CN104955157A - Method and device for coordinating inter-cell downlink interference - Google Patents
Method and device for coordinating inter-cell downlink interference Download PDFInfo
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Abstract
The application discloses a method and device for coordinating inter-cell downlink interference. The method includes dividing a preset scheduling period time into N sections as far-point scheduling time section of adjacent cells, scheduling the far-point users of any cell in the system at the far-point scheduling time section of the cell, and scheduling near-point users at the near-point scheduling time section of the cell. Mutual interference between far-point users can be prevented by applying the method and the device.
Description
Technical field
The application relates to the communication technology, particularly a kind of method and apparatus of inter-cell downlink interference coordination.
Background technology
In the system of identical networking, adjacent area interference is the key factor of influential system throughput.In identical networking scene, existing interference cancellation techniques is mainly realized by frequency domain ICIC.Particularly, region, microzonation branch center and fringe region, differentiation scheduling is carried out respectively by the center frequency-band divided and edge band in central area and fringe region, use center frequency-band to dispatch for the near point user being positioned at central area in community, use edge band to dispatch for the far point user being positioned at fringe region in community; Meanwhile, plan that the edge band realizing neighbor cell does not conflict by networking.By the way, the far point user of neighbor cell will use different frequency bands to dispatch, and can avoid the mutual interference between the far point user of adjacent area.The interference coordination mode of above-mentioned frequency domain ICIC, the system larger to system bandwidth, really effectively, but in the such little bandwidth system of 1.4M or 3M, carries out interference coordination by frequency domain just very undesirable.
Particularly, in the community of 3M or 1.4M, PDCCH resource is rare., usually there is the deficiency due to CCE, cause interface-free resources to be not fully utilized in special subframe of simultaneously dispatching up-downgoing at those.According to the method that frequency domain interference is coordinated, TTI at least will dispatch near point and far point two users just can make full use of interface-free resources.Need to dispatch in the subframe of up-downgoing at those, uplink scheduling will can not get scheduling owing to lacking CCE simultaneously.The chance being in the uplink user acquisition scheduling of far-end is less, this directly may cause this user because up nothing is authorized and discharges, therefore cannot ensure that a TTI at least will dispatch near point and far point two users, also just cannot ensure to make full use of interface-free resources, and cause in band-limited system bandwidth resources by serious waste.
Further, utilize the method for frequency domain ICIC to carry out inter-cell coordination, the interface-free resources that each user can dispatch is limited, in order to meet the requirement of QoS, must increase the scheduling times of unique user; The increase of scheduling times, directly increases the demand to PDCCH resource, causes the minimizing of the passed data volume of PDSCH.This, for the inherently rare little bandwidth system of PDSCH resource, is insufferable.
From above-mentioned, in little bandwidth system, the rare numbers of CCE, easily there is mutual interference in the CCE resource of the far point user of neighbor cell, this interference is difficult to solve in little bandwidth system.In addition, in little bandwidth, normal use alleviates the deficiency of CCE, the lifting of CCE power by the technology of bring to power reduction aggregation levels, further increases and causes the possible of interference to facing district far point user CCE.Therefore, it is unpractical for coordinating to reduce presence of intercell interference for little bandwidth by frequency domain.
Summary of the invention
The application provides a kind of method and apparatus of inter-cell downlink interference coordination, effectively can reduce the interference of minizone in little bandwidth system.
For achieving the above object, the application adopts following technical scheme:
A method for inter-cell downlink interference coordination, comprising:
In advance time dispatching cycle of setting is carried out segmentation, distribute to system Zhong Ge community as its far point scheduling time section; Wherein, the far point scheduling time section of every two neighbor cells is different;
For the arbitrary community in system, in the far point scheduling time section of this community, dispatch the far point user of this community; In the near point scheduling time section of this community, only dispatch the near point user of this community;
Wherein, the near point scheduling time section of community is the time outside the far point scheduling time section of described time dispatching cycle Nei Chugai community.
Preferably, in the far point scheduling time section of described arbitrary community, if the far point user scheduling of this community is complete and there is residue scheduling resource, then continue the near point user of this community do not dispatched.
Preferably, the number of described segmentation is determined according to the number of neighbor cell in system.
Preferably, according to community, the degree of protection of far point user rate, the maximum rate of far point user and/or throughput are determined to the length of the far point scheduling time section of this community.
Preferably, the frame number of described system and subframe numbers carry out synchronously, and the current scheduling Transmission Time Interval TTI according to frame number and subframe numbers calculation plot belongs to far point scheduling time section or near point scheduling time section.
An equipment for inter-cell downlink interference coordination, comprising: memory cell, decision unit, scheduling unit;
Described memory cell, for preserving the far point scheduling time section of time dispatching cycle and this community; Wherein, the far point scheduling time section of this community described is: one of them time period produce after time slice described dispatching cycle, and the far point scheduling time section difference in system between every two neighbor cells;
Described decision unit, for the far point scheduling time section according to time dispatching cycle of preserving and this community, determines that current scheduling Transmission Time Interval TTI belongs to far point scheduling time section or near point scheduling time section, and notifies described scheduling unit;
Described scheduling unit, for the far point scheduling time section in this community, dispatches the far point user of this community; Also for the near point scheduling time section in this community, only dispatch the near point user of this community; Wherein, near point scheduling time section is the time outside the far point scheduling time section of described time dispatching cycle Nei Chuzhe community.
As seen from the above technical solution, in the application, in advance time dispatching cycle of setting is carried out segmentation, distribute to system Zhong Ge community as its far point scheduling time section; For the arbitrary community in system, in the far point scheduling time section of this community, dispatch the far point user of this community; In the near point scheduling time section of this community, only dispatch the near point user of this community.By the way, the far point scheduling time section of dispatching far point user between every two neighbor cells in system is different, thus avoid the mutual interference between far point user, and ensure that far point user and near point user can use Whole frequency band resource, avoid the waste of band resource.
Accompanying drawing explanation
Fig. 1 is the exemplary plot of the far point scheduling time section of distributing community in the application;
Fig. 2 is the method flow schematic diagram of downlink interference collaboration between the application small area;
Fig. 3 is the device structure schematic diagram of downlink interference collaboration between the application small area.
Embodiment
In order to make the object of the application, technological means and advantage clearly understand, below in conjunction with accompanying drawing, the application is described in further details.
For little bandwidth system, band resource is very limited and preciousness, and therefore, the application, when carrying out inter-cell downlink interference coordination, does not carry out multiplexing at frequency band, but the mutual interference between the multiplexing far point user avoiding neighbor cell utilizing time domain.
Based on this, the basic thought of the application is: the far point user of respective community is dispatched in the different time periods in neighbor cell, non-interfering object between the far point user reaching neighbor cell.
Particularly, between the application small area, the method overall process of downlink interference collaboration comprises:
Step 1, carries out segmentation by time dispatching cycle of setting in advance, distributes to system Zhong Ge community as its far point scheduling time section.
First, configuration scheduling cycle time, the time-domain resource being about to scheduling divided according to the cycle, the duration in each cycle is time dispatching cycle, and this time dispatching cycle can be continuous print some time section sum (such as some continuous subframes sums) or discrete some time section sum (such as discrete some subframe sums).Be no matter continuous print or discrete, total duration of time dispatching cycle is identical.
Then, time dispatching cycle is divided into N section, distributes to system Zhong Ge community as its far point scheduling time section.Each time period after segmentation can be the continuous print time, also can be discrete.N is the division number determined according to the number of neighbor cell in system.Wherein, after time dispatching cycle is carried out segmentation, for a time period is chosen as its far point scheduling time section in each community, each time period can distribute to multiple community, but will ensure that the far point scheduling time section of every two neighbor cells is different.For a simple example, as shown in Figure 1, in the system of cellular cell, neighbor cell quantity is 6, time dispatching cycle can be divided into 3 sections, represent with label 1,2,3 respectively, carry out the distribution of far point scheduling time section according to the mode of Fig. 1, the far point scheduling time section that can realize every two neighbor cells is different.Wherein, the label in community represents the far point scheduling time section that this community is assigned with.
In more detail, when time dispatching cycle is divided into N section, the length of the far point scheduling time section of this community can be determined to the degree of protection of far point user rate, the maximum rate of far point user and/or throughput according to each community.
Step 2, for arbitrary community, in the far point scheduling time section of this community, dispatches the far point user of this community; In the near point scheduling time section of this community, only dispatch the near point user of this community.
In arbitrary community in systems in which, near point scheduling time section is all the other times outside the far point scheduling time section of time dispatching cycle Nei Chugai community, the namely set of the far point scheduling time section of all neighbor cells of this community or its superset.
After determining far point scheduling time section and near point scheduling time section, near point scheduling time section, only carry out the scheduling of the near point user of this community, and do not dispatch the far point user of this community.Due to set or its superset of the far point scheduling time section of all neighbor cells of near point scheduling time Duan Weiqi of this community, therefore, the far point user of this community is not dispatched near point scheduling time section, just mean the far point scheduling time section of all neighbor cells in this community, all can not dispatch the far point user of this community, thus avoid the far point user of neighbor cell to dispatch in same time section, that is the far point user of neighbor cell dispatched in the mutually different time.This mode can avoid the mutual interference between far point user.
In far point scheduling time section, carry out the scheduling of the far point user of this community.Due in neighbor cell, dispatch respective near point user simultaneously and substantially can not cause mutual interference, therefore, in far point scheduling time section, after far point user scheduling, if also there is residue scheduling resource, preferably, the near point user dispatching this community can be continued.
So far, the group method of the Inter-Cell Interference Coordination in the application terminates.
In above-mentioned disturbance coordination method, time dispatching cycle and the far point scheduling time section of setting can in units of subframes, the frame number of system whole-network and subframe numbers are carried out synchronously, next, just can according to current frame number and subframe numbers, calculate community current scheduling Transmission Time Interval (TTI) whether to belong to far point scheduling time section or belong near point scheduling time section, thus determine the scheduling strategy of current scheduling TTI.Wherein, the subframe belonging to far point scheduling time section can be called far point subframe, the subframe belonging near point scheduling time section is called near point subframe.Provide the object lesson of an Inter-Cell Interference Coordination below as example, specifically as shown in Figure 2, comprising:
Step 201, calculates current transmission time interval (TTI) by frame number and subframe numbers and belongs to time dispatching cycle.
As previously mentioned, time dispatching cycle is the cycle that the time-domain resource of scheduling marks off, and some TTI may not belong to the time-domain resource of scheduling, then do not need to carry out interference coordination process according to the mode of the application.In this step, according to time dispatching cycle of preserving, determining that current TTI belongs to the time period of scheduling by calculating, being scheduling TTI, thus carrying out interference coordination process according to follow-up mode.
Step 202, judges whether current TTI is near point subframe, if so, then performs step 206, otherwise, perform step 203.
Whether be near point subframe according to frame number and subframe numbers determination current TTI, namely belong to the near point scheduling time section of this community, if so, perform step 206, only carry out the near point user scheduling of this community, do not dispatch far point user.If not, then current TTI belongs to far point subframe, performs step 203.
The scheduling of this community far point user is carried out in following steps 203 ~ 205.
Step 203, obtains the far point user scheduling queue of this community.
Step 204, the far point user in the queue of scheduling far point user scheduling.
Because the far point subframe of neighbor cell is different, the far point user scheduling therefore carried out in far point subframe can realize not interfereing with each other.
Step 205, judges whether the user in the queue of far point user scheduling dispatches complete, if not, then returns step 204, dispatch next far point user, if so, then when still there is residue scheduling resource, performs step 206.
Step 206, near point, user dispatches.
In this step, to the opportunity that near point user dispatches, both may be near point subframe, and also may be far point subframe, thus make full use of scheduling time-domain resource as much as possible.
So far, the method flow in this example terminates.
The above-mentioned specific implementation being disturbance coordination method in the application.Present invention also provides a kind of equipment of Inter-Cell Interference Coordination, can be arranged in the equipment such as base station, for implementing above-mentioned disturbance coordination method.Fig. 3 is the basic structure schematic diagram of interference coordination equipment in the application.As shown in Figure 3, this equipment comprises: memory cell, decision unit and scheduling unit.
Wherein, memory cell, for preserving the far point scheduling time section of time dispatching cycle and this community.Decision unit, for the far point scheduling time section according to time dispatching cycle of preserving and this community, determines that current scheduling TTI belongs to far point scheduling time section or near point scheduling time section, and notifies scheduling unit.Scheduling unit, for the far point scheduling time section in this community, dispatches the far point user of this community; Also for the near point scheduling time section in this community, only dispatch the near point user of this community.Particularly, the far point scheduling time section of this community is: to one of them time period produced after scheduling segmentation cycle time, and in system, the far point scheduling time section of every two neighbor cells is different.Near point scheduling time section is the time outside the far point scheduling time section of time dispatching cycle Nei Chuzhe community.
By the process of above-mentioned the application, utilize and distinguish the scheduling that the time period carries out far point and near point user, avoid in the system of identical networking, appear at the scene that identical TTI dispatches far point user, avoid far point user interference to each other.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. a method for inter-cell downlink interference coordination, is characterized in that, comprising:
In advance time dispatching cycle of setting is carried out segmentation, distribute to system Zhong Ge community as its far point scheduling time section; Wherein, the far point scheduling time section of every two neighbor cells is different;
For the arbitrary community in system, in the far point scheduling time section of this community, dispatch the far point user of this community; In the near point scheduling time section of this community, only dispatch the near point user of this community;
Wherein, the near point scheduling time section of community is the time outside the far point scheduling time section of described time dispatching cycle Nei Chugai community.
2. method according to claim 1, is characterized in that, in the far point scheduling time section of described arbitrary community, if the far point user scheduling of this community is complete and there is residue scheduling resource, then continues the near point user of this community do not dispatched.
3. method according to claim 1, is characterized in that, determines the number of described segmentation according to the number of neighbor cell in system.
4. method according to claim 1, is characterized in that, according to community, the degree of protection of far point user rate, the maximum rate of far point user and/or throughput is determined to the length of the far point scheduling time section of this community.
5. method according to claim 1, is characterized in that, the frame number of described system and subframe numbers carry out synchronously, and the current scheduling Transmission Time Interval TTI according to frame number and subframe numbers calculation plot belongs to far point scheduling time section or near point scheduling time section.
6. an equipment for inter-cell downlink interference coordination, is characterized in that, comprising: memory cell, decision unit, scheduling unit;
Described memory cell, for preserving the far point scheduling time section of time dispatching cycle and this community; Wherein, the far point scheduling time section of this community described is: one of them time period produce after time slice described dispatching cycle, and the far point scheduling time section difference in system between every two neighbor cells;
Described decision unit, for the far point scheduling time section according to time dispatching cycle of preserving and this community, determines that current scheduling Transmission Time Interval TTI belongs to far point scheduling time section or near point scheduling time section, and notifies described scheduling unit;
Described scheduling unit, for the far point scheduling time section in this community, dispatches the far point user of this community; Also for the near point scheduling time section in this community, only dispatch the near point user of this community; Wherein, near point scheduling time section is the time outside the far point scheduling time section of described time dispatching cycle Nei Chuzhe community.
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| CN112449414A (en) * | 2019-08-30 | 2021-03-05 | 上海华为技术有限公司 | Transmission power distribution method, network equipment and storage medium |
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