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TechSpec
  • Foreword
  • 1 Scope
  • 2 References
  • 3 Definitions
  • 4 Main concepts
  • 5 HSCSD architecture and transmission
    • 5.1 Air interface
    • 5.2 Functions and information flows
      • 5.2 Functions and information flows
      • 5.2.1 Call establishment procedures
      • 5.2.2 Handover procedures
      • 5.2.3 Resource upgrading, downgrading and configuration change (A/Gb mode)
      • 5.2.3a Resource upgrading, downgrading and configuration change (GERAN Iu mode)
      • 5.2.4 User initiated service level up- and downgrading (A/Gb mode)
      • 5.2.4a User initiated service level up- and downgrading (GERAN Iu mode)
      • 5.2.5 Link adaptation for ECSD
      • 5.2.6 Start of ciphering
    • 5.3 Transparent data transmission
    • 5.4 Non-Transparent data transmission
    • 5.5 Interworking
    • 5.6 Subscription aspects and storage of subscriber data
  • 6 Charging

5.2.4a User initiated service level up- and downgrading (GERAN Iu mode)

23.0343GPPHigh Speed Circuit Switched Data (HSCSD)Release 17Stage 2TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Figure 9a depicts the procedures for a successful user initiated service level up- and downgrading for on‑going HSCSD call in GERAN Iu mode.

The user initiated service level up- and downgrading is applicable in non-transparent mode connections, only.

Figure 9a: User initiated service level up- and downgrading in GERAN Iu mode