Incontro con Joseph Mitola III
Stevens Institute of Technology, USA

sul tema: Nuove frontiere nella gestione dello spettro radio

Incontro con Roberto Bisiani
Nomadis Lab - Università Milano Bicocca

sul tema: Wireless Sensor Networks

A synthesis of the objectives

The general objectives of Area 1 are the study and evaluation of radio systems, as well as the issues concerning the management of the radio spectrum. Radio systems are identified in terms of a) their radio-electric features, b) their displacement over the territory, and c) the services they are intended to offer over a specific area. Therefore, each radio system is seen from a global and comprehensive point of view, in order to assess the necessary resources to provide a certain service over a given territorial area and how to use them most effectively. Among such resources, the availability of a frequency band is crucial, since spectrum is often a scarce resource. From a nation-wide point of view, an efficient management of the radio spectrum is compelling. There are many facets to such process, from engineering to economic aspects. The objective of Area 1 is focused on technical issues mainly, within the wide context known as interference management. Thus, specific interest is devoted to the following issues:

• Global efficiency of radio systems (in time, space and frequency use) and optimisation of spectrum allocation. This implies the study of the impact of radio-communication issues (multiple access, diversity, coding, modulation, MIMO, MAC, ...) on global system efficiency, taking into account the relevant aspects of the propagation environment (interference, multipath, mobility, ...).

• Propagation models, for different frequency bands and propagation environments, to assess the impact of the propagation scenario on system performance.

• Comprehensive analysis of system aspects specified by the standards, to assess spectrum use efficiency and system global quality (number of users, average capacity per user, number of sites, implementation costs, etc.).

• Interference between systems, which may differ in service type (ex.: mobile vs. broadcast), duplex modality (FDD vs. TDD), Tx and Rx sites positioning criteria and characteristics, user terminal category, ...

• Harmonisation criteria for spectrum management in case of different destinations of the same band in adjacent territories (specific reference to the case of neighbouring nations).

• Radio spectrum engineering: criteria and procedures for "refarming" frequency bands (specific reference to the provisional plans for switching from analogic to digital broadcasting).

• Radio spectrum engineering: criteria for the optimal use of frequency resources in the presence of constraints of technical, economic or social nature.