CN104883699A - Interference source determination method and apparatus - Google Patents

Abstract

The embodiment of the invention provides an interference source determination method and apparatus. The method comprises the steps of: an interfered base station sending a synchronous code of downlink (Sync_DL), and meanwhile a base station receiving subframes transmitted by the interfered base station; determining the position of a downlink pilot time slot (DwPTS) among received baseband data by the base station; and determining by the base station whether the Sync_DL exists at the DwPTS position. If the Sync_DL is detected, the base station is an interference source of the interfered base station. In an interference source determination process, only the interfered base station sends signals, and meanwhile other far-end base stations only receive signals, thereby solving the problem of difficulty in obtaining accurate and reliable results and positioning a far-end interference source caused by heavy superposition of interference signals, shorter Sync_DL and limited matching precision, and accurately determining a base station interfering a target base station.

Description

Interference source defining method and device

Technical field

The present invention relates to wireless communication technology, particularly relate to a kind of interference source defining method and device.

Background technology

Time Division-Synchronous Code Division Multiple Access (Time Division-Synchronization Code DivisionMultiple Access, TD-SCDMA) system adopts time division duplex (Time Division Duplex, TDD) pattern.Fig. 1 is the subframe structure schematic diagram in prior art in TD-SCDMA system.As shown in Figure 1, each subframe is made up of 7 main time slots (Time Slot, TS) and 3 special time slots, and 7 main time slots comprise ascending time slot and descending time slot, respectively as shown in the upward arrow in figure and lower arrow; 3 special time slots are descending pilot frequency time slot (Downlink Pilot Time Slot, DwPTS), uplink pilot time slot (Uplink Pilot Time Slot, UpPTS) and protection interval (GuardInterval, GP).In TD-SCDMA system, keep synchronous between different base station, along with the increase of propagation distance, such as, in the network environment of reality, because the impact of atmospheric temperature, air pressure etc., the communication environments of signal changes, radio wave generation refraction causes propagation distance to increase, and makes the upward signal of target BS can be subject to the interference of the downstream signal of telepoint base station, and Fig. 2 is the upward signal interference schematic diagram of TD-SCDMA system in prior art.As shown in Figure 2, hypothetical target base station (interfered base station) is NodeB0(Nb0), interference base station is Nb1, Nb2 and Nb3, and interference base station is respectively T1, T2, T3 to the path time difference of target BS.The downstream signal power ratio of launching when interference base station is comparatively large, and when the time of downstream signal arrival target BS falls in the time window of target BS transmission upward signal, causes interference to the upward signal of target BS.

For avoiding disturbing, need to determine interference source in advance.In prior art, descending synchronous code (the Synchronous Code of Downlink that this locality stores by target BS, Sync_DL) relevant matches is carried out with the Sync_DL received in upward signal transmission phase, if both correlations exceed threshold value, illustrate that this telepoint base station is the interference source of target BS.

But, along with the increase of propagation distance, the interference base station of target BS may be multiple, interference signal superposes in a large number, and Sync_DL is shorter, matching precision is limited, and only there are 32 kinds of Sync_DL in TD-SCDMA system, be difficult to obtain accurate, reliable testing result, be difficult to orient far-end interference source.

Summary of the invention

The invention provides a kind of interference source defining method and device, realize causing accurately determining of the base station of interference to target BS.

First aspect, the embodiment of the present invention provides a kind of interference source defining method, and the method comprises:

Base station, while disturbed base station sends descending synchronous code Sync_DL, receives the subframe that described disturbed base station sends;

Descending pilot frequency time slot DwPTS position is determined in described base station from the base band data received;

Whether the signal that described base station is detected in described DwPTS position exists described Sync_DL, if described Sync_DL detected, then described base station is the interference source of described disturbed base station.

In the first possible implementation in first, whether the signal that described base station is detected in described DwPTS position exists described Sync_DL, comprising:

Correlation computations is carried out to the signal in described DwPTS position and described Sync_DL in described base station, obtains the correlated series of each antenna;

The average power of described each antenna, according to the correlated series of described each antenna, is determined in described base station;

Peak value and the peak of the related power spectral sequence of signal in described DwPTS position and described Sync_DL, according to the average power of described each antenna, is determined in described base station;

Described base station judges that whether described peak value is reliable, if reliably, then judge whether the power of the peak value window at described peak value place exceedes pre-determined threshold, wherein, the position of described peak value window can be determined according to described peak;

If described base station judges whether the power of described peak value window exceedes pre-determined threshold, then think and described Sync_DL detected, then described base station is the interference source of described disturbed base station.

In conjunction with the first possible implementation of first aspect, in the implementation that the second in first is possible, the interference power of described base station to described disturbed base station is the power of described peak value window.

In conjunction with the first possible implementation of first aspect, in the third the possible implementation in first, described base station judges that whether described peak value is reliable, comprising:

Described base station judges whether the average power of the power that described peak value is corresponding and peak value front window is greater than reliability thresholds, and whether the average power of power corresponding to described peak value and peak value rear window is greater than described reliability thresholds, described peak value front window is the window that 32 chips before the original position of described peak value window are formed, and described peak value rear window is the window that 32 chips after the end position of described peak value window are formed.

In conjunction with first aspect, first aspect the first, the second or the third possible implementation, in the 4th kind of possible implementation in first, if when multiple described base station detects that the signal in respective described DwPTS position exists described Sync_DL, the interference source complete or collected works of those described disturbed base stations of composition, multiple described base station, meanwhile, described disturbed base station is the interference base station of each described base station.

Second aspect, the embodiment of the present invention provides a kind of interference source determining device, comprising:

Receiver module, while sending descending synchronous code Sync_DL in disturbed base station, receives the subframe that described disturbed base station sends;

Determination module, for determining descending pilot frequency time slot DwPTS position from the base band data received;

Detection module, whether there is described Sync_DL for the signal detected in described DwPTS position that described determination module determines, if described Sync_DL detected, then described base station is the interference source of described disturbed base station.

In the first possible implementation in second, described detection module, specifically for carrying out correlation computations to the signal in described DwPTS position and described Sync_DL, obtain the correlated series of each antenna, according to the correlated series of described each antenna, determine the average power of described each antenna, according to the average power of described each antenna, determine peak value and the peak of the related power spectral sequence of signal in described DwPTS position and described Sync_DL, judge that whether described peak value is reliable, if reliable, then judge whether the power of the peak value window at described peak value place exceedes pre-determined threshold, wherein, the position of described peak value window can be determined according to described peak, if judge, whether the power of described peak value window exceedes pre-determined threshold, then think and described Sync_DL detected, then described base station is the interference source of described disturbed base station.

In conjunction with the first possible implementation of second aspect, in the implementation that the second in second is possible, the interference power of described base station to described disturbed base station is the power of described peak value window.

In conjunction with the first possible implementation of second aspect, in the third possible implementation in second, described detection module, specifically for judging whether the average power of the power that described peak value is corresponding and peak value front window is greater than reliability thresholds, and whether the average power of power corresponding to described peak value and peak value rear window is greater than described reliability thresholds, described peak value front window is the window that 32 chips before the original position of described peak value window are formed, and described peak value rear window is the window that 32 chips after the end position of described peak value window are formed.

In conjunction with second aspect, second aspect the first, the second or the third possible implementation, in the 4th kind of possible implementation in second, if when the detection module of multiple base station detects that the signal in respective described DwPTS position exists described Sync_DL, the interference source complete or collected works of those described disturbed base stations of composition, multiple described base station, meanwhile, described disturbed base station is the interference base station of each described base station.

The interference source defining method that the embodiment of the present invention provides and device, in the deterministic process of interference source, disturbed base station is only had to send signal, the base station of other far-ends receives only signal while disturbed base station sends signal, reduce because interference signal superposes in a large number, and Sync_DL is shorter, matching precision is limited, and in TD-SCDMA system, only there are 32 kinds of Sync_DL, be difficult to obtain accurate, reliable testing result, be difficult to the problem orienting far-end interference source, realize causing accurately determining of the base station of interference to target BS.

Accompanying drawing explanation

Fig. 1 is the subframe structure schematic diagram in prior art in TD-SCDMA system;

Fig. 2 is the upward signal interference schematic diagram of TD-SCDMA system in prior art;

Fig. 3 is the flow chart of interference source embodiment of the method one of the present invention;

The structural representation of the DwPTS time slot that Fig. 4 is suitable for by interference source defining method of the present invention;

Fig. 5 is the window schematic diagram of DwPTS Window in interference source defining method embodiment two of the present invention;

Fig. 6 is the schematic diagram of the peak value window in interference source defining method embodiment two of the present invention;

Fig. 7 is the structural representation of interference source determining device of the present invention.

Embodiment

For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Fig. 3 is the flow chart of interference source embodiment of the method one of the present invention.The present embodiment is that the present invention will be described in detail from the angle of the interference base station disturbed base station being caused to interference, and the present embodiment is applicable to transmission range when increasing, and needs to carry out exactly determined scene to the interference source of disturbed base station.Concrete, the present embodiment comprises the steps:

101, base station is while disturbed base station sends descending synchronous code Sync_DL, receives the subframe that disturbed base station sends.

When the upward signal of disturbed base station occurs abnormal, such as, the signal strength signal intensity of upward signal lower than preset strength time, uplink interference signal code power (Interference on Signal Code Power(ISCP) abnormal time etc., network side element triggers disturbed base station and carries out interference source and determine, or, disturbed base station self is triggered interference source and is determined, wherein, ISCP exception comprises uplink pilot time slot (Uplink PilotTime Slot, UpPTS) exception, uplink service time slot exception etc.In interference source deterministic process, disturbed base station normally works, distally, send Sync_DL with it with base station frequently.Each base station of far-end, while disturbed base station sends Sync_DL, does not all send downlink pilot frequency channel (DownlinkPilot Channel, DwPCH), but receives the descending sub frame of disturbed base station transmission.

It should be noted that, in this step, while disturbed base station sends Sync_DL, each base station of far-end does not also send data at descending time slot but changes reception data into.

102, base station from receive base band data determine descending pilot frequency time slot DwPTS position.

In this step, base station is for being provided with the base station of operational administrative (Operation Management, OM) master control borad or off-line tools etc., and all base band datas in this subframe are preserved after receiving the subframe of disturbed base station transmission in base station.Because base station is also receive data at descending time slot, therefore, base band data comprises the data that ascending time slot and descending time slot receive.Then, by OM master control borad or off-line tools etc., determine descending pilot frequency time slot position in base band data, such as, DwPTS Window way of search can be adopted to carry out the determination of the position of DwPTS time slot.

It should be noted that, although in this process above-mentioned, DwPTS time slot position is determined by the OM master control borad be arranged on base station or off-line tools etc., but, the present invention is not as restriction, in the execution mode that other are possible, OM master control borad or off-line tools etc. also can independently be arranged, and the present invention is not as restriction.

Whether the signal that 103, base station is detected in DwPTS position exists Sync_DL, if Sync_DL detected, then base station is the interference source of disturbed base station.

After determining DwPTS position, whether the signal that base station is detected in this DwPTS position exists Sync_DL, if base station detects that the signal in DwPTS position exists Sync_DL, then thinks that this base station is the interference source of disturbed base station.

The interference source defining method that the embodiment of the present invention provides, with disturbed base station with each telepoint base station frequently, while disturbed base station sends Sync_DL code, all do not send downlink pilot frequency channel, but receive descending sub frame all base band datas preserved in this subframe that disturbed base station sends, then, determine the position of lower DwPTS in base band data, whether the signal detected in this DwPTS position exists Sync_DL, if exist, then thinks that this base station is the interference source of disturbed base station.In this interference source deterministic process, disturbed base station is only had to send signal, the base station of other far-ends receives only signal while disturbed base station sends signal, reduce because interference signal superposes in a large number, and Sync_DL is shorter, matching precision is limited, and in TD-SCDMA system, only there are 32 kinds of Sync_DL, be difficult to obtain accurately, testing result reliably, be difficult to the problem orienting far-end interference source, realize causing accurately determining of the base station of interference to target BS.

Optionally, in above-described embodiment one, the complete base band data of the 5ms of the descending sub frame received can be extracted in each base station of far-end, adopts DwPTS Window way of search to carry out the determination of DwPTS time slot position.After determining DwPTS time slot position, relevant matches is carried out to the Sync_DL that the signal in this DwPTS position and disturbed base station issue, namely certain length near DwPTS position is got, such as window length is that the data of 128 chips (chip) and Sync_DL carry out correlation computations, size according to correlation peak power carries out reliability judgement, when being judged as reliable, then think that this base station is the interference source of interfered base station.Below, the DwPTS Window search procedure in this interference source defining method and Sync_DL relevant matches process are elaborated.

(1) DwPTS Window search procedure:

Concrete, suppose the base station of some far-ends, it is while disturbed base station sends Sync_DL, and receiving data is the base band data that descending sub frame that this base station receives is complete, can be expressed as r (m, l ₀), wherein, l ₀=0,1 ..., L-1, m=0,1 ..., M, L are the length 6400chip of a sub-frame data, M is antenna number.Subframe due to TD-SCDMA system has special DwPTS time slot, and this DwPTS time slot is in fixing position, has unique structure, as shown in Figure 4.

The structural representation of the DwPTS time slot that Fig. 4 is suitable for by interference source defining method of the present invention.As shown in Figure 4, DwPTS comprises the Sync_DL of GP and 64chip of 32chip.The GP of 96chip is also comprised after DwPTS.According to the special construction of DwPTS, a length is the signal of 64chip, if all do not have signal or signal very faint before and after it, then the method that Window can be adopted to search element determines the approximate location of the DwPTS in the base band data that descending sub frame is complete.Concrete, this DwPTS Window search procedure comprises the steps:

The first step: mend 32 0 before the base band data that descending sub frame is complete, now, the length of mending the reception data after 0 is L+32.

Second step: the power calculating the reception data of each antenna according to formula (1), and press antenna addition.Wherein, formula (1) is:

wherein, l=0,1 ..., L+32-1.

3rd step: power calculation is carried out to the most initial DwPTS Window.

Fig. 5 is the window schematic diagram of DwPTS Window in interference source defining method embodiment two of the present invention.As shown in Figure 5, suppose that Sync_DL is positioned at the long descending synchronous code window (sync-window) of 64chip, getting the 32chip before sync-window is front window (pre-window), and getting the 32chip after sync-window is rear window (post-window).When the beginning chip of pre-window is 0, namely as l=0, the DwPTS Window be made up of pre-window, sync-window, post-window is the most initial DwPTS Window.Now, calculates in sync-window according to formula (2), formula (3) and formula (4) respectively, the power of data in the interior and post-window of pre-window and.

Wherein, formula (2) is:

${\mathrm{Psum}}_{\mathrm{sync}-\mathrm{window}}\left(l\right)=\underset{n=0}{\overset{63}{\mathrm{\Σ}}}\mathrm{Pr}(n+l+32),l=0;$

Formula (3) is:

${\mathrm{Psum}}_{\mathrm{pre}-\mathrm{window}}\left(l\right)=\underset{n=0}{\overset{31}{\mathrm{\Σ}}}\mathrm{Pr}(n+l),l=0;$

Formula (4) is:

${\mathrm{Psum}}_{\mathrm{post}-\mathrm{window}}\left(l\right)=\underset{n=0}{\overset{31}{\mathrm{\Σ}}}\mathrm{Pr}(n+l),l=0;$

According in formula (5) pre-window with the power of data in post-window and, wherein, formula (5) is:

Psum _pre-post(l)=Psum _pre-window(l)+Psum _post-window(l)，l=0。

4th step: determine in the most initial DwPTS Window according to formula (6), Psum _sync-window(l) and Psum _pre-postthe ratio R atio (l) of (l), wherein, formula (6) is:

Ratio(l)=Psum _sync-window(l)/Psum _pre-post(l)，l=0。

5th step: the value of Ratio (l) when adopting the method for sliding window to calculate l ∈ [1, L-127+32], and the position l finding Ratio (l) maximum _peak, position l _peakcorresponding Ratio (l) can be expressed as Ratio _peak.

Concrete, can determine according to formula (7) ~ formula (11) the position l that Ratio (l) is maximum _peak.Wherein, formula (7) is:

Psum _sync-window(l)=Psum _sync-window(l-1)-Pr(l+31)+Pr(l+95)，l∈[1,L-127+32]；

Formula (8) is:

Psum _pre-post(l)＝Psum _pre-window(l)-Pr(l-1)+Pr(l+31)，l∈[1,L-127+32]；+Psum _post-window(l)-Pr(l+95)+Pr(l+127)

Formula (9) is:

Ratio(l)=Psum _sync-window(l)/Psum _pre-post(l)，l=0，1，……，L-127+32；

Formula (10) is:

${\mathrm{Ratio}}_{\mathrm{peak}}=\underset{l}{\max }\left\{\mathrm{Ratio}\left(l\right)\right\},$ l=0，1，……，L-127+32；

Formula (11) is:

$l_{\mathrm{peak}}=\arg \underset{l}{\max }\left\{\mathrm{Ratio}\left(l\right)\right\}.$

6th step: judge Ratio _peakwhether be greater than thresholding Th _sNRForDwPTS, Th _sNRForDwPTSfor configurable O & M parameter, unit is decibel (dB).

Concrete, by Th before judgement _sNRForDwPTSbe converted to linear value, if Ratio _peak< 10 ∧ (Th _sNRForDwPTS/ 10), then illustrate that the signal to noise ratio (SignalNoise Ratio, SNR) of current DwPTS Window is lower, there is not DwPCH in this DwPTS Window, stop the detection to this DwPTS Window; Otherwise, if Ratio _peak>=10 ∧ (Th _sNRForDwPTS/ 10), then illustrate that the SNR of current DwPTS Window is higher, in this DwPTS Window, there is DwPCH, need the Sync_DL to the signal in this DwPTS Window and disturbed base station issue to carry out relevant matches.Concrete matching process, can see following (two) Sync_DL relevant matches process.

(2) Sync_DL relevant matches process

In general, Sync_DL is predetermined pseudo noise (Pseudo-noiseSequence, the PN) sequence of 64 of a system, have at most 32 kinds may, code word has good orthogonality to each other.After employing DwPTS Window method obtains DwPTS position, whether the signal detected in this DwPTS position exists the Sync_DL that disturbed base station sends, if the Sync_DL that disturbed base station sends detected, then this base station is the interference source of disturbed base station.Concrete, correlation computations can be carried out to the Sync_DL that the signal in DwPTS position and disturbed base station send, obtain correlation peak, and correlation peak and pre-determined threshold are compared, thus judge whether the signal in this DwPTS position exists the Sync_DL of disturbed base station transmission.Concrete deterministic process can see following steps:

The first step: by r (m, l+l _{star_corr}) Sync_DL that sends with disturbed base station carries out correlation computations, obtains the correlated series of each antenna.

The Sync_DL that disturbed base station sends can be expressed as SyncDL (i, n), i=0,1 ... 63; N ∈ (0,1 ... 31); Received signal strength in the DwPTS Window determined in DwPTS Window search procedure can be expressed as r (m, l+l _{start_corr}), l=0,1 ... 127, m=0,1 ..., M, l _{star_corr}for the chip number of the original position of this Window, wherein, the Received signal strength in DwPTS Window except the DwPTS signal comprising 96chip be also comprise the GP signal of DwPTS 32chip below.Concrete, the correlated series of each antenna can be obtained according to formula (12).Wherein, formula (12) is:

$C_{\mathrm{syncDL}}(k,m,n)=\underset{i=0}{\overset{63}{\mathrm{\&Sigma;}}}r(m,i+k+l_{\mathrm{star}\_\mathrm{corr}})\&times;\mathrm{SyncDL}(i,n),$ K=0,1 ... 64, n=0,1 ... 31, m=0,1 ..., M, M are antenna number.

Second step: according to the correlated series of each antenna, determines the average power of each antenna.

In this step, according to formula (13), the power spectrum sequence of the correlated series of each antenna is sued for peace, and antenna is averaging.Wherein, formula (13) is:

$P_{\mathrm{syncDL}}(k,n)=\frac{1}{M}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{\left|\right|C_{\mathrm{syncDL}}(k,m,n)\left|\right|}^2,$ k=0,1,…64，n=0,1,…31。

3rd step: according to the average power of each antenna, determines peak value and the peak of the related power spectral sequence of signal in DwPTS position and Sync_DL.

In this step, determine the peak value p of signal in DwPTS position and Sync_DL correlation power spectrum sequence according to formula (14) _max, and determine peak k according to formula (15) _max(n).Wherein, formula (14) is:

$p_{\max }=\underset{k}{\max }\left\{p_{\mathrm{synDL}}(k,n)\right\},$ n=0,1,…31；

Formula (15) is:

$k_{\max }\left(n\right)=\arg \underset{k}{\max }\left\{p_{\mathrm{xyncDL}}(k,n)\right\}.$

4th step: base station judges peak value p _maxwhether reliable, if reliably, then judge peak value p _maxwhether the power of the peak value window at place exceedes pre-determined threshold, and wherein, the position of peak value window can according to peak k _maxn () is determined; If base station judges whether the power of peak value window exceedes pre-determined threshold, then think and Sync_DL detected, then base station is the interference source of disturbed base station.

Fig. 6 is the schematic diagram of the peak value window in interference source defining method embodiment two of the present invention.As described in Figure 6, p _maxcorresponding position is k _max(n), the original position of peak value window and end position can represent with formula (16) and formula (17) respectively, and wherein, formula (16) is:

K _start=max{k _max(n)-[△ T/3], the value of 1}, △ can be such as 6;

Formula (17) is:

K _end=min{k _max(n)+[2 △ T/3], 128}, _△value can be such as 6.

In reliability deterministic process, peak value p _maxbe the power that peak value is corresponding, p _maxwith the average power content P of peak value front window _befoor the average power content P of peak value rear window _afterthe reliability thresholds of difference be Pd_dB, base station judges p _maxwith P _befodifference whether be greater than Pd_dB, and p _maxwith P _afterdifference whether be greater than Pd_dB, if be greater than, then think this p _maxfor firm peak, continue whether pre-determined threshold is exceeded to the power of peak value window and judge; Otherwise, this p _maxmay, for missing measured value, need to remeasure.In this process, peak value front window is the window that 32 chips before the original position of peak value window are formed, and peak value rear window is the window that 32 chips after the end position of peak value window are formed.

Wherein, as peak value p _maxposition be k _maxtime (n), the average power P of peak value front window _befon () can obtain according to formula (18), the average power P of peak value rear window _aften () can obtain according to formula (19).Wherein, formula (18) is:

$P_{\mathrm{befo}}\left(n\right)=\frac{1}{L_{\mathrm{befo}}}\&times;\underset{\max \{k_{\max }\left(n\right)-32-\frac{\mathrm{\&Delta;T}}{3},1\}}{\overset{\max \{k_{\max }\left(n\right)-\frac{\mathrm{\&Delta;T}}{3}-\mathrm{1,1}\}}{\mathrm{\&Sigma;p}(k,n)}};$

Formula (19) is:

$P_{\mathrm{atfe}}\left(n\right)=\frac{1}{L_{\mathrm{after}}}\&times;\underset{\max \{k_{\max }\left(n\right)+1+\frac{2\mathrm{\&Delta;T}}{3},128\}}{\overset{\max \{k_{\max }\left(n\right)+32+\frac{2\mathrm{\&Delta;T}}{3},128\}}{\mathrm{\&Sigma;p}(k,n)}};$

L in above-mentioned formula (18) _befocan obtain according to formula (20), the L in formula (19) _aftercan obtain according to formula (21).Wherein, formula (20) is:

$L_{\mathrm{befo}}=\max \{k_{\max }\left(n\right)-\frac{\mathrm{\&Delta;T}}{3}-1,1\}-\max \{k_{\max }\left(n\right)-32-\frac{\mathrm{\&Delta;T}}{3}-\mathrm{1,1}\}+1;$

Formula (21) is:

$L_{\mathrm{after}}=\min \{k_{\max }\left(n\right)+32+\frac{2\mathrm{\&Delta;}}{3},128\}-\min \{k_{\max }\left(n\right)+1+\frac{2\mathrm{\&Delta;}}{3},128\}+1.$

Getting P _befo(n) and P _afteafter (n), judge peak value p _maxwhether reliable, namely judge p _max-P _befo(n) > 10 ∧ (Pd_dB/10) and p _max-P _afterwhether (n) > 10 ∧ (Pd_dB/10) sets up, if both set up, then this p is described _maxreliably, subsequent calculations is continued; Otherwise, think this p _maxunreliable, stop calculating.

5th step: judge peak value p _maxwhether the power of the peak value window at place exceedes pre-determined threshold TH _{forDwPTSInter}if base station judges whether the power of peak value window exceedes pre-determined threshold, then think and Sync_DL detected, then base station is the interference source of disturbed base station.

In this process, peak value p _maxthe power of the peak value window at place can obtain according to formula (22), and wherein, formula (22) is:

$p_{\mathrm{peakwin}}\left(n\right)=\underset{k=\min \{k_{\max }\left(n\right)+1+\frac{2\mathrm{\&Delta;T}}{3},128\}}{\overset{\max \{k_{\max }\left(n\right)-\frac{\mathrm{\&Delta;T}}{3}-\mathrm{1,1}\}}{\mathrm{\&Sigma;p}(k,n)-\frac{p_{\mathrm{befo}}\left(n\right)\&times;L_{\mathrm{befo}}+p_{\mathrm{after}}\left(n\right)\&times;L_{\mathrm{after}}}{L_{\mathrm{befo}}+L_{\mathrm{after}}}\&times;(\mathrm{\&Delta;}+1).}}$

At acquisition peak value p _maxthe power p of the peak value window at place _peakwinafter (n), according to formula (23) by p _peakwinn () is converted to the average absolute interference power p to single chip _corrdBm (n).Wherein, formula (23) is:

P _corrdBm (n)=10log ₁₀p _peakwin(n)-Amplitude+PowIn-36; Wherein, PowIn and Amplitude is the calibration of input data, is respectively the power of input data and corresponding amplitude-scaled value, deducts 36 for average to solid size sheet in this formula.The impact that different calibration produces, can adjust according to input parameter PowIn and Amplitude.

Getting the absolute interference power p of single chip _corrafter dBm (n), determine p _corrdBm (n) > TH _{forDwPTSInter}if set up, then record p _corrdBm (n), peak k _maxn (), think and the Sync_DL that disturbed base station sends detected in the signal of this base station in DwPTS position, namely this base station is the interference source of disturbed base station, and interference power is p _corrdBm (n).Meanwhile, based on the reciprocity of base station interference, this disturbed base station is also the interference source detecting the base station of Sync_DL in the signal in DwPTS position.

Fig. 7 is the structural representation of interference source determining device of the present invention.The interference source determining device that the present embodiment provides is the device embodiment corresponding with Fig. 3 embodiment of the present invention, and it independently can arrange and also can be arranged on base station, and specific implementation process does not repeat them here.Concrete, the interference source determining device 100 that the present embodiment provides specifically comprises:

Receiver module 11, while sending descending synchronous code Sync_DL in disturbed base station, receives the subframe that disturbed base station sends;

Determination module 12, for determining descending pilot frequency time slot DwPTS position from the base band data received;

Detection module 13, whether there is Sync_DL for the signal detected in DwPTS position that determination module 12 determines, if Sync_DL detected, then base station is the interference source of disturbed base station.

The interference source determining device that the embodiment of the present invention provides, with disturbed base station with each telepoint base station frequently, while disturbed base station sends Sync_DL code, all do not send downlink pilot frequency channel, but receive descending sub frame all base band datas preserved in this subframe that disturbed base station sends, then, determine the position of lower DwPTS in base band data, whether the signal detected in this DwPTS position exists Sync_DL, if exist, then thinks that this base station is the interference source of disturbed base station.In this interference source deterministic process, disturbed base station is only had to send signal, the base station of other far-ends receives only signal while disturbed base station sends signal, reduce because interference signal superposes in a large number, and Sync_DL is shorter, matching precision is limited, and in TD-SCDMA system, only there are 32 kinds of Sync_DL, be difficult to obtain accurately, testing result reliably, be difficult to the problem orienting far-end interference source, realize causing accurately determining of the base station of interference to target BS.

Optionally, in above-described embodiment, detection module 13, specifically for carrying out correlation computations to the signal in DwPTS position and Sync_DL, obtain the correlated series of each antenna, according to the correlated series of each antenna, determine the average power of each antenna, according to the average power of each antenna, determine peak value and the peak of the related power spectral sequence of signal in DwPTS position and Sync_DL, judge that whether peak value is reliable, if reliable, then judge whether the power of the peak value window at peak value place exceedes pre-determined threshold, wherein, the position of peak value window can be determined according to peak; If judge, whether the power of peak value window exceedes pre-determined threshold, then think and Sync_DL detected, then base station is the interference source of disturbed base station.

Optionally, in above-described embodiment, base station is the power of peak value window to the interference power of disturbed base station.

Optionally, in above-described embodiment, detection module 13, specifically for judging whether the average power of the power that peak value is corresponding and peak value front window is greater than reliability thresholds, and whether the average power of power corresponding to peak value and peak value rear window is greater than reliability thresholds, peak value front window is the window that 32 chips before the original position of peak value window are formed, and peak value rear window is the window that 32 chips after the end position of peak value window are formed.

Optionally, in above-described embodiment, if when the signal that the detection module of multiple base station detects in respective DwPTS position exists Sync_DL, those multiple base stations form the interference source complete or collected works of disturbed base station, and meanwhile, disturbed base station is the interference base station of each base station.

One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.

Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims (10)

1. an interference source defining method, is characterized in that, comprising:

Base station, while disturbed base station sends descending synchronous code Sync_DL, receives the subframe that described disturbed base station sends;

Descending pilot frequency time slot DwPTS position is determined in described base station from the base band data received;

Whether the signal that described base station is detected in described DwPTS position exists described Sync_DL, if described Sync_DL detected, then described base station is the interference source of described disturbed base station.

2. method according to claim 1, is characterized in that, whether the signal that described base station is detected in described DwPTS position exists described Sync_DL, comprising:

Correlation computations is carried out to the signal in described DwPTS position and described Sync_DL in described base station, obtains the correlated series of each antenna;

The average power of described each antenna, according to the correlated series of described each antenna, is determined in described base station;

Peak value and the peak of the related power spectral sequence of signal in described DwPTS position and described Sync_DL, according to the average power of described each antenna, is determined in described base station;

Described base station judges that whether described peak value is reliable, if reliably, then judge whether the power of the peak value window at described peak value place exceedes pre-determined threshold, wherein, the position of described peak value window can be determined according to described peak;

If described base station judges whether the power of described peak value window exceedes pre-determined threshold, then think and described Sync_DL detected, then described base station is the interference source of described disturbed base station.

3. method according to claim 2, is characterized in that, the interference power of described base station to described disturbed base station is the power of described peak value window.

4. method according to claim 2, is characterized in that, described base station judges that whether described peak value is reliable, comprising:

Described base station judges whether the average power of the power that described peak value is corresponding and peak value front window is greater than reliability thresholds, and whether the average power of power corresponding to described peak value and peak value rear window is greater than described reliability thresholds, described peak value front window is the window that 32 chips before the original position of described peak value window are formed, and described peak value rear window is the window that 32 chips after the end position of described peak value window are formed.

5. the method according to any one of Claims 1 to 4, it is characterized in that, if when multiple described base station detects that the signal in respective described DwPTS position exists described Sync_DL, the interference source complete or collected works of those described disturbed base stations of composition, multiple described base station, meanwhile, described disturbed base station is the interference base station of each described base station.

6. an interference source determining device, is characterized in that, comprising:

Receiver module, while sending descending synchronous code Sync_DL in disturbed base station, receives the subframe that described disturbed base station sends;

Determination module, for determining descending pilot frequency time slot DwPTS position from the base band data received;

Detection module, whether there is described Sync_DL for the signal detected in described DwPTS position that described determination module determines, if described Sync_DL detected, then described base station is the interference source of described disturbed base station.

7. device according to claim 6, is characterized in that,

Described detection module, specifically for carrying out correlation computations to the signal in described DwPTS position and described Sync_DL, obtain the correlated series of each antenna, according to the correlated series of described each antenna, determine the average power of described each antenna, according to the average power of described each antenna, determine peak value and the peak of the related power spectral sequence of signal in described DwPTS position and described Sync_DL, judge that whether described peak value is reliable, if reliable, then judge whether the power of the peak value window at described peak value place exceedes pre-determined threshold, wherein, the position of described peak value window can be determined according to described peak, if judge, whether the power of described peak value window exceedes pre-determined threshold, then think and described Sync_DL detected, then described base station is the interference source of described disturbed base station.

8. device according to claim 7, is characterized in that, the interference power of described base station to described disturbed base station is the power of described peak value window.

9. device according to claim 7, is characterized in that,

Described detection module, specifically for judging whether the average power of the power that described peak value is corresponding and peak value front window is greater than reliability thresholds, and whether the average power of power corresponding to described peak value and peak value rear window is greater than described reliability thresholds, described peak value front window is the window that 32 chips before the original position of described peak value window are formed, and described peak value rear window is the window that 32 chips after the end position of described peak value window are formed.

10. the device according to any one of claim 6 ~ 9, it is characterized in that, if when the detection module of multiple base station detects that the signal in respective described DwPTS position exists described Sync_DL, the interference source complete or collected works of those described disturbed base stations of composition, multiple described base station, meanwhile, described disturbed base station is the interference base station of each described base station.