WCDMA System Architecture

WCDMA System Architecture
Abbreviation list
- WCDMA: Wideband Code Division Multiple Access
- CN:Core Network
- UTRAN:UMTS Terrestrial Radio Access Network
- UMTS:Universal Mobile Telecommunications System
- UE:User equipment
- RNC: Radio Network Controller
- RNS: Radio Network Subsystem
- CS: Circuit Switch
- PS:Packet Switch
- Uu: the Uu interface, UMTS air interface, which links the User Equipment to UMTS Terrestrial Radio Access Network in a UMTS network.
- Iu:>
- Iub:>
- Iur:>
The logical connections between the network elements are known as interfaces. The interface between the RNC and the Circuit Switched Core Network (CS-CN) is called Iu-CS and between the RNC and the Packet Switched Core Network is called Iu-PS. Other interfaces include Iub (between the RNC and the Node B) and Iur (between RNCs in the same network). Iu interfaces carry user traffic (such as voice or data) as well as control information (see Protocols), and Iur interface is mainly needed for soft handovers involving 2 RNCs though not required as the absence of Iur will cause these handovers to become hard handovers.
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