WO2017211212A1

WO2017211212A1 - Method and device for positioning interference source cell, and base station

Info

Publication number: WO2017211212A1
Application number: PCT/CN2017/086397
Authority: WO
Inventors: 曾召华; 王雯芳
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-06-06
Filing date: 2017-05-27
Publication date: 2017-12-14
Also published as: CN107466054A

Abstract

Provided are a method and device for positioning an interference source cell, and a base station. The method comprises: acquiring an interference signal interfering with a current cell; determining, according to the interference signal, a cell reference signal (CRS) sequence of the interference source cell transmitting the interference signal; and determining the interference source cell according to the CRS sequence. By means of the present disclosure, the problem in the relevant art where an interference source cannot be positioned accurately is solved, and the effects of accurately positioning the interference source and further effectively eliminating the interference are achieved.

Description

Positioning method, device and base station of interference source cell

Technical field

The present disclosure relates to the field of communications, and in particular, to a method, an apparatus, and a base station for positioning an interference source cell.

Background technique

For the Time Division-Long Term Evolution (TD-LTE) system, the base station is required to maintain strict time synchronization. Generally, the global positioning system (GPS) is used to ensure synchronization. Time synchronization between base stations. However, in the TD-LTE system, the network is deployed in the same frequency coverage manner, which may cause mutual interference between neighboring cells. Due to the uplink and downlink transmission sharing frequency of the TD-LTE system, in addition to the traditional inter-cell interference in the TD-LTE system, the downlink signal of the remote base station interferes with the target cell (corresponding to the current cell described below). Signal problem.

Due to the propagation characteristics of electromagnetic waves, in some scenarios (good air propagation environment, atmospheric waveguide effect, etc.), long-distance co-channel interference of TD-LTE systems may occur between base stations that are far apart (eg, several tens of kilometers apart) Even hundreds of kilometers), and the downlink signal of the remote source passes through the propagation delay to reach the target base station of the near-end same frequency, and may enter other transmission time slots of the target base station, thereby affecting the normal operation of the near-end target system, and this Interference may be the effect of cumulative superposition of multiple base stations, as shown in Figure 1.

In practical applications, when the cell of the base station (corresponding to the current cell described below) is interfered by the signals of other cells, it is necessary to analyze the source of the interference signal, that is, determine the cell to which the interference signal belongs, thereby preparing for the interference cancellation. If the cell of a certain base station cannot work normally due to interference of other cells, and cannot quickly locate the source of the interference signal, it is difficult to eliminate the interference signal, and the victim cell cannot be quickly restored to the normal working state.

Moreover, in the early stage of the application of the TD-LTE system, the focus of the deployment is hotspot coverage, and the far-end interference phenomenon is not very prominent. Therefore, the related technology is the remote end of the TD-LTE network. The interference detection method involves less, and since the interference between the above base stations has a multi-station cumulative superposition and a wide range, it is difficult to accurately locate the interference source in the related art.

In view of the above problems existing in the related art, an effective solution has not yet been proposed.

Public content

The embodiments of the present disclosure provide a method, a device, and a base station for locating an interference source cell, so as to at least solve the problem that the related information cannot be accurately located.

According to an embodiment of the present disclosure, a method for locating an interference source cell is provided, including: acquiring an interference signal that interferes with a current cell; and determining, according to the interference signal, a cell reference signal of an interference source cell that sends the interference signal. a CRS sequence; determining the interferer cell according to the CRS sequence.

Optionally, the acquiring the interference signal that interferes with the current cell includes at least one of: acquiring the interference signal in an uplink time slot of a base station to which the current cell belongs; The interference signal is acquired in a downlink time slot.

Optionally, the acquiring the interference signal in the uplink time slot of the base station to which the current cell belongs includes: when the current cell is in an idle state, in the uplink time slot of the base station Obtaining the interference signal; and/or acquiring the interference signal in the downlink time slot of the base station to which the current cell belongs includes: after placing the downlink time slot in a silent state, in the The interference signal is acquired in the downlink time slot of the base station.

Optionally, determining, according to the interference signal, the CRS sequence of the interference source cell that sends the interference signal comprises: performing time domain to frequency domain transformation on the interference signal to obtain a frequency domain interference signal; The frequency domain interference signal determines a symbol in which the CRS sequence is located; the CRS sequence is determined according to a symbol in which the CRS sequence is located.

Optionally, performing time domain to frequency domain transform on the interference signal comprises: performing time domain symbol synchronization on the interference signal; and performing time domain to frequency domain transform on the interference signal that performs time domain symbol synchronization.

Optionally, determining, according to the symbol in which the CRS sequence is located, the CRS sequence includes: Determining a set of values of the CRS sequence according to a symbol in which the CRS sequence is located; determining an actual value of the CRS sequence by performing traversal matching on values in the set of values of the CRS sequence.

Optionally, determining, by performing traversal matching on the value in the set of values of the CRS sequence, the actual value of the CRS sequence includes: according to the location of the resource block occupied by the CRS sequence in the frequency domain from the Determining a set of values of the CRS sequence in the set of values; determining an actual value of the CRS sequence by performing traversal matching on the values in the subset of values of the CRS sequence.

Optionally, determining, according to the CRS sequence, the interference source cell includes: determining, according to a cell identifier used when the CRS sequence is generated, a cell identifier of the interference source cell; determining, according to a cell identifier of the interference source cell, Interference source cell.

Optionally, determining the interference source cell according to the cell identifier of the interference source cell includes: determining a distance between the interference source cell and the current cell, and/or determining, by the interference source cell, the current The location information of the cell; determining the interference source cell according to the determined distance, the location information, and the cell identity of the interference source cell.

Optionally, determining the distance between the interference source cell and the current cell includes: determining the distance D by using: D=(N _I +N _GP )×T _sym ×3×10 ⁸ , where N _I The number of interference symbols in the uplink time slot of the received signal received by the current cell, the N _GP is the number of symbols corresponding to the system protection interval GP, and T _sym is the total length of the single symbol time domain including the cyclic prefix. .

Optionally, determining the location information of the interference source cell relative to the current cell includes: determining an arrival angle of the interference signal to the current cell; determining, according to the angle of arrival, an interference source cell, relative to the current cell. Bearing information.

According to another embodiment of the present disclosure, a positioning apparatus for an interference source cell is further provided, including: an acquiring module, configured to acquire an interference signal that interferes with a current cell; and a first determining module configured to be according to the interference signal Determining a cell reference signal CRS sequence of the interference source cell that sends the interference signal; and determining, by the second determining module, the interference source cell according to the CRS sequence.

Optionally, the acquiring module acquires, by using at least one of the following manners, the interference signal that interferes with the current cell: acquiring the interference signal in an uplink time slot of a base station to which the current cell belongs; The interference signal is acquired in a downlink time slot of a base station to which the current cell belongs.

Optionally, the first determining module determines, according to the interference signal, the CRS sequence of the interference source cell that sends the interference signal according to the interference signal: performing time domain to frequency domain transformation on the interference signal, Obtaining a frequency domain interference signal; determining, according to the frequency domain interference signal, a symbol in which the CRS sequence is located; determining the CRS sequence according to a symbol in which the CRS sequence is located.

Optionally, the second determining module determines, according to the CRS sequence, the interference source cell by: determining, according to the cell identifier used when the CRS sequence is generated, a cell identifier of the interference source cell; The cell identity of the source cell determines the interference source cell.

According to another embodiment of the present disclosure, there is also provided a base station, comprising the positioning device of the interference source cell according to any one of the above.

According to still another embodiment of the present disclosure, a storage medium is also provided. The storage medium is arranged to store program code for performing the steps in any of the above methods.

According to still another embodiment of the present disclosure, there is also provided an electronic device comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor The method of any of the above is performed by the computer program.

With the embodiment of the present disclosure, the CRS sequence of the interference source cell is determined according to the interference signal, and then the specific interference source cell is determined according to the CRS sequence, thereby realizing the purpose of locating the interference source cell, and solving the related art The problem of accurately locating the interference source cannot be achieved, and the interference source is accurately located, thereby effectively eliminating the interference effect.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the present disclosure, and constitute a part of this application. Improper opening. In the drawing:

1 is a schematic diagram of long-distance co-channel interference in a TD-LTE system;

2 is a block diagram showing a hardware structure of a base station of a method for locating an interference source cell according to an embodiment of the present disclosure;

3 is a flowchart of a method of locating an interference source cell according to an embodiment of the present disclosure;

4 is a flowchart of a method of locating an aggressor cell according to an embodiment of the present disclosure;

5 is a flow chart of a method of interference signal detection in accordance with an embodiment of the present disclosure;

6 is a schematic diagram of a single-port, two-port, and four-port CRS transmission location in a normal cyclic prefix in a TD-LTE system according to an embodiment of the present disclosure;

FIG. 7 is a flowchart of another method for locating an interference source cell according to an embodiment of the present disclosure; FIG.

FIG. 8 is a structural block diagram of a positioning apparatus of an interference source cell according to an embodiment of the present disclosure; FIG.

9 is a schematic diagram of an apparatus for locating an interferer cell according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of another apparatus for locating an interference source cell according to an embodiment of the present disclosure.

detailed description

The present disclosure will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second", and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In an optional embodiment, a base station is provided, and the method embodiment provided in this embodiment of the present application may be performed in a base station. 2 is a block diagram showing a hardware structure of a base station of a method for locating an interference source cell according to an embodiment of the present disclosure. As shown in FIG. 2, base station 20 may include one or more (only one of which is shown in FIG. 2) processor 202 (processor 202 may include, but is not limited to, micro A processing device such as a processor MCU or a programmable logic device FPGA, a memory 204 for storing data, and a transmission device 206 for communication functions. It will be understood by those skilled in the art that the structure shown in FIG. 2 is merely illustrative and does not limit the structure of the above electronic device. For example, base station 20 may also include more or fewer components than those shown in FIG. 2, or have a different configuration than that shown in FIG. 2.

The memory 204 can be used to store software programs and modules of the application software, such as program instructions/modules corresponding to the positioning method of the interference source cell in the embodiment of the present disclosure, and the processor 202 runs the software program and the module stored in the memory 204, thereby The above methods are implemented by performing various functional applications and data processing. Memory 204 can include high speed random access memory and can also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, memory 204 can further include memory remotely located relative to processor 202, which can be connected to base station 20 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof. Transmission device 206 is for receiving or transmitting data.

In an optional embodiment, a method for operating the foregoing base station is provided, and FIG. 3 is a flowchart of a method for locating an interference source cell according to an embodiment of the present disclosure. As shown in FIG. 3, the process includes the following steps. :

Step S302: Acquire an interference signal that interferes with the current cell.

Step S304, determining, according to the interference signal, a cell reference signal (Cell-specific Reference Signals, CRS for short) sequence of the interference source cell that sends the interference signal;

Step S306, determining an interference source cell according to the CRS sequence.

Through the above steps, the CRS sequence of the interference source cell is determined according to the interference signal, and then the specific interference source cell is determined according to the CRS sequence, thereby realizing the purpose of locating the interference source cell, and solving the problem that the related technology cannot accurately locate. The problem of the interference source achieves the accurate positioning of the interference source, thereby effectively eliminating the interference effect.

Optionally, the execution body of the foregoing steps may be a base station, but is not limited thereto.

In an optional embodiment, in the foregoing step S302, acquiring the current cell The interfering interference signal may include at least one of the following: an uplink time slot of the base station to which the current cell belongs (the uplink time slot may include an Uplink Pilot Time Slot (UpPTS) and/or an UpPTS). Obtaining the above-mentioned interference signal in the normal uplink time slot; the downlink time slot of the base station to which the current cell belongs (including Downlink Pilot Time Slot (DwPTS) and/or normal downlink except DwPTS) The above interference signal is acquired in the time slot). In this embodiment, the interference signal may be extracted from the received signal. In the present disclosure, when the base station receives a signal, it may first perform interference measurement on the signal. When the measurement result is to determine that there is interference of other cells, the interference signal is extracted from the received signal, and then according to the extracted The interference signal determines the cell that transmitted the interference signal, that is, the interference source cell.

It can be seen from the foregoing embodiment that when acquiring an interference signal, it may be acquired in an uplink time slot of a base station to which the current cell belongs, or may be acquired in a downlink time slot of a base station to which the current cell belongs. Optionally, when acquiring the interference signal in the uplink time slot of the base station to which the current cell belongs, the interference signal may be acquired in an uplink time slot of the base station when the current cell is in an idle state, thereby avoiding the extraction. The signal of the current cell ensures that the extracted signals are all from the interference source cell, thereby providing a guarantee for determining the interference source cell. Optionally, when the interference signal is obtained in a downlink time slot of the base station to which the current cell belongs, the downlink time slot may be placed in a silent state (some or all of the downlink time slots may be in a silent state), The interference signal is acquired in the downlink time slot of the above base station, so that the extraction range can be expanded.

In an optional embodiment, in the foregoing step S304, determining, according to the interference signal, the CRS sequence of the interference source cell that sends the interference signal may be determined by performing time domain to frequency domain transformation on the interference signal, Obtaining a frequency domain interference signal; determining a symbol of the CRS sequence according to the frequency domain interference signal; and determining a CRS sequence according to the symbol of the CRS sequence.

In an optional embodiment, the transforming the time domain to the frequency domain of the interference signal comprises: performing time domain symbol synchronization on the interference signal; and performing time domain to frequency domain on the interference signal with time domain symbol synchronization. Transform. The time domain symbol synchronization can be performed by using a cyclic prefix (Cyclic Prefix, abbreviated as CP), which is orthogonal frequency division multiplexing (orthogonal). The frequency division multiplexing (referred to as OFDM) symbol tail repetition feature uses a CP of one OFDM symbol to perform correlation detection with the repeated part, and searches for the interference signal from the back to the front, and the peak position is the symbol synchronization position. In order to improve the accuracy, the correlation detection can be performed simultaneously with the CP of the plurality of OFDM symbols and the repeated portion.

In an optional embodiment, in the foregoing step S306, determining the CRS sequence according to the symbol in which the CRS sequence is located includes: determining a value set of the CRS sequence according to a symbol in which the CRS sequence is located; and determining a value of the CRS sequence by using the CRS sequence. The values in the set are traversed and matched to determine the actual value of the above CRS sequence. In this embodiment, when determining the value set of the CRS sequence according to the symbol of the CRS sequence, determining the possible value of the CRS sequence according to the symbol of the CRS sequence, one or more of the determined possible values may exist. The value is the actual value of the CRS sequence. Therefore, after determining the possible values of the CRS sequence, it is necessary to perform traversal matching on the possible values (similar to blind detection), and select one or more values with the highest matching relevance. Or selecting a value whose matching correlation is higher than a certain threshold as a CRS sequence that interferes with an interference signal of the current cell. In this embodiment, the number of symbols in which the CRS sequence is located may be one or plural. The symbol of the detected CRS sequence is independent of whether there is a Physical Downlink Shared Channel (PDSCH) signal, and may be in the DwPTS, or in a normal downlink subframe, or may be simultaneously distributed. Within DwPTS and normal downlink subframes.

In an optional embodiment, determining, by performing traversal matching on the values in the set of values of the CRS sequence, the actual value of the CRS sequence includes: according to the location of the resource block occupied by the CRS sequence in the frequency domain, Determining a subset of values of the CRS sequence in the set of values; determining the actual value of the CRS sequence by performing traversal matching on the values in the subset of values of the CRS sequence. In this embodiment, before the traversal matching is performed on the values of all possible CRS sequences, the number of possible values can be further reduced by the above operation, thereby reducing the time of traversing the matching.

In an optional embodiment, in the foregoing step S306, determining, by using the CRS sequence, the interference source cell includes: determining, according to the cell identifier used when the CRS sequence is generated, the cell identifier of the interference source cell; and according to the cell of the interference source cell The identity identifies the interferer cell. In In this embodiment, after determining the actual value of the CRS sequence, the cell identifier used to generate the CRS sequence may be determined according to the actual value of the CRS sequence, and the cell identifier used to generate the CRS sequence is the foregoing interference source cell. Cell identification.

In an optional embodiment, determining the interference source cell according to the cell identifier of the interference source cell includes: determining a distance between the interference source cell and a current cell, and/or determining an orientation of the interference source cell relative to a current cell. And determining the interference source cell according to the determined distance, the azimuth information, and the cell identifier of the interference source cell. In the actual networking, the cell identifiers of different cells may be the same. Therefore, the specific interference source cell may not be determined according to the cell identifier. In this embodiment, the distance between the interference source cell and the current cell, and the interference are combined. The source cell performs the location of the interference source cell with respect to the orientation information of the current cell, so that the interference source cell can be accurately locked, and the purpose of accurately locating the source of the interference signal is achieved.

In an optional embodiment, determining the distance between the interference source cell and the current cell includes: determining the distance D by using the following formula: D=(N _I + N _GP )×T _sym ×3×10 ⁸ , where N _I is the number of interference symbols in the uplink time slot of the received signal that the interference signal falls in the current cell, N _GP is the number of symbols corresponding to the Guard Period (GP), and T _sym is a single number including the cyclic prefix. The total length of the symbol time domain.

In an optional embodiment, determining the azimuth information of the interference source cell relative to the current cell includes: determining an arrival angle of the interference signal to the current cell; and determining, according to the angle of arrival, the orientation information of the interference source cell relative to the current cell. In this embodiment, the base station may estimate an angle of arrival of the interference signal according to the channel estimation result of the CRS sequence, where the angle of arrival may be obtained according to a phase difference of channel estimation results on different antennas of the CRS sequence, or may be blind The test was obtained.

The present disclosure is generally described below in conjunction with specific embodiments:

Specific embodiment 1

In this embodiment, a method for a base station to locate an interference source cell is provided. As shown in FIG. 4, the method includes:

Step S402, the base station performs interference measurement on the received signal, and when there is neighbor cell interference, the base station extracts the interference signal from the received signal;

Optionally, when the foregoing base station extracts the interference signal from the received signal, the base station may extract the common uplink time slot or extract the normal uplink time slot and the uplink pilot time slot UpPTS. Preferably, in order to avoid the signal including the local cell (ie, the cell of the base station, corresponding to the current cell), it may be performed when the local cell is idling.

Optionally, in order to obtain more interference signal information and expand the extracted range, some or all downlink time slots of the base station (including the downlink pilot time slot DwPTS) may be silenced, so that the downlink time slots may also be extracted. The above interference signal.

Step S404, the base station analyzes and detects the interference signal to obtain an interference cell reference signal sequence, and the detection process is as shown in FIG. 5, including steps S4041-4044:

Step S4041: The base station performs time domain symbol synchronization on the interference signal.

The method for synchronizing the time domain symbols may include: using the CP to be a characteristic of the tail repetition of the OFDM symbol, performing correlation detection on the CP of the OFDM symbol and the repeated part, and searching for the interference signal from the back to the front, and the peak position is Symbol synchronization position. In order to improve the accuracy, the correlation detection can be performed simultaneously with the CP of the plurality of OFDM symbols and the repeated portion.

Step S4042: The base station performs time-frequency domain transform on the interference signal after the time domain symbol synchronization to obtain a frequency domain interference signal.

Step S4043: The base station determines, according to characteristics of the frequency domain signal, a symbol in which the cell reference signal sequence in the interference signal is located;

Alternatively, in the TD-LTE system, the transmission position of the cell reference signal CRS sequence (which may also be simply referred to as CRS) is fixed, and the transmission power is generally higher than the data symbols. As shown in Figure 6, the CRS is fixed at the symbol 0 and 4 of each slot when the single-port prefix is used. The two-port CRS is the same as the single-port occupant, but the number of resource elements is doubled. The number of resources and resource elements is more, and is full bandwidth transmission. According to this feature, it is possible to determine which symbols are symbols for transmitting the CRS.

Step S4044: The base station performs a cell reference signal on the symbol where the reference signal sequence is located. Sequence detection, determining a cell reference signal sequence that has interference to the base station;

Specifically, in a TD-LTE system, a cell reference signal sequence

defined as:

Wherein, the pseudo-random sequence c(i) is defined by a Gold sequence of length 31:

c(n)=(x ₁ (n+N _C )+x ₂ (n+N _C ))mod2

x ₁ (n+31)=(x ₁ (n+3)+x ₁ (n)) mod2

x ₂ (n+31)=(x ₂ (n+3)+x ₂ (n+2)+x ₂ (n+1)+x ₂ (n)) mod2

Where N _C = 1600, the initial value of the first m sequence is x ₁ (0) = 1, x ₁ (n) = 0, n = 1, 2, ..., 30, the second m-sequence Initial value

which is

n _s is the slot index in the radio frame, and l is the symbol index in the subframe.

Is a cell identification, N _CP commonly used for the normal cyclic prefix value of 1, N _CP for extended cyclic prefix is 0.

It can be seen that, in the case that the cyclic prefix is known, and the CRS symbol used for traversing matching in step S4044 is known, N _CP , n _s and l are all determined. At this time, the cell reference signal sequence only matches the cell identifier.

Related, there are 504 possibilities.

Perform traversal matching on 504 possible CRS sequences, similar to blind detection, select one or several CRS sequences with the highest matching correlation as CRS sequences that interfere with the base station, or select CRS sequences whose matching correlation is higher than a certain threshold. Interfering with the CRS sequence of the base station.

The traversal matching of the CRS sequence is independent of whether the interference source base station transmits the PDSCH signal. For example, Time Division Duplex (TDD) special subframe ratio 0 and special subframe ratio 5, DwPTS only contains 3 downlink symbols. At this time, the downlink PDSCH signal is not transmitted in the DwPTS, but the downlink can be sent. The Physical Downlink Control Channel (PDCCH) signal still has a CRS sequence.

Optionally, in the embodiment of the present disclosure, traversal matching may be performed only on one CRS symbol, and multiple CRS symbols may be matched to improve accuracy. The multiple CRS symbols used for traversing matching may be within the DwPTS only, or within a normal downlink subframe, or simultaneously. Distributed in DwPTS and normal downlink subframes.

Step S406: The base station determines a cell identifier of the interference source cell according to the cell identifier used when the cell reference signal sequence is generated.

Optionally, the cell identifier used when the cell reference signal sequence detected in step S4044 is generated may be set as

The interference cell identifier can be obtained by the following formula

Specific embodiment 2

Another method for locating an interference source cell is provided in this embodiment. The method is described below:

The manner of locating the interference source cell in the embodiment of the present disclosure is mostly the same as the method in the specific embodiment 1, except that step S4044.

In this embodiment, in the foregoing step S4044, before the traversal matching of the possible CRS sequences, the range of possible CRS sequences may be narrowed according to the resource element (Resource Element, RE for short) position occupied by the CRS frequency domain. And performing traversal matching on the narrowed-out CRS sequence to obtain a cell reference signal sequence that interferes with the base station.

Optionally, in a TD-LTE system, a cell reference signal sequence

Will be mapped to complex modulation symbols

Above, used as the reference symbol for the antenna port p in slotn _s :

among them,

k=6m+(v+v _shift )mod6

Where v and v _shift define the position of the frequency domain for different reference signals.

Cell-specific frequency shift

It can be seen from the above formula that the location of the resource element occupied by the CRS frequency domain is related to v _shift , according to which the range of the blindly detected CRS sequence can be reduced to the initialization used.

Satisfy

The range equivalent to blind detection is reduced to 1/6 of the original, that is, 84 possibilities. For example, if the resource element position occupied by the CRS on port 0 symbol 0 is at

resource elements

0 and 6, then v _shift =0, the range of CRS sequences that need to be blindly detected is reduced to the initialization used.

Satisfy

In the range.

The cell identifier used when the detected cell reference signal sequence is generated is

The interference cell identifier can be obtained by the following formula

Specific embodiment 3

In this embodiment, a method for locating an interference source cell is also provided. As shown in FIG. 7, the method includes the following steps:

Step S702 to step S706 are the same as steps S402-S406 in the specific embodiment 1, or are the same as all the steps in the specific embodiment 2;

Step S708: The base station obtains a distance between the interference source cell and the current cell according to the number of interference symbols that the interference signal falls in the uplink time slot of the received signal.

Optionally, in the TD-LTE system, the number of interference symbols that the interference signal falls in the uplink time slot of the received signal (including falling in the system uplink pilot time slot and the normal uplink subframe) is N _I , and the system protection interval is GP. The corresponding number of symbols is N _GP , and the total length of each symbol including the cyclic prefix is T _sym seconds, and the distance D between the interference source cell and the current cell can be calculated according to the following formula:

D=(N _I +N _GP )*T _sym *3*10 ⁸

Wherein, N _I may be an integer or a non-integer, that is, a fractional part may be used.

Step S710: The base station estimates an arrival angle of the interference signal according to the channel estimation result of the cell reference signal sequence, and obtains orientation information of the interference source cell relative to the current cell.

Optionally, the angle of arrival of the interference signal may be obtained according to a phase difference of channel estimation results on different antennas of the cell reference signal sequence, or may be obtained according to blind detection.

Step S712: The base station determines the interference cell according to the distance information of the interference source cell and the current cell, the azimuth information of the interference source cell with respect to the current cell, and the cell identifier of the interference source cell.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, portions of the technical solutions of the present disclosure that contribute substantially or to the prior art may be embodied in the form of a software product stored in a storage medium (eg, ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present disclosure.

In this embodiment, a positioning device for the interference source cell is also provided. The device is used to implement the foregoing embodiments and the preferred embodiments, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 8 is a structural block diagram of a positioning apparatus of an interference source cell according to an embodiment of the present disclosure. As shown in FIG. 8, the apparatus includes an obtaining module 82, a first determining module 84, and a second determining module 86. Description:

The obtaining module 82 is configured to acquire an interference signal that interferes with the current cell; the first determining The module 84 is connected to the obtaining module 82, and is configured to determine a cell reference signal CRS sequence of the interference source cell that sends the interference signal according to the interference signal, and the second determining module 86 is connected to the first determining module 84, and is configured to be configured according to The above CRS sequence determines an interference source cell.

In an optional embodiment, the acquiring module 82 may obtain, by using at least one of the following manners, an interference signal that interferes with the current cell: acquiring the interference signal in an uplink time slot of the base station to which the current cell belongs; The interference signal is obtained in a downlink time slot of the base station.

In an optional embodiment, the acquiring module 82 may acquire the interference signal in an uplink time slot of the base station to which the current cell belongs by acquiring the current time slot in the uplink time slot of the base station when the current cell is in an idle state. In another optional embodiment, the obtaining module 82 may acquire an interference signal in a downlink time slot of a base station to which the current cell belongs by: after placing the downlink time slot in a silent state, at the base station The interference signal is obtained in the downlink time slot.

In an optional embodiment, the first determining module 84 may determine, according to the interference signal, a CRS sequence of the interference source cell that sends the interference signal by performing time domain to frequency domain transformation on the interference signal to obtain a frequency. a domain interference signal; determining, according to the frequency domain interference signal, a symbol in which the CRS sequence is located; determining the CRS sequence according to a symbol in which the CRS sequence is located.

In an optional embodiment, the first determining module 84 may perform time domain to frequency domain transformation on the interference signal by performing time domain symbol synchronization on the interference signal and time domain symbol synchronization. The interference signal undergoes a time domain to frequency domain transformation.

In an optional embodiment, the first determining module 84 may determine a CRS sequence according to a symbol in which the CRS sequence is located by determining a value set of the CRS sequence according to the symbol of the CRS sequence, and by using the CRS sequence. The values in the set of values are traversed to determine the actual value of the CRS sequence.

In an optional embodiment, the first determining module 84 may determine the actual take of the CRS sequence by performing traversal matching on the values in the set of values of the CRS sequence. a value: determining, according to the location of the resource block occupied by the CRS sequence in the frequency domain, the obtained subset of the CRS sequence from the foregoing set of values; determining, by performing traversal matching on the values in the subset of values of the CRS sequence The actual value of the CRS sequence.

In an optional embodiment, the second determining module 86 may determine, according to the CRS sequence, the interference source cell by: determining, according to the cell identifier used when the CRS sequence is generated, the cell identifier of the interference source cell; according to the interference source cell The cell identity identifies the interferer cell.

In an optional embodiment, the second determining module 86 may determine the interference source cell according to the cell identifier of the interference source cell by determining a distance between the interference source cell and the current cell, and/or determining the interference source. The location information of the cell relative to the current cell; the interference source cell is determined according to the determined distance, the location information, and the cell identity of the interference source cell.

In an optional embodiment, the foregoing second determining module 86 may determine the distance between the interference source cell and the current cell by: determining the distance D by the following formula: D = (N _I + N _GP ) × T _sym × 3×10 ⁸ , where N _I is the number of interference symbols in the uplink time slot of the received signal received by the current cell, N _GP is the number of symbols corresponding to the system protection interval GP, and T _sym is a single number including the cyclic prefix The total length of the symbol time domain.

In an optional embodiment, the determining, by the second determining module 86, the location information of the interference source cell relative to the current cell may be: determining an arrival angle of the interference signal to the current cell; determining interference according to the foregoing angle of arrival. The orientation information of the source cell relative to the current cell.

In an alternative embodiment, a base station is also provided, the base station comprising the apparatus described above.

The above device will be described below in conjunction with a base station:

In this embodiment, a device for locating an interference source cell is provided. As shown in FIG. 9, the device includes: an interference signal measurement and extraction unit 92 (corresponding to the above-mentioned acquisition module 82), and an interference signal detection unit 94 ( Corresponding to the first determining module 84) and the identifier determining unit 96 (corresponding to the second determining module 86 described above), wherein:

The interference signal measuring and extracting unit 92 is configured to perform interference measurement on the received signal by the base station. The amount, when there is neighbor cell interference, the base station extracts the interference signal from the received signal;

The interference signal detecting unit 94 is configured to perform analysis and detection on the interference signal by the base station, to obtain an interference cell reference signal sequence;

The identifier determining unit 96 is configured to determine, by the base station, the cell identifier of the interference source cell according to the cell identifier used when the interference cell reference signal sequence is generated.

Another embodiment of the apparatus for locating an interference source cell is provided in the embodiment of the present disclosure. As shown in FIG. 10, the apparatus includes: an interference signal measurement and extraction unit 92, an interference signal detection unit 94, an identifier determination unit 96, and a distance estimation. Unit 102, angle of arrival estimation unit 104, and cell determination unit 106, wherein:

The distance estimating unit 102 is configured to obtain distance information of the interference source cell and the current cell according to the number of symbols of the uplink signal slot interference of the received signal according to the interference signal;

The angle of arrival estimation unit 104 is configured to estimate an angle of arrival of the interference signal according to a channel estimation result of the interference cell reference signal sequence, and obtain orientation information of the interference source cell relative to the current cell.

The cell determining unit 106 is configured to jointly determine the interference cell according to the distance information of the interference source cell and the current cell, the azimuth information of the interference source cell with respect to the current cell, and the interference source cell identity.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

Embodiments of the present disclosure also provide a storage medium. Alternatively, in the embodiment, the above storage medium may be arranged to store program code for performing the above steps.

Optionally, in the embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM). A variety of media that can store program code, such as a hard disk, a disk, or an optical disk.

Optionally, in the embodiment, the processor performs the above steps according to the stored program code in the storage medium.

In an alternative embodiment, an electronic device is also provided, the electronic device comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein The processor executes the method of any of the above by the computer program.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present disclosure described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. As such, the disclosure is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present disclosure, and is not intended to limit the disclosure, and various changes and modifications may be made to the present disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present disclosure are intended to be included within the scope of the present disclosure.

Industrial applicability

As described above, the method, device, and base station for locating an interference source cell provided by the embodiments of the present disclosure have the following beneficial effects: solving the problem that the interference source cannot be accurately located in the related art, and the accurate positioning of the interference source is achieved. In addition, the effect of interference is effectively eliminated.

Claims

A method for locating an interference source cell includes:

Obtaining an interference signal that interferes with the current cell;

Determining, according to the interference signal, a cell reference signal CRS sequence of an interference source cell that sends the interference signal;

The interference source cell is determined according to the CRS sequence.
The method of claim 1, wherein the obtaining the interference signal that interferes with the current cell comprises at least one of the following:

Acquiring the interference signal in an uplink time slot of the base station to which the current cell belongs;

Acquiring the interference signal in a downlink time slot of the base station to which the current cell belongs.
The method of claim 2, wherein

Acquiring the interference signal in the uplink time slot of the base station to which the current cell belongs includes: acquiring the interference in the uplink time slot of the base station when the current cell is in an idle state Signal; and / or,

Obtaining the interference signal in the downlink time slot of the base station to which the current cell belongs includes: acquiring the downlink time slot in a silent state, acquiring the downlink time slot in the base station Interference signal.
The method according to claim 1, wherein determining the CRS sequence of the interference source cell that transmits the interference signal according to the interference signal comprises:

Performing a time domain to frequency domain transform on the interference signal to obtain a frequency domain interference signal;

Determining, according to the frequency domain interference signal, a symbol in which the CRS sequence is located;

The CRS sequence is determined according to the symbol in which the CRS sequence is located.
The method of claim 4, wherein performing the time domain to frequency domain transform on the interference signal comprises:

Performing time domain symbol synchronization on the interference signal;

The time domain to frequency domain transform is performed on the interference signal subjected to time domain symbol synchronization.
The method according to claim 4 or 5, wherein determining the CRS sequence according to the symbol in which the CRS sequence is located comprises:

Determining a set of values of the CRS sequence according to a symbol in which the CRS sequence is located;

The actual value of the CRS sequence is determined by performing traversal matching on the values in the set of values of the CRS sequence.
The method according to claim 6, wherein determining the actual value of the CRS sequence by performing traversal matching on the values in the set of values of the CRS sequence comprises:

Determining, according to the location of the resource block occupied by the CRS sequence in the frequency domain, the derived subset of the CRS sequence from the set of values;

The actual value of the CRS sequence is determined by performing traversal matching on the values in the subset of values of the CRS sequence.
The method according to claim 1, wherein determining the interference source cell according to the CRS sequence comprises:

Determining a cell identifier of the interference source cell according to a cell identifier used when the CRS sequence is generated;

Determining the interference source cell according to the cell identity of the interference source cell.
The method according to claim 8, wherein determining the interference source cell according to the cell identity of the interference source cell comprises:

Determining a distance between the interference source cell and the current cell, and/or determining orientation information of the interference source cell relative to the current cell;

Determining the interference source cell according to the determined distance, the orientation information, and a cell identifier of the interference source cell.
The method according to claim 9, wherein determining the distance between the interference source cell and the current cell comprises:

The distance D is determined by the following formula:

D=(N I +N GP )×T sym ×3×10 8

Wherein, N I is the number of interference symbols in the uplink time slot of the received signal received by the current cell, N GP is the number of symbols corresponding to the system protection interval GP, and T sym is a single symbol including a cyclic prefix. The total length of the time domain.
The method according to claim 9, wherein determining the orientation information of the interference source cell relative to the current cell comprises:

Determining an arrival angle of the interference signal to the current cell;

Determining the orientation information of the interference source cell relative to the current cell according to the angle of arrival.
A positioning device for an interference source cell, comprising:

Obtaining a module, configured to acquire an interference signal that interferes with the current cell;

a first determining module, configured to determine, according to the interference signal, a cell reference signal CRS sequence of an interference source cell that sends the interference signal;

And a second determining module, configured to determine the interference source cell according to the CRS sequence.
The method according to claim 12, wherein the obtaining module acquires the interference signal that interferes with the current cell by at least one of:

Acquiring the interference signal in an uplink time slot of the base station to which the current cell belongs;

Acquiring the interference signal in a downlink time slot of the base station to which the current cell belongs.
The method according to claim 12, wherein the first determining module determines the CRS sequence of the interference source cell that transmits the interference signal according to the interference signal by:

Performing a time domain to frequency domain transform on the interference signal to obtain a frequency domain interference signal;

Determining, according to the frequency domain interference signal, a symbol in which the CRS sequence is located;

The CRS sequence is determined according to the symbol in which the CRS sequence is located.
The method according to claim 12, wherein the second determining module determines the interference source cell according to the CRS sequence by:

Determining a cell identifier of the interference source cell according to a cell identifier used when the CRS sequence is generated;

Determining the interference source cell according to the cell identity of the interference source cell.
A base station comprising the apparatus of any one of claims 12 to 15.
A storage medium, characterized in that the storage medium comprises a stored program, wherein the program is executed to perform the method of any one of claims 1 to 11.