CN101150871B - A method, device and system for sensing channels - Google Patents
A method, device and system for sensing channels Download PDFInfo
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Abstract
A method for apperceiving channels includs: a base station divides at least one subregion from a self covering area according to the preset condition; the base station arranges the executing period for each subregion, and directs the selected user terminal to apperceive the appointed channel in the relevant executing period. So, when the base station apperceives in bands, the times of the uniform silent period set by the base station is reduced, the total time of the silent period is shortened, so the serving quality of the CR system is improved, when the base station of the CR system apperceives out of the band, the synchronization disturbance and the neighbour frequency disturbance are avoided, so the apperceive reliability to the accredited user of the CR system is improvrd effectively, so the disturbance of the accredited user is reduced. At the same time, a communication device and a communication system are disclosed.
Description
Technical field
The present invention relates to the communications field, particularly a kind of method, Apparatus and system that channel is carried out perception.
Background technology
At present, radio resource is day by day poor, and the availability of frequency spectrum of the frequency range of having authorized is not high again, and therefore, cognitive radio technology more and more is subjected to paying close attention to widely in academia and industrial quarters.Cognitive radio (Cognitive Radio, CR) technology is a kind of under the prerequisite of not disturbing authorized user, the technology that unauthorized user uses is distributed to frequency spectrum cavity-pocket in high efficient and flexible ground, and so-called frequency spectrum cavity-pocket is meant in the frequency range of having authorized the channel of uncommitted CU in the certain hour section.
Adopt the system of CR technology to be called cognitive system (CR system), the CR system has the ability of perception (Sensing) channel, so-called perception (Sensing) promptly is the signal strength signal intensity that obtains this channel by the detection to channel, signal type, physical parameters such as channel occupancy state take this channel to have determined whether authorized user.On CR system senses self working channel authorized user is arranged, cognitive system must withdraw from current channel within a certain period of time to avoid interference authorized user.The perception of cognitive system is finished jointly by intrasystem base station and user terminal, user terminal can be carried out sense operation in the time period of setting according to the scheduling of base station, also can when being in idle condition, independently carry out sense operation, and sensing results be fed back to serving base station is provided.Because user terminal is distributed in each different place of environment, therefore, the base station can obtain the sensing results at varying environment, thereby has improved the perception of whole C R system, and then prevents from authorized user is caused interference.
Perception in the CR system is divided into two types, and a kind of is perception (In Band Sensing) in the band; Another kind is band outer perception (Out Band Sensing).
Promptly to be the CR system carry out perception to self working channel and its adjacent channel in perception in the band, for example, consults shown in Figure 1ly, and the CR system works is on the N channel, and the CR system carries out perception to N channel, N-1 channel and N+1 channel and promptly is called perception in the band so.
The CR system is in being with during perception, in order to guarantee the correct authorized user that perceives, quiet period need be set on working channel, quiet period is the time period of a setting, the CR system uplink and downlink transfer of data on the channel that quits work in this time period only detects the authorization user signal that may exist on the channel.Behind initial access cognition system of user terminal and access cognition system, the CR system all needs to be with interior perception, and sensing results fed back to serving BS, this distributed cognitive method has improved the perception of whole system, prevents the interference of CR system to authorized user.But in band, there is the adjacent problem of disturbing frequently in the process of perception.For example, the CR system works is on the N channel, and its neighbours CR system works at the N+1 channel or/and on the N-1 channel, so, the CR system is when carrying out perception to the N channel, its neighbours CR system will cause adjacent interference frequently to the CR system if do not stop the uplink and downlink transfer of data, thereby influences the reliability of sensing results.
For solving adjacent interference problem frequently, in the prior art, the CR system when the N channel is carried out perception need with self quiet period and be operated in the N-1 channel or/and the quiet period of the neighbours CR system on the N+1 channel is coordinated to synchronously; In like manner, when the CR system carries out perception to the N-1 channel, need with self quiet period and be operated in the N-2 channel or/and the quiet period of the neighbours CR system on the N-1 channel is coordinated to synchronously; And the CR system is when carrying out perception to the N+1 channel, need with self quiet period and be operated in the N+2 channel or/and the quiet period of the neighbours CR system on the N+1 channel is coordinated to synchronously.Obviously, whenever once be with interior perception, the CR system just needs to carry out coordinating for three times the work of quiet period, and unified quiet period promptly is set three times.Because the number of times of the unified quiet period that is provided with is too much, thereby caused a large amount of subordinate quiet period of appearance in the system, caused system's quiet period overlong time, thereby influenced the service quality of CR system.
And the outer perception of band promptly is that the CR system carries out perception to standby working channel, for example, consults shown in Figure 1ly, and the A of CR system is operated on the N channel, so the A of CR system to N+/-to carry out perception promptly be to be with outer perception to Δ (Δ＞1) channel.
Be that example describes with N+ Δ channel below, outside being with, the A of CR system during perception,, then can cause co-channel interference to the A of CR system if its neighbours CR B of system is operated on the N+ Δ channel, in the prior art, the A of CR system can carry out perception to N+ Δ channel in the quiet period of its neighbours CR B of system; And outside the A of CR system is with during perception, if its neighbours CR C of system is operated on N+ Δ+/-1 channel, then can causes the A of CR system and adjacently disturb frequently, in the prior art, the A of CR system can carry out perception to N+ Δ channel in the quiet period of its neighbours CR C of system.
But, if the neighbours CR B of system and the neighbours CR C of system are operated in N+ Δ channel, N+ Δ+/-1 channel one or any two channels, and be not mutually neighbours CR system, then B of CR system and the C of CR system can not coordinate both quiet period.
Like this, the A of CR system in skimble-scamble quiet period to N+ Δ channel with outside perception just can't avoid co-channel interference or/and the adjacent generation of disturbing frequently, thereby reduced the reliability of the sensing results that obtains, and then cause interference to authorized user.
Summary of the invention
The embodiment of the invention provides a kind of method of channel being carried out perception, Apparatus and system, in order to reduce cognitive system with in the number of times of unified quiet period is set during perception, shortens total quiet period time, and co-channel interference and adjacent frequency interference takes place when avoiding cognitive system to be with outer perception.
The technical scheme that the embodiment of the invention provides is as follows:
A kind of method that channel is carried out perception comprises:
The base station marks off at least one subregion according to pre-conditioned from self overlay area, comprising: determine the physical location of the user terminal that inserted in self overlay area, physical location is met the user terminal ownership of same settings condition to same subregion;
Described base station is that all subregion is provided with implementation period, comprise: the number of determining the user terminal that comprises in all subregion, be defined as the number of times of the unified quiet period that all subregion is provided with according to numerical value minimum in the described number, and the unified quiet period that will be provided with is confirmed as the implementation period of all subregion;
Indication selected user terminal in described base station carries out perception to allocated channel in corresponding implementation period.
A kind of method that channel is carried out perception comprises:
The base station marks off at least one subregion according to pre-conditioned from self overlay area, comprise: determine the interference neighbors base station, described interference neighbors base station comprises the neighbours base station that is operated on described allocated channel and its adjacent channel, to be divided into the interference subregion with the overlapping subregion of each interference neighbors base station coverage area in self overlay area, and will not be divided into non-interference subregion in self overlay area with the overlapping subregion of each interference neighbors base station coverage area;
Described base station is that all subregion is provided with implementation period, comprising: the quiet period of each interference neighbors base station, described base station is set to disturb accordingly the implementation period of subregion, and default perception is set to the implementation period of non-interference subregion effective time;
Indication selected user terminal in described base station carries out perception to allocated channel in corresponding implementation period.
A kind of communicator comprises:
First processing unit is used for marking off at least one subregion according to pre-conditioned from this communicator overlay area;
Second processing unit is used to all subregion that implementation period is set;
The 3rd processing unit is used for selecting user terminal in corresponding implementation period allocated channel to be carried out perception at all subregion;
Communication unit is used to notify selected user terminal in corresponding implementation period allocated channel to be carried out perception;
Wherein, described first processing unit is determined the physical location of the user terminal that inserted in this communicator overlay area, and physical location is met the user terminal ownership of same settings condition to same subregion; Described second processing unit is determined the number of the user terminal that comprises in all subregion, and be defined as the number of times of the unified quiet period that all subregion is provided with according to numerical value minimum in the described number, and the unified quiet period that will be provided with is confirmed as the implementation period of all subregion.
A kind of communicator comprises:
First processing unit is used for marking off at least one subregion according to pre-conditioned from this communicator overlay area;
Second processing unit is used to all subregion that implementation period is set;
The 3rd processing unit is used for selecting user terminal in corresponding implementation period allocated channel to be carried out perception at all subregion;
Communication unit is used to notify selected user terminal in corresponding implementation period allocated channel to be carried out perception;
Wherein, described first processing unit will be divided into the interference subregion with the overlapping subregion of each interference neighbors base station coverage area in this communicator overlay area, and will not be divided into non-interference subregion with the overlapping subregion of each interference neighbors base station coverage area in this communicator overlay area; Described interference neighbors base station comprises the neighbours base station that is operated on described allocated channel and its adjacent channel; The quiet period of each interference neighbors base station of described second processing unit is set to disturb accordingly the implementation period of subregion, and the default perception of this communicator is set to the implementation period of non-interference subregion effective time.
A kind of communication system comprises:
The base station is used for marking off at least one subregion according to pre-conditioned from self overlay area; And be that all subregion is provided with implementation period when perception is arranged in the branch resource band, and the selected user terminal of indication is carrying out perception to allocated channel in corresponding implementation period;
User terminal is used for according to the scheduling of described base station allocated channel being carried out perception;
Wherein, described base station marks off at least one subregion according to pre-conditioned from self overlay area, and be that all subregion is provided with implementation period when perception is arranged in the branch resource band, comprise: physical location in self overlay area is met the user terminal ownership of same settings condition to same subregion, and be defined as the number of times of the unified quiet period that all subregion is provided with according to numerical value minimum in the described number, and the unified quiet period that will be provided with is confirmed as the implementation period of all subregion.
A kind of communication system comprises:
The base station is used for marking off at least one subregion according to pre-conditioned from self overlay area; And be that all subregion is provided with implementation period when perception is arranged in the branch resource band, and the selected user terminal of indication is carrying out perception to allocated channel in corresponding implementation period;
User terminal is used for according to the scheduling of described base station allocated channel being carried out perception;
Wherein, described base station marks off at least one subregion according to pre-conditioned from self overlay area, and be that all subregion is provided with implementation period when perception is arranged in the branch resource band, comprise: will be divided into the interference subregion with the overlapping subregion of each interference neighbors base station coverage area in self overlay area, and the quiet period of each interference neighbors base station is set to the implementation period of respective sub-areas, and will not be divided into non-interference subregion with the overlapping subregion of each neighbours' base station coverage area in self overlay area, and default perception is set to the implementation period of non-interference subregion effective time.
In the embodiment of the invention, the base station in the CR system marks off at least one subregion from self overlay area and for all subregion is provided with implementation period according to pre-conditioned, and the selected user terminal of indication is carrying out perception to allocated channel in corresponding implementation period.Like this, in the CR system is with, during perception, just reduced the number of times of the unified quiet period that is provided with to a certain extent, shortened total quiet period time, thereby improved the service quality of CR system.Simultaneously, during perception, avoided synchronous interference and the adjacent generation of interference phenomenon frequently, thereby improved the sensing reliability of CR system effectively, and then reduced interference outside also be with the base station in the CR system authorized user to authorized user.
Description of drawings
Fig. 1 is perception in the band in the prior art of the present invention and the outer perception schematic diagram of band;
Fig. 2 A is cognitive system architectural framework figure in the embodiment of the invention;
Fig. 2 B is a base station functions structure chart in the embodiment of the invention;
Fig. 3 A is first kind of method flow diagram with interior perception in the embodiment of the invention;
Fig. 3 B is second kind of method flow diagram with interior perception in the embodiment of the invention;
Fig. 4 A is to the method flow diagram with outer perception in the embodiment of the invention;
Fig. 4 B is a base station coverage area schematic diagram in the embodiment of the invention.
Embodiment
In the embodiment of the invention, for reduce cognition (CR) system with in the number of times of set quiet period during perception, and the co-channel interference and the adjacent interference frequently that are produced when reducing the CR system with outer perception, the base station in the CR system marks off at least one subregion according to pre-conditioned from self overlay area; And for all subregion is provided with implementation period, and the selected user terminal of indication carries out perception to allocated channel in corresponding implementation period.
Base station in the CR system need (comprise the N channel to current working channel and adjacent channel thereof, N-1 channel and N+1 channel) be with in during perception, the physical location of the user terminal that has inserted in affirmation self overlay area, described base station, and the user terminal that physical location is approaching ownership is to same subregion, the number of the user terminal that comprises in definite then all subregion, and the number of times that is defined as the unified quiet period of all subregion setting according to numerical value minimum in the described number, the unified quiet period that is provided with promptly be the base station with in be the implementation period that all subregion is provided with during perception, user terminal chosen in all subregion all will carry out perception to allocated channel (N channel) and adjacent channel (the N-1 channel is or/and the N+1 channel) thereof in the quiet period of setting.
And when the base station in the CR system need to N+/-Δ channel (Δ＞1) be with outside during perception, described base station determine earlier to be operated in allocated channel (N+/-Δ channel) and its adjacent channel (N+/-Δ+1 channel and N+/-Δ-1 channel) on neighbours base station (being called the interference neighbors base station), described base station will be divided into the interference subregion with the overlapping subregion of each interference neighbors base station coverage area in self overlay area, and the quiet period of each interference neighbors base station is set to the implementation period of respective sub-areas, and will not be divided into non-interference subregion with the overlapping subregion of each neighbours' base station coverage area in self overlay area, and default perception is set to non-in the implementation period of disturbing subregion effective time; In an implementation period, described base station indicates user terminals all in the corresponding subregion that described allocated channel is carried out perception.
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
Consult shown in Fig. 2 A, in the present embodiment, comprise a plurality of base stations (BS) 20 and a plurality of user terminal 21 in cognitive (CR) system.
Described base station 20 is used for marking off at least one subregion according to pre-conditioned from self overlay area; And for all subregion is provided with implementation period, and the selected user terminal 21 of indication carries out perception to allocated channel in corresponding implementation period;
Described user terminal 21 is used for according to the scheduling of base station 20 allocated channel being carried out perception.
Consult shown in Fig. 2 B, in the present embodiment, base station 20 comprises communication unit 200, first processing unit 201 and second processing unit 202 and the 3rd processing unit 203.
Described communication unit 200 is used for notifying each user terminal 21 with the forms of broadcasting with the implementation period that base station 20 is provided with, and indicates selected 21 pairs of allocated channels of user terminal to carry out perception, and accepts the sensing results that user terminal 21 returns.
Described first processing unit 201 is used for marking off at least one subregion according to pre-conditioned from this communicator overlay area;
Described second processing unit 202 is used to all subregion that implementation period is set;
Described the 3rd processing unit 203 is used for selecting user terminal in corresponding implementation period allocated channel to be carried out perception at all subregion.
Based on the said system framework, in the present embodiment, base station 20A and base station 20B be the neighbours base station each other, base station 20A and base station 20C be the neighbours base station each other, the working channel that base station 20A takies is called the N channel, its adjacent channel is called N-1 channel and N+1 channel, base station 20B is operated on the N-1 channel, and base station 20C is operated on the N+1 channel, obviously, base station 20B and base station 20C are the interference neighbors base stations of base station 20A, and the CR system that base station 20B and base station 20C control separately all is the interference neighbors system of the CR system of base station 20A control.Consult shown in Fig. 3 A, in the present embodiment, base station 20A is as follows with the detailed process of first kind of situation of interior perception:
Step S300: base station 20A determines the physical location of each user terminal 21 of having inserted in self overlay area.
Step S310: the 20A user terminal 21 that physical location is approaching in base station belongs to same subregion.
In actual applications, the approaching user terminal 21 of physical location is when carrying out sense operation, the sensing results that obtains is also more similar, therefore, in the present embodiment, the 20A user terminal 21 that physical location is approaching in base station belongs to same subregion, for example, base station 20A will be the center of circle with certain coordinate points, be that user terminals 21 all in the border circular areas of radius division belongs to same subregion with ε.When user terminal 21 was non-moving property terminal, as long as its physical location does not change, the subregion of its ownership can not change yet; And when user terminal 21 is the mobility terminal, must periodically repartition subregion, to determine the subregion of user terminal 21 current ownership.
Step S320: base station 20A determines the number of the user terminal 21 that comprises in each subregion, and wherein minimum numerical value is set to U.
In the present embodiment, base station 20 is defined as the number of times of the unified quiet period that all subregion is provided with according to the relation of U and preset value K, wherein, and the number of the user terminal 21 that K needs when representing that a channel carried out effective perception at least, K round numbers and K 〉=1.
Step S330: when 2K≤U＜3K, base station 20A is provided with twice unified quiet period (quiet period) for all subregion of dividing.
In the present embodiment, in being with during perception, the unified quiet period that base station 20A is provided with is all subregion unified implementation period just, base station 20A notifies each user terminal 21 with the forms of broadcasting with the quiet period (implementation period) that is provided with, and the selected portable terminal of scheduling carries out perception to allocated channel and its adjacent channel in quiet period.
Step S340: in first quiet period, base station 20A coordinates quiet period of self and the quiet period of base station 20B to synchronously, make the quiet period on N-1 channel, N channel, N+1 channel and the N+2 channel synchronous, then, base station 20A all selects 2K user terminal 21 and respectively N channel and N+1 channel is carried out perception from each subregion, wherein, belong in 2K the user terminal 21 of same subregion the same channel of every K user terminal 21 perception.
For example, during K=1, base station 20A selects 21 pairs of N channels of a user terminal to carry out perception respectively from each subregion, from each subregion, select 21 pairs of N+1 channels of a user terminal to carry out perception simultaneously respectively, promptly in same subregion, select 2 user terminals respectively N channel and N+1 channel to be carried out perception, because therefore U 〉=2K and K 〉=1, comprise 2 user terminals 21 at least in each subregion.
Step S350: in second quiet period, base station 20A coordinates quiet period of self and the quiet period of base station 20C to synchronously, quiet period on N+1 channel, N channel, N-1 channel and the N-2 channel has also been realized synchronously, then, base station 20A all selects 2K user terminal 21 respectively N channel and N-1 channel to be carried out perception from each subregion, wherein, belong in 2K the user terminal 21 of same subregion the same channel of every K user terminal 21 perception.
In above-mentioned situation, unified quiet period only is set twice, base station 20A has just finished perception in the band by the user terminal in all subregion 21, with respect to prior art, reduced the number of times that unified quiet period is set to a certain extent, shorten total quiet period time, thereby improved the service quality of CR system.The user terminal 21 of carrying out perception in the band in all subregion sends to base station 20A with the sensing results that obtains, and base station 20A obtains N channel, N-1 channel and N+1 channel respectively at the link-quality of different subregions by analyzing the sensing results that receives.
Certainly, base station 20A also can finish perception to N channel and N-1 channel by said method in first quiet period, and finishes the perception to N channel and N+1 channel in second quiet period.
In addition, base station 20A can also finish perception to N channel and N-1 channel by said method in first quiet period, and in second quiet period, finish perception to the N+1 channel, perhaps in first quiet period, finish perception, and in second quiet period, finish perception the N-1 channel to N channel and N+1 channel.
As seen, 20A performed operation in first quiet period and second quiet period in base station can be replaced, and the quantity of base station 20A channel of institute's perception in each quiet period can change, this depends primarily on the influence that the interference neighbors base station is caused, generally speaking, base station 20A can select to make the less scheme of subordinate quiet period of interference neighbors base station.
Be different from above-mentioned situation, when U 〉=3K, 20 need in base station are provided with quiet period one time, just can finish the perception to N channel, N-1 channel and N+1 channel.Consult shown in Fig. 3 B, in the present embodiment, base station 20A is as follows with the detailed process of second kind of situation of interior perception:
Step S3000: base station 20A determines the physical location of each user terminal 21 of having inserted in self control area.
Step S3100: the 20A user terminal 21 that physical location is approaching in base station belongs to same subregion, and the number of the user terminal 21 that comprises in definite each subregion, and wherein Zui Xiao numerical value is set to U.
Step S3200: when U 〉=3K, all subregion setting once unified quiet period (implementation period) of base station 20A for dividing.
Step S3300: in the quiet period that is provided with, base station 20A coordinates quiet period of self and the quiet period of base station 20B and base station 20C to make the N channel to synchronously, and the quiet period on N+/-1 channel and N+/-2 channels is synchronous.
Step S3400: base station 20A all selects 3K user terminal 21 respectively N channel, N-1 channel and N+1 channel to be carried out perception from each subregion, wherein, belongs in 3K the user terminal 21 of same subregion the same channel of every K user terminal 21 perception.
Because U 〉=3K and K 〉=1, so comprise 3K user terminal 21 in each subregion at least.
In above-mentioned two kinds of situations, can select at random when base station 20A selects user terminal 21 in all subregion also can select according to the condition of setting, base station 20A selects 21 pairs of different user terminals respectively allocated channel (N channel) and its adjacent channel (the N-1 channel is or/and the N+1 channel) to be carried out perception in same subregion.
Like this, only be provided with once unified quiet period, base station 20A has just finished perception in the band by the user terminal in all subregion 21, and obtains N channel, N-1 channel and the link-quality of N+1 channel at different subregions according to the sensing results that each user terminal 21 returns.Like this, just further reduced the number of times of the unified quiet period of base station 20A setting, shortened total quiet period time, thereby further improved the service quality of CR system.
Be different from above-mentioned two kinds of situations, in the third situation, when U＜2K, base station 20A is provided with unified quiet period three times, and all selects K user terminal that N channel, N-1 channel or N+1 channel are carried out perception in each quiet period from all subregion.In this process, when base station 20A determines not have the interference neighbors base station to be operated on the N-1 channel, the quiet period that is used for N channel and N+1 channel are carried out perception in three quiet period that can be provided with is set to section continuous time, like this, base station 20A all can indicate 21 pairs of N channels of relevant user terminals to carry out perception in this time period, thereby reduced the subordinate quiet period time that is provided with on the N+1 channel, and then shortened total quiet period time.
On the other hand, when base station 20A to the N+ outside the N channel/-when Δ (Δ＞1) channel detects outside being with, base station 20A need divide subregion according to the distribution situation of self overlay area and neighbours' interference base station overlay area, and indicate respectively all user terminals 21 in all subregion in the implementation period of correspondence to N+/-the Δ channel carries out perception.Be perceived as example outside need being with N+ Δ channel with base station 20A below and describe, consult shown in Fig. 4 A, in the embodiment of the invention, base station 20 is as follows with the detailed process of outer perception:
Step 400: base station 20A determines to be operated in the interference neighbors base station on N+ Δ channel, N+ Δ-1 channel and N+ Δ+1 channel.
In the present embodiment, the neighbours base station 20B of base station 20A is operated on the N+ Δ channel, and neighbours base station 20C is operated on N+ Δ+1 channel.According to above-mentioned situation, when 21 pairs of N+ Δs of the user terminal channel that has inserted in base station 20A indication self overlay area carried out perception, base station 20B can cause co-channel interference, and base station 20C can cause adjacent interference frequently, obviously, base station 20B and base station 20C are the interference neighbors base stations of base station 20A.
Step S410: base station 20A divides subregion in self coverage.
Consult shown in Fig. 4 B bend part, the lap of base station 20A self overlay area and 20B overlay area, base station is set to the first strong jamming district; Consult among Fig. 4 B shown in the horizontal line part, the lap of base station 20A self overlay area and 20C overlay area, base station is set to the second strong jamming district; Consult among Fig. 4 B shown in the pure color part, the part that base station 20A only belongs to self overlay area is set to non-interference range.
Step S420: base station 20A is that all subregion is provided with implementation period.
For the first strong jamming district, the quiet period of the CR system of 20A base station, base station 20B control is set to the implementation period in the first strong jamming district; And for the second strong jamming district, the quiet period of the CR system of 20A base station, base station 20C control is set to the implementation period in the second strong jamming district.
For non-interference range, because user terminal 21 wherein is not in the overlapping region of 20 overlay areas, two base stations, so can not produce co-channel interference or adjacent interference frequently, therefore, base station 20 default perception are set to the implementation period of non-interference range effective time, being that user terminal 21 in the non-interference range can carry out perception to N+ Δ channel in any time in perception effective time, generally speaking, is when self is in idle condition N+ Δ channel to be carried out perception.
In actual applications, if there is lap the overlay area of base station 20B and base station 20C, it is base station 20B and base station 20C neighbours base station each other, the quiet period of base station 20B and base station 20C can be coordinated to synchronously so, in this case, the above-mentioned first strong jamming district is identical with the implementation period in the second strong jamming zone.
Step S430: all user terminals 21 carry out perception to N+ Δ channel in the base station 20A indication all subregion in corresponding implementation period, and sensing results is back to base station 20A.
Step S440: base station 20A receives the sensing results that each user terminal 21 returns in default perception effective time, and all sensing results are carried out analysis-by-synthesis, finally generates unified perception report.
In the above-described embodiments, because the user terminal 21 in first, second strong jamming district carries out perception to N+ Δ channel respectively in the quiet period of base station 20B and base station 20C, therefore, co-channel interference phenomenon and adjacent interference phenomenon frequently can not take place.Like this, base station 20A is the mode by subregion just, under avoiding producing co-channel interference and adjacent situation about disturbing frequently, obtained the link quality information of N+ Δ channel at each user terminal 21 in self overlay area, thereby improved the sensing reliability of CR system effectively, and then reduced interference authorized user to authorized user.
Certainly, if the neighbours base station 20B of base station 20A and neighbours base station 20C are operated in N+ Δ channel, N+ Δ-1 channel and N+ Δ+1 channel one or any two channels, and be not mutually the neighbours base station, base station 20A can not repeat them here by the way avoiding producing the perception of finishing under co-channel interference and the adjacent situation about disturbing frequently N+ Δ channel yet so.
In addition, the user terminal 21 in first, second strong jamming district can also ask base station 20B and base station 20C to transmit the sensing results of N+ Δ channel respectively in perception effective time, also can realize same technique effect, also repeats no more at this.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (16)
1. the method that channel is carried out perception is characterized in that, comprising:
The base station marks off at least one subregion according to pre-conditioned from self overlay area, comprising: determine the physical location of the user terminal that inserted in self overlay area, physical location is met the user terminal ownership of same settings condition to same subregion;
Described base station is that all subregion is provided with implementation period, comprise: the number of determining the user terminal that comprises in all subregion, be defined as the number of times of the unified quiet period that all subregion is provided with according to numerical value minimum in the described number, and the unified quiet period that will be provided with is confirmed as the implementation period of all subregion;
Indication selected user terminal in described base station carries out perception to allocated channel in corresponding implementation period.
2. the method for claim 1, it is characterized in that, in an implementation period, described base station coordinates the quiet period and the quiet period of self of interference neighbors base station to synchronously, and described interference neighbors base station comprises the neighbours base station that is operated on described allocated channel and its adjacent channel.
3. method as claimed in claim 2 is characterized in that, in an implementation period, described base station selects K user terminal that described allocated channel is carried out perception wherein respectively from all subregion according to preset value K, and K is that integer and K are more than or equal to 1.
4. method as claimed in claim 3, it is characterized in that, the numerical value of described minimum is during more than or equal to 2K and less than 3K, described base station is provided with implementation period twice, in each implementation period, described base station all selects 2K user terminal to carry out perception to one in described allocated channel and its adjacent channel respectively from all subregion, wherein, belongs to K the same channel of user terminal perception of same subregion.
5. method as claimed in claim 3, it is characterized in that, the numerical value of described minimum is during more than or equal to 3K, described base station is provided with implementation period one time, in each implementation period, described base station all selects 3K user terminal respectively described allocated channel and its adjacent channel to be carried out perception from all subregion, wherein, belongs to K the same channel of user terminal perception of same subregion.
6. the method that channel is carried out perception is characterized in that, comprising:
The base station marks off at least one subregion according to pre-conditioned from self overlay area, comprise: determine the interference neighbors base station, described interference neighbors base station comprises the neighbours base station that is operated on described allocated channel and its adjacent channel, to be divided into the interference subregion with the overlapping subregion of each interference neighbors base station coverage area in self overlay area, and will not be divided into non-interference subregion in self overlay area with the overlapping subregion of each interference neighbors base station coverage area;
Described base station is that all subregion is provided with implementation period, comprising: the quiet period of each interference neighbors base station, described base station is set to disturb accordingly the implementation period of subregion, and default perception is set to the implementation period of non-interference subregion effective time;
Indication selected user terminal in described base station carries out perception to allocated channel in corresponding implementation period.
7. method as claimed in claim 6 is characterized in that, in an implementation period, described base station indicates user terminals all in the corresponding subregion that allocated channel is carried out perception.
8. method as claimed in claim 7 is characterized in that, described base station receives the sensing results that each user terminal returns and carries out analysis-by-synthesis in default perception effective time, to obtain final perception report.
9. a communicator is characterized in that, comprising:
First processing unit is used for marking off at least one subregion according to pre-conditioned from this communicator overlay area;
Second processing unit is used to all subregion that implementation period is set;
The 3rd processing unit is used for selecting user terminal in corresponding implementation period allocated channel to be carried out perception at all subregion;
Communication unit is used to notify selected user terminal in corresponding implementation period allocated channel to be carried out perception;
Wherein, described first processing unit is determined the physical location of the user terminal that inserted in this communicator overlay area, and physical location is met the user terminal ownership of same settings condition to same subregion; Described second processing unit is determined the number of the user terminal that comprises in all subregion, and be defined as the number of times of the unified quiet period that all subregion is provided with according to numerical value minimum in the described number, and the unified quiet period that will be provided with is confirmed as the implementation period of all subregion.
10. communicator as claimed in claim 9, it is characterized in that, described the 3rd processing unit was coordinated the quiet period of interference neighbors base station and the quiet period of this communicator to synchronously in an implementation period, and from all subregion, select K user terminal that described allocated channel is carried out perception respectively according to preset value K, wherein, K be integer and K more than or equal to 1, described interference neighbors base station comprises the neighbours base station that is operated on described allocated channel and its adjacent channel.
11. a communicator is characterized in that, comprising:
First processing unit is used for marking off at least one subregion according to pre-conditioned from this communicator overlay area;
Second processing unit is used to all subregion that implementation period is set;
The 3rd processing unit is used for selecting user terminal in corresponding implementation period allocated channel to be carried out perception at all subregion;
Communication unit is used to notify selected user terminal in corresponding implementation period allocated channel to be carried out perception;
Wherein, described first processing unit will be divided into the interference subregion with the overlapping subregion of each interference neighbors base station coverage area in this communicator overlay area, and will not be divided into non-interference subregion with the overlapping subregion of each interference neighbors base station coverage area in this communicator overlay area; Described interference neighbors base station comprises the neighbours base station that is operated on described allocated channel and its adjacent channel; The quiet period of each interference neighbors base station of described second processing unit is set to disturb accordingly the implementation period of subregion, and the default perception of this communicator is set to the implementation period of non-interference subregion effective time.
12. communicator as claimed in claim 11 is characterized in that, described the 3rd processing unit indicates in an implementation period that all user terminals carry out perception to described allocated channel in the corresponding subregion.
13. a communication system is characterized in that, comprising:
The base station is used for marking off at least one subregion according to pre-conditioned from self overlay area; And for all subregion is provided with implementation period, and the selected user terminal of indication carries out perception to allocated channel in corresponding implementation period; User terminal is used for according to the scheduling of described base station allocated channel being carried out perception;
Wherein, described base station marks off at least one subregion according to pre-conditioned from self overlay area, and be that all subregion is provided with implementation period when perception is arranged in the branch resource band, comprise: physical location in self overlay area is met the user terminal ownership of same settings condition to same subregion, and be defined as the number of times of the unified quiet period that all subregion is provided with according to numerical value minimum in the described number, and the unified quiet period that will be provided with is confirmed as the implementation period of all subregion.
14. communication system as claimed in claim 13, it is characterized in that, in an implementation period, described base station coordinates the quiet period of interference neighbors base station and the quiet period of this base station to synchronously, and from each subregion, select to meet the user terminal of setting number respectively described allocated channel is carried out perception, described interference neighbors base station comprises the neighbours base station that is operated on described allocated channel and its adjacent channel.
15. a communication system is characterized in that, comprising:
The base station is used for marking off at least one subregion according to pre-conditioned from self overlay area; And be that all subregion is provided with implementation period when perception is arranged in the branch resource band, and the selected user terminal of indication is carrying out perception to allocated channel in corresponding implementation period;
User terminal is used for according to the scheduling of described base station allocated channel being carried out perception;
Wherein, described base station marks off at least one subregion according to pre-conditioned from self overlay area, and be that all subregion is provided with implementation period when perception is arranged in the branch resource band, comprise: will be divided into the interference subregion with the overlapping subregion of each interference neighbors base station coverage area in self overlay area, and the quiet period of each interference neighbors base station is set to the implementation period of respective sub-areas, and will not be divided into non-interference subregion with the overlapping subregion of each neighbours' base station coverage area in self overlay area, and default perception is set to the implementation period of non-interference subregion effective time.
16. communication system as claimed in claim 15 is characterized in that, in an implementation period, described base station indicates user terminals all in the corresponding subregion that described allocated channel is carried out perception.
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| US8315645B2 (en) * | 2008-07-01 | 2012-11-20 | Futurewei Technologies, Inc. | System and method for scheduling of spectrum sensing in cognitive radio systems |
| CN102271021B (en) * | 2010-06-02 | 2014-09-03 | 华为技术有限公司 | Cooperative spectrum sensing method, base station and terminal |
| CN102421183B (en) * | 2010-09-27 | 2014-10-22 | 电信科学技术研究院 | Method, device and system for realizing interference control and interference avoidance |
| CN102457338B (en) * | 2011-11-09 | 2013-12-04 | 南京邮电大学 | Method for selecting multi-user sensing channel in cognitive sensor network |
| US8594023B2 (en) * | 2011-12-16 | 2013-11-26 | International Business Machines Corporation | Quasi-dynamic spectrum access for internet of things (IOT) applications |
| CN103517283B (en) | 2012-06-29 | 2016-11-23 | 电信科学技术研究院 | Frequency spectrum sensing method in cognitive radio system and equipment |
| CN103581868B (en) * | 2012-07-19 | 2017-09-29 | 华为技术有限公司 | One kind perceives quiet period collocation method, apparatus and system |
| CN105992223B (en) * | 2015-02-03 | 2019-07-12 | 普天信息技术有限公司 | The method of frequency spectrum is determined in a kind of radio system |
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| CN1996784A (en) * | 2006-07-18 | 2007-07-11 | 北京邮电大学 | A method for sensing the pilot frequency, collecting the network information, and broadcasting them to the terminal |
| CN101026446A (en) * | 2006-02-21 | 2007-08-29 | 华为技术有限公司 | Method for determining asynchronous silent period for sensing wireless regional area network system |
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| CN101026446A (en) * | 2006-02-21 | 2007-08-29 | 华为技术有限公司 | Method for determining asynchronous silent period for sensing wireless regional area network system |
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