The field is provided
by the SGSN/MME and transferred to the S-GW/P-GW
during the IP-CAN bearer activation/modification.
User Location Information
contains the location (e.g. CGI/SAI, ECGI/TAI
or RAI) where the UE is located and used during the transfer of
the data volume captured by the container (applicable only to the
SGW-CDR). This is included in the Traffic data container only if
previous container's change condition is "user location
change". Note the user location information in SGW-CDR
main level contains the location where the UE was when PGW-CDR was opened.
The flags ECGI, TAI,
RAI, SAI and CGI in octet 1 indicate if the corresponding fields
are present in the IE or not. If one of these flags is set to "0",
the corresponding field is not present at all. The respective identities
are defined in 3GPP TS 23.003.
The following subclauses
specify the coding of the different identities. For each identity,
if an Administration decides to include only two digits in the MNC,
then bits 5 to 8 of octet 7 are coded as "1111".
CGI field:
The Location Area Code
(LAC) consists of 2 octets. Bit 8 of Octet 9 is the most significant bit
and bit 1 of Octet 10 the least significant bit. The coding of the
location area code is the responsibility of each administration.
Coding using full hexadecimal representation is used.
The Cell Identity (CI)
consists of 2 octets. Bit 8 of Octet 11 is the most significant
bit and bit 1 of Octet 12 the least significant bit. The coding
of the cell identity is the responsibility of each administration.
Coding using full hexadecimal representation is used.
SAI field:
The Location Area Code
(LAC) consists of 2 octets. Bit 8 of Octet 9 is the most significant bit
and bit 1 of Octet 10 the least significant bit. The coding of the
location area code is the responsibility of each administration.
Coding using full hexadecimal representation is used.
The Service Area Code
(SAC) consists of 2 octets. Bit 8 of Octet 11 is the most significant bit
and bit 1 of Octet 12 the least significant bit. The SAC is defined
by the operator.
RAI field:
The Location Area Code
(LAC) consists of 2 octets. Bit 8 of Octet 9 is the most significant bit
and bit 1 of Octet 10 the least significant bit. The coding of the
location area code is the responsibility of each administration.
Coding using full hexadecimal representation is used.
The Routing Area Code
(RAC) consists of 2 octets. Only Octet 11 contains the RAC. Octet 12
is coded as all 1's (11111111). The RAC is defined by the operator.
TAI field:
The Tracking Area Code
(TAC) consists of 2 octets. Bit 8 of Octet 9 is the most significant bit
and bit 1 of Octet 10 the least significant bit. The coding of the
tracking area code is the responsibility of each administration.
Coding using full hexadecimal representation is used.
ECGI field:
The E-UTRAN Cell Identifier
(ECI) consists of 28 bits. Bit 4 of octet 10 is the most significant
bit and bit 1 of Octet 11 is the least significant bit. The coding
of the E-UTRAN cell identifier is the responsibility of each administration.
Coding using full hexadecimal representation is used.