WO2022183979A1

WO2022183979A1 - Synchronization signal transmission method and apparatus, and device and storage medium

Info

Publication number: WO2022183979A1
Application number: PCT/CN2022/077886
Authority: WO
Inventors: 袁璞; 刘昊
Original assignee: 维沃移动通信有限公司
Priority date: 2021-03-01
Filing date: 2022-02-25
Publication date: 2022-09-09
Also published as: CN115001644A

Abstract

The present application belongs to the technical field of communications. Disclosed are a synchronization signal transmission method and apparatus, and a device and a storage medium. The method comprises: a first communication device generating a synchronization signal sequence mapped in a delay Doppler domain; and transmitting a time domain sampling point of the synchronization signal sequence in the delay Doppler domain.

Description

Synchronization signal transmission method, device, equipment and storage medium

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application with the application number 2021102271370 filed on March 1, 2021 and the invention title is "Synchronous Signal Transmission Method, Apparatus, Equipment and Storage Medium", which is fully incorporated into this application by reference .

technical field

The present application belongs to the field of communication technologies, and in particular relates to a synchronization signal transmission method, apparatus, device and storage medium.

Background technique

The initial access of the terminal generally relies on the synchronization signal.

In the related art, the synchronization technology is based on the orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) that is OFDM modulation and the New Radio (New Radio, NR) frame structure. When the synchronization timing function of the Orthogonal Time Frequency (OTFS) system is used, the device may need to frequently switch the modulation mode between the broadcast channel and the data channel, which increases the complexity of implementation; and the synchronization signal block (Synchronization signal block, Primary synchronization signal (PSS) in SSB)-secondary synchronization signal (SSS) binary structure and synchronization signal (synchronization signal, SS) coupled with the main message block (Master information block, MIB) The design is more redundant to the OTFS system.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present application is to provide a synchronization signal transmission method, apparatus, device and storage medium, which can simplify the synchronization detection step on the receiving side after the synchronization signal is transmitted.

In a first aspect, a synchronization signal transmission method is provided, the method comprising:

The first communication device generates a synchronization signal sequence mapped in the delayed Doppler domain;

The first communication device transmits the time domain sampling points of the synchronization signal sequence.

In a second aspect, a synchronization signal transmission method is provided, the method comprising:

The second communication device receives the time domain sampling points of the synchronization signal sequence;

The second communication device performs synchronization timing detection on the time domain sampling points of the synchronization signal sequence.

In a third aspect, a synchronization signal transmission device is provided, the device comprising:

a first generation module, configured to generate a synchronization signal sequence mapped in the delayed Doppler domain;

The first transmission module is configured to transmit the time domain sampling points of the synchronization signal sequence.

In a fourth aspect, a synchronization signal transmission device is provided, the device comprising:

a first receiving module, configured to receive the time domain sampling points of the synchronization signal sequence;

The first detection module is configured to perform synchronization timing detection on the time domain sampling points of the synchronization signal sequence.

In a fifth aspect, a communication device is provided, comprising a processor, a memory, and a program or instruction stored on the memory and executable on the processor, the program or instruction being implemented when executed by the processor The steps of the method of the first aspect.

In a sixth aspect, a communication device is provided, comprising a processor, a memory, and a program or instruction stored on the memory and executable on the processor, the program or instruction being implemented when executed by the processor The steps of the method of the second aspect.

In a seventh aspect, a readable storage medium is provided, and a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the steps of the method described in the first aspect, or the The steps of the method of the second aspect.

In an eighth aspect, a chip is provided, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement the method according to the first aspect steps, or steps of implementing the method according to the second aspect.

In the embodiment of the present application, by using the synchronization signal sequence as the synchronization signal for transmission in the delayed Doppler domain, the good autocorrelation and cross-correlation performance of the synchronization signal is maintained, and the synchronization detection step on the receiving side is simplified, which is suitable for simplified OTFS The engineering implementation avoids the additional complexity caused by inserting synchronization signals in the time-frequency domain.

Description of drawings

FIG. 1 shows a block diagram of a wireless communication system to which an embodiment of the present application can be applied;

2 is a schematic diagram of the mutual conversion between the delay Doppler domain and the time-frequency plane provided by an embodiment of the present application;

3 is a schematic diagram of a channel response relationship under different planes provided by an embodiment of the present application;

4 is a schematic diagram of a process flow diagram of a transceiver end of an OTFS multi-carrier system provided by an embodiment of the present application;

5 is a schematic diagram of pilot resource multiplexing in the delayed Doppler domain provided by an embodiment of the present application;

6 is a schematic diagram of detection of a pilot sequence provided by an embodiment of the present application;

7 is a schematic diagram of a synchronization signal design provided by an embodiment of the present application;

FIG. 8 is one of the schematic flowcharts of the synchronization signal transmission method provided by the embodiment of the present application. FIG. 9 is a schematic diagram of the engineering implementation of the OTFS system provided by the embodiment of the present application;

10 is a schematic diagram of transforming a delayed Doppler-domain sequence into a time-domain sampling point provided by an embodiment of the present application;

11 is a schematic diagram of pilot overhead provided by the implementation of the present application;

FIG. 12 is a second schematic flowchart of a synchronization signal transmission method provided by an embodiment of the present application;

FIG. 13 is one of the schematic structural diagrams of the synchronization signal transmission apparatus provided by the embodiment of the present application;

FIG. 14 is a second schematic structural diagram of a synchronization signal transmission apparatus provided by an embodiment of the present application;

FIG. 15 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

16 is a schematic diagram of a hardware structure of a terminal provided by an embodiment of the present application;

FIG. 17 is a schematic diagram of a hardware structure of a network side device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of this application.

The terms "first", "second" and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and "first", "second" distinguishes Usually it is a class, and the number of objects is not limited. For example, the first object may be one or multiple. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the associated objects are in an "or" relationship.

It is worth noting that the technologies described in the embodiments of this application are not limited to Long Term Evolution (LTE)/LTE-Advanced (LTE-Advanced, LTE-A) systems, and can also be used in other wireless communication systems, such as code Division Multiple Access (Code Division Multiple Access, CDMA), Time Division Multiple Access (Time Division Multiple Access, TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA), Orthogonal Frequency Division Multiple Access (Orthogonal Frequency Division Multiple Access, OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used not only for the above-mentioned systems and radio technologies, but also for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and uses NR terminology in most of the description below, but these techniques can also be applied to applications other than NR system applications, such as 6th Generation (6th Generation) , 6G) communication system.

FIG. 1 shows a block diagram of a wireless communication system to which the embodiments of the present application can be applied. The wireless communication system includes a terminal 11 and a network-side device 12 . Wherein, the terminal 11 may also be referred to as a terminal device or a user terminal (User Equipment, UE), and the terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital Assistant (Personal Digital Assistant, PDA), PDA, Netbook, Ultra-mobile Personal Computer (UMPC), Mobile Internet Device (MID), Augmented Reality (AR)/Virtual Reality (virtual reality, VR) device, robot, wearable device (Wearable Device), vehicle-mounted device (VUE), pedestrian terminal (PUE), smart home (home devices with wireless communication functions, such as refrigerators, TVs, washing machines or furniture etc.), game consoles, personal computers (PCs), teller machines or self-service machines and other terminal-side devices, wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart Bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. It should be noted that, the embodiment of the present application does not limit the specific type of the terminal 11 . The network side device 12 may include an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or Radio access network unit. The access network device 12 may include a base station, a WLAN access point, or a WiFi node, etc., and the base station may be referred to as a Node B, an evolved Node B, an access point, a Base Transceiver Station (BTS), a radio base station, a radio base station, or a radio base station. Transceiver, Basic Service Set (BSS), Extended Service Set (Extended Service Set, ESS), Home Node B, Home Evolved Node B, Transmitting Receiving Point (TRP) or in the field For some other suitable term, as long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that, in the embodiments of this application, only the base station in the NR system is used as an example, but it does not limit the base station. specific type. The core network equipment may include, but is not limited to, at least one of the following: core network node, core network function, mobility management entity (Mobility Management Entity, MME), access mobility management function (Access and Mobility Management Function, AMF), session management function (Session Management Function, SMF), User Plane Function (UPF), Policy Control Function (Policy Control Function, PCF), Policy and Charging Rules Function (Policy and Charging Rules Function, PCRF), edge application services Discovery function (Edge Application Server Discovery Function, EASDF), Unified Data Management (Unified Data Management, UDM), Unified Data Repository (Unified Data Repository, UDR), Home Subscriber Server (Home Subscriber Server, HSS), centralized network configuration ( Centralized network configuration, CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (Local NEF, or L-NEF), Binding Support Function (Binding Support Function, BSF), Application Function (AF), etc. It should be noted that, in the embodiments of the present application, only the core network device in the NR system is used as an example for introduction, and the specific type of the core network device is not limited.

The synchronization signal transmission method and apparatus provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through some embodiments and application scenarios thereof.

For the convenience of description, the following contents are first introduced:

Downlink control message, Downlink control information, DCI;

Physical downlink control channel, Physical downlink control channel, PDCCH;

Physical downlink shared channel, Physical downlink shared channel, PDSCH;

Physical resource control, Radio resource control, RRC;

Physical broadcast channel, Physical broadcast channel, PBCH;

Master message block, Master information block, MIB;

System message block, System information block, SIB;

Resource element, Resource element, RE;

Code division multiplexing, Code division multiplexing, CDM;

Orthogonal cover code, Orthogonal cover code, OCC;

Mean square error, Mean square error, MSE;

Orthogonal frequency division multiplexing, OFDM;

Bit error rate, Bit error rate, BER;

Bit error rate, Block error rate, BLER;

Single frequency network, Single frequency network, SFN;

Synchronization signal block, Synchronization signal block, SSB;

Primary synchronization signal, Primary synchronization signal, PSS;

Secondary synchronization signal, Secondary synchronization signal, SSS;

Demodulation reference signal, Demodulation reference signal, DMRS;

Discrete Fourier transform, Discrete Fourier transform, DFT;

Fast Fourier transform, Fast Fourier transform, FFT;

Inverse fast Fourier transform, Inverse fast Fourier transform, IFFT;

Symplectic Fourier transform, Symplectic Fourier transform, SFFT;

Inverse symplectic Fourier transform, Inverse symplectic Fourier transform, ISFFT;

Linear feedback shift register Linear feedback shift register, LFSR.

In the complex electromagnetic wave transmission environment in the city, due to the existence of a large number of scattering, reflection and refraction surfaces, the time when the wireless signal reaches the receiving antenna through different paths is different, that is, the multipath effect of transmission. Inter-symbol interference (ISI) occurs when the preceding and following symbols of a transmitted signal arrive at the same time through different paths, or in other words, when the latter symbol arrives within the delay spread of the previous symbol. Similarly, in the frequency domain, due to the Doppler effect caused by the relative speed of the transceiver, each sub-carrier where the signal is located will have different degrees of offset in frequency, causing the sub-carriers that might be orthogonal to overlap, that is, Inter-carrier interference (ICI). The Orthogonal Frequency Division Multiplexing (OFDM) multi-carrier system used in the communication system has better anti-ISI performance by adding a cyclic prefix (CP) design. However, the weakness of OFDM is that the size of the sub-carrier spacing is limited. Therefore, in response to high-speed mobile scenarios (such as high-speed rail), due to the large Doppler frequency shift caused by the relatively large relative speed between the transmitter and the receiver, the distance between the OFDM sub-carriers is destroyed. The orthogonality between subcarriers causes serious ICI between subcarriers.

The Orthogonal Time Frequency Space (OTFS) technology is proposed to solve the above problems in the OFDM system. The OTFS technique defines the transformation between the delay Doppler domain and the time-frequency domain. By simultaneously mapping service data and pilots to the delayed Doppler domain at the transceiver end, the delay and Doppler characteristics of the channel are captured by designing pilots in the delayed Doppler domain, and the guard interval is designed to avoid OFDM. The pilot contamination problem caused by the ICI in the system makes the channel estimation more accurate and helps the receiving end to improve the success rate of data decoding.

In the OTFS technology, a guard interval is required around the pilot symbol located in the delayed Doppler domain, and the size of the guard interval is related to the channel characteristics. By measuring the channel, the present application dynamically adjusts the size of the guard interval of the pilot symbol according to the channel characteristics, so as to ensure that the pilot overhead is approximately minimized under the premise of satisfying the system design, avoiding that the worst-case band is always considered in the traditional scheme. The problem of wasting resources.

The delay and Doppler characteristics of the channel are essentially determined by the multipath channel. Signals arriving at the receiver through different paths have different arrival times because of differences in propagation paths. For example, two echoes s ₁ and s ₂ respectively travel distances d ₁ and d ₂ to reach the receiving end, then the time difference between them arriving at the receiving end is:

where c is the speed of light.

Due to this time difference between the echoes s ₁ and s ₂ , their coherent superposition at the receiver side causes the observed signal amplitude jitter, ie fading effect. Similarly, the Doppler spread of multipath channels is also caused by multipath effects.

The Doppler effect is due to the relative velocities at the two ends of the transceiver, and the signals arriving at the receiving end through different paths have different incident angles with respect to the antenna normal, thus causing the difference in relative velocities, which in turn causes the Doppler effects of signals on different paths. The frequency shift is different. It is assumed that the original frequency of the signal is f ₀ , the relative velocity of the transceiver is Δv, and the angle between the signal and the normal incidence of the antenna at the receiving end is θ. Then there are:

Obviously, when the two echoes s ₁ and s ₂ travel through different paths to reach the receiving end antenna and have different incident angles θ ₁ and θ ₂ , the Doppler frequency shifts Δf ₁ and Δf ₂ obtained by them are also different.

To sum up, the signal received by the receiving end is the superposition of component signals with different time delays and Dopplers from different paths, and the whole is embodied as a received signal with fading and frequency shift relative to the original signal. The delay Doppler analysis of the channel is helpful to collect the delay Doppler information of each path, so as to reflect the delay Doppler response of the channel.

The full name of OTFS modulation technology is Orthogonal Time-Frequency Spatial Domain Modulation. This technology logically maps the information in a data packet of size M×N, such as Quadrature Amplitude Modulation (QAM) symbols, to an M×N lattice point in the two-dimensional delay Doppler domain. , that is, the pulses within each lattice point modulate one QAM symbol in the packet.

FIG. 2 is a schematic diagram of the mutual conversion between the delayed Doppler domain and the time-frequency plane provided by an embodiment of the present application. As shown in FIG. 2 , by designing a set of orthogonal two-dimensional basis functions, the M×N delayed Doppler domain is converted into The data set on the plane is transformed to the N×M time-frequency domain plane, which is mathematically called the Inverse Sympetic Fast Fourier Transform (ISFFT). Correspondingly, the transformation from the time-frequency domain to the delayed Doppler domain is called the Sympletic Fourier Transform. The physical meaning behind it is that the delay and Doppler effect of the signal are actually a linear superposition effect of a series of echoes with different time and frequency offsets after the signal passes through multiple channels. In this sense, the delay Doppler analysis and the time-frequency domain analysis can be obtained by mutual conversion of the ISFFT and SSFT described above.

Therefore, the OTFS technology transforms the time-varying multipath channel into a time-invariant two-dimensional delay Doppler domain channel (within a certain duration), which directly reflects the relative relationship between the reflectors between the transceivers in the wireless link. The channel delay Doppler response characteristic caused by the geometry of the location. The advantage of this is that OTFS eliminates the difficulty of tracking the time-varying fading characteristics of traditional time-frequency domain analysis, and instead extracts all the diversity characteristics of the time-frequency domain channel through delay Doppler domain analysis. In practical systems, the channel impulse response matrix represented by the delayed Doppler domain is sparse because the number of delay paths and Doppler frequency shifts of the channel is much smaller than the number of time domain and frequency domain responses of the channel. Using the OTFS technology to analyze the sparse channel matrix in the delay Doppler domain can make the packaging of reference signals more compact and flexible, which is especially beneficial to support large antenna arrays in massive MIMO systems.

The core of OTFS modulation is to define QAM symbols in the delayed Doppler domain, transform them into the time-frequency domain for transmission, and then return to the delayed Doppler domain for processing at the receiving end. Therefore, a wireless channel response analysis method in the delayed Doppler domain can be introduced.

FIG. 3 is a schematic diagram of the channel response relationship under different planes provided by an embodiment of the present application. As shown in FIG. 3 , when a signal passes through a linear time-varying wireless channel, the channel response is expressed under different planes. The relationship between.

In Figure 3, the SFFT transform formula is:

h(τ,ν)=∫∫H(t,f)e ^{-j2π(νt-fτ)} dτdν; (1)

Correspondingly, the transformation formula of ISFFT is:

H(t,f)=∫∫h(τ,ν)e j2π( ^νt-fτ) dτdν; (2)

When the signal passes through a linear time-varying channel, let the time-domain received signal be r(t), the corresponding frequency-domain received signal is R(f), and there are

r(t) can be expressed in the following form:

r(t)=s(t)*h(t)=∫g(t,τ)s(t-τ)dτ; (3)

It can be seen from the relationship in Figure 3 that

g(t,τ)=∫h(ν,τ)e ^j2πνt dν; (4)

Substitute (4) into (3) to get:

r(t)=∫∫h(ν,τ)s(t-τ)e ^j2πνt dτdν; (5)

From the relationship shown in Figure 3, the classical Fourier transform theory, and formula (5), it can be known that:

Equation (6) implies that the analysis of the delay Doppler domain in the OTFS system can be realized by adding an additional signal processing process at the transceiver end by relying on the communication framework established in the time-frequency domain in the related art. Moreover, the additional signal processing only consists of Fourier transform, which can be completely implemented by hardware in the related art, without adding new modules. This good compatibility with the hardware system in the related art greatly facilitates the application of the OTFS system. In an actual system, the OTFS technology can be easily implemented as a pre- and post-processing module of a filtered OFDM system, so it has good compatibility with the multi-carrier system in the related art.

When OTFS is combined with a multi-carrier system, the implementation of the transmitting end is as follows: the QAM symbols containing the information to be transmitted are carried by the waveform of the delayed Doppler domain, and undergo a two-dimensional inverse symplectic Fourier transform (Inverse Sympletic Fast Finite Fourier Transform, ISFFT), converted to the waveform of the time-frequency domain plane in the traditional multi-carrier system, and then through the symbol-level one-dimensional inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT) and serial-parallel conversion, become time-domain sampling points send out.

The receiving end of the OTFS system is roughly an inverse process of the sending end: after the time domain sampling points are received by the receiving end, they undergo parallel transformation and symbol-level one-dimensional Fast Fourier Transform (FFT), and then transform to the time The waveform on the frequency domain plane is then converted into a waveform on the delayed Doppler domain plane through a two-dimensional symplectic Fourier transform (Sympletic Finite Fourier Transform, SFFT), and then the QAM symbols carried by the delayed Doppler domain waveform are processed. Processing at the receiving end: including but not limited to channel estimation and equalization, demodulation and decoding, etc.

FIG. 4 is a schematic diagram of a processing flow of a transceiver end of an OTFS multi-carrier system provided by an embodiment of the present application.

The advantages of OTFS modulation are mainly reflected in the following aspects:

1) OTFS modulation converts a time-varying fading channel in the time-frequency domain between transceivers into a deterministic fading-free channel in the delay-Doppler domain. In the delayed Doppler domain, each symbol in a set of information symbols sent at a time experiences the same static channel response and SNR.

2) The OTFS system analyzes the reflectors in the physical channel by delaying the Doppler image, and uses the receive equalizer to coherently combine the energy from different reflection paths, which actually provides a static channel response without fading. Using the above-mentioned static channel characteristics, the OTFS system does not need to introduce closed-loop channel adaptation to cope with the fast-changing channel like the OFDM system, thus improving the system robustness and reducing the complexity of system design.

3) Since the number of delay-Doppler states in the delay-Doppler domain is much smaller than the number of time-frequency states in the time-frequency domain, the channel in the OTFS system can be expressed in a very compact form. The channel estimation overhead of the OTFS system is less and more accurate.

4) Another advantage of OTFS is to deal with extreme Doppler channels. Through the analysis of delayed Doppler images with appropriate signal processing parameters, the Doppler characteristics of the channel will be fully presented, which is beneficial for signal analysis and processing in Doppler-sensitive scenarios such as high-speed movement and millimeter waves.

Based on the above analysis, a new method can be adopted for channel estimation in the OTFS system. The transmitter maps the pilot pulse on the delayed Doppler domain, and the receiver uses the delayed Doppler image analysis of the pilot to estimate the channel response h(ν, τ) in the delayed Doppler domain, which can then be determined according to Fig. The relationship shown in 3 obtains the channel response expression in the time-frequency domain, which is convenient for signal analysis and processing using the existing technology in the time-frequency domain.

FIG. 5 is a schematic diagram of multiplexing pilot resources in the delayed Doppler domain provided by an embodiment of the present application; as shown in FIG. 5 , the pilot is constructed based on a PN (persudo noise, pseudo-random) sequence generated in a specific manner. The pilot sequence is mapped to the two-dimensional resource grid on the delayed Doppler plane according to specific rules, that is, the shaded part of the slanted line in the figure. In this application, the resource position occupied by the pilot sequence, that is, the shaded part with the oblique line, may be referred to as a pilot resource block. The unshaded area next to the pilot resource block is the pilot guard band, which consists of blank resource elements that do not transmit any signal/data. Similar to the aforementioned single-point pilot, a guard band is also provided around its periphery to avoid mutual interference with data. The calculation method of the guard band width is the same as that in the single-point pilot mapping mode in Figure 5. The difference is that in the resource part mapped by the pilot sequence, the pilot signals of different ports can be generated by selecting sequences with low correlation, superimposing and mapping on the same resource, and then performing the pilot sequence mapping at the receiving end through a specific algorithm. detection, thereby distinguishing pilots corresponding to different antenna ports. Due to complete resource multiplexing at the transmitting end, the pilot overhead in a multi-antenna port system can be greatly reduced.

FIG. 6 is a schematic diagram of detection of a pilot sequence provided by an embodiment of the present application. As shown in FIG. 6 , a detection method based on a sequence pilot is presented. At the receiving end, due to the different delays and Doppler frequency shifts of the two paths of the channel, the received pilot signal block is shifted to the diagonally shaded part in the figure (that is, the square marked with 2 and the The position of the 8 adjacent squares, and the square numbered 3 and the 8 adjacent squares). At this time, using the known transmit pilot (the shaded part of the horizontal line in the figure, that is, the block labeled 1 and the 8 blocks adjacent to the block) at the receiving end, the sliding window detection operation is performed in the delayed Doppler domain. It is known that the sliding window detection operation result M(R,S)[δ,ω] has the following properties when N _P →+∞ (the probability that the following formula holds is close to 1):

in

C>0 is a certain constant.

In the formula, (δ, ω) and (δ ₀ , ω ₀ ) are respectively the current (center point) position of the sliding window and the offset position of the pilot signal block (center point) in the received signal. It can be seen from the formula that only when (δ,ω)=(δ ₀ ,ω ₀ ) can a value near 1 be obtained, otherwise, the result of the sliding window detection operation is a smaller value. Therefore, when the sliding window (the hatched part of the horizontal line in the figure, that is, the block labeled 1 and the 8 blocks adjacent to the block) is exactly the same as the offset pilot signal block (the hatched part of the oblique line in the figure, that is, the labeled block is When the square of 2 and the 8 squares adjacent to the square, and the square labeled 3 and the 8 squares adjacent to the square) coincide, the detection opportunity calculates an energy peak, which is presented in the delay Doppler domain. (δ ₀ , ω ₀ ) position of , that is, the positions of the small squares labeled 2 and 3 in the figure. Using this method, as long as _NP has a sufficient length, the receiver can obtain the correct pilot position according to the value of M(R,S), that is, obtain the delay and Doppler information of the channel. At the same time, the amplitude value of the channel is obtained by the detection operation

value is given.

In the delayed Doppler domain, the general method for constructing a pilot (or reference signal) sequence is as follows. First, a base sequence is generated. The base sequence can be a ZC sequence or a PN sequence. The PN sequence includes the following sequences: M sequence, Gold sequence, Kasami sequence, Barker sequence and so on. Then, the base sequence is modulated to generate a pilot sequence. Optionally, OCC can also be used for the pilot sequence to further improve the orthogonality.

FIG. 7 is a schematic diagram of a synchronization signal design provided by an embodiment of the present application. As shown in FIG. 7 , the initial access of LTE and NR is performed by relying on synchronization signals (including PSS and SSS). to find frame boundaries (timing synchronization). The SSS is the secondary synchronization signal, and indicates the Cell ID together with the PSS. PBCH is a physical broadcast channel, in which MIB messages and DMRS transmit the most important part of system messages for subsequent random access and data transmission.

The system of initial access technology in NR is mainly based on the design of SSB. The base station periodically transmits the SSB for initial access according to the principles set by the protocol (eg, time-frequency domain resource location, transmission period, synchronization signal generation method, etc.). The main process is as follows:

1) Initial network search: including SSB synchronization and reception of system information. Specifically, the primary synchronization information PSS may be received first, then the secondary synchronization information SSS may be received, and then the PBCH may be received: obtain the SSB index, and the information in the PBCH DMRS and MIB.

2) Re-receive the broadcast system information (system information, SI) according to the obtained information, which includes the information required for accessing the system.

3) Perform random access according to the information required for system access obtained above.

The above is the initial access procedure in the NR single base station cell. The UE only accepts the SSB from the current cell, and obtains the system information by detecting the synchronization signals (including PSS and SSS) in the SSB, as well as the reference signal (DMRS) and data information (MIB) in the PBCH, so as to transmit the uplink message. Further random access. In the above process, the pilots (PSS and SSS) used for synchronization are tightly coupled with the data part (content in the PBCH) containing the system message.

In the above-mentioned initial access process, the first thing to be done is the detection of the primary synchronization signal and the PSS, including:

1) The base station periodically sends the SSB for initial access according to the principles set by the protocol (such as time-frequency domain resource location, transmission period, synchronization signal generation method, etc.)

2) Since the UE does not have a priori information on the frame timing boundary in the initial access stage, the UE needs to perform sliding window detection on the received time domain sampling points according to the SSB mapping and transmission rules defined by the protocol. Specifically:

1) The UE buffers a sufficiently long time domain sampling point.

2) The UE generates local time domain samples for detection according to the synchronization signal sequence determined by the protocol

3) The UE defines a sliding detection window, which slides sample by sample on the buffered time domain sample points. Each time a sample point is slid, a correlation operation is performed between the current buffered time-domain sample point in the sliding detection window and the local time-domain sample point to obtain a correlation peak value.

4) After the sliding window traverses all cached time-domain sample points, we obtain a set of correlation peaks. Find the position of the sliding window corresponding to the largest correlation peak in the buffered time domain sampling point, that is, find the position of the synchronization signal on the time domain sampling point.

5) According to the frame structure specified in the protocol, that is, the mapping position of the synchronization signal in the subframe/time slot, we can calculate where the frame boundary is, that is, the synchronization timing is realized.

FIG. 8 is one of the schematic flowcharts of a synchronization signal transmission method provided by an embodiment of the present application. As shown in FIG. 8 , the method includes the following steps:

Step 800, the first communication device generates a synchronization signal sequence mapped in the delayed Doppler domain;

Step 810: The first communication device transmits the time domain sampling points of the synchronization signal sequence.

Optionally, the embodiments of the present application may be applied to the downlink, the first communication device may be a network side device, such as a base station, and in this case, its communication counterpart, that is, the second communication device may be a terminal UE.

Optionally, the embodiment of the present application may be applied to a side link, the first communication device may be a terminal UE, and in this case, its communication counterpart, that is, the second communication device may be a terminal UE.

Optionally, in this embodiment of the present application, the first communication device may be referred to as a sending end, and the second communication device may be referred to as a receiving end.

Optionally, the first communication device may employ a sequence-based synchronization signal sequence for OTFS modulation.

Optionally, the synchronization signal sequence is generated based on a sequence with good autocorrelation and cross-correlation performance. After the first communication device modulates the synchronization signal sequence, it can map it to the delay Doppler domain resource grid, and then convert the synchronization signal sequence from The delay Doppler domain is converted to the time domain for transmission.

Optionally, the synchronization signal sequence is transmitted through pilot frames.

Optionally, after the synchronization signal sequence is changed to the transmitted time domain sampling point by the baseband processing of the OTFS system, good autocorrelation and cross-correlation performance can still be maintained. Therefore, the second communication device, that is, the receiving end, can directly detect the synchronization signal based on the received sampling points in the time domain, and obtain the synchronization timing without additional processing steps.

FIG. 9 is a schematic diagram of an engineering implementation of an OTFS system provided by an embodiment of the present application; as shown in FIG. 9 , the left half is a complete flow of OTFS baseband processing, and the right half is a simplified flow of OTFS baseband processing. Taking Fig. 9 as an example, in the complete process, the data set X mapped on a 2048×128 delayed Doppler resource grid needs to undergo an ISFFT to transform to the time-frequency domain, where the ISFFT is performed by performing operations on the elements of each column. FFT of 2048 points and IFFT of 128 points for each row element. Obtain the dataset X _TF in the time-frequency domain.

Alternatively, the matrix expression for _XTF is:

Among them, F _N is the DFT operator in matrix form, and the left multiplication represents the row-by-row DFT of the matrix, and the right multiplication represents the column-by-column DFT of the matrix. The X _TF needs to be converted into time-domain sampling points for transmission, and the conversion process is the Heisenberg transform in Figure 9. The specific operation is to perform an IFFT operation of 2048 points on each column of _XTF , and then shape and filter column by column to obtain the processed matrix S. After the S is vectorized, the sent time domain sampling points are obtained.

Optionally, the matrix expression for S is:

Thus, a concise input-output relationship between the actually transmitted time-domain pulse sequence S and the delayed-Doppler-domain data set X can be obtained. According to this relationship, the actual engineering implementation can be simplified to the right half of Figure 9. That is, the IFFT of 128 points is performed on the data set X row by row, and then it is shaped and filtered column by column, and then sent after vectorization.

Optionally, the embodiment of the present application proposes a synchronization signal design solution in the delayed Doppler domain in the OTFS modulation system, which is used for initial access of the UE.

Optionally, the embodiments of the present application design a dedicated synchronization mechanism for OTFS modulation, so as to better utilize the advantages of the OTFS system.

The embodiment of the present application uses the synchronization signal sequence as the synchronization signal for transmission in the delayed Doppler domain, maintains good autocorrelation and cross-correlation performance of the synchronization signal, simplifies the synchronization detection step on the receiving side, and is suitable for simplified OTFS engineering implementation. The additional complexity of inserting synchronization signals in the time-frequency domain is avoided.

Optionally, the generating and mapping the synchronization signal sequence in the delayed Doppler domain, including:

A guard band is not reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain; or, a guard band is reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain.

In the case where the synchronization signal sequence is only used for synchronization timing, no guard band is reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain.

Optionally, in the case where the synchronization signal sequence is only used for synchronization timing, that is, the pilot frame where the synchronization signal is located only contains pilots and is only used to find synchronization timing, that is, the receiving side does not need to use the pilots for (Delayed Doppler Domain) Channel Estimation. Therefore, there is no need to reserve a guard band for the mapping of the synchronization signal sequence.

Optionally, since the guard band does not need to be considered, more pilot symbols can be placed in the resource of the same size, thereby enhancing the detection performance; some additional information bits are carried by combining the pilot sequences.

When the synchronization signal sequence is used for synchronization timing and for acquiring channel quality related information, a guard band is reserved for the synchronization signal sequence on the resource grid of the delay Doppler domain.

Optionally, in the case where the synchronization signal sequence is used for synchronization timing and for obtaining information related to channel quality, that is, the pilot frame where the synchronization signal is located only contains pilots, and both delay and Doppler dimensions are predicted. Sufficient guardbands are reserved for channel estimation, providing a function similar to CSI-RS in NR.

Optionally, after the frame timing is found based on the synchronization signal sequence, channel estimation may be further performed to obtain the CSI.

When the synchronization signal sequence is used for synchronization timing and for obtaining channel quality related information, and the pilot frame where the synchronization signal sequence is located includes a data signal, the resource elements and A guard band is reserved between resource elements to which the data signal is mapped.

Optionally, when the synchronization signal sequence is used for synchronizing timing and for obtaining channel quality related information, and the pilot frame where the synchronization signal sequence is located includes a data signal, that is, the pilot where the synchronization signal is located. Frames contain both pilots and data (similar to system messages in SSB for NR).

Optionally, after the frame timing is found based on the synchronization signal sequence, channel estimation may be further performed to obtain the CSI. Then, according to the obtained CSI, demodulate the data part to obtain system information.

Optionally, the receiving side can first detect the frame timing by using the pilot frequency (synchronization signal sequence), and then further use the pilot frequency to perform channel estimation in the delayed Doppler domain to demodulate the data part. Therefore, a guard band needs to be reserved between the pilot and the data, and the data is distributed in C delay taps and D Doppler taps. Among them, the size of C and D mainly depends on the size of the data samples to be sent; for example, if the number of information bits to be transmitted is N, the selected code rate is a, and the selected modulation order is M-QAM, then it is necessary to transmit The number of samples is K=N/a/log_2(M). Then the K QAM symbols can be mapped on the delayed Doppler domain, K=C×D.

Optionally, the delay tap may refer to a delay tap, that is, the delay dimension coordinate of the delay Doppler resource grid.

Optionally, the delay tap may refer to the delay dimension coordinates of some or all of the delayed Doppler resource grids under a Doppler dimension coordinate.

Optionally, the pilot frame may carry multiple functions: obtain timing synchronization; obtain accurate CSI; and serve user data demodulation in subsequent time slots (using QCL relationship); be used for pilot resources in subsequent time slots Self-adaptive; after synchronizing the timing, the resource grid in the delayed Doppler domain is recovered, and the pilot frequency is used for channel estimation to demodulate the data in the frame.

Based on the channel quality related information, it is determined that the synchronization signal sequence is mapped to the resource grid pattern of the delay Doppler domain.

Optionally, in the case that the first communication device acquires the channel quality related information, it may be determined based on the channel quality related information that the synchronization signal sequence is mapped to a resource grid pattern in the delay Doppler domain.

Optionally, since the ISFFT operation in the OTFS baseband processing is equivalent to a two-dimensional spread spectrum operation performed on the signal by using the DFT operator, the number of samples carrying information is increased, thus increasing the complexity of detection at the receiving end. Therefore, according to the characteristics of OTFS baseband signal processing, by designing a special pattern pattern for signal mapping in the delayed Doppler domain, the effect of reducing the complexity of receiver sequencing sequence detection can be achieved, which is more conducive to the popularization and application of this technology.

Optionally, a pilot sequence X may be defined on an M×N delayed Doppler plane for synchronization detection. Then the time-domain sampling point distribution containing the X sequence information has a corresponding relationship with the mapping of X on the delayed Doppler domain.

FIG. 10 is a schematic diagram of transforming a delayed Doppler domain sequence into a time domain sampling point provided by an embodiment of the present application. As shown in FIG. 10 , it is a transformation of transforming a delayed Doppler domain sequence into a time domain sampling point in two mapping modes. process.

Optionally, the first mapping method: the baseband processing process is to perform IFFT on the delayed Doppler domain data set row by row. Therefore, the pilot frequency X can be mapped row by row to the delayed Doppler domain plane with a size of M×N, that is, If it is only mapped to the row corresponding to a certain delay tap, after the transformation to the delay-time domain, there is only information of the pilot X on a certain delay tap, which is denoted as X _dt , and the length of X _dt is N. On the time-domain sampling points obtained after vectorization, X _dt is evenly distributed on the transmission sampling points of MN×1 according to a certain interval, as shown in the left side of Fig. 10 .

Optionally, the second mapping method: when the pilot frequency X is mapped on the delay Doppler plane by column, that is, only mapped to the column corresponding to a certain Doppler tap, after row-by-row IFFT, its information is extended to the delay- On all samples of multiple delay taps in the time domain, these samples are denoted as X _dt . In the extreme case shown on the right side of Figure 10, the information of X is extended to all samples in M delay taps, that is, X _dt is distributed on all time-domain sample points obtained after vectorization, and the length of X _dt at this time for MN.

Optionally, when mapping mode 1 is adopted, when the receiving side detects the number of received sample points, it only needs to extract a small number of sample points at appropriate positions for detection; and when mapping mode 2 is adopted, the receiving side needs to compare the number of samples. Multiple sample points for detection.

Optionally, if the mapping of the pilot frequency X in the delay Doppler domain only exists on Q delay taps, the number of samples to be detected by the receiving side is QN. And the sampling interval of the sampling points on the receiving side is M-Q.

Optionally, assuming that the origin of the coordinates of the delay Doppler domain is the vertex of the upper left corner of the resource grid of the delay Doppler domain, the pilot frequency X can be mapped from the Pth delay tap, then X _dt is in the MN× of the current time slot. The starting position that occurs in 1 time domain sampling point is P.

Optionally, when the pilot mapping mode is known, the receiver side can obtain a priori information on the position of X _dt at the receiving time domain sampling point, that is, the coordinate position of X _dt in all time domain sampling points in the current time slot is: :

[P,P+(M-Q+1),…,P+(N-1)(M-Q+1)];

In addition, considering the overhead of pilot design, the overhead includes the overhead of the pilot sequence itself and the overhead of the guard band of the pilot sequence.

FIG. 11 is a schematic diagram of pilot overhead provided by the implementation of the present application. As shown in FIG. 11 , pilots can be mapped on a resource grid in the delayed Doppler domain in a rectangular pattern, and the resource grid only contains pilots and no data.

Optionally, if the total length of the pilot is L and exists on Q delay taps, it is easy to know that the pilot exists in the

on a Doppler tap. Assuming that the width of the pilot guard band in the delay dimension is A, and the width in the Doppler dimension is B, the total overhead of the pilot is:

Therefore, minimizing the pilot overhead is equivalent to solving the following minimization problem:

Therefore, the current optimal pilot mapping method can be determined, namely:

where Q is the side length of the mapped resource block;

Optionally, since the number of samples to be detected by the receiver side is QN,

Rounding down so that X _dt occupies as few delay taps as possible can reduce receiver-side detection complexity.

Optionally, when the first communication device such as the base station has prior information of the channel, that is, (τ _max , v _max ), (A, B) may be determined first according to this, so as to calculate a better Q, and determine the derivative. The mapping mode of the frequency signal.

For example, when the first communication device is a base station, when the base station has a priori information of the channel, namely (τ _max , v _max ), (A, B) can be determined first according to this, so as to calculate a better Q, Determine the mapping mode of the pilot signal.

Optionally, the pilot frame only contains pilots and is only used to find synchronization timing, that is, the receiver side does not need to use the pilots to perform (delayed Doppler domain) channel estimation. Therefore, there is no need to reserve a guard band. The design criteria of the pilot mapping scheme are:

Optionally, the pilot frame for synchronization contains both pilot (synchronization signal sequence) and data (similar to the system message in SSB of NR). The receiving side can use the pilot to detect the frame timing, and then further use the pilot to perform channel estimation in the delayed Doppler domain to demodulate the data part. Therefore, a guard band needs to be reserved between the pilot and the data, and the data is distributed in C delay taps and D Doppler taps. Accordingly, minimizing the pilot overhead is equivalent to solving the following minimization problem,

in,

Optionally, the determining, based on the channel quality-related information, that the synchronization signal sequence is mapped to a resource grid pattern in a delayed Doppler domain, includes:

Determine the resource grid pattern in which the synchronization signal sequence is mapped to the delay Doppler domain based on a recently acquired channel quality-related information; or

Determine, based on the largest channel quality-related information among the acquired at least two channel-quality-related information, the synchronization signal sequence is mapped to a resource grid pattern in the delay Doppler domain; or

Based on the obtained average value of at least two channel quality related information, a resource grid pattern in which the synchronization signal sequence is mapped to the delay Doppler domain is determined.

Optionally, when determining, based on the channel quality related information, that the synchronization signal sequence is mapped to the resource grid pattern in the delayed Doppler domain, the first communication device may determine the The synchronization signal sequence is mapped to a resource grid pattern in the delayed Doppler domain.

For example, the value of (τ _max , v _max ) measured by the k th synchronization pilot can be used to determine the size of the pilot guard band used for the k th to k+1 th pilot frames, that is, to calculate Q.

Optionally, when determining, based on the channel quality-related information, that the synchronization signal sequence is mapped to the resource grid pattern in the delayed Doppler domain, the first communication device may, based on the obtained at least two channel quality-related information, the largest one. Channel quality-related information, to determine the resource grid pattern in which the synchronization signal sequence is mapped to the delayed Doppler domain;

For example, a maximum value may be taken from several groups (τ _max , v _max ) of consecutive multiple synchronization pilot measurements, and then based on the maximum value, the synchronization signal sequence may be mapped to a resource grid pattern in the delay Doppler domain, That is to calculate Q.

Optionally, when determining, based on the channel quality-related information, that the synchronization signal sequence is mapped to the resource grid pattern in the delayed Doppler domain, the first communication device may, based on the acquired average value of at least two channel quality-related information , and determine the resource grid pattern in which the synchronization signal sequence is mapped to the delay Doppler domain.

For example, an average value may be taken in several groups (τ _max , v _max ) of consecutive multiple synchronization pilot measurements, and based on the average value, the resource grid pattern of the synchronization signal sequence mapped to the delay Doppler domain may be determined, that is, Calculate Q.

Optionally, in this embodiment of the present application, the signal quality-related information obtained after performing channel estimation based on pilots (such as synchronization signal sequences) one or more times can be used for pilot resource adaptation in subsequent time slots. , for example, as a priori knowledge for the first communication device to determine the pilot mapping mode; that is, using the maximum delay and the maximum Doppler information in the CSI information, namely (τ _max , v _max ), to determine the pilot frequency protection in the subsequent time slot belt pattern.

Optionally, the guard tape mode may include the size of the guard tape, and may also include the shape of the guard tape.

The synchronization signal sequence is mapped to the row corresponding to any delay tap on the resource grid of the delay Doppler domain.

Optionally, in the case that the first communication device does not acquire channel quality related information, the synchronization signal sequence is mapped to a row corresponding to any delay tap on the resource grid of the delay Doppler domain.

Optionally, when the base station does not have the prior information of the channel, it directly adopts the mapping mode 1 or the mapping mode 2 in FIG. 10 .

Optionally, from the perspective of reducing the detection complexity of the receiver, the first mapping method in FIG. 10 can be adopted, that is, the synchronization signal sequence is mapped to the row corresponding to any delay tap on the resource grid of the delay Doppler domain. superior.

Based on a PN sequence, a synchronization signal sequence associated with the physical layer identity is generated.

Optionally, the synchronization signal sequence can be generated based on the PN sequence;

Optionally, the synchronization signal sequence associated with the physical layer identifier may be generated based on a PN sequence, generated from a PN sequence, and associated with the physical layer identifier.

Optionally, the embodiments of the present application may be applied to the downlink, the first communication device is a network side device, the second communication device is a terminal, and the physical layer identifier may be a cell identifier Cell ID.

Optionally, the embodiments of the present application may be applied to sidelinks, where the first communication device is a terminal and the second communication device is a terminal, and the physical layer identifier may be a Sidelink ID or a UE ID.

Based on the at least two PN sequences, a synchronization signal sequence associated with the physical layer identity is generated.

Optionally, the synchronization signal sequence associated with the physical layer identification may be generated based on at least two PN sequences.

For example, the synchronization signal sequence can be generated from two or three PN sequences, and multiple PN sequences collectively indicate Cell ID or collectively indicate Sidelink ID or UE ID.

Optionally, the partial synchronization signal sequence generated by each of the at least two PN sequences is respectively associated with part of the physical layer identifiers in the physical layer identifiers.

Optionally, the corresponding part of the synchronization signal sequence generated by each of the at least two PN sequences may be associated with a part of the physical layer identifier.

Optionally, among the multiple PN sequences for generating the synchronization signal sequence, each PN sequence may be associated with a part of the physical layer identifier.

For example, among the multiple PN sequences for generating the synchronization signal sequence, each PN sequence may be associated with a part of the Cell ID.

For example, among the multiple PN sequences for generating the synchronization signal sequence, each PN sequence may be associated with a part of the Sidelink ID or UE ID.

Optionally, generating a synchronization signal sequence associated with the physical layer identifier based on at least two PN sequences, including:

The at least two PN sequences are interleaved, wherein the interleaving manner of the at least one PN sequence is associated with a physical layer identifier or a part of the physical layer identifier; or

The at least two PN sequences are placed end to end.

Optionally, when generating a synchronization signal sequence associated with a physical layer identifier based on at least two PN sequences, a plurality of PN sequences can be interleaved and placed to generate a synchronization signal sequence whose interleaving mode is the same as that of the physical layer identifier or part of the physical layer identifier. Identity associated.

Optionally, when generating the synchronization signal sequence associated with the physical layer identifier based on at least two PN sequences, multiple PN sequences may be interleaved or connected in sequence according to a fixed rule to generate the synchronization signal sequence.

Optionally, when generating a synchronization signal sequence associated with a physical layer identifier based on at least two PN sequences, the at least two PN sequences may be placed end to end to generate a synchronization signal sequence.

Optionally, the partial synchronization signal generated by each of the at least two PN sequences is associated with a physical layer identifier.

Optionally, when generating the synchronization signal sequence associated with the physical layer identifier based on the at least two PN sequences, each of the at least two PN sequences is associated with all the physical layer identifiers.

Optionally, the LFSRs used to generate the synchronization signal sequence may be the same or different.

Starting from a preset row of resource grids, the at least two PN sequences are sequentially mapped on at least two rows of resource grids after the row of resource grids, and each row of resource grids in the at least two rows of resource grids maps the One PN sequence in at least two PN sequences, wherein the position of the preset resource grid of one row is associated with that of the communication peer.

Optionally, when generating a synchronization signal sequence associated with a physical layer identifier based on at least two PN sequences, each PN sequence in the at least two PN sequences is associated with all physical layer identifiers, wherein multiple PN sequences are It can be interleaved, and its interleaving mode is associated with the physical layer identifier.

Optionally, optionally, when generating a synchronization signal sequence associated with a physical layer identifier based on at least two PN sequences, each PN sequence in the at least two PN sequences is associated with all physical layer identifiers, wherein, Starting from a preset row of resource grids, at least two PN sequences are sequentially mapped on at least two rows of resource grids after the row of resource grids, and at least two rows of resource grids are sequentially mapped to the at least two PN sequences, wherein the said The position of a preset row of resource grids is associated with the communication peer. For example, starting from delay tap k, two or three PN sequences are mapped to delay tap(k, k+1) or (k, k respectively) +1, k+2) on. where k is associated with the physical layer identity.

Optionally, the synchronization signal is divided into a first part and a second part;

The first part is used for synchronizing timing as a synchronizing signal;

The second part is used to indicate the physical layer identifier.

Optionally, in the synchronization signal sequence generated by one or more PN sequences, only a part can be used for blind timing detection; the other part is used to detect information bits after the synchronization timing is found, such as to indicate the physical layer identifier. .

FIG. 12 is a second schematic flowchart of a synchronization signal transmission method provided by an embodiment of the present application. As shown in FIG. 12 , the method includes the following steps:

Step 1200, the second communication device receives the time domain sampling points of the synchronization signal sequence;

Step 1210: Perform synchronization timing detection on the time domain sampling points of the synchronization signal sequence.

Optionally, the embodiments of the present application may be applied to the downlink, the first communication device may be a network side device, such as a base station, and the second communication device may be a terminal UE.

Optionally, the embodiment of the present application may be applied to a side link, the first communication device may be a terminal UE, and the second communication device may be a terminal UE.

Optionally, the first communication device may use a sequence-based synchronization signal sequence for OTFS modulation, and send it to the second communication device in the delayed Doppler domain, and the second communication device receives the synchronization signal sequence in the delayed Doppler domain after receiving the synchronization signal sequence. , the synchronization timing detection can be performed on the time domain sampling points of the synchronization signal sequence.

Optionally, the synchronization signal sequence is generated based on a sequence with good autocorrelation and cross-correlation performance. After the first communication device modulates the synchronization signal sequence, it can be mapped to a delay Doppler domain resource grid for transmission.

Optionally, after the synchronization signal sequence is changed to the transmitted time domain sampling point by the baseband processing of the OTFS system, good autocorrelation and cross-correlation performance can still be maintained. Therefore, the second communication device, that is, the receiving end, can directly detect the synchronization signal based on the received time domain sampling points, and obtain the synchronization timing without additional processing steps.

Optionally, the performing synchronization timing detection on the time domain sampling points of the synchronization signal sequence includes:

In the case that the second communication device has pilot mapping related information, sampling the synchronization signal sequence based on the pilot mapping related information to obtain the time domain sampling point;

Synchronous timing detection is performed on the time domain sampling points.

Optionally, when the second communication device such as the UE has pilot mapping related information, it may extract time domain sampling points with a total length of QN at a specific location for detection.

Optionally, sampling points may be obtained by sampling the synchronization signal sequence based on pilot mapping related information.

Optionally, the pilot mapping related information may be pilot mapping prior information;

Optionally, the second communication device may have pilot mapping related information in the following cases:

1) The system may only support one kind of pilot frequency mapping information, or the pilot frequency used for synchronization may have a well-known default mapping mode.

2) The system can support several pilot mapping modes, and the second communication device can perform traversal search.

3) The second communication device may have a priori information of the pilot mapping configuration of the first communication device. For example, the second communication device may have been connected to the first communication device before, and was in an idle state later, and now needs to re-establish the connection synchronously, while retaining the last configuration information.

If the second communication device does not have pilot mapping related information, perform synchronization timing detection on all time domain sampling points of the synchronization signal sequence.

Optionally, when the second communication device such as the UE has pilot mapping related information, it may detect the time domain sampling points with a length of MN.

Optionally, synchronization timing detection may be performed on all time domain sampling points of the synchronization signal sequence based on pilot mapping related information.

Optionally, the second communication device may not have pilot mapping related information in the following cases: the second communication device is powered on and accesses the first communication device for the first time without any prior information.

Optionally, the method further includes:

When the synchronization signal sequence is used for synchronizing timing and for acquiring channel quality related information, the channel quality related information is determined based on the synchronization signal sequence.

Optionally, when the synchronization signal sequence is used for synchronizing timing and for acquiring channel quality related information, the channel quality related information may be determined based on the synchronization signal sequence.

Optionally, when the synchronization signal sequence is used to synchronize timing and to obtain channel quality-related information, and the pilot frame where the synchronization signal sequence is located also includes data, the channel quality-related information may be determined based on the synchronization signal sequence. .

Optionally, the method further includes:

In a case where the pilot frame where the synchronization signal sequence is located includes a data signal, the data signal is demodulated based on the channel quality related information.

Optionally, the pilot frame can carry multiple functions: acquiring timing synchronization; acquiring accurate CSI; and serving user data demodulation in subsequent time slots (using QCL relationship); used for pilot resources in subsequent time slots Self-adaptive; after synchronizing the timing, the resource grid in the delayed Doppler domain is recovered, and the pilot frequency is used for channel estimation to demodulate the data in the frame.

It should be noted that, for the synchronization signal transmission method provided by the embodiments of the present application, the execution body may be a synchronization signal transmission apparatus, or a control module in the synchronization signal transmission apparatus for executing the synchronization signal transmission method. In the embodiments of the present application, the method for transmitting a synchronization signal performed by a synchronization signal transmission device is used as an example to describe the synchronization signal transmission device provided in the embodiment of the present application.

FIG. 13 is one of the schematic structural diagrams of the synchronization signal transmission device provided by the embodiment of the present application. As shown in FIG. 13 , the device includes: a first generation module 1310 and a first transmission module 1320; wherein:

The first generation module 1310 is used for the first communication device to generate a synchronization signal sequence mapped in the delayed Doppler domain;

The first transmission module 1320 is used for the first communication device to transmit the time domain sampling points of the synchronization signal sequence.

Optionally, the synchronization signal transmission apparatus may generate a synchronization signal sequence mapped in the delayed Doppler domain through the first generating module 1310 ; and then may transmit the time domain sampling points of the synchronization signal sequence through the first transmission module 1320 .

Optionally, the first generation module is used for:

The at least two PN sequences are interleaved and placed, wherein the interleaving mode of the at least one PN sequence is associated with the physical layer identifier of the communication peer or part of the physical layer identifier; or

The at least two PN sequences are placed end to end.

Optionally, the partial synchronization signal generated by each of the at least two PN sequences is associated with the physical layer identifier.

Optionally, the first generation module is used for:

The at least two PN sequences are interleaved, wherein the interleaving manner of the at least one PN sequence is associated with the physical layer identifier or part of the physical layer identifier; or

The first part is used for synchronizing timing as a synchronizing signal;

The second part is used to indicate the physical layer identifier.

The synchronization signal transmission apparatus in this embodiment of the present application may be an electronic device, or may be a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than the terminal. Exemplarily, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, an in-vehicle electronic device, a Mobile Internet Device (MID), an augmented reality (AR)/virtual reality (VR) ) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook or personal digital assistant (PDA), etc., and can also be a server, network attached storage (Network Attached Storage, NAS), personal computer (personal computer, PC), television (television, TV), teller machine or self-service machine, etc., which are not specifically limited in the embodiments of the present application.

The synchronization signal transmission device in the embodiment of the present application may be a device with an operating system. The operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, which are not specifically limited in the embodiments of the present application.

The synchronization signal transmission apparatus provided in the embodiments of the present application can implement the various processes implemented by the method embodiments in FIG. 9 to FIG. 11 , and achieve the same technical effect. To avoid repetition, details are not described here.

FIG. 14 is a second schematic structural diagram of a synchronization signal transmission device provided by an embodiment of the present application. As shown in FIG. 14 , the device includes: a first receiving module 1410 and a first detection module 1420, wherein:

The first receiving module 1410 is used for the second communication device to receive the time domain sampling point of the synchronization signal sequence;

The first detection module 1420 is used for the second communication device to perform synchronization timing detection on the time domain sampling points of the synchronization signal sequence.

Optionally, the synchronization signal transmission apparatus may receive the time domain sampling points of the synchronization signal sequence through the first receiving module 1410; and then the first detection module 1420 may perform synchronization timing detection on the time domain sampling points of the synchronization signal sequence.

Optionally, the first detection module is used for:

Synchronous timing detection is performed on the time domain sampling points.

Optionally, the first detection module is used for:

Optionally, the device further includes:

The first determination is used for determining channel quality related information based on the synchronization signal sequence when the synchronization signal sequence is used for timing synchronization and for acquiring channel quality related information.

Optionally, the device further includes:

A first demodulation module, configured to demodulate the data signal based on the channel quality related information in the case that the pilot frame where the synchronization signal sequence is located includes a data signal.

The synchronization signal transmission device in this embodiment of the present application may be a device, or may be a component, an integrated circuit, or a chip in a terminal. The device may be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal may include, but is not limited to, the types of terminals 11 listed above, and the non-mobile terminal may be a server, a network attached storage (NAS), a personal computer (personal computer, PC), a television ( television, TV), teller machine, or self-service machine, etc., which are not specifically limited in the embodiments of the present application.

The synchronization signal transmission device provided in the embodiment of the present application can realize the various processes realized by the method embodiment of FIG. 12, and achieve the same technical effect. In order to avoid repetition, details are not repeated here.

Optionally, FIG. 15 is a schematic structural diagram of a communication device provided by an embodiment of the present application. As shown in FIG. 15 , a communication device 1500 includes a processor 1501 and a memory 1502 , which are stored in the memory 1502 and can be stored in the processor 1501 For example, when the communication device 1500 is a terminal, when the program or instruction is executed by the processor 1501, each process of the above method embodiments can be implemented, and the same technical effect can be achieved. When the communication device 1500 is a network side device, when the program or instruction is executed by the processor 1501, each process of the above method embodiments can be implemented, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

Optionally, the second communication device may be a terminal, and the first communication device may be a network side device;

Optionally, the first communication device may be a terminal, and the second communication device may be a terminal.

FIG. 16 is a schematic diagram of a hardware structure of a terminal provided by an embodiment of the present application.

The terminal 1600 includes but is not limited to: a radio frequency unit 1601, a network module 1602, an audio output unit 1603, an input unit 1604, a sensor 1605, a display unit 1606, a user input unit 1607, an interface unit 1608, a memory 1609, and a processor 1610, etc. at least part of the components.

Those skilled in the art can understand that the terminal 1600 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 1610 through a power management system, so as to manage charging, discharging, and power consumption through the power management system management and other functions. The terminal structure shown in FIG. 16 does not constitute a limitation on the terminal, and the terminal may include more or less components than shown, or combine some components, or arrange different components, which will not be repeated here.

It should be understood that, in this embodiment of the present application, the input unit 1604 may include a graphics processor (Graphics Processing Unit, GPU) 16041 and a microphone 16042. Such as camera) to obtain still pictures or video image data for processing. The display unit 1606 may include a display panel 16061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1607 includes a touch panel 16071 and other input devices 16072 . Touch panel 16071, also called touch screen. The touch panel 16071 may include two parts, a touch detection device and a touch controller. Other input devices 16072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which are not described herein again.

In the embodiment of the present application, the radio frequency unit 1601 receives the information from the communication peer end, and then processes it to the processor 1610; in addition, sends the information to be transmitted to the communication peer end. Generally, the radio frequency unit 1601 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 1609 may be used to store software programs as well as various data. The memory 1609 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, image playback function, etc.), etc. Further, memory 1609 may include volatile memory or non-volatile memory, or memory 1609 may include both volatile and non-volatile memory. Wherein, the non-volatile memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM, PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), an electrically programmable read-only memory (Erasable PROM, EPROM). Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous random access memory) DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synch link DRAM) , SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DRRAM). The memory 109 in this embodiment of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 1610 may include one or more processing units; optionally, the processor 1610 integrates an application processor and a modem processor, wherein the application processor mainly processes operations involving an operating system, a user interface, and an application program, etc. Modem processors mainly deal with wireless communications, such as baseband processors. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 1610.

Among them, the processor 1610 is used for:

Generate a sequence of synchronization signals mapped in the delayed Doppler domain;

The time domain sampling points of the synchronization signal sequence are transmitted.

Optionally, processor 1610 is used to:

The transmitting the synchronization signal sequence in the delayed Doppler domain includes:

Optionally, processor 1610 is used to:

The at least two PN sequences are placed end to end.

Optionally, processor 1610 is used to:

The first part is used for synchronizing timing as a synchronizing signal;

The second part is used to indicate the physical layer identifier.

or,

Optionally, processor 1610 is used to:

Receive the time domain sampling point of the synchronization signal sequence;

The synchronization timing is detected on the time domain sampling points of the synchronization signal sequence.

The embodiment of the present application uses the synchronization signal sequence as the synchronization signal to transmit in the delayed Doppler domain, maintains good autocorrelation and cross-correlation performance of the synchronization signal, simplifies the synchronization detection step on the receiving side, and is suitable for simplified OTFS engineering implementation. The additional complexity of inserting synchronization signals in the time-frequency domain is avoided.

Optionally, processor 1610 is used to:

Synchronous timing detection is performed on the time domain sampling points.

Optionally, processor 1610 is used to:

In a case where the pilot frame where the synchronization signal sequence is located includes a data signal, the data signal is demodulated based on the channel quality related information. The embodiment of the present application uses the synchronization signal sequence as the synchronization signal for transmission in the delayed Doppler domain, maintains good autocorrelation and cross-correlation performance of the synchronization signal, simplifies the synchronization detection step on the receiving side, and is suitable for simplified OTFS engineering implementation. The additional complexity of inserting synchronization signals in the time-frequency domain is avoided.

The terminal embodiments in the embodiments of the present application are product embodiments corresponding to the foregoing method embodiments, and all implementation manners in the foregoing method embodiments are applicable to the terminal embodiments, and the same or similar technical effects can also be achieved. This will not be repeated here.

As shown in FIG. 17 , the network side device 1700 includes: an antenna 1701 , a radio frequency device 1702 , and a baseband device 1703 . The antenna 1701 is connected to the radio frequency device 1702 . In the uplink direction, the radio frequency device 1702 receives information through the antenna 1701, and sends the received information to the baseband device 1703 for processing. In the downlink direction, the baseband device 1703 processes the information to be sent and sends it to the radio frequency device 1702 , and the radio frequency device 1702 processes the received information and sends it out through the antenna 1701 .

The above-mentioned frequency band processing apparatus may be located in the baseband apparatus 1703 , and the method performed by the network side device in the above embodiments may be implemented in the baseband apparatus 1703 . The baseband apparatus 1703 includes a processor 1704 and a memory 1705 .

The baseband device 1703 may include, for example, at least one baseband board on which multiple chips are arranged, as shown in FIG. 17 , one of the chips is, for example, the processor 1704 , which is connected to the memory 1705 to call the program in the memory 1705 to execute The network devices shown in the above method embodiments operate.

The baseband device 1703 may further include a network interface 1706 for exchanging information with the radio frequency device 1702, and the interface is, for example, a common public radio interface (CPRI for short).

Specifically, the network-side device in this embodiment of the present application further includes: instructions or programs that are stored in the memory 1705 and run on the processor 1704, and the processor 1704 invokes the instructions or programs in the memory 1705 to execute the modules shown in FIG. 13 . The implementation method and achieve the same technical effect, in order to avoid repetition, it is not repeated here.

Among them, the processor 1704 is used for:

Optionally, processor 1704 is used to:

The at least two PN sequences are placed end to end.

Optionally, processor 1704 is used to:

The first part is used for synchronizing timing as a synchronizing signal;

The second part is used to indicate the physical layer identifier.

The network-side device embodiments in the embodiments of the present application are product embodiments corresponding to the foregoing method embodiments, and all implementations in the foregoing method embodiments are applicable to the terminal embodiments, and can also achieve the same or similar technical effects. Therefore, it will not be repeated here.

The embodiments of the present application further provide a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, each process of the above-mentioned embodiment of the synchronization signal transmission method is implemented, and can achieve The same technical effect, in order to avoid repetition, will not be repeated here.

Wherein, the processor is the processor in the terminal described in the foregoing embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

An embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a network-side device program or instruction to realize the above synchronization signal transmission Each process of the method embodiment can achieve the same technical effect, and in order to avoid repetition, it will not be repeated here.

It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip, a system-on-chip, or a system-on-a-chip, or the like.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional elements in the process, method, article, or apparatus that includes the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in the reverse order depending on the functions involved. To perform, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to some examples may be combined in other examples.

From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence or in a part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) execute the methods described in the various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of this application, without departing from the scope of protection of the purpose of this application and the claims, many forms can be made, which all fall within the protection of this application.

Claims

A synchronization signal transmission method, comprising:

The first communication device generates a synchronization signal sequence mapped in the delayed Doppler domain;

The first communication device transmits the time domain sampling points of the synchronization signal sequence.
The synchronization signal transmission method according to claim 1, wherein the generating the synchronization signal sequence mapped in the delayed Doppler domain comprises:

A guard band is not reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain; or, a guard band is reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain.
The synchronization signal transmission method according to claim 2, wherein the generating the synchronization signal sequence mapped in the delayed Doppler domain comprises:

In the case where the synchronization signal sequence is only used for synchronization timing, no guard band is reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain.
The synchronization signal transmission method according to claim 2, wherein the generating the synchronization signal sequence mapped in the delayed Doppler domain comprises:

When the synchronization signal sequence is used for synchronization timing and for acquiring channel quality related information, a guard band is reserved for the synchronization signal sequence on the resource grid of the delay Doppler domain.
The synchronization signal transmission method according to claim 2, wherein the generating the synchronization signal sequence mapped in the delayed Doppler domain comprises:

When the synchronization signal sequence is used for synchronization timing and for obtaining channel quality related information, and the pilot frame where the synchronization signal sequence is located includes a data signal, the resource elements and A guard band is reserved between resource elements to which the data signal is mapped.
The synchronization signal transmission method according to any one of claims 1-5, wherein the generating a synchronization signal sequence mapped in the delayed Doppler domain comprises:

Based on the channel quality related information, it is determined that the synchronization signal sequence is mapped to the resource grid pattern of the delay Doppler domain.
The synchronization signal transmission method according to claim 6, wherein the determining that the synchronization signal sequence is mapped to the resource grid pattern of the delayed Doppler domain based on the channel quality related information, comprises:

Determine the resource grid pattern in which the synchronization signal sequence is mapped to the delay Doppler domain based on a recently acquired channel quality-related information; or

Determine, based on the largest channel quality-related information among the acquired at least two channel-quality-related information, the synchronization signal sequence is mapped to a resource grid pattern in the delay Doppler domain; or

Based on the obtained average value of at least two channel quality related information, a resource grid pattern in which the synchronization signal sequence is mapped to the delay Doppler domain is determined.
The synchronization signal transmission method according to any one of claims 1-5, wherein the generating a synchronization signal sequence mapped in the delayed Doppler domain comprises:

The synchronization signal sequence is mapped to the row corresponding to the delay dimension coordinate delay tap of any delay Doppler resource grid on the resource grid of the delay Doppler domain.
The synchronization signal transmission method according to any one of claims 1-5, wherein the generating a synchronization signal sequence mapped in the delayed Doppler domain comprises:

Based on a PN sequence, a synchronization signal sequence associated with the physical layer identity is generated.
The synchronization signal transmission method according to any one of claims 1-5, wherein the generating a synchronization signal sequence mapped in the delayed Doppler domain comprises:

Based on the at least two PN sequences, a synchronization signal sequence associated with the physical layer identity is generated.
The synchronization signal transmission method according to claim 10, wherein the partial synchronization signal sequence generated by each of the at least two PN sequences is respectively related to part of the physical layer identifiers in the physical layer identifiers link.
The synchronization signal transmission method according to claim 11, wherein the generating a synchronization signal sequence associated with a physical layer identifier based on at least two PN sequences comprises:

The at least two PN sequences are interleaved and placed, wherein the interleaving mode of the at least one PN sequence is associated with the physical layer identifier of the communication peer or part of the physical layer identifier; or

The at least two PN sequences are placed end to end.
The synchronization signal transmission method according to claim 10, wherein the partial synchronization signal generated by each of the at least two PN sequences is associated with the physical layer identifier.
The synchronization signal transmission method according to claim 13, wherein the generating a synchronization signal sequence associated with a physical layer identifier based on at least two PN sequences comprises:

The at least two PN sequences are interleaved, wherein the interleaving manner of the at least one PN sequence is associated with the physical layer identifier or part of the physical layer identifier; or

Starting from a preset row of resource grids, the at least two PN sequences are sequentially mapped on at least two rows of resource grids after the row of resource grids, and each row of resource grids in the at least two rows of resource grids maps the One PN sequence in at least two PN sequences, wherein the position of the preset resource grid of one row is associated with that of the communication peer.
The synchronization signal transmission method according to any one of claims 10 to 13, wherein the synchronization signal is divided into a first part and a second part;

The first part is used for synchronizing timing as a synchronizing signal;

The second part is used to indicate the physical layer identifier.
A synchronization signal transmission method, comprising:

The second communication device receives the time domain sampling points of the synchronization signal sequence;

The second communication device performs synchronization timing detection on the time domain sampling points of the synchronization signal sequence.
The synchronization signal transmission method according to claim 16, wherein the performing synchronization timing detection on the time domain sampling points of the synchronization signal sequence comprises:

In the case that the second communication device has pilot mapping related information, sampling the synchronization signal sequence based on the pilot mapping related information to obtain the time domain sampling point;

Synchronous timing detection is performed on the time domain sampling points.
The synchronization signal transmission method according to claim 16, wherein the performing synchronization timing detection on the time domain sampling points of the synchronization signal sequence comprises:

If the second communication device does not have pilot mapping related information, perform synchronization timing detection on all time domain sampling points of the synchronization signal sequence.
The synchronization signal transmission method according to any one of claims 16-18, wherein the method further comprises:

When the synchronization signal sequence is used for synchronizing timing and for acquiring channel quality related information, the channel quality related information is determined based on the synchronization signal sequence.
The synchronization signal transmission method according to claim 19, wherein the method further comprises:

In a case where the pilot frame where the synchronization signal sequence is located includes a data signal, the data signal is demodulated based on the channel quality related information.
A synchronization signal transmission device, comprising:

a first generation module, configured to generate a synchronization signal sequence mapped in the delayed Doppler domain;

The first transmission module is configured to transmit the time domain sampling points of the synchronization signal sequence.
The synchronization signal transmission device according to claim 21, wherein the first generation module is used for:

A guard band is not reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain; or, a guard band is reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain.
The synchronization signal transmission device according to claim 22, wherein the first generation module is used for:

In the case where the synchronization signal sequence is only used for synchronization timing, no guard band is reserved for the synchronization signal sequence on the resource grid of the delayed Doppler domain.
The synchronization signal transmission device according to claim 22, wherein the first generation module is used for:

When the synchronization signal sequence is used for synchronization timing and for acquiring channel quality related information, a guard band is reserved for the synchronization signal sequence on the resource grid of the delay Doppler domain.
The synchronization signal transmission device according to claim 22, wherein the first generation module is used for:

When the synchronization signal sequence is used for synchronization timing and for obtaining channel quality related information, and the pilot frame where the synchronization signal sequence is located includes a data signal, the resource elements and A guard band is reserved between resource elements to which the data signal is mapped.
The synchronization signal transmission device according to any one of claims 21-25, wherein the first generation module is used for:

Based on the channel quality related information, it is determined that the synchronization signal sequence is mapped to the resource grid pattern of the delay Doppler domain.
The synchronization signal transmission device according to claim 26, wherein the first generating module is used for:

Determine the resource grid pattern in which the synchronization signal sequence is mapped to the delay Doppler domain based on a recently acquired channel quality-related information; or

Determine, based on the largest channel quality-related information among the acquired at least two channel-quality-related information, the synchronization signal sequence is mapped to a resource grid pattern in the delay Doppler domain; or

Based on the obtained average value of at least two channel quality related information, a resource grid pattern in which the synchronization signal sequence is mapped to the delay Doppler domain is determined.
The synchronization signal transmission device according to any one of claims 21-25, wherein the first generation module is used for:

The synchronization signal sequence is mapped to the row corresponding to any delay tap on the resource grid of the delay Doppler domain.
The synchronization signal transmission device according to any one of claims 21-25, wherein the first generation module is used for:

Based on a PN sequence, a synchronization signal sequence associated with the physical layer identity is generated.
The synchronization signal transmission device according to any one of claims 21-25, wherein the first generation module is used for:

Based on the at least two PN sequences, a synchronization signal sequence associated with the physical layer identity is generated.
The synchronization signal transmission apparatus according to claim 30, wherein the partial synchronization signal sequence generated by each of the at least two PN sequences is respectively related to part of the physical layer identifiers in the physical layer identifiers link.
The synchronization signal transmission device according to claim 31, wherein the first generation module is used for:

The at least two PN sequences are interleaved and placed, wherein the interleaving mode of the at least one PN sequence is associated with the physical layer identifier of the communication peer or part of the physical layer identifier; or

The at least two PN sequences are placed end to end.
The synchronization signal transmission apparatus according to claim 30, wherein the partial synchronization signal generated by each of the at least two PN sequences is associated with the physical layer identifier.
The synchronization signal transmission device according to claim 33, wherein the first generation module is used for:

The at least two PN sequences are interleaved, wherein the interleaving manner of the at least one PN sequence is associated with the physical layer identifier or part of the physical layer identifier; or

Starting from a preset row of resource grids, the at least two PN sequences are sequentially mapped on at least two rows of resource grids after the row of resource grids, and each row of resource grids in the at least two rows of resource grids maps the One PN sequence in at least two PN sequences, wherein the position of the preset resource grid of one row is associated with that of the communication peer.
The synchronization signal transmission device according to any one of claims 30 to 33, wherein the synchronization signal is divided into a first part and a second part;

The first part is used for synchronizing timing as a synchronizing signal;

The second part is used to indicate the physical layer identifier.
A synchronization signal transmission device, comprising:

a first receiving module, configured to receive the time domain sampling points of the synchronization signal sequence;

The first detection module is configured to perform synchronization timing detection on the time domain sampling points of the synchronization signal sequence.
The synchronization signal transmission device according to claim 36, wherein the first detection module is used for:

In the case that the second communication device has pilot mapping related information, sampling the synchronization signal sequence based on the pilot mapping related information to obtain the time domain sampling point;

Synchronous timing detection is performed on the time domain sampling points.
The synchronization signal transmission device according to claim 36, wherein the first detection module is used for:

If the second communication device does not have pilot mapping related information, perform synchronization timing detection on all time domain sampling points of the synchronization signal sequence.
The synchronization signal transmission device according to any one of claims 36-38, wherein the device further comprises:

A first determining module, configured to determine channel quality related information based on the synchronization signal sequence when the synchronization signal sequence is used for timing synchronization and for acquiring channel quality related information.
The synchronization signal transmission apparatus according to claim 39, wherein the apparatus further comprises:

A first demodulation module, configured to demodulate the data signal based on the channel quality related information in the case that the pilot frame where the synchronization signal sequence is located includes a data signal.
A communication device, comprising a processor, a memory, and a program or instruction stored on the memory and executable on the processor, the program or instruction being executed by the processor to achieve as claimed in claim 1 Steps of the synchronization signal transmission method described in any one of to 15.
A communication device, comprising a processor, a memory, and a program or instruction stored on the memory and executable on the processor, the program or instruction being executed by the processor to achieve as claimed in claim 16 Steps of the synchronization signal transmission method described in any one of to 20.
A readable storage medium, wherein a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by the processor, the synchronization signal transmission method according to any one of claims 1 to 15 is realized , or the steps of implementing the synchronization signal transmission method according to any one of claims 16 to 20.