View Full Version : UL interference in LTE
jbada
2016-05-14, 07:53 AM
Hi Forum
Could you please recommend me some value for UL interference in LTE (Noise and Interference Power on PUSCH)?
As far I know cells with uplink interference are those whose RSSI values are high (higher than -90dBm)
Thank you for your comments
DANORM
2016-05-15, 04:12 PM
Antenna port RSSI= -120+10*log(RB number)
Band(MHz) RSSI(dBm)
1.4 -111
3 -107
5 -105
10 -102
15 -100
20 -99
jbada
2016-05-16, 10:10 AM
Many thanks DANCESTORM for your clarification.
Any recommendation for lowers values like -120dBm.
Thanks
wolverine
2016-05-16, 03:46 PM
Antenna port RSSI= -120+10*log(RB number)
Band(MHz) RSSI(dBm)
1.4 -111
3 -107
5 -105
10 -102
15 -100
20 -99
Hi Dancestorm, interesting. What is the source of this?
Muhammad
2016-05-16, 05:40 PM
Hi Dancestorm, interesting. What is the source of this?
Actually the RSSI should be calculated as
Noise floor (RSSI) = -174 + Noise Figure (Equipment specific) + 10 log (Bandwidth)
In LTE a RB consists of 180kHz so 10 log (180,000) = 52.5 dB
The background noise for one RB = -174 + 52.5 = -121 dBm
Assuming a generic Noise Figure of 3dB, and a bandwidth of 1.4 MHz (6 RB) the RSSI would come
-121 + 3 + 10 log (6) = -118 + 7.7 = -110 ~ -111 dBm
Similarly You can calculate the RSSI value for any given Bandwidth.
Please add reputation if you find this answer as helpful in your query.
rosan
2016-05-19, 07:31 AM
Is there any modification required for this formula when applied to TDD?
rosan
Muhammad
2016-05-20, 08:16 PM
Is there any modification required for this formula when applied to TDD?
rosan
This formula works on the background Noise and bandwidth of signal only.
BR
Jamil
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