UMTS Network Architecture
This tutorial on UMTS covers network architecture in UMTS system.
As shown in the figure there are three main components in UMTS network architecture,
User Equipments is composed of Mobile Equipment (ME) and USIM. Radio Access Network is composed of NodeB and RNC. Core Network is composed of circuit switched and packet switched functional modules. For Circuit switched (CS) operations MSC and GMSC along with database modules such as VLR, HLR will be available. For packet switched (PS) operations SGSN and GGSN will serve the purpose. GMSC will be connected with PSTN/ISDN in CS case. GGSN is connected with Packet data Network (PDN) for PS case.
Interfaces between these entities are summarized below.
Uu interface between UE and NodeB
Iub interface between NodeB and RNC
Iur interface between RNC and RNC
Iu-CS interface between RNC and MSC
Iu-PS interface between RNC and SGSN