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Optimizing the Topology of Bluetooth Wireless Personal Area Networks
Marco Ajmone Marsan, Carla F. Chiasserini, Antonio Nucci, Giuliana Carello, Luigi De Giovanni
IEEE INFOCOM 2002
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Outline Introduction Problem Statement Integer Linear Programming (ILP)
formulation Numerical Results Conclusion
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Introduction(1) Wireless Personal Area Network (WPAN)
Short-range battery-operated radio devices 2.4GHz ISM band FHSS
Bridges Re-synchronize with the piconets imply a
significant overhead that effect the system performance
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Introduction(2) The role of a node
Master of Slave? Selection has a significant impact on
the capacity and the throughput of the system.
Former researches are not suitable Single channel communication? Transmit power control?
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Problem Statement Full network connectivity System specification System complexity Traffic requirement Constraints on the nodes’ role
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ILP Formulation(1) Notation
N : the set of network nodes Z : the matrix containing the values of the distances between any two nodes S : the set of traffic sources D : the set of destination nodes Zmax : the maximum radius of a piconet
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ILP Formulation(2)
the set of source-destination connections C=|C| , the total number of connection through this network T={tij} be the traffic matrix indication the information rate on each source-destination connection
},:),{( DdSsdsC
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ILP Formulation(3) Ps : the total average traffic rate Mmax : maximum number of piconets Xmax : maximum number of active nodes that can be assigned to a piconet M : node that are forced to be masters
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ILP Formulation(4)
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ILP Formulation(5)
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ILP Formulation(6)
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ILP Formulation(7)
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ILP Formulation(8)
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ILP Formulation(9)
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Example(1)
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Example(2)
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Example(3)
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Example(4)
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Numerical Results(1)
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Numerical Results(2)
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Numerical Results(3)
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Conclusion Optimized topologies can be quite
robust to changes in the traffic pattern
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Discussion Centralized or distributed solution?
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Thank You