CN109257774A - A kind of communication means and system for supporting that real time spectrum perceives and interference is evaded - Google Patents
A kind of communication means and system for supporting that real time spectrum perceives and interference is evaded Download PDFInfo
- Publication number
- CN109257774A CN109257774A CN201811028633.8A CN201811028633A CN109257774A CN 109257774 A CN109257774 A CN 109257774A CN 201811028633 A CN201811028633 A CN 201811028633A CN 109257774 A CN109257774 A CN 109257774A
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- CN
- China
- Prior art keywords
- base station
- transit equipment
- interference
- location information
- access range
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of communication means and system for supporting that real time spectrum perceives and interference is evaded comprising the steps of: A, the geographical location information for receiving the transit equipment that transit equipment is sent；B, according to the geographical location information of the position of base station and access range and the transit equipment, determine whether the transit equipment enters the access range of base station；C, it detects that the transit equipment enters the access range of the base station, then instructs the base station to stop spectrum scan, provide service for the transit equipment；Using spectrum scan method and system provided by the embodiment of the present invention, base station may be implemented in idle periods and carry out spectrum scan, when there is car-mounted terminal to access the base station, which stops spectrum scan according to the notice of network management system, provides service for the transit equipment.
Description
Technical field
The present invention relates to field of communication technology, specifically a kind of communication means for supporting real time spectrum perception and interference to evade
And system.
Background technique
Base station is especially distributed across the base station of line of high-speed railway, during the free time, will do it spectrum scan, so as to true
Whether current frequency range is recognized by other signal interferences.Wherein, so-called idle periods refer to that the terminals such as no any car-mounted terminal are set
The period of standby access.In idle periods, base station has time to complete in real time or dynamic interference scans.Using the idle periods,
The available current spectral interference situation in base station, and uplink sub-carrier deduction, the deduction side are implemented according to interference scanning result
Case will pass to the terminal device that will be accessed, such as car-mounted terminal by downlink in the form of broadcast.
If it is determined that there is frequency range to be interfered, then it will start new frequency range to be communicated with car-mounted terminal, i.e., vehicle-mounted
Terminal accesses heel row and removes noisy frequency range.
General car-mounted terminal can all have GPS (Global Positioning System, GPS),
Train in the process of running, can be according to the location information and GIS-Geographic Information System (Geographic of GPS determination
Information System, GIS) determine the base station that may nearby access.And transmit these information to network management system.Network management
System instructs the frequency spectrum perception state of corresponding base station by the adjustment of this information, to make conversion before car-mounted terminal reaches,
Access and data transport service are provided for car-mounted terminal.
Therefore, the scanning of base station is preferably carried out in idle periods, if be also scanned after terminal device access,
It just will affect the business of terminal device, or even will cause terminal device can not normally access.
Next generation mobile communication technology generallys use orthogonal frequency division multiple access (Orthogonal Frequency Division
Multiple Access, OFDMA) technology, and the communication system of OFDMA technology is used to be easy by the narrowband in crowded frequency range
It interferes (such as anolog TV signals), the deterioration of performance may be brought under low signal-to-noise ratio operating condition.In order to inhibit these dry
It disturbs, guarantees communication quality, there are corresponding subcarriers on the narrowband slice of interference to be deducted.Therefore base station needs to perceive wherein
To confirm that there is the subcarrier frequency range of interference in the frequency spectrum near heart frequency point.
Under normal conditions, it for the base station along high-speed rail, perceives the frequency spectrum near its center frequency point and generallys use energy inspection
The method of survey.The method of so-called energy measuring is a kind of common frequency spectrum sensing method, belongs to the noncoherent detection of signal.It adopts
With the method, it is only necessary to which the energy for knowing detected in-band signal can be detected out the disturbed condition of the frequency range.In order to measure
The energy for receiving signal is needed to carry out square operation to the output signal of bandpass filter, and is accumulated within the observation period
Point, the output of integrator is compared with fixed door limit value, obtains testing result.
Wherein, the flow chart of energy measuring is as shown in Figure 1, wherein by analog and digital circuit conversion, (A/D turns signal X (n)
Change), after analog signal X (n) is converted to digital signal, accumulated using multiple spot Fast Fourier Transform (FFT), and in T time
Point, and obtained result is subjected to energy measuring, the energy results that will test make decisions thresholding and compare, if exceeding thresholding
Value, then it is assumed that interference is received, if without departing from threshold value, then it is assumed that be not interfered.
Wherein, base station is scanned the frequency spectrum near the base station center frequency point in idle periods, obtains interference result.By
In the particularity of high-speed rail operation, base station can have longer idle periods.In idle periods, base station having time completes real-time or dynamic
Interference scanning.Using the idle periods, available current spectral interference situation, and uplink is implemented according to interference scanning result
Subcarrier deducts, which will pass to the terminal device that will be accessed by downlink in the form of broadcast.
Base station when carrying out disturbance ecology by its media access control layer (Media Access Control, MAC), leads to
Several carrier scanning values are often subjected to energy ordering, several groups are divided into according to the size of energy, wherein energy is one group the smallest
For determining that bottom is made an uproar size, maximum one group of energy is determined as may interfere with domain of the existence.Simultaneously according to field testing as a result,
The signal for being higher by some threshold value that will make an uproar the bottom of than is regarded as interfering.Interference scanning only considers the scanning of base station uplink interference, according to scanning
As a result carrier wave deduction is carried out to uplink and downlink simultaneously.
Based on described above, the invention proposes a kind of spectrum sensing schemes based on GIS information, sweep to traditional frequency spectrum
The technology of retouching improves.GIS GIS-Geographic Information System is based on geospatial database, in the support of computer software and hardware
Under, with the theory of system engineering and information science, the geodata of scientific management and comprehensive analysis with spatial connotation, to mention
For the technological system of the information needed such as management, decision.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of communication means for supporting that real time spectrum perceives and interference is evaded
And system, to solve the problems, such as to mention in background technique.
To achieve the above object, the invention provides the following technical scheme:
A kind of communication means for supporting that real time spectrum perceives and interference is evaded comprising the steps of:
A, the geographical location information for the transit equipment that transit equipment is sent is received；
B, according to the geographical location information of the position of base station and access range and the transit equipment, the friendship is determined
Whether logical equipment enters the access range of base station；
C, it detects that the transit equipment enters the access range of the base station, then instructs the base station to stop frequency spectrum and sweep
It retouches, provides service for the transit equipment.
A kind of communication system for supporting that real time spectrum perceives and interference is evaded: including network management system: being set for receiving traffic
The geographical location information for the transit equipment that preparation is sent；According to the ground of the position of base station and access range and the transit equipment
Location information is managed, determines whether the transit equipment enters the access range of the base station；If the transit equipment enters institute
The access range for stating base station then instructs the base station to stop spectrum scan, provides service for the transit equipment；It further include base
Stand: the geographical location information sent for receiving the transit equipment receives the instruction that gateway is sent, and stops frequency spectrum and sweeps
It retouches, provides service for the transit equipment.
As a preferred solution of the present invention: position and the access for configuring the base station are equipped with inside the network management system
The database of range.
As a preferred solution of the present invention: the database is GIS data server.
As a preferred solution of the present invention: being wirelessly connected between the network management system and base station.
Compared with prior art, the beneficial effects of the present invention are: using spectrum scan side provided by the embodiment of the present invention
Method and system, may be implemented base station idle periods carry out spectrum scan, when there is car-mounted terminal to access the base station, the base station according to
The notice of network management system stops spectrum scan, provides service for the transit equipment.
Detailed description of the invention
Fig. 1 is the schematic diagram of energy measuring in the embodiment of the present invention；
Fig. 2 is that real time spectrum is supported to perceive and interfere system tray applied by the communication means evaded in the embodiment of the present invention
Composition；
Fig. 3 is the schematic diagram that base station state is calculated in the embodiment of the present invention；
Fig. 4 is base station state transition diagram in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, embodiment 1: a kind of communication means for supporting that real time spectrum perceives and interference is evaded includes following step
It is rapid:
A, the geographical location information for the transit equipment that network management system receiving terminal apparatus is sent；
B, network management system is according to the position of base station and the geographical location information of access range and the transit equipment, really
Whether the fixed transit equipment enters the access range of base station；
If C, the transit equipment enters the access range of the base station, network management system instructs the base station to stop frequency
Spectrum scanning, provides service for the transit equipment.
Embodiment 2: in embodiments of the present invention,
If the transit equipment does not enter into the access range of base station, network management system instructs the base station to start frequency spectrum
Scanning.
Wherein, network management system instruction base station executes different orders, can be network management system and sends request message, should
Different parameters is carried in message, and then executes different orders.
Embodiment 3: in this hair embodiment,
Network management system receives the base station letter of the geographical location information that the transit equipment is sent and transit equipment access
Breath establishes the position of the base station and the database of access range；Or configured in network management system the base station position and
Access the database of range.
Wherein, in embodiments of the present invention, which can be train, as high-speed rail, motor-car, Conventional trains, subway,
Light rail etc. is also possible to steamer, car etc..
In embodiments of the present invention, car-mounted terminal can also become terminal or terminal device, be integrated in traffic and set
Standby upper communication equipment, can report the geographical location information of the transit equipment and the information of institute's access base station, such as to base station
Access so base station, since where access the base station etc..
Wherein, network management system can be an independent equipment in network, can also if system is just done on the backstage of operator
To be held a concurrent post by equipment such as gateways.
Since high-speed railway can substantially be considered as linear network, a base station coverage area can be considered one section of straight line,
Handoff boundary can be considered two points, specific as shown in Figure 3:
Assuming that the geographical position coordinates of two switching point of some base station in GIS database are M and N, base station is by the free time
The conversion time of phase to preparation phase is t1, the current speed of service of train is v, and the current position of train is Q, train GPS letter
Ceasing the time interval reported is t2,
Consider the environment of linear running, the critical trigger condition of base station state conversion are as follows:
And
WhenAndWhen, base station is in idle periods, carries out spectrum scan；
WhenAndWhen, base station stops spectrum scan, into preparation
Phase；
WhenWhen, car-mounted terminal is located in base station service area, and base station provides business service for it, wherein base station
State transition diagram it is as shown in Figure 4.
The there is provided detailed process of the embodiment of the present invention includes:
Enter idle periods after S1, base station starting, starts uplink spectrum scanning work, the maximum frequency of scanning can be every frame
The scan frequency that once also can according to need adjustment base station is carried out, the result of scanning is broadcasted downwards in the form of map.
S2, car-mounted terminal are when with train operation, the location information of real-time report train, real such as in the form of private message
When report GPS information, meanwhile, train also can by and the geographical location information and corresponding base station that switch are reported to network management system every time
System forms GIS database.The geographical location information that train switches every time refers to that the car-mounted terminal on train is cut from a base station
When changing to another base station, the geographical location information of train.
After S3, network management system receive the geographical location information of current train, calculated according to GIS database and above-mentioned trigger condition
Method determines the state of each base station；
Such as: the geographical location information reported according to train determines that base station 2 needs to start for the car-mounted terminal clothes on the train
Business, base station 1 will stop as the car-mounted terminal service etc. on the train.
S4, it determines whether the base station needs to carry out state conversion according to calculated result, and sends corresponding instruction to base station；
Such as: the geographical location information reported according to train determines that base station 2 needs to start as the car-mounted terminal service on the train, base station 1
Stop as the car-mounted terminal service on the train, enters in the coverage area of base station 3 without train, then can be sent out to base station 1
The message for sending state to convert, allowing base station 1 to stop is the train service, starts to scan, and sends to base station 2 and stops scanning, into pre-
Standby phase, preparation start to provide service for car-mounted terminal, send the message that state is kept to base station 3, base station 3 keeps idle
Phase continues spectrum scan.
Wherein, which type of instruction is network management system should send to base station, be referred to above-mentioned base station state conversion
Critical trigger condition determines the current state in base station according to the calculation, and sends and instruct to base station, while also with reference to base
It stands the state being at present.Such as by calculating, which will provide service for a certain car-mounted terminal, but the base station is being
An other car-mounted terminal provides service, then the base station sends the finger that state is kept there is no need to carry out state conversion, network management system
Enable, etc..
Wherein, network management can send request message to base station, to carrying in request message with specific parameter, such as " stop "
It indicates to stop scanning, " start " indicates state conversion, and " null " indicates that state is kept, and can also be indicated to stop sweeping with " 0 "
It retouches, " 1 " indicates state conversion, " sky " indicates that state is kept.It can also be carried out according to the hobby and corresponding rule of itself
Setting, the embodiment of the present invention is with no restrictions.
S5, base station enter after being instructed such as base station and prepare according to the working condition of the instruction adjustment oneself of network management system
The work phase, then base station stops spectrum scan, and the scanning result of last time is kept to broadcast downwards in the form of map；Subsequent base stations
It receives after providing service for terminal device, base station provides service for the terminal device, and train leaves the region of base station covering
Afterwards, the instruction for starting scanning that base station will receive network management system transmission restarts to sweep then base station enters idle periods
It retouches, and scanning result is broadcasted downwards in the form of map.
Embodiment 4: in the specific embodiment of the invention, it is assumed that under certain horizontal linear rail environment, certain base station A is in GIS
Two handoff boundary coordinates of database are M (- 1500,0), and N (1500,0) (unit is rice), the current speed of service of train is
V=360km/h=100m/s, base station state conversion time are t1=0.5 second, the interval of reporting of user GPS information was t2=1 second.
When the position of user is at P (2000,0),AndTherefore base station A is now in idle periods, executes spectrum scan.
When the position of user is at Q (1600,0),AndNetwork management system issues instruction at this time, and base station A stops spectrum scan, into standard
The standby work phase.
When car-mounted terminal leaves current base station, and network management system will not have the instruction information of car-mounted terminal arrival,
Base station A reenters idle periods.
Using spectrum scan method provided in an embodiment of the present invention, guarantee that the frequency spectrum of base station is being normally carried out for scanning,
The service provided for terminal device is provided.
The embodiment of the invention provides a kind of spectrum scan systems, including network management system and base station, in which:
The network management system, the geographical location information for the transit equipment that receiving terminal apparatus is sent；According to base station
The geographical location information of position and access range and the transit equipment, determines whether the transit equipment enters the base
The access range stood；If the transit equipment enters the access range of the base station, instructs the base station to stop frequency spectrum and sweep
It retouches, provides service for the transit equipment；
The base station, the geographical location information sent for receiving the transit equipment receive the gateway and send
Instruction, stop spectrum scan, provide service for the transit equipment.
Spectrum scan system provided in an embodiment of the present invention, further includes:
The network management system, if being also used to the access range that the transit equipment does not enter into base station, described in instruction
Base station starts spectrum scan；
The base station is also used to receive the instruction that the network management system is sent, and starts to carry out spectrum scan.
Spectrum scan system provided by the embodiment of the present invention, further includes:
The network management system, the geographical location information and the transit equipment for being also used to receive the transit equipment transmission connect
The base station information entered establishes the position of the base station and the database of access range；Or the network management system, it is also used to configure
The position of the base station and the database of access range.
Spectrum scan system provided by the embodiment of the present invention, specific embodiment are referred in embodiment of the method
Description.In this spectrum scan system, base station can carry out spectrum scan in idle periods can stop when there is terminal access
Scanning, provides service for terminal.
Claims (5)
1. a kind of communication means for supporting that real time spectrum perceives and interference is evaded, which is characterized in that comprise the steps of:
A, the geographical location information for the transit equipment that transit equipment is sent is received；
B, according to the geographical location information of the position of base station and access range and the transit equipment, determine that the traffic is set
The standby access range for whether entering base station；
C, it detects that the transit equipment enters the access range of the base station, then instructs the base station to stop spectrum scan, be
The transit equipment provides service.
2. a kind of communication system for supporting that real time spectrum perceives and interference is evaded, which is characterized in that including network management system: for connecing
Receive the geographical location information for the transit equipment that transit equipment is sent；According to the position of base station and access range and the traffic
The geographical location information of equipment, determines whether the transit equipment enters the access range of the base station；If the traffic is set
The standby access range for entering the base station, then instruct the base station to stop spectrum scan, provide service for the transit equipment；Also
Including base station: the geographical location information sent for receiving the transit equipment receives the instruction that gateway is sent, and stops frequency
Spectrum scanning, provides service for the transit equipment.
3. a kind of communication system for supporting that real time spectrum perceives and interference is evaded according to claim 2, which is characterized in that
The position for configuring the base station and the database of access range are equipped with inside the network management system.
4. a kind of communication system for supporting that real time spectrum perceives and interference is evaded according to claim 3, which is characterized in that
The database is GIS data server.
5. special according to a kind of any communication system for supporting that real time spectrum perceives and interference is evaded of claim 2-4
Sign is, is wirelessly connected between the network management system and base station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811028633.8A CN109257774A (en) | 2018-09-04 | 2018-09-04 | A kind of communication means and system for supporting that real time spectrum perceives and interference is evaded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811028633.8A CN109257774A (en) | 2018-09-04 | 2018-09-04 | A kind of communication means and system for supporting that real time spectrum perceives and interference is evaded |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109257774A true CN109257774A (en) | 2019-01-22 |
Family
ID=65046822
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811028633.8A Withdrawn CN109257774A (en) | 2018-09-04 | 2018-09-04 | A kind of communication means and system for supporting that real time spectrum perceives and interference is evaded |
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| Country | Link |
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| CN (1) | CN109257774A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110012514A (en) * | 2019-03-29 | 2019-07-12 | 北京锦鸿希电信息技术股份有限公司 | Point-to-train communication optimization method and system |
| CN112838890A (en) * | 2021-02-07 | 2021-05-25 | 航天科工空间工程发展有限公司 | Satellite communication system with cooperative spectrum sensing and communication |
-
2018
- 2018-09-04 CN CN201811028633.8A patent/CN109257774A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110012514A (en) * | 2019-03-29 | 2019-07-12 | 北京锦鸿希电信息技术股份有限公司 | Point-to-train communication optimization method and system |
| CN112838890A (en) * | 2021-02-07 | 2021-05-25 | 航天科工空间工程发展有限公司 | Satellite communication system with cooperative spectrum sensing and communication |
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Application publication date: 20190122 |