Mobility

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Mobility

• Matt Hornbrook
• James Beams

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What is Mobility?

• Nodes in the network allowed to move with respect
  to one another

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Challenges of Mobility

• How does mobility affect other areas, such as
  topological management and routing.

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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

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Location Update vs. Prediction

• Location update
• Periodically record current location in database
• Can be static or dynamic, based on network
  topology, users 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
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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 users common movements,
  predict next movement

Info from Mobility Modeling and Trajectory
Prediction for Cellular Networks with Mobile Base
Stations
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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
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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
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New Communication Methods

• Provide communication between nodes when possible
• Provide a quality of service such as minimum
  latency
• Provide for good power management

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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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