Earners of this badge can describe the typical architecture of a mobile cellular system and outline the challenges of such a network and give examples of how these challenges have been met in modern network such as GSM, UMTS, LTE and 5G. Learners can also explain how a radio link works and describe various methods of multiple access used in today's networks. They will also be able show how networks have evolved from voice based to mainly packet based systems, such as LTE and 5G.