Matt Hornbrook James Beams 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? 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

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

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

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

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

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

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