Basudev Mukherjee

Client: Internal

Technologies: 5G/NR , C/C++

Role L3: Developer

Focus Area: E1c Interface – Control Plane (gNB-CU-CP ↔ gNB-CU-UP) | NR-CUUP Module

• Transitioned to the 5G L3 Development team from TAC, focusing on the E1c interface, which handles control plane signaling between gNB-CU-CP and gNB-CU-UP.
• Upgraded and extended the Unit Test (UT) framework for the NRUP module, improving code coverage from 40% to over 80%.
• Continuously enhancing test coverage by integrating support for new features and aligning with ongoing development efforts.
• Preparing to take up feature design and development responsibilities within the NRUP module as part of upcoming roadmap deliverables.

Clients Supported:

• Rakuten (Japan Kiba Lab) – 3 years
• Telus (Canada) – 1.5 years
• Telefonica (Germany, UK, India Labs) – 2 years

Role: TAC Lead – L3 Technical Support | Log Analysis & RCA | RAN

Debugging | Cross-Team Coordination

• Led a team of 10+ TAC engineers, providing L3/TAC3 support across lab and field environments for 4G LTE, 5G NR, and ORAN deployments.
• Managed resolution of over 560+ customer-reported issues, including:
• 200+ bugs for Rakuten (Japan)
• 180+ bugs for Telus (Canada)
• 180+ bugs for Telefónica (Germany/UK/India)
  – spanning RIU, PHY/L1, L2 (MAC, RLC, PDCP), L3 (RRC, GTP), OAM, and Platform modules.
• Specialized in deep log analysis and root cause identification:
• Conducted end-to-end debugging using trace logs, internal tools, and strong understanding of the 3GPP RAN protocol stack (L1–L3)
• Identified issue patterns across layers and reproduced defects in lab setups to drive effective triage
• Reduced turnaround time by delivering high-quality, actionable RCAs before escalation to development teams
• Independently authored and shared over 170+ RCA documents for critical and recurring issues:
• 50+ RCA reports for Rakuten
• 60+ each for Telus and Telefónica
• Ensured clarity, traceability, and alignment with customer expectations, accelerating resolution cycles
• Acted as the primary technical contact post-bug report:
• Led triaging, RCA, assignment to relevant dev teams, and tracked issues through closure
• Closely collaborated with Development, QA, and Customer Engineering teams to drive resolution
• Prioritized and fast-tracked high-impact and release-blocker bugs, enabling timely software rollouts and successful field upgrades
• Provided emergency and on-call support during escalated field trials and upgrade windows
• Facilitated cross-functional coordination between Dev, Customer QA, and In-house QA teams to streamline bug reproduction, validation, and fix verification
• Contributed to operational improvements by maintaining structured bug monitoring, handling escalations, and documenting internal knowledge base articles for known issues

Client: Internal R&D

Technologies: 4G LTE, EN-DC, C/C++

Role: L2/L3 Developer

Worked on EN-DC feature integration to enable dual connectivity between eNodeB (Master Node) and gNodeB (Secondary Node) via the X2 interface. Enhanced data throughput by enabling DRB setup using EUTRA-PDCP and NR-PDCP.

• Developed and enhanced PDCP layer logic within the LTE stack to support EN-DC bearer configuration for 5G NR integration.
• Worked on X2-based signaling procedures and DRB establishment, in line with 3GPP EN-DC specifications.

Involved in feature-level debugging, functional testing, and code-level validation of the dual connectivity implementation.

Client: Parallel Wireless

Technologies: 3G UMTS, C/C++

Role: RRC Developer

Worked on implementation of hard handovers (IFHO & IRHO) in the RRC module, enabling mobility across 3G inter-frequency cells and inter-RAT transitions to 2G/2.5G/4G, using coverage-based triggers.

• Designed and developed UE FSM, MEAS FSM, CELL FSM, and L1 FSM logic within the RRC module to support inter-frequency and inter-RAT handover procedures.
• Performed end-to-end unit testing for 3G–3G (IFHO) and 3G–4G (IRHO) call flows.
• Resolved 90+ Jira issues related to handover and core 3G features independently.

Worked onsite at client location for 2 years, contributing to development, testing, and live support.

Client: Alcatel-Lucent R&D

Technologies: 3G UMTS, C/C++

Role: L3 Developer

Worked on ACSE feature enhancement to allow automatic carrier and cell shutdown during low-traffic windows in overlay cells, and corresponding reactivation based on traffic thresholds or time-based conditions. The logic enabled dynamic energy optimization and traffic-based capacity management at Node B via RNC-controlled triggers.

• Designed ACSE support for multiple overlay cells (≥3) and one base cell, managed through dynamic traffic assessment logic.
• Implemented unit test identification and development for various switching scenarios.
• Developed feature logic for switch OFF/ON mechanisms using RL, POWER, and RL_POWER-based triggers.
• Built simulation handling for testing RL, POWER, and RL_POWER-based switching logic under controlled test conditions.

Clients: Qualcomm, Nokia Siemens Networks

Technologies: 3G UMTS, 2G/2.5G, C/C++, TEL Scripting

Roles: L3 Developer (FAP), Integration & Test Engineer (MOCN)

• Developed and tested Home NodeB (FAP – Femtocell Access Point) features enabling UE communication with HNB-GW aggregating multiple HNBs in 3G UMTS networks.
• Designed and implemented FAP initialization procedures and UE measurement handling.
• Prepared and executed unit test plans, system integration, and load testing (supporting up to 32 UEs for CS and PS).
• Conducted bug fixing and validation in end-to-end setups for stable feature delivery.
• Performed unit testing, integration testing, and bug fixes for MOCN (Multiple Operator Core Network), supporting shared Radio Access Network for multiple core networks across 2G/2.5G systems.
• Developed and executed test scenarios using SGSN/mobile emulators and tools like Trace32, Wireshark, and Putty.
• Automated test runs using TEL scripting and supported end-to-end call flow validations ensuring interoperability and robustness.