Signal-carrier communication method based on satellite-ground backhaul link, and target satellite and target gateway

Abstract

Provided in the embodiments of the present disclosure are a signal-carrier communication method based on a satellite-ground backhaul link, and a target satellite and a target gateway. The method comprises: on the basis of an inter-satellite link, acquiring information of an adjacent satellite of a target satellite; on the basis of an ephemeris and network configuration information, acquiring a ground gateway which can establish a communication link with the target satellite within the current time window, and generating a gateway candidate set; on the basis of the information of the adjacent satellite and the gateway candidate set, determining a target gateway which is about to establish a link with the target satellite; calculating a delay of a link to be established between the target satellite and the target gateway, and on the basis of the delay of the link to be established between the target satellite and the target gateway, a communication link which has been established between the adjacent satellite and the target gateway, and downlink carrier resource information, allocating a downlink carrier resource to the target gateway; and on the basis of the allocated downlink carrier resource, sending a downlink carrier signal to the target gateway.

Description

Single-carrier communication method based on satellite-to-ground backhaul link, target satellite and target gateway

[0001] Cross-reference to related disclosures

[0002] The present disclosure is based on the Chinese patent publication 2024106657491 with the title "Single-carrier communication method based on satellite-to-ground backhaul link, target satellite and target gateway" filed on May 27, 2024, and claims priority to the patent publication, the disclosure of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the field of communication, in particular to a single-carrier communication method based on satellite-to-ground backhaul link, a target satellite and a target gateway. BACKGROUND

[0004] Currently, the schemes for maintaining the continuity of low-orbit satellite link services generally use frequency division multiplexing. Both the satellite and the ground gateway need to use multi-carrier communication with different frequency points. Multi-carrier connections are established through multiple frequency points, and switching is performed between carriers at different frequency points to maintain the continuity of services.

[0005] Through the establishment of multi-carrier to maintain the continuity of services, there are mainly two problems. On the one hand, because multi-carrier signals need to be supported, both the satellite and the ground gateway need to support multi-carrier channel processing, which will have relatively higher device costs and energy consumption than single-carrier channel, and will accordingly increase the weight and energy consumption of the devices on the satellite. On the other hand, the limited nature of satellite spectrum resources is an important problem faced by satellite communication technology. Because the satellite has a larger coverage range relative to the ground microcell and has global mobility characteristics, the multiplexing rate of its spectrum resources is very low, and the spectrum resources are very limited. SUMMARY

[0006] Embodiments of the present disclosure provide a single-carrier communication method based on satellite-to-ground backhaul link, a target satellite and a target gateway.

[0007] According to one embodiment of the present disclosure, a single-carrier communication method based on a satellite-ground backhaul link is provided, which is applied to a target satellite and includes: obtaining adjacent satellite information of the target satellite according to an inter-satellite link, wherein the adjacent satellite information includes communication link information and downlink carrier resource information of adjacent satellites and ground gateways; obtaining ground gateways that can establish a communication link with the target satellite at a current time window according to ephemeris and network configuration information, and generating a gateway candidate set; determining a target gateway of a link to be established with the target satellite according to the adjacent satellite information and the gateway candidate set; calculating a link delay to be established between the target satellite and the target gateway, and allocating downlink carrier resources to the target gateway according to the link delay to be established between the target satellite and the target gateway, and the communication link and downlink carrier resource information of adjacent satellites and the target gateway; and transmitting a downlink carrier signal to the target gateway based on the allocated downlink carrier resources.

[0008] According to one embodiment of the present disclosure, a single-carrier communication method based on a satellite-ground backhaul link is provided, which is applied to a target satellite and includes: obtaining adjacent satellite information of the target satellite according to an inter-satellite link, wherein the adjacent satellite information includes communication link information and downlink carrier resource information of adjacent satellites and ground gateways; obtaining ground gateways that can establish a communication link with the target satellite at a current time window according to ephemeris and network configuration information, and generating a gateway candidate set; determining a target gateway of a link to be established with the target satellite according to the adjacent satellite information and the gateway candidate set; calculating a link delay to be established between the target satellite and the target gateway, and allocating downlink carrier resources to the target gateway according to the link delay to be established between the target satellite and the target gateway, and the communication link and downlink carrier resource information of adjacent satellites and the target gateway; and transmitting a downlink carrier signal to the target gateway based on the allocated downlink carrier resources.

[0009] According to another embodiment of the present disclosure, a target satellite is provided, which includes one or more processors configured to: obtain adjacent satellite information of the target satellite according to an inter-satellite link, wherein the adjacent satellite information includes communication link information and downlink carrier resource information of adjacent satellites and ground gateways; obtain ground gateways that can establish a communication link with the target satellite at a current time according to ephemeris and network configuration information, and generate a gateway candidate set; determine a target gateway of a link to be established according to the adjacent satellite information and the gateway candidate set; calculate a link delay to be established between the target satellite and the target gateway, and allocate downlink carrier resources to the target gateway according to the link delay to be established between the target satellite and the target gateway, and the communication link and downlink carrier resource information of adjacent satellites and the target gateway; and transmit a downlink carrier signal to the target gateway based on the allocated downlink carrier resources.

[0010] According to another embodiment of the present disclosure, a target gateway is provided, comprising one or more processors configured to: receive ephemeris and local position information of a target satellite from a downlink carrier signal transmitted by the target satellite; obtain neighboring gateway information of the target gateway according to a communication link between ground gateways, wherein the neighboring gateway information comprises communication link information and uplink carrier resource information of the neighboring gateway and the target satellite; allocate uplink carrier resources for the target satellite according to a latency of a to-be-established link between the target gateway and the target satellite, and the communication link information and uplink carrier resource information of the neighboring gateway and the target satellite; and establish a communication link with the target satellite based on the allocated uplink carrier resources.

[0011] According to still another embodiment of the present disclosure, a computer readable storage medium is also provided, which stores a computer program, wherein the computer program is configured to perform the steps in any of the above method embodiments when executed.

[0012] According to still another embodiment of the present disclosure, a computer program product is also provided, which comprises a computer program configured to perform the steps in any of the above method embodiments when executed by a processor.

[0013] According to still another embodiment of the present disclosure, an electronic device is also provided, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the steps in any of the above method embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0014] FIG. 1 is a hardware structure block diagram of a mobile terminal based on a single carrier communication method of a satellite-ground backhaul link according to an embodiment of the present disclosure;

[0015] FIG. 2 is a flowchart (I) of a single carrier communication method based on a satellite-ground backhaul link according to an embodiment of the present disclosure;

[0016] FIG. 3 is a flowchart (II) of a single carrier communication method based on a satellite-ground backhaul link according to an embodiment of the present disclosure;

[0017] FIG. 4 is a flowchart (III) of a single carrier communication method based on a satellite-ground backhaul link according to an embodiment of the present disclosure;

[0018] FIG. 5 is a scenario example diagram of a single carrier communication method based on a satellite-ground backhaul link according to an embodiment of the present disclosure;

[0019] FIG. 6 is a structure block diagram of a target satellite according to an embodiment of the present disclosure;

[0020] FIG. 7 is a structure block diagram of a target gateway according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings and in conjunction with the embodiments.

[0022] It should be noted that the terms "target", "second", and the like in the description and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0023] The method embodiments provided in the embodiments of the present disclosure can be executed in a mobile terminal, a computer terminal or similar computing device, which can be located on the satellite side or the ground gateway side. Taking the computer terminal as an example, Fig. 1 is a hardware structure block diagram of a computer terminal running the single carrier communication method based on a satellite-ground backhaul link provided by the embodiments of the present disclosure. As shown in Fig. 1, the computer terminal can include one or more (only one is shown in Fig. 1) processors 102 (the processor 102 can include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 configured to store data, wherein the above-mentioned computer terminal can further include a transmission device 106 configured to have a communication function and an input and output device 108. Those skilled in the art can understand that the structure shown in Fig. 1 is only schematic, which does not limit the structure of the above-mentioned computer terminal. For example, the computer terminal can further include more or less components than those shown in Fig. 1, or have a different configuration from that shown in Fig. 1.

[0024] The memory 104 can be configured to store computer programs, for example, software programs of application software and modules, such as the computer program corresponding to the single carrier communication method based on a satellite-ground backhaul link in the embodiments of the present disclosure. The processor 102 executes various function applications and data processing by running the computer program stored in the memory 104, that is, implements the above-mentioned method. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0025] The transmission device 106 is configured to receive or send data via a network. Specific examples of the network can include a wired or wireless network provided by a communication provider of the computer terminal. In one example, the transmission device 106 includes a network interface controller (NIC) that can be connected to other network devices through a gateway so as to be in communication with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module configured to communicate with the Internet in a wireless manner.

[0026] In the embodiment, a single-carrier communication method based on a satellite-to-ground backhaul link is provided, which is applied to a target satellite. FIG. 2 is a flowchart (one) of the single-carrier communication method based on the satellite-to-ground backhaul link according to the embodiment of the present disclosure. As shown in FIG. 2, the flowchart includes the following steps:

[0027] In step S202, adjacent satellite information of the target satellite is obtained according to an inter-satellite link, where the adjacent satellite information includes communication link information of adjacent satellites and ground gateways and downlink carrier resource information.

[0028] In the embodiment, the inter-satellite link is a communication link between satellites, the communication link information of adjacent satellites and ground gateways is a communication link established between adjacent satellites and ground gateways, and the downlink carrier resource information is a carrier time slot resource occupied when a signal is sent by an adjacent satellite to a ground gateway. The above information of the target satellite can be obtained based on the inter-satellite link.

[0029] In step S204, a ground gateway that can establish a communication link with the target satellite in a current time window is obtained according to ephemeris and network configuration information, and a gateway candidate set is generated.

[0030] In the embodiment, a ground coverage range that can be served by the target satellite in the current time window can be obtained based on the ephemeris, the ground gateways in the range are obtained from the network configuration information based on the range, the related ground gateways are taken as candidate gateways that can establish a link, and a gateway candidate set is generated. The ephemeris is information describing a satellite motion orbit, which is used to calculate the visibility of the satellite on the earth and the time of receiving a signal, and can include information such as the position, speed, and acceleration of the satellite. The network configuration information can include information such as a ground gateway ID, a gateway geographic position, a satellite and gateway communication capability, and the like.

[0031] In step S206, a target gateway to be established with the target satellite is determined according to the adjacent satellite information and the gateway candidate set.

[0032] In the embodiment, the target gateway to be linked with the target satellite can be determined according to the communication link information and the downlink carrier resource information of the adjacent satellite and the ground gateway, and the gateway candidate set.

[0033] In step S208, the link delay between the target satellite and the target gateway is calculated, and the downlink carrier resource is allocated to the target gateway according to the link delay between the target satellite and the target gateway, and the communication link and the downlink carrier resource information of the adjacent satellite and the target gateway.

[0034] In the embodiment, the downlink carrier resource allocated to the target gateway is the downlink carrier time slot resource currently idle for the target satellite, and does not overlap with the downlink carrier time slot resource allocated to the target gateway by the adjacent satellite. The link delay to be built can be calculated by using the ephemeris and the geographic position information. The communication link information of the adjacent satellite and the target gateway can include the gateway ID, the link delay, the link type, the link carrier resource allocation information, and the gateway candidate set that can be linked by the satellite currently, to determine the target gateway to be linked.

[0035] In step S210, the downlink carrier signal is sent to the target gateway based on the allocated downlink carrier resource.

[0036] Through the above steps S202-S210, the communication link information and the downlink carrier resource information of the adjacent satellite are obtained through the inter-satellite link, and the ground gateway that can be linked in the current time window is obtained according to the ephemeris and the network configuration information, the link delay to be built is calculated, the carrier resource is allocated to the ground gateway to be linked, and the downlink carrier signal is sent, which can solve the problems of high cost and energy consumption of satellite and ground gateway side devices in related technologies, and how to reasonably use limited satellite spectrum resources, so as to reduce the device cost and energy consumption, and improve the satellite spectrum resource utilization.

[0037] In the embodiment, a single-carrier communication method based on a satellite-ground backhaul link running on the above computer terminal is provided, which is applied to a ground target gateway. FIG. 3 is a flowchart of a single-carrier communication method based on a satellite-ground backhaul link according to an embodiment of the present disclosure (two), as shown in FIG. 3, the flowchart includes the following steps:

[0038] In step S302, the downlink carrier signal sent by the target satellite is received according to the ephemeris and the local position information.

[0039] In the embodiment, the target gateway detects a signal of a target satellite according to ephemeris and local position information, and receives a downlink carrier signal, and tracks and locks the target satellite of the to-be-established link, wherein the ephemeris is information describing a motion orbit of the satellite, and is used to calculate visibility of the satellite on the earth and a time of receiving a signal, and can include information such as a position, a speed, and an acceleration of the satellite, and the local position information can include longitude and latitude information of the gateway; and the gateway detects a target satellite signal according to ephemeris and local position information, receives a downlink carrier signal, and tracks and locks a target satellite of a to-be-established link.

[0040] In step S304, adjacent gateway information of the target gateway is acquired according to a communication link between ground gateways, wherein the adjacent gateway information includes communication link information and uplink carrier resource information of the adjacent gateway and the target satellite.

[0041] In the embodiment, the adjacent gateway information of the target gateway can be acquired according to an Xn link between ground gateways, wherein the Xn link refers to a communication link between ground gateways, and can include control and management information between ground gateways, link information between a ground gateway and a target satellite, and uplink carrier resource information of the ground gateway, and the adjacent gateway information includes communication link information and uplink carrier resource information of the adjacent gateway and the target satellite.

[0042] In step S306, uplink carrier resources of the target satellite are allocated according to a to-be-established link delay between the target gateway and the target satellite, and communication link information and uplink carrier resource information of an already-established communication link between the adjacent gateway and the target satellite.

[0043] In the embodiment, the uplink carrier resources allocated for the target satellite are uplink carrier time slot resources currently idle for the target gateway, and do not overlap with uplink carrier time slot resources allocated for adjacent satellites by the target gateway. The to-be-established link delay can be calculated by using the communication link and carrier resource information of the adjacent gateway and the target satellite. The link type can also be set according to time slot resource conditions of the established communication link between the target satellite and the target gateway, wherein the link type includes a main link and an auxiliary link.

[0044] In step S308, a communication link is established with the target satellite based on the allocated uplink carrier resources.

[0045] Through the steps S302-S308, according to the ephemeris and the local position information, the downlink carrier signal transmitted by the satellite is received, the communication link information and the uplink carrier resource information of the adjacent gateway and the target satellite are obtained through the network configuration or the communication link (inter-gateway communication protocol link) between the ground gateways, the link time delay is calculated, the uplink carrier resource is allocated, and the communication link is established with the target satellite. The problems of high cost and energy consumption of satellite and ground gateway side devices and how to reasonably use limited satellite spectrum resources in the related art can be solved, and the effects of reducing device cost and energy consumption and improving satellite spectrum resource utilization are achieved.

[0046] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and the necessary general hardware platform, of course, it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the disclosure can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes a plurality of instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the method of each embodiment of the disclosure.

[0047] FIG. 4 is a flowchart of a single-carrier communication method based on a satellite-ground backhaul link according to an embodiment of the disclosure (three), as shown in FIG. 4:

[0048] Step S401, the target satellite side obtains the adjacent satellite information of the target satellite through the inter-satellite link;

[0049] The inter-satellite link is a communication link between a satellite and another satellite, the communication link information of the adjacent satellite and the ground gateway is a communication link established between the adjacent satellite and the ground gateway, and the downlink carrier resource information is a carrier time slot resource occupied by the adjacent satellite when transmitting a signal to the ground gateway.

[0050] Step S402, the target satellite side obtains the ground gateway that can establish a communication link with the target satellite in the current time window according to the ephemeris and the network configuration information, and generates a candidate set of the target satellite that can establish a link;

[0051] The target satellite side can obtain the ground coverage range that can be served by the target satellite in the current time window based on the ephemeris, obtain the ground gateway in the range from the network configuration information based on the range, take the related ground gateway as a candidate gateway that can establish a link, and generate a gateway candidate set. The ephemeris is information describing the motion orbit of the satellite, which is used to calculate the visibility of the satellite on the earth and the time of receiving a signal, and can include the position, speed, and acceleration of the satellite. The network configuration information can include the gateway ID, the geographic position of the gateway, the communication capability of the satellite and the gateway, and the like.

[0052] Step S403: The target satellite side determines the target gateway with which the link to be established with the target satellite is to be determined based on the neighboring satellite information and the gateway candidate set, calculates the link delay between the target satellite and the target gateway, and allocates downlink carrier resources to the target gateway based on the link delay between the target satellite and the target gateway, as well as the communication links and downlink carrier resource information already established between the neighboring satellites and the target gateway, and sends downlink carrier signals to the target gateway based on the allocated downlink carrier resources.

[0053] The target satellite can determine the target gateway for establishing a link with the target satellite based on communication link information between neighboring satellites and ground gateways, downlink carrier resource information, and a candidate set of gateways. Then, it sends downlink carrier signals to the target gateway based on the allocated downlink carrier resources. The downlink carrier resources allocated to the target gateway are the target satellite's currently available downlink carrier time slots and do not overlap with downlink carrier time slots already allocated to the target gateway by neighboring satellites. The link delay to be established can be calculated using ephemeris and geographic location information. The established communication link information between neighboring satellites and the target gateway can include gateway ID, link delay, link type, link carrier resource allocation information, and the current candidate set of gateways available for link establishment by the satellite, thus determining the target gateway for establishing the link.

[0054] Step S404: The ground gateway receives the downlink carrier signal sent by the target satellite based on the ephemeris and local location information;

[0055] The ground gateway can detect the target satellite's signal and receive downlink carrier signals based on ephemeris and local location information, and track and lock onto the target satellite for the link to be established. Ephemeris is information describing the satellite's orbit and is used to calculate the satellite's visibility on Earth and the time of signal reception. It can include information such as the satellite's position, velocity, and acceleration. Local location information can include the gateway's latitude and longitude. The ground gateway detects the target satellite's signal, receives downlink carrier signals, and tracks and locks onto the target satellite for the link to be established based on the ephemeris and local location information.

[0056] Step S405: The ground gateway side obtains the neighboring gateway information of the target gateway based on the communication links between ground gateways;

[0057] The ground gateway can obtain the neighboring gateway information of the target gateway based on the Xn link between ground gateways. The Xn link refers to the communication link between ground gateways, which may include control and management information between ground gateways, link information between ground gateways and target satellites, and uplink carrier resource information of ground gateways. The neighboring gateway information includes the communication link information between neighboring gateways and target satellites and uplink carrier resource information.

[0058] In step S406, the ground gateway allocates uplink carrier resources to the target satellite based on the delay of the link to be established between the target gateway and the target satellite, as well as the communication link information and uplink carrier resource information of the adjacent gateways and the target satellite, and establishes a communication link with the target satellite based on the allocated uplink carrier resources.

[0059] The uplink carrier resources allocated to the target satellite are the currently available uplink carrier time slots of the target gateway, and do not overlap with the uplink carrier time slots allocated by the target gateway to adjacent satellites. The latency of the link to be established can be calculated using the communication link and carrier resource information of adjacent gateways and the target satellite. The link type can also be set according to the time slot resource availability of the communication link between the established target satellite and the target gateway; the link type includes primary link and secondary link.

[0060] Through the embodiments disclosed herein, by utilizing uplink and downlink single-carrier channels and establishing satellite-to-ground backhaul link communication connections via inter-satellite links, gateway links, ephemeris data, network configuration information, and carrier resource information of the communication links in the backhaul link system, service continuity support for backhaul links in high-speed low-Earth orbit satellite scenarios is achieved. This reduces equipment costs and energy consumption while improving the utilization rate of satellite spectrum resources. It at least addresses the problems of high costs and energy consumption of satellite and ground gateway-side equipment in related technologies, as well as the challenge of how to rationally utilize limited satellite spectrum resources.

[0061] Figure 5 is a scenario example diagram of a single-carrier communication method based on a satellite-to-ground backhaul link according to an embodiment of the present disclosure. As shown in Figure 5, the satellite and the ground gateway (GW) support uplink and downlink single-carrier communication respectively. The direction from the satellite to the ground gateway is defined as downlink, and the direction from the ground gateway to the satellite is defined as uplink. The carrier is in time slots and can establish two communication links with two communication entities in a time-division multiplexing manner.

[0062] The following describes the processing flow of an embodiment, taking the process of establishing L3 and L4 communication links between satellite 2, GW2, and GW3 as an example;

[0063] 1) Before establishing communication links between L3 and L4, Satellite 2 obtains communication link information between two adjacent satellites, Satellite 1 and Satellite 3, based on the inter-satellite link;

[0064] The L2 communication link established between satellite 1 and GW2 was obtained, and the downlink carrier used the D1, D2, D5, and D6 time slot resources on satellite 1;

[0065] The L5 communication link established between satellite 3 and GW3 was obtained, and the downlink carrier used the D5 time slot resource on satellite 3;

[0066] Based on ephemeris and network configuration information, Satellite 2 obtains that there are two ground gateways, GW2 and GW3, within the geographical area that Satellite 2 can cover at the current time. Each satellite and ground gateway can support the establishment of two communication links at the same time.

[0067] GW2 has already established an L2 communication link with neighboring satellite 1, and it can also support the establishment of a new communication link. Therefore, GW2 can serve as the ground gateway for satellite 2 to establish a link.

[0068] GW3 has already established an L5 communication link with the neighboring satellite 3, and it can also support the establishment of a new communication link. Therefore, GW3 can also serve as the ground gateway for satellite 2 to establish a link.

[0069] Satellite 2 calculates downlink resources between the target ground gateways GW2 and GW3;

[0070] The process of satellite 2 sending downlink carrier signal resource calculation to the target ground gateway GW2: Satellite 2 calculates the delay of the L3 link to be established between it and GW2 using ephemeris and GW2's geographical location information. Then, based on the L3 and L2 delays and the downlink time slot resources allocated by satellite 1 to GW2, it calculates the downlink carrier resources allocated by satellite 2 to the L3 link to be established.

[0071] Calculation requirements: The calculated time slot resources do not overlap with the downlink time slot resources allocated by satellite 1 to GW2, and are currently the idle time slot resources of satellite 2. As shown in the figure, satellite 2 allocates time slot D3 to the L3 link to send downlink carrier signals to GW2.

[0072] The process of satellite 2 sending downlink carrier signal resource calculation to the target ground gateway GW3: Satellite 2 calculates the L4 link delay to be established between it and GW3 using ephemeris and GW3's geographical location information. Then, based on the L4 and L5 delays and the downlink time slot resources allocated by satellite 3 to GW3, it calculates the downlink carrier resources allocated by satellite 2 to the L4 link.

[0073] Calculation requirements: Calculate the downlink time slot resources that do not overlap with those allocated to GW3 by satellite 3, and which are currently available time slot resources of satellite 2. As shown in the figure, calculate the D1, D2, D5, and D6 time slots that satellite 2 can allocate to the L4 link to send downlink carrier signals to GW3.

[0074] Ground gateway processing: Based on ephemeris and geographic location information, the GW2 ground gateway instructs the radio frequency end to receive the downlink carrier signal from satellite 2, receives and demodulates the downlink carrier D3 time slot signal sent by satellite 2, and obtains the communication link information between the two adjacent ground gateways GW1 and GW3 and the satellite through the Xn link. It is found that no communication link has been established between GW1, GW3 and satellite 2, indicating that satellite 2 can receive uplink signals in any time slot. Currently, the uplink time slots U1, U2, U5 and U6 of GW2 have been used for L2 links, so the available idle uplink carrier time slots of GW2 are U3 and U4. In the example, GW2 selects the idle time slot U4 to initiate the communication link establishment to satellite 2 and establishes the L3 communication link.

[0075] Based on ephemeris and geographic location information, GW3 instructs the radio frequency end to receive downlink D1, D2, D5, and D6 time slot signals from satellite 2. GW3 obtains the communication link information between GW2 and the satellite through the Xn link and finds that GW2 and satellite 2 have established an L3 communication link. Based on the L3 link delay, the delay of the L4 link to be established, and the uplink carrier time slot resources allocated by GW2 to satellite 2, GW3 calculates the uplink carrier resources allocated by GW3 to the L4 link.

[0076] Calculation requirements: The calculated resources do not overlap with the uplink carrier time slot resources allocated by GW2 to satellite 2, and are also the currently available uplink time slots of GW3;

[0077] As shown in the figure, the non-overlapping uplink carrier time slots allocated by GW2 to satellite 2 are U1, U2, U3, U5, and U6 (time slot U4 has already been used for the L3 link). Meanwhile, the L5 link between GW3 and satellite 3 uses time slot U3. Therefore, the uplink time slots U1, U2, U5, and U6 of GW3 can be used for the L4 communication link to be established with satellite 2. The L4 communication link can be established using these resources. At the same time, the link type can be set according to the time slot resources of the communication link. For example, for the two communication links L3 and L4 established by satellite 2, since L4 has more carrier resources, L4 can be set as the primary link and L3 as the secondary link.

[0078] The above processing steps establish L3 and L4 communication links between satellite 2 and ground gateways GW2 and GW3, respectively, and ensure that the uplink and downlink carrier resources between the relevant communication links do not overlap. This achieves the establishment of dual links through time-division multiplexing in a single-carrier scenario for satellite-to-ground backhaul links. Based on this communication link establishment method, the system can support applications such as seamless switching of communication links during satellite mobility.

[0079] Figure 6 is a structural block diagram of a target satellite according to an embodiment of the present disclosure. The target satellite 602 is one of the satellites forming a satellite-to-ground communication system with a ground gateway. The target satellite 602 supports single-carrier communication with the ground gateway. The direction from the satellite to the ground gateway is defined as downlink, and the direction from the ground gateway to the target satellite is defined as uplink. The carrier is in time slots. The target satellite 602 can establish two communication links with, for example, two ground gateways in a time-division multiplexing manner. As shown in Figure 6, the target satellite 602 may include one or more processors 6022. These processors 6022 may be processors configured to transmit and receive data, or processors that perform data processing and calculations to implement other functions. The one or more processors 6022 perform the following operations to establish a single-carrier communication link between the target satellite 602 and the ground gateway:

[0080] Information about neighboring satellites of the target satellite is obtained based on inter-satellite links. This information includes communication link information between neighboring satellites and ground gateways, as well as downlink carrier resource information.

[0081] Based on ephemeris and network configuration information, identify the ground gateways that can establish communication links with the target satellite in the current time window and generate a candidate set of gateways;

[0082] Based on neighboring satellite information and the gateway candidate set, the target gateway for the link to be established is determined;

[0083] Calculate the latency of the link to be established between the target satellite and the target gateway, and allocate downlink carrier resources to the target gateway based on the latency of the link to be established between the target satellite and the target gateway, as well as the communication links and downlink carrier resource information of the adjacent satellites and the target gateway.

[0084] The downlink carrier signal is sent to the target gateway based on the allocated downlink carrier resources.

[0085] In one embodiment, the target satellite 602 can obtain the ground coverage range that the target satellite can serve in the current time window according to the ephemeris. Based on the ground coverage range, it can obtain the gateways within the ground coverage range from the network configuration information as candidate gateways for establishing communication links and generate a gateway candidate set.

[0086] In one embodiment, the downlink carrier resources allocated to the target gateway are the currently idle downlink carrier time slot resources of the target satellite, and do not overlap with the downlink carrier time slot resources already allocated to the target gateway by neighboring satellites.

[0087] Figure 7 is a structural block diagram of a target gateway according to an embodiment of the present disclosure. The target gateway 702 may be one of multiple ground gateways forming a satellite-to-ground communication system. The target gateway 702 supports single-carrier communication with the satellite. The direction from the ground gateway to the satellite is defined as uplink, and the direction from the satellite to the ground gateway is defined as downlink. The carrier is in time slots, and the target gateway can establish two communication links with, for example, two satellites using time-division multiplexing. As shown in Figure 7, the target gateway 702 may include one or more processors 7022. These processors may be processors configured to transmit and receive data, or processors that perform data processing and calculations to implement other functions. The one or more processors 7022 perform the following operations to establish a single-carrier communication link between the target gateway 702 and the satellite:

[0088] Receive downlink carrier signals transmitted by the target satellite based on ephemeris and local location information;

[0089] The neighboring gateway information of the target gateway is obtained based on the communication links between ground gateways. The neighboring gateway information includes the communication link information between the neighboring gateway and the satellite and the uplink carrier resource information.

[0090] Based on the latency of the link to be established between the target gateway and the target satellite, as well as the communication link information and uplink carrier resource information of the adjacent gateways and the target satellite, uplink carrier resources are allocated to the target satellite.

[0091] A communication link is established with the target satellite based on the allocated uplink carrier resources.

[0092] In one embodiment, the target gateway 702 can detect the signal of the target satellite based on ephemeris and local location information, receive downlink carrier signals, track and lock the target satellite of the link to be established, wherein the local location information includes the latitude and longitude information of the target gateway.

[0093] In one embodiment, the uplink carrier resources allocated to the target satellite are the currently idle uplink carrier time slot resources of the target gateway, and do not overlap with the uplink carrier time slot resources allocated by the target gateway to neighboring satellites.

[0094] In one embodiment, the link type can be set according to the time slot resource availability of the communication link between the established target satellite and the target gateway, wherein the link type includes a primary link and a secondary link.

[0095] Embodiments of this disclosure also provide a computer-readable storage medium storing a computer program configured to perform the steps in any of the above method embodiments when executed.

[0096] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard disk, magnetic disk, or optical disk.

[0097] Embodiments of this disclosure also provide a computer program product, including a computer program that, when executed by a processor, implements the steps in any of the above method embodiments.

[0098] Embodiments of this disclosure also provide an electronic device including a memory and a processor, the memory storing a computer program and the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

[0099] In one exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0100] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0101] It is obvious to those skilled in the art that the modules or steps of this disclosure described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this disclosure is not limited to any particular combination of hardware and software.

[0102] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A single-carrier communication method based on a satellite-to-ground backhaul link, applied to a target satellite, the method comprising: obtaining adjacent satellite information of the target satellite according to an inter-satellite link, wherein the adjacent satellite information comprises communication link information and downlink carrier resource information of adjacent satellites and ground gateways; obtaining ground gateways that can build a communication link with the target satellite in a current time window according to ephemeris and network configuration information, and generating a gateway candidate set; determining a target gateway to build a link with the target satellite according to the adjacent satellite information and the gateway candidate set; calculating a link delay between the target satellite and the target gateway to be built, and allocating downlink carrier resources to the target gateway according to the link delay between the target satellite and the target gateway to be built, and the adjacent satellite and the target gateway built communication link and downlink carrier resource information; sending a downlink carrier signal to the target gateway based on the allocated downlink carrier resources.

2. The method of claim 1, wherein, obtaining ground gateways that can build a communication link with the target satellite in a current time window according to ephemeris and network configuration information, and generating a gateway candidate set, comprising: obtaining a ground coverage range that the target satellite can serve in a current time window according to the ephemeris; obtaining gateways in the ground coverage range from the network configuration information as candidate gateways that can build a communication link according to the ground coverage range, and generating the gateway candidate set.

3. The method of claim 1, wherein, The downlink carrier resources allocated to the target gateway are the current idle downlink carrier time slot resources of the target satellite, and do not overlap with the downlink carrier time slot resources allocated to the target gateway by the adjacent satellites. 4.A single-carrier communication method based on a satellite-to-ground backhaul link, applied to a target ground gateway, the method comprising: receiving a downlink carrier signal sent by a target satellite according to ephemeris and local position information; obtaining adjacent gateway information of the target gateway according to a communication link between ground gateways, wherein the adjacent gateway information comprises communication link information and uplink carrier resource information of the adjacent gateway and the target satellite; allocating uplink carrier resources to the target satellite according to the link delay between the target gateway and the target satellite to be built, and adjacent gateway and target satellite built communication link information and uplink carrier resource information; establishing a communication link with the target satellite based on the allocated uplink carrier resources.

5. The method of claim 4, wherein, Receiving the downlink carrier signal sent by the target satellite according to the ephemeris and the local position information comprises: detecting a signal of the target satellite according to the ephemeris and the local position information, and receiving the downlink carrier signal, tracking and locking the target satellite to be built link, wherein the local position information comprises longitude and latitude information of the target gateway.

6. The method of claim 4, wherein, The uplink carrier resources allocated to the target satellite are the current idle uplink carrier time slot resources of the target gateway, and do not overlap with the uplink carrier time slot resources allocated to adjacent satellites by the target gateway.

7. The method of claim 4, wherein, Further comprising: setting a link type according to a time slot resource condition of the established communication link between the target satellite and the target gateway, wherein the link type comprises a primary link and a secondary link. 8.A target satellite comprising one or more processors configured to: acquire neighboring satellite information of the target satellite according to an inter-satellite link, wherein the neighboring satellite information comprises communication link information and downlink resource information of neighboring satellites with ground gateways; acquire ground gateways that can establish a communication link with the target satellite at a current time window according to ephemeris and network configuration information, and generate a gateway candidate set; determine a target gateway of a to-be-established link according to the neighboring satellite information and the gateway candidate set; calculate a to-be-established link delay between the target satellite and the target gateway, and allocate downlink resources to the target gateway according to the to-be-established link delay between the target satellite and the target gateway, and the communication link and downlink resource information of the neighboring satellites and the target gateway; and transmit a downlink signal to the target gateway based on the allocated downlink resources. 9.A target gateway comprising one or more processors configured to: receive a downlink signal transmitted by a target satellite according to ephemeris and local position information; acquire neighboring gateway information of the target gateway according to a communication link between ground gateways, wherein the neighboring gateway information comprises communication link information and uplink resource information of the neighboring gateways with satellites; allocate uplink resources to the target satellite according to a to-be-established link delay between the target gateway and the target satellite, and the communication link information and uplink resource information of the neighboring gateways and the target satellite; and establish a communication link with the target satellite based on the allocated uplink resources. The computer program, when executed by the processor, implements the steps of the method recited in any one of claims 1 to 7. 11.A computer program product comprising a computer program, which, when executed by a processor, implements the steps of the method recited in any one of claims 1 to 7. 12.An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method recited in any one of claims 1 to 7. ​ ​ ​ ​ ​ ​ 10. A computer-readable storage medium having stored therein a computer program, wherein, ​ ​ ​

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