What information is present in PRACH Preamble (Msg1)?

Specs & Protocol Testing
1

Hello Experts.

What information is present in PRACH Preamble (Msg1)?

Is if just zad-off chu sequence or more information is encoded info it?
Or
What information does gNB decode from this Prach Preamble (Msg1)?

2

Msg1 has - TCP+TSeq+TGT.
Tcp - cyclic prefix
Tseq - random sequence generated from zaddoff basis u long or short seq
TGT - guard time.

So msg1 sent with zaddoff chu sequence along with msg cause.

3

I meant to say what physical message is sent using this PRACH Preamble?

Does it give any information to gNB? (These sequences)

4

These sequence gives indication to gnb like any ue wants to access gnb service.

So preamble just kind of indication to access service.

No other role.