Contracted QoS Research Articles

Service differentiation economic models and analysis of market-based QoS interconnections

Technical and regulatory changes motivate the economics of the interconnections to be re-examined for the next-generation Internet. This paper presents a framework for the economics of market-based QoS interconnection networks. The economic model presented captures the characteristics of opportunity costs and demands and suggests strategies for QoS pricing and allocation. We use the statistical results of network simulation to present numerical examples of those market opportunity costs with respect to the contracted QoS network services. Using the model, we show the network economics of market-based QoS interconnections.

Admission control for providing QoS in DiffServ IP networks: the TEQUILA approach

Admission control is a key component for QoS delivery in IP networks because it determines the extent to which network resources are utilized and whether the contracted QoS characteristics are actually delivered. Unlike most of the existing approaches, we adopt a holistic view and position the admission control in a unified architecture, where traffic engineering and service management interact in different levels of abstraction and timescale. Distinguishing between service subscription and invocation epochs, the applied admission logic is based on a feedback model, the operation of which can be tuned by operational policies and business strategies. The validity of the approach is supported by a scalability analysis while it has also been verified by a prototype system.

QoS management with dynamic bearer selection schemes

This paper presents an evaluation of a radio level QoS management scheme developed to ensure the maintenance of QoS contracts. The concept of QoS contract is defined as the specification of the quality requirement for various types of services. According to the contracted QoS, a dynamic bearer selection is performed to adapt the link to the channel quality variations. Terrestrial Trunked Radio system (TETRA) presents itself as a suitable platform for illustrating the concept of QoS contract. This arises from its feature-rich bearer services that support data and voice with varying levels of error protection. The generic QoS management scheme presented in this paper has been applied to a private mobile radio system but it also represents an appropriate platform for multi-vendor, multi-technology and multimedia environments such as those found with 3G systems.