bandwidth per user (pppoe)

Hi All, I have successfully set up freeradius with mysql backend, rp-pppoe concentrator, and pppd. Bandwidth control also working, but every pppd connection have the same bandwidth, because I cannot determine which user has benn connected. I use the ppp/ip-up script to control the bandwidth. The desired bandwidth is in the mysql database too, for each user. Could You help me find a way how to use different badwidth to each user? thx in advance TM