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TechSpec
  • Foreword
  • 1 Scope
  • 2 References
  • 3 Abbreviations
  • 4 Cross phase compatibility
  • 5 Network initiated unstructured supplementary service
  • 6 Mobile initiated unstructured supplementary service data
    • 6.1 Handling of mobile initiated USSD
    • 6.2 Functions and information flows
      • 6.2 Functions and information flows
      • 6.2.1 Handling of USSD request at MS
      • 6.2.2 Handling of USSD request at MSC
      • 6.2.3 Handling of USSD request at VLR
      • 6.2.4 Handling of USSD request at HLR
      • 6.2.5 Processing the USSD request
    • 6.3 Information stored in the HLR
    • 6.4 Information stored in the VLR
    • 6.5 Handover
    • 6.6 Cross-phase compatibility

6.1 Handling of mobile initiated USSD

23.0903GPPRelease 17Stage 2TSUnstructured Supplementary Service Data (USSD)

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

A MS can at any time initiate a USSD request to the network. No prior provision of the service is required, although provisioning of services which make use of USSD may be required. All USSD messages (requests and responses), contain the USSD string, an alphabet indicator and language indicator.