RA_RNTI Calculator

Author: Dustin_Chen, email: Dustin_Chen@compal.com or chuhpsdustin@gmail.com

● Ref: 38 211 Table 6.3.3.2-3 & 5.3.2 OFDM baseband signal generation for PRACH

RA-RNTI = 1 + s_id + 14 × t_id + 14 × 80 × f_id + 14 × 80 × 8 × ul_carrier_id


• s_id : first OFDM symbol of the PRACH occasion (0 ≤ s_id < 14)
• t_id : first slot of the PRACH occasion in a system frame (0 ≤ t_id < 80), where the subcarrier spacing to determine t_id is based on the value of μ specified in clause 5.3.2 in TS 38.211
• f_id : PRACH occasion in the frequency domain (0 ≤ f_id < 8)
• ul_carrier_id : the UL carrier used for Random Access Preamble transmission (0 for NUL carrier, and 1 for SUL carrier)

(1) calculate RA_RNTI

• s_id (0 ≤ s_id < 14):
  
• t_id (0 ≤ t_id < 80):
  
• f_id (0 ≤ f_id < 8):
  
• ul_carrier_id (0 for NUL carrier, 1 for SUL carrier):
  
Calculate

(2) calculate (s_id, t_id, f_id, ul_carrier_id)

• RA_RNTI:
  
Calculate