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Comments (6)

adejavel avatar adejavel commented on September 27, 2024

Hello, could you please mention where did you find this and for which band ?
Thanks.

from free5gran.

gmg2719 avatar gmg2719 commented on September 27, 2024

Hi, some TDD NR bands, for example TDD N41, N78, N79 get PBCH SCS 30kHz. You can refer to 3GPP specs or follow the following table :

image

from free5gran.

adejavel avatar adejavel commented on September 27, 2024

Yes sure, it is already implemented in the code. My question was where in the code did you find that the SCS is fixed ?
For information, in the current release, we do not implement SS Block patterns. The current statement is that Bands below 3Ghz have a SSB SCS of 15khz and bands above have a SSB SCS of 30khz.

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gmg2719 avatar gmg2719 commented on September 27, 2024

Hi, I just look through part of you code, so I think I was wrong. "The current statement is that Bands below 3Ghz have a SSB SCS of 15khz and bands above have a SSB SCS of 30khz" is the key to unlock my puzzle. I think this may be true at most of the situation. But not always true, my real intention is that bind the SSB SCS property to specific bands may be a future improvement of your code. For these bands with multiple SSB SCS, we should blind detect all of possible situation.
For example,
n5, n41,n66,n90 is below 3GHz, but they can be with SCS =30kHz

image

image

In fact , in my country, SSB SCS of n41 is 30kHz in live network

from free5gran.

adejavel avatar adejavel commented on September 27, 2024

Hello,
Thanks for the feedback! Indeed, the current version do not take into account account that a specific band can have multiple SS Block patterns. It will be part of a future release. For information, the current version distinguishes the SS Block pattern and SSB SCS based on frequency.
If required, you can force SSB SCS by setting band_info variable here to either free5GRAN::BANDWIDTH_15_KHZ for 15khz SCS or free5GRAN::BANDWIDTH_30_KHZ for 30khz SCS.

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gmg2719 avatar gmg2719 commented on September 27, 2024

Thanks, I get it!

from free5gran.

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