CN105828349A - Far-end interference detection method and far-end interference detection device based on TD-LTE system - Google Patents

Far-end interference detection method and far-end interference detection device based on TD-LTE system Download PDF

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CN105828349A
CN105828349A CN201510002283.8A CN201510002283A CN105828349A CN 105828349 A CN105828349 A CN 105828349A CN 201510002283 A CN201510002283 A CN 201510002283A CN 105828349 A CN105828349 A CN 105828349A
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far
base station
disturbed
interference
detection device
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CN105828349B (en
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徐晓东
李晓卡
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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Abstract

The invention provides a far-end interference detection method and a far-end interference detection device based on a TD-LTE system. The method comprises the following steps: the far-end interference detection device detects the strength of an interference signal at a non-downlink emission symbol position, wherein the non-downlink emission symbol position includes a protection time slot, an uplink pilot time slot, an uplink symbol in an uplink sub frame, and a position which is configured as a downlink symbol emission position and of which the downlink sends no signal actually, and the uplink signal is received by an interfered base station corresponding to the far-end interference detection device; the far-end interference detection device judges whether the strength of the interference signal decreases as the distance between the non-downlink emission symbol position and the position of a conversion point increases, wherein the conversion point is a time point at which the base station is switched from downlink sending to uplink receiving; and if the strength of the interference signal decreases as the distance between the non-downlink emission symbol position and the position of the conversion point increases, the far-end interference detection device determines the interfered base station is interfered by a far-end interfering base station. Through the scheme of the invention, whether a base station is under far-end interference can be detected accurately, and the information of a far-end interfering base station can be further determined.

Description

A kind of far-end interference detection method based on TD-LTE system and device
Technical field
The present invention relates to communication technical field, particularly relate to a kind of far-end interference detection method based on TD-LTE system and device.
Background technology
Existing far-end interference detection technique has the drawback that
" hangover " feature according to so-called far-end interference carries out the mode of far-end interference detection, exploitativeness is not had in actual implementation process, as shown in Figure 1, assume that propagation distance is that executing of 514.2km and 535.6km is disturbed base station and brought the interference to disturbed base station simultaneously, the interference difference differing only by about 0.3dB, 0.3dB by two symbol detection experienced interference intensity that sub-frame of uplink is adjacent makes do not possess exploitativeness according to hangover detection.
And in the scene that the far-end interference of reality occurs, " hangover " feature is the most inconspicuous, if carrying out judging far-end interference according to hangover feature, it will there is higher error detection probability.
Summary of the invention
It is an object of the invention to provide a kind of far-end interference detection method based on TD-LTE system and device, it is possible to solve the problem that current far-end interference detection not inspection is bigger with loss.
In order to solve above-mentioned technical problem, enforcement a kind of far-end interference detection method based on TD-LTE system of offer of the present invention, wherein, including:
Far-end interference detection device detects the intensity of non-downlink character position experienced interference signal; described non-downlink character position includes the uplink symbol in protection time slot, uplink pilot time slot and sub-frame of uplink and is configured to downlink symbol transmitting position; but the descending unactual position sending symbol, described uplink symbol is received by the disturbed base station corresponding with described far-end interference detection device；
Far-end interference detection device judges whether the intensity of described interference signal reduces along with the increase of the positional distance between non-downlink character position and transfer point, and described transfer point refers to that base station down sends the time point turning uplink receiving；
The most then far-end interference detection device determines that disturbed base station is executed by far-end and disturbs base station and disturbed.
Wherein, after far-end interference detection device determines that the interference disturbing base station is executed in disturbed base station by far-end, also include:
Far-end interference detection device determines that far-end corresponding to disturbed base station is executed and disturbs base station information.
Wherein, the step of the intensity that the detection of described far-end interference detection device detects non-downlink character position experienced interference signal includes:
Non-for detection downlink character position is divided into N number of tim e-domain detection window in time domain by far-end interference detection device；
Far-end interference detection device to described N number of tim e-domain detection window by apart from described transfer point by closely carrying out serial number to remote order；
Interference signal intensity in each detection window is calculated by far-end interference detection device, obtains the interference signal intensity meansigma methods in each detection window.
Wherein, the step that interference signal intensity is calculated by far-end interference detection device includes:
Far-end interference detection device selects predetermined frequency domain resource to calculate the intensity of non-downlink character position experienced interference signal, described predetermined frequency domain resource includes: the frequency domain resource that Physical Broadcast Channel PBCH takies, and/or the frequency domain resource that master sync signal PSS/ auxiliary synchronous signals SSS takies；Or
Far-end interference detection device selects full bandwidth frequency domain resource to calculate non-downlink character position experienced interference signal intensity.
Wherein, described far-end interference detection device judges that the step whether intensity of described interference signal reduces along with the increase of the symbolic distance between non-downlink character position and transfer point includes:
Far-end interference detection device judges that whether the interference signal intensity meansigma methods in later tim e-domain detection window is less than the interference signal intensity meansigma methods in adjacent previous tim e-domain detection window；Or the ratio that the difference of the interference signal intensity meansigma methods in previous tim e-domain detection window and the interference signal intensity meansigma methods in adjacent later tim e-domain detection window is more than 0 is more than a predetermined threshold value.
Wherein, described far-end interference detection device determines that far-end corresponding to disturbed base station is executed and disturbs the step of base station information and include:
Far-end interference detection device obtain far-end execute disturb base station physical base station mark PCI and far-end execute disturb between base station radio transmission distance, far-end execute disturb the frequency configuration information of base station, far-end is executed and is disturbed base station azimuth information；
Far-end interference detection device is when detecting that far-end executes the frequency accordant configuration information disturbing the frequency configuration information of base station and disturbed base station, the far-end with PCI of the frequency accordant configuration information of reservation and disturbed base station is executed and is disturbed base station, and acquisition the first reservation far-end is executed and disturbed base station；
First reservation far-end is executed each far-end disturbed in base station and is executed and disturb base station and make comparisons with corresponding radio transmission distance with the geographic distance of disturbed base station by far-end interference detection device, comparative result instruction far-end execute disturb base station and disturbed base station geographic distance with corresponding radio transmission range difference in the range of predictive error time, retain and there is the described far-end of PCI execute and disturb base station, obtain the second reservation far-end and execute and disturb base station；
Far-end interference detection device obtains the second reservation far-end and executes the azimuth information disturbing base station, far-end execute disturb base station azimuth information instruction in the range of error of the antenna directional angle of disturbed base station time, retain and there is the described far-end of PCI execute and disturb base station, determine that the far-end with PCI corresponding to disturbed base station is executed and disturb station list.
Wherein, described far-end interference detection device obtain far-end execute disturb base station physical base station mark PCI step include:
The interference signal that non-downlink character position is received in time domain by far-end interference detection device is sampled, and obtains interference signal sampled data after over-sampling；
It is relevant that far-end interference detection device uses PSS sequence to carry out slip to described sampled data, obtains the peak information of PSS signal；
Peak information and a predetermined detection threshold value of the described PSS signal got are made comparisons by far-end interference detection device, obtain comparative result；
Far-end interference detection device, when comparative result indicates the peak value of described PSS signal more than described predetermined detection threshold value, determines and PSS signal detected；
According to SSS signal and PSS signal, regular time difference in time domain determines the time-domain position of SSS signal detection to far-end interference detection device, carries out the coherent detection of SSS sequence, obtains SSS sequence；
Far-end interference detection device according to PSS sequence and SSS combined sequence obtain far-end execute disturb base station physical base station mark PCI.
Wherein, described far-end interference detection device obtains and far-end is executed the step of the radio transmission distance disturbed between base station and included:
Far-end interference detection device obtains PSS signal peak and obtains moment and far-end and execute and disturb base station and send the time difference in this PSS signal moment, obtains Transmission Time Interval；
Far-end interference detection device, according to described Transmission Time Interval and electromagnetic transmission speed, obtains and far-end executes the radio transmission distance disturbed between base station.
Wherein, described far-end interference detection device determines that the far-end of correspondence is executed and disturbs the step of base station information and include:
Far-end interference detection device is preset under mechanism one, the disturbed base station of other far-ends in transmission far-end interference detection information to preset range；Wherein, described far-end interference detection information includes: the identification information of base station；Described mechanism in order to ensure within a scheduled time only have one disturbed base station send described far-end interference detection information, and in order to determine each disturbed base station send described far-end interference detection information time point；The described disturbed base station of other far-ends is also all far-end and executes and disturb base station；
Far-end interference detection device statistics receives described far-end interference detection information and parses the quantity information of the disturbed base station of other far-ends of identification information of described disturbed base station, determines that far-end is executed and disturbs station list.
In order to solve above-mentioned technical problem, embodiments of the invention also provide for a kind of far-end interference based on TD-LTE system detection device, wherein, including:
Detection module; for detecting the intensity of non-downlink character position experienced interference signal; described non-downlink character position includes the uplink symbol in protection time slot, uplink pilot time slot and sub-frame of uplink and is configured to downlink symbol transmitting position; but the descending unactual position sending symbol, described uplink symbol is received by the disturbed base station corresponding with described far-end interference detection device；
Judge module, for judging whether the intensity of described interference signal reduces along with the increase of the positional distance between non-downlink character position and transfer point, described transfer point refers to that base station down sends the time point turning uplink receiving；
First determines module, for when judge module is judged as YES, it is determined that disturbed base station is executed by far-end and disturbed base station and disturbed.
Wherein, described far-end interference detection device also includes:
Second determines module, disturbs base station information for determining that far-end corresponding to disturbed base station is executed.
Wherein, described detection module includes:
Divide submodule, for non-downlink character position is divided into N number of tim e-domain detection window in time domain；
Numbering submodule, for described N number of tim e-domain detection window by apart from described transfer point by closely carrying out serial number to remote order；
First obtains submodule, for calculating the interference signal intensity in each detection window, obtains the interference signal intensity meansigma methods in each detection window.
Wherein, described first acquisition submodule includes:
First computing unit, for selecting predetermined frequency domain resource to calculate the intensity of non-downlink character position experienced interference signal, described predetermined frequency domain resource includes: the frequency domain resource that Physical Broadcast Channel PBCH takies, and/or the frequency domain resource that master sync signal PSS/ auxiliary synchronous signals SSS takies；Or
Second computing unit, is used for selecting full bandwidth frequency domain resource to calculate non-downlink character position experienced interference signal intensity.
Wherein, described judge module includes:
Judging submodule, whether the interference signal intensity meansigma methods in judging later tim e-domain detection window is less than the interference signal intensity meansigma methods in adjacent previous tim e-domain detection window；Or the ratio that the difference of the interference signal intensity meansigma methods in previous tim e-domain detection window and the interference signal intensity meansigma methods in adjacent later tim e-domain detection window is more than 0 is more than a predetermined threshold value.
Wherein, described second determines that module includes:
Second obtain submodule, for obtain far-end execute disturb base station physical base station mark PCI and far-end execute disturb between base station radio transmission distance, far-end execute disturb the frequency configuration information of base station, far-end is executed and is disturbed base station azimuth information；
3rd obtains submodule, for when detecting that far-end executes the frequency accordant configuration information disturbing the frequency configuration information of base station and disturbed base station, the far-end with PCI of the frequency accordant configuration information of reservation and disturbed base station is executed and is disturbed base station, and acquisition the first reservation far-end is executed and disturbed base station；
4th obtains submodule, execute and disturb base station for the first reservation far-end being executed each far-end disturbed in base station and make comparisons with corresponding radio transmission distance with the geographic distance of disturbed base station, comparative result instruction far-end execute disturb base station and disturbed base station geographic distance with corresponding radio transmission range difference in the range of predictive error time, retain and there is the described far-end of PCI execute and disturb base station, obtain the second reservation far-end and execute and disturb base station；
First determines submodule, the azimuth information disturbing base station is executed for acquisition the second reservation far-end, far-end execute disturb base station azimuth information instruction in the range of error of the antenna directional angle of disturbed base station time, retain and there is the described far-end of PCI execute and disturb base station, determine that the far-end with PCI corresponding to disturbed base station is executed and disturb station list.
Wherein, described second acquisition submodule includes:
First acquiring unit, samples for the interference signal received non-downlink character position in time domain, obtains interference signal sampled data after over-sampling；
Second acquisition unit, is used for using PSS sequence to carry out slip to described sampled data relevant, obtains the peak information of PSS signal；
3rd acquiring unit, for peak information and a predetermined detection threshold value of the described PSS signal got being made comparisons, obtains comparative result；
Determine unit, during for indicating at comparative result the peak value of described PSS signal to be more than described predetermined detection threshold value, determine and PSS signal detected；
4th acquiring unit, determines the time-domain position of SSS signal detection for the regular time difference in time domain according to SSS signal and PSS signal, carries out the coherent detection of SSS sequence, obtain SSS sequence；
5th acquiring unit, for according to PSS sequence and SSS combined sequence obtain far-end execute disturb base station physical base station mark PCI.
Wherein, described second acquisition submodule also includes:
6th acquiring unit, obtains moment and far-end and executes for obtaining PSS signal peak and disturb base station and send the time difference in this PSS signal moment, obtain Transmission Time Interval；
7th acquiring unit, for according to described Transmission Time Interval and electromagnetic transmission speed, obtains and far-end executes the radio transmission distance disturbed between base station.
Wherein, described second determines that module also includes:
Send submodule, the disturbed base station of other far-ends for presetting under mechanism, in transmission far-end interference detection information to preset range；Wherein, described far-end interference detection information includes: the identification information of base station；Described mechanism in order to ensure within a scheduled time only have one disturbed base station send described far-end interference detection information, and in order to determine each disturbed base station send described far-end interference detection information time point；The described disturbed base station of other far-ends is also all far-end and executes and disturb base station；
Second determines submodule, receives described far-end interference detection information for statistics and parses the quantity information of the disturbed base station of other far-ends of identification information of described disturbed base station, determining that far-end is executed and disturb station list.
Having the beneficial effect that of the technique scheme of the present invention:
The solution of the present invention uses and non-downlink character position is divided into multiple detection window, and to the plurality of detection window by apart from described transfer point by closely carrying out serial number to remote order, and judge whether the interference signal intensity meansigma methods in later detection window is less than the interference signal intensity meansigma methods in adjacent previous detection window, or the interference signal intensity meansigma methods in previous tim e-domain detection window is more than the ratio of 0 more than a predetermined threshold value with the difference of the interference signal intensity meansigma methods in adjacent later tim e-domain detection window；If if, i.e. determine and receive far-end interference.Whether base station, by far-end interference, thus further helps in and follow-up determine that far-end is executed and disturb base station information to use the solution of the present invention to detect accurately.
Accompanying drawing explanation
Fig. 1 represents far-end interference hangover specificity analysis figure；
Fig. 2 represents the frame structure configuration figure of TD-LTE system；
Fig. 3 represents when TD-LTE system uses Cyclic Prefix, special subframe configuration figure；
Fig. 4 represents frame structure type 2, the physical channel scattergram of special subframe Configuration Type 7；
Fig. 5 represents and interferes with each other schematic diagram between base station；
Fig. 6 represents the interference schematic diagram that different propagation distance is brought；
Fig. 7 represents the far-end interference detection method schematic flow sheet based on TD-LTE system of the present invention；
Fig. 8 represents that far-end interference time domain judges window；
Fig. 9 represents the far-end interference structure of the detecting device schematic diagram one based on TD-LTE system of the present invention；
Figure 10 represents the far-end interference structure of the detecting device schematic diagram two based on TD-LTE system of the present invention；
Figure 11 represents the detection module structural representation in far-end interference based on the TD-LTE system detection device of the present invention；
Figure 12 represents that in far-end interference based on the TD-LTE system detection device of the present invention second determines modular structure schematic diagram one；
Figure 13 represents the second acquisition sub modular structure schematic diagram in far-end interference based on the TD-LTE system detection device of the present invention；
Figure 14 represents that in far-end interference based on the TD-LTE system detection device of the present invention second determines modular structure schematic diagram two.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, it is described in detail below in conjunction with the accompanying drawings and the specific embodiments.
At two kinds of duplex modes, FDD (FrequencyDivisionDuplexing) and TDD (TimeDivisionDuplexing) defined in LTE (LongTermEvolution) technology of forth generation mobile communication 4G (4thGeneration) of 3GPP (the3rdGenerationPartnerProject) standard definition.In TDDLTE (TD-LTE used below represents TDDLTE) system, the Uu that eats dishes without rice or wine between user terminal and base station equipment uses the time to distinguish uplink and downlink.
Definition frame structure is the basis defining physical channel and air interface synchronization etc., the frame structure of TD-LTE, the radio frames of 10ms is as the ultimate unit of frame structure, the radio frames of 10ms is subdivided into the subframe of 10 1ms, one subcarrier width of the frequency domain of LTE is 15khz, amount to 2048 point samplings, corresponding sample rate is 2048*15khz, the persistent period of one sampling point is 1/ (30720*k), i.e. number of samples within 1ms is 30720 sampled points (rear extended meeting uses symbol Ts to characterize).
For TD-LTE system, subframe type is divided three classes, descending sub frame, sub-frame of uplink and special subframe, as shown in Figure 2, demand according to business etc. is different, can more be configured flexibly the frame structure index of TD-LTE, as a example by Fig. 3 configuration index 2, the radio frames of 1 10ms is made up of the field of 2 identical 5ms, the field of each 5ms comprises 3 class subframes, " D " represents descending sub frame, and " S " represents special subframe, and " U " represents sub-frame of uplink.
The time span of corresponding 2048 sampled points of OFDM (OFDM) symbol from the angle of time domain, for the problem solving the intersymbol interference that intersymbol causes due to the delay spread of wireless signal, LTE system introduces CP (Cyclic Prefix) technology of ofdm system and antagonism intersymbol is interfered problem, to reduce the complexity of receiver algorithm.
The expense brought in view of CP, 1ms 30720 sampled points altogether are divided into again 14 OFDM symbol, wherein a length of 160 Ts of the cyclic prefix CP of the 1st and the 8th OFDM symbol, a length of 144 Ts of the Cyclic Prefix of remaining 12 symbol.Up, descending and special subframe OFDM symbol all follows this rule.
As shown in Figure 3; special subframe is further split into being three class time slots; DWPTS (descending pilot frequency time slot), GP (protection time slot) and UPPTS (uplink pilot time slot), can correspondingly arrange special subframe configuration according to coverage distance demand etc..Such as, as a example by sub-frame configuration 6, the ratio of the symbolic number of DWPTS, GP and UPPTS Time Slot Occupancy is 9:3:2.
Lower Fig. 4 gives frame structure type 2, and several Main physical channels of special subframe configuration 7 and signal distributions position, wherein CRS (CellReferenceSignal) signal distributions is at the DWPTS time slot of descending sub frame and special subframe.CRS is relevant with the antenna port configuration of base station with the concrete distributing position of frequency domain in time domain, and in the case of two ports of base station level, CRS is distributed on the 1st and the 5th symbol of time domain, and CRS is distributed in subcarrier number mould 3 equal on the position of 0 on frequency domain.
Physical Broadcast Channel PBCH (physicalBroadcastChannel) is distributed in the radio frames numbering mould 2 position equal to 0 (even number radio frames) in time domain, specifically being distributed in radio frames on the 1 to 4th these 4 symbols of the 2nd time slot of first descending sub frame, on frequency domain, PBCH is distributed on 72 subcarriers in the middle of whole frequency domain.
On last symbol of first subframe that auxiliary synchronous signals SSS (SecondarySynchronizationSignal) is positioned at each field, frequency domain is positioned on 62 subcarriers in the middle of frequency domain.Master sync signal PSS (PrimarySynchronizationSignal) is positioned on the 3rd symbol of special subframe (second subframe) of each field, frequency domain is positioned on 62 subcarriers in the middle of frequency domain.
By uplink and downlink timing separation in TDD, in order to avoid interference at crossed slot between near-end base station, need between base station to introduce synchronization mechanism, the base station of such as TDD realizes synchronizing, to avoid the interference problem between base station close together between base station by the dipper system of external GPS synchronizing signal or China's independent intellectual property right.Near-end base station interference problem is mainly manifested in, and base station distance is relatively near, and the loss of electromagnetic wave propagation is relatively small, if it is asynchronous between base station nearer in TDD system, then execute and disturb the wireless signal that base station sends and received by in-plant base station, bring stronger interference, have a strong impact on communication quality.By introducing the synchronization mechanism between base station, it is ensured that near-end base station sends and receives simultaneously simultaneously, such that it is able to the problem that the wireless signal avoiding certain base station to send is received by other base stations of near-end.
As it has been described above, the interference problem between near-end base station can be avoided by introducing the synchronization mechanism between base station, but in actual network operation practice, under the scene that some is special, however it remains the problem of telepoint base station interference.It is illustrated in fig. 5 shown below, execute and disturb synchronized transmission and reception wireless signal between base station and disturbed base station, but under the scene that some is special, such as in the case of air humidity is bigger, there is atmospheric duct effects in electromagnetic transmission, the signal causing the base station beyond tens kilometers of kilometers the most hundreds of to send is received by disturbed base station by atmospheric duct effects, brings disturbed base station uplink interference problem.
Shown in Fig. 5 and Fig. 6, when propagation distance is 300km, corresponding propagation delay 1ms, use path loss 150.3dB that free space propagation model is corresponding, the interference lifting 7dB brought；The symbol of the 9th downlink executing the special subframe disturbing base station arrives, through propagating of 300km, the 9th symbol that disturbed base station is up.With reference to figure 4 above, the CRS of the 8th symbol executing the special subframe disturbing base station brings the interference of 8th symbol up to disturbed base station.The PSS signal executing the special subframe disturbing base station brings the interference to the 3rd symbol in disturbed base station, and the PSS executing first subframe disturbing base station brings the interference to the 2nd symbol of UPPTS.
When propagation distance is 364km, corresponding propagation delay 1.22ms, path loss 152dB, disturb lifting 5.3dB.The symbol of the 9th downlink executing the special subframe disturbing base station arrives, through propagating of 364km, the 12nd symbol that disturbed base station is up.With reference to figure 4 above, the CRS of the 8th symbol executing the special subframe disturbing base station brings the interference of 11st symbol up to disturbed base station.The PSS signal executing the special subframe disturbing base station brings the interference to the 6th symbol in disturbed base station, and the PSS executing first subframe disturbing base station brings the interference of the to sub-frame of uplink the 3rd symbol.
To sum up analyze, front 9 symbols of UPPTS time slot and sub-frame of uplink are disturbed disturbing of base station by propagation distance 1 and executing of propagation distance 2 simultaneously, the feature that can obtain far-end interference similarly is: the uplink symbol experienced interference signal the nearest with descending sub frame time interval is the most, and interference signal intensity is the strongest.
Based on above-mentioned analysis, the far-end interference detection method of the TD-LTE system of the present invention, as it is shown in fig. 7, comprises following steps:
Step 71; far-end interference detection device detects the intensity of non-downlink character position experienced interference signal; described non-downlink character position includes the uplink symbol in protection time slot, uplink pilot time slot and sub-frame of uplink and is configured to downlink symbol transmitting position; but the descending unactual position sending symbol, described uplink symbol is received by the disturbed base station corresponding with described far-end interference detection device；
Step 72, far-end interference detection device judges whether the intensity of described interference signal reduces along with the increase of the positional distance between non-downlink character position and transfer point, and described transfer point refers to that base station down sends the time point turning uplink receiving；
Step 73, the most then far-end interference detection device determines that disturbed base station is executed by far-end and disturbs base station and disturbed.
Below in conjunction with accompanying drawing and specific embodiment, above-mentioned steps is described in detail to step.
Understanding based on above-mentioned analysis, TD-LTE system far end interfering signal is present in GP, UPPTS and sub-frame of uplink position, and distance descending sub frame turns the biggest of interference signal that the nearest position of sub-frame of uplink transfer point receives.Being illustrated in fig. 8 shown below, the experienced interference of GP position is more than the interference of sub-frame of uplink more than UPPTS interference under normal circumstances, and from the angle of time domain, the position experienced interference that in sub-frame of uplink, transfer point described in distance is the nearest is the biggest.
Distance descending sub frame is to the nearest position of sub-frame of uplink transfer point (symbol in time domain or be configured to downlink symbol and launch position, but the descending unactual position sending symbol,) to disturb the strongest feature be also far-end interference and the main distinction of other types interference, synchronize between base station in such as TDD system, GP time slot will not by around the uplink service that brings of the user terminal of nearer homogeneous-frequency adjacent-domain disturb.The uplink interference signal power that sub-frame of uplink inner periphery brings with the UE of the adjacent base station of frequency is in a basic balance at the intersymbol of time domain, does not haves obvious intersymbol power difference problem, and the interference signal intensity of distinct symbols is identical.
According to above-mentioned analysis, it is judged that can be achieved in that by the method for far-end interference
(this device can be disturbed base station to far-end interference detection device, it can also be a part for disturbed base station, can also be associated with disturbed base station, it is positioned near disturbed base station) according to being configured to downlink symbol transmitting position, but descending actual send symbol position (include GP and or UPPTS and or sub-frame of uplink in uplink symbol and be configured to downlink symbol and launch position, but the descending actual position sending symbol) in time domain, difference at the signal intensity that is interfered judges whether by far-end interference.The judgment mode of non-downlink character position time domain internal interference signal intensity difference, specifically can by " GP and or UPPTS and or sub-frame of uplink " uplink symbol and be configured to downlink symbol launch position, but the descending unactual position sending symbol is divided into N number of tim e-domain detection window, this N number of tim e-domain detection window can have overlap, can also be non-overlapping, and preferably, detection window length is identical.Calculating the interference signal in each tim e-domain detection window to far each window being carried out serial number successively by near from distance position of conversion point, computational methods include calculating meansigma methods etc..Interference signal after calculating carries out calculus of differences again, and specifically, the meansigma methods calculating adjacent two detection windows carries out difference operation Δ In=In-In+1, n=1 ... N-1；If Δ InFor on the occasion of, or all Δ InThe value ratio more than 0 more than a predetermined threshold value, or Δ In=In+1-In, Δ InFor negative value, or or all Δ InThe value ratio less than 0 more than a predetermined threshold value, then judge by far-end interference.
Wherein, the step that interference signal intensity is calculated by far-end interference detection device includes: far-end interference detection device can select predetermined frequency domain resource to calculate the intensity of non-downlink character position experienced interference signal.This predetermined frequency domain resource includes: the frequency domain resource that Physical Broadcast Channel PBCH takies, and/or the frequency domain resource that master sync signal PSS/ auxiliary synchronous signals SSS takies；Or
Far-end interference detection device selects full bandwidth frequency domain resource to calculate non-downlink character position experienced interference signal intensity.
To sum up, the solution of the present invention can detect that whether base station is by far-end interference accurately.
After determining and receiving far-end interference, determine that far-end corresponding to disturbed base station executes the information disturbing base station:
Existing far-end interference detection technique detects only according to " hangover " characteristic of interference, i.e. assume to disturb " cut-off " at certain symbol of certain sub-frame of uplink, therefore, calculate only according to this symbol ended execute disturb base station with this base station distance, thus location interference source.As shown in Figure 5, assume to disturb signal to arrive disturbed base station through the propagation of propagation distance 2, thus judge that the 12nd character position of sub-frame of uplink is as " hangover " rest position, conclude that distance that telepoint base station disturbs is for " propagation distance 2 " with this, clearly, this detection mode miss out the interference problem brought of the telepoint base station of " propagation distance 1 ", thus causes the leakage detection probability that far-end interference base station is higher.
The solution of the present invention provides two kinds of preferred versions, determines to execute and disturbs base station.
The first scheme:
(1), disturbed base station to execute disturb base station physical base station mark and distance detect；
(2), utilize Base Station Identification, distance, antenna directional angle and frequency configuration information to carry out coupling to determine to execute and disturb base station (i.e. obtain base station name or base station uniquely identifies).
Below (1) is described in detail:
In LTE system, physical base station mark PCI is determined by PSS and SSS is public, 3 PSS sequences and 168 SSS sequences defined in system, and a PSS and SSS determines the PCI of a base station, and each base station has and an only PCI.Amounting to available PCI number is 3 × 168=504, avoids two base stations with frequency of next-door neighbour to use identical PCI under normal circumstances by the way of the network planning.Two base stations beyond certain geographic distance can use identical PCI.
In existing network, PSS and SSS is as the beacon channel of base station, for user terminal, base station is carried out down-going synchronous etc., and in existing mechanism, base station equipment need not detect PSS and SSS.
In the scene of far-end interference, distant base station PSS and SSS signal may travel to the uplink symbol in up " GP and or UPPTS and or the sub-frame of uplink " of near-end base station and be configured to downlink symbol and launch position, but the descending actual position sending symbol.After determining by far-end interference, use PSS sequence pair " GP and or UPPTS and or sub-frame of uplink " in uplink symbol and be configured to downlink symbol launch position, but the descending actual position sending symbol, carries out related operation with detection PSS signal (that receive and after sampling data are mainly carried out related operation by PSS signal detection) and the sync bit of correspondence at the signal received in time domain.Described PSS sync bit refers to, uses PSS sequence to carry out time domain (the relative position in subframe) position at the relevant peak value waiting computing to obtain PSS.
3 PSS sequences of main definitions in LTE system, base station according to predefined base station parameter, selects the PSS specified to be transmitted at PSS delivery time from 3.
Calculate correlation peak and contrast with the thresholding set, if greater than the thresholding set, then it is assumed that there is PSS signal, and determine the moment of PSS relevant peaks；If being not more than the thresholding set, then associated window of sliding；After completing the synchronization of a PSS sequence, then the PSS sequence changing other carries out identical associative operation.Record the position of the relevant peaks of all correspondences and the PSS sequence of correspondence.
After obtaining PSS sequence, determine the time location of SSS signal detection according to regular time difference in SSS and PSS time domain further, carry out the coherent detection of SSS sequence, obtain SSS sequence, obtain PCI according to PSS and SSS combined sequence.Specifically, PSS signal and SSS signal differ 3 OFDM symbol, corresponding 2496 sampling points in time domain.After obtaining PSS correlation peak, the timing according to SSS Yu PSS is poor, obtains the sync bit of SSS, uses the related detecting method being similar to PSS to obtain SSS sequence on this sync bit.SSS sequence and corresponding PSS sequence composition base station physical mark PCI.
After the above-mentioned detection obtaining PSS relevant peaks, obtain Transmission Time Interval T according to the time difference of the relevant peaks time of reception and the delivery time of Reference BTSdifference=TRsPss-TTxPss, wherein, TRsPssFor PSS relevant peaks time of reception, TTxPssOn the basis of base station send this PSS moment.Specifically PSS delivery time is positioned at the 3rd symbol of special subframe, detect that time corresponding to the position of PSS correlation peak deducts Reference BTS PSS delivery time and obtains time difference and be the propagation time, according to transmission time and electromagnetic transmission speed C=3.0 × 108M/s, obtains L=C × Tdifference.Thus obtain the radio transmission distance between interference source base station and disturbed base station.
Below (2) are described in detail:
After disturbing the PCI of base station according to executing of obtaining in (1) and execute the radio transmission distance disturbed between base station and disturbed base station, disturb according to executing of detecting the frequency configuration etc. of the PCI of base station, propagation distance, the antenna directional angle of disturbed base station, disturbed base station to execute disturb base station mate station list is disturbed to executing in certain disturbed base station.Wherein, concrete matching process is as follows:
The process of concrete coupling includes: in network, the configuration of the frequency in all candidate BS engineering parameters base station identical with disturbed base station frequency point configuration carries out retaining and be further processed (base station that frequency configuration differs eliminates candidate BS list).Further, candidate BS is mated by the PCI list using executing of detecting of far-end interference detection module to disturb base station, is i.e. present in and executes the base station disturbed in the PCI list of base station and be retained, and is not excluded executing the base station disturbed in the PCI list of base station.Further, calculate the geographic distance between candidate BS and disturbed base station, and with (1) in obtain execute and disturb the radio transmission distance of base station and disturbed base station and compare, error base station within the specific limits is retained, and the base station exceeding certain error is excluded.Further, within calculating the range of error whether line between candidate BS and disturbed base station is positioned at disturbed base station deflection, if in the range of error of disturbed base station, position, then this base station is retained, and otherwise, this base station is excluded.
After completing said process, i.e. obtaining this corresponding executing in disturbed base station and disturb station list, record and preserve disturbed base station, execute and disturb station list, each executes the engineering parameter information etc. disturbing base station.
First scheme:
(1), far-end interference detection device preset under mechanism one, send far-end interference detection information to the disturbed base station of other far-ends in preset range；Wherein, described far-end interference detection information includes: the identification information of base station；Described mechanism in order to ensure within a scheduled time only have one disturbed base station send described far-end interference detection information, and in order to determine each disturbed base station send described far-end interference detection information time point；The described disturbed base station of other far-ends is also all far-end and executes and disturb base station；
(2), far-end interference detection device statistics receive described far-end interference detection information and parse the quantity information of the disturbed base station of other far-ends of identification information of described disturbed base station, determine that far-end is executed and disturb station list.
Below above-mentioned (one) is described in detail to (two):
TDD system uplink and downlink use identical frequency, the wireless channel of TDD system has good reciprocity, i.e. execute the propagation characteristic disturbing the wireless channel that base station sends signal to disturbed base station down, with disturbed base station is similar to executing the propagation characteristic disturbing base station uplink wireless channel.Disturbed base station is executed while disturbing base station far-end interference, disturbs base station bring far-end interference to executing too.
For detecting the presence of the base station of far-end interference problem, far-end interference detection information sending module receives window with specific objective and arranges the Timing Advance of described far-end interference detection information, and sends to other base stations that there is far-end interference problem.Be deployed in exist far-end interference problem base station location far-end interference information receive and detection module predefined intended recipient window to described far-end interference detection information be received and detect.
Described far-end interference detection information includes base station identification information, and wherein this base station identification information includes: specific far-end interference detects particular sequence and/or detects the unique identification information of the base station that information sending module associates with far-end interference.Far-end interference particular sequence can use and be similar to ZC sequence, Gold sequence or m-sequence etc. (the PSS sequence mentioned in the present invention belongs to ZC sequence, and SSS sequence is m-sequence).The LTE base station level of base station associated with far-end interference detection information sending module be uniquely designated E-CGI (E-UTRANCellGlobalIdentification).Wherein E-CGI is made up of two parts, PLMNID (PLMNIdentifier, public land mobile network identifies) and ECI (E-UTRANCellIdentity, wireless access network Base Station Identification), wherein PLMNID includes again MCC (mobilecountrycode, mobile country code) and MNC (mobilenetworkcode, mobile network code, MNC).
For ensureing that far-end interference receives and the reliability (avoiding multiple far-end interference detection information sending module to send the interference problem caused) of detection simultaneously, the mechanism that a kind of far-end interference detection information synergism sends is proposed the most here, i.e. control at most to be detected information sending module by the far-end interference of a base station association that there is far-end interference and be transmitted putting at the same time, below described cooperative transmitter system be described:
The frame number that definition far-end interference detection information sends, definition frame number mark collaborative with far-end interference associates, control at each frame, only have the collaborative mark association of far-end interference, namely in same frame, only have the far-end interference information sending module that a base station is associated sending far-end interference detection information.
First the embodiment of interference synergic mark is introduced, base station information by far-end is added up according to the method described in step (1) and collects by the cooperative module (hereinafter referred to as far-end interference cooperative module) that far-end interference detection information multiple spot sends, and uniquely identify (E-CGI) order from small to large according to base station and work in coordination with the mark of transmission to each one far-end interference of the base station order-assigned being interfered, the far-end interference of different base station is collaborative sends mark difference, each base station that i.e. there is far-end interference distributes one, uniquely, and the far-end interference of serial number collaborative mark icid (interferencecoordinationidentity).
Next the concurrency controlling mechanism that far-end interference sends is introduced, in order to realize the frame synchronization between UE and base station in existing LTE system, system defines 4096 radio frames and numbers from 0 to 4095, and a length of 10ms of each radio-frame time, system changes radio frames again and again.
If detected region having the problem base station of 4096 far-end interference just, it is possible to the far-end interference information sending module of the base station association that definition system frame number SFN is identical with icid performs transmission.Under normal circumstances, the base station number that there is far-end interference problem is the most just equal to the number 4096 of SFN, and, in order to improve detection reliability, the far-end interference detection module typically requiring transference certain far-end interference base station association repeatedly sends far-end interference detection information, and same base station also needs to carry out sliding at different sliding windows send.Therefore, the cooperative transmitter system of far-end interference information generally is given below.
Define M transmission window Mwin of each far-end interference base station association, each transmission window correspondence K radio frames Krfn (having twice send opportunity in each radio frames), need the collaborative base station sending far-end interference information to have Nicid.
Obtain sending the radio frames that a round needs according to Mwin × Krfn × Nicid, define log2(Mwin × Krfn × Nicid) (takes the log logarithm with 2 as the end, and rounds in result).For interference coordination superframe (HicFN, the superframe that interference synergic sends) sum, HicFN=m_win × k_rfn × n_icid, send the transmission time point of kth _ rfn radio frames of window at m_win for the base station of numbered n_icid.
I.e. it can be controlled in identical time point by above-mentioned mechanism and only have the base station transmission far-end interference detection information that a far-end interference is relevant.
Far-end interference information receives and described far-end interference detection information is received and detects at predefined intended recipient window by detection module, after the identification information receiving far-end interference detection information and parsing receives far-end interference detection information disturbed base station described in transmission, set up and receive with far-end interference information and disturbed base station and far-end interference that detection module associates detect the disturbed base station association relation that information sending module associates.
To sum up, present invention Dingyuan end really is executed and is disturbed the scheme of base station and can reduce far-end and execute the leakage detection probability disturbing base station.
As it is shown in figure 9, embodiments of the invention offer a kind of far-end interference based on TD-LTE system detection device, wherein, including:
Detection module 91; for detecting the intensity of non-downlink character position experienced interference signal; described non-downlink character position includes the uplink symbol in protection time slot, uplink pilot time slot and sub-frame of uplink and is configured to downlink symbol transmitting position; but the descending unactual position sending symbol, described uplink symbol is received by the disturbed base station corresponding with described far-end interference detection device；
Judge module 92, for judging whether the intensity of described interference signal reduces along with the increase of the positional distance between non-downlink character position and transfer point, described transfer point refers to that base station down sends the time point turning uplink receiving；
First determines module 93, for when judge module is judged as YES, it is determined that disturbed base station is executed by far-end and disturbed base station and disturbed.
Wherein, as shown in Figure 10, far-end interference detection device also includes:
Second determines module 101, disturbs base station information for determining that far-end corresponding to disturbed base station is executed.
Wherein, described detection module 91, as shown in figure 11, including:
Divide submodule 110, for non-downlink character position is divided into N number of tim e-domain detection window in time domain；
Numbering submodule 111, for described N number of tim e-domain detection window by apart from described transfer point by closely carrying out serial number to remote order；
First obtains submodule 112, for calculating the interference signal intensity in each detection window, obtains the interference signal intensity meansigma methods in each detection window.
Wherein, described first acquisition submodule 112 includes:
First computing unit, for selecting predetermined frequency domain resource to calculate the intensity of non-downlink character position experienced interference signal, described predetermined frequency domain resource includes: the frequency domain resource that Physical Broadcast Channel PBCH takies, and/or the frequency domain resource that master sync signal PSS/ auxiliary synchronous signals SSS takies；Or
Second computing unit, is used for selecting full bandwidth frequency domain resource to calculate non-downlink character position experienced interference signal intensity.
Wherein, described judge module 92, including:
Judging submodule, whether the interference signal intensity meansigma methods in judging later tim e-domain detection window is less than the interference signal intensity meansigma methods in adjacent previous tim e-domain detection window；Or the ratio that the difference of the interference signal intensity meansigma methods in previous tim e-domain detection window and the interference signal intensity meansigma methods in adjacent later tim e-domain detection window is more than 0 is more than a predetermined threshold value.
Wherein, described second determines module 101, as shown in figure 12, and including:
Second obtain submodule 120, for obtain far-end execute disturb base station physical base station mark PCI and far-end execute disturb between base station radio transmission distance, far-end execute disturb the frequency configuration information of base station, far-end is executed and is disturbed base station azimuth information；
3rd obtains submodule 121, for when detecting that far-end executes the frequency accordant configuration information disturbing the frequency configuration information of base station and disturbed base station, the far-end with PCI of the frequency accordant configuration information of reservation and disturbed base station is executed and is disturbed base station, and acquisition the first reservation far-end is executed and disturbed base station；
4th obtains submodule 122, execute and disturb base station for the first reservation far-end being executed each far-end disturbed in base station and make comparisons with corresponding radio transmission distance with the geographic distance of disturbed base station, comparative result instruction far-end execute disturb base station and disturbed base station geographic distance with corresponding radio transmission range difference in the range of predictive error time, retain and there is the described far-end of PCI execute and disturb base station, obtain the second reservation far-end and execute and disturb base station；
First determines submodule 123, the azimuth information disturbing base station is executed for acquisition the second reservation far-end, far-end execute disturb base station azimuth information instruction in the range of error of the antenna directional angle of disturbed base station time, retain and there is the described far-end of PCI execute and disturb base station, determine that the far-end with PCI corresponding to disturbed base station is executed and disturb station list.
Wherein, described second acquisition submodule 120, as shown in figure 13, including:
First acquiring unit 131, samples for the interference signal received non-downlink character position in time domain, obtains interference signal sampled data after over-sampling；
Second acquisition unit 132, is used for using PSS sequence to carry out slip to described sampled data relevant, obtains the peak information of PSS signal；
3rd acquiring unit 133, for peak information and a predetermined detection threshold value of the described PSS signal got being made comparisons, obtains comparative result；
Determine unit 134, during for indicating at comparative result the peak value of described PSS signal to be more than described predetermined detection threshold value, determine and PSS signal detected；
4th acquiring unit 135, determines the time-domain position of SSS signal detection for the regular time difference in time domain according to SSS signal and PSS signal, carries out the coherent detection of SSS sequence, obtain SSS sequence；
5th acquiring unit 136, for according to PSS sequence and SSS combined sequence obtain far-end execute disturb base station physical base station mark PCI.
Wherein, described second obtains submodule 120, also includes:
6th acquiring unit, obtains moment and far-end and executes for obtaining PSS signal peak and disturb base station and send the time difference in this PSS signal moment, obtain Transmission Time Interval；
7th acquiring unit, for according to described Transmission Time Interval and electromagnetic transmission speed, obtains and far-end executes the radio transmission distance disturbed between base station.
Wherein, described second determines module 101, as shown in figure 14, also includes:
Send submodule 141, the disturbed base station of other far-ends for presetting under mechanism, in transmission far-end interference detection information to preset range；Wherein, described far-end interference detection information includes: the identification information of base station；Described mechanism in order to ensure within a scheduled time only have one disturbed base station send described far-end interference detection information, and in order to determine each disturbed base station send described far-end interference detection information time point；The described disturbed base station of other far-ends is also all far-end and executes and disturb base station；
Second determines submodule 142, receives described far-end interference detection information for statistics and parses the quantity information of the disturbed base station of other far-ends of identification information of described disturbed base station, determining that far-end is executed and disturb station list.
It should be noted that this device is the device including said method, the implementation of the embodiment of said method, be applicable to the embodiment of this device, also can reach identical technique effect.
The above is the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, on the premise of without departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (18)

1. a far-end interference detection method based on TD-LTE system, it is characterised in that including:
Far-end interference detection device detects the intensity of non-downlink character position experienced interference signal; described non-downlink character position includes the uplink symbol in protection time slot, uplink pilot time slot and sub-frame of uplink and is configured to downlink symbol transmitting position; but the descending unactual position sending symbol, described uplink symbol is received by the disturbed base station corresponding with described far-end interference detection device；
Far-end interference detection device judges whether the intensity of described interference signal reduces along with the increase of the positional distance between non-downlink character position and transfer point, and described transfer point refers to that base station down sends the time point turning uplink receiving；
The most then far-end interference detection device determines that disturbed base station is executed by far-end and disturbs base station and disturbed.
Far-end interference detection method the most according to claim 1, it is characterised in that after far-end interference detection device determines that the interference disturbing base station is executed in disturbed base station by far-end, also include:
Far-end interference detection device determines that far-end corresponding to disturbed base station is executed and disturbs base station information.
Far-end interference detection method the most according to claim 1, it is characterised in that the step of the intensity that described far-end interference detection device detects non-downlink character position experienced interference signal includes:
Non-downlink character position is divided into N number of tim e-domain detection window in time domain by far-end interference detection device；
Far-end interference detection device to described N number of tim e-domain detection window by apart from described transfer point by closely carrying out serial number to remote order；
Interference signal intensity in each detection window is calculated by far-end interference detection device, obtains the interference signal intensity meansigma methods in each detection window.
Far-end interference detection method the most according to claim 1, it is characterised in that the step that interference signal intensity is calculated by far-end interference detection device includes:
Far-end interference detection device selects predetermined frequency domain resource to calculate the intensity of non-downlink character position experienced interference signal, described predetermined frequency domain resource includes: the frequency domain resource that Physical Broadcast Channel PBCH takies, and/or the frequency domain resource that master sync signal PSS/ auxiliary synchronous signals SSS takies；Or
Far-end interference detection device selects full bandwidth frequency domain resource to calculate non-downlink character position experienced interference signal intensity.
Far-end interference detection method the most according to claim 3, it is characterized in that, described far-end interference detection device judges that the step whether intensity of described interference signal reduces along with the increase of the positional distance between non-downlink character position and transfer point includes:
Far-end interference detection device judges that whether the interference signal intensity meansigma methods in later tim e-domain detection window is less than the interference signal intensity meansigma methods in adjacent previous tim e-domain detection window；Or the ratio that the difference of the interference signal intensity meansigma methods in previous tim e-domain detection window and the interference signal intensity meansigma methods in adjacent later tim e-domain detection window is more than 0 is more than a predetermined threshold value.
Far-end interference detection method the most according to claim 2, it is characterised in that described far-end interference detection device determines that far-end corresponding to disturbed base station is executed and disturbs the step of base station information and include:
Far-end interference detection device obtain far-end execute disturb base station physical base station mark PCI and far-end execute disturb between base station radio transmission distance, far-end execute disturb the frequency configuration information of base station, far-end is executed and is disturbed base station azimuth information；
Far-end interference detection device is when detecting that far-end executes the frequency accordant configuration information disturbing the frequency configuration information of base station and disturbed base station, the far-end with PCI of the frequency accordant configuration information of reservation and disturbed base station is executed and is disturbed base station, and acquisition the first reservation far-end is executed and disturbed base station；
First reservation far-end is executed each far-end disturbed in base station and is executed and disturb base station and make comparisons with corresponding radio transmission distance with the geographic distance of disturbed base station by far-end interference detection device, comparative result instruction far-end execute disturb base station and disturbed base station geographic distance with corresponding radio transmission range difference in the range of predictive error time, retain and there is the described far-end of PCI execute and disturb base station, obtain the second reservation far-end and execute and disturb base station；
Far-end interference detection device obtains the second reservation far-end and executes the azimuth information disturbing base station, far-end execute disturb base station azimuth information instruction in the range of error of the antenna directional angle of disturbed base station time, retain and there is the described far-end of PCI execute and disturb base station, determine that the far-end with PCI corresponding to disturbed base station is executed and disturb station list.
Far-end interference detection method the most according to claim 6, it is characterised in that described far-end interference detection device acquisition far-end is executed the step of the physical base station mark PCI disturbing base station and included:
The interference signal that non-downlink character position is received in time domain by far-end interference detection device is sampled, and obtains interference signal sampled data after over-sampling；
It is relevant that far-end interference detection device uses PSS sequence to carry out slip to described sampled data, obtains the peak information of PSS signal；
Peak information and a predetermined detection threshold value of the described PSS signal got are made comparisons by far-end interference detection device, obtain comparative result；
Far-end interference detection device, when comparative result indicates the peak value of described PSS signal more than described predetermined detection threshold value, determines and PSS signal detected；
According to SSS signal and PSS signal, regular time difference in time domain determines the time-domain position of SSS signal detection to far-end interference detection device, carries out the coherent detection of SSS sequence, obtains SSS sequence；
Far-end interference detection device according to PSS sequence and SSS combined sequence obtain far-end execute disturb base station physical base station mark PCI.
Far-end interference detection method the most according to claim 7, it is characterised in that the detection device acquisition of described far-end interference and far-end are executed the step of the radio transmission distance disturbed between base station and included:
Far-end interference detection device obtains PSS signal peak and obtains moment and far-end and execute and disturb base station and send the time difference in this PSS signal moment, obtains Transmission Time Interval；
Far-end interference detection device, according to described Transmission Time Interval and electromagnetic transmission speed, obtains and far-end executes the radio transmission distance disturbed between base station.
Far-end interference detection method the most according to claim 2, it is characterised in that described far-end interference detection device determines that the far-end of correspondence is executed and disturbs the step of base station information and include:
Far-end interference detection device is preset under mechanism one, the disturbed base station of other far-ends in transmission far-end interference detection information to preset range；Wherein, described far-end interference detection information includes: the identification information of base station；Described mechanism in order to ensure within a scheduled time only have one disturbed base station send described far-end interference detection information, and in order to determine each disturbed base station send described far-end interference detection information time point；The described disturbed base station of other far-ends is also all far-end and executes and disturb base station；
Far-end interference detection device statistics receives described far-end interference detection information and parses the quantity information of the disturbed base station of other far-ends of identification information of described disturbed base station, determines that far-end is executed and disturbs station list.
10. far-end interference based on a TD-LTE system detection device, it is characterised in that including:
Detection module; for detecting the intensity of non-downlink character position experienced interference signal; described non-downlink character position includes the uplink symbol in protection time slot, uplink pilot time slot and sub-frame of uplink and is configured to downlink symbol transmitting position; but the descending unactual position sending symbol, described uplink symbol is received by the disturbed base station corresponding with described far-end interference detection device；
Judge module, for judging whether the intensity of described interference signal reduces along with the increase of the positional distance between non-downlink character position and transfer point, described transfer point refers to that base station down sends the time point turning uplink receiving；
First determines module, for when judge module is judged as YES, it is determined that disturbed base station is executed by far-end and disturbed base station and disturbed.
11. far-end interference according to claim 10 detection devices, it is characterised in that described far-end interference detection device also includes:
Second determines module, disturbs base station information for determining that far-end corresponding to disturbed base station is executed.
12. far-end interference according to claim 10 detection devices, it is characterised in that described detection module includes:
Divide submodule, for non-downlink character position is divided into N number of tim e-domain detection window in time domain；
Numbering submodule, for described N number of tim e-domain detection window by apart from described transfer point by closely carrying out serial number to remote order；
First obtains submodule, for calculating the interference signal intensity in each detection window, obtains the interference signal intensity meansigma methods in each detection window.
13. far-end interference according to claim 10 detection devices, it is characterised in that described first obtains submodule includes:
First computing unit, for selecting predetermined frequency domain resource to calculate the intensity of non-downlink character position experienced interference signal, described predetermined frequency domain resource includes: the frequency domain resource that Physical Broadcast Channel PBCH takies, and/or the frequency domain resource that master sync signal PSS/ auxiliary synchronous signals SSS takies；Or
Second computing unit, is used for selecting full bandwidth frequency domain resource to calculate non-downlink character position experienced interference signal intensity.
14. far-end interference according to claim 12 detection devices, it is characterised in that described judge module includes:
Judging submodule, whether the interference signal intensity meansigma methods in judging later tim e-domain detection window is less than the interference signal intensity meansigma methods in adjacent previous tim e-domain detection window；Or the ratio that the difference of the interference signal intensity meansigma methods in previous tim e-domain detection window and the interference signal intensity meansigma methods in adjacent later tim e-domain detection window is more than 0 is more than a predetermined threshold value.
15. far-end interference according to claim 11 detection devices, it is characterised in that described second determines that module includes:
Second obtain submodule, for obtain far-end execute disturb base station physical base station mark PCI and far-end execute disturb between base station radio transmission distance, far-end execute disturb the frequency configuration information of base station, far-end is executed and is disturbed base station azimuth information；
3rd obtains submodule, for when detecting that far-end executes the frequency accordant configuration information disturbing the frequency configuration information of base station and disturbed base station, the far-end with PCI of the frequency accordant configuration information of reservation and disturbed base station is executed and is disturbed base station, and acquisition the first reservation far-end is executed and disturbed base station；
4th obtains submodule, execute and disturb base station for the first reservation far-end being executed each far-end disturbed in base station and make comparisons with corresponding radio transmission distance with the geographic distance of disturbed base station, comparative result instruction far-end execute disturb base station and disturbed base station geographic distance with corresponding radio transmission range difference in the range of predictive error time, retain and there is the described far-end of PCI execute and disturb base station, obtain the second reservation far-end and execute and disturb base station；
First determines submodule, the azimuth information disturbing base station is executed for acquisition the second reservation far-end, far-end execute disturb base station azimuth information instruction in the range of error of the antenna directional angle of disturbed base station time, retain and there is the described far-end of PCI execute and disturb base station, determine that the far-end with PCI corresponding to disturbed base station is executed and disturb station list.
16. far-end interference according to claim 15 detection devices, it is characterised in that described second obtains submodule includes:
First acquiring unit, samples for the interference signal received non-downlink character position in time domain, obtains interference signal sampled data after over-sampling；
Second acquisition unit, is used for using PSS sequence to carry out slip to described sampled data relevant, obtains the peak information of PSS signal；
3rd acquiring unit, for peak information and a predetermined detection threshold value of the described PSS signal got being made comparisons, obtains comparative result；
Determine unit, during for indicating at comparative result the peak value of described PSS signal to be more than described predetermined detection threshold value, determine and PSS signal detected；
4th acquiring unit, determines the time-domain position of SSS signal detection for the regular time difference in time domain according to SSS signal and PSS signal, carries out the coherent detection of SSS sequence, obtain SSS sequence；
5th acquiring unit, for according to PSS sequence and SSS combined sequence obtain far-end execute disturb base station physical base station mark PCI.
17. far-end interference according to claim 16 detection devices, it is characterised in that described second obtains submodule also includes:
6th acquiring unit, obtains moment and far-end and executes for obtaining PSS signal peak and disturb base station and send the time difference in this PSS signal moment, obtain Transmission Time Interval；
7th acquiring unit, for according to described Transmission Time Interval and electromagnetic transmission speed, obtains and far-end executes the radio transmission distance disturbed between base station.
18. far-end interference according to claim 11 detection devices, it is characterised in that described second determines that module also includes:
Send submodule, the disturbed base station of other far-ends for presetting under mechanism, in transmission far-end interference detection information to preset range；Wherein, described far-end interference detection information includes: the identification information of base station；Described mechanism in order to ensure within a scheduled time only have one disturbed base station send described far-end interference detection information, and in order to determine each disturbed base station send described far-end interference detection information time point；The described disturbed base station of other far-ends is also all far-end and executes and disturb base station；
Second determines submodule, receives described far-end interference detection information for statistics and parses the quantity information of the disturbed base station of other far-ends of identification information of described disturbed base station, determining that far-end is executed and disturb station list.
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CN107888318A (en) * 2016-09-30 2018-04-06 中国移动通信有限公司研究院 Interference analysis method and device
CN108243444A (en) * 2016-12-26 2018-07-03 大唐移动通信设备有限公司 A kind of method and device of Interference Detection
CN108632857A (en) * 2017-03-24 2018-10-09 中国移动通信有限公司研究院 Downlink signal transmission, device, computer readable storage medium and base station
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