A data transmission method and a communication device are provided. Regarding the synchronization transmission of a plurality of transmission connections, in response to at least two of the plurality of transmission connections having different random backoff parameters, a frame length of a message frame transmitted by each transmission connection is determined based on a maximum random backoff parameter of the plurality of transmission connections.

Methods, systems, and devices are described for transmitting multiple repetitions of a random access shared channel message in multiple slots using beamformed wireless communications. A UE may determine transmission slots for one or more of the multiple repetitions of a random access shared channel message based on slots associated with random access occasions (ROs) that are mapped to an identified synchronization signal block (SSB), such as a SSB associated with a beam that is selected for communications by the UE. In cases where slots with ROs mapped to the identified SSB are not consecutively located, one or more slot offsets may be provided for transmitting the multiple repetitions of the random access shared channel message. Slot offsets may be explicitly indicated by a base station in a random access response message, or may be determined by the UE based on a mapping of SSBs to ROs.

A wireless communications system and a method for frequency multiplexing a first (LAA) OFDMA transmission and a second (Wi-Fi) OFDMA transmission on a shared radio channel spanning at least partly a common bandwidth. The system determines an unallocated frequency band available beside a first frequency band intended for a first transmission and sends a sharing request comprising information about the unallocated band. The system decides to use the unallocated band in a second frequency band in the shared channel. The system sends a legacy preamble and a first part of a Wi-Fi preamble spanning the shared channel. The first transmission is sent in the first band such that an end time point of the first part of the Wi-Fi preamble coincides with a start time point of the first transmission. Further, the system sends a second part of the Wi-Fi preamble and the second transmission in the second band.

A terminal in a wireless communication system is provided. The terminal includes a transceiver, and at least one processor configured to receive, from BS, a RRC reconfiguration message including a reconfiguration with synchronization, transmit, to the BS, a first message including a PRACH, a PUSCH, and a C-RNTI MAC CE based on the reconfiguration with synchronization, control the transceiver to receive, from the BS, a first PDCCH and a PDSCH, wherein: for the case when the BS receives the PRACH and does not receive the PUSCH, the first PDCCH is a PDCCH addressed to RA-RNTI and the PDSCH includes a fallback RAR; and for the case when the BS receives the PUSCH, the first PDCCH is a PDCCH addressed to a C-RNTI corresponding to the C-RNTI MAC CE and the PDSCH includes an absolute timing advance command MAC CE, determine that a RAR reception is successful based on the at least one of the fallback RAR or the PDSCH, when a DRX is configured for the terminal via a RRC signalling, determine that active time for the DRX includes a time while a second PDCCH indicating new transmission addressed to a C-RNTI corresponding to the C-RNTI MAC CE has not been received after determining that the RAR reception is successful, and monitor the second PDCCH during the active time.

The present disclosure provides a grant free uplink transmission method, the method is performed at a user equipment side, comprising: determining, according to configuration information for grant free uplink transmission received from a base station, a radio network temporary identifier GF-RNTI for grant free uplink transmission, and transmitting an uplink signal; and monitoring feedback from the base station in a downlink control channel by using the determined GF-RNTI. The present disclosure also provides a user equipment and a base station for grant free uplink transmission.

In a 802.11be multi-AP collaboration, collaborated BSSs obtaining shared resource from a collaborator AP. Co-channel interferences arise from misalignment of PHY preambles between the various collaborated and collaborator BSSs. This misalignment results from the independency of each BSSs during the shared TXOP. To overcome this deficient situation, a synchronization frame is sent by the collaborator AP at a predefined sync time over the shared frequency bands, even if the collaborator AP does not belong to the BSSs operating on these bands. The predefined sync time may derive from the UL Length field specified in the initial trigger frame. Consequently, all the stations are ready to receive the synchronization frame and therefore to start again their MU or P2P transmission a SIFS after the synchronization frame. PHY preambles in adjacent channels are therefore fully aligned.

The present disclosure relates to a transmission configuration method and terminal. The method includes: a terminal receives one or more synchronization signal blocks (SSBs) from a base station; the terminal detects one or more first SSBs that may trigger random access; and the terminal sends to a base station one or more first messages respectively corresponding to the one or more first SSBs and used to initiate random access such that the base station configures a transmission configuration indication (TCI) state set for a terminal according to the one or more first messages.

Performing a synchronization to allow a second wireless communication circuit of a wireless device operating in a second wireless communication network to operatively coexist with a first wireless communication network of the wireless device operating in a first wireless communication network in one or more wireless communication channels according to a time division multiplexing (TDM), wherein the method includes determining whether the one or more wireless communication channels are busy comprising determining whether a packet has been detected by the wireless device in the one or more wireless communication channels and/or determining whether the wireless device has sensed energy in the one or more wireless communication channels when one or more back-off counters associated TDM plan is zero; and granting to the second communication network, in response to determining the one or more wireless communication channels are busy, use of the one or more wireless communication channels.

The disclosure relates to a 5th generation (5G) or 6th generation (6G) communication system for supporting a data transmission rate higher than a 4th generation (4G) communication system such as long term evolution (LTE). A user equipment (UE) in a communication system is provided. The UE includes a transceiver, and a controller configured to receive, from a base station, system information including information related to transmission of a random access preamble, and to transmit, to the base station, a physical random access channel (PRACH) including the random access preamble. The PRACH includes at least one primary signal part including a first sequence for measuring a first delay within a symbol, and at least one secondary signal part including a second sequence for measuring a second delay in units of symbols, and a round trip delay (RTD) between the UE and the base station may be determined based on the first delay within the symbol and the second delay in units of symbols.

Methods, systems, and devices for wireless communications are described that provide for transmission of random access preambles from a UE based at least in part on a synchronization signal block (SSB) that is received from a base station. A random access response may be transmitted from the base station based at least in part on a random access resource that is used for the random access preamble, an SSB associated with the random access resource, an SSB index, or combinations thereof. In some cases, two or more SSBs may be mapped to a single random access resource, and a single random access radio network temporary identifier (RA-RNTI), or two or more RA-RNTIs, may be used for each of the two or more SSBs. In some cases, a single random access response message contains information for each UE that transmits a random access preamble in the single random access resource.