Compassionate I am using this opportunity to share some of the technical and management experiences that I have gained while working for the three leading telecommunication service providers of the world. During my tenure at Sprint (USA), Pakistan Mobile Communications Limited (an Orascom Telecom Company) and currently with Telenor Pakistan (Telenor Group), I have come across a number of learning opportunities not only as a technologist but also as a people manager and as a strategist. The book takes an in-depth look at the Mobile Communications Ecosystem which traditionally includes elements of end-user devices, radio access network, transport network, core network, operational support systems (OSS) and services. Based on my experiences, I believe that this ecosystem can be strengthened by including Technology Management to the value chain. Technology Management (TM) is the norm of the game in all the organizations associated with technology and innovation driven mobile communications industry; whether it is practiced full heartedly or ineffectively it's a different matter. TM mostly deals with non engineering elements like technology strategy, technology roadmapping, innovation management, etc. Moving on, the book takes a deeper look at the two prevailing Next Generation Radio Access Technologies (standards) - 3GPP 3G-LTE and IEEE WiMAX and it also discusses their respective evolution towards 4G (IMT-Advanced). Besides radio technologies, a chapter is dedicated each for transport network, core network and OSS, services, devices and TM. The role of various standard development organizations and industry forums is highlighted throughout the book. Chapter 1 introduces the enhanced mobile communications ecosystem model along with an overview of the book. Chapter 2 looks into OFDMA which is the newest form of multiple access technique used in both 3G-LTE and WiMAX and also envisioned for future 4G (IMT-Advanced) systems. Chapter 3 to Chapter 6 looks into four different radio access techniques namely 3G-LTE, WiMAX, 3