WO2022151435A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2022151435A1
WO2022151435A1 PCT/CN2021/072320 CN2021072320W WO2022151435A1 WO 2022151435 A1 WO2022151435 A1 WO 2022151435A1 CN 2021072320 W CN2021072320 W CN 2021072320W WO 2022151435 A1 WO2022151435 A1 WO 2022151435A1
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Prior art keywords
dci
pdsch
detection
end symbol
parameter
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PCT/CN2021/072320
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English (en)
Chinese (zh)
Inventor
刘显达
纪刘榴
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华为技术有限公司
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Priority to PCT/CN2021/072320 priority Critical patent/WO2022151435A1/fr
Publication of WO2022151435A1 publication Critical patent/WO2022151435A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the embodiments of the present application relate to the field of wireless communication, and in particular, to a communication method and apparatus.
  • the data transmission of ultra-reliable low-latency communications (URLLC) services has the characteristics of low-latency and high reliability.
  • the premise of ensuring low-latency and high-reliability data transmission is that user equipment (UE) can correctly receive downlink control information (DCI).
  • DCI downlink control information
  • the repeated transmission mechanism of the physical downlink control channel (PDCCH) can improve the received signal-to-noise ratio of the PDCCH, thereby improving the probability of correctly receiving the DCI.
  • the PDCCH repeated transmission mechanism means that the same DCI performs multiple repeated transmissions in the time domain.
  • the UE will send a hybrid automatic repeat request ACK (hybrid automatic repeat request ACK). , HARQ-ACK) message, wherein, if the PDSCH is received correctly, the UE sends a positive acknowledgement (Acknowledgement, ACK), otherwise the UE sends a negative acknowledgement (Negative Acknowledgement, NACK).
  • ACK hybrid automatic repeat request ACK
  • a certain time interval needs to be reserved between the time when the HARQ-ACK message is fed back and the end time of the PDSCH transmission, so that the UE performs the PDSCH reception processing and generates the HARQ-ACK message and performs the upload processing.
  • the delay is sufficient, Thus, the accuracy of PDSCH reception and HARQ-ACK message is guaranteed.
  • Embodiments of the present application provide a communication method and apparatus, which are used to determine a reasonable HARQ-ACK message feedback time to adapt to the processing capability of the UE.
  • an embodiment of the present application provides a communication method, the method includes: a communication device detects a first DCI and a second DCI, the first DCI and the second DCI schedule the same PDSCH, and the second DCI The end symbol of the first DCI is later than the end symbol of the first DCI, the communication device sends the first HARQ-ACK message corresponding to the PDSCH, and the earliest feedback time of the first HARQ-ACK message is based on the PDSCH and the The time domain position relationship of the second DCI is determined.
  • a reasonable HARQ-ACK message feedback time can be determined in the scenario of repeated PDCCH transmission to adapt to the processing capability of the terminal device.
  • the terminal device first determines the time domain positional relationship between the PDSCH and the second DCI, and then further determines the value of d 1,1 . Therefore, using the technical solutions provided by the embodiments of the present application can not only ensure the scheduling flexibility of the network equipment, that is, the time domain position of the PDSCH is flexible, and there are various possibilities of overlapping with the DCI, but also can ensure the HARQ-ACK message. Feedback quality.
  • the first parameter is determined according to the number of symbols occupied by the PDSCH, and the first parameter is used for Determine the earliest time for feedback of the first HARQ-ACK message.
  • the above design can ensure that the terminal equipment performs PDSCH reception processing and generates a HARQ-ACK message and performs upload processing with sufficient delay, thereby ensuring the accuracy of PDSCH reception and HARQ-ACK message.
  • the first parameter is Determined according to the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH, the first parameter is used to determine the earliest time for feedback of the first HARQ-ACK message.
  • the above design can ensure that the terminal equipment performs PDSCH reception processing and generates a HARQ-ACK message with sufficient delay for upload processing, thereby ensuring the accuracy of PDSCH reception and HARQ-ACK message.
  • the first parameter is positively related to the number of symbols occupied by the PDSCH.
  • the positive correlation between the first parameter and the number of symbols occupied by PDSCH means that when the number of symbols occupied by PUSCH is x1, the corresponding first parameter is y1 and the number of symbols occupied by PUSCH is x2. The value is y2, assuming x1 ⁇ x2, then y1 ⁇ y2.
  • the first parameter can be determined according to the number of symbols occupied by the PDSCH.
  • the first parameter is a first preset value
  • the first parameter is a second preset value, wherein the first preset value is greater than the second preset value.
  • the first parameter can be easily determined in combination with the number of symbols occupied by the PDSCH, which is easy to implement.
  • the first parameter is inversely correlated with the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH; and/or, the first parameter and the The number of symbols from the start symbol of the PDSCH to the end symbol of the second DCI is positively correlated.
  • the first parameter can be determined according to the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH and/or the number of symbols from the start symbol of the PDSCH to the end symbol of the second DCI.
  • the first parameter is a third preset value, and if the The number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH is less than or equal to the second threshold, and the first parameter is a fourth preset value, wherein the third preset value is smaller than the a fourth preset value; and/or, if the number of symbols from the start symbol of the PDSCH to the end symbol of the second DCI is greater than a third threshold, the first parameter is a fifth preset value, If the number of symbols from the start symbol of the PDSCH to the end symbol of the second DCI is less than a third threshold, the first parameter is a sixth preset value, where the fifth preset value is greater than the sixth preset value.
  • the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH and/or the number of symbols from the start symbol of the PDSCH to the end symbol of the second DCI can be easily determined. parameters, easy to implement.
  • the PDSCH corresponds to multiple PUCCHs, the time domain starting positions of the multiple PUCCHs are different, and at least one PUCCH in the multiple PUCCHs is used to carry the first HARQ-ACK message , at least one PUCCH in the plurality of PUCCHs is used to carry a second HARQ-ACK message; the second HARQ-ACK message and the first HARQ-ACK message both correspond to the PDSCH; the second HARQ-ACK message The end time of the ACK message feedback is earlier than the earliest time of the first HARQ-ACK message feedback.
  • the PDSCH corresponds to multiple PUCCHs means that all of the multiple PUCCHs can be used to carry feedback information on whether the PDSCH is correctly received.
  • the terminal device when the terminal device successfully parses the first DCI, the terminal device can send a second HARQ-ACK message to quickly feedback the HARQ-ACK and reduce the transmission delay. At the same time, the terminal device may also send the first HARQ-ACK message.
  • an embodiment of the present application provides a communication method, the method comprising: a communication device determining first capability indication information, where the first capability indication information is used to indicate a DCI detection hypothesis supported by the communication device, the DCI The detection hypothesis is used to indicate the DCI detection complexity corresponding to the two PDCCH candidates associated with each other.
  • the communication device sends first capability indication information.
  • the terminal device can report the appropriate decoding method for the interrelated PDCCH candidates according to its own capabilities, and informing the network device of the DCI detection assumptions supported by the terminal device can enable the network device to reasonably allocate DCI detection resources and flexibly schedule DCI.
  • the DCI detection hypothesis includes at least one of a first detection hypothesis, a second detection hypothesis and a third detection hypothesis; wherein, the first detection hypothesis corresponds to the first DCI blind detection number, so The second detection hypothesis corresponds to the second DCI blind detection number, the third detection hypothesis corresponds to the third DCI blind detection number, the first DCI blind detection number, the second DCI blind detection number and the third DCI blind detection number
  • the number of blind detections varies from one to another.
  • the terminal device can report a DCI detection hypothesis according to its own capability, so that the network device reasonably allocates the DCI detection resources and flexibly schedules the DCI.
  • the number of the first DCI blind detection is X
  • the second DCI blind detection number is X+1
  • the third DCI blind detection number is X+2, X ⁇ 1, X is a positive integer.
  • the communication device when the first capability indication information indicates that the communication device supports the third detection hypothesis, the communication device also supports the first detection hypothesis, and/or the second detection hypothesis .
  • the communication device when the first capability indication information indicates that the communication device supports the second detection hypothesis, the communication device also supports the first detection hypothesis.
  • the network device can determine a unified detection hypothesis according to the first capability indication information reported by each terminal device it serves, so as to reduce the complexity of its own implementation.
  • the method further includes: the communication apparatus determines second capability indication information, where the second capability indication information is used to indicate the maximum time interval of two PDCCH candidates that are related to each other; the communication apparatus sends the the second capability indication information.
  • the method further includes: the communication apparatus determines third capability indication information, where the third capability indication information is used to indicate the number of PDCCH candidate pairs that can be supported in the first time unit, the PDCCH candidate pair Two PDCCH candidates in are correlated with each other; wherein, the first time unit is greater than or equal to a detection range, and the detection number of PDCCH candidates that the communication device can support within the detection range is used to characterize the DCI of the communication device detecting capability; the communication apparatus sends the third capability indication information.
  • the third capability indication information is used to indicate the number of PDCCH candidate pairs that can be supported in the first time unit, the PDCCH candidate pair Two PDCCH candidates in are correlated with each other; wherein, the first time unit is greater than or equal to a detection range, and the detection number of PDCCH candidates that the communication device can support within the detection range is used to characterize the DCI of the communication device detecting capability; the communication apparatus sends the third capability indication information.
  • the communication device reports the maximum number of detectable PDCCH candidates within a detection range.
  • the first time unit includes N detection ranges.
  • the number of OFDM symbols between two correlated PDCCH candidates does not exceed the number of OFDM symbols included in the first time unit.
  • the third capability indication information can enable the network device to reasonably configure the correlation of the PDCCH candidates and reduce the detection complexity of the terminal device.
  • the method further includes: the communication device determines the number of PDCCH candidates to be detected in the first detection range according to the number of first PDCCH candidates; wherein the detection range where the first PDCCH candidate is located is located in the Before the first detection range, the detection range in which the second PDCCH candidate is located is the first detection range or after the first detection range, and the first PDCCH candidate is associated with the second PDCCH candidate .
  • the communication device compares the number of PDCCH candidates to be detected within a detection range with the maximum number of PDCCH candidates that it can support for detection, when the number of PDCCH candidates to be detected is not greater than the number of PDCCH candidates that it can support detection
  • the maximum number of PDCCH candidates to be detected in the detection range needs to be detected.
  • the communication device needs to Among the detected PDCCH candidates, some PDCCH candidates are selected for detection according to preset rules.
  • an embodiment of the present application provides a communication method, the method comprising:
  • the network device sends a first DCI and a second DCI, the first DCI and the second DCI schedule the same physical downlink shared channel PDSCH, and the end symbol of the second DCI is later than the end symbol of the first DCI;
  • the network device receives the first HARQ-ACK message corresponding to the PDSCH, and the earliest time of the feedback of the first HARQ-ACK message is based on the time domain position of the PDSCH and the second DCI relationship is established.
  • the first parameter is determined according to the number of symbols occupied by the PDSCH, and the first parameter is used for It is determined that the first HARQ-ACK message is fed back.
  • the first parameter is Determined according to the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH, the first parameter is used to determine the earliest time for feedback of the first HARQ-ACK message.
  • the first parameter is positively related to the number of symbols occupied by the PDSCH.
  • the first parameter is a first preset value
  • the first parameter is a second preset value, wherein the first preset value is greater than the second preset value.
  • the first parameter is inversely correlated with the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH; and/or, the first parameter and the The number of symbols from the start symbol of the PDSCH to the end symbol of the second DCI is positively correlated.
  • the PDSCH corresponds to multiple physical uplink control channels (PUCCHs), at least one PUCCH among the multiple PUCCHs is used to carry the first HARQ-ACK message, and at least one PUCCH among the multiple PUCCHs is used to carry the first HARQ-ACK message.
  • PUCCHs physical uplink control channels
  • One PUCCH is used to carry the second HARQ-ACK message; both the second HARQ-ACK message and the first HARQ-ACK message are used to indicate whether the PDSCH is received correctly; the feedback of the second HARQ-ACK message is The end time is earlier than the earliest time of feedback of the first HARQ-ACK message.
  • an embodiment of the present application provides a communication method, the method comprising:
  • the network device receives first capability indication information, where the first capability indication information is used to indicate a DCI detection hypothesis supported by the communication apparatus, and the DCI detection hypothesis is used to indicate the DCI detection complexity corresponding to the two correlated PDCCH candidates ; the network device sends first configuration information to the communication apparatus according to the first capability indication information, where the first configuration information is used for DCI detection hypotheses corresponding to the two correlated PDCCH candidates.
  • the DCI detection hypothesis includes at least one of a first detection hypothesis, a second detection hypothesis and a third detection hypothesis; wherein, the first detection hypothesis corresponds to the first DCI blind detection number, so The second detection hypothesis corresponds to the second DCI blind detection number, the third detection hypothesis corresponds to the third DCI blind detection number, the first DCI blind detection number, the second DCI blind detection number and the third DCI blind detection number
  • the number of blind detections varies from one to another.
  • the method further includes: receiving, by the network device, second capability indication information, where the second capability indication information is used to indicate a maximum time interval between two PDCCH candidates associated with each other.
  • the method further includes: the network device receives third capability indication information, where the third capability indication information is used to indicate the number of PDCCH candidate pairs that can be supported in the first time unit, each PDCCH candidate pair Two PDCCH candidates in are correlated with each other; wherein, the first time unit is greater than or equal to a detection range, and the detection number of PDCCH candidates that can be supported within the detection range is used to characterize the DCI detection capability of the communication device.
  • an embodiment of the present application provides a communication device, the device includes a module for performing any one of the possible designs of the first aspect and the first aspect, or performing any of the second aspect and the second aspect.
  • a communication apparatus including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory, so as to implement any one of the possible designs of the first aspect above, or to execute any one of the possible designs of the second aspect and the second aspect, or to execute the first Any one of the possible designs of the three aspects and the third aspect, or any one of the possible designs of the implementation of the fourth aspect and the fourth aspect.
  • the communication device further includes a communication interface
  • the processor is coupled to the communication interface, the communication interface is used for inputting and/or outputting information, and the information includes at least one of instructions and data.
  • the communication device further includes a memory.
  • the communication apparatus is a terminal device or a network device.
  • the communication interface may be a transceiver, or an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • the communication apparatus is a chip or a chip system configured in a terminal device or a network device.
  • the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, and the like.
  • the processor may also be embodied as a processing circuit or a logic circuit.
  • an embodiment of the present application provides a communication device, including a processor and an interface circuit, where the interface circuit is used to input and/or output information, the information includes at least one of instructions and data, and through the The interface circuit is capable of receiving signals from other communication devices than the communication device and transmitting to the processor or sending signals from the processor to other communication devices than the communication device, the processor
  • a logic circuit or execution of code instructions is used to implement any one of the possible designs of the first aspect and the first aspect, or any one of the possible designs of the second aspect and the second aspect, or the third aspect and the third aspect Any one possible design of the aspect, or any one possible design of the fourth and fourth aspects.
  • an embodiment of the present application provides a computer-readable storage medium, where a computer program or instruction is stored in the storage medium, and when the computer program or instruction is executed by a communication device, the first aspect and the first aspect are implemented any one of the possible designs of the any of the possible designs.
  • embodiments of the present application provide a computer program product including a program, which, when running on a communication device, enables the communication device to execute any one of the possible designs of the first aspect and the first aspect, or the second Any one possible design of the aspect and the second aspect or any one possible design of the third aspect and the third aspect, or any one possible design of the fourth aspect and the fourth aspect.
  • FIG. 1 is a schematic structural diagram of a mobile communication system to which an embodiment of the present application is applied;
  • FIG. 2 is a schematic diagram of DCI repeated transmission in an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a UE processing module in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of obtaining the value of DCI to determine the value of d 1,1 by joint processing of multiple DCI transmissions in an embodiment of the present application;
  • FIG. 5 is an overview flowchart of a communication method according to an embodiment of the present application.
  • Figure 6 (a) is a schematic diagram of the end symbol of the PDSCH and the end symbol of the second DCI being the same in an embodiment of the present application;
  • FIG. 6(b) is a schematic diagram that the end symbol of PDSCH is earlier than the end symbol of the second DCI in an embodiment of the present application;
  • FIG. 7 is a schematic diagram illustrating that the start symbol of PDSCH is earlier than the end symbol of the second DCI, and the end symbol of the PDSCH is later than the end symbol of the second DCI in an embodiment of the present application;
  • FIG. 8 is a schematic diagram of the start symbol of the PDSCH being later than the end symbol of the second DCI in an embodiment of the present application;
  • FIG. 13 is a second schematic structural diagram of a communication device in an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a mobile communication system to which an embodiment of the present application is applied.
  • the mobile communication system includes a core network device 110 , a radio access network device 120 and at least one terminal device (such as the terminal device 130 and the terminal device 140 in FIG. 1 ).
  • the terminal equipment is connected to the wireless access network equipment in a wireless manner, and the wireless access network equipment is connected with the core network equipment in a wireless or wired manner.
  • the core network device and the radio access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the radio access network device can be integrated on the same physical device, or they can be one physical device. It integrates the functions of some core network equipment and some functions of the wireless access network equipment.
  • Terminal equipment can be fixed or movable.
  • FIG. 1 is just a schematic diagram, and 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 embodiments of the present application do not limit the number of core network devices, wireless access network devices, and terminal devices included in the mobile communication system.
  • the terminal device is wirelessly connected to the wireless access network device, so as to access the mobile communication system.
  • the radio access network equipment can be a base station (base station), an evolved NodeB (eNodeB), a transmission reception point (TRP), and a next generation NodeB (gNB) in the 5G mobile communication system , the base station in the future mobile communication system or the access node in the 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 (CU) or a distributed unit (distributed unit, DU).
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device.
  • wireless access network equipment is referred to as network equipment, and unless otherwise specified, network equipment refers to wireless access network equipment.
  • the network equipment performs downlink signal transmission and uplink signal reception.
  • a terminal device may also be referred to as a terminal, user equipment (UE), a mobile station, a mobile terminal, and the like.
  • the terminal equipment can be mobile phone, tablet computer, computer with wireless transceiver function, virtual reality terminal equipment, augmented reality terminal equipment, wireless terminal in industrial control, wireless terminal in unmanned driving, wireless terminal in remote surgery, smart grid wireless terminals in transportation security, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.
  • the terminal equipment may receive downlink signals or sidelink signals, and/or transmit uplink signals or sidelink signals.
  • Network equipment and terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle; can also be deployed on water; can also be deployed in the air on aircraft, balloons and satellites.
  • the embodiments of the present application do not limit the application scenarios of the network device and the terminal device.
  • the network device and the terminal device can communicate through the licensed spectrum, the unlicensed spectrum, or the licensed spectrum and the unlicensed spectrum at the same time.
  • the network device and the terminal device can communicate through the frequency spectrum below 6 GHz (gigahertz, GHz), and can also communicate through the frequency spectrum above 6 GHz, and can also use the frequency spectrum below 6 GHz and the frequency spectrum above 6 GHz for communication at the same time.
  • the embodiments of the present application do not limit the spectrum resources used between the network device and the terminal device.
  • the embodiments of the present application are applicable to low-frequency scenarios (sub 6G) and also to high-frequency scenarios (above 6G).
  • the embodiments of the present application are applicable to 4G, 5G or future mobile communication systems.
  • PDSCH, PDCCH and physical uplink control channel are only examples of downlink data channel, downlink control channel and uplink data channel.
  • the data channel and the control channel may have different names, which are not limited in the embodiments of the present application.
  • the embodiments of the present application are applicable to both homogeneous network and heterogeneous network scenarios, and also have no restrictions on transmission points, which may be multi-point coordinated transmission between macro base stations and macro base stations, micro base stations and micro base stations, and macro base stations and micro base stations. , applicable to both (frequency division duplex, FDD) systems and time division duplexing (time division duplexing, TDD) systems.
  • the embodiments of the present application are applicable to single-TRP (Single-TRP) or multiple-TRP (Multi-TRP) scenarios, and any of their derived scenarios.
  • the downlink resources of the system are divided into multiple OFDM symbols from the time point of view. In terms of frequency, it is divided into several sub-carriers.
  • the PDCCH in the downlink usually occupies the first two or three OFDM symbols in a subframe. PDCCH is used to carry DCI.
  • the DCI carries terminal device-specific resource allocation and other terminal device-specific or cell-shared control information.
  • the physical uplink shared channel (PUSCH) in the uplink is used to carry the uplink transmission data, usually using discrete Fourier transform spread OFDM (DFT-Spread OFDM, DFT-S-OFDM) to generate the frequency domain Signal.
  • DFT-Spread OFDM discrete Fourier transform spread OFDM
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • one slot usually includes 14 OFDM symbols.
  • the size of a physical resource block (PRB) is also defined in the system. A PRB contains 12 subcarriers in the frequency domain, and a certain subcarrier in
  • the network device will indicate the time domain location of the PDSCH when scheduling the PDSCH.
  • the time domain location indicator field (start&length indicator, SLIV) in the DCI used for downlink scheduling may indicate the following:
  • the time domain offset of the PDSCH relative to the DCI transmission slot may be indicated. For example, if the DCI is sent on slot n, the indicated offset is 0, indicating that the PDSCH is also in slot n. sent on.
  • the terminal device can determine the time domain position of the PDSCH.
  • URLLC transmission is a typical scenario belonging to the 5th generation (5G) mobile communication system.
  • This scenario is characterized by extremely low transmission delay and high transmission reliability.
  • the block error rate of data transmission (block error rate, BLER) can reach 10e- 5 under a specific signal noise ratio (SNR).
  • the network device will configure multiple PDCCH candidates (PDCCH candidates) for a terminal device.
  • PDCCH candidates PDCCH candidates
  • each PDCCH candidate corresponds to a specific control channel element (CCE), and each CCE will occupy specific time-frequency resources. Therefore, one PDCCH candidate can represent the time-frequency resources occupied by DCI delivery.
  • the DCI detection complexity is measured with PDCCH candidates as the basic unit.
  • a PDCCH candidate is only located in one detection range, and does not span multiple detection ranges.
  • a detection range can be predefined or configured.
  • a detection range may be a time slot (slot), or less than a slot, for example, a detection range includes 2, 4, and 7 OFDM symbols.
  • the DCI detection complexity can be defined independently for each serving cell and has a relationship with the subcarrier spacing. For example, as shown in Table 1, a combination (X, Y) is defined when the detection range is defined, where X is The minimum number of OFDM symbols in the interval between two detection ranges, Y is the maximum number of OFDM symbols occupied by PDCCH candidates in one detection range, and ⁇ is the corresponding value of the subcarrier interval.
  • Table 1 Maximum number of PDCCH candidates to be detected corresponding to each slot at different subcarrier spacings in a serving cell
  • Table 2 When the detection range is less than 1 slot at different subcarrier intervals in a serving cell, the maximum number of PDCCH candidates to be detected corresponding to different detection range sizes
  • the reason why the DCI detection complexity is defined by the PDCCH candidates is that the PDCCH candidates can represent the granularity of DCI processing (that is, different PDCCH candidates need to consume the DCI detection unit for signal processing respectively).
  • the network device will configure multiple PDCCH candidates for a terminal device, so that the network device can select one of the PDCCH candidates to deliver DCI as needed, and the terminal device performs blind detection on the above multiple PDCCH candidates to determine the PDCCH candidate where the DCI is located. , to obtain DCI.
  • PDCCH repeated transmission also known as DCI repeated transmission
  • Each PDCCH repeated transmission in the PDCCH repeated transmission corresponds to a PDCCH detection opportunity, and the PDCCH repeated transmission may also be referred to as a PDCCH time domain repeated transmission. Further, each PDCCH repeated transmission may correspond to one PDCCH candidate, different PDCCH repeated transmissions may correspond to different PDCCH candidates, or different PDCCH repeated transmissions may correspond to different detection timings of the same PDCCH candidate, in the embodiment of the present application, The former is used as an example to illustrate, and the latter is not excluded.
  • Each repeated transmission of the PDCCH may carry the same coded bits.
  • the same information bits ie DCI
  • the DCI can be modulated by the same encoding to form exactly the same encoded bits, which are carried by different PDCCH candidates, that is, the DCI can be mapped to different time units respectively, and multiple time units can be On different OFDM symbols of the same time slot (slot) or on different slots.
  • There is a DMRS on each PDCCH repeated transmission and the terminal device performs independent channel estimation according to the DMRS at the time domain position of each PDCCH repeated transmission, and performs corresponding signal demodulation according to the corresponding channel estimation result.
  • the terminal device will perform two independent channel estimations according to the two PDCCHs and Two demodulation results (which can be called soft information) are obtained. Further, the terminal device can combine the two pieces of soft information before performing the parsing/decoding operation, thereby equivalently improving the received signal-to-noise ratio and reducing the bit error rate of decoding.
  • the network device needs to inform the terminal device in advance which PDCCH candidates are used for repeated transmission.
  • One design method is to configure the association relationship between PDCCH candidates, and the terminal device will perform joint DCI parsing/decoding according to the associated PDCCH candidates.
  • the terminal device may use one of the following multiple DCI detection assumptions to perform DCI parsing/decoding operations:
  • DCI Detection Assumption 1 The terminal equipment obtains the soft information (that is, two soft information) respectively on two PDCCH repeated transmissions, and then performs the parsing or decoding operation after combining the two soft information, that is, the terminal equipment only targets the combination. After the soft information, a decoding operation is performed. When the decoded bits obtained through the decoding operation pass the cyclic redundancy check (cyclic redundancy check, CRC) check, the terminal device can obtain the DCI.
  • DCI detection hypothesis 1 corresponds to the lowest complexity of DCI detection. Using DCI detection hypothesis 1 can improve the signal-to-noise ratio of the received signal and reduce the bit error rate.
  • the terminal equipment obtains the soft information (that is, two soft information) respectively on two PDCCH repeated transmissions, and performs independent analysis or decoding operations on the two soft information, that is, the terminal equipment performs two decoding operations, wherein, when the decoded bits obtained by any decoding operation pass the CRC check, the DCI can be obtained.
  • This method cannot improve the signal-to-noise ratio of the received signal, but it can improve the robustness of DCI reception, because, assuming that one of the repeated transmissions has experienced deep channel fading and cannot be received correctly, you can rely on the other repeated transmission (two unrelated transmissions). The probability that all channels experience deep channel fading is relatively low).
  • Adopting the DCI detection hypothesis 2 can reduce the bit error rate in a statistical sense, and does not need the terminal equipment to perform a soft combining operation (ie, a soft information combining operation), and the DCI receiving performance is relatively poor.
  • DCI detection hypothesis 3 After the terminal device performs parsing or decoding operations on the soft information corresponding to the first PDCCH repeated transmission in the time domain, the soft information obtained in the first PDCCH repeated transmission and the second PDCCH repeated transmission are The acquired soft information (that is, two pieces of soft information) is combined and processed to perform parsing or decoding operations, that is, the terminal device performs two decoding operations. Under normal circumstances, the probability of passing the CRC check in the second decoding operation is relatively high, and the first decoding operation is only a decoding attempt. Once the decoded bits obtained in the first decoding operation pass the CRC check, compared with The DCI detection hypothesis 1 can save the operation of soft combining.
  • the network device can also choose in real time whether to send DCI on the second PDCCH repeated transmission.
  • the time-frequency resource overhead for sending the DCI is the time-frequency resources occupied by the two PDCCH candidates, which can ensure the performance of DCI reception. If no DCI is issued on the second PDCCH repeated transmission (for example, in consideration of scheduling, the time-frequency resources of the second PDCCH repeated transmission are used to serve other terminal equipment), then the time-frequency resource overhead of the issued DCI is a PDCCH candidate Occupied time-frequency resources, time-frequency resources can be saved, but the performance of DCI reception will be degraded.
  • DCI detection hypothesis 4 The terminal equipment obtains the soft information (that is, two soft information) on two PDCCH repeated transmissions, and performs independent analysis or decoding operations on the two soft information, and then combines the two soft information. Perform parsing or decoding operations, that is, the terminal device performs three decoding operations.
  • This DCI detection hypothesis has the highest reliability among the four DCI detection hypotheses, but also has the highest processing complexity.
  • each PDCCH repeated transmission can be sent by different transmission reception points (transmission reception points, TRPs) respectively, and different TRPs have a certain degree of isolation in space, so that the transmitted signals experience irrelevant channels.
  • TRPs transmission reception points
  • the spatial channel characteristics are usually characterized by the QCL assumption indication information, so that the receiver can use the channel characteristics to complete signal reception and channel estimation.
  • Signals transmitted by different TRPs usually correspond to different QCL assumptions, that is, the transmission of different TRPs. Channels are independent and uncorrelated.
  • the repeated transmission of PDCCH in different time domains corresponds to different QCL assumptions.
  • the QCL assumption indication information is used to indicate that there is a QCL relationship between the target reference signal and the reference reference signal, where the target reference signal is a reference signal for which the terminal device needs to obtain channel characteristics, and the channel characteristics of the reference reference signal are obtained by the terminal device. Measurements are known.
  • the reference reference signal may be a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a synchronization signal broadcast channel block (synchronous signal/PBCH block, SSB) Wait.
  • the terminal device can obtain the channel characteristics of the target reference signal through the reference reference signal, that is, the spatial characteristic parameters of the two reference signals or channels with the QCL relationship are the same.
  • the spatial characteristic parameters include one or more of the following parameters:
  • Incidence angle angle of arrival, AoA
  • main (Dominant) incident angle AoA average incident angle
  • power angular spectrum (PAS) of incident angle angle of departure (angle of departure, AoD)
  • angle of departure angle of departure, AoD
  • main exit angle Average exit angle, power angle spectrum of exit angle
  • terminal transmit beamforming terminal receive beamforming, spatial channel correlation, network equipment transmit beamforming, network equipment receive beamforming, average channel gain, average channel delay (average delay) , delay spread, Doppler spread, Doppler shift, spatial Rx parameters, etc.
  • QCL type B Doppler shift, Doppler spread
  • QCL type C average channel delay, Doppler frequency shift
  • QCL type D Spatial receive parameters.
  • the terminal device can obtain the parameters corresponding to QCL Type D according to CSI-RS 1: space Receive a parameter (ie, receive beam information), and use the parameter to receive a reference signal (target reference signal) carried by the PDCCH.
  • the same DCI is delivered by different TRPs in different time units, that is, the same DCI corresponds to multiple PDCCH candidates, and each PDCCH candidate carries a repetition of the DCI. Multiple repeatedly transmitted DCIs schedule the same PDSCH.
  • Step 1 Obtain DCI through PDCCH demodulation and DCI decoding
  • Step 2 Receive the DMRS on the corresponding physical resource according to the DCI instruction and perform channel estimation (channel estimation, CE);
  • Step 3 Receive data according to the channel estimation result
  • Step 4 Generate ACK or NACK bits according to the data decoding result and transmit them on the PUCCH.
  • the protocol defines the minimum time interval T proc,1 from the end time of the data transmission scheduled by the DCI to the start time of the HARQ-ACK message feedback of the data to ensure that the terminal device has enough time to complete the effective HARQ-ACK message feedback, T proc,1 satisfies:
  • T proc,1 (N 1 +d 1,1 )(2048+144) ⁇ 2 ⁇ ⁇ T C
  • ⁇ ⁇ f 2 ⁇ ⁇ 15[kHz] 0 15 1 30 2 60 3 120 4 240
  • the unit of N 1 +d 1,1 is the number of OFDM symbols, which means: the delay of PDSCH processing and the delay of UL transmission need to be additionally performed after the PDSCH transmission ends.
  • N1 is determined according to the PDSCH processing capability and the subcarrier interval ⁇ , and the standard is called PDSCH demodulation time.
  • N 1 can be as shown in Table 4 and Table 5 below.
  • the value of d 1,1 is related to the number of symbols occupied by the PDSCH and the positional relationship of the PDCCH that schedules the PDSCH. Specifically, when the number of symbols occupied by PDSCH is less than 7, d 1,1 under Cap1 is determined according to the number of symbols occupied by PDSCH and the number of symbols overlapped in the time domain of PDSCH and PDCCH, and d 1,1 under Cap2 is determined according to the number of symbols occupied by PDSCH and PDCCH. The number of symbols that the PDCCH time domain overlaps is determined.
  • the terminal device demodulates the PDSCH one by one OFDM symbol.
  • the terminal device can simultaneously decode the DCI and demodulate the data that has been previously demodulated. Received data on OFDM symbols. Therefore, if the time required for the terminal device to demodulate data on one OFDM symbol is less than the duration of one OFDM symbol and the length of the OFDM symbol occupied by the PDSCH is sufficient, the terminal device can complete the DCI analysis during the PDSCH transmission process. Decoding, and demodulation of the data on most of the OFDM symbols is done.
  • the time for the terminal equipment to receive PDSCH is not enough to support the terminal equipment to complete the parsing and decoding of DCI and perform demodulation of data on most of the OFDM symbols, thus requiring additional processing time d 1,1 , and the value of d 1,1 is related to the time when PDSCH demodulation starts.
  • the terminal device processing module can be divided into: a DCI detection module, a channel estimation (Channel Estimation, CE) module, a demodulation (demodulation) module, and an uplink (uplink, UL) processing module.
  • a DCI detection module a channel estimation (Channel Estimation, CE) module
  • a demodulation (demodulation) module a demodulation (demodulation) module
  • an uplink (uplink, UL) processing module uplink (uplink, UL) processing module.
  • the squares in Figure 3 represent the duration.
  • N 1 is set according to the duration required by the terminal device to process the long PDSCH, and for the short PDSCH, d 1,1 is additionally set.
  • d 1 , 1 in the existing protocol is as follows, where L represents the number of symbols occupied by the PDSCH indicated in the DCI, and d represents the number of symbols that the PDSCH and PDCCH overlap in the time domain.
  • the number of symbols between the HARQ-ACK feedback start time and the PDSCH end time is greater than or equal to N 1 +d 1,1 , and the terminal device can provide a reliable HARQ-ACK message feedback.
  • the terminal equipment feeds back NACK because it is too late to process the PDSCH.
  • the execution body of the embodiment of the present application may be a communication device, and the communication device here may be a terminal device or a device (eg, a chip) in the terminal device.
  • the embodiment of the present application provides a communication method, which is used to determine a reasonable HARQ-ACK message feedback time to adapt to the processing capability of a terminal device.
  • the following takes a terminal device as an example for description. As shown in FIG. 5 , the method includes:
  • Step 500 The network device sends the first DCI and the second DCI, the PDCCH candidates corresponding to the first DCI and the second DCI are correlated with each other, and the end symbol of the second DCI is later than the end symbol of the first DCI.
  • the terminal device detects the first DCI and the second DCI.
  • the PDCCH candidate 1 corresponding to the first DCI and the PDCCH candidate 2 corresponding to the second DCI are two mutually correlated PDCCH candidates.
  • the existence of an association relationship between the two PDCCH candidates specifically means that the DCI obtained from the two PDCCH candidates has a relationship, or the DCI needs to be jointly obtained according to the two PDCCH candidates.
  • the DCI relationship obtained on the two PDCCH candidates specifically means that the DCI received on the two PDCCH candidates may be the DCI that schedules the same PDSCH, or the DCI received on the two PDCCH candidates is exactly the same.
  • the scheduling information of the PDSCH needs to be determined according to one of the DCIs. This definition can correspond to DCI detection hypothesis 2.
  • the need to jointly acquire DCI based on two PDCCH candidates specifically refers to when the DCI received on the two PDCCH candidates are exactly the same and are used to schedule the same PDSCH.
  • the soft information obtains the parsed DCI through the merging process. Exemplarily, this definition corresponds to DCI detection hypothesis 1, DCI detection hypothesis 3, and DCI detection hypothesis 4.
  • the embodiment of the present application is also applicable to a scenario of three or more PDCCH candidates, wherein there is an association relationship among the three or more PDCCH candidates.
  • the association relationship may be pre-configured by the network device.
  • the network device is configured with multiple search space sets (search space sets, SSSs), and each SSS is configured with at least one PDCCH candidate and a DCI detection period and offset.
  • search space sets search space sets
  • SSSs search space sets
  • PDCCH candidate 1 and PDCCH candidate 2 are configured to be correlated with each other, and the PDCCH candidates with the same ID under the same aggregation level (Aggregation Level, AL) value in the predefined correlated SSSs are correlated with each other.
  • AL aggregatation Level
  • the terminal device can uniquely determine the PDCCH candidates that have an associated relationship.
  • Step 510 The terminal device sends the first HARQ-ACK message corresponding to the PDSCH, and the earliest time of feedback of the first HARQ-ACK message is determined according to the time domain position relationship between the PDSCH and the second DCI. Wherein, both the first DCI and the second DCI are used to schedule the PDSCH.
  • the time domain symbols occupied by the first DCI and the second DCI are regarded as a whole, and at this time, the earliest moment of feedback of the first HARQ-ACK message is based on the time domain positions of the PDSCH and the first DCI and the second DCI. relationship is established.
  • the time domain position relationship between the PDSCH and the second DCI includes the following possible scenarios:
  • Scenario 1 The PDSCH and the time domain of the second DCI overlap.
  • the overlapping part in the time domain of the PDSCH and the second DCI refers to a symbol occupied by the PDSCH and the symbol occupied by the second DCI that overlap in the time domain.
  • the embodiment of the present application divides the case 1 into a scenario 1A and a scenario 1B.
  • the scenario 1A means that the end symbol of the PDSCH is not later than the end symbol of the second DCI.
  • the ending symbol of PDSCH is not later than the ending symbol of the second DCI means that the ending symbol of PDSCH is the same as the ending symbol of the second DCI, or the ending symbol of PDSCH is earlier than the ending symbol of the second DCI, as shown in Figure 6(a) and shown in Figure 6(b).
  • CORE#1 and CORE#2 respectively represent the control resource set CORESET used to carry the DCI issued by TRP 1 and the control resources used to carry the DCI issued by TRP 2
  • the set CORESET there is an association relationship between SSS1 and SSS2 respectively associated with the two control resource sets, that is, there is an association relationship between the PDCCH candidates on SSS1 of CORE#1 and the PDCCH candidates on SSS2 of CORE#2.
  • one or more of the two situations earlier than or equal to are included no later than, that is, it can be applied to both situations earlier than and equal to.
  • Scenario 1B means that the start symbol of the PDSCH is earlier than the end symbol of the second DCI, and the end symbol of the PDSCH is later than the end symbol of the second DCI, as shown in FIG. 7 .
  • Scenario 2 The time domain of the PDSCH and the second DCI do not overlap.
  • that the time domains of the PDSCH and the second DCI do not overlap means that the symbols occupied by the PDSCH and the symbols occupied by the second DCI do not have overlapping symbols in the time domain.
  • the start symbol of the PDSCH is later than the end symbol of the second DCI.
  • the terminal device may adopt but not limited to the following method to determine the earliest moment of feedback of the first HARQ-ACK message.
  • the first parameter is used to determine the earliest moment of feedback of the first HARQ-ACK message, and exemplarily, the first parameter may refer to d 1,1 .
  • the terminal device determines that the end symbol of the PDSCH is not later than the end symbol of the second DCI, and the terminal device determines the first parameter according to the number of symbols occupied by the PDSCH.
  • d 1,1 is related to L
  • d 1,1 is determined according to L
  • d 1, 1 is a function of L, where L is the number of symbols occupied by PDSCH.
  • L is the number of time domain symbols occupied by the PDSCH indicated in the DCI that schedules the PDSCH.
  • L is the number of symbols occupied by multiple repeated transmissions of the PDSCH.
  • the first parameter is positively related to the number of symbols occupied by the PDSCH.
  • the first parameter is d 1,1 , d 1,1 ⁇ (proportional to) L, or the value of d 1,1 is positively related to L.
  • a is a positive number
  • L is the number of symbols occupied by the PDSCH.
  • the positive correlation between the first parameter and the number of symbols occupied by PDSCH means that when the number of symbols occupied by PUSCH is x1, the corresponding first parameter is y1 and the number of symbols occupied by PUSCH is x2.
  • the value is y2, assuming x1 ⁇ x2, then y1 ⁇ y2.
  • the value of the first parameter is 3.
  • the first parameter is a first preset value
  • the first parameter A parameter is a second preset value, wherein the first preset value is greater than the second preset value.
  • the preset condition may be a certain association relationship or a function, etc., which is not limited in this embodiment of the present application. Therefore, the terminal device can have enough time to complete the demodulation and decoding of the PDSCH after parsing the DCI, so as to ensure the feedback quality.
  • the first threshold may be 7, the first preset value may be 6, and the second preset value may be 3. It can be understood that, the first threshold, the first preset value, and the second preset value may also be other values, which are not limited in this embodiment of the present application.
  • the difference is that K1 and K2 corresponding to Cap1 are larger than K1 and K2 corresponding to Cap2.
  • the terminal device After the terminal device receives the PDSCH, the terminal device obtains the DCI. Therefore, the terminal device needs to perform the channel estimation operation and the demodulation of PDSCH symbols after acquiring the DCI. Therefore, the more symbols occupied by the PDSCH, the longer the additional delay is required, that is, the time to feed back the HARQ-ACK message is later. .
  • the terminal device determines that the start symbol of PDSCH is earlier than the end symbol of the second DCI, and the end symbol of PDSCH is later than the end symbol of the second DCI, and the terminal device starts from the end symbol of the second DCI to the end symbol of PDSCH according to the end symbol of the second DCI
  • the first parameter is inversely correlated with the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH; and/or, the first parameter and the start symbol of the PDSCH to the end of the second DCI
  • the number of symbols between symbols is positively correlated.
  • the first parameter is d 1,1 , d 1,1 ⁇ 1/Z, or the value of d 1,1 is inversely correlated with Z, or, d 1,1 ⁇ (LZ), or d 1,
  • the value of 1 is positively correlated with LZ.
  • the above solutions are applicable, wherein the b corresponding to Cap1 is greater than the b corresponding to Cap2.
  • the first parameter is a third preset value.
  • the number of symbols between the end symbols is less than or equal to the second threshold, the first parameter is a fourth preset value, and the third preset value is less than the fourth preset value;
  • the first parameter is the fifth preset value
  • the start symbol of the PDSCH to the end symbol of the second DCI The number of symbols between the end symbols is less than the third threshold
  • the first parameter is a sixth preset value, wherein the fifth preset value is greater than the sixth preset value.
  • Z is the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH.
  • Z is the number of symbols from the end symbol of the second DCI to the end symbol of the PDSCH.
  • the terminal device determines that the start symbol of the PDSCH is earlier than the end symbol of the second DCI, and the end symbol of the PDSCH is later than the end symbol of the second DCI.
  • Y is larger, the additional processing time required by the terminal device is longer, but when Z is larger, the additional processing time required by the terminal device is shorter.
  • the influence of the two parameters is comprehensively considered, and a reasonable feedback delay is determined to ensure the feedback quality.
  • the value of d 1,1 is inversely correlated with ZY.
  • ZY is less than (or less than or equal to) the first threshold
  • the value of d 1,1 is x 1
  • ZY is greater than or equal to (or greater than) the first threshold
  • the value of d 1,1 is 0, where x 1 >0
  • Y+a>Z (or Y ⁇ Z) a is a positive number
  • the value of d 1,1 is positively correlated with YZ.
  • the value of d 1,1 when YZ is less than (or less than or equal to) the second threshold, the value of d 1,1 is x 2 ; when YZ is greater than or equal to (or greater than) the second threshold, the value of d 1,1 is x 3 , where x 3 >x 2 .
  • the value of d 1,1 is 0, and a is a positive number; when Y+a>Z (or Y+a ⁇ Z), d
  • the value of 1,1 is positively correlated with Y–Za.
  • Y-Za is less than the third threshold, the value of d 1,1 is x 4 , and when Y-Za is greater than the third threshold, the value of d 1,1 is x 5 , where x 5 >x 4 ; or , when Y+a>Z (or Y+a ⁇ Z), the value of d 1,1 is positively correlated with Y.
  • the value of d 1,1 is x 6
  • when Y is greater than the fourth threshold the value of d 1,1 is x 7 , where x 7 >x 6 .
  • the terminal device can perform channel estimation operations and demodulation of some PDSCH symbols within the symbols occupied by the PDSCH. After parsing the DCI, the more symbols the PDSCH occupies, the additional The required delay is shorter, that is, the HARQ-ACK message can be fed back earlier.
  • Using the technical solutions provided by the embodiments of the present application can ensure the scheduling flexibility of the network equipment, that is, the time domain position of the PDSCH is flexible, and there are various possibilities of overlapping with the DCI, and according to the technical solutions provided by the embodiments of the present application scheme to ensure the quality of feedback.
  • the start symbol of the PDSCH is restricted to be no earlier than K symbols before the end symbol of the second DCI.
  • K may take 3.
  • the terminal device first determines the time domain position relationship between PDSCH and the second DCI, or, the time domain position relationship between PDSCH and the first DCI and the second DCI. For different time domain position relationships, d 1 , 1 is taken as The value is determined in different ways. After the time domain position relationship is determined, the value of d 1,1 is further determined according to the number of OFDM symbols occupied by the PDSCH.
  • the embodiment of the present application further provides a method for feeding back a HARQ-ACK message.
  • a parsing operation will be performed each time the repeated DCI is demodulated, that is, parsing will be attempted when the DCI is repeatedly transmitted and received for the first time. If the parsing fails ( Failed to pass the CRC check), the second repeated transmission of DCI will be received and the merge operation will be performed to improve the received signal-to-noise ratio and thus increase the probability of correct parsing of the DCI.
  • the PDSCH corresponds to two PUCCHs, wherein one PUCCH is used to carry the first HARQ-ACK message, the other PUCCH is used to carry the second HARQ-ACK message, the second HARQ-ACK message and the first HARQ-ACK message
  • the messages all correspond to the PDSCH, wherein the end time of feedback of the second HARQ-ACK message is earlier than the earliest time of feedback of the first HARQ-ACK message. Therefore, when the terminal device successfully parses the first DCI, the terminal device can send the second HARQ-ACK message to quickly feedback the HARQ-ACK and reduce the transmission delay. At the same time, the terminal device may also send the first HARQ-ACK message.
  • the PDSCH corresponds to K PUCCHs, at least one PUCCH among the K PUCCHs is used to carry the first HARQ-ACK message, at least one PUCCH among the K PUCCHs is used to carry the second HARQ-ACK message, and the second PUCCH is used to carry the second HARQ-ACK message.
  • Both the HARQ-ACK message and the first HARQ-ACK message are used to indicate whether the PDSCH is correctly received, and the end time of feedback of the second HARQ-ACK message is earlier than the earliest time of feedback of the first HARQ-ACK message.
  • the DCI for scheduling the PDSCH is used to indicate multiple PUCCHs, and the time domain starting positions occupied by the multiple PUCCHs are different, for example, the two PUCCHs are time-division multiplexed.
  • Multiple PUCCHs are used to carry the HARQ-ACK message of the PDSCH. Wherein, the first HARQ-ACK message is fed back on PUCCH1 among the multiple PUCCHs, and the second HARQ-ACK message is fed back on PUCCH2 among the multiple PUCCHs.
  • the time domain starting position of PUCCH1 satisfies the first time delay
  • the time domain starting position of PUCCH2 satisfies the second time delay
  • the first time delay is based on one or more PDCCHs whose time domain positions are at the front of the PDCCH repeated transmission.
  • the positional relationship between the transmission and the PDSCH is determined
  • the second delay is determined according to the positional relationship between the last PDCCH transmission and the PDSCH in the PDCCH repeated transmission.
  • the network device may configure multiple resources for feeding back HARQ-ACK messages, that is, multiple PUCCHs, for the terminal device, but the terminal device may only send HARQ-ACK messages on one or more PUCCHs in the above-mentioned PUCCHs . These HARQ-ACK messages all indicate whether the same PUSCH is received correctly.
  • the following method 3 is described as an example of a method for a terminal device to acquire DCI, wherein the starting position of the first PUCCH repeated transmission (that is, the earliest time when the terminal device feeds back the second HARQ-ACK message) can be determined by using an existing protocol method.
  • the starting position of the second PUCCH repeated transmission ie, the earliest moment at which the terminal device feeds back the second HARQ-ACK message
  • the terminal device can determine the time domain starting position of PUCCH 1 according to the time domain position relationship between DCI1 and PDSCH, and feed back the HARQ-ACK message on PUCCH 1 and PUCCH 2. PUCCH 1 Earlier than PUCCH 2. If the terminal device does not receive DCI 1 correctly, the terminal device can determine the starting position of the second PUCCH repeated transmission according to the time domain position relationship between DCI1 and PDSCH, and feed back the HARQ-ACK message on PUCCH 2.
  • the network device needs to configure PUCCH 1 and PUCCH 2 in advance, and inform the terminal device that PUCCH 1 and PUCCH 2 are related to each other and are both used for repeated transmission of DCI, that is, each PUCCH resource carries the same UCI.
  • the embodiment of the present application provides a communication method, and the method includes:
  • the terminal device determines first capability indication information, where the first capability indication information is used to indicate the DCI detection hypothesis supported by the terminal device, and the DCI detection hypothesis is used to indicate the DCI detection complexity corresponding to the two mutually correlated PDCCH candidates.
  • the terminal device sends the first capability indication information.
  • the DCI detection hypothesis is used to indicate the number of PDCCH candidates to be detected corresponding to two PDCCH candidates associated with each other.
  • the existence of an association relationship between the two PDCCH candidates specifically means that the DCI obtained from the two PDCCH candidates has a relationship, or the DCI needs to be jointly obtained according to the two PDCCH candidates.
  • the DCI existence relationship obtained on the two PDCCH candidates specifically means that the DCI received on the two PDCCH candidates may be the DCI that schedules the same PDSCH/uplink physical shared channel (PUSCH), or, on two PDCCH candidates.
  • the DCIs received on the PDCCH candidates are exactly the same, and it can be understood that the DCIs on the two PDCCH candidates are repeated transmissions.
  • the embodiments of the present application do not exclude that the DCIs received on the two PDCCH candidates are different DCIs, or that different PDSCH/PUSCH are scheduled, and the terminal device can independently receive PDSCH/PUSCH according to the parsed DCI;
  • This definition can correspond to DCI detection hypothesis 2.
  • the terminal device needs to try to parse the two DCIs respectively, and determine whether the two DCIs are DCIs that are repeatedly transmitted based on the parsing results.
  • the need to jointly acquire DCI based on two PDCCH candidates specifically refers to when the DCI received on the two PDCCH candidates is exactly the same and is used to schedule the same PDSCH/PUSCH, at this time, the terminal device can acquire based on the two associated PDCCH candidates.
  • the parsed DCI is obtained by combining the soft information of .
  • This definition corresponds to DCI detection hypothesis 1, DCI detection hypothesis 3, and DCI detection hypothesis 4.
  • the embodiments of the present application do not exclude that the DCI received on the two PDCCH candidates are different DCIs, or different PDSCH/PUSCH are scheduled, and the terminal device can analyze the DCI according to the DCI.
  • PDSCH/PUSCH are received independently.
  • the terminal device needs to try to parse the two DCIs respectively, and determine whether the two DCIs are DCIs that are repeatedly transmitted based on the parsing results.
  • each DCI detection hypothesis consumes the processing capability of the terminal device to detect DCI to varying degrees.
  • the DCI detection hypothesis supported by the terminal device needs to be informed to the network device, so that the network device can reasonably allocate DCI detection resources to achieve the effect of flexibly scheduling DCI.
  • the number of PDCCH candidates to be detected (or, may also be referred to as: the number of blind DCI detections) is used to characterize the DCI processing capability of the terminal device, or used to characterize the DCI detection complexity.
  • the terminal device detects a PDCCH candidate, it will consume one DCI detection unit, that is, the PDCCH candidates to be detected and the DCI detection units are in one-to-one correspondence. Since the terminal equipment has a limited number of DCI detection units, the terminal equipment can only detect a certain number of PDCCH candidates in one time unit, so the DCI detection complexity can be represented by the number of PDCCH candidates to be detected.
  • the number of PDCCH candidates to be detected needs to meet the processing capability of the terminal device. If the number of PDCCH candidates to be detected is less than or equal to the number of PDCCH candidates to be detected that the terminal device can support, the terminal device The device can complete the detection of all PDCCH candidates to be detected, otherwise, the terminal device can only complete the detection of part of the PDCCH candidates to be detected.
  • the DCI detection complexity is represented by the number of PDCCH candidates to be detected.
  • the DCI detection hypothesis includes at least one of a first detection hypothesis, a second detection hypothesis, and a third detection hypothesis.
  • the first detection hypothesis is DCI detection hypothesis 1
  • the second detection hypothesis is DCI detection hypothesis 3
  • the third detection hypothesis is DCI detection hypothesis 4.
  • the first capability indication information directly indicates that the detection hypothesis adopted by the two correlated PDCCH candidates is one or more of DCI detection hypothesis 1, or DCI detection hypothesis 3, or DCI detection hypothesis 4.
  • the first capability indication information indicates the number of to-be-detected PDCCH candidates corresponding to two PDCCH candidates associated with each other.
  • the number of PDCCH candidates to be detected that may be indicated by the first capability indication information is X, X+1 or X+2.
  • X may correspond to DCI detection hypothesis 1
  • X+1 may correspond to DCI detection hypothesis 3
  • X+2 may correspond to DCI detection hypothesis 4.
  • the terminal device can report the appropriate decoding method for the interrelated PDCCH candidates according to its own capabilities, and informing the network device of the DCI detection assumptions supported by the terminal device can enable the network device to reasonably allocate DCI detection resources and flexibly schedule DCI .
  • the network device configures, according to the first capability indication information, DCI detection hypotheses corresponding to two PDCCH candidates that are associated with each other.
  • the communication device when the first capability indication information indicates that the communication device supports the third detection hypothesis, the communication device also supports the first detection hypothesis, and/or the second detection hypothesis .
  • the third detection hypothesis capability indicated by the first capability indication information covers the first detection hypothesis, the second detection hypothesis, and the third detection hypothesis.
  • the first capability indication information may further indicate that the communication apparatus supports a fourth detection hypothesis, and the fourth detection hypothesis is DCI detection hypothesis 4.
  • the communication apparatus when the first capability indication information indicates that the communication apparatus supports the third detection hypothesis, the communication apparatus further supports the fourth detection hypothesis.
  • the communication device when the first capability indication information indicates that the communication device supports the second detection hypothesis, the communication device also supports the first detection hypothesis.
  • the second detection hypothesis capability indicated by the first capability indication information covers the first detection hypothesis and the second detection hypothesis.
  • the communication apparatus when the first capability indication information indicates that the communication apparatus supports the second detection hypothesis, the communication apparatus further supports the first detection hypothesis.
  • the communication apparatus when the first capability indication information indicates that the communication apparatus supports the first detection hypothesis, the communication apparatus further supports the fourth detection hypothesis.
  • the network device can determine, according to the first capability indication information reported by each terminal device it serves, that the terminal device it serves adopts a unified detection hypothesis, so as to reduce the complexity of its own implementation.
  • the terminal device may further determine second capability indication information, where the second capability indication information is used to indicate the maximum time interval between two PDCCH candidates associated with each other; the terminal device sends the second capability indication information.
  • the time-domain location where each PDCCH candidate is located is determined by the time-domain location configuration information of the search space set where it is located.
  • the time-domain location configuration information includes slot period, slot offset and a slot
  • the OFDM symbol position of , the time domain position of the PDCCH candidate can be uniquely determined through the above configuration.
  • the interrelated PDCCH candidates in this embodiment of the present application may be determined by setting a time domain offset, where the time domain offset is used to indicate the time domain position relationship between the two interrelated PDCCH candidates.
  • the correlated PDCCH candidates are located in two adjacent slots, and if the time-domain offset is 7 OFDM symbols, the correlated PDCCH candidates are located in the same slot and the time domain The starting position is separated by 7 OFDM symbols.
  • it is also necessary to set the order of the interrelated PDCCH candidates for example, the order of the smaller index values of the search space set where the PDCCH candidates are located comes first.
  • the terminal equipment and the network equipment agree that the PDCCH candidates in the earlier order and the PDCCH candidates in the later order are mutually related PDCCH candidates, that is, they are used to carry PDCCH repeated transmissions.
  • the correlated PDCCH candidates can be uniquely determined. Specifically, if both the PDCCH candidate 1 and the PDCCH candidate 2 are located on the same OFDM symbol in the slot 1, slot 2, and slot 3, the terminal device is required to determine the PDCCH candidates associated with each other at this time. For example, if the time-domain offset is configured as 0 slot, the two PDCCH candidates in each slot are related to each other. If the time-domain offset is configured as 1 slot and PDCCH candidate 1 comes first, then the PDCCH candidates 1 and 2 in slot 1 PDCCH candidate 2 in slot 2 is correlated with each other, and PDCCH candidate 1 in slot 2 and PDCCH candidate 2 in slot 3 are correlated with each other.
  • the second capability indication information is used to indicate the maximum time interval between the time units where the two correlated PDCCH candidates are located.
  • the maximum time interval of the two correlated PDCCH candidates is specifically: among the two correlated PDCCH candidates, the ending OFDM symbol position of the PDCCH candidate whose time domain starting position is earlier to the PDCCH whose time domain starting position is later The number of OFDM symbols spaced between candidate starting OFDM symbol positions.
  • the terminal device When the terminal device adopts DCI detection hypothesis 1, or DCI detection hypothesis 3, or DCI detection hypothesis 4, the terminal device needs to buffer the received soft information in the time domain position in the processor of the terminal device until the time domain is received.
  • the soft information in the latter position so as to perform a soft combining operation.
  • the time interval between the two interrelated DCIs is relatively long, for example, the time interval between the two interrelated DCIs spans multiple detection ranges or multiple slots, and the terminal device is in the process of detecting other DCIs. , it is still necessary to reserve enough storage space to save the previously acquired soft information, which will seriously increase the hardware burden of the terminal device.
  • the second capability indication information it is possible to effectively limit the interval between the PDCCHs that are related to each other from being too large, so as to avoid the heavy burden of DCI detection on the terminal device.
  • the terminal device may report, through the second capability indication information, when the time interval between the correlated PDCCH candidates is x 1 , the number y 1 of detectable correlated PDCCH candidates, and/or the number y 1 of correlated PDCCH candidates When the time interval between the PDCCH candidates is x 2 , the number y 2 of detectable interrelated PDCCH candidates.
  • the terminal device may report, through the second capability indication information, the number of detectable interrelated PDCCH candidates y 1 , and/or, When the time interval between the time units where the interrelated PDCCH candidates are located is x 2 , the number y 2 of detectable interrelated PDCCH candidates.
  • the second capability indication information may indicate: for the case where the correlated PDCCH candidates are located in two adjacent slots/detection ranges (that is, the time interval between the time units where the correlated PDCCH candidates are located is 0 slot) , the number of interrelated PDCCH candidates that can be supported is x 1 .
  • the interrelated PDCCH candidates are located within two slots/detection ranges separated by one slot/detection range (that is, between the time units where the interrelated PDCCH candidates are located) The time interval is 1 slot), and the number of mutually correlated PDCCH candidates that can be supported is x 2 .
  • the terminal device determines third capability indication information, where the third capability indication information is used to indicate the number of PDCCH candidate pairs that can be supported in the first time unit, and the two PDCCH candidates in each PDCCH candidate pair are mutually
  • the first time unit is greater than a detection range, and the detection number of PDCCH candidates that can be supported within the detection range is used to characterize the DCI detection capability of the terminal device; the terminal device sends the third capability indication information.
  • the third capability indication information is used to indicate the number of supported PDCCH candidates with association relationships configured within the first time unit.
  • the number of detectable PDCCH candidates within a detection range is used to characterize the DCI detection capability of the terminal device. For example, within one slot (the detection range is one slot) and within one carrier/serving cell, the maximum number of detectable PDCCH candidates is 44.
  • a first time unit is defined, and the first time unit may be larger than the detection range.
  • the size of the first time unit is the starting OFDM of the PDCCH candidate whose time position is earlier in the interrelated PDCCH candidates The number of OFDM symbols included between the symbol and the ending OFDM symbol of the PDCCH candidate whose time position is later in the interrelated PDCCH candidates.
  • the number of PDCCH candidates to be detected in a detection range is used to represent the DCI detection complexity. If the number of PDCCH candidates to be detected is greater than the number of detectable PDCCH candidates, it indicates that the DCI detection complexity in the current detection range exceeds that of the terminal equipment. If the detection capability is not greater than the number of detectable PDCCH candidates, it indicates that the DCI detection complexity within the current detection range does not exceed the detection capability of the terminal device.
  • the first time unit includes N detection ranges.
  • the number of OFDM symbols between two correlated PDCCH candidates does not exceed the number of OFDM symbols included in the first time unit. That is, the size of the first time unit limits the maximum time interval between two interrelated PDCCH candidates.
  • the third capability indication information enables the network device to reasonably configure the association relationship of the PDCCH candidates, thereby reducing the detection complexity of the terminal device.
  • DCI detection hypothesis 1 DCI detection hypothesis 3
  • DCI detection hypothesis 4 two PDCCH candidates associated with each other are located in the same detection range.
  • the above-mentioned embodiments can solve the problem that the DCI detection complexity is increased due to the long time of buffering the soft information.
  • the terminal device determines the number of PDCCH candidates to be detected in the first detection range according to the number of first PDCCH candidates; wherein, the detection range where the first PDCCH candidate is located is located before the first detection range, The detection range in which the second PDCCH candidate is located is the first detection range or is located after the first detection range, and the first PDCCH candidate is associated with the second PDCCH candidate.
  • the terminal device needs to detect each PDCCH candidate, if the number of PDCCH candidates to be detected is greater than The maximum number of PDCCH candidates that the terminal device can detect within a detection range, the terminal device needs to determine part of the PDCCH candidates from it to perform detection, and the remaining part of the PDCCH candidates that exceeds the maximum number give up detection.
  • the terminal device wants to determine the number of PDCCH candidates to be detected within a detection range, the priority of the PDCCH candidates located within the detection range is lower than the priority of the PDCCH candidates located before the detection range.
  • the network device or the protocol may further stipulate in advance the correspondence between the DCI detection hypothesis and the maximum time interval between the two correlated PDCCH candidates, or the DCI detection hypothesis and the maximum time interval between the two correlated PDCCH candidates.
  • the network device and the terminal device include corresponding hardware structures and/or software modules for executing each function.
  • the units and method steps of each example described in conjunction with the embodiments disclosed in the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software-driven hardware depends on the specific application scenarios and design constraints of the technical solution.
  • FIG. 12 and FIG. 13 are schematic structural diagrams of possible communication apparatuses provided by embodiments of the present application. These communication apparatuses can be used to implement the functions of the terminal equipment or the network equipment in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments.
  • the communication device may be the terminal device 120 or the terminal device 130 as shown in FIG. 1 , or may be the wireless access network device 120 as shown in FIG. 1 , or may be applied to the terminal device or a module (such as a chip) of a network device.
  • the communication device 1200 includes a processing unit 1210 and a transceiver unit 1220 .
  • the communication apparatus 1200 is configured to implement the functions of the terminal device or the network device in the foregoing embodiments.
  • the processing unit 1210 calls the transceiver unit 1220 to execute: detect the first DCI and the second DCI, the first DCI and the second DCI schedule the same physical downlink shared channel PDSCH, the second DCI The end symbol of the first DCI is later than the end symbol of the first DCI; the first HARQ-ACK message corresponding to the PDSCH is sent, and the earliest feedback time of the first HARQ-ACK message is determined according to the time domain position relationship between the PDSCH and the second DCI.
  • the processing unit 1210 calls the transceiver unit 1220 to execute: send the first DCI and the second DCI, the first DCI and the second DCI schedule the same physical downlink shared channel PDSCH, the second DCI
  • the end symbol is later than the end symbol of the first DCI
  • the first hybrid automatic repeat request response HARQ-ACK message corresponding to the PDSCH is received, and the earliest time of feedback of the first HARQ-ACK message is based on the time domain position relationship between the PDSCH and the second DCI definite.
  • the processing unit 1210 is used to determine first capability indication information, where the first capability indication information is used to indicate a DCI detection hypothesis supported by the communication apparatus, and the DCI detection hypothesis It is used to indicate the DCI detection complexity corresponding to the two PDCCH candidates that are related to each other; the transceiver unit 1220 is used to send the first capability indication information.
  • the transceiver unit 1220 executes: receiving the first capability indication information, where the first capability indication information is used to indicate the DCI detection hypothesis supported by the communication apparatus, and the DCI detection hypothesis is used to indicate the interrelated DCI detection complexity corresponding to the two PDCCH candidates; the processing unit 1210 is configured to send first configuration information to the communication device according to the first capability indication information, where the first configuration information is used to configure the DCI detection hypotheses corresponding to the two PDCCH candidates associated with each other .
  • the communication device 1300 includes a processor 1310 and an interface circuit 1320 .
  • the processor 1310 and the interface circuit 1320 are coupled to each other.
  • the interface circuit 1320 can be a transceiver or an input-output interface.
  • the communication apparatus 1300 may further include a memory 1330 for storing instructions executed by the processor 1310 or input data required by the processor 1310 to execute the instructions or data generated after the processor 1310 executes the instructions.
  • the processor 1310 is used to implement the functions of the above-mentioned processing unit 1210
  • the interface circuit 1320 is used to implement the functions of the above-mentioned transceiver unit 1220 .
  • the terminal device chip When the above communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiments.
  • the terminal device chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal device, and the information is sent by the network device to the terminal device; or, the terminal device chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal device antenna) to send information, the information is sent by the terminal equipment to the network equipment.
  • modules such as a radio frequency module or an antenna
  • the network device chip When the above communication device is a chip applied to a network device, the network device chip implements the functions of the network device in the above method embodiments.
  • the network device chip receives information from other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the terminal device to the network device; or, the network device chip sends information to other modules in the network device (such as a radio frequency module or an antenna). antenna) to send information, the information is sent by the network equipment to the terminal equipment.
  • the processor in the embodiments of the present application may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose 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.
  • a general-purpose processor may be a microprocessor or any conventional processor.
  • the method steps in the embodiments of the present application may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions.
  • Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory (Random Access Memory, RAM), flash memory, read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM) , PROM), Erasable Programmable Read-Only Memory (Erasable PROM, EPROM), Electrically Erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory (Electrically EPROM, EEPROM), registers, hard disks, removable hard disks, CD-ROMs or known in the art in any other form of storage medium.
  • RAM Random Access Memory
  • ROM read-only memory
  • PROM programmable read-only memory
  • PROM Erasable Programmable Read-Only Memory
  • EPROM Electrically Erasable Programmable Read-Only Memory
  • An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and storage medium may reside in an ASIC.
  • the ASIC may be located in a network device or in an end device.
  • the processor and the storage medium may also exist in the network device or the terminal device as discrete components.
  • Computer programs or instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be downloaded from a website site, computer, server or data center Transmission by wire or wireless to another website site, computer, server or data center.
  • a computer-readable storage medium can be any available medium that a computer can access, or a data storage device such as a server, data center, or the like that integrates one or more available media.
  • Usable media can be magnetic media, such as floppy disks, hard disks, magnetic tapes; optical media, such as digital video discs (DVD); and semiconductor media, such as solid state drives (SSDs) ).
  • An embodiment of the present application provides a communication system, where the communication system includes a network device and at least one terminal device, wherein the network device is used to implement the functions of the network device in the foregoing embodiments, and the terminal device is used to implement the terminal device in the foregoing embodiments. function of the device.
  • “at least one” means one or more, and “plurality” means two or more.
  • “And/or”, which describes the relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, it can indicate that 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 related objects are a kind of "or” relationship; in the formula of this application, the character "/” indicates that the related objects are a kind of "division” Relationship.

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  • 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 communication. Ledit procédé comprend les étapes suivantes : un dispositif terminal détecte des premières informations DCI et des secondes informations DCI, les premières informations DCI et les secondes informations DCI programmant le même canal PDSCH et un symbole d'extrémité des secondes informations DCI étant plus tard qu'un symbole d'extrémité des premières informations DCI ; et le dispositif terminal envoie un premier message d'accusé HARQ-ACK correspondant à un canal PDSCH, le temps de rétroaction le plus précoce du premier message d'accusé HARQ-ACK étant déterminé en fonction d'une relation de position dans le domaine temporel entre le canal PDSCH et les secondes informations DCI. Dans le procédé, un temps de rétroaction de message d'accusé HARQ-ACK raisonnable est déterminé dans un scénario de transmission répétée d'un canal PDCCH de sorte à adapter la capacité de traitement d'un dispositif terminal.
PCT/CN2021/072320 2021-01-15 2021-01-15 Procédé et appareil de communication WO2022151435A1 (fr)

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