Rajiv Sohini

(619)-592-3984

rajiv.sohini@gmail.com

Summary:

 

·          Around 7 years of experience in wireless telecom domain which includes mobile handset protocol testing, Interoperability testing and RF Performance monitoring and Optimization of cellular networks.

·          Extensively worked on CDMA, EVDO, UMTS and LTE technologies.

·          4 years of LTE Protocol Testing experience and currently working on Verizon Test Requirements

·          Experience with device certification testing, troubleshooting/analyzing problems, and supporting customers with product commercialization

·          Experience in debugging the issues from the logs throughout the whole range of layers Physical, MAC, RLC, PDCP, RRC and NAS to support the development team

·          Experience in AT&T 10776 & 16411 Testing and log analysis for call drops, call setup failures etc.

·          Qualcomm’s CDMA 2000 (IS-2000) air interface standard, CDMA 1x EvDO(IS 856), CDMA 1x RTT\EVDO, UMTS, LTE call processing and Layer 3 Message Analysis.

·          Experience in monitoring and optimization of network parameters(Handoff Failures, Lost Calls, Blocked Calls, Frequency related Issues) for the improvement of Key Performance indicators.

·          Experience in Cell Planning and Optimization with Planet-EV RF Planning Tool and Agilent Nitro, ACTIX, and TEMS Optimization tools .

·          Experience in planning, integration and optimization of new cell sites for both Coverage and Capacity(based on coverage plots and network parameters reports).

·          Experience in Interoperability Testing in Alcatel Lucent and Ericsson labs.

·          Good understanding of 3GPP specs for LTE

·          Familiar with the QNX architecture for the Blackberry 10 OS devices.

·          Superior communications skills with every area of organization, hardworking, self-motivated team player, and excellent interpersonal skills with command in communication.

·          Experience in Customer interaction and effective communication of issues and resolutions to the customers

·          Strong decision making and management skills.

·          Ability to work under extreme pressure with tight timeframes.

 

Tools Experience:

 

Debugging Tools : XCAL,QXDM, Wireshark, Comprion IT3 Prove, Agilent E6474A, ACTIX Analyzer

                               MapInfo & Samsung Proprietary tools

Test Equipment : Agilent 8960, R&S CMU500, Anritsu8480C, 8470, Spirent 8100-LTE.

Others                 : MS Word, MS PowerPoint, MS Excel, MS VISIO.

 

Professional Work Experience :

 

Blackberry, Irving, TX                                                                                                                       Jan’13 – Till Date

Inter-Operability Test Specialist

Responsibilities:

·          Perform Verizon specific internal lab IOT tests on the Network simulators and support the Network Vendor lab IOT activities for the Blackberry 10 handsets.

·          Troubleshoot and Analyze protocol logs, report issues and work with the design team to get them fixed.

·          Execute VZW carrier specific test suites on Network Simulators which include LTE Data Retry, IMS Registration and Retry, Multi-Mode Data Retry, LTE CDMA IRAT, CCF certification test plans etc on the Blackberry handsets 

·          Involved and lead the new IMS stack implementation testing and validation of the IMS related tests on the Blackberry devices, analyzing logs and uncovering issues from basic IMS Registration to all Verizon specific IMS related test cases.

·          Completed the Verizon specific tests for required carrier specific test milestones “Safe for Network”, Band 13 Cetecom Testing and VZW Lab Entry on BB10 devices, analyzed logs and reported underlying issues to the development team.

·          Analyze logs for the first level triage to pin point the issues .

 

Agile Global Solutions Inc, Bridgewater, NJ                                                                                                 Oct’10– Jan’13

Lead Engineer – IOT/Modem Protocol Test Team                                       Client : Samsung Telecommunications

Responsibilities:

·          Lead and coordinate the test activities here in NJ and report the LTE modem related issues to Headquarters

·          Successfully completed IOT(Inter-Operability Tests) which include LTE functional, Performance and IRAT test cases as per Verizon requirement for Samsung LTE devices in Ericsson and Alcatel- Lucent labs

·          Analyze TCP and UDP traffic using wireshark tool for debugging issues during Performance test cases.

·          Validation of the Samsung multimode(LTE/EVDO/CDMA) devices on various equipments such as Anritsu, Anite, Spirent and R&S CMW500 for certification of the devices.

·          Support the device certification testing which includes LTE Data Retry, IRAT, throughput tests, RF Performance & supplementary tests, UICC/USIM tests etc. in Verizon CPE lab in Bedminister, NJ. 

·          Collected and analyzed the logs in IOT tests using the Samsung internal tool and reported bugs and issues to head quarters

·          Involved in the certification process for LTE handsets, FIT and operation submission process

·          Debugging the issues from the logs throughout the whole range of layers Physical, MAC, RLC, PDCP, RRC and NAS to support the development team

·          Completed the AT&T 10776 SPE field test cases for Samsung AT&T Multimode (GSM/EDGE/UMTS/HSPA/LTE) devices and analyzed the logs for Call drops, MO/MT call setup failures

·          Supported the setting up of Human Kiosk prototype for CES 2011 in the Verizon Innovation lab, Waltham.

·          Interacting with customer for updates on test cases

 

 

 

 

 

ATEC Wireless, Bridgewater, NJ                                                                                                                Mar’10– Sep’10

LTE Handset Protocol Test Engineer                                                             Client : Samsung Telecommunications

Responsibilities:

·          Performed IOT activities on Samsung LTE devices

·          Flashing LTE devices with new releases of software

·          Conducted IOT(Inter-Operability Test) in network labs like Nokia, Ericsson and Alcatel-Lucent

·          Validation of the devices and scripts on various equipments like Anritsu,  Spirent and R&S CMU200

·          Collected  and analyzed the logs for messaging in IOT tests using the internal tool and reported bugs and issues to head quarters

·          Conducted various test cases for attach, detach and handover procedures for LTE devices as per the 3GPP specification

·          Involved in the certification process for UMTS/LTE handsets, Pre-FIT, FIT and operation submission process

·          Debugging the issues from the logs throughout the whole range of layers Physical, MAC, RLC, PDCP, RRC and NAS to support the development team

·          Interacting with client for updates on test cases

·          Supported the Network Infra-Vendors in field test for the pre-launch of LTE network of MetroPCS in Las Vegas

 

 

 

ATEC Wireless, Philadelphia, PA                                                                                                             Oct’09 – Dec’09

RF Engineer                                                                                                                                        Client : T-Mobile

Responsibilities:

·          Perform drive test  which involves collecting UE physical measurements for the  GSM and  

        WCDMA network using TEMS

·                                                    Post Process Cluster data in TEMS and Actix.

·           Developed clear understanding on UMTS layer 3 messaging, RRC functions, call flow process, UE call  

        states, Intra frequency measurements, Inter frequency measurements, Inter RAT measurements to analyze

       failure events.

·           Analyze layer 3 messages and verify each site and propose parameter changes on drive test data to improve    

        functionality and performance of the network.                                                                                                                                                     

·            Define and Tune Inter-Radio Access Technology (IRAT) 3G-2G Handover and vice versa, neighbor relation

         to improve accessibility and retain ability for voice, video and packet services.

·         Optimized 3G networks (rel-6) by using TEMS, MapInfo, Actix analyzer and Vendor specific tools

·           Monitored system parameters using TEMS Investigation/Agilent E6474A application and optimize them to

         meet required KPI’s with respect to CS and PS RAB`s

·          Verified and optimized the Neighbor list (Intra HO, Inter HO, Inter RAT) to improve the cell & site wise performance.

·          Collected UE physical measurements (SC, RSCP and Ec/No) for all the cells in active set & monitor set and scanner measurements (SC, RSCP Ec/No, and RSSI) for all the cells in the detected set.

 

 

Reliance Communications Limited, Hyderabad, India                                                                    Feb’05 – July’07

RF Engineer

Responsibilities:

·                          Conducted Drive Test and analyzed collected drive data for access attempt failure, handoff failure, call drops

       by analyzing     CDMA air interface messaging and monitoring parameters affecting Initialization, System

       determination, Handoff etc

·                           Analysis of Voice and Data Call Processing in Qualcomm’s CDMA 2000 Environment

·          Conducted PN Planning for the new upcoming cell sites.

·                           Analysis of Layer 3 Messages through Agilent E6474A tool.

·                           Post Processed the drive data for Pilot PN, ECIO, FER Rx Pwr, Tx Pwr, SINR , Fwd and Rvs throughput   

        Plots.

·          Analyzed and troubleshooted dropped calls, blocked calls and low throughput issues.

·                           Review Network Statistics(RAN, SPAT, UNL reports) to target areas for improvement by  analyzing lost  

        calls, handoff failures, frequency issues, origination failures, call blocking etc.

·                           Developing translations for new cell sites, cell site modifications, cell site re-homes, carrier additions, cell

        site upgrades or modifications as well as for new switching equipment.

·                           Update translation forms pertaining to RAN network that includes, neighbor list, inter frequency hand down

        neighbor list(FCI,CDHNL,CDHFL), BTS equipage, per sector information, power ratings of each sector,

        and carrier.

·                           Troubleshooting IFHO, ISHHO and Inter RNC Handoff Issues.

·                           Troubleshooting and resolving system problems that include, handoff failures, frequency related issues,

        intermodulation, poor originations/terminations, radio and network blocking, high CDMA FFER, poor Ec/Io,

        EVDO low data rate and data capacity.

·                           Generating Walsh Code Erlang reports to determine sector capacity, T1 Utilization reports for both 1X and

        EVDO network; managing resources to improve CE and carrier utilization.

·          Resolved Pilot Pollution and High Secondary Traffic issues by optimizing electrical, mechanical tilts and

Antenna azimuths.

·          Performed Pre and Post drive test for the voice and data network after antenna changes.

·          Performed Preventive Maintenance activities(Antenna Sweep test, VSWR and Power Calibration) on the sites.

·               Involved in planning and optimization of Outdoor Optical and RF Repeaters.

·               Analyzer, which is generated from other sources such as GSM operators, Cable TV operators and external noise sources.

·              Created and presented network performance reports to internal customers (i.e., marketing, sales)

 

Trainings attended:

 

·               Training attended on LTE and LTE Advanced basics  by Rohde & Schwarz, USA 

·               Trained by Reliance communications limited, Hyderabad, India on CDMA Basics and

      Network Optimization.

·               Trained by Agilent Technologies, Hyderabad, India on Agilent(GSM/CDMA 1x/EvDO) Drive Test and Optimization Tool.

·               Trained in Actix Analyzer and Automatic Cell Planning Network optimization process for 2g/3g radio networks

·        Trained by Qualcomm, San Diego, CA USA on RF Design, Network planning, Optimization, Radio, Interface protocol, physical layer, HSDPA performance and deployment for UMTS Network.

Education:

 

M.S (Master of Science) in Wireless Communications, National University, San Diego, CA, USA.

B.E. (Bachelor of Engineering) in Electronics and Communications Engineering from University of Pune, India.

 

 

References

Available upon request.

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