David Remondo

Time Series Modeling using Mobile Devices and Broadband Internet

In this paper we present one application included in the Project @DAN, an AdvANced and high secur... more In this paper we present one application included in the Project @DAN, an AdvANced and high secure mobile platform to support the digital economy, that started on November 2001, and is financed by the EU IST-2001-32634. This application will provide all types of services necessary to model and obtain forecasts of time series data by the professionals of any kind

Impact of crosstalk on the performance of an optical cross-connect considering finite extinction ratio

In this paper we investigate the performance degradation in a wavelength division multiplexing ne... more In this paper we investigate the performance degradation in a wavelength division multiplexing network due to crosstalk in optical cross-connects. Worst-case analysis is carried out including in-band crosstalk components. In contrast with the approximate methods in the literature, all beat-noise terms are included, and both input signal hypotheses are considered. The results are obtained by using appropriate importance sampling strategies.

Tutorial on Wireless Ad Hoc Networks

Compared to cellular networks, ad hoc networks are more adaptable to changing traffic demands and... more Compared to cellular networks, ad hoc networks are more adaptable to changing traffic demands and physical conditions. Also, since the attenuation characteristics of wireless media are nonlinear, energy efficiency will be potentially superior and the increased spatial reuse will yield superior capacity and thus spectral efficiency. These characteristics make ad hoc networks attractive for pervasive communications, a concept that is tightly linked to heterogeneous networks and 4G architectures.

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Performance evaluation and parameter optimization of wavelength division multiplexing networks with adaptive importance sampling techniques

IEEE GLOBECOM 1998 (Cat. NO. 98CH36250), 1998

In this paper new adaptive importance sampling techniques are applied to the performance evaluati... more In this paper new adaptive importance sampling techniques are applied to the performance evaluation and parameter optimization of a wavelength division multiplexing (WDM) network impaired by crosstalk in an optical cross-connect. Worst-case analysis is carried out including all the beat noise terms originated by in-band crosstalk. Both input signal hypotheses are considered. The accurate bit-error-rate estimates, which are obtained in short run-times, indicate that the influence of crosstalk is much lower than that predicted by previous analyses. This finding has a strong impact on the design of WDM networks. Besides, a method is used to optimize the detection threshold, which turns out to improve the system performance significantly. The presented techniques also allow us to determine the power penalty due to the introduction of additional WDM channels.

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An interaction model between ad-hoc networks and fixed IP networks for QoS support

Proceedings of the 7th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems - MSWiM '04, 2004

... MC Domingo Telematics Eng. ... 1. INTRODUCTION Several authors have presented proposals to su... more

Quality of Service Support in Wireless Ad Hoc Networks Connected to Fixed DiffServ Domains

Lecture Notes in Computer Science, 2004

This paper analyzes the provision of end-to-end Quality of Service between nodes in a mobile ad h... more This paper analyzes the provision of end-to-end Quality of Service between nodes in a mobile ad hoc network and a fixed IP network that supports Differentiated Services. The ad hoc network incorporates the Stateless Wireless Ad Hoc Networks (SWAN) model to perform admission control for real-time traffic flows. We propose a new protocol, named DS-SWAN (Differentiated Services-SWAN), where end-to-end delays and loss rates of real-time traffic are monitored continuously at the destination nodes in the fixed network and at the edge routers respectively. In this way, nodes in the ad hoc network are warned when congestion is excessive for the correct functioning of a real-time application (specifically, Variable Bit Rate Voice-over-IP), so that the nodes restrain best-effort traffic in order to favour real-time flows. The results indicate that DS-SWAN significantly improves end-to-end delays without starvation of background traffic, adapting itself to changing traffic and network conditions in a relatively small ad hoc network. Besides, we compare different notification procedures in DS-SWAN aimed to improve scalability.

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An Improved Service Differentiation Scheme for VBR VoIP in Ad-Hoc Networks Connected to Wired Networks

Lecture Notes in Computer Science, 2004

We study end-to-end Quality of Service (QoS) support in a mobile ad-hoc network connected to a fi... more We study end-to-end Quality of Service (QoS) support in a mobile ad-hoc network connected to a fixed IP network that uses Differentiated Ser-vices. We propose FA-SWAN (Fast Admission-Stateless Wireless Ad-Hoc Networks), a modified version of the SWAN scheme. SWAN uses local rate control for best-effort traffic and sender-based admission control for real-time traffic. Best-effort flows are delayed by a best-effort

Analysis of VBR VoIP traffic for ad hoc connectivity with a fixed IP network

IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004, 2004

Page 1. Analysis of VBR VoIP Traffic for Ad Hoc Connectivity with a Fixed IP Network MC Domingo a... more

Wireless Ad Hoc Networks: An Overview

Lecture Notes in Computer Science, 2011

This tutorial provides a general view on the research field of ad hoc networks. After a definitio... more This tutorial provides a general view on the research field of ad hoc networks. After a definition of the concept, the discussion concentrates on enabling technologies, including physical and medium access control layers, networking and transport issues. We find discussions on the adequacy of enabling technologies for wireless multihop communication, specifically in the case of the pervasive Bluetooth and IEEE

A simple routing scheme for improving ad hoc network survivability

GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489), 2003

... we modified the DSR protocol and created a new version that is named SEADSR (Simple Energy Aw... more

An Interaction Model and Routing Scheme for QoS Support in Ad Hoc Networks Connected to Fixed Networks

... We have evaluated and compared the performance of a Page 9. 82 MC Domingo and D. Remondo Fig.... more

A cooperation model between ad hoc networks and fixed networks for service differentiation

Proceedings - Conference on Local Computer Networks, LCN, 2004

We propose a new protocol, named DS-SWAN (Differentiated Services-Stateless Wireless Ad Hoc Netwo... more We propose a new protocol, named DS-SWAN (Differentiated Services-Stateless Wireless Ad Hoc Networks), to support end-to-end QoS (Quality of Service) in ad hoc networks connected to fixed DiffServ domains. DS-SWAN warns nodes in the ad hoc network when congestion is excessive for the correct functioning of real-time applications. These nodes react by slowing down best-effort traffic. Simulation results indicate that DS-SWAN significantly improves end-to-end delays for real-time flows without starvation of background traffic.

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A cooperation model and routing protocol for QoS support in ad hoc networks connected to fixed IP networks

Proceedings - Advanced Industrial Conference on Telecommunications/Service Assurance with Partial and Intermittent Resources Conference/E-Learning on Telecommunications Workshop AICT/SAPIR/ELETE 2005, 2005

We propose a new protocol, named DS-SWAN (Differentiated Services-Stateless Wireless Ad Hoc Netwo... more We propose a new protocol, named DS-SWAN (Differentiated Services-Stateless Wireless Ad Hoc Networks), to support end-to-end QoS (Quality of Service) in ad hoc networks connected to fixed DiffServ domains. DS-SWAN warns nodes in the ad hoc network when congestion is excessive for the correct functioning of real-time applications. These nodes react by slowing down best-effort traffic. Furthermore, we present a routing protocol for the ad hoc network, named SD-AODV (Service Differentiation-Ad Hoc On-demand Distance Vector), where new route requests are suppressed at certain nodes to maintain the desired QoS requirements for real-time flows. Simulation results indicate that DS-SWAN and SD-AODV significantly improve end-to-end delays for real-time flows without starvation of background traffic. In this work we also present several versions of the SD-AODV routing protocol and study their behaviour.

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On the Shaping Introduced by IEEE 802.11 Nodes in Long-Range Dependent Traffic

Lecture Notes in Computer Science, 2007

Fractal or scaling phenomena, such as self-similarity and long-range dependence, have been detect... more

On the Mitigation of Long-Range Dependence in IEEE 802.11 Networks

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications, 2006

Several fractal or scaling phenomena, such as self-similarity and long-range dependence, have bee... more Several fractal or scaling phenomena, such as self-similarity and long-range dependence, have been detected in network traffic, with important implications for network performance. In this paper we describe a detailed study that assesses how the characteristics of traffic change when it traverses IEEE 802.11 networks. Various scenarios, including the hidden node situation and the effect of relaying, have been simulated. The simpler scenario has also been replicated in a real testbed, in order to corroborate the results obtained in the simulations. The most significant results are the smoothing effect of the MAC mechanisms on the traffic at the highest frequencies, while at the lowest frequencies we find a mitigation of fractality that seems to be caused by packet loss induced by propagation impairments. The overall effect is a mitigation of fractal characteristics on the output traffic.

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Integration of Optical and Wireless Technologies in the Metro-Access: QoS Support and Mobility Aspects

2009 Next Generation Internet Networks, 2009

Future metropolitan and access networks are expected to comprise heterogeneous optical and broadb... more Future metropolitan and access networks are expected to comprise heterogeneous optical and broadband wireless technologies. The growing demand of users for transparent, ubiquitous access to diverse communication services poses several challenges. We envision a future metro-access architecture that comprises Optical Burst Switching networks that feed Ethernet Passive Optical Networks (PON) or upcoming Wavelength-Division Multiplexing PON, which in turn feed IEEE 802.16 and IEEE 802.11 nodes. Nodes in the wireless realm may communicate in a multihop fashion, forming mesh networks. To maintain cost and resource efficiency, we propose the introduction of Quality of Service (QoS) proxies at the border between different link technologies. These entities handle QoS requirements and aid to the support of mobility. The architecture requires no modification of the Medium Access Control mechanisms of the different technologies. Index Terms-Optical fiber communication, mobile communication, metropolitan area networks.

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On the feasibility of collaborative green data center ecosystems

by David Remondo and David Rincón

Ad Hoc Networks, 2015

ABSTRACT The increasing awareness of the impact of the IT sector on the environment, together wit... more ABSTRACT The increasing awareness of the impact of the IT sector on the environment, together with economic factors, have fueled many research efforts to reduce the energy expenditure of data centers. Recent work proposes to achieve additional energy savings by exploiting, in concert with customers, services’ workloads and to reduce data centers’ carbon footprints by adopting demand-response mechanisms between data centers and their energy providers. In this paper, we debate about the incentives that customers and data centers should have to adopt such measures and propose a new service type and pricing scheme that is economically attractive and technically realizable. Simulation results based on real measurements confirm that our scheme can achieve additional energy savings while preserving service performance.

Content Distribution over IP: Developments and Challenges

Lecture Notes in Computer Science, 2011

This chapter focuses on the multimedia distribution over Internet IP under the auspices of the No... more This chapter focuses on the multimedia distribution over Internet IP under the auspices of the NoE Euro-NGI research project "Routing in Overlay Networks (ROVER)". The multimedia distribution is supported by several components such as services, content distribution chain, protocols and standards whilst Internet is used for content acquisition, management and delivery as well as an Internet Protocol Television (IPTV) infrastructure with QoS facilities. As the convergence between fixed and mobile services of wide and local area networks is also expected to take place in the home networking, this puts an extra burden on multimedia distribution, which requires the different types of wireless access solutions (e.g., WiMAX). In this context, the ROVER research project adopts the IP Multimedia Subsystem (IMS), which offers a wide range of multimedia services over a single IP infrastructure such as authentication and, for wireless services, roaming capabilities. The research project also considers overlay routing as an alternative solution for content distribution.

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Towards End-to-End QoS in Ad Hoc Networks Connected to Fixed Networks

We evaluate the scalability of a new protocol, named DS-SWAN, designed to support end-to-end QoS ... more We evaluate the scalability of a new protocol, named DS-SWAN, designed to support end-to-end QoS in ad hoc networks connected to fixed networks that use DiffServ. When congestion is excessive for the correct functioning of real-time applications, DS- SWAN determines the source of the problem and, if it is the case, allocates more resources to high priority traffic in the ad hoc network. The analysis includes the scalability with respect to the number of real-time traffic sources and node mobility in addition to the impact of best-effort traffic load. Simulation results show an improvement of end-to-end delays and jitter for real-time flows without starvation of background traffic.

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An interaction model for QoS support in ad hoc networks connected to fixed IP networks

International Journal of Wireless and Mobile Computing, 2010

... Garg, S., Kappes, M. and Trivedi, KS (2002a) Supporting VoIP Traffic in IEEE 802.11 WLAN with... more

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