CN113965243B - Low-orbit satellite communication method, device, electronic equipment and storage medium - Google Patents
Low-orbit satellite communication method, device, electronic equipment and storage medium Download PDFInfo
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Abstract
The embodiment of the invention discloses a low-orbit satellite communication method, a device, electronic equipment and a storage medium, which are applied to at least one party of equipment participating in the low-orbit satellite communication. Wherein the method comprises the following steps: establishing power change data locally; and controlling the transmission and/or the reception of signals according to the power variation data. According to the technical scheme provided by the embodiment of the invention, the transmission and receiving control of the signal is associated with the power change condition through calculation and prediction of the power change condition, so that the success rate of signal receiving and transmitting is effectively ensured, and the communication quality is improved.
Description
Technical Field
The present invention relates to the field of satellite communications technologies, and in particular, to a low-orbit satellite communications method, apparatus, electronic device, and computer readable storage medium.
Background
The rapid development of digital mobile communication brings a new driving force for the production and life of human society, wherein terrestrial cellular network technology is the main access type of mobile communication at present, and evolves along the speed of every ten years. For example, around 2020, 5 th generation (5G) mobile networks have first initiated deployment in some developed countries and regions, bringing users up to 10GBps communication speeds.
However, in some less developed countries and regions, access and upgrades to mobile communication services are still not possible within a short period of time. This is mainly due to the fact that local communication network infrastructure is built at a later level, for example in a wide african area, and still hundreds of millions of people cannot access internet services. The prior art also attempts to provide wireless access services using aerial platforms, such as stratospheric aircraft (HAPS) or satellite systems, to circumvent the relatively heavy ground infrastructure construction. However, attempts at stratospheric aircrafts have not been put into practical operation for a variety of reasons; the use of satellite systems to provide wireless communication directly to the ground is mature.
Among them, based on the type of satellite orbit, two methods are further classified into the use of geosynchronous satellites (GEO) and the use of low-medium orbit (LEO) satellites. The geostationary satellite can keep earth stationary at a height of about 3600 km above the equatorial orbit and provide wireless access services, but its orbit is more limited, and the system capacity of the communication system is limited and the service area cannot be covered in a high-dimensional area.
While medium-low orbit satellites, though not relatively stationary with the earth, can theoretically achieve global coverage by way of constellations. And because the capacity of the wireless communication system is determined by the frequency reuse factor, LEOs closer to the earth's surface can provide more communication capacity than GEO.
Although constructing a global covered, high capacity communication system using LEO constellations can quickly provide wireless access capability to such less developed areas. However, establishing a wireless link between a high-speed moving satellite and a ground terminal also faces a number of technical challenges, one of which is typically the negative impact of the high speed movement of the low-orbit satellite relative to the ground on the rate of signal transmission and reception and communication.
Specifically, since the satellite communication frequency is in the KA or KU band, the path loss of the band is large, and the ground side cannot obtain effective reception power without beamforming the radio wave using a phased array antenna. The use of beam forming means that the power of the signal transmitted by the satellite is stronger in the central area of the beam and weaker in the surrounding area, on one hand, when multi-user access exists, the satellite cannot flexibly adjust the beam direction or the transmitting power according to the requirement of each user; on the other hand, in the satellite motion process, the receiving power of the ground end has larger fluctuation, and the changed receiving power means the improvement of the packet error rate, even the loss of a link, and seriously influences the user experience.
Disclosure of Invention
Aiming at the technical problems in the prior art, the embodiment of the invention provides a low-orbit satellite communication method, a device, electronic equipment and a storage medium, which are used for solving the problem that the ground-side receiving quality is affected due to the high-speed movement of satellites.
A first aspect of an embodiment of the present invention provides a low-orbit satellite communication method, which is applied to at least one party device participating in the low-orbit satellite communication, and includes: establishing power change data locally; and controlling the transmission and/or the reception of signals according to the power variation data.
In some embodiments, the power change data is a corresponding change in received power and/or path loss in at least one path of the low-orbit satellite communication at different points in time.
In some embodiments, the received power and/or path loss is an absolute or relative value at different points in time.
In some embodiments, the time points are in units of communication frames or super communication frames, and/or the time points are associated with absolute time.
In some embodiments, the method further comprises:
the received power and/or path loss at the same time point is measured over a plurality of periods and averaged or weighted averaged to take the average value as the power change data at the time point.
In some embodiments, the power change data is downlink-specific, uplink-specific, or both downlink and uplink-specific.
In some embodiments, the method further comprises:
synchronization of the power change data is maintained in a plurality of devices engaged in the low-orbit satellite communication.
In some embodiments, the method further comprises:
after the data synchronization is completed, any one of the devices controls the transmission and/or reception of the signals, or each of the devices controls itself according to the synchronization data.
In some embodiments, the transmitting and/or receiving of the data control signal according to the power variation comprises:
predicting the received power and/or path loss at any moment according to the power change data;
the transmission and/or reception opportunities of the signal are calculated and determined from the predicted reception power and/or path loss.
In some embodiments, the power variation data also includes a plurality of received power and/or path loss information corresponding to different frequencies and/or beams.
In some embodiments, the method further comprises:
and selecting a specific frequency and/or beam according to the power variation data to formulate a transmitting and/or receiving strategy of the signal.
A second aspect of an embodiment of the present invention provides a low-orbit satellite communication apparatus, which is at least one device participating in the low-orbit satellite communication, including:
the data establishing module is used for locally establishing power change data;
and the control module is used for controlling the sending and/or receiving of signals according to the power change data.
In some embodiments, the power change data is a corresponding change in received power and/or path loss in at least one path of the low-orbit satellite communication at different points in time.
In some embodiments, the received power and/or path loss is an absolute or relative value at different points in time.
In some embodiments, the time points are in units of communication frames or super communication frames, and/or the time points are associated with absolute time.
In some embodiments, the power change data is downlink-specific, uplink-specific, or both downlink and uplink-specific.
In some embodiments, the data creation module further comprises:
and the average value calculation module is used for measuring the received power and/or the path loss at the same time point in a plurality of periods and carrying out average or weighted average, and taking the average value as power change data at the time point.
In some embodiments, the apparatus further comprises:
and the data synchronization module is used for keeping the synchronization of the power change data in a plurality of devices participating in the low-orbit satellite communication.
In some embodiments, after data synchronization is completed, the control of the transmission and/or reception of the signal is performed by either party device, or the control is performed by each party device on its own in accordance with the synchronization data.
In some embodiments, the control module includes:
a prediction module, configured to predict a received power and/or a path loss at any time according to the power change data;
and the occasion determining module is used for calculating and determining the sending and/or receiving occasions of the signals according to the predicted receiving power and/or path loss.
In some embodiments, the power variation data also includes a plurality of received power and/or path loss information corresponding to different frequencies and/or beams.
In some embodiments, the control module further comprises:
and the strategy determining module is used for selecting a specific frequency and/or beam according to the power change data to formulate a sending and/or receiving strategy of the signal.
A third aspect of an embodiment of the present invention provides an electronic device, including:
a memory and one or more processors;
wherein the memory is communicatively coupled to the one or more processors, and instructions executable by the one or more processors are stored in the memory, which when executed by the one or more processors, are operable to implement the methods as described in the previous embodiments.
A fourth aspect of embodiments of the invention provides a computer-readable storage medium having stored thereon computer-executable instructions which, when executed by a computing device, are operable to implement the method of the previous embodiments.
A fifth aspect of embodiments of the present invention provides a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are operable to carry out the method as described in the previous embodiments.
The embodiment of the invention correlates the sending and receiving control of the signal with the power change condition through calculating and predicting the power change condition, thereby effectively ensuring the success rate of signal receiving and transmitting and improving the communication quality.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 is a schematic diagram of an exemplary low-orbit satellite constellation according to some embodiments of the present invention;
FIG. 2 is a schematic diagram of an exemplary two-way communication based on low-orbit satellites, according to some embodiments of the invention;
FIG. 3 is a schematic diagram illustrating a typical low-orbit satellite as it moves relative to a ground terminal, according to some embodiments of the invention;
FIG. 4 is a flow chart of a method of low-orbit satellite communication according to some embodiments of the invention;
5A-5E are schematic diagrams of representations of power change data according to some embodiments of the invention;
FIG. 6 is a block diagram of a low-orbit satellite communication device according to some embodiments of the invention;
fig. 7 is a schematic diagram of an electronic device shown in accordance with some embodiments of the invention.
Detailed Description
In the following detailed description, numerous specific details are set forth by way of examples in order to provide a thorough understanding of the relevant disclosure. However, it will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. It should be appreciated that the terms "system," "apparatus," "unit," and/or "module" are used herein to describe various elements, components, portions or assemblies in a sequential order. However, these terms may be replaced with other expressions if the other expressions can achieve the same purpose.
It will be understood that when a device, unit, or module is referred to as being "on," "connected to," or "coupled to" another device, unit, or module, it can be directly on, connected to, or coupled to, or in communication with the other device, unit, or module, or intervening devices, units, or modules may be present unless the context clearly indicates an exception. For example, the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the invention. As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only those features, integers, steps, operations, elements, and/or components that are explicitly identified, but do not constitute an exclusive list, as other features, integers, steps, operations, elements, and/or components may be included.
These and other features and characteristics of the present invention, as well as the methods of operation and functions of the related elements of structure, the combination of parts and economies of manufacture, may be better understood with reference to the following description and the accompanying drawings, all of which form a part of this specification. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the invention. It will be understood that the figures are not drawn to scale.
Various block diagrams are used in the description of the various embodiments according to the present invention. It should be understood that the foregoing or following structures are not intended to limit the present invention. The scope of the invention is defined by the appended claims.
The low orbit satellites realize global coverage by forming a constellation way, thereby providing wireless communication capability for the ground end of the world. As shown in fig. 1, a typical low-orbit satellite constellation consists of multiple orbits, each orbit having a plurality of low-orbit satellites operating therein, the low-orbit satellites providing wireless access services to an area of the ground via communication links. Because of the orbital altitude problem, each satellite in the constellation remains moving at a high speed relative to the ground, and thus the area covered by its communication link changes over time. Fig. 2 further shows a schematic diagram of a typical satellite providing a radio access service to the ground, where carrier frequencies of communication links between the low-orbit satellite and gateway stations and between the low-orbit satellite and ground terminals may be KA, KU, V-band radio signals, so as to solve the problem of large path loss, and the low-orbit satellite sends and receives radio signals to the ground through beamforming implemented by a phased array antenna array. In fig. 2, the ground terminal and the low-orbit satellite communicate bidirectionally via a service link, and the low-orbit satellite and the ground gateway station communicate bidirectionally via a feeder link. Among them, in current product implementations, the ground terminals are typically semi-static devices equipped with parabolic antennas, which are relatively fixed in position during most of the time of use. In a specific operation, as shown in fig. 3, the satellites move along a fixed route relative to the ground terminal, and since the low-orbit satellite is a low-cost communication satellite with only fixed beam capability, the direction of the beam cannot be flexibly adjusted during the movement, and thus, from the perspective of a ground receiving end, a signal sent by one low-orbit satellite can undergo a process of power from low to high and then from high to low. This power variation is very disadvantageous for communication systems because the received power determines the success rate of data packet demodulation, whereas the varying received power means an increase in packet error rate, even loss of links, and poor system stability. From a user experience perspective, the link is unstable and the communication quality, which is good and bad, is very bad for instant class applications.
Therefore, in the embodiment of the invention, the sending and receiving control of the signal is associated with the power change condition through the calculation and the prediction of the power change condition, thereby effectively ensuring the success rate of signal sending and receiving and improving the communication quality.
It can be found from the study of the operation rule of the low-orbit satellite that, compared with the ground communication system, the channel conditions of the satellite and the ground terminal have a direct path (LOS) with amplitudes distributed according to rice distribution (riceinfiguration). The received power of the direct path satisfies the free space fading model, and thus the path loss is mainly related to the linear distance of the low-earth satellite and the ground terminal. Furthermore, beamforming has different gains in different directions, which are related to the beam center direction and the satellite-to-ground terminal straight angle. Because several key conditions affecting the received power can be quantitatively measured and calculated, the change of the received power of the low-orbit satellite becomes more regular, i.e. more predictable, than the random change of the power of the ground cellular network, so that the technical scheme of the embodiment of the invention has theoretical feasibility.
In particular operation, as shown in fig. 3, the satellites move in a fixed path relative to the ground terminal, while the satellite orbit is circular, but moves approximately parallel to the ground in a short period of time. The link path loss between the satellite and the ground terminal at three typical moments T1, T2, T3, i.e. the ratio Pr/Pt of received power to transmitted power, depends on the distance between the low-orbit satellite and the terminal and the beamforming gain of the beamforming in the straight direction. During the whole process of the satellite scanning the ground terminal, the ground terminal receiving power is subjected to the process of going from low to high and then going from high to low. Compared with the complex channel environment of the base station and the ground terminal for ground communication, the channel between the low-orbit satellite and the ground terminal is continuously changed, but the change is stable, and mainly because the channel between the satellite and the terminal has a direct path with stronger power, and the motion trail of a plurality of satellites on the same orbit of a constellation is basically the same. Therefore, the predictable and variable path loss can realize more accurate power and transmission control through the technical scheme of the embodiment of the invention, so as to improve the reliability of a link and the power efficiency of equipment.
As shown in fig. 4, the low-orbit satellite communication method in one embodiment of the present invention includes:
s401, power change data is established locally.
Wherein in an embodiment of the invention, the low-orbit satellite communication process is jointly participated by a plurality of communication devices, and the power change data is established in at least one party device participating in the communication. Specifically, the low-orbit satellite communication process is at least jointly participated by a satellite side and a ground side, wherein the satellite side comprises at least one low-orbit satellite, and the ground side comprises at least one ground terminal; ground terminals are typically semi-stationary devices equipped with parabolic antennas, but with the miniaturization of the devices, ground terminals may also include mobile handsets in the future, and possibly even all mobile terminals (i.e. not including stationary/semi-stationary set-up terminals).
In one embodiment of the invention, the power change data is indicative of a corresponding change in received power or path loss at different points in time in the low-orbit satellite communication path. Optionally, the locally established power change data includes a power change relation in at least one communication path of the current device; further may include power change relationships in all possible paths for the current device or power change relationships in all paths for all devices. Taking a ground terminal as an example, the established power variation data at least includes a power variation relation of a communication path with a low-orbit satellite, such as the ground terminal in fig. 3, and at least establishes a variation curve/function of a receiving power or a path loss of the communication path with the low-orbit satellite in the fig. at the time of T1-T3.
S402, controlling the sending and/or receiving of signals according to the power change data.
In conventional communication methods, the transmission (and reception) of signals is typically controlled by pilot signals (e.g., random access pilots), which are typically generated based on received power or path loss measured in real time, and are applicable to most mobile communication scenarios. However, in the satellite communication process, the time delay effect caused by the long communication distance is large, and if a real-time measuring and calculating mode is still adopted, the actual effective data receiving and transmitting time is seriously shortened, so that the influence on the communication quality is extremely large. In an embodiment of the invention, the transmission and/or reception of signals is controlled according to pre-established power variation data; compared with the real-time measuring and calculating mode in the prior art, the technical scheme of the invention utilizes the power change data to calculate the accessed sending time and/or power according to the predicted receiving power or path loss, thereby effectively improving the communication quality.
In one embodiment of the present invention, the power change data is an absolute value or a relative value of power or path loss at different time points. Preferably, the different points in time are in units of communication frames or super communication frames. A schematic diagram of a plurality of super communication frames (hereinafter referred to as super frames) and normal communication frames (hereinafter referred to as normal frames or frames) is given in fig. 5A, wherein one super frame may contain a plurality of normal frames; each super frame or each common frame has an association number, and the specific association number is recycled in a predetermined range. Fig. 5B and fig. 5C further show power change data corresponding to the super frame and the normal frame, where the super frame and the normal frame are respectively numbered consecutively, and each super frame and each normal frame in the power change data corresponds to a specific path loss value, so as to represent possible power conditions in the communication path at a time point corresponding to the super frame or the normal frame (i.e. represent prediction of the power condition at the time point). Of course, it will be understood by those skilled in the art that the signal reception power value may be used instead of the path loss value. The power change data can reflect the path fading change of the communication link between the satellite and the ground terminal in a large scale or a small scale through the length setting of different frames or super frames.
Absolute value information, such as absolute path loss values or absolute received power values, is given in the embodiments of fig. 5B and 5C; in one embodiment of the invention, the power change data may also be represented by a relative change value, such as by a path loss difference or a power difference between adjacent one or more normal frames/super frames. Taking the ground terminal and satellite link of fig. 3 as an example, when the satellite moves in orbit and sweeps the ground terminal, the ground terminal appears from low to high and then from high to low in the change of the received power, so the power change data can be the path loss difference or the power difference of two stages; wherein, from the stage T1 to the stage T2, the difference is a positive value; from the T2 to T3 stage, the difference is negative. Further, the power difference can be divided into more stages in a period of one satellite scanning, and only one difference data exists in each stage; for example, fig. 5D further uses two frames as a phase, each phase being associated with a difference value, e.g., frame #2 power-frame #1 power=3 dB, frame #3 power-frame #2 power=3 dB; frame M power-frame M-1 power = -2dB.
In one embodiment of the invention, the power change data is obtained by a satellite and sent to a ground terminal, and the ground terminal receives and stores the related information; preferably, the satellite can obtain the power change data by monitoring the received power or the path loss data reported by the ground terminal.
In another embodiment of the invention, the power change data is measured by the ground terminal and stored directly locally. The ground terminal obtains the received power or the path loss information at different time points and associates the received power or the path loss with different time points. The time points may be the numbers of the frames or super frames shown in fig. 5A, and the numbers corresponding to the different time points are different. Preferably, frames or super frames within one period of satellite operation are continuously numbered, and the numbers are cyclically used from the beginning in the next period; thus, the same numbered frames or super frames within each period may be considered the same point in time; and frames or super frames with different numbers are considered to be different time points whether they are in the same period or belong to different periods. Alternatively, the ground terminal may measure the received power or path loss at the same time point (such as the same numbered frame or super frame) for a plurality of periods and average or weight average the received power or path loss as the power change data at the time point.
By the mode, the ground terminal finally obtains the power change data associated with the time point. The received power or the path loss in the embodiment of the invention can be aimed at the downlink, but can also be aimed at the uplink, or the power change data of the downlink and the uplink can be recorded at the same time. For example, the received power of each frame/super frame in fig. 5B and fig. 5C may be the received power of the satellite signal received by the ground terminal, or the received power of the satellite signal received by the ground terminal when the ground terminal transmits the signal with a certain transmission power, and the received power of the satellite side (i.e. uplink) may be measured and recorded by the satellite.
After the power change data is obtained, the locally stored power change data may be further used for signal transmission and/or reception control. In the embodiment of the invention, the power change data can be established in at least one party device participating in communication, so that the at least one party device participating in communication can also perform signal transmission and/or receiving control. In a preferred embodiment of the present invention, the synchronization of the power change data can be maintained in the plurality of devices on the ground terminal and satellite sides, that is, one and the same power change data in each of the plurality of devices; accordingly, after the data synchronization is completed, any one of the parties may perform signal transmission and/or reception control, or each party may perform control according to the synchronization data.
After obtaining the power change data, the terminal can calculate the received power or path loss at any time according to the information at the other time. For example, a 550km orbital low earth satellite may be 600km from the ground terminal at time T1, and the signal may be delayed for up to 4ms in both directions. If the time length of a frame is 1ms, the satellite will get the data packet of the ground terminal after sending an instruction through a frame at least after 5 ms. While other flows requiring multiple exchanges of information may imply longer delays. In one case, the ground terminal needs to transmit an uplink signal at a target received power, such as transmitting a random access pilot to access a satellite that has just been identified. The ground terminal recognizes the satellite by its downlink signal and obtains the received power or path loss by the reference signal (signaling indication transmission by satellitePower and then combined with the received power). At this time, the ground terminal may calculate the opportunity and/or power of the random access transmission according to the power variation data. That is, the ground terminal does not perform transmission of the random access pilot according to the currently measured received power or path loss, but calculates according to the predicted received power or path loss. The specific calculation process is P r For the current downlink received power, P Tar For uplink signal target received power, PL is the currently measured path loss. The point in time of transmitting the uplink signal satisfies:
P T +PL e ≥P Tar ；
wherein P is T For the transmit power, it may generally be calculated as the maximum achievable transmit power for the transmitting terminal; PL (PL) e For predicted path loss, it can be derived from PL and power variation data.
For example, one ground terminal measures PL as-100 dB, P T 30dB and P Tar 5dB; here, the power includes gains due to beamforming of the satellite side and the ground terminal. In the traditional way, when the terminal continuously measures PL until-25 dB, the random access pilot frequency is sent again, namely PL e = -25dB. By adopting the technical scheme of the embodiment of the invention, the ground terminal is based on the power change data and PL= -100dB and PL e Optimal transmit frame (i.e., time point) is estimated by = -25dB, e.g., frame X is calculated to satisfy PL based on accumulated power difference e The terminal may send a random access pilot directly at frame X or re-measure PL of frame X at frame X.
It should be understood by those skilled in the art that, although the foregoing embodiment controls signal transmission by means of random access pilot, the technical solution of the embodiment of the present invention may obviously be applicable to other types of channels, such as uplink shared data channel PUSCH, uplink control channel PUCCH, uplink reference signal, etc., and the description of the foregoing embodiment should not be regarded as specific limitation on the implementation of signal control in the technical solution of the present invention.
The above embodiment describes a manner of calculating the uplink signal transmission timing by reusing the power variation data based on the measured downlink power. In another embodiment of the present invention, the ground terminal may select the optimal uplink transmission opportunity only according to the power change data, for example, in a simplest implementation manner: according to the corresponding relation between the power and the super frame as shown in fig. 5, the terminal initiates an access request in only a subset of the super frames; the path loss or the receiving power of each frame in the selected subset is smaller, and the probability of success of the access is higher. The mode of the preferred embodiment is more beneficial to the ground terminal of the low-power-consumption Internet of things, and because the ground terminal selects the optimal time according to the power change data, namely, the satellite is accessed to the satellite at the time closest to the ground and/or the wave beam gain is maximum, the ground terminal adopting the mode can select to use non-full power to transmit uplink signals, so that the power consumption of the ground terminal can be effectively reduced.
As further shown in fig. 5E, according to the power change data locally stored in the ground terminal, especially according to the received power or path loss information thereof, the ground terminal may determine that the satellite side may not successfully receive the data packet even if the signal is transmitted at full power in the first period (super frame #1, super frame #2, super frame # 3); meanwhile, the ground terminal judges that if full power is used for transmission in a second time period (super frame #M and super frame M+1), the satellite side can successfully receive the data packet; further, the ground terminal also determines that the path loss is minimum in the third time period (super frame #n, super frame #n+1), and can transmit signals with smaller power. Therefore, the ground terminal side can select the optimal transmission timing according to the power change data. Of course, it should be understood by those skilled in the art that although the above embodiments are exemplified by the ground terminal side, the control method is equally applicable to the satellite side, that is, the satellite side may also control the use of non-full power transmission signals according to the power change data, so as to reduce the power consumption of the device.
In a preferred embodiment of the invention, the low-orbit satellite and ground communication link comprises a plurality of channels or beams distributed over different frequencies. The power change data may include a plurality of received power or path loss information corresponding to different frequencies or beams. According to the power change data, the ground terminal or the satellite side can not only select the sending time, but also select specific frequency and wave beam at the same time to formulate a sending strategy.
In one embodiment of the invention, the time points (frames/super frames) in fig. 5A-5E may also be associated with absolute time. The period of the low orbit satellite is relatively fixed, so that the time point of one satellite which scans a certain ground terminal is relatively fixed in different periods, and accurate prediction can be performed in advance according to the operation rule or the planning. Thus, in the preferred embodiment of the present invention, the frame/super frame number can be associated with the absolute time, and the ground terminal can obtain the received power or path loss information associated with the absolute time according to the power change data, so that a unified and accurate transmission strategy can be formulated according to the absolute time.
In one embodiment of the invention, the ground terminal may also formulate a signal reception strategy based on the power variation data. For example, the ground terminal may calculate an optimal satellite identification opportunity based on the path loss information associated with the frame or super frame, such as by scanning the downlink signal to identify the presence of satellites. In addition, the satellite side can also formulate a signal sending or receiving strategy according to the power change data. For example, the satellite may choose to send the scheduling signaling of the terrestrial terminal uplink signal at the time when the path loss is minimal or the satellite receives the strongest frame (while taking into account the bi-directional transmission delay); at this time, the signal of the terminal will be received with an optimal reception success rate. Alternatively, in this way the terminal can transmit signals with the highest modulation coding order, thereby maximizing the communication rate.
The above is a specific embodiment of the low-orbit satellite communication method provided by the invention.
Fig. 6 is a schematic diagram of a low-orbit satellite communication device according to some embodiments of the present disclosure. In an embodiment of the invention, the low-orbit satellite communication process is jointly participated by a plurality of communication devices, in particular, the low-orbit satellite communication process is jointly participated by at least a satellite side and a ground side, the satellite side comprises at least one low-orbit satellite, and the ground side comprises at least one ground terminal. As shown in fig. 6, the low-orbit satellite communication apparatus 600 is at least one device participating in the low-orbit satellite communication, and includes:
a data establishing module 601, configured to locally establish power variation data;
a control module 602, configured to control transmission and/or reception of signals according to the power variation data.
In some embodiments, the power change data is a corresponding change in received power and/or path loss in at least one path of the low-orbit satellite communication at different points in time.
In some embodiments, the received power and/or path loss is an absolute or relative value at different points in time.
In some embodiments, the time points are in units of communication frames or super communication frames, and/or the time points are associated with absolute time.
In some embodiments, the power change data is downlink-specific, uplink-specific, or both downlink and uplink-specific.
In some embodiments, the data creation module further comprises:
and the average value calculation module is used for measuring the received power and/or the path loss at the same time point in a plurality of periods and carrying out average or weighted average, and taking the average value as power change data at the time point.
In some embodiments, the apparatus further comprises:
and the data synchronization module is used for keeping the synchronization of the power change data in a plurality of devices participating in the low-orbit satellite communication.
In some embodiments, after data synchronization is completed, the control of the transmission and/or reception of the signal is performed by either party device, or the control is performed by each party device on its own in accordance with the synchronization data.
In some embodiments, the control module includes:
a prediction module, configured to predict a received power and/or a path loss at any time according to the power change data;
and the occasion determining module is used for calculating and determining the sending and/or receiving occasions of the signals according to the predicted receiving power and/or path loss.
In some embodiments, the power variation data also includes a plurality of received power and/or path loss information corresponding to different frequencies and/or beams.
In some embodiments, the control module further comprises:
and the strategy determining module is used for selecting a specific frequency and/or beam according to the power change data to formulate a sending and/or receiving strategy of the signal.
Referring to fig. 7, a schematic diagram of an electronic device according to an embodiment of the present application is provided. As shown in fig. 7, the electronic device 700 includes:
memory 730, and one or more processors 710;
wherein the memory 730 is communicatively coupled to the one or more processors 710, and instructions 732 executable by the one or more processors are stored in the memory 730, the instructions 732 being executable by the one or more processors 710 to cause the one or more processors 710 to perform the methods of the foregoing embodiments of the present application.
In particular, processor 710 and memory 730 may be connected by a bus or otherwise, as exemplified in FIG. 7 by bus 740. The processor 710 may be a central processing unit (Central Processing Unit, CPU). The processor 710 may also be a chip such as other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination thereof.
Memory 730 acts as a non-transitory computer readable storage medium that may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as a cascading progressive network in embodiments of the present application, and the like. The processor 710 performs various functional applications and data processing of the processor by running non-transitory software programs, instructions 732, and functional modules stored in the memory 730.
Memory 730 may include a program storage area that may store an operating system, at least one application program required for functionality, and a data storage area; the storage data area may store data created by the processor 710, etc. In addition, memory 730 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 730 may optionally include memory located remotely from processor 710, which may be connected to processor 710 via a network, such as through communication interface 720. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, satellite communication networks, and combinations thereof.
An embodiment of the present application further provides a computer-readable storage medium having stored therein computer-executable instructions that, when executed, perform the method of the previous embodiments of the present application.
The foregoing computer-readable storage media includes both physical volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data. Computer-readable storage media includes, but is not limited to, U disk, removable hard disk, read-Only Memory (ROM), random access Memory (RAM, random Access Memory), erasable programmable Read-Only Memory (EPROM), electrically erasable programmable Read-Only Memory (EEPROM), flash Memory or other solid state Memory technology, CD-ROM, digital Versatile Disks (DVD), HD-DVD, blue-Ray or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium capable of storing the desired information and that can be accessed by a computer.
While the subject matter described herein is provided in the general context of operating systems and application programs that execute in conjunction with the execution of a computer system, those skilled in the art will recognize that other implementations may also be performed in combination with other types of program modules. Generally, program modules include routines, programs, components, data structures, and other types of structures that perform particular tasks or implement particular abstract data types. Those of ordinary skill in the art will appreciate that the elements and method steps of the examples described in connection with the embodiments of the application herein may be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or a part of the technical solution, or in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.
In summary, the embodiment of the invention provides a low-orbit satellite communication method, a device, an electronic device and a storage medium. The embodiment of the invention correlates the sending and receiving control of the signal with the power change condition through calculating and predicting the power change condition, thereby effectively ensuring the success rate of signal receiving and transmitting and improving the communication quality.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (17)
1. A method for low-orbit satellite communication, applied to at least one party device participating in the low-orbit satellite communication, comprising:
establishing power change data locally;
and controlling the signal transmission according to the power variation data, comprising:
predicting the received power or path loss at any moment according to the power change data;
the transmission opportunity of the signal is calculated based on the predicted received power or path loss.
2. The method of claim 1, wherein the power change data is a corresponding change in received power or path loss at different points in time in at least one path of the low-orbit satellite communication.
3. The method of claim 2, wherein the received power or path loss is an absolute value or a relative value at different points in time.
4. The method of claim 2, wherein the point in time is in units of a communication frame or a super communication frame, the point in time being associated with an absolute time.
5. The method according to claim 2, wherein the method further comprises:
the received power or path loss at the same time point is measured in a plurality of periods and averaged or weighted averaged, and the average value is taken as power change data at the time point.
6. The method of claim 1, wherein the power change data is for downlink, or for uplink, or both downlink and uplink are recorded.
7. The method according to claim 1, wherein the method further comprises:
synchronization of the power change data is maintained in a plurality of devices engaged in the low-orbit satellite communication.
8. The method of claim 7, wherein the method further comprises:
after the data synchronization is completed, any one of the devices controls the transmission of the signal, or each of the devices controls itself according to the synchronization data.
9. The method of claim 1, wherein the power variation data further comprises a plurality of received power or path loss information corresponding to different frequencies or beams.
10. The method according to claim 9, wherein the method further comprises:
and selecting specific frequencies and beams according to the power variation data to formulate a transmission strategy of the signals.
11. A low-orbit satellite communication apparatus, the apparatus being at least one device engaged in the low-orbit satellite communication, comprising:
the data establishing module is used for locally establishing power change data;
the control module is used for controlling the signal transmission according to the power change data, and comprises the following components:
a prediction module, configured to predict a received power or a path loss at any time according to the power change data;
and the occasion determining module is used for calculating the sending occasion of the signal according to the predicted receiving power or path loss.
12. The apparatus of claim 11, wherein the power change data is a corresponding change in received power or path loss at different points in time in at least one path of the low-orbit satellite communication.
13. The apparatus of claim 12, wherein the data establishment module further comprises:
and the average value calculation module is used for measuring the received power or the path loss at the same time point in a plurality of periods and carrying out average or weighted average, and taking the average value as the power change data at the time point.
14. The apparatus of claim 11, wherein the apparatus further comprises:
and the data synchronization module is used for keeping the synchronization of the power change data in a plurality of devices participating in the low-orbit satellite communication.
15. The apparatus of claim 11, wherein the control module further comprises:
and the strategy determining module is used for selecting specific frequencies and beams according to the power change data to formulate a transmission strategy of the signal.
16. An electronic device, comprising:
a memory and one or more processors;
wherein the memory is communicatively connected to the one or more processors, the memory having stored therein a computer program executable by the one or more processors, the computer program, when executed by the one or more processors, being operable to implement the method of any of claims 1-10.
17. A computer readable storage medium having stored thereon a computer program executable by a processor to implement the method of any of claims 1-10.
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