The DL Meas REp sending is handled on TRX bases. It depends on the following attributes of the TRX Object:
1) radioMeasRep (Meas rep enabled/disabled)
2) radioMeasGran (radio Meas Rep granularity).
On Siemens equipment PC and HO are performed on BTS, so it is no necessary to send DL Meas Rep to BSC every SACCH period.
With these two attributes we can limitate the Abis traffic.