CN115834008B - Sounding reference signal generation method and related equipment - Google Patents

Sounding reference signal generation method and related equipment Download PDF

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CN115834008B
CN115834008B CN202211282875.6A CN202211282875A CN115834008B CN 115834008 B CN115834008 B CN 115834008B CN 202211282875 A CN202211282875 A CN 202211282875A CN 115834008 B CN115834008 B CN 115834008B
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srs
sequence
time domain
ifft
signal
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CN115834008A (en
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周博文
黄宗治
李卫国
刘鑫
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Bailuwei Technology Shanghai Co ltd
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Bailuwei Technology Shanghai Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The present disclosure provides a Sounding Reference Signal (SRS) generation method and related apparatus. The SRS generation method comprises the following steps: receiving SRS configuration parameters from a base station; generating an SRS signal sequence according to the SRS configuration parameters; mapping the SRS signal sequence to an Inverse Fast Fourier Transform (IFFT) input sequence register according to the SRS configuration parameters to obtain an IFFT input sequence; the size of the IFFT input sequence register is the ratio of the number of the preset maximum IFFT conversion points of the system to the number of transmission combs in SRS configuration parameters; performing IFFT on the IFFT input sequence to obtain a first time domain SRS sequence; copying and phase compensating the first time domain SRS sequence to obtain a second time domain SRS sequence; and performing cyclic prefix adding operation on the second time domain SRS sequence to generate an SRS baseband signal. The application can generate the SRS signal with higher bandwidth through the IFFT operation with smaller number, thereby supporting the transmission of the SRS signal with higher bandwidth without increasing the cost of the terminal side, and further supporting various enhanced SRS positioning functions.

Description

Sounding reference signal generation method and related equipment
Technical Field
The disclosure relates to the technical field of wireless communication, and in particular relates to a sounding reference signal generating method and related equipment.
Background
This section is intended to provide a background or context to the embodiments of the disclosure recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The application scenarios of the fifth generation mobile communication technology (5G) can be divided into three major classes, including enhanced mobile broadband (enhanced mobile broadband, eMBB), ultra-high reliability low latency communication (ultra-reliable and low latency communications, uirllc) and mass machine type communication (massive machine type communication, mctc). The eMBB mainly faces to the demands of people on the mobile internet, and the demands comprise mobile phones, high-definition videos, virtual Reality (VR), augmented reality (augmented reality, AR) and the like; uRLLC is mainly oriented to high-performance special applications such as industrial control, internet of vehicles and the like; mctc is a large-scale internet of things deployment and application.
The 5G uses an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology adopted by the fifth generation mobile communication technology (4G). One major advantage of OFDM is that orthogonal subcarriers can be modulated and demodulated using fast fourier transform/inverse fast fourier transform (FFT/IFFT). In addition, in the 5G mobile communication system, a sounding reference signal (Sounding Reference Signal, abbreviated SRS) is also introduced in the uplink. The base station side can estimate the transmission quality of the channel according to the SRS transmitted by the terminal, and can estimate the uplink timing according to the SRS transmitted by the terminal. Thus, SRS is typically applied for positioning.
With the promotion of 5G industrial application, the high power consumption and high cost of 5G modules and terminals are becoming more and more the bottleneck restricting the large-scale popularization of various industries. At the same time, some high performance of 5G modules and terminals is also wasteful in application requirements of some industries, such as speed and the like. Thus, 3GPP proposes a 5G lightweight (also called NRlight) terminal based on a balance of performance and cost in R17. To reduce hardware costs. The 5G lightweight terminal adopts 1T2R antenna configuration (namely 1 transmitting antenna and 2 receiving antennas), and the maximum bandwidth is 20MHz under the Sub-6GHz frequency band. The 5G lightweight terminal is mainly oriented to three typical application scenes of an industrial wireless sensor, video monitoring and wearable equipment, and can be applied to industries and public network consumer users.
Because the maximum bandwidth supported by the 5G lightweight terminal is 20MHz, the uplink of the terminal can only support 20M SRS transmission at the maximum, and therefore, the enhanced SRS positioning function cannot be provided. Currently, this limitation of maximum bandwidth has become one of the bottlenecks in practical applications for 5G lightweight terminals.
Disclosure of Invention
In view of this, the present disclosure proposes an SRS generation method that can generate an SRS signal of a higher bandwidth through an Inverse Fast Fourier Transform (IFFT) operation of a smaller number of points.
The SRS generation method proposed by the embodiment of the present disclosure may include: receiving SRS configuration parameters from a base station; generating an SRS signal sequence according to the SRS configuration parameters; mapping the SRS signal sequence to an IFFT input sequence register according to the SRS configuration parameters to obtain an IFFT input sequence; the size of the IFFT input sequence register is the ratio of the preset maximum system conversion point number to the transmission comb number in the SRS configuration parameter; performing IFFT on the IFFT input sequence to obtain a first time domain SRS sequence; copying and phase compensating the first time domain SRS sequence to obtain a second time domain SRS sequence; and performing cyclic prefix adding operation on the second time domain SRS sequence to generate an SRS baseband signal.
In an embodiment of the disclosure, the mapping the SRS signal sequence onto an IFFT input sequence register according to the SRS configuration parameters includes: determining a sequence splitting parameter according to the initial RE position of the SRS signal sequence frequency domain; splitting the generated SRS signal sequence into a first sequence and a second sequence according to the sequence splitting parameter; wherein the first sequence is denoted S 1 = { S (m), S (m+1), …, S (u) }, the second sequence is denoted S 2 = { s (0), s (1), …, s (m-1) }; wherein u is represented as the length of the SRS signal sequence; m is the sequence splitting parameter; mapping the generated SRS signal sequence to an IFFT input sequence register; wherein the size of the IFFT input sequence register isThe IFFTSize is the preset maximum conversion point number of the system; k (K) TC For the number of transmission combs.
In an embodiment of the disclosure, the determining the sequence splitting parameter according to the starting RE position of the SRS signal sequence frequency domain includes: when (when)Let->Otherwise, let m=0; wherein F is start The initial RE position of the SRS signal sequence frequency domain; BWP represents the frequency domain bandwidth.
In an embodiment of the disclosure, the mapping of the generated SRS signal sequenceThe input sequence register of the IFFT comprises the following steps: in response to determining that m=0, sequence S will be 1 By taking the starting position asSequentially mapping the non-interval parts to the head part of an IFFT input sequence register, and inserting other positions of the IFFT input sequence register into 0; in response to determining that m+.0, sequence S 1 Mapping the initial position of 0 to the head of the IFFT input sequence register sequentially and without interval, and then S 2 Mapped to the tail of the IFFT input sequence register and insert 0's elsewhere in the IFFT input sequence register.
In an embodiment of the present disclosure, replicating and phase compensating the first time domain SRS sequence includes: copying the first time domain SRS sequence, wherein the number of times of copying the first time domain SRS sequence is equal to the transmission comb number; the copied plurality of first time domain SRS sequences are connected in series in the time domain to obtain a first intermediate sequence; and multiplying each element in the first intermediate sequence by a preset first phase shift factor corresponding to the element to obtain the second time domain SRS sequence.
In an embodiment of the present disclosure, wherein the first phase shift factor p 1 (g) The method comprises the following steps:
wherein shift is a preset phase compensation parameter; IFFTSize is the maximum number of conversion points of the system; the parameter g represents the g-th element in the first intermediate sequence.
In an embodiment of the present disclosure, replicating and phase compensating the first time domain SRS sequence includes:
multiplying each element in the first time domain SRS sequence by a preset second phase shift factor corresponding to the element to obtain a second intermediate sequence;
copying the second intermediate sequence, wherein the number of times of copying the second intermediate sequence is equal to the transmission comb number;
Multiplying each element in the second intermediate sequences by a preset third shifting factor corresponding to each second intermediate sequence to obtain a plurality of third intermediate sequences; and
and connecting the plurality of third intermediate sequences in series in the time domain to obtain the second time domain SRS sequence.
In an embodiment of the present disclosure, the second phase shift factor p 2 (n) is:
wherein shift is a preset phase compensation parameter; the parameter n represents the nth element in the first time domain SRS sequence; IFFTSize is the maximum number of conversion points of the system; k (K) TC -a number of said transmission combs;
the third phase shift factor p 3 (k) The method comprises the following steps:
wherein the parameter k represents the kth second intermediate sequence.
In an embodiment of the disclosure, the phase compensation parameter is set according to a starting RE position of the SRS signal sequence frequency domain and the transmission comb number.
In an embodiment of the disclosure, the phase compensation parameter is set according to a starting RE position of the SRS signal sequence frequency domain, the transmission comb number, and a carrier phase.
In an embodiment of the present disclosure, the above method may further include: determining an SRS expected transmission power; determining the power value of the SRS baseband signal according to a preset baseband power gear; and determining a gain gear of radio frequency power control according to the SRS expected transmitting power and the power value of the SRS baseband signal.
The embodiment of the disclosure also provides a terminal, including:
a configuration parameter receiving module, configured to receive sounding reference signal SRS configuration parameters from a base station;
the sequence generation module is used for generating an SRS signal sequence according to the SRS configuration parameters;
the frequency domain mapping module is used for mapping the generated SRS signal sequence to an IFFT input sequence register according to the SRS configuration parameters to obtain an IFFT input sequence; the size of the IFFT input sequence register is the ratio of the number of the preset maximum system conversion points to the number of transmission combs in the SRS configuration parameters;
the transformation module is used for performing IFFT on the IFFT input sequence to obtain a first time domain SRS sequence;
the copying module is used for copying the first time domain SRS sequence and compensating the phase to obtain a second time domain SRS sequence; and
and the baseband signal generation module is used for executing cyclic prefix adding operation on the second time domain SRS sequence to generate an SRS baseband signal.
In an embodiment of the present disclosure, the terminal may further include:
the expected transmission power determining module is used for determining the SRS expected transmission power;
the baseband power control module is used for determining the power value of the SRS baseband signal according to a preset baseband power gear; and
And the radio frequency power control module is used for determining a gain gear of radio frequency power control according to the SRS expected transmitting power and the power value of the SRS baseband signal.
The computer device according to an embodiment of the present disclosure includes:
one or more processors, memory; and
one or more programs;
wherein the one or more programs are stored in the memory and executed by the one or more processors, the programs including instructions for performing the above-described sounding reference signal generation method.
A non-transitory computer-readable storage medium containing a computer program according to an embodiment of the disclosure, which when executed by one or more processors, causes the processors to perform the above-described sounding reference signal generation method.
The computer program product according to the embodiments of the present disclosure includes computer program instructions that, when executed on a computer, cause the computer to perform the above-described sounding reference signal generation method.
As can be seen, in the SRS generating method disclosed in the embodiment of the present disclosure, the number of points of the IFFT used when the terminal side performs the IFFT may be set to be a ratio of the preset maximum number of system transformation points to the number of transmission combs in the SRS configuration parameter. That is, the number of IFFT points used when the terminal side performs IFFT can be reduced to a fraction of the maximum number of conversion points of the system. In this way, the method disclosed by the embodiment of the disclosure can generate the SRS signal with higher bandwidth through the IFFT operation with smaller number of points, so that the transmission of the SRS signal with higher bandwidth is supported without increasing the cost of the terminal side, and thus various enhanced SRS positioning functions are supported.
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In order to more clearly illustrate the technical solutions of the present disclosure or related art, the drawings required for the embodiments or related art description will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 shows a specific method for generating an uplink signal according to an embodiment of the disclosure;
fig. 2A and 2B show examples of SRS time-frequency resource distribution in frequency domain 1RB and time domain 1 slot, respectively;
FIG. 3 illustrates a method of replicating and phase compensating a temporal SRS sequence according to some embodiments of the present disclosure;
FIG. 4 illustrates a method of replicating and phase compensating a temporal SRS sequence according to further embodiments of the present disclosure;
fig. 5 illustrates a method of power control of the SRS according to some embodiments of the disclosure;
fig. 6 illustrates a functional structure of a terminal according to an embodiment of the present disclosure; and
fig. 7 illustrates a hardware structure of an exemplary computer device provided by an embodiment of the present disclosure.
Detailed Description
For purposes of making the objects, technical solutions, and advantages of the present disclosure more apparent, the principle and spirit of the present disclosure will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are presented merely to enable one skilled in the art to better understand and practice the present disclosure and are not intended to limit the scope of the present disclosure in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In this document, it should be understood that any number of elements in the drawings is for illustration and not limitation, and that any naming is used only for distinction and not for any limitation.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in embodiments of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As previously described, since the maximum bandwidth supported by the above 5G lightweight terminal is only 20MHz, that is, at present, the uplink of the terminal can only support 20MHz SRS transmission at maximum, so that the current 5G lightweight terminal cannot provide enhanced SRS positioning function. In view of this, in order to enable a 5G lightweight terminal to also support SRS transmission of 100MHz, thereby providing enhanced SRS positioning function, embodiments of the present disclosure provide a method for generating SRS.
Fig. 1 shows a specific implementation flow of an SRS generation method according to some embodiments of the present disclosure, which may be performed by a 5G lightweight terminal. As shown in fig. 1, the SRS generation method may include:
step 102, receiving SRS configuration parameters from a base station.
Step 104, generating SRS signal sequence according to the received SRS configuration parameters.
Step 106, mapping the generated SRS signal sequence to an IFFT input sequence register according to the received SRS configuration parameters to obtain an IFFT input sequence; the size of the IFFT input sequence register is a ratio of a preset maximum system transform point number to a transmission comb number in the SRS configuration parameter.
Step 108, performing IFFT on the IFFT input sequence to obtain a first time domain SRS sequence.
As can be seen, the length of the IFFT input sequence is a ratio of the number of the preset maximum transform points of the system to the number of transmission combs in the SRS configuration parameters.
In step 110, the first time domain SRS sequence is copied and phase compensated to obtain a second time domain SRS sequence.
In step 112, cyclic prefix operation is performed on the second time domain SRS sequence, and an SRS baseband signal is generated.
After the SRS baseband signal is generated by the above method, the terminal may further modulate the SRS baseband signal, and then send out the modulated radio frequency signal, so as to complete SRS transmission.
As can be seen, in the SRS generating method disclosed in the embodiment of the present disclosure, the number of points of the IFFT used when the terminal side performs the IFFT may be set to be a ratio of the preset maximum number of system transformation points to the number of transmission combs in the SRS configuration parameter. That is, the number of IFFT points used when the terminal side performs IFFT can be reduced to a fraction of the maximum number of conversion points of the system. In this way, the method disclosed by the embodiment of the disclosure can generate the SRS signal with higher bandwidth through the IFFT operation with smaller number of points, so that the transmission of the SRS signal with higher bandwidth is supported without increasing the cost of the terminal side, and thus various enhanced SRS positioning functions are supported.
The specific implementation method of each step in the SRS generation method is described in detail below with further reference to specific examples.
In the 5G mobile communication system, a plurality of SRS Resource sets (ReS) may be configured according to the specifications of the existing 3GPP protocol. Wherein each ReS may contain 1 to multiple SRS resources. Specifically, each SRS resource may include {1,2,4} antenna ports. Further, in the time domain, SRS resources may be allocated in {1,2,4} consecutive symbols among the last 6 OFDM symbols of one Slot (Slot). In the frequency domain, it can be based on the size K of TCN TC Each SRS resource is mapped on a physical resource block in a comb-like manner. Wherein K is TC The value of (2, 4) may be. Fig. 2A and 2B show SRS time-frequency resource distribution examples of frequency domain 1RB and time domain 1 slot, respectively. Wherein FIG. 2A shows the ratio at K TC When the number of symbols occupied by the SRS resource is 1,2 and 4 when the number is equal to 2, the SRS time-frequency resource distribution example of 1RB in the frequency domain and 1 slot in the time domain is shown. FIG. 2B shows the process at K TC And when the number of symbols occupied by the SRS resource is 1,2 and 4, respectively, the SRS time-frequency resource distribution examples of the frequency domain 1RB and the time domain 1 time slot are shown. In the examples of fig. 2A and 2B, REs identified by shading are RE SRS resources occupied by SRS resources. Also, in the above example, the start positions are 0 in 1 RB. In practical applications, the frequency domain offset value of the SRS may be calculated by a high-level configuration. In addition, the SRS also supports 64 SRS bandwidth configurations, wherein the SRS bandwidth is minimum of 4RB and maximum of 272RB. Further, SRS is generally transmitted using ZC sequences as the SRS signal sequences. In this way, different SRS ports may be distinguished from each other by occupying different OFDM symbols Or even if the same OFDM symbol is occupied, it can be distinguished from each other by selecting different frequency domain resources or by different cyclic shifts of ZC sequences. Also, to further enhance the positioning capability of SRS, 3GPP specification release 16 specifies that in the time domain, SRS may be allocated {1,2,4,8,12} consecutive OFDM symbols, and the starting position of the symbols may be at any position within the slot; in the frequency domain, a TCN value of 8 is further added.
As can be seen from the above, in order to implement the SRS generation and transmission process on the terminal side, the base station needs to configure the SRS resources used by each terminal. Specifically, the base station may send SRS configuration parameters of each terminal to each terminal through higher layer signaling. That is, in step 102 described above, the terminal may receive its SRS configuration parameters from the base station through higher layer signaling. In an embodiment of the present disclosure, the SRS configuration parameters may generally include: index C of antenna port, SRS occupying Resource Block (RB) in frequency domain SRS And B SRS OFDM symbol number occupied by SRS in time domain, transmission comb number K TC (Transmission Comb Number, TCN), etc.
After receiving the SRS configuration parameter, in step 104, the terminal may generate an SRS signal sequence according to the received SRS configuration parameter. Specifically, in some embodiments of the present disclosure, the SRS signal sequence may be a ZC sequence. The ZC sequence may be generated by a ZC sequence generation method used in the conventional 5G mobile communication system, and will not be described in detail herein.
After the SRS signal sequence is generated, in step 106, the terminal needs to map the generated SRS signal sequence to the IFFT input sequence register.
Specifically, in the embodiment of the present disclosure, the mapping the generated SRS signal sequence to the IFFT input sequence register may specifically include:
first, a sequence splitting parameter is determined according to a starting Resource Element (RE) position of an SRS signal sequence frequency domain.
In the embodiments of the present disclosure, the starting RE position of the SRS signal sequence frequency domain may be determined according to the SRS configuration parameter by a method specified by the existing 3GPP protocol, which is not described in detail herein.
Further, in an embodiment of the present disclosure, the sequence splitting parameter refers to one intermediate parameter used when splitting the SRS signal sequence into two sequences in a subsequent step. Specifically, the above sequence splitting parameter m may be determined by: when (when)Let->Otherwise, let m=0. Wherein F is start For the initial RE position of the SRS signal sequence frequency domain, BWP represents the frequency domain bandwidth; k (K) TC For transmitting the number of combs.
Secondly, splitting the generated SRS signal sequence into a first sequence and a second sequence according to the determined sequence splitting parameter, wherein the first sequence is expressed as S 1 = { S (m), S (m+1), …, S (u) }, the second sequence is denoted S 2 = { s (0), s (1), …, s (m-1) }; wherein u is represented as the length of the SRS signal sequence; m is the sequence splitting parameter.
The generated SRS signal sequence is then mapped onto an IFFT input sequence register. Wherein the size of the IFFT input sequence register is the preset maximum conversion point IFFTSize of the system and the transmission comb number K in SRS configuration parameters TC Ratio of (2)
In an embodiment of the present disclosure, the mapping the generated SRS signal sequence onto the IFFT input sequence register may specifically include: if m=0, i.e. there is no S 2 When it is, sequence S 1 By taking the starting position asSequentially mapping to the head of the IFFT_IN without interval, and inserting 0 at other positions of the IFFT_IN. Wherein,,ifft_in is represented as an IFFT input sequence register. If m is not equal to 0, S is present 2 Will sequence S 1 Mapping to IFFT_IN header sequentially and without interval with initial position of 0, and then mapping S 2 Mapped to the tail of ifft_in, and 0 is inserted at other positions of ifft_in.
It can be seen that the length of the frequency domain ifft_in sequence obtained by the mapping method isCompared with the traditional comb mapping mode, the method reduces K TC Multiple times.
After the above-mentioned resource mapping is completed, in step 108, the first time domain SRS sequence is obtained through IFFT. It can be seen that in the step 108, the number of points of the IFFT is set to be a ratio of a preset maximum number of conversion points of the system to the number of transmission combs.
Specifically, in the embodiment of the present disclosure, the above-described system maximum transform point number refers to the point number of the maximum IFFT that the terminal needs to employ in supporting the system target SRS bandwidth. And the system target SRS bandwidth refers to the SRS bandwidth required to implement the SRS positioning function or the enhanced SRS positioning function. It is known that the maximum conversion point number of the system is related to the target SRS bandwidth of the 5G mobile communication system. For example, in order to implement the enhanced SRS positioning function, the target SRS bandwidth of the 5G mobile communication system should generally reach 100MHz. In the case of supporting the above-mentioned target SRS bandwidth of 100MHz, the number of points of maximum IFFT to be employed by the terminal will reach 4096. It can also be said that, in the case where the target SRS bandwidth is 100MHz, the number of maximum conversion points of the system should be set to 4096. As mentioned above, if the terminal is required to support the IFFT with 4096 points and the corresponding storage capability, the hardware cost of the terminal tends to be high, and the current 5G lightweight terminal cannot support the IFFT with such multiple points and the corresponding storage capability.
As mentioned above, in the step 108, the number of IFFT performed by the terminal according to the embodiment of the present disclosure is the ratio of the maximum number of transform points of the system to the number of transmission combs. Meanwhile, it is known that in the 5G mobile communication system, the transmission comb number is usually 2 or 4, and may even be 8. That is, in the scheme of the present application, the number of IFFT adopted by the terminal may be reduced by one half or one fourth of the maximum conversion number of the system, or even one eighth of the maximum conversion number of the system. For example, if the set maximum transform point number of the system is 4096, the point number of IFFT performed by the terminal may be reduced to 2048, 1024, or even 512 in the embodiment of the present disclosure. Therefore, the scale of the terminal-side IFFT operation can be greatly reduced, so that the method can be completely suitable for the current 5G lightweight terminal without increasing the hardware cost of the 5G lightweight terminal.
However, since the number of IFFT used in step 108 is the ratio of the maximum transform number of the system to the number of transmission combs, the length of the time domain SRS obtained by the IFFT will be the ratio of the length of the time domain SRS required by the system to the number of transmission combs, i.e. one half or one quarter, or even one eighth, of the length of the time domain SRS required by the system. Therefore, in this step 110, the time domain SRS sequence obtained in step 108 needs to be processed to lengthen the time domain SRS sequence. Specifically, the terminal may copy the first time domain SRS sequence into a plurality of sequences and concatenate the sequences together. At this time, the number of the copied first time domain SRS sequences should be the same as the transmission comb number, so that the total length of the copied time domain SRS sequences can reach the maximum number of conversion points of the system.
In addition, through the above step 106, when the generated SRS sequence is mapped to the IFFT input sequence register, since the SRS resource has a starting position of the frequency domain on the frequency domain Bandwidth (BWP) of the terminal, only performing the small-scale IFFT may cause a phase change, and thus, before, during or after copying the above time domain SRS sequence, phase compensation is further required for the copied time domain SRS sequence to compensate for the phase change introduced during the operation of step 106. In some embodiments, the phase compensation parameter for performing phase compensation may be set according to the starting RE position of the SRS signal sequence frequency domain and the transmission comb number. In other embodiments, the phase compensation parameter may be further set according to the carrier phase, in addition to the starting position of the frequency domain and the number of transmission combs.
Specifically, in some embodiments of the present disclosure, the above-described phase compensation parameter may be set by the following method: corresponding to the mapping manner of mapping the generated SRS signal sequence onto the frequency domain resource according to the embodiment of the present disclosure, the phase compensation parameter is also divided into two cases: if there is no S 2 Time, frequency domain start position F start Exceeds that ofThe phase compensation parameter is expressed as the frequency domain starting position F start And->Difference value pair K TC And (5) solving the remainder. If S is present 2 Frequency domain starting position F start Not exceed->The phase compensation parameter is denoted +.>And a frequency domain start position F start Difference value pair K TC Solving the remainder, and adding K TC 。
The embodiments of the present disclosure also provide various specific methods for copying and phase compensating the above-mentioned time domain SRS sequences.
Fig. 3 illustrates a specific method for copying and phase compensating a temporal SRS sequence according to some embodiments of the present disclosure. As shown in fig. 3, the method includes:
in step 302, the first time domain SRS sequence is copied, where the number of the copied first time domain SRS sequences is equal to the number of transmission combs, which may be said to be the same as the number of the first time domain SRS sequences.
In these embodiments, assuming that the first time domain is S (n), the copied first time domain SRS sequences are respectively Wherein K is TC For transmitting the number of combs.
In step 304, the copied plurality of first time domain SRS sequences are concatenated in the time domain to obtain a first intermediate sequence.
Specifically, in some embodiments, the first intermediate sequence may be represented as the following expression:
the IFFTSize is the maximum conversion point number of the system; the parameter g represents the g-th element in the first intermediate sequence.
In step 306, each element in the first intermediate sequence is multiplied by a preset first phase shift factor corresponding to itself, so as to obtain a second time domain SRS sequence.
In an embodiment of the present disclosure, the first phase shift factor p 1 (g) Can be set as an expression that the first phase shift factor p is due to the length of the first intermediate sequence being IFFTSize 1 (g) There are also IFFTSize:
wherein shift is a phase compensation parameter set in advance.
It can be seen that the second time domain SRS sequence with the length of the system maximum transform point IFFTSize can be obtained through the steps 302 to 306.
Fig. 4 illustrates methods of copying and phase compensating a temporal SRS sequence according to further embodiments of the present disclosure. As shown in fig. 4, the method includes:
in step 402, each element in the first time domain SRS sequence is multiplied by a second phase shift factor corresponding to itself, which is preset, to obtain a second intermediate sequence.
In the present disclosureIn an open embodiment, the second phase shift factor p 2 (n) can be set as an expression as follows, since the length of the first time-domain SRS sequence isThus, the second phase shift factor p 2 (n) also has->The following steps:
wherein shift is a preset phase compensation parameter; the parameter n represents the nth element in the first time domain SRS sequence.
In step 404, the second intermediate sequences are duplicated, where the number of duplicated second intermediate sequences is equal to the number of transmission combs, which may be said to be the same as the number of transmission combs.
In step 406, each element in the second intermediate sequences is multiplied by a preset third shifting factor corresponding to each second intermediate sequence, so as to obtain a plurality of third intermediate sequences.
In an embodiment of the present disclosure, the third phase shift factor p 3 (k) Can be set as an expression in which the above second intermediate sequences share K TC Accordingly, the third phase shift factor p 3 (k) Also have K TC The following steps:
wherein shift is a preset phase compensation parameter; the parameter k represents the kth second intermediate sequence.
In step 408, the third intermediate sequences are concatenated in the time domain to obtain a second time domain SRS sequence.
It can be seen that the second time domain SRS sequence with the length of the system maximum transform point IFFTSize can also be obtained through the steps 402 to 408.
In addition, in the embodiment of the present disclosure, in the step 112, the terminal may perform the cyclic prefix adding operation on the second time domain SRS sequence using the cyclic prefix adding (CP) operation used in the existing 5G mobile communication system, which will not be described in detail herein.
As can be seen from the above method, in the SRS generation method disclosed in the embodiment of the present disclosure, the terminal side may use onlyThe IFFT of the point can generate a time domain SRS sequence of length IFFTSize. By the method, on one hand, the terminal can generate SRS with the maximum bandwidth reaching 100MHz, so that the terminal can support various enhanced SRS positioning functions; on the other hand, the method can be suitable for the current 5G lightweight terminal without supporting IFFT size point IFFT operation and related storage capacity of the terminal and increasing hardware cost of the 5G lightweight terminal.
It will be appreciated that, in addition to the cost of controlling the terminal, power control is typically performed for a 5G lightweight terminal, so as to further reduce power consumption of the terminal and extend standby time of the 5G lightweight terminal. For this reason, the embodiments of the present disclosure further propose a power control method at the terminal side on the basis of the SRS generation and transmission method described above. Fig. 5 illustrates a method of power control of the SRS according to some embodiments of the disclosure. As shown in fig. 5, the method may include:
In step 502, the SRS desired transmit power is determined.
In embodiments of the present disclosure, the terminal may determine the SRS desired transmission power according to the specification of the new air interface 3GPP specification, which is not described in detail herein.
In step 504, a power value of the SRS baseband signal is determined according to the preset baseband power gear.
In an embodiment of the present disclosure, the baseband power stage may be set according to a peak-to-average ratio (Peak to Average Power Ratio, PAPR) of the SRS baseband signal. Wherein, the baseband power range can be set to 0-PAPR. If the preset baseband power gear is 0, the power adjustment value of the SRS baseband signal is 0dB; if the preset baseband power gear is PAPR, the power adjustment value of the SRS baseband signal is PAPR dB. In addition, in the embodiment of the present disclosure, when each gain gear of the radio frequency power control is known, the "difference value between the expected SRS transmission power and the radio frequency power control gear" may be further added on the basis of the determined power value of the SRS baseband signal, so as to ensure accuracy of the SRS signal power sent by the air interface.
In step 506, a gain stage for radio frequency power control is determined based on the SRS desired transmit power and the power value of the SRS baseband signal.
The gain stage of the radio frequency power control may be a difference between the SRS expected transmit power and the SRS baseband signal power value.
As can be seen from the above method, the SRS power control method provided by the embodiment of the present disclosure mainly includes two parts, namely baseband power control and radio frequency power control, and achieves the purpose of reducing the gain range of the radio frequency power control by increasing the power value of the SRS baseband signal, thereby achieving the purpose of reducing the power consumption of the terminal side.
Based on the same inventive concept, the present disclosure also provides a terminal corresponding to the method of any embodiment. Fig. 6 shows a functional structure of a terminal according to an embodiment of the present disclosure. As shown in fig. 6, the terminal includes:
a configuration parameter receiving module 602, configured to receive SRS configuration parameters from a base station;
a sequence generating module 604, configured to generate an SRS signal sequence according to the received SRS configuration parameter;
the frequency domain mapping module 606 is configured to map the generated SRS signal sequence onto an IFFT input sequence register according to the received SRS configuration parameter, to obtain an IFFT input sequence; the size of the IFFT input sequence register is the ratio of the preset maximum system conversion point number to the transmission comb number in the SRS configuration parameter;
A transform module 608, configured to perform IFFT on the IFFT input sequence to obtain a first time domain SRS sequence;
a replication module 610, configured to replicate the first time domain SRS sequence and perform phase compensation to obtain a second time domain SRS sequence; and
the baseband signal generating module 612 is configured to perform cyclic prefix adding operation on the second time domain SRS sequence, and generate an SRS baseband signal.
The above terminal may further include:
the modulation module is used for modulating the SRS baseband signal; and
and the transmitting module is used for transmitting the modulated radio frequency signals.
In addition, the terminal may further include:
the expected transmission power determining module is used for determining the SRS expected transmission power;
the baseband power control module is used for determining the power value of the SRS baseband signal according to a preset baseband power gear; and
and the radio frequency power control module is used for determining a gain gear of radio frequency power control according to the SRS expected transmitting power and the power value of the SRS baseband signal.
It should be noted that, each module included in the above terminal may be implemented by the method disclosed in the foregoing embodiment, and a description thereof will not be repeated here.
Based on the same inventive concept, the present disclosure also provides an electronic device corresponding to the method of any embodiment, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, where the processor implements the sounding reference signal generating method of any embodiment when executing the program.
Fig. 7 is a schematic diagram of a hardware structure of an electronic device according to the embodiment, where the device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 implement communication connections therebetween within the device via a bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit ), microprocessor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, etc. for executing relevant programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory ), static storage device, dynamic storage device, or the like. Memory 1020 may store an operating system and other application programs, and when the embodiments of the present specification are implemented in software or firmware, the associated program code is stored in memory 1020 and executed by processor 1010.
The input/output interface 1030 is used to connect with an input/output module for inputting and outputting information. The input/output module may be configured as a component in a device (not shown in the figure) or may be external to the device to provide corresponding functionality. Wherein the input devices may include a keyboard, mouse, touch screen, microphone, various types of sensors, etc., and the output devices may include a display, speaker, vibrator, indicator lights, etc.
Communication interface 1040 is used to connect communication modules (not shown) to enable communication interactions of the present device with other devices. The communication module may implement communication through a wired manner (such as USB, network cable, etc.), or may implement communication through a wireless manner (such as mobile network, WIFI, bluetooth, etc.).
Bus 1050 includes a path for transferring information between components of the device (e.g., processor 1010, memory 1020, input/output interface 1030, and communication interface 1040).
It should be noted that although the above-described device only shows processor 1010, memory 1020, input/output interface 1030, communication interface 1040, and bus 1050, in an implementation, the device may include other components necessary to achieve proper operation. Furthermore, it will be understood by those skilled in the art that the above-described apparatus may include only the components necessary to implement the embodiments of the present description, and not all the components shown in the drawings.
The electronic device of the foregoing embodiment is configured to implement the corresponding SRS generating or transmitting method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which is not described herein.
Based on the same inventive concept, the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to perform the SRS generation or transmission method according to any of the above embodiments, corresponding to any of the above embodiments.
The non-transitory computer readable storage media described above can be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), etc.
The storage medium of the above embodiment stores computer instructions for causing the computer to perform the SRS generating or transmitting method according to any one of the above exemplary method sections, and has the advantages of the corresponding method embodiments, which are not described herein.
Those skilled in the art will appreciate that embodiments of the present disclosure may be implemented as a system, method, or computer program product. Accordingly, the present disclosure may be embodied in the following forms, namely: all hardware, all software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software, is generally referred to herein as a "circuit," module, "or" system. Furthermore, in some embodiments, the present disclosure may also be embodied in the form of a computer program product in one or more computer-readable media, which contain computer-readable program code.
Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive example) of the computer-readable storage medium could include, for example: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer, for example, through the internet using an internet service provider.
It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable medium produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
Furthermore, although the operations of the methods of the present disclosure are depicted in the drawings in a particular order, this is not required to or suggested that these operations must be performed in this particular order or that all of the illustrated operations must be performed in order to achieve desirable results. Rather, the steps depicted in the flowcharts may change the order of execution. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.
Use of the verb "comprise," "include" and its conjugations in this application does not exclude the presence of elements or steps other than those stated in the application. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
While the spirit and principles of the present disclosure have been described with reference to several particular embodiments, it is to be understood that this disclosure is not limited to the particular embodiments disclosed nor does it imply that features in these aspects are not to be combined to benefit from this division, which is done for convenience of description only. The disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims (12)

1. A sounding reference signal, SRS, generation method comprising:
receiving SRS configuration parameters from a base station;
generating an SRS signal sequence according to the SRS configuration parameters;
mapping the SRS signal sequence to an IFFT input sequence register according to the SRS configuration parameters to obtain an IFFT input sequence; the size of the IFFT input sequence register is the ratio of the number of the preset maximum IFFT conversion points of the system to the number of transmission combs in the SRS configuration parameters;
performing IFFT on the IFFT input sequence to obtain a first time domain SRS sequence;
copying and phase compensating the first time domain SRS sequence to obtain a second time domain SRS sequence; and
performing cyclic prefix adding operation on the second time domain SRS sequence to generate an SRS baseband signal;
wherein the mapping the SRS signal sequence to the IFFT input sequence register according to the SRS configuration parameters includes:
determining a sequence splitting parameter according to the RE position of the initial resource particle in the SRS signal sequence frequency domain;
splitting the generated SRS signal sequence into a first sequence and a second sequence according to the sequence splitting parameter; wherein the first sequence is denoted S 1 = { S (m), S (m+1), …, S (u) }, the second sequence is denoted S 2 = { S (0), S (1), …, S (m-1) }; wherein u is represented as the length of the SRS signal sequence; m is the sequence splitting parameter;
mapping the SRS signal sequence to an IFFT input sequence register; wherein the IFFT input sequence register has the size ofThe IFFTSize is the preset maximum conversion point number of the system; k (K) TC -a number of said transmission combs;
wherein, determining the sequence splitting parameter according to the RE position of the SRS signal sequence frequency domain start includes:
when (when)When in use, let->Otherwise, let m=0;
wherein F is start A starting RE position of the SRS signal sequence frequency domain; BWP represents the frequency domain bandwidth;
wherein the mapping the generated SRS signal sequence to the IFFT input sequence register comprises:
in response to determining that m=0, sequence S will be 1 By taking the starting position asSequentially without intervalsMapping to the head of the IFFT input sequence register, and inserting 0 at other positions of the IFFT input sequence register;
in response to determining that m+.0, sequence S 1 Mapping S to the head of the IFFT input sequence register with the starting position of 0 sequentially and without interval 2 Mapped to the tail of the IFFT input sequence register and inserted with 0's elsewhere in the IFFT input sequence register.
2. The method of claim 1, wherein replicating and phase compensating the first time domain SRS sequence comprises:
copying the first time domain SRS sequence; the number of times of copying the first time domain SRS sequence is equal to the transmission comb number;
the copied plurality of first time domain SRS sequences are connected in series in the time domain to obtain a first intermediate sequence;
and multiplying each element in the first intermediate sequence by a preset first phase shift factor corresponding to the element to obtain the second time domain SRS sequence.
3. The method of claim 2, wherein the first phase shift factor p 1 (g) The method comprises the following steps:
wherein shift is a preset phase compensation parameter; IFFTSize is the maximum number of conversion points of the system; the parameter g represents the g-th element in the first intermediate sequence.
4. The method of claim 1, wherein replicating and phase compensating the first time domain SRS sequence comprises:
multiplying each element in the first time domain SRS sequence by a preset second phase shift factor corresponding to the element to obtain a second intermediate sequence;
copying the second intermediate sequence, wherein the number of times of copying the second intermediate sequence is equal to the transmission comb number;
Multiplying each element in the second intermediate sequences by a preset third shifting factor corresponding to each second intermediate sequence to obtain a plurality of third intermediate sequences; and
and connecting the plurality of third intermediate sequences in series in the time domain to obtain the second time domain SRS sequence.
5. The method of claim 4, wherein the second phase shift factor p 2 (n) is:
wherein shift is a preset phase compensation parameter; the parameter n represents the nth element in the first time domain SRS sequence; IFFTSize is the maximum number of conversion points of the system; k (K) TC -a number of said transmission combs;
the third phase shift factor p 3 (k) The method comprises the following steps:
wherein the parameter k represents the kth second intermediate sequence.
6. The method of claim 3 or 4, wherein the phase compensation parameter is set according to a starting RE position of the SRS signal sequence frequency domain and the transmission comb number.
7. The method of claim 3 or 4, wherein the phase compensation parameter is set according to a starting RE position of the SRS signal sequence frequency domain, the transmission comb number, and a carrier phase.
8. The method of claim 1, further comprising:
determining an SRS expected transmission power;
Determining the power value of the SRS baseband signal according to a preset baseband power gear;
and determining a gain gear of radio frequency power control according to the SRS expected transmitting power and the power value of the SRS baseband signal.
9. A terminal, comprising:
a configuration parameter receiving module, configured to receive sounding reference signal SRS configuration parameters from a base station;
the sequence generation module is used for generating an SRS signal sequence according to the SRS configuration parameters;
the frequency domain mapping module is used for mapping the generated SRS signal sequence to an IFFT input sequence register according to the SRS configuration parameters to obtain an IFFT input sequence; the size of the IFFT input sequence register is the ratio of the number of the preset maximum system conversion points to the number of transmission combs in the SRS configuration parameters;
the transformation module is used for performing IFFT on the IFFT input sequence to obtain a first time domain SRS sequence;
the copying module is used for copying the first time domain SRS sequence and compensating the phase to obtain a second time domain SRS sequence; and
the baseband signal generation module is used for executing cyclic prefix adding operation on the second time domain SRS sequence to generate an SRS baseband signal;
wherein the mapping the SRS signal sequence to the IFFT input sequence register according to the SRS configuration parameters includes:
Determining a sequence splitting parameter according to the RE position of the initial resource particle in the SRS signal sequence frequency domain;
splitting the generated SRS signal sequence into a first sequence and a second sequence according to the sequence splitting parameter; wherein the first sequence is denoted S 1 = { S (m), S (m+1), …, S (u) }, the second sequence is denoted S 2 = { s (0), s (1), …, s (m-1) }; wherein u is represented as the length of the SRS signal sequence; m is the sequence split ginsengA number;
mapping the SRS signal sequence to an IFFT input sequence register; wherein the IFFT input sequence register has the size ofThe IFFTSize is the preset maximum conversion point number of the system; k (K) TC -a number of said transmission combs;
wherein, determining the sequence splitting parameter according to the RE position of the SRS signal sequence frequency domain start includes:
when (when)When in use, let->Otherwise, let m=0;
wherein F is start A starting RE position of the SRS signal sequence frequency domain; BWP represents the frequency domain bandwidth;
wherein the mapping the generated SRS signal sequence to the IFFT input sequence register comprises:
in response to determining that m=0, sequence S will be 1 By taking the starting position asSequentially mapping the non-interval parts to the head parts of the IFFT input sequence registers, and inserting 0 in other positions of the IFFT input sequence registers;
In response to determining that m+.0, sequence S 1 Mapping S to the head of the IFFT input sequence register with the starting position of 0 sequentially and without interval 2 Mapped to the tail of the IFFT input sequence register and inserted with 0's elsewhere in the IFFT input sequence register.
10. The terminal of claim 9, further comprising:
the expected transmission power determining module is used for determining the SRS expected transmission power;
the baseband power control module is used for determining the power value of the SRS baseband signal according to a preset baseband power gear; and
and the radio frequency power control module is used for determining a gain gear of radio frequency power control according to the SRS expected transmitting power and the power value of the SRS baseband signal.
11. A computer device, comprising:
one or more processors, memory; and
one or more programs;
wherein the one or more programs are stored in the memory and executed by the one or more processors, the programs comprising instructions for performing the sounding reference signal generation method according to any one of claims 1 to 5.
12. A non-transitory computer-readable storage medium containing a computer program, which when executed by one or more processors, causes the processors to perform the sounding reference signal generation method of any one of claims 1 to 5.
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