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Mobility

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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