9 papers
A Lifecycle and Application-Stack Survey of Large Language Model Vulnerabilities: Attacks, Risks, Defenses, and Open Problems
Seyed Bagher Hashemi Natanzi, Bo Tang
Large language models are no longer only text generators. They are increasingly embedded in retrieval pipelines, enterprise assistants, coding environments, robotic systems, securi…
Advanced AI Service Provisioning in O-RAN through LLM Engine Integration
Seyed Bagher Hashemi Natanzi, Pranshav Gajjar, Bo Tang +1
The Open Radio Access Network (O-RAN) architecture allows AI to be embedded directly into the RAN through modular xApps and rApps, yet creating these applications collecting data,…
SliceFed: Federated Constrained Multi-Agent DRL for Dynamic Spectrum Slicing in 6G
Hossein Mohammadi, Seyed Bagher Hashemi Natanzi, Ramak Nassiri +3
Dynamic spectrum slicing is a critical enabler for 6G Radio Access Networks (RANs), allowing the coexistence of heterogeneous services. However, optimizing resource allocation in d…
AI-Driven Fuzzing for Vulnerability Assessment of 5G Traffic Steering Algorithms
Seyed Bagher Hashemi Natanzi, Hossein Mohammadi, Bo Tang +1
Traffic Steering (TS) dynamically allocates user traffic across cells to enhance Quality of Experience (QoE), load balance, and spectrum efficiency in 5G networks. However, TS algo…
FairShare: Auditable Geographic Fairness for Multi-Operator LEO Spectrum Sharing
Seyed Bagher Hashemi Natanzi, Hossein Mohammadi, Vuk Marojevic +1
Dynamic spectrum sharing (DSS) among multi-operator low Earth orbit (LEO) mega-constellations is essential for coexistence, yet prevailing policies focus almost exclusively on inte…
Secure mmWave Beamforming with Proactive-ISAC Defense Against Beam-Stealing Attacks
Seyed Bagher Hashemi Natanzi, Hossein Mohammadi, Bo Tang +1
Millimeter-wave (mmWave) communication systems face increasing susceptibility to advanced beam-stealing attacks, posing a significant physical layer security threat. This paper int…
Mobile Jamming Mitigation in 5G Networks: A MUSIC-Based Adaptive Beamforming Approach
Olivia Holguin, Rachel Donati, Seyed bagher Hashemi Natanzi +1
Mobile jammers pose a critical threat to 5G networks, particularly in military communications. We propose an intelligent anti-jamming framework that integrates Multiple Signal Clas…
Online Learning-based Adaptive Beam Switching for 6G Networks: Enhancing Efficiency and Resilience
Seyed Bagher Hashemi Natanzi, Zhicong Zhu, Bo Tang
Adaptive beam switching is essential for mission-critical military and commercial 6G networks but faces major challenges from high carrier frequencies, user mobility, and frequent…
RANFusion: A Comprehensive Tool for Simulating Handover In Next-G RAN
Seyed Bagher Hashemi Natanzi, Bo Tang
The rapid advancement of 5G networks and the upcoming transition to 6G necessitate the use of the Open Radio Access Network (O-RAN) architecture to enable greater flexibility, inte…