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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.

Detailed understanding of LTE physical layer involves the understanding of LTE generic frame structure to support FDD and TDD.

TS - Time Slot

LTE frame 1

LTE frame n-1

LTE frame n

Sub Frame 1

Sub Frame 2

Sub Frame 3

Sub Frame 9

Sub Frame 10

TS0

TS1

TS2

TS3

TS17

TS18

TS19

TS20

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

Evolved Packet Core (EPC) system architecture for all IP.Mobility Management Entity (MME),
Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW.
Packet Data Network (PDN) SAE Gateway
Enhanced Packet Data Gateway (ePDG)
Multiple antenna techniques - MIMO, Adaptive antenna systems - AAS and Antenna diversity - AD

LTE topics @ FCD

What is LTE? Key driving factors behind 4G technology.
LTE Data rates and comparison with 3G rates.
Difference between air, radio and core network..  
Seamless mobility in 4G.

Generic Frame Structure to support  both FDD and TDD

The the frame standard supports both FDD and TDD based transmissions. Parameters of this frame structure is below:

Frame Duration = 10 ms or 10/1000000 second.
One Frame has 10 sub-frames.
Sub-frame duration = 1 ms or 1/1000000 second.
One Sub-frame has 2 time slots.
One Time slot = .5 ms or 1/2000000 second.

Next topic - Alternative frame structure only for TDD. (coming soon)

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Each slot can itself contain many OFDM symbols. The difference in number of symbols are dependent on the Cyclic Prefix (CP) length.