Published October 25, 2021 | Version v1
Preprint Open

Nuberu: Reliable RAN Virtualization in Shared Platforms

  • 1. i2CAT Foundation
  • 2. NEC Laboratories Europe
  • 3. Universidad Carlos III de Madrid
  • 4. NEC Laboratories Europe, i2CAT Foundation & ICREA
  • 5. Universidad Carlos III de Madrid & IMDEA Networks Institute


RAN virtualization will become a key technology for the last mile of next-generation mobile networks driven by initiatives such as the O-RAN alliance. However, due to the computing fluctuations inherent to wireless dynamics and resource contention in shared computing infrastructure, the price to migrate from dedicated to shared platforms may be too high. Indeed, we show in this paper that the baseline architecture of a base station¿s distributed unit (DU) collapses upon moments of deficit in computing capacity. Recent solutions to accelerate some signal processing tasks certainly help but do not tackle the core problem: a DU pipeline that requires predictable computing to provide carrier-grade reliability. We present Nuberu, a novel pipeline architecture for 4G/5G DUs specifically engineered for non-deterministic computing platforms. Our design has one key objective to attain reliability: to guarantee a minimum set of signals that preserve synchronization between the DU and its users during computing capacity shortages and, provided this, maximize network throughput. To this end, we use techniques such as tight deadline control, jitter-absorbing buffers, predictive HARQ, and congestion control. Using an experimental prototype, we show that Nuberu attains >95% of the theoretical spectrum efficiency in hostile environments, where state-of-art approaches lose connectivity, and at least 80% resource savings


This work has been supported by the European Commission through Grant No. 101017109 (DAEMON project) and Grant No. 101015956 (Hexa-X project), and the CERCA Programme/Generalitat de Catalunya.



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Conference paper: 10.1145/3447993.3483266 (DOI)


Hexa-X – A flagship for B5G/6G vision and intelligent fabric of technology enablers connecting human, physical, and digital worlds 101015956
European Commission
DAEMON – Network intelligence for aDAptive and sElf-Learning MObile Networks 101017109
European Commission