Resilient Baseband Processing in Virtualized RANs with Slingshot
Resilient Baseband Processing in Virtualized RANs with Slingshot
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DOI：
10.1145/3603269.3604841
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发表时间：
2023-09
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通讯作者：
N. Lazarev;T. Ji;Anuj Kalia;Daehyeok Kim;Ilias Marinos;Francis Y. Yan;Christina Delimitrou;Zhiru Zhang;Aditya Akella;U. Austin
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作者：
N. Lazarev;T. Ji;Anuj Kalia;Daehyeok Kim;Ilias Marinos;Francis Y. Yan;Christina Delimitrou;Zhiru Zhang;Aditya Akella;U. Austin
在蜂窝网络中，越来越多地采用虚拟无线电接入网络(VRAN)，运营商正在用在商用服务器上运行的软件来取代用于RAN处理的传统专用硬件。目前的vRAN部署缺乏弹性，因为不支持vRAN故障切换或升级，而不会出现长期服务中断。为vRAN启用这些功能具有挑战性，因为它们具有严格的实时延迟要求和黑盒性质。Singshot是一种新系统，它透明地为vRAN最关键的性能层：物理层(PHY)提供弹性。设计了基于快速RAN协议中间盒的实时负载迁移技术和实时RAN故障检测技术。我们设计中的一个关键洞察力是查看从弹性事件到RAN计算状态和I/O的瞬时中断，类似于常规的无线信号损伤，并利用蜂窝网络对这些事件的固有弹性。使用最先进的5G vRAN试验床进行的实验表明，Slingshot处理PHY故障转移时不会中断视频会议，不会中断TCP连接，并且还可以实现零停机升级。
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. Today's vRAN deployments lack resilience, since there is no support for vRAN failover or upgrades without long service interruptions. Enabling these features for vRANs is challenging because of their strict real-time latency requirements and black-box nature. Slingshot is a new system that transparently provides resilience for the vRAN's most performance-critical layer: the physical layer (PHY). We design new techniques for realtime workload migration with fast RAN protocol middle-boxes, and realtime RAN failure detection. A key insight in our design is to view the transient disruptions from resilience events to RAN computation state and I/O similarly to regular wireless signal impairments, and leverage the inherent resilience of cellular networks to these events. Experiments with a state-of-the-art 5G vRAN testbed show that Slingshot handles PHY failover with no disruption to video conferencing, and under 110 ms disruption to a TCP connection, and it also enables zero-downtime upgrades.