5G FAPI specs updated with richer 3GPP feature set
SCF has updated the suite of 5G FAPI specifications which underpin the high-performance low-cost components integral to 5G mobile base stations, whether small cell or macro. This update demonstrates the ongoing commitment of the ecosystem to continually improve the standard, adding new features and maintaining existing ones.FIND OUT MORE
SCF has updated the suite of 5G FAPI specifications which underpin the high-performance low-cost components integral to 5G mobile base stations, whether small cell or macro.
FAPI is a common standard agreed between chipset and component suppliers and mobile base station integrators. It is an API for hardware components implementing 3GPP physical layer functions and “software stacks” implementing higher layers.
FAPI has already been widely adopted in the vast majority of 2G, 3G and 4G system-on-a-chip based small cells and the 5G version is now on its third release.
This update demonstrates the ongoing commitment of the ecosystem to continually improve the standard, adding new features and maintaining existing ones. The update also provides tighter integration between different specs in the suite, enabling greater flexibility and more efficient implementations.
Standardised components will help diversity supply chains and enable a proliferation of RAN providers developing small cell network products for a range of applications for small cells, macro cells, private networks and neutral hosts.
The latest FAPI specifications are the result of intensive cooperation between SCF members from across the ecosystem. They provide common logical interfaces for the main components of a 5G small cell, namely:
Also included on this landing page is S-RU and S-DU Test Support [SCF228]. This paper is not a specification – the specification is derived from 3GPP standards – but aims to educate the reader on how split 6 products can be tested.
This document provides the 5G PHY API specification for an application platform interface (API) between the MAC and PHY protocol layers within the small cell ecosystem. This functional application platform interface (FAPI) is an internal interface within an integrated or disaggregated small cell. The 5G PHY API specification defines a control interface (P5) and a user plane or data path interface (P7). This version is for release 15 of 3GPP specification.Download now
This P19 interface specification serves as a companion to the 5G FAPI P5/P7 specification. Besides enabling the fast, dynamic control of the FEU, one of the primary goals of P19 is to facilitate network virtualization by allowing stack and FEU solutions from different vendors to bind together easily. The concept applies to both the all-in-one small cell solutions where the upper, the lower layers and the FEU are all colocated, as well as the disaggregated solutions where they may reside at different physical locations.Download now
The 5G network functional application platform interface (5G nFAPI) is an initiative that extends for 5G the functional split between the MAC and PHY functions that enables virtualization of the MAC function. This document defines a transportable interface for MAC-PHY 5G function application platform interface (5G-FAPI) defined for 5G small cells [SCF222]. This RAN architecture virtualization MAC function [SCF159] is also known as the Option 6 [3GPP TR 38.816, v15.0.0] architecture split.Download now
The 5G FAPI Network Monitor Mode (NMM) P4 API interface configures and operates network monitoring functions within the capability of the PHY(s). The NMM specification defines the procedures, messages and structures to implement NMM functions for 5G 3GPP release 15 as well as legacy LTE, UTRAN, GERAN, NBIoT. This standalone specification is derived from the legacy Small Cell Forum nFAPI and FAPI Specification [SCF082]. The key updates are updated diagrams and additional 5G messages and structures.Download now
5G nFAPI [SCF225] adds a network transport wrapper around the 5G FAPI PHY API [SCF222] to create the split 6 interface between S-RU and S-DU small cell network units which SCF describes as Open6. This paper is not a specification. It considers how to test the disaggregated units S-RU and S-DU of the RAN.Download now
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