Pilot strength measurement (cont.)
Signal strength of BS2 is above T_ADD. BS2 can now be added to the active set.
Signal strength of BS1 is below T_DROP, which triggers the T_TDROP timer.
T_TDROP timer is triggered.
T_TDROP timer expires. BS1 is dropped from active set.
Signal strength above T_DROP. T_TDROP timer is cancelled.
Adding and dropping pilot illustration.