Satellite load system and on-satellite processing method

Abstract

The invention provides a satellite load system and an on-satellite processing method, and relates to the technical field of communication, the satellite load system comprises a baseband processing unit; the baseband processing unit is used for acquiring terminal types and compliance frequency bands of terminals in a target service area of a target satellite; the baseband processing unit is used for determining a target parameter adapted to the compliance frequency band according to the terminal type and the compliance frequency band, and determining the beam direction angle according to the width of a beam projected by a satellite antenna corresponding to the compliance frequency band; wherein the target parameter and the beam direction angle are used for communication between the terminal and the target satellite in the target service area. The satellite load system provided by the invention can save resources and reduce the launching cost.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and in particular to a satellite payload system and an on-board processing method. Background Art

[0002] In the on-board processing mode, base stations or even core network elements are deployed on satellites, which can reduce the air interface transmission delay and establish inter-satellite links, facilitating the landing of data in overseas regions. Therefore, with the continuous advancement of the space-ground integration process, on-board processing will be an irresistible trend.

[0003] Facing the increasing traffic volume, a single-standard satellite is difficult to meet the communication needs of users, and the satellite launch cost is usually high. Therefore, a more practical solution is to carry multiple sets of hardware devices supporting different standards on the same satellite. However, the space, power, power supply, etc. of the on-board payload platform of the satellite are severely limited. In the existing deployment mode, on the one hand, the weight and power consumption of a single satellite carrying a full set of hardware devices with different frequency bands and different standards are extremely large, which requires a high level for the on-board payload platform and will also significantly increase the launch cost; on the other hand, to meet the needs of different services, the on-board payload platform of the satellite needs to be designed according to the maximum service capacity during the design stage. However, satellite communication services are usually unevenly distributed, resulting in serious resource waste. Summary of the Invention

[0004] The purpose of the technical solution of the present invention is to provide a satellite payload system and an on-board processing method to solve the problems of high cost and resource waste of the on-board payload platform of the satellite in the prior art.

[0005] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] The embodiments of the present invention provide a satellite payload system, including: a baseband processing unit;

[0007] The baseband processing unit is used to obtain the terminal type and compliant frequency band of terminals in the target service area of the target satellite;

[0008] The baseband processing unit is used to determine the target parameters adapted to the compliant frequency band according to the terminal type and the compliant frequency band, and determine the beam direction angle of the beam according to the width of the beam projected by the satellite antenna corresponding to the compliant frequency band; wherein, the target parameters and the beam direction angle are used for the terminals to communicate with the target satellite in the target service area.

[0009] Optionally, the baseband processing unit is further used to:

[0010] Determine the relative position between the satellite operation trajectory of the target satellite and the target service area according to the ephemeris information of the target satellite.

[0011] Optionally, the baseband processing unit is further configured to:

[0012] Obtain satellite attitude-related parameters of the target satellite;

[0013] Determine whether the target satellite can provide services within the target service area according to the satellite attitude-related parameters.

[0014] Optionally, the satellite payload system further includes a radio frequency unit and a beam control unit;

[0015] The baseband processing unit is further configured to send the beam direction angle to the radio frequency unit;

[0016] The radio frequency unit is configured to send the beam direction angle to the beam control unit;

[0017] The beam control unit is configured to adjust the direction of the service beam projected by the satellite antenna according to the beam direction angle, and the terminal communicates with the target satellite in the direction of the service beam.

[0018] Optionally, the terminal type includes at least one frequency band type, and the compliant frequency bands corresponding to terminals of different frequency band types are different;

[0019] The radio frequency unit and the beam control unit corresponding to terminals of different frequency band types are different.

[0020] Optionally, when there are at least two frequency band types of terminals in the target service area, the baseband processing unit is further configured to:

[0021] Control the satellite antennas projecting control beams in the corresponding compliant frequency bands respectively through the radio frequency units corresponding to terminals of different frequency band types, and the control beams carry the synchronization signal block SSB corresponding to the target parameters;

[0022] When the terminal receives the SSB and accesses the corresponding control beam according to the SSB, obtain the access information of the terminal sent by the radio frequency unit;

[0023] Configure a service beam for the terminal according to the access information.

[0024] Optionally, the baseband processing unit configures a service beam for the terminal according to the access information, including:

[0025] The baseband processing unit obtains the service prior information of the target service area in the previous satellite orbit period;

[0026] The baseband processing unit determines the initial configuration quantity and initial scheduling resources of different service beams according to the service prior information; wherein, the different service beams correspond to different compliant frequency bands.

[0027] The baseband processing unit determines the quantity related information of the terminals accessed under different control beams according to the control beam accessed by the terminal indicated by the access information.

[0028] The baseband processing unit adjusts the configuration quantity of the service beam corresponding to the control beam and the scheduling resources of the service beam according to the first information, where the first information includes at least one of the following: the quantity related information, the initial configuration quantity, and the service prior information.

[0029] Optionally, the quantity related information includes at least one of the following:

[0030] The quantity of terminals;

[0031] The quantity of cell temporary user identifiers C-RNTI;

[0032] The quantity of random numbers.

[0033] Optionally, the baseband processing unit adjusts the configuration quantity of the service beam corresponding to the control beam and the scheduling resources of the service beam according to the first information, including at least one of the following:

[0034] If the baseband processing unit determines that the quantity of terminals accessed under the target control beam is greater than or equal to the initial configuration quantity of the service beam corresponding to the target control beam, it adjusts the configuration quantity of the service beam corresponding to the target control beam and the scheduling configuration resources according to the quantity of the accessed terminals.

[0035] If the baseband processing unit determines that the first quantity corresponding to the target control beam is greater than or equal to the second quantity corresponding to the service beam of the target control beam in the prior information, it adjusts the configuration quantity of the service beam corresponding to the target control beam and the scheduling configuration resources according to the processing capacity of the baseband processing unit and the first quantity.

[0036] Wherein, the target control beam is any beam in the control beams.

[0037] The first quantity includes at least one of the following: the quantity of C-RNTI, the quantity of random numbers;

[0038] The second quantity includes at least one of the following: the quantity of terminals, the number of radio resource control RRC connections.

[0039] An embodiment of the present invention further provides an on-board processing method, which is applied to the satellite payload system described in any one of the above, and the method includes:

[0040] Obtain the terminal types and compliant frequency bands of terminals within the target service area of the target satellite;

[0041] Determine the target parameters adapted to the compliant frequency band according to the terminal type and the compliant frequency band;

[0042] Determine the beam direction angle of the beam projected by the satellite antenna corresponding to the compliant frequency band; wherein, the target parameters and the beam direction angle are used for the terminal to communicate with the target satellite within the target service area.

[0043] At least one of the above technical solutions of the present invention has the following beneficial effects:

[0044] The satellite payload system provided by the solution of the present invention includes: a baseband processing unit. The baseband processing unit obtains the terminal types and compliant frequency bands of terminals within the target service area of the target satellite, and the baseband processing unit determines the target parameters adapted to the compliant frequency band according to the terminal type and the compliant frequency band, that is, different target parameters are determined according to different compliant frequency bands, saving resources, and the baseband processing unit determines the beam direction angle of the beam according to the width of the beam projected by the satellite antenna corresponding to the compliant frequency band, that is, the direction angle of the service beam projected is determined according to different compliant frequency bands, reducing the transmission cost. Description of the Drawings

[0045] Figure 1 It is a schematic structural diagram of the satellite payload system provided by an embodiment of the present invention;

[0046] Figure 2 It is one of the specific working flowcharts of the satellite payload system provided by an embodiment of the present invention;

[0047] Figure 3 It is the second of the specific working flowcharts of the satellite payload system provided by an embodiment of the present invention;

[0048] Figure 4 It is a flowchart of the on-board processing method provided by an embodiment of the present invention. Detailed Embodiments

[0049] To make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the drawings and specific embodiments.

[0050] Before describing the specific embodiments of the present invention, the following explanations are made first:

[0051] Traditional satellite communication can provide satellite communication services for two types of terminals: satellite handheld terminals and very small aperture terminals (VSATs). Due to the limited transmit power of satellite handheld terminals, in order to reduce the transmission path loss, it is usually required to use the sub-6GHz low-frequency band. Currently, the main satellite operators in the sub-6GHz low-frequency band are Inmarsat and Tian Tong, which adopt private satellite protocols based on the L / S band.

[0052] With the increasing communication demand, the traditional satellite industry is constantly developing towards high throughput. To meet the high-throughput demand, satellite operators have shifted their attention to high-frequency bands such as Ka and Ku with richer spectrum resources. The high-frequency band only supports the direct connection of large VSAT-type terminals to satellites. These terminals are mainly deployed in scenarios such as vehicles and ships to achieve in-vehicle and in-cabin network coverage. Currently, the mainstream high-throughput satellites are mainly operated by ChinaSat, and adopt customized private protocols based on the Digital Video Broadcasting (DVB) system.

[0053] However, due to different satellite operators, the customized protocols of different satellites are usually not publicly available, and the degree of satellite privatization is relatively high. Therefore, it is impossible to achieve protocol unification and integration, which severely restricts the development of the satellite industry. In recent years, the public's requirements for communication services have also become higher and higher, and satellite-terrestrial integration has received extensive attention in the industry. Mobile direct-to-satellite has become a popular technology field. International standard organizations such as 3GPP are promoting the standardization of non-terrestrial networks (NTNs) for satellite-terrestrial integration. Currently, the standardization of the L and S bands that support mobile direct-to-satellite has been completed, and it is also constantly exploring high-frequency bands above 10GHz with richer spectrum resources. Subsequently, the Ka band will also become the standard band for NTNs.

[0054] To solve the problems of high cost and resource waste in the satellite on-board payload platform in the prior art, the satellite payload system and on-board processing method provided by the embodiments of the present invention are provided.

[0055] As Figure 1 shown, the embodiments of the present invention provide a satellite payload system, including: a baseband processing unit;

[0056] The baseband processing unit is used to obtain the terminal types and compliant frequency bands of terminals within the target service area of the target satellite. Among them, the terminal types include at least one frequency band type, that is, the compliant frequency bands corresponding to different types of terminals are different. In this embodiment, taking the terminal types including two frequency band types as an example, the terminals of the two frequency band types include high-frequency band terminals and low-frequency band terminals. VSAT terminals use high-frequency bands above 10 GHz such as Ka and Ku, and are mainly applied to scenarios of communication while moving such as on ships and vehicles, and can be considered as high-frequency band terminals. Mobile phone direct satellite communication uses sub-6 GHz low-frequency bands, and is mainly applied to remote areas such as suburbs, mountains, and deserts to provide communication services for handheld terminal users, and mobile phone terminals can be considered as low-frequency band terminals.

[0057] The baseband processing unit is used to determine the target parameters adapted to the compliant frequency band according to the terminal type and the compliant frequency band, and, determine the beam direction angle of the beam according to the width of the beam projected by the satellite antenna corresponding to the compliant frequency band; wherein, the target parameters and the beam direction angle are used for the terminal to communicate with the target satellite within the target service area.

[0058] Specifically, the baseband processing unit divides according to whether there are multiple types of service terminals (that is, terminals of at least two frequency band types) and compliant frequency bands within the target service area, and adopts a parameter set (that is, target parameters) adapted to this compliant frequency band according to the corresponding compliant frequency band, that is, the baseband processing unit allocates different resources to terminals corresponding to different compliant frequency bands, and, the baseband processing unit calculates the beam direction angle corresponding to the service beam in combination with the width of the service beam projected by the satellite antenna of the corresponding compliant frequency band, and the beam direction angle can be one or more.

[0059] It should be noted that the satellite antenna can include types such as phased array antennas and reflector antennas, and is used to project beams to wave positions.

[0060] In an alternative embodiment, the baseband processing unit is further used to:

[0061] Determine the relative position between the satellite operation trajectory of the target satellite and the target service area according to the ephemeris information of the target satellite, wherein the ephemeris information of the target satellite is preset in the baseband processing unit. The baseband processing unit calculates the relative position relationship between the target satellite and the ground service area according to the preset ephemeris information of the target satellite (which can also be called the current satellite). The ground service area includes the target service area. Furthermore, the baseband processing unit can judge the relative position between the target satellite and the target service area, and can also determine the compliant frequency band corresponding to the target service area.

[0062] It should be noted that taking the compliance frequency band including two compliance frequency bands as an example, if the target service area only corresponds to one compliance frequency band, then the other compliance frequency band does not correspond to the target service area. All computing units and processing resources of the baseband processing unit are only for the time domain of the compliance frequency band corresponding to the target service area, and the baseband processing unit does not need to additionally consider adapting to the other compliance frequency band, avoiding waste of energy consumption and resources.

[0063] In an optional embodiment, the baseband processing unit is further configured to:

[0064] Obtain satellite attitude-related parameters of the target satellite. Specifically, the target satellite measures its own attitude-related parameters and sends them to the baseband processing unit. Among them, the satellite attitude-related parameters include at least one of the following: satellite attitude information, satellite field of view angle information, orbital altitude information;

[0065] According to the satellite attitude-related parameters, determine whether the target satellite can provide services in the target service area, that is, the baseband processing unit determines whether the target service area is within the range where the target satellite can provide services according to the satellite attitude-related parameters. If the target service area is not within the range where services can be provided, wait for the next judgment opportunity. If the target service area is within the range where services can be provided, calculate the beam reverse angle of the service beam projected by the antenna corresponding to the compliance frequency band.

[0066] Furthermore, the satellite payload system further includes a radio frequency unit and a beam control unit;

[0067] The baseband processing unit is further configured to send the beam direction angle to the radio frequency unit;

[0068] The radio frequency unit is configured to send the beam direction angle to the beam control unit;

[0069] The beam control unit is configured to adjust the direction of the service beam projected by the satellite antenna according to the beam direction angle to provide communication services for terminals in the target service area. The terminals communicate with the target satellite in the direction of the service beam. Specifically, the beam control unit includes an antenna control unit. The antenna control unit calculates the antenna element parameter matrix according to the beam direction angle and indicates the pointing direction of the service beam of the satellite antenna through the antenna element parameter matrix.

[0070] It should be noted that the terminal type includes at least one frequency band type, and the compliance frequency bands corresponding to different frequency band types of terminals are different; the radio frequency units and beam control units corresponding to different frequency band types of terminals are different, such as Figure 1As shown in the figure, in the embodiments of the present invention, taking the terminal type including two frequency band types as an example, and taking the two frequency band type terminals including a high frequency band terminal and a low frequency band terminal as an example, the high frequency band terminal corresponds to a high frequency band antenna, a high frequency band wave control unit, and a high frequency band radio frequency unit, and the low frequency band terminal corresponds to a low frequency band antenna, a low frequency band wave control unit, and a low frequency band radio frequency unit. However, the embodiments of the present invention are not limited thereto.

[0071] That is, as Figure 1 shown, taking the L / S low frequency band specified by 3GPP and the Ka frequency band (high frequency band) above 10 GHz under discussion as an example, both the L / S frequency band and the Ka frequency band adopt the 3GPP NTN on-satellite processing architecture (i.e., the satellite payload system). Based on 3GPP NTN, the on-satellite payload system includes a baseband processing unit uniformly arranged, and radio frequency units, wave control systems, and antennas respectively arranged for the high and low frequency bands. Among them, the baseband processing unit is responsible for the unified baseband processing functions of the high and low frequency bands, and adaptively adjusts the parameter sets for the high and low frequency band radio frequency units based on the implementation method of internal resource coordination; each part of the radio frequency unit includes a remote unit corresponding to the frequency band and is connected to a wave control system that controls the beam pointing of the corresponding compliant frequency band; the wave control system calculates the antenna element parameter matrix by the antenna control unit to indicate the antenna beam pointing direction; the antenna can include types such as phased array antennas and reflector antennas, and is used to project beams to the wave positions. It should be noted that Figure 1 only taking a single satellite supporting only two satellite frequency bands of the L / S frequency band and the Ka frequency band as an example, the actual number of spaceborne devices that can support different frequency bands and systems can be comprehensively evaluated according to the networking requirements and the carrying capacity of the satellite payload system.

[0072] In an alternative embodiment, when there are at least two frequency band type terminals in the target service area, the baseband processing unit is further configured to:

[0073] The radio frequency units corresponding to terminals of different frequency band types respectively control the satellite antenna to project control beams for corresponding compliant frequency bands, and the control beams carry the synchronization signal block (SSB) corresponding to the target parameters; when the terminal receives the SSB and accesses the corresponding control beam according to the SSB, obtain the access information of the terminal sent by the radio frequency unit; configure a service beam for the terminal according to the access information. Exemplarily, taking the terminal including two frequency band types (low frequency band terminal and high frequency band terminal) as an example, the baseband processing unit controls the low frequency band antenna (such as a phased array antenna) to project a device control beam through the low frequency band radio frequency unit, and controls the high frequency band antenna (such as a phased array antenna) to project a device control beam through the high frequency band radio frequency unit. The control beam carries the SSB adopting an adapted corresponding parameter set, and the control beam polls all wave positions within the coverage of the target service area according to a preset hopping rule. Terminals of different frequency band types search for the control beam carrying the SSB by themselves. When the control beam of the corresponding frequency band hops to its wave position, the terminal can receive the corresponding SSB and perform random access on the corresponding control beam. The baseband processing unit of the on-board device schedules and further configures the corresponding service beam according to the access information of the terminal transmitted by the radio frequency units of different frequency bands, which is used for subsequent user services, internal processing of the baseband processing unit and further dynamic allocation of computing resources. The terminal is unaware of this process.

[0074] The number of SSBs sent by the baseband processing unit corresponds to the parameter set it uses. Since the number of SSBs configured for the high frequency band and the low frequency band is different, in order to ensure the polling efficiency of the control beam, the number of control beams of the satellite antenna in different frequency bands should be the same as the number of SSBs in the corresponding configuration.

[0075] It should be noted that the beams projected by the above satellite antenna include the service beam and the control beam.

[0076] Further, the baseband processing unit configures a service beam for the terminal according to the access information, including:

[0077] The baseband processing unit obtains the prior service information of the target service area in the previous satellite orbit period. It should be noted that the prior information on the service situation of the target service area in the previous orbit period can be stored in the ground control center or the satellite payload system. The content included in the prior information includes at least one of the following: the number of different types of terminals in the target service area, the distribution density of different types of terminals in the target service area, and the radio resource control (RRC) connection duration.

[0078] The baseband processing unit determines the initial configuration quantity and initial scheduling resources of different service beams according to the service prior information. Among them, the different service beams correspond to different compliant frequency bands, that is, before the on-demand scheduling of service beams, the baseband processing unit performs the initial quantity configuration of the service beams in the corresponding high and low frequency bands and the initial configuration of the internal processing and computing resources for the scheduling of the corresponding service beams based on the prior information of the service situation in the target previous service area in the previous cycle, to ensure the availability of service beams.

[0079] The baseband processing unit determines the quantity-related information of the terminals accessing under different control beams according to the control beam to which the terminal access indicated by the access information belongs. Among them, the quantity-related information includes at least one of the following: the quantity of terminals (the quantity of terminals of different frequency band types); the quantity of Cell-Radio Network Temporary Identifiers (C-RNTIs); the quantity of random numbers. Specifically, during the polling process of the control beams corresponding to different compliant frequency bands, the terminals perform random access through the control beams, and the baseband processing unit counts the number of accessed users of the terminals in different coverage areas (or different beam positions) based on the SSB index (index) corresponding to the control beams of different frequency bands. The statistical methods can include at least one of the following: the baseband processing unit directly counts the quantity of terminals of different frequency band types, the baseband processing unit counts the terminals according to the quantity of C-RNTIs assigned to the control beams corresponding to the SSB index of different frequency bands, and the baseband processing unit counts according to the quantity of random numbers assigned to the control beams corresponding to the SSB index of different frequency bands.

[0080] The baseband processing unit adjusts the configuration quantity of the service beams corresponding to the control beam and the scheduling resources of the service beams according to the first information. The first information includes at least one of the following: the quantity-related information, the initial configuration quantity, and the service prior information.

[0081] Furthermore, the baseband processing unit adjusts the configuration quantity of the service beams corresponding to the control beam and the scheduling resources of the service beams according to the first information, including at least one of the following:

[0082] If the baseband processing unit determines that the number of terminals accessing under the target control beam is greater than or equal to the initial configured number of service beams corresponding to the target control beam, it adjusts the configured number of service beams and the scheduled configured resources corresponding to the target control beam according to the number of the accessed terminals. The target control beam is any one of the control beams. Specifically, if the number of terminals (such as terminals assigned with C-RNTI) under the target control beam within a certain compliant frequency band is greater than or equal to the number of service beams configured for the current compliant frequency band, it indicates that the number of currently available service beams (the initial number configuration of service beams) is insufficient. The baseband processing unit needs to further allocate additional service beams and corresponding internal processing and computing resources for this frequency band according to the number of terminals assigned with C-RNTI. Otherwise, no further adjustment is required.

[0083] If the baseband processing unit determines that the first number corresponding to the target control beam is greater than or equal to the second number corresponding to the service beam of the target control beam in the prior information, it adjusts the configured number of service beams and the scheduled configured resources corresponding to the target control beam according to the processing capacity of the baseband processing unit and the first number. The target control beam is any one of the control beams; the first number includes at least one of the following: the number of C-RNTI, the number of random numbers; the second number includes at least one of the following: the number of terminals, the number of radio resource control (RRC) connections. Specifically, if the number of C-RNTI or random numbers assigned under the control beam (i.e., the target control beam) corresponding to a certain SSB index within a certain frequency band is greater than or equal to the information such as the number of terminals and the number of RRC connections included in the prior information, it indicates that the available baseband processing resources of the service beams in the subsequent target service area will be insufficient. The baseband processing unit needs to further schedule additional service beams to re-cover this area based on its own processing capacity and the number of C-RNTI or random numbers assigned under this control beam, and at the same time allocate the corresponding additional internal processing and computing resources required. Otherwise, no further adjustment is required.

[0084] The following combines Figure 2 , to illustrate the specific working process of the satellite payload system when there is only a single frequency band type of terminal in the target service area:

[0085] Considering that local regulations in different regions have certain restrictions and differences on frequency use, there is a situation where a single satellite's frequency use is non-compliant in a certain region and it cannot land and carry out communication services. This situation will cause the satellite to only be able to use a certain frequency band to carry out services in the current region.

[0086] Based on this, for the case where there is only a single type of terminal in a certain service area, the baseband processing unit makes a decision according to the ephemeris information of the target satellite and the direction angle of the antenna-projecting service beam, and combines the frequency regulations in the area where the current beam points. The radio frequency unit corresponding to the frequency band (compliant frequency band) that complies with the frequency regulations and the corresponding parameter set are adopted on the corresponding beam. The specific process is as follows:

[0087] The baseband processing unit pre-sets the ephemeris information of the current satellite, calculates the relative position relationship between the current satellite's orbit and the ground service area according to the ephemeris information, and then judges the relative position between the target satellite and the target service area, and determines the compliant frequency band of the target service area.

[0088] The target satellite measures the current satellite attitude-related parameters by itself and sends them to the baseband processing unit. The baseband processing unit judges whether the current target service area is within the service range that the target satellite can provide based on information such as satellite attitude, satellite field of view angle, and orbital altitude (i.e., satellite attitude-related parameters). If it is not within the service range that the satellite can provide, wait for the next judgment opportunity. If it is within the service range that the target satellite can provide, calculate the beam direction angle corresponding to the service beam provided in combination with the width of the service beam projected by the antenna in the corresponding frequency band. There can be multiple beam direction angles corresponding to the beam.

[0089] The baseband processing unit adopts a parameter set adapted to this frequency band according to the corresponding frequency band, and transmits the calculated beam direction angle to the corresponding beam control unit through the radio frequency unit corresponding to this frequency band, for adjusting the direction of the service beam projected by the antenna to provide communication services for the terminals in the current area. In this case, the terminal access method has nothing to do with whether the beam jumps.

[0090] During the movement of the satellite, the baseband processing unit repeats the above calculation process according to the beam direction angle adjustment period of the antenna and in combination with the ephemeris information to ensure the communication service in this area, that is, calculate and adjust the pointing of the satellite antenna and subsequent mobility management based on the moving trajectory of the target satellite.

[0091] The following combines Figure 3 , to illustrate the specific working process of the satellite payload system when there are only multiple frequency band types of terminals in the target service area:

[0092] Based on the local frequency regulations in the current service area, there are two types of terminals, VSAT and handheld terminals, in the services that can be landed in the current area. At this time, to ensure that different types of terminals can identify the corresponding frequency band network and access successfully, it is necessary to ensure the availability of high- and low-frequency satellite-borne equipment at the same time. In this case, the baseband processing unit needs to perform internal calculations and coordinated scheduling of processing resources according to the user situation in the two frequency bands.

[0093] Taking a phased array antenna as a satellite antenna as an example, considering that the wave positions are fixed on the ground and the phased array antennas all project staring beams, assuming that the available bandwidth resources in the high and low frequency bands are sufficient in the current area, the baseband processing unit performs preliminary internal processing and computing resource allocation for the corresponding high and low frequency bands based on the prior information of the user distribution in the target service area in the previous orbit cycle, and then the baseband processing unit makes a decision according to the ephemeris information and the beam projection capabilities of the phased array antennas corresponding to the two frequency bands, and uses a parameter set adapted to the corresponding frequency band to perform corresponding SSB transmission on the corresponding polling control beam. Different types of terminals search for the SSB that can be adapted to them by themselves, and complete subsequent access based on the service beam scheduled corresponding to the corresponding SSB. The baseband processing unit performs further internal processing and dynamic and flexible allocation of computing resources according to the access terminal situation. The specific process is as follows:

[0094] The baseband processing unit pre-sets the ephemeris information of the current satellite, calculates the relative position relationship between the current satellite's orbit and the ground service area according to the ephemeris information, and then judges the relative position between the target satellite and the target service area, and determines the compliant frequency bands of the target service area.

[0095] The target satellite measures the relevant parameters of the current satellite attitude by itself and sends them to the baseband processing unit. The baseband processing unit judges whether the current target service area is within the service range that the target satellite can provide based on information such as satellite attitude, satellite field of view angle, and orbital altitude (i.e., satellite attitude-related parameters). If it is not within the service range that the satellite can provide, wait for the next judgment opportunity. If it is within the service range that the target satellite can provide, calculate the beam direction angle corresponding to the service beam provided in combination with the width of the service beam projected by the antenna in the corresponding frequency band. There can be multiple direction angles corresponding to the beam.

[0096] The baseband processing unit adopts a parameter set adapted to this frequency band according to the corresponding frequency band, and transmits the beam direction angle calculated above to the corresponding wave control unit through the radio frequency unit corresponding to this frequency band, for adjusting the direction of the service beam projected by the antenna and providing communication services for the terminals in the current area.

[0097] The baseband processing unit controls the corresponding phased array antennas to project control beams carrying SSBs using parameter sets adapted to the corresponding parameters through two radio frequency units respectively. The control beams need to poll all wave positions in the current coverage range according to a certain hopping rule, and the service beams are projected as needed.

[0098] The number of SSBs sent by the baseband processing unit corresponds to the parameter set it uses. Since the number of SSBs configured for the high frequency band and the low frequency band is different, in order to ensure the polling efficiency of the control beam, the number of phased array antenna control beams in different frequency bands should be the same as the number of SSBs in the corresponding configuration.

[0099] Before on-demand scheduling of service beams, the baseband processing unit configures the number of service beams in the corresponding high and low frequency bands and configures the internal processing and computing resources for the corresponding service beam scheduling based on the prior information on the service conditions in the target service area during the previous cycle, ensuring the availability of service beams. The service conditions in the target service area during the previous cycle can be stored in the ground control center or the satellite payload system. The content included in the prior information includes, but is not limited to, the number of users of different types of terminals in the target service area, the distribution density, the RRC connection duration, and other information.

[0100] Different types of terminals search for the control beams carrying SSB by themselves. When the control beam in the corresponding frequency band jumps to its position, the terminal can receive the corresponding SSB and perform random access on the corresponding control beam.

[0101] The baseband processing unit of the on-board equipment schedules and further configures the corresponding service beams according to the access user information transmitted by the radio frequency units in different frequency bands, for subsequent user services, further dynamic allocation of internal processing and computing resources in the baseband processing unit. This process is not perceived by the terminal, that is, the pointing of the phased array antenna is calculated and adjusted based on the movement trajectory of the target satellite, namely subsequent mobility management.

[0102] The scheduling of service beams requires the processing and computing resources of the baseband processing unit. Since the processing capacity of the baseband processing unit is limited, on-demand unified scheduling of service beams in the corresponding frequency band can serve more users on the premise that the processing capacity of the baseband processing unit is within the range and the bandwidth resources are sufficient, and also realize the dynamic allocation of internal computing resources in the baseband processing unit. Therefore, the baseband processing unit can further configure, schedule and re-cover the service beams according to the number of concurrent users accessing under a single control beam (for example, counting through C-RNTI or random numbers), and further dynamically allocate the internal processing and computing resources, improving the resource utilization rate and ensuring the overall service performance of the system. The process of dynamic allocation can be carried out periodically or event-triggered during the movement of the satellite to ensure the maximization of resource utilization.

[0103] Specifically, assume that the number of control beams in the low-frequency band and the high-frequency band respectively matches the number of SSBs in the corresponding frequency band, and the available spectrum resources for service beams are sufficient. Before covering the target service area, the baseband processing unit configures the number of service beams in the corresponding high- and low-frequency bands and allocates the internal processing and computing resources for the corresponding service beam scheduling according to the prior information on the service situation in the target service area in the previous cycle. Assume that there are relatively few handheld terminal users and VSAT terminal users in the previous cycle. The baseband processing unit configures a small number of service beams and corresponding internal processing resources for the low-frequency band and the high-frequency band according to the prior information. The remaining available beams, spectrum resources in each frequency band, and the internal computing resources of the baseband processing unit are all sufficient. During the polling process of the control beams corresponding to each frequency band, the terminal performs random access through the control beam, and the baseband processing unit of the on-board device counts the number of terminal access users in different coverage areas (or different beam positions) based on the SSB index corresponding to the control beam in different frequency bands. The counting method can be that the baseband processing unit counts according to the number of C-RNTIs or the number of random numbers under the control beam corresponding to the SSB index allocated to different frequency bands. The baseband processing unit compares the counting information of the corresponding beam position with the prior information. If: the number of control beams of the UE with the allocated C-RNTI in a certain frequency band is greater than or equal to the number of service beams configured for the current frequency band, it means that the current available service beam number is insufficient, and the baseband processing unit of the on-board device needs to further allocate additional service beams and corresponding internal processing and computing resources for this frequency band according to the number of control beams of the UE with the allocated C-RNTI, otherwise no further adjustment is required; if the number of allocated C-RNTIs or random numbers under the coverage of the control beam corresponding to a certain SSB index in a certain frequency band is greater than or equal to the information such as the number of users and the number of RRC connections included in the prior information, it means that the available baseband processing resources of the service beam in the current area will be insufficient in the future. The baseband processing unit of the on-board device needs to further schedule additional service beams to re-cover this area based on its own processing ability and the number of allocated C-RNTIs or random numbers under the coverage of this control beam, and at the same time allocate the corresponding additional internal processing and computing resources required, otherwise no further adjustment is required. During the movement of the satellite, the above process is repeated according to the actual distribution of users for the dynamic allocation of baseband processing resources.

[0104] As Figure 4 shown, an embodiment of the present invention further provides an on-board processing method, which is applied to the satellite payload system described in any one of the above, and the method includes:

[0105] Step 401: Obtain the terminal type and compliant frequency band of the terminals in the target service area of the target satellite;

[0106] Step 402: Determine the target parameters adapted to the compliant frequency band according to the terminal type and the compliant frequency band;

[0107] Step 403: Determine the beam direction angle of the beam projected by the satellite antenna corresponding to the compliant frequency band; wherein, the target parameter and the beam direction angle are used for the terminal to communicate with the target satellite in the target service area.

[0108] Optionally, the method further includes:

[0109] Determine the relative position between the satellite operation trajectory of the target satellite and the target service area according to the ephemeris information of the target satellite.

[0110] Optionally, the method further includes:

[0111] Obtain the satellite attitude related parameters of the target satellite;

[0112] Determine whether the target satellite can provide services in the target service area according to the satellite attitude related parameters.

[0113] Optionally, the method further includes:

[0114] Adjust the direction of the service beam projected by the satellite antenna according to the beam direction angle, and the terminal communicates with the target satellite in the direction of the service beam.

[0115] Optionally, in the case that there are at least two types of frequency band terminals in the target service area, the method further includes:

[0116] Control the satellite antennas corresponding to the compliant frequency bands of different types of frequency band terminals to project control beams respectively through the radio frequency units corresponding to the different types of frequency band terminals, and the control beams carry the synchronization signal block SSB corresponding to the target parameter;

[0117] When the terminal receives the SSB and accesses the corresponding control beam according to the SSB, obtain the access information of the terminal sent by the radio frequency unit;

[0118] Configure service beams for the terminal according to the access information.

[0119] Optionally, configuring service beams for the terminal according to the access information includes:

[0120] Obtain the service prior information of the target service area in the previous satellite orbit period;

[0121] Determine the initial configuration quantity and initial scheduling resources of different service beams according to the service prior information; wherein, the different service beams correspond to different compliant frequency bands;

[0122] Determine the quantity-related information of the terminals accessing under different control beams according to the control beam accessed by the terminal indicated by the access information;

[0123] Adjust the configured quantity of the service beam corresponding to the control beam and the scheduling resources of the service beam according to the first information, where the first information includes at least one of the following: the quantity-related information, the initial configured quantity, and the service prior information.

[0124] Optionally, the quantity-related information includes at least one of the following:

[0125] The quantity of terminals;

[0126] The quantity of cell temporary user identifiers C-RNTI;

[0127] The quantity of random numbers.

[0128] Optionally, adjusting the configured quantity of the service beam corresponding to the control beam and the scheduling resources of the service beam according to the first information includes at least one of the following:

[0129] If it is determined that the quantity of terminals accessing under the target control beam is greater than or equal to the initial configured quantity of the service beam corresponding to the target control beam, adjust the configured quantity of the service beam corresponding to the target control beam and the scheduling configured resources according to the quantity of the accessed terminals;

[0130] If it is determined that the first quantity corresponding to the target control beam is greater than or equal to the second quantity corresponding to the service beam of the target control beam in the prior information, adjust the configured quantity of the service beam corresponding to the target control beam and the scheduling configured resources according to the processing capacity of the baseband processing unit and the first quantity;

[0131] Wherein, the target control beam is any one of the control beams;

[0132] The first quantity includes at least one of the following: the quantity of C-RNTI, the quantity of random numbers;

[0133] The second quantity includes at least one of the following: the quantity of terminals, the number of radio resource control RRC connections.

[0134] It should be noted that the on-board processing method provided in the embodiments of the present invention is a method executed by the above satellite payload system, and all embodiments of the above satellite payload system are applicable to this method and can achieve the same or similar technical effects.

[0135] It should be noted that in each embodiment of the present invention, each functional unit may be integrated into a processing unit, or each unit may be physically separate, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0136] The above are the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A satellite payload system, characterized in that, it includes: a baseband processing unit; The baseband processing unit is used to obtain the terminal type and compliant frequency band of terminals within the target service area of the target satellite; The baseband processing unit is used to determine the target parameters adapted to the compliant frequency band according to the terminal type and the compliant frequency band, and to determine the beam direction angle of the beam projected by the satellite antenna corresponding to the compliant frequency band; wherein, the target parameters and the beam direction angle are used for communication between the terminal and the target satellite within the target service area.

2. The satellite payload system according to claim 1, characterized in that, the baseband processing unit is further used for: determining the relative position between the satellite operation trajectory of the target satellite and the target service area according to the ephemeris information of the target satellite.

3. The satellite payload system according to claim 1, characterized in that, the baseband processing unit is further used for: obtaining the satellite attitude related parameters of the target satellite; determining whether the target satellite can provide services within the target service area according to the satellite attitude related parameters.

4. The satellite payload system according to claim 1, characterized in that, the satellite payload system further includes a radio frequency unit and a beam control unit; the baseband processing unit is further used for sending the beam direction angle to the radio frequency unit; the radio frequency unit is used for sending the beam direction angle to the beam control unit; the beam control unit is used for adjusting the direction of the service beam projected by the satellite antenna according to the beam direction angle, and the terminal communicates with the target satellite in the direction of the service beam.

5. The satellite payload system according to claim 4, characterized in that, the terminal type includes at least one frequency band type, and the compliant frequency bands corresponding to terminals of different frequency band types are different; the radio frequency units and beam control units corresponding to terminals of different frequency band types are different.

6. The satellite payload system according to claim 1, characterized in that, when there are at least two frequency band types of terminals within the target service area, the baseband processing unit is further used for: controlling the satellite antennas projecting control beams corresponding to the respective compliant frequency bands through the radio frequency units corresponding to the terminals of different frequency band types, and the control beams carry the synchronization signal block SSB corresponding to the target parameters; when the terminal receives the SSB and accesses the corresponding control beam according to the SSB, obtaining the access information of the terminal sent by the radio frequency unit; configuring a service beam for the terminal according to the access information.

7. The satellite payload system according to claim 6, characterized in that, the baseband processing unit configuring a service beam for the terminal according to the access information includes: the baseband processing unit obtaining the service prior information of the target service area in the previous satellite orbit period; the baseband processing unit determining the initial configuration quantity and initial scheduling resources of different service beams according to the service prior information; wherein, the different service beams correspond to different compliant frequency bands; The baseband processing unit determines information related to the number of terminals accessing under different control beams according to the control beam to which the terminal access indicated by the access information; The baseband processing unit adjusts the configured number of service beams corresponding to the control beam and the scheduling resources of the service beams according to the first information, where the first information includes at least one of the following: the information related to the number, the initial configured number, and the service prior information.

8. The satellite payload system according to claim 7, characterized in that The information related to the number includes at least one of the following: The number of terminals; The number of cell temporary user identifiers C-RNTI; The number of random numbers.

9. The satellite payload system according to claim 7, characterized in that The baseband processing unit adjusts the configured number of service beams corresponding to the control beam and the scheduling resources of the service beams according to the first information, including at least one of the following: If the baseband processing unit determines that the number of terminals accessing under the target control beam is greater than or equal to the initial configured number of the service beam corresponding to the target control beam, it adjusts the configured number of the service beam corresponding to the target control beam and the scheduling configuration resources according to the number of the accessing terminals; If the baseband processing unit determines that the first number corresponding to the target control beam is greater than or equal to the second number corresponding to the service beam of the target control beam in the prior information, it adjusts the configured number of the service beam corresponding to the target control beam and the scheduling configuration resources according to the processing capability of the baseband processing unit and the first number; wherein, the target control beam is any beam in the control beams; The first number includes at least one of the following: the number of C-RNTI, the number of random numbers; The second number includes at least one of the following: the number of terminals, the number of radio resource control (RRC) connections.

10. An on-board processing method, characterized in that applied to the satellite payload system according to any one of claims 1 to 9, the method includes: Obtaining the terminal type and the compliant frequency band of the terminals in the target service area of the target satellite; Determining the target parameters adapted to the compliant frequency band according to the terminal type and the compliant frequency band; Determining the beam direction angle of the beam according to the width of the beam projected by the satellite antenna corresponding to the compliant frequency band; wherein, the target parameters and the beam direction angle are used for the terminals to communicate with the target satellite in the target service area.

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