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3GPP Glossaries

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|   TAC   |   TAI   |   TLLI   |   TMSI   |

 

Source:   TS 23.003, clause 19.4.2.3

The Tracking Area Code (TAC) is a fixed length code (of 2 octets) identifying a Tracking Area within a PLMN. This part of the tracking area identification shall be coded using a full hexadecimal representation. The hexadecimal values 0000 and FFFE are reserved.

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Source:   TS 23.003, clause 19.4.2.3

The Tracking Area Identity (TAI) consists of a Mobile Country Code (MCC), Mobile Network Code (MNC), and Tracking Area Code (TAC).

A subdomain name can be derived from the TAI. This shall be done by adding the label "tac" to the beginning of the Home Network Realm/Domain and encoding the TAC as a sub-domain. This is called the TAI FQDN. The TAI FQDN shall be constructed as follows:

tac‑lb<TAC‑lb>.tac-hb<TAC‑hb>.tac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org

The TAC is a 16‑bit integer. The <TAC‑hb> is the hexadecimal string of the most significant byte in the TAC and the <TAC‑lb> is the hexadecimal string of the least significant byte. If there are less than 2 significant digits in <TAC‑hb> or <TAC‑lb>, "0" digit(s) shall be inserted at the left side to fill the 2 digit coding.
3GPP TAI Structure

 

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Source:   TS 23.003, clause 2.6

For addressing on resources used for GPRS, a Temporary Logical Link Identity (TLLI) is used. The TLLI to use is built by the MS either on the basis of the P‑TMSI (local or foreign TLLI), or directly (random TLLI).

The TLLI consists of 32 bits.

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Source:   TS 23.003, clause 2.4

In order to support the subscriber identity confidentiality service, the VLRs, SGSNs and MME may allocate Temporary Mobile Subscriber Identities (TMSI) to visiting mobile subscribers. The VLR, SGSN and MME must be capable of correlating an allocated TMSI with the IMSI of the MS to which it is allocated.

An MS may be allocated three TMSIs, one for services provided through the MSC, one for services provided through the SGSN (P-TMSI) and one for the services provided via the MME (M-TMSI).

Since the TMSI has only local significance (i.e. within a VLR and the area controlled by a VLR, or within an SGSN and the area controlled by an SGSN, or within an MME and the area controlled by an MME), the structure and coding of it can be chosen by agreement between operator and manufacturer in order to meet local needs.

The TMSI consists of 4 octets. It can be coded using a full hexadecimal representation.

The TMSI shall be allocated only in ciphered form. See TS 43.020 and TS 33.102.

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