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Course Project Book (Mobile Computing and Wireless Networks) CS 395T – Spring 2002 Course Instructor: Dr. Yongguang Zhang Course URL:

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Presentation on theme: "Course Project Book (Mobile Computing and Wireless Networks) CS 395T – Spring 2002 Course Instructor: Dr. Yongguang Zhang Course URL:"— Presentation transcript:

1 Course Project Book (Mobile Computing and Wireless Networks) CS 395T – Spring 2002 Course Instructor: Dr. Yongguang Zhang Course URL: May 17, 2002

2 Project List 1.Shruti : Session Migration 2.Intelligent Routing Decisions in AODV 3.Security in Ad-hoc Networks 4.Secure Group Management in Ad-hoc Network 5.UBQuards: A Smartcard Project 6.Smart Cards: Career Fair Experience 7.Content Based Routing on Ad-Hoc Networks 8.A New Service Discovery Protocol for MANET 9.Comparison of Energy-Aware Ad-hoc Routing 10.Multi-Mode TCP

3 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Design/Approach  Application layer –Application API to get/set application state  Session Manager daemon –Provides interaction between Home Agent and all user state  Home Agent –Stores the user’s session state  Socket Migrator –Uses IP redirection to offer same abstraction –Transfers TCP state Challenges Faced, Lessons Learnt  Modifications to legacy applications  Maintaining portability  Implementation & Integration  32-bit IP insufficient for unique PK abstraction that combines security and authentication  Pre-publish or perish –http://www.cs.cmu.edu/~softagents/migsock/M IGSOCK-ThesisPresentation.ppt Shruti : Session Migration Future work  Migrate –Other applications (mp3, ram) –User Mode Linux –Bosch virtual machine simulator  Application layer –Use condor style-checkpointing –Create new language abstractions  Home agent using smartcard Project team:Amit, Amol, Ravi, Deepak, Divya, Young-Ri URL: Application Network level App State To other end host TCP Personal IP IP

4 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Implementation Issues  Simulated these extensions on ns-2  Experimented with varying parameters –Optimum Beaconing Interval –Dynamically adjust wait time at destination  Performance comparison with base AODV –Used Different mobility patterns of pause time and speeds New Ideas  Using signal strength values to predict the link life time and hence stability of a route –Choose more stable routes  Maintaining multiple paths for a destination –Decreases route discovery latency –Reduce the effect of route failures Intelligent Routing Decisions in AODV Results/Lesson Learned Project team: Gokhan Uluderya, Jared G. Boone & Ashish Ahuja URL: Key Design/Approach  Figure out how to measure life time of a link –Use Friis law to predict the relative position of a neighbouring node  Keep a secondary routing table –If primary route fails, use secondary route –If both routes fail, initiate route discovery

5 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Key Design/Approach  Provide a broad reading list for research in the area  Leverage existing work in security for basis of solutions  Adapt existing algorithms to ad-hoc networks  Utilize existing toolkits for cryptographic algorithms Algorithms Implemented  Password-authenticated group key establishment  Threshold cryptography shared secret division by trusted party, then recollection by clients Security in Ad-hoc Networks Results/Lesson Learned  Implemented in Java  Used Java Cryptographic Extensions (JCE) –Sun’s JCE provider for Triple-DES –BouncyCastle.org’s for AES and RSA  Lesson learned: –Many existing security solutions are unsuitable due to lack of on-line server or predefined hierarchy –We must assume a prior context Project team: Kevin Kane URL: Paper Themes Surveyed  Group key establishment –Password-authenticated –Unauthenticated  Threshold cryptography –Secret sharing –Distributed cryptographic operations  Web of trust –“Introducers”

6 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Simulation Results Secure Group Management in Ad-hoc Network Conclusion  Has clear advantage in terms of connection time against the centralized approach.  Need further optimization to adapt frequent topology changes. Project team: Chun-Chi Chen, Edwin Ng, Chwan-Ming Wang URL: Motivation  Security in ad hoc networks is a necessity.  Not many simulations or implementations for security have been done in ad hoc networks.  Centralized approach is not suitable.  Investigate a distributed solution for key management. Architecture  Works on top of existing routing protocols.

7 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Key Design/Approach  Web service language interpreter – Run as a Cardlet – 32K Javacard, Stripped down JVM – 1 input, 1 output instruction set – only integer types – control flow using predicates  Communication Module  Consumer Device  Web Services – Microsoft.NET Platform, SOAP New Ideas  Specification for using smartcards as the medium for ubiquitous web services  User state information on card – stateless web service servers  Web service workflow description  Hardware/Software specification for universal communication module UBQuards: A Smartcard Project Results/Lesson Learned  Proof of Concept – Smartcards + Ubiquitous – Software Implementation  Ubiquitous Communication Module – USB, HTTP/SOAP, WFDL – Smartcards Computing Power Increasing  Example Scenario – Plug-n-Play Internet Capability –Communication, Storage, “device stuff” completely detached. Project team: Changkyu Kim, Karu Sankaralingam, Youngin Shin URL: CM CardletDeviceWeb Service

8 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Design/Approach  VB front end for sending/receiving resume  Resume and BizCard in XML format –Standardized format and parsing –Applet on smart card has a simple parser  Students have an interface to personalize the data they want from recruiter  Implementation platform: –SLB 4.1 toolkit and REFLEX 72 card reader –Metrowerks CodeWarrior IDE for debugging and simulator on Windows 2000 platform New Ideas  Current literature focuses on the security aspect of smart cards  Exploit smartcards for personalization  Saves effort and more efficient and easier for students and recruiters  Recruiters anyway have to “scan” the resume into the database Smart Cards: Career Fair Experience Results and Future work  Challenging to program with limited data types and memory  Developed prototype to demonstrate simple processing on and off the card.  Smart cards still not ready –Memory too low, (use compression on host side), garbage collection (Java Card) –Tool kit unstable and Simulator not very reliable –Few data types, array of objects or 2-D arrays not available Project team: Kaushik Lakshmanan and Ramanathan Pallassana

9 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Motivation  Peer-to-peer applications : content driven  No centralized DNS for name-lookup in MANETs  Current protocols have to decouple steps of name to address mapping and route discovery  Combine! -- Content based routing Content Based Routing on Ad-Hoc Networks Results/Lesson Learned  Implemented in NS2  Comparison –Plain flooding vs Our Content-Routing –Metric –Traffic : over 80% reduction –Route cache hit rate : about 27% –Control traffic : negligible  Lesson learned: –Think out of the box –challenge to implement a whole new protocol in ns Project team: Vivek Subramanian & Amish Gandhi URL: or Key Ideas/Design  Nodes maintain information if they are on a path towards content  Communication : local broadcast  Associate a path-id with every path discovered  Eliminate IP-Address/node-id  For optimization :use pseudo random local-id  Distance metric : hop count Content Routing Agent LL P2P App Agent Channel MAC Content Requested Reply with Content

10 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Motivation  Service Discovery will become a crucial need for upcoming networks/devices for seamless interoperability  Existing Protocols –JINI, UPNP, SLP, Salutation, etc..  Existing protocols are unsuitable for Mobile AdHoc Networks  We Propose and implement a new SDP for MANETs. New Ideas  Distributed directory  Cache optimizations (ala DSR, AODV)  Periodic Broadcast based Service Advertisement.  Transparent to underlying routing protocols  Each node serves as a Service Agent, Directory agent and also User agent A New Service Discovery Protocol for MANET Results/Lessons Learned  File Sharing Application implemented in java  Tested using AdHoc toolkit  Used Socket Library extension to emulate the mobile environment  Lessons learned: – Using AdHoc toolkit – Various SDPs Project team: Krupakar V. Pasupuleti, Jisun Park and Subramanyam Mallela URL: MANET Master Slave AdHoc Tool Kit Environment Service Agent Agent API Application

11 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Simulation Setup  Use the ns-2 simulator.  Parameters: traffic load (number of source nodes and traffic rate), mobility (pause time, speed).  Matrices: Packet delivery rate vs. traffic load, packet loss rate vs. mobility, network lifetime vs. traffic load, network lifetime vs. mobility, nodes survival percentage vs. time. Algorithm  Span: Only “coordinator” nodes stay awake. The “non-coordinator” nodes go to sleep.  Afeca: Sleep depending on the number of transmitting neighbors.  FA: Choose the minimum cost routing path.  DSR Comparison of Energy-Aware Ad-hoc Routing Results/Lesson Learned Project team: Pisai Setthawong, Hari Shankar, Yihong Zhou URL: Motivation  Important to ensure battery-operated mobile nodes operate as long as possible.  Several solutions proposed and compared with non-energy-aware protocols.  Our goal is to compare different solutions under DSR using same parameters.

12 A CS395T Course Project Mobile Computing & Wireless Networks Spring 2002 Course web site: Instructor: Dr. Yongguang Zhang Experiment Result MM-TCP  When the bandwidth of bottlenet changes frequently, TCP can save a subset of current TCP states (mode).  When TCP return to a history network enviorment, it can use the saved mode to set some initial values, such as cwnd.  TCP can adapt the enviorment quickly and then improve the performance. Multi-Mode TCP Conclusion/Lesson Learned  Implemented in ns2  Simulation results in ns2 –There are some improvements when TCP switches between different network enviorment. But the improvement is not large enough.  Lesson learned: – Implementation of TCP stack –Simulation an evaluation Project team: Yi Li URL:

13 Contact Prof. Yongguang Zhang Dept. of Computer Sciences University of Texas at Austin Austin, Texas 78712, U.S.A. Phone:


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