ABSTRACT
CONTENTS 1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Radio Technology Aspects of Sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Types of Spectrum Sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.4 Spectrum Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.5 Traffic Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.1 Introduction Spectrum sharing means different things to different people. To the national administrations it means to make more spectrum available for services whose growth is in the national interest, without upsetting too much the existing users of the spectrum. To network operators with a diverse spectrum portfolio it means sharing that portfolio among its customers to maximize business value. Other actors in the value chain, such as service providers and end users, don’t care about spectrum; they are interested in receiving sufficient service at acceptable cost. We restrict ourselves here to dynamic spectrum access (DSA), whereby sharing is organized among users, and the allocation can change in time depending on the demands of the systems that are sharing. This is distinct from co-existence, whereby a fixed provision is made for users of the same or different spectrum so that they don’t cause each other harmful interference. In addition to the division into national and corporate sharing, we can also divide spectrum sharing according to the licence conditions, and here we make two classes, which are licence-exempt sharing (LES) and licensed assisted access (LAA). Both LES and LAA can be on a national or corporate basis and we have to consider all the combinations when thinking about licensed shared access (LSA).
