Andrei S.

Sysops Engineer

345 dollar
Freelancer
6 years
Bucharest, ROMANIA

My experience

More

Digi KftNovember 2017 - January 2019

Company description:
Meets the specific activities of radio access networks (design, implementation, scaling, monitoring, optimization) for coverage and capacity in an environment of futuristic network LTE+GSM for VoLTE and data by daily operations, aimed at ensuring the maintenance of performance and quality of service within certain limits. 

 Responsibilities: 
- Preparing the working set for Drive tests. 
- Creating the Test scenarios for VoLTE and VoFI and testing. 
- Testing the mobile phones for the network. 
- Pre Launch Design of the network using new sites and collocations. 
- Pre Launch Optimization using internal tools. 
- New Network Design and Optimization internal tools requirements. 
- PCI/TAC/PRACH planning rules 
- BCCH/LAC/BSIC planning rules 
 - Call Drop analysis based on OSS and drive test KPIs 
- Handovers Optimization to improve their SSR and balancing traffic also (event A1, A3, A4 and A5, B1, B2, B4) 
- Improving the cell edge performance and how to increase the cell capacity (interference reduction) 
- Familiar with the basic 4G algorithms (Power control, handover, scheduling, Call setup....) 
- IRC, UL COMP, MIMO, ANR , CSFB, X2 HO, S1 HO, Cell reselection algorithm and flowchart 
- LTE Throughput optimization 
- LTE+GSM Drive Test analysis with Nemo Outdoor 
- Radio measurements check, design check , power calculation for indoor coverage equipment; 
 - Indoor coverage Design , Implementation and Optimization using Repeaters , Small Cells, or RRH(RRU) taking care about DAS Sharing between Mobile Operators, power budget , EMF , capacity and cost efficiency; 
- Site Survey and Acceptance for DAS using radio measurement tools (Nemo handy, Tems Pocket, Site Master, PIM Analyzer); 
- Build of Materials and forecast for passive and active equipment needed on the Indoor Coverage Project; 
 - Analyzing and testing the new passive components for DAS and writing the test report for the internal use; 

Projects: 
Design and Implementation: 

- 9 Mall areas 
- DAS design and implementation 
- DAS models for hyper market ( Tesco, Auchan and Inter-spar) 
- DAS connection solutions for Big indoors (Duna Arena - pool , Metro Budapest ) 

Technical Lead: 
- LTE 3500 TDD 
- test and implementation 
- Refarming - new frequency plan to combine the LTE 1800 and DCS 1800 in 4.9 MHz
- In several RFQ for radio materials 

 Accomplishments: 
- Implementation of an internal tool for design and optimization, using the newest ideas and fine tuned on the network. 

 Acquired skills and knowledge:
LTE FDD, LTE TDD, GSM, Radio Access Network Design and Optimization, Implementation Engineer, Project Management , VoLTE , VoFI, Indoor Coverage Design, Small Cell Design, Trainer Radio Design, Active DAS

More

RCS - RDS S.A. (DIGI Mobile)March 2017 - November 2017

Company description: 
Meets the specific activities of radio access networks (design, implementation, scaling, monitoring, optimization) for coverage and capacity in an environment of multiple technology (UMTS, LTE, both for voice services as well as data transfer, WiFi) by daily operations, aimed at ensuring the maintenance of performance and quality of service within certain limits 

Responsibilities: 
- Work with RF teams to perform advanced in-depth design, troubleshooting and optimization of the LTE TDD & FDD and UMTS RF sites. Use combination of tools and methods to solve LTE/WCDMA network/design problems; 
- Analyze the specifics of LTE and WCDMA optimization(parameters, Key Performance Indicators) and recommend methods to integrate the LTE and UMTS optimization processes under a single umbrella; 
- Work with RF teams to investigate degradation in RF site performance: identify, analyze, solve and document complex troubleshooting situations, especially at the border between the two technologies. Make recommendations about how to avoid similar situations in the future; 
- Work with RF teams to investigate degradation in UMTS and LTE RF site performance, breaks down problems, validates causes and solutions; cooperate with O&M in advanced troubleshooting of HW & SW equipment issues; 
- Microwave design for new radio link. 

 Accomplishments:
- Design of Coverage on wheels site, for special events 

 Acquired skills and knowledge: 
UMTS, LTE FDD, LTE TDD, Radio Access Network Design and Optimization, Implementation Engineer, Microwave

More

NokiaJanuary 2017 - March 2017

Company description: 
Nokia is a global leader in the technologies that connect people and things. Powered by the innovation of Bell Labs and Nokia Technologies, the company is at the forefront of creating and licensing the technologies that are increasingly at the heart of our connected lives. With state-of-the-art software, hardware and services for any type of network, Nokia is uniquely positioned to help communication service providers, governments, and large enterprises deliver on the promise of 5G, the Cloud and the Internet of Things. 

Responsibilities: 

- Installation and commissioning of the RAN product for testing; 
- Analyzing system concepts and complex product and system features; 
- Test environment planning, building, integration and maintenance; 
- Creates automated test suites and scripts for relevant test tools;
- Executing test cases manually against real equipment; 
- Reporting test results into tools and generation of test reports; 
- Writing defect reports and verifying corrections; 
- Review requirements and participates on the early stages of specification creation, provide specification solutions based on the current code. 

 Acquired skills and knowledge: 
Software Testing, UMTS, GSM, LTE, Software Analytics, Nokia Flexi 10, Nokia AirScale, Integration and Commissioning

More

Vodafone RomaniaSeptember 2014 - December 2016

Company description: 
Meets the specific activities of radio access networks (design, implementation, scaling, monitoring, optimization) for coverage and capacity in an environment of multiple technology (GSM, UMTS, LTE, both for voice services as well as data transfer, WiFi) by daily operations, aimed at ensuring the maintenance of performance and quality of service within certain limits 

 Responsibilities: 
- Work with RF teams to perform advanced in-depth design, troubleshooting and optimization of the UMTS and GSM RF sites. Use combination of tools and methods to solve WCDMA/GSM network/design problems; 
- Analyze the specifics of UMTS and GSM optimization(parameters, Key Performance Indicators) and recommend methods to integrate the GSM and UMTS optimization processes under a single umbrella; 
- Work with RF teams to investigate degradation in RF site performance: identify, analyze, solve and document complex troubleshooting situations, especially at the border between the two technologies. Make recommendations about how to avoid similar situations in the future; 
- Work with RF teams to investigate degradation in UMTS and GSM RF site performance, breaks down problems, validates causes and solutions; cooperate with O&M in advanced troubleshooting of HW & SW equipment issues; 
- Radio measurements check, design check , power calculation for indoor coverage equipment; 
 - PIM analyzing and troubleshooting on Distributed Antenna systems; 
 - Indoor coverage Design , Implementation and Optimization using Repeaters , Small Cells , Femto cells, or RRH(RRU) taking care about DAS Sharing between Mobile Operators, power budget , EMF , capacity and cost efficiency; 
- Site Survey and Acceptance for DAS using radio measurement tools (Tems Pocket, Site Master, PIM Analyzer); 
- Build of Materials and forecast for passive and active equipment needed on the Indoor Coverage Project; 
- Analyzing and testing the new passive components for DAS and writing the test report for the internal use; 

Projects: 
Design and Implementation: 

- SNSPA 
- Passive DAS for new University building with 12 Floors and 60 cm walls; 
- City Mall Constanta 
- Passive Das on a new comercial area 30 000 square meters; 
- Vodafone HQ 
- Design and Implementation of the First MIMO Das in Vodafone Romania; 
- Oregon Park 
- 2 Office Buildings with high density of UE;
- Afi Park 4 & 5 - 2 office buildings with 12 Floors; 

 Redesign of DAS: 
- City Gate - 2 office building with 26 floors , Creating a new design of the DAS with capacity optimization and power increase +20 dB; 
- America House - Office building with during the time capacity have increase , new design was made;
- Iulius Mall Timisoara - New design for best 4G+ Customer Experience; 

 Tehnical Lead: 
- Frequency Change Project P-GSM to E-GSM movement of Vodafone Romania; 
- Refarming Phaze 3 - Move from GSM900 and U900 to DCS1800 and UMTS 2100 - at the final of the Frequency Change; 

 Accomplishments: 
- Creation of a tool to generate the radio work order for the indoor cells. 
- Work optimization procedures for faster diagnosing of customer radio necessity. 
- Create a work around to update the databases after Ran Sharing new radio stations 
- Create a NO LOSS TX solution for the white zone project using LTE800 as a back-hole for the new station 

 Acquired skills and knowledge:
UMTS, GSM, LTE, Radio Access Network Design and Optimization, Implementation Engineer, Indoor Coverage Design, Small Cell Design, Trainer Radio Design, Trainer Radio Troubleshooting, Femto Cell , Active DAS

More

Fortitudo and Company SRLSeptember 2013 - September 2014

Company description: 
The enterprise is subcontractor of Huawei Technology which provides installation, configuration, modifications and commissioning of radio stations and equipment for telecommunications for telecommunications operators from Romania and Republic of Moldova. 

 Responsibilities:
- Integration of new Huawei BSCs, RNCs, BTSs, DBS3900, LTE, NodeB in live customer Network; 
- Following the subcontracted work from receipt to their reception by the operator;
- Making configurations for the mobile equipment - cell site GSM,UMTS and LTE working on the entire Huawei Radio Equipment Family Huawei BBU3900, Huawei BBU3806, Huawei RBS3812; 
- Commissioning and configuration of wireless products, re-homing of base station using internal tools (CME); 
- Hardware-support for diagnosing problems that occurs in the field; 
- Remote support and troubleshooting for integration engineers, customer and 3rd party; 
- Making work procedures for the project according to the mobile equipment; 
- Provide the contracted customer support services; 
- Give technical support to sales, marketing, project managers and the customer, including pre-sales activities that can control and supervise radio access network implementation; 

 Accomplishments: 
- Work optimization procedures for faster hardware problem diagnosing; 
- Training technicians and engineers to minimize the time spent on the station Developing software to generate scripts for LTE stations; 

Acquired skills and knowledge: 
OMC, UMTS, GSM, LTE, Integration and Commissioning, On Field Engineer support

More

Ericsson Telecommunications Romania SRLAugust 2012 - August 2013

Company description: 
Telecommunications Company that offers to their customers, equipment, service and maintenance. 

Responsibilities: 
- Monitoring of radio equipments GSM, UMTS and LTE; 
- Ground-support teams to resolve Hardware troubles; 
- Following number of tickets coming from external partners; 
- Knowledge of operation and configuration of Huawei radio equipment (DBS3900 and DBS3800) and Nortel (S18000, S12000 and ECELL); 
- Knowledge of operation and configuration broadcasts Ericsson (Mini-Link), Alcatel (SDH), Nortel (SDH), Huawei (PTN910) Rad Modem (LA130) and Crohus Modem; 

Accomplishments: 
Diagnostic process optimization problems by adding new tests, thus reducing the number of physical interventions stations. 

 Acquired skills and knowledge: 
PDH, UMTS, GSM, SDH, LTE, Field Support Engineer

More

FRAUNHOFER IPAJune 2011 - June 2011

Company description: 
Among the most important research centers in Europe has multiple patents and patents of innovation among which MP3 format 

 Responsibilities: 
- Design and execution of the command and control structures used in production processes. 
- Optimization of industrial production.

Accomplishments: 
- Optimizing the production process from 10s to 0.5s by creating a new command and control structure. Reducing the cost of production of a PCB with 70% by redesigning it.

My stack

Protocols

GSM/GPRS/EDGE/UMTS, HSUPA, UMTS, GPRS, EDGE, GSM

IT Infrastructure

DAS, Network Design

Others

FDD, Analysis, IoT, Troubleshooting, Design, Project Management, Netcool

Technologies

Implementation

Software testing

Test Driven Development (TDD), Test Cases, Software testing

Embedded and Telecom

HSPA, HSDPA, LTE, VoLTE, WCDMA

My education and trainings

Trainings - Huawei Technology

Datax SON software overview and configuration procedures - Datax2016 - 2016

Femto Commissioning and Troubleshooting Alcatel Lucent (Nokia) solution - Alcatel Lucent2016 - 2016

Bachelor Degree - Electronics and Telecommunications - University of Pitesti, Faculty of Electronics, Communications and Computer science2008 - 2013

Trainings - Ericsson Academy2012 - 2012