Method and apparatus for performing radio link monitoring in wireless communication system
A communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4 th -Generation (4G) system with a technology for Internet of Things (IoT) are provided. The present 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. A method and apparatus of activating/deactivating cells with scalable transmission time intervals (TTIs) is disclosed.
1. A method performed by a terminal in a communication system, the method comprising:
receiving, from a base station, configuration information for a radio link monitoring using a synchronization signal including at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS);
identifying that link failure for a beam is detected based on whether a measurement result for the synchronization signal is less than a threshold; and
initiating a random access procedure with the base station based on the identifying,
wherein a medium access control (MAC) control element (CE) indicating a recovery for the link failure is transmitted to the base station in the random access procedure.
2. The method of claim 1 , further comprising:
identifying a beam corresponding to a synchronization signal whose measurement result is higher than or equal to the threshold among at least one beam configured in the terminal.
3. The method of claim 1 , further comprising:
identifying whether a radio link failure is detected based on the measurement result for the synchronization signal.
4. The method of claim 3 , further comprising:
in case that the radio link failure is detected, performing a procedure for a radio resource control (RRC) connection reestablishment.
5. The method of claim 4 , further comprising:
receiving, from the base station, information on a timer and a counter for the radio link monitoring,
wherein whether the radio link failure is detected is based on expiration of the timer,
wherein, in case that an indicator of out-of sync is received, the timer starts, and
wherein, in case that an indicator of in-sync is received consecutively for a number of times corresponding to the counter while the timer is running, the timer is stopped.
6. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller configured to control to:
receive, from a base station via the transceiver, configuration information for a radio link monitoring using a synchronization signal including at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS),
identify that link failure for a beam is detected based on whether a measurement result for the synchronization signal is less than a threshold, and
initiate a random access procedure with the base station based on the identification,
wherein a medium access control (MAC) control element (CE) indicating a recovery for the link failure is transmitted to the base station in the random access procedure.
7. The terminal of claim 6 , wherein the controller is further configured to control to:
identify a beam corresponding to a synchronization signal whose measurement result is higher than or equal to the threshold among at least one beam configured in the terminal.
8. The terminal of claim 6 , wherein the controller is further configured to control to:
identify whether a radio link failure is detected based on the measurement result for the synchronization signal.
9. The terminal of claim 8 , wherein the controller is further configured to control to:
in case that the radio link failure is detected, perform a procedure for a radio resource control (RRC) connection reestablishment.
10. The terminal of claim 8 , wherein the controller is further configured to control to:
receive, from the base station, information on a timer and a counter for the radio link monitoring,
wherein whether the radio link failure is detected is based on expiration of the timer,
wherein, in case that an indicator of out-of sync is received, the timer starts, and
wherein, in case that an indicator of in-sync is received consecutively for a number of times corresponding to the counter while the timer is running, the timer is stopped.
11. A method performed by a base station in a communication system, the method comprising:
transmitting, to a terminal, configuration information for a radio link monitoring using a synchronization signal including at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS); and
transmitting, to the terminal, the synchronization signal based on the configuration information,
wherein link failure for a beam is detected based on whether a measurement result of the synchronization signal is less than a threshold,
wherein a random access procedure with the terminal is initiated based on a detection of the link failure, and
wherein a medium access control (MAC) control element (CE) indicating a recovery for the link failure is received from the terminal in the random access procedure.
12. The method of claim 11 , wherein a beam corresponding to a synchronization signal whose measurement result is higher than or equal to the threshold among at least one beam configured in the terminal is identified by the terminal.
13. The method of claim 11 , wherein whether a radio link failure is detected based on the measurement result for the synchronization signal.
14. The method of claim 13 , wherein, in case that the radio link failure is detected, a procedure for a radio resource control (RRC) connection reestablishment is performed with the terminal.
15. The method of claim 13 , further comprising:
transmitting, to the terminal, information on a timer and a counter for the radio link monitoring,
wherein whether the radio link failure is detected is based on expiration of the timer,
wherein, in case that an indicator of out-of sync is received by the terminal, the timer starts, and
wherein, in case that an indicator of in-sync is received by the terminal consecutively for a number of times corresponding to the counter while the timer is running, the timer is stopped.
16. A base station in a communication system, the base station comprising:
a transceiver; and
a controller configured to control to:
transmit, to a terminal via the transceiver, configuration information for a radio link monitoring using synchronization signal including at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and
transmit, to the terminal via the transceiver, the synchronization signal based on the configuration information,
wherein link failure for a beam is detected based on whether a measurement result of the synchronization signal is less than a threshold,
wherein a random access procedure with the terminal is initiated based on a detection of the link failure, and
wherein a medium access control (MAC) control element (CE) indicating a recovery for the link failure is received from the terminal in the random access procedure.
17. The base station of claim 16 , wherein a beam corresponding to a synchronization signal whose measurement result is higher than or equal to the threshold among at least one beam configured in the terminal is identified by the terminal.
18. The base station of claim 16 , wherein whether a radio link failure is detected based on the measurement result for the synchronization signal.
19. The base station of claim 18 , wherein, in case that the radio link failure is detected, a procedure for a radio resource control (RRC) connection reestablishment is performed with the terminal.
20. The base station of claim 18 , wherein the controller is further configured to control to:
transmit, to the terminal, information on a timer and a counter for the radio link monitoring,
wherein whether the radio link failure is detected is based on expiration of the timer,
wherein, in case that an indicator of out-of sync is received by the terminal, the timer starts, and
wherein, in case that an indicator of in-sync is received by the terminal consecutively for a number of times corresponding to the counter while the timer is running, the timer is stopped.