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Who Disaggregated My RAN eBook

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radisys.com 33 Radisys Series — Who Disaggregated My RAN? eBook Chapter 8: Orchestrating the Open RAN Symphony We left off in our series having looked at the virtualized and cloud-based open RAN. Now we move on to consider the orchestration part, deploying and managing these cloud-based implementations. Orchestration, or service management and orchestration (SMO), has been used in the enterprise world for some time to manage a number of virtual machines in a public cloud-based implementation in some form or another. Over time, the market has continued to develop specific orchestration products for a variety of vertical industries and has driven a number of innovations. SMOs provide lifecycle management of virtualized network functions (VNFs), such as creating new instances of an application, increasing or decreasing the number of instances to scale to meet the load, managing the multiple instances, and then shutting them down when there is no longer a need. ETSI and Telco Virtualization For telecom, orchestration was originally described and established as a reference architecture in the early specification from the European Telecommunications Standards Institute (ETSI). In 2013, ETSI released the first NFV reference architecture implementations which established how telecom network functions can be implemented in a virtual machine environment and the technical requirements for such deployments. ETSI's NFV reference architecture provided well defined interfaces for these network functions towards virtualization infrastructure and orchestrator as shown in Diagram #1. Diagram 1: Simplified view of orchestrator interfaces in ETSI NFV architecture

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