CN107801199B - Method, device and system for positioning interference source cell - Google Patents
Method, device and system for positioning interference source cell Download PDFInfo
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- CN107801199B CN107801199B CN201610812248.7A CN201610812248A CN107801199B CN 107801199 B CN107801199 B CN 107801199B CN 201610812248 A CN201610812248 A CN 201610812248A CN 107801199 B CN107801199 B CN 107801199B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
Abstract
The invention discloses a method, a device and a system for positioning an interference source cell, wherein the method comprises the steps of extracting an interference signal from a received signal; analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of the reference signal sequence of the interference cell; acquiring a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, detecting according to the time domain symbol position of the auxiliary synchronization signal to acquire an auxiliary synchronization signal sequence of the interference cell, and acquiring a cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell; and obtaining the cell identifier of the interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method, a device and a system for positioning an interference source cell.
Background
In the existing Long Term Evolution (LTE) System, the base stations are required to maintain strict Time synchronization, and generally, a Global Positioning System (GPS) synchronization mode is adopted to ensure the timing synchronization between the base stations. Because the network is distributed in the TD-LTE system in a mode of same frequency coverage, the mutual interference between adjacent cells exists. In addition, because uplink and downlink transmission of the TD-LTE system share frequency, in addition to the conventional inter-cell interference, in the TD-LTE system, there is also a situation that a downlink signal of a remote base station interferes with an uplink signal of a target cell.
Due to the propagation characteristics of electromagnetic waves, in some scenarios (factors such as air propagation environment and atmospheric waveguide effect), long-distance co-channel interference of the TD-LTE system may occur between base stations that are far away (several tens of kilometers or even several hundreds of kilometers), and after a downlink signal of a far-end transmission source reaches a target base station with near-end co-channel through propagation delay, the downlink signal 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 an effect of cumulative superposition of multiple base stations, such interference is shown in fig. 1.
In practical applications, when a cell of a base station is interfered by signals of other cells, the source of an interference signal needs to be analyzed, that is, a cell to which the interference signal belongs is determined, so that preparation is made for eliminating interference. If the cell of the base station cannot work normally due to the interference of other cells and cannot quickly locate the source of the interference signal, it is difficult to eliminate the interference signal, and the interfered cell cannot be quickly restored to a normal working state.
Meanwhile, in the initial application stage of the TD-LTE system, hot spot coverage is mainly considered in the network deployment, the far-end interference phenomenon is not very prominent, and the far-end interference is more prominent in the future. However, in the prior art, an effective detection method for far-end interference after TD-LTE networking is not available, and because the interference among the base stations has the characteristics of multi-station accumulation and superposition and wide range, the difficulty in positioning an interference source is higher.
Disclosure of Invention
In order to solve the problem of locating the interference source cell, the invention provides the following technical scheme:
in one aspect, the present invention discloses a method for positioning an interference source cell, where the method includes:
the base station extracts interference signals from the received signals;
the base station analyzes and detects the interference signal to obtain the time domain symbol position and the frequency domain resource element position of the reference signal sequence of the interference cell;
the base station obtains the time domain symbol position of the auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, obtains the auxiliary synchronization signal sequence of the interference cell according to the time domain symbol position detection of the auxiliary synchronization signal, and further obtains the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell;
and the base station obtains the cell identifier of the interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated.
Optionally, the extracting the interference signal from the received signal includes: and carrying out interference measurement on the received signals, and extracting interference signals from the received signals when the interference of the adjacent cells is determined to exist.
Optionally, the extracting the interference signal specifically includes:
an interference signal is raised on a common uplink time slot; and/or (c) and/or,
extracting interference signals on an uplink pilot frequency time slot; and/or (c) and/or,
extracting an interference signal at a guard interval; and/or (c) and/or,
extracting interference signals by utilizing an uplink time slot and/or an uplink pilot time slot when the cell is in no-load; and/or (c) and/or,
when part or all downlink time slots of the base station are in the silent period, extracting interference signals in the downlink time slots in the silent period.
Optionally, the analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of the reference signal sequence of the interfering cell includes:
converting the interference signal from a time domain to a frequency domain, and determining a time domain symbol position and a frequency domain resource element position where the cell reference signal sequence is located according to the characteristics of the frequency domain signal;
or
Firstly, time domain symbol synchronization is carried out on an interference signal, then the interference signal is converted from a time domain to a frequency domain, and according to the characteristics of the frequency domain signal, the time domain symbol position and the frequency domain resource element position of a cell reference signal sequence are determined.
Optionally, the analyzing and detecting the interference signal further includes obtaining a distance between the interference source cell and the current cell according to the number of interference symbols of the interference signal falling in the uplink timeslot of the received signal; after the cell identifier of the interference source cell is obtained from the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used in the generation of the secondary synchronization signal sequence of the interference cell, the interference source cell is co-located according to the distance between the interference source cell and the current cell and the cell identifier of the interference source cell.
Optionally, the analyzing and detecting the interference signal further includes estimating an arrival angle of the interference signal according to a channel estimation result of the cell reference signal sequence, so as to obtain azimuth information of the interference source cell relative to the current cell; after the cell identifier of the interference source cell is obtained from the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used in the generation of the secondary synchronization signal sequence of the interference cell, the interference source cell is co-located according to the orientation information of the interference source cell relative to the current cell and the cell identifier of the interference source cell.
Optionally, the analyzing and detecting the interference signal further includes obtaining a distance between the interference source cell and the current cell according to the number of interference symbols of the interference signal falling in the uplink timeslot of the received signal; estimating the arrival angle of the interference signal according to the channel estimation result of the cell reference signal sequence; and after the cell identifier of the interference source cell is obtained from the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used in the generation of the secondary synchronization signal sequence of the interference cell, determining the interference source cell according to the cell identifier of the interference source cell, the distance between the interference source cell and the current cell and the orientation information of the interference source cell relative to the current cell.
Optionally, the angle of arrival is obtained according to a phase difference of channel estimation results of the reference signal sequence of the interfering cell or the secondary synchronization signal sequence of the interfering cell on different antennas, or obtained according to blind detection
In another aspect, the present invention discloses an apparatus for locating an interference source cell, the apparatus comprising:
interference signal measurement and extraction unit, district reference signal position detecting element, supplementary synchronizing signal detecting element and sign confirm the unit, wherein:
an interference signal extraction unit for extracting an interference signal from the received signal;
the cell reference signal position detection unit is used for analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of an interference cell reference signal sequence;
the auxiliary synchronization signal detection unit is used for obtaining a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, obtaining an auxiliary synchronization signal sequence of the interference cell according to the time domain symbol position of the auxiliary synchronization signal, and further obtaining a cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell;
and the identification determining unit is used for obtaining the cell identification of the interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identification used when the secondary synchronization signal sequence of the interference cell is generated.
The device for locating the interference source cell may further include a distance estimation unit, an arrival angle estimation unit, and a cell determination unit: the distance estimation unit is used for obtaining the distance information between the interference source cell and the current cell according to the number of the symbols interfered by the interference signal in the uplink time slot of the received signal; the arrival angle estimation unit is used for estimating the arrival angle of the interference signal according to the channel estimation result of the reference signal sequence or the auxiliary synchronization signal sequence of the interference cell to obtain the direction information of the interference source cell relative to the current cell; and the cell determining unit is used for determining the interference cell according to the distance information between the interference source cell and the current cell, the direction information of the interference source cell relative to the current cell and the identification of the interference source cell.
Meanwhile, the invention discloses a system for updating the status report of the buffer area of the retransmission data packet, which comprises the following components: at least one processor configured to: extracting an interference signal from the received signal; analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of the reference signal sequence of the interference cell; acquiring a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, detecting according to the time domain symbol position of the auxiliary synchronization signal to acquire an auxiliary synchronization signal sequence of the interference cell, and acquiring a cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell; obtaining a cell identifier of an interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated; a memory coupled to the at least one processor.
The method, the device and the system for positioning the interference source cell can determine the cell identification of the interference source cell, and the scheme can accurately lock the interference source cell by combining the distance and the direction information in consideration of the possibility of the repetition of the actual networking cell identification, thereby realizing the scheme for positioning the source of the interference signal.
Drawings
FIG. 1 is a schematic diagram of long-distance co-channel interference of a TD-LTE system;
fig. 2 is a flowchart of a method for locating an interferer cell disclosed herein;
fig. 3 is a flowchart of a method for cell reference signal sequence detection according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a single-port, two-port and four-port CRS transmission position under a common cyclic prefix in a TD-LTE system;
fig. 5 is a schematic diagram of time domain symbol positions of a common cyclic prefix, an uplink-downlink ratio 2, a special subframe ratio 6, a single port, a cell reference signal sequence and an auxiliary synchronization signal sequence in a subframe in a TD-LTE system;
fig. 6 is a flowchart of another method for locating an interferer cell in accordance with an embodiment of the present invention;
fig. 7 is a schematic diagram of an apparatus for locating an interferer cell according to an embodiment of the present invention;
fig. 8 is a schematic diagram of another apparatus for locating an interferer cell according to an embodiment of the present invention.
Detailed Description
In the solution disclosed in the present invention, as shown in fig. 2, the method for locating an interferer cell includes:
201. the base station extracts interference signals from the received signals;
202. the base station analyzes and detects the interference signal to obtain the time domain symbol position and the frequency domain resource element position of the reference signal sequence of the interference cell;
203. the base station obtains the time domain symbol position of the auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, obtains the auxiliary synchronization signal sequence of the interference cell according to the time domain symbol position detection of the auxiliary synchronization signal, and further obtains the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell;
204. and the base station obtains the cell identifier of the interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated.
The scheme disclosed by the invention can be used for determining the cell identification of the interference source cell, and considering that the identification of the actual networking cell may be repeated, the scheme can be used for simultaneously combining the distance information and the direction information, so that the interference source cell can be accurately locked, and the scheme for positioning the source of the interference signal is realized.
The main implementation principle, the specific implementation manner and the achievable advantages of the technical solution disclosed by the present invention are explained in detail by the following specific embodiments and the accompanying drawings.
The first embodiment is as follows: a method for locating an interferer cell, as shown in fig. 2, the method comprising:
specifically, when the base station extracts the interference signal from the received signal, the base station may extract both the interference signal and/or the Uplink Pilot Time Slot (UpPTS). In order to avoid including the signal of the cell, the method can also be performed by using the common uplink time slot and the uplink pilot time slot when the cell is idle.
In order to obtain more interference signal information and expand the extraction range, the Guard Period (GP for short) can be extracted.
Meanwhile, when part or all downlink time slots of the base station are in the silent period, the interference can be extracted from the downlink time slots in the silent period.
cell reference signal sequence in TD-LTE system
Is mapped to complex modulation symbols
As antenna port p in
Reference symbol of (2):
wherein the content of the first and second substances,
k＝6m+(v+vshift)mod6
v and vshiftThe locations of the frequency domains are defined for different reference signals.
Cell-specific frequency shift
Where k denotes a frequency domain resource element index and l denotes a time domain symbol index.
It can be seen that the time domain symbol position of the Cell-specific Reference Signals (CRS for short) is fixed, and the position of the resource element occupied by the frequency domain and vshiftIn relation to this, in an actual system, the transmission power of the CRS is generally higher than that of the data symbol and is full-bandwidth transmission, and according to these characteristics, the time domain symbol position and the frequency domain resource element position where the CRS is located can be determined. As shown in fig. 4, CRS is fixed to symbols 0 and 4 of each timeslot for transmission when a single port is used under a normal cyclic prefix, CRS resource elements are fixed at an interval 6 on a single symbol, CRS of two ports occupies the same symbol as a single port, but the number of resource elements is doubled, and the number of CRS symbols and the number of resource elements are more at four ports. In fig. 4, the resource element positions occupied by CRS on port 0 symbol 0 are in resource elements 0 and 6, then vshiftWhen equals 0, the interference cell identification is described
Satisfy the requirement of
specifically, in the TD-LTE system, the time domain symbol positions of the cell reference signal and the secondary synchronization signal are fixed, as shown in fig. 5, taking downlink ratio 2 and special subframe ratio 6 as an example, a downlink pilot time slot DwPTS in a special subframe occupies 9 symbols, a guard interval GP occupies 3 symbols, and an uplink pilot time slot UpPTS occupies 2 symbols, which gives a schematic position diagram of a cell reference signal CRS and a secondary synchronization signal SSS under a single port. It can be seen that when the time domain symbol position of the CRS is determined, the time domain symbol position of the SSS can be determined.
And step 204, the base station obtains the cell identifier of the interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the secondary synchronization signal sequence of the interference cell is generated.
If the CRS deviant value determined by the frequency domain resource element position of the interference cell reference signal sequence is vshiftThe cell identification used in the generation of the interference cell secondary synchronization signal sequence is
The interfering cell identity can be obtained
Can be obtained by the following formula:
example two: a method for locating an interferer cell, as shown in fig. 6, the method comprising:
601, the base station performs interference measurement on the received signal, and when the adjacent cell interference exists, the base station extracts an interference signal from the received signal;
603, the base station obtains the time domain symbol position of the auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, obtains the auxiliary synchronization signal sequence of the interference cell according to the time domain symbol position detection of the auxiliary synchronization signal, and further obtains the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell
605, the base station obtains the distance between the interference source cell and the current cell according to the number of interference symbols of the interference signal falling in the uplink time slot of the received signal;
specifically, in the TD-LTE system, the number of interference symbols (including the uplink pilot time slot and the uplink U subframe) in which the interference signal falls in the uplink time slot of the received signal is set to NIThe number of symbols corresponding to the system guard interval GP is NGPEach symbol comprises a cyclic prefix corresponding to a time domain with a length of TsymAnd second, calculating the distance D m between the interference source cell and the current cell according to the following formula:
D＝(NI+NGP)*Tsym*3*108
wherein N isIMay be an integer or a non-integer, i.e. may have a fractional part.
specifically, 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 the secondary synchronization signal sequence, or may be obtained according to blind detection.
Example three: in this embodiment, an apparatus for locating an interferer cell is provided, and as shown in fig. 7, the apparatus includes: interference signal measurement and extraction unit, district reference signal position detecting element, supplementary synchronizing signal detecting element and sign confirm the unit, wherein:
an interference signal extraction unit 701 for extracting an interference signal from the received signal;
a cell reference signal position detection unit 702, configured to analyze and detect the interference signal to obtain a time domain symbol position and a frequency domain resource element position of an interference cell reference signal sequence;
an auxiliary synchronization signal detection unit 703, configured to obtain a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interfering cell, and obtain an auxiliary synchronization signal sequence of the interfering cell according to the time domain symbol position of the auxiliary synchronization signal, so as to obtain a cell identifier used when the auxiliary synchronization signal sequence of the interfering cell is generated according to the auxiliary synchronization signal sequence of the interfering cell;
an identifier determining unit 704, configured to obtain a cell identifier of an interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the secondary synchronization signal sequence of the interference cell is generated.
Example four: the embodiment provides a device for positioning an interference source cell, which includes an interference signal measuring and extracting unit, an interference signal detecting unit, an identifier determining unit, a distance estimating unit, an angle of arrival estimating unit, and a cell determining unit as shown in fig. 8, wherein:
an interference signal measurement and extraction unit 801, configured to perform interference measurement on a received signal, and extract an interference signal from the received signal when there is neighboring cell interference;
a cell reference signal position detection unit 802, configured to analyze and detect the interference signal to obtain a time domain symbol position and a frequency domain resource element position of an interference cell reference signal sequence;
an auxiliary synchronization signal detection unit 803, configured to obtain a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interfering cell, and obtain an auxiliary synchronization signal sequence of the interfering cell according to the time domain symbol position of the auxiliary synchronization signal, so as to obtain a cell identifier used when the auxiliary synchronization signal sequence of the interfering cell is generated according to the auxiliary synchronization signal sequence of the interfering cell;
an identifier determining unit 804, configured to obtain a cell identifier of an interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the secondary synchronization signal sequence of the interference cell is generated;
a distance estimation unit 805, configured to obtain distance information between an interference source cell and a current cell according to the number of symbols interfered by an interference signal in an uplink timeslot of a received signal;
an arrival angle estimating unit 806, configured to estimate an arrival angle of the interfering signal according to a channel estimation result of the reference signal sequence or the secondary synchronization signal sequence of the interfering cell, to obtain direction information of the interfering source cell relative to the current cell;
a cell determining unit 807, configured to determine an interfering cell jointly according to the distance information between the interfering source cell and the current cell, the orientation information of the interfering source cell relative to the current cell, and the interfering source cell identifier.
Example five: the embodiment provides a system for positioning an interference source cell, which includes: at least one processor configured to: extracting an interference signal from the received signal; analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of the reference signal sequence of the interference cell; acquiring a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, detecting according to the time domain symbol position of the auxiliary synchronization signal to acquire an auxiliary synchronization signal sequence of the interference cell, and acquiring a cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell; obtaining a cell identifier of an interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated; a memory coupled to the at least one processor.
From the above description, it can be seen that, according to the method, the apparatus, and the device provided in the embodiments of the present invention, the distance and the direction information are combined at the same time, so that the cell of the interference source can be accurately locked, thereby achieving the purpose of locating the source of the interference signal.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings and description that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention. While the features of the embodiments and examples may be combined with each other without conflicting information.
It should be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (11)
1. A method for locating an interferer cell, the method comprising:
extracting an interference signal from the received signal;
analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of the reference signal sequence of the interference cell;
acquiring a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, detecting according to the time domain symbol position of the auxiliary synchronization signal to acquire an auxiliary synchronization signal sequence of the interference cell, and acquiring a cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell;
and obtaining the cell identifier of the interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated.
2. The method of claim 1, wherein the extracting the interference signal from the received signal comprises:
and carrying out interference measurement on the received signals, and extracting interference signals from the received signals when the interference of the adjacent cells is determined to exist.
3. The method of claim 2, wherein the extracting the interference signal specifically comprises:
extracting interference signals in a common uplink time slot; and/or (c) and/or,
extracting interference signals in an uplink pilot frequency time slot; and/or (c) and/or,
extracting an interference signal at a guard interval; and/or (c) and/or,
extracting interference signals by utilizing an uplink time slot and/or an uplink pilot time slot when the cell is in no-load; and/or (c) and/or,
when part or all downlink time slots of the base station are in the silent period, extracting interference signals in the downlink time slots in the silent period.
4. The method of any one of claims 1 to 3, wherein the analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of an interfering cell reference signal sequence comprises:
transforming the interference signal from a time domain to a frequency domain, and determining a time domain symbol position and a frequency domain resource element position of the reference signal sequence of the interference cell according to the characteristics of the frequency domain signal;
or
Firstly, time domain symbol synchronization is carried out on an interference signal, then the interference signal is converted from a time domain to a frequency domain, and the time domain symbol position and the frequency domain resource element position of the interference cell reference signal sequence are determined according to the characteristics of the frequency domain signal.
5. The method of claim 4, wherein the analyzing and detecting the interference signal further comprises obtaining a distance between an interference source cell and a current cell according to the number of interference symbols of the interference signal falling in an uplink timeslot of the received signal, and after obtaining a cell identifier of the interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used in the generation of the secondary synchronization signal sequence of the interference cell, co-locating the interference source cell according to the distance between the interference source cell and the current cell and the cell identifier of the interference source cell.
6. The method of claim 4, wherein the analyzing and detecting the interference signal further comprises estimating an angle of arrival of the interference signal according to a channel estimation result of the reference signal sequence of the interference cell, so as to obtain the azimuth information of the interference source cell relative to the current cell; after the cell identifier of the interference source cell is obtained according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used in the generation of the secondary synchronization signal sequence of the interference cell, the interference source cell is co-located according to the orientation information of the interference source cell relative to the current cell and the cell identifier of the interference source cell.
7. The method of claim 5, wherein the analyzing and detecting the interference signal further comprises estimating an angle of arrival of the interference signal according to a channel estimation result of the reference signal sequence of the interference cell, so as to obtain azimuth information of the interference source cell relative to the current cell; after the cell identifier of the interference source cell is obtained according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated, the interference source cell is determined according to the cell identifier of the interference source cell, the distance between the interference source cell and the current cell and the orientation information of the interference source cell relative to the current cell.
8. The method of claim 6 or 7, wherein the angle of arrival is obtained from a phase difference of channel estimation results of the reference signal sequence of the interfering cell or the secondary synchronization signal sequence of the interfering cell on different antennas, or obtained from blind detection.
9. An apparatus for locating an interferer cell, the apparatus comprising an interferer measurement and extraction unit, a cell reference signal position detection unit, a secondary synchronization signal detection unit, and an identity determination unit, wherein:
an interference signal measuring and extracting unit for extracting an interference signal from the received signal;
the cell reference signal position detection unit is used for analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of an interference cell reference signal sequence;
the auxiliary synchronization signal detection unit is used for obtaining a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, obtaining an auxiliary synchronization signal sequence of the interference cell according to the time domain symbol position of the auxiliary synchronization signal, and further obtaining a cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell;
and the identification determining unit is used for obtaining the cell identification of the interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identification used when the secondary synchronization signal sequence of the interference cell is generated.
10. The apparatus of claim 9, further comprising a distance estimation unit, an angle of arrival estimation unit, and a cell determination unit: the distance estimation unit is used for obtaining the distance information between the interference source cell and the current cell according to the number of interference symbols of the interference signals falling in the uplink time slot of the received signals; the arrival angle estimation unit is used for estimating the arrival angle of the interference signal according to the channel estimation result of the reference signal sequence or the auxiliary synchronization signal sequence of the interference cell to obtain the direction information of the interference source cell relative to the current cell; and the cell determining unit is used for determining the interference cell according to the distance information between the interference source cell and the current cell, the direction information of the interference source cell relative to the current cell and the identification of the interference source cell.
11. A system for locating an interferer cell, the system comprising: at least one processor configured to: extracting an interference signal from the received signal; analyzing and detecting the interference signal to obtain a time domain symbol position and a frequency domain resource element position of the reference signal sequence of the interference cell; acquiring a time domain symbol position of an auxiliary synchronization signal according to the time domain symbol position of the reference signal sequence of the interference cell, detecting according to the time domain symbol position of the auxiliary synchronization signal to acquire an auxiliary synchronization signal sequence of the interference cell, and acquiring a cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated according to the auxiliary synchronization signal sequence of the interference cell; obtaining a cell identifier of an interference source cell according to the frequency domain resource element position of the reference signal sequence of the interference cell and the cell identifier used when the auxiliary synchronization signal sequence of the interference cell is generated; a memory coupled to the at least one processor.
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| CN112586025B (en) | 2018-08-21 | 2023-05-16 | 中兴通讯股份有限公司 | Remote interference identification and mitigation |
| CN111148124B (en) * | 2018-11-02 | 2022-05-24 | 华为技术有限公司 | Transmission method of reference signal and communication device |
| CN111182573B (en) * | 2018-11-09 | 2023-05-05 | 中国移动通信有限公司研究院 | Signal transmission method, network parameter configuration method and communication equipment |
| CN111181703B (en) * | 2018-11-12 | 2022-08-23 | 中国移动通信有限公司研究院 | Reference signal resource allocation method, network equipment and storage medium |
| CN111464261B (en) * | 2019-01-22 | 2021-07-23 | 大唐移动通信设备有限公司 | Signal transmission and detection method and device |
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