Communication method and related equipment

Abstract

The invention provides a communication method and related equipment, and relates to the technical field of communication. The method is applied to a network device, and comprises: indicating configuration information of a physical downlink control channel (PDCCH) of a target search space (SS), the configuration information comprising a maximum number of retransmission times; determining a retransmission time domain position of the SS PDCCH; and at the retransmission time domain position, repeatedly sending the SS PDCCH until the maximum retransmission frequency is reached. Therefore, the SS PDCCH is repeatedly sent for multiple times at the determined retransmission time domain position until the maximum retransmission frequency is reached, so that the corresponding transmission performance requirement can be met, the loss of wireless communication is reduced, the downlink coverage is enhanced, and the communication quality is improved.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a communication method and related devices. Background Art

[0002] Since traditional terrestrial networks cannot provide seamless coverage, especially in places where base stations cannot be deployed such as the sea, desert, and air, with the development of communication technologies, especially the continuous development of new generation mobile communication technologies such as the fifth generation mobile networks (abbreviated as 5G), satellite communication technologies have emerged as the times require.

[0003] Satellite communication technology refers to the communication technology in which radio communication devices on the ground use satellites as relays. A satellite communication system consists of a satellite part and a ground part. The ground part includes network devices such as base stations and terminals. Among them, the terminal can be a user equipment (UE). The base station can communicate with the terminal on the downlink or uplink. Specifically, the uplink refers to the link for the terminal to send data to the base station, and the downlink refers to the link for the base station to send data to the terminal. Each base station usually has a coverage range, also known as a coverage area.

[0004] In related technologies, in order to achieve seamless coverage of the network through satellite communication technology, the base station needs to simultaneously send multiple downlink beams. However, the base station cannot concentrate the energy in certain beams, so the signal energy cannot be concentrated, resulting in large losses in wireless communication and limited downlink coverage. Therefore, how to enhance downlink coverage and improve communication quality has become a key issue of concern in the industry. Summary of the Invention

[0005] The purpose of this application is to provide a communication method and related devices, which can enhance downlink coverage and improve communication quality.

[0006] In a first aspect, this application provides a communication method, which is applied to electronic devices such as base stations. The method includes: indicating configuration information of a physical downlink control channel (PDCCH) of a target search space (SS), where the configuration information includes maximum retransmission times information; determining an available retransmission time domain position of the PDCCH of the SS; and at the available retransmission time domain position, repeatedly sending the PDCCH of the SS according to the maximum retransmission times information. Thus, by repeatedly sending the SS PDCCH multiple times at the determined retransmission time domain position until the maximum retransmission times is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0007] In some specific implementation manners, the configuration information further includes initial transmission configuration information and / or transmission period information.

[0008] In some specific implementation manners, the length of the transmission period is the sum of a target number of time slots; a method for determining the transmission time domain position of the PDCCH of the SS includes: determining whether the starting time slot in the transmission period satisfies the following formula,

[0009] (2 μ ×10n f +n s )modT=Offset slot

[0010] where μ is the subcarrier spacing parameter, n f is the system frame number, n s is the time slot number within the radio frame, T is the transmission period, and offset slot is the period offset value; if it is satisfied, the time window determined by the starting time slot and the duration T is determined as the transmission period of the PDCCH of the SS; within the transmission period of the PDCCH of the SS, the initial transmission time domain position and / or the available retransmission time domain position of the PDCCH of the SS are determined. Thus, by repeatedly sending the SS PDCCH at the determined retransmission time domain position for multiple times until the maximum retransmission number is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0011] Optionally, the parameter μ of the subcarrier spacing within the above system frame can be specifically referred to in Section 4.2 of Protocol 3GPP TS 38.211, as shown in Table 1 below:

[0012] Table 1

[0013] μ <![CDATA[Δf = 2 μ ·15 [kHz]]]> Cyclic prefix 0 15 Normal 1 30 Normal 2 60 Normal, Extended 3 120 Normal 4 240 Normal 5 480 Normal 6 960 Normal

[0014] It can be seen from Table 1 that the above subcarrier spacing parameter μ can specifically be the values in Table 1 above.

[0015] In some specific implementation manners, within the transmission period of the PDCCH of the SS, determining the initial transmission time domain position of the PDCCH of the SS includes: within the transmission period of the PDCCH of the SS, taking the first transmission opportunity as the initial transmission time domain position of the PDCCH of the SS.

[0016] In some specific implementation manners, the target SS is the common search space CSS. Determining the available retransmission time domain positions of the PDCCH of the SS includes: determining a set of retransmission time domain positions of the PDCCH that retransmits the CSS; within the transmission period of the PDCCH of the CSS, determining the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions as the available retransmission time domain positions of the PDCCH of the CSS. Thus, by repeatedly transmitting the SS PDCCH multiple times at the determined retransmission time domain positions until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0017] In some specific implementation manners, the configuration information of the physical downlink control channel PDCCH indicating the target search space SS includes: indicating the configuration information of the PDCCH of the CSS through the first system information block SIB1 signaling or the radio resource control RRC signaling.

[0018] In some specific implementation manners, at the available retransmission time domain positions, repeating the transmission of the PDCCH of the SS according to the maximum number of retransmissions information includes: determining the initial transmission PDCCH candidate set of the PDCCH of the initial transmission CSS; at the available retransmission time domain positions, repeating the transmission of the PDCCH of the CSS according to the maximum number of retransmissions information and the retransmission PDCCH candidate set, and the retransmission PDCCH candidate set corresponds to the initial transmission PDCCH candidate set. Thus, resources can be saved and the blind detection complexity can be reduced.

[0019] In some specific implementation manners, at the available retransmission time domain positions, repeating the transmission of the PDCCH of the SS according to the maximum number of retransmissions information includes: determining the initial transmission SS of the PDCCH of the initial transmission CSS; at the retransmission time domain positions, repeating the transmission of the PDCCH of the CSS according to the maximum number of retransmissions information and the retransmission SS, and the PDCCH candidate sets of the retransmission SS and the initial transmission SS are the same. Thus, resources can be saved and the blind detection complexity can be reduced.

[0020] In some specific implementation manners, the configuration information further includes the frequency domain resource CORESET configuration information.

[0021] In some specific implementation manners, the target SS is a dedicated search space USS. Determining the available retransmission time domain positions of the PDCCH of the SS includes: determining the set of retransmission time domain positions of the PDCCH for retransmitting the USS according to the CORESET configuration information corresponding to the USS; and determining the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions as the available retransmission time domain positions of the PDCCH of the USS. Thereby, by repeatedly transmitting the SS PDCCH multiple times at the determined retransmission time domain positions until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0022] In some specific implementation manners, the configuration information indicating the physical downlink control channel PDCCH of the target search space SS includes: indicating the configuration information of the PDCCH of the USS through RRC signaling.

[0023] In a second aspect, the present application provides a communication method, which is applied to electronic devices such as mobile phones and computers. The method includes: receiving the configuration information of the physical downlink control channel PDCCH of the target search space SS, where the configuration information includes the maximum number of retransmissions; and repeatedly receiving the SS PDCCH at the retransmission time domain positions until the maximum number of retransmissions is reached. Thereby, by repeatedly receiving the SS PDCCH multiple times at the determined retransmission time domain positions until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0024] In some specific implementation manners, repeatedly receiving the PDCCH of the SS according to the maximum number of retransmissions information includes: if the signal quality of the PDCCH of the SS is less than or equal to the quality threshold, repeatedly receiving the PDCCH of the SS according to the maximum number of retransmissions information. Thereby, by repeatedly receiving the SS PDCCH multiple times at the determined retransmission time domain positions until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0025] In some specific implementation manners, the configuration information further includes initial transmission configuration information and / or transmission period information.

[0026] In some specific implementation manners, the length of the transmission period is the sum of the target number of time slots; the method for determining the transmission time domain position of the PDCCH of the SS includes: determining whether the starting time slot in the transmission period satisfies the following formula

[0027] (2 μ ×10n f +n s )modT=Offset slot

[0028] where μ is the subcarrier spacing parameter, n f is the system frame number, n s is the slot number within the radio frame, T is the transmission period, and offset slot is the period offset value; if satisfied, the time window determined by the starting slot and the duration T is determined as the transmission period of the PDCCH of the SS; within the transmission period of the PDCCH of the SS, the initial transmission time domain position and / or the available retransmission time domain position of the PDCCH of the SS are determined. Thus, by repeatedly receiving the SS PDCCH at the determined retransmission time domain position multiple times until the maximum retransmission number is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved. Thus, by repeatedly receiving the SS PDCCH at the determined retransmission time domain position multiple times until the maximum retransmission number is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0029] In some specific implementation manners, within the transmission period of the PDCCH of the SS, determining the initial transmission time domain position of the PDCCH of the SS includes: within the transmission period of the PDCCH of the SS, taking the first transmission occasion as the initial transmission time domain position of the PDCCH of the SS. Thus, by repeatedly receiving the SS PDCCH at the determined retransmission time domain position multiple times until the maximum retransmission number is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0030] In some specific implementation manners, when the target SS is the common search space CSS, determining the available retransmission time domain position of the PDCCH of the SS includes: determining the set of retransmission time domain positions for retransmitting the PDCCH of the CSS; within the transmission period of the PDCCH of the CSS, determining the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions as the available retransmission time domain positions of the PDCCH of the CSS. Thus, by repeatedly receiving the SS PDCCH at the determined retransmission time domain position multiple times until the maximum retransmission number is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0031] In some specific implementation manners, receiving the configuration information of the physical downlink control channel PDCCH of the target search space SS includes: receiving the configuration information of the PDCCH of the CSS through the first system information block SIB1 signaling or the radio resource control RRC signaling.

[0032] In some specific implementation manners, at an available retransmission time domain position, according to the maximum retransmission times information, the PDCCH of the SS is repeatedly received, including: determining an initial transmission PDCCH candidate set of the PDCCH of the initial transmission CSS; at the available retransmission time domain position, according to the maximum retransmission times information and the retransmission PDCCH candidate set, the PDCCH of the CSS is repeatedly received, and the retransmission PDCCH candidate set corresponds to the initial transmission PDCCH candidate set. Thereby, by repeatedly receiving the SS PDCCH multiple times at the determined retransmission time domain position until the maximum retransmission times is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0033] In some specific implementation manners, at an available retransmission time domain position, according to the maximum retransmission times information, the PDCCH of the SS is repeatedly received, including: determining an initial transmission SS of the PDCCH of the initial transmission CSS; at the retransmission time domain position, according to the maximum retransmission times information and the retransmission SS, the PDCCH of the CSS is repeatedly received, and the PDCCH candidate set of the retransmission SS is the same as the PDCCH candidate set of the initial transmission SS. Thereby, by repeatedly receiving the SS PDCCH multiple times at the determined retransmission time domain position until the maximum retransmission times is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0034] In some specific implementation manners, the configuration information further includes frequency domain resource CORESET configuration information.

[0035] In some specific implementation manners, when the target SS is a dedicated search space USS, determining the available retransmission time domain position of the PDCCH of the SS includes: according to the CORESET configuration information corresponding to the USS, determining a set of retransmission time domain positions of the PDCCH of the retransmission USS; determining the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions as the available retransmission time domain positions of the PDCCH of the USS. Thereby, by repeatedly receiving the SS PDCCH multiple times at the determined retransmission time domain position until the maximum retransmission times is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0036] In some specific implementation manners, sending the configuration information of the physical downlink control channel PDCCH of the target search space SS includes: sending the configuration information of the PDCCH of the USS through RRC signaling.

[0037] In a third aspect, the present application provides a network device, including: a memory for storing a computer program or computer instructions; a processor for executing the computer program or computer instructions stored in the memory, so that the network device executes the method as in the first aspect.

[0038] In a fourth aspect, the present application provides a terminal device, which includes: a memory for storing a computer program or computer instructions; and a processor for executing the computer program or computer instructions stored in the memory, so that the terminal device executes the method according to the second aspect.

[0039] In a fifth aspect, the present application provides a communication system, which includes a first device and a second device. The first device is used to execute the method according to the first aspect, and the second device is used to execute the method according to the second aspect.

[0040] In a sixth aspect, the present application provides a computer storage medium for storing a computer program, which is used to implement the methods according to the first aspect and the second aspect when the computer program is executed.

[0041] In a seventh aspect, the present application provides a communication device, which is applied to electronic devices such as base stations and includes: an information indication module, a position determination module, and a retransmission module. The information indication module is used to indicate the configuration information of the physical downlink control channel (PDCCH) of the target search space (SS), and the configuration information includes the maximum number of retransmissions. The position determination module is used to determine the retransmission time domain position of the SS PDCCH. The retransmission module is used to retransmit the SS PDCCH at the retransmission time domain position until the maximum number of retransmissions is reached. Thus, by retransmitting the SS PDCCH multiple times at the determined retransmission time domain position until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0042] In an eighth aspect, the present application provides a communication device, which is applied to electronic devices such as mobile phones and computers and includes: an information receiving module and a retransmission receiving module. The information receiving module is used to receive the configuration information of the physical downlink control channel (PDCCH) of the target search space (SS), and the configuration information includes the maximum number of retransmissions. The retransmission receiving module is used to re-receive the SS PDCCH at the retransmission time domain position until the maximum number of retransmissions is reached. Thus, by re-receiving the SS PDCCH multiple times at the determined retransmission time domain position until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0043] Based on the above technical solutions, the present application has the following beneficial effects:

[0044] The present application provides a communication method and related devices. After indicating the configuration information of a target search space (SS) physical downlink control channel (PDCCH) including the maximum number of retransmissions, the method determines the retransmission time domain position of the SS PDCCH, and repeatedly transmits the SS PDCCH multiple times at the retransmission time domain position until the maximum number of retransmissions is reached. Thus, by repeatedly transmitting the SS PDCCH multiple times at the determined retransmission time domain position until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, wireless communication losses can be reduced, the downlink coverage range can be improved, and communication efficiency can be enhanced. Description of the Drawings

[0045] Figure 1 FIG. is a schematic diagram of a scenario example for communication between a base station and a terminal provided by an embodiment of the present application;

[0046] Figure 2A FIG. is a flowchart of a communication method for a CSS PDCCH provided by an embodiment of the present application;

[0047] Figure 2B FIG. is a flowchart of a communication method for a USS PDCCH provided by an embodiment of the present application;

[0048] Figure 3 FIG. is a flowchart of another communication method provided by an embodiment of the present application;

[0049] Figure 4 FIG. is a schematic diagram of the hardware composition of an electronic device provided by an embodiment of the present application;

[0050] Figure 5 FIG. is a schematic diagram of the hardware composition of another electronic device provided by an embodiment of the present application;

[0051] Figure 6 FIG. is a schematic diagram of a communication device provided by an embodiment of the present application;

[0052] Figure 7 FIG. is a schematic diagram of another communication device provided by an embodiment of the present application. Detailed Embodiments

[0053] Terms such as "first", "second", and "third" in the specification, claims, and drawings of the present application are used to distinguish different objects, rather than to limit a specific order.

[0054] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0055] The embodiments of the present application are applied to a communication system. Among them, the communication system can be a second-generation (2G) communication system, a third-generation (3G) communication system, an LTE system, a fifth-generation (5G) communication system, or a hybrid architecture of Long-Term Evolution (LTE) and 5G, or a 5G New Radio (5GNR) system, as well as new communication systems emerging in the future development of communications.

[0056] The communication system includes a first device and a second device. The first device can be a device on the network side for providing network communication functions, and in some cases is also called a network device or a network element. The network device can usually be a base station (including the functional units of the base station, or a combination of the functional units of the base station) or a core network unit. Among them, the core network unit can be a functional unit in the core network, including but not limited to an Access and Mobility Management Function (AMF) unit or a Session Management Function (SMF) unit. The second device can be a device accessing the network, usually a terminal. Refer to Figure 1 , which is a scenario example diagram of communication between a base station and a terminal provided by the embodiments of the present application. Figure 1 It includes base station 1 and terminal 2.

[0057] In the embodiments provided in this application, the base station can be any device with wireless transceiver functions, including but not limited to: the evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in Long Term Evolution (LTE), the base station (gNodeB or gNB) or transmission receiving point (TRP) in New Radio (NR), the base station evolved by 3GPP subsequently, the access node in the Wi-Fi system, the wireless relay node, the wireless backhaul node, etc. The base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc. The base station can include one or more co-located or non-co-located transmission reception points (TRPs). The base station can also be a radio controller, a centralized unit (CU), and / or a distributed unit (DU) in the cloud radio access network (CRAN) scenario. The base station can communicate with the terminal or communicate with the terminal through a relay station. The terminal can communicate with multiple base stations of different technologies. For example, the terminal can communicate with a base station supporting the LTE network, can also communicate with a base station supporting the 5G network, and can also perform dual connection with a base station supporting the LTE network and a base station supporting the 5G network.

[0058] In the embodiments provided in this application, the terminal can be in various forms. For example, a mobile phone, a tablet (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a vehicle-mounted terminal device, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a wearable terminal device, and so on. Sometimes the terminal can also be referred to as a terminal device, a user equipment (UE), an access terminal device, a vehicle-mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a mobile unit, a remote station, a remote terminal device, a mobile device, a UE terminal device, a terminal device, a wireless communication device, a UE agent, or a UE device, etc. The terminal can also be a fixed terminal or a mobile terminal.

[0059] As described above, since the traditional terrestrial network cannot provide seamless coverage, especially in places where base stations cannot be deployed such as the sea, desert, air, etc., satellite communication technology has emerged as the times require.

[0060] Satellite communication technology has the following characteristics. First, the communication range of satellite communication technology is large. As long as it is within the range covered by the radio waves emitted by the satellite, communication can be carried out between any two points. For areas that cannot be covered by the current cellular communication system or where the coverage cost is relatively high, satellite communication can be used to solve the communication problem. Second, satellite communication technology is not easily affected by terrestrial disasters and has high reliability. In extreme situations such as disasters (such as earthquakes), when the infrastructure of cellular communication becomes unavailable, satellite communication can be used to quickly establish a communication connection. Third, the latency of satellite communication technology is relatively low and can provide industry applications. For example, for latency-sensitive services with long-distance transmission, the latency of service transmission can be reduced through satellite communication.

[0061] In the related art, in the project discussion of 3GPP R19 NTN (Non-Terrestrial Network) proposed by standardization organizations such as the 3rd Generation Partnership Project 3GPP, considering using satellite communication technology to achieve seamless network coverage, it is required that the base station transmit multiple downlink beams at the same time. Among them, a beam is a communication resource. The beam can be a wide beam, a narrow beam, or other types of beams, and the technology for forming the beam can be beamforming technology or other technical means.

[0062] However, since the base station cannot concentrate energy on a few beams, signal aggregation cannot be achieved, which causes huge losses in wireless communication and limits downlink coverage.

[0063] In view of this, the present application provides a communication method and related devices. After indicating the configuration information of the target search space SS Physical Downlink Control Channel PDCCH including the maximum number of retransmissions, the method determines the retransmission time domain position of the SS PDCCH, and at the retransmission time domain position, transmits the SS PDCCH repeatedly for multiple times until the maximum number of retransmissions is reached. Thus, by repeatedly transmitting the SS PDCCH multiple times at the determined retransmission time domain position until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, wireless communication losses can be reduced, the downlink coverage range can be improved, and the communication quality can be improved.

[0064] To make the technical solution of the present application clearer and easier to understand, the communication method of the present application will be introduced below with reference to the accompanying drawings.

[0065] See Figure 2A , this figure is a flowchart of a communication method for CSS PDCCH provided by an embodiment of the present application. It should be noted that the communication method provided by the embodiment of the present application is for the communication of the Common Search Space (CSS) PDCCH except for the Physical Downlink Control Channel (PDCCH) of the First System Information Block (System Information Block1, SIB1), that is, the SIB1 PDCCH, that is, the CSS PDCCH. This communication method can be executed by a network device in a communication system, such as a base station, etc. The method includes the following steps:

[0066] S201: The network device indicates the configuration information of the CSS.

[0067] The configuration information of the CSS is divided into initial transmission configuration information and additional configuration information.

[0068] The initial transmission configuration information is the configuration information specified by the R18 protocol (or the previous 3GPP NR protocol), including the time-frequency resources of the initial transmission CSS PDCCH and the set of initial transmission time-domain positions.

[0069] Specifically, the time-frequency resources are the CORESET configuration of the CSS PDCCH, which is semi-statically configured by higher-layer signaling. The CORESET includes information such as the frequency band occupied by the PDCCH in the frequency domain and the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied in the time domain. This CORESET can appear at any position in the slot in the time domain and is within the Bandwidth Part (BWP) in the frequency domain.

[0070] The set of initial transmission time-domain positions refers to the set of PDCCH Monitoring Occasions (PMOs) of the CSS PDCCH, that is, the monitoring occasions. It should be noted that the number of PMOs in the set of initial transmission PMOs is not limited in this application and can be one or more.

[0071] The additional configuration information refers to the configuration information of the CSS indicated by the SIB1 signaling or the RRC signaling.

[0072] Among them, in 5G NR, the SIB1 signaling carries information on whether the second device is allowed to access the coverage area of the first device (i.e., information on whether the user equipment is allowed to access the cell), and the basic information required when the second device accesses the coverage area of the first device, which is also the above-mentioned additional configuration information of the CSS. The RRC signaling is a radio signaling or a lower-layer signaling used to handle the signaling interaction between the first device and the second device. The 3GPP specification TS36.331 defines the RRC signaling in detail. The additional configuration information of the CSS can be carried in this RRC signaling.

[0073] Specifically, the additional configuration information of the CSS includes: the transmission period T, the period offset value offset slot and the information on the maximum number of retransmissions. Among them, the length of the transmission period T can be represented by the number of radio frames (T = 10 ms), or subframes (T = 1 ms), or slots (T = 125 ns). Exemplarily, a transmission period T can be 32 slots, that is, T = 1 us (microsecond). The period offset value offset slot requires relevant technical personnel to perform network configuration or protocol agreement. If the period offset value offset slot is not configured in the network, it is defaulted to 0.

[0074] S202: The network device determines the actual time domain position of the initial transmission of the CSS PDCCH.

[0075] If the transmission period T of the additional configuration information in step S201 is in units of time slots, then it is necessary to determine whether the starting time slot in the transmission period satisfies the following formula (1):

[0076] (2 μ ·10n f +n s ) mod T = Offset slot (1)

[0077] Where μ is the subcarrier spacing parameter, n f is the system frame number, n s is the time slot number within the radio frame, T is the transmission period, and offset slot is the cycle offset value. Specifically, μ is the subcarrier spacing parameter of the OFDM system.

[0078] If the starting time slot in the transmission period T satisfies the above formula (1), then the time window determined by the starting time slot and the duration T is determined as the transmission period of the PDCCH of the CSS. Subsequently, within the transmission period of the PDCCH of the CSS, the actual time domain position of the PDCCH of the CSS is determined, that is, the initial transmission time domain position and / or the available retransmission time domain position.

[0079] In some specific implementation manners, the method for determining the initial transmission time domain position of the PDCCH of the CSS is: within the transmission period of the PDCCH of the CSS, the first transmission opportunity is used as the initial transmission time domain position of the PDCCH of the CSS.

[0080] In some specific implementation manners, the method for determining the available retransmission time domain position of the PDCCH of the CSS is: First, determine the set of retransmission time domain positions for retransmitting the PDCCH of the CSS; Subsequently, within the transmission period of the PDCCH of the CSS, the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions are determined as the available retransmission time domain positions of the PDCCH of the CSS.

[0081] It should be noted that the above embodiments are described by taking the transmission period T in units of slots. If the transmission period T of the additional configuration information in step S201 is in units of radio frames or subframes, it is similar to the above formula and will not be elaborated here.

[0082] S203: The network device initially transmits the CSS PDCCH at the actual time domain position of the initial transmission of the CSS PDCCH.

[0083] After determining the actual time domain position of the initial transmission CSS PDCCH, the first device can initially transmit the CSS PDCCH at this actual time domain position.

[0084] S204: The network device constrains the retransmission PDCCH candidate set and the retransmission PDCCH search space.

[0085] Since the system bandwidth is large in NR, if the PDCCH occupies the entire bandwidth in the frequency domain at this time, it not only wastes resources but also greatly increases the complexity of subsequent blind detection by the second device. Among them, the process of the second device searching for the PDCCH in the time-frequency resource is called blind detection. Therefore, in order to reduce the complexity of subsequent blind detection by the second device and save blind detection resources, the first device needs to constrain the retransmission PDCCH candidate set (candidate PDCCH) and the retransmission PDCCH search space (search space, SS).

[0086] Regarding the constraint of the retransmission PDCCH candidate set, in some specific implementation manners, the retransmission PDCCH candidate set can be constrained to be the same as the initial transmission PDCCH candidate set, thereby reducing the complexity of subsequent blind detection by the second device. Exemplarily, if the initial transmission PDCCH candidate set is the first candidate set, the retransmission PDCCH candidate set can also be constrained to be the first candidate set. In some other specific implementation manners, the retransmission PDCCH candidate set can be constrained to be associated with the initial transmission PDCCH candidate set, so that the unique corresponding retransmission PDCCH candidate set can be deduced from the initial transmission PDCCH candidate set. It should be noted that this application does not limit the specific deduction rule.

[0087] Regarding the retransmission PDCCH search space, the retransmission PDCCH search space can be constrained to be the same as the initial transmission PDCCH search space, thereby reducing the complexity of subsequent blind detection by the second device. Exemplarily, if the initial transmission PDCCH search space is the first search space, the retransmission PDCCH candidate set can also be constrained to be the first search space.

[0088] It should be noted that the above S204 is an optional step of the embodiment of this application, and the communication method of the embodiment of this application may not execute the above S204 either.

[0089] S205: The network device repeatedly transmits the CSS PDCCH at the retransmission time domain position according to the constrained retransmission PDCCH candidate set and the retransmission PDCCH search space.

[0090] The retransmission time domain position refers to the time domain position in the PMO set other than the actual time domain position of the initial transmission CSS PDCCH (i.e., the initial transmission PMO). After determining the actual time domain position of the initial transmission CSS PDCCH through step S203, the PMOs other than the initial transmission PMO within each transmission period T are used as the retransmission PMO set, that is, the time domain positions after the initial transmission time domain position are determined as the retransmission time domain positions of the CSS PDCCH retransmission. Thus, the CSS PDCCH is repeatedly transmitted at the retransmission time domain positions until the maximum number of retransmissions indicated in the additional configuration information is reached.

[0091] See Figure 2B , this figure is a flowchart of a communication method for USS PDCCH provided by an embodiment of the present application. It should be noted that the communication method provided by the embodiment of the present application is for communicating with the dedicated search space (UE-specific SS, USS) corresponding to the second device UE. This communication method can be executed by a network device in a communication system, such as a base station, etc. The method includes the following steps:

[0092] S211: The network device indicates the configuration information of the USS through the RRC signaling dedicated to the second device.

[0093] If communicating with the USS PDCCH, reference should be made to the 3GPP 38.300 protocol. Only when the RRC state of the second device UE is in the RRC idle state (RRC_IDLE), after connecting the first device and the second device, the configuration information of the USS can be indicated through the RRC signaling dedicated to the second device. It can be understood that a second device has a uniquely corresponding RRC signaling.

[0094] Specifically, the additional configuration information of the CSS includes: COREST configuration, transmission period T, period offset value offset slot and the maximum number of retransmissions.

[0095] Among them, the CORESET includes information such as the frequency band occupied by the PDCCH in the frequency domain and the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied in the time domain.

[0096] The length of the transmission period T can be represented by the number of radio frames (T = 10 ms), or subframes (T = 1 ms), or time slots (slot, T = 125 ns). Exemplarily, a transmission period T can be 32 time slots, that is, T = 1 us (microsecond).

[0097] Period offset value offset slotNetwork configuration or protocol agreement is required by relevant technical personnel. If the cycle offset value offset slot is not network-configured, it is defaulted to 0.

[0098] S212: The network device determines the actual time domain position of the initial transmission USS PDCCH.

[0099] Similar to the above S202 step, if the transmission period T of the additional configuration information in the S211 step is in units of time slots, then it is necessary to determine whether the starting time slot in the transmission period satisfies the following formula (1):

[0100] (2 μ ·10n f +n s )modT = Offset slot (1)

[0101] where μ is the subcarrier spacing parameter, n f is the system frame number, n s is the time slot number within the radio frame, T is the transmission period, and offset slot is the cycle offset value.

[0102] If the starting time slot in the transmission period T satisfies the above formula (1), then the time window determined by the starting time slot and the duration T is determined as the transmission period of the PDCCH of the USS. Subsequently, within the transmission period of the PDCCH of the USS, the actual time domain position of the PDCCH of the USS is determined, that is, the initial transmission time domain position and / or the available retransmission time domain position.

[0103] In some specific implementation manners, the method for determining the initial transmission time domain position of the PDCCH of the USS is: within the transmission period of the PDCCH of the USS, the first transmission opportunity is used as the initial transmission time domain position of the PDCCH of the USS.

[0104] In some specific implementation manners, the method for determining the available retransmission time domain position of the PDCCH of the USS is: First, according to the CORESET configuration information corresponding to the USS, determine the set of retransmission time domain positions for retransmitting the PDCCH of the USS; Subsequently, among the set of retransmission time domain positions, the time domain positions after the initial transmission time domain position are determined as the available retransmission time domain positions of the PDCCH of the USS.

[0105] It should be noted that the above embodiments are described with the transmission period T in units of slots. If the transmission period T of the retransmission information in the S211 step is in units of radio frames or subframes, it is similar to the above formula and will not be elaborated here.

[0106] S213: The network device initially transmits the USS PDCCH at the time domain position of the initial transmission of the USS PDCCH.

[0107] After the first device determines the actual time domain position of the initial transmission of the USS PDCCH, it can initially transmit the USS PDCCH at this actual time domain position.

[0108] S214: The network device determines the retransmission time domain position of the retransmitted USS PDCCH.

[0109] The retransmission time domain position refers to the time domain position in the PMO set converted through the COREST configuration in step S211 except for the actual time domain position of the initial transmission of the USS PDCCH (i.e., the initial transmission PMO). After determining the actual time domain position of the initial transmission of the USS PDCCH through step S212, the PMOs other than the initial transmission PMO within each transmission period T are used as the retransmission PMO set, that is, the time domain positions after the initial transmission time domain position are determined as the retransmission time domain positions of the retransmitted USS PDCCH. Thus, the CSS PDCCH is repeatedly transmitted at the retransmission time domain position until the maximum number of retransmissions indicated in the additional configuration information is reached.

[0110] S215: The network device repeatedly transmits the USS PDCCH at the retransmission time domain position.

[0111] In summary, the present application discloses a communication method, which is applied to an electronic device and includes: indicating configuration information of a target search space SS physical downlink control channel PDCCH, where the configuration information includes the maximum number of retransmissions; determining the retransmission time domain position of the SS PDCCH; and repeatedly transmitting the SS PDCCH at the retransmission time domain position until the maximum number of retransmissions is reached. Thus, by repeatedly transmitting the SS PDCCH multiple times at the determined retransmission time domain position until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0112] See Figure 3 , which is a schematic diagram of another communication method provided by an embodiment of the present application. This communication method can be executed by a terminal device in a communication system, such as a mobile phone, a computer, etc. This method includes the following steps:

[0113] S301: The terminal device receives the configuration information of the target search space SS physical downlink control channel PDCCH, where the configuration information includes the maximum number of retransmissions.

[0114] It can be understood that the SS PDCCH here includes the CSS PDCCH and the USS PDCCH.

[0115] S302: The terminal device determines whether the signal quality of the SS PDCCH is less than or equal to the quality threshold. If so, S303 is executed. If not, S304 is executed.

[0116] It can be understood that the quality threshold is a threshold value for determining whether the signal quality meets the requirements, and it is a threshold value pre-configured by the terminal device through the protocol. The specific size of the quality threshold is not limited in this application.

[0117] In some specific implementation manners, the measurement indicators of the signal quality include the reference signal received power SS-RSRP (Synchronization Signals Reference Signal Received Power) and the reference signal received quality SS-RSRQ (Synchronization Signals Reference Signal Received Quality), etc. Among them, RSRP is used to evaluate the signal strength between the terminal device and network devices such as the base station. The higher the value, the stronger the received signal, and the unit is dBm (decibel milliwatt). RSRQ measures the quality of the received reference signal. The higher the value, the better the received signal quality, and the unit is dB (decibel).

[0118] S303: The terminal device repeatedly receives the SS PDCCH and performs combined detection.

[0119] Only when the signal quality of the SS PDCCH is less than or equal to the preset quality threshold, it is necessary to repeatedly receive the SS PDCCH multiple times. Thus, by repeatedly receiving the SS PDCCH at the determined retransmission time domain position until the maximum retransmission times are reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0120] S304: The terminal device only receives the initially transmitted SS PDCCH.

[0121] When the signal quality of the SS PDCCH is higher than the preset quality threshold, only the initially transmitted SS PDCCH can be received.

[0122] It should be noted that the above S302 and S304 are optional steps in the embodiments of this application. The communication method of the embodiments of this application may also not execute the above S302 and S304.

[0123] In summary, the present application discloses a communication method, which is applied to electronic devices such as mobile phones and computers. The method includes: receiving configuration information of the physical downlink control channel (PDCCH) of a target search space (SS), where the configuration information includes the maximum number of retransmissions; and repeatedly receiving the SS PDCCH at the retransmission time domain position until the maximum number of retransmissions is reached. Thus, by repeatedly receiving the SS PDCCH multiple times at the determined retransmission time domain position until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0124] Based on the foregoing communication method, the present application also provides an electronic device for executing the foregoing communication method. This will be described below with reference to embodiments.

[0125] See Figure 4 , which is a schematic diagram of the hardware composition of an electronic device provided by an embodiment of the present application. The electronic device may be a first device, including but not limited to a base station and a core network unit. Figure 4 Shows a simplified schematic diagram of the base station structure. The base station includes a part 410, a part 420, and a part 430. The part 410 is mainly used for baseband processing and controlling the base station, etc.; the part 410 is usually the control center of the base station and can usually be called a processor, which is used to control the base station to execute the processing operations on the first device side in the foregoing method embodiments. The part 420 is mainly used for storing computer program codes and data. The part 430 is mainly used for the transceiver of radio frequency signals and the conversion between radio frequency signals and baseband signals; the part 430 can usually be called a transceiver module, a transceiver, a transceiver circuit, or a transceiver, etc. The transceiver module of the part 430 can also be called a transceiver or a transceiver, etc., and it includes an antenna 433 and a radio frequency circuit (not shown in the figure), where the radio frequency circuit is mainly used for radio frequency processing. Optionally, the devices used to implement the receiving function in the part 430 can be regarded as a receiver, and the devices used to implement the sending function can be regarded as a transmitter, that is, the part 430 includes a receiver 432 and a transmitter 431. The receiver can also be called a receiving module, a receiver, or a receiving circuit, etc., and the transmitter can be called a transmitting module, a transmitter, or a transmitting circuit, etc.

[0126] The part 410 and the part 420 may include one or more single boards, and each single board may include one or more processors and one or more memories. The processor is used to read and execute the programs in the memory to implement the baseband processing function and the control of the base station. If there are multiple single boards, the single boards can be interconnected to enhance the processing ability. As an optional implementation manner, it may also be that multiple single boards share one or more processors, or multiple single boards share one or more memories, or multiple single boards share one or more processors at the same time.

[0127] For example, in one implementation, the transceiver module of the 430 portion is used to perform the transceiver-related processes executed by the base station (the first device) in the foregoing method embodiments. The processor of the 410 portion is used to perform the processing-related processes executed by the base station in the foregoing method embodiments.

[0128] It should be understood that Figure 4 by way of example only and not limitation, the above network device including a processor, a memory, and a transceiver may not depend on Figure 4 the structure shown.

[0129] Refer to Figure 5 , which is a schematic diagram of the hardware composition of another electronic device provided in an embodiment of the present application. The electronic device may be a second device, and the second device may be a terminal, including but not limited to electronic devices such as mobile phones and smart wearable devices (such as smart watches). Taking a mobile phone as an example, the electronic device may include a processor 510, an external memory interface 520, an internal memory 521, antenna 1, antenna 2, a mobile communication module 530, and a wireless communication module 540, etc.

[0130] It can be understood that the structure schematically shown in this embodiment does not constitute a specific limitation on the electronic device. In other embodiments, the electronic device may include more or fewer components than shown, or combine certain components, or split certain components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0131] The processor 510 may include one or more processing units. For example: the processor 510 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors.

[0132] It can be understood that the interface connection relationships between the modules schematically shown in this embodiment are only illustrative and do not constitute a structural limitation on the electronic device. In other embodiments of the present application, the electronic device may also adopt different interface connection methods or a combination of multiple interface connection methods in the above embodiments.

[0133] The external memory interface 520 can be used to connect to an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device. The external memory card communicates with the processor 510 through the external memory interface 520 to implement the data storage function. For example, files such as music and videos are saved in the external memory card.

[0134] The internal memory 521 can be used to store computer-executable program code, and the executable program code includes instructions. The processor 510 executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory 521. The internal memory 521 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.). The data storage area can store data created during the use of the electronic device (such as audio data, phone book, etc.). In addition, the internal memory 521 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc. The processor 510 executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory 521, and / or the instructions stored in the memory provided in the processor.

[0135] The wireless communication function of the electronic device can be implemented through antenna 1, antenna 2, the mobile communication module 530, the wireless communication module 540, the modulation and demodulation processor, and the baseband processor, etc.

[0136] Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in the electronic device can be used to cover a single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization rate of the antennas. For example: Antenna 1 can be multiplexed as a diversity antenna for a wireless local area network. In some other embodiments, the antenna can be used in combination with a tuning switch.

[0137] The mobile communication module 530 may provide solutions for wireless communications such as 2G / 3G / 4G / 5G applied to an electronic device. The mobile communication module 530 may include at least one filter, switch, power amplifier, low noise amplifier (LNA), etc. The mobile communication module 530 may receive electromagnetic waves through antenna 1, filter, amplify, etc. the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 530 may also amplify the signal modulated by the modulation and demodulation processor and convert it into electromagnetic waves through antenna 1 for radiation. In some embodiments, at least some functional modules of the mobile communication module 530 may be provided in the processor 510. In some embodiments, at least some functional modules of the mobile communication module 530 and at least some modules of the processor 510 may be provided in the same device.

[0138] In some embodiments, the electronic device initiates or receives a call request through the mobile communication module 530 and antenna 1.

[0139] In addition, an operating system runs on the above components. For example, iOS operating system, Android operating system, Windows operating system, etc. Application programs can be installed and run on the operating system. Those skilled in the art can clearly understand that for the sake of convenience and conciseness of description, the explanations and beneficial effects of the relevant content in any of the above-provided electronic devices can refer to the corresponding method embodiments provided above, and will not be elaborated here.

[0140] This application also provides a communication system, which may include a first device (such as a network device like a base station) as shown in Figure 4 and a second device (such as a terminal like a mobile phone) as shown in Figure 5 .

[0141] In this application, a terminal or a network device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. Among them, the hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also called main memory). The operating system of the operating system layer may be any one or more computer operating systems that implement service processing through processes. For example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system, etc. The application layer may include applications such as a browser, an address book, a word processing software, an instant messaging software, etc.

[0142] See Figure 6, this figure is a schematic diagram of a communication device provided by an embodiment of the present application. The communication device 600 is applied to electronic devices such as base stations and includes: an information indication module 601, a position determination module 602, and a retransmission module 603.

[0143] Among them, the information indication module 601 is used to indicate the configuration information of the physical downlink control channel PDCCH of the target search space SS, and the configuration information includes the maximum number of retransmissions;

[0144] The position determination module 602 is used to determine the retransmission time domain position of the SS PDCCH;

[0145] The retransmission module 603 is used to retransmit the SS PDCCH at the retransmission time domain position until the maximum number of retransmissions is reached.

[0146] In summary, the present application discloses a communication device. By repeatedly transmitting the SS PDCCH multiple times at the determined retransmission time domain position until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0147] See Figure 7 , this figure is a schematic diagram of another communication device provided by an embodiment of the present application. The communication device 700 is applied to electronic devices such as mobile phones and computers and includes: an information receiving module 701 and a retransmission receiving module 702.

[0148] Among them, the information receiving module 701 is used to receive the configuration information of the physical downlink control channel PDCCH of the target search space SS, and the configuration information includes the maximum number of retransmissions;

[0149] The retransmission receiving module 702 is used to repeatedly receive the SS PDCCH at the retransmission time domain position until the maximum number of retransmissions is reached.

[0150] In summary, the present application discloses a communication device. By repeatedly receiving the SS PDCCH multiple times at the determined retransmission time domain position until the maximum number of retransmissions is reached, the corresponding transmission performance requirements can be met, the loss of wireless communication can be reduced, the downlink coverage can be enhanced, and the communication quality can be improved.

[0151] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and apparatuses can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0152] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A communication method, characterized in that, Applied to a network device, the method includes: Indicating configuration information of a physical downlink control channel (PDCCH) of a target search space (SS), where the configuration information includes maximum retransmission times information; Determining available retransmission time domain positions of the PDCCH of the SS; At the available retransmission time domain positions, repeatedly transmitting the PDCCH of the SS according to the maximum retransmission times information.

2. The method according to claim 1, wherein The configuration information further includes initial transmission configuration information and / or transmission period information.

3. The method according to claim 2, wherein The length of the transmission period is the sum of a target number of time slots; a method for determining the transmission time domain position of the PDCCH of the SS includes: Judging whether a starting time slot in the transmission period satisfies the following formula, (2 μ × 10n f + n s ) mod T = Offset slot where μ is the subcarrier spacing parameter, n f is the system frame number, n s is the slot number within the radio frame, T is the transmission period, offset slot is the cycle offset value; If it satisfies, determining a time window determined by the starting time slot and a duration T as the transmission period of the PDCCH of the SS; Within the transmission period of the PDCCH of the SS, determining the initial transmission time domain position and / or available retransmission time domain positions of the PDCCH of the SS.

4. The method according to claim 3, characterized in that, The determining the initial transmission time domain position of the PDCCH of the SS within the transmission period of the PDCCH of the SS includes: Within the transmission period of the PDCCH of the SS, taking the first transmission occasion as the initial transmission time domain position of the PDCCH of the SS.

5. The method according to claim 4, wherein The target SS is a common search space (CSS), and the determining the available retransmission time domain positions of the PDCCH of the SS includes: Determining a set of retransmission time domain positions for retransmitting the PDCCH of the CSS; Within the transmission period of the PDCCH of the CSS, determining, as the available retransmission time domain positions of the PDCCH of the CSS, the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions.

6. The method according to claim 5, characterized in that, The indicating configuration information of the physical downlink control channel (PDCCH) of a target search space (SS) includes: Indicating the configuration information of the PDCCH of the CSS through a first system information block (SIB1) signaling or a radio resource control (RRC) signaling.

7. The method according to claim 5, wherein The repeatedly transmitting the PDCCH of the SS at the available retransmission time domain positions according to the maximum retransmission times information includes: Determining an initial transmission PDCCH candidate set for initially transmitting the PDCCH of the CSS; At the available retransmission time domain positions, repeatedly transmitting the PDCCH of the CSS according to the maximum retransmission times information and a retransmission PDCCH candidate set, where the retransmission PDCCH candidate set corresponds to the initial transmission PDCCH candidate set.

8. The method according to claim 5, characterized in that, The repeatedly transmitting the PDCCH of the SS at the available retransmission time domain positions according to the maximum retransmission times information includes: Determining an initial transmission SS for initially transmitting the PDCCH of the CSS; At the retransmission time domain positions, repeatedly transmitting the PDCCH of the CSS according to the maximum retransmission times information and a retransmission SS, where the PDCCH candidate set of the retransmission SS is the same as the PDCCH candidate set of the initial transmission SS.

9. The method according to claim 2, wherein The configuration information further includes frequency domain resource control resource set (CORESET) configuration information.

10. The method according to claim 4, wherein The target SS is a dedicated search space (USS), and the determining the available retransmission time domain positions of the PDCCH of the SS includes: Determine a set of retransmission time domain positions for retransmitting the PDCCH of the USS according to the CORESET configuration information corresponding to the USS; Determine the available retransmission time domain positions of the PDCCH of the USS as the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions.

11. The method according to claim 10, wherein The configuration information indicating the physical downlink control channel (PDCCH) of the target search space (SS) includes: Indicate the configuration information of the PDCCH of the USS through RRC signaling.

12. A communication method, characterized in that, Applied to a terminal device, the method includes: Receive the configuration information of the physical downlink control channel (PDCCH) of the target search space (SS), where the configuration information includes maximum retransmission times information; Determine the available retransmission time domain positions of the PDCCH of the SS; At the available retransmission time domain positions, repeat receiving the PDCCH of the SS according to the maximum retransmission times information.

13. The method according to claim 12, wherein The repeating to receive the PDCCH of the SS according to the maximum retransmission times information includes: If the signal quality of the PDCCH of the SS is less than or equal to a quality threshold, repeat receiving the PDCCH of the SS according to the maximum retransmission times information.

14. The method according to claim 12, wherein The configuration information further includes initial transmission configuration information and / or transmission period information.

15. The method according to claim 14, wherein The length of the transmission period is the sum of a target number of time slots; the method for determining the transmission time domain position of the PDCCH of the SS includes: Determine whether the starting time slot in the transmission period satisfies the following formula, (2 μ × 10n f + n s ) mod T = Offset slot where μ is the subcarrier spacing parameter, n f is the system frame number, n s is the time slot number within the radio frame, T is the transmission period, offset slot is the cycle offset value; If it is satisfied, determine the time window determined by the starting time slot and the duration T as the transmission period of the PDCCH of the SS; Within the transmission period of the PDCCH of the SS, determine the initial transmission time domain position and / or available retransmission time domain positions of the PDCCH of the SS.

16. The method according to claim 3, characterized in that, The determining the initial transmission time domain position of the PDCCH of the SS within the transmission period of the PDCCH of the SS includes: Within the transmission period of the PDCCH of the SS, use the first transmission occasion as the initial transmission time domain position of the PDCCH of the SS.

17. The method according to claim 16, characterized in that, When the target SS is a common search space (CSS), the determining the available retransmission time domain positions of the PDCCH of the SS includes: Determine a set of retransmission time domain positions for retransmitting the PDCCH of the CSS; Within the transmission period of the PDCCH of the CSS, determine the available retransmission time domain positions of the PDCCH of the CSS as the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions.

18. The method according to claim 17, wherein The receiving the configuration information of the physical downlink control channel (PDCCH) of the target search space (SS) includes: Receive the configuration information of the PDCCH of the CSS through the first system information block (SIB1) signaling or radio resource control (RRC) signaling.

19. The method according to claim 17, characterized in that, The repeating to receive the PDCCH of the SS at the available retransmission time domain positions according to the maximum retransmission times information includes: Determine the initial transmission PDCCH candidate set of the PDCCH of the CSS; At the available retransmission time domain positions, according to the maximum retransmission times information and the retransmission PDCCH candidate set, repeatedly receive the PDCCH of the CSS, where the retransmission PDCCH candidate set corresponds to the initial transmission PDCCH candidate set.

20. The method according to claim 17, wherein The repeatedly receiving, at the available retransmission time domain positions, the PDCCH of the SS according to the maximum retransmission times information includes: Determine the initial transmission SS of the PDCCH of the initial transmission CSS; At the retransmission time domain positions, according to the maximum retransmission times information and the retransmission SS, repeatedly receive the PDCCH of the CSS, where the PDCCH candidate set of the retransmission SS is the same as the PDCCH candidate set of the initial transmission SS.

21. The method according to claim 14, characterized in that, The configuration information further includes frequency domain resource CORESET configuration information.

22. The method according to claim 16, wherein The target SS is a dedicated search space USS. The determining of the available retransmission time domain positions of the PDCCH of the SS includes: According to the CORESET configuration information corresponding to the USS, determine the set of retransmission time domain positions for retransmitting the PDCCH of the USS; Determine the time domain positions after the initial transmission time domain position in the set of retransmission time domain positions as the available retransmission time domain positions of the PDCCH of the USS.

23. The method according to claim 22, wherein The configuration information for transmitting the physical downlink control channel PDCCH of the target search space SS includes: Transmit the configuration information of the PDCCH of the USS through RRC signaling.

24. A network device, characterized in that, The network device includes: A memory for storing computer programs or computer instructions; A processor for executing the computer programs or computer instructions stored in the memory, so that the network device executes the method according to any one of claims 1 to 11.

25. A terminal device, characterized in that, The terminal device includes: A memory for storing computer programs or computer instructions; A processor for executing the computer programs or computer instructions stored in the memory, so that the terminal device executes the method according to any one of claims 12 to 23.

26. A communication system, characterized in that, The system includes a first device and a second device. The first device is used to execute the method according to any one of claims 1 to 11, and the second device is used to execute the method according to any one of claims 12 to 23.

27. A computer storage medium for storing a computer program, which when executed is used to implement the method according to any one of claims 1 to 23.

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