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This book focuses on issues related to multiple access for cellular mobile communications, with a specific interest in access arbitration through multiple access protocols situated at the lower sub-layer of the second OSI layer, namely the medium access control (MAC) layer. In this chapter, first an introduction to cellular mobile communication systems is provided. This introduction will be further expanded upon in Chapter 2, particularly with respect to the features which distinguish the different generations of mobile communication systems, from analogue first generation (1G) systems to possible fourth generation (4G) scenarios | Multiple Access Protocols for Mobile Communications GPRS UMTS and Beyond Alex Brand Hamid Aghvami Copyright 2002 John Wiley Sons Ltd ISBNs 0-471-49877-7 Hardback 0-470-84622-4 Electronic 1 INTRODUCTION This book focuses on issues related to multiple access for cellular mobile communications with a specific interest in access arbitration through multiple access protocols situated at the lower sub-layer of the second OSI layer namely the medium access control MAC layer. In this chapter first an introduction to cellular mobile communication systems is provided. This introduction will be further expanded upon in Chapter 2 particularly with respect to the features which distinguish the different generations of mobile communication systems from analogue first generation 1G systems to possible fourth generation 4G scenarios. Next it is discussed what impact the emergence of the Internet may have on cellular communication systems. The importance of multiple access protocols is also examined particularly in the context of packet-based systems and packet reservation multiple access PRMA is considered as a case study. Finally together with some background information an overview of our own research efforts related to PRMA-based protocols is provided. These efforts are mainly concerned with how to combine PRMA with code-division multiple access CDMA when such a combination is beneficial and more generally with different approaches to access control at the MAC layer and their respective benefits. They are documented in detail in later chapters. An Introduction to Cellular Communication Systems The Cellular Concept The first land mobile communication systems were based on wide area transmission 1 . Each base station had to provide coverage for large autonomous geographical zones. Calls of customers leaving a zone had to be dropped and re-established in a new zone 2 . Such systems suffered from low-capacity and high-transmit power requirements for mobile transceivers .

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