What is special subframe in TDD?
What is special subframe 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. Longer guard period can compensate more propagation delay result a longer cell size.
What is frame and subframe in 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.
How many symbols are there in LTE subframe?
A typical LTE frame is 10 ms (milliseconds) long. Each LTE frame has 10 sub-frames (1 ms each) while each sub-frame is further divided into 2 slots (0.5 ms each). The slots are divided into symbols – each slot has either 6 or 7 symbols. The number of symbols per slot depends on the size of the cyclic prefix.
How many slots does LTE subframe have?
2 slots
Each of sub frame consists of 2 slots, each of which is 0.5 ms in length.
Is 5G TDD or FDD?
In FDD mode, both uplink and downlink can transmit at the same time at different spectrum frequencies. In TDD mode, both uplink and downlink use the same spectrum frequencies but at different times….5G TDD.
| Feature | 5G FDD | 5G TDD |
|---|---|---|
| Interference with neighboring Base Stations | Less | More |
What is LTE TDD and FDD?
Nevertheless, TDD LTE (also known as TD LTE) stands for Time Division Duplexing-Long Term Evolution. FDD LTE stands for Frequency-Division Duplexing LTE. Both TDD and FDD differ in the way they treat data. TDD means the “receive” and “transmit” channels divide the time between them on the same frequency band.
What is LTE TDD technology?
What is subcarrier spacing in LTE?
In addition to this the subcarriers spacing is 15 kHz, i.e. the LTE subcarriers are spaced 15 kHz apart from each other. Each subcarrier is able to carry data at a maximum rate of 15 ksps (kilosymbols per second). This gives a 20 MHz bandwidth system a raw symbol rate of 18 Msps.
How does LTE calculate PRB?
Physical Resource Block (PRB) = 2*Resource Block = 12 Subcarriers x 14 OFDM in 1ms. RE can deliver 2, 4, 6, 8 bits in QPSK, 16QAM, 64QAM, 256QAM respectively. If we calculate for 64QAM as 6bits since 256QAM not widely spread (check Samsung S7 in T-Mobile). 20MHz ==> 100 PRB ==> 100*168*1000 = 16,800,000 RE in 1 s.
What is the best TDD or FDD?
In general, FDD is considered better for coverage, while TDD is better for capacity.
What is the structure of a LTE TDD frame?
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. One subframe duration is about 1 ms. Hence LTE radio frame will have duration of about 10ms. Each radio frame will have 307200 Ts.
Why are there 9 special subframes 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. Longer guard period can compensate more propagation delay result a longer cell size.
How many subframes are in a LTE frame?
Total Frame duration is about 10ms. There are total 10 subframes in a frame. Each subframe composed of 2 time slots. Type 1 is used as LTE FDD frame structure.
Where is SS in the LTE frame structure?
For the 5ms DL to UL switch point periodicity case, SS (Special subframe ) exists in both the half frames. For the 10ms DL to UL switch point periodicity case, SS exists only in first half frame. The table mentions DL and UL configuration which determines the contents of the subframes in LTE frame structure.