ity layer reads measured RSRP from a higher priority cell > min RSRP high + level threshold high measured RSRQ from a higher priority cell > min RSRQ high + quality threshold high where the thresholds on the right-hand side of the inequality are broadcast in the serving cell. The quality-based criterion is used if the 'quality threshold high' parameter is broadcast in SIB3. Otherwise (and in case of Release 8 UE) level-based criterion is used. Cell Reselection to Lower Priority Layer Reselection to a lower priority cell requires that the serving cell level or quality is below a minimum requirement and the corresponding target cell-level measurement quantity is better than a threshold. In plain text both of the following conditions must be fulfilled if RSRP is used as measurement quantity: RSRP serving cell < min RSRP serving + level threshold serving low RSRP lower priority cell > min RSRP low + level threshold neighbour low If RSRQ is used as measurement quantity, the criteria are RSRQ serving cell < min RSRQ serving + quality threshold serving low Inter-layer Mobility Optimization Table 15.2 Summary of Rel8 and Rel9 reselection criteria for LTE, UTRA FDD and GERAN Target cell layer (source Quality-based criterion (Rel9), is LTE) Level-based criterion optional Equal priority LTE RSRP >RSRP + Qhyst + TgtCellOffsets.n+FreqOffset Higher priority LTE RSRP > qRxLevMing + RSRQ > qRxQualMin + threshHigh,P threshHigh,Q Lower priority LTE RSRP < qRxLevMing + RSRQ qRxQualMing threshServLow,P threshServLow,Q RSRP,>qRxLevMin, + RSRQ > qRxQualMin, + threshLow,P threshLow,Q Higher priority UTRA RSCP > qRxLevMing + Ec/No > qRxQualMin, + threshHigh,P threshHigh,Q Ec/NO > qRxQualMin, Lower priority UTRA RSRPS < qRxLevMing + Ec/No qRxQualMing + threshServLow,P threshLow,Q Ec/NO >qRxQualMin, Higher priority GERAN RSRPs < qRxLevMing + threshServHigh,P Lower priority GERAN RSRPS < qRxLevMing + threshServLow,P RSRQ lower priority cell > min RSRQ low + quality threshold neighbour low Additionally for UTRA FDD target the received Ec/NO