CN103795455A - User comprehensive weighted access method suitable for satellite data collection system - Google Patents
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- CN103795455A CN103795455A CN201410015630.6A CN201410015630A CN103795455A CN 103795455 A CN103795455 A CN 103795455A CN 201410015630 A CN201410015630 A CN 201410015630A CN 103795455 A CN103795455 A CN 103795455A
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Abstract
The invention discloses a user comprehensive weighted access method suitable for a satellite data collection system. The method comprises the steps that (A) regarding normal data services, when multiple satellites cover a data collection platform (DCP), the DCP carries out weighting on three factors of an access satellite idle channel number, satellite cover time and elevations to form a weighting target access function, the optimal satellite is selected for accessing, the facts that system switching expense is low and the switching failure rate is low in an access process are guaranteed, occurrence of channel deterioration is avoided, and parts of frequently called satellites are prevented from overload; (B) regarding emergency data services, the weighting coefficient of the weighting target access function is adjusted, and suitable satellites are selected to carry out accessing. If an accessed satellite has no idle channel, transmission of current normal data services is suspended, and preemption is carried out on channels. According to the user comprehensive weighted access method suitable for the satellite data collection system, the problem that the DCP selects the satellites to access when the multiple satellites cover the DCP in the satellite data collection system can be solved, the success rate for the DCP to access the satellites is improved, and throughput capacity of the system is improved.
Description
Technical field
The present invention relates to satellite communication field.Satellite communication can provide the broadband mobile service of Global coverage, and in satellite data acquisition system, in the time of multi-satellite cover data acquisition platform (DCP), choosing that best satellite accesses is to ensure the key factor of communication quality.The in the situation that of many stars cover data acquisition platform (DCP), can effectively choose access satellite by weighting target access function, improve access success rate, improve the throughput of system.
Background technology
The system of collecting in a large number ground and marine the number of signal sources with satellite becomes satellite data acquisition system, it is made up of measuring terminals, repeater satellite and satellite operation control center, be applicable to the data that have a very wide distribution, parameter is gradual and transmission rate is low gather and gather, its outstanding advantage is by setting up unattended data acquisition platform (DCP), can fast obtain easily the relevant information in satellite coverage.Current international DCS system is divided into two classes: DCS system (GEO DCS) and the near-earth orbit DCS system (LEO DCS) of the upper meteorological satellite of geostationary orbit (GEO).For avoiding high low-orbit satellite communication distance, path loss and DCP antenna are excessive, be unfavorable for the problem of miniaturization, this patent has proposed weights Access Algorithm for low-orbit satellite DCS system, to solve in low-orbit satellite DCS system, number of satellite is more, when multi-satellite covers same data acquisition platform simultaneously, and the problem that data acquisition platform selects satellite to access.
Data acquisition platform (DCP) when covering many LEO satellite communications of ground station, only need to access single satellite.Although number of satellite can satisfy the demands in theory, consider the difference of user distribution density, also and non-uniform Distribution, may there is multi-satellite and cover the situation of identical DCP in the covering of satellite.If now DCP takes the algorithm of random access, can cause the reduction of access success rate, thereby cut down the throughput of system, cause the reduction of data transmission quality.If now choose certain Admission Control, can effectively guarantee the probability of success of access.If carry out the design of Access Algorithm according to a certain factor in satellite cover time, satellite idle channel quantity, elevation angle factor etc., there is certain limitation, for example, if accessed according to satellite cover time selecting factors the longest satellite service time, likely cause accessing satellite distance DCP far away, cause larger time delay, the channel degradation that can not avoid the low elevation angle to bring, and likely cause access satellite load overweight, be unfavorable for load balancing; If accessed according to the elevation angle the shortest satellite of selecting factors transmission range, likely cause the satellite service time discontinuous, strengthen system handover overhead, cause the problem that handover failure rate is high, and the overweight problem of satellite load also cannot be avoided.Therefore comprehensive considering various effects, take weighted strategy design to be extensively suitable for and flexibly Access Algorithm be the best approach that effectively solves variety of issue.
Summary of the invention
This patent, according to the feature of satellite communication, proposes the aggregative weighted inserting of satellite strategy based on beeline strategy, longest service time strategy and load balancing.Wherein beeline strategy emphasis is considered elevation angle factor, and longest service time strategy emphasis is considered satellite cover time factor, and load balancing emphasis is considered access satellite idle channel factor.The parameter that above-mentioned three kinds of strategies are related to is weighted, and forms weighting target function, and according to actual conditions, the weight coefficient of above-mentioned three kinds of parameters is selected, calculated and determines, design is applicable to the cut-in method under different situations.This patent proposes in different business situation, change the weights coefficient of weighting target access function, adjust satellite idle channel quantity, satellite cover time, the affect proportion of three kinds, elevation angle factor on weighting target access function, form applicable cut-in method, in common data services situation, comprehensive satellite idle channel quantity, satellite cover time and three kinds of factors of transmission range are weighted, and select best inserting of satellite; Under emergency data service conditions, due to the urgent characteristic of transfer of data, can in the situation that there is no idle channel, seize the transmission channel of the current common data services of transmitting, and further aggregative weighted satellite cover time, two kinds of factors of transmission range, form weighting target cut-in method, select best satellite to access.This patent proposes satellite coverage to be divided into multiple cellular networks, and DCP is evenly distributed on the node of cellular network, first determines satellite coverage; Secondly determine the radius of cellular network according to DCP quantity, and DCP is evenly distributed on to the node of cellular network, by the mapping relations of DCP quantity in DCP quantity and coverage on radius, determine the distribution situation of the DCP in satellite coverage.
Accompanying drawing explanation
Fig. 1 data user aggregative weighted cut-in method schematic diagram
Fig. 2 data acquisition platform access process figure
Access strategy figure under the different weights coefficients of Fig. 3
Fig. 4 satellite coverage cellular network division methods
In Fig. 4:
1 represents satellite coverage;
2 represent satellite coverage radius;
3 represent the Cellular Networks marking off;
4 represent ground data acquisition platform.
Embodiment
In data acquisition system, in the situation of many stars cover data acquisition platform, data acquisition platform need to select best satellite to access by certain Access Algorithm, to guarantee to access successful probability, improves the throughput of system and guarantees higher transmission quality.In longest service time access strategy, owing to wanting priority access the longest satellite service time, cause with respect to beeline access strategy, the probability that satellite elevation angle is tending towards the low elevation angle increases; On the contrary, in beeline access strategy, owing to wanting the shorter satellite of priority access transmission range, with respect to longest service time access strategy, the probability that the satellite cover time shortens increases.Therefore, guaranteeing that satellite has on the basis of idle channel, need to design a kind of comprehensive weighted strategy, both retained the advantage that longest service time policy system handover overhead is little, handover failure rate is low, the channel degradation of avoiding again the lower elevation angle to bring, also to make the message volume in space be tending towards balanced simultaneously as far as possible, avoid calling out part satellite overload frequently.
For the transfer of data of general business, guaranteeing that the satellite that covers DCP has on the basis of idle channel, satellite idle channel quantity, satellite cover time, three kinds, elevation angle factor are weighted, select the satellite that idle channel quantity is many, balance network load, avoids calling out part satellite overload frequently; The satellite that the selection satellite cover time is grown, guarantees that service time is the longest, reduces to greatest extent switching times, reduces to switch the overhead causing, obtains lower handover failure rate; Selecting the elevation angle is more greatly the shorter satellite of transmission range, the channel degradation of avoiding the lower elevation angle to bring.In this patent, cover time and idle channel number adopt linear weighted function, because fading channel loss, capture-effect and the elevation angle exist non-linear relation, and satellite elevation angle employing nonlinear weight, when avoiding the elevation angle to get minimum angle of elevation, there is severe exacerbation in satellite channel.
For emergency data business, if there is idle channel in the satellite of covering DCP, carry out aggregative weighted access according to the access strategy of above-mentioned general business situation; If covered in the satellite of DCP all without idle channel, suspend the general business in the satellite that covers at present DCP, seize general business channel, ensure the transmission of emergency data business, then satellite cover time, three kinds of factors of transmission range are weighted, form applicable cut-in method, select the best to add satellite.
Data user's aggregative weighted cut-in method schematic diagram as shown in Figure 1.In the time having multi-satellite to cover terminal D CP, judge in the multi-satellite of covering DCP whether there is idle channel, if available free channel is carried out the target weighting cut-in method of comprehensive idle channel quantity, satellite cover time, the three kinds of factors in the elevation angle; If there is no idle channel, and the type of data service is general business, and DCP enters the state of waiting in line; If there is no idle channel, and the type of data service is urgency traffic, suspends the data transmission service of current satellite, seize the channel of general business, aggregative weighted satellite cover time and elevation angle factor, form applicable cut-in method, selects best satellite to access.
Data acquisition platform DCP access process figure as shown in Figure 2.In the time having new call request, call out and enter service list, consider cover time, transmission range strategy and load balancing and select satellite according to above-mentioned; According to access scheme selective channel, if accessed successfully, busy channel transmits data afterwards; If got clogged, remove service list item, request again behind certain hour interval.
Weighting target function formula when many stars are covered DCP by we is set as follows:
Wherein λ
1, λ
2, λ
3be respectively idle channel weight coefficient, satellite cover time weight coefficient, elevation angle weight coefficient, respectively channel status factor when representative information access, service time factor, distance factor.
C
freefor current single satellite idle channel number, c
allfor single satellite total channel number.T
overfor satellite cover time, T
mfor the maximum satellite cover time of system, θ is the current elevation angle, θ
mfor minimum angle of elevation.
Choose different λ values to determine different access strategies.Access strategy under different weights coefficients as shown in Figure 3.The value of different weights coefficients is 0 or 1, if do not consider this factor, weights coefficient is zero, if consider this factor, weights coefficient is 1.Set according to the actual requirements the weights coefficient of different factors, design is applicable to the cut-in method of different situations.
Consider that satellite covers the time factor of DCP, the overlay area of satellite is divided by honeycomb shape, satellite coverage area is divided figure as shown in Figure 4.First determine the coverage of satellite, and determine the quantity that needs the cellular network of dividing according to the quantity of satellite coverage DCP, and make DCP in coverage be evenly distributed on the node of the honeycomb of division, thereby calculate the DCP quantity on every radius, consider satellite features of movement, by the mapping relations of DCP quantity in DCP quantity and coverage on radius, determine the distribution situation of the DCP in satellite coverage.
Claims (3)
1. weights access strategy when this patent proposes data acquisition platform (DCP) access satellite, this strategy comprises:
A. consider satellite idle channel, satellite cover time, three kinds, elevation angle reference factor;
B. above-mentioned three kinds of parameters are weighted, form weighting target access function;
C. the weight coefficient of above-mentioned three kinds of parameters is selected, calculated and determines.
This strategy is the low advantage of retention system switching frequency both, avoids again, in access procedure, channel degradation occurs, and also needs to make the message volume in space to be tending towards balanced, avoids calling out part satellite overload frequently.
2. this patent proposes in different business situation, changes the weights coefficient of weighting target access function, adjusts satellite idle channel quantity, satellite cover time, the affect proportion of three kinds, elevation angle factor on weighting target access function, forms applicable cut-in method.The principle that changes weights coefficients have following some:
If A. class of business is general business, in the multi-satellite that covers DCP, select the satellite that idle channel quantity is many, if all satellites all do not have idle channel, enter the state of waiting in line (newly calling out) or handoff failure, (non-new calling) again makes a call; If class of business is urgency traffic, in the multi-satellite that covers DCP, select the satellite that idle channel quantity is many, if there is no idle channel in the multi-satellite of current covering DCP, suspend the transport service of current satellite, seize general business channel;
B. on the basis of guaranteeing available free channel, idle channel quantity, satellite cover time and elevation angle factor are weighted, select best satellite to access.
3. this patent proposes satellite coverage to be divided into multiple cellular networks, and DCP or terrestrial user are evenly distributed on the node of cellular network, and what time following partiting step be:
A. determine satellite coverage;
B. determine the radius of cellular network according to DCP quantity;
C.DCP is evenly distributed on the node of cellular network.
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Cited By (14)
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| CN106685514A (en) * | 2017-01-05 | 2017-05-17 | 清华大学 | Selection method and selection device of relay satellite |
| CN108243391A (en) * | 2016-12-23 | 2018-07-03 | 展讯通信（上海）有限公司 | Cell searching, cell accessing method and device in satellite communication |
| CN108733071A (en) * | 2017-04-24 | 2018-11-02 | 空中客车运营简化股份公司 | For by flight parameter from leading aircraft to be transmitted to the method for swarming into aircraft |
| CN111294110A (en) * | 2020-02-18 | 2020-06-16 | 中国科学院微小卫星创新研究院 | Beidou global short message satellite selection method based on satellite coverage service volume density |
| CN112104411A (en) * | 2020-11-10 | 2020-12-18 | 四川九洲电器集团有限责任公司 | Low-orbit satellite communication-oriented access satellite selection device and method |
| CN112751604A (en) * | 2020-12-16 | 2021-05-04 | 军事科学院***工程研究院网络信息研究所 | Multi-element composite weighted estimation method for broadband low-orbit satellite communication traffic |
| CN113037358A (en) * | 2021-03-02 | 2021-06-25 | 南京邮电大学 | Low-orbit satellite Internet of things service model based on attractor selection algorithm and multi-satellite load balancing algorithm |
| CN113114336A (en) * | 2021-03-19 | 2021-07-13 | 北京邮电大学 | Method and device for determining switching threshold in low-earth-orbit satellite communication network |
| CN113131984A (en) * | 2019-12-31 | 2021-07-16 | 大唐移动通信设备有限公司 | Method and device for indicating satellite coverage information |
| CN114173402A (en) * | 2021-12-09 | 2022-03-11 | 广州爱浦路网络技术有限公司 | User terminal dormancy control method, heaven-earth integrated communication network and storage medium |
| WO2022105621A1 (en) * | 2020-11-17 | 2022-05-27 | 重庆邮电大学 | Evolutionary game-based multi-user switching method in software-defined satellite network system |
| CN114900224A (en) * | 2022-04-15 | 2022-08-12 | 中国电子科技集团公司第十研究所 | Method for measuring and controlling satellite by aircraft handover target and related equipment |
| CN115913323A (en) * | 2022-10-14 | 2023-04-04 | 西安空间无线电技术研究所 | Low-orbit access selection method based on space-time grid and storage medium |
| WO2024120229A1 (en) * | 2022-12-08 | 2024-06-13 | 中国联合网络通信集团有限公司 | Data transmission method and apparatus, device, and storage medium |
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| CN108243391A (en) * | 2016-12-23 | 2018-07-03 | 展讯通信（上海）有限公司 | Cell searching, cell accessing method and device in satellite communication |
| CN108243391B (en) * | 2016-12-23 | 2020-06-12 | 展讯通信（上海）有限公司 | Cell search and cell access method and device in satellite communication |
| CN106685514A (en) * | 2017-01-05 | 2017-05-17 | 清华大学 | Selection method and selection device of relay satellite |
| CN106685514B (en) * | 2017-01-05 | 2019-08-23 | 清华大学 | The selection method and device of repeater satellite |
| CN108733071A (en) * | 2017-04-24 | 2018-11-02 | 空中客车运营简化股份公司 | For by flight parameter from leading aircraft to be transmitted to the method for swarming into aircraft |
| CN108733071B (en) * | 2017-04-24 | 2021-04-13 | 空中客车运营简化股份公司 | Method for transmitting flight parameters from a lead aircraft to an intruding aircraft |
| CN113131984B (en) * | 2019-12-31 | 2022-12-02 | 大唐移动通信设备有限公司 | Method and device for indicating satellite coverage information |
| CN113131984A (en) * | 2019-12-31 | 2021-07-16 | 大唐移动通信设备有限公司 | Method and device for indicating satellite coverage information |
| CN111294110A (en) * | 2020-02-18 | 2020-06-16 | 中国科学院微小卫星创新研究院 | Beidou global short message satellite selection method based on satellite coverage service volume density |
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| CN112104411A (en) * | 2020-11-10 | 2020-12-18 | 四川九洲电器集团有限责任公司 | Low-orbit satellite communication-oriented access satellite selection device and method |
| CN112104411B (en) * | 2020-11-10 | 2021-04-06 | 四川九洲电器集团有限责任公司 | Low-orbit satellite communication-oriented access satellite selection device and method |
| US11765634B1 (en) | 2020-11-17 | 2023-09-19 | Chongqing University Of Posts And Telecommunications | Evolutionary game-based multi-user switching method in software-defined satellite network system |
| WO2022105621A1 (en) * | 2020-11-17 | 2022-05-27 | 重庆邮电大学 | Evolutionary game-based multi-user switching method in software-defined satellite network system |
| CN112751604A (en) * | 2020-12-16 | 2021-05-04 | 军事科学院***工程研究院网络信息研究所 | Multi-element composite weighted estimation method for broadband low-orbit satellite communication traffic |
| CN113037358A (en) * | 2021-03-02 | 2021-06-25 | 南京邮电大学 | Low-orbit satellite Internet of things service model based on attractor selection algorithm and multi-satellite load balancing algorithm |
| CN113114336B (en) * | 2021-03-19 | 2022-04-29 | 北京邮电大学 | Method and device for determining switching threshold in low-earth-orbit satellite communication network |
| CN113114336A (en) * | 2021-03-19 | 2021-07-13 | 北京邮电大学 | Method and device for determining switching threshold in low-earth-orbit satellite communication network |
| CN114173402A (en) * | 2021-12-09 | 2022-03-11 | 广州爱浦路网络技术有限公司 | User terminal dormancy control method, heaven-earth integrated communication network and storage medium |
| CN114900224A (en) * | 2022-04-15 | 2022-08-12 | 中国电子科技集团公司第十研究所 | Method for measuring and controlling satellite by aircraft handover target and related equipment |
| CN115913323A (en) * | 2022-10-14 | 2023-04-04 | 西安空间无线电技术研究所 | Low-orbit access selection method based on space-time grid and storage medium |
| WO2024120229A1 (en) * | 2022-12-08 | 2024-06-13 | 中国联合网络通信集团有限公司 | Data transmission method and apparatus, device, and storage medium |
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