Method and apparatus for measuring frequency in wireless communication system
A frequency measurement method performed by a user equipment (UE) in a wireless communication system is provided. The frequency measurement method includes: receiving a radio resource control (RRC) release message or system information including first frequency measurement configuration information for frequency measurement in an RRC inactive mode; performing frequency measurement in the RRC inactive mode based on the first frequency measurement configuration information; receiving first RRC resume message including an indicator requesting a measurement report in the RRC inactive mode; and transmitting an RRC resume complete message including the measurement report based on the indicator.
1. A method for frequency measurement by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, a first frequency measurement configuration;
transmitting, to the base station, a radio resource control (RRC) resume request message for a RAN notification area (RNA) update in a RRC inactive mode;
receiving, from the base station, a RRC release message in response to the RRC resume request message; and
in case that the RRC release message includes a second frequency measurement configuration:
stopping a timer for the frequency measurement;
releasing the first frequency measurement configuration;
starting the timer with a value included in the second frequency measurement configuration; and
performing frequency measurement based on the second frequency measurement configuration.
2. The method of claim 1 , wherein performing the frequency measurement comprises:
in case that the second frequency measurement configuration includes a frequency measurement list, performing the frequency measurement based on the second frequency measurement configuration.
3. The method of claim 2 , wherein the frequency measurement list comprises at least one of an evolved universal mobile telecommunication systems (UMTS) terrestrial radio access (EUTRA) frequency measurement list or a new radio (NR) frequency measurement list.
4. The method of claim 1 , wherein performing the frequency measurement comprises:
in case that the second frequency measurement configuration does not include a frequency measurement list and a system information of a camped on cell includes a third frequency measurement configuration, performing the frequency measurement based on the third frequency measurement configuration.
5. The method of claim 1 , further comprising:
in case that the RRC release message includes a suspend configuration, transiting to the RRC inactive mode.
6. A user equipment (UE) for performing frequency measurement in a wireless communication system, the UE comprising:
a transceiver; and
a controller connected to the transceiver, the controller configured to:
receive, from a base station, a first frequency measurement configuration,
transmit, to a base station, a radio resource control (RRC) resume request message for a RAN notification area (RNA) update in a RRC inactive mode,
receive, from the base station, a RRC release message in response to the RRC resume request message, and
in case that the RRC release message includes a second frequency measurement configuration:
stop a timer for the frequency measurement,
release the first frequency measurement configuration,
start the timer with a value included in the second frequency measurement configuration, and
perform frequency measurement based on the second frequency measurement configuration.
7. The UE of claim 6 , wherein the controller is configured to:
in case that the second frequency measurement configuration includes a frequency measurement list, perform the frequency measurement based on the second frequency measurement configuration.
8. The UE of claim 7 , wherein the controller is configured to:
in case that the second frequency measurement configuration does not include a frequency measurement list and a system information of a camped on cell includes a third frequency measurement configuration, perform the frequency measurement based on the third frequency measurement configuration.
9. The UE of claim 7 , wherein the frequency measurement list comprises at least one of an evolved UMTS terrestrial radio access (EUTRA) frequency measurement list or a new radio (NR) frequency measurement list.
10. The UE of claim 6 , wherein the controller is further configured to:
in case that the RRC release message includes a suspend configuration, transit to the RRC inactive mode.