Julia (YAQIN) LIU

874 old checker Road, Buffalo Grove, IL 60089

Tel: (618) 641 3190 (cell)

E-mail: juliar_liu@hotmail.com

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Summary:

·               17+ years’ experience in product system analyst and testing/verification/validation of different telecommunication networks includes wire-line and wireless access and core networks from system end to end level.

·               Solid skills in analysis of network and performance measurements through use of protocol analyzers and systems.

·               Solid skills in Virtualization technologies including VMWare 5.5.0

·               Solid skills in computer system analysis of RF area include RF performance analysis.

·               Strong skills for testing mobile devices include CDMA and LTE smart phones, QC series of  Android devices includes both embedded mode and tethered mode.

·               Strong lab skills (e.g. software configurations, provisioning, MME/GW tracing and analysis) and hands-on experience. Knowledge of different software product including ENB, EPC, IMS, and OSS to support different services

·               Solid experience with network security extension of IP security functionality testing, application security and user security testing.

·               Develop, maintain and enhance quality plans for different products, lead the team in reviews of the processes and quality plans in specific area.

·               Work with product management and software Engineering in different project to ensure good system requirements and specification that can be implemented. Those system requirements include both technical and user interface requirements. Handle project issues such as system requirement changes, customer feedback and so forth.

·               Follow quality assurance and test methods as well as tools for planning, specification, documentation, and defect tracking. Also build schedule and lead teams toward successful completion of each releases for each project based on agreed to dates.

·               Solid experience with windows web browser, server, and SQL. Involved all the functional testing, stress testing, regression testing, robustness testing, fusion testing and integration testing etc.

·               Strong skills in wireless networks testing and analysis to ensure quality and reliability for different user equipment terminals. Worked closely with vendors to ensure the implementation of new features into IT network and wireless equipments;

·               Excellent troubleshooting  skills in root cause analysis, problem tracking and solving;

·               Solid skills in strategic project & release analysis including pre-study analysis, cost , feasibility analyses and risk control release by release by data analysis;

·               A proven track record in test objective planning, test plan and test case creations as well as requirements/design/test plan reviews;

·               Knowledge or experience of network layer protocols and technologies including TCP, UDP, IPv4/IPv6 etc. and 3GPP2/3GPP specifications for GSM, CDMA2000, WCDMA/UMTS, SS7, Qos, VOIP, VOLTE and LTE, also familiar with LAN/WAN, PICO and small cell;

·               Hands-on experience of network protocol tester/analyzers and test tool/environment including Win Runner, Spectrum, QPST, CAIT, QXDM, QCAT, LLDM, Wireshark, Aeroflex,Nethawk, SEEtool, LMTS, and C8 Fader etc;

·               Familiar with management tools including Mercury Quality center, Clear Quality, Rational Clear Quest, TM4LTE etc. ;

·               Good communication skills, excellent team work and quick learner.            

 

Working Experience:

 

11 / 2015 – now LTE/Subscriber data management Solution  level solution  Engineer Infinite consultant to Alcatel-Lucent   – 2000  Lucent Ln. Naperville, IL 60563, USA

 

·               Update test cases and SDM solution level test plan for SDM/AAA/SDME/COM based on Verizon requirements.

·               resizing lab for BE/FE/AAA to meet Verizon requirement of validation.

·               executed and verified full solution dual static ipv4/IPV6 compliance from SDM/SDME/AAA and COM by end to end testing.

·               validated the full upgrade path of MPI from n release to n+1 release includes pre-check, upgrade, soaking status check, commit, and post-upgrade checks.

·               verified the call modules works at QOS at 99.999% which includes 100ms WAN delay and all the LTE, GSM and CDMA calls.

·               created IMS/HSS/LTE Subscribers by using Jmeter and verify the call processing works

·               Provisioned SNMP and start SNMPMON for all the components which are not supervised ny the 1360 COM which includes AAA/SDM/SDME

·               Observing and analyzing system in order to access the measured performance to meets and exceeds the system requirements.

 

04 / 2013 – 10/2015      System Verification Engineer  Nokia Networks     – 1455 W. Shure dr. Arlington Height, IL 60004, USA

 

·               Creating various specialized software programs and applications that are used in logging test data and monitoring test progress.

·               Observing and analyzing system in order to access the measured performance to meets and exceeds the system requirements.

·               Executes test cases including scenarios for various handover such as inter-enb handover of s1 and x2, dedicated bearers includes network initiated and tracking area update.

·               Setup the call processing automation bench, monitoring the system and analyzing the system operational functionality and the lab test equipment to make sure the system is functional correctly.

·               Setup VMware virtual infrastructure for our automation benches for both enbpcs and sfejfws with VMWare5.5.0.

·               Installation of new software releases, system upgrades, installs patches, and regression testing the systems before FOA.

·               Expanding and modifying system to serve new purposes and improve work flow as per 3GPP specifications and NSN internal specific requirements.

·               Executing regression test cases from system end to end level for 3G to 4G handover, also involving setup the automation test environment from system level for TDD to FDD handover.

·               Participated network security extension of IP security functionalities testing of network element functional units, and strong understanding of LAN/WAN/WLAN.

·               Involved security scan and tested user security, software security for debugging information and data security.

·               Planning and integrated new features into each new releases to make sure the fully coverage of the system, and monitoring the system to find customer defects.

·               Setup IRAT between WCDMA/LTE also for SRVCC, trace and debug all the issues for VOLTE calls and handover issue between LTE and WCDMA.

·               Developing, documenting and revising system design procedures, test procedures and quality standards.

·               Participating customer issues reproduce in our lab system and analyzing issues by automation processes. Also it improves our existing computer system automation.

·               Engaging in system software verification and analysis for NSN’s 4G LTE EPC systems

·               Participating in manual test case creation, test cases update, and test cases system level execution.

·               Engaging in problem investigations and debugging techniques in alignment with customer techniques in the field, and assisting in resolving software and hardware defects that impact system functionality.

·               Isolating issues and categorizing the issues including test environment, system defect and test error and optimizing the test environment in order to enhance coverage.

·               Key contributors to find issues related to service rejects, authentication and ciphering failures, abnormal releases, delayed responses from various network nodes increasing call setup time as well as routing area/tracking are and paging failures etc.

 

11 / 2011 – 6/2012      Telecom software testing Engineer, Artech Information Systems LLC. - 240 Cedar Knolls Rd, Cedar Knolls, NJ 07927, USA

 

·               Monitor and analyze operational procedures, identify problems and learn specific input and output requirements.

·               Participate in reviews of requirements to clarify objectives during the design and development phases.

·               Write detailed description of user needs, function of different features and modify various applications.

·               Setup new software testing systems for 4G wireless systems, IP networks to enforcement of the end to end approach towards functional testing.

·               Identify and execute recurring tasks involving system level observation and analysis and to automate them.

·               GUI performance testing and analysis, debugging in LTE end to end system.

·               Executed ETWS features for all the customer required test scenarios by using SEETOOL, and analysis debug logs from QC UE, ENB modem logs and network wireshark tools.

·               Executed IRAT-ANR test cases by using both the simulator of LMTS and QC UEs.

·               Reproduced the customer issues include MRO issue, SC rebooting  issue etc.

·               Performed the regression testing, ATP test cases, and quite time test cases from end to end by using different UEs and Aeroflex.

·               Implemented and verified the Performance Measurements (PMs) for all the call processing related and session detail logs.

 

1 / 2010 – 10/2011   CDMA & LTE Integration & Verification Professional, Ericsson Canada - 3500 Carling Ave, Nepean, K2H 8E9, Canada

 

·               Family with the way of working process for RAN I&V to ensure the quality delivery of LTE different releases and verified different mobility devices works with our each releases.

·               Execute detailed test cases for over-the-air LTE network to validate LTE RAN features for 5 different mobility devices.

·               Perform IODT testing in over-the-air environment to validate quality of various mobility devices of different UE vendors including Android operating system.

·               Tested inter-band inter-frequency handover for key customers with 36 different scenarios. Performed ANR for different terminals.

·               Performed IRAT testing between LTE network and EVDO networks include blind IRAT and B2 event IRAT by using QC mobility device with tethered mode and embedded mode.

·               Validate eNB software and characterize system performance before eNB software delivery to customers.

·               Verified the key features such as maximum cell range, VOIP, DRX and PUCCH over dimensioning for layer one customers in NA to make sure different mobility devices works with our network.

·               Responsible for LTE various band regression testing. Contribute to TC updates, execution and defect retest as test prime.

·               Track issues and provide info, logs and traces to isolate, identify and resolve issues.

 

7 / 2000 -     12 / 2009      Product testing/verification Engineer, Nortel Networks Canada – 3500 Carling Ave, Nepean K2H 8E9 Canada

 

·               Responsible for CDMA 1xEVDO release testing and contributed to Test cases creations, PTP updates, weekly sanity testing and TC executions.

·               Led 1xEVDO critical feature testing, including connection duration OMs, BTS MgR Interactions, and ISSHO verification and interactions testing based on requirements and specification compliancy.

·               Led inter-revision handoff (Rev-0/Rev-A) and MEID feature enhancement including test plan creation and test case executions.

·               Led and worked with the 3^rd party for compatibility matrix including CDMA EVDO and CDMA 1xRTT inter-technology handoffs, contributed to TP/TC creation, execution and bug retests, release notes, activity cleanup, TC/TP updates and make this to ChR.

·               RCA participation in key issue resolutions through investigating and identifying root causes including issues for access terminal (QualComm serials) , RNC and PDSN.

·               Executed KPI/KCI performance testing for CDMA EVDO system.

·               Participated in the NTP document review throughout the test cycle to customer documentation accuracy and completeness to improve customer experience.

·               For EVDO post-Customer ready activities, participated in post-customer ready activities including addressing VO/Customer concerns, testing maintenance releases, PDSN and NBSS regressions at different versions.

 

·               Analyzed system requirements and wrote part of the functional specifications.

·               Responsible for patch_kit schedule.  Participated in drafting the test plan, building the patch_kit and reviewing test cases with GTS and designers.

·               Implemented SS7 protocol test in the MTP including ISUP, XTUP and IUP.

·               Implemented SS7 call setup traffic generating scripts for ISUP, XTUP with catapult DCPL language and spectra test tool.

·               Network regression testing using Tcl, catapult/spectra, network access simulator, and the device under test of CVX SS7 Gateway.

·               Troubleshooting and debugging, including new software verification and other testing;

·               Advanced internal technical support for emergency customer issues.

·               Built and tested software patch kits. Performed unit tests, functionality tests, robustness tests and regression tests;

 

11 /1994 – 06 / 2000  System verification/support Engineer, Nortel  Networks China  Beijing

 

·               Responsible for project implementation including communication, acceptance tests and offering on-site customer training after system delivery;

·               Networking test including SSN, BAN,OMC-R and RF;

·               Hardware and software upgrades, new features verification and robustness tests;

·               Supported final test of Main Station Control, Base Station Controller and Base Station Transceiver;

·               Performed CDMA system trial testing including commissioning, verification and network testing;

·               As First line support  MTX system verification, RF coverage test, database setup, software upgrade and troubleshooting.

·               Acted as on-site prime for DMS systems to coordinate with team members and engineering team for project implementation activities;

·               Troubleshooting using software tool to trace signaling flow, traps, software errors, and some mismatches;

·               Resolved signaling and call processing problems to coordinate communication between different switches;

·               Patched delivery and performed verification test to solve problems and applied new features, new office acceptance test, network test and final test.

·               Provided technical assistance to on-site field support engineers and customers.

·               Documentation prime for ISO9000 certification.

 

 

Education:

Formal Education:

·   XI’AN University of Post and Telecommunications, P.R.CHINA

September 3, 1990 – July 5, 1993

Majoring: Telecommunication Engineering

Equivalent degree of Bachelor of Engineering.

 

Certification:

·   ISTQB certification

 

Industrial Training

·   Catapult DCT2000 Training Courseby Catapult

·   Data communication trainingby Nortel

·   Principles of ITU-TS signaling system No 7by Nortel

·   GSM/FR trainingby Nortel

·   Compaq Unix TruCluster server trainingby Nortel

·   CDMA training by Nortel

·   Sun Solaris training by Nortel

·   EVDO trainingby Award solutions

·   QCHAT and QOSby Award solutions

·   VOIP and MMD for 1x/1Xevdo networksby Award solutions