5G NR RLC ARQ Procedure
ARQ: Automatic Repeat Request In this procedure, RLC re-transmits RLC PDU or RLC PDU segment according to RLC status report. RLC sending…
5G NR RLC UM PDU and data transfer procedure
UM stands for “Unacknowledged Mode”. In UM mode, RLC adds protocol header to RLC SDU and if required SDU can be segmented. The…
5G NR RLC TM PDU and data transfer procedure
In TM mode, RLC does not perform any operations on the SDU and it is transmitted transparently. It will only buffer data on Tx side. No RLC…
5G NR RLC State variables, Constants and Timers
In this chapter we shall see the state variables that are used in UM and AM mode. SN = Sequence Number. All state variables related to AM data…
5G NR RLC entity handling Procedures and SDU discard procedure
In this chapter we shall see how an RLC entity is established, re-established and released. RLC entity establishment procedure When any upper…
5G NR RLC Layer Introduction
Images are taken from TS 38.322 RLC layer is located between PDCP (or RRC layer) and MAC Layer. It communicates with the PDCP layer (or RRC…
5G NR PDCP duplication and duplication Procedures
Below shows a schematic diagram of PDCP duplication: If PDCP duplication is not enabled, a PDCP packet will be transmitted to an RLC entity…
5G NR PDCP SDU discard and Status reporting
SDU discard For DRB, When the discardTimer expires for a PDCP SDU, or the successful delivery of a PDCP SDU is confirmed by PDCP status…
5G NR PDCP Layer Procedures state variables
In this section, we shall learn about Transmit and Receive operation along with related state variables. Constants and timers: Window_Size:…