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Current Wireless Networking Research Directions from MobiCom 2007 Conference

Bob Kinicki PEDS September 24, 2007. Current Wireless Networking Research Directions from MobiCom 2007 Conference. Outline. Observations from Workshop on Wi reless N etwork T estbeds, E xperimental evaluation and CH aracterization ( WiNTECH 2007) Keynotes and Panel Themes

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Current Wireless Networking Research Directions from MobiCom 2007 Conference

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  1. Bob Kinicki PEDS September 24, 2007 Current WirelessNetworking ResearchDirections fromMobiCom 2007 Conference

  2. Outline • Observations from Workshop on Wireless Network Testbeds, Experimental evaluation and CHaracterization (WiNTECH 2007) • Keynotes and Panel Themes • Notes, highlights and trends from MobiCom papers • Random thoughts based on poster sessions and student demonstrations PEDS September 24, 2007 – MobiCom 07 Research Directions

  3. WinTECH Workshop • Keynote: GNU Radio as experimental platform • Publicly available tool for audio experimentation on wireless testbeds. • Several wireless testbeds within campus structure (e.g., Purdue) • Crossbow MicaZ seems to be the new sensor node of choice. • There was new activity involving PHY – MAC layer cross-layering. PEDS September 24, 2007 – MobiCom 07 Research Directions

  4. WinTECH Workshop • Wireless testbed architectures include VINI (Princeton) and ORBIT (radio grid ‘emulator’ system available at Rutgers) • Physical Layer issues explored: • Capture effect of stronger signal • Inherent unfairness in overlapping AP domains (e.g. use ‘traffic shaper’ to throttle APs). PEDS September 24, 2007 – MobiCom 07 Research Directions

  5. Keynotes and Panels • SIGMOBILE's Outstanding Contributions Award Lecture David CullerTinyOS and Low-Power Wireless Networking - a Study in Realistic Abstraction • Keynote AddressDr. David TseBreaking the Interference Barrier • Panel: Bonobos Vs Chimps: Cooperative and Non-Cooperative Behavior in Wireless NetworksModerator: Jean-Pierre Hubaux, EPFLParticipants: Ramesh Johari, StanfordP. R. Kumar, Illinois, Heather Zheng, UCSB PEDS September 24, 2007 – MobiCom 07 Research Directions

  6. MobiCom Papers Session: Medium Access Control • Scheduling Algorithms for Multi-Carrier Wireless Data SystemsMatthew Andrews (Bell Labs, Lucent Technologies, US); Lisa Zhang (Bell Labs, Lucent Technologies, US) • Multi-carrier scheduling (CDMA, WIMAX, EVDO, LTE (OFDMA)) • Idea: Assign different user types to different carrier technologies. • Superimposed Code based Channel Assignment in Multi-Radio Multi-Channel Wireless Mesh Networks Kai Xing (The George Washington University, US); Xiuzhen Cheng (The George Washington Univ, US); Qilian Liang (The University of Texas at Arlington, US); Liran Ma (The George Washington University, US) • Important to support both unicast and broadcast • CSMA/CA {802.11} is inadequate for mesh networks • Used an Interference Model • MIMO multi-channel used for interference reduction • How do mesh networks know which channel to listen to and which channel to transmit on? • Optimal Channel Probing and Transmission Scheduling for Opportunistic Spectrum Access Nicholas Chang (University of Michigan, US); Mingyan Liu (University of Michigan, US) • Channel quality is time-varying  need probes • Probe for quality using RTS/CTS; receiver sends SNR in CTS • This is a joint probing and scheduling problem PEDS September 24, 2007 – MobiCom 07 Research Directions

  7. MobiCom Papers Session: Sensor Networks • Trade-offs Between Mobility and Density for Coverage in Wireless Sensor Networks Wei Wang (National University of Singapore, SG); Vikram Srinivasan (National University of Singapore, SG); Kee Chaing Chua (National University of Singapore, SG) • Coverage is the issue here. Worry about cascaded moving. • Considered homogeneous and heterogeneous WSNs where a limited number of mobile sensors can be matched to holes. • Rendered Path: Range-Free Localization in Anisotropic Sensor Networks with Holes Mo Li (Hong Kong University of Science and Techonlogy, HK); Yunhao Liu (Hong Kong University of Science and Technology, HK) • Automatic localization popped up all over the conference. Here, the believe is for some WSN applications, sensors need to know where neighbors are located. PEDS September 24, 2007 – MobiCom 07 Research Directions

  8. MobiCom Papers Session: Sensor Networks (cont.) These two papers address a new ‘buzz’ topic – Barriers !! • Designing Localized Algorithms for Barrier Coverage Ai Chen (Ohio State University, US); Santosh Kumar (University of Memphis, US); Ten-Hwang Lai (Ohio State university, US) • Reliable Density Estimates for Achieving Coverage and Connectivity in Thin Strips of Finite Length Paul Balister (University of Memphis, US); Amites Sarkar (University of Memphis, US); Bela Bollobas (University of Memphis, US); Santosh Kumar (University of Memphis, US) PEDS September 24, 2007 – MobiCom 07 Research Directions

  9. MobiCom Papers Session: Security and Privacy • DARWIN: Distributed and Adaptive Reputation mechanism for Wireless ad-hoc Networks Juan Jose Jaramillo (University of Illinois at Urbana-Champaign, US); R. Srikant (University of Illinois at Urbana-Champaign, US) • Concerned with rewards/punishments for forwarding packets • 802.11 User Fingerprinting Jeffrey Pang (Carnegie Mellon University, US); Benjamin Greenstein (Intel Research Seattle, US); Ramakrishna Gummadi (University of Southern California, US); Srinivasan Seshan (Carnegie Mellon University, US); David Wetherall (University of Washington, US) • The issue is location privacy (i.e., worrying about tracking people locations through trends in wireless node locations over time). • In this case, a unique MAC address is a problem!! • Robust Location Distinction using Temporal Link Signatures Neal Patwari (University of Utah, US); Sneha Kasera (University of Utah, US) • The idea is to develop unique transmitter signature. {Difficult to do!} • When transmitter moves or attacker impersonates source, receiver can tell by signature change. • Mining call data to increase the robustness of cellular networks to signaling DoS attacks Hui Zang (Sprint ATL, US); Jean Bolot (Sprint, US) • Used recorded cell phone behavior to speed up paging times on cell phones. PEDS September 24, 2007 – MobiCom 07 Research Directions

  10. MobiCom Papers Session: Cross-layer Techniques • Adaptive Network Coding and Scheduling for Maximizing Throughput in Wireless Networks Prasanna Chaporkar (Norwegian University of Science and Technology, NO); Alexandre Proutiere (Microsoft Research, UK) • Picks up on COPE algorithm (XOR packet sending scheme) • Network Coding (NC) was another buzz word at conference. • This paper shows NCcan lower throughput. • Hence, transmission scheduling needs to be NC aware. • Beyond the Bits: Cooperative Packet Recovery Using PHY Information Grace Woo (Massachusetts Institute of Technology, US); Pouya Kheradpour (MIT, US); Dawei Shen (MIT, US); Dina Katabi (MIT, US) • SOFT is another cross-layering idea that recovers a correct frame from its faulty reception by using confidence values for 0 or 1 which are available in PHY. • They used GNU radio application and interfaces for implementation and testing. PEDS September 24, 2007 – MobiCom 07 Research Directions

  11. MobiCom Papers Session: Mobility/Interference Models • Crossing Over the Bounded Domain: From Exponential To Power-law Inter-meeting Time in MANET Han Cai (North Carolina State University, US); Do Young Eun (North Carolina State University, US) • Claim: Inter-meeting time is a key wireless metric. • They show this time has exponential tail up to a point and then becomes power-law tail. • There results indicate this behavior is due to a finite boundary around the domain space. • A General Model of Wireless Interference Lili Qiu (The University of Texas at Austin, US); Yin Zhang (University of Texas at Austin, US); Feng Wang (University of Texas at Austin, US); Mi Kyung Han (University of Texas at Austin, US); Ratul Mahajan (Microsoft Research, US) • This paper is part of buzz on Interference Modeling for wireless networks. • They claim to develop a measurement-based interference model. • ‘Heavy’ queuing theory but used traces and simulation to show accuracy of theoretical model. PEDS September 24, 2007 – MobiCom 07 Research Directions

  12. MobiCom Papers Session: Mobility/Interference Models (Cont.) • Power law and exponential decay of inter contact times between mobile devices Thomas Karagiannis (Microsoft Research, UK); Jean-Yves Le Boudec (EPFL, CH); Milan Vojnovic (Microsoft Research, UK) • Similar to first paper in session in results presented. • Study of a Bus-Based Disruption Tolerant Network: Mobility Modeling and Impact on Routing Xiaolan Zhang (University of Massachusetts, Amherst, US); James F. Kurose (University of Massachusetts at Amherst, US); Brian Levine (University of Massachusetts at Amherst, US); Don Towsley (University of Massachusetts at Amherst, US); Honggang Zhang (Suffolk University, US) • Some what obvious results in bus networks over UMass campus where laptops travel on buses and record information about closeness to facilitate relaying information. PEDS September 24, 2007 – MobiCom 07 Research Directions

  13. MobiCom Papers Session: Challenges • Challenges: Towards Truly Scalable Ad Hoc Networks Zheng Wang (University of California Santa Cruz, US); Hamid Sadjadpour (University of California, Santa Cruz, US); J.J. Garcia-Luna-Aceves (University of California at Santa Cruz, US) • Very theoretical presentation – all big O notation. • Challenges: Peers on Wheels - A Road to New Traffic Information Systems Jedrzej Rybicki (Heinrich Heine University Duesseldorf, DE); Bjorn Scheuermann (Heinrich Heine University Dusseldorf, DE); Wolfgang Kiess (Heinrich Heine University Duesseldorf, DE); Christian Lochert (Heinrich Heine University Dusseldorf, DE); Pezhman Fallahi Khorasani (Heinrich Heine University Dusseldorf, DE); Martin Mauve (Heinrich Heine University Dusseldorf, DE) • VANETs was another buzz at the conference. • This talk focused on the fact that VANETs did not solve the problem wrt traffic and in the future these traffic systems would be used. • Challenges: Device-free Passive Localization for Wireless Environments Moustafa Youssef (University of Maryland, US); Matthew Mah (University of Maryland, US); Ashok K. Agrawala (University of Maryland, US) • More about localization. PEDS September 24, 2007 – MobiCom 07 Research Directions

  14. MobiCom Papers Session: Measurements • Adaptive Contact Probing Mechanisms for Delay Tolerant Applications Wei Wang (National University of Singapore, SG); Vikram Srinivasan (National University of Singapore, SG); Mehul Motani (National University of Singapore, SG) • Interested in and measured contact patterns of volunteer cell phone users in Singapore. • A Measurement-Based Approach to Modeling Link Capacity in 802.11-based Wireless Networks Anand Kashyap (SUNY at Stony Brook, US); Samir Das (SUNY at Stony Brook, US); Samrat Ganguly (NEC Labs, US) • Developed an analytic model for 802.11 link capacity that put significant importance on AP interference/interaction. • ‘Validated’ model on a controlled WLAN and induced only UDP traffic through neighboring APs. • MDG: Measurement-Driven Guidelines for 802.11 WLAN Design Ioannis Broustis (University of California, Riverside, US); Konstantina Papagiannaki (Intel Research, US); Srikanth Krishnamurthy (University of California, Riverside, US); Michalis Faloutsos (University of California Riverside, US); Vivek Mhatre (Bell Labs, IN) • Interested in AP interference. • Measure and develop a new algorithm that considers frequency selection, user association to an AP and power control. PEDS September 24, 2007 – MobiCom 07 Research Directions

  15. MobiCom Papers Session: Routing and Multicasting {I had to leave and did not attend this session} • Multicast Capacity for Wireless Networks Xiang-Yang Li (Microsoft Research Asia, Beijing; Illinois Institute of Technology, US); Shao-Jie Tang (Illinois Institute of Technology, US); Ophir Frieder (Illinois Institute of Technology, US) • On Designing Collusion-Resistant Routing Schemes for Non-Cooperative Wireless Ad Hoc Networks Sheng Zhong (SUNY Buffalo, US); Fan Wu (State University of New York at Buffalo, US) • Weak State Routing for Large Scale Dynamic Networks Utku Acer (Rensselaer Polytechnic Institute, US); Shivkumar Kalyanaraman (Rensselaer Polytechnic Institute, US); Alhussein Abouzeid (Rensselaer Polytechnic Institute, US) PEDS September 24, 2007 – MobiCom 07 Research Directions

  16. Posters and Demos General Observations: • The posters and demos were far more practical. • Many posters on Mesh networks, location detection, security and VANETs. • Several practical demos involving sensors. • Except for the more theoretical posters, WPI graduate students could produce comparable practical results if we had easily accessible testbeds. PEDS September 24, 2007 – MobiCom 07 Research Directions

  17. Questions? Thank You! PEDS September 24, 2007 – MobiCom 07 Research Directions

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