Wireless Oom » imsi

UMTS address

wirelessoom — Sun, 26 Jul 2009 16:28:36 +0000

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

wirelessoom — Sun, 26 Jul 2009 16:00:42 +0000

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).

wirelessoom — Sun, 26 Jul 2009 15:58:19 +0000

The IMSI identifies the subscriber (USIM) within the network.

This is the permanent address stored in HLR.

IMSI =MCC (mobile country code) + MNC (mobile network code) + MSIN (mobile subscriber identification number)

15 bits

MCC + MNC is PLMN id.

wirelessoom — Sun, 26 Jul 2009 15:49:21 +0000

CN address has three types:

1. IMSI

2. TMSI

3. P-TMSI