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What is the difference between Qrxlevmin and Qrxlevminoffset in cell selection criteria?

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What is the difference between Qrxlevmin and Qrxlevminoffset in cell selection criteria?
posted Feb 10, 2015 by Gnanendra Reddy

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2 Answers

+2 votes

As per my understanding,

The minimum RSRP requirement for cell selection is defined as Qrxlevmin.

When the UE is camped on a visited PLMN and cell selection is triggered for a high priority PLMN, then Qrxlevminoffset is subtracted from Qrxlevmin.

The offset reduces the value of Qrxlevmin, allows cell selection criteria easier

answer Feb 10, 2015 by Shivaraj Kenche
Deserves a wall recommendation for such a nice explanation :)
0 votes

Qrxlevmin: defines the minimum RSRP values measured by the UE in a cell to be able to get unrestricted coverage-based service in that cell.

Qrxlevminoffset: Offset of signalled Qrxlevmin taken into account in the Sexlev evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN.

Now let me put this in more simple words -
Cell Selection Criteria is Signal Strength/Quality Criteria and described as follows (36.304)

UE would not start registration even though it successfully detected a cell and even decoded MIB and SIBs unless the Srxleve > 0 and Squal > 0. So if a device does not even initiate the PRACH process even when it successfully decoded all the MIB and SIBs, checking on this criteria would be a good first step for the troubleshooting. (Of course, this is not the only issues for this case. there may be USIM issue and Band Indicator Issue, PLMN issues etc).

Cell Reselection Criteria

Credit: http://www.sharetechnote.com/html/Handbook_LTE_Cell_Selection_Criterion.html

answer Feb 10, 2015 by Salil Agrawal
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+1 vote

May I know the criteria to judge whether a certain neighbor cell is an Interference in LTE?

Like in UMTS, there is a Pilot Pollution in which the criteria is usually not more than 3 active set, has more than -85 dBm RSCP and RSCP1st-RSCp4th should be equal 5 dB.

Appreciate your help.

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