test-bed for testing scenarios of new dtn architecture asiafi 2008 august, 2008 multimedia and...
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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.
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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
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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
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Link LayerLink Layer
PHY (Software Defined Radio)PHY (Software Defined Radio)
TransportTransport
ApplicationApplication
NetworkNetwork
Ma
na
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
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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
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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
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Preliminary Experiments
Experimental Results : Wireless Link with Antennas
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Q&A
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