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Solution
The S4 interface is is a 4G interface between the SGSN and SGW.
In wireless applications, the S4 interface is a 4G interface between the SGSN and SGW.
Overview
S4 interface is between the SGSN and SGW. It uses GTP V2 over UDP transport protocol.
Network Diagram
Messages
Create Session Request/Response
Modify Session Request/Response
Delete Session Request/Response
Call Flows
Standards
3GPP TS 29.274
Related Products and Protocols
Products
Mobile Core Network Tester
Mobile Core Network Emulator
Simulation Toolkits
Protocols
GPRS Tunneling Protocol (GTP)