A terminal communicating with a base station by using an FDD cell and a TDD cell includes a reception unit that performs reception over a PDCCH transmitted using a DCI format. In a case where the TDD cell is configured as a primary cell for the terminal, a first uplink reference UL-DL configuration used for determining an interval between reception of the PDCCH indicating transmission of a PUSCH and the transmission of the PUSCH is configured for the TDD cell, and a second uplink reference UL-DL configuration used for determining whether or not to use DAI included in the DCI format of the PDCCH indicating the transmission of the PUSCH is configured for the FDD cell.

Methods and apparatuses are provided for a User Equipment (UE) to transmit an acknowledgement signal over multiple Transmission Time Intervals (TTIs). The method includes transmitting the acknowledgement signal in {(n+Q).sup.th, (n+Q+1).sup.th, . . . , (n+Q+N−1).sup.th} Transmission Time Intervals (TTIs), the acknowledgement signal corresponding to a data packet the UE receives in an n.sup.th TTI; and not transmitting a non-acknowledgement signal in the {(n+Q).sup.th, (n+Q+1).sup.th, . . . , (n+Q+N−1).sup.th} TTIs. n is an integer, Q is a number greater than 0, and N is a number greater than 1.

A communication apparatus includes a receiver and a decoder. The receiver includes a plurality of antenna elements and, in operation, receives from a base station apparatus a modulated signal mapped to one of a plurality of subframes defined in a frame corresponding to a communicable range to which the communication apparatus belongs. The plurality of subframes are defined by time-division, frequency-division, or time-and-frequency division of the frame. A maximum number of modulated signals that can be simultaneously transmitted in a subframe from the base station apparatus varies depending on the communicable range. The decoder, in operation, decodes the received modulated signal.

A communication apparatus includes a receiver and a decoder. The receiver includes a plurality of antenna elements and, in operation, receives from a base station apparatus a modulated signal mapped to one of a plurality of subframes defined in a frame corresponding to a communicable range to which the communication apparatus belongs. The plurality of subframes are defined by time-division, frequency-division, or time-and-frequency division of the frame. A maximum number of modulated signals that can be simultaneously transmitted in a subframe from the base station apparatus varies depending on the communicable range. The decoder, in operation, decodes the received modulated signal.

Messages are transmitted to a target device over a wireless network comprising a primary channel in which first messages are transmitted in a random access procedure, and a secondary channel in which second messages are transmitted using a dedicated access procedure, wherein each of the first messages comprises a pointer to the secondary channel, each first message comprising information about the transmitting device and the target device. For each of the first and second message, a transmission opportunity comprising a time slot for transmitting the corresponding message is selected and the primary channel is scanned to determine, based on the received first messages, whether a second message will be transmitted in the time slots selected for the first or second message in which the transmitting device or the target device is involved. The selected transmission opportunities are confirmed or amended based on a result of the scanning.

The present invention provides an uplink data receiving method and apparatus of wireless transceiver device. The method includes: obtaining a wireless channel state parameter of neighboring wireless transceiver device of the device; obtaining downlink data sent by the neighboring wireless transceiver device in a cross slot with the device; reestablishing an interference signal according to the wireless channel state parameter and the downlink data; and removing the interference signal from an uplink data signal received by the device. By reestablishing the interference signal of the neighboring wireless transceiver device on an uplink data signal received by the device in the cross slot, and removing the interference signal from the uplink data signal received by the device, cross slot interference may be eliminated without influencing the flexible allocation of a dynamic TDD system on wireless resources.

A system and method includes implementing, by a base station (BS), a reliable ultra-low latency transmission mechanism in a grant-free uplink transmission scheme having defined therein contention transmission unit (CTU) access regions and a plurality of CTUs. Implementing the reliable ultra-low latency transmission mechanism includes defining a reliable ultra-low latency CTU (RULL-CTU) access region from a portion of the CTU access regions of the grant-free transmission scheme, defining an RULL-CTU mapping scheme by mapping at least a portion of plurality of CTUs to the RULL-CTU access region to define a plurality of RULL-CTUs, defining a reliable ultra-low latency user equipment (RULL-UE) mapping scheme by defining rules for mapping a plurality of RULL-UEs to the plurality of RULL-CTUs in an initial pattern for initial transmissions in a first transmission time interval (TTI), and a regrouped pattern for redundant transmissions in a second TTI subsequent to the first TTI.

This application provides methods and apparatuses for sending a HARQ-ACK feedback codebook. One example method includes detecting DCI in a plurality of time units corresponding to at least one carrier, where a type of the DCI is a first DCI type or a second DCI type, where the first DCI is used to indicate to feed back CBG-level HARQ-ACK information for data scheduled by the first DCI, and where the second DCI is used to indicate to feed back TB-level HARQ-ACK information for data scheduled by the second DCI. A HARQ-ACK feedback codebook is then sent to a network device, where the codebook includes HARQ-ACK information of at least one piece of data scheduled by the DCI, and the HARQ-ACK feedback codebook is determined according to the type of the DCI and a type of the HARQ-ACK feedback codebook.

A method of a user equipment for performing TDD (Time Division Duplex) operation in a wireless communication system is discussed. The method according to one embodiment includes receiving RRC (radio resource control) signaling indicating whether or not a TDD subframe is being reconfigured; monitoring a PDCCH (Physical Downlink Control Chanel) related with reconfiguring the TDD subframe, if the RRC signaling indicates the TDD subframe is being reconfigured; and performing a TDD operation based on the PDCCH for the reconfiguring the TDD subframe, depending on whether a TDD uplink-downlink configuration indicates the TDD subframe is configured as a special subframe or not.

In the wireless communication system, each of a base station 11 and a terminal station 12 obtains its location information, and upon establishment of synchronization, the terminal station 12 transmits a terminal station free channel list and its location information by extremely low power wireless communication, and the base station 11 compares a base station free channel list created based on information from a database 40 with the terminal station free channel list from the terminal station 12, and determines, when there is a common free channel, the free channel as uplink/downlink channels and determines, when there is no common free channel, an uplink channel and a downlink channel as different channels, calculates a base station-terminal station distance from the location information of the base station 11 and the location information of the terminal station 12, and determines terminal station's uplink transmission power based on the distance.