CN115801714B - A method for processing low resource consumption satellite-to-ground frame disassembly and assembly on-board a forwarding satellite communication - Google Patents
A method for processing low resource consumption satellite-to-ground frame disassembly and assembly on-board a forwarding satellite communication Download PDFInfo
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- CN115801714B CN115801714B CN202211508105.9A CN202211508105A CN115801714B CN 115801714 B CN115801714 B CN 115801714B CN 202211508105 A CN202211508105 A CN 202211508105A CN 115801714 B CN115801714 B CN 115801714B
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- 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
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Abstract
The invention belongs to the technical field of satellite communication and relates to a satellite-ground frame disassembling and assembling method with low resource consumption on a processing and forwarding satellite communication, which comprises the steps that (1) a ground terminal at a transmitting side disassembles a link layer frame according to the burst length of a physical channel, the frame type, the priority and allocated time slot resources, and adds a link layer frame header to be filled in the burst in sequence, (2) a satellite recognizes a management and control frame according to the frame type in the link layer frame header, and forwards a service frame, (3) a receiving side terminal reassembles the received link layer frame according to a disassembly identifier, a source address and the priority. The invention splits the link layer frame for adapting the burst length of the physical layer, effectively reduces the burst idle space and obviously improves the link transmission efficiency, and simultaneously adopts an end-to-end processing mode for the service frame, so that the ground splitting and recombination are adopted, satellite participation is not needed, the processing complexity on the satellite is greatly reduced, and the invention is suitable for processing a satellite communication system on the satellite.
Description
Technical Field
The invention relates to a link layer frame disassembly and assembly technology in the technical field of satellite communication, which is particularly suitable for an on-board processing and forwarding satellite communication system.
Background
The frame disassembly and assembly technology is an indispensable work of a link layer of a satellite communication system, and especially for continuous long-frame service, the frame disassembly and assembly technology needs to be used for re-framing transmission according to a frame structure conforming to the link layer. Currently, in many cases, a transparent transponder-based satellite communication system is usually used to split frames end-to-end, that is, between two satellite communication earth stations reachable by a single-hop satellite. The common splitting and reassembling modes are two, namely, frame splitting at the network layer and frame splitting at the physical layer. The network layer disassembling and assembling frame is to organize the link layer frame according to the burst length in the network layer, the bandwidth utilization rate is low, the problem that the burst length change caused by the link change can not be adapted exists, the physical layer disassembling and assembling frame is to disassemble and assemble the link layer frame in the physical layer (modem), the modulator is to disassemble and assemble the link layer frame, the demodulator is to reassemble the link layer frame, when the method is used for an on-board processing and forwarding system, the satellite needs to reassemble all the disassembled link layer frames, and the problems of complex on-board processing and high resource consumption exist.
Disclosure of Invention
The technical problem to be solved by the invention is to avoid the defects in the background technology, and provide a star-ground integrated link layer frame disassembling and assembling method. The invention adopts an end-to-end frame disassembling and assembling mode, the disassembly and the reassembly are carried out at a ground terminal, the unpacking is carried out at a ground transmitting end link layer, the reassembling is carried out at a ground receiving end link layer, and the air interface transmission is a complete link layer frame.
The invention adopts the technical scheme that:
a method for processing and forwarding satellite communication on-satellite low-resource consumption satellite-ground frame disassembly comprises the following steps:
(1) The method comprises the steps that a transmitting side ground terminal splits a link layer frame, when splitting is performed, the number of bursts to be filled and the length of each burst are calculated according to allocated time slot resources, the link layer frame to be transmitted is filled into the bursts, if the length of the link layer frame is larger than the residual length of the bursts during filling, the link layer frame is intercepted according to the residual length of the bursts, splitting identification in a link layer frame header is modified, and the frame header of the link layer frame is copied to the front of the residual link layer frame, wherein the link layer frame header comprises splitting identification, priority identification, source address, destination address and frame type information;
(2) The satellite-borne demodulator receives a burst sent by a ground terminal, extracts a link layer frame from the burst, sends the link layer frame to the satellite-borne exchanger, classifies the link layer frame according to the frame type in a link layer frame header, judges whether recombination is needed according to a splitting identification in the link layer frame header if the link layer frame is a management frame, directly sends the link layer frame to a satellite-borne network controller for processing if the link layer frame is a complete link layer frame, and sends the link layer frame to the satellite-borne network controller for processing after the link layer frame is recombined according to a source address, a priority identification and the splitting identification in the link layer frame header if the link layer frame is a service frame;
(3) The receiving side ground terminal receives the satellite downlink data, analyzes the link layer frame, judges whether the link layer frame is split according to the splitting identification in the link layer frame header, directly processes the link layer frame if the link layer frame is complete, and reorganizes the link layer frame according to the source address, the priority identification and the splitting identification in the link layer frame header if the link layer frame is incomplete.
Further, in step (1), when the link layer frame is filled into bursts, the high priority link layer frame is filled first.
Further, in step (1), the link layer frames with the same priority are required to be filled completely with the previous link layer frame, and then the next link layer frame is filled.
Further, in step (1), the split identifier may identify the corresponding link layer frame as a complete frame, a first segment, a middle segment, and a tail end.
Further, in step (1), when the destination address of the link layer frame is a satellite, the frame type is defined as a management frame, the management frame is defined as the highest priority, and the priority is filled, and at the same time, the management frame of authentication, network entry and exit signaling and resource application class is smaller than a minimum burst length.
Further, in step (2), the on-board switch reorganizes according to the source address, the priority identifier and the splitting identifier in the link layer frame header, and the specific processing procedure is as follows:
The space-borne exchanger carries out classification processing according to the splitting identification, if the splitting identification is a first segment, the local buffer memory is applied according to the source address and the priority identification in the frame header, if the splitting identification is a middle segment or a tail end, the payload of the link layer frame is stored in the applied local buffer memory in sequence according to the source address and the priority identification in the frame header, and meanwhile, after the tail end is received, the link layer frame is read from the buffer memory to carry out recombination processing, and the applied buffer memory is released.
Further, in step (3), after receiving the link layer frame, the receiving side ground terminal first analyzes the destination address in the link layer frame header, and if the destination address is not the terminal, it is discarded.
Further, in the step (3), reorganization is performed according to the source address, the priority identifier and the splitting identifier in the frame header of the link layer, and the specific processing procedure is as follows:
and classifying according to the splitting identification, applying for local buffering according to the source address and the priority identification in the frame header if the splitting identification is the first segment, storing the payload of the link layer frame in the applied local buffering according to the source address and the priority identification in the frame header if the splitting identification is the middle segment or the tail end, simultaneously reading the link layer frame from the buffering for reorganization after receiving the tail end, and releasing the applied buffering.
Further, the method is characterized in that when the ground terminal receives the link layer frame splitting identification as the first segment, whether the local buffer is applied is searched according to the source address and the priority in the frame header, if the local buffer is applied, the applied buffer is released, and the buffer application is carried out again.
Compared with the background technology, the invention has the following advantages:
1) The method and the device for splitting and reorganizing the link layer frames are carried out on the ground terminal, special processing of the link layer frames by satellite-borne equipment is not needed, and the satellite processing complexity is low;
2) When the link layer frame splitting is carried out, the invention supports the high-priority link layer frame to interrupt the transmission of the low-priority link layer frame and supports the comprehensive service transmission based on priority;
3) The invention can fill the next link layer frame when the burst residual length is larger than the link layer frame head, and has higher transmission efficiency;
4) The invention breaks up and reorganizes the link layer frame in the link layer, the interface between the layers is clear, the link layer and the physical layer are complete link layer frames, the air interface transmission data is complete link layer frames;
5) The invention has the advantages of clear interlayer interface and support of comprehensive service transmission based on priority, and has the advantage of simple on-board processing when being used for an on-board processing forwarding system.
Drawings
Fig. 1 is a schematic diagram of link layer framing method of the present invention.
Fig. 2 is a schematic diagram of a link layer header according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the ground terminal 1 is a transmitting-side ground terminal, the ground terminal 2 is a receiving-side ground terminal, and the on-board processing load includes a satellite demodulator, a satellite exchanger, a satellite modulator, and a satellite network controller.
A method for processing and forwarding satellite communication on-satellite low-resource consumption satellite-ground frame disassembly comprises the following specific steps:
(1) The ground terminal splits the link layer frames, when splitting, the ground terminal at the transmitting side calculates the burst quantity and each burst length to be filled according to the allocated time slot resources, fills the link layer frames to be transmitted into the bursts, intercepts the link layer frames according to the burst residual length if the link layer frame length is greater than the burst residual length during filling, modifies the splitting identification in the link layer frame header, and copies the frame header of the link layer frames to the front of the residual link layer frames, thereby ensuring that the filling in the bursts is complete link layer frames.
As shown in FIG. 2, the link layer frame header includes a split identifier, a priority identifier, a source address, a destination address, and frame type information, where the split identifier may identify that the corresponding link layer frame is a complete frame, a first segment, a middle segment, and a tail segment.
Furthermore, when the link layer frames are filled into bursts, the high-priority link layer frames are filled preferentially, and the next link layer frame can be filled after the link layer frames with the same priority are filled completely.
Furthermore, when the destination address of the link layer frame is a satellite, the frame type is defined as a management and control frame, the management and control frame is defined as the highest priority, the priority is filled, the frame length of the management and control frame is strictly controlled, the management and control frames such as authentication, network entry and exit signaling, resource application and the like need to be smaller than a minimum burst length, the management and control frames do not need to be split, and the splitting mode of the variable-length management and control frames such as a routing table and the like is the same as that of the service frame.
(2) The satellite classification carries out different frame disassembly and assembly processes, namely, a satellite-borne demodulator receives a burst sent by a ground terminal, extracts a link layer frame from the burst, sends the burst to a satellite-borne exchange, the satellite-borne exchanger carries out classification and treatment according to the frame type in a link layer frame header, judges whether the link layer frame needs to be recombined according to a disassembly mark in the link layer frame header if the link layer frame is a management frame, directly sends the link layer frame to a satellite-borne network control for treatment if the link layer frame is a complete link layer frame, and carries out recombination according to a source address, a priority mark and the disassembly mark in the link layer frame header if the link layer frame is a non-complete link layer frame;
wherein, reorganizing is carried out according to the source address, the priority identification and the splitting identification in the frame header of the link layer, the specific treatment process comprises the following steps:
and classifying according to the splitting identification, applying for local buffering according to the source address and the priority identification in the frame header if the splitting identification is the first segment, storing the payload of the link layer frame in the applied local buffering according to the source address and the priority identification in the frame header if the splitting identification is the middle segment or the tail end, simultaneously reading the link layer frame from the buffering for reorganization after receiving the tail end, and releasing the applied buffering.
(3) The ground terminal reorganizes the link layer data, namely, the ground terminal receives the satellite downlink data, firstly analyzes the destination address in the link layer frame header, discards the link layer frame if the destination address is not the terminal, analyzes the link layer frame from the destination address if the destination address is the terminal, judges whether the frame is split according to the splitting identification in the link layer frame header, directly processes the link layer frame if the link layer frame is complete, reorganizes the link layer frame according to the source address, the priority identification and the splitting identification in the link layer frame header if the link layer frame is incomplete, and processes the link layer frame after reorganization.
Wherein, reorganizing is carried out according to the source address, the priority identification and the splitting identification in the frame header of the link layer, the specific treatment process comprises the following steps:
and classifying according to the splitting identification, applying for local buffering according to the source address and the priority identification in the frame header if the splitting identification is the first segment, storing the payload of the link layer frame in the applied local buffering according to the source address and the priority identification in the frame header if the splitting identification is the middle segment or the tail end, simultaneously reading the link layer frame from the buffering for reorganization after receiving the tail end, and releasing the applied buffering.
Further, when the ground terminal receives the link layer frame splitting identification as the first segment, searching whether the local buffer is applied according to the source address and the priority in the frame header, if so, releasing the applied buffer, and re-applying the buffer, thereby preventing buffer leakage caused by the loss of the tail end of the last split link layer frame.
It should be noted that the foregoing is only a preferred embodiment of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions of the foregoing embodiments, or equivalents may be substituted for other technical features thereof, and any modifications, equivalents, improvements or changes thereof may be made without departing from the spirit and principle of the present invention.
Claims (9)
1. A method for processing and forwarding satellite communication on-satellite low-resource consumption satellite-ground frame disassembly is characterized by comprising the following steps:
(1) The method comprises the steps that a transmitting side ground terminal splits a link layer frame, when splitting is performed, the number of bursts to be filled and the length of each burst are calculated according to allocated time slot resources, the link layer frame to be transmitted is filled into the bursts, if the length of the link layer frame is larger than the residual length of the bursts during filling, the link layer frame is intercepted according to the residual length of the bursts, splitting identification in a link layer frame header is modified, and the frame header of the link layer frame is copied to the front of the residual link layer frame, wherein the link layer frame header comprises splitting identification, priority identification, source address, destination address and frame type information;
(2) The satellite-borne demodulator receives a burst sent by a ground terminal, extracts a link layer frame from the burst, sends the link layer frame to the satellite-borne exchanger, classifies the link layer frame according to the frame type in a link layer frame header, judges whether recombination is needed according to a splitting identification in the link layer frame header if the link layer frame is a management frame, directly sends the link layer frame to a satellite-borne network controller for processing if the link layer frame is a complete link layer frame, and sends the link layer frame to the satellite-borne network controller for processing after the link layer frame is recombined according to a source address, a priority identification and the splitting identification in the link layer frame header if the link layer frame is a service frame;
(3) The receiving side ground terminal receives the satellite downlink data, analyzes the link layer frame, judges whether the link layer frame is split according to the splitting identification in the link layer frame header, directly processes the link layer frame if the link layer frame is complete, and reorganizes the link layer frame according to the source address, the priority identification and the splitting identification in the link layer frame header if the link layer frame is incomplete.
2. The method for processing and forwarding low-resource-consumption on-board satellite-to-ground de-framing of a satellite communication of claim 1, wherein in step (1), high-priority link layer frames are preferentially padded when link layer frame-to-burst padding is performed.
3. The method for processing and forwarding satellite communication on-board low-resource-consumption satellite-ground frame disassembly as claimed in claim 1, wherein in the step (1), the link layer frames with the same priority are required to be filled after the previous link layer frame is completely filled, and then the next link layer frame is filled.
4. The method for processing and forwarding low-resource-consumption star-to-ground de-framing on a satellite communication according to claim 1, wherein in step (1), the split identifier identifies the corresponding link layer frame as a complete frame, a head segment, a middle segment, and a tail segment.
5. The method for processing and forwarding satellite communication on-board low-resource consumption satellite-to-ground frame disassembly and assembly according to claim 1, wherein in the step (1), when the destination address of the link layer frame is a satellite, the frame type is defined as a management frame, the management frame is defined as a highest priority, the priority is filled, and the management frames of authentication, network entry and exit signaling and resource application class are smaller than a minimum burst length.
6. The method for processing and forwarding satellite communication on-board low-resource consumption satellite-to-ground frame disassembly according to claim 4, wherein in the step (2), the on-board switch performs reassembly according to a source address, a priority identifier and a disassembly identifier in a link layer frame header, and the specific processing procedure is as follows:
The space-borne exchanger carries out classification processing according to the splitting identification, if the splitting identification is a first segment, the local buffer memory is applied according to the source address and the priority identification in the frame header, if the splitting identification is a middle segment or a tail end, the payload of the link layer frame is stored in the applied local buffer memory in sequence according to the source address and the priority identification in the frame header, and meanwhile, after the tail end is received, the link layer frame is read from the buffer memory to carry out recombination processing, and the applied buffer memory is released.
7. The method for processing and forwarding satellite communication on-board low-resource consumption satellite-ground frame disassembly and assembly according to claim 1, wherein in the step (3), the receiving-side ground terminal firstly analyzes the destination address in the frame header of the link layer after receiving the link layer frame, and discards if the destination address is not the terminal.
8. The method for processing and forwarding satellite communication on-board low-resource consumption satellite-ground frame disassembly according to claim 4, wherein in the step (3), the reassembly is performed according to a source address, a priority identifier and a disassembly identifier in a link layer frame header, and the specific processing procedure is as follows:
and classifying according to the splitting identification, applying for local buffering according to the source address and the priority identification in the frame header if the splitting identification is the first segment, storing the payload of the link layer frame in the applied local buffering according to the source address and the priority identification in the frame header if the splitting identification is the middle segment or the tail end, simultaneously reading the link layer frame from the buffering for reorganization after receiving the tail end, and releasing the applied buffering.
9. The method for processing and forwarding satellite communication on-board low-resource consumption satellite-ground frame disassembly and assembly according to claim 8, wherein when the ground terminal receives the link layer frame disassembly identification as the first segment, searching whether the local buffer is applied according to the source address and the priority in the frame header, and releasing the applied buffer and re-applying the buffer if the local buffer is applied.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101106416A (en) * | 2007-06-25 | 2008-01-16 | 北京航空航天大学 | Connection-Oriented Communication Method for Spaceborne Routing and Switching System |
| CN101127703A (en) * | 2007-08-06 | 2008-02-20 | 北京航空航天大学 | Spaceborne Routing and Switching System for Broadband Satellite Communications |
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| US6859442B1 (en) * | 1997-10-20 | 2005-02-22 | Comsat Corporation | Method and system for transport of frame relay traffic over satellite/wireless networks |
| CN103281321B (en) * | 2013-05-24 | 2016-02-10 | 航天东方红卫星有限公司 | A kind of spaceborne FlexRay bus dynamic segment communication means |
| CN114449580B (en) * | 2021-12-22 | 2024-06-11 | 西安空间无线电技术研究所 | Physical layer data segmentation and recombination method for satellite communication system |
| CN114944867B (en) * | 2022-05-30 | 2023-12-29 | 中国电子科技集团公司第五十四研究所 | Circuit grouping time slot burst generation and analysis device based on IP |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106416A (en) * | 2007-06-25 | 2008-01-16 | 北京航空航天大学 | Connection-Oriented Communication Method for Spaceborne Routing and Switching System |
| CN101127703A (en) * | 2007-08-06 | 2008-02-20 | 北京航空航天大学 | Spaceborne Routing and Switching System for Broadband Satellite Communications |
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