8.47 GUTI
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
The GUTI is coded as depicted in Figure 8.47-1.
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 |
Type = 117 (decimal) |
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2 to 3 |
Length = n |
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4 |
Spare |
Instance |
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5 |
MCC digit 2 |
MCC digit 1 |
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6 |
MNC digit 3 |
MCC digit 3 |
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7 |
MNC digit 2 |
MNC digit 1 |
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8 to 9 |
MME Group ID |
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10 |
MME Code |
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11 to (n+4) |
M-TMSI |
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Figure 8.47-1: GUTI
If an Administration decides to include only two digits in the MNC, then bits 5 to 8 of octet 6 are coded as "1111".
The "MME Group ID", "MME Code" and "M-TMSI" are specified in 3GPP TS 23.003 [2].