Definition
LTE signal quality (RSRP, RSRQ, SINR)
Also known as: RSRP, RSRQ, SINR, Reference Signal Received Power, Reference Signal Received Quality, Signal-to-interference-plus-noise ratio, LTE signal strength
LTE signal quality is described by three measurements: RSRP (Reference Signal Received Power), how strong the serving cell's signal is; RSRQ (Reference Signal Received Quality), how clean that signal is relative to everything else received; and SINR (signal-to-interference-plus-noise ratio), how far the usable signal stands above interference and noise.
How it works
An LTE cell transmits reference signals on known resource elements. RSRP is the average power of those reference signals as received, in dBm — reported roughly between −44 dBm (very strong) and −140 dBm (very weak). RSRQ compares RSRP with the total received power across the channel, in dB — typically between about −3 dB and −20 dB — so it falls when neighbouring cells or noise crowd the channel. SINR, in dB, is the ratio of wanted signal to interference plus noise; the modem calculates it, so values are most comparable on the same hardware.
Why it matters
A cellular POTS replacement appliance carries voice, fax and alarm signals over its LTE or 5G link. Those signals are less forgiving than web browsing: a marginal link that still loads pages can garble DTMF tones or delay alarm reports. Checking all three measurements at install — and watching them afterwards — is how a weak site is found before it fails an inspection.
Common use cases
- Choosing a mounting location during a site survey
- Deciding whether a site needs an external antenna
- Troubleshooting dropped calls or delayed alarm signals
- Spotting fleet-wide signal problems after a carrier network change
The three measurements answer three different questions: how loud is the cell (RSRP), how crowded is the channel (RSRQ), and how much of what arrives is usable (SINR). A healthy link needs all three.
Common rule-of-thumb bands
These ranges are widely used in the field. They are not defined by 3GPP, and carriers and equipment makers set their own thresholds, so treat them as a starting point.
| Measurement | Excellent | Good | Fair | Poor |
|---|---|---|---|---|
| RSRP (dBm) | −80 or better | −80 to −90 | −90 to −100 | below −100 |
| RSRQ (dB) | −10 or better | −10 to −15 | −15 to −20 | below −20 |
| SINR (dB) | 20 or better | 13 to 20 | 0 to 13 | below 0 |
Reading the three together
- Good RSRP, poor SINR — the cell is strong but the channel is noisy, often from neighbouring cells. Re-aiming or relocating usually beats adding gain.
- Poor RSRP, good SINR — the signal is clean but faint. Distance or obstruction is the likely cause, and an external antenna placed higher or outside often helps.
- Poor across the board — the site may need a different carrier, a different mounting location, or both. Appliances with dual-SIM failover can switch to a second carrier when one network is weak.
Why it matters for POTS replacement
A cellular gateway replacing a copper line carries traffic that older analog equipment was never designed to tolerate degrading: DTMF digits, fax tones, alarm-panel reporting formats. Signal that is adequate for data can still be marginal for those. That is why DataRemote reports all three measurements — in Ara, and through the DataRemote MCP, which bands each reading by quality and reports any value a device did not send as unknown rather than zero.
Common misconceptions
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“Signal bars tell you how good the connection is.”
Bars are usually derived from signal strength alone. A site can show full bars — strong RSRP — and still perform badly if RSRQ and SINR are poor because of interference from neighbouring cells.
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“There is an official good/bad threshold for each measurement.”
3GPP defines how RSRP and RSRQ are measured, not what counts as good. The bands below are common rules of thumb; carriers and equipment makers draw the lines differently.
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“More power always fixes a weak site.”
Raising RSRP helps only when the problem is distance or obstruction. When SINR is low because of interference, relocating or re-aiming an antenna toward a cleaner cell often helps more than adding gain.
Frequently asked questions
As a common rule of thumb, −80 dBm or better is excellent, −80 to −90 dBm good, −90 to −100 dBm fair, and below −100 dBm poor. For voice and alarm traffic, read RSRP together with RSRQ and SINR, and follow the carrier's and the equipment maker's guidance.
RSRP measures only the serving cell's reference signals. RSSI measures all power received in the channel — the wanted signal plus interference and noise. RSRQ is derived from the two, which is why it reveals interference that RSRP alone hides.
In Ara, DataRemote's device management platform, or by asking an AI assistant connected through the DataRemote MCP, which reports RSRP, RSRQ and SINR banded by quality.
Often, when the appliance sits in a basement, a metal enclosure or behind concrete. An external antenna moves reception to where the signal is stronger and cleaner, such as a rooftop or the top of an enclosure.
Related to this term
Also referenced
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