As early as 2014, mobile network operators’ spectral capacity will be overwhelmed by the demand brought on by new devices and applications. To augment capacity and meet this demand, operators may choose to deploy a Dynamic Spectrum Access (DSA) overlay. The signaling and functionality required by such an overlay have not yet been fully considered in the architecture of the planned Long Term Evo...

The idea of Cognitive Radio (CR) is to share the spectrum between a user called primary, and a user called secondary. Dynamic Spectrum Access (DSA) is a new spectrum sharing paradigm in cognitive radio that allows secondary users to access the abundant spectrum holes in the licensed spectrum bands. DSA is an auspicious technology to alleviate the spectrum scarcity problem and increase spectrum ...

Vijay Vittal Arizona State University 15.1 Definitions and Historical Perspective ........................ 15-1 15.2 Criteria for Security ...................................................... 15-2 15.3 Assessment and Control ............................................... 15-3 15.4 Dynamic Phenomena of Interest ................................. 15-3 15.5 Timescales ..............................

The Global Climate Observing System (GCOS) was established in 1992 to ensure that the observations necessary to address climate-related issues are defined, obtained and made available, to all potential users. The Swiss GCOS Office at the Federal Office of Meteorology and Climatology MeteoSwiss has the task of coordinating all climate relevant measurements in Switzerland (GCOS Switzerland). As s...

Besides the dominant focus of urban remote sensing research on local and regional scales, the URS2005 conference offers a special session on “Global Observation of Urban Areas”. This session was jointly initiated by the GOFC-GOLD (Global observations of forest and land cover) emphasizing that coordinated, consistent, and operational urban mapping and monitoring has to consider the evolving effo...