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Session 1: 5G RAN Protocols Simplified: E2E Data Flow Breakdown

Mohamed ELAdawi

06 Jan 2025 — 1 min read

This video takes a deep dive into radio protocols, simulating the data flow between the UE and gNodeB while breaking down key timers and parameters such as t-Reordering and T-PollRetransmit . Additionally, we’ll explore the interplay between TCP/PDCP and RLC/MAC retransmission-related timers. This video covers the following topics:

Introduction
Radio Protocol Stacks: User Plane Overview
E2E DL Data Flow - User Plane
3GPP Configurable Timers & Parameters Overview
RLC Layer Content
RLC Layer - Transmission Modes Types
RLC Layer – Functions (High-Level)
AM RLC PDU Headers
RLC Without Segmentation Call Flow
RLC Segmentation Call Flow
RLC Re-Segmentation Call Flow
RLC ARQ Retransmission – Content
RLC - Transmission and Reception Windows
RLC Polling Feature
RLC ARQ (Retransmission)
How to Check RLC Timers and Parameters in DT Logs
T-Reassembly Timer Vs. HARQ Retransmission
T-PollRetransmit Timer Vs. HARQ Retransmission
RLC Layer (4G Vs. 5G Functions)
RLC Layer Variables

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