A bandwidth detection method, device and equipment of an LTE system and a storage medium

Abstract

Embodiments of the present application provide a bandwidth detection method, device and equipment of LTE system and a storage medium. The method comprises: 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 a 3GPP specification; obtaining a second CRS signal at each position of the plurality of CRS symbol positions in a subframe of a received LTE signal from a frequency domain according to each bandwidth; and obtaining an actual bandwidth of the LTE system according to a 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. The technical solution of the embodiments of the present application obtains the corresponding CRS signal from the frequency domain according to the assumed bandwidth of the LTE before PBCH decoding, and obtains the actual bandwidth of the LTE system according to the correlation result of the CRS signal according to the 3GPP specification, thereby obtaining the actual CRS signal of the LTE signal, and improving the PBCH receiving performance based on the channel estimation of the CRS signal.

Description

Technical Field

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

[0002] In existing LTE technology, the bit stream after PBCH decoding is obtained during the network search phase, and the downlink bandwidth is obtained by parsing the bit stream.

[0003] However, the PBCH decoding is based on channel estimation using PSS / SSS. Inaccurate channel estimation leads to inaccurate PBCH decoding, which sometimes results in the inability to obtain LTE bandwidth. Summary of the Invention

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

[0005] In a first aspect, embodiments of this application provide a bandwidth detection method for an LTE system, comprising: generating a first CRS signal at each of a plurality of CRS symbol positions at antenna port 0 in a subframe for each bandwidth of LTE according to 3GPP specifications, wherein each of the plurality of CRS symbol positions is at the same position in each RB; obtaining a second CRS signal at each of the plurality of CRS symbol positions of a received LTE signal in a subframe from the frequency domain according to each bandwidth; 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 plurality of CRS symbol positions for each bandwidth.

[0006] Therefore, before PBCH decoding, the actual bandwidth of the LTE system is obtained from the correlation results of the second CRS signal and the first CRS signal according to the 3GPP specification obtained from the frequency domain based on the assumed LTE bandwidth. This is then 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 one possible implementation of the first aspect, 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 plurality of CRS symbol positions for each bandwidth includes: obtaining the correlation results of the second CRS signal and the first CRS signal at each of the plurality of CRS symbol positions for each bandwidth; averaging the correlation results for each bandwidth based on the number of RBs in the LTE system for that bandwidth, and obtaining the modulus of each average; and taking the LTE bandwidth corresponding to the maximum value among the moduli of each average as the actual bandwidth of the LTE system.

[0008] Based on the above, the modulus of the average number of RBs in the LTE system based on 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 is used, and the LTE bandwidth corresponding to the maximum value of the modulus of each average is taken as the actual bandwidth of the LTE system. Thus, the bandwidth of the LTE system can be accurately obtained without parsing the PBCH stream.

[0009] In one possible implementation of the first aspect, the correlation result between 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.

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

[0011] In one possible implementation of the first aspect, the generation of a first CRS signal at each of a plurality of CRS symbol positions at antenna port 0 in a subframe of each bandwidth of LTE according to the 3GPP specification includes: obtaining the first CRS signal based on 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] Based on the 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 location and generate the first CRS signal.

[0013] In one possible implementation of the first aspect, the method of obtaining a second CRS signal at each of the plurality of CRS symbol positions in a subframe of the received LTE signal in the frequency domain according to each of the bandwidths comprises: obtaining the second CRS signal 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.

[0014] Based on the above, the subcarriers at the CRS symbol location are determined using the pre-obtained center frequency and the assumed LTE bandwidth to obtain the second CRS signal.

[0015] In one possible implementation of the first aspect, it further 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] Based on the above, the actual CRS signal of the LTE signal is obtained using the bandwidth of the LTE system, and then used for channel estimation.

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

[0018] Therefore, before PBCH decoding, channel estimation using the actual CRS signal of the LTE signal obtained from the bandwidth of the LTE system is more accurate than channel estimation using PSS / SSS, thus improving the reception performance of PBCH.

[0019] Secondly, embodiments of this application provide a bandwidth detection device for an LTE system, comprising: a first symbol module, configured to generate a first CRS signal at each of a plurality of CRS symbol positions at antenna port 0 in a subframe for each bandwidth of LTE according to 3GPP specifications, wherein each of the plurality of CRS symbol positions is at the same position in each RB; a second symbol module, configured to obtain a second CRS signal at each of the plurality of CRS symbol positions of the received LTE signal in a subframe from the frequency domain according to each bandwidth; and a bandwidth acquisition module, configured 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 plurality of CRS symbol positions for each bandwidth.

[0020] Therefore, before PBCH decoding, the actual bandwidth of the LTE system is obtained from the correlation results of the second CRS signal and the first CRS signal according to the 3GPP specification obtained from the frequency domain based on the assumed LTE bandwidth. This is then 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 one possible implementation of the second aspect, the bandwidth acquisition module is specifically configured to: obtain the correlation result of the second CRS signal and the first CRS signal at each of the plurality of CRS symbol positions for each bandwidth; calculate the average of each correlation result for each bandwidth based on the number of RBs in the LTE system for the bandwidth, and obtain the modulus of each average; and take the LTE bandwidth corresponding to the maximum value among the moduli of each average as the actual bandwidth of the LTE system.

[0022] Based on the above, the modulus of the average number of RBs in the LTE system based on 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 is used, and the LTE bandwidth corresponding to the maximum value of the modulus of each average is taken as the actual bandwidth of the LTE system. Thus, the bandwidth of the LTE system can be accurately obtained without parsing the PBCH stream.

[0023] In one possible implementation of the second aspect, the correlation result between 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.

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

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

[0026] Based on the 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 location and generate the first CRS signal.

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

[0028] Based on the above, the subcarriers at the CRS symbol location are determined using the pre-obtained center frequency and the assumed LTE bandwidth to obtain the second CRS signal.

[0029] In one possible implementation of the second aspect, it further includes: a third symbol module, configured 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] Based on the above, the actual CRS signal of the LTE signal is obtained using the bandwidth of the LTE system, and then used for channel estimation.

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

[0032] Therefore, before PBCH decoding, channel estimation using the actual CRS signal of the LTE signal obtained from the bandwidth of the LTE system is more accurate than channel estimation using PSS / SSS, thus improving the reception performance of PBCH.

[0033] Thirdly, embodiments of this application provide a computing device, including,

[0034] bus;

[0035] A communication interface, which is 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 that, when executed by the at least one processor, cause the at least one processor to perform any of the embodiments described in the first aspect of this application.

[0038] Fourthly, embodiments of this application provide a computer-readable storage medium having program instructions stored thereon, which, when executed by a computer, cause the computer to perform any of the embodiments described in the first aspect. Attached Figure Description

[0039] Figure 1 This is a flowchart illustrating a first embodiment of a bandwidth detection method for an LTE system according to this application;

[0040] Figure 2This is a flowchart illustrating a second embodiment of a bandwidth detection method for an LTE system according to this application.

[0041] Figure 3 This is a schematic diagram of the structure of a bandwidth detection device for an LTE system according to a first embodiment of this application;

[0042] Figure 4 This is a schematic diagram of a second embodiment of a bandwidth detection device for an LTE system according to this application;

[0043] Figure 5 This is a schematic diagram of the structure of a computing device according to various embodiments of this application. Detailed Implementation

[0044] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is 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 used only to distinguish similar objects or different embodiments, and do not represent a specific ordering of objects. It is understood that a specific order or sequence may be interchanged where permitted so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0046] In the following description, the labels of the steps, such as S110, S120, etc., do not necessarily mean that the steps will be executed in this way. The order of the steps can be interchanged or executed simultaneously if permitted.

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

[0048] This application provides a bandwidth detection method, apparatus, device, and storage medium for an LTE system. The method includes: generating a first CRS signal at each of a plurality of CRS symbol positions at antenna port 0 in a subframe for each bandwidth of LTE according to 3GPP specifications, wherein each of the plurality of CRS symbol positions is at the same position in each RB; obtaining a second CRS signal at each of the plurality of CRS symbol positions of the received LTE signal in a subframe from the frequency domain according to each bandwidth; 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 plurality of CRS symbol positions for each bandwidth.

[0049] The technical solution of this application embodiment obtains the corresponding CRS signal from the frequency domain based on the assumed LTE bandwidth before PBCH decoding, and obtains the actual bandwidth of the LTE system by comparing the correlation results 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 embodiments of this application are described below with reference to the accompanying drawings. First, the LTE frame structure involved in this application is introduced.

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

[0052] To enhance LTE's resistance to multipath interference, a CP (Cyclic Prefix) is added to the data transmitted in each time slot of LTE. LTE CP types include NCP (for cells with normal coverage) and ECP (for cells with long-range coverage). Each time slot corresponding to NCP consists of 7 symbols, and each time slot corresponding to ECP consists of 6 symbols.

[0053] For ease of scheduling, LTE refers to each time slot resource of each subcarrier as an RE, and 12 carriers form a RB, with scheduling performed on a RB basis. To facilitate terminal detection of downlink signals, some REs are selected on each RB of each subframe, and some symbol resources are selected from these REs to transmit 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., and the sequence of each CRS signal is related to the bandwidth, CP type, cell ID, and symbol position of the LTE cell.

[0054] The following is combined with Figure 1This application introduces an embodiment of a bandwidth detection method for an LTE system.

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

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

[0057] In this application, each of the CRS symbol positions is identical within each RB, and each of the CRS symbol positions corresponds to a first CRS signal. The symbol position of each CRS symbol is related to the antenna port, the CellID of the LTE cell, and the CP type, etc. In the embodiments of this 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] In accordance with the 3GPP specification, in the RE position of antenna port 0 of each RB in each subframe, there are 4 CRS symbol positions used to transmit CRS symbols, and each CRS symbol position is mapped to 2 subcarriers. In some embodiments, the plurality of CRS symbol positions are selected from these 4 CRS symbol positions; in other embodiments, all 4 CRS symbol positions are selected as the plurality of CRS symbol positions.

[0059] In the 3GPP specification, the sequence of LTE CRS signals is generated from a Gold sequence. This Gold sequence is related to the LTE cell's Cell ID, CP type, and CRS symbol position. The CRS signal's position in the Gold sequence differs for LTE cells with different bandwidths. In some embodiments, for each LTE bandwidth (essentially each assumed bandwidth, hereinafter the same), using the pre-obtained LTE cell ID and CP type, and the selected CRS symbol position, a first CRS signal corresponding to each of the selected CRS symbol positions is obtained according to the 3GPP specification.

[0060] S120: Obtain the second CRS signal in a subframe from the frequency domain according to each bandwidth of LTE, where the CRS symbols 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 where each of the plurality of CRS symbol positions is located is first obtained using the center frequency of the LTE cell obtained in advance. In the frequency domain, the corresponding second CRS signal is obtained from the frequency of the subcarrier where each of the plurality of CRS symbol positions is located for each of the plurality of CRS symbol positions for each bandwidth of LTE.

[0062] S130: Based on the correlation results of the second CRS signal and the first CRS signal at each of the plurality of CRS symbol positions for each bandwidth of LTE, obtain the actual bandwidth of the LTE system.

[0063] In some embodiments, for each assumed bandwidth of LTE, the correlation results of the second CRS signal and the first CRS signal at each of the plurality of CRS symbol positions of that bandwidth are first obtained; then, the average of each correlation result is calculated based on the number of RBs in the LTE system for that bandwidth, and the modulus of the average is calculated; then, the LTE bandwidth corresponding to the maximum value among the moduli of each average is taken as the actual bandwidth of the LTE system. Preferably, the correlation result of each second CRS signal and the corresponding first CRS signal is calculated 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 obtaining the actual bandwidth of the LTE system, the actual CRS signal of the LTE signal is obtained based on the obtained bandwidth of the LTE system, combined 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 then used for PBCH decoding to improve the performance of PBCH decoding.

[0066] In summary, Embodiment 1 of a bandwidth detection method for an LTE system is used to obtain the corresponding CRS signal from the frequency domain based on the assumed LTE bandwidth and before PBCH decoding, and obtain the actual bandwidth of the LTE system by comparing the correlation results 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 channel estimation based on the CRS signal.

[0067] The following is combined with Figure 2 This application presents a second embodiment of a bandwidth detection method for an LTE system.

[0068] An embodiment of a bandwidth detection method for an LTE system, in Example 2, inherits all the methods of an embodiment 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 at the positions of all RBs carrying CRS symbols at antenna port 0 under the assumed LTE bandwidth. 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 a second embodiment of a bandwidth detection method for an LTE system is shown, which is also used after cell synchronization and before PBCH decoding, including steps S210 to S270.

[0070] S210: The position of the bearer CRS symbol of all RBs in a subframe of each bandwidth of LTE generated according to the 3GPP specification in the first CRS signal at antenna port 0.

[0071] Among them, LTE has six bandwidths, including 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, and 20MHz, with corresponding RB numbers of 6, 15, 25, 50, 75, and 100, respectively.

[0072] For each LTE bandwidth, the location of the CRS symbol carried by each RB is obtained according to the 3GPP specifications using the pre-obtained Cell ID, CP type, antenna port, etc. of the LTE cell. There are 4 CRS symbol locations on antenna port 0 in each subframe, and each location corresponds to 2 subcarriers.

[0073] Specifically, by utilizing the pre-obtained LTE cell ID, CP type, and CRS symbol position, a 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 first CRS signal in the corresponding Gold sequence is obtained based on the LTE bandwidth. This offset position is... in, This represents the number of RBs corresponding to the LTE bandwidth. Equals 110; For each LTE bandwidth, based on its corresponding offset position and the first CRS signal corresponding to each CRS symbol position in the corresponding Gold sequence, the first CRS signal corresponding to each CRS symbol position of that LTE bandwidth is obtained.

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

[0075] For details regarding the 3GPP specifications involved in this step, please refer to Chapter 6 of 3GPP specification 36211, which will not be elaborated here.

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

[0077] Specifically, based on the assumed LTE bandwidth, the cell center frequency of the pre-obtained LTE signal, and the CRS symbol position of each RB, the frequencies of the subcarriers at the four CRS symbol positions of antenna port 0 are determined. For each LTE bandwidth, four second CRS signals of the received LTE signal are obtained from these four frequencies, denoted as... k is the identifier of the subcarrier carrying the CRS symbol, and n is the identifier of the LTE bandwidth.

[0078] S230: Obtain the correlation results of the second CRS signal and the first CRS signal for each CRS symbol location for each bandwidth of LTE.

[0079] The correlation results between each second CRS signal and the corresponding first CRS signal for each bandwidth of LTE are obtained through equation (1). This is the relevant result for the position of the first CRS symbol. This is the relevant result for the second CRS symbol position. For the relevant result of the third CRS symbol position, This is the relevant result for the fourth CRS symbol position.

[0080]

[0081] S240: Calculate the average of the relevant results for each LTE bandwidth based on the number of RBs, and obtain the modulus of the average for each LTE bandwidth.

[0082] In this context, the mean of each correlation result for each LTE bandwidth is calculated based on the number of RBs using equation (2), where coorn is the modulus of the mean of each correlation result for the LTE system with bandwidth identifier n.

[0083]

[0084] S250: The LTE bandwidth corresponding to the maximum value among the modulo values ​​of each of the above means is taken as the actual bandwidth of the LTE system.

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

[0086] S260: By utilizing the bandwidth of the obtained LTE system and combining it with the cell ID and CP type of the LTE signal, the third CRS signal of the LTE signal is obtained.

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

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

[0089] Existing technologies typically involve first performing channel estimation based on the synchronization signal (PSS / SSS), then decoding the PBCH code stream based on this estimation, and finally obtaining the LTE bandwidth and CRS based on the decoding information of the PBCH code stream. This embodiment first obtains the CRS signal, then performs channel estimation on the LTE signal, and decodes the PBCH based on the channel estimation, thus improving PBCH decoding performance.

[0090] In this embodiment, the PBCH decoding based on the channel estimation of the CRS is more accurate and has better performance than the existing technology that decodes the PBCH code stream based on the channel estimation of the synchronization signal.

[0091] The following is combined with Figure 3 This document introduces an embodiment of a bandwidth detection device for an LTE system.

[0092] An embodiment of a bandwidth detection device for an LTE system is used to implement the method described in the embodiment of a bandwidth detection method for an LTE system, and has all its advantages.

[0093] Figure 3 The structure of a bandwidth detection device for an LTE system is shown in Embodiment 1, 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 of several CRS symbol positions at antenna port 0 in a subframe of each bandwidth of LTE, according to the 3GPP specifications. For its working principle and advantages, please refer to step S110 of Embodiment 1 of a bandwidth detection method for an LTE system.

[0095] The second symbol module 320 is used to obtain, from the frequency domain, the second CRS signal located at antenna port 0 of the plurality of CRS symbols in a subframe of the received LTE signal according to each bandwidth of LTE. 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 based on the correlation results of the second CRS signal and the first CRS signal at each of the plurality of CRS symbol positions for 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] The following is combined with Figure 4 This document introduces a second embodiment of a bandwidth detection device for an LTE system.

[0098] An embodiment of a bandwidth detection device for an LTE system is used to implement the method described in embodiment two of an LTE system bandwidth detection method, 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 the first CRS signal at each of the several CRS symbol positions at 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, the second CRS signal located at antenna port 0 of the plurality of CRS symbols in a subframe of the received LTE signal according to each bandwidth of LTE. 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 results of the second CRS signal and the first CRS signal for each CRS symbol position of each bandwidth in 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 calculate the average of each relevant result for each LTE bandwidth based on the number of RBs, obtain the modulus of the average for each LTE bandwidth, and take the LTE bandwidth corresponding to the maximum value among the moduli of each average 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 Embodiment 2 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 based on the third CRS signal, and to decode the PBCH based on the channel estimation. For its working principle and advantages, please refer to step S270 of Embodiment 2 of a bandwidth detection method for an LTE system.

[0106] This application also provides a computing device, which will be described below in conjunction with... 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 the figure can be used to communicate with other devices.

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

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

[0111] It should be understood that in the embodiments of this application, the processor 510 may be a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. Alternatively, the processor 510 may employ one or more integrated circuits to execute relevant programs to implement the technical solutions provided in the embodiments of this application.

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

[0113] When the computing device 500 is running, the processor 510 executes computer execution instructions stored 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 embodiments of this application can correspond to the corresponding subject in executing the methods according to the various embodiments of this application, and the above and other operations and / or functions of each module in the computing device 500 are respectively for implementing the corresponding processes of the methods of this embodiment. For the sake of brevity, they will not be described in detail here.

[0115] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

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

[0117] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

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

[0119] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0120] If the aforementioned functions are implemented as 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 this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0121] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, is used to perform the operation steps of the various method embodiments.

[0122] The computer storage medium in this application embodiment can be any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. For example, a computer-readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

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

[0124] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including, but not limited to, wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

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

[0126] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, all of which fall within the scope of protection of this application.

Claims

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

2. The method according to claim 1, characterized in that, The method of 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 plurality of CRS symbol positions for each bandwidth includes: Obtain the correlation results of the second CRS signal and the first CRS signal at each of the plurality of CRS symbol positions for each bandwidth; For each of the aforementioned related results for each bandwidth, the average value is calculated based on the number of RBs in the LTE system for that bandwidth, and the modulus of each average value is obtained. The LTE bandwidth corresponding to the maximum value among the modulo values ​​of each mean is taken as the actual bandwidth of the LTE system.

3. The method according to claim 1, characterized in that, The correlation result between 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 generation of the first CRS signal at each of several CRS symbol positions in a subframe of each bandwidth in the LTE specification of 3GPP includes: The first CRS signal is obtained based on the assumed bandwidth of the LTE system, the cell ID of the LTE signal, and the CP type, wherein the cell ID and CP type of the LTE signal are obtained in advance.

5. The method according to claim 1, characterized in that, The method of obtaining the second CRS signal at each of the plurality of CRS symbol positions in a subframe of the received LTE signal from the frequency domain according to each bandwidth includes: The second CRS signal is obtained in the frequency domain based on 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: Based on the obtained bandwidth of the LTE system and the cell ID and CP type of the LTE signal, the third CRS signal of the LTE signal is obtained, wherein the third CRS signal is the 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 PBCH decoding, channel estimation is performed on the LTE signal based on the third CRS signal.

8. A bandwidth detection device for an LTE system, characterized in that, include: The first symbol module is used to generate a first CRS signal at each of a plurality of CRS symbol positions at antenna port 0 in a subframe of each bandwidth of LTE in the 3GPP specification, wherein each of the plurality of CRS symbol positions is the same in each RB. The second symbol module is used to obtain, in accordance with each bandwidth, the second CRS signal of the received LTE signal in a subframe at each of the plurality of CRS symbol positions at antenna port 0; The bandwidth acquisition module is 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 plurality of CRS symbol positions for each bandwidth.

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

10. A computer-readable storage medium, characterized in that, It stores program instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 7.

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