CN116131901A - A satellite data channel control system and method - Google Patents

Abstract

The invention discloses a satellite data channel control system and method, including: a data protocol conversion device, wherein the data protocol conversion device specifically includes: a control interface module, used to generate a control frame, and send it to the broadband through the data channel The data interface unit in the satellite transceiver; the data flow control module is used to control the combined transmission of the control frame and the data frame at the bottom layer of the network; the control frame receiving queue is used to receive and store the directions from the broadband satellite transceiver The control frame and the control frame sending queue are used to store the control frames sent to the broadband satellite transceiver and the data flow control module. The invention improves the speed of dynamic control of the data channel of the satellite transceiver so that it can adapt to the rapidly changing situation of the satellite link and improve the overall data transmission efficiency and reliability.

Description

A satellite data channel control system and method

technical field

The invention relates to the technical field of satellite communication, in particular to a satellite data channel control system and method.

Background technique

In the satellite ground station system, the path for data plane information transmission between the satellite transceiver equipment and the ground network is generally the data channel between the satellite transceiver and the ground network. The equipment in this data channel mainly includes satellite transceivers, Data plane protocol conversion equipment and ground segment network equipment, etc., the data channel realizes the conversion of satellite signals into ground network data, and then transmits them to the ground network element equipment; at the same time, the data from the ground network side is transmitted to the satellite transceiver and converted into satellite data. The air interface data frame is then sent to the satellite.

In the high-orbit satellite communication system, since the position of the satellite is relatively static, the satellite communication link can remain fixed for a long time, and the data channel parameters do not need to be adjusted frequently, and because each satellite resource needs to be allocated to a large number of ground stations, each ground The transmission bandwidth of the station is relatively low, so the control response speed of the data channel is not high. In this type of system, the control method of the data channel is generally realized through the interaction of the upper layer network protocol interface. Communication machines and related network control equipment are equipped with special control entities and control interfaces. Connections between control entities are established through general network transmission protocols such as TCP/UDP/IP to exchange control information. The feedback of control information is via the "bottom-upper-layer- The transmission path of the upper layer, the control signaling is issued through the transmission path of "upper layer to upper layer and then to the bottom layer", each control closed loop needs to carry out multiple sub-processes of interaction between the upper layer of the device and between the upper and lower layers inside the device, information transmission There are many links, and the closed-loop time is longer.

However, in the low-orbit satellite communication system, due to the low orbit position of the satellite, it moves at a high speed relative to the ground station, and the satellite-ground communication link is always in a state of rapid change. Transmission rate and more complex services, the whole system will put forward higher requirements on the real-time performance of the data channel control response.

At present, the control of the data channel between the satellite transceiver and the ground network mostly adopts the method of upper-layer network docking. This method has a large response delay. In the application scenario of low-orbit satellites, the data channel will not be able to respond to changes in the satellite link in time. Adjustments are made, resulting in a decline in transmission efficiency. This method also does not consider the direct transmission of control information with high real-time requirements at the bottom layer of the network through the data plane transmission channel. In addition, this method also needs to configure a dedicated physical interface, which will increase the complexity of the hardware interface in the satellite multi-channel application scenario.

Contents of the invention

The present invention provides a data channel control method and system, mainly aimed at the control of the data channel between the broadband satellite transceiver and the ground network, so as to solve the problem of controlling the response speed of the data channel in the scene of high-speed satellite data transmission, making it Ability to quickly adapt to changes in satellite links.

In order to solve the above technical problems, in the first aspect, the embodiment of the present invention provides a satellite data channel control system, the system includes:

A data protocol conversion device, wherein,

The data protocol conversion equipment specifically includes:

The control interface module is used to generate the control frame and send it to the data interface unit in the broadband satellite transceiver through the data channel;

The data flow control module is used to control the combined transmission of control frames and data frames at the bottom layer of the network;

The control frame receiving queue is used to receive and store control frames from the direction of the broadband satellite transceiver,

The control frame sending queue is used to store the control frames sent to 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 reception information or the user signaling of the upper computer, the uplink control frame mainly includes the control parameters of the data channel, and the control parameters include the sending cycle and the queue capacity , The speed of the network interface is used to adjust the working status of the data channel.

Further, the data flow control module is also used for:

In the uplink transmission channel, according to the current transmission status of the data service data frame, check the current control frame sending window, calculate the time of control frame transmission and the data volume of the data service frame, and write the control frame into the satellite side sending queue; and In the downlink data channel, the transmission frame is received and read from the satellite side, and the frame type information and the unique word information of the control frame are read. If it is a control frame type, the corresponding frame is written into the control frame receiving queue.

Further preferably, the data flow control module controls frame insertion into the service data flow according to a fixed time period, so as to realize combined transmission of control frames and data service data frames at the bottom layer of the network, specifically including:

The first unit used to call the system function to obtain the current system clock count value SCC _cur ;

The second unit for comparing the difference between the count value and the preset processing cycle value to perform the following operations:

When SCC _cur -SCC _prev ≥ SCC _period , use SCC _cur as the starting moment of the next processing cycle, and enter the third unit;

When SCC _cur -SCC _prew <SCC _period , do not operate and end;

Among them, SCC _cur is the count value of the current system clock, which is obtained from the first unit; SCC _prev is the starting moment of the previous processing cycle, which is updated from the fourteenth unit of the previous cycle; SCC _period is the time corresponding to the processing cycle count value;

A third unit for counting the data volume of data service data frames waiting to be sent in the current data plane protocol processing module;

The fourth unit used to calculate the sending window value of the service data frame applied to this processing cycle, the calculation method of the fourth unit is as follows:

in:

W _data is the sending window value of the current cycle business data, in bytes;

R _{sat_link} is the transmission rate of the current satellite link, in bytes/second;

R _{eth_link} is the transmission rate of the current ground network interface, in bytes/second;

T _proc is the data processing cycle value in seconds;

S _data is the total data volume of the current business data to be processed, the unit is byte, and this parameter is obtained from the third unit;

W _adj is the adjustment window value, the unit is byte, and its numerical value depends on the frame transmission situation of the business data plane and the control plane in the previous cycle, and is set in the thirteenth unit of the previous cycle;

The fifth unit for writing business data frames in batches into the sending queue on the satellite side according to the sending window value of the business data frames;

i＝1表示队列的首帧，i＝n为队列最后一帧；It is used to count the total length of the sent control frame, that is, the sixth unit of the current data volume in the sending queue on the satellite side. The unit is byte. The length of the control frame in the queue is recorded as CFL _i , and the subscript i indicates the number of control frames in the queue. sequence number, the total length of the control frame is recorded as

i=1 means the first frame of the queue, i=n is the last frame of the queue;

The seventh unit used to calculate the sending window value of the control frame, the calculation method of the seventh unit is as follows:

in:

W _ctrl is the sending window value of the control frame, the unit is byte;

时，则为队列中所有控制帧执行出列操作，申请帧缓存空间，生成帧指针并写入卫星侧发送队列；for when n>0 and

, execute the dequeue operation for all control frames in the queue, apply for frame buffer space, generate frame pointers and write them into the send queue on the satellite side;

时，先将满足

且

的前k个控制帧执行出列操作的第八单元；when n>0 and

, first satisfy

and

The eighth unit that executes the dequeue operation in the first k control frames;

It is used to judge whether the first frame in the current control frame queue waits for a timeout. If it does not time out, the sending operation of this cycle ends, and it goes to the twelfth unit for execution; if it times out, it goes to the ninth unit for execution in the tenth unit;

If the length of the timeout control frame S _extra sent additionally does not exceed half of the control sending window, then go to the twelfth unit for execution, otherwise go to the tenth unit for execution by the eleventh unit;

It is used to dequeue the current leader control frame, add the frame length to S _extra , and return to the eleventh unit executed by the ninth unit;

In order to perform queue update, all unsent overtime control frames in the queue are discarded, and the waiting time T _wait of all remaining untimed control frames is increased by the twelfth unit of T _proc ;

A thirteenth unit for updating the adjustment window value W _adj of the next period to S _extra ;

The fourteenth unit used to update SCC _prev to SCC _cur .

In the second aspect, in order to solve the technical problems of the embodiments of the present invention, the embodiments of the present invention also provide a satellite data channel channel control method, the method comprising:

S201. The control interface module generates a new uplink control frame according to the received information of the downlink control frame or the user signaling of the upper computer, the uplink control frame includes control parameters of the data channel, and the control parameters include sending cycle, queue capacity, network interface rate to adjust the working status of the data channel;

S202. The control interface module accesses the control frame transmission queue, and if the control frame transmission queue is full, discards the control frame at the head of the queue, rolls back the queue head pointer by one position, and then writes a new control frame to the tail of the queue;

S203. The data flow control module checks the current control frame sending window according to the current transmission status of the data service, and calculates the time when the control frame leaves the queue and the transmitted data traffic volume;

S204. The data flow control module encapsulates the uplink control frame according to the Ethernet frame format, applies for a memory space from the frame buffer management module and stores it, and generates a frame address pointer, and executes the enqueue operation of the sending queue on the satellite side;

S205. The sending queue on the satellite side extracts the control frame corresponding to the frame buffer management module according to the frame address pointer, transmits it to the multi-rate network card in a direct memory access mode, and sends it to the data interface unit of the satellite transceiver.

Further, the S203 specifically includes:

S401. Call the system function to obtain the current system clock count value SCC _cur ;

S402. Comparing the difference between the count value and the preset processing cycle value, perform the following operations:

When SCC _cur -SCC _prev ≥ SCC _period , use SCC _cur as the starting moment of the next processing cycle, and enter S403;

When SCC _cur -SCC _prev <SCC _period , do not operate and end;

Wherein, SCC _cur is the count value of the current system clock, obtained in S401; SCC _prev is the starting moment of the previous processing cycle, updated in S414 of the previous cycle; SCC _period is the count value corresponding to the processing cycle time;

S403. Count the number of data frames of service data waiting to be sent in the current data plane protocol processing module;

S404. Calculate the sending window value of the service data frame applied to this processing cycle, and the calculation method is as follows:

in:

W _data is the sending window value of the current cycle business data, in bytes;

R _{sat_link} is the transmission rate of the current satellite link, in bytes/second;

R _{eth_link} is the transmission rate of the current ground network interface, the unit is byte/s, if Gigabit Ethernet interface is used, this parameter is 125M bytes/s;

T _proc is the data processing cycle value in seconds;

S _data is the total data frame size of the current pending business data, in bytes, and this parameter is obtained from S403;

W _adj is the adjustment window value, the unit is byte, and its numerical value depends on the frame transmission situation of the business data plane and the control plane in the previous cycle, and is set in S413 of the previous cycle;

S405. Write the service data frames into the sending queue on the satellite side in batches according to the service data frame sending window value;

i＝1表示队列的首帧，i＝n为队列最后一帧；S406, counting the total length of the control frame sent, that is, the current amount of data in the sending queue, the unit is byte, the length of the control frame in the queue is recorded as CFL _i , and the subscript i represents the serial number of the control frame in the queue, then the total number of control frames The length is recorded as

i=1 means the first frame of the queue, i=n is the last frame of the queue;

S407. Calculate the sending window value of the control frame, the calculation method is as follows:

in:

W _ctrl is the sending window value of the control frame, the unit is byte;

时，则为队列中所有控制帧执行出列操作，申请帧缓存空间，生成帧指针并写入卫星侧发送队列；S408, when n>0 and

, execute the dequeue operation for all control frames in the queue, apply for frame buffer space, generate frame pointers and write them into the send queue on the satellite side;

时，先将满足

且

的前k个控制帧执行出列操作，when n>0 and

, first satisfy

and

The first k control frames of the dequeue operation are performed,

S409, judging whether the first frame of the team in the current control frame queue waits for timeout, if not overtime, then this cycle sending operation ends, and forwards to S412; if overtime, then forwards to S410,

S410. If the length S _extra of the timeout control frame sent additionally does not exceed half of the control sending window, then go to S412, otherwise go to S411;

S411. Dequeue the current leader control frame, add the frame length to S _extra , and return to S409;

S412. Perform queue update, discard all unsent overtime control frames in the queue, and increase the waiting time T _wait of all remaining untimed control frames by T _proc ;

S413, and then update the adjustment window value W _adj of the next period to S _extra ;

S414. Update SCC _prev to SCC _cur .

Further, the method also includes:

S301, the data interface unit of the satellite transceiver writes the current satellite link working state parameters into the information field of the control frame, the working state parameters include modulation and coding mode, signal bandwidth, channel number, and fill the frame header information to generate downlink control The frame is sent to the data protocol conversion device;

S302. The data protocol conversion device receives the control frame through the multi-rate network card, and stores it in the 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 address pointer into the receiving queue at the satellite side;

S304. The data flow control module reads the data frame from the receiving queue on the satellite side, reads the frame type information and the unique word information of the control frame, and if it is 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 by polling, reads field information such as the address, type, unique word and length of the frame, compares it with the preset parameter table to determine the correctness of the received control frame, Read the satellite link parameters in the information field and save them to the local parameter list.

Through the above technical scheme conceived by the present invention, compared with the prior art, the embodiment of the present invention has the following advantages: improve the speed of dynamic control of the data channel of the satellite transceiver, so that it can adapt to the rapidly changing situation of the satellite link , so as to improve the overall data transmission efficiency and reliability. At the same time, since the control information is directly transmitted in the data channel, there is no need to add a dedicated high-speed control interface, which further reduces the complexity of the hardware interface.

Description of drawings

The specific implementation manners of the present invention will be illustrated below 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;

2 is a schematic flow chart of a satellite data channel control method according to an embodiment of the present invention;

3 is a flow chart 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 present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the scope of the present invention.

A control method for the data path between the broadband satellite transceiver and the ground network proposed by the embodiment of the present invention inserts the control frame between the satellite transceiver and the upper-layer network equipment into the data acceleration channel, and communicates with the business The data is combined and transmitted to realize the rapid adjustment of the working parameters of each device on the data path, so that the upper-layer network devices can respond quickly according to the changes in the satellite link.

In order to achieve the purpose of the present invention, the embodiment of the present invention provides a satellite data channel control system, the system includes:

A data protocol conversion device, wherein,

The data protocol conversion equipment specifically includes:

The control interface module is used to generate the control frame and send it to the data interface unit in the broadband satellite transceiver through the data channel;

The data flow control module is used to control the combined transmission of control frames and data frames at the bottom layer of the network;

The control frame receiving queue is used to receive and store control frames from the direction of the broadband satellite transceiver,

The control frame sending queue is used to store the control frames sent to 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 reception information or the user signaling of the upper computer, the uplink control frame mainly includes the control parameters of the data channel, and the control parameters include the sending cycle and the queue capacity , The speed of the network interface is used to adjust the working status of the data channel.

Further, the data flow control module is also used for:

In the uplink transmission channel, according to the current transmission status of the data service data frame, check the current control frame sending window, calculate the time of control frame transmission and the data volume of the data service frame, and write the control frame into the satellite side sending queue; and In the downlink data channel, the transmission frame is received and read from the satellite side, and the frame type information and the unique word information of the control frame are read. If it is a control frame type, the corresponding frame is written into the control frame receiving queue.

Further preferably, the data flow control module controls frame insertion into the service data flow according to a fixed time period, so as to realize combined transmission of control frames and data service data frames at the bottom layer of the network, specifically including:

The first unit used to call the system function to obtain the current system clock count value SCC _cur ;

The second unit for comparing the difference between the count value and the preset processing cycle value to perform the following operations:

When SCC _cur -SCC _prev ≥ SCC _period , use SCC _cur as the starting moment of the next processing cycle, and enter the third unit for execution;

When SCC _cur -SCC _prev <SCC _period , do not operate and end;

Among them, SCC _cur is the count value of the current system clock, which is obtained from the first unit; SCC _prev is the starting moment of the previous processing cycle, which is updated from the fourteenth unit of the previous cycle; SCC _period is the time corresponding to the processing cycle count value;

A third unit for counting the data volume of data service data frames waiting to be sent in the current data plane protocol processing module;

The fourth unit used to calculate the sending window value of the service data frame applied to this processing cycle, the calculation method of the fourth unit is as follows:

in:

W _data is the sending window value of the current cycle business data, in bytes;

R _{sat_link} is the transmission rate of the current satellite link, in bytes/second;

R _{eth_link} is the transmission rate of the current ground network interface, in bytes/second;

T _proc is the data processing cycle value in seconds;

S _data is the total data volume of the current business data to be processed, the unit is byte, and this parameter is obtained from the third unit;

W _adj is the adjustment window value, the unit is byte, and its numerical value depends on the frame transmission situation of the business data plane and the control plane in the previous cycle, and is set in the thirteenth unit of the previous cycle;

The fifth unit for writing business data frames in batches into the sending queue on the satellite side according to the sending window value of the business data frames;

i＝1表示队列的首帧，i＝n为队列最后一帧；It is used to count the total length of the sent control frame, that is, the sixth unit of the current data volume in the sending queue on the satellite side. The unit is byte. The length of the control frame in the queue is recorded as CFL _i , and the subscript i indicates the number of control frames in the queue. sequence number, the total length of the control frame is recorded as

i=1 means the first frame of the queue, i=n is the last frame of the queue;

The seventh unit used to calculate the sending window value of the control frame, the calculation method of the seventh unit is as follows:

in:

W _ctrI is the sending window value of the control frame, in bytes;

时，则为队列中所有控制帧执行出列操作，申请帧缓存空间，生成帧指针并写入卫星侧发送队列；for when n>0 and

, execute the dequeue operation for all control frames in the queue, apply for frame buffer space, generate frame pointers and write them into the send queue on the satellite side;

时，先将满足

且

的前k个控制帧执行出列操作的第八单元；when n>0 and

, first satisfy

and

The eighth unit that executes the dequeue operation in the first k control frames;

It is used to judge whether the first frame in the current control frame queue waits for a timeout. If it does not time out, the sending operation of this cycle ends, and it goes to the twelfth unit for execution; if it times out, it goes to the ninth unit for execution in the tenth unit;

If the length of the timeout control frame S _extra sent additionally does not exceed half of the control sending window, then go to the twelfth unit for execution, otherwise go to the tenth unit for execution by the eleventh unit;

It is used to dequeue the current leader control frame, add the frame length to S _extra , and return to the eleventh unit executed by the ninth unit;

In order to perform queue update, all unsent overtime control frames in the queue are discarded, and the waiting time T _wait of all remaining untimed control frames is increased by the twelfth unit of T _proc ;

A thirteenth unit for updating the adjustment window value W _adj of the next period to S _extra ;

The fourteenth unit used to update SCC _prev to SCC _cur .

Here, in order to facilitate the understanding of the control method of satellite data channel transmission in the embodiment of the present invention, as shown in Figure 1, the relevant business modules in the entire satellite data channel are introduced as follows:

Broadband satellite transceiver 101, as a communication device interacting with satellites in the space segment, receives data frames from ground network equipment on the one hand, performs digital processing processes such as frame splitting, grouping of baseband frames, encoding, and modulation, and then converts them into satellite transmission data frames , sent to the space segment satellite; on the other hand, it receives the data frame from the space segment satellite, performs digital processing such as demodulation, decoding, decoding baseband frame, and framing, and converts it into a network data frame, and sends it to the ground network equipment;

The broadband satellite transceiver 101 includes:

The digital baseband processing unit 102 completes the digital baseband processing process of satellite uplink and downlink signals, including processes such as modulation and demodulation, encoding and decoding, clock and carrier synchronization;

The data interface unit 103 completes the conversion process between the network equipment data frame and the satellite baseband data frame;

The data protocol conversion device 201 is an intermediate conversion device of the data channel, and is a front-end network device of the broadband satellite transceiver on the ground network side, and is used to complete the data plane protocol conversion between the ground network and the satellite network, and at the same time convert the data channel to control;

The data protocol conversion device 201 specifically includes:

The control interface module 203 is used to analyze the information fed back by the broadband satellite transceiver 101, generate a control frame and send it to the data interface unit 103 in the broadband satellite transceiver 101 through the data channel, and control and adjust the underlying parameters of the respective networks , to adapt to changes in the link, and maintain the control interface with the host computer at the same time: on the one hand, feed back the information of the data path to the host computer for user interface presentation; on the other hand, receive the control strategy parameters of the data path, and update the local control parameter set;

The data flow control module 206 realizes the combined transmission of the two data streams of the control plane and the data plane at the bottom layer of the network, and realizes the dual stream combining process through the method of multi-queue round robin scheduling;

The control frame receiving queue 204 receives and stores the control frame from the direction of the broadband satellite transceiver 101, the data flow control module 206 controls its write operation and some parameter adjustment, and the control interface module 203 controls its read operation;

The control frame transmission queue 205 stores the control frames sent to the broadband satellite transceiver 101 and the data flow control module 206, the data flow control module 206 controls its read operation and part parameter adjustment, and the control interface module 203 controls its write operation;

The data plane protocol processing module 207, in the uplink direction, converts the service data flow from the ground network format to the satellite network format, and performs the opposite conversion in the downlink direction;

The frame buffer management module 202 is used to manage the physical storage area of the Ethernet data frame, and provides the address space of the Ethernet data frame entity to the frame management module 213, the data flow control module 206 and the data plane protocol processing module 207;

The receiving queue 208 on the satellite side completes the queuing storage of the Ethernet data frames from the broadband satellite transceiver 101 and provides an application layer access interface;

The sending queue 209 on the satellite side completes the queuing storage of Ethernet data frames sent from the application layer and broadband to the satellite transceiver 101, and provides an application layer access interface;

The receiving queue 210 on the ground network side completes the queue storage of the Ethernet data frames from the ground network equipment;

The sending queue 211 on the ground network side completes the queue storage of the Ethernet data frames sent from the application layer to the ground network equipment;

The multi-rate network card 212 completes the processing of the physical layer and the data link layer of the Ethernet interface;

The frame management module 213 completes frame descriptor generation, frame data buffering, frame header parsing, frame classification, and entry of the satellite side receiving queue on the receiving channel; completes the satellite side sending queue on the sending channel. Queue, frame checksum and send to multi-rate NIC;

The upper computer 301 runs the user-side control program of the broadband satellite transceiver 101, and is used to receive user instructions to generate satellite transceiver control information and process corresponding feedback information;

The ground network switch 401, located in the ground station of the satellite communication system, is used to connect the ground network equipment and the satellite equipment, 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 present invention uses the method of combined transmission of the control frame and business data at the bottom layer of the network data acceleration channel, and dynamically adjusts the time and the amount of inserted data of the control plane information , so that the control plane information insertion operation is "insensitive" to the data plane transmission. At the same time, when the high-speed business data appears instantaneously high-speed, appropriate avoidance is performed so that the control plane information can be transmitted normally.

The working process given by the embodiment of the present invention includes the direction of the uplink channel, which is sent from the data protocol conversion device to the satellite transceiver, and the direction of the downlink channel, which is sent from the satellite transceiver to the satellite transceiver. Data protocol conversion equipment.

Among them, the workflow in the direction of the uplink channel is shown in Figure 2:

S201. The control interface module generates a new uplink control frame according to the received information of the downlink control frame or the user signaling of the upper computer. The uplink control frame mainly includes control parameters of the data channel, and the control parameters include sending cycle, queue capacity, network interface rate, etc., to adjust the working status of each sub-module of the data channel;

On the one hand, new control parameters are generated according to the changes in satellite link parameters such as satellite channel bandwidth and modulation and coding mode in the downlink control frame, and the uplink control frame is generated; on the other hand, after receiving the user signaling packet from the host computer, read The corresponding control parameters are used to generate an uplink control frame. The format of the control frame is as follows:

Destination 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)

Among them, the length of the target address is 6 bytes, and the filling content can be the MAC address of the data network port of the target device;

The length of the source address is 6 bytes, and the filling content can be the MAC address of the data network port of the source device;

The frame type length is 2 bytes, and the filling content is 0x8A, 0x01;

Control frame unique word: the length is 4 bytes, and the filling content is 0xA3, 0xB5, 0xC5, 0xAD;

Frame length: the length is 2 bytes, the unit is byte, and identifies the length of the control information frame;

Control information: the length is variable, ranging from 40 to 1024 bytes. The uplink channel is filled with the control parameters of each submodule on the data channel, and the downlink channel is filled with satellite link parameters and status information of each submodule of the data channel.

The above is only an example of the control frame, and its format can be adjusted according to actual implementation needs.

S202, the control interface module accesses the control frame transmission queue, if the control frame transmission queue is full, discards the control frame at the head of the queue, rolls back the queue head pointer by one position, and then writes the new control frame into the tail of the queue;

S203. The data flow control module checks the current control frame sending window according to the current transmission status of the data plane service, and calculates the time when the control frame is out of the queue and the amount of data;

S204. The data flow control module encapsulates the uplink control frame according to the Ethernet frame format, applies for a memory space from the frame buffer management module and stores it, and generates a frame address pointer, and executes the enqueue operation of the sending queue on the satellite side;

S205. The sending queue on the satellite side extracts the control frame corresponding to the frame buffer management module according to the frame address pointer, transmits it to the multi-rate network card in a direct memory access mode, and sends it to the data interface unit of the satellite transceiver.

For the workflow in the direction of the downlink channel, as shown in Figure 3:

S301, the data interface unit of the satellite transceiver writes the current satellite link working state parameters, such as modulation and coding mode, signal bandwidth, channel number and other parameters into the information field of the control frame, and fills the frame header information such as address and length to generate downlink The control frame is sent to the data protocol conversion device;

S302. The data protocol conversion device receives the control frame through the multi-rate network card, and stores it in the 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 it into the receiving queue at the satellite side;

S304. The data flow control module reads the data frame from the receiving queue on the satellite side, reads the frame type information and the unique word information of the control frame, and if it is 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 by polling, reads field information such as the address, type, unique word and length of the frame, compares it with the preset parameter table to determine the correctness of the received control frame, Read the satellite link parameters in the information field and save them to the local parameter list.

The data flow control module is used to control the combined transmission process of the two data streams of the control plane and the data plane at the bottom of the network, and dynamically adjust the amount of inserted control information by monitoring the instantaneous change of the data stream sent to the satellite side : Process the process of inserting the control frame into the service data flow according to a fixed time period. In each processing period, first process the service data forwarding in the data protocol conversion module, and then forward the control frame. The workflow is shown in Figure 4:

S401. Call the system function to obtain the current system clock count value SCC _cur ;

S402. Comparing the difference between the count value and the preset processing cycle value, perform the following operations:

When SCC _cur -SCC _prev ≥ SCC _period , use SCC _cur as the starting moment of the next processing cycle, and enter S403;

When SCC _cur -SCC _prev <SCC _period , do not operate and end;

Wherein, SCC _cur is the count value of the current system clock, obtained in S401; SCC _prev is the starting moment of the previous processing cycle, updated in S414 of the previous cycle; SCC _period is the count value corresponding to the processing cycle time;

S403. Count the data volume of service data frames waiting to be sent in the current data plane protocol processing module;

S404. Calculate the sending window value of the service data frame applied to this processing cycle, and the calculation method is as follows:

in:

W _data is the sending window value of the current cycle business data, in bytes;

R _{sat_link} is the transmission rate of the current satellite link, in bytes/second;

R _{eth_link} is the transmission rate of the current ground network interface, the unit is byte/s, if Gigabit Ethernet interface is used, this parameter is 125M bytes/s;

T _proc is the data processing cycle value in seconds;

S _data is the total data volume of the current business data to be processed, the unit is byte, and this parameter is obtained from S403;

W _adj is the adjustment window value, the unit is byte, and its numerical value depends on the frame transmission situation of the business data plane and the control plane in the previous cycle, and is set in S413 of the previous cycle;

S405. Write the service data frames into the sending queue on the satellite side in batches according to the service data frame sending window value;

i＝1表示队列的首帧，i＝n为队列最后一帧；S406, counting the total length of the control frame sent, that is, the current amount of data in the sending queue, the unit is byte, the length of the control frame in the queue is recorded as CFL _i , and the subscript i represents the serial number of the control frame in the queue, then the total number of control frames The length is recorded as

i=1 means the first frame of the queue, i=n is the last frame of the queue;

S407. Calculate the sending window value of the control frame, the calculation method is as follows:

in:

W _ctrl is the sending window value of the control frame, the unit is byte;

时，则为队列中所有控制帧执行出列操作，申请帧缓存空间，生成帧指针并写入卫星侧发送队列；S408, when n>0 and

, execute the dequeue operation for all control frames in the queue, apply for frame buffer space, generate frame pointers and write them into the send queue on the satellite side;

时，先将满足

且

的前k个控制帧执行出列操作，when n>0 and

, first satisfy

and

The first k control frames of the dequeue operation are performed,

S409, judging whether the first frame of the team in the current control frame queue waits for timeout, if not overtime, then this cycle sending operation ends, and forwards to S412; if overtime, then forwards to S410,

S410. If the length S _extra of the timeout control frame sent additionally does not exceed half of the control sending window, then go to S412, otherwise go to S411;

S411. Dequeue the current leader control frame, add the frame length to S _extra , and return to S409;

S412. Perform queue update, discard all unsent overtime control frames in the queue, and increase the waiting time T _wait of all remaining untimed control frames by T _proc ;

S413, and then update the adjustment window value W _adj of the next period to S _extra ;

S414. Update SCC _prev to SCC _cur .

Through the above technical scheme conceived by the present invention, compared with the prior art, the embodiment of the present invention has the following advantages: improve the speed of dynamic control of the data channel of the satellite transceiver, so that it can adapt to the rapidly changing situation of the satellite link , so as to improve the overall data transmission efficiency and reliability. At the same time, since the control information is directly transmitted in the data channel, there is no need to add a dedicated high-speed control interface, which further reduces the complexity of the hardware interface.

This embodiment is only an exemplary description of this patent, and does not limit its protection scope. Those skilled in the art can also make partial changes to it, as long as it does not exceed the spirit and essence of this patent, all within the protection scope of this patent.

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:

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

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:

wherein:

W _ctrl a sending window value of a control frame is in bytes;

to when n>0 and 0

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

When it is, it will satisfy->

And->

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:

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

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:

wherein:

W _ctrl a sending window value of a control frame is in bytes;

s408, when n>0 and 0

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

When it is, it will satisfy->

And->

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.

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