3GPP Expert Skill for Claude

A comprehensive 3GPP telecommunications skill that turns Claude into a senior telecom consultant — covering everything from GSM (1992) through 6G (Release 21).

What It Does

This skill gives Claude deep, standards-grounded expertise across the full 3GPP ecosystem:

• All generations: 2G/GSM, 3G/UMTS, 4G/LTE, 5G NR, 5G-Advanced, 6G
• All releases: Phase 1 through Release 21, with detailed feature breakdowns
• Protocol stacks: PHY, MAC, RLC, PDCP, SDAP, RRC, NAS — with LTE vs NR differences
• Core network: EPC to 5GC/SBA evolution, all network functions (AMF, SMF, UPF, etc.)
• Deployment: Network planning, spectrum strategy, migration paths (NSA/SA options), O-RAN
• Security: Authentication (EPS-AKA, 5G-AKA), SUPI/SUCI, IMSI catcher analysis
• Practical consulting: Link budgets, cell planning, troubleshooting, interoperability

Example Questions It Handles

Deep protocol questions:

"Walk me through how a UE scans for and selects the best cell, from power-on to RRC Connected."

PHY layer precision:

"What sequence is used for PSS in 5G NR?" — correctly answers m-sequence (not Zadoff-Chu, which is a common AI hallucination)

Cross-generation comparisons:

"Explain the differences between LTE and 5G NR RRC state machines. What is RRC_INACTIVE?"

Security analysis:

"How does 5G's SUPI/SUCI mechanism protect against IMSI catchers? What vulnerabilities remain?"

Deployment planning:

"We're migrating from LTE/EPC to 5G on a budget. Walk me through the NSA vs SA options."

Installation

Claude Desktop (Cowork)

1. Download 3gpp-expert.skill from Releases
2. Open it — Claude will prompt you to install

Manual Install

Copy the 3gpp-expert/ folder (containing SKILL.md and references/) into your Claude skills directory:

~/.claude/skills/3gpp-expert/
├── SKILL.md
└── references/
    ├── releases.md
    ├── phy-layer.md
    └── working-groups.md

What's Inside

File	Purpose
SKILL.md	Main skill instructions — 7 knowledge domains, critical PHY facts, response patterns, when to web search
references/releases.md	Detailed release-by-release reference (Phase 1 → Rel-21) with spec series table
references/phy-layer.md	NEW — PHY layer deep-dive: synchronization signals per RAT (PSS/SSS sequences), physical channels, reference signals, RACH preambles, channel mapping
references/working-groups.md	NEW — Full RAN/SA/CT Working Group structure with owned specs and typical topics
3gpp-expert.skill	Pre-packaged installable file

Coverage

Releases

Era	Releases	Key Technologies
2G	Phase 1 – Rel-98	GSM, GPRS, EDGE
3G	Rel-99 – Rel-7	UMTS, WCDMA, HSPA, HSPA+
4G	Rel-8 – Rel-14	LTE, LTE-A, LTE-A Pro, NB-IoT, C-V2X
5G	Rel-15 – Rel-17	NR, 5GC/SBA, NTN, RedCap, Sidelink
5G-Adv	Rel-18 – Rel-19	AI/ML, XR, Ambient IoT, MIMO evolution
6G	Rel-20 – Rel-21	Sub-THz, ISAC, AI-native, digital twins

Specification Series

Covers TS 21–38 series with go-to specs for architecture (TS 23.501), NR radio (TS 38.xxx), NAS (TS 24.501), security (TS 33.501), and more.

Contributing

Contributions are welcome! If you spot an inaccuracy, want to add coverage for a specific topic, or have suggestions:

1. Open an issue describing the improvement
2. Fork the repo and submit a PR
3. Make sure any spec references are accurate and cite the correct TS/TR numbers

Support This Project

If you find this skill useful, consider supporting its development:

• GitHub Sponsors
• Star this repo to help others find it

License

MIT License — see LICENSE for details.

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Built by @lugasia