CN113612699B - Method for improving transmission efficiency of IP over CCSDS - Google Patents
Method for improving transmission efficiency of IP over CCSDS Download PDFInfo
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- CN113612699B CN113612699B CN202110883813.XA CN202110883813A CN113612699B CN 113612699 B CN113612699 B CN 113612699B CN 202110883813 A CN202110883813 A CN 202110883813A CN 113612699 B CN113612699 B CN 113612699B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000007787 solid Substances 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 11
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 239000000872 buffer Substances 0.000 claims description 28
- 239000012742 immunoprecipitation (IP) buffer Substances 0.000 claims description 13
- 238000009432 framing Methods 0.000 claims description 9
- 230000002688 persistence Effects 0.000 claims description 2
- 230000002085 persistent effect Effects 0.000 claims 1
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- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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Abstract
The application discloses a method for improving transmission efficiency of IP over CCSDS, comprising the following steps: packaging the satellite network data at a network interface of the IP over CCSDS protocol conversion equipment according to the real-time data and the delay data; integrating network solid storage into IP over CCSDS protocol conversion equipment, and opening up a large-capacity delay IP cache aiming at network delay data increase; the method comprises the steps of performing uniform IP data transmission between network solid storage and high-capacity delay IP cache by using an LVDS interface, and feeding back the current IP cache queuing state in real time by using a special direct communication channel; and the network solid stores the fast and smooth adjustment of the LVDS transmission rate according to the current IP cache queuing state. The method is based on network packetization and high-capacity solid storage integration in the IP over CCSDS protocol conversion equipment, and converts fluctuation and burst transmission of external delay network data into IP uniform transmission of an LVDS interface in the equipment, and combines priority scheduling of an output interface, so that real-time performance of key data transmission is ensured, and IP over CCSDS transmission efficiency is greatly improved.
Description
Technical Field
The application relates to the technical field of IP over CCSDS transmission, in particular to a method for improving the transmission efficiency of the IP over CCSDS.
Background
With the development of the aerospace technology, the complexity of the internal system of the spacecraft and the data transmission rate are continuously improved, and more spacecraft start to adopt the IP technology and the IP network to realize equipment interconnection. In order to realize the space-earth integrated network communication, a protocol conversion device is required to be configured, and based on the IP over CCSDS protocol standard, the IP data is converted into CCSDS protocol data suitable for space-earth link transmission. Therefore, the IP over CCSDS transmission efficiency is critical to the world transmission performance.
The space vehicle is fixed bandwidth to the ground relay or the data transmission link, in order to ensure the synchronism of the link, the effective data is transmitted when the data exists in the transmission process, and the filling frame is transmitted when the data does not exist. Because the IP network data has the characteristics of burst, uncontrollable delay, network jitter and the like, the IP data is not matched with the fixed bandwidth transmission of an heaven-earth link in the downlink, a large number of filling frames are often generated in the transmission process of the IP over CCSDS, and the transmission efficiency is low.
Disclosure of Invention
Aiming at the defects existing in the prior art, the application aims to provide a method for improving the transmission efficiency of the IP over CCSDS, which is based on network packetization and high-capacity solid-state integration in IP over CCSDS protocol conversion equipment, stores external fluctuation and burst transmission delay network data, uniformly transmits IP packets to a high-capacity delay IP cache through an internal LVDS interface of the equipment according to a self-defined protocol, and carries out dynamic rate adjustment according to the real-time queuing state fed back by the high-capacity delay IP cache, so that a later-stage framing cache queue is always in a reasonable range, thereby ensuring the real-time performance of key data transmission and greatly improving the transmission efficiency of the IP over CCSDS.
In order to solve the above problems, the present application provides a method for improving the transmission efficiency of an IP over CCSDS, comprising the following steps:
(1) Packaging the satellite network data at a network interface of the IP over CCSDS protocol conversion equipment according to the real-time data and the delay data;
(2) Integrating network solid storage into IP over CCSDS protocol conversion equipment, and opening up a large-capacity delay IP cache aiming at delay data increase of the network;
(3) The method comprises the steps of performing uniform IP data transmission between network solid storage and a large-capacity delay IP buffer by using an LVDS interface, and feeding back the current delay IP buffer queuing state in real time by using a special direct communication channel;
(4) The network fixedly stores the current delay IP cache queuing state according to the current delay IP cache queuing state, and rapidly and smoothly adjusts LVDS transmission rate;
(5) The priority scheduling module schedules the real-time data and the delay data at the output interface, wherein the priority of the real-time data is higher than that of the delay data.
Further, in the above method, (1) packetizing the on-board network data at the network interface of the IP over CCSDS protocol conversion device according to the real-time data and the delay data, including:
judging a source IP address in an IP packet at a network interface, and packetizing according to real-time data and delay data according to the characteristics and real-time requirements of different network terminal data;
and the real-time data after the packetizing is sent to a small-capacity real-time IP buffer for direct framing output, and the delay data is sent to a network for solid storage.
Further, in the above method, (2) integrating network persistence in an IP over CCSDS protocol conversion device, and opening up a large-capacity delay IP cache for delay data addition of the network, including:
integrating a high-capacity network solid-state memory in the IP over CCSDS protocol conversion equipment, and storing input delay network data according to an IP format; meanwhile, a large-capacity delay IP cache is opened up at the network solid-storage rear end, and the IP data output by the network solid-storage is cached before the IP over CCSDS framing.
Further, in the above method, (3) performing uniform speed IP data transmission between the network solid-storage and the high-capacity delay IP buffer by using an LVDS interface, and feeding back the current delay IP buffer queuing state in real time by using a dedicated direct communication channel, including:
the network solid memory sends the stored IP data to the high-capacity delay IP cache at a constant speed through a special high-speed LVDS interface in the equipment according to a self-defined protocol;
the large-capacity delay IP cache counts the self cache queue state in real time, and transmits the real-time counted cache queue state to the network for solid storage through a direct communication channel special for the inside of the equipment in real time.
Further, in the above method, (4) the network fixedly stores the current delay IP cache queuing state, and quickly and smoothly adjusts the LVDS transmission rate, including:
the network solid memory reads the delay IP cache queuing state in real time through a special direct communication channel, and the network solid memory dynamically adjusts the effective data rate of the output LVDS interface according to a preset strategy or algorithm by combining the current LVDS output rate, so that the data queue in the delay IP cache is always in a reasonable range.
Further, in the above method, (5) the priority scheduling module schedules the real-time data and the delay data at the output interface, including:
the priority scheduling module performs output scheduling according to the scheduling request of the real-time data frame buffer and the delay data frame buffer, and preferentially outputs real-time data; outputting delay data when no real-time data exists; the padding frame is output when neither data is available.
By adopting the technical scheme, the application has the following advantages and positive effects compared with the prior art:
the method integrates network packetization and large-capacity solid storage in the IP over CCSDS protocol conversion equipment, adopts a dynamic rate adjustment strategy based on a real-time cache queuing state, converts fluctuation and burst transmission of external delay network data into IP uniform transmission of an LVDS interface in the equipment, adapts to the characteristic of fixed bandwidth transmission of an world link, combines the priority scheduling of an output interface, not only ensures the real-time performance of key data transmission, but also greatly improves the transmission efficiency of the IP over CCSDS, reduces or even eliminates filling frames in the transmission process, and the transmission efficiency can reach 100 percent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the accompanying drawings:
FIG. 1 is a schematic diagram of a method for improving the transmission efficiency of IPover CCSDS according to an embodiment of the present application;
fig. 2 is a schematic diagram of a custom LVDS interface protocol according to an embodiment of the application.
Detailed Description
The following description will be given of a method for improving transmission efficiency of IP over CCSDS according to the present application with reference to the accompanying drawings, and this embodiment is implemented on the premise of the technical solution of the present application, and a detailed implementation manner and a specific operation procedure are given, but the protection scope of the present application is not limited to the following embodiments, and those skilled in the art can modify and color the present application without changing the spirit and content of the present application.
Referring to fig. 1, a method for improving transmission efficiency of an IP over CCSDS is based on an improved design in an IP over CCSDS protocol conversion device, and includes: (1) Packaging the satellite network data at a network interface of the IP over CCSDS protocol conversion equipment according to the real-time data and the delay data; (2) Integrating network solid storage into IP over CCSDS protocol conversion equipment, and opening up a large-capacity delay IP cache aiming at network delay data increase; (3) The method comprises the steps of performing uniform IP data transmission between network solid storage and a high-capacity delay IP cache by using an LVDS interface, and feeding back the current IP cache queuing state in real time by using the LVDS interface; (4) The network solid stores the speed of LVDS transmission and carries on the fast, smooth adjustment according to the present delay IP buffer and queues the state; (5) The priority scheduling module schedules the real-time data and the delay data at the output interface, wherein the priority of the real-time data is higher than that of the delay data.
In this embodiment, the on-board network data is packetized at the network interface of the IP over CCSDS protocol conversion device according to the real-time data and the delay data. The network data packetization method in this embodiment is as follows: judging a source IP address in an IP packet, according to the characteristics and real-time requirements of different network terminal data, carrying out packet processing on network terminal data such as key telemetry, images, voices and physiology according to real-time data, and carrying out packet processing on network terminal data such as load test and delay telemetry according to delay data; the real-time data after the subpackaging is sent to a small-capacity real-time IP buffer memory for direct framing output, and the delay data is sent to a network for solid storage, converted into uniform LVDS transmission and framing output after high-capacity buffer memory.
In this embodiment, the network solid-storage is integrated in the IP over CCSDS protocol conversion device, and a large-capacity delay IP cache is opened up for increasing the network delay data. The high-capacity network solid-state memory is realized by adopting a NAND FLASH array, is controlled by a main control FPGA, supports a write-while-read working mode, and stores input delay network data according to an IP format; meanwhile, the large-capacity delay IP cache is opened up at the network solid-storage rear end, the large-capacity delay IP cache is realized by adopting an FPGA plug-in DDR memory, when a space exists in the cache, the network solid-storage outputs data through an internal LVDS interface, and the large-capacity delay IP cache caches the IP data which are output by the solid-storage.
In this embodiment, a LVDS interface is used to perform uniform-speed IP data transmission between a network solid-storage and a high-capacity delay IP cache, where the network solid-storage sends stored IP data to the high-capacity delay IP cache at a uniform speed according to a custom protocol through a high-speed LVDS interface dedicated to the device. In this embodiment, a custom LVDS interface protocol is shown in fig. 2. The interface signal comprises 1 path of strobe signal FLAG, 1 path of clock signal CLK and 8 paths of DATA signals DATA transmitted in parallel, the clock falling edge is aligned with DATA jump, the clock rising edge is aligned with the middle of DATA, and when the low level of the strobe signal is effective, the high-capacity delay IP cache collects effective IP DATA through the clock rising edge. Through transmitting a large amount of data stored in the network solid memory through the LVDS interface, the uniformity of the transmission rate is ensured, and the method is suitable for the characteristics of space-earth link relay or fixed bandwidth of data transmission to the ground.
And the large-capacity delay IP cache counts the state of the self cache queue in real time and transmits the state to the network for solid storage through a direct communication channel special for the inside of the equipment in real time. In this embodiment, in order to ensure transmission real-time, the direct connection port adopts 4 paths of direct connection lines, so that 4bit data directly represents the current queue proportion of the buffer, for example, "0001" represents buffer occupation 1/15, "0002" represents buffer occupation 2/15, and so on. The network fixedly stores 4bit data of each clock period and directly reads the direct connection port, so that the current buffer queue state can be immediately obtained, and the instantaneity is greatly improved compared with an external network packet obtaining mode.
In this embodiment, the network solid stores the fast and smooth adjustment of the LVDS transmission rate according to the current delay IP cache queuing stateAnd (3) finishing. A simple rate adjustment strategy whose adjustable parameters include: buffer queue state query interval T, buffer rate adjustment threshold V L VH and VF. In this embodiment, take t=1 ms, vl=1/15 buffer capacity, vh=8/15 buffer capacity, and vf=13/15 buffer capacity. The network is fixedly stored to set an output rate of N gears, the clock CLK frequency at the interface is fixed, the rate adjustment method is to adjust the duty ratio (namely the frame interval) of the FLAG effective signal, the rate is reduced when the effective duty ratio is reduced, the rate is increased when the effective duty ratio is increased, and the maximum rate is set to be slightly higher than the relay or the ground data transmission bandwidth. Inquiring the state of a buffer queue at a fixed network storage time interval of 1ms, and improving the LVDS sending rate when the buffer ratio is smaller than or equal to 1/15 buffer capacity; when the buffer ratio is larger than 1/15 and the buffer capacity is smaller than 8/15, the rate is unchanged; when the buffer ratio is larger than 8/15 buffer capacity, reducing LVDS sending speed; and stopping sending the number when the buffer ratio is larger than 13/15 buffer capacity. Through the rate adjustment, when the real-time network data fluctuates, the queues in the cache can still be ensured to be in a reasonable range.
In this embodiment, two independent IP over CCSDS framing modules are included to frame real-time network data and delay network data respectively, and the frame rate of the frames is greater than the relay or ground data transmission bandwidth by adopting FPGA, and the AOS frames after framing are stored in corresponding frame buffers.
In this embodiment, the priority scheduling module schedules the real-time data and the delay data at the output interface, and when 1 frame of the AOS frame is well organized in the real-time data frame buffer and the delay data frame buffer, generates a scheduling request signal, and the priority scheduling module performs output scheduling according to the scheduling requests of the real-time data frame buffer and the delay data frame buffer. The scheduling policy is: and outputting real-time data in a preferential response mode, outputting delay data in a response mode when the real-time data is not available, and outputting a filling frame when both the real-time data and the delay data are not available.
In this embodiment, through the actual measurement, by using the improved method, under the condition that the network data volume is enough, the transmission efficiency of the downlink relay or the ground data transmission of the IP over CCSDS protocol conversion device reaches 100%, and no filling frame condition occurs.
The above disclosure is only one specific embodiment of the present application, but the present application is not limited thereto, and any changes that can be thought by those skilled in the art should fall within the protection scope of the present application.
Claims (6)
1. A method for improving transmission efficiency of an IP over CCSDS, comprising:
(1) Packaging the satellite network data at a network interface of the IP over CCSDS protocol conversion equipment according to the real-time data and the delay data;
(2) Integrating network solid storage into IP over CCSDS protocol conversion equipment, and opening up a large-capacity delay IP cache aiming at delay data increase of the network;
(3) The method comprises the steps of performing uniform IP data transmission between network solid storage and a large-capacity delay IP buffer by using an LVDS interface, and feeding back the current delay IP buffer queuing state in real time by using a special direct communication channel;
(4) The network fixedly stores the current delay IP cache queuing state according to the current delay IP cache queuing state, and rapidly and smoothly adjusts LVDS transmission rate;
(5) The priority scheduling module schedules the real-time data and the delay data at the output interface, wherein the priority of the real-time data is higher than that of the delay data.
2. The method for improving transmission efficiency of an IP over CCSDS of claim 1, wherein (1) packetizing the on-board network data at the network interface of the IP over CCSDS protocol conversion device according to real-time data and latency data, comprises:
judging a source IP address in an IP packet at a network interface, and packetizing according to real-time data and delay data according to the characteristics and real-time requirements of different network terminal data;
and the real-time data after the packetizing is sent to a small-capacity real-time IP buffer for direct framing output, and the delay data is sent to a network for solid storage.
3. The method for improving transmission efficiency of an IP over CCSDS according to claim 1, wherein (2) integrating network persistence in an IP over CCSDS protocol conversion device and opening up a large capacity delay IP buffer for delay data addition of the network, comprises:
integrating a high-capacity network solid-state memory in the IP over CCSDS protocol conversion equipment, and storing input delay network data according to an IP format; meanwhile, a large-capacity delay IP cache is opened up at the network solid-storage rear end, and the IP data output by the network solid-storage is cached before the IP over CCSDS framing.
4. The method for improving transmission efficiency of an IP over CCSDS according to claim 1, wherein (3) performing uniform speed IP data transmission between a network persistent storage and a high capacity delay IP buffer using an LVDS interface, and feeding back a current delay IP buffer queuing status in real time using a dedicated direct communication channel, comprises:
the network solid memory sends the stored IP data to the high-capacity delay IP cache at a constant speed through a special high-speed LVDS interface in the equipment according to a self-defined protocol;
the large-capacity delay IP cache counts the self cache queue state in real time, and transmits the real-time counted cache queue state to the network for solid storage through a direct communication channel special for the inside of the equipment in real time.
5. The method for improving transmission efficiency of an IP over CCSDS of claim 1, wherein (4) the network stub fast and smoothly adjusts the LVDS transmission rate according to the current delay IP cache queuing state, comprising:
the network solid memory reads the delay IP cache queuing state in real time through a special direct communication channel, and the network solid memory dynamically adjusts the effective data rate of the output LVDS interface according to a preset strategy or algorithm by combining the current LVDS output rate, so that the data queue in the delay IP cache is always in a reasonable range.
6. The method for improving transmission efficiency of an IP over CCSDS of claim 1, wherein (5) the priority scheduling module schedules the real-time data and the delay data at the output interface, comprising:
the priority scheduling module performs output scheduling according to the scheduling request of the real-time data frame buffer and the delay data frame buffer, and preferentially outputs real-time data; outputting delay data when no real-time data exists; the padding frame is output when neither data is available.
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| CN115174874B (en) * | 2022-07-22 | 2023-04-07 | 中国科学院空间应用工程与技术中心 | System, method, medium and equipment for world video interaction based on soft switch |
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