On Multi-Domain Connection Admission Control in the EuQoS System

This paper describes an approach for performing a Connection Admission Control (CAC) function that is investigated in the EuQoS system designed for providing QoS over a heterogeneous, multi-domain network. The CAC plays a key role in QoS provision since it limits the volume of submitted traffic and, in this way, guarantees the assumed QoS level for transferred packet flows. The CAC algorithms are associated with specific end-to-end Classes of Service (CoS). In the EuQoS system we define a set of CoSs that are supported by the system. Each CoS is designed for transferring data corresponding to given type of applications (as voice, video-conference, high data transfer, video on demand etc.) with assuring appropriate QoS level, expressed in the form of packet loss ratio, mean packet transfer delay and packet delay variation. To cope with multi- domain network, the CAC is performed in many places in the EuQoS system. More specifically, the CAC is distributed horizontally, among the different QoS domains, as well as vertically, among Network Technology Independent (NTI) and Network Technology Dependent (NTD) infrastructures developed by EuQoS. NTD infrastructure allows CAC to interact with the underlying networks, such as WiFi, UMTS, LAN/Ethernet, xDSL, Satellite, and IP.