| IMSI |
International Mobile Subscriber Identity |
Unique identification of mobile (LTE) subscriber
Network (MME) gets the PLMN of the subscriber |
IMSI (not more than 15 digits) = PLMN ID + MSIN = MCC + MNC + MSIN |
P |
| PLMN ID |
Public Land Mobile Network IdentifierPublic Land Mobile Network Identifier |
Unique identification of PLMN |
PLMN ID (not more than 6 digits) = MCC + MNC |
P |
| MCC |
Mobile Country Code |
assigned by ITU |
3 digits |
P |
| MNC |
Mobile Network Code |
assigned by National Authority |
2~3 digits |
P |
| MSIN |
Mobile Subscriber Identification Number |
assigned by operator |
9~10 digits |
P |
| GUTI |
Globally Unique Temporary UE Identity |
To identify a UE between the UE and the MME on behalf of IMSI for security reason |
GUTI (not more than 80 bits) = GUMMEI + M-TMSI |
T |
| TIN |
Temporary Identity used in Next Update |
GUTI is stored in TIN parameter of UE¡¯s MM context. TIN indicates which temporary ID will be used in the next update |
TIN = GUTI |
T |
| S-TMSI |
SAE Temporary Mobile Subscriber Identity |
To locally identify a UE in short within a MME group (Unique within a MME Pool) |
S-TMSI (40 bits) = MMEC + M-TMSI |
T |
| M-TMSI |
MME Mobile Subscriber Identity |
Unique within a MME |
32 bits |
T |
| GUMMEI |
Globally Unique MME Identity |
To identify a MME uniquely in global
GUTI contains GUMMEI |
GUMMEI (not more than 48 bits)= PLMN ID + MMEI |
P |
| MMEI |
MME Identifier |
To identify a MME uniquely within a PLMN
Operator commissions at eNB |
MMEI (24 bits) = MMEGI + MMEC |
P |
| MMEGI |
MME Group Identifier |
Unique within a PLMN |
16 bits |
P |
| MMEC |
MME Code |
To identify a MME uniquely within a MME Group.
S-TMSI contains MMEC |
8 bits |
P |
| C-RNTI |
Cell- Radio Network Temporary Identifier |
To identify an UE uniquely in a cell |
0x0001 ~ 0xFFF3 (16 bits) |
T |
| eNB S1AP UE ID |
eNB S1 Application Protocol UE ID |
To uniquely identify UE on S1- MME Interface in eNB |
32-bit Integer (0 .. 232 - 1) |
T |
| MME S1AP UE ID |
MME S1 Application Protocol UE ID |
To uniquely identify UE on S1- MME Interface in MME |
32-bit Integer (0 .. 232 - 1) |
T |
| IMEI |
International Mobile Equipment Identity |
To identify a ME (Mobile Equipment) uniquely |
IMEI (15 digits) = TAC + SNR + CD |
P |
| IMEI/SV |
IMEI/Software Version |
To identify a ME (Mobile Equipment) uniquely |
IMEI/SV (16 digits) = TAC + SNR + SVN |
P |
| ECGI |
E-UTRAN Cell Global Identifier |
To identify a Cell in global (Globally Unique)
EPC can know UE location based of ECGI |
ECGI (not more than 52 bits) = PLMN I D+ ECI |
P |
| ECI |
E-UTRAN Cell Identifier |
To identify a Cell within a PLMN |
ECI (28 Bits) = eNB ID + Cell ID |
P |
| Global eNB ID |
Global eNodeB Identifier |
To identify an eNB in global (Globally Unique) |
Global eNB ID (not more than 44 bits) = PLMN ID + eNB ID |
P |
| eNB ID |
eNodeB Identifier |
To identify an eNB within a PLMN |
20 bits |
P |
| P-GW ID |
PDN GW Identity |
To identify a specific PDN GW (P-GW)
HSS assigns P-GW for PDN (IP network) connection of each UE |
IP address (4 bytes) or FQDN (variable length) |
P |
| TAI |
Tracking Area Identity |
To identify Tracking Area
Globally unique |
TAI (not more than 32 bits) = PLMN ID + TAC |
P |
| TAC |
Tracking Area Code |
To indicate eNB to which Tracking Area the eNB belongs (per Cell)
Unique within a PLMN |
16 bits |
P |
| TAI List |
Tracking Area Identity List |
UE can move into the cells included in TAL list without location update (TA update)
Globally unique |
{TAI} (variable length) |
P |
| PDN ID |
Packet Data Network Identity |
To identify an PDN (IP network), that mobile data user wants to communicate with
PDN Identity (APN) is used to determine the P-GW and point of interconnection with a PDN
With APN as query parameter to the DNS procedures, the MME will receive a list of candidate P-GWs, and then a P-GW is selected by MME with policy |
PDN Identify = APN = APN.NI + APN.OI (variable length) |
P |
| EPS Bearer ID |
Evolved Packet System Bearer Identifier |
To identify an EPS bearer (Default or Dedicated) per an UE |
4 bits |
T |
| E-RAB ID |
E-UTRAN Radio Access Bearer Identifier |
To identify an E-RAB per an UE |
4 bits |
T |
| DRB ID |
Data Radio Bearer Identifier |
To identify a DRB per an UE |
4 bits |
T |
| LBI |
Linked EPS Bearer ID |
To identify the default bearer associated with a dedicated EPS bearer |
4 bits |
T |
| TEID |
Tunnel End Point identifier |
To identify the end point of a GTP tunnel when the tunnel is established |
32 bits |
T |
| P: Permanent T: Temporary |
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