CN107018515A - Heterogeneous hierarchical LTE system fractional frequency reuse method based on intermediary's region optimizing - Google Patents
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Abstract
The invention discloses a kind of heterogeneous hierarchical LTE system fractional frequency reuse method based on intermediary's region optimizing, macrocell is divided into K sector as needed, then macrocell is divided into central area from inside to outside, intermediary region and fringe region, 3K sub-regions altogether, then the frequency spectrum for carrying out macro base station user MUE in each sub-regions according to macro base station user MUE frequency spectrum distribution principle is pre-allocated, and the frequency spectrum predistribution of secondary base station FBS in each sub-regions is carried out according to secondary base station FBS frequency spectrum distribution principle, determine that method determines the optimal value of intermediary's region outer radius using the optimal outer radius in intermediary region based on interference probe, finally complete the final division and frequency spectrum distribution of macrocell area.Optimizing can be carried out by the radius in agency region using the present invention, realize that the macrocell area of low cross-layer interference and high spectrum utilization is divided, and by carrying out frequency spectrum division to macro base station user in every sub-regions and secondary base station, reduction interference improves throughput of system.
Description
Technical field
The invention belongs to heterogeneous hierarchical LTE communication technical field, more specifically, it is related to one kind and is sought based on intermediary region
Excellent heterogeneous hierarchical LTE system fractional frequency reuse method.
Background technology
As LTE system is in real-life widespread deployment, in order to improve Cell Edge User service quality and cell
Handling capacity, the secondary base station (Femto-Cell Basestation, FBS) of low transmission power and macro base station (Macro-Cell
Basestation, MBS) the layered heterogeneous network scheme that coexists obtained widely applying.Secondary base station FBS uses mobile network
The mandate frequency range of network operator, and can dispose different sub-band be respectively allocated to the orthogonal modes of macrocell and secondary cell from
And interference is avoided, but thing followed cost is low network capacity and low frequency spectrum utilization rate.Secondary base station can be also deployed as with height
Cross-layer disturbs the co-channel mode multiplexing of for cost, macro base station and secondary base station share spectrum resources, so as to improve network throughput.
But no matter which kind of pattern, how to solve the interference between secondary base station and macro base station is that can heterogeneous hierarchical LTE network into all the time
The key of work(deployment.
Fractional frequency reuse (Fractional Frequency Reuse, FFR) technology has higher attention rate as one kind
OFDM interference coordination technique with efficiency is extensive with its low complex degree, minimum signaling consumption and high cell coverage
Applied in heterogeneous hierarchical cellular network.The fundamental mechanism of fractional frequency reuse is that whole frequency spectrum is divided into multiple subbands, each
Subband is respectively allocated to regions different in different macrocells or a macrocell.The effect so reached be macro base station and
It is not overlapping between the frequency spectrum resource of secondary base station, then the interference between macro base station and secondary base station is also reduced therewith.At present
Main flow FFR schemes are more prone to that different zones will be divided into macrocell, are then taken according to the difference that different zones are disturbed
The FFR schemes of corresponding frequencies multiplexing factor (Frequency Reuse Factor, FRF).
Fig. 1 is that macrocell area divides schematic diagram.As shown in figure 1, it is grand according to distance center that current macrocell, which is divided,
Base station distance is divided into central area (Center Region, CR) and fringe region (Edge Region, ER).In central area
With different frequency spectrums is used in fringe region, this scheme reduces the interference of fringe region user, improves cell edge use
The service quality at family.But this scheme frequency efficiency is low, largely weakens cell load ability and reply is used
The increased situation of family burst.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of heterogeneous hierarchical based on intermediary's region optimizing
LTE system fractional frequency reuse method, by macrocell area carry out sector division, and be divided into from inside to outside central area, in
Jie region and fringe region, while the radius in agency region carries out optimizing, to macro base station user and secondary in every sub-regions
Base station carries out frequency spectrum division, and reduction interference, improves throughput of system while the availability of frequency spectrum is ensured.
For achieving the above object, the heterogeneous hierarchical LTE system fractional frequency of the invention based on intermediary's region optimizing is answered
Comprised the following steps with method：
S1：Preliminary region division is carried out to macrocell area first, division methods are：In macrocell area, according to need
Macrocell is divided into K sector, K >=1 then will be with macrocell centre distance [0, r1] in the range of region be used as center
Region, will be with macrocell centre distance in (r1,r2] in the range of region as intermediary region, remaining area as fringe region,
Division obtains 3K sub-regions, wherein r1＜ r2＜ R, r1Central area radius is represented, is determined according to actual needs, r2In expression
Jie region outer radius, is required value, and R represents the radius of macrocell；
S2：The frequency spectrum of macro base station user MUE in each sub-regions is carried out according to macro base station user MUE frequency spectrum distribution principle
Pre-allocate, frequency spectrum distribution principle is：Macro base station user MUE in the central area of K sector is used uniformly a subband, each
Macro base station user MUE in the intermediary region of sector and fringe region using a subband, and with central area, adjacent sectors
Intermediary region is different with fringe region；
S3：Divided in advance according to the frequency spectrum that secondary base station FBS frequency spectrum distribution principle carries out secondary base station FBS in each sub-regions
Match somebody with somebody, distribution principle is：Secondary base station FBS in the central area and intermediary region of each sector is used and the sector and adjacent fan
Secondary base station FBS in area in subbands different macro base station user MUE, the fringe region of each sector is using the side with the sector
Subband different macro base station user MUE in edge region；
S4：Determine that method determines intermediary region outer radius r using the optimal outer radius in intermediary region based on interference probe2's
Optimal value, its specific method comprises the following steps：
S4.1：Cell pattern is built according to actual conditions, using the macrocell area in step S1 as in cell pattern
Heart cell, sets every cell pattern parameter, including channel model parameters, and according to step S1 in addition to macrocell area
Other cells carry out region division；
S4.2：N number of time of spaced set on the center line of the one of sector of macrocell area as center cell
Level base station user FUE is used as sensing point；
S4.3：Intermediary region outer radius r is set2=r1；
S4.4：Simulation times t=1 is set；
S4.5：Some macro base station user MUE and secondary base station are generated by the way of spreading at random a little in cell pattern
FBS, is that each secondary base station user FUE as sensing point configures a secondary base station FBS, according to step S2's and step S3
Frequency spectrum distribution principle determines macro base station user MUE and secondary subband used in the FBS of base station；
S4.6：Emulation obtains the handling capacity of all macro base station user MUE and the secondary base station user as sensing point, adds up
It is used as throughput of system；
S4.7：Judge whether that t ＜ T, T represent Monte Carlo simulation number of times, if it is, into step S4.8, otherwise entering
Step S4.9；
S4.8：Make t=t+1, return to step S4.5；
S4.9：The throughput of system that T emulation is obtained is averaged, and it is corresponding that calculating obtains current intermediary's zone radius
Average system throughput；
S4.10：Make intermediary region outer radius r2=r2+Δr；
S4.11：Judge whether r2＞ R, if it is not, return to step S4.4, otherwise into step S4.12；
S4.12：Search obtains maximum from all average system throughputs, during corresponding intermediary region outer radius is
The optimal outer radius in Jie region；
S5：The optimal outer radius in intermediary region obtained according to step S4 completes the final division of macrocell area, and each is grand
Base station user MUE subregions according to residing for its own position judgment, the frequency spectrum predistribution result in step S2 determines to be made
With subband, each secondary base station FBS subregion according to residing for its own position judgment, the frequency spectrum predistribution knot in step S3
Fruit determines to use subband.
Heterogeneous hierarchical LTE system fractional frequency reuse method of the invention based on intermediary's region optimizing, as needed will be grand
It is small to divide into K sector, macrocell is then divided into central area, intermediary region and fringe region from inside to outside, altogether 3K
Sub-regions, then carry out the frequency of macro base station user MUE in each sub-regions according to macro base station user MUE frequency spectrum distribution principle
Spectrum predistribution, and the frequency spectrum for carrying out secondary base station FBS in each sub-regions according to secondary base station FBS frequency spectrum distribution principle are pre-
Distribution, determines that method determines the optimal value of intermediary's region outer radius using the optimal outer radius in intermediary region based on interference probe,
Finally complete the final division and frequency spectrum distribution of macrocell area.It can be entered using the present invention by the radius in agency region
Row optimizing, realizes that the macrocell area of low cross-layer interference and high spectrum utilization is divided, and by grand base in every sub-regions
Stand user and secondary base station carries out frequency spectrum division, reduction interference, improves throughput of system while the availability of frequency spectrum is ensured.
Brief description of the drawings
Fig. 1 is that macrocell area divides schematic diagram；
Fig. 2 is the specific embodiment party of the heterogeneous hierarchical LTE system fractional frequency reuse method of the invention based on intermediary region
Formula flow chart；
Fig. 3 is that the macrocell area of 6 sectors in the present embodiment divides schematic diagram；
Fig. 4 is the present embodiment intermediate frequency spectrum predistribution schematic diagram；
Fig. 5 is the flow chart that the optimal outer radius in intermediary region based on interference probe in the present invention determines method；
Fig. 6 is the structure chart of 19 subzone networks in the present embodiment；
Fig. 7 is the handling capacity of secondary base station user FUE in the present embodiment with intermediary's region outer radius changing trend diagram；
Fig. 8 is macro base station user MUE and secondary base station FBS distribution maps in 19 subzone networks in the present embodiment；
Fig. 9 be under different FFR methods in Target cell secondary base station user FUE total throughouts with secondary base station FBS quantity
Changing trend diagram；
Figure 10 be under different FFR methods Target cell macro base station user MUE total throughouts with secondary base station FBS quantity change
Change tendency chart；
Figure 11 be under different FFR methods overall system throughput with secondary base station FBS quantity changing trend diagram；
Figure 12 is the secondary base station user signal to noise ratio comparison diagram before and after the distribution optimization of the present embodiment intermediate frequency spectrum；
Figure 13 be under different FFR methods outage probability with signal-noise ratio threshold value changing trend diagram.
Embodiment
The embodiment to the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that, in the following description, when known function and design detailed description perhaps
When can desalinate the main contents of the present invention, these descriptions will be ignored herein.
Embodiment
Fig. 2 is the specific embodiment party of the heterogeneous hierarchical LTE system fractional frequency reuse method of the invention based on intermediary region
Formula flow chart.As shown in Fig. 2 the heterogeneous hierarchical LTE system fractional frequency reuse method based on intermediary region of the invention include with
Lower step：
S201：The preliminary region division of macrocell：
Preliminary region division is carried out to macrocell area first, division methods are：In macrocell area, as needed will
Macrocell is divided into K sector, and K >=1 then will be with macrocell centre distance [0, r1] in the range of region be used as center
Domain, will be with macrocell centre distance in (r1,r2] in the range of region as intermediary region, remaining area as fringe region, draw
Get 3K sub-regions, wherein r1＜ r2＜ R, r1Central area radius is represented, is determined according to actual needs, r2Represent intermediary
Region outer radius, is required value, and R represents the radius of macrocell.
It can be seen that, macrocell can be divided into 3K sub-regions by the region partitioning method in the present invention, i.e., K sector,
Respectively there are a central area, intermediary region and fringe region in each sector.Central area is a border circular areas, its radius r1's
Span is generally 0.25R≤r1≤ 0.5R, intermediary region is an annular region, and its inside radius is r1, outer radius is r2。
This sentences K=6, r1=0.45R, r2Exemplified by=0.6R, illustrate that what macrocell area in the present invention divided implements.Fig. 3 is this
The macrocell area of 6 sectors divides schematic diagram in embodiment.As shown in figure 3, macrocell is divided into 6 fans in the present embodiment
Area, is represented by X1 to X6, and three regions are divided into from inside to outside：Central area, intermediary region and fringe region, therefore draw altogether
Get 18 sub-regions.
S202：Macro base station user frequency spectrum is pre-allocated：
The distribution of subregion frequency spectrum is broadly divided into macro base station user MUE frequency spectrum distribution and secondary base station FBS frequency spectrum is distributed,
In the present invention, frequency spectrum predistribution is carried out to macro base station user MUE in each sub-regions first, then again to secondary base station FBS
Carry out frequency spectrum predistribution.
Because the macro base station user MUE in central area and macro base station MBS distances are near, preferable Service Quality ensure that
Measure, therefore the macro base station user MUE in the central area of K sector is used uniformly a subband.In order to avoid same layer is disturbed, often
Macro base station user MUE in the intermediary region of individual sector and fringe region using a subband, and with central area, adjacent sectors
Intermediary region it is different with fringe region.Macro base station user in each sub-regions can be obtained by according to above frequency spectrum distribution principle
MUE subband.
Fig. 4 is the present embodiment intermediate frequency spectrum predistribution schematic diagram.As shown in figure 4, all frequency spectrum resources are drawn in the present embodiment
It is divided into 7 subbands, respectively A, B, C, D, E, F, G.It is assumed that A subbands to be distributed to the macro base station in the central area of K sector
User MUE.Then by taking the X1 of sector as an example, macro base station user MUE in its intermediary region and fringe region not with central area phase
Together, therefore using B subbands.In order to there is no spectrum overlapping with sector X1, the sector X2 and X6 adjacent with sector X1 intermediary region
A, B subband, therefore sector X2 and X6 intermediary region and fringe region can not be used with the macro base station user MUE in fringe region
Interior macro base station user MUE uses G subbands and C subbands, by that analogy, the intermediary region for other sectors of reallocating and edge respectively
The subband that macro base station user MUE in region is used.
S203：Secondary base station frequency spectrum predistribution：
For secondary base station FBS, secondary base station FBS in the central area and intermediary region of each sector use with
The sector subband different with macro base station user MUE in adjacent sectors, so as to reduce macro base station MBS in same sector and adjacent sectors
Cross-layer interference between secondary base station FBS.And in order to ensure the availability of frequency spectrum of fringe region, the fringe region of each sector
Interior secondary base station FBS uses the subband different from macro base station user MUE in the fringe region of the sector.
It is also shown in FIG. 4, according to above distribution principle, the secondary base station in central area and intermediary region in the X1 of sector
FBS should avoid using A, B, C, G subband, then its optional subband set is { D, E, F }, and the secondary base station FBS of fringe region should
When avoid use B subbands, then its optional subband set be { A, C, D, E, F, G }.By that analogy, reallocate other sectors each
The subband that secondary base station FBS in region is used.Frequency spectrum allocation result according to Fig. 4 can be seen that using institute of the present invention
The frequency spectrum distribution of completion, each subband is obtained for more sufficient utilization, and its availability of frequency spectrum is of a relatively high.
It can be seen from sub-zones frequency spectrum pre-distribution scheme, intermediary region is located between central area and fringe region,
Cause the characteristics of its frequency spectrum distribution principle should have two above region concurrently.It is grand in intermediary region for macro base station user MUE
Base station user MUE is similar with fringe region, with macro base station MBS farther out, therefore uses and the macro base station user MUE in fringe region
Identical spectrum allocation schemes.And for secondary base station FBS, on the one hand intermediary region has a common boundary with central area, the opposing party
The macro base station user MUE of face and adjacent sectors closes on, it is contemplated that two aspect interference problems：One is to avoid central area and intermediary
Mutual cross-layer interference between region, two be to avoid the same layer between intermediary region and adjacent sectors from disturbing and cross-layer interference, because
This secondary base station FBS is used and the secondary base station FBS identical spectrum allocation schemes in central area.
S204：Determine optimal intermediary region outer radius：
In existing heterogeneous hierarchical LTE system fractional frequency reuse method, the macro base station user MUE and edge of central area
Secondary base station user FUE in region has certain spectrum overlapping, thus intermediate region and fringe region boundary MUE and
FUE has significant cross-layer to disturb, in the present invention, and the effect in intermediary region is one layer of frequency spectrum of construction not overlapping region, lowers MUE
Cross-layer interference between FUE.Understood that following two conclusions can be drawn according to principles above：1) introducing in intermediary region is structure
Frequency spectrum not overlapping region is made, this design is the bigger availability of frequency spectrum of intermediary's region outer radius to reduce spectrum efficiency as cost
It is lower；2) size in intermediary region has influence on MUE and FUE cross-layer interference, and intermediary's region outer radius is bigger, MUE and FUE by
Cross-layer interference it is smaller.It follows that the design of intermediary's region outer radius is an equalizing system spectrum utilization efficiency and system
The problem of interference, how to design intermediary region outer radius r2Value will directly influence systematic function.
For this problem, the present invention proposes a kind of optimal outer radius in intermediary region based on interference probe and determines method.
Fig. 5 is the flow chart that the optimal outer radius in intermediary region based on interference probe in the present invention determines method.As shown in figure 5, this hair
Intermediary's region optimal radius based on interference probe in bright determines that the specific steps of method include：
S501：Build cell pattern：
Cell pattern is built according to actual conditions, the center of the macrocell area in step S201 as cell pattern is small
Area, sets every cell pattern parameter, including channel model parameters, and according to step S201 to its in addition to macrocell area
He carries out region division, the radius r of central area during other small Divisions at cell1With intermediary region outer radius r2Set as needed
Put.
S502：Sensing point is configured：
The N number of secondary base station of spaced set on the center line of the one of sector of macrocell area as center cell
User FUE is used as sensing point.
S503：Intermediary region outer radius r is set2=r1。
S504：Simulation times t=1 is set.
S505：Configure macro base station user and secondary base station：
Some macro base station user MUE are generated by the way of spreading at random a little in cell pattern, are each as sensing point
Secondary base station user FUE configure a secondary base station FBS, according to step S202 and step S203 frequency spectrum distribution principle determination
Macro base station user MUE and secondary subband used in the FBS of base station, each secondary base station FBS settings transimission power are identical, and corresponding
Channel parameter between secondary base station user FUE is constant, and the resource block phase that each secondary base station user FUE is distributed
Together.
S506：Emulation obtains throughput of system：
Emulation obtains the handling capacity of all macro base station user MUE and the secondary base station user as sensing point, and add up conduct
Throughput of system.
S507：Judge whether that t ＜ T, T represent Monte Carlo simulation number of times, if it is, into step S508, otherwise entering
Step S509.
S508：Make t=t+1, return to step S505.In the present invention Monte Carlo is used when emulation obtains throughput of system
Emulation, because being to spread generation macro base station user MUE and secondary a base station FBS, single experiment result at random in step S505
Some feature position MUE and HeNB performance can only be embodied, can not real reaction intermediary zone radius to overall system performance
Influence, so needing to solve this problem using Multi simulation running.
S509：Calculate average system throughput：
The throughput of system that T emulation is obtained is averaged, and it is corresponding average that calculating obtains current intermediary's zone radius
Throughput of system.
S510：Make intermediary region outer radius r2=r2+ Δ r, Δ r represents radius step-length.
S511：Judge whether r2＞ R, if it is not, return to step S504, otherwise into step S512.
S512：Determine the optimal outer radius in intermediary region：
Search obtains maximum from all average system throughputs, and corresponding intermediary region outer radius is intermediary region
Optimal outer radius.
S205：Macrocell final area is completed to divide and frequency spectrum distribution：
The optimal outer radius in intermediary region obtained according to step S204 completes the final division of macrocell area, each grand base
Stand user MUE subregions according to residing for its own position judgment, the frequency spectrum predistribution result in step S202 determines to be made
With subband, each secondary base station FBS subregion according to residing for its own position judgment, the frequency spectrum predistribution in step S203
As a result determine to use subband.
For secondary base station FBS, because its frequency spectrum distribution principle is looser relative to macro base station user MUE, because
This according to the divisions of spectral sub-bands, per sub-regions in secondary base station FBS there is optional subband set, the secondary in the subregion
Base station FBS can arbitrarily select a subband in optional subband set., can be with when so secondary base station FBS carries out frequency spectrum distribution
Selected according to the annoyance level difference of optional subband, i.e., its optional subband set first obtained according to its frequency spectrum distribution principle,
Test signal to noise ratio when it selects different optional subbands, the subband that the maximum subband of selection signal to noise ratio is used as it.
In order to which technical scheme is better described, simulating, verifying is carried out using an instantiation.The present embodiment
Middle cell pattern uses 19 subzone networks.Fig. 6 is the structure chart of 19 subzone networks in the present embodiment.As shown in fig. 6, in this implementation
In 19 subzone networks employed in example, each cell macro base station MBS is deployed in center of housing estate, the center cell 0 of system
It is exactly Target cell, its macro base station MBS is located at the origin of coordinates (0,0) and surround by 18 adjacent cells.Design 19 cell patterns
Purpose be to make simulation result more accurate, actual environment is approached as far as possible, but the number of cells in actual environment is much larger than
19 cells, it is contemplated that service ability and simulation time must be in tolerance intervals, and 19 cell patterns are proper schemes.
Table 1 is 19 cell system parameter lists.
| Systematic parameter | Numerical value |
| Network size | 2 layers (19 cell) |
| Radius of society | 280m |
| Secondary radius of society | 30m |
| Macro base station MBS transimission powers | 20W |
| Secondary base station FBS transimission powers | 20mW |
| Macro base station user's MUE quantity | 50 |
| User FUE quantity in secondary base station | 1 |
| Channel width | 10MHz |
| Number of sub-channels | 50 |
| Carrier wave interval | 15KHz |
| Power Spectrum of White Noise density | -174dBm/Hz |
Table 1
In 19 subzone networks, a generation macro base station user MUE and secondary base station FBS is spread at random.According to macro base station user
MUE and secondary base station FBS position, you can know its subregion being located in correspondence macrocell, adopted so as to obtain it
Sub-band information.
The channel model that simulating, verifying is used is as follows：
According to the typical Urban channel models of 3GPP, the path loss of system channel is different according to different scenes,
According to the difference of service link and interfering link, main channel path loss formula is as follows, and wherein MUE represents macro base station MBS
User, FUE represents secondary base station FBS user.
1) path loss (service link, interfering link) PL between MUE and MBSMFor：
PLM=28+35log10(d)dB
2) path loss (service link) PL between FUE and FBSF：
Wherein d represents the path length between FUE and FBS.
3) path loss (interfering link) PL ' between FUE and other FBSM：
4) path loss (interfering link) PL ' between FUE and MBSF：
FUE and MBS path is made up of two parts, d1For outdoor path length, d2For indoor path length.Damage in its path
Consuming formula is：
Above path loss unit is dB, and parasang is " rice ".
The key factor of decision systems handling capacity is the sub-carrier signal-noise ratio size that user uses.For heterogeneous hierarchical LTE
System, interference by same layer interference and cross-layer interference collectively forming, and be sub-divided on subcarrier can by this interference characterisation be from
Macro base station MBS interference and secondary base station FBS interference, in addition it should also be taken into account that white noise acoustic jamming.So for one
Signal to noise ratio on macro base station user, its used subcarrier k can be expressed as：
Wherein, moleculeFor signal power,The carrier powers of macro base station MBS on sub-carrierk are represented,
The path loss between macro base station user and corresponding macro base station MBS is represented, belongs to the path loss of service link.Denominator is by three
Divide and constitute, N0Δ f represents white noise acoustical power, due to being to carry out performance evaluation for subcarrier, then the white noise of a subcarrier
Sound and its carrier wave interval and Power Spectrum of White Noise N0Density is relevant,Represent that what subcarrier k was subject to all comes from
Other macro base stations MBS interference, M ' expressions are in addition to the macro base station MBS of user service link, and other produce the grand of interference to it
Base station MBS.SimilarlyRepresent the disturbing from secondary base station FBS sub-carriers k that is subject to, F represents to produce it dry
The secondary base station FBS disturbed.WhereinWithMacro base station MBS and the carrier wave work(of secondary base station FBS on sub-carrierk are represented respectively
Rate,WithMacro base station MBS and the path losses of secondary base station FBS on sub-carrierk are represented respectively.
The signal to noise ratio of secondary base station user f on sub-carrierk can similarly be drawnIt can be expressed as
Visible disturbance mostlys come from all secondary base station F ' in addition to the secondary base station FBS of service link and all
Macro base station M.
According to the signal to noise ratio of each macro base station user MUE on each subcarrier, you can calculating obtains channel capacity, by institute
There is macro base station user MUE to be summed in each subcarrier upper signal channel capacity, you can to obtain macro base station user MUE total throughout.Adopt
The total throughout for obtaining secondary base station user FUE can be calculated with same method.By macro base station user MUE total throughout and
Secondary base station user FUE total throughout is added, you can obtain overall system throughput.
Method, which is imitated, to be determined to the optimal outer radius in intermediary region based on interference probe employed in the present invention first
True checking.It can be seen from the optimal outer radius in intermediary region based on interference probe determines the flow of method, grand base in difference emulation
Stand user MUE position sets different, its handling capacity exist it is uncertain, therefore herein only using the secondary base station as sensing point
Illustrated exemplified by user FUE handling capacity.Fig. 7 is the handling capacity of secondary base station user FUE in the present embodiment with intermediary region
Outer radius changing trend diagram.As shown in fig. 7, being used as the secondary base of sensing point with the increase of intermediary's region outer radius at the beginning
The user FUE handling capacity of standing is gradually increasing, in r2Maximum is reached at=0.68R, it may thus be appreciated that intermediary region in the present embodiment
The optimal outer radius r of outer radius2=0.68R=0.68*280 ≈ 190.
Used to embody in the technical advantage of the present invention, this simulating, verifying without FFR methods (NO_FFR), hard FFR side
Method (S_FFR), FFR3 methods, FFR6 methods algorithm as a comparison.For the present invention, sector number K=3, K=6 are set respectively, i.e.,
Simulating, verifying is carried out using 3 sectors (FFR3-R) and 6 sectors (FFR6-R) two ways.Separately below in this simulating, verifying
Each method be briefly described.
● without FFR methods
In without FFR methods, all macro base station MBS and secondary base station FBS of heterogeneous hierarchical LTE system are using identical
Mandate frequency spectrum.
● hard FFR methods
In hard FFR methods, heterogeneous hierarchical LTE system is distinguished into central area and fringe region due to cell, together
When central area and fringe region in macro base station MBS and secondary base station FBS use different frequency ranges.
● FFR3 methods and FFR6 methods
In FFR3 methods and FFR6 methods, macrocell is in addition to being divided into central area, fringe region, on the whole
The macro base station user MUE service being divided into respectively in 3 and 6 sectors, each sector again be by directional aerial come
Realize, macro base station user MUE is used in the fringe region of each sector subband and the macro base station user MUE of central area
The subband that secondary base station FBS is used in difference, the central area of each sector is different from macro base station user MUE in the sector,
The subband that secondary base station FBS is used in the fringe region of each sector is different from macro base station user MUE in the region.
● FFR3-R methods and FFR6-R methods
FFR6-R methods are using the frequency spectrum distributing method shown in Fig. 4.FFR3-R methods are similar with FFR6-R, simply its fan
Zoning is divided into 3, i.e., it is 9 to divide obtained subregion altogether, also according to the frequency spectrum of fractional frequency reuse method of the present invention
Distribution principle carries out frequency spectrum distribution.
It is same to arrange macro base station user MUE and secondary base station using spreading at random a little in this contrast simulation verification process
FBS.Fig. 8 is macro base station user MUE and secondary base station FBS distribution maps in 19 subzone networks in the present embodiment.As shown in figure 8, its
Middle stain represents macro base station user MUE, and ash point represents secondary base station FBS.It is under the secondary base station of varying number to obtain
Throughput performance of uniting change, this simulating, verifying is respectively 30,60,90 and 120 this 4 kinds of scenes in secondary base station FBS quantity
Under carried out emulate and obtain data, obtain systematic function variation tendency.
Fig. 9 be under different FFR methods in Target cell secondary base station user FUE total throughouts with secondary base station FBS quantity
Changing trend diagram.It can draw to draw a conclusion according to Fig. 9：1) secondary base station user FUE total throughouts are with secondary base station
The increase of FBS quantity and rise；2) with secondary base station FBS increase, the same layer interference between secondary base station FBS rises, secondary
Level base station user FUE total throughout ascendant trends slow down；3) FFR3 methods and FFR6 methods contrast can draw, number of sectors by
3 increases can further reduce the cross-layer interference of system for 6, and when secondary base station FBS quantity is 60, secondary base station user FUE is gulped down
The amount of telling rises to 69.6Mbps by 58.4Mbps, and system secondary base station user FUE handling capacities rise about 19%；4) contrast respectively
FFR3 methods can show that the introducing in intermediary region reduces secondary base station with FFR3-R methods, FFR6 methods and FFR6-R methods
User FUE cross-layers are disturbed, and improve secondary base station user FUE handling capacities；5) FFR methods (FFR3-R methods and FFR6- of the present invention
R methods) show best systematic function in the case of different secondary base station FBS quantity.
Figure 10 be under different FFR methods Target cell macro base station user MUE total throughouts with secondary base station FBS quantity change
Change tendency chart.It can be drawn to draw a conclusion according to Figure 10：1) macro base station user MUE total throughouts with secondary base station FBS quantity
Rise and fall, its reason, which essentially consists in secondary base station FBS, to be increased so that macro base station user MUE cross-layers, which are disturbed, to be increased；2)FFR3
Method can show that number of sectors is disturbed by 3 increases for 6 cross-layers that can further reduce system, secondary with the contrast of FFR6 methods
When level base station FBS quantity is 60, macro base station user MUE total throughouts rise to 62.4Mbps, system macro base station by 26.8Mbps
User MUE handling capacities rise 133%, and this is due to that macro base station user MUE is significantly subtracted by the same layer interference from macro base station MBS
It is few；3) contrast FFR3 methods can be drawn with FFR3-R methods, FFR6 methods and FFR6-R methods respectively, the introducing drop in intermediary region
Low macro base station user MUE cross-layers interference；4) FFR methods (FFR3-R methods and FFR6-R methods) of the present invention are in different secondary base
Best systematic function is shown in the case of FBS quantity of standing.
In summary macro base station user MUE is with secondary base station user FUE handling capacities in system, and the system that can obtain always is handled up
Amount increases variation tendency with secondary base station FBS quantity.Figure 11 be under different FFR methods overall system throughput with secondary base station FBS
The changing trend diagram of quantity.As shown in figure 11, it can be clearly seen that FFR methods (FFR3-R methods and FFR6-R methods) of the present invention
Compared with the lifting that other schemes have very big throughput of system, it is seen that the present invention has obvious technical advantage compared with prior art.
Further, since in the present embodiment, macro base station user's MUE preferred channels resources in frequency spectrum distribution also to each region
Quantity and secondary base station FBS subband selection provide further optimization method, therefore frequency spectrum optimization method is also carried out
Contrast simulation checking.Control methods is respectively：Without FFR methods (method A), FBS subbands are not selected using according to signal to noise ratio
The inventive method (method B), using the inventive method (method C) that FBS subbands are selected according to signal to noise ratio.From time of Target cell
10 FUE are randomly choosed in level base station user FUE.Figure 12 is the secondary base station user before and after the distribution optimization of the present embodiment intermediate frequency spectrum
Signal to noise ratio comparison diagram.As shown in figure 12, FUE has spectrum overlapping with high power macro base station and done by serious cross-layer in method A
Disturb and disturbed with layer, as a result of intermediary region in method B, there is larger improvement to FUE signal to noise ratio, and during method C is removed
Outside Jie region, the distribution optimization of FBS frequency spectrums is also introduced, signal to noise ratio has further lifting.
Because the purpose that frequency spectrum distribution optimization is carried out in the present embodiment is to carry out user performance equilibrium, ensureing all users
Lifting system handling capacity while communication quality, if only using throughput of system as criterion if can not embody this point,
Performance Evaluation further is carried out using outage probability (outage probability) herein, outage probability is defined as user in son
Instantaneous signal-to-noise ratio on carrier wave is less than the probability of signal-noise ratio threshold.When carrying out simulating, verifying to outage probability, macro base station is set
User's MUE quantity is that 40, secondary base station FBS quantity is 60.Figure 13 be under different FFR methods outage probability with signal-noise ratio threshold value
Changing trend diagram.As shown in figure 13, the outage probability of each method rises with the increase of signal-noise ratio threshold, using FBS frequency spectrums
The present invention (FFR6-R-F) after allocative decision optimization possesses minimum terminal probability, it was demonstrated that, can after using frequency spectrum distribution optimization
So that user performance is balanced and possesses compared with high s/n ratio.
Although illustrative embodiment of the invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the invention is not restricted to the scope of embodiment, to the common skill of the art
For art personnel, as long as various change is in the spirit and scope of the present invention that appended claim is limited and is determined, these
Change is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (2)
1. a kind of heterogeneous hierarchical LTE system fractional frequency reuse method based on intermediary's region optimizing, it is characterised in that including with
Lower step：
S1：Preliminary region division is carried out to macrocell area first, division methods are：In macrocell area, as needed will
Macrocell is divided into K sector, and K >=1 then will be with macrocell centre distance [0, r1] in the range of region be used as center
Domain, will be with macrocell centre distance in (r1,r2] in the range of region as intermediary region, remaining area as fringe region, draw
Get 3K sub-regions, wherein r1＜ r2＜ R, r1Central area radius is represented, is determined according to actual needs, r2Represent intermediary
Region outer radius, is required value, and R represents the radius of macrocell；
S2：Divided in advance according to the frequency spectrum that macro base station user MUE frequency spectrum distribution principle carries out macro base station user MUE in each sub-regions
Match somebody with somebody, frequency spectrum distribution principle is：Macro base station user MUE in the central area of K sector is used uniformly a subband, each sector
Intermediary region and fringe region in macro base station user MUE using subband, and with the intermediary of central area, adjacent sectors
Region is different with fringe region；
S3：The frequency spectrum predistribution of secondary base station FBS in each sub-regions is carried out according to secondary base station FBS frequency spectrum distribution principle,
Distribution principle is：Secondary base station FBS in the central area and intermediary region of each sector is used and the sector and adjacent sectors
Secondary base station FBS in subbands different interior macro base station user MUE, the fringe region of each sector is using the edge with the sector
Subband different macro base station user MUE in region；
S4：Determine that method determines intermediary region outer radius r using the optimal outer radius in intermediary region based on interference probe2It is optimal
Value, its specific method comprises the following steps：
S4.1：Cell pattern is built according to actual conditions, the macrocell area in step S1 is regard as the center of cell pattern
Cell, sets every cell pattern parameter, including channel model parameters, and according to step S1 to its in addition to macrocell area
He carries out region division at cell；
S4.2：The N number of secondary base of spaced set on the center line of the one of sector of macrocell area as center cell
User FUE stand as sensing point；
S4.3：Intermediary region outer radius r is set2=r1；
S4.4：Simulation times t=1 is set；
S4.5：Some macro base station user MUE and secondary base station FBS are generated by the way of spreading at random a little in cell pattern, are
Each secondary base station user FUE as sensing point configures a secondary base station FBS, according to step S2 and step S3 frequency spectrum point
Macro base station user MUE and secondary subband used in the FBS of base station are determined with principle；
S4.6：Emulation obtains the handling capacity of all macro base station user MUE and the secondary base station user as sensing point, and add up conduct
Throughput of system；
S4.7：Judge whether that t ＜ T, T represent Monte Carlo simulation number of times, if it is, into step S4.8, otherwise into step
S4.9；
S4.8：Make t=t+1, return to step S4.5；
S4.9：The average system throughput that T emulation is obtained is averaged, and it is corresponding that calculating obtains current intermediary's zone radius
Average system throughput；
S4.10：Make intermediary region outer radius r2=r2+Δr；
S4.11：Judge whether r2＞ R, if it is not, return to step S4.4, otherwise into step S4.12；
S4.12：Search obtains maximum from all average system throughputs, and corresponding intermediary region outer radius is area of intermediary
The optimal outer radius in domain；
S5：The optimal outer radius in intermediary region obtained according to step S4 completes the final division of macrocell area, each macro base station
User MUE subregions according to residing for its own position judgment, the frequency spectrum predistribution result in step S2 determines to use son
Band, each secondary base station FBS subregion according to residing for its own position judgment, the frequency spectrum predistribution result in step S3 is true
It is fixed to use subband.
2. heterogeneous hierarchical LTE system fractional frequency reuse method according to claim 1, it is characterised in that the step
When secondary base station FBS carries out frequency spectrum distribution in S5, its optional subband set is first obtained according to distribution principle, it is tested and selects difference can
Select signal to noise ratio during subband, the subband that the maximum subband of selection signal to noise ratio is used as it.
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