NVIDIA Sionna RT Meets OCUDU: Building Deterministic Digital Twins for 6G and AI-RAN
NVIDIA Sionna, an open-source GPU-accelerated platform for AI-native wireless research, has been integrated with the OCUDU RAN ecosystem via its differentiable ray tracer, Sionna RT. This integration enables a live connection between 3D physical geometry and a functional protocol stack through asynchronous channel streaming using ZeroMQ PUB/SUB. The system employs a GPU-based physics engine for radio wave propagation simulation, transferring data to the CPU for deterministic channel filtering with AVX-512 operations, and supports hot-swapping of channel tap sets without connection interruption. This architecture facilitates site-specific physical realism for applications including AI-driven beamforming and localized LLM fine-tuning in telecom environments.