Disclosed are, according to various embodiments, a method for transmitting, by a user equipment (UE), a beam management signal in a wireless communication system supporting a sidelink, and an apparatus therefor. Disclosed are a method for transmitting, by a UE, a beam management signal in a wireless communication system supporting a sidelink, and an apparatus therefor, the method comprising the steps of: acquiring beam configuration information including information on a beam acquisition ID allocated to the UE; determining a first transmission interval from among a plurality of transmission intervals in which the beam management signal can be transmitted within a preset period; and transmitting the beam management signal in the first transmission interval, wherein a continuous interval index is allocated to each of the plurality of transmission intervals, and the first transmission interval supports a sidelink determined on the basis of the beam acquisition ID.

The present disclosure provides a method for performing radio link monitoring (RLM) by a terminal for which a plurality of carriers are configured, in a wireless communication system. Specifically, the method may comprise: receiving a reference signal through one carrier among the plurality of carriers: measuring the radio link quality of the one carrier on the basis of the reference signal, and determining whether wireless communication through the plurality of carriers is possible, on the basis of the measured radio link quality.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may establish an access link with a base station using one or more of a first beam or a first set of beams. The UE may therefore receive, via the access link, control signaling indicating a first configuration for a sidelink channel. In some examples, the UE may switch from the first configuration to a second configuration for the sidelink channel based on detection of an event for one or more of the first beam or the first set of beams and communicate with a second UE via the sidelink channel using the second configuration.

A sector sweep method includes a first communication apparatus transmitting a first frame on a first frequency domain resource or a second frequency domain resource, where the first frame includes information about M training sequences, and the M training sequences are used for a sector sweep on the second frequency domain resource. The first communication apparatus performs the sector sweep with the second communication apparatus on the second frequency domain resource based on the information about the M training sequences, where a frequency corresponding to the first frequency domain resource is less than a frequency corresponding to the second frequency domain resource. The first communication apparatus performs the sector sweep with the second communication apparatus by using a new sector sweep frame (namely, a training sequence).

Methods, systems, and devices for wireless communications are described. A transmitting device (such as a user equipment (UE)) may receive an indication of an allocation of resources for sidelink communication on a set of directional beams. The transmitting device may transmit, to a receiving device (e.g., base station), a capability of the transmitting device to support a beam change. In some examples, the transmitting device may identify a beam change condition for the set of directional beams based on a beam change condition configuration. In some cases, the beam change condition configuration may be based on the capability of the transmitting device. In some cases, the transmitting device may perform a resource reselection procedure for updating the allocation of resources for sidelink communication based on the beam change condition and the beam change condition configuration.

Certain aspects of the present disclosure to techniques for sidelink discovery in millimeter wave (e.g., Frequency Range 2 (FR2), or 24.25 GHz to 52.6 GHz) bands. For example, the disclosed techniques provides generating a sidelink discovery message including device information of the UE and non-device information. The sidelink discovery message is outputted for transmission. A sidelink connection with a receiver (Rx) UE can then be established after the output of the sidelink discovery message. Very often, beam training is required for FR2 communications. After beam sweep, the transmitter (Tx) UE and the Rx UE become aware of the primary beam directions and need to discover each other on a device level, by associating a beam pair link to a peer UE. As FR2 link often have high overhead to establish and maintain, the disclosed techniques enables device level and service level discovery using the discover message.

A method by which a terminal transmits a data channel in a wireless communication system is disclosed. Particularly, in the disclosure, a plurality of reference signals are transmitted through a plurality of transmission beams within a first frequency band, first information related to the reception quality of at least one reference signal from among the plurality of reference signals is received within a second frequency band, a transmission beam through which the data channel is to be transmitted is determined on the basis of the first information, and the data channel is transmitted through the transmission beam within the first frequency band, wherein the first frequency band is higher than the second frequency band.

Methods, systems, and devices for wireless communications are described. Wireless communications systems may support beam measurements triggered by a wake-up signal (WUS) and that triggers an active duration of a receiving user equipment (UE). The WUS may trigger the receiving UE to perform a beam sweeping procedure during a beam measurement occasion that immediately preceding the active duration, or the UE may perform the beam sweeping procedure in the WUS resource itself. A UE may perform beam measurement procedures during active durations of a discontinuous reception (DRX) cycle, or outside of active durations of the DRX cycle. A receiving UE may be configured with a timing for performing a beam measurement procedure based on one or more offset values. The timing offset values may indicate a timing during active durations or prior to active durations.

The subject application is related to a method and apparatus for Device-to-Device communication. A method for Device-to-Device communication includes transmitting a signal toward a group of user equipments (UEs); detecting a HARQ feedback signal accumulated by signal (s) from one or more UEs within the group of UEs; and transmitting a signal toward the group of UEs, wherein the UE and the group of UEs are configured to perform groupcast transmission.

One disclosure of the present specification provides an operation method in a vehicle-to-everything (V2X) device mounted on a vehicle. The method comprises the steps of: receiving a capability enquiry message from a base station; and transmitting capability information to the base station. The capability information includes information on whether a wireless link with the base station and a sidelink with a neighboring V2X device are supported through the same antenna. The method comprises a step of receiving, from the base station, information about a default beam set on the basis of the capability information.