Can we switch from DL to UL without any special slot?

sghoslya · December 10, 2020, 3:00am

Hi,
In NR can we have 4DL-1UL without special slot with 5 slot periodicity?
I mean can we switch from DL to UL without any special slot?

Nitin · March 10, 2021, 11:13am

I think some guard period should be present.

Hainm · March 10, 2021, 11:14am

4-1 is: dddsu, s is both dl & ul + gap.

sghoslya · March 10, 2021, 11:15am

Thanks @Hainm, any reference from spec?

Hainm · March 10, 2021, 4:01pm

As 3GPP 38.104, transmitter off period should be >= 70/N ( N= SCS/15) micro second
For SCS 30Khz, N =2, off period >= 35us
each symbol is: 0.5ms/14 ~ 35us, so 2 ‘S’ symbol is OK.

Wu_Miranda · April 18, 2024, 2:23am

Hi @Hainm ,

Thanks.
I’m inspired by your response.
Do you think if only 1 symbol between DL to UL in S slot will be too risky?

Hainm · April 18, 2024, 2:45am

1 symbol is too short. RRU can not implement on/off transmission within 1 SYM.