4.2.91 EF_EPSLOCI (EPS location information)

31.1023GPPCharacteristics of the Universal Subscriber Identity Module (USIM) applicationRelease 17TS

If service n°85 is "available", this file shall be present.

This EF contains the following EPS location information:

‑ Globally Unique Temporary Identifier (GUTI);

‑ Last visited registered Tracking Area Identity (TAI);

‑ EPS update status.

Identifier: ‘6FE3’		Structure: transparent			Optional
SFI: ‘1E’
File size: 18 bytes			Update activity: high
Access Conditions: READ PIN UPDATE PIN DEACTIVATE ADM ACTIVATE ADM
Bytes	Description			M/O		Length
1 to 12	GUTI			M		12 bytes
13 to17	Last visited registered TAI			M		5 bytes
18	EPS update status			M		1 byte

‑ GUTI.

Contents:

Globally Unique Temporary Identifier.

Coding:

as the GUTI part of the EPS mobile identity information element defined in TS 24.301 [51]. Byte 1 corresponds to "octet 2" of an EPS mobile identity information element containing a GUTI. Byte 12 corresponds to "octet 13" of an EPS mobile identity information element information element containing a GUTI.

Byte 1: first byte of GUTI

b8

b7

b6

b5

b4

b3

b2

b1

MSB

‑ Last visited registered TAI

Contents:

Last visited registered Tracking Area Identity.

Coding:

as the content of the tracking area identity information element defined in TS 24.301 [51]. Byte 13 corresponds to "octet 2" of a tracking area identity information element. Byte 17 corresponds to "octet 6" of a tracking area identity information element.

Byte 13: first byte of last visited registered TAI

b8

b7

b6

b5

b4

b3

b2

b1

MSB

‑ EPS update status.

Contents:

status of EPS update according to TS 24.301 [51].

Coding:

byte 18:

Bits: b3 b2 b1.

0 0 0 : UPDATED.

0 0 1 : NOT UPDATED.

0 1 0 : ROAMING NOT ALLOWED.

0 1 1 : reserved.

1 0 0 : reserved.

1 0 1 : reserved.

1 1 0 : reserved.

1 1 1 : reserved.

Bits b4 to b8 are RFU (see TS 31.101 [11]).

Unused bytes shall be set to ‘FF’.