CN101944945B - Shipborne mobile base station and mobile communication system based on same - Google Patents
Shipborne mobile base station and mobile communication system based on same Download PDFInfo
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Abstract
The invention discloses a shipborne mobile base station and a mobile communication system based on the same in the technical field of wireless communication, which can provide common mobile communication service to ships in ocean-going tasks or in danger. The shipborne mobile base station comprises an antenna module, a radio frequency module, a base band module, a protocol conversion module and a power supply module, wherein the protocol conversion module comprises a first mobile communication data interface unit, a first data business differentiation unit, a first data processing unit and a first satellite communication data interface unit, which are sequentially connected. The mobile communication system based on the shipborne mobile base station comprises an overhead satellite air communication subsystem, a shipborne mobile base station communication subsystem and a ground mobile communication subsystem, wherein the shipborne mobile base station communication subsystem comprises the shipborne mobile base station connected with a shipborne satellite way station; and the ground mobile communication subsystem comprises a ground protocol converter connected with a satellite master station and a base station control device. The invention can ensure that the common mobile mobile communication between offshore operation personnel and ground personnel is realized.
Description
Technical field
The invention belongs to wireless communication technology field, relate in particular to a kind of boat-carrying mobile base station and based on the mobile communication system of boat-carrying mobile base station.
Background technology
Overocean communications has multiple means, comprises marisat system, VSAT (Very Small Aperture Terminals, miniature antenna ground station satellite communication system), VHF (Very High Frequency, VHF communication system) etc.But the terminal price of satellite communication means such as marine satellite and VSAT and communication cost costliness, and complicated operation are only used as marine emergency communication instrument.And VHF is subjected to the restriction of its working system, can't realize effectively butt joint with the land mobile terminal, carries out intercommunication on the specific channel at sea.
Be widely used in the middle of the offshore production life as the mobile phone of main periodic traffic instrument.At present, powerful macrocell base stations is installed in the many employings of the covering of marine movable signal on land.Base station in the GSM technical system scope can realize that in theory the signal of 35 kilometers marine site scopes covers, therefore, mobile phone upward signal power limited when distance is far away, communication quality can't ensure.3-G (Generation Three mobile communication system) such as WCDMA, CDMA2000, TD-SCDMA etc., because of the influence of its working frequency range and distinctive cell breath, coverage is more limited.For solving the restriction of terrestrial base station nautical signal coverage, can also adopt the mode that the boat-carrying repeater is installed at boats and ships, the terrestrial base station signal is amplified and relaying, reach expansion terrestrial base station coverage purpose.But adopt this mode, the boats and ships repeater must be in the terrestrial base station signal cover, the coverage of base station in case boats and ships clear the land, and can't work in the boats and ships repeater.Simultaneously, only amplify and relaying the terrestrial base station signal boats and ships repeater, can bring the excessive problem that can't absorb than high traffic of causing of single base station range.
Summary of the invention
At the communication issue that area, above-mentioned ocean produces, the invention provides a kind of boat-carrying mobile base station and based on the mobile communication system of boat-carrying mobile base station, for ship or the ship in danger of ocean operation provides the mobile communication service.
Technical scheme is, a kind of boat-carrying mobile base station, utilize existing boat-carrying satellite small station to connect the overhead satellites communication subsystem, and the land mobile communication subsystem by linking to each other with described overhead satellites communication subsystem, for portable terminal provides service, it is characterized in that described boat-carrying mobile base station comprises Anneta module, radio-frequency module, baseband module, protocol conversion module and supply module;
Described Anneta module links to each other with radio-frequency module, supply module respectively, is used for the signal of mobile terminal receive transmission and sends signal to portable terminal;
Described radio-frequency module links to each other with Anneta module, baseband module and supply module respectively, is used for realizing rf modulations;
Described baseband module links to each other with radio-frequency module, protocol conversion module and supply module respectively, is used for realizing baseband modulation;
Described protocol conversion module links to each other with supply module with baseband module, boat-carrying satellite small station respectively, is used for mobile data and satellite communications data conversion on the realization ship;
Described supply module links to each other with Anneta module, radio-frequency module, baseband module, protocol conversion module respectively, is used to Anneta module, radio-frequency module, the power supply of baseband module peace talks modular converter;
Described protocol conversion module comprises the first mobile data interface unit, the first data service discrimination unit, first data processing unit and the first satellite communications data interface unit that order links to each other;
The described first mobile data interface unit links to each other with baseband module, is used for receiving and sending mobile data;
The described first data service discrimination unit links to each other with first data processing unit with the first mobile data interface unit respectively, is used for the type of service of discrimination mobile data;
Described first data processing unit links to each other with the first satellite communications data interface unit with the first data service discrimination unit respectively, be used for the form according to satellite communications data, mobile data is unpacked and be packaged into satellite communications data after send to the first satellite communications data interface unit; Also be used for the form according to satellite communications data, extract the mobile data in the satellite communications data;
The described first satellite communications data interface unit links to each other with boat-carrying satellite small station, is used for receiving and sending satellite communications data.
Described protocol conversion module comprises that also first empty slot extracts and the insertion unit, described first empty slot extracts with the insertion unit and links to each other with first data processing unit with the first data service discrimination unit respectively, be used for before mobile data converts satellite communications data to, unappropriated empty slot when extracting the mobile data transmission, also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, unappropriated empty slot when inserting the mobile data transmission.
Described protocol conversion module comprises that also first idle frame filters and recovery unit, described first idle frame filters and links to each other with first data processing unit with the first data service discrimination unit respectively with recovery unit, be used for before mobile data converts satellite communications data to, idle frame in the identification mobile data, and the control mobile data only transmits the flag bit of idle frame; Also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, the flag bit of the idle frame in the identification mobile data, and behind the flag bit of idle frame, insert idle frame.
Described protocol conversion module also comprises first channel optimization and the reduction unit, the described first channel optimization links to each other with first data processing unit with the first data service discrimination unit respectively with reduction unit, be used for before mobile data converts satellite communications data to, will be assigned to a channel transmission at the signaling information of different channels transmission; Also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, will revert to the channel transmission at each signaling information place before transmitting at the signaling information of a channel transmission.
Described radio-frequency module also comprises the broadband combiner unit, is used for realizing the common mode processing.
A kind of mobile communication system based on the boat-carrying mobile base station comprises overhead satellites communication subsystem, boat-carrying mobile base station communication subsystem and land mobile communication subsystem, described overhead satellites communication subsystem comprises communication satellite, described boat-carrying mobile base station communication subsystem comprises boat-carrying satellite small station, described land mobile communication subsystem comprises satellite main website, base-station control apparatus and mobile switching centre, it is characterized in that described boat-carrying mobile base station communication subsystem also comprises the boat-carrying mobile base station that links to each other with boat-carrying satellite small station; Described land mobile communication subsystem also comprises the ground protocol converter, and described ground protocol converter links to each other with base-station control apparatus with the satellite main website respectively;
Described ground protocol converter comprises the second satellite communications data interface unit, second data processing unit, the second data service discrimination unit and the second mobile data interface unit that order links to each other; Be used for realizing ground mobile data and satellite communications data conversion;
The described second satellite communications data interface unit links to each other with the satellite main website, is used for receiving and sending satellite communications data;
Described second data processing unit links to each other with the second data service discrimination unit with the second satellite communications data interface unit respectively; Be used for the form according to satellite communications data, extract the mobile data in the satellite communications data; Also be used for the form according to satellite communications data, mobile data is unpacked and be packaged into satellite communications data after send to the second satellite communications data interface unit;
The described second data service discrimination unit links to each other with second data processing unit with the second mobile data interface unit respectively, is used for the type of service of discrimination mobile data;
The described second mobile data interface unit links to each other with base-station control apparatus, is used for receiving and sending mobile data.
Described ground protocol converter comprises that also second empty slot extracts and the insertion unit, described second empty slot extracts with the insertion unit and links to each other with second data processing unit with the second data service discrimination unit respectively, be used for after satellite communications data converts mobile data to unappropriated empty slot when inserting the mobile data transmission before the type of service of discrimination mobile data; Also be used for before mobile data converts satellite communications data to unappropriated empty slot when extracting the mobile data transmission.
Described protocol conversion module comprises that also second idle frame filters and recovery unit, described second idle frame filters and links to each other with second data processing unit with the second data service discrimination unit respectively with recovery unit, be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, the flag bit of the idle frame in the identification mobile data, and behind the flag bit of idle frame, insert idle frame; Also be used for before mobile data converts satellite communications data to, the idle frame in the identification mobile data, and the control mobile data only transmits the flag bit of idle frame.
Described protocol conversion module also comprises second channel optimization and reduction unit, described second channel optimization links to each other with second data processing unit with the second data service discrimination unit respectively with reduction unit, be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, will revert to the channel transmission at each signaling information place before transmitting at the signaling information of a channel transmission; Also be used for before mobile data converts satellite communications data to, will be assigned to a channel transmission at the signaling information of different channels transmission.
The present invention's communication system realization is via satellite docked with the land mobile communication network network, the covering of movable signal can be expanded to the marine site that satellite communication system can cover, the operation on the sea personnel only need use common mobile phone terminal can realize instant messaging, and communication is not subjected to any restriction of terrestrial base station, can also ensure enough telephone traffics when ensureing coverage.
Description of drawings
Fig. 1 is boat-carrying mobile base station structural representation;
Fig. 2 is the protocol conversion module structural representation of boat-carrying mobile base station;
Fig. 3 is the satellite communications data structural representation;
Fig. 4 is that schematic diagram is formed in the boat-carrying mobile base station;
Fig. 5 is based on the mobile communication system overall construction drawing of boat-carrying mobile base station;
Fig. 6 is the ground protocol converter structural representation of land mobile communication subsystem;
Fig. 7 is the another kind of structural representation of the protocol conversion module of boat-carrying mobile base station;
Fig. 8 is the another kind of structural representation of the ground protocol converter of land mobile communication subsystem.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
Fig. 1 is boat-carrying mobile base station structural representation, and among Fig. 1, the boat-carrying mobile base station comprises Anneta module, radio-frequency module, baseband module, protocol conversion module and supply module.
Anneta module links to each other with radio-frequency module, supply module respectively, is used for the signal of mobile terminal receive transmission and sends signal to portable terminal.
Radio-frequency module links to each other with Anneta module, baseband module and supply module respectively, is used for realizing rf modulations.
Baseband module links to each other with radio-frequency module, protocol conversion module and supply module respectively, is used for realizing baseband modulation.
Protocol conversion module links to each other with supply module with baseband module, boat-carrying satellite small station respectively, is used for mobile data and satellite communications data conversion on the realization ship.
Supply module links to each other with Anneta module, radio-frequency module, baseband module, protocol conversion module respectively, is used to Anneta module, radio-frequency module, the power supply of baseband module peace talks modular converter.
Fig. 2 is the protocol conversion module structural representation of boat-carrying mobile base station.Among Fig. 2, protocol conversion module comprises the first mobile data interface unit, the first data service discrimination unit, first data processing unit and the first satellite communications data interface unit that order links to each other.
The first mobile data interface unit links to each other with baseband module, is used for receiving and sending mobile data.
The first data service discrimination unit links to each other with first data processing unit with the first mobile data interface unit respectively, is used for the type of service of discrimination mobile data.The type of service of mobile data comprises the professional and Iub business of Abis, and the first data service discrimination unit mainly passes through the type of service of flag of frame position discrimination communication data.In the present invention, the purpose of discrimination type of service is, the opposite end is handled accordingly according to type of service.Such as, what marine mobile phone terminal user adopted is that the Abis type of service is called out terrestrial user, then the land mobile communication subsystem also should use identical type of service to handle this calling.
First data processing unit is the core of boat-carrying mobile base station, and its major function is to realize the conversion of mobile data and satellite communications data.First data processing unit links to each other with the first satellite communications data interface unit with the first data service discrimination unit respectively, be used for the form according to satellite communications data, mobile data is unpacked and be packaged into satellite communications data after send to the first satellite communications data interface unit; Also be used for the form according to satellite communications data, extract the mobile data in the satellite communications data.
With the current The data IP data instance of satellite, illustrate that first data processing unit carries out the principle of data transaction below.Fig. 3 is the satellite communications data structural representation.Among Fig. 3, the satellite The data IP data of passing through, the frame structure of IP data comprises ether header (accounting for 22 bytes), IP header (accounting for 20 bytes), UDP header (accounting for 8 bytes), control field (accounting for 4 bytes), bearer service field (be used for depositing subpackage after mobile data) and FCS (Frame Check Sequence accounts for 4 bytes).Wherein, control field is used for determining the length of bearer service field.Control field comprises: the load sign (type that is used for the expression load, account for the 4bit position), L (sync fail sign, account for the 1bit position), R (packet loss sign, account for the 1bit position), reserved word (all puts 0 under the obsolete situation, account for the 4bit position), the data length (length of expression control field and bearer service field, account for the 6bit position), sequence number (being used for controlling data packet disorder, the 16bit position).From the above-mentioned IP data frame structure as can be seen, the length of bearer service field is determined by the data length of control field.After the data length of control field was determined, mobile data was unpacked according to its length, and the bearer service field that the bag that will split into is put into the IP data can be finished encapsulation.After it is noted that mobile data is unpacked this moment, each bag that splits out has packet number, is used for wrapping reorganization when converting satellite communications data to mobile data.Mobile data sends to the first satellite communications data interface unit after sealing off and encapsulate and finishing, and by the overhead satellites communication subsystem, sends to the land mobile communication subsystem, finishes data and sends.
Otherwise, after the satellite communications data that the land mobile communication subsystem sends reached first data processing unit by the first satellite communications data interface unit, the data extract of storing in the bearer service field of first data processing unit with the IP data frame format was come out.These data that extract are packetized data, according to packet number, these data are recombinated according to the order of sequence, have just formed mobile data.After sending it to the first data service discrimination unit discrimination mobile communication data business type then, send to baseband module by the first mobile data interface unit, finish reception and the conversion of satellite communications data.
It is emphasized that the data of storing in the bearer service field of above-mentioned IP data frame format, also comprise the data after the optimization.Namely use first empty slot to extract and insert any one in unit, the first idle frame filtration and recovery unit or the first channel optimization and the reduction unit or when a plurality of, the data of storing in the bearer service field of IP data frame format should be through the data after the said units optimization when protocol conversion module of the present invention.
Among Fig. 2, the first satellite communications data interface unit links to each other with boat-carrying satellite small station, is used for receiving and sending satellite communications data.
Fig. 4 is that schematic diagram is formed in the boat-carrying mobile base station.Among Fig. 4, protocol conversion module connects GSM Base Band Unit and WCDMA Base Band Unit by the E1 circuit, and baseband module is finished the Base-Band Processing of business datum.The GSM Base Band Unit connects the GSM radio frequency unit by optical fiber, the WCDMA Base Band Unit also connects a WCDMA radio frequency unit and the 2nd WCDMA radio frequency unit by optical fiber, GSM radio frequency unit and a WCDMA radio frequency unit are connected to the broadband combiner unit by coaxial cable, realize the common mode processing of GSM and WCDMA, the 2nd WCDMA radio frequency unit directly connects directional antenna by coaxial cable, directional antenna satisfies anti-10 grades of typhoons, discharge water, protection from fumes, etch-proof three anti-standards, the signal that solves marine WCDMA covers.The broadband combiner unit connects ceiling mount antenna in a plurality of cabins by coaxial cable and coupler, solves the signal covering problem of interior each layer GSM of cabin and WCDMA.
The present invention utilizes satellite communication system carrying land mobile communication system, realizes the butt joint of boats and ships mobile base station and land mobile communication system.Fig. 5 is based on the mobile communication system overall construction drawing of boat-carrying mobile base station.Among Fig. 5, comprise overhead satellites communication subsystem, boat-carrying mobile base station communication subsystem and land mobile communication subsystem based on the mobile communication system of boat-carrying mobile base station.Wherein, the overhead satellites communication subsystem comprises communication satellite; Boat-carrying mobile base station communication subsystem comprises interconnective boat-carrying satellite small station and boat-carrying mobile base station; The land mobile communication subsystem comprises satellite main website, protocol converter, base-station control apparatus and the mobile switching centre that connects in turn.Mobile switching centre be linked into PSTN (Public Switched Telephone Network, PSTN) and Public Land Mobile Nerwork (Public Land Mobile Network, PLMN).
Fig. 6 is the ground protocol converter structural representation of land mobile communication subsystem.Among Fig. 6, described ground protocol converter comprises the second satellite communications data interface unit, second data processing unit, the second data service discrimination unit and the second mobile data interface unit that order links to each other; Be used for realizing ground mobile data and satellite communications data conversion.
The second satellite communications data interface unit links to each other with the satellite main website, is used for receiving and sending satellite communications data.
Second data processing unit is the core of ground protocol converter, and its major function is to realize the conversion of mobile data and satellite communications data.Second data processing unit links to each other with the second data service discrimination unit with the second satellite communications data interface unit respectively; Be used for the form according to satellite communications data, extract the mobile data in the satellite communications data; Also be used for the form according to satellite communications data, mobile data is unpacked and be packaged into satellite communications data after send to the second satellite communications data interface unit.Second data processing unit realizes that the transfer principle of mobile data and satellite communications data is identical with first data processing unit of the protocol conversion module of boat-carrying mobile base station, does not repeat them here.
But it should be emphasized that, realize in the conversion of mobile data and satellite communications data at second data processing unit that the data of storing in the bearer service field of IP data frame format also comprise the data after the optimization.Namely the protocol conversion module when boat-carrying of the present invention mobile base station uses first empty slot to extract and the insertion unit, in the first idle frame filtration and recovery unit or the first channel optimization and the reduction unit any one or when a plurality of, the ground protocol converter also should use second empty slot to extract accordingly and insert the unit, in the second idle frame filtration and recovery unit or second channel optimization and the reduction unit any one or a plurality of, at this moment, the data of storing in the bearer service field of IP data frame format should be to extract and the insertion unit through above-mentioned second empty slot, data after the second idle frame filtration and recovery unit or second channel optimization and reduction unit are optimized.
The second data service discrimination unit links to each other with second data processing unit with the second mobile data interface unit respectively, is used for the type of service of discrimination mobile data.
The second mobile data interface unit links to each other with base-station control apparatus, is used for receiving and sending mobile data.
Owing to limited by bandwidth by overhead satellites communication subsystem transmission data speed, and price is expensive, therefore in order to improve data transmission efficiency, in the present invention, optimization process can before converting satellite communications data to, mobile data be carried out, when satellite communications data converts mobile data to, reduce processing again, thereby improve the transmission speed of data in the satellite communication process, reduce data traffic, reduce cost.
Fig. 7 is the another kind of structural representation of the protocol conversion module of boat-carrying mobile base station.In the present invention, can increase by first empty slot and extract and insertion unit, the first idle frame filtration and recovery unit, first channel optimization and the reduction unit by in the protocol conversion module of boat-carrying mobile base station, realize optimization or the reduction of data.Wherein, the extraction of first empty slot is optimized data from different aspects respectively with insertion unit, the first idle frame filtration and recovery unit, the first channel optimization and reduction unit or reduces, these three Elementary Functions are relatively independent, can use simultaneously, also can only select one of them or two uses.Because these three Elementary Functions are relatively independent, so the annexation between them is unfixing, but should guarantee that these three unit all will be between first data industry discrimination unit and first data processing unit.In addition, when increasing the extraction of first empty slot in the protocol conversion module of boat-carrying mobile base station and inserting unit, the first idle frame filtration and recovery unit, the first channel optimization and reduction unit, accordingly, the ground protocol converter also will increase the extraction of second empty slot and insert unit, the second idle frame filtration and recovery unit, second channel optimization and reduction unit.
Among Fig. 7, used first empty slot to extract and insertion unit, the first idle frame filtration and recovery unit, first channel optimization and the reduction unit in the protocol conversion module of boat-carrying mobile base station.
Filtration links to each other with recovery unit the extraction of first empty slot with first idle frame with the first data service discrimination unit respectively with inserting the unit, is used for before mobile data converts satellite communications data to unappropriated empty slot when the extraction mobile data transmits.Also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, unappropriated empty slot when inserting the mobile data transmission.General terrestrial links are all transmitted 32 E1 time slots, take the bandwidth of 2.048Mb/s.When the E1 link does not use fully, a large amount of empty slots is arranged in transmission, transmit these empty slots the satellite communication bandwidth has been caused great waste, only otherwise launch these empty slots, for the satellite transmission, can save the bandwidth cost greatly." extractions " empty slot when sending data, when receiving data again with the empty slot " insertion " of " extraction ", then can conserve bandwidth, can guarantee the quality that satellite transmits again.Extract and insert the unit for first empty slot, " extractions " be the mobile data of mobile phone terminal transmission; And " insertion " is the data that receive and handle through first data processing unit from the land mobile communication subsystem.
First idle frame filters with recovery unit and links to each other with reduction unit with the first channel optimization with the insertion unit with the extraction of first empty slot respectively, be used for before mobile data converts satellite communications data to, idle frame in the identification mobile data, and the control mobile data only transmits the flag bit of idle frame.Also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, the flag bit of the idle frame in the identification mobile data, and behind the flag bit of idle frame, insert idle frame.In actual communication process, the opposing party often was in mute state when a side spoke.In order to improve mobile communication system capacity and service quality, reduce in the air and disturb, improve the useful life of battery, mobile communication system adopts discontinuous emission (DTX) technology usually.If a side is in mute state in this process, the Abis interface of mobile communication system and Iub interface can transmit and have SID (Silent Indicator, silence indicator) or the frame of BFI (Bad Frame Indicator bad frame identity) sign, these frames do not have actual vocoded information, only contain a spot of quiet parameter.Therefore, at transmitting terminal, only transmit necessary bit in the data transmission procedure and get final product; And receiving terminal recovers data by flag bit, can save a large amount of speech data bandwidth like this.
The first channel optimization links to each other with first data processing unit with recovery unit with the first idle frame filtration respectively with reduction unit, be used for before mobile data converts satellite communications data to, will be assigned to a channel transmission at the signaling information of different channels transmission.Also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, will revert to the channel transmission at each signaling information place before transmitting at the signaling information of a channel transmission.Abis interface and Iub interface in mobile communication system have defined the signalling time slots such as RSL, OML, and size and the telephone traffic of signalling time slot data volume are directly proportional.These signalings are handled grouping information such as conversation foundations, system monitoring in mobile communication system, when base station carrier do not join full fully and telephone traffic hour, the effective information that carries of these signalling time slots only takies the sub-fraction of distribution bandwidth.Though signaling information is grouped data, these time slots all distribute fixing TDM passage, therefore have to fill a large amount of idle bits.In order to reduce bandwidth occupancy, at transmitting terminal, can adopt the mode of multichannel statistic multiplexing to carry out channel optimization, a plurality of grouped channels are merged into a channel bearing; And at receiving terminal, carry out the recovery of channel reduction and handle.
Fig. 8 is the another kind of structural representation of the ground protocol converter of land mobile communication subsystem.When increasing the extraction of first empty slot in the protocol conversion module of boat-carrying mobile base station and inserting unit, the first idle frame filtration and recovery unit, the first channel optimization and reduction unit, accordingly, the ground protocol converter also will increase the extraction of second empty slot and insert unit, the second idle frame filtration and recovery unit, second channel optimization and reduction unit.The extraction of second empty slot is optimized data from different aspects respectively with insertion unit, the second idle frame filtration and recovery unit, second channel optimization and reduction unit or reduces, these three Elementary Functions are relatively independent, can use simultaneously, also can only select one of them or two uses.Because these three Elementary Functions are relatively independent, so the annexation between them is unfixing, but should guarantee that these three unit all will be between second data industry discrimination unit and second data processing unit.
Among Fig. 8, the ground protocol converter increases by second empty slot and extracts and insertion unit, the second idle frame filtration and recovery unit, second channel optimization and reduction unit.
Second empty slot extract with the operation principle of inserting unit, the second idle frame filtration and recovery unit, second channel optimization and reduction unit respectively and identical with reduction unit with their first empty slot extraction accordingly and insertion unit, the first idle frame filtration and recovery unit, the first channel optimization.Do not repeat them here.
The present invention can expand to the covering of movable signal the marine site that satellite communication system can cover, the operation on the sea personnel only need use common mobile phone terminal can realize instant messaging, and communication is not subjected to any restriction of terrestrial base station, can also ensure enough telephone traffics when ensureing coverage.Its application can be divided into public welfare and use and the commerciality application.Public welfare is used by at Government Ships such as maritime affairs, salvage, fish-farming operations the marine ships mobile base station being installed, and utilizes high-power exterior aerial to provide the mobile communication service for the operating personnel of surrounding waters; Commerciality is used and is mainly used in merchant navy vessels such as large-scale pleasure boat, ferry boat, cargo ship, by at these merchant navy vessels marine mobile base station being installed, provides the movable signal of the interior single-point of cabin or multiple spot to cover, and solves the periodic traffic needs that this boatman does personnel.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. boat-carrying mobile base station, utilize existing boat-carrying satellite small station to connect the overhead satellites communication subsystem, and the land mobile communication subsystem by linking to each other with described overhead satellites communication subsystem, for portable terminal provides service, it is characterized in that described boat-carrying mobile base station comprises Anneta module, radio-frequency module, baseband module, protocol conversion module and supply module;
Described Anneta module links to each other with radio-frequency module, supply module respectively, is used for the signal of mobile terminal receive transmission and sends signal to portable terminal;
Described radio-frequency module links to each other with Anneta module, baseband module and supply module respectively, is used for realizing rf modulations;
Described baseband module links to each other with radio-frequency module, protocol conversion module and supply module respectively, is used for realizing baseband modulation;
Described protocol conversion module links to each other with supply module with baseband module, boat-carrying satellite small station respectively, is used for mobile data and satellite communications data conversion on the realization ship;
Described supply module links to each other with Anneta module, radio-frequency module, baseband module, protocol conversion module respectively, is used to Anneta module, radio-frequency module, baseband module and protocol conversion module power supply;
Described protocol conversion module comprises the first mobile data interface unit, the first data service discrimination unit, first data processing unit and the first satellite communications data interface unit that order links to each other;
The described first mobile data interface unit links to each other with baseband module, is used for receiving and sending mobile data;
The described first data service discrimination unit links to each other with first data processing unit with the first mobile data interface unit respectively, is used for the type of service of discrimination mobile data;
Described first data processing unit links to each other with the first satellite communications data interface unit with the first data service discrimination unit respectively, be used for the form according to satellite communications data, mobile data is unpacked and be packaged into satellite communications data after send to the first satellite communications data interface unit; Also be used for the form according to satellite communications data, extract the mobile data in the satellite communications data;
The described first satellite communications data interface unit links to each other with boat-carrying satellite small station, is used for receiving and sending satellite communications data.
2. a kind of boat-carrying according to claim 1 mobile base station, it is characterized in that described protocol conversion module comprises that also first empty slot extracts and the insertion unit, described first empty slot extracts with the insertion unit and links to each other with first data processing unit with the first data service discrimination unit respectively, be used for before mobile data converts satellite communications data to, unappropriated empty slot when extracting the mobile data transmission, also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, unappropriated empty slot when inserting the mobile data transmission.
3. a kind of boat-carrying according to claim 1 mobile base station, it is characterized in that described protocol conversion module comprises that also first idle frame filters and recovery unit, described first idle frame filters and links to each other with first data processing unit with the first data service discrimination unit respectively with recovery unit, be used for before mobile data converts satellite communications data to, idle frame in the identification mobile data, and the control mobile data only transmits the flag bit of idle frame; Also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, the flag bit of the idle frame in the identification mobile data, and behind the flag bit of idle frame, insert idle frame.
4. a kind of boat-carrying according to claim 1 mobile base station, it is characterized in that described protocol conversion module also comprises first channel optimization and the reduction unit, the described first channel optimization links to each other with first data processing unit with the first data service discrimination unit respectively with reduction unit, be used for before mobile data converts satellite communications data to, adopt the mode of multichannel statistic multiplexing to carry out channel optimization, will be assigned to a channel transmission at the signaling information of different channels transmission; Also be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, will revert to the channel transmission at each signaling information place before transmitting at the signaling information of a channel transmission.
5. according to any described a kind of boat-carrying of claim mobile base station among the claim 1-4, it is characterized in that described radio-frequency module also comprises the broadband combiner unit, be used for realizing the common mode processing.
6. mobile communication system based on the boat-carrying mobile base station, comprise overhead satellites communication subsystem, boat-carrying mobile base station communication subsystem and land mobile communication subsystem, described overhead satellites communication subsystem comprises communication satellite, described boat-carrying mobile base station communication subsystem comprises boat-carrying satellite small station, described land mobile communication subsystem comprises satellite main website, base-station control apparatus and mobile switching centre, it is characterized in that described boat-carrying mobile base station communication subsystem also comprises the boat-carrying mobile base station that links to each other with boat-carrying satellite small station; Described land mobile communication subsystem also comprises the ground protocol converter, and described ground protocol converter links to each other with base-station control apparatus with the satellite main website respectively;
Described ground protocol converter comprises the second satellite communications data interface unit, second data processing unit, the second data service discrimination unit and the second mobile data interface unit that order links to each other; Be used for realizing ground mobile data and satellite communications data conversion;
The described second satellite communications data interface unit links to each other with the satellite main website, is used for receiving and sending satellite communications data;
Described second data processing unit links to each other with the second data service discrimination unit with the second satellite communications data interface unit respectively; Be used for the form according to satellite communications data, extract the mobile data in the satellite communications data; Also be used for the form according to satellite communications data, mobile data is unpacked and be packaged into satellite communications data after send to the second satellite communications data interface unit;
The described second data service discrimination unit links to each other with second data processing unit with the second mobile data interface unit respectively, is used for the type of service of discrimination mobile data;
The described second mobile data interface unit links to each other with base-station control apparatus, is used for receiving and sending mobile data.
7. a kind of mobile communication system based on the boat-carrying mobile base station according to claim 6, it is characterized in that described ground protocol converter comprises that also second empty slot extracts and the insertion unit, described second empty slot extracts with the insertion unit and links to each other with second data processing unit with the second data service discrimination unit respectively, be used for after satellite communications data converts mobile data to unappropriated empty slot when inserting the mobile data transmission before the type of service of discrimination mobile data; Also be used for before mobile data converts satellite communications data to unappropriated empty slot when extracting the mobile data transmission.
8. a kind of mobile communication system based on the boat-carrying mobile base station according to claim 6, it is characterized in that described protocol conversion module comprises that also second idle frame filters and recovery unit, described second idle frame filters and links to each other with second data processing unit with the second data service discrimination unit respectively with recovery unit, be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, the flag bit of the idle frame in the identification mobile data, and behind the flag bit of idle frame, insert idle frame; Also be used for before mobile data converts satellite communications data to, the idle frame in the identification mobile data, and the control mobile data only transmits the flag bit of idle frame.
9. a kind of mobile communication system based on the boat-carrying mobile base station according to claim 6, it is characterized in that described protocol conversion module also comprises second channel optimization and reduction unit, described second channel optimization links to each other with second data processing unit with the second data service discrimination unit respectively with reduction unit, be used for after satellite communications data converts mobile data to, before the type of service of discrimination mobile data, will revert to the channel transmission at each signaling information place before transmitting at the signaling information of a channel transmission; Also be used for before mobile data converts satellite communications data to, adopting the mode of multichannel statistic multiplexing to carry out channel optimization, will be assigned to a channel transmission at the signaling information of different channels transmission.
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