CN102833849B - Positioning method and user equipment - Google Patents

Abstract

The invention discloses a positioning method and user equipment. The positioning method includes acquiring the FFT (fast Fourier transform)/IFFT (inverse fast Fourier transform) point Ncorr which is used for PRS (position reference signal) correlation operation; acquiring the IFFT point Nifft-ofdm used for OFDM (orthogonal frequency division multiplexing) symbols corresponding to PRS bandwidth of a cell; receiving a PRS receiving sequence in the occasion according to a normal sampling rate to generate a PRS local sequence without CP(cyclic prefix) in the cell when the Nifft-ofdm is larger than or equal to half the Ncorr, and carrying out correlation operation for the PRS local sequence without the CP and the PRS receiving sequence which is received according to the normal sampling rate on the basis of the Ncorr so as to acquire an arrival time of the PRS of the cell and realize OTDOA (observation time difference of arrival) positioning. The Ncorr is a preset value which cannot change along with the PRS bandwidth and is smaller than or equal to 2048. Due to the FFT/IFFT point Ncorr, which is used for the PRS (position reference signal) correlation operation, does not change along with the PRS bandwidth and is not higher than 2048, the requirements of fast correlation to FFT/IFFT resources can be lowered.

Description

Positioning method and user equipment

Technical Field

The present invention relates to the field of communications, and more particularly, to a method and user equipment for positioning.

Background

In LTE (Long Term Evolution ) R9 (release 9, version 9), it is proposed to transmit PRS (positioning Reference Signal) to implement OTDOA (observed Time Difference of Arrival) positioning technology. OTDOA positioning is a terminal-assisted positioning method. That is, the base station transmits PRS signals, the terminal receives PRS signals transmitted by each base station within a PRS measurement opportunity (interference), measures a Reference Signal Time difference RSTD (Reference Signal Time difference) of the PRS signals transmitted by each base station, and reports the Time difference to the base station. And the base station carries out hyperbolic positioning according to the RSTD to obtain the estimated terminal position.

The method for measuring the RSTD by the terminal comprises the following steps:

1) measuring the arrival time of a PRS signal of a serving cell;

2) measuring the arrival time of PRS signals of neighbor cells;

3) and the arrival time of the PRS signal of the neighbor cell is reduced by the arrival time of the PRS signal of the serving cell, and the RSTD of each neighbor cell relative to the serving cell is obtained.

The method for the terminal to measure the arrival time of the PRS signal of the single cell comprises the following steps:

1) and receiving OTDOA positioning assistance information sent by the base station.

2) And generating a plurality of PRS subframes one by one according to the PRS information of the cell in the auxiliary message, wherein the symbols containing the PRS signals are generated by adopting the following method, and other symbols fill in zero of corresponding sampling points.

a. Generating a local PRS frequency domain signal;

b. transforming the local PRS frequency domain signal to the time domain by using IFFT (Inverse Fast Fourier Transform);

c. and CP (cyclic prefix) is added.

3) And the correlation with the received signal, and the coherent or non-coherent combination of the correlation sub-frames to obtain the position of the maximum correlation value and the strongest path delay.

4) And estimating the time delay of the earliest path according to the strongest path to obtain the PRS arrival time of the cell.

Since the PRS arrival time of a single cell is obtained by correlating the received signal with the local PRS signal, the computational complexity is high. If x (N), y (N) are finite sequences of length N, then x (N), y (N) are related to the expression:

<math> <mrow> <msub> <mi>r</mi> <mi>xy</mi> </msub> <mrow> <mo>(</mo> <mi>&tau;</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>x</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mi>&tau;</mi> <mo>)</mo> </mrow> <mi>y</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>x</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mi>y</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>+</mo> <mi>&tau;</mi> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </math>

operations can be accelerated using FFT (Fast Fourier Transform) and IFFT. The number of IFFT/FFT points for fast correlation is N_corrMore than or equal to N + N-1, and the correlation value is as follows:

$r_{\mathrm{xy}}\left(k\right)=\mathrm{IFFT}\left(R_{\mathrm{xy}}\left(K\right)\right)=\mathrm{IFFT}(X^{*}\left(K\right)*Y\left(K\right))$

<math> <mrow> <mo>=</mo> <mi>IFFT</mi> <mrow> <mo>(</mo> <mi>FFT</mi> <mrow> <mo>(</mo> <mover> <mi>x</mi> <mo>&OverBar;</mo> </mover> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>)</mo> </mrow> <mo>*</mo> <mi>FFT</mi> <mrow> <mo>(</mo> <mover> <mi>y</mi> <mo>&OverBar;</mo> </mover> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>)</mo> </mrow> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> </math>

<math> <mrow> <mover> <mi>x</mi> <mo>&OverBar;</mo> </mover> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <mi>x</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> </mtd> <mtd> <mn>0</mn> <mo>&le;</mo> <mi>k</mi> <mo>&lt;</mo> <mi>N</mi> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mi>N</mi> <mo>&le;</mo> <mi>k</mi> <mo>&lt;</mo> <msub> <mi>N</mi> <mi>corr</mi> </msub> </mtd> </mtr> </mtable> </mfenced> </mrow> </math> <math> <mrow> <mover> <mi>y</mi> <mo>&OverBar;</mo> </mover> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <mi>y</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> </mtd> <mtd> <mn>0</mn> <mo>&le;</mo> <mi>k</mi> <mo>&lt;</mo> <mi>N</mi> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mi>N</mi> <mo>&le;</mo> <mi>k</mi> <mo>&lt;</mo> <msub> <mi>N</mi> <mi>corr</mi> </msub> </mtd> </mtr> </mtable> </mfenced> </mrow> </math>

to speed up the operation, the number of points N of the FFT/IFFT is usually_corrIs an integer power of 2.

Since the PRS subframe is 1ms, each subframe contains a plurality of PRS symbols, for example, when the PRS bandwidth is 20M, a sample point within 1ms is 30720 points according to a normal sampling rate of 30.72M, which is not practical by directly using the fast correlation method.

Disclosure of Invention

The embodiment of the invention provides a positioning method and user equipment, which can reduce the requirement of fast correlation on FFT/IFFT resources.

In a first aspect, a method for positioning is provided, where the method includes: fast Fourier Transform (FFT)/fast inverse Fourier transform (IFFT) point number N used for obtaining Positioning Reference Signal (PRS) related operation_corrN of the group_corrIs a predetermined value that does not vary with the PRS bandwidth, and N is_corrLess than or equal to 2048; obtaining IFFT point number N adopted by orthogonal frequency division multiplexing OFDM symbol corresponding to PRS bandwidth of cell_ifft-ofdm(ii) a In N_ifft-ofdm≥N_corrWhen the cell is/2, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate, the PRS local sequence without the cyclic prefix CP of the cell is generated, and the N is based on_corrThe PRS local sequence without CP is compared with PR received by normal sampling rateAnd S, the receiving sequence carries out correlation operation to obtain PRS arrival time of the cell and carries out OTDOA positioning of the observed time difference of arrival.

In a first possible implementation manner, with reference to the first aspect, the method further includes: in N_ifft-ofdm<N_corrWhen the cell is/2, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate, the PRS local sequence with the CP of the cell is generated, and the N is based on the PRS local sequence_corrAnd carrying out correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning.

In a second possible implementation manner, with reference to the first aspect, the method further includes: in N_ifft-ofdm<N_corrWhen the cell is/2, the PRS receiving sequence in the current opportunity is received by adopting the oversampling rate, the PRS local sequence of the oversampling band CP of the cell is generated, and the N is based on the PRS local sequence_corrAnd carrying out correlation operation on the PRS local sequence of the over-sampling band CP and the PRS receiving sequence received by adopting the over-sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning.

In a third possible implementation manner, with reference to the first aspect or the first or second possible implementation manner of the first aspect, the N is_corr2048, 1024 or 512.

In a fourth possible implementation manner, with reference to the first aspect or the third possible implementation manner of the first aspect, based on the N_corrPerforming correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate, and specifically realizing that: taking the ith segment sequence of the PRS local sequence without the CP, wherein i is an integer, i is more than or equal to 0 and less than or equal to slice-1, slice is the number of slices, and slice =2N_ifft-ofdm/N_corrThe initial position is L_{ind_i}，L_{ind_i}=L_{ind_i-1}+N_corr/2，L_{ind_0}Length of 0, N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, N_corrFFT of long local sequencesTransforming to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_i}，Y_{ind_i}=Y_{ind_i-1}+N_corr/2，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 Length as N in ith slice of PRS local sequence without CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining the PRS local sequence N without CP_corrLong correlation value r (n).

In a fifth possible implementation manner, with reference to the first or third possible implementation manner of the first aspect, based on the N_corrPerforming correlation operation on the PRS local sequence with the CP and the PRS receiving sequence received by adopting a normal sampling rate, and specifically realizing that: taking the 0 th segment sequence of the PRS local sequence with the CP, wherein the initial position is zero, and the length is N_ifft-ofdm+N_cp，N_cpFor CP Length, add N later_corr-(N_ifft-ofdm+N_cp) Long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X₀(K) (ii) a Taking 0 th segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_cp}，Y_{ind_cp}=Y_{ind_0}-N_cp，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y₀(K) (ii) a Taking IFFT (Conj (X)₀(K))*Y₀(K) First N of (b)_corrThe length of the PRS local sequence N is taken as the length of the CP_corrA long correlation value r (N), 0. ltoreq. n.ltoreq.N_corr/2-1。

In a sixth possible implementation manner, with reference to the second or third possible implementation manner of the first aspect, based on the N_corrPerforming correlation operation on the PRS local sequence of the over-sampling band CP and the PRS receiving sequence received by adopting the over-sampling rate, and specifically realizing the following steps: taking the ith segment sequence of the PRS local sequence of the oversampling band CP, i being an integer and being more than or equal to 0 and less than or equal to slice_cp-1，slice_cpThe number of the slices is the number of the slices,N_upsamplethe initial position is L for the multiple of the oversampling rate_{ind_cp_i}，L_{ind_cp_i}=L_{ind_cp_i-1}+N_corr/2，L_{ind_cp_0}I is not less than 0 and not more than slice_cpWhen-2, length is taken as N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, in i-slice_cpWhen-1, length is taken as N_upsample(N_ifft-ofdm+N_cp)-(slice_cp-1)*N_corrAnd/2, adding a zero sequence to the sequence to form N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by adopting oversampling rate, and setting the starting position as Y_{ind_cp_i}，Y_{ind_cp_i}=Y_{ind_cp_i-1}+N_corr/2，Y_{ind_cp_0}=N_upsample(Y_{ind_0}-N_cp)，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as the length of N in the ith slice of the PRS local sequence of the oversampling band CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining the processPRS local sequence N of sample band CP_corrLong correlation value r (n).

In a second aspect, a user equipment is provided, including: an obtaining module, configured to obtain FFT/IFFT points N used for PRS correlation operation of positioning reference signals_corrN of the group_corrIs a predetermined value that does not vary with the PRS bandwidth, and N is_corrLess than or equal to 2048, and obtaining IFFT point number N adopted by orthogonal frequency division multiplexing OFDM symbol corresponding to PRS bandwidth of cell_ifft-ofdm(ii) a A receiving module for receiving at N_ifft-ofdm≥N_corrWhen the PRS receiving sequence is in the opportunity, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate; a processing module for processing at N_ifft-ofdm≥N_corrAt/2, generating PRS local sequence without cyclic prefix CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning of the observed time difference of arrival.

In a first possible implementation manner, with reference to the second aspect, the receiving module is further configured to perform N_ifft-ofdm<N_corrWhen the PRS receiving sequence is in the opportunity, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate; the processing module is also configured to process the data at N_ifft-ofdm<N_corrAt/2, generating PRS local sequence with CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning.

In a second possible implementation manner, with reference to the second aspect, the receiving module is further configured to perform the following operation in N_ifft-ofdm<N_corrWhen the PRS receiving sequence is in the opportunity, adopting the oversampling rate to receive the PRS receiving sequence in the opportunity; the processing module is also configured to process the data at N_ifft-ofdm<N_corrAt/2, generating a PRS local sequence of the over-sample band CP for the cell based on the N_corrComparing the PRS local sequence of the over-sampled band CP with that received at the over-sampling rateAnd performing correlation operation on the PRS receiving sequence to acquire the PRS arrival time of the cell for OTDOA positioning.

In a third possible implementation manner, with reference to the second aspect or the first or second possible implementation manner of the second aspect, the N_corr2048, 1024 or 512.

In a fourth possible implementation manner, with reference to the second aspect or the third possible implementation manner of the second aspect, the processing module is specifically configured to take an i-th segment sequence of the PRS local sequence without a CP, where i is an integer and is greater than or equal to 0 and less than or equal to slice-1, where slice is a slice number, and slice =2N_ifft-ofdm/N_corrThe initial position is L_{ind_i}，L_{ind_i}=L_{ind_i-1}+N_corr/2，L_{ind_0}Length of 0, N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_i}，Y_{ind_i}=Y_{ind_i-1}+N_corr/2，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 Length as N in ith slice of PRS local sequence without CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining the PRS local sequence N without CP_corrLong correlation value r (n).

In a fifth possible implementation manner, with reference to the first or third possible implementation manner of the second aspect, the processing module is specifically configured to take the 0 th segment of the PRS local sequence with CP, where the start position is zero,length N_ifft-ofdm+N_cp，N_cpFor CP Length, add N later_corr-(N_ifft-ofdm+N_cp) Long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X₀(K) (ii) a Taking 0 th segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_cp}，Y_{ind_cp}=Y_{ind_0}-N_cp，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y₀(K) (ii) a Taking IFFT (Conj (X)₀(K))*Y₀(K) First N of (b)_corrThe length of the PRS local sequence N is taken as the length of the CP_corrA long correlation value r (N), 0. ltoreq. n.ltoreq.N_corr/2-1。

In a sixth possible implementation manner, with reference to the second or third possible implementation manner of the second aspect, the processing module is specifically configured to take an i-th segment of the PRS local sequence of the oversampled band CP, where i is an integer and is greater than or equal to 0 and less than or equal to i and less than or equal to slice_cp-1，slice_cpThe number of the slices is the number of the slices,N_upsamplethe initial position is L for the multiple of the oversampling rate_{ind_cp_i}，L_{ind_cp_i}=L_{ind_cp_i-1}+N_corr/2，L_{ind_cp_0}I is not less than 0 and not more than slice_cpWhen-2, length is taken as N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, in i-slice_cpWhen-1, length is taken as N_upsample(N_ifft-ofdm+N_cp)-(slice_cp-1)*N_corrAnd/2, adding a zero sequence to the sequence to form N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by adopting oversampling rate, and setting the starting position as Y_{ind_cp_i}，Y_{ind_cp_i}=Y_{ind cp i-1}+N_corr/2，Y_{ind_cp_0}=N_upsample(Y_{ind_0}-N_cp)，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as the length of N in the ith slice of the PRS local sequence of the oversampling band CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining PRS local sequence N of the over-sampling band CP_corrLong correlation value r (n).

Based on the technical scheme, the positioning method and the user equipment of the embodiment of the invention use the FFT/IFFT point N which does not change with the PRS bandwidth through the PRS related operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic flow chart of a method of positioning according to an embodiment of the invention.

Fig. 2 is another schematic flow chart of a method of positioning according to an embodiment of the invention.

Fig. 3 is yet another schematic flow chart of a method of positioning according to an embodiment of the invention.

Fig. 4 is a schematic block diagram of a user equipment according to an embodiment of the present invention.

Fig. 5 is a schematic block diagram of a user equipment according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that the technical solution of the embodiment of the present invention can be applied to various communication systems that use OFDM (Orthogonal Frequency Division multiplexing) reference signals for positioning, for example: a Long Term Evolution (Long Term Evolution, abbreviated as "LTE") system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, and the like.

It should also be understood that, in the embodiments of the present invention, a User Equipment (UE) may communicate with one or more core networks via a Radio Access Network (RAN), for example, the User Equipment may be a mobile phone, a computer, etc., and may also be a portable, pocket, hand-held, computer-embedded, or vehicle-mounted Radio transceiver device, which exchanges voice and/or data with the RAN.

In the embodiment of the present invention, the signal refers to a baseband digital signal, and therefore, after being sampled at a certain sampling rate, the signal is mathematically represented as a discrete sequence, which is also called a symbol if the length of the sequence is the length of one symbol, and is also called a subframe if the length of the sequence is the length of one subframe, and so on.

Fig. 1 shows a schematic flow diagram of a method 100 of positioning according to an embodiment of the invention. The method 100 is performed by a user equipment, as shown in fig. 1, the method 100 includes:

s110, obtaining Fast Fourier Transform (FFT)/fast inverse Fourier transform (IFFT) points N used for Positioning Reference Signal (PRS) correlation operation_corrN of the group_corrIs a predetermined value that does not vary with the PRS bandwidth, and N is_corrLess than or equal to 2048;

s120, obtaining IFFT points N adopted by OFDM symbols corresponding to PRS bandwidth of cell_ifft-ofdm；

S130, in N_ifft-ofdm≥N_corrWhen the cell is/2, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate, the PRS local sequence without the cyclic prefix CP of the cell is generated, and the N is based on_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning of the observed time difference of arrival.

In OTDOA positioning, the PRS arrival time of a single cell is obtained by correlating the received signal with the local PRS signal, and correlation operations use FFT and IFFT to speed up the operations. Since PRS contain multiple PRS symbols per subframe, it is not practical to directly use the fast correlation approach. It is therefore necessary to correlate each OFDM symbol within the subframe separately. And coherently combining the correlation values in each OFDM symbol to obtain the correlation value in the whole subframe.

The PRS symbols are OFDM modulated by IFFT. Different IFFT points N respectively corresponding to different PRS bandwidths according to different protocols_ifft-ofdmFor example, the IFFT points corresponding to the system bandwidth of 1.4/3/5/10/15/20M are128/256/512/1024/2048/2048. However, in order to resist multipath spreading, a CP needs to be added in front of each OFDM symbol, and the length of the CP is N_cpThen one symbol length increased by CP does not satisfy an integer power of 2.

To achieve correlation of a received PRS symbol and a local PRS symbol, N is used for the case where the local sequence is without a CP_corr=2N_ifft-ofdmN can be obtained at a time_ifft-ofdmThe correlation value of the point. The system bandwidth of 1.4/3/5/10/15/20M is respectively corresponding to the FFT/IFFT points used in correlation being 256/512/1024/2048/2048/4096, namely, the system bandwidth can satisfy an integral power of 2. For the case of the local sequence with CP, N is satisfied_corr≥(N_ifft-ofdm+N_cp)+(N_ifft-ofdm+N_cp) 1, when N is_corr=4N_ifft-ofdmThen N can be obtained at one time_corr-(N_ifft-ofdm+N_cp) The correlation value of the point is 512/1024/2048/2048/4096/8192 corresponding to the FFT/IFFT points used in the correlation respectively for the system bandwidth of 1.4/3/5/10/15/20M, and the integral power of 2 can be satisfied.

Since the complexity of implementation is determined by the maximum bandwidth, the maximum resources required for the correlation of the local sequence band CP are 8192 IFFT/FFT resources. Local sequence no CP correlation requires IFFT/FFT resources with a maximum resource of 4096 points. In order to generate local OFDM signals corresponding to PRSs with different bandwidths, the maximum IFFT point number is 2048 points. Therefore, directly employing the fast correlation algorithm results in an increase in IFFT resources.

In the embodiment of the invention, in order to reduce the requirement of fast correlation on FFT/IFFT resources, the number of FFT/IFFT points N is_corrA predetermined value less than or equal to 2048 that does not vary with PRS bandwidth is employed. That is, the same N is employed for different PRS bandwidth configurations_corrAnd N is_corrNot more than the maximum IFFT points 2048 required for OFDM symbol generation. And the user equipment judges whether the band CP is related according to the size of the PRS bandwidth of the cell. The user equipment obtains IFFT points N adopted by OFDM symbols corresponding to the PRS bandwidth of the cell according to the PRS bandwidth of the cell_ifft-ofdmDue to N_corrBy using a predetermined value which does not vary with the PRS bandwidth, N can be passed_ifft-ofdmAnd N_corrThe magnitude relationship of (c) determines whether the CP is correlated. In N_ifft-ofdm≥N_corrAnd/2, the PRS bandwidth of the cell is larger, and the user equipment receives the PRS receiving sequence in the opportunity by adopting a normal sampling rate (such as a Nyquist sampling rate). With a normal sampling rate, i.e., without an oversampling rate, for example, 30.72M for 20M and 15M bandwidths, 15.36M for 10M bandwidth, 7.68M for 5M bandwidth, 3.84M for 3M bandwidth, 1.92M for 1.4M bandwidth, 30720, 15360, 7680, 3840, and 1920 samples are taken in a corresponding 1ms subframe. The user equipment generates a PRS local sequence without CP for the cell and then bases on the N_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning. FFT/IFFT points N used for correlation operation_corrIs a predetermined value not exceeding 2048, thus reducing the high requirements of fast correlation on FFT/IFFT specifications.

Therefore, in the positioning method of the embodiment of the invention, the FFT/IFFT points N which do not change with the PRS bandwidth are used by the PRS correlation operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced.

In the present embodiment, N_corrPreferably 2048, 1024 or 512. Accordingly, the local sequence slice length N_corrPreferred values for/2 are 1024, 512 or 256. Since the IFFT/FFT operation efficiency of small points is low for the IFFT/FFT operation of large points, N is considered from the viewpoint of operation efficiency_corr=2048 is the optimum without increasing IFFT resources, but considering memory requirements, N_corr=1024, or N_corr=512 is more memory efficient.

In S130, the user equipment is in N_ifft-ofdm≥N_corrWhen the PRS receiving sequence is generated, the PRS receiving sequence in the opportunity is received by adopting a normal sampling ratePRS local sequence without CP for a cell based on this N_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning.

In N_ifft-ofdm≥N_corrAnd 2, the PRS bandwidth of the cell is large, an oversampling mode is not adopted, a normal sampling mode is adopted, and the user equipment receives the PRS receiving sequence in the opportunity at a normal sampling rate. Because the PRS bandwidth of the cell is large, the PRS local sequence without the CP of the cell is generated by the user equipment to be correlated with the receiving sequence by adopting the mode without the CP. The user equipment generates local PRS frequency domain signals on corresponding bandwidths in corresponding subframes one by one according to PRS information of the cell in the OTDOA positioning auxiliary information sent by the base station, then the local PRS frequency domain signals are converted to a time domain by adopting IFFT conversion without adding a CP, and a PRS local sequence without the CP of the cell is obtained, wherein the number of IFFT points is N_ifft-ofdmI.e. the local sequence length is N_ifft-ofdm. The user equipment then bases on this N_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate to obtain a correlation value, thereby obtaining the PRS arrival time of the cell for OTDOA positioning. Optionally based on the N_corrCorrelating the PRS local sequence without the CP with a PRS received sequence received at a normal sampling rate, comprising:

taking the ith segment sequence of the PRS local sequence without the CP, wherein i is an integer, i is more than or equal to 0 and less than or equal to slice-1, slice is the number of slices, and slice =2N_ifft-ofdm/N_corrThe initial position is L_{ind_i}，L_{ind_i}=L_{ind_i-1}+N_corr/2，L_{ind_0}Length of 0, N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K)；

Taking the ith segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_i}，Y_{ind_i}=Y_{ind_i-1}+N_corr/2，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K)；

Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 Length as N in ith slice of PRS local sequence without CP_corrLong correlation value r_i(n)，0≤n≤N_corr/2-1；

According toObtaining the PRS local sequence N without CP_corrLong correlation value r (n).

Specifically, for normal sampling, without CP mode, slice number slice =2N_ifft-ofdm/N_corr. In N_ifft-ofdm≥N_corrAt/2, the minimum number of slices is 1. To obtain a local sequence N_corr2 Long correlation value r (N), N in each local sequence slice needs to be obtained_corrLong correlation value r_i(n) and then added correspondingly, i.e.N within each local sequence slice_corrLong correlation value r_i(n) the obtaining method comprises:

1) taking the ith sequence of the local sequence, and setting the initial position as L_{ind_i}Length of N_corr/2, rear N_corrThe/2 sequence is zero, constituting N_corrLong local sequence FFT input, where L_{ind_i}Initial value L_{ind_0}A value of 0 indicates that the symbol is taken from the first data, and the local sequence start position updating mode is as follows: l is_{ind_i}=L_{ind_i-1}+N_corr/2。

2) Will N_corrThe long local sequence FFT input is input to,performing FFT to obtain X_i(K)。

3) Taking the ith segment sequence corresponding to the received sequence, and setting the initial position as Y_{ind_i}Taken as length N_corrForm N_corrA long received sequence FFT input, where Y_{ind_i}Initial value of Y_{ind_0}The updating method of the initial position of the receiving sequence is as follows: y is_{ind_i}=Y_{ind_i-1}+N_corr/2。

4) Will N_corrFFT input of long receiving sequence, FFT conversion to obtain Y_i(K)。

5）Conj(X_i(K) Dot by Y_i(K) Or Y_i(K) Dot-by-dot Conj (X)_i(K) Obtaining N_corrA long IFFT input.

6）IFFT(Conj(X_i(K))*Y_i(K) Or IFFT (Y)_i(K)*Conj(X_i(K) )) to obtain N_corrA long IFFT output.

7) Taking N before_corr2 as r_i(n)。

At the time of obtaining all r_iAfter (n) is according toObtaining the entire local sequence N_corrLong correlation value r (n).

In the embodiment of the present invention, as shown in fig. 2, optionally, the method 100 further includes:

s140, at N_ifft-ofdm<N_corrWhen the cell is/2, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate, the PRS local sequence with the CP of the cell is generated, and the N is based on the PRS local sequence_corrAnd carrying out correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning.

In N_ifft-ofdm<N_corrAt the time of 2, the PRS bandwidth of the cell is smaller and contains PRS informationThe number of subcarriers of the signal is small, and the number of sample points participating in operation can be increased by carrying out correlation with the CP, so that the correlation characteristic of the signal is improved, and certain performance can be ensured by carrying out correlation with the CP at this time. Thus, in N_ifft-ofdm<N_corrAnd/2, a normal sampling mode with a CP mode can be adopted, namely, the user equipment receives the PRS receiving sequence in the opportunity at a normal sampling rate, and generates the PRS local sequence with the CP of the cell and the receiving sequence to perform correlation operation. The user equipment generates local PRS frequency domain signals on corresponding bandwidths in corresponding subframes one by one according to PRS information of the cell in the OTDOA positioning auxiliary information sent by the base station, and then converts the local PRS frequency domain signals to a time domain by adopting IFFT conversion, wherein the number of IFFT points is N_ifft-ofdmAdding CP to obtain the PRS local sequence with CP of the cell, i.e. the last N of ofdm symbols_cpThe data with length is copied in ofdm symbol header to form length N_ifft-ofdm+N_cpThe symbol of (2). The user equipment then bases on this N_corrAnd carrying out correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate to obtain a correlation value, thereby obtaining the PRS arrival time of the cell so as to carry out OTDOA positioning. Optionally based on the N_corrPerforming correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate, wherein the correlation operation comprises the following steps:

taking the 0 th segment sequence of the PRS local sequence with the CP, wherein the initial position is zero, and the length is N_ifft-ofdm+N_cp，N_cpFor CP Length, add N later_corr-(N_ifft-ofdm+N_cp) Long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X₀(K)；

Taking 0 th segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_cp}，Y_{ind_cp}=Y_{ind_0}-N_cp，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y₀(K)；

Taking IFFT (Conj (X)₀(K))*Y₀(K) First N of (b)_corrThe length of the PRS local sequence N is taken as the length of the CP_corrA long correlation value r (N), 0. ltoreq. n.ltoreq.N_corr/2-1。

Specifically, in N_ifft-ofdm<N_corrWhen/2, the local sequence length is less than N_corr2, so for normal sampling, with CP mode, the number of slices is 1. Obtaining a local sequence N_corrThe long correlation r (n) is calculated by:

1) taking the 0 th segment of the local sequence, the initial position is zero, the length is N_ifft-ofdm+N_cpRear face N_corr-(N_ifft-ofdm+N_cp) Sequence is zero, forming N_corrA long local sequence FFT input.

2) Will N_corrFFT input of long local sequence, FFT conversion is carried out to obtain X₀(K)。

3) Taking the 0 th segment sequence corresponding to the received sequence, the initial position is Y_{ind_cp}，Y_{ind_cp}=Y_{ind_0}-N_cpTaken as length N_corr，Y_{ind_0}For the initial value of the initial position of the receiving sequence without CP in normal sampling, N is formed_corrA long received sequence FFT input.

4) Will N_corrFFT input of long receiving sequence, FFT conversion to obtain Y₀(K)。

5）Conj(X₀(K) ) dot by Y₀(K) Or Y₀(K) Dot-by-dot Conj (X)₀(K) Obtaining N)_corrA long IFFT input.

6）IFFT(Conj(X₀(K))*Y₀(K) Or IFFT (Y)₀(K)*Conj(X₀(K) )) to obtain N_corrA long IFFT output.

7) Taking N before_corrAnd/2 is r (n).

Therefore, in the positioning method of the embodiment of the invention, the FFT/IFFT points N which do not change with the PRS bandwidth are used by the PRS correlation operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced; and when the bandwidth is small, the PRS local sequence with the CP is generated to perform correlation operation with the receiving sequence, so that the positioning performance under the small bandwidth can be improved on the premise of not increasing the IFFT specification.

At small bandwidths, in order to enhance the small bandwidth characteristics, an oversampling mode may be adopted, and therefore, in the embodiment of the present invention, as shown in fig. 3, optionally, the method 100 further includes:

s150 at N_ifft-ofdm<N_corrWhen the cell is/2, the PRS receiving sequence in the current opportunity is received by adopting the oversampling rate, the PRS local sequence of the oversampling band CP of the cell is generated, and the N is based on the PRS local sequence_corrAnd carrying out correlation operation on the PRS local sequence of the over-sampling band CP and the PRS receiving sequence received by adopting the over-sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning.

In N_ifft-ofdm<N_corrAnd when the PRS bandwidth of the cell is smaller in the case of/2, the positioning performance under the small bandwidth can be enhanced by adopting an oversampling mode. Oversampling ratio N_upsampleIt may be preconfigured, for example, that a 3M bandwidth employs a 2-fold oversampling rate and a 1.4M bandwidth employs a 4-fold oversampling rate. Thus, in N_ifft-ofdm<N_corrAnd/2, an oversampling and CP-band mode can be adopted, that is, the user equipment receives the PRS reception sequence in the current opportunity by adopting an oversampling rate, and generates a PRS local sequence of the oversampling band CP of the cell and the reception sequence to perform correlation operation. The user equipment generates local PRS frequency domain signals on corresponding bandwidths in corresponding subframes one by one according to PRS information of the cell in the OTDOA positioning auxiliary information sent by the base station, and then (N) is added in the frequency domain signals_upsample-1)N_ifft-ofdmPoint zero, carry out N_upsample*N_ifft-ofdmPoint IFFT and CP is added, the length of CP is N_upsample*N_cpGet the cell's historyPRS local sequence of sample band CP of length N_upsample(N_ifft-ofdm+N_cp). The user equipment then bases on this N_corrAnd carrying out correlation operation on the PRS local sequence of the over-sampling band CP and the PRS receiving sequence received by adopting the over-sampling rate to obtain a correlation value, thereby obtaining the PRS arrival time of the cell so as to carry out OTDOA positioning. Optionally based on the N_corrCorrelating the PRS local sequence of the oversampled band CP with a PRS received sequence received at an oversampled rate, comprising:

taking the ith segment sequence of the PRS local sequence of the oversampling band CP, i being an integer and being more than or equal to 0 and less than or equal to slice_cp-1，slice_cpThe number of the slices is the number of the slices,N_upsamplethe initial position is L for the multiple of the oversampling rate_{ind_cp_i}，L_{ind_cp_i}=L_{ind_cp_i-1}+N_corr/2，L_{ind_cp_0}I is not less than 0 and not more than slice_cpWhen-2, length is taken as N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, in i-slice_cpWhen-1, length is taken as N_upsample(N_ifft-ofdm+N_cp)-(slice_cp-1)*N_corrAnd/2, adding a zero sequence to the sequence to form N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K)；

Taking the ith segment sequence of PRS receiving sequence received by adopting oversampling rate, and setting the starting position as Y_{ind_cp_i}，Y_{ind_cp_i}=Y_{ind_cp_i-1}+N_corr/2，Y_{ind_cp_0}=N_upsample(Y_{ind_0}-N_cp)，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K)；

Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as the length of N in the ith slice of the PRS local sequence of the oversampling band CP_corrLong correlation value r_i(n)，0≤n≤N_corr/2-1；

According toObtaining PRS local sequence N of the over-sampling band CP_corrLong correlation value r (n).

In particular, for oversampling, with CP mode, number of slicesWherein,indicating rounding up. In this case, the number of slices is not necessarily 1 or more. To obtain a local sequence N_corr2 Long correlation value r (N), N in each local sequence slice needs to be obtained_corrLong correlation value r_i(n) and then added correspondingly, i.e.N within each local sequence slice_corrLong correlation value r_i(n) the obtaining method comprises:

1) taking the ith sequence of the local sequence, and setting the initial position as L_{ind_cp_i}Length of N_corr/2, rear N_corrThe/2 sequence is zero, constituting N_corrLong local sequence FFT input, where L_{ind_cp_i}Initial value L_{ind_cp_0}A value of 0 indicates that the symbol is taken from the first data, and the local sequence start position updating mode is as follows: l is_{ind_cp_i}=L_{ind_cp_i-1}+N_corr/2. Since there may be insufficient length of the local sequence in the last slice N_corrIn this case, the remaining length is taken, i.e. i is slice_cpWhen-1, length is taken as N_upsample(N_ifft-ofdm+N_cp)-(slice_cp-1)*N_corrAnd2, taking zero the others to form N_corrA long local sequence FFT input.

2) Will N_corrFFT input of long local sequence, FFT conversion is carried out to obtain X_i(K)。

3) Taking the ith segment sequence corresponding to the received sequence, and setting the initial position as Y_{ind_cp_i}Taken as length N_corrForm N_corrA long received sequence FFT input, where Y_{ind_cp_i}Initial value of Y_{ind_cp_0}=N_upsample(Y_{ind_0}-N_cp)，Y_{ind_0}For the initial value of the initial position of the receiving sequence without CP in normal sampling, the updating mode of the initial position of the receiving sequence is as follows: y is_{ind_cp_i}=Y_{ind_cp_i-1}+N_corr/2。

4) Will N_corrFFT input of long receiving sequence, FFT conversion to obtain Y_i(K)。

5）Conj(X_i(K) Dot by Y_i(K) Or Y_i(K) Dot-by-dot Conj (X)_i(K) Obtaining N_corrA long IFFT input.

6）IFFT(Conj(X_i(K))*Y_i(K) Or IFFT (Y)_i(K)*Conj(X_i(K) )) to obtain N_corrA long IFFT output.

7) Taking N before_corr2 as r_i(n)。

At the time of obtaining all r_iAfter (n) is according toObtaining the entire local sequence N_corrLong correlation value r (n).

Therefore, in the positioning method of the embodiment of the invention, the FFT/IFFT points N which do not change with the PRS bandwidth are used by the PRS correlation operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced; and, at small bandwidths, oversampling is generatedThe PRS local sequence with the CP and the receiving sequence carry out correlation operation, and the positioning performance under small bandwidth can be enhanced on the premise of not increasing IFFT specification.

The method for positioning according to the embodiment of the present invention is described in detail above with reference to fig. 1 to 3, and a user equipment according to the embodiment of the present invention will be described below with reference to fig. 4 and 5.

Fig. 4 shows a schematic block diagram of a user equipment 400 according to an embodiment of the invention. As shown in fig. 4, the user equipment 400 includes:

an obtaining module 410, configured to obtain FFT/IFFT points N used for PRS correlation operation of positioning reference signals_corrN of the group_corrIs a predetermined value that does not vary with the PRS bandwidth, and N is_corrLess than or equal to 2048, and obtaining IFFT point number N adopted by orthogonal frequency division multiplexing OFDM symbol corresponding to PRS bandwidth of cell_ifft-ofdm；

A receiving module 420 for receiving at N_ifft-ofdm≥N_corrWhen the PRS receiving sequence is in the opportunity, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate;

a processing module 430 for processing at N_ifft-ofdm≥N_corrAt/2, generating PRS local sequence without cyclic prefix CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning of the observed time difference of arrival.

The user equipment of the embodiment of the invention uses the FFT/IFFT point N which does not change with the PRS bandwidth through the PRS related operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced.

In this embodiment of the present invention, optionally, the receiving module 420 is further configured to receive a request at N_ifft-ofdm<N_corrWhen the PRS receiving sequence in the opportunity is received at the normal sampling rate in 2Columns;

the processing module 430 is also configured to process the data at N_ifft-ofdm<N_corrAt/2, generating PRS local sequence with CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning.

The user equipment of the embodiment of the invention uses the FFT/IFFT point N which does not change with the PRS bandwidth through the PRS related operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced; and when the bandwidth is small, the PRS local sequence with the CP is generated to perform correlation operation with the receiving sequence, so that the positioning performance under the small bandwidth can be improved on the premise of not increasing the IFFT specification.

In this embodiment of the present invention, optionally, the receiving module 420 is further configured to receive a request at N_ifft-ofdm<N_corrWhen the PRS receiving sequence is in the opportunity, adopting the oversampling rate to receive the PRS receiving sequence in the opportunity;

the processing module 430 is also configured to process the data at N_ifft-ofdm<N_corrAt/2, generating a PRS local sequence of the over-sample band CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence of the over-sampling band CP and the PRS receiving sequence received by adopting the over-sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning.

The user equipment of the embodiment of the invention uses the FFT/IFFT point N which does not change with the PRS bandwidth through the PRS related operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced; and when the bandwidth is small, the PRS local sequence of the over-sampling band CP is generated to perform correlation operation with the receiving sequence, so that the positioning performance under the small bandwidth can be enhanced on the premise of not increasing the IFFT specification.

In the embodiment of the present invention, optionally, the N_corr2048, 1024 or 512.

In this embodiment of the present invention, optionally, the processing module 430 is specifically configured to take the ith segment of the PRS local sequence without CP, where i is an integer, i is greater than or equal to 0 and less than or equal to slice-1, slice is a slice number, and slice =2N_ifft-ofdm/N_corrThe initial position is L_{ind_i}，L_{ind_i}=L_{ind_i-1}+N_corr/2，L_{ind_0}Length of 0, N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_i}，Y_{ind_i}=Y_{ind_i-1}+N_corr/2，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 Length as N in ith slice of PRS local sequence without CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining the PRS local sequence N without CP_corrLong correlation value r (n).

In this embodiment of the present invention, optionally, the processing module 430 is specifically configured to take the 0 th segment of the PRS local sequence with CP, where the start position is zero and the length is N_ifft-ofdm+N_cp，N_cpFor CP Length, add N later_corr-(N_ifft-ofdm+N_cp) Long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X₀(K) (ii) a Taking 0 th segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_cp}，Y_{ind_cp}=Y_{ind_0}-N_cp，Y_{ind_0}For normal sampling without CP from the received sequenceInitial position value of length N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y₀(K) (ii) a Taking IFFT (Conj (X)₀(K))*Y₀(K) First N of (b)_corrThe length of the PRS local sequence N is taken as the length of the CP_corrA long correlation value r (N), 0. ltoreq. n.ltoreq.N_corr/2-1。

In this embodiment of the present invention, optionally, the processing module 430 is specifically configured to take an i-th segment of the PRS local sequence of the oversampled band CP, where i is an integer and 0 ≦ i ≦ slice_cp-1，slice_cpThe number of the slices is the number of the slices,N_upsamplethe initial position is L for the multiple of the oversampling rate_{ind_cp_i}，L_{ind_cp_i}=L_{ind_cp_i-1}+N_corr/2，L_{ind_cp_0}I is not less than 0 and not more than slice_cpWhen-2, length is taken as N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, in i-slice_cpWhen-1, length is taken as N_upsample(N_ifft-ofdm+N_cp)-(slice_cp-1)*N_corrAnd/2, adding a zero sequence to the sequence to form N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by adopting oversampling rate, and setting the starting position as Y_{ind_cp_i}，Y_{ind_cp_i}=Y_{ind_cp_i-1}+N_corr/2，Y_{ind_cp_0}=N_upsample(Y_{ind_0}-N_cp)，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as the length of N in the ith slice of the PRS local sequence of the oversampling band CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining PRS local sequence N of the over-sampling band CP_corrLong correlation value r (n).

The ue 400 according to the embodiment of the present invention may correspond to the ue in the positioning method according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the ue 400 are respectively for implementing corresponding flows of each method in fig. 1 to fig. 3, and are not described herein again for brevity.

The user equipment of the embodiment of the invention uses the FFT/IFFT point N which does not change with the PRS bandwidth through the PRS related operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced.

Fig. 5 shows a schematic block diagram of a user equipment 500 according to another embodiment of the present invention. As shown in fig. 5, the user equipment 500 includes:

a processor 510 for obtaining Fast Fourier Transform (FFT)/fast inverse Fourier transform (IFFT) points N used for Positioning Reference Signal (PRS) correlation operation_corrN of the group_corrIs a predetermined value that does not vary with the PRS bandwidth, and N is_corrLess than or equal to 2048, and obtaining IFFT point number N adopted by orthogonal frequency division multiplexing OFDM symbol corresponding to PRS bandwidth of cell_ifft-ofdm；

Receiver 520 for receiving at N_ifft-ofdm≥N_corrWhen the PRS receiving sequence is in the opportunity, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate;

the processor 510 is also configured to process the data at N_ifft-ofdm≥N_corrAt/2, generating PRS local sequence without cyclic prefix CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning of the observed time difference of arrival.

The user equipment of the embodiment of the invention uses the FFT/IFFT point N which does not change with the PRS bandwidth through the PRS related operation_corrAnd N is_corr2048 is not exceeded, and the requirement of fast correlation on FFT/IFFT resources can be reduced.

Optionally, the receiver 520 is further configured to receive a signal at N_ifft-ofdm<N_corrWhen the PRS receiving sequence is in the opportunity, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate;

the processor 510 is also configured to process the data at N_ifft-ofdm<N_corrAt/2, generating PRS local sequence with CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to acquire the PRS arrival time of the cell and carry out OTDOA positioning.

Optionally, the receiver 520 is further configured to receive a signal at N_ifft-ofdm<N_corrWhen the PRS receiving sequence is in the opportunity, adopting the oversampling rate to receive the PRS receiving sequence in the opportunity;

the processor 510 is also configured to process the data at N_ifft-ofdm<N_corrAt/2, generating a PRS local sequence of the over-sample band CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence of the over-sampling band CP and the PRS receiving sequence received by adopting the over-sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning.

Alternatively, the N_corr2048, 1024 or 512.

Optionally, the processor 510 is specifically configured to take an i-th segment of the PRS local sequence without the CP, where i is an integer, i is greater than or equal to 0 and less than or equal to slice-1, where slice is a slice number, and slice =2N_ifft-ofdm/N_corrThe initial position is L_{ind_i}，L_{ind_i}=L_{ind_i-1}+N_corr/2，L_{ind_0}Length of 0, N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion of long native sequencesObtaining X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_i}，Y_{ind_i}=Y_{ind_i-1}+N_corr/2，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 Length as N in ith slice of PRS local sequence without CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining the PRS local sequence N without CP_corrLong correlation value r (n).

Optionally, the processor 510 is specifically configured to take the 0 th segment of the PRS local sequence with CP, where the start position is zero and the length is N_ifft-ofdm+N_cp，N_cpFor CP Length, add N later_corr-(N_ifft-ofdm+N_cp) Long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X₀(K) (ii) a Taking 0 th segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_cp}，Y_{ind_cp}=Y_{ind_0}-N_cp，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y₀(K) (ii) a Taking IFFT (Conj (X)₀(K))*Y₀(K) First N of (b)_corrThe length of the PRS local sequence N is taken as the length of the CP_corrA long correlation value r (N), 0. ltoreq. n.ltoreq.N_corr/2-1。

Optionally, the processor 510 is specifically configured to take an i-th segment of the PRS local sequence of the oversampled band CP, i is an integer and 0 ≦ i ≦ slice_cp-1，slice_cpThe number of the slices is the number of the slices,N_upsamplethe initial position is L for the multiple of the oversampling rate_{ind_cp_i}，L_{ind_cp_i}=L_{ind_cp_i-1}+N_corr/2，L_{ind_cp_0}I is not less than 0 and not more than slice_cpWhen-2, length is taken as N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, in i-slice_cpWhen-1, length is taken as N_upsample(N_ifft-ofdm+N_cp)-(slice_cp-1)*N_corrAnd/2, adding a zero sequence to the sequence to form N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by adopting oversampling rate, and setting the starting position as Y_{ind_cp_i}，Y_{ind_cp_i}=Y_{ind_cp_i-1}+N_corr/2，Y_{ind_cp_0}=N_upsample(Y_{ind_0}-N_cp)，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as the length of N in the ith slice of the PRS local sequence of the oversampling band CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining PRS local sequence N of the over-sampling band CP_corrLong correlation value r (n).

The ue 500 according to the embodiment of the present invention may correspond to the ue in the positioning method according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the ue 500 are respectively for implementing corresponding flows of each method in fig. 1 to fig. 3, and are not described herein again for brevity.

It should be understood that, in the embodiment of the present invention, the term "and/or" is only one kind of association relation describing an associated object, and means that three kinds of relations may exist. For example, a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (14)

1. A method of positioning, comprising:

fast Fourier Transform (FFT)/fast inverse Fourier transform (IFFT) point number N used for obtaining Positioning Reference Signal (PRS) related operation_corrSaid N is_corrIs a predetermined value that does not vary with the PRS bandwidth, and said N_corrLess than or equal to 2048;

obtaining IFFT point number N adopted by orthogonal frequency division multiplexing OFDM symbol corresponding to PRS bandwidth of cell_ifft-ofdm；

In N_ifft-ofdm≥N_corrWhen the cell is/2, receiving the PRS receiving sequence in the opportunity by adopting a normal sampling rate, generating a PRS local sequence without a Cyclic Prefix (CP) of the cell, and based on the N_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning of the observed time difference of arrival.

2. The method of claim 1, further comprising:

in N_ifft-ofdm<N_corrWhen the cell is/2, receiving the PRS receiving sequence in the opportunity by adopting a normal sampling rate, generating the PRS local sequence with the CP of the cell, and based on the N_corrAnd carrying out correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning.

3. The method of claim 1, further comprising:

in N_ifft-ofdm<N_corrWhen the cell is in the second time, the PRS receiving sequence in the current opportunity is received by adopting the oversampling rate, the PRS local sequence of the oversampling band CP of the cell is generated, and the N is based on the PRS local sequence_corrAnd carrying out correlation operation on the PRS local sequence of the over-sampling band CP and the PRS receiving sequence received by adopting the over-sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning.

4. The method of any one of claims 1 to 3, wherein N is_corr2048, 1024 or 512.

5. The method of claim 1, wherein the basing on the N is based on the N_corrCorrelating the PRS local sequence without the CP with a PRS received sequence received at a normal sampling rate, comprising:

taking the ith segment sequence of the PRS local sequence without the CP, wherein i is an integer and is more than or equal to 0 and less than or equal to slice-1, and slice is the slice number and is 2N_ifft-ofdm/N_corrThe initial position is L_{ind_i}，L_{ind_i}＝L_{ind_i-1}+N_corr/2，L_{ind_0}0, length N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K)；

Taking the ith segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_i}，Y_{ind_i}＝Y_{ind_i-1}+N_corr/2，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K)；

Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as N in the ith slice of the PRS local sequence without CP_corrLong correlation value r_i(n)，0≤n≤N_corr/2-1；

According toObtaining the PRS local sequence N without CP_corrLong correlation value r (n).

6. The method of claim 2, wherein the basing on the N is based on the N_corrPerforming correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate, wherein the correlation operation comprises the following steps:

taking the 0 th segment sequence of the PRS local sequence with the CP, wherein the starting position is zero, and the length is N_ifft-ofdm+N_cp，N_cpFor CP Length, add N later_corr-(N_ifft-ofdm+N_cp) Long sequence of zeros, forming N_corrLong native sequencesIs a reaction of N_corrFFT conversion is carried out on the long local sequence to obtain X₀(K)；

Taking 0 th segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_cp}，Y_{ind_cp}＝Y_{ind_0}-N_cp，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y₀(K)；

Taking IFFT (Conj (X)₀(K))*Y₀(K) First N of (b)_corrThe length of 2 is taken as the PRS local sequence N with the CP_corrA long correlation value r (N), 0. ltoreq. n.ltoreq.N_corr/2-1。

7. The method of claim 3, wherein the N is based on_corrCorrelating the PRS local sequence of the over-sample band CP with a PRS received sequence received at an over-sample rate, comprising:

taking the ith segment sequence of the PRS local sequence of the oversampling band CP, i being an integer and being more than or equal to 0 and less than or equal to slice_cp-1，slice_cpThe number of the slices is the number of the slices,N_upsamplethe initial position is L for the multiple of the oversampling rate_{ind_cp_i}，L_{ind_cp_i}＝L_{ind_cp_i-1}+N_corr/2，L_{ind_cp_0}I is not less than 0 and is not less than slice_cpWhen-2, length is taken as N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, in i-slice_cpWhen-1, length is taken as N_upsample(N_ifft-ofdm+N_cp)-(slice_cp-1)*N_corrAnd/2, adding a zero sequence to the sequence to form N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K)；

Taking the i-th segment of the PRS received sequence received with the over-sampling rateSequence, start position is Y_{ind_cp_i}，Y_{ind_cp_i}＝Y_{ind_cp_i-1}+N_corr/2，Y_{ind_cp_0}＝N_upsample(Y_{ind_0}-N_cp)，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K)；

Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as N in the ith slice of the PRS local sequence of the oversampling band CP_corrLong correlation value r_i(n)，0≤n≤N_corr/2-1；

According toObtaining PRS local sequence N of the oversampling band CP_corrLong correlation value r (n).

8. A user device, comprising:

an obtaining module, configured to obtain FFT/IFFT points N used for PRS correlation operation of positioning reference signals_corrSaid N is_corrIs a predetermined value that does not vary with the PRS bandwidth, and said N_corrLess than or equal to 2048, and obtaining IFFT point number N adopted by orthogonal frequency division multiplexing OFDM symbol corresponding to PRS bandwidth of cell_ifft-ofdm；

A receiving module for receiving at N_ifft-ofdm≥N_corrWhen the PRS receiving sequence is in the opportunity, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate;

a processing module for processing at N_ifft-ofdm≥N_corrAt/2, generating PRS local sequences without Cyclic Prefix (CP) for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence without the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning of the observed time difference of arrival.

9. The UE of claim 8, wherein the receiving module is further configured to receive a message at N_ifft-ofdm<N_corrWhen the PRS receiving sequence is in the opportunity, the PRS receiving sequence in the opportunity is received by adopting a normal sampling rate;

the processing module is further configured to process the data at N_ifft-ofdm<N_corrAt/2, generating PRS local sequence with CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence with the CP and a PRS receiving sequence received by adopting a normal sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning.

10. The UE of claim 8, wherein the receiving module is further configured to receive a message at N_ifft-ofdm<N_corrWhen the PRS receiving sequence is in the opportunity, adopting the oversampling rate to receive the PRS receiving sequence in the opportunity;

the processing module is further configured to process the data at N_ifft-ofdm<N_corrAt/2, generating a PRS local sequence of an oversampled band CP for the cell based on the N_corrAnd carrying out correlation operation on the PRS local sequence of the over-sampling band CP and the PRS receiving sequence received by adopting the over-sampling rate so as to obtain the PRS arrival time of the cell and carry out OTDOA positioning.

11. The UE of any one of claims 8 to 10, wherein N is_corr2048, 1024 or 512.

12. The UE of claim 8, wherein the processing module is specifically configured to take an ith sequence of the PRS local sequence without CP, i is an integer and is greater than or equal to 0 and less than or equal to slice-1, slice is a slice number, and slice is 2N_ifft-ofdm/N_corrThe initial position is L_{ind_i}，L_{ind_i}＝L_{ind_i-1}+N_corr/2，L_{ind_0}0, length N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_i}，Y_{ind_i}＝Y_{ind_i-1}+N_corr/2，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as N in the ith slice of the PRS local sequence without CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining the PRS local sequence N without CP_corrLong correlation value r (n).

13. The UE of claim 9, wherein the processing module is specifically configured to take the 0 th segment of the PRS local sequence with CP, start position is zero, and length is N_ifft-ofdm+N_cp，N_cpFor CP Length, add N later_corr-(N_ifft-ofdm+N_cp) Long sequence of zeros, forming N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X₀(K) (ii) a Taking 0 th segment sequence of PRS receiving sequence received by normal sampling rate, and setting the starting position as Y_{ind_cp}，Y_{ind_cp}＝Y_{ind_0}-N_cp，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y₀(K) (ii) a Taking IFFT (Conj (X)₀(K))*Y₀(K) First N of (b)_corr2 Length as P of said strip CPRS local sequence N_corrA long correlation value r (N), 0. ltoreq. n.ltoreq.N_corr/2-1。

14. The UE of claim 10, wherein the processing module is specifically configured to take an ith segment of the PRS local sequence of the over-sampled strip CP, i being an integer and 0 ≦ i ≦ slice_cp-1，slice_cpThe number of the slices is the number of the slices,N_upsamplethe initial position is L for the multiple of the oversampling rate_{ind_cp_i}，L_{ind_cp_i}＝L_{ind_cp_i-1}+N_corr/2，L_{ind_cp_0}I is not less than 0 and is not less than slice_cpWhen-2, length is taken as N_corr2, adding N later_corrA long sequence of zeros, forming N_corrLong local sequence, in i-slice_cpWhen-1, length is taken as N_upsample(N_ifft-ofdm+N_cp)-(slice_cp-1)*N_corrAnd/2, adding a zero sequence to the sequence to form N_corrLong local sequence, N_corrFFT conversion is carried out on the long local sequence to obtain X_i(K) (ii) a Taking the ith segment sequence of PRS receiving sequence received by adopting oversampling rate, and setting the starting position as Y_{ind_cp_i}，Y_{ind_cp_i}＝Y_{ind_cp_i-1}+N_corr/2，Y_{ind_cp_0}＝N_upsample(Y_{ind_0}-N_cp)，Y_{ind_0}For normal sampling, the initial value of the initial position of the receiving sequence without CP is N_corrForm N_corrLong receive sequence, N_corrFFT conversion is carried out on the long receiving sequence to obtain Y_i(K) (ii) a Taking IFFT (Conj (X)_i(K))*Y_i(K) First N of (b)_corr2 as N in the ith slice of the PRS local sequence of the oversampling band CP_corrLong correlation value r_i(n)，0≤n≤N_corr2-1; according toObtaining PRS local sequence N of the oversampling band CP_corrLong correlation value r (n).