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Cognitive radio is a promising technique in improving the utilization of wireless spectrum by spectrum sensing. However, conceivable spectrum sensing errors may deteriorate the quality of service provided for users. In this paper, we propose a framework to analyze the per-user throughput of both primary users and secondary users. Based on this framework, we further estimate how sensing errors influence...
In wireless sensor network (WSN), real-time network applications require good quality-of-service (QoS) guarantees, such as low packet delay and small backlog. Differentiated services (D-iffServ) mechanism is proposed to satisfy the QoS requirements in WSN. The stochastic characteristics need to be considered for the QoS performance analysis of DiffServ-based WSN. However, the existing works merely...
In hybrid wireless network (HWN), delay is always an important parameter to evaluate the QoS performance. Previous works have studied the average delay of all transmitted packets. However, QoS guarantee is commonly provided for a certain data flow. In this paper, a stochastic network calculus (SNC) based approach is proposed to analyze the stochastic end-to-end delay of a data flow through HWN. Linear...
An accurate and comprehensive delay and backlog performance evaluation is crucial for the quality of service (QoS) guarantee in cooperative communication. However, the classical deterministic network calculus and queueing theory is not suitable for the wireless networks due to their inherent random behaviors. For this aim, we employ stochastic network calculus to analyze the Amplify-and-Forward cooperative...
Multimedia sensor network (MSN) has been deployed in many fields owing to its reliability, flexibility and availability of multimedia data. Correspondingly more challenges draw into the QoS guarantee research. In this paper, we establish a comprehensive performance analytical framework for MSN considering both the traffic self-similarity and stochastic service curve of MSN with S-MAC protocol based...
There are kinds of Internet applications such as VoIP, online gaming and video Conferencing which need quality of service guarantees making the performance analysis critical, and the traffic of such applications usually exhibits the properties of self-similarity and heavy tail. In this paper, we use the generalized Stochastically Bounded Burstiness model to characterize the network traffic with self-similar...
In resource-limited wireless sensor networks(WSNs), network resource will run out soon due to communication of mass redundant data. We employ Network Coding as an effective in-network processing strategy to reduce the data transmission amount. With this concern, a comprehensive Network-Calculusbased analytical framework for Cluster-tree WSNs involving network coding is established in this paper. To...
Inspired by the idea of cross-layer analysis and Network Calculus theory, an analytical model for wireless network, which combines the essential knowledge of both, is proposed in this paper by mapping the characteristic of network layer, link layer and physical layer into concatenation of a sequence of Network Calculus components. In addition, the effect of terminal mobility has been considered in...
In this paper, a method of automatic composition based on pi-calculus for semantic Web service has been presented to improve the automation composition of semantic Web service. First, the formal model of the semantic Web service composition based on pi-calculus is represented, and eight kinds of basic Web service composition patterns in service model of OWL-S are provided. These patterns can be utilized...
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