Thanks a lot for the reply. You have almost answered my question 🙂 Now there is a slight confusion. How and when does the MS scan the RxLev of the BCCH of the serving cell? And also, all the System Information messages are transmitted on the SACCH, so why does the drop call rate increase for a cell if it is experiencing co channel interference? If a cell has 4 TRXs for example, most of the calls would not be established on BCCH TRX, so why does the call drop rate increase?