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Telecommunications, 2003. ICT 2003. 10th International Conference on

Date Feb. 23 2003-March 1 2003

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  • 10th International Conference on Telecommunications [front matter]

    Publication Year: 2003, Page(s):0_1 - xxix
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  • Elements for the study of stability and performances in real-time queues

    Publication Year: 2003, Page(s):1126 - 1132 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (425 KB) | HTML iconHTML

    In this paper, we focus on a study of the performance of some real-time queues, where customers have temporal constraints to be serviced. The aim is to estimate some performances in the non-preemptive EDF-D case. First, the problem of stability for the queue was considered to ensure that a steady state is reached. Then, some results for the estimation of the loss probability of the queue are prese... View full abstract»

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  • A novel approach for reconfigurable systems at RAN Level

    Publication Year: 2003, Page(s):1120 - 1125 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB) | HTML iconHTML

    Reconfigurability is one of the key technologies for systems beyond 3G. Reconfigurable terminals facilitate seamless roaming between access networks offering different QoS capabilities. The management requirements to control the reconfiguration process of terminals are analyzed. Accordingly, a supporting network element and subsequent software architectural design are proposed. In particular, the ... View full abstract»

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  • Fully-diverse unitary subgroup space-time codes

    Publication Year: 2003, Page(s):1302 - 1306 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (333 KB) | HTML iconHTML

    Differential unitary space-time group codes are effective for multiple antenna wireless communications, especially in rapidly changing mobile environments. In this paper, we propose new unitary infinite subgroups for differential good space-time codes. The unitary subgroups are on the basis of Bruhat decomposition by the maximal torus and Weyl groups on Lie groups theory. Some interesting examples... View full abstract»

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  • Quasi-optimal leader election algorithms in radio networks with log-logarithmic awake time-slots

    Publication Year: 2003, Page(s):1113 - 1119 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (407 KB) | HTML iconHTML

    A radio network (RN) is a distributed system consisting of n radio stations. We designed and analyzed two distributed leader election protocols in RN where the number n of radio stations is unknown. The first algorithm runs under the assumption of limited collision detection, while the second assumes that no collision detection is available. By "limited collision detection", we mean that if exactl... View full abstract»

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  • Simulation study on the effect of the trTCM parameters

    Publication Year: 2003, Page(s):1482 - 1488 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB) | HTML iconHTML

    In this paper, we study the effect of the two-rate three-color marker (trTCM) parameters on policing accuracy via computer simulation. The trTCM is a traffic conditioner and can be used as a policing/limiting mechanism in differentiated service networks. The trTCM algorithm described in RFC 2698 was configured using four traffic parameters: CBS (committed burst size), PBS (peak burst size), CIR (c... View full abstract»

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  • Decentralized local backup LSP calculation with efficient bandwidth sharing

    Publication Year: 2003, Page(s):929 - 937 vol.2
    Cited by:  Papers (3)
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    The protection of virtual circuits (label switched paths, LSPs) in (G)MPLS (generalized multi-protocol label switching) networks is discussed. The proposed algorithm is designed to protect traffic with strong delay requirements such as EF (expedited forwarding) ordered aggregates in a DiffServ domain. For this type of application end-to-end recovery schemes are usually considered to be far too slo... View full abstract»

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  • Methods of perturbation and equalization for multi-user detection

    Publication Year: 2003, Page(s):1294 - 1301 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB) | HTML iconHTML

    To simplify the solution of multi-user detection (MUD) problems in band limited CDMA systems, the approximately known function of pulse shaping is separated from the unknown time varying channel functions by blind equalization. Then, the MUD is solved by perturbation method. The iteration of perturbation and equalization corrects more errors without incurring much complexity. The simple models are... View full abstract»

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  • Internet routing emulation system and stress testing

    Publication Year: 2003, Page(s):1020 - 1026 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB) | HTML iconHTML

    With the incessant growth of the Internet and the renewal of routing protocols, it becomes a demanding task to test the running characteristics of routing protocol implementations (RPI) in a real large-scale network. We propose a novel approach, named stress testing, to inspect the running characteristics. We compared stress testing with traditional protocol testing, and give the abstract test met... View full abstract»

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  • Resource provisioning in a multi-service enabled ADSL system

    Publication Year: 2003, Page(s):1105 - 1112 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (506 KB) | HTML iconHTML

    The resource provisioning issue for the discrete multi-tone (DMT) based asymmetric digital subscriber loop (ADSL) network is addressed. Currently, the provisioning scheme for ADSL network provisions the network based on the physical layer performance. However, provision for the network at the physical layer cannot provide assurance to TCP/UDP quality. The simulation results from previous work show... View full abstract»

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  • Implementation of asynchronous performance measurement (APM) protocol for the Internet

    Publication Year: 2003, Page(s):994 - 1000 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (427 KB) | HTML iconHTML

    Due to the asymmetric characteristics of links on the Internet, one-way delay measurement has become an imperative performance metric. Current measuring protocols usually rely on synchronous technique, which requires clock synchronization at all measurement sites. An asynchronous measuring protocol APM on FreeBSD platform is implemented. The implementation of APM and experiments conducted on a tes... View full abstract»

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  • A simple QoS service provision framework for beyond 3rd generation scenarios

    Publication Year: 2003, Page(s):1475 - 1481 vol.2
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (623 KB) | HTML iconHTML

    This paper describes a global quality of service architecture for mobile, audited and accountable environments. Target networks are "Beyond 3rd Generation Networks", where several heterogeneous access networks are available to the user. Providing per user and per service differentiated QoS is a key issue in these networks. The paper proposes an integrated management approach for service and networ... View full abstract»

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  • Improved congestion control with hybrid RED

    Publication Year: 2003, Page(s):923 - 928 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (438 KB) | HTML iconHTML

    The issues relating to the choice of queue length indication parameter for packet marking/dropping decisions in random early detection (RED) type algorithm under varying traffic conditions are addressed. Modifications to RED are proposed by the use of both instantaneous queue size and its EWMA for packet marking/dropping and reducing the effort of EWMA value when queue size is less, then mint... View full abstract»

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  • Hidden Markov multiresolution texture segmentation using complex wavelets

    Publication Year: 2003, Page(s):1624 - 1630 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (473 KB) | HTML iconHTML

    In block-based statistical texture segmentation approaches, modeling the global dependency between blocks as well as local statistics within a block is important for segmentation performance. A hidden Markov model (HMM) can be combined with a hidden Markov tree (HMT) to form an HMM-HMT model, which captures both global and local properties. Unfortunately, the real wavelet transform, on which the m... View full abstract»

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  • New upper bounds on separating codes

    Publication Year: 2003, Page(s):1290 - 1293 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (291 KB) | HTML iconHTML

    Separating codes, initially introduced to test automaton, has been revived lately in the study of fingerprinting codes, which are used for copyright protection. Separating codes play a significant role in making the fingerprinting scheme secure against coalitions of pirates. In this paper, we provide better bounds on such codes. View full abstract»

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  • Frame arrangement on multiple frequency carriers in TDD based PRMA

    Publication Year: 2003, Page(s):1561 - 1565 vol.2
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    This paper studies the different arrangements of frames in the time division duplexing (TDD)-based packet reservation multiple access (PRMA) protocol on multiple frequency carriers. Two frame arrangements, namely, aligned and slanted arrangement, are investigated. In the aligned arrangement, frame boundaries are aligned on all frequency carriers, in the slanted arrangement, the frame boundaries ar... View full abstract»

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  • Analysis on the transmitter performance of UE for W-CDMA

    Publication Year: 2003, Page(s):1147 - 1150 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB) | HTML iconHTML

    The RF transmitting parameters of user equipment (UE) for W-CDMA system based on the third generation partnership project (3GPP) specifications are evaluated. The parameters of transmitter are derived from the aspect of RF. In order to keep UE in high performance, the transmitter requirements such as ACLR, EVM, peak code domain error, spectrum emission mask are considered. The UE transceiver is im... View full abstract»

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  • Network management system for wireless LAN service

    Publication Year: 2003, Page(s):948 - 953 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB) | HTML iconHTML

    The purpose of wireless LAN service is to provide mobile Internet environment for people who want to have wireless Internet using mobile devices. WLAN network consists of devices such as APs, routers, switches that are located in wide area, and they must be managed efficiently. So, wireless LAN network management system is developed, which is WLAN-NMS. It manages information of network elements an... View full abstract»

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  • A design of multiagent-based system for routing

    Publication Year: 2003, Page(s):1014 - 1019 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (565 KB) | HTML iconHTML

    The rapid development of internetworking and the need to deploy much more intelligent systems to speed up convergence times have brought intelligent agents in data communication domain. Intelligent agents are ideally qualified to knock the door of data communication applications, and this is due to their interactivity, autonomy, reactivity, and intelligence. A novel functional design of a multiage... View full abstract»

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  • Performance and capacity improvements of OFDM wireless LANs with multiple antennas and subchannel power control

    Publication Year: 2003, Page(s):1412 - 1416 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (377 KB) | HTML iconHTML

    Multiple transmit-and-receive antennas can be used in orthogonal frequency division multiplexing (OFDM) systems to improve communication quality and capacity. In this paper, we investigate the performance of a multiple antenna system with subchannel power control for OFDM Wireless LAN. Furthermore, we employed a turbo product code at the encoder to further enhance the quality of transmission for h... View full abstract»

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  • Efficient workspaces through semantic reliability

    Publication Year: 2003, Page(s):1099 - 1104 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (469 KB) | HTML iconHTML

    Transport level protocols typically provide best-effort data delivery where no attempts are made to recover lost packets, or reliable data delivery where techniques are used to ensure that all data sent out eventually reaches the receivers. However, it has been suggested that some applications will perform better when using dynamically configurable reliability based on application level semantics.... View full abstract»

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  • Opto-VLSI 4G MCS for ultra -high speed digital image transmission

    Publication Year: 2003, Page(s):1670 - 1674 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB) | HTML iconHTML

    An Opto-VLSI system implementation for 4G Mobile Communication Service (MCS): Image Processor with Optical Space Switch that is capable of switching a large number of input and output fibers in real time is presented. A reconfigurable network may offer bandwidth on demand by configuring itself to optimize for the traffic bottlenecks. The image processor performs 30 frames/s of QCIF at maximum cloc... View full abstract»

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  • Exploring new boundaries for e-learning: multicasting via satellite

    Publication Year: 2003, Page(s):1741 - 1745 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB) | HTML iconHTML

    To manage successful virtual distance learning programs, education institutes should implement multimedia enriched learning materials which can be used in multiple environments/situations. This not only opens up new markets but also gives teachers and learners flexible access to rich online learning resources, leading to new pedagogic practice and giving students better preparation for the challen... View full abstract»

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  • Evolutionary synthesis of communication protocols

    Publication Year: 2003, Page(s):986 - 993 vol.2
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (555 KB) | HTML iconHTML

    A methodology for the synthesis of communication protocols based on evolutionary techniques is presented. It enables to automatically generate finite-state models that synthesize protocol specifications from partial input/output sequences. These partial sequences, directly derived from service specifications and a set of associated protocol data units (PDUs), are training sequences that drive the ... View full abstract»

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  • A simplified design and implementation of a multimedia streaming system

    Publication Year: 2003, Page(s):1470 - 1474 vol.2
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    Multimedia synchronization captures a large variety of spatial, temporal and logical issues. Understanding the user demand is still in its infancy. In this paper, we introduce the status quo of our synchronized interactive multimedia streaming system. System components are described with emphasis on the flow algorithm of communication events. The paradigm of event scheduling is described in its fo... View full abstract»

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