What is subframe LTE?
In LTE, DL and UL transmissions are organized into radio frames of 10 ms each. Each frame is divided into ten equally sized subframes. The duration of each subframe is 1 ms. Moreover, each subframe is further divided into two equally sized time slots, that is, each slot is 0.5 ms.
What is TDD configuration?
3-5/6/7 is not supported for TDD UL/DL configuration 5….
| Features | FDD | TDD |
|---|---|---|
| HARQ Timing | K = 4 (fixed) DL : Async, UL :Sync | K = varying depending on Subframe Config DL : Async, UL : Sync |
| Ack/Nack Feedback Mode | One Transmission one Ack/Nack | Bundling or Multiplexed |
| SR/DCI 0 Timing | 4 ms | Varying |
| DCI 0/PUSCH Timing | 4 ms | Varying |
What is the difference between the LTE FDD and TDD frame structures?
Let us understand LTE FDD and TDD LTE versions with figures and band example below. LTE has radio frame of duration 10ms consisting of 10 subframes. Each subframe has two slots. The slot is of 0.5ms duration….TDD LTE.
| Feature | LTE FDD | TDD LTE |
|---|---|---|
| Frame structure | Uses FDD frame structure | Uses TDD frame structure, READ MORE |
What is TDD in LTE?
Time-division duplexing (TDD) is a communication method where both the transmitter and receiver use the same frequency band but transmit and receive traffic at different times. Frequency Division Duplexing (FDD) is a full-duplex method that uses two different frequencies for transmit and receive operations. Parameter.
What is TDD subframe?
In TDD, the transmission is divided into time domain, means at one moment of time either downlink subframe is transmitted or uplink. As one can see in above image, one frame is divided into 10 subframes (1ms each), and that subframe can be either downlink, uplink or special subframe.
What is special subframe in TDD?
Special subframe Details TDD duplex mode needs to switch transmission from Downlink to Uplink and Uplink to Downlink, hence Special subframe is required for switching the transmission from Downlink to Uplink. In TDD, there are two periodicity frame one with 5ms periodicity and another with 10 ms periodicity.
Which is faster TDD or FDD?
Theoretical peak throughput in case of FDD is clearly better than TDD. TDD has less capacity to accommodate user data and traffic in radio frame compared to FDD.
How many HARQ process in LTE TDD?
There are 8 uplink HARQ processes running on both UE and eNB with 4 processes delay. HARQ process length is same as a subframe (1 ms). When UE sends data to eNB, eNB decodes data and checks CRC. eNB then sends acknowledgement (ACK) or not-acknowledged (NACK) to UE after 4 subframes.
What are the special Subframe configuration in TDD?
In TDD , there are 9 special subframe configuration, each have different number of OFDM symbols for DwPTS,GP and UpPTS. Special subframe guard period impact the size of cell, it represent how much propagation delay it can compensate.
What is the frame configuration for LTE TDD?
LTE TDD Frame Configuration These first three groups of settings apply to all basic carriers. The Fading parameters are available for Advanced LTE and Advanced LTE-A TDD carriers only. Some parameters do not apply to the Basic LTE PRACH and Basic LTE-A PRACH.
How many subframes are there in an LTE frame?
There are total 10 subframes in a frame. Each subframe composed of 2 time slots. Type 1 is used as LTE FDD frame structure. As shown in the figure below, an LTE TDD frame is made of total 20 slots, each of 0.5ms. Two consecutive time slots will form one subframe. 10 such subframes form one radio frame.
What is the frame structure for TDD?
The frame structure below ( Figure 1) is applicable to TDD. Each radio frame of length Tf = 307200*Ts = 10 ms consists of two half-frames of length Tf = 153600*Ts = 5 ms each. Each half-frame consists of five subframes of length 307200*Ts = 1 ms.