# LTE signal quality (RSRP, RSRQ, SINR)

> 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.

- Also known as: RSRP, RSRQ, SINR, Reference Signal Received Power, Reference Signal Received Quality, Signal-to-interference-plus-noise ratio, LTE signal strength
- Last reviewed: October 12, 2026

## 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](https://dataremote.com/accessories/ant-ext) 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](https://dataremote.com/newsroom/definitions/dual-sim-failover)
  can switch to a second carrier when one network is weak.

## Why it matters for POTS replacement

A [cellular gateway](https://dataremote.com/newsroom/definitions/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](https://dataremote.com/ara), and through the [DataRemote MCP](https://dataremote.com/ara/mcp), which bands each reading by quality
and reports any value a device did not send as unknown rather than zero.

## Common misconceptions

**Claim:** Signal bars tell you how good the connection is.

**Correction:** 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.

**Claim:** There is an official good/bad threshold for each measurement.

**Correction:** 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.

**Claim:** More power always fixes a weak site.

**Correction:** 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

**What is a good RSRP?**

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.

**What is the difference between RSRP and RSSI?**

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.

**How can I check signal quality on a DataRemote device?**

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.

**Will an external antenna improve signal 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.

## Sources

- [TS 36.214: Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer; Measurements](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=2428) — 3GPP


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Canonical page: https://dataremote.com/newsroom/definitions/lte-signal-quality
Organization: DataRemote, Inc. — POTS line replacement, cellular failover, and fixed wireless access solutions. https://dataremote.com