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Research Activities on Optical Burst Switching at OIRC. Jun Kyun Choi, Minho Kang Optical Internet Research Center Information and Communications University, Korea {jkchoi, mhkang}@ icu.ac.kr. Outline. Introduction to OIRC OBS Research Activities Issues on GMPLS Control Plane for AOBS

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research activities on optical burst switching at oirc

Research Activities on Optical Burst Switching at OIRC

Jun Kyun Choi, Minho Kang

Optical Internet Research Center

Information and Communications University, Korea

{jkchoi, mhkang}@icu.ac.kr

outline
Outline
  • Introduction to OIRC
  • OBS Research Activities
  • Issues on GMPLS Control Plane for AOBS
  • Conclusion

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

introduction to oirc
Introduction to OIRC

History of OIRC

Objectives of OIRC

Technology Leader

lead

research and develop competitive technology

in Optical Internet

Society Promoter

Industry Creator

create new industry by combining

Optical and network technologies

promote

knowledge-driven society

over Optical Internet

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

organization of oirc
Organization of OIRC

Director

(Minho Kang)

  • Investigators
  • Research Areas

- Optical Internet architecture

- Optical Internet traffic engineering

- Optical Internet testbed

  • Participants

ICU, Soongsil U., Daejeon U., ETRI, KT, Samsung, Haedong, NetsFeel, Nortel Networks (Canada), VPI(Germany), CUBIN (AUS)

Network Group

(Hongshik Park)

Protocol Group

(Jun Kyun Choi)

System Group

(Yong Hyub Won)

  • Investigators
  • Research Areas

- Optical burst-mode tranceiver

- Optical packet header processing

- Optical buffering and switching control

  • Participants

ICU, Korea U., Catholic Univ.,

ETRI, Samsung,

Roswin, Zenphotonics, ITEC technology,

Lightron, Teradian, Phoco

  • Investigators
  • Research Areas
  • - Optical routing protocol
  • - Optical signaling and control
  • - Optical burst switch control
  • Participants
  • ICU, Chonbuk U., Andong U.,
  • ETRI, KT, Samsung,
  • Wareplus, Telion, Horim

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

collaboration of oirc
Collaboration of OIRC
  • Collaborative Research
  • Research Environment
  • Exchange Researcher
  • Overseas Laboratories
  • Internship program
  • Collaborative Research

AP-CRC, CUBIN

Nortel, VPI

Joint Development

Domestic

Industries

Universities

OIRC

  • KT, Samsung,
  • Haedong, NetsFeel, Telion,
  • ZenPhotonics, Lightron, Knowledge*on, Teradian, Phoco

Cooperative Research

Establishment and Funds

Research

Institutes

Government

  • KOSEF, MOST, MIC
  • ETRI, KT, Samsung

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

outline1
Outline
  • Introduction to OIRC
  • OBS Research Activities
  • Issues on GMPLS Control Plane for AOBS
  • Conclusion

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

research focus of oirc
Research Focus of OIRC

R : Research

D : Development

C : Commercial

Focusing Area

Optical

Packet

Switching

D

R

Intelligent

Electro-Optical

Label Switching

Optical Label/

Packet Processing

Optical

PacketSwitching

Technology

Optical

Burst

Switching

R

D

C

Technology Evolution of Optical Internet

GMPLS+AOBS

GMPLS+Optical Access

MPS+OBS

Optical

Circuit Switching

Technology

Dynamic

WDM

OXC

D

C

R

Dynamic OXC

D

C

Static WDM

OXC

Static OXC

-6 year

(1997)

-3 year

(2000)

Present

(2003)

3 year

(2006)

6 year

(2009)

(note) GMPLS: Generalized Multi-Protocol Label Switching, OBS: Optical Burst Switching, AOBS: All Optical Burst Switching

OXC: Optical Cross-Connect, WDM: Wavelength Division Multiplexing

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

current technical issues related to obs
Current Technical Issues Related to OBS

Characteristics of OBS

  • Exchange unit :Variable length – burst
  • A burst cut through intermediate node without being buffered
  • Data burst and control packet are transmitted on separate channels
  • Control packet may reserve duration for transparent optical data burst

to be switched

  • Bandwidth for a burst is reserved in one-way process

Some Questions for OBS implementation

  • How to configure the entire optical Internet architecture ?
  • How to classify the data burst to provide QoS ?
  • What is the mechanism to decide the routing path ?
  • How to manage whole core and edge nodes efficiently ?
  • How to make OBS module for implementing in real network environment ?

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

focusing area of oirc 2003 2005
Focusing Area of OIRC (2003 – 2005)

Research on GMPLS based AOBS core technology

  • GMPLS-based AOBS network architecture and
  • traffic engineering
    • Protection/Restoration
  • GMPLS signaling and control protocol for AOBS
  • AOBS system technologies
    • Optical interface, optical packet header processing,
    • buffering, filtering and switching

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

demonstration of optical internet testbed 2002

LER

Application

LER

OBS

IP

OBS Networks

IP Networks

Output / Egress

Input (source) / Ingress

Demonstration of Optical Internet Testbed (2002)

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

outline2
Outline
  • Introduction to OIRC
  • OBS Research Activities
  • Issues on GMPLS Control Plane for AOBS
  • Conclusion

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

gmpls control plane for obs

GMPLS extends the MPLS-TEsignaling protocols such as RSVP-TEandCR-LDP

  • GMPLS also extends traditional intra-domain link-state routing protocols

already extended for TE purposes, i.e. OSPF-TE and IS-IS-TE

  • LMP basic functions are control channel management, link connectivity verification,

link property correlation, fault isolation

  • Control packet contains not only traditional information to control data burst

but also label information related with GMPLS for finding, making and recovering LSP

  • Moreover, thisLSP is a bidirectional transmission path formed by signaling protocol

and routing protocol

Why OBS employs GMPLS as a control plane?

  • Supervision of the whole processes in edge and core nodes may be carried out

using GMPLS control plane.

  • A concrete format and functions of control packet in OBS are not defined yet

and GMPLS header may include suitable attributes related to OBS

  • By establishing LSP, we can make an explicitly routed path and relieve a burden

of control packet processing

  • Can also provide traffic engineering functions of GMPLS
GMPLS Control Plane for OBS

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

a core node architecture using gmpls control plane for obs
A Core Node Architecture using GMPLS control plane for OBS

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

an edge node architecture for gmpls over obs

RCP

OPM

GMPLS

Control Module

FT

SCP

IPS : Ingress Packet Switch

LIB : Label Information Base

FT : Fixed Transmitter

OPM : Output Packet Module

FEC : Forward Equivalence Class

RCP : Routing Control Packet

SCP : Signaling Control Packet

BCP : Burst Control Packet

LIB

label

BCP

BCP generation

Scheduler

OPM

First packet arrival

EVENT for a burst

- burst length

- offset

wavelength

ID selection

FT

0

1

IP traffic

Source 1

IPS

Assembler

E/O

2

class 1

CCG

class 2

M

U

X

Fiber

FT

DCG

K-1

To Egress 1

FEC

Source S

To Egress N-1

An Edge Node Architecture for GMPLS over OBS

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

gmpls based optical ip network architecture

IP/MPLS Router

IP/MPLS Router

Optical Edge Router

Optical Edge Router

GMPLS-based Optical IP Network Architecture

Customer

Network

IP/MPLS Network

Customer Network

IP/MPLS Router

Optical MPS

Sub-Network

Optical Edge Router

Optical Core Router

Performs label merging/tunneling

to optical lambda LSPs.

Perform Explicit Routing on lightpath LSPs with optical switching fabrics

LSPs within Electronic

MPLS Clouds

Note) LSP: Label Switched Path

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

ip over optical service models domain service model

IP/MPLS Router

IP/MPLS Router

IP over Optical Service ModelsDomain Service Model

Server-Domain

Optical Sub-network

Control & Management Plane

Client-Domain

IP Network

Client-Domain

IP Network

NNI

Optical Node

Controller

NNI

NNI

UNI

UNI

(GMPLS signaling is

not shown at Client)

Signaling exchange

Optical Edge Router

Optical Core Router

Loose Binding

in Optical Path

Data

Transfer

Optical Path

User Plane

Optical Node

Optical Node

Optical Node

Note) UNI: User to Network Interface NNI: Network to Network Interface

MPLS: Multi-Protocol Label Switching GMPLS: Generalized MPLS

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

ip over optical service models unified service model

IP/MPLS Router

IP/MPLS Router

IP over Optical Service ModelsUnified Service Model

Optical Sub-network for Control Plane

Control & Management Plane

IP/MPLS Network

IP/MPLS Network

NNI

UNI

Optical Node

Controller

NNI

NNI

UNI

Common Signaling

based on GMPLS

Optical Edge Router

Optical Core Router

Tight Binding

in Optical LSP

Optical LSP

User Plane

Data

Transfer

with label information

Optical Node

Optical Node

Optical Node

Note) UNI: User to Network Interface

NNI: Network to Network Interface

MPLS: Multi-Protocol Label Switching

GMPLS: Generalized MPLS

LSP: Label Switched Path

Optical Sub-network

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

aobs gmpls architectural aspects
AOBS+GMPLS Architectural Aspects
  • Evolution or Migration of Existing Optical Network
  • Evolution of Optical Access/Metro Network ?
    • PON-based, RPR-based, or Optical Ethernet ?
  • Cost and Benefit of Optical Packet Technology ?
    • Feasibility of Optical Burst/Packet Technology technically and economically
    • Optical level interleaving is acceptable ?
    • How to handle short IP Packets ?
  • Evolution of GMPLS-based Optical Network
    • Successful Replacement of SONET/SDH ?

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

justification of aobs gmpls
Justification of AOBS+GMPLS
  • What is the real target for AOBS+GMPLS
    • Technical Feasibility of Optical Burst Technology
      • Performance Aspects
      • Channel Efficiency Aspects
      • Control and Signaling Aspects
      • Implementation Complexity and Cost aspects (transmission and switching)
    • Reviews with GMPLS signaling for OBS
      • Two different approaches on IP-based and Packet-based !
      • In-band or Out-of-band signaling ?
    • Review of Market adaptability for Network Deployment
      • replace or upgrade the existing Terabit Router and newly construct the OBS network ?

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

justification of aobs gmpls1
Justification of AOBS+GMPLS
  • What is the urgent technology for AOBS+GMPLS to be solved
    • Optical Burst Transmission and Switching Technology
    • Cost reduction of optical components (tuners, buffer, switch)
    • Protection and Restoration for OBS
    • Optical burst transmission and switching technology
    • OBS switch control
    • GMPLS protocol for OBS
    • Open Control and Management for OBS
    • PON-based OBS or OBS-MAC

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

feasibility of aobs technology
Feasibility of AOBS Technology
  • Trade-off between Optical Burst Processing and Channel Efficiency
    • In view of technology
  • Is there any other alternatives ?
    • Fast Circuit Switching with powerful processing module
    • Real Optical ALOHA or Optical CSMA ?

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

critical r d issues
Critical R&D Issues
  • Focus on Optical Channel Efficiency
    • Optical Traffic Engineering
      • Both way for open loop control and closed loop control
      • GMPLS signaling, multiplexing scheme, scheduled buffering, resource notification, dynamic re-arrangement of optical resources)
    • Combine Wavelength Assignment/Converter with AOBS switch architecture

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

qos aspects on aobs gmpls 1
QoS Aspects on AOBS+GMPLS - 1
  • It is necessary to support differentiated services for
    • QoS guaranteed multi-media applications
    • Control information (Signaling, Routing, OAM), Protection/restoration which require higher priority than other ordinary traffic
  • QoS performance metrics
    • Burst loss probability, Delay, Jitter, Offset time difference
  • Is IP QoS mechanism (Intserv & Diffserv) enough for OBS ?
    • Mandate the use of buffer
    • Intserv: Scalability problem
    • Diffserv: Relative QoS mechanism cannot guarantee a mission critical traffics

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

qos aspects on aobs gmpls 2
QoS Aspects on AOBS+GMPLS - 2
  • QoS supporting schemes for OBS
    • Offset time-based scheme
    • Deflection routing scheme
    • Burst segmentation scheme
    • BCP scheduling scheme
      • Proportional service rate
      • Preemption
      • WFQ
    • Forward resource reservation scheme
    • Early Burst Drop
    • Dynamic wavelength assignment scheme

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

qos aspects on aobs gmpls 3
QoS Aspects on AOBS+GMPLS - 3
  • GMPLS based Absolute QoS Architecture
    • Goal: Guarantee a strict upper bound of performance
      • Diverse QoS requirements
      • Network level security
      • Busty IP traffic (QoS degradation during short period)
    • Dynamic wavelength assignment + Feedback control
    • No admission control
    • Combine proactive GMPLS control and feedback control

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

traffic engineering on aobs gmpls
Traffic Engineering on AOBS+GMPLS
  • Is MPLS-TE operable in OBS networks?
  • Considerations
    • TE unit
      • Burst?
      • Necessity to introduce “trunk” concept?
    • Connection-Oriented Routing: delivery of link state information
    • QoS Guaranteeing
      • Policing
      • Admission control
      • Feedback control

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

direction for aobs gmpls
Direction for AOBS+GMPLS

1. Advanced OBS: Traffic Engineering, QoS supporting, Contention resolution, Protection

Scale

Access OBS

2. Acceptable OBS: GMPLS extension, UNI interface with existing network, Testbed Standardization

Access

AOBS:

Converge 3 different OBS views

Metro

3. Access OBS: OBS PON, Ethernet over OBS Metro ring OBS…

Original OBS

Advanced OBS

Backbone

None

TechnologicalAdvance

Low

Medium

High

Limited

Full

Acceptable OBS

PracticalImplementation

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea

conclusion

Thanks

  • We appreciate the graceful support of KOSEF, ETRI, and Samsung on this work

through ERC Project

Conclusion
  • Introducd OIRC
  • AOBS+GMPLS Research Activities
  • - Researching theoretical base and implementing it in real circumstance
  • Proposed a GMPLS Control Plane for AOBS

- An interim solution toward the ultimate optical packet Internet implementation

- suppors QoS, supervision of the whole processes, and Traffic Engineering

Globecom’03 Workshop W-2

Jun Kyun Choi, Korea