Field notes · 30+ articles · written by engineers

Read the field, not the hype.

30+ deep-dive articles on 5G NR physical layer, O-RAN architecture, AI/ML for networks, 6G, and RAN optimisation. Counters, KPIs, 3GPP references — no content mills, no SEO filler.

Showing all 46 articles · sorted by popularity
5G NR MobilityXn / N2

5G NR Handover — Xn / N2 call flow, events, failures & KPIs

A complete mobility deep dive: A3/A5 events, the Xn and N2 call flows step by step, NSA EN-DC SgNB mobility, conditional handover & DAPS — plus the too-late/too-early/ping-pong failure causes, counters, KPIs and a field optimization playbook.

41 min · TS 38.423Read →
5G NR PHYCalc

5G NR Throughput Calculation — PRB, MCS, MIMO layers, TDD & overhead

Where “up to 2.3 Gbps” comes from — and why your phone shows 400. The peak data-rate formula and the TBS calculation decoded term by term: bandwidth, PRBs, MCS, modulation, code rate, MIMO layers, TDD slot ratio, overhead and BLER, with worked peak and realistic examples.

38 min · TS 38.214Read →
5G NR PHYBeams

5G NR Beam Management — SSB, CSI-RS, beam failure recovery & optimization

How 5G aims its energy at one moving device: SSB and CSI-RS sweeping, the P1/P2/P3 procedures, L1-RSRP reporting, TCI/QCL beam indication, the BFD/BFR loop — and the field symptom every optimizer meets, great RSRP but terrible SINR, finally decoded.

40 min · TS 38.214Read →
VoNR / IMSRCA

VoNR Troubleshooting Guide — IMS registration, SIP errors, EPS fallback & RTP

A field root-cause guide: every VoNR call passes four gates — registration, IMS registration, call setup, media — and fails at exactly one. Find the gate, read the SIP code (403/408/486/488/5xx), check the 5QI 1 flow, and fix one-way audio fast.

39 min · TS 23.228Read →
5G NR PHYRACH

5G NR Random Access — PRACH, Msg1–Msg4 & 2-step RACH, fully decoded

The complete RACH deep dive: preamble physics & Zadoff–Chu, power ramping, the RA-RNTI maths, the 27-bit RAR grant, contention resolution and 2-step MsgA/MsgB — plus every failure point, the counters & KPIs that expose them, and a field optimization playbook.

42 min · TS 38.321Read →
VoLTE / VoNRPCAP

VoLTE & VoNR call flow — the complete PCAP-level deep dive

Every SIP, NAS, NGAP & Diameter message in IMS registration and voice setup, traced at PCAP level — plus a 10-minute field method for one-way audio, dead air, EPS Fallback and the calls that go wrong.

45 min · IMS voiceRead →
6GIntro

What is 6G? The 3GPP Release 20 study & the road to 2030

A clear, engineer-grade intro to 6G: how Release 20 starts the 6G study, the link to ITU IMT-2030, candidate tech and the realistic 2030 timeline.

12 min · 3GPPRead →
6GSpectrum

6G spectrum — FR3 (7–24 GHz) and sub-THz explained

Why the upper mid-band (FR3) is the headline 6G band, how sub-THz enables terabit links, the WRC decisions, and the propagation trade-offs.

12 min · 3GPPRead →
6GUse Cases

6G use cases & the ITU IMT-2030 framework

The six 6G usage scenarios — immersive, massive, hyper-reliable, ubiquitous, AI & communication, and integrated sensing — and the engineering behind each.

11 min · 3GPPRead →
6GSensing

Integrated Sensing & Communication (ISAC) in 6G

How 6G turns the network into a sensor: ISAC/JCAS, the Release 19 channel-model study, sensing modes, use cases and the hard engineering.

12 min · 3GPPRead →
6GAI / ML

The AI-native air interface in 6G

From 3GPP Release 18/19 AI/ML (CSI feedback, beam, positioning) to a 6G physical layer designed around machine learning, with life-cycle management.

12 min · 3GPPRead →
6GNTN

6G & Non-Terrestrial Networks — the satellite-native generation

How 6G makes satellites first-class: the 3GPP NTN journey, LEO/MEO/GEO trade-offs, Doppler and delay, and direct-to-device.

12 min · 3GPPRead →
6GMIMO

Cell-free & distributed massive MIMO for 6G

Why 6G may abandon the cell: many cooperating access points remove the cell edge and boost coverage and spectral efficiency.

11 min · 3GPPRead →
6GArchitecture

6G network architecture — beyond the 5G core

How 6G evolves the 5G Service-Based Architecture: AI-native and cloud-native core, RAN-core convergence, native NTN and sensing.

11 min · 3GPPRead →
6GRIS

Reconfigurable Intelligent Surfaces (RIS) for 6G

Programmable 'smart walls' that bend radio waves to fill coverage holes in 6G — how RIS works, vs repeaters/NCR, and the open challenges.

10 min · 3GPPRead →
6GRoadmap

6G standardisation timeline — 3GPP Rel-19/20/21 & IMT-2030

The full 6G roadmap: how ITU IMT-2030 and 3GPP Releases 19, 20 and 21 fit together, the milestones, and the realistic path to 2030.

11 min · 3GPPRead →
5G · USAUSA

5G in the USA — C-band, mmWave, FWA & the operator networks

How US 5G is built in 2026: the low/mid/high-band stack, the C-band rollout, the Fixed Wireless Access boom, and how T-Mobile, Verizon and AT&T differ.

11 min · regionalRead →
5G · EuropeEU

5G & Open RAN in Europe — spectrum, vendors & the O-RAN push

Europe's 5G map in 2026: the 700 MHz and 3.4–3.8 GHz pioneer bands, Ericsson and Nokia, Huawei swap-outs, the Open RAN drive, and Europe's energy-efficiency obsession.

12 min · regionalRead →
5G · Middle EastGCC

5G in the Middle East & GCC — the world's fastest 5G

Why the Gulf tops global 5G speed rankings: generous mid-band + mmWave spectrum, early Standalone cores, 5G-Advanced, and mega-projects like NEOM and the World Cup legacy.

11 min · regionalRead →
O-RANO-RAN

O-RAN architecture — a deep dive beyond the marketing slides

Full walk through the O-RAN Alliance architecture: RIC, xApps, rApps, E2, A1, O1, and how the CU/DU/RU split actually ships in live networks.

12 min · deep diveRead →
O-RANGuide

The complete O-RAN guide — what engineers actually need to know

Start-to-finish reference for engineers new to O-RAN. Architecture, interfaces, deployment patterns, and the real trade-offs vs traditional RAN.

14 min · primerRead →
O-RANvs RAN

O-RAN vs traditional RAN — where open wins, where it doesn't

Honest comparison: cost, performance, vendor lock-in, supply chain risk. When O-RAN wins, when proprietary RAN still dominates.

8 min · analysisRead →
O-RAN · DevxApps

xApps & rApps — the business logic layer of O-RAN

How to actually write xApps (Near-RT) and rApps (Non-RT), which policies make sense, and how operators are deploying them today.

10 min · devRead →
5G CoreCore

5G Core architecture — SBA, unpacked

How the service-based architecture replaces monolithic EPC. NF roles, API taxonomy, service discovery, and what it actually costs to operate.

11 min · 5G CoreRead →
5G CoreDeep

5G Core deep dive — every procedure, traced

Registration, PDU session, handover, paging, policy. Each procedure walked message-by-message with the actual HTTP/2 JSON bodies.

15 min · proceduresRead →
5G Core · SecuritySec

5G Core security architecture — SEPP, N32, roaming hygiene

How SEPPs actually protect inter-PLMN N32 traffic, what's encrypted vs what's exposed, and how to audit it end-to-end.

10 min · securityRead →
5G ↔ LTEvs 4G

5G vs 4G security — what actually changed under the hood

EPS-AKA vs 5G-AKA, SUPI/SUCI concealment, new trust assumptions, and why 5G closes old SS7/Diameter gaps.

9 min · securityRead →
Migration4G→5G

4G → 5G core migration — the field playbook

From EPC to 5GC without midnight outages. Coexistence patterns, NSA→SA cutover, regression traps, and staging strategies.

10 min · field notesRead →
Evolution4/5/6G

The 4G → 5G → 6G evolution — one timeline to rule them all

Every architectural inflection from LTE to the emerging 6G vision. What was dropped, what was bolted on, and what's next.

13 min · timelineRead →
AI · 5GAI

AI for 5G RAN optimisation — what actually works in production

Real ML use cases shipped by tier-1 operators: coverage, capacity, mobility. Data pipelines, feature stores, MLOps pragmatics.

12 min · AI opsRead →
AIHO

AI-driven handover optimisation — RL meets mobility

Reinforcement learning for handover triggers, A3/A5 thresholds and cell individual offsets. When RL beats static tables.

10 min · RLRead →
AIvs SON

AI vs SON — is the self-organising network finally here?

SON was the first automation wave. Here's where modern AI picks up, where SON still wins, and why operators need both.

8 min · opinionRead →
AIOpt

AI vs traditional RF optimisation — where each wins

Rules vs models: the cases where deterministic engineering still beats AI, and the cases where it doesn't stand a chance.

9 min · tradeoffsRead →
AI · LLMAgent

Agentic AI in telecom — the next operational layer

LLM-powered agents for network operations: from chat copilots to autonomous RCA. The patterns that work, the ones that over-promise.

11 min · agentsRead →
AI · Vision

AI in telecom, forever — adoption beyond the hype cycle

Why AI is a permanent fixture in operator workflows, not a fad. Which roles change, which disappear, which emerge.

9 min · essayRead →
MLModels

ML models for telecom — what to use when

Gradient boosting, neural nets, time-series transformers, graph models. When each shines on real operator data, ranked by fit.

12 min · modelsRead →
AI · FieldRLF

Predicting call drops with AI — RLF before it happens

Early-warning ML for radio link failure. Features that matter, data you'll need, the RCA loop that actually closes.

10 min · appliedRead →
AI · DataData

Real data sources for telecom AI — and how to stitch them

Counters, KPIs, logs, MDT, drive-tests, probes. Which source you actually need for which problem, and how to join them sanely.

11 min · data engRead →
AITop 10

Top 10 AI use cases in telecom — ranked by ROI

A practitioner's ranking: which AI projects actually pay back, which burn through quarters. With cost/benefit notes.

9 min · listRead →
AI · LLMPrompt

The "zero-document" master prompt for telecom LLM workflows

A single prompt pattern that works across RAN, core and IMS knowledge bases without per-domain fine-tuning. Tested on production.

8 min · promptingRead →
6G6G

The complete 6G guide — what's real, what's hype

6G candidate technologies assessed by maturity, feasibility and disruption potential. A field-engineer's view vs the whitepapers.

14 min · surveyRead →
6GCore

6G core architecture — the AI-native network stack

The emerging shape of a 6G core: AI-native control, intent-driven orchestration, unified compute-network fabric, zero-touch ops.

11 min · architectureRead →
6G · VisionHorizon

The 6G horizon — 2030 and beyond, for engineers

A grounded forecast of what 6G shipping actually looks like — timelines, spectrum, propagation, and the jobs that need doing.

10 min · forecastRead →
PHY · 6GProp

Propagation models for 5G & 6G — sub-THz, revisited

From 3GPP TR 38.901 to emerging sub-THz models. Which models hold at 300 GHz, where calibrated measurements matter most.

12 min · RFRead →
PHY · 3GPPCode

LDPC & Polar coding — 3GPP TS 38.212, unpacked

Why LDPC for data, Polar for control. Encoder/decoder intuition, complexity tradeoffs, and the real cost of iterations on silicon.

13 min · codingRead →
LTE ↔ NRMIB

LTE MIB vs NR MIB — every bit compared

Bit-by-bit comparison of LTE and NR Master Information Blocks. What got dropped, what got renamed, what new engineers need to know.

8 min · specRead →
VisionBeyond

Beyond speed — what networks are really optimising for

The KPI trap: we're still measuring peak throughput when the workload has moved to latency, consistency and predictability.

7 min · essayRead →
Vision · AISentient

The sentient network — a pragmatic definition

What "self-aware" actually means when you strip out the marketing. Concrete agent capabilities, operator maturity ladder.

8 min · essayRead →
Vision · ISACSensor

Network as a sensor — ISAC and why it matters

Integrated sensing & comms: when the radio fabric becomes the sensor network. Use cases, spec roadmap, privacy trade-offs.

9 min · ISACRead →
Vision · XRXR

The metaverse, from the network's side of the glass

Stripped of hype: the actual latency, throughput and mobility requirements XR/AR workloads put on 5G/6G, and what gaps remain.

8 min · XRRead →

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