What is the range of RSRP, RSRQ, RSSI and SINR value to get good data rate?

Question / Problem description:

What is the range of RSRP, RSRQ, RSSI and SINR value to get good data rate and how it is related to eNodeB transmition power ? And how these values are used at UE ?

Answer:

RSRP, RSRQ ,RSSI are the measurements that the UE takes for cell reselection or handover puroposes. It is not used for the purposes of the transmission settings, but to take the decision (by the UE – in case of cell reselection; or eNB – in case of handover) to move the UE to other cell. In the case of handover, the UE sends the measurement results according to the eNB commands (e.g. periodically or triggered by event). The power of the eNB is constant and does not depend on the RSRP / RSRQ / RSSI measurements.

The measurements and feedback that relate to the transmission settings are known as CQI (channel quality indicator). Depending on that value (CQI index), the eNB takes the decision to assign a particular MCS (modulation and coding scheme) for a particular UE. The higher the CQI (ranging from 0 up to 15) the higher the modulation and coding scheme and the higher the throughput. However it is up to the implemented receiver algorithms in the UE, at which SNIR the good throughput can be achieved (the algorithms are vendor dependent so the “good SNIR” may vary for various UEs).

References:

The description of RSRP / RSRQ and RSSI is given in the TS 36.214 and the use of them – i.e. measurement settings and reportings in the RRC spec (TS 36.331)

The description of CQI is given in the TS 36.213.

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4 thoughts on “What is the range of RSRP, RSRQ, RSSI and SINR value to get good data rate?

    • RSRQ is a kind of measure that relate to SINR (since it also describes signal quality). SINR is not defined in the 3GPP standard as a measure with a specific definition on how to calculate it and what for shall it be used. Therefore we cannot say which of these two will be more impacting throughput/user quality. Additionally both RSRQ and SINR can be calculated by using various algorithms, which are vendor dependent and it is up to the algorithm itself to be more or less precise. However if we define SINR to be used for MCS selection it has more impact on user throughput.

  1. Dear all, I want to ask a question in this place.
    How to use the cell-specific signal to measure SINR for LTE physical layer?
    Detail discription the problem: The CQI value will be sent to eNB in 1ms for TDD mode. If we want to get CQI value then we need to measured SINR. How to measured the SINR in 1ms and where can I find this explanation from spec?

    Thinks for your answer.

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