UMTS/3G Architecture
The UMTS network can be broadly divided into- User Equipment(UE) Radio Network Subsystem(RNS) Core Network(CN) UMTS/3G Architecture User Equipment(UE) : USIM(Universal Subscriber Identity Module) :Same as SIM card, But in case of UMTS it is termed as USIM. ME(Mobile Equipment) :Hardware used by subscriber containing IMEI. 2. Radio Network Subsystem(RNS) : Also known as UMTS Radio Access Network,(UTRAN).It provides and manage the air interface for the overall network. Node B : Node B corresponds to BTS in GSM. RNC(Radio Network Controller) :It controls Node B in 3G telecom system. 3. Core Network(CN) : Circuit Switch Domain :A permanent channel for the duration of the call. MSC(Mobile Switching Centre) :it manage the circuit switched calls under way. GMSC(Gateway Mobile Switching Centre) :Responsible for obtaining the location of subscriber, so that calls from other external networks can be delivered correctly. In practice, the GMSC is just a functi