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 ?
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).
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.