Engineer Test
Resume:
SAI KRISHNA
Contact Information: mail:***************@*****.***;
Professional Summary:
Total 3+ years of experience as LTE Protocol Test Engineer.
Extensive work experience on validation of L2 and L3 layers of LTE System.
Good Experience in analysing logs, debugging & isolating issues.
Well versed in performing Functional testing of wireless systems with sound knowledge of telecommunication protocols.
Looking for an opportunity to work as LTE Protocol tester with a view to upgrade my skills and professional experience in a renowned organization. Technical Skills:
Technologies Known : LTE,VOLTE, CSFB, MIMO
Technology worked on : LTE only
Protocols known : MAC, RLC, PDCP, RRC, NAS, X2AP, S1AP, GTP, DIAMETER Protocols worked on : MAC, RLC,& RRC
Scripting languages : TTCN3 & Python
Simulating tools : Elvior Test cast, Anite 9000
Packet sniffing tools : Wireshark
Platform : Windows
Professional Strengths:
Good understanding of LTE call flow Attach/Detach procedure, TAU procedure, Handovers, Network Registration process and Creation, Modification and Deletion of EPS bearers.
Good understanding of Physical Layer, L2, L3 protocols and Core protocols (GTP(GTP- C & GTP-U), X2AP, S1AP, Diameter) of LTE.
Knowledge of Information Elements present in RRC & NAS messages.
Knowledge on CSFB Call Flow.
Strong fundamental concepts of LTE/SAE Network Architecture and all the Interfaces.
Good understanding of Application level routing Protocols like Diameter.
Sound Knowledge on Functions of ENB, MME, SGW, PGW, HSS, PCRF & EIR.
Knowledge on analyzing and Identifying bugs from the logs of Wireshark.
Knowledge on AT Commands
Strong knowledge on Logical, Transport and Physical channels and their mapping.
Knowledge on EMM and ESM procedures in NAS layer.
Knowledge on Tunneling Mechanism between Network Elements.
Good understanding of MIMO
Good understating of LTE Network Architecture (E-UTRAN (ENB) and EPC (MME, SGW, PGW)) and each Component functions
Professional Experience:
I am working as a software test engineer at CURRIAN SOFTWARE SERVICES PVT LTD from july 2016 to till date in Hyderabad, Telangana.
Projects Summary:
PROJECT-1 : MAC, RLC UE Conformance Testing
Designation : LTE Test Engineer
Tools : Anite, Wireshark
Scripting language : TTCN-3
Protocols : MAC,
Duration : NOV 2017 to till date
Project Summary:
Detailed analysis conformance testing of MAC, RLC Layer features in mobile handset according to the Test specification 36.523 provided by 3GPP.
The Medium Access Control (MAC) layer of the radio interface protocol stack is specified within 3GPP TS 36.321
The Radio Link Control (RLC) layer of the radio interface protocol stack is specified within 3GPP TS 36.322
The MAC protocol is used to transfer both control plane signalling and user plane data.
The features I have tested
o Include Prioritization of logical channels,
o Random access Procedure/Successful,
o Random access procedure / MAC PDU containing multiple RARs. MAC bakeoff indicator
o MAC contention resolution / Temporary C-RNTI, MAC PDU header handling o Logical channel prioritization handling Correct handling of MAC control information / Buffer status / UL data arrive in the UE Tx buffer and retransmission of BSR / Regular BSR
o UE power headroom reporting / Periodic reporting o DRX Operation / Short cycle not configured / DRX command MAC control element reception
UnAcknowledgement Mode:
o UM RLC / Segmentation and reassembly / 5-bit SN and 10-bit SN / Framing info field
o UM RLC / Reassembly / 5-bit SN and 10-bit SN / LI value > PDU size o UM RLC / 5-bit SN and 10-bit SN / Correct use of sequence numbering o UM RLC / Reassembly / 5-bit SN and 10-bit SN / LI value > PDU size o UM RLC / Concatenation, segmentation and reassemble Acknowledgement Mode:
o AM RLC / Concatenation and reassembly
o AM RLC / Segmentation and reassembly / No PDU segmentation o AM RLC / Segmentation and reassembly / Framing info field o AM RLC / Segmentation and reassembly / Different numbers of length o AM RLC / Reassembly / LI value > PDU size
o AM RLC / Correct use of sequence numbering
Test cases of MAC are executed using ANITE conformance Tool
Log files are checked for bug reporting.
Responsibilities:
Understanding and analyzing each test case before actual testing starts.
Understand the 3GPP specification documents for the protocol MAC.
Analyzing of test case scripts and also trying to identify related test scenarios other than the identified scenarios which might improve the prospects of finding more bugs.
To provide detail reports on daily basis with bugs and initial analysis for problems. Providing the logs to corresponding Development Team with the cause of failure
Putting the actual failures in the error tracking system with detail analysis reports, cause of failure, and the real time logs are attached. PROJECT-2 : RRC (LAYER-3) UE Conformance Testing
Designation :LTE Test Engineer
Tools : Anite
Scripting language : TTCN-3
Duration : JULY 2016 to NOV 2017
Project Summary:
The project involved in the UE conformance testing before the product moves to the next level testing.
The aim of the project is to validate the RRC features in the mobile handsets against the protocol specifications provided by 3GPP 36.331
This project includes Conformance Testing of RRC protocols by using Conformance Tool set and involves Execution of test cases from 3GPP specification 36.523 using ANITE Tool.
The features I have tested
RRC connection establishment,
RRC connection re-establishment,
RRC connection reconfiguration
RRC connection Handover / Success / Inter-frequency
Verification of Idle mode and connected mode tasks of the UE.
Testing of RRC Layer using ANITE Tool with GCF approved test cases. Test cases are executed on Device under Test (DUT) using Anite Conformance tool. Log files are checked for bug reporting.
Responsibilities:
Understand the test cases as per 3GPP UE Protocol conformance specification 3GPP Release 9 RRC Specification TS 36.331.
Understanding the requirements for LTE test scenarios to be executed on Anite, TTCN3 Tools.
Modification of test scripts using TTCN3.
Creation and automation of test suites for Conformance testing.
Analysis of test logs to pin point issues.
Execution of test cases and raising the bugs, Log Analysis and reporting Preparation of test plans for the above activities based on 3GPP specifications. Bug Tracking and test case management using Quality Centre.
Professional Attitude:
Able to work effectively under pressure in order to meet deadlines.
Willing to walk extra mile to achieve excellence.
Hardworking and optimistic.
Ability to quickly learn new technologies and possess good trouble shooting skills.
Good interpersonal skills, result oriented, Hardworking with a passion to learn new technologies.
An effective team player with abilities to work collaboratively with team, analyst and client representatives
Mentoring team for project activities, understanding customer requirements and execution.
Educational Qualification:
Bachelor of Technology in Electronics and Communication Engineering from lords institute of engineering and technology in 2016.
Intermediate from NARAYANA JUNIOR COLLEGE in M.P.C
SSC from UNIQUE HIGH SCHOOL
Personal Information:
Name : Sai Krishna.E
Father Name : Mr.Ramakrishna
Date of Birth : 15-07-1994
Nationality : Indian
Religion : Hindu
Languages Known : English, Telugu and Hindi.
I hereby declare that the information furnished above is true to the best of my knowledge and belief. Date: Yours Sincerely
Place: Hyderabad Sai Krishna.E
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