GUTI (Globally Unique Temporary UE Identity)

3GPP TS 23.003 V9.3.0 (2010-06)

The format and size of the GUTI is therefore the following:
<GUTI> = <GUMMEI><M-TMSI>,
 where <GUMMEI> = <MCC><MNC><MME Identifier>
 and <MME Identifier> = <MME Group ID><MME Code>
MCC and MNC shall have the same field size as in earlier 3GPP systems.
M-TMSI shall be of 32 bits length.
MME Group ID shall be of 16 bits length.
MME Code shall be of 8 bits length.
 

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