Satellite communication system power control method based on 5G technology

Abstract

The invention discloses a satellite communication system power control method based on a 5G technology, the method is applied to a satellite in a satellite communication system, and the method comprises the following steps: the satellite determines a current service wave position according to a wave position scheduling condition; the satellite determines the distance between the satellite and the current service wave position according to the ephemeris information; the satellite calculates and obtains signal transmitting power according to a Fries formula, the distance and preset signal receiving power; and the satellite sends a service beam to the current service beam position according to the signal transmitting power. According to the method provided by the invention, the satellite can be matched with proper signal transmitting power according to the distance, relatively strong signal transmitting power is adopted for a far-point terminal, and relatively weak signal transmitting power is adopted for a near-point terminal; and similarly, the terminal can also be matched with proper signal transmitting power according to the distance from the satellite, so that the reliability of the satellite communication system can be ensured no matter on the satellite side or on the terminal side, and meanwhile, the effect of saving electricity can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a power control method for a satellite communication system based on 5G technology. Background Art

[0002] Compared with terrestrial mobile communication networks, satellite communications can achieve wide-area or even global coverage, providing non-differentiated communication services to users around the world. At the same time, the terrestrial fifth-generation mobile communication (5G) system already has a complete industrial chain, a huge user base, and a flexible and efficient application service model. Satellite communications and 5G are integrated with each other, complementing each other's strengths and weaknesses, and together form a global seamless coverage of the sea, land, air, and space integrated integrated communication network, which meets the ubiquitous and diverse business needs of users and is an important direction for the future development of communications.

[0003] In satellite communication systems, the distance between the satellite and the (ground) terminal is very far, so the signal transmission distance is much greater than that of ground communication and mobile communication. In satellite communication systems, the distance between the near-point terminal and the far-point terminal and the satellite is very different, such as Figure 1 As shown in Figure 1, it can be seen that the distance between the terminal and the satellite at different locations on the ground is very different. Figure 2 As shown, it shows a schematic diagram of the signal transmission distance between the satellite and terminals at different locations. It can be seen that no matter in the downlink direction or the uplink direction, the signal transmission distance between the near-point terminal and the satellite is smaller, while the signal transmission distance between the far-point terminal and the satellite is relatively larger. This results in a great difference in the requirements for signal transmission power between the near-point terminal and the far-point terminal. In order to achieve reliable transmission, the signal power required by the terminals at different locations on the ground also varies greatly.

[0004] In a terrestrial mobile communication network, the transmission power of a ground base station is generally constant, and the same power is used to send signals to both near-point terminals and far-point terminals to ensure that terminals at all locations can receive reliable signal power.

[0005] However, for satellite communication systems, due to the limitation of satellite payload, the energy consumption cost of satellites is relatively high. If the satellite always uses higher power to transmit signals in order to take care of the far-point terminals, it will cause additional power consumption, thereby increasing the use cost of the satellite communication system. Summary of the invention

[0006] In view of the problem in the prior art that reliability and energy consumption cannot be taken into account when a satellite in a satellite communication system communicates with terminals at different locations, the purpose of the present invention is to provide a power control method for a satellite communication system based on 5G technology, so as to at least partially solve the above problem.

[0007] To achieve the above object, the technical solution of the present invention is: In a first aspect, the present invention provides a power control method for a satellite communication system based on 5G technology, the method being applied to a satellite in a satellite communication system, the method comprising the following steps: The satellite determines the current service beam position according to the beam position scheduling situation; The satellite determines the distance between the satellite and the current service beam position based on the ephemeris information; The satellite calculates the signal transmission power according to the Friis formula, the distance and the preset signal reception power; The satellite sends a service beam to the current service beam position according to the signal transmission power.

[0008] In some preferred embodiments, before the satellite sends a service beam to the current service beam position according to the signal transmission power, the following steps are also included: The satellite determines whether the signal transmission power exceeds a preset maximum value; If yes, the satellite sends a service beam to the current service beam position according to the preset maximum value, otherwise the satellite continues to determine whether the signal transmission power is lower than the preset minimum value; If yes, the satellite sends a service beam to the current service beam position according to the preset minimum value; otherwise, the satellite sends a service beam to the current service beam position according to the signal transmission power.

[0009] In a second aspect, the present invention further provides a satellite communication system power control method based on 5G technology, the method being applied to a terminal in a satellite communication system, the method comprising the following steps: The terminal determines the satellite-to-earth distance between the terminal and the satellite based on the ephemeris information; The terminal satellite calculates the signal transmission power according to the Friis formula, the satellite-to-ground distance and the preset signal reception power; The terminal sends a service signal to the satellite according to the signal transmission power.

[0010] In some preferred embodiments, before the terminal sends a service signal to the satellite according to the signal transmission power, the following steps are also included: The terminal determines whether the signal transmission power exceeds a preset maximum value; If yes, the terminal sends a service signal to the satellite according to the preset maximum value, otherwise the terminal continues to determine whether the signal transmission power is lower than the preset minimum value; If yes, the terminal sends the service signal to the satellite according to the preset minimum value; otherwise, the terminal sends the service signal to the satellite according to the signal transmission power.

[0011] In a third aspect, the present invention further provides an electronic device, comprising a memory storing executable program code and a processor coupled to the memory; wherein the processor calls the executable program code stored in the memory to execute the method as described above.

[0012] In a fourth aspect, the present invention further provides a computer-readable storage medium storing a computer program, wherein the computer program executes the method described above when executed by a processor.

[0013] By adopting the above technical scheme, the beneficial effect of the present invention is that: according to the method provided by the present invention, the satellite can match the appropriate signal transmission power according to the distance, using a stronger signal transmission power for a distant terminal and a weaker signal transmission power for a near terminal; similarly, the terminal can also match the appropriate signal transmission power according to the distance from the satellite, using a stronger signal transmission power for a satellite at a farther position and a weaker signal transmission power for a satellite at a closer position; in this way, both on the satellite side and on the terminal side, it is possible to achieve the effect of power saving while ensuring the reliability of the satellite communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of satellite communication system.

[0015] Figure 2 This is a schematic diagram of the signal transmission distance between satellites and terminals at different locations in a satellite communication system.

[0016] Figure 3 This is a flow chart of a power control method for a satellite communication system based on 5G technology in Embodiment 1 of the present invention.

[0017] Figure 4 Schematic diagram of the satellite's service beams and wave positions in a satellite communication system.

[0018] Figure 5 This is a flow chart of a satellite communication system power control method based on 5G technology in Embodiment 2 of the present invention.

[0019] Figure 6 It is a schematic diagram of the structure of an electronic device in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Embodiment 1 The embodiment of the present invention provides a power control method for a satellite communication system based on 5G technology, and the method is applied to a satellite in a satellite communication system. Figure 3 As shown, the method includes four steps S1-S4.

[0022] S1. The satellite determines the current service beam position according to the beam position scheduling situation.

[0023] In satellite communication systems, since satellites are far away from the ground, the power of satellite antennas cannot cover all areas under the satellite. Therefore, satellites usually use multiple service beams. Each beam is directional and can only cover a relatively narrow ground area. This ground area is called a beam position. Different beam positions have different distances from the satellite. When communicating, satellites can use different service beams to cover different beam positions at the same time, such as Figure 4 As shown, of course, the satellite can also use a single service beam to serve different beam positions at different times in a time-division manner.

[0024] Based on this, the satellite can determine the current service beam position according to the beam position scheduling situation.

[0025] S2. The satellite determines the distance between the satellite and the current service beam position based on the ephemeris information.

[0026] The satellite's ephemeris information records the changes in the satellite's position over time, so the distance between the satellite and the current service beam position can be calculated at the current moment.

[0027] S3. The satellite calculates the signal transmission power according to the Friis formula, the distance and the preset signal reception power.

[0028] In the field of wireless communications, the signal transmission distance formula is often expressed in the form of the following Friis formula, which describes the relationship between the transmission distance of radio electromagnetic waves in free space and the signal power.

[0029]

[0030] Among them, Pr is the signal receiving power, Pt is the signal sending power, Gt and Gr are the gains of the transmitting antenna and the receiving antenna respectively, λ is the wavelength of the signal, and R is the signal transmission distance. It can be seen that when other conditions remain unchanged, the signal receiving power is inversely proportional to the square of the distance.

[0031] Corresponding to this embodiment, the beam assigned by the satellite to the current service wave position is known, that is, the wavelength λ is known. The signal transmission distance R is the distance between the satellite and the current service wave position calculated in step S2. Gt is the gain of the transmitting antenna on the satellite used to send the service beam to the current service wave position, which is also known. Gr is the gain of the receiving antenna, that is, the gain of the receiving antenna on the terminal in the current service wave position (for the terminal, Gr actually includes the antenna gain and the RF link gain, and the two can be balanced, the former can be higher and the latter can be lower, or vice versa). Based on the requirements for signal transmission reliability, for the terminal, in its reliable working state, the value of its signal receiving power Pr is usually certain, which is a preset value and pre-loaded in the satellite. And when the signal receiving power Pr of the terminal is unified, for the terminal, the power parameter setting of each module is internally decomposed and set by the terminal manufacturer itself, so that the Gr on the terminal side is also a preset value.

[0032] Therefore, according to the Freese formula, the signal transmission power of the service beam sent by the satellite to the current service beam position can be calculated, which is Pt in the formula.

[0033] S4. The satellite sends the service beam to the current service beam position according to the signal transmission power.

[0034] It is easy to understand that in actual applications, the satellite will not send the service beam completely according to the signal transmission power calculated above. Therefore, before the satellite sends the service beam to the current service beam position according to the signal transmission power, the method of this embodiment also includes the following steps: The satellite determines whether the signal transmission power exceeds the preset maximum value; If yes, the satellite sends the service beam to the current service beam position according to the preset maximum value, otherwise; The satellite continues to determine whether the signal transmission power is lower than the preset minimum value; If yes, the satellite sends the service beam to the current service beam position according to the preset minimum value, otherwise; The satellite sends a service beam to the current service beam position according to the signal transmission power.

[0035] Of course, it is also possible to first determine whether the signal transmission power is lower than the preset minimum value, and then determine whether the signal transmission power exceeds the preset maximum value. This does not affect the implementation of the technical solution and the realization of the technical effect.

[0036] In this way, according to the method provided by the present invention, the satellite can match the appropriate signal transmission power according to the distance, using a stronger signal transmission power for a distant terminal and a weaker signal transmission power for a near terminal, thereby achieving power saving while ensuring system reliability.

[0037] Embodiment 2 The embodiment of the present invention provides a power control method for a satellite communication system based on 5G technology, and the method is applied to a terminal in a satellite communication system, such as Figure 5 As shown, the method includes three steps S11-S13.

[0038] S11. The terminal determines the distance between the terminal and the satellite based on the ephemeris information.

[0039] The satellite's ephemeris information records the changes in the satellite's position over time. At the same time, the terminal can also determine its own position based on the GNSS signal, so that the terminal can determine the distance between itself and the satellite.

[0040] S12. The terminal satellite calculates the signal transmission power according to the Friis formula, the satellite-to-ground distance and the preset signal reception power.

[0041] In the field of wireless communications, the signal transmission distance formula is often expressed in the form of the following Friis formula, which describes the relationship between the transmission distance of radio electromagnetic waves in free space and the signal power.

[0042]

[0043] Among them, Pr is the signal receiving power, Pt is the signal sending power, Gt and Gr are the gains of the transmitting antenna and the receiving antenna respectively, λ is the wavelength of the signal, and R is the signal transmission distance. It can be seen that when other conditions remain unchanged, the signal receiving power is inversely proportional to the square of the distance.

[0044] Corresponding to this embodiment, the information of the signal sent by the terminal to the satellite is known, that is, the wavelength λ of the signal is known. The signal transmission distance R is the satellite-to-earth distance calculated in step S11. Gt is the gain of the transmitting antenna on the terminal for sending signals to the satellite, which is also known. Gr is the gain of the receiving antenna, that is, the gain of the receiving antenna on the satellite for receiving the signal sent by the terminal. Based on the requirements for signal transmission reliability, usually when the satellite works reliably, the value of the corresponding signal receiving power Pr is also certain, and the terminal can obtain it from the downlink signal sent by the satellite. For the satellite, when the power intensity of the received signal is determined, the power parameter setting of each module of the satellite (such as the satellite's Gr) is internally decomposed and set by the satellite manufacturer itself on this basis.

[0045] Therefore, according to the Freese formula, the signal transmission power of the terminal to the satellite can be calculated, which is Pt in the formula.

[0046] S13. The terminal sends a service signal to the satellite according to the signal transmission power.

[0047] It is easy to understand that in actual applications, the terminal will not send the service signal completely according to the signal transmission power obtained by the above calculation. Therefore, before the terminal sends the service signal to the satellite according to the signal transmission power obtained by the above calculation, the method of this embodiment also includes the following steps: The terminal determines whether the signal transmission power exceeds a preset maximum value; If yes, the terminal sends a service signal to the satellite according to the preset maximum value, otherwise; The terminal continues to determine whether the signal transmission power is lower than the preset minimum value; If yes, the terminal sends a service signal to the satellite according to the preset minimum value, otherwise; The terminal sends a service signal to the satellite according to the signal transmission power.

[0048] Of course, it is also possible to first determine whether the signal transmission power is lower than the preset minimum value, and then determine whether the signal transmission power exceeds the preset maximum value. This does not affect the implementation of the technical solution and the realization of the technical effect.

[0049] In this way, according to the method provided by the present invention, the terminal can match the appropriate signal transmission power according to the distance from the satellite. For satellites at farther locations, a stronger signal transmission power is used, and for satellites at closer locations, a weaker signal transmission power is used, thereby achieving power saving while ensuring system reliability.

[0050] Embodiment 3 An electronic device, such as Figure 6 As shown, it includes a memory storing executable program code and a processor coupled to the memory; wherein the processor calls the executable program code stored in the memory to execute the method steps disclosed in the above embodiment.

[0051] Embodiment 4 A computer storage medium stores a computer program, and when the computer program is executed by a processor, the method steps disclosed in the above embodiment are executed.

[0052] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0053] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0054] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0055] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are descriptions of the structure of the present invention based on the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0056] The "first" and "second" in this technical solution are only used to distinguish the names of the same or similar structures, or corresponding structures with similar functions, and are not an arrangement of the importance of these structures, nor do they have a ranking, comparison of size, or other meanings.

[0057] In addition, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the two structures. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on the overall idea of ​​the present invention and the specific context of the present solution.

[0058] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A power control method for a satellite communication system based on 5G technology, the method being applied to a satellite in a satellite communication system, characterized in that: The method comprises the following steps: The satellite determines the current service beam position according to the beam position scheduling situation; The satellite determines the distance between the satellite and the current service beam position based on the ephemeris information; The satellite calculates the signal transmission power according to the Friis formula, the distance and the preset signal reception power; The satellite sends a service beam to the current service beam position according to the signal transmission power.

2. The method according to claim 1, characterized in that: Before the satellite sends the service beam to the current service beam position according to the signal transmission power, the following steps are also included: The satellite determines whether the signal transmission power exceeds a preset maximum value; If yes, the satellite sends a service beam to the current service beam position according to the preset maximum value, otherwise the satellite continues to determine whether the signal transmission power is lower than the preset minimum value; If yes, the satellite sends a service beam to the current service beam position according to the preset minimum value; otherwise, the satellite sends a service beam to the current service beam position according to the signal transmission power.

3. A power control method for a satellite communication system based on 5G technology, the method being applied to a terminal in a satellite communication system, characterized in that: The method comprises the following steps: The terminal determines the satellite-to-earth distance between the terminal and the satellite based on the ephemeris information; The terminal satellite calculates the signal transmission power according to the Friis formula, the satellite-to-ground distance and the preset signal reception power; The terminal sends a service signal to the satellite according to the signal transmission power.

4. The method according to claim 3, characterized in that: Before the terminal sends the service signal to the satellite according to the signal transmission power, the following steps are also included: The terminal determines whether the signal transmission power exceeds a preset maximum value; If yes, the terminal sends a service signal to the satellite according to the preset maximum value, otherwise the terminal continues to determine whether the signal transmission power is lower than the preset minimum value; If yes, the terminal sends the service signal to the satellite according to the preset minimum value; otherwise, the terminal sends the service signal to the satellite according to the signal transmission power.

5. An electronic device, characterized in that: It comprises a memory storing executable program code and a processor coupled to the memory; wherein the processor calls the executable program code stored in the memory to execute the method according to any one of claims 1-4.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is performed.

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