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TechSpec
  • Foreword
  • 1 Scope
  • 2 References
  • 3 Definitions and abbreviations
  • 4 Handling of Follow Me
    • 4.1 General
    • 4.2 Information Flows
    • 4.3 Handling of FM control in HLRa and FFNb
      • 4.3 Handling of FM control in HLRa and FFNb
      • 4.3.1 Handling of FM control in HLRa
      • 4.3.2 Handling of FM control in FFNb
    • 4.4 USSD interworking and Cross-phase compatibility
  • 5 Information stored in the network entities
  • B.1 General principles
  • B.2 Information Elements used in the messages
  • B.3 Messages Contents of the FM Request
  • B.4 Messages Contents of the HLR-FM-Request
  • B.5 Contents and Format of the USSD String of the USSD-Notify
  • B.6 Inter-process Message Init-Notify

B.1 General principles

23.0943GPPFollow-Me (FM)Release 17Stage 2TS

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

All messages used for the control of FM are based on mobile initiated USSD. The principles of USSD can be found in 3GPP TS 22.090, 3GPP TS 23.090, 3GPP TS 24.090 and 3GPP TS 29.002.

The present document is only concerned with the contents of the USSD strings.