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LTE: Difference between RSRQ and RSRP ?

+3 votes
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LTE: Difference between RSRQ and RSRP ?
posted Mar 12, 2014 by Neeraj Mishra

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1 Answer

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The RSRP is comparable to the CPICH RSCP measurement in WCDMA. This measurement of the signal strength of an LTE cell helps to rank between the different cells as input for handover and cell reselection decisions. The RSRP is the average of the power of all resource elements which carry cell-specific reference signals over the entire bandwidth. It can therefore only be measured in the OFDM symbols carrying reference symbols.

The RSRQ measurement provides additional information when RSRP is not sufficient to make a reliable handover or cell reselection decision. RSRQ is the ratio between the RSRP and the Received Signal Strength Indicator (RSSI), and depending on the measurement bandwidth, means the number of resource blocks. RSSI is the total received wideband power including all interference and thermal noise. As RSRQ combines signal strength as well as interference level, this measurement value provides additional help for mobility decisions.

answer Mar 12, 2014 by Sandeep
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+3 votes

On what basis, source eNodeB decides to consider RSRP or RSRQ for neighbor cell power measurement ?

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What would be the difference if trigger quantity set to RSRP and report quantity set to both (RSRP and RSRQ).

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I was wondering if I change HO decision based on RSRP to RSRQ, do I also need to change other variables, such as a3offset, hysteresis, filter-coefficient, TTT or other variables (I don't know a lot, I am an intern). The range for RSRQ is smaller relative to RSRP. This is the reason why I am thinking that other variables need to change to adjust to the range for RSRQ.

I was looking at a dense cell site zone, where RSRQ was terrible and RSRP was very good. UE make the decisions there based on RSRP, resulting in different HO types, such as HO_Early, HO_Late, Wrong_Cell.

Did you guys come across similar problems? If so how did you guys tackle the issue?

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