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WO2008011770A1 - Système faisant appel à des informations d'accessibilité de longueur d'onde et d'état d'occupation de longueur d'onde pour décrire des capacités de connexion transversale dans des réseaux optiques - Google Patents

Système faisant appel à des informations d'accessibilité de longueur d'onde et d'état d'occupation de longueur d'onde pour décrire des capacités de connexion transversale dans des réseaux optiques Download PDF

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Publication number
WO2008011770A1
WO2008011770A1 PCT/CN2007/000893 CN2007000893W WO2008011770A1 WO 2008011770 A1 WO2008011770 A1 WO 2008011770A1 CN 2007000893 W CN2007000893 W CN 2007000893W WO 2008011770 A1 WO2008011770 A1 WO 2008011770A1
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WO
WIPO (PCT)
Prior art keywords
wavelength
information
cross
connection information
node
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2007/000893
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English (en)
Inventor
Xinghua Shi
Baoquan Rao
Yu Wang
Chunhui Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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
Priority claimed from CN200610099398.4A external-priority patent/CN1878047A/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2008011770A1 publication Critical patent/WO2008011770A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • 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
    • 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
    • H04Q2011/0073—Provisions for forwarding or routing, e.g. lookup tables
    • 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
    • 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
    • H04Q2011/0086—Network resource allocation, dimensioning or optimisation

Definitions

  • the present invention relates generally to optical network communications, and more particularly, to a versatile system for utilizing wavelength reachable information to describe cross-connection capabilities in optical networks.
  • An Automatically Switched Optical Network is a type of dynamically and automatically switched transport network. It's a new generation optical network, where: a service request is originated dynamically by users; a path is calculated and selected automatically by a network element; setup, restoration and clearance of a connection are controlled by signaling; and switching and transporting are integrated.
  • An ASON includes two layers: a control plane and a transport plane. Main functions of a control plane include: collecting and distributing network topology of an ASON; forming a "network map" describing network topology; calculating a viable path through routing algorithms and by use of the "network map", and establishing an intelligent circuit using a signaling protocol for each node on the path.
  • Wavelength Division Multiplexing is a technology to transport services with various wavelengths. Rapid increases of image and data services cause tremendous demands for network bandwidth, and the conventional WDM technology is intended to meet such bandwidth demands.
  • a WDM device can be divided into a long-distance WDM device and a metropolitan WDM device.
  • a long-distance WDM device is commonly used as a national trunk or a regional trunk, for long-distance and high-capacity transmissions.
  • a metropolitan WDM device is mainly used for data service transmissions in rapidly developing metropolitan networks.
  • WDM networks are point-to-point static networks.
  • ROADM Reconfigurable Optical Add/Drop Multiplexer
  • WSS Widelength Selective Switching
  • a pure photonic GMPLS network may be abstracted into a logical or abstract cloud, and reachable information among access points of a Generalized Label Edge Router (GLER) is abstracted.
  • GLER Generalized Label Edge Router
  • this abstract model less information is distributed among GLER nodes. Due to insufficient information distributed, however, a label set would have to be used to restrict selection of wavelengths at setup time. Thus, even if such a restriction is applied, the rate for establishing a successful service path is low.
  • a Generalized Label Switching Router (GLSR) node in a pure photonic GMPLS network may be abstracted into a logical/abstract GLSR node, and reachable information of links associated with a logical GLSR node is abstracted and distributed to other nodes.
  • Information involved in this abstract model is large, but relatively complete. Therefore a higher rate of successful path calculations may be obtained when compared with the first model.
  • a link may be reachable, it does not necessarily mean that wavelength is reachable. Thus an established service path may not necessarily be viable. For this reason, a crankback technology may need to be used, to repeatedly attempt to establish a service path.
  • An embodiment of the present invention provides a system, comprising various constructs and methods, for communicating cross-connection information within an optical network, using wavelength information.
  • the present invention abstracts the cross-connection information to produce wavelength reachability information, and wavelength occupation status information, for each node within the optical network, and distributes the wavelength reachability and wavelength occupation status information of each node to all other nodes, or a Path Calculation Equipment (PCE) of the optical network, through extended routing protocols.
  • PCE Path Calculation Equipment
  • An embodiment of the present invention provides wavelength reachability and wavelength occupation status information to describe cross-connection capabilities and constraints in wavelength division multiplexing devices, carries the information by adding some new fields in routing protocols, such as an Open Shortest Path First (OSPF), and distributes wavelength reachability information and wavelength occupation status information separately using the routing protocols. This decreases the amount of information distributed, improves network efficiency, and provides a base for feasible service path calculations in case of cross-connection constraints.
  • OSPF Open Shortest Path First
  • An embodiment of the present invention is further applicable to communicate sub-wavelength reachability information and sub-wavelength occupation status information.
  • FIG. 1 is a diagram of a wavelength division multiplexing device illustrating cross-connection capabilities and cross-connection constraints among a plurality of traffic engineering links.
  • Wavelength Division Multiplexing (WDM) device may be abstracted into wavelength reachability and wavelength occupation status information.
  • the wavelength reachability and wavelength occupation status information may be distributed over a WDM network through a routing protocol, such as an extended Open Shortest Path First (OSPF) protocol; and may serve as a base of service path calculations for intelligent routing algorithms, so that wavelength services/sub-wavelength services may be automatically established or restored.
  • OSPF Open Shortest Path First
  • the embodiment of the present invention effectively solves problems where difficulty exists in calculating service paths in a WDM network with cross-connection constraints, and facilitates an intelligent WDM network.
  • a resource management system acquires cross-connection capabilities and constraints of a WDM device; abstracts the acquired cross-connection information into wavelength reachability and wavelength occupation status information; and stores the wavelength reachability and wavelength occupation status information into a local data structure when the system is initialized.
  • the resource management system updates wavelength reachability and wavelength occupation status information in real-time when cross-connection capabilities and constraints of the WDM device change.
  • wavelength reachability information may describe the reachability between all wavelengths of one TE link and that of the other TE links on the same device.
  • FIG. 1 illustrates an example of a WDM device (100), with cross-connection capabilities and cross-connection constraints among a plurality of TE links.
  • WDM device (100) has four Fiber Interface Unit (FIU) boards (110), (120), (130) and (140), connected to fibers located in four directions.
  • WDM device (100) has two upper/lower Optical Transponder Unit (OTU) boards (150) and (160), which are reachable to East and West, respectively, through internally connected fibers.
  • Each FIU is connected with one Wavelength Selective Switching Multiplexer (WSSM), and with one Wavelength Selective Switching Demultiplexer (WSSD); and the WSSD of one FIU is connected to WSSMs of the other three FIUs.
  • WSSM Wavelength Selective Switching Multiplexer
  • WSSD Wavelength Selective Switching Demultiplexer
  • Each OTU is connected with one multiplexer (MUX) and one demultiplexer (DMUX).
  • MUX (155) is connected with WSSM (112);
  • DMUX (157) is connected with WSSD (111);
  • Signals traveling through a fiber come into or go out of WDM device (100) via a corresponding FIU.
  • An optical signal on a fiber in the East is sent to WSSD (111) after being received by FIU (110), and the optical signal may be routed to WSSM (122), WSSM (132) or WSSM (142), where it may be output via FIU (120), FIU (130) or FIU (HO), respectively.
  • the optical signal may be routed to DMUX (157) for demultiplexing, and output via OTU (150). Signals coming in through the West fiber may be processed similarly.
  • a signal may be received by FIU (130), sent to WSSD (131), and routed to WSSM (112), WSSM (122), WSSM (142) or DMUX (167), where the signal may be output via FIU (110), FIU (120), FIU (140) or OTU (160).
  • Signals from the South fiber may be input through FIU (120), sent to WSSD (121), routed to WSSM (112), (132) or (142), and sent out via corresponding FIU (110), (130) or (140).
  • Signals from the North fiber may be input through FIU (140), sent to WSSD (141), routed to WSSM (112), (122) or (132), and sent out via FIU (110), (120) or (130).
  • OTU (150) may convert wavelength of an input signal, and pass the input signal to MUX (155) for multiplexing.
  • the multiplexed signal may be sent to WSSM (112) to be output via FIU (110).
  • OTU (160) may convert wavelength of an input signal and pass the input signal to MUX (165) for multiplexing.
  • the multiplexed signal may be sent to WSSM (132) as output via FIU (130).
  • each fiber transmits 40 waves, each having a wavelength ⁇ l
  • FIG. 1 depicts an illustrative example. In practical applications, multiple diverse cross-connection constraints may exist in a WDM device - such as what is illustrated in FIG. 1, where fibers in the four directions may not necessarily be all cross-connected, and wavelength converted through an OTU board may not necessarily go in only one direction. All such cross-connection constraints or cross-connection capabilities are comprehended by the present invention.
  • FIG. 1 illustrates six TE links generated from nodes of WDM device (100), named TELl - TEL6.
  • TELl may reach TEL2, TEL3 and TEL4 at wavelength ⁇ l - ⁇ 40, and may reach TEL5 at only wavelength ⁇ l. However, TELl may not reach TEL6.
  • TEL2 may reach TELl, TEL3, and TEL4 at wavelength ⁇ l - ⁇ 40.
  • wavelength reachability information for each TE link may be determined, as shown in Table 1 to Table 6.
  • the wavelength reachability information depicted above may be stored locally in an appropriate data structure, and reported to a routing sub-system for resource distribution.
  • Wavelength occupation status information describes whether wavelength resources of TE links are free, or occupied by a certain service. In the beginning, all wavelength resources are free. Wavelength occupation status changes as services are established and deleted. For example, if, at a certain time, wavelength ⁇ l, ⁇ 2 and ⁇ 3 of TELl in Fig. 1 are occupied, and the other wavelengths are free, then wavelength occupation status information of TELl may be described as shown in Table 7.
  • whether a wavelength is free or occupied may be represented by 0 and 1 , respectively.
  • Wavelength reachability information is relatively fixed — that is, once board configuration is made, and internal optical fiber connections are determined for a WDM device, wavelength reachability generally does not change. Wavelength reachability information may be updated in operation, when boards are added or removed, or when internal fiber connections are changed. That is, wavelength reachability information may be updated when optical network resources change.
  • Wavelength occupation status varies as services are established or deleted, and thus it may change relatively more often. Abstraction and distribution of resource occupation status information are a necessary part in an optical device, even in a fully cross-connected device, such as an SDH device.
  • wavelength reachability and wavelength occupation status information may be distributed to all nodes, or to a Path Calculation Equipment (PCE), of a network, through an OSPF protocol or similar routing protocols; such that each node or PCE in the network has knowledge of wavelength reachability information and wavelength occupation status information of all nodes, for correct routing calculations.
  • PCE Path Calculation Equipment
  • OSPF protocol is used as a routing protocol
  • wavelength reachability and wavelength occupation status information may be distributed via Link-State Advertisement type 10 (LSAlO) (i.e. TE LSA) of OSPF.
  • LSAlO Link-State Advertisement type 10
  • a linkJLV in LSAlO of OSPF describes details of all TE links that are related to one node.
  • a TLV contains multiple sub_TLVs, such as link type sub_TLV, link ID sub JTLV, etc.
  • link reachability sub_TLV may contain wavelength reachability information of all TE links related to one TE link of a node, including number of reachable TE links, index of each reachable TE link, and reachable wavelengths.
  • the sub_TLV may have a format of:
  • S a master/backup flag of a TE link; 0 represents master and 1 backup.
  • reachable_lml-_ num number of TE links reachable by a TE link.
  • linkl_if_index index of the first reachable TE link of a TE link.
  • reachable_larnbda_num number of reachable wavelengths of a TE link.
  • Lambdar ⁇ _value value of the n th wavelength that is reachable by a TE link.
  • one embodiment is to provide a BandWidth_TLV.
  • the BandWidthJTLV describes bandwidth and other related information of a corresponding TE link.
  • a subJTLV may be added in the BandWidth_TLV to describe wavelength occupation status information of a corresponding TE link, which is named Lambda status sub TLV.
  • the Lambda status sub TLV has a format of:
  • lambda_number number of wavelengths of a TE link.
  • Lambdar ⁇ _yalue value of wavelength ⁇ n of a TE link.
  • Lambdan_status occupation status of wavelength ⁇ n of a TE link. One bit may be used to represent whether a status is free or occupied. In real implementations, each bit of the four bytes for Lambdan_status may be used to represent a designated status.
  • OSPF protocol may be used to distribute cross-connection capabilities of each node to every other node, or to a PCE, within a network, by way of wavelength reachability and wavelength occupation status information. Wavelength reachability information and wavelength occupation status information may be provided in lmk_TLV and BandWidth_TLV, respectively, encapsulated in separate LSAlO, and distributed separately. Thereby network workload is reduced and network efficiency improved. Service paths in a WDM network may be calculated using wavelength reachability information and wavelength occupation status information.
  • An embodiment of the present invention is applicable not only to wavelength reachability distribution of TE links, but also to sub-wavelength reachability distribution. Cross-connection constraints exist in sub-wavelength service dispatching, which are also comprehended by the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un système permettant de communiquer des informations de connexion transversale dans un réseau optique à l'aide d'informations de longueur d'onde. Un procédé selon l'invention consiste : à analyser des informations de connexion transversale contenues dans des dispositifs de multiplexage par répartition en longueur d'onde (MRL), afin d'obtenir des informations d'accessibilité de longueur d'onde et des informations d'état d'occupation de longueur d'onde pour chaque noeud compris dans le réseau optique; et à distribuer les informations de connexion transversale d'un noeud à tous les autres noeuds ou à un matériel de calcul de trajet (PCE), par l'intermédiaire de protocoles de routage étendus, à partir de quoi l'on peut calculer des trajets de services.
PCT/CN2007/000893 2006-07-19 2007-03-20 Système faisant appel à des informations d'accessibilité de longueur d'onde et d'état d'occupation de longueur d'onde pour décrire des capacités de connexion transversale dans des réseaux optiques Ceased WO2008011770A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200610099398.4 2006-07-19
CN200610099398.4A CN1878047A (zh) 2006-07-19 2006-07-19 扩散波分设备的交叉限制信息的方法
US11/622,115 US7899326B2 (en) 2006-07-19 2007-01-11 System for utilizing wavelength reachability and wavelength occupation status information to describe cross-connection capabilities in optical networks
US11/622,115 2007-01-11

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WO2008011770A1 true WO2008011770A1 (fr) 2008-01-31

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Cited By (4)

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US20090142056A1 (en) * 2007-09-21 2009-06-04 Futurewei Technologies, Inc. Extending Routing Protocols to Accommodate Wavelength Switched Optical Networks
US8133745B2 (en) 2007-10-17 2012-03-13 Magic Technologies, Inc. Method of magnetic tunneling layer processes for spin-transfer torque MRAM
US8290366B2 (en) 2007-09-21 2012-10-16 Futurewei Technologies, Inc. Extending path computation element protocol to accommodate routing and wavelength assignment in wavelength switched optical networks
US20150155965A1 (en) * 2007-05-30 2015-06-04 Futurewei Technologies, Inc. System and Method for Wavelength Conversion and Switching

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Cited By (8)

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US20150155965A1 (en) * 2007-05-30 2015-06-04 Futurewei Technologies, Inc. System and Method for Wavelength Conversion and Switching
US9571223B2 (en) * 2007-05-30 2017-02-14 Futurewei Technologies, Inc. System and method for wavelength conversion and switching
US10341747B2 (en) 2007-05-30 2019-07-02 Futurewei Technologies, Inc. System and method for wavelength conversion and switching
US20090142056A1 (en) * 2007-09-21 2009-06-04 Futurewei Technologies, Inc. Extending Routing Protocols to Accommodate Wavelength Switched Optical Networks
US8290366B2 (en) 2007-09-21 2012-10-16 Futurewei Technologies, Inc. Extending path computation element protocol to accommodate routing and wavelength assignment in wavelength switched optical networks
US8655173B2 (en) * 2007-09-21 2014-02-18 Futurewei Technologies, Inc. Extending routing protocols to accommodate wavelength switched optical networks
US9231726B2 (en) 2007-09-21 2016-01-05 Futurewei Technologies, Inc. Extending path computation element protocol to accommodate routing and wavelength assignment in wavelength switched optical networks
US8133745B2 (en) 2007-10-17 2012-03-13 Magic Technologies, Inc. Method of magnetic tunneling layer processes for spin-transfer torque MRAM

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