Your normal descent rate would be about 2000 fpm/planned descent speed.If ATC put you 'closer',extended speed brake/spoiler,increase speed to highest legal(A320 disconneCt the Auto pilot to get'best' rate-full spoiler).If still high or have to reduce speed -dump the 'gear..!!
Cheers
In this configuration one can get as much as 6000 fpm descent,when back on profile auto pilot on, clean up as required.
