Method and apparatus for transmitting and receiving scheduling requests
A communication method and system for converging a 5 th -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, a first synchronization signal;
identifying that a radio link quality of a serving beam corresponding to the first synchronization signal is worse than a first threshold;
in case that the radio link quality of the serving beam is worse than the first threshold, delivering an indication associated with a beam failure, wherein the indication associated with the beam failure is delivered from a physical layer of the terminal to a higher layer of the terminal;
identifying that the beam failure is detected on the serving beam based on the indication associated with the beam failure; and
based on the beam failure being detected, performing a random access procedure for a beam failure recovery with the base station,
wherein the random access procedure for the beam failure recovery is performed based on a beam corresponding to a second synchronization signal with a measurement result above a second threshold, and
wherein a medium access control (MAC) control element (CE) for the beam failure recovery is transmitted to the base station based on the random access procedure.
2. The method of claim 1 , further comprising:
receiving, from the base station, a radio resource control (RRC) message including configuration information associated with the first synchronization signal for detecting the beam failure.
3. The method of claim 1 ,
wherein the first threshold is a derived threshold associated with a specific block error rate (BLER) of a physical downlink control channel (PDCCH).
4. The method of claim 1 ,
wherein the second threshold is a reference signal received power (RSRP) threshold configured by the base station.
5. The method of claim 1 ,
wherein the beam corresponding to the second synchronization signal with an RSRP above the second threshold is identified for performing the random access procedure,
wherein the first synchronization signal includes at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS), and
wherein the second synchronization signal includes at least one of a PSS or an SSS.
6. A method performed by a base station in a communication system, the method comprising:
transmitting, to a terminal, a first synchronization signal; and
in case that a beam failure is detected on a serving beam corresponding to the first synchronization signal based on a radio link quality of the serving beam corresponding to the first synchronization signal being worse than a first threshold, performing a random access procedure for a beam failure recovery with the terminal based on a beam corresponding to a second synchronization signal with a measurement result above a second threshold,
wherein a medium access control (MAC) control element (CE) for the beam failure recovery is received from the terminal based on the random access procedure.
7. The method of claim 6 , further comprising:
transmitting, to the terminal, a radio resource control (RRC) message including configuration information associated with the first synchronization signal for detecting the beam failure.
8. The method of claim 6 , wherein the first threshold is a derived threshold associated with a specific block error rate (BLER) of a physical downlink control channel (PDCCH).
9. The method of claim 6 ,
wherein the second threshold is a reference signal received power (RSRP) threshold configured by the base station.
10. The method of claim 6 ,
wherein the beam corresponding to the second synchronization signal with an RSRP above the second threshold is identified for performing the random access procedure,
wherein the first synchronization signal includes at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS), and
wherein the second synchronization signal includes at least one of a PSS or an SSS.
11. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
receive, from a base station, a first synchronization signal,
identify that a radio link quality of a serving beam corresponding to the first synchronization signal is worse than a first threshold,
in case that the radio link quality of the serving beam is worse than the first threshold, deliver an indication associated with a beam failure, wherein the indication associated with the beam failure is delivered from a physical layer of the terminal to a higher layer of the terminal,
identify that the beam failure is detected on the serving beam based on the indication associated with the beam failure, and
based on the beam failure being detected, perform a random access procedure for a beam failure recovery with the base station,
wherein the random access procedure for the beam failure recovery is performed based on a beam corresponding to a second synchronization signal with a measurement result above a second threshold, and
wherein a medium access control (MAC) control element (CE) for the beam failure recovery is transmitted to the base station based on the random access procedure.
12. The terminal of claim 11 , wherein the controller is further configured to:
receive, from the base station, a radio resource control (RRC) message including configuration information associated with the first synchronization signal for detecting the beam failure.
13. The terminal of claim 11 ,
wherein the first threshold is a derived threshold associated with a specific block error rate (BLER) of a physical downlink control channel (PDCCH).
14. The terminal of claim 11 ,
wherein the second threshold is a reference signal received power (RSRP) threshold configured by the base station.
15. The terminal of claim 11 ,
wherein the beam corresponding to the second synchronization signal with an RSRP above the second threshold is identified for performing the random access procedure,
wherein the first synchronization signal includes at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS), and
wherein the second synchronization signal includes at least one of a PSS or an SSS.
16. A base station in a communication system, the base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
transmit, to a terminal, a first synchronization signal, and
in case that a beam failure is detected on a serving beam corresponding to the first synchronization signal based on a radio link quality of the serving beam corresponding to the first synchronization signal being worse than a first threshold, perform a random access procedure for a beam failure recovery with the terminal based on a beam corresponding to a second synchronization signal with a measurement result above a second threshold,
wherein a medium access control (MAC) control element (CE) for the beam failure recovery is received from the terminal based on the random access procedure.
17. The base station of claim 16 , wherein the controller is further configured to:
transmit, to the terminal, a radio resource control (RRC) message including configuration information associated with the first synchronization signal for detecting the beam failure.
18. The base station of claim 16 ,
wherein the first threshold is a derived threshold associated with a specific block error rate (BLER) of a physical downlink control channel (PDCCH).
19. The base station of claim 16 ,
wherein the second threshold is a reference signal received power (RSRP) threshold configured by the base station.
20. The base station of claim 16 ,
wherein the beam corresponding to the second synchronization signal with an RSRP above the second threshold is identified for performing the random access procedure.
wherein the first synchronization signal includes at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS), and
wherein the second synchronization signal includes at least one of a PSS or an SSS.