WO2018064909A1 - 干扰源小区定位方法和装置以及对应的基站 - Google Patents
干扰源小区定位方法和装置以及对应的基站 Download PDFInfo
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- WO2018064909A1 WO2018064909A1 PCT/CN2017/094268 CN2017094268W WO2018064909A1 WO 2018064909 A1 WO2018064909 A1 WO 2018064909A1 CN 2017094268 W CN2017094268 W CN 2017094268W WO 2018064909 A1 WO2018064909 A1 WO 2018064909A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- the present disclosure relates to the field of communications technologies, and in particular, to an interference source cell positioning method and apparatus, and a corresponding base station.
- the base station For the TD-LTE (Time Division Long Term Evolution) system, the base station is required to maintain strict time synchronization, and GPS synchronization is generally used to ensure timing synchronization between base stations. Due to the use of the same frequency coverage, there is a mutual interference between adjacent cells. Moreover, 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, there is also a situation in which the downlink signal of the remote base station interferes with the uplink signal of the target cell.
- TD-LTE Time Division Long Term Evolution
- long-distance co-channel interference of TD-LTE systems may occur between base stations that are far apart (tens of kilometers or even hundreds of kilometers).
- the downlink signal of the remote source After the downlink signal of the remote source reaches the target base station of the near-end same frequency after the propagation delay, it may enter other transmission time slots of the target base station, thereby affecting the normal operation of the near-end target system, and the interference may be Multi-base station accumulates the effect of superposition.
- the target cell may have to traverse all possible bandwidth combinations to know which cell is performing interference.
- the ergodic detection needs to be different. The process of locating the source cell of the entire system can be quite complicated.
- the embodiments of the present invention provide an interference source cell positioning method and device, and a corresponding base station, to solve the problem of how to locate an interference source cell in a simple and efficient manner in a TD-LTE system.
- An embodiment of the present invention provides an interference source cell positioning method, where the method includes the steps of: receiving other cells to send Generating specific data generated according to the pilot sequence; parsing the specific data to obtain frequency domain data corresponding to each of the other cells at the aliasing bandwidth; generating corresponding corresponding locally according to all possible special pilot sequences in the system Frequency domain data; generating corresponding time domain data according to the locally generated frequency domain data and the parsed frequency domain data; and determining the interference source cell according to the obtained time domain data.
- the method before the step of receiving the specific data generated by the other cell according to the pilot sequence, the method further includes the steps of: generating time domain data according to the pilot sequence of each cell; and generating the time domain of each cell The data is added to the cyclic prefix CP to generate the specific data and transmitted.
- the method further includes: before the step of generating the time domain data according to the pilot sequence of each cell: setting an aliasing bandwidth B Inv of the entire system; and using the aliasing bandwidth B Inv as a basic unit, A pilot sequence for each cell in the system is set.
- the one with the smallest bandwidth is selected as the aliasing bandwidth B Inv of the entire system.
- the step of generating time domain data according to the pilot sequence of each cell specifically includes: inserting a value of 0 before or after or before and after the pilot sequence to generate a sequence of length N subcarrier , where N subcarrier The number of subcarriers included in the aliasing bandwidth B Inv ; performing positive and negative frequency switching on the sequence of length N subcarrier and inserting a value of 0 in the middle to generate N FFT point frequency domain data; and the N FFT point The frequency domain data is subjected to an inverse fast Fourier transform IFFT operation to generate N FFT point time domain data.
- the specific data is (N cp + 2 n * N FFT ) point data
- the step of parsing the specific data to obtain frequency domain data corresponding to each of the other cells at the aliasing bandwidth includes: Removing the N cp point CP from the specific data; taking the N FFT point time domain data corresponding to the aliasing bandwidth; performing fast Fourier transform FFT operation on the N FFT point time domain data to obtain N FFT point frequency domain data Y Inv .
- the step of generating the corresponding time domain data according to the locally generated frequency domain data and the parsed frequency domain data specifically includes: performing conjugate point multiplication on the locally generated frequency domain data and the parsed frequency domain data. Operation, obtaining R; performing an IFFT operation on R to obtain time domain data R t of N FFT points.
- the step of determining the interference source cell according to the obtained time domain data specifically includes: performing peak search on the time domain data R t corresponding to each of the other cells, and if the R t has a significant peak, the corresponding other cells are The interference source cell.
- the embodiment of the present invention further provides an interference source cell locating device, where the device includes: a receiving module, configured to receive specific data generated by another cell according to a pilot sequence; and a parsing module, configured to parse the specific data, to obtain other Frequency domain data corresponding to each cell at the aliasing bandwidth; a generating module, configured to locally generate corresponding frequency domain data according to all possible special pilot sequences in the system, and according to locally generated frequency domain data and parsing The generated frequency domain data generates corresponding time domain data; and the determining module is configured to determine the interference source cell according to the obtained time domain data.
- the generating module is further configured to generate time domain data according to a pilot sequence of each cell, and add the time domain data generated by each cell to the cyclic prefix CP to generate the specific data; the device further includes A transmitting module, configured to transmit the generated specific data to other cells.
- the apparatus further includes: a setting module, configured to set an aliasing bandwidth B Inv of the entire system, and set a pilot sequence of each cell in the system by using the aliasing bandwidth B Inv as a basic unit.
- a setting module configured to set an aliasing bandwidth B Inv of the entire system, and set a pilot sequence of each cell in the system by using the aliasing bandwidth B Inv as a basic unit.
- the step of generating, by the generating module, the time domain data according to the pilot sequence of each cell includes: inserting a value of 0 before or after or before and after the pilot sequence to generate a sequence of length N subcarrier , where N is the subcarrier number of the subcarrier bandwidth aliasing B Inv included; the sequence length N subcarrier frequency do exchange and negative value 0 is inserted in the middle, to generate an FFT point frequency domain data N; the N The FFT point frequency domain data is subjected to an inverse fast Fourier transform IFFT operation to generate N FFT point time domain data.
- the process of generating, by the generating module, the corresponding time domain data according to the locally generated frequency domain data and the parsed frequency domain data includes: performing the locally generated frequency domain data and the parsed frequency domain data.
- the conjugate point multiplication operation obtains R; performing an IFFT operation on R to obtain time domain data R t of the N FFT point.
- the embodiment of the present invention further provides a base station, including a baseband processing unit, where the baseband processing unit is configured to: receive specific data generated by another cell according to a pilot sequence; parse the specific data, and obtain each of the other Corresponding frequency domain data of the cell at the aliasing bandwidth; locally generating corresponding frequency domain data according to all possible special pilot sequences in the system; generating corresponding corresponding according to the locally generated frequency domain data and the parsed frequency domain data Time domain data; and determining the interference source cell based on the obtained time domain data.
- a base station including a baseband processing unit, where the baseband processing unit is configured to: receive specific data generated by another cell according to a pilot sequence; parse the specific data, and obtain each of the other Corresponding frequency domain data of the cell at the aliasing bandwidth; locally generating corresponding frequency domain data according to all possible special pilot sequences in the system; generating corresponding corresponding according to the locally generated frequency domain data and the parsed frequency domain data Time domain data; and determining the interference
- the baseband processing unit is further configured to: generate time domain data according to a pilot sequence of each cell; add the time domain data generated by each cell to the cyclic prefix CP, generate the specific data, and transmit the specific data. .
- the baseband processing unit is further configured to: set an aliasing bandwidth B Inv of the entire system; and set a pilot sequence of each cell in the system by using the aliasing bandwidth B Inv as a basic unit.
- the method and device for locating an interference source cell and the corresponding base station do not need to traverse and detect various bandwidth combinations when the system has aliasing of different bandwidths, and only needs to detect related possibilities at the aliasing bandwidth.
- the sequence can complete the detection and location of the interference source cell, thereby reducing the complexity of locating the interference source cell, and the process of detecting and locating is simple and efficient.
- FIG. 1 is a flowchart of a preferred embodiment of an interference source cell positioning method according to the present invention
- FIG. 2 is a schematic diagram of bandwidth of each cell in an embodiment of a TD-LTE system according to the present invention
- FIG. 3 is a flow chart of a preferred embodiment of a process for generating specific data by the first interfering cell and the second interfering cell in FIG. 2;
- FIG. 4 is a flow chart of a preferred embodiment of a process for generating specific data by a third interfering cell in FIG. 2;
- FIG. 5 is a flow chart of a preferred embodiment of a process for a target cell to locate an interferer cell in FIG. 2;
- FIG. 6 is a schematic block diagram of a preferred embodiment of an interference source cell positioning apparatus according to the present invention.
- an embodiment of the present invention provides an interference source cell positioning method, which is used in a base station of a TD-LTE system, and is used to accurately detect when a target cell (interfered cell) is interfered by a signal of a remote cell. Locate the interference source cell.
- the method includes the following steps:
- the communication system is a TD-LTE system. If there are multiple bandwidth combinations in each cell of the entire communication system, there is a portion of bandwidth overlap between them, and each overlapping portion is an aliasing bandwidth B Inv_x .
- the aliasing bandwidth B Inv_x (2) - N * B cell_n , where B cell_n is the total cell bandwidth of the communication system.
- the aliasing bandwidth can be one or more blocks.
- the one with the smallest bandwidth is selected as the aliasing bandwidth B Inv of the entire communication system.
- Aliasing band B Inv comprising N subcarrier subcarriers.
- the communication system in the figure is composed of cells of 20M and 10M bandwidth, and the target cell is interfered by three cells.
- the bandwidth of the target cell is 20 M
- the bandwidth of the first interfering cell is 20 M
- the bandwidth of the second interfering cell is 20 M
- the bandwidth of the third interfering cell is 10 M
- the aliasing bandwidth B Inv of the communication system is 10 M.
- the bandwidth of each cell in the communication system is divided into a plurality of parts by using the aliasing bandwidth B Inv as a basic unit, and a pilot sequence is generated for the frequency domain data corresponding to each part.
- the pilot sequence may be an m sequence, a gold sequence, a ZC sequence, or other sequences with good autocorrelation and poor cross-correlation.
- the length of the pilot sequence is less than N subcarrier and is denoted as N Sequence .
- the bandwidth of the first interfering cell (or the second interfering cell) in FIG. 2 is equal to two aliasing bandwidths B Inv , then the first interfering cell (or the second interfering cell) needs to set two pilot sequences N Sequence .
- S106 Generate time domain data according to a pilot sequence of each cell.
- a value of N subcarrier is generated before or after the pilot sequence N Sequence , and a sequence of length N subcarrier is generated, and then a positive and negative frequency exchange is performed and a value of 0 is inserted in the middle to generate N FFT point frequency domain data. Then, an IFFT (Inverse Fast Fourier Transform) operation is performed on the N FFT point frequency domain data to generate N FFT point time domain data.
- IFFT Inverse Fast Fourier Transform
- 2 n pilot sequences N Sequence are set , corresponding to generating 2 n N FFT points.
- the domain data is then combined with the generated 2 n N FFT point time domain data, and then the N cp point CP is added to the combined data.
- a pilot sequence N Sequence is set , correspondingly generating N FFT point time domain data, and then directly generating the generated N FFT point time domain data by adding N Cp point CP.
- the following steps may be performed to locate the interference source cell:
- the target cell receives the specific data transmitted by each of the other cells, and the specific data is (N cp + 2 n * N FFT ) point data.
- the N cp point CP is removed from the specific data, and the N FFT point time domain data corresponding to the aliasing bandwidth is taken. Then, an FFT (Fast Fourier Transform) operation is performed on the N FFT point time domain data to obtain N FFT point frequency domain data Y inv .
- FFT Fast Fourier Transform
- the target cell locally generates the frequency domain data S in the same manner as the above step S106 by using all possible special pilot sequences of length N Sequence in the communication system.
- N FFT point IFFT operation is performed on R to obtain time domain data R t of the N FFT point. For each of the other cells, a corresponding time domain data R t will be obtained.
- the peak search is performed on the time domain data R t corresponding to each of the other cells. If the local pilot sequence and the pilot sequence of the transmitting end (other cells) are the same, then R t has a distinct peak. , indicating that the other cell is the interference source cell, and the receiving end (target cell) can determine the information of the interference source cell.
- FIG. 5 a flowchart corresponding to the process of locating an interference source cell in the target cell in FIG. 2 (ie, steps S110-S118 described above) is performed.
- the interference source cell positioning method transmits specific data generated according to a specific pilot sequence in a specific time domain and frequency domain resource, and the target cell detects the specific data in a specific time domain and frequency domain resource.
- the specific data transmitted by each cell is known to all other cells in the communication system. When there are multiple different bandwidth aliases in the communication system, it is not necessary to traverse to detect various bandwidth combinations, and only need to detect relevant possible sequences at the aliasing bandwidth to complete the detection and location of the interference source cell.
- the method reduces the complexity of locating the interference source cell, and the process of detecting and locating is simple and efficient.
- an embodiment of the present invention provides an interference source cell locating device 600, which is used in a baseband processing unit of a base station of a TD-LTE system, and is used to accurately detect when a target cell receives signal interference from a remote cell. Locate the interference source cell.
- the interference source cell locating device 600 includes a setting module 602, a generating module 604, a transmitting module 606, a receiving module 608, a parsing module 610, and a determining module 612.
- the setting module 602 is configured to set an aliasing bandwidth of the entire communication system.
- the communication system is a TD-LTE system. If there are multiple bandwidth combinations in each cell of the entire communication system, there is a portion of bandwidth overlap between them, and each overlapping portion is an aliasing bandwidth B Inv_x .
- the aliasing bandwidth B Inv_x (2) - N * B cell_n , where B cell_n is the total cell bandwidth of the communication system.
- the aliasing bandwidth can be one or more blocks.
- the one with the smallest bandwidth is selected as the aliasing bandwidth B Inv of the entire communication system.
- Aliasing band B Inv comprising N subcarrier subcarriers.
- the setting module 602 is further configured to set a pilot sequence of each cell in the communication system by using the aliasing bandwidth as a basic unit.
- the bandwidth of each cell in the communication system is divided into a plurality of parts by using the aliasing bandwidth B Inv as a basic unit, and a pilot sequence is generated for the frequency domain data corresponding to each part.
- the pilot sequence may be an m sequence, a gold sequence, a ZC sequence, or other sequences with good autocorrelation and poor cross-correlation.
- the length of the pilot sequence is less than N subcarrier and is denoted as N Sequence .
- the generating module 604 is configured to generate time domain data according to a pilot sequence of each cell.
- a value of N subcarrier is generated before or after the pilot sequence N Sequence is inserted into a value of 0, and then a positive and negative frequency exchange is performed and a value of 0 is inserted in the middle to generate N FFT point frequency domain data. Then, an IFFT (Inverse Fast Fourier Transform) operation is performed on the N FFT point frequency domain data to generate N FFT point time domain data.
- IFFT Inverse Fast Fourier Transform
- the generating module 604 is further configured to add specific data by adding a CP (Cyclic Prefix) to the time domain data generated by each cell.
- CP Cyclic Prefix
- 2 n pilot sequences N Sequence are set , corresponding to generating 2 n N FFT points.
- the domain data is then combined with the generated 2 n N FFT point time domain data, and then the N cp point CP is added to the combined data.
- a pilot sequence N Sequence is set , corresponding to generating N FFT point time domain data, and then directly generating the generated N FFT point time domain data by adding N Cp point CP.
- the transmitting module 606 is configured to transmit the specific data to other cells.
- the receiving module 608 is configured to receive specific data transmitted by other cells.
- the target cell receives the specific data transmitted by each of the other cells, and the specific data is (N cp + 2 n * N FFT ) point data.
- the parsing module 610 is configured to parse the received specific data to obtain frequency domain data corresponding to each of the other cells at the aliasing bandwidth.
- the N cp point CP is removed from the specific data, and the N FFT point time domain data corresponding to the aliasing bandwidth is taken. Then, an FFT (Fast Fourier Transform) operation is performed on the N FFT point time domain data to obtain N FFT point frequency domain data Y inv .
- FFT Fast Fourier Transform
- the generating module 604 is further configured to locally generate corresponding frequency domain data according to all possible special pilot sequences in the communication system.
- the target cell locally generates the frequency domain data S in the same manner as the transmitting end of all possible special pilot sequences of the N Sequence in the communication system.
- the generating module 604 is further configured to perform conjugate point multiplication operation and IFFT operation on the locally generated frequency domain data and the parsed frequency domain data to obtain corresponding time domain data.
- N FFT point IFFT operation is performed on R to obtain time domain data R t of the N FFT point. For each of the other cells, a corresponding time domain data R t will be obtained.
- the determining module 612 is configured to determine an interference source cell according to the obtained time domain data.
- the peak search is performed on the time domain data R t corresponding to each of the other cells. If the local pilot sequence and the pilot sequence of the transmitting end (other cells) are the same, then R t has a distinct peak. , indicating that the other cell is the interference source cell, and the receiving end (target cell) can determine the information of the interference source cell.
- the interference source cell locating device 600 can be applied to a baseband processing unit of each cell (base station) of the TD-LTE system, and send specific data to other cells by performing the functions of the modules 602-606. .
- the interferer cell locating device 600 in the cell finds the interferer cell by performing the functions of the modules 608-612.
- the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and can also be implemented by hardware, but in many cases, the former is A better implementation.
- the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as 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, an air conditioner, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
- the technical solutions provided by the embodiments of the present invention can be applied to the field of communications technologies.
- the method and device for locating an interference source cell and the corresponding base station provided by the embodiments of the present invention do not need to traverse to detect various bandwidth combinations when the system has multiple different bandwidth aliases, and only needs to detect correlation at the aliasing bandwidth. Possible sequence, complete
- the detection and location of the interference source cell reduces the complexity of locating the interference source cell, and the process of detecting and positioning is simple and efficient.
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Abstract
本公开涉及一种干扰源小区定位方法和装置以及对应的基站,属于通讯技术领域。该方法包括:设置整个***的混叠带宽;以所述混叠带宽为基本单位,设置***中每个小区的导频序列;根据每个小区的导频序列生成时域数据;将每个小区生成的时域数据加上CP后生成特定数据,并发射出去;接收其他小区发射的所述特定数据;解析得到其他每个小区在混叠带宽处对应的频域数据;在本地根据***中所有可能的特殊导频序列生成对应的频域数据;根据本地生成的频域数据和解析出的频域数据生成对应的时域数据;根据得到的时域数据确定干扰源小区。由此可以简单高效的定位干扰源小区,降低***复杂度。
Description
本公开涉及通讯技术领域,尤其涉及干扰源小区定位方法和装置以及对应的基站。
对于TD-LTE(Time Division Long Term Evolution,分时长期演进)***,要求基站保持严格的时间同步,一般都是采用GPS同步的方式来保证基站之间的定时同步。由于采用同频覆盖的方式布网,固然存在邻小区间的相互干扰。而且由于TD-LTE***的上下行传输共享频率,因此TD-LTE***中除存在传统的小区间的干扰外,还存在远端基站的下行信号干扰目标小区上行信号的情形。
由于电磁波的传播特性,在某些场景(例如空气传播环境好、大气波导效应)下,TD-LTE***的远距离同频干扰可能发生在相距很远的基站间(几十公里甚至几百公里),并且远端发射源的下行信号经过传播延迟到达近端同频的目标基站后,可能会进入目标基站的其他传输时隙,从而影响近端目标***的正常工作,并且这种干扰可能是多基站累积叠加的效果。
实际应用中,可以考虑在实施干扰的小区的一定的时隙发射特定的自定义导频序列,然后在被干扰小区侧去检测该导频序列。由于该导频序列和实施干扰的小区通过一定的方式一一对应,所以被干扰小区就能知道是哪个远端小区对它实施了干扰。
但是,由于实际***中各个小区存在不同的带宽,若采用上述现有技术方案,则目标小区可能要遍历所有可能的带宽组合方式,才能得知实施干扰的是哪个小区。另外针对不同的目标小区,需要做的遍历检测也不一样。整个***定位干扰源小区的过程会相当复杂。
发明内容
本发明实施例提供一种干扰源小区定位方法和装置以及对应的基站,以解决在TD-LTE***中如何简单高效的定位干扰源小区的问题。
本发明实施例提供一种干扰源小区定位方法,该方法包括步骤:接收其他小区发
射的根据导频序列生成的特定数据;解析所述特定数据,得到其他每个小区在混叠带宽处对应的频域数据;在本地根据所述***中所有可能的特殊导频序列生成对应的频域数据;根据本地生成的频域数据和解析出的频域数据生成对应的时域数据;及根据得到的时域数据确定干扰源小区。
可选地,该方法在所述接收其他小区发射的根据导频序列生成的特定数据的步骤之前还包括步骤:根据每个小区的导频序列生成时域数据;将每个小区生成的时域数据加上循环前缀CP后生成所述特定数据,并发射出去。
可选地,该方法在所述根据每个小区的导频序列生成时域数据的步骤之前还包括步骤:设置整个***的混叠带宽BInv;以所述混叠带宽BInv为基本单位,设置所述***中每个小区的导频序列。
可选地,当所述***中存在多个混叠带宽时,选取其中带宽最小的一个作为整个***的混叠带宽BInv。
可选地,所述根据每个小区的导频序列生成时域数据的步骤具体包括:将所述导频序列前或后或前后各插0值,生成长度为Nsubcarrier的序列,其中Nsubcarrier为所述混叠带宽BInv包括的子载波个数;对所述长度为Nsubcarrier的序列做正负频交换并在中间插0值,生成NFFT点频域数据;对所述NFFT点频域数据进行反快速傅里叶变换IFFT操作,生成NFFT点时域数据。
可选地,当一个小区的带宽等于2n*BInv时,设置2n个所述导频序列,对应生成2n个所述NFFT点时域数据,然后将生成的2n个NFFT点时域数据进行合并,再对合并后的数据加上Ncp点CP,其中n为非负整数。
可选地,所述特定数据为(Ncp+2n*NFFT)点数据,所述解析所述特定数据,得到其他每个小区在混叠带宽处对应的频域数据的步骤具体包括:对所述特定数据去掉Ncp点CP;取混叠带宽对应的NFFT点时域数据;对所述NFFT点时域数据进行快速傅里叶变换FFT操作,得到NFFT点频域数据Yinv。
可选地,所述根据本地生成的频域数据和解析出的频域数据生成对应的时域数据的步骤具体包括:将本地生成的频域数据和解析出的频域数据进行共轭点乘操作,得到R;对R进行IFFT操作得到NFFT点的时域数据Rt。
可选地,所述根据得到的时域数据确定干扰源小区的步骤具体包括:对其他每个小区对应的时域数据Rt进行峰值搜索,若Rt出现明显峰值,则对应的其他小区为所述干扰源小区。
本发明实施例还提出一种干扰源小区定位装置,该装置包括:接收模块,用于接收其他小区发射的根据导频序列生成的特定数据;解析模块,用于解析所述特定数据,得到其他每个小区在混叠带宽处对应的频域数据;生成模块,用于在本地根据所述***中所有可能的特殊导频序列生成对应的频域数据,以及根据本地生成的频域数据和解析出的频域数据生成对应的时域数据;确定模块,用于根据得到的时域数据确定干扰源小区。
可选地,所述生成模块还用于根据每个小区的导频序列生成时域数据,并将每个小区生成的时域数据加上循环前缀CP后生成所述特定数据;该装置还包括发射模块,用于将生成的特定数据发射至其他小区。
可选地,该装置还包括:设置模块,用于设置整个***的混叠带宽BInv,并以所述混叠带宽BInv为基本单位,设置所述***中每个小区的导频序列。
可选地,所述生成模块根据每个小区的导频序列生成时域数据的过程具体包括:将所述导频序列前或后或前后各插0值,生成长度为Nsubcarrier的序列,其中Nsubcarrier为所述混叠带宽BInv包括的子载波个数;对所述长度为Nsubcarrier的序列做正负频交换并在中间插0值,生成NFFT点频域数据;对所述NFFT点频域数据进行反快速傅里叶变换IFFT操作,生成NFFT点时域数据。
可选地,所述生成模块根据本地生成的频域数据和解析出的频域数据生成对应的时域数据的过程具体包括:将所述本地生成的频域数据和解析出的频域数据进行共轭点乘操作,得到R;对R进行IFFT操作得到NFFT点的时域数据Rt。
本发明实施例还提出一种基站,包括基带处理单元,所述基带处理单元用于执行如下操作:接收其他小区发射的根据导频序列生成的特定数据;解析所述特定数据,得到其他每个小区在混叠带宽处对应的频域数据;在本地根据所述***中所有可能的特殊导频序列生成对应的频域数据;根据本地生成的频域数据和解析出的频域数据生成对应的时域数据;及根据得到的时域数据确定干扰源小区。
可选地,所述基带处理单元还用于:根据每个小区的导频序列生成时域数据;将每个小区生成的时域数据加上循环前缀CP后生成所述特定数据,并发射出去。
可选地,所述基带处理单元还用于:设置整个***的混叠带宽BInv;以所述混叠带宽BInv为基本单位,设置所述***中每个小区的导频序列。
本发明实施例提出的干扰源小区定位方法和装置以及对应的基站,在该***存在多种不同带宽的混叠时,不需要遍历检测各种带宽组合,只需要在混叠带宽处检测相关可能的序列,即可完成对干扰源小区的检测定位,从而降低了定位干扰源小区的复杂度,检测定位的过程简单高效。
图1为本发明提出的一种干扰源小区定位方法的较佳实施例的流程图;
图2为本发明中的TD-LTE***的一种实施例的各个小区的带宽示意图;
图3为图2中的第一干扰小区和第二干扰小区生成特定数据的过程的较佳实施例的流程图;
图4为图2中的第三干扰小区生成特定数据的过程的较佳实施例的流程图;
图5为图2中的目标小区定位干扰源小区的过程的较佳实施例的流程图;
图6本发明提出的一种干扰源小区定位装置的较佳实施例的模块示意图;
本发明目的的实现、功能特点及优点将结合实施例,参照附图做进一步说明。
为了使本发明所要解决的技术问题、技术方案及有益效果更加清楚、明白,以下结合附图和实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
如图1所示,本发明一实施例提出一种干扰源小区定位方法,应用在TD-LTE***的基站中,用于在目标小区(被干扰小区)受到远端小区的信号干扰时,准确定位干扰源小区。该方法包括以下步骤:
S102,设置整个通讯***的混叠带宽。
具体地,所述通讯***为TD-LTE***。如果在整个通讯***的各个小区中存在多种带宽组合,它们之间存在带宽重叠的部分,每一个重叠的部分即为一个混叠带宽BInv_x。
混叠带宽BInv_x=(2)-N*Bcell_n,其中Bcell_n为该通讯***所有的小区带宽。在同一个通讯***中,混叠带宽可以为一块或者多块。当存在多个混叠带宽BInv_x时,选取其中带宽最小的一个作为整个通讯***的混叠带宽BInv。混叠带宽BInv包括Nsubcarrier个子载波。
例如,参阅图2所示,图中的通讯***由20M和10M带宽的小区组成,目标小区受到三个小区的干扰。其中,目标小区的带宽为20M,第一干扰小区的带宽为20M,第二干扰小区的带宽为20M,第三干扰小区的带宽为10M,该通讯***的混叠带宽BInv为10M。
S104,以所述混叠带宽为基本单位,设置该通讯***中每个小区的导频序列。
具体地,将该通讯***中的每个小区的带宽以混叠带宽BInv为基本单位分为若干部分,针对每一个部分对应的频域数据生成导频序列。该导频序列可以是m序列、gold序列、ZC序列,或其他自相关性很好,互相关性不好的序列。所述导频序列的长度小于Nsubcarrier,记为NSequence。
例如,图2中的第一干扰小区(或第二干扰小区)的带宽等于两个混叠带宽BInv,则该第一干扰小区(或第二干扰小区)需要设置两个导频序列NSequence。
S106,根据每个小区的导频序列生成时域数据。
在本实施例中,将导频序列NSequence前或后或前后各插0值,生成长度为
Nsubcarrier的序列,然后做正负频交换并在中间插0值,生成NFFT点频域数据,再对NFFT点频域数据进行IFFT(Inverse Fast Fourier Transform,反快速傅里叶变换)操作,生成NFFT点时域数据。
S108,将每个小区生成的时域数据加上CP(Cyclic Prefix,循环前缀)后生成特定数据,并发射出去。
具体地,当某一个小区的带宽等于2n*BInv时(n=0,1,2,3…..),设置2n个导频序列NSequence,对应生成2n个NFFT点时域数据,然后将生成的2n个NFFT点时域数据进行合并,再对合并后的数据加上Ncp点CP。其中,当n=0即该小区的带宽等于混叠带宽BInv时,设置一个导频序列NSequence,对应生成NFFT点时域数据,然后直接将生成的NFFT点时域数据加上Ncp点CP。
例如,参阅图3和图4所示,为图2中的第一干扰小区(或第二干扰小区)与第三干扰小区生成所述特定数据的过程(即上述步骤S104-S108)对应的一种流程图。
值得注意的是,具体如何由每一个混叠带宽BInv对应的频域数据生成时域数据可能有多种方式,本实施例只给出其中的一种。本领域技术人员可以考虑到的其他方式同样适用于本发明。
进一步地,当目标小区受到干扰时,可以执行下列步骤来定位干扰源小区:
S110,接收其他小区发射的特定数据。
具体地,目标小区接收其他每个小区发射的所述特定数据,所述特定数据为(Ncp+2n*NFFT)点数据。
S112,解析接收到的特定数据,得到其他每个小区在混叠带宽处对应的频域数据。
具体地,针对其他每个小区发射的所述特定数据,先对该特定数据去掉Ncp点CP,取混叠带宽对应的NFFT点时域数据。然后对该NFFT点时域数据进行FFT(Fast Fourier Transform,快速傅里叶变换)操作,得到NFFT点频域数据Yinv。
S114,在本地根据该通讯***中所有可能的特殊导频序列生成对应的频域数据。
具体地,目标小区在本地将该通讯***中所有可能的长度为NSequence的特殊导频序列按照与上述步骤S106相同的方式生成频域数据S。
S116,将本地生成的频域数据和解析出的频域数据进行共轭点乘操作和IFFT操作,得到对应的时域数据。
具体地,目标小区将本地生成的频域数据S和解析出的频域数据Yinv进行共轭点乘操作,得到R,即R=S*.*Yinv。然后对R进行NFFT点IFFT操作得到NFFT点的时域数据Rt。针对其他每个小区,都将得到一个对应的时域数据Rt。
S118,根据得到的时域数据确定干扰源小区。
具体地,对其他每个小区对应的时域数据Rt进行峰值搜索,如果本地的导频序列和发射端(其他小区)的导频序列是相同的,那么Rt会有一个很明显的峰值,表示该其他小区就是干扰源小区,接收端(目标小区)以此就可以确定干扰源小区的信息。
例如,参阅图5所示,为图2中的目标小区定位干扰源小区的过程(即上述步骤S110-S118)对应的一种流程图。
所述干扰源小区定位方法,实施干扰的小区在特定的时域和频域资源,发射根据特定的导频序列生成的特定数据,目标小区在特定的时域和频域资源去检测该特定数据,每个小区所发射的自该特定数据对通讯***中其他所有小区都是已知的。在该通讯***存在多种不同带宽的混叠时,不需要遍历检测各种带宽组合,只需要在混叠带宽处检测相关可能的序列,即可完成对干扰源小区的检测定位。该方法降低了定位干扰源小区的复杂度,检测定位的过程简单高效。
如图6所示,本发明一实施例提出一种干扰源小区定位装置600,应用在TD-LTE***的基站的基带处理单元中,用于在目标小区受到远端小区的信号干扰时,准确定位干扰源小区。
在本实施例中,干扰源小区定位装置600包括设置模块602,生成模块604,发射模块606、接收模块608、解析模块610及确定模块612。
所述设置模块602,用于设置整个通讯***的混叠带宽。
具体地,所述通讯***为TD-LTE***。如果在整个通讯***的各个小区中存在多种带宽组合,它们之间存在带宽重叠的部分,每一个重叠的部分即为一个混叠带宽BInv_x。
混叠带宽BInv_x=(2)-N*Bcell_n,其中Bcell_n为该通讯***所有的小区带宽。在同一个通讯***中,混叠带宽可以为一块或者多块。当存在多个混叠带宽BInv_x时,选取其中带宽最小的一个作为整个通讯***的混叠带宽BInv。混叠带宽BInv包括Nsubcarrier个子载波。
所述设置模块602还用于以所述混叠带宽为基本单位,设置该通讯***中每个小区的导频序列。
具体地,将该通讯***中的每个小区的带宽以混叠带宽BInv为基本单位分为若干部分,针对每一个部分对应的频域数据生成导频序列。该导频序列可以是m序列、gold序列、ZC序列,或其他自相关性很好,互相关性不好的序列。所述导频序列的长度小于Nsubcarrier,记为NSequence。
所述生成模块604,用于根据每个小区的导频序列生成时域数据。
在本实施例中,将导频序列NSequence前或后或前后各插0值,生成长度为Nsubcarrier的序列,然后做正负频交换并在中间插0值,生成NFFT点频域数据,再对NFFT点频域数据进行IFFT(Inverse Fast Fourier Transform,反快速傅里叶变换)操作,生成NFFT点时域数据。
所述生成模块604还用于将每个小区生成的时域数据加上CP(Cyclic Prefix,循环前缀)后生成特定数据。
具体地,当某一个小区的带宽等于2n*BInv时(n=0,1,2,3…..),设置2n个导频序列NSequence,对应生成2n个NFFT点时域数据,然后将生成的2n个NFFT点时域数据进行合并,再对合并后的数据加上Ncp点CP。其中,当n=0即该小区的带宽等于
混叠带宽BInv时,设置一个导频序列NSequence,对应生成NFFT点时域数据,然后直接将生成的NFFT点时域数据加上Ncp点CP。
所述发射模块606,用于将所述特定数据发射至其他小区。
所述接收模块608,用于接收其他小区发射的特定数据。
具体地,目标小区接收其他每个小区发射的所述特定数据,所述特定数据为(Ncp+2n*NFFT)点数据。
所述解析模块610,用于解析接收到的特定数据,得到其他每个小区在混叠带宽处对应的频域数据。
具体地,针对其他每个小区发射的所述特定数据,先对该特定数据去掉Ncp点CP,取混叠带宽对应的NFFT点时域数据。然后对该NFFT点时域数据进行FFT(Fast Fourier Transform,快速傅里叶变换)操作,得到NFFT点频域数据Yinv。
所述生成模块604还用于在本地根据该通讯***中所有可能的特殊导频序列生成对应的频域数据。
具体地,目标小区在本地将该通讯***中所有可能的长度为NSequence的特殊导频序列按照与发射端相同的方式生成频域数据S。
所述生成模块604还用于将本地生成的频域数据和解析出的频域数据进行共轭点乘操作和IFFT操作,得到对应的时域数据。
具体地,目标小区将本地生成的频域数据S和解析出的频域数据Yinv进行共轭点乘操作,得到R,即R=S*.*Yinv。然后对R进行NFFT点IFFT操作得到NFFT点的时域数据Rt。针对其他每个小区,都将得到一个对应的时域数据Rt。
所述确定模块612,用于根据得到的时域数据确定干扰源小区。
具体地,对其他每个小区对应的时域数据Rt进行峰值搜索,如果本地的导频序列和发射端(其他小区)的导频序列是相同的,那么Rt会有一个很明显的峰值,表示该其他小区就是干扰源小区,接收端(目标小区)以此就可以确定干扰源小区的信息。
值得注意的是,所述干扰源小区定位装置600可以应用在该TD-LTE***的每个小区(基站)的基带处理单元中,通过执行所述模块602-606的功能向其他小区发送特定数据。当一个小区受到干扰时(即为目标小区),该小区中的干扰源小区定位装置600通过执行所述模块608-612的功能找到干扰源小区。
需要说明的是,在本文中,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现,当然也可以通过硬件来实现,但很多情况下前者是更佳的实施方式。基于这样的理解,本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中,包括若干指令用以使得一台终端设备(可以是手机,计算机,服务器,空调器,或者网络设备等)执行本发明各个实施例所述的方法。
以上参照附图说明了本发明的优选实施例,并非因此局限本发明的权利范围。上述本发明实施例序号仅仅为了描述,不代表实施例的优劣。另外,虽然在流程图中示出了逻辑顺序,但是在某些情况下,可以以不同于此处的顺序执行所示出或描述的步骤。
本领域技术人员不脱离本发明的范围和实质,可以有多种变型方案实现本发明,比如作为一个实施例的特征可用于另一实施例而得到又一实施例。凡在运用本发明的技术构思之内所作的任何修改、等同替换和改进,均应在本发明的权利范围之内。
本发明实施例提供的技术方案可以应用于通讯技术领域。在本发明实施例提供的干扰源小区定位方法和装置以及对应的基站,在该***存在多种不同带宽的混叠时,不需要遍历检测各种带宽组合,只需要在混叠带宽处检测相关可能的序列,即可完成
对干扰源小区的检测定位,从而降低了定位干扰源小区的复杂度,检测定位的过程简单高效。
Claims (17)
- 一种干扰源小区定位方法,该方法包括步骤:接收其他小区发射的根据导频序列生成的特定数据;解析所述特定数据,得到其他每个小区在混叠带宽处对应的频域数据;在本地根据所述***中所有可能的特殊导频序列生成对应的频域数据;根据本地生成的频域数据和解析出的频域数据生成对应的时域数据;及根据得到的时域数据确定干扰源小区。
- 根据权利要求1所述的干扰源小区定位方法,其中,该方法在所述接收其他小区发射的根据导频序列生成的特定数据的步骤之前还包括步骤:根据每个小区的导频序列生成时域数据;将每个小区生成的时域数据加上循环前缀CP后生成所述特定数据,并发射出去。
- 根据权利要求2所述的干扰源小区定位方法,其中,该方法在所述根据每个小区的导频序列生成时域数据的步骤之前还包括步骤:设置整个***的混叠带宽BInv;以所述混叠带宽BInv为基本单位,设置所述***中每个小区的导频序列。
- 根据权利要求3所述的干扰源小区定位方法,其中,当所述***中存在多个混叠带宽时,选取其中带宽最小的一个作为整个***的混叠带宽BInv。
- 根据权利要求3所述的干扰源小区定位方法,其中,所述根据每个小区的导频序列生成时域数据的步骤具体包括:将所述导频序列前或后或前后各插0值,生成长度为Nsubcarrier的序列,其中Nsubcarrier为所述混叠带宽BInv包括的子载波个数;对所述长度为Nsubcarrier的序列做正负频交换并在中间插0值,生成NFFT点频域数据;对所述NFFT点频域数据进行反快速傅里叶变换IFFT操作,生成NFFT点时域数 据。
- 根据权利要求5所述的干扰源小区定位方法,其中,当一个小区的带宽等于2n*BInv时,设置2n个所述导频序列,对应生成2n个所述NFFT点时域数据,然后将生成的2n个NFFT点时域数据进行合并,再对合并后的数据加上Ncp点CP,其中n为非负整数。
- 根据权利要求6所述的干扰源小区定位方法,其中,所述特定数据为(Ncp+2n*NFFT)点数据,所述解析所述特定数据,得到其他每个小区在混叠带宽处对应的频域数据的步骤具体包括:对所述特定数据去掉Ncp点CP;取混叠带宽对应的NFFT点时域数据;对所述NFFT点时域数据进行快速傅里叶变换FFT操作,得到NFFT点频域数据Yinv。
- 根据权利要求1所述的干扰源小区定位方法,其中,所述根据本地生成的频域数据和解析出的频域数据生成对应的时域数据的步骤具体包括:将本地生成的频域数据和解析出的频域数据进行共轭点乘操作,得到R;对R进行IFFT操作得到NFFT点的时域数据Rt。
- 根据权利要求8所述的干扰源小区定位方法,其中,所述根据得到的时域数据确定干扰源小区的步骤具体包括:对其他每个小区对应的时域数据Rt进行峰值搜索,若Rt出现明显峰值,则对应的其他小区为所述干扰源小区。
- 一种干扰源小区定位装置,应用于基站的基带处理单元,其中,该装置包括:接收模块,设置为接收其他小区发射的根据导频序列生成的特定数据;解析模块,设置为解析所述特定数据,得到其他每个小区在混叠带宽处对应的频域数据;生成模块,设置为在本地根据所述***中所有可能的特殊导频序列生成对应的频域数据,以及根据本地生成的频域数据和解析出的频域数据生成对应的时域数据;确定模块,设置为根据得到的时域数据确定干扰源小区。
- 根据权利要求10所述的干扰源小区定位装置,其中:所述生成模块还用于根据每个小区的导频序列生成时域数据,并将每个小区生成的时域数据加上循环前缀CP后生成所述特定数据;该装置还包括发射模块,设置为将生成的特定数据发射至其他小区。
- 根据权利要求11所述的干扰源小区定位装置,其中,该装置还包括:设置模块,设置为设置整个***的混叠带宽BInv,并以所述混叠带宽BInv为基本单位,设置所述***中每个小区的导频序列。
- 根据权利要求12所述的干扰源小区定位装置,其中,所述生成模块根据每个小区的导频序列生成时域数据的过程具体包括:将所述导频序列前或后或前后各插0值,生成长度为Nsubcarrier的序列,其中Nsubcarrier为所述混叠带宽BInv包括的子载波个数;对所述长度为Nsubcarrier的序列做正负频交换并在中间插0值,生成NFFT点频域数据;对所述NFFT点频域数据进行反快速傅里叶变换IFFT操作,生成NFFT点时域数据。
- 根据权利要求10所述的干扰源小区定位装置,其中,所述生成模块根据本地生成的频域数据和解析出的频域数据生成对应的时域数据的过程包括:将所述本地生成的频域数据和解析出的频域数据进行共轭点乘操作,得到R;对R进行IFFT操作得到NFFT点的时域数据Rt。
- 一种基站,包括基带处理单元,其中,所述基带处理单元设置为执行如下操作:接收其他小区发射的根据导频序列生成的特定数据;解析所述特定数据,得到其他每个小区在混叠带宽处对应的频域数据;在本地根据所述***中所有可能的特殊导频序列生成对应的频域数据;根据本地生成的频域数据和解析出的频域数据生成对应的时域数据;及根据得到的时域数据确定干扰源小区。
- 根据权利要求15所述的基站,其中,所述基带处理单元还设置为:根据每个小区的导频序列生成时域数据;将每个小区生成的时域数据加上循环前缀CP后生成所述特定数据,并发射出去。
- 根据权利要求16所述的基站,其中,所述基带处理单元还设置为:设置整个***的混叠带宽BInv;以所述混叠带宽BInv为基本单位,设置所述***中每个小区的导频序列。
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