L3 Protocol Decoder Cheat Sheet
The field reference for decoding Layer 3 messages in 4G LTE and 5G NR. RRC, NAS, IMS/SIP, troubleshooting and ASN.1 in a single PDF document.
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What you will get
RRC Connection Setup/Reconfiguration, Measurement Report, Handover Command and more.
RRC Setup, RRC Reconfiguration, MeasurementReport NR, CellGroupConfig.
Attach, Detach, TAU, PDN Connectivity, PDU Session, Registration.
INVITE, 100 Trying, 180 Ringing, 200 OK, BYE and flow diagrams.
Decision trees for the most common failures: attach reject, handover failure, bearer drop.
Key ASN.1 syntax for reading 3GPP specs, with concrete decoding examples.
EMM cause codes, ESM cause codes, 5GMM cause codes with description and recommended action.
Free preview
- RRC Connection Setup (4G): Message structure, main IEs, common failure cases
- Attach Request / Accept flow: Complete NAS sequence with default bearer
- SIP INVITE (VoLTE): Key headers, SDP, codec negotiation
- 5G Registration Request: Differences from 4G Attach, new NR IEs
The full PDF contains 40+ pages of structured reference.
Who should buy this cheat sheet?
Quick field reference for diagnosing signaling issues.
Practical summary for revising 3GPP Layer 3 protocols.
Quick reference for network incident triage.
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