Communication method and apparatus

Abstract

Provided in the embodiments of the present application are a communication method and apparatus, by means of which a sensing reference signal can be adaptively adjusted with a scheduled bandwidth, thereby improving the sensing performance. The method comprises: a first node acquiring a sensing reference signal, wherein the sensing reference signal carries a sensing sequence, a first relationship is satisfied between the length of the sensing sequence and the number M of sub-carriers corresponding to a scheduled bandwidth of the sensing reference signal, M can be exactly divided by 12, and the sum of a bandwidth occupied by the sensing sequence and a guard band of the sensing sequence is greater than or equal to the scheduled bandwidth of the sensing reference signal; and the first node outputting the sensing reference signal.

Description

Communication method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on February 20, 2024, with application number 202410192182.0 and application name “Communication Method and Device,” the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of integrated sensing and communication (ISAC), and more specifically, to a communication method and apparatus. Background Art

[0003] For a complex signal s(t), its fuzzy function is defined as shown in the following formula 1:

[0004] Where τ represents the delay, f d represents the Doppler frequency, j represents the imaginary unit, j 2 = -1, * indicates complex conjugate. The ideal ambiguity function can achieve perfect resolution between any two different targets (with different distances and / or velocities), no matter how close their distances (from which time delays can be inferred) and velocities (from which Doppler frequencies can be inferred). However, in practical applications, the ambiguity function of the signal will have side lobes, that is, when τ ≠ 0 and / or f d There is a peak at ≠0. Different signal forms have different side lobes, but the signal design always tries to make the side lobes as low as possible.

[0005] In ISAC scenarios, the transmitted signal includes a perception reference signal (PRS) for estimating information such as the distance to objects in the environment. An ambiguity function with low sidelobes helps improve the perception performance of the PRS. Therefore, designing a ambiguity function with low sidelobes for the PRS is an urgent problem to be solved.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a communication method and apparatus, which can enable a perception reference signal to be adaptively adjusted with a scheduling bandwidth, thereby improving perception performance.

[0008] To achieve the above objectives, this application adopts the following technical solutions:

[0009] In a first aspect, a communication method is provided. The method can be executed by a first node, or by a component of the first node, such as a processor, chip, or chip system of the first node, or by a logic module or software capable of implementing all or part of the functions of the first node. Taking the method as an example of being executed by the first node, the method includes: the first node acquiring a perception reference signal, where the perception reference signal carries a perception sequence, where the length of the perception sequence and the number M of subcarriers corresponding to the scheduling bandwidth of the perception reference signal satisfy a first relationship, where M is divisible by 12; the sum of the bandwidth occupied by the perception sequence and the guard band of the perception sequence is greater than or equal to the scheduling bandwidth of the perception reference signal; and the first node outputting the perception reference signal.

[0010] In the communication method provided by the embodiment of the present application, the length of the perception sequence corresponding to the perception reference signal and the number M of subcarriers corresponding to the scheduling bandwidth of the perception reference signal satisfy a first relationship, and the sum of the bandwidth occupied by the perception sequence and the guard band is greater than or equal to the scheduling bandwidth of the perception reference signal. The existence of the guard band, on the one hand, can enable the perception reference signal to be adaptively adjusted with the scheduling bandwidth; on the other hand, the existence of the guard band can reduce the interference of the perception sequence from other signals (such as the first signal) other than the perception reference signal, thereby improving the perception performance of the perception reference signal. In particular, when the sum of the bandwidth occupied by the perception sequence and the guard band is greater than the scheduling bandwidth of the perception reference signal, the perception performance of the perception reference signal for high-speed moving targets can be guaranteed.

[0011] In a second aspect, a communication method is provided. The method can be executed by a second node, or by a component of the second node, such as a processor, chip, or chip system of the second node, or by a logic module or software capable of implementing all or part of the functions of the second node. Taking the method as an example, the method can be executed by the second node, and includes: the second node receiving an echo signal after a target acts on a sensing reference signal, the sensing reference signal carrying a sensing sequence, the length of the sensing sequence and the number M of subcarriers corresponding to the scheduling bandwidth of the sensing reference signal satisfying a first relationship, wherein M is divisible by 12; the sum of the bandwidth occupied by the sensing sequence and the guard band of the sensing sequence is greater than or equal to the scheduling bandwidth of the sensing reference signal; and the second node sensing the target based on the echo signal.

[0012] In the communication method provided by the embodiment of the present application, the length of the perception sequence corresponding to the perception reference signal and the number M of subcarriers corresponding to the scheduling bandwidth of the perception reference signal satisfy a first relationship, and the sum of the bandwidth occupied by the perception sequence and the guard band is greater than or equal to the scheduling bandwidth of the perception reference signal. The existence of the guard band, on the one hand, can enable the perception reference signal to be adaptively adjusted with the scheduling bandwidth; on the other hand, the existence of the guard band can reduce the interference of the perception sequence from other signals (such as the first signal) other than the perception reference signal, thereby improving the perception performance of the perception reference signal. In particular, when the sum of the bandwidth occupied by the perception sequence and the guard band is greater than the scheduling bandwidth of the perception reference signal, the perception performance of the perception reference signal for high-speed moving targets can be guaranteed.

[0013] In combination with the first aspect or the second aspect, in a possible implementation of the embodiment of the present application, the first relationship satisfies the following formula:

[0014] in, is the length of the sensing sequence, the first factor n0 is a positive integer, and the second factor δ∈{0,1,2}. This scheme can adaptively adjust the length of the sensing sequence with the scheduling bandwidth of the sensing reference signal, thereby improving the perception performance of the sensing reference signal.

[0015] In combination with the first or second aspect, in one possible implementation of the embodiment of the present application, the first factor n0 is a maximum positive integer that satisfies a first relationship. In this solution, since the range resolution of the perception reference signal is proportional to the effective bandwidth of the perception reference signal (equal to the length of the perception reference sequence multiplied by the subcarrier spacing, which may be less than the scheduling bandwidth of the perception reference signal), the longer the perception sequence length, the better the range resolution. Therefore, when the first factor n0 is a maximum positive integer that satisfies the first relationship, the perception performance (range resolution) of the perception reference signal is optimal.

[0016] In combination with the first or second aspect, in one possible implementation of the embodiment of the present application, when the second factor δ = 0, the sensing sequence is one of the Gray complementary pair sequences; when the second factor δ = 1, the sensing sequence is the longest linear shift register sequence (also known as an m-sequence) or the golden sequence (also known as the gold sequence); when the second factor δ = 2, the sensing sequence is generated based on the Zadoff-Chu (ZC) sequence. The sensing reference signal carrying this sensing sequence has better sensing performance.

[0017] In combination with the first aspect or the second aspect, in a possible implementation manner of the embodiment of the present application, when the sum of the bandwidth occupied by the sensing sequence and the guard band is equal to the scheduling bandwidth of the sensing reference signal, the number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula:

[0018] The number of subcarriers corresponding to the other guard band of the two guard bands of the sensing sequence satisfies the following formula:

[0019] in, Indicates rounding down. Indicates rounding up.

[0020] In combination with the first aspect or the second aspect, in a possible implementation of an embodiment of the present application, when the sum of the bandwidth occupied by the sensing sequence and the guard band is greater than the scheduling bandwidth of the sensing reference signal, the sum of the bandwidth occupied by the sensing sequence and the guard band corresponds to a non-integer or integer number of physical resource blocks (RBs). When the sum of the bandwidth occupied by the sensing sequence and the guard band corresponds to a non-integer number of RBs, the number of subcarriers corresponding to the extended portion of the guard band (which is located outside the scheduling bandwidth of the sensing reference signal) is designed to be more flexible and can save frequency domain resources. When the sum of the bandwidth occupied by the sensing sequence and the guard band corresponds to an integer number of RBs, the number of subcarriers corresponding to the extended portion of the guard band is a multiple of 6, which can simplify signaling design.

[0021] In combination with the first aspect or the second aspect, in a possible implementation manner of the embodiment of the present application, the number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula:

[0022] The number of subcarriers corresponding to the other guard band of the two guard bands of the sensing sequence satisfies the following formula:

[0023] Where x1 is a positive integer.

[0024] In combination with the first aspect or the second aspect, in a possible implementation manner of the embodiment of the present application, the number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula:

[0025] The number of subcarriers corresponding to the other guard band of the two guard bands of the sensing sequence satisfies the following formula:

[0026] Where x2 is a positive integer.

[0027] In combination with the first aspect or the second aspect, in an embodiment of the present application, x1 or x2 is predefined, and this scheme can save the overhead of indicating resources; or, x1 or x2 is configured by the network device through at least one of the radio resource control RRC, the media access control layer-control unit MAC-CE, and the downlink control information DCI, and this scheme is more flexible.

[0028] In combination with the first or second aspect, in an embodiment of the present application, some of the time-frequency resources scheduled by the first signal are not used for signal transmission, and some of the time-frequency resources overlap with the time-frequency resources occupied by the sensing sequence and the time-frequency resources occupied by the guard band of the sensing sequence. This solution can ensure the perception performance of the sensing reference signal for (particularly) high-speed moving targets.

[0029] In a third aspect, a communication device is provided for implementing the various methods described above. The communication device may be the first node described in the first aspect, or a device included in the first node, such as a chip; or the communication device may be the second node described in the second aspect, or a device included in the second node, such as a chip.

[0030] The communication device includes modules, units, or means corresponding to the above-mentioned method, which can be implemented by hardware, software, or hardware executing corresponding software implementation. The hardware or software includes one or more modules or units corresponding to the above-mentioned functions.

[0031] In some possible designs, the communication device may include a processing module and a communication module. The communication module may include an output module (or a sending module) and an input module (or a receiving module), respectively configured to implement the output (or sending) and input (or receiving) functions of any of the above aspects and any possible designs thereof. The processing module may be configured to implement the processing functions of any of the above aspects and any possible designs thereof.

[0032] Optionally, the communication device further includes a storage module for storing program instructions and data.

[0033] In a fourth aspect, a communication device is provided, comprising: at least one processor configured to execute a computer program or instruction, or to cause the communication device to execute the method described in any of the above aspects through logic circuitry. The communication device may be the first node described in the first aspect, or a device included in the first node, such as a chip; or the communication device may be the second node described in the second aspect, or a device included in the second node, such as a chip.

[0034] In some possible designs, the communication device further includes a memory for storing computer instructions and / or configuration files of logic circuits. Optionally, the memory is integrated with the processor, or the memory is independent of the processor.

[0035] In one possible design, the communication device further includes a communication interface for inputting and / or outputting signals.

[0036] In some possible designs, the communication interface is an interface circuit for reading and writing computer instructions. For example, the interface circuit is used to receive computer execution instructions (computer execution instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor.

[0037] In some possible designs, the communication interface is used to communicate with modules outside the communication device.

[0038] In some possible designs, the communication device may be a chip system. When the communication device is a chip system, the chip system may include a chip or may include a chip and other discrete devices.

[0039] In a fifth aspect, a communication device is provided, comprising: a logic circuit and an interface circuit; the interface circuit is configured to input and / or output information; and the logic circuit is configured to execute the method described in any of the above aspects, processing the input information and / or generating output information. The communication device may be the first node described in the first aspect, or a device included in the first node, such as a chip; or the communication device may be the second node described in the second aspect, or a device included in the second node, such as a chip.

[0040] It can be understood that when the communication device provided in any one of the third to fifth aspects is a chip, the above-mentioned sending action / function can be understood as output information, and the above-mentioned receiving action / function can be understood as input information.

[0041] In a sixth aspect, a computer-readable storage medium is provided, in which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the method described in any one of the above aspects is executed.

[0042] In a seventh aspect, a computer program product is provided, which, when executed by a processor, enables the method described in any one of the above aspects to be executed.

[0043] In an eighth aspect, a communication device is provided, which includes a module / unit for executing the method described in the first aspect or the second aspect.

[0044] In a ninth aspect, a communication system is provided, comprising the first node described in the first aspect and the second node described in the second aspect. The first node and the second node may be implemented as the communication device provided in any one of the third to fifth aspects.

[0045] Among them, the technical effects brought about by any design method in the third to ninth aspects can refer to the technical effects brought about by different design methods in the above-mentioned first or second aspects, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a typical flow chart of OFDM;

[0047] FIG2 is a schematic diagram of an ambiguity function of an LTE PSS in three dimensions;

[0048] Figure 3 is a two-dimensional Doppler slice image of the LTE PSS;

[0049] FIG4 is a schematic diagram of the ambiguity function of the NR PSS in three-dimensional form;

[0050] Figure 5 is a two-dimensional Doppler slice image of the NR PSS;

[0051] FIG6 is a schematic diagram of an ambiguity function of an OFDM signal generated based on Formula 6;

[0052] FIG7 is a schematic diagram of an ambiguity function of an OFDM signal generated based on an interleaved ZC sequence;

[0053] Figure 8 is based on ZC u (n) Schematic diagram of the ambiguity function of the OFDM signal generated by the root index pair [u1, u2] = [29 34];

[0054] FIG9 is a schematic diagram of an ambiguity function of an OFDM signal generated based on a sequence a having a length of 256;

[0055] FIG10 is a schematic diagram of a communication system provided in an embodiment of the present application;

[0056] FIG11 is a schematic structural diagram of a communication device 1100 provided in an embodiment of the present application;

[0057] FIG12 is a schematic diagram of an example of a communication method provided in an embodiment of the present application;

[0058] FIG13 is a schematic diagram showing that the sum of the bandwidth occupied by a sensing sequence and the bandwidth of a guard band corresponding to the sensing sequence in the frequency domain is equal to the scheduling bandwidth of a sensing reference signal, provided by an embodiment of the present application;

[0059] FIG14 is a schematic diagram showing that the sum of the bandwidth occupied by a sensing sequence and the bandwidth of a guard band corresponding to the sensing sequence in the frequency domain is greater than the scheduling bandwidth of a sensing reference signal, provided by an embodiment of the present application;

[0060] FIG15 is a schematic diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] In the description of this application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0062] In the description of this application, unless otherwise specified, "plurality" means two or more than two. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b and / or c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or plural.

[0063] In addition, to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will understand that the words "first" and "second" do not limit the quantity or execution order, and the words "first" and "second" do not necessarily mean different.

[0064] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner to facilitate understanding.

[0065] It will be understood that the “embodiment” mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the various embodiments throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It will be understood that in the various embodiments of the present application, the size of the sequence number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0066] It can be understood that in this application, "when" and "if" both mean that corresponding processing will be taken under certain objective circumstances, and do not limit the time, nor do they require any judgment action when implementing, nor do they mean that there are other limitations.

[0067] It is understood that some optional features in the embodiments of the present application may, in certain scenarios, be implemented independently of other features, such as the solution on which they are currently based, to solve corresponding technical problems and achieve corresponding effects. They may also be combined with other features in certain scenarios as needed. Accordingly, the devices provided in the embodiments of the present application may also implement these features or functions accordingly, which will not be described in detail here.

[0068] In this application, unless otherwise specified, the same or similar parts between the various embodiments can refer to each other. In the various embodiments of this application, unless otherwise specified and there is no logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships. The following description of the embodiments of this application does not constitute a limitation on the scope of protection of this application.

[0069] To facilitate the reader's understanding, the following describes the relevant technologies of the embodiments of this application:

[0070] 1. Orthogonal frequency division multiplexing (OFDM).

[0071] Figure 1 is a typical flow chart of OFDM. As shown in Figure 1, the input signal of the signal transmitter is the frequency domain signal {S(p)}. The serial-to-parallel conversion (S / P) module converts X consecutive data S(kX), S(kX+1), ..., S(kX+X-1) into an X-dimensional data block S k =[S(kX),S(kX+1),…,S(kX+X-1)] T . Further, through subcarrier mapping, S k The X data carried modulates X subcarriers among the N subcarriers, and the remaining (NX) subcarriers can be understood as being modulated by 0. Then, the N-dimensional data vector X k A set of N complex time domain sampling points x is obtained by performing an N-point inverse discrete Fourier transform (IDFT) k =[x k (0),x k (1),…,x k (N-1)] T .

[0072] Wherein, the subscript k represents the sequence number of the OFDM symbol, the superscript T represents transposition, and N, X, and k are positive integers.

[0073] The next important step in generating OFDM signals is to insert a guard field at the beginning of each OFDM symbol. Inserting a guard field at the beginning of each OFDM symbol can eliminate inter-symbol interference (ISI) caused by multipath propagation (the phenomenon in which a radio signal reaches the receiver through two or more paths). Specifically, the guard field is obtained by adding a cyclic prefix (CP) to the beginning of each OFDM symbol. The specific implementation is to copy x k The last G sampling points of x k At the beginning of the time domain OFDM signal Therefore, one OFDM symbol contains valid data x k and CP (ie, redundant data).

[0074] Wherein, G is a positive integer.

[0075] At the receiving end, the OFDM signal is demodulated by the inverse process. Assuming that time and frequency are synchronized and the CP length is sufficient, after the CP removal operation (i.e., removing the first G samples in the received signal), a data block containing N samples with no ISI can be obtained. This data block containing N samples with no ISI is also equal to the OFDM symbol x k The cyclic convolution with the channel impulse response can be converted from the time domain cyclic convolution to the frequency domain point multiplication through discrete Fourier transform (DFT), and then the channel equalization can be completed with low complexity using frequency domain single-tap equalization.

[0076] It should be understood that when the number of transform points N satisfies certain constraints, such as when N is a power of 2, 3, or 5, the IDFT can also be implemented using the efficient inverse fast Fourier transform (IFFT). Correspondingly, the DFT can also be implemented using the efficient fast Fourier transform (FFT). In the embodiments of the present application, the IDFT and IFFT are interchangeable, and the DFT and FFT are interchangeable, and this embodiment of the present application does not limit this.

[0077] 2. Primary synchronization signal (PSS).

[0078] To access a cell, a terminal device must first perform a cell search, which involves a series of synchronization phases. These phases allow the terminal device to determine the time and frequency parameters necessary for demodulating downlink signals and transmitting precisely timed uplink signals. Furthermore, during the synchronization phase, the terminal device also acquires key system parameters.

[0079] The synchronization process uses two specially designed physical signals, broadcast in each cell, to achieve synchronization. These signals are the PSS and the secondary synchronization signal (SSS). Detection of the PSS and SSS not only synchronizes time and frequency but also provides the physical-layer cell identity (PCI) of the terminal device.

[0080] Use s n (l),l=0,1,…,L PSS -1 means the nth one, length is L PSS There are three types of PSS signals in long term evolution (LTE) or new radio (NR), namely n∈{0,1,2}, each of which carries a cell identifier 2, denoted as ), and r(l),l=0,1,…,L PSS -1 is the received PSS signal, based on and s n (l) By performing the relevant calculations shown in Formula 2, we can obtain the time delay τ and the normalized Doppler Δ f (equal to the Doppler frequency f d divided by the subcarrier spacing) and an estimate of the cell identity 2. Wherein, Formula 2 is as follows:

[0081] Where Γ represents the preset threshold, delay τ, normalized Doppler Δ f The estimation performance of α and cell ID 2 is mainly determined by the ambiguity function of PSS.

[0082] In LTE, PSS uses OFDM modulation. The frequency domain signal corresponding to PSS is a Zadoff-Chu (ZC) sequence with a length of 62, as shown in the following formula 3:

[0083] Among them, the root index u is relatively prime to 63. When , the root index u=25; when When , the root index u=29; when , the root index u=34.

[0084] The ambiguity function of LTE PSS has high side lobes, as shown in Figures 2 and 3. Figure 2 is a three-dimensional representation of the ambiguity function of LTE PSS, where the horizontal and vertical axes represent the time delay and the normalized Doppler frequency, respectively, and the z-axis represents the absolute value of the ambiguity function, i.e., |χ(τ,f d )|, where the subcarrier spacing is 15kHz. Figure 3 is a two-dimensional Doppler slice diagram of LTE PSS, with the normalized Doppler Δ f Fixed to 0 and 0.5 (i.e. Doppler f d =1 / 2 subcarrier spacing). Combined with Figure 3, we can see that when Δ f When τ = 0.5, the maximum value of the ambiguity function is not obtained at τ = 0, but at τ = 2, which leads to erroneous delay estimation.

[0085] In NR, the PSS is also an OFDM signal. The corresponding frequency domain signal is a binary phase shift keying (BPSK) symbol sequence, which is mapped by BPSK modulation from a maximum-length linear shift register sequence (referred to as an m-sequence) x(m) with a length of 127. The m-sequence is shown in Formula 4:

[0086] Here, mod represents the remainder, for example, 12 mod 5 = 2.

[0087] Here, x(m) is generated by a 7-stage linear shift register, and the linear feedback logic of the linear shift register is as follows: x(i+7)=(x(i+4)+x(i))mod 2

[0088] In practice, the feedback logic is generally generated by the polynomial g(x) = x 7 +x 4 +1 indicates that the initial value of the linear shift register is as follows: [x(6) x(5) x(4) x(3) x(2) x(1)] = [1 1 1 0 1 1 0]

[0089] The ambiguity function of NR PSS is shown in Figures 4 and 5. Figure 4 is a three-dimensional representation of the ambiguity function of NR PSS, where the horizontal and vertical axes represent the time delay and the normalized Doppler frequency, respectively, and the z-axis represents the absolute value of the ambiguity function, i.e., |χ(τ,f d )|, where the subcarrier spacing is 15kHz. Figure 5 is a two-dimensional Doppler slice of the NR PSS, with the normalized Doppler Δ fFixed to 0 and 0.5. Comparing Figures 2 and 4, we can see that the NR PSS ambiguity function has fewer and lower sidelobes than the LTE ambiguity function. In addition, as can be seen from Figure 5, when Δ f When τ = 0.5, the maximum value of the ambiguity function is still obtained at τ = 0, ensuring the correct delay estimation.

[0090] 3. Other sequence designs that produce low ambiguity function sidelobes.

[0091] 3.1.ZC sequence.

[0092] The common ZC sequence generation method is shown in Formula 5:

[0093] Among them, the root index u and N ZC Mutually prime, N ZC An odd number.

[0094] If we remove the middle element of the ZC sequence generated based on Formula 5 (i.e. ), then we can get the length (N ZC -1) is designed as shown in Formula 6.

[0095] For example, comparing Formula 6 with Formula 3, we can find that the LTE PSS corresponds to N in Formula 6. ZC The special case of 63. Increasing the ZC sequence length is beneficial to improving the performance of the ambiguity function. On the one hand, without changing the subcarrier spacing, the longer the ZC sequence, the larger the bandwidth occupied by the ZC sequence, the narrower the main lobe of the ambiguity function, and the better the range resolution. On the other hand, as the ZC sequence length increases, the optional values ​​of the root index u become more numerous, and it is possible to select a more appropriate u to generate an ambiguity function with lower side lobes. For example, consider a root index of 116 and N ZC = 254, the subcarrier spacing is 15 kHz, and Figure 6 shows the ambiguity function of the OFDM signal generated based on Formula 6. As shown in Figure 6, the ambiguity function of the OFDM signal in this case is improved compared to the ambiguity function of the LTE PSS in terms of both the number of sidelobes and the sidelobe peak value.

[0096] 3.2.m sequence.

[0097] It should be understood that the NR PSS in the above-mentioned related technology 2 adopts only a specific m-sequence, that is, the length is 127, and the generating polynomial is g(x)=x 7 +x 4 +1, the initial value is an m-sequence of [0110111].

[0098] The length of the m sequence is limited to 2 r -1. Where r is a positive integer. The length is 2 rThe m-sequence of -1 can be generated by an r-stage linear shift register, and the generating polynomial is a primitive polynomial. For example, when r = 7, there are 18 selectable primitive polynomials; when r = 8, there are 16 selectable primitive polynomials.

[0099] The golden sequence (also called gold sequence) is constructed by adding m-sequence pairs modulo 2. An m-sequence pair refers to two m-sequences with the same length (i.e., the same r) but different primitive polynomials. These two m-sequences may also have the same initial value. Each m-sequence pair can generate 2 r +1 gold sequence.

[0100] 3.3. Interleaving ZC sequences.

[0101] The interleaved ZC sequence is generated as shown in Formula 7:

[0102] in, Indicates rounding down.

[0103] Combined with formula 7, we can find and They are conjugated to each other.

[0104] For example, when N ZC =126, the root index is 29, and FIG7 is an ambiguity function of an OFDM signal generated based on an interleaved ZC sequence. As shown in FIG7 , the ambiguity function of the OFDM signal at this time has low side lobes.

[0105] 3.4. Frequency-divided ZC sequence.

[0106] A frequency-division ZC sequence can be understood as a ZC sequence formed by the concatenation of two or more ZC sequences (the root indexes of the two or more ZC sequences can be referred to as a root index pair). For example, a ZC sequence of length 126 designed according to Formula 8 can be understood as the concatenation of ZC sequence 1 (root index u1 (u1 and 63 are mutually prime), length 63) and ZC sequence 2 (root index u2 (u2 and 63 are mutually prime), length 63). Formula 8 is as follows:

[0107] Figure 8 is based on ZC u The ambiguity function of the OFDM signal generated by (n) (root index pair [u1, u2] = [29 34]). The subcarrier spacing is 15 kHz. As shown in Figure 8, the number of sidelobes and the sidelobe peak amplitude of the ambiguity function of this OFDM signal are both low.

[0108] 3.5. Binary Golay Complementary Pairs (GCP)

[0109] make and are two sequences of length M0, and a k ,b k ∈{-1,1}, If a and b satisfy Formula 9, then a and b are called a Golay complementary sequence pair. Formula 9 is as follows:

[0110] Among them, the sequence length M0 in GCP is limited and satisfies Formula 10, which is as follows:

[0111] Among them, α1, α2 and α3 are all non-negative integers.

[0112] FIG9 shows an ambiguity function of an OFDM signal generated based on a sequence a of length 256. The subcarrier spacing is 15 kHz. As shown in FIG9 , the ambiguity function of the OFDM signal has low side lobes.

[0113] Related Art 2 introduces the sequence design for LTE PSS and NR PSS, while Related Art 3 introduces the design of other sequences with low ambiguity functions. As can be seen, these sequence lengths take on special values, such as 127, 255, or 256.

[0114] In ISAC scenarios, there are sensing reference signals (carrying sensing sequences). The number of subcarriers corresponding to their scheduling bandwidth (equal to 12 times the number of physical resource blocks (RBs)) is generally not equal to the aforementioned sequence length. Therefore, if the sensing sequence design refers to the sequence designs described in Related Art 2 and Related Art 3 above, the mismatch between the sequence length and the sensing reference signal scheduling bandwidth must be addressed.

[0115] Figure 10 is a schematic diagram of a communication system provided in an embodiment of the present application. As shown in Figure 10, the communication system includes at least one first node and at least one second node, wherein the first node can be a network device, or the first node can be a terminal device, and the second node can be a network device, or the second node can be a terminal device, which is not limited in the embodiment of the present application.

[0116] Optionally, embodiments of the present application can be applied to various communication systems, such as fifth-generation (5G) systems or NR, satellite communication systems, LTE systems, etc. The present application can also be applied to future communication systems, such as sixth-generation mobile communication systems. Embodiments of the present application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication systems or other communication systems.

[0117] Optionally, the terminal device involved in the embodiment of the present application can be a user equipment (UE), access terminal, terminal unit, user station, terminal station, mobile station, mobile station, remote station, remote terminal, user terminal terminal equipment, TE), mobile device, wireless communication device, terminal agent, tablet computer (pad), handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, vehicle-mounted device, vehicle-mounted transceiver unit, wearable device, or terminal device in a 5G network or a public land mobile network (PLMN) evolved after 5G. The access terminal can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a drone, a robot, a smart point of sale (POS) machine, a customer-premises equipment (CPE) or a wearable device, virtual reality (VR) The terminal may be a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical care, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, or a wireless terminal in smart home. Alternatively, the terminal may be a terminal with communication capabilities in the Internet of Things (IoT), such as a terminal in V2X (e.g., a vehicle-to-everything (V2X) device), a terminal in D2D communication, or a terminal in M2M communication. The terminal may be mobile or fixed.

[0118] Optionally, the network device involved in the embodiments of the present application may be a device for communicating with a terminal device, for example, it may include an evolved base station (NodeB or eNB or e-NodeB, evolutionary Node B) in an LTE system or an enhanced LTE (LTE-advanced, LTE-A) system, such as a traditional macro base station eNB and a micro base station eNB in ​​a heterogeneous network scenario. Alternatively, it may include a next generation node B (gNB) in a new radio (NR) system. Alternatively, it may include a transmission reception point (TRP), a home base station (e.g., a home evolved NodeB, or a home Node B, HNB), a base band unit (BBU), a base band pool (BBU pool), or a wireless fidelity (WiFi) access point (AP), etc. Alternatively, it may include a base station in a non-terrestrial network (NTN), which can be deployed on an aircraft or satellite. In the NTN, the network device or access device can function as a Layer 1 (L1) relay, a base station, or an integrated access and backhaul (IAB) node. Alternatively, the network device or access device can be a device that implements base station functions in the IoT, such as a device that implements base station functions in drone communications, V2X, D2D, or M2M.

[0119] In some possible scenarios, the network device in the embodiments of the present application may also be a module or unit that can implement some functions of the base station. For example, the network device may be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU may be set separately or included in the same network element, such as a baseband unit (BBU). The RU may be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0120] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, the network device may be a network device or a module of a network device in an open radio access network (open RAN, ORAN) system. In the ORAN system, CU may also be referred to as open (open, O)-CU, DU may also be referred to as O-DU, CU-CP may also be referred to as O-CU-CP, CU-UP may also be referred to as O-CU-UP, and RU may also be referred to as O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0121] Optionally, the base station in the embodiment of the present application may include various forms of base stations, such as: macro base stations, micro base stations (also called small stations), relay stations, access points, home base stations, TRPs, transmitting points (TPs), mobile switching centers, etc., and the embodiments of the present application do not make specific limitations on this.

[0122] It should be noted that the communication system described in the embodiment of the present application is intended to more clearly illustrate the technical solution of the embodiment of the present application, and does not constitute a limitation on the technical solution provided in the embodiment of the present application. Ordinary technicians in this field can know that with the evolution of network architecture and the emergence of new business scenarios, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

[0123] Optionally, the relevant functions of the terminal device and network device involved in this application can be implemented by one device, or by multiple devices together, or by one or more functional modules within a device, or by one or more chips, or by a system on chip (SOC) or a chip system. The chip system can be composed of chips, or can include chips and other discrete devices. The embodiments of this application do not specifically limit this.

[0124] It is understandable that the above functions can be network elements in hardware devices, software functions running on dedicated hardware, or a combination of hardware and software, or virtualized functions instantiated on a platform (e.g., a cloud platform).

[0125] For example, the relevant functions of the terminal equipment and network equipment involved in this application can be implemented by the communication device 1100 in Figure 11. Figure 11 is a structural diagram of the communication device 1100 provided in an embodiment of the present application. The communication device 1100 includes one or more processors 1111. The processor 1111 can be a general-purpose processor or a dedicated processor. For example, it can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device (such as a network device, a terminal device or a chip), execute software programs, and process software program data.

[0126] Optionally, in one design, the processor 1111 may include a program 1113 (sometimes also referred to as code or instructions), and the program 1113 may be run on the processor 1111 so that the communication device 1100 performs the method described in the following embodiments.

[0127] Optionally, the communication device 1100 may include one or more memories 1112 on which a program 1114 (sometimes also referred to as code or instructions) is stored. The program 1114 can be run on the processor 1111, so that the communication device 1100 performs the method described in the following method embodiment.

[0128] Optionally, the processor 1111 and / or the memory 1112 may include artificial intelligence (AI) modules 1117 and 1118, which are used to implement AI-related functions. The AI ​​module may be implemented through software, hardware, or a combination of software and hardware. For example, the AI ​​module may include a RAN intelligent controller (RIC) module. For example, the AI ​​module may be a near real-time RIC or a non-real-time RIC.

[0129] Optionally, data may be stored in the processor 1111 and / or the memory 1112. The processor and the memory may be provided separately or integrated together.

[0130] Optionally, the communication device 1100 may further include a transceiver 1115 and / or an antenna 1116. The processor 1111 may also be referred to as a processing unit, and controls the communication device (e.g., a network device or a terminal device). The transceiver 1115 may also be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, and is configured to implement the transceiver function of the communication device through the antenna 1116.

[0131] Optionally, in the embodiment of the present application, the processor 1111 is a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 1111 may also be other devices with processing functions, such as circuits, devices, or software modules, without limitation.

[0132] Optionally, in an embodiment of the present application, the memory 1112 may be a read-only memory (ROM) or other types of static storage devices that can store static information and / or instructions, or a random access memory (RAM) or other types of dynamic storage devices that can store information and / or instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0133] Although not shown, as an optional implementation, the communication device 1100 further includes an output device and an input device. For example, the input device is a keyboard, a mouse, a microphone, or a joystick, and the output device is a display screen, a speaker, or the like.

[0134] It should be noted that the communication device 1100 may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device having a structure similar to that shown in FIG11 . Furthermore, the structure shown in FIG11 does not limit the communication device. In addition to the components shown in FIG11 , the communication device may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0135] In the embodiment of the present application, the chip system can be composed of chips, or can include chips and other discrete devices.

[0136] The communication method provided in the embodiment of the present application will be described below in combination with the description of Figures 1 to 11 above.

[0137] It should be noted that in the following embodiments of the present application, the message names, parameter names, or information names between network elements are only examples. In other embodiments, they may also be other names, and the method provided in the present application does not make specific limitations on this.

[0138] It is understood that in the embodiments of the present application, each network element may perform some or all of the steps in the embodiments of the present application. These steps or operations are merely examples, and the embodiments of the present application may also perform other operations or variations of various operations. In addition, the steps may be performed in a different order than those presented in the embodiments of the present application, and it is possible that not all operations in the embodiments of the present application need to be performed.

[0139] Figure 12 is a schematic diagram of an example of a communication method provided in an embodiment of the present application. The method is illustrated by taking the interaction between the first node and the second node as an example. Of course, the subject that executes the action of the first node in the method can also be a device / module of the first node, such as a chip, processor, processing unit, etc. in the first node; the subject that executes the action of the second node in the method can also be a device / module in the second node, such as a chip, processor, processing unit, etc. in the second node, and the embodiment of the present application does not specifically limit this. For example, as shown in Figure 12, method 1200 includes:

[0140] S1210: The first node obtains a perception reference signal.

[0141] In this embodiment of the present application, the sensing reference signal carries a sensing sequence, and the length of the sensing sequence and the number of subcarriers M corresponding to the scheduling bandwidth of the sensing reference signal satisfy a first relationship, where M is divisible by 12, that is, the number of subcarriers M is equal to the number of RBs multiplied by 12.

[0142] In one possible implementation, the first relationship satisfies the following formula:

[0143] in, is the length of the sensing sequence, the first factor n0 is a positive integer, and the second factor δ∈{0,1,2}. This scheme allows the sensing sequence length to be adaptively adjusted with the sensing reference signal scheduling bandwidth (for example, even if M changes, the sensing sequence length still satisfies the first relationship), thereby improving the perceptual performance of the sensing reference signal.

[0144] Exemplarily, the first factor n0 is the largest positive integer that satisfies the first relation. Or, in other words, the first factor n0 makes is the maximum positive integer less than M. Since the range resolution of the sensing reference signal is proportional to the effective bandwidth of the sensing reference signal (equal to the length of the sensing reference sequence multiplied by the subcarrier spacing, which may be less than the scheduling bandwidth of the sensing reference signal), the longer the sensing sequence length, the better the range resolution. Therefore, when the first factor n0 is the maximum positive integer that satisfies the first relationship, the sensing performance (range resolution) of the sensing reference signal is optimal.

[0145] For example, when the second factor δ=0, the perception sequence is one of the GCP sequences. For the GCP sequence, please refer to the description in the related art 3.5, which will not be repeated here. When the second factor δ = 1, the perception sequence is an m-sequence or a golden sequence. For details about the m-sequence and golden sequence, refer to the description in Related Art 3.2 and are not repeated here. When the second factor δ = 2, the perception sequence is generated based on a ZC sequence. For example, the perception sequence can be the ZC sequence generated by Formula 6 in Related Art 3, or it can be an interleaved ZC sequence or a frequency-divided ZC sequence. For details about the interleaved ZC sequence and frequency-divided ZC sequence, refer to Related Art 3.3 and 3.4 and are not repeated here. The perception reference signal carrying this perception sequence has good perception performance.

[0146] In the embodiment of the present application, the scheduling bandwidth of the perception sequence may also be referred to as the transmission bandwidth of the perception sequence, etc., which is not limited in the embodiment of the present application.

[0147] In an embodiment of the present application, the sum of the bandwidth occupied by the perception sequence and the guard band is greater than or equal to the scheduling bandwidth of the perception reference sequence. Among them, the guard band places empty carriers, that is, these carriers are not used to transmit data. In this scheme, the bandwidth not occupied by the perception sequence is configured with a guard band. On the one hand, this allows the length of the perception sequence to be adaptively adjusted with the scheduling bandwidth; on the other hand, the guard band can reduce the interference of the perception sequence from the following first signal (such as inter-carrier interference (ICI)), thereby improving the perception performance of the perception reference signal. The first signal and the perception reference signal are frequency-division multiplexed, and the occupied time resources overlap.

[0148] In one possible implementation, the guard bands are located on both sides of the perception sequence. More specifically, the guard bands are symmetrically distributed on both sides of the perception sequence, or the guard bands are approximately symmetrically distributed on both sides of the perception sequence.

[0149] As a possible implementation manner, the guard band may be located on one side of the perception sequence, which is not limited in the embodiment of the present application.

[0150] Figure 13 is a schematic diagram illustrating that the sum of the bandwidth occupied by the sensing sequence and the guard band equals the scheduling bandwidth of the sensing reference signal. As shown in Figure 13, the sensing reference signal is part of the ISAC signal. The ISAC signal contains three symbols, with the sensing reference signal being the first symbol. The second and third symbols carry communication data signals (labeled "other signals" in the figure) and / or other reference signals (labeled "other signals" in the figure). It should be understood that the ISAC signal may also contain more than three symbols or two symbols. It should be understood that the sensing reference signal may not be the first symbol of the ISAC signal, such as the second symbol. As shown in Figure 13, the frequency domain resources scheduled by the first signal do not overlap with the frequency domain resources scheduled by the ISAC signal, but overlap in time. The overlapping portion includes the time resources scheduled by the sensing reference signal. The overlap involved in the embodiments of the present application can be complete or partial. For example, as shown in Figure 13, the first signal, whose frequency is higher than the frequency of the ISAC signal, completely overlaps with the ISAC signal in time. For another example, as shown in Figure 13, the first signal, whose frequency is lower than the frequency of the ISAC signal, completely and partially overlaps with the ISAC signal in time.

[0151] In this embodiment of the present application, when the sum of the bandwidth occupied by the sensing sequence and the guard band is equal to the scheduling bandwidth of the sensing reference signal, illustratively, the number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula:

[0152] The number of subcarriers corresponding to the other guard band of the two guard bands of the sensing sequence satisfies the following formula:

[0153] Among them, the Indicates rounding down, the Round up.

[0154] In this embodiment of the present application, one of the guard bands on either side of a sensing sequence may also be referred to as the left guard band of the sensing sequence, and the other of the guard bands on either side of the sensing sequence may also be referred to as the right guard band of the sensing sequence. The frequency of the left guard band is lower than the lowest frequency of the frequency resources scheduled by the sensing reference signal, while the frequency of the right guard band is higher than the highest frequency of the frequency resources scheduled by the sensing reference signal. This embodiment of the present application does not limit the names of the guard bands on either side of the sensing sequence.

[0155] That is, when the sum of the bandwidth occupied by the sensing sequence and the guard band is equal to the scheduling bandwidth of the sensing reference signal, for the above example, the number of subcarriers corresponding to the left guard band of the sensing sequence satisfies the following formula:

[0156] The number of subcarriers corresponding to the right guard band of the sensing sequence satisfies the following formula:

[0157] Alternatively, the number of subcarriers corresponding to the left guard band of the sensing sequence satisfies the following formula:

[0158] The number of subcarriers corresponding to the right guard band of the sensing sequence satisfies the following formula:

[0159] The number of subcarriers corresponding to the guard band in the embodiment of the present application can also be referred to as the guard band length, which is not limited in the embodiment of the present application. For example, the scheduling bandwidth of the perception reference signal corresponds to 50RB, that is, M=50*12=600, n0=9. If δ=0, the length of the left guard band is 44 and the length of the right guard band is 44; if δ=1, the length of the left guard band is 44 and the length of the right guard band is 45, or the length of the left guard band is 45 and the length of the right guard band is 44; if δ=2, the length of the left guard band is 45 and the length of the right guard band is 45.

[0160] For another example, the scheduling bandwidth of the perception reference signal corresponds to 25 RBs, that is, M = 25 * 12 = 300, and n0 = 8. If δ = 0, the length of the left guard band is 22, and the length of the right guard band is 22; if δ = 1, the length of the left guard band is 22, and the length of the right guard band is 23, or the length of the left guard band is 23, and the length of the right guard band is 22; if δ = 2, the length of the left guard band is 23, and the length of the right guard band is 23.

[0161] It should be understood that when the guard band length is short, the perceptual performance requirements of the perceptual reference signal may not be met in certain scenarios. For example, if the number of subcarriers corresponding to the guard bands on both sides is 5 subcarriers, and ICI significantly affects 10 subcarriers (for example, in high-speed scenarios, Doppler shift causes severe ICI), the guard band cannot ensure that the perceptual sequence is subject to negligible ICI, resulting in degraded perceptual performance of the perceptual reference signal. Therefore, to ensure perceptual performance, the guard band can be extended, with a portion of the guard band located outside the scheduling bandwidth. Figure 14 is a schematic diagram illustrating a situation where the sum of the bandwidth occupied by the perceptual sequence and the guard band is greater than the scheduling bandwidth of the perceptual reference signal. As shown in Figure 14, the perceptual reference signal is part of the ISAC signal. The ISAC signal contains three symbols, with the perceptual reference signal being the first symbol. The second and third symbols carry communication data signals (labeled "other signals" in the figure) and / or other reference signals (labeled "other signals" in the figure). It should be understood that the ISAC signal may also contain more than three symbols or two symbols. It should also be understood that the perceptual reference signal may not be the first symbol of the ISAC signal, such as the second symbol. As shown in Figure 14, the frequency domain resources scheduled for the first signal do not overlap with the frequency domain resources scheduled for the ISAC signal, but they overlap in time. The overlapping portion includes the time resources scheduled for the CRS. The overlap referred to in the embodiments of the present application can be complete or partial. For example, as shown in Figure 14, the first signal, whose frequency is higher than the ISAC signal, completely overlaps with the ISAC signal in time. For another example, as shown in Figure 14, the first signal, whose frequency is lower than the ISAC signal, completely and partially overlaps with the ISAC signal in time. As shown in Figure 14, the guard band on one side (i.e., the left or right side) can be divided into two parts: one part is within the CRS scheduling bandwidth; the other part, the guard band extension, occupies part of the time-frequency resources scheduled for the first signal. The portion of the time-frequency resources scheduled for the first signal occupied by the guard band extension is not used for signal transmission. Alternatively, the first signal is rate-matched based on the CRS sequence and the guard band. Accordingly, the network device needs to indicate / inform the communication device (e.g., terminal device) transmitting or receiving the first signal that the time-frequency resources occupied by the guard band extension are not used for signal transmission. Furthermore, based on the received indication / notification, the communication device sending or receiving the first signal performs rate matching. The embodiments of the present application will introduce a specific rate matching method in the following examples.

[0162] In an embodiment of the present application, when the sum of the bandwidth occupied by the sensing sequence and the guard band is greater than the scheduling bandwidth of the sensing reference signal, in one possible implementation, the sum of the bandwidth occupied by the sensing sequence and the guard band corresponds to a non-integer number of RBs. In this solution, the length of the extended portion of the guard band is more flexible and can save frequency domain resources.

[0163] Exemplarily, the number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula:

[0164] The number of subcarriers corresponding to the other guard band of the two guard bands of the sensing sequence satisfies the following formula:

[0165] Among them, the Indicates rounding down, the Round up, and x1 is a positive integer.

[0166] Or, in other words, the number of subcarriers corresponding to the left guard band of the sensing sequence satisfies the following formula:

[0167] The number of subcarriers corresponding to the right guard band of the sensing sequence satisfies the following formula:

[0168] Alternatively, the number of subcarriers corresponding to the left guard band of the sensing sequence satisfies the following formula:

[0169] The number of subcarriers corresponding to the right guard band of the sensing sequence satisfies the following formula:

[0170] For the description of the left protection band and the right protection band, please refer to the description in the above example, and the embodiments of the present application will not be repeated here.

[0171] In an embodiment of the present application, when the sum of the bandwidth occupied by the sensing sequence and the guard band is greater than the scheduling bandwidth of the sensing reference signal, in another possible implementation, the sum of the bandwidth occupied by the sensing sequence and the guard band corresponds to an integer number of RBs. In this solution, the length of the extended portion of the guard band is a multiple of 6, which can simplify signaling. For example, this signaling can indicate / inform a communication device sending or receiving a first signal that no signal is transmitted on the time-frequency resources occupied by the extended portion of the guard band.

[0172] Exemplarily, the number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula:

[0173] The number of subcarriers corresponding to the other guard band of the two guard bands of the sensing sequence satisfies the following formula:

[0174] Among them, the Indicates rounding down, the Round up, and x2 is a positive integer.

[0175] Or, in other words, the number of subcarriers corresponding to the left guard band of the sensing sequence satisfies the following formula:

[0176] The number of subcarriers corresponding to the right guard band of the sensing sequence satisfies the following formula:

[0177] Alternatively, the number of subcarriers corresponding to the left guard band of the sensing sequence satisfies the following formula:

[0178] The number of subcarriers corresponding to the right guard band of the sensing sequence satisfies the following formula:

[0179] For the description of the left protection band and the right protection band, please refer to the description in the above example, and the embodiments of the present application will not be repeated here.

[0180] It should be noted that Can also be written as Can also be written as The embodiment of the present application does not limit the specific form of the formula for the protection bands on both sides.

[0181] In an embodiment of the present application, when the sum of the bandwidth occupied by the sensing sequence and the guard band is greater than the scheduling bandwidth of the sensing reference signal, in another possible implementation, the sum of the bandwidth occupied by the sensing sequence and the guard band corresponds to an integer number of RBs, and the extended portion of the guard band corresponds to an integer number of RBs. In this solution, the length of the extended portion of the guard band is a multiple of 12, which can further simplify signaling. For example, this signaling can indicate / inform a communication device sending or receiving a first signal that no signal is transmitted in the time-frequency resources occupied by the extended portion of the guard band.

[0182] Exemplarily, the number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula:

[0183] The number of subcarriers corresponding to the other guard band of the two guard bands of the sensing sequence satisfies the following formula:

[0184] in, Indicates rounding down, indicating Round up, x3 is a positive integer.

[0185] Or, in other words, the number of subcarriers corresponding to the left guard band of the sensing sequence satisfies the following formula:

[0186] The number of subcarriers corresponding to the right guard band of the sensing sequence satisfies the following formula:

[0187] The number of subcarriers corresponding to the left guard band of the sensing sequence satisfies the following formula:

[0188] The number of subcarriers corresponding to the right guard band of the sensing sequence satisfies the following formula:

[0189] Compared with the above example (i.e., the x2-related example), the frequency domain resources used by the first signal to transmit the signal (i.e., the frequency domain resources remaining after removing the frequency domain resources occupied by the extension part of the guard band from the frequency domain resources scheduled by the first signal) still correspond to an integer number of RBs.

[0190] It should be noted that Can also be written as Can also be written as The embodiment of the present application does not limit the specific form of the formula for the protection bands on both sides.

[0191] In the embodiment of the present application, the design of x1, x2, or x3 is related to the ICI level threshold, the actual ICI level and For example, the ICI level may be the power of ICI. For example, given an ICI level threshold and In this case, the values ​​of x1, x2, or x3 are positively correlated with the actual ICI level. The larger the actual ICI level, the larger the values ​​of x1, x2, or x3.

[0192] For example, the actual ICI level may be related to the subcarrier spacing corresponding to the sensing reference signal, the phase noise level in the echo signal, the relative moving speed between the target to be sensed and the echo signal receiver (or the Doppler frequency of the echo signal), etc.

[0193] Exemplarily, ICI will significantly affect υ subcarriers, where υ is a positive integer. This can be understood as the subcarrier with a subcarrier index of k0 will significantly affect the υ subcarriers with subcarrier indexes from k0-υ to k0-1, or the subcarrier with a subcarrier index of k0 will significantly affect the υ subcarriers with subcarrier indexes from k0+1 to k0+υ. Exemplarily, causing a significant impact can be understood as the ICI generated by the subcarrier with a subcarrier index of k0 on the υ subcarriers with subcarrier indexes from k0-υ to k0-1, the level of which is greater than or equal to the ICI level threshold; or, the ICI generated by the subcarrier with a subcarrier index of k0 on the υ subcarriers with subcarrier indexes from k0+1 to k0+υ, the level of which is greater than or equal to the ICI level threshold. Not causing a significant impact or the impact can be ignored can be understood as the generated ICI level is lower than the ICI level threshold.

[0194] For example, However, ICI will significantly affect 10 subcarriers. In this case, x1 is not less than 5, so that the ICI of the first signal on the perceived sequence can be ignored.

[0195] For example, However, ICI will significantly affect 10 subcarriers. In this case, x2 can be set to 1, so that the ICI of the first signal on the perceived sequence can be ignored.

[0196] For example, However, ICI will significantly affect 10 subcarriers. In this case, x3 can be set to 1, so that the ICI of the first signal on the perceived sequence can be ignored.

[0197] In an embodiment of the present application, x1, x2 or x3 is predefined, or x1, x2 or x3 is configured by a network device through at least one of radio resource control (RRC), media access control layer-control element (MAC-CE), and downlink control information (DCI).

[0198] The rate matching is explained below. For example, when there is no guard band extension, the frequency domain resources scheduled by the first signal correspond to 36 subcarriers (i.e., 3 RBs), and the time domain resources scheduled by the first signal correspond to 3 symbols. Therefore, a total of 36*3=108 resource elements (REs) can be used to transmit data. Assume that the data symbol transmitted on the subcarrier is a QPSK symbol, a QPSK symbol carries two bits, and the encoding and decoding rate is 0.5. Then the time-frequency resources corresponding to the first signal can transmit 36*3*2*0.5=108 information bits.

[0199] When there is guard band extension, for example, x1=6, then 36*3-6=102 REs are available for data transmission. Since the first signal is still required to carry / transmit 108 information bits, the encoding and decoding rate becomes 108 / 102 / 2=0.5294.

[0200] S1220: The first node outputs a sensing reference signal. Correspondingly, the second node receives an echo signal after the sensing reference signal is affected by the target.

[0201] In the embodiment of the present application, the first node outputting the perception reference signal may be replaced by the first node sending the perception reference signal, or other descriptions, which are not limited in the embodiment of the present application.

[0202] In the embodiment of the present application, the effect of the target on the perception reference signal may be reflection, refraction, scattering, or other effects, which is not limited in the embodiment of the present application.

[0203] S1230: The second node senses the target according to the echo signal.

[0204] In an embodiment of the present application, the second node senses the target based on the echo signal and can obtain information about the speed and distance of the target, or can obtain other information about the target, which is not limited in this embodiment of the present application.

[0205] In the communication method provided in an embodiment of the present application, the length of the sensing sequence corresponding to the sensing reference signal and the number M of subcarriers corresponding to the scheduling bandwidth of the sensing reference signal satisfy a first relationship, and the remaining bandwidth of the sensing sequence corresponding to the sensing reference signal serves as a guard band. This, on the one hand, enables the expansion of the sensing reference signal's adaptive scheduling bandwidth; on the other hand, the presence of the guard band can reduce inter-subcarrier interference of the sensing reference signal and improve the sensing performance of the sensing reference signal. Furthermore, the sum of the bandwidth occupied by the sensing sequence and the guard band of the sensing sequence is greater than or equal to the scheduling bandwidth of the sensing reference signal, thereby ensuring the sensing performance of the sensing reference signal, particularly the sensing performance of the sensing reference signal in high-speed scenarios.

[0206] The above mainly introduces the solutions provided by the embodiments of the present application from the perspective of the interaction between the first node and the second node. Accordingly, the embodiments of the present application also provide a communication device, which is used to implement the various methods described above. The communication device can be the first node in the above method embodiment, or a device including the above first node, or a component that can be used for the first node; or the communication device can be the second node in the above method embodiment, or a device including the above second node, or a component that can be used for the second node. It can be understood that in order to implement the above functions, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. It should be readily appreciated by those skilled in the art that, in combination with the units and algorithm steps of the various examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a computer software-driven hardware manner depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0207] In the embodiment of the present application, the communication device can be divided into functional modules according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be understood that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. In actual implementation, there may be other division methods.

[0208] For example, Figure 15 is a schematic diagram of a communication device provided in an embodiment of the present application. Taking the communication device as the first node in the above method embodiment (which can be a chip of the first node, or a module of the first node, or a device inside the first node) as an example, the first node includes a transceiver module 1510 and a processing module 1520. The transceiver module 1510, which can also be called a transceiver unit, is used to implement the transceiver function, and can be, for example, a transceiver circuit, a transceiver, a transceiver, or a communication interface.

[0209] In this embodiment of the present application, processing module 1520 is configured to obtain a sensing reference signal. The sensing reference signal carries a sensing sequence, wherein the length of the sensing sequence and the number M of subcarriers corresponding to the scheduling bandwidth of the sensing reference signal satisfy a first relationship, where M is divisible by 12, and the sum of the bandwidth occupied by the sensing sequence and the guard band of the sensing sequence is greater than or equal to the scheduling bandwidth of the sensing reference signal.

[0210] In the embodiment of the present application, the transceiver module 1510 is configured to output a perception reference signal.

[0211] Alternatively, taking the communication device as the second node in the above method embodiment (which may be a chip of the second node, a module of the second node, or an internal device of the second node) as an example, the second node includes a transceiver module 1510 and a processing module 1520. The transceiver module 1510, which may also be referred to as a transceiver unit, is used to implement transceiver functions, and may be, for example, a transceiver circuit, a transceiver, a transceiver, or a communication interface.

[0212] In this embodiment of the present application, the transceiver module 1510 is configured to receive an echo signal after a target acts on a sensing reference signal. The sensing reference signal carries a sensing sequence. The length of the sensing sequence and the number M of subcarriers corresponding to the scheduling bandwidth of the sensing reference signal satisfy a first relationship, where M is divisible by 12; and the sum of the bandwidth occupied by the sensing sequence and the guard band of the sensing sequence is greater than or equal to the scheduling bandwidth of the sensing reference signal.

[0213] In the embodiment of the present application, the processing module 1520 is used to sense the target according to the echo signal.

[0214] All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here. Optionally, the communication device may further include a storage module 1530, which can be used to store instructions and / or data, and the processing module 1520 can read the instructions and / or data in the storage module 1530.

[0215] In the embodiment of the present application, the first node is presented in the form of various functional modules divided in an integrated manner. The "module" here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and / or other devices that can provide the above functions. In a simple embodiment, those skilled in the art can imagine that the terminal device can take the form of the communication device shown in Figure 11.

[0216] For example, the processor 1111 in the communication device 1100 shown in FIG11 may call computer-executable instructions stored in the memory 1112 to enable the communication device to execute the communication method in the above method embodiment.

[0217] Specifically, the functions / implementation processes of the transceiver module 1510 and the processing module 1520 in FIG15 can be implemented by the processor 1111 in the communication device 1100 shown in FIG11 calling computer-executable instructions stored in the memory 1112. Alternatively, the functions / implementation processes of the processing module 1520 in FIG15 can be implemented by the processor 1111 in the communication device 1100 shown in FIG11 calling computer-executable instructions stored in the memory 1112.

[0218] It should be understood that one or more of the above modules or units can be implemented by software, hardware, or a combination of the two. When any of the above modules or units is implemented in software, the software exists in the form of computer program instructions and is stored in a memory, and a processor can be used to execute the program instructions and implement the above method flow. The processor can be built into an SoC or ASIC, or it can be an independent semiconductor chip. In addition to the core used to execute software instructions to perform calculations or processing within the processor, it can further include necessary hardware accelerators, such as field programmable gate arrays (FPGAs), programmable logic devices (PLDs), or logic circuits that implement dedicated logic operations.

[0219] When the above modules or units are implemented in hardware, the hardware can be any one or any combination of a CPU, a microprocessor, a digital signal processing (DSP) chip, a microcontroller unit (MCU), an artificial intelligence processor, an ASIC, a SoC, an FPGA, a PLD, a dedicated digital circuit, a hardware accelerator or a non-integrated discrete device, which can run the necessary software or not rely on the software to execute the above method flow.

[0220] Optionally, an embodiment of the present application further provides a communication device (for example, the communication device may be a chip or a chip system), which includes a processor for implementing the method in any of the above method embodiments. In one possible design, the communication device also includes a memory. The memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication device to execute the method in any of the above method embodiments. Of course, the memory may not be in the communication device. When the communication device is a chip system, it may be composed of a chip, or it may include a chip and other discrete devices, which is not specifically limited in the embodiment of the present application.

[0221] Optionally, an embodiment of the present application also provides a computer-readable storage medium, which stores a computer program or instruction. When the computer program or instruction is run on a communication device, the communication device can execute the method described in any of the above method embodiments or any of its implementation methods.

[0222] Optionally, an embodiment of the present application further provides a communication system, which includes the first node described in the above method embodiment and the second node described in the above method embodiment. Optionally, the communication system also includes the third node described in the above method embodiment.

[0223] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented using a software program, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions according to the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more media integrated therein. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state drives (SSDs)).

[0224] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0225] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, the present application is intended to encompass such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

Claims

1. A communication method, characterized in that: include: Acquiring a sensing reference signal, where the sensing reference signal carries a sensing sequence, a length of the sensing sequence and a number M of subcarriers corresponding to a scheduling bandwidth of the sensing reference signal satisfy a first relationship, where M is divisible by 12; and a sum of a bandwidth occupied by the sensing sequence and a guard band of the sensing sequence is greater than or equal to the scheduling bandwidth of the sensing reference signal; The perception reference signal is output.

2. A communication method, characterized in that: include: receiving an echo signal after a target acts on a sensing reference signal, where the sensing reference signal carries a sensing sequence, a length of the sensing sequence and a number M of subcarriers corresponding to a scheduling bandwidth of the sensing reference signal satisfy a first relationship, where M is divisible by 12; and a sum of a bandwidth occupied by the sensing sequence and a guard band of the sensing sequence is greater than or equal to the scheduling bandwidth of the sensing reference signal; The target is sensed according to the echo signal.

3. The method according to claim 1 or 2, characterized in that The first relationship satisfies the following formula: Among them, the is the length of the perception sequence, the first factor n0 is a positive integer, and the second factor δ∈{0,1,2}.

4. The method according to any one of claims 1 to 3, characterized in that The first factor n0 is the maximum positive integer that satisfies the first relationship.

5. The method according to claim 3 or 4, characterized in that When the second factor δ=0, the perception sequence is one of the Golay complementary sequences; when the second factor δ=1, the perception sequence is the longest linear shift register sequence or the golden sequence; when the second factor δ=2, the perception sequence is generated based on the ZC sequence.

6. The method according to any one of claims 3 to 5, characterized in that The number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula: The number of subcarriers corresponding to the other guard band of the two side guard bands of the sensing sequence satisfies the following formula: Among them, the Indicates rounding down, Indicates rounding up.

7. The method according to any one of claims 3 to 5, characterized in that In the case that the sum of the bandwidth occupied by the sensing sequence and the guard band is greater than the scheduling bandwidth of the sensing reference signal, the sum of the bandwidth occupied by the sensing sequence and the guard band corresponds to a non-integer or integer number of physical resource blocks (RBs).

8. The method according to claim 7, characterized in that The number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula: The number of subcarriers corresponding to the other guard band of the two side guard bands of the sensing sequence satisfies the following formula: Wherein, x1 is a positive integer.

9. The method according to claim 7, characterized in that The number of subcarriers corresponding to one of the guard bands on both sides of the sensing sequence satisfies the following formula: The number of subcarriers corresponding to the other guard band of the two side guard bands of the sensing sequence satisfies the following formula: Wherein, x2 is a positive integer.

10. The method according to claim 8 or 9, characterized in that The x1 or the x2 is predefined, or the x1 or the x2 is configured by the network device through at least one of the radio resource control RRC, the media access control layer-control unit MAC-CE, and the downlink control information DCI.

11. The method according to claim 7, characterized in that Some time-frequency resources scheduled by the first signal are not used to send signals, and the part of the time-frequency resources overlap with the time-frequency resources occupied by the sensing sequence and the time-frequency resources occupied by the guard band of the sensing sequence.

12. A communication device, characterized in that: The communication device comprises a module for executing the method according to any one of claims 1 , 3 to 11 , or comprises a module for executing the method according to any one of claims 2 to 11 .

13. A communication device, characterized in that: The communication device includes a processor; the processor is configured to execute the method according to any one of claims 1, 3 to 11, or cause the communication device to execute the method according to any one of claims 2 to 11.

14. A computer-readable storage medium, characterized in that The computer-readable storage medium comprises instructions, which, when executed, enable the method according to any one of claims 1, 3 to 11 to be implemented, or enable the method according to any one of claims 2 to 11 to be implemented.

15. A computer program product, characterized in that The computer program product comprises instructions which, when executed, cause the method according to any one of claims 1, 3 to 11 to be implemented, or cause the method according to any one of claims 2 to 11 to be implemented.

16. A communication system, characterized in that: The communication system includes the communication device according to claim 12 and claim 13.

Images