name: S11
full_form: Interface between MME/SGSN and SGW for control plane
context: The Create Indirect Data Forwarding Tunnel Request message shall be sent on the S11/S4 interface by the MME/SGSN to the SGW as part of the Handover procedures or TAU/RAU procedure with Serving GW change and data forwarding as specified in clause 5.3.3.1A of 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [3]. Table 7.2.18-1 specifies the presence requirements and the conditions of the IEs in the message. Table 7.2.18-1: Information Elements in a Create Indirect Data Forwarding Tunnel Request Table -2: Bearer Context within Create Indirect Data Forwarding Tunnel Request
description: The S11 interface is a critical control plane interface between the Mobility Management Entity (MME)/Serving GPRS Support Node (SGSN) and the Serving and Packet Data Network Gateway (SGW). It plays a vital role in managing data forwarding tunnels, particularly during handover procedures or Tracking Area Update/Routeing Area Update (TAU/RAU) procedures with Serving GW change. The S11 interface enables the exchange of control messages, such as the Create Indirect Data Forwarding Tunnel Request, to facilitate efficient data forwarding and minimize packet loss.
explanation: The S11 is classified as an Interface because it defines a specific communication path between MME/SGSN and SGW for exchanging control plane information. This interface is crucial in the context of 3GPP specifications for Evolved Packet System (EPS) and General Packet Radio Service (GPRS) enhancements, particularly for managing data forwarding tunnels during handover or TAU/RAU procedures.
section_title: 7.2.18 Create Indirect Data Forwarding Tunnel Request
biotag_Context: O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,B-Procedure,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,B-Organization,B-Specification,O,B-Technology,I-Technology,I-Technology,I-Technology,O,O,O,B-Network,I-Network,I-Network,I-Network,I-Network,I-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O
biotag_Description: O,B-Interface,O,O,O,O,O,O,O,O,O,B-Network Function,I-Network Function,I-Network Function,O,B-Network Function,I-Network Function,I-Network Function,O,O,O,B-Network Function,I-Network Function,I-Network Function,I-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,I-Parameter,O,O,O,O,O,O,O,B-Network Function,O,O,B-Interface,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O