CN104980942A - Power control method in communication network, base station, and communication system - Google Patents
Power control method in communication network, base station, and communication system Download PDFInfo
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Abstract
The embodiment of the invention provides a power control method in a communication network, a base station, and a communication system. The power control method comprises: A, performing power distribution in the first dimensionality of the communication network in order to obtain a first power distribution result; B, determining whether the first power distribution result satisfies a stable condition, and ending the power control if yes or executing the step C if not; C, performing power distribution in the second dimensionality of the communication network in order to obtain a second power distribution result; and D, determining whether the second power distribution result satisfies the stable condition, and ending the power control if yes or executing the step A if not. The power control method, the base station, and the communication system achieve balance between interference and resource utilization efficiency.
Description
Technical field
The present invention relates to the communications field, the Poewr control method in espespecially a kind of communication network, base station, and communication system.
Background technology
For the data growth pattern in communication network, solve by deployable communication community, small-cell (small cell, SC) disposes is exactly wherein a solution.As shown in Figure 1, the small-cell distance each other of early deployment is comparatively large, and the interference between small-cell can be ignored.But the deployment of existing small-cell is intensive and random.As can be seen from Figure 1, the small-cell of multiple close together constitutes small-cell group, also there is the overlay area overlapped between these small-cell groups, and this brings challenge to the management of area interference.Small-cell for concentrated type is disposed, and disturbs and will become the bottleneck promoting throughput.Existing almost blank subframe (ABS, almost blank subframe) scheme, soft-frequency reuse (SFR, soft frequency reuse) etc. time-frequency orthogonal scheme the small-cell of concentrated type be deployed in performance boost produce little effect, such as ABS configuration is complicated, and the resource utilization of SFR is low.
Summary of the invention
The invention provides the Poewr control method in a kind of communication network, base station, and communication system.
Particularly, embodiments provide the Poewr control method in a kind of communication network, comprising:
A, carry out power division in the first dimension of described communication network, obtain the first power distribution result;
B, judge whether described first power distribution result meets stable condition, if met, described power controls to terminate, otherwise performs step C;
C, carry out power division in the second dimension of described communication network, obtain the second power distribution result;
D, judge whether described second power distribution result meets stable condition, if met, described power controls to terminate, otherwise performs steps A.
In an embodiment of the invention, described first dimension is one of them dimension of communication cell dimension and frequency dimension, and described second dimension is another dimension in described communication cell dimension and described frequency dimension.
In an embodiment of the invention, when described first dimension or the second dimension are frequency dimension, carry out power division in the frequency dimension of described communication network and comprise:
The collection division of combining carried out in m sub-bandwidth obtains one or more alternative collection of combining, and described alternative collection of combining comprises one or more communication cell, and wherein the value of m is 1 ..., M, M are the wide number of subband in described communication network;
According to user terminal feedback measurement report calculate described alternative combine concentrated each communication cell strengthen the property and independent performance, the strengthening the property of described communication cell to combine the performance that concentrated other communication cells one or more are in this communication cell under off position for this is alternative, the independent performance of described communication cell is this alternative performance of combining all in running order this communication cell lower, concentrated all communication cells;
Judge whether strengthening the property of this communication cell is greater than the independent performance of this communication cell, carries out power configuration according to described judged result;
If described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, make this effectively combine concentrated other communication cells one or more and give up this m sub-bandwidth, and make described other communication cell one or more determining that power becomes and can distribute power in this m sub-bandwidth; Otherwise, do not change this and alternatively combine concentrated each communication cell determine power in described m sub-bandwidth.
In an embodiment of the invention, describedly judge that the independent performance whether being greater than this communication cell of strengthening the property of this communication cell comprises:
Obtain described alternative independent performance of combining other communication cell concentrated;
The Performance Score of this communication cell is calculated with described alternative independent performance of combining concentrated all communication cells according to strengthening the property of this communication cell;
Determine whether the Performance Score of this communication cell is greater than the independent performance of this communication cell.
In an embodiment of the invention, described step B comprises:
When described first dimension is frequency dimension, this first power distribution result and first power distribution result of last time are compared;
If there is not giving up of new communication cell antithetical phrase bandwidth in this first power distribution result, then terminate described power and control, otherwise perform step C.
In an embodiment of the invention, described step D comprises:
When described second dimension is frequency dimension, this second power distribution result and second power distribution result of last time are compared;
If there is not giving up of new communication cell antithetical phrase bandwidth in this second power distribution result, then terminate described power and control, otherwise perform steps A.
In an embodiment of the invention, when described first dimension or the second dimension are communication cell dimension, carry out power division in the communication cell dimension of described communication network and comprise:
The associating collection division carried out on the n-th communication cell obtains one or morely alternatively combining collection, describedly alternatively combines collection to comprise one or more subband wide, and wherein the value of n is 1 ..., N, N are the communication cell number in described communication network;
According to user terminal feedback measurement report calculate described alternative combine concentrated each subband wide strengthen the property and independent performance, what described subband was wide strengthen the property for this is alternative combines that concentrated other subbands one or more are wide does not distribute power and by the wide performance taking rated power of this subband, and the wide independent performance of described subband is that this alternatively combines the wide performance of wide all in running order this subband lower of concentrated all subbands;
Judge whether wide the strengthening the property of this subband is greater than the wide independent performance of this subband, carries out power configuration according to described judged result;
If described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, this is effectively combined, and concentrated other subbands one or more are wide gives up this n-th communication cell, and make wide the determining that power becomes and can distribute power on this n-th communication cell of described other subband one or more; Otherwise, do not change this and alternatively combine that concentrated each subband is wide determines power on described n-th communication cell.
In an embodiment of the invention, when described first dimension or the second dimension are communication cell dimension, carry out power division in the communication cell dimension of described communication network and comprise:
For each communication cell of described communication network, power can be distributed according to the measurement report of user terminal feedback and configure to one or more subbands of this communication cell wide according to preset rules.
In an embodiment of the invention, described step B comprises:
When described first dimension is communication cell dimension, this first power distribution result wide for subband each in described communication cell and first power distribution result of last time are compared;
Comparative result and pre-determined threshold are compared, if be less than described pre-determined threshold, terminate described power and control, otherwise perform step C.
In an embodiment of the invention, described step D comprises:
When described second dimension is communication cell dimension, this second power distribution result wide for subband each in described communication cell and second power distribution result of last time are compared;
Comparative result and pre-determined threshold are compared, if be less than described pre-determined threshold, terminate described power and control, otherwise perform steps A.
Particularly, embodiments provide a kind of base station, comprising:
Power control module, for the measurement report that the user terminal receiving this base station coverage provides, the power division of carrying out the first dimension obtains the first power distribution result, and judge whether described first power distribution result meets stable condition, if met, this first power distribution result is supplied to transmitter module; Otherwise, the power division performing the second dimension obtains the second power distribution result, and judge whether described second power distribution result meets stable condition, if met, this second power distribution result is supplied to described transmitter module, otherwise repeats the power division of described first dimension and the power division of described second dimension;
Described transmitter module, for according to described first power distribution result or described second power distribution result to described user terminal transmitting data.
In an embodiment of the invention, described first dimension is one of them dimension of communication cell dimension and frequency dimension, and described second dimension is another dimension in described communication cell dimension and described frequency dimension.
In an embodiment of the invention, described power control module is used for:
When carrying out the power division of frequency dimension, the collection division of combining carried out in m sub-bandwidth obtains one or more alternative collection of combining, and described alternative collection of combining comprises one or more communication cell, wherein the value of m is 1,, M, M are the wide number of subband in described communication network;
Calculate described alternative combine concentrated each communication cell strengthen the property and independent performance, the strengthening the property of described communication cell to combine the performance that concentrated other communication cells one or more are in this communication cell under off position for this is alternative, the independent performance of described communication cell is this alternative performance of combining all in running order this communication cell lower, concentrated all communication cells;
Strengthening the property of this communication cell is compared with the independent performance of this communication cell, power configuration is carried out according to described comparative result, if described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, make this effectively combine concentrated other communication cells one or more and give up this m sub-bandwidth, and make described other communication cell one or more determining that power becomes and can distribute power in this m sub-bandwidth; Otherwise, do not change this and alternatively combine concentrated each communication cell determine power in described m sub-bandwidth.
In an embodiment of the invention, described power control module is further used for: the independent performance of described communication cell is informed other base stations.
In an embodiment of the invention, described power control module is used for:
When carrying out the power division of communication cell dimension, for each communication cell of described communication network, the measurement report provided according to described user terminal can distribute power and configure to one or more subbands of this communication cell wide according to preset rules.
Particularly, embodiments provide a kind of communication system, comprising:
Base station, multiple communication cell, the measurement report that the user terminal covered for receiving self provides, reports middle control unit;
Described middle control unit, power division for carrying out the first dimension according to described measurement report obtains the first power distribution result, and judge whether described first power distribution result meets stable condition, if met, this first power distribution result is supplied to base station, described communication cell; Otherwise, the power division performing the second dimension obtains the second power distribution result, and judge whether described second power distribution result meets stable condition, if met, this second power distribution result is supplied to base station, described communication cell, otherwise repeats the power division of described first dimension and the power division of described second dimension;
Base station, described communication cell is further used for: according to described first power distribution result or described second power distribution result to described user terminal transmitting data.
In an embodiment of the invention, described first dimension is one of them dimension of communication cell dimension and frequency dimension, and described second dimension is another dimension in described communication cell dimension and described frequency dimension.
In an embodiment of the invention, described middle control unit is used for: when carrying out the power division of frequency dimension, the collection division of combining carried out in m sub-bandwidth obtains one or more alternative collection of combining, described alternative collection of combining comprises one or more communication cell, wherein the value of m is 1,, M, M are the wide number of subband in described communication network;
Calculate described alternative combine concentrated each communication cell strengthen the property and independent performance, the strengthening the property of described communication cell to combine the performance that concentrated other communication cells one or more are in this communication cell under off position for this is alternative, the independent performance of described communication cell is this alternative performance of combining all in running order this communication cell lower, concentrated all communication cells;
Strengthening the property of this communication cell is compared with the independent performance of this communication cell, power configuration is carried out according to described comparative result, if described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, make this effectively combine concentrated other communication cells one or more and give up this m sub-bandwidth, and make described other communication cell one or more determining that power becomes and can distribute power in this m sub-bandwidth; Otherwise, do not change this and alternatively combine concentrated each communication cell determine power in described m sub-bandwidth.
In an embodiment of the invention, described middle control unit is used for: when carrying out the power division of communication cell dimension, for each communication cell of described communication network, the measurement report provided according to described user terminal can distribute power and configure to one or more subbands of this communication cell wide according to preset rules.
Accompanying drawing explanation
Fig. 1 illustrates the differentiation that small-cell is disposed;
The method flow diagram that Fig. 2 (a) controls for power in one embodiment of the invention;
The method flow diagram that Fig. 2 (b) controls for power in one embodiment of the invention;
Fig. 3 is the method flow diagram that in one embodiment of the invention, power controls;
Fig. 4 is the method flow diagram that in one embodiment of the invention, power controls;
Fig. 5 is the schematic diagram of the medium and small subzone network of one embodiment of the invention;
Fig. 6 is the schematic diagram of two-dimentional power resource allocation in one embodiment of the invention;
Fig. 7 is the power division schematic diagram of small-cell dimension in one embodiment of the invention;
Fig. 8 is the power division schematic diagram of one embodiment of the invention medium frequency dimension;
Fig. 9 is the power division schematic diagram of small-cell dimension in one embodiment of the invention;
Figure 10 is the structural representation of the base station of carrying out power control in one embodiment of the invention;
Figure 11 is the structural representation of communication system in one embodiment of the invention;
Figure 12 is the structural representation of communication system in one embodiment of the invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in more detail.
In order to average out in interference and resource utilization etc., the embodiment of the present invention proposes the Poewr control method in a kind of communication network, to maintain the service efficiency of the communication resources such as power resource in the deployment of communication cell.It may be noted that this method that the embodiment of the present invention provides can be used for during dissimilar communication cell disposes, such as can be used for during small-cell disposes, or in deployment for macrocell, Microcell, picocell or Home eNodeB etc.
Fig. 2 (a) is the Poewr control method in the communication network shown in one embodiment of the invention, comprises the following steps.
In a step 101, carry out power division in the first dimension of described communication network, obtain the first power distribution result.
In a step 102, judge whether described first power distribution result meets stable condition, if met, described power controls to terminate, otherwise continues to perform step 103.
In step 103, carry out power division in the second dimension of described communication network, obtain the second power distribution result.
At step 104, judge whether described second power distribution result meets stable condition, if met, described power controls to terminate, otherwise returns execution step 101.
In a specific implementation, the method shown in Fig. 2 (a) can be applied to low power base station (can be described as low power nodes again), or is applied on the base stations, communication cell such as macro base station (MBS, Macro Base Station).
In a specific implementation, described first dimension is one of them dimension of communication cell dimension and frequency dimension, and described second dimension is another dimension in described communication cell dimension and described frequency dimension.Such as, when described first dimension is communication cell dimension, described second dimension is frequency dimension.And for example, when described first dimension is frequency dimension, described second dimension is communication cell dimension.In a specific implementation, communication cell dimension can be small-cell (SC) dimension.
The method flow diagram that Fig. 2 (b) controls for power in one embodiment of the invention.Particularly, the Poewr control method shown in Fig. 2 comprises the following steps.
In step 201, the power configuration of multiple communication cell on multiple subband wide (subband) is in initial condition.Such as, the power averaging on wide for multiple subband is distributed.In specific implementation, subband is wide can be again subchannel (subchannel).
In step 202., the power division in the first dimension of executive communication network, obtains the first power distribution result and preserves.
In step 203, judge whether described first power distribution result meets stable condition, if met, described power controls to terminate, otherwise continues to perform step 204.
In step 204, perform the power division in the second dimension of described communication network based on described first power distribution result, obtain the second power distribution result and preserve.
In step 205, judge whether described second power distribution result meets stable condition, if met, described power controls to terminate, otherwise returns execution step 202.
In a specific implementation, when described first dimension is frequency dimension, step 203 comprises: this first power distribution result and first power distribution result of last time are compared; If there is not giving up of new communication cell antithetical phrase bandwidth in this first power distribution result, then terminate described power and control, otherwise perform step 204.Wherein, the first power distribution result obtained when first power distribution result of last time is and performed step 202 in the past, is different from the first power distribution result (being also this first power distribution result) that current execution step 202 obtains.
In a specific implementation, when described first dimension is communication cell dimension, described step 203 comprises: the difference determining each subband this first power distribution result wide and first power distribution result of last time in described communication cell; Described difference and pre-determined threshold are compared, if be less than described pre-determined threshold, terminate described power and control, otherwise perform step 204.In a realization example, for all subbands are wide, in the dimension of communication cell, carry out power division all will obtain corresponding power distribution result at every turn, and when the comparative result between this power distribution result of twice, front and back is all less than described pre-determined threshold, power control process can terminate.
It may be noted that carry out the concrete operations of stable condition judgement according to the second power distribution result in step 205 can refer step 203, repeat no more herein.
In the flow process shown in Fig. 2 (a) or Fig. 2 (b), when described first dimension or the second dimension are frequency dimension, carry out power division in the frequency dimension of described communication network to comprise: the collection division of combining carried out in m sub-bandwidth obtains one or more alternative collection of combining, described alternative collection of combining comprises one or more communication cell, wherein the value of m is 1,, M, M are the wide number of subband in described communication network;
According to user terminal feedback measurement report calculate described alternative combine concentrated each communication cell strengthen the property and independent performance, the strengthening the property of described communication cell to combine the performance that concentrated other communication cells one or more are in this communication cell under off position for this is alternative, the independent performance of described communication cell is this alternative performance of combining all in running order this communication cell lower, concentrated all communication cells;
Judge whether strengthening the property of this communication cell is greater than the independent performance of this communication cell, carries out power configuration according to described judged result.Particularly, if described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, make this effectively combine concentrated other communication cells one or more and give up this m sub-bandwidth, and make described other communication cell one or more determining that power becomes and can distribute power in this m sub-bandwidth; Otherwise, do not change this and alternatively combine concentrated each communication cell determine power in described m sub-bandwidth.Wherein, determine that power can be determined by initial condition, or determined by the power division of last time or this communication cell dimension.It may be noted that, in the two-dimentional power resource allocation scheme that the embodiment of the present invention provides, the power division of frequency dimension is carried out based on the power distribution result of communication cell dimension, and the power division of communication cell dimension is carried out based on the power distribution result of frequency dimension, so circulate.
In a specific implementation, describedly judge that the independent performance whether being greater than this communication cell of strengthening the property of this communication cell comprises: obtain described alternative independent performance of combining other communication cell concentrated; The Performance Score of this communication cell is calculated with described alternative independent performance of combining concentrated all communication cells according to strengthening the property of this communication cell; Determine whether the Performance Score of this communication cell is greater than the independent performance of this communication cell.
In the flow process shown in Fig. 2 (a) or Fig. 2 (b), when described first dimension or the second dimension are communication cell dimension, carry out power division in the communication cell dimension of described communication network to comprise: for each communication cell of described communication network, power can be distributed according to the measurement report of user terminal feedback and configure to one or more subbands of this communication cell wide according to preset rules.
It may be noted that and adopt Fig. 2 (a) and/or the flow process shown in Fig. 2 (b), the method that the embodiment of the present invention provides obtains larger performance gain by less resource occupation.
Fig. 3 is the method flow diagram that in one embodiment of the invention, power controls.In figure 3, the first dimension is small-cell dimension, and the second dimension is frequency dimension.
Step 301 is similar with step 201.
In step 302, carry out the power division of small-cell dimension, obtain the power distribution result of small-cell dimension.
Particularly, the power division of small-cell dimension comprises: in each small-cell, rated power Pmax is distributed to multiple subband according to certain principle wide.Such as, for small-cell 1, the subchannel participating in power division is subchannel 1-4, and allocation result is: the power of subchannel 1 is P1, and the power of subchannel 2 is P2, and the power of subchannel 3 is P3, and the power of subchannel 4 is P4, P1+P2+P3+P4≤Pmax.
In a realization example, the power division of above-mentioned small-cell dimension can be obtained by successive ignition, and Water-filling such as can be adopted to carry out the power division of small-cell dimension.
In step 303, this small-cell dimension power distribution result and the small-cell dimension power distribution result of last time are compared, if comparative result is within pre-determined threshold, terminates described power and control, otherwise continue to perform step 304.
Such as, last time small-cell dimension power division be finished after, two sub-allocated bandwidth of small-cell A to power be respectively P1 and P2.After the power division of this small-cell dimension is run, these two sub-allocated bandwidth of small-cell A to power be respectively P3 and P4.If | P1-P3|< pre-determined threshold, and | P2-P4|< pre-determined threshold, then meet stable condition, and whole power control process terminates.
In step 304, carry out the power division of frequency dimension, obtain the power distribution result of frequency dimension.
Particularly, the power division of frequency dimension comprises: determine for each subband is wide multiplely alternatively to combine collection, each alternative collection of combining is the combination of a kind of small-cell.According to performance estimation from above-mentioned alternative combine to concentrate select one and combine collection, according to choose the setting of associating collection to carry out power configuration.In the following description, chosen collection of combining is called and effectively combines collection.
In a realization example, for step 304, collection division can be combined for wide the carrying out of each subband, obtain m the one or more alternative of sub-bandwidth and combine collection.Dividing about combining collection, can various ways be had.Such as, the method for traversal can be adopted, suppose there are 4 small-cells, just have
kind is alternative combines collection.And for example, by setting iterated conditional, possible collection of combining is screened, suppose there are 4 small-cells, poor-performing after wherein small-cell A and small-cell C being combined, then divide obtain one or more alternative and combine concentrated carrying out combining collection, exist when small-cell A is different with small-cell C, also namely the associating of small-cell A and small-cell C does not meet iterated conditional.
When determining effectively to combine collection, needing to calculate certain and alternatively combining strengthening the property of concentrated each small-cell, strengthening the property of described small-cell is compared with the independent performance of this small-cell, judges according to comparative result.If described in strengthen the property and be greater than described independent performance, be defined as effectively combining collection by this alternative collection of combining, power configuration is carried out in the setting of effectively combining collection according to this, makes one or more small-cell give up this m sub-bandwidth; Otherwise, do not change the fixed power division of step 302.
When calculating the strengthening the property of each small-cell, need to suppose that this is alternatively combined concentrated every other small-cell and do not work (muting), or suppose that this alternatively combines concentrated one or more other small-cells muting.Particularly, when calculating is strengthened the property, this small-cell base station can use the CQI (CQI, Channel Quality Indicator) carried in the measurement report of user terminal to send up.In a specific implementation, described user terminal directly can report the CQI of one or more other small-cells muting.In another specific implementation, this small-cell base station can calculate the CQI corresponding with the state of one or more other small-cells muting according to the CQI of described user terminal to send up.
In a specific implementation, small-cell is given up the wide operation of subband and can is: be 0 by the power setting of this small-cell on this subband is wide, or by the power setting of this small-cell on this subband is wide be greater than 0 lowest power value (Pmin).Wherein, the value of Pmin can be arranged according to actual needs.
In step 305, this frequency dimension power distribution result and the frequency dimension power distribution result of last time are compared, if the same terminate described power and control, otherwise return execution step 302.
Such as, after the power division of this frequency dimension is run, the result obtained for the wide m of subband is: effectively combining collection is { A, B, C}, and small-cell B and C gives up the wide m of subband.This grouping and subband be wide give up situation with last time frequency dimension operation result consistent, this frequency dimension does not occur that the wide situation of subband is given up in new small-cell in other words.Now, stable condition is met, and whole power control process terminates.
Method according to Fig. 3, it is wide that rated power is distributed to the good subband of channel quality by the power division of small-cell dimension more, makes more easily to form associating collection in frequency dimension.In frequency dimension, by small-cell associating with subband is wide gives up, reduce the interference between small-cell, power division is more restrained.
Fig. 4 is the method flow diagram that in one embodiment of the invention, power controls.In the diagram, the first dimension is frequency dimension, and the second dimension is small-cell dimension.
Step 401 is similar with step 201.
In step 402, carry out the power division of frequency dimension, obtain the power distribution result of frequency dimension.
In a specific implementation, step 402 comprises following operation: carry out combining collection division and obtain one or morely alternatively combining collection.Calculate and describedly alternatively combine strengthening the property of concentrated each small-cell, strengthening the property of described small-cell is compared with the independent performance of this small-cell.Carry out power division according to comparative result, if described in strengthen the property and be greater than described independent performance, then carry out power configuration according to this alternative setting of combining collection, make one or more small-cell give up this m sub-bandwidth; Otherwise, do not change fixed power division before this.
In step 403, this frequency dimension power distribution result and the frequency dimension power distribution result of last time are compared, if the same terminate described power and control, otherwise continue to perform step 404.
In step 404, carry out the power division of small-cell dimension, obtain the power distribution result of small-cell dimension.
Particularly, give up the wide small-cell of subband for occurring in the power configuration of step 404, wide for these subbands is determined that power division is wide to other subbands in this small-cell.Or, rated power is re-started power division in other subbands of this small-cell are wide.
In an embodiment of the invention, the power division of small-cell dimension also can adopt the method similar with frequency dimension.Particularly, the associating collection division carried out on the n-th communication cell obtains one or morely alternatively combining collection, describedly alternatively combines collection to comprise one or more subband wide, and wherein the value of n is 1 ..., N, N are the communication cell number in described communication network.According to user terminal feedback measurement report calculate described alternative combine concentrated each subband wide strengthen the property and independent performance, what described subband was wide strengthen the property for this is alternative combines that concentrated other subbands one or more are wide does not distribute power and by the wide performance taking rated power of this subband, and the wide independent performance of described subband is that this alternatively combines the wide performance of wide all in running order this subband lower of concentrated all subbands.Judge whether wide the strengthening the property of this subband is greater than the wide independent performance of this subband, carries out power configuration according to described judged result.If described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, this is effectively combined, and concentrated other subbands one or more are wide gives up this n-th communication cell, and make wide the determining that power becomes and can distribute power on this n-th communication cell of described other subband one or more; Otherwise, do not change this and alternatively combine that concentrated each subband is wide determines power on described n-th communication cell.
In step 405, front and back power ratio wide for subband each in this small-cell or front and back difference power and pre-determined threshold are compared, if be less than described pre-determined threshold, terminate described power and control, otherwise return and perform step 402.
Particularly, the front and back power ratio that each subband is wide or front and back difference power by last time small-cell dimension power division and the power division of this small-cell dimension determine.
In the embodiment shown in Fig. 2-4, for the power division of small-cell dimension, in a specific implementation, can distribute according to traditional Water-filling.In another specific implementation, also can set up utility function and distribute.Such as, formula (1) can be carried out the power division of small-cell dimension as utility function.
In formula (1), p
m(t+1) be the performance number of m sub-bandwidth at time point (t+1), γ
mt () is the Signal to Interference plus Noise Ratio (SINR) of m sub-bandwidth at time point t, W is the bandwidth of m sub-bandwidth, and a is default value, p
maxit is the maximum power value that m sub-bandwidth allows.For formula (1), the power for each sub-allocated bandwidth in each small-cell can be obtained according to traditional iterative manner.
In the embodiment shown in Fig. 2-4, for the power division of frequency dimension, on each subband is wide, collection is combined to all small-cells and divides.Combining concentrated one or more small-cells, to give up corresponding subband wide, thus reduce the interference of other small-cells in distich intersection.By combine collection divide after strengthen the property and to compare with the independent performance of small-cell.Particularly, corresponding utility function (payofffunction) can be set up and carry out performance estimation.
In a specific implementation, suppose there be small-cell A and B on subband wide 1.When not carrying out combining collection division, the independent performance of small-cell A is PerfA, and the independent performance of small-cell B is PerfB.Carry out combining after collection divides, it is wide by 1 that small-cell B gives up subband, now the strengthening the property as improved_PerfA of small-cell A.In one example, the Performance Score of small-cell A is x
1the Performance Score of=0.5* (improved_PerfA-PerfA-PerfB)+PerfA, small-cell B is x
2=0.5* (improved_PerfA-PerfA-PerfB)+PerfB.If the Performance Score of small-cell A is greater than PerfA, and the Performance Score of small-cell B is greater than PerfB, then adopt this to combine collection and divide.Otherwise, do not carry out combining collection and divide, allow small-cell A and small-cell B work alone.When carrying out performance estimation, need to use the measurement report that user terminal (UE) feeds back.Such as, when calculating improved_PerfA, need the CQI of all UE feedbacks used in the A of small-cell, this CQI obtains when hypothesis small-cell B does not work (muting).In addition, mutual feedback performance is needed between small-cell base station.Such as, its independent performance PerfB is informed small-cell A by small-cell B, and small-cell A calculates x accordingly
1.
In a concrete example, formula (2) can be adopted as utility function.
In formula (2), x
nbe the Performance Score of the n-th small-cell, N
mfor taking the small-cell set of the wide m of subband, C
mfor N
msubset
p
mfor combining C when collection divides
mpower allocation case, n} represent combine concentrate only have small-cell n,
for the independent performance of small-cell n,
for combining collection C
mgain.Such as, when small-cell A and B forms associating collection, C
m={ A, B}, then P
mthere are two kinds of situations: 1, small-cell B gives up the wide m of subband; 2, small-cell A gives up the wide m of subband.
It may be noted that the situation for there being multiple small-cell, the result of combining collection division has multiple.Such as, for the situation that there is small-cell A, small-cell B, small-cell C, associating integrate 1 as small-cell A and small-cell B and small-cell C work alone, associating integrate 2 as small-cell B and small-cell C and small-cell A work alone, associating integrates 3 as small-cell A-C, combine integrate 4 as small-cell A and small-cell C and small-cell B work alone.Now, can Performance Score calculating be carried out one by one and judge, repeat no more herein.
In another specific example, formula (3) can be adopted as utility function.
Wherein,
for associating gain.In equation (3), α
ncan flexible design.In one embodiment,
also namely all small-cell equality shares the effectiveness after game.In another embodiment,
now require at the α combining concentrated all small-cells
nsum equals 1, is also
α
s>=0,
it should be noted that, by requiring α
nsum equals 1, can be complete by utility allocation in all small-cells.
Fig. 5 is the schematic diagram of the medium and small subzone network of one embodiment of the invention, comprises multiple small-cells group.These small-cell groups overlap with the overlay area of 1 macrocell, but small-cell and macrocell are operated on different carrier frequency.Such as, macrocell is operated in F1, and all small-cells are operated in F2, and F2 is higher than F1.In specific implementation, the small-cell network shown in Fig. 5 can be distributed, also can be centralized.As shown in Figure 6, the spendable communication resource of this small-cell network is divided into two dimensions, and the first dimension is one of them in small-cell dimension and frequency dimension, and the second dimension is another in small-cell dimension and frequency dimension.
Fig. 7 is the power division schematic diagram of small-cell dimension in one embodiment of the invention.In this embodiment, supposing there are 4 small-cells in small-cell dimension, is small-cell A, small-cell B, small-cell C, small-cell D respectively.Having 5 sub-bandwidth in frequency dimension, is SB1, SB2, SB3, SB4, SB5 respectively, and the wide watt level of these subbands illustrates with relative mode in the figure 7.Such as, as can be seen from Figure 7, in the A of small-cell, the power that SB1 is assigned to is greater than SB4.
Based on the power distribution result of the small-cell dimension shown in Fig. 7, the wide upper needs of each subband carry out combining collection and judge, as shown in Figure 8.Fig. 8 is the power division schematic diagram of one embodiment of the invention medium frequency dimension.On SB1, small-cell A and small-cell B forms one and combines collection (being labeled as associating collection 1), and small-cell C and small-cell D forms one and combines collection (being labeled as associating collection 2).On SB5, small-cell B, C, D form one and combine collection (being labeled as associating collection 3).For SB2, SB3, SB4, between small-cell, associating collection can not be formed.Combining in collection 1, according to result of calculation, small-cell B gives up SB1.Combining in collection 2, small-cell D gives up SB1.Combining in collection 3, small-cell C, D give up SB5.In fig. 8, the small-cell oblique line giving up subband wide is filled.
Through the small-cell grouping shown in Fig. 8 with subband is wide gives up, small-cell B, C, D need again to carry out power division, as shown in Figure 9.Fig. 9 is the power division schematic diagram of small-cell dimension in one embodiment of the invention.For small-cell B, rated power distributes between these 4 sub-bandwidth of SB2-SB5.For small-cell C, rated power distributes between these 4 sub-bandwidth of SB1-SB4.For small-cell D, rated power distributes between these 3 sub-bandwidth of SB2, SB3, SB4.
Interactional as can be seen from the power division of Fig. 7-9, two dimensions.Such as, after the power division of small-cell dimension, the signal in small-cell, noise, SINR etc. can change, and input when making frequency dimension carry out power division changes, thus affects the power division of frequency dimension.
Figure 10 is the structural representation of the base station of carrying out power control in one embodiment of the invention.Base station shown in Figure 10 comprises: power control module 1001, transmitter module 1002.
In a realization example, the measurement report that power control module 1001 provides for the user terminal receiving this base station coverage, carry out the power division of the first dimension, judge whether the power division of described first dimension meets stable condition, if met, this power distribution result is supplied to transmitter module, otherwise carry out the power division of the second dimension, and judge whether the power division of described second dimension meets stable condition further, if met, this power distribution result is supplied to described transmitter module, otherwise repeat the power division of described first dimension and the power division of described second dimension.
In a realization example, described transmitter module 1002 for according to the power distribution result of described first dimension or the second dimension to described user terminal transmitting data.
In one embodiment of the invention, described power control module 1001 comprises: the first dimension power modules 1011, second dimension power modules 1021.Wherein, the first dimension power modules 1011 carries out power division for the power distribution result according to initial condition and/or the second dimension in the first dimension of communication network.Second dimension power modules 1021 carries out power division for the power distribution result according to described initial condition and/or the first dimension in the second dimension of described communication network.
Particularly, when described first dimension is frequency dimension, described first dimension power modules 1011 for: be that m sub-bandwidth is carried out combining collection division and obtained one or more alternative collection of combining; Calculate and describedly alternatively combine strengthening the property of concentrated each small-cell, strengthening the property of described small-cell is compared with the independent performance of this small-cell; Carry out power division according to comparative result, if described in strengthen the property and be greater than described independent performance, then according to choose the setting of associating collection to carry out power configuration, make one or more small-cell give up this m sub-bandwidth; Otherwise, do not change fixed power division before this.
Particularly, when described second dimension is frequency dimension, described second dimension power modules 1021 is for performing the operation described in step 303.
Further, described power control module 1001 for: the independent performance of own base stations is informed other base stations.
It may be noted that the concrete operations of base station shown in Figure 10 with reference to figure 2-9, can repeat no more herein.In specific implementation, this base station can be the remote radio part (RRH of small-cell base station, micro-base station (Micro eNB), femto base station (pico eNB), femto base station (femto eNB), base station, RemoteRadio Head), the low power base station such as relaying (Relay), or the normal base station such as macro base station.
Figure 11 is the structural representation of communication system in one embodiment of the invention, and this communication system comprises multiple small-cell base station, employing be distributed network.For the purpose of illustrating, small-cell base station 1 shown in Figure 11 and small-cell base station 2, can dispose more small-cell base station in actual environment.The composition structure of each small-cell base station with reference to the base station in figure 9, can repeat no more herein.For each small-cell base station, it administers one or more user terminal (UE), in Figure 11 with 2 UE exemplarily.In a specific implementation, UE is provided with: measurement report provides module, for report to its small-cell base station each subband wide on the information such as interference.
After certain small-cell base station receives the measurement report of one or more UE in its compass of competency, carry out the power division of small-cell dimension.Now, each small-cell base station can independently carry out multiple subband wide on power division, without the need to carrying out Signalling exchange for above-mentioned power division between multiple small-cell base station.
When carrying out the power division of frequency dimension, certain small-cell base station needs with other small-cell base stations mutual.Particularly, often kind of alternative collection of combining (is also C by this small-cell base station
m), and the Performance Score x that this alternative associating set pair is answered
1..., x
nbe supplied to other small-cell base stations.The collection of combining that this small-cell base station also can receive other small-cell base stations to be provided divides and Performance Score.
Figure 12 is the structural representation of communication system in one embodiment of the invention, and what this communication system adopted is centralized network, is provided with middle control unit (CU) 1201.Middle control unit 1201 manages a small-cell base station shown in multiple small-cell base station 1202, Figure 12 exemplarily, can dispose multiple small-cell base station in actual environment.Each small-cell base station administers a UE shown in one or more user terminal (UE) 1203, Figure 12 exemplarily.
Middle control unit 1201 comprises: power control module 1211 and power division module 1221.Particularly, power control module 1211 comprises: the first dimension power modules and the second dimension power modules.The first dimension power modules 1011 in operation and Figure 10 that described first dimension power modules performs is similar, and the second dimension power modules 1021 in the operation of described second dimension power modules execution and Figure 10 is similar, repeats no more herein.
Power division module 1221 is for being supplied to small-cell base station by final power distribution result, and this final power distribution result comprises the power that each small-cell base station is assigned on each subband is wide.
Small-cell base station 1202 comprises: measurement report forwarding module 1212 and transmitter module 1222.Wherein, measurement report forwarding module 1212 is transmitted to middle control unit 1201 for the measurement report that the UE self administered provides.The final power distribution result of transmitter module 1222 for providing according to power division module 1221, to described user terminal transmitting data.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (19)
1. the Poewr control method in communication network, is characterized in that, comprising:
A, carry out power division in the first dimension of described communication network, obtain the first power distribution result;
B, judge whether described first power distribution result meets stable condition, if met, described power controls to terminate, otherwise performs step C;
C, carry out power division in the second dimension of described communication network, obtain the second power distribution result;
D, judge whether described second power distribution result meets stable condition, if met, described power controls to terminate, otherwise performs steps A.
2. method according to claim 1, is characterized in that, described first dimension is one of them dimension of communication cell dimension and frequency dimension, and described second dimension is another dimension in described communication cell dimension and described frequency dimension.
3. method according to claim 1, is characterized in that, when described first dimension or the second dimension are frequency dimension, carry out power division comprise in the frequency dimension of described communication network:
The collection division of combining carried out in m sub-bandwidth obtains one or more alternative collection of combining, and described alternative collection of combining comprises one or more communication cell, and wherein the value of m is 1 ..., M, M are the wide number of subband in described communication network;
According to user terminal feedback measurement report calculate described alternative combine concentrated each communication cell strengthen the property and independent performance, the strengthening the property of described communication cell to combine the performance that concentrated other communication cells one or more are in this communication cell under off position for this is alternative, the independent performance of described communication cell is this alternative performance of combining all in running order this communication cell lower, concentrated all communication cells;
Judge whether strengthening the property of this communication cell is greater than the independent performance of this communication cell, carries out power configuration according to described judged result;
If described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, make this effectively combine concentrated other communication cells one or more and give up this m sub-bandwidth, and make described other communication cell one or more determining that power becomes and can distribute power in this m sub-bandwidth; Otherwise, do not change this and alternatively combine concentrated each communication cell determine power in described m sub-bandwidth.
4. method according to claim 3, is characterized in that, describedly judges that the independent performance whether being greater than this communication cell of strengthening the property of this communication cell comprises:
Obtain described alternative independent performance of combining other communication cell concentrated;
The Performance Score of this communication cell is calculated with described alternative independent performance of combining concentrated all communication cells according to strengthening the property of this communication cell;
Determine whether the Performance Score of this communication cell is greater than the independent performance of this communication cell.
5. the method according to any one of claim 1-4, is characterized in that, described step B comprises:
When described first dimension is frequency dimension, this first power distribution result and first power distribution result of last time are compared;
If there is not giving up of new communication cell antithetical phrase bandwidth in this first power distribution result, then terminate described power and control, otherwise perform step C.
6. the method according to any one of claim 1-4, is characterized in that, described step D comprises:
When described second dimension is frequency dimension, this second power distribution result and second power distribution result of last time are compared;
If there is not giving up of new communication cell antithetical phrase bandwidth in this second power distribution result, then terminate described power and control, otherwise perform steps A.
7. method according to claim 1, is characterized in that, when described first dimension or the second dimension are communication cell dimension, carry out power division comprise in the communication cell dimension of described communication network:
The associating collection division carried out on the n-th communication cell obtains one or morely alternatively combining collection, describedly alternatively combines collection to comprise one or more subband wide, and wherein the value of n is 1 ..., N, N are the communication cell number in described communication network;
According to user terminal feedback measurement report calculate described alternative combine concentrated each subband wide strengthen the property and independent performance, what described subband was wide strengthen the property for this is alternative combines that concentrated other subbands one or more are wide does not distribute power and by the wide performance taking rated power of this subband, and the wide independent performance of described subband is that this alternatively combines the wide performance of wide all in running order this subband lower of concentrated all subbands;
Judge whether wide the strengthening the property of this subband is greater than the wide independent performance of this subband, carries out power configuration according to described judged result;
If described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, this is effectively combined, and concentrated other subbands one or more are wide gives up this n-th communication cell, and make wide the determining that power becomes and can distribute power on this n-th communication cell of described other subband one or more; Otherwise, do not change this and alternatively combine that concentrated each subband is wide determines power on described n-th communication cell.
8. method according to claim 1, is characterized in that, when described first dimension or the second dimension are communication cell dimension, carry out power division comprise in the communication cell dimension of described communication network:
For each communication cell of described communication network, power can be distributed according to the measurement report of user terminal feedback and configure to one or more subbands of this communication cell wide according to preset rules.
9. according to claim 1, the method described in 2,7 or 8, is characterized in that, described step B comprises:
When described first dimension is communication cell dimension, this first power distribution result wide for subband each in described communication cell and first power distribution result of last time are compared;
Comparative result and pre-determined threshold are compared, if be less than described pre-determined threshold, terminate described power and control, otherwise perform step C.
10. according to claim 1, the method described in 2,7 or 8, is characterized in that, described step D comprises:
When described second dimension is communication cell dimension, this second power distribution result wide for subband each in described communication cell and second power distribution result of last time are compared;
Comparative result and pre-determined threshold are compared, if be less than described pre-determined threshold, terminate described power and control, otherwise perform steps A.
11. 1 kinds of base stations, comprising:
Power control module, for the measurement report that the user terminal receiving this base station coverage provides, the power division of carrying out the first dimension obtains the first power distribution result, and judge whether described first power distribution result meets stable condition, if met, this first power distribution result is supplied to transmitter module; Otherwise, the power division performing the second dimension obtains the second power distribution result, and judge whether described second power distribution result meets stable condition, if met, this second power distribution result is supplied to described transmitter module, otherwise repeats the power division of described first dimension and the power division of described second dimension;
Described transmitter module, for according to described first power distribution result or described second power distribution result to described user terminal transmitting data.
12. base stations according to claim 11, is characterized in that, described first dimension is one of them dimension of communication cell dimension and frequency dimension, and described second dimension is another dimension in described communication cell dimension and described frequency dimension.
13. base stations according to claim 11, is characterized in that, described power control module is used for:
When carrying out the power division of frequency dimension, the collection division of combining carried out in m sub-bandwidth obtains one or more alternative collection of combining, and described alternative collection of combining comprises one or more communication cell, wherein the value of m is 1,, M, M are the wide number of subband in described communication network;
Calculate described alternative combine concentrated each communication cell strengthen the property and independent performance, the strengthening the property of described communication cell to combine the performance that concentrated other communication cells one or more are in this communication cell under off position for this is alternative, the independent performance of described communication cell is this alternative performance of combining all in running order this communication cell lower, concentrated all communication cells;
Strengthening the property of this communication cell is compared with the independent performance of this communication cell, power configuration is carried out according to described comparative result, if described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, make this effectively combine concentrated other communication cells one or more and give up this m sub-bandwidth, and make described other communication cell one or more determining that power becomes and can distribute power in this m sub-bandwidth; Otherwise, do not change this and alternatively combine concentrated each communication cell determine power in described m sub-bandwidth.
14. base stations according to claim 13, is characterized in that, described power control module is further used for: the independent performance of described communication cell is informed other base stations.
15. base stations according to claim 11, is characterized in that, described power control module is used for:
When carrying out the power division of communication cell dimension, for each communication cell of described communication network, the measurement report provided according to described user terminal can distribute power and configure to one or more subbands of this communication cell wide according to preset rules.
16. 1 kinds of communication systems, comprising:
Base station, multiple communication cell, the measurement report that the user terminal covered for receiving self provides, reports middle control unit;
Described middle control unit, power division for carrying out the first dimension according to described measurement report obtains the first power distribution result, and judge whether described first power distribution result meets stable condition, if met, this first power distribution result is supplied to base station, described communication cell; Otherwise, the power division performing the second dimension obtains the second power distribution result, and judge whether described second power distribution result meets stable condition, if met, this second power distribution result is supplied to base station, described communication cell, otherwise repeats the power division of described first dimension and the power division of described second dimension;
Base station, described communication cell is further used for: according to described first power distribution result or described second power distribution result to described user terminal transmitting data.
17. communication systems according to claim 16, is characterized in that, described first dimension is one of them dimension of communication cell dimension and frequency dimension, and described second dimension is another dimension in described communication cell dimension and described frequency dimension.
18. communication systems according to claim 16, it is characterized in that, described middle control unit is used for: when carrying out the power division of frequency dimension, the collection division of combining carried out in m sub-bandwidth obtains one or more alternative collection of combining, described alternative collection of combining comprises one or more communication cell, and wherein the value of m is 1 ... M, M are the wide number of subband in described communication network;
Calculate described alternative combine concentrated each communication cell strengthen the property and independent performance, the strengthening the property of described communication cell to combine the performance that concentrated other communication cells one or more are in this communication cell under off position for this is alternative, the independent performance of described communication cell is this alternative performance of combining all in running order this communication cell lower, concentrated all communication cells;
Strengthening the property of this communication cell is compared with the independent performance of this communication cell, power configuration is carried out according to described comparative result, if described in strengthen the property and be greater than described independent performance, then described alternative collection of combining is defined as effectively combining collection, power configuration is carried out according to described setting of effectively combining collection, make this effectively combine concentrated other communication cells one or more and give up this m sub-bandwidth, and make described other communication cell one or more determining that power becomes and can distribute power in this m sub-bandwidth; Otherwise, do not change this and alternatively combine concentrated each communication cell determine power in described m sub-bandwidth.
19. communication systems according to claim 16, it is characterized in that, described middle control unit is used for: when carrying out the power division of communication cell dimension, for each communication cell of described communication network, the measurement report provided according to described user terminal can distribute power and configure to one or more subbands of this communication cell wide according to preset rules.
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