The present disclosure relates to data transmission methods, apparatus, and customer-premises equipment. In one example method, customer-premises equipment (CPE) receives a first downlink packet sent by a network device, stores the first downlink packet, and creates and maintains a context entry of the first downlink packet. The CPE sends the first downlink packet to a terminal. The CPE receives an acknowledgement packet sent by the terminal for the first downlink packet, and updates the context entry of the first downlink packet. In response to determining, based on the context entry of the first downlink packet, that the first downlink packet needs to be retransmitted, the CPE retransmits the stored first downlink packet to the terminal.

Provided are a method for a terminal resending data in a wireless communication system, and a communication device using same. The method comprises: receiving downlink control information (DCI) from a network; and resending data on the basis of the DCI, wherein the DCI includes an acknowledgement/not-acknowledgement (ACK/NACK) field.

Provided are a channel detection method and device and an information transmission method and device. The channel detection method comprises: a transmission device determining a CWS for channel detection according to first information, wherein the first information comprises feedback information corresponding to a reference physical channel and transmitted by the transmission device on an unlicensed carrier, and the feedback information comprises at least one of TB-HARQ information and CBG-HARQ information; and the transmission device performing channel detection on the unlicensed carrier according to the CWS.

Systems and methods presented herein provide for channel reservation for a wireless telephony system operating in an RF band with a wireless system comprising a conflicting wireless technology. One method is operable with an eNodeB. The method includes assigning an ID (e.g., a pseudorandom number sequence, or PN sequence) to a user equipment (UE) operating in the RF band, processing a scheduling request for uplink (UL) data from the UE, and granting a time and a frequency for the UE to transmit the UL data. The method also includes waiting until the UE performs a Listen Before Talk (LBT) operation to determine whether the granted time and frequency is occupied by another wireless system employing a different wireless technology. The method also includes transmitting the ID to the UE to reserve the granted time and frequency when unoccupied by the other wireless system, and processing the UL data from the UE.

A data processing method by a data sending apparatus is described. The method includes receiving a data packet from a PDCP layer, where the data packet is used as an RLC SDU. The method further includes encapsulating the RLC SDU into at least one RLC PDU, where each RLC PDU includes a header and a payload. The payload carries data from a single RLC SDU. It can be learned that a transmit end no longer performs concatenation processing at the RLC layer on the data packet. In this way, concatenation processing at the transmit end is reduced, and processing complexity and processing latency are further reduced. In addition, processing at a receive end also becomes simpler and more efficient.

A communications device acting as a relay device is configured to communicate with an infrastructure equipment of a mobile communications network and a receiving communications device operating with the mobile communications network. The communications device comprising a receiver configured to receive signals representing protocol data units formed from one or more service data units via a first wireless access interface from the infrastructure equipment according to a first automatic repeat request protocol for transmission to the receiving communications device, a transmitter configured to transmit signals representing the received protocol data units via a second wireless access interface to the receiving communications device according to a second automatic repeat request protocol, a controller configured to control the transmitter to transmit the signals and to control the receiver to receive the signals to transmit, and a buffer configured to store the protocol data units received by the receiver from the infrastructure equipment according to the first automatic repeat request protocol. The controller is configured in combination with the transmitter, the receiver and the buffer to transmit according to the second automatic repeat request protocol the protocol data units received from the infrastructure equipment from the buffer to the receiving communications device In embodiments of the present disclosure, upon receiving acknowledgement or negative acknowledgement signals from the receiving communications device, the communications device acting as the relay device may advance a sliding window of the buffer in order to clear space for the reception of future protocol data units. In embodiments of the present disclosure, the communications device acting as the relay device may, in response to a status request message from the infrastructure equipment, detect that one or more protocol data units have not been received, and transmit to the infrastructure equipment an indication of protocol data units which have therefore not been successfully received. Embodiments of the present technique may also include the relaying of signals on the uplink received by the communications device acting as the relay device from a transmitting communications device and relayed to the infrastructure equipment, or the device-to-device (D2D) relaying of signals between two communications devices.

Embodiments of the present disclosure provide a method and system for adjusting a physical uplink control channel (PUCCH) format in a wireless communication network. In particular, the method is implemented for adjusting a PUCCH format in an uplink transmission from a terminal device to a network device in a wireless communication network. The method comprises: using a first PUCCH format having a first duration for a service between the terminal device and the network device; and using (804) a second PUCCH format having a second and different duration for the service of the terminal device responsive to a determination that the first PUCCH format is in need of change based on one or more events.

Apparatuses, systems, and methods for performing contention window size updates for code block group based retransmission configurations in a wireless communication system. A code block group based wireless communication may be performed in unlicensed spectrum. A reference burst of the code block group based wireless communication may be identified. One or more of a number of acknowledgements or a number of negative acknowledgements associated with the reference burst may be identified. A contention window size adjustment may be determined based at least in part on one or more of the number of acknowledgements or the number of negative acknowledgements associated with the reference burst.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be configured to communicate with a base station on different channels or messages with different processing timelines. In order to prevent a collision between processing communications associated with the different length TTIs, the UE may drop one or more communications on corresponding channels with longer processing timelines to receive and/or process the transmission on the channel with a shorter processing timeline. Additionally, the UE may transmit uplink control information (UCI) for the one or more dropped communications, where the UCI may include hybrid access request (HARQ) acknowledgement/negative acknowledgement (ACK/NAK) feedback, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc. If a downlink transmission is dropped, the UE may transmit a NAK message. Alternatively, if an uplink transmission is dropped, the UE may transmit at least a portion of the UCI.

An operation method of a base station in a communication system includes transmitting, to a terminal, a radio resource control (RRC) message including transmission configuration information (TCI)-state configuration information including information indicating a starting beam index and an ending beam index and reference signal related information; transmitting, to the terminal, a first downlink control information (DCI) including a first TCI indicating the starting beam index and first resource allocation information; and transmitting, to the terminal, a first physical downlink shared channel (PDSCH) through a resource indicated by the first resource allocation information by using a starting beam indicated by the first TCI.