Method and device for data transmission, radio access network device and terminal device

Abstract

This application provides a method for transmitting data and a device. The method includes: sending, via a radio access network device, a first transport block to a terminal device, where the first transport block includes at least two code blocks, at least two code blocks are divided into at least two different sets of code blocks based on a division method, and each set of code blocks includes at least one of the at least two code blocks; and receiving, by the radio access network device, the first feedback information sent by the terminal device, where the first feedback information includes at least two pieces of feedback information corresponding to the first transport block, and at least two pieces of feedback information are used respectively to indicate the reception status of at least two sets of code blocks.

Description

1 / 73 METHOD AND DEVICE FOR DATA TRANSMISSION, RADIO ACCESS NETWORK DEVICE AND TERMINAL DEVICE

[001] This application claims priority to Chinese Patent Application No. 201710170033.4, filed with the National Intellectual Property Administration of China on March 21, 2017, and entitled DATA TRANSMISSION METHOD AND APPARATUS, which claims priority to Chinese Patent Application No. 201710014619.1, filed with the National Intellectual Property Administration of China on January 7, 2017, and entitled DATA TRANSMISSION METHOD AND APPARATUS. All the aforementioned patent applications are incorporated herein by reference in their entirety. TECHNICAL FIELD

[002] The present invention relates to the field of mobile communications, and in particular, to a method and apparatus for data transmission. FUNDAMENTALS

[003] In an LTE (Long Term Evolution) system, a downlink and an uplink are, respectively, based on OFDM (Orthogonal Frequency Division Multiple Access) and SC-FDMA (Single carrier-Frequency Division Multiple Access). A time-frequency resource is divided into OFDM (Orthogonal Frequency Division Multiplexing) symbols or SC-FDMA symbols (an OFDM symbol or an SC-FDMA symbol is alternatively referred to as a time-domain symbol) in the time domain and subcarriers in the frequency domain. A minimum resource granularity into which the time-frequency resource is divided is referred to as a RE (Resource Element), i.e., a time-frequency grid point including a time-domain symbol in the time domain and a Petition 870260023484, dated 03 / 13 / 2026, page 11 / 183 2 / 73 Subcarrier in the frequency domain. A basic structure of a typical time-frequency resource in the LTE system is a subcarrier spacing of 15 kHz, a time-domain symbol duration of approximately 70 μs, and a cyclic prefix duration of 4 μs to 6 μs.

[004] In the LTE system, service transmission is based on scaling from a base station. When a higher-layer data packet is scaled at a physical layer, the higher-layer data packet is divided into smaller data packets in the form of Transport Blocks (TB). A basic scaling time unit is usually a subframe. The duration of a subframe is 1 ms, a subframe usually includes two intervals, and an interval usually includes seven time-domain symbols. In an evolved LTE system, a shorter scaling time unit may be introduced. For example, a scaling method in which an interval or even multiple time-domain symbols are used as a unit may be introduced.Generally, a specific scheduling process includes the following steps: A base station transmits a control channel, for example, a PDCCH (Physical Downlink Control Channel); the UE detects the control channel in a subframe, and receives a transport block from a downlink data channel or sends a transport block from an uplink data channel based on the scheduling information carried in the detected control channel. The control channel may carry scheduling information from a downlink data channel (for example, a Physical Downlink Shared Channel, PDSCH) or an uplink data channel (for example, a Physical Shared Uplink Shared Channel, PUSCH). The scheduling information includes control information, such as... Petition 870260023484, dated 03 / 13 / 2026, page 12 / 183 3 / 73 resource allocation information, a modulation and coding scheme, and a HARQ.

[005] The LTE system supports two duplexing modes: FDD (Frequency Division Duplex) and TDD (Time Division Duplex). For an FDD system, downlink transmission and uplink transmission are performed on different subcarriers. For a TDD system, uplink transmission and downlink transmission are performed on the same subcarrier at different times. Specifically, a subcarrier corresponds to a downlink subframe, an uplink subframe, and a special subframe. The special subframe includes three parts: a DwPTS (Downlink Pilot Timeslot), a GP (guard period), and an UpPTS (Uplink Pilot Timeslot).GP is primarily used to compensate for the transition time from downlink to uplink component and propagation delay. The LTE system currently supports seven different uplink and downlink TDD configurations, and for different uplink and downlink configurations, the ratios of uplink subframes to downlink subframes are typically different.

[006] In LTE, a HARQ mechanism is used, and the return of ACK or NACK and the retransmission of HARQ in the LTE system are performed based on a transport block. Using a downlink as an example, after receiving a transport block carried on a PDSCH, if the UE correctly receives the transport block, the UE returns an ACK on an uplink; or if the UE incorrectly receives the transport block, the UE returns a NACK on an uplink. If a Petition 870260023484, dated 03 / 13 / 2026, page 13 / 183 4 / 73 base station receives the NACK returned by the UE, the base station subsequently retransmits, to the UE, the transport block carried in a previous PDSCH transmission, and the UE can perform HARQ combination by receiving transport block information in the PDSCH received again and receiving transport block information that was previously incorrectly received, to improve reception performance.

[007] Currently, discussions about 5G (fifth generation) technology have begun. 5G can be divided into two branches from a compatibility perspective. One branch is continuous evolution compatible with LTE 4G (fourth generation), and the other branch is new NR radio incompatible with LTE. For both branches, 5G includes two important technical requirements: continuously improved mobile broadband eMBB (enhanced mobile broadband) and ultra-reliable and low-latency URLLC (ultra-reliable and low-latency communications). For eMBB, 5G needs to achieve a higher data rate than 4G. Therefore, a larger transport block may be introduced.Considering that a low-density parity-check code (LDPC) with a higher degree of parallelism can be introduced, compared to 4G, a TB in 5G is divided into more CBs (code blocks). For the URLLC, to meet its latency and reliability requirements, a burst transmission priority for the URLLC needs to be higher than that of the eMBB. Therefore, short-time punctures can be performed for the URLLC in an eMBB transport block being transmitted, and as a result, some CBs in the eMBB TB may not be correctly received by eMBB UE due to punctures for the URLLC.

[008] Therefore, in a 5G system project, a TB can be divided into more CBs, and the puncture can be performed for a Petition 870260023484, dated 03 / 13 / 2026, page 14 / 183 5 / 73 burst URLLC emergency service on an eMBB service that is being transmitted. In a conventional TB-based HARQ retransmission and return mechanism, data transmission efficiency is reduced, and system transmission efficiency is affected. SUMMARY

[009] This application discloses a method and apparatus for transmitting data, in order to provide a more efficient method of data transmission processing.

[0010] According to one aspect, an embodiment of the present invention provides a method of data transmission, including: To send, via a radio access network device, a first transport block to a terminal device, where the first transport block includes at least two code blocks, the at least two code blocks are divided into at least two different groups of code blocks based on a division method, and each group of code blocks includes at least one of the at least two code blocks; and to receive, by the radio access network device, the first return information sent by the terminal device, where the first return information includes at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate the reception status of the at least two groups of code blocks.

[0011] Optionally, the method also includes: sending, via the radio access network device, a retransmitted code block to the terminal device, where the retransmitted code block includes some or all of the code blocks included in a group of code blocks corresponding to negative acknowledgment information in the first return information; and receiving, via the radio access network device, Petition 870260023484, dated 03 / 13 / 2026, p. 15 / 183 6 / 73 the second return information sent by the terminal device, where the second return information includes return information that corresponds to the retransmitted code block and is used to indicate a received status.

[0012] Optionally, the method also includes: sending, via the radio access network device, retransmission indication information to the terminal device, where the retransmission indication information is used to determine the retransmitted code block.

[0013] Optionally, at least two code blocks occupy a first time-frequency resource, the first time-frequency resource includes at least two resource regions, the at least two resource regions correspond to at least two groups of code blocks, the code block included in each group of code blocks occupies a resource region corresponding to the code block's group of code blocks, and the splitting manner is one of the following plurality of splitting manners: at least the two resource regions are located in different time domains; at least two resource regions are located in different frequency domains; The time-domain and / or frequency-domain resources occupied by the at least two resource regions are not completely the same; and the at least two resource regions include at least one first-type region and at least one second-type region, the first-type region corresponds to a specific code block group, the second-type region does not correspond to the specific code block group, and the specific code block group belongs to at least both code block groups; or the at least two resource regions include at least Petition 870260023484, dated 03 / 13 / 2026, page 16 / 183 7 / 73 a first-type region and at least one second-type region, the first-type region supports transmission of a first-type service, and the second-type region does not support transmission of the first-type service.

[0014] Optionally, when at least two resource regions are located in different time domains, the amount of time domain resources occupied by the resource region at an earlier time is greater than the amount of time domain resources occupied by the resource region at a later time.

[0015] Optionally, the at least two groups of code blocks include a group of code blocks of the first type and a group of code blocks of the second type, and the group of code blocks of the first type and the group of code blocks of the second type include at least one of the same code block.

[0016] Optionally, when the radio access network device supports multiple splitting methods, the method also includes: To send, via the radio access network device to the terminal device, initial scheduling information used to schedule the first transport block, wherein the initial scheduling information includes a split indication, and the split indication is used to indicate one of the plurality of splitting methods; or to send, via the radio access network device, upper-layer signaling to the terminal device, wherein the upper-layer signaling includes a split indication, and the split indication is used to indicate one of the plurality of splitting methods.

[0017] Optionally, the method also includes: sending, via the radio access network device to the terminal device, a second scaling information used for Petition 870260023484, dated 03 / 13 / 2026, page 17 / 183 8 / 73 scale the retransmitted code block, where the second scaling information includes the retransmission indication information.

[0018] Optionally, the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in the downlink control information format and that is used by the split indication and a second field that is in the downlink control information format and that is used by the retransmission indication information include the same field.

[0019] Optionally, retransmission indication information is also used to indicate whether the HARQ combination can be executed on all or some code blocks in the retransmitted code block.

[0020] Optionally, the method also includes: The first return information still includes return information used to indicate a receipt status for the first transport block; and / or the second return information still includes return information used to indicate a receipt status for the first transport block.

[0021] According to another aspect, an embodiment of the present invention provides a method of data transmission, including: To receive, via a terminal device, a first transport block sent by a radio access network device, where the first transport block includes at least two code blocks, the at least two code blocks are divided into at least two different code block groups in a splitting manner, and each code block group includes at least one of the at least two code blocks; Petition 870260023484, dated 03 / 13 / 2026, p. 18 / 183 9 / 73 and The terminal device sends the first return information to the radio access network device, where the first return information includes at least two return information parts corresponding to the first transport block, and at least two return information parts indicate the reception status of at least two groups of code blocks.

[0022] Optionally, the method also includes: receiving, by the terminal device, a retransmitted code block sent by the radio access network device, where the retransmitted code block includes some or all of the code blocks included in a group of code blocks corresponding to negative acknowledgment information in the first return information; and sending, by the terminal device, second return information to the radio access network device, where the second return information includes return information that corresponds to the retransmitted code block and that is used to indicate a reception status.

[0023] Optionally, the method also includes: receiving, by the terminal device, retransmission indication information sent by the radio access network device, where the retransmission indication information is used to determine the retransmitted code block; and receiving, by the terminal device, the retransmitted code block based on the splitting method and the retransmission indication information.

[0024] Optionally, at least two code blocks occupy a first time-frequency resource, the first time-frequency resource includes at least two resource regions, the at least two resource regions correspond to at least two groups of code blocks, the code block included in each group of code blocks occupies a region of Petition 870260023484, dated 03 / 13 / 2026, p. 19 / 183 10 / 73 resources corresponding to the code block group, and the splitting method is one of the following plurality of splitting methods: at least the two resource regions are located in different time domains; at least two resource regions are located in different frequency domains; The time-domain and / or frequency-domain resources occupied by the at least two resource regions are not completely the same; and the at least two resource regions include at least one first-type region and at least one second-type region, the first-type region corresponds to a specific code block group, the second-type region does not correspond to the specific code block group, and the specific code block group belongs to at least both code block groups; or the at least two resource regions include at least one first-type region and at least one second-type region, the first-type region supports transmission of a first-type service, and the second-type region does not support transmission of the first-type service.

[0025] Optionally, when at least two resource regions are located in different time domains, the amount of time domain resources occupied by the resource region at an earlier time is greater than the amount of time domain resources occupied by the resource region at a later time.

[0026] Optionally, the at least two groups of code blocks include a group of code blocks of the first type and a group of code blocks of the second type, and the group of code blocks of the first type and the group of code blocks of the second type include at least one of the same block Petition 870260023484, dated 03 / 13 / 2026, page 20 / 183 11 / 73 code.

[0027] Optionally, when the radio access network device supports multiple splitting methods, the method also includes: To receive, by the terminal device, the first scheduling information that is sent by the radio access network device and that is used to schedule the first transport block, where the first scheduling information includes a split indication, and the split indication is used to indicate one of the plurality of splitting methods; or to receive, by the terminal device, upper-layer signaling sent by the radio access network device, where the upper-layer signaling includes a split indication, and the split indication is used to indicate one of the plurality of splitting methods.

[0028] Optionally, the method also includes: receiving, by the terminal device, a second scheduling information that is sent by the radio access network device and that is used to schedule the retransmitted code block, where the second scheduling information includes the retransmission indication information.

[0029] Optionally, the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in downlink control information format and that is used by the split indication and a second field that is in downlink control information format and that is used by the retransmission indication information include the same field.

[0030] Optionally, retransmission indication information is still used to indicate whether the HARQ combination can be executed in all or some code blocks in Petition 870260023484, dated 03 / 13 / 2026, p. 21 / 183 12 / 73 code block retransmitted.

[0031] Optionally, the first return information also includes return information used to indicate a receipt status of the first transport block; and / or the second return information also includes return information used to indicate a receipt status of the first transport block.

[0032] According to another aspect, one embodiment of the present invention provides a radio access network device, including: a processing unit, configured to split at least two code blocks included in a first transport block into at least two different code block groups based on a splitting method, where each code block group includes at least one of the at least two code blocks; a sending unit, configured to send the first transport block to a terminal device; and a receiving unit, configured to receive the first return information sent by the terminal device, where the first return information includes at least two return information parts corresponding to the first transport block, and the at least two return information parts are used respectively to indicate the reception status of at least two groups of code blocks.

[0033] Optionally, the transmitting unit is further configured to send a retransmitted code block to the terminal device, where the retransmitted code block includes some or all of the code blocks included in a code block corresponding to the negative acknowledgment information in the first return information; and the receiving unit is further configured to receive a second return information sent by the terminal device, where the second information Petition 870260023484, dated 03 / 13 / 2026, p. 22 / 183 Return 13 / 73 includes return information that corresponds to the retransmitted code block and is used to indicate a received status.

[0034] Optionally, the sending unit is further configured to send retransmission indication information to the terminal device, where the retransmission indication information is used to determine the retransmitted code block.

[0035] Optionally, at least two code blocks occupy a first time-frequency resource, the first time-frequency resource includes at least two resource regions, the at least two resource regions correspond to at least two groups of code blocks, the code block included in each group of code blocks occupies a resource region corresponding to the code block's group of code blocks, and the splitting manner is one of the following plurality of splitting manners: at least the two resource regions are located in different time domains; at least two resource regions are located in different frequency domains; The time-domain and / or frequency-domain resources occupied by the at least two resource regions are not completely the same; and the at least two resource regions include at least one region of the first type and at least one region of the second type, the region of the first type corresponds to a specific code block group, the region of the second type does not correspond to the specific code block group, and the specific code block group belongs to at least both code block groups; or the at least two resource regions include at least one region of the first type and at least one region of the second type. Petition 870260023484, dated 03 / 13 / 2026, page 23 / 183 In the 14 / 73 type, the first type region supports transmission of a first type service, and the second type region does not support transmission of a first type service.

[0036] Optionally, when at least two resource regions are located in different time domains, the amount of time domain resources occupied by the resource region at an earlier time is greater than the amount of time domain resources occupied by the resource region at a later time.

[0037] Optionally, the at least two groups of code blocks include a group of code blocks of the first type and a group of code blocks of the second type, and the group of code blocks of the first type and the group of code blocks of the second type include at least one of the same code block.

[0038] Optionally, when the radio access network device supports plurality of split ways, the transmitting unit is further configured to send to the terminal device the first scheduling information used to schedule the first transport block, where the first scheduling information includes a split indication, and the split indication is used to indicate one of the plurality of split ways; or the transmitting unit is further configured to send upper layer signaling to the terminal device, where the upper layer signaling includes a split indication, and the split indication is used to indicate one of the plurality of split ways.

[0039] Optionally, the sending unit is further configured to send to the terminal device the second scheduling information used to schedule the retransmitted code block, where the second scheduling information includes the retransmission indication information. Petition 870260023484, dated 03 / 13 / 2026, page 24 / 183 15 / 73

[0040] Optionally, the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in downlink control information format and that is used by the split indication and a second field that is in downlink control information format and that is used by the retransmission indication information include the same field.

[0041] Optionally, retransmission indication information is still used to indicate whether the HARQ combination can be executed on all or some code blocks in the retransmitted code block.

[0042] Optionally, the first return information also includes return information used to indicate a receipt status of the first transport block; and / or the second return information also includes return information used to indicate a receipt status of the first transport block.

[0043] According to yet another aspect, one embodiment of the present invention provides a terminal device, including: a receiving unit, configured to receive a first transport block sent by a radio access network device, where the first transport block includes at least two code blocks, the at least two code blocks are divided into at least two different code block groups based on a splitting method, and each code block group includes at least one of the at least two code blocks; a processing unit, configured to generate the first return information, where the first return information includes at least two pieces of return information. Petition 870260023484, dated 03 / 13 / 2026, page 25 / 183 16 / 73 corresponding to the first transport block, and the at least two return information pieces are used respectively to indicate reception status of the at least two groups of code blocks; and a transmission unit, configured to send the first return information to the radio access network device.

[0044] Optionally, the receiving unit is further configured to receive a retransmitted code block sent by the radio access network device, wherein the retransmitted code block includes some or all of the code blocks included in a code block group corresponding to negative acknowledgment information in the first return information; and the sending unit is further configured to send second return information to the radio access network device, wherein the second return information includes return information that corresponds to the retransmitted code block and that is used to indicate a reception status.

[0045] Optionally, the receiving unit is further configured to receive retransmission indication information sent by the radio access network device, where the retransmission indication information is used to determine the retransmitted code block; and the receiving unit receives the retransmitted code block based on the splitting method and the retransmission indication information.

[0046] Optionally, at least two code blocks occupy a first time-frequency resource, the first time-frequency resource includes at least two resource regions, the at least two resource regions correspond to at least two groups of code blocks, the code block included in each group of code blocks occupies a region of Petition 870260023484, dated 03 / 13 / 2026, page 26 / 183 17 / 73 resources corresponding to the code block group, and the splitting method is one of the following plurality of splitting methods: at least the two resource regions are located in different time domains; at least two resource regions are located in different frequency domains; The time-domain and / or frequency-domain resources occupied by the at least two resource regions are not completely the same; and the at least two resource regions include at least one first-type region and at least one second-type region, the first-type region corresponds to a specific code block group, the second-type region does not correspond to the specific code block group, and the specific code block group belongs to at least both code block groups; or the at least two resource regions include at least one first-type region and at least one second-type region, the first-type region supports transmission of a first-type service, and the second-type region does not support transmission of the first-type service.

[0047] Optionally, when at least two resource regions are located in different time domains, the amount of time domain resources occupied by the resource region at an earlier time is greater than the amount of time domain resources occupied by the resource region at a later time.

[0048] Optionally, the at least two groups of code blocks include a group of code blocks of the first type and a group of code blocks of the second type, and the group of code blocks of the first type and the group of code blocks of the second type include at least one of the same code blocks. Petition 870260023484, dated 03 / 13 / 2026, page 27 / 183 18 / 73 code.

[0049] Optionally, when the radio access network device supports plurality of splitting ways, the receiving unit is further configured to receive the first scheduling information sent by the radio access network device and which is used to schedule the first transport block, where the first scheduling information includes a split indication, and the split indication is used to indicate one of the plurality of splitting ways; or the receiving unit is further configured to receive upper layer signaling sent by the radio access network device, where the upper layer signaling includes a split indication, and the split indication is used to indicate one of the plurality of splitting ways.

[0050] Optionally, the receiving unit is further configured to receive second scheduling information that is sent by the radio access network device and which is used to schedule the retransmitted code block, where the second scheduling information includes the retransmission indication information.

[0051] Optionally, the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in downlink control information format and that is used by the split indication and a second field that is in downlink control information format and that is used by the retransmission indication information include the same field.

[0052] Optionally, retransmission indication information is still used to indicate whether the HARQ combination can be executed on all or some code blocks in the retransmitted code block. Petition 870260023484, dated 03 / 13 / 2026, p. 28 / 183 19 / 73

[0053] Optionally, the first return information also includes return information used to indicate a receipt status of the first transport block; and / or the second return information also includes return information used to indicate a receipt status of the first transport block.

[0054] According to yet another aspect, one embodiment of the present invention provides a communications system. The system includes the radio access network device and the terminal device in the preceding aspects.

[0055] According to another aspect, this application provides a computer-readable storage medium. The computer-readable storage medium stores an instruction and, when the instruction is executed on a computer, the computer executes the methods in the previous aspects.

[0056] According to yet another aspect, this application provides a computer program product, including an instruction. When the computer program product is run on a computer, the computer executes the methods in the preceding aspects.

[0057] According to the solutions presented in the present invention, because a transport block is divided into at least two different code block groups, the terminal device respectively returns reception status of at least two different code block groups, and the radio access network device can retransmit only one code block group that is not received correctly, so that HARQ retransmission of all code block groups in the transport block is avoided because some code block groups are incorrectly received, and data transmission efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS Petition 870260023484, dated 03 / 13 / 2026, p. 29 / 183 20 / 73

[0058] Figure 1 is a schematic diagram of a possible application scenario according to the present invention;

[0059] Figure 2(a) and Figure 2(b) are schematic diagrams showing that a transport block includes a plurality of code blocks;

[0060] Figure 3 is a schematic flowchart of one embodiment of a data transmission method according to the present invention;

[0061] Figure 4 is a schematic diagram of the division of a first time-frequency resource according to a time dimension according to an embodiment of the present invention;

[0062] Figure 5 is a schematic diagram of the division of a first time-frequency resource according to a frequency dimension according to an embodiment of the present invention;

[0063] Figure 6 is a schematic diagram of dividing a first time-frequency resource using a time-splitting method based on unequal duration according to an embodiment of the present invention;

[0064] Figure 7 is a schematic diagram showing that groups of different code blocks partially overlap according to an embodiment of the present invention;

[0065] Figure 8 is a schematic diagram showing that return information from different groups of code blocks is returned at different times according to an embodiment of the present invention;

[0066] Figure 9 is a schematic structural diagram of an embodiment of a radio access network device according to the present invention;

[0067] Figure 10 is a schematic structural diagram of another embodiment of a radio access network device according to the present invention; Petition 870260023484, dated 03 / 13 / 2026, page 30 / 183 21 / 73

[0068] Figure 11 is a schematic structural diagram of an embodiment of a terminal device according to the present invention; and

[0069] Figure 12 is a schematic structural diagram of another embodiment of a terminal device according to the present invention. DESCRIPTION OF THE MODALITIES

[0070] The following describes technical solutions in embodiments of the present invention with reference to the accompanying drawings.

[0071] Figure 1 shows a communications system 100 to which embodiments of the present invention are applied. The communications system 100 may include at least one radio access network device 110 and a plurality of terminal devices 120 located within the coverage of the radio access network device 110. Figure 1 shows one radio access network device and two terminal devices, which are used as an example. Optionally, the communications system 100 may include a plurality of radio access network devices, and the coverage of each radio access network device may include another number of terminal devices. This is not limited to embodiments of the present invention.

[0072] Optionally, the wireless communications system 100 may also include another network entity, such as a network controller or a mobility management entity. This is not limited to the embodiments of the present invention.

[0073] The communications system to which embodiments of the present invention are applied may be a Global System for Mobile Communication (GSM) system, a Code Division Multiple Access (CDMA) system, a system of Petition 870260023484, dated 03 / 13 / 2026, page 31 / 183 22 / 73 Wideband Code Division Multiple Access (WCDMA), a General Packet Radio Service (GPRS) system, a Long Term Evolution (LTE) system, a Frequency Division Duplex (FDD) system, a Time Division Duplex (TDD) system, a Universal Mobile Telecommunications System (UMTS) system, another wireless communications system using an orthogonal frequency division multiplexing (OFDM) technology is applied, or similar. A system architecture and a service scenario described in the embodiments of the present invention are intended to describe more clearly the technical solutions in the embodiments of the present invention, but are not intended to limit the technical solutions provided in the embodiments of the present invention.A person with normal knowledge of the subject will know that, as network architecture evolves and a new service scenario emerges, the technical solutions provided in the embodiments of the present invention are still applicable to a similar technical problem.

[0074] The radio access network device in the embodiments of the present invention can be configured to provide a wireless communication function to the terminal device. The radio access network device may include a macro base station, a micro base station (also referred to as a small cell), a relay station or an access point and the like in various forms. The radio access network device may be a base transceiver station (BTS) in GSM or CDMA, or it may be a Node B (NB) in WCDMA, or it may be an evolved Node B (eNB or e-Node B) in LTE, or it may be a corresponding gNB device in a 5G network. For ease of description, in all embodiments of the present invention, all devices Petition 870260023484, dated 03 / 13 / 2026, p. 32 / 183 23 / 73 previous devices that provide a wireless communication function for the terminal device are collectively referred to as radio access network devices.

[0075] In embodiments of the present invention, the terminal device may also be referred to as user equipment (UE), a mobile station (MS), a mobile terminal, or similar. The terminal device may communicate with one or more core networks via a Radio Access Network (RAN). For example, the terminal device may be a mobile phone (or referred to as a cellular phone) or a computer with a mobile terminal. For example, the terminal device may be a portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile device, and exchanges language and / or data with the radio access network. This is not specifically limited in embodiments of the present invention. [007 6] In the LTE system, ACK or NACK return and HARQ retransmission are performed based on a transport block. Considering the complexity of encoding and decoding and the advantages of fast encoding and decoding, a transport block (TB) can be divided into a plurality of code blocks (CBs) for separate channel encoding and decoding. For example, for a Turbo code, the number of bits in a larger CB is usually 6144. If the number of bits in a TB exceeds 6144, the TB needs to be divided into a plurality of CBs for separate encoding and decoding. For LDPC (Low-Density Parity-Check), the number of bits in a larger CB is approximately 2000. A TB can be divided into more CBs for parallel encoding and decoding. Generally, each CB has an independent verification function. Using the Turbo code as an example, a CB CRC Petition 870260023484, dated 03 / 13 / 2026, p. 33 / 183 24 / 73 (cyclic redundancy check) is added to each CB before encoding. This way, after the UE decodes each CB, it can be determined, through CRC verification, whether a current CB is correctly decoded. For LDPC, a CB CRC can also be added to each CB, or an LDPC encoding matrix has a verification function, meaning each LDPC CB has a verification function. Therefore, if some CBs in a TB are not received correctly, the UE returns a NACK to a base station, and the base station subsequently performs HARQ retransmission across the entire TB (including all CBs in the TB).

[0077] In a continuously evolving LTE system or an NR system, a TB can be split into more CBs. If a small number of CBs in the TB are not correctly received, but all other CBs are correctly received, the efficiency of HARQ return and retransmission based on conventional TBs will be reduced, and the system's transmission efficiency will be affected.

[0078] Furthermore, puncture can be performed for a burst URLLC emergency service on an eMBB service that is being transmitted. Compared with other CBs, a reception error occurs easily on a punctured CB, and if HARQ return and retransmission are still performed based on a TB, for example, all CBs on the TB are retransmitted, the system transmission efficiency is affected.

[0079] Furthermore, for retransmission of a punctured CB, because the UE cannot learn which CB is punctured for the URLLC during a previous transmission, the UE cannot correctly receive the TB in a HARQ matching manner. Therefore, when the UE returns a NACK, a UE HARQ buffer may store a URLLC service instead of a UE CB. As a result, when HARQ matching with the retransmitted CB is performed, a HARQ matching gain cannot be obtained. Petition 870260023484, dated 03 / 13 / 2026, page 34 / 183 25 / 73 and even CB cannot be received correctly. Finally, RLC layer retransmission may be triggered and, consequently, the system efficiency is significantly reduced.

[0080] To solve the previous problem, the base station configures a way of splitting a TB to the UE and sends the TB. Specifically, a way of splitting the TB into N CB groups (CBG) can be, for example, a splitting way based on a number of groups split, a splitting way according to a dimension (time domain and / or frequency domain or other dimension), or an equal group splitting way or an unequal group splitting way. The base station retransmits the TB or a CBG. The UE performs a CBG-based HARQACK return based on the previous splitting way of the TB.

[0081] The following embodiments are described by way of example wherein a basic scaling time unit is a subframe (e.g., duration is 1 ms, and this is not limited here). Other scaling granularity in the time domain is not excluded in the present invention. For example, interval-based or mini-interval-based scaling, i.e., scaling granularity with a specific duration less than or much less than 1 ms, is introduced.

[0082] Using a downlink as an example, a general baseband transmission process for a downlink transport block includes the following steps.

[0083] (1) Segment original payload information from a TB, i.e., divide the TB into a plurality of CBs according to a predefined rule (e.g., if a number of bits exceeds a specific value, the TB is divided into a plurality of CBs, otherwise there is no need to divide the TB).

[0084] (2) Add a CRC bit corresponding to each Petition 870260023484, dated 03 / 13 / 2026, p. 35 / 183 26 / 73 CB, that is, a CB CRC, for the CB payload, and add a CRC bit corresponding to all CBs, that is, a CRC TB, the payload including all CBs.

[0085] (3) Perform channel encoding separately, for example, Turbo or LDPC encoding, on each CB to which a CRC is added, to form a codeword. In a non-MIMO mode, the UE generally generates one codeword. In a MIMO mode, the UE can generate two codewords, i.e., original payload information in the two codewords is independent of each other. Unless otherwise specifically indicated in the present invention, it is assumed that the UE generates one codeword, and the solution can be directly extended to a case where the UE generates two codewords.

[0086] (4) Performs constellation encoding and modulation on the codeword, to form a modulation symbol. The encoding may be based on an initial state of a cell identifier and / or a UE identifier and a random or pseudorandom function. Constellation modulation usually includes QPSK, 16QAM, 64QAM, 256QAM and the like.

[0087] (5) Mapping the modulation symbol to physical time, frequency, and space resources. Specifically, to implement fast encoding and decoding, using the downlink as an example, the mapping of an encoded modulation symbol to a physical resource is performed first in the frequency domain and then in the time domain, and the inter-CB interleaving processing is not performed on the information obtained after the CBs are encoded independently, i.e., the mapping is performed on a sequence of CBs. An advantage of such a form is as follows: When the UE buffers a CB, the UE can start decoding and does not need to wait until all CBs in a data channel are buffered.

[0088] (6) Finally, performs the IDFT or IFFT conversion. Petition 870260023484, dated 03 / 13 / 2026, page 36 / 183 27 / 73 for the time domain and then executes the submission.

[0089] HARQ return and retransmission in a conventional LTE system are specific to a TB. Specifically, the UE returns an ACK bit only when the UE correctly receives all CBs on the TB (correctly receive in the present invention is a general description, and means that the original payload information is successfully decoded), or the UE returns a NACK bit to the TB even if a CB is not correctly received. After the base station receives the NACK return, because the base station does not know which CB is correctly received by the UE and which CB is incorrectly received by the UE, the base station can subsequently perform HARQ retransmission on all CBs on the TB even if the UE correctly receives most of the CBs.

[0090] The efficiency of HARQ return and retransmission based on TB in the conventional LTE system is not high. The description is provided with reference to Figure 2(a) and Figure 2(b) and the details are as follows:

[0091] (1) Channels and / or interference states of various regions of a time-frequency resource may be uncorrelated, or may have little correlation.

[0092] From a channel perspective, generally, the bandwidth of a wireless communication system is increasingly higher (currently, the maximum bandwidth of an LTE carrier is 20 MHz, and a carrier with higher bandwidth may be introduced in the future), and then channels of neighboring resources distant from each other in the frequency domain are not correlated, i.e., the resources are beyond the coverage of the related channel bandwidths. Thus, selective frequency domain fading of channels in frequency bands is independent. For example, as shown in Figure 2(a), a channel fading state of a frequency band of a CB 1 / 5 / 9 and similar is independent of a channel fading state of a band Petition 870260023484, dated 03 / 13 / 2026, page 37 / 183 28 / 73 frequency of a CB 2 / 6 / 10 and similar. Therefore, the two groups of CBs are independent of each other if both groups of CBs can be correctly received by the UE. A similar case can be extended to the time domain. For example, in Figure 2(b), a channel time-domain fading state of a CB 1 / 5 / 9 and similar can be independent of a channel time-domain fading state of a CB 13 / 17 / 21 and similar (assuming it is in a high-speed scenario).

[0093] From the point of view of interference, a neighboring cell can cause different interference in different frequency and / or time bands than a current cell, and similarly, reception correlations between CBs are different.

[0094] (2) In addition to the reception correlations between CBs being analyzed from the perspective of a channel and interference, the impact caused by URLLC burst transmission on eMBB data transmission still needs to be considered. For example, puncture is performed for URLLC data from the current cell on eMBB data, or short-time URLLC transmission from the neighboring cell causes short-time burst interference to the current cell. All of these affect the reception correlations between CBs.

[0095] Puncture means that when URLLC data transmission is mapped to a time-frequency resource, some resources of an eMBB data channel being transmitted are occupied by the URLLC data transmission. Thus, while a short delay requirement of a URLLC service is ensured, a performance loss is caused for the actual eMBB transmission; that is, a CB affected by puncture may not be correctly received by the UE. Besides puncture, there is another way in which URLLC data transmission does not replace eMBB data transmission. Instead, the base station performs both URLLC data transmission and eMBB data transmission. Petition 870260023484, dated 03 / 13 / 2026, page 38 / 183 29 / 73 eMBB data transmission. Thus, for URLLC, URLLC performance is lower than that obtained through puncture. However, for eMBB, because eMBB data is transmitted, a state is better than that affected by puncture. However, eMBB data transmission can receive interference from URLLC data transmission, and in this case, there is still a relatively high probability that the UE will not be able to correctly receive an affected eMBB CB.

[0096] Considering a problem that the system transmission efficiency (especially when a TB in the 5G system is split into more CBs than in 4G) is reduced when the reception performance of CBs is uncorrelated in the TB-based HARQ retransmission and return mechanism in the LTE system, CBG (code block group)-based splitting and a corresponding HARQ return and retransmission mechanism are introduced in the present application.

[0097] With reference to Figure 3, the present invention provides an embodiment of a data transmission method, including the following steps.

[0098] S301. A radio access network device sends a first transport block to a terminal device, where the first transport block includes at least two code blocks.

[0099] The at least two code blocks are divided into at least two different code block groups based on a splitting method, and each code block group includes at least one of the at least two code blocks.

[00100] Optionally, the radio access network device sends to the terminal device the first scheduling information and the first transport block, which is scheduled using the first scheduling information. Specifically, the first scheduling information can be carried on a control channel. The transport block TB Petition 870260023484, dated 03 / 13 / 2026, page 39 / 183 30 / 73 scaled using the first scaling information can be sent in the initial HARQ transmission, or it can be sent in a HARQ retransmission (in this case, the entire TB is retransmitted). The present invention is described using an example where the TB is sent in the initial HARQ transmission. Furthermore, the TB includes at least two CB code blocks. For example, the TB shown in Figure 2 includes 48 CBs.

[00101] S302. The terminal device receives the first transport block sent by the radio access network device.

[00102] Optionally, the terminal device receives the first transport block based on the first scheduling information. Specifically, the first scheduling information may include at least one control information corresponding to the first transport block, such as a modulation and encoding scheme, time-frequency resource allocation, and a HARQ process number.

[00103] Optionally, the terminal device obtains the splitting method of the first transport block. For example, the splitting method includes a number of CBGs into which the first transport block is split and which CB is included in each CBG. Specifically, the splitting method can be predefined in the standard, or it can be obtained by the terminal device receiving signaling configuration from the radio access network device. Alternatively, the splitting method can be a splitting method based on the logical sequence numbers of the CBs. For example, a CB 1 to a CB 12 forms a CBG 1, a CB 13 to a CB 24 forms a CBG 2, a CB 25 to a CB 36 forms a CBG 3, and a CB 37 to a CB 48 forms a CBG 4. Alternatively, the splitting method can be a splitting method based on a time-frequency resource occupied by the CBs in the first transport block, for example, a time-domain splitting method or a method of Petition 870260023484, dated 03 / 13 / 2026, page 40 / 183 31 / 73 frequency domain division.

[00104] S303. The terminal device generates first return information and sends the first return information to the radio access network device, where the first return information includes at least two return information parts corresponding to the first transport block, and the at least two return information parts are used, respectively, to indicate reception status of the at least two groups of code blocks.

[00105] The terminal device individually obtains the reception statuses of at least two groups of code blocks and sends the first return information to the radio access network device. The terminal device needs to individually obtain return information from each group of code blocks. When a group of code blocks is received correctly, the return information for the group of code blocks is an acknowledgment (ACK) information; or when a group of code blocks is not received correctly, the return information for the group of code blocks is a negative acknowledgment (NACK) information. The first return information includes the return information for all groups of code blocks in the first transport block.

[00106] Optionally, before sending the first return information, the terminal device needs to generate the first return information based on the previous splitting method. The splitting method based on the logical sequence numbers of the CBs is used as an example. The terminal device needs to generate ACK or NACK return information for each of the CBGs 1, 2, 3, and 4. For example, if all CBs in a CBG are correctly decoded, the return information corresponding to the CBG will be an ACK; or if at least one CB in the CBG is not correctly decoded, the return information corresponding to the CBG is a NACK. Petition 870260023484, dated 03 / 13 / 2026, page 41 / 183 32 / 73

[00107] S304. The radio access network device receives the first return information sent by the terminal device.

[00108] In this mode, because the transport block is divided into at least two different code block groups, the terminal device returns the reception statuses of at least two different code block groups, and the radio access network device can retransmit only one code block group that is not received correctly, so that the HARQ retransmission of all code block groups in the transport block caused because some code block groups are incorrectly received is avoided, and the data transmission efficiency is improved.

[00109] Optionally, the method in this mode may also include the following steps.

[00110] S305. The radio access network device sends a retransmitted code block and retransmission indication information to the terminal device, where the retransmitted code block includes some or all of the code blocks included in a code block group corresponding to negative acknowledgment information in the first return information.

[00111] If the first return information includes negative acknowledgment information from at least one first group of code blocks, the radio access network device sends the retransmitted code block to the terminal device, where the retransmitted code block includes some or all of the code blocks included in the first group of code blocks.

[00112] S306. The terminal device receives the retransmitted code block.

[00113] Specifically, unless otherwise indicated in Petition 870260023484, dated 03 / 13 / 2026, p. 42 / 183 33 / 73 of the present invention, reception is a general description. Reception may mean that specific information is received, or it may mean that information is received and the received information is decoded, demodulated, or similar. For example, if downlink data is received correctly, an ACK will be returned. Reception here actually includes that downlink data is received and the received downlink data is decoded correctly.

[00114] Optionally, the radio access network device sends to the terminal device the second scheduling information used to schedule the retransmitted code block, and the terminal device receives the second scheduling information, where the second scheduling information also includes a modulation and encoding scheme, resource allocation information, and the like from the retransmitted code block. The terminal device receives the retransmitted code block based on the second scheduling information.

[00115] S308. The terminal device generates a second return information, where the second return information includes return information indicating a reception status of the retransmitted code block.

[00116] The terminal device generates the second return information based on the reception status of the retransmitted code block. The terminal device obtains the reception status of the retransmitted code block and returns the second return information based on the reception status, that is, the second return information corresponds to a decoding status of the retransmitted code block. Specifically, if all code blocks in the retransmitted code block are correctly decoded, an ACK will be returned; or if at least one code block in the retransmitted code block is not correctly decoded, a NACK is returned. Petition 870260023484, dated 03 / 13 / 2026, page 43 / 183 34 / 73

[00117] S309. The terminal device sends the second return information to the radio access network device.

[00118] After receiving the second return information, the radio access network device determines whether the retransmitted code block needs to be retransmitted, based on whether the second return information includes negative acknowledgment information. Based on different states in the first received return information and the second return information, the radio access network device may perform retransmission, or may perform retransmission multiple times until the first transport block is correctly received by the terminal device.

[00119] Optionally, the method in this mode may also include the following step.

[00120] S307. The radio access network device sends the retransmission indication information to the terminal device, and the terminal device receives the retransmission indication information. The retransmission indication information is used to determine the retransmitted code block.

[00121] After the terminal device receives the retransmission indication information, in step S306, the terminal device receives and decodes the retransmitted code block based on the splitting method and the retransmission indication information.

[00122] The radio access network device can also send the retransmission indication information to the terminal device, where the retransmission indication information is used by the terminal device to determine the retransmitted code block based on the retransmission indication information.

[00123] Relay indication information may Petition 870260023484, dated 03 / 13 / 2026, p. 44 / 183 35 / 73 can be used to indicate a plurality of information pieces. For example, the retransmission indication information may include at least one of the following: first indication information, second indication information, third indication information, or fourth indication information. It should be noted that any identifying information that can indicate the retransmitted code block may form the retransmission indication information.

[00124] 1. The first indication information is used to indicate the group of code blocks corresponding to the retransmitted code block.

[00125] Specifically, it is considered that the at least two code blocks are divided into at least two different code block groups based on the division method, and the first return information corresponds separately to the divided code block groups, that is, the terminal device returns the first return information for each CBG or each code block group. Therefore, when the retransmitted code block is indicated, the retransmission indication information sent by the radio access network device can be used to indicate a specific code block group or CBG or several specific code block groups or CBGs corresponding to the retransmitted code block, and the return information corresponding to the indicated code block group or CBG is a NACK.

[00126] Optionally, the first indication information is used to indicate a time-frequency resource occupied by the group of code blocks corresponding to the retransmitted code block. Specifically, the terminal device determines, based on the first indication information, a portion of the time-frequency resource in a transport block time-frequency resource occupied by the first transport block, where the portion of the time-frequency resource is a Petition 870260023484, dated 03 / 13 / 2026, p. 45 / 183 36 / 73 time-frequency resource occupied by a specific CBG(s) or set(s) of code blocks. From another perspective, in this case, it is equivalent to dividing the transport block time-frequency resource occupied by the first transport block into a plurality of time-frequency resources, and each sub-time-frequency resource is a time-frequency resource occupied by each group of code blocks or CBGs.

[00127] 2. The second piece of information is used to indicate an identifier, location, or sequence number of the code block retransmitted in the first transport block.

[00128] Specifically, the second piece of information indicates a specific code block or several specific code blocks in the first transport block as the retransmitted code block, for example, it indicates the sequence number, location or identifier of the retransmitted code block in the first transport block.

[00129] 3. The third piece of information used to indicate that the retransmitted code block includes all or some of the code blocks in the first transport block.

[00130] Specifically, it is equivalent to the third indication being used to indicate, within a group of retransmission modes, a mode in which some code blocks are retransmitted, and the group of retransmission modes includes a mode in which all code blocks are retransmitted and a mode in which some code blocks are retransmitted. If the mode in which all code blocks are retransmitted is indicated, it is equivalent to the entire first transport block being retransmitted. If the mode in which some code blocks are retransmitted is indicated in this case, it is equivalent to some code blocks in the first transport block being retransmitted. The terminal device then needs to determine which CBG or group of code blocks is Petition 870260023484, dated 03 / 13 / 2026, p. 46 / 183 37 / 73 retransmitted in this case. The retransmitted CBG or code block group may specifically be a code block group or CBG corresponding to the NACK information in the first return information.

[00131] 4. The fourth indication information is used to indicate the retransmission of HARQ corresponding to all or some of the code block groups in at least two different code block groups.

[00132] Specifically, it is equivalent to the fourth indication information being used to indicate a HARQ retransmission mode within a group of HARQ transmission modes, and the group of HARQ transmission modes includes an initial HARQ transmission mode and the HARQ retransmission mode. Optionally, a new data indicator or NDI (New Data Indicator) in the scheduling information or an NDI and a HARQ process number may be used for indication. If a state of an NDI changes relative to a previous NDI (changes from 0 to 1), the initial HARQ transmission mode is indicated in this case, and in that case, it is equivalent to a previous transport block being received correctly. Alternatively, if a state of an NDI does not change relative to a previous NDI (for example, a previous NDI state is 0 and a current NDI state is also 0), the HARQ retransmission mode is indicated.Next, the terminal device needs to continue determining which CBG or code block group is retransmitted in this case. The retransmitted CBG or code block group can specifically be a code block group or CBG corresponding to the NACK information in the first return information.

[00133] In addition, step 306 includes the following specific steps: Before receiving or decoding the retransmitted code block, the terminal device must first determine a CBG(s) or set(s) of code blocks in which Petition 870260023484, dated 03 / 13 / 2026, p. 47 / 183 38 / 73 the retransmitted code block is located and, specifically, needs to determine the retransmitted code block based on the previous splitting method, i.e., the splitting of the retransmitted code block is different for different splitting methods; and also needs to determine the retransmitted code block based on the retransmission indication information. For more details, see the descriptions of the following plurality of indication information parts.

[00134] When the retransmission indication information includes different information, the terminal device receives the retransmitted code block in different ways.

[00135] When the retransmission indication information includes the first indication information, the terminal device determines the first group of code blocks in at least two different groups of code blocks based on the splitting method and the retransmission indication information, where the retransmitted code block belongs to the first group of code blocks, and the return information that corresponds to a reception status of the first group of code blocks and that is in the first return information is negative acknowledgment information. Specifically, the retransmission indication information may indicate a sequence number of the first group of code blocks, or it may indicate a time-frequency resource occupied by the first group of code blocks.

[00136] When the retransmission indication information includes the second indication information, the terminal device determines a specific code block or some specific code blocks in the first transport block based on the splitting method and the retransmission indication information, and uses the determined specific code block or the determined specific code blocks as the retransmitted code block. For example, a sequence number, a Petition 870260023484, dated 03 / 13 / 2026, p. 48 / 183 39 / 73 location or an identifier of the code block retransmitted in the first transport block is specifically indicated.

[00137] When the retransmission indication information includes the third indication information, the terminal device determines, from the retransmission mode group based on the splitting method and the retransmission indication information, the mode in which some code blocks are retransmitted, where the retransmission mode group includes the mode in which some code blocks are retransmitted and the mode in which all code blocks are retransmitted. The terminal device determines, based on the splitting method, a second group of code blocks whose reception status corresponds to the negative acknowledgment return information in the first return information, where the retransmitted code block belongs to the second group of code blocks.

[00138] When the retransmission indication information includes the fourth indication information, the terminal device determines the HARQ retransmission mode from the HARQ transmission mode group based on the retransmission indication information, where the HARQ transmission mode group includes the HARQ retransmission mode and the initial HARQ transmission mode. The terminal device determines, based on the splitting method, a third group of code blocks whose reception status corresponds to the negative acknowledgment return information in the first return information, where the retransmitted code block belongs to the third group of code blocks.

[00139] In this mode, when a TB includes a large number of CBs, according to HARQ return and retransmission based on CBG, the radio access network device can retransmit to the terminal device only a group of code blocks that is not received correctly, so that the Petition 870260023484, dated 03 / 13 / 2026, p. 49 / 183 40 / 73 retransmission of HARQ of all CBs across the entire TB caused because a small number of CBs are received incorrectly is avoided, data transmission efficiency is improved, and system transmission efficiency is improved.

[00140] The following describes the method of dividing the first transport block in the previous mode.

[00141] The code blocks in the first transport block can be divided in a plurality of ways: 1. In one way, the code blocks in the first transport block can be logically divided based on the logical sequence numbers of the CBs. 2. Alternatively, the code blocks in the first transport block can be divided based on the time-frequency resources occupied by the CBs.

[00142] The splitting method based on the resources occupied by code blocks may include a plurality of methods. Optionally, at least two code blocks occupy a first time-frequency resource, the first time-frequency resource includes at least two resource regions, the at least two resource regions correspond to at least two groups of code blocks, the code block included in each group of code blocks occupies a resource region corresponding to the code block's group of code blocks, and the splitting method is one of the following plurality of splitting methods: at least the two resource regions are located in different time domains; at least two resource regions are located in different frequency domains; The time-domain and / or frequency-domain resources occupied by at least the two resource regions are not completely identical; and the at least two resource regions include at least one first-type region and at least one second-type region. Petition 870260023484, dated 03 / 13 / 2026, page 50 / 183 41 / 73 type, the first type region corresponds to a specific code block group, the second type region does not correspond to the specific code block group, and the specific code block group belongs to at least two code block groups; or the at least two resource regions include at least one first type region and at least one second type region, the first type region supports transmission of a first type service, and the second type region does not support transmission of the first type service.

[00143] Optionally, several specific candidate splitting methods are provided. As shown in Figure 4 and Figure 5, the first time-frequency feature is split according to a time dimension and a frequency dimension, respectively.

[00144] With reference to Figure 4, the at least two resource regions are located in different time domains. In one implementation, for example, a first TB includes 48 CBs numbered from 1 to 48. The time-frequency resources occupied by the 48 CBs are divided, according to a time dimension, into resources occupied by four CBGs: resources occupied by CB 1 to CB 12, resources occupied by CB 13 to CB 24, resources occupied by CB 25 to CB 36, and resources occupied by CB 37 to CB 48. Referring to Figure 5, the at least two resource regions are located in different frequency domains. In another implementation, for example, the first TB includes 48 CBs numbered from 1 to 48.The time-frequency resources occupied by the 48 CBs are divided, according to a frequency dimension, into resources occupied by four CBGs: resources occupied by CBs {1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45}, resources occupied by CBs {2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46}, resources occupied by CBs {3, 7, 11, 15, 19, 23, 27, 31, 35, 39, 43, 47} and resources occupied by... Petition 870260023484, dated 03 / 13 / 2026, page 51 / 183 42 / 73 CBs {4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48}. Furthermore, a method of division according to a time dimension and a frequency dimension is similar to that, that is, it is a combination of the method of division according to a time dimension and the method of division according to a frequency dimension.

[00145] Furthermore, another method of division can be additionally introduced in the present invention for a scenario of reusing eMBB and URLLC resources. Corresponding to a given group of code blocks and another group of code blocks, different from the specific group of code blocks, in at least two groups of code blocks, in another implementation, the specific CBG includes a CB punched for URLLC or interfered with by URLLC. For example, CBs 17 to 20 are punched for URLLC. Then, the punched CBs belong to the group of code blocks or CBG including CB 13 to CB 24, and the other group of code blocks different from the specific group of code blocks is the other three CBGs or groups of code blocks.

[00146] For the method of division according to a time dimension, to reduce a return delay, a method of time division based on unequal duration can be used, and a time resource occupied by a CB sent at an earlier time can be sequentially larger than a time resource occupied by a CB that is sent later. Referring to Figure 6, in one implementation, the first TB is divided into three CBGs or groups of code blocks: {CB 1 to CB 20, CB 21 to CB 36, CB 37 to CB 48} or {resources occupied by CB 1 to CB 20, resources occupied by CB 21 to CB 36, resources occupied by CB 37 to CB 48}. Furthermore, to reduce the impact on the eMBB caused by the puncture, inter-CB interleaving can be introduced in each element; for example, interleaving is performed in CB 1 to CB 20 in five time-domain symbols occupied by CB 1 to CB 20. Petition 870260023484, dated 03 / 13 / 2026, page 52 / 183 43 / 73 CB 20. In this way, the impact caused by the puncture can be shared among the 20 CBs.

[00147] In addition to reducing the impact of a puncture, advantages of combining the unequal duration-based division method and the inter-CB interleaving method in an element can also include that a CB that is sent first and occupies a relatively long time can be buffered first and then decoded first, and a CB that is sent later and occupies a relatively short time can be buffered later and then decoded later. Because a relatively long decoding processing time is reserved for a CB that occupies a lot of time, and a relatively short decoding processing time is reserved for a CB that occupies little time, a HARQ return delay can be reduced, and the system transmission efficiency can be improved.

[00148] In the previous division method, considering that the mapping is performed for a plurality of CBs first by frequency and then by time, there may be a case where a feature occupied by a CB crosses different time-domain symbols, and possibly crosses inter-element features. Referring to Figure 7, it is assumed that the first TB is divided into 12 CBGs or code block groups, corresponding respectively to 12 time-domain symbols. Then, it can be learned that CB 4 belongs to both a first CBG and a second CBG, that is, CB 4 is a common CB between a CBG {CBs 1, 2, 3, 4} and a CBG {CBs 4, 5, 6, 7}. A common CB solution is also applicable to another division method.

[00149] Optionally, when the radio access network device supports multiple splitting methods, the method in this mode may also include: sending, via the radio access network device, a split indication to the terminal device, where the split indication is Petition 870260023484, dated 03 / 13 / 2026, page 53 / 183 44 / 73 is used to indicate one of the plurality of ways of dividing; and to receive, by the terminal device, the division indication and obtain a division method corresponding to the division indication.

[00150] In one way, the split indication can be performed in the first scaling information. In another way, the split indication can be performed in upper layer signaling.

[00151] The radio access network device can notify the terminal device of a specific current split mode using RRC signaling.

[00152] Optionally, the radio access network device can notify the terminal device of the current specific split mode using physical layer signaling, for example, using a PDCCH, or the split indication is directly ported in the first scheduling information. Additionally, the terminal device can directly determine the current specific split mode based on the split indication, or the terminal device can determine the current specific split mode based on the split indication and a predefined rule. For example, the split indication is split based on a number of bits in a current TB or on a number of time-frequency resources occupied by all CBs in a current TB.A specific splitting method might be, for example: when there is a relatively small number of bits in the TB or a relatively small number of resources occupied, the granularity of the splitting indication is relatively small; or when there is a relatively large number of bits in the TB or a relatively large number of resources occupied, the granularity of the splitting indication is relatively large.

[00153] Optionally, the network access device of Petition 870260023484, dated 03 / 13 / 2026, page 54 / 183 45 / 73 radio can notify the terminal device of a specific current split way using physical layer signaling and RRC signaling. Specifically, firstly, a number of split ways is configured for the terminal device using RRC signaling, and then a split way is determined from the number of split ways as the current split way using a PDCCH.

[00154] Optionally, in the previous mode, the relay indication information can be carried in the second scheduling information. In other words, the second scheduling information includes the relay indication information.

[00155] Optionally, when the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, a first field in the downlink control information format that is used by the split indication and a second field in the downlink control information format that is used by the retransmission indication information include at least one of the same fields. Generally, the downlink control information formats (DCI) used for initial transmission scheduling and retransmission are the same, for example, DCI in a format 1. The format here is one of a plurality of DCI formats of a PDCCH, and transmission modes of scheduled data channels using different DCI formats may be different.For example, different DCI formats are typically used to scale a single-antenna data channel and a multi-antenna data channel, but a specifically used DCI format is not limited in the present invention. The first scaling information used to scale the first TB includes the... Petition 870260023484, dated 03 / 13 / 2026, p. 55 / 183 46 / 73 first field, and the first field indicates a splitting method. In this case, the first scheduling information may not include the retransmission indication information. The second scheduling information used to schedule the retransmitted code block includes the second field, and the second field is used as retransmission indication information. In this case, the second scheduling information may not indicate the splitting method. Therefore, preferably, the first and second fields can use the same field in DCI format, for example, a 2-bit field. Certainly, the first and second fields can be in an including-each-other relationship, that is, the first and second fields include the same field. For example, the first field includes two bits, and the second field includes three bits. In this case, the second field includes the first field. Alternatively, the first and second fields can partially overlap.For example, the first field and the second field each include three bits, and two bits in the first field overlap with two bits in the second field, and the first field and the second field each include a different bit.

[00156] For first-field and second-field indication methods, in one embodiment, when the radio access network device sends the transport block to the terminal device in the initial HARQ transmission, a specific first field (e.g., two specific indication bits) in the first scheduling information (e.g., control signaling in the DCI 1 format) carried on a control channel used to schedule the initially transmitted transport block is used as a transport block splitting indication. When the radio access network device sends the retransmitted code block to the terminal device, the second field (e.g., the two indication bits) Petition 870260023484, dated 03 / 13 / 2026, page 56 / 183 47 / 73 previous specific) in the second scheduling information (e.g., control signaling in the DCI 1 downlink control format or control signaling in another format, e.g., a DCI 1A format) carried on a control channel used to schedule the retransmitted code block is used as retransmission indication information. For example, during initial transmission, the two indication bits in the first field are used to indicate a division method from four division methods (e.g., including a time division method based on a first granularity, a time division method based on a second granularity, a frequency division method based on a third granularity, and a frequency division method based on a fourth granularity).During the retransmission of the retransmitted code block, based on the splitting method selected above, the 2-bit field in the first field during the initial transmission can be reused as the two indicator bits in the second field, to further indicate which code block is the current retransmitted code block in this splitting method.

[00157] In another embodiment, when the radio access network device sends the transport block to the terminal device in the initial HARQ transmission, a certain first field (e.g., two specific indication bits) in the first scheduling information (e.g., control signaling in a link-down control format, DCI 1 format) carried on a control channel used to schedule the initially transmitted transport block is used as a division indication of the transport block. When the radio access network device sends the retransmitted code block to the terminal device, the second field (e.g., the two preceding indication bits in the first field) in the second information Petition 870260023484, dated 03 / 13 / 2026, page 57 / 183 48 / 73 Scheduling (e.g., control signaling in the DCI 1 downlink control format or control signaling in another format, e.g., DCI 1A format) carried on a control channel used to schedule the retransmitted code block, and several additional bits (e.g., a specific extra indication bit) are used as the retransmission indication information. To be specific, the second 3-bit field of the retransmission indication information includes the two bits in the first field. Compared to a case where the first and second fields are the same, an advantage is the following: A granularity of indication of the retransmitted code block can be refined, or several cases of indication of the retransmitted code block are added.

[00158] Preferably, the second field may include all or some of the states represented by an MCS field. For a drawing of some retransmission indication information, an MCS field in the second scheduling information may be reused. Table 1 shows a splitting rule for an actual MCS field. It can be learned that the actual MCS field includes five bits and represents 32 states. The state indices 0 to 28, respectively, represent 29 MCS levels and are used for payload index lookup. Three states represented by MCS indices 29 to 31 are mainly used to change a modulation order during retransmission scheduling. Additionally, for initial transmission scheduling, MCS indices 0 to 28 and a time-frequency resource allocation field in the control information are used together to determine a payload size of a transport block or code block.For retransmission scheduling, because the payload of a code block needs to be consistent with that during the corresponding initial transmission, and a time-frequency resource occupied by the current HARQ retransmission is indicated using a dedicated field. Petition 870260023484, dated 03 / 13 / 2026, page 58 / 183 49 / 73 in the control information, for retransmission scheduling, at least MCS indices 0 to 28 are redundant, and MCS indices 29 to 31 are used only to change a modulation order during retransmission. However, there is no great need to change a modulation order during retransmission, and therefore MCS indices 29 to 31 can be considered redundant. Table 1 MCS division rule MCS Index Modulation Order Payload Index 0 2 0 1 2 1 2 2 2 3 2 3 4 2 4 5 2 5 6 2 6 7 2 7 8 2 8 9 2 9 10 4 9 11 4 10 12 4 11 13 4 12 14 4 13 15 4 14 16 4 15 17 6 ​​15 18 6 16 19 6 17 20 6 18 21 6 19 22 6 20 Petition 870260023484, dated 03 / 13 / 2026, page 59 / 183 50 / 73 MCS Index Modulation Order Payload Index 23 6 21 24 6 22 25 6 23 26 6 24 27 6 25 28 6 26 29 2 Reserved 30 4 31 6

[00159] Optionally, the retransmission indication information is also used to indicate whether the HARQ combination can be executed on all or some of the code blocks in the retransmitted code block. For example, the second field or an extra field is used to indicate whether the HARQ combination should be executed so that a HARQ buffer pollution problem can be avoided in a scenario where the eMBB is punctured for URLLC or interfered with by URLLC.

[00160] Optionally, retransmission indication information is also used to indicate the mode in which some code blocks are retransmitted or the mode in which all code blocks are retransmitted. In this solution, dynamic switching can be performed between retransmission of an entire transport block and retransmission of some code blocks in the transport block, and retransmission of the entire transport block can be indicated when a large number of code blocks are received incorrectly.

[00161] Optionally, the first return information also includes return information that corresponds to the first transport block and is used to indicate a reception status; and / or the second return information also includes return information that corresponds to the first transport block and is Petition 870260023484, dated 03 / 13 / 2026, p. 60 / 183 51 / 73 is used to indicate a receipt status.

[00162] In the conventional LTE system, before a plurality of CBs in a TB is encoded separately, a CRC needs to be added. Specifically, first, the TB CRC bits (usually 24 bits of TB CRC) need to be added to an original information bit of the TB, then the TB is segmented into the plurality of CBs, and then a CB CRC (usually 24 bits of CB CRC need to be added to each CB) needs to be added to each CB. The two levels of CRC addition processing aim to avoid the following cases: Decoding all CBs passes the CB CRC check, but the decoding of some CBs is actually incorrect, i.e., a false alarm occurs in the decoding of some CBs, and the probability of a false alarm increases as the number of CBs split from the TB increases. Therefore, in addition to CB CRC, all TB CRC is used as an extra layer of protection.Therefore, even if all CB CRC checks are successful, the final TB CRC check fails when a false alarm occurs in some CBs.

[00163] A similar concept also applies to a case where the return is performed for some CBs and some CBs are retransmitted. Specifically:

[00164] Optionally, the terminal device must also return, in the first return information, the return information corresponding to the first transport block; that is, the first return information also includes the return information corresponding to the first transport block and which is used to indicate the reception statuses. For the first return information, the return is performed based on a way of dividing an initially transmitted transport block into CBGs obtained by division. For example, suppose that TB includes four CBs, and the four CBs are divided into two CBGs, where a CB 1 and a CB 2 form a Petition 870260023484, dated 03 / 13 / 2026, p. 61 / 183 52 / 73 CBG 1, CB 3, and CB 4 form CBG 2. The terminal device separately performs decoding and a CB CRC check on each CB and then generates return information from CBG 1 for the decoding and CRC check states of CB 1 and CB 2. For example, if CB 1 and CB 2 pass the CB CRC check, an ACK is returned, or if CB 1 or CB 2 fails the CB CRC check, a NACK is returned. Similar processing is performed for CBG 2. To avoid the problem of a false alarm from a CB or CBG, the terminal device also checks the decoding status of the entire TB via a TB CRC, to generate an extra piece of return information corresponding to the entire CB CRC. For example, even if both CBG 1 and CBG 2 pass all CB CRC checks, when the TB CRC fails, the terminal device generates a NACK for the return information corresponding to the TB CRC, and sends the NACK to the radio access network device.In this case, since the radio access network device considers that the entire TB is not transmitted correctly, it does not matter whether an ACK or a NACK is returned in two return bits of CBG 1 and CBG 2. In this case, the radio access network device and the terminal device cannot know which CB CRC has a false alarm or which CB CRCs have false alarms.

[00165] Specifically, the ideal return states of the previous case are as follows: return states corresponding to {CBG 1, CBG 2, TB} are respectively {ACK, ACK, ACK}, {ACK, NACK, NACK}, {NACK, ACK, NACK}, {NACK, NACK, NACK} and {ACK, ACK, NACK}. In the last state, the return information corresponding to each CB is an ACK, only TB corresponds to a NACK, and indicates that a CB CRC has a false alarm. In this case, generally, the radio access network device cannot assume that a given CB is received correctly. One way of assumption depends on an internal implementation algorithm of the radio access network device. Petition 870260023484, dated 03 / 13 / 2026, page 62 / 183 53 / 73 radio. This special state is used to notify the radio access network device that the CB CRC has a false alarm. For the other return states, the radio access network device can assume that a CBG corresponding to an ACK is correctly received.

[00166] Optionally, for the return information of the first transport block, the first return information may not include the return information corresponding to the first transport block, that is, the first return information does not include the return information that corresponds to the first transport block and that is used to indicate the reception status. In another embodiment, the UE may formulate a rule instead of returning an ACK / NACK based on TB. The rule may include: If the UE detects that the TB CRC fails, the UE returns a NACK for all CBGS regardless of receiving status from the plurality of CBGS obtained by splitting the TB. That is, for the previous example, the UE, respectively, returns one bit for each of CBG1 and CBG2, that is, it returns a total of two bits, and does not need to return return information corresponding to the TB CRC. If the TB CRC fails, the UE returns {NACK, NACK} regardless of the reception status of CBG 1 and CBG 2.Alternatively, if the terminal device determines that the reception statuses corresponding to all CBs included in all CBGs are correctly received, i.e., the decoding statuses of the CBs or CBGs pass verification, for example, they pass CB CRC or a CBG CRC or pass verification of a verification matrix (a specific way is not limited), but a decoding status of the entire TB fails verification, in this case, for example, it fails verification of TB CRC or verification of a TB verification matrix (a specific way is not limited), the terminal device sets the decoding statuses corresponding to all CBGS to NACK and reports the NACKs. For example, a TB is split. Petition 870260023484, dated 03 / 13 / 2026, p. 63 / 183 54 / 73 on two CBGs. If the terminal device determines, through a CB CRC or CBG CRC, that each CBG passes verification, that is, the terminal device can return two ACKs in this case, but if the TB CRC fails, the terminal device needs to report two NACKs, and does not need to report any other information to the TB. It can be learned that there must be a false alarm on at least one CBG in this case; that is, the CBG is not decoded correctly, but passes verification. But neither the terminal device nor the base station can determine which CB or CBG has a false alarm. Therefore, it makes sense for the terminal device to report a NACK for each CBG, that is, report a complete NACK. For the base station, the base station receives all reported NACKs, and does not need to distinguish between the following two statuses: In a first status, all CBGs pass verification, but the TB fails verification, and in a second state, all CBGs fail decoding.In this case, for the base station, a preferable operation is to perform HARQ retransmission on all CBGs.

[00167] Optionally, the first return information includes CBG return information corresponding to each CBG return information and TB corresponding to the TB, and the sending of the return information can be implemented through channel selection. Specifically, if all CBGs are decoded correctly or are not decoded, or all CBGs pass the check but the TB CRC check fails, the terminal device sends the return information, for example, an ACK or a NACK, corresponding to the TB on a first return channel resource, but does not send return information corresponding to the CBG on a second return channel resource. If some CBGs are decoded correctly but the other CBG is not decoded, the terminal device sends return information corresponding to each CBG on a second return channel resource, but does not send return information corresponding to the TB. Petition 870260023484, dated 03 / 13 / 2026, p. 64 / 183 55 / 73 to the TB in a first return-channel resource or the second return-channel resource. Additionally, optionally, a rule for determining the first return-channel resource is different from a rule for determining the second return-channel resource. For example, the first return-channel resource is determined using an implicit rule, and the second return-channel resource is determined using an explicit rule. The implicit rule includes: implicitly indicating the corresponding first return-channel resource using a descending link control channel resource used to plan a TB or a CBG, and the explicit rule includes: explicitly indicating the second return-channel resource using upper-layer signaling and / or physical-layer signaling.Correspondingly, since the base station does not know the specific decoding states performed by the terminal device side on the TB and CBG, the base station side needs to perform blind detection on the first return channel resource and the second return channel resource. Similarly, the previous solution can be extended to a method for sending the second return information.

[00168] The second return information corresponds to a case where some CBs are retransmitted. Optionally, the terminal device still needs to return, in the second return information, the return information corresponding to the first transport block, that is, the second return information also includes the return information that corresponds to the first transport block and that is used to indicate the reception status. In addition, this mode can be combined with two modes regarding the first return information, that is, the first return information includes the return information of the first transport block or the first return information does not include the return information of the first transport block. Regardless of which mode is combined Petition 870260023484, dated 03 / 13 / 2026, page 65 / 183 56 / 73 With this mode, optionally, the size of a codebook for the second return information can be equal to or smaller than the size of a codebook for the first return information. The codebook size here is equivalent to the number of bits in an ACK / NACK in the return information for the first transport block, or the codebook block retransmitted in the first transport block before encoding.

[00169] For example, it is assumed that a TB includes six CBs, and the CBs are divided into three CBGs: {CB 1 and CB 2}, {CB 3 and CB 4}, and {CB 5 and CB 6}. It is assumed that no false alarms occur when the terminal device returns the first return information. For example, a state returned by the terminal device is {NACK, NACK, ACK, NACK} and the radio access network device assumes that a CBG 3 was received correctly and a CBG 1 and a CBG 2 were not received correctly. Next, the radio access network device retransmits CBs on CBG 1 and CBG 2 to the terminal device, and when encoding the retransmitted CBs, the radio access network device does not add a TB CRC for CB 1 to CB 4, and the terminal device separately returns return information for CBG 1, CBG 2, and TB.For example, in the previous example, after receiving the retransmitted CBG 1 and CBG 2, in addition to the return information for CBG 1 and CBG 2, the terminal device can perform a TB CRC check on CBG 1, CBG 2, and CBG 3, and return an ACK / NACK corresponding to the first entire TB.

[00170] It should be noted that the second return information must include the return information corresponding to the first TB, and a rule predetermined as the first return information cannot be used. Specifically, if the second return information does not include the return information corresponding to the first TB, but a solution of the rule predetermined as the first return information is used, Petition 870260023484, dated 03 / 13 / 2026, page 66 / 183 57 / 73 That is, after the retransmitted code block is decoded, if it is determined that the TB CRC fails, a NACK is returned for each retransmitted code block, but the return information corresponding to the first TB is not returned. The radio access network device cannot distinguish between whether the reception status of all retransmitted code blocks is NACKs (in this case, the radio access network device subsequently needs to transmit only the retransmitted code block) and whether the reception status of all retransmitted code blocks is ACKs, but the TB CRC fails. In the latter case, the radio access network device subsequently needs to retransmit all code blocks in the first TB due to a false alarm problem.

[00171] In another embodiment of the second return information, the size of a codebook of the second return information is equal to the size of a codebook of the first return information. A method in which a whole NACK is reported when all CBGs pass verification, but the TB fails verification, is also applicable to this embodiment. For example, a TB is split into two CBGs. The first return information for initial transmission includes an ACK corresponding to CBG 1 and a NACK corresponding to CBG 2. Then, the base station retransmits CBG 2. If the decoding performed by the terminal device on CBG 2 passes verification, but decoding of the TB including CBG 1 and CBG 2 fails verification, when the terminal device performs the HARQ return for CBG retransmission, the size of a codebook is still two bits. Specifically, as in the previous embodiment, two NACKs, i.e., a whole NACK, are returned.

[00172] In another embodiment concerning the size of a return information codebook, the size of an ACK / NACK codebook for the first return information is greater than or equal to the size of an ACK / NACK codebook for the Petition 870260023484, dated 03 / 13 / 2026, page 67 / 183 58 / 73 Second return information. Specifically, it is assumed that in a TB, a CB 1 and a CB 2 form a CBG 1, a CB 3 and a CB 4 form a CBG 2, a CB 5 and a CB 6 form a CBG 3, and a CB 7 and a CB 8 form a CBG 4 is used, and a TB-based ACK / NACK is not returned; and that a codebook size of ACK / NACK is 4, for example, {ACK, ACK, ACK, NACK}, respectively, corresponding to the four CBGs. Then, when the return is performed for retransmission of CBs in CBG 4, four bits are returned and, in this case, they can be {ACK, DTX, DTX, DTX} or {DTX, DTX, DTX, ACK}. DTX can be understood as an occupied bit that does not correspond to any CBG. Certainly, for the second return information, there may not be a need to reserve bit locations for all CBGS in an ACK / NACK codebook. In this case, the codebook size for the second return information may be smaller than the codebook size for the first return information.

[00173] Optionally, when the codebook size of the first return information is equal to the codebook size of the second return information, the second return information also includes return information corresponding to the second TB and / or return information corresponding to CBs in the second TB.

[00174] In another embodiment concerning a return information codebook size, if the same ACK / NACK codebook size is used, when some CBs are retransmitted, another TB can be transmitted. It is assumed that the other TB is a TB 2 or a second TB, and TB 2 includes two CBGS. When a return is made to CBG 4 in TB 1, two bits corresponding to two CBGS in TB 2 are returned together. That is, three bits that are returned are {ACK, DTX, ACK, NACK}, and return locations correspond, respectively, to CBG 4 in TB 1, an occupied bit, CBG 1 in TB 2, and CBG 2 in TB 2. It can be learned that the return bits corresponding to Petition 870260023484, dated 03 / 13 / 2026, page 68 / 183 59 / 73 Two CBGs on TB 2 are located in a part of the tail of the ACK / NACK codebook. Therefore, an ACK / NACK location of the CBG on TB1 may not be affected, and an inconsistency problem between the base station and the UE in understanding bits in the ACK / NACK codebook is avoided. Another method for placing ACK / NACKs corresponding to TB 2 is not excluded, provided that the return locations corresponding to the different TBs do not depend on each other. For example, {ACK, DTX, NACK, ACK} correspond respectively to CBG 4 on TB 1, an occupied bit, CBG 2 on TB 2, and CBG 1 on TB 2.

[00175] Optionally, when certain return information in the first return information is an ACK, the certain return information corresponds to a certain group of code blocks in at least two groups of code blocks, and a group of code blocks corresponding to the retransmitted code block does not include the certain group of code blocks, when the terminal device returns the second return information, the terminal device fills, with a NACK, a bit location corresponding to the certain group of code blocks in the codebook of the second return information.Specifically, for a CBG for which an ACK is returned when an AKC / NACK is returned for the initial transmission, considering that an incorrect return is performed for the second TB or CBs in the second TB because a joint return is performed for retransmission of some CBs and return information from the second TB, the NACK padding is performed, during the retransmission of the CBs, for the CBG corresponding to the previous ACK. For example, if the radio access network device schedules the second TB, but the terminal device loses control information used to schedule the second TB, if a specific code block group location is still padded with an ACK like the previously returned ACK, the radio access network device mistakes the ACK as an ACK corresponding to the second TB. Therefore... Petition 870260023484, dated 03 / 13 / 2026, page 69 / 183 In 60 / 73 mode, the radio access network device and the terminal device may be inconsistent with each other in understanding the return information, and a second TB physical layer packet loss event is caused.

[00176] Optionally, the return information corresponding to at least two groups of code blocks in the first return information is returned at different times, or the return information corresponding to the code blocks retransmitted in the second return information is returned at different times.

[00177] The description is provided using the first return information as an example, and similar processing is used in a solution for the second return information. Specifically, as shown in Figure 8, it is assumed that a time-divisioning method using three time-domain symbols as a granularity is used, and the first TB is divided into four CBGs through time division. As a feature mapping rule of the CBs is frequency-first time-second mapping, different elements can be decoded sequentially according to a buffering time sequence without waiting until all CBs are buffered for joint processing. Thus, for a CB corresponding to an element that is mapped and sent first, the terminal device can decode the CB first.For a CB corresponding to an element that is mapped and sent later, the terminal device can decode the CB later. Thus, for the CB that is decoded first, the terminal device can generate and send return information first. Similarly, for the CB that is decoded later, the terminal device can generate and send return information later. For example, the terminal device can send the return information at different times or at intervals. Petition 870260023484, dated 03 / 13 / 2026, pp. 70 / 183 61 / 73 different TTI transmissions. Correspondingly, the radio access network device can sequentially receive, at different times or in different TTIs, the return information sent by the terminal device, to accelerate a subsequent instruction segmentation processing procedure on the radio access network device side.

[00178] Corresponding to the previous method, the present invention provides embodiments of a terminal device and a radio access network device. The terminal device and the radio access network device can, respectively, perform the steps in the previous method embodiment.

[00179] With reference to Figure 9, the present invention provides an embodiment of a radio access network device, including: a processing unit 901, configured to split at least two code blocks included in a first transport block into at least two different code block groups based on a splitting method, where each code block group includes at least one of the at least two code blocks; a sending unit 902, configured to send the first transport block to a terminal device; and a receiving unit 903, configured to receive the first return information sent by the terminal device, where the first return information includes at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate the reception status of the at least two groups of code blocks.

[00180] Optionally, the transmission unit is further configured to send a retransmitted code block to the terminal device, where the retransmitted code block Petition 870260023484, dated 03 / 13 / 2026, pp. 71 / 183 62 / 73 includes some or all of the code blocks included in a code block corresponding to the negative acknowledgment information in the first return information; and the receiving unit is further configured to receive a second return information sent by the terminal device, where the second return information includes return information that corresponds to the retransmitted code block and that is used to indicate a reception status.

[00181] Optionally, the sending unit is further configured to send retransmission indication information to the terminal device, where the retransmission indication information is used to determine the retransmitted code block.

[00182] For detailed descriptions of the first transport block, the code block group, the splitting method, and the retransmitted code block in this mode, see the previous method mode.

[00183] Optionally, when the radio access network device supports a plurality of splitting methods, the transmitting unit is further configured to send to the terminal device the first scheduling information used to schedule the first transport block, where the first scheduling information includes a split indication, and the split indication is used to indicate one of the plurality of splitting methods; or the transmitting unit is further configured to send upper-layer signaling to the terminal device, where the upper-layer signaling includes a split indication, and the split indication is used to indicate one of the plurality of splitting methods.

[00184] Optionally, the sending unit is also configured to send, to the terminal device, the second scheduling information used to schedule the Petition 870260023484, dated 03 / 13 / 2026, page 72 / 183 63 / 73 retransmitted code block, where the second scheduling information includes the retransmission indication information.

[00185] Optionally, the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in the downlink control information format and that is used by the split indication and a second field that is in the downlink control information format and that is used by the retransmission indication information include the same field.

[00186] Optionally, the retransmission indication information is also used to indicate whether the HARQ combination can be executed on all or some code blocks in the retransmitted code block.

[00187] Optionally, the first return information also includes return information used to indicate a reception status of the first transport block; and / or the second return information also includes return information used to indicate a reception status of the first transport block.

[00188] For specific definitions and implementations of the first return information, the retransmission indication information, the first scheduling information, and the second scheduling information in this mode, see the related descriptions of the previous method mode.

[00189] With reference to Figure 10, the hardware elements of the radio access network device include: A processor 1001, configured to split at least two code blocks included in a first transport block into at least two different code block groups based on a splitting method, where each code block group includes at least one of the at least two Petition 870260023484, dated 03 / 13 / 2026, page 73 / 183 64 / 73 code blocks; a transmitter 1002, configured to send the first transport block to a terminal device; and a receiver 1003, configured to receive the first return information sent by the terminal device, where the first return information includes at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate reception status of the at least two groups of code blocks.

[00190] Optionally, the transmitter is further configured to send a retransmitted code block to the terminal device, where the retransmitted code block includes some or all of the code blocks included in a code block corresponding to the negative acknowledgment information in the first return information; and the receiver is further configured to receive second return information sent by the terminal device, where the second return information includes return information that corresponds to the retransmitted code block and that is used to indicate a reception status.

[00191] Optionally, the transmitter is further configured to send retransmission indication information to the terminal device, where the retransmission indication information is used to determine the retransmitted code block.

[00192] For detailed descriptions of the first transport block, the code block group, the splitting method, and the retransmitted code block in this mode, see the previous method mode.

[00193] Optionally, when the radio access network device supports multiple ways of splitting, the transmitter is configured to send the first scaling information used to the terminal device. Petition 870260023484, dated 03 / 13 / 2026, page 74 / 183 65 / 73 scale the first transport block, where the first scaling information includes a split indication, and the split indication is used to indicate one of the plurality of split ways; or the transmitter is further configured to send upper layer signaling to the terminal device, where the upper layer signaling includes a split indication, and the split indication is used to indicate one of the plurality of split ways.

[00194] Optionally, the transmitter is further configured to send to the terminal device the second scheduling information used to schedule the retransmitted code block, where the second scheduling information includes the retransmission indication information.

[00195] Optionally, the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in downlink control information format and that is used by the split indication and a second field that is in downlink control information format and that is used by the retransmission indication information include the same field.

[00196] Optionally, the retransmission indication information is also used to indicate whether the HARQ combination can be ported in all or some of the code blocks in the retransmitted code block.

[00197] Optionally, the first return information also includes return information used to indicate a receipt status for the first transport block; and / or the second return information also includes return information used to indicate a receipt status for the first transport block.

[00198] For specific definitions and implementations of Petition 870260023484, dated 03 / 13 / 2026, p. 75 / 183 66 / 73 first return information, retransmission indication information, first escalation information and second escalation information in this mode, see related descriptions of the previous method mode.

[00199] With reference to Figure 11, the present invention provides a terminal device, including: a receiving unit 1101, configured to receive a first transport block sent by a radio access network device, where the first transport block includes at least two code blocks, at least two code blocks are split into at least two different code block groups based on a splitting method, and each code block group includes at least one of the at least two code blocks; a processing unit 1102, configured to generate initial return information, wherein the initial return information includes at least two return information parts corresponding to the first transport block, and the at least two return information parts are used to indicate the reception statuses of at least two groups of code blocks; and a sending unit 1103, configured to send the initial return information to the radio access network device.

[00200] Optionally, the receiving unit is further configured to receive a retransmitted code block sent by the radio access network device, where the retransmitted code block includes some or all of the code blocks included in a group of code blocks corresponding to negative acknowledgment information in the first return information; and the sending unit is further configured to send second return information to the radio access network device. Petition 870260023484, dated 03 / 13 / 2026, p. 76 / 183 67 / 73 radio, where the second return information includes return information that corresponds to the retransmitted code block and is used to indicate a reception status.

[00201] Optionally, the receiving unit is further configured to receive retransmission indication information sent by the radio access network device, where the retransmission indication information is used to determine the retransmitted code block; and the receiving unit receives the retransmitted code block based on the splitting method and the retransmission indication information.

[00202] For detailed descriptions of the first transport block, the code block group, the splitting method, and the retransmitted code block in this mode, see the previous method mode.

[00203] Optionally, when the radio access network device supports a plurality of splitting ways, the receiving unit is further configured to receive the first scheduling information that is sent by the radio access network device and that is used to schedule the first transport block, where the first scheduling information includes a split indication, and the split indication is used to indicate one of the plurality of splitting ways; or the receiving unit is further configured to receive upper layer signaling sent by the radio access network device, where the upper layer signaling includes a split indication, and the split indication is used to indicate one of the plurality of splitting ways.

[00204] Optionally, the receiving unit is further configured to receive second scaling information that is sent by the radio access network device and which is used to scale the retransmitted code block, where the second scaling information includes the information of Petition 870260023484, dated 03 / 13 / 2026, page 77 / 183 68 / 73 indication of retransmission.

[00205] Optionally, the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in the downlink control information format and that is used by the split indication and a second field that is in the downlink control information format and that is used by the retransmission indication information include the same field.

[00206] Optionally, retransmission indication information is still used to indicate whether the HARQ combination can be executed on all or some code blocks in the retransmitted code block.

[00207] Optionally, the first return information also includes return information used to indicate a receipt status for the first transport block; and / or the second return information also includes return information used to indicate a receipt status for the first transport block.

[00208] For specific definitions and implementations of the first return information, the retransmission indication information, the first escalation information, and the second escalation information in this mode, see the related descriptions of the previous method mode.

[00209] With reference to Figure 12, hardware elements of the terminal device include: A 1201 receiver, configured to receive a first transport block sent by a radio access network device, where the first transport block includes at least two code blocks, the at least two code blocks are divided into at least two different code block groups based on a splitting method, and each group of Petition 870260023484, dated 03 / 13 / 2026, pp. 78 / 183 69 / 73 code blocks include at least one of the two code blocks; a 1202 processor, configured to generate initial return information, wherein the initial return information includes at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate reception status of at least two groups of code blocks; and a 1203 transmitter, configured to send the initial return information to the radio access network device.

[00210] Optionally, the receiver is further configured to receive a retransmitted code block sent by the radio access network device, wherein the retransmitted code block includes some or all of the code blocks included in a group of code blocks corresponding to the negative acknowledgment information in the first return information; and the transmitter is further configured to send a second return information to the radio access network device, wherein the second return information includes return information that corresponds to the retransmitted code block and that is used to indicate a reception status.

[00211] Optionally, the receiver is further configured to receive retransmission indication information sent by the radio access network device, where the retransmission indication information is used to determine the retransmitted code block; and the receiver receives the retransmitted code block based on the splitting method and the retransmission indication information.

[00212] For detailed descriptions of the first transport block, the group of code blocks, the division method and Petition 870260023484, dated 03 / 13 / 2026, p. 79 / 183 70 / 73 the code block retransmitted in this mode, see the previous method mode.

[00213] Optionally, when the radio access network device supports a plurality of splitting methods, the receiver is further configured to receive the first scheduling information that is sent by the radio access network device and that is used to schedule the first transport block, where the first scheduling information includes a split indication, and the split indication is used to indicate one of the plurality of splitting methods; or the receiver is further configured to receive upper layer signaling sent by the radio access network device, where the upper layer signaling includes a split indication, and the split indication is used to indicate one of the plurality of splitting methods.

[00214] Optionally, the receiver is further configured to receive second scaling information that is sent by the radio access network device and which is used to scale the retransmitted code block, where the second scaling information includes the retransmission indication information.

[00215] Optionally, the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in the downlink control information format and that is used by the split indication and a second field that is in the downlink control information format and that is used by the retransmission indication information include the same field.

[00216] Optionally, retransmission indication information is still used to indicate whether the HARQ combination can be executed in all or some code blocks in Petition 870260023484, dated 03 / 13 / 2026, pp. 80 / 183 71 / 73 retransmitted code block.

[00217] Optionally, the first return information also includes return information used to indicate a receipt status of the first transport block; and / or the second return information also includes return information used to indicate a receipt status of the first transport block.

[00218] For specific definitions and implementations of the first return information, the retransmission indication information, the first escalation information, and the second escalation information in this mode, see the related descriptions of the previous method mode.

[00219] In the various embodiments provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the described apparatus embodiment is merely an example. For example, unit division is merely logical function division and may be another division in the actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not implemented. Furthermore, the mutual couplings or direct couplings or communication connections shown or discussed may be implemented using some interfaces. Indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms.

[00220] The units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one position, or may be distributed across a plurality of network units. Some or all of the units may be selected based on the actual requirements to achieve the objectives of the modal solutions. Petition 870260023484, dated 03 / 13 / 2026, pp. 81 / 183 72 / 73

[00221] Furthermore, functional units in the embodiments of the present invention may be integrated into a processing unit, or each of the units may exist physically on its own, or two or more units may be integrated into one unit. For example, the receiver and transmitter in the preceding specification may be physically integrated into a module, for example, a transceiver or an antenna.

[00222] All or some of the foregoing embodiments may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, the embodiments may be implemented wholly or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instruction is loaded and executed on the computer, the procedure or functions according to the embodiments of the present invention are wholly or partially generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions may be stored on a computer-readable storage medium or may be transmitted from one computer-readable storage medium to another computer-readable storage medium.For example, computer instructions can be transmitted from one site, computer, server, or data center to another site, computer, server, or data center via cable (e.g., coaxial cable, fiber optic cable, or digital subscriber line (DSL)) or wirelessly (e.g., infrared, radio, or microwave). The computer-readable storage medium can be any available medium accessible by a computer, or a data storage device, such as a server or data center, integrating one or more available media. The available medium can be a magnetic medium (e.g., a... Petition 870260023484, dated 03 / 13 / 2026, pp. 82 / 183 73 / 73 floppy disk, a hard disk or a magnetic tape), an optical medium (e.g., DVD), a semiconductor medium (e.g., a solid-state disk, Solid State Disk (SSD)), or similar. Petition 870260023484, dated 03 / 13 / 2026, page 83 / 183

Claims

1 / 12 CLAIMS 1. A method of data transmission, characterized in that it comprises: sending (301), by a radio access network device, a first transport block to a terminal device, wherein the first transport block comprises at least two code blocks, the at least two code blocks are divided into at least two different code block groups, and each code block group comprises at least one of the at least two code blocks; and receiving (304), by the radio access network device, first return information from the terminal device, wherein the first return information comprises at least two return information parts corresponding to the first transport block, and the at least two return information parts are used, respectively, to indicate reception status of the at least two code block groups;where each of at least two return information pieces in the first return information indicates a negative acknowledgment information reception status, in the case where the terminal device determines that each of at least two groups of code blocks passes decoded verification, but the first transport block fails decoded verification.

2. Method according to claim 1, characterized in that it further comprises: sending (305), by the radio access network device, at least one first group of code blocks to the terminal device, wherein the at least one first group of code blocks corresponds to the negative acknowledgment information in the first return information; and receiving, by the radio access network device, second return information from the terminal device, wherein the second return information comprises return information indicating a reception status of at least one first group of code blocks.

3. A method according to claim 2, characterized in that the second return information is negative acknowledgment information, in the case where the terminal device determines that each of at least one first group of code blocks passes decoded verification, but a transport block including at least one first group of code blocks fails decoded verification.

4. A method according to claim 3, characterized in that the size of a codebook for the second return information is equal to the size of a codebook for the first return information, and the size of the codebook is equal to the number of groups of code blocks in the first transport block.

5. Method, according to any one of claims 2 to 4, characterized in that it further comprises: sending (307), by the radio access network device, retransmission indication information to the terminal device, wherein the retransmission indication information indicates at least one first group of code blocks.

6. A method, according to any one of claims 1 to 5, characterized in that the at least two code blocks in the first transport block are divided into at least two different groups of code blocks based on the logical sequence number of the code blocks or based on the time-frequency resources occupied by the code blocks.

7. A method according to any one of claims 1 to 6, characterized in that the at least two code blocks occupy a first time-frequency resource, the first time-frequency resource comprises at least two resource regions, the at least two resource regions correspond to at least two groups of code blocks, the code block comprised in each group of code blocks occupies a resource region corresponding to the code block groups, and the division manner comprises one of the following plurality of division manners: the at least two resource regions are located in different time domains; the at least two resource regions are located in different frequency domains; time domain and / or frequency domain resources occupied by the at least two resource regions are not completely the same;and at least two resource regions comprise at least one first-type region and at least one second-type region, the first-type region corresponds to a specific code block group, the second-type region does not correspond to the specific code block group, and the specific code block group belongs to at least two code block groups; or at least two resource regions comprise at least one first-type region and at least one second-type region, the first-type region supports transmission of a first-type service, and the second-type region does not support transmission of the first-type service.

8. A method according to any one of claims 1 to 7, characterized in that the at least two groups of code blocks comprise a group of code blocks of the first type and a group of code blocks of the second type, and the group of code blocks of the first type and the group of code blocks of the second type comprise at least one of the same code blocks.

9. Method, according to any of the claims 1 Petition 870260023484, dated 03 / 13 / 2026, p. 86 / 183 4 / 12 to 8, characterized in that the method further comprises: sending, by the radio access network device to the terminal device, first scheduling information used to schedule the first transport block, wherein the first scheduling information comprises a split indication, and the split indication is used to indicate a splitting manner of the first transport block; or sending, by the radio access network device, upper layer signaling to the terminal device, wherein the upper layer signaling comprises a split indication, and the split indication is used to indicate a splitting manner of the first transport block.

10. A method according to claim 5, characterized in that the retransmission indication information is carried in second scheduling information from the radio access network device and is used to schedule at least one first group of code blocks.

11. A method according to claim 10, characterized in that the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in the downlink control information format and that is used by the split indication and a second field that is in the downlink control information format and that is used by the retransmission indication information comprise the same field.

12. A method, according to any one of claims 5 to 11, characterized in that the retransmission indication information is further used to indicate whether the HARQ combination can be executed on all or some of the code blocks in at least one first group of code blocks.

13. Data transmission method, characterized by the fact Petition 870260023484, of 03 / 13 / 2026, page 87 / 183 5 / 12 that it comprises: receiving (302), by a terminal device, a first transport block from a radio access network device, wherein the first transport block comprises at least two code blocks, the at least two code blocks are divided into at least two different code block groups, and each code block group comprises at least one of the at least two code blocks; and sending, by the terminal device, first return information to the radio access network device, wherein the first return information comprises at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate reception status of the at least two code block groups;where each of at least two return information pieces in the first return information indicates a negative acknowledgment information reception status, in the case where the terminal device determines that each of at least two groups of code blocks passes decoded verification, but the first transport block fails decoded verification.

14. Method according to claim 13, characterized in that it further comprises: receiving (306), by the terminal device, at least one first group of code blocks from the radio access network device, wherein the at least one first group of code blocks corresponds to the negative acknowledgment information in the first return information; and sending (309), by the terminal device, second return information to the radio access network device, wherein the second return information comprises return information indicating a reception status of at least one first group of code blocks.

15. A method according to claim 14, characterized in that the second return information is negative acknowledgment information, in the case where the terminal device determines that each of at least one first group of code blocks passes decoded verification, but a transport block including at least one first group of code blocks fails decoded verification.

16. Method, according to claim 15, characterized in that the size of a codebook of the second return information is equal to the size of a codebook of the first return information, and the size of the codebook is equal to the number of groups of code blocks in the first transport block.

17. A method according to any one of claims 14 to 16, characterized in that it further comprises: receiving, by the terminal device, retransmission indication information from the radio access network device, wherein the retransmission indication information indicates at least one first group of code blocks.

18. A method, according to any one of claims 13 to 17, characterized in that the at least two code blocks in the first transport block are divided into at least two different groups of code blocks based on the logical sequence number of the code blocks or based on the time-frequency resources occupied by the code blocks.

19. A method according to any one of claims 13 to 18, characterized in that the at least two code blocks occupy a first time-frequency resource, the first time-frequency resource comprises at least two resource regions, the at least two resource regions correspond to the at least two groups of code blocks, the code block comprised in each group of code blocks occupies a resource region corresponding to the code block groups of the code block, and the division manner comprises one of the following plurality of division manners: the at least two resource regions are located in different time domains; the at least two resource regions are located in different frequency domains; time domain and / or frequency domain resources occupied by the at least two resource regions are not completely the same;and at least two resource regions comprise at least one first-type region and at least one second-type region, the first-type region corresponds to a specific code block group, the second-type region does not correspond to the specific code block group, and the specific code block group belongs to at least two code block groups; or at least two resource regions comprise at least one first-type region and at least one second-type region, the first-type region supports transmission of a first-type service, and the second-type region does not support transmission of the first-type service.

20. A method according to any one of claims 13 to 19, characterized in that the at least two groups of code blocks comprise a group of code blocks of the first type and a group of code blocks of the second type, and the group of code blocks of the first type and the group of code blocks of the second type comprise at least one of the same code blocks.

21. A method, according to any one of claims 13 to 20, characterized in that the method further comprises: receiving, by the terminal device, first scheduling information from the radio access network device, which is used to schedule the first transport block, wherein the first scheduling information comprises a split indication, and the split indication is used to indicate a way of splitting the first transport block; or receiving, by the terminal device, upper-layer signaling from the radio access network device, wherein the upper-layer signaling comprises a split indication, and the split indication is used to indicate a way of splitting the first transport block.

22. A method according to claim 21, characterized in that the retransmission indication information is carried in second scheduling information from the radio access network device and is used to schedule at least one first group of code blocks.

23. A method according to claim 22, characterized in that the first scheduling information and the second scheduling information are carried on control channels in the same downlink control information format, and a first field that is in the downlink control information format and that is used by the split indication and a second field that is in the downlink control information format and that is used by the retransmission indication information comprise the same field.

24. A method according to any one of claims 15 to 23, characterized in that the retransmission indication information is further used to indicate whether the HARQ combination can be executed on all or some of the code blocks in at least one first group of code blocks.

25. Radio access network device, characterized in that it comprises: Petition 870260023484, dated 03 / 13 / 2026, page 91 / 183 9 / 12 a processing unit (901), configured to divide at least two code blocks comprised in a first transport block into at least two different code block groups, wherein each code block group comprises at least one of the at least two code blocks; a sending unit (902), configured to send the first transport block to a terminal device; and a receiving unit (903), configured to receive first return information from the terminal device, wherein the first return information comprises at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate the reception status of the at least two code block groups;where each of at least two return information pieces in the first return information indicates a negative acknowledgment information reception status, in the case where the terminal device determines that each of at least two groups of code blocks passes decoded verification, but the first transport block fails decoded verification.

26. Radio access network device, characterized in that it comprises: a processor (1001), configured to split at least two code blocks comprised in a first transport block into at least two different code block groups, wherein each code block group comprises at least one of the at least two code blocks; a transmitter (1002), configured to send the first transport block to a terminal device; and a receiver (1003), configured to receive first return information from the terminal device, in Petition 870260023484, dated 03 / 13 / 2026, p.92 / 183 10 / 12 that the first return information comprises at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate reception status of the at least two groups of code blocks; wherein each of the at least two return information parts in the first return information indicates a negative acknowledgment information reception status, in the case that the terminal device determines that each of the at least two groups of code blocks passes decoded verification, but the first transport block fails decoded verification.

27. Terminal device, characterized in that it comprises: a receiving unit (1101), configured to receive a first transport block from a radio access network device, wherein the first transport block comprises at least two code blocks, the at least two code blocks are divided into at least two different code block groups, and each code block group comprises at least one of the at least two code blocks; a processing unit (1102), configured to generate first return information, wherein the first return information comprises at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate reception status of the at least two code block groups;and a sending unit (1103), configured to send the first return information to the radio access network device; wherein each of at least two return information parts in the first return information indicates a status of Petition 870260023484, dated 03 / 13 / 2026, page 93 / 183 11 / 12 receipt of negative acknowledgment information, in the case that the terminal device determines that each of at least two groups of code blocks passes decoded verification, but the first transport block fails decoded verification.; 28. Terminal device, characterized in that it comprises: a receiver (1201), configured to receive a first transport block from a radio access network device, wherein the first transport block comprises at least two code blocks, the at least two code blocks are divided into at least two different code block groups, and each code block group comprises at least one of the at least two code blocks; a processor (1202), configured to generate first return information, wherein the first return information comprises at least two return information parts corresponding to the first transport block, and the at least two return information parts are respectively used to indicate reception status of the at least two code block groups; and a transmitter (1203), configured to send the first return information to the radio access network device;where each of at least two return information pieces in the first return information indicates a negative acknowledgment information reception status, in the case where the terminal device determines that each of at least two groups of code blocks passes decoded verification, but the first transport block fails decoded verification.

29. Data transmission device, characterized in that it comprises: Petition 870260023484, dated 03 / 13 / 2026, p. 94 / 183 12 / 12 a processor and a memory unit that stores instructions; wherein, when executed by the processor, the instructions enable the data transmission device to execute the method of any of claims 1 to 24. Petition 870260023484, dated 03 / 13 / 2026, p. 95 / 183

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