CN101741486A - Spectrum resource sharing method for cognitive radio network - Google Patents
Spectrum resource sharing method for cognitive radio network Download PDFInfo
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- CN101741486A CN101741486A CN200910243769A CN200910243769A CN101741486A CN 101741486 A CN101741486 A CN 101741486A CN 200910243769 A CN200910243769 A CN 200910243769A CN 200910243769 A CN200910243769 A CN 200910243769A CN 101741486 A CN101741486 A CN 101741486A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention provides a spectrum resource sharing method for a cognitive radio network. The cognitive radio network comprises a master user, a sub-user, a service base station and a perception base station. The spectrum resource sharing method comprises the following steps: (1) starting spectrum resource sharing between the service base station and the perception base station; (2) measuring the interference temperature of the master user; and (3) adjusting the total power of the perception base station according to the interference temperature of the master user. Compared with the prior art, the invention effectively reduces the waste of the spectrum, improves the throughput rate of the system and the utilization rate of the spectrum, and can effectively guarantee the service quality of the services of the master user.
Description
Technical field
The present invention relates to the cognition wireless technical field of telecommunications, specifically, the present invention relates to a kind of spectrum resource sharing method that is used for cognitive radio networks.
Background technology
Cognitive radio system dynamic frequency spectrum deployment and technology of sharing can significantly improve the overall spectrum utilance.Wherein, the frequency spectrum share technology is not change under the existing spectrum allocation may general structure, sharing frequency spectrum by the different radio electric system and improve the availability of frequency spectrum, and it realizes that difficulty is little than the dynamic frequency spectrum deployment strategy.
The main thought that dynamic spectrum is shared is to share same section frequency spectrum by a plurality of radio systems under the prerequisite of avoiding the phase mutual interference.It relates to that channel is intercepted, the cognitive radio environment, determine messaging parameter, based on technology such as dynamic spectrum resource allocations.Consider the different radio electric system on time and space to frequency spectrum resource utilize unbalanced, adopt sharing mode can utilize limited frequency spectrum resources more fully, thereby improve the system throughput and the availability of frequency spectrum.In general, will provide the system of share spectrum resources to be called main system, the system of the frequency spectrum resource that shared main system is provided be called from system.
Coexistence formula frequency spectrum share method is used the most successful in reality at present.In coexistence formula frequency spectrum sharing method, from system carry out before the access channel with main system between cooperate, and use the frequency range of main system with extremely low power, can not produce and disturb, so need not special Interference Control in the communication process main system.As shown in Figure 1, in the coexistence formula frequency spectrum sharing method, by frequency spectrum share, allow unauthorized (from) user (SUs) frequency spectrum of having an opportunity to insert or insert simultaneously, these frequency spectrum resources are originally distributes to mandate (master) user (PUs), does the remarkable frequency spectrum service efficiency that strengthened like this.But, in the coexistence formula frequency spectrum share mode,, cause the system throughput and the availability of frequency spectrum lower because the transmitting power of unauthorized user must strictly be limited to reduced levels, can only support short haul connection from system, range of application also is subjected to bigger restriction.
Summary of the invention
The purpose of this invention is to provide a kind of dynamic spectrum resource share method of measuring based on interference temperature, thereby improve the system throughput and the availability of frequency spectrum further, and make from system and can support to expand its range of application than long haul communication.
For achieving the above object, the invention provides a kind of spectrum resource sharing method that is used for cognitive radio networks, described cognitive radio networks comprises main user, from user and aware base station, described spectrum resource sharing method comprises the following steps: under the sharing frequency spectrum resource state
1) main user measures local interference temperature and sends it to aware base station;
2) when main user's interference temperature surpassed this main user's threshold value, the aware base station adjustment was to the resource allocation from the user, to reduce the gross power of described aware base station; When main user's interference temperature continued to be lower than this main user's threshold value, the aware base station adjustment was to the resource allocation from the user, to improve the gross power of described aware base station.
Wherein, described step 1) also comprises: main user is by measuring local interference temperature certain measuring period; Described step 2) also comprise: when N continuous in the measuring period, when main user's interference temperature all is lower than its threshold value, judge that this main user's interference temperature continues to be lower than this main user's threshold value, wherein N is at least 2.
Wherein, described step 2) also comprise: adjust to the means from user's resource allocation comprise Call Admission Control, move switch, the user selects and user power control one or more.
Wherein, described step 2) also comprise: when having a plurality of main user, as long as any one main user's interference temperature surpasses thresholding, aware base station promptly reduces its gross power; When interference temperature was all less than threshold value in the measuring period, aware base station improved its gross power to whole main users in N continuous.
Wherein, set first step-length and second step-length, the described first step is grown up in second step-length, described step 2) also comprise: described aware base station reduces its gross power by first step-length, improves its gross power by second step-length.
Wherein, described cognitive radio networks also comprises serving BS and frequency spectrum agency, and described aware base station starts sharing frequency spectrum resource by the frequency spectrum agency.
Wherein, described aware base station is selected the destination service base station of carrying out sharing frequency spectrum resource according to interference temperature thresholding, centre frequency and the bandwidth that can be used for sharing from a plurality of serving BSs.
Compared with prior art, the present invention has reduced the waste of frequency spectrum effectively, has improved the system throughput and the availability of frequency spectrum, makes from system can support than long haul communication, expand its range of application, can effectively ensure the service quality (Qos) of main customer service simultaneously.
Description of drawings
Below, describe embodiments of the invention in conjunction with the accompanying drawings in detail, wherein:
Fig. 1 shows the example based on the cognitive radio system of coexistence formula frequency spectrum share method;
Fig. 2 shows the sequential schematic diagram of the frequency spectrum sharing method of one embodiment of the invention.
Embodiment
The present invention relates to cognitive radio system, usually, cognitive radio system comprises main system, acts on behalf of from system and frequency spectrum, with reference to figure 1, wherein, main system is the objective network of sharing frequency spectrum resource, and it is generally non-sensing network, its access base station is called serving BS, and its user is main user (PU); And be sensing network from system, also can be called cognition network, its access base station is called aware base station, and its user is from user (SU).Aware base station is all acted on behalf of two-way the connection with frequency spectrum with serving BS.Need to prove, above-mentioned cognitive radio system is not unique, the present invention also can adopt the cognitive radio system of other structure, such as can pre-set main system and from the corresponding relation of system frequency spectrum share is used, so just can not use frequency spectrum to act on behalf of.
The present invention relates to the notion of interference temperature.In order to quantize to disturb, FCC (FCC) has proposed a new module, is called interference temperature (IT).Only compare in the past the simple assessment mode based on the transmitter operation, interference temperature model mutual based between the RF environment of reality and transmitter and receiver considered the cumulative effect of all interference sources.This IT is defined as per unit bandwidth radio-frequency (RF) power of other received emitter of reception antenna and noise source generation.More particularly, be exactly on reception antenna, the equivalent degree of per unit bandwidth RF power, the unit of measurement is Kelvin.If f
cAnd B
cCentre frequency and the bandwidth (is unit with the hertz) of expression channel c, P
i(f
c, B
c) representing with the watt to be the power (on reception antenna or measurement mechanism) of unit, k represents Boltzmann constant (1.38 * 10
-23J/K), the interference temperature of channel c so
With reference to figure 2, according to one embodiment of present invention, frequency spectrum sharing method comprises the following steps:
Step 1: aware base station sends the frequency spectrum request message to the frequency spectrum agency, applies for present available spectrum resource; In the frequency spectrum request message, carry information such as the available centre frequency of this aware base station and needed bandwidth.
Step 2: frequency spectrum is acted on behalf of in the station list of this locality, according to information entrained in the frequency spectrum request message, selects a series of base stations as the alternative services base station, and returns spectral response message to aware base station.Carry the alternative services station list in the spectral response message, comprising interference temperature thresholding, the centre frequency of alternative services base station and the bandwidth that can be used for sharing.Usually, the tabulation of frequency spectrum agency's home base stations comprises observable each base station around it, and interference temperature thresholding, the centre frequency of these base stations and the bandwidth (hereafter is an available bandwidth) that can be used for sharing.
Step 3: aware base station is judged the serving BS that whether has in the alternative services station list with the oneself requirement coupling, if do not have, then stops the frequency spectrum share process; If have, then execution in step 4;
Step 4: aware base station is selected a serving BS as the destination service base station from the alternative services station list, by the frequency spectrum response message destination service base station feedback is acted on behalf of to frequency spectrum then, and application starts frequency spectrum share; When the select target serving BS, ordinary priority considers that centre frequency is comparatively approaching, and available bandwidth is bigger, the serving BS that the interference temperature thresholding is higher.According to a preferred embodiment of the present invention, can be weighted summation to above-mentioned three, select wherein optimum serving BS.
Step 5: the frequency spectrum agency starts frequency spectrum share, and notification target serving BS and the success of aware base station spectrum allocation may, and the destination service base station sends the frequency spectrum share notice to main user after the notice of receiving the frequency spectrum agency, inform that present frequency spectrum is in shared state.
Step 6: main user according to measuring local interference temperature certain measuring period, and feeds back to the destination service base station with interference temperature measured value and threshold value after receiving frequency spectrum share notice.The interference temperature threshold value is exactly to satisfy the maximum interference value of this main user's professional Qos requirement.This maximum interference value can draw by means such as reality test and Theoretical Calculation.
Step 7: the destination service base station is transmitted to aware base station with main user's interference temperature measured value and threshold value by core net.
Step 8: based on main user's interference temperature and threshold value thereof, and require and current business load from user's Qos, aware base station is carried out resource allocation, the gross power that this aware base station is current is adjusted, make aware base station to the interference of the main user in the destination service base station cell below the interference temperature thresholding.The adjustment of gross power can be passed through one or more realizations in the technological means such as Call Admission Control, mobile switching, user's selection and user power control.
In the present embodiment, the main user's who receives when aware base station interference temperature is during greater than its threshold value, aware base station reduces the gross power of this aware base station by resource allocation, when N continuous in the measuring period, received main user's interference temperature then can suitably improve the gross power of this aware base station during less than its threshold value.The Qos that so both can preferentially guarantee main user requires to be met, and can improve the availability of frequency spectrum effectively again, improves the throughput of system.N is at least 2, and in a preferred embodiment, N can get 10.
Further, in another embodiment, when having a plurality of main user, as long as any one main user's interference temperature surpasses thresholding, aware base station promptly reduces its gross power; When interference temperature was all less than threshold value in the measuring period, aware base station improved its gross power to whole main users in N continuous.
Further, for the preferential main user's of assurance Qos requires to be met, can also set different step-lengths with improving to the reduction of the gross power of aware base station, the step-length of reduction that makes gross power is greater than the step-length that improves.Described step-length promptly can be the absolute magnitude that power reduces or improves, and also can be the ratio with current total power.Such as, can set the each reduction by 10% of gross power, set the each raising 1% of gross power.Can avoid main user's interference temperature frequently to surpass thresholding so effectively.It should be noted that above-mentioned qualification is exemplary, those skilled in the art can be provided with concrete numerical value according to different applied environments neatly based on above-mentioned design.
Step 9: when the aware base station decision stops frequency spectrum share, send the frequency spectrum share end and act on behalf of to frequency spectrum.Stopping frequency spectrum share can initiatively be triggered by aware base station, also can be passive triggering.Such as, through after the adjustment of step 8, being reduced to as the gross power of aware base station can't be for any when the user provides service, and then passive triggering stops frequency spectrum share.In the present embodiment, also can be in advance be that aware base station is set a minimum gross power, when its gross power was lower than described minimum gross power, passive triggering stopped frequency spectrum share.
Step 10: the frequency spectrum agency starts the frequency spectrum removal process, and sends frequency spectrum recovery notification message respectively to destination service base station and aware base station end frequency spectrum share process.
Step 11: the message informing master user that serving BS finishes frequency spectrum share, thus the interference temperature that finishes main user is measured.
Above said content; only for the concrete execution mode of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed in protection scope of the present invention.
Claims (10)
1. spectrum resource sharing method that is used for cognitive radio networks, described cognitive radio networks comprise main user, from user, serving BS and aware base station, described spectrum resource sharing method comprises the following steps:
1) starts sharing frequency spectrum resource between serving BS and aware base station;
2) measure main user's interference temperature;
3) according to main user's interference temperature the gross power of described aware base station is adjusted.
2. spectrum resource sharing method according to claim 1, it is characterized in that, described step 3) also comprises: when main user's interference temperature surpassed this main user's threshold value, aware base station was adjusted the resource allocation from the user, to reduce the gross power of described aware base station; When main user's interference temperature continued to be lower than this main user's threshold value, the aware base station adjustment was to the resource allocation from the user, to improve the gross power of described aware base station.
3. spectrum resource sharing method according to claim 2 is characterized in that,
Described step 2) also comprise: main user is by measuring local interference temperature certain measuring period;
Described step 3) also comprises: when N continuous in the measuring period, when main user's interference temperature all is lower than its threshold value, judge that this main user's interference temperature continues to be lower than this main user's threshold value, wherein N is at least 2.
4. spectrum resource sharing method according to claim 1, it is characterized in that described step 2) also comprise: adjust to the means from user's resource allocation comprise Call Admission Control, move switch, the user selects and user power control one or more.
5. spectrum resource sharing method according to claim 2 is characterized in that, described step 3) also comprises: when having a plurality of main user, as long as any one main user's interference temperature surpasses thresholding, aware base station promptly reduces its gross power; When interference temperature was all less than threshold value in the measuring period, aware base station improved its gross power to whole main users in N continuous.
6. spectrum resource sharing method according to claim 2, it is characterized in that set first step-length and second step-length, the described first step is grown up in second step-length, described step 3) also comprises: described aware base station reduces its gross power by first step-length, improves its gross power by second step-length.
7. spectrum resource sharing method according to claim 1 is characterized in that, described cognitive radio networks also comprises the frequency spectrum agency, and described step 1) also comprises: described aware base station starts sharing frequency spectrum resource by the frequency spectrum agency.
8. spectrum resource sharing method according to claim 2 is characterized in that, described step 3) also comprises: can't stop frequency spectrum share for any when the user provides service when the gross power of aware base station is reduced to, stop to measure main user's interference temperature.
9. spectrum resource sharing method according to claim 2, it is characterized in that described step 3) also comprises: be that in advance aware base station sets a minimum gross power, when the gross power of aware base station is lower than described minimum gross power, stop frequency spectrum share, stop to measure main user's interference temperature.
10. according to any described spectrum resource sharing method in the claim 1 to 9, it is characterized in that described aware base station is selected the destination service base station of carrying out sharing frequency spectrum resource according to interference temperature thresholding, centre frequency and the bandwidth that can be used for sharing from a plurality of serving BSs.
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| CN102026357A (en) * | 2010-12-17 | 2011-04-20 | 华为技术有限公司 | Power control method and device for base station |
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| CN103269499A (en) * | 2013-05-15 | 2013-08-28 | 京信通信系统（广州）有限公司 | Interference detecting method and network side equipment |
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| WO2013189310A1 (en) * | 2012-06-21 | 2013-12-27 | 中兴通讯股份有限公司 | Control method for cognitive radio system, base station and neighbour relationship |
| CN103812583A (en) * | 2012-11-15 | 2014-05-21 | 电信科学技术研究院 | Cooperative spectrum sensing method and device based on cognitive radio system |
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Assignee: Beijing Zhongke Jingshang Technology Co., Ltd. Assignor: Institute of Computing Technology, Chinese Academy of Sciences Contract record no.: 2011110000143 Denomination of invention: Spectrum resource sharing method for cognitive radio network License type: Exclusive License Open date: 20100616 Record date: 20110823 |
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Application publication date: 20100616 |
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Assignee: Beijing Zhongke Polytron Technologies Inc Assignor: Institute of Computing Technology, Chinese Academy of Sciences Contract record no.: 2011110000143 Date of cancellation: 20181212 |
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Change date: 20181212 Contract record no.: 2011110000143 Assignee after: Beijing Zhongke Polytron Technologies Inc Assignee before: Beijing Zhongke Jingshang Technology Co., Ltd. |