CN116707605A - Satellite cluster ground substation subsystem and terminal interface protocol implementation method thereof - Google Patents
Satellite cluster ground substation subsystem and terminal interface protocol implementation method thereof Download PDFInfo
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
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- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18569—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance
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Abstract
The invention discloses a satellite trunking ground sub-station subsystem and a terminal interface protocol realization method thereof, which realize that a ground sub-station uplink satellite gateway station downlink sub-station terminal performs space-earth networking, wherein the sub-station terminal obtains local trunking voice single call and group call communication functions by means of satellite exchange and forwarding service of the ground sub-station through a ground air interface protocol, and the sub-station subsystem also provides position data short message collecting and reporting functions comprising the ground sub-station and a sub-station user terminal through a satellite channel, so that a remote command can master geographic position and action track information of the ground sub-station and a user in real time, and provides necessary technical support for emergency command communication; in addition, the terminal interface protocol can be used for a novel satellite cluster and satellite telephone substation terminal BMR (Brach station Mobile Radio), and a novel satellite cluster and satellite telephone function of the BMR substation terminal can be obtained by supplementing a protocol stack on the basis of keeping the original function on the basis of the existing PDT or DMR cluster terminal.
Description
Technical Field
The invention belongs to the field of satellite communication, and particularly relates to a satellite trunking ground substation subsystem and a terminal interface protocol implementation method thereof.
Background
The satellite mobile communication system is a system for realizing mobile communication by accessing a mobile terminal (station) in a coverage area of a geosynchronous orbit communication satellite to a ground gateway station (system) core network and performing service exchange by using a relay forwarding or exchange function of the geosynchronous orbit communication satellite; when the service supported by the satellite mobile communication system is a point-to-point voice and data service, we refer to as a conventional service; when the services supported by the satellite mobile communication system are point-to-multipoint voice and data services, we refer to as trunked services.
The terrestrial radio system mainly includes a trunked communication system and a station radio system. The trunking communication system consists of trunking mobile stations, trunking base stations and networking switches, wherein the trunking mobile stations perform trunking one hundred call intercommunication in a base station networking coverage area in a PTT (Posh To Talk) mode, and after the trunking mobile stations are separated from the coverage area, the mobile stations perform the intercommunication in a through mode DMO (Direct Mode Operation), and currently, the national ground trunking takes police digital trunking PDT (Police Digital Trunking System) and digital radio DMR (Digital Mobile Radio-ETSI) as main application systems. Whereas a radio system is an intercom-call system with PTT operation with two or more radios on the same frequency point, the radio system can be regarded as a trunked mobile-to-talk mode call.
The satellite mobile communication has the advantages of wide communication coverage area, small influence by the ground environment, suitability for field communication and the like, but the satellite terminal must be used for satellites during communication, and inconvenience is brought to users. The ground radio system has relatively small communication coverage, large-scale networking is limited by topography and engineering construction, communication distance is limited in a sudden disaster rescue scene especially in a field communication environment, front and back command communication is difficult to spread, but a ground mobile station is flexible and convenient to use and suitable for on-site command communication.
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 an heaven-earth networking trunking communication system capable of rapidly networking and expanding under any environment. The system is suitable for on-site trunking command communication and can realize remote command. In addition, in many fields such as traffic, maritime, forest, fire control, patrol, travel, and rescue, a radio communication system capable of local, off-site, transoceanic, wide-area networking by satellite and local cluster following is particularly needed.
The main mode adopted by the air interface protocol of the existing ground cluster terminal is as follows:
(1) Different frequency duplex
When the different frequency duplex communication mode is adopted, the method is divided into an uplink channel and a downlink channel. The mobile station adopts lower frequency transmission as an uplink channel and higher frequency reception as a downlink channel; the base station uses the opposite transmit and receive frequencies as the mobile station. The scheme has the advantages that the base station can continuously transmit downlink frequency and simultaneously continuously receive uplink frequency by using the frequency division duplex, so that the use efficiency of a channel is improved; the mobile station can use time division duplex to distinguish receiving and transmitting by staggering transmitting and receiving time slots, thereby reducing the volume weight of the mobile station and reducing the transmitting power consumption. However, the disadvantage is that the base station needs to send signaling carrier in the downlink signaling channel for a long time, which increases power consumption; and the volume and weight of the base station are increased due to the use of the frequency division multiplexing duplexer.
(2) Simplex with same frequency
When the same-frequency simplex communication mode is adopted, two or more DMO through-mode mobile stations simultaneously listen to the same frequency point, and any mobile station user presses the PTT key to preempt the channel speaking, and releases the PTT key to release the channel after the speaking is completed. When the DMO mobile station adopts a TDMA digital trunking mode, a speaking party user occupies one TDMA time slot to bear voice, and other time slots can be idle or can bear return digital information or other information according to different air interface protocols. The PDT cluster DMO mode for police in China adopts a two-time slot structure. One slot carries voice or data and the other slot is idle. The same-frequency simplex mode has the advantages of simple protocol structure and easy realization; but has the disadvantage that duplex telephone calls are not supported and the dialing and answering functions for satellite telephone service cannot be achieved using the DMO protocol.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a satellite trunking ground substation subsystem and a method for implementing a terminal interface protocol thereof, which on one hand, migrate a telephone and trunking terminal communication service of a satellite mobile communication system to a ground radio channel without damage and omission and present the service to a user in the form of a satellite-docked ground substation terminal, and the user can obtain dual service functions of local trunking communication and satellite communication; on the other hand, other ground radio systems can be connected into the satellite mobile communication system, so that the existing ground users can obtain satellite communication services. The satellite mobile terminal, the substation terminal, the ground trunking user terminal, the radio station, the public telephone network user and the public mobile network user form a non-blocking common-communication space-earth networking communication system.
The specific technical scheme for realizing the purpose of the invention is as follows:
a satellite cluster ground substation subsystem comprises a ground substation and a substation terminal;
the ground substation is communicated with the ground gateway station through a communication satellite channel, is communicated with a substation terminal through a wireless channel, and is communicated with the ground substation through a ground wireless interface.
Further, the ground substation is provided with networking communication interfaces in multiple directions, including a north interface, a south interface, an east interface and a west interface;
the north interface supports circuit domain service and packet domain service, and the ground substation is connected with the ground gateway station through the north interface;
the south interface is accessed to a substation terminal, other existing various ground trunking terminals, trunking base stations and radio stations by using a ground wireless channel;
the east interface supports circuit domain service and packet domain service, and the ground substation is accessed into the mobile public network through the east interface;
the Western interface is an MESH network interface, and the ground substations are connected with the local friend substations through the Western interface, so that the interconnection of the ground substations is realized.
Further, the ground substation is provided with a substation call control entity and a substation media processing entity;
the substation call control entity takes a southbound interface of a ground substation as a user network UNI interface, a northbound interface of the ground substation as a main network interconnection NNI interface, and an eastbound interface and a western interface of the ground substation as an auxiliary network interconnection NNI interface to carry out routing selection and exchange control of call signaling;
the substation media processing entity is responsible for the media exchange of the four directional interfaces.
Further, the substation terminal accesses a user network UNI interface of the ground substation based on the same-frequency duplex wireless channel to perform uplink signal access and downlink signal forwarding;
other users access a user network UNI interface of a ground substation by adopting the existing communication mode, and the ground substation provides satellite cluster networking communication based on a gateway;
the other users comprise a through mobile station adopting DMO mode to access the substation, a trunked base station adopting TMO mode to access the substation, and various ground radio stations adopting wireless channel mode to access the substation.
Further, the access of the user network UNI interface of the ground substation and the substation terminal adopts an air interface protocol stack;
the air interface protocol stack comprises three layers of protocols: a physical layer, a data link layer, and a call control layer;
the air interface protocol stack includes a control plane for signaling or data transfer and a user plane for voice media transfer;
the high-level protocols of the control plane of the air interface protocol stack comprise an air interface loading group configuration data protocol, a telephone call control protocol, a cluster group call control protocol, a cluster single call control protocol, a direct mode call control protocol and a short message service control protocol.
Further, the physical layer adopts a PDT/DMR straight-through mode common-frequency two-time-slot duplex wireless interface, the ground terminal adopts a first time slot for transmission, and the ground substation adopts a second time slot for transmission;
when the substation terminal occupies the first time slot for transmission, two synchronous feature codes are adopted to distinguish signaling data and voice media on the first time slot;
the ground substation occupies the second time slot when transmitting, and adopts the other two synchronous feature codes to distinguish the signaling data and the voice media on the second time slot.
On the other hand, the invention provides a terminal interface protocol implementation method based on any one of the above systems, comprising the following steps:
step 1, a ground substation is accessed to the network based on a satellite cluster ground substation subsystem, receives satellite cluster air interface grouping configuration, and a legal substation terminal connected with the ground substation is configured with a user terminal number, and performs terminal access registration through a user network UNI interface;
step 2, if the substation terminal is successful in network access, the substation terminal enters an idle waiting state and listens to the telephone call and the trunking signaling call of the time slot I and the time slot II;
and step 3, if the access of the substation terminal is unsuccessful in the off-network through or the access of the substation terminal is successful in the judgment through or the notification through, the substation terminal listens to the trunking signaling through call of the time slot I and the time slot II.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides a ground substation subsystem for realizing the space-earth networking of a satellite communication interface and a ground wireless interface by utilizing a satellite mobile terminal, wherein the substation terminal obtains local trunking voice single call and group call communication functions by means of satellite exchange and forwarding service of a ground substation through a ground air interface protocol, the substation terminal can also present satellite conventional telephone and trunking group call service functions without damaging functions, and the substation terminal also supports the functions of data communication, position service and the like of satellite and ground single call group call; the substation subsystem also provides the functions of collecting and reporting the position data short messages comprising the ground substation and the substation user terminal through the satellite channel, so that the remote command post can grasp the geographic positions and action track information of the ground substation and the user in real time, and necessary technical support is provided for emergency command communication;
(2) The substation terminal user in the subsystem can perform cluster local communication and inter-satellite communication in any shielded fields such as a forest, a house, a tent, a cabin, a tunnel and the like, and the satellite communication service of the substation terminal keeps the same function and performance as those of the satellite mobile terminal;
(3) The air interface protocol of the substation terminal not only supports the functions of satellite telephone, satellite cluster and local cluster communication service, but also particularly supports the direct mode call of the substation terminal when the substation terminal is separated from the ground coverage of the substation, and the direct mode call and the cluster call are automatically completed without manual switching. The substation terminal air interface protocol accords with the index requirements of radio frequency and radio frequency bandwidth (12.5 KHz) of the national radio standard specification system and trunking radio communication;
(4) The air interface protocol stack of the substation terminal can be used for novel satellite trunking and satellite telephone substation terminals BMR (Brach station Mobile Radio), and a novel satellite trunking and satellite telephone function of the BMR substation terminal can be obtained by supplementing the protocol stack on the basis of keeping the original functions on the basis of the existing PDT or DMR trunking terminals.
Drawings
Fig. 1 is a schematic diagram of a satellite mobile communication system and a satellite trunking ground station subsystem architecture according to the present invention.
Fig. 2 is a schematic diagram of a satellite trunking ground substation and its interfaces according to the present invention.
Fig. 3 is a schematic diagram of a ground terminal air interface protocol stack according to the present invention.
Fig. 4 is a diagram of a physical layer slot structure and synchronization signature of an air interface protocol stack according to the present invention.
Fig. 5 is a schematic diagram of a network access search state of a ground terminal according to the present invention.
Fig. 6 is a diagram showing a state transition of a ground terminal network access according to the present invention.
Detailed Description
The satellite mobile communication system consists of communication satellites, ground gateway stations and satellite communication terminals. The gateway station is connected with the public telephone network PSTN (Public Switched Telephone Network) of the ground circuit domain, the public land mobile network PLMN (Public Land Mobile Network) and the packet domain Internet (Internet) besides completing the call connection control of the satellite terminal, thereby realizing the interconnection and intercommunication of the satellite mobile communication system and the ground public communication network. When the satellite mobile communication system has the cluster service function, the satellite terminal can also perform the cluster communication of the shared satellite channel.
A satellite cluster ground substation subsystem comprises a ground substation and a substation terminal;
the ground substation is communicated with the ground gateway station through a communication satellite channel, is communicated with a substation terminal through a wireless channel, and is communicated with the ground substation through a ground wireless interface.
Further, the ground substation is provided with networking communication interfaces in multiple directions, including a north interface, a south interface, an east interface and a west interface;
the north interface supports circuit domain service and packet domain service, and the ground substation is connected with the ground gateway station through the north interface; wherein satellite trunking services can be located in the circuit domain or in the packet domain, and satellite telephony services are located in the circuit domain. The ground substation presents the satellite terminal identity on the interface, and can realize the services of satellite telephone call, satellite cluster call, satellite packet domain internet surfing and the like;
the south interface is accessed to a substation terminal, other existing various ground trunking terminals, trunking base stations and radio stations by using a ground wireless channel; the substation terminal has the compatibility of a satellite telephone with a northbound interface and a satellite trunking high-level protocol, and can obtain the telephone and trunking communication service functions of a satellite mobile communication system; other trunking terminals, base stations, radio stations and the like can be accessed to the ground substation to obtain the satellite trunking communication group call service function of the northbound interface;
the east interface supports circuit domain service and packet domain service, the ground substation accesses the mobile public network through the east interface, and the ground substation presents the identity of the public network mobile terminal on the interface, so that the public network telephone call service and packet domain internet surfing service can be realized;
the Western interface is an MESH network interface, and the ground substations are connected with the local friend substations through the Western interface, so that the interconnection of the ground substations is realized. The cluster single call and group call communication service functions between the substations can be obtained through the local MESH network.
Further, the ground substation is provided with a substation call control entity and a substation media processing entity;
the substation call control entity takes a southbound interface of a ground substation as a USER NETWORK UNI (USER-NETWORK INTERFACE) interface, a northbound interface of the ground substation as a main NETWORK interconnection NNI (NETWORK-NETWORK INTERFACE) interface, and an eastbound interface and a western interface of the ground substation as an auxiliary NETWORK interconnection NNI interface to carry out routing selection and exchange control of call signaling;
the substation media processing entity is responsible for the media exchange of the four directional interfaces.
Further, the substation terminal accesses to a user network UNI interface of the ground substation based on the same-frequency duplex wireless channel to perform uplink signal access and downlink signal forwarding, so as to ensure that the substation terminal obtains wireless coverage service equivalent to a base station;
other users access a user network UNI interface of a ground substation by adopting the existing communication mode, and the ground substation provides satellite cluster networking communication based on a gateway;
the other users comprise a through mobile station adopting DMO (Direct Mode Operation) mode to access the substation, a cluster base station adopting TMO (Trunking Mode Operation) mode to access the substation, and various ground radio stations adopting wireless channel mode to access the substation.
Further, the access of the user network UNI interface of the ground substation and the substation terminal adopts an air interface protocol stack;
the air interface protocol stack comprises three layers of protocols: a Physical Layer (Physical Layer), a Data Link Layer (Data Link Layer), and a call control Layer (Call Control Layer);
the air interface protocol stack includes a Control Plane (Control Plane) for signaling or data transfer and a User Plane (User Plane) for voice media transfer;
higher layer protocols of the Control plane of the air interface protocol stack include air interface loading Group configuration Data protocol (Over Air Group Configuration), telephone Call Control protocol (PSTN Call Control), group Call Control protocol (Group Call Control), group Call Control protocol (Individual Call Control), direct mode Call Control protocol (DM Call Control), short message service Control protocol (PSTN Shot Data, group Shot Data and Individual Shot Data).
Further, the physical layer adopts a PDT/DMR straight-through mode common-frequency two-Time-Slot duplex wireless interface, the ground terminal transmission adopts a Time Slot one (TDMA Time Slot1 or TDM 1), and the ground substation transmission adopts a Time Slot two (TDMA Time Slot2 or TDM 2);
when the substation terminal occupies the time slot one TDM1 for transmitting, two 48-bit synchronous feature codes SYNC are adopted to distinguish signaling data and voice media on the time slot one TDM 1;
the same ground substation occupies a time slot two TDM2 when transmitting, and adopts another two synchronous feature codes SYNC to distinguish signaling data and voice media on the time slot two TDM2, so that protocol residence can be realized by directly utilizing the time slot and frame structure of a PDT/DMR through mode physical layer;
in order to reduce the emission power consumption of the ground substation, when the ground substation does not have service forwarding and is in an idle state, the ground substation can be in a silent state on a time slot two TDM2 according to the own time slot beat, and also can randomly emit burst signals existing in the ground substation according to the needs, and a terminal receiving the signals existing in the ground substation adjusts the time slot to be synchronous to the ground substation;
on the other hand, the invention provides a terminal interface protocol implementation method based on any system, which comprises the following steps:
step 1, in the existing satellite mobile communication system, a trunking ground substation subsystem is arranged through an interface of a satellite terminal uplink ground gateway station, the ground substation uses the existing satellite conventional network access registration flow like a satellite terminal, registers and registers with a core network through a gateway station controller, enters an idle waiting state after success, and listens to a satellite single call paging channel and a trunking group call control channel;
the ground substation is provided with a satellite, a mobile public network, a local MESH and a user terminal interface, the ground substation registers with the mobile public network by the user identity besides registering with the core network of the satellite ground gateway station in a more-than-step mode, and enters an idle waiting state after success, and listens to the paging call of the mobile public network;
the ground substation is connected to the network based on the satellite cluster ground substation subsystem, receives satellite cluster air interface grouping configuration, the satellite cluster grouping configuration is initiated by a satellite cluster grouping terminal, and after the grouping configuration is completed, the ground substation is configured with satellite cluster group names and group numbers. The ground substation operation desk configures a substation user terminal white list, wherein the white list consists of all legal terminal users of the ground substation, and the substation user terminal number and the terminal priority are used as white list items; the ground substation also needs to configure wireless frequency points used by the UNI user terminal interface, and the frequency points at least comprise two: a main frequency point and a service frequency point;
the legal substation terminal connected with the ground substation configures a user terminal number, and the terminal number can be configured when the terminal leaves a factory; the terminal is also required to be configured with a main working frequency point and other available frequency point lists for connecting with the ground substation; when the ground substation is not reachable, the main frequency point is used as the work frequency point of the off-network direct connection. The substation terminal searches the ground service substation according to the configuration list;
the substation terminal performs terminal network access registration through a user network UNI interface, specifically:
step 1-1, after the substation terminal is started, firstly searching and locking the current working frequency point of the ground substation, namely firstly checking a frequency point configuration list of the substation terminal, starting from a main frequency point, listening to the broadcast on the time slot two TDM2 of the frequency point, if the broadcast of the ground substation is not received over time, actively initiating inquiry on the time slot one TDM1 until the response of the ground substation on the time slot two TDM2 is received, locking the response frequency point, searching successfully, and turning to the step 1-2;
if the substation does not answer all the time, the main frequency point is shifted to enter an off-network straight-through state;
step 1-2, after the substation terminal locks the ground substation working frequency point, firstly listening whether a channel time slot TDM1 is idle or not, and if the channel time slot TDM1 is occupied, backing and waiting for idle; if the time slot one TDM1 is idle, the time slot structure of the signaling synchronous feature code can be used for establishing the signaling for registering network access on the time slot one TDM1, after the substation terminal is registered in the network access, the substation automatically loads the satellite cluster grouping configuration data air interface of the terminal (Over Air Group Configuration), and the network access terminal display interface for completing grouping loading is automatically updated into the current ground substation satellite cluster and the local station cluster grouping configuration menu.
Step 2, if the substation terminal is successful in network access, the substation terminal enters an idle waiting state, listens to the telephone call and the cluster signaling call of the time slot one TDM1 and the time slot two TDM2, and when the following conditions occur, the substation terminal is separated from the idle waiting state:
(1) The substation terminal receives the telephone call of the ground substation on the time slot two TDM2 channels, the substation terminal is switched into a telephone answering state, uses PSTN call control protocol (PSTN Call Control) and is switched into a PSTN called mode, the PSTN called mode is irrelevant to trunking service, uses full duplex telephone call and media flow to answer satellite or PSTN public network telephone forwarded by the substation and receive PSTN short message service (PSTN Shot Data)
(2) The substation terminal receives cluster group call establishment signaling of a group number configured by the local machine on a time slot two TDM2, and the substation terminal is switched into a cluster group call answering state, uses a cluster group call control protocol (Group Call Control) and is switched into a group call called mode; the mode supports half duplex cluster Group call voice forwarded by the substation and receives Group call short message service (Group Shot Data);
(3) The substation terminal receives a cluster single call establishment signaling of a single call number configured by the substation terminal on a time slot two TDM2, and the substation terminal is switched to a cluster single call receiving state, and is switched to a single call mode by using a cluster single call control protocol (Individual Call Control); the mode supports half duplex trunked single call voice and receive single call short message service (Individual Shot Data) forwarded by the outstation.
(4) The telephone PSTN call control protocol (PSTN Call Control) of the substation terminal initiates a satellite or PSTN telephone call on the time slot TDM1, and the terminal is switched into a telephone calling mode; the substation terminal can call and communicate to a remote satellite or PSTN telephone through the satellite conventional telephone protocol stack of the substation, so as to realize telephone full duplex media voice transmission or send PSTN short message service (PSTN Shot Data)
(5) The cluster group call control protocol (Group Call Control) of the substation terminal initiates a cluster group call on the time slot TDM1, the terminal is switched to a cluster group call state, and the cluster group call control protocol is used for switching to a cluster group call calling mode; the mode supports the Group call half duplex voice and Group call short message service (Group Shot Data) forwarded by the substation;
(6) The trunking single call control protocol (Individual Call Control) of the substation terminal initiates a trunking single call on time slot one TDM1, the terminal switches to trunking single call state, uses the trunking single call control protocol and switches to trunking single call calling mode. The mode supports single call half duplex voice containing and single call short message service (Individual Shot Data) forwarded by the outstation.
Step 3, if the access of the substation terminal is unsuccessful in the off-line through or the access of the substation terminal is successful in the decision through or the notification through, the substation terminal listens to the trunking signaling through call of the time slot one TDM1 and the time slot two TDM2, and the substation terminal is separated from the idle waiting state when the following conditions occur:
(1) The substation terminal receives cluster group Call establishment signaling of a direct DM (Direct Mode) group number configured by the local on a time slot one TDM1 or a time slot two TDM2, and the substation terminal interface displays that the cluster group is calling and automatically shifts to a called answering mode of a cluster direct protocol (DM Call Control), wherein the mode is a semi-double group Call voice service;
(2) The substation terminal initiates a trunking direct-Call through a direct-mode Call Control protocol (DM Call Control), and the terminal shifts to a trunking direct-Call calling mode, which is a half-duplex group Call voice service.
Further, the ground substation and the substation terminal use CPI (Channel Path Identity) bit truncated group number method to represent a satellite or ground cluster group number:
1) Cpi=0 is defined as a through call.
2) Cpi=30 is defined as a trunked single call.
3) Cpi=31 is defined as a PSTN telephone call.
4) The remaining CPI values may be dynamically allocated for use in accordance with the cluster groupings of the substation satellites and the intra-station cluster groupings.
The bit occupation space of the air interface group address protocol field of the sub-station terminal is effectively saved by adopting the CPI interception group number method; the trunking calling number extension supports eleven decimal (37 bits) satellite trunking phones and substation terminal numbers; the improvement of the two address spaces enables the address space of the calling party and the called party to be 43 (6+37) bits, so that the air interface protocol of the substation terminal can directly utilize the cluster signaling structure body of the existing PDT or DMR (48 bits of the address space of the calling party and the called party) to design and bear.
The ground section wireless channel between the substation terminal and the ground substation uses the same sound code of the satellite telephone or the satellite cluster to transmit voice media, and when the sound code voice is mutually forwarded to the satellite channel, the sound code conversion is not performed; especially when two or more ground sub-stations or satellite cluster terminals are used for group calling through the satellite cluster, the voice nondestructive forwarding method of sound code transparent transmission is adopted from ground to satellite and from satellite to ground, so that the best voice quality of the sub-station terminals and the satellite terminals participating in the calling is ensured.
The invention is further illustrated below with reference to examples.
Examples
Referring to fig. 1, in the existing satellite mobile communication system, a trunking ground substation subsystem is arranged through an interface of a satellite terminal uplink ground gateway station, a ground substation uses the existing satellite conventional network access registration process like a satellite terminal, registers with a core network through a gateway station controller, enters an idle waiting state after success, and listens to a satellite single call paging channel and a trunking group call control channel, as shown in fig. 1;
the ground substation is provided with a satellite, a mobile public network, a local MESH and a user terminal interface, the ground substation registers with the mobile public network by the user identity besides registering with the core network of the satellite ground gateway station in the above manner, and enters an idle waiting state after success, and listens to the paging call of the mobile public network, as shown in figure 2;
after the ground substation is successful in network access, receiving satellite cluster air interface grouping configuration, wherein the satellite cluster grouping configuration is initiated by a satellite cluster grouping terminal, and after the grouping configuration is completed, the ground substation is configured with a satellite cluster name and a group number, for example, the satellite cluster name is GROUPa, and the group number is 17411912345; the ground substation uses, for example, a truncated group number of cpi=2 for binding with it;
the ground substation operation desk configures a substation user terminal white list, wherein the white list consists of all legal terminal users of the ground substation, and the substation user terminal number and the terminal priority are used as white list items; the ground substation also needs to configure wireless frequency points used by the UNI user terminal interface, and the frequency points at least comprise two: a main frequency point and a service frequency point.
The substation terminal configures a user terminal number, and the terminal number can be configured when the terminal leaves the factory; the terminal is also required to be configured with a main working frequency point and other available frequency point lists for connecting with the ground substation; when the ground substation is not reachable, the main frequency point is used as the work frequency point of the off-network direct connection. The substation terminal searches for the ground service substation according to the configuration list, as shown in fig. 5.
The substation terminal uses a terminal network access registration process through a substation air interface, registers and registers with a substation related control entity through a wireless channel covered by a ground substation, and after success (see network access state 4 of fig. 6), obtains a satellite cluster group name group for the current satellite cluster group number cpi=2 of the terminal of the substation and CPI and group name lists of other substation clusters by using a control plane high-level protocol Over Air Group Configuration Protocol (see fig. 3), and activates a terminal cluster list calling function. And then enters an idle waiting state to listen for call control channel signaling of the outstation TDM2 (see fig. 4).
Calling:
a certain satellite terminal in the same satellite cluster group initiates a cluster group call, uses TMSI obtained by the satellite terminal during satellite channel registration as a calling identification code, calls cluster number 17411912345 called GROUPa, and refers to a 'satellite terminal protocol stack implementation method' patent grant number CN 109257086B for a call flow; after the call is successful, all satellite terminals and ground substations of the group enter a satellite cluster group call service channel, and the cluster real-time voice and signaling are answered. After the local station receives the trunked call, it forwards the satellite trunked call to the substation terminal and establishes a call connection for the ground segment using Group Call Control Protocol (see fig. 3).
The calling satellite terminal presses PTT (Push To Talk) to speak and the voice is transmitted to the satellite ground station via the satellite trunking group call uplink traffic channel, where the ground station forwards the trunked voice. The local ground sub-station uses the called group number CPI=2 bound by GROUPa to forward the cluster call to the ground sub-station terminal, all user terminals configured with CPI=2 receive the cluster call forwarded by the sub-station, the calling identification code of the call is the single calling number of the satellite terminal initiator, the sub-station terminal answers the satellite call and voice media forwarded by the local station, and the numbers of the initiator and the talker are displayed.
After the satellite terminal finishes speaking, releasing the PTT to release the satellite uplink group call service channel, wherein the release flow is referred to a 'satellite terminal protocol stack implementation method' patent grant number CN 109257086B; after successful release, the group user receives the uplink idle signaling sent by the gateway station.
The local ground substation transmits the uplink idle signaling to the substation terminal, and the substation terminal stops voice playing. When the uplink channel of the satellite cluster group call is idle, all satellite users and substation user terminals participating in the group call can speak through pressing the PTT request; when the substation terminal presses down PTT, the substation agent applies for satellite cluster group call service channels and forwards voice;
the calling user uses the uplink disconnecting command to initiate disconnecting in the trunking voice group call service channel, the satellite gateway station sends the disconnecting command in the downlink direction of the group call service channel, and after receiving the downlink disconnecting command, all mobile terminals and ground substations in the channel leave the channel by themselves, return to the public control channel and enter an idle state to wait for the next call; after receiving the downlink disconnecting command of the satellite, each ground substation respectively transmits the disconnecting command to the substation terminals, and all the ground group member terminals enter an idle state after receiving the disconnecting command.
When the substation terminal in the network access state initiates the trunking call, the substation receives the terminal trunking call, and the call flow is repeated.
In the network access state, when the substation terminal initiates or receives a satellite, PSTN or PLMN telephone call, the control plane higher layer PSTN Call Control (see figure 3) protocol realizes telephone call connection, the ground substation adopts a satellite terminal telephone flow proxy to forward the call, the satellite terminal telephone flow refers to a 'satellite terminal protocol stack implementation method' patent grant number CN 109257086B, after the call is established, the ground substation uses a frequency resource allocation instruction to assign the substation terminal to a service frequency point configured by the substation to carry out satellite telephone duplex voice bidirectional forwarding through a substation terminal interface.
When a certain substation terminal completes PSTN call connection and then transfers to a service frequency point from a main frequency point to carry out voice duplex communication, other substation terminals enter a notification through or judgment through working mode according to resource assignment signaling and can temporarily work in a through call state without substation forwarding (see state 7 notification through and state 6 judgment through state of fig. 6); when the PSTN call is completed, the substation and the PSTN call terminal return to the main frequency point, and the substation indicates all the substation terminals to return to the network access state through broadcasting on the main frequency point TDM 2.
When the substation terminal is started and the service substation cannot be searched through frequency point searching, the terminal enters an off-network through working mode (see state 2 of fig. 6), and in the off-network through mode, the terminal cluster group call and the single call list are forbidden to be used, and the terminal PSTN telephone list and the telephone dial plate are forbidden to be used. The terminal can only make a through call with cpi=0.
When the substation terminal starts up, the service substation working frequency point is searched, when registering with the substation, the substation refuses to access to the network because the substation is not configured with the white list user of the terminal, the substation terminal is in a transit through mode (see state 5 of fig. 6), the terminal cluster group call and the single call list are forbidden to be used, and the terminal PSTN telephone list and the telephone dial plate are forbidden to be used. The terminal can only make a through-call with cpi=0 on TDM1, and the sub-station can forward the call through TDM2 for providing sub-station open through-call forwarding service for non-home terminal users in emergency.
The foregoing embodiments illustrate and describe the basic principles, principal features of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (10)
1. A satellite cluster ground substation subsystem, comprising a ground substation and a substation terminal;
the ground substation is communicated with the ground gateway station through a communication satellite channel, is communicated with a substation terminal through a wireless channel, and is communicated with the ground substation through a ground wireless interface.
2. The satellite trunking ground substation subsystem of claim 1 wherein the ground substation is configured with a plurality of directional networking communication interfaces including a north interface, a south interface, an east interface, and a west interface;
the north interface supports circuit domain service and packet domain service, and the ground substation is connected with the ground gateway station through the north interface;
the south interface is accessed to a substation terminal, other existing various ground trunking terminals, trunking base stations and radio stations by using a ground wireless channel;
the east interface supports circuit domain service and packet domain service, and the ground substation is accessed into the mobile public network through the east interface;
the Western interface is an MESH network interface, and the ground substations are connected with the local friend substations through the Western interface, so that the interconnection of the ground substations is realized.
3. The satellite trunking ground substation subsystem according to claim 2, wherein the ground substation is provided with a substation call control entity and a substation media processing entity;
the substation call control entity takes a southbound interface of a ground substation as a user network UNI interface, a northbound interface of the ground substation as a main network interconnection NNI interface, and an eastbound interface and a western interface of the ground substation as an auxiliary network interconnection NNI interface to carry out routing selection and exchange control of call signaling;
the substation media processing entity is responsible for the media exchange of the four directional interfaces.
4. A satellite trunked ground sub-station subsystem according to claim 3, characterized in that the terminal interface protocol of the system is in particular:
the substation terminal accesses a user network UNI interface of the ground substation based on the same-frequency duplex wireless channel to perform uplink signal access and downlink signal forwarding;
other users access a user network UNI interface of a ground substation by adopting the existing communication mode, and the ground substation provides satellite cluster networking communication based on a gateway;
the other users comprise a through mobile station adopting DMO mode to access the substation, a trunked base station adopting TMO mode to access the substation, and various ground radio stations adopting wireless channel mode to access the substation.
5. The satellite trunking ground substation subsystem according to claim 4, wherein the access of the user network UNI interface of the ground substation to the substation terminal uses an air interface protocol stack;
the air interface protocol stack comprises three layers of protocols: a physical layer, a data link layer, and a call control layer;
the air interface protocol stack includes a control plane for signaling or data transfer and a user plane for voice media transfer;
the high-level protocols of the control plane of the air interface protocol stack comprise an air interface loading group configuration data protocol, a telephone call control protocol, a cluster group call control protocol, a cluster single call control protocol, a direct mode call control protocol and a short message service control protocol.
6. The satellite trunking ground sub-station subsystem of claim 5 wherein the physical layer employs a PDT/DMR through mode co-frequency two-slot duplex radio interface, ground terminal transmissions employ slot one, and ground sub-station transmissions employ slot two;
when the substation terminal occupies the first time slot for transmission, two synchronous feature codes are adopted to distinguish signaling data and voice media on the first time slot;
the ground substation occupies the second time slot when transmitting, and adopts the other two synchronous feature codes to distinguish the signaling data and the voice media on the second time slot.
7. A method for implementing a terminal interface protocol of a system according to any one of claims 1 to 6, comprising the steps of:
step 1, a ground substation is accessed to the network based on a satellite cluster ground substation subsystem, receives satellite cluster air interface grouping configuration, and a legal substation terminal connected with the ground substation is configured with a user terminal number, and performs terminal access registration through a user network UNI interface;
step 2, if the substation terminal is successful in network access, the substation terminal enters an idle waiting state and listens to the telephone call and the trunking signaling call of the time slot I and the time slot II;
and step 3, if the access of the substation terminal is unsuccessful in the off-network through or the access of the substation terminal is successful in the judgment through or the notification through, the substation terminal listens to the trunking signaling through call of the time slot I and the time slot II.
8. The method for implementing the terminal interface protocol according to claim 7, wherein the substation terminal in step 1 performs network entry registration, specifically:
step 1-1, after the substation terminal is started, firstly searching and locking the current working frequency point of the ground substation, namely firstly checking a frequency point configuration list of the substation terminal, starting from a main frequency point, listening to broadcast on a time slot II of the frequency point, if the broadcast of the ground substation is not received over time, actively initiating inquiry on the time slot I until a response of the ground substation on the time slot II is received, locking the response frequency point, searching successfully, and turning to the step 1-2;
if the substation does not answer all the time, the main frequency point is shifted to enter an off-network straight-through state;
step 1-2, after the substation terminal locks the ground substation working frequency point, firstly listening to whether a channel time slot I is idle, and if the channel time slot I is occupied, backing to wait for idle; if the time slot I is idle, the time slot structure of the signaling synchronous feature code can be used for establishing the signaling for registering network access on the time slot I, after the substation terminal is registered for network access, the substation automatically loads the satellite cluster grouping configuration data air interface of the terminal, and the network access terminal display interface for completing grouping loading is automatically updated into the current ground substation satellite cluster and the local station cluster grouping configuration menu.
9. The method according to claim 7, wherein the substation terminal in step 2 listens to the phone call and the trunking signaling call in the first and second slots in the idle waiting state, and the substation terminal is separated from the idle waiting state when:
(1) The substation terminal receives telephone calls of the ground substation on the time slot two channels, and the substation terminal is switched into a telephone answering state, uses a telephone call control protocol and is switched into a PSTN called mode;
(2) The substation terminal receives cluster group call establishment signaling of a group number configured by the local station on a time slot II, and the substation terminal is switched into a cluster group call answering state, uses a cluster group call control protocol and is switched into a group call called mode;
(3) The substation terminal receives a cluster single call establishment signaling of a single call number configured by the substation terminal on a time slot II, and the substation terminal is switched to a cluster single call receiving state, and is switched to a single call called mode by using a cluster single call control protocol;
(4) The telephone call control protocol of the substation terminal initiates a satellite or PSTN telephone call on the first time slot, and the terminal is switched into a telephone calling mode;
(5) The trunking group call control protocol of the substation terminal initiates a trunking group call on the first time slot, the terminal is switched into a trunking group call state, and the trunking group call control protocol is used for switching into a trunking group call calling mode;
(6) The trunking single call control protocol of the substation terminal initiates a trunking single call on the time slot I, the terminal is switched to the trunking single call state, and the trunking single call control protocol is used to switch to the trunking single call calling mode.
10. The method according to claim 7, wherein the substation terminal in step 3 listens to the trunking signaling through call of the first slot and the second slot, and the substation terminal leaves the idle waiting state when:
(1) The substation terminal receives the cluster group call establishment signaling of the direct DM group number configured by the local machine on the time slot I or the time slot II, and the substation terminal interface displays that the cluster group is calling and automatically shifts to a called answering mode of a cluster direct protocol;
(2) The substation terminal initiates a trunking direct-call group call through a direct-mode call control protocol, and the terminal is switched into a trunking direct-call calling mode.
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