5G NR- Physical Layer Timing Unit

Author 5G, 5G Physical Layer, New Radio, Tech Fundas

In 5G, New Radio the basic time unit is represented by Tc and 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:
Tc = 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 by Ts and expressed by following equation

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

Ts and  Tc  Relation 
The specification provided a constant   to relate NR basic time unit and LTE basic time unit and represented by following equation.

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