CN105517057A - Method for balancing loads based on spectrum sensing and system - Google Patents
Method for balancing loads based on spectrum sensing and system Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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Abstract
The invention relates to a method for balancing loads based on spectrum sensing and a system, which belongs to the technical field of wireless communication. The method for balancing loads based on spectrum sensing and the system sense spectrum holes in adjacent base stations through overload plots by utilizing a spectrum sensing technology, generates spectrum collection which can be borrowed, then count idleness of the borrowed spectrums, and borrow spectrums with high idleness from the borrowed spectrums according to self load situations, thereby balancing the load of network. The method for balancing loads based on spectrum sensing and the system excellently achieve load balancing by utilizing the spectrum sensing technology, and has wide appliance space.
Description
Technical field
The invention belongs to wireless communication technology field, relate to a kind of load-balancing method based on frequency spectrum perception and system.
Background technology
In cellular radio communication network system, the access customer number of the required carrying in each community and business datum amount etc. are random, uneven distribution, the telephone traffic that particularly Hot Spot causes happens suddenly, and the problems such as network congestion, make the load in whole system be in non-equilibrium state.This just causes user in the community had to can not get satisfactory service, and some cell radio resources are underutilized.
Load-balancing technique the load in heavy duty region is transferred to underload region by suitable method or the resource in underload region is lent heavy duty region, thus realize the reasonable distribution of resource and effectively utilize.
Existing load-balancing technique is divided three classes:
1) based on the load-balancing technique of load transfer: first, base station read be used in conjunction family and be used in conjunction the resource using information at family and calculation base station load, judge the size of load value and predetermined threshold value, determine load condition and broadcast load situation, neighbor base station receives broadcast and preserves.Then, heavy duty base station sends handover request information according to self-demand to the underload base station meeting switching condition.Finally, underload community receives handover request, for reserving resource for switching user, sending and switching confirmation, receive and switch user, thus alleviate the business load of heavy duty community to heavy duty base station.
2) based on the load-balancing technique of channel: first, base station read be used in conjunction family and be used in conjunction the resource using information at family and calculation base station load, judge the size of load value and predetermined threshold value, determine load state, and mutual exchange message, preserve the load state of neighbor base stations and the channel usage of neighbor base stations.Secondly, the channel meeting interference-limited and user's request in underload community is used in heavy duty community.Finally, underload community transmitting channel uses confirmation, thus the problem that the resource alleviating heavy duty community lacks.
3) based on the load-balancing technique of cell breathing: first, base station read be used in conjunction family and be used in conjunction the resource using information at family, calculation base station load, and load information is sent to Network Operation Center, operation centre, under the prerequisite that gross power is certain, distributes the power of base station according to the load of base station, the transmission range of adjustment base station, change the annexation of base station and user, thus balance network load.
In sum, prior art realizes load balancing by adjustment network parameter, and the adjustment of network parameter needs the frequent mutual of information between base station, thus substantially increases network signaling overhead and energy ezpenditure.But, frequency spectrum perception as a kind of can perception surrounding environment adaptively change and adjust the key technology of network parameter, can be used in head it off, and in relevant technology, not a kind of frequency spectrum perception technology to be applied in the mechanism of load balancing.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of load-balancing method based on frequency spectrum perception and system, the frequency spectrum cavity-pocket in frequency spectrum perception technology perception adjacent base station is utilized by overloaded cells, the frequency spectrum set that generation can be used, then calculate the idleness can using frequency spectrum, loading condition according to self uses the high frequency spectrum of idleness from using frequency spectrum, thus the load of equalizing network.
For achieving the above object, the invention provides following technical scheme:
Based on a SiteServer LBS for frequency spectrum perception, this system comprises load detecting module, load computing module, load judgment module, frequency spectrum sensing module, and frequency spectrum uses module and spectrum allocation may module;
Described load detecting module for obtaining the resource service condition of base station in network, and generates resource use list, and resource is used list to send to load computing module;
Described load computing module receives and processes the described resource use list of load detecting module transmission, use the load value of the resource service condition calculation base station of base station in list according to resource, and sent to by the load value of base station described load judgment module and described frequency spectrum to use module;
Described load judgment module receives the load value of base station, and the load value of base station and predetermined threshold value is compared, and judges whether base station transships;
Described frequency spectrum sensing module detect within the frequency spectrum perception cycle and record frequency spectrum take situation, generate according to spectrum occupancy and can use frequency spectrum set;
Described frequency spectrum is used module and is called the load of base station that obtained by load computing module and obtain using by frequency spectrum sensing module the frequency spectrum that frequency spectrum set determines to use, and the frequency spectrum that can use sends to spectrum allocation may module;
Described spectrum allocation may module received spectrum uses the frequency spectrum used that module sends, and is distributed to the user of this base station.
Further, described base station resource service condition comprises the spectrum number re that base station has used
totaland total spectrum number RE.
Further, described load computing module is according to formula
in obtain the load of base station, the load judgment module described in the load of gained base station being sent and described frequency spectrum use module.
Further, described load judgment module is according to the load of the base station sent by described load computing module, and the load of base station and the threshold value preset are compared, if load of base station is greater than default threshold value, then overloaded base stations, calls frequency spectrum and use module; Otherwise, wait for next load balancing cycle.
Further, described frequency spectrum sensing module detect within the frequency spectrum perception cycle and record frequency spectrum take situation; Base station determines frequency spectrum cavity-pocket according to the situation that takies of frequency spectrum, and generation can use frequency spectrum set.
Further, described frequency spectrum uses the load value ρ of the base station that module sends according to described load computing module, and the spectrum number f (ρ) needed for calculation base station, is designated as NB; The frequency spectrum the used set 1 sent according to described frequency spectrum sensing module and the frequency spectrum used that can use in frequency spectrum set 1 are in perception cycle T
1free time distribution obtain the idleness IR that can use frequency spectrum; Frequency spectrum can be used according to the frequency spectrum used can used in frequency spectrum set 1 by idleness and carry out descending, obtain the frequency spectrum the used set 2 after arranging; Use front NB frequency spectrum in the frequency spectrum the used set 2 after sequence.
Further, described spectrum allocation may module to use before in frequency spectrum set 2 NB spectrum allocation may to the user of this base station by described; After using end cycle release borrow frequency spectrum resource.
Present invention also offers a kind of load-balancing method based on frequency spectrum perception, the method mainly comprises the following steps:
1) the load balancing cycle arrives, and base station is read resource and used list, according to the spectrum number re that base station in the Resources list has used
totalwith frequency spectrum sum RE, bring formula into
in obtain the load value of base station;
2) base station is according to the load value of the base station obtained, the load value ρ judging base station and the load threshold ρ preset
thsize: if ρ is less than ρ
th, then base station does not need to use frequency spectrum, waits for next load balancing cycle; If ρ is more than or equal to ρ
th, then base station needs to use frequency spectrum, enters step 3);
3) first, base station is according to the load value of base station, and the spectrum number f (ρ) needed for calculation base station, is designated as NB; Secondly, base station in perception cycle T
1the usable spectrum set obtained in cycle, and according in perception cycle T
1the free time distribution of the frequency spectrum used of record draws the idleness IR that can use frequency spectrum; Finally, the frequency spectrum in usable spectrum set is carried out descending according to idleness, obtain the frequency spectrum the used set after sorting;
4) NB spectrum allocation may will to be carried out before in the frequency spectrum the used set after descending to the user of this base station in base station, and is using cycle T
2releasing resource after terminating, waits for next load balancing cycle.
Beneficial effect of the present invention is: method and system provided by the invention utilizes frequency spectrum perception technology, achieves load balancing well, has wide application space.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the load-balancing mechanism flow chart based on frequency spectrum perception;
Fig. 2 is the flow chart of load computing module;
Fig. 3 is frequency spectrum sensing module flow chart;
Fig. 4 is that frequency spectrum uses block flow diagram;
Fig. 5 is spectrum allocation may block flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
The SiteServer LBS based on frequency spectrum perception that the present invention proposes comprises with lower module, is load detecting module respectively, load computing module, load judgment module, frequency spectrum sensing module, and frequency spectrum uses module and spectrum allocation may module; Wherein, the resource service condition of load detecting module base stations detected; Load computing module reads the resource service condition of base station, the load of calculation base station; Load of base station and predetermined threshold value compare by load judgment module, determine whether overload; The signal that frequency spectrum sensing module detects frequency spectrum judges frequency spectrum cavity-pocket, and generation can use frequency spectrum set; Frequency spectrum uses the frequency spectrum that characteristic that module calls the load of base station situation that obtained by load computing module and obtain using frequency spectrum set intermediate frequency spectrum by frequency spectrum sensing module determines to use; The spectrum allocation may of using is given the user of this base station by spectrum allocation may module.
The concrete operations of load computing module are: base station is read resource and used list, add up the spectrum number re used
totaland total spectrum number RE; Bring formula into
in calculate the load of base station, calculating gained load condition parameter is sent into load judgment module and frequency spectrum uses module.Fig. 2 is the flow chart of load computing module.
The concrete operations of load judgment module are: the load parameter obtained by load computing module compares with the threshold value preset, if load of base station is more than or equal to default threshold value, then enter resource borrowing module, if load of base station is less than default threshold value, then wait for next load balancing cycle.
The concrete operations of frequency spectrum sensing module are: base station is in frequency spectrum perception cycle T
1interior detection and record frequency spectrum take situation; Base station determines frequency spectrum cavity-pocket according to taking situation, and generation can use frequency spectrum set, stored in buffer memory.Fig. 3 is frequency spectrum sensing module flow chart.
The concrete operations that frequency spectrum uses module are: call the load of base station ρ obtained by load computing module, and the spectrum number f (ρ) needed for calculation base station, is designated as NB; Call the frequency spectrum the used set that obtained by base station sensing module and frequency spectrum can be used in perception cycle T
1free time distribution obtain the idleness IR that can use frequency spectrum; The frequency spectrum can used in frequency spectrum set carries out descending by idleness, obtains the frequency spectrum the used set after arranging; Use front NB frequency spectrum in the frequency spectrum the used set after sequence.Fig. 4 is that frequency spectrum uses block flow diagram.
The concrete operations of spectrum allocation may module for: borrowed a NB spectrum allocation may is given the user of this base station by base station; Using cycle T
2terminate after release borrow frequency spectrum resource.Fig. 5 is spectrum allocation may block flow diagram.
Fig. 1 is the load-balancing mechanism flow chart based on frequency spectrum perception, and as shown in the figure, the load-balancing method based on frequency spectrum perception that the present invention proposes, mainly comprises following steps:
1, the load balancing cycle arrives, and base station is read resource and used list, according to the spectrum number re that base station in the Resources list has used
totalwith frequency spectrum sum RE, bring formula into
in obtain the load value of base station;
2, base station is according to the load value of the base station obtained, the load value ρ judging base station and the load threshold ρ preset
thsize;
If 2.1 ρ are less than ρ
th, then base station does not need to use frequency spectrum, waits for next load balancing cycle;
If 2.2 ρ are more than or equal to ρ
th, then base station needs to use frequency spectrum, enters step 3;
3, first, base station is according to the load value of base station, and the spectrum number f (ρ) needed for calculation base station, is designated as NB; Secondly, base station in perception cycle T
1the usable spectrum set obtained in cycle, and according in perception cycle T
1the free time distribution of the frequency spectrum used of record draws the idleness IR that can use frequency spectrum; Finally, the frequency spectrum in usable spectrum set is carried out descending according to idleness, obtain the frequency spectrum the used set after sorting;
4, NB spectrum allocation may will to be carried out before in the frequency spectrum the used set after descending to the user of this base station in base station, and is using cycle T
2releasing resource after terminating, waits for next load balancing cycle.
Embodiment:
In the present invention, the system of case study on implementation comprises base station, and the frequency spectrum of base station, and wherein, this wireless network is made up of 3 base stations, BS
irepresent i-th base station, first suppose BS
1for the subject of implementation of mechanism; Suppose that there are 10 available frequencies each base station, f
i,jwhat represent is the jth frequency of base station i, now supposes BS
1intermediate-frequeney point f
1,1, f
1,2, f
1,3, f
1,5, f
1,6, f
1,7, f
1,8, f
1,9, f
1,10by the CU in base station 1, base station 2 intermediate-frequeney point f
2,2, f
2,3, f
2,6, f
2,9by BS
2cU, base station 3 intermediate-frequeney point f
3,1, f
3,2, f
3,5, f
3,8, f
3,10by BS
3in CU; Suppose ρ
th=0.7, f (ρ)=(ρ-ρ
th) * RE; Suppose that the load balancing cycle is 200ms, the frequency spectrum perception cycle is T
1=20ms, frequency spectrum borrowing time T
2=150ms.The load-balancing mechanism based on frequency spectrum perception is realized by following steps.
1. the load balancing cycle arrives.BS
1call load computing module, read base station resource and use list, add up the spectrum number re used
total(1) and frequency spectrum sum RE (1), bring formula into
in calculate BS
1load, calculating gained load condition parameter is sent into load judgment module and frequency spectrum and uses module.
2.BS
1call the load of base station ρ that load computing module obtains
1, and judge load of base station ρ
1with the load threshold ρ preset
thsize.
If 2.1 ρ
1be less than ρ
th, then BS
1do not transship, do not need to use frequency spectrum, wait for next load balancing cycle;
If 2.2 ρ
1be more than or equal to ρ
th, then BS
1overload, needs to use frequency spectrum, enters frequency spectrum and use module.
Because ρ
1=0.9 is more than or equal to ρ
th=0.8, therefore BS
1need to use frequency spectrum, enter frequency spectrum and use module.
3. frequency spectrum is used module and is first called the load of base station ρ that load computing module obtains
1, the spectrum number f (ρ needed for assumed calculation base station
1)=(ρ
1-ρ
th) * RE=(0.9-0.8) * 10=1, be designated as NB
=1.Next calls by frequency spectrum sensing module in perception cycle T
1usable spectrum set { the f obtained
2,1, f
2,4, f
2,5, f
2,7, f
2,8, f
2,10, f
3,3, f
3,6, f
3,7, f
3,9, and calculate the idleness IR that can use frequency spectrum according to the free time distribution of the frequency spectrum used of frequency spectrum sensing module record, be designated as:
{IR
2,1,IR
2,4,IR
2,5,IR
2,7,IR
2,8,IR
2,10,IR
3,3,IR
3,6,IR
3,7,IR
3,9}。Finally the frequency spectrum in usable spectrum set is carried out descending according to idleness, obtains the frequency spectrum the used set after sorting:
{f
3,3,f
2,1,f
2,4,f
3,9,f
2,5,f
2,8,f
3,6,f
2,7,f
2,10,f
3,7}。Front NB frequency spectrum in the frequency spectrum the used set after sequence is used in base station, namely uses frequency spectrum f
3,3.
4. call spectrum allocation may module, NB=1 the spectrum allocation may of using is given the user of this base station, and using cycle T
2releasing resource after terminating, by the time next load balancing cycle.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (8)
1. based on a SiteServer LBS for frequency spectrum perception, it is characterized in that: this system comprises load detecting module, load computing module, load judgment module, frequency spectrum sensing module, frequency spectrum uses module and spectrum allocation may module;
Described load detecting module for obtaining the resource service condition of base station in network, and generates resource use list, and resource is used list to send to load computing module;
Described load computing module receives and processes the described resource use list of load detecting module transmission, use the load value of the resource service condition calculation base station of base station in list according to resource, and sent to by the load value of base station described load judgment module and described frequency spectrum to use module;
Described load judgment module receives the load value of base station, and the load value of base station and predetermined threshold value is compared, and judges whether base station transships;
Described frequency spectrum sensing module detect within the frequency spectrum perception cycle and record frequency spectrum take situation, generate according to spectrum occupancy and can use frequency spectrum set;
Described frequency spectrum is used module and is called the load of base station that obtained by load computing module and obtain using by frequency spectrum sensing module the frequency spectrum that frequency spectrum set determines to use, and the frequency spectrum that can use sends to spectrum allocation may module;
Described spectrum allocation may module received spectrum uses the frequency spectrum used that module sends, and is distributed to the user of this base station.
2. a kind of SiteServer LBS based on frequency spectrum perception according to claim 1, is characterized in that: described base station resource service condition comprises the spectrum number re that base station has used
totaland total spectrum number RE.
3. a kind of SiteServer LBS based on frequency spectrum perception according to claim 2, is characterized in that: described load computing module is according to formula
in obtain the load of base station, the load judgment module described in the load of gained base station being sent and described frequency spectrum use module.
4. a kind of SiteServer LBS based on frequency spectrum perception according to claim 3, it is characterized in that: described load judgment module is according to the load of the base station sent by described load computing module, the load of base station and the threshold value preset are compared, if load of base station is greater than default threshold value, then overloaded base stations, calls frequency spectrum and uses module; Otherwise, wait for next load balancing cycle.
5. a kind of SiteServer LBS based on frequency spectrum perception according to claim 4, is characterized in that: described frequency spectrum sensing module detect within the frequency spectrum perception cycle and record frequency spectrum take situation; Base station determines frequency spectrum cavity-pocket according to the situation that takies of frequency spectrum, and generation can use frequency spectrum set.
6. a kind of SiteServer LBS based on frequency spectrum perception according to claim 5, it is characterized in that: described frequency spectrum uses the load value ρ of the base station that module sends according to described load computing module, spectrum number f (ρ) needed for calculation base station, is designated as NB; The frequency spectrum the used set 1 sent according to described frequency spectrum sensing module and the frequency spectrum used that can use in frequency spectrum set 1 are in perception cycle T
1free time distribution obtain the idleness IR that can use frequency spectrum; Frequency spectrum can be used according to the frequency spectrum used can used in frequency spectrum set 1 by idleness and carry out descending, obtain the frequency spectrum the used set 2 after arranging; Use front NB frequency spectrum in the frequency spectrum the used set 2 after sequence.
7. a kind of SiteServer LBS based on frequency spectrum perception according to claim 6, is characterized in that: described spectrum allocation may module to use before in frequency spectrum set 2 NB spectrum allocation may to the user of this base station by described; After using end cycle release borrow frequency spectrum resource.
8. based on a load-balancing method for frequency spectrum perception, it is characterized in that: mainly comprise the following steps:
1) the load balancing cycle arrives, and base station is read resource and used list, according to the spectrum number re that base station in the Resources list has used
totalwith frequency spectrum sum RE, bring formula into
in obtain the load value of base station;
2) base station is according to the load value of the base station obtained, the load value ρ judging base station and the load threshold ρ preset
thsize: if ρ is less than ρ
th, then base station does not need to use frequency spectrum, waits for next load balancing cycle; If ρ is more than or equal to ρ
th, then base station needs to use frequency spectrum, enters step 3);
3) first, base station is according to the load value of base station, and the spectrum number f (ρ) needed for calculation base station, is designated as NB; Secondly, base station in perception cycle T
1the usable spectrum set obtained in cycle, and according in perception cycle T
1the free time distribution of the frequency spectrum used of record draws the idleness IR that can use frequency spectrum; Finally, the frequency spectrum in usable spectrum set is carried out descending according to idleness, obtain the frequency spectrum the used set after sorting;
4) NB spectrum allocation may will to be carried out before in the frequency spectrum the used set after descending to the user of this base station in base station, and is using cycle T
2releasing resource after terminating, waits for next load balancing cycle.
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| CN108540984A (en) * | 2018-03-14 | 2018-09-14 | 重庆邮电大学 | A kind of frequency spectrum distributing method, base station and computer-readable medium |
| CN109104735A (en) * | 2018-09-13 | 2018-12-28 | 南京邮电大学 | The power distribution strategies of super-intensive group coordinated multipoint transmission off the net |
| CN111106888A (en) * | 2019-12-10 | 2020-05-05 | 重庆邮电大学 | Multi-mode correlation based step-by-step spectrum sensing method and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108540984A (en) * | 2018-03-14 | 2018-09-14 | 重庆邮电大学 | A kind of frequency spectrum distributing method, base station and computer-readable medium |
| CN108540984B (en) * | 2018-03-14 | 2022-03-22 | 重庆邮电大学 | Spectrum allocation method, base station and computer readable medium |
| CN109104735A (en) * | 2018-09-13 | 2018-12-28 | 南京邮电大学 | The power distribution strategies of super-intensive group coordinated multipoint transmission off the net |
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| CN111106888B (en) * | 2019-12-10 | 2022-03-22 | 重庆邮电大学 | Multi-mode correlation based step-by-step spectrum sensing method and storage medium |
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| CN105517057B (en) | 2019-01-04 |
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