Can I meet a transit passenger airside at DOH if we are departing on the same flight?

This is my first flight so I am not sure about how flying works. Basically my friend is transiting at Doha (DOH) from the UK to go to Singapore, I am also booked on same flight with him, as I live in Qatar, and I will go with him to Singapore. My friend has 5 hours' transit time.
My question is, can I meet my friend once he arrives at the airport and stay inside the airport, and can we both go together to the next flight?
Best Answer
AIUI (no personal experiance, based on what I have read online)
You will need to check in and go through exit immigration and security. Your friend would normally go through transfer security. Once you both reach the international departure area you should be able to meet up.
A complication may be if you have checked baggage. Many airlines restrict how early you can check your bags, so you may have to wait for baggage check to open for your flight before you can check your bags and proceed through immigration and security to join your fried.
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Can a transit passenger leave the airport?
Yes, you can leave the airport during domestic layovers. For instance, if you're a US citizen and have a layover within the country, it is legal and safe to leave the airport. Be aware that you'll probably be getting two boarding passes if the domestic layover is more than an hour.What does it mean to transit airside?
Airside transit refers to passengers catching an onward flight on the same day and from the same UK airport at which they arrived.Do transit passengers have to go through immigration?
Transit passengers You are a transit passenger if you are not leaving the airport and not staying in that country. In this case, you often don't have to go through immigration or customs. Look for a sign that says transit or transit passengers or transfer or connecting flights.How do airport transits work?
In general, if you're on a domestic flight, once you land for your layover, you'll pass through a transfer area that will take you to the gate for your next flight without having to check in again. Your bags will automatically pass through to the next flight without you having to collect them.UK VISAS FAQs: UK TRANSIT VISAS
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