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Research Projects at Rits
Ubiquitous Computing in the Streets:Through Vending Machine Network
to N-1 Network Simulation
Nobuhiko Nishio
Department of Computer Science,
Ritsumeikan University
Outline
• Ubiquitous Computing & Communication Laboratory
• Personnel
• Related Projects
• Future Focus
UCCL and Related Projects
• Ubiquitous Computing and Communication– United Spaces
• Ubiquitous service architecture
• Location information service
– Improvised Network• Vending Machine Networking
• N-1 Network Simulation
Personnel
• Post-Doctoral– Gaute Lambertsen: Improvised Network
• Ph.D. student– Eiji Takimoto: N-1 Network Simulation
• M.S Student– Kazuhiro Suzuki
• Undergraduate Students– Minoru Matsui: United Spaces– Tomoaki Moriyama: United Spaces
United Spaces Project
Nobuhiko Nishio
Department of Computer Science,
Ritsumeikan Univeristy
Software Architecture for Smart Spaces (Yet another…)
• Collaboration with Uchida Inc. (Furniture company)
• Software for SmartPAO and mobile host:– SmartLaboratory– SmartMeeting– SmartPresentation
Key issues is Space Management
• Key chain obtained by space login
• Operations on multiple spaces– Connection: between remote spaces– Fusion: between local spaces– Multi-space login
• Secure service proxy– Dynamic GUI generation with expiration
Building Applications Robust to Node-Mobility in Downtown Improvised Sensor Networks
Eiji Takimoto1,2
Gaute Lambertsen 1 and Nobuhiko Nishio 1,2
1Japan Science and Technology Agency2Ritsumeikan University
Sensor Networks Improvised Among Downtown Users
• A spontaneous realization of ad-hoc network of wireless sensor nodes.
• Sensor nodes are people carrying mobile devices– e.g. cell-phones or PDA equipped with short-range wireless
communication– Or cars equipped with wireless communication devices
• Our research project aims:– To effectively run third party applications unnoticed by node
owner.– Applications like advertisement delivery, personal
navigation and outdoor game entertainment etc.
Vending Machine Networking
• Coca Cola, KEPCO, etc.• Fiber networking vending machines
– Landmark and sink-node
• Cooperation with mobile nodes• Novel services and applications:
– Navigation/tour guidance– Security surveillance– Local traffic information casting– Etc.
Hybrid Network with Vending Machine Network and MANET
Fiber Network Infrastructure
: Traveling Node
: Next Landmark Node
: Current Neighbor Node
: Other Mobile Node
One Navigation Step
: Previous Landmark Node
Hot-zone cluster
Qualified paths
N-1 Network Simulation: A Mixed-Reality Approach for Wireless Ad-hoc
Network Performance Evaluation
Nobuhiko Nishio [email protected]
Eiji Takimoto [email protected]
Gaute Lambertsen [email protected]
Japan Science and Technology Agency
PRESTO 21: Precursory Research for Embryonic Science and Technology
Ritsumeikan University, Dept. of Computer Science1-1-1 Noji-Higashi, Kusatsu-shi, Shiga 525-8577, Japan
Tel. +81-77-566-1111 (Ext. 7466), Fax. +81-77-561-2669
N-1 Network Simulation: Representation of a real node in a virtual world
REPRESENTATION OF REAL NODE
SIMULATED OBJECTS
Evaluation of ideas
• Moving from simulations to experiments– So far, evaluation by network simulators– However, real node evaluation is also important
• Difficulties in managing experiments– All nodes are mobile– A large number of mobile nodes– Experimentation environment– Inference with other networks
• We are constructing a test-bed using real nodes in a practical fashion
N-1 Network Simulation
• N-1 nodes are implemented in the simulation (virtual nodes)
• 1 node is implemented on an actual node• Packets from virtual nodes to the real node
– Spoofed by the simulator host and transmitted over the wireless interface
• Packets from the real node to the virtual nodes – The simulator host retrieves all packets, and transmits it
to the nodes in the simulation with virtual packets
N-1 Network Simulation
Real world
Simulated world
Virtual packet
Real packet from simulated world
Simulator host Real mobile host
Correspondent host
Virtual packet into real world
Virtual packet from real world
Real packet into simulated world
N-1 implemented over ns-2 platform
• Network simulator 2 (ns-2) emulation functionality– Real-time scheduler– Packets retrieved by Tap object– Packets transmitted by Network agent
• Wireless network extensions– Examination of packet arrival– Support for node mobility
• Input of node mobility• Reflection of node mobility in the simulation
– Reflection of radio signal strength
Simulator host, IP: 10.10.10.100, MAC: PCMAC…
Actual nodeIP: 10.10.10.10MAC: …
Virtual reflection
Simulator node 2Simulator node 1
ID1IP: 10.10.10.1
ID2IP: 10.10.10.2
Zaurus
PCMAC: SimIPID:ID(MAC)---------------
:ID(MAC)Ad-hoc wireless interface
Simulator host, IP: 10.10.10.100, MAC: PCMAC…
Actual nodeIP: 10.10.10.10MAC: …
Virtual reflection
Simulator node 2Simulator node 1
ID1IP: 10.10.10.1
ID2IP: 10.10.10.2
Zaurus
PCMAC: SimIPID:ID(MAC)---------------
:ID(MAC)PingReplyAd-hoc wireless interface
Simulator host, IP: 10.10.10.100, MAC: PCMAC…
Actual nodeIP: 10.10.10.10MAC: …
Virtual reflection
Simulator node 2Simulator node 1
ID1IP: 10.10.10.1
ID2IP: 10.10.10.2
Zaurus
PCMAC: SimIPID:ID(MAC)---------------
:ID(MAC)Ad-hoc wireless interface Reply
Create header(ether, ID, ICMP)
Retrieve and analyze packets forID1 and ID2
ARP request
ARP response
Ping
Future work• Static -> Mobile virtual nodes
– Simulation nodes move
– Reflection of variations in signal strength inside the simulator
• Mobility support for the real node– Simulated mobility through the user interface
• Additional wireless signal interfaces
• Virtual mobility reflected by changes in received signal strength
Simulator platform
Real node
Wireless interfaces
Variation in distance/signal strength over wireless link
Demo@MobiCom2003
Future Focus
• Inter-Ubiquitous Networking– Operations on multiple Smart Spaces– Connection, fusion, extraction, etc…
• Enter into a space A wearing the other space B• TV conference by connecting multiple spaces
– Heterogeneous policy resolution• User authentication• Media/Service description• Communication hand-off