CN109600190B - Satellite communication system user link interference avoidance method based on frequency spectrum map - Google Patents
Satellite communication system user link interference avoidance method based on frequency spectrum map Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0066—Interference mitigation or co-ordination of narrowband interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/373—Predicting channel quality or other radio frequency [RF] parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18576—Satellite systems for providing narrowband data service to fixed or mobile stations, e.g. using a minisatellite, a microsatellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
Abstract
The invention discloses a spectrum map-based satellite communication system user link interference avoidance method, and aims to solve the problem of reliable communication of a satellite mobile communication system in a complex electromagnetic environment. The method is realized by the following technical scheme: the method comprises the steps of adopting five links of data acquisition and preprocessing, frequency spectrum map construction and distribution, frequency spectrum available condition prediction, interference avoidance decision generation and satellite-ground combined frequency spectrum resource allocation, wherein a user terminal and a satellite jointly acquire frequency spectrum map information of a user link of a satellite mobile communication system and report the information to a gateway station; the gateway station establishes a regional spectrum map and distributes the regional spectrum map to a network management center, and the network management center establishes a complete spectrum map of the satellite mobile communication system; the network management center adopts a frequent pattern mining algorithm to predict the available condition of the frequency spectrum and issues the generated interference avoidance strategy to the gateway station; and the gateway station generates a resource allocation instruction, and the satellite and the user terminal perform parameter reconfiguration according to the allocation instruction to complete system interference avoidance.
Description
Technical Field
The invention relates to a method which is mainly used in the field of satellite mobile communication, utilizes the multi-dimensional data presentation advantages of a frequency spectrum map, predicts the available condition of a frequency spectrum by combining a data mining method and realizes interference avoidance by satellite-ground combined frequency spectrum resource allocation.
Background
With the development of modern information network technology, a plurality of heterogeneous networks such as a satellite network (a communication satellite, a reconnaissance satellite, a meteorological satellite and the like), a ground internet, a mobile communication network and a foundation node network are fused and coexist, and frequency band overlapping regions inevitably exist among the heterogeneous networks such as air, sky, earth and sea, for example, a UHF frequency band and an S frequency band are used by a satellite mobile communication system and are concentrated in a range of 100 MHz-4 GHz, and the range is a key region for ground communication application, and interference among the networks sometimes occurs. Therefore, the interference avoidance is an effective means for maintaining normal communication of the satellite mobile communication system under the interference condition so as to ensure reliable communication of the system under the complex electromagnetic environment.
Satellite mobile communication systems typically utilize multi-beam satellite antennas for frequency reuse, which in turn creates interference problems for the system. For a satellite mobile communication, the interference is not only related to the system capacity, the multiple access method, etc., but also the performance of the satellite antenna is one of the main factors affecting the system interference. In order to improve the system capacity and the spectrum efficiency of the satellite-ground integrated communication system, the satellite network and the auxiliary ground network share a section of frequency, and the frequency reuse technology is adopted, so that the improvement of the system spectrum efficiency is facilitated, but inevitable co-frequency interference in the system is also brought. When multiple channel transmission devices are clustered in a limited space, severe mutual interference is caused. With the continuous emergence of various communication modes and the continuous increase of different service requirements of users, frequency spectrum resources are more and more tense, mutual interference effects generally exist, the forms are different, the communication efficiency is seriously influenced, and sometimes even serious blockage is caused to cause system failure. In an actual satellite mobile communication system, a user may be located at any position in a satellite spot beam and under various terrestrial environment conditions, so that system interference is very complex, and main interference types include co-channel interference, adjacent-frequency interference, out-of-band interference, intermodulation interference, blocking interference and the like. In order to ensure normal communication of a satellite mobile communication system in a complex electromagnetic environment, passive anti-interference methods such as optimizing a modulation mode, reasonably setting inter-channel guard intervals, optimizing a transmitting filter, and performing null steering in an airspace are often adopted in the satellite mobile communication system, but an active interference avoidance method based on cognitive radio is rarely reported.
The premise and the basis of interference avoidance are that frequency spectrum data are accurately acquired in real time, and only under the condition of knowing frequency spectrum occupation and interference intensity, the appropriate idle time slot and frequency band can be effectively selected to avoid interference, so that the establishment of a frequency spectrum database has an important influence on the interference avoidance effect. The spectrum map is a premise and a basis for accurate and real-time acquisition of spectrum data, and can be used for directly checking spectrum information such as occupied frequency bands, idle time periods, coverage ranges of specified frequency bands and the like by describing the spectrum data from multiple dimensions such as geographic positions, frequencies, time and energy.
Data mining is a decision support process, and spectrum sensing and decision making processes can be guided by analyzing spectrum availability rules hidden in experimental data through data mining on the basis of a large amount of acquired experimental data. By applying the data mining method to the field of wireless communication, the incidence relation of the frequency spectrum data, namely the implicit rule with potential value, can be found out, and the frequency spectrum sensing efficiency can be improved by applying the result obtained by data mining to the frequency spectrum sensing and frequency spectrum decision process, namely, the communication node can more quickly and optimally select the frequency spectrum for communication, so that the communication quality is improved.
Disclosure of Invention
The invention aims to provide an interference avoidance method for updating system spectrum data in real time, predicting a spectrum state, improving the system spectrum utilization rate and enhancing the anti-interference capability of a satellite communication system aiming at the reliable communication requirement of the satellite mobile communication system in a complex electromagnetic environment.
The invention can achieve the aim through the following measures, and the method for avoiding the interference of the user link of the satellite communication system based on the frequency spectrum map mainly comprises five links of data acquisition and preprocessing, frequency spectrum map construction and distribution, frequency spectrum available condition prediction, interference avoidance decision generation and satellite-ground combined frequency spectrum resource allocation, wherein the data acquisition and preprocessing comprises the following steps of: the user terminal sequentially finishes communication signal acquisition, spectrum sensing and interference identification, frames and reports the extracted spectrum map information of the user link downlink channel, the information is transparently forwarded to the gateway station through the satellite transponder, and meanwhile, the satellite also has the functions of spectrum sensing and data preprocessing, acquires the spectrum map information of the user link uplink channel and sends the information to the gateway station; constructing and distributing a frequency spectrum map: the gateway station receives sensing and identification results of different user links, constructs a regional multidimensional spectrum map by combining spot beam numbers, time slots, frequency bands and interference intensity information, and distributes the constructed regional spectrum map to a network management center, and the network management center realizes convergence of different gateway station spectrum maps in a network and constructs a complete spectrum map in a satellite mobile communication system; predicting the available frequency spectrum condition: the network management center establishes a multi-dimensional labeled spectrum database, and predicts the available frequency spectrum condition in the satellite mobile communication system by adopting a frequent pattern mining algorithm; and (3) interference avoidance decision generation: the network management center selects to redistribute the interfered user resources only or redistribute the spectrum resources of the interfered users and the satellites simultaneously based on the prediction result and the user QoS requirement, and transmits the generated interference avoidance strategy to the corresponding gateway station; allocating satellite-ground combined spectrum resources: if the satellite mobile communication system is only interfered by multiple carrier frequencies or narrow bands in the spot wave beam, the gateway station can redistribute the resources of the interfered users through the paging channel, and the working frequency band of the satellite transponder is kept unchanged; if the interference of the whole working frequency band of the spot wave beam is serious, the gateway station reallocates the working frequency band of the satellite transponder through a control signaling, and simultaneously completes resource allocation of an interfered user in a new working frequency band by using a paging channel, so that interference avoidance is realized.
Compared with the prior art, the invention has the following beneficial effects:
and updating the frequency spectrum data in real time. The invention utilizes the multi-dimensional data presentation advantages of the frequency spectrum map, predicts the available frequency spectrum condition by combining a data mining method, directly represents the mapping relation of wave beams, time slots, sub-bands and interference intensity of the satellite mobile communication system by adopting the frequency spectrum map, and provides data support for the prediction analysis of the available frequency spectrum condition by establishing a multi-dimensional labeled frequency spectrum database. The user terminal reports the frequency spectrum map related information of the user link downlink channel by using the access channel, the frequency spectrum map related information is transparently forwarded to the gateway station through the communication satellite transponder, meanwhile, the satellite also has the functions of frequency spectrum sensing and interference detection, the frequency spectrum map information of the user link uplink channel is acquired, the information is sent to the gateway station, the gateway station constructs a multi-dimensional frequency spectrum map of a coverage area, the frequency spectrum map information is transmitted to the network management center, and the network management center gathers the frequency spectrum map information of the whole network to complete the construction and the updating of the system frequency spectrum map.
The spectral state is predictable. The method adopts a frequent pattern mining algorithm to predict the available frequency spectrum situation in the satellite mobile communication system, and firstly, a so-called frequent pattern, namely frequent pattern mining, is found; then, the association between the frequent patterns is found, namely the mining of pattern association rules. By utilizing a data mining technology, the satellite mobile communication system network management center can complete the prediction of the available user frequency spectrum condition of the next time slot or a plurality of time slots in the future, and guide the selection of the idle frequency band of the interfered user according to the prediction result.
The utilization rate of frequency spectrum resources is improved. The invention realizes user interference avoidance by using a QoS-based satellite-ground combined spectrum resource allocation method, namely, according to the prediction result of the spectrum availability condition and based on the QoS requirement of a user, a network management center selects to reallocate the resources of the interfered user or reallocate the resources of the interfered user and the spectrum of a satellite simultaneously, thereby improving the utilization rate of the spectrum resources of the system. If the system spot wave beam is only interfered by multiple carrier frequencies or narrow bands, the resources of the interfered users can be redistributed through a paging channel, and the working frequency band of the satellite transponder is kept unchanged; if the interference of the whole working frequency band of the spot wave beam is serious, the working frequency band of the satellite transponder needs to be re-allocated through a control signaling, and simultaneously, the resource allocation of the interfered user in the new working frequency band is completed by utilizing a paging channel.
The anti-interference capability is enhanced. The method adopts five links of data acquisition and preprocessing, frequency spectrum map construction and distribution, frequency spectrum availability condition prediction, interference avoidance decision generation and satellite-ground combined frequency spectrum resource allocation, fully utilizes the multi-dimensional data presentation advantages of the frequency spectrum map, predicts the frequency spectrum availability condition by establishing the frequency spectrum map associated with multi-dimensional information such as wave beams, time slots, sub-frequency bands, interference intensity and the like of the satellite mobile communication system by using a data mining method, generates an interference strategy based on a prediction result and user QoS (quality of service) requirements, realizes system interference avoidance by satellite-ground combined frequency spectrum resource allocation, enhances the anti-interference capability of the satellite mobile communication system, and provides a brand new thought for the interference avoidance of the satellite mobile communication system.
Drawings
Fig. 1 is a schematic diagram of a spectrum map-based satellite communication system user link interference avoidance framework.
Fig. 2 is a flow chart of multi-dimensional spectrum mapping of a satellite mobile communication system.
Fig. 3 is a spectrum map based satellite communication system user link interference avoidance flow diagram.
The invention is further described with reference to the following figures and examples.
Detailed Description
See fig. 1. According to the invention, five links of data acquisition and preprocessing, frequency spectrum map construction and distribution, frequency spectrum available condition prediction, interference avoidance decision generation and satellite-ground combined frequency spectrum resource allocation are adopted to realize interference avoidance of the satellite mobile communication system, wherein the data acquisition and preprocessing comprises the following steps: the user terminal sequentially finishes communication signal acquisition, spectrum sensing and interference identification, frames and reports the extracted spectrum map information of the user link downlink channel, the information is transparently forwarded to the gateway station through the satellite transponder, and meanwhile, the satellite also has the functions of spectrum sensing and data preprocessing, acquires the spectrum map information of the user link uplink channel and sends the information to the gateway station; constructing and distributing a frequency spectrum map: the gateway station receives sensing and identification results of different user links, constructs a regional multidimensional spectrum map by combining spot beam numbers, time slots, frequency bands and interference intensity information, and distributes the constructed regional spectrum map to a network management center, and the network management center realizes convergence of different gateway station spectrum maps in a network and constructs a complete spectrum map in a satellite mobile communication system; predicting the available frequency spectrum condition: the network management center firstly mines frequent patterns based on a multi-dimensional labeled spectrum database, then finds out the connection among the frequent patterns, mines the rules of pattern connection, and completes the prediction of the available user spectrum condition of the next time slot or a plurality of time slots in the future by a data mining technology; and (3) interference avoidance decision generation: the network management center selects to redistribute the interfered user resources only or redistribute the spectrum resources of the interfered users and the satellites simultaneously based on the prediction result and the user QoS requirement, and transmits the generated interference avoidance strategy to the corresponding gateway station; allocating satellite-ground combined spectrum resources: if the satellite mobile communication system is only interfered by multiple carrier frequencies or narrow bands in the spot wave beam, the gateway station can redistribute the resources of the interfered users through the paging channel, and the working frequency band of the satellite transponder is kept unchanged; if the interference of the whole working frequency band of the spot wave beam is serious, the gateway station reallocates the working frequency band of the satellite transponder through a control signaling, and simultaneously completes resource allocation of an interfered user in a new working frequency band by using a paging channel, so that interference avoidance is realized.
See fig. 2. The satellite mobile communication system completes the construction of the multi-dimensional frequency spectrum map by the following ways: the user terminal UE1 completes signal acquisition, spectrum sensing and interference identification of a downlink channel in sequence, frames and reports the extracted signal characteristics, and transparently forwards the signals to the gateway station through a satellite transponder, and meanwhile, the satellite also has the functions of spectrum sensing and interference detection, acquires spectrum information of an uplink channel of the user UE2, and sends the information to the gateway station; constructing a multi-dimensional frequency spectrum map of a coverage area by a gateway station, and transmitting frequency spectrum map information to a network management center; and the network management center gathers the frequency spectrum map information of the whole network to complete the construction of the frequency spectrum map of the system.
The spectrum map is used as abstract description of a spectrum environment with geographic information, can record and analyze spectrum use conditions of different beams, different time slots and different sub-bands, physical positions of equipment and related historical experience conditions in a complex electromagnetic environment, and is a visualization mode of a spectrum database. The method directly represents the mapping relation of wave beams, time slots, sub-frequency bands and interference intensity of a satellite mobile communication system, and provides data support for prediction and analysis of available frequency spectrum conditions by establishing a multi-dimensional labeled frequency spectrum database. The elements described in the multidimensional frequency spectrum map are divided into four categories, including a geographic feature database, a frequency band service database, a channel feature database and corresponding version information, which are specifically described as follows.
(a) Geographic feature database
The satellite coverage area is marked by taking wave beams/spot wave beams as important geographic features, the coverage area of each wave beam is subdivided into a grid shape, each grid becomes a sub-area, the starting and stopping longitude and latitude of the sub-area are recorded, and the distribution of the frequency spectrum map takes the sub-area as a unit. The geographic characteristic elements comprise beam numbers and sub-region numbers, the sub-regions are used as units for establishing the frequency spectrum map, the smaller the grid is, the more accurate the information is, but the higher the establishment and maintenance cost is.
(b) Frequency band service database
And recording frequency band division, service types and the like in the sub-area.
(c) Channel characteristic database
The channel characteristic database of the satellite mobile communication system comprises channel characteristics such as channel numbers, time slots, interference intensity and the like in a subarea and is used for analyzing and predicting available channels.
(d) Version information
And recording the updating time and the issuing time of the frequency spectrum map so as to assist the distribution of the frequency spectrum map.
The spectrum map contains a large amount of spectrum information, and how to predict the future spectrum availability from the spectrum map relates to the data mining problem.
The following gives the notation and concept in frequent pattern mining:
inputting a matrix: the network management center establishes an input matrix Q for different traffic types (voice, video, etc.),
wherein the content of the first and second substances,aj,m,nrepresenting whether channels are available or not (available is 1, otherwise 0) in the current state of different service types, wherein j represents the service type, m represents the number of the channels, and n represents the number of time slots;
[1] block (2): a sub-matrix of Q;
[2] subarray: a sub-matrix of blocks;
[3] block area: the number of elements contained in a block;
[4] block mode: a block having a block area not less than min _ area, where min _ area is a block mode threshold;
[5] matching: if pattern P and block A are identical, then A is a match for P;
[6] matching number: the number of all matched modes;
[7] an effective mode: the mode with the matching number not less than min _ conf is an effective mode, wherein min _ conf is an effective mode threshold value;
when all valid patterns are identified, if pattern P is identified1And mode P2Are all active modes, and mode P2Having [ P ]1V]Where V is a column vector, pattern P1Is a pattern P2One of the parent blocks of (1).
The spectrum available state transition rate is defined as follows:
R(P1→P2)＝M(P2)/M(P1)
wherein, M (P)1)、M(P2) Respectively represent a pattern P1And mode P2The number of matches of (2). The spectrum availability of the next slot will be at probability R (P)1→P2) Matching the column vector V. Based on the prediction rule, the network management center completes the spectrum availability prediction of the next time slot or a plurality of time slots in the future.
See fig. 3. If the satellite mobile communication system is interfered in the communication process, the user terminal acquires the spectrum information of the downlink signal of the user link in the subregion and reports the spectrum information to the gateway station, and meanwhile, the satellite also has the spectrum sensing and interference detection capabilities, acquires the spectrum information of the uplink channel of the user link in the subregion and reports the spectrum information to the gateway station; the gateway station receives sensing and identification results of different user links, constructs a regional multidimensional spectrum map by combining information such as spot beam numbers, time slots, frequency bands, interference intensity and the like, and distributes the constructed regional spectrum map to a network management center; the network management center constructs a complete spectrum map of the system, predicts the available situation of the spectrum in the satellite mobile communication system by adopting a frequent pattern mining algorithm, and determines a deployment scheme based on the prediction result and the requirement of a user QoS (quality of service); the network management center issues the interference avoidance allocation scheme to the corresponding gateway station, the gateway station generates an allocation instruction and transmits the allocation instruction to the satellite and the user terminal, the satellite and the user terminal feed back an allocation instruction receiving response, the gateway station returns reconfigures parameters to the satellite and the user terminal according to the allocation instruction, and system interference avoidance is completed.
According to the prediction result of the available frequency spectrum condition of the network management center, based on the QoS requirement of users, the allocation scheme of the network management center is mainly divided into two types, namely, the resources of interfered users are reallocated, or the frequency spectrum resources of the interfered users and the frequency spectrum resources of the satellite are reallocated at the same time. If the system spot wave beam is only interfered by multiple carrier frequencies or narrow bands, the resources of the interfered users can be redistributed through a paging channel, and the working frequency band of the satellite transponder is kept unchanged; if the interference of the whole working frequency band of the spot wave beam is serious, the working frequency band of the satellite transponder needs to be re-allocated through a control signaling, and simultaneously, the resource allocation of the interfered user in the new working frequency band is completed by utilizing a paging channel.
(a) User spectrum resource reallocation
Firstly, a gateway station generates a control instruction through a paging channel, wherein the control instruction comprises the reallocation of a user terminal service frequency band, and a satellite forwards the control instruction to a user terminal through a repeater; the user terminal analyzes and responds to the paging, adjusts communication parameters, achieves ground interference avoidance, and finally achieves normal communication between users.
(b) Simultaneous reallocation of user and satellite spectrum resources
Firstly, a gateway station generates an on-satellite working state control instruction, and sends the control instruction to a satellite through a special independent channel with high security level; the satellite returns the confirmation information and analyzes the instruction to complete the on-satellite work parameter reconfiguration; the gateway station generates a terminal communication state control instruction through a paging channel, wherein the control instruction comprises the reallocation of a user terminal service frequency band and a time slot; the satellite transmits the control command to the user terminal through the transponder, the user terminal responds to paging, communication parameters are adjusted, ground interference avoidance is completed, and normal communication between users is finally achieved.
While the foregoing is directed to the preferred embodiment of a method for synchronized transmission of data over fiber optic links, it is to be understood that the invention is not limited to the form disclosed herein, but is intended to be open ended and that the invention is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A satellite communication system user link interference avoiding method based on a frequency spectrum map is characterized by comprising the following steps: data acquisition and preprocessing: the user terminal sequentially finishes the collection, spectrum sensing and interference identification of communication signals, frames and reports the extracted spectrum map information of the downlink channel of the user link, transparently forwards the information to the gateway station through the satellite transponder, acquires the spectrum map information of the uplink channel of the user link and sends the information to the gateway station; constructing and distributing a frequency spectrum map: the gateway station receives sensing and identification results of different user links, constructs a regional multidimensional spectrum map by combining spot beam numbers, time slots, frequency bands and interference intensity information, and distributes the constructed regional spectrum map to a network management center to realize convergence of different gateway station spectrum maps in a network and construct a complete spectrum map in a satellite mobile communication system; predicting the available frequency spectrum condition: the network management center establishes a multi-dimensional labeled spectrum database, and predicts the available frequency spectrum condition in the satellite mobile communication system by adopting a frequent pattern mining algorithm; and (3) interference avoidance decision generation: the network management center selects to redistribute the interfered user resources only or redistribute the spectrum resources of the interfered users and the satellites simultaneously based on the prediction result and the user QoS requirement, and transmits the generated interference avoidance strategy to the corresponding gateway station; allocating satellite-ground combined spectrum resources: if the satellite mobile communication system is only interfered by multiple carrier frequencies or narrow bands in the spot wave beam, the gateway station redistributes the resources of the interfered users through the paging channel, and the working frequency band of the satellite transponder is kept unchanged; if the interference of the whole working frequency band of the spot wave beam is serious, the gateway station reallocates the working frequency band of the satellite transponder through a control signaling, and simultaneously completes resource allocation of an interfered user in a new working frequency band by using a paging channel, so that interference avoidance is realized.
2. The spectrum map based satellite communication system user link interference avoidance method of claim 1, wherein: the user terminal UE1 completes signal acquisition, spectrum sensing and interference identification of a downlink channel in sequence, frames and reports the extracted signal characteristics, and transparently forwards the signals to the gateway station through a satellite transponder, and meanwhile, the satellite also has the functions of spectrum sensing and interference detection, acquires spectrum information of an uplink channel of the user UE2, and sends the information to the gateway station; constructing a multi-dimensional frequency spectrum map of a coverage area by a gateway station, and transmitting frequency spectrum map information to a network management center; the network management center gathers the spectrum map information of the whole network to complete the construction of the spectrum map of the system.
3. The spectrum map based satellite communication system user link interference avoidance method of claim 2, wherein: the elements described by the multi-dimensional frequency spectrum map are divided into four types, including a geographic characteristic database, a frequency band service database, a channel characteristic database and corresponding version information; the geographic characteristic elements comprise beam numbers and sub-area numbers, and a frequency spectrum map is established by taking the sub-areas as units; the frequency band service database records frequency band division and service types in the sub-region; the channel characteristic database comprises channel numbers, time slots and channel characteristics of interference intensity in the subareas and is used for analyzing and predicting available channels; the version information records the updating time and the issuing time of the frequency spectrum map so as to assist the distribution of the frequency spectrum map.
4. The spectrum map based satellite communication system user link interference avoidance method of claim 1, wherein: when the frequent pattern mining algorithm predicts the available frequency spectrum situation in the satellite mobile communication system, the network management center firstly finds the frequent patterns, then finds the connection among the frequent patterns, mines the frequent pattern connection rules, uses the data mining technology to complete the prediction of the available frequency spectrum situation of the user in the next time slot or a plurality of time slots in the future, and guides the selection of the idle frequency band of the interfered user according to the prediction result.
5. The spectrum map based satellite communication system user link interference avoidance method of claim 4, wherein: the network management center establishes an input matrix Q aiming at different service types,
wherein, aj,m,nRepresenting whether channels are available or not in the current state of different service types, the available number is 1, otherwise, the available number is 0, j represents the service type, m represents the number of the channels, and n represents the number of time slots.
6. The spectrum map based satellite communication system user link interference avoidance method of claim 4, wherein: if the pattern P1And mode P2All the modes are system effective modes, and the state transition rate for the satellite mobile communication system frequency spectrum is defined as follows: r (P)1→P2)＝M(P2)/M(P1) The spectrum availability of the next slot is represented by the probability R (P)1→P2) Matching with the column vector V, based on the prediction rule, the network management center completes the frequency of the next time slot or a plurality of time slots in the futureThe spectra can be predicted using the conditions, where M (P)1)、M(P2) Respectively represent a pattern P1And mode P2The number of matches of (2).
7. The spectrum map based satellite communication system user link interference avoidance method of claim 1, wherein: the network management center issues the interference avoidance allocation scheme to the corresponding gateway station, the gateway station generates an allocation instruction and transmits the allocation instruction to the satellite and the user terminal, the satellite and the user terminal feed back an allocation instruction receiving response, the gateway station returns a re-confirmation message to be sent to the satellite and the user terminal, and the satellite and the user terminal perform parameter reconfiguration according to the allocation instruction to complete system interference avoidance.
8. The spectrum map based satellite communication system user link interference avoidance method of claim 1, wherein: in the reallocation of user spectrum resources, a gateway station generates a control instruction through a paging channel, wherein the control instruction comprises the reallocation of a user terminal service frequency band, and a satellite forwards the control instruction to a user terminal through a repeater; the user terminal analyzes and responds to the paging, adjusts communication parameters, achieves ground interference avoidance, and finally achieves normal communication between users.
9. The spectrum map based satellite communication system user link interference avoidance method of claim 1, wherein: in the process of simultaneously reallocating the user and the satellite frequency spectrum resources, the gateway station generates an on-satellite working state control instruction and sends the control instruction to the satellite through an independent channel with high security level; the satellite returns the confirmation information and analyzes the instruction to complete the on-satellite work parameter reconfiguration; the gateway station generates a terminal communication state control instruction through a paging channel, wherein the control instruction comprises the reallocation of a user terminal service frequency band and a time slot; the satellite transmits the control command to the user terminal through the transponder, the user terminal responds to paging, communication parameters are adjusted, ground interference avoidance is completed, and normal communication between users is finally achieved.
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| CN110519723B (en) * | 2019-08-09 | 2023-01-31 | 东南大学 | Communication method for satellite and terminal equipment in duplex multi-band |
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| CN113131986B (en) * | 2019-12-31 | 2023-04-25 | 大唐移动通信设备有限公司 | Satellite wave beam bias processing method, device and medium |
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| CN112039575B (en) * | 2020-08-04 | 2022-07-08 | 航天科工空间工程发展有限公司 | Method for realizing compatible coexistence of newly-built and existing NGSO constellation communication systems |
| CN112752311B (en) * | 2020-12-18 | 2022-09-06 | 南京航空航天大学 | Intelligent dynamic spectrum anti-interference system and method combined with network link level |
| CN112867014B (en) * | 2021-01-12 | 2022-06-14 | 中国人民解放军国防科技大学 | Channel state detection method based on spectrum map data distribution |
| CN112653529A (en) * | 2021-01-13 | 2021-04-13 | 北京羽寻智能科技有限公司 | Analysis method of radio signal interference pattern |
| WO2022183477A1 (en) * | 2021-03-05 | 2022-09-09 | 北京小米移动软件有限公司 | Interference processing method and apapratus, communication device and storage medium |
| CN114050856B (en) * | 2021-09-27 | 2024-02-20 | 南京邮电大学 | Satellite spectrum occupation state fitting and predicting method |
| US11956166B2 (en) | 2021-12-22 | 2024-04-09 | T-Mobile Usa, Inc. | Refarming telecommunications spectrum blocks in a telecommunications network |
| CN114567350B (en) * | 2022-02-21 | 2023-08-22 | 中国电子科技集团公司第十研究所 | Cognitive interference protection system of aerospace measurement and control system |
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