TDM/WDM-PON Models into INET Framework Kyeong Soo (Joseph) Kim, - - PowerPoint PPT Presentation

Integration of OMNeT++ Hybrid TDM/WDM-PON Models into INET Framework

Kyeong Soo (Joseph) Kim, Ph.D. Senior Lecturer in Networking Multidisciplinary Nanotechnology Centre College of Engineering Swansea University 21 March 2011

Virtual NGOA Test Bed

1 1.25 Gb/s GPON test bed Linux HPC cluster with 22 nodes

Motivation

• To develop a comparative analysis framework

and supporting environment (virtual test bed) for next-generation optical access (NGOA) architectures based on user-perceived performances

– Measuring end-to-end, user-level experience of performance (i.e., QoE) – Traffic generation based on user behaviour models

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Scheduler

Downstream Traffic Queues

. . .

1:M Passive Splitter Upstream Traffic Queues

. . .

Burst-Mode Receiver

MAC

Downstream Traffic Queue Upstream Traffic Queue Modulator (SOA)

Hybrid TDM/WDM-PON OLT Hybrid TDM/WDM-PON ONU

1:N AWG

. . . . . .

Circulator Tunable Transmitter Tunable Transmitter Tunable Receiver Tunable Receiver Circulator

. . . . . .

Hybrid TDM/- WDM-PON

1:2 Passive Splitter

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INET Integration

• Switching at OLT and ONU
• Optical layer modelling
• ONU Discovery
• Control Frames

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Switching at OLT and ONU - 1

• Mapping between Ethernet and PON addresses

– PON address in hybrid PON: WDM channel index

• Based on point-to-point model of underlying PON

– No support of broadcasting/multicasting at the PON level

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PON as a point-to-point network

PON (= OLT + ODN + ONUs) … …

… …

UNI SNI

…

…

Switching at OLT and ONU – 2

• Layered diagram of hybrid TDM/WDM-PON

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Ethernet Switch (Bridge) PON Layer (Scheduler@OLT) Optical (WDM) Layer

ODN

Ethernet Switch (Bridge) PON Layer (MAC@ONU) Optical (WDM) Layer

1-to-1 mapping between ports and ONUs (i.e., WDM channels)

OLT ONU

Optical Layer Modelling – Transmission and Reception

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TX start (t1) TX end OLT RN (AWG) ONU

Processing starts as soon as the 1st bit is received RX event in normal mode Beginning of Grant

RX event in normal mode (t2)

TX starts as soon as the 1st bit is received We need “flow-through” reception mode here!

RTT

Hierarchical Model Construction

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Application Host

(e.g., PC)

ONU

(w/ Ethernet Switch)

Service User Subscriber

(Household)

Overview of Host (User) Node

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HTTP 1

TCP UDP Network and Lower Layers

HTTP nh

…

FTP 1 FTP nf

…

Video 1 Video nv

…

UNI

Implemented Modules

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Streaming Video Traffic Model

• Based on H.264/AVC video traces

– e.g. “Terminator 2” VBR clip from ASU Video Trace Library

• Duration: ~10 min
• Frame Size: HD 1280x720p
• Mean frame bit rate: 28.6 Mbit/s
• Interface with OMNeT++/INET through

“UDPVideoStream{Svr,Cli}WithTrace” modules:

– Performance metrics:

• Decodable frame rate (perceived quality metric)
• Packet end-to-end delay (vector)
• Packet loss rate
• Frame loss rate

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For More Information

• INET-HNRL

– http://kyeongsoo.github.com/inet-hnrl/

• Virtual Test Bed for Next-Generation Optical Access

– http://iat- hnrl.swan.ac.uk/projects/virtual_ngoa_testbed.html

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