UMTS Terrestrial Radio Access Network Architecture Raul Bruzzone

UMTS Terrestrial Radio Access Network Architecture Raul Bruzzone November 20 V 2. 0 1

UMTS Architecture A UMTS System comprises three main parts: • Core Network (CN) • UMTS Terrestrial Radio Access Network (UTRAN) • The User Equipment (UE) CN Iu UTRAN Uu UE UTRAN CN UE November 20 Raul Bruzzone UMTS Terrestrial Radio Access Network Core Network User Equipment 2

System Domains Home Network Domain [ Zu] Cu Uu [Yu] Iu Serving Network Domain USIM Domain Mobile Equipment Domain Access Network Domain User Equipment Domain November 20 Transit Network Domain Core Network Domain Infrastructure Domain ETSI 3

Structure of the UTRA Network Core Network Iu Iu RNS Iur RNS Cells November 20 Source: ETSI 4

UMTS Radio Network Controller Iu RNS RNC Iur Iub Node B Cells November 20 Source: ETSI 5

Serving and Drift Radio Access Networks Core Network Iu Iu DRNS Iur SRNS Cells UE November 20 Source: ETSI 6

Streamlining of the UTRAN Core Network Connection Core Network Iu DRNS Iu SRNS Iur SRNS UE Before SRNS Relocation November 20 Iu Iu After SRNS Relocation Source: ETSI 7

Evolution of the GSM Network towards the UMTS Network: Starting Point (2002) CSE HLR CAP MAP A ISUP MSC GSM BSS Gb UMTS Segment SGSN IP G-MSC GGSN ISUP N-ISDN IP IP networks X. 25 IWU 1 A IWU 1 Gb X. 25 UTRAN Iu November 20 ETSI 8

Evolution of the GSM Network towards the UMTS Network: Introduction of a UMTS Core Network (2005 ? ) CSE HLR CAP A MAP ISUP MSC G-MSC GSM BSS Gb UMTS Segment IP GGSN N-ISDN IP IP networks X. 25 IWU 1 A UTRAN Iu November 20 SGSN ISUP IWU 1 Gb X. 25 UMTS CN ETSI 9

Terrestrial Radio Access Network Architecture Summary • UMTS is composed of Core Network, Radio Access Network and User Equipment. • The Radio Access Network (UTRAN) handles radio link connections, enabling Base Station handover. • Handover management is done at the UTRAN Controller. • The UMTS Fixed Network will evolve from the GSM Network model, following several phases. November 20 Raul Bruzzone 10