This document is a dissertation submitted for a Master of Technology degree focused on ATM basics for WCDMA networks. It includes a title page, certificate of approval from the supervisor, candidate's declaration, acknowledgements, table of contents, lists of abbreviations and symbols, and 12 chapters covering topics like ATM standards, the physical layer, ATM layer, adaptation layer, signaling, traffic descriptors, and quality of service parameters. The dissertation provides a comprehensive overview of Asynchronous Transfer Mode (ATM) technology as it relates to 3G wireless networks.