23.0343GPPHigh Speed Circuit Switched Data (HSCSD)Release 17Stage 2TS
For the purposes of the present document, the following terms and definitions apply:
A/Gb mode: mode of operation of the MS when connected to the Core Network via GERAN and the A and/or Gb interfaces.
GERAN: GSM/EDGE radio access network
HSCSD: High Speed Circuit Switched Data
HSCSD configuration: multislot configuration consisting of one or several full rate traffic channels for data transmission
HSCSD channel: full rate traffic channel belonging to a HSCSD configuration
Iu mode: mode of operation of the MS when connected to the Core Network via GERAN or UTRAN and the Iu interface. When preceded by the word GERAN or UTRAN, it means access over the Iu interface using the respective radio access network.
main channel: only channel in a HSCSD configuration carrying an FACCH
symmetric configuration: configuration consisting of bi-directional channels
asymmetric configuration: configuration consisting of bi-directional channels and at least one uni‑directional channel
UTRAN: UMTS radio access network
For further abbreviations see 3GPP TR 21.905 [1a].