Gy Interface: Gy is a signaling protocol used between a GGSN/PGW and the OCS for real-time charging interactions. It allows the network to send charging information, like data volume or session duration, to the OCS for processing and potential deductions from the subscriber’s account.
Analogy: Gy is like a secure connection between a cash register (GGSN/PGW) and a bank’s payment processing system (OCS). It securely transmits transaction information for authorization and billing.
Why It Matters: Gy is essential for enabling online charging in mobile data networks, ensuring accurate billing for data services based on real-time usage.