Provided is a technology capable of securing satisfactory communication quality. A communication system includes a user equipment, and a base station configured to be connected to the user equipment to perform radio communication with the user equipment. The user equipment performs radio communication with a beam. When the user equipment detects a beam disappearance state being a state incapable of maintaining communication quality with the base station, the user equipment transmits a notification of the beam disappearance state with a beam having a wider half width than a half width before detection of the beam disappearance state.

The present invention provides user equipment and a beam failure recovery method. The beam failure recovery method for user equipment (UE), includes: receiving indication of beam failure instance; accumulating the number of received indications so as to obtain an accumulative value; initiating a beam failure recovery procedure when the accumulative value is greater than a first threshold; and skipping processing the received indication of beam failure instance during the beam failure recovery period. Thus, it is possible to eliminate false beam failures.

There is provided a method comprising: determining channel condition for each of the plurality of beams; selecting, based on the channel conditions, a predetermined number of beams suitable for beam failure recovery; and determining the periodicity preference for each of the predetermined number of beams.

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.

A wireless communication method and a terminal device are provided, which are capable of both BFR and power saving of the terminal device. The method includes: transmitting, by a terminal device, first information to a network device, the first information being uplink information in a random access procedure triggered by Beam Failure Recovery (BFR); receiving, by the terminal device, first instruction information transmitted by the network device, the first instruction information instructing the terminal device to skip monitoring of Physical Downlink Control Channel (PDCCH); and determining, by the terminal device, whether to skip monitoring of PDCCH based on the first instruction information.

A method, a system, and an electronic apparatus for detecting failure of beamed signals can be applied in a user equipment. The method acquires a signal quality and determines whether such signal quality reaches a threshold value. If the signal quality is determined to be reaching the threshold value, determining whether the signal quality is continuously equal to or above the threshold value. If the signal quality parameter reaches the failure threshold value, determining that the beam occurred a wave beam failure.

Provided is a physical downlink control channel (PDCCH) monitoring method. Specifically, the method describes: a terminal device sending a scheduling request to a network device; the terminal device acquiring a monitoring indication message sent by the network device, wherein the monitoring indication message is used for indicating that PDCCH monitoring is skipped on a first serving cell set corresponding to the network device; and insofar as a response of the network device regarding the scheduling request is not received, the terminal device determining, according to acquired configuration information, that PDCCH monitoring is not skipped on a target serving cell in the first serving cell set indicated by the monitoring indication message. By means of the present application, the effects of ensuring the scheduling performance of a UE and also taking a power saving requirement of the UE into consideration are achieved.

A method performed by a terminal in a wireless communication system includes receiving, from a base station, a RRC reconfiguration message, identifying whether a beam failure is detected or whether a time alignment timer is running, based on the RRC reconfiguration message, and in case that the beam failure is not detected or the time alignment timer is running, identifying a SCG activation, without a random access procedure.

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for techniques for beam failure detection and recovery. A UE may support autonomous determination of a beam failure timer for a beam failure procedure, such as a beam failure detection (BFD) timer for a BFD procedure or a beam failure recovery (BFR) timer for a BFR procedure. For example, a network entity may transmit reference signals to the UE that are associated with the beam failure procedure. For instance, the UE may measure the reference signals as part of a BFD procedure or may initiate a BFR procedure in response to receiving the reference signals. The UE may determine a timer value for the beam failure timer using, for example, a machine learning (ML) model or a mapping and may perform the beam failure procedure in accordance with the UE-determined beam failure timer.

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for signaling mechanisms associated with reporting information associated with multiple beam failure indicator (BFI) types via a beam failure detection (BFD) report. In some aspects, a user equipment (UE) may measure a periodic reference signal as part of a BFD procedure and may report a BFI if the UE measures that the reference signal fails to satisfy a threshold signal strength or quality. The UE may further detect or classify each reported BFI as one of multiple BFI types and may store information associated with respective numbers of the multiple BFI types in accordance with the detection or classification. In scenarios in which the UE declares beam failure, the UE may transmit a BFD report including the information associated with the respective numbers of the multipole BFI types.