ANDY (KYUNG ILL) YOON

703-***-**** • ad2mxy@r.postjobfree.com • 25916 Stinger Dr, Chantilly VA 20152

Andy, a self-motivated wireless RAN engineer with a strong sense of ownership and accountability to provide a high degree of quality products, has more than 20 years of solid experience in wireless telecom industry. Possess knowledge and experience in a variety of integration testing, troubleshooting, KPI analysis, and deployment rollout throughout the lifecycle of product.

KNOWLEDGE

Telecom protocol and standard

o5G/4G TDD/FDD

oORAN

oGSM/CDMA/WiMAX

oTCP/IP protocol with Linux OS based servers

ENGINEERING EXPERIENCE

Samsung and Ericsson RAN (Radio Access Network) products.

eNB/gNB CU, DU and RRU

O-RAN products

FlexRAN (L1: intel, L2/L3: Radisys) + Foxconn RRU

UE DM products

Accuver XCAL, XCAP, and ARTS(Automatic Regression Testing Solution) and VIAVI TM 500

WORK EXPERIENCE

09/2022 – Present CI/CD Team RF Serv ice Engineer IV @Ericsson, Reston VA

I have been working to perform tests LTE and 5G SA/NSA in T-Mobile lab for Ericsson CI/CD (Continuous Integration Contiguous Deliver) project to validate software quality with regression and new feature cases (voice and data traffic, handover, link budget). In addition, I work for 4G/5G KPI monitoring, optimization, and troubleshooting issues from the T-Mobile’s field sites with analysing logs.

12/2021 – 02/2023 5G RAN Engineer @Deepsig, Arlington VA

The company Deepsig has been developing a 5G software based upon A.I(Artificial Intelligence) and M.L (Machine Learning). As the company proceeds development with focusing on UL quality enhancement based upon O-RAN structure (Intel Layer 1 + Radisys Layer 2/3 + Foxconn RRU), my role was to design 5G O-RAN network for the lab, operate end to end the overall systems, and troubleshoot in order to find improvement 5G PHY layer software under end-to-end 5G core to Physical layer. I measured and reported DL/UL throughput performance with details of RF factors like BLER, number of layers, and so on.

In addition, I also have experienced VIAVI TM 500 simulators during IOT test, where Deepsig was considering how to increase multi-UE capabilities for downlink and uplink on physical layer. The subject was how to interoperate ORAN functionalities and TM500 functionalities including physical and logical connections

01/2019 – 11/2021 Principal Engineer @Accuver, Reston VA

Accuver is a company which has been providing LTE/5G testing tools like XCAL/XCAP in telecom area and I was to end-to-end support the customer T-Mobile so as to operate an automatic testing tool in the lab for regression test

My job was to design and operate the automation testing tool in T-Mobile’s lab, to verify eNB/gNB vendor’s software and troubleshoot issues. For example, T-Mobile engineers requested me to operate the automatic tool when new 4G/5G eNB/gNB software loaded, I built up test cases (voice/data traffic performance, handover, link budget), scripts in the automation system regarding the customer required as well as operated the tool, found test results with analysis report including major KPI’s. Also, I was communicating with HQ engineers in South Korea to come up with software bugs and requirements from customer.

02/2001–12/2018 Principal Engineer, Director @Samsung Electronics, Korea

1.Wireless Telecommunication Principal Engineer (02/2016 – 12/2018)

Working as LTE project leader, I was managing maintenance projects for both JIO in India and Sprint PCS in U.S major service provider with below activities.

Monitor KPI trends in commercial sites (Coverage, Capacity, Availability, and other issue events on service issues). When faced issues, I was analyzing logs and coworking to build patches, and applied at commercial sites.

Project leader of Massive MIMO field trial for JIO in Mumbai India, 2017. I selected candidates out of commercial sites, replaced old RRH with M-MIMO unit, and prepare pre/post KPI trend.

Build up feature roadmaps (high level feature design) regarding requirements from customers.

Project Coordination of wireless telecom products based upon R&D process (Controls of delivery schedule, costs, headcounts for commercial project).

2.Deployment and Maintenance Senior Manager (03/2013 – 01/2016)

I was working as a Senior manager to support deployment and maintenance services of Sprint NV (Network Vision) project which was to replace 2G/3G RAN with LTE RAN DU/RRH. I was dispatched to Samsung local branch, VA and coworking with project managers and engineers on following activities. My report went to executive level of headquarter in Korea.

Monitor forecast and actuals of deployment steps, and analysis of issues

Make a MOP (Method of Procedure) and training field engineers to achieve a site acceptance

Professional service proposal based upon performance analysis in customer's commercial network

Analyzing headcount for engineering service and reporting to executives.

Risk management for vendor program, internal headcount, and supply-chain /logistics

Material planning and logistics based upon deployment schedule and procurement

3.S/W quality assurance Senor Test Engineer (03/2001 – 02/2013)

As a software assurance engineer for CDMA, WiMAX and TDD-LTE RAN system, I was responsible for test, function and qualify of RAN S/W Package in Lab and deliver to customer. Also troubleshooting issues in commercial sites with below activities

Discussion of feature description and priority regarding customer’s demand

Testing, troubleshooting, bug fixing for new features and regression in internal LAB

Single/Multi data call testing with simulators (MOS, E500, and other simulators) and DM tool

Test Plan/Case build, environment setup, testing/troubleshooting, and reporting a result.

Technical support to customer’s validation test in customer’s LAB with business trip

Support for S/W package application into commercial network with pre-checking, applying, post-audit

History of past customers is below

CDMA 1X and EVDO systems with SK Telecom (No.1 provider in South Korea) 2001 ~ 2005

M-WiMAX system with KT (No.2 provider in South Korea) 2005 ~ 2006

M-WiMAX system with Sprint PCS/CLEARWIRE in US 2006 ~ 2012

FDD/TD-LTE system with Sprint PCS/CLEARWIRE in US 2010 ~ 2013

EDUCATION

Korea University, BS in electrical engineering – 2001 Seoul, South Korea

CERTIFICATION

PMP (Project Management Professional) by PMI

Number: 1935908

Credential holder since: 14 Jun 2016

Credential valid through: 13 Jun 2022

OTHERS

BILINGUAL – ENGLISH (moderate proficient) and KOREAN (native)

SKILLED TOOL – LINUX, MS OFFICE, XCAL/XCAP, Spectrum analyzer, Wireshark, IPERF

MILITARY SERVICE in Korean Army – 1995 ~ 1997 (26 months)

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