The present disclosure relates to a wireless communication system. Specifically, provided is a method and an apparatus for supporting same, the method comprising the steps of obtaining random access procedure-related message A, message A including a physical random access channel (PRACH) preamble and a physical uplink shared channel (PUSCH); transmitting message A; and receiving random access procedure-related message B as a response to message A, wherein the PUSCH comprises a demodulation reference signal (DM-RS), and PRACH preamble is mapped to (i) one or more DM-RS ports and (ii) one or more DM-RS sequences on the basis of indices of respective (i) one or more DM-RS ports and indices of respective (ii) one or more DM-RS sequences.

A terminal includes a control unit configured to perform LBT (Listen before talk) in a frequency band above a predetermined frequency, and a transmission unit configured to transmit a signal based on a result of the LBT, wherein the control unit performs the LBT with a mechanism different from LBT performed in a frequency band below the predetermined frequency.

There is provided, an open radio access network distributed unit (O-DU) having an electronic module that performs an FS-8 Radio Access Technology (RAT) functionality.

The technology of this application relates to a random access method, applied to the communication field. The method includes a terminal device sends, to a network device, a first message used to establish a wireless connection, the terminal device receives, a connection response sent by the network device, where the connection response includes information about a first polarization parameter, and when accessing the network device based on the connection response, the terminal device determines, based on the information about the first polarization parameter included in the connection response, whether the terminal device is qualified to access the network device. A dimension, namely, a polarization parameter, is introduced into a random access procedure, so that a preamble capacity is increased, a problem that the network device cannot identify a colliding terminal device is alleviated, and efficiency of establishing a communication connection between the terminal device and the network device is improved.

In response to initiating a two-step random access (RA) procedure, a wireless device selects a first radio resource for transmission of a first message of the two-step RA procedure. Based on the first radio resource being invalid for the transmission of the first message, the wireless device switches from the two-step RA procedure to a four-step RA procedure and transmits, via a second radio resource, a preamble for the four-step RA procedure.

A communication device for handling channel access in an unlicensed band comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise receiving an uplink (UL) grant from a network, wherein the UL grant indicates the communication device to perform an UL transmission in a transmission time interval (TTI); performing a listen-before-talk (LBT) procedure on a first carrier in response to the UL grant; and aborting the LBT procedure, when the communication device senses the first carrier to be busy before the TTI according to the LBT procedure.

A user equipment (UE) may receive, during release from a radio access network (RAN), resource information associated with attaching to the RAN, wherein the resource information is received based on the device being authenticated. The UE may store the resource information in a data structure associated with the UE, and may receive, when the UE includes a payload of data packets to transmit to the RAN, a signal from the RAN. The UE may determine, based on the signal, whether the RAN is a same RAN that provided the resource information, and may determine whether a strength of the signal from the RAN satisfies a threshold when the RAN is the same RAN that provided the resource information. The UE may attach to the RAN when the strength of the signal satisfies the threshold, and may provide the payload to the RAN via a random access channel of the RAN.

A method for coordinated communication and an apparatus for coordinated communication are provided. The method includes: a first access point (AP) sends an announcement message and/or a polling message to one or more second APs. The announcement message announces that the first AP may share a time resource of the first AP. The announcement message may further include identifier information that indicates the one or more second APs, and time information that indicate communication or channel contention of the one or more second APs in the time resource shared by the first AP. The polling message may be used to notify a second AP to start to use, at a preset time, a channel resource shared by the first AP with the second AP for communication or start channel contention at the preset time.

A user equipment for communicating with a base station apparatus is disclosed, the user equipment including a receiver that receives information related to random access; a processor that identifies, based on the information related to the random access, a first preamble format, a second preamble format, and random access channel resources; a transmitter that transmits a random access preamble using the random access channel resources, wherein the transmitter transmits the random access preamble using a last resource in a time domain of the random access channel resources and the second preamble format, and the transmitter transmits the random access preamble using a resource other than the last resource in the time domain and the first preamble format. In other aspects, a base station apparatus and a communication method are also disclosed.

An RO indication method and apparatus, an RO determination method and apparatus, a storage medium, a base station and a terminal are provided. The RO indication method includes: determining RO configuration information which includes at least one of followings: an association relation between ROs and corresponding frequency resources where the ROs are located respectively, and an association relation between ROs and corresponding available preambles; and transmitting the RO configuration information to a UE. By the embodiments of the present disclosure, a network is able to determine an RO of a UE without considering influence caused by a maximum difference time of RTT and increasing an average waiting time for the UE to transmit a preamble.