Nobuhiko Nishio Department of Computer Science, Ritsumeikan University

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

mailto:[email protected]



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



Virtual reflection


ID1IP: 10.10.10.1

ID2IP: 10.10.10.2

Zaurus


:ID(MAC)PingReplyAd-hoc wireless interface



Virtual reflection


ID1IP: 10.10.10.1

ID2IP: 10.10.10.2

Zaurus


: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

Nobuhiko Nishio Department of Computer Science, Ritsumeikan University

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