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Old 11-07-2019, 9:18 AM
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Small Cell Forum Publishes Specification to Drive Unified 5G Open RAN

5G FAPI Release provides common APIs to support interoperability between 5G small cell hardware components and software layers enabling interoperability and preventing fragmentation

London, UK – 11th July 2019 Small Cell Forum (SCF), the telecoms organization making mobile infrastructure solutions available to all, has today published the PHY API for 5G to stimulate a competitive ecosystem for vendors of 5G small cell hardware, software and equipment. The PHY API provides an open and interoperable interface between the physical layer and the MAC layer. 3G and LTE versions are already used in most small cells today.

The specification has been developed through a successful collaboration of companies from across the small cell eco-system, including; Intel, Qualcomm Technologies, Inc., Airspan and Picocom.

5G FAPI is an initiative within the small cell industry to encourage competition and innovation among suppliers of platform hardware, platform software and application software by providing a common API around which suppliers of each component can compete. By doing this, SCF provides an interchangeability of parts ensuring that the system vendors can take advantage of the latest innovations in silicon and software with minimum barriers to entry, and the least amount of custom re-engineering.

Operators are looking for a radically different cost model for 5G networks, one that relies on interoperability and an open, competitive ecosystem. As networks are disaggregated, a critical interface is the fronthaul between a distributed unit (DU) for radio functions and a centralised unit (CU) for protocol stacks and baseband functions. Open specifications such as SCF’s FAPI will enable operators to mix and match protocol stacks, basebands and radios from different vendors, and realize the benefits of deploying disaggregated, virtualized RAN (vRAN) networks.

“The economic success of 5G is reliant on interoperable multivendor networks, which require open interfaces at both silicon and network level,” said David Orloff, Chair of Small Cell Forum. “These uniform specifications for equipment and interfaces will enable limitless flexibility in how cells are deployed and which form factors and suppliers are included. Specifications such as 5G FAPI are key to accelerating the progress towards fully deployable, commercially viable dense 5G networks.”

The Forum also maintains the widely adopted FAPI specifications for 3G and LTE, as well as networked FAPI (nFAPI) for LTE supporting a MAC/PHY functional split, a key enabler for virtualisation of higher layer base station functions. In 5G this split point was also identified by 3GPP and called split option 6.

The Forum’s motivation for defining nFAPI in LTE was to establish a scalable ecosystem with a converged approach to virtualization across multiple suppliers, and the continued adoption of NFV/SDN make this is even more crucial for 5G. As such, the Forum plans to expand 5G FAPI to operate across split option 6 as 5G nFAPI.
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