CN104168053B - A kind of whole sequence processing methods of LLC based under the conditions of many relay transmissions - Google Patents
A kind of whole sequence processing methods of LLC based under the conditions of many relay transmissions Download PDFInfo
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Abstract
The present invention relates to a kind of whole sequence processing methods of LLC based under the conditions of many relay transmissions, step is as follows：Data are encapsulated between Internet and space data link layer plus LLC, using the deep space trunking traffic protocol stack arrangement of ENCAP services after encapsulation, wrapper is packaged into the ENCAP services of space data link layer, the transmission frames of Proximity 1 are finally packaged into, different repeater satellites are transferred to by Proximity 1；Repeater satellite is decapsulated to the transmission frames of Proximity 1 for receiving according to the agreements of Proximity 1, decapsulated further according to ENCAP services, data field is taken out, the data of data field are LLC frames, and repeater satellite transfers data to 1 or multiple earth stations by AOS agreements；After earth station receives the data of each repeater satellite, AOS decapsulations, ENCAP decapsulations are carried out successively, after obtaining LLC frames, whole sequence is carried out by frame number of the reception window of LLC layer in LLC frames, restore original data.The sequence number encapsulated by LLC carries out whole sequence to data frame, it is ensured that the integrality and restorability of the data file of transmission.
Description
Technical field
The present invention relates to a kind of whole sequence processing methods of LLC based under the conditions of many relay transmissions.
Background technology
Abbreviation and Key Term are defined
AOS Advanced Orbiting Systems Advanced Orbiting Systems
CCSDS Consultative Committee for Space Data Systems
International space data system Advisory Board
As shown in figure 1, CCSDS uses for reference the layering thought of open system interconnection reference model, it is proposed that a series of positioned at not
With the Space communication protocols of protocol layer.CCSDS protocol architecture models are as shown in Figure 1.CCSDS protocol architectures are wrapped from bottom to top
Include：Physical layer, data link layer, Internet, transportation level and application layer.Wherein, each layer includes several agreements again.Link layer
Agreement mainly has remote measurement (TM) space data link agreement, remote control (TC) space data link agreement, Advanced Orbiting Systems (AOS)
Space data link agreement and low coverage space data link agreement (Proximity-1).
Due to celestial body autobiography and the influence of revolution, the communication link of space probe and earth station is a connection breaking.This
Outward, because the characteristics of long delay, high bit error, the point-to-point communication of space probe and earth station is inefficient in deep space communication.
For these problems, it is proposed that the conception of repeater satellite.
As shown in Fig. 2 upper figure is existing deep space trunking traffic protocol stack arrangement, the data that space probe is produced are through transmission
Space data link layer is transferred to after layer and Internet encapsulation, Proximity-1 transmission frames are packaged into, each relaying is sent to and is defended
Star, repeater satellite extracts initial data after being decapsulated to the data for receiving, then is packaged into AOS protocol frames and is transmitted to ground
Face station.
But the bag version number of CCSDS mandates is needed due to the data cell transmitted in space data link agreement
(PVN), in order that the data cell of unauthorized PVN can be transmitted in space data link, ENCAP services, ENCAP clothes are introduced
Business is intended to a kind of mechanism of offer and enables that the data cell of with no authorized PVN is transmitted in space link.Add ENCAP clothes
The protocol stack of business is illustrated in fig. 3 shown below.
As shown in figure 3, upper figure is the deep space trunking traffic protocol stack arrangement based on ENCAP services, space probe is produced
Data encapsulated through transport layer and Internet after be transferred to space data link layer, the ENACP services of space data link layer are first
Wrapper is encapsulated into, then wrapper is encapsulated as Proximity-1 protocol frames, be then sent to repeater satellite, relaying is defended
Star extracts initial data after being decapsulated to the data for receiving, then is packaged into AOS protocol frames and is transmitted to earth station.
Fig. 4 is the conceptual model of ENCAP services, and the ENCAP services of data link layer will not obtain the agreement number for authorizing PVN
(main application is encapsulation in the application scenarios of existing packing service to be packaged into space bag or wrapper according to unit A and B
Into wrapper, will be also illustrated with wrapper herein below), then it is transmitted by space data link agreement.
Encapsulation pack arrangement is as shown in table 1,
Table 1 encapsulates pack arrangement
Table 2 encapsulates packet header
Encapsulation packet header is as shown in table 2, and encapsulation packet header is by wrapping version number, protocol identifier, wrapping length long, user certainly
Domain of definition, protocol identifier extension, CCSDS domain of definition and packet length order are rearranged, concrete structure and the value such as institute of table 2
Show.
Bag version number：The packet for indicating transmission is spatial data bag or wrapper：
' 001 ' represents that the data transmitted are space bags；
' 111 ' expression transmission are CCSDS wrappers；
Protocol identifier (3 bit)：The protocol type for indicating packed packet to use
' 000 ' indicates packed packet to be wrapped for empty；
' 110 ' indicate to increase protocol type of the attached extended field of the protocol-identifier (4 bit) to indicate packed packet；
The protocol type that the packed packet of ' 111 ' instructions is used is user-defined protocol type, and needs to increase use
Family custom zone field (4 bit)；
The definition of other fields refers to CCSDS 133.1-B-2.
If as shown in Fig. 2 in protocol stack transmit be space bag, through excessive relay transmission, when earth station converges,
The sequence number field that packet header can be wrapped according to space carries out whole sequence, sequentially by data to upper layer transport.
If using other network layer protocols in the Internet of protocol stack, that is, apply be it is as shown in Figure 3 based on
The protocol stack of ENCAP services.IP agreement such as is used in Internet, i.e., what is transmitted in protocol stack is IP bags, is not had in IP bag forms
There is the sequence number field that can be used in earth station converge whole sequence.Therefore under the scene of many repeater satellites, converged in earth station
To whole sequence cannot be carried out to the data from multiple repeater satellites when data, it is illustrated in fig. 5 shown below.
Data are distributed multiple repeater satellites by space probe by Proximity-1 agreements, and repeater satellite will be received
Data earth station is transferred to by AOS agreements, the AOS data frames of oneself are each encapsulated due to each repeater satellite, therefore upset
The PS of data.When earth station converges data, the only sequence number of AOS frames can only be entered according to the sequence number of AOS frames
The whole sequence of row, and the sequencing for receiving data from each repeater satellite cannot be known, then cause data when earth station converges
Initial data can not be recovered.
The content of the invention
The purpose of the present invention provides a kind of based on many relay transmission bars for the problem for overcoming above-mentioned prior art to exist
The whole sequence processing methods of LLC under part, for the scene of many repeater satellite network architectures serviced based on ENCAP, are proposed in agreement
LLC encapsulation is added in stack, space probe first carries out LLC encapsulation to data, it is then again that data are saturating by multiple repeater satellites
Bright to be transferred to earth station, data realize the whole sequences of LLC, recover original data first when earth station converges.
The technical scheme is that：
A kind of whole sequence processing methods of LLC based under the conditions of many relay transmissions, it is characterised in that carry out according to the following steps：
Step one, space probe first add logic link control to data between Internet and space data link layer
LLC is encapsulated, after first data are carried out with LLC encapsulation, the deep space trunking traffic protocol stack arrangement serviced using encapsulation (ENCAP),
LLC encapsulation format is：Head is LLC sequence numbers, data field is upper layer data bag, Error Control domain is CRC；
Taken by the ENCAP of the space data link layer of space probe again into LLC frames after step 2, LLC are packaged
Business is packaged into wrapper, Proximity-1 transmission frames is finally packaged into, by low coverage space data link agreement Proximity-
1 is transferred to different repeater satellites；
Step 3, repeater satellite are unsealed to the Proximity-1 transmission frames for receiving according to Proximity-1 agreements
Dress, is decapsulated further according to ENCAP services, takes out data field, and the data of data field are LLC frames, and repeater satellite is by senior
In-orbit system AOS agreements transfer data to 1 or multiple earth stations；
After step 4, earth station receive the data of each repeater satellite, AOS decapsulations, ENCAP decapsulations are carried out successively, obtain
To after LLC frames, whole sequence is carried out by frame number of the reception window of LLC layer in LLC frames, restore original data.
LLC sequence numbers length is 32 bits.The LLC sequence numbers of LLC encapsulation, are mainly used in whole sequence.
Data field：Filling comes from upper layer data bag.
Error Control length of field is 32 bits.For carrying out CRC detections to whole LLC frames, the field is Optional Field, if
The field is present, and the digit (digit determines loss, and digit is more, and loss is lower) of CRC can be fitted according to application needs
When extension.
The wrapper form of described step two is the encapsulation packet header and packed data field that existing ENCAP is serviced,
Simply filling is used for recognizing the data field of LLC frames in the user-defined domain in the encapsulation packet header of existing ENCAP services.
The size of the reception window of the step 4 is relevant with the bit number of LLC frame numbers, if LLC frame numbers is N ratios
Spy, then receive window and be less than or equal to 2N。
Beneficial effect of the present invention：1st, do not change on the basis of ENCAP Service Level Agreements, increase LLC encapsulation, by a plurality of
The transmission data of repeater satellite link improve handling capacity；2nd, the sequence number encapsulated by LLC carries out whole sequence to data frame, it is ensured that
The integrality and restorability of the data file of transmission；3rd, based on LLC frame numbers and retransmission mechanism, in link failure or cut
The complete transmission of data is can ensure that when changing repeater satellite.
Brief description of the drawings
Fig. 1 is existing CCSDS Space communication protocols system assumption diagram.
Fig. 2 is existing deep space trunking traffic protocol stack arrangement figure.
Fig. 3 is the existing deep space trunking traffic protocol stack arrangement figure based on ENCAP services.
Fig. 4 is existing ENCAP service concepts model schematic.
Fig. 5 is existing many relay data transmission procedure charts.
Fig. 6 is the deep space trunking traffic protocol stack arrangement figure based on ENCAP services after the present invention increases LLC.
Fig. 7 is many relay data transmission procedure charts of the invention.
Fig. 8 is many relay data transmission procedure charts when a wherein link failure of the invention.
Specific embodiment
With reference to accompanying drawing, the invention will be further described.
As shown in fig. 6, increased the deep space trunking traffic protocol stack arrangement of the use ENCAP services after LLC encapsulation.
Plus LLC encapsulation, encapsulation format such as table 3 between Internet and space data link layer：
Table 3 is LLC encapsulation format
| Head | Data field | Error Control domain |
| LLC sequence numbers | Upper layer data bag | CRC (optional) |
LLC sequence numbers length is 32 bits：The sequence number of LLC encapsulation, is mainly used in whole sequence；
Data field：Filling comes from upper layer data bag；
Error Control length of field is 32 bits：For carrying out CRC detections to whole LLC frames, the field is Optional Field, if
The field is present, and the digit of CRC can need to carry out appropriate extension according to application；
It is packaged into by the ENCAP services of the space data link layer of space probe again into LLC frames after LLC is packaged
Wrapper, is finally packaged into Proximity-1 transmission frames, is transferred to by low coverage space data link agreement Proximity-1
Different repeater satellites；Repeater satellite transfers data to 1 or multiple earth stations by AOS agreements；
After earth station receives the data of each repeater satellite, AOS decapsulations, ENCAP decapsulations are carried out successively, obtain LLC frames
Afterwards, by the reception window of LLC layer, (size for receiving window is relevant with the bit number of LLC frame numbers, if that LLC frame numbers is N
Bit, then receive window and be less than or equal to 2N) frame number in LLC frames carries out whole sequence, restores original data.
ENCAP for LLC frames services wrapper form
As shown in fig. 6, increased LLC encapsulation on space data link layer, it is therefore desirable to taken in the ENCAP of Data Link Layer
LLC data types defined in business, are to need to recognize user-defined dada type in ENCAP services.
Still the wrapper form for being serviced using existing ENCAP, wrapper form as shown in table 1 encapsulates package head format
It is not changed in, simply applies the user-defined domain in encapsulation packet header, it is as shown in table 4 below for recognizing LLC agreements：
The encapsulation of table 4 packet header (data field field is LLC frames)
Bag version number (3 bit)：' 111 ' are entered as, it is wrapper to indicate current bag；
Protocol identifier field (3 bit)：' 111 ' are entered as, the packet for indicating current encapsulation is customized data
Bag；
Wrap length field (2 bit) long：Two values ' 10 ' and ' 11 ' of the field, according to the length of packed packet
The carrying out for spending self adaptation selects.Packet length field is to determine after the field is selected；
User-defined domain field (4 bit)：Value is taken between 1~15 (as long as getting along well other defined mistakes
Value overlaps), what the data field indicated in the wrapper was filled is LLC frames；
Protocol-identifier extended field (4 bit)：Assignment ' 0000 ', herein without others meaning, in order that must encapsulate
Packet header byte aligns.
Embodiment one：
1st, so that space probe processes connection status with 3 repeater satellites simultaneously as an example, as shown in Figure 7：
Space probe：
LLC encapsulation is carried out to upper layer data, LLC frame ins all there are respective LLC frame numbers respectively；
LLC frames are packaged into encapsulation by space probe according to the routing capabilities of each repeater satellite by ENCAP services
Bag, is finally packaged into Proximity-1 transmission frames and is sent to different repeater satellites, during encapsulation Proximity-1 transmission frames, hair
The sequence number for giving the Proximity-1 transmission frames of each repeater satellite is started counting up from 0.As shown in Figure 4：Space probe is sent out
Give the LLC serial numbers 0,1,2,3 ... of the data of repeater satellite 1, the sequence number for being packaged into Proximity-1 transmission frames is 0,1,2,
3rd ..., the LLC sequence numbers for being sent to repeater satellite 2 are 4,5 ..., the sequence number for being packaged into Proximity-1 transmission frames is 0,1,
2、…；
Repeater satellite：
Each repeater satellite is decapsulated to the Proximity-1 transmission frames for receiving according to Proximity-1 agreements, then root
Decapsulated according to ENCAP services, taken out data field, the data of data field are LLC frames, i.e. LLC is encapsulated for repeater satellite side
For be it is transparent (i.e. repeater satellite on LLC encapsulate or decapsulation operation)；
After respective LLC frames are first passed through ENCAP services by each repeater satellite respectively, AOS transmission frames are finally packaged into, sent
To earth station；
Earth station：
AOS transmission frames to receiving are decapsulated and ENCAP decapsulations, are taken out LLC frames and are submitted to upwards；
In the reception window of LLC layer, (size for receiving window is relevant with the bit number of LLC frame numbers, if LLC frame numbers
It is N-bit, then receives window and be less than or equal to 2N) whole sequence is carried out to data frame according to the frame number of LLC frames, then sequentially carry upwards
Hand over.
When the link failure between space probe and certain repeater satellite, the LLC weights of space probe side are can trigger
Pass, the LLC data frames of bust this resend by other links (link between space probe and other repeater satellites),
It is illustrated in fig. 8 shown below：
Space probe is simultaneously and 3 repeater satellites are in connection status, and space probe enters according to the situation of 3 links
The distribution of row data.The link between space probe and repeater satellite 1 fails after No. 1 bag has been sent as shown in Figure 8, and 2
Number bag and data all bust this of repeater satellite 1 are transferred to behind.Now, then the retransmission mechanism of LLC layer is triggered, will be passed
The packet of defeated failure 2 and the packet of failure below, resend to repeater satellite 2 (be referred to shown as explanation,
The packet on failed link before specifically is transferred into that repeater satellite should be selected according to link condition), it is ensured that
The complete transmission of data.
Claims (5)
1. a kind of whole sequence processing methods of LLC based under the conditions of many relay transmissions, it is characterised in that carry out according to the following steps：
Step one, space probe first add logic link control LLC to data between Internet and space data link layer
Data are first carried out after LLC encapsulation by encapsulation, and the deep space trunking traffic protocol stack arrangement serviced using encapsulation ENCAP, LLC is sealed
Filling form is：Head is LLC sequence numbers, data field is upper layer data bag, Error Control domain is verification cyclic redundancy check (CRC)；
After step 2, LLC are packaged envelope is serviced into LLC frames by the ENCAP of the space data link layer of space probe again
Wrapper is dressed up, Proximity-1 transmission frames are finally packaged into, is passed by low coverage space data link agreement Proximity-1
It is defeated by different repeater satellites；
Step 3, repeater satellite are decapsulated to the Proximity-1 transmission frames for receiving according to Proximity-1 agreements, then
Decapsulated according to ENCAP services, taken out data field, the data of data field are LLC frames, and repeater satellite passes through senior in-orbit system
System AOS agreements transfer data to 1 or multiple earth stations；
After step 4, earth station receive the data of each repeater satellite, AOS decapsulations, ENCAP decapsulations are carried out successively, obtain LLC
After frame, whole sequence is carried out by frame number of the reception window of LLC layer in LLC frames, restore original data.
2. whole sequence processing methods of LLC based under the conditions of many relay transmissions according to claim 1, it is characterised in that：LLC
Sequence number length is 32 bits.
3. whole sequence processing methods of LLC based under the conditions of many relay transmissions according to claim 1, it is characterised in that：Difference
It is 32 bits that mistake controls length of field.
4. whole sequence processing methods of LLC based under the conditions of many relay transmissions according to claim 1, it is characterised in that：Institute
The wrapper form of the step of stating two is the encapsulation packet header of existing ENCAP services and packed data field, simply existing
Filling is used for recognizing the data field of LLC frames in user-defined domain in the encapsulation packet header of ENCAP services.
5. whole sequence processing methods of LLC based under the conditions of many relay transmissions according to claim 1, it is characterised in that：Institute
The size for stating the reception window of step 4 is relevant with the bit number of LLC frame numbers, if LLC frame numbers is N-bit, receives window
Mouth is less than or equal to 2N。
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| CN110808920B (en) * | 2019-10-29 | 2023-05-16 | 中国科学院国家空间科学中心 | Satellite communication flow control method with coexistence of CCSDS frame and IP message |
| CN111277319B (en) * | 2020-01-20 | 2022-08-16 | 中国电子科技集团公司电子科学研究院 | Inter-satellite-ground data transmission method and device |
| CN114614877B (en) * | 2022-01-18 | 2023-12-19 | 南京控维通信科技有限公司 | Satellite communication data packaging system based on TDM/TDMA system and packaging method thereof |
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| CN1642125A (en) * | 1999-02-22 | 2005-07-20 | B·G·罗伯特 | Wireless communication network including plural migratory access nodes |
| CN103825761A (en) * | 2014-02-26 | 2014-05-28 | 武汉大学 | On-board router simulation method of delay-tolerant network |
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| WO2010092545A1 (en) * | 2009-02-11 | 2010-08-19 | Nokia Corporation | Method and apparatus for reducing power consumption during data transfer |
| US20130128809A1 (en) * | 2011-05-19 | 2013-05-23 | Qualcomm Incorporated | Apparatus and methods for media access control header compression |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1642125A (en) * | 1999-02-22 | 2005-07-20 | B·G·罗伯特 | Wireless communication network including plural migratory access nodes |
| CN103825761A (en) * | 2014-02-26 | 2014-05-28 | 武汉大学 | On-board router simulation method of delay-tolerant network |
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