High-level Data Link Control presentation Medium Access Control Protocols- detailed explanation congestion_control: types, uses and application connecting devices part-2: Router and its uses introduction to connecting devices, advantages and disadvantages WIDEBAND CODE DIVISION MULTIPLE ACEESS CHANNEL umts logical channels, it's type and description UMTS_AIR_INTERFACE_SPECIFICATION_AND_VARIOUS_INTERFACESppt UMTS security procedure: authentication and key procedure 
