Kopperla Ranjith Kumar

Experienced software architect specializing in 5G/4G call software architecture and wireless systems. Extensive knowledge of 2G/4G/5G in RAN and CORE network domains, along with a deep understanding of 3GPP standards and protocols.

With 17 years of industry experience, successfully designing and implementing efficient solutions to optimize network performance and enhance user experience.

• Filed two patents related to Core Network and PCF UE Policy Enhancements.
• Published a paper in IEEE CONNECT 2021.
• Played a pivotal role in Samsung’s Integration team for JIO 4G commercialization.

• Currently leading the RAN System Design for 2G/4G/5G NodeB (Access Unit and Digital Unit) Layer 3, focusing on both Traditional and Virtualized RAN.
• Ability to coordinate across diverse technical areas, manage complex stakeholder interactions, and drive successful project outcomes in cross-functional and multi-vendor environments.
• Versatile experience in interfacing and collaborating with multiple vendors and working closely with various development and verification teams, including Call Processing, Bearer, System Software, OAM, and Cloud.
• Managed cross-functional teams across Access & Core networks, System Software, Call Processing, OAM, and User plane.
• Served as Call Processing Architect for 4G LTE products and led the design, development, and support for 4G/5G Core and RAN teams.
• Key leader in handling customer requirements and interfacing with various teams for RAN System Design.
• Managed 4G Core Technical teams addressing JIO customer field issues and led 5G PCF NF in a cloud-native environment.
• Extensive experience in developing and supporting 4G SGW and PGW, 5G AMF, SMF, and UPF in distributed systems.

Operating Systems:          Linux, Solaris, Windows

Programming Languages:          C, C++

Domain Knowledge:

RAN: 2G, 4G, 5G

5G Core: SMF, UPF, PCF, AMF, UDR

4G Core: MME, S-PGW (GW-C and GW-U), PCRF, IMS Nodes

Protocols:

2G: A, Abis, BSSAP

4G/5G RAN: LTE-RRC, NR-RRC, S1AP, X2AP, XNAP, LTE-NAS, LTE-ESM, LTE-EMM

4G Core: S1AP, GTP,           Gx, Gy, Gz, Sx

5G Core: N1, N2, N3, N4, Npcf, Nsmf, Namf

End-to-End Flows:           Extensive experience with complete end-to-end call flows involving multiple network components (e.g., UE, eNB, MME, HSS, SGW, PGW, PCRF,           OCS, OFCS, ePDG, TWAN).

RAN Callp System Design, Samsung:

• Led the System Design team for over 20 customers in 4G RAN (tRAN and vRAN) and 3+ customers in 2G vRAN.
• Supported key 5G features, including trace functionalities and 4G-5G interfacing (e.g., EN-DC).
• Engaged directly with customers and internal teams (development and verification) to gather and understand requirements.
• Translated customer requirements into clear functional specifications.
• Provided ongoing support to implementation and verification teams to ensure requirements were met and delivered to the customer effectively.

Samsung 4G (SPGW):

• Worked on Samsung’s Serving and PDN Gateway product supporting SGW, PGW, and SPGW modes with CUPS.
• Led the SPGW team, overseeing the design, development, and unit testing for new requirements across SGW and PGW nodes.
• Provided support for all Core Network nodes (MME, SGW, PGW), serving over 300 million subscribers.
• Ensured timely resolution of field issues to prevent escalations, maintaining high service quality.
• Supported verification and local teams to ensure seamless integration and functionality of the network components.

Samsung 5G Core Development (PCF):

• Led the design and development of the 5G PCF product from scratch, including software architecture design and interface specifications.
• Initiated Development: Started the development of a new network function (PCF) from the ground up.
• Requirements Analysis: Conducted in-depth specification studies to understand project requirements.
• Functional Requirements Conversion: Translated specifications into actionable functional requirements.
• Software Development: Developed the functional requirements into a fully implemented solution.
• Architectural Design: Designed the software architecture and finite state machine (FSM) for the PCF.
• Implementation & Support: Implemented the new network function and provided ongoing support to verification teams.

EPC TAC-3 Master, Samsung:

• Led multiple development teams, including Call Processing across all EPC nodes, System Software, OAM, and Cloud, ensuring cohesive project execution.
• Oversaw all support teams, being accountable for the successful execution of the entire project lifecycle.
• Served as the primary point of contact for resolving customer field issues within Samsung EPC, focusing on timely resolutions and minimizing escalations.

System Integrator for JIO 4G Commercialization:

• Network Rollout Leadership: Acted as a System Integrator for Samsung, overseeing the complete rollout of the JIO 4G Network.
• Issue Analysis: Analyzed end-to-end logs to identify nodes causing issues, providing necessary recommendations for resolution.
• Vendor Coordination: Led interfaces with all network vendors, playing a crucial role in the successful commercialization of JIO 4G services.

Benu Networks -

• Worked on Wireless Access Gateway (WAG) to support WiFi clients, developing IPv6 and dual-stack functionality.
• MME, SGW Functions Development for LTE on Benu Platform, Developed interfaces between SGSN, MME, and SGW for LTE.

Wipro :

• SGSN R&D, Developed and maintained Nokia SGSN, working on feature development and resolving field issues for NSN.
• IBM - GSM HLR Development and Support, Developed and maintained Nortel HLR on the ATCA chassis, working on new feature development and customer support.