Simultaneous voice and data operation for GPRS/EDGE: class A dual transfer mode
Mark Pecen, Adam S. Howell · IEEE Personal Communications · 2001
Class A dual transfer mode of GPRS/EDGE operation addresses barriers in the migration path from the so-called 2.5G services offered by GSM to similar ones offered by UMTS and the ability to offer users a reasonably priced service that combines voice and data interchange capabilities with a low-cost mobile station.