TITRE Adaptive Packet Video Streaming Over IP Networks - LaBRI

Chapter 5
5 A Dynamic Packet Video Marking
Algorithm for IP Differentiated Services
The current unprecedented growth of multimedia streams in the Internet creates new
challenges and concerns in the research communities. Providing scalable QoS while maintaining
fairness and optimal network resource management are key challenges for the future Internet.
Successful deployment of networked multimedia systems depends significantly on the ability of the
management infrastructure to be scalable, dynamic and adaptive. In the other hand, rich multimedia
is increasingly being incorporated into IP applications (like Voice-over-IP, streaming video,
videoconferencing, etc.). However, more work is needed to evolve IP and the underlying
networking technologies into an infrastructure capable of supporting all-service and all-media
traffic. This is why there is a great need to use enabling protocols and services to manage
multimedia networks and services. In order to response these questions, we have designed an
algorithm that provides automatic and accurate mapping between the MPEG-4 Application-Level
QoS metrics and the underlying transport and network QoS mechanisms such as IP Diffserv, this
algorithm can be implemented on the media server or deployed / deported on the edge router. This
chapter is organized as follows:
• Section 5.2 presents a static Diffserv marking algorithm that provides different level
of quality of service to MPEG-4 streams in a Diffserv network.
• Section 5.3 present a mechanism for installing, configuring and managing multimedia
stream over a Diffserv domain. The Diffserv domain is governed by a policy decision
point which facilitates the management of the domain, and allows a dynamic packet
video marking.
5.1 Related Work
Recent works on IP Quality of Service (QoS) Management led to the development and
standardization of enhanced protocols and services. The IETF has defined the Policy-based
Network Management (PBNM) architecture to configure network services. Currently most efforts
are focused on Differentiated Services (Diffserv) in the Internet. The goal of the policy-based
network management is to enable network control and management on a high abstraction level by
defining configuration rules called policies. Policies specify how a network node must be
configured in vendor-independent, interoperable and scalable manner.
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