5G NR- Physical Layer Timing Unit

5G NR- Physical Layer Timing Unit

In 5 G New Radio the basic time unit is represented byT_cand as per 3GPP TS38.211 can be expression by following equation:

Where is subcarrier spacing and is FFT size. Considering above equation timing can be calculated as follows:
T_c= 1 / (480 x 10³ x 4096)

= 1 / 1966080000
= 1 x 10^-3/ 196608 = 5.0862 x 10^-10
= 0.509 nano second

LTE basic time unit is represented byT_sand expressed by following equation

T_s= 1 / (15 x 10³ x 2048)
= 1 / 30720000
= 1 x 10^-3/ 30720 = 3.2552 x 10^-8
= 32.55 nano second

T_{s and}T_{c Relation}
The specification provided a constant to relate NR basic time unit and LTE basic time unit and represented by following equation.