CN102821388A - Method and device for inhibiting inter-cell interference (ICI) - Google Patents

Abstract

The invention provides a method and a device for inhibiting the ICI. The method includes judging an enabled state of null forming (NF) of a cell on the condition that an enabled state of inter-cell interference coordination (ICIC) in the cell is confirmed; when the ICIC and the NF are enabled or the NF is enabled, judging whether NF conditions between the cell and an adjacent cell are met, if the conditions are met, the ICI is inhabited by an NF operation; and if the conditions are not met, the ICI is inhabited by a beam forming NF operation. The technical scheme solves problems that scheduling cannot be effectively performed to two scheduling strategies, benefits brought by the two scheduling strategies are affected and the like because that resource allocation modes of the ICIC and the NF are collided in relevant technologies, further the effect of two modes of scheduling of the ICIC and the NF is achieved, and the benefits brought by the two scheduling strategies are effectively achieved.

Description

Inter-cell interference ICI suppressing method and device

Technical field

The present invention relates to the communications field, in particular to a kind of inter-cell interference ICI suppressing method and device.

Background technology

The heart and cell edge have very big difference to the data transfer rate that existing cell mobile communication systems is provided in the cell, not only have impact on the capacity of whole system, and user is had very big fluctuation in the service quality that different positions is obtained.Therefore, the new generation broadband wireless communication system being currently in development, all will coincidentally improve cell-edge performance and is used as one of main demand parameter.

Inter-cell interference (Inter-Cell Interference, referred to as ICI) is an intrinsic problem of cell mobile communication systems, and traditional solution is to use channeling, and multiplexing coefficient only has specific several selections, such as 1,3,7.It is multiplexed coefficient and is equal to 1 i.e. neighbor cell all using identical frequency resource, it is at this moment very serious in the interference of cell edge.Relatively low multiplexing coefficient (3 or 7) can effectively suppress ICI, but spectrum efficiency will be reduced to 1/3 or 1/7.Requirement of following wide-band mobile communication system to spectrum efficiency is very high, and it is desirable to close to spectrum reuse coefficient 1.OFDM (Orthogonal Frequency Division Multiplexing, referred to as OFDM) technology is than CDMA (Code-Division Multiple Access, referred to as CDMA) technology is the problem of preferably solve intra-cell interference, but the ICI problems that ofdm system is brought may be more serious than cdma system.If two neighbor cells use identical frequency spectrum resource in their joint portion, stronger ICI can be produced.

The inter-cell interference suppression technology that early stage is considered mainly includes inter-cell interference randomization, inter-cell interference cancellation, Inter-Cell Interference Coordination/avoidance and uses beam-shaped antenna technology in base station.It should be noted that the relation that above-mentioned various interference mitigation technologies are not necessarily substituted for each other, and can largely use cooperatively, obtain more preferable effect.The general principle of wherein Inter-Cell Interference Coordination/avoidance is that downlink resource is managed to set certain limitation, to coordinate the action of multiple cells, it is to avoid produce serious inter-cell interference.This limitation is the limitation to transmission power in scheduling of resource and resource block.And the wave beam of beam-shaped antenna is directed to UE narrow beam, inter-cell interference can be effectively avoided when wave beam interlocks, and inter-cell interference only can be just caused when the wave beam of neighbor cell collides.When the wave beam of neighbor cell collides, at present using null (Null Beamforming, referred to as NF) mode come suppress interference, NF is by up obtained wave beam forming (Beamforming, BF) or NF antenna weights, figuration is carried out using the value so that suppress the reception to interference as far as possible, strengthen the reception to useful signal in downstream.

According to Inter-Cell Interference Coordination (Inter-Cell Interference Coordination, referred to as ICIC) it can be seen that with NF general principle, the former is to avoid interference, do not dispatch on the same resource block, and the latter is to be scheduled interference correspondence on identical running time-frequency resource, but both technologies can efficiently solve ICI, certain difficulty is then brought to scheduling strategy.This resource allocation contradiction how is efficiently solved, is the problem of needing to solve without the gain for influenceing this two methods to be brought in itself.

For the above mentioned problem in correlation technique, effective solution is not yet proposed at present.

The content of the invention

It is a primary object of the present invention to provide the suppressing method and device of a kind of inter-cell interference (ICI), at least one to solve the above problems.

According to an aspect of the invention, there is provided a kind of suppressing method of inter-cell interference (ICI), including：It is determined that local area Inter-Cell Interference Coordination (ICIC) enabled state in the case of, judge the enabled state of the null (NF) of local area；When ICIC and NF are enabled or NF is enabled, judge NF conditions whether are met between local area and adjacent area, if it is satisfied, then the suppression for carrying out ICI is operated using NF, if be unsatisfactory for, using wave beam forming BF operation progress ICI suppression.

The above method also includes：The ICIC and the NF resource distribution mode are pre-set, wherein, the resource distribution mode includes one below：Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+BF frequency ranges of each adjacent area stagger on frequency domain, have that the edge UE+NF frequency ranges of at most one adjacent area are corresponding with the edge UE+BF frequency ranges of local area in the adjacent area, the remaining frequency range of the local area and adjacent area is divided still according to ICIC frequency range dividing mode；Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+NF frequency ranges of each cell concentrate on identical interval on frequency domain, and the remaining frequency range of local area and adjacent area is divided still according to ICIC frequency range dividing mode；The frequency range dividing mode that ICIC is continued to use in local area and adjacent area is divided.

After using NF operations, in addition to：Judge user equipment (User Equipment, referred to as UE) to whether meeting NF pairing conditions；If it is satisfied, then according to the index specified of monitoring, judging whether to meet NF exit criterias, if met, NF operations are then exited, if be unsatisfactory for, continue NF operations, wherein, index is used to indicate the degree that UE centerings UE is disturbed, and NF pairing conditions are used for the UE for indicating UE centerings if appropriate for NF.

It is above-mentioned judge UE to whether meet NF pairing condition, including：Determine the angle for the angle that the UE of local area and the UE of adjacent area are made up of using base station summit；When angle is in default angular range, then NF pairing conditions are met, otherwise, be unsatisfactory for NF pairing conditions.

It is above-mentioned to judge NF conditions whether are met between local area and adjacent area, including：Judge whether to meet NF conditions according to local area narrow emission power RNTP related to adjacent area combined information, wherein, combined information is used to indicate whether local area and/or adjacent area have RNTP instructions, when there are RNTP instructions local area and adjacent area, NF conditions are then met, otherwise, NF conditions are unsatisfactory for.

It is above-mentioned to judge NF conditions whether are met between local area and adjacent area, including：Using the first predetermined threshold value RNTP_thr1Judge the related narrow emission power RNTP of local area and RNTP instructions are carried out to adjacent area, wherein, using the first predetermined threshold value RNTP_thr1In deterministic process, if the smooth value RSRQ calculated is unsatisfactory for requiring, then it is assumed that adjacent area carries out drop power to local area it cannot be guaranteed that local area UE；Adjacent area is notified to use the second predetermined threshold value RNTP in the corresponding frequency range of this area edge frequency range_thr2RNTP drop threshold processings are carried out, judge whether adjacent area there are RNTP instructions again；When there are RNTP instructions in local area and adjacent area, then NF conditions are met, otherwise, be unsatisfactory for NF conditions.

After ICI suppression is carried out using NF operations or BF operations, in addition to：NF/BF figurations are carried out in up calculating NF or BF weights, and to the corresponding band downlink of weights.

According to another aspect of the present invention there is provided a kind of inter-cell interference (ICI) restraining device, including：Determining module, the enabled state of the Inter-Cell Interference Coordination (ICIC) for determining local area；First judge module, the enabled state of the null NF in the case of ICIC enabled state, judging local area；Second judge module, for when ICIC and NF is enabled or NF is enabled, judging NF conditions whether are met between local area and adjacent area；Performing module, in the case of being in the second judge module output result, the suppression for carrying out ICI is operated using NF, and in the case where the second judge module output result is no, the suppression for carrying out ICI is operated using wave beam forming BF.

Said apparatus also includes：Resource distribution module, the resource distribution mode for pre-setting the ICIC and the NF, wherein, the resource distribution mode includes one below：Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+BF frequency ranges of each adjacent area stagger on frequency domain, have that the edge UE+NF frequency ranges of at most one adjacent area are corresponding with the edge UE+BF frequency ranges of local area in the adjacent area, the remaining frequency range of the local area and adjacent area is divided still according to ICIC frequency range dividing mode；Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+NF frequency ranges of each cell concentrate on identical interval on frequency domain, and the remaining frequency range of local area and adjacent area is divided still according to ICIC frequency range dividing mode；The frequency range dividing mode that ICIC is continued to use in local area and adjacent area is divided.

Said apparatus also includes：3rd judge module, for after using NF operations, judging user equipment (UE) to whether meeting NF pairing conditions, wherein, NF pairing conditions are used for the UE for indicating UE centerings if appropriate for NF；4th judge module, in the case of being in the 3rd judge module output result, judges whether to meet NF exit criterias according to the index specified of monitoring, if met, performing module is then notified to exit NF operations, wherein, index is used to indicate the degree that UE is disturbed.

Above-mentioned second judge module, for judging whether to meet NF conditions according to local area narrow emission power RNTP related to adjacent area combined information, wherein, combined information is used to indicate whether local area and/or adjacent area have RNTP instructions, when there are RNTP instructions local area and adjacent area, NF conditions are then met, otherwise, NF conditions are unsatisfactory for.

Above-mentioned second judge module, for being judged whether to meet NF conditions according in the following manner：The related narrow emission power RNTP of local area uses the first predetermined threshold value RNTP_thr1Judge and RNTP instructions are carried out to adjacent area, wherein, using the first predetermined threshold value RNTP_thr1In deterministic process, if the smooth value RSRQ calculated is unsatisfactory for requiring, then it is assumed that adjacent area carries out drop power to local area it cannot be guaranteed that local area UE；Adjacent area is notified to use the second predetermined threshold value RNTP in the corresponding frequency range of this area edge frequency range_thr2RNTP drop threshold processings are carried out, judge whether adjacent area there are RNTP instructions again；If there are RNTP instructions in local area and adjacent area, NF conditions are met, otherwise, NF conditions are unsatisfactory for.

Pass through the present invention, using on ICIC basis, the technological means being scheduled to NF and ICIC, solve in correlation technique because ICIC mutually conflicts with NF resource distribution mode, effectively two kinds of scheduling strategies can not be scheduled, the problems such as gain that influence above two strategy is brought, so as to reach the effect realized and dispatched to NF and ICIC two ways, and then effectively realize the effect for the gain that above two method is brought.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and schematic description and description of the invention is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the flow chart of the suppressing method of the inter-cell interference (ICI) according to the embodiment of the present invention；

Fig. 2 is the schematic flow sheet of the enabled state for judging ICIC+NF according to the preferred embodiment of the present invention；

Fig. 3 is the schematic flow sheet of the suppressing method of the ICI according to present example 1；

Fig. 4 is the ICIC+NF resource static configuration figures according to present example 5；

Fig. 5 is the schematic flow sheet for judging NF/BF according to present example 5；

Fig. 6 be kept according to the NF of present example 5/exit schematic flow sheet；

Fig. 7 is another ICIC+NF resource static configuration figure according to present example 5；

Fig. 8 is the static ICIC+NF resource distributions figure according to present example 6；

Fig. 9 is the judgement NF/BF schematic flow sheets according to present example 6；

Figure 10 be kept according to the NF of present example 6/exit schematic flow sheet；

Figure 11 is the ICIC+NF static configuration figures according to present example 7；

Figure 12 is the NF/BF flow charts according to present example 7；

Figure 13 is the structured flowchart of the restraining device of the inter-cell interference ICI according to the embodiment of the present invention；

Figure 14 is the structural representation of the restraining device of the inter-cell interference ICI according to the preferred embodiment of the present invention.

Embodiment

Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.

Fig. 1 is the flow chart of the suppressing method of the ICI according to the embodiment of the present invention.As shown in figure 1, this method includes：

Step S102, it is determined that local area ICIC enabled state in the case of, judge the NF of local area enabled state；

In a preferred embodiment of the invention, as shown in Fig. 2 judging the flow of ICIC+NF enabled state includes following processing procedure：

Step S202, judges whether the ICIC of local area enables (judging that ICIC is opening or closing), if it is, into step S204；If not, into step S210；

Step S204, judges whether NF enables, if enabled, goes to step S206, if do not enabled, goes to step S208；

Step S206, operates branch into ICIC+NF, goes to step S214；

Step S208, operates branch into ICIC, goes to step S214；

Step S210, judges whether NF enables, if enabled, goes to step S212, if do not enabled, goes to step S214；

Step S212, operates branch into NF, goes to step S214；

Step S214, terminates.

Step S104, when ICIC and NF is enabled or NF is enabled, judges NF conditions whether are met between local area and adjacent area, if it is satisfied, then the suppression for carrying out ICI is operated using NF, if be unsatisfactory for, using wave beam forming BF operation progress ICI suppression.

Above-described embodiment is used on ICIC basis, the technological means being scheduled to NF and ICIC, solve in correlation technique because ICIC mutually conflicts with NF resource distribution mode, effectively two kinds of scheduling strategies can not be scheduled, the problems such as gain that influence above two strategy is brought, the effect dispatched to NF and ICIC two ways is realized so as to reach, and then effectively realizes the effect for the gain that above two method is brought.

During concrete application, the above method also includes：The ICIC and the NF resource distribution mode are pre-set, wherein, the resource distribution mode includes one below：Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+BF frequency ranges of each adjacent area stagger on frequency domain, have that the edge UE+NF frequency ranges of at most one adjacent area are corresponding with the edge UE+BF frequency ranges of local area in the adjacent area, the remaining frequency range of the local area and adjacent area is divided still according to ICIC frequency range dividing mode；Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+NF frequency ranges of each cell concentrate on that identical on frequency domain is interval, and the remaining frequency range of local area and adjacent area is divided still according to ICIC frequency range dividing mode；The frequency range dividing mode that ICIC is continued to use in local area and adjacent area is divided.

It should be noted that oneself being local area for each cell, remaining neighbor cell is all adjacent area.For a cell, each cell refers to itself and its all adjacent areas；The remaining frequency range of each cell is the center bin of each cell.

It should be noted that ICIC frequency range dividing mode is known.Frequency range is divided into center bin and edge frequency range by i.e. each cell, and the edge frequency range of all cells staggers, for the edge frequency range of each cell, and the center bin of remaining all adjacent area all corresponds to the edge frequency range of local area.

During concrete application, following processing procedure can also be included：Judge user equipment (UE) to whether meeting NF pairing conditions；If it is satisfied, then according to the index specified of monitoring, judging whether to meet NF exit criterias, if met, NF operations are then exited, if be unsatisfactory for, continue NF operations, wherein, index is used to indicate the degree that UE centerings UE is disturbed, and NF pairing conditions are used for the UE for indicating UE centerings if appropriate for NF.Above-mentioned processing procedure can be carried out being operated using NF.In the specific implementation, after NF is matched, the lifting with RSRQ performances or the UE with centering cause the UE to carry out NF due to the mobile or channel condition reason such as improve, then need to carry out independent RSRQ to the UE again to judge, resource allocation is re-started, NF/BF is re-started and judges flow.

During concrete application, it is above-mentioned judge UE to whether meet NF pairing condition, including：Determine the angle for the angle that the UE of local area and the UE of adjacent area are made up of using base station summit；When angle is in default angular range, then NF pairing conditions are met, otherwise, be unsatisfactory for NF pairing conditions.

It is above-mentioned to judge NF conditions whether are met between local area and adjacent area during concrete application, it can include：Judge whether to meet NF conditions according to local area narrow emission power RNTP related to adjacent area combined information, wherein, combined information is used to indicate whether local area and/or adjacent area have RNTP instructions, when there are RNTP instructions local area and adjacent area, NF conditions are then met, otherwise, NF conditions are unsatisfactory for.So, it just can judge whether to meet NF conditions using RNTP relevant information, it is convenient to carry out.Certainly, in the specific implementation, however it is not limited to judged using RNTP, it can also be judged according to actual conditions using other indexs.

During concrete application, as mentioned above, however it is not limited to judged using RNTP, it would however also be possible to employ other manner is judged, specific as follows：It is above-mentioned to judge NF conditions whether are met between local area and adjacent area, including：Using the first predetermined threshold value RNTP_thr1Judge the related narrow emission power RNTP of local area and RNTP instructions are carried out to adjacent area, wherein, using the first predetermined threshold value RNTP_thr1In deterministic process, if the smooth value RSRQ calculated is unsatisfactory for requiring, then it is assumed that adjacent area carries out drop power to local area it cannot be guaranteed that local area UE；Adjacent area is notified to use the second predetermined threshold value RNTP in the corresponding frequency range of this area edge frequency range_thr2RNTP drop threshold processings are carried out, judge whether adjacent area there are RNTP instructions again；When there are RNTP instructions in local area and adjacent area, then NF conditions are met, otherwise, be unsatisfactory for NF conditions.

During concrete application, after ICI suppression is carried out using NF operations or BF operations, following processing procedure can also be included：NF/BF figurations are carried out in up calculating NF or BF weights, and to the corresponding band downlink of weights.

In order to more fully understand above-described embodiment, described in detail below in conjunction with relevant drawings and instantiation.

Example 1

This example is in order to solve ICI resource allocation problem, the ICIC for ICI and the method for the resource allocation of NF coordinated schedulings proposed, this method is on ICIC basis, NF carries out resource reallocation or does not carry out resource allocation individually, and when NF enable/is not enabled, ICIC exclusive use is not influenceed.

As shown in figure 3, the ICI of this example suppressing method specifically includes following steps：

Step S302, judges that ICIC, NF of local area enable (switch) state, and into corresponding operation branch, specific deterministic process refers to the flow shown in Fig. 2.

Step S304, if what is entered branches into NF operations or ICIC+NF operations, needs to judge NF condition whether is met between local area and adjacent area, NF patterns is entered if meeting, if it is not satisfied, then entering BF patterns.

Step S306, in NF patterns, judges whether to meet NF pairing conditions, judge for example according to whether the angle of the UE of local area and the UE of the adjacent area angle being made up of using base station summit meets predetermined angle scope, if falling into angular range, then it is assumed that meet NF pairing conditions, otherwise, it is unsatisfactory for.

Step S308, if be in NF patterns and meet NF pairing conditions, monitors the index (degree that index expression UE is disturbed) specified, judges whether NF meets exit criteria, NF patterns are exited if meeting, if it is not satisfied, then keeping NF.

Step S310, NF/BF figurations are carried out in the corresponding band downlink of up calculating NF/BF weights.

Example 2

This example is mainly to gather the UE for needing most protection to be staggered from needing most the UE of protection in adjacent area and being integrated into different frequency ranges; frequency range for needing most protection in this cell; local area is protected in different adjacent areas by dropping power or carrying out NF two ways to this cell, and the UE of this cell carries out BF to itself.Previously known of adjacent area cell is by the configuration information of protection frequency range.Comprise the following steps that：

Step 1：Initial setting up.

1) Sounding Reference Signal (Sounding Reference Signal, referred to as SRS) of NF frequency ranges is configured according to the setting of permission, and shared with neighboring BS information, without transmitting interactive information by X2 interface.Configure the maximum number of user upper limit of NF frequency ranges.

2) order of severity that UE is disturbed is judged using the information of Reference Signal Received Quality (Reference Signal Received Quality, referred to as RSRQ).

3) edge frequency range improves power, center bin reduction power.

4) UE of each cell distinguishes edge UE and center UE according to Reference Signal Received Power (Reference Signal Received Power, referred to as RSRP).

5) by whole frequency range be divided into center bin, edge+NF frequency ranges, edge+BF frequency ranges resource distribution.

It is provided with center bin and edge+NF frequency range of the method for configuration for the edge+BF frequency ranges correspondence adjacent area of each cell, at most 1 edge+BF frequency range of each cell, edge+NF the frequency ranges for having a cell in its adjacent area are corresponded to therewith, and frequency range is corresponded to therewith centered on remaining frequency range.

6) when ICIC is not enabled, only NF is enabled.

When ICIC is not enabled, the frequency range divided in advance still retains, and SRS configuration information is also required to retain, its resource distribution by the 5) edge+NF frequency ranges of point make center bin into and use.This cell will be disturbed more UE distribution in edge+BF frequency ranges, and the setting of other frequency ranges keeps constant.

Step 2：Judge ICIC, NF enabled state, into corresponding operation branch, specifically refer to flow shown in Fig. 2.

Step 3：UE carries out resource allocation according to the edge/hub attribute of itself and RSRQ information.

Step 4：Judged the UE of edge+NF frequency ranges if appropriate for progress NF operations according to the relevant information between the combined information of the related narrow emission power (Relative Narrowband TX Power, referred to as RNTP) of each cell and UE pairs.If meeting NF conditions, enter NF operations；If it is not satisfied, then carrying out BF operations.

Step 5：After NF is matched, lifting with RSRQ performances or the UE with centering cause the UE to carry out NF due to the mobile or channel condition reason such as improve, then need again to carry out the UE independent RSRQ judgements, re-start resource allocation, re-start NF/BF and judge flow.

Step 6：NF/BF figurations are carried out in the corresponding band downlink of up calculating NF/BF weights.

Example 3

This example, which is mainly, distributes the UE for the needing most protection UE set gathered with needing most protection in adjacent area in identical frequency range, and NF protections are carried out each other, and remaining frequency range follows ICIC rules.Previously known of adjacent area cell is by the configuration information of protection frequency range.Comprise the following steps that：

Step 1：Initial setting up.

1) NF frequency ranges are individually divided, the corresponding NF frequency ranges of each cell are identical, remaining part keeps ICIC frequency range to divide, and the SRS of NF frequency ranges is configured according to the setting of permission, and it is shared with neighboring BS information, without transmitting interactive information by X2 interface.F₃Frequency range allow maximum UE number be

2) order of severity that UE is disturbed is judged using RSRQ information.

3) edge frequency range improves power, center bin reduction power.

4) UE of each cell distinguishes edge UE and center UE according to RSRP.

5) when ICIC enables, when NF is not enabled.The all center bins of NF frequency ranges that each cell is individually divided.

Step 2：Judge ICIC, NF enabled state, operate branch into corresponding, as shown in Figure 2.

Step 3：UE carries out resource allocation according to the edge/hub attribute of itself and RSRQ information.

Step 4：If appropriate for progress NF operations between UE pairs according to the relevant information between the combined information of the related narrow emission power (Relative Narrowband TX Power, referred to as RNTP) of each cell and UE pairs to judge edge+NF frequency ranges.If meeting NF conditions, enter NF operations；If it is not satisfied, then carrying out BF operations.

Step 5：After NF is matched, lifting with RSRQ performances or the UE with centering cause the UE to carry out NF due to the mobile or channel condition reason such as improve, then need again to carry out the UE independent RSRQ judgements, re-start resource allocation, re-start NF/BF and judge flow.

Step 6：NF/BF figurations are carried out in the corresponding band downlink of up calculating NF/BF weights.

Example 4

This example changes the protected mode in edge frequency range on the basis of individually increase NF frequency ranges are not divided, only, indicates that adjacent area carries out drop power+NF duplicate protection mode when drop power, which can not be met, to be required, then by RNTP.Comprise the following steps that：

Step 1：Initial setting up.

1) frequency range is divided into center bin and the class of edge frequency range two, and the center bin of remaining corresponding cell of edge frequency range of each cell by each cell.The SRS of each cell edge frequency range is configured according to the setting of permission, and shared with neighboring BS information, without transmitting interactive information by X2 interface.The maximum UE number that edge frequency range allows is

2) UE distribution in edge is in edge frequency range, and center UE is distributed in center bin or remaining edge frequency range.

3) edge frequency range improves power, center bin reduction power.

4) UE of each cell distinguishes edge UE and center UE according to RSRP.

5) RNTP is indicated using double threshold RNTP_thr1、RNTP_thr2。

Step 2：RNTP uses RNTP first_thr1Judge and RNTP instructions are carried out to adjacent area, if the RSRQ calculated is unsatisfactory for requiring, it is believed that adjacent area carries out drop power to local area it cannot be guaranteed that local area UE.

Step 3：Notify adjacent area to carry out RNTP in the corresponding frequency range of this area edge frequency range and drop threshold processing by X2 interface, be RNTP_thr2.Judge whether adjacent area there are RNTP instructions again.

Step 4：In judged result, if still there is mutual RNTP to indicate, and the NF conditions between UE pairs are met, meet and then carry out NF operations, otherwise, direct BF operations.

Step 5：When there is NF operations, lifting with RSRQ performances or the UE with centering cause the UE to carry out NF due to the mobile or channel condition reason such as improve, then need again to carry out the UE independent RSRQ judgements, re-start resource allocation, re-start NF/BF and judge flow.

Step 6：NF/BF figurations are carried out in the corresponding band downlink of up calculating NF/BF weights.

Examples detailed above is described in detail below in conjunction with example 5 to 7 and relevant drawings, in the following example, it is assumed that have three neighbor cells, respectively cellA, cellB and cellC.

Example 5

Step 1：Initial setting up.

1) as shown in figure 4, F₃The SRS of frequency range is configured according to the setting of permission, and shared with neighboring BS information, without transmitting interactive information by X2 interface.F₃Frequency range allow maximum UE number be

Configuration and multiplexed form for SRS, if 1 UE, then directly take F₃If 2 UE, the then segmentation entered in line frequency or pectination are multiplexed；If 3 UE, then be first segmented, then wherein a certain section progress pectination multiplexing；If 4 UE, then be first segmented, pectination multiplexing is then carried out on each section.

2) n moment smooth values

Calculation formula it is as follows：

$\stackrel{\‾}{\mathrm{RSR}{Q}_n}=\mathrm{\α}\×{\mathrm{RSRQ}}_n+(1-\mathrm{\α})\×\stackrel{\‾}{{\mathrm{RSRQ}}_{n-1}}$

In formula：

--- previous moment smooth value；

RSRQ_n--- instantaneous value；

α --- smoothing factor.

3) RSRQ thresholding is set to RSRQ_thr, according to smooth index

With RSRQ_thrRelation judge the UE classification distributed in the order of severity that UE is disturbed, and influence different frequency range.When

When, UE is distributed in F₃, its quantity is no more than

Remaining edge UE is distributed in F₂, UE distribution in center is in F₁Or remaining edge frequency range；If there is no less than RSRQ_thrUE, then by edge UE distribution in F₃, while F₂Used as center bin.

4) edge frequency range improves power, center bin reduction power.

5) UE of each cell distinguishes edge UE and center UE according to Reference Signal Received Power (Reference Signal Received Power, referred to as RSRP).

6) the angle calculation formula for the angle that this cell and adjacent cell are made up of using base station summit：

$\cos \mathrm{\&theta;}=\frac{<x,y>}{\sqrt{<x,x>}\&times;\sqrt{<y,y>}}=\frac{x^{H}y}{\left|\right|x\left|\right|=\left|\right|y\left|\right|}$

$<x,y>=x^{H}y=\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{x}_i^H{y}_i$

X therein, y are UE channel estimation value.

Step 2：It is first determined whether the condition for opening ICIC functions is met, if it is satisfied, then opening ICIC functions；If it is not satisfied, then closing ICIC functions.Then judge whether to meet the condition for opening NF functions, if it is satisfied, then NF functions are opened, if it is not satisfied, then closing NF functions.Its flow refers to flow shown in Fig. 2.

Step 3：Each cell F is judged according to the resource allocation rule in step 1₂Frequency range carries out NF/BF operations.If each cell F₂Frequency range is disturbed adjacent area without RNTP and indicated, then F₂Frequency range directly carries out BF figuration operations；If local area F₂Frequency range has RNTP instructions to adjacent area, but the same position of adjacent area is indicated without RNTP, then F₂Frequency range carries out BF figurations；If local area F₂Frequency range has RNTP instructions to adjacent area, while the RNTP that the frequency range also receives adjacent area indicates that then the section carries out NF weight computings, due to local area F₂The SRS information of frequency range known target adjacent area, can estimate draw channel estimation value x, y of this cell and adjacent area by multi-cell channel, be judged according to angle calculation result between UE if appropriate for NF, as θ ∈ (θ_low θ_high) when, NF is appropriate for, is otherwise judged as being not suitable for carrying out BF.As shown in figure 5, judging that NF/BF flow specifically includes following steps：

Step S502, judges whether local area F2 has RNTP instructions to adjacent area, if it is, going to step S504, otherwise, goes to step S512；

Step S504, judges whether adjacent area has RNTP instructions in F2, if it is, going to step S506, otherwise, goes to step S512；

Step S506, estimates to draw channel estimation value x, y of this cell and adjacent area by multi-cell channel, and calculates above-mentioned angle angle according to above-mentioned angle calculation formula, goes to step S508；

Step S508, judges whether above-mentioned angle meets angular range, if it is, going to step S510, otherwise, goes to step S512；

Step S510, it is determined that meeting NF conditions；

Step S512, it is determined that meeting BF conditions, that is, is adapted to BF；

Step S514, terminates.

Step 4：When ICIC is not enabled, only NF is enabled.

When ICIC is not enabled, the frequency range divided in advance still retains, and SRS configuration information is also required to retain, and its resource distribution is as shown in Fig. 4 the latter half.This cell will

Less UE distribution is in F₃, the F of adjacent area₂Frequency range is judged still according to Fig. 5, is operated accordingly according to judged result.

Step 5：After NF is matched,

Lifting, but may the UE with centering cause the UE to carry out NF due to the mobile or channel condition reason such as improve, then need to carry out independent RSRQ to the UE again to judge, re-start resource allocation, re-start NF/BF and judge flow.Set one

Once

Then the UE is reappraised independentAs shown in fig. 6, said process specifically includes following steps：

Step S602, the UE protected to local area F2 by NF, calculate smooth RSRQ values；

Whether step S604, local area F2 RSRQ are more than the upper limit

If it is, going to step S606, otherwise, S608 is gone to step；

Step S606, re-starts each index to protected UE and individually calculates, and adjacent area protect in this paragraph local area UE UE also rejudge whether need continue NF, go to step S610；

Step S608, continues to keep original distribution；

Step S610, terminates.

Step 6：NF/BF figurations are carried out in the corresponding band downlink of up calculating NF/BF weights.

Resource static configuration figure in this example can also be as shown in Figure 7.It is F in resource static configuration Fig. 4₁∶F₂∶F₃It is F in=1: 1: 1, resource static configuration Fig. 7₁∶F₂∶F₃=2: 1: 1.Two kinds of Typical Dispositions are only listed, if F₁∶F₂∶F₃For other ratios, it can also as far as possible find out and frequency band is divided into as far as possible few frequency range configuration.

Example 6

Step 1：Initial setting up.

1) as shown in figure 8, F₃Frequency range SRS is configured according to the setting of permission, and shared with neighboring BS information, without transmitting interactive information by X2 interface.F₃Frequency range allow maximum UE number be

SRS configuration and multiplex mode are：If 1 UE, then F is directly taken₃If 2 UE, the then segmentation entered in line frequency or pectination are multiplexed；If 3 UE, then be first segmented, then wherein a certain section progress pectination multiplexing；If 4 UE, then be first segmented, pectination multiplexing is then carried out on each section.

2) n moment smooth values

Calculation formula it is as follows：

$\stackrel{\&OverBar;}{\mathrm{RSR}{Q}_n}=\mathrm{\&alpha;}\&times;{\mathrm{RSRQ}}_n+(1-\mathrm{\&alpha;})\&times;\stackrel{\&OverBar;}{{\mathrm{RSRQ}}_{n-1}}$

In formula：

--- previous moment smooth value；

RSRQ_n--- instantaneous value；

α --- smoothing factor.

3) RSRQ thresholding is set to RSRQ_thr, according to smooth index

Relation judge the UE classification distributed in the order of severity that UE is disturbed, and influence different frequency range.WhenWhen, UE is distributed in F₃, its quantity is no more than

Remaining edge UE is distributed in F₂, UE distribution in center is in F₁Or remaining edge frequency range；If there is no less than RSRQ_thrUE, Ze Jiang centers UE distribute in F₃。

4) edge frequency range improves power, center bin reduction power.

5) UE of each cell distinguishes edge UE and center UE according to RSRP.

6) the angle calculation formula for the angle that this cell and adjacent cell are made up of using base station summit：

$\cos \mathrm{\&theta;}=\frac{<x,y>}{\sqrt{<x,x>}\&times;\sqrt{<y,y>}}=\frac{x^{H}y}{\left|\right|x\left|\right|=\left|\right|y\left|\right|}$

$<x,y>=x^{H}y=\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{x}_i^H{y}_i$

X therein, y are UE channel estimation value.

Step 2：Judge ICIC, NF function enabled state, it differentiates that flow refers to flow shown in Fig. 2.

Step 3：Each cell F is judged according to the resource allocation rule in step 1₃Frequency range carries out NF/BF operations.If this cell F₃Frequency range is disturbed adjacent area without RNTP and indicated, then this cell F₃Frequency range directly carries out BF figuration operations；If local area F₃Frequency range has RNTP instructions to adjacent area, but the same position of adjacent area is indicated without RNTP, then F₃Frequency range carries out BF figurations；If local area F₃Frequency range has RNTP instructions to adjacent area, while the RNTP that the frequency range also receives adjacent area indicates that then the section carries out NF weight computings, due to local area F₃The SRS information of frequency range known target adjacent area, can estimate draw channel estimation value x, y of this cell and adjacent area by multi-cell channel, be judged according to angle calculation formula between UE if appropriate for NF, as θ ∈ (θ_low θ_high) when, NF is appropriate for, is otherwise judged as being not suitable for carrying out BF.Judge that NF/BF flow is as shown in Figure 9.

Step S902, judges whether local area F3 has RNTP instructions to adjacent area, if it is, going to step S904, otherwise, goes to step S912；

Step S904, judges whether adjacent area has RNTP instructions in F3, if it is, going to step S906, otherwise, goes to step 912；

Step S906, estimates to draw channel estimation value x, y of this cell and adjacent area by multi-cell channel, and calculates above-mentioned angle angle according to above-mentioned angle calculation formula, goes to step S908；

Step S908, judges whether above-mentioned angle meets angular range, if it is, going to step S910, otherwise, goes to step S912；

Step S910, it is determined that meeting NF conditions；

Step S912, it is determined that meeting BF conditions, that is, is adapted to BF；

Step S914, terminates.

In example 5, NF frequency ranges stagger, the situation that a cell carries out NF to the UE of more than two cells may not occur, but NF frequency ranges are divided in same region in example 6, occur that a cell needs to carry out two other cell NF situation, the weight computing of physical layer is related merely to, when angle judges, is still calculated between any two.As long as suitable with regard to carrying out NF, no matter suitably there are several adjacent areas.

Step 4：ICIC is not being opened, only during NF, in F₃Frequency range is identical with the processing mode of NF in step 3.

Step 5：NF on for having matched, if

The RNTP of the UE positions is then set to 0, the RSRP and RSRQ of the UE is recalculated, if still meet edge UE andRNTP is then set to 1 again, and participates in the judgement flow that NF/BF is operated in Fig. 9；If being unsatisfactory for NF condition, by UE distribution in place, that is, the attribute and frequency domain position of the UE is redistributed.It keeps/exited NF to judge that flow is as shown in Figure 10.

Step S1002, the UE protected to local area F3 by NF, calculate smooth RSRQ values；

Step S1004, judges whether the F3 of local area RSRQ is more than the upper limit

If it is, going to step S1006, otherwise, S1014 is gone to step；

Step S1006, sets to 0 to the RNTP of the frequency domain position shared by the local area F3 UE, calculates RSRQ；

Step S1008, judges whether local area F3 RSRQ is less than lower limit RSRQ_thr, if it is, going to step S1010, otherwise, go to step S1012；

Step S1010, continues NF and judges flow, due to need to only be maintained the original state in this step, RNTP value or 1, therefore need not individually put 1, as long as maintaining the original state.Go to step S1016；

Step S1012, distributes frequency range according to RSRP, the RSRQ recalculated, rejudges operational attribute；

Step S1014, continues to keep original distribution, goes to step S1016；

Step S1016, terminates.

Step 6：NF/BF figurations are carried out in the corresponding band downlink of up calculating NF/BF weights.

Example 7

Step 1：Initial setting up：

1) as shown in figure 11, F₂Frequency range SRS is configured according to the setting of permission, and shared with neighboring BS information, without transmitting interactive information by X2 interface.F₂Frequency range allow maximum UE number be

SRS configuration：If 1 UE, then F is directly taken₂If 2 UE then divide F equally₂Frequency range.

2) UE distribution in edge is in F₂, UE distribution in center is in F₁Or remaining edge frequency range.

3) edge frequency range improves power, center bin reduction power.

4) UE of each cell distinguishes edge UE and center UE according to RSRP.

5) n moment smooth values

Calculation formula it is as follows：

$\stackrel{\&OverBar;}{\mathrm{RSR}{Q}_n}=\mathrm{\&alpha;}\&times;{\mathrm{RSRQ}}_n+(1-\mathrm{\&alpha;})\&times;\stackrel{\&OverBar;}{{\mathrm{RSRQ}}_{n-1}}$

In formula：

--- previous moment smooth value；

RSRQ_n--- instantaneous value；

α --- smoothing factor.

6) angle judgment formula：

$\cos \mathrm{\&theta;}=\frac{<x,y>}{\sqrt{<x,x>}\&times;\sqrt{<y,y>}}=\frac{x^{H}y}{\left|\right|x\left|\right|=\left|\right|y\left|\right|}$

$<x,y>=x^{H}y=\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{x}_i^H{y}_i$

X therein, y are UE channel estimation value.

Step 2：RNTP is indicated using double threshold RNTP_thr1、RNTP_thr2.Local area RNTP first uses RNTP_thr1Judge and RNTP instructions are carried out to adjacent area, if calculateThen it is believed that adjacent area, which carries out drop power to local area, cannot guarantee that local area UE's

Condition is met, notifies adjacent area in local area F by X2 interface₂The corresponding frequency range of frequency range carries out RNTP drop threshold processings, is RNTP_thr2.Judge whether adjacent area there are RNTP instructions again.On this basis, continue to judge whether the angle between UE meets condition, as θ ∈ (θ_low θ_high) when, NF is appropriate for, is otherwise judged as being not suitable for carrying out BF.As shown in figure 12, above-mentioned judgement NF/BF flows comprise the following steps：

Step S1202, each cell is according to the first thresholdings of RNTP RNTP_thr1, carry out RNTP instructions；

Step S1204, resource allocation calculates smooth RSRQ values；

Step S1206, judges whether local area F2 RSRQ meets requirement, if it is, going to step S1220, otherwise, goes to step S1208；

Step S1208, notifies adjacent area to reduce RNTP thresholdings (dropping thresholding) in the corresponding F2 of local area, RNTP is indicated again；

Step S1210, whether have RNTP instruction, if it is, going to step S1212, otherwise, go to step S1220 if judging the F2 of adjacent area correspondence local area；

Step S1212, judges whether local area has RNTP instructions in F2, if it is, going to step S1214, otherwise, goes to step S1220；

Step S1214, is estimated by multi-cell channel, according to it is above-mentioned 6) in formula calculate angle；

Step S1216, judges whether angle meets angular range, if it is, going to step S1218, otherwise, goes to step S1220；

Step S1218, adjacent area correspondence local area F2 frequency ranges NF (i.e. this section calculates NF weights), goes to step S1222；

Step S1220, adjacent area correspondence local area F2 frequency ranges BF (i.e. this section calculates BF weights), goes to step S1222；

Step S1222, terminates.

Step 3：According toJudge NF keep/exit state, its flow is as shown in Figure 6.Compared with example 5, judge that flow is identical, difference is that example 5 is an adjacent area protection local area; this example is that some or all of in multiple cells protects local area; when NF exits judgement, one or more adjacent areas will also judge, because its target is identical so operation is also naturally identical.

Step 4：NF/BF figurations are carried out in the corresponding band downlink of up calculating NF/BF weights.

Figure 13 is the structured flowchart of the restraining device of the inter-cell interference ICI according to the embodiment of the present invention.As shown in figure 13, the device includes：

Determining module 130, the enabled state of the Inter-Cell Interference Coordination ICIC for determining local area；

First judge module 132, is connected with determining module 130, the enabled state of the null NF in the case of ICIC enabled state, judging local area；

Second judge module 134, is connected with the first judge module 132, for when ICIC and NF is enabled or NF is enabled, judging NF conditions whether are met between local area and adjacent area；

Performing module 136, it is connected with the second judge module 134, in the case of being in the output result of the second judge module 134, the suppression for carrying out ICI is operated using NF, and in the case where the output result of the second judge module 134 is no, the suppression for carrying out ICI is operated using wave beam forming BF.

In a preferred embodiment of the invention, as shown in figure 14, said apparatus also includes：Resource distribution module 138, is connected with determining module 130, the resource distribution mode for pre-setting the ICIC and the NF, wherein, the resource distribution mode includes one below：Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+BF frequency ranges of each adjacent area stagger on frequency domain, have that the edge UE+NF frequency ranges of at most one adjacent area are corresponding with the edge UE+BF frequency ranges of local area in the adjacent area, the remaining frequency range of the local area and adjacent area is divided still according to ICIC frequency range dividing mode；Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+NF frequency ranges of each cell concentrate on identical interval on frequency domain, and the remaining frequency range of local area and adjacent area is divided still according to ICIC frequency range dividing mode；The frequency range dividing mode that ICIC is continued to use in local area and adjacent area is divided.

In a preferred embodiment of the invention, as shown in figure 14, said apparatus can also include following processing module：3rd judge module 140, is connected with performing module 136, for after using NF operations, judging user equipment (UE) to whether meeting NF pairing conditions, wherein, NF pairing conditions are used for the UE for indicating UE centerings if appropriate for NF；4th judge module 142, it is connected with the 3rd judge module 140, in the case of being in the output result of the 3rd judge module 140, judge whether to meet NF exit criterias according to the index specified of monitoring, if met, performing module 136 is then notified to exit NF operations, wherein, index is used to indicate the degree that UE is disturbed.If in practical application, being unsatisfactory for NF exit criterias, performing module 136 can be notified to continue NF operations, any action can not also be made (so, performing module 136 is due to being not affected by any instruction, so may proceed to NF operations).

During concrete application, above-mentioned second judge module 134, for judging whether to meet NF conditions according to local area narrow emission power RNTP related to adjacent area combined information, wherein, combined information is used to indicate whether local area and/or adjacent area have RNTP instructions, when there are RNTP instructions local area and adjacent area, then meets NF conditions, otherwise, NF conditions are unsatisfactory for.

During concrete application, above-mentioned second judge module 134, for being judged whether to meet NF conditions according in the following manner：The related narrow emission power RNTP of local area uses the first predetermined threshold value RNTP_thr1Judge and RNTP instructions are carried out to adjacent area, wherein, using the first predetermined threshold value RNTP_thr1In deterministic process, if the smooth value RSRQ calculated is unsatisfactory for requiring, then it is assumed that adjacent area carries out drop power to local area it cannot be guaranteed that local area UE；Adjacent area is notified to use the second predetermined threshold value RNTP in the corresponding frequency range of this area edge frequency range_thr2RNTP drop threshold processings are carried out, judge whether adjacent area there are RNTP instructions again；If there are RNTP instructions in local area and adjacent area, NF conditions are met, otherwise, NF conditions are unsatisfactory for.

It should be noted that in said apparatus each module correlation combine preferred working method specifically can method described above embodiment description, here is omitted.

As can be seen from the above description, the present invention realizes following technique effect：

Above-described embodiment is used on ICIC basis, the technological means being scheduled to NF and ICIC, solve in correlation technique because ICIC mutually conflicts with NF resource distribution mode, effectively two kinds of scheduling strategies can not be scheduled, the problems such as gain that influence above two strategy is brought, the effect dispatched to NF and ICIC two ways is realized so as to reach, and then effectively realizes the effect for the gain that above two method is brought.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the invention or each step can be realized with general computing device, they can be concentrated on single computing device, or be distributed on the network that multiple computing devices are constituted, alternatively, they can be realized with the executable program code of computing device, so as to, it can be stored in storage device and be performed by computing device, and in some cases, can be with the step shown or described by being performed different from order herein, or they are fabricated to each integrated circuit modules respectively, or be fabricated to single integrated circuit module to realize by the multiple modules or step in them.So, the present invention is not restricted to any specific hardware and software combination.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art, the present invention there can be various modifications and variations.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection.

Claims (11)

1. a kind of inter-cell interference ICI suppressing method, it is characterised in that including：

It is determined that local area Inter-Cell Interference Coordination ICIC enabled state in the case of, judge the null NF of local area enabled state；

When the ICIC and the NF are enabled or NF is enabled, judge NF conditions whether are met between the local area and adjacent area, if it is satisfied, then the suppression for carrying out ICI is operated using NF, if be unsatisfactory for, using wave beam forming BF operation progress ICI suppression.

2. according to the method described in claim 1, it is characterised in that also include：The ICIC and the NF resource distribution mode are pre-set, wherein, the resource distribution mode includes one below：

Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+BF frequency ranges of each adjacent area stagger on frequency domain, have that the edge UE+NF frequency ranges of at most one adjacent area are corresponding with the edge UE+BF frequency ranges of local area in the adjacent area, the remaining frequency range of the local area and adjacent area is divided still according to ICIC frequency range dividing mode；

Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+NF frequency ranges of each cell concentrate on identical interval on frequency domain, and the remaining frequency range of local area and adjacent area is divided still according to ICIC frequency range dividing mode；

The frequency range dividing mode that ICIC is continued to use in local area and adjacent area is divided.

3. method according to claim 1 or 2, it is characterised in that after using NF operations, in addition to：

Judge user equipment (UE) to whether meeting NF pairing conditions；If met, then according to the index specified of monitoring, judge whether to meet NF exit criterias, if it is satisfied, then NF operations are exited, if be unsatisfactory for, then continue NF operations, wherein, the index is used to indicate the degree that the UE centerings UE is disturbed, and the NF pairings condition is used for the UE for indicating the UE centerings if appropriate for NF.

4. method according to claim 3, it is characterised in that described to judge UE to whether meeting NF pairing conditions, including：

Determine the angle for the angle that the UE of local area and the UE of adjacent area are made up of using base station summit；

When the angle is in default angular range, then the NF pairings condition is met, otherwise, be unsatisfactory for the NF pairings condition.

5. method according to claim 1 or 2, it is characterised in that described to judge NF conditions whether are met between the local area and adjacent area, including：

Judge whether to meet NF conditions according to local area narrow emission power RNTP related to the adjacent area combined information, wherein, the combined information is used to indicate whether local area and/or adjacent area have RNTP instructions, when there are RNTP instructions the local area and adjacent area, then meet the NF conditions, otherwise, the NF conditions are unsatisfactory for.

6. method according to claim 1 or 2, it is characterised in that described to judge NF conditions whether are met between the local area and adjacent area, including：

Using the first predetermined threshold value RNTP_thr1Judge the related narrow emission power RNTP of the local area and RNTP instructions are carried out to adjacent area, wherein, using the first predetermined threshold value RNTP_thr1In deterministic process, if the smooth value RSRQ calculated is unsatisfactory for requiring, then it is assumed that adjacent area carries out drop power to local area it cannot be guaranteed that local area UE；

Adjacent area is notified to use the second predetermined threshold value RNTP in the corresponding frequency range of this area edge frequency range_thr2RNTP drop threshold processings are carried out, judge whether adjacent area there are RNTP instructions again；

When there are RNTP instructions in local area and adjacent area, then the NF conditions are met, otherwise, be unsatisfactory for the NF conditions.

7. a kind of inter-cell interference ICI restraining device, it is characterised in that including：

Determining module, the enabled state of the Inter-Cell Interference Coordination ICIC for determining local area；

First judge module, the enabled state of the null NF in the case of the enabled state of the ICIC, judging the local area；

Second judge module, for when the ICIC and the NF are enabled or NF is enabled, judging NF conditions whether are met between the local area and adjacent area；

Performing module, in the case of being in the second judge module output result, the suppression for carrying out ICI is operated using NF, and in the case where the second judge module output result is no, the suppression for carrying out ICI is operated using wave beam forming BF.

8. device according to claim 7, it is characterised in that also include：Resource distribution module, the resource distribution mode for pre-setting the ICIC and the NF, wherein, the resource distribution mode includes one below：

Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+BF frequency ranges of each adjacent area stagger on frequency domain, have that the edge UE+NF frequency ranges of at most one adjacent area are corresponding with the edge UE+BF frequency ranges of local area in the adjacent area, the remaining frequency range of the local area and adjacent area is divided still according to ICIC frequency range dividing mode；Local area and adjacent area individually divide edge UE+BF frequency ranges, edge UE+NF frequency ranges and center bin, and the edge UE+NF frequency ranges of each cell concentrate on identical interval on frequency domain, and the remaining frequency range of local area and adjacent area is divided still according to ICIC frequency range dividing mode；The frequency range dividing mode that ICIC is continued to use in local area and adjacent area is divided.

9. the device according to claim 7 or 8, it is characterised in that also include：

3rd judge module, for after using NF operations, judging user equipment (UE) to whether meeting NF pairing conditions, wherein, the NF pairings condition is used for the UE for indicating the UE centerings if appropriate for NF；

4th judge module, in the case of being in the 3rd judge module output result, judges whether to meet NF exit criterias according to the index specified of monitoring, if met, the performing module is then notified to exit NF operations, wherein, the index is used to indicate the degree that the UE is disturbed.

10. the device according to claim 7 or 8, it is characterized in that, second judge module, for judging whether to meet NF conditions according to local area narrow emission power RNTP related to the adjacent area combined information, wherein, the combined information is used to indicate whether local area and/or adjacent area have RNTP instructions, when there are RNTP instructions the local area and adjacent area, the NF conditions are then met, otherwise, the NF conditions are unsatisfactory for.

11. the device according to claim 7 or 8, it is characterised in that second judge module, for being judged whether to meet NF conditions according in the following manner：The related narrow emission power RNTP of local area uses the first predetermined threshold value RNTP_thr1Judge and RNTP instructions are carried out to adjacent area, wherein, using the first predetermined threshold value RNTP_thr1In deterministic process, if the smooth value RSRQ calculated is unsatisfactory for requiring, then it is assumed that adjacent area carries out drop power to local area it cannot be guaranteed that local area UE；Adjacent area is notified to use the second predetermined threshold value RNTP in the corresponding frequency range of this area edge frequency range_thr2RNTP drop threshold processings are carried out, judge whether adjacent area there are RNTP instructions again；If there are RNTP instructions in local area and adjacent area, the NF conditions are met, otherwise, the NF conditions are unsatisfactory for.

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