SHANTHALA THAMMAIAH

3G CORE/LTE System test Engineer

Mobile: (913) 617-7263

E mail ID: shanthala.kt@gmail.com

Linkedin profile:  http://www.linkedin.com/pub/shanthala-thammaiah/23/118/331 

 

Summary:

·   10+ years of experience in testing, development, integration and deployment experience in all phases of life cycle, including requirements gathering, risk analysis, project planning, design, coding, scheduling, testing, defect tracking, management, and reporting

·   Strong end-to-end technical knowledge in Mobility Applications, Mobility Platforms and Operating Systems,  IMS , CDMA , GSM , GPRS , UMTS , HSPA , LTE  and solid understanding of VoIP and Wireless Protocols (SS7, SIP, ISUP, MAP, IS41, IS826, DIAMETER, Megaco, Extended DNS, A1/A2-i/F, S1a, S6a, MGCP, H.323, RTP, GTP, GRE, Gx, Gy etc)

·   Expertise in testing various protocols for interoperability of CDMA core, LTE core systems and IMS system.

·   Hands on experience with Protocol Analyzer tools and debugging tools like Wireshark, Empirix, Techno, SIPp and Codenomicon etc.

·   Solid understanding of 3GPP/3GPP2 Standards

·   Experience in project management and managing with multiple projects.

·   Experience working remotely and cooperatively with HQ

·   Effective communication skills with ability to clearly explain ideas and influence decisions

·   Self-motivated and constantly looking for ways to improve both product and process

·   Exceptional organization, time management skills and multi-tasking skills

·   Ability to work efficiently and effectively in a fast-paced environment, under stress and within time constraints

 

Technical Skills:

 

Operating Systems	MS-DOS, WINDOWS, UNIX, LINUX
Languages Protocols Exposure / Standards	C, C++, ADA, SQL, TCL, TTCN3, (SS7, SIP, ISUP, MAP, IS41, IS826, DIAMETER, Megaco, Extended DNS, A1/A2-i/F, S1AP, S6AP, MGCP, H.323, RTP, GTP, GRE, Gx, Gy, CAP, INAP, IS771, VOIP
Databases	DB2, ORACLE, SQL SERVER
Testing Tools and Protocol analyzers	VSS, PVCS, GTR, 3GLT, SSPTool, Ideploy, Vectorcast, Itrace, OAM, Apache, Tomcat, Rational Robot, WinRunner, Purify plus, purecoverage,  Data station, PLSQL, Geoprobe, WireShark, SOA tool, Convergys tool, HP Quality Centre, DTS, SIPp tool and Empirix, Techno, Remedy, ALM, Codenomicon.
Application Testing	GUI, Functional, User Interface, API, Protocol Stack, SIB, Integration, Continuous Integration and Regression Testing, UAT, Non Functional Testing, MSC Switch Certification and IP MGW certification.

Professional Experience:

 

Samsung Telecommunication America                         January 2012 – till date

Location: Overland Park, Kansas

Designation: System Test Engineer

 

Working for Network Vision project as a SME. Involved in certifying the Samsung MSC, EPC and IPMGW with Sprint network elements for 3G, LTE and IMS platform. It involves supporting various protocols like MAP, IS826, ISUP, A-interface, IS-41, A-interface, SIP, MEGACO, RTP and extended-DNS, Diameter, S1a, S6a.

 

·   Tested flavors of Sprint services like Prepaid services, CALEA, e911, CMAS, LBS, CRBT, VMS, WPS, IVR, IVHHO, Billing.

·   Tested flavors of sprint network functionality like eCSFB, SIP IOT, DNS(CRF) routing functionality,  OAM and redundancy, Capacity and overload testing of Samsung MSC, EPC and IP MGW.

·   Supported SIP IOT with different vendors like Ericson, ALU, NGVN, Plexus and Sprint’s peering partners, Google’s IMS Waterpolo platform and other IMS carrier platform.

·   Tested interaction between different 3G/4G Sprint network elements like MSC, IPMGW, MME , IWS, SGW, PGW, HSS, TAS, SBC, PCRF, MPC, BSC, HLR, SMSC, CMAS, BSC, NPDB ENUM server and other vendor networking elements.

·   Provisioned the WSS and IPMGW in the sprint Innovation lab. Worked closely with Samsung network equipment manufacturer partners to develop method of procedures (MoPs) for equipment upgrades and reconfiguration. Maintain equipment for all network elements and test platforms

·   Assist the Manager and 3G core and LTE Network Lab with forecasting for testing needs in advance to ensure that the proper test equipment is in place. Train lab users on test equipment, procedures and lab capabilities.

·   Involved in Certifying the EMS for managing and monitoring Network elements.

·   Engineer, configure, operate and troubleshoot and provide RCA for issues with the 3G Core and LTE network lab

 

 

Leap Wireless Cricket CommunicationsAugust 2010 – January 2012

Location: Rolling Meadows, Illionis

Designation: System test Engineer

 

·   Successfully lead the Cricket SCP certification at the Sprint Campus for the Cricket and Sprint Partnership of MVNO and MVNE project.

·   Design, develop and implement integration testing and planning of Cricket communications prepaid and postpaid services utilizing Gx and Gy Diameter interface with Convergys PCRF for OCF and OFCS system and SS7 network

·   Utilizing the knowledge of RFC 3588, a diameter base protocol and RFC 4006, a diameter credit control application protocol(CCR, CCA, RAR and RAA) and in depth understanding of SCP architecture and CCCTI platform

·   Participate in end to end testing in real time network elements like NSC (SCP), HLR, VLR, IAM, IRB and the front end ESP applications which utilize the CCCTI to ensure the call rating for prepaid services like voice, data

·   Involved in IS826 certification with Sprint Lab for SCP.

·   Responsible for system integration testing which involved testing across the SS7 network elements like SCP, HLR, VLR and diameter client and server which in turn interface with the CCCTI to visualize the end rating of the billing system

·   Work with IP networks, systems integrations and testing including test strategy definition, requirement translation and mapping in order to test case, case procedural design and execution

·   Design, develop and implement issue resolution where needed with development team, system engineering team and third party vendors. Responsible for tracking and reporting all issues and their resolutions

·   Involved in the Operational Readiness testing (ORT) between the network elements like NSC, IAM and IRB designed to estimate recovery time of each network element. ORT Testing includes the testing of system break points, degraded network element scenario and loss of transport level messages like DWR, CER, ASR, etc., messages in real network which in turn triggers the OAM messages like Alarms, run logs, pagers, emails, calls to mobile number appropriately in the time based on priority of system degradation

·   Design and implement network congesting testing on the ISUP VIP and ANSI TCAP VIP by utilizing knowledge of SS7 network and protocols such as ANSI TCAP protocol and ISUP protocol, in order to bench mark the system capacity in handling the calls

·   Used SQL and database knowledge in writing the SQL queries using SQL developer tool to production and pre-production database to ensure the different toggling states of an accounts like provisioned, active, deficient, cancelled on different network element like HLR, VLR, NSC,PCRF

·   Verified IS 41 and SS7 messages

·   Involved in various lifecycle testing of PayGo AND PIA account using SOA tool and CVG tool

·   Involved in WEST IVR and IVR based call flow testing

·   Lead the effort of Performance and Stress testing with all End to End network elements.

·   Involved in Inter-operability testing between Cricket SCP and Sprint MSC’s and HLR.

·   Successfully lead the IS826 certification at Sprint Lab.

·   Involved in System Integration Testing of Prepaid and Postpaid billing System using Diameter protocol.

·   Involved in analyzing the billing and call related CDR’s in production environment.

·   Involved in UAT and E2E testing and Post deployment production support.

·   Worked on prepaid and postpaid billing migration project.

 

Huawei Technologies India Pvt Ltd April 2007 – April 2010

Location: Bangalore, India

Designation: Senior Software Engineer at R&D

·  In depth understanding of the Huawei IMS architecture.

·  Tested and lead the team for SCP Prepaid Charging services, Convergent Billing Service, Ring Back tone, Muliti Sim, VIrtual Private Network services for GSM and CDMA network.

·  Manage script creation for regression and stress testing and automated test cases using  TTCN3, SSPtool, GTR, Quality Center, etc. Used tools like Visual Source Safe, PVCS, Bugzilla for repository, reporting and tracking bugs, and providing updates on resolved bugs.

·  Tested Prepaid Charging Services for CDMA network and GSM network adhering to IS826 specifications that uses Wireless Intelligent Network capabilities  there by providing the VAS applications

·  Tested various telecom protocols like SS7, TCAP, MAP, SIP, Diameter, INAP, CAP, PARI, CS1+ and CDMA at stack and service level for SCP.

·  Tested SCP as DCC client and server for Diameter protocol for Pre-paid and postpaid services adhering to RFC 3588 and RFC 4006.

·  Tested CDMA protocol for PPC services.

·  Tested seamless roaming services for all CAP and MAP protocols in GSM network.

·  Tested Call Party Handling (CPH) and non-CPH operations of CAP4 Protocol for its protocol confirmation. Involved in real service testing of PPC call flows for all protocols. Also tested End to End testing including OAM, TRACE, Statistics and internal routing of the above protocols.

·  Tested Short Messaging Interface, Prepaid inter-operator Roaming support(using INAP CS-2/CAMEL/WIN standard interface)

·  Involved in migration of IN platform to NGIN platform

·  Analyzed business and system requirements and managed development of specifications to create and execute detailed test plans and verify bug fixes.

·  Configured test environment by creating frameworks, created test strategy for product development and derived the test schemes and test cases. Assure test data, schedule automated/manual tests. Approve results documentation and tracking systems updates.

·  Supervise development of SQL-queries/procedures for database and backend testing.     

·  Utilized CDMA diagnostic monitoring tools to support troubleshooting activities

·  Support test engineers with CDMA Pre-certification testing, providing technical guidance, debug and issue resolution as needed.

 

HCL Technologies India Pvt Ltd March 2006 – April 2007

Client: Hamilton Sundstrand, US 

Location: Bangalore, India

Designation: Senior Member Technical Staff

 

·   Involved in unit testing and written test stubs in C and C++ language

·   Involved in writing test scripts in ADA language, TCL and TTCN3 language.

·   Automated the test scripts using the Shell scripts and Perl scripts

·   Tested the CAN and various other protocols using the Protocol analyzers.

·   Written SQL queries and tested the Oracle Database.

·   Managed Source code using Visual Source Safe.

·   Involved in Change management using PVCS (Serena Change Dimension).

·   Involved in executing test cases using Vectorcast tool and RTRT(Rational test Real Time) tool and Rational Robot.

·   Tested the AMS application on UNIX platform

·   Ran automation scripts using WinRunner.

·   Involved in defect Tracking using HP Quality Centre.

·   Involved in the preparation of SWRD as well as SWDD reviews, Verification Test Plans (VTP) for Requirement based testing as per DO-178B guidelines across the complete lifecycle of software development - spanning specification, design, development, testing, verification & validation and sustenance.

·   Determined testing requirements developed and reviewed scripts for positive and negative test scenarios, conducted baseline testing, and generated reports.

·   Tested Boeing 787 and Airbus 320 for Hamilton Sundstrand, US

·   Involved in structural coverage by using Modified Condition/Decision Coverage(MCDC) as per DO-178B standard  as well  as code coverage testing by using  Vectorcast tool. 

·   Analyzed application, system, and security errors. Escalated issues to developers and verified fixes.

·   Designed test plans and defined cases for functional, integration system, and user acceptance testing(UAT).

·    

Aeronautical Development Agency, BangaloreJanuary 2005 – February2006

Location: Bangalore, India

Designation: Software Engineer

 

·   Involved in unit testing using RTRT and Vector cast tool

·   Did Code review using Understand C and C++

·   Involved in writing test scripts in ADA language, TCL and TTCN3 language.

·   Involved in the preparation of Software requirement documents as well as Software design documents, Verification Test Plans (VTP) for Requirement based testing as per DO-178B guidelines across the complete lifecycle of software development - spanning specification, design, development, testing, verification & validation and sustenance.

·   Analyzed the categories of requirements either functional or non-functional using C and ADA.

·   Monitored technical designs and technology management.

·   Coordinated with technical team in the implementation of Tejas On Board Flight Test Instrumentation

·   Firmware and Device Driver code analysis and inspection as well as testing done on various phases of software life cycle. SWDD AND SWRD reviews.

 

EDUCATION :

 

Bachelor of Engineering in Electronics & Communication from UVCE, Bangalore, India               (2000 – 2004)