Method of cell selection in heirarchical cell structure based on cell quality

A method of cell reselection for a user equipment (UE) in a network, the method comprising:

• performing, by the UE, a measurement of cells;
• determining, by the UE, whether a hierarchical cell structure (HCS) is used in a serving cell;
• if the HCS is not used in the serving cell, performing ranking of the measured cells satisfying a first criterion, wherein the first criterion is a cell selection criterion S that is used to select measured cells satisfying a minimum quality condition;
• if the HCS is used in the serving cell, performing ranking of the measured cells satisfying both the first criterion and a second criterion, wherein the second criterion is a quality level threshold criterion H that is used to determine whether a prioritized ranking according to hierarchical cell reselection rules apply;
• and
• performing, by the UE, cell reselection to a best cell in ranking of the measured cells satisfying both the first criterion and the second criterion,
• wherein the first criterion is considered prior to the second criterion when performing ranking of the measured cells.