Access method, device, communication device and readable storage medium

Abstract

The present application discloses an access method, an apparatus, a communication device, and a readable storage medium, the method including: a terminal acquiring a first delay Doppler domain data set obtained by mapping N pilot signals to resource positions of a first delay Doppler domain resource block; and the terminal accessing P first network side devices according to a detection result of the first delay Doppler domain data set, the P first network side devices being any one of P first network side devices corresponding to P first resource positions, which are the P resource positions where a peak is detected in the first delay Doppler domain resource block, and P first network side devices corresponding to P first pilot signals, which are the P pilot signals where a peak is detected.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to China Patent Application No. 202110184964.6, filed in China on February 10, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of communications, and in particular to access methods, apparatus, communication devices and readable storage media. [Background technology]

[0003] In the initial access procedure in a single base station cell of New Radio (NR), the terminal obtains system information (SI) using the synchronization signal (including the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS)) in the detected Synchronization Signal Block (SSB), the reference signal (e.g., the Demodulation Reference Signal (DMRS)) in the Physical Broadcast Channel (PBCH), and data information (e.g., the Master Information Block (MIB)), and then performs random access using the information necessary for system access contained in the SI. In the above procedure, the synchronization signal, the reference signal, and the data information are closely related to each other.

[0004] However, in a cell-free network, since a terminal can receive signals from multiple transmitting receiving points (TRPs), the terminal must first determine which TRP to access, and then perform subsequent SI acquisition and random access. If the TRP selection at the time of initial access is performed using a synchronization signal, the overhead of TRP selection is likely to be large because the synchronization signal, reference signal, and data information are closely related, and the overhead of initial access is also large. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present application provide an access method, an apparatus, a communication device, and a readable storage medium that can solve the problem of large initial access overhead due to the close contact of a synchronization signal, a reference signal, and data information. [Means for solving the problem]

[0006] In a first aspect, the embodiments of the present application comprise: A terminal obtains a first delay Doppler domain data set obtained by mapping N pilot signals to resource locations of a first delay Doppler domain resource block, where N is an integer greater than 1; The terminal accesses P first network side devices according to the detection result of the first delay Doppler domain data set, where P is an integer equal to or smaller than N; The P first network side devices P first network side devices corresponding to the P first resource positions, which are the P resource positions at which a peak is detected in the first delayed Doppler domain resource block; The peak is detected in the P pilot signals, and the P first network side devices correspond to the P first pilot signals.

[0007] In a second aspect, the embodiments of the present application comprise: A first network side device maps a pilot signal to a resource location of a first delay Doppler domain resource block to obtain a second delay Doppler domain data set; and transmitting, by the first network side equipment, to a terminal, the time domain sampling points determined based on the second delay Doppler domain data set.

[0008] In a third aspect, the embodiments of the present application comprise: an acquisition module used by a terminal to acquire a first delay Doppler domain data set obtained by mapping N pilot signals to resource locations of a first delay Doppler domain resource block, where N is an integer greater than 1; The terminal includes an access module used to access P first network side devices according to the detection result of the first delay Doppler domain data set, where P is an integer equal to or less than N; The P first network side devices P first network side devices corresponding to the P first resource positions, which are the P resource positions at which a peak is detected in the first delayed Doppler domain resource block; The access device is provided as any one of P first network side devices corresponding to P first pilot signals, which are the P pilot signals in which peaks are detected.

[0009] In a fourth aspect, the embodiments of the present application include A mapping module is used by a first network side device to map pilot signals to resource locations of a first delay Doppler domain resource block to obtain a second delay Doppler domain data set; The first network side equipment includes a transmitting module for transmitting the time domain sampling points determined based on the second delay Doppler domain data set to a terminal.

[0010] In a fifth aspect, an embodiment of the present application provides a terminal comprising a processor, a memory and programs or commands stored in the memory and executable by the processor, the programs or commands, when executed by the processor, implementing steps of the method according to the first aspect.

[0011] In a sixth aspect, an embodiment of the present application provides a network side device comprising a processor, a memory, and a program or command stored in the memory and executable by the processor, the program or command realizing the steps of the method according to the second aspect when executed by the processor.

[0012] In a seventh aspect, an embodiment of the present application provides a readable storage medium storing a program or commands which, when executed by a processor, perform the steps of the method according to the first aspect or perform the steps of the method according to the second aspect.

[0013] In an eighth aspect, an embodiment of the present application provides a chip comprising a processor and a communication interface, the communication interface and the processor being coupled together, the processor executing a program or command of a network side device to realise the method described in the first aspect or to realise the method described in the second aspect.

[0014] In a ninth aspect, there is provided a computer program product stored on a non-volatile storage medium and executed by at least one processor to effectuate the method according to the first aspect, or to effectuate the method according to the second aspect.

[0015] In a tenth aspect, there is provided a communications device arranged to perform a method according to the first aspect or to perform a method according to the second aspect. Effect of the Invention

[0016] In an embodiment of the present application, the terminal can select access based on a pilot signal transmitted independently from the first network side device, thereby realizing separation of synchronization signals and system information in SSB and reducing resource overhead for initial access; and by processing and transmitting the pilot signal selected by the first network side device using OTFS technology, the reliability of the selection of the first network side device can be improved. [Brief description of the drawings]

[0017] [Figure 1] 1 is a block diagram of a wireless communication system to which an embodiment of the present application can be applied. [Diagram 2] FIG. 2 is a schematic diagram of the conversion between the delayed Doppler domain and the time-frequency domain provided in the embodiments of the present application. [Diagram 3] FIG. 2 is a schematic diagram of channel response relationships in different planes provided in an embodiment of the present application; [Figure 4] FIG. 2 is a schematic diagram of the transmitting and receiving side processing of the OTFS multi-carrier system provided in the embodiment of the present application. [Diagram 5] FIG. 2 is a schematic diagram of pilot mapping in delay Doppler domain provided in an embodiment of the present application; [Figure 6] FIG. 2 is a schematic diagram of pilot position detection provided in an embodiment of the present application; [Figure 7] FIG. 2 is a schematic diagram of pilot resource multiplexing in delay Doppler domain provided in an embodiment of the present application; [Figure 8] FIG. 2 is a schematic diagram of pilot sequence detection provided in an embodiment of the present application; [Figure 9] FIG. 2 is a schematic diagram illustrating a performance comparison under different pilot overhead conditions of two pilot design schemes provided in an embodiment of the present application; [Figure 10]FIG. 1 is a schematic diagram of a cell-free network configuration provided in an embodiment of the present application. [Figure 11] FIG. 1 is a schematic diagram of a supercell configuration provided in an example of the present application. [Figure 12] 1 is a flowchart of an access method provided in an embodiment of the present application. [Figure 13] FIG. 2 is a schematic diagram of distinguishing TRPs according to different pilot sequence mapping positions provided in an embodiment of the present application. [Figure 14] FIG. 2 is a schematic diagram of distinguishing TRPs by different pilot sequences provided in the examples of the present application. [Figure 15] FIG. 2 is a schematic diagram of distinguishing TRPs according to different pilot pulse mapping positions provided in an embodiment of the present application. [Figure 16] 4 is a flowchart of an access method provided in another embodiment of the present application. [Figure 17] FIG. 2 is a configuration diagram of an access device provided in one embodiment of the present application. [Figure 18] FIG. 2 is a block diagram of an access device provided in another embodiment of the present application. [Figure 19] FIG. 2 is a configuration diagram of a communication device provided in an embodiment of the present application. [Figure 20] FIG. 2 is a configuration diagram of a terminal provided in an embodiment of the present application. [Figure 21] FIG. 2 is a configuration diagram of a network side device provided in an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application, and it is to be understood that the described embodiments are not all the embodiments but only some of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present application.

[0019] The terms "first", "second", etc. in the specification and claims of this application are not intended to describe a particular order or sequence, but are intended to distinguish between similar objects. It should be understood that the data used in this manner may be substituted for one another where appropriate, so that the embodiments of this application may be performed in an order other than that shown or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object may be one or more. In the specification and claims, "and / or" indicates at least one of the objects connected, and the symbol " / " generally indicates that the related objects before and after are in an "or" relationship.

[0020] It should be noted that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, and can be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), 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 can generally be used interchangeably, and the technology described can be used in the above-mentioned systems and wireless technologies, or in other systems and wireless technologies. However, in the following description, a New Radio (NR) system is described for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can be applied to systems other than NR systems, for example, 6th generation (6G) systems. th It can also be applied to 6G (Generation, 6G) communication systems.

[0021] FIG. 1 shows a block diagram of a wireless communication system applicable to the embodiment of the present application. The wireless communication system includes a terminal 11 and a network side device 12. Here, the terminal 11 may be called a terminal device or a user terminal (User Equipment, UE), and may be a terminal side device such as a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a personal digital assistant, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (Mobile Internet Device, MID), a wearable device (Wearable Device), a vehicle user equipment (VUE), a pedestrian user equipment (PUE), etc., and the wearable device includes a bracelet, an earphone, glasses, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side equipment 12 may be a cell, a super cell base station or a core network, in which the base station may be called an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmission reception point (TRP) or any other suitable term in the above field, and the base station is not limited to a specific technical term as long as the same technical effect can be achieved.

[0022] For ease of understanding, some contents related to the embodiments of the present application will be described below.

[0023] 1. Orthogonal Time Frequency (OTFS).

[0024] TIFF0007636568000001.tif191170

[0025] The OTFS modulation technique allows the information in a packet of size M×N, for example, a Quadrature Amplitude Modulation (QAM) symbol, to be logically mapped to one M×N lattice point on a two-dimensional delay-Doppler plane, i.e., a pulse in each lattice point modulates one QAM symbol in the packet. Furthermore, by designing a set of orthogonal two-dimensional basis functions, the data set on the M×N delay-Doppler domain plane is transformed to the N×M time-frequency domain plane, and such a transformation is mathematically called Inverse Symplectic Fourier Transform (ISFFT). Meanwhile, the transformation from the time-frequency domain to the delay-Doppler domain is called Symplectic Fourier Transform (SFFT). The physical meaning behind it is that the delay and Doppler effect of a signal is actually the linear superposition effect of a series of echoes with different time and frequency shifts after the signal passes through a multipath channel. In this sense, the delay Doppler analysis and the time-frequency domain analysis can be obtained by mutual conversion between the ISSFT and SSFT described above, and the conversion relationship can be seen in FIG.

[0026] Therefore, the OTFS technique converts the time-varying multipath channel into a time-invariant (within a given time duration) two-dimensional delay Doppler domain channel, thus directly representing the channel delay Doppler response characteristics due to the geometric characteristics of the relative positions of reflectors between the transmitter and receiver in the wireless link. In this way, OTFS has the advantage of eliminating the difficulty of tracking time-varying fading characteristics in traditional time-frequency domain analysis, and extracting all diversity characteristics of the time-frequency domain channel through delay Doppler domain analysis. In a real system, the number of delay paths and Doppler shifts of the channel is much smaller than the number of the time-domain and frequency-domain responses of the channel, so the channel impulse response matrix represented in the delay Doppler domain has sparsity. Using the OTFS technique to analyze the sparse channel matrix in the delay Doppler domain can make the packaging of the reference signal tighter and more flexible, which is especially advantageous for supporting large antenna arrays in massive MIMO systems.

[0027] The essence of OTFS modulation is to define that the QAM symbols on the delay-Doppler plane are transformed into the time-frequency domain for transmission, and then the receiver processes them back in the delay-Doppler domain. Therefore, the method of analyzing the wireless channel response on the delay-Doppler domain can be introduced. When a signal passes through a linear time-varying wireless channel, the relationship between the representations of its channel response on different planes is shown in Figure 3.

[0028] In FIG. 3, the SFFT transformation formula is as follows:

[0029]

number

[0030] Correspondingly, the ISFFT transformation formula is:

[0031]

number

[0032] TIFF0007636568000004.tif26170

[0033]

number

[0034] From the relationship in Figure 3, the following equation was derived.

[0035]

number

[0036] Substituting (4) into (3), we obtain the following equation.

[0037]

number

[0038] From the relationship shown in FIG. 3, classical Fourier transform theory, and equation (5), we obtain the following equation:

[0039]

number

[0040] Here, v represents the delay variable, τ represents the Doppler variable, f represents the frequency variable, and t represents the time variable.

[0041] The analysis of the delay Doppler domain in the OTFS system can be realized by relying on the existing communication mechanism based on the time-frequency domain and adding another signal processing procedure to the transmitting and receiving sides, as suggested by equation (6). In addition, the said another signal processing is only a Fourier transform, and does not require the addition of a new module, but can be realized by using the existing hardware. Such good compatibility with the existing hardware system greatly facilitates the application of the OTFS system. In the actual system, the OTFS technology can be conveniently realized as a pre-processing and post-processing module of a single filter OFDM system, and has excellent compatibility with the multi-carrier system in the New Radio (NR) technology architecture.

[0042] When combining OTFS with a multi-carrier system, the realization method on the transmitting side is as follows: The QAM symbol containing the information to be transmitted is placed on the waveform of the delay Doppler plane, and then converted into the waveform of the time-frequency domain plane in the traditional multi-carrier system through two-dimensional ISFFT, and then undergoes one-dimensional inverse fast Fourier transform (IFFT) and serial-parallel conversion at the symbol level to form a time-domain sampling point for transmission. The receiving side of the OTFS system is almost the reverse of the transmitting side, that is, after the time-domain sampling point is received by the receiver, it undergoes parallel-serial conversion and one-dimensional fast Fourier transform (FFT) at the symbol level to first convert it into a waveform on the time-frequency domain plane, and then converts it into a waveform on the delay Doppler domain plane through SFFT, and then performs receiver processing including channel estimation, equalization, demodulation and decoding for the QAM symbol placed on the delay Doppler domain waveform. The transmitting and receiving side processing procedure of the OTFS system can be referred to in Figure 4. FIG. 4 shows a precoder, an Orthogonal Frequency Division Multiplex (OFDM) modulator, a channel, an OFDM demodulator, and a decoder.

[0043] The advantages of OTFS modulation are mainly expressed in the following aspects: 1) OTFS modulation transforms a time-varying fading channel in the time-frequency domain between transmitter and receiver into a deterministic, fade-free channel in the delay-Doppler domain, where each symbol in a set of information symbols transmitted at one time experiences the same static channel response and signal-to-noise ratio (SNR). 2) The OTFS system analyzes the reflectors in the physical channel by delay Doppler map, and uses the receive equalizer to perform interference merging of the energy from different reflected paths, which actually provides a fading-free static channel response. By utilizing the above static channel characteristics, the OTFS system does not need to introduce closed-loop channel self-adaptation to deal with fast time-varying channels like the OFDM system, thus improving 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 represented in a very compact form. The channel estimation overhead of the OTFS system is less and more accurate. 4) Yet another advantage of OTFS is its ability to deal with extreme Doppler channels: by analyzing the delay-Doppler map with appropriate signal processing parameters, the Doppler characteristics of the channel can be fully represented, which is advantageous for signal analysis and processing in Doppler-sensitive scenes (e.g., high-speed movement and millimeter waves).

[0044] To sum up, the channel estimation in the OTFS system adopts the following method: the transmitter maps the pilot pulse into the delay-Doppler domain, and the receiver estimates the channel response h(ν,τ) in the delay-Doppler domain through delay-Doppler map analysis for the pilot, and further obtains the channel response expression in the time-frequency domain according to the relationship in Figure 3, which is conducive to signal analysis and processing using the conventional technology in the time-frequency domain. The mapping of the pilot into the delay-Doppler plane may adopt the scheme in Figure 5.

[0045] TIFF0007636568000009.tif88170

[0046]

number

[0047] Here, τmax and ν max are the maximum delay and maximum Doppler shift of the entire channel, respectively. A number of guard symbols 502 surround the single-point pilot 501 to form a guard band, and the number of guard symbols 502 are correspondingly blank resource elements.

[0048] As shown in Figure 6, the receiver performs OFDM demodulator and OTFS transform (SFFT in the figure) procedures on the received time domain sampling points to convert them into QAM symbols in the delayed Doppler domain, and then determines the location of the pilot pulse by signal power detection based on a threshold. Since power boost is generally performed in pilot transmission, it should be noted that the power of the pilot pulse on the receiver side is much larger than the data power, and as can be seen from the principle analysis in the background art, the pilot pulse and the data symbol undergo completely the same fading. Therefore, it is easy to determine the pilot position by power detection. Pilot detection and channel estimation are shown in Figure 6.

[0049] TIFF0007636568000011.tif131170

[0050] As can be seen from the above, single-port transmission has the advantages of occupying fewer resources and having a simple detection algorithm. However, in a communication system with multiple antenna ports, the single-point pilot + guard band method cannot multiplex resources, so there is a risk of a linear increase in overhead. Therefore, the pilot mapping method shown in Figure 7 has been proposed for multi-antenna systems.

[0051] In FIG. 7, the pilot does not exist in the form of a single-point pulse, but is a pilot sequence constructed based on a pseudo-noise (PN) sequence generated in a specific manner, and is mapped to a two-dimensional resource grid on a delay Doppler plane according to a specific rule. Hereinafter, the resource position occupied by the pilot sequence is referred to as a pilot resource block 701. The part adjacent to the pilot resource block 701 is a pilot guard band 702, which is composed of blank resource elements that do not transmit any signal / data. Similar to the single-point pilot in FIG. 5, a guard band 702 is also provided around the pilot resource block 701 to avoid mutual interference with data 703. The calculation method of the guard band width is the same as that in the single-point pilot mapping mode in FIG. 5. However, in the resource portion where the pilot sequence is mapped, pilots with low relevance to pilot sequences of different ports may be selected and overlapped and mapped to the same resource block, and then the receiver side detects the pilot sequence using a specific algorithm to distinguish pilots corresponding to different antenna ports. Since the transmitting side performs complete resource multiplexing, the pilot overhead in the multi-antenna port system can be significantly reduced.

[0052] TIFF0007636568000012.tif78170

[0053]

number

[0054] TIFF0007636568000014.tif95170

[0055] The scheme of FIG. 8 (abbreviated as pilot sequence) and the scheme of FIG. 5 (abbreviated as pilot pulse) each have advantages and disadvantages. The advantages of the pilot sequence scheme are as follows: 1) It is advantageous for multi-port / multi-user multiplexing. 2) The accuracy of sequence detection can be flexibly adjusted. 3) It eliminates guard symbol overhead. 4) Even if the overhead is insufficient (i.e., the reserved bandwidth of the pilot guard band is smaller than the width that does not cause mutual interference between the receiving data and the pilot pulse calculated based on the maximum delay and maximum Doppler of the channel), it is possible to maintain a certain channel estimation accuracy and ensure that the system performance loss is within the receivable range. The disadvantages are as follows: 1) The detection complexity of sequence association / matching is high. 2) The accuracy is limited by the length of the sequence.

[0056] The advantages of the pilot pulse method are as follows: 1) It only requires simple energy detection on the receiving side. 2) It is possible to improve the detection success rate by using power boost (i.e., the transmitter independently increases the transmission power of the pilot signal). The disadvantages are as follows: 1) It is necessary to set up an independent guard band for each pilot pulse, which results in large overhead during multi-port transmission.

[0057] The above advantages and disadvantages can be used to summarize the performance of the two methods in each case. In addition, in some cases, the overhead of the pilot protection interval is limited and insufficient to completely cover the possible delay and Doppler shift of the channel, and the pilot sequence method still shows acceptable performance, but the pilot pulse method has a very large performance loss. As shown in Figure 9, in the special case shown in the figure (large channel delay and Doppler shift), even when the pilot overhead reaches 60%, the performance of the pilot pulse method is still significantly inferior to that of the pilot sequence method.

[0058] In the delayed Doppler domain, a general method for constructing pilot (or reference signal) sequences is as follows: First, generate a base sequence. Then, modulate the base sequence to generate pilot sequences. Optionally, OCC may also be used on the pilot sequences to further improve orthogonality.

[0059] Wherein, the basic sequence may be a ZC sequence or a PN sequence, wherein the PN sequence further includes an M sequence, a Gold sequence, a Kasami sequence, a Barker sequence, etc.

[0060] The general procedure for inserting pilots at the transmitter is as follows: the pilot sequence and data are modulated separately and then placed into the same delayed Doppler resource block; the pilot and data occupy orthogonal resources and are separated by a guard band; the entire delayed Doppler resource block including the pilot and data is transformed into the time-frequency domain by ISSFT, and then transformed into a time-domain signal by OFDM-like processing for transmission.

[0061] Second, cell-free networks.

[0062] In traditional cell-based systems, each cell has a specific coverage area, and when a UE communicates with the cell, the downlink or uplink signal is associated with the information of the cell (e.g., cell ID). When a UE moves between different cells, it needs to perform cell switching or cell reselection. UEs at cell boundaries are generally subject to interference from nearby cells (inter-cell interference).

[0063] The concept of cell free discards the idea of ​​cells, and as shown in Figure 10, the system is now composed of many dense access points (APs) or TRPs, and the UE communicates with one or more nearby APs / TRPs. When the UE moves between different APs, the serving AP (which may be one AP or multiple APs) of the UE changes. In cell free architecture, there is no concept of cell ID, and no switching between cells or cell re-election occurs. In general, a UE will not experience strong interference from nearby APs (the reason is that the N APs close to the UE are generally all serving APs of the UE).

[0064] Based on the above cell-free technology, the concept of super cells will be selectively introduced.

[0065] The network configuration of the super cell is shown in Figure 11. The super cell may be realized by a single-frequency network (SFN) transmission method using multiple TRPs or APs.

[0066] In the SFN transmission mode, multiple TRPs or APs transmit similar signals, no co-channel interference occurs between different TRPs or APs, and multiple signals can improve the signal to interference plus noise ratio (SINR), transmission quality and coverage effect. Multiple TRPs or APs constituting an SFN may share one cell ID, which is called a super cell ID. Multiple TRPs or APs may transmit signals in the manner of SFN transmission, for example, in which each TRP or AP transmits with a wide beam, and at a certain time, a terminal can receive the wide beams transmitted from multiple TRPs or APs, and obtain diversity gain. In the SFN transmission mode, a terminal does not need to frequently reselect or switch cells between TRPs or APs.

[0067] In one implementation, the UE uses the super cell for mobility management or small packet transmission and reception, and transmits data through one or more neighboring TRPs.

[0068] One of the core problems of cell free is how to determine which TRP or AP to dynamically serve a terminal user from among many TRPs or APs. Currently, the terminal uses the initial access procedure to realize the selection and attachment of a TRP.

[0069] 3: Basic procedures for terminal system access.

[0070] 1. Initial network research: includes receiving synchronization information and system information of Synchronization Signal Block (SSB), specifically, first receiving Primary Synchronization Signal (PSS), then Secondary Synchronization Signal (SSS), and then Physical Broadcast Channel (PBCH), and obtains SSB index, and information in PBCH Demodulation Reference Signal (DMRS) and Master Information Block (MIB).

[0071] 2. Using the acquired information, broadcast system information (SI) is received, which includes information required for system access.

[0072] 3. Perform random access using the information required for system access obtained above.

[0073] The above is the initial access procedure in a NR single base station cell. The UE only receives SSB from the current cell, obtains system information using the synchronization signal (including PSS and SSS) in the detected SSB and the reference signal (DMRS) and data information (MIB) in the PBCH, and performs further random access by transmitting an uplink message. In the above procedure, the pilot for synchronization (PSS and SSS) and the data part (contents in the PBCH) containing the system message are closely spaced.

[0074] The access method of the embodiment of the present application will be described in detail below with reference to the drawings.

[0075] Please refer to Figure 12, which is a flow chart of an access method provided in an embodiment of the present application. The access method of the embodiment of the present application may be performed by a terminal.

[0076] As shown in FIG. 12, the access method provided in the embodiment of the present application may include the following steps 1201 and 1202.

[0077] In step 1201, a terminal obtains a first delayed Doppler domain data set obtained by mapping N pilot signals to resource locations of a first delayed Doppler domain resource block, where N is an integer greater than 1.

[0078] In this embodiment, the pilot signal may include, but is not limited to, a pilot pulse or a pilot sequence, etc. It should be noted that the N pilot signals may be the same or different. If the N pilot signals are the same, the N pilot signals may be mapped to different resource positions in the first delayed Doppler domain resource block, i.e., the resource positions are orthogonal. If the N pilot signals are not the same, the resource positions of the N pilot signals in the first delayed Doppler domain resource block may partially overlap, completely overlap (i.e., the resource positions are the same), or may be orthogonal, and this embodiment is not limited thereto.

[0079] Specifically, the N pilot signals may correspond to N first network side devices, among which the N first network side devices may be any one of different TRPs in a cell free network, different TRPs in the same base station, different super cells in a cell free network, different TRPs and super cells in a cell free network, different cells, different TRPs, etc.

[0080] In step 1202, the terminal accesses P first network side devices according to the detection result of the first delay Doppler domain data set, where P is an integer equal to or smaller than N; The P first network side devices P first network side devices corresponding to the P first resource positions, which are the P resource positions at which a peak is detected in the first delayed Doppler domain resource block; The peak is detected among the P pilot signals, and is any one of the P first network side devices corresponding to the P first pilot signals.

[0081] In this embodiment, the terminal can detect the first delayed Doppler domain data set to obtain a detection result, for example, when the pilot signal is a pilot pulse, the terminal can perform power detection on the first delayed Doppler domain data set to obtain a detection result, and when the pilot signal is a pilot sequence, the terminal can perform sequence correlation detection on the first delayed Doppler domain data set to obtain a detection result.

[0082] Wherein, the detection result may include a peak of the detected pilot signal, such as an energy peak or a power peak, etc. Optionally, the detection result may further include at least one of an SNR value, an RSRP value, a delay value, and a Doppler value, etc., measured based on the pilot signal.

[0083] It should be noted that the P first network side devices may include all of the first network side devices corresponding to all resource positions where peaks are detected, or may include some of the first network side devices corresponding to all resource positions where peaks are detected. For example, the P first network side devices may include only the first network side devices corresponding to the resource position with the largest detected peak, or P first network side devices selected from the first network side devices corresponding to all resource positions where peaks are detected based on the acquired a priori information, where the a priori information may include at least one of a detection threshold, a delay threshold, a Doppler threshold, a maximum number of simultaneous accesses of the network side devices supported by the terminal, etc., but are not limited to these.

[0084] In one embodiment, the pilot signals may be mapped to different resource locations of the first delayed Doppler domain resource block, and different first network side devices may be distinguished according to different resource locations. Specifically, the terminal device may detect each resource location, and when a peak is detected at a certain resource location, the first network side device corresponding to the resource location may be determined as a candidate network side device for access selection.

[0085] In another embodiment, different pilot signals may be mapped to the same resource location of the first delayed Doppler domain resource block, and different first network side devices may be distinguished according to different pilot signals. Specifically, the terminal device may detect the first delayed Doppler domain resource block according to each pilot signal, and when a peak is detected according to a certain pilot signal, the first network side device corresponding to the pilot signal may be determined as a candidate network side device for access selection.

[0086] In another embodiment, different pilot signals may be mapped to different resource positions of the first delayed Doppler domain resource block, and different first network side devices may be distinguished according to different pilot signals, and different first network side devices may be distinguished according to different resource positions. Specifically, the terminal device may detect each resource position of the first delayed Doppler domain resource block according to each pilot signal, and when a peak is detected at a resource position based on a certain pilot signal, the first network side device corresponding to the pilot signal or resource position may be determined as a candidate network side device for access selection.

[0087] According to the access method of the embodiment of the present application, the terminal can select access based on a pilot signal transmitted independently from the first network side device, thereby realizing separation of synchronization signals and system information in SSB and reducing resource overhead for initial access. In addition, the pilot signal selected by the first network side device is processed and transmitted using OTFS technology, thereby improving the reliability of the selection of the first network side device.

[0088] Optionally, the N pilot signals are pilot pulses or pilot sequences.

[0089] In this embodiment, the pilot signal can be a pilot pulse or a pilot sequence. It is necessary to note that when the pilot signal is a pilot pulse, the N pilot signals can be the same pilot pulse. When the pilot signal is a pilot sequence, the N pilot signals can be different pilot sequences or the same pilot sequence.

[0090] Optionally, if the N pilot signals are pilot sequences, The resource positions to which the N pilot signals are mapped are orthogonal, the N pilot signals are the same pilot sequence, and the P first network side devices are P first network side devices corresponding to the P first resource positions; The resource positions to which the N pilot signals are mapped are orthogonal or partially overlap each other, the N pilot signals are different pilot sequences, and the P first network side devices are P first network side devices corresponding to the P first resource positions or P first network side devices corresponding to the P first pilot signals; Any one of the following conditions is satisfied: the resource positions to which the N pilot signals are mapped are the same, the N pilot signals are different pilot sequences, and the P first network side devices are P first network side devices corresponding to the P first pilot signals.

[0091] In this embodiment, the resource positions where the N pilot signals are mapped are orthogonal may be understood to mean that the resource positions where the N pilot signals are mapped do not completely overlap or are not the same. The resource positions where the N pilot signals are mapped are the same may be understood to mean that the resource positions where the N pilot signals are mapped are completely overlapped. The N pilot signals are different pilot sequences may be understood to mean that the N pilot signals are orthogonal or quasi-orthogonal.

[0092] In one embodiment, when N pilot signals are the same pilot sequence, the N pilot signals may be mapped to orthogonal resource positions in a first delayed Doppler domain resource block, so that the terminal can distinguish different first network side devices according to the resource positions mapped by the N pilot signals, and correspondingly, in this case, the P first network side devices are the P first network side devices corresponding to the P first resource positions. Optionally, a pilot guard band may be left between the orthogonal resource positions to ensure that they are still orthogonal at the receiving side after channel passage.

[0093] For example, as shown in FIG. 13, the N first network side devices include two TRPs, which are denoted as TRP_1 and TRP_2. Because TRP_1 and TRP_2 are spatially separated, the channels CH_1 (channel I in the figure) and CH_2 (channel II in the figure) from TRP_1 and TRP_2 to the terminal are independent of each other. TRP_1 and TRP_2 map pilot signals to orthogonal resource positions in the same delay Doppler domain resource block, that is, the pilot signals transmitted by TRP_1 and TRP_2 on the same delay Doppler domain resource block are orthogonal to each other in resources, and a pilot guard band is reserved to ensure that the pilot signals are also orthogonal at the terminal side after passing through the channel. In practical applications, each TRP may map pilot signals on a specific resource position belonging to it, and the remaining other resource positions are left as pilot guard bands. It should be noted that the pilot guard band may only occupy a part of a delay Doppler (DD) domain grid, that is, only a part of a DD domain resource block.

[0094] In another embodiment, when N pilot signals are different pilot sequences, the N pilot signals may be mapped to the same resource location in a first delayed Doppler domain resource block, so that the terminal can distinguish different first network side devices according to the pilot sequences, and correspondingly, in this case, the P first network side devices are the P first network side devices corresponding to the P first resource locations. Optionally, a pilot guard band may be left between the N orthogonal pilot signals to ensure that they are still orthogonal at the receiving side after channel passage.

[0095] For example, as shown in FIG. 14, the N first network side devices include two TRPs, denoted as TRP_1 and TRP_2. The two TRPs transmit pilot sequences to the same terminal on the same resource block in the delay Doppler domain. Because TRP_1 and TRP_2 are spatially separated, the channels CH_1 (channel I in the figure) and CH_2 (channel II in the figure) from TRP_1 and TRP_2 to the terminal are independent of each other. A pilot guard band is reserved to ensure that the pilot sequences transmitted by TRP_1 and TRP_2 on the same resource block in the delay Doppler domain are orthogonal or quasi-orthogonal, and are also orthogonal at the terminal after passing through the channel. In practical applications, each TRP may map a pilot sequence on a specific resource position belonging to it, and the remaining other resource positions are left free as the pilot guard band. It should be noted that the pilot guard band may only occupy a part of the DD domain lattice, that is, only a part of the DD domain resource block.

[0096] In another embodiment, when the N pilot signals are different pilot sequences, the N pilot signals may be mapped to orthogonal resource positions in a first delayed Doppler domain resource block, so that the terminal can distinguish different first network side devices based on the pilot sequences, and can also distinguish different first network side devices based on resource positions; correspondingly, in this case, the P first network side devices may be P first network side devices corresponding to the P first resource positions, or P first network side devices corresponding to the P first pilot signals.

[0097] Optionally, when the N pilot signals are pilot pulses, time synchronization between the terminal and N first network side devices corresponding to the N pilot signals; The resource positions to which the N pilot signals are mapped are orthogonal; The P first network side devices are P first network side devices corresponding to the P first resource positions.

[0098] In this embodiment, synchronizing the time between the terminal and the N first network side devices may include synchronizing the time between the N first network side devices and synchronizing the time between the terminal and each of the N first network side devices. In this case, the P first network side devices are the P first network side devices corresponding to the P first resource positions.

[0099] The resource positions where the N pilot signals are mapped are orthogonal, which may be understood to mean that the resource positions where the N pilot signals are mapped are not completely overlapped or the same. Optionally, a pilot guard band may be left between the orthogonal resource positions to ensure that the orthogonal resource positions are still orthogonal at the receiving end after the channel has passed.

[0100] Specifically, when the N pilot signals are pilot pulses, the resource positions to which the N pilot signals are mapped are orthogonal. For example, as shown in FIG. 15, the N first network side devices include two TRPs, which are denoted as TRP_1 and TRP_2. Since TRP_1 and TRP_2 are spatially separated, the channels CH_1 (channel I in the figure) and CH_2 (channel II in the figure) from TRP_1 and TRP_2 to the terminals are independent of each other. The pilot signals transmitted by TRP_1 and TRP_2 on the same delayed Doppler domain resource block are orthogonal to each other in resources (the pilot resources of the two TRPs are the DD domain lattice filled with the left diagonal line and the DD domain lattice filled with the right diagonal line in FIG. 15, respectively), and a pilot guard band is left to ensure that the pilot signals are also orthogonal at the receiving side after passing through the channel. In practical applications, each TRP may map a pilot pulse on a specific resource position belonging to it, and the remaining other resource positions are left vacant as pilot guard bands. It should be noted that the pilot guard band may occupy only a part of the DD domain grid, i.e., only a part of the DD domain resource blocks.

[0101] If the N pilot signals are pilot pulses, it is necessary to further ensure that time is synchronized between the terminal and the N first network side devices corresponding to the N pilot signals. Optionally, before the step of receiving N sets of time domain sampling points, the method includes: The method may further include a step of the terminal receiving a regular synchronization signal transmitted from a second network side device and used for time synchronization between the terminal and the N first network side devices corresponding to the N pilot signals.

[0102] Wherein, the second network side device may be, for example, a super cell. The time synchronization may be, for example, frame regular synchronization. Specifically, after the terminal receives a regular synchronization signal from the second network side device, the terminal can realize time synchronization with N first network side devices according to the regular synchronization signal.

[0103] Optionally, this embodiment may separate the acquisition of the regular synchronization signal during the initial access procedure from the selection and attachment of the first network side device, for example, the second network side device may transmit one wide-area coverage regular synchronization signal that is used only to provide regular synchronization, such as frame regular synchronization, to the terminal, and then the terminal may select the first network side device based on the above steps 1201-1202 after acquiring the regular synchronization signal.

[0104] Optionally, the step of the terminal accessing P first network side devices according to the detection result of the first delay Doppler domain data set includes: The terminal detects the first delay Doppler domain data set according to first a priori information to obtain a detection result; The terminal accesses P first network side devices according to the detection result and second a priori information; When the pilot signal is a pilot pulse, the first a priori information includes a resource location set for mapping the pilot signal in the first delayed Doppler domain resource block; when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource location set for mapping the pilot signal in the first delayed Doppler domain resource block and a pilot sequence set; The second a priori information is A target threshold value representing a channel quality between the terminal and a network side device; The terminal may include at least one item of a maximum number of simultaneous accesses to a network side device supported by the terminal.

[0105] In this embodiment, the resource location set onto which pilot signals in the first delay Doppler domain resource block are mapped can indicate to the terminal a set of sub-domains of a delay Doppler (DD) domain on which pilot signal detection needs to be performed, so that the terminal may perform pilot signal detection only for each resource location of the resource location set, i.e., the terminal only needs to detect limited sampling points, thus reducing the detection complexity.

[0106] The pilot sequence set can indicate a set of candidate pilot sequences that the first network side device can transmit, so that the terminal only needs to detect the candidate pilot sequences in the pilot sequence set, i.e., only a limited number of candidate pilot sequences need to be detected, and thus the detection complexity can be reduced.

[0107] The target threshold is for representing a channel quality between the terminal and a network side device, and is for the terminal to evaluate the channel quality between the terminal and the network side device. Optionally, the target threshold may include at least one of a detection threshold, a delay threshold, and a Doppler threshold.

[0108] The detection threshold may include a Signal Noise Ratio (SNR) threshold, a Reference Signal Receiving Power (RSRP) threshold, etc. For example, the terminal may select and attach a first network side device having an SNR value or an RSRP value, etc., measured based on the pilot signal that is greater than the detection threshold. For the delay threshold, for example, the terminal may select and attach a first network side device having a delay value measured based on the pilot signal that is smaller than the delay threshold. For the Doppler threshold, for example, the terminal may select and attach a first network side device having a Doppler value measured based on the pilot signal that is smaller than the Doppler threshold.

[0109] It should be noted that when the target threshold includes at least two of the detection threshold, delay threshold, and Doppler threshold, the terminal may select the first network side device by comprehensively considering multiple measurement indicators. For example, when the target threshold includes the detection threshold, delay threshold, and Doppler threshold, the terminal may select and attach a first network side device whose SNR value or RSRP value, etc. measured based on a pilot signal is greater than the detection threshold, whose measured delay value is smaller than the delay threshold, and whose measured Doppler value is smaller than the Doppler threshold.

[0110] The above-mentioned maximum number of simultaneous accesses of network side devices supported by the terminal indicates the maximum number of network side devices that the terminal can access, that is, the maximum number of network side devices that can provide services to the same terminal simultaneously.

[0111] It should be noted that regardless of whether the pilot signal is a pilot pulse or a pilot sequence, the second a priori information may include at least one of a target threshold and a maximum number of simultaneous accesses of network side devices supported by the terminal.

[0112] It is further necessary to explain that the first a priori information and the second a priori information may be configured in advance by a protocol, or may be configured by a third network side device, for example, the first a priori information and the second a priori information may be acquired by a broadcast message of a supercell. Note that, when the first a priori information and the second a priori information are configured by a third network side device, the first a priori information and the second a priori information may be configured by the same message or by different messages.

[0113] In an embodiment of the present application, the terminal detects the first delay Doppler domain data set using first a priori information to obtain a detection result, thereby reducing the detection complexity; and the terminal accesses P first network side devices using the detection result and second a priori information, thereby improving the reliability of selecting the first network side device to access.

[0114] Optionally, the step of the terminal acquiring a first delay Doppler domain data set comprises: receiving, by the terminal, a set of time domain sampling points determined based on N second delay Doppler domain data sets, each of the N second delay Doppler domain data sets being obtained by mapping one pilot signal to a first delay Doppler domain resource block; The terminal recovers from the set of time domain sampling points to obtain a first delayed Doppler domain data set.

[0115] In this embodiment, the above-mentioned time domain sampling point set may be a superposition signal of time domain sampling points transmitted from N first network side devices, and for the time domain sampling points transmitted from each first network side device, each first network side device may map one pilot signal to one resource position of a first delay Doppler domain resource block to obtain one second delay Doppler domain data set corresponding to the delay Doppler domain resource block, and then the first network side device converts the second delay Doppler domain data set into a time-frequency domain data set through ISSFT, and further converts the time-frequency domain data set into time domain sampling points to obtain time domain sampling points corresponding to the second delay Doppler domain data set.

[0116] Correspondingly, in the opposite direction to the signal processing direction of the first network side device, the terminal may first transform the time domain sampling point set into a time-frequency domain data set, and then perform SFFT transformation and recovery on the time-frequency domain data set to obtain a first delay Doppler domain data set. It should be noted that the first delay Doppler domain data set is located in a first delay Doppler domain resource block, and the first delay Doppler domain data set includes N pilot signals that are respectively mapped to resource positions of the first delay Doppler domain resource block.

[0117] Please refer to Figure 16, which is a flow chart of the access method provided in the embodiment of the present application. The access method in the embodiment of the present application is executed by a first network side device.

[0118] As shown in FIG. 16, the access method provided in the embodiment of the present application may include the following steps 1601 and 1602.

[0119] In step 1601, a first network side device maps a pilot signal to a resource location of a first delay Doppler domain resource block to obtain a second delay Doppler domain data set.

[0120] In this embodiment, the first pilot signal may be a pilot pulse or a pilot sequence.

[0121] In step 1602, the first network side device transmits the time domain sampling points determined based on the second delay Doppler domain data set to a terminal.

[0122] In this embodiment, the first network side device can transform the second delayed Doppler domain data set into a time-frequency domain resource set through ISSFT, and then transform the time-frequency domain resource set into a time domain sampling point and send it to the terminal.

[0123] According to the access method of the embodiment of the present application, the first network side device can transmit the selected pilot signal to the terminal independently, thereby realizing the separation of the synchronization signal and the system information in the SSB and reducing the resource overhead of the initial access; and the first network side device can process and transmit the selected pilot signal by the OTFS technology, thereby improving the reliability of the selection of the first network side device.

[0124] Optionally, the pilot signal is a pilot pulse or a pilot sequence.

[0125] For the implementation of this embodiment, please refer to the related description of the embodiment shown in FIG. 12, and detailed description will be omitted here.

[0126] Optionally, when the pilot signal is a pilot pulse, time is synchronized between the first network side device and the terminal.

[0127] For the implementation of this embodiment, please refer to the related description of the embodiment shown in FIG. 12, and detailed description will be omitted here.

[0128] Since this embodiment is an embodiment of a network side device corresponding to the method embodiment of Fig. 12, reference can be made to the relevant description in the method embodiment of Fig. 12, and it is necessary to note that the same useful effects can be achieved, and detailed description will be omitted here to avoid repetition.

[0129] It should be noted that the various optional embodiments introduced in the examples of the present application may be realized in combination with each other or alone, and the examples of the present application are not intended to be limiting in this respect.

[0130] For ease of understanding, the following description will be given with reference to an example.

[0131] Example 1: The pilot pulses are the same, and the TRPs are differentiated by different pilot pulse mapping positions.

[0132] For example, as shown in FIG. 15, the N first network side devices include two TRPs, which are denoted as TRP_1 and TRP_2. Since TRP_1 and TRP_2 are spatially separated, the channels CH_1 (channel I in the figure) and CH_2 (channel II in the figure) from TRP_1 and TRP_2 to the terminals are independent of each other. The pilot signals transmitted by TRP_1 and TRP_2 on the same delay Doppler domain resource block are orthogonal to each other in resources (the pilot resources of the two TRPs are the DD domain lattice filled with the left diagonal line and the DD domain lattice filled with the right diagonal line in FIG. 15, respectively), and the pilot guard band is left to ensure that the pilot signals are also orthogonal at the receiving end after passing through the channel. In practical applications, each TRP may map a pilot pulse on a specific resource position belonging to it, and the remaining other resource positions are left free, for example, as a pilot guard band. It should be noted that the pilot guard band may only occupy a part of the DD domain lattice, that is, only a part of the DD domain resource block. After completing the mapping of pilot pulses to resource positions of the delayed Doppler domain resource block, each TRP can transform the delayed Doppler domain symbols into the time-frequency domain by ISSFT, and then transform the time-frequency domain into time-domain sampling points for transmission.

[0133] At the receiving side, that is, at the terminal side, the terminal can restore the received time domain sampling points to the time frequency domain, and obtain the sum signal of the signal transmitted from TRP_1 after passing through CH_1 and the signal transmitted from TRP_2 after passing through CH_2, which cannot be distinguished in the time frequency domain. Therefore, the terminal can perform SFFT transformation to restore the sum signal to the delayed Doppler domain, and obtain the received signal in the delayed Doppler domain shown at the bottom of Figure 15. Due to the effect of the multipath channel, the pilot pulse will have delay and Doppler shift on the delay Doppler map on the terminal side. However, the pilot protection band is reserved in advance, and the size of the pilot protection band can completely cover the maximum delay and Doppler spread of the channel between each TRP and the terminal. Therefore, no matter what delay Doppler response the pilot pulse experiences in the channel, in the delay Doppler map on the terminal side, the pilot pulse corresponding to each TRP will always be in the specific partial area where the TRP maps the pilot pulse. This ensures that the terminal can accurately determine the initial area where the pilot pulse is mapped through power detection, and further accurately identify the TRP information indicated by the pilot pulse position.

[0134] Correspondingly, the terminal can select an appropriate TRP based on the a priori information of the pilot mapping position and its own signal power measurement for each mapping sub-region (i.e., the specific sub-region to which the above pilot pulse is mapped) to perform a subsequent uplink or random access procedure.

[0135] In this example, it is necessary to explain that time is synchronized between each TRP and between the terminal and each TRP. The UE may acquire time synchronization (e.g., frame regular synchronization) in advance through other signals transmitted from the super cell. Optionally, a method other than NR may be used to separate the acquisition of regular synchronization signal during initial access from TRP selection and attachment. For example, the super cell transmits a wide-area coverage regular synchronization signal that is only used to provide the terminal with frame regular synchronization, and the UE selects a TRP using the above method after acquiring the regular synchronization signal.

[0136] In order to reduce the complexity of terminal detection, the terminal may obtain a priori information related to pilot configuration, and the a priori information may be pre-configured in a protocol or obtained through a super cell broadcast message. Specifically, the a priori information of pilot configuration, i.e., the pilot configuration information, may include at least one of the fields shown in Table 1.

[0137] Table 1 Pilot allocation information TIFF0007636568000015.tif17170

[0138] In Table 1, the measurement thresholds are the target thresholds. For specific details, please refer to the relevant description of the target thresholds, and detailed descriptions will be omitted here.

[0139] The above-mentioned maximum TRP connection number is the maximum number of simultaneous accesses of the network side device supported by the above-mentioned terminal. For specific details, please refer to the relevant description of the above-mentioned maximum number of simultaneous accesses of the network side device supported by the above-mentioned terminal. Detailed description will be omitted here.

[0140] The above pilot mapping position set is a resource position set onto which pilot signals in the first delayed Doppler domain resource block are mapped. For specific content, please refer to the relevant description of the resource position set onto which pilot signals in the first delayed Doppler domain resource block are mapped, and detailed description thereof will be omitted here.

[0141] Optionally, the pilot placement information may further include information on common placement parameters that are not related to some delay Doppler domain, such as pilot period, pilot location frequency band, and measurement window placement.

[0142] Example 2: The pilot sequences are the same, and the TRPs are distinguished by different pilot sequence mapping positions.

[0143] For example, as shown in FIG. 13, the N first network side devices include two TRPs, denoted as TRP_1 and TRP_2. Because TRP_1 and TRP_2 are spatially separated, the channels CH_1 and CH_2 from TRP_1 and TRP_2 to the terminal are independent of each other. A pilot guard band is reserved to ensure that TRP_1 and TRP_2 map pilot sequences to orthogonal resource positions in the same-delay Doppler domain resource block, that is, the pilot sequences transmitted by TRP_1 and TRP_2 on the same-delay Doppler domain resource block are orthogonal to each other in resources, and are also orthogonal at the terminal side after passing through the channel. Each TRP may map a pilot signal on a specific resource position belonging to it, and the remaining other resource positions are left free, for example, as a pilot guard band. It is necessary to note that the pilot guard band may only occupy a part of the DD domain grid. After TRP_1 and TRP_2 complete the mapping of pilot sequences to delay Doppler domain resource blocks, each TRP transforms the delay Doppler domain symbols into the time-frequency domain through ISSFT, and then transforms the time-frequency domain into time-domain sampling points for transmission.

[0144] At the receiving side, that is, at the terminal side, the terminal can restore the received time domain sampling points to the time frequency domain, and obtain the sum signal of the signal transmitted from TRP_1 after passing through CH_1 and the signal transmitted from TRP_2 after passing through CH_2, which cannot be distinguished in the time frequency domain. Therefore, the terminal performs SFFT transformation on the sum signal to restore it to the delayed Doppler domain, and obtains the received signal in the delayed Doppler domain shown at the bottom of Figure 13. Due to the effect of the multipath channel, the pilot will have delay and Doppler shift on the delay Doppler map of the terminal. However, the pilot protection band is reserved in advance, and the size of the pilot protection band can completely cover the maximum delay and Doppler spread of the channel between each TRP and the terminal. Therefore, no matter what delay Doppler response the pilot experiences in the channel, in the delay Doppler map on the terminal side, the pilot sequence corresponding to each TRP will always be in the specific partial area where the TRP maps the pilot sequence. This ensures that the terminal can accurately determine the initial area where the pilot sequence is mapped through pilot sequence detection, and further accurately identify the TRP information indicated by the pilot sequence position.

[0145] Correspondingly, the terminal can select an appropriate TRP based on the a priori information of the pilot mapping position and according to its own signal power measurement for each mapping sub-region (i.e., the specific sub-region into which the above pilot sequence is mapped) to perform the subsequent uplink access procedure.

[0146] It should be noted that in this example, there is no need to synchronize time early between each TRP. The UE may synchronize time by detection based on delayed Doppler domain sequences.

[0147] In order to reduce the complexity of terminal detection, the terminal may obtain a priori information related to pilot configuration, and the a priori information may be pre-configured in a protocol or obtained through a super cell broadcast message. Specifically, the a priori information of pilot configuration, i.e., the pilot configuration information, may include at least one of the fields shown in Table 2.

[0148] Table 2 Pilot allocation information TIFF0007636568000016.tif17170

[0149] In Table 2, the measurement thresholds are the target thresholds. For specific details, please refer to the relevant description of the target thresholds, and detailed descriptions will be omitted here.

[0150] The above-mentioned maximum TRP connection number is the maximum number of simultaneous accesses of the network side device supported by the above-mentioned terminal. For specific details, please refer to the relevant description of the above-mentioned maximum number of simultaneous accesses of the network side device supported by the above-mentioned terminal. Detailed description will be omitted here.

[0151] The above pilot mapping position set is a resource position set onto which pilot signals in the first delayed Doppler domain resource block are mapped. For specific content, please refer to the relevant description of the resource position set onto which pilot signals in the first delayed Doppler domain resource block are mapped, and detailed description thereof will be omitted here.

[0152] Optionally, the pilot placement information may further include information on common placement parameters that are not related to some delay Doppler domain, such as pilot period, pilot location frequency band, and measurement window placement.

[0153] Example 3: The pilot sequence mapping positions are the same, and the TRPs are differentiated by different pilot sequences.

[0154] For example, as shown in FIG. 14, the N first network side devices include two TRPs, denoted as TRP_1 and TRP_2. The two TRPs transmit pilot sequences to the same terminal on the same resource block in the delay Doppler domain. Because TRP_1 and TRP_2 are spatially separated, the channels CH_1 and CH_2 from TRP_1 and TRP_2 to the terminal are independent of each other. A pilot guard band is reserved to ensure that the pilot sequences transmitted by TRP_1 and TRP_2 on the same resource block in the delay Doppler domain are orthogonal or quasi-orthogonal, and are also orthogonal at the terminal after passing through the channel. As shown in FIG. 14, each TRP maps a pilot sequence at a specific resource position belonging to it, and leaves the remaining other resource positions free, for example, as a pilot guard band. It should be noted that the pilot guard band may occupy only a part of the DD domain grid. After completing the mapping of the pilot sequence to the resource block in the delay Doppler domain, each TRP can transform the symbols in the delay Doppler domain into the time-frequency domain by ISSFT, and then transform the time-frequency domain into time-domain sampling points for transmission.

[0155] At the receiving side, that is, at the terminal side, the terminal restores the received time domain sampling points to the time frequency domain, and obtains the sum signal of the signal transmitted from TRP_1 after passing through CH_1 and the signal transmitted from TRP_2 after passing through CH_2, which cannot be distinguished in the time frequency domain. Therefore, the terminal may perform SFFT transformation on the sum signal to restore it to the delay Doppler domain, and obtain the received signal in the delay Doppler domain shown at the bottom of FIG. 14. Due to the effect of the multipath channel, the pilot sequence will have delay and Doppler shift on the delay Doppler map on the terminal side, but the terminal can use the known pilot sequence to perform multiple pilot sequence detections on the received sampling points. When the transmission signal contains a pilot sequence corresponding to a specific TRP, the terminal can observe a peak on the delay Doppler map obtained based on the detection algorithm when selecting and detecting the pilot (no peaks can be observed when detecting other pilots), and thus the TRP information indicated by the pilot sequence can be accurately identified.

[0156] Correspondingly, the terminal can select an appropriate TRP based on the a priori information of the pilot mapping position and through its own signal power measurement for each mapping sub-region to perform the subsequent uplink access procedure.

[0157] It should be noted that in this example, there is no need to synchronize time early between each TRP. The UE may synchronize time by detection based on delayed Doppler domain sequences.

[0158] In order to reduce the complexity of terminal detection, the terminal may obtain a priori information related to pilot configuration, and the a priori information may be pre-configured in a protocol or obtained through a super cell broadcast message. Specifically, the a priori information of pilot configuration, i.e., the pilot configuration information, may include at least one of the fields shown in Table 2.

[0159] Table 3 Pilot allocation information TIFF0007636568000017.tif17170

[0160] In Table 3, the measurement thresholds are the target thresholds. For specific details, please refer to the relevant description of the target thresholds, and detailed descriptions will be omitted here.

[0161] The above-mentioned maximum TRP connection number is the maximum number of simultaneous accesses of the network side device supported by the above-mentioned terminal. For specific details, please refer to the relevant description of the above-mentioned maximum number of simultaneous accesses of the network side device supported by the above-mentioned terminal. Detailed description will be omitted here.

[0162] For the pilot sequence set, reference may be made to the related description of the pilot sequence set above, and detailed description thereof will be omitted here.

[0163] Optionally, the pilot placement information may further include information on common placement parameters that are not related to some delay Doppler domain, such as pilot period, pilot location frequency band, and measurement window placement.

[0164] Example 4: Differentiating TRPs by different pilot sequences and different mapping positions.

[0165] In this example, the different pilot sequences may be understood to mean that the pilots used by different TRPs are orthogonal or quasi-orthogonal to each other. The different pilot mapping positions may be understood to mean that the resources occupied by the pilot signals of different TRPs on the delayed Doppler domain resource block are not completely the same, for example, the resources occupied by the pilot signals of different TRPs on the delayed Doppler domain resource block are orthogonal, that is, the resources occupied by the pilots used by different TRPs do not overlap, or the resources occupied by the pilots used by different TRPs partially overlap.

[0166] For the relevant processing of the transmitting side and the receiving side, refer to the relevant description of Example 3, and the detailed description will be omitted here. In this example, the a priori information of the pilot arrangement may include at least one of the fields shown in Table 4.

[0167] Table 4 Pilot allocation information TIFF0007636568000018.tif17170

[0168] In Table 4, the measurement thresholds are the target thresholds. For specific details, please refer to the relevant description of the target thresholds, and detailed descriptions will be omitted here.

[0169] The above-mentioned maximum TRP connection number is the maximum number of simultaneous accesses of the network side device supported by the above-mentioned terminal. For specific details, please refer to the relevant description of the above-mentioned maximum number of simultaneous accesses of the network side device supported by the above-mentioned terminal. Detailed description will be omitted here.

[0170] For the pilot sequence set, reference may be made to the related description of the pilot sequence set above, and detailed description thereof will be omitted here.

[0171] The above pilot mapping position set is a resource position set onto which pilot signals in the first delayed Doppler domain resource block are mapped. For specific content, please refer to the relevant description of the resource position set onto which pilot signals in the first delayed Doppler domain resource block are mapped, and detailed description thereof will be omitted here.

[0172] Optionally, the pilot placement information may further include information on common placement parameters that are not related to some delay Doppler domain, such as pilot period, pilot location frequency band, and measurement window placement.

[0173] It should be noted that the entity executing the access method provided in the embodiments of the present application may be an access device or a control module for executing the access method in the access device. In the embodiments of the present application, the access device provided in the embodiments of the present application will be described by taking the access device executing the access method as an example.

[0174] Please refer to FIG. 17, which is a block diagram of an access device provided in an embodiment of the present application.

[0175] As shown in FIG. 17, the access device 1700 includes: an acquisition module 1701 used by a terminal to acquire a first delayed Doppler domain data set obtained by mapping N pilot signals to resource positions of a first delayed Doppler domain resource block, where N is an integer greater than 1; an access module 1702 used by the terminal to access P first network side devices according to the detection result of the first delay Doppler domain data set, where P is an integer equal to or smaller than N; The P first network side devices P first network side devices corresponding to the P first resource positions, which are the P resource positions at which a peak is detected in the first delayed Doppler domain resource block; The peak is detected among the P pilot signals, and is any one of the P first network side devices corresponding to the P first pilot signals.

[0176] Optionally, the N pilot signals are pilot pulses or pilot sequences.

[0177] Optionally, if the N pilot signals are pilot sequences, The resource positions to which the N pilot signals are mapped are orthogonal, the N pilot signals are the same pilot sequence, and the P first network side devices are P first network side devices corresponding to the P first resource positions; The resource positions to which the N pilot signals are mapped are orthogonal or partially overlap each other, the N pilot signals are different pilot sequences, and the P first network side devices are P first network side devices corresponding to the P first resource positions or P first network side devices corresponding to the P first pilot signals; Any one of the following conditions is satisfied: the resource positions to which the N pilot signals are mapped are the same, the N pilot signals are different pilot sequences, and the P first network side devices are P first network side devices corresponding to the P first pilot signals.

[0178] Optionally, when the N pilot signals are pilot pulses, time synchronization between the terminal and N first network side devices corresponding to the N pilot signals; The resource positions to which the N pilot signals are mapped are orthogonal; The P first network side devices are P first network side devices corresponding to the P first resource positions.

[0179] Optionally, the access module: a detection unit, used by the terminal to detect the first delay Doppler domain data set according to first a priori information to obtain a detection result; an access unit used by the terminal to access P first network side devices according to the detection result and second a priori information; When the pilot signal is a pilot pulse, the first a priori information includes a resource location set for mapping the pilot signal in the first delayed Doppler domain resource block; when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource location set for mapping the pilot signal in the first delayed Doppler domain resource block and a pilot sequence set; The second a priori information is A target threshold value representing a channel quality between the terminal and a network side device; The terminal may include at least one item of a maximum number of simultaneous accesses to a network side device supported by the terminal.

[0180] Optionally, the target thresholds include at least one of a detection threshold, a delay threshold, and a Doppler threshold.

[0181] Optionally, the acquisition module: a receiving unit used by the terminal to receive a set of time domain sampling points determined based on N second delay Doppler domain data sets, each of the second delay Doppler domain data sets being obtained by mapping one pilot signal to a first delay Doppler domain resource block; The terminal includes a restoration unit adapted to restore the set of time domain sampling points to obtain a first delayed Doppler domain data set.

[0182] The access device in the embodiment of the present application may be a device, a component in a terminal, an integrated circuit or a chip. The device may be a portable terminal or a non-portable terminal. By way of example, the mobile terminal may include, but is not limited to, the types of terminal 11 listed above, and the non-portable terminal may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), an automated teller machine or a kiosk, etc., and is not specifically limited in the embodiment of the present application.

[0183] The access device in the embodiment of the present application may be a device having an operating system, which may be an Android operating system, an ios operating system, or other possible operating systems, and is not specifically limited in the embodiment of the present application.

[0184] The access device 1700 provided in the embodiment of the present application can implement each step implemented in the method embodiment of FIG. 12, and can achieve similar technical effects, so detailed description will be omitted here to avoid repetition.

[0185] It should be noted that the entity executing the access method provided in the embodiments of the present application may be an access device or a control module for executing the access method in the access device. In the embodiments of the present application, the access device provided in the embodiments of the present application will be described by taking the access device executing the access method as an example.

[0186] Please refer to FIG. 18, which is a block diagram of an access device provided in an embodiment of the present application.

[0187] As shown in FIG. 18, the access device 1800 includes: A mapping module 1801 is used by a first network side device to map pilot signals to resource locations of a first delay Doppler domain resource block to obtain a second delay Doppler domain data set; The first network side device comprises a transmitting module 1802, which is used for transmitting the time domain sampling points determined based on the second delay Doppler domain data set to a terminal.

[0188] Optionally, the pilot signal is a pilot pulse or a pilot sequence.

[0189] Optionally, when the pilot signal is a pilot pulse, time is synchronized between the first network side device and the terminal.

[0190] The access device in the embodiment of the present application may be a device, or may be a component, integrated circuit or chip in the network side device. The network side device may include, but is not limited to, the types of the network side device 12 listed above, and the embodiment of the present application is not specifically limited.

[0191] The access device 1800 provided in the embodiment of the present application can realize each step implemented in the method embodiment of FIG. 16 and achieve similar technical effects, and detailed description thereof will be omitted here to avoid repetition.

[0192] Optionally, as shown in Fig. 19, an embodiment of the present application further provides a communication device 1900, including a processor 1902, a memory 1901, and a program or command stored in the memory 1901 and executable by the processor 1902, for example, when the communication device 1900 is a terminal, the program or command is executed by the processor 1902 to realize each step of the method embodiment of Fig. 12 and achieve the same technical effect. When the communication device 1900 is a network side device, the program or command is executed by the processor 1902 to realize each step of the method embodiment of Fig. 16 and achieve the same technical effect, and detailed description thereof will be omitted here to avoid repetition.

[0193] FIG. 20 is a schematic diagram of the hardware configuration of a terminal for implementing an embodiment of the present application.

[0194] The terminal 2000 includes elements such as, but not limited to, a radio frequency unit 2001, a network module 2002, an audio output unit 2003, an input unit 2004, a sensor 2005, a display unit 2006, a user input unit 2007, an interface unit 2008, a memory 2009 and a processor 2010.

[0195] Those skilled in the art can understand that the terminal 2000 may further include a power source (e.g., a battery) for powering each component, and the power source may be logically connected to the processor 2010 through a power management system, thus realizing functions such as charge / discharge management and power consumption management through the power management system. The structure of the terminal shown in FIG. 20 is not intended to limit the terminal, and the terminal may include more or fewer components than those shown, or a combination of some components, or a different component arrangement, and detailed descriptions thereof will be omitted here.

[0196] It should be understood that in the embodiment of the present application, the input unit 2004 may include a graphics processing unit (GPU) 20041 for processing image data of static or video captured by an image capture device (e.g., a camera) in a video capture mode or an image capture mode, and a microphone 20042. The display unit 2006 may include a display panel 20061, which may be arranged in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 2007 includes a touch panel 20071 and other input devices 20072. The touch panel 20071 is also called a touch screen. The touch panel 20071 may include two parts: a touch detection device and a touch controller. The other input devices 20072 may include, but are not limited to, a physical keyboard, a function button (e.g., a volume control button, a switch button, etc.), a trackball, a mouse, and a control lever, and detailed description thereof is omitted here.

[0197] In the embodiment of the present application, the high frequency unit 2001 receives downlink data from the network side device, processes the data in the processor 2010, and transmits uplink data to the network side device. Typically, the high frequency unit 2001 includes, but is not limited to, an antenna, at least one amplifier, a receiver-transmitter, a coupler, a low-noise amplifier, a duplexer, etc.

[0198] The memory 2009 can be used to store software programs or commands and various data. The memory 2009 may mainly include an area for storing programs or commands and a data storage area, which can store an operating system, applications or commands required for at least one function (e.g., audio playback function, image playback function, etc.). The memory 2009 may also include a high-speed random access memory or a non-volatile memory, among which 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 erasable programmable read-only memory (Electrically EPROM, EEPROM), or a flash memory. For example, at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device may be included.

[0199] The processor 2010 may include one or more processing units, and may selectively integrate an application processor that mainly processes an operating system, a user interface, and applications or commands, etc., and a modem processor that mainly processes wireless communications, such as a baseband processor, in the processor 2010. It is understandable that the modem processor may not be integrated into the processor 2010.

[0200] The processor 2010 is used by a terminal to obtain a first delay Doppler domain data set obtained by mapping N pilot signals to resource locations of a first delay Doppler domain resource block, where N is an integer greater than 1; The high frequency unit 2001 is used by the terminal to access P first network side devices according to the detection result of the first delay Doppler domain data set, where P is an integer equal to or smaller than N; The P first network side devices P first network side devices corresponding to the P first resource positions, which are the P resource positions at which a peak is detected in the first delayed Doppler domain resource block; The peak is detected among the P pilot signals, and is any one of the P first network side devices corresponding to the P first pilot signals.

[0201] Optionally, the N pilot signals are pilot pulses or pilot sequences.

[0202] Optionally, if the N pilot signals are pilot sequences, The resource positions to which the N pilot signals are mapped are orthogonal, the N pilot signals are the same pilot sequence, and the P first network side devices are P first network side devices corresponding to the P first resource positions; The resource positions to which the N pilot signals are mapped are orthogonal or partially overlap each other, the N pilot signals are different pilot sequences, and the P first network side devices are P first network side devices corresponding to the P first resource positions or P first network side devices corresponding to the P first pilot signals; Any one of the following conditions is satisfied: the resource positions to which the N pilot signals are mapped are the same, the N pilot signals are different pilot sequences, and the P first network side devices are P first network side devices corresponding to the P first pilot signals.

[0203] Optionally, when the N pilot signals are pilot pulses, time synchronization between the terminal and N first network side devices corresponding to the N pilot signals; The resource positions to which the N pilot signals are mapped are orthogonal; The P first network side devices are P first network side devices corresponding to the P first resource positions.

[0204] Optionally, the high frequency unit 2001 may further include: The terminal detects the first delay Doppler domain data set according to first a priori information to obtain a detection result; the terminal accesses P first network side devices according to the detection result and the second a priori information; When the pilot signal is a pilot pulse, the first a priori information includes a resource location set for mapping the pilot signal in the first delayed Doppler domain resource block; when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource location set for mapping the pilot signal in the first delayed Doppler domain resource block and a pilot sequence set; The second a priori information is A target threshold value representing a channel quality between the terminal and a network side device; The terminal may include at least one item of a maximum number of simultaneous accesses to a network side device supported by the terminal.

[0205] Optionally, the target thresholds include at least one of a detection threshold, a delay threshold, and a Doppler threshold.

[0206] Optionally, the radio frequency unit 2001 is further adapted for the terminal to receive a set of time domain sampling points determined based on N second delay Doppler domain data sets, each of the second delay Doppler domain data sets being obtained by mapping one pilot signal to a first delay Doppler domain resource block; The processor 2010 is further operable for the terminal to recover from the set of time domain sampling points to obtain a first delayed Doppler domain data set.

[0207] It should be noted that in this embodiment, the terminal 2000 realizes each step in the method embodiment of FIG. 12 in the embodiment of the present application, and can achieve similar useful effects. In order to avoid repetition, detailed description will be omitted here.

[0208] Specifically, an embodiment of the present application further provides a network side device. As shown in Fig. 21, the network device 2100 includes an antenna 211, a radio frequency device 212, and a baseband device 213. The antenna 211 is connected to the radio frequency device 212. In the uplink direction, the radio frequency device 212 receives information through the antenna 211, and transmits the received information to the baseband device 213 for processing. In the downlink direction, the baseband device 213 processes the information to be transmitted and transmits it to the radio frequency device 212, and the radio frequency device 212 processes the received information before transmitting it via the antenna 211.

[0209] The above frequency band processing device may be in a baseband device 213 , and the method performed by the network side device in the above embodiment may be realized in the baseband device 213 , which includes a processor 214 and a memory 215 . The baseband device 213 may, for example, include at least one baseband board having multiple chips installed thereon, and as shown in FIG. 21, one of the chips may, for example, be a processor 214 connected to a memory 215 to call a program in the memory 215 to perform the operations of the network device as shown in the above method embodiments.

[0210] The baseband device 213 may further include a network interface 216 for communicating with the radio frequency device 212, the interface being, for example, a common public radio interface (abbreviated as CPRI).

[0211] Specifically, the network side equipment of the embodiment of the present application further includes a command or program stored in memory 215 and executable by processor 214, and processor 214 calls the command or program in memory 215 to perform each step in the method embodiment of Figure 16, and achieves similar technical effects. In order to avoid repetition, detailed description will be omitted here.

[0212] The embodiments of the present application further provide a computer-readable storage medium storing a computer program, which, when executed by a processor, can realize each step of the above access method embodiment and achieve the same technical effect, and detailed description thereof will be omitted here to avoid repetition, where the computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disk, etc.

[0213] An embodiment of the present application further provides a readable storage medium storing a program or command, which, when executed by a processor, can realize each step of the method embodiment of FIG. 12 or FIG. 16 and achieve similar technical effects, and detailed description thereof will be omitted here to avoid repetition.

[0214] Here, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0215] The embodiments of the present application further provide a chip comprising a processor and a communication interface, the communication interface and the processor being coupled to each other, and the processor executing a program or command of a network side device to realize each step of the method embodiments of Figure 12 or Figure 16 above, and capable of achieving similar technical effects. Detailed description thereof will be omitted here to avoid repetition.

[0216] It should be understood that the chip described in the embodiments of the present application may be referred to as a system chip, a chip system, a system on a chip, or the like.

[0217] It should be noted that in this specification, the terms "comprise", "consist of" or any other variants are intended to include a non-exclusive inclusion, whereby a process, method, article or apparatus that includes a set of elements includes not only those elements, but also other elements not expressly stated or inherent to such process, method, article or apparatus. Unless otherwise specified, an element limited by the phrase "comprises a" does not exclude the presence of other identical elements in the process, method, article or apparatus that includes the element. It should also be noted that the scope of the method and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may include performing functions substantially simultaneously or in the reverse order depending on such functions, for example, the described method may be performed in a different order than described, and various steps may be added, omitted or combined. Also, features described with reference to any example may be combined in other examples.

[0218] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be realized in the form of a combination of software and a necessary common hardware platform, and of course, they can be realized by hardware, but in many cases the former is a more preferred embodiment. Based on this view, the technical solution of the present application can be substantially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes a number of commands that cause a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the embodiments of the present application.

[0219] Although the examples of the present application have been described above with reference to the drawings, the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative and not limiting. Based on the suggestions of the present application, many forms that a person skilled in the art can make without departing from the spirit of the present application and the scope of protection of the claims are all within the scope of protection of the present application.

Claims

1. obtaining a first delay Doppler domain data set by the terminal, the first delay Doppler domain data set being obtained by mapping N pilot signals to resource locations of a first delay Doppler domain resource block, where N is an integer greater than 1; The terminal accesses P first network side devices according to the detection result of the first delay Doppler domain data set, where P is an integer equal to or smaller than N; The P first network side devices P first network side devices corresponding to the P first resource positions, which are the P resource positions at which a peak is detected in the first delayed Doppler domain resource block; The access method is any one of P first network side devices corresponding to P first pilot signals, which are P pilot signals in which a peak is detected.

2. The method of claim 1 , wherein the N pilot signals are pilot pulses or pilot sequences.

3. When the N pilot signals are pilot sequences, The resource positions to which the N pilot signals are mapped are orthogonal to each other, the N pilot signals are the same pilot sequence, and the P first network side devices are P first network side devices corresponding to the P first resource positions; The resource positions to which the N pilot signals are mapped are orthogonal or partially overlap each other, the N pilot signals are different pilot sequences, and the P first network side devices are P first network side devices corresponding to the P first resource positions or P first network side devices corresponding to the P first pilot signals; The method according to claim 2, wherein any one of the following is satisfied: the resource positions to which the N pilot signals are mapped are the same, the N pilot signals are different pilot sequences, and the P first network side devices are P first network side devices corresponding to the P first pilot signals.

4. When the N pilot signals are pilot pulses, time synchronization between the terminal and N first network side devices corresponding to the N pilot signals; The resource positions to which the N pilot signals are mapped are orthogonal; The method according to claim 2 , wherein the P first network side devices are P first network side devices corresponding to the P first resource positions.

5. The step of the terminal accessing P first network side devices based on the detection result of the first delay Doppler domain data set includes: The terminal detects the first delay Doppler domain data set according to first a priori information to obtain a detection result; The terminal accesses P first network side devices according to the detection result and second a priori information; When the pilot signal is a pilot pulse, the first a priori information includes a resource location set for mapping the pilot signal in the first delayed Doppler domain resource block, and when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource location set for mapping the pilot signal in the first delayed Doppler domain resource block and a pilot sequence set; The second a priori information is A target threshold value representing a channel quality between the terminal and a network side device; The method according to claim 1 , further comprising at least one of a maximum number of simultaneous accesses of network side devices supported by the terminal.

6. The method of claim 5 , wherein the target thresholds include at least one of a detection threshold, a delay threshold, and a Doppler threshold.

7. The step of acquiring a first delay Doppler domain data set by the terminal includes: receiving, by the terminal, a set of time domain sampling points determined based on N second delay Doppler domain data sets, each of the second delay Doppler domain data sets being obtained by mapping one pilot signal to a first delay Doppler domain resource block; The method of claim 1 , further comprising: the terminal recovering with the set of time domain sampling points to obtain a first delayed Doppler domain data set.

8. an acquisition module used by a terminal to acquire a first delay Doppler domain data set obtained by mapping N pilot signals to resource locations of a first delay Doppler domain resource block, where N is an integer greater than 1; The terminal includes an access module used to access P first network side devices according to a detection result of the first delay Doppler domain data set, where P is an integer equal to or smaller than N; The P first network side devices P first network side devices corresponding to the P first resource positions, which are the P resource positions at which a peak is detected in the first delayed Doppler domain resource block; The peak is detected as a pilot signal from the P first network side devices corresponding to the P first pilot signals. Access device.

9. A communications device comprising a processor, a memory, and a program or command stored in the memory and executable by the processor, the communications device realizing the steps of the access method according to any one of claims 1 to 7 when the program or command is executed by the processor.

10. A readable storage medium storing a program or command, which, when executed by a processor, implements the steps of the access method according to any one of claims 1 to 7.

11. A computer program product stored in a non-volatile storage medium and executed by at least one processor to implement the access method according to any one of claims 1 to 7.

Images