When UE is powered on, it first scans for all supported RF channels. And then list the channels whose RSSI is greater than a set threshold. For all cells satisfying this criteria, the PSS, SSS detection-> PCFICH -> MIB detection is done.
I would like to understand the term "preferred Rat" to camp on to a cell. How/when does the UE gets this information? Is this a stored info from USIM .. or from somewhere else?