name: DU
full_form: Distributed Unit
context: The signalling flow for Initial Registration for network sharing with multiple cell-ID broadcast with separate per-PLMN signalling is shown in Figure 8.11.2-1. In this example message flow - the UE is assumed to not provide an ue-Identity from which the DU is able to deduce the PLMN ID. - each F1-C interface instance uses a separate signalling transport or share signalling transport with other F1-C interface instances. - the gNB-DUA/B entity shown in Figure 8.11.2-1 is a simplified representation of the gNB-DUA of PLMN A, the gNB DUB of PLMN B and respective radio resources of the shared cell. Figure 8.11.2-1: UE Initial Access procedure and network sharing with multiple cell-ID broadcast NOTE: Steps 1-5 are defined in clause 8.1. Note, that the selectedPLMN-Identity is provided in step 5. 6. The gNB-DUA sends the F1AP UE CONTEXT RELEASE REQUEST message to the gNB-CUA. including a Cause set to "PLMN not served by the CU". 7. The gNB-DUB sends the F1AP INITIAL UL RRC MESSAGE to the gNB-CUB. including the NR CGI associated with PLMNB, the C-RNTI indicated by the gNB-DUA at step 2, and the RRC-Container IE and the RRC-Container-RRCSetupComplete IE with the RRC message received in step1 and step 5 respectively. The RRC-Container-RRCSetupComplete IE are included in the INITIAL UL RRC MESSAGE TRANSFER for the case of network sharing and shall contain the RRC messages received via the RRC UL-DCCH-Message IE from the UE, but never previously sent to the gNB-CUB. 8. The gNB-CUA sends the UE CONTEXT RELEASE COMMAND message to the gNB-DU. 9. The gNB-DU sends the UE CONTEXT RELEASE COMPLETE message to the gNB-CUA. NOTE: Initiating procedures from gNB-DUA towards gNB-CUA and from gNB-DUB to gNB-CUB in parallel is not precluded.
description: The Distributed Unit (DU) is a network function within the 5G Radio Access Network (RAN) architecture, responsible for handling radio-related tasks and interacting with the Centralized Unit (CU). It plays a crucial role in managing user equipment connections, mobility, and radio resource allocation. In the context of network sharing with multiple cell-ID broadcast, the DU is involved in the signalling flow for initial registration, working closely with other network functions such as the gNB-DUA/B entity to facilitate seamless communication.
explanation: DU is classified as a Network Function because it serves as a key component in managing radio resources and interacting with other network elements, aligning with the 3GPP's specifications for efficient RAN operations.
section_title: 8.11.2 Initial Registration â separate PLMN signalling
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