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The service-oriented paradigm offers support for engineering service-based systems based on service composition. QoS (Quality of Service)-aware service composition chooses a set of services to collectively construct a service-based system, while satisfying global QoS constraints and budget restriction. The service providers naturally are self-interested and strive to maximize their own utilities....
An important issue in QoS-aware Web service composition is how to select a set of Web services to perform the tasks within a requested service while meeting global QoS constraints. We consider the Web services are self-interested and will use dynamic pricing strategy. In general, the service cost is the minimum price acceptable to a Web service. We can obtain a composite Web service with the maximum...
Due to the imprecision and immeasurability of the user's feeling, the search for proper expression of a user's satisfaction function (USF) in multi-media network is challenging. In this article, we propose fuzzy logic as an effective means of meeting these challenges. First, we introduce a new Fuzzy Satisfaction Factor (FSF) from a collective set of fuzzified Quality of Service (QoS) parameters that...
This paper addresses the problem of perceptual quality measurement on individual coded video frames with distortions caused by both lossy source coding and lossy transmission. We focus on low bitrate H.264 coded video with error concealment and propagation due to packet losses. Identifying human visual system (HVS) masking effect as one of the most important factors affecting the perceptual quality,...
The lossy nature of wireless communication leads to many challenges while designing multihop networks. As an integral part of reliable communication in wireless networks, effective link estimation is essential for routing protocols. Recent studies have shown that link reliability-based metrics like ETX have better performance than traditional metrics such as hop count or latency. Usually, such metrics...
Built on the basis of the classified subscribe station (SS) priorities, a policy-based call admission control scheme is proposed to maximize the system bandwidth throughput and decrease the network delay at the base station(BS) in IEEE 802.16d system. In the simulation, we use throughput comparison and the delay increasing trend as the evaluating criterions. The simulation results show that our proposed...
This paper proposes a new cellular network architecture that simultaneously employs reuse partitioning and fixed relay nodes. Several key issues of the proposed architecture, e.g., the placing positions of relay nodes and the assignments of available carriers, are addressed with theoretic analysis and computer simulations. Our studies show that in comparison with the conventional cellular network...
Radio resource allocation is important in the relay enhanced cellular network. Some smart radio resource allocation schemes have been proposed, such as the "pre-configured and fixed" scheme (H. Hu et al., 2004). In this paper, we propose a new scheme by introducing reuse partitioning into the cellular network with fixed two-hop relay nodes. Theoretical analysis and simulation results show...
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