CN114070479A

CN114070479A - Method and device for retransmitting data

Info

Publication number: CN114070479A
Application number: CN202010791666.9A
Authority: CN
Inventors: 焦淑蓉; 李军; 花梦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2022-02-18
Also published as: WO2022028158A1

Abstract

A method and device for retransmitting data, the method comprises: when the network device schedules retransmission of a part of bit sequences in a TB, the terminal device may retransmit a second bit sequence corresponding to the part and a first CRC bit sequence or a second CRC bit sequence as needed, generate second uplink data, and send the second uplink data to the network device, where the first CRC bit sequence is generated according to the second bit sequence, and the second CRC bit sequence is generated according to the first bit sequence corresponding to the TB. Therefore, the gain of the CRC can be obtained as much as possible, the performance loss caused by the false alarm of the CRC is effectively reduced, and the complexity of the realization of the terminal equipment can be reduced.

Description

Method and device for retransmitting data

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for retransmitting data.

Background

The fifth generation (5G) mobile communication system may simultaneously support services of multiple service types, such as enhanced mobile broadband (eMBB) service, high-reliability and low-latency communications (URLLC) service, and massive machine type communication (mtc) service.

Due to the burstiness of the data of the URLLC service, in order to improve the resource utilization rate of the system, the network device usually does not reserve resources for the data transmission of the URLLC service. When the network device or the terminal device has the URLLC service data to send, if there is no idle time-frequency resource at this time, the network device may allocate the resource for the URLLC service in a preemption manner in order to meet the ultra-short delay requirement of the URLLC service. Preemption may occur between different service transmissions of the same terminal device or between different terminal devices that perform different service transmissions.

As shown in fig. 1, since the scheduling time unit of the eMBB service is longer and the scheduling time unit of the URLLC service is shorter, the network device may select some or all of the time-frequency resources for transmitting the URLLC service data on the allocated time-frequency resources for transmitting the eMBB service data. For data transmission of the eMB service, once the resources of the eMB service are preempted, the data transmission of the eMB service on the preempted symbol and the symbol after the preempted symbol is cancelled. In this scenario, how to retransmit the cancelled data of the eMBB service is a problem to be solved.

Disclosure of Invention

The method and the device for retransmitting data in the embodiment of the application are used for realizing the retransmission of partial CBG in the transmission based on the CBG.

In a first aspect, embodiments of the present application provide a method for retransmitting data, where the method may be performed by a terminal device, or may be performed by a component (e.g., a chip or a circuit) configured in the terminal device, and in the following description of the present application, the method performed by the terminal device will be described as an example.

The method can comprise the following steps: the terminal equipment receives first downlink control information from the network equipment, the first downlink control information is used for scheduling initial transmission of first uplink data, the first uplink data comprises a TB, and the TB is composed of a first bit sequence (b)₀,b₁,……b_L-1) Composition is carried out; the terminal equipment receives second downlink control information from the network equipment, and the second downlink control information is used for scheduling retransmission of the first bit sequenceSecond bit sequence (b) in the column_r,b_r+1,……b_L-1) R is a positive integer; the terminal equipment generates second uplink data according to a second bit sequence and a first CRC bit sequence, or generates second uplink data according to the second bit sequence and the second CRC bit sequence, wherein the first CRC bit sequence is generated according to the second bit sequence, and the second CRC bit sequence is generated according to the first bit sequence; and the terminal equipment sends the second uplink data to the network equipment.

By adopting the technical scheme, when the terminal equipment is scheduled to retransmit a part of bit sequences in one TB, the terminal equipment can generate second uplink data to be sent according to the part of bit sequences to be transmitted and the first CRC bit sequence or the second CRC bit sequence, and send the second uplink data to be sent to the network equipment. Therefore, the gain of the TB CRC can be obtained as much as possible, the performance loss caused by CB CRC false alarm is effectively reduced, and the complexity of realizing the terminal equipment can be reduced.

In one possible design of the first aspect, if the terminal device further receives third downlink control information from the network device before receiving the second downlink control information, the third downlink control information indicating that partial transmission of the first bit sequence is cancelled, the terminal device generates second uplink data according to the second bit sequence and the first CRC bit sequence.

In a possible design of the first aspect, if the terminal device has not generated the second CRC bit sequence from the first bit sequence before receiving the second downlink control information, the terminal device generates the second uplink data from the second bit sequence and the first CRC bit sequence.

In one possible design of the first aspect, if the terminal device does not receive third downlink control information from the network device indicating that partial transmission of the first bit sequence is cancelled before receiving the second downlink control information, the terminal device generates second uplink data according to the second bit sequence and the second CRC bit sequence.

In one possible design of the first aspect, if the terminal device has generated the second CRC bit sequence from the first bit sequence before receiving the second downlink control information, the terminal device generates the second uplink data from the second bit sequence and the second CRC bit sequence.

In a possible design of the first aspect, the terminal device receives configuration information from the network device, where the configuration information indicates CBG-based transmission, and the configuration information includes first information indicating a maximum number of CBGs included in the TB.

In a second aspect, embodiments of the present application provide a method for retransmitting data, where the method may be performed by a network device, or may be performed by a component (e.g., a chip or a circuit) configured in the network device, and in the following description of the present application, the method performed by the network device is taken as an example.

The method can comprise the following steps: the network equipment sends first downlink control information to the terminal equipment, the first downlink control information is used for scheduling initial transmission of first uplink data, the first uplink data comprises a TB, and the TB is composed of a first bit sequence (b)₀,b₁,……b_L-1) Composition is carried out; the network equipment sends second downlink control information to the terminal equipment, wherein the second downlink control information is used for scheduling and retransmitting a second bit sequence in the first bit sequence, (b)_r,b_r+1,……b_L-1) R is a positive integer; the network device receives second uplink data from the terminal device, the second uplink data being generated according to a second bit sequence and a first CRC bit sequence, or the second uplink data being generated according to a second bit sequence and a second CRC bit sequence, wherein the first CRC bit sequence is generated according to the second bit sequence and the second CRC bit sequence is generated according to the first bit sequence.

In one possible design of the second aspect, the second uplink data is generated based on the second bit sequence and the first CRC bit sequence if the network device sends third downlink control information to the terminal device before sending the second downlink control information, the third downlink control information indicating that partial transmission of the first bit sequence is cancelled.

In one possible design of the second aspect, the second uplink data is generated according to the second bit sequence and the first CRC bit sequence if the second CRC bit sequence generated according to the first bit sequence has not been received by the network device before the second downlink control information is transmitted.

In one possible design of the second aspect, the second uplink data is generated based on the second bit sequence and the second CRC bit sequence if the network device does not send third downlink control information to the terminal device before sending the second downlink control information, the third downlink control information indicating that partial transmission of the first bit sequence is cancelled.

In one possible design of the second aspect, the second uplink data is generated according to the first bit sequence and the second CRC bit sequence if the network device has received the second CRC bit sequence generated according to the first bit sequence before transmitting the second downlink control information.

In one possible design of the second aspect, the method further includes: and the network equipment sends configuration information to the terminal equipment, wherein the configuration information indicates the transmission based on the CBG, the configuration information comprises first information, and the first information indicates the maximum number of the CBGs in the TB.

In a third aspect, embodiments of the present application provide a method for retransmitting data, where the method may be performed by a network device, or may be performed by a component (e.g., a chip or a circuit) configured in the network device, and in the following description of the present application, the method performed by the network device is taken as an example.

The method can comprise the following steps: the network equipment generates downlink control information, the downlink control information is used for scheduling first uplink data, the first uplink data comprises a TB, the TB comprises N CBGs, the downlink control information comprises second information and third information, the second information is used for indicating M CBGs in the N CBGs, the M CBGs comprise a last CBG in the N CBGs, the third information is used for indicating retransmission, and both N and M are positive integers; wherein, if the network device does not receive at least one CBG of the N CBGs before transmitting the downlink control information, the M is equal to N; and the network equipment sends the downlink control information to the terminal equipment.

By adopting the technical scheme, the operation of scheduling retransmission of the network equipment is limited, and the network equipment is required to transmit the complete TB for at least once before the transmission of the scheduling part of the CBG, so that the terminal equipment can realize the retransmission of the part of the CBG based on the second CRC bit sequence generated in the process of transmitting the complete TB.

In a possible design of the third aspect, if the network device receives the N CBGs before sending the downlink control information, but at least one CBG of the N CBGs is not decoded successfully, M is less than or equal to N.

In a possible design of the third aspect, the network device sends, to the terminal device, configuration information, where the configuration information is used to indicate CBG-based transmission, and the configuration information includes first information, and the first information is used to indicate a maximum number of CBGs included in the TB.

In a fourth aspect, the present application provides a method for retransmitting data, where the method may be performed by a terminal device, or may be performed by a component (e.g., a chip or a circuit) configured in the terminal device, and in the following description of the present application, the method performed by the terminal device is taken as an example.

The method can comprise the following steps: the terminal device receives downlink control information from the network device, the downlink control information is used for scheduling first uplink data, the first uplink data includes a TB, the TB includes N CBGs, the downlink control information includes second information and third information, the second information is used for indicating M CBGs of the N CBGs, the M CBGs include a last CBG of the N CBGs, the third information is used for indicating retransmission, the N and the M are positive integers, and M is smaller than N; and if the terminal equipment does not generate a second CRC bit sequence according to the information bit sequence corresponding to the TB before the downlink control information is received, the terminal equipment ignores the downlink control information.

In a possible design of the fourth aspect, if the terminal device has generated the second CRC bit sequence according to the information bit sequence corresponding to the TB before receiving the downlink control information, the terminal device generates the second uplink data according to the information bit sequences corresponding to the M CBGs and the second CRC bit sequence.

In a possible design of the fourth aspect, the terminal device receives configuration information from the network device, where the configuration information indicates CBG-based transmission, and the configuration information includes first information indicating a maximum number of CBGs included in the TB.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, where the apparatus has a function of implementing the terminal device in any one of the above-mentioned first aspect or any one of the above-mentioned possible designs of the first aspect, or has a function of implementing the terminal device in any one of the above-mentioned fourth aspect or any one of the above-mentioned possible designs of the fourth aspect, and the apparatus may be the terminal device, or may be a chip included in the terminal device.

The communication apparatus may also have a function of implementing the network device in any one of the possible designs of the second aspect or the second aspect, or a function of implementing the network device in any one of the possible designs of the third aspect or the third aspect, and the apparatus may be a network device, or may be a chip included in the network device.

The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software, which includes one or more modules or units or means (means) corresponding to the functions.

In one possible design, the apparatus structurally includes a processing module and a transceiver module, where the processing module is configured to support the apparatus to perform a function corresponding to the terminal device in any one of the above-mentioned designs of the first aspect or the first aspect, or to perform a function corresponding to the network device in any one of the above-mentioned designs of the second aspect or the second aspect, or to perform a function corresponding to the network device in any one of the above-mentioned designs of the third aspect or the third aspect, or to perform a function corresponding to the terminal device in any one of the above-mentioned designs of the fourth aspect or the fourth aspect. The transceiver module is used for supporting communication between the apparatus and other communication devices, for example, when the apparatus is a terminal device, the transceiver module may receive downlink control information from a network device. The communication device may also include a memory module, coupled to the processing module, that retains the necessary program instructions and data for the device. As an example, the processing module may be a processor, the communication module may be a transceiver, the storage module may be a memory, and the memory may be integrated with the processor or provided separately from the processor.

In another possible design, the apparatus may be configured to include a processor and may also include a memory. The processor is coupled to the memory and is operable to execute the computer program instructions stored in the memory to cause the apparatus to perform the method of the first aspect or any of the possible designs of the first aspect, or the second aspect, or any of the possible designs of the third aspect, or any of the possible designs of the fourth aspect. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface. When the apparatus is a network device or a terminal device, the communication interface may be a transceiver or an input/output interface; when the apparatus is a chip included in a network device or a chip included in a terminal device, the communication interface may be an input/output interface of the chip. Alternatively, the transceiver may be a transmit-receive circuit and the input/output interface may be an input/output circuit.

In a sixth aspect, an embodiment of the present application provides a chip system, including: a processor coupled to a memory for storing a program or instructions which, when executed by the processor, cause the system-on-chip to implement the method in the first aspect or any one of the possible designs of the first aspect, or the second aspect, or the third aspect, or any one of the possible designs of the fourth aspect, or the fourth aspect.

Optionally, the system-on-chip further comprises an interface circuit for interacting code instructions to the processor.

Optionally, the number of processors in the chip system may be one or more, and the processors may be implemented by hardware or software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like. When implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory.

Optionally, the memory in the system-on-chip may also be one or more. The memory may be integral to the processor or may be separate from the processor. Illustratively, the memory may be a non-transitory processor, such as a read only memory ROM, which may be integrated on the same chip as the processor or may be separately provided on different chips.

In a seventh aspect, embodiments of the present application provide a computer-readable storage medium, on which a computer program or instructions are stored, which, when executed, cause a computer to perform the method in the first aspect or any one of the possible designs of the first aspect, or the second aspect, or any one of the possible designs of the third aspect or the third aspect, or the fourth aspect, or any one of the possible designs of the fourth aspect.

In an eighth aspect, the present embodiments provide a computer program product, which, when read and executed by a computer, causes the computer to perform the method in the first aspect or any one of the possible designs of the first aspect, or the second aspect, or the third aspect, or any one of the possible designs of the fourth aspect, or the fourth aspect.

In a ninth aspect, an embodiment of the present application provides a communication system, which includes a network device and at least one terminal device. Optionally, the communication system may further include a core network device.

Drawings

Fig. 1 is a schematic diagram illustrating that URLLC service data seizes time-frequency resources for transmitting eMBB service data in the embodiment of the present application;

fig. 2 is a schematic diagram illustrating that uplink data transmission of an eMBB service is partially cancelled in the embodiment of the present application;

fig. 3 is a schematic network architecture of a communication system suitable for use in the embodiment of the present application;

fig. 4 is a flowchart illustrating a method for retransmitting data according to an embodiment of the present application;

fig. 5 is a schematic diagram of a terminal device performing uplink data preparation in an embodiment of the present application;

fig. 6 is a flowchart illustrating another method for retransmitting data according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 8 is another schematic structural diagram of a communication device according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 10 is another schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

The technical solution of the embodiment of the present application may be applied to various communication systems, for example, a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a fifth generation (5th generation, 5G) mobile communication system or a New Radio (NR) system, or may be applied to a future communication system or other similar communication systems.

Please refer to fig. 3, which is a schematic diagram of a network architecture of a communication system according to the present application. The communication system includes a core network device 310, a radio access network device 320, and at least one terminal device (e.g., terminal device 330 and terminal device 340 in fig. 3). The terminal equipment is connected with the wireless access network equipment in a wireless mode, and the wireless access network equipment is connected with the core network equipment in a wireless or wired mode. The core network device and the radio access network device may be separate physical devices, or the function of the core network device and the logical function of the radio access network device may be integrated on the same physical device, or a physical device may be integrated with a part of the function of the core network device and a part of the function of the radio access network device. The terminal equipment may be fixed or mobile. Fig. 3 is a schematic diagram, and the communication system may further include other network devices, such as a wireless relay device and a wireless backhaul device, which are not shown in fig. 3. The embodiment of the present application does not limit the number of core network devices, radio access network devices, and terminal devices included in the communication system.

It should be understood that the radio access network device mentioned in the embodiments of the present application may correspond to different devices in different communication systems, for example, in a 5G system, an access network device in 5G, such as a gNB or an ng-eNB, and in a 4G system, an access network device in 4G, such as an eNB or an en-gNB.

The embodiment of the application can be applied to uplink signal transmission and also can be applied to device-to-device (D2D) signal transmission. For uplink signal transmission, the transmitting device is a terminal device, and the corresponding receiving device is a radio access network device. For D2D signaling, the sending device is a terminal device and the corresponding receiving device is also a terminal device.

The radio access network device and the terminal device can communicate through a licensed spectrum, can communicate through an unlicensed spectrum, and can communicate through both the licensed spectrum and the unlicensed spectrum. The network device and the terminal device may communicate with each other through a frequency spectrum of 6 gigahertz (GHz) or less, through a frequency spectrum of 6GHz or more, or through both a frequency spectrum of 6GHz or less and a frequency spectrum of 6GHz or more. The embodiment of the application does not limit the frequency spectrum resources used between the network equipment and the terminal equipment.

It should be noted that the network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and as a person having ordinary skill in the art knows that along with the evolution of the communication network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

Some terms in the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.

1) The terminal device related in the embodiment of the application is a device with a wireless transceiving function. The terminal equipment is connected with the wireless access network equipment in a wireless mode so as to access the communication system. A terminal device may also be referred to as a terminal, User Equipment (UE), a mobile station, a mobile terminal, etc. The terminal device can be a mobile phone, a tablet computer, a computer with a wireless transceiving function, a virtual reality terminal device, an augmented reality terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in remote operation, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home and the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.

By way of example, and not limitation, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

The terminal device may also be an on-board module, an on-board component, an on-board chip or an on-board unit built into the vehicle as one or more components or units, by which the vehicle may implement the method of the present application.

2) The radio access network device related in the embodiment of the present application is a device in a network for accessing a terminal device to a radio network device. The radio access network device is a node in the radio access network, which may also be referred to as a base station, and may also be referred to as a RAN node (or device). The radio access network device may be a base station (base station), an evolved NodeB (eNodeB) in an LTE system or an evolved LTE system (LTE-Advanced, LTE-a), a next generation NodeB (gNB) in a 5G communication system, a Transmission Reception Point (TRP), a baseband unit (BBU), a WiFi Access Point (AP), a base station in a future mobile communication system or an access node in a WiFi system, and the like. The radio access network device may also be a module or unit that performs part of the functions of the base station, and may be, for example, a Centralized Unit (CU) or a Distributed Unit (DU). The embodiment of the present application does not limit the specific technology and the specific device form adopted by the radio access network device.

For example, in one network structure, the radio access network device may be a CU node, or a DU node, or an access network device including a CU node and a DU node. Specifically, the CU node is configured to support Radio Resource Control (RRC), Packet Data Convergence Protocol (PDCP), Service Data Adaptation Protocol (SDAP), and other protocols; the DU node is configured to support a Radio Link Control (RLC) layer protocol, a Medium Access Control (MAC) layer protocol, and a physical layer protocol.

The wireless access network equipment and the terminal equipment in the embodiment of the application can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on the water surface; it may also be deployed on airborne airplanes, balloons and satellite vehicles. The application scenarios of the network device and the terminal device are not limited in the embodiments of the present application.

It should be noted that the terms "system" and "network" in the embodiments of the present application may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present application. "at least one" is to be understood as meaning one or more, for example one, two or more. For example, the inclusion of at least one means that one, two or more are included, and does not limit which is included. For example, at least one of A, B and C is included, then inclusion can be A, B, C, A and B, A and C, B and C, or A and B and C. Similarly, the understanding of the description of "at least one" and the like is similar. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.

Unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing between a plurality of objects, and do not define the order, sequence, priority, or importance of the plurality of objects, and the descriptions of "first", "second", etc., do not define that the objects are necessarily different.

The data transmission in the embodiment of the present application may be data transmission based on a Code Block Group (CBG). For example, if the data transmission of the eMBB service is CBG-based transmission, a Code Block (CB) included in one Transport Block (TB) may be divided into several CBGs. As shown in fig. 2, when resources for transmitting the eMBB service data are preempted and uplink transmission of the eMBB service data is partially cancelled, the terminal device only needs to retransmit the part of the CBG that is not successfully transmitted, that is, CBG3 and CBG4 need to be retransmitted in fig. 2, and the whole TB does not need to be retransmitted.

However, when the upstream transmission is partially cancelled, the upstream data preparation of the cancelled CBG is also stopped. Since the generation of the TB Cyclic Redundancy Check (CRC) bit sequence requires all bit sequences in the TB and is not prepared before the uplink data starts to be transmitted, in such a scenario, the stop of the uplink data preparation of a part of the CBG may result in the TB CRC bit sequence not being successfully generated. During retransmission, since the network device only schedules the part of CBGs that are not successfully transmitted, the terminal device also cannot successfully generate a complete TB CRC bit sequence according to the part of CBGs that are scheduled for retransmission. In view of the above, the following provides a method for retransmitting data to solve the problem.

Please refer to fig. 4, which is a flowchart illustrating a method for retransmitting data according to an embodiment of the present application, the method including:

step S401, the network device sends first downlink control information to the terminal device, where the first downlink control information is used to schedule initial transmission of first uplink data, where the first uplink data includes a TB, and the TB is composed of a first bit sequence (b)₀,b₁,……b_L-1) Composition, L is a positive integer greater than 1.

Accordingly, the terminal device may receive the first downlink control information from the network device.

In this embodiment of the present application, the first uplink data may include one TB, or may include multiple TBs, and in this embodiment, the description is given by taking an example that the first uplink data includes one TB.

Step S402, the network device sends second downlink control information to the terminal device, the second downlink control information is used for scheduling and retransmitting a second bit sequence (b) in the first bit sequence_r,b_r+1,……b_L-1) And r is a positive integer.

Accordingly, the terminal device may receive the second downlink control information from the network device.

In the embodiment of the application, under a normal condition, after receiving the first downlink control information, the terminal device may perform corresponding uplink data preparation to generate uplink data to be sent. Specifically, the terminal device may determine how many CBs the TB needs to be divided into and how many bits from the first bit sequence are included in each CB block according to the number of bits of the first bit sequence and the number of bits of the TB CRC bit sequence constituting the TB. If the TB needs to be split into X CBs, as shown in fig. 5, the terminal device may split the first bit sequence into X parts (part) and concatenate the TB CRC bit sequence at the tail of the first bit sequence, i.e., after the xth part of the first bit sequence.

It is assumed that a part into which the first bit sequence is divided is referred to as a CB bit sequence. Subsequently, the terminal device may generate a corresponding CB CRC bit sequence for each CB bit sequence, where the length of each CB CRC bit sequence may be the same, and then concatenate the generated CB CRC bit sequences after the corresponding CB bit sequences to form a complete CB. For the last CB bit sequence, the terminal device may sequentially concatenate the TB CRC bit sequence and the CB CRC bit sequence corresponding to the last CB bit sequence after the last CB bit sequence to obtain a last complete CB. And finally, the terminal equipment can cascade the X CBs obtained after the processing to obtain the uplink data to be sent. Optionally, before the terminal device concatenates the X CBs, it may further perform channel coding, rate matching (bit interleaving), and other processing on each CB, and after the X CBs are concatenated, it may further perform symbol mapping, and then obtain uplink data to be sent, which is not described herein again. It should be noted that the specific time for the terminal device to generate the TB CRC bit sequence is not specifically limited in the embodiment of the present application, as long as the TB CRC bit sequence is ready before the last CB performs the transmission operations such as channel coding and rate matching.

Optionally, if the network device configures CBG-based transmission, the terminal device may further divide the X CBs into N CBGs according to the configured maximum CBG number, where each CBG may include 0 or 1 or multiple CBs, and N is a positive integer. In the case where CBG-based transmission is configured, when there are one or more CBs in the TBs that have not been successfully transmitted, the terminal device does not need to retransmit the entire TB, but may retransmit only the CBGs in which those CBs that have not been successfully transmitted are located.

It should be noted that, as can be seen from the above uplink data preparation process, X CBs may be generated according to the first bit sequence constituting the TB, and the X CBs may be further divided into N CBGs. Specifically, each CB includes a CB CRC bit sequence in addition to the CB bit sequence from the first bit sequence. And the last CB includes a TB CRC bit sequence and a CB CRC bit sequence in addition to the CB bit sequence from the first bit sequence. Specifically, if the TB includes only one CB, the uplink data to be transmitted is obtained only after generating a TB CRC bit sequence and concatenating the first bit sequence. For clarity of description, in the following description, the relationship between TB, CB and CBG may also be understood as that the TB includes X CBs, or the TB includes N CBGs, or the TB consists of X CBs, or the TB consists of N CBGs.

Specifically, before the network device sends the first downlink control information to the terminal device, the network device may send configuration information to the terminal device, where the configuration information is used to indicate CBG-based transmission. The configuration information may further include first information, where the first information indicates the maximum number T of CBGs included in the TB, and the N is less than or equal to the maximum number T of CBGs indicated in the first information. That is, in this embodiment of the application, the network device may start data transmission based on CBGs by issuing the configuration information to the terminal device, and configure the maximum number of CBGs included in each TB by using the first information included in the configuration information.

However, in one scenario, if the network device sends third downlink control information to the terminal device after sending the first downlink control information to the terminal device, where the third downlink control information indicates to cancel part of transmission of the TB, for example, to cancel transmission of part of CBGs in the TB, the uplink data preparation process may be interrupted, and may result in that the TB CRC bit sequence is not successfully generated. The third downlink control information may be understood as a Cancellation Indication (CI) or may be understood as scheduling information corresponding to another uplink transmission, where the priority of the another uplink transmission is higher than the priority corresponding to the transmission of the TB, and the another uplink transmission may be uplink data transmission or uplink control information transmission, and is not limited specifically.

In view of the partial cancellation of the transmission of the TB, the network device may schedule a retransmission of the partially cancelled data, i.e. as described in step S402 above, the network device may transmit second downlink control information to the terminal device, the second downlink control information being used for scheduling a retransmission of the second bit sequence of the first bit sequence. The second bit sequence refers to a bit sequence corresponding to the part of the CBG whose transmission is cancelled in the TB, and it should be noted that the bit sequence corresponding to the CBG specifically refers to those bits from the first bit sequence included in the CBG, and does not include bits in the CB CRC bit sequence or bits in the TB CRC bit sequence, which is not described in detail below. Further, according to the representation mode (b) of the second bit sequence_r,b_r+1,……b_L-1) It is noted that the part of CBGs which are de-transmitted includes at least the last CBG in the TB, for example, may include one or more subsequent CBGs in the TB.

Or, in another scenario, it is also possible that the terminal device successfully generates uplink data and sends the uplink data to the network device, but the network device does not receive at least one CBG in the TB, so that the network device needs to perform the step S402 to schedule retransmission of the second bit sequence in the first bit sequence.The second bit sequence refers to a bit sequence corresponding to at least one CBG that the network device does not receive. It should be noted that, here, the network device "does not receive" at least one CBG of the TBs may mean that, for each CBG of the at least one CBG, the network device does not receive one or more CBs included in the CBG, or the network device receives all CBs of the CBG, but decoding failure occurs in one or more CBs. In this scenario, the uplink data preparation process is not interrupted, and therefore, the terminal device successfully generates the TB CRC bit sequence. Further, according to the representation mode (b) of the second bit sequence_r,b_r+1,……b_L-1) It is noted that the at least one CBG not received by the network device includes at least the last CBG in the TB, for example, may include one or more subsequent CBGs in the TB.

Optionally, the second downlink control information may include second information, where the second information is used to indicate the second bit sequence. In a possible implementation, if the network device configures CBG-based transmission, the second information may be used to indicate M CBGs in the TB, and bit sequences corresponding to the M CBGs are the second bit sequences. And M is a positive integer smaller than N, namely the whole TB totally comprises N CBGs, the M CBGs refer to partial CBGs included in the TB, and the M CBGs comprise the last CBG in the N CBGs. It can be understood that the M CBGs refer to a part of the CBGs that need to be retransmitted in the TB, and may be CBGs that cannot be successfully transmitted by the terminal device due to partial cancellation of the previously scheduled uplink data transmission, or CBGs that cannot be successfully received by the network device due to decoding failure of the network device, which is not limited.

The embodiment of the present application does not specifically limit the way in which the second information indicates the M CBGs. In one example, the second information may be a bitmap (bitmap) with a length of T bits, and T bits in the bitmap respectively correspond to T CBGs that are most likely to be included in the TB in a one-to-one manner. When a certain bit is "1", it may indicate that the CBG corresponding to the bit needs to be transmitted in the current uplink data transmission, and when the bit is "0", it may indicate that the CBG corresponding to the bit does not need to be transmitted in the current uplink data transmission.

Optionally, the second downlink control information may further include third information, where the third information is used to indicate retransmission, that is, uplink data transmission scheduled by the second downlink control information is retransmission.

For example, as shown in fig. 2, one TB of the eMBB service includes several CBs divided into 4 CBGs, CBG1 to CBG 4. During the initial transmission of the TB, the time-frequency resources for transmitting CBG3 and CBG4 are preempted by data transmission of the URLLC service, thereby resulting in that the initial transmission of the TB is partially cancelled, specifically, uplink transmission of CBG3 and CBG4 in the TB is cancelled. In this scenario, the network device may schedule retransmission of the TB and indicate, through the first information, that 2 CBGs, CBG3 and CBG4, need to be retransmitted. When M is 2, the M CBGs are CBG3 and CBG 4.

It should be noted that fig. 2 is only an example, and fig. 2 can be applied in any scenario where low priority traffic can preempt transmission resources by high priority traffic, and cause transmission of low priority traffic to be partially or completely cancelled. Preemption may occur between different service transmissions of the same terminal device or between different terminal devices that perform different service transmissions. For cancellation between different service transmissions of the same terminal device, the network device indicates the priority of the service through a priority indication. For the preemption among different terminal devices with different service transmissions, the network device issues CI to instruct the terminal devices to cancel part or all of the transmissions.

Step S403, the terminal device generates second uplink data according to the second bit sequence and the first CRC bit sequence, or generates second uplink data according to the second bit sequence and the second CRC bit sequence.

The first CRC bit sequence is generated according to the second bit sequence, specifically, the TB CRC bit sequence generated by inputting the second bit sequence to the CRC generation module. Alternatively, the first CRC bit sequence may be generated from the bit sequences corresponding to the M CBGs, and refers to a TB CRC bit sequence generated by inputting the bit sequences corresponding to the M CBGs to the CRC generation module, and as shown in fig. 5, the bit sequence corresponding to the M CBGs refers to a sequence formed by all bits from the TB in all CBs corresponding to the M CBGs. Since the M CBGs are partial CBGs included in the TB, the first CRC bit sequence may also be referred to as a partial (partial) TB CRC bit sequence, or the first CRC bit sequence may also have other names, which is not limited in this application.

The second CRC bit sequence is generated from the first bit sequence, and specifically, is a TB CRC bit sequence generated by inputting the first bit sequence to the CRC generation module. Alternatively, the second CRC bit sequence may be generated from the entire TB, and may be a TB CRC bit sequence generated by inputting a bit sequence corresponding to the entire TB to the CRC generation module. This second CRC bit sequence may also be referred to as a TB CRC bit sequence.

Specifically, the step S403 refers to an uplink data preparation process performed by the terminal device after receiving the second downlink control information. In a possible implementation manner, since the second bit sequence is a partial bit sequence in the first bit sequence, the terminal device may directly generate the first CRC bit sequence according to the second bit sequence, and then generate the second uplink data to be transmitted according to the second bit sequence and the generated first CRC bit sequence. For a specific process, please refer to the description about fig. 5 above, which is not repeated herein.

In another possible implementation manner, if the terminal device further receives third downlink control information from the network device before receiving the second downlink control information, where the third downlink control information indicates that partial transmission of the first bit sequence is cancelled, the terminal device may generate second uplink data to be transmitted according to the second bit sequence and the first CRC bit sequence. It should be noted that if the terminal device further receives the third downlink control information from the network device before receiving the second downlink control information, it may indicate that the terminal device has not generated the second CRC bit sequence from the first bit sequence in the uplink data preparation process of the data transmission scheduled by the first downlink control information.

If the terminal device does not receive third downlink control information from the network device before receiving the second downlink control information, where the third downlink control information indicates to cancel partial transmission of the first bit sequence, the terminal device may generate second uplink data to be transmitted according to the second bit sequence and the second CRC bit sequence. It should be noted that if the terminal device does not receive the third downlink control information from the network device before receiving the second downlink control information, it may indicate that the terminal device has generated the second CRC bit sequence from the first bit sequence in the uplink data preparation process for the data transmission scheduled by the first downlink control information. For example, it is possible that the terminal device has performed one complete transmission of the first bit sequence, but due to a decoding failure occurring in the network device, a partial CBG in the TB needs to be retransmitted.

That is, if the terminal device does not generate the second CRC bit sequence according to the first bit sequence before receiving the second downlink control information, the terminal device may generate the first CRC bit sequence according to the second bit sequence, and then generate the second uplink data to be transmitted according to the second bit sequence and the generated first CRC bit sequence. If the terminal device has generated the second CRC bit sequence according to the first bit sequence before receiving the second downlink control information, the terminal device may generate the second uplink data to be transmitted according to the second bit sequence and the second CRC bit sequence generated before. Similarly, the specific process of the terminal device generating the second uplink data according to the second bit sequence and the first CRC bit sequence or the second CRC bit sequence may refer to the description about fig. 5 above, and is not repeated here.

And step S404, the terminal equipment sends the second uplink data to the network equipment.

Accordingly, the network device may receive the second uplink data sent by the terminal device, and decode the second uplink data.

In this embodiment, if the network device sends third downlink control information to the terminal device before sending the second downlink control information, and the third downlink control information indicates to cancel partial transmission of the first bit sequence scheduled by the first downlink control information, the network device may determine that the second uplink data is generated according to the second bit sequence and the first CRC bit sequence. If the network device does not send the third downlink control information to the terminal device before sending the second downlink control information, indicating that the partial transmission of the first bit sequence is cancelled, the network device may determine that the second uplink data is generated according to the second bit sequence and the second CRC bit sequence.

It can be understood that, if the initial transmission of the first bit sequence scheduled by the network device through the first downlink control information is partially cancelled, the uplink data preparation process of the terminal device is interrupted, the second CRC bit sequence is not successfully generated, and the network device does not receive the second CRC bit sequence. On the contrary, if the initial transmission of the first bit sequence scheduled by the network device through the first downlink control information is not partially cancelled, the uplink data preparation process of the terminal device is normally performed, and the terminal device may successfully generate the second CRC bit sequence according to the first bit sequence, generate corresponding uplink data according to the first bit sequence and the second CRC bit sequence, and send the corresponding uplink data to the network device. In this case, the network device may receive a second CRC bit sequence generated by the terminal device from the first bit sequence. It is to be understood that the reception of the second CRC bit sequence by the network device does not represent that the network device can correctly demodulate and decode the second CRC bit sequence, but only represents that the terminal device has transmitted the second CRC bit sequence to the network device.

Therefore, from another perspective, the network device may also determine whether the second uplink data is generated according to the second bit sequence and the first CRC bit sequence, or according to the second bit sequence and the second CRC bit sequence, according to whether the second CRC bit sequence generated by the terminal device according to the first bit sequence is received.

Specifically, if the network device does not receive the second CRC bit sequence generated according to the first bit sequence before transmitting the second downlink control information, the network device may determine that the second uplink data is generated according to the second bit sequence and the first CRC bit sequence. On the contrary, if the network device has received the second CRC bit sequence generated according to the first bit sequence before transmitting the second downlink control information, the network device may determine that the second uplink data is generated according to the second bit sequence and the second CRC bit sequence.

It should be noted that, here, the network device receiving the second CRC bit sequence generated according to the first bit sequence before transmitting the second downlink control information may indicate that the network device has previously scheduled the complete transmission of the TB and received the signal of the TB from the terminal device, but the TB is not correctly demodulated and decoded, for example, one or more CBs included in the TB may fail to be decoded. If the network device demodulates and decodes the TB received from the terminal device correctly, the network device will not send the second downlink control information any more, and schedule the terminal device for retransmission of the part of the TB.

In actual transmission, there is a CB-CRC false alarm problem, where a CB actually solves a wrong state, but the receiving device may mistakenly recognize that the CB is correctly solved if the CRC check passes. If the TB-CRC exists, which is equivalent to double insurance, if all CB-CRCs check correctly, but there are actually one or more CB-CRCs false alarms, that is, there are one or more CBs that do not actually have a solution pair, the TB may be known by the TB-CRC that there are not really all solution pairs, and if there is at least one CB that does not have a solution pair, the receiving device may notify the transmitting device to retransmit the TB. If there is no TB-CRC, then the above function is not available and the CB-CRC false alarm cannot be known. On the other hand, if the initial transmission of the terminal device is partially cancelled and the retransmission is only scheduled to transmit a partial TB sequence, the terminal is required to process the entire TB sequence to generate the conventional TB CRC, but actually only a partial TB sequence needs to be transmitted, so that the generation of the conventional TB CRC increases the implementation complexity of the terminal device in this case.

Therefore, by adopting the technical scheme provided by the application, when the network equipment schedules retransmission of a part of CBGs in one TB, the terminal equipment can generate second uplink data to be transmitted according to the second bit sequence to be retransmitted and the first CRC bit sequence or the second CRC bit sequence, and transmit the second uplink data to the network equipment. Therefore, the gain of the TB CRC can be obtained as much as possible, the performance loss caused by CB CRC false alarm is effectively reduced, and the complexity of realizing the terminal equipment can be reduced. For example, for a TB, in a scenario where the initial transmission of the TB is partially cancelled, through the above technical solution, the terminal device can successfully implement retransmission of a part of CBGs, and the terminal device can only make uplink data preparation according to the part of CBGs that need to be retransmitted, and does not need to make uplink data preparation according to the whole TB, thereby reducing complexity of terminal implementation.

Please refer to fig. 6, which is a schematic diagram of another method for retransmitting data provided by the present application, the method includes:

step S601, the network device generates downlink control information, where the downlink control information is used to schedule first uplink data, the first uplink data includes a TB, the TB includes N CBGs, the downlink control information includes second information and third information, the second information is used to indicate M CBGs of the N CBGs, the M CBGs include a last CBG of the N CBGs, the third information is used to indicate retransmission, and N and M are both positive integers.

For the TB in the first uplink data, according to the indication of the third information in the downlink control information, the uplink data transmission scheduled by the downlink control information is a retransmission of the TB, and the second information in the downlink control information is used to indicate M CBGs that need to be retransmitted in the TB.

Wherein, if the network device does not receive at least one CBG of the N CBGs before transmitting the downlink control information, M is equal to N. On the contrary, if the network device receives the N CBGs before sending the downlink control information, but at least one CBG of the N CBGs is not decoded successfully, M is less than or equal to N.

That is to say, in the embodiment of the present application, the operation of scheduling retransmission by the network device is constrained. For a TB, if the network device does not successfully schedule the transmission of the entire TB before scheduling the retransmission of the TB this time, that is, the network device does not receive at least one CBG of the N CBGs included in the TB before sending the downlink control information, the scheduling does not allow only the retransmission of a part of CBGs in the TB to be scheduled, but needs to schedule the retransmission of the entire TB. If the network device does not successfully schedule transmission of the entire TB before scheduling retransmission of the TB this time, it indicates that the terminal device has not generated a TB CRC bit sequence according to the information bit sequence corresponding to the TB before scheduling retransmission of the TB this time, for example, transmission of the entire TB scheduled at the time of initial transmission is partially or completely cancelled, which causes suspension of the uplink data preparation process, and the terminal device does not successfully generate the TB CRC bit sequence. In this case, if the network device only schedules retransmission of a part of CBGs in the TB during retransmission scheduled this time, the terminal device also cannot generate a TB CRC bit sequence according to a bit sequence in the scheduled part of CBGs during retransmission scheduled this time, which may affect generation of uplink data of the terminal device, and cause the terminal device to fail to obtain a TB CRC gain.

If the network device schedules the transmission of the entire TB before scheduling the retransmission of the TB this time, and the scheduled transmission of the entire TB is not partially or completely cancelled, but due to a decoding error failure or other reasons, the network device does not successfully decode at least one CBG of the N CBGs included in the TB and thus needs to retransmit, that is, the network device receives the N CBGs before sending the downlink control information, but the at least one CBG of the N CBGs is not successfully decoded, the network device may schedule the retransmission of a part of CBGs in the TB this time, and may also schedule the retransmission of the entire TB, without limitation. In this case, if the network device has successfully scheduled the transmission of the entire TB before, the terminal device has generated a TB CRC bit sequence from the information bit sequence corresponding to the TB in the previously scheduled transmission of the entire TB. No matter the network device schedules retransmission of only part of CBGs in the TB or schedules retransmission of the entire TB, the terminal device may generate second uplink data according to the TB CRC bit sequence generated before, and further obtain the TB-CRC gain.

Step S602, the network device sends downlink control information to the terminal device.

Accordingly, the terminal device may receive the downlink control information from the network device.

As described above, the downlink control information includes the second information, and the second information is used to indicate the M CBGs that need to be retransmitted in the data transmission of the current scheduling. Since the TB includes N CBGs in total, if M is equal to N, it indicates that the downlink control information schedules retransmission of the entire TB, or that the downlink control information schedules retransmission of all CBGs included in the TB. In this case, after receiving the downlink control information, the terminal device may perform data preparation according to a normal flow. Specifically, the terminal device may generate a second CRC bit sequence according to the information bit sequence corresponding to the TB, generate second uplink data according to the bit sequence corresponding to the TB and the generated second CRC bit sequence, and send the second uplink data to the network device.

And if M is less than N, indicating that the downlink control information schedules retransmission of part of CBGs in the TB. In this case, after receiving the downlink control information, the terminal device may perform corresponding detection on the reasonableness of the network device to schedule the retransmission, specifically please refer to the description about step S603 below. It should be noted that the description in step S603 is limited to the case where M is less than N, and the first information indicates the case where partial CBG retransmission in the TB is scheduled.

Step S603, if the terminal device does not generate the second CRC bit sequence according to the information bit sequence corresponding to the TB before receiving the downlink control information, the terminal device ignores the downlink control information.

The terminal device may ignore the downlink control information, and the terminal device discards the downlink control information. This means that the terminal device does not expect to receive the downlink control information for scheduling retransmission of part of CBGs in the TB before generating the second CRC bit sequence based on the information bit sequence corresponding to the TB. Or it can also be understood that the terminal device does not expect the network device to schedule retransmission of part of CBGs in the TB before successfully scheduling transmission of the entire TB.

Optionally, in this case, the terminal device may also report a scheduling error indication to the network device.

If the terminal device has generated the second CRC bit sequence according to the information bit sequence corresponding to the TB before the terminal device receives the downlink control information, the terminal device may generate the second uplink data according to the information bit sequences corresponding to the M CBGs scheduled this time and the second CRC bit sequence generated before, and send the second uplink data to the network device. For example, the network device has successfully scheduled the transmission of the entire TB before receiving the downlink control information, and during this transmission of the entire TB, the terminal device has generated the second CRC bit sequence from the information bit sequence corresponding to the TB when performing data preparation. However, since the network device decodes at least one CBG in the TB incorrectly, and the network device needs to schedule retransmission of the CBG of the part of the TB in which the decoding error occurs, during the retransmission, the terminal device may only perform uplink data preparation according to the information bit sequences corresponding to the M CBGs that need to be retransmitted and the second CRC bit sequence generated during the transmission of the entire TB before, so as to generate second uplink data.

Optionally, before the network device sends the downlink control information to the terminal device, the network device may also send the configuration information to the terminal device. The configuration information is used to indicate CBG-based transmission. The configuration information may further include first information indicating a maximum number of CBGs included in the TB. That is, in this embodiment of the present application, data transmission based on CBGs may be turned on by issuing the configuration information to the terminal device, and the number of CBGs included in each TB may be configured by using the first information included in the configuration information. Furthermore, after receiving the configuration information from the network device, the terminal device may divide the plurality of CBs included in the TB into the N CBGs according to the maximum number of CBGs included in the TB indicated by the first information. It is understood that the N value is less than or equal to the maximum number of CBGs indicated in the first information.

Therefore, by adopting the technical scheme provided by the application, the operation of scheduling retransmission of the network equipment is limited, and the network equipment is required to schedule at least one time of transmission of the complete TB before scheduling retransmission of the partial CBG, so that the terminal equipment can realize retransmission of the partial CBG scheduled at this time based on the second CRC bit sequence generated in the process of complete TB transmission before, and change of a processing strategy of the terminal equipment is effectively reduced.

Referring to fig. 7, a schematic structural diagram of a communication device according to an embodiment of the present invention is provided, where the communication device 700 includes: a transceiver module 710 and a processing module 720. The communication device can be used for realizing the functions related to the terminal equipment in any of the above method embodiments. For example, the communication device may be a terminal device, such as a handheld terminal device or a vehicle-mounted terminal device; the communication means may also be a chip or a circuit included in the terminal device, or a device including the terminal device, such as various types of vehicles and the like.

Illustratively, when the communication apparatus performs the operation or steps corresponding to the terminal device in the method embodiment shown in fig. 4, the transceiver module 710 is configured to receive first downlink control information from the network device, where the first downlink control information is used to schedule initial transmission of first uplink data, where the first uplink data includes a TB consisting of a first bit sequence (b)₀,b₁,……b_L-1) And (4) forming. The transceiver module 710 is further configured to receive second downlink control information from the network device, where the second downlink control information is used to schedule retransmission of a second bit sequence (b) in the first bit sequence_r,b_r+1,……b_L-1) And r is a positive integer. The processing module 720 is configured to generate second uplink data according to the second bit sequence and the first CRC bit sequence, or generate second uplink data according to the second bit sequence and the second CRC bit sequence, where the first CRC bit sequence is generated according to the second bit sequence, and the second CRC bit sequence is generated according to the first bit sequence. Transceiver module 710 alsoAnd the second uplink data is used for being sent to network equipment.

In one possible design, the processing module 720 is specifically configured to generate the second uplink data according to the second bit sequence and the first CRC bit sequence if the transceiver module 710 further receives third downlink control information from the network device before receiving the second downlink control information, where the third downlink control information indicates that partial transmission of the first bit sequence is cancelled.

In a possible design, the processing module 720 is specifically configured to, if the second CRC bit sequence is not generated according to the first bit sequence before the second downlink control information is received, the terminal device generates the second uplink data according to the second bit sequence and the first CRC bit sequence.

In one possible design, the processing module 720 is specifically configured to generate the second uplink data according to the second bit sequence and the second CRC bit sequence if the transceiver module 710 does not receive third downlink control information from the network device before receiving the second downlink control information, where the third downlink control information indicates that partial transmission of the first bit sequence is cancelled.

In one possible design, the processing module 720 is specifically configured to generate the second uplink data according to the second bit sequence and the second CRC bit sequence if the second CRC bit sequence has been generated according to the first bit sequence before receiving the second downlink control information.

In one possible design, the transceiver module 710 is further configured to receive configuration information from the network device, where the configuration information indicates CBG-based transmission, and the configuration information further includes first information indicating a maximum number of CBGs included in the TB.

When the communication apparatus performs the operation or step corresponding to the terminal device in the method embodiment shown in fig. 6, the transceiver module 710 is configured to receive downlink control information from the network device, where the downlink control information is used to schedule first uplink data, where the first uplink data includes a TB, the TB includes N CBGs, the downlink control information includes second information and third information, the second information is used to indicate M CBGs of the N CBGs, the M CBGs include a last CBG of the N CBGs, the third information is used to indicate retransmission, N and M are positive integers, and M is smaller than N; the processing module 720 is configured to ignore the downlink control information if the terminal device does not generate the second CRC bit sequence according to the information bit sequence corresponding to the TB before the transceiver module 710 receives the downlink control information.

In a possible design, the processing module 720 is further configured to, if the terminal device has generated the second CRC bit sequence according to the information bit sequence corresponding to the TB before receiving the downlink control information, generate the second uplink data according to the information bit sequences corresponding to the M CBGs and the second CRC bit sequence.

In one possible design, the transceiver module 710 is further configured to receive configuration information from the network device, where the configuration information indicates CBG-based transmission, and the configuration information includes first information indicating a maximum number of CBGs included in the TB.

The processing module 720 involved in the communication apparatus may be implemented by at least one processor or processor-related circuit component, and the transceiver module 710 may be implemented by at least one transceiver or transceiver-related circuit component or communication interface. The operations and/or functions of the modules in the communication apparatus are respectively for implementing the corresponding flows of the methods shown in fig. 4, fig. 5, or fig. 6, and are not described herein again for brevity. Optionally, the communication device may further include a storage module, the storage module may be configured to store data and/or instructions, and the transceiver module 710 and/or the processing module 720 may read the data and/or instructions in the access module, so as to enable the communication device to implement the corresponding method. The memory module may be implemented, for example, by at least one memory.

The storage module, the processing module and the transceiver module may be separated, or all or part of the modules may be integrated, for example, the storage module and the processing module are integrated, or the processing module and the transceiver module are integrated.

Please refer to fig. 8, which is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device may specifically be a terminal device, and the communication device may be configured to implement the functions related to the terminal device in any of the above method embodiments. For ease of understanding and illustration, in fig. 8, the terminal device is exemplified by a mobile phone. As shown in fig. 8, the terminal device includes a processor and may further include a memory, and of course, may also include a radio frequency circuit, an antenna, an input/output device, and the like. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 8. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, the antenna and the radio frequency circuit having the transceiving function may be regarded as a transceiving unit of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 8, the terminal device includes a transceiving unit 810 and a processing unit 820. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Optionally, a device used for implementing the receiving function in the transceiver 810 may be regarded as a receiving unit, and a device used for implementing the transmitting function in the transceiver 810 may be regarded as a transmitting unit, that is, the transceiver 810 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc. It should be understood that the transceiver 810 is configured to perform the transmitting operation and the receiving operation on the terminal device side in the above method embodiments, and the processing unit 820 is configured to perform other operations besides the transceiving operation on the terminal device in the above method embodiments.

Referring to fig. 9, a schematic structural diagram of another communication device provided in the embodiment of the present application is shown, where the communication device 900 includes: a transceiver module 910 and a processing module 920. The communication device can be used for realizing the functions related to the network equipment in any one of the method embodiments. For example, the communication means may be a network device or a chip or circuit included in the network device.

Illustratively, when the communication apparatus performs the operations or steps corresponding to the network device in the method embodiment shown in fig. 4, the transceiver module 910 is configured to send, to the terminal device, first downlink control information, where the first downlink control information is used to schedule initial transmission of first uplink data, where the first uplink data includes a TB, and the TB is composed of a first bit sequence (b)₀,b₁,……b_L-1) And (4) forming. The transceiver module 910 is further configured to send, to the terminal device, second downlink control information, where the second downlink control information is used to schedule retransmission of a second bit sequence in the first bit sequence, (b)_r,b_r+1,……b_L-1) And r is a positive integer. The processing module 920 is used for receiving through the transceiving module 910And second uplink data from the terminal device, the second uplink data being generated according to the second bit sequence and the first CRC bit sequence, or the second uplink data being generated according to the second bit sequence and the second CRC bit sequence, wherein the first CRC bit sequence is generated according to the second bit sequence and the second CRC bit sequence is generated according to the first bit sequence.

In one possible design, if the transceiver module 910 sends third downlink control information to the terminal device before sending the second downlink control information, where the third downlink control information indicates that partial transmission of the first bit sequence is cancelled, the processing module 920 may determine that the second uplink data is generated according to the second bit sequence and the first CRC bit sequence.

In one possible design, if the transceiver module 910 does not receive the second CRC bit sequence generated according to the first bit sequence before transmitting the second downlink control information, the processing module 920 may determine that the second uplink data is generated according to the second bit sequence and the first CRC bit sequence.

In one possible design, if the transceiver module 910 does not send third downlink control information to the terminal device before sending the second downlink control information, the third downlink control information indicating that partial transmission of the first bit sequence is cancelled, the processing module 920 may determine that the second uplink data is generated according to the second bit sequence and the second CRC bit sequence.

In one possible design, if the transceiver module 910 receives the second CRC bit sequence generated according to the first bit sequence before transmitting the second downlink control information, the processing module 920 may determine that the second uplink data is generated according to the first bit sequence and the second CRC bit sequence.

In one possible design, the transceiver module 910 is further configured to send, to the terminal device, configuration information indicating CBG-based transmission, where the configuration information includes first information indicating a maximum number of CBGs included in the TB.

When the communication apparatus executes the operation or step corresponding to the network device in the method embodiment shown in fig. 6, the processing module 920 is configured to generate downlink control information, where the downlink control information is used to schedule first uplink data, where the first uplink data includes a TB, the TB includes N CBGs, the downlink control information includes second information and third information, the second information is used to indicate M CBGs of the N CBGs, the M CBGs include a last CBG of the N CBGs, the third information is used to indicate retransmission, and N and M are both positive integers; wherein if transceiver module 910 does not receive at least one CBG of the N CBGs before transmitting the downlink control information, then M is equal to N; the transceiver module 910 is configured to send the downlink control information to a terminal device.

In one possible design, if the network device receives the N CBGs but at least one CBG of the N CBGs is not successfully decoded before the transceiver module 910 sends the downlink control information, then M is less than or equal to N.

In one possible design, the transceiver module 910 is further configured to send, to the terminal device, configuration information, where the configuration information is used to indicate CBG-based transmission, and the configuration information includes first information, where the first information is used to indicate a maximum number of CBGs included in the TB.

It should be understood that the processing module 920 involved in the communication apparatus may be implemented by at least one processor or processor-related circuit component, and the transceiver module 910 may be implemented by at least one transceiver or transceiver-related circuit component or communication interface. The operations and/or functions of the modules in the communication apparatus are respectively for implementing the corresponding flows of the methods shown in fig. 4, fig. 5, or fig. 6, and are not described herein again for brevity. Optionally, the communication device may further include a storage module, where the storage module may be configured to store data and/or instructions, and the transceiver module 910 and/or the processing module 920 may read the data and/or instructions in the access module, so as to enable the communication device to implement the corresponding method. The memory module may be implemented, for example, by at least one memory.

Please refer to fig. 10, which is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device may be specifically a network device, for example, a base station, and is configured to implement the functions related to the network device (such as the first network device or the target network device) in any of the above method embodiments.

The network device includes: one or more radio frequency units, such as a Remote Radio Unit (RRU) 1001 and one or more baseband units (BBUs) 1002. The RRU 1001 may be referred to as a transceiver unit, transceiver circuit, or transceiver, etc., which may include at least one antenna 10011 and a radio frequency unit 10012. The RRU 1001 section is mainly used for transceiving radio frequency signals and converting radio frequency signals and baseband signals. The BBU1002 part is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 1001 and the BBU1002 may be physically disposed together or may be physically disposed separately, that is, distributed base stations.

The BBU1002 is a control center of a base station, and may also be referred to as a processing unit, and is mainly used for performing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing unit) 1002 can be used to control a base station to execute the operation flow related to the network device in the above method embodiment.

In an example, the BBU1002 may be formed by one or more boards, where the boards may collectively support a radio access network (e.g., an LTE network) with a single access indication, or may respectively support radio access networks (e.g., LTE networks, 5G networks, or other networks) with different access schemes. The BBU1002 can also include a memory 10021 and a processor 10022, the memory 10021 being configured to store necessary instructions and data. The processor 10022 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the transmitting operation in the above-described method embodiment. The memory 10021 and the processor 10022 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

An embodiment of the present application further provides a chip system, including: a processor coupled to a memory for storing a program or instructions which, when executed by the processor, cause the system-on-chip to implement the method of the corresponding terminal device or the method of the corresponding network device in any of the above method embodiments.

Optionally, the system on a chip may have one or more processors. The processor may be implemented by hardware or by software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like. When implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory.

Optionally, the memory in the system-on-chip may also be one or more. The memory may be integrated with the processor or may be separate from the processor, which is not limited in this application. For example, the memory may be a non-transitory processor, such as a read only memory ROM, which may be integrated with the processor on the same chip or separately disposed on different chips, and the type of the memory and the arrangement of the memory and the processor are not particularly limited in this application.

The system-on-chip may be, for example, a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit (DSP), a Microcontroller (MCU), a Programmable Logic Device (PLD), or other integrated chips.

It will be appreciated that the steps of the above described method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

The embodiment of the present application further provides a computer-readable storage medium, where computer-readable instructions are stored in the computer-readable storage medium, and when the computer-readable instructions are read and executed by a computer, the computer is enabled to execute the method in any of the above method embodiments.

The embodiments of the present application further provide a computer program product, which when read and executed by a computer, causes the computer to execute the method in any of the above method embodiments.

An embodiment of the present application further provides a communication system, where the communication system includes a network device and at least one terminal device, and optionally, the communication system may further include a core network device.

It should be understood that the processor referred to in the embodiments of the present application may be a CPU, but may also be other general purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory referred to in the embodiments of the application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the various numerical references mentioned in the various embodiments of the present application are merely for convenience of description and differentiation, and the serial numbers of the above-mentioned processes or steps do not imply any order of execution, and the execution order of the processes or steps should be determined by their functions and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.

Claims

1. A method of retransmitting data, the method comprising:

receiving first downlink control information from a network device, the first downlink control information being used for scheduling initial transmission of first uplink data, the first uplink data comprising a transport block, TB, the TB consisting of a first bit sequence (b)₀,b₁,……b_L-1) Composition is carried out;

receiving second downlink control information from the network device, the second downlink control information being used for scheduling retransmission of a second bit sequence (b) of the first bit sequence_r,b_r+1,……b_L-1) R is a positive integer;

generating second uplink data according to the second bit sequence and a first Cyclic Redundancy Check (CRC) bit sequence, or generating second uplink data according to the second bit sequence and a second CRC bit sequence, wherein the first CRC bit sequence is generated according to the second bit sequence, and the second CRC bit sequence is generated according to the first bit sequence;

and sending the second uplink data to the network equipment.

2. The method according to claim 1, characterized in that it comprises:

and if third downlink control information from the network equipment is received before the second downlink control information is received, wherein the third downlink control information indicates that partial transmission of the first bit sequence is cancelled, generating the second uplink data according to the second bit sequence and the first CRC bit sequence.

3. The method according to claim 1, characterized in that it comprises:

and if the second CRC bit sequence is not generated according to the first bit sequence before the second downlink control information is received, generating second uplink data according to the second bit sequence and the first CRC bit sequence.

4. A method according to any one of claims 1 to 3, characterized in that the method comprises:

and if third downlink control information from the network equipment is not received before the second downlink control information is received, wherein the third downlink control information indicates that partial transmission of the first bit sequence is cancelled, generating the second uplink data according to the second bit sequence and the second CRC bit sequence.

5. A method according to any one of claims 1 to 3, characterized in that the method comprises:

generating second uplink data from the second bit sequence and the second CRC bit sequence if the second CRC bit sequence has been generated from the first bit sequence before receiving the second downlink control information.

6. The method according to any one of claims 1 to 5, further comprising:

receiving configuration information from the network device, where the configuration information indicates transmission based on a Coding Block Group (CBG), and the configuration information includes first information indicating a maximum number of CBGs included in the TB.

7. A method of retransmitting data, the method comprising:

sending first downlink control information to a terminal device, wherein the first downlink control information is used for scheduling initial transmission of first uplink data, the first uplink data comprises a Transport Block (TB), and the TB comprises a first bit sequence (b)₀,b₁,……b_L-1) Composition is carried out;

sending second downlink control information to the terminal device, the second downlink control information being used for scheduling retransmission of a second bit sequence (b) of the first bit sequence_r,b_r+1,……b_L-1) R is a positive integer;

receiving second uplink data from the terminal device, where the second uplink data is generated according to the second bit sequence and a first Cyclic Redundancy Check (CRC) bit sequence, or the second uplink data is generated according to the second bit sequence and a second CRC bit sequence, where the first CRC bit sequence is generated according to the second bit sequence, and the second CRC bit sequence is generated according to the first bit sequence.

8. The method of claim 7, wherein the second uplink data is generated according to the second bit sequence and the first CRC bit sequence if third downlink control information is sent to the terminal device before the second downlink control information is sent, wherein the third downlink control information indicates that partial transmission of the first bit sequence is cancelled.

9. The method of claim 7, wherein the second uplink data is generated according to the second bit sequence and the first CRC bit sequence if the second CRC bit sequence generated according to the first bit sequence has not been received before the second downlink control information is transmitted.

10. The method according to any of claims 7 to 9, wherein the second uplink data is generated from the second bit sequence and the second CRC bit sequence if no third downlink control information is sent to the terminal device before sending the second downlink control information, the third downlink control information indicating that partial transmission of the first bit sequence is cancelled.

11. The method according to any of claims 7 to 9, wherein the second uplink data is generated according to the first bit sequence and the second CRC bit sequence if the second CRC bit sequence generated according to the first bit sequence has been received before the second downlink control information is transmitted.

12. The method according to any one of claims 7 to 11, further comprising:

and sending configuration information to the terminal equipment, wherein the configuration information indicates the transmission based on the Coding Block Group (CBG), the configuration information comprises first information, and the first information indicates the maximum number of CBGs in the TB.

13. A communications apparatus, the apparatus comprising:

a transceiver module, configured to receive first downlink control information from a network device, where the first downlink control information is used to schedule initial transmission of first uplink data, and the first uplink data includes a transport block TB, where the TB is composed of a first bit sequence (b)₀,b₁,……b_L-1) Composition is carried out;

the transceiver module is further configured to receive second downlink control information from the network device, where the second downlink control information is used to schedule retransmission of a second bit sequence (b) of the first bit sequence_r,b_r+1,……b_L-1) R is a positive integer;

a processing module, configured to generate second uplink data according to the second bit sequence and a first Cyclic Redundancy Check (CRC) bit sequence, or generate second uplink data according to the second bit sequence and a second CRC bit sequence, where the first CRC bit sequence is generated according to the second bit sequence, and the second CRC bit sequence is generated according to the first bit sequence;

the transceiver module is further configured to send the second uplink data to the network device.

14. The apparatus of claim 13, wherein the processing module is specifically configured to:

15. The apparatus of claim 13, wherein the processing module is specifically configured to:

16. The apparatus according to any one of claims 13 to 15, wherein the processing module is specifically configured to:

17. The apparatus according to any one of claims 13 to 15, wherein the processing module is specifically configured to:

18. The apparatus according to any one of claims 13 to 17, wherein the transceiver module is further configured to:

19. A communications apparatus, the apparatus comprising:

a transceiver module, configured to send first downlink control information to a terminal device, where the first downlink control information is used to schedule initial transmission of first uplink data, and the first uplink data includes a transport block TB, where the TB is composed of a first bit sequence (b)₀,b₁,……b_L-1) Composition is carried out;

the transceiver module is further configured to send second downlink control information to the terminal device, where the second downlink control information is used to schedule retransmission of a second bit sequence (b) in the first bit sequence_r,b_r+1,……b_L-1) R is a positive integer;

a processing module, configured to receive, via the transceiver module, second uplink data from the terminal device, where the second uplink data is generated according to the second bit sequence and a first Cyclic Redundancy Check (CRC) bit sequence, or the second uplink data is generated according to the second bit sequence and a second CRC bit sequence, where the first CRC bit sequence is generated according to the second bit sequence, and the second CRC bit sequence is generated according to the first bit sequence.

20. The apparatus of claim 19, wherein the second uplink data is generated according to the second bit sequence and the first CRC bit sequence if third downlink control information is sent to the terminal device before the second downlink control information is sent, wherein the third downlink control information indicates that partial transmission of the first bit sequence is cancelled.

21. The apparatus of claim 19, wherein the second uplink data is generated according to the second bit sequence and the first CRC bit sequence if the second CRC bit sequence generated according to the first bit sequence has not been received before the second downlink control information is transmitted.

22. The apparatus according to any of claims 19 to 21, wherein the second uplink data is generated from the second bit sequence and the second CRC bit sequence if no third downlink control information is sent to the terminal device before sending the second downlink control information, the third downlink control information indicating that partial transmission of the first bit sequence is cancelled.

23. The apparatus according to any of claims 19 to 21, wherein the second uplink data is generated according to the first bit sequence and the second CRC bit sequence if the second CRC bit sequence generated according to the first bit sequence has been received before the second downlink control information is transmitted.

24. The apparatus according to any one of claims 19 to 23, wherein the transceiver module is further configured to:

25. An apparatus for communication, the apparatus comprising at least one processor coupled with at least one memory:

the at least one processor configured to execute computer programs or instructions stored in the at least one memory to cause the apparatus to perform the method of any one of claims 1 to 7 or to cause the apparatus to perform the method of any one of claims 8 to 12.

26. A computer-readable storage medium storing instructions that, when executed, cause the method of any one of claims 1 to 7 to be implemented, or cause the method of any one of claims 8 to 12 to be implemented.

27. A communication device comprising a processor and interface circuitry;

the interface circuit is used for interacting code instructions or data with the processor;

the processor is configured to perform the method of any one of claims 1 to 7 or the processor is configured to perform the method of any one of claims 8 to 12.