measurement report

hi, i like to check out the measturement report feature of GSM. the A-bis protocol shows measurement report indications, but i can't see any request to turn it on. on the BCCH it is turned on, as far as i can see in the bsc_hack.c. what do i miss? (neighbor cell frequencies?) also i like to get continuous informations about timing advance. any idea on how to retrieve these informations? regards, andreas