A satellite-ground spectrum sharing method, device, apparatus and readable storage medium

Abstract

The application provides a satellite-terrestrial spectrum sharing method, device and equipment and a readable storage medium, and belongs to the technical field of communication. The satellite-terrestrial spectrum sharing method comprises the following steps: acquiring low-orbit satellite network information and ground cellular network information in a first time slot period, wherein the first time slot period comprises at least one time slot; obtaining a constraint target and a constraint condition of satellite-terrestrial spectrum sharing according to the low-orbit satellite network information and the ground cellular network information; obtaining a service beam in each beam cluster in a plurality of beam clusters in the first time slot period and a service time slot corresponding to the service beam in the first time slot period according to the constraint target and the constraint condition; each beam cluster comprises at least one low-orbit satellite beam, and the service beam is at least one beam in the at least one low-orbit satellite beam. According to the application, the low-orbit satellite network information and the ground cellular network information are considered, a beam hopping pattern is designed, and the application of the beam hopping technology in the satellite-terrestrial frequency sharing scene is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to a satellite-ground spectrum sharing method, device, equipment and readable storage medium. BACKGROUND

[0002] Currently, satellite communication networks and ground cellular networks generally adopt different frequency construction methods to avoid system interference risks and reduce deployment difficulties. However, the low-frequency band below 6 GHz suitable for mobile direct satellite scenarios is in short supply, and the spectrum resource utilization rate is low, making it difficult to allocate a separate frequency band for low-orbit satellite networks. Satellite-ground spectrum sharing is a potential solution, but it needs to avoid serious satellite-ground co-frequency interference.

[0003] Traditional satellite communication systems are mostly fixed beams, but the distribution and demand of services are non-uniform, which leads to a mismatch between the resources allocated by the satellite communication system and the service demand, resulting in low network resource utilization. In order to improve resource utilization, new broadband satellite systems tend to use hop-beam technology, which can allocate resources in space, time, frequency and power dimensions to adapt to the non-uniform distribution and dynamic changes of services, so the resource allocation based on hop-beam becomes more real-time and dynamic, but the calculation complexity also increases. The application scenario of hop-beam technology is generally to provide broadband access services for ground users by high-throughput satellites. Existing satellite hop-beam resource optimization mainly focuses on the forward link. As a payload, the beam can hop according to the hop-beam pattern in all cells. Each beam of the hop-beam satellite system can use the entire bandwidth of the satellite. The satellite hop-beam technology started early, but was limited by the development of antenna technology. Therefore, the satellite hop-beam technology can become a research focus, but its practical application is not much.

[0004] In summary, considering the scarcity of frequency resources and the strong satellite-ground co-frequency interference, resource allocation with high spectrum efficiency and low co-frequency interference has attracted widespread attention. The hop-beam-oriented resource allocation scheme mainly considers the flexible allocation of hop-beam in time, frequency, power and space dimensions. For the low earth orbit (LEO) satellite and ground co-frequency sharing scenario, the existing scheme does not consider introducing hop-beam technology. The multi-beam satellite system lacks time-domain scheduling of spectrum resources, and the cognitive radio technology needs to increase many sensing nodes. Moreover, the existing hop-beam technology scheme mostly considers single system or non-geostationary orbit (NGO) satellite and geostationary earth orbit (GSO) between the hop-beam spectrum sharing strategy, and does not consider the important scenario of satellite-ground spectrum sharing. SUMMARY

[0005] The technical scheme of the present application aims to provide a satellite-ground spectrum sharing method, device, equipment and readable storage medium, and solve the problem that the existing beam hopping technology is not applied in the satellite-ground frequency sharing scenario.

[0006] To solve the above technical problems, the present application provides the following technical scheme:

[0007] The present application provides a satellite-ground spectrum sharing method, comprising:

[0008] Obtaining low-orbit satellite network information and ground cellular network information in a first time slot period, the first time slot period comprising at least one time slot;

[0009] According to the low-orbit satellite network information and the ground cellular network information, obtaining a constraint target and a constraint condition of satellite-ground spectrum sharing;

[0010] According to the constraint target and the constraint condition, obtaining a service beam in each beam cluster in a plurality of beam clusters in the first time slot period and a service time slot corresponding to the service beam in the first time slot period;

[0011] Each beam cluster comprises at least one low-orbit satellite beam, and the service beam is at least one beam in the at least one low-orbit satellite beam.

[0012] Optionally, the low-orbit satellite network information comprises at least one of the following:

[0013] The throughput of the low-orbit satellite network; the signal-to-interference ratio (SINR) of a satellite terminal in each time slot under each low-orbit satellite beam; the communication demand capacity of a satellite terminal under each low-orbit satellite beam; and the capacity of each low-orbit satellite beam.

[0014] The ground cellular network information comprises at least one of the following:

[0015] The throughput of the ground cellular network; and the SINR of a ground terminal in each time slot under each ground cell.

[0016] Optionally, the constraint target comprises that the throughput of the low-orbit satellite network and the throughput of the ground cellular network are maximum.

[0017] The constraint condition comprises at least one of the following:

[0018] The SINR of a ground terminal in each time slot under each ground cell is greater than a first preset value;

[0019] The SINR of a satellite terminal in each time slot under each low-orbit satellite beam is greater than a second preset value.

[0020] A communication demand capacity of a satellite terminal under each low-orbit satellite beam is less than a capacity of a corresponding low-orbit satellite beam;

[0021] The number of the service beams is greater than or equal to the number of the beam clusters;

[0022] The number of the service beams in one time slot is less than or equal to 1.

[0023] Optionally, the low-orbit satellite network information in the first time slot period is acquired, including:

[0024] According to the ephemeris information of the low-orbit satellite and the position information of the ground cellular base station, a target distance between the low-orbit satellite and the ground cellular base station and an antenna off-axis angle of the low-orbit satellite are obtained;

[0025] According to the target distance, the antenna off-axis angle, a transmission power of a first beam allocated by the low-orbit satellite, a useful signal power received by a satellite terminal and an inter-beam interference signal power, an antenna gain of a second beam on the first beam is obtained;

[0026] According to the antenna gain of the second beam on the first beam, a satellite terminal gain average value under the second beam is obtained;

[0027] According to the satellite terminal gain average value and an interference factor of the second beam on a first ground cell, a SINR of a satellite terminal under the second beam in each time slot is obtained;

[0028] The first beam is any beam in the low-orbit satellite beams, the second beam is any beam in the low-orbit satellite beams except the first beam, and the first ground cell is any ground cell. In the case that the first time slot period is the first time slot period, the interference factor of the second beam on the first ground cell is a preset interference factor. In the case that the first time slot period is not the first time slot period, the interference factor of the second beam on the first ground cell is determined according to a service beam in each beam cluster in at least one beam cluster in a second time slot period and a service time slot corresponding to the service beam in the second time slot period. The second time slot period is a time slot period before the first time slot period.

[0029] Optionally, the satellite terminal gain average value under the second beam is obtained according to the antenna gain of the second beam on the first beam, including:

[0030] According to the antenna gain of the second beam on the first beam and a maximum gain of a satellite antenna, an interference coefficient between the second beam and the first beam is obtained. The maximum gain of the satellite antenna is determined according to the antenna off-axis angle;

[0031] According to the maximum gain and the interference coefficient, a satellite terminal gain average value under the second beam is obtained.

[0032] Optionally, the ground cellular network information in the first time slot period is acquired, including:

[0033] According to an interference factor of the third beam in the second ground cell, a SINR of a ground terminal in each time slot under each ground cell is obtained.

[0034] The third beam is any beam in the low-orbit satellite beam; the second ground cell is any ground cell; in the case that the first time slot period is the first time slot period, the interference factor of the third beam in the second ground cell is a preset interference factor, and in the case that the first time slot period is not the first time slot period, the interference factor of the third beam in the second ground cell is determined according to a service beam in each beam cluster in at least one beam cluster and a service time slot corresponding to the service beam in the first time slot period.

[0035] Optionally, the low-orbit satellite network information in the first time slot period is acquired, including:

[0036] According to the SINR of the satellite terminal in each time slot under each low-orbit satellite beam, a throughput of the low-orbit satellite network is obtained.

[0037] Optionally, the ground cellular network information in the first time slot period is acquired, including:

[0038] According to the SINR of the ground terminal in each time slot under each ground cell, a throughput of the ground cellular network is obtained.

[0039] Optionally, the method further includes:

[0040] In the case that the ground terminal transmits service at a first frequency corresponding to the service beam, the service of the ground terminal is adjusted to a second frequency for transmission.

[0041] Embodiments of the present application also provide a satellite-ground spectrum sharing device, including:

[0042] A first acquisition module is configured to acquire low-orbit satellite network information and ground cellular network information in a first time slot period, the first time slot period including at least one time slot;

[0043] A first processing module is configured to obtain a constraint target and a constraint condition of satellite-ground spectrum sharing according to the low-orbit satellite network information and the ground cellular network information;

[0044] The second processing module is configured to obtain, according to the constraint target and the constraint condition, a service beam in each beam cluster of a plurality of beam clusters in the first time slot period and a service time slot corresponding to the service beam in the first time slot period.

[0045] Each of the beam clusters comprises at least one low-orbit satellite beam, and the service beam is at least one of the at least one low-orbit satellite beam.

[0046] The embodiment of the present application also provides a satellite-ground spectrum sharing device, comprising a processor, a memory and a program stored in the memory and executable on the processor, and the program is executed by the processor to implement the satellite-ground spectrum sharing method in any one of the above.

[0047] The embodiment of the present application also provides a readable storage medium, and the readable storage medium stores a program, and the program is executed by a processor to implement the steps in the satellite-ground spectrum sharing method in any one of the above.

[0048] The above technical solution of the present application has at least one of the following advantages:

[0049] The satellite-ground spectrum sharing method provided by the present application obtains low-orbit satellite network information and ground cellular network information in a first time slot period, and obtains a constraint target and a constraint condition of satellite-ground spectrum sharing according to the low-orbit satellite network information and the ground cellular network information, and obtains a service beam in each beam cluster of a plurality of beam clusters in the first time slot period and a service time slot corresponding to the service beam in the first time slot period according to the constraint target and the constraint condition, that is, a beam hopping pattern in the first time slot period is generated, that is, the present application method considers the low-orbit satellite network information and the ground cellular network information, designs the beam hopping pattern, and realizes the application of the beam hopping technology in the satellite-ground frequency sharing scene. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 The satellite-ground spectrum sharing method provided by the present application provides a flowchart;

[0051] Figure 2 The satellite-ground spectrum sharing method provided by the present application provides a satellite and ground integrated networking coverage scene schematic diagram;

[0052] Figure 3 The satellite-ground spectrum sharing method provided by the present application provides a satellite multi-beam distribution and frequency multiplexing mode schematic diagram;

[0053] Figure 4 The satellite-ground spectrum sharing method provided by the present application provides a LEO and ground spectrum sharing network architecture schematic diagram;

[0054] Figure 5A satellite assembly application scenario schematic diagram provided by the embodiment of the present application is shown.

[0055] Figure 6 A traditional frequency reuse scheme schematic diagram provided by the embodiment of the present application is shown.

[0056] Figure 7 One of the schematic diagrams of the influence of inter-beam interference on system performance provided by the embodiment of the present application is shown.

[0057] Figure 8 The second schematic diagram of the influence of inter-beam interference on system performance provided by the embodiment of the present application is shown.

[0058] Figure 9 The capacity allocation situation schematic diagram of point beams with different beam activity under heavy load network provided by the embodiment of the present application is shown.

[0059] Figure 10 The capacity allocation situation schematic diagram of point beams with different beam activity under light load network provided by the embodiment of the present application is shown.

[0060] Figure 11 The square sum of the capacity and service duration difference of point beams with different beam activity under heavy load network provided by the embodiment of the present application is shown.

[0061] Figure 12 The square sum of the capacity and service duration difference of point beams with different beam activity under light load network provided by the embodiment of the present application is shown.

[0062] Figure 13 The structure schematic diagram of the satellite-ground spectrum sharing device provided by the embodiment of the present application is shown.

[0063] Figure 14 The structure schematic diagram of the satellite-ground spectrum sharing device provided by the embodiment of the present application is shown. DETAILED DESCRIPTION

[0064] In order to make the technical problems, technical solutions and advantages of the present application clearer, specific embodiments will be described in detail below with reference to the accompanying drawings.

[0065] In order to solve the problem that the existing hop beam technology is not applied in the satellite-ground frequency sharing scene, the embodiment of the present application provides a satellite-ground spectrum sharing method, device, equipment and readable storage medium.

[0066] As shown in Figure 1 The embodiment of the present application provides a satellite-ground spectrum sharing method, which comprises:

[0067] Step 101: Obtain low-orbit satellite network information and ground cellular network information in a first time slot period, wherein the first time slot period comprises at least one time slot.

[0068] It should be noted that the satellite-to-ground spectrum sharing method provided by the embodiment of the present application is applied to a low-orbit satellite and a cellular network dynamic spectrum sharing device facing a hopping beam, and the application scenario is a satellite and ground integrated networking coverage scenario, and a satellite and ground integrated networking coverage scenario is shown in Figure 2 The scenario includes a low-orbit satellite and a ground base station, and the scenario also includes a heavy traffic ground coverage area and a sporadic traffic satellite coverage area, and the relationship between the number of channels in a unit area corresponding to different coverage distances in the scenario is shown in Figure 2

[0069] First, a satellite and ground integrated networking spectrum sharing model is established, and the steps of establishing the model are as follows:

[0070] The satellite adopts a hopping beam, and to avoid inter-beam interference, S low-orbit satellite beams are assumed to be a beam cluster, and the frequency reuse factor is 7, and a satellite multi-beam distribution and frequency reuse mode is shown in Figure 3

[0071] The ground base station transmission power is p CGC , the low-orbit satellite transmission power is p S , the maximum ground terminal (or ground network terminal) transmission power is not less than 24dBm, and the minimum ground terminal (or ground network terminal) transmission power is not less than -30dBm, and the satellite terminal (or satellite network terminal) transmission power is constant at 24dBm;

[0072] It is assumed that the environment of the ground terminal is a city, and the environment of the satellite terminal is an open land, and a three-state model based on Markov chain is used for the satellite mobile channel model, wherein the fading of the satellite signal is mainly composed of free space path loss and shadow fading, and the shadow fading obeys a lognormal distribution, and the parameters of the distribution are related to the environment of the terminal:

[0073] The satellite terminal and the ground terminal user bandwidth are both 180KHz, the carrier frequency is 4GHz, the ground cell radius is R1, and the satellite beam radius is R2.

[0074] In the above satellite and ground integrated networking coverage scenario, the running time is set as a single period under a single time window, that is, a time slot period, the first time slot period is one of a plurality of time slot periods, each time slot period includes J time slots, J is an integer greater than or equal to 1, the low-orbit satellite beams are divided into S beam clusters, each beam cluster includes at least one low-orbit satellite beam, S is an integer greater than or equal to 1, and S is an integer greater than or equal to 1.

[0075] In this step, low-orbit satellite network information and ground cellular network information in the first time slot period are obtained, and the low-orbit satellite network information and the ground cellular network information are used for subsequent design of a hopping beam pattern in the first time slot period.​​

[0076] Step 102: Based on the low-orbit satellite network information and the ground cellular network information, obtain the constraint objectives and constraints for satellite-to-ground spectrum sharing.

[0077] In this step, based on the low-Earth orbit satellite network information and the ground cellular network information, the constraints and conditions for satellite-to-ground spectrum sharing using hopping beam technology in the low-Earth orbit satellite and cellular network dynamic spectrum sharing device oriented towards hopping beam are obtained.

[0078] Step 103: Based on the constraint target and the constraint conditions, obtain the serving beam in each of the multiple beam clusters in the first time slot period and the service time slot in the first time slot period corresponding to the serving beam; wherein, each beam cluster includes at least one low-Earth orbit satellite beam, and the serving beam is at least one beam among the at least one low-Earth orbit satellite beam.

[0079] In this step, under the aforementioned constraints and conditions, within the first time slot period, the optimal low-Earth orbit satellite beam is selected as the serving beam from the low-Earth orbit satellite beams of each of the Y beam clusters, and the corresponding service time slot for each serving beam is determined.

[0080] Optionally, in this embodiment of the invention, it is represented in the form of matrix T, which is a matrix of wave positions and corresponding service time slots:

[0081]

[0082] Element T in the matrix i,j This indicates whether the i-th spectral bit is lit in the j-th time slot (i.e., there is beam service). Its value is 0 or 1. When it is 1, it means that the corresponding spectral bit is served by the beam in that time slot. When it is 0, it means that the spectral bit is not served in that time slot. At most B beams can serve simultaneously in the same time slot, that is, B spectral bits can be lit at the same time.

[0083] Once the matrix T for the first time slot period is determined, the matrix T for that time slot period is carried over to the next time slot period until the matrix T corresponding to all time slots is determined.

[0084] Optionally, the low-Earth orbit satellite network information includes at least one of the following:

[0085] Throughput of the low-Earth orbit (LEO) satellite network; Signal-to-Interference-plus-Noise Ratio (SINR) of satellite terminals in each time slot under each LEO satellite beam; Communication capacity requirements of satellite terminals under each LEO satellite beam; Capacity of each LEO satellite beam;

[0086] The ground cellular network information comprises at least one of:

[0087] a throughput of the ground cellular network; a SINR of the ground terminal under each ground cell in each time slot.

[0088] In an optional embodiment of the present application, the SINR of the satellite terminal under each satellite beam in each time slot in the low-orbit satellite network information in the first time slot period is obtained by:

[0089] The ephemeris information of the low-orbit satellite and the position information of the ground cellular base station (ground base station) are obtained, and the coordinates of the low-orbit satellite, the ground cellular base station and the user (including the satellite terminal and the ground terminal) in the Earth-Centered Earth-Fixed coordinate system are calculated according to the ephemeris information of the low-orbit satellite and the position information of the ground cellular base station, and the target distance d between the corresponding low-orbit satellite and the ground cellular base station and the antenna off-axis angle θ of the low-orbit satellite are calculated.

[0090] It should be noted that in the low-orbit satellite and cellular network dynamic spectrum sharing device facing the hopping beam, the interference type can be divided into intra-component interference (intra-system interference) and inter-component interference (inter-system interference). For inter-system interference, when the low-orbit satellite network and the ground cellular network share the spectrum, although the inter-system interference can be eliminated by spectrum allocation, the sidelobes of adjacent beams will cause co-frequency interference to the cellular network. By reasonably designing the hopping beam hopping pattern, a part of the interference can be eliminated. In order to protect the fairness between users, in any period, the hopping beam ensures that each beam with business demand works at least once in a time slot. For intra-system interference, when the low-orbit satellite network and the ground cellular network share the spectrum, although the inter-system interference of the same beam can be eliminated by spectrum allocation, the sidelobes of adjacent beams will still cause co-frequency interference to the cellular network. By reasonably designing the hopping beam pattern, a part of the interference can be eliminated. However, in order to ensure the fairness between low-orbit satellite terminals, in any time window, each beam with business demand is served at least once in a time slot, so this part of the inter-system co-frequency interference cannot be avoided.

[0091] Therefore, in the optional embodiment, the antenna gain of the second beam on the first beam is obtained according to the target distance, the antenna off-axis angle, the transmission power of the low-orbit satellite allocated to the first beam, the antenna gain received by the satellite terminal, the useful signal power received by the satellite terminal and the inter-beam interference signal power, wherein the first beam is any beam in the low-orbit satellite beam, and the second beam is a beam in the low-orbit satellite beam except the first beam. Specifically, the useful signal power P r p and the inter-beam interference signal power may be calculated by the following formulas, respectively:

[0092]

[0093]

[0094] In the above formula, P t p denotes the transmit power of the satellite to beam B p (the first beam), G r denotes the receive antenna gain of the satellite terminal, G max denotes the maximum gain of the satellite antenna, G b,p denotes the antenna gain of beam B b (the second beam) on beam B p (the first beam), γ denotes the link loss factor, B denotes the number of LEO satellite beams, g b,p denotes the normalized interference coefficient matrix, λ denotes the wavelength of the carrier. Among them, the receive antenna gain G r of the satellite terminal and the maximum gain G max of the satellite antenna are determined according to the antenna off-axis angle θ, and the specific process is as follows.

[0095] Specifically, the directional angle model of the satellite cell can be represented according to the satellite antenna model recommended in the ITU-R S.672-4 recommendation, as follows:

[0096]

[0097] In the formula, G r (θ) is the gain of the antenna off-axis angle θ, with the unit of dBi, G m is the maximum main lobe gain, θ1 is the angle when the third equation is equal to 0dBi, L s is the gain relative to the peak gain inner side lobe, θ0 is the half beam angle (°) of the 3dB beam width, and a and b respectively represent the antenna gain threshold coefficients.

[0098] According to the antenna gain of the second beam on the first beam, the average gain of the satellite terminal under the second beam is obtained;

[0099] According to the average gain of the satellite terminal and the interference factor of the second beam on the first ground cell, the SINR of the satellite terminal in each time slot under the second beam is obtained, that is, the specific formula of the SINR γ b of the satellite terminal n under beam B b,n,j in time slot j is as follows:

[0100]

[0101] Among them, Q represents the number of cells under beam i, P b,n,jdenotes the low earth orbit satellite beam B corresponding to satellite terminal n in time slot j b denotes the transmit power of the second beam b,n,j denotes the channel parameter of satellite terminal n receiving signals from the satellite q,n,j and h q,n,j denotes the transmit power and channel parameter of satellite terminal n receiving interference signals from the ground cellular cell q (first ground cell) in time slot j b,n,j denotes the bandwidth of satellite terminal n. Γ(h p,b ) denotes the inter-beam interference factor related to the inter-beam interference coefficient, Γ b,q denotes the interference factor of beam B b in the ground cellular cell q, whose value ranges from 0 to 1, and is related to the size of the overlap of the visibility, the frequency and the bandwidth of the beam.

[0102] Further, in the case that the first time slot period is the first period, Γ b,q is a preset value, i.e. a preset interference factor, and in the case that the first time slot period is not the first period, Γ b,q is determined according to the serving beam in each beam cluster in at least one beam cluster in the second time slot period and the serving time slot in the second time slot period corresponding to the serving beam, i.e. Γ b,q is determined according to the matrix T corresponding to the second time slot period, i.e. after the matrix T is determined, it can be determined which beam is lit at each time slot point and the interference factor of the corresponding time slot.

[0103] The inter-beam interference factor Γ(h p,b ) is determined according to the average satellite terminal gain of the second beam, which can be expressed as: Γ(h p,b )=Γ b,q G max g b,p .

[0104] Further, the average satellite terminal gain of the second beam is obtained according to the antenna gain of the second beam on the first beam, including:

[0105] The interference coefficient between the second beam and the first beam is obtained according to the antenna gain of the second beam on the first beam and the maximum gain of the satellite antenna, specifically, the antenna gain of the second beam on the first beam is normalized, and the inter-beam interference coefficient matrix G is introduced, which can measure the interference size between the beams serving any two beams in the system, and the inter-beam interference coefficient matrix G is as follows:

[0106]

[0107] wherein, G maxThis indicates the maximum gain of the satellite antenna, which is determined based on the antenna's off-axis angle.

[0108] For any matrix T, in the same time slot T i,j =1 corresponds to beam B b B p Interference coefficient g between b,p All of these can be found in matrix G. Its value depends on the frequency reuse between beams and the spatial isolation of matrix T. Since interference from users within the beam is ignored, g... b,b =0, g b,b Indicates beam B b The internal interference coefficient, if beam B b and beam B p Using different sub-bands, then g b,p =0, g p,b =0, g b,p Indicates beam B b and beam B p Interference coefficient between them, g p,b Indicates beam B p and beam B b Interference coefficient between them.

[0109] Based on the maximum gain and the interference coefficient, the average gain of the satellite terminal under the second beam is obtained. Specifically, this is achieved by using beam B. p Several points are randomly generated to represent the satellite terminal, and beam B is calculated. b The antenna gain in each satellite terminal direction, and the average gain of all satellite terminals, is G. max g b,p .

[0110] It should be noted that the schematic diagram of the LEO and terrestrial spectrum sharing network architecture is as follows: Figure 4 As shown, the ground base station and LEO satellite share the same frequency band to provide services to users in the service area. The LEO satellite gateway station and the ground base station are connected through high-speed lossless optical fiber to upload ephemeris, frequency configuration schemes and antenna radiation patterns, as well as the current channel status.

[0111] LEO satellites employ multi-beam antennas, assuming their corresponding satellite terminal antennas continuously track the satellite, meaning the elevation angle of the satellite terminal antennas dynamically changes. In this network architecture, ground base stations and LEO satellites establish fiber optic connections for spectrum sharing and information exchange. Using ephemeris and frequency configuration schemes, the timing and location of co-channel interference can be predicted, allowing for appropriate measures to mitigate the interference. After establishing a spectrum-sharing network between the two systems, the LEO satellite system can reduce co-channel interference by employing time-slot spectrum sharing technology.

[0112] When the LEO adopts the hop-beam payload, because the LEO system activates different beams at different time slots, for the ground user, at time slot j, the service beam corresponding to the activated beam produces interference to the ground user. In an optional embodiment of the present application, the SINR of the ground terminal under each ground cell in the ground cellular network information in the first time slot period is obtained, including:

[0113] According to the interference factor of the third beam to the second ground cell, the SINR of the ground terminal under each ground cell in each time slot is obtained, that is, the SINR of the ground terminal u under the ground cell q (the second ground cell) at time slot j is γ q,u,j The specific calculation formula is as follows:

[0114]

[0115] Wherein, P q,u,j represents the transmission power of the base station corresponding to the ground terminal u under the ground cell q at time slot j, h q,u,j represents the channel parameter of the ground terminal u receiving the signal from the base station. P b,j represents the transmission power of the beam b (the third beam) at time slot j, h b,u,j represents the channel parameter of the ground terminal u receiving the interference signal from the beam b at time slot j, K represents the Boltzmann constant, T n represents the receiving end noise temperature, B q,u,j represents the available bandwidth of the ground terminal u, and B represents the number of low-orbit satellite beams. Γ b,q represents the interference factor of the beam b to the ground cell q, which is valued between 0 and 1, and is related to the visibility, the frequency and the coincidence size of the beam.

[0116] Wherein, the third beam is any beam in the low-orbit satellite beam; the second ground cell is any ground cell; in the case that the first time slot period is the first period, Γ b,q is a preset value, that is, a preset interference factor, and in the case that the first time slot period is not the first period, Γ b,q is determined according to the service beam in each beam cluster in at least one beam cluster in the second time slot period and the service time slot corresponding to the service beam in the second time slot period, that is, Γ b,q is determined according to the matrix T corresponding to the second time slot period.

[0117] In an optional embodiment of the present application, the throughput of the low-orbit satellite network in the low-orbit satellite network information in the first time slot period is obtained, including:

[0118] The throughput of the low-Earth orbit satellite network is obtained based on the SINR of the satellite terminal under each low-Earth orbit satellite beam in each time slot, using the following formula:

[0119]

[0120] Among them, R LEO γ represents the throughput of low-Earth orbit satellite networks. b,n,j N represents the SINR of the satellite terminal in each time slot under each low-Earth orbit satellite beam. b B represents the number of beams illuminated. b,n,j Let B represent the bandwidth of satellite terminal n, B represent the number of low-orbit satellites, and J represent the number of time slots in the first time slot period.

[0121] In an optional embodiment of the present invention, obtaining the throughput of the terrestrial cellular network in the terrestrial cellular network information within the first time slot period includes:

[0122] The throughput of the terrestrial cellular network is obtained based on the SINR of the ground terminal in each time slot under each ground cell, and the specific formula is as follows:

[0123]

[0124] Among them, R T γ represents the throughput of the terrestrial cellular network, Q is the number of cells under beam i, and γ q,u,j B represents the SINR of the ground terminal in each time slot under each ground cell. q,u,j U represents the available bandwidth of the ground terminal u. q This indicates the number of ground cells under the low-orbit satellite beam, and J indicates the number of time slots in the first time slot period.

[0125] It should be noted that within the framework of satellite component integration with the ground, ground services can be enhanced. A schematic diagram illustrating application scenarios for satellite components that enhance ground services is shown below. Figure 5 As shown, Figure 5 In China, satellite components are used in various applications including broadband aviation, data backhaul and service distribution, mobile communication, broadband mobile communication services, broadcasting, satellite tracking, remote area coverage, industrial internet, maritime communication, and emergency networking. Ground base stations can reuse satellite network frequencies in various ways, such as traditional frequency reuse schemes... Figure 6 As shown. The basic principle of this scheme is that, apart from the frequency used by the current satellite beam, the base station can use all other frequencies within the entire system frequency band.

[0126] The time of periodic operation of the satellite is divided into several time windows. Since the satellite, ground cellular network traffic trends are not highly dynamic, the periodic beam hopping pattern can be optimized within the time window. A time window has a fixed number of time slots J in a single period. In each time slot, the beams in operation occupy the entire power resources of the satellite. Assume that there are Y beams under a single satellite coverage, and Z beams have communication needs in a certain period. To ensure the basic communication needs of each beam, Z beams work at least once in a time slot in a period. Based on the concept of beam cluster, the beam interference is reduced by spatial isolation, that is, S beams are assumed to be a beam cluster, and at most one beam in each cluster is turned on in the same time slot.

[0127] Therefore, according to the low-orbit satellite network information and the ground cellular network information, the generated constraint target includes the maximum throughput of the low-orbit satellite network and the ground cellular network;

[0128] The constraint condition includes at least one of the following:

[0129] The SINR of the ground terminal under each ground cell in each time slot is greater than a first preset value;

[0130] The SINR of the satellite terminal under each low-orbit satellite beam in each time slot is greater than a second preset value;

[0131] The communication demand capacity of the satellite terminal under each low-orbit satellite beam is less than the capacity of the corresponding low-orbit satellite beam;

[0132] The number of service beams is greater than or equal to the number of beam clusters;

[0133] The number of service beams in a time slot is less than or equal to 1.

[0134] Specifically, the goal of using the beam hopping technology in the low-orbit satellite network and ground cellular network spectrum sharing device is to maximize the capacity of the overall satellite and cellular network fusion networking, which can be summarized as the following optimization problem:

[0135] max R LEO +R T

[0136] s.t.γ b,n,j ≥γ sth

[0137] γ q,u,j ≥γ tth

[0138]

[0139]

[0140] T 1,j +T 2,j +...T S,j ≤1 (j=1,...,J)

[0141] T S+1,j +T S+2,j +...T 2S,j ≤1 (j=1,...,J) ...

[0143] T Y-S+1,j +T Y-S+2,j +...T Y,j ≤1 (j=1,...,J)

[0144] Among them, R T R represents the throughput of terrestrial cellular networks. LEO γ represents the throughput of low-Earth orbit satellite networks. q,u,j γ represents the SINR of the ground terminal in each time slot under each ground cell. b,n,j γ represents the SINR of the satellite terminal in each time slot under each low-Earth orbit satellite beam. sth This represents the interference threshold for the satellite, i.e., the second preset value, γ. tth S represents the interference threshold of the ground terminal, i.e., the first preset value. B represents the number of serving beams, and B is greater than or equal to S.

[0145] This indicates that the communication capacity requirement of a satellite terminal under each low-Earth orbit (LEO) satellite beam is less than the capacity of the corresponding LEO satellite beam. The specific explanation is as follows:

[0146] Assume that the arrival of users in the satellite-to-ground converged network follows a birth-death process of M / M / m(m), where M represents the user arrival time interval distribution, M represents the service time, m represents the number of users that can be accommodated, and m represents the service arrival process of (m). Here, μ represents the inflow traffic intensity, and λ represents the user arrival rate. The average waiting time for user n can be expressed as:

[0147]

[0148] The delay constraint factor can be expressed as:

[0149]

[0150] Define service strength as The delay constraint factor can be expressed as:

[0151]

[0152] With beam B b Let's take the nth satellite terminal as an example to illustrate the variables. At the satellite terminal level, assume that at a certain moment, beam B...b The service demand generated by the nth satellite terminal is t. n The time delay constraint factor is d n The capacity allocated to the nth satellite terminal using the allocation algorithm is c. n At the beam level, at the same time, beam B... b The total business demand within the coverage area is T b The average delay constraint factor is D. b The satellite was assigned to beam B. b The capacity is represented by C. b The relationship between the variables at these two levels can be represented by the following formula.

[0153]

[0154]

[0155]

[0156] Where, N b For beam B b The total number of satellite terminals.

[0157] In this device, the average delay constraint factor of the beam can be converted into the minimum service requirement for each beam. Therefore, the communication requirement with a fixed delay is the lower limit of the actual allocated capacity, as shown in the following formula:

[0158]

[0159] Among them, e b Indicates spot beam B b The packet error rate of the transmission channel, where 'a' represents a function, generally:

[0160] (1-e b )α(D b )>1

[0161] In an optional embodiment of the present invention, after determining the matrix T, the method further includes: frequency coordination between the lit wave position and the ground to reduce inter-system interference, that is, when the ground terminal transmits services at the first frequency corresponding to the service beam, the services of the ground terminal are adjusted to be transmitted at the second frequency.

[0162] The implementation process of the dynamic resource scheduling algorithm of the satellite-to-ground spectrum sharing method provided in this embodiment of the invention is described in detail below:

[0163] In the device, the low-orbit satellite network realizes spectrum sharing optimization with the ground cellular network based on the hop beam technology, which is actually the process of selecting the optimal beam and the corresponding service time slot matrix T. Through continuous iteration and optimization of the selection of the matrix T, the objective function in the optimization problem can be solved.

[0164] The input parameters include: cellular terminal radio frequency information, cellular base station radio frequency and location information, cellular and satellite terminal service demand, satellite terminal GNSS information, satellite radio frequency information, ephemeris information and beam coverage geographic location information, satellite and ground terminal interference threshold sth And tth , time slot number J, start time t1, end time t2, iteration step Δt.

[0165] The coordinates of the low-orbit satellite, base station and terminal in the earth-centered earth-fixed coordinate system are calculated from the low-orbit satellite ephemeris information and the cellular base station location information, and the corresponding distance d and antenna off-axis angle θ are calculated.

[0166] The running time is set as a single period under a single time window, which contains J time slots, and the satellite beam is divided into S clusters.

[0167] According to the distance d and the antenna off-axis angle θ, the signal-to-interference-and-noise ratio γ b,n,j And q,u,j of the satellite terminal and the ground terminal under the interference of different time slots and beams under the low-orbit satellite hop beam service are calculated.

[0168] The beam with the maximum overall capacity of the low-orbit satellite and the ground cellular user is found in each cluster in the period, and the beam is served in the appropriate time slot.

[0169] The frequency is coordinated between the on-beam and the ground to reduce the inter-system interference.

[0170] The SINR of the related users in the ephemeris update time window is updated.

[0171] The above steps are repeated until all time slots are allocated, and the algorithm ends.

[0172] Output parameters: the matrix T of the beam and the corresponding service time slot in the low-orbit satellite hop beam system corresponding to a single period, the SINR, rate of the ground terminal and the satellite terminal, and the capacity of the two systems.

[0173] To analyze the effectiveness of the method provided by the embodiment of the application, the following three algorithms are compared:

[0174] (1) Beam Hopping Dynamic spectrum sharing (BH-DSS), i.e., the satellite-ground spectrum sharing method provided by the embodiment of the application, is a dynamic resource scheduling algorithm based on beam hopping pattern design considering mixed co-channel interference;

[0175] (2) Bandwidth convex optimization allocation algorithm (BCO): this algorithm considers mixed co-channel interference factors and allocates bandwidth resources among beams according to demand;

[0176] (3) Uniform bandwidth allocation spectrum sharing algorithm (UBSS): this algorithm considers mixed co-channel interference factors and allocates total system resources to each beam.

[0177] Figure 7 is one of the diagrams provided by the embodiment of the application showing the influence of inter-beam interference on system performance, Figure 8 represents another diagram provided by the embodiment of the application showing the influence of inter-beam interference on system performance, wherein Maximum traffic requirment (Maximum TR) represents maximum capacity demand, and Minimum traffic requirment (Minimum TR) represents minimum capacity demand, which is Figure 7 and Figure 8 It can be seen that, wherein Considering interference factor represents considering the influence factor, and Ignoring interference factor represents not considering the influence factor, the BCO and UBSS algorithms are affected by mixed co-channel interference, and the system capacity and resource utilization of the satellite-ground spectrum sharing network system significantly decrease, while the BH-DSS algorithm provided by the embodiment of the application effectively avoids inter-beam interference through beam hopping pattern design, and the influence of mixed co-channel interference on system performance is small, and the system capacity and resource utilization do not decrease. The system capacity and resource utilization of the BCO algorithm affected by mixed co-channel interference decrease by 4.0% and 19.0%, respectively, and the system capacity and resource utilization of the UBSS algorithm affected by mixed co-channel interference decrease by 4.4% and 10.0%, respectively.

[0178] Among the three algorithms, whether considering mixed co-channel interference factors, BH-DSS, BCO and UBSS decrease in system capacity performance, resource utilization, etc. in turn. This is because BH-DSS and BCO can allocate bandwidth to different beams more reasonably based on the service demand of different wave positions, so as to reduce the gap between capacity and demand, thereby improving the capacity and resource utilization of the system. The BH-DSS algorithm avoids mixed co-channel interference to some extent through the design of the beam hopping pattern, and compared with the BCO algorithm, increases the resource allocation in the time domain dimension, so the performance is optimal.

[0179] Figure 9 The capacity allocation of point beams with different beam activity under heavy load network, that is, the capacity demand of wave positions increases in turn with the wave position number in the heavy load scenario, Figure 10 The capacity allocation of point beams with different beam activity under light load network, that is, only eight of the ten wave positions have capacity demand in the light load scenario. Figure 9 And Figure 10 The present application provides the change of the system total capacity corresponding to the three algorithms with different wave positions in a unit period. Among them, Maximum traffic requirement (Maximum TR) represents the maximum capacity demand, and Minimum traffic requirement (Minimum TR) represents the minimum capacity demand. Under different network load scenarios, the system capacity corresponding to the BH-DSS (BH-DSS-I) and BCO (BCO-I) algorithms changes with the capacity demand of different wave positions. This is because these two algorithms fully consider the capacity demand of different wave positions and flexibly allocate network resources according to demand; while the UBSS (UBSS-I) algorithm allocates more capacity to some wave positions than the maximum capacity demand of the wave position, and cannot meet the demand of some wave positions with high service demand, so there is resource waste and cannot guarantee the fairness between wave positions. Under the condition of considering mixed co-channel interference, the BH-DSS algorithm adopts a clustering-based beam hopping scheme, which effectively avoids the interference between beams, and the system capacity is obviously improved compared with the BCO algorithm. Under the condition of not considering mixed co-channel interference, the capacity allocation of the BH-DSS algorithm considers the three dimensions of spectrum, time slot and space, and can more efficiently schedule resources.

[0180] Under heavy load network, the BH-DSS algorithm avoids mixed co-channel interference to a certain extent through the design of the hop beam pattern, and compared with the BCO algorithm, the time domain dimension resource allocation is increased, the system capacity is improved by 21.7% under the consideration of mixed co-channel interference, and the system capacity is improved by 16.8% under the neglect of mixed co-channel interference. Compared with the UBSS algorithm, the system capacity is improved by 30.9% under the consideration of mixed co-channel interference, and the system capacity is improved by 25.0% under the neglect of mixed co-channel interference, so the BH-DSS performance is optimal.

[0181] Figure 11 The difference between the capacity of the point beam under different beam activity and the square sum of the traffic duration under heavy load network, that is, the capacity requirement of the beam position increases with the beam position number in the heavy load scenario, Figure 12 The difference between the capacity of the point beam under different beam activity and the square sum of the traffic duration under heavy load network, that is, the capacity requirement of the beam position increases with the beam position number in the heavy load scenario,

[0182] Because the BH-DSS algorithm adopts the hop beam technology, it can effectively avoid the interference between beams, and can obtain higher resource utilization rate under the consideration of mixed co-channel interference; and can perform more flexible time slot scheduling based on the hop beam technology, compared with the BCO algorithm, the difference between the two can be minimized, and the traffic demand of each beam can be met as much as possible.

[0183] Under heavy load network, the BH-DSS algorithm avoids mixed co-channel interference to a certain extent through the design of the hop beam pattern, and compared with the BCO algorithm, the time domain dimension resource allocation is increased, the system capacity is improved by 21.7% under the consideration of mixed co-channel interference, and the system capacity is improved by 16.8% under the neglect of mixed co-channel interference. Compared with the UBSS algorithm, the system capacity is improved by 30.9% under the consideration of mixed co-channel interference, and the system capacity is improved by 25.0% under the neglect of mixed co-channel interference, so the BH-DSS performance is optimal.

[0184] The embodiment of the application adds the time service and the geographic position information into the satellite wireless channel simulation system, uses the Beidou simulator to simulate the time service and the function of obtaining the position information of the satellite positioning system. In this way, the satellite and the base station with high dynamicity can be simultaneously simulated, good coordination effect is obtained, and the actual situation of the satellite communication system is more accurately reflected. The geographic information system is added into the satellite wireless channel simulation system, and the geographic information system (GIS) is added. Based on the geographic information system, in combination with the motion trajectory of the active base station, the spatial characteristics on the motion trajectory of the active base station can be simulated, and the physical conditions of the channel in various space-time states are closer. The electromagnetic characteristics and the space-time characteristics of the satellite wireless channel are cooperatively controlled by using the starting control module to uniformly trigger the channel simulation and the space-time simulation. The starting control module is introduced, the motion moments of the satellite and the base station are aligned, and the physical composition of the channel and the relative relationship between the satellite and the base station are accurately simulated and simulated.

[0185] In the embodiment of the application, a satellite-ground spectrum sharing method based on a hopping beam is provided. The method considers deep information interaction between a satellite and a ground cellular network, utilizes flexibility of the hopping beam in time domain, frequency domain and space domain, applies the hopping beam to a satellite-ground spectrum sharing device, and realizes maximization of system capacity of a joint system of the satellite and the ground cellular network by reasonably designing a hopping beam pattern.

[0186] A satellite-ground spectrum sharing device based on a hopping beam is provided. In a satellite-ground overlapping area, satellite and ground cellular communication operators perform centralized resource allocation and beam management based on information of the two networks by adding a unified resource allocation unit, so as to reduce influence of satellite-ground same-frequency interference and maximize system benefits.

[0187] In the process of designing the hopping beam pattern, a wave position is clustered, and at most one wave position in each cluster in a same time slot is lighted. This method can reduce inter-beam interference by spatial isolation.

[0188] A dynamic spectrum sharing method based on a hopping beam is provided. The method takes into account fairness between beams, delay limitation and mixed co-channel interference, and overcomes a serious same-frequency interference problem, and effectively improves overall capacity of the satellite and the ground network.

[0189] With the development of low earth orbit satellite constellation, the satellite hopping beam technology with superior flexibility will be widely used in low earth orbit satellites, and the hopping beam has multiple working modes, and the beam can be hopped according to a hopping beam pattern in all cells, or multiple cells can be combined into a cluster, and at least one beam in each cluster is lit. The application applies the hopping beam to the LEO satellite and the ground spectrum sharing scene, and provides a LEO satellite and ground spectrum sharing device. When the LEO satellite obtains the frequency occupation of the ground, the hopping beam pattern can be reasonably designed, the beam coverage and the beam transmission power parameters are optimized, so that the interference between the LEO satellite and the ground is minimized, and the capacity of the system is maximized.

[0190] The satellite-ground spectrum dynamic sharing based on the hopping beam is an important research direction of the future mobile direct connection satellite scene, and the application can greatly improve the resource utilization and alleviate the problem of tight low-frequency resources. The trend of integration of space and ground will promote the satellite and ground cellular network to be no longer completely independent, and the two can be deeply integrated at the networking level. Based on the deep interaction of useful information of the two networks, the satellite-ground spectrum dynamic sharing scheme will obtain better performance.

[0191] As shown in Figure 13 The application embodiment further provides a satellite-ground spectrum sharing device, which comprises:

[0192] A first acquisition module 1301 is configured to acquire low earth orbit satellite network information and ground cellular network information in a first time slot period, and the first time slot period comprises at least one time slot;

[0193] A first processing module 1302 is configured to obtain a constraint target and a constraint condition of satellite-ground spectrum sharing according to the low earth orbit satellite network information and the ground cellular network information;

[0194] A second processing module 1303 is configured to obtain a service beam in each beam cluster in a plurality of beam clusters in the first time slot period and a service time slot corresponding to the service beam in the first time slot period according to the constraint target and the constraint condition;

[0195] Each beam cluster comprises at least one low earth orbit satellite beam, and the service beam is at least one beam in the at least one low earth orbit satellite beam.

[0196] Optionally, the low earth orbit satellite network information comprises at least one of the following:

[0197] The throughput of the low earth orbit satellite network; the signal-to-interference ratio (SINR) of the satellite terminal in each time slot under each low earth orbit satellite beam; the communication demand capacity of the satellite terminal under each low earth orbit satellite beam; and the capacity of each low earth orbit satellite beam.

[0198] The ground cellular network information comprises at least one of:

[0199] The constraint target comprises at least one of:

[0200] The constraint target comprises at least one of:

[0201] The constraint condition comprises at least one of:

[0202] The SINR of the satellite terminal under each low-orbit satellite beam in each time slot is greater than a second preset value;

[0203] The SINR of the satellite terminal under each low-orbit satellite beam in each time slot is greater than a second preset value;

[0204] The communication demand capacity of the satellite terminal under each low-orbit satellite beam is less than the capacity of the corresponding low-orbit satellite beam;

[0205] The number of the serving beams is greater than or equal to the number of the beam clusters;

[0206] The number of the serving beams in one time slot is less than or equal to 1.

[0207] Optionally, the first obtaining module 1301 comprises:

[0208] The first processing unit is configured to obtain a target distance between the low-orbit satellite and the ground cellular base station and an antenna off-axis angle of the low-orbit satellite according to ephemeris information of the low-orbit satellite and position information of the ground cellular base station;

[0209] The second processing unit is configured to obtain an antenna gain of a second beam on a first beam according to the target distance, the antenna off-axis angle, a transmission power of the first beam allocated by the low-orbit satellite, a useful signal power received by the satellite terminal and an inter-beam interference signal power;

[0210] The third processing unit is configured to obtain a satellite terminal gain average value under the second beam according to the antenna gain of the second beam on the first beam;

[0211] The fourth processing unit is configured to obtain a SINR of the satellite terminal under the second beam in each time slot according to the satellite terminal gain average value and an interference factor of the second beam in the first ground cell;

[0212] The first beam is any beam in the low-orbit satellite beam, and the second beam is any beam in the low-orbit satellite beam except the first beam; the first ground cell is any ground cell; in the case that the first time slot period is the first time slot period, the interference factor of the second beam in the first ground cell is a preset interference factor, and in the case that the first time slot period is not the first time slot period, the interference factor of the second beam in the first ground cell is determined according to a service beam in each beam cluster in at least one beam cluster in the second time slot period and a service time slot corresponding to the service beam in the second time slot period, and the second time slot period is a time slot period before the first time slot period.

[0213] Optionally, the third processing unit is specifically configured to:

[0214] According to the antenna gain of the second beam on the first beam and the maximum gain of the satellite antenna, an interference coefficient between the second beam and the first beam is obtained; the maximum gain of the satellite antenna is determined according to the off-axis angle of the antenna;

[0215] According to the maximum gain and the interference coefficient, a satellite terminal gain average value under the second beam is obtained.

[0216] Optionally, the first acquisition module 1301 comprises:

[0217] The fifth processing unit is configured to obtain the SINR of the ground terminal in each time slot under each ground cell according to the interference factor of the third beam in the second ground cell.

[0218] The third beam is any beam in the low-orbit satellite beam; the second ground cell is any ground cell; in the case that the first time slot period is the first time slot period, the interference factor of the third beam in the second ground cell is a preset interference factor, and in the case that the first time slot period is not the first time slot period, the interference factor of the third beam in the second ground cell is determined according to a service beam in each beam cluster in at least one beam cluster in the second time slot period and a service time slot corresponding to the service beam in the first time slot period.

[0219] Optionally, the first acquisition module 1301 comprises:

[0220] The sixth processing unit is configured to obtain the throughput of the low-orbit satellite network according to the SINR of the satellite terminal in each time slot under each low-orbit satellite beam.

[0221] Optionally, the first acquisition module 1301 comprises:

[0222] A seventh processing unit is configured to obtain the throughput of the terrestrial cellular network according to the SINR of the ground terminal under each ground cell in each time slot.

[0223] Optionally, the apparatus further comprises:

[0224] A third processing module is configured to, in a case where the ground terminal transmits services at a first frequency corresponding to the service beam, adjust the services of the ground terminal to be transmitted at a second frequency.

[0225] It should be noted that the satellite-to-ground spectrum sharing apparatus provided by the embodiments of the present application is an apparatus capable of performing the above-mentioned satellite-to-ground spectrum sharing method, and all the embodiments of the above-mentioned satellite-to-ground spectrum sharing method are applicable to the apparatus and can achieve the same or similar technical effects.

[0226] As shown in Figure 14 The embodiments of the present application further provide a satellite-to-ground spectrum sharing device, which comprises a processor 1401 and a memory 1403 connected with the processor 1401 through a bus interface 1402, wherein the memory 1403 is used to store programs and data used by the processor 1401 during execution, and the processor 1401 invokes and executes the programs and data stored in the memory 1403.

[0227] The transceiver 1404 is connected with the bus interface 1402 and is used to receive and send data under the control of the processor 1401, and specifically, the processor 1401 is used to read the programs in the memory 1403 and execute the following processes:

[0228] Obtain low-orbit satellite network information and ground cellular network information in a first time slot period, wherein the first time slot period comprises at least one time slot;

[0229] According to the low-orbit satellite network information and the ground cellular network information, obtain a constraint target and a constraint condition of satellite-to-ground spectrum sharing;

[0230] According to the constraint target and the constraint condition, obtain a service beam in each beam cluster of a plurality of beam clusters and a service time slot corresponding to the service beam in the first time slot period;

[0231] Each of the beam clusters comprises at least one low-orbit satellite beam, and the service beam is at least one of the at least one low-orbit satellite beam.

[0232] Optionally, the low-orbit satellite network information comprises at least one of the following:

[0233] a throughput of the low earth orbit satellite network; a signal to interference and noise ratio (SINR) of a satellite terminal in each time slot under each low earth orbit satellite beam; a communication demand capacity of the satellite terminal under each low earth orbit satellite beam; a capacity of each low earth orbit satellite beam;

[0234] The ground cellular network information comprises at least one of:

[0235] a throughput of the ground cellular network; a SINR of a ground terminal in each time slot under each ground cell.

[0236] Optionally, the constraint target comprises a maximum of the throughput of the low earth orbit satellite network and the throughput of the ground cellular network.

[0237] The constraint condition comprises at least one of:

[0238] a SINR of a ground terminal in each time slot under each ground cell is greater than a first preset value;

[0239] a SINR of a satellite terminal in each time slot under each low earth orbit satellite beam is greater than a second preset value;

[0240] a communication demand capacity of the satellite terminal under each low earth orbit satellite beam is less than a capacity of a corresponding low earth orbit satellite beam.

[0241] The number of the serving beams is greater than or equal to the number of the beam clusters.

[0242] The number of the serving beams in one time slot is less than or equal to 1.

[0243] Optionally, the processor 1401 is specifically configured to:

[0244] obtain a target distance between the low earth orbit satellite and the ground cellular base station and an antenna off-axis angle of the low earth orbit satellite according to ephemeris information of the low earth orbit satellite and position information of the ground cellular base station;

[0245] obtain an antenna gain of a second beam on a first beam according to the target distance, the antenna off-axis angle, a transmission power of the first beam allocated by the low earth orbit satellite, a useful signal power received by a satellite terminal and an inter-beam interference signal power;

[0246] obtain a satellite terminal gain average value under the second beam according to the antenna gain of the second beam on the first beam;

[0247] obtain a SINR of a satellite terminal in each time slot under the second beam according to the satellite terminal gain average value and an interference factor of the second beam in the first ground cell;

[0248] The first beam is any beam in the low-orbit satellite beam, and the second beam is any beam in the low-orbit satellite beam except the first beam; the first ground cell is any ground cell; in the case that the first time slot period is the first time slot period, the interference factor of the second beam in the first ground cell is a preset interference factor, and in the case that the first time slot period is not the first time slot period, the interference factor of the second beam in the first ground cell is determined according to a service beam in each beam cluster in at least one beam cluster in the second time slot period and a service time slot corresponding to the service beam in the second time slot period, and the second time slot period is a time slot period before the first time slot period.

[0249] Optionally, the processor 1401 is specifically configured to:

[0250] According to the antenna gain of the second beam on the first beam and the maximum gain of the satellite antenna, an interference coefficient between the second beam and the first beam is obtained; the maximum gain of the satellite antenna is determined according to the off-axis angle of the antenna;

[0251] According to the maximum gain and the interference coefficient, a satellite terminal gain average value under the second beam is obtained.

[0252] Optionally, the processor 1401 is specifically configured to:

[0253] According to the interference factor of the third beam in the second ground cell, a SINR of a ground terminal in each time slot under each ground cell is obtained.

[0254] The third beam is any beam in the low-orbit satellite beam; the second ground cell is any ground cell; in the case that the first time slot period is the first time slot period, the interference factor of the third beam in the second ground cell is a preset interference factor, and in the case that the first time slot period is not the first time slot period, the interference factor of the third beam in the second ground cell is determined according to a service beam in each beam cluster in at least one beam cluster in the second time slot period and a service time slot corresponding to the service beam in the first time slot period.

[0255] Optionally, the processor 1401 is specifically configured to:

[0256] According to the SINR of a satellite terminal in each time slot under each low-orbit satellite beam, a throughput of the low-orbit satellite network is obtained.

[0257] Optionally, the processor 1401 is specifically configured to:

[0258] The throughput of the terrestrial cellular network is obtained according to the SINR of the ground terminal under each ground cell in each time slot.

[0259] Optionally, the processor 1401 is further configured to:

[0260] In a case where the ground terminal transmits service at a first frequency corresponding to the service beam, the service of the ground terminal is adjusted to be transmitted at a second frequency.

[0261] In the formula, the first frequency is a frequency corresponding to the service beam, and the second frequency is a frequency corresponding to the reference beam. Figure 14 In the formula, the bus architecture can include any number of interconnected buses and bridges, which link various circuits, including one or more processors represented by the processor 1401 and the memory represented by the memory 1403. The bus architecture can also link various other circuits, such as peripheral devices, voltage stabilizers, and power management circuits, which are well known in the art, and thus, are not further described herein. The bus interface provides the user interface 1405. The transceiver 1404 can be a plurality of elements, i.e., including a transmitter and a receiver, which provide units for communicating with various other devices on a transmission medium. The processor 1401 is responsible for managing the bus architecture and general processing, and the memory 1403 can store data used by the processor 1401 when performing operations.

[0262] In addition, the embodiments of the present application also provide a computer readable storage medium, which stores a computer program, wherein the program is executed by a processor to implement the steps in the method for satellite-terrestrial spectrum sharing in any one of the above embodiments.

[0263] In several embodiments provided in the present application, it should be understood that the disclosed method and device can be implemented by other manners. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0264] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can be physically included separately, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware, or in the form of hardware plus software functional units.

[0265] The integrated unit in the form of software function unit can be stored in a computer readable storage medium. The software function unit is stored in a storage medium, and includes a plurality of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform part of steps of the transceiving method according to the embodiments of the present application. The storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various storage medium capable of storing program codes.

[0266] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary people in the technical field, a number of improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of satellite-to-Earth spectrum sharing, the method comprising: The method comprises: obtaining low-orbit satellite network information and ground cellular network information in a first time slot period, the first time slot period comprising at least one time slot; wherein the low-orbit satellite network information comprises: a throughput of a low-orbit satellite network; a signal-to-interference-and-noise ratio (SINR) of a satellite terminal under each low-orbit satellite beam in each time slot; a communication demand capacity of a satellite terminal under each low-orbit satellite beam; a capacity of each low-orbit satellite beam; and the ground cellular network information comprises: a throughput of a ground cellular network; and a SINR of a ground terminal under each ground cell in each time slot; obtaining constraint targets and constraint conditions for satellite-ground spectrum sharing according to the low-orbit satellite network information and the ground cellular network information; wherein the constraint targets comprise: maximum throughputs of the low-orbit satellite network and the ground cellular network; and the constraint conditions comprise: the SINR of the ground terminal under each ground cell in each time slot is greater than a first preset value; the SINR of the satellite terminal under each low-orbit satellite beam in each time slot is greater than a second preset value; the communication demand capacity of the satellite terminal under each low-orbit satellite beam is less than the capacity of the corresponding low-orbit satellite beam; the number of serving beams is greater than or equal to the number of beam clusters; and the number of serving beams in one time slot is less than or equal to 1; obtaining serving beams in each beam cluster in a plurality of beam clusters in the first time slot period and serving time slots corresponding to the serving beams in the first time slot period according to the constraint targets and the constraint conditions; wherein each beam cluster comprises at least one low-orbit satellite beam, and the serving beam is at least one beam in the at least one low-orbit satellite beam.

2. The method of claim 1, wherein, Obtaining low-orbit satellite network information in a first time slot period comprises: obtaining a target distance between a low-orbit satellite and a ground cellular base station and an antenna off-axis angle of the low-orbit satellite according to ephemeris information of the low-orbit satellite and position information of the ground cellular base station; obtaining antenna gain of a second beam on a first beam according to the target distance, the antenna off-axis angle, transmit power of the first beam allocated by the low-orbit satellite, useful signal power received by a satellite terminal, and inter-beam interference signal power; obtaining a satellite terminal gain average value under the second beam according to the antenna gain of the second beam on the first beam; obtaining a SINR of a satellite terminal under the second beam in each time slot according to the satellite terminal gain average value and an interference factor of the second beam in a first ground cell; The first beam is any beam in the low-orbit satellite beam, and the second beam is any beam in the low-orbit satellite beam except the first beam; the first ground cell is any ground cell; in the case that the first time slot period is the first time slot period, the interference factor of the second beam in the first ground cell is a preset interference factor, and in the case that the first time slot period is not the first time slot period, the interference factor of the second beam in the first ground cell is determined according to a service beam in each beam cluster in at least one beam cluster in a second time slot period and a service time slot corresponding to the service beam in the second time slot period, and the second time slot period is a time slot period before the first time slot period.

3. The method of claim 2, wherein, The average satellite terminal gain of the second beam is obtained according to the antenna gain of the second beam on the first beam, including: The interference coefficient between the second beam and the first beam is obtained according to the antenna gain of the second beam on the first beam and the maximum gain of the satellite antenna; the maximum gain of the satellite antenna is determined according to the off-axis angle of the antenna; The average satellite terminal gain of the second beam is obtained according to the maximum gain and the interference coefficient.

4. The method of claim 1, wherein, The ground cellular network information in the first time slot period is obtained, including: The SINR of each ground terminal in each time slot under each second ground cell is obtained according to the interference factor of the third beam in the second ground cell; The third beam is any beam in the low-orbit satellite beam; the second ground cell is any ground cell; in the case that the first time slot period is the first time slot period, the interference factor of the third beam in the second ground cell is a preset interference factor, and in the case that the first time slot period is not the first time slot period, the interference factor of the third beam in the second ground cell is determined according to a service beam in each beam cluster in at least one beam cluster in a second time slot period and a service time slot corresponding to the service beam in the first time slot period.

5. The method of claim 1, wherein, The low-orbit satellite network information in the first time slot period is obtained, including: The throughput of the low-orbit satellite network is obtained according to the SINR of each satellite terminal in each time slot under each low-orbit satellite beam.

6. The method of claim 1, wherein, The ground cellular network information in the first time slot period is obtained, including: The throughput of the ground cellular network is obtained according to the SINR of each ground terminal in each time slot under each ground cell.

7. The method of claim 1, wherein, The method further includes: In the case that the ground terminal transmits services at a first frequency corresponding to the service beam, the services of the ground terminal are adjusted to a second frequency for transmission.

8. A satellite-to-ground spectrum sharing apparatus, comprising: Including: The first acquisition module is configured to acquire low-orbit satellite network information and ground cellular network information in a first time slot period, the first time slot period comprising at least one time slot; wherein the low-orbit satellite network information comprises: a throughput of a low-orbit satellite network; a signal-to-interference-and-noise ratio (SINR) of a satellite terminal under each low-orbit satellite beam in each time slot; a communication demand capacity of the satellite terminal under each low-orbit satellite beam; a capacity of each low-orbit satellite beam; and the ground cellular network information comprises: a throughput of a ground cellular network; and a SINR of a ground terminal under each ground cell in each time slot. The first processing module is configured to obtain a constraint target and a constraint condition of satellite-ground spectrum sharing according to the low-orbit satellite network information and the ground cellular network information; wherein the constraint target comprises: a maximum of the throughput of the low-orbit satellite network and the throughput of the ground cellular network; and the constraint condition comprises: the SINR of the ground terminal under each ground cell in each time slot is greater than a first preset value; the SINR of the satellite terminal under each low-orbit satellite beam in each time slot is greater than a second preset value; the communication demand capacity of the satellite terminal under each low-orbit satellite beam is less than the capacity of the corresponding low-orbit satellite beam; a number of serving beams is greater than or equal to a number of beam clusters; and a number of serving beams in one time slot is less than or equal to 1. The second processing module is configured to obtain, according to the constraint target and the constraint condition, a serving beam in each beam cluster in a plurality of beam clusters in the first time slot period and a serving time slot corresponding to the serving beam in the first time slot period; wherein each beam cluster comprises at least one low-orbit satellite beam, and the serving beam is at least one beam in the at least one low-orbit satellite beam.

9. A satellite-to-ground spectrum sharing device, comprising: The processor, the memory, and a program stored in the memory and executable on the processor, the program being executed by the processor to implement the satellite-ground spectrum sharing method according to any one of claims 1 to 7. The readable storage medium stores a program, the program being executed by a processor to implement the steps in the satellite-ground spectrum sharing method according to any one of claims 1 to 7.

10. A readable storage medium, characterized by, ​

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