Experience

Viettel Network Technologies Center - VTTEK

• Vietnam
• Telecommunications
• 1 - 100 Employee

• Quality Control

  • Apr 2017 - Present

  Work as quality control of eNB project in many phrase of testing cycle to control the quality of eNB software. - Acceptance test: represent at Vttek side to work with provider to verify the quality of eNB software. - System test: make test case, test script to simulate the real scenario where eNB is System Under Test with huge number of UE and activity like attach/dettach, HO, TAU, use traffic ... Analyse log and report to higher manager. - Feature test: for new feature implemented, base on design document and 3GPP make test case, test script, test enviroment to verify the feature, like VoLTE, TTI Bundling, QoS ... Show less



Aricent

• United States
• Software Development
• 700 & Above Employee

• Technical Lead

  • Jul 2016 - Dec 2016

  DSP Testing for Korean domestic customer.- Working with many kind of hardware (SKT enb, KT enb, RRH 800MHz, RRH 900MHz, RRH 1..8GHz … ) and LSM (LTE System Manager) to bring up the setup (grow/degrow enb ) with many customer (SKT, KT, LG ), board type (8000, 8200, 8400 ) and many configuration (2 cell, 4 cell … )- Code browsing for doxygen comment (what is the input, output, what does the function do )- Sanity testing when new patch was released with all domestic customer (SKT, KT, LG ).- Testing with 1 ue – real ue (s4, s6 edge +, note 4, lg phone) or multiple ue (maximum 1400 ue) with e500 for multiple traffic profile like UDP, FTP, VoLTE.- Root cause analyse base on DSP MAC, UL RLC, DL RLC, enb call control block, PDCP block.- Some issue involve: 2 band CA, 3 band CA, rar latency, drx, harq, dl scheduler, ul scheduler, throughput issue … Show less

• Senior Software Engineer

  • Dec 2014 - Jun 2016

  eNodeB System Testing - Executing test case with eNB Framework for various scenario and feature like: attach, detach, X2 HO, S1 HO, measurement Gap, DRX, SPS, Cell Start Stop, SON, HARQ, Reestablishment …- Troubleshoot in bring up new release of eNB with simulator and EPC.- Modify test plan for suitable with new eNB release.- Root cause analyse and report issue for development team.

• Senior Software Engineer

  • Jul 2014 - Nov 2014

  Aricent EPC Lite testing- Bring up Aricent EPC Lite with STATE- Test case execution to test function of each component EPC: like MME, HSS, PGW, SGW, PCRF for various scenario like: TAU, Attach, Detach, HO, pumping data …

• Senior Software Engineer

  • Sep 2013 - Jun 2014

  C Unit testing for eNodeB Framework- Writing test case for eNB framework at L2 and L3 (MAC, RLC, PDCP,RRC).- Debugging and fixing memory leak C Unit testing.

• Software Engineer

  • Apr 2013 - Aug 2013

  Macro eNodeB System Testing for Tier-1 Telecom Vendor (Hitachi)- Join the training and rampup for eNB System testing for Tier- 1 Telecom Vendor (Hitachi).- Test case execution for Hitachi test plan but with LTE IPR and PHY simulator.- Bring up eNB setup with MME simulator and Aricent EPC Lite

• Software Engineer

  • Mar 2011 - Mar 2013

  GEMU GSMR development- Take main role in development and maintain GEMU (GSM/GPRS Emulator) GSMR - Involved in analyse and debugging complex issues related to functional scenarios of BTS and BSC side.- Working along with BTS, BSC. MSC side at A interface, Abis interface.- Support GEMU with many kind of BTS and BSC.- Working along with I&V team to test BSC.- Have deep knowledge about GSMR protocol stack and scenario like VGCS/VBS call, HO, talker change 1/1.5 …- Take a lead to assign task and manage a small team with 2, 3 member. Show less