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Mobility

Mobility. Matt Hornbrook James Beams. What is Mobility?. Nodes in the network allowed to move with respect to one another. Challenges of Mobility. How does mobility affect other areas, such as topological management and routing. Can mobility be modeled?.

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Mobility

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  1. Mobility Matt Hornbrook James Beams

  2. What is Mobility? • Nodes in the network allowed to move with respect to one another

  3. Challenges of Mobility • How does mobility affect other areas, such as topological management and routing.

  4. Can mobility be modeled? • If so, then nodes can be tracked or their positions predicted, then current topological management and routing schemes can be modified and used • If not, then new methods of communication will be required

  5. Location Update vs. Prediction • Location update • Periodically record current location in database • Can be static or dynamic, based on network topology, user’s call, mobility pattern • Benefits of adding location prediction? • Resource reservation (in advance) • Trajectory (routing) updates/forwarding • More? Info from: Mobility Modeling and Trajectory Prediction for Cellular Networks with Mobile Base Stations

  6. How to model movement? • Traditional • Straight-line motion • Acceleration with finite states (semi-Markov) • Non-traditional (nonlinear) • Bounded, unknown noise • Sensor measurement noise at base station • Library-based • Build-up library of user’s common movements, predict next movement Info from: Mobility Modeling and Trajectory Prediction for Cellular Networks with Mobile Base Stations

  7. Where to keep track of movement? • At base stations? • Current PCS networks • Based on complicated algorithms, dependent on particular noise model • Benefits? Shortcomings? • At mobile unit? • Proposed techniques • Reduce signaling traffic • Independent of noise model • Efficient algorithms Info from: Mobility Modeling and Trajectory Prediction for Cellular Networks with Mobile Base Stations

  8. How to measure effectiveness of a mobile scheme? • Mobility impacts performance of routing protocols • How to measure impact? • Power consumption/node life • Link/Path duration, throughput, overhead • Can routing protocols be broken into fundamental “building blocks?” • Measure impact of each portion of protocol Info from: PATHS: Analysis of PATH Duration Statistics and their Impact on Reactive MANET Routing Protocols

  9. New Communication Methods • Provide communication between nodes when possible • Provide a quality of service such as minimum latency • Provide for good power management

  10. Communication between nodes • Connectivity (Link, Path, Network) • How to handle communications when link is broken • How to handle communications when path is broken

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