CN107205236A - A kind of fairness method for improving that Cellular Networks load balancing is relayed applied to minizone - Google Patents
A kind of fairness method for improving that Cellular Networks load balancing is relayed applied to minizone Download PDFInfo
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- CN107205236A CN107205236A CN201710367243.2A CN201710367243A CN107205236A CN 107205236 A CN107205236 A CN 107205236A CN 201710367243 A CN201710367243 A CN 201710367243A CN 107205236 A CN107205236 A CN 107205236A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- 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 discloses a kind of fairness method for improving that Cellular Networks load balancing is relayed applied to minizone, cellular cell, shared relay station will be overloaded and adjacent cells constitute the architecture of a resource allocation and communications around it；Divided with reference to frequency spectrum and the minizone relay-model of time slot division realizes load transfer, reallocated by the scheduling scheme sub-carrier based on distance weighting, the covering optimal radius of each relaying is determined according to neighbor cell different loads.In the system of cellular cell, one is set between two neighbor cells based on the shared relaying load balancing scheme of frequency spectrum time slot partitioning model, and the subcarrier redistribution algorithm based on distance weighting and the optimization scheme of minizone relaying covering radius are designed on this basis, cell system resource utilization and the overall user fairness of cellular cell system can be lifted.
Description
Technical field
The invention belongs to communication technical field, more particularly to a kind of public affairs that Cellular Networks load balancing is relayed applied to minizone
Levelling method for improving.
Background technology
Adjusted because orthogonal frequency-time multiple access technology (OFDMA) uses OFDM (OFDM) in Intra-cell
Technology processed, effectively eliminates intersymbol interference (ISI), it is to avoid intra-cell interference.However, in OFDMA radio honeycomb communication systems
In, different districts use identical frequency spectrum resource, generate serious inter-cell interference (ICI).Especially in cell edge
User, its service quality (QoS) is severely impacted.In the prior art load transfer is carried out using simple handover between cells
System interference lifting system resource utilization can not be reduced well, needed a kind of mode badly at present and overcome present cellular network system
Load distribution is unbalanced in system, low carrier resource utilization rate and the problem of low system fairness.
A kind of cooperation communication system resource allocation methods (application number optimal based on efficiency：201610662327.4), bag
Include step：System model is set up, system scenarios analysis, problem sums up, and optimization problem is solved using convex optimization method.The present invention
The consideration time averagely under system energy efficiency, current system performance is not only considered based on time averaging efficiency algorithm, while ought
Systematic function is taken into account the moment before the preceding moment, it is ensured that the fairness of system resource allocation, and provides the number of user fairness
Expression formula is learned, while simpler power sub-carriers self-adjusted block formula can dexterously be obtained by computing.
Towards LTE-A relaying orientation arrangement joint frequency dividing multiplexing method (application number：201410198834.8), using calmly
To the directionality of antenna, the availability of frequency spectrum of system is improved, according to the direction of relaying directional aerial and angle configurations joint spectrum
The co-channel interference of in allocative decision, reduction cell and minizone, interfering between control relay station and macrocell base stations carries
High systematic function.
Used between the problem of above-mentioned technical proposal does not solve cellular system load balancing and cellular cell and in cell
Family fairness problem.
The content of the invention
For above-mentioned technical problem, the present invention proposes a kind of fairness that Cellular Networks load balancing is relayed applied to minizone
Method for improving, sets one based on the shared relaying of frequency spectrum time slot partitioning model in the system of cellular cell, between two neighbor cells
Load balancing scheme, and the subcarrier redistribution algorithm based on distance weighting and minizone relaying covering half are designed on this basis
The optimization scheme in footpath, lifting cell system resource utilization and the overall user fairness of cellular cell system.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：One kind is applied to minizone relaying Cellular Networks load
Fairness method for improving, will overload cellular cell, shared relay station and six adjacent cells is constituted around it in a balanced way
The structural system of one resource allocation and communications.Cellular basestation collects the load information of respective cell, calculates carrier wave demand,
Shared relay station is coordinated to coordinate the transfer of overload cell edge user.In the system of cellular cell, the channeling of use
The factor is 1, and frequency reuse mode is 1*6*6, and cellular cell is approximately 6 side shapes, is divided into 6 sectors, diverse location sector
Interior user uses the subcarrier of different carrier sets.In whole design method, two parts are broadly divided into：One is that will overload honeycomb
Cell, shared relay station and six adjacent cells constitute the system knot of a resource allocations and communications around it
Structure.Two be to combine frequency spectrum to divide and time slot division determination interference model, is determined according to user in cell with serving BS distance
Weight of reallocating and neighboring cell loading amount determine relaying prioritization scheme, with sufficiently and reasonably lifting system fairness.
Illustrated below with OFDMA cellular system downlink scenarios：
Primary variables and its definition：
RBS：Cellular cell BS covering radius
β：The path loss index of cellular system link
r：Distances of the targeted customer MS to its serving BS
ri：Targeted customer MS to i-th neighbor cell base station BS distance
w：Subcarrier bandwidth
Rreq：The minimum data rate of user's request
PBS：Cellular cell BS transimission power
sloti：Represent i-th of time slot
Represent wanted to interfering signal ratios of the link link in i-th of time slot of time slot.
Represent the remaining sub-carrier number in BS regions.
Represent the remaining sub-carrier number in RS regions.
Wi：Represent the load of i-th of cell.
Represent the expectation of i-th of neighbor cell call speed.
E(RT)：Represent the expectation of target overloaded cells call speed.
Represent relaying covering radius
Will overload cellular cell, shared relay station and adjacent cells one resource allocation of composition and communication around it
The architecture of transmission；Divided with reference to frequency spectrum and minizone relay-model that time slot is divided realize load transfer, by based on away from
Scheduling scheme sub-carrier from weight is reallocated, and the covering of each relaying optimal half is determined according to neighbor cell different loads
Footpath.Set frequency spectrum to divide and time slot partitioning model, be specially：
1) in the downlink transfer model of system, each transmission frame is divided into two time slots, to neighbor cell, in time slot one
When, it is that base station BS relays RS relay transmission and BS to user MS direct-connected transmission to minizone, is RS to MS in time slot two
Relay transmission；To Target cell, two time slots are BS to MS direct-connected transmission.
2) frequency reuse mode is 1*6*6, and multiplexing factor is 1 frequency spectrum splitting scheme, and total carrier wave is divided into 6 differences
Subcarrier collection, each cell is divided into the sector of 6 homalographics, a set of subcarrier collection, cell is respectively adopted in each sector
The sector of interior same position uses the subcarrier collection used in identical subcarrier collection, relay area to come from correspondence nearest neighbor
The sector of cell.
Afterwards, perform according to the following steps：
Step 1：Cellular basestation collects the load information of respective cell, calculates carrier wave demand；
If no more than threshold value, directly carrying out subcarrier distribution；
If more than threshold value, performing step 2；
Step 2：The different loads situation of time slot and each neighbor cell is covered to different relayings according to residing for cellular system
Lid radius is optimized；
Step 3：Load transfer, calculates subcarrier demand, carries out just sub-distribution；
Step 4：After load transfer, each region subcarrier remainder is calculated respectively, the subcarrier distribution based on distance weighting
Algorithm carries out subcarrier reallocation；
Step 5：Load balancing, which is performed, terminates rear cellular basestation layer renewal load information, and return to step 1.
Following steps are specifically included in step 1：When first time slot of call request is initial, cellular basestation layer calculates every
Individual call meets minimum speed limit requirement RreqSub-carrier number；And respective range is integrated obtains all users in current area
Required total sub-carrier number, then carries out subcarrier predistribution.
Wanted to interfering signal ratios of the link link in i-th of time slot of time slot is calculated, each talking link link is calculated full in different time-gap
Sufficient minimum speed limit requires RreqSub-carrier number：
Preferably, threshold value is the 90% of maximum sub-carrier number.
Following steps are specifically included in step 2：When calculating the optimal value of relaying covering radius, covered for i-th of relaying
The load W of region, its available subcarrier and i-th of neighbor celliIt is related.As the load W of Target cell0When known, relaying covering
Radius isWhen meeting following constraints, make the variance of the average talk speed of each minizone in the system of cellular cell minimum
When, corresponding relaying covering radius value is optimal value.
Following steps are specifically included in step 3：Divided based on frequency spectrum and time slot partition strategy, by different points in overloaded cells
The edge customer in area carries out load transfer by shared relay station to the light load neighbor cell of correspondence, the user after transfer with it is right
Answer the nearest subregion of neighbor cell to share a set of carrier set, according to disturbed condition, calculate subcarrier demand, carry out subcarrier first
Distribution.
Following steps are specifically included in step 4：After load transfer, each region subcarrier remainder is calculated respectivelyWithSubcarrier Allocation Algorithm based on distance weighting carries out subcarrier reallocation；
Redistribution algorithm based on distance weighting is specially：For BS regions, by each MS to its serving BS BS distanceWith all MS to the BS in the region always apart from DTRatio be used as fairness index；For RS regions, by each MS to relaying RS's
DistanceFairness index is used as with the ratio of all MS to RS total distance in the region.Each MS obtains reassigned sub-carriers number
For fairness index corresponding region subcarrier remainder.
Obtain the fairness index based on distance and obtain reallocation resource be：
BS regions：Fairness index：Reallocation resource：
RS regions：Fairness index：Reallocation resource：
When certain MS obtains total sub-carrier number kiWhen determining, its speed of conversing can be calculated by following formula (4)：
The invention has the advantages that：The present invention uses multiplexing factor for 1, and frequency reuse mode is 1*6*6 frequency
Rate slot model reduces system interference, according to system spare sub-carrier resources after load carry out by distance weighting subcarrier again
Distribute to lift justice in cell, determine the covering optimal radius of each relaying according to neighbor cell different loads to lift minizone
Fairness.Overcome in present beehive network system that load distribution is unbalanced, carrier resource utilization rate is low and system fairness is low
Problem.
Brief description of the drawings
Fig. 1 sets schematic diagram for the shared relay station of the embodiment of the present invention.
Fig. 2 is the frequency spectrum partitioning model schematic diagram of the embodiment of the present invention.
Fig. 3 is the time slot partitioning model schematic diagram of the embodiment of the present invention.
Fig. 4 is the fairness method for improving flow that minizone relays Cellular Networks load balancing that is applied to of the embodiment of the present invention
Figure.
Embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to embodiment and accompanying drawing
It is bright.
Embodiment：Will overload cellular cell, shared relay station and six adjacent cells compositions, one money around it
Source distribution and the architecture of communications, are divided then in conjunction with frequency spectrum and the minizone relay-model of time slot division realizes load
Transfer, is reallocated by the scheduling scheme sub-carrier based on distance weighting, relays covering radius to carry by optimization
Rise system fairness.
Adjacent first in minizone sets shared relay station, is illustrated in fig. 1 shown below.Assuming that the covering of each cellular cell
Radius RBSFor 100m.The number of users of Target cell is respectively 40,35,30,25,20,15 for the number of users of 74,6 neighbor cells,
And each cell is uniformly distributed.The total sub-carrier number K of cell is 512, and subcarrier bandwidth w is 30KHZ, and path loss index β is 2.
The basic data rate R of each user's requestreqFor 256Kbps.
Secondly will overload cellular cell, shared relay station and six adjacent cells composition one resources point around it
Match somebody with somebody and communications basic architecture.Setting frequency spectrum as shown in figure 2 above and Fig. 3 is divided and time slot partitioning model, specifically
For：
1) in the downlink transfer model of system, each transmission frame is divided into two time slots, to neighbor cell, in time slot one
When, it is that base station BS relays RS relay transmission and BS to user MS direct-connected transmission to minizone, is RS to MS in time slot two
Relay transmission；To Target cell, two time slots are BS to MS direct-connected transmission.
2) frequency reuse mode is 1*6*6, and multiplexing factor is 1 frequency spectrum splitting scheme, and total carrier wave is divided into 6 differences
Subcarrier collection, each cell is divided into the sector of 6 homalographics, a set of subcarrier collection, cell is respectively adopted in each sector
The sector of interior same position uses the subcarrier collection used in identical subcarrier collection, relay area to come from correspondence nearest neighbor
The sector of cell.
Afterwards, the flow chart shown in reference picture 4, is performed according to the following steps：
Step 1：When first time slot of call request is initial, cellular basestation layer calculates each according to formula (1), (2)
Call meets minimum speed limit requirement RreqSub-carrier number, and respective range be integrated obtain all user institutes in current area
Total sub-carrier number of demand, then carries out subcarrier predistribution, judges whether to exceed threshold value, threshold value is maximum sub-carrier number
90%.It is computed exceeding threshold value, then performs step 2.
Calculate each talking link link and meet minimum speed limit requirement R in different time-gapreqSub-carrier number：
Calculate wanted to interfering signal ratios of the link link in i-th of time slot of time slot：
Step 2：The different loads situation of time slot and each neighbor cell is covered to different relayings according to residing for cellular system
Lid radius is optimized, and performs step 3.
When calculating the optimal value of relaying covering radius, for i-th of relaying overlay area, its available subcarrier and i-th
The load W of neighbor celliIt is related.As the load W of Target cell0When known, relaying covering radius isWhen satisfaction is following about
Beam condition, when making the variance of the average talk speed of each minizone in the system of cellular cell minimum, corresponding relaying covering half
Footpath value is optimal value.According to calculating, now the value of 6 relayings is respectively 20,23,27,33,41,43.
Step 3：Divided based on frequency spectrum and time slot partition strategy, the edge customer of different subregions in overloaded cells is passed through altogether
Enjoy relay station and carry out load transfer to corresponding light load neighbor cell, the user after transfer divides recently with corresponding neighbor cell
Area shares a set of carrier set, according to disturbed condition, calculates subcarrier demand, carries out subcarrier just sub-distribution, performs step 4；
Step 4：After load transfer, each region subcarrier remainder is calculated respectivelyWithBased on distance power
The Subcarrier Allocation Algorithm of weight carries out subcarrier reallocation, and step 5 is performed afterwards；
Redistribution algorithm based on distance weighting is specially：For BS regions, by each MS to its serving BS BS distanceWith all MS to the BS in the region always apart from DTRatio be used as fairness index；For RS regions, by each MS to relaying RS's
DistanceFairness index is used as with the ratio of all MS to RS total distance in the region.Each MS obtains reassigned sub-carriers number
For fairness index corresponding region subcarrier remainder.
Obtain the fairness index based on distance and obtain reallocation resource be：
BS regions：Fairness index：Reallocation resource：
RS regions：Fairness index：Reallocation resource：
When certain MS obtains total sub-carrier number kiWhen determining, its speed of conversing can be calculated by following formula (4).
Finally, and by RS optimal radius 20,23,27,33,41,43, the average throughput that can obtain each neighbor cell is basic
Between 523Kbps to 574Kbps, fairness is protected between making system cell.And each sector average talk speed in cell
The variance of rate is floated between being in 7 to 28, and the user fairness in this explanation cell has also obtained preferable satisfaction.
Step 5：Load balancing, which is performed, terminates rear cellular basestation layer renewal load information, and return to step 1.
The technological thought of embodiment above only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is all
It is any change done on the basis of technical scheme according to technological thought proposed by the present invention, each falls within present invention protection model
Within enclosing.The technology that the present invention is not directed to can be realized by existing technology.
Claims (8)
1. a kind of fairness method for improving that Cellular Networks load balancing is relayed applied to minizone, it is characterised in that：
Will overload cellular cell, shared relay station and adjacent cells one resource allocation of composition and communications around it
Architecture；
Divided with reference to frequency spectrum and the minizone relay-model of time slot division realizes load transfer, pass through the scheduling based on distance weighting
Scheme sub-carrier is reallocated, and the covering optimal radius of each relaying is determined according to neighbor cell different loads.
2. the fairness method for improving according to claim 1 that Cellular Networks load balancing is relayed applied to minizone, it is special
Levy and be, set frequency spectrum to divide and time slot partitioning model, be specially：
In the downlink transfer model of system, each transmission frame is divided into two time slots, to neighbor cell, is in time slot for the moment
Base station BS relays RS relay transmission and BS to user MS direct-connected transmission to minizone, in time slot two, in being RS to MS
After transmission；To Target cell, two time slots are BS to MS direct-connected transmission；
Frequency reuse mode is 1*6*6, and multiplexing factor is 1 frequency spectrum splitting scheme, and total carrier wave is divided into 6 different sons carries
Ripple collection, each cell is divided into the sector of 6 homalographics, and each sector is respectively adopted identical in a set of subcarrier collection, cell
The sector of position uses the subcarrier collection used in identical subcarrier collection, relay area to come from correspondence nearest neighbor cell
Sector.
3. the fairness method for improving according to claim 1 or 2 that Cellular Networks load balancing is relayed applied to minizone, its
It is characterised by：
Step 1：Cellular basestation collects the load information of respective cell, calculates carrier wave demand；
If no more than threshold value, directly carrying out subcarrier distribution；
If more than threshold value, performing step 2；
Step 2：Covering half of the different loads situation of time slot and each neighbor cell to different relayings according to residing for cellular system
Footpath is optimized；
Step 3：Load transfer, calculates subcarrier demand, carries out just sub-distribution；
Step 4：After load transfer, each region subcarrier remainder, the Subcarrier Allocation Algorithm based on distance weighting are calculated respectively
Carry out subcarrier reallocation；
Step 5：Load balancing, which is performed, terminates rear cellular basestation layer renewal load information, and return to step 1.
4. the fairness method for improving according to claim 3 that Cellular Networks load balancing is relayed applied to minizone, it is special
Levy and be, specifically included in step 1：
When first time slot of call request is initial, cellular basestation layer calculates each call and meets minimum speed limit requirement Rreq's
Sub-carrier number；And respective range is integrated obtains the required total sub-carrier number of all users in current area, then carry out
Subcarrier is pre-allocated, and judges whether to exceed threshold value：
Wanted to interfering signal ratios of the link link in i-th of time slot of time slot is calculated, each talking link link is calculated and is met most in different time-gap
Low rate requires RreqSub-carrier number：
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In formula, β：The path loss index of cellular system link；r：Distances of the targeted customer MS to its serving BS；ri：Target
User MS to i-th neighbor cell base station BS distance；w：Subcarrier bandwidth；PBS：Cellular cell BS transimission power；sloti：
Represent i-th of time slot.
5. the fairness method for improving according to claim 4 that Cellular Networks load balancing is relayed applied to minizone, it is special
Levy and be：Threshold value is the 90% of maximum sub-carrier number.
6. the fairness method for improving according to claim 3 that Cellular Networks load balancing is relayed applied to minizone, it is special
Levy and be, specifically included in step 2：
When calculating the optimal value of relaying covering radius, for i-th of relaying overlay area, its available subcarrier is adjacent with i-th
The load W of celliIt is related；As the load W of Target cell0When known, relaying covering radius isBar is constrained as follows when meeting
Part, when making the variance of the average talk speed of each minizone in the system of cellular cell minimum, corresponding relaying covering radius value
For optimal value：
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Represent the expectation of i-th of neighbor cell call speed；E(RT)：Represent the phase of target overloaded cells call speed
Hope.
7. the fairness method for improving according to claim 3 that Cellular Networks load balancing is relayed applied to minizone, it is special
Levy and be, specifically included in step 3：
Based on frequency spectrum divide with time slot partition strategy, by the edge customer of different subregions in overloaded cells by shared relay station to
The light load neighbor cell of correspondence carries out load transfer, and the user after transfer shares a set of with the nearest subregion of corresponding neighbor cell
Carrier set, according to disturbed condition, calculates subcarrier demand, carries out subcarrier just sub-distribution.
8. the fairness method for improving according to claim 3 that Cellular Networks load balancing is relayed applied to minizone, it is special
Levy and be, specifically included in step 4：
Redistribution algorithm based on distance weighting is specially：For BS regions, by each MS to its serving BS BS distanceWith
All MS to the BS in the region always apart from DTRatio be used as fairness index；For RS regions, by each MS to relaying RS distanceFairness index is used as with the ratio of all MS to RS total distance in the region.Each MS obtains reassigned sub-carriers number, public
Flat factor corresponding region subcarrier remainder.
Obtain the fairness index based on distance and obtain reallocation resource be：
BS regions：Fairness index：Reallocation resource：
RS regions：Fairness index：Reallocation resource：
When certain MS obtains total sub-carrier number kiWhen determining, its speed of conversing can be calculated by following formula (4)：
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<msub>
<mi>R</mi>
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<msub>
<mi>k</mi>
<mi>i</mi>
</msub>
<mo>&CenterDot;</mo>
<mi>w</mi>
<mo>&CenterDot;</mo>
<mi>l</mi>
<mi>o</mi>
<mi>g</mi>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>+</mo>
<msubsup>
<mi>SIR</mi>
<mrow>
<mi>l</mi>
<mi>i</mi>
<mi>n</mi>
<mi>k</mi>
</mrow>
<mrow>
<msup>
<mi>slot</mi>
<mi>i</mi>
</msup>
</mrow>
</msubsup>
<mo>)</mo>
</mrow>
<mo>-</mo>
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<mrow>
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<mn>4</mn>
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</mrow>
</mrow>
The remaining sub-carrier number in BS regions is represented,The remaining sub-carrier number in RS regions is represented,Table
Show wanted to interfering signal ratios of the link link in i-th of time slot of time slot.
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| US11800382B1 (en) | 2021-09-08 | 2023-10-24 | T-Mobile Usa, Inc. | Coverage improvement for 5G new radio wireless communication network |
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