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  • 1.
    Fiedler, Markus
    et al.
    Blekinge Institute of Technology, School of Computing.
    Wac, Katarzyna
    Bults, Richard
    Arlos, Patrik
    Blekinge Institute of Technology, School of Computing.
    Estimating performance of mobile services from comparative output-input analysis of end-to-end throughput2013In: IEEE Transactions on Mobile Computing, ISSN 1536-1233, E-ISSN 1558-0660, Vol. 12, no 9, p. 1761-1773Article in journal (Refereed)
    Abstract [en]

    Mobile devices with ever-increasing functionality and the ubiquitous availability of wireless communication networks are driving forces behind innovative mobile applications enriching our daily life. One of the performance measures for a successful application deployment is the ability to support application-data flows by heterogeneous networks within certain delay boundaries. However, the quantitative impact of this measure is unknown and practically infeasible to determine at real-time due to the mobile device resource constraints. We research practical methods for measurement-based performance evaluation of heterogeneous data communication networks that support mobile application-data flows. We apply the lightweight Comparative Output-Input Analysis (COIA) method estimating an additional delay based on an observation interval of interest (e.g., one second) induced on the flow. An additional delay is the amount of delay that exceeds non-avoidable, minimal end-to-end delay caused by the networks propagation, serialization and transmission. We propose five COIA methods to estimate additional delay and we validate their accuracy with measurements obtained from the existing healthcare and multimedia streaming applications. Despite their simplicity, our methods prove to be accurate in relation to an observation interval of interest, and robust under a variety of network conditions. The methods offer novel insights into application-data delays with regards to the performance of heterogeneous data communication networks.

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  • 2.
    Louis, Sibomana
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
    Hans-Jürgen, Zepernick
    Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
    Hung, Tran
    Mälardalens högskola, SWE.
    Charles, Kabiri
    University of Rwanda, RWA.
    A Framework for Packet Delay Analysis of Point-to-Multipoint Underlay Cognitive Radio Networks2017In: IEEE Transactions on Mobile Computing, ISSN 1536-1233, E-ISSN 1558-0660, Vol. 16, no 9, p. 2408-2421Article in journal (Refereed)
    Abstract [en]

    This paper presents a queueing analytical framework for the performance evaluation of the secondary user (SU) packet transmission with service differentiation in a point-to-multipoint underlay cognitive radio network. The transmit power of the SU transmitter is subject to the joint outage constraint imposed by the primary user receivers (PU-Rxs) and the SU maximum transmit power limit. The analysis considers a queueing model for secondary traffic with multiple classes, and different types of arrival and service processes under a non-preemptive priority service discipline. The SU quality of service (QoS) is characterized by a packet timeout threshold and target bit error rate. Given these settings, analytical expressions of the packet timeout probability and average transmission time are derived for opportunistic and multicast scheduling. Moreover, expressions of the average packet waiting time in the queue and the total time in the system for each class of traffic are obtained. Numerical examples are provided to illustrate the secondary network performance with respect to various parameters such as number of PU-Rxs and SU receivers, SU packet arrival process, QoS requirements, and the impact of interference from the primary network to the secondary network.

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