A communication method and apparatus

Abstract

The application relates to a communication method and device. A first root is determined, wherein when a frequency offset of an LP-SS corresponding to the first root is less than or equal to a first value, an equivalent time domain offset of the LP-SS is greater than a first threshold. A first LP-SS is sent or received, the first LP-SS being determined according to a first ZC sequence, and the first ZC sequence being determined according to the first root. Due to the first root satisfying the characteristic, among the correlation peaks corresponding to the first LP-SS, the correlation peak corresponding to the real signal can fall within the range of a detection window, so that the signal receiving end can successfully demodulate, the demodulation success rate of the first LP-SS is improved, and the time-frequency synchronization performance is improved.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a communication method and apparatus. Background Technology

[0002] In wireless communication systems, the ZC (Zadoff-Chu) sequence is a commonly used sequence. The ZC sequence can be used to generate synchronization signals or reference signals in the communication system.

[0003] For signals generated from ZC sequences, the receiver can use a coherent receiver for demodulation. This coherent receiver samples the received signal and correlates the sampled result with the local ZC sequence to obtain the demodulation result based on the position of the correlation peak. Some low-cost, low-power coherent receivers exist in the network, but these use crystal oscillators with lower precision. Using such crystals for down-conversion and demodulation may introduce frequency shifts. If a frequency shift is introduced into the ZC sequence, it may cause a shift in the time-domain position of the correlation peak, potentially leading to coherent demodulation failure. Summary of the Invention

[0004] This application provides a communication method and apparatus for improving the demodulation success rate of signals.

[0005] Firstly, a first communication method is provided, which is applied to a first device. The first device is, for example, a terminal-side device, which can be understood as a terminal device. That is, the method can be executed by the terminal device, or by other devices including terminal device functions, or by a chip system (or chip) or other functional module capable of implementing the functions of the terminal device, such as being disposed within the terminal device. Alternatively, the first device is, for example, a network-side device, which can be understood as a network device. That is, the method can be executed by a network device, or by other devices including network device functions, or by a chip system (or chip) or other functional module capable of implementing the functions of the network device, such as being disposed within the network device. Hereinafter, the method being executed by a network device is taken as an example. This network device includes, for example, access network equipment, such as a base station. The method includes: determining a first root, wherein when the frequency offset of the LP-SS corresponding to the first root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS is greater than a first threshold (or, when the frequency offset of the ZC sequence corresponding to the first root is less than or equal to the first value, the equivalent time-domain offset of the ZC sequence is greater than the first threshold); transmitting or receiving a first LP-SS, the first LP-SS being determined based on a first ZC sequence (or, the first LP-SS corresponding to a first ZC sequence), the first ZC sequence being determined based on the first root (or, the first ZC sequence corresponding to the first root).

[0006] This application embodiment considers that the time-domain offset of the correlation peak is related to the root of the ZC sequence, and the root of the ZC sequence may affect the position of the correlation peak. Therefore, this application embodiment can select a suitable root for signals using the ZC sequence. For example, for a first LP-SS, a first root can be selected. The first root satisfies the following condition: when the frequency offset of the LP-SS corresponding to the first root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS is greater than a first threshold. This can be understood as follows: if the ZC sequence using the first root has a frequency offset, the resulting time-domain offset will be larger. When the receiver of the first LP-SS performs coherent demodulation on the first LP-SS, although multiple correlation peaks may be obtained, due to the characteristics of the first root, the time-domain interval of each correlation peak is large. For example, only the correlation peak corresponding to the real signal may fall within the detection window range. Therefore, the signal receiver can demodulate successfully, improving the demodulation success rate of the first LP-SS and also improving the time-frequency synchronization performance.

[0007] In one optional implementation, the first root belongs to a first root set, wherein any one of at least one root in the first root set satisfies the following: when the frequency offset of the LP-SS corresponding to the any one root is less than or equal to the first value, the equivalent time-domain offset of the LP-SS is greater than the first threshold; or satisfies the following: when the frequency offset of the ZC sequence corresponding to the any one root is less than or equal to the first value, the equivalent time-domain offset of the ZC sequence is greater than the first threshold. It can be understood that the at least one root in the first root set can be applied to LP-SS. The at least one root may be, for example, some or all of the roots included in the first root set.

[0008] In one optional implementation, the first root set further includes a second root, which satisfies the following conditions: when the frequency offset of the LP-WUS corresponding to the second root is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold; or it satisfies the following condition: when the frequency offset of the ZC sequence corresponding to the second root is less than or equal to the second value, the equivalent time-domain offset of the ZC sequence is less than or equal to the second threshold. The first root set may include only roots applicable to LP-SS, or it may include other roots. For example, the first root set may also include a second root, for example, applicable to LP-WUS. That is, the first root set can be implemented in various ways.

[0009] In one optional implementation, the first root set satisfies one or more of the following: when the length of the first ZC sequence is 23, the first root set includes at least one of 5, 7, 9, and 14; when the length of the first ZC sequence is 29, the first root set includes at least one of 5, 6, 7, 8, 12, and 17; when the length of the first ZC sequence is 31, the first root set includes at least one of 5, 6, 12, 13, 18, and 19; when the length of the first ZC sequence is 53, the first root set includes at least one of 5, 6, 12, 16, 24, and 29; when the length of the first ZC sequence is 59, the first root set includes at least one of 5, 6, 16, 18, 27, and 32; when the length of the first ZC sequence is 61, the first root set includes at least one of 5, 11, 22, 28, 33, and 39; or, when the length of the first ZC sequence is 127, the first root set includes at least one of 5, 11, 22, 33, 37, and 44. The first root set is given the roots that can be included. Optionally, the first root set may include other roots in addition to these, without restriction.

[0010] In one alternative implementation, the first root is determined based on first signaling from the network device; the first root is determined from a first root set based on the identifier of a first cell, where the first cell is the cell transmitting the first LP-SS; or, the first root is determined from the first root set based on the index of a first time unit, where the first time unit is the time unit for transmitting the first LP-SS. Both the signal transmitter and the signal receiver can determine the first root in various ways, offering considerable flexibility.

[0011] In one optional implementation, the first threshold is greater than or equal to the time-domain sliding range of the first detection window, which is used to detect the first LP-SS. Having the first threshold greater than or equal to the time-domain sliding range of the first detection window allows for a greater time-domain distance between the correlation peak caused by frequency offset in the LP-SS and the correlation peak of the actual signal. For example, the correlation peak caused by frequency offset may fall outside the time-domain sliding range of the first detection window, while within the time-domain sliding range of the first detection window, there may only be the correlation peak of the actual signal. This reduces the probability of false detection at the signal receiver and improves time-frequency synchronization performance.

[0012] Secondly, a second communication method is provided, which is applied to a first device. The first device is, for example, a terminal-side device or a network-side device; for an introduction to the terminal-side device or network-side device, please refer to the first aspect. The method includes: determining a first root, wherein the first root belongs to a first root set; sending or receiving a first LP-SS, wherein the first LP-SS is determined based on a first ZC sequence (or, the first LP-SS corresponds to the first ZC sequence), and the first ZC sequence is determined based on the first root (or, the first ZC sequence corresponds to the first root); wherein the first root set satisfies one or more of the following: when the length of the first ZC sequence is 23, the first root set includes at least one of 5, 7, 9, and 14; when the length of the first ZC sequence is 29, the first root set includes at least one of 5, 6, 7, 8, 12, and 17; when the length of the first ZC sequence is 23, the first root set includes at least one of 5, 6, 7, 8, 12, and 17 ...3, the first root set includes at least one of 5, 6, 7, 8, 12, and 17; When the length of the ZC sequence is 31, the first root set includes at least one of 5, 6, 12, 13, 18, and 19; when the length of the first ZC sequence is 53, the first root set includes at least one of 5, 6, 12, 16, 24, and 29; when the length of the first ZC sequence is 59, the first root set includes at least one of 5, 6, 16, 18, 27, and 32; when the length of the first ZC sequence is 61, the first root set includes at least one of 5, 11, 22, 28, 33, and 39; or, when the length of the first ZC sequence is 127, the first root set includes at least one of 5, 11, 22, 33, 37, and 44.

[0013] In one alternative implementation, the first root is determined based on a first signaling from a network device; the first root is determined from the first root set based on the identifier of a first cell, the first cell being the cell transmitting the first LP-SS; or, the first root is determined from the first root set based on the index of a first time unit, the first time unit being the time unit for transmitting the first LP-SS.

[0014] In an optional implementation, the first root set further satisfies one or more of the following: when the length of the first ZC sequence is 23, the first root set further includes at least one of 1, 6, 8, 11, 12, 15, 17, 22; when the length of the first ZC sequence is 29, the first root set further includes at least one of 1, 10, 14, 15, 19, 22, 28; when the length of the first ZC sequence is 31, the first root set further includes at least one of 1, 8, 10, 15, 16, 21, 23, 30; when the length of the first ZC sequence is 53 ... The first root set further includes at least one of 1, 13, 18, 26, 27, 35, 40, and 52; when the length of the second ZC sequence is 59, the first root set further includes at least one of 1, 15, 20, 29, 30, 39, 44, and 58; when the length of the first ZC sequence is 61, the first root set further includes at least one of 1, 15, 20, 30, 31, 41, 46, and 60; or, when the length of the first ZC sequence is 127, the first root set further includes at least one of 1, 32, 42, 63, 64, 85, 95, and 126.

[0015] In an alternative implementation, the first root set is also used for LP-WUS.

[0016] For the technical effects of the second aspect or various alternative implementation methods, please refer to the introduction of the technical effects of the first aspect or corresponding implementation methods.

[0017] Thirdly, a third communication method is provided, which is applied to a second device. The second device is, for example, a terminal-side device or a network-side device; for a description of the terminal-side device or network-side device, please refer to the first aspect. The method includes: determining a third root, wherein when the frequency offset of the LP-WUS corresponding to the third root is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold (or, when the frequency offset of the ZC sequence corresponding to the third root is less than or equal to the second value, the equivalent time-domain offset of the ZC sequence is less than or equal to the second threshold); transmitting or receiving a first LP-WUS, the first LP-WUS being determined based on a second ZC sequence (or, the first LP-WUS corresponding to a second ZC sequence), the second ZC sequence being determined based on the third root (or, the second ZC sequence corresponding to the third root).

[0018] This application embodiment considers that the time-domain offset of the correlation peak is related to the root of the ZC sequence, and the root of the ZC sequence may affect the position of the correlation peak. Therefore, this application embodiment can select a suitable root for signals using ZC sequences. For example, for the first LP-WUS, a third root can be selected. The third root satisfies the following condition: when the frequency offset of the LP-WUS corresponding to the third root is less than or equal to a second value, the equivalent time-domain offset of the LP-SS is less than or equal to a second threshold. This can be understood as follows: if the ZC sequence using the third root has a frequency offset, the resulting time-domain offset is smaller. When the receiver of the first LP-WUS performs coherent demodulation on the first LP-WUS, the correlation value corresponding to the actual first LP-WUS can always be greater than other correlation values. Therefore, the signal receiver can successfully demodulate, improving the demodulation success rate of the first LP-WUS.

[0019] In one optional implementation, the third root belongs to the second root set, wherein any one of at least one root in the second root set satisfies the following: when the frequency offset of the LP-WUS corresponding to the any one root is less than or equal to the second value, the equivalent time-domain offset of the LP-WUS is less than or equal to the second threshold; or satisfies the following: when the frequency offset of the ZC sequence corresponding to the any one root is less than or equal to the second value, the equivalent time-domain offset of the ZC sequence is less than or equal to the second threshold. It can be understood that the at least one root in the second root set can be applied to LP-WUS. The at least one root may be, for example, some or all of the roots included in the second root set.

[0020] In one optional implementation, the second root set further includes a fourth root, which satisfies the following conditions: when the frequency offset of the LP-SS corresponding to the second root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS is greater than a first threshold; or when the frequency offset of the ZC sequence corresponding to the second root is less than or equal to the first value, the equivalent time-domain offset of the ZC sequence is greater than the first threshold. The second root set may include only roots applicable to LP-WUS, or it may include other roots. For example, the second root set may also include a fourth root, which may be applicable to LP-SS, for example. That is, the second root set can be implemented in various ways.

[0021] In one optional implementation, the second root set satisfies one or more of the following: when the length of the second ZC sequence is 23, the second root set includes at least one of 1, 6, 8, 11, 12, 15, 17, 22; when the length of the second ZC sequence is 29, the second root set includes at least one of 1, 7, 10, 14, 15, 19, 22, 28; when the length of the second ZC sequence is 31, the second root set includes at least one of 1, 8, 10, 15, 16, 21, 23, 30; when the length of the second ZC sequence is 53, ... The second root set includes at least one of 1, 13, 18, 26, 27, 35, 40, and 52; when the length of the second ZC sequence is 59, the second root set includes at least one of 1, 15, 20, 29, 30, 39, 44, and 58; when the length of the second ZC sequence is 61, the second root set includes at least one of 1, 15, 20, 30, 31, 41, 46, and 60; or, when the length of the second ZC sequence is 127, the second root set includes at least one of 1, 32, 42, 63, 64, 85, 95, and 126. Optionally, in addition to these roots, the second root set may also include other roots, without limitation.

[0022] In one alternative implementation, the third root is determined based on second signaling from the network device; the third root is determined from the second root set based on the identifier of the second cell, which is the cell transmitting the first LP-WUS; or, the third root is determined from the second root set based on the index of the second time unit, which is the time unit for transmitting the first LP-WUS. Both the signal transmitter and the signal receiver can determine the third root in various ways, offering considerable flexibility.

[0023] In one optional implementation, the second threshold is greater than or equal to the time-domain sliding range of the second detection window, which is used to detect the first LP-WUS. This second threshold ensures that the correlation value corresponding to the actual first LP-WUS is always greater than other correlation values, thus enabling successful demodulation at the signal receiver and improving the demodulation success rate of the first LP-WUS.

[0024] Fourthly, a fourth communication method is provided, which is applied to a third device. The third device is, for example, a terminal-side device or a network-side device; for an introduction to the terminal-side device or network-side device, please refer to the first aspect. The method includes: transmitting or receiving a second LP-SS, the second LP-SS comprising M modulation symbols, of which N modulation symbols indicate a third value, wherein the N modulation symbols correspond to N ZC sequences, at least two of the N ZC sequences have different roots, M is a positive integer, and N is a positive integer less than or equal to M.

[0025] This application embodiment takes into account that the time-domain offset of the correlation peak is related to the root of the ZC sequence, and the root of the ZC sequence may affect the position of the correlation peak. Therefore, this application embodiment can select a suitable root for signals using ZC sequences. For example, for the second LP-SS, at least two roots of the N ZC sequences on N modulation symbols can be different, thereby improving the time-frequency synchronization performance of the signal receiver based on the second LP-SS.

[0026] In one optional implementation, the modulation scheme corresponding to the M modulation symbols is OOK modulation.

[0027] In one alternative implementation, the third value is 1 or on. For modulation symbols indicating 1 or on, ZC sequences can be carried, and embodiments of this application can make these ZC sequences correspond to different roots.

[0028] In one optional implementation, the roots of any two ZC sequences among the N ZC sequences are different. Alternatively, the roots of all N ZC sequences are different, which can further improve the time-frequency synchronization performance of the signal receiver based on the second LP-SS.

[0029] In one optional implementation, the root of any ZC sequence among the N ZC sequences satisfies the following: when the frequency offset of the LP-WUS corresponding to the root of any ZC sequence is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold; or satisfies the following: when the frequency offset of the ZC sequence corresponding to the root of any ZC sequence is less than or equal to a second value, the equivalent time-domain offset of the ZC sequence is less than or equal to a second threshold.

[0030] In one optional implementation, the roots of the N ZC sequences belong to a third root set, which satisfies one or more of the following: when the length of the ZC sequence is 23, the third root set includes at least one of 1, 6, 8, 11, 12, 15, 17, 22; when the length of the ZC sequence is 29, the third root set includes at least one of 1, 7, 10, 14, 15, 19, 22, 28; when the length of the ZC sequence is 31, the third root set includes at least one of 1, 8, 10, 15, 16, 21, 23, 30; when the length of the ZC sequence is... When the length is 53, the third root set includes at least one of 1, 13, 18, 26, 27, 35, 40, and 52; when the length of the ZC sequence is 59, the third root set includes at least one of 1, 15, 20, 29, 30, 39, 44, and 58; when the length of the ZC sequence is 61, the third root set includes at least one of 1, 15, 20, 30, 31, 41, 46, and 60; or, when the length of the ZC sequence is 127, the third root set includes at least one of 1, 32, 42, 63, 64, 85, 95, and 126.

[0031] Regarding the technical effects of the optional implementation methods in the fourth aspect, one or more of the following can be referenced: a description of the technical effects of the first aspect or corresponding implementation method, a description of the technical effects of the second aspect or corresponding implementation method, or a description of the technical effects of the third aspect or corresponding implementation method.

[0032] Fifthly, a communication device is provided. The communication device can implement the functions of the first device described in the first or second aspect, the second device described in the third aspect, or the third device described in the fourth aspect. The communication device possesses the functions of the first, second, or third device. The communication device is, for example, a terminal device, or other device including terminal device functions, or a chip system (or chip) or other functional module capable of implementing the functions of the terminal device, and the chip system or functional module is, for example, disposed in the terminal device. Alternatively, the communication device is, for example, a network device, or other device including network device functions, or a chip system (or chip) or other functional module capable of implementing the functions of a network device, and the chip system or functional module is, for example, disposed in the network device. The network device includes, for example, access network devices and / or core network devices. In one optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes also called a processing module) and a transceiver unit (sometimes also called a transceiver module). A transceiver unit can perform both sending and receiving functions. When the transceiver unit performs the sending function, it can be called a sending unit (sometimes also called a sending module), and when it performs the receiving function, it can be called a receiving unit (sometimes also called a receiving module). The sending unit and the receiving unit can be the same functional module, which is called the transceiver unit and can perform both sending and receiving functions; or, the sending unit and the receiving unit can be different functional modules, and the transceiver unit is a collective term for these functional modules.

[0033] In one optional implementation, the processing unit is configured to determine a first root, wherein when the frequency offset of the LP-SS corresponding to the first root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS is greater than a first threshold; the transceiver unit is configured to transmit or receive a first LP-SS, the first LP-SS being determined based on a first ZC sequence (or, the first LP-SS corresponding to a first ZC sequence), the first ZC sequence being determined based on the first root (or, the first ZC sequence corresponding to the first root).

[0034] In one optional implementation, the processing unit is configured to determine a first root, wherein the first root belongs to a first root set; the transceiver unit is configured to send or receive a first LP-SS, wherein the first LP-SS is determined based on a first ZC sequence (or, the first LP-SS corresponds to the first ZC sequence), and the first ZC sequence is determined based on the first root (or, the first ZC sequence corresponds to the first root); wherein the first root set satisfies one or more of the following: when the length of the first ZC sequence is 23, the first root set includes at least one of 5, 7, 9, and 14; when the length of the first ZC sequence is 29, the first root set includes 5, 6, 7, 8, 12, and 17. The first root set includes at least one of the following: when the length of the first ZC sequence is 31, the first root set includes at least one of 5, 6, 12, 13, 18, and 19; when the length of the first ZC sequence is 53, the first root set includes at least one of 5, 6, 12, 16, 24, and 29; when the length of the first ZC sequence is 59, the first root set includes at least one of 5, 6, 16, 18, 27, and 32; when the length of the first ZC sequence is 61, the first root set includes at least one of 5, 11, 22, 28, 33, and 39; or, when the length of the first ZC sequence is 127, the first root set includes at least one of 5, 11, 22, 33, 37, and 44.

[0035] In one optional implementation, the processing unit is configured to determine a third root, wherein when the frequency offset of the LP-WUS corresponding to the third root is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold; the transceiver unit is configured to transmit or receive a first LP-WUS, the first LP-WUS being determined based on a second ZC sequence (or, the first LP-WUS corresponding to the second ZC sequence), the second ZC sequence being determined based on the third root (or, the second ZC sequence corresponding to the third root).

[0036] In one optional implementation, the transceiver unit is configured to transmit or receive a second LP-SS, the second LP-SS comprising M modulation symbols, N of which indicate a third value, wherein the N modulation symbols correspond to N ZC sequences, at least two of the N ZC sequences have different roots, M is a positive integer, and N is a positive integer less than or equal to M.

[0037] In an alternative embodiment, the communication device further includes a storage unit (sometimes also called a storage module), and the processing unit is configured to couple with the storage unit and execute programs or instructions in the storage unit to enable the communication device to perform the functions of the first device described in the first or second aspect above, or to enable the communication device to perform the functions of the second device described in the third aspect above, or to enable the communication device to perform the functions of the third device described in the fourth aspect above.

[0038] Sixthly, a communication device is provided, which can be a terminal device or a chip or chip system for use in a terminal device. The communication device includes a processor configured to perform the methods executed by the first, second, or third device in the aforementioned aspects. Optionally, the processor is coupled to a memory, which, when reading the computer program or instructions, causes the communication device to perform the methods executed by the first, second, or third device in the aforementioned aspects. The memory is used to store the computer program or instructions and can be included in the communication device or disposed externally. Optionally, the communication device further includes a communication interface from which the processor calls and runs the computer program or instructions.

[0039] A seventh aspect provides a communication device, which can be a network device or a chip or chip system for use in a network device. The communication device includes a processor configured to perform the methods executed by the first, second, or third device in the aforementioned aspects. Optionally, the processor is coupled to a memory, which, when reading the computer program or instructions, causes the communication device to perform the methods executed by the first, second, or third device in the aforementioned aspects. The memory is used to store the computer program or instructions and can be included in the communication device or disposed externally. Optionally, the communication device further includes a communication interface from which the processor calls and runs the computer program or instructions.

[0040] Eighthly, a communication system is provided, including a terminal device and a network device. The terminal device is configured to perform the method executed by the first device as described in the first or second aspect above, and the network device is configured to perform the method executed by the first device as described in the first or second aspect above; or, the terminal device is configured to perform the method executed by the second device as described in the third aspect above, and the network device is configured to perform the method executed by the second device as described in the third aspect above; or, the terminal device is configured to perform the method executed by the third device as described in the fourth aspect above, and the network device is configured to perform the method executed by the third device as described in the fourth aspect above. For example, the terminal device can be implemented using the communication device described in the fifth or seventh aspect, and the network device can be implemented using the communication device described in the fifth or sixth aspect. Optionally, the communication system may also include other devices, without limitation.

[0041] A ninth aspect provides a computer-readable storage medium for storing a computer program or instructions that, when executed, cause the method performed by the first and / or second and / or third means in the foregoing aspects to be implemented.

[0042] In a tenth aspect, a computer program product containing instructions is provided, which, when the computer program or instructions are run on a computer, causes the methods described in the above aspects to be implemented. Attached Figure Description

[0043] Figure 1 and Figure 2 These are schematic diagrams of two different structures of the access network equipment in the embodiments of this application;

[0044] Figure 3 This is a schematic diagram of the OOK modulation method;

[0045] Figure 4A This is a schematic diagram of a coherent detection process;

[0046] Figure 4B This is a schematic diagram of the relevant peaks;

[0047] Figure 5 This is a schematic diagram illustrating how frequency offset causes a time-domain shift in the correlation peak.

[0048] Figure 6A and Figure 6B These are schematic diagrams illustrating two application scenarios of embodiments of this application;

[0049] Figure 7 , Figure 11 , Figure 14 Flowcharts of several communication methods provided in the embodiments of this application;

[0050] Figure 8A and Figure 8B This is a schematic diagram of different time offsets corresponding to the same frequency offset but different roots in the embodiments of this application;

[0051] Figure 9 This is an example of several correlation results corresponding to the use of time-frequency bias-robust ZC sequences in the embodiments of this application;

[0052] Figure 10 Examples of multiple correlation results corresponding to the use of time-frequency biased ZC sequences in the LP-SS embodiments of this application;

[0053] Figure 12 This is an example of several correlation results corresponding to the use of a time-frequency biased ZC sequence in the LP-WUS implementation of this application.

[0054] Figure 13 Examples of multiple correlation results corresponding to the use of time-frequency bias-robust ZC sequences in the embodiments of this application;

[0055] Figures 15A-15C These are examples of several coherent demodulation results obtained by the signal receiver for LP-SS in the embodiments of this application;

[0056] Figure 16 A schematic diagram of an apparatus provided in an embodiment of this application;

[0057] Figure 17 This is a schematic diagram of another device provided in an embodiment of this application. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0059] In the embodiments of this application, the number of nouns, unless otherwise specified, refers to "singular nouns or plural nouns", that is, "one or more".

[0060] "At least one" means one or more, while "more than" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. For example, A / B means: A or B. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and / or c can mean: a alone, b alone, c alone, a and b simultaneously, b and c simultaneously, a and c simultaneously, or a, b, and c simultaneously, where a, b, and c can be single or multiple.

[0061] The ordinal numbers such as "first" and "second" mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority, or importance of the multiple objects. Furthermore, the numbering of steps in the various embodiments described in this application is only to distinguish different steps and is not used to limit the order in which the steps are performed.

[0062] In the embodiments of this application, "instruction" can include direct instruction, indirect instruction, explicit instruction, implicit instruction, etc. When describing a certain instruction information as being used to instruct A, it can be understood that the instruction information carries A, carries the identifier of A, carries B which is associated with A, carries the identifier of B which is associated with A, etc. In other words, if the receiving side of a certain instruction information can determine A based on the instruction information, it can be described as the instruction information being used to instruct A, and the specific method of determination is not limited. When it is understood that the instruction information carries A, "instruction" or "used to instruct" can be replaced with "includes". In this case, a statement similar to "sending / receiving instruction information, the instruction information being used to instruct A" can be replaced with "sending / receiving A".

[0063] In this embodiment, "send" and "receive" indicate the direction of signal transmission. For example, "send information to XX" can be understood as the destination of the information being XX, which may include direct transmission via the air interface or indirect transmission by other units or modules via the air interface. "Receive information from YY" can be understood as the source of the information being YY, which may include direct reception from YY via the air interface or indirect reception from YY by other units or modules via the air interface. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface. In other words, sending and receiving can occur between devices, such as between network devices and terminal devices, or within a device, such as between components, modules, chips, software modules, or hardware modules within the device via a bus, wiring, or interface.

[0064] The following explanations of some terms or concepts used in the embodiments of this application are provided to facilitate understanding by those skilled in the art.

[0065] In this embodiment of the application, the terminal device is a device with wireless transceiver function, which may be a fixed device, a mobile device, a handheld device (e.g., a mobile phone), a wearable device, an in-vehicle device, or a wireless device (e.g., a communication module, a modem, or a chip system, etc.) built into the above devices. The terminal devices are used to connect people, objects, and machines, and can be widely used in various scenarios, including but not limited to the following: sensing scenarios, cellular communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine / machine-type (M2M / MTC) communication, Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical care, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city, drones, robots, and terminal devices in indoor commercial scenarios (such as mobile phone screen mirroring, file sharing, and mobile phone to VR glasses). When the terminal equipment is applied to V2X, it can also be called a V2X device, such as a smart car, digital car, unmanned car, driverless car, pilotless car, or automobile, self-driving car, or autonomous car, pure electric vehicle (EV), hybrid electric vehicle (HEV), range-extended electric vehicle (REEV), plug-in hybrid electric vehicle (PHEV), new energy vehicle, or roadside unit (RSU). The terminal equipment can also be a device used in D2D communication, such as an electricity meter or water meter.

[0066] Furthermore, in this embodiment of the application, the terminal device can also be a terminal device in an Internet of Things (IoT) system. IoT is an important component of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection.

[0067] The various terminal devices described above, if located in a vehicle (e.g., placed inside or installed inside a vehicle), can all be considered in-vehicle terminal devices, also known as on-board units (OBUs). The terminal device of this application can also be an in-vehicle module, in-vehicle component, in-vehicle chip, or in-vehicle unit built into a vehicle as one or more components or units. The vehicle can implement the methods of this application through the built-in in-vehicle module, in-vehicle component, in-vehicle chip, or in-vehicle unit.

[0068] The terminal equipment may sometimes be referred to as UE, terminal, access station, UE station, remote station, wireless communication equipment, or user equipment, etc.

[0069] In this application embodiment, the device for implementing the terminal device function can be a terminal device, which can be a terminal device or a device capable of supporting the terminal device in implementing the function, such as a chip system. This device can be installed in the terminal device. In the technical solutions provided in this application embodiment, the example of a terminal device being used to implement the terminal device function is used to describe the technical solutions provided in this application embodiment.

[0070] The network devices in this application embodiment include, for example, access network devices (or access network elements) and / or core network devices (or core network elements). The access network devices are devices with wireless transceiver capabilities, used to communicate with the terminal devices. The access network devices include, but are not limited to, base stations (base transceiver stations (BTS), Node B, evolved Node B (eNodeB) / eNB, or the next generation Node B (gNodeB) / gNB), transmission reception points (TRPs), base stations evolved from the 3rd generation partnership project (3GPP), access nodes in wireless fidelity (Wi-Fi) systems, wireless relay nodes, wireless backhaul nodes, etc. The base stations can be: macro base stations, micro base stations, pico base stations, small cells, relay stations, etc. Multiple base stations can support networks using the same access technology or networks using different access technologies. A base station can contain one or more co-located or non-co-located transmission and reception points. The access network equipment can also be a radio controller, centralized unit (CU), and / or distributed unit (DU) in a cloud radioaccess network (CRAN) scenario. The access network equipment can also be a server, etc. For example, the network equipment in V2X technology can be a roadside unit (RSU). The following description uses a base station as an example to illustrate the access network equipment. A base station can communicate with a terminal device, or it can communicate with a terminal device through a relay station. A terminal device can communicate with multiple base stations in different access technologies. The core network equipment is used to implement functions such as mobility management, data processing, session management, policy and billing. The names of the equipment implementing core network functions may differ in systems using different access technologies; this application does not limit this.Taking the 5th generation (5G) mobile communication technology system as an example, the core network equipment includes, for example, access and mobility management function (AMF), session management function (SMF), policy control function (PCF), or user plane function (UPF), etc.

[0071] In a CU-DU architecture, or in an open RAN (ORAN) system, access network equipment may include one or more logical network elements such as a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). CUs and DUs can be separate entities or included in the same network element, such as a baseband unit (BBU). RUs may be included in radio equipment or radio units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs). One possible structure for access network equipment can be found in [reference needed]. Figure 1 Among them, core network equipment and access network equipment can communicate through backhaul links; within access network equipment, CU and DU can communicate through midhaul links, and DU and RU can communicate through fronthaul links.

[0072] Alternatively, another architecture for the access network equipment can be referenced. Figure 2 , Figure 2Taking access network equipment implemented through chips as an example, such as a RAN chip, the RAN chip may include a CU, DU, and RU. The CU can perform L2 and L3 functions, etc.; the DU can perform L1 functions and some L2 functions, etc.; and the RU can perform L1 computing and radio frequency (RF) digital functions, etc. The CU communicates with the core network equipment through a backhaul interface, which carries the traffic between the CU and the core network equipment. The CU may include a central processing unit (CPU) based on x86 or ARM architecture, as well as field programmable gate arrays (FPGAs), graphics processing units (GPUs), or other accelerators, etc. The CPU and the FPGA, GPU, or other accelerators can communicate through a peripheral component interconnect express (PCIe) interface.

[0073] The CU and DU communicate via a midhaul interface, which carries the traffic between the CU and DU. The DU may include an x86 or ARM architecture CPU, as well as FPGAs, GPUs, or other accelerators, which can communicate with the FPGA, GPU, or other accelerators via a PCIe interface.

[0074] The DU and RU communicate via a fronthaul interface, which carries the traffic between the DU and RU. If the access network equipment uses an integrated DU, the integrated DU can include the functions of both the DU and RU, and the RAN may no longer need to include a separate RU. The RU may include a RAN fronthaul processing unit, a digital processing unit, and an RF processing unit. The RAN fronthaul processing unit is implemented, for example, using an FPGA or an application-specific integrated circuit (ASIC). The digital processing unit is implemented, for example, using an FPGA or an ASIC.

[0075] The RU can be connected to an antenna to communicate with the UE via the antenna.

[0076] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called an open CU (O-CU), DU can also be called an open DU (O-DU), CU-CP can also be called an open CU-CP (O-CU-CP), CU-UP can also be called an open CU-UP (O-CU-CP), and RU can also be called an open RU (O-RU). For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples in its embodiments. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in the embodiments of this application can be implemented through software modules, hardware modules, or a combination of software modules and hardware modules.

[0077] The CU and DU can be configured according to the protocol layer functions of the wireless network they implement. For example, the CU can be configured to implement the functions of the Packet Data Convergence Protocol (PDCP) layer and above (such as the Radio Resource Control (RRC) layer and / or the Service Data Adaptation Protocol (SDAP) layer); the DU can be configured to implement the functions of protocol layers below the PDCP layer (such as one or more of the Radio Link Control (RLC) layer, Media Access Control (MAC) layer, or Physical (PHY) layer). Alternatively, the CU can be configured to implement the functions of protocol layers above the PDCP layer (such as the RRC and / or SDAP layers), and the DU can be configured to implement the functions of protocol layers below the PDCP layer (such as one or more of the RLC, MAC, or PHY layers).

[0078] The above CU and DU configurations are merely examples; the functions of the CU and DU can be configured as needed. For instance, the CU or DU can be configured to have more protocol layer functions, or only some protocol layer processing functions. For example, some RLC layer functions and protocol layer functions above the RLC layer can be placed in the CU, while the remaining RLC layer functions and protocol layer functions below the RLC layer can be placed in the DU. Furthermore, the functions of the CU or DU can be divided according to service type or other system requirements, such as by latency. Functions that require low latency can be placed in the DU, while functions that do not require low latency can be placed in the CU.

[0079] DU and RU can cooperate to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of DU and RU can be configured in various ways depending on the design. For example, a DU can be configured to implement baseband functions, and an RU can be configured to implement mid-RF functions. Another example is that a DU can be configured to implement higher-level functions in the PHY layer, and an RU can be configured to implement lower-level functions in the PHY layer, or to implement both lower-level and RF functions. Higher-level functions in the physical layer can include a portion of the physical layer's functions that are closer to the MAC layer, while lower-level functions in the physical layer can include another portion of the physical layer's functions that are closer to the mid-RF side.

[0080] In this application embodiment, the apparatus for implementing the functions of a network device can be referred to as a network apparatus. This network apparatus can be a network element, a network device, or an apparatus capable of supporting the network device or network element in implementing the function, such as a chip system. This apparatus can be installed within the network device. In the technical solutions provided in this application embodiment, the apparatus for implementing the functions of a network device is described as a network apparatus (for example, an apparatus for implementing the functions of an access network apparatus is an access network apparatus, and an apparatus for implementing the functions of a core network apparatus is a core network apparatus).

[0081] The technical features involved in the embodiments of this application are described below.

[0082] In wireless communication systems, a complex sequence called Zadoff-Chu, or ZC sequence for short, is commonly used. ZC sequences can be used to generate synchronization signals, reference signals, waveform signals, etc., in communication systems. For example, the low-power wake-up signal (LP-WUS) can be generated using a ZC sequence. LP-WUS technology uses a low-power wake-up signal to replace traditional wake-up methods, reducing UE power consumption. Similarly, the low-power synchronization signal (LP-SS) can also be generated using a ZC sequence; LP-SS can be used for basic timing and synchronization.

[0083] The expression for the ZC sequence is:

[0084]

[0085] Among them B ZC Let q represent the length of the ZC sequence, and let q represent the root of the ZC sequence, where 1 ≤ q. ZC x q (m) represents a ZC sequence with root q, where m is an integer. For example, suppose B ZC =5, root =3, can be calculated by substituting into formula 1:

[0086]

[0087] x in Formula 2 q＝3 (m) represents a ZC sequence of length 5 and root 3.

[0088] In some communication systems, signals that are easy for low-power receivers to demodulate need to be transmitted, such as signals modulated by on-off-keying (OOK). OOK modulation allows information to be transmitted simply by whether a signal is being transmitted. For example, the modulation symbol for transmitting a signal represents "1" or "ON," while the modulation symbol for not transmitting a signal represents "0" or "OFF." For simple modulation waveforms like OOK, the receiver can use simple envelope detection for demodulation, thus achieving the goals of low complexity, low power consumption, and low cost. For example, the low-power wake-up signal (LP-WUS) in 5G new radio (NR) systems can use OOK modulation.

[0089] ​OOK modulation symbols can be generated in different ways. For example, one method uses an orthogonal frequency division multiplexing (OFDM) transmitter to generate OOK modulation symbols. That is, the OFDM transmitter can use a ZC sequence to generate OOK modulation symbols representing "1" or "ON". One OFDM symbol corresponds to one or more OOK modulation symbols. When transmitting an OOK modulation symbol of "1" or "ON", the OFDM transmitter can map a ZC sequence onto the subcarrier of the corresponding OFDM symbol; when transmitting an OOK modulation symbol of "0" or "OFF", the OFDM transmitter can leave the signal unmodulated on the subcarrier of the corresponding OFDM symbol. Thus, in the signal obtained after processing the OOK modulation symbols using inverse fast fourier transform (IFFT), some OFDM symbols have energy ("ON"), while others have no energy ("OFF"). For example, see reference... Figure 3 This is an example of using a ZC sequence to generate an OOK modulated signal. Figure 3 The shaded area on the left represents the ZC sequence, and the blank area represents no signal. It can be seen that, for a period of time, OFDM symbols 0, 3-4, 6, and 9-10 carried the ZC sequence, while the other OFDM symbols did not carry a signal. Therefore, the final signal transmitted by the transmitter can be referenced... Figure 3 On the right side, the position corresponding to the OFDM symbol with the ZC sequence is "ON", and the position corresponding to the OFDM symbol without a signal is "OFF".

[0090] Besides using the "ON" / "OFF" of the OOK signal to transmit information, the transmitter can further improve the data rate or transmission performance by using cyclic shift (CS). Cyclic shift refers to multiplying the aforementioned ZC sequence by a cyclically shifted sequence and then mapping the resulting sequence onto the aforementioned subcarriers. For example, the resulting sequence can be represented as x. q (m)·e jαm , where e jαm Let α represent the cyclic shift sequence, and x represent the cyclic shift. q(m) represents a ZC sequence rooted at q. The transmitter can carry different information using different cyclic shifts. For example, the transmitter and receiver can agree that there are four cyclic shifts {α0, α1, α2, α3} available, and {α0, α1, α2, α3} represent bit information {00, 01, 10, 11} respectively. After generating the ZC sequence, the transmitter can further multiply it by a cyclic shift sequence to carry 2 bits of information in the resulting sequence. In addition to detecting the ON / OFF state of the OOK signal to receive information, the receiver can also perform cyclic shift detection to determine the information transmitted via cyclic shift. As one implementation, the receiver can sequentially use the agreed cyclic shift sequences to perform sequence correlation with the received sequence and determine the cyclic shift with the highest correlation value as the cyclic shift used for that received sequence.

[0091] At the signal receiving end, an envelope detection receiver can be used to demodulate the signal. In this case, the envelope detection receiver only needs to compare the energy of each OFDM symbol of the received signal with a threshold to determine whether each OFDM symbol carries "ON" or "OFF". Envelope detection receivers have low power consumption and cost, but their noise figure is usually relatively high, and demodulation performance degrades significantly with increasing noise levels.

[0092] To improve demodulation performance, the signal receiver can also use a coherent receiver to demodulate the signal. A coherent receiver samples the received signal and performs correlation calculations with the sampled result against a local ZC sequence to achieve demodulation. This local ZC sequence is the ZC sequence transmitted by the signal transmitter, known to the signal receiver before synchronization with the signal transmitter. During demodulation, the coherent receiver can sample the received signal. For example, it can capture the received signal and perform correlation calculations within a detection window or sliding window. This detection window can slide within a certain range, moving one sampling point with each slide, completing one signal capture and correlation calculation per slide.

[0093] For example, during the l-th sliding of the detection window, the length of the signal intercepted by the detection window includes N. sym The expression for the signal intercepted at each sampling point is:

[0094] r l (n) = r(l+n), 0 <n≤N sym (Formula 5)

[0095] Where n is a positive integer. The relevant receiver will intercept the signal r. l(n) is correlated with the local ZC sequence to obtain the correlation value. This correlation calculation process is represented, for example, as follows:

[0096]

[0097] Where C(l) represents the correlation value, s sync (n) represents the local ZC sequence. s sync The conjugate of (n). Each time the detection window slides, or each time it slides a sampling point, a correlation value C(l) is obtained. This correlation value reaches its maximum when the detection window exactly coincides with the received signal. A significant correlation peak will appear at this point. Here, |x| represents the absolute value of x.

[0098] For example, refer to Figure 4A The shaded area represents the signal to be detected, and the detection window detects this signal by sliding. The calculated correlation value reaches its maximum when the detection window slides to coincide with the signal (i.e., is aligned). Figure 4B This indicates the correlation peak corresponding to the correlation value (e.g.) Figure 4B (As shown by the highest point of the curve in the diagram). Figure 4B The horizontal axis represents time, or the number of times the detection window slides; the vertical axis represents the correlation value.

[0099] Some low-cost, low-power coherent receivers may exist in the network. These receivers use crystal oscillators with lower precision, and using such oscillators for down-conversion and demodulation may introduce frequency offset. If a frequency offset is introduced into a ZC sequence, it may cause a shift in the time-domain position of the correlation peak; that is, a frequency offset in a ZC sequence may lead to a corresponding time offset. Furthermore, different frequency offsets may result in different time-domain shifts of the correlation peak. For example, refer to... Figure 5 , where represents the time-domain shift of the correlation peak corresponding to different frequency offsets. According to Figure 5 As can be seen, without frequency offset, the correlation peak does not exhibit time-domain shift. The time-domain shift of the correlation peak corresponding to a frequency offset of 1 subcarrier width is smaller than that corresponding to a frequency offset of 2 subcarrier widths. If the time-domain shift of the correlation peak caused by the frequency offset is large, for example, if the correlation peak exceeds the time range of the detection window (i.e., the width of the detection window), it may lead to coherent demodulation failure.

[0100] In view of this, the embodiments of this application consider that the time-domain offset of the correlation peak is related to the root of the ZC sequence, and the root of the ZC sequence may affect the position of the correlation peak. Therefore, the embodiments of this application can select a suitable root for signals using the ZC sequence. For example, for the first LP-SS, a first root can be selected. The first root satisfies the following: when the frequency offset of the LP-SS corresponding to the first root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS is greater than a first threshold. This can be understood as follows: if the ZC sequence using the first root has a frequency offset, the resulting time-domain offset will be large. When the receiver of the first LP-SS performs coherent demodulation on the first LP-SS, although it may obtain multiple correlation peaks, due to the characteristics of the first root, the time-domain interval of each correlation peak is large. For example, only the correlation peak corresponding to the real signal may fall within the detection window range. Therefore, the receiver can demodulate successfully, improving the demodulation success rate of the first LP-SS.

[0101] The technical solutions provided in this application can be applied to 4G systems, such as Long Term Evolution (LTE) systems, or to 5G systems, such as New Radio (NR) systems, or to next-generation mobile communication systems or other similar communication systems, such as the 6th generation (6G) systems, etc., without specific limitations. Furthermore, while this application describes communication between network devices and UEs as an example, the technical solutions provided in this application can also be used for sidelink (SL) communication between UEs. For example, this technical solution can be applied to D2D scenarios, such as NR-D2D scenarios, or to V2X scenarios, such as NR-V2X scenarios. For example, this application can be used in fields such as factory manufacturing, smart homes, intelligent driving, assisted driving, intelligent connected vehicles, or indoor commercial scenarios.

[0102] Please refer to Figure 6A This is a schematic diagram of an application scenario according to an embodiment of this application. Figure 6A This includes network devices and UEs, and the signals transmitted between network devices and UEs can be generated based on the ZC sequence. Figure 6A Taking one UE and one network device as an example, there is no actual limit to the number of UEs, nor is there a limit to the number of network devices.

[0103] Please refer to this again. Figure 6B This is a schematic diagram of another application scenario of this application embodiment. Figure 6B Including UE1 and UE2, the signals transmitted between UE1 and UE2 can be generated according to the ZC sequence.

[0104] The method provided in the embodiments of this application is described below with reference to the accompanying drawings. In the various embodiments of this application, "frequency offset" is simply referred to as "frequency deviation," and "time domain offset" is simply referred to as "time deviation." In the accompanying drawings corresponding to the various embodiments of this application, all steps indicated by dashed lines are optional steps. The various embodiments herein can be applied to... Figure 6A The network architecture shown. For example, the signal transmitter described in the various embodiments of this document can be... Figure 6A In the UE, the signal receiver described in the various embodiments of this document can be... Figure 6A The network device in the document; or, the signal transmitting end described in the various embodiments of this document may be a network device; Figure 6A In the network devices described in the various embodiments of this document, the signal receiving end can be... Figure 6A The UE in the document. Alternatively, the various embodiments herein can be applied to... Figure 6B The network architecture shown. For example, the signal transmitter described in the various embodiments of this document can be... Figure 6B In the UE1 described in the various embodiments of this document, the signal receiver can be... Figure 6B UE2 in the example; or, the signal transmitter described in the various embodiments of this document can be UE2; Figure 6B In the UE2 described in the various embodiments of this document, the signal receiver can be... Figure 6B UE1 in the middle.

[0105] This application provides a communication method. Please refer to... Figure 7 Here is a flowchart of the method.

[0106] S701, The signal transmitting end determines the first root.

[0107] When the signal transmitter needs to transmit an LP-SS, it can determine a first root, which can be used to determine the LP-SS. For example, the first root can be used to determine the ZC sequence (i.e., the ZC sequence corresponding to the first root), and the ZC sequence can be used to determine the LP-SS (i.e., the LP-SS corresponding to the ZC sequence). In this embodiment, the LP-SS can be referred to as the first LP-SS, and the ZC sequence can be referred to as the first ZC sequence. The signal transmitter determining the first root can be replaced by: the signal transmitter determining the first ZC sequence.

[0108] For ZC sequences, please refer to Formula 1. When a ZC sequence has a frequency offset, the ZC sequence can be used. express, The following relationship can be satisfied:

[0109]

[0110] In Formula 7, Δf represents the frequency offset, for example, Δf is the normalized frequency offset.

[0111] When the ZC sequence has a time offset, the ZC sequence can be used express, The following relationship can be satisfied:

[0112]

[0113] In Formula 8, Δt represents the time offset.

[0114] The following relationship is introduced to determine the equivalent time offset when the ZC sequence has a frequency offset:

[0115] (qΔt-Δf)mod B ZC =0 (Formula 9)

[0116] In Formula 9, mod represents the remainder operation.

[0117] Combining the aforementioned formula, we can obtain:

[0118]

[0119] In Formula 10, c is a constant.

[0120] Based on the formula above, the following relationship can be obtained:

[0121]

[0122] That is, for a ZC sequence, when there is a frequency offset Δf, it is equivalent to the ZC sequence having a time offset Δt.

[0123] Furthermore, this application's embodiments suggest that the time offset caused by the frequency offset can be related to the root of the ZC sequence (denoted by q). For example, with a fixed frequency offset, different q values ​​may correspond to the same or different time offsets. (See reference...) Figure 8A and Figure 8B , Figure 8A This represents the correlation detection result (or coherent demodulation result) of a ZC sequence with a frequency offset of 1 subcarrier spacing (SCS) and q=1. Figure 8B This represents the correlation detection results of a ZC sequence with a frequency offset of 1 subcarrier interval and q=2, where... Figure 8A and Figure 8B We will take a 127-length ZC sequence as an example. Figure 8A and Figure 8B In the graph, the horizontal axis represents time, and the vertical axis represents relevant values. According to... Figure 8A It can be seen that when q=1, the time offset caused by the frequency offset of one subcarrier interval is small, approximately 1, meaning the correlation peak appears approximately at position "1" in the time domain. The time offset of the ZC sequence should be 0, meaning the correlation peak's time offset relative to the true signal is approximately 1. According to... Figure 8B It can be seen that when q=2, the time offset caused by the frequency offset of one subcarrier interval is relatively large, and this time offset is far away from the position where the time offset is 0.

[0124] This application embodiment can define two types of ZC sequences, or define two types of ZC sequence roots. One type of ZC sequence or one type of root can satisfy the following condition: when the frequency offset of the ZC sequence corresponding to the root is less than or equal to a first value, the equivalent time offset of the ZC sequence is greater than a first threshold. For example, q=2 can be such a root, or the ZC sequence with q=2 can be such a ZC sequence. Optionally, such ZC sequences can also be called time-frequency offset sensitive ZC sequences, or they can have other names, without limitation.

[0125] Another type of ZC sequence or another type of root satisfies the following condition: when the frequency offset of the ZC sequence corresponding to the root is less than or equal to a second value, the equivalent time offset of the ZC sequence is less than or equal to a first threshold. For example, q=1 can be this type of root, or the ZC sequence with q=1 can be this type of ZC sequence. Optionally, this type of ZC sequence can also be called a time-frequency offset robust ZC sequence, or it can have other names; there are no restrictions on this.

[0126] For LP-SS, using a time-frequency robust ZC sequence may affect the time-frequency synchronization performance of the signal receiver. When performing time-frequency synchronization based on LP-SS, the LP-SS receiver can perform sliding correlation in both the time and frequency domains. For example, using frequency 1 and performing sliding correlation in the time domain yields one correlation result; using frequency 2 and performing sliding correlation in the time domain yields another correlation result, and so on. The receiver can use multiple frequencies and perform sliding correlation in the time domain to obtain multiple correlation results. The receiver can then determine the detection result based on these multiple correlation results, which may be, for example, a coherent demodulation result. For instance, the receiver can determine the detection result based on the correlation peaks corresponding to the multiple correlation results.

[0127] Please refer to Figure 9 Here are examples of multiple related results corresponding to LP-SS. Figure 9 Taking three relevant results as examples, respectively using Figure 9 The three rectangles represent this. Figure 9 The horizontal axis represents time, and the vertical axis represents frequency. Figure 9 In the middle, with q=1 and B ZC =127, with frequency offset and time offset both set to 0. The correct detection result should be frequency offset 0 and time offset 0 (i.e., Figure 9The three correlation results (corresponding to the middle rectangle) should ideally correspond to only one correlation peak. However, due to the introduction of frequency offset during detection, correlation peaks appear at positions with time offset of -1 and frequency offset of +1, and at positions with time offset of +1 and frequency offset of -1. Since the ZC sequence used is time-frequency offset robust, the time offset caused by the frequency offset is relatively small. Therefore, all three correlation peaks fall within the time-domain sliding range of the detection window. This makes it impossible for the signal receiver to determine which correlation peak represents the actual received LP-SS, thus preventing the acquisition of accurate time offset, frequency offset, and other information.

[0128] Therefore, embodiments of this application can select a time-frequency biased ZC sequence for the LP-SS to improve the time-frequency synchronization performance of the signal receiver for the LP-SS. Please refer to... Figure 10 Here are examples of multiple related results corresponding to LP-SS. Figure 10 Let's take three relevant results as an example. Figure 10 The horizontal axis represents time, and the vertical axis represents frequency. Figure 10 In the middle, with q=5 and B ZC =127, with frequency offset and time offset both set to 0, as an example. Wherein, Figure 10 The three correlation results also correspond to three correlation peaks. However, because the ZC sequence used is a time-frequency bias-sensitive ZC sequence, the time bias caused by the frequency bias is relatively large. Therefore, the time-domain distance between the correlation peaks of each correlation result is large, and the two correlation peaks corresponding to two of the correlation results fall outside the time-domain sliding range of the detection window. The correlation peaks that fall within the time-domain sliding range of the detection window are the correlation peaks with zero frequency bias and zero time bias, which are the correct detection results. It can be seen that using a time-frequency bias-sensitive ZC sequence can obtain more accurate information such as time bias and frequency bias.

[0129] Based on the above analysis, optionally, the first root determined by the signal transmitter can be the root of a time-frequency biased ZC sequence, or the signal transmitter can determine a time-frequency biased first ZC sequence as the ZC sequence for determining the first LP-SS. For example, the first root can satisfy the following condition: when the frequency offset of the LP-SS corresponding to the first root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS can be greater than a first threshold. In various embodiments of this application, the equivalent time-domain offset can be understood as the time-domain offset introduced (or caused) by the frequency offset. The first value can be predefined by the protocol or configured by the network device. The first threshold can be predefined by the protocol or configured by the network device. Optionally, the first threshold can be greater than or equal to the time-domain sliding range of the first detection window, and the first detection window can be used to detect the first LP-SS. The first threshold being greater than or equal to the time-domain sliding range of the first detection window can make the time-domain distance between the correlation peak caused by frequency offset and the correlation peak of the actual signal larger. For example, the correlation peak caused by frequency offset may fall outside the time-domain sliding range of the first detection window, while within the time-domain sliding range of the first detection window there may only be the correlation peak of the actual signal. This reduces the probability of false detection at the signal receiver and improves the time-frequency synchronization performance.

[0130] Optionally, the first root can belong to the first root set. The first root set can be predefined by the protocol or set by the network device.

[0131] The first root set may include, for example, roots applicable to LP-SS, or, for example, roots corresponding to time-frequency biased ZC sequences. For instance, any one of at least one roots in the first root set may satisfy the following: when the frequency offset of the ZC sequence corresponding to that root is less than or equal to a first value, the equivalent time-domain offset of the ZC sequence is greater than a first threshold. Wherein, if the time-frequency biased ZC sequence can be used to generate LP-SS, then any one of those roots may also satisfy the following: when the frequency offset of the LP-SS corresponding to that root is less than or equal to the first value, the equivalent time-domain offset of the LP-SS is greater than the first threshold. This can also be understood as the at least one root being a root corresponding to a time-frequency biased ZC sequence. The at least one root may be, for example, some or all of the roots in the first root set.

[0132] Optionally, the first root set may satisfy one or more of the following: when the length of the first ZC sequence is 23, the first root set may include at least one of 5, 7, 9, and 14; when the length of the first ZC sequence is 29, the first root set may include at least one of 5, 6, 7, 8, 12, and 17; when the length of the first ZC sequence is 31, the first root set may include at least one of 5, 6, 12, 13, 18, and 19; when the length of the first ZC sequence is 53, the first root set may include at least one of 5, 6, 12, 16, 24, and 29; when the length of the first ZC sequence is 59, the first root set may include at least one of 5, 6, 16, 18, 27, and 32; when the length of the first ZC sequence is 61, the first root set may include at least one of 5, 11, 22, 28, 33, and 39; or, when the length of the first ZC sequence is 127, the first root set may include at least one of 5, 11, 22, 33, 37, and 44. The roots in one or more of these items can be the roots corresponding to time-frequency biased ZC sequences. For example, the first set of roots can be presented in tabular form, as shown in Table 1.

[0133] Table 1

[0134]

[0135]

[0136] In this context, each row of Table 1 is considered an item, and the first root set can include one or more items from Table 1. For any item, the first root set can further include one or more roots from that item.

[0137] Optionally, the first root set may only include roots corresponding to time-frequency biased ZC sequences, excluding other roots. Alternatively, the first root set may include roots corresponding to time-frequency biased ZC sequences in addition to those corresponding to time-frequency biased ZC sequences, such as roots corresponding to time-frequency biased robust ZC sequences. For example, the first root set may also include a second root, which satisfies the following condition: when the frequency offset of the ZC sequence corresponding to the second root is less than or equal to a second value, the equivalent time-domain offset of the ZC sequence is less than or equal to a second threshold. For example, the second root may be a root corresponding to a time-frequency biased robust ZC sequence. Optionally, the second root can be used to generate LP-WUS. For example, if a time-frequency biased robust ZC sequence can be used to generate LP-WUS, then the second root may also satisfy the following condition: when the frequency offset of the LP-WUS corresponding to the second root is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold. The second value may be predefined by the protocol or configured by the network device. The second threshold may be predefined by the protocol or configured by the network device. Features such as the second value and the second threshold will be described in the next embodiment. The first value and the second value can be the same or different; the first threshold and the second threshold can be the same or different.

[0138] Optionally, the first root set may also satisfy one or more of the following: when the length of the first ZC sequence is 23, the first root set further includes at least one of 1, 6, 8, 11, 12, 15, 17, 22; when the length of the first ZC sequence is 29, the first root set further includes at least one of 1, 10, 14, 15, 19, 22, 28; when the length of the first ZC sequence is 31, the first root set further includes at least one of 1, 8, 10, 15, 16, 21, 23, 30; when the length of the first ZC sequence is 53, the first root set... The first root set also includes at least one of 1, 13, 18, 26, 27, 35, 40, and 52; when the length of the first ZC sequence is 59, the first root set also includes at least one of 1, 15, 20, 29, 30, 39, 44, and 58; when the length of the first ZC sequence is 61, the first root set also includes at least one of 1, 15, 20, 30, 31, 41, 46, and 60; or, when the length of the first ZC sequence is 127, the first root set also includes at least one of 1, 32, 42, 63, 64, 85, 95, and 126. The roots in one or more of these items can be the roots corresponding to time-frequency robust ZC sequences. For example, the first root set can be presented in tabular form, see Table 2 or Table 3.

[0139] Table 2

[0140]

[0141] Table 3

[0142]

[0143]

[0144] Table 2 mixes the roots corresponding to time-frequency biased ZC sequences and the roots corresponding to time-frequency biased robust ZC sequences without distinction. Alternatively, the first root set may also include set A and set B, where set A includes roots corresponding to time-frequency biased ZC sequences, or roots used for LP-SS; set B includes roots corresponding to time-frequency biased robust ZC sequences, or roots used for LP-WUS, as shown in Table 3. In Table 3, for example, set A is used for LP-SS, and set B is used for LP-WUS. This application does not limit the implementation form of the first root set.

[0145] It should be understood that when the length of the first ZC sequence is 29, root 7 can be used as the root corresponding to a time-frequency bias-sensitive ZC sequence or a time-frequency bias-robust ZC sequence. For example, root 7 can be used for LP-SS or LP-WUS. In the embodiments of this application (e.g., Tables 2 and 3), root 7 is used as the root corresponding to a time-frequency bias-robust ZC sequence, but this application is not limited to this.

[0146] Optionally, the first root set can also be used for LP-WUS if it includes roots corresponding to time-frequency robust ZC sequences. For example, if the signal transmitter wants to generate LP-WUS, it can also select the corresponding roots from the first root set.

[0147] For the signal transmitter, the first root can be determined from the first set of roots. For example, if the signal transmitter is a network device, then the first root can be determined from the first set of roots.

[0148] The signal transmitter can determine the first root from the first root set in several ways. For example, one method involves the signal transmitter randomly selecting any root from the first root set as the first root and informing the receiver of the selected first root via signaling.

[0149] Alternatively, another method for the signal transmitter to determine the first root from the first root set includes determining the first root from the first root set based on the identifier of the cell transmitting the first LP-SS. The cell transmitting the first signal is, for example, called the first cell. The first cell may correspond to one or more identifiers. The signal transmitter can determine the first root based on one or more of these identifiers. For example, if LP-SS is transmitted in the first cell, the identifier of the first cell is the first identifier, which can also be called the LP-SS identifier; while if a non-low-power signal or a signal transmitted to the main radio (MR) of the UE is transmitted in the first cell, the identifier of the first cell is the second identifier. Then, the signal transmitter can determine the first root from the first root set based on the first identifier and / or the second identifier of the first cell. For example, the first root set includes N... root There are N roots. root For a positive integer, the first root can satisfy the following relationship:

[0150]

[0151] In formula 11, The identifier represents the first cell, where I represents the first root, or the index of the first root in the first root set.

[0152] Alternatively, another way for the signal transmitter to determine the first root from the first root set includes that the signal transmitter determines the first root from the first root set based on the time unit in which the first LP-SS is located. The time unit in which the first LP-SS is located can also be understood as the time unit used to transmit the first LP-SS, for example, referred to as the first time unit. For example, the signal transmitter can determine the first root based on the index of the first time unit. For example, for different time units, ZC sequences corresponding to different roots can be used. Then, when determining the first root, the signal transmitter can combine the first time unit occupied by the first signal, for example, by combining the index of the first time unit. For example, the first root can satisfy the following relationship:

[0153] I = f SH (n slot )(Formula 12)

[0154] Where I represents the first root, and n slot This represents the index of the time unit occupied by the first LP-SS. For example, one implementation of Equation 12 is as follows:

[0155]

[0156] In Formula 13, c(i) represents a pseudo-random sequence, and l is the number of the orthogonal frequency division multiplexing (OFDM) symbol containing the first LP-SS in a time slot. This indicates the number of a time slot within a data frame. This indicates the number of OFDM symbols contained in a time slot.

[0157] Alternatively, in addition to the above methods, the signal transmitter may also determine the first root from the first root set in other ways, without any restrictions.

[0158] Alternatively, the first root can be determined by the signal transmitter based on signaling from other devices. For example, if the signal transmitter is UE1 and the receiver of the first LP-SS (referred to as the signal receiver) is UE2, UE1 can determine the first root based on signaling from a network device (e.g., a network device providing services to UE1). For instance, the network device can send a first signaling message to UE1, which can indicate the first root, thus allowing UE1 to determine the first root. The first signaling message can be, for example, downlink control information (DCI), media access control (MAC) control element (CE), or radio resource control (RRC) signaling, etc., without limitation.

[0159] The statement "The first root belongs to the first root set" can be replaced with: "The first ZC sequence belongs to the first ZC sequence set." It should be understood that the above description of the first root set applies to the first ZC sequence set; that is, the first ZC sequence set includes the ZC sequences corresponding to the roots described above as belonging to the first root set. For example, "The first root set includes roots applicable to LP-SS," or "The first root set includes roots corresponding to time-frequency sensitive ZC sequences," can be replaced with: "The first ZC sequence set includes ZC sequences applicable to LP-SS," or "The first ZC sequence set includes time-frequency sensitive ZC sequences."

[0160] S702, the signal transmitting end transmits the first LP-SS. Correspondingly, the signal receiving end receives the first LP-SS.

[0161] The signal receiver can also determine the first root, as described in S703. Optionally, the signal receiver can determine the first root before S702. For example, the signal receiver can determine the first root based on signaling from the signal transmitter. For instance, if the signal transmitter is a network device and the signal receiver is a UE, the network device can send signaling to the UE, which can indicate the first root, thus allowing the UE to determine the first root. Another example is if the signal transmitter is UE1 and the signal receiver is UE2, UE1 can send signaling to UE2, which can indicate the first root, thus allowing UE2 to determine the first root. Similar to S701, the signal receiver determining the first root can be replaced by: the signal receiver determining the first ZC sequence.

[0162] Alternatively, the signal receiver can also determine the first root based on signaling from other devices. For example, if the signal sender is UE1 and the signal receiver is UE2, a network device (e.g., a network device providing services to UE2) can send signaling to UE2, which can indicate the first root, thus allowing UE2 to determine the first root.

[0163] Alternatively, the signal receiver can determine the first root in other ways. For example, the signal receiver can determine the first root from the first root set based on the identifier of the cell transmitting the first LP-SS. Or, the signal receiver can determine the first root from the first root set based on the time unit in which the first LP-SS occurs. Optionally, the signal transmitter and the signal receiver can determine the first root in the same way, so that the roots determined by the signal receiver and the signal transmitter are the same.

[0164] If the signal receiver determines the first root based on signaling, it does not need to know the first root set. Alternatively, the signal receiver can also know the first root set; for example, it can obtain predefined protocol information to determine the first root set, or it can receive information from network devices to determine the first root set. The signal receiver can determine the ZC sequence corresponding to some or all of the roots in the first root set, so that after receiving the first LP-SS, it can directly perform coherent demodulation on the first LP-SS based on the local ZC sequence, reducing the processing latency of the first LP-SS.

[0165] The signal receiver receives the first LP-SS and can perform coherent demodulation on the first LP-SS according to the local ZC sequence (the ZC sequence corresponding to the first root). For the specific coherent demodulation process, please refer to the previous introduction.

[0166] In summary, this embodiment considers that the time-domain offset of the correlation peak is related to the root of the ZC sequence, and the root of the ZC sequence may affect the position of the correlation peak. Therefore, this embodiment can select a suitable root for signals using ZC sequences. For example, for a first LP-SS, the first root can be selected. If the ZC sequence using the first root has a frequency offset, the resulting time-domain offset will be large. When the receiver of the first LP-SS performs coherent demodulation on the first LP-SS, although it may obtain multiple correlation peaks, due to the characteristics of the first root, the time-domain interval between each correlation peak is large. For example, only the correlation peak corresponding to the real signal may fall within the detection window range. Therefore, the signal receiver can successfully demodulate, improving the demodulation success rate of the first LP-SS.

[0167] This application provides another communication method. Please refer to... Figure 11 Here is a flowchart of the method.

[0168] S1101, The signal transmitting end determines the third root.

[0169] When the signal transmitter needs to transmit LP-WUS, it can determine a third root, which can be used to determine the LP-WUS. For example, the third root can be used to determine the ZC sequence (i.e., the ZC sequence corresponding to the third root), and the ZC sequence can be used to determine the LP-WUS (i.e., the LP-WUS corresponding to the ZC sequence). In this embodiment, the LP-WUS can be referred to as the first LP-WUS, and the ZC sequence as the second ZC sequence. The signal transmitter determining the third root can be replaced by the signal transmitter determining the second ZC sequence.

[0170] For ZC sequences, the presence of a frequency offset Δf is equivalent to a time offset Δt. Furthermore, the time offset resulting from the frequency offset can be related to the root of the ZC sequence (denoted by q). Therefore, embodiments of this application can define two types of ZC sequences, or define the roots of two types of ZC sequences. For a detailed explanation, please refer to [link to relevant documentation]. Figure 7 The example shown.

[0171] For LP-WUS, using a time-frequency sensitive ZC sequence may affect the detection performance of the signal receiver. Specifically, when detecting LP-WUS (e.g., coherent demodulation), the LP-SS signal receiver can perform sliding correlation in the time domain instead of in the frequency domain. Optionally, if LP-WUS transmits information via cyclic shift, the signal receiver can perform cyclic shift detection to determine the information transmitted via cyclic shift. As one implementation, the receiver can sequentially perform sequence correlation between a pre-defined cyclic shift sequence and the ZC sequence corresponding to the received LP-WUS, and determine the cyclic shift with the highest correlation value as the cyclic shift used by the received ZC sequence.

[0172] Please refer to Figure 12 Here are examples of relevant results for LP-WUS. Figure 12 This includes four related results, each corresponding to one of four cyclic shifts (e.g., cyclic shifts 0 to cyclic shift 3). Figure 12 (represented as CS0~CS3). Figure 12 The horizontal axis represents frequency, and the vertical axis represents correlation value. Figure 12 In this example, let's take q=2. According to... Figure 12 It is evident that as the frequency offset of the ZC sequence gradually increases, reaching approximately one part per million (ppm), the correlation value of the ZC sequence corresponding to cyclic shift 2 is at its maximum. If the LP-WUS actually transmitted by the signal transmitter corresponds to a ZC sequence with cyclic shift 0, but the signal receiver introduces a frequency offset greater than or equal to 3 ppm during detection, the correlation value between the cyclic shift 2 ZC sequence and the received ZC sequence is maximized. Therefore, the signal receiver will perceive that the signal transmitter has transmitted a cyclic shift 2 ZC sequence. This indicates a false detection at the signal receiver.

[0173] Therefore, in the embodiments of this application, a time-frequency bias-robust ZC sequence can be selected for LP-WUS to improve the detection accuracy of LP-WUS at the signal receiver.

[0174] Please refer to Figure 13 Here are examples of relevant results for LP-WUS. Figure 13 This includes four related results, each corresponding to one of four cyclic shifts (e.g., cyclic shifts 0 to cyclic shift 3). Figure 13 (represented as CS0~CS3). Figure 13 The horizontal axis represents frequency, and the vertical axis represents correlation value. Figure 13 In this example, q=1 is taken, and the ZC sequence corresponding to cyclic shift 0 of LP-WUS transmitted by the signal transmitter is taken as an example. According to Figure 13 It is evident that regardless of the frequency offset of the ZC sequence, the correlation value corresponding to the cyclic shift sequence (e.g., the ZC sequence with cyclic shift of 0) sent by the signal transmitter is always the largest. That is, the probability of the signal receiver making a misjudgment is small, and the correct detection result can be obtained.

[0175] Based on the above analysis, optionally, the third root determined by the signal transmitter can be the root of a time-frequency offset robust ZC sequence, or the signal transmitter can determine a time-frequency offset robust second ZC sequence as the ZC sequence for determining the first LP-WUS. For example, the third root can satisfy the following condition: when the frequency offset of the LP-WUS corresponding to the third root is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS can be less than or equal to a second threshold. The second value can be predefined by the protocol or configured by the network device. The second threshold can be predefined by the protocol or configured by the network device. Optionally, the second threshold can be greater than or equal to the time-domain sliding range of the second detection window, which can be used to detect the first LP-WUS.

[0176] Optionally, the third root can belong to the second root set. The second root set can be predefined by the protocol or set by the network device.

[0177] The second root set may include, for example, roots applicable to LP-WUS, or, for example, roots corresponding to time-frequency robust ZC sequences. For instance, any one of at least one roots in the second root set may satisfy the following: when the frequency offset of the ZC sequence corresponding to that root is less than or equal to a second value, the equivalent time-domain offset of the ZC sequence is less than or equal to a second threshold. Where a time-frequency robust ZC sequence can be used to generate LP-WUS, then that root may also satisfy the following: when the frequency offset of the LP-WUS corresponding to that root is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold. This can also be understood as the at least one root being a root corresponding to a time-frequency robust ZC sequence. The at least one root may be, for example, some or all of the roots in the second root set.

[0178] Optionally, the second root set may satisfy one or more of the following: when the length of the second ZC sequence is 23, the second root set includes at least one of 1, 6, 8, 11, 12, 15, 17, 22; when the length of the second ZC sequence is 29, the second root set includes at least one of 1, 7, 10, 14, 15, 19, 22, 28; when the length of the second ZC sequence is 31, the second root set includes at least one of 1, 8, 10, 15, 16, 21, 23, 30; when the length of the second ZC sequence is 53, the second root set includes at least one of 1, 13, 18, 26, 27, 35, 40, 52; when the length of the second ZC sequence is 59, the second root set includes 1, 15, 20, 29, 30, 39, 44.

[0179] The second root set includes at least one of the following: 58; when the length of the second ZC sequence is 61, the second root set includes at least one of 1, 15, 20, 30, 31, 41, 46, and 60; or, when the length of the second ZC sequence is 127, the second root set includes at least one of 1, 32, 42, 63, 64, 85, 95, and 126. The roots in one or more of these terms can be roots corresponding to time-frequency robust ZC sequences. For example, the second root set can be presented in tabular form, see Table 4.

[0180] Table 4

[0181]

[0182]

[0183] In this context, each row of Table 4 is considered an item, and the second root set can include one or more items from Table 4. For any item, the second root set can further include one or more roots from that item.

[0184] Optionally, the second root set may only include roots corresponding to time-frequency bias-robust ZC sequences, excluding other roots. Alternatively, the second root set may include roots corresponding to time-frequency bias-robust ZC sequences, as well as other roots, such as roots corresponding to time-frequency bias-sensitive ZC sequences. For example, the second root set may also include a fourth root, which satisfies the following condition: when the frequency offset of the ZC sequence corresponding to the fourth root is less than or equal to a first value, the equivalent time-domain offset of the ZC sequence is greater than a first threshold. For example, the fourth root may be a root corresponding to a time-frequency bias-sensitive ZC sequence. Optionally, the fourth root can be used to generate LP-SS. For example, if a time-frequency bias-robust ZC sequence can be used to generate LP-SS, then the fourth root may also satisfy the following condition: when the frequency offset of the LP-SS corresponding to the fourth root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS is greater than a first threshold. The first value may be predefined by the protocol or configured by the network device. The first threshold may be predefined by the protocol or configured by the network device. For information on the first value, first threshold, and other characteristics, please refer to [reference needed]. Figure 7 The illustrated embodiment is described below. The first value and the second value may be the same or different; the first threshold and the second threshold may be the same or different.

[0185] Optionally, the second root set may also satisfy one or more of the following: when the length of the second ZC sequence is 23, the second root set may also include at least one of 5, 7, 9, and 14; when the length of the second ZC sequence is 29, the second root set may also include at least one of 5, 6, 8, 12, and 17; when the length of the second ZC sequence is 31, the second root set may also include at least one of 5, 6, 12, 13, 18, and 19; when the length of the second ZC sequence is 53, the second root set may also include at least one of 5, 6, 12, 16, 24, and 29; when the length of the second ZC sequence is 59, the second root set may also include at least one of 5, 6, 16, 18, 27, and 32; when the length of the second ZC sequence is 61, the second root set may also include at least one of 5, 11, 22, 28, 33, and 39; or, when the length of the second ZC sequence is 127, the second root set may also include at least one of 5, 11, 22, 33, 37, and 44. The roots in one or more of these items can be roots corresponding to time-frequency biased ZC sequences. For example, the second set of roots can be presented in tabular form, as shown in the reference. Figure 7 Table 2 in the illustrated embodiment is also described in the following description. Figure 7 The example shown.

[0186] As mentioned above, when the length of the second ZC sequence is 29, root 7 can be used as the root corresponding to both time-frequency biased and time-frequency biased ZC sequences. Table 4 uses root 7 as an example of the root corresponding to a time-frequency biased and time-frequency biased ZC sequence, but this application is not limited to this.

[0187] If the second root set also includes roots corresponding to time-frequency biased ZC sequences, optionally, the second root set can also be used for LP-SS. For example, if the signal transmitter wants to generate LP-SS, it can also select the corresponding roots from the second root set.

[0188] For the signal transmitter, the third root can be determined from the second root set. For example, if the signal transmitter is a network device, it can determine the third root from the second root set. For details on how the signal transmitter determines the third root from the second root set, please refer to [link to relevant documentation]. Figure 7 The illustrated embodiment provides an explanation of how the signal transmitter determines the first root from the first root set.

[0189] Alternatively, from the signal transmitting end's perspective, the third root can also be determined based on signaling from other devices; this can also be referenced. Figure 7 The illustrated embodiments are described below.

[0190] The statement that the third root belongs to the second root set can be replaced with: the second ZC sequence belongs to the second ZC sequence set. It should be understood that the above description of the third root set applies to the second ZC sequence set; that is, the second ZC sequence set includes the ZC sequences corresponding to the roots described above as belonging to the second root set. For example, the statement that the second root set includes roots applicable to LP-WUS, or that the second root set includes roots corresponding to time-frequency robust ZC sequences, can be replaced with: the second ZC sequence set includes ZC sequences applicable to LP-WUS, or the second ZC sequence set includes time-frequency robust ZC sequences.

[0191] S1102, The signal transmitting end transmits the first LP-WUS. Correspondingly, the signal receiving end receives the first LP-WUS.

[0192] The signal receiver can also determine the third root, as described in S1103. Optionally, the signal receiver can determine the third root before S1102. For example, the signal receiver can determine the third root based on the signaling from the signal transmitter, or it can determine the third root based on the signaling from other devices, or it can determine the third root using other methods, as described in [reference needed]. Figure 7 The illustrated embodiment describes the process of the signal receiver determining the first root. Additionally, similar to S1101, the determination of the third root by the signal receiver can be replaced by the determination of the second ZC sequence by the signal receiver.

[0193] If the signal receiver determines the third root based on signaling, it does not need to know the second root set. Alternatively, the signal receiver can also know the second root set; for example, it can obtain predefined protocol information to determine the second root set, or it can receive information from the network device to determine the second root set. The signal receiver can determine the ZC sequence corresponding to some or all of the roots in the second root set, and thus, after receiving the first LP-WUS, it can directly perform coherent demodulation on the first LP-WUS based on the local ZC sequence, reducing the processing latency of the first LP-WUS.

[0194] The signal receiver receives the first LP-WUS and can perform coherent demodulation on the first LP-WUS according to the local ZC sequence (the ZC sequence corresponding to the third root). The specific coherent demodulation process can be referred to the previous introduction.

[0195] In summary, this embodiment considers that the time-domain offset of the correlation peak is related to the root of the ZC sequence, and the root of the ZC sequence may affect the position of the correlation peak. Therefore, this embodiment can select a suitable root for signals using ZC sequences. For example, for the first LP-WUS, a third root can be selected. If the ZC sequence using the third root has a frequency offset, the resulting time-domain offset will be smaller. When the receiver of the first LP-WUS performs coherent demodulation on the first LP-WUS, the correlation value corresponding to the real signal can always be maximized. Therefore, the signal receiver can successfully demodulate, improving the demodulation success rate of the first LP-WUS.

[0196] This application provides yet another communication method. Please refer to... Figure 14 Here is a flowchart of the method.

[0197] S1401, The signal transmitting end sends the second LP-SS. Correspondingly, the signal receiving end receives the second LP-SS.

[0198] The second LP-SS may include M modulation symbols, where M is a positive integer. Of these M modulation symbols, N modulation symbols may indicate a third value, and the remaining M and N modulation symbols may indicate a fourth value, where N is a positive integer less than or equal to M. The modulation scheme corresponding to the second LP-SS is, for example, OOK modulation. Optionally, the third value may be, for example, "1" or "on", and the fourth value may be, for example, "0" or "off".

[0199] The N modulation symbols can correspond to N ZC sequences. For example, one modulation symbol can be mapped to one ZC sequence, therefore N modulation symbols can be mapped to N ZC sequences, and there is a one-to-one correspondence between the N modulation symbols and the N ZC sequences. The N ZC sequences can correspond to N roots, and there is a one-to-one correspondence between the N roots and the N ZC sequences. Among the N roots, at least two roots can be different, thereby improving the time-frequency synchronization performance of the signal receiver for the first LP-SS.

[0200] Optionally, any two of the N roots can be different, or all of the N roots can be different, thereby further improving the time-frequency synchronization performance of the signal receiver for the second LP-SS.

[0201] Optionally, any one of the N roots can be a root corresponding to a time-frequency bias-robust ZC sequence. Alternatively, any one of the N roots can satisfy the following: when the frequency offset of the ZC sequence corresponding to that root is less than or equal to a second value, the equivalent time-domain offset of the ZC sequence can be less than or equal to a second threshold. Wherein, the time-frequency bias-robust ZC sequence can be used to generate LP-WUS, then any one of the roots can also satisfy the following: when the frequency offset of the LP-WUS corresponding to that root is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold. This can also be understood as at least one root being a root corresponding to a time-frequency bias-robust ZC sequence.

[0202] Alternatively, the types of the N roots can be unrestricted. For example, the N roots can include one or more of the following: roots corresponding to time-frequency bias-robust ZC sequences, roots corresponding to time-frequency bias-sensitive ZC sequences, or other roots. For example, a root corresponding to a time-frequency bias-sensitive ZC sequence satisfies the following condition: when the frequency offset of the ZC sequence corresponding to that root is less than or equal to a first value, the equivalent time-domain offset of that ZC sequence can be greater than a first threshold. Since a time-frequency bias-sensitive ZC sequence can be used to generate an LP-SS, the root can also satisfy the following condition: when the frequency offset of the LP-SS corresponding to that root is less than or equal to a first value, the equivalent time-domain offset of that LP-SS is greater than a first threshold. For more information, please refer to [link to relevant documentation]. Figure 7 or Figure 11 The example shown.

[0203] These N roots, for example, belong to the third root set. Optionally, the third root set may satisfy one or more of the following: when the length of the ZC sequence is 23, the second root set includes at least one of 1, 6, 8, 11, 12, 15, 17, 22; when the length of the ZC sequence is 29, the third root set includes at least one of 1, 7, 10, 14, 15, 19, 22, 28; when the length of the ZC sequence is 31, the third root set includes at least one of 1, 8, 10, 15, 16, 21, 23, 30; when the length of the ZC sequence is 53, the third root set includes 1, 13, ...

[0204] At least one of 18, 26, 27, 35, 40, and 52; when the length of the ZC sequence is 59, the third root set includes 1, 15, 20, and 29.

[0205] At least one of 30, 39, 44, and 58; when the length of the ZC sequence is 61, the third root set includes 1, 15, 20, 30, 31, and 41.

[0206] At least one of 46 and 60; or, when the length of the ZC sequence is 127, the third root set includes 1, 32, 42, 63, 64, 85, 95,

[0207] At least one of 126. The roots in one or more of these terms can be roots corresponding to time-frequency partially robust ZC sequences. For example, the third set of roots can be presented in tabular form; see reference for details. Figure 11 Table 4 in the illustrated embodiment.

[0208] If the types of the N roots are not restricted, the third root set may optionally also satisfy one or more of the following: when the length of the ZC sequence is 23, the third root set may also include at least one of 5, 7, 9, and 14; when the length of the ZC sequence is 29, the third root set may also include at least one of 5, 6, 8, 12, and 17; when the length of the ZC sequence is 31, the third root set may also include at least one of 5, 6, 12, 13, 18, and 19; when the length of the ZC sequence is 53... The third root set may also include at least one of 5, 6, 12, 16, 24, and 29; when the length of the ZC sequence is 59, the third root set may also include at least one of 5, 6, 16, 18, 27, and 32; when the length of the ZC sequence is 61, the third root set may also include at least one of 5, 11, 22, 28, 33, and 39; or, when the length of the ZC sequence is 127, the third root set may also include at least one of 5, 11, 22, 33, 37, and 44. The roots in one or more of these items may correspond to roots of time-frequency biased ZC sequences. For example, the third root set can be presented in tabular form, see reference. Figure 7 Table 2 or Table 3 in the illustrated embodiments; further details regarding Table 2 or Table 3 may also be found in the provided text. Figure 7 The example shown.

[0209] Additionally, if the types of the N roots are not restricted, the third root set may optionally include roots other than those corresponding to time-frequency biased ZC sequences and time-frequency biased robust ZC sequences, without any restrictions.

[0210] As mentioned earlier, when the length of the ZC sequence is 29, the root 7 can be used as the root corresponding to the time-frequency biased ZC sequence, or as the root corresponding to the time-frequency biased robust ZC sequence.

[0211] For the signal transmitter, N roots can be determined from the third root set. For example, if the signal transmitter is a network device, then it can determine N roots from the third root set. For details on how the signal transmitter determines N roots from the third root set, please refer to [link to relevant documentation]. Figure 7 The illustrated embodiment describes how the signal transmitter determines the first root.

[0212] Alternatively, from the signal transmitting end's perspective, N roots can also be determined based on signaling from other devices; this can also be referenced. Figure 7 Description of the illustrated embodiments.

[0213] The signal receiver can determine N roots based on the signaling from the signal transmitter, or it can determine N roots based on the signaling from other devices, or it can determine N roots using other methods. For more information, please refer to [link / reference needed]. Figure 7 The illustrated embodiment provides a description of how the signal receiver determines the first root.

[0214] If the signal receiver determines N roots based on signaling, it does not need to know the third root set. Alternatively, the signal receiver can also know the third root set; for example, it can obtain predefined protocol information to determine the third root set, or it can receive information from network devices to determine the third root set. The signal receiver can determine the ZC sequences corresponding to some or all of the roots in the third root set, and thus, after receiving the second LP-SS, it can directly perform coherent demodulation on the second LP-SS based on the local ZC sequence, reducing the processing latency of the second LP-SS.

[0215] The signal receiver receives the second LP-SS and can perform coherent demodulation on the signals on the M modulation symbols included in the second LP-SS according to the local ZC sequence (N ZC sequences corresponding to N roots). The specific coherent demodulation process can be referred to the previous introduction.

[0216] Please refer to Figures 15A-15C Here are some examples of coherent demodulation results from the signal receiver. Figures 15A-15C The results are coherent demodulations for different LP-SS. Figure 15A Here is an example of multiple related results corresponding to one LP-SS. Figure 15A Taking three relevant results as an example, these three relevant results correspond to Figure 15A The rectangle is divided into three parts: top, middle, and bottom. Figure 15A The horizontal axis represents time, and the vertical axis represents frequency. Figure 15A In this example, the signal transmitter sends an LP-SS with a frequency offset of 0 and a time offset of 0. The correct detection result should be a frequency offset of 0 and a time offset of 0 (i.e., Figure 15AThe three correlation results (corresponding to the middle rectangle) should ideally correspond to only one correlation peak. However, due to the introduction of frequency offset during the detection process, correlation peaks appeared at the following positions: time offset -2.5, frequency offset -1; time offset +1, frequency offset -1; time offset 4, frequency offset -1; time offset -4, frequency offset 1; time offset -1, frequency offset 1; and time offset 2, frequency offset 1. Among these, the correlation values ​​at the positions of time offset -2.5, frequency offset +1; time offset +1, frequency offset -1; time offset 4, frequency offset -1; time offset -4, frequency offset 1; time offset -1, frequency offset 1; and time offset 2, frequency offset 1 are not superimposed, resulting in smaller peak values. Figure 15A The correlation peak shown at the position with 0 time offset and 0 frequency offset is actually the result of multiple correlation values ​​being superimposed, hence the relatively large peak value. Therefore, the signal receiver can determine that this correlation peak corresponds to the received LP-SS. It is evident that ensuring at least two of the N roots corresponding to LP-SS are different can improve the detection accuracy of the signal receiver.

[0217] Figure 15B Here is an example of multiple related results corresponding to another LP-SS. Figure 15B Taking three relevant results as an example, these three relevant results correspond to Figure 15B The rectangle is divided into three parts: top, middle, and bottom. Figure 15B The horizontal axis represents time, and the vertical axis represents frequency. Figure 15B In this example, the signal transmitter sends an LP-SS with a frequency offset of 1 subcarrier interval and a time offset of 0. The correct detection result should be a frequency offset of 1 subcarrier interval and a time offset of 0 (i.e., Figure 15B The rectangle below corresponds to the relevant results, meaning these three relevant results should ideally correspond to only one relevant peak. However, due to the introduction of frequency offset during the detection process, relevant peaks appeared at the following positions: time offset -4, frequency offset -1; time offset +2, frequency offset -1; time offset 8, frequency offset -1; time offset -2, frequency offset 0; time offset +1, frequency offset 0; and time offset 4, frequency offset 0. Among these, the relevant values ​​at the positions of time offset -4, frequency offset -1; time offset +2, frequency offset -1; time offset 8, frequency offset -1; time offset -2, frequency offset 0; time offset +1, frequency offset 0; and time offset 4, frequency offset 0 are not cumulative, resulting in smaller peak values. Figure 15BThe correlation peak shown, located at a time offset of one subcarrier interval and a frequency offset of 0, is actually the result of multiple correlation values ​​being superimposed, hence its relatively large peak value. Therefore, the signal receiver can determine that this correlation peak corresponds to the received LP-SS. It is evident that ensuring at least two of the N roots corresponding to LP-SS are different can improve the time-frequency synchronization performance of the signal receiver.

[0218] Figure 15C This is yet another example of multiple related results corresponding to one LP-SS. Figure 15C Taking three relevant results as an example, these three relevant results correspond to Figure 15C The rectangle is divided into three parts: top, middle, and bottom. Figure 15C The horizontal axis represents time, and the vertical axis represents frequency. Figure 15C In this example, the signal transmitter sends an LP-SS with a frequency offset of -1 subcarrier interval and a time offset of 0. The correct detection result should be a frequency offset of -1 subcarrier interval and a time offset of 0 (i.e., Figure 15C The rectangle above corresponds to the relevant results, meaning these three relevant results should ideally correspond to only one relevant peak. However, due to the introduction of frequency offset during the detection process, relevant peaks appeared at the following positions: time offset -9, frequency offset +1; time offset -2, frequency offset +1; time offset 4, frequency offset +1; time offset -4, frequency offset 0; time offset -1, frequency offset 0; and time offset 2, frequency offset 0. Among these, the relevant values ​​at the positions of time offset -9, frequency offset +1; time offset -2, frequency offset +1; time offset 4, frequency offset +1; time offset -4, frequency offset 0; time offset -1, frequency offset 0; and time offset 2, frequency offset 0 are not cumulative, resulting in smaller peak values. Figure 15C The correlation peak shown at the position with a time offset of -1 subcarrier interval and a frequency offset of 0 is actually the result of multiple correlation values ​​being superimposed, hence the relatively large peak value. Therefore, the signal receiver can determine that this correlation peak corresponds to the correlation peak of the received LP-SS. It is evident that ensuring at least two of the N roots corresponding to LP-SS are different can improve the time-frequency synchronization performance of the signal receiver.

[0219] In summary, the embodiments of this application take into account that the time-domain offset of the correlation peak is related to the root of the ZC sequence, and the root of the ZC sequence may affect the position of the correlation peak. Therefore, the embodiments of this application can select a suitable root for signals using ZC sequences. For example, for the second LP-SS, at least two roots of the N ZC sequences on the N modulation symbols can be different, thereby improving the time-frequency synchronization performance of the signal receiver based on the second LP-SS.

[0220] Figure 16A schematic diagram of a communication device according to an embodiment of this application is provided. The communication device 1600 may be... Figure 7 , Figure 11 ,or Figure 14 The signal transmitting end or its circuit system, as shown in any of the accompanying drawings, is used to implement the method corresponding to the signal transmitting end in the above method embodiments. Alternatively, the communication device 1600 may be... Figure 7 , Figure 11 ,or Figure 14 The signal receiving end or its circuit system, as shown in any of the accompanying drawings, is used to implement the method corresponding to the signal receiving end in the above method embodiments. For example, one type of circuit system is a chip system. The signal transmitting end is, for example, a UE or a network device; the signal receiving end is, for example, a UE or a network device.

[0221] The communication device 1600 includes at least one processor 1601. The processor 1601 can be used for internal processing within the device to implement certain control processing functions. Optionally, the processor 1601 includes instructions. Optionally, the processor 1601 can store data. Optionally, different processors can be independent devices, located in different physical locations, or located on different integrated circuits. Optionally, different processors can be integrated into one or more processors, for example, integrated on one or more integrated circuits.

[0222] Optionally, the communication device 1600 includes one or more memories 1603 for storing instructions. Optionally, the memories 1603 may also store data. The processor and the memories may be separate or integrated together.

[0223] Optionally, the communication device 1600 includes a communication line 1602 and at least one communication interface 1604. Since the memory 1603, communication line 1602, and communication interface 1604 are all optional, therefore... Figure 16 All are represented by dashed lines.

[0224] Optionally, the communication device 1600 may further include a transceiver and / or an antenna. The transceiver can be used to send information to or receive information from other devices. The transceiver may be referred to as a transceiver unit, transceiver circuit, input / output interface, etc., and is used to realize the transmission and reception functions of the communication device 1600 via the antenna. Optionally, the transceiver includes a transmitter and a receiver. For example, the transmitter can be used to generate a radio frequency (RF) signal from a baseband signal, and the receiver can be used to convert the RF signal back into a baseband signal.

[0225] Processor 1601 may include a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs according to the present application.

[0226] Communication line 1602 may include a path for transmitting information between the aforementioned components.

[0227] The communication interface 1604 uses any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area network (WLAN), wired access network, etc.

[0228] Memory 1603 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. Memory 1603 may exist independently and be connected to processor 1601 via communication line 1602. Alternatively, memory 1603 may be integrated with processor 1601.

[0229] The memory 1603 stores computer execution instructions for implementing the scheme of this application, and its execution is controlled by the processor 1601. The processor 1601 executes the computer execution instructions stored in the memory 1603, thereby realizing... Figure 7 , Figure 11 ,or Figure 14 The steps performed by the signal transmitting end in any of the embodiments shown in the accompanying drawings, and / or, Figure 7 , Figure 11 ,or Figure 14The steps performed by the signal receiver in any of the embodiments shown in the accompanying drawings.

[0230] Optionally, the computer execution instructions in the embodiments of this application may also be referred to as application code, and the embodiments of this application do not specifically limit this.

[0231] In a specific implementation, as one example, the processor 1601 may include one or more CPUs, for example... Figure 16 CPU0 and CPU1 in the CPU.

[0232] In a specific implementation, as one example, the communication device 1600 may include multiple processors, such as... Figure 16 Processors 1601 and 1605 are mentioned. Each of these processors can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. Here, "processor" can refer to one or more devices, circuits, and / or processing cores used to process data (such as computer program instructions).

[0233] when Figure 16 When the device shown is a chip, such as a signal transmitting chip or a signal receiving chip, the chip includes a processor 1601 (which may also include a processor 1605), a communication line 1602, and a communication interface 1604. Optionally, it may include a memory 1603. Specifically, the communication interface 1604 may be an input interface, pins, or circuits, etc. The memory 1603 may be a register, cache, etc. The processor 1601 and processor 1605 may be a general-purpose CPU, microprocessor, ASIC, or one or more integrated circuits for controlling the execution of a program that controls the communication method of any of the above embodiments.

[0234] This application embodiment can divide the device into functional modules according to the above method example. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing module. The integrated modules can be implemented in hardware or as software functional modules. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods. For example, when dividing the device into functional modules according to each function, Figure 17 This is a schematic diagram of an apparatus. The apparatus 1700 can be a signal transmitting end or a signal receiving end involved in the above-described method embodiments, or it can be a chip in the signal transmitting end or a chip in the signal receiving end. The apparatus 1700 includes a processing unit 1702 and a transceiver unit 1701.

[0235] It should be understood that the device 1700 can be used to implement the steps performed by the signal transmitting end and / or the signal receiving end in the communication method of the embodiments of this application, and the relevant features can be referred to above. Figure 7 , Figure 11 or Figure 14 The embodiments shown in any of the accompanying drawings will not be described in detail here.

[0236] Optional, Figure 17 The functions / implementation process of the transceiver unit 1701 and the processing unit 1702 can be obtained through Figure 16 The processor 1601 in the memory calls computer execution instructions stored in memory 1603 to implement this. Or, Figure 17 The function / implementation process of the processing unit 1702 in the middle can be achieved through Figure 16 The processor 1601 in the memory calls computer execution instructions stored in memory 1603 to implement this. Figure 17 The function / implementation process of the transceiver unit 1701 can be obtained through Figure 16 It is implemented using the 1604 communication interface.

[0237] Optionally, when the device 1700 is a chip or circuit, the function / implementation process of the transceiver unit 1701 can also be implemented through pins or circuits, etc. Optionally, the transceiver unit 1701 may include a transmitting unit and / or a receiving unit, whereby the transmitting unit implements the transmitting function and the receiving unit implements the receiving function; or, the transceiver unit 1701 may be an integral module capable of implementing both transmitting and / or receiving functions. Optionally, the transceiver unit 1701 can be implemented using a transceiver.

[0238] This application also provides a computer-readable storage medium storing a computer program or instructions. When the computer program or instructions are executed, they implement the methods performed by the signal transmitting end and / or signal receiving end in the aforementioned method embodiments. Thus, the functions described in the above embodiments can be implemented as software functional units and sold or used as independent products. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to it, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0239] This application also provides a computer program product comprising: computer program code, which, when run on a computer, causes the computer to perform the method executed by the signal transmitting end and / or the signal receiving end in any of the foregoing method embodiments.

[0240] This application also provides a processing device, including a processor and an interface; the processor is used to execute the methods performed by the signal transmitting end and / or signal receiving end involved in any of the above method embodiments.

[0241] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0242] The various illustrative logic units and circuits described in the embodiments of this application can be implemented or operate the described functions using a general-purpose processor, digital signal processor (DSP), ASIC, field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor; alternatively, it can be any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented using a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0243] The steps of the methods or algorithms described in the embodiments of this application can be directly embedded in hardware, software units executed by a processor, or a combination of both. The software units can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (EPROM), EEPROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and storage medium can be disposed in an ASIC, which can be disposed in the terminal device. Optionally, the processor and storage medium can also be disposed in different components of the terminal device.

[0244] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0245] The contents of the various embodiments of this application can be referenced to each other. Unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0246] It is understood that in the embodiments of this application, the signal transmitting end and / or the signal receiving end may execute some or all of the steps in the embodiments of this application. These steps or operations are merely examples. In the embodiments of this application, other operations or variations of various operations may also be performed. Furthermore, the steps may be performed in different orders as presented in the embodiments of this application, and it is not necessary to perform all the operations in the embodiments of this application.

Claims

1. A communication method, characterized in that, The method includes: The first root is determined, wherein when the frequency offset of the low-power synchronization signal LP-SS corresponding to the first root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS is greater than a first threshold. Send or receive a first LP-SS, the first LP-SS being determined based on a first ZC sequence, the first ZC sequence being determined based on the first root.

2. The method according to claim 1, characterized in that, The first root belongs to the first root set, where, Any one of the at least one roots in the first root set satisfies the following condition: when the frequency offset of the LP-SS corresponding to the any one root is less than or equal to the first value, the equivalent time-domain offset of the LP-SS is greater than the first threshold.

3. The method according to claim 2, characterized in that, The first set of roots also includes a second root, which satisfies the following condition: when the frequency offset of the low-power wake-up signal LP-WUS corresponding to the second root is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold.

4. The method according to claim 2 or 3, characterized in that, The first root set satisfies one or more of the following: When the length of the first ZC sequence is 23, the first root set includes at least one of 5, 7, 9, and 14; When the length of the first ZC sequence is 29, the first root set includes at least one of 5, 6, 7, 8, 12, and 17; When the length of the first ZC sequence is 31, the first root set includes at least one of 5, 6, 12, 13, 18, and 19; When the length of the first ZC sequence is 53, the first root set includes at least one of 5, 6, 12, 16, 24, and 29; When the length of the first ZC sequence is 59, the first root set includes at least one of 5, 6, 16, 18, 27, and 32; When the length of the first ZC sequence is 61, the first root set includes at least one of 5, 11, 22, 28, 33, and 39; or, When the length of the first ZC sequence is 127, the first root set includes at least one of 5, 11, 22, 33, 37, and 44.

5. The method according to any one of claims 1 to 4, characterized in that, The first root is determined based on the first signaling from the network device; The first root is determined from the first root set based on the identifier of the first cell, which is the cell transmitting the first LP-SS; or, The first root is determined from the first root set according to the index of the first time unit, which is the time unit for transmitting the first LP-SS.

6. The method according to any one of claims 1 to 5, characterized in that, The first threshold is greater than or equal to the time-domain sliding range of the first detection window, which is used to detect the first LP-SS.

7. A communication method, characterized in that, The method includes: Determine the first root, where the first root belongs to the first root set; Send or receive a first LP-SS, the first LP-SS being determined based on a first ZC sequence, the first ZC sequence being determined based on the first root; Wherein, the first root set satisfies one or more of the following: When the length of the first ZC sequence is 23, the first root set includes at least one of 5, 7, 9, and 14; When the length of the first ZC sequence is 29, the first root set includes at least one of 5, 6, 7, 8, 12, and 17; When the length of the first ZC sequence is 31, the first root set includes at least one of 5, 6, 12, 13, 18, and 19; When the length of the first ZC sequence is 53, the first root set includes at least one of 5, 6, 12, 16, 24, and 29; When the length of the first ZC sequence is 59, the first root set includes at least one of 5, 6, 16, 18, 27, and 32; When the length of the first ZC sequence is 61, the first root set includes at least one of 5, 11, 22, 28, 33, and 39; or, When the length of the first ZC sequence is 127, the first root set includes at least one of 5, 11, 22, 33, 37, and 44.

8. The method according to claim 7, characterized in that, The first root is determined based on the first signaling from the network device; The first root is determined from the first root set based on the identifier of the first cell, where the first cell is the cell transmitting the first LP-SS; or, The first root is determined from the first root set according to the index of the first time unit, which is the time unit for transmitting the first LP-SS.

9. The method according to claim 7 or 8, characterized in that, The first root set also satisfies one or more of the following: When the length of the first ZC sequence is 23, the first root set further includes at least one of 1, 6, 8, 11, 12, 15, 17, and 22; When the length of the first ZC sequence is 29, the first root set further includes at least one of 1, 10, 14, 15, 19, 22, and 28; When the length of the first ZC sequence is 31, the first root set further includes at least one of 1, 8, 10, 15, 16, 21, 23, and 30; When the length of the first ZC sequence is 53, the first root set further includes at least one of 1, 13, 18, 26, 27, 35, 40, and 52; When the length of the second ZC sequence is 59, the first root set further includes at least one of 1, 15, 20, 29, 30, 39, 44, and 58; When the length of the first ZC sequence is 61, the first root set further includes at least one of 1, 15, 20, 30, 31, 41, 46, and 60; or, When the length of the first ZC sequence is 127, the first root set also includes at least one of 1, 32, 42, 63, 64, 85, 95, and 126.

10. The method according to claim 9, characterized in that, The first root set is also used for LP-WUS.

11. A communication method, characterized in that, The method includes: A third root is determined, wherein when the frequency offset of the LP-WUS corresponding to the third root is less than or equal to the second value, the equivalent time-domain offset of the LP-WUS is less than or equal to the second threshold. Send or receive a first LP-WUS, the first LP-WUS being determined based on a second ZC sequence, the second ZC sequence being determined based on the third root.

12. The method according to claim 11, characterized in that, The third root belongs to the set of the second roots, where, Any one of the roots in the second root set satisfies the following: when the frequency offset of the LP-WUS corresponding to the root is less than or equal to the second value, the equivalent time-domain offset of the LP-WUS is less than or equal to the second threshold.

13. The method according to claim 12, characterized in that, The second set of roots also includes a fourth root, which satisfies the following condition: when the frequency offset of the LP-SS corresponding to the second root is less than or equal to a first value, the equivalent time-domain offset of the LP-SS is greater than a first threshold.

14. The method according to claim 12 or 13, characterized in that, The second root set satisfies one or more of the following: When the length of the second ZC sequence is 23, the second root set includes at least one of 1, 6, 8, 11, 12, 15, 17, and 22; When the length of the second ZC sequence is 29, the second root set includes at least one of 1, 7, 10, 14, 15, 19, 22, and 28; When the length of the second ZC sequence is 31, the second root set includes at least one of 1, 8, 10, 15, 16, 21, 23, and 30; When the length of the second ZC sequence is 53, the second root set includes at least one of 1, 13, 18, 26, 27, 35, 40, and 52; When the length of the second ZC sequence is 59, the second root set includes at least one of 1, 15, 20, 29, 30, 39, 44, and 58; When the length of the second ZC sequence is 61, the second root set includes at least one of 1, 15, 20, 30, 31, 41, 46, and 60; or, When the length of the second ZC sequence is 127, the second root set includes at least one of 1, 32, 42, 63, 64, 85, 95, and 126.

15. The method according to any one of claims 11 to 14, characterized in that, The third root is determined based on the second signaling from the network device; The third root is determined from the second root set based on the identifier of the second cell, which is the cell transmitting the first LP-WUS; or, The third root is determined from the second root set according to the index of the second time unit, which is the time unit for transmitting the first LP-WUS.

16. The method according to any one of claims 11 to 15, characterized in that, The second threshold is greater than or equal to the time-domain sliding range of the second detection window, which is used to detect the first LP-WUS.

17. A communication method, characterized in that, The method includes: Transmit or receive a second LP-SS, the second LP-SS comprising M modulation symbols, of which N modulation symbols indicate a third value, wherein the N modulation symbols correspond to N ZC sequences, and at least two of the N ZC sequences have different roots, M is a positive integer, and N is a positive integer less than or equal to M.

18. The method according to claim 17, characterized in that, The modulation scheme corresponding to the M modulation symbols is OOK modulation scheme.

19. The method according to claim 17 or 18, characterized in that, The third value is 1.

20. The method according to any one of claims 17 to 19, characterized in that, The roots of any two ZC sequences among the N ZC sequences are different.

21. The method according to any one of claims 17 to 20, characterized in that, The root of any ZC sequence among the N ZC sequences satisfies the following: when the frequency offset of the LP-WUS corresponding to the root of any ZC sequence is less than or equal to a second value, the equivalent time-domain offset of the LP-WUS is less than or equal to a second threshold.

22. The method according to any one of claims 17 to 21, characterized in that, The roots of the N ZC sequences belong to a third root set, which satisfies one or more of the following: When the length of the ZC sequence is 23, the third root set includes at least one of 1, 6, 8, 11, 12, 15, 17, and 22; When the length of the ZC sequence is 29, the third root set includes at least one of 1, 7, 10, 14, 15, 19, 22, and 28; When the length of the ZC sequence is 31, the third root set includes at least one of 1, 8, 10, 15, 16, 21, 23, and 30; When the length of the ZC sequence is 53, the third root set includes at least one of 1, 13, 18, 26, 27, 35, 40, and 52; When the length of the ZC sequence is 59, the third root set includes at least one of 1, 15, 20, 29, 30, 39, 44, and 58; When the length of the ZC sequence is 61, the third root set includes at least one of 1, 15, 20, 30, 31, 41, 46, and 60; or, When the length of the ZC sequence is 127, the third root set includes at least one of 1, 32, 42, 63, 64, 85, 95, and 126.

23. A communication device, characterized in that, The communication device includes a processing unit and a transceiver unit, the processing unit being coupled to the transceiver unit to perform the method as described in any one of claims 1 to 6, or the method as described in any one of claims 7 to 10, or the method as described in any one of claims 11 to 16, or the method as described in any one of claims 17 to 22.

24. A communication device, characterized in that, The communication device includes a processor configured to cause the communication device to perform the method as claimed in any one of claims 1 to 6, or to perform the method as claimed in any one of claims 7 to 10, or to perform the method as claimed in any one of claims 11 to 16, or to perform the method as claimed in any one of claims 17 to 22.

25. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program that, when run on a computer, causes the computer to perform the method as described in any one of claims 1 to 6, or causes the computer to perform the method as described in any one of claims 7 to 10, or causes the computer to perform the method as described in any one of claims 11 to 16, or causes the computer to perform the method as described in any one of claims 17 to 22.

26. A computer program product, characterized in that, The computer program product includes a computer program that, when run on a computer, causes the computer to perform the method as described in any one of claims 1 to 6, or causes the computer to perform the method as described in any one of claims 7 to 10, or causes the computer to perform the method as described in any one of claims 11 to 16, or causes the computer to perform the method as described in any one of claims 17 to 22.

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