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Fifth IEE International Conference on 3G Mobile Communication Technologies

2004

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Displaying Results 1 - 25 of 153
  • Implementation and analysis of VoIP services in WLANs

    Publication Year: 2004, Page(s):548 - 552
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1006 KB)

    The paper explores the possibility of implementing VoIP based on SIP within a WLAN. Based on this system, QoS requirements for WLANs have been investigated and the performance in terms of the MOS value has been analysed. It shows that the QoS performance of the VoIP traffic is related to both the number of communicating pairs and the traffic pattern. Methods for improving the limitation of the leg... View full abstract»

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  • Client controlled network selection

    Publication Year: 2004, Page(s):543 - 547
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (978 KB)

    It is likely that an ensemble of overlapping heterogeneous wireless networks will be required to provide ubiquitous data communications. In this scenario, the mobile user's choice of network will directly affect the applications' performance. The paper examines this decision, and proposes that it is made by the client application by considering network characteristics and cost. This is facilitated... View full abstract»

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  • Iterative multi-user decoding with time-variant channel estimation for MC-CDMA

    Publication Year: 2004, Page(s):88 - 92
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1000 KB)

    We propose an iterative receiver for a multi-carrier (MC) code division multiple access (CDMA) system in the uplink for users moving at vehicular speed. MC-CDMA is based on orthogonal frequency division multiplexing (OFDM), thus time-variant channel estimation can be performed for every subcarrier independently. The variation of a subcarrier over the duration of a data block is upper bounded by a ... View full abstract»

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  • Improvement the performance of voice quality over UMTS system in packet switching networks

    Publication Year: 2004, Page(s):537 - 542
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1052 KB)

    In this paper, we review the key features of the air interface of the Universal Mobile Telecom System (UMTS), standardized by 3GPP, in which functionality can be tailored to the requirement of VoIP applications. Then we evaluate the performance of the network and its effect on QoS of VoIP applications by adding a new entity for the system, a router with air interface, instead of a BS (base station... View full abstract»

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  • Dynamic pilot power allocation in CDMA systems

    Publication Year: 2004, Page(s):245 - 249
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (981 KB)

    In this paper a new concept for the pilot power allocation in code division multiple access (CDMA) mobile communication systems is introduced. The drawback of current constant pilot power allocation is the so-called cell breathing effect. The introduced concept of a dynamic pilot power allocation scheme tries to adapt the actual pilot power according to the current load situation in the cell. Thus... View full abstract»

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  • MMSE DFE for high-rate MIMO transmission over channels with ISI

    Publication Year: 2004, Page(s):83 - 87
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1010 KB)

    Minimum mean-squared error decision-feedback equalisation (DFE) for joint spatial/temporal equalisation is derived. No finite length assumptions are made, but asymptotic results, i.e., ultimate limits, are studied. The performance of MMSE DFE for transmission over MIMO ISI channels is assessed by means of numerical simulations for typical high-rate wireless scenarios. View full abstract»

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  • Position location scheme for low coverage areas

    Publication Year: 2004, Page(s):291 - 295
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (960 KB)

    A network-based hybrid location scheme is proposed for the localization of mobile users at outskirts of coverage areas. Since in the case of low subscriber density areas, the number of base stations is reduced, difference time of arrival (DTOA) and angle of arrival (AOA) measurements are combined to allow acquisition of mobile location using only one BS and one LMU as fixed land references. The fe... View full abstract»

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  • Mutual authentication of B3G devices within personal distributed environments

    Publication Year: 2004, Page(s):452 - 456
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1001 KB)

    The personal distributed environment (PDE) is a new concept arising in personal communications beyond 3G (B3G). This paper briefly describes the environment, surveys the protocols available to provide PDE authentication, and assesses their suitability for adaptation to the PDE. View full abstract»

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  • VoIP interconnect and quality impacts on 3G core network evolution

    Publication Year: 2004, Page(s):534 - 536
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (883 KB)

    This paper examines the deployment of VoIP on 3GPP R4/5 network architectures and the parameters that affect the voice quality of the system. The paper then examines how the budgets for these speech quality parameters are stretched when calls are routed over multiple VoIP networks. Finally, the paper shows how VoIP interconnect is required to maintain speech quality in an IP environment and the im... View full abstract»

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  • Performance evaluation of smart antenna concepts and shared channel transmission in 3G mobile communication systems

    Publication Year: 2004, Page(s):271 - 275
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (971 KB)

    In this work we investigate the influence of smart antenna concepts in the downlink of third generation mobile communication systems (3G) like UMTS (Universal Mobile Telecommunication System) when packet scheduled transmission over downlink shared channels (DSCH) is carried out. We consider hexagonal site structures that are subdivided in three or six subsectors or cells. For the three sector case... View full abstract»

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  • Soft, vertical handover of streamed video

    Publication Year: 2004, Page(s):432 - 436
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (941 KB)

    The delay and jitter of an RTP (real time protocol) stream transported by TCP over WLAN are examined as candidates for assisting handover between networks. Jitter was found to be a good indicator of when a mobile is close to the edge of a WLAN cell and was used to spawn a vertical handover mechanism. The implemented handover scheme used an averaged delay difference to complete the handover of the ... View full abstract»

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  • Introduction to WCDMA enhanced uplink

    Publication Year: 2004, Page(s):240 - 244
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (925 KB)

    In WCDMA, uplink radio resources are shared by multiple users and the radio resource management (RRM) is done at the UTRAN (UMTS Terrestrial Radio Access Network). In this paper, the link and system performance of the WCDMA uplink is evaluated using different techniques such as retransmissions with incremental redundancy (IR), short frame durations and fast scheduling. It is seen that the radio li... View full abstract»

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  • Iterative joint detection using recursive signal cancellation

    Publication Year: 2004, Page(s):78 - 82
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (999 KB)

    It is argued that iterative signal cancellation receivers, with or without the use of error control coding, are preferred for practically viable multiuser detection. Achievable spectral efficiencies are calculated for both cases and arguments are given on how to achieve maximum spectral efficiencies by rate or power layering of the different users in a multiple access environment. The achievable s... View full abstract»

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  • MDP-based analysis for multicode assignment in 3G WCDMA networks

    Publication Year: 2004, Page(s):286 - 290
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1033 KB)

    3G WCDMA networks adopt the orthogonal variable spreading factor (OVSF) code tree as code management to assign single channelization code for achieving variable rate for real-time multimedia communication. Based on the orthogonal characteristic of the OVSF codes, an allocated code will block the channelization codes, which are at the descendant branches of the allocated code and the ancestral code... View full abstract»

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  • Securing next generation mobile networks

    Publication Year: 2004, Page(s):447 - 451
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (961 KB)

    Mobile networks are known to be a reliable and secure platform for voice communication and point-to-point data connections. With the installation of next generation mobile networks comes the need to open up these closely guarded networks to a much more diverse set of users and services. Doing this without compromising the overall security and reliability of the network becomes the next challenge. ... View full abstract»

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  • Coverage and planning aspects of MBMS in UTRAN

    Publication Year: 2004, Page(s):529 - 533
    Cited by:  Papers (9)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (974 KB)

    The multimedia broadcast and multicast service (MBMS) is a key element of the forthcoming release-6 of the 3GPP UTRAN and GERAN standards. This paper outlines the expected network resource demands for providing MBMS in an UTRA FDD network. The proposed MBMS related enhancements in the physical layer specifications and their effects on resource requirements are examined in detail. Such improvements... View full abstract»

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  • Experience of Linux and GTK+2 Smartphone

    Publication Year: 2004, Page(s):267 - 270
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (991 KB)

    A smartphone is a newcomer that has the ability of personal digital assistants (PDA) with the small appearance of cellular telephones. Although a PDA phone, which is a PDA with a CDMA or GSM module, has bigger appearance, a smartphone is a small device, which looks like a cellular telephone with PDA ability. Most smartphones have adopted Smartphone2002, Smartphone2003 or embedded Linux. Smartphone... View full abstract»

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  • Performance enhancement of real-time video communications over UTRAN by adaptive resource allocation: system level evaluation

    Publication Year: 2004, Page(s):427 - 431
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1008 KB)

    A novel adaptive resource allocation algorithm for video services over UTRAN is proposed. The proposed algorithm deploys joint spreading gain control and transmission power allocation to enhance the performance of real-time video communications over time-varying error-prone environments. The proposed algorithm operates in two phases. In the first phase, adaptation is conducted based on the channel... View full abstract»

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  • Provision of MBMS over the GERAN: technical solutions and performance

    Publication Year: 2004, Page(s):494 - 498
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1005 KB)

    3GPP is currently in the process of standardising Multimedia Broadcast and Multicast Services (MBMS). The technical solutions adopted for the provision of these services over the GERAN (GSM/EDGE radio access network) A/Gb mode are presented. Simulation results are provided showing the data rates that can be achieved over the radio interface using the data transfer mechanisms already available in R... View full abstract»

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  • Chip-level Kalman filter equalization for the UMTS-FDD WCDMA downlink with multiple base stations

    Publication Year: 2004, Page(s):235 - 239
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1013 KB)

    For the wideband code-division multiple access (WCDMA) frequency-division duplexing (FDD) downlink of the Universal Mobile Telecommunication System (UMTS), we derive a chip-level equalization algorithm that jointly estimates the signals transmitted from multiple base stations. We focus on a scenario where the mobile terminal is located at the cell edge or in the intersection between different cell... View full abstract»

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  • On the uplink performance of band-limited DS-CDMA systems using RAKE-receiver over Nakagami-m channels

    Publication Year: 2004, Page(s):312 - 316
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (964 KB)

    In this paper, we investigated the BER performance of DS-CDMA using various chip-waveforms, which include three time-limited chip-waveforms and two bandlimited chip-waveforms. Closed-form formulae were derived for evaluating the achievable bit-error rate performance with the aid of the standard Gaussian approximation. View full abstract»

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  • Impact of dead zones on the performance of urban 3G cellular networks

    Publication Year: 2004, Page(s):514 - 518
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1038 KB)

    The impact of dead zones on the performance of the frequency division duplex (FDD) mode of an urban UTRA cellular network was investigated. An urban cellular network was simulated with and without ACI produced by another uncoordinated cellular network. It was found that the overall capacity of the 'victim' cellular network in the presence of ACI was similar to the capacity without ACI for the valu... View full abstract»

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  • Enabling UMTS end-to-end performance analysis

    Publication Year: 2004, Page(s):29 - 33
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1030 KB)

    Because of its inherent complexity, the Universal Mobile Telecommunication System (UMTS) network deployment demands a significant amount of system simulations and modelling activities to ensure optimum network performance and integrity. The complexity of the radio interface, based on wideband code division multiple access (WCDMA), compounded with the need to satisfy an end-to-end quality of servic... View full abstract»

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  • An analysis of delay of small IP packets in cellular data networks

    Publication Year: 2004, Page(s):347 - 351
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (964 KB)

    The delay characteristics of small IP packets in cellular data networks is investigated through the analysis of the SR-ARQ mechanism. The delay of the radio link controller is taken as the primary delay in the radio access network and all core networking delays are neglected. Results indicate that the average delay may be a misleading measure of system performance for conversational traffic such a... View full abstract»

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  • A novel approach to consider spatial user information for scheduling in 3G mobile communication systems

    Publication Year: 2004, Page(s):193 - 197
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (968 KB)

    So far, spatial multiplexing techniques in terms of smart antennas or beamforming have been applied independently from time multiplexing schemes or packet scheduling in third generation (3G) mobile communication systems. Time multiplexing schemes or packet scheduling algorithms are used for transmission of delay tolerant data such as E-mail and download services. With the application of beamformin... View full abstract»

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