name: CU
full_form: Centralised unit
context: transmission points. - Flow control is in the CU and for that a buffer in the CU is needed. The TX buffer is placed in the DU, so that the flow controlled traffic from the CU can be buffered before being transmitted. Flow control can be done depending on fronthaul conditions - As Rx RLC is placed in CU, there is no additional transmission delay of PDCP/RLC reestablishment procedure when submitting the RLC SDUs to PDCP - This option does not induce any transport constraint, e.g. transport network congestion. MAC submits RLC PDUs as a whole packet to RLC rather than RLC sending RLC SDUs to PDCP. Cons: - Compared to the case where RLC is not split, STATUS PDU of AM Rx RLC may lead to additional time delay. Because STATUS PDU must be submitted through PDCP-Tx RLC interface from CU to DU before Tx RLC in DU transmits it over air interface, which may lead to additional transport delay. - Due to performing flow control in the CU and RLC Tx in the DU two buffers are needed for transmission,
description: The Centralised Unit (CU) is a network function responsible for managing and controlling radio access network functions, including flow control, buffer management, and transmission of RLC PDUs. It plays a crucial role in the 5G radio access network architecture.
explanation: The CU is classified as a Network Function based on its role in controlling and managing radio access network functions, as highlighted by the context from 3GPP TS 38.801. The text describes the CU's responsibilities, including flow control, buffer management, and transmission of RLC PDUs, which are all characteristic of a network function.
section_title: 11.1.2.3Option 3 (High RLC/Low RLC Split)
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