Summary
Overview
Work History
Education
Skills
Certification
Additional Information
Timeline
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DENNIS DENZIL GEORGE

Chicago,IL

Summary

Efficient and experienced professional with proven knowledge for log analysis and debugging of 4G LTE and 5G NR protocol and workflow. Aiming to leverage my abilities to enhance my practical application related to my field of experience in 4G LTE and 5G NR testing as well as to have insight on how industry functions.

Overview

1
1
Certification

Work History

Modem System Validation Engineer

Google Inc.
9 2023 - Current
  • As a Modem System Test engineer under the product test team, worked on creating and executing test cases on the latest 4G/5G Samsung modem (Shannon) to evaluate its performance
  • Back-end log analysis for functional and KPI tests for various test cases including VoLTE and IMS
  • Extensive debugging of throughput related test cases performed on field specifically debugged DL/UL throughput performance issues on Physical layer (PDCCH, PDSCH, PUCCH, PUSCH)
  • Developing & conducting tests on various user debug Android builds on cellular devices to observe and report issues related to throughput degradation, signal reception, and modem power consumption
  • Worked on 5G mmWave and Sub6 teams to conduct live network testing, collecting and analyzing relevant logs on daily basis
  • Performed in analyzing logs mainly on physical layer (PDSCH, PDCCH, PBCH) to debug any issues on throughput degradation or loss of signal or out of service situation on live network (ATT, VZW, TMO, Fi)
  • Investigating the underlying reasons for issues like data stalls by analyzing logs and subsequently reporting the findings for further examination and resolution
  • Conducted voice call testing to assess potential issues such as call drops, missed calls, or redirection to voicemail and analyzing the root cause from logs and android bug report and to report the same to cross-funcrional team for further analysis
  • Performed handover test cases to check for handover from WiFi to cellular area for any slow throughput or out of service issues from the collected logs.
  • Executed RF shield box testing to simulate or create an out-of-service to full coverage area to check for latency and data stall issues from the collected logs to get root cause of the issue
  • Worked with cross-functional team such as RF development, System firmware for fixing the root cause of the issue
  • Demonstrated new product features and functionality to project stakeholders
  • Developed comprehensive validation master plans to ensure alignment across all projects and stakeholders
  • Experience in device testing and certification in the lab as well as in the field
  • Experienced working in Android devices extensively and iOS to an extent to collect logs and for its certification
  • Coming up with test strategy document to include all the test cases for the complete feature testing of the Android device testing and certification

Quality Assurance Test Engineer - II (5G NR)

JMA Wireless
3 2021 - 8 2023
  • As a test engineer - II for the Quality Assurance Team, have hands-on experience in Systems Engineering and Systems Performance Analysis
  • Exposure in using Prisma UeSIM for validating and assessing the LTE Baseband Unit (BBU) performance by creating different test scenarios such as increasing the number of UE in the cell (Cell Loading) and observing the number of UEs attaching to the network, TRX loss and cell bandwidth usage
  • Collaborated closely with development teams to identify, report and track issues resulting in no post-release defects
  • Developed and executed test plans, test cases, test cycles and test scripts using JIRA tracker to adhere to 3GPP standards for testing 4G LTE or 5G NR setups
  • Spearheaded end-to-end testing efforts for 4G LTE and 5G NR solutions driving quality assurance across (XRAN - product of JMA Wireless, Remote Radio Head)
  • Performed stability throughput testing on different eNB/gNB builds to monitor and report throughput degradation, cell load/stress failure
  • Testing the Baseband Unit under different channel frequencies in 4G LTE (20 MHz, 15 MHz, 10 MHz, etc.) and increasing the number of UE (upto 500 UEs) for channel capacity for the DL and UL channel and running these test scenarios on Prisma UeSIM for the BBU performance Observing TRX issues like transmission underflows and receiver overflows, number of successfully attached UEs in a cell
  • Performing various test scenarios such as bidirectional throughput testing, handover testing of various UE categories belonging to different 3GPP release version by interfacing the Prisma UeSIM with the RRH
  • Worked on the Quality of Service Class Identifier (QCI) on getting the data traffic flowing in the uplink and downlink direction using traffic flow template (TFT) in the UE (smartphone) by setting the Aggregate Maximum Bit Rate (AMBR) for default bearer and MBR and GBR for the dedicated bearers
  • Analysis of the logs from the BBU for LTE PHY/MAC/Protocol stack, TCP/IP messages for different test runs and applying debugging skills to check or report any failures
  • Testing the server consisting of the CU and DU for 5G NSA network using Viavi TM500 5G Network Tester (UE emulator) and interfacing it with the Remote Radio Head (RRH) to perform test scenarios such as handover, bidirectional throughput testing
  • Worked on setting up the 5G ENDC setup and testing the same using the Viavi TM500 Network Tester (UE emulator)
  • Worked on 5G NR feature testing for ENDC Link Adaptation by setting target BLER in gNodeB and validating the Link Adaptation Algorithm in gNB
  • Worked on feature testing for 4G LTE feature for preemption of low priority UEs in a cell and validating the BBU performance for preemption of UEs
  • Mentored junior team members, fostering a culture of innovation, knowledge-sharing and continuous improvement
  • Worked on converting manual test cases to automated test cases using LabVIEW software to run automated tests overnight
  • Experienced in extensive testing using network analyzer for RF measurements, oscilloscope, multimeter
  • Experience in working in device testing to certify the device performance using different carrier for LTE or 5G performance
  • Extensively using Android devices to test device and network performance and for its certification on network and device side
  • Worked on developing test cases and coming up with master test plan for feature testing for the network and for device testing by including various test cases under the master plans
  • Coming up with test strategy document to include all the test cases for the complete feature testing of the network as well as for device testing and certification
  • Using Python scripting for automation for log analysis

Modem System Test Engineer

Qualcomm Technologies Inc
3 2020 - 3 2021
  • As a member of the Modem System Test group responsible for executing tests on Qualcomm's latest devices/modem test platforms and software, air interface performance analysis and optimization
  • Working with 5Gmmwave and sub6 team to perform testing on live network Test, analyze and collect logs using Qualcomm Extensible Diagnostic Monitor (QXDM)
  • Verify key performance indicators (KPIs) and Voice/Data performance testing using Qualcomm's KPI-ATS
  • Utilize scripts (.BAT files) in Perl, Python for automated test executions
  • Perform Carrier Aggregation (2DL/UL CA,3DL CA) performance/functional testing
  • Execute mobility test cases for voice performance analysis, Inter and Intra-Cellular Handovers, RRC Connection and Circuit Switched Fallback Experience in using Rohde & Schwarz callboxes to verify UE connection onto various NR (Sub6 & mmWave), LTE, WCDMA, GSM bands and generating calibration files to allow UE to camp onto the network for testing
  • Perform Log Analysis & analyze PDSCH decode summary through filter command view (QXDM) or APEX
  • Performed modem tests for Apple device products (iOS smartphones) for its performance in the field on live networks and extensively debugging and triaging issues by finding the root cause using log analysis skills by QXDM software
  • Experienced in using QXDM for analyzing the logs collected for voice performance analysis, Inter and Intra-Cellular Handovers, RRC Connection and Circuit Switched Fallback to check for issues and debug issues in the collected logs during field/lab testing by collaborating with teams located in the US and overseas.
  • Working extensively on device certification for its performance and stability by collecting and analysing logs and reporting issues using JIRA
  • Worked on developing testcases and designing master plans and test scripts on JIRA by including various test case IDs into the masterplan
  • Worked mostly on Android device testing and MTP for the performance and certification
  • Developing test strategy document to include all the test cases for the complete feature testing of the network as well as for device testing and certification

Wireless Communication Test Engineer

Xilligence Pvt. Ltd.
8 2015 - 3 2017
  • Performed Data Processing for LTE KPI generation (RSRP, RSRQ, RSSI, SNR, MO/MT Call success rate, Call setup delay, Throughput, Latency, Handover, Reselections etc)
  • Participate in system and software troubleshooting, as well as reporting problems.
  • Assist senior engineers with eNB performance analysis.
  • Developed scripts in Python and C/C++ programming language to develop and convert manual test cases to automated test cases procedures

Education

Master of Science - Electrical Engineering

Texas A&M University - Kingsville
Kingsville, TX
12.2019

Bachelor Of Engineering - Electronics And Communication

Visvesvaraya Technological University
Belgaum, Karnataka, IN
07.2015

Skills

  • Systems Engineering
  • Quality Assurance
  • Debugging Skills
  • 3GPP Standards
  • Write Technical Reports
  • Test Preparation
  • Analyzing 4G or 5G UE or eNB/gNB logs
  • Defect tracking using JIRA tracker
  • Strong problem solving and troubleshooting abilities
  • JIRA
  • Confluence
  • Quality Assurance Procedures
  • Test Scripts and Diagnostics using JIRA
  • Jenkins Build
  • Train Employees
  • JIRA Test Plan Development
  • Quality Standards
  • 4G LTE and 5G NR Call Flow and Protocol Knowledge
  • Qualcomm Extensible Diagnostics Monitor (QXDM)
  • Prisma UeSIM
  • Viavi TM500 Network Tester
  • Remote Radio Head Testing
  • Platform Validation
  • eNodeB/gNodeB Performance Validation
  • Public Speaking and Presentations
  • Technical Communication Skills
  • Experience in both live network and simulated testing in lab on test gNBs
  • Skilled at test planning and execution of 4G/5G technologies
  • Expertise in protocol log analysis & triage of failures across cellular Modem and network ( eNB/gNB) platforms
  • Experience in several debugging tools such as QXDM, APEX, Wireshark, XCAL, Accuver etc
  • Experience in Android and iOS device testing for log collection, performance, stability and analysis of bugreports from the devices (Android/iOS)

Certification

  • Successfully completed certification program on Basic Python Programming conducted by Massachusetts Institute of Technology (MIT) from edx.org
  • Successfully completed certification program on SoC verification using Verilog online course in Udemy
  • Successfully completed training on VLSI circuit and layout design by industry experts
  • Successfully completed a certification program on “Leadership and Management”
  • Successfully completed a certification program on “Business English Certificate Preliminary” conducted by University of Cambridge

Additional Information

Authorized to work in the United States under the H1-B visa issued by the United States Citizenship and Immigration Services (USCIS) which gives the permit to work legally across United States

Timeline

Modem System Validation Engineer

Google Inc.
9 2023 - Current

Quality Assurance Test Engineer - II (5G NR)

JMA Wireless
3 2021 - 8 2023

Modem System Test Engineer

Qualcomm Technologies Inc
3 2020 - 3 2021

Wireless Communication Test Engineer

Xilligence Pvt. Ltd.
8 2015 - 3 2017

Master of Science - Electrical Engineering

Texas A&M University - Kingsville

Bachelor Of Engineering - Electronics And Communication

Visvesvaraya Technological University

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