A Comprehensive Overview and Survey of O-RAN: Exploring Slicing-aware Architecture, Deployment Options, and Use Cases
arxiv(2024)
摘要
Open-radio access network (O-RAN) seeks to establish principles of openness,
programmability, automation, intelligence, and hardware-software disaggregation
with interoperable interfaces. It advocates for multi-vendorism and
multi-stakeholderism within a cloudified and virtualized wireless
infrastructure, aimed at enhancing the deployment, operation, and maintenance
of RAN architecture. This enhancement promises increased flexibility,
performance optimization, service innovation, energy efficiency, and cost
efficiency in fifth-generation (5G), sixth-generation (6G), and future
networks. One of the key features of the O-RAN architecture is its support for
network slicing, which entails interaction with other slicing domains within a
mobile network, notably the transport network (TN) domain and the core network
(CN) domain, to realize end-to-end (E2E) network slicing. The study of this
feature requires exploring the stances and contributions of diverse standards
development organizations (SDOs). In this context, we note that despite the
ongoing industrial deployments and standardization efforts, the research and
standardization communities have yet to comprehensively address network slicing
in O-RAN. To address this gap, this survey paper provides a comprehensive
exploration of network slicing in O-RAN through an in-depth review of
specification documents from O-RAN Alliance and research papers from leading
industry and academic institutions. The paper commences with an overview of the
ongoing standardization efforts and open-source contributions associated with
O-RAN, subsequently delving into the latest O-RAN architecture with an emphasis
on its slicing aspects. Further, the paper explores deployment scenarios for
network slicing within O-RAN, examining options for the deployment and
orchestration of O-RAN and TN network slice subnets...
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