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Prof. Guevara Noubir, noubir@ccs.neu Background: 1996: PhD from ETH-Lausanne

Prof. Guevara Noubir, noubir@ccs.neu.edu Background: 1996: PhD from ETH-Lausanne 1997-2000: senior research scientist at CSEM (Neuch âtel)

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Prof. Guevara Noubir, noubir@ccs.neu Background: 1996: PhD from ETH-Lausanne

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  1. Prof. Guevara Noubir, noubir@ccs.neu.edu • Background: • 1996: PhD from ETH-Lausanne • 1997-2000: senior research scientist at CSEM (Neuchâtel) • Participated to the main 3G-UMTS European Projects (FRAMES, RAINBOW, SLATS) and other projects on wireless networks (European Space Agency: IPSAT, MAD: Hiperlan 2, etc.) • Main Research Area: Quality of Service for Wireless Systems • Optimal resource management • Reliability, fault-tolerance • Security • Current Research: • Development of adaptive schemes for optimal resource management in wireless systems with applications in multi-hop wireless ad-hoc networks and cellular wireless communication systems • Underlying technology: IEEE802.11, Bluetooth (scatternets), home built low-power wireless interfaces

  2. Constraints in Wireless Multi-Hop Ad Hoc Networks (MANET) • Limited radio spectrum • Broadcast Medium (resulting in collisions and interference) • Limited power available at the nodes (i.e., energy, computation) • Limited storage memory • Connection QoS requirements (e.g., delay, packet loss) • Unreliable network connectivity (depends on the channel) • Dynamic topology (i.e., mobility of nodes => variable density) • Need to provide a full coverage • Need to enforce fairness

  3. Parameters Available to System Designer in MANET • Use of various coding/modulation schemes • Use of packets fragmentation • Use of various transmission power level • Use of a single hop or multiple hops • Use of multiple RF interfaces (multiple IF characteristics) • Clustering and backbone formation • Planning of the fixed nodes location • Packets scheduling schemes • Application adaptivity

  4. Approach: Adaptivity and Cooperation • Classical networking stacks have only minimum interaction between adjacent layers • Multi-hop wireless ad hoc networks require more cooperation between layer because: • Channel variation and network topology changes affect the application • Routing versus single hop communication considerably affects the medium access control (MAC) performance and physical layer interference • Collisions versus channel fading affects both the physical layer and the MAC • Battery power has implications on all layers

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