name: TNL
full_form: Transport Network Layer
context: Radio Network Temporary Identities (RNTI) are used as UE identifiers within UTRAN/GERAN Iu mode and in signalling messages between UE and UTRAN/GERAN Iu mode. Six types of RNTI exist: 1) Serving RNC/BSS RNTI (s-RNTI); 2) Drift RNC/BSS RNTI (d-RNTI); 3) Cell RNTI (c-RNTI); 4) UTRAN/GERAN RNTI (u-RNTI); 5) [TDD â DSCH RNTI (DSCH-RNTI)]; 6) HS-DSCH RNTI (HS-DSCH RNTI); 7) E-DCH RNTI (E-RNTI); s-RNTI is used: - by UE to identify itself to the Serving RNC/BSS; - by SRNC/SBSS to address the UE/MS; - by DRNC/DBSS to identify the UE to Serving RNC. s-RNTI is allocated for all UEs having a RRC connection, it is allocated by the Serving RNC/BSS and it is unique within the Serving RNC/BSS. s-RNTI is reallocated always when the Serving RNC/BSS for the RRC connection is changed. d-RNTI is used: - by serving RNC/BSS to identify the UE to Drift RNC/BSS. NOTE: The d-RNTI is never used on Uu. d-RNTI is allocated by drift RNC/BSS upon drift UE contexts establishment and it shall be unique within the
description: The Transport Network Layer (TNL) manages and updates transport network addresses. It ensures seamless communication between network components like gNB-CU-CP and gNB-CU-UP.
explanation: The text explicitly states that TNL is a layer in the network architecture responsible for address management and communication between network components, aligning with the definition of a layer in telecommunications.
section_title: 8.5.1.2	Successful Operation
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biotag_Description: O,B-Network,I-Network,I-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O