Sadhana Avasarala

Residential Address

 

500 W Rand road, Apt # B-305, Arlington Heights, IL-60004

Phone: 847-454-5777.  Email:Sadhana.katragadda@gmail.com

Experience Summary

Technical specialist / Big data architect with 16+ years of experience in Architecting, designing,

developing, and testing various telecom products and big data.

·   5+ years of project management – Agile and SDLC

·   4+ years of experience in Architecting, Designing, Developing, Testing of big data products on cloud platform.

·   16+ years of experience in telecom technologies like LTE and UMTS and Network management protocols, 3G, 4G, IMS and VoIP.

 

Skill summary

 

Patent: Method for traffic steering and network element http://www.google.im/patents/WO2014086898A1?cl=ja

 

Management skills

·   Excellent in project management methodologies, planning, scheduling methods, and tools

·  Excellent interpersonal, collaboration, and problem solving skills

·   Expert in leading Telecom network product/Solution software solution projects.

·  Strong documentation and reporting skills

·   Strong understanding of agile software development, SDLC.

 

Technical Skills

 

BigData Analytics/ Machine learning	Hadoop, Map reduce, Hbase, flume, Sqoop, Oozie, Storm,  Kafka, Tableau,Spark
Cloud platforms	HP cloud stack, Amazon AWS
Programming	Java , Python, Node.js, C++,C
Framework	Spring, Hibernate
Scripting	Unix shell scripting, Perl
Database	Postgres Sql, Cassandra
Tools	Eclipse , SQL Developer , PyCharm, Maven, JIRA
Telecom	LTE, UMTS wireless technologies, SDN, NFV, IMS,SIP, Parley

 

Experience Summary

 

1.       As Software & Systems Specialist in Nokia networks, Arlington Heights/Bangalore since June 2004

2.       As Programmer Analyst in Infosys Technologies, Bangalore from December’2002 to June 2004.

3.       As Senior Software engineer in Mascon Communication Technologies, Bangalore from April 2000 to December 2002

4.      As Software Engineer in I.Comm tele (Formerly ARM Ld), Hyderabad from Aug’98 –March’2000.

 

Education Summary

 

1.       PMP from PMI (August 2011)

2.        B.Tech (E & C), from J.N.T.U Hyderabad, India in May 1998 with Distinction

 

Major Projects 

 

Nokia Siemens networks - Role: Software systems Specialist / Architect

(June 2004 to Till Date)

 

1.      PreCon (Predictive Consultancy) (Apr -2015 – hitherto)

 

Technology used: Mapreduce, Hbase,Tableau, Node.js, Google maps,KML,python.

Predictive Consultancy analyzes the data from various network elements (eNodeB, MME, P-GW,S-GW) to determine cell utilization, voice and data call serviceability, congested and underutilized cells. Precon will then estimate

Responsibilities

Ø       Data model creation for Netact and Traffica Data.

Ø       ETL data from the network configuration files and network data reports

Ø       Analyze and plot the data corresponding to various cells on the Google map

Ø       Predict data using machine learning algorithms.

 

2.       Insight based Orchestration optimization

 

Ø      HCE (Holistic Congestion Estimation) (June 2014 – hitherto)

 

Technology used: Kafka, mapreduce, Hbase,Tableau.

 

A Holistic Congestion Estimation Algorithm was developed after thorough study of 3G and LTE Radio Packet Scheduler behavior.

Holistic Congestion Estimation estimates cell status and subscriber quality of experience based on the subscriber throughput and overall cell capacity utilization status.

 

HCE Sources data from various network management systems reports (Traffica and Netact) of Nokia Networks.  Data is sourced to HCE from Megamon though Kafka queues.

Responsibilities

 

Ø       Providing the sprint requirements, hosting standup meetings and closure of the sprint.

Ø       Development and refinement of HCE algorithm

Ø       Derive and source the data from Nokia Netact and Traffica (network management functions).

Ø       Involved in design and

Ø       E2E testing in lab with Nokia 3G and LTE network.

 

Ø      Network load Serviceability Analysis  (September 2014 – December 2014)

Technology used: Tableau, UML, python

 

Impact of network load on serviceability of voice and data calls is analyzed with cell level data logs that are collected from network management systems like Nokia’s Netact & Traffica.  This project involved in developing the predictive data models using big data analytics and machine learning algorithms.  Analysis was done using Decision Trees, Random Forest and Simple Vector machines (SVM).

 

Responsibilities

Ø       Providing the sprint requirements, hosting standup meetings and closure of the sprint.

Ø       UML Data modeling for the sourced data.

Ø       Exploratory Data analysis in Tableau

Ø       Review the machine learning prediction results of various machine learning algorithms used.

 

Ø      Dynamic Experience management (DEM) August 2012 – June 2014

 

Technology used: Storm, mapreduce, Hbase.

 

Dynamic Experience Management is a multi-vendor solution to provide revenue focused QoE delivery, as per 3GPP policy architecture. DEM Solution generates user and cell insights using big data analytics does policy driven cell and user selection and fully automated user profile updates. DEM provides solution to enable monetization and personalization of user experience.

 

Responsibilities

Ø       Providing the sprint requirements, hosting standup meetings and closure of the sprint.

Ø       Research 3G, LTE networks to identify various network messages, reports to identify network load status.

Ø       Derive and source the data from Nokia Netact and Traffica (network management functions).

Ø       Design and development of ETL layer and orchestration layer. ETL layer uses Strom source files. Orchestration layer has an algorithm built which analyses data and determines the cell status and takes actions accordingly.

Ø       E2E testing in lab with Nokia 3G and LTE network.

 

DEM modifies customer network parameters like QoS, bandwidth based on subscriber policy, subscriber viewing habits, network conditions and the type of the application the subscriber is using. Based on the predefined parameters subscribers would either continue to use UMTS/LTE network they are homed in or will be moved to the other network where congestion is low.   We have filed a patent on traffic steering.

Ø      Traffic Steering. October 2011 – August 2012

Traffic steering evaluates the load levels of the overlapping / neighboring cells of different RATs or hierarchy layers, the loads and capacities of their transmission networks, and  the actual usage (including the historical data) of their networking services by users. Traffic steering then decides to steer user terminals from a resource layer (RAT, or hierarchy layer) to another resource layer to maximize resource use and QoE for users. The steering can work for different goals set by operator. Traffic Steering balances the loads between the cells of different RATs and improves the QoE.

 

Responsibilities:

Ø       Project plan creation and execution

Ø       Study of 3GPP LTE and 3G network, ANDSF Standards.

Ø       Research of 3G and LTE network to identify various parameters indicating network conditions and subscriber profiles and parameters.

Ø       Creating the use case to for the traffic steering.

Ø       Designing, developing and testing of Traffic steering PoC

 

3.      Content delivery networks in LTE network. January 2011 – October 2011

          Investigate and propose content delivery network and media optimizer location in LTE. 

·            Study of 3GPP LTE standards, IFOM, ANDSF and other standards.

·            Identifying CDN surrogate location in LTE network

·            Identifying different CDN techniques to ensure content to be cached and ensuring its freshness

   Responsibilities:

Ø       Delivering white paper on CDN, surrogate locations, various methods to be used

Ø             Creating relevant feature requests to the development teams

 

 

4.      VoIP module development and testing for WiMAX CPE.

           Cable modems are capable of making voice calls. Reusing codebase from Cable modem to Wimax CPE.

Ø          Adapt codebase to suit to the Wimax CPE

Ø          Identify and implement the missing pieces

Ø          Overall box and system testing.

Responsibilities:

 

 

5.       Development of Call processing features in Wimax CPE.

          Involves development and customization of Supplementary Call features in Wimax CPE

Ø             Design of Call processing features to suit to the customer needs.

Ø             Interoperability testing with Voip switch in customer network.

 

6.       Interoperability and acceptance testing and support                   

         Interoperability and acceptance testing of Wimax CPEs with various IMS/VOIP switches and fixing           the issues identified.

Ø             Interoperability testing

Ø             Fixing of the issues

Ø             Field testing and acceptance testing

Ø       Expedience PC cards - Support of Expedience PC card issues.

 

7.       Dispatch application processor (DAP) component integration testing and box testing.

               Dispatch Application processor is a iDen Box that takes care of registration of subscribers and routing two party calls, group calls

Ø             Integration of various modules in DAP

Ø             Component Integration testing of DAP

Ø             Box Testing of DAP with other simulators in Motorola iDen network.

 

8.       Net Dispatch Messenger (NDM)

Net dispatch messenger is a PC based phone, which has all the features of the iden phones and more. From NDM we can make Private calls, group calls, user defined group calls, send a prerecorded message.

Responsibilities

Ø             Was responsible for delivery of Net Dispatch messenger

Ø             Development and testing of net dispatch messenger

Ø             Mentoring and coaching junior members of team

Ø              

 

9.       Voice and Signaling Gateway(VSGW)

            VSGW is a gateway between iDEN Network and 3G sip network.  VSGW will allow an iDEN user to make a call to 3G network  3G network will see VSGW & iDEN network as another domain available to it.  And iDEN will see VSGW & 3G network as another cell site where users can make calls or roam to.

      Responsibilities:

Ø                      Design, development and testing of Selective dynamic group call feature

 

Infosys Technologies Limited – Role: Project Lead

(December 2002 to May 2004)

 

1.       Port Exchange

            Port Exchange software operates on the OrderPath framework and manages the wireless  pre-port inter-carrier communication process between other wireless and wireline carriers  Operating on the OrderPath framework allows users to have one single consistent web-based  GUI for LNP, OSS Interface and inter-carrier communication activities

 

2.          Numeric Track.

         NumeriTrack is telecom’s number conservation and inventory management system. This                                               System is in fully compliant with FCC mandate while providing 3G wireless support                                                    For SIM and IMSI inventory and WNP support for MIN. It also provides single global view                                                     of all DNs of the service provider.                                  

 

Mascon Communication Technologies - Role: Senior Software Engineer

(April 2000 to December 2002)

 

1.       AnyPath Migration Application

 

This project involved in migration of existing subscribers from Lucent proprietary Sierra CA machines to new ones Any Path machines. So this migration involved creating an application called AMA This application consisted of 3 modules source adapter, converter adapter and destination adapter. Source adapter fetches data from sierra, converter converts it from source format to destination format and destination puts the converted data into Any Path.

 

2.       Feature Execution Environment.

 

The Feature Execution Environment (FEE) is the logical execution environment for  the features developed by the Service Creation Environment.  The Service Creation Environment creates features like Basic call, call transfer, Call Hold. Whenever Parlay server sends event for a subscriber, FEE checks whether an event for a subscriber, FEE checks whether the subscriber is valid or not and features that he has subscribed to.  If the subscriber has subscribed to that feature, the dispatcher will dispatch the event to that feature, which can process  that event.

 

3.       Service Creation Environment.

The Service creation environment (SCE) is the creation environment for the features. The Service

Creation Environment creates features like Basic call, call transfer, Call Hold.Etc. 

 

4.       Parlay Client Conformance Tool                                                 . 

This is a tool which tests whether the parlay client developed by third party is parlay conformant or not.  This tool basically takes input from a script file, parses it and simulates events and waits for expected response.  This sends the events that will actually simulate the call.  In that way it can even tell for what all features it is parlay complaint and for what features its not.  It keeps track of no of valid responses and based on that it will decide whether it is parlay complaint or not.  This also checks whether parlay client is authorized or not.  This includes implementation of Mutltiparty call control services and frame work services.  This way communication between parlay client conformance tool and parlay client is CORBA.

 

5.       WAP Gateway

The project consisted of design and development of WAP Server and Gateway. The WAP Gateway consisted of SMS Box, Bearer Box and WAP box. TCP was used as communication protocol.

 

 

I.Comm Tele – Role: Software Engineer

(Aug 1998 –March 2000)

 

1.       Frequency Hopped Time Division Multiple Access

 

The objective of this project is to communicate with the remote station using the space Wave propagation with TDMA. This system can have one base and 16 remote station. It basically operates in one of the two modes: OW mode and BC mode. In the OW mode either base of remote can initiate the communication. 

 

2.       Digital loop Carrier on optical fiber cable

 

The main objective of this project (DLC) is to provide a solution in access network by  introducing optical fiber in local loop(exchange to subscriber loop. This system can be connected to various network topologies having a maximum of 16 remote terminals.

 

3.       Vehicle monitoring system

 

Highway automation system of monitoring the location of the vehicle base stations is connected through the satellite link and communication between base and vehicle is done using OFK modulation.