Bandwidth detection method and device of LTE system, equipment and storage medium

Abstract

The embodiment of the invention provides a bandwidth detection method and device of an LTE system, equipment and a storage medium. The method comprises the following steps: generating a first CRS signal of each position in a plurality of CRS symbol positions of an antenna port 0 in a subframe of each bandwidth of LTE according to a 3GPP specification; obtaining a second CRS signal of each position in the plurality of CRS symbol positions of the received LTE signal in a subframe from a frequency domain according to each bandwidth; and obtaining the actual bandwidth of the LTE system according to a correlation result of the second CRS signal and the first CRS signal at each position in the plurality of CRS symbol positions of each bandwidth. According to the technical scheme of the embodiment of the invention, before PBCH decoding, the corresponding CRS signal is obtained from the frequency domain according to the assumed LTE bandwidth, and the actual bandwidth of the LTE system is obtained according to the CRS signal pair correlation result of the 3GPP standard, so that the actual CRS signal of the LTE signal is obtained, and the PBCH receiving performance is improved based on the channel estimation of the CRS signal.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a bandwidth detection method, device, equipment and storage medium for an LTE system. Background Art

[0002] In the existing LTE technology, a bit stream after PBCH decoding is obtained in the network search phase, and the bit stream is parsed to obtain the downlink bandwidth.

[0003] However, when decoding the PBCH, channel estimation is performed based on the PSS / SSS. Inaccurate channel estimation leads to inaccurate PBCH decoding, which sometimes makes it impossible to obtain the LTE bandwidth. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a bandwidth detection method, apparatus, device and storage medium for an LTE system. The technical solution of the embodiments of the present application obtains the corresponding CRS signal from the frequency domain according to the assumed LTE bandwidth before PBCH decoding, and obtains the actual bandwidth of the LTE system by the correlation result of the CRS signal according to the 3GPP specification, thereby obtaining the actual CRS signal of the LTE system, so as to improve the PBCH reception performance based on the channel estimation of the CRS signal.

[0005] In the first aspect, an embodiment of the present application provides a bandwidth detection method for an LTE system, including: generating a first CRS signal for each of several CRS symbol positions at antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification, wherein each of the several CRS symbol positions has the same position in each RB; obtaining a second CRS signal for each of the several CRS symbol positions in a subframe of a received LTE signal from the frequency domain according to each of the bandwidths; and obtaining the actual bandwidth of the LTE system based on the correlation results of the second CRS signal and the first CRS signal at each of the several CRS symbol positions of each of the bandwidths.

[0006] From the above, before PBCH decoding, the corresponding second CRS signal is obtained from the frequency domain according to the assumed LTE bandwidth and the correlation result of the first CRS signal according to the 3GPP specification is used to obtain the actual bandwidth of the LTE system, which is used to obtain the actual CRS signal of the LTE signal, so as to improve the PBCH reception performance based on the channel estimation of the CRS signal.

[0007] In a possible implementation manner of the first aspect, the actual bandwidth of the LTE system is obtained according to the correlation results of the second CRS signal and the first CRS signal at each of the several CRS symbol positions of each of the bandwidths, including: obtaining the correlation results of the second CRS signal and the first CRS signal at each of the several CRS symbol positions of each of the bandwidths; averaging the correlation results of each of the bandwidths based on the number of RBs in the LTE system of the bandwidth, and obtaining the modulus of each of the mean values; and taking the LTE bandwidth corresponding to the maximum value in the modulus of each mean value as the actual bandwidth of the LTE system.

[0008] From the above, according to the correlation results of the second CRS signal and the first CRS signal at each position of several CRS symbol positions corresponding to each assumed bandwidth, the modulus of the mean of the number of RBs in the LTE system based on the bandwidth is calculated, and the LTE bandwidth corresponding to the maximum value in the modulus of each mean is taken as the actual band of the LTE system, thereby accurately obtaining the bandwidth of the LTE system without parsing the PBCH stream.

[0009] In a possible implementation manner of the first aspect, a correlation result of each second CRS signal and the corresponding first CRS signal is a dot product between a sequence of the second CRS signal and a conjugate sequence of the first CRS signal.

[0010] As described above, the correlation result between each second CRS signal sequence and the corresponding conjugate sequence of the first CRS signal is obtained by the dot product between them, so that the modulus of the mean obtained according to the correlation result can be used to determine the actual bandwidth of the LTE system.

[0011] In a possible implementation of the first aspect, the first CRS signal for each of several CRS symbol positions of antenna port 0 in a subframe of each bandwidth of LTE is generated according to the 3GPP specification, including: obtaining the first CRS signal according to the assumed bandwidth of the LTE system, the cell ID and CP type of the LTE signal, wherein the cell ID and CP type of the LTE signal are obtained in advance.

[0012] As described above, the cell ID and CP type of the LTE signal obtained in advance and the assumed LTE bandwidth are used to determine the CRS symbol position and generate the first CRS signal.

[0013] In a possible implementation manner of the first aspect, the method of obtaining from the frequency domain a second CRS signal at each of the several CRS symbol positions in a subframe of a received LTE signal according to each of the bandwidths includes: obtaining the second CRS signal in the frequency domain according to an assumed bandwidth of the LTE system and a center frequency of the LTE cell, wherein the center frequency is obtained in advance.

[0014] As described above, the subcarriers at the CRS symbol positions are determined using the center frequency obtained in advance and the assumed LTE bandwidth to obtain the second CRS signal.

[0015] In a possible implementation of the first aspect, it also includes: obtaining a third CRS signal of the LTE signal based on the obtained bandwidth of the LTE system combined with the cell ID and CP type of the LTE signal, wherein the third CRS signal is the actual CRS signal at each antenna port in a subframe of the LTE signal.

[0016] As described above, the actual CRS signal of the LTE signal is obtained by using the obtained bandwidth of the LTE system, so as to be used for channel estimation.

[0017] In a possible implementation manner of the first aspect, it further includes: before performing PBCH decoding, performing channel estimation on the LTE signal according to the third CRS signal.

[0018] From the above, before PBCH decoding, compared with channel estimation using PSS / SSS, channel estimation using the actual CRS signal of the LTE signal obtained by using the bandwidth of the LTE system is more accurate, thereby improving the reception performance of the PBCH.

[0019] In the second aspect, an embodiment of the present application provides a bandwidth detection device for an LTE system, including: a first symbol module, used to generate a first CRS signal for each of several CRS symbol positions at antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification, wherein each of the several CRS symbol positions has the same position in each RB; a second symbol module, used to obtain a second CRS signal for each of the several CRS symbol positions in a subframe of a received LTE signal from the frequency domain according to each of the bandwidths; a bandwidth acquisition module, used to obtain the actual bandwidth of the LTE system based on the correlation results of the second CRS signal and the first CRS signal at each of the several CRS symbol positions of each of the bandwidths.

[0020] From the above, before PBCH decoding, the corresponding second CRS signal is obtained from the frequency domain according to the assumed LTE bandwidth and the correlation result of the first CRS signal according to the 3GPP specification is used to obtain the actual bandwidth of the LTE system, which is used to obtain the actual CRS signal of the LTE signal, so as to improve the PBCH reception performance based on the channel estimation of the CRS signal.

[0021] In a possible implementation manner of the second aspect, the bandwidth acquisition module is specifically used to include: obtaining the correlation result of the second CRS signal and the first CRS signal at each of the several CRS symbol positions of each of the bandwidths; averaging the correlation results of each of the bandwidths based on the number of RBs in the LTE system of the bandwidth, and obtaining the modulus of each of the averages; and taking the LTE bandwidth corresponding to the maximum value in the modulus of each of the averages as the actual bandwidth of the LTE system.

[0022] From the above, according to the correlation results of the second CRS signal and the first CRS signal at each position of several CRS symbol positions corresponding to each assumed bandwidth, the modulus of the mean of the number of RBs in the LTE system based on the bandwidth is calculated, and the LTE bandwidth corresponding to the maximum value in the modulus of each mean is taken as the actual band of the LTE system, thereby accurately obtaining the bandwidth of the LTE system without parsing the PBCH stream.

[0023] In a possible implementation manner of the second aspect, a correlation result of each second CRS signal and the corresponding first CRS signal is a dot product between a sequence of the second CRS signal and a conjugate sequence of the first CRS signal.

[0024] As described above, the correlation result between each second CRS signal sequence and the corresponding conjugate sequence of the first CRS signal is obtained by the dot product between them, so that the modulus of the mean obtained according to the correlation result can be used to determine the actual bandwidth of the LTE system.

[0025] In a possible implementation manner of the second aspect, the first symbol module is specifically used to obtain the first CRS signal according to the assumed bandwidth of the LTE system, the cell ID and CP type of the LTE signal, wherein the cell ID and CP type of the LTE signal are obtained in advance.

[0026] As described above, the cell ID and CP type of the LTE signal obtained in advance and the assumed LTE bandwidth are used to determine the CRS symbol position and generate the first CRS signal.

[0027] In a possible implementation manner of the second aspect, the second symbol module is specifically used to obtain the second CRS signal in the frequency domain according to an assumed bandwidth of the LTE system and a center frequency of the LTE cell, wherein the center frequency is obtained in advance.

[0028] As described above, the subcarriers at the CRS symbol positions are determined using the center frequency obtained in advance and the assumed LTE bandwidth to obtain the second CRS signal.

[0029] In a possible implementation of the second aspect, it also includes: a third symbol module, used to obtain a third CRS signal of the LTE signal based on the obtained bandwidth of the LTE system combined with the cell ID and CP type of the LTE signal, wherein the third CRS signal is the actual CRS signal at each antenna port in a subframe of the LTE signal.

[0030] As described above, the actual CRS signal of the LTE signal is obtained by using the obtained bandwidth of the LTE system, so as to be used for channel estimation.

[0031] In a possible implementation manner of the second aspect, it further includes: a channel estimation module, configured to perform channel estimation on the LTE signal according to the third CRS signal before performing PBCH decoding.

[0032] From the above, before PBCH decoding, compared with channel estimation using PSS / SSS, channel estimation using the actual CRS signal of the LTE signal obtained by using the bandwidth of the LTE system is more accurate, thereby improving the reception performance of the PBCH.

[0033] In a third aspect, an embodiment of the present application provides a computing device, including:

[0034] bus;

[0035] A communication interface connected to the bus;

[0036] at least one processor connected to the bus; and

[0037] At least one memory is connected to the bus and stores program instructions, and when the program instructions are executed by the at least one processor, the at least one processor executes any implementation method of the first aspect of the present application.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having program instructions stored thereon, wherein when the program instructions are executed by a computer, the computer executes any implementation method described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a flow chart of a first embodiment of a bandwidth detection method for an LTE system of the present application;

[0040] Figure 2This is a flow chart of Embodiment 2 of a bandwidth detection method for an LTE system of the present application;

[0041] Figure 3 This is a structural diagram of a first embodiment of a bandwidth detection device for an LTE system of the present application;

[0042] Figure 4 This is a structural diagram of Embodiment 2 of a bandwidth detection device for an LTE system of the present application;

[0043] Figure 5 A schematic diagram of the structure of a computing device according to various embodiments of the present application. DETAILED DESCRIPTION

[0044] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0045] In the following description, the terms "first\second\third, etc." or module A, module B, module C, etc. are only used to distinguish similar objects, or to distinguish different embodiments, and do not represent a specific ordering of the objects. It can be understood that the specific order or sequence can be interchanged where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0046] In the following description, the numbers representing the steps, such as S110, S120, etc., do not necessarily mean that the steps must be executed in this manner. If permitted, the order of the previous and next steps can be interchanged, or they can be executed simultaneously.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0048] An embodiment of the present application provides a bandwidth detection method, apparatus, device and storage medium for an LTE system, the method comprising: generating a first CRS signal for each of a number of CRS symbol positions at antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification, wherein each of the number of CRS symbol positions has the same position in each RB; obtaining a second CRS signal for each of the number of CRS symbol positions in a subframe of a received LTE signal from the frequency domain according to each of the bandwidths; and obtaining the actual bandwidth of the LTE system according to the correlation results of the second CRS signal and the first CRS signal at each of the number of CRS symbol positions of each of the bandwidths.

[0049] The technical solution of the embodiment of the present application obtains the corresponding CRS signal from the frequency domain according to the assumed LTE bandwidth before PBCH decoding, and obtains the actual bandwidth of the LTE system by correlating the result with the CRS signal according to the 3GPP specification, thereby obtaining the actual CRS signal of the LTE signal, so as to improve the PBCH reception performance by utilizing the channel estimation based on the CRS signal.

[0050] The following describes various embodiments of the present application in conjunction with the accompanying drawings. First, the frame structure of LTE involved in the present application is introduced.

[0051] The LTE wireless frame is 10ms long and is divided into 10 subframes, namely subframe 0 to subframe 9. Each subframe includes 2 time slots. Each subframe is 1ms long and each time slot is 0.5ms long. Each time slot transmits several symbols on each antenna port.

[0052] In order to enhance LTE's resistance to multipath interference, the data transmitted in each time slot of LTE is added with CP (cyclic prefix) by symbol. The CP types of LTE include NCP (for cells with normal coverage) and ECP (for cells with long-distance coverage). Each time slot corresponding to NCP includes 7 symbols, and each time slot corresponding to ECP includes 6 symbols.

[0053] To facilitate scheduling, LTE calls each time slot resource of each subcarrier RE, and each 12 carriers form an RB, which is scheduled in units of RB. To facilitate the terminal to detect downlink signals, some REs are selected on each RB of each subframe, and some symbol resources are selected from these REs to send CRS signals (cell reference signals). The symbol position of the CRS signal is related to the antenna port, the Cell ID of the LTE cell, the CP type, etc. The sequence of each CRS signal is related to the bandwidth of the LTE cell, the CP type, the Cell ID and the symbol position, etc.

[0054] Combine the following Figure 1The present application introduces a first embodiment of a bandwidth detection method for an LTE system.

[0055] Figure 1 The flowchart of Embodiment 1 of a bandwidth detection method for an LTE system is shown, which is used after cell synchronization and before PBCH decoding, and includes steps S110 to S130.

[0056] S110: Generate a first CRS signal at each of several CRS symbol positions of antenna port 0 in a subframe of each bandwidth of LTE according to 3GPP specifications.

[0057] Among them, each of the several CRS symbol positions has the same position in each RB, and each of the several CRS symbol positions corresponds to a first CRS signal. The symbol position of each CRS symbol is related to the antenna port, the CellID and CP type of the LTE cell, etc. In each embodiment of the present application, only the CRS signal corresponding to antenna port 0 is used, and the CellID and CP type of the LTE cell are obtained in advance.

[0058] According to the 3GPP specification, in the RE position of antenna port 0 of each RB of each subframe, there are 4 CRS symbol positions for sending CRS symbols, and each CRS symbol position is mapped to 2 subcarriers. In some embodiments, the several CRS symbol positions are selected from the four CRS symbol positions; in other embodiments, all the four CRS symbol positions are selected as the several CRS symbol positions.

[0059] Among them, in the 3GPP specification, the sequence of the CRS signal of LTE is generated by the Gold sequence, and the Gold sequence is related to the Cell ID, CP type, CRS symbol position, etc. of the LTE cell. The CRS signals of LTE cells with different bandwidths have different positions in the Gold sequence. In some embodiments, for each bandwidth of LTE (essentially each assumed bandwidth, the same below), the cell ID and CP type of the LTE cell acquired in advance and the selected CRS symbol position are used to obtain the first CRS signal corresponding to each of the selected CRS symbol positions according to the 3GPP specification.

[0060] S120: Obtain, from the frequency domain according to each bandwidth of LTE, a second CRS signal in which the plurality of CRS symbol positions in a subframe of the received LTE signal are located at antenna port 0.

[0061] Here, the frequency domain refers to the frequency of the subcarrier. For each assumed bandwidth of LTE, the frequency of the subcarrier at each of the several CRS symbol positions is first obtained using the center frequency of the LTE cell obtained in advance; and the corresponding second CRS signal is obtained in the frequency domain from the frequency of the subcarrier at each of the several CRS symbol positions for each bandwidth of LTE.

[0062] S130: Obtain an actual bandwidth of the LTE system according to a correlation result between the second CRS signal and the first CRS signal at each of the plurality of CRS symbol positions of each bandwidth of the LTE.

[0063] In some embodiments, for each assumed bandwidth of LTE, the correlation result of the second CRS signal and the first CRS signal at each of the several CRS symbol positions of the bandwidth is first obtained; then each correlation result is averaged based on the number of RBs in the LTE system of the bandwidth, and the modulus of the average is calculated; then the LTE bandwidth corresponding to the maximum value of the modulus of each mean is used as the actual bandwidth of the LTE system. The preferred calculation method of the correlation result of each second CRS signal and the corresponding first CRS signal is to obtain it by the dot product between the sequence of the second CRS signal and the conjugate sequence of the first CRS signal.

[0064] In some embodiments, after the actual bandwidth of the LTE system is obtained, the actual CRS signal of the LTE signal is obtained according to the obtained bandwidth of the LTE system and in combination with the cell ID and CP type of the LTE signal obtained in advance.

[0065] In some embodiments, after obtaining the actual CRS signal of the LTE signal, channel estimation is performed on the LTE signal based on the obtained third CRS signal, which is used for PBCH decoding to improve the decoding performance of the PBCH.

[0066] In summary, a bandwidth detection method for an LTE system in embodiment 1 is used to obtain the corresponding CRS signal from the frequency domain according to the assumed LTE bandwidth and the CRS signal according to the 3GPP specification, and then obtain the actual bandwidth of the LTE system by correlating the result after LTE cell synchronization and before PBCH decoding, thereby obtaining the actual CRS signal of the LTE signal, so as to improve the PBCH reception performance by utilizing channel estimation based on the CRS signal.

[0067] Combine the following Figure 2 A second embodiment of a bandwidth detection method for an LTE system of the present application is introduced.

[0068] Embodiment 2 of a bandwidth detection method for an LTE system inherits all the methods of embodiment 1 of a bandwidth detection method for an LTE system and has all its advantages; at the same time, in order to improve the accuracy of bandwidth detection, the first CRS signal and the second CRS signal are both CRS signals of all RBs at the positions of all CRS symbols carrying antenna port 0 under the assumed LTE bandwidth, and the actual CRS signal is obtained using the obtained LTE bandwidth, thereby performing channel estimation based on the CRS signal.

[0069] Figure 2 The flowchart of Embodiment 2 of a bandwidth detection method for an LTE system is shown, which is also used after cell synchronization and before PBCH decoding, and includes steps S210 to S270.

[0070] S210: Generate a first CRS signal at antenna port 0 for all RBs in a subframe of each bandwidth of LTE carrying CRS symbols according to 3GPP specifications.

[0071] Among them, there are 6 types of LTE bandwidths, including 1.4Mhz, 3Mhz, 5Mhz, 10Mhz, 15Mhz, and 20Mhz, and the corresponding numbers of RBs are 6, 15, 25, 50, 75, and 100 respectively.

[0072] For each LTE bandwidth, the position of each RB carrying the CRS symbol is obtained according to the 3GPP specification using the Cell ID and CP type of the LTE cell obtained in advance, antenna port, etc. There are 4 CRS symbol positions on antenna port 0 in each subframe, and each position corresponds to 2 subcarriers.

[0073] Among them, by obtaining the LTE cell ID, CP type and CRS symbol position in advance, the Gold sequence of the first CRS signal corresponding to each CRS symbol position is generated according to the 3GPP specification; then for each LTE bandwidth, the offset position of each corresponding first CRS signal in the corresponding Gold sequence is obtained according to the LTE bandwidth, and the offset position is in, is the number of RBs corresponding to the bandwidth of LTE, =110; for each LTE bandwidth, the first CRS signal corresponding to each CRS symbol position corresponding to the LTE bandwidth is obtained according to the corresponding offset position and the first CRS signal corresponding to each CRS symbol position in the corresponding Gold sequence.

[0074] For each LTE bandwidth, the first CRS signal carried at the 4 CRS symbol positions of each RB on antenna port 0 is recorded as k is the identifier of the subcarrier carrying the CRS symbol, and n is the identifier of the LTE bandwidth.

[0075] Among them, the 3GPP specifications involved in this step please refer to Chapter 6 of 3GPP specification 36211, which will not be described in detail here.

[0076] S220: Obtain, from the frequency domain according to each bandwidth of LTE, a second CRS signal at all CRS symbol positions of the received LTE system at antenna port 0 in a subframe.

[0077] Among them, according to the assumed LTE bandwidth, the cell center frequency of the LTE signal obtained in advance, and the CRS symbol position of each RB, the frequencies of the subcarriers at the 4 CRS symbol positions of antenna port 0 are determined. For each LTE bandwidth, the 4 second CRS signals of the received LTE signal are obtained from these 4 frequencies, which are recorded as k is the identifier of the subcarrier carrying the CRS symbol, and n is the identifier of the LTE bandwidth.

[0078] S230: Obtain a correlation result between the second CRS signal and the first CRS signal at each CRS symbol position of each bandwidth of LTE.

[0079] The correlation result between each second CRS signal of each bandwidth of LTE and the corresponding first CRS signal is obtained by formula (1). is the correlation result for the first CRS symbol position, is the correlation result for the second CRS symbol position, is the correlation result for the third CRS symbol position, is the correlation result of the fourth CRS symbol position.

[0080]

[0081] S240: averaging the correlation results of each LTE bandwidth based on the number of RBs, and obtaining the modulus of the average of each LTE bandwidth.

[0082] The correlation results of each LTE bandwidth are averaged based on the number of RBs using formula (2), and coorn is the modulus of the average of the correlation results of the LTE system with a bandwidth identifier of n.

[0083]

[0084] S250: Taking the LTE bandwidth corresponding to the maximum value among the moduli of the means as the actual bandwidth of the LTE system.

[0085] For each LTE bandwidth, there is a coorn , coor n The n corresponding to the maximum value is an identifier corresponding to the actual bandwidth of the LTE system.

[0086] S260: Obtain a third CRS signal of the LTE signal by using the obtained bandwidth of the LTE system in combination with the cell ID and CP type of the LTE signal.

[0087] The third CRS signal is each actual CRS signal at each antenna port in a subframe of the LTE signal.

[0088] S270: Perform channel estimation on the LTE signal according to the third CRS signal, and decode the PBCH according to the channel estimation.

[0089] Among them, the existing technologies all perform channel estimation based on the synchronization signal (PSS / SSS) first, then decode the PBCH code stream based on the PSS, and then obtain the LTE bandwidth based on the decoding information of the PBCH code stream, and then obtain the CRS. This embodiment first obtains the CRS signal, then performs channel estimation on the LTE signal, and decodes the PBCH based on the channel estimation, thereby improving the PBCH decoding performance.

[0090] Among them, the present embodiment decodes PBCH according to the channel estimation of CRS, which is more accurate and has better performance than the prior art which decodes PBCH code stream according to the channel estimation of synchronization signal.

[0091] Combine the following Figure 3 A first embodiment of a bandwidth detection device for an LTE system is introduced.

[0092] Embodiment 1 of a bandwidth detection device for an LTE system is used to implement the method of embodiment 1 of a bandwidth detection method for an LTE system, and has all the advantages thereof.

[0093] Figure 3 The structure of a first embodiment of a bandwidth detection device for an LTE system is shown, including: a first symbol module 310 , a second symbol module 320 , and a bandwidth acquisition module 330 .

[0094] The first symbol module 310 is used to generate a first CRS signal at each position of a plurality of CRS symbol positions of antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification. For its working principle and advantages, please refer to step S110 of the first embodiment of a bandwidth detection method for an LTE system.

[0095] The second symbol module 320 is used to obtain, from the frequency domain according to each bandwidth of LTE, a second CRS signal in which the plurality of CRS symbol positions in a subframe of the received LTE signal are located at antenna port 0. For its working principle and advantages, please refer to step S120 of embodiment 1 of a bandwidth detection method for an LTE system.

[0096] The bandwidth acquisition module 330 is used to obtain the actual bandwidth of the LTE system according to the correlation results of the second CRS signal and the first CRS signal at each position of the plurality of CRS symbol positions of each bandwidth of LTE. For its working principle and advantages, please refer to step S130 of embodiment 1 of a bandwidth detection method for an LTE system.

[0097] Combine the following Figure 4 A second embodiment of a bandwidth detection device for an LTE system is introduced.

[0098] Embodiment 2 of a bandwidth detection device for an LTE system is used to implement the method of embodiment 2 of a bandwidth detection method for an LTE system, and has all its advantages.

[0099] Figure 4 The structure of a second embodiment of a bandwidth detection device for an LTE system is shown, including: a first symbol module 410, a second symbol module 420, a correlation acquisition module 430, a bandwidth acquisition module 440, a third symbol module 450, and a channel estimation module 460.

[0100] The first symbol module 410 is used to generate a first CRS signal at each position of a plurality of CRS symbol positions of antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification. For its working principle and advantages, please refer to step S210 of Embodiment 2 of a bandwidth detection method for an LTE system.

[0101] The second symbol module 420 is used to obtain, from the frequency domain according to each bandwidth of LTE, a second CRS signal in which the plurality of CRS symbol positions in a subframe of the received LTE signal are located at antenna port 0. For its working principle and advantages, please refer to step S220 of Embodiment 2 of a bandwidth detection method for an LTE system.

[0102] The correlation acquisition module 430 is used to obtain the correlation result between the second CRS signal and the first CRS signal at each CRS symbol position of each bandwidth of LTE. For its working principle and advantages, please refer to step S230 of Embodiment 2 of a bandwidth detection method for an LTE system.

[0103] The bandwidth acquisition module 440 is used to average the relevant results of each LTE bandwidth based on the number of RBs, and obtain the modulus of the mean of each LTE bandwidth, and use the LTE bandwidth corresponding to the maximum value of the modulus of each mean as the actual bandwidth of the LTE system. For its working principle and advantages, please refer to steps S240 and S250 of embodiment 2 of a bandwidth detection method for an LTE system.

[0104] The third symbol module 450 is used to obtain the third CRS signal of the LTE signal by combining the obtained bandwidth of the LTE system with the cell ID and CP type of the LTE signal. For its working principle and advantages, please refer to step S260 of the second embodiment of a bandwidth detection method for an LTE system.

[0105] The channel estimation module 460 is used to perform channel estimation on the LTE signal according to the third CRS signal, and decode the PBCH according to the channel estimation. For its working principle and advantages, please refer to step S270 of the second embodiment of a bandwidth detection method for an LTE system.

[0106] The present application embodiment also provides a computing device, Figure 5 Detailed introduction.

[0107] The computing device 500 includes a processor 510 , a memory 520 , a communication interface 530 , and a bus 540 .

[0108] It should be understood that the communication interface 530 in the computing device 500 shown in this figure can be used to communicate with other devices.

[0109] The processor 510 may be connected to a memory 520. The memory 520 may be used to store the program code and data. Therefore, the memory 520 may be a storage unit inside the processor 510, or an external storage unit independent of the processor 510, or a component including a storage unit inside the processor 510 and an external storage unit independent of the processor 510.

[0110] Optionally, the computing device 500 may further include a bus 540. The memory 520 and the communication interface 530 may be connected to the processor 510 via the bus 540. The bus 540 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus 540 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the figure is represented by only one line, but it does not mean that there is only one bus or one type of bus.

[0111] It should be understood that in the embodiment of the present application, the processor 510 can adopt a central processing unit (CPU). The processor can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. Or the processor 510 uses one or more integrated circuits to execute related programs to implement the technical solutions provided in the embodiments of the present application.

[0112] The memory 520 may include a read-only memory and a random access memory, and provides instructions and data to the processor 510. A portion of the processor 510 may also include a nonvolatile random access memory. For example, the processor 510 may also store information on the device type.

[0113] When the computing device 500 is running, the processor 510 executes the computer-executable instructions in the memory 520 to perform the operation steps of each method embodiment.

[0114] It should be understood that the computing device 500 according to the embodiment of the present application can correspond to the corresponding subjects in the methods according to the embodiments of the present application, and the above-mentioned and other operations and / or functions of each module in the computing device 500 are respectively for realizing the corresponding processes of each method of the present embodiment, which will not be repeated here for the sake of brevity.

[0115] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0116] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0117] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0118] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0119] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0120] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0121] The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, it is used to execute the operating steps of each method embodiment.

[0122] The computer storage medium of the embodiment of the present application can adopt any combination of one or more computer-readable media.Computer-readable media can be computer-readable signal media or computer-readable storage media.Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above.More specific examples (non-exhaustive lists) of computer-readable storage media include, electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above.In this document, computer-readable storage media can be any tangible medium containing or storing programs, which can be used by instruction execution systems, devices or devices or used in combination with them.

[0123] Computer-readable signal media may include data signals transmitted in baseband or as part of a carrier wave, which carry computer-readable program code. Such transmitted data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, transmit, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0124] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0125] Computer program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0126] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present application, all of which belong to the scope of protection of the present application.

Claims

1. A bandwidth detection method for an LTE system, characterized in that: include: Generate a first CRS signal at each of a plurality of CRS symbol positions of antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification, wherein each of the plurality of CRS symbol positions has the same position in each RB; Obtaining, from the frequency domain according to each of the bandwidths, a second CRS signal at each of the plurality of CRS symbol positions of the received LTE signal in a subframe; The actual bandwidth of the LTE system is obtained according to the correlation result between the second CRS signal and the first CRS signal at each position of the several CRS symbol positions of each bandwidth.

2. The method according to claim 1, characterized in that: The obtaining, according to the correlation result of the second CRS signal and the first CRS signal at each position of the plurality of CRS symbol positions of each bandwidth, an actual bandwidth of the LTE system includes: Obtain a correlation result between the second CRS signal and the first CRS signal at each of the plurality of CRS symbol positions of each bandwidth; averaging the correlation results of each bandwidth based on the number of RBs in the LTE system of the bandwidth, and obtaining a modulus of each mean; The LTE bandwidth corresponding to the maximum value among the moduli of the mean values ​​is used as the actual bandwidth of the LTE system.

3. The method according to claim 1, characterized in that: The correlation result of each second CRS signal and the corresponding first CRS signal is the dot product between the sequence of the second CRS signal and the conjugate sequence of the first CRS signal.

4. The method according to claim 1, characterized in that: The method of generating a first CRS signal at each position of a plurality of CRS symbol positions of antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification includes: The first CRS signal is obtained according to an assumed bandwidth of the LTE system, a cell ID and a CP type of the LTE signal, wherein the cell ID and the CP type of the LTE signal are obtained in advance.

5. The method according to claim 1, characterized in that: The obtaining, from the frequency domain according to each of the bandwidths, a second CRS signal at each of the plurality of CRS symbol positions of the received LTE signal in a subframe includes: The second CRS signal is obtained in the frequency domain according to the assumed bandwidth of the LTE system and the center frequency of the LTE cell, wherein the center frequency is obtained in advance.

6. The method according to claim 1, characterized in that: Also includes: According to the obtained bandwidth of the LTE system combined with the cell cel ID and CP type of the LTE signal, a third CRS signal of the LTE signal is obtained, wherein the third CRS signal is an actual CRS signal at each antenna port in a subframe of the LTE signal.

7. The method according to claim 6, characterized in that: Also includes: Before performing PBCH decoding, channel estimation is performed on the LTE signal according to the third CRS signal.

8. A bandwidth detection device for an LTE system, characterized in that: include: A first symbol module, configured to generate a first CRS signal at each of a plurality of CRS symbol positions of antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification, wherein each of the plurality of CRS symbol positions has the same position in each RB; A second symbol module, configured to obtain, from the frequency domain according to each of the bandwidths, a second CRS signal at each of the plurality of CRS symbol positions of the received LTE signal in a subframe; The bandwidth acquisition module is used to obtain the actual bandwidth of the LTE system according to the correlation result between the second CRS signal and the first CRS signal at each position of the plurality of CRS symbol positions of each bandwidth.

9. A computing device, characterized in that include, bus; A communication interface connected to the bus; at least one processor connected to the bus; as well as At least one memory is connected to the bus and stores program instructions, and when the program instructions are executed by the at least one processor, the at least one processor executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Program instructions are stored thereon, and when the program instructions are executed by a computer, the computer is caused to execute the method according to any one of claims 1 to 7.

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