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  • 1.
    Devlic, Alisa
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Kamaraju, Pavan
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Tollmar, Konrad
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    QoE-aware optimization for video delivery and storage2015In: 2015 IEEE 16th International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM) 2015, Boston, MA, USA, 2015, p. 1-10Conference paper (Refereed)
    Abstract [en]

    The explosive growth of Over-the-top (OTT) online video strains capacity of operators’ networks, which severely threatens video quality perceived by end users. Since video is very bandwidth consuming, its distribution costs are becoming too high to scale with network investments that are required to support the increasing bandwidth demand. Content providers and operators are searching for solutions to reduce this video traffic load, without degrading their customers’ perceived Quality ofExperience (QoE). This paper proposes a method that can programmatically optimize video content for desired QoE accordingto perceptual video quality and device display properties, while achieving bandwidth and storage savings for content providers, operators, and end users. The preliminary results obtained with Samsung Galaxy S3 phone show that up to 60% savings can be achieved by optimizing movies without compromising the perceptible video quality, and up to 70% for perceptible, but not annoying video quality difference. Tailoring video optimization to individual user perception can provide seamless QoE delivery across all users, with a low overhead (i.e., 10%) required to achieve this goal. Finally, two applications of video optimization: QoE-aware delivery and storage, are proposed and examined.

  • 2.
    Devlic, Alisa
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Kamaraju, Pavan
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Tollmar, Konrad
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Towards QoE-aware adaptive video streaming2016In: 2015 IEEE 23rd International Symposium on Quality of Service (IWQoS), IEEE, 2016, p. 75-76, article id 7404713Conference paper (Refereed)
    Abstract [en]

    This paper describes a novel QoE-aware adaptive video streaming method that enhances the viewing experience on mobile devices and reduces cellular network bandwidth consumed by Dynamic Adaptive Streaming over HTTP (DASH) by considering perceptual video quality and data rate channel conditions in the bitrate adaptation process. By streaming an optimized video for the particular video quality and channel conditions toa mobile device, we can improve the worst video qualities causedby DASH streaming and reduce quality variations using fewer number of bits.

  • 3.
    Devlic, Alisa
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Kamaraju, Pavan
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Tollmar, Konrad
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Energy consumption reduction via context-aware mobile video pre-fetching2012In: Proceedings - 2012 IEEE International Symposium on Multimedia, ISM 2012, IEEE , 2012, p. 261-265Conference paper (Refereed)
    Abstract [en]

    The arrival of smartphones and tablets, along with a flat rate mobile Internet pricing model have caused increasing adoption of mobile data services. According to recent studies, video has been the main driver of mobile data consumption, having a higher growth rate than any other mobile application. However, streaming a medium/high quality video files can be an issue in a mobile environment where available capacity needs to be shared among a large number of users. Additionally, the energy consumption in mobile devices increases proportionally with the duration of data transfers, which depend on the download data rates achievable by the device. In this respect, adoption of opportunistic content pre-fetching schemes that exploit times and locations with high data rates to deliver content before a user requests it, has the potential to reduce the energy consumption associated with content delivery and improve the user's quality of experience, by allowing playback of pre-stored content with virtually no perceived interruptions or delays. This paper presents a family of opportunistic content pre-fetching schemes and compares their performance to standard on-demand access to content. By adopting a simulation approach on experimental data, collected with monitoring software installed in mobile terminals, we show that content pre-fetching can reduce energy consumption of the mobile devices by up to 30% when compared to the on demand download of the same file, with a time window of 1 hour needed to complete the content prepositioning.

  • 4.
    Devlic, Alisa
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Tollmar, Konrad
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Evaluation of energy profiles for mobile video prefetching in generalized stochastic access channels2014In: Mobile and Ubiquitous Systems: Computing, Networking, and Services: 10th International Conference, MOBIQUITOUS 2013, Tokyo, Japan, December 2-4, 2013, Revised Selected Papers, Springer, 2014, p. 209-223Conference paper (Refereed)
    Abstract [en]

    This paper evaluates the energy cost reduction of Over-The-Top mobile video content prefetching in various network conditions. Energy cost reduction is achieved by reducing the time needed to download content over the radio interface by prefetching data on higher data rates, compared to the standard on demand download. To simulate various network conditions and user behavior, a stochastic access channel model was built and validated using the actual user traces. By changing the model parameters, the energy cost reduction of prefetching in different channel settings was determined, identifying regions in which prefetching is likely to deliver the largest energy gains. The results demonstrate that the largest gains (up to 70%) can be obtained for data rates with strong correlation and low noise variation. Additionally, based on statistical properties of data rates, such as peak-to-mean and average data rate, prefetching strategy can be devised enabling the highest energy cost reduction that can be obtained using the proposed prefetching scheme.

  • 5. Dornbush, Sandor
    et al.
    English, Jesse
    Oates, Tim
    Segall, Zary
    University of Maryland, Baltimore County.
    Joshi, Anumpam
    XPod: A Human Activity Aware Learning Mobile Music Player2007In: Proceedings of the Workshop on Ambient Intelligence, 20th International Joint Conference on Artificial Intelligence, 2007Conference paper (Refereed)
    Abstract [en]

    The XPod system, presented in this paper, aimsto integrate awareness of human activity and musicalpreferences to produce an adaptive systemthat plays the contextually correct music. TheXPod project introduces a “smart” music playerthat learns its user’s preferences and activity, andtailors its music selections accordingly. We are usinga BodyMedia device that has been shown to accuratelymeasure a user’s physiological state. Thedevice is able to monitor a number of variables todetermine its user’s levels of activity, motion andphysical state so that it may predict what music isappropriate at that point. The XPod user trains theplayer to understand what music is preferred andunder what conditions. After training, the XPod,using various machine-learning techniques, is ableto predict the desirability of a song, given the user’sphysical state.

  • 6. Jang, Y. M.
    et al.
    Reali, G.
    Toh, C. K.
    Segall, Zary
    KTH.
    Fujii, T.
    Message from organizing chair2017Conference paper (Refereed)
  • 7. Jang, Y. M.
    et al.
    Toh, C. K.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Anderst-Kotsis, G.
    Message from Organizing Chairs2016In: 8th International Conference on Ubiquitous and Future Networks, ICUFN 2016, ISSN 2165-8528, Vol. 2016-August, article id 7536920Article in journal (Refereed)
  • 8. Jeong, S. -H
    et al.
    Fujii, T.
    Heo, J.
    Segall, Zary
    KTH.
    Becvar, Z.
    Message from Organizing Chairs2018In: 10th International Conference on Ubiquitous and Future Networks, ICUFN 2018, ISSN 2165-8528, Vol. 2018-July, p. 7-8, article id 8437016Article in journal (Refereed)
  • 9. Jeong, S. -H
    et al.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Wu, F.
    Foreword by Guest Editors for the Special Issue on the 2015 ICUFN (Ubiquitous and Future Networks)2017In: Wireless personal communications, ISSN 0929-6212, E-ISSN 1572-834X, Vol. 93, no 4, p. 877-881Article in journal (Refereed)
  • 10. Kamaraju, P.
    et al.
    Lungaro, P.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    QoE aware video content adaptation and delivery2016In: WoWMoM 2016 - 17th International Symposium on a World of Wireless, Mobile and Multimedia Networks, IEEE conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    The explosion of traffic associated with video content poses significant challenges for mobile content provision. While, on the one hand, mobile video traffic surge is forecast-ed to require significant investments in bandwidth acquisition and infrastructure dimensioning and roll-out, on the other hand, users are not likely to be willing to pay significantly more than today. This increases the pressure to develop solutions capable of making the mobile provision of video more affordable without either affecting user experience or limiting usage. In this respect, this paper proposes a novel methodology for video content delivery which is based on a user video quality perception model. According to this scheme, the video quality of each scene in a movie is selected, from among a finite set of available qualities, with the purpose of reducing the overall bandwidth required to attain a given user experience level targeted by the system for each user and each video. This novel methodology also adopts a clustering approach to identify users with similar Quality of Experience (QoE) profiles and leverages this information for improving the accuracy of user perceived quality predictions. This approach has been validated through a crowd-sourced subjective test evaluation performed with real users using a novel method involving the Amazon Mechanical Turk platform. The results showed that the proposed method is capable of achieving a prediction accuracy in the order of ±0.5 MOS points. This approach can be effectively used to select the video qualities minimizing bandwidth costs while delivering predefined level of perceived quality to the end users.

  • 11.
    Kamaraju, Pavan
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    A novel paradigm for context-aware content pre-fetching in mobile networks2013In: 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE Communications Society, 2013, p. 4534-4539Conference paper (Refereed)
    Abstract [en]

    The current content provision methods and associated pricing and business models are challenged by the traffic requirements anticipated for future 'data intensive' services. In order to deliver substantially higher peak rates operators will need to deploy a much denser infrastructure and/or acquire more spectrum, thus significantly increasing their CAPEX and OPEX and reducing revenues. To improve the utilization of available network resources this paper presents ActiveCast, a disruptive content delivery paradigm that supports opportunistic content pre-fetching by introducing semantic and context awareness in the currently 'agnostic' networking paradigm. The experimental investigations presented in the paper focus on mobile video provision and a content provider, integrated with Facebook and YouTube, has been developed and used to identify socially relevant content for a set of test users. Part of the studies presented in the paper aim at experimentally understanding the structure of the energy costs associated with pre-fetching and on defining a delivery strategy that allows controlling the amount of energy invested. A comparison between a centralized implementation, in which pre-fetching is coordinated by the mobile operators, and an Over-The-Top (OTT) implementation of ActiveCast are also presented. The results show that complementing the context information available at individual user terminals with traffic information, shared by mobile operators through the ActiveCast API, can substantially reduce the energy costs of content delivery, as compared with 'on demand' video streaming. Additionally, opportunistically exploiting connections with WiFi APs can amplify the gains already achievable by prefetching on wide area networks.

  • 12. Kumar, Pavan
    et al.
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Nandakumar, Vikrant
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    A novel experimental framework to investigate context-aware solutions for opportunistic M2M content delivery2011Conference paper (Refereed)
  • 13.
    Lungaro, Pietro
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Application-centric Content Delivery Schemes for Future Wireless Networks2011In: 2011 IEEE 22nd International Symposium On Personal Indoor And Mobile Radio Communications (PIMRC), New York: IEEE , 2011, p. 2128-2132Conference paper (Refereed)
    Abstract [en]

    The apps paradigm is rapidly changing the way in which content is transferred and consumed in mobile networks. Currently, the traffic loads generated by apps are mostly provided as Over-The-Top (OTT) services, essentially transparent to the cellular network operators, while some of the content is delivered and updated in user terminals through "background transmissions", without user intervention. With increasing traffic volumes, associated to richer content and more advanced devices, the apps paradigm might create severe system inefficiencies. In this paper we explore a number of apps based content delivery methods and investigate their performances on multiple relevant dimensions,such as: terminal energy consumption, time for accessing in-apps content and their impact on the user experience associated with other mobile data services. The proposed methods include opportunistic content pre-fetching and are characterized by different degrees of context-awareness. One approach considers only context information at the individual user terminals, while another one includes network context information and assumes that content distribution coordination is performed by the network operators. The results show that when one is increasing the numbers of apps, whose content needs to be simultaneously maintained updated, only the operator-driven approach can be feasible, mainly from an energetic perspective. However, for a small number of maintained apps, pre-fetching schemes are superior to standard "on-demand" content delivery solutions, suggesting that pre-fetching should be limited only to the subset of terminal apps with higher user access probabilities.

  • 14.
    Lungaro, Pietro
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Zander, Jens
    KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    ActiveCast - a network and user aware mobile content delivery system2010In: Ubiquitous and Future Networks (ICUFN), 2010 Second International Conference on, IEEE , 2010, p. 309-313Conference paper (Refereed)
    Abstract [en]

    Most of the currently deployed networks are typically dimensioned considering the "peak hour" traffic demand. Opportunistically utilizing these "excess" resources might be an effective way for improving utilization and lowering the "production" costs. This paper is proposing and evaluating a novel concept, called ActiveCast, and the corresponding architecture for a network and user behavior aware mobile content delivery system. When considering real traffic measurements in urban scenarios we showed that the concept improves the resource utilization and allows serving significantly more users in a pre-existing network. Even with moderate amounts of reliable context information, ActiveCast have been shown to drastically improving both user quality of experience perception and network efficiency, as compared to conventional on-demand content delivery schemes.

  • 15.
    Lungaro, Pietro
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Zander, Jens
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Context-aware RRM for opportunistic content delivery in cellular networks2010In: 3rd Int. Conf. on Communication Theory, Reliability, and Quality of Service, CTRQ 2010, Includes MOPAS 2010: 1st Int. Conf. on Models and Ontology-Based Design of Protocols, Architecture and Services, 2010, p. 175-180Conference paper (Refereed)
    Abstract [en]

    To opportunistically exploit excess resources avail-able at different times and locations we propose in this paperto include context aware information in the RRM schemesadopted in cellular networks. Both an user and a network centricapproaches to content pre-fetching are described and evaluatedfor different network dimensioning and service scenarios. Theobtained results show that for different levels of accuracyin predicting future content requests, operator controlled pre-fetching outperforms the user controlled approach, and that theformer can also bring robustness and significant cost reductionas compared to “classical” RRM schemes: the achieved level ofperformances can be mapped into a tri-dimensional gain regionwhere fewer BSs are needed, or more users can be served, orlarger files delivered per user, while maintaining a given levelof user-perceived service quality. Finally, considering also thedeployment of content caches at the BSs we show that the impactof backhaul limitations on experienced delays can be furthermitigated, when there are similar content interests among users.

  • 16.
    Lungaro, Pietro
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Zander, Jens
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    ContextShift: a Model for EfficientDelivery of Content in MobileNetworks2010In: Wireless Communications & Networking Conference, 2010Conference paper (Refereed)
    Abstract [en]

    A context aware model for delivery of content inmobile networks is introduced and studied through simulation.The model is based on predictive knowledge of mobile userand mobile group behavior. The predictive behavior is relatedto consumption of mobile content on smart mobile terminals.The model proposes to change the time and the location ofthe delivery of predicted content consumption to optimize thewireless network utilization and to improve the user experience.Different content delivery strategies, considering pre-fetchingat the user terminals, caching at the base stations and multi-cast wireless transmissions are proposed and investigated. Thesimulation results show substantial gains in the content deliveryefficiency of cellular networks and improved user perceivedquality for a number of realistic network operation regimes.

  • 17.
    Lungaro, Pietro
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Zander, Jens
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Predictive and Context-based Multimedia Content Delivery inFuture Cellular Networks2010In: 2010 IEEE 71ST VEHICULAR TECHNOLOGY CONFERENCE, 2010Conference paper (Refereed)
    Abstract [en]

    A context aware model for the delivery of contentin mobile networks is presented and studied through simulation.The proposed model is based on predictive knowledge of mobileuser behavior related to consumption of content on smartterminals. Content prediction is here exploited to change the timeand the location of content delivery, opportunistically utilizing theinstantaneously available excess of resources in the network. Thisis anticipated both to increase network utilization and to enhanceuser perceived service quality. However, since the accuracy of thecontext information, and associated content predictions, mighthave a significant impact on performances, our investigationshave been accounting for different content prediction capabilitiesas well as for various degrees of similarity in users’ contentrequests. The obtained results show that substantial gains bothin terms of wireless network efficiency and improved user serviceperception can be achieved, as compared to classical contentdelivery methods, for a number of realistic scenarios.

  • 18.
    Lungaro, Pietro
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Viedma, Cristobal
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Kumar, Pavan
    An experimental framework to investigate context-aware schemes for content delivery2011Conference paper (Refereed)
    Abstract [en]

    A novel experimental approach for investigating the performances of context-aware content delivery schemes is presented in this paper. An innovative testbed, capable of remotely controlling multiple terminals, injecting a wide range of traffic loads in real networks and monitoring different performance measures has been developed and utilized for quantifying both the energy costs and user perceived service quality associated with different context- aware content pre-fetching schemes. In the implementation proposed in this paper, the context information required for performing content pre-fetching is extracted and utilized by individual user terminals and does not require any support from mobile operators. The performances of pre-fetching are compared to those of an on-demand content delivery scheme, for both video streaming and file downloading services. The results shows that not only pre-fetching can increase user service appreciation by reducing the time needed to access the information, but it can also significantly lower the amount of energy consumed in user terminals for retrieving the content. Our experiments further indicate that in order to achieve these additional energy gains only limited content prediction capabilities are required, thus making pre-fetching a solid candidate for the provision of a wide range of content types and services in both wide and local area networks.

  • 19.
    Martinez Ballesteros, Luis Guillermo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Cavdar, Cicek
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Towards a Semantic-aware Radio Resource Management2013In: MOBILITY 2013, The Third International Conference on Mobile Services, Resources, and Users: Proceedings of The Third International Conference on Mobile Services, Resources, and Users, 2013, p. 16-19Conference paper (Refereed)
    Abstract [en]

    In this paper semantic-aware model for radio resource management in wireless networks is introduced and studied through simulation. By semantic-awareness, the network can selectively manage the radio resource allocation based on the evaluation of transferred content, and its associated processing, and prioritize users that are close to experience interruptions, in order to improve the wireless resource utilization and the user’s Quality of Experience (QoE). Different radio resource management (RRM) strategies are proposed and investigated, considering buffer capacity at the terminals and the experience of the users in time while watching a video and waiting for resource allocation. The simulation results show that the users can reduce the total duration, frequency and length of the interruptions during a playback by applying semantic-awareness in the radio resource allocation, which might affect positively user’s QoE.

  • 20.
    Martinez Ballesteros, Luis Guillermo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Impact of semantic-aware radio resource management schemes on video streaming service2012In: Wireless and Mobile Computing, Networking and Communications (WiMob), 2012 IEEE 8th International Conference on, IEEE , 2012, p. 831-836Conference paper (Refereed)
    Abstract [en]

    Current wireless networks have no knowledge on the type and characteristics of the specific mobile services and contents they are providing (they are agnostic). On the other hand, associated to richer content and more advanced devices, improvement of Quality of Experience (QoE) levels perceived by each user looks as one of the main goals of the different actors in the telecommunication's ecosystem. In this respect, network awareness of the transferred content types and their quality requirements can be important to deliver them fulfilling user requirements while optimizing the utilization of network resources. In this paper, we explore the effect of including semantic knowledge in the radio resource management (RRM) schemes of cellular systems as a way to reach this balance for video streaming service. To make this possible, we propose a number of semantic-aware RRM schemes using information about the video playback's current status, and investigate their performances based on the reduction of the total time of interruptions (TTI) perceived by users when a video streaming content is played. The achieved results are compared to those of the standard agnostic scheme implemented in the cellular networks. The outcomes show that incorporating semantic-aware RRM schemes, more users can receive the content provided by a network within a tolerable level of TTI, while the number of users receiving High Definition (HD) videos can be increased, which in general terms might reduce the investment in infrastructure to fulfill users' requirements.

  • 21.
    Martinez Ballesteros, Luis Guillermo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Towards a Novel Resource Management Scheme in Wireless Networks based on Quality of Experience (QoE)2011Conference paper (Refereed)
    Abstract [en]

    This paper summarizes some of the initial research findings obtained in the SERMON project, funded by Wireless@KTH. The main focus of this paper is on video streaming transmission and the quantification of how much can be gained, in terms of user satisfaction and network resource utilization, by exploiting this semantic knowledge at network level. For this purpose, different QoE-centric RRM strategies are proposed and their performances evaluated in respect to a “classical” agnostic scheme, in a scenario where users have different QoE requirements for different content types and as a function of the device screen resolution during a live video streaming transmission.

  • 22.
    Martinez Ballesteros, Luis Guillermo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Quality of Experience and Human-computer Interaction: A Relation Overview2013In: MOBILITY 2013: Proceedings of the Third International Conference on Mobile Services, Resources, and Users, 2013, p. 34-40Conference paper (Refereed)
    Abstract [en]

    This paper first traces the historic evolution of the Quality of Experience (QoE) concept, and then connects common points between the study of user experience as practiced within Human Computer Interaction (HCI) disciplines and recent efforts to understand how user perception can be incorporated into the definition and management of resources in the area of (ICT). After an analysis of the history of QoE and an examination of its current role in HCI, some research challenges are proposed that open doors to future research projects.

  • 23.
    Martinez Ballesteros, Luis Guillermo
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Widaa, Ashraf
    KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    QoE: a market perspective analysis2014In: International Telecommunications Society (ITS) 25th European Regional ITS Conference, Brussels, 22-25 June 2014, 2014Conference paper (Refereed)
    Abstract [en]

    With the development of mobile networks, customer needs and behaviours have changed. Mobile communications means so much more than simple voice communication; there is now mobile Internet with web surfing, videophone, streaming media, and micro blogging. The objective of network optimization has gradually shifted from enhancing network performance to improve quality of experience (QoE). Therefore, assessing and optimizing QoE is the trend for optimizing future mobile networks. Today, users want reliable access for their content, wherever they go in the network. To deliver the best possible experience to mobile broadband subscribers, operators need new ways to assess performance that will enable them to build and manage their networks in the most efficient way. The new paradigmatic eco system (user-interfacenetwork- content) requires novel and disruptive end-to-end considerations in order to enable and sustain the next generation of services and user experience. Thus, the extraordinary adoption of mobile connectivity by end users, and the need for optimized bandwidth management network resource, on the one hand, and the growing interest for good quality content delivery/consumption, is boosting the creation of new network solutions.

  • 24.
    Segall, Zary
    Computer Science and Electrical Engineering Department, University of Maryland Baltimore County.
    Convergent design in ubiquitous computing2009In: 2009 FIRST INTERNATIONAL CONFERENCE ON UBIQUITOUS AND FUTURE NETWORKS, 2009, p. 95-99Conference paper (Refereed)
    Abstract [en]

    Ubiquitous computing and networking have been fertile grounds for innovation while presenting the challenge of realizing a superior user experience and a viable business model. Unassumingly exploring both the difficult task of innovation and the user experience design, this short contribution will briefly document the emergent trend of combining science and engineering with fields of studies that are considered non-science and non-engineering such as design, fashion and visual arts. The thesis of this work is that ubiquitous computing and networking could substantially benefit from such integrative approach.

  • 25.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Semantic Light2006Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    A lighting system for delivering a dynamic, fully customized, and automatic illumination to a subject. The lighting system comprises a programmable light unit for emitting a programmed pattern and spectra of illumination, a sensor pod comprising an array of sensors for detecting ambient lighting conditions and subject characteristics, a control unit for allowing a user to program the lighting system, and a processing unit for analyzing data from the sensor pod and control unit to construct an optimal lighting profile in accordance therewith. The lighting system generates light in accordance with the lighting profile which is fully optimized in spectrum, intensity, color, contrast, temperature, angle, and focus for any given environment, subject and task.

  • 26.
    Segall, Zary
    et al.
    Computer Science and Electrical Engineering Department, University of Maryland.
    Chen, X.Y.
    XV-Pod: An Emotion Aware, Affective Mobile Video Player2009In: 2009 WRI World Congress on Computer Science and Information Engineering, CSIE 2009, 2009, p. 277-281Conference paper (Refereed)
    Abstract [en]

    Today's vast use and frequent uploading of videos on the internet has created a need for a product that would search, select, and recommend videos that would be of interest to the user. Specifically, the video play list will be tailored to the user's emotional mood. In this paper, we proposed XV-Pod, an emotion aware mobile video player that aims to tailor video selection based on a user's emotional mood. In order to select videos that would be best suited to the user, the user's emotional impact of videos was studied through physiological signals collected by BodyMedia SenseWear [2]. We investigated two different approaches on recognizing user's emotional response. In the first approach, we conducted an empirical study to find the emotional intensity change of the user before and after viewing the video. In the second approach, we tried to identify emotions of user by using a decision tree machine-learning algorithm. We discuss the results of both approaches. Finally, we discuss some implications of our findings and future work.

  • 27.
    Segall, Zary
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication: Services and Infrastucture (Closed 20120101), Communication Systems, CoS (closed 2012-01-01). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Eby, Chad
    KTH, School of Information and Communication Technology (ICT), Communication: Services and Infrastucture (Closed 20120101), Communication Systems, CoS (closed 2012-01-01).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication: Services and Infrastucture (Closed 20120101), Communication Systems, CoS (closed 2012-01-01). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Semantic Light2011Conference paper (Refereed)
  • 28.
    Segall, Zary
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Kwak, Kyung Sup
    Foreword by Guest Editors for the Special Issue on the 2011 ICUFN Conference2012In: Wireless personal communications, ISSN 0929-6212, E-ISSN 1572-834X, Vol. 67, no 1, p. 1-3Article in journal (Other academic)
  • 29.
    Segall, Zary
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth. CSEE, University of Maryland, Baltimore County, United States.
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication: Services and Infrastucture (Closed 20120101), Communication Systems, CoS (closed 2012-01-01). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Nandakumar, Vikrant
    Kumar, Pavan
    The Living Laboratory: a Holistic Approach for Understanding the Performance of Future Mobile Services and Networks2011In: 3rd International Conference on Ubiquitous and Future Networks, ICUFN 2011, 2011, p. 300-304Conference paper (Refereed)
    Abstract [en]

    This paper presents the Mobile Services Living Laboratory - a practical approach for evaluating service provision in cellular networks. Our approach promotes an end-to-end view of the system by providing an effective means to store information from both terminal and network sides, together with integrated mechanisms for retrieving feedback on user-perceived service quality. The current implementation of the Living Laboratory is described and evaluated. Further, we show how the Living Laboratory is used to investigate both the effectiveness of context-aware opportunistic content delivery schemes in cellular networks, and the coexistence between M2M and user-generated traffic.

  • 30.
    Yavari, Ali
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Network Efficient Resource Management for Mobile Video Streaming based on Quality of Experience2013In: 2013 International Conference on ICT Convergence (ICTC): , IEEE Communications Society, 2013, p. 654-659Conference paper (Refereed)
    Abstract [en]

    This paper presents a novel experimental approach to quantify the performances of Quality of Experience (QoE)- aware resource management scheme in mobile network. The main goal of this paper is to improve network efficiency by exploiting knowledge of QoE information associated with online video streaming services. The investigations considered in the paper are performed using an innovative test-bed, developed to assess network efficiency for the provision of online video services of different qualities. The QoE model used in the proposed QoEaware allocation scheme assumes a MOS-like grading function whose grades depend on both the duration of playtime interruption and the streaming video quality (resolution). The results show that the proposed resource management scheme can deliver more than 40 percent higher QoE to the users of the system as compared to current agnostic (not aware of QoE requirement and content characteristics) service models.

  • 31.
    Yavari, Ali
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Towards a Semantic-aware Location Positioning for Smart-phones2013In: 2013 Fifth International Conference on Ubiquitous and Future Networks (ICUFN), IEEE conference proceedings, 2013, p. 487-488Conference paper (Refereed)
    Abstract [en]

    Location-aware services and applications have be- come quite popular in the daily life of mobile users. Global Positioning System (GPS) is available in almost all new smart- phones as a mature and accurate positioning technique. GPS as a satellite-based navigation system, determines the current location of users by receiving signals from satellites. Satellite signals cannot propagate properly inside the buildings, which makes it unusable for indoor positioning. In addition, GPS consumes too much energy to be useful for many applications on mobile phones. There are many proposed alternatives for GPS but they are not as accurate. Combination of those alternatives can improve the accuracy, but varies widely depending on the user behavior and environment. This paper presents a novel architecture for semantic-aware positioning that chooses the best positioning method(s) by exploiting the semantic knowledge. 

  • 32.
    Yavari, Ali
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Martinez Ballesteros, Luis Guillermo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Lungaro, Pietro
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Segall, Zary
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Mobile Service Laboratory (MS Lab).
    Quality of Experience-aware Resource Management for Mobile Video StreamingManuscript (preprint) (Other academic)
    Abstract [en]

    In this paper, we present a novel experimental approach to quantify the performances of Quality of Experience (QoE)-aware resource management scheme in mobile networks. The main goal of this paper is to improve network efficiency by exploiting in the resource management the knowledge of QoE information associated with online video streaming services. The investigations considered in the paper are performed using an innovative test-bed, developed to assess network efficiency, as well as the impact on the energy consumption at mobile terminal (MT), for the provision of online video services of different qualities. The QoE model used in the proposed QoE-aware allocation scheme assumes a MOS-like grading function whose grades depend on both the duration of playtime interruption and the video quality (resolution). The results show that the proposed resource management scheme can deliver more than 40 percent higher QoE and energy saving at mobile terminal between 12% to 15% to the users of the system as compared to current agnostic (not aware of QoE requirement and content characteristics) service models.

1 - 32 of 32
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