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| 2023—present: Assistant Professor of Computer Science, University of Texas at Austin 2019—2023: Senior Researcher, Microsoft Research 2021: PhD in Computer Science, Carnegie Mellon University Daehyeok Kim is an assistant professor of computer science at the University of Texas in Austin. Before joining UT Austin, he was a senior researcher at Microsoft Research Redmond and Azure for Operators group. He received his PhD from the Computer Science Department at Carnegie Mellon University. His research interests lie at the intersection of systems and networking, focusing on building software systems that improve the performance, efficiency, and resilience of data- and network-intensive applications running on emerging programmable infrastructures. He is a recipient of the Microsoft Research PhD Fellowship. |
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| In cellular networks, there is a growing adoption of virtualized radio access networks (vRANs), where operators are replacing the traditional specialized hardware for RAN processing with software running on commodity servers. While vRANs could bring many benefits, such as increased feature velocity, a larger vendor ecosystem, and reduced CapEx/OpEx, today’s vRAN deployments lack resilience since there is no support for vRAN failover or upgrades without long service interruptions. We observe that enabling resilience in vRANs is challenging due to their real-time deadlines and black-box nature. In this talk, I demonstrate that we can make vRAN resilient without modifying the vRAN software stack by effectively repurposing inherent cellular mechanisms for wireless resilience and designing performant and resource-efficient software shim layers. I first introduce Slingshot, a system that provides resilience to the vRAN’s performance-critical “physical layer” (PHY), by viewing transient disruptions from resilience events akin to regular wireless signal impairments and exploiting the inherent resilience of cellular networks to these events. I then present Atlas, a system that enables the resilience of the vRAN’s “distributed unit” (PHY + medium access control + radio link control layers) by repurposing existing cellular resilience mechanisms, such as handovers and cell reselection, transforming them into effective tools to enable DU resilience. Slingshot and Atlas have been implemented and evaluated on a production-grade 5G vRAN testbed with commercial user equipment. |
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