Prowid course material: https://kurslar.prowid.com/en/index.php?id=lesson&m=3872
2G/3G Mobile Networks: GSM, UMTS, MAP and SMS · 2G/3G packet data and Release 4 architecture
GPRS and EDGE architecture: SGSN, GGSN, and the Gb, Gn, and Gi interfaces
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