Communication method, electronic device, apparatus, medium, and program product

Abstract

The present application provides a communication method, an electronic device, an apparatus, a medium, and a program product. The method comprises: on the basis of a system frame number of a first system frame, determining a start frame number corresponding to at least one basic unit in search space #0, wherein the first system frame is used for transmitting a synchronization signal block (SSB), and the basic unit comprises at least two adjacent system frames.

Description

Communication method, electronic device, apparatus, medium and program product

[0001] This application claims priority to the Chinese patent application No. 202411396156.6, filed on September 30, 2024, and entitled "Communication method, electronic device, apparatus, medium and program product", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication, and in particular to a communication method, an electronic device, an apparatus, a medium and a program product. BACKGROUND

[0003] A non terrestrial network (NTN) communication system refers to a communication network using satellites or high-altitude platforms, but due to different times, different regions, and different service requirements of users, there are unbalanced distribution characteristics, for example, in sparsely populated areas, the number of users is small, and the service requirement of users is low, while in densely populated areas, the number of users is large, and the service requirement of users is low. Therefore, a beam hopping (BH) satellite communication system is used to solve the problem of uneven distribution characteristics of the NTN network. In the beam hopping satellite communication system, the network device sends beams in different directions at multiple times, thereby covering the entire cell, wherein each beam needs to be configured with a synchronization signal / PBCH (SSB), and in the process of cell search and synchronization, a terminal device (UE) maintains time and frequency synchronization with the cell by acquiring the SSB.

[0004] In related technologies, after the UE acquires the SSB, the UE determines a search space 0 (SS#0) according to the SSB, the SS#0 is used to carry a physical downlink control channel (PDCCH) corresponding to a system information block 1 (SIB1), and after acquiring the SIB1 through the SS#0, the UE can complete cell access through the SIB1. Since a single satellite needs to serve thousands of beams, in order to save the overhead of the SSB, the transmission period of the SSB needs to be extended, and therefore, how to determine the position of the search space 0 corresponding to the SSB according to the position of the SSB after the SSB is extended is a problem to be solved. SUMMARY

[0005] The present application provides a communication method and an apparatus, which can save the overhead of the SSB and improve coverage.

[0006] In a first aspect, a communication method is provided, applied to a terminal device, and the method comprises: determining a starting system frame number corresponding to at least one basic unit in search space 0 based on a system frame number of a first system frame, the first system frame being used to transmit a synchronization signal block (SSB), wherein the basic unit comprises at least two adjacent system frames.

[0007] In the technical solution of the present application, by enhancing the search space 0, the enhanced search space 0 contains at least two adjacent system frames as a single basic unit, and the starting system frame number corresponding to the basic unit in the enhanced search space 0 is determined according to the system frame number corresponding to the SSB, that is, after the search space 0 is enhanced, the relative position in the original system frame is not changed, and the starting system frame number corresponding to the search space 0 is obtained by the system frame number corresponding to the SSB, so that the search space 0 can be accurately determined after the SSB is extended, and the transmission quality of the downlink is improved.

[0008] It should be understood that the system frame (system frame) is also referred to as a radio frame, or simply a frame, and the duration is 10 milliseconds (ms). The first system frame refers to the system frame in which the SSB is located.

[0009] The SSB is transmitted periodically in multiple different system frames.

[0010] Illustratively, the search space 0 contains multiple basic units, each of which is composed of at least two adjacent system frames, wherein when two system frames are contained, there are even system frames and odd system frames.

[0011] It should be understood that the starting system frame number corresponding to the basic unit in the search space 0 refers to the frame number corresponding to the system frame to which the starting position of the basic unit belongs.

[0012] It should be understood that the starting system frame number corresponding to the basic unit in the search space 0 is relative to the SSB, that is, if the SSB index value (SSB index) is different, the starting system frame number corresponding to the basic unit in the search space 0 may be the same (for example, multiple SSBs share the same basic unit in the same search space 0) or different.

[0013] In combination with the first aspect, in some implementations of the first aspect, the method further comprises: determining an i-th starting system frame number corresponding to an i-th basic unit in the search space 0 based on the system frame number of the first system frame, i being 0 or a positive integer.

[0014] It should be understood that the starting frame number corresponding to the i-th basic unit in the search space 0 is determined by the frame number of the SSB system frame, the search space 0 can be determined in the case of extending the SSB cycle, and the coverage is improved while saving the SSB overhead.

[0015] In combination with the first aspect, in some implementations of the first aspect, the method further includes: obtaining a related parameter corresponding to the system frame number; determining the i-th starting frame number based on the system frame number and the related parameter; and wherein the related parameter includes at least one of the following: a density value of the search space 0 relative to the first system frame; a cycle parameter of the SSB; and a system frame offset.

[0016] By the above method, different related parameters are used to determine the starting frame number corresponding to the basic unit in the search space 0, and the search space 0 can be more flexibly configured.

[0017] In combination with the first aspect, in some implementations of the first aspect, the search space 0 includes a plurality of basic units, the i-th starting frame number includes a first starting frame number, the first starting frame number corresponds to a first basic unit, the plurality of basic units include a j-th basic unit, j≥1 and j is an integer; the method further includes: obtaining a system frame interval value corresponding to the j-th basic unit, the system frame interval value is determined by a starting frame corresponding to the j-th basic unit and a starting frame corresponding to the first basic unit, the starting frame is a system frame at a starting position in the basic unit, and the adjacent system frame interval value≥2; and determining the starting frame number corresponding to the j-th basic unit based on the first starting frame number and the system frame interval value.

[0018] It should be understood that the system frame interval value refers to the interval value of the starting frames in any two basic units, and the adjacent system frame interval value refers to the interval value of the starting frames in adjacent two basic units.

[0019] By the above method, when the starting frame number corresponding to the first basic unit is determined, the starting frame numbers corresponding to other basic units are calculated based on the system frame interval value, and the configuration flexibility of the search space 0 is improved.

[0020] In combination with the first aspect, in some implementations of the first aspect, the search space 0 corresponds to a plurality of physical downlink control channel detection occasions (PMO); and the method further includes: detecting a physical downlink control channel (PDCCH) corresponding to a system information block (SIB1) in at least one PMO through the search space 0.

[0021] By the above method, after the search space 0 is determined, the SIB1 PDCCH is detected in at least one PMO, and the cell access probability is improved.

[0022] With reference to the first aspect, in some implementations of the first aspect, the method further includes receiving the first information, the first information including at least one of a transmission mode or a number of repeated transmissions, the transmission mode referring to a pattern of PMOs available for transmitting the PDCCH, and the number of repeated transmissions referring to a number of times the PDCCH transmits the same DCI.

[0023] With the above method, when the transmission mode or the number of repeated transmissions is informed, the terminal device no longer performs PDCCH blind detection, thereby saving data communication overhead.

[0024] With reference to the first aspect, in some implementations of the first aspect, the plurality of PMOs each correspond to a number; and the pattern includes at least one of: the numbers corresponding to the plurality of PMOs being arranged in continuous increments; the numbers corresponding to the plurality of PMOs being arranged in increments according to a first preset interval; or the numbers corresponding to the plurality of PMOs being arranged in increments, wherein a second preset interval between numbers corresponding to at least two adjacent PMOs is different.

[0025] With the above method, the arrangement of the numbers of the different PMOs can meet different PDCCH detection requirements.

[0026] With reference to the first aspect, in some implementations of the first aspect, the plurality of PMOs each correspond to a number, and the plurality of PMOs include a first PMO, the first PMO being used for initial transmission of the PDCCH; and the method further includes determining the first PMO based on the number of times the PDCCH transmits the DCI, or taking a PMO at a first position in the plurality of PMOs as the first PMO.

[0027] With the above method, the manner of determining the first PMO can determine the timing of transmitting the DCI information of the PDCCH, thereby further improving PDCCH detection efficiency.

[0028] With reference to the first aspect, in some implementations of the first aspect, the method further includes taking an mth PMO as the first PMO when a modulo operation result between a number corresponding to the mth PMO and the number of times of transmission is zero, m being 0 or a positive integer.

[0029] The second aspect provides a communication method applied to a network device, the method including: determining a starting frame number corresponding to at least one basic unit in a search space 0 based on a system frame number of a first system frame, the first system frame being used for transmitting an SSB, wherein the basic unit includes at least two adjacent system frames.

[0030] It should be understood that the technical effects of the technical solutions of the second aspect can be referred to the related descriptions of the first aspect, and will not be repeated.

[0031] With reference to the second aspect, in some implementations of the second aspect, the method further includes: obtaining a related parameter corresponding to the system frame number; and determining the i-th starting frame number based on the system frame number and the related parameter, wherein the related parameter includes at least one of: a density value of the search space 0 relative to the first system frame; a periodicity parameter of the SSB; and a system frame offset.

[0032] With reference to the second aspect, in some implementations of the second aspect, the search space 0 includes a plurality of basic units, the i-th starting frame number includes a first starting frame number, the first starting frame number corresponds to a first basic unit, the plurality of basic units include a j-th basic unit, j is an integer and j is greater than or equal to 1; the method further includes: obtaining a system frame interval value corresponding to the j-th basic unit, the system frame interval value being determined by a starting frame corresponding to the j-th basic unit and a starting frame corresponding to the first basic unit, the starting frame being a system frame at a starting position of a basic unit, and adjacent system frame interval values being greater than or equal to 2; and determining a starting frame number corresponding to the j-th basic unit based on the first starting frame number and the system frame interval value.

[0033] With reference to the second aspect, in some implementations of the second aspect, the search space 0 corresponds to a plurality of physical downlink control channel detection occasions (PMOs); and the method further includes: transmitting, to the terminal device, a PDCCH corresponding to the SIB1 on at least one PMO of the search space 0, the PDCCH corresponding to the SIB1 being a PDCCH scheduling a PDSCH carrying the SIB1.

[0034] With reference to the second aspect, in some implementations of the second aspect, the method further includes: transmitting, to the terminal device, first information, the first information including at least one of a transmission mode or a repetition transmission number, the transmission mode being a pattern of PMOs available for transmitting the PDCCH, and the repetition transmission number being a number of times of transmitting the PDCCH with the same downlink control information (DCI).

[0035] With reference to the second aspect, in some implementations of the second aspect, the plurality of PMOs respectively correspond to numbers; and the pattern includes at least one of: the numbers corresponding to the plurality of PMOs being arranged in a continuous increasing manner; the numbers corresponding to the plurality of PMOs being arranged in an increasing manner with a first preset interval; or the numbers corresponding to the plurality of PMOs being arranged in an increasing manner, wherein a second preset interval between numbers corresponding to at least two groups of adjacent PMOs is different.

[0036] With reference to the second aspect, in some implementations of the second aspect, the plurality of PMOs respectively correspond to numbers, and the plurality of PMOs include a first PMO, the first PMO being used for initially transmitting the PDCCH; and the method further includes: determining the first PMO based on a transmission number of the PDCCH transmitting the DCI; or taking a PMO at a first position in the plurality of PMOs as the first PMO.

[0037] With reference to the second aspect, in some implementations of the second aspect, the method further includes: in a case where a modulo operation result of a number corresponding to the mth PMO and the number of transmissions is zero, taking the mth PMO as the first PMO, m being 0 or a positive integer.

[0038] A third aspect provides a communication apparatus, including a unit composed of software and / or hardware, configured to perform any of the methods in the first aspect or the second aspect.

[0039] A fourth aspect provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the computer program can implement any of the methods in the first aspect or the second aspect.

[0040] Optionally, when the electronic device is used to implement any of the methods in the first aspect, the electronic device can be a terminal device, and when the electronic device is used to implement any of the methods in the second aspect, the electronic device can be a network device.

[0041] A fifth aspect provides a chip, including a processor configured to read and execute a computer program stored in a memory, and when the computer program is executed by the processor, the computer program can implement any of the methods in the first aspect or the second aspect.

[0042] Optionally, the chip further includes the memory, and the memory is electrically connected to the processor.

[0043] Optionally, the chip can further include a communication interface.

[0044] A sixth aspect provides a computer readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program can implement any of the methods in the first aspect or the second aspect.

[0045] A seventh aspect provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the computer program can implement any of the methods in the first aspect or the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0046] FIG. 1 is a schematic diagram of a satellite communication system according to an embodiment of the present application.

[0047] FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.

[0048] FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application.

[0049] FIG. 4 is a schematic diagram of a PDCCH retransmission number according to an embodiment of the present application.

[0050] FIG. 5 is a schematic diagram of a PDCCH retransmission number according to an embodiment of the present application.

[0051] FIG. 6 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0052] The scheme of the embodiments of the present application will be described below with reference to the drawings. The communication method provided by the present application can be applied to various wireless communication systems.

[0053] First, some technical knowledge related to the present application will be introduced and described:

[0054] NTN technology;

[0055] The NTN technology provides communication services to ground users through NTN satellites (or unmanned aerial vehicles) instead of ground base stations. The NTN communication system includes at least one of the following: a satellite communication system, a high-altitude platform communication system (for example, an aircraft-based communication system, a hot air balloon-based communication system). Among these systems, the satellite communication system is a typical working scenario.

[0056] FIG. 1 shows a schematic diagram of a satellite communication system 100 provided by an exemplary embodiment of the present application, which includes a terminal device 110, a satellite 120, a gateway 130, a ground base station 140, and a core network 150. The satellite 120 establishes an air interface link with the ground base station 140 through the gateway 130, and the satellite 120 can forward the signal of the ground base station 140 to implement coverage of areas where the signal of the ground base station 140 cannot be covered. In these areas, the terminal device 110 can communicate with the corresponding satellite 120, and especially for remote areas, deserts, mountains, oceans, and other areas where the signal of the ground base station 140 cannot be covered, the satellite 120 can effectively cover them. In the embodiments of the present application, the NTN satellite is referred to as a satellite, and the satellite 120 is the NTN satellite 120.

[0057] The terminal device 110 involved in the embodiments of the present application can include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, and various forms of UEs, mobile stations (MS), terminal devices, Internet of Things devices, etc. The terminal device 110 can be at least one of a mobile phone, a tablet computer, an electronic book reader, a laptop computer, a desktop computer, a television, a game console, an augmented reality (AR) terminal, a virtual reality (VR) terminal, a mixed reality (MR) terminal, a wearable device, a handle, an electronic tag, a controller, etc. For ease of description, the devices mentioned above are collectively referred to as terminal devices 110 in the embodiments of the present application. In the embodiments of the present application, UE is used to represent the terminal device in some places, and the network device can be a base station or a satellite.

[0058] Taking a cellular communication network as an example, the ground base station 140 is a device used to provide wireless communication functions for the terminal device 110. The ground base station 140 can include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with base station functions can be different, for example, in a 5th Generation New Radio (5G NR) communication system, it is called a Next Generation Node B (gNB). With the evolution of communication technology, the name of “base station” can change. For ease of description, the devices described above that provide wireless communication functions for the terminal device 110 are collectively referred to as base stations in the embodiments of the present application.

[0059] In the embodiments of the present application, the nouns “network” and “system” are often used interchangeably, but those skilled in the art can understand their meanings. The technical solutions described in the embodiments of the present application can be applicable to a Long Term Evolution (LTE) system, a 5G system, a 5G NR system, a subsequent evolution system of the 5G NR system or other communication systems, and the embodiments of the present application do not limit this.

[0060] In the related art, for an NTN communication system, the services of NTN users present extremely uneven distribution characteristics at different times and in different areas. For example, in sparsely populated areas such as oceans and deserts, the number of users is small, and the service demand of users is low. For densely populated areas such as cities, the number of users is large, and the service demand of users is high. For another example, for the same area, the service demand of users is high during the day, and the service demand of users is low at night. In order to alleviate the contradiction between small satellite payload and wide coverage, and to improve the efficiency of satellite system resources, a hop-beam satellite system is adopted, in which a single satellite can support thousands of beams, but only a small number of beams (for example, dozens of beams) are activated at a time, and the satellite serves all coverage areas in time by time division multiplexing of beams.

[0061] In the NTN communication system scenario, the base station transmits beams in different directions at multiple times to cover the entire cell, wherein each beam needs to be configured with an SSB. The UE can achieve time and frequency synchronization with the cell by acquiring the SSB.

[0062] For search space 0, it is used to carry specific control channels, such as downlink control information (DCI) of a physical downlink control channel (PDCCH). In the initial access process of the cell, search space 0 is particularly used to carry the PDCCH corresponding to the PDSCH of SIB1. The PDCCH corresponding to the PDSCH carrying SIB1 can be referred to as SIB1 PDCCH. The UE needs to acquire SIB1 first after accessing the network, and SIB1 contains basic configuration parameters of the network, such as configuration of a random access channel and configuration of a common search space.

[0063] In the related art, after the UE acquires the SSB, the UE determines the corresponding search space 0 according to the related information in the SSB, and acquires SIB1 according to the search space 0 to achieve cell access. In the initial access process, the original SSB corresponds to a period of 20 milliseconds (ms), and the basic unit corresponding to the search space 0 is also 20 ms. Therefore, after acquiring the SSB, the system frame corresponding to the search space 0 can be determined according to the system frame corresponding to the SSB. However, because the period of the SSB is lengthened (for example, from 20 ms to 160 ms or 320 ms or 640 ms) in order to shorten the SSB overhead, the corresponding search space 0 cannot be directly determined according to the SSB with the lengthened period.

[0064] The technical scheme provided in the application enhances the search space 0, and in the case that the enhanced search space 0 contains at least two adjacent system frames as a single basic unit, the starting frame number corresponding to the basic unit in the enhanced search space 0 is determined according to the system frame number corresponding to the SSB, that is, after the enhancement design of the search space 0, the relative position of the PMO in the original system frame is not changed, the starting frame number corresponding to the search space 0 is obtained by the system frame number corresponding to the SSB, and the search space 0 can be accurately determined after the SSB is extended, thereby reducing the complexity of UE implementation.

[0065] Illustratively, refer to FIG. 2, which shows a flowchart of a communication method provided in an example embodiment of the application, which can be executed by a terminal device or a network device, as shown in FIG. 2, the method includes the following steps:

[0066] In step 210, the starting frame number corresponding to at least one basic unit in the search space 0 is determined based on the system frame number of the first system frame.

[0067] In the embodiment, the first system frame is used for transmitting a synchronization signal block (SSB), and the basic unit includes at least two adjacent system frames.

[0068] In the embodiment, one SSB occupies 4 consecutive orthogonal frequency division multiplexing (OFDM) symbols in time domain.

[0069] In the embodiment, the first system frame can also be referred to as an SSB system frame.

[0070] Illustratively, for a single SSB, each system frame used for transmitting the SSB corresponds to an independent number, which is used as the system frame number.

[0071] Illustratively, the basic unit refers to the basic structure of the search space 0, and the search space 0 can include one or more basic units, each of which is composed of at least two adjacent system frames, and the adjacent two basic units correspond to non-overlapping system frames, that is, for a system frame, it can only be in one basic unit of the search space 0.

[0072] In the embodiment, two consecutive system frames in the search space 0 are taken as an example for illustration, which include an odd system frame and an even system frame.

[0073] In some embodiments, the i-th starting frame number corresponding to the i-th basic unit in the search space 0 is determined based on the system frame number of the first system frame, and i is 0 or a positive integer.

[0074] Illustratively, after obtaining the SSB, a starting frame number corresponding to at least one basic unit in the search space 0 is determined according to a frame number of a system frame in which the SSB is located.

[0075] In one case, a starting frame number corresponding to a first basic unit in the search space 0 is determined according to a frame number of a system frame in which the SSB is located, and the starting frame number is taken as a first starting frame number.

[0076] In another case, a starting frame number corresponding to any basic unit in the search space 0 is determined according to a frame number of a system frame in which the SSB is located.

[0077] In yet another case, starting frame numbers corresponding to all basic units in the search space 0 are determined according to a frame number of a system frame in which the SSB is located.

[0078] In some embodiments, a relevant parameter corresponding to the system frame number is obtained; the i-th starting frame number is determined based on the system frame number and the relevant parameter; wherein the relevant parameter includes at least one of the following: a density value of the search space 0 relative to the first system frame; a periodicity parameter of the SSB; a system frame offset.

[0079] In this embodiment, the following four different determination methods of the starting system frame number are provided.

[0080] Method one: determination according to the system frame number.

[0081] Specifically, reference can be made to the following formula one:

[0082] Formula one:

[0083] wherein, is a system frame number of a system frame in which an SSB with index i is located, indicates a starting frame number corresponding to a basic unit in the search space 0, and formula one indicates that the system frame number of the system frame in which the SSB is located is divided by 2, the result is rounded, multiplied by 2, and then 2 is added, to obtain the starting frame number corresponding to the basic unit in the search space 0.

[0084] In this method, two SSB system frames correspond to a starting system frame of a basic unit in the search space 0, for example: in the case of SSB system frame 0 and SSB system frame 1, the starting frame number corresponding to the basic unit in the search space 0 is 2, and in the case of SSB system frame 2 and SSB system frame 3, the starting frame number corresponding to the basic unit in the search space 0 is 4.

[0085] The above basic unit in the search space 0 can be the first basic unit in the search space 0, or other basic units in the search space 0 except the first basic unit.

[0086] Mode two: determined according to the system frame number and the system frame offset.

[0087] Specifically, reference can be made to the following Formula Two:

[0088] Formula Two:

[0089] wherein, is the system frame number of the system frame in which the SSB indexed as i is located, indicates the system frame number corresponding to the basic unit in the search space, and Δ1 indicates the system frame offset, and the unit thereof is system frame, wherein Δ1 can be positive or negative.

[0090] According to Formula One and Formula Two, it can be seen that mode two adds the system frame offset on the basis of Formula One. Since the starting system frame corresponding to the SSB system frame and the basic unit in the search space 0 can not be in a corresponding relationship, by adding the system frame offset, the starting system frame corresponding to the basic unit in the search space 0 can be calculated in the scenario where the starting system frame corresponding to the SSB system frame and the basic unit in the search space 0 is not in a corresponding relationship, and the resources of SS#0 can be configured more flexibly.

[0091] In this mode, if two SSB system frames correspond to the starting system frame of one basic unit in the search space 0, the system frame offset is one system frame unit, and when the SSB system frame is 0 and the SSB system frame is 1, the corresponding starting frame number of the basic unit in the search space 0 is 3, and when the SSB system frame is 2 and the SSB system frame is 3, the corresponding starting frame number of the basic unit in the search space 0 is 5.

[0092] Mode three: determined according to the system frame number, the density value of the search space 0 relative to the first system frame, and the SSB period parameter.

[0093] Specifically, reference can be made to the following Formula Three:

[0094] Formula Three:

[0095] wherein, is the system frame number of the system frame in which the SSB indexed as i is located, indicates the system frame number corresponding to the basic unit in the search space, M indicates the density value of the search space 0 relative to the first system frame, that is, M SSB system frames correspond to one starting frame of SS#0, and T is the period of the SSB, and the unit thereof is system frame.

[0096] According to Formula Three, when the arrangement density of the SSB system frame is different from the arrangement density of the system frame in the search space 0, the starting frame number of the basic unit in the search space 0 is determined according to the density value of the search space 0 relative to the first system frame and the number of periods corresponding to the SSB.

[0097] Method Four: Determining according to the system frame number, the density value of the search space 0 relative to the first system frame, the SSB period parameter, and the system frame offset.

[0098] Specifically, reference can be made to the following Formula Three:

[0099] Formula Three:

[0100] wherein, is the system frame number of the system frame in which the SSB with the index i is located, denotes the system frame number of the basic unit in the search space, M denotes the density value of the search space 0 relative to the first system frame, that is, M SSB system frames correspond to one starting frame of SS#0, T is the period of the SSB, in units of system frames, and Δ2 denotes the system frame offset, in units of system frames. Δ2 can be positive or negative.

[0101] According to Formula Three and Formula Four, it can be seen that Formula Four adds a system frame offset on the basis of Formula Three.

[0102] In some embodiments, the search space 0 includes a plurality of basic units, the i-th starting frame number includes a first starting frame number, the first starting frame number corresponds to a first basic unit, the plurality of basic units include a j-th basic unit, j≥1 and j is an integer; a system frame interval value corresponding to the j-th basic unit is obtained, the system frame interval value is determined by the starting frame corresponding to the j-th basic unit and the starting frame corresponding to the first basic unit, the starting frame is a system frame at the starting position in the basic unit, and the adjacent system frame interval value≥2; the starting frame number corresponding to the j-th basic unit is determined based on the first starting frame number and the system frame interval value.

[0103] In this embodiment, when the search space 0 includes a plurality of basic units, when i is 0, it indicates the first starting frame number corresponding to the first basic unit, and in the plurality of basic units, in addition to the first basic unit, there is also a j-th basic unit.

[0104] It is worth noting that since the system frame number starts from 0, when the system frame is numbered 0, it indicates that the current system frame is the first system frame.

[0105] When the first start frame number corresponding to the first basic unit is determined, the start frame number in the jth basic unit is determined according to the system frame interval value between the start frame in the jth basic unit and the start frame in the first basic unit. For details, refer to Formula Five.

[0106] Formula Five:

[0107] wherein, denotes the system frame number corresponding to the first basic unit in the search space, and S is the interval value of the start position system frame of adjacent basic units, that is, if the start system frame of the jth basic unit is J1 and the start system frame in the first basic unit is J0, then S = J0-J1.

[0108] wherein, since a single basic unit is composed of at least two adjacent system frames, S≥2.

[0109] In combination with the arrangement mode of the system frames in the search space 0 described above, the SIB1 PDCCH retransmission scheme will be described in detail below. For illustration, refer to FIG. 3, which shows a flowchart of a communication method provided by an example embodiment of the present application, which is executed by the terminal device and the network device together.

[0110] Step 310: The network device sends SIB1 PDCCH to the terminal device through the search space 0 on at least one physical downlink control channel detection occasion PMO.

[0111] For illustration, the physical downlink control channel detection occasion (PDCCH monitoring occasion, PMO) refers to the occasion for detecting PDCCH, and the UE detects PDCCH at the position of PMO, while whether to send PDCCH to the UE on the specified PMO can be determined by the network device itself.

[0112] wherein, PMO denotes the time domain position of the base station that may send PDCCH, and the basic unit is OFDM symbol, that is, PMO is continuous N OFDM symbols in time domain.

[0113] wherein, PMO denotes the time domain position of the base station that may send DCI information through PDCCH, and the basic unit is OFDM symbol, that is, PMO is continuous N OFDM symbols in time domain.

[0114] For illustration, for one SSB, there are 2 PMOs in the basic unit in the search space 0 corresponding to the SSB, and if the basic unit is composed of two adjacent system frames, the 2 PMOs are synchronously present in the former one of the two system frames, or the 2 PMOs are synchronously present in the latter one of the two system frames.

[0115] SIB1 is transmitted in a physical downlink shared channel (PDSCH) for example, but SIB1 needs to be scheduled by a PDCCH. That is, the UE needs to first detect the PDCCH to obtain the scheduling information corresponding to the SIB1, and then receive the SIB1 sent by the network device on the PDSCH.

[0116] In the embodiment, when the network device transmits PDCCH to the user equipment R times, when R = 1, it means initial transmission, and if R > 1, it means that it is currently in the retransmission process, that is, in the case of transmitting PDCCH R times, it includes one initial transmission and R-1 times of retransmission.

[0117] In some embodiments, the network device sends first information to the terminal device, the first information including at least one of a transmission mode or a number of repeated transmissions, the transmission mode being a pattern of PMO available for transmitting PDCCH, and the number of repeated transmissions being a number of times of transmitting PDCCH with the same downlink control information (DCI).

[0118] The pattern of PMO refers to the distribution of PDCCH in the time domain for example.

[0119] If the pattern represents the time domain distribution, it represents the OFDM symbol on the subframe corresponding to the PMO when the PDCCH is transmitted.

[0120] The number of repeated transmissions refers to the number of times of repeatedly transmitting DCI indication information after the first transmission of PDCCH.

[0121] In the embodiment, after determining the starting system frame number corresponding to the basic unit in the search space 0 through the SSB system frame number, the frame number corresponding to each system frame in the basic unit in the search space 0 can be obtained based on the starting system frame number.

[0122] On this basis, the UE detects the PDCCH corresponding to the SIB1 on at least one PMO through the search space 0, thereby obtaining the scheduling information corresponding to the SIB1, and then receiving the SIB1 sent by the network device on the PDSCH.

[0123] In some embodiments, the plurality of PMOs respectively correspond to a number; and the pattern includes at least one of the following: the numbers corresponding to the plurality of PMOs are arranged in continuous increments; the numbers corresponding to the plurality of PMOs are arranged in increments according to a first preset interval; and the numbers corresponding to the plurality of PMOs are arranged in increments, wherein a second preset interval between the numbers corresponding to at least two groups of adjacent PMOs is different.

[0124] Optionally, the numbers corresponding to the plurality of PMOs are consecutive numbers, for example: {1, 2, 3, 4}; or the numbers corresponding to the plurality of PMOs are arranged in a first preset interval, for example: {1, 3, 5, 7}; or the numbers of the plurality of PMOs are arranged in an increasing order, but there are at least two groups of PMOs corresponding to a second preset interval, for example: {1, 3, 6, 9}, and the second preset interval between PMO2 and PMO0 is 2, and the second preset interval between PM3 and PM2 is 3.

[0125] In some embodiments, the plurality of PMOs correspond to numbers respectively, the plurality of PMOs include a first PMO, the first PMO is used for initial transmission of a PDCCH; the first PMO is determined based on a transmission number of a DCI transmitted by the PDDCH; or a PMO at a first position in the plurality of PMOs is taken as the first PMO.

[0126] Illustratively, the first PMO refers to a PMO corresponding to initial transmission of a PDCCH.

[0127] Optionally, the number of the first PMO can be fixed or unfixed, which is not limited.

[0128] In one case, the number of the first PMO is unfixed.

[0129] In this embodiment, the numbers of the consecutive available PMOs carrying the PDCCH are represented as {i0, i1,..., ik,..., ik+1,..., ik+R-1}, where k is numbered from 0, and N≥R. N-1}, where k is numbered from 0, and N≥R.

[0130] In some embodiments, in the case that the result of the modulo operation between the number corresponding to the mth PMO and the transmission number is zero, the mth PMO is taken as the first PMO, and m is 0 or a positive integer.

[0131] In this embodiment, the PMO corresponding to the initial transmission of the network device is represented as ik, and k is numbered from 0. k The following formula six can be satisfied.

[0132] Formula six: kmodR=0

[0133] Wherein, R represents the transmission number, that is, the remainder is 0 when the number of the initial transmission PMO is divided by the transmission number.

[0134] Optionally, the arrangement mode of the available PMOs includes the following three modes:

[0135] The first kind is that the numbers of the PMOs carrying the SIB1 PDCCH are: [k0, k0+1,..., k0+R-1];

[0136] Wherein, k0+R-1≤N-1.

[0137] For example, if the consecutive PMO sequence numbers available for PDCCH transmission are {0,1,2,3}, the supported transmission counts are {1,2,4}. That is, different DCI information may be transmitted on PMO0, PMO1, PMO2, and PMO3, with each DCI information transmitted once (or not transmitted at all); or, the same DCI information may be transmitted in PMO0 and PMO1, and this DCI information may be retransmitted once (or not transmitted at all); or, the same DCI information may be transmitted in PMO2 and PMO3, and this DCI information may be retransmitted once (or not transmitted at all); or, the same DCI information may be transmitted four times on PMO0, PMO1, PMO2, and PMO3, meaning the DCI information transmitted on each PMO sequence number is the same, and this DCI information may be retransmitted three times (or not transmitted at all).

[0138] For illustration, please refer to Figure 4, which shows a schematic diagram of the number of PDCCH retransmissions provided in an exemplary embodiment of this application. As shown in Figure 4, the current display shows the PMO sequence number arrangement. Taking the first row as an example, the PDCCH may or may not transmit DCI information in each PMO. Furthermore, if the PDCCH transmits DCI information in each PMO, the DCI information transmitted in each PMO is different (represented by different fill content corresponding to R1). That is, a single DCI information is transmitted once in the current case. Taking the second row as an example, the PDCCH may transmit the same DCI information twice or may not transmit DCI information, such as sequence numbers 401 and 402. Sequence numbers 401 and 402 correspond to different PMO timing sequence numbers. The same DCI information (R2) may be transmitted in sequence numbers 401 and 402, or R2 may not be transmitted in sequence numbers 401 and 402. Taking the third row as an example, the PDCCH may transmit the same DCI information (R4) four times or may not transmit DCI information (squares with the same fill content indicate that the same DCI information is transmitted, or that no DCI information is transmitted).

[0139] For each row, the same pattern represents the same PDCCH transmission process. For example, in the first row, the PDCCH may or may not be transmitted in the four PMOs, that is, the current transmission opportunity is 4 times; in the second row, the PDCCH is transmitted in two 2-transmission opportunities, in PMO0 and PMO1, or in PMO2 and PMO3, or not transmitted; in the third row, the PDCCH may transmit the same DCI information 4 times, once in each of PMO0, PMO1, PMO2 and PMO3, or not transmit DCI information.

[0140] The second: the sequence number of the PMO carrying the SIB1 PDCCH is: [k0, k0+L,..., k0+(R-1)L]

[0141] Wherein, L is set according to actual needs.

[0142] The third: the sequence number of the PMO carrying the SIB1 PDCCH is: [k0, k0+L0,..., k0+L R-1 ]

[0143] Wherein, when j>i, L j > L i .

[0144] In another case, the first PMO is a fixed sequence number.

[0145] For example, the first row of the PMO sequence number pattern is shown in FIG. 5, wherein, the PDCCH in the first PMO may transmit DCI information, or may not transmit DCI information; for example, the second row of the PDCCH, the same DCI information may be transmitted twice, or may not be transmitted, and the transmission opportunity is any two of the four PMO sequence numbers in FIG. 5; for example, the third row of the PDCCH, the same DCI information may be transmitted four times, or may not be transmitted.

[0146] In one case, when there is repeated transmission, the terminal device performs blind detection on all supported repeated transmission patterns, that is, without knowing which PMO the network device sends the PDCCH, the terminal device randomly detects the PDCCH on the PMO.

[0147] In another case, the terminal device uses blind detection when initially accessing. After the terminal device successfully accesses, the network device tells the UE the actual transmission mode and / or the number of repeated transmissions through system information, and after the UE receives the system information, the UE no longer needs to perform blind detection, but detects the PDCCH in the corresponding PMO according to the system information of the network device.

[0148] The communication method of the embodiments of the present application is introduced above in combination with the drawings. It should be understood that although each step in the flowchart involved in each of the above embodiments is shown in sequence, these steps are not necessarily executed in sequence as shown in the figure. Unless explicitly stated herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps. The communication apparatus of the embodiments of the present application is introduced below in combination with the drawings.

[0149] FIG. 6 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present application. As shown in FIG. 6, the electronic device 4000 includes at least one processor 4001 (only one is shown in FIG. 6), a memory 4002, and a computer program 4003 stored in the memory 4002 and executable on the at least one processor 4001, wherein the processor 4001 executes the computer program 4003 to implement the steps in any of the above methods.

[0150] In an implementation manner, the electronic device 4000 is a user equipment, configured to execute the steps executed by the user equipment in the above method.

[0151] In another implementation manner, the electronic device 4000 is a network device, configured to execute the steps executed by the network device in the above method.

[0152] Those skilled in the art can understand that FIG. 6 is only an example of the electronic device, and does not constitute a limitation on the electronic device, and in practice, the electronic device can include more or fewer components than shown, or combine certain components, or different components, for example, it can also include input / output devices, network access devices, etc.

[0153] The processor 4001 can be a central processing unit (CPU), other general purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc. The general purpose processor can be a microprocessor or the processor can be any conventional processor.

[0154] The memory 4002 can be an internal storage unit of the electronic device 4000 in some embodiments, for example, a hard disk or a memory of the electronic device 4000. The memory 4002 can also be an external storage device of the electronic device 4000 in other embodiments, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 4000. Alternatively, the memory 4002 can include both the internal storage unit and the external storage device of the electronic device 4000. The memory 4002 is used to store an operating system, application programs, a boot loader, data and other programs, for example, program codes of the computer programs, etc. The memory 4002 can also be used to temporarily store data that has been output or will be output.

[0155] It should be noted that the information interaction, execution process, etc. between the above apparatuses / units, since based on the same concept as the method embodiments of the present application, the specific functions and the technical effects brought by them can be referred to the method embodiments part, and will not be described here in detail.

[0156] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and modules is taken as an example, and in actual application, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction, and do not limit the protection scope of the present application. The specific working process of the unit and module in the system can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

[0157] The embodiment of the present application also provides an electronic device, comprising at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, wherein the processor implements the steps in any of the above method embodiments when executing the computer program.

[0158] The electronic device can be a user equipment for executing the steps performed by the user equipment, or the electronic device can be a network device for executing the steps performed by the network device.

[0159] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, wherein the computer program is executed by a processor to implement the steps in any of the above method embodiments.

[0160] The embodiment of the present application also provides a chip, comprising a processor, wherein the processor is used to read and execute a computer program stored in a memory, and the computer program is executed by the processor to implement the steps in any of the above method embodiments.

[0161] Optionally, the chip further comprises a memory, and the memory is electrically connected with the processor.

[0162] Optionally, the chip can further comprise a communication interface.

[0163] The embodiment of the present application also provides a computer program product, which is executed by a processor to implement the steps in any of the above method embodiments.

[0164] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the present application can implement all or part of the processes in the above-mentioned embodiment methods through a computer program to instruct relevant hardware to complete, and the computer program can be stored in a computer readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms. The computer readable medium can at least include any entity or device capable of carrying the computer program code to the photographing device / user equipment, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. For example, U disk, mobile hard disk, magnetic disk or optical disk, etc. In some jurisdictions, according to legislation and patent practice, the computer readable medium can not be an electrical carrier signal and a telecommunication signal.

[0165] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0166] Those of ordinary skill in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0167] In the embodiments provided by the present application, it should be understood that the disclosed devices / equipment and methods can be implemented in other ways. For example, the above-described device / equipment embodiments are merely illustrative, and the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0168] The units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, can be located in one place, or can also be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0169] It should be understood that the term "comprising" as used in the specification and the appended claims indicates the presence of the recited features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0170] It should also be understood that the term "and / or" as used in the specification and the appended claims, means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0171] As used in the specification and the appended claims, the term "if" can be interpreted as meaning "when" or "once" or "in response to a determination" or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if detected [the described condition or event]" can be interpreted to mean "once determined" or "in response to a determination" or "once detected [the described condition or event]" or "in response to detecting [the described condition or event]" depending on the context.

[0172] In addition, in the description of the specification and the appended claims, the terms "first", "second", "third", etc. are only used for differentiation of description, and cannot be understood as indicating or implying relative importance.

[0173] In the present application, the reference "one embodiment" or "some embodiments" and the like means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in further some embodiments" and the like appearing in different places in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0174] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A communication method characterized by comprising: The method is applied to a terminal device, and the method comprises: determining a starting frame number corresponding to at least one basic unit in search space 0 based on a system frame number of a first system frame, wherein the first system frame is used for transmitting a synchronization signal block (SSB), and the basic unit comprises at least two adjacent system frames.

2. The method of claim 1, wherein, The method further comprises: determining the starting frame number corresponding to the at least one basic unit in the search space 0 based on the system frame number of the first system frame comprises:

3. The method of claim 2, wherein, determining an i-th starting frame number corresponding to an i-th basic unit in the search space 0 based on the system frame number of the first system frame, wherein i is 0 or a positive integer. The method further comprises: determining the i-th starting frame number corresponding to the i-th basic unit in the search space 0 based on the system frame number of the first system frame comprises: obtaining a related parameter corresponding to the system frame number; determining the i-th starting frame number based on the system frame number and the related parameter; The related parameter comprises at least one of the following: a density value of the search space 0 relative to the first system frame; 4. The method of claim 2, wherein, a periodicity parameter of the SSB; a system frame offset. The search space 0 comprises a plurality of basic units, the i-th starting frame number comprises a first starting frame number, the first starting frame number corresponds to a first basic unit, the plurality of basic units comprise a j-th basic unit, j is greater than or equal to 1 and is an integer; The method further comprises:

5. The method according to any one of claims 1 to 4, characterized in that, obtaining a system frame interval value corresponding to the j-th basic unit, wherein the system frame interval value is determined by a starting frame corresponding to the j-th basic unit and a starting frame corresponding to the first basic unit, the starting frame is a system frame at a starting position in the basic unit, and adjacent system frame interval values are greater than or equal to 2; determining a starting frame number corresponding to the j-th basic unit based on the first starting frame number and the system frame interval value. The search space 0 corresponds to a plurality of physical downlink control channel detection occasions (PMO); 6. The method of claim 5, wherein, The method further comprises: detecting, through the search space 0, a physical downlink control channel (PDCCH) corresponding to a system information block (SIB1) on at least one PMO, wherein the PDCCH corresponding to the SIB1 refers to a PDCCH scheduling a physical downlink shared channel (PDSCH) carrying the SIB1.

7. The method of claim 6, wherein, The method further comprises: receiving first information, wherein the first information comprises at least one of a transmission mode or a number of repeated transmissions, the transmission mode refers to a pattern of PMOs available for transmitting the PDCCH, and the number of repeated transmissions refers to a number of times that the PDCCH transmits the same downlink control information (DCI). The plurality of PMOs respectively correspond to numbers; The pattern comprises at least one of the following: The numbers corresponding to the plurality of PMOs are arranged in a continuous increasing manner; 8. The method of claim 6, wherein, The numbers corresponding to the plurality of PMOs are arranged in an increasing manner according to a first preset interval; The numbers corresponding to the plurality of PMOs are arranged in an increasing manner, and a second preset interval between numbers corresponding to at least two groups of adjacent PMOs is different. The plurality of PMOs respectively correspond to numbers, the plurality of PMOs comprise a first PMO, and the first PMO is used for initially transmitting the PDCCH; The method further comprises: determine the first PMO based on a number of times of transmitting the DCI by the PDCCH; or take a PMO in a first position in the plurality of PMOs as the first PMO.

9. The method of claim 8, wherein, The method further includes: In a case where a modulo operation result between a number corresponding to an mth PMO and the number of times of transmitting the DCI is zero, take the mth PMO as the first PMO, where m is 0 or a positive integer.

10. A communication method characterized by comprising: The method is applied to a network device, and the method includes: determine a starting system frame number corresponding to at least one basic unit in search space 0 based on a system frame number of a first system frame, the first system frame being used for transmitting an SSB, wherein the basic unit includes at least two adjacent system frames.

11. The method of claim 10, wherein, The method further includes: determine an i-th starting system frame number corresponding to an i-th basic unit in the search space 0 based on the system frame number of the first system frame, i being 0 or a positive integer; determine starting system frame numbers corresponding to other basic units in the search space 0 except the i-th basic unit based on the i-th starting system frame number.

12. The method of claim 11, wherein, The method further includes: obtain a related parameter corresponding to the system frame number; determine the i-th starting system frame number based on the system frame number and the related parameter; The related parameter includes at least one of the following: a density value of the search space 0 relative to the first system frame; a periodicity parameter of the SSB; a system frame offset.

13. The method of claim 11, wherein, The search space 0 includes a plurality of basic units, the i-th starting system frame number includes a first starting system frame number, the first starting system frame number corresponds to a first basic unit, the plurality of basic units include a j-th basic unit, j≥1 and j being an integer; The method further includes: obtain a system frame interval value corresponding to the j-th basic unit, the system frame interval value being determined by a starting system frame corresponding to the j-th basic unit and a starting system frame corresponding to the first basic unit, the starting system frame being a system frame in a starting position in the basic unit, adjacent system frame interval values being greater than or equal to 2; determine a starting system frame number corresponding to the j-th basic unit based on the first starting system frame number and the system frame interval value.

14. The method according to any one of claims 10 to 13, characterized in that, The search space 0 corresponds to a plurality of PMOs. The method further includes: transmit, to a terminal device, a PDCCH corresponding to a SIB1 on at least one PMO through the search space 0, the PDCCH corresponding to the SIB1 being a PDCCH scheduling a PDSCH carrying the SIB1.

15. The method of claim 14, wherein, The method further includes: transmit, to the terminal device, first information, the first information including at least one of a transmission mode or a number of times of repeated transmission, the transmission mode being a pattern of PMOs available for transmitting the PDCCH, and the number of times of repeated transmission being a number of times of transmitting the PDCCH with the same DCI.

16. The method of claim 15, wherein, The plurality of PMOs respectively correspond to numbers; The pattern comprises at least one of the following: The numbers corresponding to the plurality of PMOs are arranged in continuous increments; The numbers corresponding to the plurality of PMOs are arranged in increments according to a first preset interval; The numbers corresponding to the plurality of PMOs are arranged in increments, wherein the second preset interval between the numbers corresponding to at least two groups of adjacent PMOs is different.

17. The method of claim 15, wherein, The plurality of PMOs respectively correspond to numbers, and the plurality of PMOs comprises a first PMO, wherein the first PMO is used for initial transmission of the PDCCH. The method further comprises: determining the first PMO based on a transmission number of the PDCCH transmitting the DCI; or taking the PMO at the first position in the plurality of PMOs as the first PMO.

18. The method of claim 17, wherein, The determination of the first PMO based on the transmission number of the PDCCH transmitting the DCI comprises: in a case where a modulo operation result between a number corresponding to an mth PMO and the transmission number is zero, taking the mth PMO as the first PMO, m being 0 or a positive integer.

19. A communications device, characterized by comprise: a determination unit, configured to determine a starting system frame number corresponding to at least one basic unit in a search space 0 based on a system frame number of a first system frame, wherein the first system frame is used for transmission of a synchronization signal block (SSB), and wherein the basic unit comprises at least two adjacent system frames.

20. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the computer program to implement the method in any one of claims 1 to 9.

21. A network device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein, The processor executes the computer program to implement the method in any one of claims 10 to 18.

22. A computer-readable storage medium, the computer-readable storage medium storing a computer program, characterized in that, The computer program is executed by the processor to implement the method in any one of claims 1 to 9, or any one of claims 10 to 18.

23. A computer program product, characterised in that, The computer program is executed by the processor to implement the method in any one of claims 1 to 9, or any one of claims 10 to 18. The computer program is executed by the processor to implement the method in any one of claims 1 to 9, or any one of claims 10 to 18.

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