Overview
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http://www.shoshin.uwaterloo.ca/~jscouria/GSM/gsmreport.html
Overview of the GSM system and protocol architecture
Rahnema, M.;
Communications Magazine, IEEE , Volume: 31 , Issue: 4 , April 1993
Pages:92 - 100
UMTS overview
Richardson, K.W.;
Electronics & Communication Engineering Journal , Volume: 12 , Issue: 3 , June 2000
Pages:93 - 100
http://engr.smu.edu/~ebird/EETS8306_Lecture11_GSM_2003_RevA.pdf
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