5G NR RSRP RSRQ SINR measurements | Define RSRP RSRQ SINR

This page mentions RSRP, RSRQ and SINR measurements used in 5G NR system. The definitions and use of RSRP, RSRQ and SINR in 5G NR are also mentioned.RRC Information Elements (IEs) which carries these measurements (i.e. RSRP, RSRQ, SINR) are also mentioned. It defines SS-RSRP, CSI-RSRP, SS-RSRQ, CSI-RSRQ, SS-SINR and CSI-SINR.

Introduction:
➤In LTE, RSRP and RSRQ are associated with CRS (Cell Specific Reference Signal). Refer LTE RSRP vs RSRQ >> for more information.
➤In 5G NR, CRS is not used. Instead SS (Synchronization Signal) and CSI (Channel State Information) are used.
➤As a result RSRP, RSRQ and SINR are associated with SS and CSI.
➤They are defined for FR1 and FR2. FR1 (Frequency Range 1) lies from 450 MHz to 6000 MHz and FR2 (Frequency Range 2) lies from 24250 MHz to 52600 MHz. FR1 uses subcarrier spacing of 15/30/60 KHz where as FR2 uses 60/120 KHz. FR1 supports transmission BWs from 5 MHz (min.) to 100 MHz(max.) where as FR2 supports 50MHz (min.), 100MHz, 200 MHz and 400 MHz(max.).
➤Refer 5G NR Reference Signals >>.

5G NR RSRP | SS-RSRP, CSI-RSRP

• SS-RSRP stands for SS reference signal received power.
• It is defined as linear average over the power contributions (in Watts) of the resource elements which carry secondary synchronization signals.
• The measurement time resource(s) for SS-RSRP are confined within SS/PBCH Block Measurement Time Configuration (SMTC) window duration.
• For frequency range 1, the reference point for the SS-RSRP shall be the antenna connector of the UE.
• For frequency range 2, SS-RSRP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch.

SS-RSRP is used for following.
If SS-RSRP is used for L1-RSRP,
RRC_CONNECTED intra-frequency.
Otherwise,
RRC_IDLE intra-frequency,
RRC_IDLE inter-frequency,
RRC_INACTIVE intra-frequency,
RRC_INACTIVE inter-frequency,
RRC_CONNECTED intra-frequency,
RRC_CONNECTED inter-frequency

• CSI-RSRP stands for CSI reference signal received power.
• It is defined as linear average over the power contributions (in Watts) of the resource elements which carry CSI reference signals configured for RSRP measurements.
• For CSI-RSRP determination CSI reference signals transmitted on antenna port 3000. (TS 38.211).
• For frequency range 1 (FR1), the reference point for the CSI-RSRP shall be the antenna connector of the UE.
• For frequency range 2 (FR2), CSI-RSRP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch.

CSI-RSRP is used for following.
If CSI-RSRP is used for L1-RSRP,
RRC_CONNECTED intra-frequency.
Otherwise,
RRC_CONNECTED intra-frequency,
RRC_CONNECTED inter-frequency

5G NR RSRQ | SS-RSRQ, CSI-RSRQ

• SS-RSRQ stands for Secondary synchronization Signal Reference Signal Received Quality.
• It is defined as ratio of N x SS-RSRP/NR carrier RSSI. Here N refers to number of resource blocks in NR carrier RSSI measurement Bandwidth. The measurements in N (Numerator) and D (Denominator) shall be made over same set of resource blocks (RBs).
• NR carrier RSSI is linear average of the total received power (Watts). It is observed only in certain OFDM symbols of measurement time resources, in the measurement bandwidth, over N number of resource blocks from all sources. The sources include co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc.

SS-RSRQ is used for following.
RRC_IDLE intra-frequency,
RRC_IDLE inter-frequency,
RRC_INACTIVE intra-frequency,
RRC_INACTIVE inter-frequency,
RRC_CONNECTED intra-frequency,
RRC_CONNECTED inter-frequency

• CSI-RSRQ stands for CSI Reference Signal Received Quality.
• It is defined as ratio of N x CSI-RSRP to CSI-RSSI.
• Here N is number of RBs in CSI-RSSI measurement BW.
• The measurement in N and D shall be made over same set of resource blocks (RBs).
• CSI Received Signal Strength Indicator (CSI-RSSI), comprises the linear average of the total received power (Watts). • It is observed only in OFDM symbols of measurement time resource(s), in the measurement bandwidth, over N number of RBs from all sources.
• This sources include co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc.
• The measurement time resources for CSI-RSSI corresponds to OFDM symbols containing configured CSI-RS occasions.

CSI-RSRQ is used for following.
RRC_CONNECTED intra-frequency,
RRC_CONNECTED inter-frequency

5G NR SINR | SS-SINR, CSI-SINR

• SS-SINR stands for SS signal-to-noise and interference ratio (SS-SINR).
• It is defined as the linear average over the power contribution (in Watts) of the resource elements carrying secondary synchronisation signals divided by the linear average of the noise and interference power contribution (in Watts) over the resource elements carrying secondary synchronisation signals within the same frequency bandwidth.

SS-SINR is used for following.
RRC_CONNECTED intra-frequency,
RRC_CONNECTED inter-frequency

• CSI-SINR stands for CSI signal-to-noise and interference ratio.
• It is defined as the linear average over the power contribution (in Watts) of the resource elements carrying CSI reference signals divided by the linear average of the noise and interference power contribution (in Watts) over the resource elements carrying CSI reference signals reference signals within the same frequency bandwidth.

CSI-SINR is used for following.
RRC_CONNECTED intra-frequency,
RRC_CONNECTED inter-frequency

RRC IEs carrying RSRP, RSRQ and SINR

Following pdf mentions RRC IEs (Information Elements) carrying RSRP, RSRQ and SINR measurements used in 5G NR system.

5G NR SRS

• SRS stands for Sounding Reference signal.
• It is used for UL channel sounding.
• In contrast to LTE, it is configured specific to UE.
• In time domain, it spans 1/2/4 consecutive symbols which are mapped within last six symbols of the slot.
• Multiple SRS symbols allow coverage extension and increased sounding capacity.
• The design of SRS and its frequency hopping mechanism is same as used in LTE.

Following tables are as per 3GPP TS 38.133 V15.2.0 specifications released in June 2018. The values in the tables are subjected to change as per latest releases from 3GPP.

Absolute Accuracy SS-RSRP Intra Frequency measurement

The requirements for absolute accuracy of SS-RSRP apply to a cell on the same carrier frequency as used by the serving cell.

Absolute SS-RSRP accuracy intra frequency

Relative Accuracy SS-RSRP Intra Frequency measurement

The relative accuracy of SS-RSRP is defined as SS-RSRP from one cell in comparison to SS_RSRP measured on another cell as the same frequency.

Relative SS-RSRP accuracy intra frequency

Absolute Accuracy SS-RSRP Inter Frequency measurement

The requirements for absolute accuracy of SS-RSRO apply to a cell which has different carrier frequency from the serving cell.

Absolute SS-RSRP accuracy inter frequency

Relative Accuracy SS-RSRP Inter Frequency measurement

The relative accuracy of SS-RSRP in inter-frequency test case is defined as RSRP measured from one cell in comparison to RSRP measured from another cell on different frequency.

Relative SS-RSRP accuracy inter frequency

References

• 3GPP TS 38.215, NR; Physical layer measurements
• 3GPP TS 38.331, NR; Radio Resource Control (RRC); Protocol specification
• 3GPP TS 38.133, NR; Requirements for support of radio resource management