A middleware for service adaptation in differentiated 802.11 wireless networks
Proceedings. 2004 12th IEEE International Conference on Networks (ICON 2004) (IEEE Cat. No.04EX955)
Currently there is a growing interest to support Quality of ServicNQoS) for multimedia application delivery over bandwidth limited aud varying wireless network. Existiug work either ouly focus at network level QoS via MAC scheduling or provide application level QoS via per-application admission control. Due to the lack of application information, the former may not meet the specific QoS requirements of different applications, while the latter res& in poor scalability. In light of the
... t of the limitations of existing approaches, we present a novel QoS architecture, which incorporates a iwo-level design. At the network level, the cross-layer scheduling and queue management provide service diflerentiation for wireless network. At the middleware level, a monitor maintains a global view of the application performance over the whole network, and an adaptor coordinates service odapration to achieve the required QoS for multimedia applications. In this paper, we present the whole QoS architecture, with a focus on the middleware design, which adopts a control-based adaptation model. To validate our design, applications with different QoS requirements are built on top of the middleware. Experimental results show that, the specific QoS levels for multimedia applications can he successfully achieved in IEEE 802.11-based wireless environment.