S4 Interface

S4 interface is 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