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Proceedings of the 2011 ACM Symposium on Applied computing

作者： Mitra, Karan Zaslavsky, Arkady Åhlund, Christer Center for Distributed Systems and Software Engineering Monash University 900 Dandenong Road Caulfield East VIC 3145 Australia Computer Science and Electrical Engineering Luleå University of Technology SE-97187 Luleå Sweden Division of Mobile Networking and Computing SE-93187 Skellefteå Sweden

ISBN: (纸本)9781450301138

In this paper, we develop a novel context-aware approach for quality of experience (QoE) modeling, reasoning and inferencing in mobile and pervasive computing environments. The proposed model is based upon a state-space approach and Bayesian networks for QoE modeling and reasoning. We further extend this context model to incorporate influence diagrams for efficient QoE inferencing. Our approach accommodates user, device and quality of service (QoS) related context parameters to determine the overall QoE of the user. This helps in user-related media, network and device adaptation. We perform experimentation to validate the proposed approach and the results verify its modeling and inferencing capabilities. © 2011 ACM.

关键词： Bayesian networks

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Multimedia QoE optimized management using prediction and statistical learning

Multimedia QoE optimized management using prediction and sta...

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Conference on Local Computer Networks (LCN)

作者： Muslim Elkotob Daniel Grandlund Karl Andersson Christer Ahlund Division of Mobile Networking and Computing Luleå University of Technology Skelleftea Sweden

We present a scheme for flow management with heterogeneous access technologies available indoors and in a campus network such as GPRS, 3G and Wi-Fi. Statistical learning is used as a key for optimizing a target variable namely video quality of experience (QoE). First we analyze the data using passive measurements to determine relationships between parameters and their impact on the main performance indicator, video Quality of Experience (QoE). The derived weights are used for performing prediction in every discrete time interval of our designed autonomic control loop to know approximately the QoE in the next time interval and perform a switch to another access technology if it yields a better QoE level. This user-perspective performance optimization is in line with operator and service provider goals. QoE performance models for slow vehicular and pedestrian speeds for Wi-Fi and 3G are derived and compared.

关键词： IEEE 802.11 Standards Measurement Quality of service mobile communication Streaming media Statistical learning Jitter

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Bandwidth Efficient Mobility Management for Heterogeneous Wireless Networks

Bandwidth Efficient Mobility Management for Heterogeneous Wi...

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Consumer Communications and networking Conference, CCNC IEEE

作者： Karl Andersson Daniel Granlund Muslim Elkotob Christer Åhlund Division of Mobile Networking and Computing Luleå University of Technology Skelleftea Sweden

An important feature of the upcoming fourth generation wireless networks is support for heterogeneous radio access technologies in combination with an all-IP type of overall architecture. Operators and users will benefit from a smooth technology transition leveraging existing investments and use a variety of access technologies simultaneously. This paper describes and evaluates an innovative mobility management scheme in such an environment. It does not require any changes to the IP stack in the mobile node and does not introduce any additional overhead to the payload traffic over air interfaces. Furthermore, it does not add any signaling overhead and outperforms existing mobility management schemes for heterogeneous environments in terms of bandwidth consumption. The architecture uses a make-before-break principle for vertical handovers and bidirectional tunneling using various tunneling mechanisms connecting mobile nodes through access networks to a home network. Also, it proposes a packet inspection routine for timely handover execution in the home network.

关键词： Bandwidth mobile radio mobility management Wireless networks Tunneling Home automation Investments Payloads Telecommunication traffic Joining processes Inspection

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PRONET: Proactive context-aware support for mobility in heterogeneous access networks

PRONET: Proactive context-aware support for mobility in hete...

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Conference on Local Computer Networks (LCN)

作者： Karan Mitra Arkady Zaslavsky Christer Åhlund Caulfield School of Information Technology Caulfield East Monash University Australia Division of Mobile Networking and Computing Luleå University of Technology Skelleftea Sweden

This paper presents a blueprint for proactive context-aware mobility support architecture for heterogeneous access networks called PRONET. In particular, we leverage upon the principles of cognitive networking to support proactive context-awareness for user-centric application adaptation via quality-of-experience (QoE) provisioning. Our proposed architecture is built upon port-based multi-homed mobile IPv6 (PM-MIPv6) solution to support several applications via path diversity. In this paper our contributions are two-fold. Firstly, we identify and present gaps in our research domain related to mobility, QoE, cognitive networks and cross-layer design. We then present our architecture for providing seamless mobility in heterogeneous access networks. Currently, we are in the process of collecting results via our test bed and prototype implementation for 802.11g and HSDPA wireless networks.

关键词： Wireless networks Quality of service mobile computing Computer networks Computer architecture Cross layer design Multiaccess communication Telecommunication traffic Network interfaces Speech

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Towards context aware adaptation in wireless networks

Towards context aware adaptation in wireless networks

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2nd International Conference on mobile Ubiquitous computing, Systems, Services and Technologies, UBICOMM 2008

作者： Kodikara, Ruwini Åhlund, Christer Zaslavsky, Arkady Centre for Distributed Systems and Software Engineering Monash University 900 Dandenong Road Caulfield East Melbourne VIC 3145 Australia Division of Mobile Networking and Computing Luleå University of Technology 931 87 Skellefteå Sweden

ISBN: (纸本)9780769533674

Next generation ubiquitous computing will comprise of context aware adaptive applications and protocols. There is a need of a generic architecture to cater for the adaptation requirements of increasingly demanding real-time applications and increasing dynamic wireless networks. This paper discusses the adaptive approach supported by CA3RM-Com architecture. CA3RM-Com is the context aware architecture proposed for real-time communication in wireless networks. It addresses the context representation, context acquisition, context exchange, and context management. Specific details of the architecture and referring adaptations that CA3RM-Com can support are discussed. Moreover the extended simulation results of adaptive multi-homed mobile IP are presented in this paper. © 2008 IEEE.

关键词： Wireless networks

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Supporting adaptive real-time mobile communication with multilayer context awareness

IFIP Advances in Information and Communication Technology

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IFIP Advances in Information and Communication Technology 2008年 284卷 435-446页

作者： Kodikara, Ruwini AÅhlund, Christer Zaslavsky, Arkady Centre for Distributed Systems & Software Engineering Monash University Australia Division of Mobile Networking & Computing Luleå University of Technology Sweden

ISBN: (纸本)9780387848389

Real time mobile communication is challenging due to the inherent limitations of mobile networks. On the other hand the stringent quality of service requirements of real time traffic is highly in demand. Our first contribution is the generic context aware architecture for adaptive real time applications. Adaptation is based on the awareness of context parameters from different layers of the existing protocol stack which involves context exchange among the neighboring layers as well as non-neighboring layers. The architecture comprises of context representation, context acquisition, cross-layer context exchange and context management. Our second contribution is the mobility aware, adaptive Multi-homed mobile IP. Simulation of adaptive M-MIP was carried out as a proof of concept. Simulation demonstrated that adaptation to mobility was able to decrease mobile IP handover latency. Further, the results show that the quality of service of real time traffic can be enhanced by using context aware adaptive MIP. The simulation involved with various speeds ranging from pedestrian scenarios to vehicular scenarios. Results are analyzed with variable data rates. The evaluations show that performance of the proposed solution is better compared to conventional MIP in terms of packet loss and throughput of real time traffic. © 2008 IFIP International Federation for Information Processing.

关键词： Quality of service

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Mobility management for highly mobile users and vehicular networks in heterogeneous environments

Mobility management for highly mobile users and vehicular ne...

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Conference on Local Computer Networks (LCN)

作者： Karl Andersson Christer Ahlund Balkrishna Sharma Gukhool Soumaya Cherkaoui Division of Mobile Networking and Computing Luleå University of Technology Skelleftea Sweden Electrical and computer engineering department University of Sherbrooke Canada

With the recent developments in wireless networks, different radio access technologies are used in different places depending on capacity in terms of throughput, cell size, scalability etc. In this context, mobile users, and in particular highly mobile users and vehicular networks, will see an increasing number and variety of wireless access points enabling Internet connectivity. Such a heterogeneous networking environment needs, however, an efficient mobility management scheme offering the best connection continuously. In this paper, a mobility management architecture focusing on efficient network selection and timely handling of vertical and horizontal hand-overs is proposed. The solution is based on mobile IP where hand-over decisions are taken based upon calculations of a metric combining delay and delay jitter. For efficiency reasons, the frequency of binding updates is dynamically controlled, depending on speed and variations in the metric. The dynamic frequency of binding updates helps the timely discovery of congested access points and cell edges so as to allow efficient hand-overs that minimize packet drops and hand-over delays. Results show that the overall signaling cost is decreased and changes in networking conditions are detected earlier compared to standard mobile IP.

关键词： Barium mobile communication mobile radio mobility management Manganese mobile computing Jitter IP networks

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M4: Multimedia mobility manager: A seamless mobility management architecture supporting multimedia applications 07

M4: Multimedia mobility manager: A seamless mobility managem...

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6th International Conference on mobile and Ubiquitous Multimedia, MUM 2007

作者： Andersson, Karl Granlund, Daniel Åhlund, Christer Division of Mobile Networking and Computing Luleå University of Technology SE-931 87 Skellefteå Sweden

ISBN: (纸本)9781595939166

In this paper, a proof-of-concept and a software architecture, M 4 (MultiMedia Mobility Manager), is presented. In short, M 4 is offering seamless mobility management to multimedia applications using a variety of wireless access networks. First, M4 is built on multihomed mobile IP building on the principle of soft handovers. Second, network selection in M4 is based on a network layer metric combining round-trip times and jitter in round-trip times. Third, the end-user can enter its own preferences on network selection through a policy-based extension to the proposed network selection algorithm. The proposed architecture is evaluated in a live heterogeneous networking environment where handover performance is studied in detail. In addition, user-perceived quality of experience for Voice over IP using the M4 software architecture has been studied. Last, downloads of large amount of data using a combination of high and low capacity wireless networks in M4 were studied. Results indicate that the architecture as a whole and the proposed algorithms perform well. M4 can thus be seen as an implementation of the "Always Best Connected" vision. Copyright 2007 ACM.

关键词： Software architecture

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Port-based multihomed mobile IPv6: Load-balancing in mobile ad hoc networks

Port-based multihomed mobile IPv6: Load-balancing in mobile ...

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32nd IEEE Conference on Local Computer Networks, LCN 2007

作者： Brännström, Robert Åhlund, Christer Zaslavsky, Arkady Division of Mobile Networking and Computing Luleå University of Teohnology Skellefteå Sweden School of Computer Science and Software Engineering Monash University Melbourne Australia

ISBN: (纸本)0769530001

With today's heterogeneous access to the Internet, users will move between wired and wireless environments and between infrastructure mode and ad hoc mode of wireless communication. When a mobile node moves from an infrastructure connection and connects multihop to an Internet gateway, the performance will degrade and it may not be able to send all of its traffic via a single gateway. This highlights the need of load-balancing between Internet gateways, especially since the behavior of users today involves a multitude of parallel activities generating multiple flows. This paper proposes a solution that enables distribution of individual traffic flows via different Internet gateways instead of using one single gateway. The proposal includes extensions to mobile IP in order to handle flow mobility bindings. The performance of the solution is verified by simulation studies. © 2007 IEEE.

关键词： mobile ad hoc networks

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Port-based Multihomed mobile IPv6: Load-balancing in mobile Ad hoc Networks

Port-based Multihomed Mobile IPv6: Load-balancing in Mobile ...

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Conference on Local Computer Networks (LCN)

作者： Robert Brannstrom Christer Ahlund Arkady Zaslavsky Division of Mobile Networking & Computing Luleå University of Technology Skelleftea Sweden School of Computer Science & Software Engineering Monash University Melbourne Australia

关键词： mobile ad hoc networks IP networks Ad hoc networks Telecommunication traffic Internet mobile computing Routing protocols Computer networks Proposals Spread spectrum communication

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