S1 Application Protocol (S1AP)

in Specification, LTE, S1AP

S1AP provides the signalling service between E-UTRAN and the evolved packet core (EPC) and has following functions:

  • E-RAB management function
  • Initial Context Transfer function
  • UE Capability Info Indication function
  • Mobility Functions
  • S1 interface management functions
  • NAS Signalling transport function
  • S1 UE context Release function
  • UE Context Modification function
  • Status Transfer
  • Trace function
  • Location Reporting
  • S1 CDMA2000 Tunneling function
  • Warning message transmission function
  • RAN Information Management (RIM) function
  • Configuration Transfer function

Protocol specification

3GPP TS 36.413 - Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)


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