CN111526433A - Satellite communication end station roll call method - Google Patents
Satellite communication end station roll call method Download PDFInfo
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- CN111526433A CN111526433A CN202010624554.4A CN202010624554A CN111526433A CN 111526433 A CN111526433 A CN 111526433A CN 202010624554 A CN202010624554 A CN 202010624554A CN 111526433 A CN111526433 A CN 111526433A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/64—Addressing
- H04N21/6405—Multicasting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/478—Supplemental services, e.g. displaying phone caller identification, shopping application
- H04N21/4788—Supplemental services, e.g. displaying phone caller identification, shopping application communicating with other users, e.g. chatting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
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- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Radio Relay Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention relates to the technical field of satellite communication, and discloses a roll call method for a satellite communication end station, which has the technical scheme that a network management system is used for creating a list of end stations to be roll called, distributing satellite frequency point resources, issuing a multicast communication IP address to a master station video matrix and commanding to prepare a video session; the network management system establishes a forward link with an end station in an end station list to be roll-called; after the forward video communication from the master station to the end station is realized, the network management system selects the nth end station and the (n + 1) th end station to establish a return link, carries out roll calling and recording on the nth end station, and enables the (n + 1) th end station to enter a state of waiting for roll calling; after all end stations finish roll calling, satellite frequency point resources are recovered, a video matrix is closed, and a roll calling condition report is generated, so that the switching link establishment efficiency in the video roll calling process of the end stations of the satellite communication channel can be improved, the station switching time of the video roll calling under the condition of the end stations is shortened, the satellite bandwidth resource requirement is saved, and the operation complexity of service roll calling is reduced.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a satellite communication end station roll calling method.
Background
The satellite communication has the characteristics of long transmission distance, no region limitation, no need of ground fixed infrastructure and the like, and is widely applied to special tasks such as military operation, public security outburst, emergency rescue, fire rescue and the like, and application scenes such as ocean voyage, outdoor operation and the like. The star network is a networking method used most in satellite communication.
The video roll call is a conventional service in a satellite communication network, and mainly aims to check a large number of end stations, determine whether equipment is intact and determine whether an on-duty person is on the spot. The roll call mode adopted by video roll call is as follows: the satellite forward and return links are manually established by the master station operator with the end stations to be called one by one, or a calling link and a waiting link are simultaneously established.
The main station operator establishes the mode of the front and back links of the satellite with the roll-call end station one by one in a manual mode, and the mode specifically embodies that the link establishment time and the video connection time of the satellite are long each time: the time delay of network management issuing parameters is about 300ms, the time delay of satellite link synchronization is about 400ms, the time delay of video connection is about 30s, the total time delay is close to 31s, and the intermediate switching waiting time is about 52 minutes if 100 end stations exist, so that the whole roll call process is very long and the operation efficiency is low. By adopting a mode of simultaneously establishing a roll call link and a waiting link, although the switching waiting time delay can be greatly reduced, 2 paths of forward links and 2 paths of return satellite links are respectively established, a network management system needs to allocate 2 forward link bandwidth resources and 2 return link bandwidth resources, the broadcasting characteristics of a satellite communication wireless channel are not fully utilized, and the use of the bandwidth resources is not economical enough. In addition, the satellite link establishment and video switching operation is manually carried out, the process is complicated, the requirement on operators is high, and the actual using effect is poor.
Disclosure of Invention
The invention aims to provide a satellite communication end station roll call method, which can improve the switching link establishment efficiency in the video roll call process of a satellite communication channel end station, obviously shorten the station switching time of video roll call under the condition of multiple remote end stations, save the satellite bandwidth resource requirement and reduce the operation complexity of service roll call.
The technical purpose of the invention is realized by the following technical scheme: a satellite communication end station roll calling method comprises the following steps:
creating a list of end stations to be called through a network management system, allocating satellite frequency point resources, issuing multicast communication IP addresses to a master station video matrix and commanding to prepare video sessions;
the network management system establishes a forward link with an end station in an end station list to be roll-called;
after the forward video communication from the master station to the end station is realized, the network management system selects the nth end station and the (n + 1) th end station to establish a return link, carries out roll calling and recording on the nth end station, and enables the (n + 1) th end station to enter a state of waiting for roll calling; after the nth end name is finished, roll calling the (n + 1) th end station, and selecting the (n + 1) th end station to establish a return link to enter a waiting state;
and after all the end stations finish roll calling, recovering the satellite frequency point resources, closing the video matrix and generating a roll calling condition report.
As a preferred technical solution of the present invention, the list of end stations to be called includes an end station name and an end station ID.
As a preferred technical scheme of the invention, the satellite frequency point resources comprise 1 forward TDM broadcast channel frequency spectrum resource and 2 backward FDMA service channel frequency spectrum resources.
As a preferred technical solution of the present invention, the process of establishing a forward link between a network management system and an end station is as follows: the network management system selects two main station services Modem 1 and M2 and issues channel link establishing parameters, and issues forward receiving channel parameters to all end stations to be called through the network management channel, so that a forward TDM broadcast link is established, and forward video multicast communication from the main station to the end stations is realized.
As a preferred technical solution of the present invention, the issuing, by the network management system, channel link establishment parameters to the master station services modems M1 and M2 includes: issuing a forward TDM broadcast parameter FP and a return receiving parameter BP1a to M1, issuing a return receiving parameter BP2a to M2, commanding M1 to open a transmitting channel switch and a receiving channel switch, and commanding M2 to open a receiving channel switch; when the network management system sends the receiving channel parameters FP' to all the end stations to be called through the network management channel, the end station Modem opens the receiving switch to establish a forward communication link.
As a preferred technical solution of the present invention, the establishment process of the return video communication from the end station to the master station is as follows: the network management system selects two end stations Tn and Tn +1 from the list of the end stations to be called, and respectively sends back channel building parameters BP1b and BP2b to Tn and Tn +1 through a network management channel, and the Tn and Tn +1 configure a local service Modem according to the received building parameters and open a back service channel transmitting switch; after receiving the receiving state synchronization notification reported by the master station modems M1 and M2, the network management system issues multicast communication IP addresses to the video codecs of the end stations Tn and Tn +1 through a network management channel, and orders the video codecs to establish video connection with the master station video matrix, so that the return video communication from the end stations to the master station is realized.
As a preferred technical scheme of the invention, the roll call operation comprises the following specific processes: selecting an nth end station Tn to be called through a network management system calling interface, automatically informing a main station video matrix to switch to an image of the end station Tn by a network management system background, entering a calling state, and recording the calling result information on the network management system calling interface; after the Tn roll calling is completed, selecting the next end station Tn +1, informing the video matrix to switch the image to the Tn +1 end station by the network management system background, and starting the roll calling operation on the Tn +1 end station; meanwhile, the background of the network management system informs the end station Tn to close the video coder-decoder and the Modem transceiver switch through a network management channel, and removes the end station Tn from the list of the end stations to be called; the network management system selects the next end station Tn +2 in sequence from the list of end stations to be called, sends a return link parameter BP1 and a multicast communication IP address of a video codec to the next end station, commands a Modem of the Tn +2 to open a return channel transmitting switch, commands the Tn +2 video codec and a main station video matrix to establish video connection, and enters a waiting state; and the subsequent end stations sequentially perform roll calling operation by adopting the same method until all the end stations in the list complete roll calling.
As a preferred technical scheme of the invention, in the process of roll calling all end stations, if a satellite link of a certain end station fails to be established, the network management system puts the end station at the end of a list of end stations to be roll called, and roll calling operation is carried out again after roll calling of other end stations is finished; if the roll call is still unsuccessful for the second time, the network management system will end the roll call operation and record the roll call failure condition.
In conclusion, the invention has the following beneficial effects: the switching and link establishing efficiency in the video roll call process of the satellite communication channel end station can be improved, the station switching time of the video roll call under the condition of multiple remote end stations is obviously shortened, the requirement of satellite bandwidth resources is saved, and the operation complexity of service roll call is reduced.
Drawings
Fig. 1 is a flow chart of video roll calling at a satellite communication end station according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a satellite communication end station roll calling method, as shown in figure 1, comprising the following stages and steps:
roll call initialization stage: an operator creates a list of end stations to be called through a network management system of a satellite, allocates satellite frequency point resources, namely a central frequency point and bandwidth, issues a multicast communication IP address to a master station video matrix and orders the master station video matrix to enter a video session mode;
a forward link building stage: the network management system establishes a forward TDM broadcast channel and establishes forward links with all end stations needing roll calling, so as to realize forward video multicast communication from a main station to the end stations;
video roll call stage: after the forward video communication from the master station to the end station is realized, the network management system selects the nth end station and the (n + 1) th end station to establish a return link, carries out roll calling and recording on the nth end station, and enables the (n + 1) th end station to enter a state of waiting for roll calling; after the nth end station finishes, roll calling the (n + 1) th end station, and select the (n + 1) th end station to establish a return link to enter a waiting state until all end stations in the list of the end stations to be roll called finish the roll calling operation;
and (3) roll calling ending stage: and after all the end stations finish roll calling, the network management system recovers the satellite frequency point resources, closes the video matrix and generates a roll calling condition report.
Specifically, the list of end stations to be called includes the names of the end stations and the IDs of the end stations.
Specifically, the satellite frequency point resources include 1 forward TDM broadcast channel spectrum resource and 2 backward FDMA service channel spectrum resources.
Specifically, the process of establishing the forward link between the network management system and the end station is as follows: the network management system selects two main station services Modem 1 and M2 and issues channel link establishing parameters, and issues forward receiving channel parameters to all end stations to be called through the network management channel, so that a forward TDM broadcast link is established, and forward video multicast communication from the main station to the end stations is realized; the network management system issues channel link establishment parameters to the master station service modems M1 and M2, and the parameters comprise: issuing a forward TDM broadcast parameter FP and a return receiving parameter BP1a to M1, issuing a return receiving parameter BP2a to M2, commanding M1 to open a transmitting channel switch and a receiving channel switch, and commanding M2 to open a receiving channel switch; when the network management system issues receiving channel parameters FP' to all end stations to be called through a network management channel, the center frequency point of FP = center frequency point of FP + system frequency offset, the bandwidths of the center frequency point of FP and the system frequency offset are the same, and the end stations Modem open a receiving switch to establish a forward communication link.
Specifically, the establishment process of the return video communication from the end station to the master station is as follows: the network management system selects two end stations Tn and Tn +1 from the list of end stations to be called, return channel link establishment parameters BP1b and BP2b are respectively issued to Tn and Tn +1 through a network management channel, the BP1b center frequency point = BP1 center frequency point + system frequency offset, the BP2b center frequency point = BP2 center frequency point + system frequency offset, and Tn +1 configure a local service Modem according to the received link establishment parameters and open a return service channel transmitting switch; after receiving the receiving state synchronization notification reported by the master station Modem M1 and M2, the network management system issues multicast communication IP addresses to the video codecs of the end stations Tn and Tn +1 through a network management channel and orders the video codecs of the end stations Tn and Tn +1 to establish video connection with the master station video matrix, so that backward video communication from the end stations to the master station is realized;
specifically, the roll call operation comprises the following specific processes: selecting an nth end station Tn to be called through a network management system calling interface, automatically informing a main station video matrix to switch to an image of the end station Tn by a network management system background, entering a calling state, and recording the calling result information on the network management system calling interface; after the Tn roll calling is completed, selecting the next end station Tn +1, informing the video matrix to switch the image to the Tn +1 end station by the network management system background, and starting the roll calling operation on the Tn +1 end station; meanwhile, the background of the network management system informs the end station Tn to close the video coder-decoder and the Modem transceiver switch through a network management channel, and removes the end station Tn from the list of the end stations to be called; the network management system selects the next end station Tn +2 in sequence from the list of end stations to be called, sends a return link parameter BP1 and a multicast communication IP address of a video codec to the next end station, commands a Modem of the Tn +2 to open a return channel transmitting switch, commands the Tn +2 video codec and a main station video matrix to establish video connection, and enters a waiting state; and the subsequent end stations sequentially perform roll calling operation by adopting the same method until all the end stations in the list complete roll calling.
Specifically, in the process of roll calling all end stations, if a satellite link of a certain end station fails to be established, the network management system puts the end station at the end of a list of end stations to be roll called, and roll calling operation is performed again after roll calling of other end stations is completed; if the roll call is still unsuccessful for the second time, the network management system will end the roll call operation and record the roll call failure condition.
In conclusion, the video roll call method for the satellite communication end station can improve the switching link establishment efficiency in the video roll call process of the satellite communication channel end station, obviously shorten the station switching time of the video roll call under the condition of multiple remote end stations, save the satellite bandwidth resource requirement and reduce the operation complexity of service roll call.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A satellite communication end station roll call method is characterized in that: the method comprises the following steps:
creating a list of end stations to be called through a network management system, allocating satellite frequency point resources, issuing multicast communication IP addresses to a master station video matrix and commanding to prepare video sessions;
the network management system establishes a forward link with an end station in an end station list to be roll-called;
after the forward video communication from the master station to the end station is realized, the network management system selects the nth end station and the (n + 1) th end station to establish a return link, carries out roll calling and recording on the nth end station, and enables the (n + 1) th end station to enter a state of waiting for roll calling; after the nth end name is finished, roll calling the (n + 1) th end station, and selecting the (n + 1) th end station to establish a return link to enter a waiting state;
and after all the end stations finish roll calling, recovering the satellite frequency point resources, closing the video matrix and generating a roll calling condition report.
2. The satellite communication end station roll call method according to claim 1, characterized in that: the list of the end stations to be roll-called comprises end station names and end station IDs.
3. The satellite communication end station roll call method according to claim 1, characterized in that: the satellite frequency point resources comprise 1 forward TDM broadcast channel frequency spectrum resource and 2 backward FDMA service channel frequency spectrum resources.
4. The satellite communication end station roll call method according to claim 3, characterized in that: the process of establishing the forward link between the network management system and the end station is as follows: the network management system selects two main station services Modem 1 and M2 and issues channel link establishing parameters, and issues forward receiving channel parameters to all end stations to be called through the network management channel, so that a forward TDM broadcast link is established, and forward video multicast communication from the main station to the end stations is realized.
5. The method for roll calling a satellite communication terminal station as claimed in claim 4, wherein: the network management system issues channel link establishment parameters to the master station service modems M1 and M2, and the parameters comprise: issuing a forward TDM broadcast parameter FP and a return receiving parameter BP1a to M1, issuing a return receiving parameter BP2a to M2, commanding M1 to open a transmitting channel switch and a receiving channel switch, and commanding M2 to open a receiving channel switch; when the network management system sends the receiving channel parameters FP' to all the end stations to be called through the network management channel, the end station Modem opens the receiving switch to establish a forward communication link.
6. The method for roll calling a satellite communication terminal station as claimed in claim 5, wherein: the establishment process of the return video communication from the end station to the main station is as follows: the network management system selects two end stations Tn and Tn +1 from the list of the end stations to be called, and respectively sends back channel building parameters BP1b and BP2b to Tn and Tn +1 through a network management channel, and the Tn and Tn +1 configure a local service Modem according to the received building parameters and open a back service channel transmitting switch; after receiving the receiving state synchronization notification reported by the master station modems M1 and M2, the network management system issues multicast communication IP addresses to the video codecs of the end stations Tn and Tn +1 through a network management channel, and orders the video codecs to establish video connection with the master station video matrix, so that the return video communication from the end stations to the master station is realized.
7. The method of claim 6, wherein the method comprises: the roll calling operation comprises the following specific processes: selecting an nth end station Tn to be called through a network management system calling interface, automatically informing a main station video matrix to switch to an image of the end station Tn by a network management system background, entering a calling state, and recording the calling result information on the network management system calling interface; after the Tn roll calling is completed, selecting the next end station Tn +1, informing the video matrix to switch the image to the Tn +1 end station by the network management system background, and starting the roll calling operation on the Tn +1 end station; meanwhile, the background of the network management system informs the end station Tn to close the video coder-decoder and the Modem transceiver switch through a network management channel, and removes the end station Tn from the list of the end stations to be called; the network management system selects the next end station Tn +2 in sequence from the list of end stations to be called, sends a return link parameter BP1 and a multicast communication IP address of a video codec to the next end station, commands a Modem of the Tn +2 to open a return channel transmitting switch, commands the Tn +2 video codec and a main station video matrix to establish video connection, and enters a waiting state; and the subsequent end stations sequentially perform roll calling operation by adopting the same method until all the end stations in the list complete roll calling.
8. The satellite communication end station roll call method according to claim 1, characterized in that: in the process of roll calling all end stations, if a satellite link of a certain end station fails to be established, the network management system puts the end station at the end of a list of end stations to be roll called, and roll calling operation is performed once after roll calling of other end stations is completed; if the roll call is still unsuccessful for the second time, the network management system will end the roll call operation and record the roll call failure condition.
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| CN117614519A (en) * | 2024-01-23 | 2024-02-27 | 成都星联芯通科技有限公司 | Satellite link self-healing method and device, master station gateway and storage medium |
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| CN111526433B (en) | 2020-10-30 |
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