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PSS is a specific physical layer signal that is used for radio frame synchronization. As in LTE case, UE is first trying to find PSS when powered on and tuned to a specific frequency it tries to camp on. Once it is successful to detect the PSS, it starts to decode the entire SSB. It has characterstics as listed below.
Comparision to LTE PSSFollowing is the PSS sequence generation formula for NR PSS and LTE PSS. As you see here, NR PSS is a kind of m-Sequence whereas LTE PSS is a kind of Zadoff-chu sequence. Sequence Generation AlgorithmNR PSS sequence is generated by the following formula. Unless you are the one who need to implement this, you may not need to understand every details of this formula. But at least it would be good to know of the major factors to determine the sequence. Followings are some highlights about this sequence.
Reference[1] 38.211 NR;Physical channels and modulation(Release 15)
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