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Mobile Networks and Applications

, Volume 13, Issue 3–4, pp 297–305 | Cite as

Joint Routing and Playout Buffering of IP Telephony Flows in MANETs

  • Fabrizio Boi
  • Luigi Atzori
Article

Abstract

The low-cost of packet-based networking technologies with respect to traditional circuit-switched ones and the reliability of the current (wired) IP networks have brought to a considerable employment of the VoIP (Voice over IP) technologies in the voice services market. This success is expected to happen also in mobile ad hoc networks (MANETs), which may offer a good platform for the fast deployment of VoIP mobile networks. However, efforts must be made to improve performance before MANETs can be used for this purpose. One of the main limitations is related to the highly variability of the network topology and channel behavior, which heavily influences the service quality due to route losses and significant delay variations. In this paper, we propose a strategy where these impairments are jointly addressed. The source is responsible for jointly selecting the transmission paths and adjusting the playout delay, with an adaptive inter-talkspurt approach. These tasks are accomplished on the basis of historical data on network connectivity and transmission delays, and are driven by a quality-based approach. The collection of statistics of the network status relies on the QOLSR routing algorithm, whereas the voice quality is measured by means of the ITU-T E-Model.

Keywords

IP telephony MANET OLSR QOLSR QoS E-model playout buffering 

Notes

Acknowledgments

This research activity is partially supported by the IKNOS project funded by the Italian Ministry of education and research and developed by the University of Cagliari, CNIT and Tiscali.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Electrical and Electronic EngineeringUniversity of CagliariCagliariItaly

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