CN101765119A - Dynamic fractional frequency reuse method based on OFDMA wireless cellular network - Google Patents

Dynamic fractional frequency reuse method based on OFDMA wireless cellular network Download PDF

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CN101765119A
CN101765119A CN200910273181A CN200910273181A CN101765119A CN 101765119 A CN101765119 A CN 101765119A CN 200910273181 A CN200910273181 A CN 200910273181A CN 200910273181 A CN200910273181 A CN 200910273181A CN 101765119 A CN101765119 A CN 101765119A
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district
cell
portable terminal
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刘路
屈代明
江涛
王德胜
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Huazhong University of Science and Technology
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Abstract

The invention discloses a dynamic fractional frequency reuse method based on an OFDMA wireless cellular network. The method is characterized in that in the OFDMA wireless cellular network, each cell sends the interference avoiding request on a respective priority sub band to an adjacent interference cell, each cell lowers the corresponding sending frequency on the interference avoiding sub bands when receiving the interference avoiding request on the respective priority sub band, at the time, the fractional frequency reuse patterns of marginal mobile terminals can be favorably and dynamically obtained, and the inter-cell interference (ICI) of the marginal mobile terminals of each cell distributed to the priority sub bands can be effectively reduced. The method of the invention can effectively lower the ICI in the OFDMA wireless cellular network under the condition of not lowering the frequency spectrum utilizing rate and the total network volume, so the throughput performance of the marginal mobile terminals can be improved.

Description

A kind of dynamic fractional frequency reuse method based on the OFDMA wireless cellular network
Technical field
The invention belongs to wireless communication technology field, relate in particular to a kind of dynamic fractional frequency reuse method based on OFDM (OFDMA) wireless cellular network.
Background technology
For the data, services of high speed is provided for portable terminal in wireless cellular network of future generation (for example LTE), OFDMA is proposed as a kind of effective multiple access access scheme.In OFDMA, can be by providing different available subcarriers to realize that multi-mobile-terminal inserts in different timeslices for each portable terminal.Fig. 1 has provided the OFDMA schematic diagram, and wherein different colors has been represented different portable terminals, has taken different frequency spectrum resources in the different time.After each time slot finished, local resource will be by from new distribution.In OFDMA cellular network down link, owing to have orthogonality between the subcarrier in the single sub-district, so the interference between same cell mobile terminal exists hardly.But, when the frequency duplex factor as one of each sub-district of OFDMA cellular network is 1, can produce serious presence of intercell interference (ICI), this will make the total throughout of system descend.The ICI especially severe that the cell edge portable terminal is subjected to, the non-constant of their throughput performance.Therefore, under the situation that does not reduce the availability of frequency spectrum and overall system capacity, how to reduce the ICI in the OFDMA cellular network, the throughput that improves the cell edge portable terminal remains a challenging problem.At present, the correlation technique of reduction ICI has:
(1) frequency duplex factor as one is 3 (Reuse 3) method, see S.E.Elayoubi, O.BenHaddada, and B.Fourestie, " Performance evaluation of frequency planningschemes in OFDMA-based networks; " IEEE Transactions on WirelessCommunications, vol.7, no.5, pp.1623-1633,2008, this method is equally divided into 3 parts to whole available frequency band, use for adjacent three sub-districts respectively, thereby reduce co-channel interference between neighbor cell greatly.But, because 1/3 bandwidth can only be used in each sub-district, so the availability of frequency spectrum is very low.
(2) soft-frequency reuse (SFR) method is seen 3GPP, R1-050507, Huawei, " Softfrequency reuse scheme for UTRAN LTE, " 2005, in the SFR method, the frequency duplex factor as one in center of housing estate zone is 1, and the frequency duplex factor as one of cell edge region is 3.
Above-mentioned the whole bag of tricks all is static frequency reuse plan, can not satisfy dynamic channel circumstance and change demand.
Summary of the invention
The purpose of this invention is to provide a kind of dynamic fractional frequency reuse method based on the OFDMA wireless cellular network, the inventive method can be under the situation that does not reduce the availability of frequency spectrum and network total capacity, reduce the presence of intercell interference in the OFDMA wireless cellular network, improve the throughput of cell edge portable terminal.
Dynamic fractional frequency reuse method based on the OFDMA wireless cellular network provided by the invention is characterized in that it comprises the steps:
The frequency resource that the 1st step can use each sub-district of OFDMA wireless cellular network evenly is divided into the experimental process frequency range, each frequency sub-band is called subband, and these subbands are classified as public subband, preferential subband and interference avoidance subband, and the transmitted power of public subband and preferential subband constant be maximum transmit power P on each subband Max, the transmitted power P of interference avoidance subband IASBBe variable, its span is 0≤P IASB≤ P Max
The planning of subband is carried out in the 2nd each sub-district of step: wherein a part of subband is chosen as the public subband of this sub-district in each sub-district, choose the preferential subband of a part of subband again as this sub-district, remaining subband is as the interference avoidance subband of this sub-district, choose and satisfy following condition in the process: the public subband of the subband of same frequency as this sub-district all chosen in all sub-districts, the preferential subband of the subband of different frequency as this sub-district chosen in adjacent sub-district, and the public subband of each sub-district and preferential subband are dressing and arrange on frequency axis;
The 3rd step is on public subband, portable terminal is measured from the useful signal intensity of this sub-district with from the interference signal intensity of neighbor cell on every side, portable terminal is given the affiliated subdistrict base station with these feedback information, and it is center portable terminal or edge mobile terminal that cell base station is divided described portable terminal according to the portable terminal feedack;
The 4th step cell base station is distributed to portable terminal to subband according to the division information of portable terminal, and edge mobile terminal allows to be assigned to all types of subbands, but the center portable terminal only allows to be assigned to public subband and interference avoidance subband;
The 5th step is for the edge mobile terminal that is assigned to preferential subband, and to be described edge mobile terminal send the interference avoidance request to the base station of adjacent interference sub-district to cell base station, asks these interference base stations to be reduced in transmitted power on the same frequency subband;
After the 6th step, each cell base station was received the interference avoidance request, on corresponding interference avoidance subband, reduce corresponding transmitted power.
Method of the present invention is a kind of dynamic fractional frequency reuse method based on the OFDMA wireless cellular network.In the OFDMA wireless cellular network, each sub-district sends the interference avoidance request to adjacent interfered cell on preferential subband separately.When each sub-district after receiving described interference avoidance request on the interference avoidance subband separately, will on these interference avoidance subbands, reduce corresponding transmitted power.At this moment, the fractional frequency reuse pattern that helps edge mobile terminal will dynamically obtain, and each cell allocation will effectively reduce to the ICI that the edge mobile terminal of preferential subband is subjected to.Therefore, method of the present invention can effectively reduce the ICI in the OFDMA wireless cellular network under the situation that does not reduce the availability of frequency spectrum and network total capacity, thereby improves the throughput performance of edge mobile terminal.
Description of drawings
Fig. 1 is an OFDMA schematic diagram in the background technology;
Fig. 2 is the flow chart of the inventive method;
Fig. 3 .1 is the schematic diagram of OFDMA wireless cellular network; Fig. 3 .2 is the present invention's dissimilar subband planning schematic diagrames in neighbor cell;
Fig. 4 is the dissimilar allocation of subbands schematic diagrames of the present invention.
Embodiment
Below by by embodiment the present invention being described in further detail, but following examples only are illustrative, and protection scope of the present invention is not subjected to the restriction of these embodiment.
As shown in Figure 2, the present invention specifically may further comprise the steps:
1, the OFDMA wireless cellular network is made of several sub-districts, and there are a base station and several portable terminals in each sub-district.In OFDMA wireless cellular network down channel, each sub-district evenly is divided into the experimental process frequency range with the frequency resource that network allows to use, and each frequency sub-band is called subband.Network classifies as three types with these subbands, and their name is respectively: public subband, preferential subband and interference avoidance subband.The transmitted power of all kinds subband has following restriction:
The transmitted power of public subband and preferential subband is constant to be P Max(P MaxBe the maximum transmit power on each subband), the transmitted power P of interference avoidance subband IASBBe variable, its span is 0≤P IASB≤ P Max
Utilize following formula to the maximum transmit power P on each subband MaxCalculate:
P max = P cell N SB
Wherein, P CellBe the maximum transmit power of cell base station, N SBIt is the subband number of each sub-district.
2. public subband is carried out in each sub-district, the planning of preferential subband and interference avoidance subband.
When the dissimilar subband in each sub-district was planned, wherein a part of subband was chosen as the public subband of this sub-district in each sub-district, chooses the preferential subband of a part of subband as this sub-district again, and remaining subband is as the interference avoidance subband of this sub-district.Above-mentioned subband is chosen arbitrarily meeting under the prerequisite of following selection principle:
Principle one: the public subband of the subband of same frequency as this sub-district all chosen in all sub-districts.
Principle two: for the interference of more effective minimizing minizone, the preferential subband of the subband of different frequency as this sub-district chosen in adjacent sub-district.
Principle three: in order to obtain bigger frequency diversity gain, the public subband of each sub-district and preferential subband are dressing and arrange on frequency axis.
Suppose shown in Fig. 3 .1, the total individual sub-district of J (J=7) in the OFDMA wireless cellular network, there is a base station each sub-district.Shown in Fig. 3 .2, each sub-district allows to distribute all subbands, and the sub-band sum of supposing each sub-district is 16.Describe for convenient, give the unique logical number of each allocation of subbands.The subband that logical number is identical means that they are subbands of same frequency.Subband is all chosen in all sub-districts (sub-district 1 to 7), and { 1,5,9,13} is as the public subband of this sub-district.Subband is chosen in sub-district 1, and { 2,6,10,14} is as the preferential subband of this sub-district, and { 2,4,6} chooses subband, and { 3,7,11,15} is as the preferential subband of this sub-district, and { 3,5,7} chooses subband, and { 4,8,12,16} is as the preferential subband of this sub-district in the sub-district in the sub-district.Therefore, the preferential subband of neighbor cell is mutually orthogonal.Each sub-district is with the interference avoidance subband of remaining subband as this sub-district.
3. on public subband, portable terminal is measured from the useful signal intensity of this sub-district with from the interference signal intensity of neighbor cell on every side, and portable terminal is given the affiliated subdistrict base station with these feedback information.It is center portable terminal or edge mobile terminal that cell base station is divided described portable terminal according to the portable terminal feedack.
Detailed process is:
Make i, j represent the sequence number of two different sub-districts, u iThe sequence number of portable terminal in the expression cell i, c iThe sequence number of public subband in the expression cell i.Public subband c in cell i iOn, portable terminal u iMeasurement is from the useful signal intensity of this sub-district
Figure G2009102731814D00051
And from the interference signal intensity of neighbor cell j on every side
Figure G2009102731814D00052
Portable terminal u iWill With Feed back to the base station of affiliated subdistrict i.
The base station of cell i is according to portable terminal u iFeedback
Figure G2009102731814D00055
With
Figure G2009102731814D00056
Utilize following formula to calculate described portable terminal u iAt public subband c iOn signal interference ratio
Figure G2009102731814D00057
γ u i , c i = D u i , i , c i Σ j = 1 , j ≠ i J I u i , j , c i
Wherein, J represents total number of sub-district in the cellular network.
The base station of cell i obtains
Figure G2009102731814D00059
After, utilize following formula to estimate described portable terminal u iAverage signal interference ratio on all subbands
Figure G2009102731814D000510
γ u i = 1 N CSB , i Σ c i ∈ A CSB , i γ u i , c i
Wherein, A CSB, iThe set of public sub-band serial number in the expression cell i, N CSB, iTotal number of public subband in the expression cell i.
The base station of cell i obtains After, Compare with the predefined division thresholding of edge mobile terminal δ (divide thresholding δ and determine that the scale of its decision center portable terminal and edge mobile terminal is generally got 0＜δ≤10 when the network planning), if γ u i > δ , Then this portable terminal u iBe divided into the center portable terminal, otherwise this portable terminal u iBe divided into edge mobile terminal.
4. cell base station is distributed to portable terminal to subband according to the division information of portable terminal.
The principle of distributing is:
As shown in Figure 4, edge mobile terminal allows to be assigned to all types of subbands, but the center portable terminal only allows to be assigned to two types subband: public subband and interference avoidance subband.
5. for the edge mobile terminal that is assigned to preferential subband, cell base station is that described edge mobile terminal sends several interference avoidance requests (IAR) to the base station of adjacent interference sub-district, asks these interference base stations to be reduced in transmitted power on the same frequency subband.
Detailed process is as follows:
The base station of cell i is according to the average signal interference ratio of edge mobile terminal
Figure G2009102731814D00064
All edge mobile terminals are divided into the individual grade of Q (Q is a positive integer, generally gets 2≤Q≤10, and this parameter is determined) when the network planning.Q (q=1,2 ... Q) the average signal interference ratio interval of level edge termination is [γ Q-1, γ q], γ qBe defined as:
γ ‾ q = 0 , q = 0 g - 1 ( q Q ) , q = 1,2 , . . . Q - 1 δ , q = Q
Wherein, g (γ) is the average signal interference ratio of edge mobile terminal
Figure G2009102731814D00066
Cumulative distribution function, be defined as:
g ( γ ) = P { γ u i ≤ γ }
On each preferential subband, the 1st grade of edge termination that average signal interference ratio is minimum allows to use I Max(I MaxBe the upper limit that each edge termination allows to use the IAR number, value is a positive integer, generally gets 5≤I Max≤ 50, this parameter is determined when the network planning) individual IAR.In the adjacent two-stage, the edge termination of low one-level allows to use m than higher leveled edge termination more, and (m is that adjacent two-stage edge termination allows to use the differential of IAR number, value is a positive integer, generally get 1≤m≤10, this parameter is determined when the network planning) individual IAR, q (q=1,2, ... Q) grade IAR number that the edge termination permission is used is max{0, I Max-m * (q-1) }.Wherein, each IAR represents to ask corresponding interference base station to reduce ε dB (ε is the performance number that each interference avoidance request reduces, and generally gets 0＜ε≤10, and this parameter is determined) transmitted power on corresponding interference avoidance subcarrier when the network planning.
For example, in sub-district 1, suppose Q=2, δ=5, [γ 0, γ 1, γ 2]=[0,1,5], I Max=20, m=5, ε=3.If an average signal interference ratio that belongs to the edge mobile terminal of sub-district 1 is 2, and has been assigned to preferential subband 2.So, this edge mobile terminal belongs to the 2nd grade of edge mobile terminal, and it allows to use max{0 on preferential subband 2,20-5 * (2-1) }=15 IAR.The base station is described edge mobile terminal, and { 2,3,4,5,6,7} sends 15 IAR altogether, asks them to reduce the transmitted power on the subband 2 in the sub-district separately to the adjacent interference sub-district.Wherein, each IAR represents to ask corresponding cell base station to reduce the transmitted power of its 3dB on subband 2.
6. after each cell base station is received the interference avoidance request, on corresponding interference avoidance subband, reduce corresponding transmitted power.
Detailed process is as follows:
Make a iThe interference avoidance sub-band serial number of expression cell i, cell i is at interference avoidance subband a iOn the number that receives from the IAR of sub-district j be
Figure G2009102731814D00071
Cell i will be at this interference avoidance subband a so iLast reduction
Figure G2009102731814D00072
Transmitted power.
Wherein, K a i = max j ∈ BS i , a i K j , a i ,
Figure G2009102731814D00074
Expression is to the interference avoidance subband a of cell i iSend the set of the sub-district sequence number of IAR.
Therefore, cell i is at interference avoidance subband a iOn transmitted power
Figure G2009102731814D00075
For:
P i , a i = P max - ( K a i × ϵdB )
For example, suppose sub-district 1 on subband 2, receive from the sub-district 2,4, the IAR number of 6} is respectively: 3,5,4.So, the transmitted power P of sub-district 1 on interference avoidance subband 2 1,2For:
P 1，2＝P max-(5×εdB)
When cell base station passed through downlink transmission data, cell base station sent data to this portable terminal according to the subband of distributing to this portable terminal and corresponding transmitted power, and this portable terminal receives data simultaneously.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (4)

1. the dynamic fractional frequency reuse method based on the OFDMA wireless cellular network is characterized in that it comprises the steps:
The frequency resource that the 1st step can use each sub-district of OFDMA wireless cellular network evenly is divided into the experimental process frequency range, each frequency sub-band is called subband, and these subbands are classified as public subband, preferential subband and interference avoidance subband, and the transmitted power of public subband and preferential subband constant be maximum transmit power P on each subband Max, the transmitted power P of interference avoidance subband IASBBe variable, its span is 0≤P IASB≤ P Max
The planning of subband is carried out in the 2nd each sub-district of step: wherein a part of subband is chosen as the public subband of this sub-district in each sub-district, choose the preferential subband of a part of subband again as this sub-district, remaining subband is as the interference avoidance subband of this sub-district, choose and satisfy following condition in the process: the public subband of the subband of same frequency as this sub-district all chosen in all sub-districts, the preferential subband of the subband of different frequency as this sub-district chosen in adjacent sub-district, and the public subband of each sub-district and preferential subband are dressing and arrange on frequency axis;
The 3rd step is on public subband, portable terminal is measured from the useful signal intensity of this sub-district with from the interference signal intensity of neighbor cell on every side, portable terminal is given the affiliated subdistrict base station with these feedback information, and it is center portable terminal or edge mobile terminal that cell base station is divided described portable terminal according to the portable terminal feedack;
The 4th step cell base station is distributed to portable terminal to subband according to the division information of portable terminal, and edge mobile terminal allows to be assigned to all types of subbands, but the center portable terminal only allows to be assigned to public subband and interference avoidance subband;
The 5th step is for the edge mobile terminal that is assigned to preferential subband, and to be described edge mobile terminal send the interference avoidance request to the base station of adjacent interference sub-district to cell base station, asks these interference base stations to be reduced in transmitted power on the same frequency subband;
After the 6th step, each cell base station was received the interference avoidance request, on corresponding interference avoidance subband, reduce corresponding transmitted power.
2. dynamic fractional frequency reuse method according to claim 1 is characterized in that, the 3rd step comprised following process:
The 3.1st goes on foot the sequence number that makes i, j represent two different sub-districts, u iThe sequence number of portable terminal in the expression cell i, c iThe sequence number of public subband in the expression cell i; Public subband c in cell i iOn, portable terminal u iMeasurement is from the useful signal intensity of this sub-district , and from the interference signal intensity of neighbor cell j on every side
Figure F2009102731814C00022
, portable terminal u iWill
Figure F2009102731814C00023
With
Figure F2009102731814C00024
Feed back to the base station of affiliated subdistrict i;
The base station of the 3.2nd step cell i is according to portable terminal u iFeedback
Figure F2009102731814C00025
With
Figure F2009102731814C00026
, utilize following formula to calculate described portable terminal u iAt public subband c iOn signal interference ratio
Figure F2009102731814C00027
:
γ u i , c i = D u i , i , c i Σ j = 1 , j ≠ i J I u i , j , c i
Wherein, J represents total number of sub-district in the cellular network;
The base station of the 3.3rd step cell i obtains
Figure F2009102731814C00029
After, utilize following formula to estimate described portable terminal u iAverage signal interference ratio on all subbands
Figure F2009102731814C000210
:
γ u i = 1 N CSB , i Σ c i ∈ A CSB , i γ u i , c i
Wherein, A CSB, iThe set of public sub-band serial number in the expression cell i, N CSB, iTotal number of public subband in the expression cell i;
The base station of the 3.4th step cell i is with average signal interference ratio
Figure F2009102731814C000212
Divide thresholding δ with predefined edge mobile terminal and compare, if γ u i > δ , Then this portable terminal u iBe divided into the center portable terminal, otherwise this portable terminal u iBe divided into edge mobile terminal.
3. dynamic fractional frequency reuse method according to claim 2 is characterized in that, the 5th step comprised following process:
The base station of the 5.1st step cell i is according to the average signal interference ratio of edge mobile terminal
Figure F2009102731814C000214
, according to predefined Q value, all edge mobile terminals being divided into Q grade, the average signal interference ratio interval of q level edge termination is [γ Q-1, γ q], γ qBe defined as:
γ ‾ q = 0 , q = 0 g - 1 ( q Q ) , q = 1,2 , . . . Q - 1 δ , q = Q
Wherein, g (γ) is the average signal interference ratio of edge mobile terminal
Figure F2009102731814C00032
Cumulative distribution function, be defined as:
g ( γ ) = P { γ u i ≤ γ }
The 5.2nd step allowed to use the higher limit I of interference avoidance request number according to predefined each edge termination on each preferential subband Max, the interference avoidance request number that the 1st grade of edge termination that average signal interference ratio is minimum allows to use is set to I MaxIn the adjacent two-stage edge termination, according to the differential m value of predefined interference avoidance request number, the edge termination of low one-level allows the interference avoidance request number of using to be set to m than higher leveled edge termination more; The interference avoidance request number that q level edge termination allows to use is max{0, I Max-m * (q-1) }; According to the performance number ε that predefined each interference avoidance request reduces, each interference avoidance request represents to ask corresponding interference base station to reduce ε dB transmitted power on corresponding interference avoidance subcarrier.
4. dynamic fractional frequency reuse method according to claim 3 is characterized in that, the 6th step comprised following process:
The 6.1st step made a iThe interference avoidance sub-band serial number of expression cell i, cell i is at interference avoidance subband a iOn the number that receives from the interference avoidance request of sub-district j be , calculation plot i is at this interference avoidance subband a iThe transmitted power of last reduction, the value of the transmitted power of this reduction is
Figure F2009102731814C00035
Wherein, K a i = max j ∈ BS i , a i K j , a i ,
Figure F2009102731814C00037
Expression is to the interference avoidance subband a of cell i iSend the set of the sub-district sequence number of interference avoidance request;
The 6.2nd step was provided with cell i at interference avoidance subband a iOn transmitted power be
Figure F2009102731814C00038
, the value of this transmitted power is P i , a i = P max - ( K a i × ϵdB ) .
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