yes thats right; for optional feature in E/// BSS system called Network Synchronization; with this not only can you synchronize TGs for co-sites cells but for all cells, allowing you to use tighter freq re-use and avoid collisions.
which part nr. has the GPS receiver in Ericsson. Can`t find info about that in my documentation? Do you have more detailed docs on this? We`re struggling with drop calls in tight freq choosen cities.