15 kHz SCS in 5G NR DSS

5G NR
,
1

Hi all.
Is only 15 kHz SCS allowed for NR in DSS?

DSS: Dynamic Spectrum Sharing.

1 Like
2

Why FDD almost always use 15 kHz SCS?
I can see we can use 30 kHz as well for FDD.

3

FDD mostly will be used in coexistence with LTE (DSS).
Hence mostly 15 kHz will be used.
Nokia only use and support 15 kHz in FDD.

4

Thanks.
I can see for FDD bands as per specs table we can use 15, 30, 60 kHz as well.

5

Yes I saw Samsung DSS also using 30 kHz.

I think specs talk about FR1 or FR2 , they didn’t say FDD/TDD.
Right?

6

Compatibility with LTE pushes for 15kHz use.

Mid bands, until 2600, prefer/only have support for 15kHz.

High bands, such as n78, are commonly used with 30kHz.

3GPP provides way to implement, but not necessarily all vendors will support

7

SCS is determined by cell BW.
Higher cell BW, higher SCS.
And also depend on ifft size.

For example, NR cell 100 MHz, SCS 30 kHz, 273 RB, 3276 sub-carriers.
If SCS 60 kHz, 1632 sub-carrier.
NR ifft samples 4096, it is ok.
If SCS 15 kHz, sub-carrier > 6500, not enough sampling, so cell 100 MHz not has SCS 15.