CN104168053A - LLC order-arranging processing method based on multi-relay transmission condition - Google Patents
LLC order-arranging processing method based on multi-relay transmission condition Download PDFInfo
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Abstract
The invention relates to an LLC order-arranging processing method based on a multi-relay transmission condition. The steps are as follows: adding LLC capsulation on data between a network layer and a space data link layer and after the capsulation, adopting deep-space relay communication protocol stack configuration of an ENCAP service to package the ENCAP service of the space data link layer into a packet and then into Promixity-1 transmission frames at last and carrying out transmission to different relay satellites through the Promixity-1; the relay satellites carrying out de-capsulation on the received Promixity-1 transmission frames according to a Promixity-1 protocol and then carrying out de-capsulation according to the ENCAP service; taking out a data domain, wherein data of the data domain are LLC frames and then the relay satellites transmitting the data to one or more ground stations through an AOS protocol; and the ground stations sequentially carrying out AOS de-capsulation and ENCAP de-capsulation after receiving the data of the relay satellites and carrying out order arrangement according to frame serial numbers in the LLC frames through a reception window of an LLC layer after obtaining the LLC frames so that original data is restored. Order arrangement is carried out on data frames according to the serial numbers of the LLC capsulation so that integrity and restorability of transmitted data files can be ensured.
Description
Technical field
The present invention relates to the whole order processing method of a kind of LLC based under many relay transmission condition.
Background technology
Abbreviation and Key Term definition
The senior system in-orbit of AOS 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 systems interconnection reference model, has proposed a series of Space communication protocols that are positioned at different agreement layer.CCSDS protocol architecture model as shown in Figure 1.CCSDS protocol architecture comprises from bottom to top: physical layer, data link layer, network layer, transport layer and application layer.Wherein, every one deck comprises again several agreements.Link layer protocol mainly contains remote measurement (TM) spatial data link agreement, remote control (TC) spatial data link agreement, senior system in-orbit (AOS) spatial data link agreement and low coverage spatial data link agreement (Proximity-1).
Due to the impact of celestial body autobiography and revolution, the communication link of space probe and ground station is a connection breaking.In addition,, due to long delay, high bit error in deep space communication, the point-to-point communication efficiency of space probe and ground station is not high.For these problems, the conception of repeater satellite has been proposed.
As shown in Figure 2, upper figure is existing deep space trunking traffic protocol stack arrangement, the data that space probe produces are transferred to spatial data link layer after transport layer and network layer encapsulation, be packaged into Proximity-1 transmission frame, send to each repeater satellite, repeater satellite carries out extracting initial data after decapsulation to the data that receive, then is packaged into AOS protocol frame and is transmitted to ground station.
But the bag version number (PVN) that need to have CCSDS to authorize due to the data cell of transmitting in spatial data link agreement, in order to make the data cell of unauthorized PVN, can in spatial data link, transmit, introduce ENCAP service, ENCAP service intention provides the data cell that a kind of mechanism makes with no authorized PVN in space link, to transmit.Added the protocol stack of ENCAP service to be 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 service, the data that space probe produces are transferred to spatial data link layer after transport layer and network layer encapsulation, the ENACP service of spatial data link layer is first packaged into wrapper, again wrapper is encapsulated as to Proximity-1 protocol frame, then send to repeater satellite, repeater satellite carries out extracting initial data after decapsulation to the data that receive, then is packaged into AOS protocol frame and is transmitted to ground station.
Fig. 4 is the conceptual model of ENCAP service, the ENCAP service of data link layer by do not obtain authorize the protocol Data Unit A of PVN and B to be packaged into space bag or wrapper (in the application scenarios of existing packing service, main application is to be packaged into wrapper, also will set forth with wrapper below herein), then by spatial data link agreement, transmit.
Wrapper structure is as shown in table 1,
Table 1 wrapper structure
Table 2 wrapper head
Wrapper head is as shown in table 2, and wrapper head You Bao version number, protocol identifier, long length, user-defined domain, protocol identifier expansion, the CCSDS domain of definition and the packet length of bag sequentially rearrange, and concrete structure and value are as shown in table 2.
Bag version number: the packet of indication transmission is spatial data bag or wrapper:
' 001 ' represents that the data of transmission are space bags;
What ' 111 ' expression was transmitted is CCSDS wrapper;
Protocol identifier (3 bit): the protocol type of indicating packed packet to use
' 000 ' indicates packed packet for empty bag;
' 110 ' indication increases the protocol type that the attached extended field of protocol-identifier (4 bit) is indicated packed packet;
' 111 ' protocol type of indicating packed packet to use is user-defined protocol type, and need to increase user-defined domain field (4 bit);
The definition of other fields is with reference to CCSDS 133.1-B-2.
If as shown in Figure 2, what in protocol stack, transmit is space bag, through too much relay transmission, while converging in ground station, can carry out whole order according to the sequence number field in bag packet header, space, according to the order of sequence data is transmitted to upper strata.
If what use in the network layer of protocol stack is other network layer protocols, what apply is the protocol stack based on ENCAP service as shown in Figure 3.As used IP agreement in network layer, what in protocol stack, transmit is IP bag, is not used in the sequence number field that ground station converges whole order in IP packet format.Therefore under the scene of many repeater satellites, when converging data, ground station to carrying out whole order to the data from a plurality of repeater satellites, is illustrated in fig. 5 shown below.
Space probe is distributed a plurality of repeater satellites by data by Proximity-1 agreement, repeater satellite passes through AOS protocol transmission to ground station by the data that receive, because each repeater satellite encapsulates the AOS Frame of oneself separately, so upset the PS of data.When ground station converges data, only have the sequence number of AOS frame, can only carry out whole order according to the sequence number of AOS frame, and cannot know from the sequencing of each repeater satellite reception data, cause data can not recover initial data when ground station converges.
Summary of the invention
The problem that object of the present invention exists in order to overcome above-mentioned prior art, and provide the whole order processing method of a kind of LLC based under many relay transmission condition, scene for the many repeater satellites network architecture based on ENCAP service, proposition adds LLC encapsulation in protocol stack, space probe first carries out LLC encapsulation to data, and then data are arrived to ground station by a plurality of repeater satellite transparent transmission, first data realize the whole order of LLC when ground station converges, recover original data.
Technical scheme of the present invention is:
The whole order processing method of LLC based under many relay transmission condition, is characterized in that carrying out according to the following steps:
Step 1, space probe first add logic link control LLC encapsulation between network layer and spatial data link layer to data, after first data being carried out to LLC encapsulation, the deep space trunking traffic protocol stack arrangement that adopts encapsulation (ENCAP) service, LLC encapsulation format is: head is that LLC sequence number, data field are that upper layer data bag, error control territory are CRC;
Step 2, the packaged ENCAP service encapsulates that becomes LLC frame to pass through again the spatial data link layer of space probe afterwards of LLC become wrapper, finally be packaged into Proximity-1 transmission frame, by low coverage spatial data link agreement, Proximity-1 is transferred to different repeater satellites;
Step 3, repeater satellite carry out decapsulation to the Proximity-1 transmission frame of receiving according to Proximity-1 agreement, according to ENCAP service, carry out decapsulation again, take out data field, the data of data field are LLC frame, and repeater satellite transfers data to 1 or a plurality of ground station by the senior AOS of system in-orbit agreement;
Step 4, ground station receive after the data of each repeater satellite, carry out successively AOS decapsulation, ENCAP decapsulation, obtain after LLC frame, and the receive window by LLC layer carries out whole order according to the frame number in LLC frame, restores original data.
LLC sequence number length is 32 bits.The LLC sequence number of LLC encapsulation, is mainly used in whole order.
Data field: fill from upper layer data bag.
Error control length of field is 32 bits.For whole LLC frame is carried out to CRC detection, this field is Optional Field, if this field exists, the figure place of CRC (figure place has determined loss, and the more loss of figure place are lower) can need to be carried out suitable expansion according to application.
The wrapper form of described step 2 is the encapsulation packet header of existing ENCAP service and packed data field, just in the user-defined domain in the encapsulation packet header of existing ENCAP service, fills the data field that is used for identifying LLC frame.
The size of the receive window of described step 4 is relevant with the bit number of LLC frame number, if LLC frame number is N bit, receive window is less than or equal to 2
n.
Beneficial effect of the present invention: 1, do not revise on the basis of ENCAP Service Level Agreement, increase LLC encapsulation, the transmission data by many repeater satellite links have improved throughput; 2, the sequence number encapsulating by LLC is carried out whole order to Frame, has guaranteed integrality and the restorability of the data file of transmission; 3,, based on LLC frame number and retransmission mechanism, when link failure or switching repeater satellite, can guarantee the complete transmission of data.
Accompanying drawing explanation
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 service.
Fig. 4 is existing ENCAP service concept model schematic diagram.
Fig. 5 is existing many relay datas transmitting procedure figure.
Fig. 6 is that the present invention increases the LLC deep space trunking traffic protocol stack arrangement figure based on ENCAP service afterwards.
Fig. 7 is many relay datas transmitting procedure figure of the present invention.
Fig. 8 is the many relay datas transmitting procedure figure when a link failure wherein of the present invention.
Embodiment
The invention will be further described by reference to the accompanying drawings.
As shown in Figure 6, increased the deep space trunking traffic protocol stack arrangement of LLC encapsulation employing ENCAP service afterwards.Between network layer and spatial data link layer, add LLC encapsulation, encapsulation format is as table 3:
Table 3 is LLC encapsulation format
| Head | Data field | Error control territory |
| LLC sequence number | Upper layer data bag | CRC (optional) |
LLC sequence number length is the sequence number of 32 bits: LLC encapsulation, is mainly used in whole order;
Data field: fill from upper layer data bag;
Error control length of field is 32 bits: for whole LLC frame is carried out to CRC detection, this field is Optional Field, if this field exists, the figure place of CRC can need to be carried out suitable expansion according to application;
The ENCAP service encapsulates that becomes LLC frame to pass through again the spatial data link layer of space probe after LLC is packaged becomes wrapper, finally be packaged into Proximity-1 transmission frame, by low coverage spatial data link agreement, Proximity-1 is transferred to different repeater satellites; Repeater satellite transfers data to 1 or a plurality of ground station by AOS agreement;
Ground station receives after the data of each repeater satellite, carry out successively AOS decapsulation, ENCAP decapsulation, obtain after LLC frame, (size of receive window is relevant with the bit number of LLC frame number for the receive window by LLC layer, if LLC frame number is N bit, receive window is less than or equal to 2
n) according to the frame number in LLC frame, carry out whole order, restore original data.
ENCAP service encapsulates packet format for LLC frame
As shown in Figure 6, on spatial data link layer, having increased LLC encapsulation, therefore need in the ENCAP of Data-Link layer service, define LLC data type, is in ENCAP service, to identify self-defining data type.
Still use the wrapper form of existing ENCAP service, wrapper form as shown in table 1, encapsulation package head format does not change, and has just applied the user-defined domain in encapsulation packet header, is used for identifying LLC agreement, as shown in table 4 below:
Table 4 encapsulation packet header (data field field is LLC frame)
Bag version number's (3 bit): assignment is ' 111 ', and indicating current bag is wrapper;
Protocol identifier field (3 bit): assignment is ' 111 ', the packet of indicating current encapsulation is self-defining packet;
The length field (2 bit) that bag is long: two values of this field ' 10 ' and ' 11 ', according to the length of packed packet is adaptive, select.After this field is selected, packet length field has been determined;
User-defined domain field (4 bit): get a value (as long as other values that defined of discord overlap) between 1～15, what indication was filled at the data field of this wrapper is LLC frame;
Protocol-identifier extended field (4 bit): assignment ' 0000 ', does not have other meaning here, in order to make to encapsulate packet header byte-aligned.
Embodiment mono-:
1, take space probe, simultaneously to process connection status with 3 repeater satellites be example, as shown in Figure 7:
Space probe:
Upper layer data is carried out to LLC encapsulation, in LLC frame, all have respectively LLC frame number separately;
Space probe is according to the routing capabilities of each repeater satellite, LLC frame is become to wrapper by ENCAP service encapsulates, finally be packaged into Proximity-1 transmission frame and send to different repeater satellites, during encapsulation Proximity-1 transmission frame, the sequence number that sends to the Proximity-1 transmission frame of each repeater satellite is all since 0 counting.As shown in Figure 4: it is 0,1,2,3 that space probe sends to the LLC sequence number of the data of repeater satellite 1 ... the sequence number that is packaged into Proximity-1 transmission frame is 0,1,2,3 ... the LLC sequence number that sends to repeater satellite 2 is 4,5 ..., the sequence number that is packaged into Proximity-1 transmission frame is 0,1,2,
Repeater satellite:
Each repeater satellite carries out decapsulation to the Proximity-1 transmission frame of receiving according to Proximity-1 agreement, according to ENCAP service, carry out decapsulation again, take out data field, the data of data field are LLC frame, i.e. LLC encapsulation is transparent (there is no the operation about LLC encapsulation or decapsulation at repeater satellite) for repeater satellite side;
Each repeater satellite respectively by LLC frame separately first through after ENCAP service, be finally packaged into AOS transmission frame, send to ground station;
Ground station:
The AOS transmission frame of receiving is carried out to decapsulation and ENCAP decapsulation, take out LLC frame and upwards submit to;
At the receive window of LLC layer, (size of receive window is relevant with the bit number of LLC frame number, if LLC frame number is N bit, receive window is less than or equal to 2
n) according to the frame number of LLC frame, Frame is carried out to whole order, then upwards submit to according to the order of sequence.
When link failure between space probe and certain repeater satellite, the LLC that can trigger space probe side retransmits, the LLC Frame that resends bust this by other links (link between space probe and other repeater satellites), is illustrated in fig. 8 shown below:
Space probe while and 3 repeater satellites are in connection status, and space probe carries out the distribution of data according to the situation of 3 links.Link between space probe and repeater satellite 1 lost efficacy after sending No. 1 bag as shown in Figure 8, No. 2 bags and all bust thiss of data that are transferred to repeater satellite 1 after it.Now, trigger the retransmission mechanism of LLC layer, by the packet of No. 2, the packet of bust this and failure below, resend to the repeater satellite 2 (explanation of indication conduct herein, specifically should select according to link condition to that repeater satellite the data packet transmission losing efficacy before on link), guaranteed the complete transmission of data.
Claims (5)
1. the whole order processing method of the LLC based under many relay transmission condition, is characterized in that carrying out according to the following steps:
Step 1, space probe first add logic link control LLC encapsulation between network layer and spatial data link layer to data, after first data being carried out to LLC encapsulation, the deep space trunking traffic protocol stack arrangement that adopts encapsulation ENCAP service, LLC encapsulation format is: head is that LLC sequence number, data field are that upper layer data bag, error control territory are CRC;
Step 2, the packaged ENCAP service encapsulates that becomes LLC frame to pass through again the spatial data link layer of space probe afterwards of LLC become wrapper, finally be packaged into Proximity-1 transmission frame, by low coverage spatial data link agreement, Proximity-1 is transferred to different repeater satellites;
Step 3, repeater satellite carry out decapsulation to the Proximity-1 transmission frame of receiving according to Proximity-1 agreement, according to ENCAP service, carry out decapsulation again, take out data field, the data of data field are LLC frame, and repeater satellite transfers data to 1 or a plurality of ground station by the senior AOS of system in-orbit agreement;
Step 4, ground station receive after the data of each repeater satellite, carry out successively AOS decapsulation, ENCAP decapsulation, obtain after LLC frame, and the receive window by LLC layer carries out whole order according to the frame number in LLC frame, restores original data.
2. the whole order processing method of the LLC based under many relay transmission condition according to claim 1, is characterized in that: LLC sequence number length is 32 bits.
3. the whole order processing method of the LLC based under many relay transmission condition according to claim 1, is characterized in that: error control length of field is 32 bits.
4. the whole order processing method of the LLC based under many relay transmission condition according to claim 1, it is characterized in that: the wrapper form of described step 2 is the encapsulation packet header of existing ENCAP service and packed data field, just in the user-defined domain in the encapsulation packet header of existing ENCAP service, fills the data field that is used for identifying LLC frame.
5. the whole order processing method of the LLC based under many relay transmission condition according to claim 1, it is characterized in that: the size of the receive window of described step 4 is relevant with the bit number of LLC frame number, if LLC frame number is N bit, receive window is less than or equal to 2
n.
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| CN111277319A (en) * | 2020-01-20 | 2020-06-12 | 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 |
| CN114614877A (en) * | 2022-01-18 | 2022-06-10 | 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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