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One of the greatest challenges in the embedded systems area is to empower software developers with tools that speed up the debugging of QoS properties in applications. Typical streaming applications, such as multimedia (audio/video) decoding, fulfill the QoS properties by respecting the real-time deadlines. A perfectly functional application, when missing these deadlines, may lead to cracks in the...
This paper presents a preemption control based bandwidth preserving server approach to improve the quality of service in terms of better responsiveness to the aperiodic task and reduce their rejection ratio while ensuring the feasibility of periodic task at the same time. Feasibility analysis is done at offline by assigning the priority of periodic tasks as well as server to service the aperiodic...
The IEEE 802.16 standard has defined several QoS scheduling types without detailed implementation of the bandwidth scheduling scheme. Since the DL direction is more likely to be bottleneck than the UL direction, in this paper, we propose an improved framework for downlink real-time traffic, which acquire packet information by cross-layer design and dynamic drops the packets according to the network...
The publish/subscribe paradigm matches well with these systems. Data distribution service (DDS) is a publish/subscribe data-centric middleware. It specifies an API designed for enabling real-time data distribution and is well suited for such complex distributed systems and QoS-enabled applications. Unfortunately, the need to transmit a large number of sensor measurements over a network negatively...
Providing a seamless handoff and quality of service (QoS) guarantees is one of the key issues in real-time services. Several IPv6 mobility management schemes have been proposed and can provide uninterrupted service. However, these schemes either have synchronization issues or introduce signaling overhead and high packet loss rate. This paper presents a scheme that reduces the handoff latency based...
Service-oriented architecture (SOA) has become the preferred methodology to build complex enterprise applications. Inside an enterprise, an enterprise service bus (ESB) has emerged as a powerful and flexible solution to have services and applications interact with each other, independently of their location and connectivity requirements. ESBs are implemented with some form of middleware, and messaging...
Current generation of distributed real-time systems requires more flexibility and the ability of changing its behaviour at run time. This paper presents a model and an algorithm for QoS-aware service composition in distributed systems with real-time requirements. This model is applicable in application domains where temporal guarantees and flexibility are needed, such as remote monitoring, control...
The following topics are dealt with: bioinformatics; computer architecture; real time systems; soft computing; database; data mining; geographical information system; security; information assurance; network related simulation; parallel architecture; software engineering; grid computing; image processing; quality of service; network performance evaluation; parallel systems; wireless networks; system...
Real-time transport control protocol (RTCP) is the control protocol of real-time transport protocol (RTP), with responsibilities such as quality of service (QoS) adaptation, implementation, and troubleshooting. Various problems with RTCP have led to alternative designs, one of which is a hierarchical design named scalable-RTCP (S-RTCP). In this article, we explain about the weaknesses associated with...
Scheduling of uplink data by the network typically requires that the buffer status information from each User Equipment (UE) is available at the network to ensure that the air interface resources are not wasted. The presence of delay constrained flows or radio bearers at the UE may impose a constraint that the delay information be available at the network in addition to the size of buffer data. In...
Differentiated services (DiffServ) scheme is good idea to support real-time applications in IP based networks. However, it fails to give the actual way for end user applications to request specific QoS as there is no connection admission control. It is difficulties to assure end-to end QoS in DiffServ networks. In order to overcome the limit of the DiffServ scheme, an approach to perform connection...
According to the feature and inherence request of distributed test and control system real-time communication, the idea of quality of real-time service (QoRS) and index systems was suggested. An abstract math function of QoRS was erected and the real-time message was constrained with the QoRS concrete index. The analysis of instance by the QoRS indicates: the idea of QoRS and index systems could direct...
The Distributed Real-Time Thread is an emergent concept for distributed real-time systems. Distributed Threads are schedulable entities with an end-to-end deadline that transpose nodes, carrying their scheduling context. Mechanisms for predicting the missing of deadlines are fundamental because corrective actions can be incorporated for improving system quality of service. In this work we propose...
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