Test-Bed for testing scenarios of new DTN architecture AsiaFI 2008 August, 2008 Multimedia and Mobile Communication Lab.

Test-Bed for testing Test-Bed for testing scenarios of new DTN scenarios of new DTN

architecturearchitectureAsiaFI 2008

August, 2008

Multimedia and Mobile Communication Lab.

Contents

Intelligent Emergency DTN ArchitectureRelated Test-Bed Projects

– TIER– EDIFY– Tetherless Computing– SPINDLE

Test-Bed for testing scenarios of new DTN architecture

– Objective– Current Plan– Architecture– Preliminary Experiments

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Intelligent Emergency DTN Intelligent Emergency DTN ArchitectureArchitecture

MotivationMotivation

Other studies– FIND: The-Day-After-Networks (UIUC)

• objective: to support survivals and to help disaster relief groups coordinate each other

• multi-interface gateway based– An Architectural Proposal for Future Wireless Emergency

Response Networks with Broadband Services (Bell Labs)• objective: the rapid and reliable establishment of high-speed

communication links between rescue crews and their headquarters, political institutions, military and police forces, and international organizations.

• optical backbone network, portable based station, mobile gateway

– Supporting Emergency-Response by Retasking Network Infrastructures (UIUC)

• objective: a network used by victims and rescuers to communicate among themselves

• to use networks for emergency communications if they were originally intended to provide a different service

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MotivationMotivation

Our Proposal– Objective: to supports communication

between survivals and to help S.O.S messages forwarded to rescuers

– dynamic survivals network configuration• intelligent emergency DTN backbone• active network, software defined radio (SDR)

– Why DTN?• integrating between heterogeneous networks• poor connectivity• distributed message storing• …

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SDR capable node

Normal node (cellular)

Normal node (WiFi) Tangshan, China earthquake, May, 12, 2008

ScenariosScenarios

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7WiFi ad-hoc network

(SDR incapable)

3G Device(SDR incapable)

Intelligent Emergency-DTN

DTN Node(3G Access Point,

SDR capable)DTN Node

(Ad hoc node, SDR capable)

DTN Node(Router, SDR capable, GPS)

3G Connection

Intelligent Emergency DTNIntelligent Emergency DTN

WiFi Connection

Link LayerLink Layer

PHY (Software Defined Radio)PHY (Software Defined Radio)

TransportTransport

ApplicationApplication

NetworkNetwork

Ma

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ge

me

nt M

od

ule

(Active

Ne

two

rk)M

an

ag

em

en

t Mo

du

le(A

ctive N

etw

ork)

Topology Control...

Topology Control...

Neighbor Discovery…

Neighbor Discovery…

ReliableTransport

…

ReliableTransport

…

Intelligent Emergency DTNIntelligent Emergency DTN

Scanning, &

Frequency Adaptation

Scanning, &

Frequency Adaptation

DTN BundleDTN Bundle

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Related Test-Bed ProjectsRelated Test-Bed Projects

Related Projects

Reference URL : DTNRG– http://www.dtnrg.org/wiki/Docs

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TIER

TIER : Technology and Infrastructure for Emerging Regions

– University of California at Berkeley– http://tier.cs.berkeley.edu/

Objective– the design and deployment of new technologies for

emerging regions

Project Areas– Wireless : WiFi-based Long Distance Networks (WiLDNet)

– TierStore : Distributed Storage System and Application Framework

– Education, Healthcare, Speech, Power

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EDIFY

EDIFY : Enhanced DIsruption & Fault Tolerant Bundle DeliverY

– Phase 1 Project Goals• Designing enhanced naming scheme that can cope with

network mobility and partitions• Designing DTN Unicast & Multicast Routing Schemes • QoS-Based Bundle Acceptance Algorithm• Ferry Scheduling Scheme• Prototyping DTN Bundle Security Protocol

– Phase 2 Project Goals• Design DTN Service Discovery Schemes • Design DTN Inter-group Unicast and Multicast Schemes • Information Assurance • Building and Experimenting with Test-Beds

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Tetherless Computing

Tetherless Computing– Smart mobile devices, such as cell phones and PDAs

opportunistically communicate with centralized server clusters over heterogeneously administered wireless networks

– Bus-and-Kiosk Network (KioskNet: Rural Internet in Developing Regions) Opportunistic Scheduling in Ferry-Based Networks

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SPINDLE

SPINDLE : Survivable Policy-Influenced Networking: Disruption-tolerance through Learning and Evolution

– Phase I: From Feb 2005 to Aug 2006• DTN technology providing 100% delivery ratio at 20% average

link availability with 80% link utilization– (Provide disruption-tolerant content-based access to information)

• Real Mobile Wireless setting– Wireless connectivity, GPS, Ethernet, modem, USB– SPINDLE system Based on DTNRG bundle layer

– Phase II: From Jul 2006 to Jan 2008• To achieve a transitionable and evolvable, long-lived capability

for Department of Defense– Innovative DTN technology development (~70 nodes) : Content-

based networking, routing, adaptive dissemination, late binding, and policy

– Vehicular DTN system prototype

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Test-Bed for testing scenarios Test-Bed for testing scenarios of new DTN architectureof new DTN architecture

Objective & Considerations

Objective– Building an Integrated Overlay Network of Heterogeneous

Networks based on DTN Architecture (DTNRG Bundle Protocol)– Measuring & Improving the Performance of DTN

Architecture for the Unification of Diverse (Wireless) Networks with our Test-Bed

– (Tuning & Improve our Test-Bed for Intelligent Emergency Networks)

Considerations– Considering Network Technologies

• WLAN: IEEE 802.11a/g/(pre)n• WiBro (KT WiBro)• 3G HSDPA (SKT T-Login & KTF i-plug)• Wireless Mesh Network (IEEE 802.11s)• Sensor Network (ZigBee?)

– DTN S/W• DTNRG Bundle Protocol (DTN2 & DTN Applications)

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Current Plans

Phase I: Integrated Overlay Network based on DTN Architecture (2008)

– Building DTN Test-Bed in SNU– Evaluating the Performance of Each Network Technology with

DTN– Evaluating the Performance of Integrated Overlay Network

based on DTN• Comparing TCP/IP Network (in case of DTN Scenarios)

– Improving our Test-Bed for Demo– Proposing Novel Mechanisms for Intelligent Emergency Network

• Based on Performance evaluation/analysis from our DTN Test-Bed

Phase II: Intelligent Emergency Network based on DTN Architecture (2009)

– Implementing & Evaluating our Proposed Mechanisms for Intelligent Emergency Network

– Tuning our Test-Bed for Intelligent Emergency Network

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Test-Bed Architecture

Internet

3G HSDPA/WiBro

Room 518/553-1 Building 301

Room 317/318-1Building 138

IEEE 802.11a/g/(pre)n & Directional Antenna

L2TP Tunnel

MM-DTN2

MM-DTN3MM-DTN1

MM-DTN4

Ethernet/Mesh

Ethernet/Mesh

Ethernet/WLAN

Ethernet/WLAN

DTN App(Src)

DTN AppDTN App

DTN App DTN App

DTN App

DTN App(Dst)

DTN AppDTN App

DTN App

DTN App DTN App

MM-DTN Test-Bed

Option: kiosk ??

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Network Configuration Example

Dynamic Switch

38 U

3 U

3 U

3 U

3 U

3 U

3 U

3 U

3 U

1 U

DTN N1

Dynamic

Switch

eth0

eth1

eth2eth3eth4

eth5

RACK

2u RACK Intel Server

DTN N2

DTN N3

DTN N4

KVM-1080K

DTN N0

3G/WiBro/WLAN

Connectivity Control (Based on Scenario

Files)

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Preliminary Experiments

DTN2– DTNRG’s DTN reference implementation

Preliminary Experiments– Various Links in Internet : Performance Evaluation on DTN2

• Multi-hop on all Wired Links• Multi-hop on Wired Links and WiBro Link

– Wireless Link with Antennas : Performance Evaluation• Default Omni-Antenna• Small Directional Antenna• (Grid) Directional Antenna

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Preliminary Experiments

Experimental Results : Various Links in Internet

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Preliminary Experiments

Wireless Link with Antennas

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Type GainFrequency

RangeAngle

Default Omni-Antenna

-2.4 ~ 2.5 GHz

4.9 ~ 5.85 GHzOmni-

directional

Small Directional Antenna

4/7 dBi2.4 ~ 2.5 GHz

4.9 ~ 5.85 GHz40º / 20º

(Grid) Directional Antenna

24dBi 5.725 ~

5.850MHz 12º

Preliminary Experiments

Experimental Results : Wireless Link with Antennas

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Q&A

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