CN113965243A - 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-earth-orbit satellite communication method, a low-earth-orbit satellite communication device, electronic equipment and a storage medium, which are applied to at least one piece of equipment participating in low-earth-orbit satellite communication. Wherein, the method comprises the following steps: locally establishing power variation data; controlling the transmission and/or reception of signals in accordance with the power variation data. The technical scheme of the embodiment of the invention associates the sending and receiving control of the signal with the power change condition by calculating and predicting the power change condition, thereby effectively ensuring the success rate of signal receiving and sending and improving the communication quality.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a low-earth-orbit satellite communication method, a low-earth-orbit satellite communication device, electronic equipment and a computer-readable storage medium.
Background
The rapid development of digital mobile communications has brought a completely new impetus for the production and life of the human society, where terrestrial cellular network technology is the current major access type for mobile communications and has evolved along the speed of one generation per decade. For example, in about 2020, the 5 th generation (5G) mobile network rate first starts deployment work in some developed countries and regions, bringing communication speed up to 10GBps to users.
However, in some less developed countries and regions, access and upgrade of mobile communication services still cannot be achieved in the short term. This is mainly due to the fact that the infrastructure level of local communication networks is relatively backward, for example, in the vast african regions, hundreds of millions of people still have no access to 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 heavy ground infrastructure. But the stratospheric aircraft attempts have failed to be put into practical operation for a variety of reasons; compared with the way of directly providing wireless communication to the ground by using a satellite system, the method is mature.
Based on the type of satellite orbit, the method is further divided into two modes of using geostationary satellites (GEO) and using low-medium orbit (LEO) satellites. A geostationary satellite can provide a wireless access service while keeping a geostationary position at a height of approximately 3600 km above an equator orbit, but the orbit is limited, the system capacity of a communication system is limited, and a service area cannot cover a high-dimensional area.
While the medium and low orbit satellites can not keep relatively still with the earth, the global coverage can be theoretically realized by means of constellations. And since the capacity of a 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 building a globally-covered, high-capacity communication system using the LEO constellation can quickly provide wireless access capability to such less-developed regions. However, establishing a wireless link between a high-speed moving satellite and a ground terminal also faces many technical challenges, and one of the typical problems is the negative influence of the low-orbit satellite moving at a high speed relative to the ground on the signal transceiving and communication rate.
Specifically, since the satellite communication frequency is in the KA or KU band, the path loss of the band is large, and the ground end cannot obtain effective received power without using a phased array antenna to perform beamforming on radio waves. On one hand, when multiple users access, the satellite cannot flexibly adjust the beam direction or the transmitting power according to the requirements of each user; on the other hand, in the satellite motion process, the receiving power at the ground end has a large fluctuation, and the changed receiving power means an increase in the packet error rate, even a loss of a link, which seriously affects the user experience.
Disclosure of Invention
In view of the above technical problems in the prior art, embodiments of the present invention provide a method and an apparatus for low-earth-orbit satellite communication, an electronic device, and a storage medium, so as to solve the problem that the reception quality of the ground end is affected by high-speed movement of a satellite.
A first aspect of an embodiment of the present invention provides a low earth orbit satellite communication method, applied to at least one device participating in low earth orbit satellite communication, including: locally establishing power variation data; controlling the transmission and/or reception of signals in accordance with the power variation data.
In some embodiments, the power variation data is a corresponding variation of received power and/or path loss in at least one path of the low earth orbit satellite communications at different points in time.
In some embodiments, the received power and/or path loss is an absolute value or a relative value at different points in time.
In some embodiments, the point in time is in units of a communication frame or a hyper communication frame, and/or the point in time is associated with an absolute time.
In some embodiments, the method further comprises:
and measuring the received power and/or the path loss of the same time point in a plurality of periods and carrying out averaging or weighted averaging, and taking the average value as the power change data of the time point.
In some embodiments, the power change data is downlink directed or uplink directed or both downlink and uplink recorded.
In some embodiments, the method further comprises:
maintaining synchronization of the power change data among a plurality of devices participating in the low-earth-orbit satellite communications.
In some embodiments, the method further comprises:
after the data synchronization is completed, either one of the devices controls the transmission and/or reception of the signal, or the devices control themselves according to the synchronization data.
In some embodiments, said controlling the transmission and/or reception of signals according to said power variation data comprises:
predicting the received power and/or path loss at any time according to the power change data;
the transmission and/or reception timing of the signal is calculated and determined from the predicted received power and/or path loss.
In some embodiments, the power variation data further 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:
selecting a particular frequency and/or beam to tailor a transmission and/or reception strategy of the signal based on the power variation data.
A second aspect of an embodiment of the present invention provides an apparatus for low-earth-orbit satellite communication, where the apparatus is at least one device participating in low-earth-orbit satellite communication, and the apparatus includes:
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 the signal according to the power change data.
In some embodiments, the power variation data is a corresponding variation of received power and/or path loss in at least one path of the low earth orbit satellite communications at different points in time.
In some embodiments, the received power and/or path loss is an absolute value or a relative value at different points in time.
In some embodiments, the point in time is in units of a communication frame or a hyper communication frame, and/or the point in time is associated with an absolute time.
In some embodiments, the power change data is downlink directed or uplink directed or both downlink and uplink recorded.
In some embodiments, the data establishment module further comprises:
and the mean value calculating module is used for measuring the received power and/or the path loss of the same time point in a plurality of periods and carrying out averaging or weighted averaging to take the average value as the power change data of the time point.
In some embodiments, the apparatus further comprises:
a data synchronization module to maintain synchronization of the power change data among a plurality of devices participating in the low earth orbit satellite communications.
In some embodiments, the control of the transmission and/or reception of the signals is performed by either party's device after the data synchronization is completed, or is performed by the parties' devices themselves as synchronized data.
In some embodiments, the control module comprises:
a prediction module for predicting received power and/or path loss at any time based on the power variation data;
and the timing determining module is used for calculating and determining the transmitting and/or receiving timing of the signal according to the predicted receiving power and/or the path loss.
In some embodiments, the power variation data further 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 make 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 the memory stores instructions executable by the one or more processors, and when the instructions are executed by the one or more processors, the electronic device is configured to implement the method according to the foregoing embodiments.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium having stored thereon computer-executable instructions, which, when executed by a computing apparatus, may be used to implement the method according to the foregoing 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 implement a method as in the preceding embodiments.
The embodiment of the invention associates the sending and receiving control of the signal with the power change condition by calculating and predicting the power change condition, thereby effectively ensuring the success rate of signal receiving and sending 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 not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic diagram of an exemplary low-earth orbit satellite constellation according to some embodiments of the invention;
FIG. 2 is a diagram illustrating an exemplary scenario for two-way low-earth orbit satellite-based communications, according to some embodiments of the invention;
FIG. 3 is a schematic diagram illustrating an exemplary communication process during movement of a low earth orbit satellite relative to a ground terminal according to some embodiments of the invention;
FIG. 4 is a flow diagram illustrating a method of low earth orbit satellite communication according to some embodiments of the invention;
FIGS. 5A-5E are schematic diagrams illustrating representations of power variation data according to some embodiments of the present invention;
FIG. 6 is a block diagram of a low earth 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 of the invention are set forth by way of examples in order to provide a thorough understanding of the relevant disclosure. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. It should be understood that the use of "system," "device," "unit" and/or "module" terminology herein is a method for distinguishing between different components, elements, portions or assemblies at different levels of sequential arrangement. However, these terms may be replaced by other expressions if they 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 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 dictates otherwise. For example, as used herein, the term "and/or" 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 limit the scope of the present invention. As used in the specification and claims of this application, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified features, integers, steps, operations, elements, and/or components, but not to constitute an exclusive list of such features, integers, steps, operations, elements, and/or components.
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 and the combination of parts and economies of manufacture, will be better understood upon consideration of the following description and the accompanying drawings, 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 present invention to illustrate various variations of embodiments according to the present invention. It should be understood that the foregoing and following configurations are not intended to limit the present invention. The protection scope of the invention is subject to the claims.
The low earth orbit satellite realizes global coverage by a constellation forming mode, thereby providing wireless communication capability for the ground terminal of the whole world. As shown in fig. 1, a typical constellation of low earth orbit satellites consists of a plurality of orbits, each orbit having a plurality of low earth orbit satellites that provide wireless access to a region of the earth via a communication link. Because of the orbit altitude problem, each satellite in the constellation keeps moving at a high speed relative to the ground, and therefore the area covered by its communication link changes at any time. Fig. 2 is a schematic diagram of a typical satellite providing a radio access service to the ground, in which the carrier frequency of the communication link between the low-earth satellite and the gateway station and the ground terminal may be a radio signal in KA, KU, V band, and to solve the problem of large path loss, the low-earth satellite transmits and receives the radio signal to the ground through beam forming implemented by a phased array antenna array. In fig. 2, the ground terminal and the low earth orbit satellite communicate bi-directionally via a service link and the low earth orbit satellite and the ground gateway station communicate bi-directionally via a feeder link. Among other things, in current product implementations, ground terminals are typically semi-static devices equipped with parabolic antennas that are relatively fixed in position for the majority of the time of use. In a specific operation, as shown in fig. 3, the satellite moves along a fixed route relative to the ground terminal, and since the low-earth satellite is a low-cost communication satellite with only fixed beam capability, the beam direction of the low-earth satellite cannot be flexibly adjusted during the movement, from the perspective of a ground receiving end, a signal transmitted by one low-earth satellite experiences a process from low to high power, and then from high to low. Such power variations are very disadvantageous for the communication system, because the received power determines the success rate of packet demodulation, and the varying received power means an increase in the packet error rate, even a loss of link, and poor system stability. From a user experience point of view, the unstable, good-time-bad communication quality of the link is very bad for the instant-class application.
In view of this, in the embodiment of the present invention, the transmission and reception control of the signal is associated with the power change condition by calculating and predicting the power change condition, so that the success rate of signal transmission and reception is effectively ensured, and the communication quality is improved.
In which, according to the research on the operation law of the low-earth orbit satellite, it can be found that, compared with the ground communication system, the channel conditions of the satellite and the ground terminal generally have a direct path (LOS) whose amplitude is distributed according to rice distribution (RiceDistribution). 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 between the low-earth satellite and the ground terminal. In addition, the beamforming has different gains in different directions, and the gains are related to the beam center direction and the angle between the satellite and the ground terminal. Since several key conditions affecting the received power can be quantitatively measured, the change of the low earth orbit satellite received power becomes more regular, that is, more predictable, compared with the random change of the ground cellular network power, so that the technical scheme of the embodiment of the invention has theoretical feasibility.
In particular operation, as shown in fig. 3, the satellite moves in a fixed path relative to the ground terminal, and although the satellite orbit is circular, it moves approximately parallel to the ground for a short period of time. The chain path loss, i.e., the ratio of received power to transmitted power, Pr/Pt, between the satellite and the terrestrial terminal at three typical times T1, T2, and T3 depends on the distance between the low-earth satellite and the terminal and the beamforming gain of the beamforming in the straight direction. Overall, during the satellite sweeping the ground terminal, the ground terminal received power will go through the process from low to high and then from high to low. Compared with the complex channel environment of a base station and a ground terminal of ground communication, although the channel between a low-earth satellite and the ground terminal is constantly changed, the change is stable, mainly because a direct path with stronger power exists in the channel between the satellite and the terminal, and the motion trajectories of a plurality of satellites on the same orbit of a constellation are 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 the link and the power efficiency of the equipment.
As shown in fig. 4, a low-earth-orbit satellite communication method in an embodiment of the present invention includes:
s401, power change data is established locally.
Wherein, in the 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-earth satellite communication process is participated in by at least a satellite side and a ground side together, wherein the satellite side comprises at least one low-earth satellite, and the ground side comprises at least one ground terminal; terrestrial terminals are usually semi-static devices equipped with parabolic antennas, but with the miniaturization of the devices, terrestrial terminals may in the future also comprise mobile handsets, and possibly even all mobile terminals (i.e. not comprising static/semi-static fixed terminals).
In one embodiment of the invention, the power variation data represents the corresponding variation of the received power or path loss in the low earth orbit satellite communication path at different points in time. Optionally, the locally established power change data includes a power change relationship in at least one communication path of the current device; further, the power variation relationship among all possible paths of the current device or among all paths of all devices can be included. Taking the ground terminal as an example, the power variation data established by the ground terminal at least includes the power variation relationship of the communication path with a low-earth satellite, such as the ground terminal in fig. 3, and at least establishes the variation curve/function of the received power or path loss in the communication path between the ground terminal and the low-earth satellite in the figure at the time T1-T3.
S402, controlling the sending and/or receiving of the signal according to the power change data.
In conventional communication methods, the transmission (and reception) of signals is generally controlled by pilot signals (such as random access pilots), which are generally generated according to the 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 influence 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 sending time is seriously shortened, and the influence on the communication quality is great. In an embodiment of the invention, the transmission and/or reception of signals is controlled in accordance with 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 sending opportunity and/or power of the access according to the predicted receiving power or path loss, thereby effectively improving the communication quality.
In one embodiment of the invention, the power variation data is an absolute value or a relative value of the power or the path loss at different points in time. Preferably, the different points in time are in units of communication frames or super communication frames. FIG. 5A is a diagram of a plurality of super frames (hereinafter referred to as super frames) and normal frames (hereinafter referred to as normal frames or frames), wherein a super frame may include a plurality of normal frames; each super frame or each common frame has an association number, and the specific association number is cyclically used in a preset range. Fig. 5B and 5C further show diagrams of power change data corresponding to super frames and normal frames, where the super frames and the normal frames are respectively numbered continuously, and each super frame and each normal frame in the power change data correspond to a specific path loss value, so as to represent a possible power situation in a communication path at a time point corresponding to the super frame or the normal frame (i.e., represent a prediction of the power situation at the time point). Of course, those skilled in the art will appreciate that the signal received power value may be expressed in addition to the path loss value. Through different length settings of the frames or the super frames, the power change data can reflect path fading changes of communication links of the satellite and the ground terminal on large scale or small scale.
In the embodiments of fig. 5B and 5C, absolute value information such as an absolute path loss value or an absolute received power value is given; in an embodiment of the present invention, the power change data may also be represented by a relative change value, such as a path loss difference or a power difference between one or more adjacent normal frames/super frames. Taking the ground terminal and the satellite link of fig. 3 as an example, when the satellite moves on the orbit and sweeps over the ground terminal, the ground terminal shows a change from low to high and then from high to low in the received power, so the power change data can be a path loss difference or a power difference in two stages; wherein, from the stage T1 to the stage T2, the difference is a positive value; from stage T2 to stage T3, the difference is negative. Further, the power difference value can be divided into more stages in the period scanned by one satellite, and only one difference value data exists in each stage; fig. 5D, for example, further takes two frames as a stage, each stage being associated with a difference, e.g., frame #2 power-frame #1 power 3dB, frame #3 power-frame #2 power 3 dB; frame M power-frame M-1 power-2 dB.
In one embodiment of the invention, the power change data is obtained by the satellite and sent to the ground terminal, and the ground terminal receives and stores the relevant information; preferably, the satellite may obtain the power variation data by listening to received power or path loss data reported by the ground terminal.
In another embodiment of the present invention, the power change data is measured by the ground terminal and stored locally directly. 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 the different time points. The time points here may be the numbering of the frames or superframes shown in fig. 5A, with different time points corresponding to different numbering. Preferably, frames or superframes within one period of satellite operation are numbered consecutively, the numbering being recycled from the beginning in the next period; therefore, frames or superframes with the same number in each period can be considered as the same time point; the frames or super frames with different numbers are considered as different time points whether in the same period or belonging to different periods. Alternatively, the ground terminal may measure the received power or the path loss of the same time point (for example, frames or super frames with the same number) in multiple cycles and perform averaging or weighted averaging, and the average value is used as the power variation data of the time point.
In this way, the ground terminal finally obtains power change data associated with the time point. The received power or the path loss in the embodiment of the present invention may be for the downlink, and may also be for the uplink, or may record the power variation data of the downlink and the uplink at the same time. For example, the received power of each frame/super frame in fig. 5B and 5C may be the received power of the terrestrial terminal for receiving the satellite signal, or the received power of the signal reaching the satellite when the terrestrial terminal transmits the signal at a certain transmission power, and the received power on the satellite side (i.e., uplink) may be measured and recorded by the satellite.
After obtaining the power variation data, the transmission and/or reception control of the signal can further be performed using the locally stored power variation data. In the embodiment of the present invention, the power variation data may be established in at least one device participating in communication, so that the at least one device participating in communication may also perform transmission and/or reception control of signals. In a preferred embodiment of the invention, the synchronization of the power variation data can be maintained in a plurality of devices on the ground terminal and satellite sides, i.e. each of the plurality of devices has a copy of the same power variation data; accordingly, after the data synchronization is completed, the transmission and/or reception control of the signal may be performed by any one of the devices, or may be performed by each of the devices according to the synchronization data.
After obtaining the power variation data, the terminal canTo estimate the received power or path loss at any one time from the information at the other time. For example, a low earth satellite in 550km orbit may be 600km from the ground terminal at time T1, and the two-way delay of the signal may be up to 4 ms. If the time length of one frame is 1ms, the satellite obtains the data packet of the ground terminal at least after 5ms after sending a command through one frame. Other procedures that require multiple information exchanges to complete imply longer delays. In one case, the ground terminal needs to transmit an uplink signal at a target received power, e.g., transmit a random access pilot, to access a satellite that has just been identified. The ground terminal identifies the satellite through a downlink signal of the satellite, and obtains the received power or the path loss through a reference signal (obtained by calculating the received power after the signaling sent by the satellite indicates the sending power). At this time, the ground terminal may calculate the timing 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 based on the currently measured reception power or path loss, but calculates based on the predicted reception power or path loss. The specific calculation process is PrFor the current downlink received power, PTarFor the target received power of the uplink signal, PL is the currently measured path loss. The time point of transmitting the uplink signal satisfies:
PT+PLe≥PTar；
wherein, PTThe transmit power may be calculated according to the maximum achievable transmit power of the transmitting terminal in general; PLeThe predicted path loss can be derived from PL and power variation data.
For example, one terrestrial terminal measures PL as-100 dB, PTIs 30dB and PTarIs 5 dB; it should be noted that the power here includes the gain due to the satellite-side and ground-terminal beam forming. In the conventional manner, the random access pilot is transmitted when the terminal continues to measure PL up to-25 dB, which is equivalent to PLe-25 dB. By adopting the technical scheme of the embodiment of the invention, the ground terminal changes the number according to the powerAccording to the sum of PL-100 dB and PLeThe optimal transmit frame (i.e., time point) is estimated at-25 dB, e.g., based on the accumulated power difference, frame X is calculated to satisfy PLeThe terminal may send a random access pilot directly at frame X or re-measure the PL at frame X for the-25 dB first frame.
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 embodiments of the present invention may be obviously applied 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 taken as a specific limitation to the implementation of signal control in the technical solution of the present invention.
The above embodiments have explained the manner of estimating the transmission timing of the uplink signal by using the measured downlink power reuse power variation data. In another embodiment of the present invention, the ground terminal may select the optimal uplink transmission time only according to the power variation data, for example, a simplest implementation manner is: according to the power and superframe correspondence as shown in fig. 5, the terminal initiates an access request only in a subset of the superframe; the path loss of each frame in the selected subset is small or the received power is large, and the access success probability is high at this moment. The method of the preferred embodiment is more beneficial to the low-power-consumption ground terminal of the internet of things, because the ground terminal selects the optimal time according to the power change data, namely the time when the satellite is closest to the ground and/or the time when the beam gain is maximum is accessed to the satellite, the ground terminal adopting the method can selectively use non-full power to send the uplink signal, and thus the power consumption of the ground terminal can be effectively reduced.
As further shown in fig. 5E, according to the power variation data locally stored by the ground terminal, especially according to the received power or path loss information therein, the ground terminal may determine that the satellite side may not successfully receive the data packet even though the signal is transmitted at full power in the first time period (superframe #1, superframe #2, superframe # 3); meanwhile, the ground terminal judges whether the data packet is successfully received by the satellite side if the data packet is transmitted by using full power in a second time period (superframe # M and superframe M + 1); further, the ground terminal determines that the path loss is minimum in the third time period (superframe # N, superframe # N +1), and may transmit a signal with a smaller power. Therefore, the ground terminal side can select the optimum transmission timing according to the power variation data. Of course, it should be understood by those skilled in the art that the above embodiment is exemplified by the ground terminal side, but the control method is also applicable to the satellite side, that is, the satellite side can also control the signal transmission with non-full power according to the power variation data, so as to reduce the power consumption of the device.
In a preferred embodiment of the present invention, the low earth satellite-to-ground communication link comprises a plurality of channels or beams distributed at different frequencies. The power variation data may contain a plurality of received power or path loss information corresponding to different frequencies or beams at this time. According to the power change data, the ground terminal or the satellite side can select the sending time and can also select a specific frequency and a specific beam to make a sending strategy.
In one embodiment of the invention, the time points (frames/superframes) 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 sweeping a certain ground terminal is relatively fixed in different periods, and accurate prediction can be performed in advance according to an operation rule or a plan. Therefore, in the preferred embodiment of the present invention, the number of the frame/super frame 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 uniform and accurate transmission strategy can be established by means of the absolute time.
In one embodiment of the present invention, the ground terminal may also formulate a signal reception strategy based on the power variation data. For example, the ground terminal may derive an optimal satellite identification timing based on path loss information associated with the frame or superframe, such as by scanning a downlink signal to identify the presence of a satellite. In addition, the satellite side can also make a signal transmission or reception strategy according to the power change data. For example, the satellite may select to transmit the scheduling signaling of the uplink signal of the terrestrial terminal at the time of the frame with the smallest path loss or the strongest received power on the satellite side (considering the bidirectional 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 a signal at the highest modulation and coding order, thereby maximizing the communication rate.
The above is a specific embodiment of the low-earth-orbit satellite communication method provided by the invention.
Fig. 6 is a schematic diagram of a low earth orbit satellite communication device according to some embodiments of the present disclosure. In an embodiment of the invention, the low-earth satellite communication process is commonly participated by a plurality of communication devices, in particular, the low-earth satellite communication process is commonly participated by at least a satellite side and a ground side, the satellite side comprises at least one low-earth satellite, and the ground side comprises at least one ground terminal. As shown in fig. 6, the low-earth satellite communication apparatus 600 is at least one device participating in the low-earth 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 a signal according to the power variation data.
In some embodiments, the power variation data is a corresponding variation of received power and/or path loss in at least one path of the low earth orbit satellite communications at different points in time.
In some embodiments, the received power and/or path loss is an absolute value or a relative value at different points in time.
In some embodiments, the point in time is in units of a communication frame or a hyper communication frame, and/or the point in time is associated with an absolute time.
In some embodiments, the power change data is downlink directed or uplink directed or both downlink and uplink recorded.
In some embodiments, the data establishment module further comprises:
and the mean value calculating module is used for measuring the received power and/or the path loss of the same time point in a plurality of periods and carrying out averaging or weighted averaging to take the average value as the power change data of the time point.
In some embodiments, the apparatus further comprises:
a data synchronization module to maintain synchronization of the power change data among a plurality of devices participating in the low earth orbit satellite communications.
In some embodiments, the control of the transmission and/or reception of the signals is performed by either party's device after the data synchronization is completed, or is performed by the parties' devices themselves as synchronized data.
In some embodiments, the control module comprises:
a prediction module for predicting received power and/or path loss at any time based on the power variation data;
and the timing determining module is used for calculating and determining the transmitting and/or receiving timing of the signal according to the predicted receiving power and/or the path loss.
In some embodiments, the power variation data further 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 make 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 that are executable by the one or more processors are stored in the memory 730, and the instructions 732 are executable by the one or more processors 710 to cause the one or more processors 710 to perform the methods of the embodiments of the present application.
In particular, processor 710 and memory 730 may be connected by a bus or other means, such as bus 740 in FIG. 7. Processor 710 may be a Central Processing Unit (CPU). The Processor 710 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or any combination thereof.
The memory 730, as a non-transitory computer readable storage medium, may be used for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as the cascaded progressive network in the embodiments of the present application. The processor 710 performs various functional applications of the processor and data processing by executing non-transitory software programs, instructions 732, and functional modules stored in the memory 730.
The memory 730 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 710, and the like. Further, the 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 optionally includes memory located remotely from processor 710, and such remote memory may be connected to processor 710 via a network, such as through communications 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, in which computer-executable instructions are stored, and the computer-executable instructions are executed to perform the method in the foregoing embodiment of the present application.
The foregoing computer-readable storage media include physical volatile and nonvolatile, removable and non-removable media implemented in any manner or technology for storage of information such as computer-readable instructions, data structures, program modules or other data. The computer-readable storage medium specifically includes, but is not limited to, a USB flash drive, a removable hard drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), an erasable programmable Read-Only Memory (EPROM), an electrically erasable programmable Read-Only Memory (EEPROM), flash Memory or other solid state Memory technology, a CD-ROM, a Digital Versatile Disk (DVD), an HD-DVD, a Blue-Ray or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer.
While the subject matter described herein is provided in the general context of execution in conjunction with the execution of an operating system and application programs on 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 various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations 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 implementation. 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 or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method according to the embodiments of the present application.
In summary, embodiments of the present invention provide a low-earth-orbit satellite communication method, apparatus, electronic device and storage medium. The embodiment of the invention associates the sending and receiving control of the signal with the power change condition by calculating and predicting the power change condition, thereby effectively ensuring the success rate of signal receiving and sending and improving the communication quality.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (19)
1. A method for low earth orbit satellite communication, applied to at least one device participating in the low earth orbit satellite communication, comprising:
locally establishing power variation data;
controlling the transmission and/or reception of signals in accordance with the power variation data.
2. The method according to claim 1, wherein the power variation data is a corresponding variation of received power and/or path loss in at least one path of the low earth orbit satellite communication at different time points.
3. The method according to claim 2, wherein the received power and/or the path loss are absolute or relative values at different points in time.
4. The method according to claim 2, wherein the time point is in units of communication frames or super communication frames, and/or wherein the time point is associated with an absolute time.
5. The method of claim 2, further comprising:
and measuring the received power and/or the path loss of the same time point in a plurality of periods and carrying out averaging or weighted averaging, and taking the average value as the power change data of the time point.
6. The method of claim 1, wherein the power variation data is for downlink, or for uplink, or for both downlink and uplink.
7. The method of claim 1, further comprising:
maintaining synchronization of the power change data among a plurality of devices participating in the low-earth-orbit satellite communications.
8. The method of claim 7, further comprising:
after the data synchronization is completed, either one of the devices controls the transmission and/or reception of the signal, or the devices control themselves according to the synchronization data.
9. The method according to claim 1, wherein said controlling transmission and/or reception of signals according to said power variation data comprises:
predicting the received power and/or path loss at any time according to the power change data;
the transmission and/or reception timing of the signal is calculated and determined from the predicted received power and/or path loss.
10. The method of claim 9, wherein the power variation data further comprises a plurality of received power and/or path loss information corresponding to different frequencies and/or beams.
11. The method of claim 10, further comprising:
selecting a particular frequency and/or beam to tailor a transmission and/or reception strategy of the signal based on the power variation data.
12. An apparatus for low-earth-orbit satellite communication, wherein the apparatus is at least one device participating in the low-earth-orbit satellite communication, comprising:
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 the signal according to the power change data.
13. The apparatus of claim 12, wherein the power variation data is a corresponding variation of received power and/or path loss in at least one path of the low earth orbit satellite communication at different time points.
14. The apparatus of claim 13, wherein the data establishment module further comprises:
and the mean value calculating module is used for measuring the received power and/or the path loss of the same time point in a plurality of periods and carrying out averaging or weighted averaging to take the average value as the power change data of the time point.
15. The apparatus of claim 12, further comprising:
a data synchronization module to maintain synchronization of the power change data among a plurality of devices participating in the low earth orbit satellite communications.
16. The apparatus of claim 12, wherein the control module comprises:
a prediction module for predicting received power and/or path loss at any time based on the power variation data;
and the timing determining module is used for calculating and determining the transmitting and/or receiving timing of the signal according to the predicted receiving power and/or the path loss.
17. The apparatus of claim 16, wherein 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 make a sending and/or receiving strategy of the signal.
18. An electronic device, comprising:
a memory and one or more processors;
wherein the memory is communicatively coupled to the one or more processors and has stored therein instructions executable by the one or more processors, the electronic device being configured to implement the method of any of claims 1-11 when the instructions are executed by the one or more processors.
19. A computer-readable storage medium having stored thereon computer-executable instructions operable, when executed by a computing device, to implement the method of any of claims 1-11.
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| WO2025020180A1 (en) * | 2023-07-27 | 2025-01-30 | Nokia Shanghai Bell Co., Ltd. | Power control |
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