Configuration handling-based operating method in wireless communication system and apparatus supporting same
Disclosed is an operation method carried out by user equipment in a wireless communication system. The method comprises: connecting to a first serving cell; connecting to a second serving cell; and handling configuration used for operating from the second serving cell when the second serving cell is released from being a serving cell. The first serving cell is a primary cell (PCell), and the second serving cell is a secondary cell (SCell).
1. A method for operating a cell performed by a user equipment (UE) in a wireless communication system, the method comprising:
connecting to a primary cell (PCell);
connecting to a secondary cell (SCell);
releasing the SCell while the UE maintains a connection between the UE and the PCell; and
performing a configuration related to the released SCell when the SCell is released,
wherein the configuration comprises a measurement configuration for performing measurements and a report on the SCell, or a bearer configuration configured in the SCell, and
wherein the measurement configuration is a measurement configuration for relaxed measurements comprising measurements performed with lower frequency than common measurements.
2. The method of claim 1 , wherein:
the measurement configuration is a measurement configuration for relaxed measurements, and
the relaxed measurements comprise measurements in which an omission of use of a measurement gap configured in the UE is permitted.
3. The method of claim 1 , wherein performing the configuration comprises releasing the measurement configuration.
4. The method of claim 1 , wherein performing the configuration comprises relocating a bearer served by the second serving cell SCell based on the bearer configuration.
5. The method of claim 4 , wherein relocating the bearer comprises reassociating a data radio bearer (DRB) served by the SCell with the PCell.
6. The method of claim 5 , wherein reassociating the DRB with the PCell comprises a reassociation of a packet data convergence protocol (PDCP).
7. The method of claim 5 , wherein the reassociation of the DRB with the PCell comprises a reassociation of radio link control (RLC).
8. The method of claim 1 , wherein:
the PCell is a macro cell, and
the SCell is a small cell deployed in coverage of a macro cell.
9. A user equipment (UE), the UE comprises:
a radio frequency (RF) unit that sends and receives radio signals; and
a processor, operatively coupled to the RF unit, that:
connects to a primary cell (PCell),
connects to a secondary cell (SCell),
releases the SCell while the UE maintains a connection between the UE and the PCell, and
performs a configuration related to the released SCell when the SCell is released,
wherein the configuration comprises a measurement configuration for performing measurements and a report on the SCell, or a bearer configuration configured in the SCell, and
wherein the measurement configuration is a measurement configuration for relaxed measurements comprising measurements performed with lower frequency than common measurements.