CN102970111A - Redundant-coding-based multi-channel access method for satellite network communication - Google Patents
Redundant-coding-based multi-channel access method for satellite network communication Download PDFInfo
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Abstract
The invention relates to a redundant-coding-based multi-channel access method for satellite network communication. According to the redundant-coding-based multi-channel access method for satellite network communication, with the adoption of a redundant-coding-based multi-channel access manner, the bit error ratio of a satellite-earth link in satellite communication is effectively reduced, and the reliability of satellite communication is improved. A terminal in a system supports multimode communication and can access to a satellite through multiple heterogeneous links, two parts of data are formed in a manner that the data is encoded at the terminal, one part of the data is a coded sequence with a certain error correction capability, the other part of the data is redundant data used for improving the error correction capability, one link is selected to transmit the coded sequence, and the other links are used for transmitting the redundant data, so that compared with condition that the same data is transmitted by multiple paths in traditional multi-path parallel transmission, the data transmission amount is effectively reduced, and the effective throughput of users is increased.
Description
Technical field
The present invention relates to a kind of terminal access satellite method, the characteristics that are mainly used in resisting the satellite-ground link high bit error improve the satellite-ground link communication reliability, belong to technical field of satellite communication.
Background technology
Satellite link is divided into inter satellite link and satellite-ground link, and inter satellite link is mainly take the free-space propagation loss as main, the error code Gaussian distributed; The fading environment of satellite-ground link is complicated, and influencing factor comprises: impact that multipath fading, shade cover and the distinctive rain of Ka wave band declines etc.The characteristics of satellite link comprise: long delay, high bit-error and uplink downlink are asymmetric.Wherein high bit-error (BER) affects the reliability of satellite link.Forward error correction (FEC) is coded in to a certain extent can the compensate for channel error code, but has reduced the validity of transfer of data.
Redundant data transmissions is the main method of current assurance data transmission credibility, such as multipath or re-transmission.Wherein, the multipath method makes up mulitpath between source and destination (sink), by data message is transmitted to increase simultaneously the reliability of transfer of data along mulitpath.Retransmit main every leapfrog on individual paths and transmit many piece of data backups.Their main thought is exactly with transfer of data repeatedly or many parts, to resist loss of data, guarantees that data can successfully be transferred to the destination.The multipath method is from end-to-end assurance reliability, and most of repeating method is to guarantee reliability between every leapfrog, and therefore, multipath is generally many than retransmitting power consumption.But repeating method all concentrates on all data traffics on one paths, is unfavorable for balancing energy; Node failure is larger on the impact of individual paths, and therefore, the robustness of multipath is stronger; In addition, retransmitting has increased channel competition, is occuring when congested, if dispatch improperly, does not only reach the reliability of expection, also can continue to worsen congested, causes a large amount of coated abandoning, and reduces network throughput.In addition, each leapfrog retransmits the transmission delay that can increase message, and many emergencies all are delay-sensitives.Therefore, specifically use any method mainly to depend on the demand of application, if mainly pay close attention to low energy consumption and to the time-delay do not require, can select repeating method; If require flow equalization or low the delay, then can use the multipath method.
A major issue in the radio communication considers how to resist channel fading exactly, improves the reliability of transmission.Whether can effectively utilize Radio Resource under the prerequisite that guarantees the user data transmission reliability, be the key of design multiple access parallel transmission mechanism.The present invention proposes a kind of new multiplex switching, can reach the compromise of throughput and reliability.
Summary of the invention
Technical problem:The high bit-error of satellite link is one of inherent characteristic of satellite link, and the bit error rate (BER) of satellite channel (BER) is approximately 10
-6--10
-4The order of magnitude, this is higher than the high-speed wired medium far away.The various enchancement factors of space channel are so that channel is prone to burst error in addition.High bit-error (BER) affects the reliability of satellite link.Forward error correction (FEC) is coded in to a certain extent can the compensate for channel error code, but has reduced the validity of transfer of data.The invention provides in the communication of a kind of satellite network based on the multichannel cut-in method of redundancy encoding, be used for the high bit-error of opposing satellite channel, improve communication reliability, and with respect to traditional multidiameter delay
Transmission plan has reduced the data volume of transmitting, and has reached the compromise of throughput and reliability.
Technical scheme:May exist multilink to connect in the satellite communication between the communication terminal, usually only select wherein one as communication link, the method for Reliability Assurance mainly is forward error correction or autonomous retransmission.For proposing terminal on this basis, the problem the present invention who solves the satellite-ground link high bit-error accesses satellite in the mode that multichannel accesses, but what transmit in a plurality of access link is not identical data, but transmission has the coded sequence of certain error correcting capability and the redundant data that is used for improving error correcting capability respectively.Compare with traditional multidiameter delay transmission like this and reduced the transmission of data, improved throughput; Compare with simple error correction coding scheme, owing to increased redundant data, improved reliability.
The present invention has realized the set of multiplexing, error correction coding and autonomous retransmission technology, does not cause the larger reduction of throughput when improving communication reliability because of too much transmission of redundant data.Implementation model as shown in Figure 1.
One, architecture
Formed by terminal, access star and ground station or other transferring equipment three parts based on system of the present invention, as shown in Figure 1.Below each several part is specifically described:
(1) terminal: refer to the equipment of various requirement access satellite network, such as aircraft, boats and ships etc.Suppose that herein each end supports multi-mode communication when multiple heterogeneous network.
(2) satellite system: comprise high rail satellite system and LEO Satellite.Wherein high rail satellite mainly is responsible for exchange and the forwarding of packets of information, and low orbit satellite is done the access star, mainly is responsible for the terminal access.Terminal is according to the selected wish access satellite of certain access scheme, and terminal is by access star access satellite network.
(3) ground station or other transferring equipment: these equipment are directly linked to each other by link with satellite on the one hand, can have the communication link that links to each other with terminal again on the other hand, and this just provides redundant link for terminal and linking to each other of satellite.
Two, method flow
When a terminal is carried out data communication with the access star, carry out with following steps:
Step 1: before the terminal access satellite satellite link tolerable error rate is set.Then terminal is deleted ad-hoc location in the convolution code and is formed the deletion convolution code the initial data formation convolution code of encoding, and selects suitable access star to communicate.
Step 2: regularly judge that according to the link feedback link error rates is whether in the tolerable error rate.If in the tolerable scope, then continue to communicate by letter by former mode, if exceed the tolerable scope, then change step 3 over to.
Step 3: find out terminal and can be linked into other redundant links of current access star and judge whether the redundant link that finds is available free, if the available free step 4 that then changes over to, otherwise, change step 4 over to after the wait link idle.
Step 4: former communication link still transmits the deletion convolution code, deleted redundant data when redundant link transmission generates the deletion convolution code by convolution code.
Step 5: data reach access during star, deposit access star buffering area in, then the deletion convolution code are carried out single channel decoding, if decipher errorless or error code can deleted convolution code self be corrected, and received code sequence and abandon the redundant data of another road transmission then.Change step 7 over to.
Step 6: the wrong and error code of single channel decoding can not be corrected by deletion convolution code self and wait for that then redundant data arrives, and merges decoding with redundant data, merges that decoding is wrong and wrong can not correct then by the pooling information sequence that notification terminal retransmits; Merging is deciphered errorless or error code can be corrected by the pooling information sequence, then change step 7 over to.
Step 7: transmission success, return the ACK acknowledgement frame to terminal.
Beneficial effect:The present invention proposes the multiplex switching that is used for promoting connection reliability in a kind of satellite communication.Each path transmission content of tradition multichannel access parallel transmission is identical, resource utilization is low, the effective throughput that the user obtains is not high, the present invention compares with traditional multiplexing scheme, reduced transmitted data amount, take 2 tunnel accesses as example, a link transmission coded information sequences, another road is no longer transmitted identical data but is only transmitted a small amount of redundant data.
The present invention compares with traditional single channel error correction coding transmission means, has reduced the error rate, has improved communication reliability, is analyzed as follows:
With 2 tunnel accesses, the access way of convolution coding is example
Suppose original data bits K bit through convolutional encoding, data are N bit behind the coding, and can correct D mistake, by the certain bits in the convolution code of N bit is deleted, form the deletion convolution code of n bit, can correct d mistake.
Select a link to send the deletion convolution code of n bit, another link sends the redundant information of N-n bit.
Represent that with Ae decoding is wrong separately to a link, (AB)
eIt is still wrong to represent that two link datas merge decoding, then finds that in receiving terminal decoding wrong probability is:
Wherein
With just compare with the deletion convolution code, increased redundant data, improved reliability and just compared with convolution code, increased once the detection of deletion convolution code, also can improve reliability.
Description of drawings
Fig. 1 is implementation model figure of the present invention.
Fig. 2 is the architecture according to multiplex switching of the present invention, mainly comprises: terminal (aircraft, boats and ships etc.), satellite system and ground station or other terminals.
Fig. 3 is based on the algorithm flow chart of multichannel access.
Embodiment
For convenience of description, we are take Fig. 2 Scene as example, and terminal is aircraft, the access star is the satellite that directly links to each other with aircraft, two links of existence between terminal and the access star, one is the link that terminal is direct and the access astrology connects, another is through ground station and accesses astrology even.Terminal adopts deletion convolution coding mode.
When terminal is communicated by letter with the access star, carry out according to the following steps:
Step 1: before the terminal access satellite satellite link tolerable error rate is set.Then terminal is deleted ad-hoc location in the convolution code and is formed the deletion convolution code the initial data formation convolution code of encoding, and selects suitable access star to communicate.
Step 2: regularly judge that according to the link feedback link error rates is whether in the tolerable error rate.If in the tolerable scope, then continue to communicate by letter by former mode, if exceed the tolerable scope, then change step 3 over to.
Step 3: find out terminal and can be linked into other redundant links of current access star and judge whether the redundant link that finds is available free, if the available free step 4 that then changes over to, otherwise, change step 4 over to after the wait link idle.
Step 4: choose and access the link transmission deletion convolution code that star directly links to each other, deleted redundant data when the link transmission that links to each other through ground station generates the deletion convolution code by convolution code.
Step 5: data reach access during star, deposit access star buffering area in, then the deletion convolution code are carried out single channel decoding, if decipher errorless or error code can deleted convolution code self be corrected, and received code sequence and abandon the redundant data of another road transmission then.Change step 7 over to.
Step 6: the wrong and error code of single channel decoding can not be corrected by deletion convolution code self and wait for that then redundant data arrives, and merges decoding with redundant data, merges that decoding is wrong and wrong can not correct then by the pooling information sequence that notification terminal retransmits; Merging is deciphered errorless or error code can be corrected by the pooling information sequence, then change step 7 over to.
Step 7: transmission success, return the ACK acknowledgement frame to terminal.
Claims (1)
- In the satellite network communication based on the multichannel cut-in method of redundancy encoding, it is characterized in that terminal accesses satellite with multi-channel approach, and its each link no longer transmits identical data, but choose the coded sequence that a link transmission has error correcting capability, other link transmission are used for improving the redundant data of error correcting capability; Its purpose is to resist the high bit-error characteristics of satellite-ground link, improves communication reliability, and concrete scheme is as follows:Step 1: before the terminal access satellite satellite link tolerable error rate is set, then terminal is deleted ad-hoc location in the convolution code and is formed the deletion convolution code the initial data formation convolution code of encoding, and selects suitable access star to communicate;Step 2: regularly judge that according to the link feedback link error rates whether in the tolerable error rate, if in the tolerable scope, then continues to communicate by letter by former mode, if exceed the tolerable scope, then change step 3 over to;Step 3: find out terminal and can be linked into other redundant links of current access star and judge whether the redundant link that finds is available free, if the available free step 4 that then changes over to, otherwise, change step 4 over to after the wait link idle;Step 4: former communication link still transmits the deletion convolution code, deleted redundant data when redundant link transmission generates the deletion convolution code by convolution code;Step 5: when data reach the access star, deposit access star buffering area in, then the deletion convolution code is carried out single channel decoding, if decipher errorless or error code can deleted convolution code self be corrected, then received code sequence and abandon the redundant data of another road transmission changes step 7 over to;Step 6: the wrong and error code of single channel decoding can not be corrected by deletion convolution code self and wait for that then redundant data arrives, and merges decoding with redundant data, merges that decoding is wrong and wrong can not correct then by the pooling information sequence that notification terminal retransmits; Merging is deciphered errorless or error code can be corrected by the pooling information sequence, then change step 7 over to;Step 7: transmission success, return the ACK acknowledgement frame to terminal.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105187176A (en) * | 2015-08-07 | 2015-12-23 | 中国运载火箭技术研究院 | Electrical system provided with redundant link and communication method thereof |
| CN110120853A (en) * | 2019-05-24 | 2019-08-13 | 中国科学院计算机网络信息中心 | Data transmission, reception device and data sending, receiving method under multiple link environment |
| WO2020034195A1 (en) * | 2018-08-17 | 2020-02-20 | 西门子股份公司 | Industrial application data sending and receiving method and apparatus |
| CN113783775A (en) * | 2021-03-09 | 2021-12-10 | 北京京东尚科信息技术有限公司 | Data transmission method and device |
| CN114915379A (en) * | 2022-07-18 | 2022-08-16 | 中国科学院空天信息创新研究院 | Remote sensing satellite data receiving and recovering method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105187176A (en) * | 2015-08-07 | 2015-12-23 | 中国运载火箭技术研究院 | Electrical system provided with redundant link and communication method thereof |
| WO2020034195A1 (en) * | 2018-08-17 | 2020-02-20 | 西门子股份公司 | Industrial application data sending and receiving method and apparatus |
| CN110120853A (en) * | 2019-05-24 | 2019-08-13 | 中国科学院计算机网络信息中心 | Data transmission, reception device and data sending, receiving method under multiple link environment |
| CN113783775A (en) * | 2021-03-09 | 2021-12-10 | 北京京东尚科信息技术有限公司 | Data transmission method and device |
| CN114915379A (en) * | 2022-07-18 | 2022-08-16 | 中国科学院空天信息创新研究院 | Remote sensing satellite data receiving and recovering method |
| CN114915379B (en) * | 2022-07-18 | 2022-10-14 | 中国科学院空天信息创新研究院 | Remote sensing satellite data receiving and recovering method |
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Application publication date: 20130313 Assignee: Jiangsu Nanyou IOT Technology Park Ltd. Assignor: Nanjing Post & Telecommunication Univ. Contract record no.: 2016320000213 Denomination of invention: Redundant-coding-based multi-channel access method for satellite network communication Granted publication date: 20150204 License type: Common License Record date: 20161118 |
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