CN102131246B - 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, refer to especially a kind of method and device that carries out each district dynamic interference coordination of inside of base station.
Background technology
At Long Term Evolution (Long Term Evolution, LTE) in system, by adopting OFDM (Orthogonal Frequency Division Multiplexing at down link, OFDM) transmission technology, in up link, adopt SC-FDMA (Single Carrier-Frequency Division MultipleAccess, single-carrier frequency division multiple access) technology, has preferably resolved the problem of disturbing in community.Therefore the interference being subject to for LTE system Er Yan，Ge community is mainly from two parts: thermal noise and presence of intercell interference in community (ICI, Inter-Cell Interference).Traditional communication technology and signal processing technology (as, matched filtering) can eliminate preferably the harmful effect that thermal noise brings.For presence of intercell interference, common cell mobile communication systems is that the method by channeling (being the resource that different frequency range is used in neighbor cell) realizes the object that alleviates presence of intercell interference, but has so directly caused the not high shortcoming of system frequency resource utilance.
In LTE system, in order to realize as much as possible identical networking, LTE standard determines to adopt semi-static Inter-Cell Interference Coordination (Inter-Cell Interference Coordination, ICIC) technology, and defined ICIC technology required at the mutual related resource restriction strategy of X2 interface (or being called load information), as HII (High Interference Indicator, high interference indication), OI (Overload Indicator, overload indication), RNTP (Relative-narrowband Tx Power indicator, Relative Narrowband TX Power indication) etc.The load information that ICIC technology produces by this community and the neighboring cell loading information receiving are made the decision-making that restriction resource is used, and this decision-making are informed to the modules such as scheduling, power control are to reach the object of Inter-Cell Interference Coordination.
The modules such as scheduler, power control have been received that ICIC module is made when resource is used after restriction decision-making in ，Wei Zhe community each dispatched users distribution frequency domain resource, power resource and have been followed this restriction, thereby realized the interference mitigation that coordinate mutually minizone.
In actual scene, more than one of the number of cells that Yi Ge base station is supported conventionally, as, three sector systems, LTE standard code, an eNodeB supports 256Ge community at the most simultaneously, under such scene, due to base station can know simultaneously each community specific to the resource allocation information of each scheduling and the various relevant informations of respectively dispatching UE, therefore, the interaction time delay of X2 interface and capacity limit are no longer the limiting factors of restriction inter-cell interference mitigation scheme, and more optimal interference mitigation scheme can realize.
LTE system reduces in the method for presence of intercell interference at present, there is no by utilizing the feature of information interaction between the interior a plurality of communities of same centralized management entity (as eNodeB) to implement the open scheme of inter-cell interference mitigation.
In LTE system, because Access Network side does not exist central controlled network entity, therefore said method depends on related load information mutual of X2 interface (interface between base station), consider that X2 interface capacity is limited and there is certain interaction time delay, therefore between this method Ge community, mutual information is very limited, and has the longer 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); Visible, the cycle of the load information interaction that above dependence X2 interface carries out is far longer than the scheduling interval of system (LTE system call is spaced apart 1ms).
And in actual scene, due to user's the reasons such as random movement, each user's channel circumstance is acute variation normally; The traffic load of ，Ge community is also dynamic change in addition, and specific to each scheduling, the difference between each scheduling in same community is also very large.
Therefore, restriction due to 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 object that reduces presence of intercell interference by the fully mutual utilizable various information of inter-cell interference mitigation.So the method based on above-mentioned ICIC, can not well guarantee the efficient utilization of resource, has the shortcoming that system spectral efficiency is not high, throughput of system performance is undesirable.
Summary of the invention
The invention provides method and the device of each district dynamic interference coordination of a kind of inside of base station, can carry out more accurately, flexibly interference coordination processing, and can further improve 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 present invention provides, comprising:
Obtain this inside of base station interference coordination information, utilize the first scheduling strategy of described inside of base station interference coordination this inside of base station of information acquisition community;
The first scheduling strategy of described inside of base station community is notified to the scheduler of this inside of base station respective cell;
The scheduler of each community of this inside of base station is dispatched according to the first scheduling strategy of correspondence.
The device of a kind of district dynamic interference coordination that the embodiment of the present invention provides, comprising:
First information acquiring unit, for obtaining this inside of base station interference coordination information;
Scheduling strategy generation unit, utilizes the first scheduling strategy of described each community of inside of base station interference coordination this inside of base station of information acquisition;
Scheduling strategy notification unit, for notifying described the first scheduling strategy the scheduler of respective cell;
Scheduler, for dispatching according to the first scheduling strategy of receiving.
In the embodiment of the present invention, by the first scheduling strategy of each community of this inside of base station interference coordination this inside of base station of information acquisition of obtaining; Then the scheduler of the first scheduling strategy notice respective cell of described each community of inside of base station is dispatched to use.While carrying out interference mitigation between embodiment of the present invention Ge community, take into full account centralized management entity internal information and obtain the feature with information interaction, design more efficiently, interference mitigation scheme flexibly.By interference mitigation scheme provided by the invention, can better reduce the interference between LTE system cell; Compare with common interference mitigation scheme (as, semi-static ICIC), this scheme has more accurately, feature flexibly, can further improve spectrum efficiency and the resource utilization of system.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the embodiment of the present invention is carried out the method for each district dynamic interference coordination of inside of base station;
Fig. 2 is the structural representation that the embodiment of the present invention is carried out the device of each district dynamic interference coordination of inside of base station;
Fig. 3 is a specific embodiment of apparatus of the present invention.
Embodiment
Shown in Figure 1, the method for the embodiment of the present invention comprises the following steps:
Step 101: obtain this inside of base station interference coordination information.
Described inside of base station interference coordination information can comprise: 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: the first scheduling strategy that utilizes described each community of inside of base station interference coordination this inside of base station of information acquisition.
While containing each district dynamic interfere information of this inside of base station in described inside of base station interference coordination information, can obtain each district dynamic interference coordination information of this inside of base station according to following steps, comprise:
Determine that in each community of inside of base station, the user for presence of intercell interference sensitivity gathers;
Estimate in certain hour section that each community of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand;
Determine the interference level information on each PRB, and compare with predefined threshold value; According to determining the PRB user demand of Ge community for the terminal of presence of intercell interference sensitivity, and the interference level obtaining is over the PRB information of predefined threshold value, obtains district dynamic interfere information in inside of base station.
User for presence of intercell interference sensitivity in each community of inside of base station can determine according to one or more information:
The information that enters/leave certain cell edge that in community, in each user's information on path loss, community, each user's Geometry distributed intelligence and the A3 event based on LTE standard definition obtain.
Each user's information on path loss is determined in each community of inside of base station the user for presence of intercell interference sensitivity according to community, can specifically realize like this: by the information on path loss of the terminal of obtaining and predefined threshold T HPL comparison, if the path loss of UE is greater than default threshold T HPL, this terminal is in cell edge, represent to belong to the user of inside of base station presence of intercell interference sensitivity, wherein, according to the power space of this terminal, report PHR information acquisition during the information on path loss of described terminal.
Each user's information on path loss is determined in each community of inside of base station the user for presence of intercell interference sensitivity according to community, can specifically realize like this: within a time period, obtain the PHR reporting information of each terminal in community, and based on PHR information, calculate the information on path loss of terminal; If the path loss of terminal is greater than the path loss values of setting, this terminal is in cell edge.
Estimate in certain hour section that each community of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand, can realize like this: obtain the resource number Nused that in each the subframe Zhong， community in time period T, all interference sensitive users are on average used; Statistics is at the total actual transfer rate SBR of all interference sensitive users in time period T Nei Ge community; The formula of estimating resource demand is:
r wherein
kfor GBR speed, PBR speed or the minimum bit rate of business, total n the business of all edge customers one.
In implementation procedure, the cycle of obtaining this inside of base station interference coordination information can be less than the cycle of the resource use restriction strategy information of obtaining between this base station and interacting base station.
Step 103: by the scheduler of the first scheduling strategy notice respective cell of described inside of base station.
Step 104: the scheduler of each community of this inside of base station is dispatched according to the 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 obtaining and interacting base station to use restriction strategy information, obtain the second scheduling strategy; The second scheduling strategy is notified to the scheduler of this inside of base station respective cell; The scheduler of each community of this inside of base station carries out United Dispatching according to the first scheduling strategy of correspondence and the second scheduling strategy.
Resource between described this base station and interacting base station is used restriction strategy information to comprise the load information transmitting by X2 interface.
In embodiments of the present invention, can also utilize the first scheduling strategy and the second scheduling strategy to generate the 3rd scheduling strategy corresponding to each community; The first scheduling strategy of described inside of base station community is notified to 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 corresponding to each community is sent to respective cell; The scheduler of each community of this inside of base station carries out resource distribution according to the resource unification of the 3rd scheduling strategy Dui Zhe community of correspondence.
Here, the scheduler of each community of this inside of base station can use the dynamic disturbance information of restricted information and each community of inside of base station to dispatch according to resource between the channel quality information of dispatch terminal, interacting base station.
In the embodiment of the present invention, the method may further include: according to the scheduling strategy of each community of this inside of base station, determine that this base station requires the resource of interacting base station to use restriction strategy information, and require the resource of interacting base station to use restriction strategy information to notify to each interacting base station this base station of determining.
Shown in Figure 2, the device of a kind of district dynamic interference coordination of the embodiment of the present invention, comprising:
First information acquiring unit 21, for obtaining this inside of base station interference coordination information;
Scheduling strategy generation unit 23, utilizes the first scheduling strategy of described each community of inside of base station interference coordination this inside of base station of information acquisition;
Scheduling strategy notification unit 24, for notifying described the first scheduling strategy the scheduler of respective cell;
Scheduler 25, for dispatching according to the first scheduling strategy of receiving.
This device may further include: the second information acquisition unit 22, for the resource of obtaining between this base station and interacting base station, use restriction strategy information;
Scheduling strategy generation unit 23, are further used for utilizing the resource between described inside of base station interference coordination information, this base station obtaining and interacting base station to use restriction strategy information, obtain the second scheduling strategy;
Described scheduling strategy notification unit 24, is further used for the second scheduling strategy to notify the scheduler of this inside of base station respective cell;
Described scheduler 25, for dispatching according to the first scheduling strategy and second of receiving.
Described inside of base station interference coordination information comprises:
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.
While containing each district dynamic interfere information of this inside of base station in described inside of base station interference coordination information, described first information acquiring unit 21, for determining that each community of inside of base station is for user's set of presence of intercell interference sensitivity; Estimate in certain hour section that each community of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand; Determine the interference level information on each PRB, and compare with predefined threshold value, according to determining the PRB user demand of Ge community for the terminal of presence of intercell interference sensitivity, and the interference level obtaining is over the PRB information of predefined threshold value, obtains district dynamic interfere information in inside of base station.
Described first information acquiring unit 21, for determining that according to one or more information each community of inside of base station is for the user of presence of intercell interference sensitivity:
The information that enters/leave certain cell edge that in community, in each user's information on path loss, community, each user's Geometry distributed intelligence and the A3 event based on LTE standard definition obtain.
Described first information acquiring unit 21, be used for the information on path loss of the terminal of obtaining and predefined threshold T HPL comparison, if the path loss of UE is greater than default threshold T HPL, this terminal is in cell edge, represent to belong to the user of inside of base station presence of intercell interference sensitivity, wherein, according to the power space of this terminal, report PHR information acquisition during the information on path loss of described terminal.
Described first information acquiring unit 21, for obtain the PHR reporting information of each terminal in community within a time period, and calculates the information on path loss of terminal based on PHR information; If the path loss of terminal is greater than the path loss values of setting, this terminal is in cell edge.
Described first information acquiring unit 21, for estimate the Physical Resource Block PRB user demand of each community user of inside of base station in certain hour section according to following steps: obtain the resource number Nused that in each the subframe Zhong， community in time period T, all interference sensitive users are on average used; Statistics is at the total actual transfer rate SBR of all interference sensitive users in time period T Nei Ge community; The formula of estimating resource demand is:
r wherein
kfor GBR speed, PBR speed or the minimum bit rate of business, total n the business of all edge customers one.
Described scheduling strategy generation unit 23, is further used for utilizing the first scheduling strategy and the second scheduling strategy to generate the 3rd scheduling strategy corresponding to each community;
Described scheduling strategy notification unit 24, sends the 3rd scheduling strategy realization for the scheduler by this inside of base station respective cell and the first scheduling strategy and the second scheduling strategy is notified to the scheduler of this inside of base station respective cell;
Described scheduler 25, for carrying out resource distribution according to the resource unification of the 3rd scheduling strategy Dui Zhe community of correspondence.
Described scheduling strategy notification unit 24, for respectively by the scheduler of the first scheduling strategy and the second scheduling strategy notice Gei Ge community, and the announcement period of announcement period community second scheduling strategy of the first scheduling strategy.
This device can further include:
The 3rd information acquisition unit, for according to the scheduling strategy of each community of this inside of base station, determines that this base station requires the resource of interacting base station to use restriction strategy information;
Described scheduling strategy notification unit, is further used for this base station of determining to require the resource of interacting base station to use restriction strategy information to notify to each interacting base station.
Below lift specific embodiment and describe technical scheme of the present invention in detail.
The embodiment of the present invention is the feature between community by abundant knot with while there is centralized management entity, has provided a kind of interference mitigation scheme of optimization, and the centralized management node eNodeB existing in LTE system of take is example.
In order to reach the object of minizone dynamic interference coordination, the device of the embodiment of the present 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 units: the acquiring unit of each district dynamic interfere information of inside of base station, between base station, mutual resource is used the generation unit of restriction strategy, information notification unit (comprising that between inside of base station dynamic disturbance information, eNodeB, resource is used informing of restricted information).
Here eNodeB internal interference harmony messages comprises 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 community 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 more abundant, more accurate information type for inside of base station dynamic interference coordination.
The interference coordination information of using between each community of inside of base station can produce/upgrade according to following thinking: pre-estimate the user demand for PRB to the user of ICI sensitivity of eNodeB Nei Ge community, in conjunction with the interference level on each PRB, determine the interference coordination information state parameter on each PRB of each community.
The method that in inside of base station, district dynamic interfere information obtains is as follows:
(1) determine that in each community of inside of base station, the user for presence of intercell interference sensitivity gathers;
(2) estimate that in a period of time T, each community of inside of base station belongs to the UE of interference sensitive users set for the demand of PRB resource;
(3) according to the 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 to mark;
(4) according to determining in (2) that Ge community is for the number of the required PRB of user of presence of intercell interference sensitivity, and the interference level obtaining in (3) surpasses the PRB information of predefined threshold value, district dynamic interfere information in generation inside of base station.
In step (1), the user's set for presence of intercell interference sensitivity in each community 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 conventionally, and Cell Center User is subject to presence of intercell interference effect lower substantially, therefore Cell Edge User can be included into the user's set for presence of intercell interference sensitivity.
(b) determination methods of Cell Edge User can be based on one or more of following information: the information that enters/leave certain cell edge that each user's Geometry distributed intelligence in each user's information on path loss, community in community, the A3 event based on LTE standard definition obtain, etc.;
For (b), based on information on path loss, judge that whether user is as follows in the method for cell edge:
(b1) obtain PHR (the Power Headroom Report of UE, power space reports) reporting information, in PHR information, in fact comprise the content of three parts: the information on path loss of UE, base station be the information to UE for RRC (Radio Resource Control) the layer configuration of the scheduling reporting as time PHR and resource allocation information (as giving how many PRB of this UE), base station;
(b2) for base station, base station is for the scheduling and the resource allocation information that report as time PHR, and the information that the RRC of base station (Radio Resource Control) layer configures to UE is all known, therefore, the PHR information reporting according to UE, base station can solve the information on path loss of UE;
(b3), after obtaining the information on path loss of UE, can judge that this UE is in center of housing estate or in cell edge by following two kinds of methods:
Method one: will report information on path loss and the predefined threshold T HPL comparison of obtaining according to the PHR of UE, if the path loss of UE is greater than default threshold T HPL, this UE is in cell edge; Otherwise this UE is positioned at center of housing estate.
Method two: obtain the PHR reporting information of each UE in community in a period of time T, and calculate the information on path loss of UE based on PHR information; Then the information on path loss of all UE is formed to CDF (Cumulative Distribution Function, cumulative distribution function) curve, at the x% of curve, (the bent value of x is between 1～99, 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, this UE is in cell edge; Otherwise this UE is positioned at center of housing estate.
In step (2), in estimation a period of time T, each community of inside of base station belongs to and disturbs the UE of sensitive users set as follows for the method for the demand of PRB resource:
Determine timing statistics length T, obtain the resource number Nused that in each the subframe Zhong， community in statistics duration T, all interference sensitive users are on average used;
Statistics is at the total actual transfer rate SBR of all interference sensitive users in time period T cabinet community;
The formula of estimating resource demand is:
r wherein
kfor GBR speed, PBR speed or the minimum bit rate of business, total n the business of all edge customers one.
In step (3), up-link base station can measure the interference level of each PRB in real time; Downlink system depends on base station and in the transmission power information of each PRB, estimates the interference level of each PRB.
For up-link, base station can measure the interference level on each PRB voluntarily: can adopt the measuring amount on each PRB of LTE standard definition receive interference power and receive thermal noise power, and calculate the interference level on each PRB based on these two measuring amount.
For downlink system, the interference level on each PRB depends on that base station is in the transmitting power of each PRB to a great extent, i.e. the result of each cell downlink power division.The interference level on each PRB can be determined by adding up respectively the normalization target signal to noise ratio of each area interference sensitive users and non-sensitive user's descending power distribution in base station.
According to said method, complete step (2) and (3) afterwards, in step (4), just can by and the two considers, form district dynamic interfere information in inside of base station, it mainly comprises for the responsive PRB number of resources of presence of intercell interference and positional information, and for the insensitive PRB number of resources of presence of intercell interference and positional information.
For the resource of 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 the implication generation base station according to each load parameter, need to consider the minizone dynamic disturbance information of each community 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 community of inside of base station used the update cycle of restriction strategy short than resource between base station conventionally, therefore when determining that between base station, resource is used restriction strategy, use be before the minizone dynamic disturbance letter of each community of inside of base station of obtaining in 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 to use restriction strategy to inform unit via X2 interface, via X2 interface, receive resource between the eNodeB that other base station resources use restricted informations uses restriction strategy acquiring unit; If inner each district dynamic interference coordination of eNodeB adopt distributed scheme (as, the processing of each district dynamic interference coordination completes on different processor or board), 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 carrying out resource between each eNodeB by X2 interface and uses the mutual of restricted information, for each community of inside of base station, according to inside of base station, for the interference coordination processing mode of each community, be that centralized or distributed resource is used restricted information transmitting-receiving management can have two kinds of implementations:
If an inside of base station community still adopt distributed interference coordination schemes (as, the processing of each district dynamic interference coordination completes on different processor or board), need to depend on equally this information transmit-receive administration module and carry out the mutual of inside of base station minizone dynamic disturbance information;
If employing centralized solution (as, the processing of each district dynamic interference coordination completes on same processor or board), between inner each community of eNodeB, do not need to carry out the mutual of inside of base station minizone dynamic disturbance information by this module.
Between eNodeB/eNodeB internal interference harmony messages processing module comprises following processing unit: information receiving unit (comprise for completing resource between the eNodeB that this base station of each district dynamic interfere information of inside of base station produces use 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 community of inside of base station; The scheduling strategy of each each Resource Block of community of inside of base station is informed unit.This module is used resource between the eNodeB obtaining via X2 interface resource between the eNodeB that restriction strategy, this eNodeB produce use restriction strategy and consider for the dynamic disturbance information of interference mitigation between this eNodeB Nei Ge community simultaneously, forms final interference mitigation decision-making.The resource that this decision-making considers between eBodeB is used the minizone dynamic disturbance information of restriction strategy and eNodeB inside, and it shows as the adjustment for dissimilar user's PRB scheduling strategy.
According to from scheduler between interface different, the PRB scheduling strategy of interference coordination message processing module output is difference to some extent:
If there are two interfaces in itself and scheduler a), one of them interface is used the adjustment of restricted information to PRB scheduling strategy, the adjustment of another interface for exporting dynamic disturbance information Dui Ge community PRB scheduling strategy between eNodeB internal zone for exporting resource between eNodeB.That is:
R
inter_ICIC＝f(load_information，location_information，…)
Wherein load_information refers to HII, OI, RNTP even load information, that is between eNodeB, resource is used restriction strategy, and location_information is position area information, as Cell Center User/edge customer information.Output rusults is the PRB scheduling strategy of all kinds of UE that determine according to the positional information of load information, UE between eNB etc., and it is the function of the positional information of load information between eNodeB, UE.
P
intra_dynIC＝g(dynIC_information，…)
Wherein dynIC_information is the minizone dynamic disturbance information of eNodeB inside, and according to the specific design of dynamic interference coordination algorithm, determining of PRB scheduling strategy also may need other information.Output rusults P
intra_dynICfor 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) if only there is an interface in itself and scheduler, this interface need to consider resource use restriction strategy information and inner each district dynamic interfere information of eNodeB between eNodeB, then form the PRB scheduling strategy of dynamic interference coordination, this PRB scheduling strategy can be determined according to following two kinds of modes:
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 in a); P
rRC_IMpRB scheduling strategy for final output.
B2): the expression formula of PRB scheduling strategy is
Wherein parameter l oad_information refers to HII, OI, RNTP even load information, that is between eNodeB, resource is used restriction strategy; DynIC_information is each district dynamic interfere information of eNB inside; Location_information is position area information, as Cell Center User/edge customer information; P
rRC_IMpRB scheduling strategy for final output.
Situation for a set of PRB scheduling strategy of above-mentioned output and two cover PRB scheduling strategies, the two respectively has its pluses and minuses: a set of PRB scheduling strategy of situation only export to(for) dynamic interference coordination module, scheduler does not need the source of PRB scheduling strategy to consider, so the handling process of scheduler is relatively single; But its shortcoming is, the resource of other base stations of exporting to resource between the base station of other base stations when the dynamic disturbance information ,Zhe base station of each minizone of inside of base station and using restriction strategy, receiving from X2 interface is used restriction strategy, when any one information of three changes, all the renewal of this set of PRB scheduling strategy will be triggered.Situations for using two cover PRB scheduling strategies, need scheduler to consider respectively and integrated treatment it, thus the handling process relative complex of scheduler some; Its advantage is that the cycle based on this base station exports to that resource between the base station of other base stations is used restriction strategy, the resource of other base stations of receiving from X2 interface is used PRB scheduling strategy that restriction strategy generates conventionally to upgrade is long, and the PRB scheduling strategy update cycle of dynamic disturbance Information generation based on each minizone of inside of base station is shorter, is divided into the computation complexity that two parts can reduce PRB scheduling resource.
The implementation method of above-mentioned minizone dynamic interference coordination resource dispatching strategy in each scheduler is as follows:
If there are two kinds of interfaces between a) between eNodeB/eNodeB internal interference harmony messages processing module and scheduler, can carry out interference coordination according to following mode: when for each UE Resources allocation, need to consider that the information such as channel quality (CQI), transfer of data demand, terminal capability of this UE are to guarantee the overall performance of system and the performance of UE, the various PRB scheduling strategies of simultaneously also need to consider between eNodeB/eNodeB internal interference harmony messages processing module output, the reduction that can try one's best in the performance of assurance system, UE is like this disturbed.Now for UE, to carry out the method for resource distribution as follows:
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_CQIdeng the coefficient result of many factors.
B) if between eNodeB/ only have a kind of interface between eNodeB internal interference harmony messages processing module and scheduler, 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_CQIdeng the coefficient result of many factors.
The present invention proposes a kind of interference coordination of LTE system optimization/alleviate scheme, it is minizone dynamic interference coordination, this scheme has considered the mutual feature 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 the method, can alleviate the interference between inner each community of centralized management entity, and alleviate due to information interaction not in time or load information can not well adapt to the phenomenon of the interference mitigation poor effect that the dynamic change of wireless channel environment causes.The method can further alleviate the presence of intercell interference of LTE system, user's service quality in elevator system overall throughput performance and system.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (19)
1. carry out a method for each district dynamic interference coordination of inside of base station, it is characterized in that, the method comprises the following steps:
Obtain this inside of base station interference coordination information, utilize the first scheduling strategy of described inside of base station interference coordination this inside of base station of information acquisition community, described inside of base station interference coordination information comprises: 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;
The first scheduling strategy of described inside of base station community is notified to the scheduler of this inside of base station respective cell;
The scheduler of each community of this inside of base station is dispatched according to the first scheduling strategy of correspondence;
Wherein, according to following steps, obtain each district dynamic interfere information of this inside of base station:
Determine that in each community of inside of base station, the user for presence of intercell interference sensitivity gathers; Estimate in certain hour section that each community of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand; Determine the interference level information on each PRB, and compare with predefined threshold value; According to determining the PRB user demand of Ge community for the terminal of presence of intercell interference sensitivity, and the interference level obtaining is over the PRB information of predefined threshold value, obtains each district dynamic interfere information of inside of base station.
2. method according to claim 1, is characterized in that, the method further comprises:
Utilize the resource between described inside of base station interference coordination information, this base station obtaining and interacting base station to use restriction strategy information, obtain the second scheduling strategy;
The second scheduling strategy is notified to the scheduler of this inside of base station respective cell;
The scheduler of each community of this inside of base station is dispatched according to the first scheduling strategy of correspondence and the second scheduling strategy.
3. method according to claim 1, is characterized in that, the user for presence of intercell interference sensitivity in each community of inside of base station determines according to one or more information:
The information that enters/leave certain cell edge that in community, in each user's information on path loss, community, each user's geometry Geometry distributed intelligence and the A3 event based on LTE standard definition obtain.
4. method according to claim 3, is characterized in that, each user's information on path loss is determined in each community of inside of base station for the user of presence of intercell interference sensitivity according to community, specifically comprises:
By the information on path loss of the terminal of obtaining and predefined threshold T HPL comparison, if the path loss of UE is greater than default threshold T HPL, this terminal is in cell edge, represent to belong to the user of inside of base station presence of intercell interference sensitivity, wherein, according to the power space of this terminal, report PHR information acquisition during the information on path loss of described terminal.
5. method according to claim 3, is characterized in that, each user's information on path loss is determined in each community of inside of base station for the user of presence of intercell interference sensitivity according to community, specifically comprises:
Within a time period, obtain the PHR reporting information of each terminal in community, and based on PHR information, calculate the information on path loss of terminal;
If the path loss of terminal is greater than the path loss values of setting, this terminal is in cell edge.
6. method according to claim 1, is characterized in that, estimates that in certain hour section, each community of inside of base station, for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand, comprising:
The resource number Nused that in acquisition each subframe Zhong， community in time period T, all interference sensitive users are on average used;
Statistics is at the total actual transfer rate SBR of all interference sensitive users in time period T Nei Ge community;
The formula of estimating resource demand is:
r wherein
kfor GBR speed, PBR speed or the minimum bit rate of business, total n the business of all edge customers one.
7. method according to claim 2, is characterized in that, obtains the cycle of this inside of base station interference coordination information, is less than the cycle of the resource use restriction strategy information of obtaining between this base station and interacting base station.
8. method according to claim 2, is characterized in that, the method further comprises:
Utilize the first scheduling strategy and the second scheduling strategy to generate the 3rd scheduling strategy corresponding to each community;
The first scheduling strategy of described inside of base station community is notified to the scheduler of this inside of base station respective cell, and the scheduler of the second scheduling strategy being notified to this inside of base station respective cell, comprising:
The 3rd scheduling strategy corresponding to each community sent to the scheduler of respective cell;
And the scheduler of each community of this inside of base station is dispatched according to the first scheduling strategy of correspondence and the second scheduling strategy, comprising:
The scheduler of each community of this inside of base station carries out resource distribution according to the resource unification of the 3rd scheduling strategy Dui Zhe community of correspondence.
9. method according to claim 2, is characterized in that, the scheduling strategy of described each community of inside of base station is notified to the scheduler of each community, comprising:
Respectively by the scheduler of the first scheduling strategy and the second scheduling strategy notice Gei Ge community, and the announcement period of announcement period community second scheduling strategy of the first scheduling strategy.
10. method according to claim 1 and 2, is characterized in that, the method further comprises:
According to the scheduling strategy of each community of this inside of base station, determine that this base station requires the resource of interacting base station to use restriction strategy information, and require the resource of interacting base station to use restriction strategy information to notify to each interacting base station this base station of determining.
The device of 11. 1 kinds of district dynamic interference coordinations, is characterized in that, this device comprises:
First information acquiring unit, be used for obtaining this inside of base station interference coordination information, described inside of base station interference coordination information comprises: 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;
Scheduling strategy generation unit, utilizes the first scheduling strategy of described each community of inside of base station interference coordination this inside of base station of information acquisition;
Scheduling strategy notification unit, for notifying described the first scheduling strategy the scheduler of respective cell;
Scheduler, for dispatching according to the first scheduling strategy of receiving;
Wherein, described first information acquiring unit obtains each district dynamic interfere information of this inside of base station according to following steps:
Determine that in each community of inside of base station, the user for presence of intercell interference sensitivity gathers; Estimate in certain hour section that each community of inside of base station is for the user's of presence of intercell interference sensitivity Physical Resource Block PRB user demand; Determine the interference level information on each PRB, and compare with predefined threshold value, according to determining the PRB user demand of Ge community for the terminal of presence of intercell interference sensitivity, and the interference level obtaining is over the PRB information of predefined threshold value, obtains each district dynamic interfere information of inside of base station.
12. devices according to claim 11, is characterized in that, this device further comprises:
The second information acquisition unit, is used restriction strategy information for the resource of obtaining between this base station and interacting base station;
Scheduling strategy generation unit, is further used for utilizing the resource between described inside of base station interference coordination information, this base station obtaining and interacting base station to use restriction strategy information, obtains the second scheduling strategy;
Described scheduling strategy notification unit, is further used for the second scheduling strategy to notify the scheduler of this inside of base station respective cell;
Described scheduler, for dispatching according to the first scheduling strategy and second of receiving.
13. devices according to claim 11, is characterized in that, described first information acquiring unit, for determining that according to one or more information each community of inside of base station is for the user of presence of intercell interference sensitivity:
The information that enters/leave certain cell edge that in community, in each user's information on path loss, community, each user's geometry Geometry distributed intelligence and the A3 event based on LTE standard definition obtain.
14. devices according to claim 13, it is characterized in that, described first information acquiring unit, be used for the information on path loss of the terminal of obtaining and predefined threshold T HPL comparison, if the path loss of UE is greater than default threshold T HPL, this terminal, in cell edge, represents to belong to the user of inside of base station presence of intercell interference sensitivity, wherein, according to the power space of this terminal, report PHR information acquisition during the information on path loss of described terminal.
15. devices according to claim 13, is characterized in that, described first information acquiring unit for obtain the PHR reporting information of each terminal in community within a time period, and calculates the information on path loss of terminal based on PHR information; If the path loss of terminal is greater than the path loss values of setting, this terminal is in cell edge.
16. devices according to claim 11, it is characterized in that, described first information acquiring unit, for estimate the Physical Resource Block PRB user demand of each community user of inside of base station in certain hour section according to following steps: obtain the resource number Nused that in each the subframe Zhong， community in time period T, all interference sensitive users are on average used; Statistics is at the total actual transfer rate SBR of all interference sensitive users in time period T Nei Ge community; The formula of estimating resource demand is:
r wherein
kfor GBR speed, PBR speed or the minimum bit rate of business, total n the business of all edge customers one.
17. devices according to claim 12, is characterized in that, described scheduling strategy generation unit is further used for utilizing the first scheduling strategy and the second scheduling strategy to generate the 3rd scheduling strategy corresponding to each community;
Described scheduling strategy notification unit, sends the 3rd scheduling strategy realization for the scheduler by this inside of base station respective cell and the first scheduling strategy and the second scheduling strategy is notified to the scheduler of this inside of base station respective cell;
Described scheduler, for carrying out resource distribution according to the resource unification of the 3rd scheduling strategy Dui Zhe community of correspondence.
18. devices according to claim 12, it is characterized in that, described scheduling strategy notification unit, for respectively by the scheduler of the first scheduling strategy and the second scheduling strategy notice Gei Ge community, and the announcement period of announcement period community second scheduling strategy of the first scheduling strategy.
19. devices according to claim 12, is characterized in that, this device also further comprises:
The 3rd information acquisition unit, for according to the scheduling strategy of each community of this inside of base station, determines that this base station requires the resource of interacting base station to use restriction strategy information;
Described scheduling strategy notification unit, is further used for this base station of determining to require the resource of interacting base station to use restriction strategy information to notify to each interacting base station.
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| CN103634919B (en) * | 2013-12-03 | 2017-01-11 | 北京邮电大学 | Household base station and method for distributing resources for same on basis of interference coordination |
| 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 |
| CN116347452A (en) * | 2021-12-17 | 2023-06-27 | 中兴通讯股份有限公司 | Method, device, server and storage medium for coordinating interference of cells |
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