Method and apparatus for performing early frequency measurement and fast reporting by terminal in disconnected state in next generation mobile communication system
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure discloses a method and apparatus for performing early frequency measurement and fast reporting a result of frequency measurement.
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving a radio resource control (RRC) release message including a measurement configuration for an RRC inactive-state;
receiving, from a base station, first system information associated with an RRC inactive measurement; and
in case that neither first information on a list of carriers for a first radio access technology (RAT) to be measured during the RRC inactive nor second information on a list of carriers for a second RAT to be measured during the RRC inactive is included in the measurement configuration,
performing, based on third information on a list of carriers for the first RAT and fourth information on a list of carriers for the second RAT included in the first system information, a measurement for the list of carriers for the first RAT in the third information and the list of carriers for the second RAT in the fourth information while the UE is in the RRC inactive,
wherein the first RAT corresponds to an evolved universal mobile telecommunications system terrestrial radio access (EUTRA), and the second RAT corresponds to a new radio (NR).
2. The method of claim 1 , further comprising:
in case that the measurement configuration includes at least one of the first information or the second information, performing, based on at least one of the first information or the second information, a measurement for at least one of the list of carriers for the first RAT in the first information or the list of carriers for the second RAT in the second information while the UE is in the RRC inactive.
3. The method of claim 1 , further comprising:
transmitting, to the base station, an RRC resume complete message including information indicating that the UE has available measurement information;
receiving, from the base station, a UE information request message requesting the available measurement information; and
transmitting, to the base station, a UE information response message including a result of the measurement performed while the UE is in the RRC inactive,
wherein the result of the measurement includes at least one of a first result for the list of carriers for the first RAT or a second result for the list of carriers for the second RAT.
4. The method of claim 1 , wherein the measurement is performed, in case that a second system information received from the base station includes information indicating the UE to perform the measurement and report a result of the measurement.
5. The method of claim 1 ,
wherein the RRC release message further includes measurement duration information, validity area information, and threshold information,
wherein a T331 timer is started based on a value of the measurement duration information, and
wherein the measurement is performed during the T331 timer is running.
6. A method performed by a base station in a wireless communication system, the method comprising:
transmitting a first system information associated with a radio resource control (RRC) inactive measurement;
receiving, from a user equipment (UE) which received an RRC release message including a measurement configuration for an RRC inactive, a random access preamble;
transmitting, to the UE, a random access response based on the random access preamble;
receiving, from the UE, an RRC resume request message based on the random access response;
transmitting, to the UE, an RRC resume message based on the RRC resume request message; and
receiving, from the UE, an RRC resume complete message including information indicating that the UE has available measurement information,
wherein, in case that neither first information on a list of carriers for a first radio access technology (RAT) to be measured during the RRC inactive nor second information on a list of carriers for a second RAT to be measured during the RRC inactive is included in the measurement configuration, a measurement, based on third information on a list of carriers for the first RAT and fourth information on a list of carriers for the second RAT included in the first system information, for the list of carriers for the first RAT in the third information and the list of carriers for the second RAT in the fourth information is performed while the UE is in the RRC inactive, and
wherein the first RAT corresponds to an evolved universal mobile telecommunications system terrestrial radio access (EUTRA), and the second RAT corresponds to a new radio (NR).
7. The method of claim 6 , wherein, in case that the measurement configuration includes at least one of the first information or the second information, the measurement, based on at least one of the first information or the second information, for at least one of the list of carriers for the first RAT in the first information or the list of carriers for the second RAT in the second information is performed while the UE is in the RRC inactive.
8. The method of claim 6 , further comprising:
transmitting, to the UE, a UE information request message requesting the available measurement information based on the information indicating that the UE has available measurement information; and
receiving, from the UE, a UE information response message including a result of the measurement performed while the UE is in the RRC inactive,
wherein the result of the measurement includes at least one of a first result for the list of carriers for the first RAT or a second result for the list of carriers for the second RAT.
9. The method of claim 6 , wherein the measurement is performed, in case that a second system information includes information indicating the UE to perform the measurement and report a result of the measurement.
10. The method of claim 6 ,
wherein the RRC release message further includes measurement duration information, validity area information, and threshold information,
wherein a T331 timer is started based on a value of the measurement duration information, and
wherein the measurement is performed during the T331 timer is running.
11. A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
a controller configured to:
receive a radio resource control (RRC) release message including a measurement configuration for an RRC inactive,
receive, from a base station, first system information associated with an RRC inactive measurement, and
in case that neither first information on a list of carriers for a first radio access technology (RAT) to be measured during the RRC inactive nor second information on a list of carriers for a second RAT to be measured during the RRC inactive is included in the measurement configuration, perform, based on third information on a list of carriers for the first RAT and fourth information on a list of carriers for the second RAT included in the first system information, a measurement for the list of carriers for the first RAT in the third information and the list of carriers for the second RAT in the fourth information while the UE is in the RRC inactive,
wherein the first RAT corresponds to an evolved universal mobile telecommunications system terrestrial radio access (EUTRA), and the second RAT corresponds to a new radio (NR).
12. The UE of claim 11 , wherein, in case that the measurement configuration includes at least one of the first information or the second information, the controller is configured to perform, based on at least one of the first information or the second information, a measurement for at least one of the list of carriers for the first RAT in the first information or the list of carriers for the second RAT in the second information while the UE is in the RRC inactive.
13. The UE of claim 11 , wherein the controller is further configured to:
transmit, to the base station, an RRC resume complete message including information indicating that the UE has available measurement information,
receive, from the base station, a UE information request message requesting the available measurement information, and
transmit, to the base station, a UE information response message including a result of the measurement performed while the UE is in the RRC inactive,
wherein the result of the measurement includes at least one of a first result for the list of carriers for the first RAT or a second result for the list of carriers for the second RAT.
14. The UE of claim 11 , wherein the measurement is performed, in case that a second system information received from the base station includes information indicating the UE to perform the measurement and report a result of the measurement.
15. The UE of claim 11 ,
wherein the RRC release message further includes measurement duration information, validity area information, and threshold information,
wherein a T331 timer is started based on a value of the measurement duration information, and
wherein the measurement is performed during the T331 timer is running.
16. A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller configured to:
transmit a first system information associated with a radio resource control (RRC) inactive measurement,
receive, from a user equipment (UE) which received an RRC release message including a measurement configuration for an RRC inactive, a random access preamble,
transmit, to the UE, a random access response based on the random access preamble,
receive, from the UE, an RRC resume request message based on the random access response,
transmit, to the UE, an RRC resume message based on the RRC resume request message, and
receive, from the UE, an RRC resume complete message including information indicating that the UE has available measurement information,
wherein, in case that neither first information on a list of carriers for a first radio access technology (RAT) to be measured during the RRC inactive nor second information on a list of carriers for a second RAT to be measured during the RRC inactive is included in the measurement configuration, a measurement, based on third information on a list of carriers for the first RAT and fourth information on a list of carriers for the second RAT included in the first system information, for the list of carriers for the first RAT in the third information and the list of carriers for the second RAT in the fourth information is performed while the UE is in the RRC inactive, and
wherein the first RAT corresponds to an evolved universal mobile telecommunications system terrestrial radio access (EUTRA), and the second RAT corresponds to a new radio (NR).
17. The base station of claim 16 , wherein, in case that the measurement configuration includes at least one of the first information or the second information, the measurement, based on at least one of the first information or the second information, for at least one of the list of carriers for the first RAT in the first information or the list of carriers for the second RAT in the second information is performed while the UE is in the RRC inactive.
18. The base station of claim 16 , wherein the controller is further configured to:
transmit, to the UE, a UE information request message requesting the available measurement information based on the information indicating that the UE has available measurement information, and
receive, from the UE, a UE information response message including a result of the measurement performed while the UE is in the RRC inactive,
wherein the result of the measurement includes at least one of a first result for the list of carriers for the first RAT or a second result for the list of carriers for the second RAT.
19. The base station of claim 16 , wherein the measurement is performed, in case that a second system information includes information indicating the UE to perform the measurement and report a result of the measurement.
20. The base station of claim 16 ,
wherein the RRC release message further includes measurement duration information, validity area information, and threshold information,
wherein a T331 timer is started based on a value of the measurement duration information, and
wherein the measurement is performed during the T331 timer is running.