Tolong jelaskan mengenai From GPRS to UMTS dari 3G dalam bahasa sunda

From GPRS network, the following network elements can be reused:

Mobile switching centre (MSC) (vendor dependent)

Serving GPRS Support Node (SGSN) (vendor dependent)

Gateway GPRS Support Node (GGSN)

From Global Service for Mobile (GSM) communication radio network, the following elements cannot be reused

They can remain in the network and be used in dual network operation where 2G and 3G networks co-exist while network migration and new 3G terminals become available for use in the network.

The UMTS network introduces new network elements that function as specified by 3GPP: