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I heard in the conversation which somebody was knocking the door and saying " It's me. Should I come up?"
I'm confused with the usage of this structure. I don't really understand why we use "should" here? Is there anyone who can help me?
thanks in advance

We often use should to give advice (You should get your hair cut.) or seek advice (What should I wear?). In your example the speaker is asking for advice on what to do and the sense is: "Would it be a good idea if I came up?"

More about the modal verb should here

Thanks, Joe. That was really helpful and also fruitful.

Should is the past tense of shall in indirect speech. It is used for Duty and obligation, Conditional clauses and Possibility. We can write the sentence like this:- "It's me. May I come up?"

Modal verbs. These are helping verbs, in this example it is used to make a suggestion.....other modal verbs about suggestion are
Could
May
Might
Shall.

I believe both are correct: Would it be a good idea if I came up? and It's me. May I come up?

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