CN106028371B - The dynamic TDD configuration method of serial interference between a kind of reduction microcell cluster - Google Patents
The dynamic TDD configuration method of serial interference between a kind of reduction microcell cluster Download PDFInfo
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
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- H04W52/143—Downlink power control
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- H—ELECTRICITY
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Abstract
The dynamic TDD configuration method of serial interference, belongs to mobile communication field between a kind of reduction microcell cluster of the present invention；Specifically: firstly, counting each microcell cluster respectively by remaining all microcell cluster to itself interference value；Then, interference value is divided into grade 1 from big to small to grade C；The microcell cluster that grade 1 is arranged is Target cell cluster, other cell clusters are defined as adjacent cell cluster.Finally, matching UL-DL sub-frame configuration mode respectively for Target cell cluster and adjacent cell cluster, Target cell cluster is reported to all base stations and adjacent cell cluster cluster head in cluster；After adjacent cell cluster is compared with the configuration mode of Target cell cluster, the UL-DL sub-frame configuration mode after comparison is reported to all base stations in cluster by adjacent cell cluster.Advantage is: comprehensively considering interference value and service adaptation, by setting downlink transmission power decreasing value, and the signalling interactive process between hard objectives cell cluster and neighboring community's cluster, reduces and interfere lifting system performance between cell cluster.
Description
Technical field
The invention belongs to mobile communication field, a kind of dynamic TDD configuration of serial interference between reduction microcell cluster is described
Method.
Background technique
The following 5G network is the network shape of a variety of access technologies of collection, a variety of deployment scenarios and the fusion of a variety of connection types
State needs to meet the business demand of various users.It is disposed using micro-base station super-intensive, improves the handling capacity in traffic hotspots area,
It is the trend of next generation wireless network development.Serial interference in super-intensive network between adjacent micro-base station is particularly evident, seriously
Influence system average throughput, the effective way to manage generallyd use in response to this problem are to carry out sub-clusteringization to cell to concentrate control
System；
Relatively conventional cell cluster-dividing method is based on dynamic clusterings modes such as business load, interference level thresholdings.Sub-clustering
It is interfered afterwards by using identical ascending-descending subframes configuration mode to completely eliminate in cluster in cluster, but serial interference is still between cluster at this time
In the presence of each base station can be will cause system by interference of all base stations to it in downlink cluster, this interference especially in uplink cluster
Serious interference peak, the interference mean value even higher than in the case of not sub-clustering, therefore solve the problems, such as between cluster serial interference gesture must
Row.
Ascending-descending subframes dynamic configuration scheme in TDD network is proposed in 3GPP Rel-11, according to cell uplink and downlink load capacity
The time slot proportion of uplink and downlink is reconfigured, to adapt to current traffic situations, efficiently utilize resource and shorten data
Packet propagation delay time.In dynamic TDD system, the advantages of sub-clustering scheme has developed dynamic TDD network, match in each TDD uplink and downlink
It sets before the period starts execution, it will it is analyzed according to the communication traffic conditions of each cell in each cluster, it should in determinant
The uplink and downlink resource distribution situation that moment should execute, as the uplink-downlink configuration that will start.However, dynamic adjusts in real time
Technology is that system performance brings the serial interference that serious uplink and downlink between cluster has also been introduced while promotion, the communication to system
Ability causes serious influence, especially for uplink, it is therefore necessary to consider serial interference coordinate scheme between cluster.
The mechanism of production of serial interference as shown in Figure 1, be directed to cell cluster 1 and cell cluster 2, the base station in cell cluster 1 to
Family carries out the downlink transfer of signal, and the user in cell cluster 2 carries out the uplink of signal, cell cluster 1 and cell cluster 2 to base station
It closes on, produces collision, to all bring interference to the base station Pico and user.Such as 21 meeting of base station pico in cell cluster 2
The interference to it simultaneously by base station pico 11 all in cell cluster 1, pico 12 ... pico 1M, this interference is strongly
's.
In the prior art, " the adaptive UL-DL configuration in TDD heterogeneous network " of Publication No. CN103517327A, mentions
A kind of technology of business unloading, the low interference for generating adaptive uplink and downlink TDD sub-frame configuration in heterogeneous network are flexible out
Subframe (FlexSF).The business load monitoring metrics regulation business loading environment of base station will be scheduled to when reaching condition
The packet business of macro user is from the FlexSF of UL-DL sub-frame configuration that macrocell is unloaded to Microcell.Wherein the base station can be with
It is that macro base station is also possible to micro-base station；In addition the regulation business loading environment from control information determine, including cell (it is macro or
It is micro-) buffer status of current ink (DL or UL), DL the or UL cell spectrum efficiency on current subframe, picocell be adapted to TDD
The ability of configuration, minizone path gain, Microcell receive ability of additional UE etc..
" the side based on the base station business load dynamic configuration TDD ascending-descending subframes ratio of Publication No. CN103023614A
Method " discloses a kind of TDD ascending-descending subframes based on service feature information that can be applied to next-generation TDD wireless communication system
Dynamic Configuration.Different " service feature letters can be selected according to different optimization aims, different implementation complexity etc.
Foundation of the breath " as TDD ascending-descending subframes ratio dynamic configuration can be real by the way that TDD ascending-descending subframes ratio is adjusted flexibly
Now to the Optimum Matching of current network traffic state, to achieve the purpose that effectively improve network system performance.
A kind of method of change TDD uplink-downlink configuration of Publication No. " CN 103188797A "；This method comprises: user
Interference of the device measuring adjacent cell user equipment to it, and disturbed condition is reported to base station, base station is reported according to user equipment
Disturbed condition and current uplink and downlink business demand, change current uplink and downlink TDD configuration.With the application of the invention, can be
It does not cause between serious neighboring community to adapt to the uplink and downlink business load demand of dynamic change under disturbed condition.
Almost without interference problem between research cluster in current existing invention, most of is based on cross-layer between macro and micro
Interference, is had plenty of to be changed based on service dynamic and configures, but the degree specifically to be changed and is not specified, and is had plenty of based on predicted interference
Be worth option and installment mode, if predict interference it is very big, do not change configuration, but which limit service adaptations.
Summary of the invention
The present invention, due to serial interference strong between cluster, directly affects net in existing wireless communications heterogeneous network
Network handling capacity and user's QoS performance, propose it is a kind of reduction microcell cluster between serial interference dynamic TDD configuration method；
Specific steps are as follows:
Step 1: calculating microcell cluster i by small for two microcell clusters i and j in some macrocell coverage area
The interference value I of area cluster jij；
In microcell cluster i the quantity of all micro-base stations be M, m=1,2 ..., M；
In microcell cluster j the quantity of all micro-base stations be N, n=1,2 ..., N.
Specific step is as follows:
Step 101, for some micro-base station m in microcell cluster i, calculate micro-base station m by micro- base in microcell cluster j
Stand the interference value I of nn-m；
In-m=Pn+TAGn+RAGm-PLn-m- SD=Pn+MCLn-m
Wherein, MCLn-mFor the coupling loss between micro-base station m and micro-base station n:
MCLn-m=TAGn+RAGm-PLn-m-SD；
PnIt is the transmission power of micro-base station n；TAGnIt is the transmission antenna gain of micro-base station n；RAGmIt is the reception of micro-base station m
Antenna gain；PLn-mIt is the path loss between micro-base station m and micro-base station n；SD is shadow fading.
Step 102, for the micro-base station m in microcell cluster i, calculate micro-base station m by micro- bases all in microcell cluster j
The interference value I to standm-j；
Im-j=I1-m+I2-m+...+In-m+...IN-m
Step 103, successively to each micro-base station in microcell cluster i, calculate separately each micro-base station by microcell cluster j
The interference value of interior all micro-base stations finally obtains the interference value I of microcell cluster i Yu microcell cluster jij；
Iij=I1-j+I2-j+...+Im-j+...IM-j
Step 2: being directed to microcell cluster i, all microcell clusters in macrocell coverage area are calculated separately to microcell cluster
The interference value of i
Formula is as follows:
All microcell cluster collection in macrocell coverage area be combined into 1,2 ..., i ..., j ... C；i≠j；
Step 3: calculating separately remaining all microcell cluster pair for each microcell cluster in macrocell coverage area
The interference value of current micro cell cluster；
Interfere value set are as follows:
Step 4: all microcell clusters are divided into grade 1 by descending order and are arrived by the interference value of remaining microcell cluster
Grade C；
Step 5: disturbance level message is notified that, to each microcell cluster, it is 1 that disturbance level, which is arranged, by cluster head by macro base station
Microcell cluster is Target cell cluster, other cell clusters are defined as adjacent cell cluster.
Interference message format is as follows:
I1≠I2≠...≠In,...≠IC；n∈{1,2,...C}
Step 6: Target cell cluster matches UL-DL sub-frame configuration mode according to service adaptation principle, and pass through cluster head
It is reported to all base stations and adjacent cell cluster cluster head in cluster.
Service adaptation principle selects matched frame configuration mode according to portfolio in cluster；
The sub- configuration mode of UL-DL has 7 kinds, and format is as follows:
Step 7: adjacent cell cluster is a kind of UL-DL sub-frame configuration mode of each Self Matching according to portfolio in cluster；And and target
The configuration mode of cell cluster is compared；
Specifically:
Step 701, each adjacent cell cluster select initial UL-DL subframe to match respectively according to service adaptation principle
Mode；
Step 702 successively chooses adjacent cell cluster as current adjacent cell cluster, judges matched uplink in current adjacent cell cluster
Whether the subframe UL subframe moment corresponds to the subframe moment in the sub-frame of uplink UL of Target cell cluster, if so, not changing adjacent cell
The UL-DL sub-frame configuration mode of cluster；Enter step 705；Otherwise, 703 are entered step；
Step 703, the subframe moment for searching sub-frame of uplink UL in Target cell cluster, corresponding current adjacent cell cluster match mould
The subframe moment of downlink subframe DL in formula is adjusted on the basis of current adjacent cell cluster existing match pattern, makes new match
It sets 1 more than subframe moment of the subframe moment than sub-frame of uplink UL in former configuration mode of sub-frame of uplink UL in mode；
Step 704 judges to whether there is current adjacent cell cluster UL-DL sub-frame configuration mode adjusted, if it does,
The UL-DL sub-frame configuration mode of current adjacent cell cluster is modified, otherwise keeps present mode constant, enters step 705；
Step 705, to the subframe moment of the downlink subframe DL in the UL-DL sub-frame configuration mode of current adjacent cell cluster, look into
Look for it is whether corresponding with the subframe moment of sub-frame of uplink UL in Target cell cluster, if it is, base station is in current adjacent cell cluster
The subframe moment of downlink subframe DL, which reduces, sends power Δ, and otherwise, base station need not reduce transmission power.
Δ is adjusted value under the conditions of meeting the minimum-rate of downlink subframe DL of current adjacent cell cluster, according to not
Same concrete scene setting, is qualitative value.
Own Step 8: each adjacent cell cluster is reported to the UL-DL sub-frame configuration mode after comparison in cluster by cluster head
Base station.
The present invention has the advantages that
1, the present invention it is a kind of reduce microcell cluster between serial interference dynamic TDD configuration method, obtained by interference measurement
Being disturbed influences maximum cell cluster, is obviously improved system performance by reducing the interference of this cell cluster.
2, the present invention it is a kind of reduce microcell cluster between serial interference dynamic TDD configuration method, by setting base station between mutually
The signaling process communicated, the signalling interactive process between hard objectives cell cluster and neighboring community's cluster, and set downlink and send function
Rate adjusted value further decreases the interference to target cluster.
3, the present invention it is a kind of reduce microcell cluster between serial interference dynamic TDD configuration method, not only utmostly meet
Customer service adaptivity demand, while solving interference problem between cell cluster.
4, a kind of dynamic TDD configuration method for reducing serial interference between microcell cluster of the present invention, comprehensively considers serial between cluster
Interference value and service adaptation are substantially unaffected cell cluster business demand under disturbed condition between reducing cluster.
Detailed description of the invention
Fig. 1 is the mechanism of production figure of serial interference in the prior art；
Fig. 2 is the dynamic TDD configuration method flow chart of serial interference between a kind of reduction microcell cluster of the present invention；
Fig. 3 is interference value I of the microcell cluster i of the present invention by cell cluster jijMethod flow diagram；
Fig. 4 is the schematic diagram of 7 kinds of sub- configuration modes of UL-DL of the invention；
Fig. 5 is that the configuration mode of adjacent cell cluster of the present invention is compared in each subframe with the configuration mode of Target cell cluster
Compared with flow chart；
Fig. 6 is the scene figure used in the specific embodiment of the invention；
Fig. 7 is the dynamic TDD configuration method schematic diagram that the present invention reduces serial interference between microcell cluster.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in further detail.
The dynamic TDD configuration method of serial interference passes through compared with prior art between a kind of reduction microcell cluster of the present invention
The frame configuration mode of cluster where changing downlink frame, so that the current subframe moment downlink frame under new configuration mode becomes uplink frame,
To reduce the interference between cell cluster；And further setting downlink transmission power adjusted value solves future 5G super-intensive networking scene
Under micro-base station cluster between interference.
As shown in Fig. 2, specific steps are as follows:
Step 1: calculating microcell cluster i by small for two microcell clusters i and j in some macrocell coverage area
The interference value I of area cluster jij；
In microcell cluster i the quantity of all micro-base stations be M, m=1,2 ..., M；
In microcell cluster j the quantity of all micro-base stations be N, n=1,2 ..., N.
As shown in Figure 3, the specific steps are as follows:
Step 101, for some micro-base station m in microcell cluster i, calculate micro-base station m by micro- base in microcell cluster j
Stand the interference value I of nn-m；
In-m=Pn+TAGn+RAGm-PLn-m- SD=Pn+MCLn-m
Wherein, MCLn-mFor the coupling loss between micro-base station m and micro-base station n:
MCLn-m=TAGn+RAGm-PLn-m-SD；
PnIt is the transmission power of micro-base station n；TAGnIt is the transmission antenna gain of micro-base station n；RAGmIt is in microcell cluster i
The receiving antenna gain of micro-base station m；PLn-mIt is the path loss between micro-base station m and micro-base station n；SD is shadow fading.
Step 102, for the micro-base station m in microcell cluster i, calculate micro-base station m by micro- bases all in microcell cluster j
The interference value I to standm-j；
Im-j=I1-m+I2-m+...+In-m+...IN-m
N is the quantity of all micro-base stations in microcell cluster j；
Step 103, successively to each micro-base station in microcell cluster i, calculate separately each micro-base station by microcell cluster j
The interference value of interior all micro-base stations finally obtains the interference value I of microcell cluster i Yu microcell cluster jij；
Iij=I1-j+I2-j+...+Im-j+...IM-j
Micro-base station quantity in microcell cluster i is M；M=1,2 ..., M.
Step 2: being directed to microcell cluster i, all microcell clusters in macrocell coverage area are calculated separately to microcell cluster
The interference value of i
Remaining all cell cluster that microcell cluster i is subject to carry out summation to its interference value and summarize to obtainFormula is as follows:
All microcell cluster collection in macrocell coverage area be combined into 1,2 ..., i ..., j ... C；i≠j；
Step 3: calculating separately remaining all microcell cluster pair for each microcell cluster in macrocell coverage area
The interference value of current micro cell cluster；
Interfere value set are as follows:
Step 4: all microcell clusters are divided into grade 1 by descending order and are arrived by the interference value of remaining microcell cluster
Grade C；
It is grade 1, grade 2 ... ... grade C that grade 1, which arrives grade C,；Disturbance level is higher, and the interference for referring to that the cluster is subject to is got over
Greatly, without referring to that the cluster is bigger to the interference of other cluster, if power adjustment is too many, it will affect the cluster performance instead.
Step 5: disturbance level message is notified that, to each microcell cluster, it is 1 that disturbance level, which is arranged, by cluster head by macro base station
Microcell cluster is Target cell cluster, other cell clusters are defined as adjacent cell cluster；
Interference message format is as follows:
I1≠I2≠...≠In,...≠IC；n∈{1,2,...C}.
Step 6: Target cell cluster selects a kind of UL-DL sub-frame configuration mode according to service adaptation principle, and pass through
Cluster head is reported to all base stations and adjacent cell cluster cluster head in cluster.
Service adaptation principle is that a kind of and most matched frame configuration mode of business is selected according to portfolio in cluster；Such as
Downlink business is more, selects the configuration that downlink subframe is more, and uplink service is more, selects the configuration that sub-frame of uplink is more, to select
Place optimum frame configuration mode { 0,1,2,3,4,5,6 } is selected, and passes through cluster head the information reporting to base stations all in cluster and neighbour
Cell cluster cluster head.
As shown in figure 4, the sub- configuration mode of UL-DL has 7 kinds, format is as follows:
Step 7: each adjacent cell cluster selects a kind of UL-DL sub-frame configuration mode according to portfolio in cluster；And it will be respective
The configuration mode of configuration mode and Target cell cluster is compared in each subframe；
Since the interference that Target cell cluster is subject to is maximum, disturbance level highest, in order to reduce to the serial of Target cell cluster
Interference, while meeting the business demand in adjacent cell cluster, adjacent cell cluster head first selects best UL-DL subframe according to portfolio in cluster
Then the configuration mode is compared in each subframe by configuration mode with configuration mode used in Target cell cluster；If
There is the DL subframe moment to correspond to the UL subframe moment in Target cell cluster in adjacent cell cluster, then need to change adjacent cell cluster configuration mode,
Make in new configuration mode that UL subframe number is 1 more than former configuration mode UL subframe number, to make there are more UL in adjacent cell cluster
The frame moment is corresponding with the UL subframe moment in target cluster, to reduce the serial interference to Target cell cluster, still, if new configuration
There are still the DL subframe moment in mode to correspond to Target cell cluster UL subframe, then does not consider to continue growing UL subframe number, thus will not
Business demand satisfaction degree in adjacent cell cluster is influenced, at this time then considers to reduce DL subframe hair under the conditions of meeting DL minimum-rate
Power is sent to further decrease interference.
As shown in figure 5, specifically:
Step 701, each adjacent cell cluster select initial UL-DL subframe to match respectively according to service adaptation principle
Mode；
When adjacent cell cluster sends DL signal, it is right simultaneously that Target cell cluster UL transmission will receive all base stations in adjacent cell cluster
Its serial interference is interfered between this strong cluster to reduce, novel dynamic TDD configuration technology is used on adjacent cell cluster,
Best UL-DL sub-frame configuration mode is selected according to portfolio in itself cluster, when secondly making UL subframe in i.e. adjacent cell cluster as far as possible
Carve UL subframe moment, micro-adjustment frame configuration mode in corresponding Target cell cluster.
Step 702 successively chooses adjacent cell cluster as current adjacent cell cluster, judges matched uplink in current adjacent cell cluster
Whether the subframe UL subframe moment corresponds to the subframe moment in the sub-frame of uplink UL of Target cell cluster, if so, not changing adjacent cell
The UL-DL sub-frame configuration mode of cluster；Enter step 705；Otherwise, 703 are entered step；
Step 703, search Target cell cluster in UL subframe moment corresponding adjacent cell cluster the DL subframe moment, current
It is adjusted on the basis of the existing match pattern of adjacent cell cluster, makes in new configuration mode the UL subframe moment than in former configuration mode
The UL subframe moment more 1；
Step 704 judges to whether there is current adjacent cell cluster UL-DL sub-frame configuration mode adjusted, if it does,
The UL-DL sub-frame configuration mode of current adjacent cell cluster is modified, otherwise keeps present mode constant, enters step 705；
Step 705, to the subframe moment of the downlink subframe DL in the UL-DL sub-frame configuration mode of current adjacent cell cluster, look into
Look for it is whether corresponding with the subframe moment of sub-frame of uplink UL in Target cell cluster, if it is, base station is in current adjacent cell cluster
The downlink subframe DL moment, which reduces, sends power Δ, and otherwise, base station need not reduce transmission power.
Δ is adjusted value under the conditions of meeting the minimum-rate of downlink subframe DL of current adjacent cell cluster, according to not
Same concrete scene setting, is qualitative value.
Step 8: each adjacent cell cluster is reported to the UL-DL sub-frame configuration mode after comparing in cluster in cluster by cluster head
All base stations.
Embodiment:
User is deployed in a wireless communication heterogeneous network under super-intensive networking scene, and macro base station for covering substantially
M micro-base station is formed one for filling covering cavity, improving hot spot region capacity, according to service adaptation by lid, micro-base station
A cell cluster, conveniently manages and controls, and is configured in each cluster using identical TDD ascending-descending subframes, and a macrocell packet
Containing C microcell cluster.As shown in Figure 6, it is assumed that have 3 microcell clusters, respectively microcell cluster in a macrocell coverage area
1, microcell cluster 2 and microcell cluster 3, microcell cluster 1 include 3 micro-base stations, respectively base station IDs 11, base station IDs 12 and base station
ID13；Microcell cluster 2 includes 3 micro-base stations, respectively base station IDs 21, base station IDs 22 and base station IDs 23；Microcell cluster 3 includes 3
A micro-base station, respectively base station IDs 31, base station IDs 32 and base station IDs 33.
First, by being interfered between calculating coupling loss method acquisition cluster；Coupling loss method can be replaced with other methods.
(1) the coupling loss MCL between micro-base station is first calculated:
The coupling loss MCL calculation formula of micro-base station 11 and micro-base station 21:
MCL21-11=TAG21+RAG11-PL21-11-SD
Wherein TAG21: the transmission antenna gain of micro-base station 21；RAG11: the receiving antenna gain of micro-base station 11；PL21-11: it is micro-
Path loss between base station 11 and micro-base station 21；SD: shadow fading.
(2) interference of the micro-base station 21 to micro-base station 11 is calculated:
I21-11=P21+TAG21+RAG11-PL21-11- SD=P21+MCL21-11
Wherein P21It is the transmission power of micro-base station 21；
(3) similarly calculate interference of other base stations to micro-base station 11, and sum obtain that micro-base station 11 is subject to it is total dry
Disturb I11, successively calculate I12、I13, then the interference I of cell cluster 1 is subject to adjacent area cluster to it1:
I1=ΣI11+I12+I13
Similarly calculate I2、I3, sort to obtain I1> I3> I2
Then, each microcell cluster cluster head obtains disturbance level message:
I.e. microcell cluster 1 is Target cell cluster, and microcell cluster 2 and microcell cluster 3 are adjacent cell cluster.
Microcell cluster 1 selects optimum frame configuration mode 6 according to service adaptation, and the information reporting is given by cluster head
All base stations and adjacent cell cluster cluster head in cluster；
For microcell cluster 2 according to own service demand primary election TDD configuration mode 0, corresponding UL-DL subframe proportion is 6:4；It is small
For area's cluster 3 according to own service demand primary election TDD configuration mode 3, corresponding UL-DL subframe proportion is 3:7
By corresponding to the used configuration mode UL subframe moment of adjacent cell cluster 2 and Target cell cluster 1, so not needing again
Fine tuning mode；But the used configuration mode of adjacent cell cluster 3 is DL subframe at subframe 7,8 moment, and Target cell cluster 1 is corresponding
The subframe moment be UL subframe, such adjacent cell cluster 3 can cause serious serial interference to Target cell cluster 1, therefore will be adjacent small
Cluster 3 configuration mode in area's is tailored into mode 1, and corresponding UL-DL subframe proportion is 4:6, is substantially meeting 3 business of adjacent cell cluster certainly in this way
The interference to cluster 1 is reduced while adaption demand.
For adjacent cell cluster 3 using after configuration mode 1,4 moment of subframe is still DL subframe, in order to further decrease interference, it is desirable that
Base station reduces at the subframe moment and sends power in adjacent cell cluster 3, and decreasing value is Δ.
Regardless of being configured either with or without change frame, as long as there is adjacent cell cluster DL subframe to correspond to target cluster UL subframe it is necessary in the DL
Subframe reduces power.Three kinds of scenes: scene 1 can be divided: adjacent cell cluster UL subframe number includes target cluster UL subframe number, so being not required to
Adjust the configuration of adjacent cell cluster frame；Scene 2: the frame configuration after adjusting subframe to adjacent cell cluster is not present, and it is adjacent to be also not required to adjustment at this time
The configuration of cell cluster frame；Scene 3: the frame after adjusting subframe to adjacent cell cluster, which configures, to be existed, and is needed to adjust adjacent cell cluster frame at this time and is matched
It sets.It is all to need further adjustment performance number to further decrease the interference value to target cluster for scene 2 and 3.
Finally, frame configuration mode used in the cluster is reported to all base stations in cluster by cluster head by each adjacent cell cluster,
Configure base station in cluster using identical TDD.
As shown in fig. 7, target cluster is configured message by macro base station first and disturbance level message is sent to Target cell cluster head,
Adjacent area cluster is configured message and disturbance level message is sent to adjacent cell cluster head, so that each cell cluster can perceive entire net
Network performance and configuration message, and then make corresponding adjustment.After adjustment, Target cell cluster head is Target cell cluster
It is currently configured message and power adjustment situation and is sent to all base stations in target cluster, so that it is identical to use base station
TDD configuration.Similarly the cell cluster is currently configured message by adjacent cell cluster head and power adjustment situation is sent in the cluster and owns
Base station, so that base station in cluster be made to configure using identical TDD.
The present invention by combine dynamic real-time measurement channel conditions and coupling loss model obtain in a macrocell by
The maximum cell cluster of interference effect is as Target cell cluster, and on the basis of conventional dynamic TDD configuration technology, setting reduces collection
UL-DL configuration, and design specific signaling process come control neighboring community cluster TDD configuration selection, and by reduce DL power come
The interference to Target cell cluster is further decreased, by the control of macro base station, reduces the Microcell in macrocell coverage area
Serial interference between cluster.
Claims (2)
1. the dynamic TDD configuration method of serial interference between a kind of reduction microcell cluster, which is characterized in that specific step is as follows:
Step 1: calculating microcell cluster i by cell cluster for two microcell clusters i and j in some macrocell coverage area
The interference value I of jij；
In microcell cluster i the quantity of all micro-base stations be M, m=1,2 ..., M；
In microcell cluster j the quantity of all micro-base stations be N, n=1,2 ..., N；
Specifically:
Step 101, for some micro-base station m in microcell cluster i, calculate micro-base station m by micro-base station n in microcell cluster j
Interference value In-m；
In-m=Pn+TAGn+RAGm-PLn-m- SD=Pn+MCLn-m
Wherein, MCLn-mFor the coupling loss between micro-base station m and micro-base station n:
MCLn-m=TAGn+RAGm-PLn-m-SD；
PnIt is the transmission power of micro-base station n；TAGnIt is the transmission antenna gain of micro-base station n；RAGmIt is the receiving antenna of micro-base station m
Gain；PLn-mIt is the path loss between micro-base station m and micro-base station n；SD is shadow fading；
Step 102, for the micro-base station m in microcell cluster i, calculate micro-base station m by all micro-base stations in microcell cluster j
Interference value Im-j；
Im-j=I1-m+I2-m+...+In-m+...IN-m
Step 103, successively to each micro-base station in microcell cluster i, calculate separately each micro-base station by institute in microcell cluster j
There is the interference value of micro-base station, finally obtains the interference value I of microcell cluster i Yu microcell cluster jij；
Iij=I1-j+I2-j+...+Im-j+...IM-j；
Step 2: being directed to microcell cluster i, all microcell clusters in macrocell coverage area are calculated separately to microcell cluster i's
Interference value
Formula is as follows:
All microcell cluster collection in macrocell coverage area be combined into 1,2 ..., i ..., j ... C；i≠j；
Step 3: calculating separately remaining microcell cluster to current small for each microcell cluster in macrocell coverage area
The interference value of area's cluster；
Interfere value set are as follows:
Step 4: being divided into grade 1 to grade by descending order by all microcell clusters by the interference value of remaining microcell cluster
C；
Step 5: macro base station notifies disturbance level message to each microcell cluster by cluster head, be arranged disturbance level be 1 it is small
Area's cluster is Target cell cluster, other cell clusters are defined as adjacent cell cluster；
Interference message format is as follows:
I1≠I2≠...≠In,...≠IC；n∈{1,2,...C}；
Step 6: Target cell cluster matches UL-DL sub-frame configuration mode according to service adaptation principle, and reported by cluster head
To base stations all in cluster and adjacent cell cluster；
Step 7: adjacent cell cluster is a kind of UL-DL sub-frame configuration mode of each Self Matching according to portfolio in cluster；And and Target cell
The configuration mode of cluster is compared；Specifically:
Step 701, each adjacent cell cluster select initial UL-DL subframe to match mode respectively according to service adaptation principle；
Step 702 successively chooses adjacent cell cluster as current adjacent cell cluster, judges matched sub-frame of uplink in current adjacent cell cluster
Whether the UL subframe moment corresponds to the subframe moment in the sub-frame of uplink UL of Target cell cluster, if so, not changing adjacent cell cluster
UL-DL sub-frame configuration mode；Enter step 705；Otherwise, 703 are entered step；
Step 703, the subframe moment for searching sub-frame of uplink UL in Target cell cluster, in corresponding current adjacent cell cluster match pattern
The subframe moment of downlink subframe DL is adjusted on the basis of current adjacent cell cluster existing match pattern, makes new configuration mould
In formula 1 more than subframe moment of the subframe moment of sub-frame of uplink UL than sub-frame of uplink UL in former configuration mode；
Step 704 judges to whether there is current adjacent cell cluster UL-DL sub-frame configuration mode adjusted, if it does, will work as
The UL-DL sub-frame configuration mode of preceding adjacent cell cluster is modified, and is otherwise kept present mode constant, is entered step 705；
Step 705, to the subframe moment of the downlink subframe DL in the UL-DL sub-frame configuration mode of current adjacent cell cluster, lookup is
It is no corresponding with the subframe moment of sub-frame of uplink UL in Target cell cluster, if it is, downlink of the base station in current adjacent cell cluster
The subframe moment of subframe DL, which reduces, sends power Δ, and otherwise, base station need not reduce transmission power；
Δ is adjusted value under the conditions of meeting the minimum-rate of downlink subframe DL of current adjacent cell cluster, according to different
Concrete scene setting is qualitative value；
Step 8: the UL-DL sub-frame configuration mode after comparison is reported to all base stations in cluster by cluster head by each adjacent cell cluster.
2. the dynamic TDD configuration method of serial interference, feature exist between a kind of reduction microcell cluster as described in claim 1
In the sub- configuration mode of UL-DL described in step 6 has 7 kinds, and format is as follows:
Service adaptation principle selects matched frame configuration mode according to portfolio in cluster.
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