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The reliability of wireless sensor networks (WSNs) depends on both sensing coverage and reliable transmission of collected data provided by the target cluster of sensors in the proximity of the phenomenon to the observer. In this paper, we establish a probabilistic fundamental quantitative notion for performance-critical applications on reliable information transfer and propose a new analytical model...
Large Service Oriented Architectures (SOAs) have to fulfill qualitative and quantitative requirements. Usually Service Level Agreements (SLAs) are defined to fix the maximal load the system can accept and the minimal performance and dependability requirements the system has to provide. In a complex SOA where services use other services and thus performance and dependability of a service depend on...
Wireless local area network (WLAN) has progressed quickly and found its wide applications recently because of mobility, flexibility, extensible and low cost. WLAN has become very important part of future communication. Quality of service is a hot-point of research about wireless network. Two wireless network loss models, namely random uniformed model and Gilbert-Elliott model, are analyzed. The theoretic...
A trust model for P2P network is proposed in this thesis, namely CRM, a cluster and recommendation based multi-granularity trust model. Compared to the current trust model, some problems can be solved better, for instance, these disadvantages contain great costs due to iterative calculations, and security such as disguise, slandering caused by anonymous and open characteristics of P2P networks. The...
A distributed connection admission control (CAC) scheme where stations independently admit or reject flows based on channel utilization threshold is easy to implement for WLANs. However, owing to variable protocol capacity, the advisable threshold also is variable, limiting the efficacy of fixed threshold based CAC. If the admission threshold is tuned to reflect the current protocol capacity, better...
Feedback data packet flow rate control is one of solutions which have been extensively studied. Monitoring the buffer status is the most used method to increase performance of a queueing system. This mathematical approach is most useful for analysis a multivariable transmission network node. In this research we focus on major problem that need to achieve defined level quality of service. Data packet...
The job scheduling strategy influences the QoS of data grid immediately. This paper firstly summarizes and defines data grid models and the process of job scheduling, simultaneously analyzes the time and cost of job execution in the data grid, then proposes a design proposal of the job scheduling simulator of data grid based on a grid simulator named GridSim, and introduces the architecture, process...
As specified by the third-generation (3G) wireless networks such as the universal mobile telecommunication system (UMTS), interactive data services, such as Web browsing, voice messaging, and file transfer, represent a major service class in operation nowadays. In this paper, we develop an analytical approach to evaluate the performance of interactive data services under sharing and preemptive scheduling...
Information delivery service(IDS) is an important part of Information Grid and with the expansion of network and users, Quality of Service(QoS) has been the basic requirement of IDS. The architecture of Content Delivery Network, the frame of Data Delivery Service and the property of Battle Formation(BF) are firstly analyzed and a battlefield information delivery model is put forward based on BF, which...
Models can help software engineers to reason about design-time decisions before implementing a system. This paper focuses on models that deal with non-functional properties, such as reliability and performance. To build such models, one must rely on numerical estimates of various parameters provided by domain experts or extracted by other similar systems. Unfortunately, estimates are seldom correct...
In the last few years grid computing is evolving into a business-innovating technology that is driving commercial adoption. Such a new scenario calls for powerful strategies able to guarantee stringent QoS requirements in order to meet SLAs between customers and provider. For this reason, it is necessary to analyze and predict performance with respect to different load conditions or management strategies...
This paper provides following three contributions to the study of developing and applying model driven engineering (MDE) techniques to quality of service (QoS) configuration of distributed real-time and embedded (DRE) systems. First, we describe the challenges associated with mapping domain-level QoS policies of DRE systems to middleware configuration space. Second, we discuss a domain specific modeling...
We developed a quality of service (QoS) management system to support service level management (SLM) for global enterprise services. The QoS management system is integrated with one of our enterprise services in a preproduction system, an identical system as the production system but in a test environment. Lab experiments showed that our integrated solution helps global enterprise services to better...
In this paper, we study bandwidth management of a wireless/optical based access/metro network in support of voice and data services. For voice services, we use a finite state Markov Chain to estimate the blocking probability of voice circuits over an Adaptive modulation and coding wireless channel, as a function of the channel parameters. For data services, we evaluate a rate matching and a buffer...
In this paper, the maximal capacity of the data network link has attempted to be exploited by using the dynamic allocation strategy. We propose a new methodology based on the economic models for competing traffic classes (classes of sessions) in packet networks. As the demand for network services accelerates, users' satisfaction to the service level might decrease due to the congestion at the network...
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