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Learn about energy efficiency optimization techniques for 5G virtualized radio access network (vRAN) servers in this 17-minute conference presentation from NSDI '25. Explore the unique challenges of improving CPU energy management in vRAN environments, where strict real-time sub-millisecond deadlines and proprietary black-box software prevent the use of conventional energy management approaches. Discover RENC, a novel system that reduces energy consumption by dynamically adjusting CPU frequency in response to sub-second variations in cellular workloads through three key innovations: establishing safe low-load intervals by coupling Media Access Control (MAC) layer rate limiting with CPU frequency changes, computing safe CPU frequencies using Linux eBPF hooks and binary rewriting techniques to measure deadline slack in vRAN threads, and handling CPU load spikes from control operations like new user attachments. Examine the evaluation results from a state-of-the-art vRAN testbed demonstrating up to 45% reduction in CPU power consumption and 29% server-wide power savings, presented by researchers from Microsoft, MIT, University of Edinburgh, Microsoft Research, and UIUC.
