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TechSpec
  • Foreword
  • 1 Scope
  • 2 Network configurations
  • 3 Transmission performance
    • 3 Transmission performance
    • 3.1 Overall Loss/Loudness ratings
    • 3.2 Stability Loss
    • 3.3 Delay
    • 3.4 Echo
    • 3.5 Clipping
    • 3.6 Idle channel noise (handset and headset MS)
    • 3.7 Noise contrast
    • 3.8 Sensitivity/frequency characteristics
    • 3.9 Distortion (handset and headset MS)
    • 3.10 Sidetone (handset and headset MS)
    • 3.11 Not used
    • 3.12 Requirements for information tones
    • 3.13 Crosstalk
    • 3.14 MS Ambient Noise Rejection
  • A.1 Handsfree MS
  • A.2 Handset MS
  • A.3 Headset MS
  • A.4 Inter‑reaction with DTX
  • C.1 Not usedC.2 Not usedC.3 Not usedC.4 Not usedC.5 Variation of gain with input level
  • C.6 Not used
  • C.7 Not used
  • C.8 Not used
  • C.9 Not used
  • C.10 Delay for handsfree MS
  • D.1 Full rate MS delay requirement definition
  • D.2 Half rate MS delay requirement definition

A.1 Handsfree MS

3GPP43.050Release 17Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) systemTS

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

The handsfree MS will almost certainly require the use of non‑linear processing for the acoustic echo control, the extraction of the speech from high levels of ambient noise. The implementation of these functions may well cause degradation to the overall transmission quality and cause difficulty to the distant end user especially during duplex conversation.