Method for reporting the results of specific reference-cell-based quality measurement in a mobile communication system using carrier aggregation, and apparatus for the method
The present invention relates to a method in which a terminal reports the results of quality measurement based on a specific reference cell from among a plurality of serving cells for the terminal in a mobile communication system using carrier aggregation. The present invention also relates to a terminal apparatus for the method. For this purpose, the terminal receives measurement configuration information from a network, performs a quality measurement in accordance with the received measurement configuration information, determines whether or not a report criterion based on a specific reference cell from among the plurality of cells for the terminal is met in accordance with the measurement result, and, if the report criterion based on the specific reference cell is met, sends a report message, including the measurement results and an indicator that indicates the specific reference cell, to the network.
1. A method of reporting a cell measurement by a user equipment (UE) in a mobile communication system, the method comprising:
transmitting a first measurement report for a first type serving cell according to a reporting criterion configured in the UE;
configuring a second type serving cell in addition to the first type serving cell which is currently configured in the UE;
reporting a second measurement report for at least one of a plurality of serving cells including a first type serving cell and a second type serving cell according to the reporting criterion,
wherein the reporting criterion comprises a predetermined event which is applied to the first type serving cell only regardless of whether the second type serving cell has been configured in the UE,
wherein the reporting the second measurement report comprises reporting a result of cell measurement to a base station, if the reporting criterion of the predetermined event has been configured and if the result of the cell measurement satisfies the reporting criterion of the predetermined event in which a neighbor cell measurement becomes offset better than a serving cell measurement which excludes the second type serving cell.
2. The method of claim 1 , wherein the reporting criterion comprises at least one event which can be applied to both of the first type serving cell and the second type serving cell.
3. The method of claim 1 , wherein the first type serving cell is a primary cell (PCell) which is always activated and the second type serving cell is a secondary cell (SCell) which is can be deactivated.
4. The method of claim 1 , wherein the second measurement report contains cell ID information only if the second measurement report is related to the second type serving cell.
5. The method of claim 1 , wherein the reporting criterion comprises at least one of:
a first event in which a serving cell measurement which does not exclude the second type serving cell becomes better than a first threshold;
a second event in which the serving cell measurement which does not exclude the second type serving cell becomes worse than a second threshold;
a third event in which the neighbor cell measurement becomes better than a third threshold; and
a fourth event in which the serving cell measurement which excludes the second type serving cell becomes worse than a fourth threshold and the neighbor cell measurement becomes better than a fifth threshold.
6. The method of claim 5 , wherein the fourth event is applied only to the first type serving cell.
7. The method of claim 1 , further comprising:
receiving measurement configuration information including information on the reporting criterion;
measuring the first type serving cell or the second type serving cell according to the received measurement configuration information; and
checking whether a result of the measurement satisfies the reporting criterion.
8. The method of claim 7 ,
wherein measurement configuration information includes information on a measurement object on which the measurement to be performed, and
wherein the measurement object comprises at least one of an inter-frequency measurement and an intra-frequency measurement.
9. A non-transitory computer readable medium recorded thereon a program for executing the method of claim 1 .
10. A user equipment (UE) for reporting a cell measurement in a mobile communication system, the UE comprising:
a radio frequency (RF) module configured to receive or transmit a radio frequency signal;
a processor operatively connected to the RF module and configured to:
transmit a first measurement report for a first type serving cell according to a reporting criterion configured in the UE;
configure a second type serving cell in addition to the first type serving cell which is currently configured in the UE; and
report a second measurement report for at least one of a first type serving cell and a second type serving cell according to the reporting criterion,
wherein the reporting criterion comprises a predetermined event which is applied to the first type serving cell only regardless of whether the second type serving cell has been configured in the UE,
wherein the processor is configured to report the second measurement report by reporting a result of cell measurement to a base station, if the reporting criterion of the predetermined event has been configured and if the result of the cell measurement satisfies the reporting criterion of the predetermined event in which a neighbor cell measurement becomes offset better than a serving cell measurement which excludes the second type serving cell.
11. The UE of claim 10 , wherein the reporting criterion comprises at least one event which is available for both of the first type serving cell and the second type serving cell.
12. The UE of claim 10 , wherein the first type serving cell is a primary cell which is always activated and the second type serving cell is a secondary cell which is can be deactivated.
13. The UE of claim 10 , wherein the second measurement report contains cell ID information only if the second measurement report is related to the second type serving cell.
14. The UE of claim 10 , wherein the reporting criterion comprises at least one of:
a first event in which a serving cell measurement which does not exclude the second type serving cell becomes better than a first threshold;
a second event in which the serving cell measurement which does not exclude the second type serving cell becomes worse than a second threshold;
a third event in which the neighbor cell measurement becomes better than a third threshold; and
a fourth event in which the serving cell measurement which excludes the second type serving cell becomes worse than a fourth threshold and the neighbor cell measurement becomes better than a fifth threshold.
15. The UE of claim 14 , wherein the fourth event is applied only to the first type serving cell.
16. The UE of claim 10 , wherein the processor is further configured to:
receive measurement configuration information including information on the reporting criterion;
measure the first type serving cell or the second type serving cell according to the received measurement configuration information; and
check whether a result of the measurement satisfies the reporting criterion.
17. The UE of claim 16 ,
wherein measurement configuration information includes information on a measurement object on which the measurement to be performed, and
wherein the measurement object comprises at least one of an inter-frequency measurement and an intra-frequency measurement.