Methods, systems, and devices for wireless communications are described. In some examples, a base station may transmit, to a secondary user equipment (UE), a first grant to conditionally transmit one or more data messages over a first set of resources upon completion of a detection procedure. The detection procedure may include monitoring a second set of resources for over-the-air (OTA) signals transmitted by a primary UE pursuant to a second grant, where the first set of resources at least partially overlaps the second set of resources. The UE may monitor for the OTA signals from the primary UE, determine that one or more conditions for transmission of the one or more data messages have been satisfied, and transmit the one or more data messages over the first set of resources.

A wireless communication system includes a receiving apparatus and a transmitting apparatus. The transmitting apparatus includes a transmitting processing unit, configured to determine a wireless transmission channel on a first frequency band when in a first mode; a transmitting antenna unit, configured to transmit information of the wireless transmission channel and a channel state information of the wireless transmission channel on a second frequency band when in the first mode of the transmitting apparatus; and a wireless sensing unit, configured to perform a wireless sensing on the wireless transmission channel when in a second mode of the transmitting apparatus.

Embodiments provide efficient channel access utilizing a channel assessment mode and include determining that a predetermined condition exists on a radio bandwidth (e.g., unlicensed band); and, in response to determining that the predetermined condition exists on the radio bandwidth, initiating the channel assessment mode on the mobile device, where the channel assessment mode is configured to implement a channel assessment scheme configured for efficiently accessing a channel on the radio bandwidth. Some embodiments monitor the radio bandwidth for one or more triggering events indicative of interference; and detect at least one of the one or more triggering events indicative of interference on the radio bandwidth in order to determine the predetermined condition exists. These triggering events may include determining a current/historic packet collision probability is above a threshold, detecting signals that identify another radio access system, detecting a channel utilization ratio above a threshold, and determining a current/historic data throughput.

Disclosed are a method, an apparatus, and a system for transmitting a signal using multiple carriers. In detail, provided are a wireless communication apparatus including a communication module; and a processor, wherein the processor obtains a common back-off counter for a carrier set on which data is to be transmitted, wherein the carrier set includes at least one component carrier, performs back-off of each of the component carriers using the obtained common back-off counter, and simultaneously transmits data through at least one component carrier in which the back-off is completed and a wireless communication method using the same.

Apparatuses, systems, and methods for mitigation of listen before talk conflicts in the unlicensed spectrum. A wireless device may receive one or more synchronization signal blocks (SSBs) from a base station (BS) as part of a measurement procedure with listen before talk (LBT). The wireless device may determine one or more LBT failures associated with one or more receive beams of the wireless device. Furthermore, in response to determining the one or more LBT failures associated with the one or more receive beams of the wireless device, the wireless device may extend a measurement period for the one or more receive beams of the wireless device. The wireless device may then receive one or more additional SSBs on the one or more receive beams of the wireless device.

Example methods and apparatus for implementing collision detection in data transmission are described, One example method includes sending a data packet including collision detection information to a receive end, where the collision detection information is used by the receive end to perform collision detection on the data packet. A status indication message sent by the receive end is received by the receive end when sending the data packet. The receive end parses the status indication message. If the status indication message includes collision information, the receive end perform retransmission of the data packet.

A communication device includes a radio transceiver and a collision detection device. The radio transceiver is configured to receive a wireless signal which includes an acknowledgment packet from a wireless communication channel. The acknowledgment packet includes acknowledgment information which corresponds to a plurality of transmitted packets. The collision detection device is coupled to the radio transceiver and configured to receive the acknowledgment packet, determine whether collision has occurred in the wireless communication channel according to the acknowledgment information corresponding to the transmitted packets and accordingly generate a detection result. The collision detection device determines whether collision has occurred according to a distribution of the acknowledgment information having a predetermined acknowledgment status. When the collision detection device determines that the acknowledgment information having the predetermined acknowledgment status is concentrated in a section of the acknowledgment packet, the detection result indicates that collision has occurred.

The present disclosure provides a method and device for determining an uplink-downlink switching point. The method is used in a base station. The method includes: setting configuration information for determining an uplink-downlink switching point; and sending the configuration information to the terminal, so that the terminal determines the uplink-downlink switching point according to the configuration information. Therefore, the present disclosure can prevent the terminal from performing invalid detection on an unlicensed carrier, and can also improve the speed and accuracy of determining the uplink-downlink switching point by the terminal.

A method by which a terminal transmits feedback information comprises the steps of: determining, in predetermined resource units for receiving the broadcast information in a broadcast resource region, whether broadcast information collides; selecting a first shared resource in a shared resource region corresponding to a first broadcast resource in which the conflict occurs in the broadcast resource region, on the basis of a pre-defined mapping rule of the broadcast resource region and the shared resource region; and transmitting, in the selected first shared resource, feedback information including information on the occurrence of the collision, wherein the broadcast resource region is a resource region, which is defined so as to transmit or receive the broadcast information, and the shared resource region can be determined as a resource region shared between a plurality of terminals. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.

Provided are a transmission method and device, and a computer readable storage medium. The transmission method includes: receiving, by a terminal, indication information of a maximum transmission block size (TBS) supported by a data transmission, and determining the maximum TBS supported by the data transmission according to the indication information; and determining, by the terminal, a TBS supported by the data transmission according to the maximum TBS supported by the data transmission.