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Tehuang Liu and Wanjiun Liao National Taiwan University, Taipei Taiwan IEEE GLOBECOM 2008

Tehuang Liu and Wanjiun Liao National Taiwan University, Taipei Taiwan IEEE GLOBECOM 2008. Interplay of Network Topology and Channel Assignment in Multi-Radio Multi-Rate Multi-Channel Wireless Mesh Networks. Outline. Introduction Network Model

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Tehuang Liu and Wanjiun Liao National Taiwan University, Taipei Taiwan IEEE GLOBECOM 2008

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  1. Tehuang Liu and Wanjiun Liao National Taiwan University, Taipei Taiwan IEEE GLOBECOM 2008 Interplay of Network Topology and Channel Assignment in Multi-Radio Multi-Rate Multi-Channel Wireless Mesh Networks

  2. Outline • Introduction • Network Model • A Universal Algorithm for Constructing Input Network Topologies • Performance Evaluation • Conclusion

  3. Introduction • Most existing static channel assignment algorithms are based on specific network topologies • tree • k-connected graph • same topology as that in the singe-channel environment • In this paper, we refer to this pre-determined network topology as the input network topology of the channel assignment algorithm.

  4. Introduction • Impact of Input Network Topologies on Network Capacity • Network Connectivity • Radio Utilization • Channel Diversity • Quality of Active Links

  5. Network Model • Transit Access Point • One or multiple radios • Transmission range: r • Interference range: R (>=r) • Network Topology • G=(V,E)

  6. A Universal Algorithm for Constructing Input Network Topologies • Link Quality Quantification • Bad-Quality Link Elimination • Radio Utilization Enhancement

  7. A Universal Algorithm for Constructing Input Network Topologies • Link Quality Quantification • Unit Transmission Time(UTT) • decide whether a link in G shall be included in Gi Data rate Packet loss rate Dijkstra’s algorithm

  8. A Universal Algorithm for Constructing Input Network Topologies • Bad-Quality Link Elimination => =>

  9. A Universal Algorithm for Constructing Input Network Topologies the number of radios of node v • Radio Utilization Enhancement

  10. A Universal Algorithm for Constructing Input Network Topologies • Radio Utilization Enhancement 2 2

  11. Performance Evaluation • NS-2 • 9-node grid WMN • Node has two radios • Five non-overlapping channels={a, b, c, d, e} • 80.211a: TR= 225m, IR= 450m • Transmission rate: randomly (6~54 Mbps) • Packet error rate: 0.1%, 0.5%, 1% • Dynamic traffic model: Poisson

  12. Performance Evaluation Integer Linear Programming (ILP),IEEE SECON 2005 Load-Aware Channel Assignment (LACA), WCNC 2005 MOBIHOC 2005

  13. Performance Evaluation ILP LACA

  14. Conclusion • We show how the inputnetwork topology for the channel assignment algorithm affectsseveral key factors that influence the network capacity • network connectivity • radio utilization • channel diversity • quality ofactive links • We propose an algorithm for constructing efficientinput network topologies for arbitrary channel assignmentalgorithms to increase the capacity gain due to multiplechannels.

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