CN106603202A - Satellite link transmission method, system and gateway - Google Patents
Satellite link transmission method, system and gateway Download PDFInfo
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- CN106603202A CN106603202A CN201611050235.7A CN201611050235A CN106603202A CN 106603202 A CN106603202 A CN 106603202A CN 201611050235 A CN201611050235 A CN 201611050235A CN 106603202 A CN106603202 A CN 106603202A
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- gateway
- ack messages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
Abstract
The invention discloses a satellite link transmission method, system and gateway, and belongs to the field of communication technologies. The system comprises a source host, a source gateway, a target gateway and a target host, wherein the source gateway and the target gateway are connected by virtue of a satellite link; the source gateway is used for transmitting a first ACK (Acknowledgement) message taking the target host as a source end to the source host when a data message transmitted by the source host is received, and the data message is used for requesting service data from the target host; the source gateway is also used for transmitting the data message to the target gateway by virtue of a satellite link; the target gateway is used for judging whether to transmit an ACK message to the source gateway or not when the data message is received; when the data message is the data message received through the satellite link, the ACK message is judged not to be transmitted to the source gateway; the target gateway is also used for transmitting the data message to the target host; and the target gateway is also used for receiving a second ACK message transmitted by the target host, and deleting the second ACK message, and the second ACK message is an ACK message transmitted nu the target host to the source host.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of satellite link transmission method, system and gateway.
Background technology
In recent years, satellite communication with its wide coverage, broadcast-capable it is strong, do not limited by various geographical terrain conditions, group
The features such as net is flexibly and construction speed is fast, play an important role in wireless communications.In demand of the China to satellite resource
It is continuously increased, the fusion of communication, high bandwidth, Large Copacity, Onboard switching technology and multiple business network between star has become and defends
The important directions of star Communication Development.
Transmission control protocol/Internet Protocol (Transmission Control Protocol/Internet
Protocol, abbreviation TCP/IP) concept of agreement comes across the seventies, and rapid development and perfect has been obtained in the eighties,
The nineties, ICP/IP protocol has been established for the leading position in data communication protocol, is to be developed so far most successful communication
Agreement, in being widely used in various types of networks.
Transmission Control Protocol is designed for low speed ground network, and it adopts the mechanism such as response confirmation, slow turn-on, re-transmission,
Ground network environment is well adapted to.However, when carrying out TCP traffic data transfer on high speed satellite link, due to defending
The factors such as the high bit-error of star channel, long delay and transceiver channel asymmetry can cause the reduction of protocol efficiency, particularly
Impact of the satellite channel time delay to Transmission Control Protocol performance is the most obvious, and it causes channel utilization very low, it is impossible to makes full use of and defends
The effective bandwidth of star channel.
Therefore, how in the case of compatible existing satellite communication system so that Transmission Control Protocol can improve channel resource
Utilization rate, the performance to maximum performance system becomes urgent problem.
The content of the invention
In order to solve problem of the prior art, embodiments provide a kind of satellite link transmission method, system and
Gateway.The technical scheme is as follows：
In a first aspect, embodiments providing a kind of satellite link Transmission system, the system includes：Source host,
Source gateway, intended gateway and destination host, the source gateway and the intended gateway are connected by satellite link；
The source gateway is used for when the data message of source host transmission is received, and sends with target master to the source host
, used as an ACK messages of source, the data message is for the destination host requested service data for machine；
The source gateway is additionally operable to send the data message to intended gateway by satellite link；
The intended gateway is used for when the data message is received, and judges whether to send ACK messages；When the data
When message is the data message received by the satellite link, judgement does not send ACK messages；
The intended gateway is additionally operable to send the data message to the destination host；
The intended gateway is additionally operable to receive the 2nd ACK messages that the destination host sends, and deletes the 2nd ACK
Message, the 2nd ACK messages are the ACK messages that the destination host is sent to the source host.
In a kind of implementation of the embodiment of the present invention, the intended gateway is additionally operable to receiving the destination host
After the 2nd ACK messages for sending, the ID of the data message that the 2nd ACK messages confirm is recorded.
In another kind of implementation of the embodiment of the present invention, the intended gateway is additionally operable to periodically to the source net
Close and send notice message, the notice message includes the ID of at least one confirmed data message；
The source gateway removes the ID correspondences of the data message in the notice message after the notice message is received
Data message.
In another kind of implementation of the embodiment of the present invention, the source gateway is used to determine institute according to the data message
State the data message destination host to be sent to；Determine the data message whether by satellite link according to the destination host
It is transmitted；When the data message needs to be transmitted by satellite link, send with destination host work to the source host
For an ACK messages of source.
Second aspect, the embodiment of the present invention additionally provides a kind of satellite link transport gateway, and the gateway includes：
Receiver module, for when the data message of source host transmission is received, sending with target master to the source host
, used as an ACK messages of source, the data message is for the destination host requested service data for machine；
Judge module, for when the data message is received, judging whether to send ACK messages；When the datagram
When text is the data message received by the satellite link, judgement does not send ACK messages；
Sending module, for sending the data message to the destination host；
The receiver module, is additionally operable to receive the 2nd ACK messages that the destination host sends, the 2nd ACK messages
It is ACK messages that the destination host is sent to the source host.
Processing module, for deleting the 2nd ACK messages.
In a kind of implementation of the embodiment of the present invention, the processing module is additionally operable to receiving the destination host
After the 2nd ACK messages for sending, the ID of the data message that the 2nd ACK messages confirm is recorded.
The sending module, is additionally operable to periodically send notice message to the source gateway, and the notice message includes
The ID of at least one confirmed data message, so that the source gateway is after the notice message is received, removes described logical
Know the corresponding data messages of ID of the data message in message.
The third aspect, the embodiment of the present invention additionally provides a kind of satellite link transmission method, and methods described includes：
Source gateway is sent using destination host as source when the data message of source host transmission is received to the source host
The first ACK messages at end, the data message is used for the destination host requested service data；
The source gateway sends the data message by satellite link to intended gateway；
The intended gateway judges whether to send ACK messages when the data message is received；When the data message
When being the data message received by the satellite link, judgement does not send ACK messages；
The intended gateway to the destination host sends the data message；
The intended gateway receives the 2nd ACK messages that the destination host sends, and deletes the 2nd ACK messages,
The 2nd ACK messages are the ACK messages that the destination host is sent to the source host.
In a kind of implementation of the embodiment of the present invention, methods described also includes：
The intended gateway records the 2nd ACK messages after the 2nd ACK messages that the destination host sends are received
The ID of the data message of confirmation.
In another kind of implementation of the embodiment of the present invention, methods described also includes：
The intended gateway periodically sends notice message to the source gateway, and the notice message includes at least one
The ID of confirmed data message；
The source gateway removes the ID correspondences of the data message in the notice message after the notice message is received
Data message.
It is described to send using destination host as source to the source host in another kind of implementation of the embodiment of the present invention
The first ACK messages at end, including：
The source gateway determines the data message destination host to be sent to according to the data message；
The source gateway determines whether the data message is transmitted by satellite link according to the destination host；
When the data message needs to be transmitted by satellite link, the source gateway to the source host is sent with mesh
An ACK message of the mark main frame as source.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
By receiving when needing the data message sent by satellite link of source host transmission in source gateway, directly to source
Main frame sends ACK messages, when intended gateway is when the data message is received, because the data message is by satellite link
Transmission, so not sending ACK messages to source gateway, and when the 2nd ACK messages of destination host transmission are received, delete second
ACK messages.In due to above-mentioned transmitting procedure, it is not necessary to when destination host is received and confirmed by after data message, then to source host
ACK messages are sent, but ACK messages are directly sent to source host from source gateway so that source host is reported in the ACK for receiving source gateway
Wen Hou, it is believed that previously sent data message has smoothly reached destination host, thus can immediately send follow-up data message, from
And eliminate the impact of long delay channel.In addition, intended gateway does not send ACK messages, a side by satellite link to source gateway
The process resource of intended gateway and source gateway has been saved in face, has on the other hand saved satellite link resource.
Description of the drawings
Technical scheme in order to be illustrated more clearly that the embodiment of the present invention, below will be to making needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, can be obtaining other according to these accompanying drawings
Accompanying drawing.
Figure 1A is a kind of structural representation of satellite link Transmission system provided in an embodiment of the present invention；
Figure 1B is a kind of illustraton of model of satellite link Transmission system provided in an embodiment of the present invention；
Fig. 2 is a kind of structural representation of satellite link transport gateway provided in an embodiment of the present invention；
Fig. 3 is a kind of flow chart of satellite link transmission method provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Figure 1A is a kind of structural representation of satellite link Transmission system provided in an embodiment of the present invention, referring to Figure 1A, should
System includes：Source host 100, source gateway 101, intended gateway 201 and destination host 200.Wherein, source host 100 and source gateway
101 refer to transmission end main frame and gateway, and intended gateway 201 and destination host 200 refer to reception end main frame and gateway；Different
In transmitting procedure same main frame (gateway) be probably source host (gateway) be also likely to be destination host (gateway).
Wherein, source host 100 and source gateway 101 are connected by terrestrial links, and destination host 200 and intended gateway 201 are logical
Terrestrial links connection is crossed, source gateway 101 and intended gateway 201 are connected by satellite link, and satellite link includes the He of source gateway 101
Link between telecommunication satellite 300 and the link between intended gateway 201 and telecommunication satellite 300.Source host 100 adopts standard
Transmission Control Protocol carries out data transmission with source gateway 101, and source gateway 101 is carried out data transmission using deception TCP with source host 100, mesh
Mark gateway 201 is carried out data transmission using return link bandwidth control with source gateway 101, and destination host 200 is assisted using standard TCP
View carries out data transmission with intended gateway 201.
Source gateway 101 is used for when the data message of the transmission of source host 100 is received, and sends with target to source host 100
Main frame 200 confirms (Acknowledgement, abbreviation ACK) message as the first of source, and data message is used for destination host
200 requested service data (such as video traffic etc. is to the high data for requiring packet loss low business of delay requirement).Source gateway
101 are additionally operable to be sent datagram to intended gateway 201 by satellite link.Intended gateway 201 is used to receive datagram
Wen Shi, judges whether to send ACK messages；When data message is the data message received by satellite link, judgement is not sent out
Send ACK messages (return link bandwidth control technology).Intended gateway 201 is additionally operable to be sent datagram to destination host 200.Mesh
Mark gateway 201 is additionally operable to receive the 2nd ACK messages that destination host 200 sends, and deletes the 2nd ACK messages, the 2nd ACK messages
It is ACK messages that destination host 200 is sent to source host 100, for the data message for acknowledging receipt of.
Wherein, data message needs to carry source and purpose client information, in order to the smooth transmission of data message, wherein source
Client information generally includes source mark (Identifier, abbreviation ID) and address etc..
The present invention by source gateway receive source host transmission need by satellite link send data message when, directly
Connect to source host and send ACK messages, when intended gateway is when the data message is received, because the data message is by defending
Star link transmission, so not sending ACK messages to source gateway, and when the 2nd ACK messages of destination host transmission are received, delete
Except the 2nd ACK messages.In due to above-mentioned transmitting procedure, it is not necessary to when destination host is received and confirmed by after data message, then to
Source host sends ACK messages, but directly sends ACK messages to source host from source gateway so that source host is receiving source gateway
ACK messages after, it is believed that previously sent data message has smoothly reached destination host, thus can immediately send follow-up data
Message, so as to eliminate the impact of long delay channel.In addition, intended gateway does not send ACK reports by satellite link to source gateway
Text, has on the one hand saved the process resource of intended gateway and source gateway, has on the other hand saved satellite link resource.
Figure 1B is the tcp/ip layer time model schematic of the system, wherein, source host 100 and destination host 200 are still
Transmitted using standard TCP protocol, the Transmission Control Protocol of intended gateway 201 and source gateway 101 is modified, source gateway 101 is adopted and taken advantage of
TCP technologies are deceived, intended gateway 201 adopts return link bandwidth control technology.In said system, source host and destination host
Still transmitted using standard TCP protocol, it is not necessary to change main frame, repair also without the protocol stack and application program to main frame
Change, therefore compatibility is good, and system design cost can be reduced.
Specifically, source gateway 101 is used to determine the data message destination host to be sent to according to data message
200；Determine whether data message is transmitted by satellite link according to destination host 200；When data message is needed by defending
Stellar chain road is transmitted, and to source host 100 the ACK messages using destination host 200 as source are sent.
Source gateway 101 generates an ACK messages using TCP deceptions.The data that source gateway 101 sends according to source host 100
The address information of Receive message destination host 200, then generates an ACK messages according to the address information of destination host 200.
Further, source gateway 101 is additionally operable to store the data message being transmitted by satellite link, specifically can deposit
Storage is in the caching of source gateway 101.
Further, intended gateway 201 is used for when data message is not the data message received by satellite link,
Judge to send ACK messages.
That is, in embodiments of the present invention, intended gateway 201 and source gateway 101 are connected by satellite link,
As long as so receiving the data message of the transmission of source gateway 101, not sending ACK messages.And work as intended gateway 201 and receive other
It is that gateway or main frame send and when not being the data message sent by satellite link, ACK messages are sent to the gateway or main frame,
The ACK messages can be that intended gateway 201 is generated by TCP deceptions or (is not limited to preceding aim main frame from destination host
200) receive.
In a kind of implementation of the embodiment of the present invention, intended gateway 201 is subtracted using return link bandwidth control technology
Lack the message on reverse link, specifically intended gateway 201 is additionally operable to receiving the 2nd ACK messages that destination host 200 sends
Afterwards, the ID of the data message that the 2nd ACK messages confirm is recorded.
Intended gateway 201 is additionally operable to periodically send notice message to source gateway 101, and notice message includes fixed
The ID of data message.
Correspondingly, source gateway 101 is after notice message is received, and the ID of the data message in removing notice message is corresponding
Data message, to discharge caching.
The timing of intended gateway 201 to source gateway 101 sends notice message, notifies that source gateway 101 removes confirmed data
Message, release caching, while substantially reducing occupancy of the ACK messages to reverse return path (from intended gateway to source gateway).
Specifically, source gateway 101 obtains the ID of data message according to notice message；Search corresponding with the ID of data message
Data message；The data message that removing finds.
Further, intended gateway 201 is additionally operable to record the data message of the ACK messages for not receiving destination host 200
ID.
Intended gateway 201 is additionally operable to be sent to source gateway 101 and retransmits message, and retransmitting message includes not receiving destination host
The ID of the data message of 200 ACK messages.
Source gateway 101 receive retransmit message after, the corresponding data messages of the ID of searching data message from caching, and
Resend to intended gateway 201.The data message for receiving is sent to destination host 200 by intended gateway 201.
Fig. 2 is a kind of structural representation of satellite link transport gateway provided in an embodiment of the present invention, referring to Fig. 2, the net
Pass includes：Receiver module 21, judge module 22, sending module 23 and processing module 24.
When the gateway is used as intended gateway, receiver module 21, for receive source host transmission data message when,
The ACK messages using destination host as source are sent to source host, data message is used for destination host requested service number
According to；Judge module 22, for when data message is received, judging whether to send ACK messages to source gateway；When data message is
During the data message received by satellite link, judge not send ACK messages to source gateway；Sending module 23, for mesh
Mark main frame sends datagram；Receiver module 21, is additionally operable to receive the 2nd ACK messages that destination host sends, the 2nd ACK messages
It is ACK messages that destination host is sent to source host；Processing module 24, for deleting the 2nd ACK messages.
In a kind of implementation of the embodiment of the present invention, processing module 24 is additionally operable to receiving destination host sends the
After two ACK messages, the ID of the data message that the 2nd ACK messages confirm is recorded.
Sending module 23, is additionally operable to periodically send notice message to source gateway, and notice message has included at least one
The ID of the data message of confirmation, so that source gateway is after notice message is received, removes the ID of the data message in notice message
Corresponding data message.
Further, processing module 24 is additionally operable to record the ID of the data message for not receiving ACK messages.
Sending module 23, is additionally operable to send re-transmission message to source gateway, and retransmitting message includes not receiving the number of ACK messages
According to the ID of message.
Further, judge module 22, for when data message is not the data message received by satellite link,
Judge to send ACK messages.
That is, in embodiments of the present invention, intended gateway and source gateway are connected by satellite link, so only
The data message of source gateway transmission is received, ACK messages are not sent.And work as intended gateway and receive other gateways or main frame
It is sending and when not being the data message sent by satellite link, ACK messages are sent to the gateway or main frame, the ACK messages can
So that to be intended gateway generated by TCP deceptions or is received from destination host (being not limited to preceding aim main frame).
When gateway of the gateway as source, processing module 24, for receive source host transmission data message when,
An ACK messages using destination host as source are sent to source host by sending module 23.
Specifically, processing module 24 is additionally operable to determine the data message target master to be sent to according to data message
Machine；Determine whether data message is transmitted by satellite link according to destination host；When data message is needed by satellite chain
Road is transmitted, and the ACK messages using destination host as source are sent to source host by sending module 23.
Processing module 24 generates an ACK messages using TCP deceptions.The datagram that processing module 24 sends according to source host
Text obtains the address information of destination host, then generates an ACK messages according to the address information of destination host.
Further, processing module 24 is additionally operable to store the data message that is transmitted by satellite link, specifically can be with
Storage is in the buffer.
Further, receiver module 21 is additionally operable to receive the re-transmission message that intended gateway sends, and retransmitting message includes target
Gateway does not receive the ID of the data message of the ACK messages of destination host；Processing module 24 is postponed after re-transmission message is received
Middle lookup data message corresponding with the ID of data message is deposited, and is sent to intended gateway again.
The present invention by source gateway receive source host transmission need by satellite link send data message when, directly
Connect to source host and send ACK messages, when intended gateway is when the data message is received, because the data message is by defending
Star link transmission, so not sending ACK messages to source gateway, and when the 2nd ACK messages of destination host transmission are received, delete
Except the 2nd ACK messages.In due to above-mentioned transmitting procedure, it is not necessary to when destination host is received and confirmed by after data message, then to
Source host sends ACK messages, but directly sends ACK messages to source host from source gateway so that source host is receiving source gateway
ACK messages after, it is believed that previously sent data message has smoothly reached destination host, thus can immediately send follow-up data
Message, so as to eliminate the impact of long delay channel.In addition, intended gateway does not send ACK reports by satellite link to source gateway
Text, has on the one hand saved the process resource of intended gateway and source gateway, has on the other hand saved satellite link resource.
Fig. 3 is a kind of flow chart of satellite link transmission method provided in an embodiment of the present invention, referring to Fig. 3, the method bag
Include：
Step 301：Source gateway is sent with destination host work when the data message of source host transmission is received to source host
For an ACK messages of source, data message is for destination host requested service data.
In a kind of possible implementation, source gateway sends the ACK using destination host as source to source host
Message, including：Source gateway determines the data message destination host to be sent to according to data message.Source gateway is according to target
Main frame determines whether data message is transmitted by satellite link.When data message needs to be transmitted by satellite link,
Source gateway sends the ACK messages using destination host as source to source host.
Source gateway generates an ACK messages using TCP deceptions.Source gateway obtains mesh according to the data message that source host sends
The address information of mark main frame, then generates an ACK messages according to the address information of destination host.
Further, source gateway is additionally operable to store the data message being transmitted by satellite link, specifically can store
In the caching of source gateway.
Step 302：Source gateway is sent datagram by satellite link to intended gateway.
Step 303：Intended gateway judges whether to send ACK messages when data message is received；When data message is logical
When crossing the data message that satellite link is received, judgement does not send ACK messages.
Further, when data message is not the data message received by satellite link, judge to send ACK reports
Text.
That is, in embodiments of the present invention, intended gateway and source gateway are connected by satellite link, so only
The data message of source gateway transmission is received, ACK messages are not sent.And work as intended gateway and receive other gateways or main frame
It is sending and when not being the data message sent by satellite link, ACK messages are sent to the gateway or main frame, the ACK messages can
So that to be intended gateway generated by TCP deceptions or is received from destination host (being not limited to preceding aim main frame).
When data message is not the data message received by satellite link, judge to send ACK messages.
Step 304：Intended gateway to destination host sends datagram.
Step 305：Intended gateway receives the 2nd ACK messages that destination host sends, and the 2nd ACK messages are that destination host is sent out
Give the ACK messages of source host.
Step 306：Intended gateway records the ID of the data message that the 2nd ACK messages confirm.
Step 307：Intended gateway deletes the 2nd ACK messages.
Step 308：Intended gateway periodically sends notice message to source gateway, and notice message includes that at least one is true
The ID of the data message recognized.
Wherein, the transmission cycle can be determined according to the frequency of the data message for receiving, for example often receive predetermined number
Data message when send notice message.Predetermined number can be designed according to actual conditions, and such as 100.
Step 309：Source gateway removes the corresponding numbers of ID of the data message in notice message after notice message is received
According to message.
Specifically, source gateway obtains the ID of data message according to notice message；Search number corresponding with the ID of data message
According to message；The data message that removing finds.
Further, intended gateway is additionally operable to the ID of the data message for recording the ACK messages for not receiving destination host.
Intended gateway is additionally operable to be sent to source gateway and retransmits message, and retransmitting message includes not receiving the ACK of destination host
The ID of the data message of message.
After re-transmission message is received, the corresponding data messages of the ID of searching data message, lay equal stress on source gateway from caching
Newly it is sent to intended gateway.The data message for receiving is sent to destination host by intended gateway.
The present invention by source gateway receive source host transmission need by satellite link send data message when, directly
Connect to source host and send ACK messages, when intended gateway is when the data message is received, because the data message is by defending
Star link transmission, so not sending ACK messages to source gateway, and when the 2nd ACK messages of destination host transmission are received, delete
Except the 2nd ACK messages.In due to above-mentioned transmitting procedure, it is not necessary to when destination host is received and confirmed by after data message, then to
Source host sends ACK messages, but directly sends ACK messages to source host from source gateway so that source host is receiving source gateway
ACK messages after, it is believed that previously sent data message has smoothly reached destination host, thus can immediately send follow-up data
Message, so as to eliminate the impact of long delay channel.In addition, intended gateway does not send ACK reports by satellite link to source gateway
Text, has on the one hand saved the process resource of intended gateway and source gateway, has on the other hand saved satellite link resource.
One of ordinary skill in the art will appreciate that realizing all or part of step of above-described embodiment can pass through hardware
To complete, it is also possible to which the hardware that correlation is instructed by program is completed, and described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (10)
1. a kind of satellite link Transmission system, the system includes：Source host, source gateway, intended gateway and destination host, it is described
Source gateway and the intended gateway are connected by satellite link；
Characterized in that, the source gateway is used to, when the data message of source host transmission is received, send to the source host
Confirm ACK messages using destination host as the first of source, the data message is used for the destination host requested service number
According to；
The source gateway is additionally operable to send the data message to intended gateway by satellite link；
The intended gateway is used for when the data message is received, and judges whether to send ACK messages；When the data message
When being the data message received by the satellite link, judgement does not send ACK messages；
The intended gateway is additionally operable to send the data message to the destination host；
The intended gateway is additionally operable to receive the 2nd ACK messages that the destination host sends, and deletes the 2nd ACK reports
Text, the 2nd ACK messages are the ACK messages that the destination host is sent to the source host.
2. system according to claim 1, it is characterised in that the intended gateway is additionally operable to receiving the destination host
After the 2nd ACK messages for sending, mark ID of the data message that the 2nd ACK messages confirm is recorded.
3. system according to claim 2, it is characterised in that the intended gateway is additionally operable to periodically to the source net
Close and send notice message, the notice message includes the ID of at least one confirmed data message；
The source gateway removes the corresponding numbers of ID of the data message in the notice message after the notice message is received
According to message.
4. the system according to any one of claims 1 to 3, it is characterised in that the source gateway is used for according to the data
Message determines the data message destination host to be sent to；Determine whether the data message leads to according to the destination host
Cross satellite link to be transmitted；When the data message needs to be transmitted by satellite link, to the source host send with
An ACK message of the destination host as source.
5. a kind of satellite link transport gateway, it is characterised in that the gateway includes：
Receiver module, for when the data message of source host transmission is received, sending with destination host work to the source host
For an ACK messages of source, the data message is for the destination host requested service data；
Judge module, for when the data message is received, judging whether to send ACK messages；When the data message is
During the data message received by the satellite link, judgement does not send ACK messages；
Sending module, for sending the data message to the destination host；
The receiver module, is additionally operable to receive the 2nd ACK messages that the destination host sends, and the 2nd ACK messages are institutes
State the ACK messages that destination host is sent to the source host.
Processing module, for deleting the 2nd ACK messages.
6. gateway according to claim 5, it is characterised in that the processing module is additionally operable to receiving the destination host
After the 2nd ACK messages for sending, the ID of the data message that the 2nd ACK messages confirm is recorded.
The sending module, is additionally operable to periodically send notice message to the source gateway, and the notice message is included at least
The ID of one confirmed data message, so that the source gateway is after the notice message is received, removes the notice report
The corresponding data messages of ID of the data message in text.
7. a kind of satellite link transmission method, it is characterised in that methods described includes：
Source gateway is sent using destination host as source when the data message of source host transmission is received to the source host
First ACK messages, the data message is used for the destination host requested service data；
The source gateway sends the data message by satellite link to intended gateway；
The intended gateway judges whether to send ACK messages when the data message is received；When the data message is logical
When crossing the data message that the satellite link is received, judgement does not send ACK messages；
The intended gateway to the destination host sends the data message；
The intended gateway receives the 2nd ACK messages that the destination host sends, and deletes the 2nd ACK messages, described
2nd ACK messages are the ACK messages that the destination host is sent to the source host.
8. method according to claim 7, it is characterised in that methods described also includes：
The intended gateway records the 2nd ACK messages and confirms after the 2nd ACK messages that the destination host sends are received
Data message ID.
9. method according to claim 8, it is characterised in that methods described also includes：
The intended gateway periodically sends notice message to the source gateway, and the notice message includes that at least one is true
The ID of the data message recognized；
The source gateway removes the corresponding numbers of ID of the data message in the notice message after the notice message is received
According to message.
10. the method according to any one of claim 7 to 9, it is characterised in that described to send with target to the source host
Main frame as source an ACK messages, including：
The source gateway determines the data message destination host to be sent to according to the data message；
The source gateway determines whether the data message is transmitted by satellite link according to the destination host；
When the data message needs to be transmitted by satellite link, the source gateway to the source host is sent with target master
An ACK message of the machine as source.
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