The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. The disclosure relates to a wireless communication system. A system and a method of multi transmission and reception point (TRP) beam failure recovery for special cell (SpCell) and medium access control (MAC) control element (CE) prioritization are provided.

Aspects for MAC CE configurations for beam failure recovery operations are disclosed. In one aspect, a method of wireless communication comprising: determining, by a user equipment (UE), a beam failure recovery for a serving cell; transmitting, by the UE, a beam failure recovery request for the serving cell; and transmitting, by the UE, a MAC CE including new beam information and including serving cell identification information multiple serving cells, including the serving cell, wherein the serving cell identification information identifies the multiple serving cells. In another aspect, the MAC CE may include bandwidth part information. Other aspects and features are also claimed and described.

A method for operating a user equipment comprises receiving configuration information including information on a beam indication indicating N uplink (UL) transmit beams, where N>1; receiving the beam indication; determining whether an event is detected; selecting a beam from the N UL transmit beams based on whether the event is detected or not; and transmitting an UL transmission using the selected beam, wherein the beam refers to a spatial property used to receive or transmit a source reference signal (RS).

A beam failure recovery method and a terminal are provided. The method includes: in the case that a quality of a Beam Pair Link (BPL) employed in a current information transmission meets a preset beam failure trigger condition, transmitting to a network-side equipment a beam failure recovery request; in the case that a response signaling transmitted by the network-side equipment is not received within a preset time duration, continuing to transmit to the network-side equipment the beam failure recovery request; and in the case that information related to the beam failure recovery procedure meets a first preset condition, determining that the beam failure recovery is un successful.

Aspects described herein relate to configuring, at a device, default beam information for determining a beam for data channel communications. The device can determine to use the default beam information for configuring the beam for a data channel communication based on determining explicit beam information is not configured. In addition, the device can transmit, based on determining to use the default beam information, the data channel communication based on the beam configured using the default beam information.

A terminal apparatus configured with a first cell group and a second cell group includes a detector configured to detect a radio link failure of the first cell group, and a controller configured to initiate a first procedure for reporting the radio link failure of the first cell group. The first procedure is initiated based on transmission in the first cell group and the second cell group not being suspended, the second cell group not being in a first state, and the radio link failure of the first cell group being detected. The first state is a state in which a first BWP is activated in an SpCell of a corresponding cell group, a PDCCH is not monitored in the first BWP, and measurement of channel state information (CSI) for the first BWP is performed.

A UE may be configured to detect an occurrence of a beam failure condition for a failed downlink transmission received from a network entity using a first beam. The UE may transmit, over a sidelink to a second UE, a BFR in response to detecting the beam failure condition. The UE may receive, over the sidelink from the second UE or from the network entity, a beam switching instruction to switch from the first beam to a second beam. The UE may receive, from the network entity, a retransmission of the failed downlink transmission using the second beam.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). 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. The present invention relates to a method performed by a terminal in a wireless communication system. The method includes identifying a failure of connection with a primary cell (PCell) serving the terminal; storing cell level measurement information for the PCell and beam level measurement information for the PCell; transmitting, to a base station, a first message including an indicator indicating that reporting of information related to the connection failure is available; receiving, from the base station, a second message requesting the information related to the connection failure; and in response to the second message, transmitting, to the base station, a third message including the stored cell level measurement information and the stored beam level measurement information, wherein at least one measurement value for at least one reference signal related to the PCell is arranged in descending order and stored in the beam level measurement information.

An apparatus including: circuitry for receiving reference signals including a plurality of channel synchronization signal blocks and/or state information reference signals on a downlink channel; circuitry for measuring received signal power and/or quality level of said reference signals; circuitry for estimating arrival directions or an arrival antenna panel for a plurality of beams associated with said reference signals; circuitry for estimating, based on at least the received signal power and/or quality level, a required transmission power for a random access channel preamble for each beam; circuitry for selecting, in response to detecting a failure of a serving beam, another of said beams according to spatial diversity and/or required transmission power; and circuitry for sending the random access channel preamble on the selected beam.

A beam failure recovery method and apparatus, a terminal, and a storage medium, are provided. The method includes: triggering a beam failure event in a first condition; and sending a Beam Failure Recovery reQuest (BFRQ) in a case that the beam failure event occurs, where the first condition and/or the BFRQ are/is related to M Beam Failure Detection Reference Signal BFD RS groups, and M is a positive integer greater than 1.