A "graceful access" satellite communication method based on phased array beam steering

Abstract

The application provides a kind of " as-encountered access " satellite communication method based on phased array agile beam, and the working mode of communication between satellite and terminal is divided into two scenarios: scene one, terminal is under global signaling beam and enters network and resource application, on-board scheduling phased array agile beam is directed to the terminal, terminal is under phased array agile beam, and completes service communication;Scene two, terminal is under signaling enhancement beam and enters network, on-board scheduling phased array agile beam is directed to the terminal, terminal is under phased array agile beam, and completes resource application and service communication.The application uses " global signaling beam + phased array agile beam " fusion " as-encountered access " satellite communication method, has the advantages of global signaling beam and phased array agile beam, has the characteristics of beam wide area coverage, resource dynamic configurable, service communication EIRP and G / T value is high, supports terminal to carry out " network authentication " under global signaling beam, " service communication " under phased array agile beam, improves the communication rate and user experience of small terminal.

Description

Technical Field

[0001] This invention belongs to the field of satellite communication technology and relates to "on-demand access" satellite communication, specifically to an "on-demand access" satellite communication method based on phased array agile beams. Background Technology

[0002] With the continuous development of satellite communication technology, the demands for terminal access and service communication are also constantly increasing. Traditional "on-demand access" satellite communication systems mostly adopt two technical paths: one is to use global signaling beams for wide-area coverage; the other is to use digital multi-beams for cell coverage on the ground, with each cell using a different narrow beam. Currently, there is no system that integrates global signaling beams and phased array agile beams. Therefore, there is an urgent need to efficiently meet the communication needs of small terminals for network access and use, improve the convenience of network access and service communication speed, and obtain a good user experience. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a "random access" satellite communication method based on phased array agile beams, thereby solving the technical problem in existing satellite communication methods where small terminals struggle to balance the convenience of network access with the service communication rate.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A "random access" satellite communication method based on phased array agile beams, wherein the satellite is equipped with a global antenna, and the global antenna communicates through a global signaling beam.

[0006] The satellite is also equipped with a phased array antenna, which communicates via a phased array agile beam; the phased array agile beam includes a signaling enhancement beam.

[0007] The communication between the satellite and the terminal operates in two scenarios:

[0008] Scenario 1: The terminal accesses the network and requests resources under the global signaling beam. The satellite's scheduling phased array agile beam is pointed at the terminal, and the terminal completes service communication under the phased array agile beam.

[0009] Scenario 2: The terminal enters the network under the signaling enhancement beam, and the satellite scheduling phased array agile beam points to the terminal. Under the phased array agile beam, the terminal completes resource application and service communication.

[0010] The present invention also has the following technical features:

[0011] Specifically, the method includes the following steps:

[0012] Step one, wave position division:

[0013] Wave position division is performed on the ground coverage area of the satellite, each wave position is numbered, and the center point position is recorded to form a wave position record table.

[0014] The wave position division includes wave position division of the ground coverage area of the phased array agile beam and wave position division of the ground coverage area of the phased array signaling enhancement beam.

[0015] Step two, hopping rule design:

[0016] The phased array agile beam is divided into an uplink phased array agile beam and a downlink phased array agile beam, and the hopping rule of the phased array agile beam includes an uplink phased array agile beam hopping rule and a downlink phased array agile beam hopping rule.

[0017] Step three, network entry:

[0018] Step 301, when using a global signaling beam, the terminal completes network entry and packet access under the global signaling beam, and the satellite-borne network controller allocates corresponding spatial wave position resources and uplink and downlink time domain channel resources to the terminal under the phased array agile beam.

[0019] Step 302, when using a signaling enhancement beam, the terminal only completes network entry access under the signaling enhancement beam, and the satellite-borne network controller allocates corresponding spatial wave position resources and synchronization control channel resources to the terminal under the phased array agile beam.

[0020] Step four, synchronization and service communication:

[0021] Step 401, when using a global signaling beam, the terminal completes uplink and downlink TDMA synchronization and develops service communication under the phased array agile beam.

[0022] Step 402, when using a signaling enhancement beam, packet access, uplink and downlink TDMA synchronization, and service communication are completed under the phased array agile beam.

[0023] Step five, network exit:

[0024] After the terminal completes service communication, network exit is completed under the phased array agile beam.

[0025] In step one, preferably, the ground coverage area of the phased array agile beam is divided into 1069 wave positions; and the phased array signaling enhancement beam is divided into 61 wave positions.

[0026] In step two, preferably, the uplink phased array agile beam hopping rule is:

[0027] 1 uplink phased array beam supports 8 wave position coverage scheduling, the uplink phased array beam is scheduled and managed according to frame and 2 complex frames, and the scheduling period is defined as 1 frame length.

[0028] 1 synchronization time slice, 4 common control time slices and 28 service time slices are divided in one scheduling period;The synchronization time slice is managed according to 16 scheduling periods;The synchronization time slice is specially used for synchronization channel, and the terminal uses it by competition;The service time slice is managed according to 1 scheduling period, and the service time slice is allocated and used by satellite network control.

[0029] In step two, preferably, the downlink phased array beam hopping rule is:

[0030] 1 downlink phased array beam can correspond to 1-2 phased array receiving beams, and the downlink phased array beam can support the coverage scheduling of 16 wave positions at most;The downlink phased array beam is scheduled and managed according to frame, 2 complex frames and 16 complex frames, and the scheduling period is defined as 1 frame length.

[0031] 4 synchronization and state time slices, 26 service time slices and 2 broadcast control time slices are divided in one scheduling period;The synchronization and state time slice is managed according to 16 scheduling periods;The synchronization and state time slice is divided into synchronization channel and state channel, and the terminal uses it by sharing;The service time slice is managed according to 1 scheduling period;The service time slice is divided into downlink broadcast control channel and downlink service channel;The downlink broadcast control channel is managed according to 16 complex frame periods, and each wave position stays for 1 complex frame period;The downlink service channel is scheduled and used by data driving.

[0032] In step 301, preferably, the allocation process of the spatial wave position resource and the uplink and downlink time domain channel resource includes the scheduling of the uplink phased array beam and the scheduling of the downlink phased array beam.

[0033] The scheduling of the uplink phased array beam is driven by the resource allocation result, the terminal with the most allocated time slice in the wave position is determined as the residence time of the beam in the wave position, and the other time slice resources of the wave position can only be allocated to the terminal located below the wave position.

[0034] The scheduling of the downlink phased array beam is driven by downlink service data, the downlink phased array beam has only one carrier, and the beam resource can only be used by one terminal at the same time, that is, there is no frequency multiplexing, the direction of all downlink phased array beams only needs to check which wave position the terminal using the resource is in, and the phased array beam is controlled to point to the wave position of the terminal according to the time slot resource allocation result.

[0035] In step 302, preferably, the terminal completes network access and packet access under the phased array signaling enhanced beam, the phased array signaling enhanced beam covers 61 wave positions through periodic scanning mode, the terminal reports the network access application, packet access and position or wave position information to the satellite through the phased array signaling enhanced beam at the appointed time, the satellite-borne network control allocates corresponding spatial wave position resources and time domain channel resources to the terminal under the phased array fast beam according to the position information or wave position number reported at the time of network access, and carries out business communication under the phased array fast beam.

[0036] When the global signaling beam and the phased array fast beam are used to carry out the satellite communication of the on-demand access, the satellite-borne network control allocates the spatial wave position resources and the time domain channel resources to the terminal under the phased array fast beam, and the specific features are as follows: the fast beam contains the time dimension and the space dimension, the management of the fast beam includes the resource allocation and the wave position hopping control, and the latter is driven by the result of the former.

[0037] The scheduling of the uplink phased array fast beam is driven by the resource allocation result, the terminal with the most time slice allocation in the wave position is used to determine the residence time of the beam in the wave position, and the other time slice resources of the wave position can only be allocated to the terminal located in the wave position.

[0038] The scheduling of the downlink phased array fast beam is driven by the downlink business data, the downlink phased array fast beam has only one carrier, the beam resources can only be used by one terminal at the same time, that is, there is no frequency multiplexing, and the direction of all the downlink phased array fast beams only needs to check the wave position of the terminal using the resources, and the direction of the fast beam is controlled according to the time slot resource allocation result.

[0039] In step 401, preferably, the uplink and downlink TDMA synchronization process is as follows: the terminal completes the uplink and downlink TDMA synchronization under the global signaling beam, and switches to the phased array fast beam to keep the TDMA synchronization, and if the TDMA synchronization keeping is out of step, the uplink and downlink TDMA synchronization is re-performed under the phased array fast beam.

[0040] In step 401, further preferably, in the uplink and downlink TDMA synchronization process, the TOD time is used as the unified time reference.

[0041] In step 402, preferably, the uplink and downlink TDMA synchronization process is as follows: the terminal completes the uplink and downlink TDMA synchronization under the signaling enhanced beam, and switches to the phased array fast beam to keep the TDMA synchronization, and if the TDMA synchronization keeping is out of step, the uplink and downlink TDMA synchronization is re-performed under the phased array fast beam.

[0042] Compared with the prior art, the application has the following technical effects:

[0043] (I) The application adopts a "global signaling beam + phased array agile beam" fusion "on-demand access" satellite communication method, which has the advantages of global signaling beam and phased array agile beam, has the characteristics of wide coverage of beam, dynamic configuration of resources, high EIRP and G / T value of business communication, supports terminal "network authentication" under global signaling beam, and "business communication" under phased array agile beam, improves the communication rate and user experience of small terminal.

[0044] (II) The application proposes a "on-demand access" satellite communication method based on phased array agile beam, which has the characteristics of wide coverage of beam, dynamic configuration of resources, high EIRP and G / T value of business communication, compared with the traditional global signaling beam access scheme or digital multi-beam access scheme. Support terminal "network authentication" under global signaling beam, and "business communication" under phased array agile beam, improve the communication rate and user experience of small terminal.

[0045] (III) The application proposes a resource allocation technology based on space-time domain hybrid architecture, which unifies space and time domain for resource management and allocation. The traditional resource allocation technology only manages the space domain resource or the time domain resource. The time domain resource is divided into synchronization channel, public control channel, state channel, broadcast channel and service channel. Different time domain resources adopt different space domain wave position hopping rules to realize accurate matching and control of space domain resource and time domain resource. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The use flowchart of the "on-demand access" satellite communication method based on phased array agile beam of the application is shown.

[0047] Figure 2 The wave position division diagram of the phased array agile beam coverage area of the application is shown.

[0048] Figure 3 The wave position division diagram of the signaling enhanced beam coverage area of the application is shown.

[0049] Figure 4 The uplink synchronization and public control channel wave position hopping diagram of the uplink phased array agile beam of the application is shown.

[0050] Figure 5 The downlink synchronization and state channel wave position hopping diagram of the downlink phased array agile beam of the application is shown.

[0051] Figure 6 The resource allocation flowchart of the phased array agile beam to the terminal of the application is shown.

[0052] Figure 7 The TDMA synchronization flowchart of the "global signaling beam + phased array agile beam" of the application is shown.

[0053] The specific content of the present application is further explained in detail in connection with the following examples. DETAILED DESCRIPTION

[0054] It should be noted that all the devices and technologies in the present application, if not specifically stated, all use the devices and technologies known in the prior art.

[0055] The current satellite communication system cannot well balance the application requirements of global ''on-demand access'' and regional ''high-speed service communication'', and there is no system that uses global signaling beams and phased array agile beams in combination. The present application proposes a ''on-demand access'' satellite communication method combining ''global signaling beams + phased array agile beams'', which is different from the traditional global signaling beam access scheme or digital multi-beam access scheme. The present application has the advantages of global signaling beams and phased array agile beams, and has the characteristics of wide beam coverage, dynamic resource configuration, high EIRP and G / T value of service communication, etc. It supports the terminal to perform ''network authentication'' under the global signaling beam and ''service communication'' under the phased array agile beam, thereby improving the communication rate and user experience of small terminals.

[0056] The specific embodiments of the present application are given below. It should be noted that the present application is not limited to the following specific embodiments, and any equivalent transformation made on the basis of the technical scheme of the present application falls within the protection scope of the present application.

[0057] Embodiment:

[0058] The present embodiment gives a ''on-demand access'' satellite communication method based on phased array agile beams. A global antenna is arranged in the satellite, and the global antenna communicates through a global signaling beam.

[0059] A phased array antenna is also arranged in the satellite, and the phased array antenna communicates through a phased array agile beam and a signaling enhancement beam.

[0060] In the present embodiment, specifically, the phased array agile beam is used to ensure that the terminal can complete ''service communication'' under the coverage area of the satellite, and the phased array signaling enhancement beam is used to support the terminal to complete ''on-demand access'' under the coverage area of the satellite.

[0061] Further, the working mode of communication between the satellite and the terminal is divided into two scenarios:

[0062] Scenario one: the terminal performs network access and resource application under the global signaling beam, the satellite schedules the phased array agile beam to point to the terminal, and the terminal completes service communication under the phased array agile beam.

[0063] Scenario two: the terminal performs network access under the signaling enhancement beam, the satellite schedules the phased array agile beam to point to the terminal, and the terminal completes resource application and service communication under the phased array agile beam.

[0064] Specifically, as shown in Figure 1 the method comprises the following steps:

[0065] Step one, wave position division:

[0066] The wave position division is performed on the ground coverage area of the satellite, each wave position is numbered, and the center point position is recorded to form a wave position record table; so as to be queried and directed by the phased array antenna.

[0067] The wave position division includes wave position division of the ground coverage area of the phased array agile beam and wave position division of the ground coverage area of the phased array signaling enhanced beam.

[0068] In this embodiment, as shown in Figure 2 the ground coverage area of the phased array agile beam is divided into 1069 wave positions, and each wave position is numbered and the center point position is recorded. During the network access and use process of the terminal, only the wave position number of the terminal needs to be reported, and the corresponding space and time domain resources are allocated by the satellite network control to direct the terminal.

[0069] In this embodiment, the phased array signaling enhanced beam only receives uplink, and the wave position division of the ground coverage area of the phased array signaling enhanced beam is also needed. As shown in Figure 3 the phased array signaling enhanced beam is divided into 61 wave positions.

[0070] Step two, hopping rule design:

[0071] The phased array agile beam is divided into uplink phased array agile beam and downlink phased array agile beam, and the hopping rule of the phased array agile beam includes the hopping rule of the uplink phased array agile beam and the hopping rule of the downlink phased array agile beam.

[0072] In this embodiment, specifically, as shown in Figure 4 the hopping rule of the uplink phased array agile beam involves the uplink synchronization channel, the uplink common control channel and the uplink service channel; the hopping rule of the uplink phased array agile beam is that 1 uplink phased array agile beam supports 8 wave position coverage scheduling, the uplink phased array agile beam is scheduled and managed according to a frame (1 frame duration, service) and 2 complex frames (2 complex frame durations, synchronization and common control signaling), and a scheduling period is defined as 1 frame duration.

[0073] 1 synchronization time slice, 4 common control time slices and 28 service time slices are divided in one scheduling period; the synchronization time slice is managed according to 16 scheduling periods. The synchronization time slice is specially for the synchronization channel, and the terminal uses it by competition; the service time slice is managed according to 1 scheduling period, and the service time slice is allocated and used by the satellite network control.

[0074] In this embodiment, the scheduling parameters (one scheduling cycle) of the uplink phased array agile beam are shown in Table 1:

[0075] Table 1. Uplink Phased Array Agile Beam Scheduling Parameters (1 Scheduling Cycle)

[0076]

[0077] Note: The time slice unit corresponds to the minimum dwell time unit of the corresponding beam at the current position.

[0078] In this specific embodiment, such as Figure 5 As shown, the downlink phased array agile beam hopping rules involve the downlink synchronization channel, downlink status channel, downlink broadcast channel, and downlink service channel. The downlink phased array agile beam hopping rules are as follows: one downlink phased array agile beam can correspond to one to two phased array receiving beams, and the downlink phased array agile beam can support coverage scheduling of up to 16 positions. The hopping positions of the downlink phased array agile beam have a fixed correspondence with the uplink phased array agile beam. The downlink phased array agile beam is scheduled and managed according to frames (1 frame duration), 2 multiframes (2 multiframe duration), and 16 multiframes (16 multiframe duration), with the scheduling period defined as 1 frame duration.

[0079] Within a scheduling cycle, there are 4 synchronization and status time slices, 26 service time slices, and 2 broadcast control time slices. The synchronization and status time slices are managed according to 16 scheduling cycles. The synchronization and status time slices are divided into synchronization channels and status channels, which are shared by the terminals. The service time slices are managed according to 1 scheduling cycle. The service time slices are divided into downlink broadcast control channels and downlink service channels. The downlink broadcast control channels are managed according to 16 multiframe cycles, with each frequency bit staying for 1 multiframe cycle. The downlink service channels are scheduled and used using a data-driven method.

[0080] In this embodiment, the scheduling parameters (one scheduling cycle) of the downlink phased array agile beam are shown in Table 2.

[0081] Table 2 Downlink Phased Array Agile Beam Scheduling Parameters (1 Scheduling Cycle)

[0082]

[0083]

[0084] Note: The time slice unit corresponds to the minimum dwell time unit of the corresponding beam at the current position.

[0085] Step 3, Network Access:

[0086] Step 301, when using global signaling beams, the terminal completes network access and packet access under the global signaling beams, and the spaceborne network controller allocates corresponding spatial wave position resources and uplink and downlink time domain channel resources to the terminal under the phased array steerable beams.

[0087] In this embodiment, the characteristic of the steerable beam is to contain both time dimension and space dimension. The management of the steerable beam includes resource allocation and wave position hopping control, and the latter is driven by the result of the former.

[0088] In step 301, as shown in the figure, Figure 6 When using the fusion of global signaling beams and phased array steerable beams to carry out "on-demand access" satellite communication, the allocation process of spatial wave position resources and uplink and downlink time domain channel resources includes the scheduling of uplink phased array steerable beams and the scheduling of downlink phased array steerable beams. The scheduling of uplink phased array steerable beams is different from the scheduling of downlink phased array steerable beams.

[0089] The scheduling of uplink phased array steerable beams is driven by the result of resource allocation. The terminal with the most allocated time slices in a wave position determines the residence time of the beam in the wave position. The other time slice resources in the wave position can only be allocated to the terminal located in the wave position.

[0090] The scheduling of downlink phased array steerable beams is driven by downlink service data. The downlink phased array steerable beam has only one carrier, and the beam resources can only be used by one terminal at the same time, that is, there is no frequency multiplexing. The direction of all downlink phased array steerable beams only needs to check which wave position the terminal using the resources is in, and the steerable beam is controlled to point to the wave position where the terminal is located according to the time slot resource allocation result.

[0091] Step 302, when using signaling enhanced beams, the terminal only completes network access under the signaling enhanced beams, and the spaceborne network controller allocates corresponding spatial wave position resources and synchronization control channel resources to the terminal under the phased array steerable beams.

[0092] In step 302, the terminal completes network access and packet access under the phased array signaling enhanced beams. The phased array signaling enhanced beams cover 61 wave positions through periodic scanning. The terminal reports the network access application, packet access, and position or wave position information to the satellite through the phased array signaling enhanced beams at the agreed time. The spaceborne network controller allocates corresponding spatial wave position resources and time domain channel resources to the terminal under the phased array steerable beams according to the position information or wave position number reported at the time of network access, and carries out business communication under the phased array steerable beams.

[0093] When using global signaling beams and phased array steerable beams to carry out "on-demand access" satellite communication, the spaceborne network controller allocates space resource and time channel resource to the terminal under the phased array steerable beam, and the specific features are as follows: the steerable beam contains time dimension and space dimension, and the management of the steerable beam includes resource allocation and beam hopping control, and the latter is driven by the result of the former.

[0094] The scheduling of the uplink phased array steerable beam is driven by the resource allocation result, and the terminal with the most allocated time slices in the beam is determined as the resident time of the beam in the beam, and the other time slice resources of the beam can only be allocated to the terminal located under the beam.

[0095] The scheduling of the downlink phased array steerable beam is driven by downlink service data, and the downlink phased array steerable beam has only one carrier, and the beam resource can only be used by one terminal at the same time, that is, there is no frequency multiplexing, and the direction of all downlink phased array steerable beams only needs to check which beam the terminal using the resource is located in, and the direction of the steerable beam is controlled according to the time slot resource allocation result.

[0096] Step four, synchronization and service communication:

[0097] Step 401, when using global signaling beams, the terminal completes uplink and downlink TDMA synchronization and carries out service communication under the phased array steerable beam.

[0098] In this embodiment, as shown in Figure 7 When using global signaling beams and phased array steerable beams to carry out "on-demand access" satellite communication, the TDMA (Time Division Multiple Access) synchronization process is switched from "global signaling beams" to "phased array steerable beams". In step 401, the uplink and downlink TDMA synchronization process is as follows: the terminal completes uplink and downlink TDMA synchronization under the global signaling beam, and switches to the phased array steerable beam to maintain TDMA synchronization, and if the TDMA synchronization is out of step, the uplink and downlink TDMA synchronization under the phased array steerable beam is re-performed.

[0099] In step 401, further, in the uplink and downlink TDMA synchronization process, TOD (Time of Day) time is used as a unified time reference. Specifically:

[0100] First, the beam hopping of the phased array uses TOD value as the time reference, and uses TOD edge pulse as the beam switching enable signal, and the time synchronization precision of beam switching and beam forming is as high as 100 ns.

[0101] Second, the time slot channel resources distributed by the satellite network control take TOD value as time reference, the start and end time of time slot channel resources are measured by TOD value, and the spatial transmission of signals takes TOD edge pulse as signal transmission or cutoff time, and the time synchronization accuracy of signal transmission can reach 500ns.

[0102] Third, the satellite-ground uplink and downlink TDMA synchronization takes TOD value as time reference, and the TOD value is one of the inputs of TDMA time sequence generation, and the TOD pulse is the enable type of TDMA switching, and the synchronization error of satellite-ground TDMA synchronization is better than 3.125us, so that the satellite-ground can keep TDMA synchronization state.

[0103] Step 402, when using signaling enhanced beam, packet access, uplink and downlink TDMA synchronization and business communication are completed under phased array beam steering.

[0104] In this embodiment, when using signaling enhanced beam and phased array beam steering to carry out "on-demand access" satellite communication, it is different from using global signaling beam and phased array beam steering. The difference between the two mainly lies in:

[0105] First, the beam type of terminal network access and packet access is different. For the signaling enhanced beam + phased array beam steering scheme, the terminal only completes the network access process under the signaling enhanced beam, and then completes the packet access and business communication under the phased array beam steering.

[0106] Second, the signaling enhanced beam is specific to the uplink, and the signaling enhanced beam divides the ground area covered by the satellite into 61 wave positions, and periodically hops on the 61 wave positions according to a certain rule, so as to realize the effect of "on-demand access" of global signaling beam.

[0107] Third, the G / T value of the signaling enhanced beam is higher than that of the global signaling beam, and the coverage area of the instantaneous beam is narrower, which is more conducive to small terminal network access.

[0108] Fourth, the TDMA synchronization process of "global signaling beam + phased array beam steering" is switched from "global signaling beam" to "phased array beam steering", and the TDMA synchronization process of "signaling enhanced beam + phased array beam steering" is switched from "signaling enhanced beam" to "phased array beam steering", which are different.

[0109] In step 402, the uplink and downlink TDMA synchronization process is as follows: the terminal completes the uplink and downlink TDMA synchronization under the signaling enhanced beam, and switches to the phased array beam steering for TDMA synchronization maintenance. If the TDMA synchronization maintenance is out of synchronization, the terminal will re-perform the uplink and downlink TDMA synchronization under the phased array beam steering.

[0110] Step five, log off:

[0111] After the terminal completes the service communication, the terminal completes the network withdrawal under the phased array agile beam.

[0112] In the embodiment, the specific process of the network withdrawal is that the terminal sends a network withdrawal application on an uplink open control channel, receives a network withdrawal response on a corresponding downlink service channel, and the space resource and the time domain channel resource of the terminal are recycled by the satellite network control, which can be used by other terminals.

[0113] From the above embodiment, compared with the prior art, the application has the advantages of global signaling beam and phased array agile beam, and has the characteristics of wide beam coverage, dynamic resource configuration, high service communication EIRP and G / T value compared with the traditional global signaling beam access scheme or digital multi-beam access scheme. The terminal supports "network authentication" under the global signaling beam and "service communication" under the phased array agile beam, which improves the communication rate and user experience of the small terminal. On the other hand, the resource allocation technology based on space-time domain hybrid architecture is adopted, and the space domain and time domain are uniformly managed and allocated. The traditional resource allocation technology only manages the space domain resource or the time domain resource. The time domain resource is divided into synchronization channel, public control channel, state channel, broadcast channel and service channel, and different time domain resources adopt different space domain wave position hopping rules to realize accurate matching and control of space domain resource and time domain resource.

[0114] From the above embodiment, the method of the application can meet the application requirements of small terminal global "on-demand access" and high-speed service communication, improve the precision of agile beam control and the flexibility of resource allocation, lay a technical foundation for the subsequent development of "on-demand access" satellite communication system, provide a reference scheme, and has a broad market application prospect.

[0115] From the above embodiment, the application adopts a satellite communication mode of "global beam + phased array agile beam", which has the advantages of global beam and phased array agile beam, and has the characteristics of wide beam coverage, dynamic resource configuration, high service communication EIRP and GT value. The global antenna has a wide global signaling beam for communication, and the phased array antenna has a high gain signaling enhancement beam and multiple phased array agile service beams. That is, the terminal supports "network authentication" under the wide global beam, and also supports "network authentication" under the high gain phased array signaling enhancement beam, and "service communication" under the phased array agile beam, which greatly improves the communication rate and user experience of the small terminal.

Claims

1. A "random access" satellite communication method based on phased array agile beams, characterized in that, The method includes the following steps: Step 1, Wave position division: The satellite's surface coverage area is divided into wave positions, including the wave position division of the phased array agile beam and the wave position division of the phased array signaling enhancement beam. The phased array agile beam is divided into 1069 wave positions; the phased array signaling enhancement beam is divided into 61 wave positions. Each wave position is numbered and the center point position is recorded to form a wave position record table. Step 2, design the transition rules; Step 3, Network Access: Step 301: When using the global signaling beam, the terminal completes network access and packet access under the global signaling beam. The satellite network controller allocates corresponding spatial wavelet resources and uplink and downlink time domain channel resources to the terminal under the phased array agile beam. Step 302: When using the phased array signaling enhancement beam, the terminal only completes network access and packet access under the phased array signaling enhancement beam. The phased array signaling enhancement beam covers 61 positions through periodic scanning. At the agreed time, the terminal reports the network access application, packet access, and location or position information to the satellite through the phased array signaling enhancement beam. The onboard network controller allocates corresponding spatial position resources and temporal channel resources to the terminal under the phased array agile beam based on the location information or position number reported during network access, and carries out service communication under the phased array agile beam. When using the fusion of global signaling beams and phased array agile beams to carry out "on-demand access" satellite communication, the onboard network controller allocates spatial wavelet resources and temporal channel resources to the terminal under the phased array agile beams. Agile beams include both time and space dimensions. The management of agile beams involves two aspects: resource allocation and wavelet jump control, with the latter driven by the result of the former. The scheduling of uplink phased array agile beams is driven by the resource allocation results. The dwell time of the beam in a wave position is determined by the terminal with the most allocated time slices within that wave position. Other time slice resources in that wave position can only be allocated to terminals located in that wave position. The scheduling of downlink phased array agile beams is driven by downlink service data. Each downlink phased array agile beam has only one carrier, and the beam resources can only be used by one terminal at a time. That is, there is no frequency reuse. The direction of all downlink phased array agile beams only needs to be checked to see which wave position the terminal currently using the resources is on. The direction of the agile beams is controlled according to the time slot resource allocation results. Step 4, Synchronization and Business Communication: Step 401: When using global signaling beams, the terminal completes uplink and downlink TDMA synchronization and conducts service communication under phased array agile beams. Step 402: When using signaling enhancement beams, the terminal completes packet access, uplink and downlink TDMA synchronization, and conducts service communication under phased array agile beams; Step 5, disconnect from the network: After completing the service communication, the terminal completes the network decommissioning under the phased array agile beam.

2. The "on-demand access" satellite communication method based on phased array agile beams as described in claim 1, characterized in that, In step two, the phased array agile beam is divided into uplink phased array agile beam and downlink phased array agile beam. The hopping rules of the phased array agile beam include uplink phased array agile beam hopping rules and downlink phased array agile beam hopping rules. The uplink phased array agile beam hopping rule is as follows: One uplink phased array agile beam supports coverage scheduling of 8 beam positions. The uplink phased array agile beam is scheduled and managed according to frames and 2 multiframes, and the scheduling period is defined as 1 frame duration. Within a scheduling cycle, there is one synchronization time slice, four common control time slices, and 28 service time slices. The synchronization time slice is managed according to 16 scheduling cycles. The synchronization time slice specifically refers to the synchronization channel, which is used by the terminal through contention. The service time slice is managed according to one scheduling cycle and is allocated and used through the onboard network control.

3. The "on-demand access" satellite communication method based on phased array agile beams as described in claim 2, characterized in that, In step two, the downlink phased array agile beam hopping rule is as follows: One downlink phased array agile beam can correspond to 1 to 2 phased array receiving beams, and the downlink phased array agile beam can support coverage scheduling of up to 16 Hz. The downlink phased array agile beam is scheduled and managed in frames, 2 multiframes, and 16 multiframes, with the scheduling period defined as 1 frame duration. Within a scheduling cycle, the system is divided into 4 synchronization and status time slices, 26 service time slices, and 2 broadcast control time slices. The synchronization and status time slices are managed according to 16 scheduling cycles. The synchronization and status time slices are divided into synchronization channels and status channels, which are shared by the terminals. The service time slices are managed according to 1 scheduling cycle. The service time slices are divided into downlink broadcast control channels and downlink service channels. The downlink broadcast control channels are managed according to 16 multiframe cycles, with each wavelet staying for 1 multiframe cycle. The downlink service channels are scheduled and used using a data-driven method.

4. The "on-demand access" satellite communication method based on phased array agile beams as described in claim 1, characterized in that, In step 301, the allocation process of spatial wavelet resources and uplink / downlink time-domain channel resources includes the scheduling of uplink phased array agile beams and the scheduling of downlink phased array agile beams. The scheduling of the uplink phased array agile beam is driven by the resource allocation result. The dwell time of the beam in the wave position is determined by the terminal with the most allocated time slices within the wave position. Other time slice resources in the wave position can only be allocated to the terminal located in the wave position. The scheduling of the downlink phased array agile beams is driven by downlink service data. Each downlink phased array agile beam has only one carrier, and the beam resources can only be used by one terminal at a time. That is, there is no frequency reuse. The direction of all downlink phased array agile beams only needs to be checked to see which wave position the terminal currently using the resources is on. The direction of the agile beams is controlled to point to the wave position of the terminal based on the time slot resource allocation results.

5. The "on-demand access" satellite communication method based on phased array agile beams as described in claim 1, characterized in that, In step 401, the uplink and downlink TDMA synchronization process is as follows: the terminal completes uplink and downlink TDMA synchronization under the global signaling beam and switches to the phased array agile beam to maintain TDMA synchronization. If the TDMA synchronization is out of sync, uplink and downlink TDMA synchronization is restarted under the phased array agile beam.

6. The "on-demand access" satellite communication method based on phased array agile beams as described in claim 5, characterized in that, In step 401, during the uplink and downlink TDMA synchronization process, the TOD time is used as a unified time reference.

7. The "on-demand access" satellite communication method based on phased array agile beams as described in claim 1, characterized in that, In step 402, the uplink and downlink TDMA synchronization process is as follows: the terminal completes uplink and downlink TDMA synchronization under the signaling enhancement beam and switches to the phased array agile beam to maintain TDMA synchronization. If the TDMA synchronization fails to keep in sync, uplink and downlink TDMA synchronization is restarted under the phased array agile beam.

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