name: DRB
full_form: Data Radio Bearer
context: The procedure for changing the UE state from RRC-connected to RRC-inactive is shown in Figure 8.9.6.1-1. Figure 8.9.6.1-1: RRC Connected to RRC Inactive state transition. 1. The gNB-CU-CP sends BEARER CONTEXT SETUP REQUEST message with UE/PDU session/DRB level inactivity timer. 2. The gNB-CU-UP sends BEARER CONTEXT SETUP RESPONSE message. 3. The gNB-CU-UP sends BEARER CONTEXT INACTIVITY NOTIFICATION message with inactivity monitoring results. 4. The gNB-CU-CP determines that the UE should enter RRC-inactive (e.g., after receiving Bearer Context Inactivity Notification procedure). 5. The gNB-CU-CP sends BEARER CONTEXT MODIFICATION REQUEST message with a Bearer Context Status Change to the gNB-CU-UP, which indicates that the UE is entering RRC-inactive state. The gNB-CU-CP keeps the F1 UL TEIDs. 6. The gNB-CU-UP sends the BEARER CONTEXT MODIFICATION RESPONSE message including the PDCP UL and DL status that may be needed for e.g., data volume reporting. The gNB-CU-UP keeps the Bearer Context, the UE-associated logical E1-connection, the NG-U related resource (e.g., NG-U DL TEIDs) and the F1 UL TEIDs. 7. The gNB-CU-CP sends the UE CONTEXT RELEASE COMMAND message to the gNB-DU serving the UE, together with the RRCRelease message to be sent to the UE. NOTE: step 5 and step 7 can be performed at the same time. 8. The gNB-DU sends the RRCRelease message to the UE. 9. The gNB-DU sends the UE CONTEXT RELEASE COMPLETE message to the gNB-CU-CP.
description: A Data Radio Bearer (DRB) is a channel in the radio access network that carries user data between the User Equipment (UE) and the Next Generation Radio Access Network (NG-RAN). It is established, modified, and released as part of the bearer context management procedures. The DRB level inactivity timer plays a crucial role in determining when to transition from RRC-connected to RRC-inactive state.
explanation: DRB is classified as a Channel because it refers to a specific path for data transmission between the UE and the NG-RAN, which aligns with the concept of channels in telecommunications. The context provided highlights its role in bearer context management and state transitions.
section_title: 8.9.6.1 RRC Connected to RRC Inactive
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biotag_Description: O,B-Connection,I-Connection,I-Connection,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,I-Device,O,O,O,B-Network Function,I-Network Function,I-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Connection,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O