Explore the inner workings of HARQ-ACK Codebooks in 5G NR! This in-depth tutorial covers how HARQ feedback is multiplexed across transport blocks, carriers, and code block groups.
Understand the differences between Semi-Static and Dynamic Codebooks, how the UE sends ACK/NACK to the gNB, and the role of DAI counters in reliable feedback delivery. 
What You’ll Learn in This Video:
00:00 - Introduction to HARQ Feedback Multiplexing
06:52 - Semi-Static HARQ Codebook
10:44 - Dynamic HARQ Codebook
13:46 - Real Traces: UE Capability Exchange and gNB Configuration
Topics Covered:
- HARQ Feedback Multiplexing (Multiple TBs, Carriers, CBGs)
- Semi-Static Codebook (Type 1): Fixed Size, Predictable Mapping
- Dynamic Codebook (Type 2): Adaptive Size, Efficient Use of Uplink
- Use of Configured DAI (cDAI) and Total DAI (tDAI)
- 5G NR traces and RRC signaling
References:
- 3GPP Specifications
- 5G NR in Bullets
- New Generation Wireless Access Technology Book
Perfect for: Telecom engineers, 5G RAN optimizers
Watch Video on YouTube 
https://www.youtube.com/watch?v=t1QdVmcFt9E
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