20 research outputs found
Optimal configuration of active and backup servers for augmented reality cooperative games
Interactive applications as online games and mobile devices have become more and more popular in recent years. From their combination, new and interesting cooperative services could be generated. For instance, gamers endowed with Augmented Reality (AR) visors connected as wireless nodes in an ad-hoc network, can interact with each other while immersed in the game. To enable this vision, we discuss here a hybrid architecture enabling game play in ad-hoc mode instead of the traditional client-server setting. In our architecture, one of the player nodes also acts as the server of the game, whereas other backup server nodes are ready to become active servers in case of disconnection of the network i.e. due to low energy level of the currently active server. This allows to have a longer gaming session before incurring in disconnections or energy exhaustion. In this context, the server election strategy with the aim of maximizing network lifetime is not so straightforward. To this end, we have hence analyzed this issue through a Mixed Integer Linear Programming (MILP) model and both numerical and simulation-based analysis shows that the backup servers solution fulfills its design objective
Interaktive latenzkritische Anwendungen in mobilen Ad-hoc Netzen
In this thesis we discuss the challenges that latency-sensitive interactive applications face in mobile ad-hoc networks. By using multi-player games as an example, we argue that the traditional client-server architecture is unsuitable for this new environment. We consequently create a novel communication architecture as well as quality of service mechanisms that can support the network requirements of such applications in mobile environments. By using a number of distributed zone servers that are selected and managed dynamically by our server selection algorithm, we provide a scalable approach that offers the necessary redundancy. Furthermore, we propose additional quality of service mechanisms to reduce latency and packet loss for interactive applications. We evaluate our approach through network simulation and realistic mobile gaming scenarios. The performance of our evaluation is checked against real-world measurements.In dieser Arbeit werden die Probleme und Herausforderungen von latenz-kritischen interactiven Computeranwendungen in mobilen Ad-hoc Netzen untersucht. Am Beispiel von Mehrbenutzercomputerspielen zeigen wir, dass traditionelle Client-Server Architekturen für diese neuen Umgebungen ungeeignet sind. Im Rahmen dieser Arbeit wird daher eine neue Kommunikationsarchitektur sowie verschiedene Mechanismen zur Erhöhung der Dienstgüte vorgeschlagen. Mit Hilfe von Zonenserver, die durch den Serverauswahlalgorithmus ausgesucht und verwaltet werden zeigen wir einen Ansatz auf, der sowohl bezüglich der Netzgröße skalierbar ist als auch die notwendige Redundanz bereitstellt. Wir zeigen die Funktionalität und die Leistung unseres Ansatzes mit Hilfe von Netzsimulationen bei denen realistische Szenarien für mobiles Spielen simuliert werden. Der hierbei benutze Netzsimulator wurde dafür auf Basis von eigenen Messungen verbessert und für das jeweilige Szenario passend eingestellt
Use case scenarios and preliminary reference model
This document provides the starting point for the development of dependability solutions in the HIDENETS project with the following contents: (1) A conceptual framework is defined that contains the relevant terminology, threats and general requirements. This framework is a HIDENETS relevant subset of existing state-of-the-art views in the scientific dependability community. Furthermore, the dependability framework contains a first list of relevant functionalities in the communication and middleware level, which will act as input for the architectural discussions in HIDENETS work packages (WPs) 2 and 3. (2) A set of 17 applications with HIDENETS relevance is identified and their corresponding dependability requirements are derived. These applications belong mostly to the class of car-tocar and car-to-infrastructure services and have been selected due to their different types of dependability needs. (3) The applications have been grouped in six HIDENETS use cases, each consisting of a set of applications. The use cases will be the basis for the development of the dependability solutions in all other WPs. Together with a description of each use-case, application-specific architectural aspects are identified and corresponding failure modes and challenges are listed. (4) The business impact of dependability solutions for these use cases is analysed. (5) A preliminary definition of a HIDENETS reference model is provided, which contains highlevel architectural assumptions. This HIDENETS reference model will be further developed in the course of the HIDENETS projects in close cooperation with the other WPs, which is the reason why the preliminary version also contains a collection of potential contributions from other WPs that shall be developed and investigated in the course of the HIDENETS project. In summary, the identified use-cases and their requirements clearly show the large number of dependability related challenges. First steps towards technical solutions have been made in this report in the preliminary reference model, whereas the other work-packages have started in the meanwhile to develop such solutions further based on 'middleware technology' (WP2), 'communication protocols' (WP3), 'quantitative analysis methodology' (WP4), and 'design and testing methodology' (WP5
Edge Computing for Extreme Reliability and Scalability
The massive number of Internet of Things (IoT) devices and their continuous data collection will lead to a rapid increase in the scale of collected data. Processing all these collected data at the central cloud server is inefficient, and even is unfeasible or unnecessary. Hence, the task of processing the data is pushed to the network edges introducing the concept of Edge Computing. Processing the information closer to the source of data (e.g., on gateways and on edge micro-servers) not only reduces the huge workload of central cloud, also decreases the latency for real-time applications by avoiding the unreliable and unpredictable network latency to communicate with the central cloud
Proceedings of the Third Edition of the Annual Conference on Wireless On-demand Network Systems and Services (WONS 2006)
Ce fichier regroupe en un seul documents l'ensemble des articles accéptés pour la conférences WONS2006/http://citi.insa-lyon.fr/wons2006/index.htmlThis year, 56 papers were submitted. From the Open Call submissions we accepted 16 papers as full papers (up to 12 pages) and 8 papers as short papers (up to 6 pages). All the accepted papers will be presented orally in the Workshop sessions. More precisely, the selected papers have been organized in 7 session: Channel access and scheduling, Energy-aware Protocols, QoS in Mobile Ad-Hoc networks, Multihop Performance Issues, Wireless Internet, Applications and finally Security Issues. The papers (and authors) come from all parts of the world, confirming the international stature of this Workshop. The majority of the contributions are from Europe (France, Germany, Greece, Italy, Netherlands, Norway, Switzerland, UK). However, a significant number is from Australia, Brazil, Canada, Iran, Korea and USA. The proceedings also include two invited papers. We take this opportunity to thank all the authors who submitted their papers to WONS 2006. You helped make this event again a success
Scalable Network Design and Management with Decentralized Software-defined Networking
Network softwarization is among the most significant innovations of computer networks in the last few decades. The lack of uniform and programmable interfaces for network management led to the design of OpenFlow protocol for the university campuses and enterprise networks. This breakthrough coupled with other similar efforts led to an emergence of two complementary but independent paradigms called software-defined networking (SDN) and network function virtualization (NFV). As of this writing, these paradigms are becoming the de-facto norms of wired and wireless networks alike. This dissertation mainly addresses the scalability aspect of SDN for multiple network types. Although centralized control and separation of control and data planes play a pivotal role for ease of network management, these concepts bring in many challenges as well. Scalability is among the most crucial challenges due to the unprecedented growth of computer networks in the past few years. Therefore, we strive to grapple with this problem in diverse networking scenarios and propose novel solutions by harnessing capabilities provided by SDN and other related technologies. Specifically, we present the techniques to deploy SDN at the Internet scale and to extend the concepts of softwarization for mobile access networks and vehicular networks. Multiple optimizations are employed to mitigate latency and other overheads that contribute to achieve performance gains. Additionally, by taking care of sparse connectivity and high mobility, the intrinsic constraints of centralization for wireless ad-hoc networks are addressed in a systematic manner. The state-of-the-art virtualization techniques are coupled with cloud computing methods to exploit the potential of softwarization in general and SDN in particular. Finally, by tapping into the capabilities of machine learning techniques, an SDN-based solution is proposed that inches closer towards the longstanding goal of self-driving networks. Extensive experiments performed on a large-scale testbed corroborates effectiveness of our approaches
Intelligent multimedia flow transmission through heterogeneous networks using cognitive software defined networks
[ES] La presente tesis aborda el problema del encaminamiento en las redes definidas
por software (SDN). Específicamente, aborda el problema del diseño de un protocolo
de encaminamiento basado en inteligencia artificial (AI) para garantizar
la calidad de servicio (QoS) en transmisiones multimedia. En la primera parte
del trabajo, el concepto de SDN es introducido. Su arquitectura, protocolos
y ventajas son comentados. A continuación, el estado del arte es presentado,
donde diversos trabajos acerca de QoS, encaminamiento, SDN y AI son detallados.
En el siguiente capítulo, el controlador SDN, el cual juega un papel central
en la arquitectura propuesta, es presentado. Se detalla el diseño del controlador
y se compara su rendimiento con otro controlador comúnmente utilizado.
Más tarde, se describe las propuestas de encaminamiento. Primero, se aborda
la modificación de un protocolo de encaminamiento tradicional. Esta modificación
tiene como objetivo adaptar el protocolo de encaminamiento tradicional
a las redes SDN, centrado en las transmisiones multimedia. A continuación,
la propuesta final es descrita. Sus mensajes, arquitectura y algoritmos son
mostrados. Referente a la AI, el capítulo 5 detalla el módulo de la arquitectura
que la implementa, junto con los métodos inteligentes usados en la propuesta
de encaminamiento. Además, el algoritmo inteligente de decisión de rutas
es descrito y la propuesta es comparada con el protocolo de encaminamiento
tradicional y con su adaptación a las redes SDN, mostrando un incremento de
la calidad final de la transmisión. Finalmente, se muestra y se describe algunas
aplicaciones basadas en la propuesta. Las aplicaciones son presentadas para
demostrar que la solución presentada en la tesis está diseñada para trabajar
en redes heterogéneas.[CA] La present tesi tracta el problema de l'encaminament en les xarxes definides
per programari (SDN). Específicament, tracta el problema del disseny d'un
protocol d'encaminament basat en intel·ligència artificial (AI) per a garantir
la qualitat de servici (QoS) en les transmissions multimèdia. En la primera
part del treball, s'introdueix les xarxes SDN. Es comenten la seva arquitectura,
els protocols i els avantatges. A continuació, l'estat de l'art és presentat,
on es detellen els diversos treballs al voltant de QoS, encaminament, SDN
i AI. Al següent capítol, el controlador SDN, el qual juga un paper central
a l'arquitectura proposta, és presentat. Es detalla el disseny del controlador
i es compara el seu rendiment amb altre controlador utilitzat comunament.
Més endavant, es descriuen les propostes d'encaminament. Primer, s'aborda
la modificació d'un protocol d'encaminament tradicional. Aquesta modificació
té com a objectiu adaptar el protocol d'encaminament tradicional a les xarxes
SDN, centrat a les transmissions multimèdia. A continuació, la proposta final
és descrita. Els seus missatges, arquitectura i algoritmes són mostrats. Pel
que fa a l'AI, el capítol 5 detalla el mòdul de l'arquitectura que la implementa,
junt amb els mètodes intel·ligents usats en la proposta d'encaminament. A
més a més, l'algoritme intel·ligent de decisió de rutes és descrit i la proposta és
comparada amb el protocol d'encaminament tradicional i amb la seva adaptació
a les xarxes SDN, mostrant un increment de la qualitat final de la transmissió.
Finalment, es mostra i es descriuen algunes aplicacions basades en la proposta.
Les aplicacions són presentades per a demostrar que la solució presentada en
la tesi és dissenyada per a treballar en xarxes heterogènies.[EN] This thesis addresses the problem of routing in Software Defined Networks
(SDN). Specifically, the problem of designing a routing protocol based on Artificial
Intelligence (AI) for ensuring Quality of Service (QoS) in multimedia
transmissions. In the first part of the work, SDN is introduced. Its architecture,
protocols and advantages are discussed. Then, the state of the art is
presented, where several works regarding QoS, routing, SDN and AI are detailed.
In the next chapter, the SDN controller, which plays the central role
in the proposed architecture, is presented. The design of the controller is detailed
and its performance compared to another common controller. Later, the
routing proposals are described. First, a modification of a traditional routing
protocol is discussed. This modification intends to adapt a traditional routing
protocol to SDN, focused on multimedia transmissions. Then, the final proposal
is described. Its messages, architecture and algorithms are depicted. As
regards AI, chapter 5 details the module of the architecture that implements
it, along with all the intelligent methods used in the routing proposal. Furthermore,
the intelligent route decision algorithm is described and the final
proposal is compared to the traditional routing protocol and its adaptation to
SDN, showing an increment of the end quality of the transmission. Finally,
some applications based on the routing proposal are described. The applications
are presented to demonstrate that the proposed solution can work with
heterogeneous networks.Rego Máñez, A. (2020). Intelligent multimedia flow transmission through heterogeneous networks using cognitive software defined networks [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/160483TESI
Cloud Services Brokerage for Mobile Ubiquitous Computing
Recently, companies are adopting Mobile Cloud Computing (MCC) to efficiently deliver enterprise services to users (or consumers) on their personalized devices. MCC is the facilitation of mobile devices (e.g., smartphones, tablets, notebooks, and smart watches) to access virtualized services such as software applications, servers, storage, and network services over the Internet. With the advancement and diversity of the mobile landscape, there has been a growing trend in consumer attitude where a single user owns multiple mobile devices. This paradigm of supporting a single user or consumer to access multiple services from n-devices is referred to as the Ubiquitous Cloud Computing (UCC) or the Personal Cloud Computing.
In the UCC era, consumers expect to have application and data consistency across their multiple devices and in real time. However, this expectation can be hindered by the intermittent loss of connectivity in wireless networks, user mobility, and peak load demands.
Hence, this dissertation presents an architectural framework called, Cloud Services Brokerage for Mobile
Ubiquitous Cloud Computing (CSB-UCC), which ensures soft real-time and reliable services consumption on multiple devices of users. The CSB-UCC acts as an application middleware broker that connects the n-devices of users to the multi-cloud services. The designed system determines the multi-cloud services based on the user's subscriptions and the n-devices are determined through device registration on the broker. The preliminary evaluations of the designed system shows that the following are achieved: 1) high scalability through the adoption of a distributed architecture of the brokerage service, 2) providing soft real-time application synchronization for consistent user experience through an enhanced mobile-to-cloud proximity-based access technique, 3) reliable error recovery from system failure through transactional services re-assignment to active nodes, and 4) transparent audit trail through access-level and context-centric provenance