CN102916738A - 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
The present invention discloses a kind of data reliable multicast method based on FDMA/DAMA (frequency division multiple access/distribution according to need) satellite communication system, relate to technical field of satellite communication, be used in particular for solving the data reliable multicast transport problem in the FDMA/DAMA satellite communication system.
Background technology
Along with the quickening of world's IT application process, the terrestrial interconnection net has obtained develop rapidly, but tellurian most areas does not also have communication network to cover.Compare with the ground communication network, satellite communication network have wide coverage, broadcast-capable strong, be subjected to the few advantage of regional condition restriction.Satellite network has been subjected to increasing concern the both at home and abroad as replenishing and backing up of ground network, and following the Internet will be the integrated network of Incorporate.
In the situation that has a plurality of reception users, utilize multicast mode to carry out the information issue and can effectively save bandwidth, alleviate network burden.The special topological structure of satellite communication network has determined that it has natural cast communication ability, but also has simultaneously the inherent defects such as channel error code height, Bandwidth-Constrained, link be asymmetric.These shortcomings are sought not too large impact for multicast group foundation, Multicast Routing, but in the cast communication process, the data transmitting are but had very large impact.How to guarantee when giving full play to the satellite broadcasting advantage that the reliability of satellite multicast communication is a present study hotspot.
FDMA/DAMA (frequency division multiple access/distribution according to need) is a kind of satellite communication system commonly used.In the FDMA/DAMA satellite communication network, the satellite repeater frequency resource returns interior all ground stations of net publicly-owned, frequency channels is that central station distributes according to the apply by letter of the website proposition that communication requirement is arranged temporarily, that is to say, the carrier wave of respective site does not turn-off when having the communication service transmission, and corresponding ground station launches carrier wave just according to the allocation result busy channel of central station when only having real need to communication, central station reclaims frequency resource during sign off, and corresponding ground station closes corresponding carrier wave.The situation that this has just been avoided being in the long-term acquisition frequency resource of website of communication idle periods has improved the utilization ratio of satellite channel, has saved bandwidth and the power resource of satellite repeater.
Chinese scholars had had some researchs to satellite reliable multicast technology, but these technology fail to carry out integrated design with concrete satellite communication system mostly, adaptability to real system is not strong, and it is blank that the data reliable multicast method that designs in conjunction with the FDMA/DAMA communication system still belongs to.
Summary of the invention
The object of the invention is to FDMA/DAMA (frequency division multiple access/distribution according to need) satellite communication system and satellite reliable multicast technology are combined closely, solve data reliable multicast problem in the limited satellite communication system of frequency resource, a kind of data reliable multicast method based on the 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 the FDMA/DAMA satellite communication system, described FDMA/DAMA satellite communication system comprises 1 central station and several remote terminals, central station is comprised of multicast send server, network management center, switch, router, webmaster modulator-demodulator, professional modulator-demodulator, each remote terminal is comprised of data receiving terminal, OAMAgent, switch, router, webmaster modulator-demodulator, professional modulator-demodulator, it is characterized in that may further comprise the steps:
(1) the forward direction broadband multicast channel of foundation from central station to all remote terminals, central station is cut into file to be sent the packet of regular length, dose check information and according to the order of sequence the numbering after, by forward direction broadband multicast channel, give each remote terminal with multicast mode with length, number information and the Packet Generation of packet;
(2) after all remote terminals are received multicast packet, at first carry out verification, store according to number order by the packet of verification; Packet to check errors is abandoned, and is numbered record and memory space reservation;
(3) after central station was sent file, central station and remote terminal 1 were 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 is received querying command, send and receive successful respond or take defeat by the point-to-point return path between remote terminal 1 and the central station and reply; If reply for taking defeat, just incite somebody to action the packet numbers scope segmentation markers of success reception in failed response packet;
(5) central station receives from after the replying of remote terminal 1, if successful respond is then removed the return path between remote terminal 1 and the central station, and the end of file transfer of central station and remote terminal 1; If unsuccessfully reply, then central station is retransmitted the corresponding data bag according to the number information of the packet of the reception that fails of mark in the failed response packet with multicast mode;
(6) retransmit complete rear center station remote terminal 1 is re-started inquiry, if what remote terminal 1 was responded is successful respond, then remove the return path between remote terminal 1 and the central station, if the failure that remains that remote terminal 1 is responded 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 the central station;
(7) repeating step (3), (4), (5) and (6), central station is inquired about successively to other all remote terminals;
(8) central station to all remote terminals inquire about successively complete after, if all remote terminal all correctly receives all packets, then remove the forward direction broadband multicast channel from the central station to the remote terminal, the end of transmission; If still have some remote terminal to fail entirely true all packets that receive, change step (9) over to after then removing the forward direction broadband multicast channel from the central station to the remote terminal;
(9) central station is set up point-to-point transmitted in both directions channel with the remote terminal of failing correctly to receive entire packet respectively, in point-to-point mode with file transfer to remote terminal;
Finish the data reliable multicast based on the FDMA/DAMA satellite communication system.
Wherein, the method for the forward direction broadband multicast channel of foundation from central station to all remote terminals described in (1) step comprises step:
(101) central station selects a modulator-demodulator as the multicast sending modem under the control of network management center, transmission centre carrier frequency and the transmission rate of multicast sending modem is set, and opens the carrier wave transmit button;
(102) port that links to each other with the multicast sending modem at the central station router starts pim dm agreement, and enables the igmp agreement with this port adding purpose multicast address group;
(103) each remote terminal selects a modulator-demodulator as the multicast receiving modem under the control of our station OAMAgent, the reception carrier centre frequency that the multicast receiving modem is set sends centre carrier frequency with central station multicast sending modem and equates that the receiving velocity that the multicast receiving modem is set equates with central station multicast sending modem transmission rate;
(104) port that links to each other with the multicast receiving modem at all remote terminal routers starts pim dm agreement, and adds the static routing that place, station subnet centered by the subnet of clauses and subclauses, down hop port are the port that links to each other with the multicast receiving modem at the remote terminal router;
Forward direction broadband multicast channel from central station to all remote terminals is set up complete.
Wherein, the packet to check errors described in (2) step is numbered the method for record and memory space reservation, comprises step:
(201) after remote terminal is received data packet length and number information, set up due-in package number tabulation, and multiply by the packet number with data packet length and calculate due-in file size, then open up a spatial cache that is of a size of due-in file size and prepare to receive file;
(202) remote terminal is received certain packet, at first it is carried out the verification checking; If verification is correct, just the useful data in the 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 tabulation; If check errors just with data packet discarding, and keeps due-in package number tabulation constant;
(203) after the central station file is sent, if the due-in package number that remote terminal is corresponding with this document still has package number in tabulating, so, just mean that this document fails by entirely true reception, these numberings are exactly the package number that is not correctly received.
Wherein, in step (9), if central station sends successfully dot file to certain remote station, then remove the point-to-point transmitted in both directions channel between central station and this remote terminal; If central station sends unsuccessfully dot file to certain remote station, then re-start point-to-point transmission behind the certain hour of interval, until after file finally sends successfully, remove the point-to-point transmitted in both directions channel between central station and this remote terminal, end of transmission.
The present invention compared with prior art has the following advantages:
This technology is combined closely reliable multicast and FDMA/DAMA satellite communication system, adopts the multicast routing protocol PIM-DM that adapts to satellite One-to-All Broadcast characteristic, has designed the communication process that multicast combines with poll, has realized efficient satellite reliable multicast transport.
Description of drawings
Fig. 1 is the 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 comprised of multicast send server, network management center, switch, router, webmaster modulator-demodulator, professional modulator-demodulator, and each remote terminal is comprised of data receiving terminal, OAMAgent, switch, router, webmaster modulator-demodulator, professional modulator-demodulator.Wherein:
Multicast send server is the multicast source that sends data, is used for sending multicast packet to each remote terminal;
Data receiving terminal is used for receiving the data of sending from the central station multicast send server;
Network management center is arranged in central station, can directly receive link setup from central station inside, tear the chain request open, also can receive link setup from remote terminal, tear the chain request open by the webmaster modulator-demodulator, be responsible for distributing or discharging frequency resource, the stand opening and closing of professional modem carrier of control centre, and router is configured;
OAMAgent is arranged in remote terminal, network management center by webmaster modulator-demodulator and central station carries out the signaling communication, can send link setup to central station, tear the chain request open, also can control according to the order of network management center the opening and closing of the professional modem carrier of our station, and router is configured;
The webmaster modulator-demodulator is arranged in central station and remote terminal, is the transmission channel of signaling between network management center and the OAMAgent;
Professional modulator-demodulator is the passage of business data transmission, the multicast packet that the central station multicast send server sends is sent to remote terminal by the passage that the professional modulator-demodulator of central station and the professional modulator-demodulator of remote terminal form, and the opening and closing of professional modem carrier are by network management center and the control of each remote terminal OAMAgent;
Router provides routing function for the IP packet, and its configuration is by network management center and OAMAgent control;
Station or remote terminal provide data exchanging function in the station centered by the switch.
Embodiment
Describe 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 only is used for description and interpretation 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 the FDMA/DAMA satellite communication system is characterized in that may further comprise the steps:
(1) the forward direction broadband multicast channel of foundation from central station to all remote terminals, central station is cut into file to be sent the packet of regular length, dose check information and according to the order of sequence the numbering after, by forward direction broadband multicast channel, give each remote terminal with multicast mode with length, number information and the Packet Generation of packet;
The forward direction broadband multicast channel of foundation from central station to all remote terminals specifically comprises step:
(101) central station selects a modulator-demodulator as the multicast sending modem under the control of network management center, transmission centre carrier frequency and the transmission rate of multicast sending modem is set, and opens the carrier wave transmit button;
(102) port that links to each other with the multicast sending modem at the central station router starts pim dm agreement, and enables the igmp agreement with this port adding purpose multicast address group;
(103) each remote terminal selects a modulator-demodulator as the multicast receiving modem under the control of our station OAMAgent, the reception carrier centre frequency that the multicast receiving modem is set sends centre carrier frequency with central station multicast sending modem and equates that the receiving velocity that the multicast receiving modem is set equates with central station multicast sending modem transmission rate;
(104) port that links to each other with the multicast receiving modem at all remote terminal routers starts pim dm agreement, and adds the static routing that place, station subnet centered by the subnet of clauses and subclauses, down hop port are the port that links to each other with the multicast receiving modem at the remote terminal router; Forward direction broadband multicast channel from central station to all remote terminals is set up complete;
(2) after all remote terminals are received multicast packet, at first carry out verification, store according to number order by the packet of verification; Packet to check errors is abandoned, and is numbered record and memory space reservation, specifically comprises step:
(201) after remote terminal is received data packet length and number information, set up due-in package number tabulation, and multiply by the packet number with data packet length and calculate due-in file size, then open up a spatial cache that is of a size of due-in file size and prepare to receive file;
(202) remote terminal is received certain packet, at first it is carried out the verification checking; If verification is correct, just the useful data in the 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 tabulation; If check errors just with data packet discarding, and keeps due-in package number tabulation constant;
(203) after the central station file is sent, if the due-in package number that remote terminal is corresponding with this document still has package number in tabulating, so, just mean that this document fails by entirely true reception, these numberings are exactly the package number that is not correctly received;
(3) after central station was sent file, central station and remote terminal were 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 is received querying command, send and receive successful respond or take defeat by the point-to-point return path between remote terminal and the central station and reply; If reply for taking defeat, just incite somebody to action the packet numbers scope segmentation markers of success reception in failed response packet;
(5) central station receives from after the replying of remote terminal, if successful respond is then removed the return path between this remote terminal and the central station, the end of file transfer of central station and this remote terminal; If unsuccessfully reply, then central station is retransmitted the corresponding data bag according to the number information of the packet of the reception that fails of mark in the failed response packet with multicast mode;
(6) retransmit complete rear center station this remote terminal is re-started inquiry, if what this remote terminal was responded is successful respond, then remove the return path between this remote terminal and the central station, if the failure that remains that this remote terminal is responded 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 the central station;
(7) repeating step (3), (4), (5) and (6), central station is inquired about successively to other all remote terminals;
(8) central station to all remote terminals inquire about successively complete after, if all remote terminal all correctly receives all packets, then remove the forward direction broadband multicast channel from the central station to the remote terminal, the end of transmission; If still have some remote terminal to fail entirely true all packets that receive, change step (9) over to after then removing the forward direction broadband multicast channel from the central station to the remote terminal;
(9) central station is set up point-to-point transmitted in both directions channel with the remote terminal of failing correctly to receive entire packet respectively, in point-to-point mode with file transfer to remote terminal; If central station sends successfully dot file to certain remote station, then remove the point-to-point transmitted in both directions channel between central station and this remote terminal; If central station sends unsuccessfully dot file to certain remote station, then re-start point-to-point transmission behind the certain hour of interval, until after file finally sends successfully, remove the point-to-point transmitted in both directions channel between central station and this remote terminal, finish the data reliable multicast based on the FDMA/DAMA satellite communication system.
Those having ordinary skill in the art will appreciate that: realize to finish by program command relevant hardware or software based on the data reliable multicast method of FDMA/DAMA satellite communication system, this program is carried out the step that comprises said method embodiment when carrying out.
Claims (4)
1. data reliable multicast method based on the FDMA/DAMA satellite communication system, described FDMA/DAMA satellite communication system comprises 1 central station and several remote terminals, central station is comprised of multicast send server, network management center, switch, router, webmaster modulator-demodulator, professional modulator-demodulator, each remote terminal is comprised of data receiving terminal, OAMAgent, switch, router, webmaster modulator-demodulator, professional modulator-demodulator, it is characterized in that may further comprise the steps:
(1) the forward direction broadband multicast channel of foundation from central station to all remote terminals, central station is cut into file to be sent the packet of regular length, dose check information and according to the order of sequence the numbering after, by forward direction broadband multicast channel, give each remote terminal with multicast mode with length, number information and the Packet Generation of packet;
(2) after all remote terminals are received multicast packet, at first carry out verification, store according to number order by the packet of verification; Packet to check errors is abandoned, and is numbered record and memory space reservation;
(3) after central station was sent file, central station and remote terminal 1 were 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 is received querying command, send and receive successful respond or take defeat by the point-to-point return path between remote terminal 1 and the central station and reply; If reply for taking defeat, just incite somebody to action the packet numbers scope segmentation markers of success reception in failed response packet;
(5) central station receives from after the replying of remote terminal 1, if successful respond is then removed the return path between remote terminal 1 and the central station, and the end of file transfer of central station and remote terminal 1; If unsuccessfully reply, then central station is retransmitted the corresponding data bag according to the number information of the packet of the reception that fails of mark in the failed response packet with multicast mode;
(6) retransmit complete rear center station remote terminal 1 is re-started inquiry, if what remote terminal 1 was responded is successful respond, then remove the return path between remote terminal 1 and the central station, if the failure that remains that remote terminal 1 is responded 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 the central station;
(7) repeating step (3), (4), (5) and (6), central station is inquired about successively to other all remote terminals;
(8) central station to all remote terminals inquire about successively complete after, if all remote terminal all correctly receives all packets, then remove the forward direction broadband multicast channel from the central station to the remote terminal, the end of transmission; If still have some remote terminal to fail entirely true all packets that receive, change step (9) over to after then removing the forward direction broadband multicast channel from the central station to the remote terminal;
(9) central station is set up point-to-point transmitted in both directions channel with the remote terminal of failing correctly to receive entire packet respectively, in point-to-point mode with file transfer to remote terminal;
Finish the data reliable multicast based on the FDMA/DAMA satellite communication system.
2. a kind of data reliable multicast method based on the FDMA/DAMA satellite communication system according to claim 1, it is characterized in that: the method for the forward direction broadband multicast channel of foundation from central station to all remote terminals described in (1) step comprises step:
(101) central station selects a modulator-demodulator as the multicast sending modem under the control of network management center, transmission centre carrier frequency and the transmission rate of multicast sending modem is set, and opens the carrier wave transmit button;
(102) port that links to each other with the multicast sending modem at the central station router starts pim dm agreement, and enables the igmp agreement with this port adding purpose multicast address group;
(103) each remote terminal selects a modulator-demodulator as the multicast receiving modem under the control of our station OAMAgent, the reception carrier centre frequency that the multicast receiving modem is set sends centre carrier frequency with central station multicast sending modem and equates that the receiving velocity that the multicast receiving modem is set equates with central station multicast sending modem transmission rate;
(104) port that links to each other with the multicast receiving modem at all remote terminal routers starts pim dm agreement, and adds the static routing that place, station subnet centered by the subnet of clauses and subclauses, down hop port are the port that links to each other with the multicast receiving modem at the remote terminal router;
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 the FDMA/DAMA satellite communication system according to claim 1, it is characterized in that: the packet to check errors described in (2) step is numbered the method for record and memory space reservation, comprises step:
(201) after remote terminal is received data packet length and number information, set up due-in package number tabulation, and multiply by the packet number with data packet length and calculate due-in file size, then open up a spatial cache that is of a size of due-in file size and prepare to receive file;
(202) remote terminal is received certain packet, at first it is carried out the verification checking; If verification is correct, just the useful data in the 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 tabulation; If check errors just with data packet discarding, and keeps due-in package number tabulation constant;
(203) after the central station file is sent, if the due-in package number that remote terminal is corresponding with this document still has package number in tabulating, so, just mean that this document fails by entirely true reception, these numberings are exactly the package number that is not correctly received.
4. a kind of data reliable multicast method based on the FDMA/DAMA satellite communication system according to claim 1, it is characterized in that: in step (9), if central station sends successfully dot file to certain remote station, then remove the point-to-point transmitted in both directions channel between central station and this remote terminal; If central station sends unsuccessfully dot file to certain remote station, then re-start point-to-point transmission behind the certain hour of interval, until after file finally sends successfully, remove the point-to-point transmitted in both directions channel between central station and this remote terminal, end of transmission.
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