CN102378185B - Dynamic spectrum sharing (DSS) method used in multi-cell heterogeneous network (Het-Net) - Google Patents

Dynamic spectrum sharing (DSS) method used in multi-cell heterogeneous network (Het-Net) Download PDF

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CN102378185B
CN102378185B CN201110314030.6A CN201110314030A CN102378185B CN 102378185 B CN102378185 B CN 102378185B CN 201110314030 A CN201110314030 A CN 201110314030A CN 102378185 B CN102378185 B CN 102378185B
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macro
community
pico
frequency
base station
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CN102378185A (en
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费泽松
李猛
李军龙
高巍
李娜
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Beijing Institute of Technology BIT
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Abstract

The invention discloses a dynamic spectrum sharing (DSS) method used in a multi-cell heterogeneous network (Het-Net), and belongs to the field of wireless communications. The method comprises the following steps of: dividing each Macro cell into four parts such as one Macro cell inner ring and three Macro cell outer rings, wherein, the three Macro cell outer rings can only use a designated frequency band part, and the Macro cell inner ring can use the frequency bands which are not used by all the Macro cell outer rings; reclassifying Pico cells, wherein, central Pico cells can reuse all uplink frequency bands of the Macro cells only by a TDD (Time Division Duplexing) mode, and edge Pico cells can reuse all the uplink frequency bands of the Macro cells or a downlink frequency band corresponding to an area D by the TDD mode; and averagely allocating available resource in each sector to each CMUE (central Macro user (UE)), EMUE (Edge Macro UE) and PUE (Pico UE) in the sector. The DSS method used in the multi-cell Het-Net has the beneficial effects of obviously improving the communication quality of cell-edge UEs (CEUs), solving the difficulty in a frequency reuse mode between the Macro cells and the Pico cells to a certain extent, and realizing coordination of interference between the Macro cells and the Pico cells.

Description

Dynamic spectrum in the heterogeneous network of a kind of many communities is shared method
Technical field
The present invention relates to a kind of frequency spectrum sharing method that is applicable to many communities heterogeneous network, be specifically related to a kind of dynamic spectrum that promotes Cell Edge User communication quality and system spectrum utilance and share method.Belong to wireless communication field.
Background technology
The sustainable growth of radio communication service demand, user (UE, user) is more and more higher for the requirement of mobile communication transmission speed.In order effectively to address this problem, the concept of heterogeneous network (Het-Net, Heterogeneous Network) is proposed in the follow-up evolution LTE-Advanced of Long Term Evolution (LTE, Long Term Evolution) technology.Heterogeneous network is exactly the hybrid network of disposing low power nodes in conventional cell, and the conventional cell is here grand (Macro) community in the present invention, low power nodes is micro-(Pico) community.The use of Pico node obviously strengthens the speed of hot spot region and coverage effect.But wireless communication system still can not meet the demand of radio spectrum resources.Research shows: the rare of frequency spectrum is not the inadequate of frequency spectrum resource itself, but caused by fixed frequency spectrum management mode.In recent years, proposed a lot of improved technology in order fully to excavate frequency spectrum resource, but in the long run, it is to improve the basic method of the availability of frequency spectrum that dynamic spectrum is shared (DSS, Dynamic Spectrum Sharing) technology.Brief analysis has been carried out in the interference that the scholars such as Wan Lei exist in to DSS system in " Heterogeneous Network in LTE-Advanced System ".The explanation of DSS system principle, Macro cellular downlink can not produce and disturb Pico system (Pico base station and Pico user), and in up link, interference to Pico user of the interference of Macro user to Pico base station, Macro user and Macro base station, adjacent area edge Macro user's interference still cannot overcome.Wherein, adjacent area Macro base station edge user disturbs and can not be ignored.And partial frequency multiplexing (FFR, Fractional Frequency Reuse) mode is considered to be in worldwide interoperability for microwave access (WiMAX, Worldwide Interoperability for Microwave Access) and LTE network and solves edge customer interference problem effective method the most.The scholars such as Chun Nie have proposed the frequency reuse plan based on FFR in a kind of OFDMA of being applied to system in article " Interference Management using Frequency Planning in an OFDMA based Wireless Network "; The scholars such as Suzan M.Shukry have also proposed the frequency reuse plan based on FFR in a kind of IEEE of being applied to 802.16e system at article " Adaptive Fractional Frequency Reuse (AFFR) scheme for multi-cell IEEE 802.16e systems ".By simulating, verifying, these the two kinds different frequency multiplexing schemes based on FFR can promote well the SINR of Cell Edge User in OFDMA system and IEEE 802.16e system.
At present, different separately although dynamic spectrum technology of sharing and partial frequency multiplexing technology all have advantages of, also there is no a kind of scheme by the two advantages, and for the design of many communities heterogeneous network.First the present invention has proposed a kind of DSS system that is applied to many communities heterogeneous network, and partial frequency multiplexing technology is applied in DSS system, this improved DSS system can effectively solve DSS system small area edge customer and be disturbed serious problem, and solve to a certain extent the difficult point of Macro and Pico minizone frequency multiplexing mode, the availability of frequency spectrum of system is significantly improved.
Summary of the invention
Be disturbed serious problem for current heterogeneous network intermediate frequency spectrum utilance is lower with Cell Edge User, the present invention proposes a kind of change under the prerequisite of network integral layout, improve the system design scheme of the availability of frequency spectrum and Cell Edge User communication quality.
For achieving the above object, the inventive method comprises the steps:
Wherein Macro community refers to the macrocell in heterogeneous network, the Microcell of Pico community finger low-power node.
Step 1, by little each Macro four parts that are distinguished into: ring D and 3 Macro community outer shroud A, B, C in 1 Macro community.Wherein in Macro community, definite method of ring D is: centered by this Macro base station, determine the covering radius of Macro base station to terminal according to the transmitting power of Macro base station, the border circular areas covering is the coverage of ring D in Macro community.Macro community outer shroud is for removing the Macro community remainder beyond interior ring D, and this part is divided into equal and opposite in direction, three parts that shape is identical, formed Macro community outer shroud A, B, C;
Wherein outer region, 3 Macro communities is used respectively the frequency range of appointment, and in Macro community, ring D can use the untapped frequency range of all Macro community outer shroud;
The designation method of the frequency range that wherein 3 Macro community outer shrouds use is: according to the quantity of user in the outer shroud of Macro community, type service, service quality, need the information such as the degree improved, determine three Macro community outer shroud A, B, C shared ratio in whole available frequency resources, and obtain their spendable frequency ranges;
Step 2, reclassifies Pico community: if Pico community is positioned at Macro community endocyclic area D, be classified as center P ico, if Pico community is positioned at outer region, Macro community (A, B or C), be classified as edge Pico; Center P ico only adopts time division duplex (TDD, Time Division Duplexing) all uplink bands in mode Macro community, multiplexing its place, and edge Pico adopts all uplink bands in mode Macro community, multiplexing its place of TDD, or the band downlink of Macro community endocyclic area D use;
Step 3, UE is classified: to each UE, the received power in assigned frequency band internal reference signals from the Macro base station in Macro of living in community and Pico base station of measuring respectively that it receives, then these sizes from the received power of different base station relatively.If the maximum power that this UE receives, from Pico base station, is so just classified as this UE Pico UE (referred to as PUE), otherwise is classified as Macro UE (referred to as MUE);
Step 4, classifies to MUE: if MUE is positioned at Macro community endocyclic area, be classified as center MUE (referred to as CMUE), if MUE is positioned at outer region, Macro community, be classified as edge MUE (referred to as EMUE);
Step 5, the frequency allocation result realizing according to step 1, be averagely allocated to the each CMUE in this region by encircling the operable frequency resource of D in each Macro community, by each Macro community outer region A, B, the spendable frequency resource of C is averagely allocated to respectively the each EMUE in corresponding outer region.Be arranged in the PUE of center P ico only with multiplexing up all frequency resources, and the PUE that is arranged in edge Pico described in step 2 both can multiplexing up all frequency resources, can also use the downstream frequency resource that in Macro community, ring D can use.
Compared with prior art, beneficial effect of the present invention is:
The present invention is directed to the lower and Cell Edge User of current heterogeneous network intermediate frequency spectrum utilance and be disturbed serious problem, the system design scheme proposing is without the integral layout that changes network, only need to adjust the watt level of Macro base station end, Pico base station end and UE end, just can significantly improve the communication quality of Cell Edge User, solve to a certain extent the difficult point of Macro and Pico minizone frequency multiplexing mode, coordinate the interference of Macro and Pico minizone simultaneously.
In the DSS system of the present invention's design, do not overlap with edge Pico owing to encircling coverage (can effectively control by adjusting transmitting power) in Macro, therefore Pico community in edge can be used the whole uplink bands in Macro community; According to DSS system principle, Pico community, edge can also be used the band downlink of ring in Macro community.Hence one can see that, and the available resources of Pico increase to some extent.
Brief description of the drawings
Fig. 1 is the DSS system principle diagram that the present invention proposes; Wherein, figure (a) is DSS system schematic, and figure (b) is the frequency resource service condition of Macro community and Pico community;
Fig. 2 is the main interference scene in the DSS system that proposes of the present invention;
The DSS system principle diagram that Fig. 3 designs for the present invention;
In the DSS system that Fig. 4 designs for the present invention, the resource of Macro community and Pico community is distributed and actual service condition.Wherein, figure (a) be that in Macro community, resource is distributed and actual service condition, and scheming (b) is that Macro community and Pico community are respectively in uplink time T uLwith downlink transfer time T dLinterior frequency use condition;
Fig. 5 is disturbed situation for the DSS system edges user that the present invention designs;
The cumulative distribution function of the DSS system Macro user SINR that Fig. 6 designs for the present invention, the SINR value (unit: dB) that its abscissa is user;
The cumulative distribution function of the DSS system Macro user spectrum efficiency that Fig. 7 designs for the present invention, the spectrum efficiency (unit: b/s/Hz) that its abscissa is Macro user;
The DSS system Pico user spectrum efficiency cumulative distribution function that Fig. 8 designs for the present invention, the spectrum efficiency (unit: b/s/Hz) that its abscissa is Pico user.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail, also technical problem and beneficial effect that technical solution of the present invention solves have been narrated simultaneously, it is pointed out that described embodiment is only intended to be convenient to the understanding of the present invention, and it is not played to any restriction effect.
A kind of dynamic spectrum technology of sharing combining with FFR technology described in the technical program, mainly solves heterogeneous network small area, many communities edge customer and is disturbed seriously, and the lower problem of the availability of frequency spectrum.The present invention shares (DSS by introducing dynamic spectrum, Dynamic Spectrum Sharing) technology, and be applied in the heterogeneous network of many communities after it is combined with partial frequency multiplexing technology, make improved systematic function have the advantage of dynamic spectrum technology of sharing and partial frequency multiplexing both techniques concurrently.Concrete steps are:
Little each Macro being distinguished in a Macro community encircled and three Macro community outer shroud four parts, three Macro community outer shrouds are only to use a part of frequency range of specifying, and in Macro community, ring can use the untapped frequency range of all Macro community outer shroud; Pico community is reclassified: be classified as center P ico by being positioned at the Pico community of encircling Macro community, the Pico community that is positioned at Macro community outer shroud is classified as to edge Pico; Center P ico is only with all uplink bands in the multiplexing Macro of mode community with TDD, and edge Pico not only can, with all uplink bands in the multiplexing Macro of mode community of TDD, can also use the band downlink that region D is corresponding; UE is classified: each UE is measured respectively and compares the size from the received power of different base station, be classified as Pico UE (PUE) receiving from the large UE of Pico cell power, other are classified as Macro UE (MUE); MUE is classified: be classified as center MUE (CMUE) by being positioned at the MUE encircling Macro community, the MUE that is positioned at Macro community outer shroud is classified as to edge MUE (EMUE); By the available resources average mark of each sector to each CMUE, EMUE and PUE in sector.The present invention has significantly improved the communication quality of Cell Edge User, has solved to a certain extent the difficult point of Macro and Pico minizone frequency multiplexing mode simultaneously, has coordinated the interference of Macro and Pico minizone.
Fig. 1 is the DSS system principle diagram that the present invention proposes.Wherein, figure (a) is DSS system principle diagram.In DSS system, Macro community adopts fdd mode, and Pico community adopts tdd mode, up (UL, UpLink) frequency resource that Pico community only can multiplexing Macro community.Figure (b) is frequency resource service condition, and Primary DL represents descending (DL, DownLink) frequency resource that Macro community is used, and PrimaryUL represents the upstream frequency resource that Macro community is used; Secondary UL/DL represents the upstream frequency resource of the multiplexing Macro of the mode community of Pico community TDD.Fig. 2 analyzes the main interference scene existing in this system of gained.In order to solve the interference that in Fig. 2, Macro Cell Edge User is subject to, promote the communication quality of Cell Edge User, the superperformance that simultaneously keeps DSS system to bring aspect spectrum efficiency, the present invention utilizes the DSS system shown in Fig. 3 to improve initial many communities heterogeneous network, and concrete steps are:
Step 1, region is divided.Regard each Macro community as a regular hexagon, and be divided into four parts: ring D and 3 Macro community outer region A, B, C in 1 Macro community.Wherein in Macro community, definite method of ring D is: centered by Macro base station, determine the covering radius of Macro base station to terminal according to the transmitting power of Macro base station, the border circular areas covering is the coverage of ring D in Macro community.Macro community outer shroud, for removing the cover part, Macro community beyond interior ring D, is on average divided into three parts by this part, has formed Macro community outer region A, B, C.
And then little each Macro being distinguished into encircled to D and three Macro community outer shroud A, B, C, four parts in a Macro community.
Wherein the distribution method of frequency resource is: the information such as the degree of improving according to the quantity of user in Macro community outer region A, B, C, type service, service quality, needs, determine region A, B, C shared ratio in whole frequency resource respectively, and obtain their spendable frequency ranges.For example, the UE quantity in the A of region is obviously more than the UE quantity in region B and region C, and in A, the ratio of UE quantity all UE quantity in region A, B, C is larger, therefore for region A distributes more frequency resource.But the quantity of UE can only be served as the reference factor that frequency is distributed in certain region, because the distribution of frequency is also subject to type service, service quality etc., other factors restrict.D spendable frequency range in region is untapped other all frequency ranges of region A, B, C.
Step 2, Pico reclassifies.The Pico community that is arranged in region D is classified as to center P ico; The Pico community that is arranged in region A, B, C is classified as to edge Pico.Center P ico is only with all uplink bands in the multiplexing Macro of mode community with TDD; And edge Pico not only can, with all uplink bands in the multiplexing Macro of mode community of TDD, can also use the band downlink that region D is corresponding.
Step 3, UE classification.According to the method for RSRP, to each UE, the received power in assigned frequency band internal reference signals from the Macro base station in Macro of living in community and Pico base station of measuring respectively that it receives, then these sizes from the received power of different base station relatively.If the maximum power that this UE receives, from Pico base station, is so just classified as this UE Pico UE (referred to as PUE), otherwise is classified as Macro UE (referred to as MUE).
Step 4, MUE reclassifies.The MUE that is arranged in A, B, tri-regions of C is classified as to edge MUE (referred to as EMUE); The MUE that is arranged in region D is classified as center MUE (referred to as CMUE).
Step 5, resource is distributed.By the available resources average mark of each sector to each CMUE, EMUE and PUE in sector.
The parameter of table 1 for using in this emulation, the setting of parameter value is based on 3GPP TR 36.814 standards.
Table 1
Parameter Arrange
Carrier frequency 2GHz
Bandwidth 10MHz
Distance between MBS 500 meters
MBS number
7
PBS number 3
MUE number in every Macro community 30
PUE number in every Pico community 6
MBS power 40W，10MHZ
Thermal noise -174dbm/Hz
Sub-carrier distribution manner Random mean allocation
MUE and MBS decline model PL＝128.1+37.6logR/1000
PUE and PBS decline model PL＝140.7+37.6logR/1000
PUE and the model that declines with frequency MUE PL＝140.7+37.6logR/1000
Shadow fading standard variance 8dB
Shadow fading correlation 0.5
PBS power 1W
MUE power 0.2W
In the DSS system of the present invention's design, the resource distribution of Macro community and Pico community and actual service condition are as shown in Figure 4.Wherein, figure (a) be that in Macro community, resource is distributed and actual service condition, frequency range A, B, C, D respectively correspondence the Macro community outer region A, B, C, the D that divide in Fig. 3.Frequency range, in assigning process, is set in D region and can uses whole frequency ranges, in A, B, C region only with use a part specify frequency range.But in actual use procedure, first by A, B, C region in they choice for use frequency ranges in spendable band limits separately, then determine the actual use frequency range in D region, be A, B, the untapped all residue frequency ranges in C region.It should be noted that A, B, tri-frequency ranges of C shared ratio in whole frequency resource, can according to its separately district's intra domain user quantity, type service, service quality, need the information such as degree of improving adjust.Figure (b) is that Macro community and Pico community are respectively in uplink time T uLwith downlink transfer time T dLinterior frequency use condition.In Macro community, adopt fdd mode, therefore, no matter be in uplink time T uLwith downlink transfer time T dLin, spendable frequency resource is all constant.In Pico community, in downlink transfer time T dLin, center P ico will produce great interference to user, thus be not its dividing frequency resource, and the coverage of the coverage of edge Pico and central area D does not have overlapping, be that edge Pico does not produce interference to D district intra domain user, therefore edge Pico can use the frequency range identical with region D; In uplink time T uLin, because the interference that system in Pico produces Macro base station can be ignored, therefore all Pico can use all frequency resources of the multiplexing Macro of the mode community of TDD.
In the DSS system of the present invention's design, the interference of Cell Edge User is the part for disturbing in former DSS system only.As shown in Figure 5, because outer region, Macro community is divided into three parts, and this three part uses different frequency resources, therefore Cell Edge User is only received the interference from respective sectors, adjacent Macro community, the interference signal receiving is only an original part.As the interference signal of edge customer in the 1st sector, Macro base station 1 only comes from the sector 1 of adjacent Macro base station.Neighbor base station has obviously reduced the interference of Macro Cell Edge User, and the communication quality of Cell Edge User has just obtained obvious improvement.In the present embodiment, effect of the present invention can further illustrate by following analogous diagram, and in figure, "-" represents the situation in traditional DSS system; Situation in the DSS system of " △ " expression employing FFR technological improvement:
As shown in Figure 6, the SINR of Macro Cell Edge User has obtained significant lifting, and this is mainly because the interference being subject to has reduced.As shown in Figure 7, the spectrum efficiency of Macro Cell Edge User is improved, and this is mainly because edge customer occupies the chance of RB resource have been increased, thereby the spectrum efficiency of edge customer is promoted to some extent.And as shown in Figure 8, Pico user's spectrum efficiency has obtained obvious lifting, be mainly because the available resources of Pico community have increased.According to encircling in DSS system principle and Macro, the fact that coverage and edge Pico do not overlap is known, and Pico community, edge not only can be used the whole uplink bands in Macro community, can also use the band downlink of ring in Macro community.The increase of Pico cell available resources, the chance that makes this district's intra domain user occupy RB resource has increased, thereby all users' spectrum efficiency is improved.
The above; it is only the specific embodiment of the present invention; but protection scope of the present invention is not limited to this; any people who is familiar with this technology is in the disclosed technical scope of the present invention; can understand conversion and the replacement expected; all should be encompassed in of the present invention comprise scope within, therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims (2)

  1. Dynamic spectrum in the heterogeneous network of 1.Yi Zhongduo community is shared method, comprises following steps:
    Step 1, by little each Macro four parts that are distinguished into: ring D and 3 Macro community outer shroud A, B, C in 1 Macro community; Wherein in Macro community, definite method of ring D is: centered by this Macro base station, determine the covering radius of Macro base station to terminal according to the transmitting power of Macro base station, the border circular areas covering is the coverage of ring D in Macro community; Macro community outer shroud is for removing the Macro community remainder beyond interior ring D, and this part is divided into equal and opposite in direction, three parts that shape is identical, formed Macro community outer shroud A, B, C;
    Wherein outer region, 3 Macro communities is used respectively the frequency range of appointment, and in Macro community, ring D can use the untapped frequency range of all Macro community outer shroud;
    Step 2, reclassifies Pico community: if Pico community is positioned at Macro community endocyclic area D, be classified as center P ico; If Pico community is positioned at outer region, Macro community, be classified as edge Pico; Center P ico only adopts all uplink bands in the mode of time division duplex Macro community, multiplexing its place, and edge Pico adopts all uplink bands in mode Macro community, multiplexing its place of time division duplex, or the band downlink of Macro community endocyclic area D use;
    Step 3, UE is classified: to each UE, the received power in assigned frequency band internal reference signals from the Macro base station in Macro of living in community and Pico base station of measuring respectively that it receives, then these sizes from the received power of different base station relatively; If the maximum power that this UE receives, from Pico base station, is so just classified as Pico UE by this UE, referred to as PUE, otherwise be classified as Macro UE, referred to as MUE;
    Step 4, classifies to MUE: if MUE is positioned at Macro community endocyclic area, be classified as center MUE, referred to as CMUE, if MUE is positioned at outer region, Macro community, be classified as edge MUE, referred to as EMUE;
    Step 5, the frequency allocation result realizing according to step 1, be averagely allocated to the each CMUE in this region by encircling the operable frequency resource of D in each Macro community, by each Macro community outer region A, B, the spendable frequency resource of C is averagely allocated to respectively the each EMUE in corresponding outer region; Be arranged in the PUE of center P ico only with multiplexing up all frequency resources, and the PUE that is arranged in edge Pico described in step 2 both can multiplexing up all frequency resources, can also use the downstream frequency resource that in Macro community, ring D can use.
  2. 2. the dynamic spectrum in the heterogeneous network of according to claim 1 a kind of many communities is shared method, it is characterized in that, the designation method of the frequency range that 3 Macro community outer shrouds described in step 1 use is: according to the quantity of user in the outer shroud of Macro community, type service, service quality, need the degree information improved, determine three Macro community outer shroud A, B, C shared ratio in whole available frequency resources, and obtain their spendable frequency ranges.
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US9264912B2 (en) * 2012-01-19 2016-02-16 Telefonaktiebolaget L M Ericsson (Publ) Fractional frequency re-use and beamforming in relay nodes of a heterogeneous network
CN103379497A (en) * 2012-04-27 2013-10-30 普天信息技术研究院有限公司 Interference coordination method for heterogeneous network
US9300395B2 (en) 2012-07-05 2016-03-29 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for carrier aggregation
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CN105007584A (en) * 2015-05-21 2015-10-28 西安电子科技大学 Macro cellular interference coordination method based on adaptive frequency reuse
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