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1. Introduction: Why RLC Still Matters in 5G NR When discussions around 5G performance arise, attention usually gravitates toward massive MIMO, beamforming, or spectrum efficiency. Yet, in real networks, user experience often degrades due to issues far removed from PHY or antennas. One of the most common root causes lies in the Radio Link Control (RLC)  layer. In 5G NR, RLC sits between PDCP and MAC, just like LTE. But assuming it is “unchanged from LTE” is a mistake. While t

1. Introduction Medium Access Control (MAC) scheduling is one of the most critical real-time functions in a 5G NR gNB. It directly determines throughput, latency, fairness, spectral efficiency, and QoS compliance. Unlike LTE, 5G MAC scheduling operates in a much more complex design space due to: Flexible numerology (multiple SCS) Mini-slots and slot aggregation Beam-based transmissions Massive MIMO QoS flows (5QI-driven scheduling) URLLC pre-emption and puncturing Dynamic TDD

3GPP Release 16 , finalized in  June 2020 , represents  5G Phase 2 , refining the foundation laid by Release 15. It broadens 5G NR capabilities beyond enhanced mobile broadband (eMBB), addressing  industrial automation ,  ultra-reliable low-latency communication (URLLC) ,  V2X ,  non-public networks (NPN) , and  integrated access and backhaul (IAB) . The RAN1–RAN5 workgroups each contributed critical enhancements, detailed below with their technical implications, implementati

Introduction to 5G QoS Framework Quality of Service (QoS) is a fundamental networking mechanism that is essential for both 5G and LTE...