RSRP, RSRQ, SINR: complete field guide for RF engineers
Practical guide to understanding and interpreting RSRP, RSRQ, and SINR on LTE and 5G NR networks. Reference values, indicator correlation, and common interpretation errors.
RSRP, RSRQ, and SINR are the three pillars of mobile radio measurement. Their combined interpretation enables the diagnosis of most coverage, interference, and performance issues. This field guide presents reference values, correlations between indicators, and the most common interpretation errors.
RSRP: the coverage indicator
Definition
RSRP (Reference Signal Received Power) measures the average power of the Resource Elements carrying reference signals (CRS in LTE, SSB in 5G NR), in dBm.
In LTE: RSRP is measured on the Reference Symbols (CRS) distributed across the bandwidth. In 5G NR: SS-RSRP is measured on the SSBs (Synchronization Signal Blocks), which are directional (beamformed).
LTE RSRP reference values
| RSRP (dBm) | Quality | Field description |
|---|---|---|
| > -70 | Excellent | Close to an antenna, very strong signal |
| -70 to -85 | Good | Adequate indoor coverage, optimal performance |
| -85 to -95 | Fair | Average performance, acceptable for most services |
| -95 to -105 | Weak | Cell edge, degraded performance, handover likely |
| -105 to -115 | Very weak | Low coverage zone, risk of disconnection |
| < -115 | Critical | Out of coverage or insufficient coverage |
5G NR RSRP reference values (Sub-6 GHz)
5G NR sub-6 GHz thresholds are broadly similar to LTE, with a slight offset due to antenna technology differences (beamforming vs. omnidirectional).
For mmWave bands (FR2: 24-52 GHz):
- RSRP > -85 dBm: necessary for adequate performance
- RSRP < -100 dBm: severely degraded performance in mmWave
What RSRP does not tell you
RSRP is a raw coverage indicator. It does not tell you whether the signal is usable β an RSRP of -80 dBm in a pilot pollution zone can deliver worse performance than an RSRP of -100 dBm in a zone with a single dominant cell. This is where RSRQ and SINR come into play.
RSRQ: the relative quality indicator
Definition
RSRQ (Reference Signal Received Quality) combines RSRP and RSSI (total received signal level from all sources):
RSRQ = N x (RSRP / RSSI)
Where N is the number of Resource Blocks in the band. RSRQ is measured in dB.
In practice, RSRQ decreases when:
- The serving cell has a weak signal (low RSRP)
- Neighbor cells have a strong signal (increased RSSI)
LTE RSRQ reference values
| RSRQ (dB) | Quality |
|---|---|
| > -10 | Excellent |
| -10 to -15 | Good |
| -15 to -20 | Degraded |
| < -20 | Severely degraded |
RSRQ role in handovers
RSRQ is one of the handover triggers in LTE networks (events A2, A5). An RSRQ below the A2 threshold triggers neighbor cell measurements. Understanding the RSRQ thresholds configured in the network enables interpretation of the MeasurementReport messages captured during a drive test.
Note: RSRQ is sometimes misconfigured in certain equipment and can display inconsistent values. In such cases, SINR is a more reliable indicator.
SINR: the real performance indicator
Definition
SINR (Signal to Interference plus Noise Ratio) measures the ratio of the useful signal to noise and interference, in dB. It is the most direct performance indicator for predicting throughput and quality of service.
LTE/5G NR SINR reference values
| SINR (dB) | Modulation | Relative DL throughput |
|---|---|---|
| > 25 | 256QAM (5/6) | ~ 100% |
| 20-25 | 64QAM (4/5) | ~ 80-100% |
| 15-20 | 64QAM (3/4) | ~ 60-80% |
| 10-15 | 16QAM | ~ 40-60% |
| 5-10 | QPSK (high) | ~ 20-40% |
| 0-5 | QPSK (low) | ~ 10-20% |
| < 0 | QPSK minimum | < 10% |
SINR vs. MCS: the field relationship
In practice, the SINR to MCS mapping is managed by the base station scheduler. The adaptive algorithm selects the modulation and coding rate based on the estimated downlink SINR. Observing the SINR/MCS correlation on a drive test trace validates the scheduler behavior and detects anomalies (overly conservative MCS = poorly calibrated scheduler).
Combined interpretation: key field scenarios
Scenario 1: Good RSRP, poor SINR
Typical values: RSRP = -80 dBm, SINR = -3 dB
Probable cause: pilot pollution (3+ cells at comparable power) Verification: check detected neighbor cells. If 3+ cells have RSRP > -90 dBm simultaneously β pilot pollution confirmed. Action: tilt/azimuth adjustment on contributing cells to establish cell dominance.
Scenario 2: Good RSRP, good SINR, poor throughput
Typical values: RSRP = -85 dBm, SINR = 18 dB, DL throughput = 3 Mbps
Probable cause: limited capacity (loaded cell), or UE Capabilities configuration issue (256QAM not activated) Verification: observe MCS and allocated RBs. If MCS is high but RBs are low β capacity problem. If MCS is low despite high SINR β scheduler configuration or UE Caps issue. Action: analyze cell load (PRB utilization), verify terminal UE Capabilities.
Scenario 3: Poor RSRP, good SINR
Typical values: RSRP = -108 dBm, SINR = 12 dB
Probable cause: cell edge zone with a single dominant cell (no interference) Verification: check that few or no neighbor cells are detected. Interpretation: the signal is weak but usable. The problem is coverage (distance to the antenna), not interference. Possible improvement: power increase or deployment of a repeater/small cell.
Scenario 4: Normal RSRQ, abnormally low SINR
Probable cause: external jamming or equipment issue (faulty RF cable, degraded PA) Verification: compare with other terminals on the same site. If the problem affects only one terminal β terminal issue. If it affects all terminals on a sector β network equipment issue.
Scenario 5: Highly variable SINR (rapid peaks / dips)
Typical values: SINR varying from 20 dB to -5 dB within a few seconds
Probable cause: unstable handover zone (ping-pong between two cells)
Verification: observe Measurement Reports and RRC Reconfiguration (handovers). If handovers are frequent β A3 configuration issues (time-to-trigger too short, hysteresis too low).
Action: adjust handover parameters (A3 offset, Time To Trigger, Hysteresis).
Practical measurement of the three indicators
Reading via Qualcomm DIAG (recommended method)
The Qualcomm DIAG interface exposes all three indicators with maximum granularity:
- RSRP per antenna (Rx0 to Rx3)
- RSRQ per antenna
- SINR per antenna and combined SINR
This reading is done via DIAG packets:
- LTE: packets
0xB193,0xB17F,0xB887 - 5G NR: packets
0xB97F,0xB821
Per-antenna reading is particularly useful for detecting antenna issues (one degraded Rx compared to the others reveals a connector or cable problem).
Reading via Android API
The TelephonyManager.getAllCellInfo() API exposes RSRP, RSRQ, and SINR since Android 9. The granularity is lower (no per-antenna reading), but sufficient for basic monitoring.
Limitations to note:
- The refresh rate is limited by Android (not real-time)
- Some OEMs filter or smooth the values
- SINR may not be available on all chipsets via this API
Conclusion
RSRP, RSRQ, and SINR form an inseparable trio for field diagnostics:
- RSRP answers βis there enough signal?β
- RSRQ answers βis the relative quality good?β
- SINR answers βis the signal actually usable?β
The combined interpretation of these three metrics, correlated with Layer 3 RRC messages, enables diagnosing 90% of mobile network performance issues in the field β without dedicated equipment, provided the modemβs DIAG interface is accessible.
Further Reading
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