Ashok Sathyanarayanan

Technical Solutions:

• Architecture of latest features for the Verizon 5G standalone and non-standalone network
• Conduct performance trials to fine tune the network performance
• Conduct proof of concept trials for the upcoming 5G features and functionalities
• Provide technical expertise on Verizon's engagements with its OEMs and Device partners for conducting IODT verification
• Troubleshoot issues reported by Verizon and its partners by analyzing UE logs, Network KPIs and DU traces.

Design:

• Architecture, design and implementation of Private Wireless Networks over B48 and N48
• Review of client’s application and use cases to tailor design the best private 4G/5G wireless network
• RF and Capacity planning with relevant to customer use case and premises
• Hardware design for indoor and outdoor small cell RAN products
• PTP and SyncE Timing and Synchronization Design for RAN nodes over backhaul and fronthaul
• Knowledge of networking concepts, deploying VMs and defining security policies on Azure Cloud
• Implementation and maintenance of Network Management Systems, Core network and Firewalls on Microsoft Azure
• Architecture of non-3GPP positioning like Bluetooth Low Energy and Ultra-Wide Band positioning, RAN N48 SA
• Dimensioning and planning the edge cloud or centralized cloud based on client’s latency and security requirements
• Druid 4G/5G core configuration and integration
• Designed a private network in a box
• Focus use cases: Robotics, Warehousing, Perimeter Security, Racing Events and Airport Operations

Validation:

• Validate RAN and Core Network features and functionalities in lab and field
• Call flow troubleshooting of SAS-Domain Proxy interactions, Grandmaster-eNB/gNB interactions, UE-eNB interactions
• Proof of concept trials for evaluating network performance and use cases
• Sales Engineering:
• Attend conferences to meet prospective clients
• Leading the technical demonstrations in conventions to showcase Betacom’s capabilities
• Meet with customers and demonstrate private network using the “Private Network in a Box” solution
• Integrate customer use cases as part of the sales meeting/ demo and prove the usefulness of private networks
• Perform site walks and propose initial net1work design

Other:

• Collaboration with vendor PLMs to develop new feature
• T3 operations support
• Vendor evaluation and introduction
• Communicated with vendors and contractors to incorporate input into product designs.

Design:

• Evaluation of C-Band products and recommend T-Mobile’s strategy for deployment
• Experience with Non-Terrestrial Satellite Network architecture
• Architecture, design, validation and implementation of US’ first 5G mmW, N71 and N41 NW (SA and NSA)
• Massive MIMO beamforming on mmW and N41
• Type 1 CSI Codebook based Single User and Multi-User Downlink MIMO, Uplink Multi-User MIMO
• Throughput improvement and coverage extension using Inter-band NR Carrier Aggregation
• Overall Layer Management Strategy (for LTE and NR combined)
• Dynamic Spectrum Sharing on low band and mid band spectrums
• RF Benchmarking and Link Budgeting of the 5G mmW network
• Collaborate with Qualcomm on device CS’s to validate NW features to support chipset/ device/ MR launch
• Identifying and troubleshooting of network and device issues, and drive the vendors to deliver the fixes on time for launch
• Baseline parameter dimensioning for 5G mmW, Low band and Mid band
• RAN Design Prime for Wireless Emergency Alerts 3.0 – CMAS Geofencing and CMAS over NR
• Architecture and validation of Minimization of Drive Tests feature which feeds the radio condition of the users including their GPS coordinates into tools like Truecall to provide performance improvement suggestions with up to 90% increased accuracy
• 5G NR Feature Designs: UL and DL PDCP Aggregation, NR Carrier Aggregation, 100km Cell Range
• LTE-A Feature Designs: Uplink Carrier Aggregation, Minimization of Drive Tests, Transmission Mode 9 on MBSFN SFs
• Location Technology Feature Designs: CMAS Geofencing, OTDOA, Device based hybrid

Validation:

• Lead field trials for SW features and functionalities
• Troubleshoot device and network anomalies by analyzing layer 3 logs
• Conduct Proof of Concepts by collaborating with cross functional teams and the design organization of the vendor

Design:

• Design prime for T-Mobile’s Wireless Priority Service over VoLTE accepted by Department of Homeland Security
• Driving the end to end (design to deployment) process of ENodeBs software and LTE/ LTE-A features
• Radio Interface design, developing and validating critical RAN technologies including LTE, IMS, VoLTE, HSPA+, UMTS
• Implementation of T-Mobile’s Narrow Band Internet of Things (NB - IOT) network
• Driving the Continuous Delivery project (Agile model for eNB SW development) to ensure that the SW developed for rollout is error-free and verify that the contents of the SW are being delivered within the expected timeline
• Developing complex SQL logic for the markets teams that help drive their feature deployment and configuration cleanup
• Developing automated reports with Tableau, Excel & SQL for auditing various HW, SW & Feature deployment & inventory
• LTE-A Feature Designs: 4x4 MIMO, DL256/UL64 QAM, 3CA, Configurable SCell Priority and 12 stream MIMO
• Location Technology Feature Designs: OTDOA, OTDOA PRS Management and AGLONASS Positioning (on WCDMA)

Validation:

• Create AMOS scripts to support various activities like feature activation, MW test configurations, field activities, etc
• Analyze UE logs and PCAP traces for troubleshooting a variety of issues
• Work with the vendor to reproduce the issues seen in the field to collect traces for further analysis and delivering fixes
• Provide network support for the device validation activities from device vendors
• Inter work with the core network teams like Transport Network, PCRF, HSS, S-Gw and P-Gw teams for the validation of the RAN features having dependencies outside of the RAN

Other:

• Scanner profile creation on OSSs and ENMs and subscription of eNBs to the profile
• Nationwide eNB SW Rollout
• Work with the Tier 2 Operations team to troubleshoot and resolve issues seen in the production eNB software and features
• Reporting the statistics of feature, software and hardware deployment to the management

Design:

• Creating design documents for new features and site solutions
• Worked with the performance team to trial different layer management strategies
• Comparison of carrier aggregation capabilities of different vendors in the network

Validation:

• Analyze the UE logs collected from feature validation in lab and field, Root Cause Analysis of KPI degradations investigated by the National Design team
• Upgrade software on the lab nodes and monitor their stability post upgrade

Design & Optimization:

• Impact of Tropospheric Ducting between various Markets and ways to handle them
• Walk Test in the Sprint Campus and documented the Layer 3 Call flow with explanation from the captured logs
• Interference analysis on the networks and propose coverage/ SINR optimization in downtown Kansas City
• Analyzed Network trends and carried out network performance reporting
• Monitored the FAA/ FCC Bulletins to alert the Local RF Teams about any possible interference

Other:

• Field Integration Testing of new features and software functionality
• Software and OS upgrades on Core Elements such as WSS and MGw by following vendor MOPs
• Hands on experience with LSM-Rs, LSM-Cs MME and eNB
• Created a Web page in Sprint’s intranet for mapping the Network Management Elements like (LSMRs, LSMCs and BSMs)

Drive Based Optimization:

• Identify and troubleshoot network issues like dropped calls, blocked calls, access failures, missing neighbors, coverage holes, pilot pollution areas, SHO/IRATHO failures, swapped feeders, areas of no dominance, overshooting sites, parameter inconsistency through drive log analysis on Orange’s (France) UMTS/ GSM network
• Lead the Drive Test team, by assigning them day-to-day activities and evaluating their reports and data for post processing

KPI Optimization:

• KPI monitoring post SW upgrades and troubleshooting KPI degradation in Orange (France)‘s busiest clusters
• Analyzed layer 3 signaling between the UE and the RAN to ensure proper end-to-end system operation
• Analysis of percentage of time the mobile spends on UMTS, LTE or GSM and optimize the network to retain the users in the LTE or 3G network, thus ensuring higher throughput to the user and propose locations for new site builds
• Inter-RAT and Inter Frequency handover analysis to ensure a seamless service to the users
• RF Coverage Optimization for achieving optimal coverage overlap to solve pilot pollution for Ec/No improvements
• Monitoring on the nodes performance and ordering licenses for sites that could benefit from license increase
• 3G3G and 3G2G neighbors list generation and neighbor list optimization based on KPIs and drive test log analysis
• Developed excel macros to automate the statistical reporting of the time taken for IFHO and 2G to 3G re-selection time, using the Layer 3 messages as input, reducing 30% of the time it took to do it manually.

Drive Based Optimization:

• Drive Testing on WCDMA and GSM Networks to collect data for performance optimization
• Perform in-building, market and cluster level drives for voice/data, long/short calls and Inter/Intra frequency soft and hard handover performance evaluation
• Post-processing and providing support to the client’s RF Engineering Team for creating acceptance reports