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3G Mobile Communication Technologies, 2003. 3G 2003. 4th International Conference on (Conf. Publ. No. 494)

Date 25-27 June 2003

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Displaying Results 1 - 25 of 95
  • Dynamic channel allocation (DCA) initiation analysis in a UTRA_TDD system

    Publication Year: 2003 , Page(s): 364 - 368
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (397 KB)  

    The paper describes the analysis of the DCA initiation process in a UTRA-TDD system based on the interference conditions. The initiation process is controlled by three parameters. The first parameter describes the total packet loss experienced by the user over a time window where the number of packet losses is counted over selected time period. The second parameter determines the threshold of the maximum allowable packet loss the user can have within the time window before DCA is initiated and the third parameter is the time gap between the initiation of the current and the next channel allocation. The analysis plans to achieve the optimum initiation time of DCA to reduce the amount of allowable packet losses. View full abstract»

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  • Joint performance of cells election/reselection and soft handover in the downlink direction of 3G WCDMA systems

    Publication Year: 2003 , Page(s): 227 - 231
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (364 KB)  

    In this paper, the downlink soft handover gain is analysed in 3G WCDMA systems under three different cell selection (CS) schemes. Results show that the performance of the soft handover depends closely on the cell selection scheme. With the distance-based CS, the soft handover gain is overestimated; with the ideal CS, soft handover gain is underestimated. View full abstract»

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  • Intra- and inter-cell interference mitigation algorithms for high-speed downlink packet access in UTRA-TDD

    Publication Year: 2003 , Page(s): 369 - 373
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (435 KB)  

    Two closely related iterative receivers for mitigation of both intra- and inter-cell interference are considered for HSDPA in UTRA-TDD. The first receiver is based on coherent detection with pre-whitening with respect to the spatio-temporal structure of the interference. The second receiver is based on interference suppression via deterministic least-squares filtering. The performance of the receivers is evaluated via system-aware link-level simulations of 2-cell indoor and 7-cell urban scenarios. Performance improvements over the conventional RAKE receiver are reported in the form of BER statistics. View full abstract»

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  • Design considerations for high-data-rate UMTS FDD user equipment

    Publication Year: 2003 , Page(s): 343 - 347
    Cited by:  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (468 KB)  

    The maximum data-rate specified in 3GPP Release 99 is 2 Mbit/s. Recently, 3GPP has issued the first set of Release 5 specifications which, amongst other features, define high-speed data packet access (HSDPA). Key drivers for the HSDPA technology are higher peak and aggregate data rates and reduced delay obtained by means of adaptive modulation and coding (AMC), fast scheduling at the node B and hybrid automatic repeat request (HARQ). A 16-QAM modulation scheme has been introduced which implies that the receiver may require an equaliser. The receiver complexity increases significantly and presents a challenge for a handset manufacturer to achieve the required performance within the economic constraints imposed by the current technology. This article addresses and discusses the design challenges from a user equipment (UE) and test mobile (TM) manufacturer perspective, and presents novel results supporting the design choice. View full abstract»

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  • Pilot-symbol-aided 16QAM with selection diversity over frequency-selective Rayleigh fading channels

    Publication Year: 2003 , Page(s): 446 - 450
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    This paper compares the effectiveness of three selection diversity reception schemes on the bit-error-rate (BER) performance of a PSA-16QAM system over frequency-selective Rayleigh fading channels. The first selection scheme is based on the fading distortion information on the received pilot symbols, the second scheme is based on the signal strength of the received pilot symbol and data symbols, and the third scheme is based on the energy of the received pilot symbol and data symbols. Computer simulation results have shown that the three selection schemes have very similar BER performance in most of the tested conditions. View full abstract»

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  • The path to beyond 3G systems: strategic and technological challenges

    Publication Year: 2003 , Page(s): 299 - 303
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (455 KB)  

    This paper highlights the reasons why we need more proactive approaches linking both strategic and technological challenges for evolution of 3G and even systems beyond 3G (B3G) systems and in which time period it may be deployed and finally what the new system after 3G is. From the previous experiences gained in 2G and 3G for wireless communications, it is obvious that both strategic and technological challenges play a significant role for the success of the future wireless systems. View full abstract»

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  • System level performance of WCDMA with radio over fibre access network

    Publication Year: 2003 , Page(s): 338 - 342
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (350 KB)  

    In this paper, the system-level performance of WCDMA with radio-over-fibre (RoF) access network is investigated. This paper aims at addressing issues such as coverage and transmit power reduction during macrodiversity. The simulation results demonstrate that, for a given service, the transmit power reduction is up to 50% (depending on the channel model and the mobile speed) in the case of the RoF technique as compared to the wireless link. View full abstract»

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  • An architectural framework for a 'carrier class mobile Internet'

    Publication Year: 2003 , Page(s): 194 - 199
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (537 KB)  

    This invited paper considers an architectural framework for a 'carrier class mobile Internet'. This framework is characterised by a move away from 'mobile access' (as advocated by the 3rd Generation Partnership Project ≑PP) or 'edge mobility' (as advocated by the Internet Engineering Task Force - IETF) to one where mobility can be found everywhere. In one sense it may be called 3.5G or 4G. This new architectural framework is based upon IETF protocols and is constructed in a way that separates the concerns of access, core and services; it is also underpinned by an effective quality management system necessary to meet carrier requirements. This architectural framework is based upon the author's extensive experience working on the development of the Internet including his technical leadership of the Mobile Wireless Internet Forum (MWIF) and a contributor to the IETF. View full abstract»

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  • An investigation of WCDMA inter-operator adjacent channel interference

    Publication Year: 2003 , Page(s): 149 - 155
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (417 KB)  

    OrangeUK has had an operational WCDMA trial network in Bristol since April 1999 and was the first operator within Europe to make live 3G video calls. Using its Bristol trial network OrangeUK has performed many tests to verify the performance of a WCDMA network. One such series of tests performed has been to study the possible effects of adjacent channel interference between WCDMA operators also commonly know as the "deadzone" phenomenon. This paper begins by explaining the theory behind uplink and downlink deadzones and then goes on to explain the tests performed on Orange's experimental network and the results obtained from these tests. From these results the paper proposes a number of measures both operators and vendors should take to avoid deadzones in an operational WCDMA network. View full abstract»

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  • Future service capabilities offered by the 3GPP system

    Publication Year: 2003 , Page(s): 354 - 358
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (387 KB)  

    This paper gives an overview of some of the services that it will be possible to offer in the future to mobile users by combining a number of service capabilities specified by 3GPP the international standards setting body. Using the capabilities defined in the Release 5 set of specifications completed in 2002 as well as those that will be available with Release 6, the network operators will be able to deploy a large number of data services that are now only accessible via the Internet with the added value of mobility, security, trusted relationship, solid charging principles, and interoperability that are typical of the mobile environment. Those services will leverage on the IP multimedia core network subsystem (IMS) that brings the benefits of the session initiation protocol and IP technology to the mobile world, user related data stored in the network, a totally new air interface providing controlled quality of service and high throughput and so on. The IMS and its role in the development of services is described. Other service capabilities including presence, group management, push are then discussed. Finally we give some examples of services that combine the above service capabilities. View full abstract»

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  • Is emulation enough?

    Publication Year: 2003 , Page(s): 134 - 138
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (437 KB)  

    Application developers developing 3G applications need to have a clear idea how the system works to provide sufficiently flexible debugging tools to be able to diagnose problems in the field. Once the application is working within an emulator the developers should move to a simulator to ensure that the application operates within the constraints presented by a network. Once the application responds correctly in this environment, it should be put onto the real devices and tested on a dedicated test network where the operational environment can be controlled and where disruptive tests can be performed. Finally the application developer can move the application to a commercial network. In this paper we give a description of a pragmatic application development process using all available tools to make application development as painless as possible. In particular we discuss the use of dedicated test networks such as those in Adelaide, Australia and Cambridge, UK as examples of independent test networks for application developers who have yet to be able to establish a contract with a network operator. Applications can be showcased on these networks as well. View full abstract»

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  • Performance analysis of in-building FDD deployment using measured data

    Publication Year: 2003 , Page(s): 167 - 172
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (417 KB)  

    This paper illustrates a performance analysis for indoor FDD deployments in a business environment using measured path loss data and realistic user deployments. Distributed antenna systems were used to provide the necessary coverage. The analysis involved the interface of path loss maps to a Monte Carlo type simulator. User terminals (UE) were randomly distributed within the indoor environment. Uniform user distributions as well as specific hotspots were investigated. Several mobility scenarios were employed, involving both static and mobile users. The simulation results show: (a) coverage plots with probability of coverage at each location; (b) supported capacity; (c) transmit power distributions; (d) inter-cell and intra-cell interference distributions; and (e) path loss distributions for the served UE. This type of analysis is of significant value in optimising the performance of UMTS networks, by identifying dead zones, gauging sensitivity to network parameters and assessing the impact of the mobility conditions. View full abstract»

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  • Investigation of high-resolution DOA estimation algorithms for optimal performance of smart antenna systems

    Publication Year: 2003 , Page(s): 460 - 464
    Cited by:  Papers (8)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (371 KB)  

    High-resolution signal processing for broadband wireless communications employing smart antenna arrays is associated with high costs, both in terms of hardware and computational complexity. This paper presents a performance evaluation of robust and high-resolution direction-of-arrival (DOA) estimation algorithms used in the design of smart antenna systems. A comparative study is carried out by evaluating the performance of these DOA algorithms for a set of input parameters that include the size of the sensor array, number and angular separation of incident signals from the mobile terminals, as well as noise characteristics of the mobile communication channel. Performance improvement in DOA estimation is demonstrated for certain range of input parameters and the results of the numerical experiments are used to set the criteria for optimal performance of the smart antenna system. View full abstract»

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  • Efficient implementation of space time coding for broadband wireless communications

    Publication Year: 2003 , Page(s): 374 - 378
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (362 KB)  

    This paper presents an efficient implementation of space-time coding for broadband wireless communications. A user-friendly menu-driven space time (ST) trellis coding simulator with a graphical user interface (GUI) is developed. The simulator is used to predict the improved performance and diversity gains of a ST coding system through a number of parameters including type of trellis codes and channel fading. Results are presented to demonstrate the versatility of the developed simulator for predicting the performance of a ST coding system under different coding and channel conditions. View full abstract»

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  • Evolution of the UTRAN architecture

    Publication Year: 2003 , Page(s): 244 - 248
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (379 KB)  

    In this paper, we discuss possible evolution scenarios for the UMTS Terrestrial Radio Access Network (UTRAN) beyond 3GPP standards Release 5. The current UTRAN has inherited its centralised network architecture with a quite complex central radio network controller (RNC) and simple base stations (called "NodeB" in UMTS) from the 2nd generation GSM system. Fifteen years ago, this basic architecture was designed for GSM to provide wireless access to the circuit-switched, voice-oriented telecommunications network (PSTN). Though in the meantime, the network architecture has been extended to packet data services (General Packet Radio Service GPRS), the rise of the Internet and its different service requirements have not been reflected adequately. With standards Release 5 in 3GPP UMTS, as a first step towards a stronger Internet orientation, IP transport shall replace the ATM-based links between RNC and NodeB. However, the full advantage of IP transport cannot be realised, because of the unchanged characteristics of the interface that requires to carry synchronised radio link blocks with a high quality of service, regardless of the user-service to which they belong. To overcome this drawback and to enable real service differentiation, some modifications of the 3GPP Rel. 5 architecture have been investigated. Preserving the Iu interface between UTRAN and core network, the proposed architecture can take full advantage of the IP-based protocols in the transport network. In addition, it offers improved scalability due to its separation of control and user-plane. View full abstract»

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  • Capacity effects of the WCDMA 2.5 GHz DL due to UE-UE interference

    Publication Year: 2003 , Page(s): 314 - 318
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (391 KB)  

    WRC-2000 has identified additional bands 806-960 MHz, 1710-1885 MHz, and 2500-2690 MHz for possible use by IMT-2000 systems. In relation to 2.5 GHz band (2500-2690 MHz), ITU-WP8F has defined seven possible scenarios for the frequency arrangements. These scenarios include the operation of FDD DL only, paired FDD UL/DL or TDD or combinations of them at the 2.5 GHz band. This study focuses on one of the ITU 2.5 GHz band (2500-2690 MHz) scenarios, i.e. paired FDD UL/DL + additional FDD DL operation at 2.5 GHz band. The additional DL band is paired with UL operation in some other frequency band, e.g. the UMTS core UL band. However, the FDD UL/FDD DL frequency border creates new interference scenarios. View full abstract»

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  • Exploiting emerging tools in short range wireless technologies

    Publication Year: 2003 , Page(s): 348 - 353
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (443 KB)  

    This paper seeks to explore the benefits that could be obtained from the application of Bluetooth, IEEE 802.11 successors and packet based wireless technologies in two distinct areas of electricity utility operations: enhanced automatic meter reading (AMR) and cost effective monitoring of electrical supply continuity in low voltage electrical distribution networks. View full abstract»

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  • Performance evaluation of MPEG-4 video telephony over UMTS

    Publication Year: 2003 , Page(s): 73 - 77
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (430 KB)  

    UMTS access networks can provide a wide range of bearer services with different levels of quality of service suitable for multimedia applications with bit rates of up to 2 Mbit/s. These multiple services are managed by use of composite transport channels, each having static and semi-static transport channel parameters such as transport block size, CRC code length, channel coding schemes, RLC mode, MAC type, transport time interval, rate matching and spreading factor. The perceived quality of the application seen by the end user is greatly affected by the settings of these radio access parameters. The paper examines the effects of these network parameter settings on the performance of real-time video communications by simulating MPEG-4 coded video transmission over a UMTS multimedia evaluation test bed. It investigates the optimal radio bearer design for real-time video transmission over UTRAN (UMTS terrestrial radio access network). View full abstract»

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  • Orange UK WCDMA field trials overview

    Publication Year: 2003 , Page(s): 384 - 389
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (483 KB)  

    OrangeUK has had an operational WCDMA trial network in Bristol since April 1999 and was the first operator within Europe to make live 3G video calls. Using its Bristol trial network OrangeUK has performed many tests to verify the performance of a WCDMA network. At the time of writing only one UK operator has officially launched 3G services although it could be argued that all five UK 3G operators are still in the trials-phase of WCDMA network operation. As with any new technology Orange realises the benefits of extensive trials before commercial operation and has therefore been performing trials with its multi-layered Nokia trial network in Bristol for over 2 years. This paper gives an overview of this network and highlights some of the tests performed to date. View full abstract»

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  • Congestion control of circuit switched services in 3rd Generation Radio Access Networks using time-window based pre-emptive algorithms

    Publication Year: 2003 , Page(s): 319 - 322
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (341 KB)  

    Congestion control in 3rd Generation Radio Access Networks (3GRAN) can be achieved for packet switched (PSW) service by using fast transport-format control services at the medium access control (MAC) layer, which reduces the bit-rate during congestion to ameliorate the situation. However, for circuit switched (CSW) services such transport-format control is not possible, thus the only way to mitigate congestion is to preempt or abort connections. One form of congestion control is already inherent in the Universal Terrestrial Radio Access (UTRA), where CSW services are dropped when in outage for a long contiguous period. More innovative congestion control algorithms can be implemented at the call admission control (CAC), which may result in improved performance. One such algorithm is presented in this paper that has shown to increase CSW service performance in the midst of congestion. View full abstract»

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  • The economic impact of malicious code in wireless mobile networks

    Publication Year: 2003 , Page(s): 1 - 6
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (468 KB)  

    The paper presents the findings from a study conducted by Mercer Management Consulting into wireless threats. The paper examines wireless technologies and the vulnerabilities that these new technologies bring. It also investigates current and future wireless threats and the reasons why malicious code will spread within wireless environments. Lastly it examines the potential damage, economic impact and critical factors for stopping wireless attacks. View full abstract»

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  • The effect of channel estimation errors on RAKE receiver performance in WCDMA systems

    Publication Year: 2003 , Page(s): 183 - 187
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (398 KB)  

    The performance of a RAKE receiver in a mobile terminal is analysed for a WCDMA downlink. Bit error rates as a function of signal-to-noise ratio are computed for the case when channel estimates are in error as a result of self-interference due to multipath propagation and thermal noise. Channel estimation errors are described using Gaussian approximations for interference and noise, while the effects of self-interference on the data are computed exactly. Results are compared with the case when the receiver has perfect channel knowledge and used to determine a threshold for RAKE finger selection in practical systems. View full abstract»

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  • Evolution to 3G services: provision of 3G services over GERAN (GSM/EDGE radio access network)

    Publication Year: 2003 , Page(s): 78 - 82
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    The first 3G systems are being installed, and coverage maps are showing that there are significant areas of the UK where some 3G services will not be supported. Thus, a mechanism must be provided for the future that allows operators with combined 2.5G and 3G networks to be able to provide common services regardless of the users location. Within TSG GERAN, work has been ongoing for a number of years in order to meet the QoS criteria required for 3G services within 3GPP, and the paper provides an insight into the benefits and problems of competing solutions. Two solutions are described which offer a choice between a revolutionary and evolutionary upgrade path to support 3G services over a GERAN network. It is not suggested that GERAN will replace UTRAN, but that it may lessen the deployment costs, and provide a more economically appropriate method for providing 3G services in the short to medium term. View full abstract»

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  • Improving hard handover in HBR IP micro mobility access networks employing tree based topologies

    Publication Year: 2003 , Page(s): 200 - 204
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (459 KB)  

    In IP based wireless access networks, the flow of packets to the mobile host (MH) is diverted at the cross-over node (CoN) to the new location of the MH in order to reduce handover delay and packet loss. As the depth of the network increases so does the round trip time to the CoN, in the worst case this is the time to the gateway or root node of the domain. This paper proposes an architectural modification to micro mobility protocols employing virtual or static tree topologies such as cellular IP (CIP). We propose an architectural extension to the path update process by adding multi-homed base stations (MHOBS) at certain points in the wireless access network where the path update delay becomes severe. There are two situations where this may arise. The first is where the path update is due to a distant gateway, or other CoN, as a result of an increase in the depth of the topology. The second situation is more likely to arise, with virtual tree topologies on mesh networks, when the new path, between new base station (BS) and the CoN, is longer than the old path to the old BS. The path update minimization proposed here eliminates the effect of path update delay at these points in the network, and consequently reduces packet loss due to the handover process. View full abstract»

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  • On adaptive reduced complexity soft output equalization for EDGE

    Publication Year: 2003 , Page(s): 465 - 469
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (429 KB)  

    An adaptive soft output equalizer structure of moderate complexity, which involves the BCJR maximum a posteriori (MAP) is proposed to mitigate the adverse effects of a fast time-varying frequency selective fading channel such as the case of a high speed train for EDGE modulation. For practical low complexity implementation, the delayed decision feedback sequence estimation (DDFSE) is applied and using per-survivor processing (PSP), the channel derived parameters, which the soft output equalizer depend on for delivering soft values, are jointly updated. The sub-optimum soft-output algorithm (SSA) is also considered as another reduced state soft output option to MAP but at the expense of sub-optimality. For further complexity reduction, the reduced state sequence estimation (RSSE) technique is applied and the overall complexity of the joint scheme is effectively reduced as parameter update is carried out with a smaller trellis. Combining the PSP with reduced state soft output algorithms, adaptive soft output extensions of various complexity are proposed for EDGE. The results suggest an adaptive 2 state MAP is sufficient and capable of supporting mobiles of high vehicular speeds that exceeds EDGE requirements. View full abstract»

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