CN114726430A - Data transmission method based on satellite communication and satellite communication system - Google Patents
Data transmission method based on satellite communication and satellite communication system Download PDFInfo
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- H—ELECTRICITY
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- 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
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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
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
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- 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
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/02—Arrangements for increasing efficiency of notification or paging channel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application provides a data transmission method based on satellite communication and a satellite communication system, which are used for introducing a new position management strategy for UE (user equipment), so that the energy consumption problem of the UE in position management is obviously improved. The method comprises the following steps: after the UE is started, satellite over-jacking calculation is carried out, and the next satellite over-jacking time is determined; the UE determines the starting time adaptive to the satellite over-top time according to the satellite over-top time; the UE sends self terminal position information to the satellite ground station, so that the satellite ground station determines an adaptive access satellite according to the terminal position information and sends service data to the UE through the access satellite; and the UE enters a power-off state after the startup duration is reached, and is switched to the power-on state when the startup time is reached.
Description
Technical Field
The present invention relates to the field of satellite communications, and in particular, to a data transmission method based on satellite communications and a satellite communication system.
Background
In a non-stationary orbit satellite communication system, as a satellite moves at a high speed relative to the ground, the coverage area of the satellite to the ground changes in real time; meanwhile, in order to improve the coverage of the system, the coverage areas among the satellites tend to overlap to a certain degree. In this case, in order to ensure that data that needs to be sent to a User Equipment (UE) is accurate and reachable, the first problem to be solved is: when the UE moves, the satellite earth station (service control center) determines how to determine the access star of the UE, thereby ensuring that data can be accurately transmitted to the terminal through the access star.
Currently, in a main satellite communication system, a ground network such as MIP, MIPv6 and the like is mainly referred to for a mobility management technology of UE, and these technologies are based on centralized location management, that is, location information of UE is stored in a designated control center for management.
However, for the non-geostationary orbit satellite communication system, because each satellite moves relative to the ground all the time, the coverage area of the satellite changes constantly, the division of cells is complex, and the difficulty of UE position management is high; in addition, the technical scheme also requires the UE to perform position updating in the cross-region process, so that the aim of accurately sending data to the terminal access satellite is fulfilled, and the UE is required to be in a long-time startup use state, so that the problem of high energy consumption of the UE is caused.
Disclosure of Invention
The application provides a data transmission method based on satellite communication and a satellite communication system, which are used for introducing a new position management strategy for UE (user equipment), so that the energy consumption problem of the UE in position management is obviously improved.
In a first aspect, the present application provides a data transmission method based on satellite communication, including:
after the UE is started, satellite over-jacking calculation is carried out, and the next satellite over-jacking time is determined;
the UE determines the starting time adaptive to the satellite over-top time according to the satellite over-top time;
the UE sends self terminal position information to the satellite ground station, so that the satellite ground station determines an adaptive access satellite according to the terminal position information and sends service data to the UE through the access satellite;
and the UE enters a power-off state after the startup duration is reached, and is switched to the power-on state when the startup time is reached.
With reference to the first aspect of the present application, in a first possible implementation manner of the first aspect of the present application, the determining a next satellite over-vertex time by performing satellite over-vertex computation after the UE is powered on includes:
and after the UE is started, performing satellite over-jacking calculation according to the position of the UE and the newly received ephemeris, and determining satellite over-jacking time.
With reference to the first aspect of the present application, in a second possible implementation manner of the first aspect of the present application, the method further includes:
and the UE sends the starting time to the satellite ground station, so that the satellite ground station determines an adaptive access satellite according to the terminal position information and the starting time and sends service data to the UE through the access satellite.
With reference to the first aspect of the present application, in a third possible implementation manner of the first aspect of the present application, the determining, by the satellite ground station, an adaptive access satellite according to the terminal location information and sending service data to the UE through the adaptive access satellite includes:
when receiving terminal position information sent by UE, the satellite ground station searches whether target service data needing to be sent to the UE exists, wherein the target service data is configured in an offline message mode;
if yes, the satellite ground station extracts the carried time stamp T1 from the terminal position information;
the satellite ground station acquires a time stamp T2 indicating the current time;
the satellite ground station judges whether the time difference between the timestamp T1 and the timestamp T2 is smaller than the shortest starting time T of the UE;
if the terminal position information is less than the preset terminal position information, giving up determining an adaptive access satellite according to the terminal position information, sending service data to the UE through the adaptive access satellite, and waiting for the next time;
and if not, determining the adaptive access star according to the terminal position information and sending service data to the UE through the adaptive access star.
With reference to the first aspect of the present application, in a fourth possible implementation manner of the first aspect of the present application, the determining, by the satellite ground station, an adaptive access satellite according to the terminal location information and sending service data to the UE through the adaptive access satellite includes:
when target service data needing to be sent to the UE are received, the satellite ground station searches the target terminal position information which is sent by the UE most recently, and extracts a carried time stamp T1 from the target terminal position information;
the satellite ground station acquires a time stamp T2 indicating the current time;
the satellite ground station judges whether the time difference between the timestamp T1 and the timestamp T2 is smaller than the shortest starting time T of the UE;
if the terminal position information is less than the preset terminal position information, giving up determining an adaptive access satellite according to the terminal position information, sending service data to the UE through the adaptive access satellite, and waiting for the next time;
and if not, determining the adaptive access star according to the terminal position information and sending service data to the UE through the adaptive access star.
With reference to the first aspect of the present application, in a fifth possible implementation manner of the first aspect of the present application, the starting time point of the boot-up time is earlier than the satellite over-top time.
With reference to the first aspect of the present application, in a sixth possible implementation manner of the first aspect of the present application, the determining, by a satellite ground station, an adaptive access satellite according to terminal location information includes:
when target service data which needs to be sent to the UE exist, the satellite ground station determines an adaptive access satellite which is adaptive to the transmission reliability requirement of the target service data.
With reference to the sixth possible implementation manner of the first aspect of the present application, in a seventh possible implementation manner of the first aspect of the present application, the determining, by the satellite ground station, an adaptive access satellite adapted to a transmission reliability requirement of target service data includes:
if the target service data is the data with the first type in the transmission reliability requirement, the satellite ground station determines an adaptive access satellite based on a broadcast data transmission mode;
if the target service data is the data of the second type when the transmission reliability requirement is met, the satellite ground station initiates paging processing to the UE and determines an adaptive access satellite for obtaining paging response.
In a second aspect, the present application provides a satellite communication system, which includes a UE and a satellite ground station, to perform the method provided in the first aspect of the present application or any possible implementation manner of the first aspect of the present application.
In a third aspect, the present application provides a computer-readable storage medium storing a plurality of instructions, which are suitable for being loaded by a processor to perform the method provided in the first aspect of the present application or any one of the possible implementation manners of the first aspect of the present application.
From the above, the present application has the following advantageous effects:
aiming at the mobility management of UE under a satellite communication system, the method introduces an autonomous shutdown mechanism of the UE, the UE performs satellite over-pushing calculation after each startup, determines the next satellite over-pushing time, determines adaptive startup time according to the satellite over-pushing time and sends self terminal position information to a satellite ground station, so that the satellite ground station can determine an adaptive access satellite according to the terminal position information reported by the UE and sends service data to the UE through the adaptive access satellite, the UE enters a shutdown state after the startup time is reached and is switched to the startup state when the startup time is reached subsequently, the work is circulated, under the working mechanism, the UE is switched through intelligent startup and shutdown, under the condition of ensuring normal position management and satellite communication, the working time of the UE is greatly shortened, and the energy consumption problem of the UE in the position management is remarkably improved, the method is particularly suitable for application requirements of the satellite Internet of things, is suitable for the working characteristics of non-long startup and various moving characteristics of the satellite Internet of things terminal, and can avoid increasing the total overhead of the system to the maximum extent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a data transmission method based on satellite communication according to the present application;
fig. 2 is a flowchart of a process for transmitting service data from a satellite earth station to a UE;
fig. 3 is a flowchart illustrating another operation of the satellite earth station transmitting service data to the UE;
FIG. 4 is a signaling flow diagram of the paging process of the present application;
fig. 5 is a schematic view of a scene of the satellite-to-ground coverage feature of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Moreover, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus. The naming or numbering of the steps appearing in the present application does not mean that the steps in the method flow have to be executed in the chronological/logical order indicated by the naming or numbering, and the named or numbered process steps may be executed in a modified order depending on the technical purpose to be achieved, as long as the same or similar technical effects are achieved.
The division of the modules presented in this application is a logical division, and in practical applications, there may be another division, for example, multiple modules may be combined or integrated into another system, or some features may be omitted, or not executed, and in addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, and the indirect coupling or communication connection between the modules may be in an electrical or other similar form, which is not limited in this application. The modules or sub-modules described as separate components may or may not be physically separated, may or may not be physical modules, or may be distributed in a plurality of circuit modules, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present disclosure.
Next, a data transmission method based on satellite communication provided by the present application is described.
First, referring to fig. 1, fig. 1 shows a schematic flow chart of a data transmission method based on satellite communication according to the present application, and the data transmission method based on satellite communication according to the present application may specifically include the following steps S101 to S104:
step S101, after the UE is started, satellite over-jacking calculation is carried out, and the next satellite over-jacking time is determined;
it can be understood that the UE referred to in the present application is different types of terminal devices such as a smart phone, a Personal Digital Assistant (PDA) and the like in a satellite communication scenario, and in addition, in the satellite communication scenario, the UE may also be referred to as a device that is equipped with and carries the UE to perform contents of a satellite communication scheme related to the present application through the UE.
In practical application, under the condition of switching the basic and popular understood on-off state, the corresponding intelligent management strategy needs to be configured for the intelligent on-off state switching of the UE.
Specifically, after the UE is powered on each time, the next power-on time needs to be determined, and in the process, based on the basic effect of satellite communication, the power-on time needs to be considered to cover the satellite over-top time or overlap with the satellite over-top time, so that satellite communication can be performed with high satellite communication quality in the power-on time.
In this regard, the UE is required to perform a satellite over-thrust calculation to determine the next satellite over-thrust time (which is related to the next power-on time).
The UE may perform the satellite over-thrust calculation at the first time after the UE is powered on, for example, a default start-up is performed to trigger a relevant application program of the satellite over-thrust calculation to work, or the UE may perform the satellite over-thrust calculation after the UE is powered on for a certain time, for example, a 3 rd minute after the UE is powered on is set to trigger the relevant application program of the satellite over-thrust calculation to work.
The satellite over-thrust calculation is understood to be a calculation of the time (which may be called an over-thrust arc) when the satellite in the satellite communication system is located at a position (over-thrust) right above the UE.
In practical application, the UE autonomously performs the satellite over-thrust calculation, so that the UE has higher flexibility, and avoids a time-consuming problem (which may affect that the UE cannot enter a power-off state in time) that may be caused by handing over to other equipment to perform the satellite over-thrust calculation or calling the satellite over-thrust calculation result from other equipment.
As a practical implementation manner, the estimation processing of the satellite over-time by the UE may specifically include:
and after the UE is started, performing satellite over-jacking calculation according to the position of the UE and the newly received ephemeris, and determining satellite over-jacking time.
It can be understood that when calculating the position of the satellite directly above itself, the planned operation trajectory (ephemeris) of the newly updated satellite can be retrieved, and then the next satellite over-time can be locked by combining the position of itself.
The ephemeris is generally synchronized to the UE by the satellite communication system, but in some cases, the UE may actively request the satellite communication system.
In addition, when the satellite overtime is estimated, the self position of the related UE can not be changed or unchanged by default, and the current self position is used for estimating the satellite overtime; when a movement plan exists, the corresponding predicted self position can be determined by combining the predicted movement track, and the satellite over-top time can be estimated according to the predicted self position.
Step S102, the UE determines the starting time adaptive to the satellite over-top time according to the satellite over-top time;
after the next satellite overhead time is calculated, the UE may determine the adaptive boot time according to the determined next satellite overhead time.
As mentioned above, the turn-on time is required to cover or overlap the satellite over-time, so that the satellite over-time is included in the turn-on time, thereby enabling satellite communication with high satellite communication quality during the turn-on time and obtaining the highest satellite communication quality during the satellite over-time.
In yet another practical implementation, the starting time of the next power-on time determined here may be further specifically configured to be earlier than the next satellite over-time.
It can be understood that, since the UE is powered on at a time point earlier than the satellite passing time, better compatibility can be obtained, and if the current terminal position does not conform to the position corresponding to the satellite passing time calculated before due to the mobile characteristics of the terminal, or has a larger deviation from the position corresponding to the satellite passing time calculated before, there is a certain time to allow the position correction to reach a more accurate position corresponding to the satellite passing time, for example, the UE can be powered on 20 minutes before the estimated passing time, and recalculate the passing window according to the current self position.
Step S103, the UE sends self terminal position information to the satellite ground station, so that the satellite ground station determines an adaptive access satellite according to the terminal position information and sends service data to the UE through the access satellite;
at this time, the UE still does not enter the power-off state, and after power-on, on one hand, the next power-on time is calculated, and on the other hand, under the mobile location management policy configured in the present application, the UE can also send its own location information to the satellite ground station to complete one time of location update of the UE.
Therefore, at the satellite ground station side, the current UE in the starting state and the working state can be known, and the position of the UE can be updated on the system according to the terminal position information sent by the UE.
In the communication process, the satellite in the satellite communication link can be involved, the satellite on the sky forwards related information (data), and the reporting of the terminal position information can be performed according to a certain reporting period, for example, the terminal position information can be regularly reported for multiple times in the same starting time.
When the UE sends the terminal location information to the satellite ground station, the UE may directly perform the forwarding operation of the terminal location information through the corresponding satellite calculated by the satellite over the top, and for the satellite ground station, under the mobile location management mechanism of the UE, it may be considered to allocate an adapted access satellite for the UE, which is denoted as an adapted access satellite in this application.
The selection of the specific adaptive access satellite can be adjusted according to actual conditions, under the conditions that the satellite ground station has strong data calculation capacity, stable power supply and no energy consumption is needed to be considered, the selection of the adaptive access satellite by the satellite ground station can execute more flexible and more adaptive real-time condition processing, for example, when service data is sent to the UE, the predicted terminal position of the UE can be determined by considering the predicted movement track of the UE, and the adaptive access satellite can be selected.
Step S104, the UE enters a power-off state after the startup duration is reached, and is switched to the power-on state when the startup duration is reached.
It can be understood that the startup time of the UE related to the present application is the duration of the maintenance of the startup state, that is, the startup time, so that the UE completes the processing of determining the next startup time and reporting the terminal location information in the time range of the startup time after the startup, can be shut down after waiting for the startup time, monitors the time in the shutdown state, and can be restarted after the startup time of the previous calculation number is reached, and the data processing content is executed again.
For the content of the scheme, in the whole, aiming at the mobility management of the UE under a satellite communication system, the method introduces an autonomous shutdown mechanism of the UE, performs satellite over-pushing calculation after the UE is started each time, determines the next satellite over-pushing time, determines the adaptive startup time according to the satellite over-pushing time, and sends the terminal position information of the UE to a satellite ground station, so that the satellite ground station can determine an adaptive access satellite according to the terminal position information reported by the UE and send service data to the UE through the adaptive access satellite, the UE enters a shutdown state after the startup time is reached, and is switched to the startup state when the subsequent startup time is reached, the work is circulated, and under the working mechanism, the UE is switched on and off intelligently, so that the working time of the UE is greatly shortened under the condition of ensuring normal position management and satellite communication, the energy consumption problem of the UE in the position management is remarkably improved, the method is particularly suitable for the application requirement of the satellite Internet of things, the working characteristics of non-long startup and various moving characteristics of the satellite Internet of things terminal are adapted, and the increase of the total overhead of the system can be avoided to the maximum extent.
The steps of the embodiment shown in fig. 1 and the possible implementation manner thereof in practical application will be described in detail.
In the above, it can be further found that, when the satellite ground station transmits the service data to the UE, the computed on-time of the UE is unknown, that is, the satellite ground station transmits the service data to the UE without knowing the specific on-time of the UE.
Under the setting, the UE is determined to be in the starting state and the working state only by sending the terminal position information to the satellite ground station by the UE, and at the moment, the service data can be sent to the UE.
In actual operation, the satellite ground station may also perform the sending operation of the service data in combination with the startup time calculated by the UE, and at this time, the UE needs to actively feed back the calculated startup time.
Therefore, for the UE, the satellite ground station can also send the starting time to the satellite ground station, so that the satellite ground station determines the adaptive access satellite according to the terminal position information and the starting time and sends the service data to the UE through the access satellite.
Of course, in the above configuration, it is considered that in practical application, additional signaling cost is easily caused, in addition, the power-on time calculated and updated each time by the UE needs to be dynamically recorded, so that certain cost is brought to information management and information call, and complexity in data transmission is increased to a certain extent.
Therefore, the present application also provides another data transmission strategy, which can ensure that the satellite ground station can accurately determine the time for sending the service data to the UE, and can also ensure that the increased complexity of data transmission is at a lower level, even reaching the negligible step.
Specifically, a concept of a shortest boot time can be introduced for the UE, and the shortest boot time is a constraint condition for the UE when computing the boot time in practical application, that is, the boot time computed by the UE, the time span and the time range of the shortest boot time cannot be the shortest boot time.
First, position update driving type
As another practical implementation manner, for the satellite ground station side, when receiving the terminal location information sent by the UE, the satellite ground station searches whether there is target service data that needs to be sent to the UE, where the target service data is configured in the form of an offline message;
if yes, the satellite ground station extracts a carried timestamp T1 from the terminal position information (the time when the UE reports the position information can know that the terminal UE is in the power-on state at that time);
the satellite ground station acquires a time stamp T2 indicating the current time;
the satellite ground station judges whether the time difference between the timestamp T1 and the timestamp T2 (timestamp T2-timestamp T1) is less than the shortest starting time T of the UE;
if the terminal position information is less than the preset terminal position information, giving up determining an adaptive access satellite according to the terminal position information, sending service data to the UE through the adaptive access satellite, and waiting for the next time;
and if not, determining the adaptive access star according to the terminal position information and sending service data to the UE through the adaptive access star.
Specifically, the description may be further understood with reference to a work flow chart of the satellite ground station sending service data to the UE shown in fig. 2, where the satellite ground station is marked as a service control center in fig. 2, the service data is marked as station-to-end data, and a message is marked as an over-registration message.
It can be understood that in the location update driving type service data transmission mode, the satellite ground station triggers the transmission of the service data by reporting the terminal location information of the UE, so that the service data is fed back in a passive form along with the activity of the UE.
Second, of the traffic data-driven type
As another practical implementation manner, for the satellite ground station side, when receiving target service data that needs to be sent to the UE, the satellite ground station searches for target terminal location information that is newly sent by the UE, and extracts a timestamp T1 carried in the target terminal location information;
the satellite ground station acquires a time stamp T2 indicating the current time;
the satellite ground station judges whether the time difference between the timestamp T1 and the timestamp T2 is smaller than the shortest starting time T of the UE;
if the terminal position information is less than the preset terminal position information, giving up determining an adaptive access satellite according to the terminal position information, sending service data to the UE through the adaptive access satellite, and waiting for the next time;
and if not, determining the adaptive access star according to the terminal position information and sending service data to the UE through the adaptive access star.
Specifically, the present invention can also be understood by referring to another work flow chart of the satellite ground station sending service data to the UE shown in fig. 3, where the satellite ground station is denoted as a service control center in fig. 3, the service data is denoted as station-to-end data, and the terminal location information is denoted as over-registered information.
It can be understood that, in the service data driving type service data sending mode, the satellite ground station triggers the sending of the service data by acquiring new service data, so that the service data is sent in an active mode.
In addition, in another practical implementation manner, the selection of the adaptive access satellite may be specifically adjusted according to the type of the service data to be delivered, for example, when there is target service data to be sent to the UE, the satellite ground station determines the adaptive access satellite adapted to the transmission reliability requirement of the target service data.
Of course, in addition to the requirement of transmission reliability, in practical applications, the determination of the adapted access star may be performed according to other types of selection indexes, adaptation indexes, or even mixed indexes.
The transmission reliability may be specifically indicated by a signal quality on the communication link, where a higher signal quality means a higher transmission reliability, and the signal quality may be represented by a related parameter.
Further, based on the type index of the transmission reliability requirement, the service data is divided into two types, the first type is the service data with the lower transmission reliability requirement, for example, the service data with the smaller data volume, and the second type is the service data with the higher transmission reliability requirement.
If the target service data is the data with the first type in the transmission reliability requirement, the satellite ground station determines an adaptive access satellite based on a broadcast data transmission mode;
if the target service data is the data of the second type when the transmission reliability requirement is met, the satellite ground station initiates paging processing to the UE and determines an adaptive access satellite for acquiring paging response.
Under the setting, the specific selection scheme of the adaptive access satellite is determined by combining the specific difference of the reliability requirements, and whether paging processing is carried out or not can be selected in the actual operation, so that the flexibility in data transmission is further improved, the communication cost brought by the paging processing can be flexibly reduced, and the effective transmission and stable transmission of service data can be ensured.
The paging process according to the present application can be understood by referring to a signaling flow diagram of the paging process according to the present application shown in fig. 4.
The above may be better understood with respect to a set of examples below.
In the present application, motion conditions in a typical terminal speed scenario are considered, and a common mobile device is shown in table 1 below to determine a power-on policy and a location update policy of a terminal.
TABLE 1 common Mobile devices
| Common mobile device | Speed (km/h) |
| Electric vehicle | 15 |
| Cargo ship | 40 |
| Passenger transport for automobile | 80 |
| Fast train | 120 |
| High iron | 300 |
| Civil aviation | 900 |
And according to the orbit height of 800km, the diameter of a satellite coverage area is 2767km, and the coverage arc length is 2789 km.
1. Determining boot policies
For a non-long-time starting terminal, the terminal usually performs top pushing calculation according to the current self position and broadcast ephemeris before the terminal is turned off, and determines the next starting time, but because of the moving characteristic of the terminal, the calculation window is most likely to have deviation, so the terminal can be started 20 minutes before the calculated top-passing time, and the top-passing window is recalculated according to the current self position.
2. Determining the position updating period and reporting the position information periodically
Satellite-to-ground coverage characteristics as shown in fig. 5, which is a scene diagram of the satellite-to-ground coverage characteristics of the present application, the satellite reliability coverage area is calculated according to known conditions, see table 2 below.
TABLE 2 reliability coverage area
The ratio of the terminal moving range to the satellite coverage range is as follows: smaller values represent a more limited range of terminal movement relative to the satellite beam, and the higher the probability of success of the satellite broadcasting the downlink data.
The moving half arc length of the terminal is calculated according to the table 2, and the corresponding movement time of the terminal with different speeds is shown in the following table 3.
TABLE 3 theoretical calculation of location update frequency
| The ratio of the terminal moving range to the satellite coverage range | 10％ | 5％ | 3％ |
| Low-speed mobile terminal | 11 hours | 7.5 hours | 6 hours |
| Medium-speed mobile terminal | 2.2 hours | 1.5 hours | 1.2 hours |
| High-speed mobile terminal | 29 minutes | 20 minutes | 16 minutes |
Here, the location updates are sent on a frequency not lower than the frequency in table 3 where the terminal movement range is 10% of the satellite coverage.
3. Service control center judges whether or not (satellite earth station) can transmit station-to-end data
The service control center may specifically perform the determination according to the contents shown in fig. 2 and fig. 3.
4. Initiating paging and determining access star
The specific content of the paging process can also refer to the content shown in fig. 4, which corresponds to:
1) a service control center initiates a paging request to a User (UE), and the transmitted target satellites are all satellites capable of covering the user;
2) after listening to the paging request, the user performs handshake with the satellite;
3) when the handshake between the user and the satellite is successful, sending a paging response to a service control center;
4) and if the operation and control center receives the paging response, determining the access satellite of the user according to the original address satellite of the paging response.
In addition, from the perspective of a hardware structure, the present application also provides a satellite communication system, where the satellite communication system includes a UE and a satellite ground station, and further may also include related equipment in a satellite communication scenario, such as a satellite.
The satellite communication system specifically executes the following contents through the UE and the satellite ground station:
after the UE is started, satellite over-jacking calculation is carried out, and the next satellite over-jacking time is determined;
the UE determines the starting time adaptive to the satellite over-top time according to the satellite over-top time;
the UE sends self terminal position information to the satellite ground station, so that the satellite ground station determines an adaptive access satellite according to the terminal position information and sends service data to the UE through the access satellite;
and the UE enters a power-off state after the startup duration is reached, and is switched to the power-on state when the startup time is reached.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the satellite communication system described above may refer to the description of the data transmission method based on satellite communication in the corresponding embodiment of fig. 1, and details are not described herein again.
It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor.
For this reason, the present application provides a computer-readable storage medium, in which a plurality of instructions are stored, where the instructions can be loaded by a processor to execute the steps of the data transmission method based on satellite communication in the embodiment corresponding to fig. 1 in the present application, and specific operations may refer to the description of the data transmission method based on satellite communication in the embodiment corresponding to fig. 1, which is not repeated herein.
Wherein the computer-readable storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
Since the instructions stored in the computer-readable storage medium can execute the steps of the data transmission method based on satellite communication in the embodiment corresponding to fig. 1, the beneficial effects that can be achieved by the data transmission method based on satellite communication in the embodiment corresponding to fig. 1 can be achieved, which are detailed in the foregoing description and are not repeated herein.
The data transmission method based on satellite communication, the satellite communication system and the computer readable storage medium provided by the present application are introduced in detail, and a specific example is applied in the present application to explain the principle and the implementation of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A method for transmitting data based on satellite communication, the method comprising:
after a user terminal UE is started, satellite over-jacking calculation is carried out, and the next satellite over-jacking time is determined;
the UE determines the starting time adaptive to the satellite over-top time according to the satellite over-top time;
the UE sends self terminal position information to a satellite ground station, so that the satellite ground station determines an adaptive access satellite according to the terminal position information and sends service data to the UE through the access satellite;
and the UE enters a power-off state after reaching the power-on duration and is switched to the power-on state when reaching the power-on time.
2. The method of claim 1, wherein the determining the next satellite over-top time by performing a satellite over-top calculation after the UE is powered on comprises:
and after the UE is started, performing satellite over-jacking calculation according to the position of the UE and the newly received ephemeris, and determining the satellite over-jacking time.
3. The method of claim 1, further comprising:
and the UE sends the starting time to the satellite ground station, so that the satellite ground station determines the adaptive access satellite according to the terminal position information and the starting time and sends service data to the UE through the access satellite.
4. The method of claim 1, wherein the satellite earth station determines an adaptive access satellite according to the terminal location information and sends the service data to the UE through the adaptive access satellite, and wherein the method comprises:
when receiving the terminal position information sent by the UE, the satellite ground station searches whether target service data needing to be sent to the UE exists, wherein the target service data is configured in an offline message mode;
if yes, the satellite ground station extracts a carried time stamp T1 from the terminal position information;
the satellite ground station acquires a timestamp T2 indicating the current time;
the satellite ground station judges whether the time difference between the timestamp T1 and the timestamp T2 is less than the shortest starting-up time T of the UE;
if the terminal position information is less than the preset terminal position information, the adaptive access satellite is abandoned, and the service data is sent to the UE through the adaptive access satellite for waiting for the next time;
and if not, determining the adaptive access satellite according to the terminal position information and sending the service data to the UE through the adaptive access satellite.
5. The method of claim 1, wherein the determining, by the satellite earth station, an adaptive access satellite according to the terminal location information and sending service data to the UE through the adaptive access satellite comprises:
when target service data needing to be sent to the UE are received, the satellite ground station searches the target terminal position information which is sent by the UE most recently, and extracts a carried time stamp T1 from the target terminal position information;
the satellite ground station acquires a timestamp T2 indicating the current time;
the satellite ground station judges whether the time difference between the timestamp T1 and the timestamp T2 is less than the shortest starting-up time T of the UE;
if the terminal position information is less than the preset terminal position information, the adaptive access satellite is abandoned, and the service data is sent to the UE through the adaptive access satellite for waiting for the next time;
and if not, determining the adaptive access satellite according to the terminal position information and sending the service data to the UE through the adaptive access satellite.
6. The method of claim 1, wherein the start time of the boot-up time is earlier than the satellite over-time.
7. The method of claim 1, wherein the satellite earth station determines an adaptive access satellite according to the terminal location information, comprising:
and when target service data which needs to be sent to the UE exist, the satellite ground station determines the adaptive access satellite which is adaptive to the transmission reliability requirement of the target service data.
8. The method of claim 7, wherein the satellite earth station determining the adapted access satellite adapted to the transmission reliability requirement of the target traffic data comprises:
if the target service data is the data of the first type in the transmission reliability requirement, the satellite ground station determines the adaptive access satellite based on a broadcast data transmission mode;
and if the target service data belongs to the second type of data in the transmission reliability requirement, the satellite ground station initiates paging processing to the UE and determines the adaptive access satellite acquiring paging response.
9. A satellite communication system, characterized in that it comprises user terminals UE and satellite ground stations to perform the method of any of claims 1 to 8.
10. A computer readable storage medium, having stored thereon a plurality of instructions adapted to be loaded by a processor to perform the method of any one of claims 1 to 8.
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