CN113794511A - Gateway supporting interconnection of low-orbit satellite mobile host and land-based internet host - Google Patents
Gateway supporting interconnection of low-orbit satellite mobile host and land-based internet host Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/59—Network arrangements, protocols or services for addressing or naming using proxies for addressing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/03—Protocol definition or specification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/169—Special adaptations of TCP, UDP or IP for interworking of IP based networks with other networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
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Abstract
The mobile host of the low-orbit satellite network is reliably communicated with the internet host, the characteristics of small time delay and flexible movement of the low-orbit satellite network can be combined with the advantage of wide coverage of the internet, and an important technology is provided for the heaven-earth integrated network. The invention provides a gateway supporting effective communication between a mobile host of a low-orbit satellite network domain and a host of a land-based internet domain, and the gateway can be used for solving the problem of bidirectional reliable transmission of files and short messages between the hosts of the two domains. One side of the gateway adopts a capacity interruption network (DTN) architecture, and the other side adopts a TCP/IP architecture; if the host needs to communicate with other hosts across domains, the host needs to communicate with the gateway through a Gateway Transfer Protocol (GTP) first, and then the Proxy of the gateway carries out protocol conversion. The gateway provided by the invention can support the parallel, efficient and bidirectional reliable transmission of files and short messages between the low-orbit satellite domain and the land-based Internet domain host.
Description
Technical Field
The invention belongs to the field of network communication, in particular to a gateway supporting bidirectional communication between a mobile host of a low-orbit satellite network domain and a host of a land-based internet domain, which realizes bidirectional reliable transmission of files and short messages.
Background
With the continuous expansion of the territory of human activities and the continuous enrichment of the types of information services, the demands of various land-based, air-based and sea-based network information services are continuously emerging. The low-orbit satellite runs on a low-earth orbit 120-2000 km away from the ground, has the advantages of low time delay, low loss, strong signals, low cost, rapider system construction and the like, and is a better choice for a plurality of mobile hosts which require small time delay and flexible movement to communicate by using a low-orbit satellite network. Considering that the land-based internet has a wide coverage range, if the problem of reliable communication between a mobile user and an internet user in a low-earth orbit satellite network can be solved, greater communication convenience can be further brought to the mobile user.
The gateway works between the low orbit satellite network and the Internet, one side of the gateway is connected with the Internet, and the other side of the gateway is connected with the low orbit satellite network. The land-based internet employs a conventional TCP/IP architecture. However, due to communication interference, adverse weather effects, or (for cost reduction) a small number of satellites, the low earth orbit satellite network often has problems of frequent link interruption, high communication link error rate, and the like, and if a TCP/IP network architecture is adopted, the communication efficiency is low, and usually, a mobile user in the area needs to adopt an architecture such as a fault tolerant network (DTN). Therefore, the gateway needs to simultaneously handle two different network architectures, namely TCP/IP and DTN, and perform protocol conversion between the two protocol stacks, so as to implement information interconnection and intercommunication between the two communication domains.
The significance and importance of the invention lie in that a gateway supporting effective communication between a mobile host of a low-orbit satellite network domain and a host of a land-based internet domain is provided to solve the problem of bidirectional reliable transmission of files and short messages between the hosts of the two domains.
The information disclosed in this background section is only for enhancement of understanding of the general background of the patent, and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
[ object of the invention ]: the invention provides a gateway supporting interaction between a mobile host of a low-orbit satellite network domain and a host of a land-based internet domain, so as to support the host between the two domains to perform bidirectional reliable transmission of files and short messages.
[ technical solution ]: the technical scheme of the invention is as follows:
1. a gateway for connecting heterogeneous domains, comprising:
(1) the working environment is as shown in fig. 1, one side of the gateway is connected with a low earth orbit satellite network domain, the other side of the gateway is connected with a land-based internet domain, and a low earth orbit satellite network domain mobile host can carry out two-way communication with a land-based internet domain host through the gateway;
(2) and the host between the two domains can be supported to respectively carry out reliable transmission of files and short messages.
2. The gateway of claim 1, having two different protocol stacks as shown in fig. 2:
(1) one side of a low-orbit satellite network domain adopts a DTN protocol architecture, and mobile hosts in the domain communicate with each other according to a DTN architecture;
(2) adopting a traditional TCP/IP protocol architecture at one side of a land-based Internet domain, wherein hosts in the domain communicate with each other according to a TCP/IP architecture;
(3) if the host wants to communicate with other hosts across domains, protocol conversion needs to be carried out through a Proxy of the gateway.
3. Proxy as claimed in claim 2, characterized in that said protocol translation:
(1) the Gateway Transition Protocol (GTP) provides communication specifications between a source host and a gateway in a domain to solve the problem of lack of related information during protocol transition between user cross-domain communication hosts, namely, the source host needs to establish connection with the gateway before crossing the gateway for transmission, and the gateway acquires information of a message header required for establishing TCP or DTN communication so as to be connected with a target host;
(2) FIG. 3 defines the main fields (unit is bit) of GTP message, where Version and Rsv are Version and reserved fields; the Type field is used for storing a unique GTP identification code so as to judge that the protocol is GTP; the Code field and the Type field are matched for defining the protocol attribute; the two fields of Identification and Sequence Number are used for supporting ordered transmission and confirmation between the host and the gateway; placing a destination domain address in an addr field, namely constructing an EID (enhanced identification device) supporting low earth orbit satellite network domain communication to construct a Bundle header, and constructing a port number and an IP (Internet protocol) address supporting Internet domain communication; the file field may be used to store information related to the transmission file, and may also be used to store the message content of the short message. The destination address of the GTP message is the address of the gateway side interface, and the source address is the address of the destination host.
[ advantageous effects ]: the invention has the significance of providing the gateway supporting the communication between the mobile host of the low-orbit satellite network domain and the host of the land-based Internet domain so as to support the host of the two domains to carry out the parallel, efficient and bidirectional reliable transmission of files and short messages.
[ description of drawings ]:
FIG. 1 illustrates an operating environment for interconnecting a low earth orbit satellite network domain with a land-based Internet domain gateway;
FIG. 2 is a protocol stack of a gateway;
FIG. 3 is a gateway translation protocol primary field;
FIG. 4 a gateway trial scenario;
figure 5 GTP generated latency;
figure 6 DTN performance in low earth orbit satellite domain;
figure 7 gateway performance when transferring files of different lengths.
[ embodiment ] A method for producing:
the following detailed description of embodiments of the present invention will be described in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
1. Prototype test environment
In the prototype testing environment shown in fig. 4, network devices such as other gateways, routers, and hosts are real network devices except that the wireless channel between the low-earth orbit satellite and the mobile host is a virtualized link controlled by a virtual network function based on Network Function Virtualization (NFV) technology; the computer for realizing the gateway function is provided with an Intcl Core i7 processor, the main frequency is 3.2GHz, the RAM is 16GB, the operating system version Ubuntu 20.04 and the Linux kernel version 5.4.0-71-genetic.
The method comprises the steps that DTN2 software (version DTN-2.9.0) is installed and configured in a Linux container (LXC) and used for processing the communication process of a low-orbit satellite network domain, a DHCP server and an Open vSwitch are installed and configured, and a self-designed protocol conversion program Proxy is configured, so that a gateway is formed. Setting all link bandwidth of Internet domain to 1000Mbps from end to endThe transmission delay is 90ms, the bandwidth of a low-orbit satellite link in a low-orbit satellite network domain is set to be 100Mbps, the transmission delay is 50ms, and the error rate is set to be 10-6. The communication quality of a low-orbit satellite receiver is influenced by the shielding and environment interference caused by meteorological conditions, buildings, trees and the like in a low-orbit satellite network domain and even the number of available satellites, and a multi-state non-stationary Markov model is adopted to carry out statistical modeling on the interference. The degree of channel communication quality interference in the low earth satellite network domain is modeled by distinguishing between "good" states (i.e., no interference), "moderate" states (i.e., less interference present), and "deep" states (i.e., more interference present).
2. Gateway function testing
The gateway function test is carried out in two cases: one is host initiated communication in the low earth satellite network domain and the other is host initiated communication from the land-based internet domain. The test result shows that fig. 5 shows the GTP generated delay on the premise that the gateway completes the protocol conversion function. It can be seen that in the internet domain, the latency for executing GTP is about 100 ms; in the domain of the low-earth orbit satellite network, the time delay for executing GTP is about 60 ms; and the length of the transmission file does not affect the delay of executing GTP. Furthermore, the delay spread of the two domains is caused by different settings: the end-to-end delay is set to 90ms for the links of the land-based internet domain and 50ms for the links of the low-earth satellite network domain.
In addition, under the condition of moderate interference, 1000 short messages with different sizes are set to perform multiple transmission tests between the host B and the host E in fig. 4 according to different time distribution modes. Test results show that 1000 short messages can be transmitted successfully, the success rate is 100%, most of the short messages are transmitted within 1-2 s, only a small amount of short message transmission delay is found to be large, and analysis shows that the delay is caused by retransmission of the short messages due to link interruption caused by channel interference in a low-orbit satellite domain.
3. Gateway performance testing
According to 3 interference states, the host A and the host E in the figure 4 are respectively set to test the throughput adopting the TCP and DTN protocol architecture under the two conditions that the number of satellites is sufficient and the number of satellites is small. Wherein, when the number of the a satellites is sufficient: if the link is in a good state, the link is not interrupted; in moderate and deep states, link interruption frequencies are set to be 60s and 40s respectively, each interruption time meets normal distribution, and the expected value is 30 s. When the number of b satellites is insufficient: the link interruption frequency needs to be set to 70s, 50s and 30s respectively in normal, low-interference and high-interference states, the interruption time of each time meets the normal distribution, and the expected value is 40 s. Wherein each set of experiments was repeated 10 times and the average was taken as the test result.
Fig. 6 shows throughput test results of the low earth orbit satellite network domain using the TCP protocol and the DTN protocol under two conditions, i.e., a sufficient number of satellites and b small number of satellites. It can be seen that when the link communication state is good, the use of the TCP protocol performs better than the DTN protocol, and the throughput is almost close to the link capacity. However, as the frequency of link outages increases due to increased interference, the DTN protocol exhibits better performance because it essentially has the ability to do nothing more than a large number of data packets before the link outage. In the test, when the channel condition is good, the throughput when the TCP and DTN protocols are adopted is 98.8Mbps and 67.6Mbps respectively; but the throughputs when TCP and DTN protocols are used are 20.3Mbps and 31Mbps, respectively, in deep interference. When the number of satellites is insufficient, the throughput of the TCP protocol and the DTN protocol is changed to 17.7Mbps and 27.7Mbps respectively in deep interference. Obviously, in the low orbit satellite network domain with link interruption, the low orbit satellite communication generally has better performance by adopting a DTN protocol than a TCP protocol, and the network performance shows a more stable state under different interferences.
Fig. 7 shows the experimental results of the transmission of files with different lengths between the host a and the host B in fig. 4 under the condition of moderate interference, and the measurement of the throughput and the time delay when the files are transmitted through the gateway. It can be seen that, 1) the different directions of file transmission have little effect on the transmission delay of the gateway; 2) the throughput is lower when shorter files are transmitted, and the throughput is higher when longer files are transmitted, and the average throughput can reach 36 Mbps.
In summary, the gateway supporting the communication between the mobile host in the low earth orbit satellite network domain and the host in the land-based internet domain provided by the invention has the following beneficial effects: the method can support the host between two different domains to transmit the files and the short messages in parallel, efficiently and reliably.
The foregoing description of specific exemplary embodiments of the present patent is for the purpose of illustration and example. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the present patent disclosure and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the present patent disclosure as well as various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the patent be defined by the claims and their equivalents.
Claims (3)
1. A gateway for connecting heterogeneous domains, comprising:
(1) one side of the gateway is connected with a low-orbit satellite network domain, the other side of the gateway is connected with a land-based internet domain, and the low-orbit satellite network domain mobile host can perform two-way communication with a land-based internet domain host through the gateway;
(2) and the host between the two domains can be supported to respectively carry out reliable transmission of files and short messages.
2. The gateway of claim 1, having two different protocol stacks:
(1) one side of a low-orbit satellite network domain adopts a DTN protocol architecture, and mobile hosts in the domain communicate with each other according to a DTN architecture;
(2) adopting a traditional TCP/IP protocol architecture at one side of a land-based Internet domain, wherein hosts in the domain communicate with each other according to a TCP/IP architecture;
(3) if the host wants to communicate with other hosts across domains, protocol conversion needs to be carried out through a Proxy of the gateway.
3. Proxy as claimed in claim 2, characterized in that said protocol translation:
(1) the Gateway Transition Protocol (GTP) provides communication specifications between a source host and a gateway in a domain to solve the problem of lack of related information during protocol transition between user cross-domain communication hosts, namely, the source host needs to establish connection with the gateway before crossing the gateway for transmission, and the gateway acquires information of a message header required for establishing TCP or DTN communication so as to be connected with a target host;
(2) the GTP message mainly comprises 8 fields (the unit is a bit), wherein Version and Rsv are Version and reserved fields; the Type field is used for storing a unique GTP identification code so as to judge that the protocol is GTP; the Code field and the Type field are matched for defining the protocol attribute; the two fields of Identification and Sequence Number are used for supporting ordered transmission and confirmation between the host and the gateway; placing a destination domain address in an addr field, namely constructing an EID (enhanced identification device) supporting low earth orbit satellite network domain communication to construct a Bundle header, and constructing a port number and an IP (Internet protocol) address supporting Internet domain communication; the file field may be used to store information related to the transmission file, and may also be used to store the message content of the short message. The destination address of the GTP message is the address of the gateway side interface, and the source address is the address of the destination host.
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| CN202111117842.1A CN113794511A (en) | 2021-09-23 | 2021-09-23 | Gateway supporting interconnection of low-orbit satellite mobile host and land-based internet host |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510840A (en) * | 1999-07-09 | 2009-08-19 | 马利布网络有限公司 | TCP/IP packet-centric wireless transmission system architecture |
| US20160308818A1 (en) * | 2015-04-15 | 2016-10-20 | Hughes Network Systems, Llc | Preferential selection of ip protocol version with domain name matching on proxy servers |
| CN113015113A (en) * | 2021-04-19 | 2021-06-22 | 广东海洋大学 | Ocean Internet of things general gateway data forwarding method based on Beidou satellite |
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- 2021-09-23 CN CN202111117842.1A patent/CN113794511A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510840A (en) * | 1999-07-09 | 2009-08-19 | 马利布网络有限公司 | TCP/IP packet-centric wireless transmission system architecture |
| US20160308818A1 (en) * | 2015-04-15 | 2016-10-20 | Hughes Network Systems, Llc | Preferential selection of ip protocol version with domain name matching on proxy servers |
| CN113015113A (en) * | 2021-04-19 | 2021-06-22 | 广东海洋大学 | Ocean Internet of things general gateway data forwarding method based on Beidou satellite |
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