What is DwPTS?

– A resource grid is characterized by one subframe in time domain and full carrier bandwidth in the frequency domain . – There are a set of resource grids per transmission direction (uplink or downlink).

A Special subframe has three past DwPTS(Downlink Pilot Time Slot),GP (Guard Period) and UpPTS (Uplink Pilot Time Slot) and all of these have configurable lengths while the sum of the lengths has to be 1 ms or 14 symbols.

Each of sub frame consists of 2 slots , each of which is 0.5 ms in length.

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 .

Bandwidths BandwidthResource BlocksSubcarriers (uplink)3 MHz151805 MHz2530010 MHz5060015 MHz75900LTE Physical Layer Overview – Keysight RFMW Sitemap rfmw.em.keysight.com › helpfiles › webhelp › subsystems › lte › content

DwPTS. The DwPTS is used for downlink synchronization . During the cell search procedure, the UE acquires the timing of the DwPTS by correlating with the SYNC-DL code transmitted in the DwPTS. The UE must identify which SYNC-DL sequence is used out of 32 SYNC-DL possible sequences.

In the downlink, the subcarriers are split into resource blocks. This enables the system to be able to compartmentalise the data across standard numbers of subcarriers . Resource blocks comprise 12 subcarriers, regardless of the overall LTE signal bandwidth. They also cover one slot in the time frame.