Communication method, and apparatus

Abstract

A communication method and an apparatus, capable of ensuring normal communication of terminals. In the method, a first node can perform blind detection on candidate PDCCHs in a PDCCH repeated transmission scenario on the basis of a target blind detection mode, wherein the candidate PDCCHs are candidate PDCCHs of a search space set other than Type 3. In existing blind detection schemes, it is difficult for the first node to report a blind detection capability by means of a capability reporting procedure before performing blind detection on other types of candidate PDCCHs, thereby making it difficult for the first node to perform blind detection on candidate PDCCHs of a search space set other than Type 3 in a PDCCH repeated transmission scenario. The embodiments of the present application can implement blind detection in PDCCH repeated transmission scenarios by means of the target blind detection mode, thereby ensuring normal communication of terminals.

Description

Communication methods and devices

[0001] This application claims priority to Chinese Patent Application No. 202510391323.6, filed with the State Intellectual Property Office of China on March 28, 2025, entitled "Communication Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communications, specifically to a communication method and apparatus. Background Technology

[0003] In wireless communication systems, the physical downlink control channel (PDCCH) is primarily used to carry downlink control information (DCI) sent by network devices. Terminals can perform blind detection (BD) on candidate PDCCHs at different aggregation levels (ALs) configured in the search space set to obtain the DCI sent by the network devices.

[0004] In some scenarios, the channel environment for wireless communication is poor. Large-scale, high-fading channel environments can cause wireless communication to fail to meet preset communication quality requirements and result in poor link budgets. Transmitting PDCCH in such environments can lead to difficulties for terminals in successfully receiving and decoding the PDCCH. Therefore, a PDCCH repetition transmission mechanism is needed to enhance PDCCH transmission. However, how the terminal performs blind detection in PDCCH repetition scenarios is a problem that urgently needs to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, embodiments of this application provide a communication method and apparatus that can perform blind detection in scenarios where PDCCH is repeatedly transmitted, thereby ensuring normal communication of the terminal.

[0006] Firstly, a communication method is provided. This method can be executed by a first node, or by a component of the first node, such as its processor, chip, or chip system. It can also be implemented by a logic module or software capable of implementing all or part of the functions of the first node. The following explanation uses the execution of this method by the first node as an example. The communication method includes: obtaining a target blind detection mode; and based on the target blind detection mode, performing blind detection on candidate PDCCHs in a repetitive transmission scenario of PDCCHs; the candidate PDCCHs are candidate PDCCHs from a search space set excluding Type 3.

[0007] Based on the above technical solution, in the technical solution provided by this application embodiment, the first node can perform blind detection on candidate PDCCHs in the scenario of repeated PDCCH transmission based on the target blind detection method. The candidate PDCCH is a candidate PDCCH from the search space set excluding Type 3. Because in current blind detection schemes, it is difficult for the first node to report its blind detection-related capability information through the capability reporting process before performing blind detection on candidate PDCCHs from the search space set excluding Type 3, the first node struggles to perform blind detection on candidate PDCCHs from the search space set excluding Type 3 in the scenario of repeated PDCCH transmission. In this case, the embodiment of this application can achieve blind detection in the scenario of repeated PDCCH transmission through this target blind detection method, thereby ensuring the normal communication of the first node.

[0008] In conjunction with the first aspect mentioned above, in one possible design, the target blind detection method is a pre-configured blind detection method. This pre-configuration approach ensures compatibility with various types of candidate PDCCHs. Furthermore, in scenarios involving repeated PDCCH transmissions, the terminal can directly perform blind detection according to the pre-configured method without requiring network device configuration. Therefore, it will not affect the PDCCH process of other traditional terminals, thus avoiding disruption to their normal communication.

[0009] In conjunction with the first aspect mentioned above, in one possible design, the target blind detection method is a blind detection method that takes effect when the network device enables repeated transmission of PDCCHs in the search space set other than Type 3. Alternatively, the target blind detection method is the default blind detection method among the pre-configured blind detection methods. For repeated transmissions of PDCCHs that can be enabled via signaling, signaling enablement allows for flexible configuration of blind detection methods in different scenarios. For repeated transmissions of PDCCHs that cannot be enabled via signaling, blind detection can be performed using the default blind detection method to avoid affecting communication.

[0010] In conjunction with the first aspect described above, in one possible design, the method includes: receiving indication information from a second node, the indication information being used to indicate a target blind detection method. The indication information is carried in any one of the Master Information Block (MIB), Physical Broadcast Channel (PBCH), or System Information Block (SIB). For example, the indication information can be represented by currently unused fields, reused fields in certain transmission scenarios, or newly added fields. Thus, it can be flexibly configured based on the expansion of the indication information and compatibility with wireless communication.

[0011] In conjunction with the first aspect above, in one possible design, when the indication information is carried in the system information block (SIB), the candidate PDCCH is the candidate PDCCH of the search space set other than Type 0 and Type 0A.

[0012] In conjunction with the first aspect mentioned above, in one possible design, the indication information is taken as one of multiple candidate values, and each candidate value corresponds to a blind detection method. This application adapts to the repeated transmission of PDCCH candidates in various scenarios by configuring different blind detection methods.

[0013] In conjunction with the first aspect mentioned above, in one possible design, the method further includes: initiating random access based on the random access resources corresponding to the target blind detection method; wherein, the random access resources are resources in multiple random access resource groups; at least one random access resource group in the multiple random access resource groups has a mapping relationship with at least one blind detection method in the scenario of repeated transmission of PDCCH, and the target blind detection method is a blind detection method in at least one blind detection method.

[0014] In conjunction with the first aspect mentioned above, in one possible design, the repeated transmission scenario of PDCCH is repeated transmission between time slots; the target blind detection method is one of the following blind detection methods: the first blind detection method is to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the repeated transmission scenario of PDCCH based on the maximum number of blind detections corresponding to the time slot where the last transmission is located in the repeated transmission scenario of PDCCH.

[0015] The second blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the time slot of each transmission.

[0016] The third blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0017] The fourth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the scenario of repeated PDCCH transmission and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0018] Based on the above technical solutions, the embodiments of this application can configure the blind detection method under inter-slot repetition, select the appropriate blind detection method according to actual needs, realize the alignment of the blind detection methods of candidate PDCCH in the scenario of repeated PDCCH transmission between the terminal and the network device, thereby ensuring the flexibility of the network device in configuring control channel resources, while taking into account that the terminal's blind detection capability meets the relevant regulations.

[0019] In conjunction with the first aspect mentioned above, in one possible design, the repeated transmission scenario of PDCCH is repeated transmission within a time slot; the target blind detection method is one of the following blind detection methods: the fifth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the time slots where the multiple transmissions occur in the repeated transmission scenario of PDCCH.

[0020] The sixth blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time span of the last transmission.

[0021] The seventh blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the span in each transmission.

[0022] The eighth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the span in which the last transmission is located.

[0023] The ninth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in each transmission; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the repeated PDCCH transmission scenario and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the span in the last transmission.

[0024] The tenth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the span in which the multiple transmissions of PDCCHs are located in the repeated transmission scenario; the multiple transmissions in the repeated transmission scenario of PDCCHs are transmissions within the same span.

[0025] Based on the above technical solutions, the embodiments of this application can configure the blind detection method under repeated time slots, select the appropriate blind detection method according to actual needs, and realize the alignment of the blind detection methods of candidate PDCCH in the scenario of repeated PDCCH transmission between the terminal and the network device. The above solution requires the terminal to have higher blind detection capability, and at the same time can further increase the flexibility of the network device in configuring PDCCH within the time slot.

[0026] Secondly, a communication method is provided. This method can be executed by a second node, or by a component of the second node, such as its processor, chip, or chip system. It can also be implemented by a logic module or software capable of implementing all or part of the functions of the second node. The following description uses the execution of this method by a second node as an example. This communication method includes: sending indication information; the indication information is used to indicate the target blind detection method for candidate PDCCHs transmitted in a repeated transmission scenario of the Physical Downlink Control Channel (PDCCH); the candidate PDCCHs are candidate PDCCHs from a search space set other than Type 3.

[0027] In conjunction with the second aspect above, in one possible design, the indication information is carried in any one of the main information block (MIB), the physical broadcast channel (PBCH), or the system information block (SIB).

[0028] In conjunction with the second aspect above, in one possible design, where the indication information is carried in the System Information Block (SIB), the candidate PDCCH is the candidate PDCCH of the search space set excluding Type 0 and Type 0A.

[0029] In conjunction with the second aspect mentioned above, in one possible design, the value of the indication information is one of multiple candidate values, and one of the candidate values ​​corresponds to a blind detection method.

[0030] In conjunction with the second aspect above, in one possible design, at least one blind detection method in the repeated transmission scenario of PDCCH has a mapping relationship with at least one random access resource group among multiple random access resource groups, and the target blind detection method is the blind detection method among at least one blind detection method.

[0031] In conjunction with the second aspect above, in one possible design, the PDCCH retransmission scenario is inter-slot retransmission; the target blind detection method is one of the following blind detection methods:

[0032] The first blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the PDCCH repeated transmission scenario, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0033] The second blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the time slot of each transmission.

[0034] The third blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0035] The fourth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the scenario of repeated PDCCH transmission and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0036] In conjunction with the second aspect above, in one possible design, the PDCCH retransmission scenario is intra-slot retransmission; the target blind detection method is one of the following blind detection methods:

[0037] The fifth blind detection method is used to indicate the maximum number of blind detections corresponding to the time slots where multiple transmissions occur in the scenario of repeated transmission of PDCCH, and to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times.

[0038] The sixth blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time span of the last transmission.

[0039] The seventh blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the span in each transmission.

[0040] The eighth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the span in which the last transmission is located.

[0041] The ninth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in each transmission; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the repeated PDCCH transmission scenario and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the span in the last transmission.

[0042] The tenth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the span in which the multiple transmissions of PDCCHs are located in the repeated transmission scenario; the multiple transmissions in the repeated transmission scenario of PDCCHs are transmissions within the same span.

[0043] Thirdly, a communication device is provided for implementing various methods. The communication device includes modules, units, or means corresponding to the implementation of the methods, wherein the modules, units, or means can be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the functions.

[0044] In some possible designs, the communication device may include a processing module and a transceiver module. The processing module can be used to implement the processing functions in any of the above aspects and any possible implementations thereof. The transceiver module may include a receiving module and a transmitting module, respectively used to implement the receiving function and the transmitting function in any of the above aspects and any possible implementations thereof.

[0045] In some possible designs, the transceiver module can consist of transceiver circuits, transceivers, transceivers, or communication interfaces.

[0046] Fourthly, a communication device is provided, comprising: a processor and a memory; the memory being used to store computer instructions that, when executed by the processor, cause the communication device to perform the method described in any of the above aspects and any possible design thereof.

[0047] Fifthly, a communication device is provided, comprising: a processor and a communication interface; the communication interface being used to communicate with a module outside the communication device; the processor being used to execute computer programs or instructions to cause the communication device to perform the methods described in any of the above aspects and any possible designs thereof.

[0048] A sixth aspect provides a communication device comprising: at least one processor; said processor being configured to execute a computer program or instructions stored in a memory to cause the communication device to perform the methods described in any of the foregoing aspects and any possible designs thereof. The memory may be coupled to the processor, or may be independent of the processor.

[0049] In a seventh aspect, a communication device (e.g., a chip or chip system) is provided, the communication device including a processor for implementing the functions involved in any of the above aspects and any possible designs thereof.

[0050] In some possible designs, the communication device includes a memory for storing necessary program instructions and data.

[0051] In some possible designs, when the device is a chip system, it can be composed of chips or contain chips and other discrete components.

[0052] The communication device described in the fifth to seventh aspects may be the first node in the first aspect, or a device included in the first node, such as a chip or chip system; or the communication device may be the second node in the second aspect, or a device included in the second node, such as a chip or chip system.

[0053] Eighthly, a communication system is provided, the communication system including a first node, and may also include modules or units (e.g., chips, chip systems, or circuits) in the first node that perform the methods / operations / steps / actions described in the first aspect, or modules or units that can be used in conjunction with the first node; and / or, the communication system including a second node, and may also include modules or units (e.g., chips, chip systems, or circuits) in the second node that perform the methods / operations / steps / actions described in the second aspect, or modules or units that can be used in conjunction with the second node.

[0054] It is understandable that when the communication device provided by any of the third to eighth aspects is a chip, the sending action / function of the communication device can be understood as outputting information, and the receiving action / function of the communication device can be understood as inputting information.

[0055] A ninth aspect provides a computer-readable storage medium storing a computer program or instructions that, when executed on a communication device, enable the communication device to perform the methods described in any of the foregoing aspects and any possible design thereof.

[0056] In a tenth aspect, a computer program product containing instructions is provided, which, when run on a communication device, enables the communication device to perform the methods described in any of the foregoing aspects and any possible design thereof.

[0057] The technical effects of any of the design methods in aspects three through ten can be found in the technical effects of different design methods in aspects one or two, and will not be repeated here. Attached Figure Description

[0058] Figure 1 is a schematic diagram of the structure of a communication system provided in this application;

[0059] Figure 2 is a schematic diagram of another communication system provided in this application;

[0060] Figure 3 is a flowchart illustrating a communication method provided in this application;

[0061] Figure 4 is a flowchart illustrating another communication method provided in this application;

[0062] Figure 5 is a flowchart illustrating another communication method provided in this application;

[0063] Figure 6 is a mapping diagram of random access resources and blind detection methods provided in this application;

[0064] Figure 7 shows another mapping relationship between random access resources and blind detection methods provided in this application;

[0065] Figure 8 is a scenario diagram of inter-slot repeated transmission provided in this application;

[0066] Figure 9 is a scenario diagram of another type of inter-slot repeated transmission provided in this application;

[0067] Figure 10 is a scenario diagram of another type of inter-slot repeated transmission provided in this application;

[0068] Figure 11 is a scenario diagram of another type of inter-slot repeated transmission provided in this application;

[0069] Figure 12 is a scenario diagram of repeated transmission within a time slot provided in this application;

[0070] Figure 13 is a scenario diagram of another type of repeated transmission within a time slot provided in this application;

[0071] Figures 14-16 are schematic diagrams of the communication device provided in this application. Detailed Implementation

[0072] In the description of this application, unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is merely a description of the relationship between the related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. A and B can be singular or plural.

[0073] In the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0074] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0075] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0076] It is understood that the term "embodiment" used throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, various embodiments throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0077] It is understood that in this application, "...when" and "if" both refer to the corresponding processing that will be carried out under certain objective circumstances, and are not limited to a specific time, nor do they require a judgment action to be performed during implementation, nor do they imply any other limitations.

[0078] It is understood that some optional features in the embodiments of this application can be implemented independently in certain scenarios without relying on other features, such as the current solution on which they are based, to solve the corresponding technical problems and achieve the corresponding effects. Alternatively, they can be combined with other features as needed in certain scenarios. Correspondingly, the apparatus given in the embodiments of this application can also implement these features or functions, which will not be elaborated here.

[0079] In this application, unless otherwise specified, the same or similar parts between the various embodiments can be referred to each other. In the various embodiments of this application, unless otherwise specified or there is a logical conflict, the terminology and / or descriptions between different embodiments are consistent and can be mutually referenced. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships. The following descriptions of the embodiments of this application do not constitute a limitation on the scope of protection of this application.

[0080] To facilitate understanding of the technical solutions of the embodiments of this application, a brief introduction to the relevant technologies of this application is given below.

[0081] In wireless communication systems, the PDCCH is mainly used to carry DCIs sent by network devices. Terminals can perform blind detection on candidate PDCCHs of different ALs configured in the search space set to obtain the DCIs sent by the network devices.

[0082] In some embodiments, the network device can instruct the terminal to detect which DCIs and at which time-domain locations by configuring the search space set. For example, the search space set includes a common search space (CSS) and a user equipment (UE) specific search space (USS). The configuration of the search space set includes information such as the number of candidate PDCCHs for each AL, the monitoring period, and the time-domain location.

[0083] In this application, the time-domain location can be represented by the PDCCH monitoring occasion. The terminal can monitor the time-domain location of the DCI scrambled by the radio network temporary indenter (RNTI) according to the PDCCH monitoring occasion. The time-domain location can be a continuous symbol location or a slot location.

[0084] In this application, the candidate PDCCH can also be referred to as a PDCCH candidate, which is used to represent the PDCCH that the network device may issue. For a candidate PDCCH under a certain AL configured in the search space set, the terminal needs to determine the corresponding monitoring timing when performing blind detection, and perform blind detection on each candidate PDCCH of different ALs in the control resource set (CORESET) one by one until the DCI format to be monitored is detected, or until the maximum number of blind detections is reached.

[0085] Optionally, there are various types of PDCCH, such as, but not limited to, CSS PDCCH and USS PDCCH.

[0086] Taking the PDCCH of a CSS as an example, this CSS can be of type Type 0, Type 0A, Type 1, Type 2, etc. Type 0 CSS is used to schedule main system information blocks (e.g., SIB1), and Type 0A CSS is used to schedule other system information (OSI), such as SIB19. Type 1 CSS is used to schedule random access information; taking step-4 random access as an example, random access information includes random access response (RAR, also known as Msg2) and Msg4. Type 2 CSS is used to schedule paging messages. In some examples, the PDCCH of the above types of CSS can be transmitted using inter-slot repetition or intra-slot repetition. For example, Type 0 PDCCH can use inter-slot repetition, while other types of CSS can use intra-slot repetition.

[0087] In some scenarios, the channel environment for wireless communication is poor. Large-scale, high-fading channel environments can cause wireless communication to fail to meet preset communication quality requirements and result in poor link budgets. Transmitting PDCCH in such environments can lead to difficulties for terminals in successfully receiving and decoding the PDCCH. Therefore, a PDCCH retransmission mechanism is needed to enhance downlink coverage. However, how to perform blind detection in PDCCH retransmission scenarios is a problem that urgently needs to be solved.

[0088] The PDCCH repetition mechanism refers to network devices repeatedly transmitting the PDCCH multiple times to increase the success rate of blind detection by the terminal. PDCCH repetition can include inter-slot repetition or intra-slot repetition. Inter-slot repetition means that the network device repeatedly transmits the PDCCH across multiple time slots. Intra-slot repetition means that the network device repeatedly transmits the PDCCH within a single time slot.

[0089] In one example, the repeated transmission of Type 3 and USS PDCCH can be achieved through the terminal's capability reporting process. Specifically, before implementing the repeated transmission of Type 3 and USS PDCCH, the terminal can report blind detection capability information to the network device during the capability reporting process after initial network access. This blind detection capability information is used to indicate the terminal's blind detection capability. Correspondingly, the network device receives the blind detection capability information reported by the terminal and configures the transmission of PDCCH according to the reported blind detection capability information.

[0090] Optionally, the value of this blind detection capability information can be 2BD or 3BD. For example, this blind detection capability information can be represented in the following way:

[0091] mTRP-PDcCH-Repetition-r17 SEQUENCE{

[0092] numBD-twoPDCCH-r17 INTEGER(2..3),

[0093] maxNumOverlaps-r17 ENUMERATED{n1,n2,n3,n5,n10,n20,n40}

[0094] In this example, the terminal's capability reporting process can only be initiated after the terminal has initially accessed the network. Therefore, the above-mentioned scheme for repeated PDCCH transmission is difficult to apply to other types of PDCCH. For example, it is difficult to apply to the repeated transmission of PDCCH before the initial access to the network. In other words, the above-mentioned repeated transmission scheme for Type 3 and USS PDCCH is not universally applicable.

[0095] Based on this, in the technical solution provided by this application embodiment, the first node can perform blind detection on candidate PDCCHs in the scenario of repeated PDCCH transmission based on a target blind detection method. The candidate PDCCHs are candidate PDCCHs from the search space set excluding Type 3. Because in current blind detection schemes, it is difficult for the first node to report its blind detection capability information through a capability reporting process before performing blind detection on candidate PDCCHs from the search space set excluding Type 3, the first node struggles to perform blind detection on candidate PDCCHs from the search space set excluding Type 3 in the scenario of repeated PDCCH transmission. In this case, this application embodiment can achieve blind detection in the scenario of repeated PDCCH transmission through this target blind detection method, thereby ensuring normal communication of the first node.

[0096] The technical solutions of this application embodiment can be used in various communication systems, including third-generation partnership project (3GPP) communication systems, such as fourth-generation (4G) systems like Long Term Evolution (LTE), fifth-generation (5G) systems like New Radio (NR), LTE and 5G hybrid networking systems, integrated communication and sensing systems, non-terrestrial networks (NTN), device-to-device (D2D) communication systems, vehicle-to-everything (V2X) communication systems, machine-type communication (MTC) systems, Internet of Things (IoT) systems, satellite communication systems, short-range systems, Global System for Mobile Communications (GSM), Enhanced Data Rate for GSM Evolution (EDGE), Wideband Code Division Multiple Access (WCDMA), and Code Division Multiple Access 2000 systems. The system can be CDMA2000, Time Division-Synchronization Code Division Multiple Access (TD-SCDMA), or other future communication systems. This communication system can also be a non-3GPP communication system; there are no restrictions.

[0097] The communication systems described above are merely illustrative examples, and are not limited to those described herein. The communication systems provided in this application do not impose any limitations on the solutions described herein. This will be explained uniformly here and will not be repeated below.

[0098] Figure 1 is a schematic diagram illustrating the structure of a possible, non-limiting communication system. As shown in Figure 1, the communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. RAN 100 includes at least one RAN node (110a and 110b in Figure 1, collectively referred to as 110) and at least one terminal (120a-120j in Figure 1, collectively referred to as 120). RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1). Terminal 120 is wirelessly connected to RAN node 110. RAN node 110 is connected to core network 200 wirelessly or via wired connection. The core network node in core network 200 and RAN node 110 in RAN 100 can be different physical devices, or they can be the same physical device integrating core network logical functions and radio access network logical functions.

[0099] In one possible implementation, a core network node can refer to equipment in the core network 200 that provides service support to terminal 120. The core network node in core network 200 may include at least one of the following: access and mobility management function (AMF) network elements, session management function (SMF) network elements, user plane function (UPF) network elements, policy control function (PCF) network elements, unified data management (UDM) network elements, application function (AF) network elements, network exposure function (NEF) network elements, network slice selection function (NSSF) network elements, or location management function (LMF) network elements, etc. Of course, core network 200 may also include other core network nodes, without limitation.

[0100] The AMF (Agency Flow Management) network element is deployed in the core network 200 to provide mobility management and connectivity management for the network, such as user location updates, user registration with the network, and user handover. The AMF network element can act as an intermediate route between the LMF, SMF, and RAN 100. The SMF network element is mainly responsible for session management in the mobile network, such as session establishment, modification, and release. The UPF (User Plane Function) network element is a user plane function element, mainly responsible for connecting to external networks and processing user packets, such as forwarding and charging. The PCF (Programmable Flow Function) network element is mainly responsible for providing policies to the AMF and SMF, such as Quality of Service (QoS) policies and slice selection policies. The UDM (User DM) network element is used to store user data, such as subscription information and authentication / authorization information. The AF (Agency Flow) network element is responsible for providing services to the 3GPP network. The NEF (Network Flow Function) network element is mainly used to open the capabilities of various network functions and is responsible for converting internal and external information. The LMF network element is a device or component deployed in the core network 200 to provide positioning functions for the terminal 120; for example, the LMF network element can initiate a positioning process to locate a specific terminal.

[0101] In this application, network elements may also be referred to as entities or functional entities. For example, an AMF network element may also be referred to as an AMF entity or an AMF functional entity. In addition, the aforementioned SMF network elements, UPF network elements, PCF network elements, UDM network elements, AF network elements, NEF network elements, and LMF network elements may have other names in future communication systems, and this application does not impose specific limitations on them.

[0102] In one possible implementation, RAN 100 can be a 3rd Generation Partnership Project (3GPP) related cellular system, such as a 4G, 5G mobile communication system, or a future-oriented evolution system. RAN 100 can also be an open RAN (O-RAN or ORAN), a cloud radio access network (CRAN), an NTN network (such as an NTN supporting pass-through mode and / or regenerative mode, or an NTN supporting eye-viewing mode (earth fixed cell) and / or non-eye-viewing mode (earth moving cell), or a wireless fidelity (WiFi) system. RAN 100 can also be a communication system that integrates two or more of the above systems.

[0103] RAN node 110, sometimes also referred to as access network equipment, RAN entity, or access node, constitutes part of the communication system and is used to help terminals achieve wireless access. Multiple RAN nodes 110 in RAN 100 can be of the same type or different types. In some scenarios, the roles of RAN node 110 and terminal 120 are relative. For example, network element 120i in Figure 1 can be a helicopter or drone, which can be configured as a mobile base station. For terminals 120j accessing RAN 100 through network element 120i, network element 120i is a base station; but for base station 110a, network element 120i is a terminal. RAN node 110 and terminal 120 are sometimes both referred to as communication devices. For example, network elements 110a and 110b in Figure 1 can be understood as communication devices with base station functions, and network elements 120a-120j can be understood as communication devices with terminal functions.

[0104] For RAN node 110, in one possible scenario, RAN node 110 can be a base station, an evolved NodeB (eNodeB, also known as eNB), an access point (AP), a transmission reception point (TRP), a next-generation NodeB (gNB), a next-generation base station in a future mobile communication system, or an access node in a WiFi system, etc. RAN node 110 can be a macro base station (as shown in Figure 1, 110a), a micro base station or indoor station (as shown in Figure 1, 110b), a relay node or donor node, or a radio controller in a CRAN scenario. Examples include: satellite base stations, radio network controllers (RNCs), base station controllers (BSCs), base transceiver stations (BTSs), home base stations (e.g., home evolved NodeBs, or home NodeBs, HNBs), relay stations, balloon stations, drone stations, radio backhaul nodes, or grant nodes (G nodes) in satellite flash, etc. It is understood that network equipment can be either ground-based or non-ground-based (such as satellites, drones, high-altitude communication equipment, etc.). Furthermore, the names of network equipment with base station functions may differ in communication systems employing different wireless access technologies; this application does not limit this. Optionally, RAN node 110 can also be a server, wearable device, vehicle, or in-vehicle equipment. For example, the access network equipment in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). RAN node 110 is also referred to as a next-generation RAN (NG-RAN) node.

[0105] In another possible scenario, multiple RAN nodes 110 collaborate to assist the terminal in achieving wireless access, with each RAN node 110 implementing a portion of the base station's functions. For example, a RAN node 110 can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. CUs and DUs can be set up separately or included in the same network element, such as a baseband unit (BBU). RUs can be included in radio frequency equipment or radio frequency units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs).

[0106] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules.

[0107] In one possible scenario, terminal 120 can be a device used to implement wireless communication functions, such as a terminal, a chip or circuit that can be used in the terminal, or an entity associated with the terminal. Specifically, terminal 120 can be user equipment (UE), access terminal, terminal unit, terminal station, mobile station (MS), mobile station, remote station, remote terminal, mobile device, wireless communication equipment, terminal agent or terminal device, subscriber unit, smartphone, wireless data card, tablet computer, wireless modem, laptop computer, machine-type communication (MTC) terminal, tag, etc., in a 5G network or a future evolved public land mobile network (PLMN). The access terminal can be a cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handset with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle device or wearable device, virtual reality (VR) terminal, augmented reality (AR) terminal, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical care, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, or terminal node (T-node) in StarSpark, etc. In one possible implementation, terminal 120 can be mobile or fixed. It is understood that the terminal and the mobile user can be completely independent. All information related to a user can be stored in a subscriber identity module (SIM) card, which can be used on a terminal device.Terminals can interact with network devices by sending and / or receiving signals over the air interface.

[0108] The chip or circuit in the terminal includes components inside the terminal, such as at least one of a chip, a central processing unit (CPU), a network processing unit (NPU), and a terminal radio frequency module.

[0109] Entities associated with the terminal include terminal-side servers, computing / processing nodes, computing / processing entities, computing / processing units, and servers such as over-the-top (OTT) servers. OTT refers to various services provided to users by a third party other than the network operator via the operator's network. Examples of OTT services include OTT voice communication services, OTT multimedia services, and OTT data processing services. The terminal interacts with relevant information (e.g., data) through communication with this associated network entity. For example, this associated network entity and the terminal may belong to the same vendor. Since model training, model selection, etc., may not be executed on the terminal but rather on the terminal-side OTT server, the term "terminal" in this embodiment also includes the terminal-side OTT server.

[0110] It should be understood that the terminal in this embodiment may also be referred to as the "UE side" or the "UE part".

[0111] Taking a 5G NTN scenario as an example, Figure 2 illustrates an exemplary implementation of the system shown in Figure 1. This communication system may include a RAN node 110, a terminal 120, a ground station 130, core network elements, and a data network (DN). The core network elements include a UPF element 140, an AMF element 150, and an SMF element 160. Among them, the UPF element 140 is a user plane element, and the AMF element 150 and SMF element 160 are control plane elements.

[0112] Terminal 120 can access RAN node 110 via 5G New Radio (NR). RAN node 110 can be deployed on a satellite and establish a communication connection with ground station 130 via a wireless link, thereby accessing the terrestrial core network. RAN node 110 can exchange non-access stratum (NAS) signaling and user plane service data with ground station 130 via the NG interface. Furthermore, RAN nodes 110 deployed on different satellites can establish wireless links via the Xn interface, enabling signaling exchange and user data transmission between RAN nodes 110.

[0113] It is understood that Figure 2 above is merely a schematic diagram and does not constitute a limitation on the applicable scenarios of the technical solutions provided in this application. Those skilled in the art should understand that in specific implementation processes, the communication system shown in Figure 2 may include fewer devices than those shown in Figure 2, or the communication system shown in Figure 2 may also include other devices. At the same time, the number of devices in the communication system shown in Figure 2 can be determined according to specific needs and is not limited.

[0114] Optionally, the devices in Figure 2, such as RAN node 110, terminal 120, ground station 130, and core network elements, can also be referred to as communication devices. They can be general-purpose devices or special-purpose devices. This application embodiment does not specifically limit them.

[0115] It is understood that the system described in the embodiments of this application is for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and does not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0116] The following description uses a communication device (including a first node, a second node, or other nodes) as an example to illustrate the communication method provided in this application. The communication method provided in this application is applicable to the communication systems mentioned above, and also to other communication systems not mentioned. In the following embodiments of this application, the message names, parameter names, or information names between the first node and other nodes are merely examples, and may be other names in other embodiments. The method provided in this application does not specifically limit these names.

[0117] It is understood that in the embodiments of this application, each communication device may execute some or all of the steps in the embodiments of this application. These steps or operations are merely examples, and the embodiments of this application may also execute other operations or variations thereof. Furthermore, the steps may be executed in different orders as presented in the embodiments of this application, and it is not necessary to execute all the operations in the embodiments of this application.

[0118] It is understood that this application uses a communication device (e.g., a first node, a second node) as the executor for illustrative purposes. For example, the first node can be a terminal, and the second node can be a base station, but this application does not limit the executor. For instance, the method executed by the first node in this application can also be executed by a module (e.g., a chip, a chip system, or a processor) applied to the first node, or by a logic node, logic module, or software capable of implementing all or part of the functions of the first node. Or, for example, the method executed by the second node in this application can also be executed by a module (e.g., a chip, a chip system, or a processor) applied to the second node, or by a logic node, logic module, or software capable of implementing all or part of the functions of the second node.

[0119] The communication method provided in the embodiments of this application is described below. As shown in Figure 3, the communication method may include:

[0120] Step 301: The first node performs blind detection on the candidate PDCCH in the scenario of repeated transmission of PDCCH based on the target blind detection method.

[0121] Among them, candidate PDCCH is the candidate PDCCH of the search space set other than type Type3.

[0122] In some embodiments, the target blind detection method can be one of a plurality of blind detection methods.

[0123] In this application, the blind detection method can also be referred to as blind detection mode (BD mode), blind detection count mode (BD count mode), blind detection counting method, blind detection mechanism, etc., to define the configuration of terminal blind detection. The representation of this blind detection method is not limited in the embodiments of this application. The candidate PDCCH can also be referred to as a candidate PDCCH, PDCCH candidate, or PDCCH candidate. The repeated transmission of PDCCH can also be represented as PDCCH repetition.

[0124] For example, in the embodiments of this application, different blind detection methods can be represented by 1BD, 2BD, or 3BD, etc., where the numerical value can represent the number of blind detection rounds. Taking the scenario of repeated transmission of PDCCH in two transmissions as an example, 2BD can be represented as performing blind detection separately on the candidate PDCCH in the first transmission and separately on the candidate PDCCH in the second transmission. 3BD can be represented as adding blind detection on the candidate PDCCH after soft-combine of the candidate PDCCH in the two transmissions, that is, performing a total of 3 blind detections.

[0125] In transmission scenarios with poor channel conditions, blind detection of the candidate PDCCH after soft combining by the first node is beneficial to improving the decoding success rate. In scenarios involving repeated PDCCH transmission, each transmission can transmit one or more candidate PDCCHs. In this embodiment, blind detection of candidate PDCCHs means performing blind detection on one or more candidate PDCCHs transmitted in the current round, without exceeding the limit on the number of blind detections. For ease of description, the number of candidate PDCCHs transmitted in each round will not be further specified.

[0126] Based on this, in the technical solution provided by this application embodiment, the first node can perform blind detection on candidate PDCCHs in the scenario of repeated PDCCH transmission based on a target blind detection method. The candidate PDCCHs are candidate PDCCHs from the search space set excluding Type 3. Because in current blind detection schemes, it is difficult for the first node to report its blind detection capability information through a capability reporting process before performing blind detection on candidate PDCCHs from the search space set excluding Type 3, the first node struggles to perform blind detection on candidate PDCCHs from the search space set excluding Type 3 in the scenario of repeated PDCCH transmission. In this case, this application embodiment can achieve blind detection in the scenario of repeated PDCCH transmission through this target blind detection method, thereby ensuring normal communication of the first node.

[0127] In some embodiments, the blind inspection method is used to determine the blind inspection object and / or the limit on the number of blind inspections; or to specify the blind inspection object and / or the limit on the number of blind inspections during blind inspection.

[0128] For example, the blind detection objects include candidate PDCCHs transmitted multiple times in the scenario of repeated PDCCH transmission, and / or candidate PDCCHs after soft merging of candidate PDCCHs transmitted multiple times in the scenario of repeated PDCCH transmission.

[0129] In some embodiments, the blind detection limit can be configured according to different granularities, representing the maximum number of blind detections of candidate PDCCHs (e.g., candidate PDCCHs of CSS Type, candidate PDCCHs of USS Type) on a unit resource (e.g., unit time) of the corresponding granularity. The maximum number of blind detections can also be represented as the maximum number of candidate PDCCHs.

[0130] For example, the blind detection count limit can be used to characterize the maximum number of blind detections per slot in a PDCCH retransmission scenario, or it can be used to characterize the maximum number of blind detections per span in a PDCCH retransmission scenario. In this embodiment, the blind detection count limit can also be configured with other granularities. Table 1 below shows the relationship between the three blind detection methods, the blind detection object, and the blind detection count limit in a retransmission scenario with two retransmissions:

[0131] Table 1. Relationship between blind inspection methods, blind inspection targets, and limits on the number of blind inspections.

[0132] Table 1 above only uses three blind detection methods in the scenario of repeated transmission twice as examples. The blind detection objects corresponding to each blind detection method can be configured according to actual needs. The blind detection objects shown in Table 1 are the selectable blind detection objects, and the content showing the limit on the number of blind detections is the granularity of the number of blind detections, for example, 1. st This can be represented as the candidate PDCCH for the first transmission, 2 nd It can be represented as a candidate PDCCH for the second transmission, and merging can be represented as a candidate PDCCH after soft merging of two transmissions. The limit on the number of blind detections can be at the time slot granularity or the span granularity, and the specific number can be configured according to actual needs.

[0133] In this application, taking the blind detection count limit corresponding to the time slot granularity as an example, for the first node that has not received the monitoring capability configuration (e.g., the first node in the initial access phase, which cannot receive the monitoring capability configuration in the RRC configuration since it has not yet entered the connected state), the network device can define the blind detection count limit according to the following Table 2:

[0134] Table 2. Correspondence between different subcarrier spacing (SCS) configurations and the maximum number of blind detections.

[0135] For subcarrier spacing configuration μ=0 (corresponding to subcarrier spacing of 15KHz), the maximum number of candidate PDCCHs monitored by the first node in each time slot (blind detection limit) is 44, and so on.

[0136] For the first node entering the RRC connected state, the network device can send an RRC message to the terminal. This RRC message carries a monitoring capability configuration (monitoringCapabilityConfig), which is used to configure the granularity of the blind detection limit for the terminal, such as time slot granularity or span granularity. The time slot granularity can be found in Table 2 above.

[0137] In this application, regarding the limit on the number of blind detections corresponding to the span granularity, the first node can report the monitoring capability information of the span granularity to the network device. The monitoring capability information of the span granularity can be represented as a combination of multiple (X, Y), where X is the span interval supported by the terminal for monitoring, and Y is the number of symbols occupied by the span within the span interval. Subsequently, the network device can receive the monitoring capability information of the span granularity and define the limit on the number of blind detections of the span granularity according to the reported monitoring capability information of the span granularity as shown in Table 3 below:

[0138] Table 3. Correspondence between different subcarrier spacing configurations, monitoring capabilities, and maximum number of blind detections.

[0139] For the subcarrier spacing configuration μ = 0 (15KHz), the first node supporting (7,3) span monitoring has a maximum number of candidate PDCCHs (blind detection limit) monitored on each span of 44, and so on.

[0140] As can be seen from the above examples, the larger the maximum number of blind detections per unit granularity, the more flexible the network device is in configuring control resources. Correspondingly, the requirements for the blind detection capability of the first node are also higher (i.e., the higher the device complexity).

[0141] Currently, for blind detection of candidate PDCCHs of Type 3 CSS and USS, since the terminal is already in RRC connected state, it can report the blind detection capability of the candidate PDCCH to configure the relevant blind detection. However, for candidate PDCCHs of other types of CSS, since the terminal is not in RRC connected state, there is no relevant process to align the relevant information on candidate PDCCH blind detection between the network device and the terminal. This makes it difficult for the terminal to reasonably perform blind detection of the above types of candidate PDCCHs in scenarios of repeated PDCCH transmission.

[0142] In summary, as one embodiment of this application, the blind detection method in this application can be configured through pre-configuration, through network device instruction, or through terminal reporting to inform the network device, thereby achieving the effect of configuring the terminal to perform blind detection on candidate PDCCH.

[0143] In this way, the embodiments of this application enable the terminal and network device to align the blind detection methods of candidate PDCCHs in scenarios of repeated PDCCH transmission, thereby ensuring the flexibility of network devices in configuring control channel resources, while also ensuring that the terminal's blind detection capability meets relevant regulations. For example, when CSS and USS are monitored together, the upper limit of the terminal's monitoring of candidate PDCCHs for each search space set and AL can be configured comprehensively, and the network device can also configure the number of candidate PDCCHs for each search space set according to the terminal's blind detection capability.

[0144] In this application, the configuration methods for PDCCH of different CSS types may be the same or different.

[0145] For example, Table 4 below shows the relationship between configuration methods and CSS types in this application embodiment.

[0146] Table 4 Relationship between Configuration Methods and CSS Types

[0147] Among them, "none / pre-configured" belongs to pre-configuration, "master indication block (MIB), physical boardcast channel (PBCH), system information block (SIB)" belongs to network device indication, and "UE report" belongs to terminal reporting.

[0148] For configuration methods that do not require signaling interaction (i.e., pre-configuration) and MIB / PBCH, it is applicable to all types of CSS (including CSS types other than Type 3). For SIB configuration methods, it is applicable to CSS types of Type 0A, Type 1, Type 2, Type 1A, and Type 2A. For UE reporting, it is applicable to CSS types of Type 1, Type 2, Type 1A, and Type 2A.

[0149] The technical solutions provided in the embodiments of this application are described below from the aspects of pre-configuration, network device indication, and terminal reporting.

[0150] 1. The target blind detection method is pre-configured.

[0151] For example, the target blind detection method is a blind detection method that takes effect when the network device enables repeated transmission of PDCCH for search space sets other than Type 3, or the target blind detection method is the default blind detection method among the pre-configured blind detection methods.

[0152] Taking the scenario of repeated transmission of PDCCH in two transmissions as an example, the target blind detection method can be a fixed blind detection method, such as 1BD, 2BD, or 3BD. When the network device enables repeated transmission of candidate PDCCH of Type 0 (or other types) to the terminal, the agreed blind detection method configuration takes effect. Alternatively, when the repeated transmission of candidate PDCCH cannot be enabled by signaling, the first node can use the default blind detection method to perform blind detection according to the relevant protocol. The technical solution provided in this application embodiment is also applicable to the scenario of repeated transmission of PDCCH with more transmissions, such as 3 times or 4 times, and the parameters and values ​​of the corresponding blind detection method configuration can also be adjusted accordingly.

[0153] II. The target blind detection method can be indicated by the network device. Referring to Figure 3 and Figure 4, this method further includes the following steps:

[0154] Step 401: The second node sends an instruction message. Correspondingly, the first node receives the instruction message from the second node.

[0155] The indication information is used to indicate the target blind detection method. For example, the second node can be a RAN node, and the second node can send the indication information via broadcast.

[0156] In some embodiments, the indication information is carried in any of the signaling messages in the MIB, PBCH, or SIB.

[0157] For example, the indication information can be carried in a field that is not currently used in the signaling message (such as a reserved field / R field), or it can reuse a field that is already used in the signaling message, or it can be carried in a field that is newly added to the signaling message.

[0158] For example, for MIB, this indication information can be represented by a spare / reserved bit, which can be mapped to two blind detection methods (such as 1BD, 2BD) depending on the value of the bit.

[0159] For example, in wireless communication in the FR1 < 3 GHz band, the PBCH payload has two unused reserved bits. Instruction information can be obtained through Characterization. Two bits can be mapped to four blind detection methods (e.g., 1BD, 2BD, 3BD, 4BD) based on different values. It should be understood that this application does not limit the number of bits included in the indication information or the values ​​of the indication information; other values ​​can also be used, and this application does not limit them. The blind detection methods corresponding to different values ​​can be referred to the following description, which will not be repeated here.

[0160] In some embodiments, the indication information described above can be effective for specific terminal types. For example, the indication information can be effective for NTN terminals. In this way, it can avoid affecting the monitoring of PDCCH by legacy terminals and has strong compatibility.

[0161] In some embodiments, the indication information can also reuse previously used fields, such as DMRS-TypeA-Position (1 bit), cellBarred (1 bit, not used for NTN access), intraFreqReselection (1 bit), HalfFrameIndication (1 bit), and Choice (1 bit) in the PBCH. Field reuse is achieved through re-interpretation. Taking the NTN scenario as an example, the above fields can be configured as indication information for blind detection methods in the NTN scenario. The NTN terminal can re-interpret the bits corresponding to the above fields. For example, different values ​​of one of the fields can be interpreted as two blind detection methods.

[0162] In some embodiments, when the indication information is carried in the SIB, the candidate PDCCH is the candidate PDCCH of the search space set other than Type 0 and Type 0A.

[0163] For example, the SIB can be SIB1 or other SIBx, and the candidate PDCCH can be a candidate PDCCH for Type 1 or Type 2 CSS. The indication information can be represented by a new information element (IE) in the SIB. For example, the IE can indicate a blind detection method, and different values ​​can indicate different blind detection methods.

[0164] In some embodiments, the value of the indication information is one of a plurality of candidate values, and one of the candidate values ​​corresponds to a blind detection method.

[0165] It should be understood that the indication information in the embodiments of this application may also indicate fewer or more blind detection methods. The specific method can be set according to the actual situation (e.g., the number of available bits, blind detection configuration requirements, etc.). The relevant description of the blind detection method can be found in the following content, and will not be repeated here.

[0166] Based on the above technical solution, in this embodiment, the second node can issue an instruction message to indicate the target blind detection method in the repeated transmission scenario of PDCCH, so that the first node can perform blind detection on the candidate PDCCH in the repeated transmission scenario of PDCCH according to the target blind detection method. This realizes the alignment of the blind detection method of the candidate PDCCH in the repeated transmission scenario of PDCCH between the terminal and the network device, thereby ensuring the flexibility of the network device in configuring control channel resources, while also ensuring that the terminal's blind detection capability meets the relevant regulations.

[0167] Third, the target blind detection method informs the network device through terminal reporting.

[0168] Referring to Figure 3, as shown in Figure 5, the method further includes the following steps:

[0169] Step 501: The first node initiates random access based on the random access resources corresponding to the target blind detection method.

[0170] Among them, random access resources are resources in multiple random access resource groups, and at least one random access resource group has a mapping relationship with at least one blind detection method in the scenario of repeated transmission of PDCCH. The target blind detection method is the blind detection method among at least one blind detection method.

[0171] For example, the first node can determine the target blind detection method from multiple blind detection methods based on its own blind detection capabilities. The mapping relationship between random access resources and the target blind detection method can be configured by the second node or pre-configured.

[0172] It should be understood that for candidate PDCCHs in the search space set other than Type3, since the first node is not in the RRC connected state at this time, it cannot directly report its blind detection capability through the capability reporting process. Therefore, in this embodiment, the first node can indirectly report its blind detection method through other means, such as establishing a mapping relationship between communication resources and blind detection methods. In this way, the network device can determine the blind detection capability of the first node based on the communication resources used by the first node.

[0173] In some embodiments, the random access resource is a preamble index or a random access channel occasion (RO), also known as a random access channel (RACH) occasion. For traditional RACH resources, network devices can be configured according to relevant schemes, such as configuring traditional RACH resources via SIB. For the random access resources involved in the embodiments of this application, the first node and the second node can be configured according to a random access resource group, and a mapping relationship between the random access resource group and the blind detection method can be established.

[0174] For example, a random access resource group can be mapped to a blind detection method, or multiple random access resource groups can be mapped to a blind detection method.

[0175] Taking the preamble index as an example, as shown in Figure 6, in a traditional RACH configuration, each RO includes x preamble indexes, numbered from 0 to x-1. In this embodiment, y preamble indexes can be added to each RO based on the original configuration. These preamble indexes can be numbered consecutively with the original preamble indexes. The newly added y preamble indexes can be divided into two preamble index groups. The first preamble index group can be mapped to one blind detection method (e.g., 1BD), and the second preamble index group can be mapped to another blind detection method (e.g., 2BD). For traditional terminals, the original preamble indexes can still be used for random access. For terminals in the PDCCH repetitive transmission scenario in this embodiment, the newly added preamble indexes can be used for random access, and the selected blind detection method can be indirectly reported by selecting preamble indexes from different preamble index groups.

[0176] Taking RO as an example, as shown in Figure 7, each association period includes multiple traditional ROs (the unshaded blocks above the coordinate axis in Figure 7) and additional ROs that have a mapping relationship with the blind detection method (the shaded blocks below the coordinate axis in Figure 7). The additional ROs can be divided into two RO groups. The first RO group can be mapped to one blind detection method (e.g., 1BD), and the second RO group can be mapped to another blind detection method (e.g., 2BD). For traditional terminals, the original ROs can still be used for random access. For terminals in the PDCCH repetitive transmission scenario in this application embodiment, the additional ROs can be used for random access, and the selected blind detection method can be indirectly reported by selecting ROs from different RO groups.

[0177] Based on the above technical solution, in this embodiment, the first node can initiate random access based on the random access resources corresponding to the target blind detection method. Since there is a mapping relationship between the blind detection method and the random access resource group, the network side can determine the blind detection method selected by the first node through the random access resources used by the first node during random access, which facilitates the subsequent network device to configure PDCCH retransmission according to the blind detection method reported by the first node. Since the terminal does not establish a connection with the network device in the PDCCH retransmission of other CSSs (such as Type 1, Type 2, Type 1A, Type 2A, etc.) other than Type 0, Type 0A, and Type 3, and cannot directly report its own blind detection capability, the terminal can report its own blind detection capability through indirect reporting (such as initiating random access using random access resources that have a mapping relationship with the blind detection method during the random access process), thereby realizing the alignment of the blind detection methods of candidate PDCCHs between the terminal and the network device in the PDCCH retransmission scenario.

[0178] As one embodiment of this application, different blind detection methods can be adopted in different scenarios. For example, current PDCCH retransmission includes inter-slot retransmission and intra-slot retransmission. The blind detection methods in the embodiments of this application will be described below from the perspectives of inter-slot retransmission and intra-slot retransmission.

[0179] Scenario 1: The PDCCH retransmission scenario involves inter-slot retransmission. The target blind detection method is one of the following:

[0180] The first blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the PDCCH repeated transmission scenario, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0181] For example, taking the scenario of repeated transmission of PDCCH in two transmissions as an example, as shown in Figure 8, the first transmission of the candidate PDCCH is in time slot #1, and the second transmission is in time slot #2 (the figure shows the system bandwidth occupied by the control resource set where the candidate PDCCH is located and the time slot where the transmission is located). In this case, the first blind detection mode can be represented as BD count mode = 1BD, that is, the number of blind detection rounds is 1. The first blind detection mode can be that the terminal only performs blind detection on the candidate PDCCH after soft merging of the two transmissions in time slot #2, and the blind detection count occupies the maximum number of blind detections in time slot #2, for example, 44 times.

[0182] It should be understood that the blind detection round here refers to the number of blind detection passes in the scenario of repeated PDCCH transmission by the terminal. Each transmission includes one or more candidate PDCCHs. When the terminal performs blind detection on all one or more candidate PDCCHs transmitted, it is counted as one blind detection round.

[0183] This first blind detection method can cancel the blind detection count of the terminal in time slot #1, which is beneficial to improve the flexibility of network equipment in configuring control resources in time slot #1, and can also reduce the complexity of blind detection of the terminal.

[0184] The second blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the time slot of each transmission.

[0185] For example, taking the scenario of repeated transmission of PDCCH in two transmissions as an example, as shown in Figure 9, the first transmission of the candidate PDCCH is in time slot #1, and the second transmission is in time slot #2 (the figure shows the system bandwidth occupied by the control resource set where the candidate PDCCH is located and the time slot where the transmission is located). In this case, the second blind detection method can be represented as BD count mode = 2BD, that is, the number of blind detection rounds is 2. The second blind detection method can be that the terminal performs blind detection on the candidate PDCCH of the first transmission in time slot #1, and the blind detection count occupies the maximum number of blind detections in time slot #1. The terminal performs blind detection on the candidate PDCCH of the second transmission in time slot #2, and the blind detection count occupies the maximum number of blind detections in time slot #2.

[0186] The third blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0187] For example, taking the scenario of repeated transmission of PDCCH in two transmissions as an example, as shown in Figure 10, the first transmission of the candidate PDCCH is in time slot #1, and the second transmission is in time slot #2 (the figure shows the system bandwidth occupied by the control resource set where the candidate PDCCH is located and the time slot where the transmission is located). In this case, the third blind detection method can be represented as BD count mode = 2BD, that is, the number of blind detection rounds is still 2. The third blind detection method can be that the terminal performs blind detection on the candidate PDCCH of the first transmission in time slot #1, and the blind detection count occupies the maximum number of blind detections in time slot #1. The terminal performs blind detection on the candidate PDCCH after soft merging of the two transmissions in time slot #2, and the blind detection count occupies the maximum number of blind detections in time slot #2.

[0188] In the second and third blind detection methods mentioned above, the terminal can perform individual blind detection on the candidate PDCCH of the previous few transmissions (e.g., time slot #1 during two repeated transmissions), thereby reducing the latency of the terminal's physical downlink shared channel (PDSCH) decoding during this period and reducing the blind detection buffer pressure of the terminal when decoding the PDCCH. In addition, this blind detection method is also compatible with the blind detection method of traditional terminals.

[0189] The fourth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the scenario of repeated PDCCH transmission and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0190] For example, taking the scenario of repeated transmission of PDCCH in two transmissions as an example, as shown in Figure 11, the first transmission of the candidate PDCCH is in time slot #1, and the second transmission is in time slot #2 (the figure shows the system bandwidth occupied by the control resource set where the candidate PDCCH is located and the time slot where the transmission is located). In this case, the fourth blind detection method can be represented as BD count mode = 3BD, that is, the number of blind detection rounds is 3. The fourth blind detection method can be that the terminal performs blind detection on the candidate PDCCH of the first transmission in time slot #1, and the blind detection count occupies the maximum number of blind detections in time slot #1. The terminal performs blind detection on the candidate PDCCH of the second transmission in time slot #2, and at the same time, it also performs blind detection on the candidate PDCCH after soft merging of the two transmissions in time slot #2. The blind detection count for the candidate PDCCH of the second transmission and the blind detection count for the candidate PDCCH after soft merging both occupy the maximum number of blind detections in time slot #2.

[0191] The fourth blind detection method mentioned above is less complicated than the current blind detection method. It only requires adjusting the CSS type used, such as adding support for Type0, Type0A, Type1, and Type2.

[0192] Based on the above technical solutions, the embodiments of this application can configure the blind detection method under inter-slot repetition, select the appropriate blind detection method according to actual needs, realize the alignment of the blind detection methods of candidate PDCCH in the scenario of repeated PDCCH transmission between the terminal and the network device, thereby ensuring the flexibility of the network device in configuring control channel resources, while taking into account that the terminal's blind detection capability meets the relevant regulations.

[0193] Scenario 2: The PDCCH retransmission scenario involves retransmission within a time slot. The target blind detection method is one of the following:

[0194] The fifth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the time slots where the PDCCHs are transmitted in the repeated transmission scenario.

[0195] For example, the maximum number of blind detections can still be at the time slot granularity, meaning only one maximum number of blind detections is configured. Taking the scenario of repeated transmission of a PDCCH in two transmissions as an example, the first and second transmissions of the candidate PDCCH are both transmitted within the same time slot. This fifth blind detection method can be represented as BD count mode = 1BD or 2BD or 3BD, and the number of blind detection rounds can be 1, 2, or 3.

[0196] For example, when BD count mode = 1BD, the fifth blind detection mode can be used by the terminal to perform blind detection on the candidate PDCCH after soft merging of the two transmitted candidate PDCCHs in the time slot, and the blind detection count occupies the maximum number of blind detections in the time slot.

[0197] For example, when BD count mode = 2BD, the fifth blind detection method can allow the terminal to perform blind detection on both the first transmitted candidate PDCCH and the second transmitted candidate PDCCH in the time slot, and the blind detection counts of the two blind detections will occupy the maximum number of blind detections in the time slot.

[0198] For example, when BD count mode = 2BD, the fifth blind detection method can be used for the terminal to perform blind detection on the candidate PDCCH of the first transmission and the candidate PDCCH after soft merging of the two transmissions in the time slot, and the blind detection count of the two blind detections will occupy the maximum number of blind detections in the time slot.

[0199] For example, when BD count mode = 3BD, the fifth blind detection method can be used for the terminal to perform blind detection on the candidate PDCCH of the first transmission, the candidate PDCCH of the second transmission, and the candidate PDCCH after soft merging of the two transmissions within the time slot, and the blind detection count of the three blind detections will occupy the maximum number of blind detections in the time slot.

[0200] The sixth blind detection method is based on the maximum number of blind detections corresponding to the span where the last transmission is located in the PDCCH repeated transmission scenario. It performs blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the PDCCH repeated transmission scenario.

[0201] For example, the maximum number of blind checks can be at the span granularity. For instance, the maximum number of blind checks can be expressed as per span(X, Y)BD limit, where the span mode can be configured according to the CSS type. For example, the span mode can be configured as (7, 3).

[0202] For example, taking the scenario of repeated transmission of PDCCH in two transmissions as shown in Figure 12, the first transmission of the candidate PDCCH is in span1, and the second transmission is in span2. In this case, the sixth blind detection method can be represented as BD count mode = 1, that is, the number of blind detection rounds is 1. The sixth blind detection method allows the terminal to perform blind detection only on the candidate PDCCH after soft merging of the two transmissions in span2, and the blind detection count occupies the maximum number of blind detections in span2, for example, 44 times.

[0203] The seventh blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the span in each transmission.

[0204] For example, taking the scenario of repeated transmission of PDCCH in two transmissions as shown in Figure 12, the first transmission of the candidate PDCCH is in span 1, and the second transmission is in span 2. In this case, the seventh blind detection method can be represented as BD count mode = 2, that is, the number of blind detection rounds is 2. The seventh blind detection method can be that the terminal performs blind detection on the candidate PDCCH of the first transmission in span 1, and the blind detection count occupies the maximum number of blind detections in span 1. The terminal performs blind detection on the candidate PDCCH of the second transmission in span 2, and the blind detection count occupies the maximum number of blind detections in span 2.

[0205] The eighth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the span in which the last transmission is located.

[0206] For example, taking the scenario of repeated transmission of PDCCH in two transmissions as shown in Figure 12, the first transmission of the candidate PDCCH is in span1, and the second transmission is in span2. In this case, the eighth blind detection method can be represented as BD count mode = 2, that is, the number of blind detection rounds is 2. The eighth blind detection method can be that the terminal performs blind detection on the candidate PDCCH transmitted in the first transmission in span1, and the blind detection count occupies the maximum number of blind detections in span1. The terminal performs blind detection on the candidate PDCCH after soft merging of the two transmissions in span2, and the blind detection count occupies the maximum number of blind detections in span2.

[0207] The ninth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in each transmission; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the repeated PDCCH transmission scenario and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the span in the last transmission.

[0208] For example, taking the scenario of repeated transmission of PDCCH in two transmissions as shown in Figure 12, the first transmission of the candidate PDCCH is in span 1, and the second transmission is in span 2. In this case, the eighth blind detection method can be represented as BD count mode = 3, that is, the number of blind detection rounds is 3. The ninth blind detection method can be that the terminal performs blind detection on the candidate PDCCH of the first transmission in span 1, and the blind detection count occupies the maximum number of blind detections in span 1. The terminal performs blind detection on the candidate PDCCH of the second transmission in span 2, and also performs blind detection on the candidate PDCCH after soft merging of the two transmissions in span 2. The blind detection count for the candidate PDCCH of the second transmission and the blind detection count for the candidate PDCCH after soft merging both occupy the maximum number of blind detections in span 2.

[0209] The tenth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the span where the PDCCHs are transmitted multiple times in the repeated transmission scenario.

[0210] In the case of repeated PDCCH transmissions, multiple transmissions occur within the same span. For example, taking a repeated PDCCH transmission scenario with two transmissions as shown in Figure 13, both the first and second transmissions of the candidate PDCCH occur within span 1. This tenth blind detection method can be represented as BD count mode = 1, 2, or 3, and the number of blind detection rounds can be 1, 2, or 3.

[0211] For example, when BD count mode=1, the tenth blind detection mode can be used by the terminal to perform blind detection on the candidate PDCCH after soft merging of the two transmitted candidate PDCCHs within the span1, and the blind detection count occupies the maximum number of blind detections in the span1.

[0212] For example, when BD count mode = 2BD, the tenth blind detection mode can allow the terminal to perform blind detection on both the first and second candidate PDCCHs transmitted within the span 1, and the blind detection counts of the two blind detections will both occupy the maximum number of blind detections in the span 1.

[0213] For example, when BD count mode = 2BD, the tenth blind detection mode can allow the terminal to perform blind detection on the candidate PDCCH of the first transmission and the candidate PDCCH after soft merging of the two transmissions within the span 1, and the blind detection count of the two blind detections will occupy the maximum number of blind detections in the span 1.

[0214] For example, when BD count mode = 3BD, the tenth blind detection mode can allow the terminal to perform blind detection on the candidate PDCCH of the first transmission, the candidate PDCCH of the second transmission, and the candidate PDCCH after soft merging of the two transmissions within the span 1, and the blind detection count of the three blind detections will occupy the maximum number of blind detections in the span 1.

[0215] Based on the above technical solutions, the embodiments of this application can configure the blind detection method under repeated time slots, select the appropriate blind detection method according to actual needs, and realize the alignment of the blind detection methods of candidate PDCCH in the scenario of repeated PDCCH transmission between the terminal and the network device. The above solution requires the terminal to have higher blind detection capability, and at the same time can further increase the flexibility of the network device in configuring PDCCH within the time slot.

[0216] The method provided in this application has been described above. In addition, this application also provides a communication device for implementing the functions described in the above method embodiments.

[0217] It is understood that the first and second nodes in the above embodiments, in order to achieve the aforementioned functions, include hardware structures and / or software modules corresponding to the execution of each function, such as communication devices. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0218] This application embodiment can divide the communication device into functional modules according to the above method embodiment. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. The module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0219] Figure 14 shows a schematic diagram of a communication device 140. The communication device 140 includes a processing module 1401 and a transceiver module 1402. This communication device 140 can be used to implement the functions of the aforementioned terminal equipment or network element.

[0220] In some embodiments, the communication device 140 may further include a storage module (not shown in FIG14) for storing program instructions and data.

[0221] In some embodiments, the transceiver module 1402, also referred to as a transceiver unit, is used to implement sending and / or receiving functions. The transceiver module 1402 may consist of a transceiver circuit, a transceiver, a transceiver unit, or a communication interface.

[0222] In some embodiments, the transceiver module 1402 may include a receiving module and a sending module, respectively configured to perform the receiving and sending steps in the above method embodiments, and / or other processes to support the technology described herein; the processing module 1401 may be configured to perform the processing steps in the above method embodiments, and / or other processes to support the technology described herein.

[0223] When the communication device 140 is used to implement the function of the first node:

[0224] The processing module 1401 is used to perform blind detection on candidate PDCCHs in the repeated transmission scenario of physical downlink control channel PDCCH based on the target blind detection method; the candidate PDCCHs are candidate PDCCHs in the search space set other than Type 3.

[0225] In one possible design, the target blind detection method is a pre-configured blind detection method.

[0226] In one possible design, the target blind detection method is a blind detection method that takes effect when the network device enables repeated transmission of PDCCH for search space sets other than Type 3, or the target blind detection method is the default blind detection method among the pre-configured blind detection methods.

[0227] In one possible design, the transceiver module 1402 is used to receive indication information from the second node, which is used to indicate the target blind detection method.

[0228] In one possible design, the indication information is carried in any one of the main information block (MIB), the physical broadcast channel (PBCH), or the system information block (SIB).

[0229] In one possible design, where the indication information is carried in the System Information Block (SIB), the candidate PDCCH is the candidate PDCCH of the search space set excluding Type 0 and Type 0A.

[0230] In one possible design, the indication information is one of multiple candidate values, and one of the candidate values ​​corresponds to a blind detection method.

[0231] In one possible design, the processing module 1401 is used to initiate random access through the transceiver module 1402 based on the random access resources corresponding to the target blind detection method; wherein, the random access resources are resources in multiple random access resource groups; at least one random access resource group in the multiple random access resource groups has a mapping relationship with at least one blind detection method in the repeated transmission scenario of PDCCH, and the target blind detection method is a blind detection method in at least one blind detection method.

[0232] In one possible design, the PDCCH retransmission scenario is inter-slot retransmission; the target blind detection method is one of the following blind detection methods:

[0233] The first blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the PDCCH repeated transmission scenario, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0234] The second blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the time slot of each transmission.

[0235] The third blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0236] The fourth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the scenario of repeated PDCCH transmission and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0237] In one possible design, the PDCCH retransmission scenario is intra-slot retransmission; the target blind detection method is one of the following blind detection methods:

[0238] The fifth blind detection method is used to indicate the maximum number of blind detections corresponding to the time slots where multiple transmissions occur in the scenario of repeated transmission of PDCCH, and to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times.

[0239] The sixth blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time span of the last transmission.

[0240] The seventh blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the span in each transmission.

[0241] The eighth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the span in which the last transmission is located.

[0242] The ninth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in each transmission; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the repeated PDCCH transmission scenario and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the span in the last transmission.

[0243] The tenth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the span in which the multiple transmissions of PDCCHs are located in the repeated transmission scenario; the multiple transmissions in the repeated transmission scenario of PDCCHs are transmissions within the same span.

[0244] When the communication device 140 is the second node, that is, when the communication device 140 is used to implement the function of the second node:

[0245] The transceiver module 1402 is used to send indication information; the indication information is used to indicate the target blind detection method of the candidate PDCCH transmitted in the scenario of repeated transmission of physical downlink control channel PDCCH; the candidate PDCCH is the candidate PDCCH of the search space set other than Type 3.

[0246] In one possible design, the indication information is carried in any one of the main information block (MIB), the physical broadcast channel (PBCH), or the system information block (SIB).

[0247] In one possible design, where the indication information is carried in the System Information Block (SIB), the candidate PDCCH is the candidate PDCCH of the search space set excluding Type 0 and Type 0A.

[0248] In one possible design, the indication information is one of multiple candidate values, and one of the candidate values ​​corresponds to a blind detection method.

[0249] In one possible design, at least one blind detection method in the repeated transmission scenario of PDCCH has a mapping relationship with at least one random access resource group among multiple random access resource groups, and the target blind detection method is the blind detection method among at least one blind detection method.

[0250] In one possible design, the PDCCH retransmission scenario is inter-slot retransmission; the target blind detection method is one of the following blind detection methods:

[0251] The first blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the PDCCH repeated transmission scenario, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0252] The second blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the time slot of each transmission.

[0253] The third blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0254] The fourth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the scenario of repeated PDCCH transmission and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

[0255] In one possible design, the PDCCH retransmission scenario is intra-slot retransmission; the target blind detection method is one of the following blind detection methods:

[0256] The fifth blind detection method is used to indicate the maximum number of blind detections corresponding to the time slots where multiple transmissions occur in the scenario of repeated transmission of PDCCH, and to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times.

[0257] The sixth blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the time span of the last transmission.

[0258] The seventh blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmission scenarios of PDCCH, based on the maximum number of blind detections corresponding to the span in each transmission.

[0259] The eighth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH after multiple transmissions in the scenario of repeated PDCCH transmission based on the maximum number of blind detections corresponding to the span in which the last transmission is located.

[0260] The ninth blind detection method is to perform blind detection on the candidate PDCCH for each transmission in at least one transmission except the last transmission in the scenario of repeated PDCCH transmission, based on the maximum number of blind detections corresponding to the span in each transmission; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCH in the repeated PDCCH transmission scenario and the candidate PDCCH in the last transmission, based on the maximum number of blind detections corresponding to the span in the last transmission.

[0261] The tenth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the span in which the multiple transmissions of PDCCHs are located in the repeated transmission scenario; the multiple transmissions in the repeated transmission scenario of PDCCHs are transmissions within the same span.

[0262] All relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0263] In this application, the communication device 140 can be presented in an integrated manner by dividing it into various functional modules. Here, "module" can refer to an application-specific integrated circuit (ASIC), a circuit, a processor and memory that executes one or more software or firmware programs, integrated logic circuits, and / or other devices that can provide the above functions.

[0264] In some embodiments, when the communication device 140 in FIG14 is a chip or chip system, the function / implementation process of the transceiver module 1402 can be implemented through the input / output interface (or communication interface) of the chip or chip system, and the function / implementation process of the processing module 1401 can be implemented through the processor (or processing circuit) of the chip or chip system.

[0265] Since the communication device 140 provided in this embodiment can execute the above method, the technical effects it can achieve can be referred to the above method embodiment, and will not be repeated here.

[0266] As a possible product form, the first node and the second node described in the embodiments of this application can be implemented using the following: one or more field programmable gate arrays (FPGAs), programmable logic devices (PLDs), controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits capable of performing the various functions described throughout this application.

[0267] As another possible product form, the first node and second node described in this application embodiment can be implemented using a general bus architecture. For ease of explanation, refer to Figure 15, which is a schematic diagram of the communication device 1500 provided in this application embodiment. The communication device 1500 includes a processor 1501 and a transceiver 1502. The communication device 1500 can be a first node, a second node, or a chip or chip system thereof. Figure 15 only shows the main components of the communication device 1500. In addition to the processor 1501 and transceiver 1502, the communication device may further include a memory 1503 and input / output devices (not shown in Figure 15).

[0268] Optionally, the processor 1501 is mainly used to process communication protocols and communication data, control the entire communication device, execute software programs, and process the data of the software programs, thereby implementing the methods provided in the above-described method embodiments. The memory 1503 is mainly used to store software programs and data. The transceiver 1502 may include radio frequency (RF) circuitry and an antenna. The RF circuitry is mainly used for converting baseband signals to RF signals and processing RF signals. The antenna is mainly used for transmitting and receiving RF signals in the form of electromagnetic waves. Input / output devices, such as touchscreens, displays, and keyboards, are mainly used to receive user input data and output data to the user.

[0269] Optionally, the processor 1501, transceiver 1502, and memory 1503 can be connected via a communication bus.

[0270] When the communication device is powered on, the processor 1501 can read the software program in the memory 1503, execute the instructions of the software program, and process the data of the software program. When data needs to be transmitted wirelessly, the processor 1501 performs baseband processing on the data to be transmitted and outputs the baseband signal to the radio frequency (RF) circuit. The RF circuit processes the baseband signal and transmits the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor 1501. The processor 1501 converts the baseband signal into data and processes the data.

[0271] In another implementation, the radio frequency circuitry and antenna can be set up independently of the processor performing baseband processing. For example, in a distributed scenario, the radio frequency circuitry and antenna can be arranged remotely, independent of the communication device.

[0272] In some embodiments, those skilled in the art will recognize that the above-described communication device 140 can be implemented in the form of the communication device 1500 shown in FIG15.

[0273] As an example, the function / implementation of the processing module 1401 in Figure 14 can be achieved by the processor 1501 in the communication device 1500 shown in Figure 15 calling computer execution instructions stored in the memory 1503. The function / implementation of the transceiver module 1402 in Figure 14 can be achieved by the transceiver 1502 in the communication device 1500 shown in Figure 15.

[0274] As another possible product form, the first node and the second node in this application can adopt the composition structure shown in FIG16, or include the components shown in FIG16. FIG16 is a schematic diagram of the composition of a communication device 1600 provided in this application. The communication device 1600 can be a first node, a second node, or a chip or system-on-a-chip in the first node and the second node.

[0275] As shown in Figure 16, the communication device 1600 includes at least one processor 1601 and at least one communication interface (Figure 16 is merely an example illustrating the inclusion of a communication interface 1604 and a processor 1601). Optionally, the communication device 1600 may also include a communication bus 1602 and a memory 1603.

[0276] Processor 1601 can be a general-purpose central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a PLD, or any combination thereof. Processor 1601 can also be other devices with processing functions, such as circuits, devices, or software modules, without limitation.

[0277] Communication bus 1602 is used to connect different components in communication device 1600, enabling communication between them. Communication bus 1602 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used in Figure 16, but this does not indicate that there is only one bus or one type of bus.

[0278] Communication interface 1604 is used for communicating with other devices or communication networks. For example, communication interface 1604 can be a module, circuit, transceiver, or any device capable of communication. Optionally, communication interface 1604 can also be an input / output interface located within processor 1601, used to implement signal input and signal output for the processor.

[0279] The memory 1603 may be a device with storage function, used to store instructions and / or data. The instructions may be computer programs.

[0280] For example, the memory 1603 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and / or instructions; it may also be a random access memory (RAM) or other type of dynamic storage device capable of storing information and / or instructions; it may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0281] It should be noted that the memory 1603 can exist independently of the processor 1601, or it can be integrated with the processor 1601. The memory 1603 can be located inside or outside the communication device 1600, without limitation. The processor 1601 can be used to execute the instructions stored in the memory 1603 to implement the methods provided in the following embodiments of this application.

[0282] Optionally, the processor 1601 and / or memory 1603 may include an artificial intelligence (AI) module, which is used to implement AI-related functions. The AI ​​module can be implemented through software, hardware, or a combination of both. For example, the AI ​​module may include a radio network intelligent controller (RIC) module. For example, the AI ​​module can be a near real-time RIC or a non-real-time RIC.

[0283] As an optional implementation, the communication device 1600 may also include an output device 1605 and an input device 1606. The output device 1605 communicates with the processor 1601 and can display information in various ways. For example, the output device 1605 may be a liquid crystal display (LCD), a light-emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc. The input device 1606 communicates with the processor 1601 and can receive user input in various ways. For example, the input device 1606 may be a mouse, keyboard, touchscreen device, or sensing device, etc.

[0284] In some embodiments, those skilled in the art will recognize that the communication device 140 shown in FIG14 can take the form of the communication device 1600 shown in FIG16 in terms of hardware implementation.

[0285] As an example, the function / implementation process of the processing module 1401 in Figure 14 can be implemented by the processor 1601 in the communication device 1600 shown in Figure 16 calling computer execution instructions stored in the memory 1603. The function / implementation process of the transceiver module 1402 in Figure 14 can be implemented by the communication interface 1604 in the communication device 1600 shown in Figure 16.

[0286] The structure shown in Figure 16 does not constitute a specific limitation on the first node and the second node. For example, in other embodiments of this application, the first node and the second node may include more or fewer components than shown in the figure, or combine some components, or split some components, or have different component arrangements. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0287] In some embodiments, this application also provides a communication device, which includes a processor for implementing the methods in any of the above method embodiments.

[0288] As one possible implementation, the communication device also includes a memory. This memory stores necessary computer programs and data. The computer program may include instructions, which a processor can invoke to instruct the communication device to execute the methods described in any of the above method embodiments. Alternatively, the memory may not be present in the communication device.

[0289] As another possible implementation, the communication device also includes an interface circuit, which is a code / data read / write interface circuit, used to receive computer execution instructions (which are stored in memory and may be read directly from memory or may be transmitted through other devices) and transmit them to the processor.

[0290] As another possible implementation, the communication device also includes a communication interface for communicating with modules outside the communication device.

[0291] It is understood that the communication device can be a chip or a chip system. When the communication device is a chip system, it can be composed of chips or may include chips and other discrete devices. This application does not specifically limit this.

[0292] This application also provides a computer-readable storage medium having a computer program or instructions stored thereon, which, when executed by a computer, implements the functions of any of the above-described method embodiments.

[0293] This application also provides a computer program product that, when executed by a computer, implements the functions of any of the above method embodiments.

[0294] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0295] It is understood that the systems, apparatuses, and methods described in this application can also be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0296] The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. The components shown as units may or may not be physical units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0297] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0298] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software programs, implementation can be, in whole or in part, in the form of a computer program product. This computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device containing one or more servers, data centers, etc., that can be integrated with the medium. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive (SSD)). In embodiments of this application, the computer may include the aforementioned apparatus.

[0299] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, disclosure, and appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0300] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the scope of this application. Accordingly, this specification and drawings are merely illustrative descriptions of the application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of the claims and their equivalents, this application is also intended to include such modifications and modifications.

Claims

1. A communication method, characterized in that, Applied to the first node, the method includes: Based on the target blind detection method, blind detection is performed on the candidate PDCCH in the repeated transmission scenario of the physical downlink control channel PDCCH; the candidate PDCCH is the candidate PDCCH of the search space set other than Type 3.

2. The method according to claim 1, characterized in that, The target blind detection method is a pre-configured blind detection method.

3. The method according to claim 2, characterized in that, The target blind detection method is a blind detection method that takes effect when the network device enables repeated transmission of PDCCH in the search space set other than Type 3, or the target blind detection method is the default blind detection method among the pre-configured blind detection methods.

4. The method according to any one of claims 1-3, characterized in that, The method further includes: The system receives indication information from a second node, which is used to indicate the target blind detection method; wherein the indication information is carried in any one of the main information block (MIB), physical broadcast channel (PBCH), or system information block (SIB).

5. The method according to claim 4, characterized in that, When the indication information is carried in the system information block (SIB), the candidate PDCCH is the candidate PDCCH of the search space set other than Type 0 and Type 0A.

6. The method according to claim 4, characterized in that, The indication information is one of a plurality of candidate values, and one of the candidate values ​​corresponds to a blind detection method.

7. The method according to any one of claims 1-3, characterized in that, The method further includes: Random access is initiated based on the random access resources corresponding to the target blind detection method; wherein, the random access resources are resources in multiple random access resource groups; at least one random access resource group in the multiple random access resource groups has a mapping relationship with at least one blind detection method in the repeated transmission scenario of the PDCCH, and the target blind detection method is the blind detection method in the at least one blind detection method.

8. The method according to any one of claims 1-7, characterized in that, The repeated transmission scenario of the PDCCH is inter-slot repeated transmission; the target blind detection method is one of the following blind detection methods: The first blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the repeated transmission scenario based on the maximum number of blind detections corresponding to the time slot where the last transmission of the PDCCH is located. The second blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmissions in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the time slot where each transmission is located. The third blind detection method is to perform blind detection on the candidate PDCCH of each transmission in at least one transmission except the last transmission in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCHs transmitted multiple times in the repeated transmission scenario of the PDCCH based on the maximum number of blind detections corresponding to the time slot where the last transmission is located. The fourth blind detection method is to perform blind detection on the candidate PDCCH of each transmission in at least one transmission except the last transmission in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCHs transmitted multiple times in the repeated transmission scenario of the PDCCH and the candidate PDCCH of the last transmission based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

9. The method according to any one of claims 1-7, characterized in that, The repeated transmission scenario of the PDCCH is repeated transmission within a time slot; the target blind detection method is one of the following blind detection methods: The fifth blind detection method is used to indicate that, based on the maximum number of blind detections corresponding to the time slots where the PDCCH is transmitted multiple times in the repeated transmission scenario, at least one of the candidate PDCCHs transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs transmitted multiple times is blindly detected. The sixth blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the repeated transmission scenario of the PDCCH based on the maximum number of blind detections corresponding to the time span of the last transmission in the repeated transmission scenario of the PDCCH. The seventh blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmissions in the scenario of repeated transmission of the PDCCH, based on the maximum number of blind detections corresponding to the span in which each transmission is located. The eighth blind detection method is to perform blind detection on the candidate PDCCH of each transmission in at least one transmission except the last transmission in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCHs transmitted multiple times in the repeated transmission scenario of the PDCCH based on the maximum number of blind detections corresponding to the span in which the last transmission is located. The ninth blind detection method is to perform blind detection on the candidate PDCCH of each transmission in at least one transmission except the last transmission in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCHs transmitted multiple times in the repeated transmission scenario of the PDCCH and the candidate PDCCH of the last transmission based on the maximum number of blind detections corresponding to the span in which the last transmission is located. The tenth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the span in which the multiple transmissions of the PDCCH are located under the repeated transmission scenario; the multiple transmissions under the repeated transmission scenario of the PDCCH are transmissions within the same span.

10. A communication method, characterized in that, Applied to the second node, the method includes: Send indication information; the indication information is used to indicate the target blind detection method of candidate PDCCH transmitted in the scenario of repeated transmission of physical downlink control channel PDCCH; the candidate PDCCH is the candidate PDCCH of the search space set other than type Type3.

11. The method according to claim 10, characterized in that, The indication information is carried in any one of the main information block (MIB), physical broadcast channel (PBCH), or system information block (SIB).

12. The method according to claim 11, characterized in that, When the indication information is carried in the system information block (SIB), the candidate PDCCH is the candidate PDCCH of the search space set other than Type 0 and Type 0A.

13. The method according to claim 12, characterized in that, The indication information is one of a plurality of candidate values, and one of the candidate values ​​corresponds to a blind detection method.

14. The method according to any one of claims 10-13, characterized in that, In the scenario of repeated transmission of the PDCCH, at least one blind detection method has a mapping relationship with at least one random access resource group among multiple random access resource groups, and the target blind detection method is the blind detection method among the at least one blind detection method.

15. The method according to any one of claims 10-14, characterized in that, The repeated transmission scenario of the PDCCH is inter-slot repeated transmission; the target blind detection method is one of the following blind detection methods: The first blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the repeated transmission scenario based on the maximum number of blind detections corresponding to the time slot where the last transmission of the PDCCH is located. The second blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmissions in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the time slot where each transmission is located. The third blind detection method is to perform blind detection on the candidate PDCCH of each transmission in at least one transmission except the last transmission in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCHs transmitted multiple times in the repeated transmission scenario of the PDCCH based on the maximum number of blind detections corresponding to the time slot where the last transmission is located. The fourth blind detection method is to perform blind detection on the candidate PDCCH of each transmission in at least one transmission except the last transmission in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the time slot where each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCHs transmitted multiple times in the repeated transmission scenario of the PDCCH and the candidate PDCCH of the last transmission based on the maximum number of blind detections corresponding to the time slot where the last transmission is located.

16. The method according to any one of claims 10-14, characterized in that, The repeated transmission scenario of the PDCCH is repeated transmission within a time slot; the target blind detection method is one of the following blind detection methods: The fifth blind detection method is used to indicate that, based on the maximum number of blind detections corresponding to the time slots where the PDCCH is transmitted multiple times in the repeated transmission scenario, at least one of the candidate PDCCHs transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs transmitted multiple times is blindly detected. The sixth blind detection method is to perform blind detection on the candidate PDCCH after soft merging of multiple candidate PDCCHs in the repeated transmission scenario of the PDCCH based on the maximum number of blind detections corresponding to the time span of the last transmission in the repeated transmission scenario of the PDCCH. The seventh blind detection method is to perform blind detection on the candidate PDCCH for each transmission in the multiple transmissions in the scenario of repeated transmission of the PDCCH, based on the maximum number of blind detections corresponding to the span in which each transmission is located. The eighth blind detection method is to perform blind detection on the candidate PDCCH of each transmission in at least one transmission except the last transmission in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCHs transmitted multiple times in the repeated transmission scenario of the PDCCH based on the maximum number of blind detections corresponding to the span in which the last transmission is located. The ninth blind detection method is to perform blind detection on the candidate PDCCH of each transmission in at least one transmission except the last transmission in the repeated transmission scenario of the PDCCH, based on the maximum number of blind detections corresponding to the span in which each transmission is located; and for the last transmission, to perform blind detection on the candidate PDCCH after soft merging of the candidate PDCCHs transmitted multiple times in the repeated transmission scenario of the PDCCH and the candidate PDCCH of the last transmission based on the maximum number of blind detections corresponding to the span in which the last transmission is located. The tenth blind detection method is to perform blind detection on at least one of the candidate PDCCHs that have been transmitted multiple times and the candidate PDCCHs after soft merging of the candidate PDCCHs that have been transmitted multiple times, based on the maximum number of blind detections corresponding to the span in which the multiple transmissions of the PDCCH are located under the repeated transmission scenario; the multiple transmissions under the repeated transmission scenario of the PDCCH are transmissions within the same span.

17. A communication device, characterized in that, include: A functional unit for performing the method as described in any one of claims 1-9, or a functional unit for performing the method as described in any one of claims 10-16; wherein the action performed by the functional unit is implemented by hardware or by hardware executing corresponding software.

18. A communication device, characterized in that, The communication device includes a processor; the processor is configured to run a computer program or instructions to cause the communication device to perform the method as described in any one of claims 1-9, or to perform the method as described in any one of claims 10-16.

19. A computer-readable storage medium, characterized in that, A computer-readable storage medium stores computer instructions or programs that, when executed on a computer, cause the method as described in any one of claims 1-9 or the method as described in any one of claims 10-16 to be performed.

20. A computer program product, characterized in that, The computer program product includes computer instructions; when some or all of the computer instructions are run on a computer, they cause the method as described in any one of claims 1-9 or the method as described in any one of claims 10-16 to be performed.

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