Enhancing NGN's versatility for Multi-Service support: The Bridging Virtualization approach
ABSTRACT Since the appearance of next generation networks (NGN), access and aggregation networks (even core networks) have suffered significant improvements and architectural evolutions. The idea of network convergence, something in which providers are very interested, is closely related with these deployments, as the same network must be capable of transporting all the existent telecommunication services (voice, video and data). This paper introduces an architectural model which is based on broadband forum technical recommendations for multi-service (TR-058), and makes use bridging technology in all the nodes. In this model, carrier-class Ethernet has been selected as transport technology in order to achieve convergence in provider networks. Then, a radically new approach for network convergence is presented, bridging virtualization. This approach introduces the concept of instances to differentiate service requests. Finally, a secure alternative to the instantiation of multiple services is presented (EAPOL-in-EAPOL).
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ABSTRACT: In the last few years, the evaluation of large scale applications across mobile wireless networks has raised a crucial challenge to the research community. Simulation modeling methods can be quite powerful in gaining insight into the behavior of complex systems. The main advantages of simulation modeling include the ability to evaluate scenarios not easily achievable through empirical methods (i.e. scalability testing of networks) and the ability to modify models to test system sensitivity and tune performance. Another important application of simulation modeling techniques is to perform meaningful comparative studies of different technologies, protocols, or new implementations to determine which communication technology performs better from the QoS point of view in a specific scenario. Simulation modeling is a crucial step in the design, development, test and evaluation of any network implementation or strategy, providing the necessary support to the usual demand for “what if” analysis and studies in the network environment. This chapter describes a taxonomy of the different simulation techniques available in the market, introduces statistical concepts for validating the results of a simulation study and describes case studies illustrating the role of simulation in wireless network design.12/2010: pages 271-293;
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ABSTRACT: Internet has been developing for more than three decades ago. Considering its popularity, ubiquity and scale, it causes immense difficulty for other networks with different architectures to be deployed or even get adequately evaluated. This paper introduces a core/edge separation based architecture model, which allows core networks with various architectures to coexist, enables end users to choose whichever core network at will, and simplifies the design, deployment, operation and management of edge networks. In this model, Carrier Grade Ethernet, which is still on-going evolving, is selected as transport technology in the edge networks. A radically new approach called Bridging Virtualization is used to form a convergent access platform to these different core networks for end users. Besides the increasing flexibility for the edge transport carriers, this model also improves end users' independence from the access provider. Moreover, it makes it possible the execution of network convergence step-by-step and can be used to realize it in the edge first. Finally, we apply this architecture model to design the campus networks of Tsinghua University, analyze its pros and cons and make some conclusion.