UMTS: targets, system concept, and standardization in a global framework

Rapeli, Juha

doi:10.1109/98.350860

Cited by 127 publications

(19 citation statements)

References 6 publications

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“…T IS A requirement for third generation mobile communications systems, such as UMTS/IMT2000, to be able to offer mobile access to voice, data and multimedia facilities in an extensive range of operational environments [1]. The need for planning these systems underlines the requirement for tools that will be able to provide the critical information to achieve this goal.…”

mentioning

confidence: 99%

A microcellular ray-tracing propagation model and evaluation of its narrow-band and wide-band predictions

Athanasiadou

Nix

McGeehan

2000

IEEE J. Select. Areas Commun.

135

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Abstract-Due to the site specific nature of microcellular operational environments, propagation models are required to take into account the exact position, orientation and electrical properties of individual buildings, and hence, ray tracing techniques have emerged as the dominant methods to predict propagation in such environments. A novel hybrid three-dimensional (3-D) ray tracing algorithm which can evaluate scenarios incorporating many thousands of objects by utilising the concept of "illumination zones," is presented in this paper.In order to evaluate the accuracy of the presented model, comparisons of narrow-band and wide-band predictions with measurements are performed for a variety of scenarios. First, power comparisons show that very accurate predictions can be achieved (rms errors less than 3.7 dB). Then, wide-band analysis shows that since the rms delay spread for systems with finite bandwidth is a function of the multipath phase, only average measured and predicted rms delay spread values can be compared and as a result, limited averaging can produce large rms errors. With sufficient averaging the achieved wide-band accuracy in terms of the predicted rms delay spread, is adequate for most planning purposes.Index Terms-Narrow-band and wide-band radio channel measurements and predictions, propagation modeling, ray tracing.

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mentioning

confidence: 99%

A microcellular ray-tracing propagation model and evaluation of its narrow-band and wide-band predictions

Athanasiadou

Nix

McGeehan

2000

IEEE J. Select. Areas Commun.

135

View full text Add to dashboard Cite

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“…Indeed, by mid 2006 GSM services were used by more than 1.8 billion subscribers 2 across 210 countries, representing approximately 77% of the world's cellular market. It is widely accepted that the third generation mobile telecommunication system (Universal Mobile Telecommunication System or UMTS) [2], will coexist with the enhanced releases of the GSM standard (GPRS [3] and EDGE [4]) at least in the first phases. GSM is then expected to play an important role as a dominating technology for many years.…”

Section: Introductionmentioning

confidence: 99%

Optimization algorithms for large-scale real-world instances of the frequency assignment problem

et al. 2010

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Nowadays, mobile communications are experiencing a strong growth, being more and more indispensable. One of the key issues in the design of mobile networks is the Frequency Assignment Problem (FAP). This problem is crucial at present and will remain important in the foreseeable future. Real world instances of FAP typically involve very large networks, which can only be handled by heuristic methods. In the present work, we are interested in optimizing frequency assignments for problems described in a mathematical formalism that incorporates actual interference information, measured directly on the field, as is done in current GSM networks. To achieve this goal, a range of metaheuristics have been designed, adapted, and rigourously compared on two actual GSM networks modeled according to the latter formalism. In order to generate quickly and reliably high quality solutions, all metaheuristics combine their global search capabilities with a local-search method specially tailored for this domain. The experiments and statistical tests show that in general, all metaheuristics are able to improve upon results published in previous studies, but two of the metaheuristics emerge as the best performers: a populationFrancisco Luna, Antonio J. Nebro, and Enrique Alba Universidad de Málaga, Spain E-mail: {flv, antonio, eat}@lcc.uma.es César Estébanez, Ricardo Aler, and José M. Valls Universidad Carlos III de Madrid, Spain E-mail: {cesteban, aler, jvalls}@inf.uc3m.es Coromoto León, Carlos Segura, and Gara Miranda Universidad de La Laguna, Spain E-mail: {cleon, csegura, gmiranda}@ull.es José M. Chaves-González, Miguel A. Vega-Rodríguez, and Juan A. Gómez-Pulido Universidad de Extremadura, Spain E-mail: {jm, mavega, jangomez}@unex.es based algorithm (Scatter Search) and a trajectory based (1+1) Evolutionary Algorithm. Finally, the analysis of the frequency plans obtained offers insight about how the interference cost is reduced in the optimal plans.

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“…Third-generation networks have been under intensive study by worldwide and European standardization bodies, such as the International Telecommunication Union (ITU) and ETSI, as well as the European Commission, leading to the concepts of IMT2000 [6] and UMTS respectively [7]. Laboratory trials and field trials have been taking place.…”

Section: Integrated Fixed and Mobile Communicationsmentioning

confidence: 99%

Beyond the TINA Lesson: Distributed Processing for Integrated Fixed and Mobile Communications

Trigila

2000

Trends in Distributed Systems: Towards a Universal Service Market

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Abstract. A major keyword of the Information and CommunicationTechnology progress in the Nineties is convergence: integrated provision of telecommunications and information services, integrated management and control, provision of services above an infrastructure resulting from the interconnection of various network types, ubiquitous offering of fixed and mobile services. This paper deals with a technological enabler of convergence, namely network programmability, on a geographical scale and, eventually, on a global, worldwide level. Nowadays, the main convergence problem appears to be UMTS, defined by somebody as "the fusion of Fixed and Mobile Networking". The distributed processing paradigm of TINA as an enabler of fixed and mobile convergence is analyzed, through a timeline summarizing more than a decade of research and development. Pre-TINA solutions and post-TINA solutions are included in this timeline.

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UMTS: targets, system concept, and standardization in a global framework

Cited by 127 publications

References 6 publications

A microcellular ray-tracing propagation model and evaluation of its narrow-band and wide-band predictions

A microcellular ray-tracing propagation model and evaluation of its narrow-band and wide-band predictions

Optimization algorithms for large-scale real-world instances of the frequency assignment problem

Beyond the TINA Lesson: Distributed Processing for Integrated Fixed and Mobile Communications

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