For contention free random access (CFRA) with 2-step RA type or 4-step RA type, a network node may configure different physical random access preamble configurations (e.g., different PRACH occasions, preamble index, or preamble format) for different user equipment (UE)/service groups that are associated with different UE priorities, UE types, service priorities, service types, and/or network slices. A UE may select a configuration to use to transmit the random access preamble based on the priority of the UE, the type of the UE, the priority of the service, the type of the service, and/or the network slice. In 2-step RACH, a network node may also configure different msgA PUSCH resources for different UE priorities, UE types, service priorities, service types, and/or network slices.

A method and a device for transmitting/receiving a signal in a wireless communication system, according to one embodiment of the present invention, receive random access channel (RACH) configurations, and transmit a random access preamble on a specific RACH occasion (RO) on the basis of the RACH configurations. The number of reference points in a cell is derived on the basis of the number of RACH configurations, and each of the reference points can have a first timing advance (TA) value for an RACH process.

The present invention is designed to establish synchronization between transmission points when downlink signals are transmitted from a plurality of transmission points to a user terminal. A radio communication system has a first radio base station that forms a first cell, a second radio base station that forms a second cell, which is placed on the area of the first cell in an overlapping manner, and a user terminal that is capable of carrying out radio communication with the first radio base station and the second radio base station, and the second radio base station has a receiving section that receives synchronization correction information, which is for establishing synchronization with a synchronization target, from the user terminal, and a synchronization correction section that corrects synchronization based on the synchronization correction information.

An uplink timing advance (TA) value processing method, apparatus, and a terminal are provided. The TA value processing method includes: applying a first TA value and/or a second TA value based on a preset processing mode after a random access procedure is triggered, where the first TA is configured by a network side device, the first TA is an uplink timing advance value corresponding to a first uplink resource, and the second TA value is an uplink timing advance value received in the random access procedure.

A user equipment in a wireless communication system may operate in different states, e.g. an idle state, an active/connected state, or an inactive state. Depending upon the state the UE is in, the UE may or may not have its uplink transmission synchronized with the uplink transmissions of other UEs. Mechanisms are disclosed for the UE to send a grant-free uplink transmission, even when the UE does not have its uplink transmission synchronized with the uplink transmissions from other UEs.

Provided is slot use control apparatus and method, including an access point (AP) to control a slotted channel access of a station (STA) in a wireless local area network (WLAN) includes generating a synchronization (synch) frame including an identification value indicating an STA allocated to a slot, and broadcasting the generated synch frame when a channel is in an idle state at a start point of the slot.

A multi-channel access control method of a V2X communication device is disclosed. The multi-channel access control method of a V2X communication device comprises the steps of: determining a multi-channel access interval for a service channel; and accessing a multi-channel on the basis of a synchronization interval and the multi-channel access interval.

This disclosure provides systems, methods, and apparatuses to enable a user equipment (UE) and a base station to improve reception of a random access response (RAR) by the UE in an unlicensed spectrum. A network may define a procedure for calculating a random access radio network temporary identifier (RA-RNTI) specific to unlicensed spectrum based on an extended RAR window. The calculation procedure may allow UEs transmitting in the window to calculate a unique RA-RNTI and identify a RAR addressed to the UE using the unique RA-RNTI. Additionally, or alternatively, a base station may transmit a RAR including timing information associated with a corresponding random access request. Accordingly, a UE may receive the RAR and compare the timing information with its own random access request in order to determine whether the RAR is addressed to the UE. Additionally, a UE may monitor a secondary cell or a sub-band for the RAR.

An efficient communication method and device for a Reduced-capability UE using a half-duplex communication scheme in a wireless communication system. According to an embodiment, a method for performing a random access procedure by a reduced-capability user equipment (UE) in a wireless communication system comprises receiving, from a base station, configuration information including resource information for random access by the Reduced-capability UE, identifying whether there is a random access occasion overlapping a radio frequency (RF) switching gap in a time domain when the random access is performed, and when there is the random access occasion overlapping the RF switching gap, performing the random access procedure with the base station on a next random access occasion except for the overlapping random access occasion, based on the received resource information for random access.

A UE receives an SSB having an SSB index and transmits a random access message using a PRACH resource based on a mapping to a number (X) of preamble sequences that are allocated for SSBs first in a sequence domain within a RO, second in a frequency domain RO within the single RB set, third in a time domain RO within a PRACH slot, and fourth within a PRACH slot domain within a time period. of preamble sequences that are allocated for SSBs first in an order first based on a sequence domain within a RO, second in a frequency domain of the RO within a single RB set, third in a time domain of one or more ROs within a PRACH slot, and fourth within a PRACH slot domain that is within a time period.