CN104640219A - Interference coordinated sub-frame configuration method and device - Google Patents

Interference coordinated sub-frame configuration method and device Download PDF

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Publication number
CN104640219A
CN104640219A CN201510053079.9A CN201510053079A CN104640219A CN 104640219 A CN104640219 A CN 104640219A CN 201510053079 A CN201510053079 A CN 201510053079A CN 104640219 A CN104640219 A CN 104640219A
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China
Prior art keywords
frame
sub
community
subframe
interference
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Inventor
唐余亮
陈昊
蓝亦芃
高志斌
林敏�
李馨
廖礼宇
张远见
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Xiamen University
Comba Telecom Technology Guangzhou Ltd
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Xiamen University
Comba Telecom Technology Guangzhou Ltd
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Priority to CN201510053079.9A priority Critical patent/CN104640219A/en
Publication of CN104640219A publication Critical patent/CN104640219A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Abstract

The invention discloses an interference coordinated sub-frame configuration method and device, and aims to solve the problem that interference coordination cannot be performed for cross sub-frame interference of every two adjacent cells when the cells are densely allocated. The method comprises the following steps: setting each downlink sub-frame in a cross sub-frame set of each cell to be a silent sub-frame respectively when sub-frame configuration is performed for each cell, wherein the cross sub-frame set comprises at least one cross sub-frame, and the cross sub-frame is formed by configuring different sub-frames at uplink and downlink sub-frames of different sub-frame configuration types in a wireless frame of a same structure; judging whether the silent sub-frame of each cell conforms to a recovery condition in sequence, recovering each silent sub-frame which conforms to the recovery condition to be the downlink sub-frame, wherein the recovery condition is that the interference level stressed on a neighbor cell of one cell does not exceed a set interference threshold value on the recovered downlink sub-frame after the silent sub-frame of the cell is recovered to be the downlink sub-frame. By using the method, the interference among the cells is eliminated and the downlink throughput is guaranteed.

Description

A kind of subframe configuration method of interference coordination and device
Technical field
The present invention relates to mobile communication system field, particularly relate to a kind of subframe configuration method and device of interference coordination.
Background technology
TD SDMA (TD-SCDMA), time-division-Long Term Evolution (Time Division Long Term Evolution, TD-LTE) be all time division duplex (Time division duplex, TDD) system, adopt time-division that time-domain resource is divided into multiple time slot, transmitting channel under same frequency and receive channel, i.e. up (UL) channel and descending (DL) channel is separated by the difference of time slot.Dynamic TDD technology, namely TDD mobile communication system row channel and down channel dynamically can configure the technology of time-domain resource thereon, for meeting the asymmetric demand of up-downgoing service traffics.
In TD-LTE system, a radio frames is 10ms, is made up of 10 1ms subframes, and field is 5ms, and subframe comprises the long time slot of two 0.5ms, is divided into the up-downgoing change-over period to be two kinds of frame structures of 5ms and 10ms, consults as shown in table 1 below.
Table 1
As shown in table 1, D represents descending sub frame, and U represents sub-frame of uplink, and S represents special subframe, and special subframe is made up of uplink pilot time slot, descending pilot frequency time slot and protection interval three part.Wherein, the up-downgoing change-over period is the frame structure of 5ms, and the sub-frame configuration of two fields is identical, and namely subframe 1 is corresponding identical respectively to the sub-frame configuration of subframe 9 with subframe 5 to the sub-frame configuration of subframe 4, comprises 4 kinds of subframe Configuration Types.The up-downgoing change-over period is the frame structure of 10ms, and the sub-frame configuration of two fields is not identical, comprises 3 kinds of subframe Configuration Types.
In TD-LTE system, sub-frame of uplink number and descending sub frame number in a frame can be adjusted flexibly, make cell allocation to uplink and downlink timeslot resource and up-downgoing traffic carrying capacity match, avoid the situation of the unidirectional limited or waste of the resource that causes because up-downgoing traffic carrying capacity is asymmetric as far as possible, thus can system resource be made full use of, power system capacity is had a distinct increment.But when the ascending-descending subframes of adjacent cell and this community configures inconsistent, intersection subframe can be formed, namely in same subframe position, this community is different from the subframe type of adjacent cell, such as this community adopts sub-frame configuration type 0, adjacent cell adopts sub-frame configuration Class1, and on the position of subframe 4, the sub-frame of uplink of this community and the descending sub frame of adjacent cell can form intersection subframe.The problem that the generation intersecting subframe will cause the downstream signal of adjacent cell to disturb the upward signal of this community, particularly, when the comparatively near and line-of-sight propagation of base station spacing or channel condition better time, the downstream signal of adjacent cell produces very large interference by the upward signal of this community.Because TD-LTE system adopts Adaptive Modulation and Coding mode, the mutual interference of minizone, thus cause the user of this community and adjacent cell all to adopt low-order-modulated coded system, also can cause conversation loss time serious.If do not take measures, the strong jamming intersected in subframe position can cause larger system capacity loss.
The mode of sub-clustering is adopted to alleviate the interference of intersection subframe in prior art, namely the base station of same cluster is divided into adopt identical sub-frame configuration, the base station of different bunches adopts identical or different sub-frame configuration, this scheme to be generally applicable to bunch the scene for Hot Spot covers, now, distance between each bunch is comparatively large, and between bunch, interference can be ignored.In order to adapt to the growth at full speed of future customer business demand, the whole network cell deployment is all tending towards densification, if now still adopt the method for sub-clustering to configure subframe, bunch spacing is comparatively near, interference between cannot effectively overcoming bunch.Due to cell deployment densification, for reducing presence of intercell interference, if the whole network all uses identical sub-frame configuration, just cannot carry out Dynamic Matching system resource according to each Zone demand, easily causing the waste of resource, reduce the throughput of network.Therefore this sub-clustering alleviates and intersects the scheme of subframe interference and effectively cannot implement flexibly dynamically TDD interference coordination to each community.
Summary of the invention
The embodiment of the present invention provides a kind of subframe configuration method and device of interference coordination, in order to solve in prior art exist cell deployment intensive when, the problem of carrying out dynamic TDD interference coordination cannot be disturbed for each community and the subframe of intersecting of its adjacent cell.
The embodiment of the present invention provides a kind of subframe configuration method and device of interference coordination, and concrete scheme is as follows:
A subframe configuration method for interference coordination, the method comprises:
When carrying out sub-frame configuration for each community, respectively each descending sub frame in the intersection sub-frame set of each community is set to subframe of mourning in silence, wherein, sub-frame set of intersecting comprises at least one intersection subframe, and subframe of intersecting is that in the radio frames of same structure, in different sub-frame configuration types, ascending-descending subframes configures different subframes;
Judge whether the subframe of mourning in silence of each community meets recover condition successively, the subframe of mourning in silence meeting recover condition is reverted to descending sub frame, wherein, recover condition is that one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold.
The scheme that the embodiment of the present invention provides, can for the situation of community dense deployment, carry out effective interference coordination, by the method for the subframe that is set to by the descending sub frame intersected in subframe to mourn in silence, the uplink of downlink transfer to neighbor cell reducing community causes the problem of interference.Further, in order to increase downlink throughput capacity, after recovering, disturb minimum principle, subframe of mourning in silence reverts to descending sub frame again according to recover condition, to ensure the utilance of downlink resource.
Preferably, before the subframe that each descending sub frame in the intersection sub-frame set of each community is set to mourn in silence respectively, also comprise:
Determine the up-downgoing duty ratio of respective cell according to the upstream rate demand of each community and downstream rate demand, and determine according to the up-downgoing duty ratio of each community the sub-frame configuration type that respective cell adopts.
Preferably, after the subframe that each descending sub frame in the intersection sub-frame set of each community is set to mourn in silence respectively, before judging whether the subframe of mourning in silence of each community meets recover condition successively, also comprise:
Calculate total interference value that each sub-frame of uplink corresponding in the intersection sub-frame set of each community is subject to;
Obtain user's average signal power value that base station corresponding to each community receives, and the average signal interference ratio of user uplink on each sub-frame of uplink in the intersection sub-frame set of user's average signal power value of receiving of the base station corresponding according to each community and corresponding total interference value calculation plot.
Preferably, total interference value w that the sub-frame of uplink in the intersection sub-frame set of a community m is subject to is determined according to following formula m, comprising:
w l - m = B l × Σ k = 1 n l P k n l + ( 1 - B l ) × A l × P l - m ;
Wherein, w l-mbe the interference value that a community m is subject to its adjacent cell l on a sub-frame of uplink, P kbe the uplink interference power that a community m is subject to the user k in its adjacent cell l, P l-mit is the descending interference power that a community m is subject to its adjacent cell l;
If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is sub-frame of uplink, then B l=1; If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is descending sub frame, then B l=0 and A l=1; If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is subframe of mourning in silence, then B l=0 and A l=0;
w m = Σ l = 1 N w l - m ;
Wherein, w mbe total interference value that a community m is subject on a sub-frame of uplink, l=1 to l=N is used to indicate a community m on a sub-frame of uplink, all adjacent cell 1 to adjacent cell N its up channel being produced to interference.
By this possible execution mode, adopt the mode of interference figure, every dynamic parameter of calculation plot, make the judgement for recover condition more accurate, while ensure that downlink transfer throughput, avoid the interference of intersection subframe.
Preferably, judge whether the subframe of mourning in silence of each community meets recover condition, comprising successively:
Judge whether each subframe of mourning in silence of respective cell meets recover condition successively according to the priority order from high to low of each community, wherein, priority is used to indicate the upstream traffic demand of community and the summation of downlink traffic demand.
By this possible execution mode, the upstream rate demand of community and the summation of downlink traffic demand larger, the priority of community is higher, more preferentially judge whether the subframe of mourning in silence of this community can revert to descending sub frame, the community making traffic needs large can recover the downlink transfer in a part of subframe at first, ensure that the downlink throughput capacity of network.
Preferably, one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, and on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold, comprising:
One of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, calculates the average signal interference ratio of user uplink of each adjacent cell on the descending sub frame after recovery of a community;
The up average signal interference ratio of counting user is lower than the adjacent cell number of predetermined threshold value;
When determining that the adjacent cell number of the average signal interference ratio of user uplink lower than predetermined threshold value is less than or equal to setting number of cells, determine on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold;
Wherein, before the average signal interference ratio of user uplink reverts to descending sub frame lower than the adjacent cell of predetermined threshold value not included in subframe of mourning in silence of a community, the up average signal interference ratio of its active user is lower than the adjacent cell of predetermined threshold value, the up average signal interference ratio of active user is that one of Jiang mono-community is mourned in silence before subframe reverts to descending sub frame, calculates according to the sub-frame configuration before recovering.
A sub-frame configuration device for interference coordination, device comprises:
Dispensing unit, for when carrying out sub-frame configuration for each community, respectively each descending sub frame in the intersection sub-frame set of each community is set to subframe of mourning in silence, wherein, sub-frame set of intersecting comprises at least one intersection subframe, and subframe of intersecting is that in the radio frames of same structure, in different sub-frame configuration types, ascending-descending subframes configures different subframes;
Recovery unit, for judging whether the subframe of mourning in silence of each community meets recover condition successively, the subframe of mourning in silence meeting recover condition is reverted to descending sub frame, wherein, recover condition is that one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold.
The scheme that the embodiment of the present invention provides, can for the situation of community dense deployment, carry out effective interference coordination, by the method for the subframe that is set to by the descending sub frame intersected in subframe to mourn in silence, the uplink of downlink transfer to neighbor cell reducing community causes the problem of interference.Further, in order to increase downlink throughput capacity, after recovering, disturb minimum principle, subframe of mourning in silence reverts to descending sub frame again according to recover condition, to ensure the utilance of downlink resource.
Preferably, device also comprises:
Computing unit, for determining the up-downgoing duty ratio of respective cell according to the upstream rate demand of each community and downstream rate demand, and determines according to the up-downgoing duty ratio of each community the sub-frame configuration type that respective cell adopts.
Preferably, computing unit, also for: after the subframe that each descending sub frame in the intersection sub-frame set of each community is set to mourn in silence respectively, before judging whether the subframe of mourning in silence of each community meets recover condition successively, calculate total interference value that each sub-frame of uplink corresponding in the intersection sub-frame set of each community is subject to, obtain user's average signal power value that base station corresponding to each community receives, and the average signal interference ratio of user uplink on each sub-frame of uplink in the intersection sub-frame set of the user's average signal power value received according to base station corresponding to each community and corresponding total interference value calculation plot.
Preferably, computing unit, specifically for determining total interference value w that the sub-frame of uplink in the intersection sub-frame set of a community m is subject to according to following formula m:
w l - m = B l × Σ k = 1 n l P k n l + ( 1 - B l ) × A l × P l - m ;
Wherein, w l-mbe the interference value that a community m is subject to its adjacent cell l on a sub-frame of uplink, P kbe the uplink interference power that a community m is subject to the user k in its adjacent cell l, P l-mit is the descending interference power that a community m is subject to its adjacent cell l;
If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is sub-frame of uplink, then B l=1; If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is descending sub frame, then B l=0 and A l=1; If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is subframe of mourning in silence, then B l=0 and A l=0;
w m = Σ l = 1 N w l - m ;
Wherein, w mbe total interference value that a community m is subject on a sub-frame of uplink, l=1 to l=N is used to indicate a community m on a sub-frame of uplink, all adjacent cell 1 to adjacent cell N its up channel being produced to interference.
By this possible execution mode, adopt the mode of interference figure, every dynamic parameter of calculation plot, make the judgement for recover condition more accurate, while ensure that downlink transfer throughput, avoid the interference of intersection subframe.
Preferably, recovery unit, specifically for:
Judge whether each subframe of mourning in silence of respective cell meets recover condition successively according to the priority order from high to low of each community, wherein, priority is used to indicate the upstream traffic demand of community and the summation of downlink traffic demand.
By this possible execution mode, the upstream rate demand of community and the summation of downlink traffic demand larger, the priority of community is higher, more preferentially judge whether the subframe of mourning in silence of this community can revert to descending sub frame, the community making traffic needs large can recover the downlink transfer in a part of subframe at first, ensure that the downlink throughput capacity of network.
Preferably, recovery unit, specifically for:
One of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, calculates the average signal interference ratio of user uplink of each adjacent cell on the descending sub frame after recovery of a community;
The up average signal interference ratio of counting user is lower than the adjacent cell number of predetermined threshold value;
When determining that the adjacent cell number of the average signal interference ratio of user uplink lower than predetermined threshold value is less than or equal to setting number of cells, determine on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold;
Wherein, before the average signal interference ratio of user uplink reverts to descending sub frame lower than the adjacent cell of predetermined threshold value not included in subframe of mourning in silence of a community, the up average signal interference ratio of its active user is lower than the adjacent cell of predetermined threshold value, the up average signal interference ratio of active user is that one of Jiang mono-community is mourned in silence before subframe reverts to descending sub frame, calculates according to the sub-frame configuration before recovering.
Accompanying drawing explanation
Fig. 1 is the flow chart of the subframe configuration method of interference coordination in the embodiment of the present invention;
Fig. 2 is the TD-LTE picocell dense distribution topological diagram in the embodiment of the present invention;
Fig. 3 is the intersection subframe interference schematic diagram in the embodiment of the present invention;
Fig. 4 is the two-way interference figure of the TD-LTE picocell in the embodiment of the present invention;
Fig. 5 is the sub-frame configuration flow chart in the embodiment of the present invention;
Fig. 6 is the device composition schematic diagram in the embodiment of the present invention;
Fig. 7 is the sub-frame configuration structure drawing of device of the interference coordination in the embodiment of the present invention.
Embodiment
In order to be given in cell deployment intensive when, improve throughput of system, alleviate the implementation of presence of intercell interference, embodiments provide a kind of subframe configuration method and device of interference coordination.Below in conjunction with Figure of description, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.And when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Subframe of mourning in silence (Almost Blank Subframe, or claim almost blank subframe ABS), this subframe there is no signal transmission, but in order to make user's energy backward compatibility of 3GPP R8/R9 version, subframe of mourning in silence can be transmitted the exclusive pilot signal in community (Cell-specific reference signals, CRS), master sync signal (Primary Synchronized Signal, PSS), auxiliary synchronous signals (Secondary Synchronization Signal, SSS), Physical Broadcast Channel (Physical Broadcast Channel, PBCH), but the power in power ratio normal sub-frames is little, to reduce the time slot interference of neighbor cell on same carrier wave.Therefore, in order to reduce the interference to neighbor cell, the corresponding subframe of interference source community can be set to subframe of mourning in silence, thus realize the interference coordination between neighbor cell.
The embodiment of the present invention provides a kind of subframe configuration method of interference coordination, consults shown in Fig. 1, and concrete implementation step is as follows:
Step 100: when carrying out sub-frame configuration for each community, respectively each descending sub frame in the intersection sub-frame set of each community is set to subframe of mourning in silence, wherein, sub-frame set of intersecting comprises at least one intersection subframe, and subframe of intersecting is that in the radio frames of same structure, in different sub-frame configuration types, ascending-descending subframes configures different subframes.
Concrete, when sub-frame configuration is carried out in each community for the whole network, the up-downgoing change-over period of setting sub-frame configuration, usually, the each community of the whole network adopts the sub-frame configuration type of identical up-downgoing change-over period, and setting subframe reshuffles the cycle, so that in real time according to the sub-frame configuration that the load renewal community of each community adopts, wherein, the up-downgoing change-over period adopted when the subframe cycle of reshuffling should be greater than sub-frame configuration.The subframe configuration method of reshuffling in the cycle for a subframe is below introduced.
Before the subframe that is set to by each descending sub frame in the intersection sub-frame set of each community respectively to mourn in silence, also comprise according to network load condition, for its sub-frame configuration type adopted is selected in each community, method is as follows:
Determine the up-downgoing duty ratio of respective cell according to the upstream rate demand of each community and downstream rate demand, and determine according to the up-downgoing duty ratio of each community the sub-frame configuration type that respective cell adopts.
The following formula of concrete employing determines the up-downgoing duty ratio Needrate_ratio of any cell i i:
Needrate _ ratio i = Σ j ∈ cell _ i v j _ U Σ j ∈ cell _ i v j _ D ;
Wherein, v j_Ufor the upstream rate demand of the user j in any cell i, v j_Dfor the downstream rate demand of user j in cell i.
Such as, when adopting the up-downgoing change-over period to be the frame structure of 5ms, 4 kinds of subframe Configuration Types are had.Determine ascending-descending subframes of cell ratio (UL:DL) and this community up-downgoing duty ratio Needrate_ratio iimmediate sub-frame configuration type.
slot _ ratio i = arg min j { | Needrate _ ratio i - config _ ratio j | } ;
Wherein, slot_ratio ifor the ascending-descending subframes ratio that any cell i should adopt, config_ratio jfor the ascending-descending subframes ratio of jth kind subframe Configuration Type supported in tdd systems, argmin{} is the function calculating the ascending-descending subframes ratio meeting up-downgoing duty ratio and the minimum jth kind subframe Configuration Type of ascending-descending subframes proportional difference, which kind of frame structure what the span of j depended on employing is, be the frame structure of 5ms according to the up-downgoing change-over period, then the span of j is 0,1,2 or 6, be the frame structure of 10ms according to the up-downgoing change-over period, then the span of j is 3,4 or 5.Such as, if when calculating the ascending-descending subframes ratio of any cell i, determine in 4 kinds of subframe Configuration Types when the up-downgoing change-over period is 5ms, the up-downgoing duty ratio difference of the ascending-descending subframes ratio of the 2nd kind of subframe Configuration Type and this any community is minimum, then the value that argmin{} function calculates is the ascending-descending subframes ratio of the 2nd kind of subframe Configuration Type.
When each subframe cycle of reshuffling starts, respectively each descending sub frame in the intersection sub-frame set of each community is set to subframe of mourning in silence, wherein, sub-frame set of intersecting comprises at least one intersection subframe, and subframe of intersecting is that in a radio frames, in different sub-frame configuration types, ascending-descending subframes configures different subframes.Consult shown in table 1, the up-downgoing change-over period is that the sub-frame configuration type of 5ms comprises 4 kinds, i.e. sub-frame configuration type 0, sub-frame configuration Class1, sub-frame configuration type 2 and sub-frame configuration type 6, in these 4 kinds of subframe Configuration Types, the ascending-descending subframes configuration in these 4 kinds of subframe Configuration Types of subframe 3, subframe 4, subframe 8 and subframe 9 is not identical, therefore, subframe 3, subframe 4, subframe 8 and subframe 9 are respectively intersection subframe, and the sub-frame set of its composition is for intersecting sub-frame set.The up-downgoing change-over period is that the sub-frame configuration type of 10ms comprises 3 kinds, i.e. sub-frame configuration type 3, sub-frame configuration type 4 and sub-frame configuration type 5, in these 3 kinds of subframe Configuration Types, the ascending-descending subframes configuration in these 3 kinds of subframe Configuration Types of subframe 3 and subframe 4 is not identical, therefore, subframe 3 and subframe 4 are respectively intersection subframe, and the sub-frame set of its composition is for intersecting sub-frame set.
When each subframe cycle of reshuffling starts, respectively each descending sub frame in the intersection sub-frame set of each community is set to subframe of mourning in silence.Such as, if community adopts sub-frame configuration Class1, the descending sub frame in the intersection sub-frame set of Ze Gai community is subframe 4 and subframe 9, and subframe 4 and subframe 9 are set to subframe of mourning in silence.
After the subframe that each descending sub frame in the intersection sub-frame set of each community is set to mourn in silence respectively, and before judging whether each subframe of mourning in silence of each community meets recover condition successively, also comprise, set up directed edge interference figure, calculate the user uplink average signal interference ratio of each community in each intersection subframe, concrete grammar is as follows:
Based on graph theory, each community is modeled as the two-way interference figure of Weight.The up channel be respectively in each intersection subframe of each community sets up directed edge interference figure.
Each intersection subframe sets up directed edge interference figure, hereinafter referred to as interference figure, using cell base station as the summit of interference figure, using the line of minizone as the limit of interference figure, using each community to the weight of the size of the interference value of the up channel of its adjacent cell as limit.
Wherein, using the summit of each community as interference figure, its point set formed is,
V＝{v 1,v 2,...,v M}，
Wherein, v mfor this summit of M, interference figure small area, M is community sum.
Using the limit of the line of minizone as interference figure, its limit collection formed is,
E＝{e 1-2,e 1-3,...,e M-K}，
Wherein, e m-Kfor the limit between community M and community K.
Using each community to the weight of the size of the interference value of the up channel of its adjacent cell as limit, the set that this weight is formed is,
W＝{w 1-2,w 1-3,...,w M-K}，
Wherein, w m-Kfor the weight on the limit between community M and community K, to be also illustrated on any sub-frame of uplink community K to the interference value of the up channel of its adjacent cell M.
Then, total interference value w that the sub-frame of uplink in the intersection sub-frame set of a community m is subject to is determined according to following formula m, comprising:
w l - m = B l × Σ k = 1 n l P k n l + ( 1 - B l ) × A l × P l - m ;
Wherein, w l-mbe the interference value that a community m is subject to its adjacent cell l on this sub-frame of uplink, in interference figure, also represent the weight on limit between a community m and its adjacent cell l, be the uplink interference power that a community m is subject to the user k in its adjacent cell l, the value of k is from 1 to n l, P l-mit is the descending interference power that a community m is subject to its adjacent cell l;
If on this sub-frame of uplink, the subframe type of the adjacent cell l of a community m is sub-frame of uplink, then B l=1; If on this sub-frame of uplink, the subframe type of the adjacent cell l of a community m is descending sub frame, then B l=0 and A l=1; If on this sub-frame of uplink, the subframe type of the adjacent cell l of a community m is subframe of mourning in silence, then B l=0 and A l=0;
According to calculate on this sub-frame of uplink, any community m is subject to the interference value of its each adjacent cell, determine a sub-frame of uplink in the intersection sub-frame set of a community m corresponding on total interference value of being subject to, computing formula is as follows:
w m = Σ l = 1 N w l - m ;
Wherein, w mbe total interference value that a community m is subject on this sub-frame of uplink, in graph theory, also referred to as the in-degree weighted value of summit m, i.e. the weight sum on the limit of all sensing summit m.L=1 to l=N is used to indicate a community m on this sub-frame of uplink, all adjacent cell 1 to adjacent cell N its up channel being produced to interference.
Then, calculate the average signal interference ratio of user uplink on each sub-frame of uplink in the intersection sub-frame set of each community, computational methods are as follows:
Obtain user's average signal power value that base station corresponding to each community receives, and the average signal interference ratio of user uplink on each sub-frame of uplink in the intersection sub-frame set of user's average signal power value of receiving of the base station corresponding according to each community and corresponding total interference value calculation plot.
SIR m = 1 n m × Σ k = 1 n m RSCP k w m ;
Wherein, RSCP kbe the signal power of the user k in a community m, n mbe the number of users of a community m, w mbe total interference value that a community m is subject on a sub-frame of uplink, SIR mit is the average signal interference ratio of the user uplink of a community m on a sub-frame of uplink.
The descending sub frame intersected in sub-frame set is set to subframe of mourning in silence, can ensures that the use of dynamic TDD technology can not produce the interference of intersection subframe, but descending time slot resource can be sacrificed like this, reduce cell downlink throughput.To meet premised on communication quality, judge whether one by one the subframe of mourning in silence of each community to be reverted to descending sub frame, to reach the object improving resource utilization ratio and throughput.
Step 110: judge whether the subframe of mourning in silence of each community meets recover condition, and the subframe of mourning in silence meeting recover condition is reverted to descending sub frame successively; Wherein, recover condition is that one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, and on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold.
Concrete, judge whether the subframe of mourning in silence of each community meets recover condition, comprising successively:
Judge whether each subframe of mourning in silence of respective cell meets recover condition successively according to the priority order from high to low of each community, wherein, priority is used to indicate the upstream traffic demand of community and the summation of downlink traffic demand.
Adopt the following upstream traffic demand of formulae discovery one community m and the summation of downlink traffic demand,
Q m＝(v m_U+v m_D)；
Wherein, v m_Ube the upstream rate demand of a community m, v m_Dthe downstream rate demand of Wei Gai mono-community m.The upstream rate demand of community and the summation of downlink traffic demand larger, the priority of community is higher, more preferentially judges whether the subframe of mourning in silence of this community can revert to descending sub frame.
Judge whether the subframe of mourning in silence of each community meets recover condition, and the subframe of mourning in silence meeting recover condition is reverted to descending sub frame successively.This recover condition is: one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, and on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold.Namely, if the subframe of mourning in silence recovering a community is descending sub frame, adopt the sub-frame configuration after recovering, time the interference that the adjacent cell of this community is subject to is less, mean this recovery operation, little on the adjacent cell impact of this community, then can revert to descending sub frame, according to the sub-frame configuration after recovery, time the interference that the adjacent cell of this community is subject to is larger, mean and this recovery operation affect on the adjacent cell of this community, then can not revert to descending sub frame large.
Concrete, to one of a community mourn in silence subframe recover time, whether the interference that the adjacent cell weighing this community is subject to exceedes setting interference threshold, can judge in the following ways:
One of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, calculates the average signal interference ratio of user uplink of each adjacent cell on the descending sub frame after recovery of a community;
The up average signal interference ratio of counting user is lower than the adjacent cell number of predetermined threshold value;
When determining that the adjacent cell number of the average signal interference ratio of user uplink lower than predetermined threshold value is less than or equal to setting number of cells, determine on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold;
Wherein, before the average signal interference ratio of user uplink reverts to descending sub frame lower than the adjacent cell of predetermined threshold value not included in subframe of mourning in silence of a community, the up average signal interference ratio of its active user is lower than the adjacent cell of predetermined threshold value, the up average signal interference ratio of active user is that one of Jiang mono-community is mourned in silence before subframe reverts to descending sub frame, calculates according to the sub-frame configuration before recovering.
Each subframe cycle of reshuffling is when starting, according to upstream rate demand and the downstream rate demand of any community, also be up-downgoing traffic needs, re-execute sub-frame configuration operation, namely the sub-frame configuration type that each community adopts is redefined, the descending sub frame intersected in sub-frame set is set to subframe of mourning in silence, then according to recover condition, qualified subframe of mourning in silence is reverted to descending sub frame.
In the present embodiment, above-mentioned setting number of cells is defined as 1, namely the average signal interference ratio of user uplink is less than or equal to 1 lower than the adjacent cell number of predetermined threshold value, and the average signal interference ratio of user uplink is lower than before reverting to descending sub frame not included in subframe of mourning in silence in the adjacent cell of predetermined threshold value, the average signal interference ratio of its user uplink is lower than those adjacent cells of predetermined threshold value.Namely, before this subframe of mourning in silence reverts to descending sub frame, the interference that the up channel of some adjacent cells is subject to is larger, the average signal interference ratio of user uplink is lower than predetermined threshold value, so when recovering to mourn in silence subframe, just do not consider these adjacent cells, wherein, predetermined threshold value is according to parameter choose such as network topology, path loss, community user distribution, Adaptive Modulation and Coding access threshold values.
Whether the interference that the adjacent cell weighing this community is subject to exceedes setting interference threshold, except adopting aforesaid way to judge, other parameters can carrying out equivalency transform with setting interference threshold of community can also be adopted to judge.Such as, signal quality, path loss etc. parameter can equivalency transform be setting interference threshold.
Below in conjunction with accompanying drawing, the subframe configuration method of the dynamic TDD interference coordination that the embodiment of the present invention provides is described in detail.
Consult shown in Fig. 2, for the dense deployment of TD-LTE picocell (Pico cell), Pico cell is densely distributed, and number of users is more.Different according to its covering area, minizone up-downgoing traffic carrying capacity difference may be comparatively large, and up-downgoing business is asymmetric mostly.The application of dynamic TDD technology, can better meet user's request, but must be based upon and handle consequent intersection subframe well and disturb and bring on the basis of impact to TD-LTE system performance.
Consult shown in Fig. 3, if community 1 is in uplink on present sub-frame, community 2 is in downlink transfer on present sub-frame.Then the base station of community 1 will be subject to the interference of the base station from community 2.Simultaneously, the downlink transfer of the user equipment (UE) 2 in community 2 can be subject to the interference of the uplink of the edge customer equipment UE 1 of community 1, interference between the base station that the appearance of subframe of namely intersecting easily causes neighbor cell and between user, therefore, when Pico cell dense deployment, if do not suppress the interference between Pico cell, the interference particularly between base station, will cause serious performance loss.In the embodiment of the present invention be for base station between interference carry out dynamic sub-frame configuration.
First, setting initialization condition, set the sub-frame configuration type that the Pico cell employing up-downgoing change-over period is 10ms, the selection of predetermined threshold value corresponds to the grade of TD-LTE system code rate, specifically can see channel quality-signal interference ratio (CQI-SINR) mapping table.The transmission quality that this predetermined threshold value can be able to allow according to network sets flexibly.To ask network transmission quality high, then this predetermined threshold value is set to a less numerical value; To ask network transmission quality low, then this predetermined threshold value is set to a larger numerical value.Arranging the subframe cycle of reshuffling is 20ms.Setting number of cells is set to 1.
Secondly, calculate the up-downgoing duty ratio of each community, such as, the up-downgoing duty ratio of community 1 is the up-downgoing duty ratio of community 2 is the up-downgoing duty ratio of community 3 is the up-downgoing duty ratio of community 4 is
According to the up-downgoing duty ratio of each community, the optimum ascending-descending subframes ratio closest to up-downgoing duty ratio is selected to carry out sub-frame configuration to each community.The up-downgoing duty ratio of community 1 is the ascending-descending subframes ratio of sub-frame configuration type 3, sub-frame configuration type 4 and sub-frame configuration type 5 is respectively the immediate ratio of up-downgoing duty ratio of its small area 1 is therefore, calculate community 1 and adopt sub-frame configuration type 3.Same, community 2 adopts sub-frame configuration type 4, and community 3 adopts sub-frame configuration type 5, and community 4 adopts sub-frame configuration type 3.Reshuffling the cycle in each subframe, determining that subframe 3 and subframe 4 are for intersecting subframe, are set to all descending sub frames in the subframe 3 of 4 communities and subframe 4 position subframe of mourning in silence according to the definition of intersection subframe.As, the subframe 3 of community 1 and subframe 4 position do not have descending sub frame, therefore, does not need to reset; In the subframe 3 of community 2 and subframe 4, subframe 4 is descending sub frames, therefore, subframe 4 is set to subframe of mourning in silence; In like manner, the subframe 3 in community 3 and subframe 4 are set to mourn in silence subframe, community 4 sub-frame configuration constant.
Consult shown in Fig. 4, for 4 Pico cell, for interference figure is set up intersecting on any sub-frame of uplink in sub-frame set in community 1, community 2, community 3 and community 4.Such as, to judge community 2 subframe 4 position on subframe of mourning in silence whether can revert to descending sub frame, then set up this presence of intercell interference figure of subframe before recovery and after recovering that mourn in silence, this presence of intercell interference figure is used to indicate district to be turned down, the adjacent cell in district to be turned down, adjacent cell adjacent cell separately.The user uplink average signal interference ratio of the adjacent cell of calculation plot 2 before recovery and after recovering in subframe 4 respectively.For the adjacent cell 1, w of community 2 1represent the in-degree weighted value on summit 1, be also total interference value that adjacent cell 1 is subject in any intersection subframe, this total interference value is w 2-1, w 3-1with w 4-1and.The average signal interference ratio of user uplink of adjacent cell 1 is average signal power and the w of all users in the adjacent cell 1 that receives of the base station of adjacent cell 1 correspondence 1ratio.
Select each community to carry out subframe recovery successively according to native region priority, judge whether each subframe of mourning in silence can revert to descending sub frame.Rule of judgment is, when any one subframe of mourning in silence of the community of carrying out subframe recovery reverts to descending sub frame, the average signal interference ratio of user uplink of its adjacent cell is less than or equal to 1 lower than the adjacent cell number of predetermined threshold value, namely, only has the average signal interference ratio of the user uplink of an adjacent cell at the most lower than predetermined threshold value, wherein, do not comprise those before recovery, the average signal interference ratio of its user uplink is lower than the adjacent cell of predetermined threshold value.
Adjust other subframes of mourning in silence of this community in the same way.Each when sub-frame configuration changes, after the subframe that is about to mourn in silence reverts to descending sub frame, interference figure be upgraded, recalculate parameters.Same, adjust each subframe of mourning in silence of each community in the same way, until all subframes of mourning in silence of the complete all communities of poll.
Consult shown in Fig. 5, the detailed process of the subframe configuration method of the interference coordination in the embodiment of the present invention is as follows:
Step 5000: according to each community up-downgoing traffic needs, determine the sub-frame configuration type of each community;
Step 5010: the descending sub frame in the intersection sub-frame set of each community is set to subframe of mourning in silence;
Step 5020: set up interference figure;
Step 5030: the order of successively decreasing according to native region priority is all ranking cells, and from the community that priority is the highest poll;
Step 5040: judge whether the complete all communities of poll, if so, then performs step 5050, otherwise, perform step 5060;
Step 5050: terminate sub-frame configuration process;
Step 5060: select next community;
Step 5070: all subframes of mourning in silence judging whether the complete current area of poll, if so, then performs step 5040, otherwise, perform step 5080;
Step 5080: select the next one to mourn in silence subframe;
Step 5090: judge whether current subframe of mourning in silence meets recover condition, if so, then performs step 5100, otherwise, perform step 5070;
Step 5100: revert to descending sub frame;
Step 5110: upgrade interference figure, continues to perform step 5070.
Consult shown in Fig. 6, can be realized by the dynamic TDD interference coordination device of following introduction in the scheme of above-mentioned sub-frame configuration, this device comprises setting and recovers module with memory module, sub-frame configuration module, subframe of mourning in silence.This dynamic TDD interference coordination device can be positioned over macro base station, the dynamic subframe configuration of all Pico cell in centralized management macro base station coverage.Such as, in sub-frame configuration, dynamic TDD interference coordination device can by Pico cell interactive user signal power, upstream rate demand summation, downstream rate demand summation, cell downlink interference power etc. the parameter of X2 interface and its covering.
Setting and memory module are used for presetting subframe and reshuffle cycle and predetermined threshold value.Sub-frame configuration module is that optimum sub-frame configuration type is selected in each community according to community up-downgoing duty ratio, and in advance when each subframe cycle of reshuffling starts, the descending sub frame in the intersection sub-frame set of all communities is set to subframe of mourning in silence.Subframe of mourning in silence is recovered module and is judged whether each subframe of mourning in silence can revert to descending sub frame according to recover condition.
Based on same inventive concept, according to the subframe configuration method of the interference coordination that the above embodiment of the present invention provides, correspondingly, another embodiment of the present invention additionally provides a kind of sub-frame configuration device of interference coordination, this apparatus structure schematic diagram as shown in Figure 7, specifically comprises:
Dispensing unit 700, for when carrying out sub-frame configuration for each community, respectively each descending sub frame in the intersection sub-frame set of each community is set to subframe of mourning in silence, wherein, sub-frame set of intersecting comprises at least one intersection subframe, and subframe of intersecting is that in the radio frames of same structure, in different sub-frame configuration types, ascending-descending subframes configures different subframes;
Recovery unit 710, for judging whether the subframe of mourning in silence of each community meets recover condition successively, the subframe of mourning in silence meeting recover condition is reverted to descending sub frame, wherein, recover condition is that one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold.
Device also comprises: computing unit 720, for determining the up-downgoing duty ratio of respective cell according to the upstream rate demand of each community and downstream rate demand, and determines according to the up-downgoing duty ratio of each community the sub-frame configuration type that respective cell adopts.
Computing unit 720, also for: after the subframe that each descending sub frame in the intersection sub-frame set of each community is set to mourn in silence respectively, before judging whether the subframe of mourning in silence of each community meets recover condition successively, calculate total interference value that each sub-frame of uplink corresponding in the intersection sub-frame set of each community is subject to, obtain user's average signal power value that base station corresponding to each community receives, and the average signal interference ratio of user uplink on each sub-frame of uplink in the intersection sub-frame set of the user's average signal power value received according to base station corresponding to each community and corresponding total interference value calculation plot.
Computing unit 720, specifically for determining total interference value w that the sub-frame of uplink in the intersection sub-frame set of a community m is subject to according to following formula m:
w l - m = B l × Σ k = 1 n l P k n l + ( 1 - B l ) × A l × P l - m ;
Wherein, w l-mbe the interference value that a community m is subject to its adjacent cell l on a sub-frame of uplink, P kbe the uplink interference power that a community m is subject to the user k in its adjacent cell l, P l-mit is the descending interference power that a community m is subject to its adjacent cell l;
If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is sub-frame of uplink, then B l=1; If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is descending sub frame, then B l=0 and A l=1; If on a sub-frame of uplink, the subframe type of the adjacent cell l of a community m is subframe of mourning in silence, then B l=0 and A l=0;
w m = Σ l = 1 N w l - m ;
Wherein, w mbe total interference value that a community m is subject on a sub-frame of uplink, l=1 to l=N is used to indicate a community m on a sub-frame of uplink, all adjacent cell 1 to adjacent cell N its up channel being produced to interference.
Recovery unit 710, specifically for:
Judge whether each subframe of mourning in silence of respective cell meets recover condition successively according to the priority order from high to low of each community, wherein, priority is used to indicate the upstream traffic demand of community and the summation of downlink traffic demand.
Recovery unit 710, specifically for:
One of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, calculates the average signal interference ratio of user uplink of each adjacent cell on the descending sub frame after recovery of a community;
The up average signal interference ratio of counting user is lower than the adjacent cell number of predetermined threshold value;
When determining that the adjacent cell number of the average signal interference ratio of user uplink lower than predetermined threshold value is less than or equal to setting number of cells, determine on descending sub frame after recovery, the interference level that the adjacent cell of a community is subject to is no more than setting interference threshold;
Wherein, before the average signal interference ratio of user uplink reverts to descending sub frame lower than the adjacent cell of predetermined threshold value not included in subframe of mourning in silence of a community, the up average signal interference ratio of its active user is lower than the adjacent cell of predetermined threshold value, the up average signal interference ratio of active user is that one of Jiang mono-community is mourned in silence before subframe reverts to descending sub frame, calculates according to the sub-frame configuration before recovering.
In sum, the scheme that the embodiment of the present invention provides, for the situation of community dense deployment, can carry out effective interference coordination, by the method for the subframe that is set to by the descending sub frame intersected in subframe to mourn in silence, the uplink of downlink transfer to neighbor cell reducing community causes the problem of interference.Further, in order to increase downlink throughput capacity, after recovering, disturb minimum principle, subframe of mourning in silence reverts to descending sub frame again according to recover condition, to ensure the utilance of downlink resource.The sub-frame configuration scheme of the interference coordination that the embodiment of the present invention provides is applicable to TD-LTE system, but is not limited only to TD-LTE system, and the method for this solution intersection subframe interference can be applied in other TDD system equally.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (12)

1. a subframe configuration method for interference coordination, is characterized in that, described method comprises:
When carrying out sub-frame configuration for each community, respectively each descending sub frame in the intersection sub-frame set of described each community is set to subframe of mourning in silence, wherein, described intersection sub-frame set comprises at least one intersection subframe, and described intersection subframe is that in the radio frames of same structure, in different sub-frame configuration types, ascending-descending subframes configures different subframes;
Judge whether the subframe of mourning in silence of each community meets recover condition successively, the subframe of mourning in silence meeting described recover condition is reverted to descending sub frame, wherein, described recover condition is that one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, on descending sub frame after recovery, the interference level that the adjacent cell of a described community is subject to is no more than setting interference threshold.
2. the method for claim 1, is characterized in that, before the subframe that is set to by each descending sub frame in the intersection sub-frame set of described each community respectively to mourn in silence, also comprises:
Determine the up-downgoing duty ratio of respective cell according to the upstream rate demand of each community and downstream rate demand, and determine according to the up-downgoing duty ratio of each community the sub-frame configuration type that respective cell adopts.
3. method as claimed in claim 1 or 2, it is characterized in that, after the subframe that each descending sub frame in the intersection sub-frame set of described each community is set to mourn in silence respectively, before judging whether the subframe of mourning in silence of each community meets recover condition successively, also comprise:
Calculate total interference value that each sub-frame of uplink corresponding in the intersection sub-frame set of each community is subject to;
Obtain user's average signal power value that base station corresponding to each community receives, and the average signal interference ratio of user uplink on user's average signal power value of receiving of the base station corresponding according to described each community and corresponding described total interference value calculate in the intersection sub-frame set of described community each sub-frame of uplink.
4. method as claimed in claim 3, is characterized in that, determine total interference value w that the sub-frame of uplink in the intersection sub-frame set of a community m is subject to according to following formula m, comprising:
w l - m = B l × Σ k = 1 n l P k n l + ( 1 - B l ) × A l × P l - m ;
Wherein, w l-mfor a described community m is subject to the interference value of its adjacent cell l on a described sub-frame of uplink, P kfor a described community m is subject to the uplink interference power of the user k in its adjacent cell l, P l-mfor a described community m is subject to the descending interference power of its adjacent cell l;
If on a described sub-frame of uplink, the subframe type of the adjacent cell l of a described community m is sub-frame of uplink, then B l=1; If on a described sub-frame of uplink, the subframe type of the adjacent cell l of a described community m is descending sub frame, then B l=0 and A l=1; If on a described sub-frame of uplink, the subframe type of the adjacent cell l of a described community m is subframe of mourning in silence, then B l=0 and A l=0;
w m = Σ l = 1 N w l - m ;
Wherein, w mfor total interference value that a described community m is subject on a described sub-frame of uplink, l=1 to l=N is used to indicate a described community m on a described sub-frame of uplink, all adjacent cell 1 to adjacent cell N its up channel being produced to interference.
5. method as claimed in claim 1 or 2, is characterized in that, judge whether the subframe of mourning in silence of each community meets recover condition, comprising successively:
Judge whether each subframe of mourning in silence of respective cell meets recover condition successively according to the priority order from high to low of each community, wherein, described priority is used to indicate the upstream traffic demand of community and the summation of downlink traffic demand.
6. method as claimed in claim 4, is characterized in that, one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, and on descending sub frame after recovery, the interference level that the adjacent cell of a described community is subject to is no more than setting interference threshold, comprising:
If after subframe of mourning in silence of a described community reverts to descending sub frame, calculate the average signal interference ratio of user uplink of each adjacent cell on the descending sub frame after recovery of a described community;
Add up the adjacent cell number of the average signal interference ratio of described user uplink lower than predetermined threshold value;
When determining that the adjacent cell number of the average signal interference ratio of described user uplink lower than predetermined threshold value is less than or equal to setting number of cells, determine on descending sub frame after recovery, the interference level that the adjacent cell of a described community is subject to is no more than setting interference threshold;
Wherein, before the average signal interference ratio of described user uplink reverts to descending sub frame lower than the adjacent cell of predetermined threshold value not included in subframe of mourning in silence of a described community, the up average signal interference ratio of its active user is lower than the adjacent cell of described predetermined threshold value, the up average signal interference ratio of described active user is before subframe of mourning in silence of a described community reverts to descending sub frame, calculates according to the sub-frame configuration before recovering.
7. a sub-frame configuration device for interference coordination, is characterized in that, described device comprises:
Dispensing unit, for when carrying out sub-frame configuration for each community, respectively each descending sub frame in the intersection sub-frame set of described each community is set to subframe of mourning in silence, wherein, described intersection sub-frame set comprises at least one intersection subframe, and described intersection subframe is that in the radio frames of same structure, in different sub-frame configuration types, ascending-descending subframes configures different subframes;
Recovery unit, for judging whether the subframe of mourning in silence of each community meets recover condition successively, the subframe of mourning in silence meeting described recover condition is reverted to descending sub frame, wherein, described recover condition is that one of Ruo Jiang mono-community is mourned in silence after subframe reverts to descending sub frame, on descending sub frame after recovery, the interference level that the adjacent cell of a described community is subject to is no more than setting interference threshold.
8. device as claimed in claim 7, it is characterized in that, described device also comprises:
Computing unit, for determining the up-downgoing duty ratio of respective cell according to the upstream rate demand of each community and downstream rate demand, and determines according to the up-downgoing duty ratio of each community the sub-frame configuration type that respective cell adopts.
9. device as claimed in claim 7 or 8, it is characterized in that, described computing unit, also for: after the subframe that each descending sub frame in the intersection sub-frame set of described each community is set to mourn in silence respectively, before judging whether the subframe of mourning in silence of each community meets recover condition successively, calculate total interference value that each sub-frame of uplink corresponding in the intersection sub-frame set of each community is subject to, obtain user's average signal power value that base station corresponding to each community receives, and the average signal interference ratio of user uplink on the user's average signal power value received according to base station corresponding to described each community and corresponding described total interference value calculate in the intersection sub-frame set of described community each sub-frame of uplink.
10. device as claimed in claim 9, is characterized in that, described computing unit, specifically for determining total interference value w that the sub-frame of uplink in the intersection sub-frame set of a community m is subject to according to following formula m:
w l - m = B l × Σ k = 1 n l P k n l + ( 1 - B l ) × A l × P l - m ;
Wherein, w l-mfor a described community m is subject to the interference value of its adjacent cell l on a described sub-frame of uplink, P kfor a described community m is subject to the uplink interference power of the user k in its adjacent cell l, P l-mfor a described community m is subject to the descending interference power of its adjacent cell l;
If on a described sub-frame of uplink, the subframe type of the adjacent cell l of a described community m is sub-frame of uplink, then B l=1; If on a described sub-frame of uplink, the subframe type of the adjacent cell l of a described community m is descending sub frame, then B l=0 and A l=1; If on a described sub-frame of uplink, the subframe type of the adjacent cell l of a described community m is subframe of mourning in silence, then B l=0 and A l=0;
w m = Σ l = 1 N w l - m ;
Wherein, w mfor total interference value that a described community m is subject on a described sub-frame of uplink, l=1 to l=N is used to indicate a described community m on a described sub-frame of uplink, all adjacent cell 1 to adjacent cell N its up channel being produced to interference.
11. devices as claimed in claim 7 or 8, is characterized in that, described recovery unit, specifically for:
Judge whether each subframe of mourning in silence of respective cell meets recover condition successively according to the priority order from high to low of each community, wherein, described priority is used to indicate the upstream traffic demand of community and the summation of downlink traffic demand.
12. devices as claimed in claim 10, is characterized in that, described recovery unit, specifically for:
If after subframe of mourning in silence of a described community reverts to descending sub frame, calculate the average signal interference ratio of user uplink of each adjacent cell on the descending sub frame after recovery of a described community;
Add up the adjacent cell number of the average signal interference ratio of described user uplink lower than predetermined threshold value;
When determining that the adjacent cell number of the average signal interference ratio of described user uplink lower than predetermined threshold value is less than or equal to setting number of cells, determine on descending sub frame after recovery, the interference level that the adjacent cell of a described community is subject to is no more than setting interference threshold;
Wherein, before the average signal interference ratio of described user uplink reverts to descending sub frame lower than the adjacent cell of predetermined threshold value not included in subframe of mourning in silence of a described community, the up average signal interference ratio of its active user is lower than the adjacent cell of described predetermined threshold value, the up average signal interference ratio of described active user is before subframe of mourning in silence of a described community reverts to descending sub frame, calculates according to the sub-frame configuration before recovering.
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