Section: 2.10.2.2.2 Mapping in the UE
Content: When the UE moves from the E-UTRAN to 5GS, the UE needs to map the GUTI to a 5G-GUTI to be sent to the AMF. The mapping of the GUTI to a 5G-GUTI shall be performed as follows: E-UTRAN <MCC> maps to 5GS <MCC> E-UTRAN <MNC> maps to 5GS <MNC> E-UTRAN <MME Group ID> maps to 5GS <AMF Region ID> and part of 5GS <AMF Set ID> as follows: - 8 bits of the E-UTRAN <MME Group ID> starting at bit 15 and down to bit 8 are mapped into bit 7 and down to bit 0 of the 5GS <AMF Region ID>; - 8 bits of the E-UTRAN <MME Group ID> starting at bit 7 and down to bit 0 are mapped into bit 9 and down to bit 2 of the 5GS <AMF Set ID>;E-UTRAN <MME Code> maps to 5GS <AMF Set ID> and 5GS <AMF Pointer> as follows: - 2 bits of the E-UTRAN <MME Code> starting at bit 7 and down to bit 6 are mapped into bit 1 and down to bit 0 of the 5GS <AMF Set ID>; - 6 bits of the E-UTRAN <MMEC Code> starting at bit 5 and down to bit 0 are mapped into bit 5 and down to bit 0 of the 5GS <AMF Pointer >; E-UTRAN <M-TMSI> maps to 5GS <5G-TMSI>