What is a subframe in LTE?

Each radio frame is Tf = 307200⋅Ts =10ms long and consists of 20 slots of lengthTslot = 15360⋅Ts = 0.5 ms , numbered from 0 to 19. A subframe is defined as two consecutive slots where subframe i consists of slots 2i and 2i +1 . The 10 subframes within a radio frame are available for downlink transmissions.

How does LTE TDD work?

TDD technology uses a single channel and a timed signal to separate uploads and downloads. FDD systems have two channels of paired spectrum separated with a guard band for uploads and downloads. Advocates of TDD technology suggest that the single channel makes the network more bandwidth-efficient.

How many slots does LTE subframe have?

two slots
The basic type 1 LTE frame has an overall length of 10 ms. This is then divided into a total of 20 individual slots. LTE Subframes then consist of two slots – in other words there are ten LTE subframes within a frame.

What are the different configurations of LTE TDD frames?

There are seven possible configurations for LTE TDD frame as shown below. Here D- is downlink, S- for Special subframe and U- for Uplink. As shown 5 ms periodicity frame have two “S” subframe and 10 mili sec frames have only one “S” subframe. Special subframe has 9 different configurations.

What are the frame and subframe structures for LTE?

LTE Frame and Subframe Structure 1 Type 1 LTE Frame Structure. The basic type 1 LTE frame has an overall length of 10 ms. 2 Type 2 LTE Frame Structure. The frame structure for the type 2 frames used on LTE TDD is somewhat different. 3 LTE TDD / TD-LTE subframe allocations. 4 For Further Information

How many subframes are in a TDD frame?

A TDD frame structure is shown in below figure. 10 mili second radio frame consists of Downlink subframe, Uplink subframe and Special subframe. In TDD there are about 7 frame configurations, based on different DL/UL partition. Downlink/Uplink ratio can vary from 1/3 (Frame configuration = 0) to 8/1 (Frame configuration = 1).

How many slots are in a type 1 LTE frame?

The basic type 1 LTE frame has an overall length of 10 ms. This is then divided into a total of 20 individual slots. LTE Subframes then consist of two slots – in other words there are ten LTE subframes within a frame.