CN102131246A - Method and device for coordinating dynamic interference of cell inside base station - Google Patents
Method and device for coordinating dynamic interference of cell inside base station Download PDFInfo
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Abstract
The invention discloses a method and a device for coordinating dynamic interference of each cell inside a base station. The method comprises the following steps of: acquiring interference coordination information inside the base station, and obtaining first scheduling policies of the cells inside the base station by utilizing the interference coordination information inside the base station; informing schedulers corresponding to the cells inside the base station of the first scheduling policies of the cells inside the base station; and scheduling by the scheduler of each cell inside the base station according to the corresponding first scheduling policy. By adopting the scheme disclosed by the invention, the interference among the cells of a long term evolution (LTE) system can be reduced better. Compared with the traditional interference reducing scheme, the scheme has the characteristics of accuracy and flexibility and can be used for further improving frequency spectrum efficiency of the system and resource utilization ratio.
Description
Technical field
The present invention relates to communication technical field, be meant a kind of method and device that carries out each district dynamic interference coordination of inside of base station especially.
Background technology
At Long Term Evolution (Long Term Evolution, LTE) in the system, by adopting OFDM (Orthogonal Frequency Division Multiplexing at down link, OFDM) transmission technology, adopt SC-FDMA (Single Carrier-Frequency Division MultipleAccess in up link, single-carrier frequency division multiple access) technology has preferably resolved the problem of disturbing in the sub-district.Therefore for the LTE system, the interference that each sub-district is subjected to is mainly from two parts: thermal noise and presence of intercell interference in the sub-district (ICI, Inter-Cell Interference).Traditional communication technology and signal processing technology (as, matched filtering) can eliminate the harmful effect that thermal noise brings preferably.For presence of intercell interference, common cell mobile communication systems is the purpose that realizes alleviating presence of intercell interference by the method for channeling (being the resource that neighbor cell uses different frequency range), has still so directly caused the not high shortcoming of system frequency resource utilance.
In the LTE system, in order to realize identical networking as much as possible, semi-static Inter-Cell Interference Coordination (Inter-Cell Interference Coordination is adopted in the decision of LTE standard, ICIC) technology, and defined the ICIC technology required at the mutual related resource restriction strategy of X2 interface (or being called load information), as HII (High Interference Indicator, the high interference indication), OI (Overload Indicator, the overload indication), RNTP (Relative-narrowband Tx Power indicator, Relative Narrowband TX Power indication) etc.The ICIC technology is made the decision-making that the restriction resource is used by the load information of this sub-district generation and the neighbor cell load information that receives, and this decision-making is informed that modules such as scheduling, power control are to reach the purpose of Inter-Cell Interference Coordination.
After modules such as scheduler, power control have received that the ICIC module is made resource use restriction decision-making, be to follow this restriction when each dispatched users is distributed frequency domain resource, power resource in this sub-district, thus the interference mitigation that coordinate mutually the realization minizone.
In the scene of reality, more than one of the number of cells of a common support in base station, as, three sector systems, the LTE standard code, an eNodeB supports 256 sub-districts at the most simultaneously, under such scene, since the base station can know simultaneously each sub-district specific to the each scheduled resources assignment information and the various relevant informations of respectively dispatching UE, therefore, the interaction time delay of X2 interface and capacity limit no longer are the limiting factors of restriction inter-cell interference mitigation scheme, and more optimal interference mitigation scheme can realize.
The LTE system reduces in the method for presence of intercell interference at present, does not still have the open scheme of implementing inter-cell interference mitigation by the characteristics of utilizing information interaction between the interior a plurality of sub-districts of same centralized management entity (as eNodeB).
In the LTE system, because there is not central controlled network entity in the Access Network side, therefore said method depends on related load information mutual of X2 interface (interface between the base station), consider that the X2 interface capacity is limited and have certain interaction time delay, therefore this method mutual information between each sub-district is very limited, and has the long update cycle.The ICIC related load information of LTE standard definition and minimum update cycle thereof are as follows: HII (20ms), OI (20ms), RNTP (200ms); As seen, the cycle that more than relies on the load information interaction that X2 interface carries out is far longer than the scheduling interval (the LTE system call is spaced apart 1ms) of system.
And in the scene of reality, owing to reasons such as moving at random of user, each user's channel circumstance is acute variation normally; In addition, the traffic load of each sub-district also is dynamic change, and specific to each time scheduling, the difference between each time of same sub-district scheduling also is very big.
Therefore, because the restriction of interface time delay and interface capacity, above-mentionedly depend on the efficient utilization that ICIC technology that X2 interface carries out load information interaction can not guarantee resource fully, can not reach the purpose that reduces presence of intercell interference by the fully mutual utilizable various information of inter-cell interference mitigation.So, based on the method for above-mentioned ICIC, can not well guarantee the efficient utilization of resource, have that system spectral efficiency is not high, the unfavorable shortcoming of throughput of system performance.
Summary of the invention
The invention provides the method and the device of each district dynamic interference coordination of a kind of inside of base station, can carry out interference coordination more accurately, flexibly and handle, and can further improve the spectrum efficiency and the resource utilization of system.
A kind of method of carrying out each district dynamic interference coordination of inside of base station that the embodiment of the invention provides comprises:
Obtain this inside of base station interference coordination information, utilize first scheduling strategy of described this inside of base station of inside of base station interference coordination information acquisition sub-district;
First scheduling strategy of described inside of base station sub-district is notified the scheduler of this inside of base station respective cell;
The scheduler of each sub-district of this inside of base station is dispatched according to first scheduling strategy of correspondence.
The device of a kind of district dynamic interference coordination that the embodiment of the invention provides comprises:
First information acquiring unit is used to obtain this inside of base station interference coordination information;
The scheduling strategy generation unit utilizes first scheduling strategy of described each sub-district of this inside of base station of inside of base station interference coordination information acquisition;
The scheduling strategy notification unit is used for the scheduler with described first scheduling strategy notice respective cell;
Scheduler is used for dispatching according to first scheduling strategy of receiving.
In the embodiment of the invention, by first scheduling strategy of each sub-district of this inside of base station of this inside of base station interference coordination information acquisition of obtaining; Notify the scheduler of respective cell to dispatch use first scheduling strategy of described each sub-district of inside of base station then.The embodiment of the invention takes into full account centralized management entity internal information and obtains characteristics with information interaction when carrying out interference mitigation between each sub-district, design more efficiently, interference mitigation scheme flexibly.By interference mitigation scheme provided by the invention, can better reduce the interference between the LTE system cell; Compare with common interference mitigation scheme (as, semi-static ICIC), this scheme has more accurately, flexible characteristic, can further improve the spectrum efficiency and the resource utilization of system.
Description of drawings
Fig. 1 carries out the schematic flow sheet of the method for each district dynamic interference coordination of inside of base station for the embodiment of the invention;
Fig. 2 carries out the structural representation of the device of each district dynamic interference coordination of inside of base station for the embodiment of the invention;
Fig. 3 is a specific embodiment of apparatus of the present invention.
Embodiment
Referring to shown in Figure 1, the method for the embodiment of the invention may further comprise the steps:
Step 101: obtain this inside of base station interference coordination information.
Described inside of base station interference coordination information can comprise: the load information or the resource use restriction strategy of other base stations informed in this base station, and each district dynamic interfere information of this inside of base station.
Step 102: first scheduling strategy that utilizes described each sub-district of this inside of base station of inside of base station interference coordination information acquisition.
When containing each district dynamic interfere information of this inside of base station in described the inside of base station interference coordination information, then can obtain each district dynamic interference coordination information of this inside of base station, comprise according to following steps:
Determine that the user for the presence of intercell interference sensitivity gathers in each sub-district of inside of base station;
Estimate that each sub-district of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand in the certain hour section;
Determine the interference level information on each PRB, and compare with predefined threshold value; According to the PRB user demand of each sub-district of determining for the terminal of presence of intercell interference sensitivity, and the interference level that obtains obtains district dynamic interfere information in the inside of base station above the PRB information of predefined threshold value.
User for the presence of intercell interference sensitivity in each sub-district of inside of base station can determine according to one or more information:
Each user's Geometry distributed intelligence and the information that enters/leave certain cell edge that obtains based on the A3 incident of LTE standard definition in each user's information on path loss, the sub-district in the sub-district.
Each user's information on path loss is determined in each sub-district of inside of base station the user for the presence of intercell interference sensitivity in according to the sub-district, can specifically realize like this: relatively the information on path loss of the terminal obtained and predefined threshold T HPL, if the path loss of UE is greater than default threshold T HPL, then this terminal is in cell edge, expression belongs to the user of inside of base station presence of intercell interference sensitivity, wherein, the power space according to this terminal reports the PHR information acquisition during information on path loss of described terminal.
Each user's information on path loss is determined in each sub-district of inside of base station the user for the presence of intercell interference sensitivity in according to the sub-district, can specifically realize like this: in a time period, obtain the PHR reporting information of each terminal in the sub-district, and go out the information on path loss of terminal based on the PHR information calculations; If the path loss of terminal is greater than the path loss values of setting, then this terminal is in cell edge.
Estimate that each sub-district of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand in the certain hour section, can realize like this: obtain in each subframe in time period T, all disturb the resource number Nused that sensitive users is on average used in the sub-district; Statistics is the total actual transfer rate SBR of all interference sensitive users of each sub-district in time period T; The formula of estimating resource demand is:
R wherein
kBe GBR speed, PBR speed or the minimum bit rate of business, all edge customer one total n business.
In implementation procedure, the cycle of obtaining this inside of base station interference coordination information can be less than the cycle of obtaining the resource use restriction strategy information between this base station and the mutual base station.
Step 103: the scheduler of first scheduling strategy of described inside of base station being notified respective cell.
Step 104: the scheduler of each sub-district of this inside of base station is dispatched according to first scheduling strategy of correspondence.
In embodiments of the present invention, can further utilize the resource between described inside of base station interference coordination information, this base station that obtains and the mutual base station to use restriction strategy information, obtain second scheduling strategy; Second scheduling strategy is notified the scheduler of this inside of base station respective cell; Then the scheduler of each sub-district of this inside of base station is unified scheduling according to first scheduling strategy and second scheduling strategy of correspondence.
Resource between described this base station and the mutual base station uses restriction strategy information to comprise by X2 interface load transmitted information.
In embodiments of the present invention, can also utilize first scheduling strategy and second scheduling strategy to generate the 3rd scheduling strategy of each sub-district correspondence; Then first scheduling strategy of described inside of base station sub-district is notified the scheduler of this inside of base station respective cell, and notified the scheduler of this inside of base station respective cell to realize like this second scheduling strategy: the scheduler that the 3rd scheduling strategy of each sub-district correspondence is sent to respective cell; Then the scheduler of each sub-district of this inside of base station carries out resource allocation according to the 3rd scheduling strategy of correspondence to the resource unification of this sub-district.
Here, the scheduler of each sub-district of this inside of base station can use the dynamic disturbance information of restricted information and each sub-district of inside of base station to dispatch according to resource between the channel quality information of dispatch terminal, mutual base station.
In the embodiment of the invention, this method may further include: according to the scheduling strategy of each sub-district of this inside of base station, determine that this base station requires the resource of mutual base station to use restriction strategy information, and this base station that will determine requires the resource of mutual base station to use restriction strategy information to be notified to each mutual base station.
Referring to shown in Figure 2, the device of a kind of district dynamic interference coordination of the embodiment of the invention comprises:
First information acquiring unit 21 is used to obtain this inside of base station interference coordination information;
Scheduling strategy generation unit 23 utilizes first scheduling strategy of described each sub-district of this inside of base station of inside of base station interference coordination information acquisition;
Scheduling strategy notification unit 24 is used for the scheduler with described first scheduling strategy notice respective cell;
Scheduler 25 is used for dispatching according to first scheduling strategy of receiving.
This device may further include: second information acquisition unit 22, and the resource that is used to obtain between this base station and the mutual base station is used restriction strategy information;
Then the scheduling strategy generation unit 23, are further used for utilizing the resource between described inside of base station interference coordination information, this base station that obtains and the mutual base station to use restriction strategy information, obtain second scheduling strategy;
Described scheduling strategy notification unit 24 is further used for second scheduling strategy is notified the scheduler of this inside of base station respective cell;
Described scheduler 25 is used for dispatching according to first scheduling strategy of receiving and second.
Described inside of base station interference coordination information comprises:
The load information or the resource use restriction strategy of other base stations informed in this base station, and each district dynamic interfere information of this inside of base station.
When containing each district dynamic interfere information of this inside of base station in described the inside of base station interference coordination information, described first information acquiring unit 21 is used for determining the user set of each sub-district of inside of base station for the presence of intercell interference sensitivity; Estimate that each sub-district of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand in the certain hour section; Determine the interference level information on each PRB, and compare with predefined threshold value, according to of the PRB user demand of each sub-district of determining for the terminal of presence of intercell interference sensitivity, and the interference level that obtains obtains district dynamic interfere information in the inside of base station above the PRB information of predefined threshold value.
Described first information acquiring unit 21 is used for determining the user of each sub-district of inside of base station for the presence of intercell interference sensitivity according to one or more information:
Each user's Geometry distributed intelligence and the information that enters/leave certain cell edge that obtains based on the A3 incident of LTE standard definition in each user's information on path loss, the sub-district in the sub-district.
Described first information acquiring unit 21, be used for the information on path loss of the terminal that will obtain and predefined threshold T HPL relatively, if the path loss of UE is greater than default threshold T HPL, then this terminal is in cell edge, expression belongs to the user of inside of base station presence of intercell interference sensitivity, wherein, the power space according to this terminal reports the PHR information acquisition during information on path loss of described terminal.
Described first information acquiring unit 21 is used for obtaining the PHR reporting information of each terminal in the sub-district in a time period, and goes out the information on path loss of terminal based on the PHR information calculations; If the path loss of terminal is greater than the path loss values of setting, then this terminal is in cell edge.
Described first information acquiring unit 21, be used for estimating according to following steps the Physical Resource Block PRB user demand of each community user of inside of base station in the certain hour section: obtain each subframe in time period T, all disturb the resource number Nused that sensitive users is on average used in the sub-district; Statistics is the total actual transfer rate SBR of all interference sensitive users of each sub-district in time period T; The formula of estimating resource demand is:
R wherein
kBe GBR speed, PBR speed or the minimum bit rate of business, all edge customer one total n business.
Described scheduling strategy generation unit 23 is further used for utilizing first scheduling strategy and second scheduling strategy to generate the 3rd scheduling strategy of each sub-district correspondence;
Then described scheduling strategy notification unit 24 is used for sending the scheduler that this inside of base station respective cell is notified first scheduling strategy and second scheduling strategy in the realization of the 3rd scheduling strategy by the scheduler to this inside of base station respective cell;
Described scheduler 25 is used for according to the 3rd scheduling strategy of correspondence resource allocation being carried out in the resource unification of this sub-district.
Described scheduling strategy notification unit 24 is used for respectively first scheduling strategy and second scheduling strategy are notified to the scheduler of each sub-district and the announcement period of announcement period sub-district second scheduling strategy of first scheduling strategy.
This device can further include:
The 3rd information acquisition unit is used for the scheduling strategy according to each sub-district of this inside of base station, determines that this base station requires the resource of mutual base station to use restriction strategy information;
Described scheduling strategy notification unit, this base station that is further used for determining require the resource of mutual base station to use restriction strategy information to be notified to each mutual base station.
Below lift specific embodiment and describe technical scheme of the present invention in detail.
The embodiment of the invention is the characteristics between the sub-district by abundant knot with when having the centralized management entity, have provided a kind of interference mitigation scheme of optimization, are example with the centralized management node eNodeB that exists in the LTE system.
In order to reach the purpose of minizone dynamic interference coordination, the device of the embodiment of the invention mainly comprises: above eNodeB internal interference harmony messages generation/update module, a resource are used restriction strategy transmitting-receiving administrative unit.
Wherein, eNodeB internal interference harmony messages generation/update module comprises three basic processing unit: the acquiring unit of each district dynamic interfere information of inside of base station, mutual resource is used the generation unit of restriction strategy between the base station, information notification unit (comprising that resource is used informing of restricted information between inside of base station dynamic disturbance information, eNodeB).
Here eNodeB internal interference harmony messages comprises the two large divisions: 1) inform load information or resource use restriction strategy to this eNodeB of other eNodeB, as HII, OI, RNTP etc.; 2) the dynamic interference coordination information between inner each sub-district of this eNodeB.Wherein, 2) information interaction periodicity is less than 1), 2) can adopt and eNodeB between mutual identical load information type as interference coordination information, also can design abundant more, accurate more information type and be used for the inside of base station dynamic interference coordination.
The interference coordination information of using between each sub-district of inside of base station can produce/upgrade according to following thinking: pre-estimate each sub-district in the eNodeB to the user of the ICI sensitivity user demand for PRB, in conjunction with the interference level on each PRB, determine the interference coordination information state parameter on each PRB of each sub-district.
The method that the district dynamic interfere information obtains in the inside of base station is as follows:
(1) determines that the user for the presence of intercell interference sensitivity gathers in each sub-district of inside of base station;
(2) estimate that each sub-district of inside of base station belongs to the demand of the UE of interference sensitive users set for the PRB resource in a period of time T;
(3) according to measurement on each PRB or Interference Estimation information, determine the interference level on each PRB, and the PRB that interference level surpasses predefined threshold T H is carried out mark;
(4) according to the number of each sub-district of determining in (2) for the required PRB of user of presence of intercell interference sensitivity, and the interference level that obtains in (3) generates district dynamic interfere information in the inside of base station above the PRB information of predefined threshold value.
In step (1), the user's set for the presence of intercell interference sensitivity in each sub-district of inside of base station can be determined according to following thinking:
(a) Cell Edge User is higher for the sensitivity of presence of intercell interference usually, and Cell Center User is subjected to the presence of intercell interference effect lower basically, therefore Cell Edge User can be included into the user's set for the presence of intercell interference sensitivity.
(b) determination methods of Cell Edge User can be based on one or more of following information: each user's Geometry distributed intelligence in each user's information on path loss, the sub-district in the sub-district, the information that enters/leave certain cell edge that obtains based on the A3 incident of LTE standard definition, or the like;
For (b), it is as follows to judge based on information on path loss whether the user is in the method for cell edge:
(b1) obtain PHR (the Power Headroom Report of UE, power space reports) reporting information, in fact comprise the content of three parts in PHR information: the information on path loss of UE, base station are at RRC (Radio Resource Control) the layer configuration of the scheduling that reports as time PHR and resource allocation information (as giving what PRB of this UE), the base station information to UE;
(b2) for the base station, the base station is at the scheduling and the resource allocation information that report as time PHR, and the configuration of the RRC of base station (Radio Resource Control) layer to give the information of UE all be known, therefore, according to the PHR information that UE reports, the base station can solve the information on path loss of UE;
(b3) after the information on path loss that obtains UE, can judge that this UE is in center of housing estate or is in cell edge by following two kinds of methods:
Method one: will report the information on path loss obtained and predefined threshold T HPL relatively according to the PHR of UE, if the path loss of UE is greater than default threshold T HPL, then this UE is in cell edge; Otherwise this UE is positioned at center of housing estate.
Method two: in a period of time T, obtain the PHR reporting information of each UE in the sub-district, and go out the information on path loss of UE based on the PHR information calculations; Information on path loss with all UE forms CDF (Cumulative Distribution Function then, the cumulative distribution function) curve, (the bent value of x is between 1～99 at the x% of curve, typical case's value is 30 or 10) locate to search corresponding path loss values, count PLref, if the path loss of UE is greater than PLref, then this UE is in cell edge; Otherwise this UE is positioned at center of housing estate.
In step (2), it is as follows for the method for the demand of PRB resource to estimate that interior each sub-district of inside of base station of a period of time T belongs to the UE that disturbs sensitive users to gather:
Determine the timing statistics length T, obtain in each subframe in statistics duration T that all disturb the resource number Nused that sensitive users is on average used in the sub-district;
All disturb the total actual transfer rate SBR of sensitive users to statistics in time period T cabinet sub-district;
The formula of estimating resource demand is:
R wherein
kBe GBR speed, PBR speed or the minimum bit rate of business, all edge customer one total n business.
In step (3), the up-link base station can measure the interference level of each PRB in real time; Downlink system then depends on each PRB is estimated in the base station in the transmission power information of each PRB interference level.
For up-link, the base station can measure the interference level on each PRB voluntarily: can adopt the measuring amount on each PRB of LTE standard definition to receive interference power and receive thermal noise power, and calculate interference level on each PRB based on these two measuring amount.
For downlink system, the interference level on each PRB depends on the transmitting power of base station at each PRB, the i.e. result of each cell downlink power division to a great extent.The normalization target signal to noise ratio that the base station can be distributed by the descending power of adding up each area interference sensitive users and non-sensitive user is respectively determined the interference level on each PRB.
Finish step (2) and (3) according to said method afterwards, in the step (4), just can with and the two is taken all factors into consideration, form district dynamic interfere information in the inside of base station, it mainly comprises for responsive PRB number of resources of presence of intercell interference and positional information, and for insensitive PRB number of resources of presence of intercell interference and positional information.
The resource that is used for inter-station interference coordinating use restriction strategy (as, HII, OI, RNTP even load information) method that produces can determine according to the implication of each load parameter.When resource is used restriction strategy between according to the implication generation base station of each load parameter, need take all factors into consideration the minizone dynamic disturbance information of each sub-district of above-mentioned inside of base station, resource use restriction strategy, the interfere information on each PRB and the traffic load information of Cell Edge User that other base station is informed this base station before.In addition, consider that the cycle of the minizone dynamic disturbance information measurement/renewal of each sub-district of inside of base station uses the update cycle of restriction strategy short than resource between the base station usually, therefore when determining that resource is used restriction strategy between the base station, use be before the minizone dynamic disturbance letter of each sub-district of inside of base station of obtaining in the several times measurement period.
Interference coordination information transmit-receive administration module comprises following processing unit: this base station sends to resource between the eNodeB of other base stations and uses restriction strategy to inform the unit, receives between the eNodeB that other base station resources use restricted informations resource via X2 interface and use the restriction strategy acquiring unit via X2 interface; If inner each the district dynamic interference coordination of eNodeB adopt distributed scheme (as, the processing of each district dynamic interference coordination is finished on different processor or integrated circuit board), then also should comprise inside of base station dynamic interference coordination information transmitting unit, inside of base station dynamic interference coordination information receiving unit.This module is mainly used in carries out resource between each eNodeB by X2 interface and uses the mutual of restricted information, for each sub-district of inside of base station, be centralized for the interference coordination processing mode of each sub-district or distributed resource is used the restricted information transmitting-receiving management can be had two kinds of implementations according to inside of base station:
If an inside of base station sub-district still adopt distributed interference coordination schemes (as, the processing of each district dynamic interference coordination is finished on different processor or integrated circuit board), then need depend on this information transmit-receive administration module equally and carry out the mutual of inside of base station minizone dynamic disturbance information;
If the employing centralized solution (as, the processing of each district dynamic interference coordination is finished on same processor or integrated circuit board), then do not need to carry out the mutual of inside of base station minizone dynamic disturbance information between inner each sub-district of eNodeB by this module.
Between eNodeB/eNodeB internal interference harmony messages processing module comprises following processing unit: information receiving unit (being used to finish resource between the eNodeB that this base station of comprising each district dynamic interfere information of inside of base station produces uses resource between the eNodeB that restriction strategy, other base station produce to use the reception of restriction strategy); The scheduling strategy generation unit of each each Resource Block of sub-district of inside of base station; The scheduling strategy of each each Resource Block of sub-district of inside of base station is informed the unit.Resource is used between the eNodeB that restriction strategy, this eNodeB produce resource to use restriction strategy and is used in this eNodeB between each sub-district the dynamic disturbance information of interference mitigation and takes all factors into consideration between the eNodeB that this module will obtain via X2 interface simultaneously, forms final interference mitigation and makes a strategic decision.The resource that this decision-making is taken all factors into consideration between eBodeB is used the minizone dynamic disturbance information of restriction strategy and eNodeB inside, and it shows as the adjustment for dissimilar users' PRB scheduling strategy.
According to scheduler between interface different, the PRB scheduling strategy of interference coordination message processing module output is difference to some extent:
A) there are two interfaces as if itself and scheduler, one of them interface is used to export resource between eNodeB and uses the adjustment of restricted information to the PRB scheduling strategy, and another interface is used to export between the eNodeB internal zone dynamic disturbance information to the adjustment of each sub-district PRB scheduling strategy.That is:
R
inter_ICIC＝f(load_information，location_information，…)
Wherein load_information is meant HII, OI, RNTP even load information, that is resource is used restriction strategy between eNodeB, and location_information is a position area information, as Cell Center User/edge customer information.The output result be that it is the function of the positional information of load information between eNodeB, UE according to the PRB scheduling strategy of definite all kinds of UE such as the positional information of load information, UE between eNB.
P
intra_dynIC＝g(dynIC_information，…)
Wherein dynIC_information is the minizone dynamic disturbance information of eNodeB inside, according to the specific design of dynamic interference coordination algorithm, and the information that also may need to determine other of PRB scheduling strategy.Output is P as a result
Intra_dynICBe the PRB scheduling strategy of all kinds of UE that determine according to eNB internal interference harmony messages etc., it is the function of eNB internal interference harmony messages.
B) only there is an interface as if itself and scheduler, then this interface need be taken all factors into consideration resource use restriction strategy information and inner each the district dynamic interfere information of eNodeB between eNodeB, form the PRB scheduling strategy of dynamic interference coordination then, this PRB scheduling strategy can be determined according to following dual mode:
B1): the expression formula of PRB scheduling strategy is
P
RRC_IM＝h(P
intra_dynIC，P
inter_ICIC)
Parameter P wherein
Inter_ICICAnd P
Intra_dynICCan determine according to the method a); P
RRC_IMPRB scheduling strategy for final output.
B2): the expression formula of PRB scheduling strategy is
Wherein parameter l oad_information is meant HII, OI, RNTP even load information, that is resource is used restriction strategy between eNodeB; DynIC_information is each district dynamic interfere information of eNB inside; Location_information is a position area information, as Cell Center User/edge customer information; P
RRC_IMPRB scheduling strategy for final output.
Situation for above-mentioned output one cover PRB scheduling strategy and two cover PRB scheduling strategies, the two respectively has its pluses and minuses: the cover PRB scheduling strategy of situation only export to(for) the dynamic interference coordination module, scheduler does not need the source of PRB scheduling strategy is considered, so the handling process of scheduler is single relatively; But its shortcoming is, resource is used restriction strategy, is used restriction strategy from the resource of other base stations that X2 interface receives when between the dynamic disturbance information of each minizone of inside of base station, base station that other base stations are exported in this base station, when any one information of three changes, all will trigger the renewal of this cover PRB scheduling strategy.Situations for using two cover PRB scheduling strategies need scheduler that it is considered respectively and integrated treatment, thus the handling process relative complex of scheduler some; Its advantage is based on this base station and exports to resource use restriction strategy between the base station of other base stations, long from the common cycle of upgrading of PRB scheduling strategy that the resource of other base stations that X2 interface receives uses restriction strategy to generate, and the PRB scheduling strategy update cycle that generates based on the dynamic disturbance information of each minizone of inside of base station is shorter, and it is divided into the computation complexity that two parts can reduce the PRB scheduling resource.
The implementation method of above-mentioned minizone dynamic interference coordination resource dispatching strategy in each scheduler is as follows:
A) if between eNodeB/have two kinds of interfaces between eNodeB internal interference harmony messages processing module and the scheduler, then can carry out interference coordination: the time for each UE Resources allocation according to following mode, information such as the channel quality (CQI) of this UE of needs consideration, transfer of data demand, terminal capability are with the overall performance of assurance system and the performance of UE, need also simultaneously to consider between eNodeB/the various PRB scheduling strategies of eNodeB internal interference harmony messages processing module output that the reduction that can try one's best is like this disturbed in the performance of assurance system, UE.This moment is as follows for the method that UE carries out resource allocation:
P
schdul_IM＝η(P
schul_CQI，P
intra_dynIC，P
inter_ICIC，…)
P wherein
Schdul_CQIIt is the decision-making of considering that other factors carries out.Final scheduling strategy is P
Inter_ICIC, P
Intra_dynIC, P
Schdul_CQIEtc. the coefficient result of multiple factor.
B) if between eNodeB/ only have a kind of interface between eNodeB internal interference harmony messages processing module and the scheduler, then can carry out resource allocation decisions according to following mode:
P
schdul_IM＝θ(P
schul_CQI，P
RRC_IM，…)
P wherein
Schdul_CQIIt is the decision-making of considering that other factors carries out.Final scheduling strategy is P
RRC_IM, P
Schdul_CQIEtc. the coefficient result of multiple factor.
The present invention proposes a kind of interference coordination of LTE system optimization/alleviate scheme, it is the minizone dynamic interference coordination, this schemes synthesis has been considered the mutual characteristics of LTE system centralized management entity internal information, interference coordination schemes between the centralized management entity of combined standard definition forms a kind of more optimal interference coordination/alleviate scheme.By this method, can alleviate the interference between inner each sub-district of centralized management entity, and alleviate because information interaction is untimely or load information can not well adapt to the phenomenon of the interference mitigation poor effect that dynamic change caused of wireless channel environment.This method can further alleviate the presence of intercell interference of LTE system, quality of services for users in elevator system overall throughput performance and the system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (23)
1. a method of carrying out each district dynamic interference coordination of inside of base station is characterized in that, this method may further comprise the steps:
Obtain this inside of base station interference coordination information, utilize first scheduling strategy of described this inside of base station of inside of base station interference coordination information acquisition sub-district;
First scheduling strategy of described inside of base station sub-district is notified the scheduler of this inside of base station respective cell;
The scheduler of each sub-district of this inside of base station is dispatched according to first scheduling strategy of correspondence.
2. method according to claim 1 is characterized in that, this method further comprises:
Utilize the resource between described inside of base station interference coordination information, this base station that obtains and the mutual base station to use restriction strategy information, obtain second scheduling strategy;
Second scheduling strategy is notified the scheduler of this inside of base station respective cell;
Then the scheduler of each sub-district of this inside of base station is dispatched according to first scheduling strategy and second scheduling strategy of correspondence.
3. method according to claim 1 is characterized in that, described inside of base station interference coordination information comprises:
The load information or the resource use restriction strategy of other base station informed in this base station, and each district dynamic interfere information of this inside of base station.
4. method according to claim 3 is characterized in that, when containing each district dynamic interfere information of this inside of base station in described the inside of base station interference coordination information, then obtains each district dynamic interference coordination information of this inside of base station according to following steps, comprising:
Determine that the user for the presence of intercell interference sensitivity gathers in each sub-district of inside of base station;
Estimate that each sub-district of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand in the certain hour section;
Determine the interference level information on each PRB, and compare with predefined threshold value;
According to the PRB user demand of each sub-district of determining for the terminal of presence of intercell interference sensitivity, and the interference level that obtains obtains district dynamic interfere information in the inside of base station above the PRB information of predefined threshold value.
5. method according to claim 4 is characterized in that, the user for the presence of intercell interference sensitivity in each sub-district of inside of base station determines according to one or more information:
Each user's Geometry distributed intelligence and the information that enters/leave certain cell edge that obtains based on the A3 incident of LTE standard definition in each user's information on path loss, the sub-district in the sub-district.
6. method according to claim 5 is characterized in that, each user's information on path loss is determined in each sub-district of inside of base station specifically to comprise for the user of presence of intercell interference sensitivity in according to the sub-district:
With the information on path loss of the terminal obtained and predefined threshold T HPL relatively, if the path loss of UE is greater than default threshold T HPL, then this terminal is in cell edge, expression belongs to the user of inside of base station presence of intercell interference sensitivity, wherein, the power space according to this terminal reports the PHR information acquisition during information on path loss of described terminal.
7. method according to claim 5 is characterized in that, each user's information on path loss is determined in each sub-district of inside of base station specifically to comprise for the user of presence of intercell interference sensitivity in according to the sub-district:
In a time period, obtain the PHR reporting information of each terminal in the sub-district, and go out the information on path loss of terminal based on the PHR information calculations;
If the path loss of terminal is greater than the path loss values of setting, then this terminal is in cell edge.
8. method according to claim 4 is characterized in that, estimates that each sub-district of inside of base station comprises for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand in the certain hour section:
In acquisition each subframe in time period T, all disturb the resource number Nused that sensitive users is on average used in the sub-district;
Statistics is the total actual transfer rate SBR of all interference sensitive users of each sub-district in time period T;
The formula of estimating resource demand is:
Wherein Rk is professional GBR speed, PBR speed or minimum bit rate, all edge customer one total n business.
9. method according to claim 2 is characterized in that, obtains the cycle of this inside of base station interference coordination information, less than the cycle of obtaining the resource use restriction strategy information between this base station and the mutual base station.
10. method according to claim 2 is characterized in that, this method further comprises:
Utilize first scheduling strategy and second scheduling strategy to generate the 3rd scheduling strategy of each sub-district correspondence;
Then first scheduling strategy of described inside of base station sub-district is notified the scheduler of this inside of base station respective cell, and is notified the scheduler of this inside of base station respective cell, comprising second scheduling strategy:
The 3rd scheduling strategy of each sub-district correspondence is sent to the scheduler of respective cell;
And the scheduler of each sub-district of this inside of base station is dispatched according to first scheduling strategy and second scheduling strategy of correspondence, comprising:
The scheduler of each sub-district of this inside of base station carries out resource allocation according to the 3rd scheduling strategy of correspondence to the resource unification of this sub-district.
11. method according to claim 2 is characterized in that, notifies the scheduler of each sub-district with the scheduling strategy of described each sub-district of inside of base station, comprising:
Respectively first scheduling strategy and second scheduling strategy are notified to the scheduler of each sub-district, and the announcement period of announcement period sub-district second scheduling strategy of first scheduling strategy.
12. method according to claim 1 and 2 is characterized in that, this method further comprises:
According to the scheduling strategy of each sub-district of this inside of base station, determine that this base station requires the resource of mutual base station to use restriction strategy information, and this base station that will determine requires the resource of mutual base station to use restriction strategy information to be notified to each mutual base station.
13. the device of a district dynamic interference coordination is characterized in that, this device comprises:
First information acquiring unit is used to obtain this inside of base station interference coordination information;
The scheduling strategy generation unit utilizes first scheduling strategy of described each sub-district of this inside of base station of inside of base station interference coordination information acquisition;
The scheduling strategy notification unit is used for the scheduler with described first scheduling strategy notice respective cell;
Scheduler is used for dispatching according to first scheduling strategy of receiving.
14. device according to claim 13 is characterized in that, this device further comprises:
Second information acquisition unit, the resource that is used to obtain between this base station and the mutual base station is used restriction strategy information;
Then the scheduling strategy generation unit is further used for utilizing the resource between described inside of base station interference coordination information, this base station that obtains and the mutual base station to use restriction strategy information, obtains second scheduling strategy;
Described scheduling strategy notification unit is further used for second scheduling strategy is notified the scheduler of this inside of base station respective cell;
Described scheduler is used for dispatching according to first scheduling strategy of receiving and second.
15. device according to claim 14 is characterized in that, described inside of base station interference coordination information comprises:
The load information or the resource use restriction strategy of other base stations informed in this base station, and each district dynamic interfere information of this inside of base station.
16. device according to claim 15 is characterized in that, when containing each district dynamic interfere information of this inside of base station in described the inside of base station interference coordination information,
Described first information acquiring unit is used for determining the user set of each sub-district of inside of base station for the presence of intercell interference sensitivity; Estimate that each sub-district of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand in the certain hour section; Determine the interference level information on each PRB, and compare with predefined threshold value, according to of the PRB user demand of each sub-district of determining for the terminal of presence of intercell interference sensitivity, and the interference level that obtains obtains district dynamic interfere information in the inside of base station above the PRB information of predefined threshold value.
17. device according to claim 15 is characterized in that, described first information acquiring unit is used for determining the user of each sub-district of inside of base station for the presence of intercell interference sensitivity according to one or more information:
Each user's Geometry distributed intelligence and the information that enters/leave certain cell edge that obtains based on the A3 incident of LTE standard definition in each user's information on path loss, the sub-district in the sub-district.
18. device according to claim 17, it is characterized in that, described first information acquiring unit, be used for the information on path loss of the terminal that will obtain and predefined threshold T HPL relatively, if the path loss of UE is greater than default threshold T HPL, then this terminal is in cell edge, and expression belongs to the user of inside of base station presence of intercell interference sensitivity, wherein, the power space according to this terminal reports the PHR information acquisition during information on path loss of described terminal.
19. device according to claim 17 is characterized in that, described first information acquiring unit is used for obtaining the PHR reporting information of each terminal in the sub-district in a time period, and goes out the information on path loss of terminal based on the PHR information calculations; If the path loss of terminal is greater than the path loss values of setting, then this terminal is in cell edge.
20. device according to claim 16, it is characterized in that, described first information acquiring unit, be used for estimating according to following steps the Physical Resource Block PRB user demand of each community user of inside of base station in the certain hour section: obtain each subframe in time period T, all disturb the resource number Nused that sensitive users is on average used in the sub-district; Statistics is the total actual transfer rate SBR of all interference sensitive users of each sub-district in time period T; The formula of estimating resource demand is:
R wherein
kBe GBR speed, PBR speed or the minimum bit rate of business, all edge customer one total n business.
21. device according to claim 14 is characterized in that, described scheduling strategy generation unit is further used for utilizing first scheduling strategy and second scheduling strategy to generate the 3rd scheduling strategy of each sub-district correspondence;
Then described scheduling strategy notification unit is used for sending the scheduler that this inside of base station respective cell is notified first scheduling strategy and second scheduling strategy in the realization of the 3rd scheduling strategy by the scheduler to this inside of base station respective cell;
Described scheduler is used for according to the 3rd scheduling strategy of correspondence resource allocation being carried out in the resource unification of this sub-district.
22. device according to claim 14, it is characterized in that, described scheduling strategy notification unit is used for respectively first scheduling strategy and second scheduling strategy are notified to the scheduler of each sub-district and the announcement period of announcement period sub-district second scheduling strategy of first scheduling strategy.
23. device according to claim 14 is characterized in that, this device also further comprises:
The 3rd information acquisition unit is used for first scheduling strategy and second scheduling strategy according to each sub-district of this inside of base station, determines that this base station requires the resource of mutual base station to use restriction strategy information;
Described scheduling strategy notification unit, this base station that is further used for determining require the resource of mutual base station to use restriction strategy information to be notified to each mutual base station.
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| CN103209472A (en) * | 2012-01-12 | 2013-07-17 | 中兴通讯股份有限公司 | Method and system for cooperative scheduling of inter-cell uplink interference coordination |
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| CN103209472B (en) * | 2012-01-12 | 2017-11-14 | 中兴通讯股份有限公司 | A kind of method and system for carrying out cooperative scheduling inter-cell uplink interference coordination |
| CN103634919A (en) * | 2013-12-03 | 2014-03-12 | 北京邮电大学 | Household base station and method for distributing resources for same on basis of interference coordination |
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| CN106452651B (en) * | 2016-10-10 | 2019-02-22 | 烽火通信科技股份有限公司 | The realization method and system of dynamic interference coordination based on RB interference information under LTE |
| CN114449541B (en) * | 2020-10-30 | 2023-10-27 | 中国移动通信集团浙江有限公司 | Abnormal perception cell positioning method, device, equipment and readable medium |
| WO2023109244A1 (en) * | 2021-12-17 | 2023-06-22 | 中兴通讯股份有限公司 | Method and apparatus for inter-cell interference coordination, server, and storage medium |
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