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Heterogeneous Wireless Access in Large Mesh Networks

Heterogeneous Wireless Access in Large Mesh Networks. Haiping Liu, Xin Liu, Chen-Nee Chuah, Prasant Mohapatra University of California, Davis. IEEE MASS 2008. Outline. Introduction Related Work Theoretical Study Proposed Method Evaluation Conclusion. Introduction .

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Heterogeneous Wireless Access in Large Mesh Networks

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  1. Heterogeneous Wireless Access in Large Mesh Networks Haiping Liu, Xin Liu, Chen-Nee Chuah, Prasant Mohapatra University of California, Davis IEEE MASS 2008

  2. Outline • Introduction • Related Work • Theoretical Study • Proposed Method • Evaluation • Conclusion

  3. Introduction • The Major obstacles of large Wi-Fi mesh network • Multihop transmission • The performance of multihop transmission decreases quickly as the number of hops increases • Link quality • Depending on specific topologies and failure probabilities, the proportion of island nodes may not be negligible. • Distributed • In large mesh networks, centralized MAC-layer schemes, global link transmission scheduling, or synchronization are not practical.

  4. Introduction • The Major obstacles of large WiMAX mesh network • Spatial-reuse • Although the large cover age of WiMAX reduces the number of wireless hops in the network, it cannot support good spatial-reuse of spectrum. • Expensive • WiMAX devices have much higher power consumption and are much more expensive than Wi-Fi devices. • Deployment • Wi-Fi devices have been widely deployed, and there fore it is beneficial to integrate WiMAX networks with existing Wi-Fi network.

  5. Architecture portal WiMAX base station (WMBS) mesh node Customer terminal

  6. Related Work • WiMAX-only mesh network • Cannot fully reuse bandwidth and disregards the widely deployed Wi-Fi device • Wi-Fi/WiMAX • Few of them analyze the major drawbacks of Wi-Fi or WiMAX-only mesh networks, offer theoretical proof of the heterogeneous architecture and publish corresponding solution.

  7. Goal • The paper propose an integrated Wi-Fi / WiMAX architecture that exploits the advantages of both technologies. • The primary objective of this paper is to facilitate a good cooperation of the last two kinds of connections and improve the overall system performance

  8. Theoretical Study – Notation

  9. Theoretical Study – Formulation

  10. Theoretical Study – Environment Set

  11. Theoretical Study – Solution and Analysis

  12. Protocol Design • Although it is shown that a heterogeneous network is a good solution through the theoretical study, it is necessary to design a protocol that can achieve the gain in practice and deal with challenges that are not captured by the idealized model. • We propose a threshold-based protocol and an optimization algorithm

  13. Assumptions • WiMAX utilized the scheduled MAC scheme. • In Wi-Fi networks, nodes utilize IEEE 802.11 MAC instead of the scheduled MAC as in theoretical study. • The WMBSs do not try to control the routing or scheduling inside the Wi-Fi network.

  14. Proposed Protocol – LABHW WMBS Node a TH = 10 Reject / Accept Traffic = 15 Request Conga = 15 > 10 = TH Conga = 5 < 10 = TH Collect Requests from all nodes and run the algorithm. Reclaim BW Update and Broadcast TH Receive and forward Traffic

  15. LABHW Algorithm – Notification

  16. LABHW Algorithm – Formulation WMBS Node i Node j

  17. Evaluation – Environment Set

  18. Evaluation

  19. Evaluation

  20. Evaluation

  21. Evaluation

  22. Evaluation

  23. Conclusion • This paper proposes a heterogeneous network architecture, consisting of Wi-Fi and WiMAX. • To solve the major problems and improve the performance of multihop Wi-Fi mesh networks of large size. • Based on the insights from the theoretical study, we design a practical protocol.

  24. Thank You

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