The recently proposed open-radio access network (O-RAN) architecture embraces cloudification and network function virtualization techniques to perform the base-band function processing by dis-aggregated radio units (RUs), distributed units (DUs), and centralized units (CUs). This enables the cloud-RAN vision in full, where mobile network operators (MNOs) could install their own RUs, but then lease on-demand computational resources for the processing of DU and CU functions from commonly available open-cloud (O-Cloud) servers via open x-haul interfaces due to variation of load over the day. This creates a multi-tenant scenario where multiple MNOs share networking as well as computational resources. In this paper, we propose a framework that dynamically allocates x-haul and DU/CU resources in a multi-tenant O-RAN ecosystem with min-max fairness. This framework ensures that a maximum number of RUs get sufficient resources while minimizing the OPEX for their MNOs. Moreover, in order to provide an access network architecture capable of sustaining low-latency and high capacity between RUs and edge-computing devices, we consider time-wavelength division multiplexed (TWDM) passive optical network (PON)-based x-haul interfaces where the PON virtualization technique is used to provide a direct optical connection between end-points. This creates a virtual mesh interconnection among all the nodes such that the RUs can be connected to the Edge-Clouds at macro-cell RU locations as well as to the O-Cloud servers at the central office locations. Furthermore, we analyze the system performance with our proposed framework and show that MNOs can operate with a better cost-efficiency than uniform resource allocation.
翻译：最近提议的开放无线电接入网络(O-RAN)架构包含云化和网络功能虚拟化技术,以便通过分散的无线电单位(RUs)、分布式单元(DUs)和中央单位(CUs)来进行基带功能处理。这样可以使云-RAN全视,移动网络操作员(MNOs)可以安装自己的RUs,但然后租赁点点点计算资源,以便从普通的开放式(O-Vial-Loud)服务器中处理DU和CU的功能,通过开放的Xhaul界面服务器(O-Vial-Loud)服务器(O-Loud),通过开放的xhael-Hal-Hal-Law接口进行虚拟化处理。此外,这造成了一种多兆n-MNOs共享网络网络以及计算资源的多度共享。在本文中,动态分配X-haul和Du-DU/C的Oral-ral-ral-ral-ral-al-al-lational-ral-lational-ral-lational-lation-lational-lation-lation-lation-lation-lock-lock-lock-us-us-us-us-lock-lation-O-O-l-O-l-l-l-l-lation-l-l-l-lup-lup-O-l-l-l-l-lation-lation-O-l-l-l-l-lation-lation-lation-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-O-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l-l
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