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Building an experimental network within the testbed has been a tiresome process for experimenters, due to the complexity of the physical resource assignment and the configuration overhead. Also, the process could not be expedited across testbeds, because the syntax of a configuration file varies depending on specific hardware and software. In this paper, we propose the AnyBed: the experimental network-building...
This demonstration exhibits the novel concepts of autonomic network composition and adaptive media delivery which have been developed as part of the EU framework 6 project ambient networks. A realistic use case serves as a demonstration scenario to illustrate how these core features of an ambient network work together in practice, and how they can contribute to improve the end user's experience in...
In 2005, the creation of the network for the Kyatera project began, with the declared goal of designing the most advanced and innovative research and experimental network of Latin America. This paper describes the groundwork for the development of such network in terms of its requirements, functionalities, provided services, enabled researches and design concepts. Structurally, the Kyatera network...
Wireless networks in combination with image sensors open up a multitude of previously unthinkable sensing applications. Capable tools and testbeds for these wireless image sensor networks can greatly accelerate development of complex, yet efficient algorithms that meet application requirements. In this paper, we introduce WiSNAP, a Matlab-based application development platform intended for wireless...
We have developed several experimental convergence services and a test-bed of TV with IP-based STB (IP_STB) and mobile services. Service operators have been struggling to find killer services that can create or find new service market especially in convergence sector in the current and next broadband networks. But, as you know, it is very difficult to forecast what service will be a killer service...
In Sweden we have a long tradition of research collaboration using open testbeds. With that as background this paper discusses what factors make that type of collaboration successful, respectively what makes it fail (i.e. what are the ingredients to prepare successful testbed collaboration). Particularly in early life-cycle phases, looking for new and perhaps disruptive usages of technology factors...
Today, new ways of constructing and delivering complex wireless and mobile services require more elaborate and distributed prototyping, testing, and validation facilities. Testbeds are becoming an important tool for integrating technology components into the complex environment of the wireless world and end-users in their daily life. However technology in itself is no longer valid-benefits and usefulness...
We present an experimental broadband wireless 4times4 multiple-input multiple-output (MIMO) OFDM system operating at two well-known WLAN frequency bands: 2.4 GHz and 5.2 GHz. The demonstrator is described placing special emphasis, both at the RF and DSP levels, on the design of a reconfigurable hardware architecture. In the RF section, a new scheme for the design of custom, area-efficient multi-antenna...
Broadband applications and fiber loop access constructions are important government policies in Taiwan. A series of related programs such as e-Taiwan, M-Taiwan, were carried out or are on-going. One target of M-Taiwan program is to have 4.2 million FTTx households by year 2010. Ethernet passive optical network (EPON) is the latest fiber loop access technology which has the merits of low-cost, easy-of-use,...
Ad-hoc networking provides a cost-effective support structure for inter-vehicle communication. A decentralized peer-to-peer information dissemination architecture is well suited for automotive applications that need to exchange data having local relevance. Routing, however, is challenge in a vehicular scenario because of the associated dynamism in network topology and variations in driving conditions...
In this paper wireless communication using white, high brightness LEDs (light emitting diodes) is considered. In particular, the use of OFDM (orthogonal frequency division multiplexing) for intensity modulation is investigated. The high peak-to-average ratio (PAR) in OFDM is usually considered a disadvantage in radio frequency transmission systems due to non-linearities of the power amplifier. It...
Rendezvous among experiment entities appear in network experiments both implicitly and explicitly. When the driving system for a network experiment testbed supports such rendezvous, users are free to focus on the content of the experiments, without having to consider details of the rendezvous (conditions, timing, etc.) and their execution. This paper shows typical entity activities in network experiments,...
The lack of a unified control plane does not allow current optical networks to dynamically provision new optical paths. The IETF standardization body has proposed the generalized multi-protocol label switching standard as a solution to this problem. Their efforts however focus on the creation of end-to-end optical trails. This concept is convenient for major service providers, whose network may span...
This paper describes a flexible testbed using a combination of managed switches and rack-mounted personal computers, controlled from a central server distribution point. The arrangements allows for the rapid and automated configuration of various network scenarios. In addition, the use of IP tunnelling allows testbed islands to be interconnected in support of larger distributed arrangements. After...
ENIGMA is a network configuration and management environment that provides end to end QoS (quality of service) across an MPLS transport network for UMTS services. As a result, a new concept of transport network is defined, which links the new trends in IP with the operator's needs. This solution will allow an improvement in the mobile user experience thanks to QoS and traffic engineering provisioning...
Experiments in real satellite testbeds are relatively rare in practice. In this paper, we are going to share our experience on using one, and comment on selected sets of results that we've conducted in such mixed Internet and GEO-Satellite environment. The selected material includes: characterization of an induced error-prone satellite channel; results from an optimized non-congestion losses aware...
WLAN (wireless local area networks) are proliferating wildly, at home, in business, and across the globe in public places. These types of networks are based on devices according to the IEEE 802.11 standard. A main drawback for the nomadic user is that roaming mechanisms for PWLAN have not been standardized. Some organizations have started a definition process in order to standardize a set of open...
In this manuscript, we contribute measurement and modeling results for H.264 encoded videoconference traffic. The analysis of the frame-size autocorrelation function of extensive video data that were gathered during realistic experiments with two popular videoconference terminals (currently the only supporting the H.264 encoder) suggested that H.264 videoconference traffic is fully uncorrelated as...
Network traffic generators allow video and audio streams to be modelled. `Bursty' traffic patterns imply packet-by-packet rather than time-averaged analysis to determine the impact on network routers. Due to computer operating system time event scheduling dependencies, the ability to generate accurate packet delivery is compromised. A real-time operating system on an x86 commodity machine is shown...
Network modelling and traffic characterization are essential research activities towards the optimization of UMTS. We present here our IPv6 Linux-based UTRAN testbed which aims at emulating a real UTRAN segment. This emulation is relying on statistical traffic distributions, random walk UE mobility and line-of-sight power-based handover management. By interconnecting those different modules, we expose...
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