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WO2003067919A1 - Selection de longueur d'onde pour la transmission par paquets au moyen d'un reseau optique passif - Google Patents

Selection de longueur d'onde pour la transmission par paquets au moyen d'un reseau optique passif Download PDF

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Publication number
WO2003067919A1
WO2003067919A1 PCT/IB2003/000352 IB0300352W WO03067919A1 WO 2003067919 A1 WO2003067919 A1 WO 2003067919A1 IB 0300352 W IB0300352 W IB 0300352W WO 03067919 A1 WO03067919 A1 WO 03067919A1
Authority
WO
WIPO (PCT)
Prior art keywords
packet
optical
traffic quality
optical network
header
Prior art date
Application number
PCT/IB2003/000352
Other languages
English (en)
Inventor
Wilfred A. M. Snijders
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to AU2003205949A priority Critical patent/AU2003205949A1/en
Publication of WO2003067919A1 publication Critical patent/WO2003067919A1/fr

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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
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0066—Provisions for optical burst or packet networks
    • 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
    • H04Q2011/0069—Network aspects using dedicated optical channels
    • 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
    • H04Q2011/0084—Quality of service aspects

Definitions

  • the invention relates generally to passive optical networks (PONs), and more particularly to transmitting IP packets over Ethernet PONs.
  • PONs passive optical networks
  • Point-to multipoint networks may take on various configurations including a tree configuration, a star configuration, a bus configuration, and a ring configuration. They may also use any type of communication protocol, including time division multiple access protocols (TDMA), code division multiple access protocols, Internet protocols, contention protocols, etc.
  • TDMA time division multiple access protocols
  • APON ATM passive optical network
  • EPON Ethernet-PON
  • IP Internet protocol
  • This class of broadband network architectures combines the best elements of fiber optics and Ethernet technologies and builds on the widely available Ethernet platforms for data networks.
  • EPONs build on the physical layer specification of the ITU recommendation for APONs (ITU-T G983.1).
  • ITU-T G983.1 the physical layer specification of the ITU recommendation for APONs
  • Ethemet-PONs employ the standard fast-Ethernet and Gigabit-Ethernet technologies that are normally associated with business Local Area Networks (LAN).
  • Ethemet-PONs use gigabit-Ethernet technology on a passive optical network to connect the source node (or head end) to a "curb node" (local router), and fast-Ethernet technology over UTP for the "last mile" from the curb node to the home.
  • the curb node holds the data in both the gigabit-Ethernet-PON and the fast-Ethernet- UTP electronic formats.
  • a known problem with PONs is how to provide adequate Quality-of-service (QoS) for real-time video and audio services.
  • packet-based networks such as TCP/IP (Transmission Control Protocol/Internet Protocol)
  • quality of service signaling protocols available, such as RSVP (Resource ReSerVation Protocol) and DiffServ (Differentiated Services).
  • RSVP Resource ReSerVation Protocol
  • DiffServ Differentiated Services
  • It is an object of the invention provide adequate quality of service for packet- based transmission over a passive optical network so as to separate time-critical information from non-time critical information in the transmission path.
  • a method for transmitting a plurality of packets with different traffic quality categories in an Ethernet-passive optical network is disclosed.
  • the traffic quality category for the packet is determined from a field in a header of the packet.
  • An optical wavelength for transmission of the packet is then selected based on the determined traffic quality category and the packet is transmitted using the selected optical wavelength.
  • a passive optical network for transmitting packets is disclosed.
  • the passive optical network comprises at least one optical distribution node, with at least one transmitter, and at least one receiving node, with at least one receiver.
  • the distribution node and receiving node are connected via an optical transmission line.
  • the transmitter transmits a packet over the optical transmission line using one of a plurality of different optical wavelengths, wherein the optical wavelength for the packet is determined by a traffic quality category which is indicated by a field in header information of the packet to be transmitted.
  • a header for a packet which is transmitted over a passive optical network comprises a field for indicating a traffic quality category for the packet, whereby the passive optical network can transmit the packet using one of a plurality of different optical wavelengths as specified for the traffic quality category indicated by the field.
  • Fig. 1 is a block diagram of an Ethernet-passive optical network
  • Fig. 2 is a block diagram of an IP header of an IP packet
  • Fig. 3 is a block diagram of a type of service field in an IP header
  • Fig. 4 is a block diagram illustrating an optical distribution node and a curb node of a passive optical network
  • Fig. 5 is a flow chart illustrating the steps for transmitting an IP packet in the
  • Ethernet-passive optical network Ethernet-passive optical network
  • Fig. 1 illustrates an Ethernet-passive optical network 100 which can be used with the different embodiments of the invention.
  • the EPON 100 is comprised of an optical distribution node 102 and a curb node 106. It will be understood that the EPON 100 can have a plurality of optical distribution nodes and a plurality of curb nodes connected to each optical distribution node, but that for the sake of simplicity of explanation, Fig. 1 only illustrates one optical distribution node and one curb node.
  • the optical distribution node 102 and the curb node 106 are connected via links 110 and 112.
  • the links are gigabit Ethernet links but the invention is not limited thereto.
  • the optical distribution node 102 comprises, among other features, at least one optical termination unit (OLT), a memory structure 105 and processing means 107.
  • the OLT is connected to the "head end" of the passive optical network and controls access to the shared capacity of the PON and interconnects the PON with a wider telecommunications network.
  • An optical network unit (ONT) 108 is provided in the curb node 106 and is connected to the OLT 104 in the optical distribution node 102.
  • the distance between the OLT 104 and the ONT 108 is typically between 10-20 km with split factors of 1:32 or 1:64.
  • a plurality of homes (end-users) 118, 122, 124 are connected to the curb node 106 via high quality twisted pair cabling 114, for example UTP category 5, using 100 base T technology 116,120 with a length of up to 500 meters.
  • each PON carries 1 Gbit/s in both directions using IP multicasting and single-casting on standard optical Gigabit-Ethernet equipment. If necessary for capacity reasons, multiple gigabit-Ethernet streams (links) can be combined on particular bandwidth hungry curb nodes using wavelength multiplexing.
  • Data such as voice, video or audio signals is transmitted over the PON 100 between an ONT 108 and an OLT 104 according to a predetermined packet structure, data being multiplexed within that predetermined structure for the particular service being provided to the end-users 118, 122, 124.
  • Data exchanges between the OLT 104 and the ONT 108 take place under the centralized control of the OLT 104 using a predetermined protocol, designed to ensure that the available capacity of the PON is shared equitably between the connected ONTs and between the various services being carried.
  • Data being transmitted upstream over the PON 100 from the ONT 108 to the OLT 104 is typically transported using TDM technology similar to the technique used in APONs.
  • the time slots are synchronized and managed via the access protocol so that upstream packets of the different ONTs do not interfere when optically combined in a splitter (not illustrated in Fig. 1) of the PON.
  • a splitter not illustrated in Fig. 1
  • fixed time slots are allocated to ONTs, but more elaborate access methods are possible.
  • Upstream transmission is slightly less efficient than downstream transmission due to the presence of guard bands to cope with small inaccuracies in upstream timing between the ONTs.
  • Data can be transmitted downstream from the OLT 104 to the ONT 108 in variable length packets of up to 1518 bytes according to the IEEE802.3 protocol.
  • Each packet carries a header that identifies for which ONT (single-cast) or group of ONTs (multicast) the data is intended for.
  • the ONTs accept the packets with the correct address and discard the packets that are intended for other ONTs.
  • the ONT 108 routes the packets to and from the dedicated fast-Ethernet links over the UTP cabling 114 to the end-users 118, 122, 124.
  • Whether the ONT 108 is a level-2 or level-3 router depends on the type of services that the system delivers to the end-user. For mere data services a level-2 router suffices that simply routes the packets on the basis of the Media Access Control (MAC) addresses.
  • MAC Media Access Control
  • video In Ethernet based networks, video is transported as MPEG encoded data encapsulated in IP packets. The video broadcast function from cable networks and terrestrial broadcast stations is replaced by IP multicasting of video channels.
  • IP encapsulated multicast channels for video are available over the PON in the downstream direction which uses about 500 Mbit/s. Because of the limited capacity of the subscriber drops, all of these video channels cannot be sent the end-users.
  • An end-user that wants to select a particular video channel joins an EP multicast group, wherein the video data is multicast to the end-users ONT.
  • the ONT then routes the appropriate IP packet to the end-user. Since it is possible that more than one end-user connect to the ONT wants to receive the same video channel, the ONT should be able to multiplicate IP packets. This requires a level-3 ONT in the curb node.
  • Fig. 2 illustrates an IP header 200.
  • IP headers are well known in the art and all of the various fields in the header will not be described herein. The reader is referred to Internet Standards RFC 791, 1349, 2474 for details.
  • the IP header 200 has an 8 bit type of service (ToS) field 202 which is illustrated in Fig. 3. The first 3 bits of the ToS field 202 are a precedence field which is typically ignored.
  • ToS 8 bit type of service
  • the next 4 bits have been used to implement the differentiated services (DiffServ) method for prioritization of traffic, wherein the bits indicate 8 levels of prioritization of traffic.
  • the ToS bits are set by application type and are used in making routing decision as an IP packet is routed across routers in the PON.
  • the ToS field is used to not only indicate to the routers in the PON the priority level of the packet but also the optical wavelength at which the IP packet should be transmitted.
  • the 3 bit precedence field can be used to designate up to 8 different traffic quality levels or the 4 bits used by the DiffServ method can be used.
  • the ToS field can be used to specify different groups of traffic quality categories, wherein each group of traffic quality categories are transmitted using the same optical wavelength.
  • the OLTs 404 and the ONTs 408 of the EPON 400 are equipped with "transmitters" 410, 412 which can transmit IP packets using different optical wavelengths as illustrated in Fig. 4.
  • U.S. Patent 4,977,593 discloses several possible methods and devices for achieving optical wavelength multiplexing in a passive optical network. For example, Fabry-Perot lasers, single longitudinal mode lasers and advanced coherent optical sources with combinations of optical filters and electrical techniques can be used to create and select different optical wavelengths for transmitting data. It will be understood that the invention is not limited these methods and devices for providing optical wavelength multiplexing in the EPON 400.
  • the OLTs 404 and ONTs 408 also have receiving devices 414, 416 for receiving the EP packets transmitted with different optical wavelengths. Furthermore, the OLTs 404 and ONTs 408 also have the appropriate processing means 418, 420 for reading the EP header of each EP packet and determining the indicated traffic quality category for the EP packet. It will be understood that the processing means 418, 420 can also be part of the processing means of the optical distribution node and the curb node, respectively, and the invention is not limited thereto.
  • the OLTs 404 and the ONTs 408 also have means, such as a lookup table 422, 424, for determining the correct optical wavelength at which the EP packet should be transmitted at for the indicated traffic quality level.
  • an OLT 404 receives an EP packet for transmission over the EPON 400 in step 502
  • the OLT 404 analyzes the ToS field in the EP header of the EP packet to determine the indicated traffic quality category for the EP packet in step 504. Once the traffic quality category has been determined, the OLT 404 selects the appropriate optical wavelength for transmitting the EP packet from, for example, a lookup table in step 506. The OLT 404 then transmits the EP packet using the appropriate optical wavelength to the ONT 408 in step 508. The same method can also be used for transmitting EP packets from the ONT 408 to the OLT 404.
  • time-critical information is separated from non-time critical information in the transmission path thereby providing quality of service in an Ethernet-passive optical network.
  • peak loads of non-time critical information cannot block the flow of time-critical information through the network.
  • the above-described embodiments of the invention describe a method an apparatus for conveniently providing quality of service in an Ethernet passive optical network by using the ToS field in the EP header of an EP packet to indicate the traffic quality category of the EP packet and to transmit the EP packet using different optical wavelengths depending on the indicated traffic quality category.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un procédé et un appareil permettant la transmission d'une pluralité de paquets IP de différentes catégories de qualité de trafic dans un réseau optique passif Ethernet (100). Lorsqu'un paquet IP destiné à être transmis est reçu, la catégorie de qualité de trafic du paquet est déterminée à partir d'un champ dans un en-tête IP (200) du paquet. Une longueur d'onde optique de transmission du paquet IP est ensuite sélectionnée en fonction de la catégorie de qualité de trafic déterminée et le paquet IP est transmis à l'aide de la longueur d'onde sélectionnée.
PCT/IB2003/000352 2002-02-06 2003-02-03 Selection de longueur d'onde pour la transmission par paquets au moyen d'un reseau optique passif WO2003067919A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003205949A AU2003205949A1 (en) 2002-02-06 2003-02-03 Wavelength selective for packet transmission via a passive optical network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP02075497 2002-02-06
EP02075497.4 2002-02-06

Publications (1)

Publication Number Publication Date
WO2003067919A1 true WO2003067919A1 (fr) 2003-08-14

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PCT/IB2003/000352 WO2003067919A1 (fr) 2002-02-06 2003-02-03 Selection de longueur d'onde pour la transmission par paquets au moyen d'un reseau optique passif

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AU (1) AU2003205949A1 (fr)
WO (1) WO2003067919A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2101449A4 (fr) * 2006-12-15 2012-02-29 Fujitsu Ltd Système de communication optique, son procédé et périphérique de communication

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001086998A1 (fr) * 2000-05-11 2001-11-15 Btg International Limited Reseaux de transport optiques

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001086998A1 (fr) * 2000-05-11 2001-11-15 Btg International Limited Reseaux de transport optiques

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DUSER M ET AL: "Distributed router architecture for packet-routed optical networks", NEW TRENDS IN OPTICAL NETWORK DESIGN AND MODELING. IFIP TC6 FOURTH WORKING CONFERENCE ON OPTICAL NETWORK DESIGN AND MODELING, NEW TRENDS IN OPTICAL NETWORK DESIGN AND MODELING. IFIP TC6 FOURTH WORKING CONFERENCE ON OPTICAL NETWORK DESIGN AND MODELING, 2001, Dordrecht, Netherlands, Kluwer Academic Publishers, Netherlands, pages 187 - 202, XP002237902, ISBN: 0-7923-7355-3 *
GOLMIE N ET AL: "A DIFFERENTIAL OPTICAL SERVICES MODEL FOR WDM NETWORKS", IEEE COMMUNICATIONS MAGAZINE, IEEE SERVICE CENTER. PISCATAWAY, N.J, US, vol. 38, no. 2, February 2000 (2000-02-01), pages 68 - 73, XP000912316, ISSN: 0163-6804 *
JUKAN A ET AL: "SERVICE-SPECIFIC WAVELENGTH ALLOCATION IN QOS-ROUTED OPTICAL NETWORKS", IEEE GLOBECOM 1998. GLOBECOM '98. THE BRIDGE TO GLOBAL INTEGRATION. SYDNEY, NOV. 8 - 12, 1998, IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, NEW YORK, NY: IEEE, US, vol. 4, 8 November 1998 (1998-11-08), pages 2270 - 2275, XP000894444, ISBN: 0-7803-4985-7 *
NICHOLS K ET AL: "RFC 2474 - Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers", INTERNET ENGINEERING TASK FORCE, NETWORK WORKING GROUP, December 1998 (1998-12-01), XP002171920, Retrieved from the Internet <URL:http://www.ietf.org/rfc/rfc2474.txt> [retrieved on 20010712] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2101449A4 (fr) * 2006-12-15 2012-02-29 Fujitsu Ltd Système de communication optique, son procédé et périphérique de communication
US8200088B2 (en) 2006-12-15 2012-06-12 Fujitsu Limited Optical communication system, and optical communication method and communication unit therefor

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