name: TMSI
full_form: Temporary Mobile Subscriber Identity
context: When a UE moves from 5GS to an E-UTRAN, the UE needs to map the 5G-GUTI to a GUTI. The mapping of the 5G-GUTI to a GUTI shall be done as follows: 5GS <MCC> maps to E-UTRAN <MCC> 5GS <MNC> maps to E-UTRAN <MNC> 5GS <AMF Region ID> and 5GS <AMF Set ID> map to E-UTRAN <MME Group ID> and part of E-UTRAN <MME Code> as follows: - 8 bits of the 5GS <AMF Region ID> starting at bit 7 and down to bit 0 are mapped into bit 15 and down to bit 8 of the E-UTRAN <MME Group ID>; - 8 bits of the 5GS <AMF Set ID> starting at bit 9 and down to bit 2 are mapped into bit 7 and down to bit 0 of the E-UTRAN <MME Group ID>; - 2 bits of the 5GS <AMF Set ID> starting at bit 1 and down to bit 0 are mapped into bit 7 and down to bit 6 of the E-UTRAN <MME Code>; 5GS <AMF Pointer> maps to part of E-UTRAN <MME Code> as follows: - 6 bits of the 5GS <AMF Pointer> starting at bit 5 and down to bit 0 are mapped into bit 5 and down to bit 0 of the E-UTRAN <MME Code>. 5GS <5G-TMSI> maps to to E-UTRAN <M-TMSI>
description: Temporary Mobile Subscriber Identity (TMSI) is a unique identifier assigned to a mobile subscriber in a cellular network. It is used to identify the subscriber and facilitate communication between the subscriber's device and the network. The TMSI is mapped from the 5G-GUTI when a UE moves from 5GS to an E-UTRAN, involving specific bit mappings for MCC, MNC, AMF Region ID, AMF Set ID, AMF Pointer, and 5G-TMSI.
explanation: TMSI is classified under the entity type 'Telecommunications Identity' because it is a unique identifier used in cellular networks to identify subscribers and facilitate communication. The detailed mapping process from 5G-GUTI to TMSI highlights its role in ensuring seamless connectivity between different network technologies.
section_title: 2.10.2.1.2 Mapping in the UE
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biotag_Description: B-Parameter,I-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,B-Parameter,O,O,B-Device,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Network Function,O,O,B-Network Function,O,O,O