What does eNodeB do as soon as it power on?

Hi Experts.
Can anybody tell what does eNodeN do as soon as it power on?

Pss, sss sync
Dci read
For UE.

Once eNodeB power on it start transmitting pss, sss then all started from here i.e. msg1 and all.

When will it create s1 ap session with MME?

As part of ECM connected mode during attach it’s used.
Between eNodeB and MME we have initial UE message flow.
NAS message.

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So everytime when its network receive attach msg then it creates s1 ap session?
Or one time in needed?

Can you explain bit more please?