What is a LTE physical (PHY) layer and generic frame structure for FDD and TDD

The LTE Physical layer is the first and lowest layer of computing operating system. This is often termed as the LTE PHY layer. Fundamental operation of this layer is to support hardware implementation of LTE standard. This layer only handles bit streams and the logical nature of packets are irrelevant. In LTE the bits are stored into symbols and slots and transmitted through frames over the RF link.