Resource allocation method and device for feed link of low earth orbit satellite system

Abstract

The invention relates to the field of satellite communication, and discloses a resource allocation method and device for a feed link of a low-orbit satellite system, which improve the availability of a low-orbit constellation QV frequency band feed link, the method comprises the following steps: dividing a target area into a plurality of ground fixed cells in advance, each ground fixed cell being capable of selecting at least two different ground stations; pre-calculating and generating a plurality of sets of resource allocation strategy data based on assumed different ground station availability conditions; the network control center judges whether the ground station is available at present according to the meteorological condition and the channel quality so as to select proper resource allocation strategy data to obtain first strategy data; the network control center transmits the first strategy data to a ground station and a satellite control center; the ground station allocates resources according to the first policy data, and monitors channel quality at the same time; and the satellite control center generates a remote control task operation plan according to the first strategy data, performs operation and uploads the first strategy data to the satellite, and the satellite allocates resources.

Description

Technical Field

[0001] The present application relates to the field of satellite communications, and in particular to a resource allocation technology for a feeder link of a low-orbit satellite system. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the present application as recited in the claims. The description herein is not admitted to be prior art as disclosed by virtue of its inclusion in this section.

[0003] 1. Satellite communication system reliability

[0004] The reliability of satellite communication systems is usually characterized by the availability of equipment in each subsystem and the lines between subsystems. Availability refers to the probability that the system will work normally at any time, which can be calculated using the system's mean time between failures (MTBF) and mean time to repair (MTTR):

[0005] Availability A = MTBF / (MTBF+MTTR)

[0006] Satellite communication systems are generally composed of three parts: user segment, space segment, and ground segment. The overall availability of the system needs to consider not only the availability of the three subsystems of user segment, space segment, and ground segment, but also the availability of the user link between the user segment and the space segment and the availability of the feeder link between the space segment and the ground segment. If the availability of the above items is marked as A1, A2, A3, A4, and A5 respectively, the availability of the entire system can be expressed as:

[0007] System availability A=A1A2A3A4A5

[0008] It can be seen that the overall availability of the satellite communication system is determined by the subsystem with the lowest availability in the system. Therefore, when designing the system, we should first focus on the part that is most difficult to improve the availability index, such as the air interface link and the space segment.

[0009] 2. Current status and existing problems of low-orbit satellite spectrum resources

[0010] In the field of satellite communications, traditional S, ku, and ka spectrum resources are already very tight. For low-orbit satellite communication systems, in order to obtain more spectrum resources, the QV band on the feed side is a good choice. However, the fatal disadvantage of the QV band is that the rain attenuation is very large, up to tens or even hundreds of dB, which seriously affects the availability of the entire satellite system.

[0011] According to the traditional design idea, the link budget margin is increased by increasing the power amplifier to achieve the link availability of the system design. This method has a better effect in low frequency bands such as S and ku. For the QV band, it is obviously not a good choice. The economic benefits are very low and it does not meet the requirements of the global low-carbon environmental protection environment.

[0012] 3. Disadvantages of the Existing Technology

[0013] The satellite feeder link frequency band is higher than the user link frequency band. When rainfall reaches a certain level, the feeder link is interrupted before the user link. At this time, the user link is connected to a special small gateway station, and the user link data is transmitted back to the core network through the small gateway station. This method has three disadvantages: first, it is not suitable for low-orbit constellations in TP mode; second, the space base station protocol needs to be specially customized so that the user link has a backhaul function; third, it is not suitable for large-scale networking scenarios. Summary of the invention

[0014] The purpose of the present application is to provide a method and device for allocating resources of a feeder link of a low-orbit satellite system, thereby improving the availability of the QV band feeder link of a low-orbit constellation.

[0015] The present application discloses a resource allocation method for a feeder link of a low-orbit satellite system, comprising:

[0016] Divide the target area into a plurality of ground fixed cells in advance, wherein each ground fixed cell can select at least two different ground stations; pre-calculate and generate a plurality of sets of resource allocation strategy data for the target area based on different assumed ground station availability;

[0017] The network control center determines whether the ground station covering the target area is currently available according to the meteorological conditions of the target area and the channel quality monitoring conditions, and selects appropriate resource allocation strategy data from the multiple sets of resource allocation strategy data according to the availability of the ground station to obtain the first strategy data;

[0018] The network control center transmits the first strategy data to the ground station and the satellite control center;

[0019] The ground station allocates resources according to a portion of the first strategy data related to the ground station, while monitoring channel quality;

[0020] The satellite control center generates a remote control mission operation plan based on the satellite-related part of the first strategy data, performs operations according to the plan, injects the first strategy data to the satellite, and the satellite allocates resources according to the first strategy data.

[0021] In a preferred example, the step of calculating and generating multiple sets of resource allocation strategy data for the target area specifically includes:

[0022] Determine the currently available ground stations;

[0023] Allocating an available ground station to each of the ground fixed cells, determining a one-to-one mapping relationship between the ground fixed cells and the available ground stations, and generating a ground fixed cell list;

[0024] If the current time is T, reset the cell list and determine whether the cell list is empty; if the cell list is empty, update T to T+1; if the cell list is not empty, select one of the fixed cells in order and determine whether the fixed cell has allocated resources;

[0025] If the fixed cell has not allocated resources, satellite beam resources are allocated; if no suitable satellite is found, satellite selection fails; if satellite selection succeeds, or the fixed cell has allocated resources, calculate and determine whether the link margin meets the conditions;

[0026] If the link margin meets the condition, the fixed cell allocation is successful; if the link margin does not meet the condition, the fixed cell allocation fails, and the beam resource of the satellite currently allocated to the fixed cell is increased by one;

[0027] If the fixed cell allocation is successful, the fixed cell is deleted from the cell list, and then it is determined again whether the cell list is empty; or after the fixed cell allocation fails, it is determined again whether the cell list is empty, until a set of resource allocation strategy data is formed;

[0028] Multiple sets of resource allocation strategy data are generated from a fixed cell list at multiple times when multiple ground stations are available.

[0029] In a preferred example, when the network control center finds that the availability of the current ground station has changed based on the real-time channel quality fed back by the ground station, or when the weather conditions in the target area have changed, the resource allocation strategy data is reselected.

[0030] In a preferred example, the multiple sets of resource allocation policy data include conventional resource allocation policy data and multiple sets of backup resource allocation policy data;

[0031] The conventional resource allocation strategy data includes strategy data for allocating the nearest ground station to each ground fixed cell;

[0032] The backup resource allocation strategy data includes strategy data for allocating second-layer rain attenuation backup layer ground stations to some ground fixed cells whose availability still does not meet the ground station coverage requirement after allocating the available first-layer basic coverage layer ground stations.

[0033] In a preferred example, the ground stations of the first basic coverage layer are evenly distributed in the region, and the ground stations of the second rain attenuation backup layer are close to the ground stations of the first basic coverage layer whose availability does not meet the requirements under the premise of satisfying the rain attenuation irrelevant characteristics;

[0034] The second-layer rain attenuation backup layer ground station and the first-layer basic coverage layer ground station back up each other and jointly cover the heavy rain attenuation area;

[0035] The ground station also includes a third-layer capacity enhancement layer ground station, which is determined according to user distribution, covers high-density areas, shares user traffic, and is used as a second-layer rain attenuation backup layer ground station when necessary.

[0036] In a preferred example, the step of allocating satellite beam resources specifically includes:

[0037] Find satellites that are simultaneously visible to the ground fixed cell and its assigned ground station, calculate the duration for which the satellites are simultaneously visible, generate a list of visible satellites and sort them by the visible duration;

[0038] The satellite with the longest visible time is selected from the visible satellite list, and it is determined whether the satellite beam resource is 0. If not, the satellite selection is successful, and the satellite is allocated to the ground fixed cell. The satellite beam resource is reduced by one. If it is 0, the next satellite is selected from the visible satellite list for determination.

[0039] In a preferred example, the step of calculating and determining whether the link margin meets the conditions specifically includes:

[0040] If the ratio of the energy of each symbol of the entire link to the noise power spectrum density is greater than the threshold value, and the elevation angle of the terminal user in the fixed cell and the elevation angle of the ground station allocated to the ground fixed cell are both greater than the minimum elevation angle, then the link margin meets the condition, otherwise the link margin does not meet the condition;

[0041] The entire link includes a feeder link and a user link.

[0042] In a preferred example, the basis for judging whether the ground station is available is that when the quality of the feeder link channel of the ground station, that is, the ratio of the energy of each symbol to the noise power spectrum density, deteriorates to below 0 dB and lasts for more than 10 minutes, the ground station is unavailable, otherwise the ground station is available;

[0043] When a certain ground station is unavailable, the network control center reselects appropriate resource allocation strategy data to obtain first strategy data; the network control center transmits the first strategy data to the ground station and the satellite control center.

[0044] The present application also discloses a resource allocation device for a feeder link of a low-orbit satellite system, comprising:

[0045] a memory for storing computer executable instructions; and,

[0046] A processor, coupled to the memory, is configured to implement the steps in the method described above when executing the computer executable instructions.

[0047] The present application also discloses a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, the steps in the method described above are implemented.

[0048] In the implementation manner of the present application, by reasonably selecting ground stations, a higher network availability can be achieved without significantly increasing the number of ground stations, which is a very economical, efficient and environmentally friendly method.

[0049] The specification of the present application records a large number of technical features, which are distributed in various technical solutions. If all possible combinations of technical features of the present application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of the present application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions should all be regarded as having been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be regarded as having been recorded because it is technically infeasible, and the solution of A+B+C+E should be regarded as having been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic diagram of a process of switching available ground stations according to an embodiment of the present application;

[0051] Figure 2 is a schematic diagram of a process for generating resource allocation strategy data according to an embodiment of the present application;

[0052] Figure 3 is a schematic diagram of a process of allocating satellite beam resources according to an embodiment of the present application;

[0053] Figure 4 is a schematic diagram of backup station switching according to an embodiment of the present application;

[0054] Figure 5 is a schematic diagram of cell coverage of a rain attenuation backup station according to an embodiment of the present application;

[0055] Figure 6 This is a schematic diagram of a three-layer coverage network of the ground segment according to an embodiment of the present application. DETAILED DESCRIPTION

[0056] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0057] Description of some concepts:

[0058] Feeder link: A two-way link between a satellite and a ground station in a satellite communication system. In a satellite communication system, a feeder link is the communication link between a satellite and a ground station, while the communication link between a communication satellite and a user terminal is called a user link. In a feeder link, the satellite and the ground station point to each other using coordinate control information transmitted on the feeder link.

[0059] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0060] The first implementation mode of the present application relates to a resource allocation method for a feeder link of a low-orbit satellite system, and the process is as follows: Figure 1 As shown, the method comprises the following steps:

[0061] Step 1: pre-dividing the target area into a plurality of ground fixed cells, wherein each ground fixed cell can select at least two different ground stations; pre-calculating and generating a plurality of sets of resource allocation strategy data for the target area based on the assumed availability of different ground stations;

[0062] Determine the cell division of the target area, such as using the H3 algorithm to divide the target area into regular hexagonal ground fixed cells with a diameter of 100 kilometers.

[0063] In one embodiment, the step of calculating and generating multiple sets of resource allocation strategy data for the target area is as follows: Figure 2 As shown, specifically including:

[0064] Step 101, determining currently available ground stations;

[0065] Step 102, assigning an available ground station to each ground fixed cell, determining a one-to-one mapping relationship between the ground fixed cells and the available ground stations, and generating a ground fixed cell list;

[0066] Step 103: If the current time is T, reset the cell list; the purpose of resetting the terrestrial fixed cell list is to avoid outdated or inaccurate information in the cell list, thereby affecting the efficiency and accuracy of resource allocation;

[0067] Step 104, determine whether the cell list is empty;

[0068] Step 105: If the cell list is empty, update T to T+1;

[0069] Step 106, if the cell list is not empty, select one of the fixed cells in order;

[0070] Step 107, determining whether the fixed cell has allocated resources;

[0071] Step 108: If the fixed cell has not allocated resources, allocate satellite beam resources M sati ;

[0072] In one embodiment, the satellite beam resources M are allocated sati Steps such as Figure 3 As shown, specifically including:

[0073] Step 201, searching for satellites that are simultaneously visible to the ground fixed cell and its assigned ground station, and calculating the duration of the simultaneous visible satellites;

[0074] Step 202, generate a visible satellite list Satlist and sort it by visibility duration;

[0075] Step 203: Select the satellite with the longest visible time from the visible satellite list Satlist. i ;

[0076] Step 204: Determine the satellite beam resource M sati Is it 0?

[0077] Step 205: If it is not 0, the satellite selection is successful, a satellite is allocated to the ground fixed cell, and the satellite beam resource is reduced by one. sati -1;

[0078] Step 206: If it is 0, the satellite is deleted from the visible satellite list Satlist, and the next satellite is selected from the visible satellite list Satlist for judgment.

[0079] Step 109, determine the satellite beam resource M satiWhether the allocation is successful. If no suitable satellite is found, the satellite selection fails;

[0080] Step 110, if the satellite selection is successful, or the fixed cell has allocated resources, calculate and determine whether the link margin meets the conditions;

[0081] In one embodiment, the step of calculating and determining whether the link margin meets the condition specifically includes:

[0082] If the ratio of the energy of each symbol of the entire link to the noise power spectrum density Es / N0 is greater than the threshold value, and the elevation angle θ of the terminal user in the fixed cell ti and the ground station elevation angle θ allocated to the ground fixed cell gi If both are greater than the minimum elevation angle, the link margin meets the condition, otherwise the link margin does not meet the condition;

[0083] Es / N0 is one of the main indicators of satellite link transmission quality, which is used to measure the strength of the signal and the strength of the noise. In satellite communication systems, the larger the Es / N0 value of the link, the greater the signal strength, the smaller the noise strength, and the better the link transmission quality.

[0084] The entire link consists of a feeder link and a user link.

[0085] like Figure 4 As shown, in a satellite communication system, the entire link refers to the link connection between the mobile terminal and the satellite, the feeder link is the communication link between the satellite and the ground station, and the communication link between the communication satellite and the user terminal is called the user link.

[0086] Step 111, if the link margin meets the conditions, the fixed cell allocation is successful;

[0087] Step 112: If the link margin does not meet the condition, the fixed cell allocation fails, and the beam resource of the satellite currently allocated to the fixed cell is increased by one, M sati +1;

[0088] Step 113: if the fixed cell is allocated successfully, deleting the fixed cell from the cell list;

[0089] Return to step 104 and determine again whether the cell list is empty;

[0090] Or after the fixed cell allocation fails, return to step 104 to determine again whether the cell list is empty until a set of resource allocation strategy data is formed;

[0091] Multiple sets of resource allocation strategy data are generated from a fixed cell list at multiple times when multiple ground stations are available.

[0092] In one embodiment, Figure 5As shown, the multiple sets of resource allocation policy data include conventional resource allocation policy data and multiple sets of backup resource allocation policy data;

[0093] Conventional resource allocation strategy data includes strategy data for allocating the nearest ground station to each ground fixed cell. A three-layer coverage network is established for the ground segment. The network control center assumes that all three layers of sites are available, and allocates a ground station to each ground fixed cell according to the set principle, determines the one-to-one mapping relationship between ground stations and ground fixed cells, calculates the current visible satellite operation status, selects the satellite with the longest visible time and allocates it to each pair of ground stations and ground fixed cells, and generates a conventional resource allocation strategy.

[0094] The backup resource allocation strategy data includes the strategy data for allocating the second-layer rain-fading backup layer ground stations to some ground fixed cells whose availability still does not meet the ground station coverage requirements after allocating the available first-layer basic coverage layer ground stations. The network control center assumes that some stations in the basic coverage layer become unavailable due to rainfall, excludes these stations, re-executes the above-mentioned ground station allocation and satellite selection process, and generates a backup resource allocation strategy.

[0095] In one embodiment, Figure 6 As shown, the three-layer coverage network of the ground segment is the basic coverage layer, the rain attenuation backup layer, and the capacity enhancement layer.

[0096] First, determine the target range to be covered. The area to be covered is S t , and obtain the preliminary planning of ground segment sites.

[0097] The ground stations in the first basic coverage layer are evenly distributed in the region to achieve full coverage. Assuming that the minimum elevation angle of the ground station is θ, the corresponding maximum coverage radius of the ground station is R. d According to S t and R d Calculate the number of ground stations N1 required for the first basic coverage layer. Ensure that each target area can be covered by one of the ground stations, and then select the surrounding areas with low rain attenuation.

[0098] The second-layer rain attenuation backup layer ground station is close to the first-layer basic coverage layer ground station whose availability does not meet the requirements under the premise of meeting the rain attenuation irrelevant characteristics; specifically, in the heavy rain attenuation area, the feeder link availability of the ground station does not meet the index requirements, and rain attenuation backup sites are added for these sites. The number of backup sites required for a single site is determined by the availability set by the system, and the backup site must meet the following conditions: 1. The distance from the backed-up site is greater than 1,000 kilometers to ensure rain attenuation irrelevant; 2. The closer the distance to the backed-up site, the better, to maximize the overlapping coverage area; 3. Select a location with small rain attenuation. According to the above operations, the number of rain attenuation backup layer sites N2 is determined.

[0099] The second-layer rain attenuation backup layer ground stations and the first-layer basic coverage layer ground stations back up each other and jointly cover the heavy rain attenuation area;

[0100] The ground stations also include the third-layer capacity enhancement layer ground stations. The third-layer capacity enhancement layer ground stations are determined according to user distribution, cover high-density areas, share user traffic, and are used as second-layer rain attenuation backup layer ground stations when needed.

[0101] Step 2: The network control center determines whether the ground station covering the target area is currently available according to the meteorological conditions of the target area and the channel quality monitoring conditions, and selects appropriate resource allocation strategy data from multiple sets of resource allocation strategy data according to the availability of the ground station to obtain first strategy data;

[0102] When a certain ground station is unavailable, the network control center reselects appropriate resource allocation strategy data to obtain first strategy data.

[0103] In one embodiment, the basis for determining whether the ground station is available is that when the quality of the ground station feeder link channel, that is, the ratio of the energy of each symbol to the noise power spectrum density, deteriorates to below 0 dB and lasts for more than 10 minutes, the ground station is unavailable, otherwise the ground station is available;

[0104] Step 3, the network control center transmits the first strategy data to the ground station and the satellite control center;

[0105] Optionally, the network control center may send only the portion of the first strategy data related to the ground station to the ground station, and send the portion related to the satellite to the satellite control center.

[0106] Step 4, the ground station allocates resources according to the part of the first strategy data related to the ground station, and monitors the channel quality at the same time;

[0107] Step 5: The satellite control center generates a remote control mission operation plan based on the satellite-related part of the first strategy data, performs operations according to the plan, and injects the first strategy data to the satellite. The satellite allocates resources according to the first strategy data.

[0108] Optionally, the satellite control center may upload only the satellite-related portion of the first strategy data to the satellite.

[0109] In one embodiment, assuming that two ground stations with 90% availability cover the same area, the availability of the area is increased to 99%. By reasonably selecting the site distribution and using the backup site method, the system availability is greatly improved. This method is both economical and effective, and is very suitable for TP mode low-orbit constellations.

[0110] Feed availability A5 = 1-(1-a ground station 1)*(1-a ground station 2)

[0111] =1-(1-90%)*(1-90%)

[0112] =99%

[0113] In one embodiment, step 6 is further included, when the network control center finds that the availability of the current ground station has changed according to the real-time channel quality fed back by the ground station, or when the weather conditions in the target area have changed, the resource allocation strategy data is reselected.

[0114] It should be noted that those skilled in the art should understand that the implementation functions of each module shown in the implementation method of the resource allocation device for the feed link of the low-orbit satellite system can be understood by referring to the relevant description of the resource allocation of the feed link of the low-orbit satellite system. The functions of each module shown in the implementation method of the resource allocation device for the feed link of the low-orbit satellite system can be implemented by a program (executable instruction) running on a processor, or by a specific logic circuit. If the resource allocation device for the feed link of the low-orbit satellite system in the embodiment of the present application is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application can be essentially or partly reflected in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM, Read Only Memory), a disk or an optical disk. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.

[0115] Accordingly, the present application also provides a computer-readable storage medium in which computer executable instructions are stored, and when the computer executable instructions are executed by the processor, the various method embodiments of the present application are implemented. Computer-readable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be a computer-readable instruction, a data structure, a module of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable storage media do not include temporary computer-readable media (transitory media), such as modulated data signals and carriers.

[0116] In addition, the embodiment of the present application also provides a resource allocation device for a feeder link of a low-orbit satellite system, which includes a memory for storing computer executable instructions, and a processor; the processor is used to implement the steps in the above-mentioned method implementation methods when executing the computer executable instructions in the memory. Among them, the processor can be a central processing unit (Central Processing Unit, referred to as "CPU"), or other general-purpose processors, digital signal processors (Digital Signal Processor, referred to as "DSP"), Application Specific Integrated Circuit (Application Specific Integrated Circuit, referred to as "ASIC"), etc. The aforementioned memory can be a read-only memory (read-only memory, referred to as "ROM"), a random access memory (random access memory, referred to as "RAM"), a flash memory (Flash), a hard disk or a solid-state hard disk, etc. The steps of the method disclosed in each embodiment of the present invention can be directly embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0117] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0118] All documents mentioned in this specification are considered to be included in the disclosure of this application as a whole, so that they can be used as a basis for modification when necessary. In addition, it should be understood that the above is only a preferred embodiment of this specification and is not intended to limit the scope of protection of this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of one or more embodiments of this specification.

[0119] In some cases, the actions or steps described in the claims may be performed in a different order than in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. A resource allocation method for a feeder link of a low-orbit satellite system, characterized in that: include: Dividing the target area into a plurality of ground fixed cells in advance, wherein each ground fixed cell can select at least two different ground stations; Pre-calculate and generate multiple sets of resource allocation strategy data for the target area based on different assumed ground station availability situations; The network control center determines whether the ground station covering the target area is currently available according to the meteorological conditions of the target area and the channel quality monitoring conditions, and selects appropriate resource allocation strategy data from the multiple sets of resource allocation strategy data according to the availability of the ground station to obtain the first strategy data; The network control center transmits the first strategy data to the ground station and the satellite control center; The ground station allocates resources according to a portion of the first strategy data related to the ground station, while monitoring channel quality; The satellite control center generates a remote control mission operation plan based on the satellite-related part of the first strategy data, performs operations according to the plan, injects the first strategy data to the satellite, and the satellite allocates resources according to the first strategy data.

2. The resource allocation method for a feeder link of a low-orbit satellite system according to claim 1, characterized in that: The step of calculating and generating multiple sets of resource allocation strategy data for the target area specifically includes: Determine the currently available ground stations; Allocating an available ground station to each of the ground fixed cells, determining a one-to-one mapping relationship between the ground fixed cells and the available ground stations, and generating a ground fixed cell list; If the current time is T, reset the cell list and determine whether the cell list is empty; if the cell list is empty, update T to T+1; if the cell list is not empty, select one of the fixed cells in order and determine whether the fixed cell has allocated resources; If the fixed cell has not allocated resources, satellite beam resources are allocated; if no suitable satellite is found, satellite selection fails; if satellite selection succeeds, or the fixed cell has allocated resources, calculate and determine whether the link margin meets the conditions; If the link margin meets the condition, the fixed cell allocation is successful; if the link margin does not meet the condition, the fixed cell allocation fails, and the beam resource of the satellite currently allocated to the fixed cell is increased by one; If the fixed cell allocation is successful, the fixed cell is deleted from the cell list, and then it is determined again whether the cell list is empty; or after the fixed cell allocation fails, it is determined again whether the cell list is empty, until a set of resource allocation strategy data is formed; Multiple sets of resource allocation strategy data are generated from a fixed cell list at multiple times when multiple ground stations are available.

3. The resource allocation method for a feeder link of a low-orbit satellite system according to claim 1, characterized in that: When the network control center finds that the availability of the current ground station changes according to the real-time channel quality fed back by the ground station, or when the weather conditions in the target area change, the resource allocation strategy data is reselected.

4. The resource allocation method for a feeder link of a low-orbit satellite system according to claim 2, characterized in that: The multiple sets of resource allocation policy data include conventional resource allocation policy data and multiple sets of backup resource allocation policy data; The conventional resource allocation strategy data includes strategy data for allocating the nearest ground station to each ground fixed cell; The backup resource allocation strategy data includes strategy data for allocating second-layer rain attenuation backup layer ground stations to some ground fixed cells whose availability still does not meet the ground station coverage requirement after allocating the available first-layer basic coverage layer ground stations.

5. The resource allocation method for the feeder link of the low-orbit satellite system according to claim 4, characterized in that: The ground stations of the first basic coverage layer are evenly distributed in the region, and the ground stations of the second rain attenuation backup layer are close to the ground stations of the first basic coverage layer whose availability does not meet the requirements under the premise of satisfying the rain attenuation irrelevant characteristics; The second-layer rain attenuation backup layer ground station and the first-layer basic coverage layer ground station back up each other and jointly cover the heavy rain attenuation area; The ground station also includes a third-layer capacity enhancement layer ground station, which is determined according to user distribution, covers high-density areas, shares user traffic, and is used as a second-layer rain attenuation backup layer ground station when necessary.

6. The resource allocation method for a feeder link of a low-orbit satellite system according to claim 2, characterized in that: The step of allocating satellite beam resources specifically includes: Find satellites that are simultaneously visible to the ground fixed cell and its assigned ground station, calculate the duration for which the satellites are simultaneously visible, generate a list of visible satellites and sort them by the visible duration; The satellite with the longest visible time is selected from the visible satellite list, and it is determined whether the satellite beam resource is 0. If not, the satellite selection is successful, and the satellite is allocated to the ground fixed cell. The satellite beam resource is reduced by one. If it is 0, the next satellite is selected from the visible satellite list for determination.

7. The resource allocation method for a feeder link of a low-orbit satellite system according to claim 2, characterized in that: The step of calculating and judging whether the link margin meets the conditions specifically includes: If the ratio of the energy of each symbol of the entire link to the noise power spectrum density is greater than the threshold value, and the elevation angle of the terminal user in the fixed cell and the elevation angle of the ground station allocated to the ground fixed cell are both greater than the minimum elevation angle, then the link margin meets the condition, otherwise the link margin does not meet the condition; The entire link includes a feeder link and a user link.

8. The resource allocation method for a feeder link of a low-orbit satellite system according to any one of claims 1 to 7, characterized in that: Whether the ground station is available is determined based on that when the feeder link channel quality of the ground station, that is, the ratio of the energy of each symbol to the noise power spectrum density, deteriorates to below 0 dB and lasts for more than 10 minutes, the ground station is unavailable, otherwise the ground station is available; When a certain ground station is unavailable, the network control center reselects appropriate resource allocation strategy data to obtain first strategy data; the network control center transmits the first strategy data to the ground station and the satellite control center.

9. A resource allocation device for a feeder link of a low-orbit satellite system, characterized in that: include: A memory for storing computer executable instructions; as well as, A processor, coupled to the memory, configured to implement the steps of the method according to any one of claims 1 to 8 when executing the computer executable instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the steps in the method according to any one of claims 1 to 8 are implemented.

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