Method of cell selection in heirarchical cell structure based on cell quality
First Claim
1. A method of cell selection for a user equipment (UE), the method comprising:
- determining whether a hierarchical cell structure (HCS) is being used; and
if the HCS is being used,reading a parameter related to a HCS criteria (H criteria) from system information;
performing a measurement of cells;
identifying cells that satisfy a selection or eligibility criteria (S criteria) among the measured cells,wherein the S criteria is used to check whether a reception quality of a candidate cell is sufficient;
checking the H criteria for a cell that satisfies the S criteria; and
selecting a cell having a highest ranking criteria (R criteria) among cells that satisfy both the S criteria and the H criteria.
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Abstract
A method of cell selection for a user equipment (UE) is provided. If a hierarchical cell structure (HCS) is used in a serving cell of the UE, a ranking procedure is performed in a first manner if the UE has low mobility, and the ranking procedure is performed if in a second manner the UE has high mobility. When the UE has low mobility, the ranking procedure is performed for all measured cells that have a highest HCS priority among those cells that fulfill a criterion S and a criterion H≧0, or the ranking procedure is performed for all measured cells regardless of HCS priorities if no cell fulfills the criterion S and the criterion H≧0. When the UE has high mobility, the ranking procedure is performed for all measured cells, and if there are cells with lower HCS priority than the serving cell that fulfills the criterion S and the criterion H≧0, the ranking procedure is performed for all cells that have the highest HCS priority. Otherwise, if there are cells that fulfill the criterion S and the criterion H≧0 with a HCS priority that is higher than or equal to the HCS priority of the serving cell, then the ranking procedure is performed for all cells that have the lowest HCS priority, else, the ranking procedure is performed for all cells regardless of HCS priorities.
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Citations
15 Claims
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1. A method of cell selection for a user equipment (UE), the method comprising:
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determining whether a hierarchical cell structure (HCS) is being used; and if the HCS is being used, reading a parameter related to a HCS criteria (H criteria) from system information; performing a measurement of cells; identifying cells that satisfy a selection or eligibility criteria (S criteria) among the measured cells, wherein the S criteria is used to check whether a reception quality of a candidate cell is sufficient; checking the H criteria for a cell that satisfies the S criteria; and selecting a cell having a highest ranking criteria (R criteria) among cells that satisfy both the S criteria and the H criteria. - View Dependent Claims (2, 3, 4, 15)
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5. A method of cell selection for a user equipment (UE), the method comprising:
if a hierarchical cell structure (HCS) is used in a serving cell of the UE, when the UE has low mobility, performing a ranking procedure for all measured cells that have a highest HCS priority (criterion H) among those cells that fulfill a selection and eligibility criterion (criterion S) and a criterion H≧
0, orperforming the ranking procedure for all measured cells regardless of HCS priorities if no cell fulfills the criterion S and the criterion H≧
0,wherein the criterion S is used to check whether a received quality of a candidate cell is sufficient; and when the UE has high mobility, performing the ranking procedure for all measured cells, and among these measured cells if there are cells with a lower HCS priority than the serving cell that fulfills the criterion S and the criterion H≧
0, then among the cells that have the lower HCS priority than the serving cell, performing the ranking procedure for all cells that have a highest HCS priority among those cells that fulfill the criterion S and the criterion H≧
0,otherwise, if there are cells that fulfill the criterion S and the criterion H≧
0 with a HCS priority that is higher than or equal to the HCS priority of the serving cell, then among the cells that have the HCS priority that is higher than or equal to the HCS priority of the serving cell, performing the ranking procedure for all cells that have a lowest HCS priority among those cells that fulfill the criterion S and the criterion H≧
0,else, performing the ranking procedure for all cells regardless of HCS priorities. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
Specification