Not sure if anyone has heard of this besides me.
There is a PS3 application called Ad-Hoc party play exclusive for Japan only.
This application allows you to play PSP ad-hoc games over your PS3's wifi connection.
Requirements: You must make a Japanese playstation account and visit the Japanese playstation store.
To do this you must have a Wired connection.
Any thing I missed just post as questions.
I downloaded it. But I couldn't understand the menus so I gave up.
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You`ll need to be in the Ad-Hoc meeting area in your game(where ever you go when you want to play ad-hoc) and go to the third option, the PS3 will determine wether or not you can get in to a room according to your game.