Bangkok Airport departures / Qatar Airways

I'll be flying out of Bangkok's Suvarnabhumi airport with Qatar Airways to Doha and am wondering if anyone can tell me which terminal concourse they depart from. The airport is so huge and I'll have quite some time to kill so was thinking of booking an airport lounge which are offered at Concourse A, Councourse D and Concourse F. Obviously, I'd prefer a lounge near to the concourse where my flight is expected to depart from. Any help would be most appreciated.

I can't tell you which gate you'll be leaving from because they change all the time. I can tell you the following:
Concourse A and B are for domestic flights
Concourse G has the VIP lounge for international flights
Concourse buildings C, D, E, F and G are for international passengers. Here's a map.
http://www.tatnews.org/tourism_news/images/Suvarnabhumi/main/b-concourse-CDEF.gif

Here's a link to check flight times
http://www.tatnews.org/tourism_news/images/Suvarnabhumi/main/b-concourse-CDEF.gif

If you can afford to pay for an airport lounge why not just call Qatar Air and have them hook you up?