TECHNICAL FIELD

The present invention relates to a wireless communication system, and more particularly, to a method for performing a beam failure recovery in a wireless communication system and an apparatus for supporting the same.

BACKGROUND ART

Mobile communication systems have been generally developed to provide voice services while guaranteeing user mobility. Such mobile communication systems have gradually expanded their coverage from voice services through data services up to high-speed data services. However, as current mobile communication systems suffer resource shortages and users demand even higher-speed services, development of more advanced mobile communication systems is needed.

The requirements of the next-generation mobile communication system may include supporting huge data traffic, a remarkable increase in the transfer rate of each user, the accommodation of a significantly increased number of connection devices, very low end-to-end latency, and high energy efficiency. To this end, various techniques, such as small cell enhancement, dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), supporting super-wide band, and device networking, have been researched.

DISCLOSURE

Technical Problem

An embodiment of this specification provides a method for identifying a new beam for a beam failure recovery.

Furthermore, an embodiment of this specification provides a method for configuring a resource for requesting a beam failure recovery.

The technical objects of the present invention are not limited to the aforementioned technical objects, and other technical objects, which are not mentioned above, will be apparently appreciated by a person having ordinary skill in the art from the following description.

Technical Solution

In this specification, a method for performing a beam failure recovery method by a UE in a wireless communication system includes: receiving, from a base station, control information related to a candidate beam configuration for the beam failure recovery, wherein the control information includes an RS set including reference signals (RSs) related to candidate beam identification and a threshold for the beam failure recovery; selecting an RS having a quality of the threshold or more among the RSs related to the candidate beam identification; and; transmitting, to the base station, a beam failure recovery request based on an uplink (UL) resource related to the selected RS.

Furthermore, in this specification, the UL resource is a resource related to a physical random access channel (PRACH).

Furthermore, in this specification, the UL resource is a physical random access channel (PRACH) preamble.

Furthermore, in this specification, the UR resource is a contention-free physical random access channel (PRACH) preamble.

Furthermore, in this specification, the RS set includes at least one of at least one synchronization signal (SS) block or at least one channel state information (CSI)-RS.

Furthermore, in this specification, the selected RS is the SS block.

Here, when the selected RS is the SS block, the UL resource associated with the selected RS is a UL resource corresponding to the SS block.

Furthermore, in this specification, the selected RS may be the CSI-RS and the UL resource is a UL resource corresponding to the SS block which is quasi-co located (QCL) with the CSI-RS.

Here, the SS block is an SS block QCL with the CSI-RS in terms of a spatial Rx parameter.

Here, the SS block is directly associated with the UL resource, and the CSI-RS is indirectly associated with the UL resource through a QCL association with the SS block.

Furthermore, in this specification, the quality is reference signal received power (RSRP).

Furthermore, in this specification, the UL resource is associated with one SS block and associated with one or more CSI-RSs.

Furthermore, in this specification, a method for performing a beam failure recovery by a base station in a wireless communication system includes: transmitting, to a UE, control information related to a candidate beam configuration for the beam failure recovery, wherein the control information includes an RS set including reference signals (RSs) related to candidate beam identification and a threshold for the beam failure recovery; and receiving, from UE, a beam failure recovery request based on an uplink (UL) resource related to a specific RS.

Furthermore, in this specification, the specific RS is an RS having a quality of the threshold or more among the RSs related to the candidate beam identification.

Furthermore, in this specification, a UE performing a beam failure recovery in a wireless communication system includes: a radio frequency (RF) module for transmitting and receiving a radio signal; and a processor functionally connected with the RF module, wherein the processor is configured to receive, from a base station, control information related to a candidate beam configuration for the beam failure recovery, wherein the control information includes an RS set including reference signals (RSs) related to candidate beam identification and a threshold for the beam failure recovery, select an RS having a quality of the threshold or more among the RSs related to the candidate beam identification, and transmit, to the base station, a beam failure recovery request based on an uplink (UL) resource related to the selected RS.

Advantageous Effects

This specification is advantageous in that a beam failure recovery procedure can be performed by designing a configuration for identifying a new beam and a resource for requesting a beam failure recovery when in case of beam failure.

Advantages which can be obtained in the present invention are not limited to the aforementioned effects and other unmentioned advantages will be clearly understood by those skilled in the art from the following description.

