i didn’t know the PS Handovers already existed in 2G. Which vendor is it ?
I don’t see any cons, but I assume it requires a good tuning of parameters so that RNC and BSC can communicate.
the pros is that there is no interruption of the PS transfer while the MS is moving from 3G to 2G. A reselection would take about 2s to 5s to complete, during which the transfer is stopped.