name: TMSI
full_form: Temporary Mobile Subscriber Identity
context: to use the last received TMSI over IMSI/IMEI when identification towards MME is needed. 2) Countermeasures against tracking a user between different LTE_ACTIVE and LTE_IDLE sessions In order to prevent that a currently valid RNTI (which may be allocated insecurely) cannot be linked to the future TMSI i.e. via TMSI disclosures via MM-signalling in LTE_IDLE (e.g. periodic TA update) after the transition from LTE_ACTIVE to LTE_IDLE, it is necessary to perform TMSI reallocation after having activated NAS ciphering by the core network. Requirement-4: The TMSI shall be re-allocated after each transition to LTE_ACTIVE transition when having activated NAS-security (and shall be transported confidentiality protected to the UE). Editorâs Note: It needs to be investigated whether it is sufficient to reallocate the TMSI on each cell change (rather than change to LTE_ACTIVE) in order to reduce NAS-signalling overhead. It needs also be studied how frequent these transitions can be. In this case the
description: Temporary Mobile Subscriber Identity (TMSI) is a parameter used to identify a mobile subscriber temporarily, especially in scenarios where IMSI/IMEI identification is not feasible or secure.
explanation: The text describes TMSI as a parameter used for temporary subscriber identification under specific network conditions. This aligns with the definition of a Parameter as a configurable value within a system.
section_title: 5.1.2.2	Countermeasures
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