LTE Frame Structure

LTE Frame Structure:

• Type 1 - FDD
• Type 2 - TDD

Type 1 LTE Frame Structure

• The basic type 1 LTE frame has an overall length of 10ms
• This radio frame consists of 10 sub-frame, for each 1ms each sub-frame.
• Each sub-frames has 2 slots (total 20 slots)
• Each slot is 0.5ms

Type 2 LTE Frame Structure 

• The 10 ms frame (1 radio frame) comprises two half frames, each 5 ms long. 
• First half-frame is 0 - 4, second half-frame is from 5 - 9.
• Each sub-frames has 2 slots (total 20 slots) wt 0.5ms for each slot.
• The half-frames are further split into five sub-frames, each 1ms long.
• The sub-frames may be divided into standard sub-frames of special sub-frames. The special sub-frames consist of three fields;
  
      DwPTS - Downlink Pilot Time Slot
      GP - Guard Period
      UpPTS - Uplink Pilot Time Stot.

What is the difference between FDD and TDD?

  
FDD

• Different freq. assigned to UL and DL.
• Transmission can happen at the same time.
• More for coverage.
• Easy to deploy & less expensive.
• Very popular among major operator.

 
TDD

• Same frequency for both UL and DL.
• Transmission at different time period.
• More for capacity.
• Difficult to deploy & quite expensive.