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RAN3 - Iu, Iub, Iur, S1, X2 and UTRAN/E-UTRAN

RAN WG3 is responsible for the Overall UTRAN/E-UTRAN architecture and the specification of protocols for the Iu, Iur, Iub, S1 and X2 interfaces.

Terms of Reference 

The latest terms of reference were approved at RAN#71
in document RP-160060

Within the scope of TSG RAN, RAN WG3 is responsible for the development of specifications dealing with UTRA, Evolved UTRA, and beyond, and in particular for:

  • Overall UTRAN and E-UTRAN architecture
  • Synchronisation in UTRAN and E-UTRAN
  • Stage 2 work of Work Items allocated by TSG RAN to RAN WG3
  • UTRAN and E-UTRAN O&M requirements
  • Iu interface protocol specifications, i.e. access stratum protocols over the Iu reference point
  • Iur and Iub interface protocol specifications
  • Iupc interface protocol specifications
  • Iubc interface protocol specifications
  • Transport of implementation specific O&M between the Management System and Node B
  • Application of the RANAP on the E-interface
  • Iu-ant interface protocol specifications (RF-parts of the layer 1 specification are under the responsibility of RAN4)
  • Parts of Iu and Iur protocols common to GERAN and UTRAN (Iu-g and Iur-g)
  • S1 and X2 interface protocol specifications
  • M1, M2 and M3 interface protocol specifications
  • Iuh, and Iurh interface protocols specification
  • LTE Positioning Protocol A (LPPa)
  • Xw interface protocol specifications

Useful links and information

About RAN WG3 List of elected officials
Documents Meeting documents
  Work items
Meetings Next meeting information & previous meeting reports and documents
  Liaisons Statements
  Full RAN WG3 meeting calendar
General info Email exploder lists


RAN Working groups and Ad Hoc groups 
TSG RAN Plenary  
TSG RAN WG1 Radio Layer 1 specification
TSG RAN WG2 Radio Layer 2 and Radio Layer 3 RR specification
TSG RAN WG3 Iub Iur and Iu specification - UTRAN O&M requirements
TSG RAN WG4 Radio performance and protocol aspects (system) - RF parameters and BS conformance
TSG RAN WG5 Mobile terminal conformance testing
TSG RAN WG6 Legacy RAN radio and protocol
TSG RAN AHG1 Ad-hoc group on ITU (internal) co-ordination
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