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Teletraffic Congress, 2009. ITC 21 2009. 21st International

Date 15-17 Sept. 2009

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Displaying Results 1 - 25 of 61
  • [Front matter]

    Publication Year: 2009, Page(s):c1 - c2
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  • Program outline

    Publication Year: 2009, Page(s): 1
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  • Foreword

    Publication Year: 2009, Page(s):1 - 2
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  • Table of contents

    Publication Year: 2009, Page(s):1 - 6
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  • Optimal call routing in VoIP

    Publication Year: 2009, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (155 KB) | HTML iconHTML

    We evaluate from a VoIP provider's point of view possible strategies for selecting PSTN gateways and/or signaling servers (perhaps through ENUM) under blocking uncertainty. Each alternative can have different price for a terminating VoIP call and different blocking probability. A customer placing a call to the VoIP provider is impatient and may hang-up if the delay in setting up the call is large.... View full abstract»

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  • Two steps towards practical compact routing

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (329 KB) | HTML iconHTML

    The stress on today's inter-domain routing system is constantly and sharply increasing. The mere size of the Internet, operational practices and a number of limitations of the routing protocol itself worsen the scaling behavior of this fundamental service at an alarming rate. This paper introduces 2SIDR, a two step inter-domain routing approach that aims at significantly reducing the state require... View full abstract»

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  • On-line survivable routing in WDM networks

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (334 KB) | HTML iconHTML

    In WDM networks, survivable routing and wavelength assignment (SRWA) involves assigning link-disjoint primary and backup lightpaths. In the on-line SRWA problem, a sequence of requests arrive and each request is either accepted or rejected based only on the input sequence seen so far. For special networks, we establish on-line algorithms with constant and logarithmic competitive ratios. It is not ... View full abstract»

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  • Analysis of a fountain codes based transport in an 802.11 WLAN cell

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB) | HTML iconHTML

    A fountain codes based transport (FCT) protocol relies on an alternate paradigm to that of the ubiquitous TCP. It abolishes the need for a reverse feedback mechanism usually essential to provide reliability in packet data transmission. Absence of a reverse feedback mechanism can substantially improve the performance of networks with half-duplex wireless channels (such as 802.11 WLANs), where colli... View full abstract»

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  • Distributed reservation-based QoS in ad hoc networks with Internet access connectivity

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (147 KB) | HTML iconHTML

    Real-time applications introduce new requirements on wireless networks and impose quality thresholds on parameters like delay, jitter, throughput, and packet loss in order to run smoothly. This paper addresses this issue by presenting a MAC scheme that offers real-time applications the opportunity to reserve transmission time based on their QoS requirements for contention-free medium access. Our s... View full abstract»

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  • On the unfair channel access phenomenon in wireless LANs

    Publication Year: 2009, Page(s):1 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (183 KB) | HTML iconHTML

    This paper shows that the relative collision probability for packets in wireless LAN 802.11 networks decreases with increasing load offered by the respective station. This denotes a clearly unfair channel access which is important to be aware of, e.g., when collision probabilities are measured and used for reactive control of contention windows. We model the unfair channel access phenomenon analyt... View full abstract»

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  • Admission control with resource reallocation

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (350 KB) | HTML iconHTML

    Quality of service architectures that provide efficient resource allocation for multiple services have been an active research topic for a long time, but unsuccessful when it comes to deployment. The goal in this paper is to propose an admission control algorithm that both preserves the quality of service and efficiently shares resources based on the demand in different classes. Based on the conce... View full abstract»

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  • Novel overload controls for SIP networks

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (185 KB)

    The increasing use of SIP in next generation networks necessitates that SIP networks provide adequate control mechanisms to optimize transaction throughput and prevent congestion collapse during traffic overloads. SIP elements need well behaved internal overload controls to detect and throttle traffic, and external controls between SIP elements are needed to throttle traffic closer to the source. ... View full abstract»

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  • Congestion control and pricing of volume intensive applications

    Publication Year: 2009, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (162 KB) | HTML iconHTML

    We consider fair sharing of network resources over a period of time between offline and interactive users. The former value total transferred volume while the latter have time-dependent valuations for instantaneous bandwidth. Following the work of Kelly on fair bandwidth sharing, we express the system optimum as an equilibrium of traditional congestion control taking place in a fast timescale and ... View full abstract»

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  • Backpressure-based control protocols: Design and computational aspects

    Publication Year: 2009, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (355 KB) | HTML iconHTML

    Congestion control in packet-based networks is often realized by feedback protocols. In this paper we assess their performance under a back-pressure mechanism that has been proposed and standardized for Ethernet metropolitan networks. In such a mechanism the service rate of an upstream queue is reduced when the downstream queue is congested, in order to protect the downstream queue. We study a Mar... View full abstract»

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  • Parametric distance distributions for fixed access network analysis and planning

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (425 KB) | HTML iconHTML

    The access network displays the important particularity that the locations of the network components strongly depend on geometrical features such as road systems and city's architecture. This paper presents a model for access networks arising from stochastic geometry, which takes this geometric structure into consideration, and thus offers a relevant view on location-dependent characteristics such... View full abstract»

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  • A novel analytical framework for mobility modeling in all-ip wireless systems

    Publication Year: 2009, Page(s):1 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (949 KB) | HTML iconHTML

    In all-IP wireless networks, groups of cells are served by IP access gateways. When users move between regions served by different gateways, IP and application layer mobility signaling is triggered. The key performance indicator to assess a given mobility protocol is the mean number of gateway handoffs. In this paper, we propose a new fundamental approach, which majorly extends past work in cellul... View full abstract»

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  • Connectivity dynamics for vehicular ad-hoc networks in signalized road systems

    Publication Year: 2009, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (341 KB) | HTML iconHTML

    In this paper, we analyze the connectivity dynamics of vehicular ad-hoc networks in a generic signalized urban route. Given the velocity profile of an urban route as a function of space and time, we utilize a fluid model to characterize the general vehicular traffic flow, and a stochastic model to capture the randomness of individual vehicle. From the fluid and stochastic models, we can acquire re... View full abstract»

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  • Adaptive and efficient radio access selection and optimisation in a heterogeneous communication environment

    Publication Year: 2009, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB) | HTML iconHTML

    In recent years, a variety of wireless network technologies have been developed and deployed. Future mobile communication system will have a packet switched core. The access to the mobile communication system will not be restricted to the mobile cellular networks but may be via other wireless or even wired technologies. Such hybrid access can enable service convergence, joint resource management a... View full abstract»

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  • Analysis of a Bloom Filter algorithm via the supermarket model

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (215 KB) | HTML iconHTML

    This paper deals with the problem of identifying elephants in the Internet traffic. The aim is to analyze a new adaptive algorithm based on a bloom filter. This algorithm uses a so-called min-rule which can be described as in the supermarket model. This model consists of joining the shortest queue among d queues selected at random in a large number of m queues. In case of equality, one of the shor... View full abstract»

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  • A mean-field approach to some Internet-like random networks

    Publication Year: 2009, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB) | HTML iconHTML

    A conditionally Poissonian power-law random graph with infinite degree variance is considered as a random network model. A method for elegant analytical computation of accurate approximations for various network characteristics is introduced, based on slight redefinition of the model in terms of non-homogeneous Poisson point processes and on the replacement of certain random variables by their exp... View full abstract»

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  • Variability of service times and throughput efficiency trade-off in IEEE 802.11 DCF

    Publication Year: 2009, Page(s):1 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (738 KB) | HTML iconHTML

    First order metrics (throughput, average delay) of the IEEE 802.11 DCF MAC protocol have been extensively analyzed. In this work the probability distribution of the service time is derived and it is used to highlight the source of service time burstiness. It is proved that the variance of the service time is minimized by taking the same contention window value at each back off stage, under the con... View full abstract»

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  • Maximum weight independent sets in an infinite plane

    Publication Year: 2009, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (198 KB) | HTML iconHTML

    We study the maximum weight independent sets of links between nodes distributed as a spatial Poisson process in an infinite plane. Three different definitions of the weight of a link are considered, leading to slight variations of what is essentially a spatial reuse problem in wireless multihop networks. A simple Boolean interference model is assumed with the interference radius equaling the trans... View full abstract»

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  • Mixing malleable and rigid bandwidth requests for optimizing network provisioning

    Publication Year: 2009, Page(s):1 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (209 KB) | HTML iconHTML

    To address the anticipated sporadic terabyte demand generated by high-end time-constrained applications, dynamically reconfigurable optical networks services are envisioned. However, the time and rate granularities of a bandwidth reservation service and those of transfer tasks using the reserved capacity are not necessarily of the same order of magnitude. This may lead to a poor resource utilizati... View full abstract»

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  • Integration of equipment constraints in the capacity-planning process

    Publication Year: 2009, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (150 KB) | HTML iconHTML

    This paper addresses the network capacity planning (or dimensioning) problem. The assignment of links capacity is often made by taking into account link costs and neglecting other equipment costs such as routers and line cards. However, with the massive deployment of optical fiber in all western countries, the cost of leasing transmission lines becomes cheaper and cheaper, and equipment costs are ... View full abstract»

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  • Energy-efficient management of UMTS access networks

    Publication Year: 2009, Page(s):1 - 8
    Cited by:  Papers (25)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (233 KB) | HTML iconHTML

    The increasing concern about the energy consumption of telecommunication networks is driving operators to manage their equipments so as to optimize energy utilization without sacrificing the user experience. In this paper, we focus on UMTS access networks, since access devices are the main energy consumers in UMTS networks. We propose a novel approach for the energy-aware management of UMTS access... View full abstract»

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