T second generation of optical networks with wavelength division multiplexing (WDM) is based on the notion of two layer networks, where the first layer represents a logical topology defined over the physical topology of optical fibers and the second layer represents multiple traffic requests combined (multiplexed) over the paths established in the logical topology. Because the design of both of...

Wireless sensor network (WSN) is composed of a large number of sensor nodes, it can real-time monitor and collect various information of monitored objects and passed to the user for analysis and use. This paper studies and designs a hierarchical WSN network management architecture and communication model, focus on the wireless sensor network topology control mechanism and based on the analysis ...

In the near future, there will be many multicast services, and they will be a large part of tra c in the network. The characteristics of multicast connections are quite di erent from those of point-to-point connections. However, the conventional network topology is designed for point-to-point connection. If we use the conventional network topology for multicast services, the qualities of servic...

A mobile ad hoc network (MANET) is a self-organized and adaptive wireless network formed by dynamically gathering mobile nodes. Since the topology of the network is constantly changing, the issue of routing packets and energy conservation become challenging tasks. In this paper, we propose a cross-layer design that jointly considers routing and topology control taking mobility and interference ...

The paper presents an approach for the topology design of a Hungarian public ATM network on top of the Hungarian SDH network with STM-4 rings on the lower level, and STM-16 mesh on the higher level. The approach is being implemented in the XPLANET tool developed for the support of the network planning activities of the Hungarian Telecommunications Company Ltd. Based on the planning approach the...

Currently, it is possible to modify (say, hourly) the topology of a data communications network by adding or deleting network links and/or by increasing or decreasing bandwidth on existing links in response to changing traffic loads and/or projected network conditions. The intent of this paper is to study a Markov decision process (MDP) model of the dynamic topology problem (DTP), the problem o...

We describe a system for achieving PNNI (Private Network-Network Interface) Global Routing Infrastructure Protection (PGRIP). We give details of PGRIP's system-level design and identify some conditions to rigorously guarantee the distributed fault tolerant detection of anomalies. PGRIP detects integrity compromises of PNNI routing by enforcing rules that characterize topology information update...

Realistic topology generators are essential to the understanding of network design and survivability analysis. Two important issues that are not sufficiently addressed by current topology generators are nodepositioning and cost considerations. We propose that the utility of the existing models could be vastly improved by incorporating these two features. In this paper we introduce a new network...

In this work we describe VIVAGr, a graphicaloriented real time visualization tool for vehicular ad-hoc network connectivity graphs. This tool enables the effective synthesis of structural, topological, and dynamic characteristics of VANET graphs, with a variety of parameters that affect the shape and characteristics of a vehicular ad hoc network (wireless range, mobility models, road-network to...

To my wife Yan, and my parents, for their love, support and encouragement iii ACKNOWLEDGEMENTS My first, and most earnest, acknowledgment must go to my advisor Dr. Mostafa Ammar, who led me into the exciting area of networking and telecommunications. His insights, experience, encouragement, and uncompromising emphasis on quality research guided me through my entire program of study. Much of thi...