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Due to their dynamic topologies, providing quality of service (QoS) in wireless ad hoc networks introduces major new challenges to the research community. Now, the commercially available ad-hoc network products are those based on the IEEE802.11 Distributed Coordination Function (DCF). Cooperative communications fully leverages the broadcast nature of the wireless channel and spatial diversity, thereby...
As CMOS technology enters sub-micron era, a large number of intelligent properties (IPs) are integrated on a single chip (SoC). The communication patterns become difficult to model. At the same time, as transistors become small and wires become narrow, delays are becoming more and more unpredictable. The factors greatly challenge traditional on-chip buses and point-to-point interconnects because of...
It becomes a rapidly growing software developing pattern to create new Web services by composition of existing Web services. Since there are lots of Web services that perform similar or identical function but have different quality of service (QoS), it is essential to choose the proper services to compose the composite Web services that meet userspsila requirements. Because manual composition is inefficient,...
Network calculus is a new theory of network QoS which is developed recently, it is the application of the Min-Plus Algebra and Max- Plus Algebra in network analysis. With the aim to resolve the transmitting of the real-time dataflow and get a good performance in dataflow waving ,the network calculus theory is applied to the real-time industrial Ethernet. In the paper ,we gained the real-time arrives...
In wireless sensor networks (WSNs) application we sometimes only require single moment local field information, but traditional periodical all-network information collecting mode consumes much network resources. In order to satisfy Quality of Service (QoS) demands of information collection in wireless sensor networks, prolong network lifetime and minimize control overheads while insuring connectivity,...
Being an evolution of IEEE 802.16e, IEEE 802.16j mobile multi-hop relay (MMR) is proposed to gain coverage extension and throughput enhancement. Although the IEEE standard 802.16j-2006 has not been published yet, the second version of 802.16j Draft Standard (802.16j D2) has been released in 2007. In this paper, for the first time, we evaluate the MAC performance of the Draft Standard based on the...
There are some disadvantage in traditional "special line" networking, IP network, frame relay and the ATM network. A VPN networking project which based on MPLS is put forward in order to solve the problem. Then analyze the realization of MPLS VPN. The simulation principle, simulation process and simulation scenes are introduced by OPNET, get the results that MPLS VPN has lower delay and...
Internet Service Provider (ISP) needs to evaluate change of network congestion level, accordingly takes measures of congestion control to mitigate network congestion and guarantees to provide definite quality of service (QoS) for users. After autonomous system (AS) performance matrix model was introduced, a new path performance metric RL was defined firstly, and then four kinds of scalar quantity...
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...
With the latest semantic annotation specification SAWSDL provided by W3C, web service components were annotated, and annotation process and method were discussed in detail. At the same time, a framework for web services matching and composition was present and its prototype was developed. Service matching algorithms, which were integrated in a service template, were stressed from aspects of function...
The following topics are dealt with: information retrieval; systems security; knowledge structures; processing methods; information theory and statistics; network theory; information hiding and watermarking; quantum information; data compression and coding; pattern recognition and learning; computer graphics and visualization; computer vision and image processing; decision support and expert systems;...
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