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12SIGNALING IN CELLULARMOBILE TELECOMMUNICATIONSCellular mobile telecommunications is one of the most important telecommunicationdevelopments of the last decade. The technical concepts underlying this typeof communications were developed by Bell Laboratories [1,2] and implementedin the advanced mobile phone service (AMPS) system.Early mobile stations (MSs) were designed as car phones. They were too bulky tobe carried around and had to be powered by the battery of the car. Today, there arecompact lightweight MSs with internal rechargeable batteries. They can be carriedby hand and are “personal” phones rather than car phones.There are two groups of signaling procedures in cellular mobile telecommunications.This chapter describes the signaling between a MS and a cellular mobilenetwork. The second group of signaling procedures involves various entities in amobile network and is discussed in Chapter 19.Sections 12.1–12.6 of this chapter cover signaling in the AMPS system and itssuccessors in the United States. Sections 12.7–12.9 describe signaling in theglobal system for mobile telecommunications (GSM), which has emerged as themost important cellular system outside the United States. Systems based onCDMA technology are discussed in Chapter 13.12.1 INTRODUCTION TO CELLULAR MOBILE NETWORKSThis section briefly describes some important aspects of cellular mobile networks[3–5].Signaling in Telecommunication Networks, Second Edition, by John G. van Bosse and Fabrizio U. DevetakCopyright # 2007 John Wiley & Sons, Inc.327