name: LCG
full_form: Logical Channel Group
context: The Delay Status Reporting (DSR) procedure is used to provide the serving gNB with delay status of LCGs. This delay status for an LCG includes remaining time, which is the smallest remaining value of the PDCP discardTimers among SDUs buffered for the LCG as specified in clause 7.3 in TS 38.323 [4], and the total amount of delay-critical UL data for the LCG according to the data volume calculation procedure specified in clause 5.5 in TS 38.322 [3] and clause 5.6 in TS 38.323 [4] for the associated RLC and PDCP entities, respectively. RRC controls the DSR procedure by configuring the following parameter: - remainingTimeThreshold: the threshold on remaining time for triggering a DSR for an LCG. If an LCG is configured for delay status reporting, the MAC entity shall: 1> if the smallest remaining value of the PDCP discardTimers among all the data buffered for the LCG that has not been transmitted in any MAC PDU or reported as data volume in a DSR MAC CE becomes below remainingTimeThreshold
description: Logical Channel Group (LCG) is a network function responsible for managing and reporting delay status of logical channels within the 5G New Radio (NR) system. It provides the serving gNB with information on remaining time and total amount of delay-critical UL data for each LCG, enabling efficient control of data transmission and buffering.
explanation: LCG is classified as a Network Function based on its role in managing logical channels and providing delay status reports to the serving gNB, as described in the context from 3GPP TS 38.321.
section_title: 5.4.9Delay status reporting
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