I think in 5G NR, In order to connect to the network UEs need to perform initial cell search.
PSS and SSS are transmitted in synchronization signal blocks together with the Physical Broadcast Channel (PBCH). The blocks are transmitted per slot at a fixed slot location.
To form a SS/PBCH block UE shall assume that reception occasions of a physical broadcast channel (PBCH), PSS, and SSS are in consecutive symbols.
reference- 3gpp 38.211,sec18.104.22.168
I am expecting some more answer on this post..