H35-581-V2-0Demo

By Huawei · Question Mode

QuestionQ27

5G Radio Network Planning

If a cell covers a high-speed railway on which UEs travel at 250 km/h, which PRACH format should be selected for that cell?

  • A Format3
  • B Format2
  • C Format1
  • D Format0
Explanation

PRACH Format 3 uses 5 kHz subcarrier spacing, while Formats 0, 1, and 2 use 1.25 kHz. The wider 5 kHz spacing provides better tolerance of the Doppler shift associated with high-speed UEs, so it is appropriate for a 250 km/h railway scenario.

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