5G - Pre Trial - Frame Structure Home : www.sharetechnote.com
As mentioned in Overview page, one of the critical differences in terms of waveform design between 5G Pretrial and current LTE is that in 5G Pre Trial the subcarrier spacing is 75 Khz as opposed to 15 Khz in current LTE. It means Subcarrier spacing of the Pre-Trial is 5 times wider than LTE subcarrier spacing. As a result, the OFDM symbol length of 5G Pre Trial gets 5 times shorter than LTE symbol length. This in turn gives result that the length of one subframe in Pretrial spec gets 5 times shorter than LTE subframe length. However, 5G Pretrial set the length of one Radio Frame to be same as in LTE. It means that in 5G Radio Frame are 5 times more subframes than LTE radio frame.
I know it is confusing :). Let me put these in tabular format.
Both trial specification defines four different subframe structure as follows.
a. Subframe including DL control channel and DL data channel
b. Subframe including DL control channel, DL data channel and UL control channel
c. Subframe including DL control channel and UL data channel
d. Subframe including DL control channel, UL data channel and UL control channel.