Circuit switched data bearer services
The present document provides an overview of the architecture and issues related to the provision of Circuit Switched Bearer Services in a 3G mobile network (UMTS) operating in UTRAN or GERAN Iu mode. Handover to GERAN A/Gb mode is also considered.
NOTE: The Gb interface does not play any role in the scope of the present document although the term "A/Gb mode" is used.