Summary
Overview
Work History
Education
Skills
Timeline
Generic

MOHAMMAD IRSHAD

Bengaluru,KA

Summary

  • A highly skilled telecom professional with approximately 9.0 years of experience in LTE/5G system testing and log analysis. Proficient in LTE/NR protocol testing, modem system validation, IMS signaling, and RAN testing.
  • Extensive hands-on experience working with various IMS network nodes, including P-CSCF, I-CSCF, S-CSCF, AS, MGCF, among others. Proven ability to analyze and validate SIP, Diameter, and other protocol-level signaling for VoLTE and IMS services.
  • A quality-focused assurance engineer with expertise in L1/L2/L3 log analysis, modem validation, RAN testing, and LTE/NR feature implementation. Actively seeking challenging assignments in 5G Core, NR Protocol Testing, or IMS/VoLTE Engineering roles within a reputed organization in the Telecom or IT sector.
  • Experienced in field testing, protocol conformance testing, and end-to-end validation of mobile devices. Strong working knowledge of LTE, IMS, and 5G Core Network Architectures, including NFV/cloud platforms, EPC, CUPS, and 5GC Cloud-Native Functions (CNFs).
  • In-depth expertise in VoLTE and IMS protocols and interfaces such as SIP, Diameter, GTPv2, HTTP/HTTP2, and PFCP. Solid understanding of 3GPP LTE/NR protocol stack layers including NAS, RRC, PDCP, RLC, MAC, and PHY.
  • Hands-on experience with LTE signaling flows from UE power-on to Attach Accept. Strong domain knowledge of 5G NSA and SA architectures, with an understanding of interface evolution during NSA → SA transitions.
  • Proficient in LTE core and access interfaces such as LTE-Uu, X2-AP, S1-AP, S1-U, S1-MME, S11, S6a, SGs, Sv, S5/S8, and GTPv2.
  • Well-versed in 5G core interfaces like NGAP, Xn, N1, N2, N3, N4, N5, N6, and PFCP.
  • Knowledgeable in telecom protocols such as S1AP, NAS, Diameter, RADIUS, GTP-C, RANAP, SS7, etc.
    Skilled in end-to-end call flow analysis from UE to eNB/gNB.
  • Familiar with LTE/5G SON (Self-Organizing Network) functionalities.
  • Extensive experience in both manual and automation testing across RAN, QA, and modem devices in lab environments.
  • Proficient in analyzing modem logs (e.g., QXDM, Shannon) for identifying root causes of network and protocol-level failures.

Overview

10
10
years of professional experience

Work History

SR. TEST ENGINEER

Tech Mahindra Ltd.
03.2023 - Current
  • Analyzing SIP call flows (e.g., INVITE, REGISTER, BYE) for VoLTE, VoWiFi, VoNR, and IMS registration scenarios.
  • Diagnosing and identifying root causes of call drops, registration failures, and other signaling issues in CSFB, SRVCC, VoLTE, VoNR, and EPSFB calls.
  • Investigating modem-related issues such as connectivity loss, signal degradation, throughput drops, and RRC-level failures.
  • Performing end-to-end analysis of IMS call flows across all nodes to ensure compliance with 3GPP standards.
  • Evaluating voice quality metrics (e.g., MOS, jitter, packet loss) and providing suggestions for QoS optimization in VoLTE and VoNR.
  • Identifying signaling anomalies, latency issues, and protocol errors during IMS session establishment.
  • Troubleshooting customer-reported issues, replicating and resolving call failures and registration errors through log-based analysis.
  • Analyzing and verifying SIP, DIAMETER, and RTP messages for protocol compliance and interoperability.
  • Creating automation tools/scripts using Python for efficient log parsing, filtering, and correlation.
  • Collaborating with lab teams and QA engineers for issue replication, debugging, and end-to-end traceability.
  • Working closely with modem development and QA teams to validate performance against requirements and identify bottlenecks.
  • Demonstrating a strong understanding of IMS architecture, including nodes like P-CSCF, I-CSCF, S-CSCF, MRF, MGCF, and AS, with hands-on experience in end-to-end flows like IMS Registration, IMS-to-IMS calls, and VoLTE Roaming scenarios.
  • Staying updated with 3GPP releases, evolving IMS/VoLTE/5G features, and industry best practices for log analysis and testing methodologies.

TECHNICAL LEAD

AMANTYA Technologies Pvt. Ltd.
07.2022 - 02.2023
  • Responsible for Testing the Core Network Elements of LTE EPC or 5GC.
  • Performed test cases using Docker and Kubernetes environment as manual and automation testing, analyzing issues with post-processing tools such as Wireshark.
  • Worked on network features like Initial Registration, PDU session establishment, PDU session modification, N26 Idle & connected mode mobility, VoLTE, and VoNR EPSFB EPS Attach.
  • Investigate SIP signaling messages for registration, session setup, and teardown to identify bottlenecks or protocol mismatches.
  • Conducted Sanity, Regression, and Feature Testing as per client requirements.
  • Prepared/modified test scripts based on 3GPP Specification.
  • Analyzed 5G concepts of latency, capacity, network slicing, and virtualization.
  • Validated new IMS features like VoNR, Video over IMS, emergency call handling, etc.
  • Developed automation scripts for test execution and generating detailed reports on KPI metrics.
  • Tested 5G protocol stack NAS, PFCP, GTPv2, GTP, and network functions such as AMF, SMF, UPF, and other service-based nodes.

TESTING ENGINEER

Talent Pull and Infrastructure Pvt. Ltd.
05.2018 - 07.2022
  • Responsible for Modem chipsets & Mobile testing of Android Handsets.
  • Monitored issue tracking, error verification, and rejection/acceptance, and test execution.
  • Device Testing includes Functional Testing, Stress Testing and Stability Testing.
  • Involved in sanity, Functional, performance testing & Log Analysis.
  • Verified LTE modem features like cell selection/re-selection, LAU/TAU procedure, PLMN search, MO/MT CS call, PS calls, inter and intra handovers over CS/PS calls, SMS/MMS, CSFB functionality, SMS over SGs, SRVCC, VoLTE, CA, and supplementary services.
  • Testing & analysis of PLMN Selection, Cell selection, Cell re-selection, RACH procedure, HO procedure, Attach procedure and Throughput.
  • Throughput Testing, Measurement Reports Validation UE HARQ-ACK procedure, UE Reference Symbol (RS) procedure.
  • LTE Traffic Throughput Testing Using MIMO, SIMO, Open loop and Transmit Diversity eNodeB Setups.
  • LTE E2E Data Call Processing and Analyzing using MME,eNodeB,SGW,PGW,HSS and IMS Core.
  • IRAT Test Execution to Verify Inter-Radio Access Technology Transition Between GSM,3G and LTE.
  • Preparing Test Reports based on overnight testing results and raise bug reports against failures.
  • Verifying multiple LTE call flows of DUT (Attach, Detach, cell camping and handover).
  • Testing & analysis of PLMN Selection, Cell selection, Cell re-selection, RACH procedure, HO procedure, RRC establishment, Paging, UE power on and cell search criteria, attach authentication and other NAS/RRC functions.
  • UE logs analysis for 4G features CSFB, CA, MIMO, Handover using QXDM.
  • Flashing the new build using QFIL and Restore, the old build using QPST.
  • Analyzing the Impacts of Up-link/Down-link Bandwidth Changes during LTE Inter-band (Band 4 to Band 13) Handovers.
  • Validating modem functionality and performance under various conditions.

SR. TESTING ENGINEER

Telecom Network Solution Pvt. Ltd.
03.2017 - 05.2018
  • Optimized LTE networks ensuring seamless 4G-LTE coverage.
  • Ensuring Seamless 4G-LTE Coverage across the entire length of the cities as well as adjoining sub-urban, rural areas and Highways/Railways.
  • Analyzed drive test data and performed fine-tuning/optimization.
  • Analyze, Troubleshoot and resolve the worst cell problem to get the best KPIs improvement.
  • Carry out optimization techniques (proper antenna selection for optimal horizontal/vertical performance, mechanical/electrical tilting, appropriate transmit power setting, antenna clearance, neighbor list analysis, etc.) for the optimal site/cluster performance.
  • Collect and analyze customer requirements & Generating GIS Database.

DRIVE TESTING ENGINEER

Talent-pull and Infrastructure Pvt. Ltd.
11.2015 - 10.2016
  • Conducted SCFT, cluster drive test and IBS drive as customer directives.
  • Analyzed drive test logs and finalized changes.
  • Analyzed various parameters such as RSRP, RSRQ, SINR, RSCP, EC/IO, BLER, CQI, RX level, RX quality, throughput, call drop, and call setup failure testing.
  • Experience in Prototype Handset testing (Static/Mobility) of LTE/WCDMA/GSM RAN.

Education

B.Tech - Electronics and Communications Engineering

Nizam Institute of Engineering And Technology
03-2014

10+2(Intermediate of Science) -

B.S.E.B
Patna, Bihar
03-2010

10th -

B.S.E.B
Patna, Bihar
03-2008

Skills

  • Windows & Linux
  • MS Office, MS PowerPoint
  • Docker and Kubernetes
  • PYTHON, Robot Framework(basic)
  • ShannonDM, Riemann, Wire-shark, Tshark, Simpli, QXDM, QCAT, QPST, QFIL, AXIOM, CMW500, TM500, Genex Probe, Xcal and TEMS

Timeline

SR. TEST ENGINEER

Tech Mahindra Ltd.
03.2023 - Current

TECHNICAL LEAD

AMANTYA Technologies Pvt. Ltd.
07.2022 - 02.2023

TESTING ENGINEER

Talent Pull and Infrastructure Pvt. Ltd.
05.2018 - 07.2022

SR. TESTING ENGINEER

Telecom Network Solution Pvt. Ltd.
03.2017 - 05.2018

DRIVE TESTING ENGINEER

Talent-pull and Infrastructure Pvt. Ltd.
11.2015 - 10.2016

B.Tech - Electronics and Communications Engineering

Nizam Institute of Engineering And Technology

10+2(Intermediate of Science) -

B.S.E.B

10th -

B.S.E.B

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MOHAMMAD IRSHAD