Access method, device, communication equipment and readable storage medium

Abstract

The present application discloses an access method, apparatus, communication equipment and readable storage medium, the method comprising: a terminal acquires a first delayed Doppler domain data set, the first delayed Doppler domain data set is obtained by mapping N pilot signals to the resource position of the first delayed Doppler domain resource block; the terminal accesses P first network side devices according to the detection result of the first delayed Doppler domain data set; the P first network side devices are any of the following: P first network side devices corresponding to P first resource positions, the P first resource positions are the P resource positions where the peak value is detected on the first delayed Doppler domain resource block; P first network side devices corresponding to P first pilot signals, the P first pilot signals are the P pilot signals where the peak value is detected. In this way, the decoupling of synchronization signals and system information in SSB can be achieved, and the resource overhead of initial access can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to an access method, an apparatus, a communication device, and a readable storage medium. Background Art

[0002] In the initial access process in a single base station cell of the New Radio (NR), the terminal uses the synchronization signal (including primary synchronization information (PSS) and secondary synchronization information (SSS)) in the detected synchronization signal block (SSB), the reference signal (such as the demodulation reference signal (DMRS)) and data information (such as the master message block (MIB)) in the physical broadcast channel (PBCH) to obtain system information (SI), so as to perform random access according to the information required for accessing the system included in the SI. In the above process, the synchronization signal, reference signal and data information are tightly coupled.

[0003] In a cell-free network, since the terminal can receive signals from multiple Transmitting Receiving Points (TRPs), we need to first determine which TRPs the terminal accesses before performing subsequent SI acquisition and random access. If the synchronization signal is used to select the TRP during initial access, the synchronization signal, reference signal, and data information are tightly coupled, which can easily cause a large overhead for TRP selection, and thus a large overhead for initial access. Summary of the invention

[0004] The embodiments of the present application provide an access method, an apparatus, a communication device, and a readable storage medium, which can solve the problem of high initial access overhead caused by the tight coupling of synchronization signals, reference signals, and data information.

[0005] In a first aspect, an embodiment of the present application provides an access method, the method comprising:

[0006] The terminal obtains a first delay Doppler domain data set, where the first delay Doppler domain data set is obtained by mapping N pilot signals to resource positions of a first delay Doppler domain resource block, where N is an integer greater than 1;

[0007] 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 less than or equal to N;

[0008] The P first network-side devices are any of the following:

[0009] P first network-side devices corresponding to P first resource positions, where the P first resource positions are P resource positions where peak values ​​are detected on the first delay-Doppler domain resource block;

[0010] The P first network-side devices correspond to the P first pilot signals, and the P first pilot signals are the P pilot signals whose peak values ​​are detected.

[0011] In a second aspect, an embodiment of the present application provides an access method, the method comprising:

[0012] The first network side device maps the pilot signal to the resource position of the first delay Doppler domain resource block to obtain a second delay Doppler domain data set;

[0013] The first network side device sends a time domain sampling point to the terminal, where the time domain sampling point is determined based on the second delay-Doppler domain data set.

[0014] In a third aspect, an embodiment of the present application provides an access device, the access device comprising:

[0015] An acquisition module, configured to acquire, by a terminal, a first delay Doppler domain data set, wherein the first delay Doppler domain data set is obtained by mapping N pilot signals to a resource position of a first delay Doppler domain resource block, where N is an integer greater than 1;

[0016] An access module, configured for 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 less than or equal to N;

[0017] The P first network-side devices are any of the following:

[0018] P first network-side devices corresponding to P first resource positions, where the P first resource positions are P resource positions where peak values ​​are detected on the first delay-Doppler domain resource block;

[0019] The P first network-side devices correspond to the P first pilot signals, and the P first pilot signals are the P pilot signals whose peak values ​​are detected.

[0020] In a fourth aspect, an embodiment of the present application provides an access device, the access device comprising:

[0021] A mapping module, configured for the first network side device to map the pilot signal to a resource position of the first delay Doppler domain resource block to obtain a second delay Doppler domain data set;

[0022] A sending module is used for the first network side device to send a time domain sampling point to a terminal, where the time domain sampling point is determined based on the second delay Doppler domain data set.

[0023] In a fifth aspect, an embodiment of the present application provides a terminal, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the first aspect.

[0024] In the sixth aspect, an embodiment of the present application provides a network side device, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the second aspect are implemented.

[0025] In the seventh aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0026] In the eighth aspect, an embodiment of the present application provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run a network side device program or instruction to implement the method described in the first aspect, or to implement the method described in the second aspect.

[0027] In an embodiment of the present application, since the terminal can perform access selection based on the pilot signal sent separately by the first network side device, this can achieve decoupling of the synchronization signal and system information in the SSB and reduce the resource overhead of the initial access. In addition, the pilot signal selected by the first network side device is processed and sent through the OTFS technology, which can improve the reliability of the selection of the first network side device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a block diagram of a wireless communication system to which the embodiments of the present application can be applied;

[0029] Figure 2 It is a schematic diagram of the conversion between the delay Doppler domain and the time-frequency domain provided by an embodiment of the present application;

[0030] Figure 3 is a schematic diagram of the relationship between channel responses in different planes provided in an embodiment of the present application;

[0031] Figure 4 1 is a schematic diagram of transceiver processing of an OTFS multi-carrier system provided in an embodiment of the present application;

[0032] Figure 5 It is a schematic diagram of pilot mapping in the delay Doppler domain provided by an embodiment of the present application;

[0033] Figure 6 is a schematic diagram of pilot position detection provided by an embodiment of the present application;

[0034] Figure 7 It is a schematic diagram of pilot resource multiplexing in the delay Doppler domain provided by an embodiment of the present application;

[0035] Figure 8 is a schematic diagram of detecting a pilot sequence provided in an embodiment of the present application;

[0036] Fig. 9 : is a schematic diagram of performance comparison of two pilot design solutions provided in an embodiment of the present application under different pilot overhead conditions;

[0037] Fig.10 is a schematic diagram of a cell-free network structure provided in an embodiment of the present application;

[0038] Fig.11 is a schematic diagram of a super cell structure provided in an embodiment of the present application;

[0039] Fig.12 is a flow chart of an access method provided by an embodiment of the present application;

[0040] Fig.13 It is a schematic diagram of distinguishing TRPs by using different pilot sequence mapping positions provided in an embodiment of the present application;

[0041] Fig.14 It is a schematic diagram of distinguishing TRPs by using different pilot sequences provided in an embodiment of the present application;

[0042] Fig.15 It is a schematic diagram of distinguishing TRPs by using different pilot pulse mapping positions provided in an embodiment of the present application;

[0043] Fig.16 is a flow chart of an access method provided by another embodiment of the present application;

[0044] Fig.17 is a structural diagram of an access device provided by an embodiment of the present application;

[0045] Fig.18 is a structural diagram of an access device provided by another embodiment of the present application;

[0046] Fig.19 is a structural diagram of a communication device provided in an embodiment of the present application;

[0047] Fig. 20 is a structural diagram of a terminal provided in an embodiment of the present application;

[0048] Fig.21 It is a structural diagram of the network side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0051] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also 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 are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. However, the following description describes a New Radio (NR) system for illustrative purposes, and NR terms are used in most of the following descriptions. These technologies can also be applied to applications other than NR system applications, such as the 6th generation (6 th Generation, 6G) communication system.

[0052] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can also be called a terminal device or a user terminal (User Equipment, UE), and the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), a wearable device (Wearable Device) or a vehicle-mounted device (VUE), a pedestrian terminal (PUE) and other terminal side devices, and the wearable device includes: a bracelet, a headset, 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 device 12 can be a cell, a super cell base station or a core network, wherein the base station can be called a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (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 transmitting and receiving point (Transmitting Receiving Point, TRP) or some other suitable term in the field, as long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary.

[0053] For ease of understanding, some contents involved in the embodiments of the present application are described below:

[0054] 1. Orthogonal Time Frequency (OTFS) space.

[0055] The delay and Doppler characteristics of the channel are essentially determined by the multipath channel. Signals that reach the receiver through different paths have different arrival times because of the difference in propagation distances. For example, two echoes s1 and s2 travel distances d1 and d2 respectively to reach the receiver, so the time difference between their arrival at the receiver is c is the speed of light. Due to the time difference between echoes s1 and s2, their coherent superposition at the receiver side causes the observed signal amplitude jitter, that is, the fading effect. Similarly, the Doppler spread of the multipath channel is also caused by the multipath effect. The Doppler effect is due to the relative speed between the transmitter and receiver. The signals that reach the receiver through different paths have different incident angles relative to the antenna normal, which causes the difference in relative speed, and then causes the Doppler frequency shift of signals on different paths to be different. Assuming that the original frequency of the signal is f, the relative speed of the transmitter and receiver is Δv, and the angle of incidence between the signal and the normal of the receiving antenna is θ, then: Obviously, when the two echoes s1 and s2 travel through different paths to reach the receiving antenna and have different incident angles θ1 and θ2, the Doppler frequency shifts Δf1 and Δf2 they obtain are also different. In summary, the signal seen by the receiver is the superposition of component signals with different delays and Dopplers from different paths, which is reflected as a received signal with fading and frequency shift relative to the original signal. Delay Doppler analysis of the channel helps to collect the delay Doppler information of each path, thereby reflecting the delay Doppler response of the channel.

[0056] The OTFS modulation technology logically maps the information in a data packet of size M×N, such as a Quadrature Amplitude Modulation (QAM) symbol, to an M×N grid point on a two-dimensional delay Doppler plane, that is, the pulse in each grid point modulates a QAM symbol in the data 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. This transformation is mathematically called the Inverse Sympletic Fourier Transform (ISFFT). Correspondingly, the transformation from the time-frequency domain to the delay Doppler domain is called the Sympletic Fourier Transform (SFFT). The physical meaning behind it is that the delay and Doppler effect of the signal is actually a linear superposition effect of a series of echoes with different time and frequency offsets after the signal passes through a multi-path channel. In this sense, delay Doppler analysis and time-frequency domain analysis can be obtained by converting the ISSFT and SSFT mentioned above. The conversion relationship can be found in Figure 2 .

[0057] Therefore, the OTFS technology transforms the time-varying multipath channel into a time-invariant two-dimensional delay Doppler domain channel (within a certain duration), thereby directly reflecting the channel delay Doppler response characteristics caused by the geometric characteristics of the relative positions of the reflectors between the transceivers in the wireless link. The advantage is that OTFS eliminates the difficulty of traditional time-frequency domain analysis in tracking time-varying fading characteristics, and instead extracts all the diversity characteristics of the time-frequency domain channel through delay Doppler domain analysis. In actual systems, since the number of delay paths and Doppler frequency shifts of the channel is much smaller than the number of time domain and frequency domain responses of the channel, the channel impulse response matrix represented by the delay Doppler domain is sparse. Using the OTFS technology to analyze the sparse channel matrix in the delay Doppler domain can make the packaging of the reference signal more compact and flexible, which is particularly conducive to supporting large antenna arrays in large-scale MIMO systems.

[0058] The core of OTFS modulation is to define QAM symbols on the delay-Doppler plane, transform them into the time-frequency domain for transmission, and then process them back in the delay-Doppler domain at the receiving end. Therefore, the wireless channel response analysis method in the delay-Doppler domain can be introduced. When a signal passes through a linear time-varying wireless channel, the relationship between the expressions of its channel response in different planes is as follows: Figure 3 shown.

[0059] exist Figure 3 In the SFFT transform formula, the SFFT transform formula is:

[0060] h(τ,v)=∫∫H(t,f)e -j2π(vt-fτ) dτdv (1)

[0061] Correspondingly, the transformation formula of ISFFT is:

[0062] H(t,f)=∫∫h(τ,v)e j2π(vt-fτ )dτdv (2)

[0063] When the signal passes through a linear time-varying channel, let the time domain received signal be r(t), and its corresponding frequency domain received signal be R(f), and we have r(t) can be expressed as follows:

[0064] r(t)=s(t)*h(t)=∫g(t,τ)s(t-τ)dτ (3)

[0065] Depend on Figure 3 The relationship is known,

[0066] g(t,τ)=∫h(v,τ)e j2πvt dv (4)

[0067] Substituting (4) into (3) yields:

[0068] r(t)=∫∫h(v,τ)s(t-τ)e j2πvt dτdv (5)

[0069] Depend on Figure 3 From the relationship shown, the classical Fourier transform theory, and formula (5), we know that

[0070]

[0071] Among them, v represents the delay variable, τ represents the Doppler variable, f represents the frequency variable, and t represents the time variable.

[0072] Equation (6) suggests that the analysis of the delay-Doppler domain in the OTFS system can be achieved by adding an additional signal processing process at the transceiver end based on the existing communication framework based on the time-frequency domain. Moreover, the additional signal processing consists only of Fourier transform, which can be completely implemented by existing hardware without adding new modules. This good compatibility with the existing hardware system greatly facilitates the application of the OTFS system. In the actual system, the OTFS technology can be easily implemented as a pre- and post-processing module of a filtered OFDM system, so it has good compatibility with the multi-carrier system under the New Radio (NR) technology architecture.

[0073] When OTFS is combined with a multi-carrier system, the implementation method of the transmitter is as follows: the QAM symbol containing the information to be sent is carried by a waveform on the delayed Doppler plane, and is converted to a waveform on the time-frequency domain plane in the traditional multi-carrier system through a two-dimensional ISFFT, and then undergoes a symbol-level one-dimensional Inverse Fast Fourier Transform (IFFT) and serial-to-parallel conversion to become a time domain sampling point and send it out. The receiving end of the OTFS system is roughly the inverse process of the transmitting end: after the time domain sampling point is received by the receiver, it is converted to a waveform on the time-frequency domain plane through parallel conversion and a symbol-level one-dimensional Fast Fourier Transform (FFT), and then converted to a waveform on the delayed Doppler domain plane through SFFT, and then the QAM symbol carried by the delayed Doppler domain waveform is processed by the receiver: including channel estimation and equalization, demodulation and decoding, etc. The transceiver processing flow of the OTFS system can be referred to. Figure 4 .exist Figure 4 In the communication system, there are precoder, orthogonal frequency division multiplex (OFDM) modulator, channel, OFDM demodulator and decoder.

[0074] The advantages of OTFS modulation are mainly reflected in the following aspects:

[0075] 1) OTFS modulation converts the time-varying fading channel in the time-frequency domain between transceivers into a deterministic non-fading channel in the delay-Doppler domain. In the delay-Doppler domain, each symbol in a set of information symbols sent at a time experiences the same static channel response and signal-to-noise ratio (SNR).

[0076] 2) The OTFS system uses the delayed Doppler image to resolve the reflectors in the physical channel, and uses the receiving equalizer to coherently combine the energy from different reflection paths, which actually provides a static channel response without fading. Using the above static channel characteristics, the OTFS system does not need to introduce closed-loop channel adaptation like the OFDM system to cope with fast-changing channels, thereby improving the system robustness and reducing the complexity of system design.

[0077] 3) Since the number of delay-Doppler states in the delay-Doppler domain is much smaller than the number of time-frequency states in the time-frequency domain, the channel in the OTFS system can be expressed in a very compact form. The channel estimation overhead of the OTFS system is less and more accurate.

[0078] 4) Another advantage of OTFS is that it can handle extreme Doppler channels. By analyzing the delayed Doppler image under appropriate signal processing parameters, the Doppler characteristics of the channel can be fully presented, which is beneficial for signal analysis and processing in Doppler-sensitive scenarios (such as high-speed mobile and millimeter waves).

[0079] In summary, the channel estimation in the OTFS system adopts the following method: the transmitter maps the pilot pulse to the delayed Doppler domain, and the receiver estimates the channel response h(ν,τ) in the delayed Doppler domain by analyzing the delayed Doppler image of the pilot. Figure 3 The relationship is used to obtain the channel response expression in the time-frequency domain, which is convenient for applying existing techniques in the time-frequency domain to perform signal analysis and processing. The pilot mapping on the delay Doppler plane can be done as follows: Figure 5 Way.

[0080] exist Figure 5 In the example, the sending signal is located at (l p ,k p ) of the single-point pilot 501, the area surrounding it is (2l ν +1)(4k ν +1)-1 protection symbol 502, and MN-(2l ν +1)(4k ν+1). At the receiving end, two offset peaks 504 appear in the guard band of the delay-Doppler domain grid point, which means that in addition to the main path, there are two secondary paths with different delay-Dopplers in the channel. By measuring the amplitude, delay and Doppler parameters of all secondary paths, the delay-Doppler domain expression of the channel is obtained, i.e., h(ν,τ). In order to prevent the data on the received signal grid from contaminating the pilot symbols and causing inaccurate channel estimation, the area of ​​the guard symbol should meet the following conditions:

[0081] l τ ≥τ max MΔf,k ν ≥ν max NΔT (7)

[0082] Among them, τ max and ν max are respectively the maximum delay and the maximum Doppler shift of all the paths of the channel. A plurality of guard symbols 502 surround the single-point pilot 501 to form a guard band. The plurality of guard symbols 502 correspond to blank resource elements.

[0083] like Figure 6 As shown, the receiver converts the received time domain sampling points into QAM symbols in the delayed Doppler domain through the OFDM demodulator and OTFS transformation (SFFT in the figure), and then uses the threshold-based signal power detection to determine the location of the pilot pulse. It is worth noting that because the transmission of the pilot is usually power-boosted, the power of the pilot pulse on the receiver side is much greater than the data power, and from the principle analysis in the background technology, it can be seen that the pilot pulse and the data symbol experience exactly the same fading. Therefore, it is easy to determine the pilot position using power detection. Figure 6 In the channel, pilot detection (Pilot Detection); channel estimation (Channel Estimation).

[0084] Figure 5 The example in corresponds to a single-port scenario, that is, only one set of reference signals needs to be sent. In modern multi-antenna systems, we often use multiple antenna ports to send multi-stream data simultaneously, thereby making full use of the spatial freedom of the antenna to achieve the purpose of obtaining spatial diversity gain or improving system throughput. When multiple antenna ports exist, multiple pilots need to be mapped to the delayed Doppler plane, such as: 24 antenna ports correspond to 24 pilot signals, each of which uses Figure 5 The form is the central impulse signal plus the protection symbols on both sides. The number of delayed Doppler domain REs (resource elements) occupied by a single pilot is (2l τ +1)(4k ν+1). If there are P antenna ports, considering that the guard bands of adjacent antenna ports can be reused, assuming that the pilot is placed in the delay dimension of P1 and in the Doppler dimension of P2, and P = P1P2, then the total resource overhead of the pilot is [P1(l τ +1)+l τ ][P2(2k ν +1)+2k ν ].

[0085] It can be seen that although single-port transmission has the advantages of less resource occupation and simple detection algorithm, for communication systems with multiple antenna ports, the single-point pilot plus guard band scheme cannot reuse resources, which will cause a linear increase in overhead. Therefore, for multi-antenna systems, such as Figure 7 A pilot mapping scheme is proposed.

[0086] exist Figure 7 The pilot does not exist in the form of a single-point pulse, but is a pilot sequence constructed based on a pseudo-random (Persudo Noise, PN) sequence generated in a specific way, and mapped to a two-dimensional resource grid on the delay Doppler plane according to a specific rule. In the following, the resource position occupied by the pilot sequence is called a pilot resource block 701. The part next to the pilot resource block 701 is a pilot guard band 702, which consists of blank resource elements that do not send any signal / data. Similar to Figure 5 In the single-point pilot in the example, a guard band 702 is also provided around the pilot resource block 701 to avoid mutual interference with the data 703. The calculation method of the guard band width is the same as Figure 5 The method is the same as in the single-point pilot mapping mode. The difference is that in the resource part where the pilot sequence is mapped, the pilot sequences of different ports can select low-correlation pilots, overlay and map them on the same resource, and then detect the pilot sequence through a specific algorithm at the receiver end to distinguish the pilots corresponding to different antenna ports. Since full resource reuse is performed at the transmitting end, the pilot overhead in the multi-antenna port system can be greatly reduced.

[0087] Figure 8 The example in presents a detection method based on sequence pilot. Figure 5 In the scenario in Figure 1, at the receiving end, due to the different delays and Doppler shifts of the two paths of the channel, the received pilot signal block is shifted to the first block position 804 and the second block position 805 in the delayed Doppler domain. At this time, the receiving end uses the known transmitted pilot 801 to perform a sliding window detection operation in the delayed Doppler domain. The known sliding window detection operation result M(R,S)[δ,ω] is calculated in N P →+∞, it has the following properties (the probability that the following formula is true approaches 1):

[0088]

[0089] in C>0 is a constant, and decreases with the increase of the signal-to-noise and interference ratio (SINR). The formula can be applied to the merge format. In the formula, (δ, ω) is the current (center point) position of the sliding window, and (δ0, ω0) are the positions to which the pilot signal block (center point) in the received signal is offset. It can be seen from the formula that only when (δ, ω) = (δ0, ω0) can we get a value near 1, otherwise, the result of the sliding window detection operation is a smaller value. Therefore, when the sliding window coincides with the offset pilot signal block, the detection opportunity will calculate an energy peak, which is presented at the (δ0, ω0) position of the delayed Doppler plane. Using this method, as long as N is guaranteed P With sufficient length, the receiver can obtain the correct pilot position according to the value of M(R,S), that is, obtain the delay and Doppler information of the channel. At the same time, the amplitude value of the channel is obtained by the detection operation The value is given.

[0090] Figure 8 Scheme (referred to as pilot sequence) compared Figure 5 The scheme (referred to as pilot pulse) has its own advantages and disadvantages. The advantages of the pilot sequence scheme are: 1) it is conducive to multi-port / multi-user multiplexing; 2) the accuracy of sequence detection can be flexibly adjusted; 3) it saves protection symbol overhead; 4) even if the overhead is insufficient. The disadvantages are: 1) the complexity of sequence correlation / matching detection is high; 2) the accuracy is restricted by the sequence length.

[0091] The advantages of the pilot pulse scheme are: 1) the receiving end only needs to use simple energy detection; 2) the detection success rate can be improved by power boost (i.e. the transmitter increases the transmission power of the pilot signal alone). The disadvantages are: 1) each pilot pulse needs to be set with a separate guard band, which has a large overhead in multi-port transmission.

[0092] The above advantages and disadvantages can summarize the performance of the two schemes in various scenarios. In addition, in some scenarios, the overhead of the pilot protection interval is limited and is not enough to completely cover the possible delay and Doppler shift of the channel. At this time, the pilot sequence scheme still shows acceptable performance, while the pilot pulse scheme has a great performance loss. Fig. 9 As shown, in the special scenario shown in the figure (the channel delay and Doppler shift are large), even if the pilot overhead reaches 60%, the performance of the pilot pulse solution is still far inferior to that of the pilot sequence solution.

[0093] In the delay-Doppler domain, the general method for constructing a pilot (or reference signal) sequence is as follows: First, a base sequence is generated. Then, the base sequence is modulated to generate a pilot sequence. Optionally, OCC may be used on the pilot sequence to further improve orthogonality.

[0094] The base sequence may be a ZC sequence or a PN sequence. Further, the PN sequence includes the following sequences: M sequence, Gold sequence, Kasami sequence, Barker sequence, etc.

[0095] The general process of inserting pilots at the transmitter is as follows: the pilot sequence and data are modulated separately and then placed in the same delay-Doppler resource block. The pilot and data occupy orthogonal resources and are separated by a guard band. The entire delay-Doppler resource block containing the pilot and data is transformed into the time-frequency domain through ISSFT, and then converted into a time-domain signal for transmission through OFDM-like processing.

[0096] 2. Cell-free network.

[0097] In traditional cell-based systems, each cell has a specific coverage area, and the downlink or uplink signal when the UE communicates with the cell is associated with the cell's information (such as cell ID). When the UE moves between different cells, it needs to perform inter-cell handover or cell reselection. UEs at the edge of a cell are usually interfered with by neighboring cells (inter-cell interference).

[0098] The concept of cell free abandons the idea of ​​cell, such as Fig.10 As shown in the figure, the system is composed of many dense access points (APs) or TRPs, and the UE communicates with one or more neighboring APs / TRPs. When the UE moves between different APs, the serving AP of the UE (which can be one AP or multiple APs) will change. In the cell free architecture, there is no concept of cell ID, and there will be no inter-cell handover or cell reselection. Usually, a UE will not be strongly interfered by neighboring APs (because the N APs adjacent to the UE usually serve as the serving APs of the UE).

[0099] On the basis of the above-mentioned cell-free technology, the concept of super cell can be optionally further introduced.

[0100] The network structure of super cell is as follows Fig.11 As shown in FIG. 4 , a super cell can be implemented by multiple TRPs or APs through a single-frequency network (SFN) transmission solution.

[0101] In the SFN transmission mode, multiple TRPs or APs send the same signal. There is no co-channel interference between different TRPs or APs, and multiple signals can improve the signal to interference plus noise ratio (SINR), transmission quality and coverage. Multiple TRPs or APs that make up SFN can share a cell ID, called a super cell ID. Multiple TRPs or APs can send signals through SFN transmission. For example, each TRP or AP sends with a wide beam. At a certain moment, the terminal can receive wide beams sent by multiple TRPs or APs, thereby obtaining diversity gain. In the SFN transmission scheme, the terminal does not need to frequently reselect or switch cells between TRPs or APs.

[0102] One implementation scheme is that the UE performs mobility management or sends and receives small packets through the super cell, and transmits data through one or more adjacent TRPs.

[0103] A core issue of cell free is how to determine which TRPs or APs among many TRPs or APs to dynamically serve terminal users. Currently, the initial access process of the terminal is used to implement TRP selection and attachment.

[0104] 3: Basic process of terminal system access.

[0105] 1. Initial network search: including synchronization of the synchronization signal block (SSB) and reception of system information. Specifically, first receive the primary synchronization signal (PSS), then receive the secondary synchronization signal (SSS), and then receive the physical broadcast channel (PBCH): obtain the SSB index, as well as the information in the PBCH demodulation reference signal (DMRS) and the master information block (MIB).

[0106] 2. Receive the broadcasted system information (SI) based on the information obtained above, which includes the information required for accessing the system.

[0107] 3. Perform random access based on the information required for system access obtained above.

[0108] The above is the initial access process in a single NR base station cell. The UE only receives SSBs from the current cell, and obtains system information by detecting synchronization signals (including PSS and SSS) in the SSB, as well as reference signals (DMRS) and data information (MIB) in the PBCH, so as to conduct further random access by sending uplink messages. In the above process, the pilot signals (PSS and SSS) used for synchronization are tightly coupled with the data part (content in the PBCH) containing system messages.

[0109] The access method of the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0110] See also Fig.12 , Fig.12 The access method of the embodiment of the present application can be executed by a terminal.

[0111] like Fig.12 As shown, the access method provided in the embodiment of the present application may include the following steps:

[0112] Step 1201: The terminal obtains a first delay Doppler domain data set, where the first delay Doppler domain data set is obtained by mapping N pilot signals to resource positions of a first delay Doppler domain resource block, where N is an integer greater than 1.

[0113] In this embodiment, the pilot signal may include but is not limited to a pilot pulse or a pilot sequence. It should be noted that the N pilot signals may be the same or different. When the N pilot signals are the same, the N pilot signals may be respectively mapped to different resource positions of the first delayed Doppler domain resource block, that is, the resource positions are orthogonal; when the N pilot signals are different, the resource positions of the N pilot signals in the first delayed Doppler domain resource block may be partially overlapped, fully overlapped (that is, the resource positions are the same) or orthogonal, and this embodiment does not limit this.

[0114] Specifically, the above-mentioned N pilot signals can correspond to N first network side devices, wherein the above-mentioned N first network side devices can be any one of the following: different TRPs in a cell free network; different TRPs under 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.

[0115] 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 less than or equal to N.

[0116] The P first network-side devices are any of the following:

[0117] P first network-side devices corresponding to P first resource positions, where the P first resource positions are P resource positions where peak values ​​are detected on the first delay-Doppler domain resource block;

[0118] The P first network-side devices correspond to the P first pilot signals, and the P first pilot signals are the P pilot signals whose peak values ​​are detected.

[0119] In this embodiment, the terminal can detect the first delayed Doppler domain data set to obtain a detection result. For example, when the above-mentioned 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; when the above-mentioned 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.

[0120] The detection result may include a peak value of the detected pilot signal, such as an energy peak value or a power peak value, etc. Optionally, the detection result may also 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.

[0121] It should be noted that the above-mentioned P first network side devices may include all of the first network side devices corresponding to all resource locations where peaks are detected; or may include part of the first network side devices corresponding to all resource locations where peaks are detected, for example, only including the first network side device corresponding to the resource location with the largest detected peak, or P first network side devices selected from the first network side devices corresponding to all resource locations where peaks are detected according to the acquired prior information, wherein the above-mentioned prior information may include but is not limited to at least one of the detection threshold, delay threshold, Doppler threshold, the maximum number of network side devices supported by the terminal for simultaneous access, etc.

[0122] In one embodiment, the pilot signal may be mapped to different resource positions of the first delay-Doppler domain resource block, so that different first network side devices may be distinguished based on different resource positions. Specifically, the terminal device may detect each resource position, and if a peak value is detected at a certain resource position, the first network side device corresponding to the resource position may be determined as a candidate network side device for access selection.

[0123] In another embodiment, different pilot signals may be mapped to the same resource position of the first delay Doppler domain resource block, so that different first network side devices may be distinguished based on different pilot signals. Specifically, the terminal device may detect the first delay Doppler domain resource block based on each pilot signal, and if a peak is detected based on 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.

[0124] In another embodiment, different pilot signals may be mapped to different resource positions of the first delay Doppler domain resource block, so that different first network side devices may be distinguished based on different pilot signals, and different first network side devices may be distinguished based on different resource positions. Specifically, the terminal device may detect each resource position of the first delay Doppler domain resource block based on each pilot signal, and if 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.

[0125] The access method of the embodiment of the present application can achieve decoupling of the synchronization signal and system information in the SSB and reduce the resource overhead of the initial access because the terminal can perform access selection based on the pilot signal sent separately by the first network side device. In addition, the pilot signal selected by the first network side device is sent through OTFS technology processing, which can improve the reliability of the selection of the first network side device.

[0126] Optionally, the N pilot signals are: pilot pulses; or pilot sequences.

[0127] In this embodiment, the pilot signal may be a pilot pulse or a pilot sequence. It should be noted that, when the pilot signal is a pilot pulse, the N pilot signals may be the same pilot pulse. When the pilot signal is a pilot sequence, the N pilot signals may be different pilot sequences or the same pilot sequence.

[0128] Optionally, when the N pilot signals are pilot sequences, any one of the following is satisfied:

[0129] 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 the P first network-side devices corresponding to the P first resource positions;

[0130] The resource positions mapped by the N pilot signals are orthogonal or partially overlapped, the N pilot signals are different pilot sequences, and the P first network side devices are the P first network side devices corresponding to the P first resource positions or the P first network side devices corresponding to the P first pilot signals;

[0131] The resource positions mapped to the N pilot signals are the same, the N pilot signals are different pilot sequences, and the P first network-side devices are the P first network-side devices corresponding to the P first pilot signals.

[0132] In this embodiment, the resource positions mapped by the above N pilot signals are orthogonal, which can be understood as the resource positions mapped by the above N pilot signals are completely non-overlapping or different. The resource positions mapped by the above N pilot signals are the same, which can be understood as the resource positions mapped by the above N pilot signals completely overlap. The above N pilot signals are different pilot sequences, which can be understood as the above N pilot signals are orthogonal or quasi-orthogonal.

[0133] In one embodiment, when N pilot signals are the same pilot sequence, the N pilot signals can be mapped to orthogonal resource positions in the first delayed Doppler domain resource block, so that the terminal can distinguish different first network side devices based on the resource positions mapped by the N pilot signals. Accordingly, 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 can be left between the orthogonal resource positions to ensure that orthogonality is still guaranteed at the receiving end after passing through the channel.

[0134] For example, Fig.13 As shown, the N first network-side devices include two TRPs, denoted as TRP_1 and TRP_2. Since TRP_1 and TRP_2 are isolated in space, the channels CH_1 and CH_2 from TRP_1 and TRP_2 to the terminal are independent of each other. TRP_1 and TRP_2 map the pilot signal to orthogonal resource positions on the same delay Doppler domain resource block, that is, the pilot signals sent by the above TRP_1 and TRP_2 on the same delay Doppler domain resource block are orthogonal to each other's resources, and a pilot protection band is left to ensure that orthogonality is still guaranteed on the terminal side after passing through the channel. In actual applications, each TRP can map a pilot signal to its specific resource position, and the remaining other resource positions are left blank as a pilot protection band. It should be noted that the above pilot protection band may only occupy part of the Delay Doppler (DD) domain grid, that is, only part of the DD domain resource block.

[0135] In another embodiment, when the N pilot signals are different pilot sequences, the N pilot signals can be mapped to the same resource position in the first delayed Doppler domain resource block, so that the terminal can distinguish different first network side devices based on the pilot sequence, and accordingly, 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 can be left between the N orthogonal pilot signals to ensure that orthogonality is still guaranteed at the receiving end after passing through the channel.

[0136] For example, Fig.14 As shown, the above-mentioned N first network-side devices include two TRPs, denoted as TRP_1 and TRP_2. The two TRPs send pilot sequences to the same terminal on the same resource block in the delayed Doppler domain. Since TRP_1 and TRP_2 are isolated in space, the channels CH_1 and CH_2 from TRP_1 and TRP_2 to the terminal are independent of each other. The pilot sequences sent by TRP_1 and TRP_2 on the same resource block in the delayed Doppler domain are orthogonal or quasi-orthogonal, and a pilot protection band is left to ensure that orthogonality is still guaranteed on the terminal side after passing through the channel. In actual applications, each TRP can map a pilot sequence to its specific resource position, and the remaining other resource positions are left blank as a pilot protection band. It should be noted that the pilot protection band can occupy only part of the DD domain grid, that is, only part of the DD domain resource block.

[0137] In another embodiment, when the N pilot signals are different pilot sequences, the above-mentioned N pilot signals can be mapped to orthogonal resource positions in the first delayed Doppler domain resource block, so that the terminal can distinguish different first network side devices based on the pilot sequence, and can also distinguish different first network side devices based on the resource position. Accordingly, in this case, the P first network side devices can be the P first network side devices corresponding to the P first resource positions, or can be the P first network side devices corresponding to the P first pilot signals.

[0138] Optionally, when the N pilot signals are pilot pulses, the following conditions are satisfied:

[0139] Time synchronization between the terminal and N first network-side devices corresponding to the N pilot signals;

[0140] The resource positions mapped by the N pilot signals are orthogonal;

[0141] The P first network side devices are P first network side devices corresponding to the P first resource locations.

[0142] In this embodiment, the time synchronization between the terminal and the N first network-side devices may include time synchronization between the N first network-side devices, and time synchronization 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 locations.

[0143] The resource positions of the N pilot signals being mapped are orthogonal, which can be understood as the resource positions of the N pilot signals being mapped are completely non-overlapping or different. Optionally, a pilot guard band can be left between the orthogonal resource positions to ensure orthogonality at the receiving end after passing through the channel.

[0144] Specifically, when the N pilot signals are pilot pulses, the resource positions to which the N pilot signals are mapped are orthogonal. Fig.15 As shown, the N first network side devices include two TRPs, denoted as TRP_1 and TRP_2. Since TRP_1 and TRP_2 are isolated in space, the channels CH_1 and CH_2 from TRP_1 to the terminal are independent of each other. The pilot signals sent by TRP_1 and TRP_2 on the same delay Doppler domain resource block are orthogonal to each other (the pilot resources of the two TRPs are Fig.15 In practical applications, each TRP can map a pilot pulse to its specific resource position, and leave the remaining other resource positions blank as a pilot guard band. It should be noted that the pilot guard band can only occupy part of the DD domain grid, that is, only part of the DD domain resource block.

[0145] In addition, when the N pilot signals are pilot pulses, it is also necessary to ensure time synchronization between the terminal and the N first network side devices corresponding to the N pilot signals. Optionally, before receiving the N groups of time domain sampling points, the method may also include:

[0146] The terminal receives a timing synchronization signal sent by a second network side device, where the timing synchronization signal is used for time synchronization between the terminal and N first network side devices corresponding to the N pilot signals.

[0147] The second network side device may be, for example, a super cell. The time synchronization may be, for example, frame timing synchronization. Specifically, after receiving the timing synchronization signal from the second network side device, the terminal may implement time synchronization with the N first network side devices based on the timing synchronization signal.

[0148] Optionally, this embodiment can decouple the acquisition of the timing synchronization signal in the initial access process and the selection and attachment of the first network side device. For example, the second network side device can send a timing synchronization signal with wide area coverage, which is only used to provide timing synchronization for the terminal, such as frame timing synchronization, so that the terminal can select the first network side device based on the above steps 1201 to 1202 after acquiring the timing synchronization signal.

[0149] Optionally, the terminal accesses P first network-side devices according to the detection result of the first delay-Doppler domain data set, including:

[0150] The terminal detects the first delay-Doppler domain data set according to the first prior information to obtain a detection result;

[0151] The terminal accesses P first network-side devices according to the detection result and the second priori information;

[0152] Wherein, when the pilot signal is a pilot pulse, the first a priori information includes a resource position set on the first delayed Doppler domain resource block to which the pilot signal is mapped; and when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource position set and a pilot sequence set on the first delayed Doppler domain resource block to which the pilot signal is mapped;

[0153] The second prior information includes at least one of the following:

[0154] a target threshold, where the target threshold is used to characterize the channel quality between the terminal and the network side device;

[0155] The terminal supports the maximum number of network-side devices that can access simultaneously.

[0156] In this embodiment, the resource position set on which the pilot signal is mapped on the above-mentioned first delay Doppler domain resource block can indicate the set of delay Doppler (DD) domain sub-areas on which the terminal needs to perform pilot signal detection, so that the terminal can perform pilot signal detection only on each resource position of the above-mentioned resource position set, that is, the terminal only needs to detect a limited number of sampling points, thereby reducing the complexity of detection.

[0157] The pilot sequence set may indicate a set of candidate pilot sequences that may be sent by the first network side device, so that the terminal may only detect the candidate pilot sequences in the pilot sequence set, that is, only a limited number of candidate pilot sequences need to be detected, thereby reducing the complexity of detection.

[0158] The target threshold is used to characterize the channel quality between the terminal and the network side device, that is, it is used by the terminal to measure the channel quality between the terminal and the network side device. Optionally, the target threshold may include at least one of the following: a detection threshold; a delay threshold; a Doppler threshold.

[0159] The above detection threshold may include a signal-to-noise ratio (SNR) threshold, a reference signal receiving power (RSRP) threshold, etc. For example, the terminal may choose to attach to a first network-side device whose SNR value or RSRP value obtained based on the above pilot signal measurement is greater than the above detection threshold. For the above delay threshold, for example, the terminal may choose to attach to a first network-side device whose delay value obtained based on the pilot signal measurement is less than the above delay threshold. For the above Doppler threshold, for example, the terminal may choose to attach to a first network-side device whose Doppler value obtained based on the pilot signal measurement is less than the above Doppler threshold.

[0160] It should be noted that, when the target threshold includes at least two of the detection threshold, the delay threshold and the Doppler threshold, the terminal can select the first network side device based on multiple measurement indicators. For example, when the target threshold includes the detection threshold, the delay threshold and the Doppler threshold, the terminal can choose to attach to the first network side device whose SNR value or RSRP value obtained based on the pilot signal measurement is greater than the above detection threshold, the measured delay value is less than the above delay threshold, and the measured Doppler value is less than the above Doppler threshold.

[0161] The maximum number of network-side devices that the terminal supports to access simultaneously is used to indicate 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 at the same time.

[0162] It should be noted that, no matter 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 network-side devices that the terminal supports to access simultaneously.

[0163] It should also be noted that the first a priori information and the second a priori information may be pre-configured 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 obtained through a broadcast message of a super cell. In addition, 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 through the same message or different messages.

[0164] In an embodiment of the present application, the terminal detects the first delayed Doppler domain data set according to the first prior information to obtain a detection result, which can reduce the complexity of the detection. In addition, the terminal accesses P first network side devices according to the detection result and the second prior information, which can improve the reliability of the first network side device selected for access.

[0165] Optionally, the terminal acquires a first delay-Doppler domain data set, including:

[0166] The terminal receives a time domain sampling point set, where the time domain sampling point set is determined based on N second delay Doppler domain data sets, where each of the second delay Doppler domain data sets is obtained by mapping a pilot signal onto a first delay Doppler domain resource block;

[0167] The terminal recovers a first delay-Doppler domain data set according to the time domain sampling point set.

[0168] In this embodiment, the above-mentioned time domain sampling point set can be a superimposed signal of time domain sampling points sent by N first network side devices. For each time domain sampling point sent by the first network side device, each first network side device can map a pilot signal to a resource position of the first delay Doppler domain resource block to obtain a second delay Doppler domain data set corresponding to the delay Doppler domain resource block; thereafter, the first network side device transforms 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 the time domain sampling points corresponding to the second delay Doppler domain data set.

[0169] Correspondingly, in contrast to the signal processing direction of the first network side device, the terminal can first convert the time domain sampling point set into a time-frequency domain data set, and then perform SFFT transformation on the time-frequency domain data set to recover the first delay Doppler domain data set. It should be noted that the above-mentioned first delay Doppler domain data set is placed on the first delay Doppler domain resource block. In addition, the above-mentioned first delay Doppler domain data set includes the above-mentioned N pilot signals at the resource positions respectively mapped to the first delay Doppler domain resource block.

[0170] See also Fig.16 , Fig.16 The access method of the embodiment of the present application is performed by the first network side device.

[0171] like Fig.16 As shown, the access method provided in the embodiment of the present application may include the following steps:

[0172] Step 1601: The first network side device maps a pilot signal to a resource position of a first delay Doppler domain resource block to obtain a second delay Doppler domain data set.

[0173] In this embodiment, the first pilot signal may be a pilot pulse or a pilot sequence.

[0174] Step 1602: The first network side device sends a time domain sampling point to the terminal, where the time domain sampling point is determined based on the second delay-Doppler domain data set.

[0175] In this embodiment, the first network side device can transform the second delay Doppler domain data set into a time-frequency domain resource set through ISSFT, and further convert the time-frequency domain resource set into time domain sampling points and send them to the terminal.

[0176] In the access method of the embodiment of the present application, the first network side device can send the selected pilot signal separately to the terminal, so as to achieve decoupling of the synchronization signal and system information in the SSB and reduce the resource overhead of the initial access. In addition, the first network side device can process and send the selected pilot signal through the OTFS technology, which can improve the reliability of the selection of the first network side device.

[0177] Optionally, the pilot signal is: a pilot pulse; or a pilot sequence.

[0178] The implementation method of this embodiment can be found in Fig.12 The relevant description of the illustrated embodiment is not repeated here.

[0179] Optionally, when the pilot signal is a pilot pulse, the first network side device and the terminal are time synchronized.

[0180] The implementation method of this embodiment can be found in Fig.12 The relevant description of the illustrated embodiment is not repeated here.

[0181] It should be noted that this embodiment is Fig.12 The embodiments of the network side device corresponding to the method embodiments can therefore be found in Fig.12 The relevant descriptions in the method embodiment can achieve the same beneficial effects. In order to avoid repeated descriptions, they will not be repeated here.

[0182] It should be noted that the various optional implementations introduced in the embodiments of the present application can be implemented in combination with each other or can be implemented separately, and the embodiments of the present application are not limited to this.

[0183] For easier understanding, the following example is used to illustrate:

[0184] Example 1: The pilot pulses are the same, and the TRPs are distinguished by using different pilot pulse mapping positions.

[0185] For example, Fig.15 As shown, the N first network side devices include two TRPs, denoted as TRP_1 and TRP_2. Since TRP_1 and TRP_2 are isolated in space, the channels CH_1 and CH_2 from TRP_1 to the terminal are independent of each other. The pilot signals sent by TRP_1 and TRP_2 on the same delay Doppler domain resource block are orthogonal to each other (the pilot resources of the two TRPs are Fig.15 ), and a pilot protection band is left to ensure orthogonality at the receiving end after passing through the channel. In practical applications, each TRP can map a pilot pulse to its specific resource position, and leave the remaining other resource positions blank, for example, as a pilot protection band. It should be noted that the above-mentioned pilot protection band may only occupy part of the DD domain grid, that is, only part of the DD domain resource block. After completing the mapping of the pilot pulse to the resource position of the delayed Doppler domain resource block, each TRP can transform the delayed Doppler domain symbols to the time-frequency domain through ISSFT, and further convert the time-frequency domain into time domain sampling points and send them out.

[0186] On the receiving side, that is, on 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 sent by TRP_1 after experiencing CH_1 and the signal sent by TRP_2 after experiencing CH_2, which cannot be distinguished in the time-frequency domain. Therefore, the terminal can perform SFFT transformation on the sum signal to restore it to the delayed Doppler domain, and obtain Fig.15 The received signal in the delayed Doppler domain is shown at the bottom. Although the pilot pulse is delayed and Doppler shifted on the delayed Doppler spectrum on the terminal side due to the multipath channel, the pilot protection band is reserved and the size of the pilot protection band can completely cover the maximum delay and Doppler extension of each TRP and the channel between the terminal. Therefore, no matter what kind of delayed Doppler response the pilot pulse experiences in the channel, on the delayed Doppler spectrum on the terminal side, the pilot pulse corresponding to each TRP is always in the specific sub-area where the TRP maps the pilot pulse. This ensures that the terminal can correctly determine the initial area of ​​the pilot pulse mapping through power detection, thereby correctly distinguishing the TRP information indicated by the pilot pulse position.

[0187] Accordingly, the terminal can select a suitable TRP for subsequent uplink or random access processes based on the prior information of the pilot mapping position and in combination with its own signal power measurement of each mapping sub-area (i.e., the specific sub-area of ​​the above-mentioned mapping pilot pulse).

[0188] It should be noted that in this example, the time synchronization between each TRP is carried out, and the time synchronization between the terminal and each TRP is carried out. For the acquisition of time synchronization (for example, frame timing synchronization) of the UE, it can be obtained in advance through other signals sent by the super cell. Optionally, a method different from NR can be used to decouple the acquisition of timing synchronization signals and TRP selection in initial access from attachment. For example, the super cell sends a timing synchronization signal with wide-area coverage, which is only used to provide frame timing synchronization for the terminal. After the UE obtains the timing synchronization signal, it uses the above method to select the TRP.

[0189] In order to reduce the complexity of terminal detection, the terminal can obtain prior information about the pilot configuration, which can be pre-configured by the protocol or obtained by the super cell broadcast message. Specifically, the prior information of the pilot configuration, that is, the pilot configuration information, can include at least one of the fields shown in Table 1.

[0190] Table 1 Pilot configuration information

[0191] Measurement threshold Maximum number of TRP connections Pilot mapping position set ...

[0192] In Table 1, the above measurement threshold is the above target threshold. For details, please refer to the relevant description of the above target threshold, which will not be elaborated here.

[0193] The above-mentioned maximum number of TRP connections is also the maximum number of network-side devices that the above-mentioned terminal supports to access simultaneously. For specific details, please refer to the relevant instructions on the maximum number of network-side devices that the above-mentioned terminal supports to access simultaneously, which will not be repeated here.

[0194] The above-mentioned pilot mapping position set, that is, the resource position set for mapping the pilot signal on the above-mentioned first delayed Doppler domain resource block, can be found in the relevant description of the resource position set for mapping the pilot signal on the above-mentioned first delayed Doppler domain resource block, and will not be repeated here.

[0195] Optionally, the pilot configuration information may also include some common configuration parameters that are irrelevant to the delay Doppler domain, such as information such as the pilot period, the frequency band where the pilot is located, and the measurement window configuration.

[0196] Example 2: The pilot sequences are the same, and the TRPs are distinguished by using different pilot sequence mapping positions.

[0197] For example, Fig.13As shown, the N first network-side devices include two TRPs, denoted as TRP_1 and TRP_2. Since TRP_1 and TRP_2 are isolated in space, the channels CH_1 and CH_2 from TRP_1 and TRP_2 to the terminal are independent of each other. TRP_1 and TRP_2 map the pilot sequence to orthogonal resource positions on the same delayed Doppler domain resource block, that is, the pilot sequences sent by the above TRP_1 and TRP_2 on the same delayed Doppler domain resource block are orthogonal to each other's resources, and a pilot protection band is left to ensure that orthogonality is still guaranteed on the terminal side after passing through the channel. Each TRP can map a pilot signal to its specific resource position, and the remaining other resource positions are left blank, for example, as a pilot protection band. It should be noted that the above pilot protection band may occupy only part of the DD domain grid. After the above TRP_1 and TRP_2 complete the mapping of the pilot sequence to the delayed Doppler domain resource block, each TRP transforms the delayed Doppler domain symbols to the time-frequency domain through ISSFT, and further converts the time-frequency domain into time domain sampling points and sends them out.

[0198] On the receiving side, that is, on 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 sent by TRP_1 after experiencing CH_1 and the signal sent by TRP_2 after experiencing 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 Fig.13 The received signal in the delayed Doppler domain is shown at the bottom. Although the pilot is delayed and Doppler shifted on the delayed Doppler spectrum of the terminal due to the multipath channel, the pilot protection band is reserved, and the size of the pilot protection band can completely cover the maximum delay and Doppler extension of each TRP and the channel between the terminal. Therefore, no matter what kind of delayed Doppler response the pilot has experienced in the channel, on the delayed Doppler spectrum on the terminal side, the pilot sequence corresponding to each TRP is always in the specific sub-area where the TRP maps the pilot sequence. This ensures that the terminal can correctly determine the initial area of ​​the pilot sequence mapping through pilot sequence detection, thereby correctly distinguishing the TRP information indicated by the pilot sequence position.

[0199] Accordingly, the terminal can select a suitable TRP for subsequent uplink access procedures through the prior information of the pilot mapping position combined with its own signal power measurement of each mapping sub-area (ie, the specific sub-area of ​​the above-mentioned mapping pilot sequence).

[0200] It should be noted that in this example, advance time synchronization between TRPs is not required. The UE can obtain time synchronization through detection based on the delayed Doppler domain sequence.

[0201] In order to reduce the complexity of terminal detection, the terminal can obtain prior information about the pilot configuration, which can be pre-configured by the protocol or obtained by the super cell broadcast message. Specifically, the prior information of the pilot configuration, that is, the pilot configuration information, can include at least one of the fields shown in Table 2.

[0202] Table 2 Pilot configuration information

[0203] Measurement threshold Maximum number of TRP connections Pilot mapping position set …

[0204] In Table 2, the above measurement threshold is the above target threshold. For details, please refer to the relevant description of the above target threshold, which will not be elaborated here.

[0205] The above-mentioned maximum number of TRP connections is also the maximum number of network-side devices that the above-mentioned terminal supports to access simultaneously. For specific details, please refer to the relevant instructions on the maximum number of network-side devices that the above-mentioned terminal supports to access simultaneously, which will not be repeated here.

[0206] The above-mentioned pilot mapping position set, that is, the resource position set for mapping the pilot signal on the above-mentioned first delayed Doppler domain resource block, can be found in the relevant description of the resource position set for mapping the pilot signal on the above-mentioned first delayed Doppler domain resource block, and will not be repeated here.

[0207] Optionally, the pilot configuration information may also include some common configuration parameters that are irrelevant to the delay Doppler domain, such as information such as the pilot period, the frequency band where the pilot is located, and the measurement window configuration.

[0208] Example 3: The pilot sequence mapping positions are the same, and different pilot sequences are used to distinguish TRPs.

[0209] For example, Fig.14 As shown, the above-mentioned N first network-side devices include two TRPs, denoted as TRP_1 and TRP_2. The two TRPs send pilot sequences to the same terminal on the same resource block in the delay Doppler domain. Since TRP_1 and TRP_2 are isolated in space, the channels CH_1 and CH_2 from TRP_1 and TRP_2 to the terminal are independent of each other. The pilot sequences sent by TRP_1 and TRP_2 on the same resource block in the delay Doppler domain are orthogonal or quasi-orthogonal, and a pilot protection band is reserved to ensure that orthogonality is still guaranteed on the terminal side after passing through the channel. Fig.14As shown, each TRP maps the pilot sequence to its own specific resource position, and leaves the remaining other resource positions empty, for example, as a pilot guard band. It should be noted that the pilot guard band may only occupy 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 to the time-frequency domain through ISSFT, and further convert the time-frequency domain into time domain sampling points and send them out.

[0210] On the receiving side, that is, 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 sent by TRP_1 after experiencing CH_1 and the signal sent by TRP_2 after experiencing CH_2, which cannot be distinguished in the time-frequency domain. Therefore, the terminal can perform SFFT transformation on the sum signal to restore it to the delayed Doppler domain, and obtain Fig.14 The received signal in the delay Doppler domain is shown at the bottom. Under the influence of the multipath channel, the pilot sequence is delayed and Doppler shifted on the delay Doppler spectrum on the terminal side. The terminal can use the known pilot sequence to perform multiple pilot sequence detections on the received samples. When the transmitted signal contains a pilot sequence corresponding to a specific TRP, when the terminal selects the pilot for detection, it can observe a peak on the delay Doppler spectrum obtained by the detection algorithm (the peak cannot be observed using other pilot detections), so that the TRP information indicated by the pilot sequence can be correctly distinguished.

[0211] Accordingly, the terminal can select a suitable TRP for subsequent uplink access procedures through the prior information of the pilot mapping position combined with its own signal power measurement of each mapping sub-area.

[0212] It should be noted that in this example, advance time synchronization between TRPs is not required. The UE can obtain time synchronization through detection based on the delayed Doppler domain sequence.

[0213] In order to reduce the complexity of terminal detection, the terminal can obtain prior information about the pilot configuration, which can be pre-configured by the protocol or obtained by the super cell broadcast message. Specifically, the prior information of the pilot configuration, that is, the pilot configuration information, can include at least one of the fields shown in Table 2.

[0214] Table 3 Pilot configuration information

[0215] Measurement threshold Maximum number of TRP connections Pilot sequence set …

[0216] In Table 3, the above measurement threshold is the above target threshold. For details, please refer to the relevant description of the above target threshold, which will not be elaborated here.

[0217] The above-mentioned maximum number of TRP connections is also the maximum number of network-side devices that the above-mentioned terminal supports to access simultaneously. For specific details, please refer to the relevant instructions on the maximum number of network-side devices that the above-mentioned terminal supports to access simultaneously, which will not be repeated here.

[0218] For the above-mentioned pilot sequence set, reference may be made to the above-mentioned related description of the pilot sequence set, which will not be elaborated here.

[0219] Optionally, the pilot configuration information may also include some common configuration parameters that are irrelevant to the delay Doppler domain, such as information such as the pilot period, the frequency band where the pilot is located, and the measurement window configuration.

[0220] Example 4: Different pilot sequences and mapping positions are used to distinguish TRPs.

[0221] In this example, different pilot sequences can be understood as pilots used by different TRPs being orthogonal or quasi-orthogonal to each other. Different pilot mapping positions can be understood as pilot signals of different TRPs occupying different resources on delayed Doppler domain resource blocks. For example, pilot signals of different TRPs occupy orthogonal resources on delayed Doppler domain resource blocks, i.e., the resources occupied by pilots used by different TRPs do not overlap; or the resources occupied by pilots used by different TRPs partially overlap.

[0222] It should be noted that the related processing of the sending side and the receiving side can refer to the related description of Example 3, which will not be repeated here. In addition, the prior information of the pilot configuration in this example may include at least one of the fields shown in Table 4.

[0223] Table 4 Pilot configuration information

[0224] Measurement threshold Maximum number of TRP connections Pilot sequence set Pilot mapping position set

[0225] In Table 4, the above measurement threshold is the above target threshold. For details, please refer to the relevant description of the above target threshold, which will not be elaborated here.

[0226] The above-mentioned maximum number of TRP connections is also the maximum number of network-side devices that the above-mentioned terminal supports to access simultaneously. For specific details, please refer to the relevant instructions on the maximum number of network-side devices that the above-mentioned terminal supports to access simultaneously, which will not be repeated here.

[0227] For the above-mentioned pilot sequence set, reference may be made to the above-mentioned related description of the pilot sequence set, which will not be elaborated here.

[0228] The above-mentioned pilot mapping position set, that is, the resource position set for mapping the pilot signal on the above-mentioned first delayed Doppler domain resource block, can be found in the relevant description of the resource position set for mapping the pilot signal on the above-mentioned first delayed Doppler domain resource block, and will not be repeated here.

[0229] Optionally, the pilot configuration information may also include some common configuration parameters that are irrelevant to the delay Doppler domain, such as information such as the pilot period, the frequency band where the pilot is located, and the measurement window configuration.

[0230] It should be noted that the access method provided in the embodiment of the present application may be executed by an access device, or a control module in the access device for executing the access method. In the embodiment of the present application, the access device provided in the embodiment of the present application is described by taking the access method executed by the access device as an example.

[0231] See also Fig.17 , Fig.17 It is a structural diagram of the access device provided in an embodiment of the present application.

[0232] like Fig.17 As shown, the access device 1700 includes:

[0233] An acquisition module 1701 is configured to acquire, by a terminal, a first delay Doppler domain data set, where the first delay Doppler domain data set is obtained by mapping N pilot signals to a resource position of a first delay Doppler domain resource block, where N is an integer greater than 1;

[0234] Access module 1702, configured for 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 less than or equal to N;

[0235] The P first network-side devices are any of the following:

[0236] P first network-side devices corresponding to P first resource positions, where the P first resource positions are P resource positions where peak values ​​are detected on the first delay-Doppler domain resource block;

[0237] The P first network-side devices correspond to the P first pilot signals, and the P first pilot signals are the P pilot signals whose peak values ​​are detected.

[0238] Optionally, the N pilot signals are: pilot pulses; or pilot sequences.

[0239] Optionally, when the N pilot signals are pilot sequences, any one of the following is satisfied:

[0240] 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 the P first network-side devices corresponding to the P first resource positions;

[0241] The resource positions mapped by the N pilot signals are orthogonal or partially overlapped, the N pilot signals are different pilot sequences, and the P first network side devices are the P first network side devices corresponding to the P first resource positions or the P first network side devices corresponding to the P first pilot signals;

[0242] The resource positions mapped to the N pilot signals are the same, the N pilot signals are different pilot sequences, and the P first network-side devices are the P first network-side devices corresponding to the P first pilot signals.

[0243] Optionally, when the N pilot signals are pilot pulses, the following conditions are satisfied:

[0244] Time synchronization between the terminal and N first network-side devices corresponding to the N pilot signals;

[0245] The resource positions mapped by the N pilot signals are orthogonal;

[0246] The P first network side devices are P first network side devices corresponding to the P first resource locations.

[0247] Optionally, the access module includes:

[0248] A detection unit, configured for the terminal to detect the first delay Doppler domain data set according to the first prior information to obtain a detection result;

[0249] An access unit, configured for the terminal to access P first network-side devices according to the detection result and the second priori information;

[0250] Wherein, when the pilot signal is a pilot pulse, the first a priori information includes a resource position set on the first delayed Doppler domain resource block to which the pilot signal is mapped; and when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource position set and a pilot sequence set on the first delayed Doppler domain resource block to which the pilot signal is mapped;

[0251] The second prior information includes at least one of the following:

[0252] a target threshold, where the target threshold is used to characterize the channel quality between the terminal and the network side device;

[0253] The terminal supports the maximum number of network-side devices that can access simultaneously.

[0254] Optionally, the target threshold includes at least one of the following: a detection threshold; a delay threshold; and a Doppler threshold.

[0255] Optionally, the acquisition module includes:

[0256] A receiving unit, configured for the terminal to receive a time domain sampling point set, where the time domain sampling point set is determined based on N second delay Doppler domain data sets, where each of the second delay Doppler domain data sets is obtained by mapping a pilot signal onto a first delay Doppler domain resource block;

[0257] A recovery unit is used for the terminal to recover a first delay Doppler domain data set according to the time domain sampling point set.

[0258] The access device in the embodiment of the present application may be a device, or a component in a terminal, a circuit, or a chip. The device may be a mobile terminal or a non-mobile terminal. For example, the mobile terminal may include but is not limited to the types of terminals 11 listed above, and the non-mobile terminal may be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which are not specifically limited in the embodiment of the present application.

[0259] The access device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0260] The access device 1700 provided in the embodiment of the present application can realize Fig.12 The various processes implemented in the method embodiment achieve the same technical effect and will not be described again here to avoid repetition.

[0261] It should be noted that the access method provided in the embodiment of the present application may be executed by an access device, or a control module in the access device for executing the access method. In the embodiment of the present application, the access device provided in the embodiment of the present application is described by taking the access method executed by the access device as an example.

[0262] See also Fig.18 , Fig.18 It is a structural diagram of the access device provided in an embodiment of the present application.

[0263] like Fig.18 As shown, the access device 1800 includes:

[0264] Mapping module 1801, configured for a first network side device to map a pilot signal to a resource position of a first delay Doppler domain resource block to obtain a second delay Doppler domain data set;

[0265] The sending module 1802 is configured to enable the first network side device to send a time domain sampling point to a terminal, where the time domain sampling point is determined based on the second delay-Doppler domain data set.

[0266] Optionally, the pilot signal is: a pilot pulse; or a pilot sequence.

[0267] Optionally, when the pilot signal is a pilot pulse, the first network side device and the terminal are time synchronized.

[0268] The access device in the embodiment of the present application may be a device, or a component, integrated circuit, or chip in a network side device. The network side device may include but is not limited to the types of network side devices 12 listed above, and the embodiment of the present application does not specifically limit it.

[0269] The access device 1800 provided in the embodiment of the present application can realize Fig.16 The various processes implemented in the method embodiment achieve the same technical effect and will not be described again here to avoid repetition.

[0270] Optional, such as Fig.19 As shown, the embodiment of the present application also provides a communication device 1900, including a processor 1901, a memory 1902, and a program or instruction stored in the memory 1902 and executable on the processor 1901. For example, when the communication device 1900 is a terminal, the program or instruction is executed by the processor 1901 to implement the above Fig.12 When the communication device 1900 is a network side device, the program or instruction is executed by the processor 1901 to implement the above Fig.16 The various processes of the method embodiments can achieve the same technical effect, and will not be described again here to avoid repetition.

[0271] Fig. 20 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0272] The terminal 2000 includes but is 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 and other components.

[0273] Those skilled in the art will appreciate that the terminal 2000 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 2010 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig. 20The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0274] It should be understood that in the embodiment of the present application, the input unit 2004 may include a graphics processor (Graphics Processing Unit, GPU) 20041 and a microphone 20042, and the graphics processor 20041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 2006 may include a display panel 20061, and the display panel 20061 may be configured 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. Other input devices 20072 may include, but are not limited to, a physical keyboard, function keys (such as a volume control button, a switch button, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0275] In the embodiment of the present application, the radio frequency unit 2001 receives downlink data from the network side device and sends it to the processor 2010 for processing; in addition, the uplink data is sent to the network side device. Generally, the radio frequency unit 2001 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0276] The memory 2009 can be used to store software programs or instructions and various data. The memory 2009 can mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area can store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 2009 can include a high-speed random access memory, and can also include a non-volatile memory, wherein the non-volatile memory can 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 disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0277] The processor 2010 may include one or more processing units; optionally, the processor 2010 may be integrated into an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs or instructions, and the modem processor mainly processes wireless communications, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 2010.

[0278] The processor 210 is configured to obtain, by the terminal, a first delay Doppler domain data set, where the first delay Doppler domain data set is obtained by mapping N pilot signals to resource positions of a first delay Doppler domain resource block, where N is an integer greater than 1;

[0279] The radio frequency unit 2001 is configured for 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 less than or equal to N;

[0280] The P first network-side devices are any of the following:

[0281] P first network-side devices corresponding to P first resource positions, where the P first resource positions are P resource positions where peak values ​​are detected on the first delay-Doppler domain resource block;

[0282] The P first network-side devices correspond to the P first pilot signals, and the P first pilot signals are the P pilot signals whose peak values ​​are detected.

[0283] Optionally, the N pilot signals are: pilot pulses; or pilot sequences.

[0284] Optionally, when the N pilot signals are pilot sequences, any one of the following is satisfied:

[0285] 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 the P first network-side devices corresponding to the P first resource positions;

[0286] The resource positions mapped by the N pilot signals are orthogonal or partially overlapped, the N pilot signals are different pilot sequences, and the P first network side devices are the P first network side devices corresponding to the P first resource positions or the P first network side devices corresponding to the P first pilot signals;

[0287] The resource positions mapped to the N pilot signals are the same, the N pilot signals are different pilot sequences, and the P first network-side devices are the P first network-side devices corresponding to the P first pilot signals.

[0288] Optionally, when the N pilot signals are pilot pulses, the following conditions are satisfied:

[0289] Time synchronization between the terminal and N first network-side devices corresponding to the N pilot signals;

[0290] The resource positions mapped by the N pilot signals are orthogonal;

[0291] The P first network side devices are P first network side devices corresponding to the P first resource locations.

[0292] Optionally, the radio frequency unit 2001 is further configured to:

[0293] The terminal detects the first delay-Doppler domain data set according to the first prior information to obtain a detection result;

[0294] The terminal accesses P first network-side devices according to the detection result and the second priori information;

[0295] Wherein, when the pilot signal is a pilot pulse, the first a priori information includes a resource position set on the first delayed Doppler domain resource block to which the pilot signal is mapped; and when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource position set and a pilot sequence set on the first delayed Doppler domain resource block to which the pilot signal is mapped;

[0296] The second prior information includes at least one of the following:

[0297] a target threshold, where the target threshold is used to characterize the channel quality between the terminal and the network side device;

[0298] The terminal supports the maximum number of network-side devices that can access simultaneously.

[0299] Optionally, the target threshold includes at least one of the following: a detection threshold; a delay threshold; and a Doppler threshold.

[0300] Optionally, the radio frequency unit 2001 is further configured to receive, by the terminal, a time domain sampling point set, where the time domain sampling point set is determined based on N second delay Doppler domain data sets, and each of the second delay Doppler domain data sets is obtained by mapping a pilot signal onto a first delay Doppler domain resource block;

[0301] The processor 2010 is further configured to enable the terminal to recover a first delay-Doppler domain data set according to the time domain sampling point set.

[0302] It should be noted that, in this embodiment, the terminal 2000 can implement the embodiment of the present application. Fig.12Each process in the method embodiment achieves the same beneficial effect, and will not be described again here to avoid repetition.

[0303] Specifically, the embodiment of the present application also provides a network side device. Fig.21 As shown, 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 sends the received information to the baseband device 213 for processing. In the downlink direction, the baseband device 213 processes the information to be sent and sends it to the radio frequency device 212, and the radio frequency device 212 processes the received information and sends it out through the antenna 211.

[0304] The frequency band processing device may be located in the baseband device 213 . The method executed by the network-side device in the above embodiment may be implemented in the baseband device 213 . The baseband device 213 includes a processor 214 and a memory 215 .

[0305] The baseband device 213 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig.21 As shown, one of the chips is, for example, a processor 214, which is connected to a memory 215 to call a program in the memory 215 to execute the network device operations shown in the above method embodiment.

[0306] The baseband device 213 may further include a network interface 216 for exchanging information with the radio frequency device 212 , and the interface may be, for example, a common public radio interface (CPRI).

[0307] Specifically, the network side device of the embodiment of the present application further includes: instructions or programs stored in the memory 215 and executable on the processor 214, and the processor 214 calls the instructions or programs in the memory 215 to execute. Fig.16 Each process in the method embodiment achieves the same technical effect and will not be described here to avoid repetition.

[0308] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, each process of the above-mentioned access method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0309] The embodiment of the present application also provides a readable storage medium on which a program or instruction is stored. When the program or instruction is executed by a processor, the above Fig.12 or Fig.16 The various processes of the method embodiments can achieve the same technical effect, and will not be described again here to avoid repetition.

[0310] 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.

[0311] The present application also provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a network side device program or instruction to implement the above Fig.12 or Fig.16 The various processes of the method embodiments can achieve the same technical effect, and will not be described again here to avoid repetition.

[0312] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0313] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0314] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, 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 (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0315] The above-mentioned drawings are used to describe the embodiments of the present application, but the present application is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. An access method, characterized in that: The method comprises: The terminal obtains a first delay Doppler domain data set, where the first delay Doppler domain data set is obtained by mapping N pilot signals to resource positions 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 less than or equal to N; The P first network-side devices are any of the following: P first network-side devices corresponding to P first resource positions, where the P first resource positions are P resource positions where peak values ​​are detected on the first delay-Doppler domain resource block; The P first network-side devices correspond to the P first pilot signals, and the P first pilot signals are the P pilot signals whose peak values ​​are detected.

2. The method according to claim 1, characterized in that The N pilot signals are: pilot pulses; or pilot sequences.

3. The method according to claim 2, characterized in that When the N pilot signals are pilot sequences, any of the following conditions is met: 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 the P first network-side devices corresponding to the P first resource positions; The resource positions mapped by the N pilot signals are orthogonal or partially overlapped, the N pilot signals are different pilot sequences, and the P first network side devices are the P first network side devices corresponding to the P first resource positions or the P first network side devices corresponding to the P first pilot signals; The resource positions mapped to the N pilot signals are the same, the N pilot signals are different pilot sequences, and the P first network-side devices are the P first network-side devices corresponding to the P first pilot signals.

4. The method according to claim 2, characterized in that: When the N pilot signals are pilot pulses, the following conditions are satisfied: Time synchronization between the terminal and N first network-side devices corresponding to the N pilot signals; The resource positions mapped by the N pilot signals are orthogonal; The P first network side devices are P first network side devices corresponding to the P first resource locations.

5. The method according to claim 1, characterized in that The terminal accesses P first network-side devices according to the detection result of the first delay-Doppler domain data set, including: The terminal detects the first delay-Doppler domain data set according to the first prior information to obtain a detection result; The terminal accesses P first network-side devices according to the detection result and the second priori information; Wherein, when the pilot signal is a pilot pulse, the first a priori information includes a resource position set on the first delayed Doppler domain resource block to which the pilot signal is mapped; and when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource position set and a pilot sequence set on the first delayed Doppler domain resource block to which the pilot signal is mapped; The second prior information includes at least one of the following: a target threshold, where the target threshold is used to characterize the channel quality between the terminal and the network side device; The terminal supports the maximum number of network-side devices that can access simultaneously.

6. The method according to claim 5, characterized in that The target threshold includes at least one of the following: a detection threshold; a delay threshold; and a Doppler threshold.

7. The method according to claim 1, characterized in that The terminal acquires a first delay-Doppler domain data set, including: The terminal receives a time domain sampling point set, where the time domain sampling point set is determined based on N second delay Doppler domain data sets, where each of the second delay Doppler domain data sets is obtained by mapping a pilot signal onto a first delay Doppler domain resource block; The terminal recovers a first delay-Doppler domain data set according to the time domain sampling point set.

8. An access device, characterized in that: The access device comprises: An acquisition module, configured to acquire, by a terminal, a first delay Doppler domain data set, wherein the first delay Doppler domain data set is obtained by mapping N pilot signals to a resource position of a first delay Doppler domain resource block, where N is an integer greater than 1; An access module, configured for 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 less than or equal to N; The P first network-side devices are any of the following: P first network-side devices corresponding to P first resource positions, where the P first resource positions are P resource positions where peak values ​​are detected on the first delay-Doppler domain resource block; The P first network-side devices correspond to the P first pilot signals, and the P first pilot signals are the P pilot signals whose peak values ​​are detected.

9. The access device according to claim 8, characterized in that: The N pilot signals are: pilot pulses; or pilot sequences.

10. The access device according to claim 9, characterized in that: When the N pilot signals are pilot sequences, any of the following conditions is met: 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 the P first network-side devices corresponding to the P first resource positions; The resource positions mapped by the N pilot signals are orthogonal or partially overlapped, the N pilot signals are different pilot sequences, and the P first network side devices are the P first network side devices corresponding to the P first resource positions or the P first network side devices corresponding to the P first pilot signals; The resource positions mapped to the N pilot signals are the same, the N pilot signals are different pilot sequences, and the P first network-side devices are the P first network-side devices corresponding to the P first pilot signals.

11. The access device according to claim 9, characterized in that: When the N pilot signals are pilot pulses, the following conditions are satisfied: Time synchronization between the terminal and N first network-side devices corresponding to the N pilot signals; The resource positions mapped by the N pilot signals are orthogonal; The P first network side devices are P first network side devices corresponding to the P first resource locations.

12. The access device according to claim 8, characterized in that: The access module comprises: A detection unit, configured for the terminal to detect the first delay Doppler domain data set according to the first prior information to obtain a detection result; An access unit, configured for the terminal to access P first network-side devices according to the detection result and the second priori information; Wherein, when the pilot signal is a pilot pulse, the first a priori information includes a resource position set on the first delayed Doppler domain resource block to which the pilot signal is mapped; and when the pilot signal is a pilot sequence, the first a priori information includes at least one of a resource position set and a pilot sequence set on the first delayed Doppler domain resource block to which the pilot signal is mapped; The second prior information includes at least one of the following: a target threshold, where the target threshold is used to characterize the channel quality between the terminal and the network side device; The terminal supports the maximum number of network-side devices that can access simultaneously.

13. The access device according to claim 12, characterized in that: The target threshold includes at least one of the following: a detection threshold; a delay threshold; and a Doppler threshold.

14. The access device according to claim 8, characterized in that: The acquisition module comprises: A receiving unit, configured for the terminal to receive a time domain sampling point set, where the time domain sampling point set is determined based on N second delay Doppler domain data sets, where each of the second delay Doppler domain data sets is obtained by mapping a pilot signal onto a first delay Doppler domain resource block; A recovery unit is used for the terminal to recover a first delay Doppler domain data set according to the time domain sampling point set.

15. A communication device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the access method as claimed in any one of claims 1 to 7.

16. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by the processor, the steps of the access method according to any one of claims 1 to 7 are implemented.

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