CN107181557A - A kind of inter-cell interference restraint method based on priority customer-centric - Google Patents
A kind of inter-cell interference restraint method based on priority customer-centric Download PDFInfo
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- CN107181557A CN107181557A CN201710346548.5A CN201710346548A CN107181557A CN 107181557 A CN107181557 A CN 107181557A CN 201710346548 A CN201710346548 A CN 201710346548A CN 107181557 A CN107181557 A CN 107181557A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0426—Power distribution
- H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0056—Inter-base station aspects
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Abstract
The invention discloses the inter-cell interference restraint method based on priority customer-centric in a kind of super-intensive network UDN, mainly include：Priority, user's judging process and cooperation transmission interference nulling process are coordinated in generation.For the problem of inter-cell interference of UDN downlinks, the thought of customer-centric of the present invention in interference coordination priority basis, determines the base station number for its collaboration services together with home base stationsL 1With the base station number that interference nulling is carried out by home base stationsL 2, by base station collaboration and wave beam forming, suppress inter-cell interference, lifting user performance and throughput of system.Angle-determining of the present invention from userL 1WithL 2, and consider the compromise of user performance and complexity, and user performance and systematic entirety can compromise.In addition, the CoMP that PUCIC is used is joint transmission (JT) and cooperative scheduling/wave beam forming CS/CB, i.e.,L 1Individual base station carries out JT to user,L 2Interference of the individual base station to user carries out CS/CB zero setting.
Description
Technical field
It is more particularly to a kind of the present invention relates to a kind of inter-cell interference restraint method based on priority customer-centric
Inter-cell interference restraint method based on priority customer-centric in super-intensive network UDN.
Background technology
Super-intensive network (Ultra Dense Network, UDN) is one of key technology of 5G mobile communication, by increasing
Plus low-power site deployment density makes network-intensive so that node from terminal user closer to, significantly improve system appearance
Amount, and spectrum efficiency and power efficiency is got a promotion.But it is due to the reduction of node spacing, the transmission loss phase of adjacent node
It is poor little, cause the interference source that multiple similar intensities are there may be around user, so that user is by than legacy cellular net
More serious interference, this is that super-intensive network lifting user performance brings challenge.Therefore, how to solve caused by multi-jamming sources
Problem is lost in performance, and how to turn into 5G UDN Interference Suppression Studies using network cooperating and interference management lifting user performance
In key issue.
Traditionally, there are many modes to handle problem of inter-cell interference, such as frequency division multiplexing, sectorization.And researcher
The method that many inter-cell interference suppress is it is also proposed in recent years.At present, the major way that inter-cell interference suppresses is divided into 3 kinds,
That is inter-cell interference randomization, inter-cell interference cancellation and Inter-Cell Interference Coordination/avoid.In addition, inter-cell power control and
Beam forming is also the mode of a conventional mitigation inter-cell interference.
In terms of interference management, traditional frequency reuse plan is classified based on user, by user be divided into central user and
Edge customer, the frequency range of the different impact of performance and size is used for different user, to weigh the level of systematic entirety energy.
Also one existing interference management method is that the base station that whole network is divided into mutually disjoint cluster, each cluster is disturbed
Coordinate, i.e., base station co-owns multiple carrier resources in cluster, selects suitable carrier wave to carry out data transmission each cell cooperative, but
Performance will be limited by cluster edge customer.Therefore, the interference management and interference coordination based on cluster classified based on user all or it is many or
Limited less by marginal user performance.However, in 5G UDN networkings, low power nodes are densely distributed and coverage compared with
Small, having become respectively for center and peripheral is less obvious, so traditional classified and the interference management based on cluster based on user
It has been no longer desirable for 5G UDN.
Different from traditional interference management mechanism, the interference management of customer-centric comes from Consumer's Experience angle
It is determined that processed interference base station, so as to preferably match the demand of each user.With reference to other documents propose with
Inter-Cell Interference Coordination (Use-Centric Inter-Cell Interference Coordination) side centered on family
Case requires that user proposes interference nulling request to the interference base station in the range of its interference coordination so that each user's is main dry
The source of disturbing is inhibited, and obtained performance is better than existing base station clustering method.But it is due to the mistake for the interference that selection carries out zero setting
Journey is random, it is possible to which remaining interference still can produce considerable influence to user performance, therefore in the intensive UDN networks in base station
When middle, this influence is especially serious.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of super-intensive network UDN medium and small interval disturbance restraining methods,
It is inter-cell interference suppression (the Priority based based on priority customer-centric in a kind of super-intensive network UDN
Use-CentricInterference Coordination, PUCIC) method.The present invention is by using customer-centric
Thought, the angle lifted from user performance, balance user performance and complexity, determine each user needs how many base station
For its collaboration services, the interference of which base station is avoided by interference nulling, so that the main interference source of each user can
It is suppressed or utilizes.The program with low complexity of trying one's best so that user performance is effectively lifted, interference network it is main
Bottleneck is that Cell Edge User will be resolved.
The present invention in interference coordination priority basis, is determined and this ground by using the thought of customer-centric
The base station number L stood together for its collaboration services1With the base station number L that interference nulling is carried out by home base stations2, by base station collaboration and
Wave beam forming, suppresses inter-cell interference, lifting user performance and throughput of system.The main purpose of this programme is from user
Angle-determining L1And L2, and consider the compromise of user performance and complexity, and user performance and systematic entirety can compromise.
In addition, the collaboration multicast communication CoMP that PUCIC of the present invention is used is joint transmission (JT) and cooperative scheduling/wave beam forming CS/CB,
That is L1Individual base station carries out JT, L to user2Interference of the individual base station to user carries out CS/CB zero setting.
The present invention uses following technical scheme to solve above-mentioned technical problem：
The present invention provides the inter-cell interference suppression side based on priority customer-centric in a kind of super-intensive network UDN
Method, including step in detail below：
Step 1, priority is coordinated in generation：User will receive according to the interfering signal power of the L interference base station received
To interference signal sorted from big to small according to power, obtain the priority order of the interference coordination of interference base station；
Step 2, user adjudicates：According to the priority order of the interference coordination obtained in step 1, traversal interference base station is determined
Minimum cooperative base station number L1With interference nulling base station number L2, wherein,；
Step 3, cooperation transmission and interference nulling：Make L1Individual cooperative base station and L2Individual interference nulling base station is entered to user respectively
The corresponding cooperation transmission of row and interference nulling.
As the further technical scheme of the present invention, user comes from L interference base station of surrounding according to what is received in step 1
Interference signal power, the interference signal received is sorted from big to small according to power, the interference of L interference base station is obtained
The priority order I of coordination1,I2,…,IL, wherein, ItRepresent the interference signal of t-th of interference base station, P1≥P2≥…≥PL, Pt
Represent the power of the interference signal of t-th of interference base station, t=1,2 ..., L.
As the further technical scheme of the present invention, minimum cooperative base station number L is determined in step 21With interference nulling base station
Number L2Afterwards, the priority order of interference coordination is
As the further technical scheme of the present invention, minimum cooperative base station number L is determined in step 21With interference nulling base station
Number L2Method it is specific as follows：
One) in the case of M≤L, wherein, M is antenna for base station number：
1) L is made1=0, L2=1, user estimates current letter and dries ratio, defeated if current letter is dried than being more than or equal to γ
Go out current L1、L2Value is as a result；If current letter is dried than being less than γ, into step 2)；Wherein, γ be customer service most
The threshold value of low SINR requirements；
2) L is judged1+L2Whether+1≤L is set up, and step 4 is entered if invalid), otherwise make L2=L2+ 1, into step
3)；
3) L is judged1+L2Whether+1≤L is set up, and step 4 is entered if invalid), otherwise user estimates current letter drying
Than if current letter is dried than being more than or equal to γ, exporting current L1、L2Value is as a result；It is less than if current letter dries ratio
γ, then return to step 2) dried until finding correspondence letter than first L more than or equal to γ2, and by the L2And corresponding L1Make
Export, dried if not finding correspondence letter than the L more than or equal to γ for result2Then enter step 4)；
4) L is made1=L1+1、L2=M-1, user estimates current letter and dries ratio, if current letter is dried ratio and is more than or equal to
γ, then into step 5)；If current letter is dried than being less than γ, into step 8)；
5) L is made2=1, user estimates current letter and dries ratio, if current letter is dried than being more than or equal to γ, output is worked as
Preceding L1、L2Value is as a result；If current letter is dried than being less than γ, into step 6)；
6) L is judged1+L2Whether+1≤L is set up, and step 8 is entered if invalid), otherwise make L2=L2+ 1, into step
7)；
7) L is judged1+L2Whether+1≤L is set up, and step 8 is entered if invalid), otherwise user estimates current letter drying
Than if current letter is dried than being more than or equal to γ, exporting current L1、L2Value is as a result；It is less than if current letter dries ratio
γ, then return to step 6) dried until finding correspondence letter than first L more than or equal to γ2, and by the L2And corresponding L1Make
Export, dried if not finding correspondence letter than the L more than or equal to γ for result2Then enter step 4)；
8) L is judged1Whether+1≤L sets up, the return to step 4 if setting up), otherwise make L2=0, export current L1And L2Value
As a result；
Two) in the case of M ＞ L：
A L) is made1=0, L2=1, user estimates current letter and dries ratio, defeated if current letter is dried than being more than or equal to γ
Go out current L1、L2Value is as a result；If current letter is dried than being less than γ, into step B)；
B L) is judged1+L2Whether+1≤L is set up, and step D is entered if invalid), otherwise make L2=L2+ 1, into step
C)；
C L) is judged1+L2Whether+1≤L is set up, and step D is entered if invalid), otherwise user estimates current letter drying
Than if current letter is dried than being more than or equal to γ, exporting current L1、L2Value is as a result；It is less than if current letter dries ratio
γ, then return to step B) dried until finding correspondence letter than first L more than or equal to γ2, and by the L2And corresponding L1Make
Export, dried if not finding correspondence letter than the L more than or equal to γ for result2Then enter step D)；
D L) is judged1Whether+1≤L is set up, and step E is entered if setting up), otherwise make L2=0, export current L1And L2Value
As a result；
E L) is made1=L1+1、L2=1, user estimates current letter and dries ratio, if current letter is dried than being more than or equal to γ,
Then export current L1、L2Value is as a result；If current letter is dried than being less than γ, return to step E)；
Three) to step one) or two) in output L1、L2Value, judges L1Whether+1≤L is set up, and step is performed if setting up
Suddenly 1., otherwise step is performed 2.；
1., first, user estimates current L to step1、L2SINR is compared in corresponding letter drying1；Secondly, L is made1=L1+ 1, according to step
It is rapid one) or two) in method, the corresponding L of traversal search2Value, user estimates current L1、L2SINR is compared in corresponding letter drying2；Most
Afterwards, judge | SINR2-SINR1| whether≤ζ sets up, the SINR if setting up1Corresponding L1、L2For the minimum cooperation base finally determined
Stand number and interference nulling base station number, the SINR if invalid2Corresponding L1、L2For the minimum cooperative base station number that finally determines and dry
Disturb zero setting base station number；Wherein, ζ dries the difference threshold of ratio for default letter；
Step 2., step one) or two) in output L1、L2Minimum cooperative base station number and interference that value is as finally determined
Zero setting base station number.
As the further technical scheme of the present invention, the letter drying that user estimates is than SINR：
Wherein, P0Represent the power of the signal for the home base stations that user receives, PiRepresent the interference of i-th of interference base station
The power of signal, PjRepresent the power of the interference signal of j-th of interference base station, σ2For the power of white Gaussian noise.
As the further technical scheme of the present invention, make L in step 31Individual cooperative base station and L2Individual interference nulling base station difference
Corresponding cooperation transmission and CS/CB interference nullings are carried out to user.
The present invention uses above technical scheme compared with prior art, with following technique effect：Application claims user
Sorted from big to small according to the received signal power from home base stations and interference base station and obtain coordinating priority, and consider user
Performance and complexity compromise, determine to participate in the collection of base stations of collaboration services and the collection of base stations of interference nulling respectively；Again
Using joint multipoint cooperative and wave beam forming so that strong jamming information is changed into useful information, secondary interference nulling, so that user
Performance gets a promotion, and keeps relatively low complexity as far as possible.Further, since user need to only feed back those to itself to home base stations
Performance boost has the interference base station information of larger effect, rather than all interference base station information, so as to reduce to a certain extent
Feedback quantity.
Brief description of the drawings
Fig. 1 is the schematic diagram of the inventive method.
Fig. 2 is interference coordination priority schematic diagram in the present invention.
User's judging process schematic diagram when Fig. 3 is M≤L.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
The present invention proposes interference coordination (the Priority based Use- based on priority customer-centric
Centric InterferenceCoordination, PUCIC) scheme, by using the thought of customer-centric, from user
The angle of performance boost is set out, balance user performance and complexity, determines that each user needs how many base station to be its cooperation clothes
Business, the interference of which base station avoided by interference nulling so that the main interference source of each user can be suppressed or
Utilize.The program is with low complexity of trying one's best so that user performance is effectively lifted, and the main bottleneck of interference network is cell
Edge customer will be resolved.
The present invention in interference coordination priority basis, is determined and this ground by using the thought of customer-centric
The base station number L stood together for its collaboration services1With the base station number L that interference nulling is carried out by home base stations2, by base station collaboration and
Wave beam forming, suppresses inter-cell interference, lifting user performance and throughput of system.The main object of the present invention is from user
Angle-determining L1And L2, and consider the compromise of user performance and the compromise of complexity and user performance and systematic entirety energy.
In addition, the CoMP that PUCIC is used is joint transmission (JT) and cooperative scheduling/wave beam forming CS/CB, i.e. L1Individual base station is entered to user
Row JT, L2Interference of the individual base station to user carries out CS/CB zero setting.
For interference base station number it is more when, in existing scheme UCIIC the problem of leaving serious interference influence user performance,
A kind of disturbance restraining method PUCIC based on priority customer-centric proposed by the present invention, as shown in figure 1, including：First,
Priority is coordinated in generation；2nd, user's judging process；3rd, cooperation transmission and interference nulling process.
First, priority is coordinated in generation.
User UE0According to the received signal power P from L interference base station aroundt(PtRepresent from t-th of interference base station
Reception signal power, t=1,2 ..., L), from big to small sequence obtain L interference base station interference coordination preferential level
Sequence is I1,I2...,IL(ItRepresent the interference signal of t-th of interference base station), as shown in Fig. 2 making Φ={ I1,I2,...,IL}。
2nd, user's judging process.
According to interference coordination priority, in turn traversal search L1And L2Value, estimate different L1And L2In the case of phase
The SINR answered, and rule out the minimum L for meeting SINR >=γ (γ is the threshold value of the minimum SINR requirements of customer service) condition1And L2,
I.e. with home base stations BS0It is user UE together0The collection of base stations Θ of collaboration services1Element number, home base stations BS0Put
Zero collection of base stations Θ2Element number, as shown in Figure 2.To maximize SINR as criterion, as much as possible consider user performance and
Compromise (the L of complexity1、L2Bigger complexity is higher, and feedback quantity is bigger), it is ultimately determined to local user's UE collaboration services base station
Number L1The base station number L of interference nulling is carried out with home base stations2。
User's estimation believes that the formula dried than SINR is(wherein, P0For this ground
Stand BS0Received signal power, Pi(i=1,2 ..., L1) be and home base stations BS0It is user UE together0The base station of collaboration services
Received signal power, Pj(j=L1+L2+ 1 ..., L) it is home base stations BS0Carry out the received signal power of the base station of zero setting, σ2
For the power of white Gaussian noise).
It is many and intensive by being then based on base station in UDN scenes, UDN, to reach customer service requirement, generally require base station association
Make, i.e. M≤L.Lower mask body is by taking M≤L situations as an example, as shown in figure 3, specifically introducing user's judging process.
(1) in the case of M≤L (M is antenna for base station number)：
User's judgement calculates L1、L2Algorithm flow chart as shown in figure 1, by being then based on UDN scenes, therefore set M herein
≤ L, is described in detail below：
1. make L1=0, user UE0Estimate L2SINR when=1, nowChecking is
It is no to meet decision condition SINR >=γ, the L if meeting2=1 is required, and L is traveled through by step 1-1 methods if being unsatisfactory for2, estimate
The SINR that user estimates in SINR, step is designated as SINR1, until meeting(note L2SINR during=n1Forn
≤ M-1) first L2Untill.According to meeting the minimum principle of complexity, L now on the basis of customer service requirement1、L2For
It is required.
Step 1-1：
1-1a. fixes L1It is constant, judge whether to meet L1+L2+ 1≤L, jumps to step 2 if being unsatisfactory for, and is made if meeting
L2=1, estimate SINR1, it is designated asIf meetingThen optimal L2=1, otherwise continue next step；
1-1b. fixes L1It is constant, judge whether to meet L1+L2+ 1≤L, jumps to step 2 if being unsatisfactory for, and is made if meeting
L2=2, estimate SINR1, it is designated asIf meetingThen optimal L2=2, otherwise continue next step；
1-1c. by that analogy, until finding satisfactionFirst L of (wherein n≤M-1)2Untill, then this L2I.e.
This L1Corresponding optimal L2。
2. make L1=1, user UE0Estimate L2The SINR that user estimates in SINR during=M-1, this step is designated as SINR2,
Verify whether to meet decision condition SINR2>=γ, jumps to step 3 if being unsatisfactory for, and is traveled through if meeting by step 1-1 method
L2, estimate SINR2, until finding satisfactionFirst L of (wherein n≤M-1)2Untill.According to meeting customer service
The minimum principle of complexity on the basis of minimum requirements, L now1、L2To be optimal.In addition, traveling through L by step 1-1 method2's
During, to meet L1+L2L is made under conditions of+1≤L2+ 1, step 3 is jumped to if condition is unsatisfactory for.
3. by that analogy, meeting L1L is made under conditions of+1≤L1+ 1 repeats the above steps, and user estimates in this step
SINR is designated as SINRc(work as L1During=c-1, the SINR that note user estimates is SINRc), until finding L2SINR is met during=M-1c
>=γ first L1, and by step 1-1 method traversal L2, estimate SINRc, until finding satisfactionFirst
L2Untill (wherein c≤L, n≤M-1, c+n≤L,For L1=c-1, L2User during=n estimates SINR).According to satisfaction
The minimum principle of complexity on the basis of customer service minimum requirements, L now1、L2To be required.
If in addition, L1L is unsatisfactory for during+11During+1≤L, then the L1And L2=0 is as optimal.By step 1-1's
Method travels through L2During, to meet L1+L2L is made under conditions of+1≤L2+ 1, the L if condition is unsatisfactory for1、L2For institute
Ask.
4. in the L of step 31On the basis of, if being unsatisfactory for L1Then this algorithm terminates+1≤L, and the L obtained by step 31、L2
To be optimal.If meeting L1+ 1≤L then makes L1+ 1, then the SINR that estimates now be designated as SINRc+1, L is traveled through by step 1-1 method2,
Estimate SINRc+1, until finding satisfactionFirst L of (wherein c+1≤L, n≤M-1, c+n+1≤L)2Untill.This
Outside, L is being traveled through by step 1-1 method2During, to meet L1+L2L is made under conditions of+1≤L2+ 1, if being unsatisfactory for bar
Then this algorithm terminates part.
5. compareWithIf meeting(wherein ζ is SINR difference threshold),
Then selectCorresponding L1、L2To be optimal；Otherwise selectCorresponding L1、L2To be optimal.It is noted here that
It is, if the L that abovementioned steps traversal search is obtained1=L, then the direct obtained result of output abovementioned steps traversal search, without than
Compared withWith
(2) in the case of M ＞ L：
As M ＞ L, all interference can use method for precoding zero setting by home base stations, without base station collaboration, therefore L1=
0, only it need to travel through L by step 1-1 methods2, obtain the minimum L for meeting SINR >=γ2.Base is required according to customer service is met
The minimum principle of complexity on plinth, L now1、L2To be optimal.
However, when SINR threshold gammas are larger, it is possible to L1When=0, in the absence of the L for meeting SINR >=γ2.Accordingly, it would be desirable to
Meeting condition L1L is made in the case of+1≤L1=1, in L1+L2On the basis of+1≤L, L is traveled through by step 1-1 method2Obtain
L1Corresponding optimal L when=12, the step 5 above execution obtains optimal L1、L2.Equally, if L1L is unsatisfactory for during+11
During+1≤L, then the L1And L2=0 is as optimal.
CompareWithIf meeting(wherein ζ is SINR difference threshold), then
SelectionCorresponding L1、L2To be optimal；Otherwise selectCorresponding L1、L2To be optimal.It is noted herein that,
If the L that abovementioned steps traversal search is obtained1=L, the then result that directly output abovementioned steps traversal search is obtained, without comparingWith
3rd, cooperation transmission and interference nulling process.Make L1Individual cooperative base station and L2Individual interference nulling base station is respectively to local use
Family carries out corresponding cooperation transmission and interference nulling.Now, from set Θ1In base station signal to user UE0For become
Useful signal, and from set Θ2Base station signal to user UE0Be still interference signal, but by CS/CB can zero setting,
That is, strong jamming information is made to be changed into useful information, secondary interference nulling.
It is described above, it is only the embodiment in the present invention, but protection scope of the present invention is not limited thereto, and appoints
What be familiar with the people of the technology disclosed herein technical scope in, it will be appreciated that the conversion or replacement expected, should all cover
Within the scope of the present invention, therefore, protection scope of the present invention should be defined by the protection domain of claims.
Claims (6)
1. a kind of inter-cell interference restraint method based on priority customer-centric, it is characterised in that including in detail below
Step：
Step 1, priority is coordinated in generation：User is according to the interfering signal power of the L interference base station received, by what is received
Interference signal sorts from big to small according to power, obtains the priority order of the interference coordination of interference base station；
Step 2, user adjudicates：According to the priority order of the interference coordination obtained in step 1, traversal interference base station determines minimum
Cooperative base station number L1With interference nulling base station number L2, wherein,；
Step 3, cooperation transmission and interference nulling：Make L1Individual cooperative base station and L2Individual interference nulling base station carries out phase to user respectively
The cooperation transmission and interference nulling answered.
2. a kind of inter-cell interference restraint method based on priority customer-centric according to claim 1, it is special
Levy and be, user is according to the power from the interference signal of L interference base station around received in step 1, by what is received
Interference signal sorts from big to small according to power, obtains the priority order I of the interference coordination of L interference base station1,I2,…,IL,
Wherein, ItRepresent the interference signal of t-th of interference base station, P1≥P2≥…≥PL, PtRepresent the interference signal of t-th of interference base station
Power, t=1,2 ..., L.
3. a kind of inter-cell interference restraint method based on priority customer-centric according to claim 2, it is special
Levy and be, minimum cooperative base station number L is determined in step 21With interference nulling base station number L2Afterwards, the priority order of interference coordination is
4. a kind of inter-cell interference restraint method based on priority customer-centric according to claim 3, it is special
Levy and be, minimum cooperative base station number L is determined in step 21With interference nulling base station number L2Method it is specific as follows：
One) in the case of M≤L, wherein, M is antenna for base station number：
1) L is made1=0, L2=1, user estimates current letter and dries ratio, if current letter is dried than being more than or equal to γ, output is worked as
Preceding L1、L2Value is as a result；If current letter is dried than being less than γ, into step 2)；Wherein, γ is that customer service is minimum
The threshold value of SINR requirements；
2) L is judged1+L2Whether+1≤L is set up, and step 4 is entered if invalid), otherwise make L2=L2+ 1, into step 3)；
3) L is judged1+L2Whether+1≤L is set up, and step 4 is entered if invalid), otherwise user estimates current letter and dries ratio,
If current letter is dried than being more than or equal to γ, current L is exported1、L2Value is as a result；If current letter is dried than being less than γ,
Return to step 2) dried until finding correspondence letter than first L more than or equal to γ2, and by the L2And corresponding L1It is used as knot
Fruit exports, and is dried if not finding correspondence letter than the L more than or equal to γ2Then enter step 4)；
4) L is made1=L1+1、L2=M-1, user estimates current letter and dries ratio, if current letter is dried than being more than or equal to γ,
Into step 5)；If current letter is dried than being less than γ, into step 8)；
5) L is made2=1, user estimates current letter and dries ratio, if current letter is dried than being more than or equal to γ, exports current L1、
L2Value is as a result；If current letter is dried than being less than γ, into step 6)；
6) L is judged1+L2Whether+1≤L is set up, and step 8 is entered if invalid), otherwise make L2=L2+ 1, into step 7)；
7) L is judged1+L2Whether+1≤L is set up, and step 8 is entered if invalid), otherwise user estimates current letter and dries ratio,
If current letter is dried than being more than or equal to γ, current L is exported1、L2Value is as a result；If current letter is dried than being less than γ,
Return to step 6) dried until finding correspondence letter than first L more than or equal to γ2, and by the L2And corresponding L1It is used as knot
Fruit exports, and is dried if not finding correspondence letter than the L more than or equal to γ2Then return to step 4)；
8) L is judged1Whether+1≤L sets up, the return to step 4 if setting up), otherwise make L2=0, export current L1And L2Value is used as knot
Really；
Two) in the case of M ＞ L：
A L) is made1=0, L2=1, user estimates current letter and dries ratio, if current letter is dried than being more than or equal to γ, output is worked as
Preceding L1、L2Value is as a result；If current letter is dried than being less than γ, into step B)；
B L) is judged1+L2Whether+1≤L is set up, and step D is entered if invalid), otherwise make L2=L2+ 1, into step C)；
C L) is judged1+L2Whether+1≤L is set up, and step D is entered if invalid), otherwise user estimates current letter and dries ratio,
If current letter is dried than being more than or equal to γ, current L is exported1、L2Value is as a result；If current letter is dried than being less than γ,
Return to step B) dried until finding correspondence letter than first L more than or equal to γ2, and by the L2And corresponding L1It is used as knot
Fruit exports, and is dried if not finding correspondence letter than the L more than or equal to γ2Then enter step D)；
D L) is judged1Whether+1≤L is set up, and step E is entered if setting up), otherwise make L2=0, export current L1And L2Value is used as knot
Really；
E L) is made1=L1+1、L2=1, user estimates current letter and dries ratio, defeated if current letter is dried than being more than or equal to γ
Go out current L1、L2Value is as a result；If current letter is dried than being less than γ, return to step E)；
Three) to step one) or two) in output L1、L2Value, judges L1Whether+1≤L is set up, and step is performed 1. if setting up,
Otherwise step is performed 2.；
1., first, user estimates current L to step1、L2SINR is compared in corresponding letter drying1；Secondly, L is made1=L1+ 1, according to step
Or two) one) method in, the corresponding L of traversal search2Value, user estimates current L1、L2SINR is compared in corresponding letter drying2；Finally,
Judge | SINR2-SINR1| whether≤ζ sets up, the SINR if setting up1Corresponding L1、L2For the minimum cooperative base station number finally determined
With interference nulling base station number, the SINR if invalid2Corresponding L1、L2It is that the minimum cooperative base station number finally determined and interference are put
Zero-base station number；Wherein, ζ dries the difference threshold of ratio for default letter；
Step 2., step one) or two) in output L1、L2Minimum cooperative base station number and interference nulling that value is as finally determined
Base station number.
5. a kind of inter-cell interference restraint method based on priority customer-centric according to claim 4, it is special
Levy and be, the letter drying that user estimates is than SINR：
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Wherein, P0Represent the power of the signal for the home base stations that user receives, PiRepresent the interference signal of i-th of interference base station
Power, PjRepresent the power of the interference signal of j-th of interference base station, σ2For the power of white Gaussian noise.
6. a kind of inter-cell interference restraint method based on priority customer-centric according to claim 1, it is special
Levy and be, L is made in step 31Individual cooperative base station and L2Individual interference nulling base station user is carried out respectively corresponding cooperation transmission and
CS/CB interference nullings.
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| CN1956342A (en) * | 2005-10-28 | 2007-05-02 | 北京邮电大学 | Method for removing interference between TDD-CDMA base station and user interference between marginal cell |
| CN102413477A (en) * | 2010-09-20 | 2012-04-11 | 大唐移动通信设备有限公司 | Simulation method for inter-cell interference coordination, and device therefor |
| WO2013029215A1 (en) * | 2011-08-26 | 2013-03-07 | Huawei Technologies Co., Ltd. | Method and apparatus for modeling a service delivered over a communication network |
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| CN1956342A (en) * | 2005-10-28 | 2007-05-02 | 北京邮电大学 | Method for removing interference between TDD-CDMA base station and user interference between marginal cell |
| CN102413477A (en) * | 2010-09-20 | 2012-04-11 | 大唐移动通信设备有限公司 | Simulation method for inter-cell interference coordination, and device therefor |
| WO2013029215A1 (en) * | 2011-08-26 | 2013-03-07 | Huawei Technologies Co., Ltd. | Method and apparatus for modeling a service delivered over a communication network |
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| WO2021093169A1 (en) * | 2020-01-19 | 2021-05-20 | Zte Corporation | Methods and systems for nulling in wireless communication networks |
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