is, the OLT holds a correspondence table (MAC address table) between the LLID of each ONU and the MAC address of each terminal.
  • MAC address table MAC address table
  • the OLT When the OLT receives the downstream frame from the upper network, the OLT refers to the MAC address table, assigns the LLID associated with the destination address (DA: Destination Address) to the downstream frame, and broadcasts it to all ONUs. .
  • DA Destination Address
  • each ONU receives a downlink frame assigned with its own LLID, it forwards it to the subordinate terminal, and when it receives a downlink frame assigned with an LLID different from that assigned to itself. Discard without forwarding.
  • the OLT determines a time during which transmission to each ONU is permitted so that the upstream frame from each ONU does not collide, and each ONU transmits an upstream frame at the permitted time.
  • TDM Time Division Multiplexing
  • the conventional TDM PON system communicates using a single wavelength, but TWDM (Time and Wavelength Division Multiplexed) uses multiple wavelengths by wavelength multiplexing the conventional PON system.
  • TWDM Time and Wavelength Division Multiplexed
  • -A PON system has been proposed (see Patent Document 1 and Non-Patent Document 1).
  • the wavelength accommodating the ONU is changed according to the traffic situation. For example, the OLT first starts communication with a predetermined ONU using the wavelength of ⁇ 11. After that, when the traffic passing through ⁇ 11 increases and the transmission capacity becomes insufficient, communication with this ONU is performed. Change the wavelength to be used to ⁇ 12.
  • the LLID of each ONU, the wavelength used for communication with each ONU, and the MAC address of each terminal are registered in the MAC address table managed by the OLT.
  • the TWDM-PON system there can be considered a mode in which the OLT and the ONU use the same wavelength in the upstream and downstream in time division and a mode in which different wavelengths are used in the upstream and downstream.
  • the correspondence relationship between the LLID, the wavelength, and the MAC address registered in the MAC address table does not match the actual correspondence relationship, but the MAC address table is updated in response to reception of the upstream frame ( When an upstream frame is received, the MAC address is relearned). Therefore, the learning result before the wavelength change remains in the MAC address table until the upstream frame is received from the ONU whose wavelength has been changed after the wavelength change has occurred. I will send it. That is, there is a problem in that the downlink frame cannot be correctly transmitted until the uplink frame is transmitted.
  • the present invention has been made in view of the above, and a master station device, a control device, a communication system, and a communication capable of shortening a time required until data transmission / reception can be normally performed after a wavelength change occurs
  • the purpose is to obtain a method.
  • the master station device accommodates one or more slave station devices, and selects one wavelength selected from a plurality of candidates for each slave station device.
  • the slave station device When a slave station device that is assigned and communicates and detects a slave station device that needs to change the wavelength to be used, the slave station device is instructed to change the wavelength, and the terminal device under the slave station device is assigned its own address.
  • a wavelength management unit for notification is provided.
  • the control device is a control device in a master station device that accommodates one or more slave station devices, and assigns each wavelength selected from a plurality of candidates to each slave station device for communication.
  • a slave station device that needs to change the wavelength to be used is detected, the slave station device is instructed to change the wavelength, and the terminal device under the slave station device is notified of its own address.
  • the communication system is a communication system in which a master station device accommodates one or more slave station devices, and one wavelength selected from a plurality of candidates is assigned to each slave station device for communication.
  • the master station device when detecting a slave station device that needs to change the wavelength to be used, instructs the slave station device to change the wavelength, and causes the terminal device under the slave station device to notify its own address.
  • the communication method according to the present invention is a communication method in a communication system in which a master station device accommodates one or more slave station devices, and one wavelength selected from a plurality of candidates is assigned to each slave station device for communication.
  • the master station device the control device, the communication system, and the communication method according to the present invention, it is possible to reduce the service interruption time in which data cannot be transmitted / received after the wavelength change occurs.
  • FIG. 1 is a diagram showing a configuration example of a communication system according to the present invention.
  • FIG. 2 is a diagram illustrating an example of the MAC address table.
  • FIG. 3 is a diagram illustrating a hardware configuration example of the OLT.
  • FIG. 4 is a diagram illustrating an example of the wavelength switching operation.
  • FIG. 5 is a diagram illustrating an example of the updated MAC address table.
  • FIG. 6 is a flowchart illustrating an example of a control operation related to wavelength switching.
  • FIG. FIG. 1 is a diagram showing a configuration example of a communication system according to the present invention.
  • a TWDM-PON system using two waves will be described as an example, but the present invention can also be applied to a system using three or more waves.
  • the description will be made assuming that the same wavelength is used for uplink and downlink communication, the present invention can also be applied to a system using different wavelengths for uplink and downlink.
  • the TWDM-PON system is connected to an OLT 1 via an optical fiber 100 and a station side device (also referred to as “Optical Line Terminal”, hereinafter referred to as “OLT”) that operates as a master station device. .., 109,..., And a user side device (also referred to as “Optical Network Unit”, hereinafter referred to as “ONU”) 101, 102,.
  • the ONU 101 is assigned LLID # 1.
  • LLID # 2 and LLID # 9 are assigned to the ONU 102 and ONU 109, respectively.
  • One or more terminal devices (hereinafter referred to as terminals) can be connected to each ONU.
  • the MAC addresses of the terminals connected to the ONU 101 are MAC-ADDR # 1-1 to MAC-ADDR # 1-l
  • the MAC addresses of the terminals connected to the ONU 102 are MAC-ADDR # 2.
  • the MAC addresses of the terminals connected to the ONU 109 are MAC-ADDR # 9-1 to MAC-ADDR # 9-n.
  • the OLT 1 distributes a downlink frame received from a higher-order network that omits the description to a wavelength management unit 2 that determines and changes a wavelength to be used for communication with each ONU, and distributes each of the ONUs to one of a plurality of wavelengths.
  • a frame distribution unit 3 for transferring the received upstream frame to the upper network, and PON termination units 10 and 20 for terminating the PON control performed between the ONUs are provided.
  • the PON terminators 10 and 20 serving as frame transmission / reception means (frame transmission / reception units) communicate with the subordinate ONUs using different wavelengths. In the example of FIG. 1, the PON terminator 10 communicates with subordinate ONUs 101, 102,...
  • the PON terminator 10 and the PON terminator 20 use different wavelengths ⁇ # 1 and ⁇ # 2, so that two PON systems logically have the same optical fiber. Coexist in the network (optical fiber 100).
  • the frame distribution unit 3 holds a MAC address table (information storage unit) 4.
  • this MAC address table information on the distribution destination of the downstream frame received from the upper network is registered (see FIG. 2). ).
  • FIG. 2 is a diagram illustrating an example of information registered in the MAC address table 4.
  • the transmission destination terminals of frames destined for MAC-ADDR # 1-1 to MAC-ADDR # 1-l are connected to the ONU of LLID # 1, and the LLID # 1
  • the ONU is information indicating that it is accommodated in the PON terminator 10 (PON # 1), and the transmission destination terminal of the frame addressed to MAC-ADDR # 2-1 to MAC-ADDR # 2-m is LLID # 2.
  • PON # 1 Information indicating that the ONU connected to the ONU and the LLID # 2 is accommodated in the PON terminator 10 (PON # 1) is a frame addressed to MAC-ADDR # 9-1 to MAC-ADDR # 9-n Information indicating that the ONU of LLID # 9 is accommodated in the PON terminator 20 (PON # 2) is registered. Therefore, for example, when receiving a downstream frame whose destination address (DA: Destination Address) is MAC-ADDR # 1-1, the frame distribution unit 3 refers to the MAC address table 4 and associates the LLID associated with this destination address. Is assigned to the downstream frame and output to the distribution destination (PON termination unit 10 or 20) associated with MAC-ADDR # 1-1.
  • DA Destination Address
  • the configuration of the MAC address table 4 shown in the figure is merely an example, and any configuration can be used as long as the ONU in which the terminal of each MAC address is accommodated and the wavelength used by each ONU are known. Absent. Moreover, it may not be a table format.
  • Each ONU has a configuration in which the wavelength used for communication with the OLT 1 can be changed, and performs communication using the wavelength specified by the OLT 1. That is, FIG. 1 shows an example in which the ONUs 101 and 102 use the wavelength ⁇ # 1 and the ONU 109 uses the wavelength ⁇ # 2. However, all ONUs including the ONUs 101, 102, and 109 have the wavelength ⁇ # 1. Communication with OLT 1 is performed using one of ⁇ # 2 designated by OLT 1.
  • FIG. 3 is a diagram illustrating a hardware configuration example of the OLT 1.
  • the OLT 1 transmits a PON control unit (control device) 201 that performs processing on the OLT side based on the PON protocol, a reception buffer 202 for storing uplink data received from each ONU, and a transmission to the ONU.
  • a transmission buffer 203 for storing downlink data to be transmitted an optical transceiver 204 that performs optical signal transmission / reception processing, a WDM coupler (WDM) 205 that wavelength-multiplexes a plurality of optical signals having different wavelengths, and a network.
  • a physical layer processing unit (PHY) 206 that realizes a physical interface function of an NNI (Network Node Interface).
  • NNI Network Node Interface
  • the optical transceiver can transmit and receive a plurality of optical signals having different wavelengths.
  • the PON control unit 201 performs band allocation for giving transmission permission so that transmission time zones do not overlap each ONU for each group of ONUs having the same wavelength to be used, as in the conventional PON system.
  • the transmission data from the ONU is prevented from colliding.
  • the PON control unit 201 includes the wavelength management unit 2, the frame distribution unit 3, the PON termination unit 10, and the PON termination unit 20 illustrated in FIG. 1 and has functions of these components.
  • FIG. 4 is a diagram illustrating an example of a wavelength switching operation
  • FIG. 6 is a flowchart illustrating an example of a control operation related to wavelength switching. It is assumed that the OLT 1 and each ONU are communicating in the state shown in FIG. 1, and the operation when wavelength switching is performed from this state will be described.
  • the wavelength management unit 2 transmits traffic passing through the PON termination units 10 and 20. Monitoring. As a result of monitoring, for example, when the traffic passing through the PON termination unit 10 approaches the limit of the transmission capacity, the connection destinations of some of the ONUs connected to the PON termination unit 10 are changed (that is, used) It is determined that the wavelength to be changed is necessary. In this case, for example, it is determined to change the connection destination of the ONU 101 to the PON termination unit 20. Then, the wavelength management unit 2 instructs the ONU 101 via the PON termination unit 10 to switch the wavelength to be used to ⁇ # 2.
  • the ONU 101 Upon receiving this instruction, the ONU 101 changes the wavelength to be used to ⁇ # 2 ((1) in FIG. 4, step S1 in FIG. 6).
  • the instruction may be given by any method. For example, control information instructing wavelength switching is inserted into a downlink data frame to be received by the ONU 101 and transmitted.
  • the wavelength management unit 2 obtains the MAC address of each terminal connected to the ONU 101 from the PON terminating unit 20 that performs communication using the wavelength ⁇ # 2 after switching. For sending an address resolution control frame (ARP: Address Resolution Protocol request).
  • ARP Address Resolution Protocol request
  • the PON terminator 20 Upon receiving the instruction, the PON terminator 20 transmits an ARP request. This ARP request is received by all the ONUs (here, the ONUs 101 and 109) using the wavelength ⁇ # 2, and further forwarded to the terminal. Then, it reaches each terminal connected to the ONUs 101 and 109 ((2) in FIG. 4, step S2 in FIG. 6).
  • Each terminal that receives the ARP request (terminals whose MAC addresses are MAC-ADDR # 1-1 to # 1-1, # 9-1 to # 9-n) returns an ARP response including its own MAC address.
  • Each ARP response is received by the PON termination unit 20 of the OLT 1 as an upstream frame from the ONU 101 or 109 and passed to the frame distribution unit 3 ((3) in FIG. 4).
  • the frame distribution unit 3 When receiving the ARP response, the frame distribution unit 3 updates the held MAC address table 4 based on the MAC address notified by the ARP response ((4) in FIG. 4, step S3 in FIG. 6). When receiving an ARP response from each terminal under the ONU 101 where wavelength switching has occurred, the frame distribution unit 3 updates the MAC address table 4, and MAC-ADDR # 1-1 to MAC-ADDR # 1-1 are set as destination addresses. The set distribution destination of the frame is set to the PON termination unit 20 (see FIG. 5).
  • FIG. 5 is a diagram illustrating an example of the updated MAC address table. When an ARP response is received from each terminal under the ONU 109, the MAC address table 4 is not updated.
  • downstream frames addressed to MAC-ADDR # 1-1 to MAC-ADDR # 1-l are assigned LLID # 1 in the frame distribution unit 3 and then distributed to the PON termination unit 20 And transmitted from the PON terminator 20 at the wavelength ⁇ # 2.
  • the downlink frame assigned LLID # 1 is received by the ONUs 101 and 109 using the wavelength ⁇ # 2, and the ONU 101 assigned LLID # 1 transfers the received downlink frame to the destination terminal.
  • the ONU 109 to which LLID # 1 is not assigned discards the received downlink frame.
  • the OLT 1 monitors whether or not the wavelength used for communication with each ONU needs to be changed, and if the change is necessary, instructs the wavelength change.
  • a control frame for address resolution is broadcast using the wavelength after the change, and notification of the MAC address is instructed to each terminal under the ONU.
  • the MAC address table is updated based on the notified MAC address. Thereby, after wavelength switching, the information registered in the MAC address table, that is, the association between the MAC address of the terminal and the output destination of the downlink frame is immediately updated, and the service interruption time can be reduced.
  • an ARP request is periodically made from a server in the upper network, and the transmission interval of the ARP request is in minutes.
  • the OLT 1 broadcasts an ARP request to instruct each terminal under the ONU to notify the MAC address, and based on the received uplink frame, the MAC address Since the contents of the table are updated quickly, the service interruption time can be reduced to seconds or milliseconds.
  • the master station device according to the present invention is useful for a communication system capable of changing the wavelength of light used for communication with a slave station device.
  • 1 station side device OLT
  • 2 wavelength management unit 3 frame distribution unit
  • 4 MAC address table 10
  • 10 PON termination unit 100 optical fiber, 101, 102, 109 user side device (ONU), 201 PON control Part, 202 reception buffer, 203 transmission buffer, 204 optical transceiver, 205 WDM coupler (WDM), 206 physical layer processing part (PHY).
  • ONT station side device
  • WDM WDM coupler
  • PHY physical layer processing part

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention se rapporte à un dispositif station maîtresse ayant besoin de moins de temps pour reprendre une émission/réception de données normale après un changement de longueur d'onde. Ce dispositif station maîtresse (OLT) (1) contient un ou plusieurs dispositifs stations asservies (ONU) (101, 102... 109) et attribue une longueur d'onde sélectionnée parmi plusieurs candidates à chacun des dispositifs stations asservies afin de communiquer avec eux. Lorsqu'un dispositif station asservie a besoin de changer de longueur d'onde utilisée, le dispositif station maîtresse lui donne l'ordre de changer de longueur d'onde et l'amène à transmettre son adresse aux dispositifs terminaux dépendant de lui.
PCT/JP2014/065594 2013-08-12 2014-06-12 Dispositif station maîtresse, dispositif de commande, système de communication et procédé de communication WO2015022807A1 (fr)

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JP2013167705A JP2016181734A (ja) 2013-08-12 2013-08-12 親局装置、制御装置、通信システムおよび通信方法
JP2013-167705 2013-08-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108616308A (zh) * 2018-05-15 2018-10-02 国网黑龙江省电力有限公司哈尔滨供电公司 基于光纤通讯及无线专网技术融合的自动化终端通讯装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011259063A (ja) * 2010-06-07 2011-12-22 O F Networks Co Ltd 管理システム、センタ側装置、加入者側装置及び管理装置
WO2013108577A1 (fr) * 2012-01-17 2013-07-25 日本電信電話株式会社 Procédé d'allocation de bande passante de longueurs d'onde

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011259063A (ja) * 2010-06-07 2011-12-22 O F Networks Co Ltd 管理システム、センタ側装置、加入者側装置及び管理装置
WO2013108577A1 (fr) * 2012-01-17 2013-07-25 日本電信電話株式会社 Procédé d'allocation de bande passante de longueurs d'onde

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108616308A (zh) * 2018-05-15 2018-10-02 国网黑龙江省电力有限公司哈尔滨供电公司 基于光纤通讯及无线专网技术融合的自动化终端通讯装置

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