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With the spread of real-time streaming services, the problem related to the management of the
network resources appeared. The characteristics of streaming services are different from the typical
data transmissions on the Internet and therefore require other, usually more advanced, methods of
managing network traffic. Software Defined Networks (SDN) is one of the tools that can be used in
this context. SDN is an emerging architecture used to build next-generation networks, specially
fitted to the management of network environments characterised by frequent changes of
transmission conditions. The paper is focused on a video streaming domain and analysis of Quality
of Service (QoS) mechanisms in the SDN. It proposes a solution of fair resource allocation,
compatible with the Server and Network Assisted DASH (SAND) standard. The structure of the
system is described, and results of tests conducted on a testbed are discussed. Also, the parameters
and features of our system have been compared witch well-known techniques of traffic queuing and
network resource allocation. It allowed to generalise the obtained results and link them to typical
real-time streaming scenarios in end-user networks.
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