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As a kind of effective way to improve the utilization ratio of the spectrum, more and more attention have been paid to the cognitive radio. This paper proposes an improved cognitive radio spectrum sharing model. In this model, the primary users provide idle spectrum to the secondary users. Secondary users have to pay when they share available spectrum with primary users while using the spectrum. The...
Web services composition has become a main measure to create and streamline B2B collaborations within and across organizational boundaries. This paper focuses on the web servi- ces composition and provides a novel selection algorithm based on global QoS optimizing and Chaos Particle Swarm Optimiza- tion(CPSM). Firstly, the web services selection model with QoS global optimization is converted into...
In the Internet, many WS providers offer the same or similar services, and the QoS (quality of service) of WS has become an important method to evaluate and select the services. This paper focuses on providing a new method to rank the web service based on the QoS to get the best available web service. Firstly, the QoS attributes' Independent Components(ICs) are computed to reduce their correlation...
Now the QoS demand is ordinary in network device. This paper introduces some key technology to implementation a QoS scheme in embedded system. Base on the DiffServ, this paper discusses the multilayer data stream module in detail.
To support high bandwidth with high mobility is the predominant objective of next-generation networks. As some networks such as UMTS (universal mobile telecommunication system) can offer a wide geographical coverage with relatively low data rate, while other networks such as WLAN (wireless local area network) can support much higher bandwidth at a local level, network selection is becoming one of...
Traditional security approaches are not sufficient to deal with the protection and survivability of highly distributed information systems operating in unbounded networks. In view of the deficiencies of the essential servicespsila self-recovering when the survivable system is not available, an efficient self-adjusting reconfiguration framework on system survivability is presented based on the service-level...
The broadband access network of EPON can supply high bandwidth to each user. It also can support multicast function well. EPON is the most important access way to vide multicast service. Apply multicast in EPON, multiple users in the same group can share a stream and can improve the efficiency of downstream band. The paper introduces an method to carrying IPTV in EPON.
With the description of the multi-layer switch and QoS principle, we introduce the flow classification technology to implement QoS and put the implementation way and workflow. Then we introduce the experiment steps and the result and give related analysis.
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