Key Facts

Remote From:

Full time

Senior (5-10 years)

English

Hard Skills

Pcap Network Packet Protocol Analysis Decoding Shell Commands IPSec Tunnels Robot Framework Qt (Software) XCal (XML-Based Standards) Log Analysis +5 more

Other Skills

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Analytical Skills
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Detail Oriented
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Problem Solving

Roles & Responsibilities

Strong 3GPP protocol knowledge (TS 38.331 for RRC, TS 38.413/38.423 for NGAP/XnAP, TS 24.501 NAS) and understanding of IETF RFCs (IPsec/IKEv2, SCTP)
RAN feature expertise in ENDC (NSA) and SA Option 2 flows, mobility algorithms (Event A3/A4/A5), handover, and advanced features like CBRS, VoNR, EPS fallback, and PTP synchronization (1588v2)
Experience with end-to-end validation on real gNB and Femto Gateway hardware, protocol trace analysis (L2/L3), and RCA using tools like QXDM, Wireshark, QCAT
Automation and scripting experience in Python/Robot Framework for protocol flow automation and AI-assisted log analysis (PCAP parsing, log mining, failure signature summarization)

Requirements:

Standards-based validation: Execute end-to-end test plans on real gNB and Femto Gateway hardware, ensuring signaling complies with 3GPP specs; analyze L2/L3 traces to identify deviations during feature integration
Root cause analysis: Use QXDM, Wireshark, and QCAT to dissect logs at bit-level, debug issues such as throughput drops, S1/NG setup failures, and Security Gateway tunnel establishment
Automation and AI-assisted engineering: Develop Python/Robot Framework scripts to automate complex protocol flows, and leverage AI tools to parse PCAPs, generate log-mining regex, and summarize failure signatures from regression data
Network element configuration: Own lab setup including cOAM configuration, certificate management for SeGW, and Core Network (5GC/EPC) simulator tuning

Job description

Job Title: Senior 5G Network level Engineer (E2E RAN experience)

Location: Location: Bangalore (Hybrid)

Experience: 5-10years

Domain: 5G RAN / Small Cells / Protocol Stack

Role Summary

We are looking for a technically superior 5G Engineer who bridges the gap between standardization theory and practical network implementation. You will not just execute tests; you will validate the 5G Small Cell system against strict 3GPP Release 15/16/17 specifications and IETF RFCs. You will be responsible for E2E system testing on real network elements, using your deep knowledge of the protocol stack and AI-driven automation to debug complex Call Processing and Interoperability issues.

Core Technical Competencies (The "Must-Haves")

1. Good 3GPP & Protocol Knowledge:

Spec Literacy: Ability to read, interpret, and debug against specific 3GPP Technical Specifications, specifically:
- o TS 38.331 (RRC): Deep knowledge of SIBs, RRC Setup, Reconfiguration, and Measurement Reports.
- o TS 38.413 (NGAP) & TS 38.423 (XnAP): Handling Core Network signaling and Inter-gNB communications.
- o TS 24.501 (NAS): Understanding Registration, PDU Session Establishment, and Service Requests.
IETF RFCs: Understanding of Transport and Security protocols for SeGW integration, including IKEv2, IPsec (ESP/AH), and SCTP.

2. RAN Feature Expertise:

Complex Call Processing: Proven expertise in debugging the full lifecycle of ENDC (NSA) and SA Option 2 flows.
Mobility Algorithms: Technical understanding of Event A3/A4/A5 triggers, Handover Command/Complete flows, and failure scenarios (Radio Link Failure, HO ping-pong).
Advanced Features: Setup and debugging of CBRS (SAS/Domain Proxy interactions), VoNR, EPS Fallback, and PTP (1588v2) synchronization.

Key Responsibilities

Standards-Based Validation:
- o Execute E2E test plans on real gNB and Femto Gateway hardware, ensuring every signaling message complies with defined standards.
- o Analyze protocol traces (L2/L3) to identify deviations from 3GPP specs during feature integration.
Root Cause Analysis (RCA):
- o Use QXDM, Wireshark, and QCAT to dissect logs at the bit-level (ASN.1 decoding).
- o Debug intricate issues such as Throughput drops (RLC/MAC layer analysis), S1/NG setup failures, and Security Gateway tunnel establishment issues.
Automation & AI-Assisted Engineering:
- o Python/Robot Framework: Write scripts to automate complex protocol flows (not just UI automation).
- o AI Integration: Leverage AI tools (LLMs) to parse large PCAP files, generate regex for log mining, and summarize complex failure signatures from regression data.
Network Element Configuration:
- o Full ownership of Lab setup including cOAM configuration, Certificate Management for SeGW, and Core Network (5GC/EPC) simulator tuning.

Tools & Technologies

Protocol Analyzers: Wireshark (Advanced filters/Lua scripting), QXDM, QCAT, XCAL/XCAP.
Scripting: Python (Pandas for log analysis, Scapy for packet manipulation), Shell scripting.
Standards: 3GPP Rel 15/16, IETF RFCs (IPsec/Networking).