Dynamic QoS Provisioning for Ethernet-based Networks
J. Angelopoulos, Konstantinos Kanonakis, Helen Catherine Leligou, Th. Orfanoudakis, Michail Katsigiannis, Theodore E. Simos, George Psihoyios · AIP conference proceedings · 2008
The evolution towards packet‐based access networks and the importance of quality of experience brings the need for access networks that support the offer of a wide range of multimedia services not currently available to the desired extent. Legacy networks based on circuit switching used explicit signalling that travelled to all nodes along the path to book resources before the launce of the media stream. This approach does not scale well and is not in line with the philosophy of packet networks. Still, the need to reserve resources in advance remains since real‐time services have limited if any means of adjusting their rates to the prevailing network conditions and to preserve customer satisfaction the traditional preventive approach that needs accurate estimates of resource needs for the duration of the session is the only option. The paper describes a possible CAC solution based on measuring flows and enriches the network with implicit admission control (without obviating explicit control if available) and can manage resource allocation to protect quality‐demanding services from degradation. The basis is a flow measurement system, which will estimate the traffic load produced by the flow and activate admission control. However, because in most cases these initial indication may well be misleading, it will be cross checked against a database of previously recorded flows per customer interface which can provide long term data on the flows leaving only a few cases that have to be corrected on the fly. The overall product is a self‐learning autonomic system that supports QoS in the access network for services that do not communicate with the network layer such as, for example, peer‐to‐peer real‐time multimedia applications.