CN116131901A - Satellite data channel control system and method - Google Patents

Satellite data channel control system and method Download PDF

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Publication number
CN116131901A
CN116131901A CN202211444889.3A CN202211444889A CN116131901A CN 116131901 A CN116131901 A CN 116131901A CN 202211444889 A CN202211444889 A CN 202211444889A CN 116131901 A CN116131901 A CN 116131901A
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frame
control
data
queue
unit
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陈绍山
江涛
钟卫强
蔡霖腾
徐琪
嵇誉
史纪元
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First Research Institute Of Telecommunications Technology Co ltd
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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
    • H04B7/18513—Transmission in a satellite or space-based system
    • 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
    • H04B7/18515—Transmission equipment in satellites or space-based relays
    • 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
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention discloses a satellite data channel control system and a satellite data channel control method, wherein the satellite data channel control system comprises the following steps: a data protocol conversion device, wherein the data protocol conversion device specifically includes: the control interface module is used for generating a control frame and transmitting the control frame to a data interface unit in the broadband satellite transceiver through a data channel; the data flow control module is used for controlling the combined transmission of the control frame and the data frame at the bottom layer of the network; a control frame receiving queue for receiving and storing control frames from the broadband satellite transceiver direction, and a control frame transmitting queue for storing control frames to the broadband satellite transceiver and the data flow control module. The invention improves the speed of dynamic control of the satellite transceiver data channel, so that the satellite transceiver data channel can adapt to the condition of rapid change of a satellite link, and improves the overall data transmission efficiency and reliability.

Description

Satellite data channel control system and method
Technical Field
The present invention relates to the field of satellite communications technologies, and in particular, to a satellite data channel control system and method.
Background
In the satellite ground station system, a data surface information transmission path between the satellite transceiver and the ground network is generally a data channel between the satellite transceiver and the ground network, wherein the equipment in the data channel mainly comprises the satellite transceiver, data surface protocol conversion equipment, ground segment network equipment and the like, and the data channel is used for converting satellite signals into ground network data and then transmitting the ground network data to the ground network element equipment; and simultaneously, data from the ground network side is transmitted to a satellite transceiver, converted into satellite air interface data frames and then transmitted to a satellite.
In a high orbit satellite communication system, because satellite positions are relatively static, satellite communication links can keep a fixed state for a long time, parameters of a data channel are not required to be frequently adjusted, and because each satellite resource needs to be distributed to a large number of ground stations, the transmission bandwidth of each ground station is relatively low, the control response speed requirement on the data channel is low.
However, in a low orbit satellite communication system, due to the low orbit position of the satellite, the satellite moves at a high speed relative to the ground station, the satellite-to-ground communication link is always in a fast changing state, and due to the higher available bandwidth resources, the data path needs to carry higher transmission rate and more complex service, and the whole system will put higher requirements on the real-time performance of the control response of the data channel.
At present, an upper network butt joint method is mainly adopted for controlling a data channel between a satellite transceiver and a ground network, response time delay is large, the data channel can not be timely adjusted according to satellite link change conditions under a low-orbit satellite application scene, so that transmission efficiency is reduced, and control information with high real-time requirements is not considered to be directly transmitted through a data surface transmission channel at a network bottom layer. In addition, the method needs to configure a special physical interface, and the complexity of a hardware interface is increased in a satellite multichannel application scene.
Disclosure of Invention
The invention provides a data channel control method and a data channel control system, which mainly aim at controlling a data channel between a broadband satellite transceiver and a ground network so as to solve the problem of controlling the response speed of a data channel in a high-speed satellite data transmission scene and enable the data channel to be quickly adapted to the change condition of a satellite link.
To solve the above technical problem, in a first aspect, an embodiment of the present invention provides a satellite data channel control system, including:
a data protocol conversion device, wherein,
the data protocol conversion device specifically comprises:
the control interface module is used for generating a control frame and transmitting the control frame to a data interface unit in the broadband satellite transceiver through a data channel;
the data flow control module is used for controlling the combined transmission of the control frame and the data frame at the bottom layer of the network;
a control frame receive queue for receiving and storing control frames from the broadband satellite transceiver direction,
a control frame transmit queue for storing control frames destined for the broadband satellite transceiver and the data flow control module.
Specifically, the interface control module generates a new uplink control frame according to the downlink control frame receiving information or user signaling of the upper computer, wherein the uplink control frame mainly comprises control parameters of a data channel, and the control parameters comprise a sending period, a queue capacity and a network interface rate and are used for adjusting the working state of the data channel.
Further, the data flow control module is further configured to:
in the uplink transmission channel, checking a current control frame transmission window according to the current transmission state of the data service data frame, calculating the transmission time of the control frame and the data quantity of the data service frame, and writing the control frame into a satellite side transmission queue; and reading the transmission frame from the satellite side in the downlink data channel, reading the frame type information and the control frame unique word information, and if the control frame type is the control frame type, writing the corresponding frame into a control frame receiving queue.
Further preferably, the data flow control module inserts control frames into the service data stream according to a fixed time period to realize the combined transmission of the control frames and the data service data frames at the bottom layer of the network, and specifically includes:
for calling system function and obtaining current system clock count value SCC cur Is a first unit of (a);
a second unit for comparing the difference value of the count value with a preset processing period value, and performing the following operations:
when SCC cur -SCC prev ≥SCC period At the time, SCC cur Entering a third unit as the starting time of the next processing period;
when SCC cur -SCC prew ＜SCC period When the operation is not performed, ending;
wherein SCC cur The current system clock count value is obtained from a first unit; SCC (SCC) prev The starting time of the previous processing period is updated by a fourteenth unit of the previous processing period; SCC (SCC) period The count value corresponding to the processing cycle time is obtained;
a third unit for counting the data amount of the data service data frame waiting to be sent in the current data plane protocol processing module;
a fourth unit for calculating a transmission window value of the service data frame applied to the current processing period, wherein the calculation method of the fourth unit is as follows:
Figure BDA0003949821570000041
wherein:
W data the unit is byte for sending window value of current period service data;
R sat_link the transmission rate of the current satellite link is in bytes/second;
R eth_link the transmission rate of the current ground network interface is in bytes/second;
T proc the unit is second for data processing period value;
S data the unit is bytes, and the parameter is obtained from a third unit;
W adj for adjusting the window value, the unit is byte, the value size depends on the frame transmission condition of the service data plane and the control plane of the previous period, and the window value is set in the thirteenth unit of the previous period;
a fifth unit for writing the service data frames into the satellite side transmission queue in batch according to the service data frame transmission window value;
a sixth unit for counting total length of transmission control frame, namely current data amount in the satellite side transmission queue, wherein the unit is byte, and the length of the control frame in the queue is recorded as CFL i The index i indicates the sequence number of the control frame in the queue, and the total length of the control frame is recorded as
Figure BDA0003949821570000042
i=1 represents the first frame of the queue, i=n is the last frame of the queue;
a seventh unit for calculating a transmission window value of the control frame, the calculation method of the seventh unit is as follows:
Figure BDA0003949821570000043
wherein:
W ctrl a sending window value of a control frame is in bytes;
to when n>0 and 0
Figure BDA0003949821570000051
When the method is used, dequeuing operation is carried out for all control frames in the queue, a frame buffer space is applied, a frame pointer is generated and written into a satellite side transmission queue;
when n is>0 and 0
Figure BDA0003949821570000052
When it is, it will satisfy->
Figure BDA0003949821570000054
And->
Figure BDA0003949821570000053
An eighth unit that performs a dequeue operation for the first k control frames of (a);
judging whether the first frame in the current control frame queue waits for overtime, if not, ending the sending operation of the period, and turning to a twelfth unit for execution; turning to a ninth unit executed by the tenth unit if the time-out is over;
timeout control frame length S to if additionally transmitted extra If the control transmission window is not exceeded by half, the control transmission window is transferred to a twelfth unit for execution, otherwise, the control transmission window is transferred to a tenth unit for execution by an eleventh unit;
to dequeue the current queue head control frame and accumulate the frame length to S extra Returning to the eleventh unit executed by the ninth unit;
for executing queue update, discarding all non-sent timeout control frames in the queue, and waiting time T of all remaining non-timeout control frames wait Increase T proc A twelfth unit of (2);
adjusting window value W for the next period adj Updated to S extra Thirteenth sheet of (2)A meta-element;
to SCC prev Updating to SCC cur Fourteenth unit of (2).
In a second aspect, in order to solve the technical problem of the embodiment of the present invention, the embodiment of the present invention further provides a satellite data channel control method, where the method includes:
s201, a control interface module generates a new uplink control frame according to downlink control frame receiving information or user signaling of an upper computer, wherein the uplink control frame comprises control parameters of a data channel, and the control parameters comprise a sending period, a queue capacity and a network interface rate so as to adjust the working state of the data channel;
s202, a control interface module accesses a control frame transmission queue, if the control frame transmission queue is full, the control frame at the head of the queue is discarded, a pointer at the head of the queue is retracted to a position, and then a new control frame is written into the tail of the queue;
s203, the data flow control module checks a current control frame sending window according to the current transmission state of the data service, and calculates the time of the control frame out of the queue and the transmitted data service volume;
s204, the data flow control module encapsulates the uplink control frame according to the Ethernet frame format, applies for the memory space to the frame buffer management module and stores the memory space, generates a frame address pointer, and executes the enqueuing operation of the satellite side transmission queue;
s205, the satellite side sending queue extracts the control frame corresponding to the frame buffer management module according to the frame address pointer, and transmits the control frame to the multi-rate network card in a direct memory access mode, and sends the control frame to the data interface unit of the satellite transceiver.
Further, the step S203 specifically includes:
s401, calling a system function to acquire a current system clock count value SCC cur ；
S402, comparing the difference value of the count value with a preset processing period value, and performing the following operations:
when SCC cur -SCC prev ≥SCC period At the time, SCC cur As the starting point of the next processing cycle,enter S403;
when SCC cur -SCC prev ＜SCC period When the operation is not performed, ending;
wherein SCC cur The current system clock count value is obtained in S401; SCC (SCC) prev Updating in the step S414 of the previous processing cycle, wherein the starting time of the previous processing cycle is the starting time of the previous processing cycle; SCC (SCC) period The count value corresponding to the processing cycle time is obtained;
s403, counting the data frame quantity of the service data waiting to be transmitted in the current data surface protocol processing module;
s404, calculating a service data frame transmission window value applied to the current processing period, wherein the calculation method comprises the following steps:
Figure BDA0003949821570000061
wherein:
W data the unit is byte for sending window value of current period service data;
R sat_link the transmission rate of the current satellite link is in bytes/second;
R eth_link the transmission rate of the current ground network interface is in bytes/second, if a gigabit Ethernet interface is adopted, the parameter is 125 Mbytes/second;
T proc the unit is second for data processing period value;
S data the unit is bytes, and the parameters are obtained from S403;
W adj for adjusting the window value, the unit is byte, the value size depends on the frame transmission condition of the service data plane and the control plane of the previous period, and the setting is performed in the S413 of the previous period;
s405, writing the business data frames into a satellite side transmission queue in batches according to the business data frame transmission window value;
s406, counting total length of transmission control frame, namely current data quantity in transmission queue, with unit being byteThe length of the control frame in the queue is recorded as CFL i The index i indicates the sequence number of the control frame in the queue, and the total length of the control frame is recorded as
Figure BDA0003949821570000071
i=1 represents the first frame of the queue, i=n is the last frame of the queue;
s407, calculating a transmission window value of the control frame, wherein the calculation method is as follows:
Figure BDA0003949821570000072
wherein:
W ctrl a sending window value of a control frame is in bytes;
s408, when n>0 and 0
Figure BDA0003949821570000073
When the method is used, dequeuing operation is carried out for all control frames in the queue, a frame buffer space is applied, a frame pointer is generated and written into a satellite side transmission queue;
when n is>0 and 0
Figure BDA0003949821570000074
When it is, it will satisfy->
Figure BDA0003949821570000076
And->
Figure BDA0003949821570000075
Performs a dequeue operation for the first k control frames of (c),
s409, judging whether the first frame in the current control frame queue waits for timeout, if not, ending the sending operation of the period, and turning to S412; if it is time out then it goes to S410,
s410, if the additional transmission is overtime control frame length S extra If the control transmission window is not exceeded by half, the process goes to S412, otherwise, the process goes to S411;
s411, dequeuing the current queue head control frame and accumulating the frame lengthAdded to S extra Returning to S409;
s412, executing the queue update, discarding all the non-sent overtime control frames in the queue, and waiting time T of all the remaining non-overtime control frames wait Increase T proc ；
S413, adjusting the window value W of the next period adj Updated to S extra ；
S414, SCC prev Updating to SCC cur 。
Further, the method further comprises:
s301, a data interface unit of a satellite transceiver writes current satellite link working state parameters into an information field of a control frame, wherein the working state parameters comprise a modulation coding mode, a signal bandwidth and the number of channels, and fills frame header information to generate a downlink control frame to be sent to data protocol conversion equipment;
s302, the data protocol conversion equipment receives a control frame through a multi-rate network card and stores the control frame into a frame management module;
s303, the frame management module checks the Ethernet frame header address, type and length information of the control frame, generates a frame descriptor and writes an address pointer into a satellite side receiving queue;
s304, the data flow control module reads the data frame from the satellite side receiving queue, reads the frame type information and the control frame unique word information, and if the data frame is of the control frame type, writes the frame into the control frame receiving queue;
s305, the control interface module obtains the control frame from the control frame receiving queue in a polling mode, reads field information such as the address, the type, the unique word, the length and the like of the frame, compares the field information with a preset parameter table to judge the correctness of the received control frame, reads the satellite link parameters in the information field, and stores the satellite link parameters in a local parameter list.
Compared with the prior art, the embodiment of the invention has the following advantages: the speed of dynamic control of the satellite transceiver data channel is improved, so that the satellite transceiver data channel can adapt to the rapid change of a satellite link, and the overall data transmission efficiency and reliability are improved. Meanwhile, the control information is directly transmitted in the data channel, so that a special high-speed control interface is not required to be additionally arranged, and the complexity of a hardware interface is further reduced.
Drawings
Specific embodiments of the present invention will be described below by way of example with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a satellite data channel control system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a satellite data channel control method according to an embodiment of the invention;
FIG. 3 is a flowchart of another satellite data channel control method according to an embodiment of the present invention;
FIG. 4 is a flowchart of another satellite data channel control method according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
According to the control method for the data path between the broadband satellite transceiver and the ground network, provided by the embodiment of the invention, the control frame between the satellite transceiver and the upper network equipment is inserted into the data acceleration channel and is combined with the service data for transmission, so that the working parameters of each equipment on the data path can be quickly adjusted, and the upper network equipment can quickly respond according to the change condition of the satellite link.
In order to achieve the object of the present invention, an embodiment of the present invention provides a satellite data channel control system, including:
a data protocol conversion device, wherein,
the data protocol conversion device specifically comprises:
the control interface module is used for generating a control frame and transmitting the control frame to a data interface unit in the broadband satellite transceiver through a data channel;
the data flow control module is used for controlling the combined transmission of the control frame and the data frame at the bottom layer of the network;
a control frame receive queue for receiving and storing control frames from the broadband satellite transceiver direction,
a control frame transmit queue for storing control frames destined for the broadband satellite transceiver and the data flow control module.
Specifically, the interface control module generates a new uplink control frame according to the downlink control frame receiving information or user signaling of the upper computer, wherein the uplink control frame mainly comprises control parameters of a data channel, and the control parameters comprise a sending period, a queue capacity and a network interface rate and are used for adjusting the working state of the data channel.
Further, the data flow control module is further configured to:
in the uplink transmission channel, checking a current control frame transmission window according to the current transmission state of the data service data frame, calculating the transmission time of the control frame and the data quantity of the data service frame, and writing the control frame into a satellite side transmission queue; and reading the transmission frame from the satellite side in the downlink data channel, reading the frame type information and the control frame unique word information, and if the control frame type is the control frame type, writing the corresponding frame into a control frame receiving queue.
Further preferably, the data flow control module inserts control frames into the service data stream according to a fixed time period to realize the combined transmission of the control frames and the data service data frames at the bottom layer of the network, and specifically includes:
for calling system function and obtaining current system clock count value SCC cur Is a first unit of (a);
a second unit for comparing the difference value of the count value with a preset processing period value, and performing the following operations:
when SCC cur -SCC prev ≥SCC period At the time, SCC cur Entering a third unit for execution as the starting time of the next processing period;
when SCC cur -SCC prev ＜SCC period When the operation is not performed, ending;
wherein SCC cur The current system clock count value is obtained from a first unit; SCC (SCC) prev The starting time of the previous processing period is updated by a fourteenth unit of the previous processing period; SCC (SCC) period The count value corresponding to the processing cycle time is obtained;
a third unit for counting the data amount of the data service data frame waiting to be sent in the current data plane protocol processing module;
a fourth unit for calculating a transmission window value of the service data frame applied to the current processing period, wherein the calculation method of the fourth unit is as follows:
Figure BDA0003949821570000111
wherein:
W data the unit is byte for sending window value of current period service data;
R sat_link the transmission rate of the current satellite link is in bytes/second;
R eth_link the transmission rate of the current ground network interface is in bytes/second;
T proc the unit is second for data processing period value;
S data the unit is bytes, and the parameter is obtained from a third unit;
W adj for adjusting the window value, the unit is byte, the value size depends on the frame transmission condition of the service data plane and the control plane of the previous period, and the window value is set in the thirteenth unit of the previous period;
a fifth unit for writing the service data frames into the satellite side transmission queue in batch according to the service data frame transmission window value;
a sixth unit for counting total length of transmission control frame, namely current data amount in the satellite side transmission queue, wherein the unit is byte, and the length of the control frame in the queue is recorded as CFL i The index i indicates the sequence number of the control frame in the queue, and the total length of the control frame is recorded as
Figure BDA0003949821570000121
i=1 represents the first frame of the queue, i=n is the last frame of the queue;
a seventh unit for calculating a transmission window value of the control frame, the calculation method of the seventh unit is as follows:
Figure BDA0003949821570000122
wherein:
W ctrI a sending window value of a control frame is in bytes;
to when n>0 and 0
Figure BDA0003949821570000123
When the method is used, dequeuing operation is carried out for all control frames in the queue, a frame buffer space is applied, a frame pointer is generated and written into a satellite side transmission queue;
when n is>0 and 0
Figure BDA0003949821570000124
When it is, it will satisfy->
Figure BDA0003949821570000126
And->
Figure BDA0003949821570000125
An eighth unit that performs a dequeue operation for the first k control frames of (a);
judging whether the first frame in the current control frame queue waits for overtime, if not, ending the sending operation of the period, and turning to a twelfth unit for execution; turning to a ninth unit executed by the tenth unit if the time-out is over;
timeout control frame length S to if additionally transmitted extra Not exceeding half of the control transmission window, going to the twelfth unit for execution, otherwise going to the tenth unit for executionA meta-element;
to dequeue the current queue head control frame and accumulate the frame length to S extra Returning to the eleventh unit executed by the ninth unit;
for executing queue update, discarding all non-sent timeout control frames in the queue, and waiting time T of all remaining non-timeout control frames wait Increase T proc A twelfth unit of (2);
adjusting window value W for the next period adj Updated to S extra A thirteenth unit of (2);
to SCC prev Updating to SCC cur Fourteenth unit of (2).
Here, in order to facilitate understanding of the control method of satellite data channel transmission in the embodiment of the present invention, as shown in fig. 1, the following description will be given to the relevant service modules in the entire satellite data channel:
a broadband satellite transceiver 101, as a communication device interacting with a space segment satellite, receives a data frame from a ground network device, performs digital processing procedures such as frame disassembly, baseband frame grouping, encoding, modulation and the like, and then converts the data frame into a satellite transmission data frame to be transmitted to the space segment satellite; on the other hand, receiving the data frames from the space segment satellite, performing digital processing processes such as demodulation, decoding, baseband frame demodulation, framing and the like, converting the data frames into network data frames, and transmitting the network data frames to ground network equipment;
the broadband satellite transceiver 101 includes:
the digital baseband processing unit 102 is used for completing the digital baseband processing process of the uplink and downlink signals of the satellite, including the processes of modulation and demodulation, encoding and decoding, clock and carrier synchronization, and the like;
a data interface unit 103 for completing the conversion process between the network device data frame and the satellite baseband data frame;
the data protocol conversion device 201 is an intermediate conversion device of a data channel, is a front network device of a broadband satellite transceiver on a ground network side, and is used for completing data plane protocol conversion between a ground network and a satellite network and controlling the data channel at the same time;
the data protocol conversion device 201 specifically includes:
the control interface module 203 is configured to parse information fed back by the broadband satellite transceiver 101, generate a control frame, send the control frame to the data interface unit 103 in the broadband satellite transceiver 101 through a data channel, and control and adjust parameters of a network bottom layer respectively to adapt to a change of a link, and simultaneously maintain a control interface between an upper computer and the control interface: on one hand, the information of the data path is fed back to the upper computer for user interface presentation; on the other hand, receiving control strategy parameters of the data path and updating a local control parameter set;
the data flow control module 206 is used for realizing the transmission of two data flows of a control surface and a data surface on a network bottom layer, and realizing the combination process of double flows by a multi-queue polling scheduling method;
a control frame receiving queue 204 for receiving and storing control frames from the direction of the broadband satellite transceiver 101, a data flow control module 206 for controlling the writing operation and part of parameter adjustment, and a control interface module 203 for controlling the reading operation;
a control frame transmission queue 205 for storing control frames addressed to the broadband satellite transceiver 101 and the data flow control module 206, the data flow control module 206 controlling its read-out operation and partial parameter adjustment, the control interface module 203 controlling its write operation;
the data plane protocol processing module 207 converts the service data stream from the ground network format to the satellite network format in the uplink direction, and vice versa in the downlink direction;
a frame buffer management module 202, configured to manage a physical storage area of an ethernet data frame, and provide an address space of an ethernet data frame entity for the frame management module 213, the data flow control module 206, and the data plane protocol processing module 207;
a satellite side receiving queue 208 for completing the queuing and storing of the Ethernet data frames from the broadband satellite transceiver 101 and providing an application layer access interface;
a satellite side transmission queue 209 for completing the queuing and storing of the ethernet data frames from the application layer and the broadband to the satellite transceiver 101 and providing an application layer access interface;
the ground network side receives the queue 210 to complete the queuing and storage of the Ethernet data frames from the ground network equipment;
a ground network side transmission queue 211 for completing queuing storage of ethernet data frames from the application layer to the ground network device;
a multi-rate network card 212, which completes the processing procedure of the physical layer and the data link layer of the Ethernet interface;
the frame management module 213 completes the frame descriptor generation, frame data buffering, frame header parsing, frame classification and enqueuing of the satellite side receiving queue of the ethernet data frame on the receiving channel; completing the dequeuing of a satellite side transmission queue and the frame checksum on a transmission channel and transmitting the dequeuing and the frame checksum to a multi-rate network card;
the upper computer 301 runs a user side control program of the broadband satellite transceiver 101, and is used for receiving a user instruction to generate satellite transceiver control information and processing corresponding feedback information;
the ground network switch 401 is located in a ground station of the satellite communication system, and is used for connecting the ground network device and the satellite device, and is an access point of the ground network and the satellite network.
Different from the control method of the traditional satellite ground station data channel, the embodiment of the invention ensures that the control plane information inserting operation is 'insensitive' to the data plane transmission by dynamically adjusting the time of the control plane information inserting and the data quantity of the inserting through the method of carrying out the combined transmission of the control frame and the service data at the bottom layer of the network data acceleration channel. Meanwhile, under the condition that the high-speed service data is instantaneously high in speed, appropriate avoidance is carried out, so that the control plane information can be normally transmitted.
The workflow provided by the embodiment of the invention comprises an uplink channel direction which is sent from the data protocol conversion device to the satellite transceiver and a downlink channel direction which is sent from the satellite transceiver to the data protocol conversion device.
The workflow in the upstream channel direction is as shown in fig. 2:
s201, a control interface module generates a new uplink control frame according to downlink control frame receiving information or user signaling of an upper computer, wherein the uplink control frame mainly comprises control parameters of a data channel, and the control parameters comprise a sending period, queue capacity, network interface rate and the like and are used for adjusting the working states of all sub-modules of the data channel;
on one hand, new control parameters are generated according to satellite link parameter change conditions such as satellite channel bandwidth, modulation coding mode and the like in the downlink control frame, and an uplink control frame is generated; on the other hand, the user signaling packet of the upper computer is received, and the corresponding control parameters are read to generate an uplink control frame, wherein the format of the control frame is as follows:
target address (6 bytes) Source Address (6 bytes) Frame type (2 bytes) Control frame unique word (4 bytes) Frame length (2 bytes) Control information (40-1024 bytes) Check field (4 bytes)
The length of the target address is 6 bytes, and the filling content can adopt the MAC address of the data network port of the target equipment;
the length of the source address is 6 bytes, and the filling content can adopt the MAC address of the data network port of the source equipment;
the frame type length is 2 bytes, and the filling content is 0x8A and 0x01;
control frame unique word: 4 bytes in length, 0xA3, 0xB5, 0xC5, 0xAD filled;
frame length: the length is 2 bytes, the unit is bytes, and the length of the control information frame is marked;
control information: the length is variable, the range is 40-1024 bytes, the uplink channel is filled with control parameters of all sub-modules on the data channel, and the downlink channel is filled with satellite link parameters and state information of all sub-modules of the data channel.
The above is only one example of a control frame, the format of which may be adapted to the needs of the actual implementation.
S202, the control interface module accesses a control frame transmission queue, if the control frame transmission queue is full, the control frame at the head of the queue is discarded, the pointer at the head of the queue is retracted to a position, and then a new control frame is written into the tail of the queue;
s203, the data flow control module checks a current control frame sending window according to the current transmission state of the data plane service, and calculates the time and the data volume of the control frame out of the queue;
s204, the data flow control module encapsulates the uplink control frame according to the Ethernet frame format, applies for the memory space to the frame buffer management module and stores the memory space, generates a frame address pointer, and executes the enqueuing operation of the satellite side transmission queue;
s205, the satellite side sending queue extracts the control frame corresponding to the frame buffer management module according to the frame address pointer, and transmits the control frame to the multi-rate network card in a direct memory access mode, and sends the control frame to the data interface unit of the satellite transceiver.
For the workflow in the downstream channel direction, as shown in fig. 3:
s301, a data interface unit of a satellite transceiver writes the current satellite link working state parameters such as a modulation coding mode, a signal bandwidth, the number of channels and the like into an information field of a control frame, fills frame header information such as an address, a length and the like to generate a downlink control frame, and sends the downlink control frame to data protocol conversion equipment;
s302, the data protocol conversion equipment receives a control frame through a multi-rate network card and stores the control frame into a frame management module;
s303, the frame management module checks the Ethernet frame header address, type and length information of the control frame, generates a frame descriptor and writes the frame descriptor into a satellite side receiving queue;
s304, the data flow control module reads a data frame from the satellite side receiving queue, reads frame type information and control frame unique word information, and if the data frame is of a control frame type, writes the frame into the control frame receiving queue;
s305, the control interface module obtains the control frame from the control frame receiving queue in a polling mode, reads field information such as the address, the type, the unique word, the length and the like of the frame, compares the field information with a preset parameter table to judge the correctness of the received control frame, reads the satellite link parameters in the information field, and stores the satellite link parameters in a local parameter list.
The data flow control module is used for controlling the transmission process of two data flows of a control plane and a data plane in a network bottom layer, and dynamically adjusting the quantity of the inserted control information by monitoring the instantaneous change of the data flow in the direction of the satellite side: the process of inserting the control frame into the service data stream is processed according to a fixed time period, in each processing period, the service data forwarding in the data protocol conversion module is processed first, and then the control frame is forwarded, and the working flow is as shown in fig. 4:
s401, calling a system function to acquire a current system clock count value SCC cur ；
S402, comparing the difference value of the count value with a preset processing period value, and performing the following operations:
when SCC cur -SCC prev ≥SCC period At the time, SCC cur As the start time of the next processing cycle, the process advances to S403;
when SCC cur -SCC prev ＜SCC period When the operation is not performed, ending;
wherein SCC cur The current system clock count value is obtained in S401;SCC prev updating in the step S414 of the previous processing cycle, wherein the starting time of the previous processing cycle is the starting time of the previous processing cycle; SCC (SCC) period The count value corresponding to the processing cycle time is obtained;
s403, counting the data quantity of the service data frames waiting to be sent in the current data surface protocol processing module;
s404, calculating a service data frame transmission window value applied to the current processing period, wherein the calculation method comprises the following steps:
Figure BDA0003949821570000171
wherein:
W data the unit is byte for sending window value of current period service data;
R sat_link the transmission rate of the current satellite link is in bytes/second;
R eth_link the transmission rate of the current ground network interface is in bytes/second, if a gigabit Ethernet interface is adopted, the parameter is 125 Mbytes/second;
T proc the unit is second for data processing period value;
S data the unit is bytes, and the parameter is obtained from S403;
W adj for adjusting the window value, the unit is byte, the value size depends on the frame transmission condition of the service data plane and the control plane of the previous period, and the setting is performed in the S413 of the previous period;
s405, writing the business data frames into a satellite side transmission queue in batches according to the business data frame transmission window value;
s406, counting total length of the transmission control frame, namely current data quantity in the transmission queue, wherein the unit is bytes, and marking the length of the control frame in the queue as CFL i The index i indicates the sequence number of the control frame in the queue, and the total length of the control frame is recorded as
Figure BDA0003949821570000181
i＝1Representing the first frame of the queue, i=n being the last frame of the queue;
s407, calculating a transmission window value of the control frame, wherein the calculation method is as follows:
Figure BDA0003949821570000182
wherein:
W ctrl a sending window value of a control frame is in bytes;
s408, when n>0 and 0
Figure BDA0003949821570000183
When the method is used, dequeuing operation is carried out for all control frames in the queue, a frame buffer space is applied, a frame pointer is generated and written into a satellite side transmission queue;
when n is>0 and 0
Figure BDA0003949821570000184
When it is, it will satisfy->
Figure BDA0003949821570000186
And->
Figure BDA0003949821570000185
Performs a dequeue operation for the first k control frames of (c),
s409, judging whether the first frame in the current control frame queue waits for timeout, if not, ending the sending operation of the period, and turning to S412; if it is time out then it goes to S410,
s410, if the additional transmission is overtime control frame length S extra If the control transmission window is not exceeded by half, the process goes to S412, otherwise, the process goes to S411;
s411, dequeuing the current queue head control frame and accumulating the frame length to S extra Returning to S409;
s412, executing the queue update, discarding all the non-sent overtime control frames in the queue, and waiting time T of all the remaining non-overtime control frames wait Increase T proc ；
S413, adjusting the window value W of the next period adj Updated to S extra ；
S414, SCC prev Updating to SCC cur 。
Compared with the prior art, the embodiment of the invention has the following advantages: the speed of dynamic control of the satellite transceiver data channel is improved, so that the satellite transceiver data channel can adapt to the rapid change of a satellite link, and the overall data transmission efficiency and reliability are improved. Meanwhile, the control information is directly transmitted in the data channel, so that a special high-speed control interface is not required to be additionally arranged, and the complexity of a hardware interface is further reduced.
The present embodiment is only exemplary of the present patent, and does not limit the scope of protection thereof, and those skilled in the art may also change the part thereof, so long as the spirit of the present patent is not exceeded, and the present patent is within the scope of protection thereof.

Claims (7)

1. A satellite data channel control system, the system comprising:
a data protocol conversion device, wherein,
the data protocol conversion device specifically comprises:
the control interface module is used for generating a control frame and transmitting the control frame to a data interface unit in the broadband satellite transceiver through a data channel;
the data flow control module is used for controlling the combined transmission of the control frame and the data frame at the bottom layer of the network;
a control frame receive queue for receiving and storing control frames from the broadband satellite transceiver direction,
a control frame transmit queue for storing control frames destined for the broadband satellite transceiver and the data flow control module.
2. The satellite data channel control system according to claim 1, wherein the interface control module generates a new uplink control frame according to the downlink control frame receiving information or user signaling of the host computer, the uplink control frame mainly including control parameters of the data channel, the control parameters including a transmission period, a queue capacity, and a network interface rate, and the control parameters are used for adjusting an operating state of the data channel.
3. The satellite data channel control system of claim 2, wherein the data flow control module is further configured to:
in the uplink transmission channel, checking a current control frame transmission window according to the current transmission state of the data service data frame, calculating the transmission time of the control frame and the data quantity of the data service frame, and writing the control frame into a satellite side transmission queue; and reading the transmission frame from the satellite side receiving queue in the downlink data channel, reading frame type information and control frame unique word information, and if the transmission frame is of a control frame type, writing the corresponding frame into the control frame receiving queue.
4. The satellite data channel control system according to claim 3, wherein the data flow control module inserts control frames into the service data stream according to a fixed time period to realize the combined transmission of the control frames and the data service data frames at the network bottom layer, and specifically comprises:
for calling system function and obtaining current system clock count value SCC cur Is a first unit of (a);
a second unit for comparing the difference value of the count value with a preset processing period value, and performing the following operations:
when SCC cur -SCC prev ≥SCC period At the time, SCC cur Entering a third unit for execution as the starting time of the next processing period;
when SCC cur -SCC prev ＜SCC period When the operation is not performed, ending;
wherein SCC cur The current system clock count value is obtained from a first unit; SCC (SCC) prev The starting time of the previous processing period is updated by a fourteenth unit of the previous processing period; SCC (SCC) period The count value corresponding to the processing cycle time is obtained;
a third unit for counting the data amount of the data service data frame waiting to be sent in the current data plane protocol processing module;
a fourth unit for calculating a transmission window value of the service data frame applied to the current processing period, wherein the calculation method of the fourth unit is as follows:
Figure FDA0003949821560000021
wherein:
W data the unit is byte for sending window value of current period service data;
R sat_link the transmission rate of the current satellite link is in bytes/second;
R eth_link the transmission rate of the current ground network interface is in bytes/second;
T proc the unit is second for data processing period value;
S data the unit is bytes, and the parameter is obtained from a third unit;
W adj for adjusting the window value, the unit is byte, the value size depends on the frame transmission condition of the service data plane and the control plane of the previous period, and the window value is set in the thirteenth unit of the previous period;
a fifth unit for writing the service data frames into the satellite side transmission queue in batch according to the service data frame transmission window value;
a sixth unit for counting total length of transmission control frame, namely current data amount in the satellite side transmission queue, wherein the unit is byte, and the length of the control frame in the queue is recorded as CFL i The index i indicates the sequence number of the control frame in the queue, and the total length of the control frame is recorded as
Figure FDA0003949821560000031
i=1 represents the first frame of the queue, i=n is the last frame of the queue;
a seventh unit for calculating a transmission window value of the control frame, the calculation method of the seventh unit is as follows:
Figure FDA0003949821560000032
wherein:
W ctrl a sending window value of a control frame is in bytes;
to when n>0 and 0
Figure FDA0003949821560000033
When the method is used, dequeuing operation is carried out for all control frames in the queue, a frame buffer space is applied, a frame pointer is generated and written into a satellite side transmission queue;
when n is>0 and 0
Figure FDA0003949821560000034
When it is, it will satisfy->
Figure FDA0003949821560000035
And->
Figure FDA0003949821560000036
An eighth unit that performs a dequeue operation for the first k control frames of (a);
judging whether the first frame in the current control frame queue waits for overtime, if not, ending the sending operation of the period, and turning to a twelfth unit for execution; turning to a ninth unit executed by the tenth unit if the time-out is over;
timeout control frame length S to if additionally transmitted extra If the control transmission window is not exceeded by half, the control transmission window is transferred to a twelfth unit for execution, otherwise, the control transmission window is transferred to a tenth unit for execution by an eleventh unit;
to dequeue the current queue head control frame and accumulate the frame length to S extra Returning to the eleventh unit executed by the ninth unit;
for performing a queue update of the data in the data storage device,discarding all non-sent overtime control frames in the queue, and waiting time T of all remaining non-overtime control frames wait Increase T proc A twelfth unit of (2);
adjusting window value W for the next period adj Updated to S extra A thirteenth unit of (2);
to SCC prev Updating to SCC cur Fourteenth unit of (2).
5. A method for controlling a satellite data channel, the method comprising:
s201, a control interface module generates a new uplink control frame according to downlink control frame receiving information or user signaling of an upper computer, wherein the uplink control frame comprises control parameters of a data channel, and the control parameters comprise a sending period, a queue capacity and a network interface rate so as to adjust the working state of the data channel;
s202, a control interface module accesses a control frame transmission queue, if the control frame transmission queue is full, the control frame at the head of the queue is discarded, a pointer at the head of the queue is retracted to a position, and then a new control frame is written into the tail of the queue;
s203, the data flow control module checks a current control frame sending window according to the current transmission state of the data service, and calculates the time of the control frame out of the queue and the transmitted data service volume;
s204, the data flow control module encapsulates the uplink control frame according to the Ethernet frame format, applies for the memory space to the frame buffer management module and stores the memory space, generates a frame address pointer, and executes the enqueuing operation of the satellite side transmission queue;
s205, the satellite side sending queue extracts the control frame corresponding to the frame buffer management module according to the frame address pointer, and transmits the control frame to the multi-rate network card in a direct memory access mode, and sends the control frame to the data interface unit of the satellite transceiver.
6. The method for controlling an uplink channel of a satellite data channel as claimed in claim 5, wherein said step S203 specifically comprises:
s401, calling a system function to acquire a current system clock count value SCC cur ；
S402, comparing the difference value of the count value with a preset processing period value, and performing the following operations:
when SCC cur -SCC prev ≥SCC period At the time, SCC cur As the start time of the next processing cycle, the process advances to S403;
when SCC cur -SCC prev ＜SCC period When the operation is not performed, ending;
wherein SCC cur The current system clock count value is obtained in S401; SCC (SCC) prev Updating in the step S414 of the previous processing cycle, wherein the starting time of the previous processing cycle is the starting time of the previous processing cycle; SCC (SCC) period The count value corresponding to the processing cycle time is obtained;
s403, counting the data frame quantity of the service data waiting to be transmitted in the current data surface protocol processing module;
s404, calculating a service data frame transmission window value applied to the current processing period, wherein the calculation method comprises the following steps:
Figure FDA0003949821560000051
wherein:
W data the unit is byte for sending window value of current period service data;
R sat_link the transmission rate of the current satellite link is in bytes/second;
R eth_link the transmission rate of the current ground network interface is in bytes/second, if a gigabit Ethernet interface is adopted, the parameter is 125 Mbytes/second;
T proc the unit is second for data processing period value;
S data the unit is bytes, and the parameters are obtained in S403, which are the total data frame quantity of the current service data to be processed;
W adj to adjust the window value, the unit is bytesThe value of the value depends on the frame transmission condition of the service data plane and the control plane of the previous period, and the setting is carried out in the S413 of the previous period;
s405, writing the business data frames into a satellite side transmission queue in batches according to the business data frame transmission window value;
s406, counting total length of the transmission control frame, namely current data quantity in the transmission queue, wherein the unit is bytes, and marking the length of the control frame in the queue as CFL i The index i indicates the sequence number of the control frame in the queue, and the total length of the control frame is recorded as
Figure FDA0003949821560000061
i=1 represents the first frame of the queue, i=n is the last frame of the queue;
s407, calculating a transmission window value of the control frame, wherein the calculation method is as follows:
Figure FDA0003949821560000062
wherein:
W ctrl a sending window value of a control frame is in bytes;
s408, when n>0 and 0
Figure FDA0003949821560000063
When the method is used, dequeuing operation is carried out for all control frames in the queue, a frame buffer space is applied, a frame pointer is generated and written into a satellite side transmission queue;
when n is>0 and 0
Figure FDA0003949821560000064
When it is, it will satisfy->
Figure FDA0003949821560000065
And->
Figure FDA0003949821560000066
Performs a dequeue operation for the first k control frames of (c),
s409, judging whether the first frame in the current control frame queue waits for timeout, if not, ending the sending operation of the period, and turning to S412; if it is time out then it goes to S410,
s410, if the additional transmission is overtime control frame length S extra If the control transmission window is not exceeded by half, the process goes to S412, otherwise, the process goes to S411;
s411, dequeuing the current queue head control frame and accumulating the frame length to S extra Returning to S409;
s412, executing the queue update, discarding all the non-sent overtime control frames in the queue, and waiting time T of all the remaining non-overtime control frames wait Increase T proc ；
S413, adjusting the window value W of the next period adj Updated to S extra ；
S414, SCC prev Updating to SCC cur 。
7. The satellite data channel downstream channel control method of claim 5, further comprising:
s301, a data interface unit of a satellite transceiver writes current satellite link working state parameters into an information field of a control frame, wherein the working state parameters comprise a modulation coding mode, a signal bandwidth and the number of channels, and fills frame header information to generate a downlink control frame to be sent to data protocol conversion equipment;
s302, the data protocol conversion equipment receives a control frame through a multi-rate network card and stores the control frame into a frame management module;
s303, the frame management module checks the Ethernet frame header address, type and length information of the control frame, generates a frame descriptor and writes the frame descriptor into a satellite side receiving queue;
s304, the data flow control module reads a data frame from the satellite side receiving queue, reads frame type information and control frame unique word information, and if the data frame is of a control frame type, writes the frame into the control frame receiving queue;
s305, the control interface module obtains the control frame from the control frame receiving queue in a polling mode, reads field information such as the address, the type, the unique word, the length and the like of the frame, compares the field information with a preset parameter table to judge the correctness of the received control frame, reads the satellite link parameters in the information field, and stores the satellite link parameters in a local parameter list.
CN202211444889.3A 2022-11-18 2022-11-18 Satellite data channel control system and method Pending CN116131901A (en)

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CN118018629A (en) * 2024-04-07 2024-05-10 广州天奕技术股份有限公司 Millimeter wave data stream slicing processing method, device and equipment
CN118295789A (en) * 2024-06-05 2024-07-05 之江实验室 Remote measuring and controlling system, method and device, storage medium and electronic equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117614521A (en) * 2024-01-24 2024-02-27 上海卫星互联网研究院有限公司 Inter-satellite communication method, system and device of low-orbit satellite and electronic equipment
CN117614521B (en) * 2024-01-24 2024-05-10 上海卫星互联网研究院有限公司 Inter-satellite communication method, system and device of low-orbit satellite and electronic equipment
CN118018629A (en) * 2024-04-07 2024-05-10 广州天奕技术股份有限公司 Millimeter wave data stream slicing processing method, device and equipment
CN118018629B (en) * 2024-04-07 2024-05-31 广州天奕技术股份有限公司 Millimeter wave data stream slicing processing method, device and equipment
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