name: SRB0
full_form: Signaling Radio Bearer 0
context: The UE initiates the procedure when upper layers request establishment of an RRC connection while the UE is in RRC_IDLE and it has acquired essential system information, or for sidelink communication as specified in clause 5.3.3.1a. The UE shall ensure having valid and up to date essential system information as specified in clause 5.2.2.2 before initiating this procedure. Upon initiation of the procedure, the UE shall: 1> if the upper layers provide an Access Category and one or more Access Identities upon requesting establishment of an RRC connection: 2> perform the unified access control procedure as specified in 5.3.14 using the Access Category and Access Identities provided by upper layers; 3> if the access attempt is barred, the procedure ends; 1> if the upper layers provide NSAG information and one or more S-NSSAI(s) triggering the access attempt (TS 23.501[ System architecture for the 5G System (5GS) ]  [32] and TS 24.501[ Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3 ]  [23]): 2> apply the NSAG with highest NSAG priority among the NSAGs that are included in SIB1 (i.e., in FeatureCombination and/or in RA-PrioritizationSliceInfo), and that are associated with the S-NSSAI(s) triggering the access attempt, in the Random Access procedure (TS 38.321[ NR; Medium Access Control (MAC) protocol specification ]  [3], clause 5.1); NOTE: If there are multiple NSAGs with the same highest NAS-provided NSAG priority identified for access attempt as above, it is left to UE implementation to select the NSAG to be applied in the Random Access procedure. 1> if the UE is acting as L2 U2N Remote UE: 2> establish a SRAP entity as specified in TS 38.351[ NR; Sidelink Relay Adaptation Protocol (SRAP) Specification ]  [66], if no SRAP entity has been established; 2> apply the specified configuration of SL-RLC0 as specified in 9.1.1.4; 2> apply the SDAP configuration and PDCP configuration as specified in 9.1.1.2 for SRB0; 1> else: 2> apply the default L1 parameter values as specified in corresponding physical layer specifications except for the parameters for which values are provided in SIB1; 2> apply the default MAC Cell Group configuration as specified in 9.2.2; 2> apply the CCCH configuration as specified in 9.1.1.2; 2> apply the timeAlignmentTimerCommon included in SIB1; 1> start timer T300; 1> initiate transmission of the RRCSetupRequest message in accordance with 5.3.3.3;
description: Signaling Radio Bearer 0 (SRB0) is a specific channel used for transmitting control plane information, including RRC messages, between the UE and the gNB in a 5G network. It is configured with specific parameters as specified in the SDAP configuration and PDCP configuration.
explanation: SRB0 is classified as a Channel because it refers to a specific path for data transmission related to control plane information in the context of RRC connection establishment, which aligns with the definition of a channel in telecommunications.
section_title: 5.3.3.2 Initiation
biotag_Context: O,B-Device,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Message,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,I-Technology,O,O,O,O,B-Specification,O,O,O,O,O,B-Technology,I-Technology,O,O,O,O,O,O,O,O,B-Message,O,O,B-Message,O,O,O,O,O,O,O,O,B-Message,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Procedure,I-Procedure,O,O,O,O,B-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Message,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,B-Message,O,O,O,O,O,B-Procedure,I-Procedure,O,O,O,O,B-Device,O,O,O,B-Protocol,B-Interface,O,O,O,O,O,B-Protocol,O,O,O,O,B-Specification,O,O,B-Protocol,I-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,B-Protocol,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,B-Network Function,I-Network Function,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,O,O,O,O,O,O,O,O,O,O
biotag_Description: B-Connection,I-Connection,I-Connection,I-Connection,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,B-Device,O,O,B-Network Function,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,B-Protocol,O