1. Matt Hornbrook James Beams
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
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 Non-traditional (nonlinear)
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