The advanced engineer's guide to the entire NR signalling stack — SDAP, PDCP, RLC, MAC, RRC and NAS, then the interfaces that hold a disaggregated network together: NGAP, F1AP, E1AP and XnAP. Every layer traced message by message, IE by IE, timer by timer — grounded in 3GPP Release 19 and written for the three engineers who live in these protocols.
Every protocol is built from its one job upward: the PDU byte layout, the state machine, the procedures with their timers, and the exact IEs on the wire — then the part most books skip: how to test it, decode it in a live trace, and tune it. Every chapter ends with a summary and interview-grade review questions.
QoS-flow→DRB mapping (TS 37.324), then PDCP sequencing, ciphering, integrity, ROHC and reordering (38.323) — header layouts and the security maths.
TM/UM/AM, segmentation and the AM ARQ state machine (38.322); MAC multiplexing, HARQ, the MAC PDU and subheaders, RACH/BSR/PHR/DRX (38.321).
States, the ASN.1 message framework, connection setup/reconfig/re-establishment, system information, paging, measurements, mobility and AS security (38.331).
Registration and mobility, authentication, ciphering and integrity, and PDU-session management with QoS signalling — all of TS 24.501, decoded.
The interfaces that make a split, multi-vendor gNB work — and where most real integration bugs hide. Plus LTE 36.331/413/423 for EN-DC/NSA.
A whole part for engineers: conformance testing, reading PCAP/signalling traces, and the parameter-to-KPI map for tuning latency, throughput and signalling load.
Chapters 1–3 are completely free, no signup: the full protocol-stack map, the channel/bearer model, and the skill of reading 3GPP and ASN.1. Open the Kindle-style reader, switch between light, sepia and dark, and judge the depth before you spend $6.99.
Fixed chapter sidebar, three reading themes, font sizing, reading progress, and 120+ colour diagrams that re-theme with the page and colour-code every layer. Built for long, focused reading — on desktop and mobile.
Plus 5 appendices: an ASN.1 & PER primer, a per-protocol message reference catalog, a timers & constants reference, an IE cross-reference, and a full abbreviations + 3GPP spec map.
A one-time payment, instant online access, free updates. Read the free preview first to confirm the depth fits.
Yes — all of Part I (chapters 1 to 3) is completely free with no signup. Open the reader, try all three themes, and confirm the message-level depth before you buy.
To the bit. PDU and header byte layouts, ASN.1/IE structures, state machines, procedures with their exact timers, and the reject/ignore/notify criticality of interface IEs — grounded in 3GPP Release 19 (TS 37.324, 38.321/322/323/331, 24.501, 38.413/423/463/473, and 36.331/413/423 for LTE interworking).
Instant online access. After payment via Razorpay the full 27-chapter Kindle-style reader unlocks immediately in your browser — chapter sidebar, three themes, font sizing, progress tracking — with lifetime access. No subscription.
₹599 if you pay from India, $6.99 internationally. Pick your currency on the buy panel above. One-time payment, lifetime access and updates.
You should be comfortable with basic 5G architecture (gNB, AMF, UPF). Part I then builds the protocol foundations — stack, channels/bearers and how to read 3GPP/ASN.1 — so the layer chapters land. It is an advanced book, but it bootstraps you.
Because it's a digital product with instant access and a free 3-chapter preview, sales are final once unlocked. Please read the free preview first to confirm it fits your needs.
27 chapters, 120+ colour diagrams, a Kindle-style reader and lifetime access — message-accurate to 3GPP Rel-19, for less than a coffee.
Get the book — $6.99 / ₹599