name: UL-DCCH
full_form: Uplink Dedicated Control Channel
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 Uplink Dedicated Control Channel (UL-DCCH) is a logical channel used for the transmission of control information from the User Equipment (UE) to the network. In the context of Initial Registration, it is utilized for sending RRC messages between the UE and the gNB-DU/B entity, which represents the radio resources of the shared cell in a network sharing scenario with multiple cell-ID broadcast.
explanation: UL-DCCH is classified as a Channel because it serves as a specific path for data transmission, focusing on control information exchange between the UE and the network during initial registration procedures. This aligns with the 3GPP's specifications for efficient communication in various network scenarios.
section_title: 8.11.2 Initial Registration â separate PLMN signalling
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