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Identifier

000408035

Title

SDN - based application - network collaboration for low-latency networked music performance systems

Alternative Title

Συνεργασία SDN δικτύων – εφαρμογής για την πραγματοποίηση δικτυακών μουσικών παραστάσεων χαμηλής καθυστέρησης

Author

Λακιωτάκης, Εμμανουήλ Μ.

Thesis advisor

Δημητρόπουλος, Ξενοφώντας

Reviewer

Τσακαλίδης, Παναγιώτης
Μούχταρης, Αθανάσιος

Abstract

A class of network services that attracts the interest of the research community is ultra delay-sensitive applications. In this type of services, end-to-end delay is acceptable up to a threshold which is at the level of milliseconds. A representative example of ultra delay-sensitive services is Networked Music Performance (NMP) systems. An NMP involves musicians that are located in different places, who perform music while staying synchronized via the Internet. The maximum end-to-end delay in NMP is called Ensemble Performance Threshold (EPT) and should be less than 25 milliseconds. Due to this constraint, NMP systems require ultra-low delay solutions for audio coding, transmission via the network, relaying and decoding, each one a very challenging task on its own. There are two types of approaches in related work referring to NMP systems. From the perspective of audio, researchers experiment on low-delay encoders and transmission patterns to reduce the required bandwidth and processing delay of audio transmission, but they do not bring network performance into play, treating it as a "black box". On the other hand, network researchers try to find optimal ways for reducing network delay, which contributes to reduced end-to-end delay for NMPs. In this master thesis, the proposed approach introduces an integration of dynamic audio and network modification to satisfy the EPT constraint. The basic idea is that the major components participating in a NMP system, application and network, communicate and interact as the live network music performance event takes place for improved performance. When network delay increases, the network tries to absorb this increase by modifying routing behavior. If network delay exceeds a maximum acceptable threshold, the network reacts by informing the application to change the audio processing pattern to overcome delay increase. This interaction enables end-to-end-delay below the EPT value when otherwise would not be possible. Our implementation incorporates Software Defined Networking, because it increases the flexibility and dynamic adaptation to rapid changes. Also, the implementation exploits the ability of SDN’s central entity called SDN controller that has a global view of the whole network and takes optimal routing decisions. We designed and developed a full prototype of the proposed NMP system, which was successfully evaluated in an emulation environment. The results show that delay improvement is feasible up to 59%.

Language

English

Subject

Collaboration

Δίκτυα καθοριζόμενα από λογισμικό

Συνεργασία εφαρμογής-δικτύου

Issue date

2017-03-17

Collection

School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses

Type of Work--Post-graduate theses

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