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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
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Λακιωτάκης, Εμμανουήλ Μ.
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Thesis advisor
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Δημητρόπουλος, Ξενοφώντας
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Reviewer
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Τσακαλίδης, Παναγιώτης
Μούχταρης, Αθανάσιος
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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%.
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Language |
English |
Subject |
Collaboration |
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Δίκτυα καθοριζόμενα από λογισμικό |
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Συνεργασία εφαρμογής-δικτύου |
Issue date |
2017-03-17 |
Collection
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School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/6/c/d/metadata-dlib-1491305980-163377-5902.tkl
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Views |
702 |