User apparatus, and cell measurement method
A user apparatus configured to communicate with a base station in a mobile communication system that supports carrier aggregation, including: a management unit configured to receive, from the base station, a configuration message for adding a cell or a cell group in the carrier aggregation, and perform configuration of the cell or the cell group, and to receive, from the base station, measurement configuration information on measurement of the cell or the cell group; and a measurement unit configured to allow not to perform measurement of the cell or the cell group based on the measurement configuration information until a predetermined condition is satisfied, and to perform measurement of the cell or the cell group based on the measurement configuration information when the predetermined condition is satisfied to transmit a measurement report to the base station.
1. A user apparatus configured to communicate with a base station in a mobile communication system that supports carrier aggregation, comprising:
a management unit configured to receive, from the base station, a configuration message for adding a cell or a cell group in the carrier aggregation, and perform configuration of the cell or the cell group, and to receive, from the base station, measurement configuration information on measurement of the cell or the cell group; and
a measurement unit configured to allow not to perform measurement of the cell or the cell group based on the measurement configuration information until a predetermined condition is satisfied, and to perform measurement of the cell or the cell group based on the measurement configuration information when the predetermined condition is satisfied to transmit a measurement report to the base station,
wherein the predetermined condition is that the measurement unit receives a measurement start instruction from the base station,
wherein the measurement start instruction is separate from the configuration message and the measurement configuration information, and
wherein the measurement start instruction comprises a Medium Access Control (MAC) Control Element (CE).
2. The user apparatus as claimed in claim 1 , wherein the measurement unit is configured to stop measurement of the cell or the cell group when a predetermined period elapses after receiving the measurement start instruction, or when receiving a measurement stop instruction from the base station.
3. The user apparatus as claimed in claim 2 , wherein the management unit is configured to notify the base station of capability information including the number of cells or cell groups that can be activated at the same time in the user apparatus.
4. The user apparatus as claimed in claim 1 , wherein the predetermined condition is that quality of a specific cell or a specific cell group becomes lower than a predetermined value, or that the number of cells or cell groups that satisfy a specific quality condition becomes less than a predetermined value.
5. The user apparatus as claimed in claim 4 , wherein the management unit is configured to notify the base station of capability information including the number of cells or cell groups that can be activated at the same time in the user apparatus.
6. The user apparatus as claimed in claim 1 , wherein the management unit is configured to notify the base station of capability information including the number of cells or cell groups that can be activated at the same time in the user apparatus.
7. A cell measurement method performed by a user apparatus configured to communicate with a base station in a mobile communication system that supports carrier aggregation, comprising:
a step of receiving, from the base station, a configuration message for adding a cell or a cell group in the carrier aggregation, performing configuration of the cell or the cell group, and receiving, from the base station, measurement configuration information on measurement of the cell or the cell group; and
a step of not performing measurement of the cell or the cell group based on the measurement configuration information until a predetermined condition is satisfied, and performing measurement of the cell or the cell group based on the measurement configuration information when the predetermined condition is satisfied to transmit a measurement report to the base station,
wherein the predetermined condition is the reception of a measurement start instruction from the base station,
wherein the measurement start instruction is separate from the configuration message and the measurement configuration information, and
wherein the measurement start instruction comprises a Medium Access Control (MAC) Control Element (CE).