The regular season (and all games before the final playoffs) will start on September 18, 2011, and will finish on April 28, 2012.
Group A is also divided in two: The three best teams of each group plus a fourth qualified decided with special criteria will play a double leg play-off.
The three first qualified teams of each group played against each other a two-legged tie.
The winners of the games join the Final Stage playoffs.
After the regular season of the groups A-A and A-B, the team qualified in the same position play a double game play-off to determine their final position in the table.