Jaana Laiho

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The history of mobile communications started with the work of the first pioneers in the area. The experiments of Hertz in the late 18th century inspired Marconi to search markets for the new commodity (to be). The communication needs in the First and Second World Wars were also supporting and accelerating the start of cellular radio, especially in terms of(More)
— The operation and maintenance of the 3G mobile networks will be challenging. These networks will be strongly service driven, and this approach differs significantly from the traditional speech dominated 2G approach. Compared to 2G, in 3G the mobile cells interact and interfere with each other more, they have hundreds of adjustable parameters, and they(More)
This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Helsinki University of Technology's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for(More)
This paper describes the system dimensioning and the radio network planning methodology for a third generation WCDMA system. The applicability of each method is demonstrated using examples of likely system scenarios. The challenges of modeling the multiservice environment are described and the implications to the system performance simulations are(More)
Mobile networks produce a huge amount of spatio-temporal data. The data consists of parameters of base stations and quality information of calls. The Self-Organizing Map (SOM) is an efficient tool for visualization and clustering of multidimensional data. It transforms the input vectors on two-dimensional grid of prototype vectors and orders them. The(More)
This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Helsinki University of Technology's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for(More)