CN104205908B - The method and apparatus for channeling and the network node for it in relay communications system - Google Patents
The method and apparatus for channeling and the network node for it in relay communications system Download PDFInfo
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- CN104205908B CN104205908B CN201280071946.6A CN201280071946A CN104205908B CN 104205908 B CN104205908 B CN 104205908B CN 201280071946 A CN201280071946 A CN 201280071946A CN 104205908 B CN104205908 B CN 104205908B
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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
- H04W16/12—Fixed resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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Abstract
Present disclose provides a kind of method and apparatus in relay communications system for channeling and the network node for it.This method can include：Transmitted for access link, system bandwidth is divided at least three frequency bands；And it is multiplexed from the base station that described at least three frequency band selections, one frequency band is used in all cells, other frequency bands by the via node in cell with the frequency duplex factor as one for being at least 2.Additionally, in backhaul link transmission, different frequency reuse plans can be used.In exemplary scenario, by via node as Cell Edge User, and system bandwidth can be divided at least the other three frequency band, one of described at least the other three frequency band is selected for the via node in serving cell, so that the frequency band for service relay node between two neighbor cells is macrocell user orthogonal, that other frequency bands at least the other three frequency band are used in serving cell.Using embodiments of the present invention, the interference that user's particularly Cell Edge User is undergone can significantly reduce, and thus their performance will be improved.In addition, the solution provided in the present invention has low-down complexity and Signalling Designing can be mutually compatible with current LTE standard.
Description
Technical field
Embodiments of the present invention relate generally to mobile communication technology field, and relate more specifically in trunking traffic
Method and apparatus for channeling and the network for it in system.
Background technology
Relaying technique is employed in third generation partner program senior long term evolution (3GPP LTE-A) technology.Relaying
It is that one kind handles and forwarded received signal thereby to expand radio covering and enhancing data throughput by via node
The technology of amount.Relaying technique can improve the covering of High Data Rate, group mobility, casual network deployment and cell edge
Handling capacity, and can be also used for providing the covering in new region.Using relaying technique, via node (RN) will be from base station
(eNB) two sections of preferable links of quality are divided into the direct link with poor quality of user equipment (UE), i.e. access chain
Road and back haul link, wherein access link refer to the link between RN and UE, and back haul link refers to the chain between eNB and RN
Road.
Via node is connected wirelessly to Radio Access Network via donor cell (that is, the cell for supporting relaying).On
The frequency spectrum of via node is used, and the work of via node can be divided into：
In-band, eNB-RN links and RN-UE link sharing identical carrier frequency in this case.In this case, Re1-
8 UE should be able to be connected to donor cell.
- band is outer, and eNB-RN links in RN-UE link identical carrier frequencies with not operating in this case.This
In the case of Re1-8 UE should be connectable to donor cell.
As is known, as " Class1 " via node defined in 3GPP TR36.814 V9.0.0 be with interior via node,
It is characterized in that：
It is controlled to cell, and each cell is the independent cells different from donor cell for UE；
- cell should have the physical district ID (being defined in LTE Re1-8) of themselves, and via node
Synchronizing channel, reference symbol of their own etc. should be transmitted.
- in the context of single subdistrict operation, UE directly should receive schedule information and HARQ feedback from via node, and
And its control channel (SR/CQI/ACK) is sent to via node；
- for Re1-8 UE, it should serve as Re1-8 eNB (that is, back compatible)；And
- be able to should be showed from Re1-8 eNB different for advanced LTE UE, via node, to allow further property
Can enhancing.
Above-mentioned " Class1 " via node is that and back haul link and access link will use identical with interior via node
Frequency band.Thus, link transmitter will cause interference on the receiver of their own.Therefore, while in same frequency resources hold
Row backhaul link transmission and access link transmission are infeasible, unless for example by specific, well-separated and well every
From antenna structure being adequately isolated for output signal and input signal be provided.
It is that operation relaying is make it that to assume that RN should be from it for solving a kind of possible solution of above-mentioned interference problem
Not to user device transmissions data when donor eNB (DeNB, supporting the eNB of relaying) receives data.In other words, in access link
" gap " is created in transmission.During these gaps, RN will not transmit any information to UE.These gaps can for example pass through
MBSFN (multicast and broadcast single frequency network) subframes are configured as shown in Figure 1 to create.As shown in figure 1, RN-UE transmission uses
Common subframe (such as illustrating in left side), and eNB-RN transmission uses MBSFN sub-frame (such as illustrating on right side).Between eNB and RN
Transmission by by not allowing the transmission in some subframes between RN and UE, will promote.Thus, one in downlink wireless frame
A little frame is configured for being the backhaul subframe transmitted from DeNB to RN, and other subframes are for the transmission from RN to UE
Access subframe.
However, the introducing of relaying technique can still produce new cell edge and introduce more interference, and thus require to hold
Row interference management or interference harmony are disturbed with mitigating.
Inter-cell interference harmony (ICIC) is processing inter-cell interference and improves the important of the bit rate at cell edge
One of technology.One of typical scenario is R1-050507 (" SoftFrequency Reuse Scheme for UTRAN
LTE, " 3 GPP RAN 1#41, the soft-frequency reuse (SFR) in 5 months 2005.Fig. 2 schematically shows the normal of three cell layouts
Advise SFR schemes.As Fig. 2 illustrates, in typical SFR schemes, system bandwidth is equally divided into three frequency bands, i.e., F1, F2 and
F3；For each cell in network, a frequency band will distribute to Cell Edge User, and other two frequency bands are used in cell
Central user, and the frequency band for distributing to Cell Edge User is orthogonal between each two neighbor cells.In addition,
Distribute at the frequency band of Cell Edge User, transimission power will be enlarged by.
Another minizone based on soft-frequency reuse (SFR) is provided in PCT Patent Publication WO2011/085513 to do
Harmony scheme is disturbed, the program is shown schematically in Fig. 3.According to this scheme, the UE in cell is classified as three types, i.e. via
The relaying UE of RN being serviceds, the edge UE directly serviced positioned at cell edge but by BS, and it is usually located at center of housing estate simultaneously
And the center UE serviced by BS.System bandwidth is divided into 4 frequency bands F1, F2, F3 and F4, and its midband F4 is assigned to all
BS for serving cell center UE；Its excess-three orthogonal frequency band F1, F2 and F3 are assigned to the cell to service other types
UE.For specific cell, if BS carrys out serving cell edge UE using one of its excess-three frequency band F1, F2 and F3,
RN can carry out service relay UE using one or both of other two frequency bands.
In order to mitigate the interference related to relaying, M.Peng, N.Yang, and W.Wang are in " On interference
coordination for directional decode-and-forward relay in TD-LTE systems”
In (Proceedings of IEEE Int.Conf.Commun. (ICC), Cape Town, South Africa, May 2010)
Propose directional relay topology.
" the Inter-cellinterference coordination based on soft frequency entitled
Reuse for relay enhanced cellular network " (J.Liu, D.Wang, J.Pang, J.Wang, and
The st Annual IEEE International Symposium on Personal of G.Shen, Proceedings of 21,
Indoor and Mobile, Radio Communications (PIMRC), 2010, pp.2304-2308) in article, also carry
A kind of similar soft-frequency reuse scheme is supplied, wherein RN will reuse neighbor cell edge band, so as to improve cell average throughput
The handling capacity of amount and cell edge UE.
In addition, K.Doppler, X.He, C.Wijting, and A.Sorri are in " Adaptive soft reuse for
relay enhanced cells”(Proceedings of IEEE 65th Vehicular Technology
Conference (VTC2007-Spring), April 2007, pp.758-762) article in, propose in addition a kind of adaptive
Provided for radio resources management scheme.In this scenario, it distributes to the power mask changed in a time domain or in a frequency domain each wireless
Access point (RAP), and thus soft resources segmentation support channeling 1, while, each RAP have can be used for scheduling use
The high power resource of the interference reduction of family terminal.
In addition, entitled " A novel frequency reuse scheme for OFDMA based relay
enhanced cellular networks”(Proceedings of IEEE 69th Vehicular Technology
Conference (VTC2009-Spring), April 2009, pp.1-5.M.Liang, F.Liu, Z.Chen, Y.F.Wang,
And D.C.Yang) article also disclose that a kind of frequency reuse plan, wherein whole cell is divided into two parts：It is internal
Region and perimeter.The two regions all independently utilize whole frequency band, i.e., frequency duplex factor as one is for each region
It is 1；In order to eliminate intra-cell interference, in base station and relaying using specific bandwidth assignment, directional aerial and power setting.
In addition, in article " A Self-Organized Resource Allocation using Inter-Cell
Interference Coordination (ICIC) in Relay-Assisted Cellular Networks " (M.Mehta,
O.G.Aliu, A.Karandikar, and M.A.Imran, ICTACT Journal on Communication
Technology, vol.2, no.2, pp.300-313, June2011) in propose a kind of self-organizing allocation plan of physical resources.At this
In article, interference neighbors group is introduced, to realize ICIC design by the Local Interaction between each entity.
Although having proposed so many ICIC schemes in this area, these schemes all do not account for backhaul and access subframe
Between disturbance situation.Therefore, there is a need in the art for a kind of new inter-cell interference harmony solution.
The content of the invention
Therefore, the present invention provides a kind of new ICIC solutions, to solve or mitigate at least in part existing skill
At least a portion problem in art.
According to the first aspect of the invention, there is provided a kind of method for channeling.This method may include：For connecing
Incoming link is transmitted, and system bandwidth is divided into at least three frequency bands；And used from described at least three frequency band selections, one frequency band
Base station in all cells, other frequency bands are multiplexed by the via node in cell with the frequency duplex factor as one for being at least 2.
In an embodiment of the invention, other frequency bands are equal in magnitude as shown in being multiplexed the via node.
In another embodiment of the present invention, for backhaul link transmission, it can use and be different from access link transmission
Soft-frequency reuse scheme.
In a further embodiment of the present invention, this method can also include：For backhaul link transmission, by system bandwidth
It is divided at least the other three frequency band；And it is used for from described one frequency band of at least the other three frequency band selection in serving cell
Via node, make it that the frequency band for service relay node between two neighbor cells is orthogonal, other frequency bands are used for
Central user in serving cell.
In another embodiment of the invention, in backhaul link transmission, for the one of service relay node
Transimission power on frequency band can be higher than the transimission power on the frequency band for serving macro-cell user.
In a further embodiment of the present invention, the excellent of user fairness for guarantee system effectiveness and is realized by performance objective
Change analysis operation, it is determined that for access link transmit in via node frequency band relative to system bandwidth ratio and be used for
It is used for the one of service relay node in transimission power and backhaul link transmission on other frequency bands of serving macro-cell user
The ratio between transimission power on individual frequency band.
In the still further embodiment of the present invention, via node can be deployed near cell edge.
According to the second aspect of the invention, there is provided a kind of equipment for channeling.The equipment may include：Frequency band is drawn
Sub-module and band selection module.The frequency band division module be can be configured to transmit for access link, and system bandwidth is drawn
It is divided at least three frequency bands.The band selection module can be configured to be used for from described at least three frequency band selections, one frequency band
Base station in all cells, other frequency bands are multiplexed by the via node in cell with the frequency duplex factor as one for being at least 2.
According to the third aspect of the invention we, there is provided a kind of network node of the equipment including according to second aspect.
According to the fourth aspect of the invention, there is provided a kind of to be deposited thereon including the computer-readable of computer program code
Storage media, the computer program code be configured to cause when executed the equipment perform according to first aspect any one
Action in the method for embodiment.
According to the fifth aspect of the invention, there is provided a kind of computer program product, it includes the meter according to fourth aspect
Calculation machine read/write memory medium.
Using embodiments of the present invention, the interference that user's particularly Cell Edge User is undergone can reduce, and
Thus their performance will improve.In addition, solution provided by the invention has low-down complexity and Signalling Designing
Can be compatible with current LTE standard.
Brief description of the drawings
By reference to each accompanying drawing explaining in detail to the embodiment that is shown in embodiment, of the invention is above and other
Feature will become clearer, and similar reference represents same or similar part all the time in accompanying drawing, and in accompanying drawing：
Fig. 1 schematically shows the diagram of example downlink subframe configurations；
Fig. 2 schematically shows the diagram of conventional soft-frequency reuse scheme；
Fig. 3 schematically shows the diagram of another soft-frequency reuse scheme of the prior art；
Fig. 4 schematically shows the diagram of the example interference model used in embodiments of the present invention；
Fig. 5 schematically shows the flow chart of the method for channeling according to an illustrative embodiment of the invention；
Fig. 6 A and 6B schematically show according to an illustrative embodiment of the invention exemplary during subframe is accessed
The diagram of frequency reuse plan；
Fig. 7 A to 7C schematically show the exemplary frequency for backhaul subframe according to an illustrative embodiment of the invention
The diagram of rate multiplexing scheme；
Fig. 8 schematically shows the interference for being used for RUE in access link transmission according to an illustrative embodiment of the invention
Diagram；
Fig. 9 schematically shows the block diagram of the equipment for channeling according to an illustrative embodiment of the invention；With
And
Figure 10 schematically shows conventional scheme and the emulation knot of solution according to an illustrative embodiment of the invention
Fruit.
Embodiment
Hereinafter, by refer to the attached drawing by embodiment be described in detail a kind of method and apparatus for channeling,
Network node.It should be understood that these embodiments are provided just for the sake of making those skilled in the art better understood when and real
The present invention is applied, and is not intended to the scope limiting the invention in any way.
Should be it is further noted that showing the present invention according to the particular order for performing method and step.However, these methods are simultaneously
It is non-to want strict and performed according to shown order, and they can the property based on correlation method step and performed by inverted sequence or
Person performs simultaneously.In addition, indefinite article " one/mono- " used herein is not excluded for multiple this steps, cell, device and right
As etc..
As described above, the disturbance regime during backhaul and access subframe is different, and this will be carried out in detail with reference to figure 4
Explain, the diagrammaticalIy shows the exemplary interference model used in the present invention, and is accessed in the figure in downlink
Desired signal during subframe and backhaul subframe is represented with solid line and long dotted line respectively, and is accessing subframe and backhaul subframe phase
Between interference signal represented respectively with short dash line and chain-dotted line.
As illustrated in fig. 4, during the backhaul subframe that long dotted line represents, DeNB can also be dispatched for directly being taken by DeNB
The grand UE (MUE) of business data, and RN is also at reception pattern, and thus interference in backhaul subframe only from eNB.Separately
On the one hand, during the access subframe that solid line represents, RN transmits the number for the trunk subscriber equipment (RUE) via RN being serviceds
According to while eNB also transmits the data for each MUE.In this case, interference in these access subframes from RN and
Both eNB.
In view of above-mentioned difference disturbance regime, in the present invention, there is provided a kind of new frequency reuse plan.Carry in the present invention
In the scheme gone out, it is assumed that all Cell Edge User are serviced by RN, and all Cell Center User are directly serviced by base station.
That is user is divided into two types：The edge customer serviced by RN, and the central user serviced by base station.The hypothesis
It is rational, because UE centered on original edge UE most probables are connected to via node, and then MUE is most possible.Therefore,
Preferably, if RN is deployed in cell edge nearby so that they are dedicated for serving cell edge cell.
In solution provided by the invention, based on disturbance regime difference to access backhaul link transmission and access chain
Road transmission uses different frequency multiplexing scheme.Specifically, for access link transmit, the frequency band that all eNB are used be it is fixed,
And via node frequency of use multiplexing factor x (x ＞ 2) is to carry out interference harmony.Each via node can be with a frequency domain
(1-x α) B, wherein B is used to represent system bandwidth, i.e., whole frequency bandwidth using α B and grand eNB, α is to be saved by a relaying
Point be used for access link transmission bandwidth share, i.e. for a via node frequency band relative to system bandwidth ratio.
In this way, in access link transmission, MUE only will be disturbed by eNB and RUE disturbs the via node only by 1/x.
Therefore, compared with eNB and via node all use the relay system of channeling 1 of whole frequency bandwidth, both MUE and RUE
Inter-cell interference is significantly reduced.
On the other hand, for backhaul link transmission, using different frequency multiplexing scheme.For example, via node can be recognized
It can be used for cell edge UE and traditional soft frequency multiplexing method.System bandwidth can also be divided into three frequency bands,
Preferably three equal frequency bands.One is used for cell edge transmission, i.e. is used by base station for service relay node；And
And other center of housing estate that are used for transmit, i.e. are used by base station for serving macro-cell user.Meanwhile it should ensure that adjacent at two
Frequency band between cell for service relay node is orthogonal.Additionally, the power for cell edge transmission can be higher than
For the power of center of housing estate transmission, this is favourable, because it will promote to improve transmission quality, and the transmission quality is usually
The bottleneck of multi-hop transmission in junction network.
Hereinafter, the illustrative embodiments of the present invention will be described in detail with reference to figure 5 to 9.
May be referred to Fig. 5 first, its schematically show according to an illustrative embodiment of the invention be used for channeling
Method flow chart.
As shown in figure 5, in step S501, transmitted for access link, system bandwidth is divided at least three frequency bands.
In embodiments of the present invention, transmitted for access link, system bandwidth is divided into x+1 frequency band, wherein x
At least 2.Although it is also optional to be divided into some different size of frequency bands, the x in preferably x+1 frequency band is phase
With size, i.e. the size of x frequency band is α B and remaining size is (1-x α) B.Parameter alpha can be according to any suitable
Predefine when mode determines, such as by testing, emulating or be empirical value.It is preferable, however, that will be by performing optimization point
Analysis is operated to determine the parameter, and this will hereinafter be described.
Afterwards, in step S502, used from described at least three frequency band selections, one frequency band for the base station in all cells,
And other frequency bands are multiplexed by the via node in cell, frequency duplex factor as one is at least 2.
At least three frequency bands size be α B, α B ..., (1-x α) B in the case of, size is (1-x α)
B frequency band can be fixed to the frequency band of all base station eNBs for the i.e. MUE of service centre user, and size is α B x
Individual frequency band can be distributed to for serving cell edge customer i.e. RUE via node.RN can use at least 2 channeling
The factor performs interference harmony.
Frequency duplex factor as one for example can be 2.This hypothesis is rational, because RN is very likely to the shape of similar circle
In the presence of, and generally RN uses the transimission power more than height.Therefore, if RN is deployed near cell edge, this can be
Preferably.
Fig. 6 A schematically show the example frequency during subframe is accessed according to an illustrative embodiment of the invention
The diagram of multiplexing scheme, wherein system bandwidth are divided into three frequency duplex factor as one between frequency band and RN as 2.In addition,
Fig. 6 B are shown to be distributed for access link transmission for frequencies of the eNB and RN for physical resource block (PRB).Such as Fig. 6 A
Illustrate with 6B, all eNB use the frequency band of same fixation, and the frequency band is (1-2 α) B, and the RN in each cell is replaceable
Ground uses other two frequency bands, and each size of the two frequency bands is α B.
On the other hand, for backhaul link transmission, it can use and be different from the soft-frequency reuse scheme that access link transmits.
In an embodiment of the invention, RN can be considered as Cell Edge User and use conventional soft-frequency reuse scheme.
Therefore, in step S503, for backhaul link transmission, system bandwidth can be divided at least the other three frequency band.Although institute
Different size can be had by stating three frequency bands, and they are preferably divided into the frequency band of three equal sizes.
, can be from described one frequency band of at least the other three frequency band selection, for eNB using to service then in step S504
RN in cell, other frequency bands are used with the central user MUE in serving cell by eNB.Meanwhile it should also ensure that for servicing RN
Frequency band be orthogonal between two neighbor cells.
Fig. 7 A schematically show the example frequency during backhaul subframe according to an illustrative embodiment of the invention
The diagram of multiplexing scheme, wherein system bandwidth are equally divided into three frequency bands.As illustrated, in cell A, B and C, eNB
Service band F1, F2 and F3 service its RN respectively, and eNB service bands F2+F3, F1+F3 and F1+F2 service MUE respectively.This
Outside, Fig. 7 B show that the frequency for PRB for RN and MUE for backhaul link transmission is distributed.
Because RN is seen as cell edge UE, and therefore they can have the signal intensity of higher reception.
That is the transimission power on a frequency band for servicing RN can be higher than on other band services for central user
Transimission power.Fig. 7 C show the power level for backhaul link transmission on different frequency bands in different districts.It is clear that
Power for cell edge transmission is higher than the power for central transmission.Center of housing estate transmits the power with cell edge transmission
Ratio, i.e. the transimission power on other frequency bands of service centre user services the transmission on a RN frequency band with being used for
Ratio between power can be defined as：ξ=PCCU/PCEU, wherein PCCUAnd PCEURespectively to center of housing estate UE and cell side
The power level that edge UE is used when transmitting.
Parameter ξ can determine by any-mode, such as by testing, emulate, or can be determined that empirical value etc..So
And, it is preferable that determine the parameter by performing optimization analysis operation.Then, by the illustrative embodiments with reference to the present invention
Exemplary optimized analysis operation is described.
In an exemplary embodiment of the present invention embodiment, parameter alpha and ξ, optimization point will be determined by performing optimization analysis operation
The target of analysis operation is guarantee system effectiveness and realizes user fairness.Hereinafter, the purpose in explanation, will be described two
Individual target describes to optimize analysis operation as example.It is presented it should be understood, however, that the target is merely exemplary, and this
Invention is not limited only to this.On the contrary, any other appropriate target, the maximization of such as systematic function or cell edge can be used
The maximization of user performance, supported for the QoS of different service types, or similar target.
In addition, hereinafter, carry out for simplicity of illustration it is assumed hereinafter that：In each during accessing subframe followed by
Between frequency duplex factor as one be 2 (x=2)；Backhaul subframe configuration is identical for all eNB；And UE is equal according to ring-type
It is distributed evenly.
Optimization aim
In order to realize system effectiveness and user fairness, there is provided be related to parameter alpha and ξ two instance object functions, the letter
Number is described below.
Firstly, for the first optimization aim, in order to ensure efficiency of transmission, it is expected that the transmittability of back haul link is equal to access
The transmittability of link.That is, following formulas can be obtained：
(formula 1)
Wherein QrnIndicate the Normalized throughput of RN in relay system；α is above-mentioned bandwidth scale parameter, i.e. relaying section
The share for the bandwidth that point uses；NrnFor the number of the RN in cell；E(Qrue) be relay system in RUE handling capacities desired value.
In addition, for the purpose of user fairness, each RUE handling capacity statistically should be identical with MUE handling capacity.Such as
User density or data service between fruit relaying and eNB is uneven, can increase some weights.Therefore, can obtain：
(formula 2)
Wherein ω is the weight of the ratio of the traffic density of the traffic density and MUE that represent RUE；NrueFor RUE in cell
Number；E(Qmue_bh) desired values of the MUE handling capacities during backhaul subframe is represented, and it is above-mentioned power proportions ξ (that is, cells
The power proportions of central transmission and cell edge transmission) function；E(Qmue) represent MUE handling capacities desired value；NmueFor cell
Middle MUE number.
In order to solve the two functions, the SINR performances and throughput performance of different links will be analyzed respectively.
It is possible, firstly, to the basic path loss model that will act as analysis is written as：
(formula 3)
Wherein d is the distance between service station and UE, fcFor carrier frequency, c0For light propagation speed, and γ is path damage
Lose index.
As described above, in the exemplary embodiment, it is assumed that UE is evenly distributed in annular section.From UE to service
The minimum range of node is 0.1R, and wherein R is the length on the hexagon side of cell, as shown in Fig. 6 A or 7A.Then, for non-
The situation of relaying, for being d with the distance of service nodebUE probability density function (PDF) can be expressed from the next：
(formula 4)
For relaying situation, for being d with the distance of service nodemMUE PDF can be similarly by following expressions：
(formula 5)
Similarly, in relaying situation, the distance with service node is drRUE PDF can also be by following expressions：
(formula 6)
Wherein dbRepresent to service eNB distance from UE to it in non-relaying situation；dmRepresent in relaying situation from MUE to eNB
Distance；drRepresent to service RN distance from RUE to it；RbRepresent the radius of society of eNB in non-relaying situation, R0Represent relaying
ENB radius of society in situation, and r0Represent the radius of society of RN in relaying situation.On parameter Rb、R、R0、r0, in the presence of
State relation：
Rb=1.5R, R0+r0=Rb(formula 7)
Additionally, due to UE by based on the signal intensity of reception come determine cell select, so will have following formulas：
(formula 8)
SINR is analyzed
For downlink transmission, possibility via node of all interference in eNB and neighbor cell (depends on portion
Affix one's name to scene and sub-frame configuration).For simplicity, the interfering nodes of immediate first layer are only considered, and in view of every
The influence of the directional aerial of individual sector (cell), ideally, the interference from neighbor cell will be suppressed.In non-
Exemplified by the UE in situation, the SINR of UE reception can be estimated as：
(formula 9)
Wherein diFor from UE to interference eNBiDistance, (covered for directional antenna pattern small around related UE first layer
Area, i=1,2 ..., 6), PbFor eNB transimission power, and PDNFor Carrier To Noise Power Density.
Therefore, according to formula 9, TUEIt can be expressed as：
(formula 10)
In view of the fact that RN and eNB uses different frequency bands in access link transmission in embodiments of the present invention, MUE
Only it will be disturbed by eNB.Therefore, similar to the UE in non-relaying situation, MUE SINR can be represented during subframe is accessed
For：
(formula 11)
Wherein TmueIt can be expressed as：
(formula 12)
On the other hand, in access link transmission, RUE (is relaying the interference for experiencing the via node from half
Between frequency duplex factor as one be 2 situation in).For simplicity, it is assumed that have two in each macrocell shown in Fig. 8
Individual via node, and RUE SINR can be approximated to be：
(formula 13)
Wherein TrueIt can be expressed as：
(formula 14)
Wherein PrRepresent the transimission power of via node.Fig. 8 schematically shows the diagram of RUE example interference, wherein examining
The interference of all via nodes in peripheral cell is considered.It should be noted, however, that for the situation more than two RN, can
To obtain similar formula, those skilled in the art can obtain the formula according to teachings herein provided, and thus will not
It is repeated.
In backhaul link transmission, RUE will not receive any data, and MUE will be received and thus they will by with
The horizontal adjacent eNB interference of different capacity.MUE SINR can be derived as in backhaul link transmission：
(formula 15)
Wherein Tmue_dbIt can be expressed as：
(formula 16)
And similarly, the SINR of via node can be exported as in backhaul link transmission：
(formula 17)
It can be obtained from formula 9Based on this relation and by using the theory of function of random variable,
Γ can be obtaineduePDF.
(formula 18)
In addition, for Γmue、Γrue、Γmue_bhPDF, them can be exported according to same way respectively.
Throughput analysis
If QueFor representing the normalization user throughput in the UE in non-relay system in units of bps/Hz, then it
There to be Que=log (1+ Γue), it thus will obtain Γue=2Que-1.Therefore, QuePDF can export as：
(formula 19)
It should be understood, however, that because hardware constraints and the availability of modulation and encoding scheme, SINR should be set in reality
Limit.Thus, if setting ΓmaxFor UE the SINR upper limits quantitatively (for example, Γmax=6.99, it is 21dB), in formula 19
QueScope will be changed into：
(formula 20)
Additionally, Q can be obtained in a similar waymue、Qrue、Qmue_bhPDF.
The desired value of UE handling capacities can be exported as further：
(formula 21)
Similarly, the E (Q of similar type can be obtainedmue)、E(Qrue) and E (Qmue_bh), and can also based on formula 17
Obtain Qrn, i.e. Qrn=log (1+ Γrn)。
QrnWith E (Qrue) formula can substitute into formula 1 the efficiency of transmission optimization aim provided, and then can be with
Parameter alpha can be solved.Afterwards, formula E (Qmue)、E(Qrue) and E (Qmue_bh) and parameter alpha can be substituted into formula 2 to
Another user fairness target gone out.As described above, E (Qmue_bh) be ξ function, it can be solved by using dichotomy.Cause
And by performing optimization analysis, it may be determined that parameter alpha and ξ.
In embodiments of the present invention, it is proposed that a kind of channeling strategy based on during backhaul and access subframe
It is co-design, with interior relay system it is simple but effective interference harmony scheme.The new interference harmony scheme reduces
The interference that particularly edge customer is undergone.Using embodiments of the present invention, user's particularly Cell Edge User undergoes
To interference can be reduced, and thus their performance will greatly improve.Additionally, embodiments of the present invention have
Low-down complexity and Signalling Designing can be compatible with current LTE standard.
In addition, in the present invention, additionally providing a kind of equipment for channeling, it will be described by with reference to figure 9.
As Fig. 9 illustrates, equipment 900 may include frequency band division module 910 and band selection module 920.Frequency band division module
910 can be configured to, and are transmitted for access link, system bandwidth is divided into at least three frequency bands.Band selection module 920 can
To be configured to from the base station that described at least three frequency band selections, one frequency band is used in all cells, other frequency bands are by cell
Via node is multiplexed, and frequency duplex factor as one is at least 2.
In one embodiment of the present invention, the other frequency bands being multiplexed by the via node can be that size is identical
's.
In another embodiment of the present invention, for backhaul link transmission, can use different from access link transmission
Soft-frequency reuse scheme.
In the further embodiments of the present invention, frequency band division module 910 can be configured to, and be passed for back haul link
It is defeated, system bandwidth is divided at least the other three frequency band；And wherein band selection module 920 can be configured to from described
The via node that at least one frequency band of the other three frequency band selection is used in serving cell so that taken between two neighbor cells
The frequency band of business via node is central user orthogonal, that other frequency bands are used in serving cell.
In the another further embodiments of the present invention, in backhaul link transmission, for described in service relay node
Transimission power in one frequency can be higher than the transimission power on other frequency bands for service centre user.
In another further embodiments of the present invention, this method can also include optimization analysis module 930.The optimization point
Analysis module 930 can be configured to by performance objective to ensure system effectiveness and realizing the optimization analysis operation of user fairness, really
Determine to be used in access link transmission the frequency band of via node relative to being used in the ratio and backhaul link transmission of system bandwidth
Transimission power on other frequency bands of service centre user and the transmission work(on one frequency band of service relay node
Ratio between rate.
In the still further embodiment of the present invention, the via node can be deployed near cell edge.
Additionally, a kind of network node is additionally provided, it is included in the invention the equipment of offer.
It is noted that the operation for the corresponding module that equipment 900 and network node include corresponds essentially to as described before
Correlation method step.Accordingly, with respect to the details of the work of these modules, refer to reference to 4 to 8 pairs of methods of the invention of figure
It is described above.
Additionally, inventor is emulated to conventional scheme and technical scheme provided by the invention.For three
Individual scheme 1 to 3 performs emulation, and wherein scheme 1 is the solution in non-relay system, and scheme 2 is the relaying of channeling 1 system
Solution in system, and scheme 3 is the solution according to the illustrative embodiments of the present invention.In these emulation,
The down-link performance with interior Class1 relaying in cellular layout is have evaluated.The simulation parameter used in emulation in table 1 to
Go out.
The simulation parameter of table 1
As listed, in these emulation, 15 UE are geographically randomly distributed in each sector.UE is associated with tool
There are the grand eNB or relaying of highest received signal intensity.As shown in fig. 7, relaying is set to close to eNB antenna boresights.It is used
Business model is full buffer and RN only gives the packets forwarding correctly decoded to its RUE.
The theoretical value and simulation result of the total cell average throughput of three different schemes are listed in table 2.It is expected
Value is as obtained from above-mentioned optimization analysis operation.
The cell average throughput of table 2
As can be seen from the above table, simulation result matches very good with notional result.This show with regard to cell average throughput and
Speech, scheme 2 (that is, the trunking plan of channeling 1) relative to scheme 1 (that is, non-trunking plan) there is very slight performance to change
It is kind.However, scheme 3 (that is, the relaying ICIC schemes proposed in the present invention) has significantly relative to the trunking plan of channeling 1
Performance gain (more than 25%).Find out from the table, the total RUE handling capacities of scheme 3 are far below the relay system of channeling 1
Amount to RUE handling capacities.Reason is, due to relaying compared with low transmission power, RUE number is much smaller than MUE in cell
Number.This distribution of MUE and RUE total handling capacity shows the fairness between different type UE and also achieves maximum
Overall system throughput.
Average and cell edge user throughput the simulation result on three schemes is also show in table 3.
Table 3 is on average and cell edge throughput simulation result
| User throughput | It is average | Cell edge (5%) |
| Scheme 1 | 0.800 (0%) | 0.0714 (0%) |
| Scheme 2 | 0.919 (+3.4%) | 0.0541 (- 24.2%) |
| Scheme 3 | 1.158 (+30.2%) | 0.0900 (+26.1%) |
On the basis of scheme 1 (that is, non-trunking plan), scheme 2 (that is, repeated frequency is multiplexed 1 scheme) has small user
Average throughput flow gain, but lost with big cell edge user throughput.On the contrary, scheme 3 (that is, carries in the present invention
The relaying ICIC schemes gone out) all there is significant performance gain on average user throughput and cell edge user throughput.
In addition, illustrate the CDF of the user throughput of three different schemes in Figure 10.Understand from Figure 10, (that is, the frequency of scheme 2
It is multiplexed 1 trunking plan) there is low throughput value for the user of low percentage, it is introduced into because being relayed when without using ICIC
More interference.Scheme 3 (that is, the relaying ICIC schemes proposed in the present invention) is relative to other two schemes for low percentage
User and the users of Gao percentages all there is more preferably throughput performance.These results show the ICIC proposed in the present invention
Scheme is the effective means for both central user and edge customer interference reduction.
Hereinbefore, for purpose of explanation, by describing the present invention by taking frequency duplex factor as one 2 as an example.However, it is to be mentioned that this
Invention not limited to this, and by contrast, at least 2 any appropriate factor can be used as required in it.
Additionally, two optimization aims by reference to efficiency of transmission and user fairness describe the embodiment party of the present invention
Formula, but the present invention can use any other appropriate optimization aim, the maximization of such as systematic function, Cell Edge User
The maximization of performance or similar target.
Additionally, such as described in backhaul link transmission, RN is considered as Cell Edge User and using conventional soft by it
Frequency reuse plan, but be also possible to use other existing soft-frequency reuse schemes.
Up to the present, the present invention has been described with reference to the drawings by specific preferred embodiment.It should be noted, however, that
The invention is not restricted to embodiment that is shown and providing, but various modifications can be carried out within the scope of the present invention.
In addition, embodiments of the present invention can be implemented in software, hardware or its combination.Hardware components can be by special
Logic is implemented；Software section can be stored in memory and be held by the appropriate instruction of such as microprocessor or special designs hardware
Row system performs.It will appreciated by the skilled person that the above method and system can utilize the meter included in processor
Calculation machine executable instruction and/or control routine are implemented, for example, this code is provided in such as disk, CD or DVD-ROM
Bearing medium, the either such as number of the programmable storage of read-only storage (firmware) or such as optics or electrical signal carrier
According to carrier.Device and its part in embodiment of the present invention can be implemented by hardware circuit, such as super large-scale integration
The semiconductor of OR gate array, such as logic chip or transistor, or such as field programmable gate array or FPGA are set
Standby programmable hardware device；Or can be by the software implementation of all kinds computing device；Or can be by above-mentioned hardware
The combination of circuit and software, such as implemented by firmware.
Although describing the present invention by reference to the embodiment currently considered, however, it is understood that the invention is not restricted to institute
Disclosed embodiment.On the contrary, it is contemplated that cover to fall various adjustment in the spirit and scope of the appended claims and
Equivalent arrangements.The scope of the appended claims meet broadest explanation and cover it is all it is this adjustment and equivalent structure and
Function.
Claims (11)
1. a kind of method for being used for channeling in relay communications system, including,
Transmitted for access link, system bandwidth is divided at least three frequency bands；And
From the base station that described at least three frequency band selections, one frequency band is used in all cells, other frequency bands are by the cell
Via node is multiplexed with being at least 2 frequency duplex factor as one；The other frequency bands being wherein multiplexed by the via node are big
It is small equal；Wherein for backhaul link transmission, the soft-frequency reuse scheme different from access link transmission is used.
2. the method according to claim 11, in addition to,
For the backhaul link transmission, the system bandwidth is divided at least the other three frequency band；And
The via node being used for from described one frequency band of at least the other three frequency band selection in serving cell, to cause in two phases
Frequency band between adjacent cell for service relay node is orthogonal, and the macrocell that other frequency bands are used to service in the cell is used
Family.
3. according to the method for claim 2, wherein in the backhaul link transmission, for servicing the via node
Transimission power on one frequency band, which is higher than, to be used to service the transimission power on other frequency bands of the macrocell user.
4. according to the method for claim 3, wherein for guarantee system effectiveness and realizing user fairness by performance objective
Optimize analysis operation, determine to be used for the frequency band of via node relative to the system bandwidth in the access link transmission
It is used to service the transmission work(on other frequency bands of the macrocell user in ratio and the backhaul link transmission
Ratio between rate and the transimission power on one frequency band of service relay node.
5. according to the method for claim 1, wherein the via node is deployed near cell edge.
6. a kind of equipment for being used for channeling in relay communications system, including,
Frequency band division module, it is configured to transmit for access link, system bandwidth is divided at least three frequency bands；And
Band selection module, it is configured to the base for selecting a frequency band to be used in all cells from least three frequency band
Stand, other frequency bands are multiplexed by the via node in the cell with being at least 2 frequency duplex factor as one；Wherein by the relaying
Other frequency bands of node multiplexing are equal in magnitude；Wherein for backhaul link transmission, transmitted not using with the access link
Same soft-frequency reuse scheme.
7. equipment according to claim 6, wherein the frequency band division module is further configured to, for the back haul link
Transmission, at least the other three frequency band is divided into by the system bandwidth；And
Wherein described band selection module is further configured to be used to service from described one frequency band of at least the other three frequency band selection
Via node in cell, with cause between two neighbor cells for service relay node frequency band be it is orthogonal, it is other
Frequency band is used to service the macrocell user in the cell.
8. equipment according to claim 7, wherein in the backhaul link transmission, for servicing the via node
Transimission power on one frequency band, which is higher than, to be used to service the transimission power on other frequency bands of the macrocell user.
9. equipment according to claim 8, in addition to
Optimize analysis module, be configured to analyze behaviour with the optimization for realizing user fairness by performance objective for guarantee system effectiveness
Make, determine to be used in the access link transmission frequency band of via node relative to the ratio of the system bandwidth and
It is used to service the transimission power on other frequency bands of the macrocell user in the backhaul link transmission with being used for
The ratio between the transimission power on one frequency band of service relay node.
10. equipment according to claim 6, wherein the via node is deployed near cell edge.
11. a kind of network node, including equipment according to claim 6.
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| PCT/CN2012/082499 WO2014047946A1 (en) | 2012-09-29 | 2012-09-29 | Method and apparatus for frequency reuse in relaying communication system and network node therefor |
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| CN101772029A (en) * | 2009-01-05 | 2010-07-07 | 上海贝尔阿尔卡特股份有限公司 | Frequency resource allocation method, device and wireless communication system |
| WO2011097756A1 (en) * | 2010-02-11 | 2011-08-18 | 上海贝尔股份有限公司 | Method and device for allocating frequency bands by using frequency reuse |
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| WO2011097756A1 (en) * | 2010-02-11 | 2011-08-18 | 上海贝尔股份有限公司 | Method and device for allocating frequency bands by using frequency reuse |
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| 3rd Generation Partnership Project Technical Specification Group Radio Access Network Evolved Universal Terrestrial Radio Access (E-UTRA) Further advancements for E-UTRA physical layer aspects;3rd Generation Partnership Project;《3GPP TR 36.814 V9.0.0 》;20100330;全文 * |
| OFDMA蜂窝中继系统资源分配的研究;陆泽春;《中国优秀硕士学位论文全文数据库信息科技辑》;20120815;16页 * |
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