WO2023011090A1 - Procédé et appareil de retransmission d'informations de retour - Google Patents

Procédé et appareil de retransmission d'informations de retour Download PDF

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WO2023011090A1
WO2023011090A1 PCT/CN2022/103987 CN2022103987W WO2023011090A1 WO 2023011090 A1 WO2023011090 A1 WO 2023011090A1 CN 2022103987 W CN2022103987 W CN 2022103987W WO 2023011090 A1 WO2023011090 A1 WO 2023011090A1
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Prior art keywords
harq information
dci
pucch resource
harq
information
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PCT/CN2022/103987
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English (en)
Chinese (zh)
Inventor
丁洋
李锐杰
李胜钰
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华为技术有限公司
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Priority claimed from CN202111306570.XA external-priority patent/CN115707122A/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2023011090A1 publication Critical patent/WO2023011090A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular to a method and device for retransmitting feedback information.
  • the fifth generation ( 5th generation, 5G) communication system has higher requirements in terms of transmission rate, delay and power consumption.
  • the International Telecommunication Union (ITU) will enhance mobile broadband (enhanced Mobile Broadband, eMBB), massive machine type communication (massive machine type communication, mMTC) and ultra-reliable and low-latency communication (ultra-reliable and low-latency communication , URLLC) are defined as the three typical services of 5G.
  • the URLLC service is one of the three typical services of 5G.
  • Its main application scenarios include: driverless driving, telemedicine, etc. These application scenarios put forward stricter requirements in terms of reliability and delay.
  • the specific requirements of the URLLC service include: data transmission reliability of 99.999%, transmission delay of less than 1ms, and reducing instruction overhead as much as possible while meeting the requirements of high reliability and low delay.
  • a hybrid automatic repeat request (HARQ) mechanism is adopted to help ensure the reliability and delay of the URLLC service. How the UE retransmits the HARQ information is a technical problem to be solved in the embodiment of the present application.
  • Embodiments of the present application provide a method and device for retransmitting feedback information, so as to implement retransmission of HARQ information to a base station and improve reliability of feedback information transmission.
  • a method for retransmitting feedback information comprising: a terminal device receives a set of downlink control information DCI from a network device, and the first DCI in the set of DCI instructs the terminal device to retransmit First hybrid automatic repeat request HARQ information; the terminal device sends the first HARQ information to the network device.
  • the first DCI includes a first field
  • the first field is a field of a reused scheduled PDSCH
  • the first field is used to indicate configuration information of the first HARQ information.
  • the configuration information includes a time domain position of the first HARQ information.
  • the first DCI does not schedule the PDSCH, and the field of scheduling the PDSCH can be reused to indicate the configuration of the first HARQ information, saving DCI overhead.
  • the first DCI in the group of DCIs instructs the terminal device to retransmit the first HARQ information.
  • the first DCI is the DCI with the last time domain position in a group of DCIs.
  • only one DCI in a group of DCI indicates the retransmission of the first HARQ information, which can reduce the signaling overhead of the DCI.
  • each DCI in the other DCIs schedules a PDSCH respectively
  • the method further includes: the terminal device sends the second HARQ information to the network device , the second HARQ information includes HARQ feedback information of PDSCHs scheduled by other DCIs except the first DCI in the group of DCIs.
  • the terminal device determines a target PUCCH resource set from a preset physical uplink control channel PUCCH resource set according to the payload size of the first HARQ information and the payload size of the second HARQ information, and the The target PUCCH resource set includes at least one PUCCH resource; and according to the PUCCH resource indication PRI of the DCI with the last time domain position in the set of DCI, determine the first PUCCH resource in the target PUCCH resource set; further, The terminal device sends the first HARQ information and the second HARQ information to the network device by using the first PUCCH resource.
  • the terminal device determines a target PUCCH resource set from a preset PUCCH resource set according to the load size of the first HARQ information and the load size of the second HARQ information, and the target PUCCH resource include at least one PUCCH resource in the set;
  • the terminal device In the target PUCCH resource set, determine a second PUCCH resource; further, the terminal device sends the first HARQ information and the second HARQ information to the network device through the second PUCCH resource.
  • the terminal device determines a target PUCCH resource set from a preset PUCCH resource set according to the load size of the first HARQ information and the load size of the second HARQ information, and the target PUCCH resource include at least one PUCCH resource in the set;
  • the terminal device In the set of DCIs, only the first DCI instructs the terminal device to retransmit the first HARQ information, and the first HARQ information indicated by the first DCI is valid, then according to the first DCI PRI, determining a third PUCCH resource in the target PUCCH resource set; further, the terminal device sends the first HARQ information and the second HARQ information to the network device through the third PUCCH resource.
  • the first DCI also indicates a payload size of the first HARQ information.
  • the DCI of scheduling the PDSCH corresponding to the first HARQ information may be missed, so that the payload size of the first HARQ information determined by the terminal device is wrong.
  • the network device instructs the terminal device on the load size of the first HARQ information, so as to avoid the inconsistency between the terminal device and the network device on the load size of the first HARQ information, thereby avoiding affecting the network device's understanding of the second HARQ information. reception.
  • the second aspect provides a method for retransmitting feedback information, which is a method on the network device side corresponding to the first aspect, and its beneficial effect can refer to the beneficial effect of the first aspect.
  • the method includes: the network device sends a group of downlink control information DCI to the terminal device, and the first DCI in the group of DCI instructs the terminal device to retransmit the first hybrid automatic repeat request HARQ information; the network device receives the HARQ information from the The first HARQ information of the terminal device.
  • the first DCI includes a first field, the first field is a field of a reusable physical downlink shared channel PDSCH, and the first field is used to indicate the first HARQ information configuration information.
  • the first DCI in the set of DCIs instructs the terminal device to retransmit the first HARQ information
  • the first DCI is a time domain position in the set of DCIs The last DCI.
  • each DCI in the other DCIs schedules a PDSCH respectively
  • the method further includes: the network device receives the first DCI from the terminal device Two HARQ information, where the second HARQ information includes HARQ feedback information of PDSCHs scheduled by other DCIs in the group of DCIs except the first DCI.
  • the network device receiving the first HARQ information and the second HARQ information from the terminal device includes: the network device receiving the first HARQ information according to the load size of the first HARQ information and the second HARQ information
  • the load size of the HARQ information determines the target PUCCH resource set from the preset physical uplink control channel PUCCH resource set, and the target PUCCH resource set includes at least one PUCCH resource; the network device according to the time domain position in the set of DCI is the closest
  • the PUCCH resource indication PRI of the subsequent DCI determines the first PUCCH resource in the target PUCCH resource set; the network device receives the first HARQ information and the first PUCCH resource from the terminal device through the first PUCCH resource Two HARQ information.
  • the network device receiving the first HARQ information and the second HARQ information from the terminal device includes: the network device receiving the first HARQ information according to the load size of the first HARQ information and the second HARQ information
  • the load size of the HARQ information determines the target PUCCH resource set from the preset PUCCH resource set, and the target PUCCH resource set includes at least one PUCCH resource; only the first DCI in the set of DCI indicates the terminal device retransmit the first HARQ information, and the first HARQ information indicated by the first DCI is invalid, then the network device according to the set of DCIs except the first DCI, the time domain position closest to After the PRI of the DCI, the second PUCCH resource is determined in the target PUCCH resource set; the network device receives the first HARQ information and the second HARQ information from the terminal device through the second PUCCH resource .
  • the network device receiving the first HARQ information and the second HARQ information from the terminal device includes: the network device receiving the first HARQ information according to the load size of the first HARQ information and the second HARQ information
  • the load size of the HARQ information determines the target PUCCH resource set from the preset PUCCH resource set, and the target PUCCH resource set includes at least one PUCCH resource; only the first DCI in the set of DCI indicates the terminal device retransmit the first HARQ information, and the first HARQ information indicated by the first DCI is valid, then the network device determines a third PUCCH resource in the target PUCCH resource set according to the PRI of the first DCI The network device receives the first HARQ information and the second HARQ information from the terminal device through the third PUCCH resource.
  • the first DCI also indicates a payload size of the first HARQ information.
  • a device in the third aspect, and the beneficial effect can be referred to the description in the first aspect.
  • the device may be a terminal device, or a module configured in the terminal device, or other devices having functions of the terminal device.
  • the device includes a unit for executing the method described in the first aspect, and the unit may be a hardware circuit, or software, or a combination of hardware circuit and software.
  • the device may include a processing unit and a communication unit, and the processing unit and the communication unit may perform corresponding functions in any design example of the first aspect above, specifically:
  • a communication unit configured to receive a set of downlink control information DCI from a network device, each DCI in the set of DCI schedules a physical downlink shared channel PDSCH respectively, and the first DCI in the set of DCI also indicates the The terminal device retransmits the first hybrid automatic repeat request HARQ information;
  • a processing unit configured to determine first HARQ information and second HARQ information
  • the communication unit is further configured to send the first HARQ information and the second HARQ information to the network device, where the second HARQ information includes HARQ feedback information of the PDSCHs scheduled by the set of DCIs.
  • a device in a fourth aspect, includes a processor configured to implement the method described in the first aspect above.
  • the apparatus may also include memory for storing instructions and/or data.
  • the memory is coupled to the processor, and when the processor executes the program instructions stored in the memory, the method described in the first aspect above can be implemented.
  • the device may also include a communication interface for the device to communicate with other devices.
  • the communication interface may be a transceiver, circuit, bus, pin or other types of communication interface.
  • the device includes:
  • a communication interface configured to perform the functions of the communication unit in the third aspect above;
  • a processor configured to execute the functions of the processing unit in the above third aspect.
  • the device may be a network device, or a module configured in the network device, or other devices having the function of the network device.
  • the device includes a unit for executing the method described in the second aspect.
  • the unit may be a hardware circuit, or software, or may be implemented by combining hardware circuits with software.
  • the device may include a processing unit and a communication unit, and the processing unit and the communication unit may perform corresponding functions in any design example of the second aspect above, specifically:
  • a communication unit configured to send a set of downlink control information DCI to the terminal device, each DCI in the set of DCI schedules a physical downlink shared channel PDSCH respectively, and the first DCI in the set of DCI also instructs the terminal
  • the device retransmits the first hybrid automatic repeat request HARQ information; and, receives the first HARQ information and the second HARQ information from the terminal device, and the second HARQ information includes the set of DCI scheduled HARQ feedback information of the PDSCH.
  • a processing unit configured to process the first HARQ information and the second HARQ information.
  • the device includes a processor, configured to implement the method described in the second aspect above.
  • the apparatus may also include memory for storing instructions and/or data.
  • the memory is coupled to the processor, and when the processor executes the program instructions stored in the memory, the method described in the second aspect above can be implemented.
  • the device may also include a communication interface for the device to communicate with other devices.
  • the communication interface may be a transceiver, circuit, bus, pin or other types of communication interface.
  • the device includes:
  • a communication interface configured to perform the functions of the communication unit in the fifth aspect above;
  • a processor configured to execute the functions of the processing unit in the fifth aspect above.
  • the embodiment of the present application further provides a computer-readable storage medium storing instructions, and when the instructions are run on the communication device, the communication device is made to execute the method of the first aspect or the second aspect.
  • the embodiment of the present application further provides a chip system, where the chip system includes a processor and may further include a memory, for implementing the method of the first aspect or the second aspect.
  • the system-on-a-chip may consist of chips, or may include chips and other discrete devices.
  • the embodiments of the present application further provide a computer program product, including instructions, which, when run on a communication device, cause the communication device to execute the method of the first aspect or the second aspect.
  • the embodiment of the present application further provides a system, the system includes the device in the third aspect or the fourth aspect, and the device in the fifth aspect or the sixth aspect.
  • FIG. 1 is a schematic structural diagram of a mobile communication system applied in an embodiment of the present application
  • FIG. 2 is a schematic diagram of a scene provided by an embodiment of the present application.
  • FIG. 3a and FIG. 3b are schematic diagrams of HARQ feedback provided by the embodiment of the present application.
  • FIG. 4 is a schematic diagram of DCI missed detection provided by the embodiment of the present application.
  • FIG. 5 is a flowchart of a communication method provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of PUCCH resource mapping provided by an embodiment of the present application.
  • FIG. 7 to 9 are schematic diagrams of DCI indicating retransmission of the first HARQ information provided by the embodiments of the present application.
  • FIG. 10 and FIG. 11 are schematic diagrams of the device provided by the embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a communication system 1000 applied in an embodiment of the present application.
  • the communication system includes a radio access network 100 and a core network 200 , and optionally, the communication system 1000 may also include the Internet 300 .
  • the radio access network 100 may include at least one radio access network device (such as 110a and 110b in FIG. 1 ), and may also include at least one terminal (such as 120a-120j in FIG. 1 ).
  • the terminal is connected to the wireless access network device in a wireless manner, and the wireless access network device is connected to the core network in a wireless or wired manner.
  • the core network equipment and the wireless access network equipment can be independent and different physical equipment, or the functions of the core network equipment and the logical functions of the wireless access network equipment can be integrated on the same physical equipment, or it can be a physical equipment It integrates some functions of core network equipment and some functions of wireless access network equipment. Terminals and wireless access network devices may be connected to each other in a wired or wireless manner.
  • FIG. 1 is only a schematic diagram.
  • the communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG. 1 .
  • the radio access network equipment can be a base station (base station), an evolved base station (evolved NodeB, eNodeB), a transmission reception point (transmission reception point, TRP), and the next generation in the fifth generation (5th generation, 5G) mobile communication system
  • Base station (next generation NodeB, gNB), the next generation base station in the sixth generation (6th generation, 6G) mobile communication system, the base station in the future mobile communication system or the access node in the wireless fidelity (wireless fidelity, WiFi) system etc.; it can also be a module or unit that completes some functions of the base station, for example, it can be a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU).
  • the CU here completes the functions of the base station's radio resource control (radio resource control, RRC) protocol and packet data convergence protocol (PDCP), and can also complete the service data adaptation protocol (service data adaptation protocol, SDAP)
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • the function; the DU completes the functions of the radio link control (radio link control, RLC) layer and medium access control (medium access control, MAC) layer of the base station, and can also complete part of the physical (PHY) layer or all physical layers.
  • RLC radio link control
  • MAC medium access control
  • PHY physical
  • the radio access network device may be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), or a relay node or a donor node.
  • the embodiment of the present application does not limit the specific technology and specific equipment form adopted by the radio access network equipment.
  • the wireless access network device may be referred to as network device for short, and the following description uses a base station as an example of the network device.
  • a terminal may also be called terminal equipment, user equipment (user equipment, UE), mobile station, mobile terminal, and so on.
  • Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things ( internet of things, IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city, etc.
  • Terminals can be mobile phones, tablet computers, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc.
  • the embodiment of the present application does not limit the specific technology and specific device form adopted by the terminal.
  • UE is used as an example of a terminal for description below.
  • Base stations and terminals can be fixed or mobile. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and artificial satellites in the air. The embodiments of the present application do not limit the application scenarios of the base station and the terminal.
  • the helicopter or UAV 120i in FIG. base station for base station 110a, 120i is a terminal, that is, communication between 110a and 120i is performed through a wireless air interface protocol.
  • communication between 110a and 120i may also be performed through an interface protocol between base stations.
  • 120i compared to 110a, 120i is also a base station. Therefore, both the base station and the terminal can be collectively referred to as a communication device, 110a and 110b in FIG. 1 can be referred to as a communication device with a base station function, and 120a-120j in FIG. 1 can be referred to as a communication device with a terminal function.
  • the communication between the base station and the terminal, between the base station and the base station, and between the terminal and the terminal can be carried out through the licensed spectrum, the communication can also be carried out through the unlicensed spectrum, and the communication can also be carried out through the licensed spectrum and the unlicensed spectrum at the same time; Communications may be performed on frequency spectrums below megahertz (gigahertz, GHz), or communications may be performed on frequency spectrums above 6 GHz, or communications may be performed using both frequency spectrums below 6 GHz and frequency spectrums above 6 GHz.
  • the embodiments of the present application do not limit the frequency spectrum resources used for wireless communication.
  • the functions of the base station may also be performed by modules (such as chips) in the base station, or may be performed by a control subsystem including the functions of the base station.
  • the control subsystem including base station functions here may be the control center in the above application scenarios such as smart grid, industrial control, intelligent transportation, and smart city.
  • the functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or may be performed by a device including the terminal function.
  • the base station sends a downlink signal or downlink information to the terminal, and the downlink information is carried on the downlink channel;
  • the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on the uplink channel.
  • the terminal needs to establish a wireless connection with the cell controlled by the base station.
  • a cell with which a terminal has established a wireless connection is called a serving cell of the terminal.
  • the terminal communicates with the serving cell, it will also be interfered by signals from neighboring cells.
  • a physical downlink shared channel (physical downlink shared channel, PDSCH), a physical downlink control channel (physical downlink control channel, PDCCH), a physical uplink shared channel (physical uplink shared channel, PUSCH)
  • PDCCH physical downlink control channel
  • PUCCH physical uplink control channel
  • data channel and control channel There may be different names, which are not limited in the embodiments of the present application.
  • the HARQ technology is an efficient retransmission mechanism.
  • the basic principle is that the UE receives downlink data from the base station, and the downlink data can be carried on the PDSCH. If the UE correctly receives the downlink data, it will feed back a positive acknowledgment (acknowledgment, ACK) to the base station; if the UE does not correctly receive the downlink data, then the UE will feed back a negative acknowledgment (negative acknowledgment, NACK) to the base station.
  • the base station may retransmit the above-mentioned downlink data.
  • the transmission reliability of downlink data can be improved through retransmission; on the other hand, only when the UE feedbacks NACK, the base station needs to retransmit, which reduces the overall resource consumption of data transmission.
  • the ACK and NACK here may be referred to as HARQ feedback information, or may be simply referred to as HARQ information or feedback information.
  • the HARQ feedback process is as follows: the base station sends downlink control information (DCI) to the UE, the DCI instructs the UE to receive downlink data carried on the PDSCH, and sends a HARQ message for the downlink data.
  • the HARQ message of the downlink data may be carried on the PUCCH.
  • the base station indicates the transmission parameters of two downlink data through DCI 0 and DCI 1, and also indicates the PUCCH resources for feeding back the HARQ information of the two downlink data, namely: PUCCH 0 and PUCCH 1.
  • the UE may cancel the transmission of the HARQ information carried on PUCCH 0.
  • the UE may not discard the canceled HARQ information, but retransmit the canceled HARQ information to the base station. How the UE retransmits the above-mentioned canceled HARQ information to the base station is a technical problem to be solved in the embodiments of the present application.
  • the embodiment of the present application provides the following solution: the base station sends a set of DCI to the UE, and the first DCI in the set of DCI instructs the terminal device to retransmit the first HARQ information; The base station sends first HARQ information.
  • the UE feeds back HARQ information on an uplink slot (slot).
  • the mechanism of feeding back multiple HARQ information together on the same uplink time slot is adopted.
  • the UE can simultaneously feed back whether the multiple downlink data scheduled by the base station through multiple DCIs are received correctly.
  • the HARQ information corresponding to the downlink data can be concatenated together to form a HARQ codebook.
  • the base station sends 6 DCIs to the UE, and schedules PDSCH 1 to PDSCH 6 respectively.
  • the HARQ information corresponding to PDSCH 1 to PDSCH 3 is concatenated together to form the first HARQ codebook, and the first HARQ codebook is sent on PUCCH 1, which occupies the first sub-slot in slot n+3; PDSCH
  • the HARQ information corresponding to 4 to PDSCH6 is concatenated together to form a second HARQ codebook, and the second HARQ codebook is sent on PUCCH 2, and the PUCCH 2 occupies the second sub-slot in time slot n+3.
  • Each slot may include 2 sub-slots.
  • DAI Downlink assignment index
  • type 2 HARQ-ACK codebook (type 2HARQ-ACK codebook) feedback:
  • the UE may miss the DCI sent by the base station through the PDCCH.
  • the base station sends a certain DCI to the UE, but the UE does not receive the DCI, or does not correctly decode the DCI, which may result in one bit missing in the HARQ information fed back by the UE to the base station.
  • the base station sends 3 DCIs to the UE, and the HARQ information corresponding to the 3 DCIs is 3 bits.
  • the UE missed a DCI and the HARQ information fed back may be only 2 bits.
  • the base station does not know that the UE has not received the above-mentioned DCI, which may lead to inconsistencies between the UE and the base station in understanding the load size of the HARQ information.
  • the base station still divides and decodes the received data according to the load size of the expected HARQ information. This leads to decoding errors of subsequent HARQ information bits and even other types of subsequent uplink control information (UCI).
  • UCI uplink control information
  • the base station will introduce DAI into these DCIs to indicate the number of the current DCI, which is called counting DAI ( counter DAI, C-DAI).
  • Table 1 take the frame structure ratio of 10 time slots as 8:2, that is, DDDDDDDSUU as an example.
  • the indices of the 10 time slots are time slot 1 to time slot 10 in sequence.
  • the UE is scheduled to send 4 PDSCHs by DCI 0, DCI 1, DCI 2 and DCI 3 respectively, and these four DCIs point to the uplink time slot of time slot 10 to send HARQ information. If the four DCIs are all in the DCI format 1-0 or 1-1, then the values of the C-DAI fields in the four DCIs can be 1, 2, 3, and 4 in sequence.
  • DCI 3 After receiving DCI 0, DCI1, and DCI 4, the UE will recognize that the values of C-DAI are 1, 2, and 4, and thus know that DCI 3 is missed.
  • the UE When feeding back the HARQ information, the UE will fill in the missing DCI 3 bit position with NACK, and then feed it back to the base station to ensure that the load size and sequence of the HARQ information are correct.
  • DCI4 is missed by the UE, the DCI 0, DCI 1, and DCI 2 received by the UE correspond to C-DAI values of 1, 2, and 3, respectively. At this time, since the C-DAI values received by the UE are continuous, the UE cannot identify DCI 4 missed detection.
  • D represents downlink
  • U represents uplink
  • S represents a special time slot, including uplink and downlink switching points.
  • total DAI total DAI
  • T-DAI total DAI
  • the base station uses two carriers, namely carrier 1 and carrier 2, to send DCI to the UE.
  • the base station uses carrier 1 to send the first DCI to the UE, and the values of C-DAI and T-DAI of the first DCI are (1, 1) respectively.
  • the base station uses carrier 1 and carrier 2 to send the second DCI and the third DCI to the UE, the values of C-DAI and T-DAI of the second DCI are (2, 3) respectively, and the values of the third DCI
  • the values of C-DAI and T-DAI are (3, 3) respectively.
  • the base station uses carrier 1 and carrier 2 to send the fourth DCI and the fifth DCI to the UE respectively, the values of C-DAI and T-DAI of the fourth DCI are (4, 5) respectively, and the fifth DCI The values of C-DAI and T-DAI are (5, 5) respectively. If the UE misses detecting the third DCI, the UE may know that the UE missed detecting the third DCI according to the values of the C-DAI of the received DCI being 1, 2, 4, and 5 respectively. Alternatively, the UE may know that there should be a DCI indicating (3, 3) at this moment according to the T-DAI of the time slot 2.
  • the T-DAI of each time slot refers to the total number of DCIs sent before the end of each time slot.
  • the value of T-DAI of the second DCI received by the UE in time slot 2 is 3. But at the end of the second time slot, the UE only receives 2 DCIs, namely the first DCI and the second DCI. Therefore, the UE can determine that a DCI should be missed in the time slot 2, and the DAIs of the DCIs can be (3, 3) respectively.
  • the UE feeds back the HARQ codebook to the base station it can complete the HARQ information corresponding to this position.
  • the HARQ codebook fed back by the UE to the base station may specifically be (AN, AN, N, AN, AN), where AN represents ACK or NACK.
  • the N indicates NACK.
  • C-DAI and T-DAI can each occupy 2 bits in the DCI, because 2 bits can only represent 4 values, so modulo 4 processing is adopted. 00, 01, 10 and 11 cycle counts can be used for C-DAI and T-DAI.
  • DAI For a more detailed description of DAI, please refer to the descriptions in relevant chapters in 3GPP TS 38.212 and TS 38.213.
  • the Type1 HARQ-ACK codebook is fed back: that is, the semi-static codebook.
  • the HARQ of the PDSCH in the corresponding downlink time slot will be fed back according to the indication of the K1 set.
  • it includes not only the HARQ corresponding to the PDSCH that has been sent, but its real ACK or NACK is fed back, but also the HARQ that has the PDSCH transmission opportunity but no actual PDSCH data transmission, and the NACK is fed back.
  • these HARQs are sorted according to the rule of time sorting in the carrier first, and then according to the carrier sorting rule to form a HARQ codebook.
  • the feedback HARQ codebook totals 8 bits, and the sequence is (N, AN, N, AN). Wherein, N represents the transmission of NACK, and AN represents the transmission of the actual ACK or NACK corresponding to the PDSCH.
  • the K1 set is ⁇ 1,2 ⁇
  • only the HARQ feedback corresponding to the PDSCH of the downlink time slot with the uplink time slot interval of 1 and 2 is fed back, and the order of the feedback HARQ is ⁇ N, AN, N, AN ⁇ .
  • the aforementioned K1 set is preconfigured or predefined.
  • the UE needs to feedback the HARQ information according to the K1 set.
  • the above K1 set is ⁇ 1, 2 ⁇ , and the terminal sends HARQ information in time slot 5 of carrier 1, which means that the terminal needs to feed back the HARQ feedback of the position 1 time slot and 2 time slots away from the above time slot 5 .
  • the time slots one and two times away from the above-mentioned time slot 5 are respectively time slot 3 and time slot 4 .
  • the UE can feed back the HARQ feedback corresponding to the time slot 3 and the time slot 4.
  • the finally fed back HARQ information is (N, AN, N, AN).
  • the UE For the type 1 HARQ-ACK codebook fed back on the PUCCH, there may be two codebook composition methods. If the UE detects only 1 HARQ bit, that is, only one DCI schedules a PDSCH, then the UE will not form a complete codebook, but only feeds back 1-bit HARQ-ACK. If multiple DCIs schedule PDSCH, that is, the UE If the number of detected HARQ bits is more than 1 bit, the UE feeds back a complete type1 HARQ-ACK codebook.
  • the UE may only feed back 1 bit HARQ information, but the base station considers it to be a complete type 1 code This is decoded, resulting in an error.
  • a unit of a time unit may be a radio frame, a subframe, a time slot, a sub-slot, or a symbol.
  • One radio frame may include one or more subframes, and one subframe may include one or more time slots.
  • a slot may consist of one or more symbols. For example, a time slot under a normal cyclic prefix (CP) may include 14 time domain symbols, and a time slot under an extended CP may include 12 time domain symbols. A time-domain symbol may be simply called a symbol.
  • CP normal cyclic prefix
  • the time-domain symbol can be an orthogonal frequency division multiplexing (OFDM) symbol, or an orthogonal frequency division multiplexing (discrete fourier transform spread orthogonal frequency division multiplexing, DFT-s-s- OFDM) symbols.
  • a sub-slot is also called a mini-slot or a mini-slot, which may be a unit smaller than a time slot, and a sub-slot may include one or more symbols.
  • a sub-slot may include 2 symbols, 4 symbols or 7 symbols and so on.
  • a slot may include one or more sub-slots.
  • the embodiment of the present application provides a method for retransmitting feedback information, at least including the following steps:
  • Step 500 the base station sends a set of DCI to the UE, and correspondingly, the UE receives a set of DCI from the base station.
  • the above group of DCIs may be composed of DCIs satisfying certain rules.
  • the set of DCI includes a first DCI, and the first DCI is used to instruct the UE to retransmit the first HARQ information.
  • the first DCI in the set of DCI instructs the UE to retransmit the first HARQ information.
  • the first DCI may be the last DCI in the time domain.
  • each DCI in the other DCIs schedules a PDSCH respectively.
  • the HARQ feedback information of the PDSCHs scheduled in the group of DCIs is fed back on the same time unit or on the same PUCCH resource.
  • HARQ feedback information of PDSCHs scheduled by other DCIs form a HARQ codebook, which is called second HARQ information.
  • the HARQ feedback information indicated by each DCI in this group of DCIs is fed back on the same time unit or on the same PUCCH resource, but the first DCI in this group of DCIs does not schedule the PDSCH, but only indicates the The retransmission of the first HARQ information is also fed back on the same time unit or the same PUCCH resource as the PDSCH scheduled by other DCIs.
  • the above-mentioned first DCI may include a first field, the first field is a field of the reused scheduling PDSCH, and the first field may be used to indicate configuration information of the first HARQ information.
  • the configuration information includes a time domain position for retransmitting the first HARQ information. Since the first DCI does not schedule PDSCH, the field originally used to indicate the scheduling of PDSCH in the first DCI can be used to carry the configuration information of the first HARQ information, that is, reuse the field of scheduling PDSCH, and the first field is used for Indicates configuration information of the first HARQ information.
  • DCI when scheduling PDSCH, DCI includes modulation and coding scheme (modulation and coding scheme, MCS) field 5bits, new data indicator (new data indicator, NDI) field 1bit, redundancy version (redundancy version, RV) field 2bit , HARQ process number (HARQ process number, HPN) field 4bit, etc.
  • MCS modulation and coding scheme
  • NDI new data indicator
  • RV redundancy version
  • RV redundancy version
  • HPN HARQ process number
  • the first DCI does not schedule the PDSCH and indicates retransmission of the first HARQ information
  • the above one or more fields may be used to indicate configuration information for retransmission of the first HARQ information.
  • the MCS field may be used to indicate the time domain position for retransmitting the first HARQ information, and the like.
  • the base station sends 6 DCIs to the UE, the first 5 DCIs schedule PDSCH1 to PDSCH5, and the last DCI (ie DCI6) does not schedule PDSCH, but indicates retransmission of the first HARQ information.
  • PDSCH 4, PDSCH 5 and the retransmitted first HARQ information are concatenated together to form the second HARQ codebook, and the second HARQ codebook is sent on PUCCH 2, which occupies the second sub-time in slot n+3 Gap.
  • the DCI 4 to DCI 6 may be called a set of DCI, and the HARQ information corresponding to the PDSCH 4 to PDSCH 5 scheduled by the DCI 4 to DCI 5 may be called the second HARQ information.
  • each DCI in the group of DCIs schedules a PDSCH respectively, and the HARQ feedback information of the PDSCHs scheduled by the group of DCIs is fed back in the same time unit or the same PUCCH resource.
  • the HARQ feedback information of the PDSCH scheduled by this group of DCI forms a HARQ codebook, which may be called the second HARQ information.
  • the first DCI in the foregoing group of DCIs may also instruct the UE to retransmit the first HARQ information.
  • the first HARQ information may be HARQ information previously canceled by the UE for transmission. For example, because the PUCCH resource of the first HARQ information conflicts with the PUCCH resources of other HARQ information, and the priority of the first HARQ information is low, the transmission of the first HARQ information is canceled.
  • the base station sends 6 DCIs to the UE, and schedules PDSCH 1 to PDSCH 6 respectively.
  • the HARQ information corresponding to PDSCH 1 to PDSCH 3 is concatenated together to form the first HARQ codebook, and the first HARQ codebook is sent on PUCCH 1, which occupies the first sub-slot in slot n+3; PDSCH
  • the HARQ information corresponding to PDSCH 4 to PDSCH 6 is concatenated together to form a second HARQ codebook, and the second HARQ codebook is sent on PUCCH 2, and the PUCCH 2 occupies the second sub-slot in time slot n+3.
  • Each slot may include 2 sub-slots.
  • DCI 1 to DCI 3 may be called a set of DCIs, or DCI 4 to DCI 6 may also be called a set of DCIs.
  • DCI 1 to DCI 3 as a group of DCI as an example, the HARQ information corresponding to PDSCH 1 to PDSHC 3 scheduled by DCI 1 to DCI 3 may be called the second HARQ information.
  • At least one DCI among DCI 1 to DCI 3 may also indicate retransmission of the first HARQ information and the like.
  • Step 501 The UE sends the first HARQ information and the second HARQ information to the base station, and the second HARQ information includes the HARQ feedback information of the PDSCH scheduled by the above-mentioned group of DCIs.
  • the UE may determine a target PUCCH resource set from a preset PUCCH resource set according to the payload size (payload size) of the first HARQ information and the payload size of the second HARQ information, and the target PUCCH resource set includes At least one PUCCH resource; according to the PUCCH resource indicator (PUCCH resource indicator, PRI) of the DCI with the last time domain position in the group of DCIs, in the target PUCCH resource set, determine the first PUCCH resource; UE through the first PUCCH resource , sending the first HARQ information and the second HARQ information to the base station.
  • PUCCH resource indicator PUCCH resource indicator
  • the DCI 3 is the DCI with the last time domain position in the group of DCIs.
  • the last DCI in the time domain position in a group of DCIs may refer to the last DCI of the start symbol of the PDCCH carrying the DCI, or the last DCI of the end symbol of the PDCCH carrying the DCI in a group of DCIs sent by the base station .
  • the UE may determine the first PUCCH resource in the target PUCCH resource set according to the PRI in DCI 3.
  • each PUCCH resource set in the aforementioned preset PUCCH resource set may be configured by the base station to the UE through high-level signaling, such as RRC signaling, or may also be specified by a protocol.
  • the UE may calculate the sum of the payload size of the first HARQ information and the payload size of the second HARQ information.
  • the PUCCH resource set corresponding to the sum of the load sizes of the above two HARQ information is determined, which is called the target PUCCH resource set.
  • the PRI in the last DCI in the time domain position in a group of DCIs may be used to indicate a specific PUCCH resource in the PUCCH resource set.
  • the UE may determine a PUCCH resource for transmitting the first HARQ information and the second HARQ information in the target PUCCH resource set according to the PRI of the last DCI in the time domain in a group of DCIs, that is, the above-mentioned first PUCCH resource.
  • each PUCCH resource set includes a maximum of 8 PUCCH resources.
  • the PRI in the DCI can occupy 3 bits, and the above 3 bits can be used to indicate a specific PUCCH resource in the PUCCH resource set.
  • the PUCCH resources may include time-domain symbols and frequency resource blocks (resource block, RB) occupied by the PUCCH in the uplink time slot.
  • the UE may determine a PUCCH resource, and send the first HARQ information and the second HARQ information on the PUCCH resource.
  • the base station may determine the PUCCH resource in a manner similar to the above, and receive the first HARQ information and the second HARQ information on the PUCCH resource.
  • the base station can determine the target PUCCH resource set according to the sum of the load sizes of the first HARQ information and the second HARQ information; according to the PRI of the DCI with the last time domain position in a group of DCIs, in the target PUCCH resource set, determine to receive PUCCH resources for the first HARQ information and the second HARQ information, and receive the first HARQ information and the second HARQ information on the PUCCH resources.
  • the UE may determine a target PUCCH resource set from a preset PUCCH resource set according to the payload size (payload size) of the first HARQ information and the payload size of the second HARQ information, and the target PUCCH resource set including at least one PUCCH resource;
  • the PRI of the DCI with the last time domain position except the first DCI determines the second PUCCH resource in the target PUCCH resource set; the UE sends the first HARQ information to the base station through the second PUCCH resource and second HARQ information.
  • the PRI determines the third PUCCH resource in the target PUCCH resource set; the UE sends the first HARQ information and the second HARQ information to the base station through the third PUCCH resource.
  • the invalidity may mean that the base station indicates through the first DCI the position of an uplink time slot where the canceled HARQ-ACK exists, but the UE does not find the HARQ-ACK codebook to be retransmitted on this uplink time slot (HARQ-ACK codebook used to bear the first HARQ-ACK information). It may be due to reasons such as missing DCI detection, the UE has never generated this codebook.
  • the validity here may be that the first DCI indicates the position of the uplink time slot, and the UE finds the canceled HARQ-ACK codebook at the position of the uplink time slot.
  • the method for the base station to determine the payload size of the first HARQ information and the payload size of the second HARQ information may include: the base station determines that in a group of DCI corresponding to the first HARQ information The number of included DCIs, each DCI schedules a PDSCH, each PDSCH corresponds to a piece of HARQ information, each HARQ information occupies 1 bit, and the number of DCIs included in this group of DCIs is the payload size of the first HARQ information. As shown in FIG.
  • the DCI 0 corresponding to the first HARQ information is a group of DCIs, including 5 DCIs, and the payload size of the first HARQ information may be 5.
  • the base station may determine the payload size of the second HARQ information according to the number of DCIs included in the set of DCIs in step 500 above.
  • a manner for the UE to determine the load size of the first HARQ information and the second HARQ information may include: in one design, the first DCI may further indicate the load size of the first HARQ information.
  • the UE may determine the load size of the first HARQ information according to the indication of the first DCI.
  • the first HARQ information was previously canceled by the UE for some reason, and the specific content and payload size of the first HARQ information can be known to the UE, and the UE can use the previously stored first HARQ information, determining the load size of the first HARQ information and so on.
  • the UE determines that the first HARQ information is specifically (ACK, ACK, NACK). Because in specific transmission, ACK and NACK can be represented by 1 and 0 respectively, each occupying 1 bit. The UE may determine that the payload size of the first HARQ information is 3. In this solution, it may be affected by missed detection of DCI, so that the determined first HARQ information lacks a certain bit, and the load size of the first HARQ information determined based on this method may not be accurate.
  • the payload size of the second HARQ information may be equal to the number of DCIs included in the group of DCIs. For example, a set of DCIs includes 5 DCIs, and the 5 DCIs respectively instruct the UE to receive PDSCH 1 to PDSCH 5, and to send the HARQ information of the above 5 PDSCHs. At this time, the payload size of the second HARQ information is 5.
  • the method for the base station to determine the load size of the first HARQ information may include: the base station also determines the composition of the first HARQ information according to the first time domain position set (that is, the aforementioned K1 set). Corresponding PDSCH; if more than one PDSCH needs to feed back HARQ information, the first HARQ information is a complete type 1 codebook; if only one PDSCH needs to feed back HARQ information, that is, only one DCI schedules PDSCH, then the first HARQ The information is 1bit. Similarly, the base station may also determine the load size of the second HARQ information according to the first time domain position set.
  • the manner in which the UE determines the load size of the first HARQ information and the second HARQ information may include: the first DCI may further indicate the load size of the first HARQ information. For example, it indicates whether the payload size of the first HARQ information is 1 bit or a complete type 1 codebook size.
  • the UE may determine the load size of the first HARQ information according to the indication of the first DCI.
  • the first HARQ information was previously canceled by the UE for some reason, and the specific content and payload size of the first HARQ information can be known to the UE, and the UE can use the previously stored first HARQ information, determining the load size of the first HARQ information and so on.
  • the foregoing first HARQ information and the second HARQ information may be encoded independently. After the first HARQ information and the second HARQ information are encoded, they may be mapped to PUCCH resources for transmission.
  • the PUCCH resource can be divided into at least one group of time-frequency resources according to the distance from a demodulation reference signal (demodulation reference signal, DMRS).
  • DMRS demodulation reference signal
  • the UE may first map the encoded bit sequence of the second HARQ information to the PUCCH resource according to the size of at least one group of time-frequency resource indexes, and then map the encoded bit sequence of the first HARQ information to the PUCCH resource.
  • the encoded bit sequence of the first HARQ information is concatenated after the encoded bit sequence of the second HARQ information. This is based on the consideration that the retransmitted first HARQ information should not affect the reception of the normally transmitted second HARQ information.
  • the PUCCH resources include 10 time-domain symbols, with indexes ranging from 0 to 9 in sequence, and each time-domain symbol includes 10 time-frequency resources.
  • Time-domain symbol 2 and time-domain symbol 7 are DMRS symbols, which can be referred to the black filled part in FIG. 7 .
  • the two groups of time-frequency resources closest to the DMRS symbols, or the time-frequency resources separated by 1 symbol from the DMRS symbols, are called the first group of time-frequency resources (see the hatched part in Figure 7), and the rest are The second group of time-frequency resources (see the unfilled part in FIG. 7 ).
  • the UE may first map the second HARQ information and then map the first HARQ information according to the sequence of the first group of time-frequency resources and the second group of time-frequency resources, That is, after the second HARQ information is mapped, the first HARQ information is mapped again.
  • the first HARQ information and the second HARQ information may be concatenated into one HARQ codebook.
  • the UE may jointly encode the first HARQ information and the second HARQ information.
  • the first DCI may indicate the load size of the first HARQ information, so as to prevent the reception of the second HARQ information by the base station from being affected by the inaccuracy of the load size of the first HARQ information.
  • the embodiment of the present application provides an application scenario: as shown in Figure 2, the base station sends DCI 0 and DCI 1 to the UE, since the PUCCH 0 indicated by DCI 0 is identical to the PUCCH 1 indicated by DCI 1 If there is a conflict, and the priority of the HARQ information corresponding to the PDSCH scheduled by DCI 0 is lower than the priority of the HARQ information corresponding to the PDSCH scheduled by DCI 1, the UE cancels sending the corresponding HARQ information on PUCCH 0, and the HARQ information that should be cancelled. It may be referred to as the first HARQ information in the process shown in FIG. 5 above.
  • a set of DCIs may be determined, and at least one DCI in the set of DCIs carries an indication to retransmit the first HARQ information.
  • the indication to retransmit the first HARQ information may be an implicit indication. For example, an existing bit field in the DCI may be used to implicitly indicate whether the UE retransmits the first HARQ information or the like. Alternatively, show directions.
  • a new bit field may be added in the DCI, and the value of the bit field is the first value, for example, when 1, the UE may be instructed to retransmit the first HARQ information; or, the value of the bit field is the second value, For example, when 0, the UE may be instructed not to retransmit the first HARQ information, etc.; or, according to whether the bit field exists to indicate whether to retransmit the first HARQ information, when the bit field exists, the UE is instructed to retransmit the first HARQ information, When the bit field does not exist, the UE is not instructed to retransmit the first HARQ information.
  • the time when the base station decides to retransmit the first HARQ information must be later than the time when the base station knows that the first HARQ message is canceled before transmission.
  • the earliest time when the base station knows that the first HARQ information is canceled may be the time when the base station sends DCI 1 in FIG. 2 .
  • the base station sends DCI 1 the DCI indicates PUCCH 1.
  • the base station knows that the HARQ information corresponding to PUCCH 1 indicated by DCI 1 will cancel the HARQ information corresponding to PUCCH 0 previously scheduled by DCI 0, but for some reason, the base station still sends DCI 1.
  • Example 1 the first DCI is the DCI with the last time domain position in the group of DCIs.
  • the base station may send a group of DCIs to the UE, and the group of DCIs includes 5 DCIs, which may be respectively referred to as the first DCI to the fifth DCI according to the sequence in the time domain.
  • the HARQ information corresponding to the PDSCH scheduled by the first DCI to the fifth DCI is combined into the second HARQ information.
  • the fifth DCI also instructs the UE to retransmit the first HARQ information.
  • the above-mentioned fifth DCI may be referred to as the first DCI in step 500 .
  • only one DCI in a group of DCIs is used to instruct the UE to retransmit the first HARQ information, which can save signaling overhead of the DCI.
  • At least one DCI in the above step 500 includes at least two DCIs to instruct the UE to retransmit the first HARQ information.
  • the at least two DCIs are continuous or discontinuous DCIs in the time domain, which is not limited.
  • multiple DCIs consecutive in time domain may be used in a group of DCIs to instruct the UE to retransmit the first HARQ information.
  • it may be N consecutive DCIs with lower time domain positions in a group of DCIs.
  • the UE since PUCCH 0 collides with PUCCH 1, the UE cancels sending HARQ information on PUCCH 0.
  • the base station sends a group of DCIs to the UE, and the group of DCIs includes 5 DCIs, which are respectively referred to as the first DCI to the fifth DCI according to the receiving sequence in time.
  • the UE may be instructed to retransmit the first HARQ information.
  • the reliability of the indication can be enhanced by adopting the manner in which multiple DCIs simultaneously instruct the UE to retransmit the first HARQ information.
  • N is explained as follows: In a special design, the value of N above can be equal to the number of DCIs included in the set of DCIs, that is, each DCI in the set of DCIs instructs the UE to retransmit the first HARQ information . It should be noted that the above value of N is less than or equal to the number of DCIs included in the group of DCIs.
  • multiple DCIs with discontinuous time domains may be used in a group of DCIs to instruct the UE to retransmit the first HARQ information.
  • the UE cancels the sending of HARQ information on PUCCH 0.
  • the base station sends a group of DCIs to the UE, and the group of DCIs includes 5 DCIs, which are respectively referred to as the first DCI to the fifth DCI in sequence in the time domain.
  • the base station may instruct the UE to retransmit the above-mentioned canceled HARQ information in the first DCI and the third DCI.
  • the DCI indicating retransmission of the first HARQ information in a group of DCIs does not include the last DCI in the group of DCIs.
  • the payload size of the first HARQ information may also be indicated.
  • the UE may send the first HARQ information to the base station based on the load size of the first HARQ information.
  • inaccurate payload size of the first HARQ information can be avoided from affecting reception of the second HARQ information.
  • DCI0 may include multiple DCIs. Among the multiple DCIs, especially the last DCI, if a missed detection occurs, the UE may not be able to detect it. In this way, the size of the first HARQ information determined by the UE is likely to be wrong.
  • DCI 0 specifically includes 4 DCIs, and the indexes are 1 to 4 in sequence.
  • the first HARQ information determined by the UE is specifically (AN, AN, AN, AN), where AN represents ACK or NACK.
  • the UE can fill in the HARQ corresponding to the missed DCI with NACK, and the first HARQ information determined by the UE can be (AN, AN, N, AN), N means NACK.
  • the first HARQ information determined by the UE is (AN, AN, AN). If the UE sends the first HARQ information to the base station according to the load size of the above-mentioned wrong first HARQ information. The understanding of the load size of the first HARQ information by the base station and the UE is inconsistent.
  • the base station thinks that the size of the first HARQ information should be 4 bits, and the payload size of the first HARQ information sent by the UE is 3 bits. Then it may cause interference to other transmitted UCI, such as the second HARQ information.
  • the DCI is used to indicate the load size of the first HARQ information, which can make the understanding of the size of the first HARQ information consistent between the base station and the UE, and avoid affecting the transmission of the second HARQ information.
  • the UE may compare the payload size of the first HARQ information indicated by the DCI with the payload size of the HARQ information determined by the UE according to the aforementioned DCI. If the two are consistent, it is considered that the UE does not miss detection of DCI. The UE directly transmits the previously canceled HARQ information, that is, the first HARQ information, to the base station. If the two are inconsistent, it is considered that the UE missed DCI before, and the HARQ information corresponding to the missed DCI can be supplemented according to the load size of the first HARQ information indicated by the DCI.
  • the load size of the first HARQ information indicated by the DCI is 4, then the UE can fill in 1-bit NACK in the first HARQ information of the above-mentioned determined 3 load sizes, and the first HARQ information after filling can be (AN, AN , AN, N).
  • the scheme of indicating the payload size of the first HARQ information in the above-mentioned first DCI and the above-mentioned scheme of concatenating the encoded bit sequence of the first HARQ information after the encoded bit sequence of the second HARQ information can be considered as Two parallel programs.
  • the two schemes can prevent the retransmitted first HARQ information from causing interference to the normally transmitted second HARQ information.
  • the above two solutions may be used independently or in combination, without limitation.
  • a DAI may be set in the DCI, and the value of the DAI may be used to indicate the payload size of the first HARQ information.
  • the DAI field may occupy 2 bits, or other more bits, etc., which are not limited.
  • the DCI may include a C-DAI, and the C-DAI may indicate the C-DAI of the DCI corresponding to the second HARQ information.
  • the DCI may further include a T-DAI, where the T-DAI is used to indicate that the second HARQ information corresponds to the T-DAI of the DCI.
  • a DAI value may be additionally set in the DCI, and the DAI value may indicate the payload size of the retransmitted first HARQ information.
  • the base station may calculate the remainder of X modulo 4 according to the load size X of the first HARQ information, and the values of the remainder are 1, 2, 3 and 0 respectively corresponding to 00, 01, 10 and 11 of the 2-bit DAI .
  • the correct payload size of the first HARQ message is 2.
  • the base station sends a group of DCIs to the UE, and the group of DCIs includes 5 DCIs. Instructing the UE to retransmit the load size of the first HARQ information for the first DCI and the third DCI in the group of DCIs. Then, the first DCI and the third DCI may include an additional DAI field, and the value of the DAI is 01. For other DCIs in the set of DCIs, this extra DAI field may not be included.
  • the UE is instructed to retransmit the first HARQ information for the third DCI in the group of DCIs, then the third DCI in the group of DCIs includes the above-mentioned additional DAI field, and the value of the DAI is 01. Other DCIs in this set of DCIs do not include the above-mentioned DAI field.
  • type 1 HARQ-ACK codebook For the canceled HARQ codebook type is type 1, if the base station schedules 2 PDSCHs through 2 DCIs, corresponding to 2-bit HARQ feedback, UE will feed back a complete set of type 1 HARQ codebooks ; However, if the UE misses a DCI, the UE will only consider it as a 1-bit HARQ feedback, which will cause the HARQ codebook size to be ambiguous when the UE misses a DCI. If the initial transmission codebook and the retransmission codebook are cascaded together for transmission, the size of the retransmission codebook will be ambiguous, which will affect the performance of the initial transmission codebook.
  • the first DCI does not schedule data, and uses a 1-bit field to indicate the payload size of the first HARQ information. Specifically, a value of 0 in this 1-bit field indicates that the size of the first HARQ information is 1 bit. 1 indicates that the first HARQ information is a complete type 1 HARQ codebook. The complete type 1 HARQ codebook is determined according to the K1 set.
  • the base station and the terminal include hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software with reference to the units and method steps of the examples described in the embodiments disclosed in the present application. Whether a certain function is executed by hardware or computer software drives the hardware depends on the specific application scenario and design constraints of the technical solution.
  • FIG. 10 and FIG. 11 are schematic structural diagrams of possible communication devices provided by the embodiments of the present application. These communication devices can be used to implement the functions of the terminal or the base station in the above method embodiments, and therefore can also realize the beneficial effects of the above method embodiments.
  • the communication device may be one of the terminals 120a-120j shown in FIG. 1, or the base station 110a or 110b shown in FIG. 1, or a terminal or a base station Modules (such as chips).
  • a communication device 1000 includes a processing unit 1010 and a transceiver unit 1020 .
  • the communication device 1000 is configured to implement the functions of a terminal or a base station in the method embodiment shown in FIG. 5 above.
  • the transceiver unit 1020 is used to receive a set of DCIs from the network equipment, and the first DCI in the set of DCIs also indicates that the terminal The device retransmits first HARQ information; the processing unit 1010 is configured to determine the first HARQ information; the transceiver unit 1020 is configured to send the first HARQ information to the network device.
  • the transceiver unit 1020 is used to send a set of DCIs to the terminal equipment, and the first DCI in the set of DCIs also indicates that the terminal equipment retransmitting first HARQ information, and receiving the first HARQ information from the terminal device.
  • the processing unit 1010 is configured to process the first HARQ information.
  • processing unit 1010 and the transceiver unit 1020 can be directly obtained by referring to related descriptions in the method embodiment shown in FIG. 5 , and details are not repeated here.
  • a communication device 1100 includes a processor 1110 and an interface circuit 1120 .
  • the processor 1110 and the interface circuit 1120 are coupled to each other.
  • the interface circuit 1120 may be a transceiver or an input-output interface.
  • the communication device 1100 may further include a memory 1130 for storing instructions executed by the processor 1110 or storing input data required by the processor 1110 to execute the instructions or storing data generated by the processor 1110 after executing the instructions.
  • the processor 1110 is used to implement the functions of the above-mentioned processing unit 1010
  • the interface circuit 1120 is used to implement the functions of the above-mentioned transceiver unit 1020 .
  • the terminal chip implements the functions of the terminal in the above method embodiment.
  • the terminal chip receives information from other modules in the terminal (such as radio frequency modules or antennas), and the information is sent to the terminal by the base station; or, the terminal chip sends information to other modules in the terminal (such as radio frequency modules or antennas), and the The information is sent by the terminal to the base station.
  • the base station module implements the functions of the base station in the above method embodiment.
  • the base station module receives information from other modules in the base station (such as radio frequency modules or antennas), and the information is sent to the base station by the terminal; or, the base station module sends information to other modules in the base station (such as radio frequency modules or antennas), the The information is sent by the base station to the terminal.
  • the base station module here may be a baseband chip of the base station, or a DU or other modules, and the DU here may be a DU under an open radio access network (O-RAN) architecture.
  • OF-RAN open radio access network
  • processor in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • CPU central processing unit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor can be a microprocessor, or any conventional processor.
  • the method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions.
  • Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only Memory, registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium.
  • the storage medium may also be a component of the processor.
  • the processor and storage medium can be located in the ASIC.
  • the ASIC can be located in the base station or the terminal.
  • the processor and the storage medium may also exist in the base station or the terminal as discrete components.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable devices.
  • the computer program or instructions can be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions can be downloaded from a website, computer, A server or data center transmits to another website site, computer, server or data center by wired or wireless means.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrating one or more available media.
  • the available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; or it may be a semiconductor medium, such as a solid-state hard disk.
  • the computer readable storage medium may be a volatile or a nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.
  • At least one refers to one or more, and “multiple” refers to two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the contextual objects are an “or” relationship; in the formulas of this application, the character “/” indicates that the contextual objects are a “division” Relationship.
  • “Including at least one of A, B and C” may mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de retransmission d'informations de retour. Le procédé comprend les étapes suivantes : un terminal reçoit un groupe de DCI à partir d'une station de base, des premières DCI dans le groupe de DCI étant utilisées pour ordonner au terminal de retransmettre des premières informations HARQ ; et le terminal émet les premières informations HARQ à la station de base. L'utilisation du procédé permet d'obtenir une retransmission d'informations HARQ supprimées.
PCT/CN2022/103987 2021-08-06 2022-07-05 Procédé et appareil de retransmission d'informations de retour WO2023011090A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN202110904374.6 2021-08-06
CN202110904374 2021-08-06
CN202111306570.XA CN115707122A (zh) 2021-08-06 2021-11-05 一种重传反馈信息的方法及装置
CN202111306570.X 2021-11-05

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WO2023011090A1 true WO2023011090A1 (fr) 2023-02-09

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108633016A (zh) * 2017-03-23 2018-10-09 华为技术有限公司 一种下行控制信息的收发方法及装置
CN109391372A (zh) * 2017-08-11 2019-02-26 华为技术有限公司 通信方法与设备
US20200136786A1 (en) * 2017-06-24 2020-04-30 Huawei Technologies Co., Ltd. Data transmission method, data transmission feedback method, and related apparatus
CN111316587A (zh) * 2018-03-28 2020-06-19 华为技术有限公司 一种混合自动重传请求方法、网络设备及终端
CN111435899A (zh) * 2019-02-15 2020-07-21 维沃移动通信有限公司 混合自动重传请求harq反馈方法、终端及网络设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108633016A (zh) * 2017-03-23 2018-10-09 华为技术有限公司 一种下行控制信息的收发方法及装置
US20200136786A1 (en) * 2017-06-24 2020-04-30 Huawei Technologies Co., Ltd. Data transmission method, data transmission feedback method, and related apparatus
CN109391372A (zh) * 2017-08-11 2019-02-26 华为技术有限公司 通信方法与设备
CN111316587A (zh) * 2018-03-28 2020-06-19 华为技术有限公司 一种混合自动重传请求方法、网络设备及终端
CN111435899A (zh) * 2019-02-15 2020-07-21 维沃移动通信有限公司 混合自动重传请求harq反馈方法、终端及网络设备

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