"Random access" satellite communication method based on phased array agile beam

Abstract

The invention provides a'random access' satellite communication method based on a phased array agile beam, and the working mode of communication between a satellite and a terminal is divided into two scenes: scene 1, the terminal accesses the network and applies resources under a global signaling beam, the phased array agile beam is scheduled on the satellite to point to the terminal, and the terminal performs resource application under the phased array agile beam; service communication is completed; scene 2, the terminal accesses the network under the signaling enhanced 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. According to the invention, a'random access' satellite communication method integrating'global signaling beams and phased array agile beams' is adopted, the advantages of the global signaling beams and the phased array agile beams are integrated, the method has the characteristics of wide-area coverage of beams, dynamic and configurable resources, high service communication EIRP and high G / T value, the terminal is supported to perform'network access authentication 'under the global signaling beams, and the user experience is improved. And service communication is carried out under the phased array agile wave beam, so that the communication rate and the user experience of the small terminal are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of satellite communication, and relates to "anywhere access" satellite communication, and in particular to an "anywhere access" satellite communication method based on a phased array agile beam. Background Art

[0002] With the continuous development of satellite communication technology, the demand for terminal access and business communication is also increasing. Traditional "anywhere access" satellite communication systems mostly use two technical paths: one is to use global signaling beams for wide-area coverage; the other is to use digital multi-beams to cover the ground cells, and each cell uses a different narrow beam for coverage. At present, there is no system that integrates global signaling beams and phased array agile beams. Therefore, how to efficiently meet the communication needs of small terminals to access and use the network, improve the convenience of access and business communication speed, and obtain a good user experience, the demand is very urgent. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a "anywhere access" satellite communication method based on phased array agile beam, so as to solve the technical problem that the satellite communication method in the prior art is difficult to balance the convenience of network access and service communication rate for small terminals.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A "anywhere access" satellite communication method based on phased array agile beams, wherein a global antenna is arranged in the satellite, and the global antenna communicates via a global signaling beam.

[0006] The satellite is also provided 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 working mode of the communication between the satellite and the terminal is divided into two scenarios:

[0008] In scenario one, the terminal accesses the network and applies for resources under the global signaling beam. The satellite dispatches the phased array agile beam to point to the terminal, and the terminal completes service communication under the phased array agile beam.

[0009] In scenario two, the terminal accesses the network under the signaling enhanced beam, and the satellite dispatches the phased array agile beam to point to the terminal. The terminal completes resource application and service communication under the phased array agile beam.

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

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

[0012] Step 1: Wave division:

[0013] The satellite's surface coverage area is divided into wave positions, each wave position is numbered, and the center point position is recorded to form a wave position record table.

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

[0015] Step 2: Jump 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 rules of the phased array agile beam include an uplink phased array agile beam hopping rule and a downlink phased array agile beam hopping rule.

[0017] Step 3: Join the network:

[0018] Step 301, when using a global signaling beam, the terminal completes network access and packet access under the global signaling beam, and the satellite network control 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 the signaling enhanced beam is used, the terminal completes network access only under the signaling enhanced beam, and the satellite network control allocates corresponding spatial beam position resources and synchronization control channel resources to the terminal under the phased array agile beam.

[0020] Step 4: Synchronization and business communication:

[0021] Step 401: When using a global signaling beam, the terminal completes uplink and downlink TDMA synchronization and conducts business communications under the phased array agile beam.

[0022] Step 402, when using the signaling enhanced beam, complete packet access, uplink and downlink TDMA synchronization, and carry out business communications under the phased array agile beam.

[0023] Step 5: Log out:

[0024] After the terminal completes business communication, it exits the network under the phased array agile beam.

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

[0026] In step 2, preferably, the uplink phased array agile beam hopping rule is:

[0027] One uplink phased array agile beam supports eight beam position coverage scheduling. The uplink phased array agile beam is scheduled and managed according to frames and two multi-frames, and the scheduling period is defined as one frame duration.

[0028] In one scheduling cycle, 1 synchronization time slice, 4 public control time slices and 28 service time slices are divided; the synchronization time slice is managed according to 16 scheduling cycles; the synchronization time slice refers specifically to the synchronization channel, and the terminal uses it through competition; the service time slice is managed according to 1 scheduling cycle, and the service time slice is allocated and used through the satellite network control.

[0029] In step 2, preferably, the downlink phased array agile beam hopping rule is:

[0030] One downlink phased array agile beam can correspond to 1 to 2 phased array receiving beams. The downlink phased array agile beam can support coverage scheduling of up to 16 beam positions. The downlink phased array agile beam is scheduled and managed according to frames, 2 multi-frames and 16 multi-frames, and the scheduling period is defined as 1 frame duration.

[0031] In one scheduling cycle, 4 synchronization and status time slices, 26 service time slices and 2 broadcast control time slices are divided; 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 used by terminals in a shared manner; 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 channel is managed according to 16 multi-frame cycles, and each wave position stays for 1 multi-frame cycle; the downlink service channel is scheduled and used in a data-driven manner.

[0032] In step 301, preferably, the process of allocating spatial domain wave position resources and uplink and downlink time domain channel resources includes scheduling of uplink phased array agile beams and scheduling of downlink phased array agile beams.

[0033] The scheduling of the uplink phased array agile beam is driven by the resource allocation result. The terminal with the most allocated time slices in the beam position determines the residence time of the beam in the beam position. The other time slice resources of the beam position can only be allocated to the terminals located in the beam position.

[0034] The scheduling of the downlink phased array agile beam is driven by downlink service data. The downlink phased array agile 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 reuse. The pointing of all downlink phased array agile beams only needs to check which wave position the terminal currently using the resources is in, and control the agile beam to point to the wave position where the terminal is located 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. 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 agreed time. The satellite network control allocates corresponding spatial wave position resources and time domain channel resources to it under the phased array agile beam according to the position information or wave position number reported when entering the network, and carries out business communications under the phased array agile beam.

[0036] When using the fusion of global signaling beam and phased array agile beam to carry out "anywhere access" satellite communication, the onboard network control allocates spatial domain wave resources and time domain channel resources to the terminal under the phased array agile beam. The specific characteristics are: the agile beam includes two aspects: time dimension and space dimension. The management of the agile beam is resource allocation and wave hopping control. The latter is driven by the result of the former.

[0037] The scheduling of the uplink phased array agile beam is driven by the resource allocation result. The terminal with the most allocated time slices in the beam position determines the beam's residence time in the beam position. The other time slice resources of the beam position can only be allocated to the terminals located in the beam position.

[0038] The scheduling of the downlink phased array agile beam is driven by downlink service data. The downlink phased array agile 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 reuse. The pointing of all downlink phased array agile beams only needs to check which wave position the terminal currently using the resources is in, and control the agile beam to point to the wave position where the terminal is located according to the time slot resource allocation result.

[0039] In step 401, preferably, the uplink and downlink TDMA synchronization process is specifically 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 lost, the uplink and downlink TDMA synchronization is performed again under the phased array agile beam.

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

[0041] In step 402, preferably, the uplink and downlink TDMA synchronization process is specifically as follows: the terminal completes the 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 is lost, the uplink and downlink TDMA synchronization is performed again under the phased array agile beam.

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

[0043] (I) The present invention adopts an "anywhere access" satellite communication method that integrates "global signaling beam + phased array agile beam", which 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. It supports terminals 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.

[0044] (II) The present invention proposes a "anytime access" satellite communication method based on phased array agile beams. Compared with the traditional global signaling beam access scheme or digital multi-beam access scheme, it has the characteristics of wide beam coverage, dynamic resource configuration, high service communication EIRP and G / T value. It supports terminals to perform "network access authentication" under global signaling beams and "service communication" under phased array agile beams, which improves the communication rate and user experience of small terminals.

[0045] (III) The present invention proposes a resource allocation technology based on a hybrid space-time architecture, which manages and allocates space and time domain resources in a unified manner. Traditional resource allocation technology only manages space resources or time domain resources separately. Time domain resources are divided into synchronization channels, public control channels, status channels, broadcast channels, service channels, etc. Different time domain resources use different space domain wave position hopping rules to achieve accurate matching and control of space domain resources and time domain resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The present invention is a schematic diagram of a flow chart of the use of the "access-as-you-go" satellite communication method based on phased array agile beams.

[0047] Figure 2 This is a wave position division diagram of the phased array agile beam coverage area of ​​the present invention.

[0048] Figure 3 This is a wave position division diagram of the signaling enhancement beam coverage area of ​​the present invention.

[0049] Figure 4 It is a schematic diagram of uplink phased array agile beam uplink synchronization and common control channel wave position hopping of the present invention.

[0050] Figure 5 It is a schematic diagram of downlink phased array agile beam downlink synchronization and state channel wave position hopping of the present invention.

[0051] Figure 6 The present invention is a flow chart of resource allocation of the phased array agile beam to the terminal.

[0052] Figure 7 This is a TDMA synchronization flow chart of the "global signaling beam + phased array agile beam" of the present invention.

[0053] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0054] It should be noted that, unless otherwise specified, all devices and techniques in the present invention are devices and techniques known in the prior art.

[0055] The current satellite communication system cannot take into account the application requirements of global "anywhere access" and regional "high-speed business communication", and there is no system that integrates the global signaling beam and the phased array agile beam. The present invention proposes an "anywhere access" satellite communication method that integrates "global signaling beam + phased array agile beam", which is different from the traditional global signaling beam access solution or digital multi-beam access solution. The present invention combines the advantages of global signaling beams and phased array agile beams, and has the characteristics of wide-area beam coverage, dynamic resource configuration, and high EIRP and G / T values ​​for business communication. It supports terminals to perform "network authentication" under the global signaling beam and "business communication" under the phased array agile beam, which improves the communication rate and user experience of small terminals.

[0056] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0057] Example:

[0058] This embodiment provides a "anywhere access" satellite communication method based on a phased array agile beam. A global antenna is provided in the satellite, and the global antenna communicates through a global signaling beam.

[0059] The satellite is also equipped with a phased array antenna, which communicates through phased array agile beams and signaling enhancement beams.

[0060] Specifically in this embodiment, the phased array agile beam is used to ensure that the terminal can complete "business communication" within the coverage area of ​​the satellite; the phased array signaling enhancement beam is used to support the terminal to complete "anywhere access" within the coverage area of ​​the satellite.

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

[0062] In scenario one, the terminal accesses the network and applies for resources under the global signaling beam. The satellite dispatches the phased array agile beam to point to the terminal, and the terminal completes service communication under the phased array agile beam.

[0063] In scenario two, the terminal accesses the network under the signaling enhanced beam, and the satellite dispatches the phased array agile beam to point to the terminal. The terminal completes resource application and service communication under the phased array agile beam.

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

[0065] Step 1: Wave division:

[0066] The satellite's surface coverage area is divided into wave positions, each wave position is numbered, and the center point position is recorded to form a wave position record table; this is for the phased array antenna to perform query and pointing calculations.

[0067] The beam position division includes the beam position division of the surface coverage area of ​​the phased array agile beam and the beam position division of the surface coverage area of ​​the phased array signaling enhancement beam.

[0068] In this embodiment, Figure 2 As shown in the figure, the surface 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 process of network access and network use, the terminal only needs to report the wave position number of the terminal, and the satellite network control will allocate the corresponding airspace and time domain resources to point to the terminal.

[0069] In this embodiment, the phased array signaling enhancement beam only has uplink reception, and the surface coverage area of ​​the phased array signaling enhancement beam also needs to be divided into beam positions. Figure 3 As shown, the phased array signaling enhancement beam is divided into 61 beam positions.

[0070] Step 2: Jump rule design:

[0071] The phased array agile beam is divided into an uplink phased array agile beam and a downlink phased array agile beam. 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.

[0072] In this embodiment, specifically, Figure 4 As shown in the figure, the uplink phased array agile beam hopping rules involve the uplink synchronization channel, the uplink common control channel and the uplink service channel; the uplink phased array agile beam hopping rules are as follows: one uplink phased array agile beam supports 8-wavelength coverage scheduling, and the uplink phased array agile beam is scheduled and managed according to frames (1 frame duration, service) and 2 multiframes (2 multiframe durations, synchronization and common control signaling), and the scheduling period is defined as 1 frame duration.

[0073] In one scheduling cycle, there are 1 synchronization time slice, 4 public control time slices and 28 service time slices. The synchronization time slice is managed according to 16 scheduling cycles. The synchronization time slice refers specifically to the synchronization channel, which is used by terminals through competition. The service time slice is managed according to 1 scheduling cycle and is allocated and used through 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 residence time unit of the corresponding beam at the current wave position.

[0078] In this embodiment, specifically, Figure 5 As shown in the figure, the downlink phased array agile beam hopping rules involve the downlink synchronization channel, the downlink status channel, the downlink broadcast channel and the downlink service channel; the downlink phased array agile beam hopping rules are as follows: 1 downlink phased array agile beam can correspond to 1 to 2 phased array receiving beams, the downlink phased array agile beam can support a maximum of 16 beam positions for coverage scheduling, and the hopping beam positions of the downlink phased array agile beam have a fixed corresponding relationship with the uplink phased array agile beam; the downlink phased array agile beam is scheduled and managed according to frames (1 frame duration), 2 multi-frames (2 multi-frame duration) and 16 multi-frames (16 multi-frame duration), and the scheduling period is defined as 1 frame duration.

[0079] Within one scheduling cycle, 4 synchronization and status time slices, 26 service time slices and 2 broadcast control time slices are divided; 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 used by terminals in a shared manner; 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 channel is managed according to 16 multi-frame cycles, and each wave position stays for 1 multi-frame cycle; the downlink service channel is scheduled and used in a data-driven manner.

[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 residence time unit of the corresponding beam at the current wave position.

[0085] Step 3: Join the network:

[0086] Step 301, when using a global signaling beam, the terminal completes network access and packet access under the global signaling beam, and the satellite network control allocates corresponding spatial wave position resources and uplink and downlink time domain channel resources to the terminal under the phased array agile beam.

[0087] In this embodiment, the characteristics of the agile beam include both the time dimension and the space dimension. The management of the agile beam includes resource allocation and beam position hopping control, and the latter is driven by the result of the former.

[0088] In step 301, if Figure 6 As shown, when the global signaling beam and the phased array agile beam are fused to carry out "access-as-you-go" satellite communications, the allocation process of spatial wave resources and uplink and downlink time domain channel resources includes the scheduling of the uplink phased array agile beam and the scheduling of the downlink phased array agile beam; the scheduling of the uplink phased array agile beam is different from the scheduling of the downlink phased array agile beam.

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

[0090] The scheduling of the downlink phased array agile beam is driven by the downlink service data. The downlink phased array agile 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 reuse. The pointing of all downlink phased array agile beams only needs to check which wave position the terminal currently using the resources is in, and control the agile beam to point to the wave position of the terminal according to the time slot resource allocation result.

[0091] Step 302: When the signaling enhanced beam is used, the terminal completes network access only under the signaling enhanced beam, and the satellite network control allocates corresponding spatial beam position resources and synchronization control channel resources to the terminal under the phased array agile beam.

[0092] In step 302, 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. 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 agreed time. The satellite network control allocates corresponding spatial wave position resources and time domain channel resources to it under the phased array agile beam according to the position information or wave position number reported when entering the network, and carries out business communications under the phased array agile beam.

[0093] When using the fusion of global signaling beam and phased array agile beam to carry out "anywhere access" satellite communication, the onboard network control allocates spatial domain wave resources and time domain channel resources to the terminal under the phased array agile beam. The specific characteristics are: the agile beam includes two aspects: time dimension and space dimension. The management of the agile beam is resource allocation and wave hopping control. The latter is driven by the result of the former.

[0094] The scheduling of the uplink phased array agile beam is driven by the resource allocation result. The terminal with the most allocated time slices in the beam position determines the beam's residence time in the beam position. The other time slice resources of the beam position can only be allocated to the terminals located in the beam position.

[0095] The scheduling of the downlink phased array agile beam is driven by downlink service data. The downlink phased array agile 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 reuse. The pointing of all downlink phased array agile beams only needs to check which wave position the terminal currently using the resources is in, and control the agile beam to point to the wave position where the terminal is located according to the time slot resource allocation result.

[0096] Step 4: Synchronization and business communication:

[0097] Step 401: When using a global signaling beam, the terminal completes uplink and downlink TDMA synchronization and conducts business communications under the phased array agile beam.

[0098] In this embodiment, specifically, Figure 7 As shown in FIG. 4 , when the global signaling beam and the phased array agile beam are used to carry out "access-as-you-go" satellite communication, the TDMA (Time Division Multiple Access) synchronization process is to switch from the "global signaling beam" to the "phased array agile beam". In step 401, the uplink and downlink TDMA synchronization process is specifically as follows: the terminal completes the 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 step, the uplink and downlink TDMA synchronization is performed again under the phased array agile beam.

[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 phased array’s beam position jump uses the TOD value as the time reference and the TOD edge pulse as the beam position switching enable signal. The time synchronization accuracy of beam position switching and beam forming is as high as 100ns.

[0101] Second, the time slot channel resources allocated by the satellite network control use the TOD value as the time reference. The start and end times of the time slot channel resources are measured using the TOD value. The spatial transmission of the signal uses the TOD edge pulse as the signal transmission or cutoff time. The time synchronization accuracy of the signal transmission can reach 500ns.

[0102] Third, the satellite-to-ground downlink TDMA synchronization uses the TOD value as the time reference. The TOD value is one of the inputs for TDMA time series generation. The TOD pulse is the enabling model for TDMA switching. The synchronization error of satellite-to-ground TDMA synchronization is better than 3.125us, enabling the satellite and the ground to maintain TDMA synchronization.

[0103] Step 402, when using the signaling enhanced beam, complete packet access, uplink and downlink TDMA synchronization, and carry out business communications under the phased array agile beam.

[0104] Specifically, in this embodiment, when the signaling enhancement beam and the phased array agile beam are used to carry out "access-as-you-go" satellite communication, it is different from the use of the global signaling beam and the phased array agile beam. The difference between the two is mainly reflected in:

[0105] First, the types of beams used for terminal network access and packet access are different. For the signaling enhancement beam + phased array agile beam solution, the terminal only completes the network access process under the signaling enhancement beam, and then completes packet access and service communication under the phased array agile beam.

[0106] Second, the signaling enhancement beam refers specifically to the uplink. The signaling enhancement beam divides the surface area covered by the satellite into 61 wave positions, and performs periodic jumps on these 61 wave positions according to a certain rule, thereby achieving the effect of "anywhere access" of the global signaling beam.

[0107] Third, compared with the global signaling beam, the signaling enhancement beam has a higher G / T value and a narrower coverage area of ​​the instantaneous beam, which is more conducive to network access for small terminals.

[0108] Fourth, the TDMA synchronization process of "global signaling beam + phased array agile beam" is switching from "global signaling beam" to "phased array agile beam", while the TDMA synchronization process of "signaling enhanced beam + phased array agile beam" is switching from "signaling enhanced beam" to "phased array agile beam", the two are different.

[0109] In step 402, the uplink and downlink TDMA synchronization process is specifically as follows: the terminal completes the 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 is lost, the uplink and downlink TDMA synchronization is performed again under the phased array agile beam.

[0110] Step 5: Log out:

[0111] After the terminal completes business communication, it exits the network under the phased array agile beam.

[0112] In this embodiment, the specific process of network withdrawal is as follows: the terminal sends a network withdrawal application on the uplink public control channel, receives a network withdrawal response on the corresponding downlink service channel, and the satellite network control recovers the spatial wave position resources and time domain channel resources of the terminal, which can be used by other terminals for application.

[0113] It can be seen from the above embodiments that, compared with the prior art, the present invention has the advantages of both global signaling beams and phased array agile beams. Compared with the traditional global signaling beam access scheme or digital multi-beam access scheme, it has the characteristics of wide-area beam coverage, dynamic resource configuration, high EIRP and G / T value for business communication. It supports terminals to perform "network access authentication" under the global signaling beam and "business communication" under the phased array agile beam, which improves the communication rate and user experience of small terminals; on the other hand, it adopts a resource allocation technology based on a space-time hybrid architecture to unify resource management and allocation in the space and time domains. Traditional resource allocation technology only manages space resources or time domain resources separately. Time domain resources are divided into synchronization channels, public control channels, status channels, broadcast channels, business channels, etc. Different time domain resources use different space domain wave position hopping rules to achieve accurate matching and control of space resources and time domain resources.

[0114] It can be seen from the above embodiments that the method of the present invention can meet the application requirements of global "anywhere access" and high-speed business communications of small terminals, improve the accuracy of agile beam control and the flexibility of resource allocation, lay a technical foundation for the subsequent development of "anywhere access" satellite communication systems, and provide solutions for reference, which has broad market application prospects.

[0115] From the above embodiments, it can be seen that the present invention adopts a satellite communication method that integrates "global beam + phased array agile beam", which has the advantages of global beam and phased array agile beam, and has the characteristics of wide-area beam coverage, dynamic resource configuration, high service connectivity EIRP and GT value. The global antenna has a wide-area 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, it supports the terminal to perform "network access authentication" under the wide-area global beam, and also supports the terminal to perform "network access authentication" under the high-gain phased array signaling enhancement beam, and "service connectivity" under the phased array agile beam, which greatly improves the communication rate and user experience of small terminals.

Claims

1. A "anywhere access" satellite communication method based on phased array agile beam, wherein a global antenna is provided in the satellite, and the global antenna communicates through a global signaling beam, characterized in that: The satellite is also provided with a phased array antenna, which communicates via a phased array agile beam; the phased array agile beam includes a signaling enhancement beam; The working mode of the communication between the satellite and the terminal is divided into two scenarios: Scenario 1: The terminal accesses the network and applies for resources under the global signaling beam. The satellite dispatches the phased array agile beam to point to the terminal, and the terminal completes the service communication under the phased array agile beam. In scenario two, the terminal accesses the network under the signaling enhanced beam, and the satellite dispatches the phased array agile beam to point to the terminal. The terminal completes resource application and service communication under the phased array agile beam.

2. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Wave division: Divide the satellite's surface coverage area into wave positions, number each wave position, and record the center point position to form a wave position record table; The beam position division includes the beam position division of the surface coverage area of ​​the phased array agile beam and the beam position division of the surface coverage area of ​​the phased array signaling enhancement beam; Step 2: Jump rule design: The phased array agile beam is divided into an uplink phased array agile beam and a downlink phased array agile beam, and the hopping rules of the phased array agile beam include an uplink phased array agile beam hopping rule and a downlink phased array agile beam hopping rule; Step 3: Join the network: Step 301: When a global signaling beam is used, the terminal completes network access and packet access under the global signaling beam, and the satellite network control allocates corresponding spatial wave position resources and uplink and downlink time domain channel resources to the terminal under the phased array agile beam; Step 302: When the signaling enhanced beam is used, the terminal completes network access only under the signaling enhanced beam, and the satellite network control allocates corresponding spatial beam position resources and synchronization control channel resources to the terminal under the phased array agile beam; Step 4: Synchronization and business communication: Step 401, when using a global signaling beam, the terminal completes uplink and downlink TDMA synchronization and conducts service communications under a phased array agile beam; Step 402, when using the signaling enhanced beam, completing packet access, uplink and downlink TDMA synchronization, and carrying out business communications under the phased array agile beam; Step 5: Log out: After the terminal completes business communication, it exits the network under the phased array agile beam.

3. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 2, characterized in that: In step 1, the surface coverage area of ​​the phased array agile beam is divided into 1069 wave positions in total; and the phased array signaling enhancement beam is divided into 61 wave positions.

4. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 2, characterized in that: In step 2, the uplink phased array agile beam hopping rule is: One uplink phased array agile beam supports eight beam position coverage scheduling. The uplink phased array agile beam is scheduled and managed according to frames and two multiframes, and the scheduling period is defined as one frame duration. In one scheduling cycle, 1 synchronization time slice, 4 public control time slices and 28 service time slices are divided; the synchronization time slice is managed according to 16 scheduling cycles; the synchronization time slice refers specifically to the synchronization channel, and the terminal uses it through competition; the service time slice is managed according to 1 scheduling cycle, and the service time slice is allocated and used through the satellite network control.

5. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 2, characterized in that: In step 2, the downlink phased array agile beam hopping rule is: One downlink phased array agile beam can correspond to 1 to 2 phased array receiving beams. The downlink phased array agile beam can support coverage scheduling of up to 16 beam positions. The downlink phased array agile beam is scheduled and managed according to frames, 2 multiframes and 16 multiframes, and the scheduling period is defined as 1 frame duration. In one scheduling cycle, 4 synchronization and status time slices, 26 service time slices and 2 broadcast control time slices are divided; 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 used by terminals in a shared manner; 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 channel is managed according to 16 multi-frame cycles, and each wave position stays for 1 multi-frame cycle; the downlink service channel is scheduled and used in a data-driven manner.

6. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 2, characterized in that: In step 301, the allocation process of the spatial domain wave position resources and the uplink and downlink time domain channel resources includes the scheduling of the uplink phased array agile beam and the scheduling of the downlink phased array agile beam; The scheduling of the uplink phased array agile beam is driven by the resource allocation result, and the terminal with the most allocated time slices in the wave position determines the residence time of the beam in the wave position, and other time slice resources of the wave position can only be allocated to the terminals located in the wave position; The scheduling of the downlink phased array agile beam is driven by downlink service data. The downlink phased array agile 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 reuse. The pointing of all downlink phased array agile beams only needs to check which wave position the terminal currently using the resources is in, and control the agile beam to point to the wave position where the terminal is located according to the time slot resource allocation result.

7. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 2, characterized in that: In step 302, 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. 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 agreed time. The satellite network control allocates corresponding spatial wave position resources and time domain channel resources to it under the phased array agile beam according to the position information or wave position number reported when entering the network, and carries out business communication under the phased array agile beam. When using the fusion of global signaling beam and phased array agile beam to carry out "access-as-you-go" satellite communication, the satellite network control allocates spatial domain wave resources and time domain channel resources to the terminal under the phased array agile beam. The specific characteristics are: the agile beam includes two aspects: time dimension and space dimension. The management of the agile beam includes resource allocation and wave hopping control, and the latter is driven by the result of the former. The scheduling of uplink phased array agile beams is driven by resource allocation results. The terminal with the most allocated time slices in the beam position determines the beam's residence time in the beam position. The other time slice resources of the beam position can only be allocated to the terminals located in the beam position. The scheduling of the downlink phased array agile beam is driven by downlink service data. The downlink phased array agile 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 reuse. The pointing of all downlink phased array agile beams only needs to check which wave position the terminal currently using the resources is in, and control the agile beam to point to the wave position where the terminal is located according to the time slot resource allocation result.

8. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 2, characterized in that: In step 401, the uplink and downlink TDMA synchronization process is specifically 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 lost, the uplink and downlink TDMA synchronization is performed again under the phased array agile beam.

9. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 8, characterized in that: In step 401, during the uplink and downlink TDMA synchronization process, TOD time is used as a unified time reference.

10. The "access-as-you-go" satellite communication method based on phased array agile beam as claimed in claim 2, characterized in that: In step 402, the uplink and downlink TDMA synchronization process is specifically 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 is lost, the uplink and downlink TDMA synchronization is performed again under the phased array agile beam.

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