Communication method and communication apparatus

Abstract

The present application provides a communication method and a communication apparatus, so as to improve the probability of terminal devices successfully accessing networks. The communication method comprises: a terminal device acquires a first time slot, the first time slot being determined on the basis of a synchronization signal block (SSB) received from a network device; and, on the basis of the first time slot, the terminal device receives K physical downlink control channels (PDCCHs) associated with the SSB, each of the K PDCCHs being used for scheduling a broadcast message, and K being a positive integer greater than 1.

Description

Communication method and communication apparatus

[0001] The present application claims priority to the Chinese patent application No. 202411093537.7, filed on August 8, 2024, and entitled "Communication method and communication apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of communication, in particular to a communication method and a communication apparatus. BACKGROUND

[0003] Satellite communication has its unique advantages compared to ground communication, such as providing wider coverage; satellite base stations are not easily damaged by natural disasters or external forces. Satellite communication can provide communication services for areas such as oceans and forests that cannot be covered by ground communication networks, enhancing the reliability of 5G communication, such as ensuring that airplanes, trains, and users on these vehicles obtain better communication services. Satellite communication provides more data transmission resources for 5G communication, improving network speed. Therefore, supporting both ground communication and satellite communication is an inevitable trend for future 5G communication, which has great benefits in terms of wide coverage, reliability, multi-connection, and high throughput.

[0004] Satellite communication has the characteristics of large round trip time (RTT), and the terminal needs to perform frequent beam and cell switching due to the movement of the satellite. Therefore, the integration of satellite and 5G communication requires enhancements to existing 5G protocols to adapt to satellite communication.

[0005] In existing satellite communication, due to the large round trip time (RTT), there may be a problem that the terminal device cannot successfully parse the downlink control information (DCI) carried in the physical downlink control channel (PDCCH), which affects the terminal device's access to the network. SUMMARY

[0006] The present application provides a communication method and a communication apparatus to improve the probability of successful access of the terminal device to the network.

[0007] In a first aspect, the present application provides a communication method, which can be executed by a terminal device, or can be executed by a component (such as a chip, a chip system, etc.) configured in the terminal device, or can be a logic module or software capable of realizing all or part of the functions of the terminal device, and the present application does not limit this. In the present application, the terminal device is taken as an example for description.

[0008] Exemplarily, the communication method comprises: obtaining a first time slot, the first time slot being determined based on a received synchronization signal block (SSB); receiving K PDCCHs associated with the SSB based on the first time slot, wherein each of the K PDCCHs is used to schedule a broadcast message, and K is a positive integer greater than 1.

[0009] It can be understood that the PDCCH described herein is a Type0-PDCCH.

[0010] In the communication method provided by the embodiment, one SSB is associated with K PDCCHs, so that the DCI corresponding to the SSB can be transmitted based on the K PDCCHs instead of being transmitted based on one PDCCH. Correspondingly, the terminal device can obtain the DCI corresponding to the SSB based on receiving the multiple PDCCHs, so that the probability of successfully parsing the DCI by the terminal device is improved, thereby improving the probability of successful access by the terminal.

[0011] In combination with the first aspect, in a possible implementation manner, the K PDCCHs carry the same DCI, and time domain resources occupied by different PDCCHs in the K PDCCHs are located in different time slots, and the DCI is the DCI corresponding to the SSB.

[0012] Exemplarily, when the K PDCCHs carry the same DCI and time domain resources occupied by different PDCCHs in the K PDCCHs are located in different time slots, the time domain resources occupied by the K PDCCHs in the respective corresponding time slots include the same symbols. That is, it can be considered that the positions of the symbols occupied by the K PDCCHs in the K time slots are the same.

[0013] Exemplarily, when the K PDCCHs carry the same DCI and time domain resources occupied by different PDCCHs in the K PDCCHs are located in different time slots, the starting symbols of the time domain resources occupied by part or all of the PDCCHs in the K PDCCHs in the respective corresponding time slots are different. That is, it can be considered that the positions of the symbols occupied by the K PDCCHs in the K time slots are different. In this way, optionally, the network device can send first information to the terminal device, the first information being used to indicate the starting symbols of the time domain resources occupied by each PDCCH in the K PDCCHs; correspondingly, the terminal device obtains the positions of the K PDCCHs on the time domain resources based on the indication of the first information, so as to receive the K PDCCHs.

[0014] It can be seen that in the technical solution, the network device transmits K PDCCHs associated with the SSB received by the terminal device in different slots, and the DCI carried by the PDCCH transmitted in each slot is also the same, that is, the network device can be considered to repeatedly transmit the DCI corresponding to the SSB in K slots. Correspondingly, the terminal device receives the K PDCCHs transmitted by the network device in the K slots. That is, in this implementation manner, the link budget when transmitting the DCI corresponding to the SSB is improved through the repeated transmission manner, so that the probability of successfully parsing the DCI by the terminal device is improved, and then the probability of successful access by the terminal is improved.

[0015] In combination with the first aspect, in a possible implementation manner, different PDCCHs in the K PDCCHs carry different contents in the DCI, and the time domain resources occupied by the different PDCCHs in the K PDCCHs are located in different slots. The DCI is the DCI corresponding to the SSB.

[0016] For example, in an implementation manner, the DCI corresponding to the SSB can be divided into K different code blocks (CBs), and then the K code blocks (CBs) are encoded to obtain K groups of encoding bits corresponding to the K CBs, respectively. Then, the K groups of encoding bits are carried and transmitted on the same time domain resources in the K slots. Correspondingly, the terminal device first decodes the K PDCCHs received from the K slots, respectively, and then obtains the DCI based on the decoding results of the K PDCCHs, respectively.

[0017] For example, in another implementation manner, the DCI corresponding to the SSB can be first encoded to obtain target encoding bits, and then the target encoding bits are divided into K parts and carried and transmitted on the same time domain resources in the K slots, wherein different PDCCHs in the K PDCCHs carry different parts. Correspondingly, the terminal device obtains the target encoding bits from the K PDCCHs received from the K slots, and decodes the target encoding bits to obtain the DCI.

[0018] It can be seen that in the technical solution, since the DCI is carried by the K PDCCHs, the code rate of the DCI can be reduced, thereby improving the decoding performance of the terminal device.

[0019] In combination with the first aspect, in a possible implementation manner, the K PDCCHs carry the same DCI, the K PDCCHs occupy different time domain resources in the first slot, and the DCI is the DCI corresponding to the SSB.

[0020] Exemplarily, the network device can send second information to the terminal device, the second information being used to indicate a starting symbol of time domain resources occupied by each of the K PDCCHs in the first time slot; correspondingly, the terminal device obtains a position of each of the K PDCCHs in the first time slot in the time domain based on the second information, so as to receive the K PDCCHs in the first time slot.

[0021] Exemplarily, a starting symbol of time domain resources occupied by any two of the K PDCCHs is spaced by P symbols, and P is equal to a number of symbols occupied by any one of the K PDCCHs.

[0022] Exemplarily, when the index of the SSB is even, the starting symbol of time domain resources occupied by the i-th PDCCH in the K PDCCHs in the first time slot is or, when the index of the SSB is odd, the starting symbol of time domain resources occupied by the i-th PDCCH in the K PDCCHs in the first time slot is i is from 1 to K; wherein, represents the number of symbols occupied by any one of the K PDCCHs.

[0023] Exemplarily, when the index of the SSB is odd, the starting symbol of time domain resources occupied by the j-th PDCCH in the K PDCCHs is wherein, represents the number of symbols occupied by any one of the K PDCCHs, L represents a number of PDCCHs associated with the SSB with an even index, and j is from 1 to K.

[0024] That is, the network device sends the K PDCCHs associated with the SSB received by the terminal device on different time domain resources in the first time slot, and the DCI carried by the PDCCHs sent in the first time slot is also the same, that is, the network device can be considered to have repeated sending the DCI corresponding to the SSB K times in the first time slot. Correspondingly, the terminal device receives the K PDCCHs sent by the network device in the first time slot. That is, in this implementation manner, the link budget when sending the DCI corresponding to the SSB is improved through the repeated sending manner, so that the probability of successfully parsing the DCI by the terminal device is improved, and then the probability of successful access by the terminal device is improved.

[0025] In a second aspect, the present application provides a communication method, which can be executed by a network device, or can be executed by a component (such as a chip, a chip system, etc.) configured in the network device, or can be a logic module or software capable of realizing all or part of the network device functions, and the present application does not make any limitation thereon. In the present application, the network device is taken as an example for description.

[0026] Exemplarily, the communication method comprises: transmitting a synchronization signal block (SSB); and transmitting K physical downlink control channels (PDCCHs) associated with the SSB, wherein each of the K PDCCHs is used for scheduling a broadcast message, and K is a positive integer greater than 1.

[0027] With reference to the second aspect, in a possible implementation, the K PDCCHs carry same downlink control information (DCI), and different ones of the K PDCCHs occupy time domain resources in different slots.

[0028] With reference to the second aspect, in a possible implementation, the time domain resources occupied by the K PDCCHs in the respective corresponding slots comprise same symbols.

[0029] With reference to the second aspect, in a possible implementation, part or all of the K PDCCHs occupy different starting symbols of the time domain resources in the respective corresponding slots.

[0030] With reference to the second aspect, in a possible implementation, the method further comprises: transmitting first information, the first information being used for indicating starting symbols of the time domain resources occupied by each of the K PDCCHs.

[0031] With reference to the second aspect, in a possible implementation, different ones of the K PDCCHs carry different contents in downlink control information (DCI), the different ones of the K PDCCHs occupy time domain resources in different slots, and the DCI corresponds to the SSB.

[0032] With reference to the second aspect, in a possible implementation, the K PDCCHs carry same downlink control information (DCI), the DCI corresponds to the SSB, and the K PDCCHs occupy different time domain resources in a first slot.

[0033] With reference to the second aspect, in a possible implementation, the method further comprises: transmitting second information, the second information being used for indicating starting symbols of the time domain resources occupied by each of the K PDCCHs in the first slot.

[0034] With reference to the second aspect, in a possible implementation, starting symbols of the time domain resources occupied by any two of the K PDCCHs are spaced apart by P symbols, and P is equal to a number of symbols occupied by any one of the K PDCCHs.

[0035] In a possible implementation manner of the second aspect, the index of the SSB is even, and the starting symbol of the time domain resource occupied by the i th PDCCH in the K PDCCHs in the first slot is Or,

[0036] the index of the SSB is odd, and the starting symbol of the time domain resource occupied by the i th PDCCH in the K PDCCHs in the first slot is i is from 1 to K; wherein, represents the number of symbols occupied by any one of the K PDCCHs.

[0037] In a possible implementation manner of the second aspect, the index of the SSB is odd, and the starting symbol of the time domain resource occupied by the j th PDCCH in the K PDCCHs is wherein, represents the number of symbols occupied by any one of the K PDCCHs, L represents the number of PDCCHs associated with the SSB with an even index, and j is from 1 to K.

[0038] In the third aspect, the present application provides a communication apparatus, which includes a module or unit for implementing the method in the first aspect and any possible implementation manner of the first aspect, or a module or unit for implementing the method in the second aspect. It should be understood that each module or unit can realize the corresponding function by executing a computer program.

[0039] In the fourth aspect, the present application provides a communication apparatus, which includes a processor and a storage medium, the storage medium stores instructions, and the instructions are executed by the processor to realize the method in the first aspect or any possible implementation manner of the first aspect, or to realize the method in the implementation manner of the second aspect.

[0040] In the fifth aspect, the present application provides a communication apparatus, which includes a processing circuit, the processing circuit is used to process data and / or information, so as to realize the method in the first aspect or any possible implementation manner of the first aspect, or to realize the method in the implementation manner of the second aspect.

[0041] The processing circuit can include one or more processors, or all or part of the circuit for controlling or processing functions in the one or more processors.

[0042] Optionally, the apparatus can further include a memory, the memory is used to store a program or instructions, and the processor is used to execute the program or instructions, so as to realize the method in the first aspect or any possible implementation manner of the first aspect, or to realize the method in the implementation manner of the second aspect.

[0043] Optionally, the apparatus can further comprise the transceiver circuit, or the input / output interface.

[0044] In a sixth aspect, a chip is provided, comprising a processing circuit configured to execute a program or an instruction, so that the method in the first aspect or any possible implementation manner of the first aspect is implemented, or so that the method in the implementation manner of the second aspect is implemented.

[0045] Optionally, the chip can further comprise a memory configured to store the program or the instruction.

[0046] Optionally, the chip can further comprise the transceiver circuit, or the input / output interface.

[0047] In a seventh aspect, an apparatus is provided, comprising one or more processors and a communication circuit configured to perform at least one of input or output of signals by the apparatus; the one or more processors are configured to implement the method in the first aspect or any possible implementation manner of the first aspect, or the method in the second aspect or any possible implementation manner of the second aspect.

[0048] In an eighth aspect, a computer readable storage medium is provided, comprising instructions, when the instructions are executed by a processor, so that the method in the first aspect or any possible implementation manner of the first aspect is implemented, or so that the method in the second aspect or any possible implementation manner of the second aspect is implemented.

[0049] In a ninth aspect, a computer program product is provided, comprising computer program code or instructions, when the computer program code or instructions are executed, so that the method in the first aspect and any possible implementation manner of the first aspect is implemented, or so that the method in the second aspect and any possible implementation manner of the second aspect is implemented. BRIEF DESCRIPTION OF DRAWINGS

[0050] FIG. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application;

[0051] FIG. 2 shows a schematic diagram of actual time domain resources occupied by SSB0 and SSB1 corresponding to Type0-PDCCH when M=1 / 2;

[0052] FIG. 3 is a schematic flowchart of a communication method provided by an embodiment of the present application;

[0053] FIG. 4 shows a schematic diagram of time domain resources occupied by two PDCCHs associated with SSB when K equals 2;

[0054] FIG. 5 is a structural schematic diagram of a communication apparatus according to an embodiment of the present application;

[0055] FIG. 6 is a structural schematic diagram of a communication apparatus according to another embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0057] Before introducing the communication method and related apparatus provided by the embodiments of the present application, the following points are explained first:

[0058] First, in the present application, the use of prefixes such as "first", "second" and the like is merely for the convenience of distinguishing and describing different things belonging to the same name category, and does not constrain the order, size or quantity of the things. For example, "first information" and "second information" are only different information, and there is no time sequence, size relationship or priority relationship between them.

[0059] Second, in the present application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending first information to a terminal device" can be understood as that the destination of the information is the terminal device, which can include direct transmission through the air interface, or indirect transmission through the air interface by other units or modules. "Receiving first information from a network device" can be understood as that the source of the first information is the network device, which can include receiving directly from the network device through the air interface, or indirectly receiving from the network device through the air interface from other units or modules. "Sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface.

[0060] In other words, sending and receiving can be carried out between devices, for example, between a terminal device and a network device; or can be carried out within a device, for example, between components, modules, chips, software modules or hardware modules within a device through a bus, wire or interface.

[0061] Third, in this application, "at least one" means one or more, "multiple" means two or more. "And / or" describes the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after, but does not rule out the case that the associated objects before and after represent an "and" relationship. The specific meaning can be understood in conjunction with the context. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0062] Fourth, in this application, the indication includes direct indication (also known as explicit indication) and indirect indication (also known as implicit indication). Among them, directly indicating information A means including information A; indirectly indicating information A can mean indicating information A through the correspondence between information A and information B and directly indicating information B; or indicating information A through a preset rule that can be used to determine A according to B and directly indicating information B. Where the correspondence between information A and information B and the preset rule can be pre-defined, pre-stored, pre-burned, or pre-configured.

[0063] Fifth, in the embodiments of the present application, "when", "if" and "if" all mean that the device will make corresponding processing under certain objective circumstances, not limited by time, and also does not require the device to have a judgment action when it is implemented. Also does not mean that there are other limitations.

[0064] Sixth, in order to facilitate understanding, the method provided by the present application is described in the present application by means of multiple drawings, which are only examples and should not constitute any limitation on the present application. For example, the order of the steps shown in the drawings can be simply changed according to their functions and internal logic; for example, the steps in the drawings can be executed, or a part of them can be executed, as long as the same function as in the embodiments of the present application can be realized.

[0065] Seventh, in this application, "example", "exemplarily", "for example" or "such as" means to serve as an example, illustration or description. Any embodiment or design scheme described as "example", "exemplarily", "for example" or "such as" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "example", "exemplarily", "for example" or "such as" is intended to present the relevant concept in a specific manner.

[0066] The technical solutions provided in the present application can be applied to a 5th-Generation (5G) communication system or a future communication system. For example, one application scenario of the technical solutions provided in the present application is satellite communication.

[0067] With the development of information technology, more urgent requirements for efficient, mobile, and diverse communication are proposed, and non-terrestrial network (NTN) technology emerges as the times require. Compared with a terrestrial mobile communication network, in the NTN, communication equipment such as a satellite is used to participate in network deployment technology to achieve truly global network coverage, and the advantages and strategic importance of development are self-evident.

[0068] Satellite communication systems and 5G are integrated with each other, complement each other's advantages and disadvantages, and jointly constitute a global seamless coverage of sea, land, air, and sky integrated communication network, which meets the needs of users for various services everywhere and is an important direction of future communication development. By introducing a satellite, communication services can be provided for areas such as oceans and forests that cannot be covered by a terrestrial communication network, and the reliability of 5G communication can be enhanced, for example, to ensure that airplanes, trains, and users on these vehicles obtain higher-quality communication services. In addition, more data transmission resources can be provided for 5G communication to improve the network rate. Therefore, simultaneously supporting communication between terrestrial and satellite, unmanned aerial vehicle, and other non-terrestrial base stations is an inevitable trend of future 5G communication, which has great benefits in terms of wide coverage, reliability, multi-connection, and high throughput. The current development of satellite mobile communication has two characteristics: 1) mobile terminal miniaturization: supporting various mobile communication terminals including handheld devices; and 2) communication service broadband: providing high-speed data services and Internet multimedia communication services in addition to traditional narrowband voice services.

[0069] For example, FIG. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application. As shown in FIG. 1, in a new radio (NR) and NTN integrated communication network, a terrestrial terminal accesses a 5G new air interface network, and a 5G base station is deployed on a satellite and connected to a core network on the ground through a wireless link. At the same time, there is a wireless link between satellites to complete signaling interaction and user data transmission between base stations. The various network elements in FIG. 1 and their interfaces are described as follows:

[0070] Terminal: can also be referred to as terminal device, user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, access terminal (access terminal), user unit (user unit), user station (user station), mobile station (mobile station), mobile (mobile), remote station (remote station), remote terminal (remote terminal), mobile device (mobile equipment), user terminal (user terminal), wireless communication device (wireless telecom equipment), user agent (user agent), user equipment (user equipment) or user device.

[0071] A terminal can be a device that provides voice and / or data connectivity to a user, such as a handheld phone, a car-mounted device, etc. Examples of terminals include mobile phones, tablet computers, notebook computers, palm computers, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless connectivity, computing devices or other processing devices connected to wireless modems, wearable devices, terminals in 5G networks, or terminals in future evolved public land mobile networks (PLMNs), etc. Embodiments of the present application are not limited in this regard.

[0072] By way of example, and without limitation, a terminal device can also be an IoT node. IoT is an important component of future information technology development, and its main technical feature is to connect things through communication technology and network, so as to realize the interconnection of man-machine and the intelligent network of thing-thing. The connection can be through broadband technology or narrowband technology. IoT technology can achieve mass connection, deep coverage and terminal power saving through, for example, narrowband (NB) technology. IoT technology includes reflection communication technology, spread spectrum technology, ultra wide band (UWB), etc., and will not be described here.

[0073] By way of example and not limitation, in embodiments of the present application, the terminal device can also be a wearable device. The wearable device can also be referred to as a wearable smart device, which is a general term for devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes. The wearable device is a portable device that is directly worn on the body or integrated into the clothes or accessories of the user. The wearable device is not only a hardware device, but also has strong functions through software support and data interaction and cloud interaction. The general wearable smart device includes devices with full functions and large sizes, which can realize complete or partial functions without relying on a smart phone, such as smart watches or smart glasses, and devices that focus on a certain application function and need to be used in cooperation with other devices, such as smart phones, such as various smart wristbands and smart jewelry for monitoring vital signs.

[0074] In embodiments of the present application, the device for implementing the function of the terminal device can be a terminal device, or a device capable of supporting the terminal device to implement the function, such as a chip system. The device can be installed in the terminal device or used in cooperation with the terminal device. In embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0075] 5G base station: refers to a radio access network (RAN) node (or device) in a 5G network that accesses terminals to a wireless network, which can also be referred to as an access network device, a network device, or a gNB (gNB) that continues to evolve. It is mainly to provide wireless access services, schedule wireless resources for access terminals, provide reliable wireless transmission protocols and data encryption protocols, etc. The network device can be a node in the radio access network, which can also be referred to as a base station, and can also be referred to as a RAN node (or device). The network device can be an evolved Node B (eNB or eNodeB) in LTE; or a next generation Node B (gNB) in a 5G network or a base station in a future evolved public land mobile network (PLMN), broadband network gateway (BNG), convergence switch or non-3rd generation partnership project (3GPP) access device, etc. Optionally, the network device in the embodiments of the present application can include various forms of base stations, such as: macro base stations, micro base stations (also known as small stations), relay stations, access points, devices realizing base station functions in communication systems evolved after 5G, transmitting and receiving points (TRP), transmitting points (TP), mobile switching centers, and devices assuming base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, etc. It can also include centralized units (CU) and distributed units (DU) in cloud radio access network (C-RAN) systems, network devices in NTN communication systems, i.e., can be deployed on high-altitude platforms or satellites. The embodiments of the present application do not make specific limitations.

[0076] The base station deployed on the satellite in the present application can also be referred to as a satellite base station.

[0077] 5G core network: refers to the device in the core network (CN) of the 5G network that provides service support for terminal equipment, which is composed of multiple functional units. Mainly including user plane function (UPF) and control plane function in the data plane. Among them, the UPF is mainly responsible for forwarding packet data, quality of service (QoS) control, charging information statistics and connecting external networks. The control plane function is mainly responsible for service process interaction, issuing data packet forwarding strategy to the user plane, QoS control strategy, etc. Exemplarily, the network elements in the control plane function mainly include: mobility management function (AMF), session management function (SMF), policy control function (PCF), application function (AF), network exposure function (NEF), etc. The detailed concept of each network element can refer to the description in the related technology, which is not described here.

[0078] Ground station: responsible for forwarding signaling and service data between satellite base station and 5G core network.

[0079] 5G NR: wireless link between terminal and base station.

[0080] Xn interface: interface between 5G base stations and base stations, mainly used for signaling interaction such as handover.

[0081] NG interface: interface between 5G base station and 5G core network, mainly interacting with non-access layer (NAS) signaling of core network and user service data.

[0082] When the terminal device searches for a cell and completes downlink synchronization, the terminal device can determine the time-frequency resources of the candidate physical downlink control channel (PDCCH) used to schedule the broadcast message based on the information carried by the received synchronization signal block (SSB), and then the terminal device detects (also known as monitors) the PDCCH on the candidate time-frequency resources, and receives the broadcast message based on the DCI in the monitored PDCCH, to realize the access of the terminal.

[0083] In this application, the PDCCH scheduling the broadcast message is also called Type0-PDCCH.

[0084] The method of determining the candidate time-frequency resource of Type0-PDCCH by the terminal device based on the information carried by the received SSB is described as follows:

[0085] Firstly, the terminal device obtains O and M based on the index indicated by the master information block (MIB) message in the received SSB.

[0086] For example, Table 1 shows the relationship between the index indicated by the MIB message in the SSB, O and M when the relative position relationship between the SSB and PDCCH is pattern 1* in the FR1 (less than 6G) frequency band.

[0087] Table 1

[0088] The first column of Table 1 is the index indicated by the MIB message in the SSB. The terminal device can determine O and M based on the index indicated by the MIB message in the SSB. For example, when the index indicated by the MIB message in the SSB is 0, the terminal device determines O as 0 and M as 1. For another example, when the index indicated by the MIB message in the SSB is 15, the terminal device determines O as 5 and M as 1.

[0089] Further, after the terminal device determines O and M based on the index indicated by the MIB message in the SSB, the terminal device can further determine the slot of the monitored Type0-PDCCH according to formula (I), also known as determining the search space of Type0-PDCCH.

[0090] Wherein, μ represents the configuration of subcarrier spacing (SCS), represents the number of slots included in one radio frame (or system frame), and i is the SSB index of the received SSB, represents the result of multiplying M and rounding down, and the concepts of O and M can be referred to the foregoing description and will not be described here.

[0091] For example, after the terminal device determines the slot n0 based on the received SSB and formula (I), for a system with subcarrier spacing of 15 kilo hertz (KHZ), 30 KHZ, 70 KHZ, or 120 KHZ (subcarrier spacing = 15*2^μ), the terminal device determines that the search space of the Type0-PDCCH corresponding to the received SSB is the slot n0 and the slot n0+1. That is, the Type0-PDCCH corresponding to the received SSB can be on the slot n0 or on the slot n0+1, and then the terminal device monitors the Type0-PDCCH corresponding to the SSB on the slot n0 or the slot n0+1 in a blind detection manner.

[0092] It can be understood that, for the above formula (I), when the slot number calculated by the terminal device is greater than the number of slots included in a radio frame , the terminal device needs to calculate the slot number in the next radio frame.

[0093] After the terminal device determines the search space of the Type0-PDCCH, the terminal device can monitor the Type0-PDCCH in each slot included in the search space. Specifically, how to monitor in each slot included in the search space can be determined based on Table 1, and specifically:

[0094] The last column of Table 1 indicates the starting symbol when the terminal device monitors the Type0-PDCCH in each slot in the search space of the Type0-PDCCH, that is, from which symbol the terminal device starts to monitor the Type0-PDCCH in the monitored slot. As shown in Table 1, when M is equal to 1 / 2, there are two starting symbols: {0, if i is even}, and {1, if i is odd}. The starting symbols of the Type0-PDCCH corresponding to the even and odd i are staggered i represents the index of the (synchronization signal block, SSB) received by the terminal device, , which represents the number of symbols occupied by one Type0-PDCCH. In this application, the index of the SSB is also referred to as the SSB index.

[0095] The third column of Table 1 indicates the number of time domain resources selected by the terminal device when monitoring the Type0-PDCCH in each slot in the monitored slot. For example, when M is equal to 1 / 2, the number of candidate time domain resources is 2. For example, when M = 1 / 2, if i = 0, the terminal device needs to blind detect in the two candidate time domain resources. If i = 1, the terminal device needs to blind detect in the two candidate time domain resources. If i = 1, the terminal device needs to blind detect in the two candidate time domain resources.

[0096] In addition, it can be understood that when M = 1 / 2, n0 determined by the terminal device based on SSBs with two different SSB indexes can be the same. For example, the SSB with SSB index i = 0 is referred to as SBB0, and the SSB with SSB index i = 1 is referred to as SBB1. When M = 1 / 2, n0 calculated by the terminal device based on SBB0 and SBB1 is the same. However, when i = 0, the terminal device monitors the Type0-PDCCH corresponding to SBB0 in the symbol included in each slot of the search space, and when i = 1, the terminal device monitors the Type0-PDCCH corresponding to SBB1 in the symbol included in each slot of the search space. It can be seen that the candidate time domain resources of the Type0-PDCCH determined by the terminal device based on SBB0 and SBB1 are partially overlapped.

[0097] However, it should be noted that since the Type0-PDCCH corresponding to one SSB index is only transmitted once, the network device can make the Type0-PDCCHs corresponding to the two SSBs actually occupy different time domain resources through scheduling. For example, FIG. 2 shows a schematic diagram of the time domain resources actually occupied by the Type0-PDCCHs corresponding to SBB0 and SBB1 when M = 1 / 2. As shown in FIG. 2, there are 28 grids, one grid represents one symbol, and the number in each grid represents the index of the symbol. There are a total of 28 symbols, that is, 2 slots, which are the determined search space (slot n0 and slot n0+1), The symbol 0-symbol 3 of two time slots represent the candidate time domain resources of the Type0-PDCCH corresponding to SSB0, and the symbol 2-symbol 5 represent the candidate time domain resources of the Type0-PDCCH corresponding to SSB1. The box filled with gray represents the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB0, and the part filled with shadow represents the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB1. As shown in (a) of FIG. 2, the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB0 are symbol 0 and symbol 1 in the time slot n0, and the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB1 are symbol 2 and symbol 3 in the time slot n0. As shown in (b) of FIG. 2, the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB0 are symbol 2 and symbol 3 in the time slot n0, and the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB1 are symbol 4 and symbol 5 in the time slot n0. As shown in (c) of FIG. 2, the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB0 are symbol 0 and symbol 1 in the time slot n0, and the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB1 are symbol 2 and symbol 3 in the time slot n0+1. It can be seen that the actual occupied time domain resources of the Type0-PDCCH corresponding to SSB0 and SSB1 are different respectively.

[0098] Based on the above description, it can be seen that one SSB currently corresponds to one Type0-PDCCH. However, in some communication systems with large round trip time (RTT), such as the satellite communication system shown in FIG. 1, the path loss is relatively large, and the link budget of the PDCCH is relatively poor. At this time, there may be a case that the terminal device cannot successfully parse the DCI carried in the Type0-PDCCH, which affects the access of the terminal device to the network.

[0099] Therefore, embodiments of the present application provide a communication method and related apparatus. In the communication method provided by the present application, one SSB can correspond to multiple Type0-PDCCHs. In this way, the network device can send the DCI corresponding to the sent SSB based on receiving multiple PDCCHs, and correspondingly, the terminal device parses the DCI corresponding to the SSB based on receiving multiple PDCCHs, thereby improving the probability of successful parsing of the DCI by the terminal device, and thereby improving the probability of successful access by the terminal.

[0100] In the following, the communication method and communication apparatus provided by the present application will be described in detail in combination with the drawings.

[0101] FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application. FIG. 3 is merely an example of the method from the perspective of the interaction between the network device and the terminal device, and should not constitute any limitation on the embodiments of the present application. The network device in FIG. 3 can be replaced by a component (such as a chip, a chip system, a processor, etc.) configured in the network device, or a logic module or software capable of realizing all or part of the functions of the network device; the terminal device in FIG. 3 can be replaced by a component (such as a chip, a chip system, a processor, etc.) configured in the terminal device, or a logic module or software capable of realizing all or part of the functions of the terminal device.

[0102] The method shown in FIG. 3 includes S310 to S320. The following describes each step in the method 300 in detail.

[0103] S310, the network device sends an SSB to a terminal device; correspondingly, the terminal device receives the SSB sent by the network device.

[0104] In this embodiment, after receiving the SSB sent by the network device, the terminal device can obtain O and M based on the index indicated in the MIB message in the received SSB, and then determine the slot n0 based on the index of the received SSB, the determined O and M, and the formula (I) above, so as to obtain the PDCCH corresponding to the SSB based on the slot n0. How to obtain the PDCCH corresponding to the SSB based on the slot n0 will be described in detail in step S320.

[0105] In this embodiment, the determined slot n0 is also referred to as the first slot. Wherein, how the terminal device obtains O and M based on the index indicated in the MIB message in the received SSB, and the implementation manner of determining the slot n0 can refer to the description in the foregoing, which will not be described herein.

[0106] It should be noted that in this embodiment, after determining the slot n0, the terminal device determines the slot n0 as the search space of the Type0-PDCCH corresponding to the received SSB. That is, the difference between the present embodiment and the prior art is that in the prior art, the terminal device monitors the search space of the Type0-PDCCH corresponding to the received SSB as the slot n0 and the slot n0+1, while in the present embodiment, the terminal device monitors the search space of the Type0-PDCCH corresponding to the received SSB as the slot n0 (i.e., excluding the slot n0+1).

[0107] S320, the network device sends K PDCCHs associated with the SSB, each of the K PDCCHs being used for scheduling a broadcast message, correspondingly, the terminal device receives the K PDCCHs associated with the SSB based on the first slot, the first slot being obtained based on the received SSB, and K is a positive integer greater than 1.

[0108] In this embodiment, the SSB is associated with K PDCCHs, wherein each of the K PDCCHs associated with the SSB is a PDCCH for scheduling a broadcast message. That is, each of the K PDCCHs is the Type0-PDCCH described above.

[0109] Specifically, K is a positive integer greater than 1. That is, in this embodiment, there are two or more Type0-PDCCHs associated with the SSB.

[0110] It can be understood that the K PDCCHs associated with the SSB can also be referred to as K PDCCHs corresponding to the SSB, or can also be referred to as K PDCCHs related to the SSB.

[0111] It can be understood that the K PDCCHs occupy different time domain resources in the time domain. Specifically, in this embodiment, when the network device transmits the K PDCCHs, the time domain resources occupied by the K PDCCHs include a first time domain resource, and the first time domain resource is a time domain resource occupied by a certain PDCCH transmitted by the network device in a first time slot among the K PDCCHs. That is, the time domain resources occupied by the K PDCCHs include the time domain resources occupied by a certain PDCCH transmitted by the network device in the first time slot.

[0112] Optionally, the frequency domain resources occupied by the K PDCCHs are the same. That is, when the network device transmits the K PDCCHs associated with the SSB, the K PDCCHs occupy the same frequency domain resources in the frequency domain and different time domain resources in the time domain.

[0113] In this embodiment, after the network device transmits the K PDCCHs associated with the SSB, the terminal device receives the K PDCCHs according to the first time slot. It can be understood that in the technical solution provided in this embodiment, in this way, the network device can transmit the DCI corresponding to the transmitted SSB based on receiving multiple PDCCHs, and the terminal device can analyze the DCI corresponding to the SSB based on receiving multiple PDCCHs, thereby improving the probability of successful analysis of the DCI by the terminal device, and thereby improving the probability of successful access by the terminal.

[0114] Next, the implementation manner of the K PDCCHs corresponding to the SSB occupying different time domain resources and how the terminal device receives the K PDCCHs associated with the SSB according to the first time slot is described in detail.

[0115] In an embodiment one, time domain resources occupied by different PDCCHs of the K PDCCHs are located in different time slots of the K time slots, the K PDCCHs carry the same DCI, the DCI is the DCI corresponding to the SSB, and the time domain resources occupied by the K PDCCHs in the respective time slots include the same symbols.

[0116] In the embodiment one, the time domain resources occupied by different PDCCHs of the K PDCCHs are located in different time slots of the K time slots, which can be explained as follows: one PDCCH corresponds to one time slot, and different PDCCHs of the K PDCCHs correspond to different time slots in the time domain. For example, K is equal to 2, that is, the SSB is associated with two PDCCHs, one of which is transmitted in time slot n0, and the other PDCCH occupies time slot n0+1.

[0117] In the embodiment one, the time domain resources occupied by different PDCCHs of the K PDCCHs are located in different time slots of the K time slots, which can be explained as follows: one PDCCH corresponds to one time slot, and different PDCCHs of the K PDCCHs correspond to different time slots in the time domain. For example, K is equal to 2, that is, the SSB is associated with two PDCCHs, one of which is transmitted in time slot n0, and the other PDCCH occupies time slot n0+1.

[0118] Optionally, the K time slots are consecutive K time slots.

[0119] When the network device transmits the K PDCCHs based on the embodiment one, for the terminal device, receiving the K PDCCHs associated with the SSB according to the first time slot includes that the terminal device receives the K PDCCHs on the same time domain resources in the K time slots starting from the first time slot. For example, taking FIG. 4 as an example, after the terminal device receives the first PDCCH on the third symbol and the fourth symbol of time slot n0, the terminal device receives the second PDCCH on the third symbol and the fourth symbol of time slot n0+1.

[0120] Optionally, in an implementation manner of the embodiment one, the repetition number K can be predefined by a protocol, or the network device can indicate the K to the terminal device.

[0121] It can be seen that in the first implementation, the network device transmits the K PDCCHs associated with the SSB received by the terminal device in different slots, and the DCI carried by the PDCCH transmitted in each slot is also the same, that is, the network device can be considered to repeatedly transmit the DCI corresponding to the SSB in K slots. Correspondingly, the terminal device receives the K PDCCHs transmitted by the network device in the K slots. That is, in this implementation, the repeated transmission improves the link budget when transmitting the DCI corresponding to the SSB, so as to improve the probability of successful parsing of the DCI by the terminal device, and further improve the probability of successful access by the terminal.

[0122] In the second implementation, the time domain resources occupied by different PDCCHs in the K PDCCHs are located in different slots in the K slots, the DCI carried by the K PDCCHs is the same, and the starting symbols of the time domain resources occupied by part or all of the PDCCHs in the K PDCCHs in the respective corresponding slots are different.

[0123] That is, in the second implementation, one PDCCH in the K PDCCHs corresponds to one slot, and the K PDCCHs correspond to K slots in total.

[0124] It can be understood that the starting symbols of the time domain resources occupied by part or all of the PDCCHs in the K PDCCHs in the respective corresponding slots are different, that is, it can be explained that the positions of the time domain resources occupied by part or all of the PDCCHs in the K PDCCHs in the respective corresponding slots are different.

[0125] When the network device transmits the K PDCCHs based on the first implementation, for the terminal device, receiving the K PDCCHs associated with the SSB based on the first slot includes: after the terminal device obtains the starting symbols of the time domain resources occupied by each PDCCH in the K PDCCHs, the terminal device receives in the K slots based on the starting symbols of the time domain resources occupied by the K PDCCHs. Wherein, the K slots here are determined based on the first slot, for example, the terminal device determines the first slot and the next K-1 continuous slots as the K slots for receiving the K PDCCHs.

[0126] It is again pointed out that the present embodiment does not limit the way in which the terminal device determines the repetition number K. For example, one implementation is that the repetition number K is pre-defined by the protocol, and another implementation is that the network device configures the terminal device.

[0127] Optionally, the network device can send the terminal device first information, the first information being used for indicating starting symbols of time domain resources occupied by each of the K PDCCHs. That is, the first information can be considered as being used for indicating corresponding starting symbols when receiving PDCCHs in each of the K slots for receiving the K PDCCHs. As an example, when K is equal to 2, the network device indicates information to the terminal device as shown in Table 2, the last column of Table 2 can be considered as the first information in this embodiment. At this time, for the terminal device, the slot n0 is obtained based on O and M in Table 2, and then the two PDCCHs to be received on the slot n0 and the slot n0+1 are determined according to the last column in Table 2, and the starting symbol bit K0 of the time domain resources occupied by the PDCCH transmitted in the slot n0, and the starting symbol bit K1 of the time domain resources occupied by the PDCCH transmitted in the slot n0+1, so that the two PDCCHs transmitted on the slot n0 and the slot n0+1 are received.

[0128] Table 2

[0129] For example, K=2, the SSB is associated with two PDCCHs, each PDCCH occupies a total of 2 symbols (also referred to as the length of the PDCCH being 2), at this time, if K0=3 and K1=5, it means that one of the PDCCHs is on the 3rd symbol and the 4th symbol of the slot n0, and the other PDCCH is on the 5th symbol and the 6th symbol of the slot n0+1.

[0130] It can be understood that in this embodiment, the K PDCCHs can also be considered as being repeated among the K slots, so that the link budget can be improved, thereby improving the decoding performance of the terminal device. The difference between this embodiment and the first embodiment is that in the first embodiment, the time domain resources occupied by the K PDCCHs in the corresponding slots include the same symbols, that is, the positions of the time domain resources occupied by the K PDCCHs in the corresponding slots are the same, while in this embodiment, the starting symbols of the time domain resources occupied by part or all of the K PDCCHs in the corresponding slots are different, that is, the positions of the time domain resources occupied by the part or all of the K PDCCHs in the corresponding slots are different.

[0131] Embodiment three: different PDCCHs in the K PDCCHs carry different contents in the DCI corresponding to the SSB, the time domain resources occupied by the different PDCCHs in the K PDCCHs are located in different slots, and the time domain resources occupied by the K PDCCHs in the respective corresponding slots include the same symbols.

[0132] In an implementation, the network device can divide the DCI corresponding to the SSB into K different code blocks (CBs), then encode the K code blocks (CBs) respectively to obtain K sets of encoded bits corresponding to the K CBs, and then send the K sets of encoded bits on the same time domain resources in K time slots; correspondingly, the terminal device first decodes the K PDCCHs received from the K time slots respectively, and then obtains the DCI based on the results of decoding the K PDCCHs respectively. That is, in this implementation, the K PDCCHs occupy K time slots, different PDCCHs carry encoded bits obtained after encoding different CBs, and each of the different CBs is included in the DCI corresponding to the SSB.

[0133] For example, K is equal to 2, the two split CBs are called CB1 and CB2, CB1 = ceil(TB / 2), and CB2 = TB-CB1; then the network device encodes CB1 and CB2 respectively and places them on the same time-frequency resource position in time slot n0 and time slot n0+1. Correspondingly, the terminal device determines time slot n0, and can receive two PDCCHs in time slot n0 and time slot n0+1, then decodes the two PDCCHs respectively; and then splices the results obtained by decoding the two PDCCHs respectively to obtain the DCI corresponding to the SSB.

[0134] In another implementation, the network device can first encode the DCI corresponding to the SSB to obtain target encoded bits, then divide the target encoded bits into K parts and send them on the same time domain resources in K time slots, where different PDCCHs in the K PDCCHs carry different parts. Correspondingly, the terminal device obtains the target encoded bits from the K PDCCHs received from the K time slots; and decodes the target encoded bits to obtain the DCI. That is, in this implementation, the time domain resources carrying the DCI are the sum of the time domain resources occupied by the PDCCHs in the K time slots, and the network device encodes the DCI corresponding to the SSB according to the sum of the time domain resources occupied by the PDCCHs in the K time slots, that is, the network device can be considered to associate the encoding of the DCI corresponding to the SSB on the K time slots, and then send it on the corresponding time domain resources in different time slots.

[0135] For example, K is equal to 2, the network device associates the encoding of the DCI corresponding to the SSB on time slot n0 and time slot n0+1. Correspondingly, the terminal device determines time slot n0, and can receive two PDCCHs in time slot n0 and time slot n0+1, then splices the two PDCCHs, and then decodes the spliced result to obtain the DCI corresponding to the SSB.

[0136] It can be seen that the difference between the two implementation manners is that, in the first implementation manner, the terminal device decodes each PDCCH first and then splices to obtain the DCI corresponding to the SSB (decoding first and then splicing), and in the second implementation manner, the terminal device splices each received PDCCH first and then decodes based on the splicing result to obtain the DCI corresponding to the SSB (splicing first and then decoding).

[0137] In this embodiment three, K can be predefined by a protocol, or can also be indicated by the network device to the terminal device.

[0138] It can be understood that, in this embodiment three, since the DCI is carried through the K PDCCHs, that is, the total resources of the K slots are used to reduce the code rate of the DCI, the decoding performance of the terminal device is improved.

[0139] In addition, it needs to be noted that, for the above-mentioned embodiments one to three, the time domain resources occupied by the PDCCHs corresponding to different SSBs need to be staggered. If the slots included in the search spaces of SSB0 and SSB1 are the same, the time domain resources occupied by the PDCCHs corresponding to different SSBs can be staggered through the positions of the symbols. The time domain resources occupied by the PDCCHs corresponding to different SSBs need to be staggered can also be explained as that the PDCCHs corresponding to different SSBs need to occupy different time domain resources, and the time domain resources occupied by the PDCCHs corresponding to different SSBs do not overlap.

[0140] Embodiment four: the DCI carried by the K PDCCHs is the same, and the DCI is the DCI corresponding to the SSB; the K PDCCHs occupy different time domain resources in the first slot.

[0141] That is, in this embodiment four, the K PDCCHs are all located in the first slot, and the K PDCCHs occupy different time domain resources in the first slot. Therefore, it can also be considered that in this embodiment four, that is, it can be considered that the network device performs K times of repeated sending of the DCI corresponding to the SSB in the first slot, also called intra-slot repetition.

[0142] In specific implementation:

[0143] In the first implementation, when the network device repeats the DCI corresponding to the SSB K times in the first time slot, the network device sends second information to the terminal device; the second information is used to indicate the starting symbol of the time domain resource occupied by each of the K PDCCHs in the first time slot. Correspondingly, for the terminal device, the number of repetitions K (i.e., the number of starting symbols included in the second information) and the starting symbol of the time domain resource occupied by each of the K PDCCHs in the first time slot are obtained based on the second information of the network device, and then the K PDCCHs are received based on the starting symbols indicated by the second information in the first time slot.

[0144] For example, K=2, the length of the PDCCH is 2, and the SSB is associated with 3 PDCCHs, which are referred to as PDCCH1, PDCCH2, and PDCCH3, respectively. The network device can send second information to the terminal device to indicate the starting symbol, and the second information includes symbol indexes 0, K1, and K2. At this time, for the terminal device, after the first time slot is determined, the PDCCH1 is received on the symbol indexes 0-1, the PDCCH2 is received on the symbol indexes K1-K1+1, and the PDCCH3 is received on the symbol indexes K2-K2+1, starting from the symbol with the symbol index 0 in the first time slot.

[0145] In the second implementation, when the network device repeats the DCI corresponding to the SSB K times in the first time slot, the network device sends the K PDCCHs starting from a target symbol in the first time slot, and the PDCCHs are sent every P symbols, where P is the number of symbols occupied by any one of the K PDCCHs, i.e., P is equal to the length of the PDCCH. Correspondingly, after the terminal device determines the first time slot, the K PDCCHs are received in sequence every P symbols starting from the target symbol in the first time slot. Optionally, the network device indicates K to the terminal device.

[0146] The index of the target symbol may be, for example, agreed by a protocol. Alternatively, the network device can indicate the target symbol to the terminal device. For example, the target symbol is the first symbol (starting symbol) in the first time slot, i.e., the symbol with the symbol index 0.

[0147] For example, the target symbol is the symbol with the symbol index 0, the length of the PDCCH is 2, the network device sends second information to the terminal device, and the second information is used to indicate K=2. At this time, after the terminal device receives K, the first PDCCH is received on the first and second symbols in the first time slot, and the second PDCCH is received on the third and fourth symbols in the first time slot, starting from the symbol with the symbol index 0 in the first time slot.

[0148] In the third implementation manner: if the index of the SSB is even, the starting symbol of the time domain resource occupied by the i-th PDCCH in the K PDCCHs in the first slot is wherein, i is from 1 to K, and the number of symbols occupied by any one of the K PDCCHs is represented by L. If the index of the SSB is odd, the starting symbol of the time domain resource occupied by the i-th PDCCH in the K PDCCHs in the first slot is i is from 1 to K. wherein, i is from 1 to K, and the number of symbols occupied by any one of the K PDCCHs is represented by L. If the index of the SSB is odd, the starting symbol of the time domain resource occupied by the i-th PDCCH in the K PDCCHs in the first slot is

[0149] That is, if the index of the SSB is even, the starting symbol of the time domain resource occupied by the K PDCCHs in the first slot is: If the index of the SSB is odd, the starting symbol of the time domain resource occupied by the K PDCCHs in the first slot is:

[0150] It can be understood that, through the implementation manner, the K PDCCHs corresponding to the SSB with an even index can be in the first half of the first slot, and the K PDCCHs corresponding to the SSB with an odd index can be in the second half of the first slot, that is, the PDCCH corresponding to the SSB with an odd index and the PDCCH corresponding to the SSB with an odd index are offset by half a slot in the time domain resource.

[0151] In the fourth implementation manner: if the index of the SSB is even, the starting symbol of the time domain resource occupied by the k-th PDCCH in the K PDCCHs in the first slot is wherein, k is from 1 to K, and the number of symbols occupied by any one of the K PDCCHs is represented by L.

[0152] If the index of the SSB is odd, the starting symbol of the time domain resource occupied by the j-th PDCCH in the K PDCCHs is wherein, j is from 1 to K, and the number of symbols occupied by any one of the K PDCCHs is represented by L, and L represents the number of PDCCHs associated with the SSB with an even index.

[0153] Optionally, the network device indicates K to the terminal device. Optionally, L = K.

[0154] That is, if the index of the SSB is even, the starting symbol of the time domain resource occupied by the K PDCCHs in the first slot is: If the index of the SSB is odd, the starting symbol of the time domain resource occupied by the K PDCCHs in the first slot is:

[0155] Optionally, for the third implementation and the fourth implementation, the rule of how the K PDCCHs occupy different time domain resources in the first slot can be predefined, for example, the K PDCCHs are predefined to occupy the time domain resources according to the rule in the third implementation, or the K PDCCHs are predefined to occupy the time domain resources according to the rule in the fourth implementation. At this time, the network device can only indicate K to the terminal device.

[0156] Since the existing index table (Table 1) is redundant in the scenario with poor link budget and is actually not used much. Therefore, when the network device indicates K to the terminal device, the size of the table can be reduced, and the extra bits can be used to indicate K. For example, in an implementation, the indication information (for example, referred to as repetition number indication information) for indicating K can be 2 bits in the SearchSpaceZero4 information in the pdcch-ConfigSIB1 domain in the MIB. That is, 2 bits in the SearchSpaceZero4 information in the pdcch-ConfigSIB1 domain in the MIB are used to indicate K, and the remaining 2 bits are used to indicate the time domain resources occupied by the PDCCH. Optionally, the time domain resources occupied by the PDCCH indicated by the remaining 2 bits can be newly defined to correspond to only 4 indexes, or the time domain resources occupied by the PDCCH indicated by the remaining 2 bits can correspond to a subset in the existing table 1. In another implementation, two bits in each of the controlResourceSetZero and the time domain ControlResourceSetZero in the pdcch-ConfigSIB1 domain indicating the PDCCH frequency domain information are used to indicate K, and the time domain and frequency domain positions can be a newly defined table with only 8 indexes, or 3 bits can be used to indicate a subset in the existing table.

[0157] It can be seen that in this fourth embodiment, the DCI in the K PDCCHs is concentrated in the same first slot, that is, the K times of repeated sending of the DCI are performed in the first time limit, so that the delay of PDCCH decoding can be reduced, thereby improving the decoding performance of the terminal device, and further improving the probability of successful access of the terminal device.

[0158] Next, a schematic flowchart of another communication method provided by the embodiments of the present application is described. In this communication method, the method is described from the perspective of interaction between a network device and a terminal device, and should not constitute any limitation on the embodiments of the present application. The network device in the method can be replaced by a component (such as a chip, a chip system, a processor, etc.) configured in the network device, or a logic module or software capable of realizing all or part of the functions of the network device; the terminal device in the method can be replaced by a component (such as a chip, a chip system, a processor, etc.) configured in the terminal device, or a logic module or software capable of realizing all or part of the functions of the terminal device.

[0159] Next, each step in the method is described in detail.

[0160] Step 1: The network device sends an SSB to the terminal device; correspondingly, the terminal device receives the SSB sent by the network device.

[0161] Step 2: The terminal device determines a first time slot based on the received SSB.

[0162] In this embodiment, after receiving the SSB sent by the network device, the terminal device can obtain O and M based on the index indicated by the MIB message in the received SSB, and then determine the first time slot based on the index of the received SSB, O and M, and then determine the first time slot based on formula (two) to receive the PDCCH corresponding to the SSB based on the first time slot. Formula (two) is as follows:

[0163] Wherein, n0 represents the first time slot, i represents the index of the received SSB, and represents the number of time slots included in one radio frame. The concepts of O, M and i can be referred to the description in formula (one) above, and will not be described here.

[0164] Wherein, for the implementation of how the terminal device obtains O and M based on the index indicated by the MIB message in the received SSB, and determines the time slot n0, reference can be made to the description above, and will not be described here.

[0165] Step 3: The network device sends K PDCCHs associated with the SSB, each of the K PDCCHs is used to schedule a broadcast message, correspondingly, the terminal device receives the K PDCCHs associated with the SSB based on the first time slot; wherein K is related to M.

[0166] In this embodiment, the time domain resources occupied by different PDCCHs in the K PDCCHs are located in different time slots in the K time slots, and the DCI carried by the K PDCCHs is the same, which is the DCI corresponding to the SSB. That is, the DCI corresponding to the SSB is repeated K times in this embodiment.

[0167] Specifically, in this embodiment, if the terminal device determines the first time slot based on formula (two), when M = 1 / 2, the SSBs corresponding to different i differ by 1 time slot in the time domain; when M = 1, the SSBs corresponding to different i differ by 2 time slots in the time domain; and when M = 4, the SSBs corresponding to different i differ by 2 time slots in the time domain.

[0168] Therefore, in this embodiment, if M = 1, then the SSB transmitted by the network device is associated with 2 PDCCHs, that is, K = 2, and the repetition is 2 times; if M = 2, then the SSB transmitted by the network device is associated with 4 PDCCHs, that is, K = 4, and the repetition is 4 times; and if M = 1 / 2, then the SSB transmitted by the network device is associated with 2 PDCCHs, that is, K = 1, that is, the DCI associated with the SSB is transmitted only once and is not repeated. Correspondingly, for the terminal device, when the first time slot is determined based on formula (two), the number of repetitions is determined based on M, and then the K PDCCHs are received according to the first time slot and the number of repetitions.

[0169] In an implementation manner, the time domain resources occupied by the K PDCCHs in the respective time slots include the same symbols. Correspondingly, the terminal device receives the K PDCCHs one by one at the same symbol positions in the first time slot and the K-1 time slots after the first time slot. For example, the starting symbols of the time domain resources occupied by the K PDCCHs in the respective time slots are 0.

[0170] In another implementation manner, the time domain resources occupied by the K PDCCHs in the respective time slots include different starting symbols. Optionally, in this implementation manner, the network device can indicate the starting symbols of the time domain resources occupied by the K PDCCHs in the respective time slots to the terminal device. Correspondingly, the terminal device receives the K PDCCHs one by one from the corresponding starting symbol positions in the first time slot and the K-1 time slots after the first time slot.

[0171] It can be seen that in the communication method provided in this embodiment, after the terminal device determines the first time slot based on formula (two), because the time slots corresponding to different M differ by 1 time slot, 2 time slots, or 4 time slots in the time domain, the DCI corresponding to the SSB can be repeated in the different time slots in the case of a difference of 2 time slots or 4 time slots, so that the probability of successfully parsing the DCI by the terminal device can be improved, and thus the probability of successful access by the terminal can be improved.

[0172] The transmission method of the embodiment of the present application is described in detail above, and the communication apparatus provided by the embodiment of the present application will be described in detail below with reference to FIG. 5 and FIG. 6.

[0173] FIG. 5 is a structural schematic diagram of a communication apparatus provided in an embodiment of the present application. Specifically, as shown in FIG. 5, the apparatus 500 includes a processing module 501 and a transceiver module 502.

[0174] For example, in an embodiment, the apparatus 500 can be applied to a terminal device.

[0175] For example, the processing module 501 is configured to acquire a first time slot, the first time slot being determined based on a received SSB.

[0176] The transceiver module 502 is configured to receive K PDCCHs associated with the SSB based on the first time slot, wherein each of the K PDCCHs is used to schedule a broadcast message, and K is a positive integer greater than 1.

[0177] Optionally, the K PDCCHs carry the same DCI, different PDCCHs of the K PDCCHs occupy time domain resources in different time slots, and the DCI is a DCI corresponding to the SSB.

[0178] Optionally, the time domain resources occupied by the K PDCCHs in the respective corresponding time slots include the same symbols.

[0179] Optionally, the time domain resources occupied by part or all of the K PDCCHs in the respective corresponding time slots have different starting symbols.

[0180] Optionally, the transceiver module 502 is further configured to receive first information, the first information being used to indicate the starting symbols of the time domain resources occupied by each of the K PDCCHs.

[0181] Optionally, different PDCCHs of the K PDCCHs carry different contents in a downlink control information DCI, different PDCCHs of the K PDCCHs occupy time domain resources in different time slots, and the DCI is a DCI corresponding to the SSB.

[0182] Optionally, the processing module 501 is further configured to decode the K PDCCHs respectively, and obtain the DCI based on the results of decoding the K PDCCHs respectively.

[0183] Optionally, the processing module 501 is further configured to obtain target coded bits from the received K PDCCHs, the target coded bits being coded bits obtained after coding the DCI, and decode the target coded bits to obtain the DCI.

[0184] Optionally, the K PDCCHs carry the same downlink control information DCI, the DCI is a DCI corresponding to the SSB, and the K PDCCHs occupy different time domain resources in the first time slot.

[0185] Optionally, the transceiver 502 is further configured to receive second information, the second information being used to indicate a starting symbol of time domain resources occupied by each of the K PDCCHs in the first time slot.

[0186] Optionally, a starting symbol of time domain resources occupied by any two of the K PDCCHs is separated by P symbols, P being equal to a number of symbols occupied by any one of the K PDCCHs.

[0187] Optionally, an index of the SSB is even, and a starting symbol of time domain resources occupied by an i-th PDCCH of the K PDCCHs in the first time slot is or, an index of the SSB is odd, and a starting symbol of time domain resources occupied by an i-th PDCCH of the K PDCCHs in the first time slot is i is from 1 to K; denotes the number of symbols occupied by any one of the K PDCCHs.

[0188] Optionally, an index of the SSB is odd, and a starting symbol of time domain resources occupied by a j-th PDCCH of the K PDCCHs is denotes the number of symbols occupied by any one of the K PDCCHs, L denotes a number of PDCCHs associated with an SSB with an even index, and j is from 1 to K.

[0189] For example, in two embodiments, the apparatus 500 can be applied to a network device.

[0190] For example, the transceiver 502 is configured to: transmit a synchronization signal block (SSB).

[0191] The transceiver 502 is further configured to: transmit K physical downlink control channels (PDCCHs) associated with the SSB, each of the K PDCCHs being used to schedule a broadcast message, K being a positive integer greater than 1.

[0192] Optionally, the K PDCCHs carry same downlink control information (DCI), time domain resources occupied by different PDCCHs of the K PDCCHs are located in different time slots, and the DCI is DCI corresponding to the SSB.

[0193] Optionally, time domain resources occupied by the K PDCCHs in respective time slots include same number of symbols.

[0194] Optionally, starting symbols of time domain resources occupied by part or all of the K PDCCHs in respective time slots are different.

[0195] Optionally, the transceiver 502 is further configured to send first information, the first information being used to indicate a starting symbol of a time domain resource occupied by each of the K PDCCHs.

[0196] Optionally, different PDCCHs in the K PDCCHs carry different contents in downlink control information (DCI), the time domain resources occupied by the different PDCCHs are located in different slots, and the DCI is DCI corresponding to the SSB.

[0197] Optionally, the K PDCCHs carry the same DCI, the DCI is DCI corresponding to the SSB, and the K PDCCHs occupy different time domain resources in the first slot.

[0198] Optionally, the transceiver 502 is further configured to send second information, the second information being used to indicate a starting symbol of a time domain resource occupied by each of the K PDCCHs in the first slot.

[0199] Optionally, the starting symbols of the time domain resources occupied by any two PDCCHs in the K PDCCHs are separated by P symbols, and P is equal to the number of symbols occupied by any one of the K PDCCHs.

[0200] Optionally, the index of the SSB is even, and the starting symbol of the time domain resource occupied by the i-th PDCCH in the K PDCCHs in the first slot is or, the index of the SSB is odd, and the starting symbol of the time domain resource occupied by the i-th PDCCH in the K PDCCHs in the first slot is i is from 1 to K; wherein, represents the number of symbols occupied by any one of the K PDCCHs.

[0201] Optionally, the index of the SSB is odd, and the starting symbol of the time domain resource occupied by the j-th PDCCH in the K PDCCHs is wherein, represents the number of symbols occupied by any one of the K PDCCHs, L represents the number of PDCCHs associated with the SSB with an even index, and j is from 1 to K.

[0202] FIG. 6 is a structural schematic diagram of another communication device provided by an embodiment of the present application. The device shown in FIG. 6 can be used to execute the method described in any one of the preceding embodiments.

[0203] As shown in FIG. 6, the apparatus 600 of the embodiment includes a memory 601 and a processor 602. In an implementation, the apparatus 600 further includes a communication interface 603 and a bus 604. The memory 601, the processor 602 and the communication interface 603 are communicatively connected with each other through the bus 604.

[0204] The memory 601 can be a read only memory (ROM), a static storage device, a dynamic storage device or a random access memory (RAM). The memory 601 can store a program, and when the program stored in the memory 601 is executed by the processor 602, the processor 602 is configured to execute each step of the method shown in FIG. 3.

[0205] The processor 602 can be a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC) or one or more integrated circuits for executing related programs to implement the method shown in FIG. 3 of the embodiments of the present application.

[0206] The processor 602 can also be an integrated circuit chip having a signal processing capability. In the implementation process, each step of the method of the embodiment of the present application shown in FIG. 5 can be completed by the integrated logic circuit of hardware or the instruction in the form of software in the processor 602.

[0207] The processor 602 mentioned above can also be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Each method, step and logic block diagram disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be a conventional processor or the like.

[0208] The steps of the method disclosed in the embodiments of the present application can be directly embodied as hardware code processing executed by a coded processor, or executed by a combination of hardware and software modules in the coded processor. The software modules can be located in the storage medium in the art, such as random storage, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the storage 601, and the processor 602 reads the information in the storage 601, and combines the hardware to complete the functions required by the units included in the device of the present application, for example, each step / function of the embodiment shown in FIG. 3 can be executed.

[0209] The communication interface 603 can use, but is not limited to, a transceiver such as a transceiver to realize the communication between the device 600 and other devices or communication networks.

[0210] The bus 604 can include a path for transmitting information between the various components (for example, the storage 601, the processor 602, the communication interface 603) of the device 600.

[0211] It should be understood that the device 600 shown in the embodiments of the present application can be an electronic device, or can also be a chip configured in an electronic device. The device 600 can be deployed in a terminal device, or can also be deployed in a network device.

[0212] The above embodiments can be realized all or partially by software, hardware, firmware or other any combination. When realized by software, the above embodiments can be realized in the form of a computer program product all or partially. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are all or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. The computer instructions can be stored in a computer readable storage medium, or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (for example, infrared, wireless, microwave, etc.) mode. The computer readable storage medium can be a computer accessible medium or a data storage device such as a server, data center and the like containing one or more available medium sets. The available medium can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), optical medium (for example, DVD), or semiconductor medium. The semiconductor medium can be a solid state disk.

[0213] It should be understood that the term "and / or" in this document is merely used to describe associated relationship, and it can mean three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In addition, the character " / " in this document generally means that the associated objects before and after the " / " are in an "or" relationship, but can also mean an "and / or" relationship, which can be understood according to the context before and after.

[0214] In this application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or the like means any combination of the items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0215] It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute a limitation on the implementation process of the embodiments of the present application.

[0216] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians 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.

[0217] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0218] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, multiple 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 shown or discussed objects can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0219] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may 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.

[0220] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0221] The functions, if realized in the form of software functional units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, the technical scheme of the present application or the part of the technical scheme that essentially contributes to the prior art or the part of the technical scheme can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and various media that can store program codes.

Claims

1. A communication method characterized by comprising: The method comprises: acquiring a first time slot, the first time slot being determined based on a received synchronization signal block (SSB); receiving K physical downlink control channels (PDCCHs) associated with the SSB based on the first time slot, wherein each of the K PDCCHs is used to schedule a broadcast message, and K is a positive integer greater than 1.

2. The method of claim 1, wherein, The K PDCCHs carry the same downlink control information (DCI), different PDCCHs in the K PDCCHs occupy time domain resources in different time slots, and the DCI corresponds to the SSB.

3. The method of claim 2, wherein, The time domain resources occupied by the K PDCCHs in the respective corresponding time slots include the same number of symbols.

4. The method of claim 2, wherein, The starting symbols of the time domain resources occupied by part or all of the K PDCCHs in the respective corresponding time slots are different.

5. The method of claim 4, wherein, The method further comprises: receiving first information, the first information being used to indicate the starting symbols of the time domain resources occupied by each of the K PDCCHs.

6. The method of claim 1, wherein, Different PDCCHs in the K PDCCHs carry different contents in the downlink control information (DCI), different PDCCHs in the K PDCCHs occupy time domain resources in different time slots, and the DCI corresponds to the SSB.

7. The method of claim 6, wherein, The method further comprises: decoding the K PDCCHs respectively; based on the result of decoding the K PDCCHs respectively, obtaining the DCI.

8. The method of claim 6, wherein, The method further comprises: obtaining target coded bits according to the received K PDCCHs, decoding the target coded bits to obtain the DCI.

9. The method of claim 1, wherein, The K PDCCHs carry the same downlink control information (DCI), the DCI corresponds to the SSB, and the K PDCCHs occupy different time domain resources in the first time slot.

10. The method of claim 9, wherein, The method further comprises: receiving second information, the second information being used to indicate the starting symbols of the time domain resources occupied by each of the K PDCCHs in the first time slot.

11. The method of claim 9, wherein, The starting symbols of the time domain resources occupied by any two PDCCHs in the K PDCCHs are spaced apart by P symbols, and P is equal to the number of symbols occupied by any one of the K PDCCHs.

12. The method of claim 9, wherein, The index of the SSB is even, and a starting symbol of time domain resources occupied by an i-th PDCCH of the K PDCCHs in the first slot is Alternatively, An index of the SSB is odd, and a starting symbol of time domain resources occupied by an i-th PDCCH of the K PDCCHs in the first slot is i is taken from 1 to K; wherein, represents the number of symbols occupied by any one of the K PDCCHs.

13. The method of claim 9, wherein, The index of the SSB is odd, and a starting symbol of a time domain resource occupied by the jth PDCCH of the K PDCCHs is wherein, represents the number of symbols occupied by any one of the K PDCCHs, L represents the number of PDCCHs associated with SSBs with even indexes, and j is taken from 1 to K.

14. A communication method, comprising: The method comprises: sending a synchronization signal block (SSB); sending K physical downlink control channels (PDCCHs) associated with the SSB, wherein each of the K PDCCHs is used to schedule a broadcast message, and K is a positive integer greater than 1.

15. The method of claim 14, wherein, The K PDCCHs carry the same downlink control information (DCI), different PDCCHs in the K PDCCHs occupy time domain resources in different time slots, and the DCI corresponds to the SSB.

16. The method of claim 15, wherein, The time domain resources occupied by the K PDCCHs in the respective corresponding time slots include the same number of symbols. The time domain resources occupied by the K PDCCHs in the respective corresponding time slots include the same number of symbols.

17. The method of claim 15, wherein, The starting symbol of the time domain resource occupied by part or all of the K PDCCHs in the respective corresponding time slots is different.

18. The method of claim 17, wherein, The method further comprises: sending first information, the first information being used to indicate the starting symbol of the time domain resource occupied by each of the K PDCCHs.

19. The method of claim 14, wherein, Different PDCCHs in the K PDCCHs carry different contents in downlink control information DCI, the time domain resources occupied by the different PDCCHs in the K PDCCHs are located in different time slots, and the DCI is DCI corresponding to the SSB.

20. The method of claim 14, wherein, The K PDCCHs carry the same downlink control information DCI, the DCI is DCI corresponding to the SSB, and the K PDCCHs occupy different time domain resources in the first time slot.

21. The method of claim 20, wherein, The method further comprises: sending second information, the second information being used to indicate the starting symbol of the time domain resource occupied by each of the K PDCCHs in the first time slot.

22. The method of claim 20, wherein, The starting symbols of the time domain resources occupied by any two PDCCHs in the K PDCCHs are spaced apart by P symbols, and P is equal to the number of symbols occupied by any one of the K PDCCHs.

23. The method of claim 20, wherein, The index of the SSB is even, and a starting symbol of time domain resources occupied by an i-th PDCCH of the K PDCCHs in the first slot is Alternatively, The index of the SSB is odd, and a starting symbol of time domain resources occupied by an i-th PDCCH of the K PDCCHs in the first slot is i is from 1 to K; wherein represents the number of symbols occupied by any one of the K PDCCHs.

24. The method of claim 20, wherein, The index of the SSB is odd, and a starting symbol of a time domain resource occupied by the jth PDCCH of the K PDCCHs is wherein represents the number of symbols occupied by any one of the K PDCCHs, L represents the number of PDCCHs associated with SSBs with even indexes, and j is from 1 to K.

25. A communications device, characterized by The computer program product comprises a computer program code, and when the computer program code runs on a computer, the computer implements the method as claimed in any one of claims 1 to 24.

26. A communications device, characterized by The computer program product comprises a computer program code, and when the computer program code runs on a computer, the computer implements the method as claimed in any one of claims 1 to 24.

27. A communications device, characterized by The computer program product comprises a computer program code, and when the computer program code runs on a computer, the computer implements the method as claimed in any one of claims 1 to 24. The computer program product comprises a computer program code, and when the computer program code runs on a computer, the computer implements the method as claimed in any one of claims 1 to 24. The computer program product comprises a computer program code, and when the computer program code runs on a computer, the computer implements the method as claimed in any one of claims 1 to 24.

28. A computer-readable storage medium, characterized in that, The computer program product comprises a computer program code, and when the computer program code runs on a computer, the computer implements the method as claimed in any one of claims 1 to 24.

29. A computer program product, characterised in that, ​ 30. A chip, characterized by ​

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