Wireless Oom

UMTS address can be classified
1. CN address
- IMSI
-TMSI
-P-TMSI
2. UTRAN address
- S-RNTI
- U-RNTI
- C-RNTI
3. UE ID dedicated channels

TMSI (temporary IMSI) together with LAI uniquely identifies the subscriber.
TMSI is assigned by the network and is 32 bits.
It is used to mask the identity of the subscriber and hide the subscriber’s true identity (IMSI).

The IMSI identifies the subscriber (USIM) within the network.
This is the permanent address stored in HLR.
IMSI = MNC (mobile network code) + MCC (mobile country code) +MSIN (mobile subscriber identification number)
15 bits
MNC + MCC is PLMN id.

CN address has three types:
1. IMSI
2. TMSI
3. P-TMSI