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3G Mobile Communication Technologies, 2001. Second International Conference on (Conf. Publ. No. 477)

Date 26-28 March 2001

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Displaying Results 1 - 25 of 85
  • Its services in Wales using the Wireless Application Protocol (WAP)

    Publication Year: 2001 , Page(s): 44 - 46
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (279 KB)  

    This paper describes the UK site of the ITSWAP project which is developing ITS services using the Wireless Application Protocol (WAP). The site is situated in Wales and includes several key features aimed at improving travel using the potential of the WAP. ITS services being implemented in Wales include pre-trip traveller information, journey planning, route planning, tourist information, on-trip driver information, route guidance (including dynamic updates en route), and floating car data. The basis for the real-time traffic information is the M4NTAIS Cymru database operated by the National Assembly for Wales. View full abstract»

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  • Packet loss rate estimation in a packet switched voice cellular network

    Publication Year: 2001 , Page(s): 282 - 286
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    In this paper two analytical methods for the fast calculation of the packet loss probability in voice cellular networks are provided. Packet loss has significant impact on voice quality and therefore is an important factor (together with co-channel interference) in capacity dimensioning in wireless networks. The first method is based on the so-called “effective bandwidth” concept. Our second method is based on large deviation theory, in particular, the Bahadur-Rao theorem, and provides a refinement to the effective bandwidth based estimation. Both methods are computationally efficient and much faster than the exact analysis based on the fluid flow model. Numerical results are presented to verify the accuracy of the proposed approaches. It is shown that the Bahadur-Rao approximation is more accurate than the effective bandwidth approach View full abstract»

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  • Performance of a OTDOA-IPDL positioning receiver for 3GPP-FDD mode

    Publication Year: 2001 , Page(s): 221 - 225
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (484 KB)  

    Location services (LCS) are gaining increasing commercial interest in the mobile communications industry, with exponential growth predicted for the next decade. The capability of finding the accurate position of a mobile phone is one of the features that will help third generation (3G) systems in reaching a wide success triggering a high number of innovative interactive applications. This paper gives an overview of algorithms for positioning a mobile phone using 3GPP-FDD mode signals. The OTDOA-IPDL mechanism is detailed, and implemented in a typical simulation scenario. The performance of the system is evaluated in different environments, showing the severe effects of multipath over the radio link View full abstract»

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  • Simulated performance of the HIPERLAN/2 physical layer with real and statistical channels

    Publication Year: 2001 , Page(s): 407 - 411
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    HIPERLAN/2 is a European-standard high-speed wireless local area network (WLAN) operating in the 5 GHz band. In order to support broadband multimedia communications, it can provide data rates up to 54 Mbps. The HIPERLAN/2 standard specifies a flexible radio-access network that can be used with a variety of core networks, including UMTS. It is likely that HIPERLAN/2 will become an important complementary technology to 3G cellular systems, typically used for `hot-spot' coverage. In this paper, the use of HIPERLAN/2 in conjunction with UMTS is discussed. Software-simulated physical layer performance results are presented and an evaluation given of the impact of the use of sectorised antennas at access points. Results are shown for statistical channel models and real channel measurements taken in both indoor and outdoor environments in the 5 GHz band View full abstract»

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  • Performance characteristics of the Enhanced General Packet Radio Service for the mobile Internet access

    Publication Year: 2001 , Page(s): 287 - 291
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (404 KB)  

    The performance characteristics of the Enhanced General Packet Radio Service (EGPRS) with the focus on radio network dimensioning for the mobile Internet access are presented. The impact of the new modulation and coding schemes (MCSs) and the related link quality control (LQC) functions defined in the EGPRS specifications on the overall system performance and the quality of service (QoS) for the non-real-time Internet applications, WWW and electronic mail is examined. To achieve this, simulation results for EGPRS performance and system measures for different load situations are produced with the simulation tool GPRSim that models the traffic behaviour of an EGPRS network View full abstract»

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  • An open digital interface between SDR baseband processors and RF

    Publication Year: 2001 , Page(s): 311 - 316
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (540 KB)  

    Presents an open, digital interface-OpenIFTM-designed by RadioScape Ltd., which enables high speed control and user data to be sent between front-end, RF processing units, and back-end, generic signal processing components, for use within base station, test and prototyping products. The adoption of such an interface is central to the success of software defined radio (SDR), both as a design-time and run-time technology, as it enables the production of analogue/RF components independently from the digital domain hardware and software. OpenIFTM utilises the user datagram protocol over IP (UDP/IP) to carry information. The configuration of RF hardware is realised using the simple network management protocol (SNMP), as many different technical specifications can be represented as a standard set of messages coupled with a small set of application specific messages built from the standard set. Because the interface is open and extensible, the overall system architecture need not be changed when processing different communications or broadcast standards. The interface is decoupled from any underlying physical layer (although a particular variant, LVDS, is described here). RadioScape has used the OpenIFTM interface in its generic baseband processor (GBP) platform, a FPGA/DSP substrate for high-bandwidth digital processing. Having found the interface extremely useful internally, we present it here for consideration by the rest of the industry. This paper aims to give the reader a broad overview of the OpenIFTM interface and is not a standardisation document or proposal View full abstract»

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  • Provision of streaming media services over mobile networks

    Publication Year: 2001 , Page(s): 104 - 108
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    The 3G family of mobile communication standards specifications describe a streaming media service class designed for the provision of non-delay critical multimedia services. This paper describes the performance of streaming audio and video services over EGPRS (Enhanced General Packet Radio Service) networks under different network and channel conditions. Enhancements to the EGPRS radio link control mechanisms are proposed, and the resulting quality improvements of the received media streams are examined View full abstract»

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  • Authors' Index

    Publication Year: 2001 , Page(s): xvii - xix
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (112 KB)  

    First Page of the Article
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  • Recursive filtering approach to MS locating using quantized to a measurements

    Publication Year: 2001 , Page(s): 206 - 210
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    A mobile station (MS) location estimation and tracking approach based on the recursive filtering of quantized time-of-arrival (TOA) measurements is presented in this paper. Two techniques for estimating random variables from quantized measurements are investigated first. The TOA measurements may present biases which are unobservable and can determine the location filter to obtain a biased estimate while the location error covariance will be underestimated. The proposed location filter, GF-SKF, combines a Schmidt-Kalman (1960) filter (SKF) with the Curry's (1970) “Gaussian fit” (CF) scheme. The measurement biases are considered in the SKF model only through the effect of their covariances on the location error covariance. The GF scheme is meant to accommodate the quantized measurements in the filter model. A measurement noise covariance estimation method is described and a simple technique for alleviating the influence of the non-line of sight (NLOS) range errors over the state estimate is specified. Simulations with GF-SKF show a reasonable accuracy which depends on the quantization step View full abstract»

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  • QoS support in 4th generation mobile multimedia ad hoc networks

    Publication Year: 2001 , Page(s): 412 - 416
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    This paper addresses the problem of supporting real-time communications in a multihop mobile network using QoS routing, and presents evaluation results on the QoS routing model proposed by Aggelou (see Ph.D. Thesis, University of Surrey, 2001). In the performance experiments, we consider multimedia traffic flows with different QoS types and examine the system performance in various communication environments View full abstract»

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  • A new demixer scheme for blind source separation using general neural network model

    Publication Year: 2001 , Page(s): 383 - 386
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    There has been a surge of interest in blind source separation (BSS) because of its potential applications in several areas of engineering and science such as wireless systems. We propose a new neural network demixing scheme using a general neural network structure for the BSS problem for the instantaneous mixtures. It is shown that the existing feedforward (FF) and feedback (FB) neural network schemes can be reduced from the new general model. The results demonstrate that the new scheme is more robust and offers superior convergence properties View full abstract»

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  • Designing a diffserv-capable IP-backbone for the UTRAN

    Publication Year: 2001 , Page(s): 47 - 52
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (416 KB)  

    Due the growing popularity and availability of IP-devices and IP-transport, and given the evolving standardisation, it is clear that IP-transport will be one of the transport mechanisms in the UMTS Terrestrial Radio Access Network (UTRAN). Most studies until now have concentrated on studying the impact of IP-transport on the `last mile', and have demonstrated that is a viable alternative transport on the last mile. Introduction of IP-transport in the UTRAN, however, has a broader scope than the last mile alone. Also the rest of the UTRAN has to be taken into account, and in particular the IP-backbone interconnecting the mobile network elements. This article demonstrates that the mechanisms exist to fulfil the requirements imposed by an IP-based UTRAN backbone with reasonable characteristics of the backbone, the elements it is composed of and the resources this requires View full abstract»

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  • Wireless location with NLOS error mitigation in Korean CDMA system

    Publication Year: 2001 , Page(s): 134 - 138
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (324 KB)  

    In this paper some wireless location experiments using CDMA pilot channels are carried out and an estimation technique to improve its positioning accuracy is proposed. Together with the GPS (global positioning system), lots of positioning technologies using existing infrastructure, that is, mobile communication networks, are being researched. Because of the shortage of hearable signals, multipath, and NLOS (non-line-of-sight) error, however, CDMA positioning has low positioning accuracy by raw pilot measurements only. In this paper, we introduce an adequate two-stage filter to treat such path-loss errors and develop a path-loss error mitigation algorithm. We apply these to the real positioning system and carry out experiments in the dense urban area. Friedland (1969) proposed the optimal filter to reject unknown bias that is difficult to be estimated. This paper shows a design rule that the filter can be applied to CDMA location and make the positioning accuracy better View full abstract»

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  • IPv6 on everything: the new Internet IPv6 helps network architects address the IP address shortage, security, QoS, multicast and management

    Publication Year: 2001 , Page(s): 317 - 322
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (560 KB)  

    Ipv6 helps network architects revisit fundamental IP-related issues such as IP address shortage, security, quality of service, mobility, multicasting, and network management. In 1977, Dr. Vint Cerf (Senior Vice President of Internet Architecture and Engineering at MCI WorldCom, and an Internet pioneer credited as being the father of the Internet) confidently asserted that “32 bits should be enough address space for Internet”. Today, as honorary chairman of the IPv6 Forum, Dr. Cerf calls for the immediate adoption of IPv6, in order to “take the Internet where no other network has gone before”. The author describes how Ericsson Telebit, through its sound pioneering strategy regarding IPv6 technology and marketing, has facilitated the creation of the IPv6 Forum, thereby addressing the critical limitations of the current Internet security, quality of service and address space, and building robust foundations for the new-generation Internet View full abstract»

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  • First step toward an IP-based VHE

    Publication Year: 2001 , Page(s): 196 - 200
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    The Virtual Home Environment (VHE) appears as a key concept for the 3rd generation mobile networks such as the Universal Mobile Telecommunication System (UMTS). It promises mobile users the ability of accessing a large range of personalized services, whatever the location or the terminal. In fact, it allows the global service portability! Among other services, Internet/intranet applications are of course attractive targets. In parallel to the works on the VHE realization, the ongoing studies in the different standardization bodies (3GPP, 3GPP2, MWIF, IETF, 3GIP) indicate that the future telecommunication systems will be IP-based. If SIP and H.323 are natural candidates for voice over IP (VoIP) applications, Mobile IP could play an important part for the mobility management in those new generation networks. This IETF protocol allows transparent routing of IP datagrams to mobile nodes in the wide Internet. The purpose of this article is to describe the P920 VHE trial and how Mobile IP can be used as the mobility management protocol for an All-IP network, to offer a Web-based VHE and seamless services across different access networks (fixed LAN, WLAN, cellular, etc.). First, we give an overview of Mobile IP and the P920 vision of the VHE concept is then presented View full abstract»

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  • MPEG-4 video transcoder for mobile multimedia traffic planning

    Publication Year: 2001 , Page(s): 109 - 113
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    Traffic planning for multimedia has become more and more significant as new network infrastructures with different characteristics have been introduced lately. The increasing popularity of mobile communications has also drawn much of the attention from the research point of view. Thus, this paper addresses the problem of traffic planning, initiated by this interest, for mobile video communications and proposes a video transcoder bank to resolve congestion and/or bandwidth limitation. The proposed architecture presents a layered structure of multiple video rates as required by various networks. Moreover, the paper also introduces an adaptive method for resolving congestion. The designed system monitors the congestion with a feedback loop within a network and adaptively produces necessary transmission rates whilst providing the best available service quality View full abstract»

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  • System performance of multi-sector smart antenna base stations for WCDMA

    Publication Year: 2001 , Page(s): 1 - 6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (656 KB)  

    In this paper, a novel approach is proposed for system level simulation of both beamforming and diversity antennas for WCDMA base stations. In order to obtain more accurate system level performance, the proposed approach takes into account semi-analytical link level characteristics of beamforming and diversity antennas. By including link level parameters such as multiple diversity branches, sectorisation gain pattern, power control algorithms together with several beamforming algorithms, the proposed system level simulator enables the system level optimisation of capacity. Capacity comparisons between several antenna configurations are presented for both uplink and downlink View full abstract»

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  • Cell dimensioning under general user mobility

    Publication Year: 2001 , Page(s): 166 - 170
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    Although, all the users within a cellular network are not stationary, the current cellular network design has as the fundamental assumption exactly this immobility of the users, resulting in treating them as their fixed wireline counterparts. However, cellular networks are quite different primarily because of the phenomenon of handover. This paper builds on the assumption of the Poissonian nature of the handover traffic and produces a set of formulae which give the mean number of performed handovers during a call and the mean channel holding time, in order to examine how the cell dimensioning procedure is affected by taking into consideration the mobility of the users. The results show that in general a cell experiences a lower load compared to the stationary load, which means that the stationary assumption results in overestimated traffic. Lastly, a network dimensioning methodology is presented, where moving traffic and mixed (stationary and moving) traffic and also quality of service guarantees for handed-over calls are taken into consideration View full abstract»

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  • A comparison of multiple input radio channel models using geometric and stochastic methods

    Publication Year: 2001 , Page(s): 129 - 133
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (364 KB)  

    We present two types of multiple input channel models that have been implemented: a geometric model and a stochastic model. We consider the relative merits and limitations of these models. There are a number of factors that will indicate whether geometric or stochastic multichannel models are appropriate for a particular test scenario. The advantage of a geometric model is that all of the factors used to characterise the channel (e.g. Doppler spread, delay spread, angle of arrival, etc.) are correlated. The geometric model, by its physical ray tracing nature, automatically implements these artefacts of the signal and can be used in indoor picocells and outdoor macrocells without the need for empirical data. The disadvantage of the geometric model is that it is a simplification of the physical world, and so some of the statistical detail is likely to be lost View full abstract»

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  • Agent-based resource management for 3G networks

    Publication Year: 2001 , Page(s): 236 - 240
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    This paper discusses an architecture for efficient, scalable and robust real time control of 3G mobile systems in the context of realistic business models of network providers, service providers and customers and the relationships between these actors. The aim is to bring financial benefits to mobile users through improved efficiency; extensions to the same approach would allow management of a variety of contingencies with social benefits View full abstract»

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  • Performance assessment of terrestrial and satellite based position location systems

    Publication Year: 2001 , Page(s): 211 - 215
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    The ability to support position location within wireless networks provides network operators with additional value added services, as well as users with a host of new applications. This includes navigation, localisation based services, network management and security applications. With the forthcoming roll-out of 3rd generation wireless networks there is the need to assess the performance of techniques that support position location, when utilising WCDMA as the multiple access technique. This paper presents promising results obtained from a previous performance evaluation of geo-location techniques, focused on 3rd generation cellular networks. The study is built on a measurement campaign in the Universal Mobile Telecommunication System (UMTS) band that took place in the `heavy urban' environment of Bristol, UK. A terrestrial and a Global Positioning System (GPS) based case study are investigated View full abstract»

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  • Performance of SIR-based power control for UMTS

    Publication Year: 2001 , Page(s): 16 - 20
    Cited by:  Papers (8)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (340 KB)  

    The performance of SIR-based closed-loop power control (CLPC) for the W-CDMA UTRA-FDD uplink has been evaluated. The evaluation work has been carried out using the standard deviation of the power control error (PCE) as the performance metric. Two power control algorithms (PCAs) that are currently specified by the 3rd Generation Partnership Project (3GPP) have been simulated in a vehicular environment. The results indicate that the first algorithm outperforms the second for the range of speeds considered. An optimized SIR (signal-to-interference plus noise ratio) estimation scheme is proposed. It is also shown that the multipath diversity gain that is generally observed in the wideband channel can be degraded when combining weak taps View full abstract»

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  • Managing mixed services with controlled QoS in GERAN-the GSM/EDGE radio access network

    Publication Year: 2001 , Page(s): 147 - 151
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (468 KB)  

    Managing multiple services with controlled quality of service (QoS) is crucial to 3rd generation cellular systems. This paper describes and evaluates a simple radio resource management scheme; service-based power setting, employed to accomplish this goal for the GSM/EDGF radio access network (GERAN). Simulation results indicate that with proper power offsets between bearer services previously established high capacities for single services may be maintained also for a mix of different services with controlled QoS View full abstract»

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  • Will service convergence ever happen? A service based method for evolution planning

    Publication Year: 2001 , Page(s): 351 - 354
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (572 KB)  

    The introduction of 3rd generation networks poses new problems to the integration of existing and emerging technologies. At the same time, it will bring about an opportunity for a much sought-after service unification. The new 3G system will create a new “technological centre of gravity” and is likely to function as an aggregator towards service convergence and network integration. Major changes in current architectures will impact the local loop and wireless access, while core networks may undergo a significant shift from circuit to packet switched paradigms. Technology stemming from both the IT and telecommunication worlds will continue to drive the evolution of access, core and service environments. Within this context, operators and service providers will need to plan evolutionary scenarios for their networks and service platforms in order to meet service requirements. Evaluation methods based on objective criteria will assist service convergence design both across networks and through evolutionary states. This paper describes such a method View full abstract»

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  • Semi-blind equalisation for multiple-input multiple-output MC-CDMA

    Publication Year: 2001 , Page(s): 387 - 391
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    This paper presents a semi-blind equalisation scheme for a multi-carrier code division multiple access system (MC-CDMA). The combination of a MC technique (OFDM) and spread-spectrum technique (CDMA) gives rise to an access technique which is robust to channel impairments, relatively low complexity and high flexibility in bandwidth assignment. The technique proposed in this paper uses a blind channel estimation technique assuming previous knowledge of the frequency spreading code of desired user's signal. It makes use of orthogonal transmit diversity and multiple antennas at the receiver, providing diversity gain and immunity to multipath fading and co-channel interference View full abstract»

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