RFLTE Identifiers: A Comprehensive Guide to LTE IDs
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This page covers LTE IDs (Identifiers) such as PLMN ID, IMSI, MNC, MCC, GUTI, MSIN, TIN, S-TMSI, M-TMSI, GUMMEI, MMEI, MMEGI, MMEC, C-RNTI, IMEI, IMEI/SV, ECGI, EPS Bearer ID, PGW ID, ECI, TAC, TAI, PDN ID, TAI List, DRB ID, LBI, E-RAB ID, and TEID.
| LTE IDs (Identifiers) | Description | Structure with size |
|---|---|---|
| PLMN ID | Public Land Mobile Network Identifier. Unique identification of a PLMN. | PLMN ID (not more than 6 digits) = MCC + MNC |
| IMSI | International Mobile Subscriber Identity. Unique ID of a mobile subscriber. The network gets the PLMN of the subscriber. | IMSI (not more than 15 digits) = PLMN ID + MSIN = MCC + MNC + MSIN |
| MNC | Mobile Network Code. Assigned by the National Authority. | 2 or 3 digits |
| MCC | Mobile Country Code. Assigned by the ITU. | 3 digits |
| GUTI | Globally Unique Temporary UE Identity. Used to identify a UE between the UE and the MME on behalf of the IMSI for security reasons. | GUTI (not more than 80 bits) = GUMMEI + M-TMSI |
| MSIN | Mobile Subscriber Identification Number. Assigned by the operator. | 9 or 10 digits |
| TIN | Temporary Identity used in Next Update. GUTI is stored in the TIN parameter, which is the MM context of the LTE UE. TIN indicates which temporary ID will be used in the next update. | TIN= GUTI |
| S-TMSI | SAE Temporary Mobile Subscriber Identity. Used to locally identify a UE in short within an MME group (Unique within an MME Pool). | S-TMSI (40 bits) = MMEC + M-TMSI |
| M-TMSI | MME temporary mobile subscriber identity. | 32 bits. This is unique within an MME. |
| GUMMEI | Globally Unique MME Identity. Used to identify an MME uniquely in global. GUTI contains GUMMEI. | GUMMEI (not more than 48 bits) = PLMN ID + MMEI |
| MMEI | MME Identifier. Used to identify an MME uniquely within a PLMN. Operator commissions at eNBMMEI. | MMEI (24 bits) = MMEGI + MMEC |
| MMEGI | MME Group Identifier. Unique within a PLMN. | 16 bits |
| MMEC | MME Code. Used to identify an MME uniquely within an MME Group. S-TMSI contains MMEC. | 8 bits |
| C-RNTI | Cell- Radio Network Temporary Identifier. Used to identify a UE uniquely in a cell. | 0x0001 ~ 0xFFF3 (16 bits) |
| IMEI | International Mobile Equipment Identity. Used to identify a ME (Mobile Equipment) uniquely. | Size of 15 digits; IMEI=TAC+SNR+CD |
| IMEI/SV | IMEI/Software Version. Used to identify a ME (Mobile Equipment) uniquely. | Size=16 digits; IMEI/SV=TAC+SNR+SVN |
| ECGI | E-UTRAN Cell Global Identifier. Used to identify a Cell globally (Globally Unique). EPC can know UE location based on ECGI. | ECGI (not more than 52 bits) = PLMN ID + ECI |
| ECI | E-UTRAN Cell Identifier. Used to identify a Cell within a PLMN. | ECI (28 Bits) = eNB ID + Cell ID |
| PGW ID | PDN GW Identity. Used to identify a specific PDN GW (P-GW). HSS assigns P-GW for PDN connection of each UE. | IP address (4 bytes) or FQDN (variable length) |
| TAI | Tracking Area Identity. Used to identify a Tracking Area Globally. | TAI (not more than 32 bits) = PLMN ID + TAC P-GW |
| TAC | Tracking Area Code. Used to indicate to which Tracking Area the eNB belongs (per Cell). Unique within a PLMN. | 16 bits |
| TAI List | Tracking Area Identity List. UE can move into the cells included in the TAL list without location update (TA update). | Globally unique Variable length |
| PDN ID | Packet Data Network Identity. | PDN Identify = APN = APN.NI + APN.OI (variable length) |
| EPS Bearer ID | Evolved Packet System Bearer Identifier. Used to identify an EPS bearer (Default or Dedicated) per UE. | 4 bits |
| E-RAB ID | E-UTRAN Radio Access Bearer Identifier. Used to identify an E-RAB per UE. | 4 bits |
| DRB ID | Data Radio Bearer Identifier. Used to identify a DRB per UE. | 4 bits |
| LBI | Linked EPS Bearer ID. Used to identify the default bearer associated with a dedicated EPS bearer. | 4 bits |
| TEID | Tunnel End Point identifier. Used to identify the end point of a GTP tunnel when the tunnel is established. | 32 bits |
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