【威尼斯人】：
This document describes an Application Programming Interface (API) which defines the interface between LTE L2/L3 software and L1 PHY. Specifically, this L1 API defines both P5 and P7 of the Femto Forum LTE FAPI.
The LTE standard [3] has been designed to support both TDD and FDD deployments. The LTE L1 API, described in this document, also supports TDD and FDD modes. Features which are specific to only TDD, or FDD, are clearly highlighted.
This document is divided into two sections. The first section provides a description of typical procedures which will occur between the L1 and L2/L3 software. The second section provides the definition of the L1 API messages.
