CN112803982A - Satellite multicast distribution system based on CDN cache technology and working method thereof - Google Patents
Satellite multicast distribution system based on CDN cache technology and working method thereof 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
- H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
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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
- H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
- H04B7/18526—Arrangements for data linking, networking or transporting, or for controlling an end to end session
Abstract
The invention discloses a CDN cache technology-based satellite multicast distribution system and a working method thereof, which comprises the following specific steps: the ground central station distribution service and the remote station receiving service are added into a satellite multicast group; a ground central station sending end acquires local CDN cache data, codes the data by using a RaptorQ coding mode, and distributes the coded data to all remote receiving ends in a multicast group through a satellite link; the remote receiving end receives the multicast data transmitted by the ground central station through the satellite link, decodes the received data by using a RaptorQ decoding mode and stores the decoded data in a local resource server; and the remote user acquires resources from the local resource server by using a CDN redirection technology. According to the invention, the hot resource data cached on the ground central station is multicast and distributed to the remote station in advance, so that the remote user can acquire resources from the local resource server through the intranet, and the purposes of accelerating the internet surfing experience of the remote user and saving the satellite link bandwidth resources are achieved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a satellite multicast distribution system based on a CDN cache technology and a working method thereof.
Background
With the development of information technology, the internet is increasingly integrated into life and study, and is being used as a brand-new information flow bearing platform to deeply change the life and communication modes of people. The internet service is applied to live video, network advertisement, multimedia news distribution, electronic commerce, video on demand, remote education, remote medical treatment, internet radio stations and the like, the rich content expression forms of the internet service endow bandwidth application with more entertainment and interactivity, and users have enough bandwidth resources in order to reduce time delay and ensure watching quality.
Users in mountainous areas or in middle and far seas normally cannot receive base station signals, and can only realize interconnection and intercommunication with the outside in a satellite communication mode. As an important result of modern communication technology, a satellite communication system has the advantages of large communication coverage area, long communication distance, wide communication frequency band and the like, and is well suitable for remote mountainous areas and middle and far sea areas. However, satellite communication also has the disadvantages of prolonged transmission time, easy signal attenuation, large error rate, and short bandwidth resource, and if a user needs to download a large-flow file or experience streaming media service, the problems of slow loading, reduced access speed, easy error, and the like occur, resulting in reduced user experience. Therefore, internet content acceleration service can be introduced into a satellite communication system, an intelligent virtual network is constructed on the basis of the existing satellite network, and a user can obtain required content nearby by means of the remote resource server and the functional modules of the central platform, such as load balancing, content distribution, scheduling and the like, so that network congestion is reduced, the corresponding access speed of the user is increased, and the user experience degree is improved
However, when a remote user requests a resource, the CDN service only caches resource data on the ground center station resource server and the corresponding remote resource server, and if other remote users request the same resource, the CDN service still needs to acquire the resource from the ground center station or the source station through the satellite link, and cannot experience an acceleration effect of caching for multiple times.
Disclosure of Invention
The invention aims to provide a satellite multicast distribution system based on a CDN cache technology and a working method thereof, and particularly, the CDN service is introduced into a satellite communication system, so that a remote user can experience the internet acceleration effect, and the satellite multicast distribution technology is also utilized to compress and encode cache data generated by the CDN service in a ground central station, and then the cache data is distributed to all the remote ends in a satellite multicast group in a link idle period, so that the hot resources are pre-cached by all the remote ends in the system, when any remote end in the system requests cached resources, the cache data can be directly obtained from a local resource server, and the cache data does not need to be obtained from a source station or the ground central station through a satellite link, so that the acceleration effect of one-time cache and multiple-time utilization is realized.
In order to achieve the purpose, the invention adopts the technical scheme that: a satellite multicast distribution system based on CDN cache technology has the innovation points that: the system mainly comprises a ground central station of a ground section, a satellite communication station of a space section and a remote station of a shipborne section; the ground central station mainly comprises a ground satellite antenna, a satellite gateway and a ground data center, is mainly responsible for receiving request information of a remote user, generates cache data by CDN service and then distributes the data by multicast distribution technology; the satellite link mainly comprises a satellite link and a communication satellite and provides a data transmission link for the operation of the whole system; the remote station mainly comprises a shipborne satellite antenna, a satellite gateway and a remote resource server, and is mainly responsible for forwarding request information of users, receiving and storing multicast data and providing secondary acceleration service.
Furthermore, the satellite link is a transmission link mainly composed of a remote transceiver station, an uplink, a satellite transponder, a downlink and a ground transceiver station.
A working method of a satellite multicast distribution system based on a CDN cache technology is characterized by comprising the following specific steps:
s1, adding the ground central station distribution service and the remote station receiving service into a satellite multicast group;
s2, the ground central station sending end obtains local CDN cache data, codes the data by using a RaptorQ coding mode, and distributes the coded data to all remote receiving ends in the multicast group through a satellite link;
s3, the remote receiving end receives the multicast data transmitted by the ground central station through the satellite link, decodes the received data by RaptorQ decoding mode and stores the decoded data in the local resource server;
and S4, the remote user directly obtains the resources from the local resource server by using CDN redirection technology.
Furthermore, the communication mode of the satellite link adopts a UDP multicast protocol to carry out data communication, the ground central station distributes service and remote receiving service, and the service is added into a satellite multicast group according to multicast information in the configuration file.
Further, when a user at a remote station requests a resource, the CDN service generates a content cache on the ground hub resource server and the corresponding remote resource server, and when a user at the same remote station requests the same resource again, the request is redirected to the local cache server.
Furthermore, the content cache performs cache backup on resources requested by a remote user at a ground station server by using a CDN service, and stores cache information in a specified database, wherein the cache information comprises fields of "cachefile", "addtime" and "done"; the cache file is used for storing a storage path of cache data; "addtime" for storing the time of data generation; and the done is used for storing the data state, if the done is 0, the data is not distributed, if the done is 1, the data is successfully distributed, and in the working period, the multicast distribution service can automatically retrieve the record of which the done is 0 in the database, acquire the storage position of the cache data, read the cache data and start the multicast distribution process.
Further, the multicast sub-service selects a time period with lower internet access demand of the user to form peak-off work.
Furthermore, after the ground central station distribution service acquires the data to be distributed, the data is compressed first to reduce the data capacity, and then the compressed data is encoded.
Further, the encoding processing is combined with the data distribution requirement, and a fountain code RaptorQ encoding mechanism is selected to encode the data; fountain codes include LT codes, Raptor codes, and RaptorQ codes.
Further, after receiving the multicast data, the remote station receiving service decodes the received data according to the coding information in the data packet to recover the original data; the remote station stores the received resource data locally, and when the remote user requests the resource, the redirection technology in the CDN service redirects the request to the local resource server.
The invention has the beneficial effects that:
compared with the existing satellite communication system, particularly the satellite communication system which also introduces the CDN service, the invention creatively combines the CDN cache technology and the satellite multicast distribution technology on the premise of ensuring that a remote user can be interconnected and communicated with the outside through the satellite communication system and realizing the remote internet content acceleration by utilizing the CDN service, and constructs a set of internet content acceleration system suitable for all users in the satellite communication system, so that the resources requested by the remote user for the first time can be distributed to all terminals in the system through the satellite multicast distribution technology after being cached at a local station and a central station, and the hot resource all-terminal pre-caching is realized, thereby realizing the purposes of realizing the repeated utilization of one-time caching, reducing the access delay and improving the user experience.
Drawings
FIG. 1 is a system architecture diagram of the present invention;
FIG. 2 is a general flow chart of the present invention;
fig. 3 is a flowchart of the multicast data distribution at the ground end according to the present invention;
fig. 4 is a flow chart of remote station multicast data reception according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1-2, the satellite multicast distribution system based on the CDN caching technology provided by the present invention mainly includes a ground central station in a ground segment, a satellite communication station in a space segment, and a remote station in a shipborne segment:
the ground central station (ground segment) mainly comprises a ground satellite antenna, a satellite gateway and a ground data center, is mainly responsible for receiving request information of a remote user, generates cache data by CDN service, and then distributes the data by multicast distribution technology.
The satellite communication station (space section) mainly comprises an uplink link, a downlink link and a communication satellite, and provides a data transmission link for the operation of the whole system.
The remote station (shipborne section) mainly comprises a shipborne satellite antenna, a satellite gateway and a remote resource server, and is mainly responsible for forwarding request information of users, receiving and storing multicast data and providing secondary acceleration service.
In this embodiment, the satellite link is a transmission link mainly composed of a remote transceiver station, an uplink, a satellite transponder, a downlink, and a ground transceiver station, and is mainly used for establishing contact between users in the middle and far seas and remote areas and the outside world, so as to achieve interconnection. The multicast distribution service and the CDN central station service are deployed on a ground receiving and transmitting station server, the multicast receiving service and the CDN remote service are deployed on a remote receiving and transmitting station server, the functions of data distribution and remote content acceleration are realized through a constructed satellite link, and the functions of CDN cache multicast data distribution and remote content acceleration are realized through an uplink link, a downlink link and a satellite link constructed by a satellite transponder.
A working method of a satellite multicast distribution system based on a CDN cache technology comprises the following specific steps:
s1, adding the ground central station distribution service and the remote station receiving service into a satellite multicast group;
s2, the ground central station sending end obtains local CDN cache data, codes the data by using a RaptorQ coding mode, and distributes the coded data to all remote receiving ends in the multicast group through a satellite link;
s3, the remote receiving end receives the multicast data transmitted by the ground central station through the satellite link, decodes the received data by RaptorQ decoding mode and stores the decoded data in the local resource server;
and S4, the remote user directly obtains the resources from the local resource server by using CDN redirection technology.
In this embodiment, the communication mode of the satellite link uses UDP multicast protocol for data communication, and the ground central station distributes service and remote receiving service, and adds the multicast information in the configuration file to the satellite multicast group.
In this embodiment, when a user at a certain remote station requests a resource, the CDN service generates content cache on the ground central station resource server and the corresponding remote resource server, and when the user at the same remote station requests the same resource again, the request is redirected to the local cache server, thereby accelerating the internet surfing experience of the intranet user and saving the satellite bandwidth.
In this embodiment, the content cache performs cache backup on resources requested by a remote user at a ground station server by using a CDN service, and stores cache information in a designated database, where the cache information includes "cachefile", "addtime", and "done" fields; the cache file is used for storing a storage path of cache data; "addtime" for storing the time of data generation; and the done is used for storing the data state, if the done is 0, the data is not distributed, if the done is 1, the data is successfully distributed, and in the working period, the multicast distribution service can automatically retrieve the record of which the done is 0 in the database, acquire the storage position of the cache data, read the cache data and start the multicast distribution process.
In the embodiment, considering that the satellite link bandwidth is narrow and the link resources are in shortage, the satellite multicast service generally selects a time period with lower internet access demand of the user to form off-peak work, so that the bandwidth resources of the user are prevented from being seized, and the internet access experience of the user is prevented from being influenced.
In this embodiment, in order to save the satellite bandwidth, after the multicast distribution service of the ground station acquires the data to be distributed, the data is compressed first, so as to reduce the data capacity. In addition, in consideration of the characteristics of long delay and high error rate of a satellite link, the multicast distribution service can also perform coding processing on compressed data, so that the robustness and confidentiality of the data are improved.
In this embodiment, a fountain code RaptorQ coding mechanism is selected in combination with a data distribution requirement to perform coding processing on data. Fountain codes are a forward error correction coding technology, have linear coding and decoding complexity and are not limited in code rate, namely a sending end can generate any number of coding packets, and a receiving end can correctly decode only by accurately receiving a certain number of packets. Fountain codes include LT codes, Raptor codes, and Raptor q codes, where a Raptor q code is a Raptor code defined over a galois field GF (256) that requires less overhead and supports the encoded transmission of more packets of information than other fountain codes when successfully decoded.
In this embodiment, after receiving multicast data, the remote station performs decoding on the received data according to the coding information in the data packet to recover the original data; the remote station locally stores the received resource data, and when a remote user requests the resource, a redirection technology in the CDN service redirects the request to a local resource server, so that the satellite link resource is not occupied again, the purposes of once caching and multiple utilization are achieved, and the satellite bandwidth is saved.
Example 2
Referring to fig. 3, in the satellite multicast distribution system based on the CDN caching technology provided in the present invention, the ground multicast data distribution process is as follows:
and after the system service is started, the background is kept running, whether the system service is in the service time interval or not is detected according to the configuration requirement, if the system service is not in the service time interval, the system service continues waiting, and if the system service is in the service time interval, the system service starts to work.
In the service working time period, the system service sets a timer, periodically and actively queries the cache resource database "sync _ task", detects whether a record with a field "done" value of "0" exists, and acquires the field "cachefile" value in the corresponding record if the record exists, namely acquires the storage location of the piece of CDN cache data.
In order to save satellite bandwidth, after the CDN cache data is read, the CDN cache data is compressed, and the capacity of the data to be sent is reduced. And then, according to the information of fountain code length, packet length, redundancy and the like in the configuration file, encoding the compressed data according to a fountain code RaptorQ encoding mode to form an encoding packet.
Finally, the encoded packets are multicast distributed to all remote stations over a satellite link using UDP multicast technology.
Example 3
Referring to fig. 4, in the satellite multicast distribution system based on the CDN caching technology provided in the present invention, the remote station multicast data reception process is as follows:
after the system service is started, the background operation is kept, a timer is set to periodically detect whether a multicast is sent, if not, the system service continues to wait, and if so, the system service starts to work.
After receiving the multicast data, the system service acquires packet information in the data packet according to a multicast distribution protocol, wherein the packet information comprises file size, file name, code length, packet length and the like.
And the system service decodes the received multicast data according to the fountain code RaptorQ decoding mode after acquiring the file information and the coding information, recovers the original data and stores the data according to the specified format.
After the multicast distribution of the CDN cache data is completed according to the steps, all the remote stations can realize the pre-downloading of the hot resources. When any remote user requests certain locally cached data, the data are not required to be acquired from a ground central station or a source station through a satellite link, but can be directly acquired from a local resource server through a CDN redirection technology, so that the purposes of once caching and multiple utilization, satellite bandwidth resource saving, operation cost reduction and the like are achieved.
Example 4
When a remote user requests a hot resource for the first time, the CDN service obtains the resource from the source station and stores the cache file on the ground center station and the remote station resource server. When the ground central station multicast distribution service detects that a CDN cache file is generated, the storage position of the cache file is obtained from a database 'sync _ task', then the cache file is subjected to data compression and is encoded by using a RaptorQ encoding mode to form an encoded group, multicast distribution is performed through a satellite link, and after multicast data are received by the remote station multicast receiving service, the data are decoded and stored, so that the pre-downloading and pre-caching of hot resources by all remote ends in the system are realized, and the access time of remote users to the hot resources is shortened.
Example 5
When the resource requested by any remote user in the satellite multicast group is cached locally, the CDN redirection service can point the user request to the local resource cache server, so that the user can directly obtain the resource from the local without obtaining the resource from a source station or a ground central station through a satellite link, the user access time is greatly shortened, the content acceleration effect is realized, and the user experience is improved.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A satellite multicast distribution system based on CDN cache technology is characterized in that: the system mainly comprises a ground central station of a ground section, a satellite communication station of a space section and a remote station of a shipborne section; the ground central station mainly comprises a ground satellite antenna, a satellite gateway and a ground data center, is mainly responsible for receiving request information of a remote user, generates cache data by CDN service and then distributes the data by multicast distribution technology; the satellite link mainly comprises a satellite link and a communication satellite and provides a data transmission link for the operation of the whole system; the remote station mainly comprises a shipborne satellite antenna, a satellite gateway and a remote resource server, and is mainly responsible for forwarding request information of users, receiving and storing multicast data and providing secondary acceleration service.
2. The satellite multicast distribution system based on the CDN caching technology as recited in claim 1, wherein: the satellite link is a transmission link mainly composed of a remote transceiver station, an uplink, a satellite transponder, a downlink and a ground transceiver station.
3. A working method of the satellite multicast distribution system based on the CDN caching technology according to any one of claims 1 to 2, characterized by comprising the following specific steps:
s1, adding the ground central station distribution service and the remote station receiving service into a satellite multicast group;
s2, the ground central station sending end obtains local CDN cache data, codes the data by using a RaptorQ coding mode, and distributes the coded data to all remote receiving ends in the multicast group through a satellite link;
s3, the remote receiving end receives the multicast data transmitted by the ground central station through the satellite link, decodes the received data by RaptorQ decoding mode and stores the decoded data in the local resource server;
and S4, the remote user directly obtains the resources from the local resource server by using CDN redirection technology.
4. The working method of the satellite multicast distribution system based on the CDN caching technology as recited in claim 3, wherein: the communication mode of the satellite link adopts a UDP multicast protocol to carry out data communication, the ground central station distributes service and remote receiving service, and the satellite multicast group is added according to the multicast information in the configuration file.
5. The working method of the satellite multicast distribution system based on the CDN caching technology as recited in claim 3, wherein: when a user at a remote station requests resources, the CDN service generates content caches on the ground hub resource server and the corresponding remote resource server, and when a user at the same remote station requests the same resources again, the request is redirected to a local cache server.
6. The working method of the satellite multicast distribution system based on the CDN caching technology as recited in claim 5, wherein: the content cache is used for carrying out cache backup on resources requested by a remote user in a ground station server by CDN service, and storing cache information in a specified database, wherein the cache information comprises fields of "cachefile", "addtime" and "done"; the cache file is used for storing a storage path of cache data; "addtime" for storing the time of data generation; and the done is used for storing the data state, if the done is 0, the data is not distributed, if the done is 1, the data is successfully distributed, and in the working period, the multicast distribution service can automatically retrieve the record of which the done is 0 in the database, acquire the storage position of the cache data, read the cache data and start the multicast distribution process.
7. The working method of the satellite multicast distribution system based on the CDN caching technology as recited in claim 6, wherein: the multicast sub-service selects a time period with lower internet access demand of the user to form off-peak work.
8. The working method of the satellite multicast distribution system based on the CDN caching technology as recited in claim 3, wherein: after the ground central station distribution service acquires the data to be distributed, the data is compressed to reduce the data capacity, and then the compressed data is encoded.
9. The working method of the satellite multicast distribution system based on the CDN caching technology as recited in claim 8, wherein: the coding processing is combined with the data distribution requirement, and a fountain code RaptorQ coding mechanism is selected to code the data; fountain codes include LT codes, Raptor codes, and RaptorQ codes.
10. The working method of the satellite multicast distribution system based on the CDN caching technology as recited in claim 3, wherein: after receiving the multicast data, the remote station receiving service decodes the received data according to the coding information in the data packet and recovers the original data; the remote station stores the received resource data locally, and when the remote user requests the resource, the redirection technology in the CDN service redirects the request to the local resource server.
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| CN202011392452.0A CN112803982A (en) | 2021-02-03 | 2021-02-03 | Satellite multicast distribution system based on CDN cache technology and working method thereof |
| CN202111465602.0A CN114157342A (en) | 2020-12-03 | 2021-12-03 | Satellite multicast distribution system based on CDN cache technology and working method thereof |
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| CN114499642A (en) * | 2022-01-25 | 2022-05-13 | 微感科技(南通)有限公司 | Code equal division caching method for satellite-ground communication transmission |
| CN114554432A (en) * | 2022-02-23 | 2022-05-27 | 深圳市天海世界卫星通信科技有限公司 | Satellite internet system based on local server |
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| CN114499642A (en) * | 2022-01-25 | 2022-05-13 | 微感科技(南通)有限公司 | Code equal division caching method for satellite-ground communication transmission |
| CN114554432A (en) * | 2022-02-23 | 2022-05-27 | 深圳市天海世界卫星通信科技有限公司 | Satellite internet system based on local server |
| CN114944861A (en) * | 2022-04-08 | 2022-08-26 | 亚太卫星宽带通信（深圳）有限公司 | Multicast baseband configuration system and method |
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