Methods of managing terminal performed in base station and terminal

Abstract

Provided are methods of managing a terminal in a heterogeneous network (HetNet) environment. Between the methods, a method of managing a terminal performed in a base station includes determining whether or not a measurement change request event has occurred, and when a measurement change request event has occurred, transmitting a control message for instructing a change of a measurement operation to the terminal. Accordingly, it is possible to improve a measurement operation and discontinuous reception (DRX) operation control procedure necessary for connection control between one or more base stations and a terminal in a HetNet environment, and thereby performance of a system can be improved.

What is claimed is: 
     
         1 . A method of managing a terminal performed in a base station, the method comprising:
 determining whether or not to control measurement of the terminal;   generating measurement information for measurement of the terminal on the basis of the determination of whether or not to control measurement; and   providing the generated measurement information to the terminal using a control message.   
     
     
         2 . The method of  claim 1 , wherein determining whether or not to control measurement of the terminal includes determining which one among a connection state, an idle state and a limited connection state the terminal is placed in, determining whether or not a carrier aggregation (CA) service is provided to the terminal, determining information or request content received from the terminal, determining a mobility state of the terminal, or determining a type of the terminal as a condition for determining whether or not to control measurement of the terminal. 
     
     
         3 . The method of  claim 1 , wherein generating the measurement information for measurement of the terminal includes generating the measurement information causing at least one of channel state information (CSI) measurement, radio resource management (RRM) measurement, measurement for discovering a device-to-device (D2D) terminal, and measurement for D2D communication to be performed. 
     
     
         4 . The method of  claim 1 , wherein generating the measurement information for measurement of the terminal includes setting channel state information (CSI) measurement, radio resource management (RRM) measurement, measurement for discovering a device-to-device (D2D) terminal, and measurement for D2D communication differently according to frequency, or setting the measurement information differently according to cell. 
     
     
         5 . The method of  claim 1 , wherein generating the measurement information for measurement of the terminal includes generating at least one piece of measurement information among a measurement-target device, a measurement-target parameter, a measurement period, a measurement reporting period, and conditions for entering and releasing a measurement event. 
     
     
         6 . The method of  claim 1 , wherein generating the measurement information for measurement of the terminal includes generating the measurement information by associating a measurement reporting period of the terminal with a discontinuous reception (DRX) operation period of the terminal. 
     
     
         7 . The method of  claim 1 , wherein determining whether or not to control measurement includes determining whether or not at least one condition for changing operation of the terminal is satisfied among a case in which there is no data exchange with the terminal for a predetermined first time, a case in which no measurement-related event occurs for a predetermined second time, a case in which a variance of a measurement reporting value for a predetermined third time is in a predetermined range, a case in which it is determined that mobility management of the terminal is not necessary, a case in which the terminal requests a change according to a manual setting by a user, and a case in which a measurement reporting value provided by the terminal satisfies a predefined reference value. 
     
     
         8 . The method of  claim 7 , wherein generating the measurement information includes, when at least one condition for changing operation of the terminal is satisfied, generating the measurement information for instructing the terminal to perform at least one of a measurement and measurement reporting operation switch, a change of measurement and measurement reporting parameters, a discontinuous reception (DRX) operation switch, and a change of a DRX operation parameter. 
     
     
         9 . The method of  claim 1 , wherein determining whether or not to control measurement includes receiving operation level information defining operation of the terminal from the terminal. 
     
     
         10 . The method of  claim 9 , wherein generating the measurement information includes setting a parameter for at least one of a measurement operation and a discontinuous reception (DRX) operation of the terminal on the basis of the received operation level information on the terminal. 
     
     
         11 . The method of  claim 9 , wherein the operation level information on the terminal indicates at least one of a first measurement mode in which the terminal performs measurement and measurement reporting operations according to a set measurement parameter, a second measurement mode in which the terminal performs minimum measurement and measurement reporting operations while satisfying lowest service quality of a set radio bearer (RB), a third measurement mode in which the terminal selectively performs a measurement operation, a first DRX mode in which the terminal performs no DRX operation, a second DRX mode in which the terminal performs a DRX operation according to a set DRX parameter, and a third DRX mode in which the terminal performs the DRX operation to minimize power consumption of the terminal. 
     
     
         12 . A method of managing a terminal performed in the terminal, the method comprising:
 determining whether or not a measurement change request event has occurred; and   when a measurement change request event has occurred, transmitting a message for requesting a change of a measurement operation to a base station.   
     
     
         13 . The method of  claim 12 , wherein determining whether or not a measurement change request event has occurred includes determining that a measurement change request event has occurred when at least one case occurs among a case in which a user of the terminal has changed a setting, a case in which a set timer has been expired, and a case in which an event based on mobility state estimation (MSE) has occurred. 
     
     
         14 . The method of  claim 13 , wherein it is determined that the event based on MSE has occurred when an intensity of a signal transmitted from the base station is lower than a predetermined threshold value, or when the terminal is determined to have moved out of a specific area on the basis of location information on the terminal. 
     
     
         15 . The method of  claim 12 , wherein transmitting the message for requesting a change of a measurement operation to the base station includes transmitting the request message for requesting stop of measurement and measurement reporting, restart of measurement and measurement reporting, or a change of a measurement parameter. 
     
     
         16 . The method of  claim 12 , wherein transmitting the message for requesting a change of a measurement operation to the base station includes transmitting operation level information defining operation of the terminal to the base station. 
     
     
         17 . The method of  claim 16 , wherein the operation level information is information defining an operation level of measurement and measurement reporting of the terminal or a discontinuous reception (DRX) operation level of the terminal. 
     
     
         18 . The method of  claim 17 , wherein the operation level information on measurement and measurement reporting of the terminal includes at least one piece of information among measurement operation activation/deactivation information, threshold values for conditions for entering and releasing a measurement event, a threshold value of a timer for measurement management, a measurement event-triggering threshold value, an adjustment value for adjusting measurement event triggering, a timer value for triggering execution of measurement or measurement reporting, a measurement period, a measurement reporting period, a measurement-target frequency, and a type of a measurement-target cell. 
     
     
         19 . The method of  claim 17 , wherein the information defining the DRX operation level of the terminal includes at least one piece of information among a DRX period, a section for monitoring control information, a timer for a DRX operation, and activation/deactivation information on the DRX operation.