3GPP43.051GSM/EDGE Overall descriptionRelease 16Stage 2TS
See 3GPP TS 45.008, and 3GPP TS 25.931.
Annex A (informative):
Radio Access Bearer Realization
This annex describes how the different protocols of the GERAN User Plane protocol stack are configured to provide the desired radio access bearer classes (conversational, streaming, interactive and background). Only the traffic over Iu-ps interface is considered.