Abstract: The present invention discloses a method and an apparatus for obtaining configuration information of a grant-free transmission unit. A centrally configured network element sends configuration information of a grant-free transmission unit of an access device to the access device, where the grant-free transmission unit refers to a transmission resource used for grant-free transmission, and the configuration information of the grant-free transmission unit includes at least one or more of the following information: information about the grant-free transmission unit or information about a grant-free transmission control mechanism. By using the method and the apparatus for obtaining configuration information of a grant-free transmission unit, an access device can obtain configuration information of a grant-free transmission unit.

Abstract: This application discloses a data transmission method, a feedback method, and a related apparatus. The method may include receiving, by a terminal device, feedback configuration information from a network device, where the feedback configuration information indicates a configuration of feedback information specific to uplink data of the terminal device. The method may also include sending, by the terminal device, the uplink data to the network device. Furthermore, the method may include determining, by the terminal device in a feedback message sent by the network device, the feedback information of the uplink data based on the feedback configuration information. In this application, signaling overheads and a transmission latency of data transmission can be reduced.

Abstract: This application discloses a method for repeated transmission and a terminal device. The method implemented by a terminal device includes: determining a transmission time unit used in the first transmission of to-be-transmitted data; determining, by the terminal device based on the determined transmission time unit and a parameter Q, a hybrid automatic repeat request HARQ process used to transmit the to-be-transmitted data, where Q is an integer greater than or equal to 1; and when repeated transmission of the to-be-transmitted data is not terminated before the first specific transmission time unit, performing, starting from the determined transmission unit, one transmission of the to-be-transmitted data in each transmission time unit by using the HARQ process until the last transmission of the to-be-transmitted data is performed in the first specific transmission time unit, where a period of the specific transmission time unit in a time domain resource is Q transmission time units.

Abstract: A parameter configuration method, a terminal device, a network side device, and a communications system are disclosed. The method includes: determining, by a network side device, a first transmission parameter and a second transmission parameter for a terminal device when the network side device needs to allocate a first-type transmission resource and a second-type transmission resource to the terminal device, where the first transmission parameter and the second transmission parameter meet a preset correspondence; generating, by the network side device, control information, where the control information includes first information, and the first information is used to indicate the first transmission parameter; and sending, by the network side device, the control information.

Abstract: Embodiments disclose an uplink data transmission method and apparatus. The method includes: determining M transmission areas allocated to a terminal device, and generating first information used to indicate the M transmission areas, where M is a positive integer, and the transmission area represents an air interface time-frequency resource that includes a time range and a frequency range that are specified by a communications system. The method also includes determining, for each transmission area of the M transmission areas, second information used to indicate a transport block size. The method also includes sending an indication message to the terminal device, so that the terminal device transmits uplink data according to the indication message, where the indication message includes the first information and the second information.

Abstract: Embodiments of the present invention provide a data transmission method and apparatus. The method includes: determining a contention transmission unit CTU to be used by to-be-sent uplink data, where the CTU is a transmission resource including at least a time domain resource, a frequency domain resource, and a code domain resource; encoding the to-be-sent uplink data by using N different code element groups in the code domain resource corresponding to the determined CTU, to obtain N groups of encoded data, where N is a positive integer greater than or equal to 2; and sending the N groups of encoded data by using the time domain and frequency domain resources that are corresponding to the determined CTU. According to the embodiments of the present invention, data reception reliability at a receive end can be improved.

Abstract: A scheduling information sending method and a network device are provided. The method implemented by a network device includes: attempting to receive data repeatedly transmitted in N consecutive transmission time units starting from a transmission time unit in which the network device detects for the first time the data transmitted by the UE, where N is an integer greater than or equal to 1 and less than or equal to K, and K is a maximum quantity of times that the UE repeatedly transmits the data; and sending scheduling information to the UE when the network device does not obtain correctly decoded data of the data in the N transmission time units, where the scheduling information includes information about a transmission resource used by the user equipment to retransmit the data, and the transmission resource includes at least one of a time resource and a frequency resource.

Abstract: This application provides a data transmission method and a related device. The method includes: when there is first data that needs to be sent in a current slot, determining grant-free resources corresponding to the current slot; determining a first HARQ process corresponding to a first grant-free resource in the grant-free resources; and sending, in the current slot, the first data to a second device on the first grant-free resource by using the first HARQ process. In this way, a data transmission latency can be reduced.

Abstract: Methods and systems for dynamically activate and deactivate an allocated resource for a UE to make grant-free uplink transmission are provided. In one embodiment, a user equipment (UE) receives a Radio Resource Control (RRC) signal. The RRC signal specifies grant-free (GF) configuration information. The GF configuration information comprises an activation field and at least one other GF resource configuration field. The activation field indicates whether the UE may perform GF uplink (UL) transmissions without waiting for a downlink control information (DCI) message. Then, the UE performs a GF UL transmission in accordance with the GF configuration information in the RRC signal.

Abstract: A data transmission method and apparatus for determining a transport block size, the method including obtaining, by a first device, a first parameter, where the first parameter is used to indicate a quantity of resource elements included in a resource mapping unit, determining, by the first device, a first transport block size based on the first parameter, and transmitting, by the first device, data based on the first transport block size.

Abstract: The present disclosure provides a pilot sequence transmission method and apparatus. A terminal device determines a first pilot number, determines a first pilot sequence and a second pilot sequence according to the first pilot number, respectively maps the first pilot sequence and the second pilot sequence to a first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol of a grant free transmission resource, and sends the first pilot sequence and the second pilot sequence by using the first OFDM symbol and the second OFDM symbol. Therefore, a network device can determine activeness of the terminal device by detecting the first pilot sequence, and can detect only the second pilot sequence corresponding to the first pilot sequence, and does not need to detect all possible second pilot sequences, so that a quantity of detected pilots can be significantly reduced, and pilot detection complexity is reduced.

Abstract: Embodiments provide a data retransmission method and a communications apparatus. The method includes: starting, by a transmit end, a timer before transmitting new data to a receive end, where a preset value of the timer is a maximum transmission latency corresponding to a service type of the data; retransmitting, by the transmit end, the data to the receive end when data needs to be retransmitted; transmitting, by the transmit end, the data to the receive end; and stopping sending, by the transmit end, retransmission data to the receive end when the timer expires, where the retransmission data is a part or all of the data. In this way, the following prior-art problem is avoided: Because a maximum retransmission quantity is not exhausted but a maximum transmission latency is exhausted, the transmit end still sends data, and consequently the receive end receives expiration data. This can avoid redundant transmission and save transmission resources.

Abstract: Embodiments provide a data transmission method and apparatus, and an information transmission method and apparatus. Under the data transmission method, obtaining time-frequency resources used to transmit first data can be obtained. Some or all of the time-frequency resources are used to transmit second data. A transmission parameter used to transmit the second data can also be obtained. A size of a to-be-encoded data block used to encode the first data can be determined based on the transmission parameter. The first data can be encoded based on the size of the to-be-encoded data block. A data block obtained through the encoding to the time-frequency resources can be mapped. In this way, interference caused by one type of data to another type of data can be reduced when same time-frequency resources are multiplexed for data transmission.

Abstract: A data transmission method and user equipment are provided. The method includes: after transmitting first data to a network device in a grant-free transmission mode, determining, by user equipment through listening, whether there is feedback information for the first data from the network device; determining, by the user equipment, based on the feedback information obtained through listening, a transmission mode used after the feedback information is obtained through listening; and transmitting, by the user equipment, data according to the used transmission mode.

Abstract: Embodiments disclose a method and an apparatus for transmitting indication information. The method includes: determining, according to one or more codebooks, a first codebook to be used by a terminal device to send an uplink data stream; determining codebook indication information used to indicate the first codebook; and determining codebook indication information used to indicate the first codebook. For the method and the apparatus for transmitting indication information according to embodiments of the present invention, a network device determines, according to one or more codebooks, a first codebook to be used by a terminal device to send an uplink data stream, determines codebook indication information used to indicate the first codebook, and sends the codebook indication information to the terminal device, so that the terminal device can determine the first codebook assigned by the network device and transmit data by using the first codebook.

Abstract: Example data transmission methods and apparatus are described. One example method includes obtaining at least two signature sequences used to perform multiple access for at least two to-be-sent data packets by a user equipment. The user equipment processes the at least two data packets by respectively using corresponding signature sequences, to obtain at least two transmit sequences. The user equipment sends the at least two transmit sequences to a network device on a same time-frequency resource. Then the network device obtains the at least two signature sequences used by the user equipment to send the at least two transmit sequences, and separately detects a corresponding transmit sequence based on each signature sequence, to obtain the at least two data packets. The user equipment can transmit a plurality of data packets on a same time-frequency resource in a same slot.

Abstract: The present invention discloses an indication information transmission method and apparatus. The method includes: determining, in one or more codebooks, a first codebook used to send a first downlink data stream to a terminal device; determining one or more second codebooks used to send a second downlink data stream; determining codebook indication information used to indicate the first codebook and the one or more second codebooks; and sending the codebook indication information to the terminal device.

Abstract: The present invention discloses an indication information transmission method and apparatus. The method includes determining a first signature sequence and a first modulation constellation that are used to transmit a first downlink data stream to a terminal device and determining one or more second signature sequences and one or more second modulation constellations that are used to transmit a second downlink data stream. The method also includes determining indication information that is used to indicate the first signature sequence, the first modulation constellation, the one or more second signature sequences, and the one or more second modulation constellations and transmitting the indication information to the terminal device.

Abstract: Embodiments of this application provide a data transmission method, a network device, and a terminal device. The method may include detecting, by a network device, a first signal in an uplink signal. The method may also include determining, by the network device, a signal structure of the uplink signal based on a result of detecting the first signal. Furthermore, the method may include receiving, by the network device, the uplink signal based on the signal structure, and/or responding to the uplink signal based on the signal structure. According to the data transmission method in the embodiments of this application, before receiving data, the network device can determine the signal structure, used by the terminal device, of the uplink signal, and then use a corresponding receiving method to avoid complexity and a reliability risk that are caused by completely blind detection performed by the network device, as well as to effectively reduce a delay and signaling overheads.

Abstract: This application provides an uplink transmission method, a terminal, and a network side device. The method includes: storing, by a terminal, an uplink transmission time-frequency resource allocated by a network side device; when the terminal needs to send an uplink signal, determining the to-be-transmitted uplink signal based on a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the uplink transmission time-frequency resource; and sending, by the terminal, the uplink signal to the network side device. During implementation of the uplink transmission method provided in this application, grant free transmission solutions are provided for different uplink transmission time-frequency resources, to effectively improve communication performance.