Contributions to Mechanisms for Adaptive Use of Mobile Network Resources

Abstract : With the widespread availability of multiple wireless network technologies, mobile computing devices can benefit from almost uninterrupted connectivity by changing network attachments as they move. This however raises the problem of the selection method to be used for the choice of the wireless networks to associate with, in order to provide the best performance. Moreover, mobility events may result in poor application quality, due to either a disruption in connectivity during the handover or the heterogeneity of the characteristic of different access networks. To address these problems, we introduce in this thesis all three elements (observation, decision, action) of a control framework to enable better use of available network resources. We first introduce a decision mechanism which directly considers the relevant user- and application-centric metrics, rather than using the common network metrics-based indirect approach. This mechanism is used to control the entire network stack of the mobile node in a coordinated way, rather than individual components, to avoid potentially conflicting combinations. Our results suggest that, by exploiting the flexibility of application parameters, it is possible to maintain high application quality while reducing both the power consumption and access price. As an action element addressing the disruption in connectivity resulting from the mobility events, we introduce a mobility-aware extension to the TCP-Friendly Rate Control mechanism (TFRC). We propose to suspend the transmission before disconnections and to probe the network after reconnections. Simulations demonstrate how this enables faster recovery after disconnected periods as well as significantly improved adjustments to the newly available network conditions. When used with the Datagram Congestion Control Protocol (DCCP), experiments show that it provides better support for real-time applications for which the user-perceived quality is very dependent on the immediate transmission rate. Finally, we propose to use the OMF Measurement Library (OML), a lightweight instrumentation and reporting tool, as the observation element of our framework. To evaluate the validity of this proposal, we study the performance of OML. We show that it does not significantly impact the performance of the instrumented applications, while accurately reporting the observed metrics.
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Theses
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https://pastel.archives-ouvertes.fr/pastel-00711154
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Submitted on : Friday, June 22, 2012 - 3:19:38 PM
Last modification on : Monday, November 12, 2018 - 10:55:26 AM
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  • HAL Id : pastel-00711154, version 1

Citation

Olivier Mehani. Contributions to Mechanisms for Adaptive Use of Mobile Network Resources. Automatic. École Nationale Supérieure des Mines de Paris; University of New South Wales - Australie, 2011. English. ⟨NNT : 2011ENMP0096⟩. ⟨pastel-00711154⟩

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