Ramanujan (Ram) Sheshadri

I work at Nokia Bell Labs on network systems and security research, with a particular focus on 5G/6G cellular RAN, Open-RAN, and wireless communication systems. I work on real-time network optimization solutions using agentic AI and closed-loop deep reinforcement learning, end to end across PHY/MAC/network-layer protocol design, software implementation, and hardware testbed prototyping.

In the past, I've worked extensively on autonomous UAV networks, wireless (biometric) sensing and real-time localization, building systems that fuse RF (UWB/WiFi), visual, and inertial data for accurate tracking at scale, translating these solutions from research prototypes into deployed, field-tested products.

Publications

Cellular Networks (O-RAN / 5G / 6G)

Odin: Effective End-to-End SLA Decomposition for 5G/6G Network Slicing via Online Learning
D Cheng, RK Sheshadri, A Kak, N Choi, X Zhou, B Ji
ACM MobiHoc, 2025.
INTEGRan: Towards Vertical and Horizontal Integration for Programmable RAN Performance Optimization
A Kak, V-Q Pham, H-T Thieu, RK Sheshadri, N Choi
IEEE INFOCOM Workshops, 2024.
AWeRAN: Making a Case for Application-Aware Radio Access Network Slicing
A Kak, H-T Thieu, V-Q Pham, RK Sheshadri, N Choi, Y Guan, M Yin, T Han
ACM WinTech Workshop, MobiCom, 2023.
ELI: Empowering LTE with Interference Awareness in Unlicensed Spectrum
RK Sheshadri, K Sundaresan, E Chai, S Rangarajan, D Koutsonikolas
IEEE ICNP, Cambridge, UK, 2018.
Blue-printing Interference for Robust LTE Access in Unlicensed Spectrum (Best Paper Finalist)
RK Sheshadri, K Sundaresan, E Chai, A Khojastepour, S Rangarajan, D Koutsonikolas
ACM CoNEXT, Incheon, South Korea, 2017.

Multi-modal Sensing and Autonomous Systems

Medusa: Scalable Multi-View Biometric Sensing in the Wild with Distributed MIMO Radars
Y Li, RK Sheshadri, K Sundaresan, E Chai, Y Zeng, J Raghuram, S Banerjee
ACM MobiCom, Hong Kong, 2025.
Large Network UWB Localization: Algorithms and Implementation
N Garg, I Shahid, RK Sheshadri, K Sundaresan, N Roy
USENIX NSDI, 2025.
Fast Localization and Tracking in City-Scale UWB Networks
N Garg, I Shahid, RK Sheshadri, K Sundaresan, N Roy
Tech. report, arXiv:2310.02211, 2023.
Bringing AR/VR to Everyday Life—A Wireless Localization Perspective
N Garg, I Shahid, K Sankar, M Dasari, RK Sheshadri, K Sundaresan, N Roy
ACM HotMobile, 2023.
RoVAR: Robust Multi-Agent Tracking Through Dual-Layer Diversity in Visual and RF Sensing
M Dasari, RK Sheshadri, K Sundaresan, S R Das
Proc. ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT/UbiComp), 2023.
“Is WiFi 802.11mc Fine Time Measurement Ready for Prime-Time Localization?” (Best Paper Award)

S Aggarwal, RK Sheshadri, K Sundaresan, D Koutsonikolas, in ACM WiNTECH Workshop, MobiCom, 2022.

SkyHaul: A Self-Organizing Gigabit Network Fabric In The Sky
RK Sheshadri, E Chai, K Sundaresan, S Rangarajan
ACM MobiHoc, Shanghai, China, 2021.
SkyHaul: An Autonomous Gigabit Network Fabric In The Sky
RK Sheshadri, E Chai, K Sundaresan, S Rangarajan
Tech. report, arXiv:2006.11307.
On Packet Loss Rates in Modern 802.11 Networks
RK Sheshadri, D Koutsonikolas
IEEE INFOCOM, Atlanta, Georgia, 2017.
AmorFi: Amorphous WiFi Networks for High-density Deployments
RK Sheshadri, M Arslan, K Sundaresan, S Rangarajan, D Koutsonikolas
ACM CoNEXT, Irvine, California, 2016.
Comparison of Routing Metrics in 802.11n Wireless Mesh Networks
RK Sheshadri, D Koutsonikolas
IEEE INFOCOM, Turin, Italy, 2013.
A First Look at 802.11n Power Consumption in Smartphones
N Warty, RK Sheshadri, W Zheng, D Koutsonikolas
PINGEN Workshop, ACM MobiCom, Istanbul, Turkey, 2012.
Evaluation of Routing Metrics in an 802.11n Wireless Mesh Network
RK Sheshadri, J Inamdar, R Kundalkar, D Koutsonikolas
IEEE INFOCOM (Student Poster), Orlando, Florida, 2012.

Mobile Computing

Characterizing Mobile User Habits: The Case for Energy Budgeting
RK Sheshadri, I Pefkianakis, H Lundgren, D Koutsonikolas, A Pietilainen, A Soule, J Chandrashekar
IEEE GlobalSIP, Hong Kong, 2015.
Power-Throughput Tradeoffs of 802.11n/ac in Smartphones
S K Saha, P Deshpande, P Inamdar, RK Sheshadri, D Koutsonikolas
IEEE INFOCOM, Hong Kong, 2015.
Modeling WiFi Active Power/Energy Consumption in Smartphones
L Sun, RK Sheshadri, W Zheng, D Koutsonikolas
IEEE ICDCS, Madrid, Spain, 2014.

Journals

Experimental Evaluation of WiFi Active Power/Energy Consumption Models for Smartphones
L Sun, RK Sheshadri, H Deng, W Zheng, D Koutsonikolas
IEEE Transactions on Mobile Computing (TMC), Feb 2016.
An Experimental Study of Routing Metrics in 802.11n Wireless Mesh Networks
RK Sheshadri, D Koutsonikolas
IEEE Transactions on Mobile Computing (TMC), Oct 2013.

Patents Awarded

Realizing enterprise-grade localization using WiFi 802.11mc fine time measurement
R Sheshadri, K Sundaresan, S Aggarwal
US Patent No. 12,543,019, 2026.
Simultaneous localization and synchronization across multiple antennas
M Khojastepour, R Sheshadri, M S Rahman
US Patent No. 12,335,899, 2025.
Device tracking with radio ranging and sensor functions
R Sheshadri, K Sundaresan, M S Rahman
US Patent No. 12,207,226, 2025.
Visual and RF sensor fusion for multi-agent tracking
K Sundaresan, R Sheshadri, M Dasari
US Patent No. 12,000,945, 2024.
Unmanned aerial vehicle network
E Chai, S Rangarajan, K Sundaresan, R Sheshadri
US Patent No. 11,356,172, 2022.
System and method for enabling interference-awareness for LTE operation in unlicensed spectrum
K Sundaresan, E Chai, R Sheshadri, M Khojastepour, S Rangarajan
US Patent No. 10,469,188, 2019.
System and method for dynamic provisioning of Wi-Fi capacity in large venues using a C-RAN architecture
US Patent No. 9,813,944.

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