Engineering
Telecom Systems
at Scale
A telecom engineering knowledge base — from 5G Core and PS Core to packet analysis, Huawei networking, and real-world troubleshooting.
⚗️ Where Packets Become Intelligence
Areas of Expertise
Deep technical knowledge across every aspect of telecom engineering
PS Core & Huawei
Troubleshooting and managing Huawei equipment: USN, UGW, CG, UPCC, vUGW, vUSN, VCG. Data flow analysis, APN configuration, and session management.
Packet Analysis
Deep packet analysis with Wireshark and specialized tools. GTP, Diameter, PFCP, and other telecom signaling protocol analysis.
5G Core
SBA architecture, 5GC services: AMF, SMF, UPF, NRF, NSSF. UE registration flows, PDU Session, and EPC migration.
EPC & LTE
MME, SGW, PGW — signaling analysis for S11, S5/S8, S6a interfaces. Bearer troubleshooting, IMSI-based and IMSI-less attach procedures.
AI & Programming
Leveraging artificial intelligence in network engineering. Python programming, automation, and custom tool development.
3GPP Standards
Tracking 3GPP papers and specifications, staying current with 5th generation standards and network architecture evolution.
Latest Articles
View all →DNS and APN Resolution in EPC: The Lookup Behind Every Attach
Before the first bearer exists, the MME has to find a PGW — and it finds it with DNS. NAPTR, SRV and one zero-padded MNC decide whether an attach succeeds or dies with 'Missing or unknown APN'.
PFCP on N4: How the SMF Really Controls the UPF
The session is up in the SMF, but the UPF drops everything. PFCP is the only channel between them — and most outages are a missing or mismatched rule, not a protocol failure.
Gy Interface Deep Dive: The Complete Guide to Online Charging
Master the Gy online charging interface — DCCA protocol, SCUR/ECUR/IEC modes, CCR/CCA message flows, AVP definitions, quota management, and practical troubleshooting for PGW/UGW and OCS.