Multicast service with Quality of Service (QoS) guarantees is critical to commercial and real-time applications , such as telemedicine, video-conferencing, and virtual reality. The Internet is currently in the process of developing QoS architectures (e.g., Int-serv, Dii-serv) to support such applications. However, most multicast protocols, such as PIM and CBT, do not employ QoS-sensitive routin...

Quality of Service (Qos) plays a key role in web services. In an open and volatile environment, services may not deliver the Qos they declared. Hence, it is important to provide a Qos assessment model to select the most appropriate service for the user. Although many researches have been done to develop models and techniques to assist users in Qos assessment, most of them ignore various Qos req...

One of the main challenges of the design of object-based Distributed Multimedia Systems is to address the performance related issues such as the Quality of Service (QoS). The specification of QoS is a crucial part of architectural object-based methods such as Open Distributed Processing (ODP). In the ODP, a QoS property assigned to an object is modelled via two clauses of required and provided ...

Quality of Service (QoS) in Mobile Ad hoc Networks (MANETs) is a challenging task because of restricted resource and dynamic configuration. To support QoS, the link state information i.e. bandwidth, delay, cost, jitter, node energy and error rate in the network should be existed and manageable. The concentration of this paper is exploring the scope to QoS routing mechanism, to report the source...

This paper presents an approach for enterprise modelling of complex command and control systems. This approach is based on the use of ODP enterprise language concepts (communities, roles, enterprise objects, policies, and contracts), augmented with enterprise-related Quality of Service (QoS) descriptions. These descriptions are based on the ODP QoS statements, namely QoS capabilities, QoS requi...

In wireless multimedia communication systems, call admission control (CAC) is critical for simultaneously achieving a high resource utilization efficiency and maintaining quality-of-service (QoS) to mobile users. User mobility, heterogeneous nature of multimedia traffic, and limited radio spectrum pose significant challenges to CAC. QoS provisioning to both new calls and handoff calls comes wit...

In this paper, we assess Quality of Services (QoS) requirements in wireless sensor networks (WSNs).QOS is a key component of the IMS. The QoS for a particular session is determined by a number of factors, such as the maximum bandwidth that can be allocated to the user based on the user’s subscription or the current state of the network. The IMS allows operators to control the QoS a user gets, s...

Quality of Service (QoS) management becomes more and more important, especially in networks where many applications are competing for a limited number of resources. As these applications become more complex (consider e.g. multiparty multimedia applications), the number of options for QoS management increases, leading to more complex decision processes. In this paper, we propose an approach for ...

QoS (Quality of Service) support in Web services is an important issue. In this paper, we present a QoScapable web service architecture, QCWS, by introducing a QoS broker module between service clients and providers (servers). The functions of the QoS broker module include collecting QoS information about servers, making selection decisions for clients, and negotiating with servers to get QoS c...

By allowing service calls to be guarded by contexts, Asymmetric Event Structures (AES for short) and contextual nets are a convenient framework to model composite Web services or service orchestrations. We equip AES with QoS domains as a framework to capture a number of QoS metrics and their combination. We use the resulting model to formalize QoS-based late service binding in composite service...