CN114828134A - Communication satellite switching method, computer device and storage medium - Google Patents
Communication satellite switching method, computer device and storage medium Download PDFInfo
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- CN114828134A CN114828134A CN202210440482.7A CN202210440482A CN114828134A CN 114828134 A CN114828134 A CN 114828134A CN 202210440482 A CN202210440482 A CN 202210440482A CN 114828134 A CN114828134 A CN 114828134A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
- H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources
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Abstract
The invention discloses a communication satellite switching method, a computer device and a storage medium, wherein the communication satellite switching method comprises the steps of predicting an actual call drop rate time sequence to obtain a predicted call drop rate time sequence, selecting the minimum value of the predicted call drop rates, switching a target terminal from a source communication satellite to a target communication satellite at the predicted switching time corresponding to the minimum value, and the like. The invention can predict the call drop rate of a period of time in the future according to the actual call drop rate achieved by switching between the original source communication satellite and the target communication satellite, select the moment with the minimum predicted call drop rate, and switch the target terminal from the source communication satellite to be connected with the target communication satellite, so that the target terminal can more easily achieve the minimum call drop rate after being switched to be connected with the target communication satellite, thereby enabling the target communication satellite to provide better communication service for the target terminal, and being beneficial to improving the communication quality and the communication stability. The invention is widely applied to the technical field of satellite communication.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a communication satellite switching method, a computer device and a storage medium.
Background
Current satellite communications rely primarily on low earth orbit satellites to provide communication services. The low earth orbit satellite moves at a high speed relative to the ground communication terminal, and the signal coverage area of the same low earth orbit satellite also moves at a high speed relative to the ground communication terminal, so that the ground communication terminal needs to be connected with the communication satellite to be kept away in time through a communication satellite switching mechanism and is switched to be connected with the communication satellite still having signal coverage, thereby avoiding signal interruption and ensuring the continuity and stability of communication. When there are a plurality of communication satellites from which a connection can be switched, it is common to select the communication satellite that provides the best communication quality and switch the communication terminal to a past connection. However, even if a communication satellite to be switched to is selected, since the communication satellite moves at a high speed with respect to the ground, the position of the communication satellite with respect to the communication terminal may change greatly in a short time, so that the communication quality that the communication satellite can provide to the communication terminal at different times may change, and even the access success rate of the communication satellite may be affected. In the current technology related to communication satellite switching, because the correct time point is not selected for communication satellite switching, the situations of communication terminals or greatly increased communication delay and the like easily occur.
Disclosure of Invention
The invention aims to provide a communication satellite switching method, a computer device and a storage medium, aiming at the technical problems that the communication terminal or the communication delay is greatly increased and the like because the correct time point is not selected for switching the communication satellite in the prior communication satellite switching related technology.
In one aspect, an embodiment of the present invention includes a method for switching a communication satellite, including:
determining a source communication satellite and a destination communication satellite; the source communication satellite is a communication satellite which is currently connected with a target terminal, and the target communication satellite is a communication satellite which is switched to be connected by the target terminal;
acquiring an actual call drop rate time sequence; the actual call drop rate time sequence is a time sequence formed by recording the actual call drop rate and the actual switching moment when at least one communication terminal is switched from the source communication satellite to be connected with the target communication satellite;
predicting the actual call drop rate time sequence to obtain a predicted call drop rate time sequence; the predicted call drop rate time sequence comprises a plurality of predicted call drop rates and predicted switching moments corresponding to the predicted call drop rates;
selecting the minimum value of the predicted call drop rates;
and switching the target terminal from the source communication satellite to the target communication satellite at the predicted switching time corresponding to the minimum value.
Further, the obtaining of the actual call drop rate time series includes:
when the communication terminal is switched from the source communication satellite to be connected with the target communication satellite, recording the actual switching time of the communication terminal;
and determining the actual call drop rate corresponding to the actual switching moment.
Further, the determining the actual call drop rate corresponding to the actual switching time includes:
acquiring the total switching quantity and the successful switching quantity which are completed at the same actual switching moment; the total switching number is the total number of the communication terminals switched from the source communication satellite to be connected with the target communication satellite at the actual switching time, and the successful switching number is the number of the communication terminals normally obtaining the communication service of the target communication satellite after the switching is carried out at the actual switching time;
and taking the quotient of the difference between the total switching quantity and the successful switching quantity which are completed at the same actual switching time and the total switching quantity as the actual call drop rate corresponding to the actual switching time.
Further, the recording an actual handoff time of the communication terminal when the communication terminal is handed off from the source communication satellite to the destination communication satellite comprises:
determining a first switching time window corresponding to the process of switching the communication terminal from the source communication satellite to be connected with the destination communication satellite;
and determining the relative time progress in the first switching time window when the communication terminal is switched from the source communication satellite to be connected with the destination communication satellite as the actual switching time of the communication terminal.
Further, the performing of the handover of the target terminal from the source communication satellite to the destination communication satellite at the predicted handover time corresponding to the minimum value includes:
determining a second switching time window corresponding to the process of switching the target terminal from the source communication satellite to be connected with the target communication satellite;
determining a relative time progress in the second switching time window according to the predicted switching time corresponding to the minimum value;
and when the second switching time window is entered and the relative time progress is reached, switching the target terminal from the source communication satellite to the target communication satellite.
Further, the determining a corresponding first switching time window for the process of switching the communication terminal from the source communication satellite to the connection with the destination communication satellite includes:
the communication terminal samples the signal intensity of the source communication satellite to obtain a first signal intensity value;
the communication terminal samples the signal intensity of the target communication satellite to obtain a second signal intensity value;
performing curve fitting on the sampling values of the first signal intensity value and the second signal intensity value to obtain a first curve;
and taking the time corresponding to one point on the first curve as the starting time of the first switching time window, and taking the time corresponding to the other point on the first curve as the ending time of the first switching time window, so as to determine the first switching time window.
Further, the determining a corresponding second switching time window for the process of switching the target terminal from the source communication satellite to the connection with the destination communication satellite includes:
the target terminal samples the signal intensity of the source communication satellite to obtain a third signal intensity value;
the target terminal samples the signal intensity of the target communication satellite to obtain a fourth signal intensity value;
performing curve fitting on the sampling values of the third signal intensity value and the fourth signal intensity value to obtain a second curve;
and taking the time corresponding to one point on the second curve as the starting time of the second switching time window, and taking the time corresponding to the other point on the second curve as the ending time of the second switching time window, so as to determine the second switching time window.
Further, the predicting the actual call drop rate time series to obtain a predicted call drop rate time series includes:
performing prophet model modeling on the actual call drop rate time sequence;
and acquiring the predicted call drop rate time sequence output by the prophet model.
In another aspect, an embodiment of the present invention further includes a computer apparatus, including a memory and a processor, where the memory is used to store at least one program, and the processor is used to load the at least one program to perform the communication satellite handover method in the embodiment.
In another aspect, the present invention further includes a storage medium in which a program executable by a processor is stored, the program executable by the processor being configured to perform the communication satellite switching method in the embodiments when executed by the processor.
The invention has the beneficial effects that: according to the communication satellite switching method in the embodiment, the call drop rate of a future period of time can be predicted according to the actual call drop rate achieved by switching between the original source communication satellite and the target communication satellite, the moment with the minimum predicted call drop rate is selected, the target terminal is switched to be connected with the target communication satellite from the source communication satellite, and the minimum call drop rate can be achieved more easily after the target terminal is switched to be connected with the target communication satellite, so that the target communication satellite can provide better communication service for the target terminal, and the communication quality and the communication stability are improved.
Drawings
FIG. 1 is a flow chart of a method for handing off a communication satellite according to an embodiment;
FIG. 2 is a schematic illustration of a source communication satellite and a destination communication satellite in an embodiment;
FIG. 3 is a flowchart illustrating operation of a system for performing a method for handoff of a communication satellite according to an embodiment;
FIG. 4 is a schematic diagram of obtaining a time series of predicted call drop rates in an embodiment;
FIG. 5 is a diagram illustrating an embodiment of switching time windows.
Detailed Description
In this embodiment, referring to fig. 1, a method for switching a communication satellite includes the following steps:
s1, determining a source communication satellite and a target communication satellite;
s2, acquiring an actual call drop rate time sequence; the actual call drop rate time sequence is a time sequence formed by recording the actual call drop rate and the actual switching moment when at least one communication terminal is switched from a source communication satellite to be connected with a target communication satellite;
s3, predicting the actual call drop rate time sequence to obtain a predicted call drop rate time sequence; the predicted call drop rate time sequence comprises a plurality of predicted call drop rates and predicted switching moments corresponding to the predicted call drop rates;
s4, selecting the minimum value of the predicted call drop rates;
and S5, switching the target terminal from the source communication satellite to the target communication satellite at the predicted switching time corresponding to the minimum value.
In this embodiment, the communication satellite may also be referred to as a space base station. Referring to fig. 2, several communication satellites, which are designated by sat01, sat02, sat03, sat04 and the like, form signal coverage areas on the ground as shown by areas designated by 1, 2, 3 and 4, respectively. These communication satellites move relative to the ground in the direction of the arrows in fig. 2. Even in the case of a low earth orbit satellite, the height of the communication satellite with respect to the ground is relatively high, and therefore, a communication terminal held by hand such as a mobile phone or a communication terminal mounted on a vehicle such as an automobile, a ship, or an aircraft can be regarded as being located on the ground and stationary with respect to the ground.
In this embodiment, one communication satellite can be connected to a plurality of communication terminals. The communication terminal for which the determination of the switching time from the source communication satellite to the destination communication satellite is required to perform steps S1-S5 is referred to as the "target terminal" in this embodiment. In the present embodiment, when only the "communication terminal" is referred to, one or more other communication terminals than the target terminal are referred to without particular reference.
For a target terminal located within the coverage area of reference numeral 1 in fig. 2, since the communication satellite denoted by reference numeral sat01 in fig. 2 currently provides communication service for the target terminal, the communication satellite sat01 is a source communication satellite, the communication satellite sat01 is far away from the target terminal, the communication satellite sat02 is close to the target terminal, that is, the target terminal will enter the coverage area of reference numeral 2, and when the target terminal is reached, the target terminal will switch to be connected with the communication satellite sat02, and the communication satellite sat02 provides communication service for the target terminal, so the communication satellite sat01 is a destination communication satellite. For a target terminal located within the coverage area marked with number 3 in fig. 2, communication satellite sat03 is the source communication satellite, and communication satellite sat04 is the destination communication satellite.
In the present embodiment, steps S1-S5 may be performed by the communication system shown in fig. 3. The AMF represents Access and Mobility Management Function (Access and Mobility Management Function) Network elements in the 5G core Network, the NWDAF represents Network Data analysis Function (Network Data analysis Function) Network elements in the 5G core Network, and the database is also a part of the 5G core Network. Steps S1-S5 are mainly performed by the NWDAF and the AMF in the 5G core network, where the AMF receives the handover request from the target terminal, and triggers the NWDAF to perform steps S1-S4 according to the handover request. The actual time series of call drop rates to be used by the NWDAF in performing steps S1-S4 may be stored in and read from a database. The NWDAF transmits the predicted handover time obtained by performing steps S1-S4 to the AMF, and the AMF performs step S5 to switch the target terminal from connection with the source communication satellite to connection with the destination communication satellite at the predicted handover time.
In this embodiment, steps S1 to S5 will be described by taking as an example that the target terminal is located within the coverage area denoted by reference numeral 1 in fig. 2. At this time, the source communication satellite in step S1 is communication satellite sat01, and the destination communication satellite is communication satellite sat 02. In this embodiment, unless otherwise specified, the "source communication satellite" is always referred to as "communication satellite sat 01", and the "destination communication satellite" is always referred to as "communication satellite sat 02", which may be directly labeled as source communication satellite sat01 and destination communication satellite sat 02.
In this embodiment, the source communication satellite sat01 is connected to other communication terminals in the same time slot and past time slots in addition to the target terminal, and these communication terminals also complete the handover from the source communication satellite sat01 to the destination communication satellite sat 02. In this embodiment, the NWDAF records the actual call drop rate time series formed by these communication terminals when switching from the source communication satellite sat01 to the destination communication satellite sat 02.
In this embodiment, the actual call drop rate time series is shown as solid circles on the left side in fig. 4, for example, one of the solid circles indicates "at the actual switching time t2, the AMF controls the plurality of communication terminals to be switched from the source communication satellite sat01 to the destination communication satellite sat02, and the actual call drop rate is r 2".
In this embodiment, when determining an actual call drop rate corresponding to a certain actual switching time, the following steps may be specifically performed:
s201, acquiring the total switching quantity and the successful switching quantity which are completed at the same actual switching time;
s202, taking the quotient of the difference between the total switching quantity and the successful switching quantity which are completed at the same actual switching time and the total switching quantity as the actual call drop rate corresponding to the actual switching time.
The following describes steps S201 to S202, taking the determination of the actual call drop rate r2 corresponding to the actual switching time t2 as an example. In step S201, the true value is acquiredTotal number of handovers n completed at time t2 t And the number of successful handover n s . Wherein the total number of handovers n t Indicates the total number of all communication terminals (including the communication terminal which has succeeded in the handover and the communication terminal which has failed in the handover) which are handed over from the source communication satellite to the connection with the destination communication satellite at the actual handover time t2, and the number of successful handovers n s Indicates the number of communication terminals that normally obtain the communication service of the destination communication satellite after the handover is performed at the actual handover time t2, i.e., the number of communication terminals that have succeeded in the handover, and therefore the total number of handovers n t And the number of successful handover n s The difference of (i.e. n) t -n s It is possible to indicate the number of failed handovers, that is, the number of communication terminals failing to normally obtain the communication service of the destination communication satellite after the handover is performed at the actual handover time t2, and the number of communication terminals failing to complete the handover at the actual handover time t 2.
In step S202, the total switching number n completed at the actual switching time t2 t And the number of successful handover n s The difference of (i.e. n) t -n s And the total number of handovers n t Quotient of, i.e. (n) t -n s )/n t As the actual call drop rate r2 corresponding to the actual switching time t2, that is, r2 is equal to (n) t -n s )/n t 。
In this embodiment, when step S3 is executed, that is, the step of predicting the time series of the actual call drop rate to obtain the time series of the predicted call drop rate, the following steps may be specifically executed:
s301, performing prophet model modeling on the actual call drop rate time sequence;
s302, obtaining a predicted call drop rate time sequence output by the prophet model.
In step S301, a prophet algorithm is used, and the time series Yt is divided into several parts, namely, a season item St, a trend item Tt, and a remainder item Rt., where t > is 0, with the actual time series of call drop rate as the time series Yt:
Yt＝St+Tt+Rt.
therefore, the prophet model established in step S301 can be expressed as Yt ═ St + Tt + Rt.
In addition to the addition form, the prophet model established in step S301 can also be expressed as a multiplication form:
Yt＝St*Tt*Rt
the above formula is equivalent to InYt + instt + InRt.
In addition to the seasonal term, the trend term, and the remaining term, the effect of holidays can be generally considered, so when the prophet model is established, the above four terms can be considered at the same time, and thus the established prophet model can be expressed as:
Yt＝gt+st+ht+e
wherein gt represents a trend term which represents the variation trend of the time sequence on the non-periodic basis, st represents a periodic term or a seasonal term, generally in units of weeks or years, ht represents a holiday term which represents whether holidays exist on the day, e represents an error, namely a residual term, and prophet is obtained by fitting the terms and then accumulating the terms to obtain a predicted value of the time sequence.
In this embodiment, the time sequence of the predicted call drop rate obtained by performing step S3 may be as shown in the right square in fig. 4, wherein the coordinate axis of the predicted call drop rate and the coordinate axis of the actual call drop rate may have the same scale. In the time series of the predicted call drop rates shown in fig. 4, the call drop rates that may be achieved by switching the target terminal from the source communication satellite to the destination communication satellite at times t6, t7, t8, etc. are respectively shown.
In this embodiment, step S4 is executed to select the minimum value of the predicted call drop rates. For example, by performing step S4 on the predicted call drop rate time series shown in fig. 4, it can be determined that the predicted call drop rate corresponding to time t7 is the smallest. In step S5, the handover of the target terminal from the source communication satellite to the target communication satellite is performed at the predicted handover time corresponding to the minimum value, and for example, when the predicted call drop rate corresponding to the determination time t7 is minimum, the AMF switches the target terminal from the source communication satellite to the connection with the target communication satellite at the time t 7.
In this embodiment, by executing steps S1-S5, the call drop rate of a future period of time can be predicted according to the actual call drop rate achieved by the previous switching between the source communication satellite and the destination communication satellite, the time at which the predicted call drop rate is the smallest is selected, and the target terminal is switched from the source communication satellite to be connected with the destination communication satellite, so that the minimum call drop rate can be achieved more easily after the target terminal is switched to be connected with the destination communication satellite, and thus the destination communication satellite can provide better communication service for the target terminal, which is beneficial to improving communication quality and communication stability.
In the present embodiment, the "actual switching time" such as t1 and t2 and the "predicted switching time" such as t6 and t7 in fig. 4 may be data indicating an absolute time in the form of "08 hours, 01 minutes and 10 seconds every 2 months and 10 days 2022" or may be data indicating a relative time progression within a certain time period as shown in fig. 5.
Referring to fig. 5, the upper rectangle represents a first switching time window, i.e. a corresponding switching time window during the process of switching one communication terminal (not belonging to the target terminal) from the source communication satellite sat01 to the connection with the destination communication satellite sat 02; the lower rectangle represents a second switching time window, i.e., the corresponding switching time window during the switching of the target terminal from the source communication satellite sat01 to the connection with the destination communication satellite sat 02.
In this embodiment, for the communication terminals that do not belong to the target terminal and are referred to in steps S201 to S202, the switching time window corresponding to such a communication terminal is referred to as a first switching time window, and the switching time window corresponding to the target terminal is referred to as a second switching time window. A switching time window, whether it be a first switching time window or a second switching time window, may be represented by its starting time (e.g. expressed as an absolute time of 08 hours 00 minutes 00 seconds at 2 months and 10 days 2022) and its ending time (e.g. expressed as an absolute time of 02 minutes 00 seconds at 08 days 2 months and 10 days 2022).
The switching time window shown in fig. 5 means that it is appropriate for the communication terminal to switch from the source communication satellite sat01 to connect with the destination communication satellite sat02 within the switching time window. The switching time windows may be different for different communication terminals. Further, the time points of t1, t2, etc. represent relative time progresses within one switching time window, and for example, "t 1 time" may represent a time point reached after 10% of the total length of one switching time window from the start time of the switching time window; similarly, "time t 8" may indicate the time reached after 80% of the total length of a switching time window from the start of the switching time window.
In this embodiment, whether the first switching time window or the second switching time window is determined by the signal strength between one communication terminal and the source communication satellite and the destination communication satellite.
In this embodiment, when it is required to determine a process of switching a communication terminal (not belonging to a target terminal) from a source communication satellite to a connection with a target communication satellite, a corresponding first switching time window may perform the following steps:
A201. sampling, by the communication terminal, a signal strength of the source communication satellite to obtain a first signal strength value S1;
A202. the communication terminal samples the signal intensity of the target communication satellite to obtain a second signal intensity value S2;
A203. the sampled values of the first signal strength value S1 and the second signal strength value S2 include (S1) 1 ，S2 1 )、(S1 2 ，S2 2 ) … … etc]Performing curve fitting to obtain a first curve;
A204. and taking the time corresponding to one point on the first curve as the starting time of the first switching time window, and taking the time corresponding to the other point on the first curve as the ending time of the first switching time window, thereby determining the first switching time window.
In steps a201 and a202, the communication terminal may perform signal strength sampling through radio control signaling (RRC).
The principle of steps A201-A204 is that: the signal strength of the source communication satellite and the target communication satellite is sampled by the communication terminal, and a series of sampled values can be obtained (S1) 1 ，S2 1 )、(S1 2 ，S2 2 ) … … are provided. Wherein S1 1 、S1 2 … … denotes a first signal strength valueSeries of samples of S1, S2 1 、S2 2 … …, represents a series of samples of the second signal strength value S2, each sample corresponding to a certain sampling time (which may be represented by an absolute time instant). By sampling values (S1) 1 ，S2 1 )、(S1 2 ，S2 2 ) … …, the signal strength of the source and destination communication satellites at the communication terminal can be predicted to a value outside the sampling time. In step a204, two points on the first curve may be selected, so that the signal strength sampling value and the fitting value corresponding to the curve segment of the first curve between the two points both meet the requirement of the communication terminal to switch from the source communication satellite to the destination communication satellite, and the first switching time window is determined by taking the previous time as the starting time of the first switching time window and the later time as the ending time of the first switching time window for the time corresponding to the two points selected on the first curve. In the first switching time window, a larger degree of confidence can be ensured that the signal strength between the communication terminal and the source communication satellite and the target communication satellite meets the switching requirement, thereby improving the switching success rate.
In this embodiment, when it is required to determine a process of switching the target terminal from the source communication satellite to the connection with the destination communication satellite, the following steps may be executed in the corresponding first switching time window:
B201. the target terminal samples the signal intensity of the source communication satellite to obtain a third signal intensity value S3;
B202. the target terminal samples the signal strength of the target communication satellite to obtain a fourth signal strength value S4;
B203. the sampled values of the third signal strength value S3 and the fourth signal strength value S4 include (S3) 1 ，S4 1 )、(S3 2 ，S4 2 ) … … etc]Performing curve fitting to obtain a second curve;
B204. and taking the moment corresponding to one point on the second curve as the starting moment of the second switching time window, and taking the moment corresponding to the other point on the second curve as the ending moment of the second switching time window, so as to determine the second switching time window.
The principle of steps B201-B204 is the same as that of steps a201-a 204. By executing steps B201-B204, a second switching time window can be determined, and within the second switching time window, a greater degree of confidence can be made that the signal strength between the target terminal and the source and destination communication satellites meets the requirements for switching, thereby improving the success rate of switching.
Upon executing steps a201-a204 and steps B201-B204, in this embodiment, when executing step S2 to record the actual switching time of a communication terminal, the NWDAF may first determine the first switching time window corresponding to the communication terminal, and then convert the actual switching time (expressed as an absolute time) of the communication terminal into a relative time. For example, when the corresponding first switching time window of a communication terminal is from 00 minutes 00 seconds at 10 days 08 at 2 months 2022 to 00 minutes 00 seconds at 08 days 08 at 10 days 08 at 2 months 2022, i.e. the length of the first switching time window is 2 minutes, and the actual switching time (expressed as an absolute time) of the communication terminal is from 01 minutes 00 seconds at 10 days 08 at 2 months 2022 to 10 months 2022, and 1 minute passes from the start time of the first switching time window, the relative time progression of the actual switching time of the communication terminal in the first switching time window is 50%, referring to fig. 5, the actual switching time of the communication terminal can be expressed as a relative time t 5.
In the embodiment, after steps a201-a204 and steps B201-B204 are executed and the actual switching time of one communication terminal is represented by the relative time, when step S5 is executed, that is, when the target terminal is switched from the source communication satellite to the destination communication satellite at the predicted switching time corresponding to the minimum value, the following steps may be specifically executed:
s501, determining a process that a target terminal is switched to be connected with a target communication satellite from a source communication satellite, and a corresponding second switching time window;
s502, determining a relative time progress in a second switching time window according to the predicted switching time corresponding to the minimum value;
and S503, when entering a second switching time window and reaching a relative time progress, switching the target terminal from the source communication satellite to the target communication satellite.
In step S501, the second switching time window may be expressed in absolute time, for example, the second switching time window may be 00 min 00S at 18 h 13 h 18 h 3 h 2022 year 2 month 13 h 03 min 00S at 18 h 2 month 13 h 2022 year, and the length thereof is 3 minutes.
In step S502, assuming that the predicted switching time corresponding to the minimum value is t7, since t7 is already represented by a relative time, the relative time progression in the second switching time window is also t 7.
In step S503, referring to the situation shown in fig. 5, the predicted switching time corresponding to the minimum value is t7, which indicates that the predicted switching time corresponding to the minimum value is a time that is reached after 70% of the length of the second switching time window from the start time of the second switching time window, i.e., if the second switching time window can be 18 hours 00 minutes 00 seconds at 2/13/18 hours 03 minutes 00 seconds at 2022/13/18 at 2022/2, and the predicted switching time corresponding to the minimum value is t5, then the target terminal is switched from the source communication satellite to the destination communication satellite at02 minutes 06 seconds at 18 hours at 13/18 at 2022/2022 (at this time, 126 seconds have passed from the start time, i.e., 70% of the length of the second switching time window).
In this embodiment, by executing steps a201-a204, B201-B204, S501-S503, and the like, the prediction result of the actual call drop rate time series can be represented as a relative time schedule of a switching time window, and on the basis of determining a second switching time window suitable for the target terminal to perform communication satellite switching, a specific switching time is determined according to the second switching time window and the relative time schedule, so that advantages of low predicted call drop rate and suitable switching time window can be combined, which is beneficial to obtaining a low call drop rate during actual switching, thereby obtaining good communication quality.
The communication satellite switching method in the present embodiment may be implemented by writing a computer program for implementing the communication satellite switching method in the present embodiment, writing the computer program into a computer device or a storage medium, and executing the communication satellite switching method in the present embodiment when the computer program is read out and run, thereby achieving the same technical effects as the communication satellite switching method in the present embodiment.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the descriptions of upper, lower, left, right, etc. used in the present disclosure are only relative to the mutual positional relationship of the constituent parts of the present disclosure in the drawings. As used in this disclosure, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, unless defined otherwise, all technical and scientific terms used in this example have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment, the term "and/or" includes any combination of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language ("e.g.," such as "or the like") provided with this embodiment is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, operations of processes described in this embodiment can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described in this embodiment (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described in this embodiment includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein.
A computer program can be applied to input data to perform the functions described in the present embodiment to convert the input data to generate output data that is stored to a non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.
Claims (10)
1. A communication satellite handoff method, the communication satellite handoff method comprising:
determining a source communication satellite and a destination communication satellite; the source communication satellite is a communication satellite which is currently connected with a target terminal, and the target communication satellite is a communication satellite which is switched to be connected with the target terminal;
acquiring an actual call drop rate time sequence; the actual call drop rate time sequence is a time sequence formed by recording the actual call drop rate and the actual switching moment when at least one communication terminal is switched from the source communication satellite to be connected with the target communication satellite;
predicting the actual call drop rate time sequence to obtain a predicted call drop rate time sequence; the predicted call drop rate time sequence comprises a plurality of predicted call drop rates and predicted switching moments corresponding to the predicted call drop rates;
selecting the minimum value of the predicted call drop rates;
and switching the target terminal from the source communication satellite to the target communication satellite at the predicted switching time corresponding to the minimum value.
2. The method of claim 1, wherein the obtaining the time series of actual call drop rates comprises:
when the communication terminal is switched from the source communication satellite to be connected with the target communication satellite, recording the actual switching time of the communication terminal;
and determining the actual call drop rate corresponding to the actual switching moment.
3. The method of claim 2, wherein the determining the actual call drop rate corresponding to the actual switching time comprises:
acquiring the total switching quantity and the successful switching quantity which are completed at the same actual switching moment; the total switching number is the total number of the communication terminals switched from the source communication satellite to be connected with the target communication satellite at the actual switching time, and the successful switching number is the number of the communication terminals normally obtaining the communication service of the target communication satellite after the switching is carried out at the actual switching time;
and taking the quotient of the difference between the total switching quantity and the successful switching quantity which are completed at the same actual switching time and the total switching quantity as the actual call drop rate corresponding to the actual switching time.
4. The method of claim 3, wherein said recording an actual handoff time of the communication terminal when the communication terminal is handed off from the source communication satellite to the destination communication satellite comprises:
determining a first switching time window corresponding to the process of switching the communication terminal from the source communication satellite to be connected with the destination communication satellite;
and determining the relative time progress in the first switching time window when the communication terminal is switched from the source communication satellite to be connected with the destination communication satellite as the actual switching time of the communication terminal.
5. The communication satellite switching method according to claim 4, wherein the switching of the target terminal from the source communication satellite to the destination communication satellite at the predicted switching time corresponding to the minimum value includes:
determining a second switching time window corresponding to the process of switching the target terminal from the source communication satellite to be connected with the target communication satellite;
determining a relative time progress in the second switching time window according to the predicted switching time corresponding to the minimum value;
and when the second switching time window is entered and the relative time progress is reached, switching the target terminal from the source communication satellite to the target communication satellite.
6. The method of claim 4, wherein determining a corresponding first handoff time window for the handoff of the communication terminal from the source communication satellite to the destination communication satellite comprises:
the communication terminal samples the signal intensity of the source communication satellite to obtain a first signal intensity value;
the communication terminal samples the signal intensity of the target communication satellite to obtain a second signal intensity value;
performing curve fitting on the sampling values of the first signal intensity value and the second signal intensity value to obtain a first curve;
and taking the time corresponding to one point on the first curve as the starting time of the first switching time window, and taking the time corresponding to the other point on the first curve as the ending time of the first switching time window, so as to determine the first switching time window.
7. The method of claim 5, wherein determining a corresponding second handoff time window for the handoff of the target terminal from the source communication satellite to the connection with the destination communication satellite comprises:
the target terminal samples the signal intensity of the source communication satellite to obtain a third signal intensity value;
the target terminal samples the signal intensity of the target communication satellite to obtain a fourth signal intensity value;
performing curve fitting on the sampling values of the third signal intensity value and the fourth signal intensity value to obtain a second curve;
and taking the time corresponding to one point on the second curve as the starting time of the second switching time window, and taking the time corresponding to the other point on the second curve as the ending time of the second switching time window, so as to determine the second switching time window.
8. The method according to any of claims 1-7, wherein the predicting the actual time series of dropped calls to obtain a predicted time series of dropped calls comprises:
performing prophet model modeling on the actual call drop rate time sequence;
and acquiring the predicted call drop rate time sequence output by the prophet model.
9. A computer apparatus comprising a memory for storing at least one program and a processor for loading the at least one program to perform the communications satellite handoff method of any of claims 1-8.
10. A storage medium having stored therein a program executable by a processor, wherein the program executable by the processor is configured to perform the communication satellite switching method according to any one of claims 1 to 8 when executed by the processor.
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