Cooperative WLAN Protocols for Multimedia Communication

Azadeh Ettefagh

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Azadeh Ettefagh, Cooperative WLAN Protocols for Multimedia Communication (2011), Logos Verlag, Berlin, ISBN: 9783832598884

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Beschreibung / Abstract

The IEEE 802.11n specifies MIMO techniques to enhance data rate in WLANs. However, it can support only MIMO point-to-point links. On the other hand, it is known that multiuser MIMO techniques can significantly increase the spectral efficiency of networks. In this thesis, to realise MIMO spatial multiplexing gain in networks with single-antenna stations and to enhance network performance, cooperative protocols are considered with respect to both PHY and MAC layers.

In order to utilise cooperative signalling in WLANs, the MAC protocol has to be modified. The existing CSMA/CA-based MAC avoids any interference and supports only point-to-point links. To enhance IEEE 802.11n system in a way that multiple users can transmit simultaneously, a novel cluster-based CSMA/CA has been proposed in this work. Our study has shown that the CB-CSMA/CA can significantly improve throughput and reduce delay in different types of infrastructure or ad hoc networks with single-hop or two-hop links. Furthermore, we have shown that throughput of CB-CSMA/CA can further be improved by taking cross-layer parameters into account, when forming the clusters or defining the backoff models.

Inhaltsverzeichnis

  • BEGINN
  • 1 Introduction
  • 1.1 Motivation
  • 1.2 State-of-the-Art, Contributions and Outline
  • 2 Basics of Existing WLANs
  • 2.1 IEEE 802.11
  • 2.2 WINDECT
  • 2.3 Summary
  • 3 Multimedia Traffic over WLANs
  • 3.1 Fundamental Bounds and QoS Limitations
  • 3.2 Relaying Scenarios
  • 3.3 Summary
  • 4 Representative PHY Layer Cooperative Protocols
  • 4.1 Multiuser Single-Hop Transmissions
  • 4.2 Multiuser DF Relaying
  • 4.3 Two-Way Relaying
  • 4.4 Multiuser Zero-Forcing Relaying
  • 4.5 Summary
  • 5 A Novel Cooperative MAC Protocol
  • 5.1 Cluster-Based CSMA/CA for Cooperative Wireless Networks
  • 5.2 Outline of Representative CB-CSMA/CA Applications
  • 5.3 CB-CSMA/CA Throughput and Delay Investigation
  • 5.4 Summary
  • 6 Network Performance of CB-CSMA/CA
  • 6.1 Application-Specific Parameters
  • 6.2 Outage Probability
  • 6.3 Collision Probability
  • 6.4 Throughput
  • 6.5 Delay
  • 6.6 Summary
  • 7 Cross-Layer Enhancements of CB-CSMA/CA
  • 7.1 Impact of Backoff Procedure on CB-CSMA/CA Performance
  • 7.2 Impact of Clustering on CB-CSMA/CA Performance
  • 7.3 Summary
  • 8 Performance Bounds of CB-CSMA/CA
  • 8.1 Impact of Event-Synchronisation Errors on CB-CSMA/CA Performance
  • 8.2 Comparison with the Multipacket Reception Protocol
  • 8.3 Summary
  • 9 Outlook for Multihop Communications
  • 9.1 Conceptual Discussion
  • 9.2 A Specific Proposal
  • 9.3 Summary
  • 10 Summary and Conclusion

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