5G-NR Frame structure

Numerology – Subcarrier Spacing

  • As we know in LTE we have only one type of subcarrier spacing i.e. 15Khz.
  • NR support multiple type of subcarrier spacing.
  • NR supports a flexible OFDM numerology with subcarrier spacings ranges from 15 kHz to 240 kHz with a proportional change in cyclic prefix duration.

Supported Channel mapping with numerology

  • It’s Not like that every numerology can be used for every physical channel.
  • Numerologies has been specified as per certain type of physical channel.

Numerology, Radio Frame Structure and Slot Length

  • Slot Length changes depending on numerology.
  • Increase in subcarrier spacing will decrease slot length.

Radio Frame Structure

subcarrier 15KHz
subcarrier 30KHz
subcarrier 60KHz
subcarrier 120KHz
subcarrier 240KHz


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