Low earth orbit satellite handover prediction accuracy determination method and device

Abstract

The application provides a low-orbit satellite switching prediction accuracy judgment method and device, the method comprises the following steps: step S1, initialization when first running; step S2, any terminal access, prediction based on ephemeris information and terminal position, and the measurement configuration is sent to the terminal according to the prediction result; step S3, the terminal carries out measurement, and the measurement report is periodically reported; step S4, the base station compares whether the beam actually covering the terminal is consistent with the beam theoretically covering the terminal, and obtains the prediction result accuracy; step S5, the base station determines and updates the comprehensive accuracy of the prediction result according to the number of measurement reports reported by all terminals and the prediction result accuracy, compares the size of the comprehensive accuracy and the first threshold, to determine whether the current prediction overall is reliable; step S6, if the measurement report reporting has not ended, enter step S4. The application can judge whether the prediction result is accurate enough, provide accurate basis for subsequent beam switching, thereby improve the success rate of switching.

Description

Technical Field

[0001] This invention relates to a method and apparatus for judging the accuracy of low-Earth orbit satellite handover prediction. Background Technology

[0002] Low Earth Orbit (LEO) satellite communication networks provide communication services through constellations of numerous LEO satellites. However, because these satellites are all deployed in space and have a relatively high angular velocity relative to Earth, they can only provide coverage to terminals on the ground for a limited time. Generally, the coverage time of a single LEO satellite for a fixed terminal on the ground is short, and the terminal's communication time often exceeds the visible time of that satellite. In this situation, to ensure uninterrupted communication, the terminal needs to continuously switch to other visible satellites to continue its communication process. Furthermore, considering the motion characteristics of satellites, the topology of the satellite network varies at different times, necessitating continuous switching between visible and invisible satellites to maintain communication continuity. Therefore, handover technology is a crucial technology in satellite communication networks; a well-designed handover strategy can ensure seamless switching for terminals to obtain continuous communication services.

[0003] Existing handover solutions rely on satellite ephemeris information for orbit prediction. This predicts the terminal's location at different times and the coverage relationship between each satellite beam, allowing for advance awareness of impending handover events and preparation for the handover, thus improving handover stability. However, this approach faces several challenges. Missing or inaccurate ground terminal positioning information and satellite ephemeris information can lead to deviations in this ephemeris- and orbit-based prediction method, ultimately affecting the handover success rate. Summary of the Invention

[0004] The purpose of this invention is to propose a method and apparatus for judging the accuracy of low-Earth orbit satellite handover prediction. By comparing the prediction results with actual measurement data, the accuracy of the prediction results can be judged to provide a sufficiently accurate basis for subsequent beam switching, thereby improving the success rate of handover.

[0005] This invention is achieved through the following technical solution:

[0006] A method for judging the accuracy of low-Earth orbit satellite handover prediction includes the following steps:

[0007] Step S1: Initialize the low-Earth orbit satellite communication system during its first run to obtain sufficient measurement values;

[0008] Step S2: When any terminal uei accesses the satellite, the base station makes a prediction based on the satellite's ephemeris information and the location reported by the terminal uei, and sends the measurement configuration to the terminal uei according to the prediction result. The prediction result includes the beam that the terminal uei theoretically covers and the target beam that may be tangential.

[0009] Step S3: The terminal uei measures the signal strength of the source beam and adjacent beams when it is near the edge of the source beam, according to the measurement configuration sent by the base station, and periodically reports the measurement report to the base station.

[0010] Step S4: The base station obtains the beam that actually covers the terminal's UEI at the reported time based on the measurement report, and obtains the beam that theoretically covers the terminal's UEI at the reported time based on the prediction result. It then compares whether the two beams are consistent at the reported time to obtain the prediction accuracy (DOA) corresponding to the terminal's UEI. uei ;

[0011] Step S5: The base station generates a first type of weight based on the number of measurement reports reported by all terminals, generates a second type of weight based on the prediction accuracy of all terminals, and performs a weighted sum of the prediction accuracy of all terminals based on the first and second type of weights to determine and update the overall prediction accuracy (DOA) of all terminals currently accessing the base station. sys_reliability , when DOA sys_reliability If the value exceeds the set first threshold, the base station is considered to have reliable predictions for all terminals as a whole; otherwise, the predictions are considered to be unreliable as a whole.

[0012] Step S6: If the measurement report reporting has not yet ended, proceed to step S4 to continue to analyze the overall accuracy (DOA) of the current prediction results of the base station. sys_reliability Update; otherwise, stop evaluating the overall accuracy (DOA) of the prediction results. sys_reliability Update.

[0013] Furthermore, step S1 includes the following steps:

[0014] Step S11: Before the terminal accesses the satellite, the overall accuracy (DOA) of the prediction results is calculated. sys_reliability The value is set to 1;

[0015] Step S12: When any terminal accesses the satellite, the satellite performs a handover prediction based on the satellite's ephemeris information and the location information reported by the terminal accessing the satellite, and sends a measurement configuration to the terminal according to the prediction result. The prediction result includes the beam that the terminal theoretically covers and the target beam that may be tangential.

[0016] Step S13: The terminal measures the signal strength of the source beam and the adjacent beam when it is near the edge of the source beam, according to the measurement configuration sent by the base station, and periodically reports the measurement report to the base station.

[0017] Step S14: The base station obtains and stores the measurement values ​​at the reporting time based on the measurement report, without updating the overall accuracy (DOA) of the prediction results. sys_reliability ;

[0018] Step S15: When the sum of the measurement values ​​reported by all terminals accessing the satellite exceeds the preset measurement value threshold, proceed to step S2.

[0019] Furthermore, in step S2, the base station analyzes the beams that theoretically cover the terminal uei and the possible target beams that may be tangentially oriented to it in the next period of time based on the satellite ephemeris information and the location reported by the terminal uei, and stores the times when the terminal uei enters and leaves each beam, as well as the times when the terminal uei tangentially oriented to each possible target beam.

[0020] Furthermore, the measurement configuration includes measurement start time, measurement object, measurement content, and measurement period. The measurement time starts when the terminal is near the edge of the predicted source beam and ends when it receives a handover instruction sent by the base station. The measurement object is the predicted source beam and target beam. The measurement content is signal strength. The measurement period is a multiple of the beam reference signal broadcast period. The reporting period of the measurement report is greater than or equal to the measurement period.

[0021] Furthermore, in step S4, the base station obtains and stores the signal strength measurement values ​​of each measured beam at each reporting time based on the measurement reports reported at each time. When the signal strength of a certain beam at a certain reporting time is greater than the second threshold, it is determined that the terminal is covered by the beam at that reporting time.

[0022] Furthermore, in step S4, the prediction accuracy (DOA) of the terminal uei is calculated according to the formula. uei : Where N is the number of signal strength measurements currently recorded. This represents the coverage consistency results of the source beam at the corresponding time points for each signal strength measurement. This represents the coverage consistency result of the target beam at the time corresponding to each signal strength measurement value.

[0023] Furthermore, the coverage consistency results of the source beam At the time corresponding to each signal strength measurement value, when the base station predicts that the terminal is covered by the source beam, otherwise, When the measurement report determines that the terminal is covered by the source beam, otherwise, The coverage consistency result of the target beam At the time corresponding to each signal strength measurement value, when the base station predicts that the terminal is covered by the source beam, otherwise, When the measurement report determines that the terminal is covered by the source beam, otherwise,

[0024] Furthermore, in step S5, the base station calculates according to the formula... Determine and update the overall accuracy (DOA) of prediction results for all terminals currently accessing the base station. sys_reliability ,in, For the first type of weight, R uei For the second type of weight, when DOA uei When R is greater than the set third threshold, uei M is 1, M is the number of terminals currently accessing the satellite, and N is the number of measurement reports currently recorded. max This is the preset maximum number of recorded measurement reports.

[0025] Furthermore, in step S5, when the base station's overall prediction for all terminals is reliable, if the prediction accuracy (DOA) of a certain terminal's uei is... uei If the value is not greater than the third threshold, then the location information of the terminal is determined to be incorrect.

[0026] This invention is also achieved through the following technical solutions:

[0027] A device for judging the accuracy of low-Earth orbit satellite handover prediction includes a base station, a transceiver unit, and a terminal. The base station includes a processor, which is connected to the terminal through the transceiver unit. The processor includes:

[0028] The module is initialized during the first operation of the low-Earth orbit satellite communication system to obtain sufficient measurement values.

[0029] When any terminal UEI accesses a satellite, it makes a prediction based on the satellite's ephemeris information and the position reported by the terminal UEI, and sends a measurement configuration module to the terminal UEI according to the prediction result. The prediction result includes the beam that the terminal UEI theoretically covers and the target beam that may be tangential.

[0030] Based on the measurement report, obtain the beam that actually covers the terminal's UEI at the reported time. Based on the prediction results, obtain the beam that theoretically covers the terminal's UEI at the corresponding time. Compare whether the two beams are consistent at the corresponding time to obtain the prediction accuracy (DOA) for that terminal's UEI. uei The module;

[0031] Before the measurement report reporting is completed, a first type of weight is generated based on the number of measurement reports reported by all terminals, and a second type of weight is generated based on the prediction accuracy of all terminals. The prediction accuracy of all terminals is then weighted and summed according to the first and second type of weights to determine and update the overall prediction accuracy (DOA) of all terminals currently accessing the base station. sys_reliability The module, which is in DOA sys_reliability If the value exceeds the set first threshold, the base station is considered to have reliable predictions for all terminals as a whole; otherwise, the predictions are considered to be unreliable as a whole.

[0032] According to the measurement configuration sent by the base station, the terminal measures the signal strength of the source beam and adjacent beams when it is near the edge of the source beam, and periodically reports the measurement report to the base station.

[0033] The present invention has the following beneficial effects:

[0034] 1. When a terminal accesses a satellite, the base station first performs a prediction to obtain prediction results including the theoretically covering beam and the target beam. Based on the prediction results, the base station sends a measurement configuration to the terminal. The terminal then performs measurements according to the measurement configuration and periodically reports measurement reports to the base station. The base station obtains the beam actually covering the terminal at the time of the report based on the measurement reports and compares whether the theoretically covering beam and the actual covering beam are consistent, thereby obtaining the prediction accuracy of the terminal. Then, based on the measurement reports reported by all terminals and the prediction accuracy of all terminals, the base station determines and updates the overall prediction accuracy of all terminals currently accessing the satellite. Based on this overall prediction accuracy, the base station determines whether the overall prediction of all terminals is reliable. This allows the base station to determine whether the prediction results based on ephemeris and location information are accurate enough. This judgment is used as the basis for subsequent beam switching to avoid switching failures due to deviations in location or ephemeris information, effectively improving the success rate of beam switching and thus improving communication quality. Attached Figure Description

[0035] The present invention will now be described in further detail with reference to the accompanying drawings.

[0036] Figure 1 This is a flowchart of the present invention.

[0037] Figure 2 This is a schematic diagram showing the measurement time points and measurement reporting time points of the terminal. Detailed Implementation

[0038] like Figure 1 As shown, the method for judging the accuracy of low-Earth orbit satellite handover prediction includes the following steps:

[0039] Step S1: Initialize the low-Earth orbit satellite communication system during its first operation to obtain sufficient measurement values. This includes the following steps:

[0040] Step S11: Before the terminal accesses the satellite, the overall accuracy (DOA) of the prediction results is calculated. sys_reliability The value is set to 1;

[0041] Step S12: When any terminal accesses the satellite, the satellite performs a handover prediction based on the satellite's ephemeris information and the location information reported by the terminal accessing the satellite, and sends a measurement configuration to the terminal according to the prediction result. The prediction result includes the beam that the terminal theoretically covers and the target beam that may be tangential.

[0042] Step S13: The terminal measures the signal strength of the source beam and the adjacent beam when it is near the edge of the source beam, according to the measurement configuration sent by the base station, and periodically reports the measurement report to the base station.

[0043] Step S14: The base station obtains and stores the measurement values ​​at the reporting time based on the measurement report, without updating the overall accuracy (DOA) of the prediction results. sys_reliability The measurement includes the signal strength of the source beam and the signal strength of the adjacent beam;

[0044] Step S15: When the sum of the measured values ​​reported by all terminals accessing the satellite exceeds the preset measured value threshold N... max Then proceed to step S2;

[0045] When the satellite is first launched and the terminal first accesses the satellite, the base station lacks the information reported by the terminal and cannot directly verify the accuracy. After the terminal starts reporting measurement reports, relying on the measurement values ​​of only one or two terminals to judge the accuracy is also prone to errors. Therefore, it is necessary to wait for the base station to obtain a sufficient number of measurement values ​​before it can start to judge the accuracy. This is to ensure the reliability of the accuracy judgment, which is the purpose of the initialization step.

[0046] Step S2: When any terminal uei accesses the satellite, the base station analyzes the beams that theoretically cover the terminal uei and the possible target beams that may be tangentially oriented to it in the next period of time based on the satellite's ephemeris information and the location reported by the terminal uei. The base station stores the time when the terminal uei enters and leaves each beam, as well as the time when the terminal uei tangentially oriented to each possible target beam. The base station then sends the measurement configuration to the terminal uei based on the prediction results.

[0047] Table 1 shows the times when terminal uei enters the beam (e.g., t) stored by the base station. Bm1_Arrive (the time of entering beam 1) and the time of leaving each beam (e.g., t) Bm1_Deport(The time of leaving beam 1) The table can be used to obtain the coverage relationship between each beam and the terminal uei position (i.e., when the terminal is covered by which beam);

[0048] Table 1

[0049] Terminal ID Beam 1 Coverage Time Beam 2 coverage time Beam 3 Coverage Time <![CDATA[ue i ]]> <![CDATA[t Bm1_Arrive -t Bm1_Deport ]]> <![CDATA[t Bm2_Arrive -t Bm2_Deport ]]> <![CDATA[t Bm3_Arrive -t Bm3_Deport ]]>

[0050] Table 2

[0051] Terminal ID Predicting the timing of tangential beam 2 Predicting the timing of tangential beam 3 <![CDATA[ue i ]]> <![CDATA[t H_Predict 1-2 ]]> <![CDATA[t H_Predict 2-3 ]]>

[0052] Table 2 shows the times when the terminal uei is tethered to each beam stored by the base station. In Table 1 and Table 2, beam 1 is the source beam, that is, the beam currently providing services to the terminal uei, and beams 2 and 3 are the target beams that may be tethered to.

[0053] Step S3: The terminal uei measures the signal strength of the source beam and adjacent beams when it is near the edge of the source beam, according to the measurement configuration sent by the base station, and periodically reports the measurement report to the base station.

[0054] After the prediction is completed, the base station sends a measurement configuration to the terminal UEI based on the prediction results. This measurement configuration includes the measurement start time, the object to be measured, the measurement content, and the measurement period. The measurement time starts when the terminal UEI is near the edge of the predicted source beam and ends when it receives a handover instruction from the base station. The object to be measured is the predicted source beam and target beam, the measurement content is signal strength, the measurement period is a multiple of the beam reference signal broadcast period, and the measurement report reporting period is greater than or equal to the measurement period to ensure that a sufficient number of measurement reports can be reported during the measurement period. Figure 2 The diagram shows the measurement and reporting time points of the terminal uei in this embodiment. The smaller diameter filled dot represents the measurement time point, and the smaller diameter unfilled dot represents the reporting time point. Figure 2 As shown, in this embodiment, the reporting period is three times the measurement period, and the reporting time is also the measurement time. Figure 2 Each reporting time overlaps with a measurement time; in other embodiments, the reporting period can be set to other values, and the reporting time can also be a non-measurement time.

[0055] During measurement, a shorter measurement cycle and a longer reporting cycle are required, mainly to reduce the occupation of channel resources. The specific size of the reporting cycle is mainly determined by two factors: the expected occupation of channel resources and the speed of satellite movement. However, it is necessary to ensure that the reporting cycle is not less than the measurement cycle.

[0056] Step S4: The base station obtains the beam that actually covers the terminal's UEI at the reported time based on the measurement report, and obtains the beam that theoretically covers the terminal's UEI at the reported time based on the prediction result. It then compares whether the two beams are consistent at the reported time to obtain the prediction accuracy (DOA) corresponding to the terminal's UEI. uei ;

[0057] The base station acquires and stores the signal strength measurement values ​​of each measured beam at each reporting time based on the measurement reports submitted at each time. When the number of stored measurement values ​​exceeds the preset maximum measurement value N... max When this happens, the first historical measurement value needs to be deleted;

[0058] When the signal strength of a certain beam is greater than the second threshold γ at a certain reporting time receive When it is determined that the terminal reporting at that time is covered by the beam, where γ receive The expected minimum received signal strength threshold;

[0059] The base station calculates the prediction accuracy (DOA) of the terminal's UEE using the formula. uei : Where N is the number of signal strength measurements currently recorded. This represents the coverage consistency results of the source beam at the corresponding time points for each signal strength measurement. For each signal strength measurement value, the coverage consistency results of the target beam are recorded in Table 3. The coverage consistency results of the source beam and the target beam are recorded at times j = 0, 1, 2, 3, 4, 5.

[0060] Table 3

[0061]

[0062] The coverage consistency result of the source beam is based on the formula. Calculate the time corresponding to each signal strength measurement value (t0-t5 in this embodiment), at which the base station predicts that the terminal is covered by the source beam. otherwise, When the measurement report determines that the terminal is covered by the source beam, otherwise, The coverage consistency result of the target beam At the time corresponding to each signal strength measurement value (t0-t5 in this embodiment), when the base station predicts that the terminal is covered by the source beam, otherwise, When the measurement report determines that the terminal is covered by the source beam, otherwise, The details are shown in Table 4:

[0063] Table 4

[0064]

[0065]

[0066] Step S5: The base station generates a first type of weight based on the number of measurement reports reported by all terminals, generates a second type of weight based on the prediction accuracy of all terminals, and performs a weighted sum of the prediction accuracy of all terminals based on the first and second type of weights to determine and update the overall prediction accuracy (DOA) of all terminals currently accessing the base station. sys_reliability , when DOA sys_reliability Greater than the set first threshold If the prediction is accurate, the base station is considered to have reliable predictions for all terminals as a whole; otherwise, the predictions are considered to be unreliable as a whole.

[0067] In this embodiment, the base station is based on the formula Determine and update the overall accuracy (DOA) of prediction results for all terminals currently accessing the base station. sys_reliability ,in, For the first type of weight, R uei For the second type of weight, when DOA uei Greater than the set third threshold γ DOA At that time, R uei M is 1, M is the number of terminals currently accessing the satellite, and N is the number of measurement reports currently recorded. max This is the preset maximum number of recorded measurement reports;

[0068] For cases with only a single terminal uei, if DOA uei Greater than the third threshold γ DOA If so, it is considered that the current prediction for this terminal is incorrect;

[0069] In the case of multiple terminals, if the base station's prediction of all terminals is generally reliable, but the prediction accuracy (DOA) of a certain terminal's UEE is... uei Not greater than the third threshold γ DOA If the location information of the terminal is incorrect, the prediction result is correct; however, if the DOA (Location of Attached) is incorrect, the prediction result is correct. sys_reliability Not greater than the set first threshold If the prediction system is deemed unreliable as a whole, it means that the ephemeris information on the satellite side may be incorrect.

[0070] First threshold and the third threshold γ DOA The specific value of these two thresholds depends on the accuracy of satellite trajectory prediction and the accuracy of the terminal's reported location. They can be determined through actual measurements or scenario simulation. For example, if the measured terminal location is normal, the prediction accuracy (DOA) will be [value missing].uei When the terminal location information is intentionally given as x1, the prediction accuracy (DOA) is [value missing]. uei If x2, then the third threshold γ DOA It can be set to a value between x2 and x1; similarly, when the ephemeris information obtained from actual measurements is correct, the overall accuracy of the prediction result (DOA) is [value missing]. sys_reliability When y1 is used, and ephemeris information is intentionally given incorrectly, the overall accuracy of the prediction results is DOA. sys_reliability If y2, then the first threshold It can be set to a value between y2 and y1;

[0071] Considering that the predicted and measured values ​​of the neighboring beams of the non-target beam are relatively low in most cases, while the source beam and the predicted target beam have high signal strength at certain times during the measurement period, it is generally necessary to use the source beam and the target beam to judge the prediction accuracy.

[0072] Step S6: If the measurement report reporting has not yet ended, proceed to step S4 to continue to analyze the overall accuracy (DOA) of the current prediction results of the base station. sys_reliability Update; otherwise, stop evaluating the overall accuracy (DOA) of the prediction results. sys_reliability Update.

[0073] Corresponding to the method, the low-Earth orbit satellite handover prediction accuracy assessment device includes a base station, a transceiver unit, and a terminal. The base station includes a processor, which is connected to the terminal through the transceiver unit. The processor includes:

[0074] The module is initialized during the first operation of the low-Earth orbit satellite communication system to obtain sufficient measurement values.

[0075] When any terminal UEI accesses a satellite, it makes a prediction based on the satellite's ephemeris information and the position reported by the terminal UEI, and sends a measurement configuration module to the terminal UEI according to the prediction result. The prediction result includes the beam that the terminal UEI theoretically covers and the target beam that may be tangential.

[0076] Based on the measurement report, obtain the beam that actually covers the terminal's UEI at the reported time. Based on the prediction results, obtain the beam that theoretically covers the terminal's UEI at the corresponding time. Compare whether the two beams are consistent at the corresponding time to obtain the prediction accuracy (DOA) for that terminal's UEI. uei The module;

[0077] Before the measurement report reporting is completed, a first type of weight is generated based on the number of measurement reports reported by all terminals, and a second type of weight is generated based on the prediction accuracy of all terminals. The prediction accuracy of all terminals is then weighted and summed according to the first and second type of weights to determine and update the overall prediction accuracy (DOA) of all terminals currently accessing the base station. sys_reliability The module, which is in DOA sys_reliability If the value exceeds the set first threshold, the base station is considered to have reliable predictions for all terminals as a whole; otherwise, the predictions are considered to be unreliable as a whole.

[0078] According to the measurement configuration sent by the base station, the terminal measures the signal strength of the source beam and adjacent beams when it is near the edge of the source beam, and periodically reports the measurement report to the base station.

[0079] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A method for judging the accuracy of low-Earth orbit satellite handover prediction, characterized in that: Includes the following steps: Step S1: Initialize the low-Earth orbit satellite communication system during its first run to obtain sufficient measurement values; Step S2: When any terminal uei accesses the satellite, the base station makes a prediction based on the satellite's ephemeris information and the location reported by the terminal uei, and sends the measurement configuration to the terminal uei according to the prediction result. The prediction result includes the beam that the terminal uei theoretically covers and the target beam that may be tangential. Step S3: The terminal uei measures the signal strength of the source beam and adjacent beams when it is near the edge of the source beam, according to the measurement configuration sent by the base station, and periodically reports the measurement report to the base station. Step S4: The base station obtains the beam that actually covers the terminal's UEI at the reported time based on the measurement report, and obtains the beam that theoretically covers the terminal's UEI at the reported time based on the prediction result. It then compares whether the two beams are consistent at the reported time to obtain the prediction accuracy (DOA) corresponding to the terminal's UEI. uei ; Step S5: The base station generates a first type of weight based on the number of measurement reports reported by all terminals, generates a second type of weight based on the prediction accuracy of all terminals, and performs a weighted sum of the prediction accuracy of all terminals based on the first and second type of weights to determine and update the overall prediction accuracy (DOA) of all terminals currently accessing the base station. sys_reliability , when DOA sys_reliability If the value exceeds the set first threshold, the base station is considered to have reliable predictions for all terminals as a whole; otherwise, the predictions are considered to be unreliable as a whole. Step S6: If the measurement report reporting has not yet ended, proceed to step S4 to continue to analyze the overall accuracy (DOA) of the current prediction results of the base station. sys_reliability Update; otherwise, stop evaluating the overall accuracy (DOA) of the prediction results. sys_reliability Update.

2. The method for judging the accuracy of low-Earth orbit satellite handover prediction according to claim 1, characterized in that: Step S1 includes the following steps: Step S11: Before the terminal accesses the satellite, the overall accuracy (DOA) of the prediction results is calculated. sys_reliability The value is set to 1; Step S12: When any terminal accesses the satellite, the satellite performs a handover prediction based on the satellite's ephemeris information and the location information reported by the terminal accessing the satellite, and sends a measurement configuration to the terminal according to the prediction result. The prediction result includes the beam that the terminal theoretically covers and the target beam that may be tangential. Step S13: The terminal measures the signal strength of the source beam and the adjacent beam when it is near the edge of the source beam, according to the measurement configuration sent by the base station, and periodically reports the measurement report to the base station. Step S14: The base station obtains and stores the measurement values ​​at the reporting time based on the measurement report, without updating the overall accuracy (DOA) of the prediction results. sys_reliability ; Step S15: When the sum of the measurement values ​​reported by all terminals accessing the satellite exceeds the preset measurement value threshold, proceed to step S2.

3. The method for judging the accuracy of low-Earth orbit satellite handover prediction according to claim 1, characterized in that: In step S2, the base station analyzes the beams that theoretically cover the terminal uei and the possible target beams that may be tangentially oriented to it in the next period of time based on the satellite ephemeris information and the location reported by the terminal uei. It also stores the times when the terminal uei enters and leaves each beam, as well as the times when the terminal uei tangentially oriented to each possible target beam.

4. The method for judging the accuracy of low-Earth orbit satellite handover prediction according to claim 1, 2, or 3, characterized in that: The measurement configuration includes measurement start time, measurement object, measurement content, and measurement period. The measurement time starts when the terminal is near the edge of the predicted source beam and ends when it receives a handover instruction from the base station. The measurement object is the predicted source beam and target beam. The measurement content is signal strength. The measurement period is a multiple of the beam reference signal broadcast period. The reporting period of the measurement report is greater than or equal to the measurement period.

5. The method for judging the accuracy of low-Earth orbit satellite handover prediction according to claim 1, 2, or 3, characterized in that: In step S4, the base station obtains and stores the signal strength measurement values ​​of each measured beam at each reporting time based on the measurement reports reported at each time. When the signal strength of a certain beam at a certain reporting time is greater than the second threshold, it is determined that the terminal is covered by the beam at that reporting time.

6. The method for judging the accuracy of low-Earth orbit satellite handover prediction according to claim 5, characterized in that: In step S4, the prediction accuracy (DOA) of the terminal uei is calculated according to the formula. uei : Where N is the number of signal strength measurements currently recorded. This represents the coverage consistency results of the source beam at the corresponding time points for each signal strength measurement. This represents the coverage consistency result of the target beam at the time corresponding to each signal strength measurement value.

7. The method for judging the accuracy of low-Earth orbit satellite handover prediction according to claim 5, characterized in that: The coverage consistency result of the source beam At the time corresponding to each signal strength measurement value, when the base station predicts that the terminal is covered by the source beam, otherwise, When the measurement report determines that the terminal is covered by the source beam, otherwise, The coverage consistency result of the target beam At the time corresponding to each signal strength measurement value, when the base station predicts that the terminal is covered by the source beam, otherwise, When the measurement report determines that the terminal is covered by the source beam, otherwise, 8. A method for judging the accuracy of low-Earth orbit satellite handover prediction according to claim 1, 2, or 3, characterized in that: In step S5, the base station follows the formula Determine and update the overall accuracy (DOA) of prediction results for all terminals currently accessing the base station. sys_reliability ,in, For the first type of weight, R uei For the second type of weight, when DOA uei When R is greater than the set third threshold, uei M is 1, M is the number of terminals currently accessing the satellite, and N is the number of measurement reports currently recorded. max This is the preset maximum number of recorded measurement reports.

9. The method for judging the accuracy of low-Earth orbit satellite handover prediction according to claim 8, characterized in that: In step S5, when the base station's predictions for all terminals are generally reliable, if the prediction accuracy (DOA) of a certain terminal's uei is... uei If the value is not greater than the third threshold, then the location information of the terminal is determined to be incorrect.

10. A device for judging the accuracy of low-Earth orbit satellite handover prediction, characterized in that: It includes a base station, a transceiver unit, and a terminal. The base station includes a processor, which is connected to the terminal via the transceiver unit. The processor includes: The module is initialized during the first operation of the low-Earth orbit satellite communication system to obtain sufficient measurement values. When any terminal UEI accesses the satellite, it makes a prediction based on the satellite's ephemeris information and the position reported by the terminal UEI, and sends a measurement configuration module to the terminal UEI according to the prediction result. The prediction result includes the beam that the terminal UEI theoretically covers and the target beam that may be tangential. Based on the measurement report, obtain the beam that actually covers the terminal's UEI at the reported time. Based on the prediction results, obtain the beam that theoretically covers the terminal's UEI at the corresponding time. Compare whether the two beams at the corresponding time are consistent to obtain the prediction accuracy (DOA) for that terminal's UEI. uei The module; Before the measurement report reporting is completed, a first type of weight is generated based on the number of measurement reports reported by all terminals, and a second type of weight is generated based on the prediction accuracy of all terminals. The prediction accuracy of all terminals is then weighted and summed according to the first and second type of weights to determine and update the overall prediction accuracy (DOA) of all terminals currently accessing the base station. sys_reliability The module, which is in DOA sys_reliability If the value exceeds the set first threshold, the base station is considered to have reliable predictions for all terminals as a whole; otherwise, the predictions are considered to be unreliable as a whole. According to the measurement configuration sent by the base station, the terminal measures the signal strength of the source beam and adjacent beams when it is near the edge of the source beam, and periodically reports the measurement report to the base station.

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