Satellite cluster ground substation subsystem

Abstract

The invention discloses a satellite cluster ground substation subsystem, and relates to a satellite cluster ground substation which is characterized in that a satellite communication interface and a ground wireless interface of a satellite mobile terminal are utilized to realize space-ground networking between a ground substation upper connection satellite gateway station and a ground substation lower connection ground substation terminal and other ground users. Telephone and trunking terminal communication services of a satellite mobile communication system are migrated to a ground radio channel without damage and omission and are presented to a user in a satellite docking ground terminal form, and the user can obtain dual service functions of local trunking communication and satellite communication; in addition, other terrestrial radio systems are accessed into the satellite mobile communication system, so that other terrestrial users obtain satellite communication services. A non-blocking normally-connected air-ground networking communication system jointly composed of the satellite mobile terminal, the ground cluster user terminal, the radio station, the public telephone network user and the public mobile network user is formed.

Description

Technical Field

[0001] The present invention belongs to the field of satellite communication, and particularly relates to a satellite cluster ground sub-station subsystem. Background Art

[0002] A satellite mobile communication system refers to a system that uses the relay forwarding or switching function of a geostationary communication satellite to connect mobile terminals (stations) within its coverage area to the core network of a ground gateway station (system) for service switching to achieve mobile communication; when the services supported by the satellite mobile communication system are point-to-point voice and data services, we call it a conventional service; when the services supported by the satellite mobile communication system are point-to-multipoint voice and data services, we call it a trunking service.

[0003] The ground radio system mainly includes a trunking communication system and a radio station system. The trunking communication system is composed of trunking mobile stations, trunking base stations, and networking switches. The trunking mobile stations use the PTT (Push To Talk) method to conduct trunking one-to-many intercom communication within the coverage area of the base station networking. When out of the coverage area, the mobile stations use the direct mode DMO (Direct Mode Operation) for intercom communication. The radio station system is an intercom call system in which two or more radio stations use PTT operation on the same frequency point. The radio station system can be regarded as a direct mode call of the trunking mobile station.

[0004] Satellite mobile communication has the advantages of wide communication coverage area, little influence by the ground environment, and suitability for field communication. However, satellite terminals must point to the satellite during communication, which brings inconvenience to users. The communication coverage range of the ground radio system is relatively small, and large-scale networking is restricted by topography and engineering construction. Especially in the field communication environment and at the scene of sudden disaster rescue, the communication distance is restricted, and it is difficult to carry out command communication between the front and the rear. However, the ground mobile station is flexible and convenient to use and is suitable for on-site command communication.

[0005] With the construction and development of satellite mobile communication systems, especially the popularization and use of satellite trunking communication, there is an urgent need for a space-ground networking trunking communication system that can quickly network and expand in any environment. Such a system is suitable for on-site trunking command communication and can also achieve long-distance command. In addition, in many fields such as transportation, maritime affairs, forestry, fire protection, patrol, tourism, and foreign aid, there is a particular need for a radio communication system that can connect across regions and across the ocean via satellite wide-area networking and support local trunking at any time for local and remote use.

[0006] In order to meet the above-mentioned usage requirements of space-ground communication, the common methods adopted are:

[0007] (1) The trunking base station is connected to the satellite in series

[0008] By using the networking interface of the existing cluster base stations or systems and adding satellite access devices, one end of the device is connected to the PSTN networking interface of the base station, and the other end is connected to the communication satellite. The cluster mobile stations covered by the base station use the original PSTN calling method and call through the satellite connected to the base station to the telephone network or satellite phone connected to the gateway station. The advantage of this method is that the existing base stations and mobile stations can obtain the function of making satellite phone calls without modification. However, the disadvantage is that the base station is large in volume, heavy in weight and high in power consumption, and is not suitable for carrying in field emergency rescue, especially when there is no power supply in the emergency site, it is difficult to activate the cluster base station.

[0009] (2) Satellite-ground cluster gateway

[0010] The satellite-ground gateway is connected to the satellite at one end and the ground cluster DMO direct mode mobile station at the other end through wireless means. Using the satellite communication system as a link, two gateways located in different places are connected together to achieve point-to-point connection between the gateways, and the cluster mobile stations can conduct cross-satellite intercom. The advantage of this method is that the ground cluster mobile stations can communicate over long distances through the satellite. However, the disadvantage is that the ground mobile stations cannot communicate with the satellite phone and the PSTN connected to the satellite network, and when deploying the gateways, they must be configured in pairs, and the usage conditions are greatly restricted.

[0011] (3) Converged communication platform

[0012] The converged communication method is to establish a converged communication platform that is connected to both the satellite and the ground cluster communication system at the same time. The converged communication platform accesses the communication services to the platform seats in the form of satellite terminals or ground mobile terminals, and the platform seats have communication capabilities in multiple directions. This solution solves the problem of the convergence of satellite communication and ground communication, but does not solve the problem of the penetration of the satellite-ground network. The ground cluster users cannot directly communicate with the satellite users, and all communications can only end at the platform seats. Summary of the Invention

[0013] Aiming at the above problems, the purpose of the present invention is to provide a satellite cluster ground sub-station subsystem. On the one hand, it migrates the telephone and cluster terminal communication services of the satellite mobile communication system to the ground radio channel without damage and omission and presents them to users in the form of ground terminals docked with satellites. Users can obtain dual service functions of local cluster communication and satellite communication. On the other hand, it connects other ground radio systems to the satellite mobile communication system, enabling other ground users to obtain satellite communication services. A non-blocking and always-connected space-ground networking communication system composed of satellite mobile terminals, ground cluster user terminals, radio stations, public telephone network users, and public mobile network users is formed.

[0014] The specific technical solution to achieve the purpose of the present invention is as follows:

[0015] A satellite cluster ground sub-station subsystem, comprising a ground sub-station and a sub-station terminal;

[0016] The ground sub-station is connected to a ground gateway station through a communication satellite channel and to the sub-station terminal through a wireless channel. The sub-station terminal is connected to the ground sub-station through a ground wireless interface.

[0017] Furthermore, the ground sub-station is provided with networking communication interfaces in multiple directions, including a northbound interface, a southbound interface, an eastbound interface, and a westbound interface;

[0018] The northbound interface is a satellite baseband and radio frequency interface, supporting circuit domain and packet domain services. The ground sub-station is connected to the ground gateway station through the northbound interface;

[0019] The southbound interface includes a sub-station terminal access wireless interface and other heterogeneous ground user access wireless interfaces. The ground sub-station is connected to the sub-station terminal through the user terminal wireless interface. The ground sub-station is connected to existing various types of other ground cluster terminals, cluster base stations, and radio stations through different mode wireless interfaces;

[0020] The eastbound interface is a mobile public network terminal baseband and radio frequency interface. The ground sub-station accesses the mobile public network through the eastbound interface;

[0021] The westbound interface is a MESH network interface. The ground sub-station is connected to local neighboring sub-stations through the westbound interface to achieve the interconnection of each ground sub-station.

[0022] Furthermore, the ground sub-station is provided with a sub-station signaling control entity and a sub-station media exchange entity. The sub-station signaling control entity takes the southbound interface of the ground sub-station as the user network UNI interface, takes the northbound interface of the ground sub-station as the primary network interconnection NNI interface, and takes the eastbound interface and the westbound interface of the ground sub-station as the secondary network interconnection NNI interfaces to perform call signaling routing selection and switching control; the sub-station media exchange entity is used to implement the media exchange of the networking communication interfaces in four directions.

[0023] Furthermore, the circuit domain signaling control and media of the northbound interface and the eastbound interface are separated, respectively forming a wide area network signaling control entity, a satellite circuit domain media processing entity, a mobile public network circuit domain media processing entity, and a packet domain processing adaptation entity;

[0024] The circuit domain signaling control and media of the southbound interface and the westbound interface are separated, respectively forming a radio access network signaling control entity and a radio access network media processing entity;

[0025] Among them, the users of the radio access network include sub-station terminals and other existing ground cluster users.

[0026] Further, the ground sub-station is respectively provided with a main handle interface and an auxiliary handle interface for connecting the main handle and the auxiliary handle;

[0027] The main handle includes a handle signaling control entity, a handle media processing entity, a handle keyboard, a handle display, and a handle speaker microphone;

[0028] The auxiliary handle is a radio simulation interface, which is connected to the existing ground terminal through the earphone, microphone, and PTT control line of the mobile station or radio. The lead-in function entity is DML, and it is connected to other existing ground trunking users through an analog lead.

[0029] Further, the ground sub-station is provided with an operation keyboard, a sub-station call status display, Beidou positioning, Bluetooth communication, and a console interface entity;

[0030] The ground sub-station is also provided with a wired networking expansion interface and a packet domain switching interface, which are respectively used for the mutual connection between local sub-stations and providing data expansion applications for the packet domain of the wide area network.

[0031] Further, the ground sub-station is provided with a control module for controlling the ground sub-station subsystem;

[0032] The control module includes a main control core module, a main handle module, an auxiliary handle module, a wide area network interface module, and an access network interface module;

[0033] The main control core module is respectively connected to the main handle module, the auxiliary handle module, the wide area network interface module, and the access network interface module. Among them, the main control core module is connected to the main handle module through a first control plane interface, the main control core module is connected to the auxiliary handle module through a second control plane interface, the main control core module is connected to the wide area network interface module through a third control plane interface and a fourth control plane interface. The third control plane interface controls the circuit domain, the fourth control plane interface controls the packet domain, and the main control core module is connected to the access network interface module through a fifth control plane interface.

[0034] Further, the ground sub-station receives the cross-satellite sub-station cluster group configuration information through the northbound interface and transmits it to the wide area network interface module. After the wide area network interface module separates the cluster group configuration information, it reports it to the sub-station signaling control entity through the third control plane interface. The sub-station signaling control entity stores the configuration data and sends the grouping configuration information to the main handle module, the auxiliary handle module, and the radio access network module respectively;

[0035] The ground sub-station receives the local cluster grouping configuration through the console interface entity and reports it to the sub-station signaling control entity. The sub-station signaling control entity sends the grouping configuration information to the main handle module, the auxiliary handle module, and the radio access network module respectively;

[0036] The main handle module, auxiliary handle module, wide area network interface module, and radio access network module of the ground sub-station regularly send status reports to the sub-station signaling control entity, and the console interface entity queries the BRC to obtain the working status of each module of the sub-station;

[0037] When the sub-station signaling control entity fails to receive the status report of the monitored module, it issues a display alarm to the sub-station call status display and an audio alarm.

[0038] Furthermore, the main handle module, auxiliary handle module, wide area network interface module, and radio access network module of the ground sub-station initiate calls to the sub-station signaling control entity through the first control plane interface to the fifth control plane interface via the unified call control protocol;

[0039] The calls include group call, individual call, and PSTN phone call;

[0040] The starting call information of the group call appears on any one of the first control plane interface to the fifth control plane interface. The sub-station signaling control entity determines the call route by querying the group configuration information and forwards the starting call information to the remaining participating directions;

[0041] The individual call appears on the first control plane interface, the fourth control plane interface, or the fifth control plane interface. The sub-station signaling control entity queries the called entity of the individual call and forwards the routing signaling;

[0042] The PSTN phone call appears on the first control plane interface, the third control plane interface, or the fifth control plane interface. The sub-station signaling control entity determines the call route and forwards the starting call information to the called participating direction.

[0043] Furthermore, the main handle module, auxiliary handle module, wide area network interface module, and radio access network module of the ground sub-station initiate short messages to the sub-station signaling control entity through the first control plane interface to the fifth control plane interface via the unified call control protocol;

[0044] The short messages include group call short message, individual call short message, and PSTN phone short message;

[0045] The group call short message appears on any one of the first control plane interface to the fifth control plane interface. The sub-station signaling control entity determines the short message route by querying the group configuration information and forwards the short message to the remaining participating directions;

[0046] The individual call short message appears on the first control plane interface, the fourth control plane interface, or the fifth control plane interface. The sub-station signaling control entity queries the recipient of the individual call short message and performs routing selection and short message forwarding;

[0047] The PSTN telephone short message appears on the first control plane interface, the third control plane interface or the fifth control plane interface, and the substation signaling control entity determines the short message route and forwards it to the recipient.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] (1) The present invention provides a satellite cluster ground substation subsystem that utilizes a satellite mobile terminal's satellite communication interface and a ground wireless interface to realize ground substations that are connected to satellite gateways and ground substation terminals and other ground users to form a space-ground network. The substation terminals obtain local cluster voice single call and group call communication functions with the help of the ground substation's switching and forwarding services. The substation terminals can also present satellite conventional telephone and cluster group call service functions without loss of performance or omission. The substation terminals also support satellite and ground single call and group call data communication and location services, etc.

[0050] (2) The present invention adopts a soft switching technology method that separates control from media, abstracts a substation subnet architecture composed of logical functional entities, interfaces and protocols; further, according to software and hardware design requirements, the entities associated with global control and different routing directions are combined to form five independent modules, including a core module and four interface modules. The core module is used as a backbone and the interface modules are used as branches to connect together; each interface module and the core module are interconnected using a unified signaling control protocol and a unified media encoding;

[0051] (3) The external interfaces of the interface modules in the present invention are respectively connected to satellites, mobile public networks, cluster private networks or substation users and master and auxiliary handles; the inter-module interfaces are connected to the core control module, and the functional entities in each module are all intra-module entities and interfaces except for the external interfaces and inter-module interfaces, forming an independent design unit, which is convenient for the distributed design and development of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic diagram of the satellite cluster ground substation subsystem architecture of the present invention.

[0053] Figure 2 It is a schematic diagram of the interfaces in the satellite cluster ground substation subsystem of the present invention.

[0054] Figure 3 It is a schematic diagram of the system architecture in the satellite cluster ground substation subsystem of the present invention.

[0055] Figure 4 It is a schematic diagram of the interfaces in the satellite cluster ground substation subsystem of the present invention.

[0056] Figure 5Schematic diagram of the control module in the satellite cluster ground sub-station subsystem of the present invention.

[0057] Figure 6 Schematic diagram of the communication structure in the satellite cluster ground sub-station subsystem of the present invention. Detailed implementation manners

[0058] The satellite mobile communication system consists of communication satellites, ground gateway stations, and satellite communication terminals. In addition to completing the call connection control of satellite terminals, the gateway station is also connected to the ground circuit-switched public telephone network PSTN (Public Switched Telephone Network), the public land mobile network PLMN (Public Land Mobile Network), and the packet-switched Internet, realizing the interconnection and interoperability between the satellite mobile communication system and the ground public communication network. When the satellite mobile communication system has the cluster service function, satellite terminals can also perform group communication sharing satellite channels;

[0059] A satellite cluster ground sub-station subsystem includes a ground sub-station and a sub-station terminal;

[0060] The ground sub-station is connected to the ground gateway station through a communication satellite channel and to the sub-station terminal through a wireless channel. The sub-station terminal is connected to the ground sub-station through a ground wireless interface. The sub-station terminal accesses the ground sub-station through the ground wireless interface to obtain three networking services, namely, sub-station local cluster, satellite phone, and satellite cluster communication, as well as the sub-station communication forwarding function.

[0061] The ground sub-station subsystem joins the satellite mobile communication system in the identity of a satellite terminal. The ground sub-station and satellite terminal that join the system have the same communication status and satellite communication function. The addition of the ground sub-station subsystem does not change the communication methods of the existing ground gateway station and satellite terminals, nor does it change the overall communication protocol and communication process of the system, and the gateway station and satellite terminals are not affected.

[0062] Further, the ground sub-station is provided with networking communication interfaces in multiple directions, including a northward interface, a southward interface, an eastward interface, and a westward interface;

[0063] The northward interface entity is the satellite baseband and radio frequency interface STM (Satellite terminal interface), which supports circuit-switched and packet-switched services. The satellite cluster service can be located in the circuit-switched domain or the packet-switched domain, while the satellite phone service is located in the circuit-switched domain. The ground sub-station is connected to the ground gateway station through the northward interface (satellite channel). The ground sub-station presents the identity of a satellite terminal on this interface and can realize services such as satellite phone calls, satellite cluster calls, and satellite packet-switched Internet access;

[0064] The southward interface includes a sub-station terminal access wireless interface BMA (Branch station mobile access interface) and other heterogeneous ground user access wireless interface DMA (Different mode mobile access interface). The ground sub-station connects to the sub-station terminal through the user terminal wireless interface, and connects to various existing types of other ground trunking terminals, trunking base stations, and radio stations through different mode wireless interfaces; the sub-station terminal has the satellite phone and satellite trunking high-level protocol compatibility capabilities of the northward interface, and can obtain the phone and trunking communication service functions of the satellite mobile communication system; other various types of ground trunking terminals, base stations, and radio stations can access the ground sub-station to obtain the satellite trunking communication group call service function of the northward interface.

[0065] The eastward interface is a mobile public network terminal baseband and radio frequency interface MTM (Mobile terminal interface). The ground sub-station accesses the mobile public network through the eastward interface and accesses phone and data services through the mobile public network wireless access; this interface supports public network circuit domain and packet domain services. The ground sub-station presents the identity of a public network mobile terminal on this interface and can implement public network phone services and packet domain Internet access services.

[0066] The westward interface is a MESH network interface (Mesh network interface). The ground sub-station connects to local neighboring sub-stations through the westward interface to realize the interconnection of each ground sub-station, and can obtain the cluster single call and group call communication service functions between sub-stations through the local MESH network.

[0067] Furthermore, the ground sub-station is provided with a sub-station signaling control entity BRC (Branch station control) and a sub-station media exchange entity (Brach station medium processor). The sub-station signaling control entity BRC regards the southward interface of the ground sub-station as the user network UNI interface (USER-NETWORK INTERFACE), regards the northward interface of the ground sub-station as the main network interconnection NNI interface (NETWORK-NETWORK INTERFACE), and regards the eastward interface and westward interface of the ground sub-station as auxiliary network interconnection NNI interfaces to perform call signaling routing selection and switching control; the sub-station media exchange entity BMP is used to realize the media exchange of the networking communication interfaces in four directions.

[0068] Furthermore, the circuit domain signaling control and media of the northbound interface STM and the eastbound interface MTM are separated, respectively forming a wide area network signaling control entity WNC (Wide area network control), a satellite circuit domain media processing entity SCP (Satellite circuit medium processor), a mobile public network circuit domain media processing entity MCP (Mobile network circuit medium processor), and a packet domain processing adaptation entity PKT (Packet domain adaption);

[0069] The circuit domain signaling control and media of the southbound interfaces DMA, BMA, and the westbound interface MESH are separated, respectively forming a radio access network signaling control entity RCC (Radio channel control) and a radio access network media processing entity RMP (Radio medium processor); The users of the radio access network are the branch station terminal BMR (Branch station mobile radio) and other existing ground trunking users MMR (Multi-different mode mobile radio); The branch station terminal can be combined with the DMA functional entity to form a handheld gateway. The handheld gateway has the dual functions of a satellite phone and a satellite trunking, and also has the wireless access function of other existing trunking terminals and can be used as a wireless terminal;

[0070] Among them, the users of the radio access network include the branch station terminal and other existing ground trunking users.

[0071] Furthermore, the ground branch stations are respectively provided with a main handle interface and a secondary handle interface for connecting the main handle and the secondary handle;

[0072] The main handle includes a handle signaling control entity HSC (Handset control), a handle media processing entity HSM (Handset medium processor), a handle keyboard HKEY, a handle display HDIS, and a handle speaker microphone EASP;

[0073] The secondary handle interface is a radio analog interface, which is connected to the existing ground terminal through the earphone, microphone, and PTT control line of the mobile station or the radio. The access function entity is DML (Different mode mobile lead), which is connected to other existing ground trunking users MMR through an analog lead.

[0074] Furthermore, the ground sub-station is provided with an operation keyboard KEY, a sub-station call status display DISP, a Beidou positioning GEO, a Bluetooth communication BLUE, and an operator console interface entity OPT(Operator);

[0075] The ground sub-station is also provided with a wired networking expansion interface EXS and a packet domain switching interface SWH, which are respectively used for the mutual connection between local sub-stations and for providing data expansion applications in the packet domain of the wide area network.

[0076] The above constitutes the system architecture of the satellite cluster ground sub-station subsystem. This system architecture uses BRC as the sub-station signaling control center and BMP as the media exchange center, and constructs a main handle digital interface control and media processing entity set and a secondary handle analog interface control entity set; constructs an external interface control and media processing entity set for wide area network remote relay and wireless access network user access, etc.; the ground sub-station is also provided with interface entities for operation and maintenance, geographic information collection, wired interconnection between sub-stations, and packet domain data applications, etc.

[0077] Furthermore, the ground sub-station is provided with a control module for controlling the ground sub-station subsystem;

[0078] The control module is divided into five module combination entities according to the system architecture, including a main control core module, a main handle module, a secondary handle module, a wide area network interface module, and an access network interface module. There are five control interfaces between the modules;

[0079] The main control core module is respectively connected to the main handle module, the secondary handle module, the wide area network interface module, and the access network interface module. Among them, the main control core module is connected to the main handle module through the first control plane interface A1, the main control core module is connected to the secondary handle module through the second control plane interface A2, the main control core module is connected to the wide area network interface module through the third control plane interface A3 and the fourth control plane interface A4. The third control plane interface A3 controls the circuit domain, and the fourth control plane interface A4 controls the packet domain. The main control core module is connected to the access network interface module through the fifth control plane interface A5.

[0080] The rest of the interfaces are all internal module interfaces. The interfaces between the five modules adopt a unified protocol, and the main functions of the protocol include cluster group configuration management, device status management, and call control, etc.

[0081] The cluster group configuration management of the ground sub-station includes cross-satellite sub-station group configuration and local group configuration of the station itself;

[0082] The ground substation receives the cross-satellite substation cluster group configuration information through the northbound NNI satellite circuit domain interface and transmits it to the wide area network interface module. After the wide area network interface module separates the cluster group configuration information, it reports to the substation signaling control entity BRC through the third control plane interface A3. The substation signaling control entity BRC stores the configuration data and sends the grouping configuration information to the main handle module, auxiliary handle module, and radio access network module respectively;

[0083] The ground substation receives the local cluster grouping configuration through the console OPT interface entity and reports it to the substation signaling control entity. The substation signaling control entity BRC sends the grouping configuration information to the main handle module, auxiliary handle module, and radio access network module respectively;

[0084] Device status management of the ground substation: The main handle module, auxiliary handle module, wide area network interface module, and radio access network module of the ground substation regularly send status reports to the substation signaling control entity BRC and store them in the internal DB (DataBase) database of the entity. The console interface entity OPT queries the BRC to obtain the working status of each module of the substation;

[0085] When the substation signaling control entity BRC fails to receive the status report of the monitored module, it issues a display alarm to the substation call status display DISP and issues an audio alarm.

[0086] Furthermore, the main handle module, auxiliary handle module, wide area network interface module, and radio access network module of the ground substation initiate calls to the substation signaling control entity through the first control plane interface A1 to the fifth control plane interface A5 respectively, using the unified call control protocol;

[0087] The calls include group call, individual call, and PSTN phone call;

[0088] The starting call information of the group call appears on any one of the first control plane interface A1 to the fifth control plane interface A5. The substation signaling control entity BRC determines the call route by querying the group configuration information and forwards the starting call information to the other participating call directions. After the call is successful, BMP needs to perform media connection and forwarding from any direction to the other participating parties;

[0089] The individual call appears on the first control plane interface A1, the fourth control plane interface A4, or the fifth control plane interface A5. The substation signaling control entity BRC queries the called entity of the individual call and forwards the routing signaling. After the call is successful, BMP needs to perform media connection and forwarding from any direction to the other party;

[0090] A satellite, PSTN or PLMN telephone call appears on the first control plane interface A1, the third control plane interface A3 or the fifth control plane interface A5. The sub-station signaling control entity BRC determines the call routing and forwards the initial call information in the direction of the called party participating in the call. The forwarding of the initial call message is only carried out on another interface. After the call is successful, the BMP needs to perform full-duplex media connection forwarding;

[0091] Further, the main handle module, auxiliary handle module, wide area network interface module and radio access network module of the ground sub-station respectively initiate short messages to the sub-station signaling control entity through the first control plane interface A1 to the fifth control plane interface A5 via the unified call control protocol;

[0092] The short messages include trunking group call short messages, trunking single call short messages and PSTN telephone short messages;

[0093] The trunking group call short message appears on any one of the first control plane interface A1 to the fifth control plane interface A5. The sub-station signaling control entity determines the short message routing by querying the group configuration information and forwards the short message in the direction of the remaining participants;

[0094] The trunking single call short message appears on the first control plane interface A1, the fourth control plane interface A4 or the fifth control plane interface A5. The sub-station signaling control entity queries the recipient of the trunking single call short message and performs routing selection and short message forwarding;

[0095] The PSTN telephone short message appears on the first control plane interface A1, the third control plane interface A3 or the fifth control plane interface A5. The sub-station signaling control entity determines the short message routing and forwards it to the recipient, that is, forwards it to the first control plane interface A1 or the fifth control plane interface A5 in the downlink direction to the recipient; or forwards the short message of the local user upward to the wide area network interface module of the third control plane interface A3.

[0096] The present invention will be further described below in conjunction with embodiments.

[0097] Embodiment

[0098] In the existing satellite mobile communication system, a trunking ground sub-station subsystem is arranged through the interface of the satellite terminal connecting to the ground gateway station, such as Figure 1 shown;

[0099] The sub-station subsystem, like the satellite terminal, accesses the ground gateway station through the communication satellite and becomes a part of the satellite mobile communication system; the sub-station subsystem provides ground radio coverage and incorporates the sub-station terminal or other existing trunking users into the satellite communication range;

[0100] Combined with Figure 2, in addition to arranging satellite and sub-station user interfaces, the ground sub-station also arranges mobile public network and local self-organizing network MESH interfaces, separates the signaling control and media of each interface, separates the circuit domain and packet domain of the satellite and mobile public network, forms the control plane and media user plane of each interface of the ground sub-station and sets relevant logical function entities; sets the sub-station central control logic entity BRC and the sub-station media exchange logic entity BMP to process the signaling and data information of the control plane and media service plane respectively.

[0101] Combined with Figure 3 , set relevant logical function entities for the main handle and auxiliary handle of the ground sub-station. The main handle is used for the communication of the sub-station operator, and the auxiliary handle is used for connecting the analog signals of other radio devices to the sub-station; set logical interface entities such as Beidou positioning, Bluetooth communication, keyboard input, display, and operation and maintenance computer for the ground sub-station, which are under the control and management of the BRC, and form a network system structure of the ground sub-station subsystem composed of logical function entities and interfaces between entities;

[0102] Combined with Figure 3 , define the logical function entities of the architecture:

[0103] (1) Function entities of the core main control part

[0104] 1) BRC (Branch station Control), the signaling control center of the sub-station, whose function is to control the whole system through the signaling of the control plane. DB (Data base) is the internal database of the BRC.

[0105] 2) BMP (Branch station medium processor), the media exchange center of the sub-station, whose function is to exchange the voice service media flowing through the sub-station, and the media is digital vocoder.

[0106] 3) Function entities of the main control peripheral part

[0107] a) GEO (Geography), the geographic information positioning entity, including Beidou or GPS positioning function.

[0108] b) DISP (Dispay), the main control display screen of the sub-station.

[0109] c) KEY (Keyboard), the input keyboard of the sub-station.

[0110] d) BLUE (Bluetooth), the Bluetooth communication module of the sub-station.

[0111] e) OPT (Operator), the operation and maintenance computer terminal of the sub-station, which is used for the operation and maintenance of the sub-station and the display of geographic information of the sub-station terminal users.

[0112] f) SWH (Switch), Packet domain switch.

[0113] g) EXS (Extension), Substation extension interface.

[0114] (2) Function entities of the main handle part

[0115] 1) HSC (Hand set control), Handle control entity.

[0116] 2) HSM (Hand set medium processor), Handle media processor.

[0117] 3) HKEY (Hand set key board), Handle keyboard.

[0118] 4) HDIS (Hand set display), Handle display.

[0119] 5) EASP (Earphone and speaker), Earphone and microphone.

[0120] (3) Function entities of the auxiliary handle part

[0121] 1) DML (Different mode mobile lead): Heterogeneous mode mobile station lead-in entity, and FIFO is the media buffer function inside this entity.

[0122] 2) MMR (Multi-different mode mobile radio): Ground heterogeneous radio terminal connected by using analog voice and PTT leads.

[0123] (4) Function entities of the wide area network interface part

[0124] 1) WNC (Wide area network control), Wide area network signaling control entity.

[0125] 2) STM (Satellite terminal interface), Satellite baseband and radio frequency interface.

[0126] 3) MTM (Mobile terminal interface), Mobile public network terminal baseband and radio frequency interface.

[0127] 4) PKT (Packet domain adaption), Packet data adaption entity, used for packet domain interface adaption between satellite and mobile public network.

[0128] 5) SCP (Satellite circuit medium processor), satellite circuit domain media processing. FIFO is the media buffering function inside this entity.

[0129] 6) MCP (Mobile network circuit medium processor), mobile public network circuit domain media processing.

[0130] (5) Functional entities of the radio access network interface part

[0131] 1) RCC (Radio channel control), radio channel control entity.

[0132] 2) RMP (Radio medium processor), radio channel media switching and processing.

[0133] 3) BMA (Branch station mobile access interface), sub-station terminal access radio interface.

[0134] 4) DMA (Different mode user access interface), other heterogeneous terrestrial user access radio interface and gateway. FIFO is the media buffering function inside this entity.

[0135] 5) MESH (Mesh network interface), ad-hoc network radio interface.

[0136] 6) BMR (Branch mobile radio), sub-station terminal.

[0137] 7) MMR (Multi-different Mode mobile Radio), other heterogeneous terrestrial radio user terminal functional entity.

[0138] Combined with Figure 4 and Figure 5 , the ground sub-station is provided with a control module for controlling the ground sub-station subsystem;

[0139] The control module is divided into five module combination entities according to the architecture, including a main control core module, a main handle module, an auxiliary handle module, a wide area network interface module, and an access network interface module. There are five control interfaces between the modules;

[0140] The main control core module is respectively connected to the main handle module, the auxiliary handle module, the wide area network interface module, and the access network interface module. Among them, the main control core module is connected to the main handle module through the first control plane interface A1, the main control core module is connected to the auxiliary handle module through the second control plane interface A2, the main control core module is connected to the wide area network interface module through the third control plane interface A3 and the fourth control plane interface A4. The third control plane interface A3 controls the circuit domain, and the fourth control plane interface A4 controls the packet domain. The main control core module is connected to the access network interface module through the fifth control plane interface A5.

[0141] For example, when the gateway station issues a grouping signaling to the ground sub-station, the cluster grouping information is sent from the wide area network interface module to the main control core module along the third control plane A3 interface of the circuit domain. The sub-station signaling control entity BRC will receive such a grouping information:

[0142] Group name: GROUPa, group number: 17411912345 (for example): Group initiator: single call number of the satellite terminal, list of group members: list of single call numbers of satellite users participating in the group;

[0143] At this time, after the satellite grouping configuration of the ground sub-station is completed, the BRC of the ground sub-station configures a corresponding ground group for the terminal BMRs of this sub-station. The group type is GT1 using satellite vocoder, and the group identifier is the CPI (Channel Path Identity) truncated bit encoding group, forming the corresponding group CPI of GROUPa and the local list of group members. The BRC configures the cluster group CPI to the main handle through the A1 interface, to the auxiliary handle through the A2 interface, and to the access network module RCC through the A5 interface. The RCC broadcasts the list of BMRs of the members corresponding to the CPI of this station to the BMA. All participating user BMRs configure this group after parsing the broadcast signaling through the air interface.

[0144] Then, at this time, a space-ground cluster terminal grouping is completed. A grouping named GROUPa appears on the screens of the sub-station terminal BMRs participating in the grouping of this station. Any terminal BMR within the group can actively initiate a cluster call of this group, and the remaining terminals can answer the call of this group in real time.

[0145] The main handle module, the auxiliary handle module, the wide area network interface module, and the wireless access network module of the ground sub-station regularly send status reports to the sub-station signaling control entity BRC and store them in the internal DB (Data Base) database of the entity. The console interface entity OPT queries the BRC to obtain the working status of each module of the sub-station;

[0146] When the sub-station signaling control entity BRC fails to receive the status report of the monitored module, it issues a display alarm to the sub-station call status display DISP and issues an audio alarm.

[0147] Furthermore, the main handle module, auxiliary handle module, wide area network interface module, and radio access network module of the ground sub-station respectively initiate calls to the sub-station signaling control entity through the first to fifth control plane interfaces A1 to A5 via the unified call control protocol;

[0148] The calls include group call, individual call, and PSTN telephone call;

[0149] The starting call information of the group call appears on any one of the first to fifth control plane interfaces A1 to A5. The sub-station signaling control entity BRC determines the call route by querying the group configuration information and forwards the starting call information to the other participating call directions. After the call is successful, BMP needs to perform media connection and forwarding from any one direction to the other participating parties;

[0150] The individual call appears on the first control plane interface A1, the fourth control plane interface A4, or the fifth control plane interface A5. The sub-station signaling control entity BRC queries the called entity of the individual call and forwards the routing signaling. After the call is successful, BMP needs to perform media connection and forwarding from any one direction to the other party;

[0151] The satellite, PSTN, or PLMN telephone call appears on the first control plane interface A1, the third control plane interface A3, or the fifth control plane interface A5. The sub-station signaling control entity BRC determines the call route and forwards the starting call information to the called participating call direction. The starting call message is only forwarded on another interface. After the call is successful, BMP needs to perform full-duplex media connection and forwarding;

[0152] When the ground sub-station accesses the satellite mobile communication system through the circuit domain, it can obtain dual communication functions of satellite telephone and satellite trunking. The sub-station can access the sub-station terminal through the access network BMA interface and access other ground trunking terminals or base stations through the access network DMA interface to realize satellite trunking and ground trunking network communication.

[0153] For specific illustration, we take the DMA access to the ground police digital trunking terminal PDT (Police Digital Trunking) MS (Mobile Station) and the digital mobile radio terminal DMR (Digital Mobile Radio ETSI) MS as examples to illustrate the communication structure of the sub-station subsystem, as Figure 6 shown:

[0154] 1) The satellite interface control entity WNC configures a satellite trunking group number for the sub-station BMR, and this group number acts on the A3 interface.

[0155] 2) The sub-station BRC configures a satellite cluster corresponding truncation group number CPI for the access network RCC, and this group number acts on the A5 interface.

[0156] 3) The sub-station BRC configures a satellite cluster corresponding truncation group number CPI for the main handle HSC, and this group number acts on the A1 interface.

[0157] 4) The access network RCC configures a truncation group number CPI for the interface entities BMA and DMA, and the DMA needs to bind a cluster group number of the police digital trunking PDT.

[0158] 5) The sub-station BMA configures a truncation group number CPI for the handheld gateway, and its DMA needs to bind a cluster group number of the digital mobile radio DMR.

[0159] 6) The sub-station DMA performs voice codec and protocol conversion from PDT to the satellite cluster, the handheld gateway DMA performs voice codec and protocol conversion from DMR to the satellite cluster, and the BMR and the main handle use the satellite cluster voice codec.

[0160] 7) Due to the use of full-duplex channels, the main handle, the sub-station terminal, and the handheld gateway can obtain satellite phone and satellite cluster communication functions.

[0161] 8) Due to the use of trunking half-duplex channels and other system signaling communications, the PDT terminal and the DMR terminal do not support PSTN phone calls and can obtain satellite cluster group call communication functions.

[0162] 9) Whether it is the sub-station handle, the sub-station terminal, the PDT terminal, the DMR terminal, or the satellite cluster terminal, when any party presses the PTT to speak, the same satellite cluster group (satellite terminal), the corresponding truncated CPI group (sub-station handle and sub-station terminal), and the cluster group terminals of the PDT and DMR bound to the CPI can all receive the cluster group call in real time. After the speaking party finishes speaking and releases the PTT, other party users can press the PTT to speak and everyone can receive, realizing the group call communication function of various types of cluster terminals on the ground and in space through satellite networking.

[0163] The above embodiments show and describe the basic principles and main features of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A satellite cluster ground sub-station subsystem, characterized in that It includes a ground sub-station and a sub-station terminal; The ground sub-station is connected to the ground gateway station through a communication satellite channel and to the sub-station terminal through a wireless channel. The sub-station terminal is connected to the ground sub-station through a ground wireless interface.

2. The satellite cluster ground sub-station subsystem according to claim 1, characterized in that The ground sub-station is provided with networking communication interfaces in multiple directions, including a northward interface, a southward interface, an eastward interface, and a westward interface; The northward interface is a satellite baseband and radio frequency interface, supporting circuit domain and packet domain services. The ground sub-station is connected to the ground gateway station through the northward interface; The southward interface includes a sub-station terminal access wireless interface and other heterogeneous ground user access wireless interfaces. The ground sub-station is connected to the sub-station terminal through the user terminal wireless interface, and the ground sub-station is connected to existing various types of other ground cluster terminals, cluster base stations, and radio stations through different mode wireless interfaces; The eastward interface is a mobile public network terminal baseband and radio frequency interface. The ground sub-station accesses the mobile public network through the eastward interface; The westward interface is a MESH network interface. The ground sub-station is connected to local neighboring sub-stations through the westward interface to realize the interconnection of each ground sub-station.

3. The satellite cluster ground sub-station subsystem according to claim 2, characterized in that, The ground sub-station is provided with a sub-station signaling control entity and a sub-station media exchange entity. The sub-station signaling control entity takes the southward interface of the ground sub-station as the user network UNI interface, takes the northward interface of the ground sub-station as the main network interconnection NNI interface, and takes the eastward interface and westward interface of the ground sub-station as the auxiliary network interconnection NNI interfaces to perform call signaling routing selection and switching control; The sub-station media exchange entity is used to realize the media exchange of the networking communication interfaces in four directions.

4. The satellite cluster ground sub-station subsystem according to claim 2, characterized in that, The circuit domain signaling control and media of the northward interface and the eastward interface are separated, respectively forming a wide area network signaling control entity, a satellite circuit domain media processing entity, a mobile public network circuit domain media processing entity, and a packet domain processing adaptation entity; The circuit domain signaling control and media of the southward interface and the westward interface are separated, respectively forming a radio access network signaling control entity and a radio access network media processing entity; Among them, the users of the radio access network include sub-station terminals and other existing ground cluster users.

5. The satellite cluster ground sub-station subsystem according to claim 1, characterized in that, The ground sub-station is respectively provided with a main handle interface and an auxiliary handle interface for connecting the main handle and the auxiliary handle The main handle includes a handle signaling control entity, a handle media processing entity, a handle keyboard, a handle display, and a handle speaker microphone; The auxiliary handle is a radio simulation interface, connected to existing ground terminals through the earphone, microphone, and PTT control line of a mobile station or a radio. The lead-in function entity is DML, and is connected to other existing ground cluster users through an analog lead.

6. The satellite cluster ground sub-station subsystem according to claim 1, characterized in that The ground sub-station is provided with an operation keyboard, a sub-station call status display, Beidou positioning, Bluetooth communication, and a console interface entity; The ground sub-station is also provided with a wired networking expansion interface and a packet domain switching interface, which are respectively used for the mutual connection between local sub-stations and for providing data expansion applications in the wide area network packet domain.

7. The satellite cluster ground sub-station subsystem according to any one of claims 1-6, characterized in that The ground sub-station is provided with a control module for controlling the ground sub-station subsystem; The control module includes a main control core module, a main handle module, an auxiliary handle module, a wide area network interface module, and an access network interface module; The main control core module is connected to the main handle module, the auxiliary handle module, the wide area network interface module and the access network interface module respectively, wherein the main control core module is connected to the main handle module via a first control plane interface (A1), the main control core module is connected to the auxiliary handle module via a second control plane interface (A2), the main control core module is connected to the wide area network interface module via a third control plane interface (A3) and a fourth control plane interface (A4), the third control plane interface (A3) controls the circuit domain, the fourth control plane interface (A4) controls the packet domain, and the main control core module is connected to the access network interface module via a fifth control plane interface (A5).

8. The satellite cluster ground sub-station subsystem according to claim 7, characterized in that, The ground substation receives the inter-satellite substation cluster group configuration information through the northbound interface and transmits it to the wide area network interface module. After the wide area network interface module separates the cluster group configuration information, it reports to the substation signaling control entity through the third control plane interface (A3). The substation signaling control entity stores the configuration data and sends the grouping configuration information to the main handle module, the auxiliary handle module, and the wireless access network module respectively. The ground substation receives the local trunking grouping configuration through the console interface entity and reports it to the substation signaling control entity. The substation signaling control entity sends the grouping configuration information to the main handle module, auxiliary handle module, and wireless access network module respectively; The main handle module, auxiliary handle module, wide area network interface module and wireless access network module of the ground substation regularly send status reports to the substation signaling control entity, and the console interface entity queries the BRC to obtain the working status of each module of the substation; When the substation signaling control entity cannot receive the status report of the monitored module, a display alarm is sent to the substation call status display and an audio alarm is issued.

9. The satellite cluster ground sub-station subsystem according to claim 7, characterized in that, The main handle module, auxiliary handle module, wide area network interface module and wireless access network module of the ground substation respectively initiate a call to the substation signaling control entity through the first control plane interface (A1) to the fifth control plane interface (A5) through the unified call control protocol; The calls include trunking group calls, trunking individual calls and PSTN telephone calls; The initial call information of the cluster group call appears on any one of the first control plane interface (A1) to the fifth control plane interface (A5), and the substation signaling control entity determines the call route by querying the group configuration information and forwards the initial call information to the directions of the other participating calls; The cluster single call appears on the first control plane interface (A1), the fourth control plane interface (A4) or the fifth control plane interface (A5), and the substation signaling control entity queries the called party of the cluster single call and performs routing signaling forwarding; A PSTN telephone call occurs on the first control plane interface (A1), the third control plane interface (A3) or the fifth control plane interface (A5), and the substation signaling control entity determines the call routing and forwards the initial call information in the direction of the called party participating in the call.

10. The satellite cluster ground sub-station subsystem according to claim 7, characterized in that, The main handle module, auxiliary handle module, wide area network interface module, and radio access network module of the ground sub-station respectively initiate short messages to the sub-station signaling control entity through the first control plane interface (A1) to the fifth control plane interface (A5) via the unified call control protocol; The short messages include trunk group call short messages, trunk single call short messages, and PSTN phone short messages; The trunk group call short message appears on any one of the first control plane interface (A1) to the fifth control plane interface (A5). The sub-station signaling control entity determines the short message routing by querying the group configuration information and forwards the short message to the remaining participating directions; The trunk single call short message appears on the first control plane interface (A1), the fourth control plane interface (A4), or the fifth control plane interface (A5). The sub-station signaling control entity queries the recipient of the trunk single call short message and performs routing selection and short message forwarding; The PSTN phone short message appears on the first control plane interface (A1), the third control plane interface (A3), or the fifth control plane interface (A5). The sub-station signaling control entity determines the short message routing and forwards it to the recipient.

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