Wireless Oom

For a UE that is in any state except CELL_DCH, the measurement control information is received via the SIB messages (SIB 11 or SIB 12).
For a UE that is in the CELL_DCH state, the measurements are controlled via a MEASUREMENT CONTROL message directly received from the serving RNC.

SIB 12
contains measurement control information for a UE in connected mode.
If SIB 11 is not present it can also be used for UEs in idle mode.

SIB 11
contains measurement control information for a UE in idle mode.
If SIB 12 is not present it can also be used for UEs in connected mode.