It has been known for over one hundred years that radio can be used to keep in touch with people on the move. However, wireless communications using radio were not popular until Bell Laboratories developed the cellular concept to reuse the radio frequency in the 1960s and 1970s [31]. In the past decade, cellular communications have experienced an explosive growth due to recent technological advances in cellular networks and cellular telephone manufacturing. | Handbook of Wireless Networks and Mobile Computing Edited by Ivan Stojmenovic Copyright 2002 John Wiley Sons Inc. ISBNs 0-471-41902-8 Paper 0-471-22456-1 Electronic CHAPTER 2 Location Management in Cellular Networks JINGYUAN ZHANG Department of Computer Science University of Alabama INTRODUCTION It has been known for over one hundred years that radio can be used to keep in touch with peopleonthemove. However wireless communications using radio were not popular un-tilBellLaboratories developedthe cellular concept to reuse the radio frequency in the 1960s and 1970s 31 In the past decade cellular communications have experienced an explosive growth due to recent technological advances in cellular networks and cellular telephone manufacturing. It is anticipated that they will experience even more growth in the next decade. In order to accommodate more subscribers the size of cells must be reduced tomake moreefficient use of the limited frequency spectrum allocation. This will add to the challenge of some fondamental issues in cellular networks. Location manage-mentisoneof the fundamental issuesincellular how to track sub-scribersonthe move. The porposn of thirchaateris toiia-veyreceulreseeerhoulotntion managemt ntm relluies oetwse est of Cfocsbapicslsorgeiiinte us follows. Seelies euucepft astrunptlonkPhotoue oommonlyusedloevafoaCe atos catlokmonagomentsehemeinieemc ofeetw-orkiocology. gaOlas-ieai osobaCility. tuol m u bility. lci kse n2 iesmkvycpopolar lokotionmanancmen0 cc s. ifoelly. knnmlatieasthecUaplrf . eu eu lular n e-works In a e ik c i C e rt aservice eoverage urea ik c ieS Oin- oi ncu Jcugouai at easte-Oenadto ar ccIIs. Eacb ocOic cnraodUyabasn Ok tocuwAlmttatawithmsAile-faSianssuoheseolhdartelephones lltmgitsfndéoCroukcaio-ne. The base Wi Ii m ns t lmects n ft iha mobiic .
