Phuong Nga Tran

Phuong Nga Tran
Hamburg University of Technology | TUHH

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30
Publications
4,094
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281
Citations

Publications

Publications (30)
Conference Paper
Full-text available
The Limited Relative Error algorithm is an alternative statistical method for data evaluation. Through online result analysis it continuously requests more samples until it deems the evaluation confident enough. With this it allows researchers to hand over the control of simulation time to the algorithm, and through a-priori configuration the targe...
Article
We study the problem of evaluating and improving the robustness of communication networks against earthquake disasters. Earthquakes occur at various geographical locations with different intensities and can disrupt specific parts of the networks. To enhance network robustness, additional links can be installed to reduce the disconnection probabilit...
Article
In this article, we investigate the challenges in designing a communication network robust against earthquake-induced disasters. Due to the heterogeneity of local geology conditions, an earthquake may cause different devastating effects on network links at different locations. Therefore, the aim of this research was to develop a network design meth...
Article
Planning a communication network is a very challenging task, because network traffic is not constant but fluctuates heavily. Overestimating the traffic volume leads to an expensive solution, while underestimating it results in a poor Quality of Service (QoS). In this paper, we propose a new approach to solve the network planning problem under stoch...
Conference Paper
Today's networking hardware (e.g. switches, routers) is typically running 24/7, regardless of the traffic volume. This is because in current networks, the controlling and data forwarding functions are embedded in the same devices, and all L2/L3 network protocols are designed to work in a distributed manner. Therefore, network devices must be switch...
Conference Paper
Optimum utilisation of the transport links in the access networks as well as satisfaction of the end-user service quality (Quality of Experience - QoE) is important for mobile operators. The necessary prerequisites for proper dimensioning (capacity planning) of the access network are careful modeling of the arrival traffic characteristics and prope...
Conference Paper
User mobility can cause severe degradation of QoS, which can be counteracted by performing handovers at the right moment. However, to perform a robust handover is a challenging task. In this paper, we study the handover problem for mobile wireless networks in the of?ce environment, where the users? mobility is predictable. We propose a new mechanis...
Conference Paper
Traffic in communication networks is not constant but fluctuates heavily, which makes the network planning task very challenging. Overestimating the traffic volume results in an expensive solution, while underestimating it leads to a poor Quality of Service (QoS) in the network. In this paper, we propose a new approach to address the network planni...
Conference Paper
Full-text available
Content Centric Networking (CCN) has been recently proposed as a potential candidate for the future Internet architecture. It allows users to focus on the data they are interested in, rather than having to connect to a specific physical host where the data locates. CCN is claimed to inherently support mobility. While this is true for content receiv...
Article
Network Virtualization (NV) offers an efficient usage of resource by sharing the infrastructure with different virtual network operators while deploying new services. However, it also raises new challenges for network operators and researchers [1]. One of the main challenges is the efficient resource allocation, known as virtual network (VN) mappin...
Article
Network Virtualization (NV) has recently been considered as a key feature of the Future Internet because it allows easy transition from existing IPv4 based Internet to new mechanisms and protocols, and a more efficient usage of infrastructure by sharing it with different virtual network operators while deploying new services. However, Network Virtu...
Conference Paper
Full-text available
Network Virtualization is claimed to be a key component of the Future Internet by enabling the coexistence of heterogeneous (virtual) networks on the same physical infrastructure, providing the dynamic creation and support of different networks with different paradigms and mechanisms in the same physical network. A major challenge in the dynamic pr...
Conference Paper
In this paper, we present a novel distributed algorithm to solve the logical topology reconfiguration problem for IP over WDM networks under dynamic traffic. From the optimization model proposed in, we apply the Lagrangian relaxation to eliminate the capacity constraint and form a dual problem whose optimal solution is the lower bound of the origin...
Conference Paper
Full-text available
In WDM all-optical networks, the use of wavelength converters can increase the wavelength resource efficiency and reduce the blocking probability. However, all-optical wavelength converters are likely to remain costly devices. Moreover, the blocking probability does not decrease linearly with the number of converters. Hence, it is desirable that ju...
Article
With the advancements in WDM technology to provide huge capacity and the Internet Protocol playing a dominant role in networking technology, IP-over-WDM network becomes a potential candidate for next generation networks. This article studies the problem of designing logical topologies for IP-over-WDM backbone networks. One important feature of IP-o...
Conference Paper
In this paper, we present a new approach to solve the logical topology reconfiguration problem for IP over WDM networks under dynamic traffic. Based on the measurement of lightpaths' load, a change in the logical topology is made if some lightpath is highly loaded or under utilized. The change can be adding/deleting several lightpaths or just rerou...
Article
Full-text available
We consider the problem of designing logical topologies for IP over WDM networks. One important feature of WDM networks is the reconfigurability when traffic demands change over time. However, if the network resource is not used efficiently, the reconfiguration can cause network disruption because new wavelength channels can be added only after del...
Article
Full-text available
The rapid growth of Internet as well as bandwidth-intensive networking applications such as video-on-demand or multimedia conferencing, raise new challenges in network planning and management, and hence requires extensive new research in high-bandwidth transport networks, of which optical networks employing WDM technology is a promising candidate....

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