[psp] How to use local trading...online?

Ok here is my request, I'm sure it's already made but I lack the details...I would like to do some car trading with my copy of gran turismo psp, problem is...no one near me has a copy :(And since the game doesn't have online capabilities, is there some way to send the "AD-HOC" wireless via online?I heard a friend talking about it (him and a mate do it apparently) but not sure of the name...and they aren't online right now :((And if this works, anyone care to trade some cars some time :) )

I don't know how to do online Gran Turismo but if you do find out a way I'd be glad to trade cars.