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Personal Communications, IEEE

Issue 3 • Date June 2000

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Displaying Results 1 - 6 of 6
  • The Global System for Mobile Communications Short Message Service

    Page(s): 15 - 23
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1014 KB)  

    This tutorial presents an overview of the Global System for Mobile Communications Short Message Service from the viewpoint of implementing new telematic services. The SMS offers the users of GSM networks the ability to exchange alphanumeric messages up to the limit of 160 characters. The tutorial is motivated by an acute absence of research publications in this field. The information gathered in the tutorial was required considering the increasing potential SMS offers for integration with existing messaging services and its ability to offer a successful replacement for the transmission control and Internet protocols as far as low-bandwidth-demanding applications are concerned. Initially, the tutorial gives an overview of the building blocks of GSM networks-the mobile station, base station, and network subsystem-and then emphasizes the SMS network and protocol architecture. The most widely used protocols for message submission are then introduced (text-based, SMS2000, ETSI 0705, TAP) and compared in terms of features provided and flexibility to handle extended alphabets or two-way messaging. Finally the tutorial outlines a summary of current and future issues for further development and research in the light of novel features for submission protocols and telematic services. View full abstract»

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  • A comparative evaluation of DECT, PACS, and PHS standards for wireless local loop applications

    Page(s): 35 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (856 KB)  

    In a comparative analysis the performance and capacity of DECT, PACS, and PHS for WLL applications have been investigated. This article reports the results of both qualitative and quantitative analysis. The qualitative evaluation consists of a detailed comparison of the parameters of each standard and their relevance in WLL applications. In the quantitative analysis detailed simulations have been performed covering diversified sets of conditions. The results of both types of analysis are presented. A major conclusion is that all three standards provide satisfactory performance for WLL applications. For low-traffic environments PACS, which can employ larger cells, performs better than the other two standards. In suburban areas where, in addition to coverage, capacity is an issue, DECT has better performance. For high-traffic-density urban areas with great capacity requirements all three standards have good performance. View full abstract»

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  • Mobile prepaid phone services

    Page(s): 6 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (660 KB)  

    During the past few years, the mobile prepaid service has been growing exponentially all over the world. Four approaches have been proposed to provide mobile prepaid service. We describe these approaches and compare their strengths and weaknesses. Our analysis indicates that the handset based approach is a low-cost, high-risk solution. The wireless intelligent network approach is a high-cost, low-risk solution. The service node approach is a quick solution, which allows fast deployment with limited capacity. The hot billing approach is an average solution that cannot provide real-time rating View full abstract»

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  • UMTS W-CDMA: evaluation of radio performance by means of link level simulations

    Page(s): 42 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (896 KB)  

    This article presents link level simulation results for the FDD component of UMTS, based on the W-CDMA access technique. Simulation results are given for different service classes: 8 kb/s voice, 144 kb/s circuit-switched data (LDD), and 480 kb/s packet-switched data (UDD). The performance is given in terms of the bit error rate and block erasure rate. Results are provided as a function of the Eb/N 0 ratio and the mobile speed in four different propagation channels defined by the ETSI and ITU-R View full abstract»

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  • Data detection techniques for DS/CDMA mobile systems: a review

    Page(s): 24 - 34
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (812 KB)  

    As system requirements in terms of the BER performance and capacity increase, so will the need for more advanced detection techniques. The application of advanced receiver structures is optional for phase 2 of the UMTS FDD mode, while it is mandatory for the time-division duplex mode. Layer 1 of both modes is based on wideband direct sequence code-division multiple access technology, where a physical channel is characterized by the code, frequency, and, in the uplink, the relative phase (I/Q). Furthermore, in the TDD mode the physical channel is also characterized by the time slot (TDMA component) View full abstract»

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  • Precision of the estimation of area coverage by planning tools in cellular systems

    Page(s): 50 - 53
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (292 KB)  

    Coverage prediction in modern cellular systems is usually performed with the aid of a planning tool, using a suitable elevation and terrain digital model (i.e., a database of heights and land usage) and algorithms that estimate basic path loss plus additional diffraction loss. These algorithms produce a mean field strength estimation on a pixel-by-pixel basis, and the tool can then compute the percentage of coverage of a given territory (e.g., national or regional). Because of errors by the field estimation algorithm, this number has an associated degree of uncertainty as well, which is calculated in this study. This is done starting from the statistical distribution of the estimation errors; based on an analysis of the nature of the estimation process, a statistical distribution for errors on a cell-by-cell and wide-area basis is then derived. Okumura-type estimation algorithms are considered in the study, tuned with the aid of measurements. Constant reference is made to field experience, since the measurements considered here and the knowledge of the capabilities and limits of planning tools derive from Omnitel's two-year monitoring experience in this area View full abstract»

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Aims & Scope

This Magazine ceased publication in 2001. The current retitled publication is IEEE Wireless Communications.

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