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Next generation mobile communication is developing towards heterogeneous overlay networks, which provide multiple access patterns for users. Efficient vertical handoff algorithms among different network are required to meet a user's quality of service. In this paper, a vertical handoff algorithm is proposed in which fuzzy logic processing (FLP) is combined with analytic hierarchy process (AHP) for...
A novel multi-relay selection algorithm based on genetic algorithm (GA) in dual-hop decode- and-forward cooperative network is presented. The quality of service is expressed by the condition that the SNR of destination should be larger than 22R -- 1 according to Shannon information capacity, in which R is its data-rate requirement. Moreover, residual energy status parameter of the network using the...
Many SOA applications are now migrating to cloud servers, due to cloud's low cost provision, elasticity for growth, and better availability. Although cloud service providers have implemented reliable management system for their infrastructure, hybrid cloud users often lack easy monitoring and diagnosis facilities to discover the root cause of end-to-end QoS violations. However, the cause must be identified...
With the growth of mobile applications, user context becomes a dynamic but important factor for quality of service (QoS) in the cyber world. Many digital services have distinctly different performance under different service contexts. At runtime, an unexpected transition of user context may cause an application to fail to deliver the required QoS. In this paper, we propose a proactive service selection...
Service flow in SOA systems need to detect quality of service (QoS) problems and to guarantee end-to-end performance. In previous work, we have proposed two faulty service identification methods: a dependency matrix based diagnosis and a Bayesian network based diagnosis. In this paper, we present a hybrid diagnosis to achieve high diagnosis accuracy and low diagnosis cost. The hybrid diagnosis reduces...
Power control is an important component of the resource management strategy in wireless networks to achieve higher utilization and/or better quality of service. In this paper, we present a framework of decentralized power control called trajectory-based power control (TBPC), by setting the SIR target of each wireless station according to some trajectory, which is specified to reflect the corresponding...
The availability of the spectrum opportunity to the secondary users is related to the activity of the frequency channels. In this paper, we research the activity of the channels in opportunistic spectrum sharing. A three-state continuous-time Markov chain is proposed to describe the activity of the channel. A formulation under the service traffics for the model is given and the probabilities of the...
QoS provisioning in wireless mesh networks has been to known as a challenging issue. In a distributed scheduling based wireless mesh backhaul network, conventional connection-based QoS provision mechanism requires considerable amount of overhead for per-link QoS signaling, thus cannot support high speed real time traffic. In this paper,we propose a DiffServ-like QoS provision mechanism for IEEE 802...
When a business process fails to deliver the quality of service (QoS), it is necessary to identify the faulty services that cause the problem. In this paper, we present a framework for diagnosing QoS problems in SOA. A set-covering algorithm is used to select the locations of run-time service data collection, or probes. The framework then creates a dependency matrix to denote the relationships between...
In this paper, we propose a power control algorithm using game theory for cognitive radio networks. A novel framework is presented to meet different SIR constrains which can guarantee the cognitive radio user's QoS requirement. We define a cost function which can effectively control the network power consumption. With the given cost function, the second user can achieve a better performance related...
In SOA, services may become volatile and fail to deliver the quality of service as requested by users. In this paper, we present an approach for repairing failed services by replacing them with new services and ensuring the new service process still meets the user specified end-to-end QoS constraints. An iterative structural inspection algorithm is designed to produce reconfiguration regions that...
One of the challenges in SOA is to provide an efficient and effective way to identify compatible Web service(s) and compose them into a service process that satisfies a userpsilas functional and non-functional needs. Quality of service (QoS), like response time or throughput, might need to be optimized for the selected service process. This paper describes a system architecture and strategies Web...
Using SOA, service processes can be composed statically or dynamically using services provided by different service providers. Some services may become faulty at runtime and cause the service process to violate the end-to-end quality of service (QoS) constraint. We propose an efficient approach for replacing faulty services to ensure that the reconfigured service process still meets the original end-to-end...
The Intelligent Accountability Middleware Architecture (Llama) project supports dependable service-oriented architecture (SOA) monitoring, runtime diagnosis, and reconfiguration. At its core, Llama implements an accountability service bus that users can install on existing service-deployment infrastructures. It collects and monitors service execution data from a key subset of services; enables Llama...
At present, Web applications and HTTP requests on the Internet are so explosively increasing that a large number of hot Web sites frequently confront with problems of server overloading. And how to provide various web services with high-level quality and satisfactory performance for Web clients has become one of the most urgent points we concern. In order to smoothly solve these problems, we proposed...
Adding autonomic capabilities to network management systems provides great promise in delivering high QoS while lowering operation and maintenance cost. In this paper, we present a model-based approach to adding autonomic capabilities to a fault management system for cellular networks. We propose the use of modeling techniques to specify software failures and their dispositions at the model level...
A handoff scheme based on guard channel, queuing and channel preemption (GCQCP) is proposed to guarantee the QoS of handoff traffic in the heterogeneous hierarchical wireless networks. On the basis of bidirectional call-overflow between different networks, guard channels are set for real-time traffic handoffs and buffer queues are set for nonreal-time traffic handoffs. In order to further decrease...
Many researchers propose that, not only functional but also non-functional properties, also known as quality of service (QoS), should be taken into consideration when consumers select services. Consumers need to make prediction on quality of unused web services before selecting. Usually, this prediction is based on other consumers' experiences. Being aware of different QoS experiences of consumers,...
Quality-of-service routing (QoSR) is a challenging NP-hard problem of IPv6 networks. For the sake of satisfying QoS requests of future multimedia applications, a novel LMA (link-utilization-ratio metric based routing Algorithm) is proposed. It takes only a single metric called LUR (link-utilization-ratio) as the link cost, which is advertised suitably by OSPFv3 LSAs of IPv6. It computes routing by...
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