The Pseudo Random Sequence generation algorithm in NR is same as the one in LTE as shown below. The usage of the sequence is also almost same as in LTE. Only minor difference would be the value initialization part.... overall you may think there is almost no difference from LTE.

As shown in the equations above, in both NR and LTE, the sequences are generated using the same polynomial functions:

• The scrambling sequence c(n) is created by the sum of x₁(n + N_c) and x₂(n + N_c), modulo 2.
• The first long-term sequence x₁(n+31) is updated using the sum of x₁(n+3) and x₁(n), modulo 2.
• The second long-term sequence x₂(n+31)  is updated using the sum of x₂(n+3), x₂(n+2), x₂(n+1), and x₂(n), modulo 2.

The image text concludes by emphasizing that despite the similarities, there are minor differences in how the sequences are initialized, but overall, they are nearly the same between NR and LTE.

Following is the case showing how pseudo random sequence is being used for PDSCH and PDCCH channel coding process in NR.

• The sequence generation begins with initial conditions for two long-term sequences x₁ and x₂. The initial condition for x₁ is given for indices 0 to 30, while the initial condition of x₂ is defined by a given formula.
• The scrambling sequence c(n) is computed using x₁ and x₂ sequences, combined with a Gold sequence and modulo 2 arithmetic, where N_c is a constant set to 1600.
• For PDSCH scrambling, the initialization sequence c_init is calculated using the RNTI (Radio Network Temporary Identifier), a quarter index q, and the scrambling identity n_ID. The scrambling identity is either set to a value from 0 to 1023 if configured, or to the physical cell ID N_ID^cell otherwise.
• For PDCCH scrambling, c_init is directly set to the physical cell ID N_ID^cell.

Reference

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