Wireless communication method and apparatus, device, and storage medium

Abstract

A wireless communication method and apparatus, a device, and a storage medium, relating to the technical field of communications. The method comprises: within a first period, receiving an SSB sent by a network device, the first period being longer than or equal to 20 ms (310). By means of the method, within the first period, a terminal device receives the SSB sent by the network device, the first period is longer than or equal to 20 ms, and an SSB period is extended to the first period, so that the terminal device can receive the SSB within the first period, thereby avoiding cell search failure, and improving the communication efficiency.

Description

Wireless communication method, device, equipment and storage medium Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to a wireless communication method, apparatus, device, and storage medium. Background Art

[0002] In NTN (Non-Terrestrial Network) systems, network equipment has a large coverage area, requiring a large number of beams to meet coverage requirements. Given the limited transmit power and processing capabilities of network equipment, it's difficult to simultaneously activate too many beams. Therefore, beam scanning can be used to provide service to cells covered by network equipment. For example, beam scanning can be used to send Synchronization Signal / Physical Broadcast Channel Blocks (SSBs) to cells.

[0003] In the related art, for initial cell selection, the terminal device assumes that the SSB period is 20ms. However, the beam corresponding to the terminal device may not be illuminated within 20ms to transmit the SSB, resulting in the terminal device failing to search the cell.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a wireless communication method, apparatus, device, and storage medium. The technical solution is as follows:

[0006] According to one aspect of an embodiment of the present application, a wireless communication method is provided, the method being performed by a terminal device, the method comprising:

[0007] An SSB sent by a network device is received within a first period, where the first period is greater than or equal to 20 milliseconds.

[0008] According to one aspect of an embodiment of the present application, a wireless communication method is provided, where the method is performed by a network device, and the method includes:

[0009] The SSB is sent to the cell where the terminal device is located based on a first period, where the first period is greater than or equal to 20 milliseconds.

[0010] According to one aspect of an embodiment of the present application, a wireless communication device is provided, the device including:

[0011] The receiving module is used to receive the SSB sent by the network device within a first period, where the first period is greater than or equal to 20 milliseconds.

[0012] According to one aspect of an embodiment of the present application, a wireless communication device is provided, the device including:

[0013] The sending module is used to send SSB to the cell where the terminal device is located based on a first period, and the first period is greater than or equal to 20 milliseconds.

[0014] According to one aspect of an embodiment of the present application, a communication device is provided, comprising a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to implement the wireless communication method described above. The communication device is a terminal device, or the communication device is a network device.

[0015] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored. The computer program is configured to be executed by a processor to implement the above-mentioned wireless communication method.

[0016] According to one aspect of an embodiment of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions, and when the chip is running, is used to implement the above-mentioned wireless communication method.

[0017] According to one aspect of an embodiment of the present application, a computer program product is provided, which includes computer instructions stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the above-mentioned wireless communication method.

[0018] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0019] The terminal device receives the SSB sent by the network device within the first cycle. The first cycle is greater than or equal to 20ms. The SSB cycle is extended to the first cycle so that the terminal device can receive the SSB within the first cycle, avoiding cell search failure and improving communication efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

[0021] FIG2 is a schematic diagram of a ground area covered by a time-division beam lighting method provided by one embodiment of the present application;

[0022] FIG3 is a flow chart of a wireless communication method provided by one embodiment of the present application;

[0023] FIG4 is a schematic diagram of a first time window provided by an embodiment of the present application;

[0024] FIG5 is a schematic diagram of frame boundary offsets of different cell groups provided by one embodiment of the present application;

[0025] FIG6 is a schematic diagram of frame boundary alignment of different cell groups provided by one embodiment of the present application;

[0026] FIG7 is a schematic diagram of a candidate SSB pattern with SCS (Subcarrier Spacing) = 15 kHz provided by one embodiment of the present application;

[0027] FIG8 is a schematic diagram of candidate SSB patterns with SCS=30 kHz provided by one embodiment of the present application;

[0028] FIG9 is a schematic diagram of a candidate SSB pattern with SCS=30 kHz provided by another embodiment of the present application;

[0029] FIG10 is a schematic diagram of a cell SSB set with SCS=15kHz provided by one embodiment of the present application;

[0030] FIG11 is a block diagram of a wireless communication device provided by one embodiment of the present application;

[0031] FIG12 is a block diagram of a wireless communication device provided by another embodiment of the present application;

[0032] FIG13 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

[0033] FIG14 is a schematic diagram of the structure of a network device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0035] The network architecture and business scenarios described in the embodiments of the present application are intended 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. A person skilled in the art will appreciate that, with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0036] Please refer to FIG1 , which shows a schematic diagram of a network architecture 100 provided by an embodiment of the present application. The network architecture 100 may include: a terminal device 10 , an access network device 20 , and a core network element 30 .

[0037] The terminal device 10 may refer to a UE (User Equipment), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent, or a user apparatus. In some embodiments, the terminal device 10 may also be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5GS (5th Generation System) or a terminal device in a future evolved PLMN (Public Land Mobile Network), etc., and the embodiments of the present application are not limited thereto. For ease of description, the above-mentioned devices are collectively referred to as terminal devices. The number of terminal devices 10 is generally multiple, and one or more terminal devices 10 may be distributed in a cell managed by each access network device 20. The terminal device may also be referred to as a terminal or UE for short, and those skilled in the art will understand its meaning.

[0038] Access network equipment 20 is a device deployed in an access network to provide wireless communication capabilities for terminal devices 10. Access network equipment 20 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different wireless access technologies, the names of devices that provide access network equipment functions may vary. For example, in 5G NR systems, they are referred to as gNodeBs or gNBs. As communication technologies evolve, the term "access network equipment" may change. For ease of description, in the embodiments of this application, the aforementioned devices that provide wireless communication capabilities for terminal devices 10 are collectively referred to as access network equipment. In some embodiments, access network equipment 20 enables communication between terminal devices 10 and core network elements 30. For example, in an LTE (Long Term Evolution) system, access network equipment 20 may be an Evolved Universal Terrestrial Radio Access Network (EUTRAN) or one or more eNodeBs within the EUTRAN. In a 5G NR system, access network equipment 20 may be a Radio Access Network (RAN) or one or more gNBs within the RAN. In the embodiment of the present application, unless otherwise specified, the "network device" refers to the access network device 20, such as a base station.

[0039] The core network element 30 is a network element deployed in the core network. The main function of the core network element 30 is to provide user connectivity, user management, and service bearer. It also provides an interface to the external network as a bearer network. For example, the core network elements in the 5G NR system may include network elements such as the AMF (Access and Mobility Management Function) entity, the UPF (User Plane Function) entity, and the SMF (Session Management Function) entity.

[0040] In some embodiments, the access network device 20 and the core network element 30 communicate with each other via an air interface technology, such as the NG interface in the 5G NR system. The access network device 20 and the terminal device 10 communicate with each other via an air interface technology, such as the Uu interface.

[0041] The "5G NR system" in the embodiments of the present application may also be referred to as a 5G system or an NR system, but those skilled in the art will understand its meaning. The technical solutions described in the embodiments of the present application may be applicable to LTE systems, 5G NR systems, and subsequent evolution systems of 5G NR systems (e.g., B5G (Beyond 5G) systems, 6G systems (6th Generation System, sixth generation mobile communication systems)), and other communication systems such as NB-IoT (Narrow Band Internet of Things) systems, which are not limited in this application.

[0042] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources (for example, frequency domain resources, or spectrum resources) on the carrier used by the cell. The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0043] Before introducing the technical solutions of this application, we first introduce and explain some of the relevant technical knowledge involved in this application. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least part of the following contents.

[0044] 1. Cell search process of NR system

[0045] Cell search is the process by which a terminal device acquires time and frequency synchronization with a cell and detects the physical layer cell ID (identifier). The terminal device receives the Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) to perform cell search, assuming that the PBCH, PSS, and SSS are located in consecutive symbols to form a Synchronization Signal Block (SSB).

[0046] For a half-frame carrying an SSB, the first symbol index of the candidate SSB is determined based on the subcarrier spacing of the SSB, where index 0 corresponds to the first symbol of the first time slot in the half-frame, as follows:

[0047] - Pattern A - 15kHz SCS: The first symbol index of the candidate SSB is {2,8}+14·n.

[0048] For non-shared spectrum channel access: when the carrier frequency is less than or equal to 3 GHz, n = 0, 1; when the carrier frequency is greater than 3 GHz in FR1 (Frequency Range 1), n ​​= 0, 1, 2, 3;

[0049] -For shared spectrum channel access: n=0, 1, 2, 3, 4.

[0050] - Pattern B - 30 kHz SCS: The first symbol index of the candidate SSB is {4, 8, 16, 20} + 28·n. When the carrier frequency is less than or equal to 3 GHz, n = 0; when the carrier frequency is greater than 3 GHz in FR1, n = 0, 1.

[0051] - Pattern C - 30kHz SCS: The first symbol index of the candidate SSB is {2,8}+14·n.

[0052] - For non-shared spectrum channel access: For paired spectrum, when the carrier frequency is ≤3 GHz, n = 0, 1; when the carrier frequency in FR1 is greater than 3 GHz, n = 0, 1, 2, 3; for unpaired spectrum, when the carrier frequency is ≤1.88 GHz, n = 0, 1; when the carrier frequency in FR1 is greater than 1.88 GHz, n = 0, 1, 2, 3.

[0053] -For shared spectrum channel access: n=0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

[0054] - Pattern D-120 kHz: The first symbol index of the candidate SSB is {4, 8, 16, 20} + 28·n. For carrier frequencies in FR2, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.

[0055] - Pattern E-240 kHz: The first symbol index of the candidate SSB is {8, 12, 16, 20, 32, 36, 40, 44} + 28·n. For carrier frequencies within FR2-1, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0056] - Pattern F-480kHz: The first symbol index of the candidate SSB is {2,9}+14·n. For carrier frequencies within FR2-2, n = 0, 1, 2, ..., 29, 30, 31.

[0057] - Pattern G-960kHz: The first symbol index of the candidate SSB is {2,9}+14·n. For carrier frequencies within FR2-2, n = 0, 1, 2, ..., 29, 30, 31.

[0058] The candidate SSBs in a half frame are counted from 0 to Ascending index, where Determined according to SSB pattern AG. max The maximum value of the cell SSB index, that is, the maximum number of SSBs transmitted in half a frame is L max .

[0059] - For non-shared spectrum channel access in FR1 and FR2, and shared spectrum channel access in FR2-2,

[0060] - For shared spectrum channel access within FR1, and 15kHz SCS for SSB, and and 30kHz SCS SSB, L max =8.

[0061] for The terminal device determines the 2LSB (Least Significant Bit) bits of the candidate SSB index in the half frame based on a one-to-one mapping of the index of the DMRS (Demodulation Reference Signal) sequence transmitted by the PBCH.

[0062] for The terminal device determines the 3LSB bits of the candidate SSB index within the half frame based on a one-to-one mapping of the index of the DMRS sequence transmitted by the PBCH.

[0063] -for The terminal device uses the PBCH information bit Determine the 1MSB (Most Significant Bit) bit of the candidate SSB index;

[0064] -for The terminal device uses the PBCH information bit Determine the 2MSB bits of the candidate SSB index;

[0065] -for The terminal device uses the PBCH information bit Determine the 3MSB bits of the candidate SSB index.

[0066] The parameter ssb-periodicityServingCell provides a half-frame period in each serving cell for the terminal device to receive the SSB of the serving cell. If the terminal device is not configured for a half-frame period for receiving SSBs, a half-frame period is assumed. The terminal device assumes that all SSB periods in the serving cell are the same. For initial cell selection, the terminal device assumes a half-frame period of 2 frames for receiving SSBs.

[0067] The NR NTN system aims to cover ground elevation angles from 30 to 90 degrees for LEO (Low Earth Orbit) satellites, corresponding to a coverage area diameter exceeding 1,500 km. Since the LEO-600 satellite beam diameter is approximately 50 km, over 1,000 satellite beams are required to meet the coverage requirements for elevation angles from 30 to 90 degrees. Given the limited satellite transmit power and processing capabilities, igniting over 1,000 satellite beams simultaneously is unrealistic. Therefore, achieving system-level coverage expansion through an effective satellite beam scanning solution to meet satellite coverage requirements is a pressing issue.

[0068] Given that a satellite can only illuminate a limited number of beams at a time, it can only serve a portion of the ground area. Therefore, a time-division beam illumination method (also known as beam scanning or beam hopping) is required to cover the potential ground service range. As shown in Figure 2, taking some cells within the satellite's potential service area as an example, the satellite illuminates the satellite beams corresponding to cells #1 and #4 at time t0, and the satellite beams corresponding to cells #2 and #5 at time t1. This time-division beam illumination method achieves system-level coverage expansion and provides service to potential ground areas.

[0069] In the related art, for initial cell selection, the terminal device assumes that the SSB period is 20ms. Considering that the satellite beam corresponding to the terminal device may not get the opportunity to light up to send SSB within 20ms, the terminal device cell search fails.

[0070] The embodiment of the present application provides a wireless communication method that can extend the SSB period determined by a terminal device during initial cell selection, so that the terminal device can receive SSBs within the SSB period. Next, the technical solution provided by the embodiment of the present application will be described using the scenario shown in Figure 2 as an example.

[0071] Please refer to Figure 3, which shows a flow chart of a wireless communication method provided by an embodiment of the present application. The method can be applied to the network architecture shown in Figure 1. The method can include the following step 310.

[0072] Step 310: The terminal device receives the SSB sent by the network device within a first period, where the first period is greater than or equal to 20 milliseconds.

[0073] In some embodiments, the first period is related to a first frequency band, where the first frequency band is a frequency band in which the terminal device performs cell search.

[0074] In some embodiments, the terminal device determines the first period based on a frequency band in which the terminal device performs a cell search. Exemplarily, for initial cell selection, the terminal device determines the first period based on a frequency band in which the current cell search occurs.

[0075] In some embodiments, the terminal device determines the SSB SCS, SSB pattern, and SSB period on the synchronization grid of the frequency band based on the frequency band in which the terminal device currently performs cell search, to determine the first period, and then receive the SSB. The synchronization grid refers to all frequencies within the frequency band supported by the blind detection terminal device that can be used to send synchronization signals when the terminal device does not know the synchronization signal frequency.

[0076] Exemplarily, as shown in Table 1, the terminal device determines the first period according to the frequency band of the current cell search. For example, if the frequency band (first frequency band) of the current cell search is n256, the terminal device determines the first period to be 80ms.

[0077] In some embodiments, the first period is also related to the SCS of the first frequency band.

[0078] For example, as shown in Table 1, the frequency band (first frequency band) in which the current cell search is located is n255. If the SCS of the first frequency band is 15kHz, the terminal device determines the first period as 80ms. If the SCS of the first frequency band is 30kHz, the terminal device determines the first period as 40ms.

[0079] In some embodiments, if the terminal device does not receive SSB in the current frequency band, it can switch to another frequency band to receive SSB. For example, if the terminal device does not receive SSB on frequency band n256, the terminal device can switch to frequency band n255 to receive SSB.

[0080] In some embodiments, within the first period, if the terminal device does not receive SSB on the current frequency band, the terminal device switches to another frequency band and receives SSB within the first period determined based on the frequency band.

[0081] Table 1: Synchronous grid and SSB period for NTN band applications

[0082] In some embodiments, the network device sends the SSB to the cell where the terminal device is located.

[0083] In some embodiments, the network device sends the SSB to the cell where the terminal device is located based on the first period.

[0084] In some embodiments, the period for the network device to send SSB is a third period, and the third period is less than or equal to the first period.

[0085] In some embodiments, the network device determines the third period based on the first period.

[0086] In some embodiments, the network device determines the third period based on the second frequency band. The second frequency band is a frequency band in which the network device transmits SSB. For example, if the network device transmits SSB on frequency band n256, the network device determines that the third period is less than or equal to 80 ms.

[0087] In some embodiments, the network device determines the third period based on the second frequency band and the SCS of the second frequency band. For example, when the network device transmits SSB on frequency band n255, if the SCS of the second frequency band is 15 kHz, the network device determines that the third period is less than or equal to 80 ms; if the SCS of the second frequency band is 30 kHz, the network device determines that the third period is less than or equal to 40 ms.

[0088] In some embodiments, the network device is a satellite as shown in FIG. 2 .

[0089] In some embodiments, the network device sends SSBs to multiple cells simultaneously. For example, as shown in FIG2 , the network device sends SSBs to cell #1 and cell #4 at time t0, and sends SSBs to cell #2 and cell #5 at time t1.

[0090] In some embodiments, the network device completes SSB transmission to all cells covered by the network device in the first cycle. Taking the scenario shown in Figure 2 as an example, the network device completes SSB transmission to cells #0 to #5 in the first cycle.

[0091] In some embodiments, the network device completes SSB transmission to all cells covered by the network device within the third period. Taking the scenario shown in FIG2 as an example, the network device completes SSB transmission to cells #0 through #5 within the third period. The third period is less than or equal to the first period.

[0092] In some embodiments, the third period may be greater than 20ms, less than 20ms, or equal to 20ms, which is not limited in this application.

[0093] The technical solution provided by the embodiment of the present application is that the terminal device receives the SSB sent by the network device within the first period, the first period is greater than or equal to 20ms, and the SSB period is extended to the first period, so that the terminal device can receive the SSB within the first period, avoiding cell search failure and improving communication efficiency.

[0094] In addition, determining the first period based on the frequency band in which the cell search is located can ensure that the terminal device and the network device have the same understanding of the first period, ensuring that the terminal device can receive SSB within the first period.

[0095] In some embodiments, after receiving the SSB, the terminal device needs to further monitor the PDCCH (Physical Downlink Control Channel) to receive system messages.

[0096] In some embodiments, the method further includes the following step 320 (not shown in the figure).

[0097] Step 320: The terminal device monitors the PDCCH based on the second period.

[0098] In some embodiments, the terminal device monitors Type-0 PDCCH (Mode 0 PDCCH) based on a second period.

[0099] In some embodiments, for SSB and CORESET0 (Control Resource Set) multiplexing mode 1, the terminal device monitors the PDCCH in the Type-0 PDCCH common search space (CSS) on two time slots. For cell SSB#i, the terminal device determines the index of time slot n0 as And the frame SFN where time slot n0 is located C Satisfy: If SFN C mod2=0; if SFN C mod2 = 1, where μ is determined by the SCS of the PDCCH in the CORESET. O is used to determine the starting position of the PDCCH monitoring window corresponding to the first SSB, and M is used to determine the degree of overlap between the PDCCH monitoring windows corresponding to SSB#i and SSB#i+1. For example, M = 2 means no overlap, M = 1 means overlap by one time slot, and M = 1 / 2 means full overlap.

[0100] In some embodiments, for με{0,1,2,3} and SSB index i, the two time slots associated with the Type0-PDCCH monitoring opportunity are n0 and n0+1, and M, O and the first symbol index of CORESET in time slots n0 and n0+1 are indicated by the pdcch-ConfigSIB1 information field carried by PBCH from a preconfigured set of candidate values.

[0101] In some embodiments, for SSB and CORESET0 multiplexing mode 1, the listening period of Type-0 PDCCH is 20 ms. When the SSB period is extended from 20 ms to the first period, the listening period of Type-0 PDCCH can be extended to a second period, for example, the second period is 80 ms to match the lighting pattern of the satellite beam.

[0102] In some embodiments, the second period is determined based on the first period.

[0103] In some embodiments, the second period is the same as the first period. For example, if the first period is 80 ms, the terminal device determines the second period to be 80 ms.

[0104] In some embodiments, the first period is an integer multiple of the second period. For example, if the first period is 80 ms, the terminal device determines the second period to be 20 ms.

[0105] In some embodiments, the second period is indicated by SSB.

[0106] In some embodiments, the SSB may explicitly indicate the second period or may implicitly indicate the second period, which is not limited in this application.

[0107] In some embodiments, the SSB carries first information, and the first information is used to indicate a second cycle from a plurality of cycles.

[0108] In some embodiments, the first information may be information bits carried in an SSB.

[0109] In some embodiments, the first information may be carried by a PBCH. In some embodiments, the first information may be indicated by an information bit carried by a PBCH.

[0110] In some embodiments, the multiple periods are preconfigured candidate values. For example, the multiple periods are shown in Table 2.

[0111] Table 2: Type-0 PDCCH monitoring period candidate values ​​- SSB and CORESET multiplexing mode 1

[0112] Exemplarily, the first information is used to indicate that the index of the second period is 1, and the terminal device determines that the second period is 40ms based on the first information.

[0113] Exemplarily, the first information is used to indicate that the second period is 40 ms.

[0114] Through the above method, the period for the terminal device to monitor PDCCH is extended to a second period. The second period can be determined based on the first period or based on the first information carried by the SSB, thereby ensuring that the PDCCH monitoring period of the terminal device matches its corresponding satellite beam lighting period.

[0115] In some embodiments, the method further includes the following step 330 (not shown in the figure).

[0116] Step 330: The terminal device determines the first period according to the second period.

[0117] In some embodiments, when the second period is indicated by the SSB, the terminal device determines the first period based on the second period.

[0118] In some embodiments, when the second period is indicated by the first information carried in the SSB, the terminal device determines the first period based on the second period.

[0119] For example, multiple periods are shown in Table 2, and the first information is used to indicate the second period in the multiple periods shown in Table 2, so the first period can be determined based on the second period. In one example, the first period can be equal to the second period. For example, the terminal device determines the first period to be 60ms based on the second period. In another example, the first period can be an integer multiple of the second period. If the second period is 20ms, the terminal device determines the first period to be 80ms.

[0120] In some embodiments, after receiving the SSB, the terminal device executes step 330 to update the first cycle.

[0121] Exemplarily, before receiving the SSB, the terminal device determines the first period based on the first frequency band, and after receiving the SSB, the terminal device determines the first period based on the second period. For example, before receiving the SSB, the terminal device determines the first period to be 80ms based on the first frequency band, and after receiving the SSB, the terminal device determines the first period to be 60ms based on the second period.

[0122] In some embodiments, if the potential ground service range of the satellite is small, the network device may send SSB at a rate that is less than the SSB period associated with the frequency band in Table 1, such as 40ms. In this case, the terminal device receives SSB according to the SSB period associated with the frequency band in Table 1 before the second period is determined; after the second period is determined, the terminal device receives SSB according to the first period determined by the second period.

[0123] In some embodiments, the method further includes the following step 340 (not shown in the figure).

[0124] Step 340: The terminal device determines the time domain position for monitoring the PDCCH based on the time domain position of the SSB.

[0125] In some embodiments, the terminal device determines the time domain position of the SSB as the time domain position for monitoring the PDCCH.

[0126] In some embodiments, the terminal device determines the time domain position for monitoring the PDCCH based on the time domain position of the SSB and the offset value between the time domain position of the SSB and the time domain position of the PDCCH.

[0127] In some embodiments, the above offset value may be network configured, or may be predefined or configured, which is not limited in this application.

[0128] In some embodiments, if the offset value is predefined or preconfigured, the offset value is a default value, or a fixed value.

[0129] In some embodiments, if the above offset value is configured by the network, the above offset value can be indicated by SSB.

[0130] In some embodiments, the offset value may be carried on the information bits of the SSB. In some embodiments, the offset value may be carried on the information bits of the PBCH.

[0131] In some embodiments, the SSB is used to indicate an offset value among multiple offset values. For example, the multiple offset values ​​are shown in Table 3.

[0132] Table 3: PDCCH time domain position offset relative to the SSB time domain position (SSB and CORESET multiplexing mode 1)

[0133] Exemplarily, the index of the above-mentioned offset value indicated by SSB is 1, and the terminal device determines that the offset value of the time domain position of monitoring PDCCH compared to the time domain position where the SSB is located is 2.

[0134] In some embodiments, the plurality of offset values ​​are preconfigured or predefined.

[0135] In some embodiments, the terminal device determines the PDCCH frame index based on the SSB frame index. The SSB frame index refers to the index of the frame in which the SSB is located, and the PDCCH frame index refers to the index of the frame in which the PDCCH is located. In some embodiments, the time domain position of the SSB may also be used to determine the time slot index and symbol index corresponding to the PDCCH.

[0136] In some embodiments, the frame index is determined based on a time length of the second period.

[0137] In some embodiments, the frame index is determined with a period of 20 ms.

[0138] In some embodiments, for SSB and CORESET0 multiplexing mode 1, when the monitoring period of Type-0 PDCCH is extended to the second period, the terminal device SSB,i Determine the frame SFN where the corresponding Type-0 PDCCH monitoring opportunity is located C , such as SFN C =SFN SSB,i , or SFN C =SFN SSB,i +Offset SSB_PDCCH , where Offset SSB_PDCCH SFN C Compared with SFN SSB,i The frame offset value of the PBCH may be a default value or a value indicated by the information bit carried by the PBCH from a preconfigured candidate value set, as shown in Table 4.

[0139] Table 4: SFN C Compared with SFN SSB,i Frame offset value (SSB and CORESET multiplexing mode 1)

[0140] Through the above method, the terminal device determines the frame of its corresponding Type-0 PDCCH monitoring opportunity based on the frame of cell SSB#i, thereby ensuring that the terminal device can determine the PDCCH monitoring opportunity based on the received SSB.

[0141] Considering that the terminal device can only receive SSB when its corresponding satellite beam is lit, it is beneficial for the terminal device to save energy by further receiving SSB based on the first pattern after determining the first period.

[0142] In some embodiments, the above step 310 can be implemented as the following step 311 .

[0143] Step 311: During the first period, the terminal device receives the SSB sent by the network device based on the first pattern. The first pattern is at least one first time window within the first period. The first time window is the time window for the network device to send the SSB to the cell where the terminal device is located.

[0144] In some embodiments, the terminal device receives SSB within at least one first time window in the first pattern.

[0145] In some embodiments, the length of the first time window allows the transmission of L max SSB, L max The maximum value of the cell SSB index, that is, the maximum number of SSBs transmitted in half a frame is L max For example, the length of the first time window can be one or more half frames or frames, or multiple time slots or milliseconds. As shown in Figure 4, the length of the first time window is 3ms. If the cell adopts the SSB structure of pattern A, the transmission L max =4 SSBs require 2 time slots, so the first time window with a length of 3ms can meet the SSB transmission requirements.

[0146] In some embodiments, any one of the number, period, and duration of the first time windows within the first period is specified by a protocol or indicated by a network device.

[0147] Exemplarily, any one of the number, period, and duration of the first time windows within the first period is indicated by a system message and / or a handover command.

[0148] For the time position of the first time window of different satellite beams or cells within the first cycle, the following design is available:

[0149] For ease of explanation, the cells corresponding to satellite beams lit at the same time are defined as a cell group, and the cells corresponding to satellite beams lit at different times belong to different cell groups. Assuming that there are N cell groups in the potential ground service area of ​​the satellite, namely {cell group #0, cell group #1, ..., cell group #N-1}, the first time windows of different cell groups are designed as follows:

[0150] In some embodiments, the network device sends SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are offset by at least one first time window.

[0151] In some embodiments, the time domain unit index corresponding to the time window in which the network device sends SSB to different cell groups is the same.

[0152] For example, as shown in Figure 5, the frame boundaries corresponding to cell group #1 and cell group #2 are offset by the length of the first time window, and the frame boundaries corresponding to cell group #2 and cell group #3 are offset by the length of the first time window. At this time, the time slot indexes corresponding to the first time windows of the three cell groups are all time slot #0-time slot #2. It should be noted that the frame indexes corresponding to the first time windows of the three cell groups can be the same or different, and this application does not limit this.

[0153] In some embodiments, the time domain unit index may be a time slot index or a frame index, which is not limited in this application.

[0154] In some embodiments, the network device sends SSB to different cell groups at different time domain locations, and the frame boundaries of different cell groups are aligned.

[0155] In some embodiments, the time domain unit index corresponding to the time window in which the network device sends SSB to different cell groups is different.

[0156] For example, as shown in FIG6 , the frame boundaries of cell group #1, cell group #2, and cell group #3 are aligned. In this case, the time slot indices corresponding to the first time windows of cell group #1, cell group #2, and cell group #3 are time slot #0-time slot #2, time slot #3-time slot #5, and time slot #6-time slot #8, respectively. It should be noted that the frame indices corresponding to the first time windows of the three cell groups may be the same or different, and this application does not limit this.

[0157] Through the above method, the frame boundaries of different cell groups are offset by one or more first time windows, or the first time windows of different cell groups correspond to different time domain unit indices. This enables the satellite beams corresponding to different cell groups to be illuminated in a time-division manner, effectively improving satellite coverage under conditions of limited satellite power and processing capabilities.

[0158] Considering that the SSB in the related art is always sent from the first time slot in the half frame, and the SSB in the first time window may be sent in any time slot. In some embodiments, the terminal device receives the SSB in the first time window for cell synchronization, and the SSB is a candidate SSB in the candidate SSB set.

[0159] In some embodiments, the SSB is a candidate SSB in a candidate SSB set, the candidate SSB set includes at least one candidate SSB, and the at least one candidate SSB is distributed according to a candidate SSB pattern.

[0160] In some embodiments, the candidate SSB set includes at least 5 candidate SSBs, and the candidate SSBs are distributed in each time unit in the half frame according to the candidate SSB pattern and indexed in ascending order according to time, where the time unit is a time slot or millisecond.

[0161] In some embodiments, for SCS=15kHz, each time slot in a half-frame contains two candidate SSBs. Taking the candidate SSB pattern shown in FIG7 as an example, the first symbol index of the candidate SSB is {2, 8}+14·n, where n=0, 1, 2, 3, 4.

[0162] In some embodiments, for SCS = 30 kHz, every two time slots in a half-frame contain two candidate SSBs. For example, each time slot in a half-frame contains one candidate SSB. Taking the candidate SSB pattern shown in FIG8 as an example, the first symbol index of the candidate SSB is {4, 16} + 28·n, where n = 0, 1, 2, 3, 4.

[0163] In some embodiments, for SCS=30kHz, every other time slot in a half-frame contains two candidate SSBs. Taking the candidate SSB pattern shown in FIG9 as an example, the first symbol index of the candidate SSB is {4, 8}+28·n, where n=0, 1, 2, 3, 4.

[0164] In some embodiments, the method further includes at least one of the following steps 350 to 360 (not shown in the figure).

[0165] Step 350: Determine a second time window based on the first time window, where the second time window is a time window for the network device to send the SSB to the neighboring cell of the terminal device.

[0166] In some embodiments, the second time window may also be referred to as the first time window of the neighboring cell, or the first time window of the neighboring area, which is not limited in this application.

[0167] Step 360: Receive the SSB of the neighboring cell based on the second time window within the first period.

[0168] In some embodiments, the terminal device may perform neighboring cell measurement based on the time position of the first time window of the neighboring cell (i.e., the second time window) within the first period. For example, if the frame boundaries of different cell groups are offset by one or more first time windows, the terminal device may determine the first time window of the neighboring cell based on the number of first time windows offset between the serving cell and the neighboring cell frame boundary, thereby receiving the SSB within the first time window of the neighboring cell for neighboring cell measurement; for another example, if the time slot indexes corresponding to the first time windows of different cell groups are different, the terminal device may determine the first time window of the neighboring cell based on the time slot index corresponding to the first time window of the neighboring cell, thereby receiving the SSB within the first time window of the neighboring cell for neighboring cell measurement.

[0169] In some embodiments, the method further includes the following step 370 (not shown in the figure).

[0170] In step 370, the terminal device determines the time domain unit where the SSB is located based on the candidate SSB pattern and the index of the candidate SSB corresponding to the SSB.

[0171] In some embodiments, the time domain unit where the SSB is located includes the time slot and symbol where the SSB is located.

[0172] To perform cell synchronization, the terminal device needs to determine the time slot and symbol of the received SSB. In some embodiments, the terminal device determines the time slot and symbol of the received SSB based on the candidate SSB pattern and the candidate SSB index corresponding to the received SSB.

[0173] In some embodiments, the index of the candidate SSB corresponding to the SSB is determined based on the second information and / or the index of the DMRS sequence carried in the SSB, and the second information is the information bit of the PBCH. For example, the terminal device determines the 3LSB bits of the candidate SSB index based on a one-to-one mapping of the index of the DMRS sequence transmitted by the PBCH, and the 3LSB bits of the candidate SSB index based on the PBCH information bit. Determine the 1MSB bit of the candidate SSB index.

[0174] The cell SSB index is the SSB index corresponding to the SSB set sent by the cell. The terminal device determines the cell SSB set and performs PDCCH monitoring based on the cell SSB index. For the NTN frequency band, the maximum number of SSBs transmitted by the cell in half a frame is L. max =4, occupying four consecutive candidate SSBs in the candidate SSB set. Taking the cell SSB set shown in Figure 10 as an example, the candidate SSBs are evenly distributed in each time slot within the half-frame, and the cell SSB is transmitted starting from time slot #3, corresponding to candidate SSBs #6-9 in time slots #3-4. That is, the first symbol index of the cell SSB is {2, 8} + 14·n, where n = 3 and 4, respectively.

[0175] In some embodiments, the SSB carries third information, and the third information is used to indicate the cell SSB index corresponding to the SSB, where the cell SSB index is the index of the SSB in the cell SSB set.

[0176] For example, if the cell SSB is specified to start from the time slot boundary corresponding to SCS=15kHz, then according to the candidate SSB pattern, the network device further indicates that the current SSB is the first 2 SSBs or the last 2 SSBs in the cell SSB set, and the terminal device can determine the cell SSB index corresponding to the current SSB. Determine the cell SSB index corresponding to the received SSB, for example, the terminal device determines the cell SSB index corresponding to the received SSB according to the PBCH information bit. Determine whether the received SSB is the first two SSBs or the last two SSBs in the cell SSB set, thereby determining the cell SSB index corresponding to the SSB.

[0177] In some embodiments, the terminal device determines the cell SSB index corresponding to the SSB based on the candidate SSB pattern and the third information. Exemplarily, the terminal device determines the candidate SSB index of the SSB based on the third information, and then determines the cell SSB index corresponding to the SSB based on the candidate SSB index and the candidate SSB pattern.

[0178] In some embodiments, the third information may be the same information as the second information or different information from the second information, which is not limited in this application. In some embodiments, if the third information is the same information as the second information, the third information is the second information.

[0179] Through the above method, the terminal device receives the SSB in the first time window, and the SSB is a candidate SSB in the candidate SSB set, and the candidate SSB is distributed in each time unit in the half frame according to the candidate SSB pattern. This enables the network device to send the cell SSB from any time slot.

[0180] The terminal device determines the candidate SSB index and cell SSB index based on the DMRS sequence and / or information bits carried by the PBCH, thereby ensuring that the terminal device can synchronize the cell, determine the cell SSB set, and monitor the PDCCH based on the received SSB.

[0181] The following are device embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0182] Please refer to Figure 11, which shows a block diagram of a wireless communication device provided by one embodiment of the present application. The device has the function of implementing the wireless communication method on the terminal device side described above. The function can be implemented by hardware or by hardware executing corresponding software. The device can be the terminal device described above, or it can be set in a terminal device. As shown in Figure 11, the device 1100 may include: a receiving module 1110.

[0183] The receiving module 1110 is used to receive the synchronization signal block SSB sent by the network device within a first period, and the first period is greater than or equal to 20 milliseconds.

[0184] In some embodiments, the first period is related to a first frequency band, where the first frequency band is a frequency band in which the terminal device performs cell search.

[0185] In some embodiments, the first period is also related to the subcarrier spacing SCS of the first frequency band.

[0186] In some embodiments, the receiving module 1110 is further configured to monitor a physical downlink control channel (PDCCH) based on a second period.

[0187] In some embodiments, the second period is determined based on the first period.

[0188] In some embodiments, the second period is the same as the first period, or the first period is an integer multiple of the second period.

[0189] In some embodiments, the second period is indicated by the SSB.

[0190] In some embodiments, the SSB carries first information, and the first information is used to indicate the second period from multiple periods.

[0191] In some embodiments, the apparatus 1100 further includes a processing module (not shown).

[0192] A processing module is configured to determine the first period according to the second period.

[0193] In some embodiments, the processing module is used to determine the time domain position for monitoring the PDCCH based on the time domain position of the SSB.

[0194] In some embodiments, the receiving module 1110 is used to receive the SSB sent by the network device based on a first pattern within the first period, where the first pattern is at least one first time window within the first period, and the first time window is the time window for the network device to send the SSB to the cell where the terminal device is located.

[0195] In some embodiments, any one of the number, period and duration of the first time windows in the first period is specified by a protocol or indicated by the network device.

[0196] In some embodiments, the network device sends the SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are offset by at least one of the first time windows.

[0197] In some embodiments, the time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is the same.

[0198] In some embodiments, the network device sends the SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are aligned.

[0199] In some embodiments, the time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is different.

[0200] In some embodiments, the processing module is configured to determine a second time window based on the first time window, where the second time window is a time window for the network device to send the SSB to a neighboring cell of the terminal device;

[0201] The receiving module 1110 is further configured to receive the SSB of the neighboring cell based on the second time window within the first cycle.

[0202] In some embodiments, the SSB is a candidate SSB in a candidate SSB set, the candidate SSB set includes at least one candidate SSB, and the at least one candidate SSB is distributed according to a candidate SSB pattern.

[0203] In some embodiments, the processing module is used to determine the time domain unit where the SSB is located based on the candidate SSB pattern and the index of the candidate SSB corresponding to the SSB.

[0204] In some embodiments, the index of the candidate SSB corresponding to the SSB is determined based on the index of the second information and / or the demodulation reference signal DMRS sequence carried in the SSB, where the second information is the information bit of the physical broadcast channel PBCH.

[0205] In some embodiments, the SSB carries third information, and the third information is used to indicate the cell SSB index corresponding to the SSB, and the cell SSB index is the index of the SSB in the cell SSB set.

[0206] The technical solution provided by the embodiment of the present application is that the terminal device receives the SSB sent by the network device within the first period, the first period is greater than or equal to 20ms, and the SSB period is extended to the first period, so that the terminal device can receive the SSB within the first period, avoiding cell search failure and improving communication efficiency.

[0207] Please refer to Figure 12, which shows a block diagram of a wireless communication device provided by one embodiment of the present application. The device has the function of implementing the wireless communication method on the network device side described above. The function can be implemented by hardware or by hardware executing corresponding software. The device can be the network device described above, or it can be set in the network device. As shown in Figure 12, the device 1200 can include: a sending module 1210.

[0208] The sending module 1210 is used to send a synchronization signal block SSB to the cell where the terminal device is located based on a first period, and the first period is greater than or equal to 20 milliseconds.

[0209] In some embodiments, the first period is related to a first frequency band, where the first frequency band is a frequency band in which the terminal device performs cell search.

[0210] In some embodiments, the first period is also related to the subcarrier spacing SCS of the first frequency band.

[0211] In some embodiments, the sending module 1210 is further used to send a physical downlink control channel PDCCH to the terminal device based on a second period.

[0212] In some embodiments, the second period is determined based on the first period.

[0213] In some embodiments, the second period is the same as the first period, or the first period is an integer multiple of the second period.

[0214] In some embodiments, the second period is indicated by the SSB.

[0215] In some embodiments, the SSB carries first information, and the first information is used to indicate the second period from multiple periods.

[0216] In some embodiments, the second period is used to determine the first period.

[0217] In some embodiments, the time domain position of the PDCCH is determined based on the time domain position of the SSB.

[0218] In some embodiments, the sending module 1210 is used to send the SSB to the terminal device based on a first pattern within the first period, where the first pattern is at least one first time window within the first period, and the first time window is the time window for the network device to send the SSB to the cell where the terminal device is located.

[0219] In some embodiments, any one of the number, period and duration of the first time windows in the first period is specified by a protocol or indicated by the network device.

[0220] In some embodiments, the network device sends the SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are offset by at least one of the first time windows.

[0221] In some embodiments, the time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is the same.

[0222] In some embodiments, the network device sends the SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are aligned.

[0223] In some embodiments, the time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is different.

[0224] In some embodiments, the sending module 1210 is further used to send the SSB to the neighboring cell of the terminal device based on a second time window within the second period, and the second time window is the time window for the network device to send the SSB to the neighboring cell.

[0225] In some embodiments, the SSB is a candidate SSB in a candidate SSB set, the candidate SSB set includes at least one candidate SSB, and the at least one candidate SSB is distributed according to a candidate SSB pattern.

[0226] In some embodiments, the time domain unit where the SSB is located is determined based on the candidate SSB pattern and the index of the candidate SSB corresponding to the SSB.

[0227] In some embodiments, the index of the candidate SSB corresponding to the SSB is determined based on the index of the second information and / or the demodulation reference signal DMRS sequence carried in the SSB, where the second information is the information bit of the physical broadcast channel PBCH.

[0228] In some embodiments, the SSB carries third information, and the third information is used to indicate the cell SSB index corresponding to the SSB, and the cell SSB index is the index of the SSB in the cell SSB set.

[0229] According to the technical solution provided by the embodiment of the present application, the network device sends the SSB based on the first period, the period for the network device to send the SSB is less than or equal to the first period, and the terminal device receives the SSB sent by the network device within the first period, so that the terminal device can receive the SSB within the first period, thereby avoiding cell search failure and improving communication efficiency.

[0230] It should be noted that, when the device provided in the above embodiment realizes its function, it only uses the division of the above-mentioned functional modules as an example. In actual application, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0231] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here. For details not described in detail in the embodiment of the device, reference can be made to the above method embodiment.

[0232] Please refer to Figure 13, which shows a schematic diagram of the structure of a terminal device provided by one embodiment of the present application. The terminal device 1300 may include: a processor 1301, a transceiver 1302, and a memory 1303. The transceiver 1302 is used to implement a transmission or reception function, such as the function of the aforementioned receiving module 1110, and the processor 1301 may be used to implement other processing functions or control transmission and / or reception, such as the function of the aforementioned processing module.

[0233] The processor 1301 includes one or more processing cores. The processor 1301 executes various functional applications and information processing by running software programs and modules.

[0234] The transceiver 1302 may include a receiver and a transmitter. For example, the receiver and the transmitter may be implemented as the same wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0235] The memory 1303 may be connected to the processor 1301 and the transceiver 1302 .

[0236] The memory 1303 may be used to store a computer program executed by the processor, and the processor 1301 is used to execute the computer program to implement each step in the above method embodiment.

[0237] In some embodiments, the transceiver 1302 is configured to receive a synchronization signal block SSB sent by a network device within a first period, where the first period is greater than or equal to 20 milliseconds.

[0238] For details not described in detail in this embodiment, please refer to the above embodiments and will not be described in detail here.

[0239] In addition, the memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, static access memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0240] Please refer to Figure 14, which shows a schematic diagram of the structure of a network device 1400 provided in one embodiment of the present application. Network device 1400 can be used to execute the method steps performed by the network device in the above embodiments. Network device 1400 may include: a processor 1401, a transceiver 1402, and a memory 1403. The transceiver 1402 is used to implement sending or receiving functions, such as the functions of the sending module 1210 described above, and the processor 1401 can be used to implement other processing functions or control sending and / or receiving.

[0241] The processor 1401 includes one or more processing cores. The processor 1401 executes various functional applications and information processing by running software programs and modules.

[0242] The transceiver 1402 may include a receiver and a transmitter. For example, the transceiver 1402 may include a wired communication component, which may include a wired communication chip and a wired interface (such as an optical fiber interface). Alternatively, the transceiver 1402 may also include a wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0243] The memory 1403 may be connected to the processor 1401 and the transceiver 1402 .

[0244] The memory 1403 may be used to store a computer program executed by the processor, and the processor 1401 is used to execute the computer program to implement each step performed by the network device in the above method embodiment.

[0245] In addition, the memory 1403 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic disk or optical disk, electrically erasable programmable read-only memory, erasable programmable read-only memory, static access memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0246] In some embodiments, the transceiver 1402 is used to send a synchronization signal block SSB to the cell where the terminal device is located based on a first period, and the first period is greater than or equal to 20 milliseconds.

[0247] For details not described in detail in this embodiment, please refer to the above embodiments and will not be described in detail here.

[0248] The embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored, and the computer program is used to be executed by a processor to implement the wireless communication method on the terminal device side or the wireless communication method on the network device side. In some embodiments, the computer-readable storage medium may include: ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives) or optical disks, etc. Among them, random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).

[0249] An embodiment of the present application also provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip is running, it is used to implement the above-mentioned wireless communication method on the terminal device side, or to implement the above-mentioned wireless communication method on the network device side.

[0250] An embodiment of the present application also provides a computer program product, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor reads and executes the computer instructions from the computer-readable storage medium to implement the above-mentioned wireless communication method on the terminal device side, or to implement the above-mentioned wireless communication method on the network device side.

[0251] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0252] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0253] In some embodiments of the present application, "predefined" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., including a terminal device and a network device), and the present application does not limit the specific implementation method. For example, predefined may refer to information defined in a protocol.

[0254] In some embodiments of the present application, the "protocol" may refer to a standard protocol in the field of communications, for example, it may include an LTE protocol, a NR protocol, and related protocols used in future communication systems, and this application does not limit this.

[0255] In this document, "plurality" refers to two or more. "And / or" describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates an "or" relationship between the associated objects.

[0256] The term “greater than or equal to” mentioned herein may mean greater than or equal to, or greater than, and the term “less than or equal to” may mean less than or equal to, or less than.

[0257] In addition, the step numbers described in this document only illustrate a possible execution order between the steps. In some other embodiments, the above steps may not be executed in the order of the numbers, such as two steps with different numbers are executed at the same time, or two steps with different numbers are executed in the opposite order of the diagram. The embodiments of the present application are not limited to this.

[0258] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0259] The above description is merely an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A wireless communication method, characterized in that: The method is performed by a terminal device, and the method includes: A synchronization signal block SSB sent by a network device is received within a first period, where the first period is greater than or equal to 20 milliseconds.

2. The method according to claim 1, characterized in that The first period is related to a first frequency band, and the first frequency band is a frequency band in which the terminal device performs a cell search.

3. The method according to claim 2, characterized in that The first period is also related to the subcarrier spacing SCS of the first frequency band.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: A physical downlink control channel PDCCH is monitored based on a second period.

5. The method according to claim 4, characterized in that The second period is determined according to the first period.

6. The method according to claim 5, characterized in that The second period is the same as the first period, or the first period is an integer multiple of the second period.

7. The method according to claim 4, characterized in that The second period is indicated by the SSB.

8. The method according to claim 7, characterized in that The SSB carries first information, and the first information is used to indicate the second period from multiple periods.

9. The method according to claim 7 or 8, characterized in that: The method further comprises: The first period is determined according to the second period.

10. The method according to any one of claims 4 to 9, characterized in that: The method further comprises: According to the time domain position of the SSB, the time domain position for monitoring the PDCCH is determined.

11. The method according to any one of claims 1 to 10, characterized in that: The receiving of the SSB sent by the network device in the first cycle includes: In the first cycle, the SSB sent by the network device is received based on a first pattern, where the first pattern is at least one first time window in the first cycle, and the first time window is a time window for the network device to send the SSB to the cell where the terminal device is located.

12. The method according to claim 11, characterized in that Any one of the number, period and duration of the first time windows in the first period is specified by a protocol or indicated by the network device.

13. The method according to claim 11 or 12, characterized in that: The network device sends the SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are offset by at least one of the first time windows.

14. The method according to claim 13, characterized in that The time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is the same.

15. The method according to claim 11 or 12, characterized in that: The network device sends the SSB to different cell groups at different time domain positions, and the frame boundaries of the different cell groups are aligned.

16. The method according to claim 15, characterized in that The time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is different.

17. The method according to any one of claims 11 to 16, characterized in that: The method further comprises: Determine a second time window according to the first time window, where the second time window is a time window for the network device to send the SSB to a neighboring cell of the terminal device; During the first cycle, the SSB of the neighboring cell is received based on the second time window.

18. The method according to any one of claims 1 to 17, characterized in that The SSB is a candidate SSB in a candidate SSB set, the candidate SSB set includes at least one candidate SSB, and the at least one candidate SSB is distributed according to a candidate SSB pattern.

19. The method according to claim 18, characterized in that The method further comprises: According to the candidate SSB pattern and the index of the candidate SSB corresponding to the SSB, the time domain unit where the SSB is located is determined.

20. The method according to claim 19, characterized in that The index of the candidate SSB corresponding to the SSB is determined based on the index of the second information and / or the demodulation reference signal DMRS sequence carried in the SSB, where the second information is the information bit of the physical broadcast channel PBCH.

21. The method according to any one of claims 18 to 20, characterized in that The SSB carries third information, and the third information is used to indicate the cell SSB index corresponding to the SSB, and the cell SSB index is the index of the SSB in the cell SSB set.

22. A wireless communication method, characterized in that: The method is performed by a network device, and the method includes: A synchronization signal block SSB is sent to the cell where the terminal device is located based on a first period, and the first period is greater than or equal to 20 milliseconds.

23. The method according to claim 22, characterized in that The first period is related to a first frequency band, and the first frequency band is a frequency band in which the terminal device performs a cell search.

24. The method according to claim 23, characterized in that The first period is also related to the subcarrier spacing SCS of the first frequency band.

25. The method according to any one of claims 22 to 24, characterized in that The method further comprises: A physical downlink control channel PDCCH is sent to the terminal device based on the second period.

26. The method according to claim 25, characterized in that The second period is determined according to the first period.

27. The method according to claim 26, characterized in that The second period is the same as the first period, or the first period is an integer multiple of the second period.

28. The method according to claim 25, characterized in that The second period is indicated by the SSB.

29. The method according to claim 28, characterized in that The SSB carries first information, and the first information is used to indicate the second period from multiple periods.

30. The method according to claim 28 or 29, characterized in that The second period is used to determine the first period.

31. The method according to any one of claims 25 to 30, characterized in that The time domain position of the PDCCH is determined according to the time domain position of the SSB.

32. The method according to any one of claims 22 to 31, characterized in that The sending the SSB to the cell where the terminal device is located based on the first period includes: In the first cycle, the SSB is sent to the terminal device based on a first pattern, where the first pattern is at least one first time window in the first cycle, and the first time window is a time window in which the network device sends the SSB to the cell where the terminal device is located.

33. The method according to claim 32, characterized in that Any one of the number, period and duration of the first time windows in the first period is specified by a protocol or indicated by the network device.

34. The method according to claim 32 or 33, characterized in that The network device sends the SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are offset by at least one of the first time windows.

35. The method according to claim 34, characterized in that The time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is the same.

36. The method according to claim 32 or 33, characterized in that The network device sends the SSB to different cell groups at different time domain positions, and the frame boundaries of the different cell groups are aligned.

37. The method according to claim 36, characterized in that The time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is different.

38. The method according to any one of claims 32 to 37, characterized in that The method further comprises: In the second cycle, the SSB is sent to the neighboring cell of the terminal device based on a second time window, and the second time window is the time window for the network device to send the SSB to the neighboring cell.

39. The method according to any one of claims 22 to 38, characterized in that The SSB is a candidate SSB in a candidate SSB set, the candidate SSB set includes at least one candidate SSB, and the at least one candidate SSB is distributed according to a candidate SSB pattern.

40. The method according to claim 39, characterized in that The time domain unit where the SSB is located is determined based on the candidate SSB pattern and the index of the candidate SSB corresponding to the SSB.

41. The method according to claim 40, characterized in that The index of the candidate SSB corresponding to the SSB is determined based on the index of the second information and / or the demodulation reference signal DMRS sequence carried in the SSB, where the second information is the information bit of the physical broadcast channel PBCH.

42. The method according to any one of claims 39 to 41, characterized in that The SSB carries third information, and the third information is used to indicate the cell SSB index corresponding to the SSB, and the cell SSB index is the index of the SSB in the cell SSB set.

43. A wireless communication device, characterized in that: The device comprises: The receiving module is used to receive a synchronization signal block SSB sent by a network device within a first period, and the first period is greater than or equal to 20 milliseconds.

44. The device according to claim 43, characterized in that The first period is related to a first frequency band, and the first frequency band is a frequency band in which the terminal device performs a cell search.

45. The device according to claim 44, characterized in that The first period is also related to the subcarrier spacing SCS of the first frequency band.

46. ​​The device according to any one of claims 43 to 45, characterized in that The receiving module is further configured to monitor a physical downlink control channel PDCCH based on a second period.

47. The device according to claim 46, characterized in that The second period is determined according to the first period.

48. The device according to claim 47, characterized in that The second period is the same as the first period, or the first period is an integer multiple of the second period.

49. The device according to claim 46, characterized in that The second period is indicated by the SSB.

50. The device according to claim 49, characterized in that The SSB carries first information, and the first information is used to indicate the second period from multiple periods.

51. The device according to claim 49 or 50, characterized in that The device also includes: A processing module is used to determine the first period according to the second period.

52. The device according to any one of claims 46 to 51, characterized in that The device also includes: A processing module is used to determine the time domain position for monitoring the PDCCH according to the time domain position of the SSB.

53. The device according to any one of claims 43 to 52, characterized in that The receiving module is used to receive the SSB sent by the network device based on a first pattern within the first period, wherein the first pattern is at least one first time window within the first period, and the first time window is the time window for the network device to send the SSB to the cell where the terminal device is located.

54. The device according to claim 53, characterized in that Any one of the number, period and duration of the first time windows in the first period is specified by a protocol or indicated by the network device.

55. The device according to claim 53 or 54, characterized in that The network device sends the SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are offset by at least one of the first time windows.

56. The device according to claim 55, characterized in that The time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is the same.

57. The device according to claim 53 or 54, characterized in that The network device sends the SSB to different cell groups at different time domain positions, and the frame boundaries of the different cell groups are aligned.

58. The device according to claim 57, characterized in that The time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is different.

59. The device according to any one of claims 53 to 58, characterized in that The device also includes: A processing module, configured to determine a second time window according to the first time window, where the second time window is a time window for the network device to send the SSB to a neighboring cell of the terminal device; The receiving module is also used to receive the SSB of the neighboring cell based on the second time window within the first cycle.

60. The device according to any one of claims 43 to 59, characterized in that The SSB is a candidate SSB in a candidate SSB set, the candidate SSB set includes at least one candidate SSB, and the at least one candidate SSB is distributed according to a candidate SSB pattern.

61. The device according to claim 60, characterized in that The device also includes: A processing module is used to determine the time domain unit where the SSB is located based on the candidate SSB pattern and the index of the candidate SSB corresponding to the SSB.

62. The device according to claim 61, characterized in that The index of the candidate SSB corresponding to the SSB is determined based on the index of the second information and / or the demodulation reference signal DMRS sequence carried in the SSB, where the second information is the information bit of the physical broadcast channel PBCH.

63. The device according to any one of claims 60 to 62, characterized in that The SSB carries third information, and the third information is used to indicate the cell SSB index corresponding to the SSB, and the cell SSB index is the index of the SSB in the cell SSB set.

64. A wireless communication device, characterized in that: The device comprises: The sending module is used to send a synchronization signal block SSB to the cell where the terminal device is located based on a first period, and the first period is greater than or equal to 20 milliseconds.

65. The device according to claim 64, characterized in that The first period is related to a first frequency band, and the first frequency band is a frequency band in which the terminal device performs a cell search.

66. The device according to claim 65, characterized in that The first period is also related to the subcarrier spacing SCS of the first frequency band.

67. The device according to any one of claims 64 to 66, characterized in that The sending module is also used to send a physical downlink control channel PDCCH to the terminal device based on a second period.

68. The device according to claim 67, characterized in that The second period is determined according to the first period.

69. The device according to claim 68, characterized in that The second period is the same as the first period, or the first period is an integer multiple of the second period.

70. The device according to claim 67, characterized in that The second period is indicated by the SSB.

71. The device according to claim 70, characterized in that The SSB carries first information, and the first information is used to indicate the second period from multiple periods.

72. The device according to claim 70 or 71, characterized in that The second period is used to determine the first period.

73. The device according to any one of claims 67 to 72, characterized in that The time domain position of the PDCCH is determined according to the time domain position of the SSB.

74. The device according to any one of claims 64 to 73, characterized in that The sending module is used to send the SSB to the terminal device based on a first pattern within the first cycle, where the first pattern is at least one first time window within the first cycle, and the first time window is the time window for the network device to send the SSB to the cell where the terminal device is located.

75. The device according to claim 74, characterized in that Any one of the number, period and duration of the first time windows in the first period is specified by a protocol or indicated by the network device.

76. The device according to claim 74 or 75, characterized in that The network device sends the SSB to different cell groups at different time domain locations, and the frame boundaries of the different cell groups are offset by at least one of the first time windows.

77. The device according to claim 76, characterized in that The time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is the same.

78. The device according to claim 74 or 75, characterized in that The network device sends the SSB to different cell groups at different time domain positions, and the frame boundaries of the different cell groups are aligned.

79. The device according to claim 78, characterized in that The time domain unit index corresponding to the time window in which the network device sends the SSB to the different cell groups is different.

80. The device according to any one of claims 74 to 79, characterized in that The sending module is also used to send the SSB to the neighboring cell of the terminal device based on a second time window within the second period, and the second time window is the time window for the network device to send the SSB to the neighboring cell.

81. The device according to any one of claims 64 to 80, characterized in that The SSB is a candidate SSB in a candidate SSB set, the candidate SSB set includes at least one candidate SSB, and the at least one candidate SSB is distributed according to a candidate SSB pattern.

82. The device according to claim 81, characterized in that The time domain unit where the SSB is located is determined based on the candidate SSB pattern and the index of the candidate SSB corresponding to the SSB.

83. The device according to claim 82, characterized in that The index of the candidate SSB corresponding to the SSB is determined based on the index of the second information and / or the demodulation reference signal DMRS sequence carried in the SSB, where the second information is the information bit of the physical broadcast channel PBCH.

84. The device according to any one of claims 81 to 83, characterized in that The SSB carries third information, and the third information is used to indicate the cell SSB index corresponding to the SSB, and the cell SSB index is the index of the SSB in the cell SSB set.

85. A communication device, characterized in that: The communication device comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the method according to any one of claims 1 to 21, or implements the method according to any one of claims 22 to 42.

86. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is used to be executed by a processor to implement the method according to any one of claims 1 to 21, or to implement the method according to any one of claims 22 to 42.

87. A chip, characterized in that: The chip includes a programmable logic circuit and / or program instructions, and when the chip is running, it is used to implement the method according to any one of claims 1 to 21, or to implement the method according to any one of claims 22 to 42.

88. A computer program product, characterized in that The computer program product includes computer instructions, which are stored in a computer-readable storage medium. The processor reads and executes the computer instructions from the computer-readable storage medium to implement the method according to any one of claims 1 to 21, or to implement the method according to any one of claims 22 to 42.

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