The 5G & 6G reference library,
984 micro lessons at your own pace.

Start your telecom journey with the fundamentals of wireless communication, radio frequency, and networking protocols. No prior telecom experience needed.

You cannot understand 5G without understanding what it evolved from. Master LTE architecture, air interface, key procedures, VoLTE, and see how every 4G concept maps directly to 5G.

This is where your core 5G journey begins. Understand the vision behind 5G, explore spectrum and bands, master the SA and NSA architectures, and learn the new identifier framework — SUPI, SUCI, S-NSSAI, and more.

Deep dive into the 5G NR radio layer — physical layer numerology, channels and signals, gNB architecture with CU/DU/RU splits, massive MIMO and beamforming, initial access procedures, and scheduling.

Deep dive into the 5G Core — Service-Based Architecture, all network functions (AMF, SMF, UPF, UDM, AUSF, PCF, NSSF, NEF, NWDAF), user plane architecture, PFCP, and the complete 5GC interface map.

Deep dive into 5G signaling procedures — Registration, PDU Session Management, Mobility & Handover, Paging & Service Request, De-registration, NAS error codes, and real-world troubleshooting with protocol log analysis.

Master the 5G QoS architecture — QoS flows, 5QI tables, GBR vs non-GBR, reflective QoS, PCF policy control, PCC rules, charging with CHF, and real-world policy design for services like video throttling and gaming.

Master 5G network slicing — S-NSSAI identifiers, NSSF slice selection, slice-specific NF instances, RAN/Core/Transport slicing, end-to-end orchestration, SLA monitoring, and real-world slice design for Industry 4.0 and healthcare.

Master 5G security — trust domains, SUPI/SUCI privacy, key hierarchy and derivation, 5G-AKA and EAP-AKA' authentication, NAS/AS security activation, slice isolation, SBA OAuth 2.0, SEPP roaming security, threat taxonomy, and lawful interception.

Deep-dive into Voice over New Radio — IMS architecture and SIP signaling, P-CSCF/I-CSCF/S-CSCF roles, IMS registration, VoNR mobile-originated and mobile-terminated call flows, QoS for voice (5QI=1), EPS Fallback, VoNR-to-VoLTE handover, video calling, and call-quality troubleshooting with MOS analysis.

Master telecom transport networks — IP/MPLS fundamentals and label switching, Segment Routing with SR-MPLS and SRv6, EVPN for mobile transport, fronthaul eCPRI and O-RAN 7.2x split, midhaul F1 interface, backhaul N2/N3 transport, PTP IEEE 1588v2 and SyncE timing, GNSS references, timing profiles G.8275.1 and G.8275.2, transport OAM with BFD and Y.1731, FlexE network slicing, and transport troubleshooting.

Master the O-RAN architecture and its transformative impact on 5G — O-RAN Alliance vision, disaggregated O-CU/O-DU/O-RU architecture, open fronthaul (7.2x split), near-RT and non-RT RAN Intelligent Controllers, xApps and rApps, SMO framework, O-RAN interfaces (A1, E2, O1, O2), multi-vendor interoperability, real-world deployments, and hands-on xApp design.

Master the complete RF planning and deployment lifecycle for 5G NR — propagation models (Okumura-Hata, COST-231, 3GPP 38.901), link budget calculations (DL/UL), coverage vs capacity dimensioning, antenna systems (passive panels, active AAU 32T/64T), MIMO configurations, mechanical/electrical/digital tilt, site design (macro, micro, small cell, indoor), hardware installation (AAU, BBU/DU, RRU), software commissioning, integration testing, site acceptance KPIs, 4G/5G co-existence, DSS, spectrum refarming, and NSA→SA migration strategies.

Master 5G drive testing and benchmarking end-to-end — drive test fundamentals (types, equipment, route planning), key measurements (SS-RSRP, SS-RSRQ, SS-SINR, CSI-RSRP, CQI, RI, throughput), industry tools (TEMS Investigation/Discovery, NEMO Outdoor/Handy, Accuver XCAL/XCAP, R&S QualiPoc, Actix Analyzer), post-processing and event analysis (handover, RLF, RACH failure, NAS reject), coverage/interference/throughput/mobility analysis, indoor walk testing, automated benchmarking, and professional report writing with actionable recommendations.

Master 5G network optimization and troubleshooting end-to-end — coverage and capacity optimization (tilt strategy, pilot pollution, load balancing), parameter optimization (handover, power control, RACH, MIMO, scheduling, TDD patterns), throughput and latency optimization (NR throughput calculation, CA/DC, 256QAM), systematic troubleshooting (registration failure, PDU session failure, call drops, RLF, HO failure, VoNR issues), and SON/automated optimization (ANR, MRO, MLB, MDT, AI/ML-driven optimization).

Master 5G protocol testing and log analysis end-to-end — protocol testing fundamentals (conformance vs interoperability, 3GPP TS 38.523, test methodology, protocol layers, UE categories), log analysis tools (QXDM, QCAT, Wireshark 5G dissectors, network-side analyzers, chipset vendor tools), NAS & RRC protocol analysis (registration traces, PDU session traces, RRC reconfiguration, handover traces, authentication traces, timer expiry troubleshooting), and test case design & automation (test methodology, test case writing for registration/PDU/HO, automation frameworks, defect reporting).

Learn 5G KPI frameworks and performance management end-to-end — KPI methodology (3GPP TS 28.552/28.554, counter-to-KPI mapping, PM data collection, reporting granularity), RAN KPIs (accessibility, retainability, mobility, integrity, availability, PRB utilization), Core KPIs (registration, PDU session, paging, NF-level metrics, E2E latency), and NOC operations (dashboard design, alarm management, escalation, automated alerting, NOC simulation).

Master indoor wireless coverage — indoor propagation and building penetration loss, passive and active DAS architecture, hybrid DAS design, multi-operator systems, indoor small cells, neutral host models, CBRS private networks, iBwave planning tools, RF survey techniques, WiFi-cellular coexistence, indoor 5G mmWave beam management, and real-world venue design for stadiums, airports, hospitals, and offices.

Learn private 5G and enterprise networking end-to-end — private network models (SNPN, PNI-NPN, hybrid, spectrum options, CBRS, regulatory frameworks, Wi-Fi comparison), enterprise use cases (manufacturing, mining, ports, healthcare, oil & gas, defense), private 5G architecture (on-premise/edge/hybrid deployment, small cell planning, lightweight 5GC, network slicing, SIM management, IT integration), and MEC & edge computing (ETSI MEC framework, 5G integration, local UPF breakout, campus deployment).

Comprehensive coverage of 5G-Advanced features — Rel-17/18 key features (NR-NTN, RedCap, MBS, AI/ML air interface, SBFD, energy savings), Rel-19 and beyond (Ambient IoT, NTN enhancements, XR optimization, eRedCap), and 5G-Advanced use cases (FWA, V2X, IoT landscape, positioning).

AI/ML in telecom networks (NWDAF, ML lifecycle, RAN/core/CEM optimization), network automation & ZSM (closed-loop, intent-based, ONAP, IaC, API-driven), and digital twins & predictive operations (predictive maintenance, capacity forecasting, AIOps).

Career-focused capstone projects for 8 telecom roles — RF/RAN Engineer, Protocol Test Engineer, Core Network Engineer, RAN Engineer, Network Optimization Engineer, Security Specialist, 5G Solutions Architect, and NOC/Operations Engineer. Each track includes role overview, key skills, tools, real parameters, capstone project, 30 interview questions, and certification guidance.

6G vision and requirements (IMT-2030, KPIs, use cases, global programs), 6G spectrum and enabling technologies (upper mid-band, THz, RIS, ISAC, cell-free MIMO, semantic communication, VLC), and 6G architecture (NTN, AI-native networks, compute convergence, quantum, sustainability).

Master cloud-native telecom — containers and Kubernetes for telecom, CNF design principles, Helm charts, service mesh, deploying 5GC on Kubernetes with DPDK/SR-IOV, auto-scaling NFs, CI/CD pipelines, GitOps, observability, and Day-2 operations for production 5G networks.

Master FWA and mmWave deployment — FWA architecture and CPE types, link budgets, capacity planning, QoS management, mmWave propagation and beam management, small cell design, dual connectivity, CPE installation, KPI monitoring, throughput optimization, interference management, and real-world troubleshooting.

Master satellite and NTN operations — LEO mega-constellations (Starlink, OneWeb, Kuiper, AST SpaceMobile), satellite architecture, orbit mechanics, inter-satellite links, direct-to-device, 3GPP NTN protocols, NTN link budgets, handover, Doppler management, KPIs, and commercial NTN deployments for maritime, aviation, and IoT.

Master O-RAN lab operations — near-RT RIC deployment on Kubernetes, xApp development with Python/Go SDKs, E2 service models, traffic steering and anomaly detection xApps, multi-vendor CU/DU/RU integration, open fronthaul testing, conformance certification, and real-world O-RAN deployments from Rakuten to Dish.

Master CAMARA/GSMA Open Gateway APIs, NEF exposure functions, and 5G monetization strategies including B2C, B2B, and B2B2X business models.

Master telecom digital twins for what-if simulation and predictive operations, AI-RAN techniques for beam management, CSI feedback, scheduling, and positioning, 3GPP AI/ML framework, TM Forum autonomous network levels, and closed-loop optimization with twin-validated AI.

Master cellular IoT for engineers building smart meters, asset trackers, agritech sensors, and connected industrial equipment. Compare NB-IoT, LTE-M, and RedCap deployment modes; understand 3GPP signaling for low-power devices; design coverage extension with repetitions and CE levels; analyze NTN-IoT for satellite connectivity over GEO/MEO/LEO constellations; and select the right technology for smart metering, asset tracking, agritech, and industrial monitoring use cases.

Engineer cellular IoT devices for real-world deployment. Master the modem ecosystem from Nordic, Quectel, u-blox, Sequans, and Telit; write and debug AT command sequences for attach, PSM, and eDRX; design for ten-year battery life with PSM, eDRX, and RAI optimization; secure devices with SIM, eSIM, iSIM identity, DTLS, OSCORE, and LWM2M device management; deliver firmware updates safely over the air; and navigate the GCF, PTCRB, FCC/CE/IC, and operator certification path that gets a cellular IoT product from prototype to global deployment.

For software engineers entering telecom — learn to build, contribute to, and operate 5G core Network Functions. Master the cloud-native architecture of 5GC where NFs are services talking HTTP/2 over the SBI, walk through real Open5GS and free5GC code paths for AMF, SMF, UPF, and NRF, implement an SBI server and client in Go using 3GPP OpenAPI specifications, design NF state machines for session establishment and registration, persist subscriber state with Redis or PostgreSQL, instrument with OpenTelemetry, containerize and deploy on Kubernetes, and ship your first contribution to an open-source NF project.

Engineer 5G core network functions for line-rate throughput and microsecond latency. Master profiling with perf and flamegraphs; understand where time goes in kernel networking; write user-space packet processors with DPDK; choose between DPDK, VPP, and AF_XDP; use eBPF for non-intrusive observability and XDP packet processing in the kernel; tune NUMA, CPU pinning, hugepages, and SR-IOV for production UPF; plan capacity at telecom scale. Pairs with Level 31 (NF Software Engineering) to complete the Telecom Software Engineer career path.

Enter telecom from the customer-facing technical side — pre-sales, solution engineering, customer engineering, and field technical roles. Master the operator buyer's journey from prospecting through closed-won; lead technical discovery calls that uncover real requirements; design solutions matching real telco operator needs across macro 5G, private 5G, FWA, and IoT; build demos that win deals; write RFP technical responses; price and position against incumbents; negotiate competitive deals; and hand off cleanly to delivery. This is the high-paying non-engineer path into telecom.

Operate the security of a live 5G core. Complements the architectural treatment in Level 8 with the operational view — what a SOC analyst actually does day-to-day defending a 5GC deployment. Master the 5G attack surface (SBI, signaling, NRF abuse, GTP-C tunnel hijacking), apply the MITRE FiGHT framework for telecom threats, engineer SIEM rules tuned for 5G traffic, hunt anomalies across NF logs and signaling traffic, run incident response playbooks for compromised NFs, and coordinate with NOC, legal, and regulators. This level completes the Cybersecurity Analyst career path alongside Level 8.