RSSI (Received Signal Strength Indication) and Interference

In summary, high GSM RSSI can indicate interference, but it can also be caused by other factors such as a strong signal or a malfunctioning phone. It is important to consider where the RSSI is being measured in order to determine the cause.
  • #1
Adil Benmouss
1
0
Hi,

I Want to know: High GSM RSSI mean Interference? the reason behind High RSSI ist only Interference?

Thanks
 
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  • #2
Adil Benmouss said:
Hi,

I Want to know: High GSM RSSI mean Interference? the reason behind High RSSI ist only Interference?

Thanks

Interference or another signal. Where are you seeing this? Here's more info on RSSI:

http://en.wikipedia.org/wiki/Rssi

.
 
  • #3
Adil Benmouss said:
Hi,

I Want to know: High GSM RSSI mean Interference? the reason behind High RSSI ist only Interference?

Thanks

Well, in GSM you have a 200KHz channel in one of the GSM bands, assigned to a user/mobile.
So if you are measuring at the mobile, then whatever enters the 200KHz channel contributes to RSSI - interference, jammer signals, the actual signal that you are supposed to receive, etc.
When you measure RSSI at the Base Station, then you are measuring the whole band-range
that a TRX (Transceiver) board in the BTS handles. This band-range can be Nx200KHz, N being the number of ARFCNs (Absolute RF Channel numbers) the TRX handles. Here again whatever enters the band of the TRX contributes to the RSSI. But a TRX also measures the RSSI in the individual 200KHz band as well (to power-control the mobile correctly).

Long story short -high GSM RSSI does not necessarily mean high interference. If you have
a misbehaving phone that is screaming at the BTS tower, you will still measure high RSSI. If you are a phone too close to the tower, you measure high RSSI!
 

1. What is RSSI and why is it important?

RSSI stands for Received Signal Strength Indication and it is a measurement of the power level of a received radio signal. It is important because it allows us to determine the strength of a signal and how well a device is able to receive it. This is useful in identifying areas with poor signal strength or potential interference.

2. How is RSSI measured?

RSSI is measured in decibels (dB) and is usually represented as a negative number. The closer the value is to 0, the stronger the signal. For example, an RSSI value of -50 dB would indicate a stronger signal than a value of -80 dB.

3. What factors can affect RSSI?

There are several factors that can affect RSSI, including distance from the signal source, physical barriers such as walls or buildings, and interference from other electronic devices. The type of antenna and receiver sensitivity can also impact RSSI values.

4. How does RSSI relate to interference?

RSSI can give us an indication of potential interference because a low RSSI value can suggest that the signal is weak and therefore more susceptible to interference. Additionally, changes in RSSI can also indicate the presence of interference, as it may cause fluctuations in signal strength.

5. Can RSSI be used to identify the source of interference?

RSSI alone cannot identify the specific source of interference, but it can help narrow down the potential sources. By analyzing changes in RSSI values and comparing them to known sources of interference, it is possible to determine the most likely source. Additional testing and analysis may be needed to confirm the source of interference.

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