US-12628011-B2 - Method and device for notifying of beam failure recovery in wireless communication system

Abstract

The disclosure provides a method, performed by a user equipment (UE), of performing beam failure detection and recovery, the method including: receiving, from a base station (BS), configuration information about beam failure detection and recovery; detecting a beam failure with respect to a special cell (SpCell) or a secondary cell (Scell), based on the configuration information; and transmitting, based on a result of the detecting, a beam failure recovery (BFR) medium access control (MAC) control element (CE) (BFR MAC CE) via a random access procedure or on an uplink (UL) resource or a scheduling request (SR) resource which is for transmission of the BFR MAC CE, wherein the BFR MAC CE includes information about detection or non-detection of a beam failure with respect to the SpCell.

Inventors

• Jaehyuk JANG
• Anil Agiwal

Assignees

• SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date

20260512

Application Date

20210319

Priority Date

20200320

Claims (20)

1. 1 . A method, performed by a user equipment (UE), of performing beam failure detection and recovery, the method comprising: receiving configuration information associated with beam failure detection and recovery; detecting a beam failure for a special cell (SpCell) based on the configuration information, wherein the SpCell is a primary cell (PCell) of a master cell group (MCG) or a primary secondary cell (PSCell) of a secondary cell group (SCG); and transmitting, based on the detecting, a first beam failure recovery (BFR) medium access control (MAC) control element (CE) (BFR MAC CE) via a random access procedure, wherein the first BFR MAC CE comprises a one-bit field, wherein, based on the first BFR MAC CE being transmitted in the MCG, the one-bit field indicates detection of the beam failure for the PCell, and wherein, based on the first BFR MAC CE being transmitted in the SCG, the one-bit field indicates detection of the beam failure for the PSCell.
2. 2 . The method of claim 1 , further comprising: identifying, based on detecting a beam failure for a secondary cell (SCell), whether an uplink resource is available for a transmission of a second BFR MAC CE; in case that the uplink resource is available, transmitting the second BFR MAC CE using the uplink resource; and in case that the uplink resource is not available, triggering a scheduling request (SR) for the transmission of the second BFR MAC CE.
3. 3 . The method of claim 2 , wherein the transmitting of the second BFR MAC CE comprises indicating a multiplexing and assembly entity to generate the second BFR MAC CE.
4. 4 . The method of claim 1 , wherein the transmitting of the first BFR MAC CE via the random access procedure comprises: identifying, based on the random access procedure being a 4-step random access, whether a random access response reception is successful; and including, based on the random access response reception being successful, the first BFR MAC CE in a Msg3 transmission of the 4-step random access.
5. 5 . The method of claim 1 , wherein the first BFR MAC CE further comprises an available candidate (AC) field for a secondary cell (SCell), and wherein the AC field for the SCell indicates whether a candidate reference signal ID field is present in the first BFR MAC CE.
6. 6 . The method of claim 1 , wherein, in case that the one-bit field indicates detection of the beam failure for the SpCell, the first BFR MAC CE does not comprise an available candidate (AC) field for the SpCell.
7. 7 . The method of claim 1 , wherein the configuration information comprises information indicating that the UE is configured to report the beam failure for the SpCell.
8. 8 . The method of claim 1 , wherein the transmitting of the first BFR MAC CE via the random access procedure comprises: identifying, based on the random access procedure being a 2-step random access, whether a MsgA transmission of the 2-step random access is an initial transmission; and including, based on the MsgA transmission being the initial transmission and the random access procedure being initiated for an SpCell beam failure recovery, the first BFR MAC CE in the MsgA transmission.
9. 9 . A user equipment (UE) for performing beam failure detection and recovery, the UE comprising: a transceiver; and a processor coupled with the transceiver and configured to: receive configuration information associated with beam failure detection and recovery, detect a beam failure for a special cell (SpCell) based on the configuration information, wherein the SpCell is a primary cell (PCell) of a master cell group (MCG) or a primary secondary cell (PSCell) of a secondary cell group (SCG), and transmit, based on the detecting, a first beam failure recovery (BFR) medium access control (MAC) control element (CE) (BFR MAC CE) via a random access procedure, wherein the first BFR MAC CE comprises a one-bit field, wherein, based on the first BFR MAC CE being transmitted in the MCG, the one-bit field indicates detection of the beam failure for the PCell, and wherein, based on the first BFR MAC CE being transmitted in the SCG, the one-bit field indicates detection of the beam failure for the PSCell.
10. 10 . The UE of claim 9 , wherein the processor is further configured to: identify, based on the random access procedure being a 4-step random access, whether a random access response reception is successful, and include, based on the random access response reception being successful, the first BFR MAC CE in a Msg3 transmission of the 4-step random access.
11. 11 . The UE of claim 9 , wherein, in case that the one-bit field indicates detection of the beam failure for the SpCell, the first BFR MAC CE does not comprise an available candidate (AC) field for the SpCell.
12. 12 . The UE of claim 9 , wherein the processor is further configured to: identify, based on detecting a beam failure for a secondary cell (SCell), whether an uplink resource is available for a transmission of a second BFR MAC CE, in case that the uplink resource is available, transmit the second BFR MAC CE using the uplink resource, and in case that the uplink resource is not available, trigger a scheduling request (SR) for the transmission of the second BFR MAC CE.
13. 13 . The UE of claim 9 , wherein the first BFR MAC CE further comprises an available candidate (AC) field for a secondary cell (SCell), and wherein the AC field for the SCell indicates whether a candidate reference signal ID field is present in the first BFR MAC CE.
14. 14 . The UE of claim 9 , wherein the configuration information comprises information indicating that the UE is configured to report the beam failure for the SpCell.
15. 15 . The UE of claim 9 , wherein the processor is further configured to: identify, based on the random access procedure being a 2-step random access, whether a MsgA transmission of the 2-step random access is an initial transmission, and include, based on the MsgA transmission being the initial transmission and the random access procedure being initiated for an SpCell beam failure recovery, the first BFR MAC CE in the MsgA transmission.
16. 16 . A non-transitory computer-readable storage medium storing computer-executable instructions that, when executed by a processor of a user equipment (UE), cause the UE to perform operations, the operations comprising: receiving configuration information associated with beam failure detection and recovery; detecting a beam failure for a special cell (SpCell) based on the configuration information, wherein the SpCell is a primary cell (PCell) of a master cell group (MCG) or a primary secondary cell (PSCell) of a secondary cell group (SCG); and transmitting, based on the detecting, a first beam failure recovery (BFR) medium access control (MAC) control element (CE) (BFR MAC CE) via a random access procedure, wherein the first BFR MAC CE comprises a one-bit field, wherein, based on the first BFR MAC CE being transmitted in the MCG, the one-bit field indicates detection of the beam failure for the PCell, and wherein, based on the first BFR MAC CE being transmitted in the SCG, the one-bit field indicates detection of the beam failure for the PSCell.
17. 17 . The non-transitory computer-readable storage medium of claim 16 , wherein the operations further comprise: identifying, based on detecting a beam failure for a secondary cell (SCell), whether an uplink resource is available for a transmission of a second BFR MAC CE; in case that the uplink resource is available, transmitting the second BFR MAC CE using the uplink resource; and in case that the uplink resource is not available, triggering a scheduling request (SR) for the transmission of the second BFR MAC CE.
18. 18 . The non-transitory computer-readable storage medium of claim 16 , wherein the operations further comprise: identifying, based on the random access procedure being a 4-step random access, whether a random access response reception is successful; and including, based on the random access response reception being successful, the first BFR MAC CE in a Msg3 transmission of the 4-step random access.
19. 19 . The non-transitory computer-readable storage medium of claim 16 , wherein, in case that the one-bit field indicates detection of the beam failure for the SpCell, the first BFR MAC CE does not comprise an available candidate (AC) field for the SpCell.
20. 20 . The non-transitory computer-readable storage medium of claim 16 , wherein the configuration information comprises information indicating that the UE is configured to report the beam failure for the SpCell.

Description

TECHNICAL FIELD The disclosure relates to a method of indicating a beam failure recovery with respect to a special cell (SpCell) in a wireless communication system. BACKGROUND ART In order to meet increasing demand with respect wireless data traffic after the commercialization of 4th generation (4G) communication systems, efforts have been made to develop 5th generation (5G) or pre-5G communication systems. For this reason, 5G or pre-5G communication systems are called ‘beyond 4G network’ communication systems or ‘post long term evolution (post-LTE)’ systems. In order to achieve high data rates, implementation of 5G communication systems in an ultra-high frequency millimeter-wave (mmWave) band (e.g., a 60-gigahertz (GHz) band) is being considered. In order to reduce path loss of radio waves and increase a transmission distance of radio waves in the ultra-high frequency band for 5G communication systems, various technologies such as beamforming, massive multiple-input and multiple-output (massive MIMO), full-dimension MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antennas are being studied. In order to improve system networks for 5G communication systems, various technologies such as evolved small cells, advanced small cells, cloud radio access networks (Cloud-RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, moving networks, cooperative communication, coordinated multi-points (CoMP), and interference cancellation have been developed. In addition, for 5G communication systems, advanced coding modulation (ACM) technologies such as hybrid frequency-shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC), and advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) have been developed. The Internet has evolved from a human-based connection network, where humans create and consume information, to the Internet of things (IoT), where distributed elements such as objects exchange information with each other to process the information. Internet of everything (IoE) technology has emerged, in which the IoT technology is combined with, for example, technology for processing big data through connection with a cloud server. In order to implement the IoT, various technological elements such as sensing technology, wired/wireless communication and network infrastructures, service interface technology, and security technology are required, such that, in recent years, technologies related to sensor networks for connecting objects, machine-to-machine (M2M) communication, and machine-type communication (MTC) have been studied. In the IoT environment, intelligent Internet technology (IT) services may be provided to collect and analyze data obtained from connected objects to create new value in human life. As existing information technology (IT) and various industries converge and combine with each other, the IoT may be applied to various fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart home appliances, and advanced medical services. Accordingly, various attempts are being made to apply 5G communication systems to the IoT network. For example, technologies related to sensor networks, M2M communication, and MTC are being implemented by using 5G communication technology using beamforming, MIMO, and array antennas. Application of cloud radio access network (Cloud-RAN) as the above-described big data processing technology may be an example of convergence of 5G communication technology and IoT technology. In particular, according to the development of wireless communication systems, there is a demand for a method of efficiently indicating a beam failure recovery with respect to a special cell (SpCell). DESCRIPTION OF EMBODIMENTS Technical Problem The disclosure provides a method of indicating a beam failure recovery with respect to a cell. Solution to Problem According to embodiments of the disclosure, provided are an apparatus and method for efficiently providing a service in a wireless communication system. Advantageous Effects of Disclosure According to embodiments of the disclosure, provided are an apparatus and method for efficiently providing a service in a wireless communication system. BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a diagram illustrating a structure of a new radio (NR) system according to an embodiment of the disclosure. FIG. 1B is a diagram illustrating a radio protocol architecture of long term evolution (LTE) and NR systems according to an embodiment of the disclosure. FIG. 1C is a diagram illustrating a contention-based 4-step random access procedure performed by a UE with respect to a base station (BS) according to an embodiment of the disclosure. FIG. 1D is a diagram illustrating a 2-step random access procedure performed by a UE with