CN102916738B - Data reliable multicast method based on FDMA (frequency division multiple Access)/DAMA (demand assigned multiple access) satellite communication system - Google Patents
Data reliable multicast method based on FDMA (frequency division multiple Access)/DAMA (demand assigned multiple access) satellite communication system Download PDFInfo
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Abstract
The invention discloses a data reliable multicast method based on FDMA (frequency division multiple Access)/DAMA(demand assigned multiple access) satellite communication system. The data reliable multicast method based on FDMA/DAMA satellite communication system is applicable to a data transmission system of an FDMA/DAMA satellite communication network; aiming at the limited satellite communication system resources and the bidirectional broadcasting characteristics of a satellite, a communication flow combining multicast transmission and polling is provided, and the reliable and efficient satellite multicast transmission is realized.
Description
Technical field
A kind of open data reliable multicast method based on FDMA/DAMA (frequency division multiple access/distribution according to need) satellite communication system of the present invention, relate to technical field of satellite communication, be used in particular for solving the data reliable multicast transport problem in FDMA/DAMA satellite communication system.
Background technology
Along with the quickening of world information process, terrestrial interconnection net obtains develop rapidly, but tellurian most area does not also have communication network to cover.Compared with terrestrial communication networks, satellite communication network have wide coverage, broadcast-capable strong, limit few advantage by regional condition.Satellite network has received increasing concern both at home and abroad as supplementing and backing up of ground network, and following the Internet will be the integrated network of Incorporate.
When there is multiple reception user, utilizing multicast mode to carry out Information issued and effectively can save bandwidth, alleviating network burden.The special topological structure of satellite communication network determines it and has natural cast communication ability, but also has the inherent defects such as channel error code is high, Bandwidth-Constrained, link are asymmetric simultaneously.These shortcomings are set up for multicast group, Multicast Routing is found not too large impact, but in cast communication process, but had very large impact to reliable data transmission.The reliability how ensureing satellite multicast communication while giving full play to satellite broadcasting advantage is a current study hotspot.
FDMA/DAMA (frequency division multiple access/distribution according to need) is a kind of conventional satellite communication system.In FDMA/DAMA satellite communication network, satellite repeater frequency resource returns all ground stations in net publicly-owned, frequency channels is that central station distributes according to the apply by letter having the website of communication requirement to propose temporarily, that is, do not have the carrier wave of respective site during traffic transmission to be turn off, only have corresponding ground station when really needing to communicate just according to the allocation result busy channel of central station, to launch carrier wave, during sign off, central station reclaims frequency resource, and corresponding ground station closes corresponding carrier wave.Avoiding problems the situation of the long-term acquisition frequency resource of the website being in the communication idle phase, improve the utilization ratio of satellite channel, save the bandwidth sum power resource of satellite repeater.
Chinese scholars had had some to study to satellite reliable multicast technology, but these technology fail to carry out integrated design with concrete satellite communication system mostly, not strong to the adaptability of real system, the data reliable multicast method designed in conjunction with FDMA/DAMA communication system still belongs to blank.
Summary of the invention
FDMA/DAMA (frequency division multiple access/distribution according to need) satellite communication system and satellite reliable multicast technology is the object of the invention is to combine closely, solve data reliable multicast problem in the limited satellite communication system of frequency resource, a kind of data reliable multicast method based on FDMA/DAMA satellite communication system is provided.
The object of the present invention is achieved like this, a kind of data reliable multicast method based on FDMA/DAMA satellite communication system, described FDMA/DAMA satellite communication system comprises 1 central station and several remote terminals, central station is made up of multicast send server, network management center, switch, router, webmaster modulator-demodulator, business modulator-demodulator, each remote terminal is made up of data receiving terminal, OAMAgent, switch, router, webmaster modulator-demodulator, business modulator-demodulator, it is characterized in that comprising the following steps:
(1) the forward direction broadband multicast channel from central station to all remote terminals is set up, central station is cut into the packet of regular length file to be sent, dose check information and according to the order of sequence numbering after, by forward direction broadband multicast channel, give each remote terminal with multicast mode by the length of packet, number information and Packet Generation;
(2) after all remote terminals receive multicast packet, first verify, stored according to number order by the packet of verification; The packet of check errors is abandoned, and be numbered record and memory space reserved;
(3) after file is sent by central station, central station and remote terminal 1 set up point-to-point return path, and central station sends the order of transmission result queries by forward direction broadband multicast channel;
(4), after remote terminal 1 receives querying command, replied by the point-to-point return path transmission and reception successful respond between remote terminal 1 and central station or take defeat; If be the response that takes defeat, just by the packet numbers scope segmentation markers of unsuccessful reception in failed response packet;
(5) after central station receives the response from remote terminal 1, if successful respond, then the return path between remote terminal 1 and central station is removed, the end of file transfer of central station and remote terminal 1; If unsuccessfully reply, then central station is according to the number information of the packet received that fails marked in failed response packet, retransmits corresponding data bag with multicast mode;
(6) after retransmitting, central station re-starts inquiry to remote terminal 1, if what remote terminal 1 was responded is successful respond, then remove the return path between remote terminal 1 and central station, if remaining that remote terminal 1 is responded unsuccessfully is replied, then central station is retransmitted again, repeats the process of this step, until after reaching the number of retransmissions upper limit of setting, no matter whether transmission success, all remove the return path between remote terminal 1 and central station;
(7) repeat step (3), (4), (5) and (6), central station is inquired about successively to other all remote terminal;
(8), after central station is inquired about successively to all remote terminals, if all remote terminal all correctly receives all packets, then the forward direction broadband multicast channel from central station to remote terminal is removed, the end of transmission; If still have some remote terminal to fail entirely truely to receive all packets, then proceed to step (9) after removing the forward direction broadband multicast channel from central station to remote terminal;
(9) central station sets up point-to-point bi-directional transmission channel with the remote terminal failing correctly to receive entire packet respectively, in point-to-point mode by file transfer to remote terminal;
Complete the data reliable multicast based on FDMA/DAMA satellite communication system.
Wherein, the method for the forward direction broadband multicast channel of the foundation described in (1) step from central station to all remote terminals, comprises step:
(101) central station selects a modulator-demodulator as multicast sending modem under the control of network management center, arranges transmission centre carrier frequency and the transmission rate of multicast sending modem, and opens carrier wave transmit button;
(102) port be connected with multicast sending modem at central station router starts pim dm agreement, and enables igmp agreement this port is added object multicast address group;
(103) each remote terminal selects a modulator-demodulator as multicast reception modulator-demodulator under the control of our station OAMAgent, it is equal that the reception carrier centre frequency arranging multicast reception modulator-demodulator and central station multicast sending modem send centre carrier frequency, and the receiving velocity arranging multicast reception modulator-demodulator is equal with central station multicast sending modem transmission rate;
(104) port be connected with multicast reception modulator-demodulator at all remote terminal routers starts pim dm agreement, and place subnet of standing centered by the subnet adding an entry on remote terminal router, down hop port are the static routing of the port be connected with multicast reception modulator-demodulator;
Forward direction broadband multicast channel from central station to all remote terminals is set up complete.
Wherein, described in (2) step, record and the reserved method of memory space are numbered to the packet of check errors, comprise step:
(201) after remote terminal receives data packet length and number information, set up due-in package number list, and be multiplied by packet number with data packet length and calculate due-in file size, then open up one piece of spatial cache being of a size of due-in file size and prepare to receive file;
(202) remote terminal receives certain packet, first carries out verification checking to it; If verification is correct, just the useful data in packet is taken out, according to its Bale No., it is copied to the correspondence position of spatial cache, and the numbering of this packet is deleted from due-in package number list; If check errors, just by data packet discarding, and keep due-in package number list constant;
(203) after central station file is sent, if still have package number in the due-in package number list that remote terminal is corresponding with this file, so, just mean that this file is failed by entirely true reception, these numberings are exactly the package number be not correctly received.
Wherein, in step (9), if central station sends successfully to certain remote station to dot file, then remove the point-to-point bi-directional transmission channel between central station and this remote terminal; If central station sends unsuccessfully to certain remote station to dot file, then re-start point-to-point transmission after separated in time, until file finally sends successfully, remove the point-to-point bi-directional transmission channel between central station and this remote terminal, end of transmission.
The present invention compared with prior art has the following advantages:
Reliable multicast and FDMA/DAMA satellite communication system are combined closely by this technology, adopt the multicast routing protocol PIM-DM adapting to satellite one-way broadcast nature, devise the communication process that multicast combines with poll, achieve efficient satellite reliable multicast transport.
Accompanying drawing explanation
Fig. 1 is embodiments of the invention schematic diagrames.
Fig. 2 is the basic communication flow chart of Fig. 1.
Fig. 1 shows the preferred embodiments of the present invention, comprises 1 central station and several remote terminals.Central station is made up of multicast send server, network management center, switch, router, webmaster modulator-demodulator, business modulator-demodulator, and each remote terminal is made up of data receiving terminal, OAMAgent, switch, router, webmaster modulator-demodulator, business modulator-demodulator.Wherein:
Multicast send server is the multicast source sending data, for sending multicast packet to each remote terminal;
Data receiving terminal is for receiving the data sent from central station multicast send server;
Network management center is arranged in central station, can directly receive from central station inside link setup, tear chain request open, also can by webmaster modulator-demodulator receive from remote terminal link setup, tear chain request open, be responsible for distributing or release frequency resource, the opening and closing of control centre's station business modem carrier, and routers is configured;
OAMAgent is arranged in remote terminal, signaling communication is carried out by the network management center of webmaster modulator-demodulator and central station, link setup can be sent to central station, tear chain request open, also can control the opening and closing of our station business modem carrier according to the order of network management center, and routers is configured;
Webmaster modulator-demodulator is arranged in central station and remote terminal, is the transmission channel of signaling between network management center and OAMAgent;
Business modulator-demodulator is the passage of business data transmission, the multicast packet that central station multicast send server sends is sent to remote terminal by the passage of central station business modulator-demodulator and remote terminal business modulator-demodulator composition, and the opening and closing of business modem carrier are controlled by network management center and each remote terminal OAMAgent;
Router provides routing function for IP packet, and its configuration is controlled by network management center and OAMAgent;
Centered by switch, station or remote terminal provide data exchanging function in station.
Embodiment
Be described below in conjunction with accompanying drawing 1,2 pairs of the preferred embodiments of the present invention, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
The present invention includes step:
The object of the present invention is achieved like this, and a kind of data reliable multicast method based on FDMA/DAMA satellite communication system, is characterized in that comprising the following steps:
(1) the forward direction broadband multicast channel from central station to all remote terminals is set up, central station is cut into the packet of regular length file to be sent, dose check information and according to the order of sequence numbering after, by forward direction broadband multicast channel, give each remote terminal with multicast mode by the length of packet, number information and Packet Generation;
The forward direction broadband multicast channel set up from central station to all remote terminals specifically comprises step:
(101) central station selects a modulator-demodulator as multicast sending modem under the control of network management center, arranges transmission centre carrier frequency and the transmission rate of multicast sending modem, and opens carrier wave transmit button;
(102) port be connected with multicast sending modem at central station router starts pim dm agreement, and enables igmp agreement this port is added object multicast address group;
(103) each remote terminal selects a modulator-demodulator as multicast reception modulator-demodulator under the control of our station OAMAgent, it is equal that the reception carrier centre frequency arranging multicast reception modulator-demodulator and central station multicast sending modem send centre carrier frequency, and the receiving velocity arranging multicast reception modulator-demodulator is equal with central station multicast sending modem transmission rate;
(104) port be connected with multicast reception modulator-demodulator at all remote terminal routers starts pim dm agreement, and place subnet of standing centered by the subnet adding an entry on remote terminal router, down hop port are the static routing of the port be connected with multicast reception modulator-demodulator; Forward direction broadband multicast channel from central station to all remote terminals is set up complete;
(2) after all remote terminals receive multicast packet, first verify, stored according to number order by the packet of verification; The packet of check errors is abandoned, and be numbered record and memory space reserved, specifically comprise step:
(201) after remote terminal receives data packet length and number information, set up due-in package number list, and be multiplied by packet number with data packet length and calculate due-in file size, then open up one piece of spatial cache being of a size of due-in file size and prepare to receive file;
(202) remote terminal receives certain packet, first carries out verification checking to it; If verification is correct, just the useful data in packet is taken out, according to its Bale No., it is copied to the correspondence position of spatial cache, and the numbering of this packet is deleted from due-in package number list; If check errors, just by data packet discarding, and keep due-in package number list constant;
(203) after central station file is sent, if still have package number in the due-in package number list that remote terminal is corresponding with this file, so, just mean that this file is failed by entirely true reception, these numberings are exactly the package number be not correctly received;
(3) after file is sent by central station, central station and remote terminal set up point-to-point return path, and central station sends the order of transmission result queries by forward direction broadband multicast channel;
(4) after remote terminal receives querying command, by the point-to-point return path transmission and reception successful respond between remote terminal and central station or the response that takes defeat; If be the response that takes defeat, just by the packet numbers scope segmentation markers of unsuccessful reception in failed response packet;
(5) after central station receives the response from remote terminal, if successful respond, then the return path between this remote terminal and central station is removed, the end of file transfer of central station and this remote terminal; If unsuccessfully reply, then central station is according to the number information of the packet received that fails marked in failed response packet, retransmits corresponding data bag with multicast mode;
(6) after retransmitting, central station re-starts inquiry to this remote terminal, if what this remote terminal was responded is successful respond, then remove the return path between this remote terminal and central station, if remaining that this remote terminal is responded unsuccessfully is replied, then central station is retransmitted again, repeats the process of this step, until after reaching the number of retransmissions upper limit of setting, no matter whether transmission success, all remove the return path between this remote terminal and central station;
(7) repeat step (3), (4), (5) and (6), central station is inquired about successively to other all remote terminal;
(8), after central station is inquired about successively to all remote terminals, if all remote terminal all correctly receives all packets, then the forward direction broadband multicast channel from central station to remote terminal is removed, the end of transmission; If still have some remote terminal to fail entirely truely to receive all packets, then proceed to step (9) after removing the forward direction broadband multicast channel from central station to remote terminal;
(9) central station sets up point-to-point bi-directional transmission channel with the remote terminal failing correctly to receive entire packet respectively, in point-to-point mode by file transfer to remote terminal; If central station sends successfully to certain remote station to dot file, then remove the point-to-point bi-directional transmission channel between central station and this remote terminal; If central station sends unsuccessfully to certain remote station to dot file, then re-start point-to-point transmission after separated in time, until file finally sends successfully, remove the point-to-point bi-directional transmission channel between central station and this remote terminal, complete the data reliable multicast based on FDMA/DAMA satellite communication system.
Those having ordinary skill in the art will appreciate that: the data reliable multicast method realized based on FDMA/DAMA satellite communication system can have been come by the relevant hardware of program command or software, this program, when performing, performs the step comprising said method embodiment.
Claims (4)
1. the data reliable multicast method based on FDMA/DAMA satellite communication system, described FDMA/DAMA satellite communication system comprises 1 central station and several remote terminals, central station is made up of multicast send server, network management center, switch, router, webmaster modulator-demodulator, business modulator-demodulator, each remote terminal is made up of data receiving terminal, OAMAgent, switch, router, webmaster modulator-demodulator, business modulator-demodulator, it is characterized in that comprising the following steps:
(1) the forward direction broadband multicast channel from central station to all remote terminals is set up, central station is cut into the packet of regular length file to be sent, dose check information and according to the order of sequence numbering after, by forward direction broadband multicast channel, give each remote terminal with multicast mode by the length of packet, number information and Packet Generation;
(2) after all remote terminals receive multicast packet, first verify, stored according to number order by the packet of verification; The packet of check errors is abandoned, and be numbered record and memory space reserved;
(3) after file is sent by central station, central station and remote terminal 1 set up point-to-point return path, and central station sends the order of transmission result queries by forward direction broadband multicast channel;
(4), after remote terminal 1 receives querying command, replied by the point-to-point return path transmission and reception successful respond between remote terminal 1 and central station or take defeat; If be the response that takes defeat, just by the packet numbers scope segmentation markers of unsuccessful reception in failed response packet;
(5) after central station receives the response from remote terminal 1, if successful respond, then the return path between remote terminal 1 and central station is removed, the end of file transfer of central station and remote terminal 1; If unsuccessfully reply, then central station is according to the number information of the packet received that fails marked in failed response packet, retransmits corresponding data bag with multicast mode;
(6) after retransmitting, central station re-starts inquiry to remote terminal 1, if what remote terminal 1 was responded is successful respond, then remove the return path between remote terminal 1 and central station, if remaining that remote terminal 1 is responded unsuccessfully is replied, then central station is retransmitted again, repeats the process of this step, until after reaching the number of retransmissions upper limit of setting, no matter whether transmission success, all remove the return path between remote terminal 1 and central station;
(7) repeat step (3), (4), (5) and (6), central station is inquired about successively to other all remote terminal;
(8), after central station is inquired about successively to all remote terminals, if all remote terminal all correctly receives all packets, then the forward direction broadband multicast channel from central station to remote terminal is removed, the end of transmission; If still have some remote terminal to fail entirely truely to receive all packets, then proceed to step (9) after removing the forward direction broadband multicast channel from central station to remote terminal;
(9) central station sets up point-to-point bi-directional transmission channel with the remote terminal failing correctly to receive entire packet respectively, in point-to-point mode by file transfer to remote terminal;
Complete the data reliable multicast based on FDMA/DAMA satellite communication system.
2. a kind of data reliable multicast method based on FDMA/DAMA satellite communication system according to claim 1, it is characterized in that: the method for the forward direction broadband multicast channel of the foundation described in (1) step from central station to all remote terminals, comprises step:
(101) central station selects a modulator-demodulator as multicast sending modem under the control of network management center, arranges transmission centre carrier frequency and the transmission rate of multicast sending modem, and opens carrier wave transmit button;
(102) port be connected with multicast sending modem at central station router starts pim dm agreement, and enables igmp agreement this port is added object multicast address group;
(103) each remote terminal selects a modulator-demodulator as multicast reception modulator-demodulator under the control of our station OAMAgent, it is equal that the reception carrier centre frequency arranging multicast reception modulator-demodulator and central station multicast sending modem send centre carrier frequency, and the receiving velocity arranging multicast reception modulator-demodulator is equal with central station multicast sending modem transmission rate;
(104) port be connected with multicast reception modulator-demodulator at all remote terminal routers starts pim dm agreement, and place subnet of standing centered by the subnet adding an entry on remote terminal router, down hop port are the static routing of the port be connected with multicast reception modulator-demodulator;
Forward direction broadband multicast channel from central station to all remote terminals is set up complete.
3. a kind of data reliable multicast method based on FDMA/DAMA satellite communication system according to claim 1, it is characterized in that: described in (2) step, record and the reserved method of memory space are numbered to the packet of check errors, comprise step:
(201) after remote terminal receives data packet length and number information, set up due-in package number list, and be multiplied by packet number with data packet length and calculate due-in file size, then open up one piece of spatial cache being of a size of due-in file size and prepare to receive file;
(202) remote terminal receives certain packet, first carries out verification checking to it; If verification is correct, just the useful data in packet is taken out, according to its Bale No., it is copied to the correspondence position of spatial cache, and the numbering of this packet is deleted from due-in package number list; If check errors, just by data packet discarding, and keep due-in package number list constant;
(203) after central station file is sent, if still have package number in the due-in package number list that remote terminal is corresponding with this file, so, just mean that this file is failed by entirely true reception, these numberings are exactly the package number be not correctly received.
4. a kind of data reliable multicast method based on FDMA/DAMA satellite communication system according to claim 1, it is characterized in that: in step (9), if central station sends successfully to certain remote station to dot file, then remove the point-to-point bi-directional transmission channel between central station and this remote terminal; If central station sends unsuccessfully to certain remote station to dot file, then re-start point-to-point transmission after separated in time, until file finally sends successfully, remove the point-to-point bi-directional transmission channel between central station and this remote terminal, end of transmission.
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| CN108134965B (en) * | 2018-01-23 | 2020-09-01 | 重庆大学 | Method for wireless side group broadcast transmission of order broadcasting service |
| CN110768708B (en) * | 2018-07-27 | 2021-08-06 | 清华大学 | Multicast method, server and terminal based on communication satellite |
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