7.7.53 International Mobile Equipment Identity (and Software Version) (IMEI(SV))
29.0603GPPGeneral Packet Radio Service (GPRS)GPRS Tunnelling Protocol (GTP) across the Gn and Gp interfaceRelease 17TS
The structure of the IMEI and IMEISV are defined in clause 6.2 of 3GPP TS 23.003 [2]. The "IMEI(SV)" field shall contain the IMEISV if it is available. If only the IMEI is available, then the IMEI shall be placed in the IMEI(SV) field and the last semi‑octet of octet 11 shall be set to "1111". Both IMEI and IMEISV are TBCD encoded. Bits 5 to 8 of octet n+3 (where n represents the octet of the IMEI(SV) being encoded) encodes digit 2n, bits 1 to 4 of octet n+3 encodes digit 2n-1 (i.e the order of digits is swapped in each octet compared to the digit order defined in 3GPP TS 23.003 [2]). Digits are packed contiguously with no internal padding.
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 |
Type = 154 (Decimal) |
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|
2-3 |
Length = 8 |
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4-11 |
IMEI(SV) |
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Figure 7.7.53.1: IMEI(SV) Information Element