Beam indication method, device, apparatus and storage medium

Abstract

Provided in the present disclosure are a beam indication method, a device, an apparatus and a storage medium. The method comprises: on the basis of a broadcast message received on a first beam, determining a target beam corresponding to the terminal, the broadcast message comprising angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam; and indicating related information of the target beam to an on-board network device, wherein the target beam is a second beam used by the on-board network device for serving the terminal.

Description

Beam indication method, device, apparatus and storage medium

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese Patent Application No. 202411385633.9, filed on September 30, 2024, and entitled “Beam indication method, device, apparatus and storage medium”, which is incorporated by reference herein in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of communication, and particularly relates to a beam indication method, device, apparatus and storage medium. BACKGROUND

[0004] Due to the great coverage of satellites and the limited resources on the satellite, it is difficult to maintain real-time global coverage. To solve the above problem, in the non-terrestrial network (Non-Terrestrial Networks, NTN) scenario, a hopping beam method can be used to utilize limited physical beams to serve different wave positions in time, thereby realizing global coverage in the service area.

[0005] In related technologies, the widths of all beams are equal, that is, there is no obvious difference in coverage range at the same elevation angle. The wider the beam width, the fewer the corresponding number of wave positions, and the shorter the revisit period under the same residence time. When a user has access needs, the access process can be initiated as soon as possible, but the quality of a single beam will be affected, and the link budget of users located at the edge of the wave position will be reduced accordingly. The narrower the beam width, the more the corresponding number of wave positions, and the longer the revisit period under the same residence time. When a user has access needs, the access process can be initiated only after a long waiting time, but the quality of a single beam is guaranteed, and the link budget of all users located in the wave position remains at a high level. Therefore, the related technology is faced with the dilemma that even using the hopping beam method it is difficult to balance the revisit period and the link budget. The revisit period mainly affects the user access efficiency, and the link budget mainly affects the transmission efficiency. SUMMARY

[0006] Embodiments of the present disclosure provide a beam indication method, device, apparatus and storage medium to solve the technical problem that the NTN scenario in related technologies uses the hopping beam method to balance the revisit period and the link budget.

[0007] In a first aspect, embodiments of the present disclosure provide a beam indication method applied to a terminal, comprising:

[0008] determine a target beam corresponding to the terminal based on a broadcast message received on the first beam; the broadcast message comprises angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam;

[0009] indicate relevant information of the target beam to the spaceborne network device;

[0010] wherein the target beam is a second beam used by the spaceborne network device to serve the terminal.

[0011] In some embodiments, the determining the target beam corresponding to the terminal based on the broadcast message received on the first beam comprises:

[0012] determining relative angle information between the terminal and the spaceborne network device;

[0013] determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message.

[0014] In some embodiments, the determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message comprises:

[0015] determining a target quadrant region of the target beam in a plurality of quadrant regions of a coverage area of the first beam based on a difference between the relative angle information and the angle information of the first beam;

[0016] determining the target beam corresponding to the terminal based on the target quadrant region.

[0017] In some embodiments, the determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message comprises:

[0018] determining a second beam closest to the relative angle information in the angle information of the at least one second beam as the target beam corresponding to the terminal.

[0019] In some embodiments, the broadcast message further comprises satellite positioning information, the satellite positioning information comprising one or more of ephemeris information, a first epoch time and a second epoch time;

[0020] The determining the relative angle information between the terminal and the spaceborne network device comprises:

[0021] determining the relative angle information between the terminal and the spaceborne network device based on the satellite positioning information and position information of the terminal;

[0022] The first epoch time is an epoch time corresponding to angle information of the first beam; and the second epoch time is an epoch time corresponding to angle information of the second beam.

[0023] In some embodiments, the satellite-borne network device is indicated the relevant information of the target beam, including:

[0024] A physical random access channel (PRACH) signal is sent to the satellite-borne network device, and a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the relevant information of the target beam.

[0025] In a second aspect, the embodiments of the present disclosure provide a beam indication method applied to a satellite-borne network device, including:

[0026] A broadcast message is sent based on a first beam; the broadcast message includes angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, and is used for a terminal to determine a target beam corresponding to the terminal;

[0027] The target beam is determined based on relevant information of the target beam indicated by the terminal.

[0028] The target beam is a second beam used by the satellite-borne network device to serve the terminal.

[0029] In some embodiments, the broadcast message further includes satellite positioning information, and the satellite positioning information includes one or more of ephemeris information, a first epoch time and a second epoch time.

[0030] The first epoch time is an epoch time corresponding to angle information of the first beam; and the second epoch time is an epoch time corresponding to angle information of the second beam.

[0031] In some embodiments, the terminal indicates the relevant information of the target beam in the following manner:

[0032] The terminal sends a PRACH signal to the satellite-borne network device, and a preamble index of the PRACH signal and / or a RO to which the PRACH signal belongs has a corresponding relationship with the relevant information of the target beam.

[0033] In a third aspect, the embodiments of the present disclosure provide a terminal including a memory, a transceiver and a processor.

[0034] The memory is configured to store a computer program; the transceiver is configured to transceive data under control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0035] determine a target beam corresponding to the terminal based on a broadcast message received on the first beam; the broadcast message comprises angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam;

[0036] indicate relevant information of the target beam to the spaceborne network device;

[0037] wherein the target beam is a second beam used by the spaceborne network device to serve the terminal.

[0038] In some embodiments, the determining the target beam corresponding to the terminal based on the broadcast message received on the first beam comprises:

[0039] determining relative angle information between the terminal and the spaceborne network device;

[0040] determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message.

[0041] In some embodiments, the determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message comprises:

[0042] determining a target quadrant region in which the target beam is located in a plurality of quadrant regions in which a coverage area of the first beam is divided, based on a difference between the relative angle information and the angle information of the first beam;

[0043] determining the target beam corresponding to the terminal based on the target quadrant region.

[0044] In some embodiments, the determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message comprises:

[0045] determining a second beam closest to the relative angle information in the angle information of the at least one second beam as the target beam corresponding to the terminal.

[0046] In some embodiments, the broadcast message further comprises satellite positioning information, the satellite positioning information comprising one or more of ephemeris information, a first epoch time and a second epoch time;

[0047] The determining the relative angle information between the terminal and the spaceborne network device comprises:

[0048] determining the relative angle information between the terminal and the spaceborne network device based on the satellite positioning information and position information of the terminal;

[0049] The first epoch time is an epoch time corresponding to angle information of the first beam; and the second epoch time is an epoch time corresponding to angle information of the second beam.

[0050] In some embodiments, the terminal is indicated, by a spaceborne network device, with relevant information of the target beam, including:

[0051] The terminal sends, to the spaceborne network device, a physical random access channel (PRACH) signal, a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs, and a corresponding relationship between the PRACH signal and the relevant information of the target beam.

[0052] In a fourth aspect, the embodiments of the present disclosure provide a spaceborne network device, including a memory, a transceiver, and a processor.

[0053] The memory is configured to store a computer program; the transceiver is configured to transceive data under control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0054] The spaceborne network device sends a broadcast message based on a first beam; the broadcast message includes angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, and is used for a terminal to determine a target beam corresponding to the terminal;

[0055] The spaceborne network device determines the target beam based on relevant information of the target beam indicated by the terminal.

[0056] The target beam is a second beam used by the spaceborne network device to serve the terminal.

[0057] In some embodiments, the broadcast message further includes satellite positioning information, and the satellite positioning information includes one or more of ephemeris information, a first epoch time, and a second epoch time.

[0058] The first epoch time is an epoch time corresponding to angle information of the first beam; and the second epoch time is an epoch time corresponding to angle information of the second beam.

[0059] In some embodiments, the terminal indicates the relevant information of the target beam in the following manner:

[0060] The terminal sends, to the spaceborne network device, a physical random access channel (PRACH) signal, a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs, and a corresponding relationship between the PRACH signal and the relevant information of the target beam.

[0061] In a fifth aspect, the embodiments of the present disclosure provide a beam indication apparatus applied to a terminal, including:

[0062] The first determining module is configured to determine a target beam corresponding to the terminal based on a broadcast message received on a first beam; the broadcast message comprises angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam;

[0063] The indicating module is configured to indicate relevant information of the target beam to a spaceborne network device.

[0064] The target beam is a second beam used by the spaceborne network device to serve the terminal.

[0065] In a sixth aspect, an embodiment of the present disclosure provides a beam indication apparatus applied to a spaceborne network device, comprising:

[0066] The sending module is configured to send a broadcast message based on a first beam; the broadcast message comprises angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, and is used by a terminal to determine a target beam corresponding to the terminal.

[0067] The second determining module is configured to determine the target beam based on relevant information of the target beam indicated by the terminal.

[0068] The target beam is a second beam used by the spaceborne network device to serve the terminal.

[0069] In a seventh aspect, an embodiment of the present disclosure further provides a non-transitory readable storage medium, which stores a computer program, and the computer program is used to make a processor execute the beam indication method in the first aspect or the second aspect.

[0070] In an eighth aspect, an embodiment of the present disclosure further provides a processor readable storage medium, which stores a computer program, and the computer program is used to make a processor execute the beam indication method in the first aspect or the second aspect.

[0071] In a ninth aspect, an embodiment of the present disclosure further provides a computer readable storage medium, which stores a computer program, and the computer program is used to make a computer execute the beam indication method in the first aspect or the second aspect.

[0072] In a tenth aspect, an embodiment of the present disclosure further provides a communication device, which stores a computer program, and the computer program is used to make the communication device execute the beam indication method in the first aspect or the second aspect.

[0073] In a eleventh aspect, the present disclosure also provides a chip product, wherein the chip product stores a computer program, and the computer program is used to make the chip product execute the beam indication method in the first aspect or the second aspect.

[0074] The beam indication method, device, apparatus and storage medium provided by the embodiments of the present disclosure can make the terminal determine a second beam used by the spaceborne network device to serve the terminal as a target beam according to the broadcast message, and then indicate the spaceborne network device about the related information of the target beam, so that the revisit period of each beam can be reduced, and the terminal can complete the access in a shorter time while ensuring the quality of a single beam, ensuring the link quality in the access process and the data transmission process, and improving the user access efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0075] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0076] FIG. 1 is a schematic diagram of beam division of a satellite service area provided by the related art;

[0077] FIG. 2 is a schematic diagram of a beam indication method provided by the embodiments of the present disclosure;

[0078] FIG. 3 is a schematic diagram of the elevation angle information and the azimuth angle information provided by the embodiments of the present disclosure;

[0079] FIG. 4 is a schematic diagram of a beam indication method provided by the embodiments of the present disclosure;

[0080] FIG. 5 is a schematic diagram of quadrant region division provided by the embodiments of the present disclosure;

[0081] FIG. 6 is a schematic diagram of the deviation of a terminal and multiple narrow beam center points in a uv plane provided by the embodiments of the present disclosure;

[0082] FIG. 7 is a schematic diagram of the structure of a terminal provided by the embodiments of the present disclosure;

[0083] FIG. 8 is a schematic diagram of the structure of a spaceborne network device provided by the embodiments of the present disclosure;

[0084] FIG. 9 is a schematic diagram of the structure of a beam indication apparatus provided by the embodiments of the present disclosure;

[0085] FIG. 10 is a second structural schematic diagram of a beam indication apparatus provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0086] In the NTN scenario, a hopping beam mode can be adopted to serve different beams in a time-sharing manner using limited physical beams, thereby achieving global coverage within the service area. However, even with the hopping beam scheme, the beam division problem remains to be solved.

[0087] For a single beam, the narrower the beam obtained by antenna shaping, the higher the peak power, which can effectively improve the already tight link budget of the satellite-ground link, but at the same time means that the entire service area needs to be divided into more beams, and the residence time and revisit period of each beam will be affected.

[0088] For example, FIG. 1 is a schematic diagram of beam division of a satellite service area provided by the related art. As shown in FIG. 1, the related art considers that a single satellite service area is divided into 1058 beams in the NTN scenario, and the number of simultaneously activated physical beams is 16, so that each physical beam needs to serve an average of 66 beams. The related art scheme considers that the beam size is a fixed value, and the residence time of the beam in each beam is 5 ms, and then the revisit period is 66*5 = 330 ms, that is, if a user misses the access opportunity this time, he / she needs to wait for 330 ms to initiate the next access.

[0089] Therefore, an embodiment of the present disclosure provides a beam indication method, device, apparatus and storage medium, which can not only make the user complete access faster, but also not affect the working performance of the service beam.

[0090] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present disclosure.

[0091] FIG. 2 is a first flowchart of a beam indication method provided by an embodiment of the present disclosure. As shown in FIG. 2, the present disclosure provides a beam indication method, and the execution subject of the method can be a terminal, such as a mobile phone and the like. The method includes the following steps:

[0092] Step 200: determining a target beam corresponding to the terminal based on a broadcast message received on a first beam; the broadcast message includes angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam.

[0093] Step 201: indicating, to the spaceborne network device, related information of a target beam.

[0094] The target beam is a second beam used by the spaceborne network device to serve the terminal.

[0095] Specifically, the first beam refers to a broadcast beam used by the spaceborne network device to send a broadcast message, and the second beam refers to a dedicated beam used by the spaceborne network device to serve the terminal.

[0096] There is a corresponding relationship between the first beam and the plurality of second beams. In the embodiments of the present disclosure, it can be understood that the first beam covers the service range of the plurality of second beams. Preferably, any first beam can correspond to 2 / 4 / 6 / 8 second beams. The corresponding relationship between the first beam and the plurality of second beams can be predefined, or can be preconfigured by the spaceborne network device and sent to the terminal, and the embodiments of the present disclosure do not limit this.

[0097] It can be understood that by setting the corresponding relationship between the first beam and the plurality of second beams, the number of wave positions divided in a single satellite service area remains unchanged, and the number of activated beams remains unchanged, while the first beam corresponds to a plurality of second beams, and the number of wave positions served by each second beam is reduced. Therefore, under the condition that the residence time of the beam in each wave position remains unchanged, the revisit period can be reduced, and the access efficiency is improved.

[0098] For example, also considering that a single satellite service area is divided into 1058 wave positions, and the number of activated second beams is 16, assuming that each first beam can cover the service range of 4 second beams, then each second beam needs to serve an average of 17 wave positions. Assuming that the residence time of the beam in each wave position is 5 ms, then the revisit period is 17*5=85 ms, that is, when a user misses the current access opportunity, he only needs to wait for 85 ms to initiate the next access, and the access efficiency is significantly improved compared with the related art.

[0099] The spaceborne network device can send a broadcast message on the first beam. The broadcast message can include angle information of the first beam, or the broadcast message can include angle information of at least one second beam corresponding to the first beam, or the broadcast message can include angle information of the first beam and angle information of at least one second beam corresponding to the first beam.

[0100] The broadcast message can be a Synchronization Signaling Block (SSB) message, a System Information Block (SIB) message, or other broadcast messages. For example, the broadcast message can be a SIB1 message or a SIB19 message.

[0101] In some embodiments, the angle information can include the elevation angle information and the azimuth angle information in the station-centered coordinate system defined in the Third Generation Partnership Project (3GPP) Technical Report (TR) 38.821, and FIG. 3 is a schematic diagram of the elevation angle information and the azimuth angle information provided by an embodiment of the present disclosure, where the elevation angle and the azimuth angle correspond to θ and φ in FIG. 3, respectively. wherein the elevation angle ranges from 0 to 90°, and the azimuth angle ranges from 0 to 360°.

[0102] It should be noted that the angle information of the beam in the embodiments of the present disclosure is the angle information corresponding to the center position of the beam, and this concept is consistent throughout the text, and will not be repeated hereinafter.

[0103] Therefore, after receiving the broadcast message on the first beam, the terminal can determine the second beam served by the spaceborne network device for the terminal according to the broadcast message, i.e., the target beam corresponding to the terminal.

[0104] After determining the target beam corresponding to the terminal according to the broadcast message, the terminal can indicate the related information of the target beam to the spaceborne network device, and the related information of the target beam is used to indicate which second beam the target beam is. It should be noted that any information that can enable the spaceborne network device to determine which second beam the target beam is can be used as the related information of the target beam, for example, the related information of the target beam can include the identification information of the target beam.

[0105] Therefore, the spaceborne network device can determine the target beam corresponding to the terminal according to the related information of the target beam indicated by the terminal, and serve the terminal using the target beam.

[0106] The beam indication method provided by the embodiments of the present disclosure can be used to transmit the broadcast message on the first beam by the spaceborne network device, the broadcast message includes the angle information of the first beam and / or the angle information of at least one second beam corresponding to the first beam, the terminal can determine the second beam used by the spaceborne network device to serve it as the target beam according to the broadcast message, and then indicate the related information of the target beam to the spaceborne network device, so as to reduce the revisit period of each beam, and in the case of ensuring the quality of a single beam, ensuring the link quality in the access process and the data transmission process, the terminal can also complete the access in a shorter time, and improve the user access efficiency.

[0107] In some embodiments, determining the target beam corresponding to the terminal based on the broadcast message received on the first beam includes:

[0108] determining the relative angle information between the terminal and the spaceborne network device;

[0109] determine the target beam corresponding to the terminal based on the relative angle information and the broadcast message.

[0110] Specifically, after receiving the broadcast message sent by the spaceborne network device on the first beam, the terminal can first determine the relative angle information between the terminal and the spaceborne network device, and then determine the target beam corresponding to the terminal according to the relative angle information and the angle information of the first beam and / or the angle information of the at least one second beam corresponding to the first beam in the broadcast message.

[0111] The terminal can calculate the relative angle information between the terminal and the spaceborne network device in combination with the position information of the terminal itself and the position information of the spaceborne network device. The specific calculation process can be derived through related formulas, which will not be expanded here.

[0112] In some embodiments, the broadcast message further includes satellite positioning information, and the satellite positioning information includes one or more of ephemeris information, a first epoch time and a second epoch time.

[0113] determining the relative angle information between the terminal and the spaceborne network device includes:

[0114] determining the relative angle information between the terminal and the spaceborne network device based on the satellite positioning information and the position information of the terminal.

[0115] The first epoch time is an epoch time corresponding to the angle information of the first beam, and the second epoch time is an epoch time corresponding to the angle information of the second beam.

[0116] Specifically, the broadcast message sent by the spaceborne network device can include the angle information of the first beam and / or the angle information of the at least one second beam corresponding to the first beam, and the satellite positioning information.

[0117] After receiving the broadcast message sent by the spaceborne network device on the first beam, the terminal can determine the position information of the spaceborne network device according to the satellite positioning information in the broadcast message, and then determine the relative angle information between the terminal and the spaceborne network device in combination with the position information of the terminal itself.

[0118] The satellite positioning information can include one or more of ephemeris information, a first epoch time corresponding to the angle information of the first beam, and a second epoch time corresponding to the angle information of the second beam. It can be understood that in the case where the broadcast message includes the angle information of the first beam, the satellite positioning information can include the first epoch time; in the case where the broadcast message includes the angle information of the second beam, the satellite positioning information can include the second epoch time.

[0119] The ephemeris information includes orbital parameters such as the position, velocity, acceleration, and inclination of the satellite, and the terminal can calculate the position information of the satellite, i.e., the position information of the spaceborne network device, based on the data.

[0120] In some embodiments, when in the earth moving mode, the spaceborne network device changes relative to the ground position, and the terminal can directly calculate the position information of the satellite (spaceborne network device) at the current time based on the ephemeris information, so as to determine the relative angle information between the terminal and the spaceborne network device.

[0121] In some embodiments, when in the earth fixed mode, the spaceborne network device is fixed relative to the ground position, but due to the slight drift of the satellite orbit, the terminal can calculate the position of the satellite (spaceborne network device) at a specific time based on the ephemeris information and the epoch time corresponding to the angle information of the beam, and further obtain more accurate relative angle information between the terminal and the spaceborne network device.

[0122] In some embodiments, the epoch time can be indicated in the form of frame number + subframe number. For example, the frame number takes a value range of 0-1023 and is indicated by 10 bits; and the subframe number takes a value range of 0-9 and is indicated by 4 bits.

[0123] In some embodiments, the spaceborne network device can simultaneously send the first broadcast message and the second broadcast message, the first broadcast message includes the angle information of the first beam and / or the angle information of at least one second beam corresponding to the first beam, and the second broadcast message includes satellite positioning information. The terminal can first determine the relative angle information between the terminal and the spaceborne network device based on the satellite positioning information in the second broadcast message and the position information of the terminal, and then determine the target beam corresponding to the terminal based on the relative angle information and the first broadcast message.

[0124] In some embodiments, based on the relative angle information and the broadcast message, the target beam corresponding to the terminal is determined, including:

[0125] Based on the difference between the relative angle information and the angle information of the first beam, the target beam is determined in a target quadrant region of a plurality of quadrant regions divided by the coverage area of the first beam.

[0126] Based on the target quadrant region, the target beam corresponding to the terminal is determined.

[0127] Specifically, the first beam covers the service range of a plurality of second beams, and therefore the coverage area of the first beam can be divided into a plurality of quadrant regions, each of which corresponds to a second beam.

[0128] In a case where the broadcast message comprises the angle information of the first beam, the terminal can compare the relative angle information and the angle information of the first beam, and determine, according to a difference between the relative angle information and the angle information of the first beam, a quadrant region corresponding to the target beam in the plurality of quadrant regions, i.e., a target quadrant region.

[0129] The relative angle information comprises an elevation angle and an azimuth angle between the terminal and the spaceborne network device, and the angle information of the first beam comprises an elevation angle and an azimuth angle of the first beam. It can be understood that the difference between the relative angle information and the angle information of the first beam comprises a difference between the elevation angle between the terminal and the spaceborne network device and the elevation angle of the first beam, and / or a difference between the azimuth angle between the terminal and the spaceborne network device and the azimuth angle of the first beam.

[0130] It should be noted that the correspondence between the plurality of quadrant regions divided by the first beam and the second beams can be predefined, or can be preconfigured by the spaceborne network device and sent to the terminal, and the embodiments of the present disclosure do not limit the same. Therefore, after the terminal determines the target quadrant region according to the difference between the relative angle information and the angle information of the first beam, the terminal can determine the target beam corresponding to the target quadrant region according to the target quadrant region.

[0131] The following gives some embodiments of the correspondence between the plurality of quadrant regions divided by the first beam and the second beams.

[0132] In some embodiments, the first beam corresponds to two second beams, and the coverage area of the first beam can be divided into two quadrant regions according to the difference in the elevation angle or the difference in the azimuth angle, and one second beam corresponds to one quadrant region.

[0133] For example, the two second beams corresponding to the first beam are beam 1 and beam 2 respectively. The difference between the elevation angle between the terminal and the spaceborne network device and the elevation angle of the first beam is Δθ, and when Δθ is greater than 0, it is determined that the first quadrant region corresponds to beam 1; and when Δθ is less than 0, it is determined that the second quadrant region corresponds to beam 2.

[0134] For another example, the two second beams corresponding to the first beam are beam 1 and beam 2 respectively. The difference between the azimuth angle between the terminal and the spaceborne network device and the azimuth angle of the first beam is Δφ, and when Δφ is greater than 0, it is determined that the first quadrant region corresponds to beam 1; and when Δφ is less than 0, it is determined that the second quadrant region corresponds to beam 2. For another example, the two second beams corresponding to the first beam are beam 1 and beam 2 respectively. The difference between the azimuth angle between the terminal and the spaceborne network device and the azimuth angle of the first beam is Δφ, and when Δφ is greater than 0, it is determined that the first quadrant region corresponds to beam 1; and when Δφ is less than 0, it is determined that the second quadrant region corresponds to beam 2.

[0135] In some embodiments, the first beam corresponds to four second beams, and the coverage area of the first beam can be divided into four quadrant regions according to the difference in the elevation angle and the difference in the azimuth angle, and one second beam corresponds to one quadrant region. ​

[0136] For example, the four second beams corresponding to the first beam are beam 1, beam 2, beam 3, and beam 4. The difference between the top angle between the terminal and the satellite network equipment and the top angle of the first beam is Δθ, and the difference between the azimuth angle between the terminal and the satellite network equipment and the azimuth angle of the first beam is Δθ. Δθ and When both are greater than 0, it is determined to be the first quadrant region, corresponding to beam 1; when Δθ is less than 0, When the value is greater than 0, it is determined to be in the second quadrant region, corresponding to beam 2; Δθ and When both are less than 0, it is determined to be the third quadrant region, corresponding to beam 3; when Δθ is greater than 0, When the value is less than 0, it is determined to be in the fourth quadrant region, corresponding to beam 4.

[0137] In some implementations, the first beam corresponds to two second beams. The coverage area of ​​the first beam can be divided into four quadrants based on the difference in the top angle and the difference in the azimuth angle, with one second beam corresponding to two quadrants.

[0138] For example, the two second beams corresponding to the first beam are beam 1 and beam 2. The difference between the downward angle between the terminal and the satellite network equipment and the downward angle of the first beam is Δθ, and the difference between the azimuth angle between the terminal and the satellite network equipment and the azimuth angle of the first beam is Δθ. Δθ and When both are greater than 0, it is determined to be in the first quadrant region; when Δθ is less than 0, When Δθ is greater than 0, it is determined to be in the second quadrant region; Δθ and When both are less than 0, it is determined to be in the third quadrant region; when Δθ is greater than 0, When the value is less than 0, it is determined to be in the fourth quadrant. Beam 1 and Beam 2 each correspond to two quadrants. When the service range of the second beam is distinguished by the elevation angle (θ), Beam 1 and Beam 2 correspond to the 1 / 4 quadrant and 2 / 3 quadrant, respectively; when the azimuth angle is used... When distinguishing the service range of the second beam, beam 1 and beam 2 correspond to the 1 / 2 quadrant and the 3 / 4 quadrant, respectively.

[0139] In some embodiments, after determining the target beam corresponding to the terminal based on the target quadrant region, the terminal can use the target quadrant region number as the relevant information of the target beam and indicate it to the spaceborne network device. That is, in this case, the relevant information of the target beam may include the target quadrant region number corresponding to the target beam.

[0140] In some embodiments, determining the target beam corresponding to the terminal based on relative angle information and broadcast messages includes:

[0141] In the angle information of the at least one second beam, a second beam closest to the relative angle information is determined as the target beam corresponding to the terminal.

[0142] Specifically, in the case that the broadcast message includes the angle information of the at least one second beam, the terminal can compare the relative angle information with the angle information of the second beam, determine the angle information of the second beam closest to the relative angle information in the angle information of the at least one second beam, and take the second beam closest to the relative angle information as the target beam corresponding to the terminal.

[0143] In some embodiments, the terminal can calculate the difference between the relative angle information and the angle information of the second beam, thereby determining the second beam whose angle information is closest to the relative angle information as the target beam corresponding to the terminal.

[0144] The relative angle information includes the elevation angle and the azimuth angle between the terminal and the spaceborne network device, and the angle information of the second beam includes the elevation angle and the azimuth angle of the second beam. It can be understood that the difference between the relative angle information and the angle information of the second beam includes the difference between the elevation angle between the terminal and the spaceborne network device and the elevation angle of the second beam, and / or the difference between the azimuth angle between the terminal and the spaceborne network device and the azimuth angle of the second beam.

[0145] For example, the difference between the elevation angle between the terminal and the spaceborne network device and the elevation angle of the nth second beam is Δθn n , and the difference between the azimuth angle between the terminal and the spaceborne network device and the azimuth angle of the nth second beam is The terminal can compare the differences of multiple Δθn n and , and select the second beam with the smallest deviation as the target beam corresponding to the terminal.

[0146] In some embodiments, the uv value of the relative angle information and the uv value of the angle information of the second beam can be calculated, and according to the deviation between the uv value of the relative angle information and the uv value of the angle information of the second beam, the second beam with the smallest deviation of the uv value from the uv value of the relative angle information is the second beam whose angle information is closest to the relative angle information, and is taken as the target beam corresponding to the terminal.

[0147] For example, the elevation angle and the azimuth angle of the nth second beam are θn n and The elevation angle and the azimuth angle in the relative angle information are θ and All angle information can be converted into the UV plane specified in 3GPP TR 38.821 according to the following formula to obtain n sets of uv values (u1…u n and v1…vn ), the corresponding uv values (u, v) are obtained by combining the elevation angle and the azimuth angle in the relative angle information, and n sets of difference values can be calculated respectively, and the calculation method is as follows: Δu n = u-u n Δv n = v-v n

[0148] Then, the deviation of the terminal and the narrow beam center point in the uv plane is calculated, and the calculation method is as follows:

[0149] Then, the terminal can select the second beam with the minimum deviation between the uv value and the uv value of the relative angle information as the target beam corresponding to the terminal by comparing the size of the n sets of values.

[0150] In some embodiments, the relevant information of the target beam is indicated to the spaceborne network device, including:

[0151] The physical random access channel (PRACH) signal is sent to the spaceborne network device, and the preamble index of the PRACH signal and / or the random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the relevant information of the target beam.

[0152] Specifically, the terminal indicates the relevant information of the target beam to the spaceborne network device, which can be indicated by sending a physical random access channel (PRACH) signal to the spaceborne network device.

[0153] In the embodiments of the present disclosure, the corresponding relationship between the preamble index of the PRACH signal and the relevant information of the target beam can be set, and the preamble index can be used for separate indication; or the corresponding relationship between the random access opportunity (RO) to which the PRACH signal belongs and the relevant information of the target beam can be set, and the RO can be used for separate indication; or the corresponding relationship between the preamble index of the PRACH signal and the relevant information of the target beam and the corresponding relationship between the RO to which the PRACH signal belongs and the relevant information of the target beam can be set, and the preamble index and the RO can be used for joint indication.

[0154] The corresponding relationship between the preamble index of the PRACH signal and the relevant information of the target beam and the corresponding relationship between the RO to which the PRACH signal belongs and the relevant information of the target beam can be predefined, or can be preconfigured and sent to the terminal by the spaceborne network device, and the embodiments of the present disclosure do not limit this.

[0155] Correspondingly, in a case where a correspondence relationship is set between the preamble index of the PRACH signal and the related information of the target beam, the satellite network device can determine the corresponding target beam through the preamble index of the PRACH signal sent by the terminal; in a case where a correspondence relationship is set between the RO to which the PRACH signal belongs and the related information of the target beam, the satellite network device can determine the corresponding target beam through the RO to which the PRACH signal sent by the terminal belongs; in a case where a correspondence relationship is set between the preamble index of the PRACH signal and the related information of the target beam and a correspondence relationship is set between the RO and the related information of the target beam, the satellite network device can determine the corresponding target beam through the preamble index of the PRACH signal sent by the terminal and the RO to which the PRACH signal belongs.

[0156] In some embodiments, when the preamble index is used for separate indication, the original preamble index (the latter half of the value of the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB) can be divided into multiple groups, and an average allocation or a grouping scheme after overall consideration can be used.

[0157] In some embodiments, when the RO is used for separate indication, it is necessary to support multiple ROs corresponding to a single SSB, and the ROs are divided into multiple groups, and an average allocation or a grouping scheme after overall consideration can be used.

[0158] In some embodiments, when the joint indication mode is used, the preamble index and the RO can be grouped respectively. The grouping of the RO can be given priority, and then the grouping of the preamble index can be considered.

[0159] FIG. 4 is a flowchart of a beam indication method provided by an embodiment of the present disclosure. As shown in FIG. 4, the present embodiment provides a beam indication method, and the execution subject of the method can be a satellite network device, such as a satellite base station. The method includes the following steps:

[0160] Step 400: transmitting a broadcast message based on a first beam; the broadcast message includes angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, and is used for a terminal to determine a target beam corresponding to the terminal.

[0161] Step 401: determining the target beam based on the related information of the target beam indicated by the terminal.

[0162] The target beam is a second beam of the satellite network device used for serving the terminal.

[0163] Specifically, the first beam refers to a broadcast beam used by the satellite network device to transmit the broadcast message, and the second beam refers to a dedicated beam used by the satellite network device to serve the terminal.

[0164] The correspondence between the first beam and the plurality of second beams can be understood as that the first beam covers the service range of the plurality of second beams in the embodiments of the present disclosure. Preferably, any first beam can correspond to 2 / 4 / 6 / 8 second beams. The correspondence between the first beam and the plurality of second beams can be predefined, or can be preconfigured by the spaceborne network device and sent to the terminal, which is not limited in the embodiments of the present disclosure.

[0165] It can be understood that, by setting the correspondence between the first beam and the plurality of second beams, the number of wave positions divided in a single satellite service area remains unchanged, and the number of activated beams remains unchanged, while the first beam corresponds to a plurality of second beams, and the number of wave positions served by each second beam is reduced. Therefore, in the case that the residence time of the beam in each wave position remains unchanged, the revisit period can be reduced, and the access efficiency is improved.

[0166] For example, also considering that the single satellite service area is divided into 1058 wave positions, and the number of activated second beams is 16, assuming that each first beam can cover the service range of 4 second beams, then each second beam needs to serve an average of 17 wave positions. Assuming that the residence time of the beam in each wave position is 5 ms, then the revisit period is 17*5=85 ms, that is, the user only needs to wait for 85 ms to initiate the next access when missing the current access opportunity, and the access efficiency is significantly improved compared with the related art.

[0167] The spaceborne network device can send a broadcast message on the first beam. The broadcast message can include the angle information of the first beam, or the broadcast message can include the angle information of at least one second beam corresponding to the first beam, or the broadcast message can include the angle information of the first beam and the angle information of at least one second beam corresponding to the first beam.

[0168] The broadcast message can be an SSB message, an SIB message or other broadcast message, for example, the broadcast message can be an SIB1 message or an SIB19 message.

[0169] In some embodiments, the angle information can include the elevation angle information and the azimuth angle information in the station-centered coordinate system defined in 3GPP TR 38.821, as shown in FIG. 3, the elevation angle and the azimuth angle correspond to θ and in FIG. 3 respectively. Wherein, the elevation angle is in the range of 0-90°, and the azimuth angle is in the range of 0-360°.

[0170] It should be noted that the angle information of the beam in the embodiments of the present disclosure is the angle information corresponding to the center position of the beam, and this concept is consistent throughout the text and will not be repeated hereinafter.

[0171] Thus, after receiving the broadcast message on the first beam, the terminal can determine the second beam serving the terminal according to the broadcast message, i.e., the target beam corresponding to the terminal.

[0172] After determining the target beam corresponding to the terminal according to the broadcast message, the terminal can indicate the relevant information of the target beam to the spaceborne network device, the relevant information of the target beam being used to indicate which second beam the target beam is, and it should be noted that any information that can enable the spaceborne network device to determine which second beam the target beam is can be used as the relevant information of the target beam, for example, the relevant information of the target beam can include identification information of the target beam.

[0173] Thus, the spaceborne network device can determine the target beam corresponding to the terminal according to the relevant information of the target beam indicated by the terminal, and serve the terminal using the target beam.

[0174] The beam indication method provided by the embodiments of the present disclosure can enable the spaceborne network device to send a broadcast message on a first beam, the broadcast message including angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, the terminal can determine a second beam used by the spaceborne network device to serve it as a target beam according to the broadcast message, and then indicate relevant information of the target beam to the spaceborne network device, thereby reducing the revisit period of each beam, and in the case of ensuring the quality of a single beam, ensuring the link quality in the access process and data transmission process, the terminal can also complete access in a shorter time, improving user access efficiency.

[0175] In some embodiments, the broadcast message further includes satellite positioning information, the satellite positioning information including one or more of ephemeris information, a first epoch time and a second epoch time;

[0176] The first epoch time is an epoch time corresponding to the angle information of the first beam; and the second epoch time is an epoch time corresponding to the angle information of the second beam.

[0177] Specifically, the broadcast message sent by the spaceborne network device can include the angle information of the first beam and / or the angle information of at least one second beam corresponding to the first beam, and satellite positioning information.

[0178] After receiving the broadcast message sent by the spaceborne network device on the first beam, the terminal can determine the position information of the spaceborne network device according to the satellite positioning information in the broadcast message, and then determine the relative angle information between the terminal and the spaceborne network device in combination with the position information of the terminal itself. Then, the terminal determines the target beam corresponding to the terminal according to the relative angle information and the angle information of the first beam and / or the angle information of at least one second beam corresponding to the first beam in the broadcast message.

[0179] The satellite positioning information can include one or more of ephemeris information, a first time of epoch corresponding to the angle information of the first beam, and a second time of epoch corresponding to the angle information of the second beam. It can be understood that, in a case where the broadcast message includes the angle information of the first beam, the satellite positioning information can include the first time of epoch; in a case where the broadcast message includes the angle information of the second beam, the satellite positioning information can include the second time of epoch.

[0180] The ephemeris information includes orbital parameters such as a position, a velocity, an acceleration, an inclination angle, and the like of the satellite, and the terminal can calculate the position information of the satellite, i.e., the position information of the spaceborne network device, through the data.

[0181] In some embodiments, when in the earth moving mode, the spaceborne network device is constantly changing relative to the ground position, and the terminal can directly calculate the position information of the satellite (spaceborne network device) at the current time through the ephemeris information, so as to determine the relative angle information between the terminal and the spaceborne network device.

[0182] In some embodiments, when in the earth fixed mode, the spaceborne network device is fixed relative to the ground position, but due to the possible slight drift of the satellite orbit, the terminal can combine the ephemeris information and the time of epoch corresponding to the angle information of the beam to calculate the position of the satellite (spaceborne network device) at a specific time, and further obtain more accurate relative angle information between the terminal and the spaceborne network device.

[0183] In some embodiments, the time of epoch can be indicated in the form of a frame number + a subframe number. For example, the frame number takes a value range of 0-1023 and is indicated by 10 bits; and the subframe number takes a value range of 0-9 and is indicated by 4 bits.

[0184] In some embodiments, the terminal indicates the related information of the target beam in the following manner:

[0185] The terminal sends a physical random access channel (PRACH) signal to the spaceborne network device, and a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the related information of the target beam.

[0186] Specifically, the terminal indicates the related information of the target beam to the spaceborne network device, which can be indicated by sending a physical random access channel (PRACH) signal to the spaceborne network device.

[0187] In the embodiments of the present disclosure, a correspondence relationship between a preamble index of a PRACH signal and related information of a target beam can be set, and the preamble index can be used for separate indication; or a correspondence relationship between a random access occasion (RO) to which the PRACH signal belongs and the related information of the target beam can be set, and the RO can be used for separate indication; or a correspondence relationship between the preamble index of the PRACH signal and the related information of the target beam and a correspondence relationship between the RO to which the PRACH signal belongs and the related information of the target beam can be set, and the preamble index and the RO can be used for joint indication.

[0188] The correspondence relationship in the embodiments of the present disclosure can also be understood as a mapping relationship. For example, the correspondence relationship between the preamble index of the PRACH signal and the related information of the target beam can be understood as a mapping relationship between the preamble index of the PRACH signal and the related information of the target beam; and the correspondence relationship between the RO to which the PRACH signal belongs and the related information of the target beam can be understood as a mapping relationship between the RO to which the PRACH signal belongs and the related information of the target beam.

[0189] The correspondence relationship between the preamble index of the PRACH signal and the related information of the target beam and the correspondence relationship between the RO to which the PRACH signal belongs and the related information of the target beam can be predefined, or can be preconfigured and sent to the terminal by the spaceborne network device, and the embodiments of the present disclosure do not limit this.

[0190] Correspondingly, in the case where the correspondence relationship between the preamble index of the PRACH signal and the related information of the target beam is set, the spaceborne network device can determine the corresponding target beam through the preamble index of the PRACH signal sent by the terminal; in the case where the correspondence relationship between the RO to which the PRACH signal belongs and the related information of the target beam is set, the spaceborne network device can determine the corresponding target beam through the RO to which the PRACH signal sent by the terminal belongs; and in the case where the correspondence relationship between the preamble index of the PRACH signal and the related information of the target beam and the correspondence relationship between the RO and the related information of the target beam are set, the spaceborne network device can determine the corresponding target beam through the preamble index of the PRACH signal sent by the terminal and the RO to which the PRACH signal belongs.

[0191] In some embodiments, when the preamble index is used for separate indication, the original preamble index (the value of the latter half part of the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB) can be divided into multiple groups, and an average allocation or a grouping scheme after overall consideration can be used.

[0192] In some embodiments, when the RO is indicated alone, multiple ROs corresponding to a single SSB need to be supported and these ROs are divided into multiple groups, and an average allocation or a grouping scheme after overall consideration can be used.

[0193] In some embodiments, when the joint indication method is used, the preamble index and the RO can be grouped respectively. The grouping of the RO can be considered first, and then the grouping of the preamble index can be considered.

[0194] The beam indication method provided by the embodiments of the present disclosure is further explained below through examples in specific application scenarios.

[0195] Embodiment one:

[0196] The network side transmits a broadcast message using a wide beam, and the wide beam angle information carried in the broadcast message can only carry a set of angle values (θ0and ) corresponding to the center position of the wide beam and the epoch time (t0, if necessary), and the terminal calculates the elevation angle and the azimuth angle (θand ) relative to the satellite through its own position information and satellite position information, compares one or two of the wide beam center position indication angles, and divides the wide beam coverage area into 2 or 4 quadrants, so as to distinguish the quadrant area, and the specific scheme is as follows:

[0197] Δθ=θ-θ0, earth moving mode

[0198] Δθ=θ-θ1, earth fixed mode

[0199] earth moving mode

[0200] earth fixed mode

[0201] Wherein, θ1and are the wide beam angle information at the current time (t1) calculated according to the epoch time and θ0and , which is only required for working in the earth fixed mode.

[0202] FIG. 5 is a schematic diagram of the quadrant area division provided by the embodiments of the present disclosure, as shown in FIG. 5, when the wide beam area is divided into 4 quadrant areas, each narrow beam corresponds to a quadrant area, and when Δθand are both greater than 0, it is determined as the first quadrant area; Δθis less than 0, is greater than 0, it is determined as the second quadrant area; Δθand When both are less than 0, it is determined as the third quadrant region; Δθ is greater than 0, When both are less than 0, it is determined as the fourth quadrant region.

[0203] The terminal can use PRACH resource implicit indication 2 bits (bit) information for reporting the narrow beam quadrant where it is located, and the correspondence between the indicated 2bit information and the quadrant number is shown in Table 1:

[0204] Table 1 Correspondence between 2bit information and quadrant number

[0205] The PRACH resource includes preamble index and RO two types, and one type or both types can be used for joint indication. When using preamble index alone for indication, the original preamble index (the latter half of the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB value) is divided into 4 groups, and the average allocation or grouping scheme after overall consideration can be used; When using RO alone for indication, it is necessary to support 4 or more than 4 ROs corresponding to a single SSB (the former half of the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB value is 1 / 8 or 1 / 4), and these ROs are divided into 4 groups, and the average allocation or grouping scheme after overall consideration can be used; When using joint indication, RO grouping is preferred, and then preamble index grouping is considered.

[0206] When the wide beam region is divided into 4 quadrant regions, each narrow beam corresponds to 2 quadrant regions, and the elevation angle (θ) is used to distinguish the service range of the narrow beam, two narrow beams correspond to 1 / 4 quadrant and 2 / 3 quadrant respectively, and the belonging narrow beam is determined according to the quadrant number reported by the terminal;

[0207] When the wide beam region is divided into 4 quadrant regions, each narrow beam corresponds to 2 quadrant regions, and the azimuth angle is used to distinguish the service range of the narrow beam, two narrow beams correspond to 1 / 2 quadrant and 3 / 4 quadrant respectively, and the belonging narrow beam is determined according to the quadrant number reported by the terminal;

[0208] After the terminal reports the quadrant where it is located, the network side schedules the narrow beam for subsequent access and data transmission services.

[0209] Among them, the behaviors of the network side and the terminal side are as follows:

[0210] Network side:

[0211] (1) In the broadcast message, the angle information (elevation angle and azimuth angle) corresponding to the center position of the current wide beam is sent. When working in the earth fixed mode, the epoch time corresponding to the angle information is additionally broadcasted.

[0212] (2) The network schedules the narrow beam to provide subsequent access and data transmission services for the terminal according to the narrow beam serial number implicitly indicated by the terminal through the PRACH resource.

[0213] Terminal side:

[0214] (1) The terminal receives the angle information (elevation angle and azimuth angle) corresponding to the center position of the wide beam contained in the broadcast message.

[0215] (2) The terminal calculates the elevation angle and azimuth angle relative to the satellite according to its own position and ephemeris information.

[0216] (3) The terminal compares the angle information calculated in the previous step with the angle information of the center position of the wide beam in the broadcast, and determines the quadrant.

[0217] (4) The terminal feeds back the quadrant information to the base station side using the PRACH resource.

[0218] Embodiment two:

[0219] The network side sends a broadcast message using a wide beam, and the narrow beam angle information attached in the broadcast message includes n sets of angle values (θ1…θ n and ) corresponding to the center positions of all n narrow beams. N can be 1 / 2 / 4 / 6 / 8, corresponding to a maximum of 3-bit indication information. The terminal calculates the elevation angle and azimuth angle (θ and ) relative to the satellite through its own position information and satellite position information, and converts all angle information into the UV plane specified in 3GPP TR 38.821 according to the following formula, then n sets of uv values (u1…u n and v1…v n ) corresponding to the center positions of the n narrow beams can be obtained. The terminal obtains a corresponding set of uv values (u, v) according to the elevation angle and azimuth angle calculated relative to the satellite, and calculates n sets of difference values respectively, the calculation method is as follows: Δu n =u-u n Δv n =v-v n

[0220] Then the deviation of the terminal and the center point of the narrow beam in the UV plane is calculated. FIG. 6 is a schematic diagram of the deviation of the terminal and the center points of multiple narrow beams in the UV plane provided by the embodiment of the disclosure, as shown in FIG. 6, the deviation calculation method is as follows:

[0221] After comparing the size of the n group values, the one with the smallest deviation is selected for reporting. The reporting mechanism is similar to scheme one, and PRACH resources are used for reporting. PRACH resources include preamble index and RO, and one or both can be used for joint indication. When using preamble index alone for indication, the supported preamble index is divided into n groups according to the preamble format and the allocated RO, and the average allocation or the grouping scheme after overall consideration can be used; when using RO alone for indication, n or more ROs corresponding to a single SSB need to be supported, and these ROs are divided into n groups, and the average allocation or the grouping scheme after overall consideration can be used; when using joint indication, RO is preferred for grouping, and then preamble index is considered.

[0222] For example, n = 8, 3 bits of indication information are required, and the correspondence between 3 bits of indication information and narrow beam serial number is shown in Table 2:

[0223] Table 2 Correspondence between 3 bits of indication information and narrow beam serial number

[0224] After the terminal reports the quadrant in which it is located, the base station side schedules narrow beams for subsequent access and data transmission services.

[0225] The behaviors of the network side and the terminal side are as follows:

[0226] Network side:

[0227] (1) In the broadcast message, the angle information (elevation angle and azimuth angle) corresponding to the center position of the n narrow beams covered by the current wide beam is sent, and when working in the earth fixed mode, the epoch moment corresponding to the angle information is additionally broadcasted.

[0228] (2) The network schedules narrow beams for the terminal to provide subsequent access and data transmission services according to the narrow beam serial number implicitly indicated by the terminal through PRACH resources.

[0229] Terminal side:

[0230] (1) The terminal receives the angle information (elevation angle and azimuth angle) corresponding to the center position of the n narrow beams contained in the broadcast message.

[0231] (2) The terminal calculates the elevation angle and azimuth angle relative to the satellite according to its own position and ephemeris information.

[0232] (3) The terminal converts the angle information of the n narrow beams and its own angle information relative to the satellite into uv plane coordinates.

[0233] (4) The terminal compares the uv coordinate information calculated in the previous step with the n narrow beams one by one, and determines the narrow beam number with the smallest deviation.

[0234] (5) The terminal feeds back the narrow beam number to the base station side using the PRACH resource.

[0235] Embodiment three:

[0236] The system works in the earth moving mode, each wide beam contains 4 narrow beams, the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB takes the value (1 / 2, 32), that is, each SSB corresponds to 2 ROs and 32 preambles.

[0237] The base station additionally broadcasts the elevation angle and azimuth angle (θ0and ) corresponding to the wide beam center point in SIB19, the elevation angle (θ0) is indicated by 22 bits, the indication precision is 90° / (2^22), the azimuth angle is indicated by 24 bits, the indication precision is 360° / (2^24), and the total load is 22+24=46 bits.

[0238] The terminal calculates the position coordinates (x, y, z) of the satellite at the current time based on the ephemeris information broadcast in SIB19, and calculates the elevation angle and azimuth angle (θand ) relative to the satellite in combination with the own position information (x0, y0, z0).

[0239] The terminal calculates the difference (Δθand ) between the own angle information and the wide beam center point angle information, where Δθ is less than 0, greater than 0, according to the mapping rule, it should belong to the second quadrant, and the corresponding 2-bit indication information should be 01.

[0240] The terminal uses the joint indication mode of preamble index and RO, and preferentially uses the high bit (0) of RO indication, selects the first RO in the two ROs; and then uses the low bit (1) of preamble index indication, selects the last 16 initiations of preamble index.

[0241] The network side obtains that the terminal is located in the second quadrant of the wide beam according to the PRACH resource, and schedules the corresponding narrow beam to perform subsequent access process and data transmission.

[0242] Embodiment four:

[0243] The system works in the earth fixed mode, each wide beam contains 2 narrow beams, and is distinguished by the elevation angle, the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB takes the value (1, 16), that is, 1 RO and 16 Preambles correspond to each SSB.

[0244] The base station additionally broadcasts the elevation angle and azimuth angle (θ0 and φ0) corresponding to the wide beam center point and the epoch time t0 in SIB19, the elevation angle (θ0) is indicated by 22 bits, the indication accuracy is 90° / (2^22), the azimuth angle is indicated by 24 bits, the indication accuracy is 360° / (2^24), the epoch time is indicated by the frame number + subframe number in total 14 bits, and the total load is 22+24+14=60 bits.

[0245] The terminal calculates the current time (t1), the position coordinates (x, y, z) and the angle information (θ1 and ) of the satellite based on the ephemeris information broadcast in SIB19 and the epoch time, and calculates the elevation angle and azimuth angle (θ and ) relative to the satellite based on the position information (x0, y0, z0) of the terminal.

[0246] The terminal calculates the difference (Δθ and ) between the angle information of the terminal and the angle information of the wide beam center point, wherein Δθ and are both less than 0, and according to the mapping rule, they belong to the third quadrant, and the corresponding 2-bit indication information should be 10.

[0247] The terminal uses the indication mode of preamble index, the preamble index is evenly divided into 4 groups, 11 corresponds to the third group, and the corresponding index value is the 8th-11th.

[0248] The network side obtains that the terminal is located in the third quadrant of the wide beam according to the PRACH resource, and according to the mapping rule, 2 / 3 quadrants are the same narrow beam when distinguished by the elevation angle, and schedules the corresponding narrow beam for subsequent access process and data transmission.

[0249] Embodiment five:

[0250] The system works in the earth moving mode, each wide beam contains 8 narrow beams, corresponding to 3-bit indication information, the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB takes the value (1 / 2, 16), that is, 2 ROs and 16 Preambles correspond to each SSB.

[0251] The base station additionally broadcasts the elevation angle and azimuth angle (θ1…θ8) corresponding to the 8 groups of narrow beam center points in SIB1. n And In each group of angle information, the elevation angle (θ0) is indicated by 22 bits, with an indication accuracy of 90° / (2^22), and the azimuth angle is indicated by 24 bits, with an indication accuracy of 360° / (2^24), and the total load is 8*(22+24)=368 bits.

[0252] The terminal calculates the position coordinates (x, y, z) of the satellite at the current time based on the ephemeris information broadcast in SIB1, and calculates the elevation angle and azimuth angle (θ and ) relative to the satellite and the uv plane coordinates (u, v) in combination with the own position information (x0, y0, z0).

[0253] The terminal converts the angle information of multiple narrow beams to uv plane coordinates (u1…un and v1…vn).

[0254] The terminal compares the uv value of itself with the uv values of multiple narrow beams, and the narrow beam sequence number closest to the distance is 6, and the corresponding 3-bit indication information is 101.

[0255] The terminal adopts a joint indication mode of preamble index and RO, preferentially indicates the high bit (1) of RO, selects the second RO of the two ROs, and then indicates the low 2-bit (01) of the preamble index to initiate access by selecting the first part (0-15) of the preamble index.

[0256] The network side obtains that the terminal is located in the 6th narrow beam mapping area according to the PRACH resource, and schedules the corresponding narrow beam to perform subsequent access process and data transmission.

[0257] FIG. 7 is a structural schematic diagram of a terminal provided by an embodiment of the present disclosure, as shown in FIG. 7, the terminal comprises a memory 703, a transceiver 701, and a processor 702, wherein:

[0258] The memory 703 is configured to store a computer program; the transceiver 701 is configured to transceive data under the control of the processor 702; and the processor 702 is configured to read the computer program in the memory 703 and perform the following operations:

[0259] Determine the target beam corresponding to the terminal based on the broadcast message received on the first beam; the broadcast message comprises the angle information of the first beam and / or the angle information of at least one second beam corresponding to the first beam;

[0260] Indicating, to a spaceborne network device, related information of a target beam;

[0261] The target beam is a second beam used by the spaceborne network device to serve the terminal.

[0262] In FIG. 7, the bus architecture can include any number of interconnecting buses and bridges, and the various circuitry representative of the processor(s) 702 and the memory 703 that are linked together by the bus architecture, which can be, for example, but not limited to, a motherboard. The bus architecture can also link together various other circuitry, which is well known in the art, including the peripheral devices, voltage regulators, power management circuitry, and the like, thus, not further described herein. The bus interface provides an interface to the bus architecture. The transceiver 701 can be a plurality of elements, including a transmitter and a receiver, which are used to communicate with various other apparatus over a transmission medium, which includes, but is not limited to, a wireless channel, a wired channel, optical cable, and the like. The user interface 704 can also be an interface that can be connected to the required devices externally or internally, including, but not limited to, a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0263] The processor 702 is responsible for managing the bus architecture and general processing, and the memory 703 can store data used by the processor 702 in performing operations.

[0264] In some embodiments, the processor 702 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor can also adopt a multi-core architecture.

[0265] The processor executes any of the methods provided by the embodiments of the present disclosure according to the executable instructions obtained by calling the computer program stored in the memory. The processor and the memory can also be physically arranged separately.

[0266] In some embodiments, based on the broadcast message received on the first beam, the target beam corresponding to the terminal is determined, including:

[0267] Determining the relative angle information between the terminal and the spaceborne network device;

[0268] Based on the relative angle information and the broadcast message, the target beam corresponding to the terminal is determined.

[0269] In some embodiments, the target beam corresponding to the terminal is determined based on the relative angle information and the broadcast message, including:

[0270] The target beam is determined in a target quadrant region of the first beam coverage region division based on a difference between the relative angle information and the angle information of the first beam.

[0271] The target beam corresponding to the terminal is determined based on the target quadrant region.

[0272] In some embodiments, the target beam corresponding to the terminal is determined based on the relative angle information and the broadcast message, including:

[0273] In the angle information of at least one second beam, the second beam closest to the relative angle information is determined as the target beam corresponding to the terminal.

[0274] In some embodiments, the broadcast message further includes satellite positioning information, and the satellite positioning information includes one or more of ephemeris information, a first epoch time and a second epoch time.

[0275] The relative angle information between the terminal and the spaceborne network device is determined, including:

[0276] The relative angle information between the terminal and the spaceborne network device is determined based on the satellite positioning information and the position information of the terminal.

[0277] The first epoch time is an epoch time corresponding to the angle information of the first beam; and the second epoch time is an epoch time corresponding to the angle information of the second beam.

[0278] In some embodiments, the target beam related information is indicated to the spaceborne network device, including:

[0279] The PRACH signal is sent to the spaceborne network device; and the preamble index of the PRACH signal and / or the random access opportunity RO to which the PRACH signal belongs has a corresponding relationship with the target beam related information.

[0280] It should be noted that the terminal provided by the embodiments of the present disclosure can realize all the method steps realized by the method embodiments of the execution subject being the terminal, and achieve the same technical effects. Therefore, the same parts and beneficial effects of the method embodiments in the embodiments will not be described in detail here.

[0281] FIG. 8 is a structural schematic diagram of a spaceborne network device provided by the embodiments of the present disclosure, as shown in FIG. 8, the spaceborne network device includes a memory 803, a transceiver 801, and a processor 802, wherein:

[0282] The memory 803 is configured to store a computer program; the transceiver 801 is configured to transceive data under the control of the processor 802; the processor 802 is configured to read the computer program in the memory 803 and perform the following operations:

[0283] transmit a broadcast message based on the first beam; the broadcast message comprises angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, for the terminal to determine a target beam corresponding to the terminal;

[0284] determine the target beam based on the related information of the target beam indicated by the terminal;

[0285] The target beam is a second beam of the spaceborne network device for serving the terminal.

[0286] In FIG. 8, the bus architecture can include any number of interconnecting buses and bridges, and the various circuitries represented by the processor 802 and the memory 803 are linked by one or more buses, which are represented by the processor 802. The bus architecture can also link various other circuitries such as peripheral devices, voltage stabilizers, and power management circuitries, which are well known in the art, and thus, further description thereof will not be provided herein. The bus interface provides an interface. The transceiver 801 can be a plurality of elements, i.e., including a transmitter and a receiver, which provide units for communicating with various other devices on transmission media, including wireless channels, wired channels, optical cables, and the like. The processor 802 is responsible for managing the bus architecture and general processing, and the memory 803 can store data used by the processor 802 in performing operations.

[0287] The processor 802 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor can also adopt a multi-core architecture.

[0288] In some embodiments, the broadcast message further comprises satellite positioning information, the satellite positioning information comprising one or more of ephemeris information, a first epoch time, and a second epoch time;

[0289] The first epoch time is an epoch time corresponding to the angle information of the first beam; and the second epoch time is an epoch time corresponding to the angle information of the second beam.

[0290] In some embodiments, the terminal indicates the related information of the target beam in the following manner:

[0291] The terminal sends a physical random access channel (PRACH) signal to the spaceborne network device, and a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the related information of the target beam.

[0292] Specifically, the spaceborne network device provided by the above embodiment of the disclosure can implement all the method steps of the method embodiment in which the execution subject is the spaceborne network device, and achieve the same technical effects. Here, the same parts and beneficial effects of the method embodiment in this embodiment will not be described in detail.

[0293] FIG. 9 is a structural schematic diagram of a beam indication apparatus provided by an embodiment of the disclosure. As shown in FIG. 9, the beam indication apparatus provided by an embodiment of the disclosure is applied to a terminal and includes a first determination module 900 and an indication module 910, where:

[0294] The first determination module 900 is configured to determine a target beam corresponding to the terminal based on a broadcast message received on a first beam. The broadcast message includes angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam.

[0295] The indication module 910 is configured to indicate, to a spaceborne network device, related information of the target beam.

[0296] The target beam is a second beam of the spaceborne network device used to serve the terminal.

[0297] In some embodiments, determining the target beam corresponding to the terminal based on the broadcast message received on the first beam includes:

[0298] Determining relative angle information between the terminal and the spaceborne network device.

[0299] Determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message.

[0300] In some embodiments, determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message includes:

[0301] Determining a target quadrant region in which the target beam is located in a plurality of quadrant regions divided by the first beam based on a difference between the relative angle information and the angle information of the first beam.

[0302] Determining the target beam corresponding to the terminal based on the target quadrant region.

[0303] In some embodiments, determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message includes:

[0304] In the angle information of the at least one second beam, a second beam closest to the relative angle information is determined as the target beam corresponding to the terminal.

[0305] In some embodiments, the broadcast message further includes satellite positioning information, and the satellite positioning information includes one or more of ephemeris information, a first epoch time and a second epoch time.

[0306] The relative angle information between the terminal and the spaceborne network device is determined, including:

[0307] The relative angle information between the terminal and the spaceborne network device is determined based on the satellite positioning information and the position information of the terminal.

[0308] The first epoch time is an epoch time corresponding to the angle information of the first beam, and the second epoch time is an epoch time corresponding to the angle information of the second beam.

[0309] In some embodiments, the related information of the target beam is indicated to the spaceborne network device, including:

[0310] The PRACH signal is sent to the spaceborne network device, and the preamble index of the PRACH signal and / or the random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the related information of the target beam.

[0311] Specifically, the beam indication apparatus provided by the embodiments of the present disclosure can realize all the method steps realized by the method embodiments of the execution subject being the terminal, and achieve the same technical effects. Here, the same parts and beneficial effects in the method embodiments will not be described in detail.

[0312] FIG. 10 is a structural schematic diagram of a beam indication apparatus provided by the embodiments of the present disclosure. As shown in FIG. 10, the embodiments of the present disclosure provide a beam indication apparatus applied to a spaceborne network device, which includes a sending module 1000 and a second determination module 1010, wherein:

[0313] The sending module 1000 is configured to send a broadcast message based on the first beam. The broadcast message includes angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, which is used by the terminal to determine a target beam corresponding to the terminal.

[0314] The second determination module 1010 is configured to determine the target beam based on the related information of the target beam indicated by the terminal.

[0315] The target beam is a second beam used by the spaceborne network device to serve the terminal.

[0316] In some embodiments, the broadcast message further comprises satellite positioning information, the satellite positioning information comprising one or more of ephemeris information, a first time of epoch, and a second time of epoch.

[0317] The first time of epoch is a time of epoch corresponding to the angle information of the first beam, and the second time of epoch is a time of epoch corresponding to the angle information of the second beam.

[0318] In some embodiments, the terminal indicates the information related to the target beam in the following manner:

[0319] The terminal sends a physical random access channel (PRACH) signal to the spaceborne network device, and a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the information related to the target beam.

[0320] Specifically, the beam indication apparatus provided in the embodiments of the present disclosure can implement all the method steps implemented by the method embodiments in which the execution subject is the spaceborne network device, and achieve the same technical effects. Here, the same parts and beneficial effects in the method embodiments will not be described in detail.

[0321] It should be noted that the division of units / modules in the above embodiments of the present disclosure is illustrative, and is merely a logical function division. In actual implementation, another division manner can be used. In addition, each functional unit in each embodiment of the present disclosure can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0322] When the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solutions of the present disclosure, essentially or in part, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in the various embodiments of the present disclosure. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, and various other media that can store program codes.

[0323] In some embodiments, a non-transitory readable storage medium storing a computer program is also provided, where the computer program is configured to enable a processor to perform the beam indication method provided by any of the above method embodiments.

[0324] Specifically, the above non-transitory readable storage medium provided by the embodiments of the present disclosure can implement all the method steps of the above method embodiments and achieve the same technical effects. Therefore, the same parts and beneficial effects of the embodiments of the present disclosure as the method embodiments will not be repeated in detail.

[0325] It should be noted that the non-transitory readable storage medium can be any available medium accessible by the processor, including but not limited to a magnetic storage (such as a floppy disk, a hard disk, a magnetic tape, a magneto-optical disk (MO), etc.), an optical storage (such as a CD, a DVD, a BD, a HVD, etc.), and a semiconductor storage (such as a ROM, an EPROM, an EEPROM, a NAND FLASH, a solid-state disk (SSD), etc.).

[0326] In some embodiments, a processor-readable storage medium storing a computer program is also provided, where the computer program is configured to enable a processor to perform the beam indication method provided by any of the above method embodiments.

[0327] Specifically, the above processor-readable storage medium provided by the embodiments of the present disclosure can implement all the method steps of the above method embodiments and achieve the same technical effects. Therefore, the same parts and beneficial effects of the embodiments of the present disclosure as the method embodiments will not be repeated in detail.

[0328] In some embodiments, a computer-readable storage medium storing a computer program is also provided, where the computer program is configured to enable a computer to perform the beam indication method provided by any of the above method embodiments.

[0329] Specifically, the above computer-readable storage medium provided by the embodiments of the present disclosure can implement all the method steps of the above method embodiments and achieve the same technical effects. Therefore, the same parts and beneficial effects of the embodiments of the present disclosure as the method embodiments will not be repeated in detail.

[0330] In some embodiments, a communication device storing a computer program is also provided, where the computer program is configured to enable the communication device to perform the beam indication method provided by any of the above method embodiments.

[0331] Specifically, the communication device provided by the embodiment of the present disclosure can realize all the method steps achieved by the above-mentioned method embodiments and achieve the same technical effects. Here, the same parts and beneficial effects of the embodiment as the method embodiments will not be repeated in detail.

[0332] In some embodiments, a chip product is also provided, and the chip product has stored therein a computer program. The computer program is configured to enable the chip product to perform the beam indication method provided by the above-mentioned method embodiments.

[0333] Specifically, the chip product provided by the embodiment of the present disclosure can realize all the method steps achieved by the above-mentioned method embodiments and achieve the same technical effects. Here, the same parts and beneficial effects of the embodiment as the method embodiments will not be repeated in detail.

[0334] In addition, it should be noted that the terms "first", "second" and the like in the embodiments of the present disclosure are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" are generally of a kind and do not limit the number of objects, for example, the first object can be one or more.

[0335] In the embodiments of the present disclosure, the term "and / or" describes the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after it are in an "or" relationship.

[0336] In the embodiments of the present disclosure, the term "a plurality of" means two or more, and other quantifiers are similar.

[0337] The technical solutions provided by the embodiments of the present disclosure can be applied to various systems, especially 5G systems or 6G systems. For example, the applicable systems can be global system of mobile communication (GSM) systems, code division multiple access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) general packet radio service (GPRS) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, long term evolution advanced (LTE-A) systems, universal mobile systems (UMTS), worldwide interoperability for microwave access (WiMAX) systems, 5G new radio (NR) systems, 6G systems, and the like. Among these various systems, there are terminal devices and network devices. The system can also include a core network part, such as an evolved packet system (EPS), a 5G system (5GS), and the like.

[0338] The terminal device to which the embodiments of the present disclosure relate can refer to a device providing voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem, etc. In different systems, the name of the terminal device can also be different, for example, in the 5G system, the terminal device can be called a user equipment (UE). The wireless terminal device can communicate with one or more core networks (CN) through a radio access network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or called a "cellular" phone) and a computer with a mobile terminal device, for example, it can be a portable, pocket, handheld, computer built-in or vehicle-mounted mobile device, which exchanges language and / or data with the radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), etc. The wireless terminal device can also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a user device, which is not limited in the embodiments of the present disclosure.

[0339] The network device related to the embodiments of the present disclosure can be a base station, which can include a plurality of cells serving terminals. According to different application scenarios, the base station can also be referred to as an access point, or can be a device in an access network that communicates with wireless terminal devices through one or more sectors over an air interface, or other names. The network device can be used to exchange received air frames and Internet Protocol (IP) packets as a router between the wireless terminal device and the rest of the access network, which can include an Internet Protocol (IP) communication network. The network device can also coordinate the management of the properties of the air interface. For example, the network device related to the embodiments of the present disclosure can be a network device (Base Transceiver Station, BTS) in the Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (LTE) system, or a 5G base station (gNB) in a next generation system, or a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., which are not limited in the embodiments of the present disclosure. In some network structures, the network device can include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit can also be geographically separated.

[0340] In the present disclosure, “determining B based on A” means that A is considered as a factor when determining B. It is not limited to “B can be determined based on A only”, but also includes “B is determined based on A and C”, “B is determined based on A, C and E”, “C is determined based on A, and B is further determined based on C”, and the like. In addition, it can also include that A is used as a condition for determining B, for example, “when A meets a first condition, B is determined using a first method”; for example, “when A meets a second condition, B is determined”; for example, “when A meets a third condition, B is determined based on a first parameter”; and the like. Of course, A can also be used as a condition for determining B, for example, “when A meets a first condition, C is determined using a first method, and B is further determined based on C”; and the like.

[0341] The network device and the terminal device can each use one or more antennas for multi-input multi-output (MIMO) transmission, which can be single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO). According to the shape and number of root antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, and can also be diversity transmission, precoding transmission, or beamforming transmission, etc.

[0342] Those skilled in the art should understand that the embodiments of the present disclosure can be provided as a method, a system, or a computer program product. Therefore, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure 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 code.

[0343] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present disclosure. 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 executable instructions. These computer executable instructions can be provided to 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 a means for implementing the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0344] These processor-executable instructions can also be stored in a processor-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 processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart(s) or flowchart block or blocks and / or the function specified in the block diagram block or blocks.

[0345] These processor-executable 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(s) or flowchart block or blocks and / or the functions specified in the block diagram block or blocks.

[0346] Obviously, numerous modifications and variations of the present disclosure are possible in light of the above teachings. It is therefore to be understood that within the scope of the present disclosure, the disclosure can be practiced otherwise than as specifically set out herein. Accordingly, any one of the modifications or variations above can be combined with any other of the modifications or variations above to produce yet further modifications and variations within the scope of the present disclosure.

Claims

1. A beam indication method applied to a terminal, comprising: determining a target beam corresponding to the terminal based on a broadcast message received on a first beam; the broadcast message comprising angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam; indicating relevant information of the target beam to a spaceborne network device; wherein the target beam is a second beam used by the spaceborne network device to serve the terminal.

2. The beam indication method of claim 1, wherein, determining a target beam corresponding to the terminal based on a broadcast message received on a first beam, comprising: determining relative angle information between the terminal and the spaceborne network device; determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message.

3. The beam indication method of claim 2, wherein, determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message, comprising: determining a target quadrant region in a plurality of quadrant regions divided by a coverage area of the first beam based on a difference between the relative angle information and the angle information of the first beam; determining the target beam corresponding to the terminal based on the target quadrant region.

4. The beam indication method of claim 2, wherein, determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message, comprising: determining a second beam closest to the relative angle information in the angle information of the at least one second beam as the target beam corresponding to the terminal.

5. The method of claim 1, wherein, the broadcast message further comprising satellite positioning information, the satellite positioning information comprising one or more of ephemeris information, a first epoch time and a second epoch time; determining relative angle information between the terminal and the spaceborne network device, comprising: determining the relative angle information between the terminal and the spaceborne network device based on the satellite positioning information and position information of the terminal; wherein the first epoch time is an epoch time corresponding to the angle information of the first beam; and the second epoch time is an epoch time corresponding to the angle information of the second beam.

6. The method of claim 1, wherein, indicating relevant information of the target beam to a spaceborne network device, comprising: sending a physical random access channel (PRACH) signal to the spaceborne network device; a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the relevant information of the target beam. 7.A beam indication method applied to a spaceborne network device, comprising: sending a broadcast message based on a first beam; the broadcast message comprising angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, for a terminal to determine a target beam corresponding to the terminal; determining the target beam based on relevant information of the target beam indicated by the terminal; wherein the target beam is a second beam used by the spaceborne network device to serve the terminal.

8. The beam indication method of claim 7, wherein, the broadcast message further comprising satellite positioning information, the satellite positioning information comprising one or more of ephemeris information, a first epoch time and a second epoch time; The first epoch time is an epoch time corresponding to angle information of the first beam; and the second epoch time is an epoch time corresponding to angle information of the second beam. 9.The beam indication method of claim 7, wherein, The terminal indicates the related information of the target beam in the following manner: The terminal sends a physical random access channel (PRACH) signal to the spaceborne network device, and a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the related information of the target beam.

10. A terminal comprising a memory, a transceiver, and a processor. The memory is configured to store a computer program. The transceiver is configured to transceive data under control of the processor. The processor is configured to read the computer program in the memory and perform the following operations: determining a target beam corresponding to the terminal based on a broadcast message received on a first beam; the broadcast message comprising angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam; indicating related information of the target beam to a spaceborne network device; The target beam is a second beam used by the spaceborne network device to serve the terminal.

11. The terminal according to claim 10, wherein Determining a target beam corresponding to the terminal based on a broadcast message received on a first beam comprises: determining relative angle information between the terminal and the spaceborne network device; determining the target beam corresponding to the terminal based on the relative angle information and the broadcast message.

12. The terminal according to claim 11, wherein, Determining a target beam corresponding to the terminal based on the relative angle information and the broadcast message comprises: determining a target quadrant region in which the target beam is located in a plurality of quadrant regions divided by a coverage area of the first beam based on a difference between the relative angle information and the angle information of the first beam; determining the target beam corresponding to the terminal based on the target quadrant region.

13. The terminal of claim 11, wherein, Determining a target beam corresponding to the terminal based on the relative angle information and the broadcast message comprises: determining a second beam closest to the relative angle information in the angle information of the at least one second beam as the target beam corresponding to the terminal.

14. The terminal of claim 10, wherein, The broadcast message further comprises satellite positioning information, and the satellite positioning information comprises one or more of ephemeris information, a first epoch time, and a second epoch time. Determining relative angle information between the terminal and the spaceborne network device comprises: determining the relative angle information between the terminal and the spaceborne network device based on the satellite positioning information and position information of the terminal; The first epoch time is an epoch time corresponding to angle information of the first beam; and the second epoch time is an epoch time corresponding to angle information of the second beam.

15. The terminal of claim 10, wherein, Indicating the related information of the target beam to the spaceborne network device comprises: sending a physical random access channel (PRACH) signal to the spaceborne network device; and a preamble index of the PRACH signal and / or a random access opportunity (RO) to which the PRACH signal belongs has a corresponding relationship with the related information of the target beam. 16.A satellite network device, comprising a memory, a transceiver, a processor; the memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; the processor is configured to read the computer program in the memory and perform the following operations: sending a broadcast message based on a first beam;The broadcast message comprises angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, which is used for the terminal to determine a target beam corresponding to the terminal; determining the target beam based on the related information of the target beam indicated by the terminal; wherein the target beam is a second beam used by the satellite network device to serve the terminal.

17. The space-borne network device of claim 16, wherein, The broadcast message further comprises satellite positioning information, and the satellite positioning information comprises one or more of ephemeris information, a first epoch time and a second epoch time; wherein the first epoch time is an epoch time corresponding to the angle information of the first beam;The second epoch time is an epoch time corresponding to the angle information of the second beam.

18. The space-borne network device of claim 16, wherein, The terminal indicates the related information of the target beam by the following way: The terminal sends a physical random access channel (PRACH) signal to the satellite network device, and the preamble index of the PRACH signal and / or the random access opportunity (RO) to which the PRACH signal belongs have a corresponding relationship with the related information of the target beam. 19.A beam indication apparatus applied to a terminal, comprising: a first determination module configured to determine a target beam corresponding to the terminal based on a broadcast message received on a first beam; The broadcast message comprises angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam; an indication module configured to indicate the related information of the target beam to a satellite network device; wherein the target beam is a second beam used by the satellite network device to serve the terminal. 20.A beam indication apparatus applied to a satellite network device, comprising: a sending module configured to send a broadcast message based on a first beam; The broadcast message comprises angle information of the first beam and / or angle information of at least one second beam corresponding to the first beam, which is used for the terminal to determine a target beam corresponding to the terminal; a second determination module configured to determine the target beam based on the related information of the target beam indicated by the terminal; wherein the target beam is a second beam used by the satellite network device to serve the terminal. 21.A non-transitory readable storage medium, the non-transitory readable storage medium stores a computer program, the computer program is used for making a processor execute the beam indication method in any one of claims 1 to 6, or execute the beam indication method in any one of claims 7 to 9.

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