CN102196451A - Dynamic wireless spectrum sharing method suitable for coexistence of systems - Google Patents
Dynamic wireless spectrum sharing method suitable for coexistence of systems Download PDFInfo
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- CN102196451A CN102196451A CN2011101398953A CN201110139895A CN102196451A CN 102196451 A CN102196451 A CN 102196451A CN 2011101398953 A CN2011101398953 A CN 2011101398953A CN 201110139895 A CN201110139895 A CN 201110139895A CN 102196451 A CN102196451 A CN 102196451A
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Abstract
The invention discloses a dynamic wireless spectrum sharing method suitable for the coexistence of a plurality of systems. The method comprises the following steps that: (1) when to perform communication and required to access spectrums, each system detects the spectrum service conditions of an area in which the system is, and selects a proper frequency band to access according to a preset method and own service volume, and simultaneously, enough protective bandwidths are required to be reserved between every two frequency bands to avoid harmful interference; (2) after accessing the spectrums, each system regulates own transmission power and occupied bandwidths according to channel conditions and own service volumes; and (3) because the service volumes of the systems are increased, and the occupied bandwidths of the systems are expanded to cause the reduction in protective bandwidths, each system can automatically regulate own utilized spectrums towards idle spectrums so as to meet own required bandwidths and protective bandwidths.
Description
Technical field
The present invention relates in unauthorized frequency range, acentric multisystem is followed default method, dynamically shares wireless frequency spectrum, satisfies the condition of carrying out efficient communication separately.
Background technology
In recent years, along with the quick growth of radio communication service demand, the especially rise of using as these broadband wireless communications of wireless personal area network (WRAN), wireless lan (wlan) and wireless MAN (WMAN) makes the usable spectrum resource become more and more nervous.Therefore, various wireless communication technologys in order to raising wireless frequency spectrum efficient have obtained extensive studies.The spectrum allocation may degree of putting that present radio regulatory organization is adopted is the principle that fixed frequency band distributes, and frequency spectrum is divided into two parts, authorizes frequency range and unauthorized frequency range.Wherein authorize frequency range to occupy most frequency spectrum, as television broadcast band, and the usable spectrum resource of unauthorized frequency range is few.Along with the high speed development of the emerging wireless communication technology that works in unauthorized frequency range, it is saturated that the frequency spectrum of unauthorized frequency range has been tending towards.
There are some kinds of methods to be used to guarantee that allocated frequency band is shared effectively in the radio-frequency spectrum.Generally speaking, when two radio frequency devices synchronizations same or have when launching on the overlapping frequency band, emission can the phase mutual interference.For example, if radio receiver is being attempted to receive emission from a wireless device, if that the signal level that induces on the antenna of this radio receiver is compared with the impairment level is enough big, reception promptly is successful.Impairment can be hot generted noise, come self-channel imperfectization feature distorted signals or by on the identical frequency band or the interference that generates of other devices that on approaching frequency band, send.The impairment that is caused by other devices is called as interference.
Generally speaking, if the ratio of the signal that receives from wireless device and all interference sources remain on a certain acceptable level or on, then probability that can be given comes successful received signal.This ratio is commonly called carrier/interface ratio (CIR).
For guaranteeing to keep acceptable CIR, wireless protocols and standard are divided into radio-frequency spectrum some channels usually.For guaranteeing high CIR, on different channels, launch with the emitter that setter closes on relatively.
Owing to only have limited number of channels to use in arbitrary frequency band of radio-frequency spectrum, when emitter exceeded number of available channels, channel was repeated to use.For example, if channel is shared by wireless device, the acceptance of signal that will be to by the device emission time generates the interference of certain level.
The interference level that wireless device is accepted on identical frequency band can reduce largely by the frequency band of radio-frequency spectrum is created channel.The reduction of interference level makes whole system keep the higher CIR and the higher desired signal success probability of acceptance.
Before nearest consumer's level wireless device flourish, frequency is shared to a great extent by having and is controlled closely such as management organizations such as (FCC) of Federal Communications Commission that radio transmitting apparatus realizes.This level other be controlled at quantitatively less and can work preferably when detecting easily when reflector, for example for the situation of broadcasting station and TV station's reflector.It is very high frequency(VHF) (VHF) transmission of television that a simple example of the channelizing of FCC control is arranged.FCC forces to carry out a kind of emission standard that the whole nation is divided into the geographic area.Although frequency spectrum is divided into channel 2-13, yet in given geographic area, only be suitable for odd number or even-numbered channels.If be suitable for even-numbered channels in a zone, then odd-numbered channels will use in adjacent area.Thus, guaranteed reflector near the given area on different channels, and it is far away to use the immediate reflector of same frequency to be separated by naturally, produces interference still less thus.
Above control method control emitter is being by management organization's permission when reflector and quantitatively can working preferably more after a little while.Yet the dramatic growth of wireless and non-permission consumer device quantitatively is huge, and does not need permission.Expectation wireless device and network can in unauthorized frequency range, utilize channelizing and and the interference that produced reduce.
Summary of the invention
The dynamic radio frequency spectrum sharing method that the purpose of this invention is to provide a kind of suitable multisystem coexistence, can effectively solve in unauthorized frequency range, the method that acentric multisystem sets according to the present invention, insert suitable frequency range, can increase the transmitting power of self, but and the power sum of potential interference signal must be less than the threshold value of stipulating in the described preordering method.When the system business amount increases, can suitably increase shared spectral bandwidth, but and the protection bandwidth GBW between the adjacent spectra can not be less than the minimum stipulated in presetting method protection bandwidth.If traffic carrying capacity continues to increase; required bandwidth constantly increases; the protection bandwidth is at this moment less than the property protection bandwidth MoveGBW forced to move that stipulates in the presetting method; at this moment each system is according to default method; dynamically adjust own shared frequency band position; when satisfying own required frequency band, make protection bandwidth GBW as far as possible greater than property protection bandwidth MoveGBW forced to move.If after each system's adjustment, the protection bandwidth GBW of system is still less than property protection bandwidth MoveGBW forced to move, but system still needs spread bandwidth, can allow that this system continues spread bandwidth, but protection bandwidth GBW must protect bandwidth MinGBW more than or equal to minimum.When extending to, system bandwidth make protection bandwidth GBW equal minimum protection bandwidth MinGBW; system stops spread bandwidth; afterwards along with each system adjusts the frequency spectrum situation once more, make the protection bandwidth of this system increase, this system just can carry out frequency spectrum and moves and expand subsequently.
To achieve these goals, the invention provides a kind of dynamic radio frequency spectrum sharing method of suitable multisystem coexistence, comprise the steps:
(1) when a system will communicate and need to insert frequency spectrum, survey the frequency spectrum behaviour in service in zone of living in,, select suitable frequency band to insert according to the default method and the size of own service amount, must keep enough protection bandwidth between each frequency range simultaneously, to avoid harmful interference;
(2) be linked into after the frequency spectrum, each system is according to the transmitting power of the size adjustment oneself of channel conditions and own service amount and the bandwidth that takies;
(3) owing to the increase of system business amount, the shared bandwidth expansion of system causes reducing of protection bandwidth, and each system can adjust frequency spectrum automatically moves its direction towards idle frequency spectrum, comes the bandwidth of satisfied needs separately and protects bandwidth.
Through checking, the spectral method of dynamically sharing provided by the invention can make multisystem well share wireless frequency spectrum (detailed process is seen specific implementation process).
In one embodiment of the invention, described step (1) is specially:
(21), inserted the frequency spectrum use information of broadcasting oneself of each system cycle of frequency spectrum according to default method;
(22) according to default method, the system that will insert frequency spectrum sends the frequency spectrum request, and the frequency spectrum of collecting each system that has inserted frequency spectrum uses information;
(23) according to default method, the system that does not need to insert frequency spectrum keeps silent;
(24) according to default method, the system that application inserts frequency spectrum obtains a frequency spectrum use figure according to the information of collecting, and according to this drawing system and self required bandwidth, selects suitable frequency band to insert.
(25) according to default method, frequency band and the protection bandwidth (GBW) between the adjacent system band occupancy that system selects to insert should be greater than property protection bandwidth forced to move (MoveGBW).
In one embodiment of the invention, described step (24) is specially:
(31),, the transmission power information of the other system collected (can with other system as potential interference signal) and a certain threshold values of presetting method regulation need be compared whether at certain band transmit signal according to default method;
(32) described threshold value is a function in the presetting method;
(33) according to default method, if the power level of described potential interference signal is lower than described threshold level, then described system transmits on this wireless channel;
(34) according to default method, if the power level of described potential interference signal is higher than described threshold level, then described system needs switching channels to transmit;
In one embodiment of the invention, described step (2) is specially:
(41) system successfully is linked into after the frequency spectrum, in order to improve signal to noise ratio snr, system can increase transmitting power, at this moment needs the power of interference signal and the threshold value described in the same step of transmitting power sum (41) are compared, and increases transmitting power up to approaching threshold level;
(42) system successfully is linked into after the frequency spectrum, and when number of services increased, the bandwidth of the shared frequency spectrum of system needed to increase thereupon, may cause reducing of protection bandwidth, up to the minimum protection bandwidth MinGBW of presetting method regulation;
In one embodiment of the invention, described step (3) is specially:
(51) owing to the increase of system business demand, shared bandwidth constantly increases, and the protection bandwidth between the adjacent spectra will be reduced to the minimum protection bandwidth of agreement regulation;
(52) the protection bandwidth is too small, and is very big to the harmful interference meeting of system, needs to adjust the frequency spectrum operating position of each system;
(53) because each system is an acentric topological network, each system just needs dynamically to adjust the frequency spectrum behaviour in service according to default method, makes and leaves enough protection bandwidth between each system.
Description of drawings
Fig. 1 is the flow chart of the dynamic radio frequency spectrum sharing method of multisystem coexistence;
Fig. 2 is the protection bandwidth, the schematic diagram of property protection bandwidth forced to move and minimum protection bandwidth;
Fig. 3 inserts frequency spectrum for system dynamics and obtains the flow chart of required frequency band;
Fig. 4 is a system extension, reduces the schematic diagram of bandwidth and mobile frequency band;
Fig. 5 adjusts the flow chart of frequency spectrum separately for system.
Embodiment
Understand and enforcement the present invention for the ease of those of ordinary skills, the present invention is described in further detail below in conjunction with the drawings and the specific embodiments.
Fig. 1 is the explanation of key step of method of the dynamic radio frequency spectrum share of a kind of suitable multisystem coexistence of the present invention; Fig. 2 is the explanation that inserts the required protection bandwidth of frequency spectrum at the system in the step 1 of Fig. 1, and system adjusts the explanation of the required protection bandwidth of frequency band in the step 2 of Fig. 1 and the step 3; How Fig. 3 inserts frequency spectrum at the system in the step 1 of Fig. 1, and inserts the explanation of appropriate frequency bands; Fig. 4 is the expansion that may carry out at the system in the step 2 of Fig. 1 and the step 3, reduces and the explanation of the various actions of mobile frequency band; How Fig. 5 dynamically adjusts the explanation of spectrum position separately at the system in Fig. 1 step 3.
With reference to figure 1, the method for the dynamic radio frequency spectrum share of a kind of suitable multisystem coexistence of the present invention mainly comprises the steps:
Step 1 when a system will communicate and need to insert frequency spectrum, is surveyed the frequency spectrum behaviour in service in zone of living in, according to the default method and the size of own service amount, select suitable frequency band to insert, must keep enough protection bandwidth between each frequency range simultaneously, to avoid harmful interference;
Step 2 is linked into after the frequency spectrum, and each system is according to the transmitting power of the size adjustment oneself of channel conditions and own service amount and the bandwidth that takies;
Step 3, because the increase of system business amount, the shared bandwidth expansion of system causes reducing of protection bandwidth, each system can adjust frequency spectrum automatically moves its direction towards idle frequency spectrum, satisfies the bandwidth and the protection bandwidth of needs separately.
Fig. 2 describes required protection bandwidth GBW and property protection bandwidth MoveGBW forced to move and the minimum relation of protecting bandwidth MinGBW of system among Fig. 1 in detail.
How the system that Fig. 3 describes in detail in the step 1 of Fig. 1 selects suitable frequency band to insert, and comprises the steps:
Step 1, the system cycle ground own frequency spectrum of emission that has inserted frequency spectrum uses information, such as: user ID, frequency band operating position, transmitting power or the like;
Step 2, system's emission that will insert frequency spectrum oneself inserts the information of frequency spectrum, comprising: required bandwidth, required protection amount of bandwidth, and transmitting power or the like;
The frequency spectrum that step 3, the systematic collection that will insert frequency spectrum have inserted system's emission of frequency spectrum uses information, with the frequency bands of several free time as Candidate Set (1);
Step 4, the system that will insert frequency spectrum determines own required bandwidth and the size of protecting bandwidth according to the traffic carrying capacity of oneself, selects suitable frequency band in the frequency band Candidate Set (1) from step 3;
Step 5 supposes that the system that will insert frequency spectrum determines that according to traffic carrying capacity required bandwidth is W, protection bandwidth GBW 〉=MoveGBW, and wherein MoveGBW is the property protection bandwidth forced to move of system.According to these conditions, obtain a candidate band collection (2);
Step 6 in candidate band collection (2), is calculated the power sum P of own transmitting power and interference signal in each candidate's frequency range;
Step 7, with the power sum P in the step 6 relatively with the threshold value P0 that stipulates in the presetting method, if the P＞P0 in certain frequency range then can delete this frequency range from candidate's frequency range collection (2).
Step 8 will be deleted the frequency range of selecting through step 7 and will be called candidate's frequency range collection (3), and the frequency range in this candidate's frequency range collection (3) all is operable.In these frequency ranges, select those shared bandwidth big, protection bandwidth abundance, and allow the frequency band of the frequency band of bigger transmitting power as access.
Fig. 4 describes the expansion that the middle system of the step 2 of Fig. 1 and step 3 may carry out in detail, reduces the various actions of bandwidth and mobile frequency band.
Fig. 5 describes system in the step 3 of Fig. 1 in detail and how to adjust the frequency spectrum of oneself, comprises the steps:
Step 1, system are linked into after the frequency spectrum, and periodically the frequency spectrum of broadcasting oneself uses information;
Step 2, along with the increase of system business amount, required bandwidth also need increase.At this moment, how many bandwidth system cycle ground broadcasting oneself needs to increase;
Step 3, when the system business amount reduced, shared bandwidth also needed to reduce accordingly;
Step 4, system increases bandwidth, and two kinds of possible situations are arranged: (1) unidirectional increase bandwidth (promptly increasing bandwidth towards a direction); (2) twocouese increases bandwidth (being that both direction increases bandwidth together);
Step 5, system reduces bandwidth, and two kinds of possible situations are arranged: (1) unidirectional bandwidth (promptly reducing bandwidth towards a direction) that reduces; (2) twocouese reduces bandwidth (being that both direction reduces bandwidth together);
Step 6 for (1) in the step 3 unidirectional increase bandwidth, can cause the boundary belt reductions of augment direction little.
Step 7, if the protection bandwidth GBW after the system extension bandwidth still more than or equal to property protection bandwidth MoveGBW forced to move, then the frequency spectrum of it and adjacent system does not need to adjust.
Step 8, if the protection bandwidth GBW after the system extension bandwidth is less than property protection bandwidth MoveGBW forced to move, but greater than minimum protection bandwidth MinGBW.The system adjacent with it can automatically adjust spectrum position separately, makes that the GBW of this system can be more than or equal to MoveGBW.
Step 9, if each system still can't satisfy GBW 〉=MoveGBW after adjusting spectrum position, but system still needs to increase bandwidth.At this moment, the tolerable system continues to increase bandwidth, but must guarantee GBW 〉=MinGBW.When GBW=MinGBW, forbid that system increases bandwidth.Afterwards along with each system adjusts the frequency spectrum state once more, this system can carry out frequency spectrum and move and expand.
Step 10 for the increase bandwidth of (2) twocouese in the step 3, may cause the boundary belt reductions on the both direction little.This moment can be according to folk prescription to the step 6--step 9 that increases bandwidth, and system can carry out the corresponding frequency spectrum adjustment.
Step 11, for the system in the step 3 because the reducing of traffic carrying capacity, the shared bandwidth folk prescription of system to or twocouese ground reduce, the protection bandwidth between this system and the adjacent system can increase, and GBW 〉=MoveGBW.The frequency band that other system can occupy separately according to frequency spectrum situation and the spectrum requirement adjustment of self subsequently.
Oneself performance requirement is all satisfied in so so dynamic adjustment up to each system.
The above, only be in order to concrete case study on implementation of the present invention to be described, but be not in order to limit practical range of the present invention, such as those skilled in the art must be covered by the scope of claim of the present invention not breaking away from all equivalence changes of being finished under indicated spirit of the present invention and the principle or modifying.
Claims (5)
1. the dynamic radio frequency spectrum sharing method of a suitable multisystem coexistence is characterized in that may further comprise the steps:
Step 1, detection are judged whether system will communicate and are needed to insert frequency spectrum, if enter step 2;
The frequency spectrum behaviour in service in step 2, detection zone of living in according to the default method and the size of own service amount, selects suitable frequency band to insert, and keeps enough protection bandwidth simultaneously between each frequency range, to avoid harmful interference;
Step 3, be linked into after the frequency spectrum, each system is according to the transmitting power of the size adjustment oneself of channel conditions and own service amount and the bandwidth that takies;
Step 4, because the increase of system business amount, the shared bandwidth expansion of system causes reducing of protection bandwidth, each system can adjust frequency spectrum automatically moves its direction towards idle frequency spectrum, satisfies the bandwidth and the protection bandwidth of needs separately.
2. the dynamic radio frequency spectrum sharing method of suitable multisystem coexistence as claimed in claim 1, its feature
Be: the default method in the described step 2 may further comprise the steps:
S21) judge to insert the frequency spectrum situation, inserted the frequency spectrum use information of broadcasting oneself of each system cycle of frequency spectrum; The system that will insert frequency spectrum sends the frequency spectrum request, and the frequency spectrum of collecting each system that has inserted frequency spectrum uses information; The system that does not need to insert frequency spectrum keeps silent;
S22) system of application access frequency spectrum obtains a frequency spectrum use figure according to the information of collecting, and according to this drawing system and self required bandwidth, selects suitable frequency band to insert;
S23) frequency band and the protection bandwidth between the adjacent system band occupancy of system's selection access should be greater than property protection bandwidth forced to move.
3. the dynamic radio frequency spectrum sharing method of suitable multisystem coexistence as claimed in claim 2, its feature
Be: described S22) may further comprise the steps:
S2201) judge whether at certain band transmit signal, other system as potential interference signal, and is compared the transmission power information of the other system collected and a certain threshold values of presetting method regulation; Wherein, threshold value is a function in the presetting method;
S2202) if the power level of described potential interference signal is lower than described threshold level, then described system transmits on this wireless channel;
S2203) if the power level of described potential interference signal is higher than described threshold level, then described system needs switching channels to transmit.
4. the dynamic radio frequency spectrum sharing method of suitable multisystem coexistence as claimed in claim 1, its feature
Be: described step 3 is specially:
S31) system successfully is linked into after the frequency spectrum, and in order to improve signal to noise ratio snr, system can increase transmitting power, at this moment needs the power and the transmitting power sum of interference signal are compared with a certain threshold values of step, increases transmitting power up to approaching threshold level; Wherein, threshold value is a function in the presetting method;
S32) system successfully is linked into after the frequency spectrum, and when number of services increased, the bandwidth of the shared frequency spectrum of system needed to increase thereupon, may cause reducing of protection bandwidth, up to the minimum protection bandwidth of presetting method regulation.
5. the dynamic radio frequency spectrum sharing method of suitable multisystem coexistence as claimed in claim 1, it is characterized in that: described step 4 is specially:
S41) because the increase of system business demand, shared bandwidth constantly increases, and the protection bandwidth between the adjacent spectra will be reduced to the minimum protection bandwidth of agreement regulation, and the protection bandwidth is too small, harmful interference meeting to system is very big, needs to adjust the frequency spectrum operating position of each system;
S42) because each system is an acentric topological network, each system just needs dynamically to adjust the frequency spectrum behaviour in service according to default method, makes and leaves enough protection bandwidth between each system.
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Application publication date: 20110921 |