CN102612040B - Method and device for positioning interference among base stations in time division duplex (TDD) mobile communication system - Google Patents

Abstract

The invention provides a method for positioning interference among base stations in a time division duplex (TDD) mobile communication system. The method comprises the following steps of classifying interference source base stations into a plurality of groups; allocating a uniform feature code to all base stations in each group; uniformly sending corresponding feature codes by all the interference source base stations at the moment (t) in the downlink time slots of the interference source base stations, matching received signals by interfered base stations through the feature codes of each group, determining an interference production quantization value of each group, comparing the interference production quantization value with a preset threshold value, and determining strong interference groups and weak interference groups; judging whether the number of base stations in each strong interference group is 1 by each interfered base station, if so, ending the flow, otherwise, increasing the power of the strong interference groups and/or reducing the power of other groups, and returning the step of allocating the uniform feature code. The invention also provides a device for positioning the interference among the base stations in the time division duplex (TDD) mobile communication system.

Description

Inter base station interference localization method and device in TDD mobile communication system

Technical field

The present invention relates to mobile communication technology, particularly relate to interference positioning method and device between a kind of time division duplex (TDD) base stations in mobile communication system.

Background technology

For TDD system (as TD-SCDMA, WiMAX, TD-LTE etc.); its up-downgoing uses same frequency range; up-downgoing conversion adopts protection interval to protect, and avoid the interference between base station, such as neighbor cell downstream signal produces interference to this cell uplink signal.

But; due to electromagnetic wave propagation characteristic; in some scenarios (factor such as good, atmospheric duct effects of air borne environment); the downstream signal of base station likely propagates into place very far away (tens kilometers even hundreds of kilometer); the time delay of remote signaling is now often caused to exceed protection interval; cause the downstream signal of base station can interfere with the upward signal of telepoint base station, cause the up end of base station to make an uproar degradation problem under lifting, sensitivity.This interference is one of principal element having a strong impact on tdd communication system performance.

Fig. 1 is the principle schematic of inter base station interference.Base station A and base station B is telepoint base station, and base station C is this cell base station.Due to path delay, the signal that base station A arrives base station C has a time delay τ ₁, the signal that base station B arrives base station C has a time delay τ ₂.If described time delay is greater than protection interval (GP); subscriber equipment (UE) in the community of then base station C is while sending upward signal to base station C; base station C can receive the downstream signal that base station A or base station B sends, thus cause the up end of base station C make an uproar lifting, sensitivity decline.

The important feature of this interference is: interference distance is far away and superposition is accumulated in many base stations.Fig. 2 gives the telepoint base station interference citing of a TD-SCDMA system.What provide in figure is in the sampling without ascending time slot during business, and abscissa is chip (chip) number (TD-SCDMA system sample rate is 1.28Mbps, and every chip is 0.78125us), and ordinate represents interference power.Level is made an uproar for-109dBm in the end of base station self.Visible, the interference caused due to telepoint base station is made an uproar considerably beyond the end of base station level.And telepoint base station has interfered with more than 900chip, illustrate that the base station beyond 200 kilometers creates interference to this base station.

Eliminate inter base station interference, first will accomplish identification interference source.But because above-mentioned inter base station interference has multistation accumulation superposition and scope is comparatively wide, current means are difficult to accurately locate interference source.

Summary of the invention

The invention provides inter base station interference localization method and device in a kind of TDD mobile communication system, effective location can be carried out to causing the interference source of inter base station interference.

Inter base station interference localization method in a kind of TDD mobile communication system that the embodiment of the present invention proposes, comprises the steps:

A, interference source base station is divided into several groupings;

B, for the unified condition code of all base station assigns in each grouping one; The condition code that the base station assigns of different grouping is different;

C, send its corresponding condition code in all interference source base station of moment t its descending time slot is unified, interfered base station receives the condition code that interference source base station sends;

D, interfered base station mate received signal by using the condition code of each grouping, determine that each grouping produces the quantized value of interference, this quantized value and the threshold value pre-set are compared, and determine strong jamming grouping and weak jamming grouping;

E, judge in each strong jamming grouping, whether the base station number that comprises is 1, if so, then process ends; Otherwise the power ascension divide into groups described strong jamming and/or other packet power reduced, is subdivided into less grouping further by interference source base station, and returns step B.

Preferably, before described steps A, comprise further: all base stations frame number is carried out synchronously.

Preferably, steps A for: relative to the antenna directional angle of interfered base station, interference source base station is divided into several groupings according to the geographic area residing for interference source base station or interference source base station; Wherein, (n-1)th grade of grouping comprises more than one n-th grade of grouping.

Preferably, the auto-correlation of the skew of described condition code is zero correlation or weak relevant, and the cross-correlation of different condition codes is zero correlation or weak relevant.

Preferably, described condition code is periodicity zero correlation window code.

Preferably, described step B comprises:

B1, be N for length _zCzadoff-Chu sequence, define its u ^th(0≤u≤N _zC-2) root sequence is: 0≤n≤N _zC-1;

B2, by a root sequence according to formula x _u,v(n)=x _u((n+C _v) modN _zC) generate the Zadoff-Chu code that a group has zero correlative window characteristic, wherein C _v=vN _cS, n _cSfor zero correlation window length;

B3, choose the Zadoff-Chu code assign ment of different group to the grouping of different interference sources, or, choose different Zadoff-Chu code assign ment in same group to the grouping of different interference sources.

Preferably, comprise further in unified its corresponding condition code that sends of its descending time slot in the interference source base station that moment t is all described in step C:

The descending time slot adjacent at protection interval sends condition code, adds Cyclic Prefix before described condition code.

Preferably, described condition code is aperiodicity zero correlation window mutual-complementing code.

Preferably, comprise further in unified its corresponding condition code that sends of its descending time slot in the interference source base station that moment t is all described in step C

Send aperiodicity zero correlation window mutual-complementing code at the descending time slot that protection interval is adjacent, and before the C portion and S portion of described aperiodicity zero correlation window mutual-complementing code, add son protection interval respectively.

Preferably, interfered base station described in step C receive receive mode that the condition code that sends of interference source base station adopts for following any one:

Interfered base station receives at the ascending time slot adjacent with protection interval;

Interfered base station receives the signal of protection interval ascending time slot; Or

Interfered base station is set to entirely receive pattern, receives the signal of descending time slot and ascending time slot simultaneously.

Preferably, interfered base station described in step D mates received signal by using the condition code of each grouping, determines that the quantized value that each grouping produces interference comprises:

Interfered base station carries out channel estimating to each condition code received;

Channel estimating is carried out for use different characteristic code and obtains corresponding envelope, the mean value of envelope is produced the quantized value of interference as corresponding interference source grouping.

The embodiment of the present invention also proposes inter base station interference positioner in a kind of TDD mobile communication system, and described device is positioned at interfered base station side, comprising:

Condition code configuration module, for interference source base station being divided into several groupings, for the condition code that all base station assigns in each grouping one are unified; The condition code that the base station assigns of different grouping is different, and after judge module sends the instruction promoting transmitted power or the instruction reducing transmitted power, interference source base station is subdivided into less grouping further;

Condition code receiver module, for receiving the condition code that interference source base station sends at particular moment t;

Matching module, for using the condition code of each grouping to mate received signal, determining that each grouping produces the quantized value of interference, this quantized value and the threshold value pre-set being compared, determine strong jamming grouping and weak jamming grouping;

Judge module, for judging whether the base station number comprised in determined each strong jamming grouping of described matching module is 1, if not, the instruction promoting transmitted power is sent to the interference source base station in described strong jamming grouping, and/or, send to the interference source base station in other groupings the instruction reducing transmitted power.

Preferably, described condition code configuration module comprises:

Interference source grouped element, for being divided into several grouping relative to the antenna directional angle of interfered base station by interference source base station according to the geographic area residing for interference source base station or interference source base station; Wherein, (n-1)th grade of grouping comprises more than one n-th grade of grouping;

Condition code dispensing unit, for the condition code that all base station assigns one in each grouping of being divided into for interference source grouped element are unified; The condition code that the base station assigns of different grouping is different.

Preferably, the auto-correlation of the skew of the condition code that described condition code dispensing unit configures is zero correlation or weak relevant, and the cross-correlation of different condition codes is zero correlation or weak relevant.

Preferably, described condition code is periodicity zero correlation window code.

Preferably, described condition code dispensing unit comprises:

Root sequence definition subelement, for being N for length _zCzadoff-Chu sequence, define its u ^th(0≤u≤N _zC-2) root sequence is: 0≤n≤N _zC-1;

ZC code generates subelement, for the root sequence defined according to described sequence definition subelement, by formula x _u,v(n)=x _u((n+C _v) modN _zC) generate the Zadoff-Chu code that a group has zero correlative window characteristic, wherein C _v=vN _cS, n _cSfor zero correlation window length;

ZC code assign ment subelement, for choosing the Zadoff-Chu code assign ment of difference group to the grouping of different interference sources, or the different Zadoff-Chu code assign ment chosen in same group divide into groups to different interference sources.

Preferably, described condition code is aperiodicity zero correlation window mutual-complementing code.

Preferably, the receive mode that adopts of described condition code receiver module for following any one:

Interfered base station receives at the ascending time slot adjacent with protection interval;

Interfered base station receives the signal of protection interval ascending time slot; Or

Interfered base station is set to entirely receive pattern, receives the signal of descending time slot and ascending time slot simultaneously.

Preferably, described matching module comprises:

Channel estimating unit, for carrying out channel estimating to each condition code received;

Quantifying unit, carries out channel estimating for use different characteristic code and obtains corresponding envelope, the mean value of envelope is produced the quantized value of interference as corresponding interference source grouping.

As can be seen from the above technical solutions, interference source base station sends condition code at the descending time slot of synchronization, and interfered base station identifies condition code, determines the grouping belonging to interference source base station, thus realizes the location to interference source.Use the present invention program, the position of interference source between TDD system base station can be determined exactly, thus for taking further interference suppression measure to provide foundation.

Accompanying drawing explanation

Fig. 1 is the principle schematic of inter base station interference;

Fig. 2 is the schematic diagram of the telepoint base station interference of a TD-SCDMA system;

Fig. 3 is the inter base station interference localization method realization flow figure that the embodiment of the present invention proposes;

Fig. 4 a is the auto-correlation coefficient schematic diagram of Zadoff-Chu code;

Fig. 4 b be same root sequence generate Zadoff-Chu sequence between auto-correlation and their cross correlation schematic diagram;

Fig. 4 c is the their cross correlation schematic diagram between the Zadoff-Chu sequence of different root sequence generation;

The process schematic diagram of interference source base station and interfered base station when Fig. 5 is periodic zero (weak) associated window code;

Fig. 6 a is the signal schematic representation of 500 interference source superpositions;

The result schematic diagram that Fig. 6 b mates signal shown in Fig. 6 a for using the condition code of same group;

The result schematic diagram that Fig. 6 c mates signal shown in Fig. 6 a for using the condition code of different group;

The Received signal strength schematic diagram that Fig. 7 a causes for zones of different Signal averaging;

Fig. 7 b carries out the result schematic diagram of mating for using signal shown in root sequence pair Fig. 7 a;

Fig. 8 is the production method schematic diagram of zero correlation window mutual-complementing code;

Fig. 9 a is the autocorrelation haracter linearity curve of zero correlation window mutual-complementing code;

Fig. 9 b is the correlation properties curve between code1 and code2;

Fig. 9 c is the correlation properties curve between code1 and code3;

Fig. 9 d is the correlation properties curve between code1 and code5;

Figure 10 a is the process schematic diagram for periodicity zero correlation window code;

Figure 10 b is the process schematic diagram for aperiodicity zero correlation window mutual-complementing code.

Embodiment

Generally, the far-end interference that base station is subject to is by the superposition (tens to hundreds of) of numerous telepoint base station downstream signal, is difficult to a step and orients interference base station.The method that the present invention program adopts classification to locate, its inter base station interference localization method realization flow as shown in Figure 3, comprises the steps:

Step 301: all base stations frame number in TDD mobile communication system is carried out synchronously.

Step 302: interference source base station is divided into several groupings.Such as, can divide relative to the antenna directional angle of interfered base station or other standards according to the geographic area residing for interference source base station, interference source base station.

It should be noted that, the grouping of described interference source base station is the process of a continuous classification refinement, (n-1)th grade of grouping may comprise more than one n-th grade of grouping, each grouping is progressively reduced, as from city, certain azimuthal base station group in city, some base stations of certain regional area, until refine to certain base station.

Step 303: for all base stations in each grouping, distributes a unified condition code, the condition code that the base station assigns of different grouping is different.

Step 304: at certain unified moment (certain frame number of specifying), all interference source base stations are in its corresponding condition code of the unified transmission of its descending time slot; And interfered base station is at the ascending time slot Received signal strength of synchronization or interfered base station is placed in accepting state at the duration of this moment whole frame, the hangover signal that the signal of reception comprises telepoint base station adds the thermal noise of interfered base station this locality.

Step 305: interfered base station mates received signal by using the condition code of each grouping, can determine that each grouping produces the quantized value of interference, this quantized value and the threshold value pre-set are compared, strong jamming grouping and weak jamming grouping can be determined.

Step 306: judge in each strong jamming grouping, whether the base station number that comprises is 1, if so, then process ends; Otherwise, perform step 307.

Step 307: power ascension strong jamming divided into groups or other packet power reduced, or both combine simultaneously, to improve the judgement accuracy of next stage, can be subdivided into less grouping further like this, then return step 303.

In order to distinguish different interference source regions better, choosing of condition code is most important.In order to reach preferably implementation result, choosing of condition code should follow following principle:

A, condition code should have good autocorrelation performance, i.e. the auto-correlation of its skew is zero correlation or weak relevant.

For condition code, can selection cycle zero (weak) associated window or aperiodicity zero (weak) associated window code.

For a condition code c=[c ₁c ₂c _n], its periodicity auto-correlation is defined as:

$R\left(\mathrm{\τ}\right)=\left\{\begin{array}{c}\frac{1}{N}(\underset{i=\mathrm{\τ}+1}{\overset{N}{\mathrm{\Σ}}}{c}_i\·c_{i-\mathrm{\τ}}^{*}+\underset{i=1}{\overset{\mathrm{\τ}}{\mathrm{\Σ}}}{c}_i\·c_{N-\mathrm{\τ}+i}^{*}),\mathrm{\τ}\≥0\\ \frac{1}{N}(\underset{i=1}{\overset{N-\mathrm{\τ}}{\mathrm{\Σ}}}{c}_i\·c_{i+\mathrm{\τ}}^{*}+\underset{i=N-\mathrm{\τ}+1}{\overset{N}{\mathrm{\Σ}}}{c}_i\·c_{i-N+\mathrm{\τ}}^{*}),\mathrm{\τ}\≥0\end{array}\right.---\left(1\right)$

Its, auto-correlation was defined as aperiodic:

$R\left(\mathrm{\τ}\right)=\left\{\begin{array}{c}\frac{1}{N}\underset{i=\mathrm{\τ}+1}{\overset{N}{\mathrm{\Σ}}}{c}_i\·c_{i-\mathrm{\τ}}^{*},\mathrm{\τ}\≥0\\ \frac{1}{N}\underset{i=1}{\overset{N-\mathrm{\τ}}{\mathrm{\Σ}}}{c}_i\·c_{i+\mathrm{\τ}}^{*},\mathrm{\τ}\≥0\end{array}\right.---\left(2\right)$

B, different condition codes should have good their cross correlation, and namely its cross-correlation is zero correlation or weak relevant.

For two condition code c ₁=[c ₁₁c ₁₂c _1N], c ₂=[c ₂₁c ₂₂c _2N], its periodicity cross-correlation is defined as:

$R_{12}\left(\mathrm{\τ}\right)=\left\{\begin{array}{c}\frac{1}{N}(\underset{i=\mathrm{\τ}+1}{\overset{N}{\mathrm{\Σ}}}{c}_{1,i}\·c_{2,i-\mathrm{\τ}}^{*}+\underset{i=1}{\overset{\mathrm{\τ}}{\mathrm{\Σ}}}{c}_{1,i}\·c_{2,N-\mathrm{\τ}+i}^{*}),\mathrm{\τ}\≥0\\ \frac{1}{N}(\underset{i=1}{\overset{N-\mathrm{\τ}}{\mathrm{\Σ}}}{c}_{1,i}\·c_{2,i+\mathrm{\τ}}^{*}+\underset{i=N-\mathrm{\τ}+1}{\overset{N}{\mathrm{\Σ}}}{c}_{1,i}\·c_{2,i-N+\mathrm{\τ}}^{*}),\mathrm{\τ}\≥0\end{array}\right.---\left(3\right)$

Its aperiodicity cross-correlation is defined as:

$R_{12}\left(\mathrm{\τ}\right)=\left\{\begin{array}{c}\frac{1}{N}\underset{i=\mathrm{\τ}+1}{\overset{N}{\mathrm{\Σ}}}{c}_{1,i}\·c_{2,i-\mathrm{\τ}}^{*},\mathrm{\τ}\≥0\\ \frac{1}{N}\underset{i=1}{\overset{N-\mathrm{\τ}}{\mathrm{\Σ}}}{c}_{2,i}\·c_{2,i+\mathrm{\τ}}^{*},\mathrm{\τ}\≥0\end{array}\right.---\left(4\right)$

Provide the condition code Choice that two kinds meet above-mentioned feature below, but this patent is not limited to described condition code, any sequence with above-mentioned feature all can be applied.

1), Zadoff-Chu sequence

Be N for length _zCzadoff-Chu sequence, first define its u ^th(0≤u≤N _zC-2) root sequence is:

$x_u\left(n\right)=e^{-j\frac{\mathrm{\πun}(n+1)}{N_{\mathrm{ZC}}}},0\≤n\≤N_{\mathrm{ZC}}-1---\left(5\right)$

The Zadoff-Chu code that one group has zero correlative window characteristic can be generated by a root sequence:

x _u,v(n)＝x _u((n+C _v)modN _ZC) (6)

Wherein C _v=vN _cS, n _cSfor zero correlation window length.

Fig. 4 a is the auto-correlation coefficient schematic diagram of Zadoff-Chu code.Have zero correlative window characteristic between the sequence that same root sequence generates, it with the auto-correlation in group and their cross correlation as shown in Figure 4 b.Between the sequence that different root sequence generates, there is constant amplitude their cross correlation.The Cross-correlations of Sample Sequences of different group as illustrated in fig. 4 c.

During periodic zero (weak) associated window code, as shown in Figure 5, for interference source base station, send the condition code of distributing, consider delay spread simultaneously, add corresponding Cyclic Prefix and protect; And for interfered base station, then use each condition code to carry out channel estimating, judge which interference source is grouped into the strongest interference source.

For choosing of Zadoff-Chu code, two kinds of methods can be had to choose:

(1) the Zadoff-Chu code assign ment of different group, is chosen to the grouping of different interference sources.This scheme is comparatively applicable to location interference source base station and derives from which city, each city can be distributed the sequence of a different group, in disturbed website image data, Zadoff-Chu is used to mate respectively, when using interference source sequence to mate, interference envelope can be matched, otherwise the result after coupling is still white noise.

Provide the signal (as shown in Figure 6 a) of 500 interference source superposition below, and carry out the result (as shown in Fig. 6 b and Fig. 6 c) of mating by different sequences.Can find out, use the condition code of same group to carry out coupling and there will be interference envelope, as shown in Figure 6 b; And use the sequences match result of different group to there will not be interference envelope, as fig. 6 c.

(2), choose different Zadoff-Chu code assign ment in same group to the grouping of different interference sources, this scheme is comparatively applicable to distinguish the interference source base station in the zones of different of incity, same city, until individual base stations/sector.

Because a city generally has multiple region and all can produce interference, now can use the different sequence identifier regionals in same group, use root sequence to mate at interfered base station, the interference envelope that multiple intensity is different can be produced, represent the power that zones of different produces interference respectively.The Received signal strength that Fig. 7 a causes for zones of different Signal averaging, Fig. 7 b is the result using root sequences match.

2) zero correlation window mutual-complementing code

2000, Li Daoben professor proposed zero correlation window mutual-complementing code, its production method as shown in Figure 8, wherein $\left[\begin{array}{cc}{C}_1& S_1\\ C_2& S_2\end{array}\right]=\left[\begin{array}{cc}+& +\\ +& -\end{array}\right].$

For the code word of length N, N number of code with zero correlative window characteristic can be produced altogether.Code1, code2, code3 represent first, second and the 3rd code word in N number of code word respectively.Fig. 9 a is the autocorrelation haracter linearity curve of zero correlation window mutual-complementing code, and Fig. 9 b is the correlation properties curve between code1 and code2, and Fig. 9 c is the correlation properties curve between code1 and code3, and Fig. 9 d is the correlation properties curve between code1 and code5.

This mutual-complementing code has zero correlative window characteristic.Can use each zero correlation window mutual-complementing code as condition code to characterize the base station in the grouping of each interference source, interfered base station receives simultaneously, then carries out coupling by corresponding condition code and is correlated with, determine to disturb the strongest region/or base station.

For the condition code in the present invention program, be not limited to above-mentioned two kinds of zero correlation window codes, any condition code with similar zero (weak) associated window characteristic all can be applied.

Illustrate that the condition code of interference source base station sends by the following examples.

When an interference source base station is endowed a condition code, the unified frame number of specifying, it selects the descending time slot protection interval is adjacent to send condition code, and the length of condition code is any.

For the transmission of periodicity zero correlation window code, Cyclic Prefix protection need be added, as shown in Figure 10 a.

For the transmission of aperiodicity zero correlation window mutual-complementing code, son protection interval need be added respectively before C portion and S portion, as shown in fig. lob.

The reception judgement of interfered base station is described by the following examples.

The unified frame number of specifying, interfered base station need receive the condition code from interference source base station.

Interfered base station can select any one receive mode following:

A) receive at the ascending time slot adjacent with GP.

B) signal of protection interval ascending time slot is received.

C) be set to entirely receive pattern, receive the signal of descending time slot and ascending time slot simultaneously.

Interfered base station described in step 305 mates received signal by using the condition code of each grouping, can determine that the quantized value that each grouping produces interference comprises:

Interfered base station receives the signal coming from telepoint base station, and interfered base station need use each condition code to carry out channel estimating, and the method for channel estimating has:

A) coupling of time domain is correlated with.

Suppose that Received signal strength is: r=[r ₁r ₂r _m], condition code is c=[c ₁c ₂c _n].Time domain is mated

Related definition is:

$h_i=\left\{\begin{array}{c}\frac{1}{i}\underset{j=1}{\overset{i}{\mathrm{\Σ}}}{r}_j\·c_{M-i+j}^{*},i=\mathrm{1,2},...,N\\ \frac{1}{N}\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{r}_{j+i-N}\·c_j^{*},i=N+1,N+2,...,M\\ \frac{1}{N+M-i}\underset{j=1}{\overset{N+M-i}{\mathrm{\Σ}}}{r}_{j+i-N}\·c_j^{*},i=M+1,M+2,...,N+M-1\end{array}\right.$

The relevant condition code being applicable to zero correlative window characteristic aperiodic of time domain coupling.

B) time-domain signal is transformed to frequency domain, then carry out equilibrium with the frequency domain representation of condition code, and then transform to time domain, obtain corresponding channel estimating.

Suppose that Received signal strength is: r=[r ₁r ₂r _n], condition code is c=[c ₁c ₂c _n].Channel estimating

Can be expressed as:

$\hat{h}=\mathrm{ifft}(\mathrm{fft}\left(r\right)./\mathrm{fft}\left(c\right))$

Wherein ./for point is except operation.

Carry out channel estimating for use different characteristic code and obtain corresponding envelope, the size of envelope represents the power of interference source, therefore the mean value of envelope can be produced the quantized value of interference as corresponding interference source grouping.

The embodiment of the present invention also proposes inter base station interference positioner in a kind of TDD mobile communication system, and described device is positioned at interfered base station side, comprising:

Condition code configuration module, for interference source base station being divided into several groupings, for the condition code that all base station assigns in each grouping one are unified; The condition code that the base station assigns of different grouping is different;

Condition code receiver module, for receiving the condition code that interference source base station sends at particular moment t;

Matching module, for using the condition code of each grouping to mate received signal, determining that each grouping produces the quantized value of interference, this quantized value and the threshold value pre-set being compared, determine strong jamming grouping and weak jamming grouping;

Judge module, for judging whether the base station number comprised in determined each strong jamming grouping of described matching module is 1, if not, the instruction promoting transmitted power is sent to the interference source base station in described strong jamming grouping, and/or, send to the interference source base station in other groupings the instruction reducing transmitted power.

Preferably, described condition code configuration module comprises:

Interference source grouped element, for being divided into several grouping relative to the antenna directional angle of interfered base station by interference source base station according to the geographic area residing for interference source base station or interference source base station; Wherein, (n-1)th grade of grouping comprises more than one n-th grade of grouping;

Condition code dispensing unit, for the condition code that all base station assigns one in each grouping of being divided into for interference source grouped element are unified; The condition code that the base station assigns of different grouping is different.

Preferably, the auto-correlation of the skew of the condition code that described condition code dispensing unit configures is zero correlation or weak relevant, and the cross-correlation of different condition codes is zero correlation or weak relevant.

Preferably, described condition code is periodicity zero correlation window code.

Preferably, described condition code dispensing unit comprises:

Root sequence definition subelement, for being N for length _zCzadoff-Chu sequence, define its u ^th(0≤u≤N _zC-2) root sequence is: 0≤n≤N _zC-1;

ZC code generates subelement, for the root sequence defined according to described sequence definition subelement, by formula x _u,v(n)=x _u((n+C _v) modN _zC) generate the Zadoff-Chu code that a group has zero correlative window characteristic, wherein C _v=vN _cS, n _cSfor zero correlation window length;

ZC code assign ment subelement, for choosing the Zadoff-Chu code assign ment of difference group to the grouping of different interference sources, or the different Zadoff-Chu code assign ment chosen in same group divide into groups to different interference sources.

Preferably, described condition code is aperiodicity zero correlation window mutual-complementing code.

Preferably, the receive mode that adopts of described condition code receiver module for following any one:

Interfered base station receives at the ascending time slot adjacent with protection interval;

Interfered base station receives the signal of protection interval ascending time slot; Or

Interfered base station is set to entirely receive pattern, receives the signal of descending time slot and ascending time slot simultaneously.

Preferably, described matching module comprises:

Channel estimating unit, for carrying out channel estimating to each condition code received;

Quantifying unit, carries out channel estimating for use different characteristic code and obtains corresponding envelope, the mean value of envelope is produced the quantized value of interference as corresponding interference source grouping.

Use the present invention program, the position of interference source between TDD system base station can be determined exactly, thus for taking further interference suppression measure to provide foundation.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (19)

1. an interference positioning method between TDD base stations in mobile communication system, is characterized in that, comprise the steps:

A, interference source base station is divided into several groupings;

B, for the unified condition code of all base station assigns in each grouping one; The condition code that the base station assigns of different grouping is different;

C, send its corresponding condition code in all interference source base station of moment t its descending time slot is unified, interfered base station receives the condition code that interference source base station sends;

D, interfered base station mate received signal by using the condition code of each grouping, determine that each grouping produces the quantized value of interference, this quantized value and the threshold value pre-set are compared, and determine strong jamming grouping and weak jamming grouping;

E, judge in each strong jamming grouping, whether the base station number that comprises is 1, if so, then process ends; Otherwise the power ascension divide into groups described strong jamming and/or other packet power reduced, is subdivided into less grouping further by interference source base station, and returns step B.

2. method according to claim 1, is characterized in that, before described steps A, comprises further: carried out synchronously by all base stations frame number.

3. method according to claim 1, is characterized in that, steps A for: relative to the antenna directional angle of interfered base station, interference source base station is divided into several groupings according to the geographic area residing for interference source base station or interference source base station; Wherein, (n-1)th grade of grouping comprises more than one n-th grade of grouping.

4. method according to claim 1, is characterized in that, the auto-correlation of the skew of described condition code is zero correlation or weak relevant, and the cross-correlation of different condition codes is zero correlation or weak relevant.

5. method according to claim 4, is characterized in that, described condition code is periodicity zero correlation window code.

6. method according to claim 5, is characterized in that, described step B comprises:

B1, be N for length _zCzadoff-Chu sequence, define its u ^th(0≤u≤N _zC-2) root sequence is: 0≤n≤N _zC-1;

B2, by a root sequence according to formula x _u,v(n)=x _u((n+C _v) modN _zC) generate the Zadoff-Chu code that a group has zero correlative window characteristic, wherein C _v=vN _cS, n _cSfor zero correlation window length;

B3, choose the Zadoff-Chu code assign ment of different group to the grouping of different interference sources, or, choose different Zadoff-Chu code assign ment in same group to the grouping of different interference sources.

7. method according to claim 6, is characterized in that, comprises further described in step C in the interference source base station that moment t is all in unified its corresponding condition code that sends of its descending time slot:

The descending time slot adjacent at protection interval sends condition code, adds Cyclic Prefix before described condition code.

8. method according to claim 4, is characterized in that, described condition code is aperiodicity zero correlation window mutual-complementing code.

9. method according to claim 8, is characterized in that, comprises further described in step C in the interference source base station that moment t is all in unified its corresponding condition code that sends of its descending time slot

Send aperiodicity zero correlation window mutual-complementing code at the descending time slot that protection interval is adjacent, and before the C portion and S portion of described aperiodicity zero correlation window mutual-complementing code, add son protection interval respectively.

10. the method according to any one of claim 1 to 9, is characterized in that, interfered base station described in step C receive receive mode that the condition code that sends of interference source base station adopts for following any one:

Interfered base station receives at the ascending time slot adjacent with protection interval;

Interfered base station receives the signal of protection interval ascending time slot; Or

Interfered base station is set to entirely receive pattern, receives the signal of descending time slot and ascending time slot simultaneously.

11. methods according to any one of claim 1 to 9, is characterized in that, interfered base station described in step D mates received signal by using the condition code of each grouping, determine that the quantized value that each grouping produces interference comprises:

Interfered base station carries out channel estimating to each condition code received;

Channel estimating is carried out for use different characteristic code and obtains corresponding envelope, the mean value of envelope is produced the quantized value of interference as corresponding interference source grouping.

Disturb positioner between 12. 1 kinds of TDD base stations in mobile communication systems, it is characterized in that, described device is positioned at interfered base station side, comprising:

Condition code configuration module, for interference source base station being divided into several groupings, for the condition code that all base station assigns in each grouping one are unified; The condition code that the base station assigns of different grouping is different, and after judge module sends the instruction promoting transmitted power or the instruction reducing transmitted power, interference source base station is subdivided into less grouping further;

Condition code receiver module, for receiving the condition code that interference source base station sends at particular moment t;

Matching module, for using the condition code of each grouping to mate received signal, determining that each grouping produces the quantized value of interference, this quantized value and the threshold value pre-set being compared, determine strong jamming grouping and weak jamming grouping;

Judge module, for judging whether the base station number comprised in determined each strong jamming grouping of described matching module is 1, if not, the instruction promoting transmitted power is sent to the interference source base station in described strong jamming grouping, and/or, send to the interference source base station in other groupings the instruction reducing transmitted power.

13. devices according to claim 12, is characterized in that, described condition code configuration module comprises:

Interference source grouped element, for being divided into several grouping relative to the antenna directional angle of interfered base station by interference source base station according to the geographic area residing for interference source base station or interference source base station; Wherein, (n-1)th grade of grouping comprises more than one n-th grade of grouping;

Condition code dispensing unit, for the condition code that all base station assigns one in each grouping of being divided into for interference source grouped element are unified; The condition code that the base station assigns of different grouping is different.

14. devices according to claim 12, is characterized in that, the auto-correlation of the skew of the condition code that described condition code dispensing unit configures is zero correlation or weak relevant, and the cross-correlation of different condition codes is zero correlation or weak relevant.

15. devices according to claim 14, is characterized in that, described condition code is periodicity zero correlation window code.

16. devices according to claim 15, is characterized in that, described condition code dispensing unit comprises:

Root sequence definition subelement, for being N for length _zCzadoff-Chu sequence, define its u ^th(0≤u≤N _zC-2) root sequence is: 0≤n≤N _zC-1;

ZC code generates subelement, for the root sequence defined according to described sequence definition subelement, by formula x _u,v(n)=x _u((n+C _v) modN _zC) generate the Zadoff-Chu code that a group has zero correlative window characteristic, wherein C _v=vN _cS, n _cSfor zero correlation window length;

ZC code assign ment subelement, for choosing the Zadoff-Chu code assign ment of difference group to the grouping of different interference sources, or the different Zadoff-Chu code assign ment chosen in same group divide into groups to different interference sources.

17. devices according to claim 14, is characterized in that, described condition code is aperiodicity zero correlation window mutual-complementing code.

18., according to claim 12 to the device described in 17 any one, is characterized in that, the receive mode that described condition code receiver module adopts for following any one:

Interfered base station receives at the ascending time slot adjacent with protection interval;

Interfered base station receives the signal of protection interval ascending time slot; Or

Interfered base station is set to entirely receive pattern, receives the signal of descending time slot and ascending time slot simultaneously.

19., according to claim 12 to the device described in 17 any one, is characterized in that, described matching module comprises:

Channel estimating unit, for carrying out channel estimating to each condition code received;

Quantifying unit, carries out channel estimating for use different characteristic code and obtains corresponding envelope, the mean value of envelope is produced the quantized value of interference as corresponding interference source grouping.