name: SDU
full_form: Signalling data unit
context: PDUs; - Sequence numbering independent of the one in PDCP [only for Unacknowledged Mode (UM) and Acknowledged Mode (AM), not for Transparent Mode (TM)]; - Error Correction through ARQ (AM only); - Segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; - Reassembly of SDU (AM and UM); - Duplicate Detection (AM only); - RLC SDU discard (AM and UM); - RLC re-establishment; - Protocol error detection (AM only). The main services and functions of the PDCP (Packet Data Convergence Protocol) sublayer for the user plane include: - Sequence Numbering; - Header compression and decompression: ROHC only; - Transfer of user data; - Reordering and duplicate detection; - PDCP PDU routing (in case of split bearers); - Retransmission of PDCP SDUs; - Ciphering, deciphering; - PDCP SDU discard; - PDCP re-establishment and data recovery for RLC AM; - Duplication of PDCP PDUs. The main services and functions of the PDCP sublayer for the control plane include: - Sequence Numbering; -
description: Signalling Data Unit (SDU) is a protocol data unit used in the context of Layer 2 protocols, specifically in the Radio Link Control (RLC) and Packet Data Convergence Protocol (PDCP) sublayers. It refers to the data units exchanged between these protocol layers for user plane and control plane communications.
explanation: The provided context from 3GPP TS 21.915 highlights SDU as a key component in the functioning of RLC and PDCP, detailing its role in error correction, segmentation, reassembly, and other Layer 2 related aspects. This classification is based on the protocol's involvement in data transmission rules within telecommunications.
section_title: 5.5.3.4.1	Layer 2 related aspects: MAC, RLC, PDCP user plane, PCP control plane, and SDAP
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biotag_Description: O,B-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,I-Protocol,O,O,O,O,B-Protocol,I-Protocol,I-Protocol,O,O,B-Protocol,I-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O