Resource Adaptation for Mobile AV Devices in the UPNP QOS Arcitecture

Distributed multimedia applications increasingly populate Audio-Visual (AV) mobile and desktop devices. Crucial to the success of these applications is the delivery of Quality of Service (QoS) which often refers to resource reservation on devices and network links. Resource reservation is usually ensured by an appropriate admission control (AC) that determines if another request for resources can be granted without interfering already accepted traffic flows and processing resources. If an AC cannot be processed or cannot grant the requested resources, proactive measures like resource adaptation may control the resource requirements of particular flows. Resource adaptation adjusts the resource demands of the application according to the available resources. This paper presents a flexible and hybrid resource adaptation framework for multimedia applications that is incorporated into the UPnP QoS architecture. Furthermore, a simple methodology for controlling resource adaptation in mobile networks and devices is presented. An implementation of resource adaptation proves that the resource utilization is optimized and the QoS can be effectively maintained even in overloaded conditions.