965 research outputs found
Saving Energy in Mobile Devices for On-Demand Multimedia Streaming -- A Cross-Layer Approach
This paper proposes a novel energy-efficient multimedia delivery system
called EStreamer. First, we study the relationship between buffer size at the
client, burst-shaped TCP-based multimedia traffic, and energy consumption of
wireless network interfaces in smartphones. Based on the study, we design and
implement EStreamer for constant bit rate and rate-adaptive streaming.
EStreamer can improve battery lifetime by 3x, 1.5x and 2x while streaming over
Wi-Fi, 3G and 4G respectively.Comment: Accepted in ACM Transactions on Multimedia Computing, Communications
and Applications (ACM TOMCCAP), November 201
Future broadband access network challenges
Copyright @ 2010 IEEEThe optical and wireless communication systems convergence will activate the potential capacity of photonic technology for providing the expected growth in interactive video, voice communication and data traffic services that are cost effective and a green communication service. The last decade growth of the broadband internet projects the number of active users will grow to over 2 billion globally by the end of 2014. Enabling the abandoned capacity of photonic signal processing is the promising solution for seamless transportation of the future consumer traffic demand. In this paper, the future traffic growth of the internet, wireless worldwide subscribers, and the end-users during the last and next decades is investigated. The challenges of the traditional access networks and Radio over Fiber solution are presented
Business Innovation Strategies to Reduce the Revenue Gap for Wireless Broadband Services
Mobile broadband is increasing rapidly both when it comes to traffic and number of subscriptions. The swift growth of the demand will require substantial capacity expansions. Operators are challenged by the fact that revenues from mobile broadband are limited, just a few per cent of APRU, and thus not compensating for declining voice revenues, creating a so called "revenue gap". Concurrently, mobile broadband dominates the traffic, set to grow strongly. In this paper we analyze the potential of different strategies for operators to reduce or bridge the revenue gap. The main options are to reduce network costs, to increase access prices and to exploit new revenue streams. The focus in the paper is on cost & capacity challenges and solutions in the network domain. Operators can cooperate and share sites and spectrum, which could be combined with off-loading heavy traffic to less costly local networks. In the network analysis we illustrate the cost impacts of different levels of demand, re-use of existing base station sites, sharing of base stations and spectrum and deployment of a denser network. A sensitivity analysis illustrates the impact on total revenues if access prices are increased, whether new types of services generate additional revenues, and if it fills the revenue gap. Our conclusion is that the different technical options to reduce the revenue gap can be linked to business strategies that include cooperation with both other operators as well as with non-telecom actors. Hence, innovations in the business domain enable technical solutions to be better or fully exploited.Wireless Internet access, data traffic, revenues, network costs, spectrum, deployment strategies, HSPA, LTE, operator cooperation, value added services, NFC, B2B2C.
Business models for deployment and operation of femtocell networks; - Are new cooperation strategies needed for mobile operators?
In this paper we discuss different business models for deployment and operation of femtocell networks intended for provisioning of public mobile broad band access services. In these types of business cases the operators use femtocells in order to reduce investments in "more costly" macro networks since the traffic can be "offloaded" to "less costly" femtocell networks. This is in contrast to the many business cases presented in Femtoforum where femtocells mainly are discussed as a solution to improve indoor coverage for voice services in homes and small offices, usually for closed user groups The main question discussed in this paper is if "operators need to consider new forms of cooperation strategies in order to enable large scale deployment of femtocells for public access?" By looking into existing solutions for indoor wireless access services we claim that the answer is both "Yes" and "No". No, since many types of cooperation are already in place for indoor deployment. Yes, because mobile operators need to re-think the femtocell specific business models, from approaches based on singe operator networks to different forms of cooperation involving multi-operator solutions, e.g. roaming and network sharing. --
Real-time HSPA emulator for end-to-edge QoS evaluation in all-IP beyond 3G heterogeneous wireless networks
This paper is aimed at presenting the real-time High Speed
Packet Access (HSPA) emulator that has been developed in
the framework of the AROMA project. Real-time emula-
tors allow reproducing realistic scenarios to test algorithms,
strategies, protocols and applications under realistic condi-
tions. Therefore, real-time emulators constitute a powerful
tool to evaluate the end-user's Quality of Experience (QoE),
which could not be achieved by means of o -line simulations.
The presented emulator is integrated in the AROMA real-
time testbed, which has been developed to provide a frame-
work for demonstrating the bene ts of the common radio re-
source management algorithms as well as the proposed end-
to-edge Quality of Service (QoS) management techniques
developed for all-IP beyond 3G heterogeneous wireless net-
works in the context of the AROMA project. This paper
presents a qualitative description of the developed tool, em-
phasizing some interesting implementation details that may
result helpful in the development of similar emulation plat-
forms. Some illustrative results, showing the capabilities of
the developed tool, are also presented and analyzed.Postprint (published version
Optimization and Performance Analysis of High Speed Mobile Access Networks
The end-to-end performance evaluation of high speed broadband mobile access networks is the main focus of this work. Novel transport network adaptive flow control and enhanced congestion control algorithms are proposed, implemented, tested and validated using a comprehensive High speed packet Access (HSPA) system simulator. The simulation analysis confirms that the aforementioned algorithms are able to provide reliable and guaranteed services for both network operators and end users cost-effectively. Further, two novel analytical models one for congestion control and the other for the combined flow control and congestion control which are based on Markov chains are designed and developed to perform the aforementioned analysis efficiently compared to time consuming detailed system simulations. In addition, the effects of the Long Term Evolution (LTE) transport network (S1and X2 interfaces) on the end user performance are investigated and analysed by introducing a novel comprehensive MAC scheduling scheme and a novel transport service differentiation model
Cost based optimization for strategic mobile radio access network planning using metaheuristics
La evoluciĂłn experimentada por las comunicaciones mĂłviles a lo largo de las Ăşltimas
décadas ha sido motivada por dos factores principales: el surgimiento de nuevas aplicaciones
y necesidades por parte del usuario, asĂ como los avances tecnolĂłgicos. Los
servicios ofrecidos para términales móviles han evolucionado desde el clásico servicio
de voz y mensajes cortos (SMS), a servicios más atractivos y por lo tanto con una
rápida aceptación por parte de usuario final como, video telephony, video streaming,
online gaming, and the internet broadband access (MBAS). Todos estos nuevos servicios
se han convertido en una realidad gracias a los avances técnologicos, avances
tales como nuevas técnicas de acceso al medio compartido, nuevos esquemas de codificiación
y modulaciĂłn de la informaciĂłn intercambiada, sistemas de transmisiĂłn y
recepciĂłn basados en mĂşltiples antenas (MIMO), etc.
Un aspecto importante en esta evoluciĂłn fue la liberaciĂłn del sector a principios de
los años 90, donde la función reguladora llevado a cabo por las autoridades regulatorias
nacionales (NRA) se ha antojado fundamental. Uno de los principales problemas
tratados por la NRA espcĂfica de cada naciĂłn es la determinaciĂłn de los costes por
servicios mayoristas, esto es los servicios entre operadores de servicios mĂłvilles, entre
los que cabe destacar el coste por terminaciĂłn de llamada o de inteconexiĂłn. El
servicio de interconexiĂłn hace posible la comunicaciĂłn de usuarios de diferente operadores,
asĂ como el acceso a la totalidad de servicios, incluso a aquellos no prestados
por un operador en concreto gracias al uso de una red perteneciente a otro operador,
por parte de todos los usuarios.
El objetivo principal de esta tesis es la minimizaciĂłn de los costes de inversiĂłn en
equipamiento de red, lo cual repercute en el establecimiento de las tarifas de interconexiĂłn
como se verá a lo largo de este trabajo. La consecución de dicho objetivo
se divide en dos partes: en primer lugar, el desarrollo de un conjunto de algoritmos
para el dimesionado Ăłptimo de una red de acceso radio (RAN) para un sistema de
comunicaciones móvilles. En segundo lugar, el diseño y aplicación de algoritmos de
optimizaciĂłn para la distribuciĂłn Ăłptima de los servicios sobre el conjunto de tecnologĂas
mĂłviles existentes (OSDP).
El modulo de diseño de red proporciona cuatro algoritmos diferenciados encargados
del dimensionado y planificaciĂłn de la red de acceso mĂłvil. Estos algoritmos se aplican
en un entorno multi-tecnologĂa, considerando sistemas de segunda (2G), tercera
(3G) y cuarta (4G) generaciĂłn, multi-usuario, teniendo en cuenta diferentes perfiles
de usuarios con su respectiva carga de tráfico, y multo-servicio, incluyendo voz, servicios
de datos de baja velocidad (64-144 Kbps), y acceso a internet de banda ancha
mĂłvil.
La segunda parte de la tesis se encarga de distribuir de una manera Ăłptima el conjunto
de servicios sobre las tecnologĂas a desplegar. El objetivo de esta parte es
hacer un uso eficiente de las tecnologĂas existentes reduciendo los costes de inversiĂłn
en equipamiento de red. Esto es posible gracias a las diferencias tecnolĂłgicas existente
entre los diferentes sistemas mĂłviles, que hacen que los sistemas de segunda
generaciĂłn sean adecuados para proporcionar el servicio de voz y mensajerĂa corta,
mientras que redes de tercera generaciĂłn muestran un mejor rendimiento en la transmisiĂłn
de servicios de datos. Por Ăşltimo, el servicio de banda ancha mĂłvil es nativo
de redes de Ăşltima generadĂłn, como High Speed Data Acces (HSPA) y 4G.
Ambos mĂłdulos han sido aplicados a un extenso conjunto de experimentos para el
desarrollo de análisis tecno-económicos tales como el estudio del rendimiento de las
tecnologĂas de HSPA y 4G para la prestaciĂłn del servicio de banda ancha mĂłvil, asĂ
como el análisis de escenarios reales de despliegue para redes 4G que tendrán lugar a
partir del próximo año coinicidiendo con la licitación de las frecuencias en la banda
de 800 MHz. AsĂ mismo, se ha llevado a cabo un estudio sobre el despliegue de redes
de 4G en las bandas de 800 MHz, 1800 MHz y 2600 MHz, comparando los costes
de inversiĂłn obtenidos tras la optimizaciĂłn. En todos los casos se ha demostrado
la mejora, en términos de costes de inversión, obtenida tras la aplicación de ambos
mĂłdulos, posibilitando una reducciĂłn en la determinaciĂłn de los costes de provisiĂłn
de servicios.
Los estudios realizados en esta tesis se centran en la nación de España, sin embargo
todos los algoritmos implementados son aplicables a cualquier otro paĂs europeo,
prueba de ello es que los algoritmos de diseño de red han sido utilizados en diversos
proyectos de regulaciĂłn
Mobile Broadband Expansion Calls for More Spectrum or Base Stations - Analysis of the Value of Spectrum and the Role of Spectrum Aggregation
The breakthrough for mobile broadband is taking the mobile communications industry into a new phase. The number of mobile broadband users in the world exceeds 400 million, and the share of the population in Western Europe with mobile broadband is around 10 per cent and over 15 percent in Austria and Sweden. This development has been propelled by the extensive diffusion of mobile modems (dongles) for laptops and smartphones given users ubiquitous access to mobile internet. Consequently, traffic volumes in the mobile networks have grown immensely, and the mobile data traffic surpassed the mobile voice traffic in the world by the end of 2009, and in for example Sweden, over 75 percent of the mobile traffic is data. --
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