CN102655652A - Method and equipment for detecting far-end interference - Google Patents
Method and equipment for detecting far-end interference Download PDFInfo
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Abstract
The invention discloses a method and equipment for detecting far-end interference. The method comprises the following steps that: base station equipment acquires a receiving signal of a far-end interference measurement subframe; and the base station equipment detects the receiving signal and determines whether far-end interference exists or does not exist according to the detection result. According to the embodiments, the base station equipment can detect the far-end interference by judging whether the power of the receiving signal at an appointed measurement position is trailed according to the characteristic that the power of the signal is trailed when a far-end interference signal reaches a cell, so that the far-end interference can be monitored in real time; once the far-end interference is found, the base station equipment can sound an alarm immediately and supply a measurement basis to a network optimization worker for taking corresponding far-end interference solution measures.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a device for detecting far-end interference.
Background
The TD-LTE (TD-SCDMA Long Term Evolution) system adopts a time division duplex mode, and different base stations need to keep synchronization. When a far-end base station reaches a certain height level and a low-altitude atmospheric waveguide phenomenon exists (at the moment, propagation is similar to free space, signals can bypass a ground plane to realize over-the-horizon transmission), a Downlink signal transmitted by an interference base station in a high power mode in a conventional Downlink subframe and a DwPTS (Downlink Pilot Time Slot) may arrive at an Uplink Pilot Time Slot (UpPTS) of the interfered base station after propagation delay, and therefore the UpPTS of the interfered base station and even the receiving of Uplink service data are affected. As shown in fig. 1, which is a schematic diagram of a TD-LTE far-end interference scenario, in fig. 1, far-end interference is represented by a downlink signal of only one base station, but in an actual environment, the far-end interference may be a result of a cluster of base stations in close proximity to each other, that is, an interference signal may be an alias of downlink signals of multiple base stations.
As shown in fig. 2, a TDD (Time division duplexing) frame structure (5ms switching interval) adopting TYPE2 (TYPE 2) in the TD-LTE system is shown, and a special subframe of the frame structure includes three special Time slots: DwPTS, GP (guard time slot), and UpPTS; a DwPTS transmits a PSS (Primary Synchronization Signal), a PCFICH (Physical Control Format Indicator Channel), a PDCCH (Physical downlink Control Channel), a PHICH (Physical harq indication Channel), a PDSCH (Physical downlink shared Channel), and the like among cell downlink Synchronization signals; UpPTS transmits PRACH (Packet random access Channel) and SRS (Sounding Reference Signal), and cannot transmit PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel); GP is a guard time interval between DwPTS and UpPTS, mainly to avoid interference of data in DwPTS to data in UpPTS due to multipath delay.
In order to support cell radii of different sizes, various length configuration options of special subframes are provided in the TD-LTE system, that is, the lengths of 3 special timeslots are flexibly configurable, as shown in table 1, and are configuration formats of special subframes; for example, under a normal CP (Cyclic Prefix), the special subframe corresponding to the shortest GP length is configured as DwPTS: GP: UpPTS 11: 1: 2 or DwPTS: GP: UpPTS 12: 1; the special subframe configuration corresponding to the longest GP length is DwPTS: GP: UpPTS ═ 3: 10: 1.
TABLE 1
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
in the initial application stage of the TD-LTE system, hot spot coverage is mainly considered in network deployment, and the far-end interference phenomenon is not prominent, so that a far-end interference detection method after TD-LTE networking is not provided in the prior art.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for detecting far-end interference, which are used for detecting the far-end interference.
In order to achieve the above object, an embodiment of the present invention provides a method for detecting far-end interference, including:
the base station equipment obtains a receiving signal of a far-end interference measurement subframe;
and the base station equipment detects the received signal and determines that the far-end interference exists or does not exist according to the detection result.
An embodiment of the present invention provides a base station device, including:
the acquisition module is used for acquiring a receiving signal of a far-end interference measurement subframe;
and the processing module is used for detecting the received signal and determining that the far-end interference exists or does not exist according to the detection result.
Compared with the prior art, the embodiment of the invention at least has the following advantages: according to the characteristic that the signal power can form tailing when a far-end interference signal reaches the cell, the base station equipment can detect the far-end interference condition by judging whether the power of a received signal at a specified measurement position has tailing, so that the real-time monitoring of the far-end interference is realized, once the far-end interference is found, the alarm can be given in time, and a measurement basis is provided for network optimization personnel to take corresponding far-end interference solution measures.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of a TD-LTE remote interference scenario in the prior art;
fig. 2 is a schematic diagram of a TDD frame structure using TYPE2 in a TD-LTE system in the prior art;
fig. 3 is a flowchart illustrating a method for detecting far-end interference according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a process of determining, by the base station device, whether there is a tail of far-end interference in the UpPTS of the received signal and determining, by the base station device, whether there is far-end interference continuously in the UpPTS of the received signal according to the first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station device according to a second embodiment of the present invention.
Detailed Description
The inventor notices in the process of implementing the invention that: under the condition of same-frequency networking, the existence of same-frequency interference among a plurality of cells is the inherent characteristic of a TDD system; the inter-cell co-channel interference of the TD-LTE system can be divided into: close range co-frequency interference and remote co-frequency interference. The close range co-channel interference is as follows: the uplink/downlink interference of two or more nearby cells due to the use of the same time-frequency resource includes: uplink interference of an interfering cell terminal to a interfered cell base station and downlink interference of the interfering cell base station to the interfered cell terminal; since such co-channel interference occurs between cells that are closely spaced, it is called close-range co-channel interference (near-end interference). The remote same-frequency interference is as follows: interference between base stations, specifically interference of a conventional downlink subframe and a DwPTS of a long-distance interference base station on a UpPTS and a conventional uplink subframe of a disturbed base station; in this case, since the interfering base station and the victim base station are generally far apart from each other in terms of distance, such co-channel interference between the base stations is called long-range co-channel interference (far-end interference).
Because there is no method for detecting far-end interference in the prior art, embodiments of the present invention provide a method and an apparatus for detecting far-end interference to implement a function of monitoring far-end interference, so that when it is determined that far-end interference exists, further measurement is performed on an interference signal, and a corresponding far-end interference solution is taken.
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
According to the analysis of the cause and the characteristics of the far-end interference, the far-end interference signal is formed by superposing downlink signals of a cluster of base stations beyond a certain distance, and the distances between each cell in a cell cluster and the cell are different, so that the transmission time delay of the interference signal reaching the cell is different; at the starting position of receiving the measurement signal, downlink signals exist in the DwPTS of each cell in the far-end interference cell cluster, so that a section of signal power with larger power and more flat performance exists; and as time goes on, the downlink signal in the DwPTS of each cell in the cell cluster is sent, the number of interference cells reaching the cell decreases, the power of the interference signal gradually decreases, a tail is formed, and finally the interference is submerged in noise and adjacent cell interference. Intuitively understand that, the inflection point of the signal power, that is, the position where the tail starts, is the position where the DwPTS signal of the interfering cell closest to the cell ends, and the position where the tail ends is the position where the DwPTS signal of the interfering cell farthest from the cell ends, but the position where the tail ends is often submerged in noise and interference of an adjacent cell, and is not easy to observe.
Based on the above analysis, an application scenario of the method provided in the embodiments of the present invention may be a TD-LTE system, that is, whether remote interference exists in a TD-LTE network is detected; as shown in fig. 3, the method for detecting far-end interference includes the following steps:
In the embodiment of the invention, the far-end interference mainly comprises the interference of a conventional downlink subframe and a DwPTS of an interfering base station on a UpPTS and a conventional uplink subframe of a disturbed base station, so the measurement positions of the far-end interference are GP, the UpPTS and the conventional uplink subframe of a special subframe, and a measurement object is a received signal which does not contain an uplink channel of the cell; the related subframe for measuring the far-end interference is a far-end interference measurement subframe.
Specifically, the obtaining, by the base station device, a received signal of the remote interference measurement subframe includes: base station equipment obtains time domain receiving signal in far-end interference measurement sub-frame
Wherein, KaRNumber of receiving antennas, N, of base station equipment representing target cellTSAnd the number of the sampling points of the received signals in the sections of the protection time slot GP and the uplink pilot time slot UpPTS is shown.
Specifically, the detecting, by the base station device, the received signal, and determining the existence or non-existence of the far-end interference according to the detection result includes: the base station device determines that the far-end interference exists or does not exist according to whether the tailing of the far-end interference exists in the UpPTS of the received signal or not and whether the far-end interference continuously exists in the UpPTS of the received signal or not.
Further, the determining, by the base station device, whether the far-end interference exists or not according to whether a tail of the far-end interference exists in the UpPTS of the received signal and whether the far-end interference continuously exists in the UpPTS of the received signal includes: the base station equipment judges whether the tailing of the far-end interference exists in the UpPTS of the received signal; if the tailing of the far-end interference exists, the base station equipment determines that the far-end interference exists in the UpPTS of the received signal; if the tail of the far-end interference does not exist, the base station equipment judges whether the far-end interference continuously exists in the UpPTS of the received signal; if the far-end interference exists continuously, the base station equipment determines that the far-end interference exists in the UpPTS of the received signal and the subsequent conventional subframe; if the far-end interference does not exist continuously, the base station equipment determines that the far-end interference does not exist.
With reference to the processing flow shown in fig. 4, the following further describes that the base station device determines whether there is a tail of the far-end interference in the UpPTS of the received signal, and that the base station device determines whether there is the far-end interference in the UpPTS of the received signal continuously.
In step 401, the base station device calculates the instantaneous power of the received signal, i.e. averages the signal power on each antenna.
Specifically, the base station device calculates the instantaneous power of the received signal, and includes: the base station apparatus calculates the instantaneous power of the received signal by the following formula:
wherein, p (n)TS) Representing the instantaneous power of the received signal.
In this embodiment of the present invention, the calculating, by the base station device, the instantaneous power of the received signal further includes: the base station apparatus low-pass filters the received signal and calculates an instantaneous power of the low-pass filtered received signal.
In the process of low-pass filtering a received signal by base station equipment, in the embodiment of the present invention, when an UpPTS or a conventional uplink subframe is used as a far-end interference measurement subframe, the base station equipment may control that an SRS, a PUCCH, a PUSCH, or the like is not scheduled in the subframes, but if a PRACH (Packet random access Channel) Channel is configured in the subframes, the base station equipment cannot control that a UE (user equipment) does not initiate random access in the subframes, so that the received signal of the interference measurement subframe needs to be low-pass filtered before interference measurement to filter out a resource location occupied by the PRACH.
Specifically, assume that the low-pass filter time-domain impulse response is hl，l＝0，1，...LLF(ii) a The base station apparatus low-pass filters the received signal, including: the base station apparatus low-pass filters the received signal by the following formula (i.e., the filtering process can be expressed as the following formula):
wherein,
representing the low-pass filtered received signal, KaRIndicating the number of receiving antennas of the base station apparatus, NTSIndicating the number of received signal samples in the GP and UpPTS segments.
In the process of calculating the instantaneous power of the low-pass filtered received signal by the base station apparatus, the base station apparatus calculates the instantaneous power of the low-pass filtered received signal, including: the base station apparatus calculates the instantaneous power of the low-pass filtered received signal by the following formula:
wherein, p (n)TS) Representing the instantaneous power of the low-pass filtered received signal.
In step 402, the base station apparatus differentiates the instantaneous power of the received signal.
Specifically, the base station device performs a differential operation on the instantaneous power of the received signal, including: the base station apparatus differentiates the instantaneous power of the received signal by the following formula:
pdiff(nTS)＝p(nTS)/p(nTS+Windiff)
nTS＝0，·，NTS-Winp-Windiff-1
wherein p isdiff(nTS) Representing power difference value, WindiffIs the power difference window length.
In this embodiment of the present invention, the differentiating, by the base station device, the instantaneous power of the received signal further includes: the base station apparatus smoothes the instantaneous power of the received signal and performs a difference operation on the smoothed power of the smoothed received signal.
In the process of smoothing the instantaneous power of the received signal by the base station device, specifically, Win is assumedpThe length of a smoothing window is represented, the average value of various sample value points is calculated in each window to be used as the smoothing value of the instantaneous power of the signal, the smoothing window slides one by one according to the sampling points, and then the base station equipment carries out smoothing processing on the instantaneous power of the received signal, and the smoothing processing method comprises the following steps: the base station apparatus smoothes the instantaneous power of the received signal by the following formula (i.e., the process of smoothing can be expressed as the following formula):
wherein p iswin(nTS) Indicating the smoothed power of the smoothed received signal.
In the process that the base station equipment performs difference operation on the smoothed power of the received signal, specifically, a certain number of sampling points are spaced, and the ratio of the linear values of the smoothed power is calculated, namely, the smoothed power is subjected to difference; suppose WindiffIf the power difference window is long, the base station device performs a difference operation on the smoothed power of the smoothed received signal, including: the base station device performs a difference operation on the smoothed power of the smoothed received signal by the following formula:
pdiff(nTS)＝pwin(nTS)/pwin(nTS+Windiff)
nTS＝0，·，NTS-Winp-Windiff-1
wherein p isdiff(nTS) Indicating the smoothed power difference value.
It should be noted that the purpose of differentiating the smoothed signal power by the base station device is to find an inflection point where the received signal power starts to decrease according to the position where the peak of the differential value is located, so as to determine the start position of the signal power tail.
In step 403, the base station apparatus searches for a peak value of the difference value of power (such as the smoothed power or the instantaneous power described above) and a position where the peak value is located.
Specifically, the searching, by the base station device, for the peak value of the power difference value and the position of the peak value includes: the base station equipment searches the peak value of the power difference value and the position of the peak value through the following formula:
wherein,peak value, max, representing power difference valueposIndicating the location where the peak of the power differential value is located.
In step 404, the base station device calculates an average value of the valley bottom flat portions of the power difference values. The base station device may calculate an average value of the valley bottom flat portion of the power difference value by the peak value of the power difference value and a position where the peak value is located.
Specifically, a part of sampling points at the bottom of the power difference value valley can be selected to calculate the average value of the bottom of the power difference value valley; in order to ensure that the part with relatively flat valley bottom of the power difference value is selected and enough sampling points can be selected, the position max of the peak value of the power difference value needs to be determinedposThe position of the window is adjusted, and I represents the position max of the peak value according to the power difference valueposAdjusting the position of the window; based on this, the base station device calculates the mean value of the valley bottom flat part of the power difference value by the peak value of the power difference value and the position where the peak value is located, and the method includes: the base station device calculates the mean value of the flat part of the power difference value valley by the following formula:
wherein,
representing the mean of the flat part of the power difference value valley.
In step 405, the base station apparatus calculates an average value of the end portion of the instantaneous power value. The base station device may calculate an average value of the end portion of the instantaneous power value by the peak value of the power difference value and a position where the peak value is located.
Specifically, the step of calculating, by the base station device, the average value of the end portion of the instantaneous power value by using the peak value of the power difference value and the position where the peak value is located includes: the base station apparatus calculates an average value of the end portion of the instantaneous power value by the following formula:
wherein, PlowRepresenting the average of the end of the instantaneous power value.
In step 406, the base station apparatus determines whether there is far-end interference. The base station equipment can judge whether the tailing of the far-end interference exists in the UpPTS of the received signal or not through the mean value of the valley bottom flat part of the power difference value; and the base station equipment can judge whether the remote interference exists continuously in the UpPTS of the received signal through the average value of the tail part of the instantaneous power value.
Specifically, the base station device determines whether there is a tail of the far-end interference in the UpPTS of the received signal according to an average value of a valley bottom flat portion of the power difference value, including: when the ratio between the peak of the power difference value and the mean of the valley bottom flat portion:
if so, the base station equipment judges that the tailing of the far-end interference exists in the UpPTS of the received signal; otherwise, judging that the tailing of the far-end interference does not exist in the UpPTS of the received signal;
wherein,
indicating a set threshold.
The base station equipment judges whether the remote interference exists continuously in the UpPTS of the received signal according to the average value of the tail part of the instantaneous power value, and the method comprises the following steps: mean value P when the end of the instantaneous power valuelowGreater (much greater) than the base noise P of the base station equipmentNAnd if so, the base station equipment judges that the remote interference continuously exists in the UpPTS of the received signal, otherwise, the remote interference does not continuously exist.
In the embodiment of the invention, base station equipment firstly calculates the ratio of the peak value of the power difference value to the mean value of the valley bottom flat part, and compares the ratio with a set threshold to judge whether the UpPTS has far-end interference; if the ratio is greater than or equal to a set threshold, the far-end interference is considered to exist; if the ratio is smaller than the set threshold, the relative size of the average value of the tail part of the instantaneous power value and the background noise at the base station equipment side needs to be further judged; if the average value of the tail part of the instantaneous power value is obviously larger than the bottom noise of the base station equipment side, the far-end interference is considered to exist and continues to the conventional uplink subframe; otherwise there is no interference.
In particular, when
If so, judging that the received signal power has trailing in the UpPTS section, namely, the received signal power has far-end interference;
when in use
And P islow＞＞PNIf so, judging that the received signal power continuously has far-end interference in the UpPTS segment, and the far-end interference tailing falls in a subsequent conventional uplink subframe;
when in use
And P islow≈PNIf so, then determine that there is not farEnd interference.
In summary, in the embodiments of the present invention, according to the characteristic that the signal power will form a tail when the far-end interference signal reaches the local cell, the base station device may detect the far-end interference condition by determining whether the tail exists in the power of the received signal at the specified measurement location, thereby implementing a real-time monitoring function for the far-end interference, and once the far-end interference is found, the base station device may alarm in time, further measure the interference signal, and provide a measurement basis for the network optimization staff to take a corresponding far-end interference solution.
Example two
Based on the same inventive concept as the above method, an embodiment of the present invention further provides a base station apparatus, as shown in fig. 5, where the base station apparatus includes:
an obtaining module 11, configured to obtain a received signal of a far-end interference measurement subframe;
and the processing module 12 is configured to detect the received signal, and determine that far-end interference exists or does not exist according to a detection result.
The obtaining module 11 is specifically configured to obtain a time domain receiving signal in the far-end interference measurement subframe <math>
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Wherein, KaRRepresenting the number of receiving antennas, N, of the base station apparatusTSAnd the number of the sampling points of the received signals in the sections of the protection time slot GP and the uplink pilot time slot UpPTS is shown.
The far-end interference measurement subframe comprises: special subframe GP, special subframe UpPTS, and normal uplink subframe.
The processing module 12 is specifically configured to determine that far-end interference exists or does not exist according to whether a tail of the far-end interference exists in the UpPTS of the received signal or not and whether the far-end interference continuously exists in the UpPTS of the received signal or not.
The processing module 12 comprises:
a determining submodule 121, configured to determine whether a far-end interference tail exists in the UpPTS of the received signal; and when the tail of the far-end interference does not exist, judging whether the far-end interference continuously exists in the UpPTS of the received signal;
a processing submodule 122, configured to determine that far-end interference exists in the UpPTS of the received signal when a tail of the far-end interference exists; and when the far-end interference exists continuously, determining that the far-end interference exists in the UpPTS of the received signal and a subsequent conventional subframe; when the far-end interference does not exist continuously, determining that the far-end interference does not exist.
The determining submodule 121 is specifically configured to calculate an instantaneous power of the received signal, and perform a differential operation on the instantaneous power of the received signal;
searching a peak value of the power difference value and a position of the peak value;
calculating the mean value of the valley bottom flat part of the power difference value according to the peak value of the power difference value and the position of the peak value;
and judging whether the tail of the far-end interference exists in the UpPTS of the received signal or not according to the average value of the valley bottom flat part of the power difference value.
The determining submodule 121 is specifically configured to calculate an instantaneous power of the received signal, and perform a differential operation on the instantaneous power of the received signal;
searching a peak value of the power difference value and a position of the peak value;
calculating the average value of the tail part of the instantaneous power value according to the peak value of the power difference value and the position of the peak value;
and judging whether the remote interference exists continuously in the UpPTS of the received signal or not according to the average value of the tail part of the instantaneous power value.
The determining submodule 121 is further configured to calculate the instantaneous power of the received signal by the following formula:
wherein, p (n)TS) Representing the instantaneous power of the received signal.
The determining submodule 121 is further configured to perform a difference operation on the instantaneous power of the received signal by the following formula:
pdiff(nTS)＝p(nTS)/p(nTS+Windiff)
nTS＝0，·，NTS-Winp-Windiff-1
wherein p isdiff(nTS) Representing power difference value, WindiffIs the power difference window length.
The determining submodule 121 is further configured to search for a peak value of the power difference value and a position where the peak value is located by the following formula:
wherein,
peak value, max, representing power difference valueposIndicating the location where the peak of the power differential value is located.
The determining submodule 121 is further configured to calculate an average value of the power difference value valley bottom flat portion by the following formula:
wherein,
represents the mean value of the flat part of the bottom of the power difference value valley, I represents the position max of the peak value according to the power difference valueposAnd adjusting the position of the window.
The determining submodule 121 is further configured to, when a ratio between a peak value of the power difference value and a mean value of the valley bottom flat portion:
if so, judging that a far-end interference trailing exists in the UpPTS of the received signal; otherwise, judging that the tailing of the far-end interference does not exist in the UpPTS of the received signal;
wherein,indicating a set threshold.
The determining submodule 121 is further configured to calculate an average value of the end portion of the instantaneous power value by the following formula:
wherein, PlowRepresenting the average of the end of the instantaneous power value.
The determining submodule 121 is further configured to determine the mean value P of the end portion of the instantaneous power valuelowGreater than base station device bottom noise PNIf so, judging that the remote interference continuously exists in the UpPTS of the received signal, otherwise, not continuously existing the remote interference.
The determining submodule 121 is further configured to perform low-pass filtering on the received signal, and calculate instantaneous power of the low-pass filtered received signal.
The determining sub-module 121 is further configured to perform low-pass filtering on the received signal according to the following formula:
wherein,
representing the low-pass filtered received signal, KaRRepresenting the number of receiving antennas, N, of the base station apparatusTSThe number of sampling points of the received signals in GP and UpPTS sections is shown, and the time domain impulse response of the low-pass filter is hl，l＝0，1，...LLF。
The determining sub-module 121 is further configured to calculate an instantaneous power of the low-pass filtered received signal according to the following formula:
wherein, p (n)TS) Representing the instantaneous power of the low-pass filtered received signal.
The determining submodule 121 is further configured to smooth the instantaneous power of the received signal, and perform a difference operation on the smoothed power of the received signal.
The determining submodule 121 is further configured to smooth the instantaneous power of the received signal according to the following formula:
wherein p iswin(nTS) Represents the smoothed power, Win, of the smoothed received signalpRepresenting the smoothing window length.
The determining submodule 121 is further configured to perform a difference operation on the smoothed power of the smoothed receiving signal according to the following formula:
pdiff(nTS)＝pwin(nTS)/pwin(nTS+Windiff)
nTS＝0，·，NTS-Winp-Windiff-1
wherein p isdiff(nTS) Representing the smoothed power difference value, WindiffIs the power difference window length.
The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (40)
1. A method for detecting far-end interference, comprising:
the base station equipment obtains a receiving signal of a far-end interference measurement subframe;
and the base station equipment detects the received signal and determines that the far-end interference exists or does not exist according to the detection result.
2. The method of claim 1, wherein the base station device obtaining the received signal of a remote interference measurement subframe comprises:
the base station equipment obtains the time domain receiving signal in the far-end interference measurement sub-frame
Wherein, KaRRepresenting the number of receiving antennas, N, of the base station apparatusTSAnd the number of the sampling points of the received signals in the sections of the protection time slot GP and the uplink pilot time slot UpPTS is shown.
3. The method of claim 1 or 2, wherein the far-end interference measurement subframe comprises: special subframe GP, special subframe UpPTS, and normal uplink subframe.
4. The method of claim 1, wherein the base station device detecting the received signal and determining the presence or absence of far-end interference according to the detection result comprises:
and the base station equipment determines that the far-end interference exists or does not exist according to whether the tailing of the far-end interference exists in the UpPTS of the received signal or not and whether the far-end interference continuously exists in the UpPTS of the received signal or not.
5. The method of claim 4, wherein the base station device determining the presence or absence of far-end interference based on whether a tail of far-end interference is present within the UpPTS of the received signal and whether far-end interference is continuously present within the UpPTS of the received signal comprises:
the base station equipment judges whether the tailing of the far-end interference exists in the UpPTS of the received signal;
if the tailing of the far-end interference exists, the base station equipment determines that the far-end interference exists in the UpPTS of the received signal;
if the tail of the far-end interference does not exist, the base station equipment judges whether the far-end interference continuously exists in the UpPTS of the received signal;
if the far-end interference exists continuously, the base station equipment determines that the far-end interference exists in the UpPTS and the subsequent conventional subframe of the received signal;
and if the far-end interference does not exist continuously, the base station equipment determines that the far-end interference does not exist.
6. The method of claim 5, wherein the base station device determines whether a far-end interference tail is present within the UpPTS of the received signal, further comprising:
the base station device calculates the instantaneous power of the received signal and performs a differential operation on the instantaneous power of the received signal;
the base station equipment searches the peak value of the power difference value and the position of the peak value;
the base station equipment calculates the mean value of the valley bottom flat part of the power difference value according to the peak value of the power difference value and the position of the peak value;
and the base station equipment judges whether the tailing of the far-end interference exists in the UpPTS of the received signal or not according to the mean value of the valley bottom flat part of the power difference value.
7. The method of claim 5, wherein the base station device determines whether far-end interference persists within the UpPTS of the received signal, further comprising:
the base station device calculates the instantaneous power of the received signal and performs a differential operation on the instantaneous power of the received signal;
the base station equipment searches the peak value of the power difference value and the position of the peak value;
the base station equipment calculates the average value of the tail part of the instantaneous power value according to the peak value of the power difference value and the position of the peak value;
and the base station equipment judges whether the remote interference exists continuously in the UpPTS of the received signal or not according to the average value of the tail part of the instant power value.
8. The method of claim 6 or 7, wherein the base station device calculates the instantaneous power of the received signal, comprising:
the base station apparatus calculates the instantaneous power of the received signal by the following formula:
wherein, p (n)TS) Representing the instantaneous power of the received signal.
9. The method of claim 8, wherein the base station device differentially operates on instantaneous power of received signals, comprising:
the base station apparatus differentiates instantaneous power of a received signal by the following formula:
pdiff(nTS)＝p(nTS)/p(nTS+Windiff)
nTS＝0，·，NTS-Winp-Windiff-1
wherein p isdiff(nTS) Representing power difference value, WindiffIs the power difference window length.
10. The method of claim 9, wherein the base station device searches for a peak value of the power difference value and a position where the peak value is located, comprising:
the base station equipment searches the peak value of the power difference value and the position of the peak value through the following formula:
wherein,
peak value, max, representing power difference valueposIndicating the location where the peak of the power differential value is located.
11. The method of claim 10, wherein the base station device calculates an average value of a valley flat portion of the power difference value by a peak value of the power difference value and a position where the peak value is located, including:
the base station device calculates an average value of a valley bottom flat portion of the power difference value by the following formula:
wherein,
represents the mean value of the flat part of the bottom of the power difference value valley, I represents the position max of the peak value according to the power difference valueposAnd adjusting the position of the window.
12. The method of claim 11, wherein the base station device determining whether a tail of far-end interference is present within the UpPTS of the received signal by an average of a valley flat portion of power difference values comprises:
when the ratio between the peak value of the power difference value and the mean value of the valley bottom flat portion:
if so, the base station equipment judges that the tailing of the far-end interference exists in the UpPTS of the received signal; otherwise, judging that the tailing of the far-end interference does not exist in the UpPTS of the received signal;
wherein,
indicating a set threshold.
13. The method as claimed in claim 10, wherein said base station device calculates an average value of an end portion of an instantaneous power value by a peak value of said power difference value and a position where the peak value is located, comprising:
the base station device calculates the average value of the end part of the instantaneous power value by the following formula:
wherein, PlowRepresenting the average of the end of the instantaneous power value.
14. The method of claim 13, wherein the base station device determines whether far-end interference persists in the UpPTS of the received signal by an average of an end portion of an instantaneous power value, comprising:
mean value P when the end of the instantaneous power valuelowGreater than base station device bottom noise PNAnd if so, the base station equipment judges that the remote interference continuously exists in the UpPTS of the received signal, otherwise, the remote interference does not continuously exist.
15. The method of claim 6 or 7, wherein the base station device calculates the instantaneous power of the received signal, comprising:
the base station device low-pass filters the received signal and calculates the instantaneous power of the low-pass filtered received signal.
16. The method of claim 15, wherein the base station device low pass filtering the received signal comprises:
the base station device low-pass filters the received signal by the following formula:
wherein,
representing the low-pass filtered received signal, KaRRepresenting the number of receiving antennas, N, of the base station apparatusTSIndicating reception within GP and UpPTS segmentsThe number of signal sampling points and the time domain impulse response of the low-pass filter are hl，l＝0，1，...LLF。
17. The method of claim 16, wherein the base station device calculating the instantaneous power of the low-pass filtered received signal comprises:
the base station device calculates the instantaneous power of the low-pass filtered received signal by the following formula:
wherein, p (n)TS) Representing the instantaneous power of the low-pass filtered received signal.
18. The method of claim 6 or 7, wherein the base station device differentially operates on the instantaneous power of the received signal, comprising:
the base station device smoothes the instantaneous power of the received signal and performs a difference operation on the smoothed power of the smoothed received signal.
19. The method of claim 18, wherein smoothing the instantaneous power of the received signal by the base station device comprises:
the base station device smoothes the instantaneous power of the received signal by the following formula:
wherein p iswin(nTS) Representing the smoothed received signalSmoothing power, WinpRepresenting the smoothing window length.
20. The method of claim 19, wherein the base station device differentiating the smoothed power of the smoothed received signal comprises:
the base station device performs difference operation on the smoothed power of the smoothed receiving signal through the following formula:
pdiff(nTS)＝pwin(nTS)/pwin(nTS+Windiff)
nTS＝0，·，NTS-Winp-Windiff-1
wherein p isdiff(nTS) Representing the smoothed power difference value, WindiffIs the power difference window length.
21. A base station apparatus, comprising:
the acquisition module is used for acquiring a receiving signal of a far-end interference measurement subframe;
and the processing module is used for detecting the received signal and determining that the far-end interference exists or does not exist according to the detection result.
22. The base station apparatus of claim 21,
the obtaining module is specifically configured to obtain a time domain received signal in the far-end interference measurement subframe
Wherein, KaRRepresenting the number of receiving antennas, N, of the base station apparatusTSAnd the number of the sampling points of the received signals in the sections of the protection time slot GP and the uplink pilot time slot UpPTS is shown.
23. The base station apparatus of claim 21 or 22, wherein the remote interference measurement subframe comprises: special subframe GP, special subframe UpPTS, and normal uplink subframe.
24. The base station apparatus of claim 21,
the processing module is specifically configured to determine that far-end interference exists or does not exist according to whether a tail of the far-end interference exists in the UpPTS of the received signal or not and whether the far-end interference continuously exists in the UpPTS of the received signal or not.
25. The base station device of claim 24, wherein the processing module comprises:
the judging submodule is used for judging whether the trailing of the far-end interference exists in the UpPTS of the received signal; and when the tail of the far-end interference does not exist, judging whether the far-end interference continuously exists in the UpPTS of the received signal;
the processing submodule is used for determining that the far-end interference exists in the UpPTS of the received signal when the tailing of the far-end interference exists; and when the far-end interference exists continuously, determining that the far-end interference exists in the UpPTS of the received signal and a subsequent conventional subframe; when the far-end interference does not exist continuously, determining that the far-end interference does not exist.
26. The base station apparatus of claim 25,
the judgment submodule is specifically used for calculating the instantaneous power of the received signal and carrying out differential operation on the instantaneous power of the received signal;
searching a peak value of the power difference value and a position of the peak value;
calculating the mean value of the valley bottom flat part of the power difference value according to the peak value of the power difference value and the position of the peak value;
and judging whether the tail of the far-end interference exists in the UpPTS of the received signal or not according to the average value of the valley bottom flat part of the power difference value.
27. The base station apparatus of claim 25,
the judgment submodule is specifically used for calculating the instantaneous power of the received signal and carrying out differential operation on the instantaneous power of the received signal;
searching a peak value of the power difference value and a position of the peak value;
calculating the average value of the tail part of the instantaneous power value according to the peak value of the power difference value and the position of the peak value;
and judging whether the remote interference exists continuously in the UpPTS of the received signal or not according to the average value of the tail part of the instantaneous power value.
28. The base station apparatus of claim 26 or 27,
the judgment sub-module is further used for calculating the instantaneous power of the received signal according to the following formula:
wherein, p (n)TS) Representing the instantaneous power of the received signal.
29. The base station apparatus of claim 28,
the judgment sub-module is further used for carrying out differential operation on the instantaneous power of the received signal through the following formula:
pdiff(nTS)＝p(nTS)/p(nTS+Windiff)
nTS＝0，·，NTS-Winp-Windiff-1
wherein p isdiff(nTS) Representing power difference value, WindiffIs the power difference window length.
30. The base station apparatus of claim 29,
the judgment submodule is further used for searching the peak value of the power difference value and the position of the peak value through the following formula:
wherein,
peak value, max, representing power difference valueposIndicating the location where the peak of the power differential value is located.
31. The base station apparatus of claim 30,
the judgment submodule is further used for calculating the mean value of the power difference value valley bottom flat part through the following formula:
wherein,
represents the mean value of the flat part of the bottom of the power difference value valley, I represents the position max of the peak value according to the power difference valueposAnd adjusting the position of the window.
32. The base station apparatus of claim 31,
the judgment submodule is further configured to, when a ratio between a peak value of the power difference value and a mean value of the valley bottom flat portion:
if so, judging that a far-end interference trailing exists in the UpPTS of the received signal; otherwise, judging that the tailing of the far-end interference does not exist in the UpPTS of the received signal;
wherein,indicating a set threshold.
33. The base station apparatus of claim 30,
the judgment submodule is further used for calculating the average value of the tail part of the instantaneous power value through the following formula:
wherein, PlowRepresenting the average of the end of the instantaneous power value.
34. The base station apparatus of claim 33,
the judgment submodule is further used for judging the mean value P of the tail part of the instant power valuelowGreater than base station device bottom noise PNIf so, judging that the remote interference continuously exists in the UpPTS of the received signal, otherwise, not continuously existing the remote interference.
35. The base station apparatus of claim 26 or 27,
the judgment submodule is further configured to perform low-pass filtering on the received signal, and calculate instantaneous power of the received signal after the low-pass filtering.
36. The base station apparatus of claim 35,
the determining sub-module is further configured to perform low-pass filtering on the received signal according to the following formula:
wherein,
representing the low-pass filtered received signal, KaRRepresenting the number of receiving antennas, N, of the base station apparatusTSThe number of sampling points of the received signals in GP and UpPTS sections is shown, and the time domain impulse response of the low-pass filter is hl，l＝0，1，...LLF。
37. The base station apparatus of claim 36,
the judgment sub-module is further configured to calculate the instantaneous power of the low-pass filtered received signal by the following formula:
wherein, p (n)TS) Representing the instantaneous power of the low-pass filtered received signal.
38. The base station apparatus of claim 26 or 27,
the judgment submodule is further used for smoothing the instantaneous power of the received signal and carrying out difference operation on the smoothed smooth power of the received signal.
39. The base station apparatus of claim 38,
the judgment submodule is further used for smoothing the instantaneous power of the received signal through the following formula:
wherein p iswin(nTS) Represents the smoothed power, Win, of the smoothed received signalpRepresenting the smoothing window length.
40. The base station apparatus of claim 39,
the judgment submodule is further configured to perform a difference operation on the smoothed power of the smoothed received signal according to the following formula:
pdiff(nTS)＝pwin(nTS)/pwin(nTS+Windiff)
nTS＝0，·，NTS-Winp-Windiff-1
wherein p isdiff(nTS) Representing the smoothed power difference value, WindiffIs the power difference window length.
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210602 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |