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

Contents Intelligent Emergency DTN Architecture Related Test-Bed Projects – TIER – EDIFY – Tetherless Computing – SPINDLE Test-Bed for testing scenarios of new DTN architecture – Objective – Current Plan – Architecture – Preliminary Experiments -2-

Intelligent Emergency DTN Architecture

Motivation 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 -4-

Motivation 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 … -5-

SDR capable node Normal node (cellular) Normal node (WiFi) Tangshan, China earthquake, May, 12, 2008 Scenarios -6-

7 WiFi 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 DTN WiFi Connection

Link Layer PHY (Software Defined Radio) Transport Application Network Management Module (Active Network) Topology Control... Neighbor Discovery … Reliable Transport … Intelligent Emergency DTN Scanning, & Frequency Adaptation DTN Bundle -8-

Related Test-Bed Projects

Related Projects Reference URL : DTNRG –

TIER TIER : Technology and Infrastructure for Emerging Regions – University of California at Berkeley – 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 -11-

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 -12-

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 -13-

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 -14-

Test-Bed for testing scenarios of 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 a/g/(pre)n WiBro (KT WiBro) 3G HSDPA (SKT T-Login & KTF i-plug) Wireless Mesh Network (IEEE s) Sensor Network (ZigBee?) – DTN S/W DTNRG Bundle Protocol (DTN2 & DTN Applications) -16-

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 -17-

Test-Bed Architecture MM-DTN Test-Bed Option: kiosk ?? -18-

Network Configuration Example Dynamic Switch DTN N1 Dynamic Switch eth0 eth1 eth2 eth3 eth4 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) -19-

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 -20-

Preliminary Experiments Experimental Results : Various Links in Internet -21-

Preliminary Experiments Wireless Link with Antennas -22- TypeGainFrequency RangeAngle Default Omni- Antenna ~ 2.5 GHz 4.9 ~ 5.85 GHz Omni- directional Small Directional Antenna 4/7 dBi 2.4 ~ 2.5 GHz 4.9 ~ 5.85 GHz 40º / 20º (Grid) Directional Antenna 24dBi5.725 ~ 5.850MHz12º

Preliminary Experiments Experimental Results : Wireless Link with Antennas -23-

Q&A -24-