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Engineer Software

Location:
Dallas, Texas, United States
Posted:
October 04, 2016

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Resume:

JYH-YUAN (STEVE) JEHNG

Dallas TX *****

469-***-****

acwwyj@r.postjobfree.com

SUMMARY

Special expertise in embedded software, telecommunication technologies and end-to-end solutions on 3GPP 3G/4G UE and Networks Call Processing Software Design, System Integration and Test.

Special expertise in protocol stacks, call processing and call flows, such as LTE, and WCDMA with the following features: IMS/VoLTE, eMBMS, CSFB, SRVCC, E911 call on VoIP, SON-ANR, and 4x2 MIMO with fading profile etc.

Significant strengths in depth debugging and developing test scripts by using Anritus RTD protocol analyzer, Monitor/Measurement tool, Qualcomm QXDM, Android Debug Bridge, System Trace Tool and WinDbg.

Experience in using C/C++ programming with Linux/Unix on real time embedded systems, i.e. LTE/WCDMA modem, Motorola two-way Radio Authentication feature, and U. S. Robotics Interworking Function Gateway and Remote Access System.

Known as highly motivated and a strong communicator who works well individually and as a team.

PROFESSIONAL EXPERIENCE

MICROSOFT LTD, Redmond, WA

Wireless Protocol Engineer, Wireless Development Group, Surface Dec 2014 to June 2016

Provide and validate solutions on the issues of Mobility Management, Mobile Network Selection, Carrier Aggregation, SMS, Mobile Hotspot, and SUPL/AGPS by utilizing System Trace Tool, WinDbg and Message Analyzer for Surface 3.

Debug many hard problems in the kernel including looking the crashes related to Intel 3G/4G Modem and Marvell WiFi.

Work on USB Composite driver and Windows Updates UMDF for Intel Modem.

Analyze MBIM Protocol among VAN UI, Modem and SIM card.

Create testing cases and automation utilizing Anritsu’s signaling tester call box platform MD8475A.

Develop trace logging and automation scripts using PowerShell/C#.

Integrate Broadcom GNSS with Intel Modem utilizing Spirent GPS simulator.

ANRITSU INC, Richardson, TX

Senior Staff Engineer, Wireless Protocol Systems Mar 2010 to Oct 2014

Design and develop 3GPP LTE/UMTS call processing and protocol stacks (Layer 1 and 2) test applications for MD8430A/MD8480C Signaling Tester.

Implement LTE test packages for commercial release, Qualcomm LTE specifications and other customers needs: Self-Organizing Networks and Automatic Neighbor Relation, CS Fallback, multi-RAT mobility (LTE/UMTS/GERAN/CDMA), 4x2 MIMO antenna systems with fading profiles, SMS, IMS(VoLTE), RCS (phone book), EMBMS, E911 call on IMS, AT&T LTE functional areas and fading profiles, Earthquake and Tsunami Warning System, LTE-A, and Data Performance.

Analyze carrier requirements/test plans and define its feasibility.

Perform prototype test case validation and work with device engineers for IODT at AT&T/VzW/T-Mobile lab.

Managed and coordinated R&D integration of test libraries with wireless carriers, chipset vendors, and mobile device manufacturers.

MOTOROLA INC, Schaumburg, IL

Senior Software Engineer, Private Radio Networks Engineering, Commercial, Government & Industrial Solution July 2009 to Jan 2010

Call processing C/C++ software design and development for Authentication feature on Motorola two-way Radio Astro Zone Controller Mobility, HLR, VLR and Interface to Authentication center.

FREESCALE SEMICONDUCTOR INC, Lake Zurich, IL

Principal Software Engineer, L1 Software, Cellular Products Group Jun 2006 to Jun 2009

3GPP WCDMA Feature Designer on Layer 1 (Physical) and Layer 2 (MAC/RLC/PDCP) for HSPA, Continuous Packet Connectivity, IMS and MBMS: completed Feature Requirements, Test Plans and replied to Customer Request for Information.

Design and implement Layer 1 Application Programming Interface for 2G/3G Modem software.

Develop test tool for UMTS/GSM L1-stand-along testing with antenna control.

Prototype LTE Layer 1 and Layer 2 Software: Cell Search, Power Control, RACH and Timing Advance, DL Link Adaptation and LTE inter-RAT Handover.

Patent being pursued: “Progressive Alert Notification for subsequent incoming calls from the same calling party.

MOTOROLA INC, Arlington Heights, IL

Principal Software Engineer, CDMA System Division Sep 1997 to Jun 2006

Software design and implementation for CDMA Radio Access Network Systems (BTS, SDU, and MM) on feature design, Call Processing Requirements, interface with O&M; also providing high level and algorithm design using C/C++.

Feature Specifics: EVRC-B (4th G. CDMA Narrowband/Wideband Vocoder), Satellite Backhaul, Boomer Cell, Mobile Idle Mode Hard Handoffs, 1X/EV-DO Hard Handoff Triggered by RF Round Trip Delay Measurement, Probe/Access Handoffs and Channel Assign into Soft Handoffs, Call Processing on Selection and Distribution Function, Call Processing on Packet Backhaul RAN and Packet BTS, Intra/Inter-CBSC Soft Handoffs During Call Setup, IS95/1X RF Power Control, CDMA Air/A1 Interface Design and 3GPP2 IS2000 Standards Contributions, Interface to Circuit/Packet Data IWU, Mobile Authentication processing and RAN RF Paging Channel Performance Simulation/Analysis.

Worked closely with project/program managers for providing impact statements, budget/schedule estimates, feature interactions, issues investigations and customer supports.

Senior Staff Software Engineer, Messaging, Information and Media Sector 1996 to 1997

Led engineers in designing and implementing 100C Wireless Modem Card (PCMCIA) for Cellular Digital Packet Data and AMPS using C and assembly:

Bootloader code downloaded via RS232 for reading/writing to the SRAM, Flash ROM and E^2 ROM of the Hardware MPU 68LC302.

XILINX Field Programmable Gate Arrays (FPGA) data download and operation.

Diagnostics software for the prototype hardware board via Orion 302 emulator.

RSA (third party) cellular modem (V42/ETC/ETC2) and AMPS software porting/integration.

U.S. ROBOTICS/3COM, SKOKIE, IL 1995 to 1996

Senior Software Engineer, Wireless/Telco Products Group, Network System Division

GSM and CDMA Data/Fax Interworking Function Platform:

- Developed the L1/L2 software of Gateway card for GSM/CDMA wireless call module, data coding translation, and end to end synchronization functions.

- Using C++ with Windows NT (as OS) to build driver.sys files and write INF file for loading drivers.

Wireless Access System at the cellular switch, receiving and routing incoming wireless calls from a cellular phone and cellular modem (V42/ETC/MNP10): Conducted system development: project definition, functional specifications, high-level design, C programming, unit testing, system integration, and beta testing.

T1/E1 Primary Rate ISDN Physical/Data Link layer programming and system integration (Passed European CEPT w/wo CRC, NET-5, 1TR6 and VN4 Certification at Detecon on Nov. 22, 1995):

- AT&T T7230 Framer, AT&T T7270 Time-Slot Interchanger (TSI), HDLC driver programming

- E1 PRI Network Interface Card and Network Application Card programming on Intel 386

Implemented the call processing software features on T1/T1PRI card.

EDUCATION

Ph.D. Physics, Northwestern University, Evanston, IL

M.S. Computer Science, Loyola University, Chicago, IL

B.A. Physics, National Taiwan University, Taipei, Taiwan, R.O.C.

CERTIFICATIONS

Mastering LTE Air Interface - Award Solutions 2010

Exploring WiMAX (802.16), Understanding the 802 Wireless Standards, 1X EV-DO, Voice over IP, TCP/IP, and Six Sigma - Motorola University.

CCNA training - Harper College, 2006



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