Cell search method, signal transmission method, communication node, medium, and program product

Abstract

The invention discloses a cell search method, a signal transmission method, a communication node, a medium and a program product. Comprising the following steps: determining a first frequency point set and a frequency point group associated with each first frequency point in the first frequency point set; selecting a first frequency point from the first frequency point set, and detecting a first signal on the selected first frequency point; and performing cell search according to a detection result. And based on the detection result of the first signal detection on each first frequency point in the determined first frequency point set, determining whether cell search needs to be carried out on the frequency point group associated with the first frequency point, so that the communication node does not need to carry out cell search on the frequency point group associated with all the frequency points. The searching time delay during full-band cell searching is reduced, and the requirement for rapid cell searching of a mobile communication system under the conditions that the communication frequency band is increased and the cell coverage range is expanded is met.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a cell search method, a signal transmission method, a communication node, a medium, and a program product. Background Art

[0002] In a mobile communication system, a user equipment (UE) needs to perform cell search when initially powered on or when the flight mode is turned off. Cell search is a process in which the UE obtains time and frequency synchronization with a cell and detects the physical layer cell identifier of the cell, that is, the UE can obtain the physical cell identifier, achieve downlink time-frequency synchronization, and access the cell through cell search. New Radio (NR) cell search is implemented based on the primary synchronization signal and the secondary synchronization signal, as well as the physical broadcast channel (PBCH) located on the synchronization grid and its corresponding demodulation reference signal (DMRS).

[0003] As the requirement for data rate in the mobile communication system is getting higher and higher, the communication frequency band is also continuously increasing. The future sixth-generation mobile communication (6G) system needs to support a wider frequency band range, and the number of synchronization grids may further increase. In addition, in order to expand the coverage range of the cell, the base station can use narrower beams to transmit the synchronization signal / physical broadcast channel block (SSB). The number of SSBs sent by the cell may increase, and it may take a longer period to transmit all SSB beams in different beam directions. If the number of receiving beams of the terminal is also large, the time for scanning the transceiver beams in the downlink will also be longer. All these may lead to an increase in cell search latency and make it difficult to meet the requirement of fast cell search in the mobile communication system. Summary of the Invention

[0004] This application provides a cell search method, a signal transmission method, a communication node, a medium, and a program product, which reduce the search latency during cell search over the entire frequency band and meet the requirement of fast cell search in the mobile communication system under the conditions of increased communication frequency band and expanded cell coverage range.

[0005] To achieve the above object, an embodiment of this application provides a cell search method, which is applied to a first communication node and includes:

[0006] Determine a first frequency point set and a frequency point group associated with each first frequency point in the first frequency point set;

[0007] Select a first frequency point from the first frequency point set and detect a first signal at the selected first frequency point;

[0008] Perform cell search according to the detection result.

[0009] To achieve the above object, an embodiment of the present application provides a signal sending method, which is applied to a second communication node and includes:

[0010] Determine at least one first frequency point and a frequency point group associated with each first frequency point;

[0011] Select at least one first frequency point from each first frequency point and send a first signal at the selected first frequency point;

[0012] According to the sending situation of the first signal at each first frequency point, send a cell search synchronization signal on the frequency point group associated with each first frequency point.

[0013] To achieve the above object, an embodiment of the present application provides a communication node, including: a memory, a processor, a program stored on the memory and executable on the processor, and a data bus for realizing the connection and communication between the processor and the memory. When the program is executed by the processor, it realizes the steps of the cell search method or the signal sending method according to any one of the embodiments of the present application.

[0014] To achieve the above object, an embodiment of the present application provides a storage medium for computer-readable storage. The storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to realize the steps of the cell search method or the signal sending method according to any one of the embodiments of the present application.

[0015] To achieve the above object, an embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, it realizes the steps of the cell search method or the signal sending method according to any one of the embodiments of the present application.

[0016] The cell search method, signal transmission method, communication node, medium, and program product provided by the embodiments of the present application determine a first frequency point set and the frequency point groups associated with each first frequency point in the first frequency point set; select a first frequency point from the first frequency point set and detect a first signal on the selected first frequency point; and perform cell search according to the detection result. By adopting the above technical solution, based on the detection result of detecting the first signal on each first frequency point in the determined first frequency point set, it is determined whether it is necessary to perform cell search on the frequency point groups associated with the first frequency point, so that the communication node does not need to perform cell search on the frequency point groups associated with all frequency points, reducing the search delay during full-band cell search and meeting the requirement of fast cell search in a mobile communication system when the communication frequency band increases and the cell coverage range expands. Description of the Drawings

[0017] Figure 1 It is a flowchart of a cell search method provided by an embodiment of the present application;

[0018] Figure 2 It is a flowchart of a signal transmission method provided by an embodiment of the present application;

[0019] Figure 3 It is a flow example diagram of a cell search method provided by an embodiment of the present application;

[0020] Figure 4 It is an example diagram of the first signal transmission situation on a first frequency point provided by an embodiment of the present application;

[0021] Figure 5 It is a distribution example diagram of the first frequency point and the frequency point groups associated with the first frequency point within the entire frequency range provided by an embodiment of the present application;

[0022] Figure 6 It is a schematic diagram of defining the first frequency point and the frequency point groups associated with the first frequency point within frequency band X provided by an embodiment of the present application;

[0023] Figure 7 It is a schematic structural diagram of a cell search device provided by an embodiment of the present application;

[0024] Figure 8 It is a schematic structural diagram of a signal transmission device provided by an embodiment of the present application;

[0025] Figure 9 It is a schematic structural diagram of a communication node provided by an embodiment of the present application. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of this application more clearly understood, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be arbitrarily combined with each other.

[0027] The steps shown in the flowchart of the accompanying drawings may be executed in a computer system such as a set of computer-executable instructions. And although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than here.

[0028] The cell search method provided by the embodiments of this application can be applied to a mobile communication system to improve the situation where the cell search delay increases due to the increase in communication frequency bands, the increase in the number of synchronization grids, the expansion of cell coverage, and the increase in the number of SSBs sent by the cell, reducing the search delay during cell search across all frequency bands and meeting the requirements for fast cell search in a mobile communication system when the communication frequency band increases and the cell coverage expands.

[0029] In a mobile communication system, a UE needs to perform cell search when initially powered on or when the flight mode is turned off. Cell search is a process by which a UE acquires time and frequency synchronization with a cell and detects the physical layer cell identifier of the cell, that is, through cell search, a UE can obtain the physical cell identifier, achieve downlink time-frequency synchronization, and access the cell. NR cell search is implemented based on the primary synchronization signal and the secondary synchronization signal, as well as the PBCH and its corresponding DMRS located on the synchronization grid.

[0030] As the mobile communication system has an increasingly high requirement for data rate, the communication frequency bands are continuously increasing. The 6G system needs to support a wider frequency band range, and the number of synchronization grids may further increase. In addition, to expand the cell coverage, the base station may use narrower beams to send SSBs, and the number of SSBs sent by the cell may increase. It may take a longer period to send all SSB beams in different beam directions once. If the number of receiving beams of the terminal is also large, the time to scan the transceiver beams of the downlink is also longer. All these may lead to an increase in cell search delay. Therefore, how to achieve fast cell search in the case of a large number of synchronization grids is an urgent problem to be solved.

[0031] Since the NR system defines a synchronization raster that is sparser than the channel raster to reduce the latency of the cell search process of the terminal, the synchronization raster is the frequency point for transmitting synchronization signals. The center frequency point of the SSB is located on the synchronization raster, and each synchronization raster corresponds to a Global Synchronization Channel Number (GSCN). When the terminal is just powered on for cell search, it usually detects the SSB signal on the synchronization raster according to the operator and the frequency bands supported by the terminal to perform downlink time-frequency synchronization. For different frequency ranges, the intervals of the synchronization raster are different. Taking frequencies below 100,000 MHz as an example, Table 1 gives the GSCN parameters for channel bandwidths above 3 MHz. In the range of 0 - 3000 MHz, the interval of the synchronization raster is 1200 kHz; in the range of 3000 - 24250 MHz, the interval of the synchronization raster is 1.44 MHz; in the range of 24250 - 100000 MHz, the interval of the synchronization raster is 17.28 MHz.

[0032] Table 1: GSCN Parameters for Channel Bandwidths above 3 MHz

[0033]

[0034] For different channel bandwidths, 3GPP has defined different synchronization rasters. Table 2 gives the GSCN parameters for a 3 MHz channel bandwidth. In the ranges of 0 - 1000 MHz and 1432 - 1435 MHz, the interval of the synchronization raster is 600 kHz.

[0035] Table 2: GSCN Parameters for a 3 MHz Channel Bandwidth

[0036]

[0037] Meanwhile, NR also defines the GSCN range for each operating band within the frequency ranges (FR) FR1 and FR2. Within an operating band (simply referred to as a band), the GSCN is the frequency point used for cell search in that band, i.e., the frequency point for transmitting the SSB for initial access. Taking the bands within FR1 as an example, Table 3 shows the GSCN ranges for some bands. Here, taking n1 as an example, the subcarrier spacing of the SSB on the n1 band is 15 kHz, and the corresponding time-domain pattern is Case A. n1 is a Frequency Division Duplexing (FDD) band, with the uplink frequency range from 1920 MHz to 1980 MHz and the downlink frequency range from 2110 MHz to 2170 MHz. The number (i.e., GSCN) of the first synchronization raster within the downlink frequency range of n1 is 5279. Since within the range of 0 to 3000 MHz, GSCN = 3N+(M - 3) / 2, the corresponding N = 1760 and M = 1 for this GSCN. According to the formula of the SSB frequency position SS REF it can be known that the frequency corresponding to GSCN 5279 is 2112.05 MHz, which is the frequency point for cell search. Similarly, it can be calculated that the frequency corresponding to the number 5280 of the second synchronization raster is 2112.15 MHz, that is, each synchronization raster or frequency point within the band corresponds to a synchronization raster number GSCN. According to the GSCN range of each band, the number of GSCNs for each band can be calculated. As can be seen from the above, GSCN is the number of the synchronization raster. In the embodiments of the present application, the synchronization raster and GSCN are equivalent. The frequency points for the terminal to perform cell search in the embodiments of the present application can be the synchronization raster or GSCN. Without causing ambiguity, the synchronization raster and GSCN in the embodiments of the present application can be replaced. The frequency ranges of FR1 and FR2 are shown in Table 4 below.

[0038] Table 3: Example Table of GSCNs for Each Band within FR1 with Channel Bandwidth above 3 MHz

[0039]

[0040] Table 4: Frequency Range Table of FR1 and FR2

[0041]

[0042] When the terminal powers on for the first time or fails to perform cell search on the saved historical frequency points, it will perform a full-band search according to the supported frequency range until it finds an effective network and selects a suitable cell to camp on. When the terminal performs a full-band search, it attempts to perform cell search for each synchronization grid within the supported frequency range. The more synchronization grids there are, the longer the search delay. To solve the above problems, the embodiments of the present application provide a cell search method. First, a first communication node determines a first frequency point set within the frequency band to be searched, and then detects a first signal for each first frequency point in the first frequency point set. Based on the detection results, it determines whether to perform cell search on the frequency point group associated with the first frequency point, so that the communication node does not need to perform cell search on the frequency point groups associated with all frequency points, reducing the search delay during full-band cell search and meeting the requirement of rapid cell search in the mobile communication system under the condition of increased communication frequency bands and expanded cell coverage. The cell search method provided by the embodiments of the present application can be implemented by a communication node, which can be a communication device applied to the next-generation 6G communication system and subsequent communication systems (6G and beyond), such as a UE, a base station, a relay station, or a satellite, or a communication device of the next-generation fixed access wireless communication system, such as an access point (AccessPoint, AC) or a terminal. The embodiments of the present application do not limit this. In some possible implementation manners, the cell search method can be implemented by calling computer-readable instructions stored in a memory. For ease of description, in the following description of the present application, the first communication node is represented as a UE, and the second communication node is represented as a base station.

[0043] In an exemplary embodiment, Figure 1 FIG. is a flowchart of a cell search method provided by an embodiment of the present application. This method can be applied to a mobile communication system. In the case of performing cell search within a frequency point group that needs to be searched based on the detection results of detecting a first signal on each first frequency point in the first frequency point set, this method can be executed by a cell search device. The cell search device can be implemented by software and / or hardware and integrated on the first communication node. The first communication node can be a UE in the mobile communication system. The embodiments of the present application do not limit this.

[0044] As Figure 1 shown, the cell search method provided by the embodiments of the present application specifically includes the following steps:

[0045] S101. Determine a first frequency point set and the frequency point group associated with each first frequency point in the first frequency point set.

[0046] In this embodiment, the first frequency point can be specifically understood as the frequency point selected by the first communication node from the frequency bands it supports for the first signal detection. The first frequency point set can be specifically understood as the set composed of all the first frequency points selected by the first communication node. The frequency point group associated with the first frequency point can be specifically understood as the frequency point group associated with the first frequency point, which may contain cell search synchronization signals (or synchronization signals and physical broadcast channels) for cell search.

[0047] In a specific example, at least one first frequency point can be defined based on the entire frequency range or a sub-frequency range within the entire frequency range or the frequency range of each frequency band, and the association relationship between each first frequency point and the frequency point group is defined. The first communication node determines the set composed of each first frequency point within the frequencies it supports as the first frequency point set, and determines the frequency point group available for cell search associated with each first frequency point according to the association relationship.

[0048] S102. Select a first frequency point from the first frequency point set, and detect the first signal on the selected first frequency point.

[0049] In this embodiment, the first signal can be specifically understood as the signal used to indicate whether cell search needs to be performed on the frequency point group associated with the first frequency point where the first signal is detected.

[0050] In a specific example, a corresponding selection method is adopted according to actual needs to select a first frequency point from the first frequency point set, determine the selected first frequency point, and then perform the first signal detection on the selected first frequency point to obtain the detection result of whether there is a first signal on the corresponding first frequency point.

[0051] S103. Perform cell search according to the detection result.

[0052] In a specific example, it is determined whether there is a first signal on the first frequency point according to the detection result, and then the cell search is performed on the frequency point group associated with the first frequency point having the first signal or the frequency point group associated with the first frequency point not containing the first signal according to actual needs.

[0053] The cell search method provided by the embodiments of the present application determines a first frequency point set and a frequency point group associated with each first frequency point in the first frequency point set; selects a first frequency point from the first frequency point set and detects a first signal on the selected first frequency point; and performs cell search according to the detection result. By adopting the above technical solution, based on the detection result of detecting the first signal on each first frequency point in the determined first frequency point set, it is determined whether it is necessary to perform cell search on the frequency point group associated with the first frequency point, so that the communication node does not need to perform cell search on the frequency point groups associated with all frequency points, reducing the search delay during full-band cell search and meeting the requirement of fast cell search in the mobile communication system under the conditions of increased communication frequency band and expanded cell coverage range.

[0054] In one embodiment, determining the first frequency point set and the frequency point group associated with each first frequency point in the first frequency point set includes at least one of the following:

[0055] Define the first frequency points in the entire frequency range and the frequency point groups associated with the first frequency points, use all the first frequency points included in the frequency band supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set;

[0056] Define the first frequency points in each frequency band and the frequency point groups associated with the first frequency points. When the frequency band supported by the first communication node includes one or more frequency bands, use all the first frequency points included in the frequency band supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set; when the frequency band supported by the first communication node is less than the frequency range of the frequency band, use all the first frequency points within the frequency band supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set;

[0057] Define the first frequency points in each frequency band and the frequency point groups associated with the first frequency points, use all the first frequency points included in one or more frequency bands supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set;

[0058] Define the first frequency points in the entire frequency range and the frequency point groups associated with the first frequency points, use all the first frequency points in the entire frequency range as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set;

[0059] Define the first frequency points in each sub-frequency range and the frequency point groups associated with the first frequency points, use all the first frequency points included in one or more sub-frequency ranges supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set.

[0060] In some examples, the definition of the first frequency point and the frequency point groups associated with the first frequency point can be carried out across the entire frequency range in a mobile communication system. The first communication node takes all the first frequency points within the frequency band supported by itself as the first frequency point set, and takes the frequency point groups associated with the first frequency points within the frequency band supported by the first communication node as the frequency point groups associated with each first frequency point in the first frequency point set. It should be noted that there are cases where the frequency point groups associated with the first frequency point span two or more frequency bands. If the synchronization raster (i.e., the frequency points for cell search) of the frequency band supported by the first communication node is not included in any of the frequency point groups associated with the first frequency points in the first frequency point set, the frequency point groups to which these synchronization rasters belong can be determined according to a predetermined rule. For example, the synchronization raster with a lower frequency can be included in the frequency point group associated with the first first frequency point in the first frequency point set, and the synchronization raster with a higher frequency can be included in the frequency point group associated with the last first frequency point in the first frequency point set.

[0061] In some examples, for each frequency band in a mobile communication system, the definition of the first frequency point within the frequency band and the frequency point groups associated with the first frequency point can be carried out. Then, when the frequency band range supported by the first communication node includes one or more frequency bands, all the first frequency points within the frequency bands supported by it can be taken as the first frequency point set, and the frequency point groups associated with the first frequency points corresponding to the frequency bands within the frequency band range supported by it can be taken as the frequency point groups associated with each first frequency point in the first frequency point set; while when the frequency band range supported by the first communication node is smaller than the frequency range of each frequency band, the first communication node takes all the first frequency points included within the frequency band range supported by it as the first frequency point set, and takes the frequency point groups associated with the first frequency points included within the frequency band range supported by the first communication node as the frequency point groups associated with each first frequency point in the first frequency point set. Similarly, when the frequency band range supported by the first communication node is smaller than the frequency range of each frequency band, if the synchronization raster (i.e., the frequency points for cell search) of the frequency band range supported by the first communication node is not included in any of the frequency point groups associated with the first frequency points in the first frequency point set, the frequency point groups to which these synchronization rasters belong can be determined according to a predetermined rule.

[0062] In some examples, for each frequency band in a mobile communication system, the definition of the first frequency point within the frequency band and the frequency point groups associated with the first frequency point can be carried out. The first communication node takes all the first frequency points included within one or more frequency bands it supports as the first frequency point set, and takes the frequency point groups associated with the first frequency points within the frequency bands within the frequency band range it supports as the frequency point groups associated with each first frequency point in the first frequency point set.

[0063] In some examples, the definition of the first frequency point and the frequency point group associated with the first frequency point can be carried out in the entire frequency range of the mobile communication system, and all the first frequency points in the entire frequency range are used as the first frequency point set, and the frequency point groups associated with the first frequency points in the entire frequency range are used as the frequency point groups associated with each first frequency point in the first frequency point set.

[0064] In one embodiment, selecting a first frequency point from the first frequency point set includes at least one of the following:

[0065] Randomly selecting a first frequency point from the first frequency point set;

[0066] Selecting a first frequency point from the first frequency point set in ascending order of frequency;

[0067] Selecting a first frequency point from the first frequency point set in descending order of frequency;

[0068] Selecting a first frequency point from the first frequency point set according to the frequency point priority;

[0069] Selecting a first frequency point from the first frequency point set according to the implementation manner of the first communication node.

[0070] In this embodiment, the implementation manner of the first communication node can be specifically understood as the implementation manner directly configured in the first communication node by the operator or the equipment manufacturer according to the actual situation, or the implementation manner configured in the first communication node by the first communication node through software update.

[0071] In one embodiment, performing cell search according to the detection result includes:

[0072] When the detection result is that the first signal is detected, or the intensity of the first signal is higher than the predefined threshold, performing cell search on the frequency point group associated with the selected first frequency point;

[0073] When the cell search on the frequency point group associated with the selected first frequency point fails, the detection result is that the first signal is not detected, or the intensity of the first signal is less than or equal to the predefined threshold, return to execute the step of selecting a first frequency point from the first frequency point set and detecting the first signal on the selected first frequency point;

[0074] Wherein, the first frequency point selected when returning to execute the step of selecting a first frequency point from the first frequency point set is the first frequency point in the first frequency point set on which the first signal has not been detected.

[0075] In a specific example, when the first communication node determines that the detection result is that the first signal is detected, or the detected strength of the first signal is higher than a predefined threshold, it can be considered that the first communication node can perform a cell search operation on the frequency band group associated with the selected first frequency band where the first signal is detected.

[0076] In a specific example, when the first communication node fails to perform a cell search on the frequency band group associated with the selected first frequency band, or the detection result is that the first signal is not detected, or the detected strength of the first signal is less than or equal to the predefined threshold, it can be considered that the first communication node needs to select a new first frequency from the first frequency set for the first signal detection, and determine whether to perform a cell search on the frequency band group associated with the selected new first frequency according to the detection result. At this time, return to execute the step of selecting a first frequency from the first frequency set and detecting the first signal on the selected first frequency, that is, return to execute S102. When returning to execute this step, the new first frequency selected from the first frequency set should be the first frequency in the first frequency set that has not been used for the first signal detection.

[0077] In one embodiment, performing a cell search according to the detection result includes:

[0078] When the detection result is that the first signal is not detected, perform a cell search on the frequency band group associated with the selected first frequency band;

[0079] When the cell search on the frequency band group associated with the selected first frequency band fails, or the detection result is that the first signal is detected, return to execute the step of selecting a first frequency from the first frequency set and detecting the first signal on the selected first frequency;

[0080] Among them, the first frequency selected when returning to execute the step of selecting a first frequency from the first frequency set is the first frequency in the first frequency set that has not been used for the first signal detection.

[0081] In a specific example, when the first communication node determines that the detection result is that the first signal is not detected, it can be considered that the first communication node can perform a cell search operation on the frequency band group associated with the selected first frequency band where the first signal is not detected.

[0082] In a specific example, when the first communication node fails to perform cell search on the frequency band group associated with the selected first frequency band, or determines that the detection result is that the first signal is detected, it can be considered that the first communication node needs to select a new first frequency band from the first frequency band set to detect the first signal, and determine whether to perform cell search on the frequency band group associated with the selected new first frequency band according to the detection result. At this time, return to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band, that is, return to execute S102. When returning to execute this step, the new first frequency band selected from the first frequency band set should be the first frequency band in the first frequency band set on which the first signal has not been detected.

[0083] In one embodiment, performing cell search according to the detection result includes:

[0084] When the detection result is that the first signal is not detected, perform cell search on the frequency band group associated with the selected first frequency band;

[0085] If the cell search on the frequency band group associated with the selected first frequency band fails, return to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band;

[0086] Among them, the first frequency band selected when returning to execute the step of selecting a first frequency band from the first frequency band set is the first frequency band in the first frequency band set on which the first signal has not been detected.

[0087] In a specific example, when the first communication node determines that the detection result is that the first signal is not detected, it can be considered that the first communication node can perform a cell search operation on the frequency band group associated with the selected first frequency band where the first signal is not detected. If the cell search on the frequency band group associated with the selected first frequency band fails, it can be considered that a new cell search is required. At this time, return to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band, that is, return to execute S102. When returning to execute this step, the new first frequency band selected from the first frequency band set should be the first frequency band in the first frequency band set on which the first signal has not been detected.

[0088] In one embodiment, after returning to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band, it further includes:

[0089] If the first signal is not detected on the first frequency band selected in the step of returning to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band, return to execute the step of performing cell search on the frequency band group associated with the selected first frequency band;

[0090] If a first signal is detected at the first frequency point selected in the step of returning to execute the selection of a first frequency point from the first frequency point set and detecting the first signal at the selected first frequency point, then return to execute the step of returning to execute the selection of a first frequency point from the first frequency point set and detecting the first signal at the selected first frequency point.

[0091] In a specific example, after returning to execute S102, if the first signal is not detected at the first frequency point newly selected from the first frequency point set, the same processing as the above "in the case where the detection result is that the first signal is not detected, perform cell search on the frequency point group associated with the selected first frequency point" can be performed, and the same subsequent operations can be performed.

[0092] In a specific example, after returning to execute S102, if the first signal is detected at the first frequency point newly selected from the first frequency point set, it can be considered that the first communication node does not need to perform cell search on the frequency point group associated with the newly selected first frequency point. At this time, the step of "returning to execute the selection of a first frequency point from the first frequency point set and detecting the first signal at the selected first frequency point" proposed above can be returned to execute, that is, return to execute S102 again, and sequentially execute the subsequent corresponding processing.

[0093] In one embodiment, performing cell search according to the detection result includes:

[0094] In the case where the detection result is that the first signal is detected, select a first frequency point that is at a preset interval from the selected first frequency point from the first frequency point set in a preset order as the newly selected first frequency point, and detect the first signal at the newly selected first frequency point;

[0095] In the case where the detection result at the newly selected first frequency point is that the first signal is not detected, determine a second frequency point set from the first frequency point set according to the newly selected first frequency point and the preset interval, select a first frequency point from the second frequency point set, detect the first signal at the first frequency point in the selected second frequency point set, and perform cell search according to the detection result of the first frequency point in the selected second frequency point set;

[0096] In the case where the detection result at the newly selected first frequency point is that the first signal is detected, use the newly selected first frequency point as the selected first frequency point, and return to execute the step of selecting a first frequency point that is at a preset interval from the selected first frequency point from the first frequency point set in a preset order as the newly selected first frequency point.

[0097] In a specific example, when the first communication node detects a first signal on a first frequency, it means that the second communication node will not send a downlink signal for cell search (such as a synchronization signal or SSB) on the frequencies in the frequency band group associated with the first communication node. The first communication node also does not need to perform cell search on the frequency band group associated with the first frequency, thereby reducing the cell search delay. However, in actual use, it is possible that the second communication node does not send a downlink signal for cell search on most frequencies, which means that the second communication node needs to send the first signal on most of the first frequencies, which is not conducive to the energy saving of the second communication node. In view of the above situation, the second communication node can, within a frequency range, in ascending order of frequency, when not sending a downlink signal for cell search on a low-frequency segment of frequencies, predefine to continuously select one or more first frequencies at intervals of L from the low frequency to send the first signal. This means that no downlink signal for cell search is sent on the frequency band groups associated with the first frequencies before the first selected first frequency (if there are first frequencies before the first selected first frequency) and all the first frequencies between these selected first frequencies. Once the second communication node no longer sends the first signal on the selected first frequency, it means that the second communication node needs to send a downlink signal for cell search on at least one frequency in the frequency band group associated with the first frequency or the L-1 first frequencies before the first frequency, or all the first frequencies after the first frequency. At this time, the second communication node also no longer sends the first signal on the subsequent first frequencies.

[0098] In view of the above situation, if the first communication node detects the first signal on one or more consecutive first frequencies at intervals of L starting from the low frequency or the high frequency, the first communication node does not need to perform cell search on the frequency band groups associated with the first frequencies before the first first frequency where the first signal is detected (if there are first frequencies before the first selected first frequency) and all the first frequencies between these first frequencies where the first signal is detected. When the first communication node does not detect the first signal for the first time on one or more consecutive first frequencies at intervals of L, the first communication node needs to perform cell search on the frequency band group associated with the first frequency where the first signal is not detected.

[0099] Accordingly, in the case where the first communication node determines that the detection result is the detection of the first signal, it can be considered that the first communication node does not need to perform cell search on the frequency point group associated with the first frequency point where the first signal is detected. On this basis, the first communication node will select a first frequency point from the first frequency point set at a preset interval from the first frequency point where the above-mentioned detected first signal is selected as the newly selected first frequency point. This preset interval can be understood as the above-mentioned L. Then, the first signal is detected for the newly selected first frequency point. In the case where the first signal is not detected on the newly selected first frequency point, it can be considered that there may be a downlink signal for cell search sent by the second communication node in all the frequency point groups associated with the first frequency points after the first frequency point where the above-mentioned detected first signal is selected. At this time, the second frequency point set that may be used for cell search can be determined from the first frequency point set according to the newly selected first frequency point and the preset interval, and the first frequency point is selected from the second frequency point set, and the first signal is detected on the first frequency point in the selected second frequency point set, and cell search is performed according to the detection result, that is, cell search is performed on the frequency point group associated with the first frequency point in the selected second frequency point set where the first signal is not detected. Among them, the method of detecting the first signal for the first frequency point selected from the second frequency point set and performing cell search according to the detection result can be the same as the method of detecting the first signal for the first frequency point selected from the first frequency point set and performing cell search according to the detection result above. That is, for the first frequency point in the selected second frequency point set where the first signal is detected, return to execute the step of selecting the first frequency point from the second frequency point set and detecting the first signal on the first frequency point in the selected second frequency point set. So that the first communication node does not need to detect the first signal for the first frequency points between the first frequency points that continuously detect the first signal selected at a preset interval, thereby enabling the cell search to be advanced quickly.

[0100] In one embodiment, determining the second frequency point set from the first frequency point set according to the newly selected first frequency point and the preset interval includes:

[0101] Determining all the first frequency points starting from the first number of first frequency points before the newly selected first frequency point in the first frequency point set as the second frequency point set;

[0102] Wherein, the first number is the preset interval minus one.

[0103] In some examples, it is assumed that there are 24 first frequency points within a frequency range, and the corresponding GSCNs are from m to m + 24 (i.e., the first frequency point set). The second communication node sends the first signal on the first 4 first frequency points with an interval L = 4 (i.e., GSCN m, GSCN m + 4, GSCN m + 8, GSCN m + 12), which means that no downlink signal for cell search is sent on the frequency point groups associated with the first 13 first frequency points. The second communication node does not send the first signal on the 17th first frequency point (i.e., GSCN m + 16), which means that the second communication node sends the downlink signal for cell search on at least one frequency point in all the frequency point groups associated with the 3 first frequency points before the 17th first frequency point and the 8 first frequency points after it. At this time, the 17th first frequency point can be understood as the newly selected first frequency point in the embodiment of the present application. The first communication node can determine, from the first frequency point set, the second frequency point set that needs to perform the first signal detection in sequence, which is the set composed of the 13th first frequency point to the 24th first frequency point, that is, the set composed of the 13th first frequency point to the 24th first frequency point is determined as the second frequency point set.

[0104] In one embodiment, selecting a first frequency point from the second frequency point set includes at least one of the following:

[0105] Randomly select a first frequency point from the second frequency point set;

[0106] Select a first frequency point from the second frequency point set in ascending order of frequency;

[0107] Select a first frequency point from the second frequency point set in descending order of frequency;

[0108] Select a first frequency point from the second frequency point set according to the frequency point priority;

[0109] Select a first frequency point from the second frequency point set according to the implementation manner of the first communication node.

[0110] It can be understood that the selection method of selecting a first frequency point from the second frequency point set here is the same as the selection method of selecting a first frequency point from the first frequency point set above, and the embodiments of the present application do not describe this in more detail.

[0111] In one embodiment, performing cell search according to the detection result of the first frequency point in the selected second frequency point set includes:

[0112] When the detection result of the first frequency point in the selected second frequency point set is that the first signal is not detected, perform cell search on the frequency point group associated with the first frequency point in the selected second frequency point set;

[0113] If cell search fails on the frequency band group associated with the first frequency in the selected second frequency band set, or if the detection result of the first frequency in the selected second frequency band set is that the first signal is detected, return to execute the step of selecting a first frequency from the second frequency band set.

[0114] In a specific example, for the re-determined second frequency band set, the first communication node will detect the first signal for each first frequency therein in the same manner as above, and perform cell search according to the detection result in the same manner. That is, if the detection result of the first frequency in the selected second frequency band set is that the first signal is not detected, it can be considered that the first communication node can perform cell search among the first frequencies in the selected second frequency band set. At this time, cell search can be performed on the frequency band group associated with the first frequency in the selected second frequency band set. If cell search fails on the frequency band group associated with the first frequency in the selected second frequency band set, or if the detection result of the first frequency in the selected second frequency band set is that the first signal is detected, then a first frequency is re-selected from the second frequency band set in the same manner as above, and this step is repeated until cell search is completed.

[0115] In one embodiment, the preset order includes at least one of the following:

[0116] From low to high frequency;

[0117] From high to low frequency.

[0118] In one embodiment, performing cell search on the frequency band group associated with the first frequency includes at least one of the following:

[0119] Randomly select frequencies from the frequency band group associated with the first frequency, and perform cell search on the selected frequencies until cell search is successful or all frequencies in the frequency band group are traversed;

[0120] Select frequencies from the frequency band group associated with the first frequency in order from high to low frequency, and perform cell search on the selected frequencies until cell search is successful or all frequencies in the frequency band group are traversed;

[0121] Select frequencies from the frequency band group associated with the first frequency in order from low to high frequency, and perform cell search on the selected frequencies until cell search is successful or all frequencies in the frequency band group are traversed;

[0122] Select frequencies from the frequency band group associated with the first frequency in order of frequency priority, and perform cell search on the selected frequencies until cell search is successful or all frequencies in the frequency band group are traversed;

[0123] Select a frequency point from the frequency point group associated with the first frequency point according to the implementation manner of the first communication node, and perform cell search on the selected frequency point until the cell search is successful or all frequency points in the frequency point group are traversed.

[0124] In one embodiment, performing cell search on the frequency point group associated with the first frequency point further includes:

[0125] Perform cell search on one or more frequency points selected from the frequency point group associated with the first frequency point based on the frequency point information indicated by the detected first signal.

[0126] In a specific example, only for the case where cell search is performed on the frequency point group associated with the first frequency point when the detection result is that the first signal is detected, the first communication node can select one or more from the frequency point group associated with the first frequency point based on the frequency point information indicated by the first signal detected therein, so as to perform cell search on the frequency point group associated with the first frequency point where the first signal is detected.

[0127] In one embodiment, the frequency point information indicated by the first signal includes:

[0128] The transmission situation of SSB on each frequency point in the frequency point group associated with the first frequency point, or the frequency points for cell search in the frequency point group associated with the first frequency point.

[0129] In one embodiment, the first signal includes at least one of the following:

[0130] Dedicated sequence;

[0131] Primary synchronization sequence;

[0132] Secondary synchronization sequence;

[0133] Signal of on-off keying (OOK) waveform;

[0134] Signal of frequency-shift keying (FSK) waveform.

[0135] In one embodiment, the first signal is a fixed signal;

[0136] Wherein, the first communication node determines whether to perform cell search on the frequency point group associated with the first frequency point according to whether the first signal is detected on the first frequency point.

[0137] In one embodiment, when there is a synchronization grid in the frequency band range supported by the first communication node that is not included in any frequency point group associated with the first frequency point in the first frequency point set, include the non-included synchronization grid in the frequency point group associated with a specific first frequency point in the first frequency point set. For example, the specific first frequency point can be determined according to a predetermined rule.

[0138] In one embodiment, the synchronization grid within the frequency band supported by the first communication node is related to the bandwidth capability of the first communication node or the type of service supported by the first communication node.

[0139] In an exemplary embodiment, Figure 2 FIG. is a flowchart of a signal sending method provided by an embodiment of the present application. This method can be applied to a mobile communication system, and is a situation where a first signal and a cell search synchronization signal are combined and sent on a first frequency point and a frequency point group associated with the first frequency point according to requirements to reduce the cell search amount of a terminal. This method can be executed by a signal sending device, which can be implemented by software and / or hardware and integrated on a second communication node. The second communication node can be a base station in a mobile communication system, and the embodiment of the present application does not limit this.

[0140] As Figure 2 shown, the signal sending method provided by the embodiment of the present application specifically includes the following steps:

[0141] S201. Determine at least one first frequency point and a frequency point group associated with each first frequency point.

[0142] In this embodiment, the first frequency point can be specifically understood as a frequency point selected by the second communication node within the large frequency band it supports and can be used for sending the first signal.

[0143] In a specific example, the second communication node selects at least one first frequency point that can be used for sending the first signal within the frequency band it can support, and determines, in the same manner as above, a frequency point group associated with each first frequency point, which can be used for sending a cell search synchronization signal and thus for the first communication node to perform cell search.

[0144] S202. Select at least one first frequency point from the first frequency points and send the first signal on the selected first frequency point.

[0145] In a specific example, the second communication node selects at least one first frequency point from the multiple first frequency points it supports based on actual requirements and sends the first signal on the selected first frequency point.

[0146] In some examples, the actual requirement may be a requirement for the first communication node to perform cell search on the frequency point group associated with the first frequency point, or may be a requirement for the first communication node not to perform cell search on the frequency point group associated with the first frequency point.

[0147] S203. Send a cell search synchronization signal on the frequency point group associated with each first frequency point according to the sending situation of the first signal on each first frequency point.

[0148] In this embodiment, the transmission situation of the first signal on the first frequency point can be specifically understood as the situation of whether to transmit the first signal on the first frequency point.

[0149] In a specific example, according to the transmission situations of the first signal on each first frequency point, it can be determined whether the first signal is transmitted on each first frequency point. When it is required that the first communication node performs cell search on the first frequency point where the first signal is transmitted, at least one frequency point is selected from the frequency point group associated with the first frequency point where the first signal is transmitted to transmit a cell search synchronization signal that can be used by the first communication node for cell search. When it is not required that the first communication node performs cell search on the first frequency point where the first signal is transmitted, at least one frequency point is selected from the frequency point group associated with the first frequency point where the first signal is not transmitted to transmit a cell search synchronization signal that can be used by the first communication node for cell search.

[0150] In one embodiment, according to the transmission situations of the first signal on each first frequency point, transmitting a cell search synchronization signal on the frequency point group associated with each first frequency point includes at least one of the following:

[0151] Transmitting a cell search synchronization signal on the frequency point group associated with the first frequency point where the first signal is transmitted;

[0152] Transmitting a cell search synchronization signal on the frequency point group associated with the first frequency point where the first signal is not transmitted.

[0153] In one embodiment, the first signal includes at least one of the following:

[0154] Dedicated sequence;

[0155] Primary synchronization sequence;

[0156] Secondary synchronization sequence;

[0157] Signal of on-off keying waveform;

[0158] Signal of frequency shift keying waveform.

[0159] In one embodiment, the first signal is a fixed signal;

[0160] Wherein, the first communication node determines whether to perform cell search based on the cell search synchronization signal on the frequency point group associated with the first frequency point according to whether the first signal is detected on the first frequency point.

[0161] The following exemplarily illustrates the cell search method of the present application through some exemplary solutions. In the following solutions, the terminal is used to represent the first communication node in the above embodiments, and the base station is used to represent the second communication node in the above embodiments for description.

[0162] Solution 1: A solution is provided in which the terminal performs cell search on the frequency point group associated with the first frequency point of the first signal when it is detected. Figure 3 It is a flowchart example of a cell search method provided by an embodiment of the present application. As Figure 3 shown, it specifically includes the following steps:

[0163] S301. The terminal determines the first frequency point set and the frequency point group associated with the first frequency point in the first frequency point set.

[0164] S302. The terminal selects a first frequency point from the first frequency point set and detects the first signal on the selected first frequency point.

[0165] S303. The terminal performs a cell search operation according to the detection result.

[0166] In some examples, S303 can be implemented in the following manner:

[0167] S3031. When the terminal detects the first signal on the selected first frequency point, or when the intensity of the detected first signal is higher than the predefined threshold, the terminal performs cell search on the frequency point group associated with the selected first frequency point.

[0168] S3032. When the terminal fails to perform cell search on the frequency point group, or does not detect the first signal on the selected first frequency point, or the intensity of the detected first signal on the selected first frequency point is lower than the predefined threshold, the terminal selects the next first frequency point from the first frequency point set to detect the first signal and returns to execute S3031.

[0169] It can be understood that the next first frequency point selected by the terminal from the first frequency point set should be the first frequency point in the first frequency point set that has not been used for the first signal detection.

[0170] In one embodiment, if the terminal successfully performs cell search on any frequency point group, the terminal ends the cell search or initiates the subsequent initial access process.

[0171] In some examples, the terminal selects a first frequency point from the first frequency point set, including at least one of the following:

[0172] Randomly select a first frequency point from the first frequency point set;

[0173] Select a first frequency point from the first frequency point set in ascending order of frequency;

[0174] Select a first frequency point from the first frequency point set in descending order of frequency;

[0175] Select a first frequency point from the first frequency point set according to the frequency point priority;

[0176] Select a first frequency point from a first set of frequency points according to the implementation of the first communication node.

[0177] In one embodiment, the terminal performs cell search on a frequency point group associated with the selected first frequency point, including at least one of the following:

[0178] The terminal randomly selects a frequency point from the frequency point group and performs cell search on the selected frequency point until the cell search is successful or all frequency points in the frequency point group are traversed;

[0179] The terminal sequentially selects frequency points from the frequency point group in ascending order of frequency and performs cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed;

[0180] The terminal sequentially selects frequency points from the frequency point group in descending order of frequency and performs cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed;

[0181] The terminal sequentially selects frequency points from the frequency point group in the order of frequency point priority and performs cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed;

[0182] The terminal performs cell search on one or more frequency points in the frequency point group associated with the first frequency point based on the frequency point information indicated by the detected first signal;

[0183] The terminal selects a frequency point from the frequency point group according to the implementation and performs cell search on the selected frequency point.

[0184] In one embodiment, the manner in which the terminal determines the first set of frequency points and the frequency point group associated with the first frequency point in the first set of frequency points includes at least one of the following:

[0185] Define the first frequency point and the frequency point group associated with the first frequency point within the entire frequency range. The terminal uses all the first frequency points within its supported frequency band range as the first set of frequency points, and uses the frequency point groups associated with the first frequency points within its supported frequency band range as the frequency point groups associated with the corresponding first frequency points in the first set of frequency points;

[0186] Define the first frequency point in each frequency band and the frequency point group associated with the first frequency point. When the frequency band range supported by the terminal includes one or more frequency bands, the terminal takes all the first frequency points of the frequency bands within its supported frequency band range as the first frequency point set, and takes the frequency point groups associated with the first frequency points corresponding to the frequency bands within its supported frequency band range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set; when the frequency band range supported by the terminal is less than the frequency range of the frequency band, the terminal takes all the first frequency points included within its supported frequency band range as the first frequency point set, and takes the frequency point groups associated with the first frequency points included within its supported frequency band range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0187] Define the first frequency point in each frequency band and the frequency point group associated with the first frequency point. The terminal takes all the first frequency points within one or more frequency bands supported by itself as the first frequency point set, and takes the frequency point groups associated with the first frequency points within one or more frequency bands supported by itself as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0188] Define the first frequency point in the entire frequency range and the frequency point group associated with the first frequency point. The terminal takes all the first frequency points in the entire frequency range as the first frequency point set, and takes the frequency point groups associated with the first frequency points in the entire frequency range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0189] Define the first frequency point in each sub - frequency range and the frequency point group associated with the first frequency point. The terminal takes all the first frequency points within one or more sub - frequency ranges supported by itself as the first frequency point set, and takes the frequency point groups associated with the first frequency points within one or more sub - frequency ranges supported by itself as the frequency point groups associated with the corresponding first frequency points in the first frequency point set.

[0190] In one embodiment, if there are synchronization grids in the frequency point groups within the frequency band range supported by the terminal that do not contain any first frequency points in the first frequency point set, assume that these synchronization grids are included in the frequency point groups associated with specific first frequency points in the first frequency point set. For example, assume that there are a total of 100 synchronization grids within the frequency band range supported by the terminal, and the first 5 and the last 3 synchronization grids are not included in the frequency point groups associated with any first frequency points in the first frequency point set. Then it can be assumed that the first 5 synchronization grids are included in the frequency point group associated with the first first frequency point in the first frequency point set, and the last 3 synchronization grids are included in the frequency point group associated with the last first frequency point in the first frequency point set. Or both the first 5 and the last 3 synchronization grids are included in the frequency point group associated with the first first frequency point in the first frequency point set.

[0191] In one embodiment, the synchronization raster within the frequency band range supported by the terminal is related to the bandwidth capability of the terminal or the service type supported by the terminal. For example, assume that terminal 1 supports frequency band n5 and its bandwidth capability is greater than 3 MHz, or terminal 1 supports frequency band n5 and supports broadband services. Then, the range of the synchronization raster number GSCN of terminal 1 within frequency band n5 is from 2177 to 2230. Assume that terminal 2 supports frequency band n5 and its bandwidth capability is equal to 3 MHz, or terminal 2 supports frequency band n5 and supports narrowband services. Then, the range of the synchronization raster number GSCN of terminal 2 within frequency band n5 is from 30987 to 31100.

[0192] In one embodiment, the first signal transmitted on the first frequency point in the first frequency point set indicates which frequency points in the frequency point group associated with the first frequency point have transmitted SSBs, or indicates the frequency points on which the terminal performs cell search in the frequency point group associated with the first frequency point.

[0193] In one embodiment, the first signal includes at least one of the following:

[0194] Dedicated sequence;

[0195] Primary synchronization sequence;

[0196] Secondary synchronization sequence;

[0197] Signal of on-off keying (OOK) waveform;

[0198] Signal of frequency-shift keying (FSK) waveform.

[0199] In some examples, the dedicated sequence refers to a defined sequence for transmission on the first frequency point in the first frequency point set. The giant dedicated sequence can be an m-sequence, a gold sequence, a pseudo-random sequence, or any other sequence, and the embodiments of the present application do not limit this.

[0200] In one embodiment, the first signal is a fixed signal, and the terminal determines whether to perform cell search on the frequency point group associated with the first frequency point based on whether the first signal is detected on the first frequency point. For example, the first signal can be a defined dedicated sequence, or a primary synchronization sequence, or a secondary synchronization sequence, or a signal of OOK waveform, or a signal of FSK waveform.

[0201] In one embodiment, the first signal may indicate frequency point information. After the terminal detects the first signal on the first frequency point, it determines on which one or more frequency points in the frequency point group associated with the first frequency point to perform cell search according to the frequency point information indicated by the first signal. For example, multiple dedicated sequences or primary synchronization sequences or secondary synchronization sequences or signals with OOK waveforms or signals with FSK waveforms may be defined, and each of them indicates one or more frequency points in the frequency point group. For example, the number of dedicated sequences may be less than the number of frequency points included in the frequency point group. Two dedicated sequences are defined to indicate the even frequency points and odd frequency points in the frequency point group respectively. That is, if the first signal detected by the terminal on a frequency point is the first dedicated sequence, the terminal performs cell search on the even frequency points in the frequency point group associated with the frequency point. If the first signal detected by the terminal on a frequency point is the second dedicated sequence, the terminal performs cell search on the odd frequency points in the frequency point group associated with the frequency point.

[0202] Solution 2: A solution is provided for the terminal to perform cell search on the frequency point group associated with the first frequency point where the first signal is not detected. Its overall process is the same as the process example of the cell search method shown above Figure 3 in Figure 1 which, the difference lies in the implementation manner of S303. In this solution, the specific implementation manner of S303 is expanded, and specifically includes the following steps:

[0203] S3031. When the terminal does not detect the first signal on the selected first frequency point, the terminal performs cell search on the frequency point group associated with the selected first frequency point.

[0204] S3032. When the terminal fails to perform cell search on the frequency point group or detects the first signal on the selected first frequency point, the terminal selects the next first frequency point from the first frequency point set to detect the first signal and returns to execute S3031.

[0205] It can be understood that the next first frequency point selected by the terminal from the first frequency point set should be the first frequency point in the first frequency point set on which the first signal has not been detected.

[0206] In one embodiment, if the terminal successfully performs cell search on any frequency point group, the terminal ends the cell search or initiates the subsequent initial access process.

[0207] In some examples, the terminal selects a first frequency point from the first frequency point set, including at least one of the following:

[0208] Randomly select a first frequency point from the first frequency point set;

[0209] Select a first frequency point from the first frequency point set in ascending order of frequency;

[0210] Select a first frequency point from the first frequency point set in descending order of frequency;

[0211] Select a first frequency point from the first frequency point set according to the frequency point priority;

[0212] Select a first frequency point from the first frequency point set according to the implementation mode of the first communication node.

[0213] In one embodiment, the terminal performs cell search on the frequency point group associated with the selected first frequency point, including at least one of the following:

[0214] The terminal randomly selects a frequency point from the frequency point group and performs cell search on the selected frequency point until the cell search is successful or all the frequency points in the frequency point group are traversed;

[0215] The terminal sequentially selects frequency points from the frequency point group in ascending order of frequency and performs cell search on the selected frequency points until the cell search is successful or all the frequency points in the frequency point group are traversed;

[0216] The terminal sequentially selects frequency points from the frequency point group in descending order of frequency and performs cell search on the selected frequency points until the cell search is successful or all the frequency points in the frequency point group are traversed;

[0217] The terminal sequentially selects frequency points from the frequency point group in the order of frequency point priority and performs cell search on the selected frequency points until the cell search is successful or all the frequency points in the frequency point group are traversed;

[0218] The terminal selects a frequency point from the frequency point group based on the implementation mode and performs cell search on the selected frequency point.

[0219] In one embodiment, the way for the terminal to determine the first frequency point set and the frequency point group associated with the first frequency point in the first frequency point set includes at least one of the following:

[0220] Define the first frequency point and the frequency point group associated with the first frequency point within the entire frequency range. The terminal uses all the first frequency points within its supported frequency band range as the first frequency point set, and uses the frequency point groups associated with the first frequency points within its supported frequency band range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0221] Define the first frequency point in each frequency band and the frequency point group associated with the first frequency point. When the frequency band range supported by the terminal includes one or more frequency bands, the terminal takes all the first frequency points of the frequency bands within the frequency band range it supports as the first frequency point set, and takes the frequency point groups associated with the first frequency points corresponding to the frequency bands within the frequency band range it supports as the frequency point groups associated with the corresponding first frequency points in the first frequency point set; when the frequency band range supported by the terminal is less than the frequency range of the frequency band, the terminal takes all the first frequency points included in the frequency band range it supports as the first frequency point set, and takes the frequency point groups associated with the first frequency points included in the frequency band range it supports as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0222] Define the first frequency point in each frequency band and the frequency point group associated with the first frequency point. The terminal takes all the first frequency points within one or more frequency bands it supports as the first frequency point set, and takes the frequency point groups associated with the first frequency points within one or more frequency bands it supports as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0223] Define the first frequency point in the entire frequency range and the frequency point group associated with the first frequency point. The terminal takes all the first frequency points in the entire frequency range as the first frequency point set, and takes the frequency point groups associated with the first frequency points in the entire frequency range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0224] Define the first frequency point in each sub - frequency range and the frequency point group associated with the first frequency point. The terminal takes all the first frequency points within one or more sub - frequency ranges it supports as the first frequency point set, and takes the frequency point groups associated with the first frequency points within one or more sub - frequency ranges it supports as the frequency point groups associated with the corresponding first frequency points in the first frequency point set.

[0225] In an embodiment, if there are synchronization grids in the frequency point groups within the frequency band range supported by the terminal that do not contain any first frequency points in the first frequency point set, assume that these synchronization grids are included in the frequency point groups associated with specific first frequency points in the first frequency point set. For example, assume that there are a total of 100 synchronization grids within the frequency band range supported by the terminal, and the first 5 and the last 3 synchronization grids do not contain any first frequency points in the frequency point groups of the first frequency point set. Then it can be assumed that the first 5 synchronization grids are included in the frequency point group associated with the first first frequency point in the first frequency point set, and the last 3 synchronization grids are included in the frequency point group associated with the last first frequency point in the first frequency point set. Or the first 5 and the last 3 synchronization grids are both included in the frequency point group associated with the first first frequency point in the first frequency point set.

[0226] In one embodiment, the synchronization raster within the frequency band supported by the terminal is related to the bandwidth capability of the terminal or the type of service supported by the terminal. For example, assume that terminal 1 supports frequency band n5 and its bandwidth capability is greater than 3 MHz, or terminal 1 supports frequency band n5 and supports broadband services. Then, the range of the synchronization raster number GSCN of terminal 1 within frequency band n5 is from 2177 to 2230. Assume that terminal 2 supports frequency band n5 and its bandwidth capability is equal to 3 MHz, or terminal 2 supports frequency band n5 and supports narrowband services. Then, the range of the synchronization raster number GSCN of terminal 2 within frequency band n5 is from 30987 to 31100.

[0227] In one embodiment, the first signal includes at least one of the following:

[0228] Dedicated sequence;

[0229] Primary synchronization sequence;

[0230] Secondary synchronization sequence;

[0231] Signal of on-off keying (OOK) waveform;

[0232] Signal of frequency-shift keying (FSK) waveform.

[0233] In some examples, the dedicated sequence refers to a defined sequence for transmission on the first frequency point in the first set of frequency points. The giant dedicated sequence can be an m-sequence, a gold sequence, a pseudo-random sequence, or any other sequence, which is not limited in the embodiments of this application.

[0234] In one embodiment, the first signal is a fixed signal, and the terminal determines whether to perform cell search on the frequency point group associated with the first frequency point based on whether the first signal is detected on the first frequency point. For example, a dedicated sequence, a primary synchronization sequence, a secondary synchronization sequence, a signal of OOK waveform, or a signal of FSK waveform can be defined. Multiple dedicated sequences, primary synchronization sequences, secondary synchronization sequences, signals of OOK waveform, or signals of FSK waveform can also be defined. If the first signal detected by the terminal on a first frequency point is any one of the dedicated sequence, the primary synchronization sequence, the secondary synchronization sequence, the signal of OOK waveform, or the signal of FSK waveform, then the terminal does not perform cell search on the frequency point group associated with that frequency point.

[0235] Solution 3: Another solution for the terminal to perform cell search on the frequency point group associated with the first frequency point where the first signal is not detected is given. Its overall process is the same as the Figure 3 flow example of the cell search method shown above Figure 1Regarding the difference lies in the implementation manner of S303, the specific implementation manner of S303 in this solution is elaborated. First, the reasons for proposing this solution are explained as follows:

[0236] When the terminal detects a first signal on a first frequency point, it means that the base station will not send downlink signals (i.e., synchronization signals or SSBs) for cell search on the frequency points in the frequency point group associated with the first frequency point. The terminal does not need to perform cell search on this frequency point group either, thus reducing the cell search delay of the terminal. However, in practice, it is possible that the base station does not send downlink signals for cell search on most frequency points. This means that the base station needs to send the first signal on most first frequency points, which is not conducive to the energy saving of the base station. A solution to achieve base station energy saving is: within a frequency range, the base station arranges the frequencies in ascending order. When the base station does not send downlink signals for cell search on a section of low-frequency frequencies, one or more first frequency points can be continuously selected at intervals of L from the low frequency to send the first signal. This means that no downlink signals for cell search are sent on the frequency point groups associated with the first frequency points before the first selected first frequency point (if there are first frequency points) and all the first frequency points between these selected first frequency points. Once the base station no longer sends the first signal on the selected first frequency point, it means that when the base station needs to send downlink signals for cell search on at least one frequency point in the frequency point groups associated with the first frequency point or the L-1 first frequency points before the first frequency point or all the frequency points after the first frequency point, the base station will no longer send the first signal on the subsequent first frequency points. For the terminal, if the terminal detects the first signal on one or more consecutive first frequency points at intervals of L starting from the low frequency or high frequency, the terminal does not need to perform cell search on the frequency point groups associated with the first frequency points before the first first frequency point where the first signal is detected (if there are first frequency points) and all the first frequency points between these first frequency points where the first signal is detected. When the terminal does not detect the first signal for the first time on one or more consecutive first frequency points at intervals of L, the terminal performs cell search on the frequency point group associated with the first frequency point where the first signal is not detected. If the cell search fails, the terminal then performs cell search on the frequency point groups associated with the first frequency point after the first frequency point where the first signal is not detected for the first time and the previous L-1 first frequency points. To illustrate the above situation of sending the first signal in detail, Figure 4 FIG. is a schematic diagram of an example of the situation of sending the first signal on the first frequency point provided by an embodiment of the present application, as Figure 4As shown, there are 24 first frequency points within a frequency range, and the corresponding GSCNs are from m to m + 24 (i.e., the first frequency point set). The base station sends the first signal on the first 4 first frequency points with an interval L = 4 (i.e., GSCN m, GSCN m + 4, GSCN m + 8, GSCN m + 12), which means that no downlink signal for cell search is sent on the frequency point groups associated with the first 13 first frequency points. The base station does not send the first signal on the 17th first frequency point (i.e., GSCN m + 16), which means that the base station sends the downlink signal for cell search on at least one frequency point in all the frequency point groups associated with 3 first frequency points before the 17th first frequency point and 8 first frequency points after it. After the terminal fails to detect the first signal for the first time on the 17th first frequency point, it needs to perform cell search on the frequency point group associated with GSCN m + 16. If the cell search fails, the terminal needs to perform cell search on the frequency point group associated with at least one of the 3 first frequency points before GSCN m + 16 and the 8 first frequency points after it.

[0237] In this solution, for the terminal to perform cell search operations according to the detection results, it specifically includes the following steps:

[0238] S3031: When the terminal fails to detect the first signal on the selected first frequency point, execute S3032; when the terminal detects the first signal on the selected first frequency point, execute S3034.

[0239] S3032: The terminal performs cell search on the frequency point group associated with the selected first frequency point. When the terminal fails to perform cell search on the frequency point group, execute S3033.

[0240] S3033: The terminal selects the next first frequency point from the first frequency points in the first frequency point set that have not been selected. When the terminal fails to detect the first signal on the selected next first frequency point, return to execute S3032; when the terminal detects the first signal on the selected next first frequency point, repeat to execute this step S3033.

[0241] S3034: The terminal selects the first frequency point with an interval of L frequency points from the first frequency point set in ascending order of frequency from the first frequency point selected last time. When the terminal detects the first signal on the newly selected first frequency point, repeat to execute this step S3034; when the terminal fails to detect the first signal on the newly selected first frequency point, execute S3035.

[0242] S3035. The terminal uses all the first frequency points starting from the (L - 1)-th first frequency point before the last selected first frequency point in the first frequency point set as the second frequency point set. The terminal selects a first frequency point from the second frequency point set, detects the first signal on the selected first frequency point, and the terminal performs cell search operations according to the detection result.

[0243] S3036. When the terminal does not detect the first signal on the selected first frequency point, the terminal performs cell search on the frequency point group associated with the selected first frequency point.

[0244] S3037. When the terminal fails to perform cell search on the frequency point group or detects the first signal on the selected first frequency point, the terminal selects the next first frequency point from the second frequency point set to detect the first signal, and returns to execute S3036.

[0245] It can be understood that when the terminal selects the first frequency points with an interval of L frequency points in S3034 above, the order from low to high in frequency can be replaced with the order from high to low, and the embodiments of the present application do not limit this.

[0246] In one embodiment, if the terminal successfully performs cell search on any frequency point group, the terminal ends cell search or starts subsequent initial access procedures.

[0247] In some examples, the terminal selects a first frequency point from the first frequency point set, including at least one of the following:

[0248] Randomly select a first frequency point from the first frequency point set;

[0249] Select a first frequency point from the first frequency point set in the order of increasing frequency;

[0250] Select a first frequency point from the first frequency point set in the order of decreasing frequency;

[0251] Select a first frequency point from the first frequency point set according to the frequency point priority;

[0252] Select a first frequency point from the first frequency point set according to the implementation manner of the first communication node.

[0253] In one embodiment, the terminal performs cell search on the frequency point group associated with the selected first frequency point, including at least one of the following:

[0254] The terminal randomly selects frequency points from the frequency point group and performs cell search on the selected frequency points until cell search is successful or all frequency points in the frequency point group are traversed;

[0255] The terminal sequentially selects frequency points from the frequency point group in ascending order of frequency and performs cell search on the selected frequency points until the cell search is successful or all the frequency points in the frequency point group are traversed;

[0256] The terminal sequentially selects frequency points from the frequency point group in descending order of frequency and performs cell search on the selected frequency points until the cell search is successful or all the frequency points in the frequency point group are traversed;

[0257] The terminal sequentially selects frequency points from the frequency point group in the order of frequency point priority and performs cell search on the selected frequency points until the cell search is successful or all the frequency points in the frequency point group are traversed;

[0258] The terminal selects frequency points from the frequency point group based on the implementation method and performs cell search on the selected frequency points.

[0259] In one embodiment, the method for the terminal to determine the first frequency point set and the frequency point group associated with the first frequency point in the first frequency point set includes at least one of the following:

[0260] Define the first frequency points and the frequency point groups associated with the first frequency points within the entire frequency range. The terminal uses all the first frequency points within its supported frequency band range as the first frequency point set, and uses the frequency point groups associated with the first frequency points within its supported frequency band range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0261] Define the first frequency points and the frequency point groups associated with the first frequency points within each frequency band. When the supported frequency band range of the terminal includes one or more frequency bands, the terminal uses all the first frequency points of the frequency bands within its supported frequency band range as the first frequency point set, and uses the frequency point groups associated with the corresponding first frequency points of the frequency bands within its supported frequency band range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set; when the supported frequency band range of the terminal is less than the frequency range of the frequency band, the terminal uses all the first frequency points within its supported frequency band range as the first frequency point set, and uses the frequency point groups associated with the first frequency points within its supported frequency band range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0262] Define the first frequency points and the frequency point groups associated with the first frequency points within each frequency band. The terminal uses all the first frequency points within one or more frequency bands it supports as the first frequency point set, and uses the frequency point groups associated with the first frequency points within one or more frequency bands it supports as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0263] Define a first frequency point and a frequency point group associated with the first frequency point within the entire frequency range. The terminal uses all the first frequency points within the entire frequency range as the first frequency point set, and uses the frequency point groups associated with the first frequency points within the entire frequency range as the frequency point groups associated with the corresponding first frequency points in the first frequency point set;

[0264] Define a first frequency point and a frequency point group associated with the first frequency point within each sub - frequency range. The terminal uses all the first frequency points within one or more sub - frequency ranges it supports as the first frequency point set, and uses the frequency point groups associated with the first frequency points within one or more sub - frequency ranges it supports as the frequency point groups associated with the corresponding first frequency points in the first frequency point set.

[0265] In one embodiment, if there are synchronization grids within the frequency band range supported by the terminal that are not included in any of the frequency point groups associated with the first frequency points in the first frequency point set, assume that these synchronization grids are included in the frequency point groups associated with specific first frequency points in the first frequency point set. For example, assume that there are a total of 100 synchronization grids within the frequency band range supported by the terminal, and the first 5 and the last 3 synchronization grids are not included in any of the frequency point groups associated with the first frequency points in the first frequency point set. Then it can be assumed that the first 5 synchronization grids are included in the first frequency point group associated with the first first frequency point in the first frequency point set, and the last 3 synchronization grids are included in the last frequency point group associated with the first frequency points in the first frequency point set. Or both the first 5 and the last 3 synchronization grids are included in the first frequency point group associated with the first first frequency point in the first frequency point set.

[0266] In one embodiment, the synchronization grids within the frequency band range supported by the terminal are related to the bandwidth capability of the terminal or the service types supported by the terminal. For example, assume that terminal 1 supports frequency band n5 and its bandwidth capability is greater than 3 MHz, or terminal 1 supports frequency band n5 and supports broadband services. Then the range of the synchronization grid number GSCN of terminal 1 within frequency band n5 is from 2177 to 2230. Assume that terminal 2 supports frequency band n5 and its bandwidth capability is equal to 3 MHz, or terminal 2 supports frequency band n5 and supports narrow - band services. Then the range of the synchronization grid number GSCN of terminal 2 within frequency band n5 is from 30987 to 31100.

[0267] In one embodiment, the first signal includes at least one of the following:

[0268] Dedicated sequence;

[0269] Primary synchronization sequence;

[0270] Secondary synchronization sequence;

[0271] A signal of On - Off Keying (OOK) waveform;

[0272] A signal with a Frequency-Shift Keying (FSK) waveform.

[0273] In some examples, a dedicated sequence refers to a defined sequence for transmission on a first frequency point in a first set of frequency points. The Giant dedicated sequence can be an m-sequence, a gold sequence, a pseudo-random sequence, or any other sequence, and the embodiments of the present application do not limit this.

[0274] In one embodiment, the first signal is a fixed signal, and the terminal determines whether to perform cell search on the frequency point group associated with the first frequency point based on whether the first signal is detected on the first frequency point. For example, the first signal can be a defined dedicated sequence, or a primary synchronization sequence, or a secondary synchronization sequence, or a signal with an OOK waveform, or a signal with an FSK waveform. Multiple dedicated sequences, or primary synchronization sequences, or secondary synchronization sequences, or signals with an OOK waveform, or signals with an FSK waveform can also be defined. If the first signal detected by the terminal on a first frequency point is any one of the dedicated sequences, or primary synchronization sequences, or secondary synchronization sequences, or signals with an OOK waveform, or signals with an FSK waveform, then the terminal does not perform cell search on the frequency point group associated with that frequency point.

[0275] Solution 4: Presents a cell search scheme based on priority.

[0276] In one embodiment, although a larger interval of the synchronization grid can reduce the delay of cell search, it obviously reduces the flexibility of network deployment. A solution is to define two or more priorities for the synchronization grid. From the perspective of the terminal, within the frequency band supported by the terminal, the terminal first performs cell search on the synchronization grid with the highest priority. If the cell search fails on the synchronization grid with the highest priority, the terminal can further perform cell search on the synchronization grid with the second priority, and so on. From the perspective of the base station, it first considers sending the downlink signal for cell search on the synchronization grid with the highest priority, and then considers sending the downlink signal for cell search on the synchronization grid with the second priority, and so on. In this case, deployment flexibility can be ensured, and at the same time, the delay of cell search can be reduced through deployment.

[0277] In one embodiment, the synchronization grid is divided into P priorities, where P is greater than or equal to 2, and each priority corresponds to at least one synchronization grid; the terminal performs cell search according to the priority of the synchronization grid.

[0278] In one embodiment, the manner in which the terminal performs cell search includes:

[0279] The terminal performs cell search on the synchronization grid with the first priority;

[0280] If the cell search fails on the synchronization raster of the first priority, the terminal performs cell search on the synchronization raster of the second priority.

[0281] If the cell search fails on the synchronization raster of the second priority, the terminal performs cell search on the synchronization raster of the third priority.

[0282] And so on. If the cell search fails on the synchronization raster of the (P - 1)th priority, the terminal performs cell search on the synchronization raster of the Pth priority.

[0283] In some examples, when P = 2, the terminal performs cell search on the synchronization raster of the first priority;

[0284] If the cell search fails on the synchronization raster of the first priority, the terminal performs cell search on the synchronization raster of the second priority.

[0285] In some examples, when P = 3, the terminal performs cell search on the synchronization raster of the first priority;

[0286] If the cell search fails on the synchronization raster of the first priority, the terminal performs cell search on the synchronization raster of the second priority.

[0287] If the cell search fails on the synchronization raster of the second priority, the terminal performs cell search on the synchronization raster of the third priority.

[0288] In one embodiment, if the cell search fails on the synchronization raster of the first priority, the terminal performs cell search on the synchronization raster of the second priority.

[0289] If the cell search fails on the synchronization raster of the second priority, the terminal performs cell search on the synchronization raster of the third priority.

[0290] It can be understood that the "priority" in the above solution can be replaced by "group", that is, "P priorities" means "P groups", that is, the synchronization raster of each priority is regarded as a group of synchronization rasters. The terminal performs cell search according to the synchronization raster group, and the effect of the terminal performing cell search according to the priority of the synchronization raster can be achieved.

[0291] In one embodiment, dividing priorities for the synchronization raster or grouping the synchronization raster can be achieved in the following way: The GSCN range of a frequency band n1 is from GSCN0 to GSCN 102 , assuming that the synchronization raster is divided into 2 priorities or 2 groups, then the even - numbered GSCNs are divided into the highest priority or the first priority (or group 0) in ascending order of GSCN, that is, GSCN0, GSCN2,..., GSCN 102, the odd - numbered GSCNs are divided into the second - highest priority or the second priority (or group 1), i.e., GSCN1, GSCN3, ..., GSCN 101 .

[0292] Solution 5: A solution is provided for a terminal to determine a first set of frequency points and a frequency - point group associated with a first frequency point in the first set of frequency points.

[0293] In this solution, a method for defining the first frequency point and the frequency - point group associated with the first frequency point in the entire frequency range, each sub - frequency range, or each frequency band is described, as well as a method for a terminal to determine the first set of frequency points and the frequency - point group associated with the first frequency point in the first set of frequency points.

[0294] In an embodiment, if the frequency points in the frequency - point group associated with the first frequency point in the first set of frequency points are not frequency points available for cell search within the frequency band supported by the terminal, then exclude the frequency points that are not available for cell search within the frequency band supported by the terminal from the frequency - point group, or the terminal does not perform cell search on the frequency points that are not available for cell search within the frequency band supported by the terminal.

[0295] In an embodiment, the first frequency point and the frequency - point group associated with the first frequency point in the entire frequency range are defined according to a predefined rule.

[0296] In some examples, the first frequency point and the frequency - point group associated with the first frequency point in the entire frequency range can be determined based on the total number N of synchronization grids (i.e., GSCN) included in the entire frequency range total and the number S of synchronization grids included in each frequency - point group. For example, the first frequency point can be included in its associated frequency - point group, and the predefined rule can be that the synchronization grid S*n + GSCN0 is the first frequency point in the entire frequency range, where n = 0, 1, ..., cei l(N total / S)-1, cei l represents the ceiling operation, and GSCN0 is the number of the first synchronization grid in the entire frequency range. The frequency points in the frequency - point group associated with the first frequency point S*n + GSCN0 except for the last first frequency point are: S*n + GSCN0 + s, where s = 0, 1, ..., S - 1. The frequency points in the frequency - point group associated with the last first frequency point S*(ceil(N total / S)-1)+GSCN0 are: If N total - S*floor(N total / S) is not equal to 0, floor represents the floor operation, then Otherwise, For another example, the first frequency point may not be included in its associated frequency point group. The predefined rule may be that the synchronization raster (S + 1)*n + GSCN0 is the first frequency point within the entire frequency range, where n = 0, 1, ..., cei l(N total / (S + 1)) - 1. For the first frequency points except the last one, the frequency points in the frequency point group associated with (S + 1)*n + GSCN0 are: (S + 1)*n + GSCN0 + s + 1, where s = 0, 1, ..., S - 1. For the last first frequency point (S + 1)*(ceil(N total / (S + 1)) - 1) + GSCN0, the frequency points in the associated frequency point group are: If N total -(S + 1)*floor(N total / (S + 1)) is not equal to 0 and not equal to 1, then If N total -(S + 1)*floor(N total / (S + 1)) = 0, If N total -(S + 1)*floor(N total / (S + 1)) = 1, the last first frequency point is not associated with any frequency point group, or its associated frequency point group is determined according to the predefined rule.

[0297] Figure 5 This is an example diagram of the distribution of the first frequency point and the frequency point group associated with the first frequency point within the entire frequency range provided by the embodiments of the present application. As Figure 5 shown, assuming there are 25 GSCNs in the entire frequency range (for clearer drawing, a smaller number of GSCNs is assumed in the figure, and the actual number of GSCNs may be larger), corresponding to GSCN m to GSCN m + 24, that is, N total = 25, and each frequency point group contains 5 GSCNs, that is, S = 5. Starting from GSCN m, every 5 GSCNs correspond to a first frequency point, that is, GSCN m + 5k is the first frequency point, k = 0, 1, 2, 3, 4, and the frequency point group associated with each first frequency point is 5 frequency points starting from this first frequency point, for a total of 5 frequency point groups.

[0298] It can be understood that in Figure 5 N total / S is exactly an integer, but in reality, it may not be an integer. For example, N total = 27, corresponding to GSCN m to GSCN m + 26, S = 5. In this case, the first 5 frequency point groups can be made to correspond to Figure 5The same, the last frequency point group contains GSCNs of GSCN m + 25 and GSCN m + 26, and the first GSCN in each frequency point group is the first frequency point.

[0299] In some examples, the terminal determines the first frequency point set and the frequency point group associated with the first frequency point in the first frequency point set according to the first frequency point in the entire frequency range and the frequency point group associated with the first frequency point. For example, taking Figure 5 the first frequency point in the entire frequency range and the frequency point group associated with the first frequency point as an example, assume that the frequency band range supported by the terminal includes the first frequency point group and the second frequency point group in the figure, that is, it includes frequency points GSCN m + 5 to GSCN m + 14, and the range of GSCNs available for cell search in this frequency band range is GSCN m + 5 to GSCN m + 14. Then the first frequency point set contains the first and second first frequency points, that is, {GSCN m + 5, GSCm + 10}. The frequency point group associated with GSCN m + 5 is GSCN m + 5 to GSCN m + 9, and the frequency point group associated with GSCN m + 10 is GSCN m + 10 to GSCN m + 14. Another example, assume that the frequency band range supported by the terminal includes the first frequency point group and the second frequency point group in the figure, that is, it includes frequency points GSCN m + 5 to GSCN m + 14, and the range of GSCNs available for cell search in this frequency band range is GSCN m + 5, GSCN m + 7, GSCN m + 9, GSCN m + 11, GSCN m + 13 (the GSCN step is 2). Then the first frequency point set is {GSCN m + 5, GSCm + 10}, that is, the first frequency point in the first frequency point set can be the GSCN available for cell search. The frequency point group associated with GSCN m + 5 is GSCN m + 5, GSCN m + 7, and GSCN m + 9, and the frequency point group associated with GSCN m + 10 is GSCN m + 10, GSCN m + 11, and GSCN m + 13. Or the frequency point group associated with GSCN m + 5 is GSCN m + 5 to GSCN m + 9, and the frequency point group associated with GSCN m + 10 is GSCN m + 10 to GSCN m + 14, but the terminal does not perform cell search on the GSCNs in the frequency point group that are not available for cell search.

[0300] In some examples, the first frequency point in the entire frequency range and the frequency point group associated with the first frequency point can be determined according to the total number of synchronization grids N total contained in the entire frequency range and the number M of frequency point groups. For example, the predefined rule can be that for the first N total - M * floor(N total / M) frequency point groups (if N total - M * floor(N total / M) is not 0, that is, if M cannot divide Ntotal ) Starting from the starting frequency within the entire frequency range, every floor(N total / M)+1 synchronization grids form a frequency point group. For the subsequent M-N total +M*floor(N total / M) frequency point groups (note that if M can divide N total then there are only the subsequent M frequency point groups), after removing the first N total -M*floor(N total / M) frequency point groups from the entire frequency range, every floor(N total / M)+1 synchronization grids form a frequency point group. The specific frequency point in a frequency point group is the first frequency point associated with that frequency point group. For example, the specific frequency point can be the first frequency point in the frequency point group, or the last frequency point, or a predefined frequency point.

[0301] In one embodiment, the first frequency point within each sub-frequency range and the frequency point group associated with the first frequency point can be defined according to a predefined rule.

[0302] In some examples, the first frequency point within the sub-frequency range and the frequency point group associated with the first frequency point can be determined based on the total number of synchronization grids included in the sub-frequency range and the number of synchronization grids included in each frequency point group. For specific details, reference can be made to the example of determining the first frequency point within the entire frequency range and the frequency point group associated with the first frequency point based on the total number of synchronization grids included in the entire frequency range and the number of synchronization grids included in each frequency point group above. Just replace the entire frequency range with the sub-frequency range, and it will not be elaborated here. For example, the sub-frequency range includes at least one of the following: FR1, FR2, the frequency range corresponding to the GSCN with a channel bandwidth above 3 MHz, the frequency range corresponding to the GSCN with a channel bandwidth of 3 MHz, FR2-1, FR2-2.

[0303] In some examples, the first frequency point within the sub-frequency range and the frequency point group associated with the first frequency point can be determined based on the total number of synchronization grids included in the sub-frequency range and the number of frequency point groups. For specific details, reference can be made to the example of determining the first frequency point within the entire frequency range and the frequency point group associated with the first frequency point based on the total number of synchronization grids included in the entire frequency range and the number of frequency point groups above. Just replace the entire frequency range with the sub-frequency range, and it will not be elaborated here.

[0304] In one embodiment, defining the first frequency points and the frequency point groups associated with the first frequency points within the entire frequency range according to predefined rules may involve determining the first frequency points and the frequency point groups associated with the first frequency points for each sub - frequency range within the entire frequency range, and then using the first frequency points and the frequency point groups associated with the first frequency points in all sub - frequency ranges as the first frequency points and the frequency point groups associated with the first frequency points within the entire frequency range. For example, if the entire frequency range includes two sub - frequency ranges FR1 and FR2, the first frequency points of FR1 are f11, f12,..., f1x (a total of x first frequency points), and the frequency point groups associated with them are g11, g12,..., g1x. The first frequency points of FR2 are f21, f22,..., f2y (a total of y first frequency points), and the frequency point groups associated with them are g21, g22,..., g2y. Then the first frequency points within the entire frequency range are f11, f12,..., f1x, f21, f22,..., f2y, and the frequency point groups associated with them are g11, g12,..., g1x, g21, g22,..., g2y.

[0305] In one embodiment, the first frequency points and the frequency point groups associated with the first frequency points within each frequency band can be determined according to predefined rules.

[0306] In some examples, the first frequency points and the frequency point groups associated with the first frequency points within a sub - frequency band can be determined based on the total number of synchronization grids included in the frequency band and the number of synchronization grids included in each frequency point group. For specific details, reference can be made to the example above of determining the first frequency points and the frequency point groups associated with the first frequency points within the entire frequency range based on the total number of synchronization grids included in the entire frequency range and the number of synchronization grids included in each frequency point group. Just replace the entire frequency range with the frequency band, and details will not be elaborated here.

[0307] In some examples, taking frequency band n1 as an example, the GSCN range of n is from 5279 to 5419. The GSCN of n1 is grouped. Assuming the group size is S, then the GSCN corresponding to frequency point group n is:

[0308] S * n + k + 5279, where k = 0, 1,..., S - 1, and S * n + k + 5279 ≤ 5419

[0309] For example, if S = 5, then the GSCN corresponding to each group is

[0310] Group 0 = {5279, 5280, 5281, 5282, 5283}

[0311] Group 1 = {5284, 5285, 5286, 5287, 5288} ......

[0313] By analogy, group 27 = {5414, 5415, 5416, 5417, 5418}, group 28 = {5419}. Since the frequency band contains 141 GSCNs and 141 is not a multiple of the group size S = 5, the number of GSCNs in the last group is less than 5.

[0314] where the total number N of GSCNs contained in the frequency band total may not be a multiple of the group size S. To make the number of GSCNs in the group uniform, the following grouping method can be adopted: when the total number of GSCNs in the frequency band is divisible by the group size, starting from the first GSCN in the frequency band, every S GSCNs form a group in sequence. When the total number of GSCNs in the frequency band is not divisible by the group size, starting from the first GSCN in the frequency band, group them in sequence. The total number of frequency points in the first mod(N total , S) frequency point groups is S + 1, and the total number of frequency points in the remaining frequency point groups is S. For example, assume the total number of GSCNs in the frequency band is N total , and the frequency point group size is S. Then if mod(N total , S) = 0, the GSCN corresponding to frequency point group n is: S * n + k + GSCN0, where k = 0, 1,..., S - 1. Here, mod(a, b) represents the remainder of a divided by b, and GSCN0 is the value of the first GSCN in the frequency band. If mod(N total , S) is not equal to 0, then for frequency point groups n = 0, 1,..., mod(N total , S) - 1, the GSCN is: (S + 1) * n + k + GSCN0, where k = 0, 1,..., S; for frequency point groups n = mod(N total , S), mod(N total , S) + 1,..., floor(N total / S) - 1, the GSCN is: S * (n - mod(N total , S)) + k + GSCN0 + (S + 1) * mod(N total , S), where k = 0, 1,..., S - 1.

[0315] If the step size (i.e., Step size) S of the GSCN corresponding to the frequency band step is not equal to 1, then the above formula also needs to include the GSCN step size. For example, if mod(N total , S) = 0, the GSCN corresponding to frequency point group n is: S step * (S * n + k) + GSCN0, where k = 0, 1,..., S - 1.

[0316] In some examples, the first frequency point within a frequency band and the frequency point group associated with the first frequency point can be determined based on the total number of synchronization grids included in the frequency band and the number of frequency point groups. For specific details, reference can be made to the example of determining the first frequency point within the entire frequency range and the frequency point group associated with the first frequency point based on the total number of synchronization grids included in the entire frequency range and the number of frequency point groups. Just replace the entire frequency range with the frequency band, and details will not be elaborated here.

[0317] In some examples, the synchronization grids within a frequency band can be grouped by interleaving. Each interleaving corresponds to a frequency point group, and a specific frequency point in each frequency point group serves as the first frequency point. Exemplarily, Figure 6 FIG. is a schematic diagram for defining the first frequency point within frequency band X and the frequency point group associated with the first frequency point provided by an embodiment of the present application. As Figure 6 shown, the synchronization grids within the frequency band are divided into 5 interleaveings. The GSCN corresponding to interleave k is GSCN m + 5n + k, where n = 0, 1, 2, 3, 4. Each interleaveing is a frequency point group, and the first GSCN in each frequency point group is the first frequency point associated with the frequency point group.

[0318] In some examples, the terminal determines the first frequency point set and the frequency point group associated with the first frequency point in the first frequency point set based on the first frequency point within each defined frequency band and the frequency point group associated with the first frequency point, and the frequency bands supported by the terminal itself. For example, the terminal takes all the first frequency points within one or more frequency bands supported by the terminal as the first frequency point set, and takes the frequency point groups associated with the first frequency points within one or more frequency bands supported by the terminal as the frequency point groups associated with the corresponding first frequency points in the first frequency point set. Taking the terminal supporting 2 frequency bands as an example, the first frequency points of frequency band X are bX1, bX2,..., bXz, that is, a total of z first frequency points, and the frequency point groups associated with them are gX1, gX2,..., gXz. The first frequency points of FR2 are bY1, bY2,..., bYw, that is, a total of w first frequency points, and the frequency point groups associated with them are gY1, gY2,..., gYw. Then the first frequency points of the entire frequency range are bX1, bX2,..., bXz, bY1, bY2,..., bYw, and the frequency point groups associated with them are gX1, gX2,..., gXz, gY1, gY2,..., gYw.

[0319] It should be clear that, without conflict, the above-mentioned various solutions, embodiments or examples and the features therein can be combined arbitrarily, and details will not be elaborated in the present application.

[0320] In an exemplary embodiment, Figure 7 FIG. is a schematic structural diagram of a cell search device provided by an embodiment of the present application. The cell search device is applied to a first communication node. As Figure 7 shown, the device includes:

[0321] The frequency point determination module 410 is configured to determine a first set of frequency points and a frequency point group associated with each first frequency point in the first set of frequency points.

[0322] The first signal detection module 420 is configured to select a first frequency point from the first set of frequency points and detect a first signal at the selected first frequency point.

[0323] The cell search module 430 is configured to perform cell search according to the detection result.

[0324] In one embodiment, determining the first set of frequency points and the frequency point group associated with each first frequency point in the first set of frequency points includes at least one of the following:

[0325] Defining the first frequency points in the entire frequency range and the frequency point groups associated with the first frequency points, taking all the first frequency points included in the frequency band range supported by the first communication node as the first set of frequency points, and determining the frequency point groups associated with the respective first frequency points in the first set of frequency points;

[0326] Defining the first frequency points in each frequency band and the frequency point groups associated with the first frequency points. When the frequency band range supported by the first communication node includes one or more frequency bands, taking all the first frequency points included in the frequency band range supported by the first communication node as the first set of frequency points, and determining the frequency point groups associated with the respective first frequency points in the first set of frequency points; when the frequency band range supported by the first communication node is less than the frequency range of the frequency band, taking all the first frequency points within the frequency band range supported by the first communication node as the first set of frequency points, and determining the frequency point groups associated with the respective first frequency points in the first set of frequency points;

[0327] Defining the first frequency points in each frequency band and the frequency point groups associated with the first frequency points, taking all the first frequency points included in one or more frequency bands supported by the first communication node as the first set of frequency points, and determining the frequency point groups associated with the respective first frequency points in the first set of frequency points;

[0328] Defining the first frequency points in the entire frequency range and the frequency point groups associated with the first frequency points, taking all the first frequency points in the entire frequency range as the first set of frequency points, and determining the frequency point groups associated with the respective first frequency points in the first set of frequency points;

[0329] Defining the first frequency points in each sub - frequency range and the frequency point groups associated with the first frequency points, taking all the first frequency points included in one or more sub - frequency ranges supported by the first communication node as the first set of frequency points, and determining the frequency point groups associated with the respective first frequency points in the first set of frequency points.

[0330] In one embodiment, selecting a first frequency point from the first set of frequency points includes at least one of the following:

[0331] Randomly select a first frequency point from the first frequency point set;

[0332] Select a first frequency point from the first frequency point set in ascending order of frequency;

[0333] Select a first frequency point from the first frequency point set in descending order of frequency;

[0334] Select a first frequency point from the first frequency point set according to the frequency point priority;

[0335] Select a first frequency point from the first frequency point set according to the implementation manner of the first communication node.

[0336] In one embodiment, cell search is performed according to the detection result, including:

[0337] When the detection result is that the first signal is detected, or the intensity of the first signal is higher than the predefined threshold, perform cell search on the frequency point group associated with the selected first frequency point;

[0338] When cell search fails on the frequency point group associated with the selected first frequency point, the detection result is that the first signal is not detected, or the intensity of the first signal is less than or equal to the predefined threshold, return to execute the step of selecting a first frequency point from the first frequency point set and detecting the first signal on the selected first frequency point;

[0339] Wherein, the selected first frequency point when returning to execute the step of selecting a first frequency point from the first frequency point set is the first frequency point in the first frequency point set that has not been subjected to the first signal detection.

[0340] In one embodiment, cell search is performed according to the detection result, including:

[0341] When the detection result is that the first signal is not detected, perform cell search on the frequency point group associated with the selected first frequency point;

[0342] When cell search fails on the frequency point group associated with the selected first frequency point, or the detection result is that the first signal is detected, return to execute the step of selecting a first frequency point from the first frequency point set and detecting the first signal on the selected first frequency point;

[0343] Wherein, the selected first frequency point when returning to execute the step of selecting a first frequency point from the first frequency point set is the first frequency point in the first frequency point set that has not been subjected to the first signal detection.

[0344] In one embodiment, cell search is performed according to the detection result, including:

[0345] In the case where the first signal is not detected in the detection result, cell search is performed on the frequency point group associated with the selected first frequency point;

[0346] If the cell search fails on the frequency point group associated with the selected first frequency point, return to execute the step of selecting a first frequency point from the first frequency point set and detecting the first signal on the selected first frequency point;

[0347] Among them, the selected first frequency point in the step of returning to execute selecting a first frequency point from the first frequency point set is the first frequency point in the first frequency point set on which the first signal has not been detected.

[0348] In one embodiment, after returning to execute the step of selecting a first frequency point from the first frequency point set and detecting the first signal on the selected first frequency point, it further includes:

[0349] If the first signal is not detected on the first frequency point selected in the step of returning to execute selecting a first frequency point from the first frequency point set and detecting the first signal on the selected first frequency point, return to execute the step of performing cell search on the frequency point group associated with the selected first frequency point;

[0350] If the first signal is detected on the first frequency point selected in the step of returning to execute selecting a first frequency point from the first frequency point set and detecting the first signal on the selected first frequency point, return to execute the step of returning to execute selecting a first frequency point from the first frequency point set and detecting the first signal on the selected first frequency point.

[0351] In one embodiment, performing cell search according to the detection result includes:

[0352] In the case where the first signal is detected in the detection result, select a first frequency point that is spaced apart from the selected first frequency point by a preset interval from the first frequency point set in a preset order as the newly selected first frequency point, and detect the first signal on the newly selected first frequency point;

[0353] In the case where the detection result of the newly selected first frequency point is that the first signal is not detected, determine a second frequency point set from the first frequency point set according to the newly selected first frequency point and the preset interval, select a first frequency point from the second frequency point set, detect the first signal on the first frequency point in the selected second frequency point set, and perform cell search according to the detection result of the first frequency point in the selected second frequency point set;

[0354] In the case where the detection result of the newly selected first frequency point is that the first signal is detected, use the newly selected first frequency point as the selected first frequency point, and return to execute the step of selecting a first frequency point that is spaced apart from the selected first frequency point by a preset interval from the first frequency point set in a preset order as the newly selected first frequency point.

[0355] In one embodiment, determining a second frequency point set from a first frequency point set according to a newly selected first frequency point and a preset interval includes:

[0356] Determining all first frequency points starting from the first quantity of first frequency points before the newly selected first frequency point in the first frequency point set as the second frequency point set;

[0357] Wherein, the first quantity is the preset interval minus one.

[0358] In one embodiment, selecting a first frequency point from the second frequency point set includes at least one of the following:

[0359] Randomly selecting a first frequency point from the second frequency point set;

[0360] Selecting a first frequency point from the second frequency point set in ascending order of frequency;

[0361] Selecting a first frequency point from the second frequency point set in descending order of frequency;

[0362] Selecting a first frequency point from the second frequency point set according to the frequency point priority;

[0363] Selecting a first frequency point from the second frequency point set according to the implementation manner of the first communication node.

[0364] In one embodiment, performing cell search according to the detection result of the first frequency point in the selected second frequency point set includes:

[0365] In the case where the detection result of the first frequency point in the selected second frequency point set is that the first signal is not detected, performing cell search on the frequency point group associated with the first frequency point in the selected second frequency point set;

[0366] In the case where the cell search on the frequency point group associated with the first frequency point in the selected second frequency point set fails, or the detection result of the first frequency point in the selected second frequency point set is that the first signal is detected, returning to execute the step of selecting a first frequency point from the second frequency point set.

[0367] In one embodiment, the preset order includes at least one of the following:

[0368] Ascending frequency;

[0369] Descending frequency.

[0370] In one embodiment, performing cell search on the frequency point group associated with the first frequency point includes at least one of the following:

[0371] Randomly select a frequency point from the frequency point group associated with the first frequency point, and perform cell search on the selected frequency point until the cell search is successful or all frequency points in the frequency point group are traversed;

[0372] Select frequency points in sequence from the frequency point group associated with the first frequency point in the order of frequency from high to low, and perform cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed;

[0373] Select frequency points in sequence from the frequency point group associated with the first frequency point in the order of frequency from low to high, and perform cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed;

[0374] Select frequency points in sequence from the frequency point group associated with the first frequency point according to the frequency point priority, and perform cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed;

[0375] Select a frequency point from the frequency point group associated with the first frequency point according to the implementation manner of the first communication node, and perform cell search on the selected frequency point until the cell search is successful or all frequency points in the frequency point group are traversed.

[0376] In one embodiment, performing cell search on the frequency point group associated with the first frequency point further includes:

[0377] Select one or more frequency points from the frequency point group associated with the first frequency point based on the frequency point information indicated by the detected first signal for cell search.

[0378] In one embodiment, the frequency point information indicated by the first signal includes:

[0379] The transmission situation of SSB on each frequency point in the frequency point group associated with the first frequency point, or the frequency points for cell search in the frequency point group associated with the first frequency point.

[0380] In one embodiment, the first signal includes at least one of the following:

[0381] Dedicated sequence;

[0382] Primary synchronization sequence;

[0383] Secondary synchronization sequence;

[0384] Signal of on-off keying (OOK) waveform;

[0385] Signal of frequency-shift keying (FSK) waveform.

[0386] In one embodiment, the first signal is a fixed signal;

[0387] Among them, the first communication node determines whether to perform cell search on a frequency point group associated with the first frequency point according to whether the first signal is detected on the first frequency point.

[0388] In one embodiment, when there is a synchronization raster within the frequency band range supported by the first communication node that is not included in any frequency point group associated with the first frequency point in the first frequency point set, the non-included synchronization raster is included in the frequency point group associated with a specific first frequency point in the first frequency point set.

[0389] In one embodiment, the synchronization raster within the frequency band range supported by the first communication node is related to the bandwidth capability of the first communication node or the service type supported by the first communication node.

[0390] In an exemplary embodiment, Figure 8 is a schematic structural diagram of a signal sending device provided by an embodiment of the present application, as Figure 8 shown, the device includes:

[0391] A frequency point determination module 510, configured to determine at least one first frequency point and a frequency point group associated with each first frequency point.

[0392] A first signal sending module 520, configured to select at least one first frequency point from each first frequency point and send a first signal on the selected first frequency point.

[0393] A synchronization signal sending module 530, configured to send a cell search synchronization signal on the frequency point group associated with each first frequency point according to the sending situation of the first signal on each first frequency point.

[0394] In one embodiment, sending a cell search synchronization signal on the frequency point group associated with each first frequency point according to the sending situation of the first signal on each first frequency point includes at least one of the following:

[0395] Sending a cell search synchronization signal on the frequency point group associated with the first frequency point where the first signal is sent;

[0396] Sending a cell search synchronization signal on the frequency point group associated with the first frequency point where the first signal is not sent.

[0397] In one embodiment, the first signal includes at least one of the following:

[0398] A dedicated sequence;

[0399] A primary synchronization sequence;

[0400] A secondary synchronization sequence;

[0401] A signal of an on-off keying waveform;

[0402] A signal of a frequency shift keying waveform.

[0403] In one embodiment, the first signal is a fixed signal;

[0404] Wherein, the first communication node determines whether to perform cell search based on cell search synchronization signals on a frequency band group associated with the first frequency band according to whether the first signal is detected on the first frequency band.

[0405] An embodiment of the present application also provides a communication node, Figure 9 which is a schematic structural diagram of a communication node provided by an embodiment of the present application. As shown in Figure 9 the figure, the communication node provided by the embodiment of the present application includes a memory 620, a processor 610, and a computer program stored on the memory and executable on the processor. When the processor 610 executes the program, the above-mentioned cell search method or signal sending method is implemented.

[0406] The communication node may further include a memory 620; the processor 610 in the communication node may be one or more. Here, one processor 610 is taken as an example; the memory 620 is used to store one or more programs; the one or more programs are executed by the one or more processors 610, so that the one or more processors 610 implement the cell search method or signal sending method as described in the embodiment of the present application. Figure 9

[0407] The communication node further includes: a communication device 630, an input device 640, and an output device 650.

[0408] Figure 9 The processor 610, memory 620, communication device 630, input device 640, and output device 650 in the communication node may be connected by a bus or other means. Here, connection by a bus is taken as an example.

[0409]

[0410] The input device 640 can be used to receive input digital or character information, and generate key signal inputs related to user settings and function controls of the communication node. The output device 650 may include a display device such as a display screen.

[0410] The communication device 630 may include a receiver and a transmitter. The communication device 630 is configured to perform information transceiver communication according to the control of the processor 610.

[0411] The memory 620, as a computer-readable storage medium, can be configured to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the cell search method or signal transmission method described in the embodiments of the present application (for example, the frequency point determination module 410, the first signal detection module 420, the cell search module 430, or the frequency point determination module 510, the first signal transmission module 520, the synchronization signal transmission module 530). The memory 620 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the communication node, etc. In addition, the memory 620 can include high-speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some instances, the memory 620 can further include a memory remotely provided relative to the processor 610, and these remote memories can be connected to the communication node through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0412] The embodiments of the present application also provide a storage medium storing a computer program, and when the computer program is executed by a processor, it implements any one of the cell search methods or signal transmission methods in the embodiments of the present application.

[0413] Optionally, the cell search method, applied to a first communication node, includes: determining a first frequency point set and frequency point groups associated with each first frequency point in the first frequency point set; selecting a first frequency point from the first frequency point set and detecting a first signal on the selected first frequency point; and performing cell search according to the detection result.

[0414] Optionally, the signal transmission method, applied to a second communication node, includes: determining at least one first frequency point and frequency point groups associated with each first frequency point; selecting at least one first frequency point from each first frequency point and transmitting a first signal on the selected first frequency point; and transmitting a cell search synchronization signal on the frequency point groups associated with each first frequency point according to the transmission situation of the first signal on each first frequency point.

[0415] The computer storage medium of the embodiments of the present application may adopt any combination of one or more computer-readable media. The computer-readable media may be computer-readable signal media or computer-readable storage media. The computer-readable storage media may be, for example, but not limited to: electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or components, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fibers, portable CD-ROMs, optical storage devices, magnetic storage devices, or any suitable combination of the above. The computer-readable storage media may be any tangible medium that contains or stores a program, which can be used by or in conjunction with an instruction execution system, device, or component.

[0416] The computer-readable signal media may include data signals propagated in a baseband or as part of a carrier wave, which carry computer-readable program codes. Such propagated data signals may take various forms, including but not limited to: electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal media may also be any computer-readable media other than the computer-readable storage media, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, device, or component.

[0417] The program codes contained on the computer-readable media may be transmitted by any suitable medium, including but not limited to: wireless, wire, optical cable, radio frequency (RF), etc., or any suitable combination of the above.

[0418] Computer program code for performing the operations of this application can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0419] Optionally, an embodiment of the present invention further provides a computer program product, including a computer program which, when executed by a processor, implements the cell search method or the signal sending method provided in any embodiment of the present invention.

[0420] As described above, the above are only exemplary embodiments of this application and are not intended to limit the protection scope of this application.

[0421] Those skilled in the art should understand that the term user terminal covers any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable network browser, or a vehicle-mounted mobile station.

[0422] Generally, various embodiments of this application can be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while other aspects can be implemented in firmware or software that can be executed by a controller, a microprocessor, or other computing devices, although this application is not limited thereto.

[0423] Embodiments of this application can be implemented by a data processor of a mobile device executing computer program instructions, for example, in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0424] Any block diagram of a logical process in the accompanying drawings of the present application may represent a program step, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. A computer program may be stored on a memory. The memory may have any type suitable for the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical memory devices and systems (such as digital video disc (DVD) or compact disk (CD), etc.). The computer-readable medium may include a non-transitory storage medium. The data processor may be any type suitable for the local technical environment, such as, but not limited to, a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), and a processor based on a multi-core processor architecture.

[0425] By way of illustrative and non-limiting examples, a detailed description of exemplary embodiments of the present application has been provided above. However, various modifications and adaptations of the above embodiments will be apparent to those skilled in the art when considered in conjunction with the accompanying drawings and the claims, without departing from the scope of the present application. Accordingly, the proper scope of the present application will be determined in accordance with the claims.

Claims

1. A cell search method, characterized in that, Applied to a first communication node, including: Determine a first frequency point set and the frequency point groups associated with each first frequency point in the first frequency point set; Select a first frequency point from the first frequency point set and detect a first signal on the selected first frequency point; Perform cell search according to the detection result.

2. The cell search method according to claim 1, wherein The determining the first frequency point set and the frequency point groups associated with each first frequency point in the first frequency point set includes at least one of the following: Define the first frequency points in the entire frequency range and the frequency point groups associated with the first frequency points, take all the first frequency points included in the frequency band range supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set; Define the first frequency points in each frequency band and the frequency point groups associated with the first frequency points. When the frequency band range supported by the first communication node includes one or more of the frequency bands, take all the first frequency points included in the frequency band range supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set; when the frequency band range supported by the first communication node is less than the frequency range of the frequency band, take all the first frequency points within the frequency band range supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set; Define the first frequency points in each frequency band and the frequency point groups associated with the first frequency points, take all the first frequency points included in one or more frequency bands supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set; Define the first frequency points in the entire frequency range and the frequency point groups associated with the first frequency points, take all the first frequency points in the entire frequency range as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set; Define the first frequency points in each sub-frequency range and the frequency point groups associated with the first frequency points, take all the first frequency points included in one or more sub-frequency ranges supported by the first communication node as the first frequency point set, and determine the frequency point groups associated with each first frequency point in the first frequency point set.

3. The cell search method according to claim 1, wherein The selecting a first frequency point from the first frequency point set includes at least one of the following: Randomly select a first frequency point from the first frequency point set; Select a first frequency point from the first frequency point set in ascending order of frequency; Select a first frequency point from the first frequency point set in descending order of frequency; Select a first frequency point from the first frequency point set according to the frequency point priority; Select a first frequency point from the first frequency point set according to the implementation manner of the first communication node.

4. The cell search method according to claim 1, wherein The performing cell search according to the detection result includes: In the case where the detection result is that a first signal is detected or the intensity of the detected first signal is higher than a predefined threshold, perform cell search on the frequency point group associated with the selected first frequency point; In the case where cell search fails on the frequency band group associated with the selected first frequency band, the detection result is that the first signal is not detected, or the intensity of the detected first signal is less than or equal to a predefined threshold, return to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band; Among them, the selected first frequency band in the step of returning to execute the selection of a first frequency band from the first frequency band set is the first frequency band in the first frequency band set on which the first signal has not been detected.

5. The cell search method according to claim 1, wherein The cell search according to the detection result includes: In the case where the detection result is that the first signal is not detected, perform cell search on the frequency band group associated with the selected first frequency band; In the case where cell search fails on the frequency band group associated with the selected first frequency band, or the detection result is that the first signal is detected, return to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band; Among them, the selected first frequency band in the step of returning to execute the selection of a first frequency band from the first frequency band set is the first frequency band in the first frequency band set on which the first signal has not been detected.

6. The cell search method according to claim 1, wherein, The cell search according to the detection result includes: In the case where the detection result is that the first signal is not detected, perform cell search on the frequency band group associated with the selected first frequency band; If cell search fails on the frequency band group associated with the selected first frequency band, return to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band; Among them, the selected first frequency band in the step of returning to execute the selection of a first frequency band from the first frequency band set is the first frequency band in the first frequency band set on which the first signal has not been detected.

7. The cell search method according to claim 6, wherein After returning to execute the step of selecting a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band, it further includes: If the first signal is not detected on the selected first frequency band in the step of returning to execute the selection of a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band, return to execute the step of performing cell search on the frequency band group associated with the selected first frequency band; If the first signal is detected on the selected first frequency band in the step of returning to execute the selection of a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band, return to execute the step of returning to execute the selection of a first frequency band from the first frequency band set and detecting the first signal on the selected first frequency band.

8. The cell search method according to claim 1, wherein The cell search according to the detection result includes: In the case where the detection result is that the first signal is detected, select a first frequency band that is separated from the selected first frequency band by a preset interval in a preset order from the first frequency band set as the new selected first frequency band, and detect the first signal on the new selected first frequency band; In the case where the detection result of the newly selected first frequency point does not detect the first signal, determine a second frequency point set from the first frequency point set according to the newly selected first frequency point and the preset interval, select a first frequency point from the second frequency point set, detect the first signal at the first frequency point in the selected second frequency point set, and perform cell search according to the detection result of the first frequency point in the selected second frequency point set; In the case where the detection result of the newly selected first frequency point detects the first signal, use the newly selected first frequency point as the selected first frequency point, and return to execute the step of selecting a first frequency point with a preset interval from the first frequency point set according to the preset order as the newly selected first frequency point.

9. The cell search method according to claim 8, wherein The determining a second frequency point set from the first frequency point set according to the newly selected first frequency point and the preset interval includes: Determine all first frequency points starting from the first number of first frequency points before the newly selected first frequency point in the first frequency point set as the second frequency point set; Wherein, the first number is the preset interval minus one.

10. The cell search method according to claim 8, wherein The selecting a first frequency point from the second frequency point set includes at least one of the following: Randomly select a first frequency point from the second frequency point set; Select a first frequency point from the second frequency point set in ascending order of frequency; Select a first frequency point from the second frequency point set in descending order of frequency; Select a first frequency point from the second frequency point set according to the frequency priority; Select a first frequency point from the second frequency point set according to the implementation manner of the first communication node.

11. The cell search method according to claim 8, characterized in that, The performing cell search according to the detection result of the first frequency point in the selected second frequency point set includes: In the case where the detection result of the first frequency point in the selected second frequency point set does not detect the first signal, perform cell search on the frequency point group associated with the first frequency point in the selected second frequency point set; In the case where the cell search on the frequency point group associated with the first frequency point in the selected second frequency point set fails, or the detection result of the first frequency point in the selected second frequency point set detects the first signal, return to execute the step of selecting a first frequency point from the second frequency point set.

12. The cell search method according to claim 8, wherein The preset order includes at least one of the following: Ascending frequency; Descending frequency.

13. The cell search method according to any one of claims 4-12, characterized in that, The performing cell search on the frequency point group associated with the first frequency point includes at least one of the following: Randomly select frequency points from the frequency point group associated with the first frequency point, and perform cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed; Select frequency points from the frequency point group associated with the first frequency point in descending order of frequency in sequence, and perform cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed; Select frequency points in sequence from the frequency point group associated with the first frequency point in ascending order of frequency, and perform cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed; Select frequency points in sequence from the frequency point group associated with the first frequency point according to the frequency point priority, and perform cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed; Select frequency points from the frequency point group associated with the first frequency point according to the implementation mode of the first communication node, and perform cell search on the selected frequency points until the cell search is successful or all frequency points in the frequency point group are traversed.

14. The cell search method according to claim 4, wherein Performing cell search on the frequency point group associated with the first frequency point further includes: Select one or more frequency points from the frequency point group associated with the first frequency point based on the frequency point information indicated by the detected first signal for cell search.

15. The cell search method according to claim 14, wherein The frequency point information indicated by the first signal includes: The transmission situation of the synchronization signal / physical broadcast channel block (SSB) on each frequency point in the frequency point group associated with the first frequency point, or the frequency points for cell search in the frequency point group associated with the first frequency point.

16. The cell search method according to any one of claims 1-12, characterized in that, The first signal includes at least one of the following: Dedicated sequence; Primary synchronization sequence; Secondary synchronization sequence; On-off keying waveform signal; Frequency shift keying waveform signal.

17. The cell search method according to any one of claims 1-12, characterized in that, The first signal is a fixed signal; Wherein, the first communication node determines whether to perform cell search on the frequency point group associated with the first frequency point according to whether the first signal is detected on the first frequency point.

18. The cell search method according to any one of claims 1-12, characterized in that, In the case that there is a synchronization grid not included in any frequency point group associated with the first frequency point within the frequency band range supported by the first communication node, include the unincluded synchronization grid in the frequency point group associated with a specific first frequency point in the first frequency point set.

19. The cell search method according to claim 18, wherein The synchronization grid within the frequency band range supported by the first communication node is related to the bandwidth capability of the first communication node or the service type supported by the first communication node.

20. A signal sending method, characterized in that, Applied to the second communication node, it includes: Determine at least one first frequency point and the frequency point group associated with each first frequency point; Select at least one first frequency point from each of the first frequency points and send a first signal on the selected first frequency point; According to the transmission situation of the first signal on each first frequency point, send cell search synchronization signals on the frequency point groups associated with each first frequency point.

21. The signal sending method according to claim 20, wherein The sending cell search synchronization signals on the frequency point groups associated with each first frequency point according to the transmission situation of the first signal on each first frequency point includes at least one of the following: Send cell search synchronization signals on the frequency point group associated with the first frequency point where the first signal is sent; Send cell search synchronization signals on the frequency point group associated with the first frequency point where the first signal is not sent.

22. The signal sending method according to claim 20 or 21, characterized in that, The first signal includes at least one of the following: Dedicated sequence; Primary synchronization sequence; Secondary synchronization sequence; On-off keying waveform signal; Frequency shift keying waveform signal.

23. The signal transmission method according to claim 20 or 21, characterized in that, The first signal is a fixed signal; Among them, the first communication node determines whether to perform cell search based on the cell search synchronization signal on a frequency point group associated with the first frequency point according to whether the first signal is detected on the first frequency point.

24. A communication node, characterized in that, Including: A memory, a processor, a program stored on the memory and executable on the processor, and a data bus for realizing connection communication between the processor and the memory. When the program is executed by the processor, it realizes the steps of the cell search method according to any one of claims 1-19 or the signal sending method according to any one of claims 20-23.

25. A storage medium for computer-readable storage, characterized in that, The storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to realize the steps of the cell search method according to any one of claims 1-19 or the signal sending method according to any one of claims 20-23.

26. A computer program product includes a computer program, and when the computer program is executed by a processor, it realizes the steps of the cell search method according to any one of claims 1-19 or the signal sending method according to any one of claims 20-23.

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