What is SS-SINR?
SS-SINR (SS Signal-to-Interference-plus-Noise Ratio) is the ratio of the SS reference signal power to the combined interference and noise power, measured per SS/PBCH block. SS-SINR provides the most direct indication of achievable link quality and throughput potential on each beam, making it the most useful single measurement for 5G NR performance assessment. It was introduced in 3GPP Release 16 as a mandatory UE measurement for beam management and mobility.
How Does SS-SINR Work?
SS-SINR is computed as the power of the SSS resource elements divided by the linear average of the interference and noise power observed on the same resource elements. Unlike SS-RSRQ (which uses total wideband power in the denominator), SS-SINR directly estimates the signal-to-interference-plus-noise ratio, providing a more accurate prediction of demodulation performance. SS-SINR ranges from -23 to 40 dB with 0.5 dB resolution. It is used for L1 beam reporting (where the UE reports the best beam indices based on SS-SINR), conditional handover evaluation, and CQI estimation for initial MCS selection before CSI-RS-based measurements are available.
Use Cases
5G NR beam management and beam selection, conditional handover evaluation, initial link quality assessment, coverage and capacity optimization, and network performance benchmarking.
3GPP / Standards Reference
3GPP TS 38.215 (NR physical layer measurements), 3GPP TS 38.133 (NR RRM — SS-SINR requirements)
Related Terms
SS-RSRP | SS-RSRQ | SNIR | Beamforming | gNB
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This glossary entry is part of the 5GWorldPro Complete 5G Glossary. To go deeper into 5G architecture and technology, explore our 5G Training courses.
