CN104009809B - A kind of cognitive radio system subframe method of adjustment and equipment - Google Patents
A kind of cognitive radio system subframe method of adjustment and equipment Download PDFInfo
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- CN104009809B CN104009809B CN201310061307.8A CN201310061307A CN104009809B CN 104009809 B CN104009809 B CN 104009809B CN 201310061307 A CN201310061307 A CN 201310061307A CN 104009809 B CN104009809 B CN 104009809B
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Abstract
The invention discloses a kind of cognitive radio system subframe method of adjustment and equipment.The method includes: CR system equipment obtains the signal emission parameter of authoring system；Described CR system equipment is according to the signal emission parameter of authoring system, judge that whether the signal period length of described authoring system be the integral multiple of CR system subframe length, and whether CR system exists time width not less than the non-useful signal of signal emission duration length in the described authoring system signal period；The most described CR system equipment adjusts the initial time of subframe, the part described non-useful signal of carrying disturbed by described authoring system in making CR system subframe；Wherein, non-useful signal refers to that CR system receiving terminal does not carries out the non-data part detected.Use the present invention can reduce the signal disturbing of the authoring system suffered by cognitive radio system.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of cognitive radio system subframe method of adjustment and
Equipment.
Background technology
Radio communication frequency spectrum is the natural resources of a kind of preciousness, along with the very fast development of wireless communication technology,
The poor problem of frequency spectrum resource is day by day serious, the present situation nervous in order to alleviate frequency spectrum resource, relevant department and
Wireless communication spectrum is monitored and has been studied by mechanism, finds that some frequency range (such as TV band) is mostly
Not using in the number time or do not use in most of regions, some frequency range then occurs in that multisystem
There is unbalanced phenomenon in the use of the situation that multi-user competes simultaneously, i.e. frequency spectrum resource.Cognitive radio
The concept of (CR, Cognitive Radio) produces the most under this background, and CR technology can improve
The frequency spectrum service efficiency of wireless communication system and motility, its basic thought is: obtain the frequency spectrum of authoring system
Service condition, and accordingly adjust CR system emission parameter, it is ensured that authoring system not by harmful interference,
Ensure the performance of CR system self simultaneously.
The scene that the conventional operation mode of CR system is persistently launched for authoring system time domain at present is (such as broadcast
Television system) design, working method is: determines blank frequency spectrum (the untapped frequency spectrum of authoring system), connects
Enter blank frequency spectrum work；When CR system discovery authoring system is at currently used blank frequency spectrum (source work frequency
Point) on when reappearing, CR system exits currently used blank frequency spectrum, and whole CR system is cut
Change to the process of other the upper recovery business of blank frequency spectrum (target operation frequency), when there is not blank frequency spectrum
Time, CR system stalls.
In actual application, on the one hand, the signal transmission power of some authoring system is very big (such as radar emission merit
Rate can reach hundreds of kilowatt), for this type of authoring system, in the neighbouring geographic area of authoring system transmitter,
Not only the current emission band of authoring system transmitter is disturbed, and its adjacent frequency or secondary adjacent frequency or even whole frequency band all can
Strong jamming by authoring system transmitter signal；On the other hand, the transmitting signal of these authoring systems time
Territory is discontinuous, and periodic transmission (if radar system signal is time domain impulsive signals), CR system is often
Authoring system signal in the individual authoring system signal period is interior duration of transmitting, deposits between meeting and authoring system
Interfering.
Traditional CR working method is the Scenario Design persistently launched for authoring system time domain, does not examine
Consider the feature that authoring system is launched at time domain periodic, therefore when authoring system transmitting power is the biggest, CR
System cannot find blank frequency spectrum to work in the neighbouring geographic area of authoring system transmitter, can only stop fortune
Battalion, have impact on the Consumer's Experience of CR system.
Summary of the invention
Embodiments provide a kind of cognitive radio system subframe method of adjustment and equipment, in order to reduce
The signal disturbing of the authoring system suffered by cognitive radio system.
The cognitive radio system CR subframe method of adjustment that the embodiment of the present invention provides, including:
CR system equipment obtains the signal emission parameter of authoring system；
Described CR system equipment is according to the signal emission parameter of authoring system, it is judged that the letter of described authoring system
Whether number Cycle Length is the integral multiple of CR system subframe length, and whether CR system exists time width
Not less than the non-useful signal of signal emission duration length in the described authoring system signal period；If so,
The most described CR system equipment adjusts the initial time of subframe, in making CR system subframe by described mandate is
The part of system interference carries described non-useful signal；Wherein, non-useful signal refers to CR system receiving terminal not
Carry out the non-data part detected.
The CR system equipment that the embodiment of the present invention provides, including:
Acquisition module, for obtaining the signal emission parameter of authoring system；
Judge module, for the signal emission parameter according to authoring system, it is judged that the signal of described authoring system
Whether Cycle Length is the integral multiple of CR system subframe length, and whether CR system exists time width not
Less than the non-useful signal of signal emission duration length in the described authoring system signal period；Wherein, non-
Useful signal refers to that CR system receiving terminal does not carries out the non-data part detected；
Adjusting module, for when described judge module is judged as YES, adjusts the initial time of subframe, makes
The part disturbed by described authoring system in CR system subframe carries described non-useful signal.
The above embodiment of the present invention, obtains the signal emission parameter of authoring system, and root by CR system
According to the initial time of this parameter adjustment CR system subframe, disturbed by authoring system in making CR system subframe
Part will carry non-useful signal, thus avoid CR system to receive within authoring system launch time as far as possible
Useful signal so that the useful signal of CR system can avoid the harmful interference of authoring system.
Accompanying drawing explanation
The interference handling process schematic diagram of the CR system that Fig. 1 provides for the embodiment of the present invention；
Fig. 2 is signal and the signal parameter schematic diagram of the authoring system in the embodiment of the present invention；
The structural representation of the CR system equipment that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
CR system (such as LTE(Long Term Evolution, Long Term Evolution)-CR system) typically can insert
Enter the non-useful signals such as prefix, suffix and protection interval, when authoring system signal transmission time is in CR system
During the non-useful signal emission durations such as system prefix, suffix and protection interval, due to CR system receiving terminal
Typically do not detect non-useful signal, thus without affecting CR system to the reception of useful signal and detection.
Such as, authoring system is radar system, and CR system is TD(Time Division, time domain)-LTE-CR
System；Wherein, the subframe lengths of TD-LTE is 1ms, comprises 2 time slots, a son in a subframe
12 or 14 OFDM(Orthogonal Frequency Division Multiplexing are comprised, just in frame
Hand over frequency division multiplexing) or SC-FDMA(Single-carrier Frequency-Division Multiple Access,
Single-carrier frequency division multiple access) symbol.Radar transmission power can reach hundreds of kilowatt, causes around radar transmitter
In sizable geographic area, present band or adjacent frequency or secondary adjacent frequency or even whole frequency band are disturbed；And radar letter
Number being time domain impulsive signals, time domain is discontinuous, and the time domain cycle is generally 0.05 ~ 20ms, and typical value exists
About 0.5ms ~ 2ms, pulse width is divided into long pulse to rush with short pulse, and long pulse is usually no more than tens μ s,
Short pulse rushes then close to 1 μ about s, it can be seen that: the cycle of radar signal is close to the subframe of TD-LTE
Length, long pulse may interfere with about an OFDM or SC-FDMA symbol, and short pulse punching is then disturbed
/ the tens of one OFDM or SC-FDMA symbol, accord with much smaller than OFDM or SC-FDMA
Number CP(Cyclic Prefix, Cyclic Prefix) part.And when the signal period of authoring system is CR
During the integral multiple of system subframe length, each subframe of CR system may not be disturbed by authoring system, if
There is authoring system interference signal in CR system subframe, then the part being interfered in subframe (includes doing
The original position disturbed and persistent period) it is identical for all subframes being interfered.
The feature launched at time domain periodic based on above authoring system, and the signal characteristic of CR system,
The embodiment of the present invention proposes a kind of cognitive radio system subframe Adjusted Option, is awarded in making CR system
The part of power system interference will carry non-useful signal, thus avoid CR system to launch at authoring system as far as possible
Useful signal is received so that the useful signal of CR system can avoid the harmful dry of authoring system in time
Disturb, it is ensured that the Consumer's Experience of CR system.
Technical solution of the present invention is applicable for use with the LTE system of CR technology, TD-SCDMA(Time
Division-Synchronous Code Division Multiple Access, TD SDMA) system,
GSM(Global System of Mobile communication, global system for mobile communications), WCDMA
(Wideband Code Division Multiple Access, WCDMA), CDMA-2000 with
WRAN(Wireless Regional Area Network, radio area network) etc. wireless communication system, with
And the evolution system that system above is following.
Below in conjunction with the accompanying drawings the embodiment of the present invention is described in detail.
See Fig. 1, for the interference handling process schematic diagram of the CR system that the embodiment of the present invention provides.This stream
In journey using the base station equipment in CR system as the executive agent of this flow process as a example by describe, the execution of this flow process
Main body can also is that other is capable of subframe initial time and adjusts the network equipment of function, such as RNC
(Radio Network Controller, radio network controller).As it can be seen, this flow process can include following
Step 101 ~ 104:
The base station of step 101:CR system obtains the signal emission parameter of authoring system.
Concrete, the signal emission parameter of authoring system includes but not limited to: the signal period of authoring system is long
Degree InterferPeriod, signal emission duration length in each signal period
InterferDurationPerPeriod, and offset relative to the transmitting time started of CR system
InterferStartTimeOffset, also can farther include: emission duration length
InterferTotalDuration.Fig. 2 gives the signal of authoring system and the schematic diagram of signal parameter.Wherein,
Launch time started skew InterferStartTimeOffset and refer on the basis of the subframe of CR system, authorize
The start time point launching signal of system and the side-play amount of CR system subframe start time point.
The base station of CR system can obtain the signal emission parameter of authoring system in several ways, including
But it is not limited to following several ways:
Mode one: frequency spectrum perception mode.Such as, the base station of CR system is according to received by frequency spectrum perception
Signal on authoring system frequency, by the study statistic processes of a period of time, adds up authorized system
Above-mentioned signal emission parameter.
Mode two: access database mode.Such as, there is authoring system signal the base station of CR system from record
The signal emission parameter of the data base querying mandate EVAC of emission parameter, or record have authoring system to believe
The signal emission parameter authorizing EVAC is pushed to the base station of CR system by the data base of number emission parameter.
Mode three: authoring system assist mode.Such as, the base station of CR system is to authoring system acquisition request
The signal emission parameter of this authoring system.
The base station of step 102:CR system judges whether the signal period of authoring system is that CR system subframe is long
The integral multiple of degree, if it is, perform step 103；Otherwise, CR system is run in a conventional manner.
Such as, in LTE system, subframe lengths is 1ms, it is assumed that the signal period length of authoring system
InterferPeriod is 2ms, then LTE system judges that the signal period of authoring system is that CR system subframe is long
The integral multiple of degree.
Further, the base station of CR system can find that authoring system reappears in current working frequency
Or will reappear, or when authoring system interference exceedes certain thresholding, determine to open adjustment subframe
Process and operate, and after determining the process operation that unlatching adjusts subframe, then perform follow-up judgement operation (i.e.
Judge that whether signal period of authoring system is the integral multiple of CR system subframe length).Wherein, CR system
Base station can determine that authoring system exists by modes such as frequency spectrum perception, database notification or authoring system assistance
Whether reappear in current working frequency or will reappear, or whether determining authoring system interference
Exceed certain thresholding.
Whether the base station of step 103:CR system exists following non-useful signal in judging the subframe of CR system
Part: its time width is more than or equal to signal emission duration length in authoring system each signal period
InterferDurationPerPeriod, if it has, then perform step 104；Otherwise, CR system is according to routine
Mode is run.
Wherein, described non-useful signal refers to: the non-data part that receiving terminal does not detects, such as CR system
The prefix or suffix inserted for certain purpose or protection interval etc..Concrete, in LTE system, non-
Useful signal can be the CP(Cyclic Prefix of SC-FDMA or OFDM symbol, Cyclic Prefix) partly,
PRACH(Physical random access channel, Physical Random Access Channel) CP part, or
The GP(Guard Period of person PRACH, protection interval) part.
The base station of step 104:CR system adjusts the initial time of subframe, makes subframe interior by authoring system
The part of interference carries non-useful signal, and this non-useful signal refers to that its time width in step 103 is more than
Or equal to signal emission duration length in authoring system each signal period
The non-useful signal of InterferDurationPerPeriod parameter.
Concrete, the mode of the original position that the base station of CR system adjusts subframe may is that and adjusts subframe
Original position, by the non-useful signal part determined in step 103, (its time width is more than or equal to
Signal emission duration length InterferDurationPerPeriod in each signal period of authoring system)
Original position move on to this subframe in the original position of part disturbed by authoring system of potential meeting, wherein,
In subframe, potential meeting can be opened according to the transmitting of authoring system signal by the original position of authoring system interference sections
Beginning time migration InterferStartTimeOffset determines.Such as, in subframe x, potential meeting by mandate is
The start time position of the part of system interference is InterferStartTimeOffset, time width etc. in this subframe
Signal emission duration length InterferDurationPerPeriod within each signal period of authoring system
Non-useful signal start time position be the tx after InterferStartTimeOffset, in this case,
Move forward (tx-InterferStartTimeOffset) time span by the original position of CR system subframe.
Certainly, if the time width of non-useful signal part is more than letter in each signal period of authoring system
Number emission duration length InterferDurationPerPeriod, then when carrying out CR system subframe and initiateing
Between position adjustment time, be not limited to above-mentioned adjustment mode, as long as making the time domain disturbed by authoring system in subframe
The most completely in CR system subframe in the domain portion of non-useful signal.
One of base station condition carrying out subframe adjustment due to CR system is: the signal period of authoring system is
The integral multiple of CR system subframe length, according to the feature of authoring system signal period property, in CR system
In each subframe, its potential relative position disturbed by authoring system is identical, therefore adjusts subframe
After initial time, in each subframe, the potential part disturbed by authoring system carries non-useful signal, from
And the signal disturbing of the authoring system suffered by reducing.
Further, when opening interference process operation beginning from the base station of CR system or holding from CR system
The operation of Row sum-equal matrix subframe initial time starts, after InterferTotalDuration time span, and CR
The base station of system is terminated interference and is processed operation, i.e. system is properly functioning, need not carry out embodiment of the present invention institute
Describe judgement and according to judged result adjust subframe initial time.
The base station of CR system, after the initial time adjusting subframe, can send life by the terminal in community
The mode of order, is sent to terminal by subframe adjustment information, so that carrying out synchronizing sub-frame between terminal and base station.
The terminal of CR system can also with the conventional synchronous of base station during, subframe position is entered with base station
Row synchronizes.
The terminal of CR system according to the flow process shown in above-mentioned Fig. 1, can also adjust the initial time of subframe.
Wherein, the terminal of CR system adjusts the signal emission parameter of the authoring system of the initial time institute foundation of subframe,
Can be that base station notifies to terminal after getting the signal emission parameter of authoring system, it is also possible to be terminal
By frequency spectrum perception mode, access what the mode such as data base or authoring system assistance got.
It should be noted that although the above embodiment of the present invention is applicable to TDD system, but TDD system
Requirement the whole network synchronizes, and a community adjusts subframe time, needs whole great Qu all to follow adjustment, may compare
More complicated, therefore the embodiment of the present invention is more applicable for need not the wireless communication system that the whole network synchronizes, or
Be emergency communication, point to point link etc. this be not on a large scale cover (i.e. do not have a lot of neighbor cell need with
Adjustment parameter) wireless communication system.
By above description it can be seen that in the embodiment of the present invention, CR system is according to the signal of authoring system
Emission parameter adjusts CR system subframe, makes the interior part disturbed by authoring system of CR system subframe to hold
Carry the non-useful signal such as prefix or suffix or protection interval, thus avoid CR system to send out at authoring system as far as possible
Useful signal is received so that the useful signal of CR system can avoid the harmful of authoring system in penetrating the time
Interference, it is ensured that the Consumer's Experience of CR system.
Based on identical technology design, the embodiment of the present invention additionally provides a kind of above-described embodiment that can be applicable to
CR system equipment.
See Fig. 3, for the structural representation of the CR system equipment that the embodiment of the present invention provides.This CR system
System equipment can be the network equipment, such as base station or RNC etc., it is also possible to is terminal unit.As it is shown on figure 3,
This equipment comprises the steps that acquisition module 31, judge module 32, adjusting module 33, wherein:
Acquisition module 31, for obtaining the signal emission parameter of authoring system；Wherein, described signal launches ginseng
In each signal period that number comprises the steps that the signal period length of authoring system, authoring system, signal transmitting is held
Continuous time span, authoring system offset relative to the transmitting time started of CR system, may also include mandate system
The signal emission duration length of system；
Judge module 32, for the signal emission parameter according to authoring system, it is judged that the letter of described authoring system
Whether number Cycle Length is the integral multiple of CR system subframe length, and whether CR system exists time width
Not less than the non-useful signal of signal emission duration length in the described authoring system signal period；Wherein,
Non-useful signal refers to that CR system receiving terminal does not carries out the non-data part detected, for LTE system, institute
Stating non-useful signal can be the CP part of SC-FDMA or OFDM symbol, the CP portion of PRACH
Point, or the GP part of PRACH；
Adjusting module 33, for when judge module 32 is judged as YES, adjusts the initial time of subframe, makes
The part disturbed by described authoring system in CR system subframe carries described non-useful signal.
Concrete, it is judged that module 32 can determine that described authoring system reappears in current working frequency
Maybe will reappear, or when the signal disturbing of described authoring system exceedes setting thresholding, sentence described in execution
Disconnected operation.
Concrete, adjusting module 33 can be by adjusting the initial time of subframe, by institute in CR system subframe
State the initial of the part that the original position of non-useful signal moves on to be disturbed by described authoring system in this subframe
Position.
Through the above description of the embodiments, those skilled in the art is it can be understood that arrive the present invention
The mode of required general hardware platform can be added by software to realize, naturally it is also possible to by hardware, but very
In the case of Duo, the former is more preferably embodiment.Based on such understanding, technical scheme is substantially
The part contributed prior art in other words can embody with the form of software product, this computer
Software product is stored in a storage medium, including some instructions with so that a station terminal equipment is (permissible
It is mobile phone, personal computer, server, or the network equipment etc.) perform described in each embodiment of the present invention
Method.
The above is only the preferred embodiment of the present invention, it is noted that common for the art
For technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications,
These improvements and modifications also should regard protection scope of the present invention.
Claims (12)
1. a cognitive radio system subframe method of adjustment, it is characterised in that described method includes:
Cognitive radio CR system equipment obtains the signal emission parameter of authoring system；
Described CR system equipment is according to the signal emission parameter of authoring system, it is judged that the letter of described authoring system
Whether number Cycle Length is the integral multiple of CR system subframe length, and whether CR system exists time width
Not less than the non-useful signal of signal emission duration length in the described authoring system signal period；If so,
The most described CR system equipment adjusts the initial time of subframe, in making CR system subframe by described mandate is
The part of system interference carries described non-useful signal；Wherein, non-useful signal refers to CR system receiving terminal not
Carry out the non-data part detected.
2. the method for claim 1, it is characterised in that described signal emission parameter at least includes:
The signal period length of authoring system；
In each signal period of authoring system, signal emission duration length；
Authoring system offset relative to the transmitting time started of CR system；Wherein, time started skew is launched
Refer on the basis of the subframe of CR system, the start time point launching signal and the CR system of authoring system
The side-play amount of subframe start time point.
3. method as claimed in claim 2, it is characterised in that described signal emission parameter also includes:
The signal emission duration length of authoring system.
4. the method for claim 1, it is characterised in that described CR system equipment is determining
State authoring system to reappear in current working frequency and maybe will reappear, or described authoring system
When signal disturbing exceedes setting thresholding, perform described judgement operation.
5. the method for claim 1, it is characterised in that described CR system equipment adjusts subframe
Initial time, make the part carrying disturbed by described authoring system in CR system subframe described non-useful
Signal, particularly as follows:
Described CR system equipment, by adjusting the initial time of subframe, non-has described in CR system subframe
The original position of the part disturbed by described authoring system in moving on to this subframe by the original position of signal.
6. the method as described in claim 1-5 any one, it is characterised in that at Long Term Evolution LTE
In system, described non-useful signal is single-carrier frequency division multiple access SC-FDMA or orthogonal frequency division multiplex OFDM
The cyclic prefix CP part of symbol, the CP part of Physical Random Access Channel PRACH, or PRACH
Protection interval GP part.
7. a cognitive radio CR system equipment, it is characterised in that including:
Acquisition module, for obtaining the signal emission parameter of authoring system；
Judge module, for the signal emission parameter according to authoring system, it is judged that the signal of described authoring system
Whether Cycle Length is the integral multiple of CR system subframe length, and whether CR system exists time width not
Less than the non-useful signal of signal emission duration length in the described authoring system signal period；Wherein, non-
Useful signal refers to that CR system receiving terminal does not carries out the non-data part detected；
Adjusting module, for when described judge module is judged as YES, adjusts the initial time of subframe, makes
The part disturbed by described authoring system in CR system subframe carries described non-useful signal.
8. equipment as claimed in claim 7, it is characterised in that the signal that described acquisition module gets
Emission parameter at least includes:
The signal period length of authoring system；
In each signal period of authoring system, signal emission duration length；
Authoring system offset relative to the transmitting time started of CR system；Wherein, time started skew is launched
Refer on the basis of the subframe of CR system, the start time point launching signal and the CR system of authoring system
The side-play amount of subframe start time point.
9. equipment as claimed in claim 8, it is characterised in that the signal that described acquisition module gets
Emission parameter also includes: the signal emission duration length of authoring system.
10. equipment as claimed in claim 7, it is characterised in that described judge module specifically for,
Determine that described authoring system reappears in current working frequency maybe will reappear, or described mandate
When the signal disturbing of system exceedes setting thresholding, perform described judgement operation.
11. equipment as claimed in claim 7, it is characterised in that described adjusting module specifically for, logical
Cross the initial time adjusting subframe, the original position of non-useful signal described in CR system subframe is moved on to this
The original position of the part disturbed by described authoring system in subframe.
12. equipment as described in claim 7-11 any one, it is characterised in that at Long Term Evolution LTE
In system, described non-useful signal is single-carrier frequency division multiple access SC-FDMA or orthogonal frequency division multiplex OFDM
The cyclic prefix CP part of symbol, the CP part of Physical Random Access Channel PRACH, or PRACH
Protection interval GP part.
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| WO2010139843A1 (en) * | 2009-06-05 | 2010-12-09 | Nokia Corporation | Cognitive radio transmission |
| CN102075943A (en) * | 2010-09-08 | 2011-05-25 | 中国人民解放军重庆通信学院 | Cognitive radio (CR) ultra wideband (UWB) communication system |
| CN102595420A (en) * | 2011-01-14 | 2012-07-18 | 中国移动通信集团公司 | Dynamic spectrum management system and method |
| CN102857306A (en) * | 2011-06-29 | 2013-01-02 | 中兴通讯股份有限公司 | Channel availability detection method and system, and spectrum management method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010139843A1 (en) * | 2009-06-05 | 2010-12-09 | Nokia Corporation | Cognitive radio transmission |
| CN102075943A (en) * | 2010-09-08 | 2011-05-25 | 中国人民解放军重庆通信学院 | Cognitive radio (CR) ultra wideband (UWB) communication system |
| CN102595420A (en) * | 2011-01-14 | 2012-07-18 | 中国移动通信集团公司 | Dynamic spectrum management system and method |
| CN102857306A (en) * | 2011-06-29 | 2013-01-02 | 中兴通讯股份有限公司 | Channel availability detection method and system, and spectrum management method |
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