RSRQ Mapping

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RSRQ 3GPP Definition

RSRQ or Reference Signal Received Quality is defined as the ratio N×RSRP/(E-UTRA carrier RSSI), where N is the number of RB’s of the E-UTRA carrier RSSI measurement bandwidth. The measurements in the numerator and denominator shall be made over the same set of resource blocks.

In formula:

Scaling Table

Where:

  • N is the number of Physical Resource Blocks (PRBs) over which the RSSI is measured, typically equal to system bandwidth
  • RSSI is pure wideband power measurement, including intracell power, interference and noise (noise + serving cell power + interference power during RS symbol)
    E-UTRA – RSSI (Carrier Received Signal Strength Indicator)
    , comprises the linear average of the total received power (in [W]) observed only in OFDM symbols containing reference symbols for antenna port, in the measurement bandwidth, over N number of resource blocks by the UE from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc.
  • The reporting range of RSRQ is defined from -3…-19.5dB: See Graph and Table below

The reference point for the RSRQ shall be the antenna connector of the UE. If receiver diversity is in use by the UE, the reported value shall not be lower than the corresponding RSRQ of any of the individual diversity branches.

So we have that RSRQ depends on serving cell power and the number of Tx antennas

Applicable for: RRC_CONNECTED intra-frequency, RRC_CONNECTED inter-frequency

As you know from the definition of RSSI (RSRP and RSRQ-Measurement in LTE), it contains all sorts of power including:

  • power from co-channel serving & non-serving cells
  • adjacent channel interference
  • thermal noise
  • etc.

Therefore, (N x RSRP)/RSSI indicates “What is the portion of pure RS power over the whole E-UTRA power received by the UE“.

As you see, this is not the direct measurement, it is a kind of derived value from RSRP and RSSI. By dividing RSRP by RSSI, it could give some information about interference as well in addition to the strength of the wanted signal.

Since this is the ratio of two different power value, the unit of RSRQ is dB and the value would be always negative (because RSSI value will always be larger than N x RSRP)

UE usually measures RSRP or RSRQ based on the direction (RRC message) from the network and report the value. When it report this value, it does use the real RSRQ value.

It sends a non-negative value ranging from 0 to 34 and each of these values are mapped to a specific range of real RSRQ value as shown in the following table from 36.133.

RSRQFromToUnit
RSRQ_00-19.5dB
RSRQ_01-19.5-19.0dB
RSRQ_02-19.0-18.5dB
RSRQ_03-18.5-18.0dB
RSRQ_04-18.0-17.5dB
RSRQ_05-17.5-17.0dB
RSRQ_06-17.0-16.5dB
RSRQ_07-16.5-16.0dB
RSRQ_08-16.0-15.5dB
RSRQ_09-15.5-15.0dB
RSRQ_10-15.0-14.5dB
RSRQ_11-14.5-14.0dB
RSRQ_12-14.0-13.5dB
RSRQ_13-13.5-13.0dB
RSRQ_14-13.0-12.5dB
RSRQ_15-12.5-12.0dB
RSRQ_16-12.0-11.5dB
RSRQ_17-11.5-11.0dB
RSRQ_18-11.0-10.5dB
RSRQ_19-10.5-10.0dB
RSRQ_20-10.0-9.5dB
RSRQ_21-9.5-9.0dB
RSRQ_22-9.0-8.5dB
RSRQ_23-8.5-8.0dB
RSRQ_24-8.0-7.5dB
RSRQ_25-7.5-7.0dB
RSRQ_26-7.0-6.5dB
RSRQ_27-6.5-6.0dB
RSRQ_28-6.0-5.5dB
RSRQ_29-5.5-5.0dB
RSRQ_30-5.0-4.5dB
RSRQ_31-4.5-4.0dB
RSRQ_32-4.0-3.5dB
RSRQ_33-3.5-3.0dB
RSRQ_34-3.0dB

 

RSRP and RSRQ Measurement in LTE

 

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