Synchronization signal block SSB extension method and device, medium and program product

Abstract

The invention discloses an SSB (Synchronization Signal Block) expansion method, equipment, a medium and a program product, which are used for expanding the number of SSBs and realizing coverage of more wave positions. The method comprises the steps that when the number of wave positions needing to be served by a satellite-borne base station is larger than the number of SSB wave beams sent in each SSB period, the SSB wave beams are sent to a current cell through K SSB sets, the sum of the SSB wave beams contained in the K SSB sets is larger than the number of the wave positions, and K is a natural number larger than 1; and K SSB sets are transmitted to the current cell, and beams with the same index in different SSB sets point to different beam positions.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a synchronization signal block (SSB) expansion method, device, medium and program product. Background Art

[0002] The Synchronization Signal Block (SSB) is a broadcast beam introduced in the 5th Generation Mobile Communication Technology (5G) New Radio (NR) system. It consists of the Primary Synchronization Signal (PSS), the Secondary Synchronization Signal (SSS) and the Physical Broadcast Channel (PBCH).

[0003] In the 5G system, on the one hand, beamforming can be used to replace the original wide beam with a narrow beam, so that the radiation energy in the horizontal and vertical dimensions can be accurately aimed at the target user to enhance the coverage capability of the common channel / control channel; on the other hand, beam scanning technology can be used to scan and send different SSB beams at a fixed period to achieve coverage of the entire cell and improve the area coverage rate.

[0004] In the 3rd Generation Partnership Project (3GPP) non-terrestrial network (NTN), in transparent forwarding mode, only localized beam coverage is considered, and the existing SSB beam design of 5G NR can still be used. In the time domain, the time slots available for transmitting synchronization signal blocks within a system half-frame are limited. Depending on the subcarrier spacing and frequency settings, the maximum number of SSBs that can be transmitted within a half-frame, or within an SSB period, is 4, 8, or 64.

[0005] At present, the main development direction of low-orbit satellite communication systems is to provide global broadband access services for ground or low-altitude users. However, low-orbit satellites are small in size, platform resources are limited (such as power limitation, limited number of concurrent beams, etc.), and ground services are unevenly distributed, which brings many challenges to the design of satellite-to-ground access solutions that require full-area coverage. The maximum number of SSBs in the SSB concentration in existing technical solutions is 4 / 8 / 64, which makes it difficult to meet the thousands of wave positions required for full-area coverage. Summary of the Invention

[0006] The present invention provides a synchronization signal block (SSB) expansion method, device, medium and program product for expanding the number of SSBs and achieving coverage of more wave positions.

[0007] In a first aspect, an embodiment of the present invention provides a synchronization signal block (SSB) extension method, which is applied to a satellite base station. The method includes:

[0008] When the number of beam positions that the satellite-borne base station needs to serve is greater than the number of SSB beams sent in each SSB period, an SSB beam is sent to the current cell using K SSB sets, where the sum of the SSB beams included in the K SSB sets is greater than the number of beam positions, and K is a natural number greater than 1;

[0009] K SSB sets are transmitted to the current cell, where beams with the same index in different SSB sets point to different beam positions.

[0010] As an optional implementation manner, each of the K SSB sets contains the same number of SSB beams.

[0011] As an optional implementation, the method further includes:

[0012] The K is sent to the terminal device as the scanning period extension coefficient.

[0013] As an optional implementation manner, sending K as a scanning period extension coefficient to the terminal device includes:

[0014] The K is sent to the terminal device as the scanning period extension coefficient through the system message SIB1 or the radio resource control RRC reconfiguration message.

[0015] As an optional implementation, the method further includes:

[0016] When the multiplexing pattern between the SSB and the control resource set CORESET0 is configured as multiplexing pattern 1, the SSB scanning period is configured to be greater than or equal to 20 milliseconds.

[0017] As an optional implementation, the method further includes:

[0018] The configured SSB scanning period is sent to the terminal device through the SIB1 message or RRC reconfiguration message.

[0019] As an optional implementation, the method further includes:

[0020] In the paging configuration parameters, K paging frames are used as a paging frame group, each paging frame corresponds to at least one paging opportunity, the number of monitoring opportunities MO configured in each paging opportunity is the same as the number of SSB beams contained in a single SSB set, and the monitoring opportunities MO correspond one-to-one to the SSB beams.

[0021] As an optional implementation, the method further includes:

[0022] In the paging configuration parameters, each wake-up cycle configures N update paging frames, each paging frame corresponds to a paging opportunity, each paging opportunity PO includes K search spaces, the number of monitoring opportunities MO configured in each search space is the same as the number of SSB beams contained in a single SSB set, and the x*S+Mth physical downlink control channel PDCCH MO for paging located in the kth search space in PO corresponds to the Mth transmitted SSB;

[0023] in, N is the total number of paging frames in a pre-configured wake-up cycle, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, X is the number of MOs mapped to an SSB, the value range of x is a natural number between [0, X-1], S is the number of SSB beams contained in an SSB set, and the value range of M is a natural number between [1, S].

[0024] As an optional implementation, the method further includes:

[0025] The paging configuration parameters are sent to the terminal device via a SIB1 message or an RRC reconfiguration message.

[0026] In a second aspect, an embodiment of the present invention provides a synchronization signal block (SSB) extension method, which is applied to a terminal device, and the method includes:

[0027] After establishing a connection with the satellite-borne base station, receiving a scanning cycle extension coefficient K sent by the satellite-borne base station;

[0028] Determining a new SSB scanning period based on the current SSB scanning period and the scanning period extension coefficient K;

[0029] The SSB beam is scanned and searched using the new SSB scanning period.

[0030] As an optional implementation manner, the receiving the scanning period extension coefficient K sent by the satellite base station includes:

[0031] Receive the scanning period extension coefficient K sent by the satellite-borne base station through a SIB1 message or an RRC reconfiguration message.

[0032] As an optional implementation, the method further includes:

[0033] Before establishing a connection with the satellite-borne base station, determining a target SSB scanning period based on a pre-configured target scanning period extension factor and an initial SSB scanning period;

[0034] The search SSB beam is scanned using the target SSB scanning period to determine an initial SSB.

[0035] As an optional implementation manner, the target scanning period extension coefficient is a maximum value of at least one pre-configured scanning period extension coefficient.

[0036] As an optional implementation, the current SSB scanning period is determined based on the SIB1 message or RRC reconfiguration message sent by the satellite base station.

[0037] As an optional implementation, the method further includes:

[0038] Receive paging configuration parameters sent by the satellite base station through a SIB1 message or an RRC reconfiguration message.

[0039] As an optional implementation, the method further includes:

[0040] Based on the paging configuration parameters, formula 1 is used to determine the starting radio frame SFN of the paging frame group in which the terminal device is located, the paging frame of the terminal device corresponds to the kth paging frame in the paging frame group, the position of the kth paging frame is determined by formula 2, and the monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the paging opportunity corresponding to the kth paging frame;

[0041] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )Formula 1

[0042]

[0043] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0044] As an optional implementation, the method further includes:

[0045] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame where the terminal device is located is determined using Formula 3, and the monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space:

[0046] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )Formula 3

[0047] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0048] In a third aspect, an embodiment of the present invention further provides a synchronization signal block (SSB) expansion device, including:

[0049] a configuration unit, configured to send an SSB beam to the current cell using K SSB sets when the number of beams to be served by the satellite-borne base station is greater than the number of SSB beams sent in each SSB period, where the sum of the SSB beams included in the K SSB sets is greater than the number of beams, and K is a natural number greater than 1;

[0050] The sending unit is used to transmit K SSB sets to the current cell, where beams with the same index in different SSB sets point to different beam positions.

[0051] As an optional implementation manner, each of the K SSB sets contains the same number of SSB beams.

[0052] As an optional implementation manner, the sending unit is further configured to:

[0053] The K is sent to the terminal device as the scanning period extension coefficient.

[0054] As an optional implementation manner, the sending unit is specifically configured to:

[0055] The K is sent to the terminal device as the scanning period extension coefficient through the system message SIB1 or the radio resource control RRC reconfiguration message.

[0056] As an optional implementation manner, the configuration unit is further configured to:

[0057] When the multiplexing pattern between the SSB and the control resource set CORESET0 is configured as multiplexing pattern 1, the SSB scanning period is configured to be greater than or equal to 20 milliseconds.

[0058] As an optional implementation manner, the sending unit is further configured to:

[0059] The configured SSB scanning period is sent to the terminal device through the SIB1 message or RRC reconfiguration message.

[0060] As an optional implementation manner, the configuration unit is further configured to:

[0061] In the paging configuration parameters, K paging frames are used as a paging frame group, each paging frame corresponds to at least one paging opportunity, the number of monitoring opportunities MO configured in each paging opportunity is the same as the number of SSB beams contained in a single SSB set, and the monitoring opportunities MO correspond one-to-one to the SSB beams.

[0062] As an optional implementation manner, the configuration unit is further configured to:

[0063] In the paging configuration parameters, each wake-up cycle configures N update paging frames, each paging frame corresponds to a paging opportunity, each paging opportunity PO includes K search spaces, the number of monitoring opportunities MO configured in each search space is the same as the number of SSB beams contained in a single SSB set, and the x*S+Mth physical downlink control channel PDCCH MO for paging located in the kth search space in PO corresponds to the Mth transmitted SSB;

[0064] in, N is the total number of paging frames in a pre-configured wake-up cycle, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, X is the number of MOs mapped to an SSB, the value range of x is a natural number between [0, X-1], S is the number of SSB beams contained in an SSB set, and the value range of M is a natural number between [1, S].

[0065] As an optional implementation manner, the sending unit is further configured to:

[0066] The paging configuration parameters are sent to the terminal device via a SIB1 message or an RRC reconfiguration message.

[0067] In a fourth aspect, an embodiment of the present invention provides a synchronization signal block (SSB) expansion device, applied to a terminal device, the device comprising:

[0068] A receiving unit, configured to receive a scanning cycle extension coefficient K sent by the satellite base station after establishing a connection with the satellite base station;

[0069] a processing unit, configured to determine a new SSB scanning period based on a current SSB scanning period and the scanning period extension coefficient K;

[0070] The search unit is configured to use the new SSB scanning period to scan and search the SSB beam.

[0071] As an optional implementation manner, the receiving unit is specifically configured to:

[0072] Receive the scanning period extension coefficient K sent by the satellite-borne base station through a SIB1 message or an RRC reconfiguration message.

[0073] As an optional implementation manner, the processing unit is further configured to:

[0074] Before establishing a connection with the satellite-borne base station, determining a target SSB scanning period based on a pre-configured target scanning period extension factor and an initial SSB scanning period;

[0075] The search unit is further configured to: use the target SSB scanning period to scan and search the SSB beam to determine an initial SSB.

[0076] As an optional implementation manner, the target scanning period extension coefficient is a maximum value of at least one pre-configured scanning period extension coefficient.

[0077] As an optional implementation, the current SSB scanning period is determined based on the SIB1 message or RRC reconfiguration message sent by the satellite base station.

[0078] As an optional implementation manner, the receiving unit is further configured to:

[0079] Receive paging configuration parameters sent by the satellite base station through a SIB1 message or an RRC reconfiguration message.

[0080] As an optional implementation manner, the processing unit is further configured to:

[0081] Based on the paging configuration parameters, formula 1 is used to determine the starting radio frame SFN of the paging frame group in which the terminal device is located, the paging frame of the terminal device corresponds to the kth paging frame in the paging frame group, the position of the kth paging frame is determined by formula 2, and the monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the paging opportunity corresponding to the kth paging frame;

[0082] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod Nupdate )Formula 1

[0083]

[0084] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0085] As an optional implementation manner, the processing unit is further configured to:

[0086] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame where the terminal device is located is determined using Formula 3, and the monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space:

[0087] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )Formula 3

[0088] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0089] In the fifth aspect, an embodiment of the present invention provides a synchronization signal block (SSB) expansion device, which includes a processor and a memory, wherein the memory is used to store programs executable by the processor, and the processor is used to read the programs in the memory and execute any one of the methods in the first aspect or the second aspect.

[0090] In a sixth aspect, an embodiment of the present invention further provides a computer storage medium on which a computer program is stored, which, when executed by a processor, is used to implement the steps of the method described in the first or second aspect above.

[0091] In a seventh aspect, the present application provides a computer program product, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method described in any one of the first aspect or the second aspect.

[0092] Beneficial effects of the embodiments of the present invention:

[0093] The embodiments of the present invention provide a synchronization signal block (SSB) expansion method, device, medium and program product. As far as the satellite base station side is concerned, when the number of wave positions that the satellite base station needs to serve is greater than the number of SSB beams sent in each SSB period, K SSB sets are used to send SSB beams to the current cell. The sum of the SSB beams contained in the K SSB sets is greater than the number of wave positions, and it is ensured that beams with the same index in different SSB sets point to different wave positions. In this way, the number of SSBs is equivalently expanded by crossing the SSB period, and more wave position coverage can be achieved without changing the SSB time domain resources and the maximum number of SSBs sent in the half-frame window defined in the current 3GPP 5G NR protocol.

[0094] These and other aspects of the present application will be more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0096] Figure 1 A schematic diagram illustrating the principle of a synchronization signal block (SSB) expansion method provided in an embodiment of the present invention;

[0097] Figure 2 A schematic flow chart of a synchronization signal block (SSB) expansion method provided in an embodiment of the present invention;

[0098] Figure 3 A schematic diagram illustrating the principle of a method for determining a monitoring time slot provided by an embodiment of the present invention;

[0099] Figure 4 A schematic diagram of the principle of configuring the time domain position of the PDCCH MO corresponding to the terminal device provided in an embodiment of the present invention;

[0100] Figure 5 A schematic diagram of another principle for configuring the time domain position of the PDCCH MO corresponding to the terminal device provided in an embodiment of the present invention;

[0101] Figure 6 A schematic flow chart of another synchronization signal block (SSB) expansion method provided by an embodiment of the present invention;

[0102] Figure 7 A schematic diagram of a synchronization signal block (SSB) expansion device provided in an embodiment of the present invention;

[0103] Figure 8 A schematic diagram of another synchronization signal block (SSB) expansion device provided by an embodiment of the present invention;

[0104] Figure 9 A schematic diagram of a synchronization signal block (SSB) expansion device provided in an embodiment of the present invention;

[0105] Figure 10 Schematic diagram of another synchronization signal block SSB expansion device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0106] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0107] In embodiments of the present invention, the term "and / or" describes the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0108] The application scenarios described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. Persons skilled in the art will appreciate that as new application scenarios emerge, the technical solutions provided by the embodiments of the present invention will also be applicable to similar technical problems. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0109] Before introducing the synchronization signal block SSB extension method provided in the embodiment of the present application, in order to facilitate understanding, the technical background of the embodiment of the present application is first introduced in detail below.

[0110] SSB is a broadcast beam introduced in the fifth-generation mobile communication technology 5G NR system, which consists of PSS, SSS and PBCH.

[0111] In the 5G system, on the one hand, beamforming can be used to replace the original wide beam with a narrow beam, so that the radiation energy in the horizontal and vertical dimensions can be accurately aimed at the target user to enhance the coverage capability of the common channel / control channel; on the other hand, beam scanning technology can be used to scan and send different SSB beams at a fixed period to achieve coverage of the entire cell and improve the area coverage rate.

[0112] In 3GPP NTN, in transparent forwarding mode, only local beam coverage needs to be considered, and the existing SSB beam design scheme of 5G NR can still be used. In the time domain, the time slots available for transmitting synchronization signal blocks within a system half-frame are limited. Depending on the subcarrier spacing and frequency settings, the maximum number of SSBs transmitted within a half-frame or an SSB cycle is 4, 8, or 64. Specifically, in NR, the time domain mode of SSB transmission varies. The transmission of SSBs within an SSB cycle is limited to a half-frame window of 5 milliseconds (ms). For frequency ranges below 3 GHz, the maximum number of SSBs in an SSB set is 4; for frequencies between 3 GHz and 6 GHz, the maximum number of SSBs in an SSB set is 8; and for frequencies between 6 GHz and 52.6 GHz, the maximum number of SSBs in an SSB set is 64, in order to achieve a trade-off between coverage and resource overhead. It can be seen that the maximum number of SSBs in the SSB set in the existing technical solution is 4, 8, or 64, that is, the maximum number of SSBs in one cycle can only be covered by scanning 4, 8, or 64 wave positions.

[0113] Currently, the primary development direction of low-orbit satellite communication systems is to provide global broadband access services to users on the ground or at low altitudes. However, the small size of low-orbit satellites, limited platform resources (such as power and the number of concurrent beams), and uneven distribution of ground services pose numerous challenges to the design of satellite-to-ground access solutions that require full coverage. Existing solutions have a maximum SSB count of 4, 8, or 64, making it difficult to meet the thousands of beam positions required for full coverage.

[0114] In view of this, the embodiments of the present invention provide a synchronization signal block SSB expansion method, device, medium and program product. As far as the satellite base station side is concerned, when the number of wave positions that the satellite base station needs to serve is greater than the number of SSB beams sent in each SSB period, K SSB sets are used to send SSB beams to the current cell. The sum of the SSB beams contained in the K SSB sets is greater than the number of wave positions, and it is ensured that beams with the same index in different SSB sets point to different wave positions. In this way, the number of SSBs is equivalently expanded across SSB periods, and more wave position coverage can be achieved without changing the SSB time domain resources and the maximum number of SSBs sent in the half-frame window defined in the current 3GPP 5G NR protocol.

[0115] After introducing the technical background of the embodiment of the present application, Figure 1 The inventive concept of the SSB extension solution provided by the embodiment of the present invention is first described in detail.

[0116] The SSB extension method provided in an embodiment of the present invention equivalently extends or increases the number of SSBs by extending the SSB scanning period of the terminal device. That is, from the perspective of the terminal device, the SSB scanning period is extended to an integer multiple of the original SSB scanning period. From the perspective of the satellite base station, the SSB set does not change, but beams with the same index in different SSB sets point to different ground wave positions until all wave positions in the entire cell are covered.

[0117] like Figure 1 As shown in the figure, the gNodeB (gNB) needs to cover 64 wavelengths in the current cell, meaning that the current cell has 64 wavelengths within its coverage area. For example, with a subcarrier spacing of 30 kHz and a frequency range of 3 GHz to 6 GHz, using SSB time domain mode case C, each SSB cycle contains eight SSBs, corresponding to SSB indices 0 to 7, distributed in the first half of each SSB cycle.

[0118] This embodiment of the present invention extends the SSB scanning period of a terminal device to eight existing SSB periods. The eight beams corresponding to each SSB period serve eight different wave positions. Through the 64 SSBs in eight periods, time and space divisions are used to cover the 64 wave positions and deliver synchronization signal blocks. For a terminal device in a particular wave position, it can uniquely specify the corresponding SSB beam by indexing the kth period and the lth (lowercase L) beam within the period.

[0119] After introducing the inventive concept of the embodiment of the present application, the SSB extension method provided by the embodiment of the present invention is described in detail below in conjunction with specific embodiments.

[0120] like Figure 2 As shown, the synchronization signal block SSB expansion method provided in this embodiment, when applied to a satellite base station, its implementation process is as follows:

[0121] Step 201: When the number of wave positions that the satellite-borne base station needs to serve is greater than the number of SSB beams sent in each SSB period, K SSB sets are used to send SSB beams to the current cell. The sum of the SSB beams contained in the K SSB sets is greater than the number of wave positions, and K is a natural number greater than 1.

[0122] It should be noted that the number of wave positions that the satellite base station needs to serve is usually less than or equal to the total number of wave positions covered by the satellite base station. For example, in actual applications, according to the configuration of the satellite base station, if the satellite base station only needs to scan the wave positions in part of the coverage area, then the wave positions in this part of the area are the wave positions that the satellite base station needs to serve.

[0123] During specific implementation, the number of wavelengths that the satellite-borne base station needs to serve can be obtained from the configuration parameters of the base station or the cell, or can be determined using methods in the prior art, which is not limited in the embodiments of the present invention.

[0124] In specific implementation, when the number of wave positions that the satellite base station needs to serve is greater than the number of SSB beams sent in each SSB period, K SSB sets are configured, and the sum of the SSB beams contained in the K SSB sets is greater than the number of wave positions that the satellite base station needs to serve. Of course, if the number of wave positions that the satellite base station needs to serve is less than or equal to the number of SSB beams sent in each half-frame window in the current SSB transmission time domain mode, only one SSB set is configured, that is, K is equal to 1. Among them, the SSB set refers to the collection of SSB beams sent in each SSB period.

[0125] It should be noted that the number of SSB beams contained in each of the K SSB sets may be the same. For example, when the number of wave positions that the satellite base station needs to serve is 90 and the maximum number of SSB beams sent in each SSB period is 64, two SSB sets may be configured, each containing 45 SSB beams. In other embodiments of the present invention, the number of SSB beams contained in each of the K SSB sets may be the same or different. Still assuming that the number of wave positions that the satellite base station needs to serve is 90 and the maximum number of SSB beams sent in each SSB period is 64, two SSB sets may be configured, one containing 50 SSB beams and the other containing 40 SSB beams.

[0126] The following describes a method for determining K by taking an example where each of K SSB sets contains the same number of SSB beams.

[0127] Assume that in a cell, the number of wavelengths that the satellite base station needs to serve is N b , when a specific frequency band and subcarrier are determined (that is, when the time domain mode CaseX of SSB transmission is clear), the maximum number of SSBs that can be sent in each SSB cycle (or each half-frame window) is L max , and N b >L max In order to cover the wavelengths to be served, K SSB sets need to be configured, where K can be calculated using the following formula (1):

[0128]

[0129] In the equivalent expansion period, for the Frequency Division Duplexing (FDD) system, K*L max Valid SSB beam.

[0130] In actual applications, considering resource overhead, there may not be enough resources to complete L in half a frame period. max At the same time, for the Time Division Duplexing (TDD) system, due to the large transmission delay in the satellite communication system, the Guard Period (GP) time slot is relatively long, and there is generally not enough downlink time domain resource to complete L in each SSB cycle. max Scanning of the beam.

[0131] Therefore, the embodiment of the present application defines L as the number of beams actually sent in each SSB period after comprehensively considering the balance between coverage range and resource overhead. For FDD and TDD standards, the same SSB extension method is adopted. It should be noted that within the same SSB period, the number of beams that can actually be sent under the FDD standard and the TDD standard is different (because the TDD downlink time slot resources are less than the FDD system). Therefore, when covering the same number of wave positions, more SSB periods need to be extended under the TDD standard.

[0132] Based on the revised number of beams actually transmitted in each SSB period, if the beam positions to be served are to be covered, K is revised to the following formula (2):

[0133]

[0134] It should be noted that, in other embodiments of the present invention, considering that the actual number of SSB beams L sent in each SSB period in actual applications is less than L max , therefore, in N b >L, that is, when the number of wave positions that the satellite base station needs to serve is greater than the number of SSB beams that can actually be sent in each SSB cycle, it is necessary to configure K SSB sets, and ensure that the sum of the SSB beams contained in the K SSB sets is greater than the number of wave positions that the satellite base station needs to serve.

[0135] K can also be called the SSB scanning cycle expansion coefficient of the terminal device. In other words, the SSB scanning cycle of the terminal device needs to be extended to K times the original SSB scanning cycle. In the extended scanning cycle of the entire terminal device, there are K*L max There are effective SSB beam transmission moments, but K*L beams are actually transmitted.

[0136] In specific implementation, the existing information element ssb-PositionsInBurst in the 3GPP 5G NR protocol can be used to indicate which time domain position beam the satellite base station sent within K SSB periods. Without expanding the ssb-PositionsInBurst bit, the K SSB periods use the same bit map, where the L bit is set to 1, indicating the transmission of the corresponding L SSBs.

[0137] Step 202: K SSB sets are transmitted to the current cell, where beams with the same index in different SSB sets point to different beam positions.

[0138] In specific implementation, when transmitting K SSB sets to the current cell, the embodiment of the present invention does not change the configuration related to the SSB period, such as the SSB period length, the time-frequency domain position of the SSB, etc. The beam corresponding to each SSB of the satellite base station in the extended period covers wave positions at different positions, that is, in different SSB periods, beams with the same index point to wave positions at different positions.

[0139] During specific implementation, the satellite-borne base station may also send K as a scanning period extension coefficient to the terminal device to instruct the terminal device to extend its SSB scanning period by K times.

[0140] In specific implementation, when K is sent to the terminal device as the scanning period extension coefficient, K can be sent to the terminal device as the scanning period extension coefficient through a system message (SystemInformationBlockType1, SIB1) or a radio resource control (Radio Resource Control, RRC) reconfiguration message.

[0141] Among them, for the terminal device, the determination of its SSB scanning period can be divided into the following two cases:

[0142] Before the terminal device establishes a connection with the satellite base station, that is, before the terminal device receives the SIB1 message, the SSB scanning period of the terminal device is a pre-configured initial SSB scanning period, for example, the initial SSB scanning period is 20ms.

[0143] After the terminal device establishes a connection with the satellite base station, the SSB scanning period of the terminal device is determined according to the SIB1 message or RRC reconfiguration message sent by the satellite base station.

[0144] In this way, the terminal device located at a certain wave position in the current cell needs to scan for initial beam selection within the extended SSB period, and select the strongest SSB beam pointing to the current wave position through relevant strategies (such as based on the reference signal receiving power (RSRP)).

[0145] Similarly, adaptive design is required for paging opportunities and random access opportunities related to SSB configuration. For example, if the strongest beam is located in the kth SSB cycle, then SSB-related operations such as random access opportunities and paging opportunities will all use the relevant opportunities corresponding to the kth cycle.

[0146] Specifically: In the existing 3GPP 5G protocol, detailed information about the SSB (such as the period, actual SSB bitmap, etc.) is notified to the terminal device through the SIB1 message or the RRC reconfiguration message. This message includes at least the following two information elements:

[0147] ssb-PositionsInBurst: Indicates the time domain position of the transmitted SSB within the SSB period (the SSB concentration within the half-frame window). The first or leftmost bit corresponds to SSB index 0, the second bit corresponds to SSB index 1, and so on. A value of 0 in the bitmap indicates that the corresponding SSB is not transmitted; a value of 1 indicates that the corresponding SSB is transmitted.

[0148] ssb-periodicityServingCell: The SSB period (in milliseconds) used for rate matching purposes, i.e., the half-frame period during which the SSB set is transmitted. The existing 3GPP NR defines the possible SSB period values ​​as 5ms, 10ms, 20ms, 40ms, 80ms, or 160ms. Regardless of the length of the SSB period, the SSB set within each SSB period is concentrated within a 5ms window. If this field is not present, the terminal device defaults to a 5ms SSB period.

[0149] The above two information elements are defined in ServingCellConfigCommon and ServingCellConfigCommonSIB. The actual SSB scanning period extension coefficient K of the terminal device can also be defined in a similar way, such as defining the information element "ssb-PeriodCoeff" indication in ServingCellConfigCommon and ServingCellConfigCommonSIB and sending it to the terminal device. The specific explanation is as follows:

[0150] ssb-PeriodCoeff: The actual SSB scanning period extension coefficient of the UE, that is, the parameter K mentioned in the embodiment of the present invention. If in milliseconds (ms), the SSB scanning period of the terminal device is extended to m = ssb-PeriodCoeff * ssb-periodicityServingCell milliseconds. It indicates how many SSB periods the SSB scanning period of the terminal device can span. Within a period of m milliseconds, there is only one SSB beam pointing to the wave position where the terminal device is located. It is assumed that it corresponds to the lth SSB beam in the kth SSB period, where k∈[1,…,K],l∈[1,…,L max ], then (k, l) can uniquely represent an SSB in the entire SSB extension period.

[0151] During the initial downlink synchronization process, before the terminal device receives the SIB1 message, the default SSB period is 20ms, and the default SSB extension period is the maximum value defined by the information element "ssb-PeriodCoeff", for example, it can be defined as an integer value such as 8, 16, or 32.

[0152] In practical applications, a larger SSB extension period coefficient, K, increases the actual SSB scanning period of a terminal device, and this increases the average access delay, handover delay, and paging delay. The greater the number of wave bits a single cell can cover, the larger the coverage area. Therefore, the specific K value should be selected based on a comprehensive balance between area coverage and access delay during network deployment.

[0153] It should be noted that the above method of notifying the terminal device of the SSB period extension coefficient through the cell definition, the definition of the cell ssb-PeriodCoeff is a cell-level definition, which is consistent for all terminal devices in the cell, and the above method is only an example definition scheme. The present invention does not limit the specific definition method of the specific SSB period extension coefficient in the protocol. For example, the SSB period extension coefficient can also be implicitly sent down by reusing the high-order bits in the frame number.

[0154] The terminal device can directly calculate the position of its current SSB period within the SSB extension period, i.e., index k, using the information element ssb-PeriodCoeff, the index of the strongest received SSB beam, and the system frame number. In subsequent access and paging schemes, the terminal device only needs to focus on access opportunities and paging opportunities within its own SSB period or those related to the SSB within its SSB period (i.e., (k, l)).

[0155] The following describes, in conjunction with specific embodiments, the impact of the synchronization signal block SSB extension scheme provided in the embodiments of the present invention on various processes in existing communication systems that require the use of SSB or are related to sending SSB.

[0156] 1. Impact on Downlink Time-Frequency Synchronization

[0157] In existing systems, during the initial downlink time-frequency synchronization process, the default SSB period of the terminal device is 20ms. The impact of extending the SSB scanning period on the system can be considered from two aspects (taking a 20ms SSB period as an example):

[0158] From the perspective of the satellite base station, the SSB period is still 20ms, but in different SSB periods, the base station scans different wave positions until K SSB periods are completed, and then starts from the first wave position.

[0159] From the perspective of the terminal device, the SSB scanning period is extended K times. That is, within K SSB periods, only one beam will scan the terminal device's position. From the perspective of the terminal device's initial cell search development and implementation, the terminal device can still use the processing capabilities of the existing default SSB period of 20ms, but needs to process K periods. Therefore, the terminal device's access latency increases due to the extended SSB scanning period.

[0160] 2. Impact on SIB1 Time Domain Configuration

[0161] Chapter 13 of protocol 38.213 defines the mapping tables between Type 0-PDCCH monitoring timing and searchSpaceZero information, namely Table 13-11 to Table 13-15A.

[0162] When the multiplexing pattern between SSB and CORESET0 adopts multiplexing pattern 1, the terminal device monitors Type0-PDCCH in two consecutive time slots. The two consecutive time slots serve as a monitoring window containing Type0-PDCCH monitoring opportunities. The starting time slot is numbered n0. The period of the monitoring window is 20ms. In each period, each SSB with index i corresponds to a Type0-PDCCH monitoring window. The number n0 of the starting time slot of the monitoring window is determined by the following formula (3):

[0163]

[0164] in, is the number of time slots in a radio frame. M and O are obtained based on the searchSpaceZero information and the mapping table between the PDCCH monitoring opportunity and the searchSpaceZero information in Chapter 13 of protocol 38.213. The lower 4 bits of the pdcch-ConfigSIB1 information field carried by the PBCH are used to indicate the searchSpaceZero information. These 4 bits indicate an index in Table 13-11 to Table 13-12. After determining the time slot number n0, the radio frame number SFN where the monitoring window is located must also be determined. C .

[0165] For radio frame number SFN C , as defined in Agreement 38.213:

[0166] when SFN c mod2=0;

[0167] when SFN c mod2=1.

[0168] That is, according to When the calculated number of time slots is less than the number of time slots contained in a wireless frame, SFN c is an even-numbered wireless frame; otherwise, SFN c Odd-numbered radio frames.

[0169] When the multiplexing pattern between SSB and CORESET0 adopts multiplexing pattern 2 and 3, the terminal device monitors Type0-PDCCH in one time slot, and the period of the monitoring time slot is equal to the SSB period. In each monitoring period, the SSB with index i corresponds to the number n of the monitoring time slot. c and the wireless frame number SFN c , which is related to the wireless frame and time slot where the SSB is located, and has a one-to-one correspondence. It can be determined by mapping Tables 13-13 to 13-15 of the monitoring timing and searchSpaceZero information.

[0170] Taking Table 13-11 corresponding to FR1 as an example, as shown in Table 1 below, if the index is 4, the SSB index is 3, and the subcarrier spacing is 30KHz, it can be determined by looking up the table that O=5 and M=1. According to the formula, n0=13, SFN c For an even frame, the monitoring time slots are 13 and 14. Figure 3 shown.

[0171] Table 1

[0172] index O Number of search spaces per time slot M First index number 4 5 1 1 0

[0173] After the SSB scanning period is extended, the impact on the SIB1 monitoring time slot is as follows:

[0174] When the multiplexing pattern between SSB and CORESET0 is multiplexing pattern 1, the period of SIB1 is 20ms. If the period of SSB is greater than or equal to 20ms, the SIB1 monitoring opportunities within the SSB period are sufficient (on average, one SSB can be considered to correspond to multiple monitoring opportunities).

[0175] From the perspective of the satellite base station, the wave position pointed to by SIB1 in each SSB cycle when it is sent is consistent with the corresponding SSB beam in this cycle. That is, in K different SSB cycles, the information sent by SIB1 remains unchanged, but the beam pointing is different. If the SSB cycle is less than 20ms, the monitoring timing of SIB1 within 20ms cannot correspond one-to-one to the SSB beam. For example, when the SSB cycle is 5ms, 4 identical SSB indexes within 20ms correspond to 2 monitoring time slots. If 4 SSB beams with the same index point to different wave positions, the four different wave positions cannot obtain equal-opportunity monitoring time slots. Therefore, when the scanning period of the SSB is extended, the configuration of the SSB period needs to be greater than or equal to 20ms. Time slot number n0 and wireless frame number SFN C No adjustments are required for the calculations.

[0176] From the perspective of the terminal device, within every K SSB cycles, the terminal device only needs to monitor the SIB1 monitoring opportunity corresponding to the lth SSB beam in the kth SSB cycle (the SSB beam corresponding to the wave position where the terminal device is located).

[0177] When the multiplexing pattern between SSB and CORESET0 is multiplexing pattern 2 or multiplexing pattern 3, the period of CORESET0's monitoring time slot is equal to the SSB period and corresponds one to one. Therefore, from the perspective of the base station, the wave position pointed to by the SIB1 in each SSB period when it is sent is consistent with the corresponding SSB beam in this period. From the perspective of the terminal device, within every K SSB periods, the terminal device only needs to monitor the SIB1 monitoring opportunity corresponding to the lth SSB beam in the kth SSB period (the SSB beam corresponding to the wave position where the terminal device is located), which is the same as the case when multiplexing pattern 1 is used.

[0178] In summary, after extending the SSB scanning period (i.e., K>1), there is no impact on the timing of SIB1. It is only necessary to clarify that when the multiplexing pattern between SSB and the control resource set CORESET0 is configured as multiplexing pattern 1, the SSB scanning period of the terminal device is configured to be greater than or equal to 20 milliseconds through the SIB1 message.

[0179] 3. Impact on Random Access Timing

[0180] In NR, only when the beam scanning signal of the SSB covers the wave position where the terminal device is located, the terminal device has the opportunity to send PRACH random access, that is, the PRACH transmission time or access opportunity (PRACH occasion, RO) needs to establish a mapping relationship with the SSB index.

[0181] In order to ensure that each actually transmitted SSB is mapped to at least one RO, in addition to the PRACH configuration period (i.e., x in Tables 6.3.3.2-2 to 6.3.3.2-4 of protocol 38.211), the concept of association period is also defined. An association period is a multiple of the PRACH configuration period. The specific definition and possible values ​​are shown in Table 2.

[0182] Table 2

[0183] PRACH configuration period Correlation cycle 10 {1，2，4，8，16} 20 {1，2，4，8} 40 {1，2，4} 80 {1，2} 160 {1}

[0184] An association period starts at system frame 0 and lasts for a period of N, an integer multiple of the PRACH configuration period, with a maximum of 160ms, as shown in Table 2. The specific value of N is determined by the following conditions:

[0185] For a specific PRACH configuration period, if its corresponding association period can take multiple values, the smallest one that satisfies the condition that each SSB can be mapped to at least one RO is taken.

[0186] It should be noted that, after an association period, if there are still ROs that are not associated with the SSB, these ROs cannot be used for the random access procedure.

[0187] It can be seen that when configuring RACH related parameters in the 3GPP protocol, it is necessary to ensure that each actually sent SSB is mapped to at least one RO.

[0188] Therefore, extending the SSB scan period has the following impact on RO-related configurations:

[0189] From the base station's perspective, the configuration of the RO timing corresponding to the actual SSB transmitted within each SSB cycle is unaffected. The beam pointing direction for the same SSB index in different SSB cycles is simply different for K different SSB cycles. This only impacts base station development and does not affect the parameters related to the time-frequency domain mapping rules between SSB and RO in the protocol, requiring no parameter expansion.

[0190] 4. Impact on Paging

[0191] In 5G NR, terminal devices only need to wake up during fixed periods to receive paging messages and can sleep the rest of the time to reduce power consumption. The entire wake-up period is called a DRX cycle. A DRX cycle contains N paging frames (PF), and each PF corresponds to Ns paging occasions (PO). Terminal devices wake up only once in a DRX cycle and monitor a specific PO to receive paging messages.

[0192] PF is a radio frame that can contain one or more POs or PO start frames. In a DRX cycle, the start radio frame number (SFN) of the paging frame corresponding to the terminal device is determined by the following formula (3), and the corresponding paging occasion is determined by the following formula (4):

[0193] SFN of PF:

[0194] (SFN+PF_offset)mod T=(T div N)*(UE_ID mod N) (3)

[0195] PO's index (i_s):

[0196] i_s=floor(UE_ID / N)mod Ns (4)

[0197] Where: T is the DRX cycle of the terminal device, i.e., DRX cycle; N is the total number of PFs in a DRX cycle; Ns is the number of POs in a PF; PF_offset is used to determine the offset of the PF; UE_ID is the terminal device identifier. If the terminal device is running in eDRX, it can be obtained through 5G-S-TMSI mod4096. Otherwise, it is equal to 5G-S-TMSI mod 1024 (TMSI is a temporary mobile user identification code of the terminal device, which can be used to uniquely distinguish different terminal devices). The above parameters can be obtained according to the paging configuration PCCH-Config in 38.331. Specifically:

[0198] The value of the paging cycle T is derived from the parameter defaultPagingCycle, which is in units of radio frames (i.e., 10ms) and can be configured as 32, 64, 128, or 256 radio frames. The values ​​of N and PF_offset are derived from the parameter nAndPagingFrameOffset. For example, when T is configured as 64 radio frames, if N is halfT, it means that there are 32 paging frames in a 640ms DRX cycle, with one paging frame for every two radio frames, and the offset of the radio frame is determined by the value of PF_offset being 0 or 1. The value of Ns is derived from the parameter ns, and possible values ​​are 1, 2, or 4. For a certain terminal device, by calculating the PF, the system frame number SFN used to receive the paging message can be determined. Then, by calculating i_s, the terminal device monitors the paging message in the (i_s+1)th PO in the paging frame.

[0199] NR uses multi-beam operation. According to the definition of TS 38.304, PO is a set of Physical Downlink Control Channel (PDCCH) monitoring occasions (MO), which can include multiple time slots (such as subframes or OFDM symbols). Paging DCI can be sent at these times (see TS 38.213). Different monitoring occasions correspond to different transmit beams. The same paging message and the same short message are repeated in all transmit beams. The implementation on the terminal side determines which beam to select for receiving paging messages and short messages. The time domain resources of PDCCH MO are indicated by the pagingSearchSpace specified in TS 38.213 (combined with the CORESET corresponding to the search space, the time and frequency domain resources for receiving PDCCH scrambled by P-RNTI can be specifically determined).

[0200] In existing 3GPP protocols, the SSB cycle is shorter than the DRX paging cycle. By configuring the number of paging frames within the paging cycle and the number of paging opportunities within each paging frame, the paging opportunities of a terminal device within the DRX paging cycle can be dynamically adjusted. When the number of users is large, the base station can improve efficiency by configuring more paging frames. In 38.331, when the SearchSpaceId of the pagingSearchSpace is set to 0 or non-zero, the value of N in the information element nAndPagingFrameOffset is clearly defined.

[0201] When the SSB scanning period is extended, from the perspective of the terminal device, it is equivalent to the SSB period being extended to "K*ssb-periodicityServingCell". Now define every K paging frames as a paging frame group. When calculating the radio frame of the paging frame group where the terminal device is located using formula (3), the value of N should be updated to N using the following formula (5) update .

[0202]

[0203] Update to N update Then, substitute into formula (3) (replacing N in formula (3)) to determine the starting radio frame SFN of the paging frame group in which the terminal device is located. Due to the extension of the scanning period, each paging frame group includes K paging frames to ensure that there are sufficient downlink time domain resources within each paging frame group to arrange the corresponding monitoring opportunities for all SSBs actually transmitted within the K SSB periods. After determining the paging frame group, the time domain position of the PDCCH MO corresponding to the terminal device is configured, which can be defined in the following two implementation methods.

[0204] Implementation method 1: By grouping paging frames

[0205] Specifically, in the paging configuration parameters, K paging frames are used as a paging frame group, each paging frame corresponds to at least one paging opportunity, the number of monitoring opportunities MO configured in each paging opportunity is the same as the number of SSB beams contained in a single SSB set, and the monitoring opportunities MO correspond one-to-one to the SSB beams.

[0206] In practical applications, there is only one SSB beam pointing to the wave position of the terminal device, which corresponds to the lth SSB beam in the kth SSB period, where k∈[1,…,K],l∈[1,…,L max ], k and l are both natural numbers.

[0207] After determining the paging frame group in which the terminal device is located, the paging frame of the terminal device should correspond to the kth paging frame in the current paging frame group, and its radio frame position can be calculated by the following formula (6):

[0208]

[0209] ns POs can be configured in the kth paging frame, and the definitions of ns and PO are consistent with the existing protocol.

[0210] In one example, if Figure 4As shown, N=T / 2; PF_offset=1; K=2; Nupdate=T / 4; SSB period 20ms; SCS=30KHz. After the SSB period is extended by the SSB extension method provided in the embodiment of the present invention, 2 paging frames are used as a paging frame group, each paging frame corresponds to 1 paging opportunity, and in each SSB period, when the number of SSBs actually sent is 6, 6 MOs are configured in each PO, and each MO is mapped to a different SSB.

[0211] It should be noted that Figure 4 In the example shown, one paging occasion is configured in each paging frame. In actual applications, ns paging occasions may be configured in each paging frame. The definition of ns is consistent with the existing protocol, and its value may be 1, 2, or 4.

[0212] This implementation groups paging frames, evenly distributing paging opportunities for terminal devices across all SSBs within a K-SSB period. From the perspective of a terminal device, it only needs to focus on the PDCCH MO corresponding to the lth SSB in the paging opportunity corresponding to the kth paging frame within its own paging frame group. This paging frame grouping method does not require changes to the existing protocol definition of PO.

[0213] Implementation method 2: by expanding the number of POs corresponding to MOs

[0214] Specifically, in the paging configuration parameters, each wake-up cycle configures N update paging frames, each paging frame corresponds to a paging opportunity, each paging opportunity PO includes K search spaces, the number of monitoring opportunities MO configured in each search space is the same as the number of SSB beams contained in a single SSB set, and the x*S+Mth physical downlink control channel PDCCH MO for paging located in the kth search space in PO corresponds to the Mth transmitted SSB;

[0215] Among them, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, X is the number of MOs mapped by an SSB, the value range of x is a natural number between [0, X-1], S is the number of SSB beams contained in an SSB set, and the value range of M is a natural number between [1, S].

[0216] This implementation no longer defines the concept of a paging frame group, and the starting radio frame SFN of the paging frame in which the terminal device is located is determined by formula (5) and formula (3). For ease of configuration, it is defined that there is only one PO (ns=1) in the paging frame, but the PO contains the PDCCH MO corresponding to all SSBs actually transmitted within K SSB periods, and the PO can span multiple SearchSpace periods.

[0217] In one example, if Figure 5 As shown, N=T / 2; PF_offset=1; K=2; Nupdate=T / 4; SSB period 20ms; SCS=30KHz. After the SSB period is extended by the SSB extension method provided in the embodiment of the present invention, T / 4 paging frames are configured, each paging frame corresponds to 1 paging opportunity, and each paging opportunity includes 2 search spaces, namely the search space SS0 and the search space SS1 shown in the figure. In each SSB period, when the number of SSBs actually sent is 6, 12 MOs are configured in each PO, 6 MOs are configured in each search space, and each MO is mapped to an SSB in a different SSB set.

[0218] Specifically, after the SSB scanning period is extended, all terminal devices corresponding to the beam positions of all SSB beams actually transmitted within K SSB periods should have corresponding monitoring opportunities. This means that the number of monitoring opportunities in a paging opportunity (PO) is expanded from the "S*X" defined in the existing protocol (38.304, Section 7.1 explicitly defines the number of MOs in a PO) to "K*S*X." For the definitions of S and X and the parameters from which they are derived, please refer to protocol 38.304.

[0219] From the perspective of resource scheduling, it should be ensured that "K*S*X" MOs are evenly distributed within K SSB cycles, rather than occupying continuous time slot resources, especially when the value of K is relatively large. Therefore, after extending the SSB scanning cycle, it is more appropriate to set the SearchSpaceId of pagingSearchSpace to non-zero. It is clearly stated in NOTE 2 of Section 7.1 of 38.304 that when the SearchSpaceId of pagingSearchSpace is set to non-zero, the PDCCH MO within a PO can span multiple SearchSpace cycles, which ensures that "K*S*X" MOs are evenly distributed within the paging frame (across K SSB cycles or more).

[0220] The definition in the existing protocol 38.304, "The [x*S+M]th PDCCH MO for paging in the PO corresponds to the Mth transmitted SSB, where x = 0, 1, ..., X-1, M = 1, 2, ..., S." can be updated to "When K is greater than 1, that is, when there is an extended scan period, the [x*S+M]th PDCCH MO for paging in the kth SearchSpace period of the PO corresponds to the Mth transmitted SSB, where x = 0, 1, ..., X-1, M = 1, 2, ..., S."

[0221] For the second embodiment described above, ns needs to be set to 1 during parameter configuration. When the number is expanded to "K*S*X", time domain resources are relatively tight. Setting ns to 1 facilitates parameter configuration of the corresponding SearchSpace. The SearchSpaceId of the pagingSearchSpace is set to non-zero. The SearchSpace period can be configured as an SSB period or an integer multiple of the SSB period to ensure that the "K*S*X" MOs are relatively evenly distributed across multiple SSB periods. The kth SearchSpace period contains "S*X" PDCCH MOs to correspond to the Kth transmitted SSB in the kth SSB period.

[0222] It should be noted that, whether in implementation mode 1 or implementation mode 2, when K is greater than 1, both the base station and the terminal device need to ensure that: when configuring nAndPagingFrameOffset, N update Greater than or equal to 1, that is, for the extended scanning period, there is at least one paging frame in one paging cycle. For example, when K is equal to 2, the value of N should be half of that when K is equal to 1 to ensure that there is at least one paging frame in one paging cycle.

[0223] The above describes the SSB extension method on the satellite base station side provided by the embodiment of the present invention and the impact of the SSB cycle extension on various related processes. Figure 6 The SSB extension method provided in an embodiment of the present invention and the corresponding implementation process on the terminal device side are described.

[0224] like Figure 6 As shown, an embodiment of the present invention provides a synchronization signal block (SSB) expansion method, which is applied to a terminal device and includes:

[0225] Step 601: After establishing a connection with a satellite-borne base station, receive a scanning cycle extension coefficient K sent by the satellite-borne base station.

[0226] Step 602: Determine a new SSB scanning period based on the current SSB scanning period and the scanning period expansion coefficient K.

[0227] Step 603: Use the new SSB scanning period to scan and search the SSB beam.

[0228] In specific implementation, the scanning cycle extension coefficient K sent by the satellite base station is received, including:

[0229] Receive the scanning cycle extension coefficient K sent by the satellite base station through the SIB1 message or RRC reconfiguration message.

[0230] In actual applications, before the terminal device establishes a connection with the satellite-borne base station, the terminal device needs to determine the target SSB scanning period based on the pre-configured target scanning period expansion factor and the initial SSB scanning period, and use the target SSB scanning period to scan and search the SSB beam to determine the initial SSB.

[0231] Among them, the target scanning cycle expansion coefficient is the maximum value of at least one pre-configured scanning cycle expansion coefficient. For example, if the pre-configured scanning cycle expansion coefficient includes 4, 8, 16, or 32, the target scanning cycle expansion coefficient is 32. Of course, other scanning cycle expansion coefficients can also be used as the target scanning cycle expansion coefficient in other embodiments of the present invention.

[0232] Among them, before establishing a connection with the satellite base station, that is, before the terminal device receives the SIB1 message sent by the satellite base station, the SSB scanning period of the terminal device is a pre-configured initial SSB scanning period, for example, the initial SSB scanning period is 20ms.

[0233] After establishing a connection with the satellite base station, that is, after the terminal device receives the SIB1 message sent by the satellite base station, the SSB scanning period of the terminal device is determined according to the SIB1 message or RRC reconfiguration message sent by the satellite base station.

[0234] In actual applications, the terminal device also receives paging configuration parameters sent by the satellite base station through SIB1 messages or RRC reconfiguration messages.

[0235] Depending on the way the satellite base station configures the PDCCH MO time domain position, the terminal device can also be divided into two implementation methods when determining the MO based on the paging configuration parameters. Specifically:

[0236] Implementation method 1: The satellite-borne base station configures the MO by grouping the paging frames.

[0237] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame group in which the terminal device is located is determined using formula (7). The paging frame of the terminal device corresponds to the kth paging frame in the paging frame group. The position of the kth paging frame is determined using formula (8). The monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the paging opportunity corresponding to the kth paging frame.

[0238] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) (7)

[0239]

[0240] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0241] Implementation method 2: The satellite-borne base station configures MO by expanding the number of MOs corresponding to PO.

[0242] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame where the terminal device is located is determined using formula (7), and the monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space.

[0243] Among them, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0244] Based on the same inventive concept, Figure 7 As shown, an embodiment of the present invention further provides a synchronization signal block (SSB) expansion device, which is applied to a satellite base station, including:

[0245] The configuration unit 701 is configured to transmit an SSB beam to the current cell using K SSB sets when the number of beams to be served by the satellite-borne base station is greater than the number of SSB beams sent in each SSB period, where the sum of the SSB beams included in the K SSB sets is greater than the number of beams, and K is a natural number greater than 1.

[0246] The sending unit 702 is configured to transmit K SSB sets to the current cell, where beams with the same index in different SSB sets point to different beam positions.

[0247] As an optional implementation manner, each of the K SSB sets contains the same number of SSB beams.

[0248] As an optional implementation manner, the sending unit 702 is further configured to:

[0249] K is sent to the terminal device as the scanning cycle extension coefficient.

[0250] As an optional implementation manner, the sending unit 702 is specifically configured to:

[0251] K is sent to the terminal device as the scanning period extension coefficient through the system message SIB1 or the radio resource control RRC reconfiguration message.

[0252] As an optional implementation manner, the configuration unit 701 is further configured to:

[0253] When the multiplexing pattern between the SSB and the control resource set CORESET0 is configured as multiplexing pattern 1, the SSB scanning period is configured to be greater than or equal to 20 milliseconds.

[0254] As an optional implementation manner, the sending unit 702 is further configured to:

[0255] The configured SSB scanning period is sent to the terminal device through the SIB1 message or RRC reconfiguration message.

[0256] As an optional implementation manner, the configuration unit 701 is further configured to:

[0257] In the paging configuration parameters, K paging frames are used as a paging frame group, each paging frame corresponds to at least one paging opportunity, the number of monitoring opportunities MO configured in each paging opportunity is the same as the number of SSB beams contained in a single SSB set, and the monitoring opportunities MO correspond one to one to the SSB beams.

[0258] As an optional implementation manner, the configuration unit 701 is further configured to:

[0259] In the paging configuration parameters, each wake-up cycle configures N update paging frames, each paging frame corresponds to a paging opportunity, each paging opportunity PO includes K search spaces, the number of monitoring opportunities MO configured in each search space is the same as the number of SSB beams contained in a single SSB set, and the x*S+Mth physical downlink control channel PDCCH MO for paging located in the kth search space in PO corresponds to the Mth transmitted SSB;

[0260] in, N is the total number of paging frames in a pre-configured wake-up cycle, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, X is the number of MOs mapped to an SSB, the value range of x is a natural number between [0, X-1], S is the number of SSB beams contained in an SSB set, and the value range of M is a natural number between [1, S].

[0261] As an optional implementation manner, the sending unit 702 is further configured to:

[0262] The paging configuration parameters are sent to the terminal device via SIB1 message or RRC reconfiguration message.

[0263] Based on the same inventive concept, Figure 8 As shown, an embodiment of the present invention further provides a synchronization signal block SSB expansion device, which is applied to a terminal device, including:

[0264] The receiving unit 801 is configured to receive a scanning cycle extension coefficient K sent by the satellite base station after establishing a connection with the satellite base station;

[0265] The processing unit 802 is configured to determine a new SSB scanning period based on the current SSB scanning period and the scanning period extension coefficient K;

[0266] The search unit 803 is configured to scan and search the SSB beam using a new SSB scanning period.

[0267] As an optional implementation manner, the receiving unit 801 is specifically configured to:

[0268] Receive the scanning cycle extension coefficient K sent by the satellite base station through the SIB1 message or RRC reconfiguration message.

[0269] As an optional implementation manner, the processing unit 802 is further configured to:

[0270] Before establishing a connection with the satellite-borne base station, a target SSB scanning period is determined based on a pre-configured target scanning period extension factor and an initial SSB scanning period;

[0271] The search unit 803 is further configured to: use a target SSB scanning period to scan and search the SSB beam to determine an initial SSB.

[0272] As an optional implementation manner, the target scanning period extension coefficient is a maximum value of at least one pre-configured scanning period extension coefficient.

[0273] As an optional implementation, the current SSB scanning period is determined based on the SIB1 message or RRC reconfiguration message sent by the satellite base station.

[0274] As an optional implementation manner, the receiving unit 801 is further configured to:

[0275] Receive the paging configuration parameters sent by the satellite base station through the SIB1 message or RRC reconfiguration message.

[0276] As an optional implementation manner, the processing unit 802 is further configured to:

[0277] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame group in which the terminal device is located is determined using formula 1. The paging frame of the terminal device corresponds to the k-th paging frame in the paging frame group. The position of the k-th paging frame is determined using formula 2. The monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the l-th SSB in the paging opportunity corresponding to the k-th paging frame.

[0278] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )Formula 1

[0279]

[0280] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0281] As an optional implementation manner, the processing unit 802 is further configured to:

[0282] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame where the terminal device is located is determined using Formula 3. The monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space:

[0283] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )Formula 3

[0284] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0285] Based on the same inventive concept, Figure 9 As shown, on the satellite base station side, an embodiment of the present invention further provides a synchronization signal block SSB expansion device, which includes a processor 900 and a memory 901, the memory 901 is used to store a program executable by the processor 900, and the processor 900 is used to read the program in the memory 901 and execute:

[0286] When the number of wave positions that the satellite base station needs to serve is greater than the number of SSB beams sent in each SSB period, K SSB sets are used to send SSB beams to the current cell. The sum of the SSB beams contained in the K SSB sets is greater than the number of wave positions, and K is a natural number greater than 1.

[0287] K SSB sets are transmitted to the current cell, where beams with the same index in different SSB sets point to different beam positions.

[0288] As an optional implementation manner, each of the K SSB sets contains the same number of SSB beams.

[0289] As an optional implementation, the processor 900 is further configured to execute:

[0290] K is sent to the terminal device as the scanning cycle extension coefficient.

[0291] As an optional implementation manner, the processor 900 is specifically configured to execute:

[0292] K is sent to the terminal device as the scanning period extension coefficient through the system message SIB1 or the radio resource control RRC reconfiguration message.

[0293] As an optional implementation, the processor 900 is further configured to execute:

[0294] When the multiplexing pattern between the SSB and the control resource set CORESET0 is configured as multiplexing pattern 1, the SSB scanning period is configured to be greater than or equal to 20 milliseconds.

[0295] As an optional implementation, the processor 900 is further configured to execute:

[0296] The configured SSB scanning period is sent to the terminal device through the SIB1 message or RRC reconfiguration message.

[0297] As an optional implementation, the processor 900 is further configured to execute:

[0298] In the paging configuration parameters, K paging frames are used as a paging frame group, each paging frame corresponds to at least one paging opportunity, the number of monitoring opportunities MO configured in each paging opportunity is the same as the number of SSB beams contained in a single SSB set, and the monitoring opportunities MO correspond one to one to the SSB beams.

[0299] As an optional implementation, the processor 900 is further configured to execute:

[0300] In the paging configuration parameters, each wake-up cycle configures N updatepaging frames, each paging frame corresponds to a paging opportunity, each paging opportunity PO includes K search spaces, the number of monitoring opportunities MO configured in each search space is the same as the number of SSB beams contained in a single SSB set, and the x*S+Mth physical downlink control channel PDCCH MO for paging located in the kth search space in PO corresponds to the Mth transmitted SSB;

[0301] in, N is the total number of paging frames in a pre-configured wake-up cycle, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, X is the number of MOs mapped to an SSB, the value range of x is a natural number between [0, X-1], S is the number of SSB beams contained in an SSB set, and the value range of M is a natural number between [1, S].

[0302] As an optional implementation, the processor 900 is further configured to execute:

[0303] The paging configuration parameters are sent to the terminal device via SIB1 message or RRC reconfiguration message.

[0304] Based on the same inventive concept, Figure 10 As shown, on the terminal device side, an embodiment of the present invention further provides a synchronization signal block SSB expansion device, which includes a processor 1000 and a memory 1001, the memory 1001 is used to store a program executable by the processor 1000, and the processor 1000 is used to read the program in the memory 1001 and execute:

[0305] After establishing a connection with the satellite base station, receive the scanning cycle extension coefficient K sent by the satellite base station;

[0306] Determine a new SSB scanning period based on the current SSB scanning period and the scanning period extension coefficient K;

[0307] Scan the SSB beam using the new SSB scan period.

[0308] As an optional implementation manner, the processor 1000 is specifically configured to execute:

[0309] Receive the scanning cycle extension coefficient K sent by the satellite base station through the SIB1 message or RRC reconfiguration message.

[0310] As an optional implementation, the processor 1000 is further configured to execute:

[0311] Before establishing a connection with the satellite-borne base station, a target SSB scanning period is determined based on a pre-configured target scanning period extension factor and an initial SSB scanning period;

[0312] The search SSB beam is scanned using the target SSB scan period to determine the initial SSB.

[0313] As an optional implementation manner, the target scanning period extension coefficient is a maximum value of at least one pre-configured scanning period extension coefficient.

[0314] As an optional implementation, the current SSB scanning period is determined based on the SIB1 message or RRC reconfiguration message sent by the satellite base station.

[0315] As an optional implementation, the processor 1000 is further configured to execute:

[0316] Receive the paging configuration parameters sent by the satellite base station through the SIB1 message or RRC reconfiguration message.

[0317] As an optional implementation, the processor 1000 is further configured to execute:

[0318] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame group in which the terminal device is located is determined using formula 1. The paging frame of the terminal device corresponds to the k-th paging frame in the paging frame group. The position of the k-th paging frame is determined using formula 2. The monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the l-th SSB in the paging opportunity corresponding to the k-th paging frame.

[0319] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )Formula 1

[0320]

[0321] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0322] As an optional implementation, the processor 1000 is further configured to execute:

[0323] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame where the terminal device is located is determined using Formula 3. The monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space:

[0324] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )Formula 3

[0325] Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0326] Based on the same inventive concept, an embodiment of the present disclosure provides a computer storage medium, comprising: computer program code. When the computer program code is executed on a computer, the computer executes any of the synchronization signal block (SSB) extension methods discussed above. Because the principles for solving the problem solved by the computer storage medium are similar to those of the synchronization signal block (SSB) extension method, the implementation of the computer storage medium can be referred to as the implementation of the method, and any repetitions will not be repeated here.

[0327] In a specific implementation process, computer storage media may include: Universal Serial Bus Flash Drive (USB), mobile hard disk, Read-Only Memory (ROM), Random Access Memory (RAM), magnetic disk or optical disk, and other storage media that can store program code.

[0328] Based on the same inventive concept, embodiments of the present disclosure further provide a computer program product, comprising: computer program code, which, when executed on a computer, causes the computer to execute any of the synchronization signal block (SSB) extension methods discussed above. Because the principles underlying the problems solved by the aforementioned computer program products are similar to those of the synchronization signal block (SSB) extension methods, the implementation of the aforementioned computer program products may be referenced to the implementation of the methods, and any repetitive details will not be repeated.

[0329] The computer program product can employ any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0330] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0331] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that performs the functions specified in one or more boxes.

[0332] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0333] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0334] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A synchronization signal block (SSB) expansion method, applied to a satellite base station, characterized in that: The method comprises: When the number of beam positions that the satellite-borne base station needs to serve is greater than the number of SSB beams sent in each SSB period, an SSB beam is sent to the current cell using K SSB sets, where the sum of the SSB beams included in the K SSB sets is greater than the number of beam positions, and K is a natural number greater than 1; K SSB sets are transmitted to the current cell, where beams with the same index in different SSB sets point to different beam positions.

2. The method according to claim 1, characterized in that Each of the K SSB sets includes the same number of SSB beams.

3. The method according to claim 1, characterized in that The method further comprises: The K is sent to the terminal device as the scanning period extension coefficient.

4. The method according to claim 3, characterized in that The sending K as a scanning period extension coefficient to the terminal device includes: The K is sent to the terminal device as the scanning period extension coefficient through the system message SIB1 or the radio resource control RRC reconfiguration message.

5. The method according to claim 1, wherein The method further comprises: When the multiplexing pattern between the SSB and the control resource set CORESET0 is configured as multiplexing pattern 1, the SSB scanning period is configured to be greater than or equal to 20 milliseconds.

6. The method according to claim 5, characterized in that The method further comprises: The configured SSB scanning period is sent to the terminal device through the SIB1 message or RRC reconfiguration message.

7. The method according to claim 1, characterized in that The method further comprises: In the paging configuration parameters, K paging frames are used as a paging frame group, each paging frame corresponds to at least one paging opportunity, the number of monitoring opportunities MO configured in each paging opportunity is the same as the number of SSB beams contained in a single SSB set, and the monitoring opportunities MO correspond one-to-one to the SSB beams.

8. The method according to claim 1, characterized in that The method further comprises: In the paging configuration parameters, each wake-up cycle configures N update paging frames, each paging frame corresponds to a paging opportunity, each paging opportunity PO includes K search spaces, the number of monitoring opportunities MO configured in each search space is the same as the number of SSB beams contained in a single SSB set, and the x*S+Mth physical downlink control channel PDCCH MO for paging located in the kth search space in PO corresponds to the Mth transmitted SSB; in, N is the total number of paging frames in a pre-configured wake-up cycle, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, X is the number of MOs mapped to an SSB, the value range of x is a natural number between [0, X-1], S is the number of SSB beams contained in an SSB set, and the value range of M is a natural number between [1, S].

9. The method according to claim 7 or 8, characterized in that The method further comprises: The paging configuration parameters are sent to the terminal device via a SIB1 message or an RRC reconfiguration message.

10. A synchronization signal block (SSB) expansion method, applied to a terminal device, characterized in that: The method comprises: After establishing a connection with the satellite-borne base station, receiving a scanning cycle extension coefficient K sent by the satellite-borne base station; Determining a new SSB scanning period based on the current SSB scanning period and the scanning period extension coefficient K; The SSB beam is scanned and searched using the new SSB scanning period.

11. The method according to claim 10, characterized in that The receiving the scanning period extension coefficient K sent by the satellite-borne base station includes: Receive the scanning period extension coefficient K sent by the satellite-borne base station through a SIB1 message or an RRC reconfiguration message.

12. The method according to claim 10, characterized in that The method further comprises: Before establishing a connection with the satellite-borne base station, determining a target SSB scanning period based on a target scanning period extension factor and an initial SSB scanning period; The search SSB beam is scanned using the target SSB scanning period to determine an initial SSB.

13. The method according to claim 12, characterized in that The target scanning period expansion coefficient is a maximum value of at least one pre-configured scanning period expansion coefficient.

14. The method according to claim 10, characterized in that The current SSB scanning period is determined according to the SIB1 message or RRC reconfiguration message sent by the satellite base station.

15. The method according to claim 10, characterized in that The method further comprises: Receive paging configuration parameters sent by the satellite base station through a SIB1 message or an RRC reconfiguration message.

16. The method according to claim 15, characterized in that The method further comprises: Based on the paging configuration parameters, formula 1 is used to determine the starting radio frame SFN of the paging frame group in which the terminal device is located, the paging frame of the terminal device corresponds to the kth paging frame in the paging frame group, the position of the kth paging frame is determined by formula 2, and the monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the paging opportunity corresponding to the kth paging frame; (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) formula one Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

17. The method according to claim 15, characterized in that The method further comprises: Based on the paging configuration parameters, the starting radio frame SFN of the paging frame where the terminal device is located is determined using Formula 3, and the monitoring opportunity MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space: (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) formula three Among them, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up cycle, K is the scanning cycle expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is the identity of the terminal device, PF_offset is the offset of the paging frame PF, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

18. A synchronization signal block (SSB) expansion device, characterized in that: The device includes a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and execute the steps of any one of the methods according to claims 1-17.

19. A computer storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 17 are implemented.

20. A computer program product, characterized in that The computer program product comprises: computer program code, which enables the computer to execute the steps of any one of the methods according to claims 1 to 17 when the computer program code is run on the computer.

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