ID

Meaning

Description

Structure

IMSI

International MobileSubscriber Identity

Unique identification ofmobile (LTE) subscriber Network (MME) gets the PLMN of the subscriber

IMSI (not more than 15digits) = PLMN ID + MSIN = MCC + MNC + MSIN

PLMN ID

Public Land Mobile NetworkIdentifier

Unique identification ofPLMN

PLMN ID (not more than 6digits) = MCC + MNC

MCC

Mobile Country Code

assigned by ITU

3 digits

MNC

Mobile Network Code

assigned by NationalAuthority

2 or 3 digits

MSIN

Mobile SubscriberIdentification Number

assigned by operator

9 or 10 digits

GUTI

Globally Unique Temporary UEIdentity

To identify a UE between theUE and the MME on behalf of IMSI for security reason

GUTI (not more than 80 bits)= GUMMEI + M-TMSI

TIN

Temporary Identity used inNext Update

GUTI is stored in TINparameter of UE抯 MM context. TIN indicates which temporary ID willbe used in the next update.

TIN = GUTI

S-TMSI

SAE Temporary MobileSubscriber Identity

To locally identify a UE inshort within a MME group (Unique within a MME Pool)

S-TMSI (40 bits) = MMEC +M-TMSI

M-TMSI

MME Mobile SubscriberIdentity

Unique within a MME

32 bits

GUMMEI

Globally Unique MME Identity

To identify a MME uniquely in global

GUTI contains GUMMEI

GUMMEI (not more than 48bits)= PLMN ID + MMEI

MMEI

MME Identifier

To identify a 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

MMECode

To identify a MME uniquelywithin a MME Group. S-TMSI contains MMEC8

8 bits

C-RNTI

Cell- Radio NetworkTemporary Identifier

To identify an UE uniquelyin a cell

0x0001 ~ 0xFFF3 (16 bits)

IMEI

International MobileEquipment Identity

To identify a ME (MobileEquipment) uniquely

IMEI (15 digits) = TAC + SNR+ CD

IMEI/SV

IMEI/Software Version

To identify a ME (MobileEquipment) uniquely

IMEI/SV (16 digits) = TAC +SNR + SVN

ECGI

E-UTRAN Cell GlobalIdentifier

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

ECI

E-UTRAN Cell Identifier

To identify a Cell within aPLMN

ECI (28 Bits) = eNB ID +Cell ID

PGWID

PDN GW Identity

To identify a specific PDN GW (P-GW)

HSS assigns P-GW for PDN (IP network) connection ofeach UE

IP address (4 bytes) or FQDN(variable length)

TAI

Tracking Area Identity

To identify Tracking Area

Globally uniqueTAI

TAI (not more than 32 bits)= PLMN ID + TAC P-GW

TAC

Tracking Area Code

To indicate eNB to which Tracking Area the eNBbelongs (per Cell)

Unique within a PLMN16

16 bits

TAIList

Tracking Area Identity List

UE can move into the cells included in TAL listwithout location update (TA update)

Globally unique

Variablelength

PDNID

Packet Data Network Identity

To identify an PDN (IP network), that mobile datauser wants to communicate with

PDN Identity (APN) is used to determine the P-GW andpoint 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 selectedby MME with policy

PDN Identify = APN = APN.NI+ APN.OI (variable length)

EPSBearer ID

Evolved Packet System BearerIdentifier

To identify an EPS bearer(Default or Dedicated) per an UE4

4 bits

E-RAB ID

E-UTRAN Radio Access BearerIdentifier�

To identify an E-RAB per anUE

4 bits

DRBID

Data Radio Bearer Identifier

To identify a DRB per an UE4

4 bits

LBI

Linked EPS Bearer ID

To identify the defaultbearer associated with a dedicated EPS bearer4

4 bits

TEID

Tunnel End Point identifier

To identify the end point ofa GTP tunnel when the tunnel is established

32 bits