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All Journal Majalah Ilmiah Teknologi Elektro
Dewi Wirastuti
Universitas Udayana
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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WIRELESS TECHNOLOGIES for LOCATION-BASED SERVICES Dewi Wirastuti
Jurnal Teknologi Elektro Vol 11 No 1 (2012): (January - June) Majalah Ilmiah Teknologi Elektro
Publisher : Program Studi Magister Teknik Elektro Universitas Udayana

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This paper presents an overview of wireless technologies that support location-based services (LBS). Satellite and cellular networks have exploited their communication infrastructure to offer LBS. The rapid deployment of mobile broadband wireless networks has offered another appealing application area. Key to the realisation of LBS is an efficient and accurate positioning technique with various methods and offering different performance levels. So far, Global Positioning System (GPS) has offered the best accuracy at a low cost but it is challenged by poor indoor coverage. With the rapid deployment of broadband wireless access ubiquitously, Mobile WiMAX (Worldwide Interoperability for Microwave Access) is seen as a potential positioning option for LBS. Some key features of WiMAX, i.e., broadband benefit, high speed and large coverage area; it will be exploited to provide LBS.
AN OVERVIEW OF UMTS AND WIMAX NETWORKS INTEGRATION Dewi Wirastuti
Jurnal Teknologi Elektro Vol 9, No 2 (2010): (July - December) Majalah Ilmiah Teknologi Elektro
Publisher : Program Studi Magister Teknik Elektro Universitas Udayana

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This paper gives an overview of the network integration of UMTS (Universal Mobile TelecommunicationSystem) with WiMAX (Wordwide Interoperability of Microwave Access). A few proposed interworking solutionsand seamless integration of both networks are explained. The best architecture and key procedures that will enablethe integration both networks and handover mechanism for the seamless mobility are presented. Considering thetrend of the current network evolution, which is the convergence between the telecommunications and broadcastworlds, an integration of mobile WiMAX with present 2G, 2.5G or 3G accesses into a homogeneous architecturegoes a long way to achieve the reality of mobile broadband networks. With the advent of mobile WiMAX, a mobilebroadband wireless access solution and based on all-IP (Internet Protocol) based OFDMA (Orthogonal FrequencyDivision Multiple Access) technology, an UMTS-WiMAX
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