Synchronization signal block (SSB) expansion method, device, medium and program product

Abstract

Disclosed in the present application are a synchronization signal block (SSB) expansion method, a device, a medium and a program product, which are used for expanding the number of SSBs and covering more beam positions. The method comprises: when the number of beam positions required to be served by a satellite-borne base station is greater than the number of SSB beams sent in each SSB period, sending SSB beams to the current cell by means of K SSB sets, the sum of SSB beams in the K SSB sets being greater than the number of the beam positions, and K being a natural number greater than 1; and transmitting the K SSB sets to the current cell, wherein the beams of the same index in different SSB sets pointing to different beam positions.

Description

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

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 202410447914.6, filed on April 12, 2024, and entitled "Synchronization signal block (SSB) extension method, device, medium and program product", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of communication technology, in particular to a synchronization signal block (SSB) extension method, device, medium and program product. BACKGROUND

[0004] Synchronization signal block (SSB) is a broadcast beam introduced in the 5th Generation Mobile Communication Technology (5G) New Radio (NR) system, which is composed of a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH).

[0005] In the 5G system, on the one hand, narrow beams can be used to replace the original wide beams through beamforming, so that the horizontal and vertical radiation energy can be accurately aligned to the target user to enhance the coverage capability of the public channel / control channel; on the other hand, different SSB beams are scanned and transmitted at a fixed period through beam scanning technology to realize the coverage of the entire cell and improve the area coverage rate.

[0006] In the 3rd Generation Partnership Project (3GPP) Non-Terrestrial Network (NTN), in the transparent forwarding mode, only local wave position 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 are limited within a system half frame. According to different subcarrier intervals and frequency settings, the maximum number of SSB transmissions within a half frame or a SSB period is 4, 8 or 64.

[0007] Currently, the main development direction of the low-orbit satellite communication system is to provide global broadband access services for ground or low-altitude users. However, the low-orbit satellite has a small size, limited platform resources (such as limited power and limited number of concurrent beams), and uneven distribution of ground services, which brings many challenges to the design of the satellite-ground access scheme requiring global coverage. In the existing technical scheme, the maximum number of SSBs in an SSB set is 4 / 8 / 64, which is difficult to meet the requirement of thousands of beams under global coverage.

[0008] SUMMARY

[0009] The application provides a synchronization signal block (SSB) expansion method, device, medium and program product, which is used to expand the number of SSBs and realize the coverage of more beams.

[0010] In a first aspect, an SSB expansion method provided by an embodiment of the application is applied to a spaceborne base station, and the method comprises the following steps:

[0011] When the number of beams to be served by the spaceborne base station is greater than the number of SSB beams transmitted in each SSB period, K SSB sets are used to transmit SSB beams to the current cell, the sum of SSB beams contained in the K SSB sets is greater than the number of beams, and K is a natural number greater than 1.

[0012] The K SSB sets are transmitted to the current cell, wherein beams with the same index in different SSB sets point to different beams.

[0013] As an exemplary embodiment, the number of SSB beams contained in each SSB set in the K SSB sets is the same.

[0014] As an exemplary embodiment, the method further comprises the following steps:

[0015] The K is sent to a terminal device as a scanning period expansion coefficient.

[0016] As an exemplary embodiment, the sending of the K to the terminal device as the scanning period expansion coefficient comprises the following steps:

[0017] The K is sent to the terminal device as the scanning period expansion coefficient through a system message SIB1 or a radio resource control (RRC) reconfiguration message.

[0018] As an exemplary embodiment, the method further comprises the following steps:

[0019] 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 ms.

[0020] As an exemplary embodiment, the method further comprises:

[0021] The configured SSB scanning period is delivered to the terminal device through an SIB1 message or an RRC reconfiguration message.

[0022] As an exemplary embodiment, the method further comprises:

[0023] In the paging configuration parameter, K paging frames are taken as one paging frame group, each paging frame corresponds to at least one paging occasion, the number of monitoring occasions MO configured in each paging occasion is the same as the number of SSB beams contained in a single SSB set, and the monitoring occasion MO corresponds to an SSB beam one by one.

[0024] As an exemplary embodiment, the method further comprises:

[0025] In the paging configuration parameter, N update paging frames are configured in each wake-up period, each paging frame corresponds to one paging occasion, each paging occasion PO includes K search spaces, the number of monitoring occasions 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+M physical downlink control channel PDCCH MO for paging located in the kth search space in the PO corresponds to the Mth transmitted SSB;

[0026] wherein, N is the total number of paging frames in one pre-configured wake-up period, 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 one SSB, x takes a natural number between 0 and X-1, S is the number of SSB beams contained in one SSB set, and M takes a natural number between 1 and S.

[0027] As an exemplary embodiment, the method further comprises:

[0028] The paging configuration parameter is delivered to the terminal device through an SIB1 message or an RRC reconfiguration message.

[0029] In a second aspect, an embodiment of the present application provides a synchronization signal block SSB extension method, applied to a terminal device, and the method comprises:

[0030] After a connection is established with a spaceborne base station, a scanning period extension coefficient K delivered by the spaceborne base station is received;

[0031] Based on a current SSB scanning period and the scanning period extension coefficient K, a new SSB scanning period is determined;

[0032] Scanning search SSB beams using the new SSB scanning period.

[0033] As an exemplary embodiment, the receiving the scanning period extension coefficient K issued by the satellite base station comprises:

[0034] Receiving the scanning period extension coefficient K issued by the satellite base station through SIB1 message or RRC reconfiguration message.

[0035] As an exemplary embodiment, the method further comprises:

[0036] Before establishing a connection with the satellite base station, determining a target SSB scanning period based on a pre-configured target scanning period extension coefficient and an initial SSB scanning period;

[0037] Using the target SSB scanning period to scan search SSB beams to determine an initial SSB.

[0038] As an exemplary embodiment, the target scanning period extension coefficient is the maximum value in the pre-configured at least one scanning period extension coefficient.

[0039] As an exemplary embodiment, the current SSB scanning period is determined according to the SIB1 message or RRC reconfiguration message issued by the satellite base station.

[0040] As an exemplary embodiment, the method further comprises:

[0041] Receiving the paging configuration parameters issued by the satellite base station through SIB1 message or RRC reconfiguration message.

[0042] As an exemplary embodiment, the method further comprises:

[0043] Based on the paging configuration parameters, determining the starting radio frame SFN of the paging frame group in which the terminal device is located using Formula One, 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 Two, and the monitoring occasion MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the first SSB in the paging occasion corresponding to the kth paging frame.

[0044] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )Formula One

[0045] Wherein, T is the wake-up period of the terminal device, N is the total number of paging frames in a preconfigured wake-up period, K is a scanning period 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.

[0046] As an exemplary embodiment, the method further comprises:

[0047] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame in which the terminal device is located is determined by using Formula Three, and the monitoring occasion MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space:

[0048] (SFN + PF_offset) mod T = (T div N update ) * (UE_ID mod N update ) Formula Three

[0049] Wherein, T is the wake-up period of the terminal device, N is the total number of paging frames in a preconfigured wake-up period, K is a scanning period 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.

[0050] In a third aspect, the embodiments of the present application further provide a synchronization signal block SSB expansion device, comprising:

[0051] The configuration unit is configured to transmit SSB beams to the current cell in K SSB sets when the number of wave positions that need to be served by the satellite base station is greater than the number of SSB beams transmitted in each SSB period, 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.

[0052] The sending unit is configured to transmit the K SSB sets to the current cell, wherein the beams of the same index in different SSB sets point to different wave positions.

[0053] As an exemplary embodiment, the number of SSB beams contained in each SSB set in the K SSB sets is the same.

[0054] As an exemplary embodiment, the sending unit is further configured to:

[0055] The K is sent to the terminal device as a scanning period expansion coefficient.

[0056] As an exemplary embodiment, the sending unit is specifically configured to:

[0057] The K is sent to the terminal device as a scanning period expansion coefficient through a system message SIB1 or a radio resource control RRC reconfiguration message.

[0058] As an exemplary embodiment, the configuration unit is further configured to:

[0059] When a multiplexing pattern between the SSB and a 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.

[0060] As an exemplary embodiment, the sending unit is further configured to:

[0061] The configured SSB scanning period is sent to the terminal device through a SIB1 message or an RRC reconfiguration message.

[0062] As an exemplary embodiment, the configuration unit is further configured to:

[0063] In the paging configuration parameter, K paging frames are taken as one paging frame group, each paging frame corresponds to at least one paging occasion, the number of monitoring occasions MO configured in each paging occasion is the same as the number of SSB beams contained in a single SSB set, and the monitoring occasion MO and the SSB beam one-to-one correspond.

[0064] As an exemplary embodiment, the configuration unit is further configured to:

[0065] In the paging configuration parameter, N update paging frames are configured in each wake-up period, each paging frame corresponds to one paging occasion, each paging occasion PO includes K search spaces, the number of monitoring occasions 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+M physical downlink control channel PDCCH MO for paging located in the kth search space in the PO corresponds to the Mth transmission SSB;

[0066] wherein, N is the total number of paging frames in one pre-configured wake-up period, 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 one SSB, x takes a natural number between 0 and X-1, S is the number of SSB beams contained in one SSB set, and M takes a natural number between 1 and S.

[0067] As an exemplary embodiment, the sending unit is further configured to:

[0068] The paging configuration parameters are delivered to the terminal device through a SIB1 message or an RRC reconfiguration message.

[0069] In a fourth aspect, an embodiment of the present application provides a synchronization signal block (SSB) extension device applied to a terminal device, the device comprising:

[0070] The receiving unit is configured to receive a scanning period extension coefficient K delivered by the spaceborne base station after establishing a connection with the spaceborne base station;

[0071] The processing unit is configured to determine a new SSB scanning period based on a current SSB scanning period and the scanning period extension coefficient K.

[0072] The searching unit is configured to search for an SSB beam using the new SSB scanning period.

[0073] As an exemplary embodiment, the receiving unit is specifically configured to:

[0074] Receive the scanning period extension coefficient K delivered by the spaceborne base station through a SIB1 message or an RRC reconfiguration message.

[0075] As an exemplary embodiment, the processing unit is further configured to:

[0076] Before establishing a connection with the spaceborne base station, determine a target SSB scanning period based on a preconfigured target scanning period extension coefficient and an initial SSB scanning period;

[0077] The searching unit is further configured to search for an SSB beam using the target SSB scanning period to determine an initial SSB.

[0078] As an exemplary embodiment, the target scanning period extension coefficient is a maximum value in at least one preconfigured scanning period extension coefficient.

[0079] As an exemplary embodiment, the current SSB scanning period is determined according to a SIB1 message or an RRC reconfiguration message delivered by the spaceborne base station.

[0080] As an exemplary embodiment, the receiving unit is further configured to:

[0081] Receive paging configuration parameters delivered by the spaceborne base station through a SIB1 message or an RRC reconfiguration message.

[0082] As an exemplary embodiment, the processing unit is further configured to:

[0083] Based on the paging configuration parameters, a starting radio frame SFN of a paging frame group in which the terminal device is located is determined by using Formula One, a paging frame of the terminal device corresponds to a kth paging frame in the paging frame group, a position of the kth paging frame is determined by using Formula Two, and a monitoring occasion MO of the terminal device is a physical downlink control channel PDCCH MO corresponding to an lth SSB in a paging occasion corresponding to the kth paging frame.

[0084] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) Formula One

[0085] wherein T is a wake-up period of the terminal device, N is a total number of paging frames in one wake-up period configured in advance, K is a scanning period expansion coefficient, k is a position of an SSB beam corresponding to the terminal device in K SSB sets, UE_ID is an identity of the terminal device, PF_offset is an offset of a paging frame PF, and l is a position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0086] As an exemplary embodiment, the processing unit is further configured to:

[0087] Based on the paging configuration parameters, a starting radio frame SFN of a paging frame in which the terminal device is located is determined by using Formula Three, and a monitoring occasion MO of the terminal device is a physical downlink control channel PDCCH MO corresponding to an lth SSB in a kth search space:

[0088] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) Formula Three

[0089] wherein T is a wake-up period of the terminal device, N is a total number of paging frames in one wake-up period configured in advance, K is a scanning period expansion coefficient, k is a position of an SSB beam corresponding to the terminal device in K SSB sets, UE_ID is an identity of the terminal device, PF_offset is an offset of a paging frame PF, and l is a position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0090] In a fifth aspect, an apparatus for SSB extension is provided, which comprises a processor and a memory, the memory is configured to store a program executable by the processor, and the processor is configured to read the program in the memory and execute the steps of the method in any one of the first aspect or the second aspect.

[0091] In a sixth aspect, a computer storage medium is provided, which stores a computer program, and the program is executed by a processor to implement the steps of the method in any one of the first aspect or the second aspect.

[0092] In a seventh aspect, a computer program product is provided, which comprises computer program code, and when the computer program code is executed on a computer, the computer is caused to execute the steps of the method in any one of the first aspect or the second aspect.

[0093] These aspects or other aspects of the present application will be made clearer in the following description of embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0094] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0095] Fig. 1 is a schematic diagram of a SSB extension method provided by the embodiments of the present application;

[0096] Fig. 2 is a schematic flow chart of a SSB extension method provided by the embodiments of the present application;

[0097] Fig. 3 is a schematic diagram of a method for determining a listening time slot provided by the embodiments of the present application;

[0098] Fig. 4 is a schematic diagram of a method for configuring a time domain position of a PDCCH MO corresponding to a terminal device provided by the embodiments of the present application;

[0099] Fig. 5 is a schematic diagram of another method for configuring a time domain position of a PDCCH MO corresponding to a terminal device provided by the embodiments of the present application;

[0100] Fig. 6 is a schematic flow chart of another SSB extension method provided by the embodiments of the present application;

[0101] Fig. 7 is a schematic diagram of a SSB extension apparatus provided by the embodiments of the present application;

[0102] FIG. 8 is a schematic diagram of another synchronization signal block SSB extension device provided by an embodiment of the present application;

[0103] FIG. 9 is a schematic diagram of a synchronization signal block SSB extension device provided by an embodiment of the present application;

[0104] FIG. 10 is a schematic diagram of another synchronization signal block SSB extension device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0105] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0106] In the embodiments of the present application, the term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0107] The application scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the emergence of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0108] Before introducing the synchronization signal block SSB extension method provided by the embodiments of the present application, in order to facilitate understanding, the technical background of the embodiments of the present application is first introduced in detail.

[0109] The SSB is a broadcast beam introduced in the fifth generation mobile communication technology 5G NR system, which is composed of PSS, SSS and PBCH.

[0110] In the 5G system, on the one hand, narrow beams can be used to replace the original wide beams through beamforming, so that the horizontal and vertical radiation energy can be accurately aligned to the target user to enhance the coverage capability of the public channel / control channel; on the other hand, through the beam scanning technology means, different SSB beams are scanned and transmitted at a fixed period to realize the coverage of the entire cell and improve the area coverage rate.

[0111] In the transparent forwarding mode in the 3GPP NTN, only the local wave position coverage needs to be considered, and the existing SSB beam design scheme of the 5G NR can still be used. In the time domain, the time slots available for transmitting the synchronization signal block are limited within one system half frame, and according to different subcarrier spacings and frequency settings, the maximum number of SSBs transmitted within a half frame or an SSB period is 4, 8, or 64. Specifically, in the NR, there are many different cases of the time domain mode of SSB transmission, and the transmission of SSBs within one SSB period is limited within a 5 millisecond (ms) half frame window. For the frequency range below 3 gigahertz (GHz), the maximum number of SSBs in an SSB set is 4; for the frequency range of 3 GHz to 6 GHz, the maximum number of SSBs in an SSB set is 8; and for the frequency range of 6 GHz to 52.6 GHz, the maximum number of SSBs in an SSB set is 64, so as 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 prior art scheme is 4, 8, or 64, that is, the maximum number of SSBs within one period can only be covered by scanning 4, 8, or 64 wave positions.

[0112] At present, the main development direction of the low-orbit satellite communication system is to provide global broadband access services for ground or low-altitude users. However, the low-orbit satellite has a small size, limited platform resources (such as limited power and limited number of concurrent beams), and uneven distribution of ground services, which brings many challenges to the design of the satellite-ground access scheme requiring global coverage. The maximum number of SSBs in the SSB set in the prior art scheme is 4 / 8 / 64, which is difficult to meet the requirement of thousands of wave positions under global coverage.

[0113] In view of this, the SSB expansion method, device, medium and program product provided by the embodiments of the present application expand the number of SSBs by means of cross-SSB period, so as to achieve more wave position coverage without changing the SSB time domain resources and the maximum number of SSBs defined in the current 3GPP 5G NR protocol within the half frame window.

[0114] After introducing the technical background of the embodiments of the present application, the invention concept of the SSB expansion scheme provided by the embodiments of the present application will be described in detail below with reference to FIG. 1.

[0115] The SSB extension method provided by the embodiments of the present application can equivalently extend or increase 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 spaceborne base station, the SSB set does not change, but the beams with the same index in different SSB sets point to different ground wave positions until all the wave positions in the entire cell are covered.

[0116] As shown in FIG. 1, the spaceborne base station (gNodeB, gNB) needs to cover 64 wave positions in the current cell, that is, there are 64 wave positions in the coverage range of the current cell. When the subcarrier spacing is 30KHz and the frequency range is 3GHz to 6GHz, taking the SSB time domain mode case C as an example, in each SSB period, the number of SSBs is 8, corresponding to SSB indexes 0-7, which are distributed in the first half frame of each SSB period in time domain.

[0117] The embodiments of the present application extend the SSB scanning period of the terminal device to 8 existing SSB periods. The corresponding 8 beams in each SSB period respectively serve 8 different wave positions. Through 64 SSBs in 8 periods, time division and space division complete the coverage of 64 wave positions and the delivery of synchronization signal blocks. For a terminal device in a certain wave position, it can uniquely specify the corresponding SSB beam through the index of the kth period and the lth (lowercase L) beam in the period.

[0118] After introducing the inventive concept of the embodiments of the present application, the SSB extension method provided by the embodiments of the present application will be described in detail in combination with specific embodiments.

[0119] As shown in FIG. 2, the synchronization signal block SSB extension method provided by the embodiments of the present application, when applied to a spaceborne base station, has the implementation process as shown below:

[0120] Step 201, when the number of wave positions that need to be served by the spaceborne base station 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.

[0121] It should be noted that the number of wave positions that need to be served by the spaceborne base station is usually less than or equal to the total number of wave positions covered by the spaceborne base station. For example, in actual application, according to the configuration of the spaceborne base station, if the spaceborne base station only needs to scan the wave positions in part of the coverage range, the wave positions in this part of the coverage range are the wave positions that need to be served by the spaceborne base station.

[0122] In specific implementation, the number of wave positions that need to be served by the spaceborne base station can be obtained from the configuration parameters of the base station or the cell, or can be determined in a manner in the related art, which is not limited by the embodiments of the present application.

[0123] In actual implementation, when the number of wave positions to be served by the satellite-based base station is greater than the number of SSB beams transmitted in each SSB period, K SSB sets are configured, and the sum of SSB beams contained in the K SSB sets is greater than the number of wave positions to be served by the satellite-based base station. Of course, if the number of wave positions to be served by the satellite-based base station is less than or equal to the number of SSB beams transmitted in each half-frame window in the current SSB transmission time domain mode, one SSB set can be configured, that is, K is equal to 1. Wherein, the SSB set refers to the set of SSB beams transmitted in each SSB period.

[0124] It should be noted that the number of SSB beams contained in each SSB set in the K SSB sets can be the same. For example, the number of wave positions to be served by the satellite-based base station is 90, and the number of SSB beams transmitted in each SSB period is a maximum of 64, and two SSB sets can be configured, each SSB set containing 45 SSB beams. In other embodiments of the present application, the number of SSB beams contained in each SSB set in the K SSB sets can be the same or different. Still assuming that the number of wave positions to be served by the satellite-based base station is 90, and the number of SSB beams transmitted in each SSB period is a maximum of 64, two SSB sets can be configured, one SSB set containing 50 SSB beams and the other SSB set containing 40 SSB beams.

[0125] The determination method of K will be described below taking the number of SSB beams contained in each SSB set in the K SSB sets as an example.

[0126] Suppose that in a cell, the number of wave positions to be served by the satellite-based base station is N b , and the maximum number of SSBs that can be transmitted in each SSB period (or each half-frame window) is L max under certain specific frequency band and subcarrier determination (i.e. under the explicit CaseX of the time domain mode of SSB transmission), and N b > L max At this time, in order to cover the wave positions to be served, K SSB sets need to be configured, wherein K can be obtained by the following formula (1):

[0127] In the equivalent extended period, for a Frequency Division Duplexing (FDD) system, there are K*L max effective SSB beams.

[0128] In actual application, considering resource overhead, there may not be enough resources in the half-frame period to complete L maxtransmit beams simultaneously, and for a 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 are generally not enough downlink time domain resources to complete the L max beam scanning in each SSB period.

[0129] Therefore, the present application defines L as the number of beams actually transmitted in each SSB period after balancing the coverage range and resource overhead. The same SSB extension method is used for FDD and TDD systems. It should be noted that in the same SSB period, the number of beams that can actually be transmitted is different under FDD and TDD systems (because the downlink time slot resources of TDD are less than those of FDD systems). Therefore, when covering the same number of beams, more SSB periods need to be extended under TDD systems.

[0130] Based on the revised number of beams actually transmitted in each SSB period, if the beams need to be served, K is revised as formula (2) as follows:

[0131] It should be noted that in other embodiments of the present application, considering the actual number of SSB beams transmitted in each SSB period L, L max Therefore, when N b > L, that is, the number of beams to be served by the satellite base station is greater than the number of SSB beams that can actually be transmitted in each SSB period, K SSB sets need to be configured, and it is ensured that the sum of the SSB beams contained in the K SSB sets is greater than the number of beams to be served by the satellite base station.

[0132] K can also be referred to as an SSB scanning period extension factor of the terminal device. In other words, the SSB scanning period of the terminal device needs to be extended to K times the original SSB scanning period, and in the entire extended scanning period of the terminal device, there are K*L max effective SSB beam transmission moments, but K*L beams are actually transmitted.

[0133] In specific implementation, the existing information element ssb-PositionsInBurst in the 3GPP 5G NR protocol can be used to indicate which time domain position of the beam is transmitted by the satellite base station in the K SSB periods. Without expanding the bit of ssb-PositionsInBurst, the same bit map is used for the K SSB periods, in which L bits are set to 1, indicating the transmission of the corresponding L SSBs.

[0134] In step 202, K SSB sets are transmitted to the current cell, wherein beams with the same index in different SSB sets point to different wave positions.

[0135] In implementation, when the K SSB sets are transmitted to the current cell, the SSB period related configurations, such as the SSB period length, the time-frequency domain position of the SSB, etc., are not changed. The beams corresponding to each SSB of the satellite base station cover different wave positions in the extended period. That is, in different SSB periods, beams with the same index point to different wave positions.

[0136] In implementation, the satellite base station can also send K to the terminal device as a scanning period extension coefficient to indicate that the terminal device extends its SSB scanning period by K times.

[0137] In implementation, when K is sent to the terminal device as a scanning period extension coefficient, K can be sent to the terminal device as a scanning period extension coefficient through a system message (SystemInformationBlockType1, SIB1) or a radio resource control (Radio Resource Control, RRC) reconfiguration message.

[0138] For the terminal device, the determination of the SSB scanning period can be divided into the following two cases:

[0139] 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 20 ms.

[0140] 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 the RRC reconfiguration message sent by the satellite base station.

[0141] In this way, the terminal device located at a certain wave position in the current cell needs to scan in the extended SSB period for initial beam selection, and select the strongest SSB beam pointing to the current wave position through a related strategy (such as based on reference signal receiving power (Reference Signal Receiving Power, RSRP), etc.).

[0142] Similarly, the paging occasion, random access occasion, etc. related to the SSB configuration need to be adaptively designed. For example, if the strongest beam is located in the kth SSB period, the SSB related operations such as the random access occasion or the paging occasion all use the related occasion corresponding to the kth period.

[0143] Specifically: in the existing 3GPP 5G protocol, the detailed information of SSB (such as period, actual transmission SSB bitmap, etc.) is notified to the terminal device through the SIB1 message or the RRC reconfiguration message. At least the following two information elements are included:

[0144] ssb-PositionsInBurst: indicates the time domain position of the transmitted SSB in the SSB period (in the SSB set within the half frame window). The first bit or the leftmost bit corresponds to SSB index 0, the second bit corresponds to SSB index 1, and so on. If the value in the bitmap is 0, it means that the corresponding SSB is not transmitted; if the value is 1, it means that the corresponding SSB is transmitted.

[0145] ssb-periodicityServingCell: SSB period (in milliseconds) for rate matching purposes, that is, the half frame period of the SSB set. In the existing 3GPP NR, the possible values of the SSB period are defined as 5ms, 10ms, 20ms, 40ms, 80ms, or 160ms. Regardless of the length of the SSB period, the SSB set in each SSB period is concentrated in a 5ms window. If this field does not exist, the terminal device defaults the SSB period to 5ms.

[0146] The above two information elements are defined in ServingCellConfigCommon and ServingCellConfigCommonSIB. The actual SSB scanning period expansion coefficient K of the terminal device can also be defined in a similar way, such as defining an information element "ssb-PeriodCoeff" in ServingCellConfigCommon and ServingCellConfigCommonSIB to indicate and issue to the terminal device, which is explained as follows:

[0147] ssb-PeriodCoeff: actual SSB scanning period expansion coefficient of the UE, that is, the parameter K mentioned in the embodiments of the present application. If in milliseconds (ms), the SSB scanning period of the terminal device is expanded to m = ssb-PeriodCoeff * ssb-periodicityServingCell milliseconds. It indicates that the SSB scanning period of the terminal device can span how many SSB periods. Within the period m milliseconds, there is and only one SSB beam pointing to the terminal device's wave position, assuming it corresponds to the l-th SSB beam in the k-th SSB period, where k ∈ [1, …, K], l ∈ [1, …, L max ], then (k, l) can uniquely represent an SSB within the entire SSB expansion period.

[0148] In the initial downlink synchronization process, before the terminal device receives the SIB1 message, the default SSB period is 20 ms, and the default SSB extension period is the maximum value defined by the cell element "ssb-PeriodCoeff", for example, which can be defined as an integer value of 8, 16, or 32.

[0149] In practical applications, the larger the SSB extension period coefficient K is, the longer the actual SSB scanning period of the terminal device is, and the average access delay, handover delay, and paging delay are all increased accordingly. The more the number of wave positions that a single cell can cover, that is, the larger the coverage area is, the balance between the area coverage rate and the access delay should be considered in actual network deployment to select a specific K value.

[0150] It should be noted that the above method of notifying the terminal device of the SSB period extension coefficient through the element is a cell-level definition, which is consistent for all terminal devices in the cell, and the above method is only an example of definition, and the specific definition of the SSB period extension coefficient in the protocol is not limited by the present application, for example, the SSB period extension coefficient can also be implicitly issued through the high-bit bits of the multiplex frame number.

[0151] The terminal device can directly calculate the position of the terminal device in the SSB extension period, that is, the index k, through the element ssb-PeriodCoeff, the index of the strongest SSB beam received, and the system frame number. In subsequent access and paging schemes, the terminal device only needs to focus on the access occasion, paging occasion, etc. in the SSB period in which the terminal device is located or related to the SSB (i.e. (k, l)) in the SSB period in which the terminal device is located.

[0152] The following describes the influence of the SSB extension scheme provided by the embodiments of the present application on the processes related to SSB or sending SSB in the existing communication system in combination with specific embodiments.

[0153] I. Influence on downlink time-frequency synchronization

[0154] In the existing system, in the initial downlink time-frequency synchronization process, the default SSB period of the terminal device is 20 ms. After extending the SSB scanning period, the influence on the system can be considered from two aspects (taking the SSB period of 20 ms as an example):

[0155] From the perspective of the spaceborne base station, the period of the SSB is still 20 ms, but in different SSB periods, the base station scans different wave position locations, and after K SSB periods, it starts from the first wave position.

[0156] From the perspective of the terminal device, the scanning period of the SSB is extended by K times, that is, in K SSB periods, only one beam will scan to the terminal device located in the wave position. From the perspective of the implementation of the initial cell search development of the terminal device, the terminal device can still use the existing default SSB period of 20 ms processing capability, but needs to process K periods. Therefore, the access delay of the terminal device is increased due to the expansion of the SSB scanning period.

[0157] II. Impact on the time domain configuration of SIB1

[0158] The mapping table of the monitoring occasion of Type0-PDCCH and searchSpaceZero information is defined in Chapter 13 of the protocol 38.213, that is, Table 13-11 to Table 13-15A.

[0159] When the multiplexing pattern between SSB and CORESET0 adopts multiplexing pattern 1, the terminal device monitors Type0-PDCCH in two consecutive slots, and the two consecutive slots are taken as a monitoring window containing the monitoring occasion of Type0-PDCCH, the starting slot number of which is n0, and the period of the monitoring window is 20 ms. In each period, each SSB with index i corresponds to a monitoring window of Type0-PDCCH, and the starting slot number n0 of the monitoring window is determined by the following formula (3):

[0160] Wherein, is the number of slots in a radio frame, and M and O can be obtained according to the searchSpaceZero information and the mapping table of PDCCH monitoring occasion and searchSpaceZero information in Chapter 13 of the protocol 38.213. The lower 4 bits of the pdcch-ConfigSIB1 information field carried by PBCH are used to indicate searchSpaceZero information, and the 4 bits indicate an index in Table 13-11 to Table 13-12. After determining the slot number n0, the radio frame number SFN in which the monitoring window is located also needs to be determined C .

[0161] For the radio frame number SFN C , the protocol 38.213 defines as follows:

[0162] When

[0163] When

[0164] That is, when the number of slots calculated according to is less than the number of slots contained in a radio frame, SFN cSFN is even radio frame; otherwise, SFN is odd radio frame c SFN is even radio frame; otherwise, SFN is odd radio frame

[0165] When the multiplexing pattern between SSB and CORESET0 is multiplexing pattern 2 and 3, the terminal device monitors Type0-PDCCH in one slot, and the period of the monitoring slot is equal to the SSB period. In each monitoring period, the SSB with index i corresponds to the number n of the monitoring slot c and the radio frame number SFN in which it is located c , which is a one-to-one correspondence relationship related to the radio frame and slot in which the SSB is located, and can be determined by the mapping table 13-13 to table 13-15 of the monitoring occasion and searchSpaceZero information.

[0166] Taking table 13-11 corresponding to FR1 as an example, as shown in the following table 1, if index is 4, SSB index is 3, and subcarrier spacing is 30KHz, it can be determined by table lookup that O = 5 and M = 1 at this time. According to the formula, n0 = 13, SFN c is an even frame, then the monitoring slot is 13 and 14, as shown in FIG. 3.

[0167] Table 1

[0168] After extending the scanning period of SSB, the impact on the SIB1 monitoring slot is as follows:

[0169] When the multiplexing pattern between SSB and CORESET0 is multiplexing pattern 1, the period of SIB1 is 20ms, and if the period of SSB is greater than or equal to 20ms, the SIB1 monitoring occasion in the SSB period is sufficient (it can be considered that one SSB corresponds to multiple monitoring occasions on average).

[0170] From the perspective of the space-based station, the SIB1 in each SSB period points to the same beam when it is issued. That is, in K different SSB periods, the information of SIB1 issued is the same, but the beam pointing is different. If the period of SSB is less than 20ms, the SIB1 monitoring occasion in 20ms cannot be one-to-one corresponding to the SSB beam. For example, when the SSB period is 5ms, 4 same SSB indexes in 20ms correspond to 2 monitoring slots. If the 4 SSB beams with the same index point to different beams, the four different beams cannot obtain equal opportunity monitoring slots. Therefore, when the scanning period of SSB is extended, the configuration of the SSB period needs to be greater than or equal to 20ms. The calculation of the slot number n0 and the radio frame number SFN C does not need to be adjusted.

[0171] From the perspective of the terminal device, within every K SSB periods, the terminal device only needs to listen to the SIB1 listening occasion corresponding to the lth SSB beam (the SSB beam corresponding to the wave position where the terminal device is located) in the kth SSB period.

[0172] When the multiplexing pattern between SSB and CORESET0 is multiplexing pattern 2 or multiplexing pattern 3, the period of the monitoring time slot of CORESET0 is equal to the SSB period, and one-to-one correspondence. Therefore, from the perspective of the base station, the wave position pointed to by SIB1 in each SSB period when issued is consistent with the corresponding SSB beam in the current period. From the perspective of the terminal device, within every K SSB periods, the terminal device only needs to listen to the SIB1 listening occasion corresponding to the lth SSB beam (the SSB beam corresponding to the wave position where the terminal device is located) in the kth SSB period, which is the same as the case when the multiplexing pattern is 1.

[0173] In summary, after expanding the SSB scanning period (that is, K>1), the timing of SIB1 is not affected, and only needs to be clear that when the multiplexing pattern between SSB and control resource set CORESET0 is multiplexing pattern 1, the SSB scanning period of the terminal device is greater than or equal to 20 milliseconds through SIB1 message configuration.

[0174] III. Impact on Random Access Occasion

[0175] In NR, only when the beam scanning signal of SSB covers the wave position where the terminal device is located, the terminal device has the opportunity to send the physical random access channel (Physical Random Access Channel, PRACH) random access, that is, the sending time or access occasion (PRACH occasion, RO) of PRACH needs to be mapped with SSB index.

[0176] In order to make each actually sent SSB at least map to one RO, in addition to the PRACH configuration period (that is, x in Table 6.3.3.2-2 to Table 6.3.3.2-4 in protocol 38.211), the concept of association period is defined, and one association period is an integer multiple of the PRACH configuration period. The specific definition and possible values are shown in Table 2.

[0177] Table 2

[0178] An association period starts from system frame 0, and its duration is an integer multiple N of the PRACH configuration period, as shown in Table 2, and the maximum is 160ms. The specific value of N is determined by the following conditions:

[0179] For a certain PRACH configuration period, if its corresponding association period can take multiple values, take the minimum one that satisfies the condition that each SSB can be mapped to at least one RO.

[0180] It should be noted that after an association period, if there are still ROs that are not associated with SSBs, these ROs cannot be used for random access procedures.

[0181] Therefore, in the 3GPP protocol, when configuring the parameters related to the random access channel (RACH), it is necessary to ensure that each actually transmitted SSB is mapped to at least one RO.

[0182] Therefore, extending the SSB scanning period has the following effects on the configuration of ROs:

[0183] From the perspective of the base station, the configuration of the RO occasion corresponding to the actually transmitted SSB in each SSB period is not affected. Only the beam direction of the same SSB index in different SSB periods needs to be different in K different SSB periods. Here, only the development on the base station side is affected, and the parameters related to the time-frequency domain mapping rules of SSB and RO in the protocol do not need to be expanded.

[0184] Four, the impact on paging

[0185] In 5G NR, the terminal device only needs to wake up at a fixed time to receive the paging message, and can sleep at other times to reduce power consumption. The entire wake-up period is called the discontinuous reception (DRX) cycle (DRX cycle). There are N paging frames (PF) in a DRX cycle, and each PF corresponds to Ns paging occasions (PO). The terminal device only wakes up once in a DRX cycle and listens to a certain PO to receive the paging message.

[0186] PF is a radio frame, which can contain one or more POs or the starting frame of the PO. In a DRX cycle, the starting radio frame (SFN) of the corresponding paging frame of the terminal device is determined by formula (3) below, and the corresponding paging occasion is determined by formula (4) below:

[0187] SFN of PF:

[0188] (SFN+PF_offset)mod T=(T div N)*(UE_ID mod N) (3)

[0189] Index (i_s) of PO:

[0190] i_s = floor (UE_ID / N) mod Ns (4)

[0191] wherein T is a DRX cycle of the terminal device, N is a total number of PFs in one DRX cycle, Ns is a number of POs in one PF, PF_offset is used to determine an offset of the PF, UE_ID is a terminal device identifier, which can be obtained by 5G-S-TMSI mod 4096 if the terminal device is running in eDRX, otherwise, it is equal to 5G-S-TMSI mod 1024 (TMSI is a temporary mobile subscriber identity 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:

[0192] The value of the paging cycle T is derived from the parameter defaultPagingCycle, which is configured in units of radio frames (i.e., 10 ms) 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 configured as halfT, it means that there are 32 paging frames in one 640 ms DRX cycle, and every two radio frames have one paging frame, and the offset of the radio frame is determined by PF_offset taking the value of 0 or 1; the value of Ns is derived from the parameter ns, which can take the values of 1, 2, or 4. For a certain terminal device, by calculating the PF, the system frame number SFN for receiving the paging message can be determined, and then by calculating i_s, the terminal device monitors the paging message in the (i_s+1)th PO in the paging frame.

[0193] NR adopts multi-beam operation, according to the definition of TS 38.304, PO is a set of physical downlink control channel (Physical Downlink Control Channel, PDCCH) monitoring occasions (Monitoring Occasion, MO), which can contain multiple time slots (such as subframes or OFDM symbols), and paging DCI (see TS 38.213) can be sent in these occasions. Different monitoring occasions correspond to different transmission beams, and the same paging message and the same short message are repeated in all transmission beams, and the selection of which beam to use to receive the paging message and the short message is determined by the implementation on the terminal device side. The time domain resources of PDCCH MO are indicated by pagingSearchSpace specified in TS 38.213 (plus the CORESET corresponding to the search space, which can specifically determine the time-frequency domain resources of the PDCCH scrambled by P-RNTI).

[0194] In the existing 3GPP protocol, the SSB period is less than the paging period of DRX, and by configuring the number of paging frames in the paging period and the number of paging occasions in each paging frame, the paging occasion of a certain terminal device in the DRX paging period can be dynamically adjusted. When the user volume is relatively large, the base station side can configure more paging frames to improve efficiency. In 38.331, when the SearchSpaceId of pagingSearchSpace is set to 0 and non-0, the value of N in the information element nAndPagingFrameOffset is defined.

[0195] When the SSB scanning period is extended, from the perspective of the terminal device, the equivalent SSB period is extended to “K*ssb-periodicityServingCell”. It is defined that every K paging frames are a paging frame group. When calculating the radio frame of the paging frame group where the terminal device is located by formula (3), the value of N should be updated to N update .

[0196] updated to N update Then, the starting radio frame SFN of the paging frame group where the terminal device is located is determined by formula (3) (instead of N in formula (3)). Due to the extension of the scanning period, each paging frame group includes K paging frames to ensure that there are enough downlink time domain resources in each paging frame group to arrange the listening occasions corresponding to all actually transmitted SSBs in K SSB periods. After determining the paging frame group, the time domain position of the PDCCH MO corresponding to the terminal device can be defined by the following two implementation modes.

[0197] Implementation mode one: by grouping paging frames

[0198] Specifically, in the paging configuration parameters, K paging frames are taken as a paging frame group, each paging frame corresponds to at least one paging occasion, the number of monitoring occasions MO configured in each paging occasion is the same as the number of SSB beams contained in a single SSB set, and the monitoring occasion MO corresponds to the SSB beam one by one.

[0199] In actual application, 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.

[0200] 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 the radio frame position thereof can be calculated by the following formula (6):

[0201] The kth paging frame can be configured with ns POs, and ns and the definition of the PO are consistent with the existing protocol.

[0202] In one example, as shown in FIG. 4, N=T / 2; PF_offset=1; K=2; Nupdate=T / 4; the SSB period is 20 ms; SCS=30KHz; after the SSB period is extended by using the SSB extension method provided in the present application, 2 paging frames are taken as a paging frame group, each paging frame corresponds to 1 paging occasion, and when the actual number of SSBs transmitted in each SSB period is 6, 6 MOs are configured in each PO, and each MO is mapped to a different SSB.

[0203] It should be noted that in the example shown in FIG. 4, one paging occasion is configured in each paging frame, and in actual application, ns paging occasions can be configured in each paging frame, and the definition of ns is consistent with the existing protocol, and the value thereof can be 1, 2, or 4.

[0204] In this implementation, by grouping paging frames, the paging opportunities of the terminal devices on the wave positions corresponding to all SSBs in K SSB periods are evenly distributed. From the perspective of a certain terminal device, only the PDCCH MO corresponding to the lth SSB in the kth paging occasion in the paging frame group in which the terminal device is located needs to be concerned. The grouping mode of the paging frames does not need to change the definition of the PO in the existing protocol.

[0205] Implementation mode two, by extending the number of MOs corresponding to the PO

[0206] Specifically, in the paging configuration parameters, N updateone paging occasion, each paging occasion PO includes K search spaces, the number of monitoring occasions MO configured in each search space is the same as the number of SSB beams contained in a single SSB set, and the xth MO in the kth search space in the PO corresponds to the Mth transmitted SSB;

[0207] wherein 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 one SSB, x is a natural number in the range of [0, X-1], S is the number of SSB beams contained in one SSB set, and M is a natural number in the range of [1, S].

[0208] This embodiment no longer defines the concept of 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). In order to facilitate configuration, it is defined that there is only one PO (ns=1) in a paging frame, but the PO contains PDCCH MOs corresponding to all actually transmitted SSBs in K SSB periods, and the PO can span multiple SearchSpace periods.

[0209] In one example, as shown in FIG. 5, N=T / 2; PF_offset=1; K=2; Nupdate=T / 4; SSB period 20ms; SCS=30KHz, after extending the SSB period by using the SSB extension method provided in the present application, T / 4 paging frames are configured, each paging frame corresponds to one paging occasion, each paging occasion includes two search spaces, i.e., search space SS0 and search space SS1 shown in the figure, when the number of actually transmitted SSBs in each SSB period 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.

[0210] Specifically, after extending the SSB scanning period, the terminal device on the beam corresponding to all actually transmitted SSB beams in K SSB periods should have a corresponding monitoring occasion. That is, the number of monitoring occasions in one paging occasion PO is expanded from “S*X” (38.304, chapter 7.1 clearly defines the number of MOs in one PO) in the existing protocol to “K*S*X”, wherein the definitions of S and X and the source of which parameter, please refer to the protocol 38.304.

[0211] From the perspective of resource scheduling, the K*S*X MOs should be evenly distributed in the K SSB periods, rather than occupying continuous time slot resources, especially when K is large. Therefore, after extending the SSB scanning period, it is more appropriate to set the SearchSpaceId of pagingSearchSpace to a non-zero value. In NOTE 2 in section 7.1 of 38.304, it is explicitly stated that when the SearchSpaceId of pagingSearchSpace is set to a non-zero value, the PDCCH MOs in a PO can span multiple SearchSpace periods, which ensures the even distribution of the K*S*X MOs in the paging frame (across K SSB periods or more).

[0212] The existing protocol 38.304 defines that the [x*S+M]th PDCCH MO for paging in a PO corresponds to the Mth transmitted SSB, where x=0, 1, …, X-1, M=1, 2, …, S. It can be updated to: when K is greater than 1, i.e., there is an extended scanning 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.

[0213] For the above-mentioned embodiment two, when the number is expanded to “K*S*X”, the time domain resource is relatively tight, and ns is set to 1 for convenient parameter configuration of the corresponding SearchSpace when configuring parameters. The SearchSpaceId of pagingSearchSpace is set to a non-zero value. The SearchSpace period can be configured as an SSB period or an integer multiple of an SSB period, to ensure that the K*S*X MOs are evenly distributed in multiple SSB periods. The kth SearchSpace period contains S*X PDCCH MOs to correspond to the Kth transmitted SSB in the kth SSB period.

[0214] It should be noted that, whether it is the first embodiment or the second embodiment, when K is greater than 1, the base station and the terminal device need to ensure that when configuring nAndPagingFrameOffset, N update is greater than or equal to 1, i.e., to ensure that for the extended scanning period, there is at least one paging frame in a paging period. 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 a paging period.

[0215] The SSB extension method provided by the embodiment of the present application on the satellite base station side and the influence of the SSB period extension on each related process are described above. The SSB extension method provided by the embodiment of the present application and the corresponding implementation process on the terminal device side are described below in combination with FIG. 6.

[0216] As shown in FIG. 6, the present application provides a synchronization signal block (SSB) extension method, applied to a terminal device, including:

[0217] Step 601, after establishing a connection with a satellite base station, receiving a scanning period extension coefficient K issued by the satellite base station.

[0218] Step 602, determining a new SSB scanning period based on the current SSB scanning period and the scanning period extension coefficient K.

[0219] Step 603, scanning and searching for an SSB beam using the new SSB scanning period.

[0220] In a specific implementation, receiving the scanning period extension coefficient K issued by the satellite base station includes:

[0221] Receiving the scanning period extension coefficient K issued by the satellite base station through a SIB1 message or an RRC reconfiguration message.

[0222] In actual application, before the terminal device establishes a connection with the satellite base station, the terminal device needs to determine a target SSB scanning period based on a pre-configured target scanning period extension coefficient and an initial SSB scanning period, and scan and search for an SSB beam using the target SSB scanning period to determine an initial SSB.

[0223] The target scanning period extension coefficient is the maximum value of at least one pre-configured scanning period extension coefficient. For example, if the pre-configured scanning period extension coefficients include 4, 8, 16, or 32, the target scanning period extension coefficient is 32. Of course, other scanning period extension coefficients can also be taken as the target scanning period extension coefficient in other embodiments of the present application.

[0224] Before establishing a connection with the satellite base station, that is, before the terminal device receives the SIB1 message issued 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 20 ms.

[0225] After establishing a connection with the satellite base station, that is, after the terminal device receives the SIB1 message issued by the satellite base station, the SSB scanning period of the terminal device is determined according to the SIB1 message or the RRC reconfiguration message issued by the satellite base station.

[0226] In actual application, the terminal device further receives the paging configuration parameter sent by the satellite base station through the SIB1 message or the RRC reconfiguration message.

[0227] According to different ways of configuring the time domain position of the PDCCH MO by the satellite base station, when determining the MO according to the paging configuration parameter, the terminal device can also be divided into two implementation manners, specifically:

[0228] Implementation manner one: the satellite base station configures the MO by grouping the paging frames.

[0229] Based on the paging configuration parameter, the starting radio frame SFN of the paging frame group in which the terminal device is located is determined by 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 by using formula (8), and the monitoring occasion MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the paging occasion corresponding to the kth paging frame.

[0230] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update )(7)

[0231] Wherein, T is the wake-up period of the terminal device, N is the total number of paging frames in a pre-configured wake-up period, K is a scanning period expansion coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB set, 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.

[0232] Implementation manner two: the satellite base station configures the MO by expanding the number of MOs corresponding to the PO.

[0233] Based on the paging configuration parameter, the starting radio frame SFN of the paging frame in which the terminal device is located is determined by using formula (7), and the monitoring occasion MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space.

[0234] Wherein, k is the position of the SSB beam corresponding to the terminal device in the K SSB set, and l is the position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0235] Based on the same inventive concept, as shown in FIG. 7, the embodiment of the present application further provides a synchronization signal block SSB expansion device, applied to a satellite base station, comprising:

[0236] The configuration unit 701 is configured to transmit SSB beams to the current cell in K SSB sets when the number of wave positions that need to be served by the satellite base station is greater than the number of SSB beams transmitted in each SSB period, the sum of 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.

[0237] The transmission unit 702 is configured to transmit the K SSB sets to the current cell, wherein the beams with the same index in different SSB sets point to different wave positions.

[0238] As an exemplary embodiment, the number of SSB beams contained in each of the K SSB sets is the same.

[0239] As an exemplary embodiment, the transmission unit 702 is further configured to:

[0240] Distribute K to the terminal device as a scanning period expansion coefficient.

[0241] As an exemplary embodiment, the transmission unit 702 is specifically configured to:

[0242] Distribute K to the terminal device as a scanning period expansion coefficient through a system message SIB1 or a radio resource control RRC reconfiguration message.

[0243] As an exemplary embodiment, the configuration unit 701 is further configured to:

[0244] When the multiplexing pattern between the SSB and the control resource set CORESET0 is configured as multiplexing pattern 1, configure the SSB scanning period to be greater than or equal to 20 milliseconds.

[0245] As an exemplary embodiment, the transmission unit 702 is further configured to:

[0246] Distribute the configured SSB scanning period to the terminal device through an SIB1 message or an RRC reconfiguration message.

[0247] As an exemplary embodiment, the configuration unit 701 is further configured to:

[0248] In the paging configuration parameter, K paging frames are taken as one paging frame group, each paging frame corresponds to at least one paging occasion, the number of monitoring occasions MO configured in each paging occasion is the same as the number of SSB beams contained in a single SSB set, and each monitoring occasion MO corresponds to one SSB beam.

[0249] As an exemplary embodiment, the configuration unit 701 is further configured to:

[0250] In the paging configuration parameter, N updateone paging frame, each paging frame corresponds to one paging occasion, each paging occasion PO includes K search spaces, the number of monitoring occasions 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+M physical downlink control channel PDCCH MO for paging located in the kth search space in the PO corresponds to the Mth transmitted SSB;

[0251] wherein, N is the total number of paging frames in a pre-configured wake-up period, 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 one SSB, x is a natural number in the range of [0, X-1], S is the number of SSB beams contained in one SSB set, and M is a natural number in the range of [1, S].

[0252] As an exemplary embodiment, the sending unit 702 is further configured to:

[0253] The paging configuration parameters are delivered to the terminal device through a SIB1 message or an RRC reconfiguration message.

[0254] Based on the same inventive concept, as shown in FIG. 8, the present application also provides a synchronization signal block SSB extension device, applied to a terminal device, comprising:

[0255] The receiving unit 801 is configured to receive the scanning period extension coefficient K delivered by the spaceborne base station after establishing a connection with the spaceborne base station.

[0256] 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.

[0257] The searching unit 803 is configured to scan and search for SSB beams using the new SSB scanning period.

[0258] As an exemplary embodiment, the receiving unit 801 is specifically configured to:

[0259] The receiving unit 801 is configured to receive the scanning period extension coefficient K delivered by the spaceborne base station through a SIB1 message or an RRC reconfiguration message.

[0260] As an exemplary embodiment, the processing unit 802 is further configured to:

[0261] Before establishing a connection with the spaceborne base station, the target SSB scanning period is determined based on the pre-configured target scanning period extension coefficient and the initial SSB scanning period.

[0262] The searching unit 803 is further configured to scan and search for SSB beams using the target SSB scanning period to determine the initial SSB.

[0263] As an exemplary embodiment, the target scanning period extension coefficient is the maximum value in the at least one pre-configured scanning period extension coefficient.

[0264] As an exemplary embodiment, the current SSB scanning period is determined according to the SIB1 message or the RRC reconfiguration message issued by the satellite base station.

[0265] As an exemplary embodiment, the receiving unit 801 is further configured to:

[0266] Receive the paging configuration parameters issued by the satellite base station through the SIB1 message or the RRC reconfiguration message.

[0267] As an exemplary embodiment, the processing unit 802 is further configured to:

[0268] Based on the paging configuration parameters, determine the starting radio frame SFN of the paging frame group in which the terminal device is located by using Formula One, 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 using Formula Two, and the monitoring occasion MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the paging occasion corresponding to the kth paging frame.

[0269] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) Formula One

[0270] Wherein, T is the wake-up period of the terminal device, N is the total number of paging frames in one pre-configured wake-up period, K is the scanning period extension coefficient, k is the position of the SSB beam corresponding to the terminal device in the K SSB set, 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.

[0271] As an exemplary embodiment, the processing unit 802 is further configured to:

[0272] Based on the paging configuration parameters, determine the starting radio frame SFN of the paging frame in which the terminal device is located by using Formula Three, and the monitoring occasion MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space:

[0273] (SFN+PF_offset)mod T=(T div N update) x (UE_ID mod N update ) Equation Three

[0274] wherein T is a wake-up period of the terminal device, N is a total number of paging frames in a pre-configured wake-up period, K is a scanning period expansion coefficient, k is a position of the SSB beam corresponding to the terminal device in the K SSB sets, UE_ID is an identity of the terminal device, PF_offset is an offset of a paging frame PF, and l is a position of the SSB beam corresponding to the terminal device in the kth SSB set.

[0275] Based on the same inventive concept, as shown in FIG. 9, on the satellite base station side, the application also provides a synchronization signal block SSB expansion device, which comprises a processor 900 and a memory 901, the memory 901 is configured to store programs executable by the processor 900, and the processor 900 is configured to read the programs in the memory 901 and execute:

[0276] When the number of wave positions that need to be served by the satellite base station is greater than the number of SSB beams sent in each SSB period, the SSB beams are sent to the current cell in K SSB sets, 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.

[0277] Transmitting the K SSB sets to the current cell, wherein the beams with the same index in different SSB sets point to different wave positions.

[0278] As an exemplary embodiment, the number of SSB beams contained in each of the K SSB sets is the same.

[0279] As an exemplary embodiment, the processor 900 is further configured to execute:

[0280] Distribute K as a scanning period expansion coefficient to the terminal device.

[0281] As an exemplary embodiment, the processor 900 is specifically configured to execute:

[0282] Distribute K as a scanning period expansion coefficient to the terminal device through a system message SIB1 or a radio resource control RRC reconfiguration message.

[0283] As an exemplary embodiment, the processor 900 is further configured to execute:

[0284] When the multiplexing pattern between the SSB and the control resource set CORESET0 is configured as multiplexing pattern 1, configure the SSB scanning period to be greater than or equal to 20 milliseconds.

[0285] As an exemplary implementation, the processor 900 is further configured to perform:

[0286] The configured SSB scanning period is delivered to the terminal device through an SIB1 message or an RRC reconfiguration message.

[0287] As an exemplary implementation, the processor 900 is further configured to perform:

[0288] In the paging configuration parameter, K paging frames are taken as one paging frame group, each paging frame corresponds to at least one paging occasion, the number of monitoring occasions MO configured in each paging occasion is the same as the number of SSB beams contained in a single SSB set, and the monitoring occasion MO corresponds to the SSB beam one by one.

[0289] As an exemplary implementation, the processor 900 is further configured to perform:

[0290] In the paging configuration parameter, N update paging frames are configured in each wake-up period, each paging frame corresponds to one paging occasion, each paging occasion PO includes K search spaces, the number of monitoring occasions 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+M physical downlink control channel PDCCH MO for paging located in the kth search space in the PO corresponds to the Mth transmitted SSB;

[0291] wherein, N is the total number of paging frames in one pre-configured wake-up period, 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 one SSB, x takes a natural number between 0 and X-1, S is the number of SSB beams contained in one SSB set, and M takes a natural number between 1 and S.

[0292] As an exemplary implementation, the processor 900 is further configured to perform:

[0293] The paging configuration parameter is delivered to the terminal device through an SIB1 message or an RRC reconfiguration message.

[0294] Based on the same inventive concept, as shown in FIG. 10, on the terminal device side, the present application also provides a synchronization signal block SSB extension device, which comprises a processor 1000 and a memory 1001, the memory 1001 is configured to store programs executable by the processor 1000, and the processor 1000 is configured to read the programs in the memory 1001 and perform:

[0295] After establishing a connection with the spaceborne base station, a scanning period extension coefficient K delivered by the spaceborne base station is received;

[0296] determining a new SSB scanning period based on the current SSB scanning period and the scanning period extension coefficient K;

[0297] scanning for searching SSB beams using the new SSB scanning period.

[0298] As an exemplary embodiment, the processor 1000 is specifically configured to perform:

[0299] receiving the scanning period extension coefficient K issued by the spaceborne base station through a SIB1 message or an RRC reconfiguration message.

[0300] As an exemplary embodiment, the processor 1000 is further configured to perform:

[0301] determining a target SSB scanning period based on a pre-configured target scanning period extension coefficient and an initial SSB scanning period before establishing a connection with the spaceborne base station;

[0302] scanning for searching SSB beams using the target SSB scanning period to determine an initial SSB.

[0303] As an exemplary embodiment, the target scanning period extension coefficient is the maximum value in the pre-configured at least one scanning period extension coefficient.

[0304] As an exemplary embodiment, the current SSB scanning period is determined according to the SIB1 message or the RRC reconfiguration message issued by the spaceborne base station.

[0305] As an exemplary embodiment, the processor 1000 is further configured to perform:

[0306] receiving the paging configuration parameters issued by the spaceborne base station through the SIB1 message or the RRC reconfiguration message.

[0307] As an exemplary embodiment, the processor 1000 is further configured to perform:

[0308] determining the starting radio frame SFN of the paging frame group in which the terminal device is located based on the paging configuration parameters using Formula One, the paging frame of the terminal device corresponding to the kth paging frame in the paging frame group, the position of the kth paging frame being determined using Formula Two, and the monitoring occasion MO of the terminal device being the physical downlink control channel PDCCH MO corresponding to the first SSB in the paging occasion corresponding to the kth paging frame;

[0309] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) Formula One

[0310] wherein T is a wake-up period of the terminal device, N is a total number of paging frames in a pre-configured wake-up period, K is a scanning period expansion coefficient, k is a position of the SSB beam corresponding to the terminal device in the K SSBs, UE_ID is an identity of the terminal device, PF_offset is an offset of a paging frame PF, and l is a position of the SSB beam corresponding to the terminal device in the kth SSB.

[0311] As an exemplary embodiment, the processor 1000 is further configured to perform:

[0312] Based on the paging configuration parameters, the starting radio frame SFN of the paging frame in which the terminal device is located is determined by using Formula Three, and the monitoring occasion MO of the terminal device is a physical downlink control channel PDCCH MO corresponding to the lth SSB in the kth search space:

[0313] (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) Formula Three

[0314] wherein T is a wake-up period of the terminal device, N is a total number of paging frames in a pre-configured wake-up period, K is a scanning period expansion coefficient, k is a position of the SSB beam corresponding to the terminal device in the K SSBs, UE_ID is an identity of the terminal device, PF_offset is an offset of a paging frame PF, and l is a position of the SSB beam corresponding to the terminal device in the kth SSB.

[0315] Based on the same inventive concept, the disclosure provides a computer storage medium, which includes computer program code, when the computer program code is run on a computer, the computer program code causes the computer to execute any one of the synchronization signal block SSB extension methods discussed above. Since the above computer storage medium solves problems by the same principle as the synchronization signal block SSB extension method, the implementation of the above computer storage medium can be referred to the implementation of the method, and the repeated parts will not be described here.

[0316] In the specific implementation process, the computer storage medium can include a universal serial bus flash drive (USB, Universal Serial Bus Flash Drive), a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various storage media that can store program codes.

[0317] Based on the same inventive concept, the embodiments of the present disclosure further provide a computer program product, which comprises computer program codes, and when the computer program codes run on a computer, the computer is caused to execute the synchronization signal block SSB extension method of any one of the preceding embodiments. Since the above computer program product solves problems in the same principle as the synchronization signal block SSB extension method, the implementation of the above computer program product can be referred to the implementation of the method, and the repeated parts will not be described here.

[0318] The computer program product can adopt 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 may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include an electrical connection having 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 of the above.

[0319] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage, etc.) containing computer-usable program codes.

[0320] The present application is described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows 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 the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce the device for implementing the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0321] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart or flow diagram block or blocks and / or the flowchart or flow diagram block or blocks.

[0322] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart or flow diagram block or blocks.

[0323] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A synchronization signal block (SSB) extension method, applied to a satellite-borne base station, comprising: 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; The 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, wherein Each of the K SSB sets includes the same number of SSB beams.

3. The method according to claim 1, wherein 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, wherein: The sending K as a scanning period extension coefficient to the terminal device includes: The K is sent to the terminal device as a 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, wherein: The method further comprises: The configured SSB scanning period is sent to the terminal device through the SIB1 message or the RRC reconfiguration message.

7. The method according to claim 1, wherein 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, wherein 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, wherein 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) extension method, applied to a terminal device, the method comprising: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein 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, wherein 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 occasion MO of the terminal device is the physical downlink control channel PDCCH MO corresponding to the lth SSB in the paging occasion corresponding to the kth paging frame; (SFN+PF_offset)mod T=(T div N update )×(UE_ID mod N update ) formula one Wherein, 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, wherein: The method further comprises: Based on the paging configuration parameters, the starting radio frame SFN of the paging frame in which 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 Wherein, 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, and k is the corresponding The position of the SSB beam 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, comprising a processor and a memory, wherein the memory is configured to store a program executable by the processor, and the processor is configured to read the program in the memory and execute the steps of any one of the methods described in claims 1-17.

19. A computer storage medium having a computer program stored thereon, wherein 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, comprising: Computer program code, when the computer program code is run on a computer, causes the computer to perform the steps of the method according to any one of claims 1 to 17.

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