Method for simplifying sounding reference signal and terminal

Abstract

Provided are a method and terminal for simplifying sounding reference signals, the terminal generating an SRS frequency domain sequence of a first antenna port, converting the SRS frequency domain sequence of the first antenna port to an SRS time domain sequence of the first antenna port through inverse fast Fourier transform, and determining the SRS time domain sequence of the first antenna port based on received SRS configuration parameters. And obtaining a time domain shift factor and a first phase twiddle factor corresponding to each second antenna port, converting the SRS time domain sequence of the first antenna port based on the time domain shift factor and the first phase twiddle factor to obtain an SRS time domain sequence of each second antenna port, and then transmitting the SRS time domain sequence. When the sounding reference signals are transmitted by a plurality of antenna ports, only one part of frequency domain signals need to be stored, and only one time of IFFT is needed to realize time domain baseband signals, so that the realization complexity and power consumption are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of new wireless networks, and in particular to a method and a terminal for simplifying detection of reference signals. Background Art

[0002] The fifth generation of mobile communication technology (5G) uses the orthogonal frequency division multiplexing (OFDM) technology adopted by the fourth generation of mobile communication technology (4G). In the 4G / 5G mobile communication system, the uplink also introduces the sounding reference signal (SRS). The 3GPP TS 38.211 protocol is part of the 5G New Radio (NR) physical layer specification, which describes the physical channels and modulation methods in detail. For the sounding reference signal (SRS), the 38.211 standard provides detailed specifications and requirements. The base station (eNodeB) needs to detect the sounding reference signal (SRS) to obtain the channel coefficient, which is used to estimate the uplink channel quality from the UE side to the eNodeB. For the sounding reference signal (SRS) of two antenna ports or four antenna ports, according to the protocol, the frequency domain signal needs to be stored in 2 copies (when 2 antenna ports send SRS) or 4 copies (when 4 antenna ports send SRS), and its time domain baseband signal is implemented through two IFFTs (when 2 antenna ports send SRS) or four IFFTs (when 4 antenna ports send SRS), which increases the implementation complexity and power consumption. Summary of the invention

[0003] Based on the above content, the present invention provides a method and terminal for simplifying sounding reference signal, aiming to solve the technical problems of multiple storage and multiple use of IFFT with high complexity and high power consumption when forming SRS in the prior art.

[0004] A method for simplifying a sounding reference signal, used in a process in which the number of antenna ports for transmitting a sounding reference signal is greater than 1, wherein one antenna port is defined as a first antenna port and the remaining antenna ports are defined as second antenna ports, comprising:

[0005] Step A1: The terminal generates an SRS frequency domain sequence for the first antenna port;

[0006] Step A2: The terminal converts the SRS frequency domain sequence of the first antenna port into an SRS time domain sequence of the first antenna port through inverse fast Fourier transform;

[0007] Step A3: the terminal obtains a first phase rotation factor and a time domain shift factor corresponding to each second antenna port based on the received SRS configuration parameters;

[0008] Step A4: the terminal converts the SRS time domain sequence of the first antenna port based on the time domain shift factor and the first phase rotation factor to obtain an SRS time domain sequence of each second antenna port;

[0009] Step A5: The terminal transmits each formed SRS time domain sequence at the corresponding antenna port.

[0010] Further, in step A3, the first phase rotation factor β i The calculation formula is as follows:

[0011]

[0012] Among them, Δ i is the conversion key factor, which represents the cyclic shift value of the second antenna port The cyclic shift value of the first antenna port The difference between

[0013] In step A3, the time domain shift factor The calculation formula is as follows:

[0014]

[0015] Wherein, i represents the (i+1)th antenna port among the antenna ports identified in sequence;

[0016] N FFT Indicates the number of sample points of the inverse fast Fourier transform;

[0017] K TC Indicates the number of transmission comb teeth;

[0018] Indicates the total number of antenna ports that transmit detection parameter signals;

[0019] Indicates the maximum cyclic shift value.

[0020] Furthermore, before step A1, step A0 is also included: calculating the conversion key factor Δ based on various SRS configuration parameters of the base station in advance. i and the first phase rotation factor β i , forming a signal conversion parameter table;

[0021] In step A3, the terminal obtains the first phase rotation factor β corresponding to each second antenna port by querying the signal conversion parameter table based on the received SRS configuration parameters sent by the base station. i, according to the first phase rotation factor β i The time domain shift factor is calculated

[0022] Further, in step A3, the terminal also obtains a second phase rotation factor based on the received SRS configuration parameter, and the second phase rotation factor The calculation formula is as follows:

[0023]

[0024] in, Indicates the antenna port number p i The starting position of the frequency domain;

[0025] Indicates the frequency domain starting position of the first antenna port number;

[0026] In step A4, the calculation formula for converting to form the SRS time domain sequence of each second antenna port is as follows:

[0027]

[0028] in, Indicates the antenna port number p i The OFDM symbol index is l for the SRS time domain sequence, where n represents the sample index;

[0029] N re Indicates the number of resource units.

[0030] Furthermore, step A4 includes:

[0031] Step A41, performing a cyclic shift on the SRS time domain sequence of the first antenna port based on the time domain shift factor and then performing a first phase rotation based on the first phase rotation factor to obtain an SRS intermediate time domain sequence of the second antenna port;

[0032] Step A42, determining whether the frequency domain starting position of the second antenna port is equal to the frequency domain starting position of the first antenna port sequence number:

[0033] If yes, go to step A43;

[0034] If not, go to step A44;

[0035] Step A43, using the SRS intermediate time domain sequence of the second antenna port as the SRS time domain sequence of the second antenna port;

[0036] Step A44, calculating a second phase rotation factor based on the frequency domain starting position of the second antenna port and the frequency domain starting position of the first antenna port number, and then continuing to step A45, the second phase rotation factor The calculation formula is as follows:

[0037]

[0038] in, Indicates the antenna port number p i The starting position of the frequency domain;

[0039] Indicates the frequency domain starting position of the first antenna port number;

[0040] Step A45: Perform a second phase rotation on the SRS intermediate time domain sequence of the second antenna port based on the second phase rotation factor to obtain the SRS time domain sequence of the second antenna port.

[0041] A terminal, used to execute the aforementioned method for simplifying a sounding reference signal, comprising:

[0042] A frequency domain generation module, used to generate an SRS frequency domain sequence of a first antenna port;

[0043] An inverse Fourier transform module, connected to the frequency domain generation module, configured to transform the SRS frequency domain sequence of the first antenna port into an SRS time domain sequence of the first antenna port through an inverse fast Fourier transform;

[0044] A factor acquisition module, connected to the inverse Fourier transform module, for acquiring a first phase rotation factor and a time domain shift factor corresponding to each second antenna port based on the received SRS configuration parameters;

[0045] A time domain signal generation module, connected to the inverse Fourier transform module and the factor acquisition module, respectively, for transforming the SRS time domain sequence of the first antenna port based on the first phase rotation factor and the time domain shift factor to obtain the SRS time domain sequence of each second antenna port;

[0046] The signal transmission module is respectively connected to the time domain signal generation module and the inverse Fourier transform module, and is used to transmit each formed SRS time domain sequence at a corresponding antenna port.

[0047] Furthermore, the first phase rotation factor β i The calculation formula is as follows:

[0048]

[0049] Among them, Δ i is the conversion key factor, is the cyclic shift value of the second antenna port The cyclic shift value of the first antenna port The difference between

[0050] Time Domain Shift Factor The calculation formula is as follows:

[0051]

[0052] Wherein, i represents the (i+1)th antenna port among the antenna ports identified in sequence;

[0053] N FFT Indicates the number of sample points of the inverse fast Fourier transform;

[0054] K TC Indicates the number of transmission comb teeth;

[0055] Indicates the total number of antenna ports that transmit detection parameter signals;

[0056] Indicates the maximum cyclic shift value.

[0057] Furthermore, it also includes:

[0058] The storage module is used to store the signal conversion parameter table, which is a conversion key factor Δ calculated in advance by the base station based on various SRS configuration parameters. i and the first phase rotation factor β i composition;

[0059] The factor acquisition module is connected to the storage module and is used to obtain the first phase rotation factor β corresponding to each second antenna port by querying the signal conversion parameter table based on the SRS configuration parameters sent by the received base station. i , according to the first phase rotation factor β i The time domain shift factor is calculated

[0060] Furthermore, the factor acquisition module is further used to acquire a second phase rotation factor based on the received SRS configuration parameter, the second phase rotation factor The calculation formula is as follows:

[0061]

[0062] in, Indicates the antenna port number p i The starting position of the frequency domain;

[0063] Indicates the frequency domain starting position of the first antenna port number;

[0064] The calculation formula used by the time domain signal generation module to convert the SRS time domain sequence of each second antenna port is as follows:

[0065]

[0066] in, Indicates the antenna port number p i The OFDM symbol index is l for the SRS time domain sequence, where n represents the sample index;

[0067] N re Indicates the number of resource units.

[0068] Furthermore, the time domain signal generation module includes:

[0069] A cyclic shift unit, used for cyclically shifting the SRS time domain sequence of the first antenna port based on the time domain shift factor;

[0070] A first rotation unit, connected to the cyclic shift unit, is used to perform a first phase rotation based on a first phase rotation factor after the time domain SRS sequence of the first antenna port is cyclically shifted to obtain an SRS intermediate time domain sequence of the second antenna port;

[0071] A judging unit, configured to judge whether a frequency domain starting position of the second antenna port is equal to a frequency domain starting position of the first antenna port sequence number, and obtain a judging result;

[0072] The second rotation unit is connected to the first rotation unit and the judgment unit respectively, and is used to: when the judgment result is not equal, calculate the second phase rotation factor based on the frequency domain starting position of the second antenna port and the frequency domain starting position of the first antenna port sequence number, and perform a second phase rotation on the SRS intermediate time domain sequence of the second antenna port to obtain the SRS time domain sequence of the second antenna port;

[0073] The sequence output unit is connected to the first rotation unit, the judgment unit and the second rotation unit respectively, and is used for:

[0074] When the judgment result is equal, the SRS intermediate time domain sequence of the second antenna port is output as the SRS time domain sequence of the second antenna port;

[0075] When the judgment result is unequal, outputting the SRS time domain sequence of the second antenna port calculated by the second rotation unit;

[0076] Among them, the second phase rotation factor The calculation formula is as follows:

[0077]

[0078] in, Indicates the antenna port number p i The starting position of the frequency domain;

[0079] Indicates the frequency domain starting position of the first antenna port number.

[0080] The beneficial technical effect of the present invention is that for the detection reference signal of two antenna ports or four antenna ports, the present invention only needs to store one copy of its frequency domain signal, and the time domain baseband signal only needs one IFFT implementation, which reduces the implementation complexity and power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1-2 A flowchart of a method for simplifying detection of reference signals according to the present invention;

[0082] Figure 3-4 The figure is a schematic diagram of a module of a terminal according to the present invention. DETAILED DESCRIPTION

[0083] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0084] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0085] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0086] The description of the SRS sounding reference signal in the 3GPP TS 38.211 protocol is as follows:

[0087]

[0088] Indicates the total number of subcarriers occupied by SRS;

[0089] p i The antenna port number of the i+1th antenna port;

[0090] l represents the OFDM symbol index, OFDM symbol number within the SRS resource;

[0091]

[0092] Indicates the number of SRS symbols in a time slot, the number of consecutive OFDM symbols per hop;

[0093] Indicates that the antenna port number is p i The baseband signal of the symbol with OFDM symbol index 1;

[0094] The calculation formula of δ is as follows:

[0095] δ=log2(K TC )

[0096] K TC The transmission comb number indicates the compression factor of the SRS symbol in the time domain and also determines the distribution density of the SRS symbol in the frequency domain.

[0097] α i Represents the cyclic shift parameter, which is calculated as follows:

[0098]

[0099] p i ∈{1000,1001,1002,1003}

[0100] in,

[0101] represents the cyclic shift value of the i+1th antenna port;

[0102] Represents the maximum number of cyclic shifts;

[0103] Indicates the initial cyclic shift configured by the higher-level parameters;

[0104] Indicates the number of antenna ports for transmitting sounding reference signals, the number of antenna ports;

[0105] That is, for four antenna ports and K TC =8 corresponding Corresponding to the two antenna ports There is the following relationship, Configured by signaling, the dressing factor K TC and See the table below:

[0106]

[0107] In the present invention, the cyclic shift parameter α corresponding to antenna port i is i It can be transformed into the following formula 1:

[0108]

[0109] Then in the present invention, the baseband signal of symbol number 1 is expressed as the following formula 2:

[0110]

[0111] in:

[0112] u represents the sequence group of ZC sequence (Zadoff-Chu sequence), sequence group;

[0113] v represents the sequence number within the sequence group of the ZC sequence (Zadoff-Chu sequence);

[0114] This is the basic baseband sequence, which is usually generated by a pseudo-random sequence according to u and v configured by high-level parameters.

[0115] In the description of u and v in the 3GPP TS 38.211 protocol, the calculation formula of sequence group u is as follows:

[0116]

[0117] The SRS sequence identity is the SRS sequence identifier, which is determined by high-level parameters and has a value range that depends on the IE (Information Element) used.

[0118] If it is SRS-PosResource-r16 IE, then:

[0119]

[0120] If it is an SRS-Resource IE, then:

[0121]

[0122] is the frequency hopping function, represents the index of the current subframe, taking into account the subcarrier spacing μ.

[0123] The sequence number v in the group depends on the high-level parameter groupOrSequenceHopping, which can be set in theSRS-Resource IE or the SRS-PosResource IE. If groupOrSequenceHopping is equal to neither, group hopping and sequence hopping are not used. If groupOrSequenceHopping is equal to groupHopping, group hopping is used but sequence hopping is not used. If groupOrSequenceHopping is equal to sequenceHopping, group hopping is not used but sequence hopping is used. According to the calculation of v for the hopping function and the sequence number in the group for these three situations described in the 3GPP TS 38.211 protocol, it can be seen that for symbol number l, the SRS frequency domain sequence of different antenna ports is just the phase exp(jα in formula 2) i n) Different.

[0124] The 3GPP TS 38.211 protocol also describes that after the SRS frequency domain sequence is obtained, frequency domain resource mapping is performed, that is, K TC Map it to the frequency domain subcarrier for interval combing. The relevant calculation formula 3 is as follows:

[0125]

[0126] in,

[0127] Indicates the antenna port number p i The lth OFDM symbol is SRS value on subcarriers;

[0128] Indicates the total number of antenna ports used by the sounding reference signal;

[0129] β SRS Represents the amplitude scaling factor, which is used to adjust the transmit power.

[0130] Ensure that the transmission power of SRS meets the regulatory requirements;

[0131] Indicates that the generated antenna port number is p i The baseband signal with symbol index l;

[0132] Indicates the total number of subcarriers occupied by SRS;

[0133] Indicates the number of SRS symbols in a time slot, the number of consecutive OFDM symbols per hop;

[0134] Indicates the antenna port number p i The frequency-domain starting position; The calculation formula is:

[0135]

[0136] Indicates the antenna port number p i The basic frequency domain starting position is calculated as:

[0137]

[0138] Indicates the antenna port number p i The comb structure offset is calculated as:

[0139]

[0140] equal The condition is if:

[0141]

[0142] equal The condition is if:

[0143]

[0144] equal The condition is: otherwise.

[0145] It is an integer representing the basic comb structure offset of SRS in the frequency domain. Its value is usually configured by high-level parameters (such as RRC signaling) to determine the starting position of SRS in the frequency domain.

[0146] n shift Indicates the initial offset of the starting position of the frequency domain;

[0147] Indicates the number of subcarriers in a resource block (RB);

[0148] Indicates the frequency domain offset at the symbol level.

[0149] Indicates the frequency hopping offset, and the calculation formula is as follows:

[0150]

[0151] B SRS Usually configured by higher-level parameters (such as RRC signaling), m SRS,b and n b Obtained by looking up the table.

[0152] Indicates the frequency domain offset of the resource pool. The calculation formula is as follows:

[0153]

[0154] k F ∈{0,1,…,P F -1}, k F Configured by high-level parameters, it indicates the additional offset of the frequency domain starting position. If not configured, it is 0. F Represents the frequency domain bandwidth scaling factor.

[0155] k hop This parameter is configured by a high-level parameter. If not configured, it is 0.

[0156] From the protocol description, it can be seen that for symbol number l, for the SRS of two antenna ports and four antenna ports in some cases, the SRS of each antenna port occupies the same frequency domain subcarrier; in some cases, for the SRS of four antenna ports, there is a fixed deviation between the frequency domain subcarriers occupied by the SRS of the even antenna ports and the SRS of the odd antenna ports.

[0157] After mapping the frequency domain resources, the IFFT transforms them into time domain signals:

[0158]

[0159] Indicates the antenna port number p i SRS time domain sequence of symbol index l;

[0160] N FFT Indicates the number of IFFT points.

[0161] N re Indicates the number of frequency domain resource units RE.

[0162] According to the prior art, an SRS frequency domain sequence is generated for each antenna port, and an IFFT operation is performed to obtain an SRS time domain sequence for each antenna port, that is, multiple IFFT operations are performed.

[0163] For two antenna ports, the distance between the antenna ports As shown in the following table:

[0164]

[0165]

[0166]

[0167]

[0168]

[0169]

[0170] For four antenna ports, the distance between antenna ports As shown in the following table:

[0171]

[0172]

[0173]

[0174]

[0175]

[0176]

[0177] It can be seen that the and antenna port 0 (the first antenna port of the present invention) The difference between (obtaining the conversion key factor of the present invention Δ i ) is shown in the following table.

[0178] For two antenna ports:

[0179]

[0180] <![CDATA[Δ1]]> 4 4 4 4 -4 -4 -4 -4 <![CDATA[β1]]> 1 1 1 1 -1 -1 -1 -1

[0181]

[0182] <![CDATA[Δ1]]> 6 6 6 6 6 6 -6 -6 -6 -6 -6 -6 <![CDATA[β1]]> 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1

[0183]

[0184] <![CDATA[Δ1]]> 3 3 3 -3 -3 -3 <![CDATA[β1]]> 1 1 1 -1 -1 -1

[0185] For four antenna ports:

[0186]

[0187] <![CDATA[Δ1]]> 2 2 2 2 2 2 -6 -6 <![CDATA[β1]]> 1 1 1 1 1 1 -3 -3 <![CDATA[Δ2]]> 4 4 4 4 -4 -4 -4 -4 <![CDATA[β2]]> 2 2 2 2 -2 -2 -2 -2 <![CDATA[Δ3]]> 6 6 -2 -2 -2 -2 -2 -2 <![CDATA[β3]]> 3 3 -1 -1 -1 -1 -1 -1

[0188]

[0189] <![CDATA[Δ1]]> 3 3 3 3 3 3 3 3 3 -9 -9 -9 <![CDATA[β1]]> 1 1 1 1 1 1 1 1 1 -3 -3 -3 <![CDATA[Δ2]]> 6 6 6 6 6 6 -6 -6 -6 -6 -6 -6 <![CDATA[β2]]> 2 2 2 2 2 2 -2 -2 -2 -2 -2 -2 <![CDATA[Δ3]]> 9 9 9 -3 -3 -3 -3 -3 -3 -3 -3 -3 <![CDATA[β3]]> 3 3 3 -1 -1 -1 -1 -1 -1 -1 -1 -1

[0190]

[0191] <![CDATA[Δ1]]> 0 0 0 0 0 0 <![CDATA[β1]]> 0 0 0 0 0 0 <![CDATA[Δ2]]> 3 3 3 -3 -3 -3 <![CDATA[β2]]> 1 1 1 -1 -1 -1 <![CDATA[Δ3]]> 3 3 3 -3 -3 -3 <![CDATA[β3]]> 1 1 1 -1 -1 -1

[0192] in,

[0193]

[0194] The present invention continues to rewrite Formula 1 as shown below.

[0195] For each second antenna port, ie, i>0, the above formula 1 of the present invention is:

[0196]

[0197] Formula 1 can be rewritten as Formula 4:

[0198]

[0199] Formula 3 is further rewritten into Formula 5:

[0200]

[0201] The SRS baseband signal corresponding to the first antenna port (i.e., i is 0) is expressed as Formula 6:

[0202]

[0203] The SRS baseband signal corresponding to each second antenna port (i is greater than 0) is expressed as Formula 7:

[0204]

[0205] First consider In the case of resource mapping, the SRS frequency domain sequence corresponding to each second antenna port is rewritten as:

[0206]

[0207] k=K TC n+k0

[0208] Further rewritten into formula 8:

[0209]

[0210] make

[0211]

[0212] The SRS time domain sequence of the first antenna port is as described in the following formula 9:

[0213]

[0214] The SRS time domain sequence of the second antenna port is rewritten according to the following formula:

[0215]

[0216]

[0217] The final result of the SRS time domain sequence of the second antenna port is as shown in the following formula 10:

[0218]

[0219] if make According to the FFT property, frequency domain cyclic shift is equivalent to time domain phase rotation, that is, the SRS time domain sequence of the second antenna port is expressed by the following formula 11:

[0220]

[0221] refer to Figure 1 The present invention provides a method for simplifying a sounding reference signal, which is used in a process where the number of antenna ports for transmitting a sounding reference signal is greater than 1, wherein one antenna port is defined as a first antenna port and the remaining antenna ports are defined as second antenna ports, including:

[0222] Step A1: The terminal generates an SRS frequency domain sequence for the first antenna port;

[0223] Step A2: The terminal converts the SRS frequency domain sequence of the first antenna port into an SRS time domain sequence of the first antenna port through inverse fast Fourier transform;

[0224] Step A3: the terminal obtains a first phase rotation factor and a time domain shift factor corresponding to each second antenna port based on the received SRS configuration parameters;

[0225] Step A4: the terminal converts the SRS time domain sequence of the first antenna port based on the first phase rotation factor and the time domain shift factor to obtain an SRS time domain sequence of each second antenna port;

[0226] Step A5: The terminal transmits each formed SRS time domain sequence at the corresponding antenna port.

[0227] Specifically, the SRS frequency domain sequence of the first antenna port is formed based on the SRS configuration parameters.

[0228] Specifically, the number of antenna ports is 2 antenna ports or 4 antenna ports.

[0229] For the detection reference signal of two antenna ports or four antenna ports, the present invention only needs to store one copy of its frequency domain signal, and the time domain baseband signal only needs one IFFT implementation, which reduces the implementation complexity and power consumption.

[0230] Further, in step A3, the first phase rotation factor β i The calculation formula is as follows:

[0231]

[0232] Among them, Δ i is the conversion key factor, which represents the cyclic shift value of the second antenna port The cyclic shift value of the first antenna port The difference between

[0233] In step A3, the time domain shift factor The calculation formula is as follows:

[0234]

[0235] Wherein, i represents the (i+1)th antenna port among the antenna ports identified in sequence;

[0236] N FFT Indicates the number of sample points of the inverse fast Fourier transform;

[0237] K TC Indicates the number of transmission comb teeth;

[0238] Indicates the total number of antenna ports that transmit detection parameter signals;

[0239] Indicates the maximum cyclic shift value.

[0240] Furthermore, before step A1, step A0 is also included: calculating the conversion key factor Δ based on various SRS configuration parameters of the base station in advance. i and the first phase rotation factor β i , forming a signal conversion parameter table;

[0241] In step A3, the terminal obtains the first phase rotation factor β corresponding to each second antenna port by querying the signal conversion parameter table based on the received SRS configuration parameters sent by the base station. i, according to the first phase rotation factor β i The time domain shift factor is calculated

[0242] Conversion key factor Δ i The first phase rotation factor is related to the number of transmission comb teeth and the cyclic shift value. Different SRS configuration parameters, that is, different combinations of the number of antenna ports, the number of transmission comb teeth, and the cyclic shift value, each combination has a corresponding first phase rotation factor and a conversion key factor Δ i and the number of transmission comb teeth, first calculate the first phase rotation factor and conversion key factor Δ under these combinations i The transmission comb number is stored in a table, and then the SRS time domain sequence of the second antenna port is directly queried in the table in the time domain conversion, which can improve the efficiency of generating SRS signals, reduce the amount of calculation, and further reduce the power consumption of the device. Specifically, the conversion key factor Δ under each SRS configuration parameter can be stored in the signal conversion parameter table i In actual use, the conversion key factor Δ is obtained by looking up the table i Then, according to the first phase rotation factor β i The first phase rotation factor β is calculated by the calculation formula i .

[0243] Further, in step A3, the terminal also obtains a second phase rotation factor based on the received SRS configuration parameter, and the second phase rotation factor The calculation formula is as follows:

[0244]

[0245] in, Indicates the antenna port number p i The starting position of the frequency domain;

[0246] Indicates the frequency domain starting position of the first antenna port number;

[0247] In step A4, the calculation formula for converting to form the SRS time domain sequence of each second antenna port is as follows:

[0248]

[0249] in, Indicates the antenna port number p i The OFDM symbol index is l for the SRS time domain sequence, where n represents the sample index;

[0250] N re Indicates the number of resource units.

[0251] As an embodiment of the present invention, if Zero and Equal, then The result is 1, which does not affect the previous calculation results. Therefore, as a preferred method, this formula 11 can be used directly for calculation.

[0252] refer to Figure 2 , further, step A4 includes:

[0253] Step A41, performing a cyclic shift on the SRS time domain sequence of the first antenna port based on the time domain shift factor and then performing a first phase rotation based on the first phase rotation factor to obtain an SRS intermediate time domain sequence of the second antenna port;

[0254] Step A42, determining whether the frequency domain starting position of the second antenna port is equal to the frequency domain starting position of the first antenna port sequence number:

[0255] If yes, go to step A43;

[0256] If not, go to step A44;

[0257] Step A43, using the SRS intermediate time domain sequence of the second antenna port as the SRS time domain sequence of the second antenna port;

[0258] Step A44, calculating a second phase rotation factor based on the frequency domain starting position of the second antenna port number and the frequency domain starting position of the first antenna port number, and then continuing to step A45, the second phase rotation factor The calculation formula is as follows:

[0259]

[0260] in, Indicates the antenna port number p i The starting position of the frequency domain;

[0261] Indicates the frequency domain starting position of the first antenna port number;

[0262] Step A45: Perform a second phase rotation on the SRS intermediate time domain sequence of the second antenna port based on the second phase rotation factor to obtain the SRS time domain sequence of the second antenna port.

[0263] The calculation formula for converting to form the SRS time domain sequence of each second antenna port is shown in Formula 11.

[0264] As another preferred embodiment of the present invention, in order to further reduce the amount of calculation and reduce the number of jobs, first determine and Are they equal? ​​If they are equal, then only the cyclic shift and the first phase rotation need to be calculated to obtain the SRS time domain sequence, reducing the subsequent second phase rotation calculation, that is, the above formula 10 is used for calculation. and If they are not equal, the second phase rotation is further performed on the result of the cyclic shift and the first phase rotation, that is, the calculation is performed using the above formula 11. This can further save the amount of calculation.

[0265] refer to Figure 3 The present invention also provides a terminal, which is used to execute the aforementioned method for simplifying the sounding reference signal, comprising:

[0266] A frequency domain generation module (1), used to generate an SRS frequency domain sequence of a first antenna port;

[0267] An inverse Fourier transform module (2), connected to the frequency domain generation module (1), configured to transform the SRS frequency domain sequence of the first antenna port into an SRS time domain sequence of the first antenna port by means of an inverse fast Fourier transform;

[0268] A factor acquisition module (3), connected to the inverse Fourier transform module (2), is used to acquire a first phase rotation factor and a time domain shift factor corresponding to each second antenna port based on the received SRS configuration parameters;

[0269] A time domain signal generation module (4) is respectively connected to the inverse Fourier transform module (2) and the factor acquisition module (3), and is used to transform the SRS time domain sequence of the first antenna port based on the first phase rotation factor and the time domain shift factor to obtain the SRS time domain sequence of each second antenna port;

[0270] The signal transmission module (5) is respectively connected to the time domain signal generation module (4) and the Fourier inverse transformation module (2), and is used to transmit each formed SRS time domain sequence at a corresponding antenna port.

[0271] Specifically, the SRS frequency domain sequence of the first antenna port is formed based on the SRS configuration parameters.

[0272] Specifically, the number of antenna ports is 2 antenna ports or 4 antenna ports.

[0273] For the detection reference signal of two antenna ports or four antenna ports, the present invention only needs to store one copy of its frequency domain signal, and the time domain baseband signal only needs one IFFT implementation, which reduces the implementation complexity and power consumption.

[0274] Furthermore, the first phase rotation factor β i The calculation formula is as follows:

[0275]

[0276] Among them, Δ i is the conversion key factor, is the cyclic shift value of the second antenna port The cyclic shift value of the first antenna port The difference between

[0277] Time Domain Shift Factor The calculation formula is as follows:

[0278]

[0279] Wherein, i represents the (i+1)th antenna port among the antenna ports identified in sequence;

[0280] N FFT Indicates the number of sample points of the inverse fast Fourier transform;

[0281] K TC Indicates the number of transmission comb teeth;

[0282] Indicates the total number of antenna ports that transmit detection parameter signals;

[0283] Indicates the maximum cyclic shift value.

[0284] Furthermore, it also includes:

[0285] The storage module (6) is used to store a signal conversion parameter table, wherein the signal conversion parameter table is a conversion key factor Δ calculated in advance by the base station based on various SRS configuration parameters. i and the first phase rotation factor β i composition;

[0286] The factor acquisition module (3) is connected to the storage module (6) and is used to obtain the first phase rotation factor β corresponding to each second antenna port by querying the signal conversion parameter table based on the SRS configuration parameters sent by the received base station. i , according to the first phase rotation factor β i The time domain shift factor is calculated

[0287] Conversion key factor Δ i It is related to the first phase rotation factor, the number of transmission comb teeth, and the cyclic shift value. Different SRS configuration parameters, that is, different combinations of the number of antenna ports, the number of transmission comb teeth, and the cyclic shift value, each combination has a corresponding first phase rotation factor and a conversion key factor Δ i , first calculate the first phase rotation factor and conversion key factor Δ under these combinations iThe table is stored, and then the SRS time domain sequence of the second antenna port is directly queried in the table after time domain conversion, which can improve the efficiency of generating SRS signals, reduce the amount of calculation, and further reduce the power consumption of the device. Specifically, the conversion key factor Δ under each SRS configuration parameter can be stored in the signal conversion parameter table i In actual use, the conversion key factor Δ is obtained by looking up the table i Then, according to the first phase rotation factor β i The first phase rotation factor β is calculated by the calculation formula i .

[0288] Furthermore, the factor acquisition module (3) is also used to acquire a second phase rotation factor based on the received SRS configuration parameter, and the second phase rotation factor The calculation formula is as follows:

[0289]

[0290] in, Indicates the antenna port number p i The starting position of the frequency domain;

[0291] Indicates the frequency domain starting position of the first antenna port number;

[0292] The calculation formula used by the time domain signal generation module (4) to convert and form the SRS time domain sequence of each second antenna port is as follows:

[0293]

[0294] in, Indicates the antenna port number p i The OFDM symbol index is l for the SRS time domain sequence, where n represents the sample index;

[0295] N re Indicates the number of resource units.

[0296] As an embodiment of the present invention, if Zero and Equal, then The result is expressed as 1, which does not affect the previous calculation results. Therefore, as a preferred method, this formula can be used directly for calculation.

[0297] See also Figure 4 , further, the time domain signal generating module (4) comprises:

[0298] A cyclic shift unit (41), used for cyclically shifting the SRS time domain sequence of the first antenna port based on the time domain shift factor;

[0299] A first rotation unit (42) is connected to the cyclic shift unit (41) and is used to perform a first phase rotation based on a first phase rotation factor after performing a cyclic shift on the time domain SRS sequence of the first antenna port, so as to obtain an SRS intermediate time domain sequence of the second antenna port;

[0300] A judging unit (43) is used to judge whether the frequency domain starting position of the second antenna port number is equal to the frequency domain starting position of the first antenna port number, and obtain a judgment result;

[0301] The second rotation unit (44) is connected to the first rotation unit (42) and the judgment unit (43) respectively, and is used to: when the judgment result is not equal, calculate the second phase rotation factor based on the frequency domain starting position of the second antenna port sequence number and the frequency domain starting position of the first antenna port sequence number, and perform a second phase rotation on the SRS intermediate time domain sequence of the second antenna port to obtain the SRS time domain sequence of the second antenna port;

[0302] The sequence output unit (45) is connected to the first rotation unit (42), the judgment unit (43) and the second rotation unit (44) respectively, and is used to:

[0303] When the judgment result is equal, the SRS intermediate time domain sequence of the second antenna port is output as the SRS time domain sequence of the second antenna port;

[0304] When the judgment result is unequal, outputting the SRS time domain sequence of the second antenna port calculated by the second rotation unit (44);

[0305] Among them, the second phase rotation factor The calculation formula is as follows:

[0306]

[0307] in, Indicates the antenna port number p i The starting position of the frequency domain;

[0308] Indicates the frequency domain starting position of the first antenna port number.

[0309] As another preferred embodiment of the present invention, in order to further reduce the amount of calculation and reduce the number of jobs, first determine and Are they equal? ​​If they are equal, then only the cyclic shift and the first phase rotation need to be calculated to obtain the SRS time domain sequence, reducing the subsequent second phase rotation calculation. and If they are not equal, the second phase rotation is further performed on the result of the cyclic shift and the first phase rotation, which can further save the amount of calculation.

[0310] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for simplifying a sounding reference signal, for use in a process in which the number of antenna ports for transmitting the sounding reference signal is greater than 1, wherein one antenna port is defined as a first antenna port and the remaining antenna ports are defined as second antenna ports, characterized in that: include: Step A1: The terminal generates an SRS frequency domain sequence of the first antenna port; Step A2: The terminal converts the SRS frequency domain sequence of the first antenna port into an SRS time domain sequence of the first antenna port through inverse fast Fourier transform; Step A3: The terminal obtains a first phase rotation factor and a time domain shift factor corresponding to each of the second antenna ports based on the received SRS configuration parameters; Step A4: the terminal converts the SRS time domain sequence of the first antenna port based on the time domain shift factor and the first phase rotation factor to obtain an SRS time domain sequence of each second antenna port; Step A5: The terminal transmits each of the formed SRS time domain sequences at the corresponding antenna port.

2. The method for simplifying the sounding reference signal according to claim 1, characterized in that: In step A3, the first phase rotation factor β i The calculation formula is as follows: Among them, Δ i is the conversion key factor, is the cyclic shift value of the second antenna port The cyclic shift value of the first antenna port The difference between In step A3, the time domain shift factor The calculation formula is as follows: Wherein, i represents the (i+1)th antenna port among the antenna ports identified in sequence; N FFT Indicates the number of sample points of the inverse fast Fourier transform; K TC Indicates the number of transmission comb teeth; Indicates the total number of antenna ports that transmit detection parameter signals; Indicates the maximum cyclic shift value.

3. The method for simplifying the sounding reference signal according to claim 2, characterized in that: Before step A1, step A0 is also included: calculating the conversion key factor Δ based on various SRS configuration parameters of the base station in advance. i and the first phase rotation factor β i , forming a signal conversion parameter table; In the step A3, the terminal obtains the first phase rotation factor β corresponding to each second antenna port by querying the signal conversion parameter table based on the received SRS configuration parameter sent by the base station. i , according to the first phase rotation factor β i The time domain shift factor is calculated 4. The method for simplifying the sounding reference signal according to claim 2, characterized in that: In step A3, the terminal further acquires a second phase rotation factor based on the received SRS configuration parameter. The second phase rotation factor The calculation formula is as follows: in, Indicates the antenna port number p i The starting position of the frequency domain; Indicates the frequency domain starting position of the first antenna port number; In the step A4, the calculation formula for converting to form the SRS time domain sequence of each second antenna port is as follows: in, Indicates the antenna port number p i The OFDM symbol index is l for the SRS time domain sequence, where n represents the sample index; N re Indicates the number of resource units.

5. The method for simplifying the sounding reference signal according to claim 2, characterized in that: The step A4 includes: Step A41, performing a cyclic shift on the SRS time domain sequence of the first antenna port based on the time domain shift factor and then performing a first phase rotation based on the first phase rotation factor to obtain an SRS intermediate time domain sequence of the second antenna port; Step A42: determine whether the frequency domain starting position of the second antenna port is equal to the frequency domain starting position of the first antenna port number: If yes, go to step A43; If not, go to step A44; Step A43: Using the SRS intermediate time domain sequence of the second antenna port as the SRS time domain sequence of the second antenna port; Step A44, calculating a second phase rotation factor based on the frequency domain starting position of the second antenna port number and the frequency domain starting position of the first antenna port number, and then continuing to step A45, the second phase rotation factor The calculation formula is as follows: in, Indicates the antenna port number p i The starting position of the frequency domain; Indicates the frequency domain starting position of the first antenna port number; Step A45: Perform a second phase rotation on the SRS intermediate time domain sequence of the second antenna port based on the second phase rotation factor to obtain the SRS time domain sequence of the second antenna port.

6. A terminal, characterized in that: A method for performing a simplified sounding reference signal as claimed in any one of claims 1 to 5, comprising: A frequency domain generation module, used to generate an SRS frequency domain sequence of the first antenna port; an inverse Fourier transform module, connected to the frequency domain generation module, configured to transform the SRS frequency domain sequence of the first antenna port into the SRS time domain sequence of the first antenna port through an inverse fast Fourier transform; A factor acquisition module, connected to the inverse Fourier transform module, configured to acquire a first phase rotation factor and a time domain shift factor corresponding to each of the second antenna ports based on the received SRS configuration parameters; a time domain signal generating module, connected to the inverse Fourier transform module and the factor acquiring module respectively, and configured to transform the SRS time domain sequence of the first antenna port based on the first phase rotation factor and the time domain shift factor to obtain the SRS time domain sequence of each second antenna port; The signal transmission module is respectively connected to the time domain signal generation module and the inverse Fourier transform module, and is used to transmit each of the formed SRS time domain sequences at the corresponding antenna port.

7. A terminal according to claim 6, characterized in that: The first phase rotation factor β i The calculation formula is as follows: Among them, Δ i is the conversion key factor, is the cyclic shift value of the second antenna port The cyclic shift value of the first antenna port The difference between The time domain shift factor The calculation formula is as follows: Wherein, i represents the (i+1)th antenna port among the antenna ports identified in sequence; N FFT Indicates the number of sample points of the inverse fast Fourier transform; K TC Indicates the number of transmission comb teeth; Indicates the total number of antenna ports that transmit detection parameter signals; Indicates the maximum cyclic shift value.

8. A terminal according to claim 7, characterized in that: Also includes: A storage module is used to store a signal conversion parameter table, wherein the signal conversion parameter table is a conversion key factor Δ calculated in advance by the base station based on various SRS configuration parameters. i and the first phase rotation factor β i composition; The factor acquisition module is connected to the storage module, and is used to obtain the first phase rotation factor β corresponding to each second antenna port by querying the signal conversion parameter table based on the received SRS configuration parameter sent by the base station. i , according to the first phase rotation factor β i The time domain shift factor is calculated 9. A terminal according to claim 7, characterized in that: The factor acquisition module is further configured to acquire a second phase rotation factor based on the received SRS configuration parameter, wherein the second phase rotation factor The calculation formula is as follows: in, Indicates the antenna port number p i The starting position of the frequency domain; Indicates the frequency domain starting position of the first antenna port number; The calculation formula used by the time domain signal generation module to convert and form the SRS time domain sequence of each second antenna port is as follows: in, Indicates the antenna port number p i The OFDM symbol index is l for the SRS time domain sequence, where n represents the sample index; N re Indicates the number of resource units.

10. A terminal according to claim 7, characterized in that: The time domain signal generation module includes: a cyclic shift unit, configured to cyclically shift the SRS time domain sequence of the first antenna port based on the time domain shift factor; A first rotation unit, connected to the cyclic shift unit, configured to perform a first phase rotation based on the first phase rotation factor after the time domain SRS sequence of the first antenna port is cyclically shifted, so as to obtain an SRS intermediate time domain sequence of the second antenna port; A judging unit, configured to judge whether a frequency domain starting position of the second antenna port is equal to a frequency domain starting position of a sequence number of the first antenna port, and obtain a judgment result; a second rotation unit, connected to the first rotation unit and the judgment unit, respectively, and configured to: when the judgment result is not equal, calculate a second phase rotation factor based on the frequency domain starting position of the second antenna port and the frequency domain starting position of the first antenna port sequence number, and perform a second phase rotation on the SRS intermediate time domain sequence of the second antenna port to obtain an SRS time domain sequence of the second antenna port; A sequence output unit is connected to the first rotation unit, the judgment unit and the second rotation unit respectively, and is used to: When the judgment result is equal, outputting the SRS intermediate time domain sequence of the second antenna port as the SRS time domain sequence of the second antenna port; When the judgment result is unequal, outputting the SRS time domain sequence of the second antenna port calculated by the second rotation unit; Among them, the second phase rotation factor The calculation formula is as follows: in, Indicates the antenna port number p i The starting position of the frequency domain; Indicates the frequency domain starting position of the first antenna port number.

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