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In this work we propose a system to efficiently broadcast large files at maximum Wi-Fi transmission speed over an ad-hoc network using Fountain codes. With this type of rateless encoding we were able to avoid the feedback channel from the receivers and the need to retransmit the lost packets. This way it is possible to take advantage of the full bandwidth of the channel to transmit useful data. To...
Access networks are continuously evolving to increase the bandwidth to their users. In order to be able to offer more than 100Mbps per user, Next Generation Optical Access (NGOA) Networks are being considered. These architectures offer new advantages, not only higher bandwidth per user but also a significant increase of client count (hundreds per port) as well as an increase of the reach which promises...
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 stochastic traffic demands, which guarantees the overload...
A current trend for telecommunication operators is to move services from network level to application level and to realize these services on platforms. A typical example of such platform is the one dedicated to IP Multimedia Subsystem (IMS) services. In order to assess and to improve the Quality of Service (QoS) level, it is necessary to implement a strategy through relevant measurements sent by network...
In this work a mixed integer optimization linear programming (MILP) model was applied to mixed line rate (MLR) IP over WDM and IP over OTN over WDM (with and without OTN grooming) networks, with aim to reduce network energy consumption. Energy-aware and energy-aware & short-path routing techniques were used. Simulations were made based on a real network topology as well as on forecasts of traffic...
An analysis of the energy savings is presented when taking into account a complete traffic model for a one-year time period. Daily and weekly traffic fluctuations as well as yearly traffic growth are considered when analyzing the power consumption. Low power mode in optoelectronic devices (sleep-mode and rate adaptive capabilities) is implemented within a traffic-aware networking approach. The impact...
In this paper we present the way of saving electrical energy in high-tech telecommunication and computer networks. To achieve this aim, the work focuses on the description of the current state and the future trends of changes, as well as it analyses the possibility of energy-saving solutions based on the Clos switching network architectures used in switching networks. A simulation program has been...
The talk concentrates on recent advances in development of the Wi-Fi technology, together with new areas of deployment and new applications. Wireless solutions offering real mobility have changed the way people work, learn, play, and communicate with each other. The productivity and convenience of mobility continuously create new expectations. New wireless LANs should support more mobile devices,...
Network function virtualization (NFV) and multilayer software-defined networking (SDN) will enable an automated control, management and orchestration of network resources across several network layers and areas. They may also open new possibilities for communication service providers (CSP) to expand their business and offer cloud services with carrier-level service-level agreements (SLA). In this...
While new FTTH-PON technologies: 10 Gb/s (XG-PON1, 10G EPON), 40 Gb/s (NG-PON2) and WDM-PON are being developed and standardized, deployments remain limited to older GPON and EPON systems. This is because 10 Gb/s equipment is considerably more expensive, while access network segment is price-sensitive and heavily regulated. Large scale adoption of 10 Gb/s systems may ultimately happen, but for now...
One important requirement associated with the deployment of large scale classification infrastructures is the portability of classifiers, which allows a small number of pre-trained classifiers to be used on many sites and time periods. The portability can be severely degraded if the flow features used in the classification process lack stability, i.e. if they do not preserve their most relevant statistical...
An all-optical networking solution for building a wide area network has been recently proposed. The solution is based on the idea of grouping electronic edge nodes into source and destination clusters and interconnecting these clusters in the optical domain by associating one wavelength channel to each source-destination cluster pair. In this paper, we propose a procedure that allows to build node...
In this work we present a mathematical optimization model for planning the deployment of fast internet technology in a local exchange area. The locations of the new multi-service access nodes (MSANs) and the connections between these nodes and the main distribution frame (hub) are planned simultaneously. Additionally, the connection of several classical nodes to the new MSAN locations via dedicated...
Although several data rate adaptation mechanisms are available for Wi-Fi networks, the same is not true for vehicular networks and its IEEE 802.11p standard. In this paper, we study and evaluate the Wi-Fi available rate adaptation mechanisms in vehicular scenarios to understand their behaviour and analyse their performance under different conditions, in both urban and highway scenarios. The performance...
Currently there is an effort by system operators to deploy cost effective Passive Optical Networks (PON). In this way, next generation PON is the subject of studies by researchers and system designers. Among them, Wavelength Division Multiplexing on Passive Optical Network (WDM-PON) are of particular interest once they can provide larger bandwidths. This work presents a new kind of Optical Network...
Online Social Networks became a relevant part of daily digital interactions for more than half a billion users around the world. The various personal information sharing practices that social network providers promote have led to their success as innovative social interaction platforms. At the same time, these practices have risen much critique and concerns with respect to privacy and security from...
We analyze and compare through network simulation the performance of medium range optical networks in mesh topology, operating in OPS/OBS modes under various link loads. The basic parameters network latency (delay), average number of hops (ANH) and packet loss fraction (PLF), are used as performance metrics. Based on node connectivity, a direct comparison can be established between these parameters...
In this paper the rearrangeable nonblocking conditions for the MBA(N, e, 2) switching fabric were described. The cost of the new switching network, calculated as the number of active and passive optical elements, was presented as well. This cost was compared also with the cost of the typical baseline switching fabric of the same capacity. When the size of optical switching elements grows, the new...
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