Introduction to GSM: Physical Channels, Logical Channels, Network, and Operation by Lawrence Harte
GSM Switching, Services and Protocols by Hans-Jorg Vogel, Christian Bettstetter
An Introduction to GSM (Mobile Communications Library) by Siegmund H. Redl, Matthias Weber, Malcolm W. Oliphant
GSM Networks: Protocols, Terminology and Implementation (Mobile Communications Library) by Gunnar Heine
Radio Interface System Planning for GSM/GPRS/UMTS