According to an embodiment of the present invention a UE may receive a first system information block (SIB) including a system information (SI) request-related configuration including a physical random access channel configuration; transmit a random access (RA) preamble for an SI request based on the PRACH configuration; and receive, in response to the RA preamble, a second SIB different from the first SIB, wherein the SI request-related configuration may include first information related only to a first type UE with reduced capability to support a smaller bandwidth than a second type UE, and second information common for the first type UE and the second type UE, and the UE may be the first type UE and may perform the RA preamble transmission by determining an RA association period and an RA occasion based on both of the first information and the second information in the SI request-related configuration.

An example method for transmitting a random access preamble comprises selecting (502) a random access preamble configuration from a plurality of predetermined random access preamble configurations. The method further includes determining (504) a time interval in which to transmit the random access preamble. The method further comprises transmitting (506) the random access preamble according to the selected random access preamble configuration. Each of the plurality of random access preamble configurations comprises a combination of (a) a single root sequence from a predetermined set of one or more root sequences, (b) a single cyclic shift of a predetermined plurality of cyclic shifts for the root sequence, and (c) a single starting position of two or more predetermined starting positions within time intervals allocated for random access preamble transmission.

This document discloses a solution for detecting a transmission opportunity. According to an aspect, a method comprises as performed by an apparatus of a first wireless network: detecting a first transmission from a first apparatus of a second wireless network different from the first wireless network; transmitting, to a second apparatus of the first wireless network, a transmission mode request, wherein the transmission mode request indicates a request to transmit from the apparatus to the second apparatus at least during an interframe space of a transmission opportunity between the first apparatus and another apparatus of the second wireless network, receiving a transmission mode response from the second apparatus, wherein the transmission mode response indicates acceptance of the request; in response to detecting a second transmission from the first apparatus, transmitting a data frame during an interframe space following the second transmission.

A random access method, a base station, a user equipment, a device, and a medium are provided. The method includes: obtaining uplink transmission resources for sending a MSGA by a terminal side, wherein configuring the uplink transmission resources for sending the MSGA is performed by a network side, at least two uplink transmission resources exist, sizes of uplink data blocks transmitted on different uplink transmission resources are different; selecting one of the uplink transmission resources by the terminal side according to a size of a transmitted uplink data block; sending the MSGA to the network side by the terminal side on the selected uplink transmission resource; and sending MSGB by the network side after receiving the MSGA sent by the terminal.

Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of the adjustment of the Timing Advance (TA). The method comprises determining a channel occupancy time structure for accessing a radio channel between the first device and a second device, the channel occupancy time structure indicating a set of time-domain resources for accessing the radio channel; and setting a timing advance for a transmission from the first device to the second device based on the channel occupancy time structure. In this way, a dynamic adjustment of TA is allowed at the UE, which ensures that a desire duration of the gaps of the channel occupancy at different transmission scenarios.

A channel contention method includes performing, by a first station and a second station of a multi-link device (MLD), channel contention based on a first enhanced distributed channel access (EDCA) parameter; generating, by the first station and the second station, a point coordination function (PCF) inter-frame space (PIFS) access timer when the first station performs EDCA access and the second station performs PIFS access; and performing, by the first station and the second station, channel contention based on a second EDCA parameter before the PIFS access timer backs off to 0.

A random access method, a device, and a medium. The random access method includes: receiving configuration information, the configuration information being used to instruct to enable a back-off function of a random access process; and switching from a two-step random access to a four-step random access by a back-off in response to a synchronization signal and PBCH block (SSB) based random access meeting a target condition.

A wireless device (30) receives control information (28) that jointly encodes respective values for two or more channel access parameters. The two or more channel access parameters govern performance by the wireless device (30) of a listen-before-talk, LBT, procedure prior to an uplink transmission (32) in a radio resource allocation (34). In some embodiments, a mapping (40) maps different indices to different combinations of values for the two or more channel access parameters. In this case, the control information (28) may comprise an index mapped by the mapping (40) to one of the different combinations of values for the two or more channel access parameters. Regardless, the wireless device (30) may perform the LBT procedure (or not) according to the received control information (28).

Systems and methods for User Equipment (UE) operation in presence of Clear Channel Assessment (CCA) are provided. In some embodiments, a method performed by a wireless device for cell selection accounting for requirements includes: determining a measurement period in a serving cell for the cell selection or cell re-selection (T1), wherein the measurement period is determined based on a number of consecutive Discontinuous Reception (DRX) cycles; determining a number of measurement occasions configured with a Discovery Reference Signal (DRS) in the serving cell during T1; determining availability of the DRS at the measurement occasions; and performing measurement based on availability of the DRS at the measurement occasions during T1. In this way, a wireless device may operate in NR RRC_IDLE/RRC_INACTIVE in the presence of CCA, e.g., Listen-Before-Talk (LBT).

Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for a user equipment (UE) receiving, from a base station, one or more random access channel (RACH) configurations. The RACH configurations may allocate resources for a contention-based RACH procedure for accessing a wireless network. Based on the RACH configurations, the UE may determine a set of random access occasions for an association period. From the set of random access occasions, the UE may map one or more indices of a plurality of synchronization signal blocks to one or more random access occasions. Using the one or more random access occasions, the UE may transmit a random access sequence, including one or more repetitions of the random access sequence to the base station to access the wireless network.