UMTS Terrestrial Radio Access Network

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Schematic representation of the UMTS system architecture

The UMTS Terrestrial Radio Access Network , or UTRAN for short , is one of the hierarchically structured radio access networks to a cellular network based on the UMTS standard. It is also known as the Radio Network System (RNS). Other possible radio access networks are GERAN (GSM EDGE Radio Access Network, also: BSS) and E-UTRAN (Evolved UTRAN).

A UTRAN consists of one or more RNS, each RNS consists of at least one base station (which is called NodeB in the context of UMTS ), and exactly one Radio Network Controller (RNC)

The RNS transfers the data to and from the core network, manages the radio resources, transfers the connection when there is a cell change and takes over the coding of the radio channels. It communicates with the core network (CN) via the Iu interface and with the end devices (user equipment, UE) via the Uu interface. Different RNS communicate with each other via the Iur interface.

The WCDMA multiplexing of the transmissions realizes many mechanisms that were not provided for in GSM and were also not required. With UTRAN there are new restriction and access procedures that were only necessary for the UMTS network.

An important property of the UTRAN network is the macro diversity , in which the end device (e.g. the mobile phone) transmits exactly the same information over two channels, so that the radio network controller (the "ground station") receives the most error-free signal possible from the can calculate both transfers. Here, the terms are often combining ( Engl. And splitting combine) ( Engl. Share) used to describe the processing of two data streams. The macrodiversity guarantees , among other things, a higher cell capacity of the UMTS network and a better distribution of transmission power.

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  1. ↑ 3GPP TS 23.002: Network architecture, chap. 4.2: The Access Network (AN) entities ( English , ZIP / DOC, 2.3 MB) on September 29, 2009. Retrieved on December 8 of 2009.
  2. ↑ 3GPP TS 23.002: Network architecture, chap. 4.2.2: The Radio Network System (RNS) ( English , ZIP / DOC; 2.3 MB) September 29, 2009. Accessed December 8, 2009.
  3. ↑ 3GPP TS 25.401: UTRAN overall description, chap. 5: UMTS General architecture ( English , ZIP / DOC; 430 KB) December 16, 2008. Accessed December 8, 2009.

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