UMTS Terrestrial Radio access network - wikipedia UMTS Terrestrial Radio access network UTRAN architecture UTRAN ( short for `` Universal Terrestrial Radio Access Network '' ) is a collective term for the network and equipment that connects mobile handsets to the public telephone network or the Internet. It contains the base stations, which are called Node B 's and Radio Network Controllers ( RNCs ) which make up the UMTS radio access network. This communications network, commonly referred to as 3G ( for 3rd Generation Wireless Mobile Communication Technology ), can carry many traffic types from real - time Circuit Switched to IP based Packet Switched. The UTRAN allows connectivity between the UE ( user equipment ) and the core network. The RNC provides control functionalities for one or more Node Bs. A Node B and an RNC can be the same device, although typical implementations have a separate RNC located in a central office serving multiple Node Bs. Despite the fact that they do not have to be physically separated, there is a logical interface between them known as the Iub. The RNC and its corresponding Node Bs are called the Radio Network Subsystem ( RNS ). There can be more than one RNS present in a UTRAN. There are four interfaces connecting the UTRAN internally or externally to other functional entities : Iu, Uu, Iub and Iur. The Iu interface is an external interface that connects the RNC to the Core Network ( CN ). The Uu is also external, connecting the Node B with the User Equipment ( UE ). The Iub is an internal interface connecting the RNC with the Node B. And at last there is the Iur interface which is an internal interface most of the time, but can, exceptionally be an external interface too for some network architectures. The Iur connects two RNCs with each other. See also UMTS - Universal Mobile Telecommunications System GERAN - GSM EDGE Radio Access Network References Jump up ^ Overview of The Universal Mobile Telecommunication System by Petri Possi, UMTS World, July 2002 Jump up ^ 3G Networking Protocols : The Bridge Between the Air Interface and the UTRAN by Agilent Technologies Jump up ^ UTRAN overall description ( Release 11 ) by 3rd Generation Partnership Project ; Technical Specification Group Radio Access Network, December 2012 Cellular network standards List of mobile phone generations 0G ( radio telephones ) MTS MTA - MTB - MTC - MTD IMTS AMTS OLT Autoradiopuhelin B - Netz Altai AMR 1G ( 1985 ) AMPS family AMPS ( TIA / EIA / IS - 3, ANSI / TIA / EIA - 553 ) N - AMPS ( TIA / EIA / IS - 91 ) TACS ETACS Other NMT C - 450 Hicap Mobitex DataTAC 2G ( 1992 ) GSM / 3GPP family GSM CSD HSCSD 3GPP2 family cdmaOne ( TIA / EIA / IS - 95 and ANSI - J - STD 008 ) AMPS family D - AMPS ( IS - 54 and IS - 136 ) Other CDPD iDEN PDC PHS 2G transitional ( 2.5 G, 2.75 G ) GSM / 3GPP family GPRS EDGE / EGPRS ( UWC - 136 / 136HS / TDMA - EDGE ) 3GPP2 family CDMA2000 1X ( TIA / EIA / IS - 2000 ) CDMA2000 1X Advanced Other WiDEN DECT 3G ( 2003 ) 3GPP family UMTS UTRA - FDD / W - CDMA UTRA - TDD LCR / TD - SCDMA UTRA - TDD HCR / TD - CDMA 3GPP2 family CDMA2000 1xEV - DO Release 0 ( TIA / IS - 856 ) 3G transitional ( 3.5 G, 3.75 G, 3.9 G ) 3GPP family HSPA HSDPA HSUPA HSPA+ LTE ( E-UTRA ) 3GPP2 family CDMA2000 1xEV - DO Revision A ( TIA / EIA / IS - 856 - A ) EV - DO Revision B ( TIA / EIA / IS - 856 - B ) EV - DO Revision C IEEE family Mobile WiMAX IEEE 802.16 e Flash - OFDM iBurst IEEE 802.20 4G ( 2013 ) ( IMT Advanced ) 3GPP family LTE Advanced ( E-UTRA ) LTE Advanced Pro ( 4.5 G Pro / pre-5G / 4.9 G ) IEEE family WiMAX ( IEEE 802.16 m ) WiMax 2.1 ( LTE - TDD ) 5G ( 2020 ) ( IMT - 2020 ) ( Under development ) LTE 5G - NR Related articles Cellular networks Mobile telephony History List of standards Comparison of standards Channel access methods Spectral efficiency comparison table Cellular frequencies ( Bands : GSM UMTS LTE ) Mobile broadband NGMN Alliance MIMO VoLTE Retrieved from `` https://en.wikipedia.org/w/index.php?title=UMTS_Terrestrial_Radio_Access_Network&oldid=754054530 '' Categories : Code division multiple access UMTS ( telecommunication ) Talk About Wikipedia Català Deutsch Español Français Italiano Українська 中文 Edit links This page was last edited on 10 December 2016, at 16 : 37. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: the interface that connects node b and rnc in umts is
Answer: UTRAN (short for "Universal Terrestrial Radio Access Network")