A method and system for rapid access of a satellite communication terminal

Abstract

The present invention discloses a method and system for rapid access of a satellite communication terminal. The initial access process on the terminal side includes: receiving an SSB set generated by the satellite side, and setting the scanning priority of the beams to be scanned in the SSB set; selecting a plurality of beams to be scanned with the highest scanning priorities from the beams to be scanned according to the scanning priorities of the beams; scanning the plurality of beams to be scanned in sequence according to the priorities to obtain the optimal beam for the terminal uplink random access, and completing the rapid initial access on the terminal side. On the premise of ensuring the beam gain, the scanning priority of the beam is set to reduce the number of beams to be scanned by the terminal, thereby reducing the access delay, avoiding random access failure caused by a large access delay, and ensuring that the ground terminal can quickly and effectively interact with the satellite for information.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication, and particularly to a method and system for rapid access of a satellite communication terminal. Background Art

[0002] With the large-scale commercial deployment of 5G communication systems, as the next-generation mobile communication system, 6G aims to meet the social communication needs after the next decade. As a key backbone technology of 6G, the satellite communication network can be used as a supplement to terrestrial communication to form a three-dimensional communication network integrating space, air and ground, achieving seamless global coverage in areas such as high altitude, outer space, ocean, deep sea, mountainous areas, and deserts.

[0003] Satellite communication can be divided into low Earth orbit satellites (LEO), medium Earth orbit satellites (MEO), geostationary Earth orbit satellites (GEO), etc. according to the orbital altitude. The low-orbit satellite LEO has advantages such as small transmission delay, low path loss, strong frequency reuse ability, small satellite volume, and low research and development cost compared with medium and high-orbit satellites. Therefore, in recent years, with the commercial use of foreign LEO broadband satellite communication systems such as the OneWeb system of OneWeb Company and the Starlink system of SpaceX Company, as well as the demonstration and construction of domestic LEO communication systems such as "Hongyun", "Xingyun", and "Hongyan", the research and construction of communication systems based on LEO satellite constellations have entered a rapid development stage.

[0004] Currently, most satellite communication systems use multi-beam antennas. In particular, high-throughput satellite communication systems use multi-beam coverage to achieve transmission rates above the Gbps level. The area covered by the satellite is divided into multiple beam regions, which enables the satellite to perform frequency reuse, thereby improving the system capacity.

[0005] The beam pointing of the satellite generally adopts a fixed configuration. The coverage area corresponding to each beam will move simultaneously as the satellite moves, and the moving speed of the ground terminal can be ignored compared with the moving speed of the LEO satellite, resulting in frequent beam switching for fixed or mobile ground terminals. For LEO systems, low-orbit satellites have a very high moving speed, which can reach 7 km / s to 8 km / s, causing multiple beam switches for terminal users during service transmission.

[0006] The typical beam switching period of LEO satellite communication systems is in the order of seconds. In this case, if the switching of the service beam cannot be completed in time, it will lead to the interruption of communication services, and frequent beam switching will bring a large amount of signaling overhead. Summary of the Invention

[0007] The technical problem to be solved by the present invention is how to shorten the time delay of the terminal accessing the network. The purpose is to provide a fast access method for satellite communication terminals. In a communication system that integrates 5G and satellite communication, on the premise of ensuring beam gain, by setting the scanning priority of the beam, the number of beams to be scanned by the terminal is reduced, thereby reducing the access time delay, avoiding random access failure caused by a large access time delay, and ensuring that the ground terminal can quickly and effectively interact with the satellite for information.

[0008] The present invention is realized through the following technical solutions:

[0009] A fast access method for satellite communication terminals, the initial access process on the terminal side includes:

[0010] S1. Receive the SSB set generated by the satellite side, and set the scanning priority of the beam for the beams to be scanned in the SSB set;

[0011] S2. According to the scanning priority of the beam, select several beams to be scanned with the highest scanning priority from the beams to be scanned;

[0012] S3. Scan the several beams to be scanned in sequence according to the priority to obtain the optimal beam for the terminal uplink random access, and complete the fast initial access on the terminal side.

[0013] In a satellite communication system, when the ground terminal accesses the system, usually the ground terminal needs to switch the beam according to the movement of the satellite. If the service beam cannot be switched within the beam switching period, it will lead to the interruption of communication services. When the terminal obtains the optimal beam for subsequent uplink random access through SSB scanning, random access failure may occur due to a large access time delay. Since the acquisition time delay of the optimal random access beam mainly depends on the number of beams on the terminal side and the transmission time delay, and the acquisition of this beam should ensure real-time as much as possible, otherwise it may occur that the actual optimal beam has changed at the moment when the optimal beam is obtained, resulting in access failure on the terminal side. And in order to ensure high beam gain, narrow beams are usually used on the terminal side, and the use of narrow beams increases the number of beams within the fixed scanning range on the terminal side, thereby increasing the access time delay. Therefore, this solution reduces the beams to be scanned by setting the scanning priority of the beam on the terminal side on the premise of ensuring beam gain, quickly obtains the optimal beam for subsequent uplink random access, thereby reducing the initial access time delay of the terminal; avoiding random access failure caused by a large access time delay, and ensuring that the ground terminal can quickly and effectively interact with the satellite for information.

[0014] Furthermore, in order to further reduce the entire initial access beam scanning delay, when the SSB set is generated on the satellite side, each SSB is scanned multiple times, including scanning the PSS, SSS, and PBCH in the SSB using different beams. In this way, multiple beam scans of an SSB on the satellite side are combined with reducing the beams that need to be scanned on the terminal side, thereby reducing the beam scanning delay from both the satellite side and the terminal side, thereby shortening the delay in terminal access to the network and ensuring that the ground terminal can quickly and effectively randomly access the communication system to interact with the satellite.

[0015] Furthermore, when setting the scanning priority of the beam in S1, the scanning priority may be set in a manner including: setting it before scanning the beam, or setting it by real-time calculation during the beam scanning process.

[0016] Furthermore, before scanning the beam, the scanning priority of the beam is set according to historical information or auxiliary information, the historical information includes the optimal beam information of the last access, and the auxiliary information includes ephemeris information and terminal positioning information.

[0017] Furthermore, the process of setting the scanning priority of the wave velocity by real-time calculation during the scanning process is:

[0018] Starting from the first beam in the beams to be scanned, based on the scan and receive information of the first beam received, the scan and receive information includes receive energy / power, beam ID, beam spatial pointing, etc., the ID of the next beam to be scanned is predicted, and during the prediction, the beam to be scanned next time is ensured to gradually approach the optimal beam, and the second beam to be scanned is obtained;

[0019] Combine the scanning and receiving information of the first beam and the second beam to be scanned, predict the ID of the next beam to be scanned, and obtain the third beam to be scanned;

[0020] Combine the scanning and receiving information of the first beam, the second beam to be scanned, and the third beam to be scanned, predict the ID of the next beam to be scanned, and obtain the fourth beam to be scanned;

[0021] Repeat the above process, predict the next beam ID to be scanned based on the scanning and receiving information of the previously determined beam to be scanned, and determine the next beam to be scanned until the optimal beam is obtained, thereby realizing the dynamic setting of the scanning priority of the beam.

[0022] Further, in S2, several to-be-scanned beams with the top scanning priorities are selected. If there are L such to-be-scanned beams, L can be configured as a fixed value, or a threshold is set according to the received beam signal energy intensity, and the beams that meet the threshold condition are selected to determine L.

[0023] The present invention correspondingly provides a satellite communication terminal fast access system, including a satellite transmitting device and a terminal receiving device. The terminal receiving device includes a priority setting module, a beam selection module, and a beam scanning module, where,

[0024] The satellite transmitting device is used to generate SSBs on the satellite side and send the SSB set to the terminal side;

[0025] The priority setting module sets the scanning priorities of the to-be-scanned beams in the SSB set according to the received SSB set;

[0026] The beam selection module selects several to-be-scanned beams with the top scanning priorities from the to-be-scanned beams according to the scanning priorities of the beams;

[0027] The beam scanning module sequentially scans the several to-be-scanned beams according to the priorities to obtain the optimal beam for uplink random access, and completes the fast initial access of the terminal side to the satellite side.

[0028] Further, when the satellite transmitting device generates the SSB set, different beams are used to scan the PSS, SSS, and PBCH in each SSB.

[0029] Further, the setting method of the scanning priority includes: setting the scanning priority of the beam according to historical information or auxiliary information before scanning the beam. The historical information includes the optimal beam information of the last access, and the auxiliary information includes ephemeris information and terminal positioning information; or during the beam scanning process, predicting the beam ID to be scanned next according to the received beam scanning and reception information (such as received energy / power, beam ID, beam spatial pointing, etc.). During the entire prediction process, it is ensured that the beam to be scanned next gradually approaches the optimal beam, so as to dynamically configure the scanning priority of the beam.

[0030] Further, several to-be-scanned beams with the top scanning priorities are selected. If there are L such to-be-scanned beams, L can be configured as a fixed value, or a threshold is set according to the received beam signal energy intensity, and the beams that meet the threshold condition are selected to determine L.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] 1. A method and system for rapid access of a satellite communication terminal. On the terminal side, while ensuring beam gain, by setting the scanning priority of the beam, the number of beams to be scanned by the terminal is reduced, thereby reducing the access delay, shortening the delay for the terminal to access the network, avoiding random access failure caused by a large access delay, and ensuring that the ground terminal can quickly and effectively interact with the satellite for information.

[0033] 2. A method and system for rapid access of a satellite communication terminal. On the satellite side, by performing multiple scans on one SSB, the overall initial access beam scanning delay is reduced. For example, different beams are used to scan the PSS, SSS, and PBCH in each SSB. While reducing the overall initial access beam scanning delay on the satellite side, the initial access delay of the terminal is also reduced on the terminal side. It can effectively reduce the scanning beams required for the terminal during initial access in satellite communication, thereby reducing the delay of the entire access beam acquisition process and enabling the terminal to quickly and effectively use the optimal beam for subsequent random access. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0035] Figure 1 is a schematic diagram of LEO multi-beam coverage in the prior art;

[0036] Figure 2 is the SSB configuration and the corresponding beam scanning process in the prior art;

[0037] Figure 3 is the initial access beam scanning process of the satellite and the ground terminal in the prior art;

[0038] Figure 4 is a schematic diagram of the method flow for rapid access in an embodiment of the present invention;

[0039] Figure 5 is a schematic diagram of the method flow for rapid access in another embodiment of the present invention;

[0040] Figure 6 is a comparison diagram before and after using the beam scanning priority to determine the optimal beam in an embodiment of the present invention;

[0041] Figure 7 is the process of setting the beam scanning priority on the terminal side of the present invention;

[0042] Figure 8 is the beam scanning distribution diagram in each SSB on the satellite side of the present invention;

[0043] Figure 9 This invention combinesFigure 7 and Figure 8 process, a schematic diagram of the process of the terminal accessing the system. Specific implementation manners

[0044] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0045] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that: it is not necessary to adopt these specific details to implement the present invention. In other instances, well-known structures, circuits, materials or methods are not specifically described in order to avoid obscuring the present invention.

[0046] Currently, most satellite communication systems adopt multi-beam antennas, such as Figure 1 shown. In particular, high-throughput satellite communication systems adopt multi-beam coverage to achieve transmission rates above the Gbps level. The beam pointing of the satellite generally adopts a fixed configuration. The coverage area corresponding to each beam will move simultaneously as the satellite moves, and the moving speed of the ground terminal can be ignored relative to the moving speed of the LEO satellite, resulting in frequent beam switching for fixed or mobile ground terminals. The typical beam switching period of the LEO satellite communication system is in the order of seconds. In this case, if the switching of the serving beam cannot be completed in time, it will lead to the interruption of communication services, and frequent beam switching will bring a large amount of signaling overhead.

[0047] In the current standards and protocols related to the integration of 5G and satellite communication, such as 3GPP NTN, Sat5G and other related protocols, it is recommended to reuse the beam management process based on the 3GPP Rel-15 version as much as possible to achieve beam scanning for satellite communication; in the beam management process of the 3GPP Rel-15 version, the initial access part is the focus of beam scanning and management. This part mainly realizes the initial access process of the terminal UE through beam-bearing SSB (SS / PBCH block) signals for scanning. The typical SSB configuration and the corresponding beam scanning process are as Figure 2 shown. In each SSB set, it contains a complete beam scanning on the satellite side. Each SSB in the SSB set contains the primary synchronization signal PSS, the secondary synchronization signal SSS and the broadcast channel PBCH. The terminal side can realize the downlink synchronization process of the cell through the detection of PSS and SSS and the reception of PBCH.

[0048] Each SSB is transmitted by being carried on a physical beam, that is, the PSS, SSS, and PBCH contained in each SSB are scanned by beam polling with the same physical ID until all SSB beam scans are completed. In an SSB set, the maximum configurable number of SSBs is N = 64, and the scanning and transmission period of the SSB set can be configured as T ssb =[5ms, 10ms, 20ms, 40ms, 80ms, 160ms], and the default configuration is T ssb = 20ms, Figure 2 The SSB scan with a default configuration period of 20ms is shown in

[0049] Although the scan period of the SSB set can be configured, this configuration message needs to be indicated and transmitted through SIB1. Therefore, when the terminal side performs initial access and has not received the SIB1 message, the default 20ms period is actually used for SSB search. And during the actual reception process, in addition to performing the scan of the satellite-side SSB required by the protocol, the terminal side also needs to perform local beam scanning to determine the best receiving beam locally, as shown in Figure 3 shown.

[0050] On the one hand, in LEO / MEO satellite communication, different from ground communication, due to the long distance between the satellite and the ground terminal, the transmission delay is very large. For example, for a LEO satellite with an orbital altitude of 1500km, the one-way transmission delay can reach about 13ms, while for a MEO satellite, the transmission delay can reach about 50ms. As shown in Table 1, the transmission delays from some low and medium orbit satellites to ground devices are listed.

[0051] Table 1 Transmission Delays from Low and Medium Orbit Satellites to Ground Devices

[0052]

[0053] On the other hand, if the terminal obtains the optimal beam for subsequent uplink random access through SSB scanning, the duration to complete the entire SSB beam scan is:

[0054] T 随机接入最优波束获取时延 = 20ms * M + one-way transmission delay

[0055] It can be seen that the acquisition delay of the random access optimal beam mainly depends on the number of terminal-side beams and the transmission delay, and the acquisition of this beam should ensure real-time as much as possible. Otherwise, it may occur that at the moment when the optimal beam is obtained, the actual optimal beam has already changed, resulting in access failure on the terminal side.

[0056] Compared with terrestrial communication, satellite communication has a larger link loss during transmission, especially in the high-frequency band (such as Ka / Ku band). Therefore, narrow beams are usually adopted on the terminal side to ensure high beam gain, and the use of narrow beams increases the number of beams within the fixed scanning range on the terminal side.

[0057] As shown in Table 2, the optimal access beam acquisition delays corresponding to the number of beams of some different terminals are listed. It can be seen that when the number of terminal beams is large, the optimal beam acquisition will reach a delay of more than one second.

[0058] Table 2 Optimal Access Beam Acquisition Delays for Low and Medium Earth Orbit Satellites

[0059]

[0060] Embodiment 1

[0061] Aiming at the above-mentioned shortcomings in the prior art, as Figure 4 shown, Embodiment 1 of the present invention provides a satellite communication terminal fast access method. The initial access process on the terminal side includes:

[0062] S1. Receive the SSB set generated by the satellite side, and set the scanning priority of the beams to be scanned in the SSB set;

[0063] S2. Select several beams to be scanned with the highest scanning priorities from the beams to be scanned according to the scanning priorities of the beams;

[0064] S3. Scan the several beams to be scanned in order of priority to obtain the optimal beam for the terminal uplink random access, and complete the fast initial access on the terminal side.

[0065] Specifically, when setting the scanning priority of the beams in S1, the setting methods of the scanning priority include:

[0066] (1) Set according to historical information before scanning the beams, such as the optimal beam information of the previous access;

[0067] (2) Set according to other auxiliary information before scanning the beams, such as ephemeris information, terminal positioning information, etc.

[0068] (3) Set by real-time calculation according to the signal energy intensity received during the beam scanning process.

[0069] In a specific implementation process, taking the form that the terminal has M beams as an example, the process of setting the scanning priority of the wave speed by real-time calculation during the scanning process is:

[0070] Starting from the first beam in the beam to be scanned, based on the received scanning and reception information of the first beam (such as received energy / power, beam ID, beam spatial pointing, etc.), predict the ID of the next beam to be scanned. When predicting, ensure that the beam scanned next gradually approaches the optimal beam to obtain the second beam to be scanned;

[0071] Combining the scanning and reception information (such as received energy / power, beam ID, beam spatial pointing, etc.) of the first beam and the second beam to be scanned, predict the ID of the next beam to be scanned to obtain the third beam to be scanned;

[0072] Combining the scanning and reception information (such as received energy / power, beam ID, beam spatial pointing, etc.) of the first beam, the second beam to be scanned, and the third beam to be scanned, predict the ID of the next beam to be scanned to obtain the fourth beam to be scanned;

[0073] Repeat the above process. Based on the scanning and reception information (such as received energy / power, beam ID, beam spatial pointing, etc.) of the beams to be scanned that have been determined previously, predict the ID of the next beam to be scanned and determine the next beam to be scanned until the optimal beam is obtained. During the entire prediction process, ensure that the beam scanned next gradually approaches the optimal beam, so that the optimal beam of the terminal can be obtained without scanning all the terminal beams, thereby dynamically configuring the priority of beam scanning.

[0074] Such as Figure 7 As shown, during the above process of setting the scanning priority of the wave velocity, according to the received signal strength in the scanning and reception information, based on the sum of the signal energy intensities of the beams to be scanned that have been determined previously, predict the ID of the next beam to be scanned and determine the next beam to be scanned until the optimal beam is obtained.

[0075] Then, by only selecting L (L < M) beams out of the M beams for scanning, the entire beam scanning delay is shortened to L / M (L < M) of the original, achieving the purpose of reducing the beam scanning delay. The determination of L can be configured as a fixed value, or can be configured according to the scenario requirements, or a threshold can be set according to the received beam signal energy intensity, and the beams that meet the threshold conditions are selected to determine L, where i, k, and M are arbitrary integers.

[0076] Such as Figure 6As shown in the figure, if the prior art is adopted to scan the beams to be scanned sequentially, all the beams to be scanned are traversed, and finally the optimal beam is determined. In this way, the scanning delay of the terminal is greatly increased, resulting in the situation that the actual optimal beam may have changed at the moment when the optimal beam is obtained, thus causing the access failure on the terminal side. When the method of this embodiment is used to scan the beams to be scanned, a certain number of beams are selected for scanning according to the set priority order. As can be seen from the figure, compared with the prior art, the number of beams to be scanned in this embodiment is greatly reduced, and the optimal beam can be obtained even when the number of scanned beams is reduced, reducing the beam scanning delay and avoiding the random access failure of the terminal due to the large access delay.

[0077] Embodiment 2

[0078] As Figure 5 shown, a method for rapid access of a satellite communication terminal in Embodiment 2 includes the following processes:

[0079] 1. The satellite side generates an SSB set and performs multiple scans on each SSB. For example, different beams are used to scan the PSS, SSS, and PBCH in the SSB.

[0080] 2. The terminal receives the SSB set generated by the satellite side and performs multiple switching scans on the beams to be scanned in the SSB set; obtains the optimal beam for the terminal's uplink random access, and completes the rapid initial access on the terminal side.

[0081] When the satellite side performs multiple scans on each SSB, as Figure 8 shown, in this way, combining multiple beam scans of an SSB on the satellite side with reducing the number of beams to be scanned on the terminal side, in each SSB, different beams are configured for scanning the 4 symbols occupied by the PSS, SSS, and PBCH, thereby increasing the number of beams that can be scanned in each SSB set, and the terminal side can perform 4 beam switching scans in each SSB set, so that the delay of the entire beam scan on the terminal can be shortened by 4 times.

[0082] Embodiment 3

[0083] As Figure 9 shown, on the basis of Embodiment 1 and Embodiment 2, in Embodiment 3, the method of Embodiment 1 is adopted on the terminal side to reduce the beams to be scanned by the terminal by setting the scanning priority of the beams, thereby reducing the access delay. At the same time, the method of Embodiment 2 is adopted on the satellite side to perform multiple scans on an SSB to reduce the entire initial access beam scanning delay. Then the delay of the entire terminal initial access to obtain the optimal beam will be shortened to L / (4*M) of the original, enabling the terminal to quickly and effectively use this optimal beam for subsequent random access. The specific method process will not be elaborated here.

[0084] Example 4

[0085] Example 4 of the present invention provides a satellite communication terminal fast access system, including a satellite transmitting device and a terminal receiving device. The terminal receiving device includes a priority setting module, a beam selection module, and a beam scanning module. Among them, the satellite transmitting device is used to generate SSB on the satellite side and send the SSB set to the terminal side; the priority setting module sets the scanning priority of the beams to be scanned in the SSB set according to the received SSB set; the beam selection module selects several beams to be scanned with the highest scanning priority from the beams to be scanned according to the scanning priority of the beams; the beam scanning module scans several beams to be scanned in order of priority to obtain the optimal beam for uplink random access, and completes the fast initial access of the terminal side to the satellite side.

[0086] In one implementation, when the satellite transmitting device generates the SSB set, different beams are used to scan the PSS, SSS, and PBCH in each SSB.

[0087] Specifically, the setting method of the scanning priority includes: setting the scanning priority of the beam according to historical information or auxiliary information before scanning the beam. The historical information includes the optimal beam information of the last access, and the auxiliary information includes ephemeris information and terminal positioning information; or predicting the beam ID to be scanned next according to the received beam signal energy intensity during the beam scanning process. During the whole prediction process, it is ensured that the beam to be scanned next gradually approaches the optimal beam, so as to dynamically configure the scanning priority of the beam. When selecting several beams to be scanned with the highest scanning priority, if the several beams to be scanned are L, L can be configured as a fixed value, or a threshold is set according to the received beam signal energy intensity, and the beam that meets the threshold condition is selected to determine L.

[0088] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0089] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in the Figure 1 one or more of the flows and / or blocks Figure 1 one or more of the blocks.

[0090] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in the Figure 1 one or more of the flows and / or blocks Figure 1 one or more of the blocks.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the Figure 1 one or more of the flows and / or blocks Figure 1 one or more of the blocks.

[0092] Those of ordinary skill in the art can understand that all or part of the steps in implementing the above facts and methods can be completed by instructing relevant hardware through a program. The involved program or the described program can be stored in a computer-readable storage medium. When the program is executed, it includes the following steps: At this time, the corresponding method steps are introduced. The storage medium can be ROM / RAM, magnetic disks, optical discs, etc.

[0093] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for rapid access of a satellite communication terminal, characterized in that, the initial access process on the terminal side includes: S1. Receive the SSB set generated on the satellite side, and set the scanning priority of the beams to be scanned in the SSB set; When setting the scanning priority of the beams in S1, the setting method of the scanning priority includes: setting it through real-time calculation during the beam scanning process; The process of setting the scanning priority of the beams through real-time calculation during the scanning process is: Starting from the first beam in the beams to be scanned, according to the scanning and receiving information of the first beam received, the scanning and receiving information includes received energy / power, beam ID, and beam spatial pointing, predict the beam ID of the next beam to be scanned, and ensure that the beam to be scanned next gradually approaches the optimal beam during the prediction, so as to obtain the second beam to be scanned; Combining the scanning and receiving information of the first beam and the second beam to be scanned, predict the beam ID of the next beam to be scanned, and obtain the third beam to be scanned; Combining the scanning and receiving information of the first beam, the second beam to be scanned, and the third beam to be scanned, predict the beam ID of the next beam to be scanned, and obtain the fourth beam to be scanned; Repeat the above process, according to the scanning and receiving information of the beams to be scanned that have been determined previously, predict the beam ID of the next beam to be scanned, and determine the next beam to be scanned until the optimal beam is obtained, thereby realizing the dynamic setting of the scanning priority of the beams; S2. According to the scanning priority of the beams, select several beams to be scanned with the highest scanning priority from the beams to be scanned; S3. Scan the several beams to be scanned in order according to the priority, obtain the optimal beam for the terminal uplink random access, and complete the rapid initial access on the terminal side.

2. The method for rapid access of a satellite communication terminal according to claim 1, characterized in that, when the satellite side generates the SSB set, each SSB is scanned multiple times, including scanning the PSS, SSS, and PBCH in the SSB with different beams.

3. The method for rapid access of a satellite communication terminal according to claim 1, characterized in that, When selecting several beams to be scanned with the highest scanning priority in S2, if the several beams to be scanned are L, then L can be configured as a fixed value, or a threshold is set according to the received beam signal energy intensity, and L is determined by selecting the beams that meet the threshold conditions.

4. A rapid access system for a satellite communication terminal, characterized in that, it includes a satellite transmitting device and a terminal receiving device, and the terminal receiving device includes a priority setting module, a beam selection module, and a beam scanning module, wherein, the satellite transmitting device is used to generate the SSB on the satellite side and send the SSB set to the terminal side; the priority setting module sets the scanning priority of the beams to be scanned in the SSB set according to the received SSB set; The setting method of the scanning priority includes: setting it through real-time calculation during the beam scanning process; The process of setting the scanning priority of the beam through real-time calculation during the scanning process is as follows: Starting from the first beam among the beams to be scanned, based on the scanning and reception information of the first received beam, where the scanning and reception information includes received energy / power, beam ID, and beam spatial pointing, predict the ID of the next beam to be scanned. During the prediction, ensure that the beam to be scanned next gradually approaches the optimal beam, and obtain the second beam to be scanned; Combining the scanning and reception information of the first beam and the second beam to be scanned, predict the ID of the next beam to be scanned, and obtain the third beam to be scanned; Combining the scanning and reception information of the first beam, the second beam to be scanned, and the third beam to be scanned, predict the ID of the next beam to be scanned, and obtain the fourth beam to be scanned; Repeat the above process. According to the scanning and reception information of the beams to be scanned that have been determined previously, predict the ID of the next beam to be scanned, and determine the next beam to be scanned until the optimal beam is obtained, thereby realizing the dynamic setting of the scanning priority of the beam; The beam selection module selects a number of beams to be scanned with higher scanning priorities from the beams to be scanned; The beam scanning module scans the number of beams to be scanned in order of priority, obtains the optimal beam for uplink random access, and completes the fast initial access of the terminal side to the satellite side.

5. A satellite communication terminal fast access system according to claim 4, characterized in that, When the satellite transmitting device generates the SSB set, different beams are used to scan the PSS, SSS, and PBCH in each SSB.

6. A satellite communication terminal fast access system according to claim 4, characterized in that, Select a number of beams to be scanned with higher scanning priorities. If the number of beams to be scanned is L, then L can be configured as a fixed value, or a threshold can be set according to the received beam signal energy intensity, and the beam that meets the threshold condition is selected to determine L.

Images