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If the subcarrier spacing (SCS) of a low-frequency cell Is 30 kHz and the bandwidth of each RB Is 360 kHz, theoretically, what value should the noise (dBm) over the air interface be?
Suggested Answer: B
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The theoretically noise (dBm) over the air interface should be -116 dBm. The noise is calculated by subtracting the noise figure of the receiver from the thermal noise floor, which is determined by the subcarrier spacing and the bandwidth of each Resource Block (RB). In this case, the subcarrier spacing is 30 kHz and the bandwidth of each RB is 360 kHz, so the thermal noise floor is -116 dBm.
13 comments · newest first
CH
Chantell
12 months ago
I agree with -116 dBm, makes sense with the SCS and RB bandwidth!
YV
Yvonne
12 months ago
Wait, how can it be -97 dBm? That sounds off.
EL
Elke
1 year ago
Not sure about that, -105 dBm seems too high for low-frequency.
CA
Carissa
1 year ago
Definitely -120 dBm, that’s what I calculated too!
MA
Maurine
1 year ago
I think the noise should be around -116 dBm.
AN
Anastacia
1 year ago
I vaguely remember that lower frequencies might have different noise characteristics. I’m tempted to choose -116 dBm, but I need to double-check my notes.
KE
Keith
1 year ago
I feel like the noise level should be around -120 dBm, but I can't recall the exact formula we used in class.
HI
Hildred
1 year ago
I think we practiced a similar question where we had to calculate noise levels. I might lean towards option B, but I’m not completely confident.
CH
Cherrie
1 year ago
I remember something about calculating noise based on bandwidth and subcarrier spacing, but I'm not sure how to apply it here.
CO
Corazon
1 year ago
I'm a bit confused on this one. I know we can recreate the view, but that seems like a lot of work if we just need to change a few columns. Is there a more efficient way to update the view definition?
PA
Paul
1 year ago
I'm leaning towards option C - multiple Regional Cloud Storage buckets, one per zone per region. That should provide good latency while still being cost-effective.
BE
Beula
1 year ago
Hmm, this is a tricky one. I'll need to think carefully about the permissions and ownership for the /etc/passwd file.
NA
Natalie
1 year ago
I'm pretty sure the Tl-LFA only applies to the instance and makes the interfaces inherit the configuration, not the entire OSPF network. But I'll double-check my notes to be sure.