Cell search method and apparatus, device, and medium

Abstract

The present application relates to the field of mobile communications, and discloses a cell search method and apparatus, a device, and a medium. The method comprises: searching for first information at a preset frequency location, the first information being used for indicating a range in which system information is to be searched for, and the system information being used for a cell search. A terminal searches for first information at a preset frequency location, and then obtains, by means of the indication of the first information, a range in which system information for a cell search is to be searched for, such that a cell search process can be enhanced. Since the terminal only needs to perform searching at a small number of preset frequency locations to obtain the range in which the system information is to be searched for, blind searching in a system information acquisition process performed by the terminal can be reduced, such that delay in a cell search conducted on the basis of the system information is reduced, thereby achieving a rapid cell search, and reducing power consumption of the terminal.

Description

Cell search method, device, equipment and medium Technical Field

[0001] The present application relates to the field of mobile communications, and in particular to a cell search method, apparatus, device, and medium. Background Art

[0002] Common channels and signals in the New Radio (NR) system, such as the Physical Broadcast Channel (PBCH) and Synchronization Signal (SS), need to cover the entire cell through multi-beam scanning to facilitate reception by terminals within the cell. Multi-beam transmission of PBCH and SS is achieved by defining SS / PBCH burst sets. An SS / PBCH burst set contains one or more SS / PBCH blocks (also called Synchronization Signal Block (SSB) in the NR system). An SS / PBCH block is used to carry the SS and PBCH of one beam.

[0003] The terminal can perform cell search by acquiring the information carried by the SSB. The specific implementation process of the terminal performing cell search requires further discussion and research.

[0004] Summary of the Invention

[0005] This application provides a cell search method, apparatus, device, and medium. The technical solution is as follows:

[0006] According to one aspect of the present application, a cell search method is provided, the method being performed by a terminal, the method comprising:

[0007] Searching for first information at a preset frequency position, where the first information is used to indicate a search range for system information;

[0008] The system information is used for cell search.

[0009] According to another aspect of the present application, a cell search method is provided, the method being performed by a network device, the method comprising:

[0010] Sending first information at a preset frequency position, where the first information is used to indicate a search range for system information;

[0011] The system information is used for cell search.

[0012] According to another aspect of the present application, a cell search device is provided, the device comprising:

[0013] a receiving module, configured to search for first information at a preset frequency position, where the first information is used to indicate a search range for system information;

[0014] The system information is used for cell search.

[0015] According to another aspect of the present application, a cell search device is provided, the device comprising:

[0016] a sending module, configured to send first information at a preset frequency position, where the first information is used to indicate a search range for system information;

[0017] The system information is used for cell search.

[0018] According to another aspect of the present application, a terminal is provided, comprising: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor; wherein the terminal is configured to load and execute the executable instructions to implement the cell search method as described in the above aspects.

[0019] According to another aspect of the present application, a network device is provided, comprising: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor; wherein the network device is configured to load and execute the executable instructions to implement the cell search method as described in the above aspects.

[0020] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores executable instructions, and the executable instructions are loaded and executed by a processor to implement the cell search method as described in the above aspects.

[0021] According to another aspect of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions. When the chip runs on a computer device, it is used to implement the cell search method described in the above aspects based on the programmable logic circuit and / or program instructions.

[0022] According to another aspect of the present application, a computer program product or computer program is provided, wherein the computer program product or computer program includes computer instructions, wherein the computer instructions are stored in a computer-readable storage medium, and a processor reads and executes the computer instructions from the computer-readable storage medium, so that a computer device performs the cell search method described in the above aspects.

[0023] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0024] By having the terminal search for the first information at a preset frequency location and obtaining the search range of system information for cell search based on the indication of the first information, the cell search process can be enhanced. Since the terminal can obtain the search range of system information, such as at least one of the frequency domain range and the time domain range of the system information, by searching only a small number of preset frequency locations, blind searches during the terminal's acquisition of system information can be reduced, thereby reducing the latency of cell searches based on system information, enabling rapid cell searches, and reducing power consumption of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] FIG1 is a schematic diagram of an SSB provided by an exemplary embodiment of the present application;

[0027] FIG2 is a schematic diagram of a process of instructing a cell to define an SSB, provided by an exemplary embodiment of the present application;

[0028] FIG3 is a schematic diagram of a frequency range indication process provided by an exemplary embodiment of the present application;

[0029] FIG4 is a schematic diagram of a system architecture of a communication system provided by an exemplary embodiment of the present application;

[0030] FIG5 is a flowchart of a cell search method provided by an exemplary embodiment of the present application;

[0031] FIG6 is a flowchart of a cell search method provided by an exemplary embodiment of the present application;

[0032] FIG7 is a flowchart of a cell search method provided by an exemplary embodiment of the present application;

[0033] FIG8 is a schematic diagram of a preset frequency position provided by an exemplary embodiment of the present application;

[0034] FIG9 is a schematic diagram of a first frequency range provided by an exemplary embodiment of the present application;

[0035] FIG10 is a schematic diagram of a first frequency range provided by an exemplary embodiment of the present application;

[0036] FIG11 is a time domain schematic diagram of first information and system information provided by an exemplary embodiment of the present application;

[0037] FIG12 is a block diagram of a cell search apparatus provided by an exemplary embodiment of the present application;

[0038] FIG13 is a block diagram of a cell search apparatus provided by an exemplary embodiment of the present application;

[0039] FIG14 is a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings. Exemplary embodiments will be described in detail herein, with examples shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0041] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0042] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0043] First, some terms involved in the embodiments of this application are introduced as follows:

[0044] Introduction to the SS / PBCH block in NR:

[0045] Common channels and signals in the NR system, such as the broadcast channel (PBCH) and synchronization signal (SS), need to cover the entire cell through multi-beam scanning to facilitate reception by terminals within the cell. Multi-beam transmission of broadcast channels and synchronization signals is achieved by defining SS / PBCH burst sets. An SS / PBCH burst set contains one or more SS / PBCH blocks (also called SSBs in the NR system). An SS / PBCH block is used to carry the synchronization signal and broadcast channel of a beam. Therefore, an SS / PBCH burst set can contain the synchronization signals of the number of SS blocks (Block) in the cell. The maximum number of SS blocks L is related to the system frequency band, as follows:

[0046] When the system frequency band ranges up to 3 GHz, L is 4;

[0047] In the system frequency band range, L is 8;

[0048] When the system frequency band ranges from 6 GHz to 52.6 GHz, L is 64.

[0049] An SS / PBCH block (SSB) contains one symbol of the primary synchronization signal (PSS), one symbol of the secondary synchronization signal (SSS) and two symbols of NR-PBCH (PBCH).

[0050] For example, Figure 1 is a schematic diagram of SSB provided by an exemplary embodiment of the present application. As shown in Figure 1, in the time domain, PSS101 occupies symbol 0 for transmission, SSS102 occupies symbol 2 for transmission, and PBCH103 occupies symbols 1, 2, and 3 for transmission. In the frequency domain, SSB occupies 20 physical resource blocks (PRBs), that is, 240 resource elements (REs) (subcarriers) for transmission. Among them, the time-frequency resources occupied by PBCH103 also include resources for transmitting a demodulation reference signal (DMRS), which is used for demodulation of PBCH.

[0051] All SS / PBCH blocks within an SS / PBCH burst set are transmitted within a 5ms (half-frame) time window and are repeated at a certain period. This period is configured through the high-level parameter SSB-timing, which can be 5ms, 10ms, 20ms, 40ms, 80ms, or 160ms. The terminal obtains the SSB index from the received SS / PBCH block. The SSB index corresponds to the relative position of the SSB within the 5ms time window. The terminal achieves frame synchronization based on this information and the half-frame indicator carried in the PBCH. The SS / PBCH block index is indicated by the PBCH DMRS or information carried by the PBCH.

[0052] Introduction to synchroniztion raster:

[0053] For the wireless spectrum in NR, the frequency domain position of the SSB is defined by a synchronization grid (synchronization signal grid). For example, Table 1 shows the synchronization grids for different frequency ranges.

[0054] Table 1

[0055] As shown in Table 1, in different frequency ranges, the possible frequency domain position of SSB (the position of the synchronization grid) is determined by the formula in the table, and the parameter SS is used to determine the possible frequency domain position of SSB (the position of the synchronization grid). REF To number, M and N are intermediate parameters.

[0056] After the terminal determines the synchronization grid, the resource mapping of the SSB is determined according to the information shown in Table 2.

[0057] Table 2

[0058] As shown in Table 2, the synchronization grid is located in the PRB numbered 10 among the 20 PRBs of the synchronization signal block, and is located in the RE numbered 0 in the PRB.

[0059] For the synchronization grid, under different system frequency bands (operating bands), the distribution of the synchronization grid within the system frequency band can be determined by the information shown in Table 3.

[0060] Table 3

[0061] For example, as shown in Table 3, for frequency band n77, the synchronization grid number ranges from 7711 to 8329, for a total of 619 synchronization grids. This number is called the Global Synchronization Channel Number (GSCN).

[0062] Introducing the instructions for SSB:

[0063] In the NR system, SSB can be used for the initial access of the terminal (cell search), and can also be configured as a measurement reference signal to the terminal for measurement. The former is used for the terminal to access the cell, its frequency domain position is located on the synchronization grid, and it is associated with the System Information Block 1 (SIB1) information, while the latter is not associated with SIB1 information. Even if its frequency domain position is also located on the synchronization grid, it cannot be used for the terminal to access the cell. The SSB associated with SIB1 is called a cell-defining SSB, and the SSB not associated with SIB1 is called a non-cell-defining SSB. In other words, the terminal can only access the cell through the cell-defining SSB. Due to the flexibility of the NR system design, the non-cell-defining SSB can also be configured on the frequency domain position of the synchronization grid. For a terminal that is initially accessing, when searching for an SSB based on the synchronization grid, these two types of SSBs may be searched. When a non-cell-defined SSB is searched, since the SSB is not associated with SIB1 information, the terminal cannot obtain the control information for receiving SIB1 through the Master Information Block (MIB) information carried by the PBCH in the SSB. The terminal must continue to search for the cell-defined SSB to access the cell. NR supports a network-assisted cell search solution. The base station can carry an indication information in the non-cell-defined SSB to indicate the frequency offset between the GSCN where the cell-defined SSB is located and the GSCN where the currently searched non-cell-defined SSB is located. In this way, even if the terminal detects a non-cell-defined SSB, it can determine the GSCN where the cell-defined SSB is located through the indication information carried therein. Therefore, the terminal can directly search for the cell-defined SSB at the target GSCN location based on this auxiliary information, thereby avoiding the terminal's blind search for the cell-defined SSB and reducing the delay and power consumption of the cell search. The GSCN offset information is indicated by the information carried by the PBCH.

[0064] The information carried by PBCH includes 8 bits of information in MIB information and physical layer information. The physical layer information includes the system frame number (SFN), half-frame indication, SSB index, etc. The MIB information carried by PBCH includes 6 bits of SFN information field, 1 bit of subcarrier spacing information field, 4 bits of SSB subcarrier offset information field, and 8 bits of pdcch-ConfigSIB1 information field. Among them, the 8 bits of pdcch-ConfigSIB1 information field are used to indicate the search space information of the PDCCH that carries the scheduling information of the physical downlink control channel (PDCCH) of SIB1. The subcarrier offset information field of SSB is used to indicate the value k of the subcarrier offset between SSB and control resource set (CORESET) #0. SSB The offset range includes 0-23 and 0-11 subcarriers, which are represented by 5 bits (subcarrier offset information field of SSB in MIB and 1 physical layer signaling bit) and 4 bits respectively, and the corresponding frequency ranges are Frequency Range 1 (FR1) and Frequency Range 2 (FR2). SSB =0-23(FR1) or k SSB =0-11(FR2), it means the current SSB is associated with SIB1. SSB >23(FR1) or k SSB >11(FR2),k SSB The value of is used by the network to indicate that the current SSB is not associated with SIB1. At this time, the network can indicate the location of the synchronization grid of the cell to define the SSB, specifically through k SSB The bits in the pdcch-ConfigSIB1 information field jointly indicate the GSCN of the cell-defined SSB. Since the pdcch-ConfigSIB1 information field contains 8 bits, by indicating the GSCN of the cell-defined SSB and the offset of the GSCN of the current non-cell-defined SSB, the positions of 256 synchronization grids can be indicated. Combined with the different values ​​in the subcarrier offset information field of the SSB, the indication range can be further expanded to indicate the positions of N*265 synchronization grids. For FR1 and FR2, respectively, according to the contents shown in the following Table 4 and the contents shown in the following Table 5, through k SSB The offset between the GSCN of the synchronization grid corresponding to the cell-defined SSB and the GSCN of the synchronization grid corresponding to the currently detected non-cell-defined SSB is determined by the formula Get the GSCN of the synchronization grid where the indicated cell defines the SSB. Indicates the GSCN of non-cell defined SSB, Indicates the offset between the GSCN of the cell-defined SSB and the GSCN of the current non-cell-defined SSB. The GSCN offset range indicated in Table 4 includes (-768...-1, 1...768), and the GSCN offset range indicated in Table 5 includes (-256...-1, 1...256). SSB =30 is the reserved value (Reserved), k in Table 5 SSB =14 is a reserved value.

[0065] Table 4

[0066] Table 5

[0067] For example, Figure 2 is a schematic diagram of a process for indicating a cell-defined SSB provided by an exemplary embodiment of the present application. As shown in Figure 2, the base station indicates the GSCN where the cell-defined SSB 202 is located by combining the GSCN offset indication information carried in the non-cell-defined SSB 201 with the synchronization grid where the non-cell-defined SSB 201 is located.

[0068] There is another scenario for cell search. The operator may not deploy cell definition SSB on some carriers (for example, carriers used only as secondary cells) or frequency bands. In this case, the terminal does not actually need to search for cells in these frequency ranges. If the network can indicate the frequency range to the terminal, the terminal can search for cells outside the frequency range, thereby reducing the delay and power consumption of the terminal trying to search for cells. Similarly, the network uses k SSB The bits in the pdcch-ConfigSIB1 information field jointly indicate the frequency range information. SSB =31 or k corresponding to FR2 SSB =15, the terminal is considered to be in the GSCN range There is no cell-defined SSB, where and They are indicated by the high-order 4 bits and low-order 4 bits of the pdcch-ConfigSIB1 information field respectively.

[0069] For example, FIG3 is a schematic diagram of a frequency range indication process provided by an exemplary embodiment of the present application. As shown in FIG3, in the process of the network-assisted cell search, the synchronization grid where the SSB301 is located is defined by the non-cell, combined with the network indication and The range of the synchronization grid where no cell-defined SSB exists can be obtained, that is, the GSCN start point 302 to the GSCN end point 303.

[0070] In the above solution, the terminal performs cell search by searching for synchronization signals within a frequency band. This process requires the terminal to blindly search for synchronization signals at certain frequency locations to determine whether a cell is deployed. This results in cell search latency and terminal power consumption. In the NR system, network-assisted cell search is introduced, allowing the terminal to determine the frequency location of a cell-defined SSB when searching for a non-cell-defined SSB, thereby reducing cell search latency and terminal power consumption. However, during this process, the terminal still needs to search for synchronization signals at all frequency locations within a frequency band, which does not reduce the latency and power consumption associated with the SSB search.

[0071] The method provided in the embodiment of the present application is that the terminal searches for the first information at a preset frequency position, and obtains the search range of the system information for cell search through the indication of the first information, such as at least one of the frequency domain range and the time domain range of the system information. In the NR system and subsequent evolution systems, such as the 6th Generation Mobile Communication Technology (6G) system, the scheme provided in the embodiment of the present application can be adopted for system design to enhance the cell search process. Since the method provided in the embodiment of the present application can reduce the blind search in the process of the terminal acquiring the system information, the delay of the cell search based on the system information can be reduced, and a fast cell search can be achieved while reducing the power consumption of the terminal.

[0072] 4 shows a schematic diagram of a system architecture of a communication system 400 provided in one embodiment of the present application. The system architecture may include: a terminal 10 , an access network device 20 , and a core network device 30 .

[0073] The terminal 10 may refer to a UE (User Equipment), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent, or a user apparatus. Alternatively, the terminal may be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal in a 5GS (5th Generation System) or a terminal in a future-evolved PLMN (Public Land Mobile Network), etc., and the embodiments of the present application are not limited thereto. For the convenience of description, the above-mentioned devices are collectively referred to as terminals.

[0074] It should be noted that there are usually multiple terminals 10. One or more terminals 10 can be distributed within each cell managed by the access network device 20. Furthermore, one or more terminals 10 can also be distributed outside the cell managed by the access network device 20. Different terminals 10 can communicate with each other based on sidelinks.

[0075] Access network equipment 20 is a device deployed in an access network to provide wireless communication capabilities for terminal 10. Access network equipment 20 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different wireless access technologies, the names of devices that provide access network equipment functions may vary. For example, in 5G NR systems, they are referred to as gNodeBs or gNBs. As communication technologies evolve, the term "access network equipment" may change. For ease of description, in the embodiments of this application, the aforementioned devices that provide wireless communication capabilities for terminal 10 are collectively referred to as access network equipment. Optionally, a communication relationship can be established between terminal 10 and core network equipment 30 through access network equipment 20. For example, in a Long Term Evolution (LTE) system, access network equipment 20 may be an Evolved Universal Terrestrial Radio Access Network (EUTRAN) or one or more eNodeBs in EUTRAN; in a 5G NR system, access network equipment 20 may be a RAN or one or more gNBs in the RAN.

[0076] The core network equipment 30 primarily provides user connectivity, user management, and service bearering, serving as a bearer network interface to external networks. For example, the core network equipment in a 5G NR system may include devices such as an AMF (Access and Mobility Management Function) entity, a UPF (User Plane Function) entity, and an SMF (Session Management Function) entity. The access network equipment 20 and the core network equipment 30 may be collectively referred to as network equipment.

[0077] In one example, the access network device 20 and the core network device 30 communicate with each other via an air technology, such as the NG interface in a 5G NR system. The access network device 20 and the terminal 10 communicate with each other via an air technology, such as the Uu interface. The terminals 10 communicate with each other via an air technology, such as the PC5 interface.

[0078] FIG5 is a flowchart of a cell search method provided by an exemplary embodiment of the present application. The method may be executed by a terminal. The method includes:

[0079] Step 502: Search for first information at a preset frequency position.

[0080] The first information is used to indicate a search range for system information, which can also be equivalently understood as either the first information being used to narrow the search range for system information or the first information being used to locate the search range for system information. The search range for system information includes at least one of a location of the system information in the frequency domain and a location in the time domain. That is, the first information is used to instruct the terminal to obtain system information.

[0081] The preset frequency position is a preset frequency position for searching for the first information. In some embodiments, information indicating the preset frequency position is set in the terminal or in a Subscriber Identity Module (SIM) card of the terminal.

[0082] In some embodiments, when the first information is used to narrow the search range of system information, the search range of the system information before narrowing is defined by a preset first frequency position for searching the system information. In some embodiments, the first frequency position refers to the frequency position of the synchronization grid. That is, the indication of the first information can narrow the search range of the system information indicated by the synchronization grid. For example, the search range of the system information indicated by the first information may be smaller than the search range of the system information indicated by the first frequency position, or the first information can indicate the degree of narrowing or the method of narrowing the search range of the system information indicated by the first frequency position.

[0083] For the specific content of the first information being used to narrow the search scope of system information, the first information being used to locate the search scope of system information, and the first information being used to indicate the search scope of system information, please refer to the description below, and the embodiments of the present application will not be described here.

[0084] The above-mentioned system information is used for cell search. In some embodiments, the system information includes at least one of PBCH, SS, PSS, SSS, and SSB, and the SSB includes at least one of a cell-defined SSB and a non-cell-defined SSB. In some embodiments, the first information is different from the system information. In some embodiments, the system information may also be referred to as broadcast information, cell search information, system signal, broadcast signal, cell search signal, etc. The embodiments of the present application do not limit the specific name of the system information.

[0085] In some embodiments, the first information is used to indicate at least one of the following information:

[0086] Frequency domain location of system information;

[0087] The temporal location of system information;

[0088] The number of system information included in the system information set;

[0089] Communication parameters corresponding to system information.

[0090] The system information set is a set of system information. In some embodiments, the system information is an SSB, and the system information set is an SS / PBCH burst set. The system information set is used to implement multi-beam transmission of the system information, i.e., each piece of system information corresponds to a beam. The communication parameters corresponding to the system information are used to reflect the relevant parameters used to transmit the system information, such as the subcarrier spacing corresponding to the system information.

[0091] In some embodiments, the first information is a first signal. In some embodiments, the first signal includes at least one of the following:

[0092] Synchronization signal;

[0093] Reference signal.

[0094] In some embodiments, the synchronization signal includes at least one of a PSS and an SSS. The reference signal includes at least one of a tracking reference signal (TRS) and a DMRS. It should be noted that the type of the first signal is merely an example, and the first signal can also be other types of signals, such as signals other than the synchronization signal and reference signal, and this is not limited in the present embodiment.

[0095] In some embodiments, the format of the first signal is a sequence. For example, the first signal uses a ZC sequence or an m sequence. In some embodiments, the first signal and the synchronization signal used for cell search use different sequences.

[0096] In some embodiments, the sequence used by the first signal is related to the indication information carried by the first signal, and the indication information includes at least one of the first indication information, the second indication information, the third indication information, and the fourth indication information. The first indication information is used to indicate the frequency domain position of the system information, the second indication information is used to indicate the time domain position of the system information, the third indication information is used to indicate the number of system information included in the system information set, and the fourth indication information is used to indicate the communication parameters corresponding to the system information. For example, when generating the sequence used by the first signal, 8 types can be generated, so that the sequence can be regarded as carrying 3 bits of information, and the content contained in the above-mentioned indication information can be implicitly indicated through the 3 bits of information. In cases where more information needs to be carried, the first signal can be made to carry more bits of information to achieve this.

[0097] In some embodiments, the first information is a first channel. In some embodiments, the first channel includes at least one of the following:

[0098] PBCH;

[0099] PDCCH;

[0100] Index channel;

[0101] Search channel.

[0102] In some embodiments, when the first channel is a PBCH, the format of the first channel and the PBCH in the SSB used for cell search may be the same or different. When the first channel is a PDCCH, the format of the first channel and the PDCCH mainly used to carry control information in the related art may be the same or different. The first channel carries the indication information carried by the above-mentioned first information through the bits carried in the channel. It should be noted that the type of the above-mentioned first channel is only used as an example, and the first channel can also be other types of channels, for example, channels other than the channels described in the above examples, such as other channels that carry broadcast, control, system and other information, and the embodiments of the present application do not limit this.

[0103] Settings for preset frequency positions:

[0104] The preset frequency position is located in the system frequency band, and there are one or more preset frequency positions in the system frequency band. In some embodiments, the system frequency band is a frequency band supported by the mobile communication system or network device currently accessible to the terminal, or a frequency band supported by the terminal's current operator. The frequency band supported by the operator can be indicated by information carried in the SIM card.

[0105] In some embodiments, there are multiple preset frequency locations in the system frequency band. The preset frequency locations are spaced apart, and the frequency domain spacing between adjacent preset frequency locations is the same. In some embodiments, the frequency domain spacing is predefined. In some embodiments, the frequency domain spacing is preconfigured, for example, via information carried in a SIM card.

[0106] In some embodiments, there are multiple preset frequency locations in the system frequency band. The preset frequency locations are spaced apart, and the frequency domain intervals between at least two adjacent sets of preset frequency locations are different. That is, for multiple sets of adjacent preset frequency locations, the frequency domain intervals corresponding thereto may be completely different or partially the same. In some embodiments, the frequency domain interval is predefined. In some embodiments, the frequency domain interval is preconfigured, for example, via information carried in a SIM card.

[0107] In some embodiments, there is a preset frequency position in the system frequency band.

[0108] In some embodiments, the preset frequency position includes a portion of a plurality of first frequency positions, where the first frequency position is a preset frequency position for searching for system information. In some embodiments, the first frequency position is associated with the frequency position of the system information. That is, when the first frequency position is searched, the frequency position of the system information can be obtained.

[0109] In some embodiments, the first frequency position includes a frequency position of a synchronization grid, and the first frequency position can be regarded as a synchronization grid. It should be noted that the embodiments of the present application do not limit the specific name of the first frequency position.

[0110] A portion of synchronization grids is preset in all synchronization grids for the terminal to search for the first information. The preset portion of synchronization grids has a sparser distribution than all synchronization grids. Since the number of the preset portion of synchronization grids is smaller than that of all synchronization grids, the terminal search delay and power consumption can be greatly reduced, which depends on the interval of the synchronization grid. Taking the equal interval distribution of preset frequency positions as an example, if the interval of the preset frequency position (the preset portion of synchronization grids) is N times the interval of the original synchronization grid, that is, one is selected as the preset frequency position from every N synchronization grids, then the number of synchronization grids searched by the terminal is only one-Nth of the original number, where N is a positive integer greater than 1.

[0111] In some embodiments, the preset frequency position includes a frequency position other than a first frequency position, where the first frequency position is a frequency position preset for searching for system information. In some embodiments, the first frequency position includes a frequency position of a synchronization grid. That is, a frequency position is set outside the synchronization grid for the terminal to search for the first information. In some embodiments, the preset frequency position in this case is indicated by an Absolute Radio Frequency Channel Number (ARFCN).

[0112] For the first information indicating the frequency domain position of the system information:

[0113] In some embodiments, the first information carries first indication information, and the first indication information is used to indicate the frequency domain location of the system information. In some embodiments, the first indication information is used to indicate the presence of the system information in one or more first frequency ranges, or the absence of the system information in one or more first frequency ranges.

[0114] In some embodiments, the first frequency range is associated with a preset frequency position, and the terminal can determine the first frequency range based on the preset frequency position. In this case, the first indication information may not need to carry information indicating the first frequency range, but only carry system information indication information, which is used to indicate whether system information exists in the first frequency range. The terminal can determine the first frequency range based on the preset frequency position of the first information currently searched, and in combination with the system information indication information, it can determine whether system information exists in the first frequency range corresponding to the preset frequency position of the first information currently searched.

[0115] In some embodiments, the first frequency range is a frequency range centered on a preset frequency position, and the size of the first frequency range is related to the first frequency domain interval. In some embodiments, the size of the first frequency range is equal to the first frequency domain interval. The first frequency domain interval is the frequency domain interval between a preset frequency position and an adjacent frequency position, and an adjacent frequency position is a preset frequency position adjacent to the preset frequency position (the preset frequency position of the first information currently searched). In some embodiments, the first indication information carries 1 bit of system information indication information, thereby indicating whether there is system information within the first frequency range determined according to the preset frequency position. For example, "0" indicates that there is no system information within the first frequency range, and "1" indicates that there is system information within the first frequency range.

[0116] In some embodiments, the first indication information includes frequency range indication information, where the frequency range indication information is used to indicate one or more first frequency ranges. In some embodiments, the first indication information also includes system information indication information, where the system information indication information is used to indicate whether system information exists for each of the one or more first frequency ranges. In some embodiments, the first frequency range indicated by the frequency range indication information is a frequency range for which system information exists.

[0117] In some embodiments, the frequency range indication information and the system information indication information are implemented as a single message. In some embodiments, the frequency range indication information and the system information indication information are provided separately. The first indication information carries a certain number of bits, thereby carrying the frequency range indication information and the system information indication information. The number of bits is determined based on the content of the frequency range indication information and the system information indication information.

[0118] In some embodiments, the frequency range indication information is used to indicate one or more first frequency ranges within multiple second frequency ranges, where the second frequency range is a predefined frequency range or a preconfigured frequency range. In some embodiments, multiple second frequency ranges are set within the system frequency band according to a predefined bandwidth, and these second frequency ranges are numbered. The frequency range indication information carried by the first indication information is used to indicate the number of one or more second frequency ranges, thereby obtaining one or more first frequency ranges. In some embodiments, the second frequency range indicated by the first indication information is the first frequency range for which system information exists.

[0119] In some embodiments, the frequency range indication information is further used to indicate one or more frequency locations within the first frequency range. The one or more frequency locations are frequency locations where system information exists or does not exist, and the specific details may depend on the number of bits used by the first indication information carried by the first information. In some embodiments, the bits contained in the first indication information are used to indicate the number of the above-mentioned second frequency range and the number of the frequency location within the indicated second frequency range. In this case, it is only necessary to search for the first information at a small number of preset frequency locations in the system frequency band to accurately indicate a large number of frequency domain locations where system information exists or does not exist. For example, a preset frequency location is preset for searching for the first information, which can further reduce the range of the terminal's search for system information. For example, when the terminal performs a cell search within the system frequency band, it can search for the first information at a preset frequency location. Based on the first indication information carried by the first information, it can search for system information at the frequency locations in the first frequency range indicated by the first information, thereby accurately implementing the cell search process.

[0120] For the first information indicating the time domain position of the system information:

[0121] In some embodiments, the first information carries second indication information, and the second indication information is used to indicate a time domain location of the system information. The terminal can search for the system information according to the time domain location of the system information, thereby implementing cell search.

[0122] In some embodiments, the second indication information is used to indicate a time domain offset between the time domain location of the first information and a first time domain unit, where the first time domain unit is the time domain unit where the system information is located. In some embodiments, the time domain offset is indicated by a bit carried by the second indication information.

[0123] In some embodiments, the system information belongs to a system information set, i.e., the system information is a set of system information. In this case, the second indication information is used to indicate the time domain offset between the time domain location of the first information and the time domain unit in which the system information set is located. In some embodiments, the system information includes an SSB, and the system information set includes an SSB set.

[0124] In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is predefined. In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is indicated by the information carried by the first information. The granularity of the time domain unit of the first information includes at least one of a radio frame, a half frame, a subframe, and a time domain symbol. The terminal obtains time synchronization with the network based on the searched first information, and then determines the first time domain unit in which the system information is located in combination with the above-mentioned time domain offset indicated by the second indication information. In some embodiments, in the case of periodic transmission of system information, the above-mentioned time domain offset can be defined as the time domain offset between the first information and the system information closest to the time domain unit in which the first information is located.

[0125] In some embodiments, the timing relationship between the time domain position of the system information and the starting position of the first time domain unit is predefined or preconfigured.

[0126] In some embodiments, the first time domain unit in which the system information is located includes at least one of the following:

[0127] Radio frames;

[0128] Half frame;

[0129] Subframe;

[0130] Time domain symbols.

[0131] In some embodiments, the second indication information is used to indicate a periodicity of the system information. The terminal searches for the system information based on the periodicity of the system information to implement cell search. In some embodiments, the periodicity of the system information is indicated by a bit carried in the second indication information.

[0132] In some embodiments, the second indication information is used to indicate the first time domain unit where the system information is located. That is, the position of the first time domain unit is directly indicated by the second indication information. In some embodiments, the position of the first time domain unit is indicated by a bit carried by the second indication information. For the specific description of the first time domain unit, reference can be made to the foregoing content, and the embodiments of the present application will not be repeated here. For example, in the NR system, the SSB is located within the time range of half a frame of the radio frame, which can be the first half frame or the second half frame, and the second indication information can directly indicate the half frame where the SSB is located.

[0133] Indicates other information for the first information:

[0134] In some embodiments, the first information carries third indication information, and the third indication information is used to indicate the number of system information included in the system information set. In some embodiments, the third indication information is also used to indicate the position of the system information actually sent in the system information set.

[0135] In some embodiments, the system information is an SSB, and the system information set is an SS / PBCH burst set. The system information set is used to implement multi-beam transmission of the system information, i.e., each piece of system information corresponds to a beam. For example, referring to the background introduction, in the case of 3 GHz to 6 GHz, the SSB set includes a maximum of 8 SSBs, but the network device may only transmit some of these SSBs. The third indication information can indicate the SSBs actually transmitted.

[0136] In some embodiments, the first information carries fourth indication information, the fourth indication information being used to indicate communication parameters corresponding to the system information, the communication parameters corresponding to the system information being used to reflect relevant parameters used to transmit the system information. In some embodiments, the communication parameters include subcarrier spacing.

[0137] It should be noted that the first information may carry one or more of the first indication information, second indication information, third indication information, and fourth indication information. Furthermore, each or part of the first indication information, second indication information, third indication information, and fourth indication information may also be carried in different first information.

[0138] It should be noted that the method provided in the embodiment of the present application can be applied to the Long Term Evolution (LTE) system and the NR system. The method provided in the embodiment of the present application can also be applied to the subsequent evolution system of the above-mentioned mobile communication system, such as 6G. In addition, when the method provided in the embodiment of the present application is applied in the above-mentioned mobile communication system, it can be applied to a specified frequency band, a specified terminal, a specified terminal group, a specified terminal type, a specified service, and a specified subsystem. For example, in mobile communication information, only for terminals with power saving requirements, such as applying the method provided in the embodiment of the present application, for each subsystem that constitutes the mobile communication system, the method provided in the embodiment of the present application is applied only to the specified subsystems.

[0139] In summary, the method provided in this embodiment enhances the cell search process by enabling a terminal to search for first information at preset frequency locations and obtain the search range of system information used for cell search based on the indication of the first information. Because the terminal can obtain the search range of system information, such as at least one of the frequency domain range and time domain range of the system information, by searching only a small number of preset frequency locations, blind searches during the terminal's acquisition of system information can be reduced, thereby reducing the latency of cell searches based on system information, enabling rapid cell searches, and simultaneously reducing terminal power consumption.

[0140] FIG6 is a flowchart of a cell search method provided by an exemplary embodiment of the present application. The method may be executed by a network device. The method includes:

[0141] Step 602: Send first information at a preset frequency position.

[0142] The first information is used to indicate a search range for system information, which can also be equivalently understood as either the first information being used to narrow the search range for system information or the first information being used to locate the search range for system information. The search range for system information includes at least one of a location of the system information in the frequency domain and a location in the time domain. That is, the first information is used to instruct the terminal to obtain system information.

[0143] In some embodiments, the network device sends the first information at a preset frequency position by broadcasting.

[0144] The preset frequency position is a preset frequency position for searching for the first information. In some embodiments, information indicating the preset frequency position is set in the terminal or in a SIM card of the terminal.

[0145] In some embodiments, when the first information is used to narrow the search range of system information, the search range of the system information before narrowing is defined by a preset first frequency position for searching the system information. In some embodiments, the first frequency position refers to the frequency position of the synchronization grid. That is, the indication of the first information can narrow the search range of the system information indicated by the synchronization grid. For example, the search range of the system information indicated by the first information may be smaller than the search range of the system information indicated by the first frequency position, or the first information can indicate the degree of narrowing or the method of narrowing the search range of the system information indicated by the first frequency position.

[0146] For the specific content of the first information being used to narrow the search scope of system information, the first information being used to locate the search scope of system information, and the first information being used to indicate the search scope of system information, please refer to the description below, and the embodiments of the present application will not be described here.

[0147] The above-mentioned system information is used for cell search. In some embodiments, the system information includes at least one of PBCH, SS, PSS, SSS, and SSB, and the SSB includes at least one of a cell-defined SSB and a non-cell-defined SSB. In some embodiments, the first information is different from the system information. In some embodiments, the system information may also be referred to as broadcast information, cell search information, system signal, broadcast signal, cell search signal, etc. The embodiments of the present application do not limit the specific name of the system information.

[0148] In some embodiments, the first information is used to indicate at least one of the following information:

[0149] Frequency domain location of system information;

[0150] The temporal location of system information;

[0151] The number of system information included in the system information set;

[0152] Communication parameters corresponding to system information.

[0153] The system information set is a set of system information. In some embodiments, the system information is an SSB, and the system information set is an SS / PBCH burst set. The system information set is used to implement multi-beam transmission of the system information, i.e., each piece of system information corresponds to a beam. The communication parameters corresponding to the system information are used to reflect the relevant parameters used to transmit the system information, such as the subcarrier spacing corresponding to the system information.

[0154] In some embodiments, the first information is a first signal. In some embodiments, the first signal includes at least one of the following:

[0155] Synchronization signal;

[0156] Reference signal.

[0157] In some embodiments, the synchronization signal includes at least one of a PSS and an SSS. The reference signal includes at least one of a TRS and a DMRS. It should be noted that the type of the first signal described above is merely an example, and the first signal can also be other types of signals, such as signals other than the synchronization signal and reference signal described above, and this is not limited in the embodiments of the present application.

[0158] In some embodiments, the format of the first signal is a sequence. For example, the first signal uses a ZC sequence or an m sequence. In some embodiments, the first signal and the synchronization signal used for cell search use different sequences.

[0159] In some embodiments, the sequence used by the first signal is related to indication information carried by the first signal, where the indication information includes at least one of first indication information, second indication information, third indication information, and fourth indication information. The first indication information is used to indicate the frequency domain location of the system information, the second indication information is used to indicate the time domain location of the system information, the third indication information is used to indicate the number of system information included in the system information set, and the fourth indication information is used to indicate the communication parameters corresponding to the system information.

[0160] In some embodiments, the first information is a first channel. In some embodiments, the first channel includes at least one of the following:

[0161] PBCH;

[0162] PDCCH;

[0163] Index channel;

[0164] Search channel.

[0165] In some embodiments, when the first channel is a PBCH, the format of the first channel and the PBCH in the SSB used for cell search may be the same or different. When the first channel is a PDCCH, the format of the first channel and the PDCCH mainly used to carry control information in the related art may be the same or different. The first channel carries the indication information carried by the above-mentioned first information through the bits carried in the channel. It should be noted that the type of the above-mentioned first channel is only used as an example, and the first channel can also be other types of channels, for example, channels other than the channels described in the above examples, such as other channels that carry broadcast, control, system and other information, and the embodiments of the present application do not limit this.

[0166] Settings for preset frequency positions:

[0167] The preset frequency position is located in the system frequency band, and there are one or more preset frequency positions in the system frequency band. In some embodiments, the system frequency band is a frequency band supported by the mobile communication system or network device currently accessible to the terminal, or a frequency band supported by the terminal's current operator. The frequency band supported by the operator can be indicated by information carried in the SIM card.

[0168] In some embodiments, there are multiple preset frequency locations in the system frequency band. The preset frequency locations are spaced apart, and the frequency domain spacing between adjacent preset frequency locations is the same. In some embodiments, the frequency domain spacing is predefined. In some embodiments, the frequency domain spacing is preconfigured, for example, via information carried in a SIM card.

[0169] In some embodiments, there are multiple preset frequency locations in the system frequency band. The preset frequency locations are spaced apart, and the frequency domain intervals between at least two adjacent sets of preset frequency locations are different. That is, for multiple sets of adjacent preset frequency locations, the frequency domain intervals corresponding thereto may be completely different or partially the same. In some embodiments, the frequency domain interval is predefined. In some embodiments, the frequency domain interval is preconfigured, for example, via information carried in a SIM card.

[0170] In some embodiments, there is a preset frequency position in the system frequency band.

[0171] In some embodiments, the preset frequency position includes a portion of a plurality of first frequency positions, where the first frequency position is a preset frequency position for searching for system information. In some embodiments, the first frequency position is associated with the frequency position of the system information. That is, when the first frequency position is searched, the frequency position of the system information can be obtained.

[0172] In some embodiments, the first frequency position includes a frequency position of a synchronization grid, and the first frequency position can be regarded as a synchronization grid. It should be noted that the embodiments of the present application do not limit the specific name of the first frequency position.

[0173] A portion of the synchronization grids is preset in the entire synchronization grid for the terminal to search for the first information. The preset portion of the synchronization grid has a sparser distribution than the entire synchronization grid. Since the preset portion of the synchronization grid is smaller than the entire synchronization grid, the terminal search delay and power consumption can be greatly reduced, depending on the interval between the synchronization grids.

[0174] In some embodiments, the preset frequency position includes a frequency position other than a first frequency position, where the first frequency position is a frequency position preset for searching for system information. In some embodiments, the first frequency position includes a frequency position of a synchronization grid. That is, a frequency position is set outside the synchronization grid for the terminal to search for the first information. In some embodiments, the preset frequency position in this case is indicated by an ARFCN.

[0175] For the first information indicating the frequency domain position of the system information:

[0176] In some embodiments, the first information carries first indication information, and the first indication information is used to indicate the frequency domain location of the system information. In some embodiments, the first indication information is used to indicate the presence of the system information in one or more first frequency ranges, or the absence of the system information in one or more first frequency ranges.

[0177] In some embodiments, the first frequency range is associated with a preset frequency position, and the terminal can determine the first frequency range based on the preset frequency position. In this case, the first indication information may not need to carry information indicating the first frequency range, but only carry system information indication information, which is used to indicate whether system information exists in the first frequency range. The terminal can determine the first frequency range based on the preset frequency position of the first information currently searched, and in combination with the system information indication information, it can determine whether system information exists in the first frequency range corresponding to the preset frequency position of the first information currently searched.

[0178] In some embodiments, the first frequency range is a frequency range centered on a preset frequency position, and the size of the first frequency range is related to the first frequency domain interval. In some embodiments, the size of the first frequency range is equal to the first frequency domain interval. The first frequency domain interval is the frequency domain interval between a preset frequency position and an adjacent frequency position, and the adjacent frequency position is a preset frequency position adjacent to the preset frequency position (the preset frequency position of the first information currently searched). In some embodiments, the first indication information carries 1 bit of system information indication information, thereby indicating whether there is system information within the first frequency range determined according to the preset frequency position.

[0179] In some embodiments, the first indication information includes frequency range indication information, where the frequency range indication information is used to indicate one or more first frequency ranges. In some embodiments, the first indication information also includes system information indication information, where the system information indication information is used to indicate whether system information exists for each of the one or more first frequency ranges. In some embodiments, the first frequency range indicated by the frequency range indication information is a frequency range for which system information exists.

[0180] In some embodiments, the frequency range indication information and the system information indication information are implemented as a single message. In some embodiments, the frequency range indication information and the system information indication information are provided separately. The first indication information carries a certain number of bits, thereby carrying the frequency range indication information and the system information indication information. The number of bits is determined based on the content of the frequency range indication information and the system information indication information.

[0181] In some embodiments, the frequency range indication information is used to indicate one or more first frequency ranges within multiple second frequency ranges, where the second frequency range is a predefined frequency range or a preconfigured frequency range. In some embodiments, multiple second frequency ranges are set within the system frequency band according to a predefined bandwidth, and these second frequency ranges are numbered. The frequency range indication information carried by the first indication information is used to indicate the number of one or more second frequency ranges, thereby obtaining one or more first frequency ranges. In some embodiments, the second frequency range indicated by the first indication information is the first frequency range for which system information exists.

[0182] In some embodiments, the frequency range indication information is also used to indicate one or more frequency positions in the first frequency range. The one or more frequency positions are frequency positions where system information exists or frequency positions where system information does not exist, which may depend on the number of bits used by the first indication information carried by the first information. In some embodiments, the bits contained in the first indication information are used to indicate the number of the above-mentioned second frequency range, and the number of the frequency position within the indicated second frequency range. In this case, it is only necessary to search for the first information at a small number of preset frequency positions in the system frequency band to accurately indicate a large number of frequency domain positions where system information exists or does not exist. For example, a preset frequency position is preset for searching for the first information, which can further reduce the range of the terminal's search for system information.

[0183] For the first information indicating the time domain position of the system information:

[0184] In some embodiments, the first information carries second indication information, and the second indication information is used to indicate a time domain location of the system information. The terminal can search for the system information according to the time domain location of the system information, thereby implementing cell search.

[0185] In some embodiments, the second indication information is used to indicate a time domain offset between the time domain location of the first information and a first time domain unit, where the first time domain unit is the time domain unit where the system information is located. In some embodiments, the time domain offset is indicated by a bit carried by the second indication information.

[0186] In some embodiments, the system information belongs to a system information set, i.e., the system information is a set of system information. In this case, the second indication information is used to indicate the time domain offset between the time domain location of the first information and the time domain unit in which the system information set is located. In some embodiments, the system information includes an SSB, and the system information set includes an SSB set.

[0187] In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is predefined. In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is indicated by the information carried by the first information. The granularity of the time domain unit of the first information includes at least one of a radio frame, a half frame, a subframe, and a time domain symbol. The terminal obtains time synchronization with the network based on the searched first information, and then determines the first time domain unit in which the system information is located in combination with the above-mentioned time domain offset indicated by the second indication information. In some embodiments, in the case of periodic transmission of system information, the above-mentioned time domain offset can be defined as the time domain offset between the first information and the system information closest to the time domain unit in which the first information is located.

[0188] In some embodiments, the timing relationship between the time domain position of the system information and the starting position of the first time domain unit is predefined or preconfigured.

[0189] In some embodiments, the first time domain unit in which the system information is located includes at least one of the following:

[0190] Radio frames;

[0191] Half frame;

[0192] Subframe;

[0193] Time domain symbols.

[0194] In some embodiments, the second indication information is used to indicate a periodicity of the system information. The terminal searches for the system information based on the periodicity of the system information to implement cell search. In some embodiments, the periodicity of the system information is indicated by a bit carried in the second indication information.

[0195] In some embodiments, the second indication information is used to indicate the first time domain unit where the system information is located. That is, the position of the first time domain unit is directly indicated by the second indication information. In some embodiments, the position of the first time domain unit is indicated by a bit carried by the second indication information. For the specific description of the first time domain unit, reference can be made to the foregoing content, and the embodiments of the present application will not be repeated here. For example, in the NR system, the SSB is located within the time range of half a frame of the radio frame, which can be the first half frame or the second half frame, and the second indication information can directly indicate the half frame where the SSB is located.

[0196] Indicates other information for the first information:

[0197] In some embodiments, the first information carries third indication information, and the third indication information is used to indicate the number of system information included in the system information set. In some embodiments, the third indication information is also used to indicate the position of the system information actually sent in the system information set.

[0198] In some embodiments, the system information is an SSB, the system information set is an SS / PBCH burst set, and the system information set is used to implement multi-beam transmission of the system information, that is, each system information corresponds to a beam.

[0199] In some embodiments, the first information carries fourth indication information, the fourth indication information being used to indicate communication parameters corresponding to the system information, the communication parameters corresponding to the system information being used to reflect relevant parameters used to transmit the system information. In some embodiments, the communication parameters include subcarrier spacing.

[0200] It should be noted that the first information may carry one or more of the first indication information, second indication information, third indication information, and fourth indication information. Furthermore, each or part of the first indication information, second indication information, third indication information, and fourth indication information may also be carried in different first information.

[0201] In summary, the method provided in this embodiment enhances the cell search process by transmitting first information at a preset frequency location, allowing the terminal to search for and obtain the first information and, based on the information, determine the search range for system information used for cell search. This allows the terminal to obtain the system information search range, such as at least one of the frequency domain range and time domain range, by searching only a small number of preset frequency locations. This reduces blind searches during the terminal's acquisition of system information, thereby reducing cell search latency, enabling rapid cell searches, and reducing terminal power consumption.

[0202] FIG7 is a flowchart of a cell search method provided by an exemplary embodiment of the present application. The method can be applied to the communication system shown in FIG4. The method includes:

[0203] Step 702: The terminal searches for first information sent by a network device at a preset frequency position.

[0204] The first information is used to indicate a search range for system information, which can also be equivalently understood as either the first information being used to narrow the search range for system information or the first information being used to locate the search range for system information. The search range for system information includes at least one of a location of the system information in the frequency domain and a location in the time domain. That is, the first information is used to instruct the terminal to obtain system information.

[0205] In some embodiments, the network device sends the first information at a preset frequency position by broadcasting.

[0206] The preset frequency position is a preset frequency position for searching for the first information. In some embodiments, information indicating the preset frequency position is set in the terminal or in a SIM card of the terminal.

[0207] In some embodiments, when the first information is used to narrow the search range of system information, the search range of the system information before narrowing is defined by a preset first frequency position for searching the system information. In some embodiments, the first frequency position refers to the frequency position of the synchronization grid. That is, the indication of the first information can narrow the search range of the system information indicated by the synchronization grid. For example, the search range of the system information indicated by the first information may be smaller than the search range of the system information indicated by the first frequency position, or the first information can indicate the degree of narrowing or the method of narrowing the search range of the system information indicated by the first frequency position.

[0208] For the specific content of the first information being used to narrow the search scope of system information, the first information being used to locate the search scope of system information, and the first information being used to indicate the search scope of system information, please refer to the description below, and the embodiments of the present application will not be described here.

[0209] The above-mentioned system information is used for cell search. In some embodiments, the system information includes at least one of PBCH, SS, PSS, SSS, and SSB, and the SSB includes at least one of a cell-defined SSB and a non-cell-defined SSB. In some embodiments, the first information is different from the system information. In some embodiments, the system information may also be referred to as broadcast information, cell search information, system signal, broadcast signal, cell search signal, etc. The embodiments of the present application do not limit the specific name of the system information.

[0210] In some embodiments, the first information is used to indicate at least one of the following information:

[0211] Frequency domain location of system information;

[0212] The temporal location of system information;

[0213] The number of system information included in the system information set;

[0214] Communication parameters corresponding to system information.

[0215] The system information set is a set of system information. In some embodiments, the system information is an SSB, and the system information set is an SS / PBCH burst set. The system information set is used to implement multi-beam transmission of the system information, i.e., each piece of system information corresponds to a beam. The communication parameters corresponding to the system information are used to reflect the relevant parameters used to transmit the system information, such as the subcarrier spacing corresponding to the system information.

[0216] In some embodiments, the first information is a first signal. In some embodiments, the first signal includes at least one of the following:

[0217] Synchronization signal;

[0218] Reference signal.

[0219] In some embodiments, the synchronization signal includes at least one of a PSS and an SSS. The reference signal includes at least one of a TRS and a DMRS. It should be noted that the type of the first signal described above is merely an example, and the first signal can also be other types of signals, such as signals other than the synchronization signal and reference signal described above, and this is not limited in the embodiments of the present application.

[0220] In some embodiments, the format of the first signal is a sequence. For example, the first signal uses a ZC sequence or an m sequence. In some embodiments, the first signal and the synchronization signal used for cell search use different sequences.

[0221] In some embodiments, the sequence used by the first signal is related to indication information carried by the first signal, where the indication information includes at least one of first indication information, second indication information, third indication information, and fourth indication information. The first indication information is used to indicate the frequency domain location of the system information, the second indication information is used to indicate the time domain location of the system information, the third indication information is used to indicate the number of system information included in the system information set, and the fourth indication information is used to indicate the communication parameters corresponding to the system information.

[0222] In some embodiments, the first information is a first channel. In some embodiments, the first channel includes at least one of the following:

[0223] PBCH;

[0224] PDCCH;

[0225] Index channel;

[0226] Search channel.

[0227] In some embodiments, when the first channel is a PBCH, the format of the first channel and the PBCH in the SSB used for cell search may be the same or different. When the first channel is a PDCCH, the format of the first channel and the PDCCH mainly used to carry control information in the related art may be the same or different. The first channel carries the indication information carried by the above-mentioned first information through the bits carried in the channel. It should be noted that the type of the above-mentioned first channel is only used as an example, and the first channel can also be other types of channels, for example, channels other than the channels described in the above examples, such as other channels that carry broadcast, control, system and other information, and the embodiments of the present application do not limit this.

[0228] Settings for preset frequency positions:

[0229] The preset frequency position is located in the system frequency band, and there are one or more preset frequency positions in the system frequency band. In some embodiments, the system frequency band is a frequency band supported by the mobile communication system or network device currently accessible to the terminal, or a frequency band supported by the terminal's current operator. The frequency band supported by the operator can be indicated by information carried in the SIM card.

[0230] In some embodiments, there are multiple preset frequency locations in the system frequency band. The preset frequency locations are spaced apart, and the frequency domain spacing between adjacent preset frequency locations is the same. In some embodiments, the frequency domain spacing is predefined. In some embodiments, the frequency domain spacing is preconfigured, for example, via information carried in a SIM card.

[0231] In some embodiments, there are multiple preset frequency locations in the system frequency band. The preset frequency locations are spaced apart, and the frequency domain intervals between at least two adjacent sets of preset frequency locations are different. That is, for multiple sets of adjacent preset frequency locations, the frequency domain intervals corresponding thereto may be completely different or partially the same. In some embodiments, the frequency domain interval is predefined. In some embodiments, the frequency domain interval is preconfigured, for example, via information carried in a SIM card.

[0232] In some embodiments, there is a preset frequency position in the system frequency band.

[0233] In some embodiments, the preset frequency position includes a portion of a plurality of first frequency positions, where the first frequency position is a preset frequency position for searching for system information. In some embodiments, the first frequency position is associated with the frequency position of the system information. That is, when the first frequency position is searched, the frequency position of the system information can be obtained.

[0234] In some embodiments, the first frequency position includes a frequency position of a synchronization grid, and the first frequency position can be regarded as a synchronization grid. It should be noted that the embodiments of the present application do not limit the specific name of the first frequency position.

[0235] A portion of the synchronization grids is preset in the entire synchronization grid for the terminal to search for the first information. The preset portion of the synchronization grid has a sparser distribution than the entire synchronization grid. Since the preset portion of the synchronization grid is smaller than the entire synchronization grid, the terminal search delay and power consumption can be greatly reduced, depending on the interval between the synchronization grids.

[0236] In some embodiments, the preset frequency position includes a frequency position other than a first frequency position, where the first frequency position is a frequency position preset for searching for system information. In some embodiments, the first frequency position includes a frequency position of a synchronization grid. That is, a frequency position is set outside the synchronization grid for the terminal to search for the first information. In some embodiments, the preset frequency position in this case is indicated by an ARFCN.

[0237] For example, Figure 8 is a schematic diagram of preset frequency positions provided by an exemplary embodiment of the present application. As shown in Figure 8 , a portion of synchronization grids 802 are preset within synchronization grids 801 of the system frequency band. During a cell search, the terminal first searches for first information on these synchronization grids 802. For example, one synchronization grid 801 out of every three synchronization grids 801 in all synchronization grids 801 is selected as the preset synchronization grid 802.

[0238] For the first information carrying the first indication information:

[0239] In some embodiments, the first information carries first indication information, and the first indication information is used to indicate the frequency domain location of the system information. In some embodiments, the first indication information is used to indicate the presence of the system information in one or more first frequency ranges, or the absence of the system information in one or more first frequency ranges.

[0240] In some embodiments, the first frequency range is associated with a preset frequency position, and the terminal can determine the first frequency range based on the preset frequency position. In this case, the first indication information may not need to carry information indicating the first frequency range, but only carry system information indication information, which is used to indicate whether system information exists in the first frequency range. The terminal can determine the first frequency range based on the preset frequency position of the first information currently searched, and in combination with the system information indication information, it can determine whether system information exists in the first frequency range corresponding to the preset frequency position of the first information currently searched.

[0241] In some embodiments, the first frequency range is a frequency range centered on a preset frequency position, and the size of the first frequency range is related to the first frequency domain interval. In some embodiments, the size of the first frequency range is equal to the first frequency domain interval. The first frequency domain interval is the frequency domain interval between a preset frequency position and an adjacent frequency position, and the adjacent frequency position is a preset frequency position adjacent to the preset frequency position (the preset frequency position of the first information currently searched). In some embodiments, the first indication information carries 1 bit of system information indication information, thereby indicating whether there is system information within the first frequency range determined according to the preset frequency position.

[0242] For example, Figure 9 is a schematic diagram of a first frequency range provided by an exemplary embodiment of the present application. As shown in Figure 9, the first information in the frequency range 901 can indicate whether there is system information in the frequency range 901 centered on the preset frequency position where the first information is located. The first information in the frequency range 902 can indicate whether there is system information in the frequency range 902 centered on the preset frequency position where the first information is located. For example, the frequency range 901 includes 10 synchronization grid positions. If the frequency position where the first information in the frequency range 901 is located is also a synchronization grid, then the frequency range 901 also includes the synchronization grid position, that is, a total of 11 synchronization grid positions.

[0243] In some embodiments, the first indication information includes frequency range indication information, where the frequency range indication information is used to indicate one or more first frequency ranges. In some embodiments, the first indication information also includes system information indication information, where the system information indication information is used to indicate whether system information exists for each of the one or more first frequency ranges. In some embodiments, the first frequency range indicated by the frequency range indication information is a frequency range for which system information exists.

[0244] In some embodiments, the frequency range indication information and the system information indication information are implemented as a single message. In some embodiments, the frequency range indication information and the system information indication information are provided separately. The first indication information carries a certain number of bits, thereby carrying the frequency range indication information and the system information indication information. The number of bits is determined based on the content of the frequency range indication information and the system information indication information.

[0245] In some embodiments, the frequency range indication information is used to indicate one or more first frequency ranges within multiple second frequency ranges, where the second frequency range is a predefined frequency range or a preconfigured frequency range. In some embodiments, multiple second frequency ranges are set within the system frequency band according to a predefined bandwidth, and these second frequency ranges are numbered. The frequency range indication information carried by the first indication information is used to indicate the number of one or more second frequency ranges, thereby obtaining one or more first frequency ranges. In some embodiments, the second frequency range indicated by the first indication information is the first frequency range for which system information exists.

[0246] In some embodiments, the frequency range indication information is also used to indicate one or more frequency positions in the first frequency range. The one or more frequency positions are frequency positions where system information exists or frequency positions where system information does not exist, which may depend on the number of bits used by the first indication information carried by the first information. In some embodiments, the bits contained in the first indication information are used to indicate the number of the above-mentioned second frequency range, and the number of the frequency position within the indicated second frequency range. In this case, it is only necessary to search for the first information at a small number of preset frequency positions in the system frequency band to accurately indicate a large number of frequency domain positions where system information exists or does not exist. For example, a preset frequency position is preset for searching for the first information, which can further reduce the range of the terminal's search for system information.

[0247] For example, Figure 10 is a schematic diagram of a first frequency range provided by an exemplary embodiment of the present application. As shown in Figure 10, the system frequency band includes multiple frequency ranges, namely frequency range 1001-frequency range 1004. The first information located at the preset frequency position can indicate one or more of the frequency ranges 1001-frequency range 1004 as the first frequency range, and indicate whether there is system information in the first frequency range. Furthermore, the first information can also further indicate whether there is system information at the frequency position therein for each first frequency range, so that the terminal can quickly search for the system information, thereby completing the cell search. Among them, the frequency position of the first information is preset, but may not be associated with the position of the frequency range 1001-frequency range 1004. Figure 10 is introduced by taking the preset frequency position of the first information in the first synchronization grid in the frequency range 1001 as an example.

[0248] For the first information carrying the second indication information:

[0249] In some embodiments, the first information carries second indication information, and the second indication information is used to indicate a time domain location of the system information. The terminal can search for the system information according to the time domain location of the system information, thereby implementing cell search.

[0250] In some embodiments, the second indication information is used to indicate a time domain offset between the time domain location of the first information and a first time domain unit, where the first time domain unit is the time domain unit where the system information is located. In some embodiments, the time domain offset is indicated by a bit carried by the second indication information.

[0251] In some embodiments, the system information belongs to a system information set, i.e., the system information is a set of system information. In this case, the second indication information is used to indicate the time domain offset between the time domain location of the first information and the time domain unit in which the system information set is located. In some embodiments, the system information includes an SSB, and the system information set includes an SSB set.

[0252] In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is predefined. In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is indicated by the information carried by the first information. The granularity of the time domain unit of the first information includes at least one of a radio frame, a half frame, a subframe, and a time domain symbol. The terminal obtains time synchronization with the network based on the searched first information, and then determines the first time domain unit in which the system information is located in combination with the above-mentioned time domain offset indicated by the second indication information. In some embodiments, in the case of periodic transmission of system information, the above-mentioned time domain offset can be defined as the time domain offset between the first information and the system information closest to the time domain unit in which the first information is located.

[0253] In some embodiments, the timing relationship between the time domain position of the system information and the starting position of the first time domain unit is predefined or preconfigured.

[0254] In some embodiments, the first time domain unit in which the system information is located includes at least one of the following:

[0255] Radio frames;

[0256] Half frame;

[0257] Subframe;

[0258] Time domain symbols.

[0259] In some embodiments, the second indication information is used to indicate a periodicity of the system information. The terminal searches for the system information based on the periodicity of the system information to implement cell search. In some embodiments, the periodicity of the system information is indicated by a bit carried in the second indication information.

[0260] In some embodiments, the second indication information is used to indicate the first time domain unit where the system information is located. That is, the position of the first time domain unit is directly indicated by the second indication information. In some embodiments, the position of the first time domain unit is indicated by a bit carried by the second indication information. For the specific description of the first time domain unit, reference can be made to the foregoing content, and the embodiments of the present application will not be repeated here. For example, in the NR system, the SSB is located within the time range of half a frame of the radio frame, which can be the first half frame or the second half frame, and the second indication information can directly indicate the half frame where the SSB is located.

[0261] For example, Figure 11 is a time domain diagram of first information and system information provided by an exemplary embodiment of the present application. As shown in Figure 11, first information 1101 is located in radio frame 1, and the time unit in which it is located has a predefined timing relationship with the start position of radio frame 1. The second indication information carried by first information 1101 is used to indicate the frame offset, which is the offset between radio frame 1 in which first information 1101 is located and radio frame 2 in which system information 1102 is located. The time unit in which system information 1102 is located has a predefined timing relationship with the start position of radio frame 2. Therefore, the terminal can obtain the time information of system information 1102.

[0262] For the first information carrying other indication information:

[0263] In some embodiments, the first information carries third indication information, and the third indication information is used to indicate the number of system information included in the system information set. In some embodiments, the third indication information is also used to indicate the position of the system information actually sent in the system information set.

[0264] In some embodiments, the system information is an SSB, the system information set is an SS / PBCH burst set, and the system information set is used to implement multi-beam transmission of the system information, that is, each system information corresponds to a beam.

[0265] In some embodiments, the first information carries fourth indication information, the fourth indication information being used to indicate communication parameters corresponding to the system information, the communication parameters corresponding to the system information being used to reflect relevant parameters used to transmit the system information. In some embodiments, the communication parameters include subcarrier spacing.

[0266] In some embodiments, the first information may carry one or more of the first indication information, the second indication information, the third indication information, and the fourth indication information. For example, the first information carries the first indication information, the first information carries the second indication information, the first information carries the third indication information, the first information carries the fourth indication information, the first information carries the first indication information and the second indication information, the first information carries the first indication information and the third indication information, the first information carries the first indication information and the fourth indication information, the first information carries the second indication information and the third indication information, the first information carries the second indication information and the fourth indication information, the first information carries the third indication information and the fourth indication information, the first information carries the first indication information and the second indication information and the third indication information, the first information carries the first indication information and the third indication information, the first information carries the first indication information and the third indication information and the fourth indication information, the first information carries the second indication information and the third indication information and the fourth indication information, the first information carries the first indication information and the second indication information and the third indication information and the fourth indication information.

[0267] In some embodiments, each or part of the first indication information, the second indication information, the third indication information and the fourth indication information may also be carried in different first information.

[0268] It should be noted that the method provided in the embodiment of the present application can be applied to LTE systems and NR systems. The method provided in the embodiment of the present application can also be applied to subsequent evolution systems of the above-mentioned mobile communication systems, such as 6G. In addition, when applying the method provided in the embodiment of the present application in the above-mentioned mobile communication system, it can be applied to a specified frequency band, a specified terminal, a specified terminal group, a specified terminal type, a specified service, and a specified subsystem. For example, in mobile communication information, only for terminals with power saving requirements, such as applying the method provided in the embodiment of the present application, for each subsystem that constitutes the mobile communication system, the method provided in the embodiment of the present application is applied only to the specified subsystems.

[0269] In summary, the method provided in this embodiment enhances the cell search process by transmitting first information at a preset frequency location, allowing the terminal to search for and obtain the first information and, based on its indication, determine the search range for system information used for cell search. This allows the terminal to obtain the search range for system information, such as at least one of the frequency domain range and time domain range of the system information, by searching only a small number of preset frequency locations. This reduces blind searches during the terminal's acquisition of system information, thereby reducing the latency of performing cell searches based on system information, enabling rapid cell searches, and reducing terminal power consumption.

[0270] The method provided in this embodiment also reduces the number of preset frequency locations by spacing the preset frequency locations, thereby improving terminal search efficiency. By selecting a portion of the first frequency locations as preset frequency locations, the system information search speed can be increased and latency reduced compared to searching for system information using the first frequency locations. By setting preset frequency locations outside the first frequency location, flexibility in setting preset frequency locations can be increased.

[0271] By indicating the frequency domain location of the system information using the first information, the terminal can accurately locate the location of the system information in the frequency domain. By associating the first frequency range with a preset frequency location, the amount of information used to indicate the first frequency range can be reduced. By indicating the first frequency range within the second frequency range, the information indicating the first frequency range can be indicated using a small amount of information, and the indication is more flexible. By indicating the frequency location within the first frequency range, the accuracy of searching for system information can be further improved, thereby reducing power consumption and latency of the search.

[0272] By indicating the time domain location of the system information using the second information, the terminal can accurately locate the location of the system information in the time domain. By using a time domain offset to indicate the time domain location of the system information, the time domain location of the system information can be accurately indicated using a small amount of information. By using a period for indicating the system information, the terminal can locate the system information based on the period. By accurately indicating the time domain unit of the system information, the terminal can quickly and accurately locate the time domain location of the system information.

[0273] By indicating the relevant information of the system information set in which the system information is located by the third information, the terminal can obtain the relevant information of the system information set before searching for a cell, thereby improving system efficiency. By indicating the communication parameters corresponding to the system information by the fourth information, the terminal can search for system information based on the communication parameters, thereby helping to improve search efficiency.

[0274] Implementing the first information through a signal or channel can improve the design flexibility of the first information. Using the sequence used by the first information to implicitly indicate the information indicated by the first information can improve system efficiency.

[0275] It should be noted that the order of the method steps provided in the embodiments of the present application can be appropriately adjusted, the steps can also be increased or decreased accordingly according to the circumstances, and different steps can be freely combined to form new embodiments. Any person skilled in the art who is familiar with the present invention can easily think of the method of variation within the technical scope disclosed in this application, and should be included in the protection scope of this application, so it will not be repeated here. In addition, the order of the above-mentioned different situations does not have a preferred meaning, but is only for the convenience of expression.

[0276] FIG12 is a block diagram of a cell search device provided by an exemplary embodiment of the present application, which can be implemented as a terminal or as a part of a terminal through software or hardware or a combination of both.

[0277] The receiving module 1201 is configured to search for first information at a preset frequency position, where the first information is used to indicate a search range of system information; wherein the system information is used for cell search.

[0278] The first information is used to indicate a search range for system information, which can also be equivalently understood as either the first information being used to narrow the search range for system information or the first information being used to locate the search range for system information. The search range for system information includes at least one of the position of the system information in the frequency domain and the position in the time domain, i.e., the first information is used to instruct the terminal to obtain system information. The preset frequency position is a preset frequency position for searching for the first information. In some embodiments, the information indicating the preset frequency position is set in the terminal or in the SIM card of the terminal.

[0279] In some embodiments, when the first information is used to narrow the search range of system information, the search range of the system information before narrowing is defined by a preset first frequency position for searching the system information. In some embodiments, the first frequency position refers to the frequency position of the synchronization grid. That is, the indication of the first information can narrow the search range of the system information indicated by the synchronization grid. For example, the search range of the system information indicated by the first information may be smaller than the search range of the system information indicated by the first frequency position, or the first information can indicate the degree of narrowing or the method of narrowing the search range of the system information indicated by the first frequency position.

[0280] For the specific content of the first information being used to narrow the search scope of system information, the first information being used to locate the search scope of system information, and the first information being used to indicate the search scope of system information, please refer to the description below, and the embodiments of the present application will not be described here.

[0281] The above-mentioned system information is used for cell search. In some embodiments, the system information includes at least one of PBCH, SS, PSS, SSS, and SSB, and the SSB includes at least one of a cell-defined SSB and a non-cell-defined SSB. In some embodiments, the first information is different from the system information. In some embodiments, the system information may also be referred to as broadcast information, cell search information, system signal, broadcast signal, cell search signal, etc. The embodiments of the present application do not limit the specific name of the system information.

[0282] In some embodiments, the first information is used to indicate at least one of the following information:

[0283] Frequency domain location of system information;

[0284] The temporal location of system information;

[0285] The number of system information included in the system information set;

[0286] Communication parameters corresponding to system information.

[0287] The system information set is a set of system information. In some embodiments, the system information is an SSB, and the system information set is an SS / PBCH burst set. The system information set is used to implement multi-beam transmission of the system information, i.e., each piece of system information corresponds to a beam. The communication parameters corresponding to the system information are used to reflect the relevant parameters used to transmit the system information, such as the subcarrier spacing corresponding to the system information.

[0288] In some embodiments, the first information is a first signal. In some embodiments, the first signal includes at least one of the following:

[0289] Synchronization signal;

[0290] Reference signal.

[0291] In some embodiments, the synchronization signal includes at least one of a PSS and an SSS. The reference signal includes at least one of a TRS and a DMRS. It should be noted that the type of the first signal described above is merely an example, and the first signal can also be other types of signals, such as signals other than the synchronization signal and reference signal described above, and this is not limited in the embodiments of the present application.

[0292] In some embodiments, the format of the first signal is a sequence. For example, the first signal uses a ZC sequence or an m sequence. In some embodiments, the first signal and the synchronization signal used for cell search use different sequences.

[0293] In some embodiments, the sequence used by the first signal is related to indication information carried by the first signal, where the indication information includes at least one of first indication information, second indication information, third indication information, and fourth indication information. The first indication information is used to indicate the frequency domain location of the system information, the second indication information is used to indicate the time domain location of the system information, the third indication information is used to indicate the number of system information included in the system information set, and the fourth indication information is used to indicate the communication parameters corresponding to the system information.

[0294] In some embodiments, the first information is a first channel. In some embodiments, the first channel includes at least one of the following:

[0295] PBCH;

[0296] PDCCH;

[0297] Index channel;

[0298] Search channel.

[0299] In some embodiments, when the first channel is a PBCH, the format of the first channel and the PBCH in the SSB used for cell search may be the same or different. When the first channel is a PDCCH, the format of the first channel and the PDCCH mainly used to carry control information in the related art may be the same or different. The first channel carries the indication information carried by the above-mentioned first information through the bits carried in the channel. It should be noted that the type of the above-mentioned first channel is only used as an example, and the first channel can also be other types of channels, for example, channels other than the channels described in the above examples, such as other channels that carry broadcast, control, system and other information, and the embodiments of the present application do not limit this.

[0300] The preset frequency position is located in the system frequency band, and there are one or more preset frequency positions in the system frequency band. In some embodiments, the system frequency band is a frequency band supported by the mobile communication system or network device currently accessible to the terminal, or a frequency band supported by the terminal's current operator. The frequency band supported by the operator can be indicated by information carried in the SIM card.

[0301] In some embodiments, the preset frequency positions occur at intervals, and the frequency domain intervals between adjacent preset frequency positions are the same. In some embodiments, the frequency domain intervals are predefined. In some embodiments, the frequency domain intervals are preconfigured, for example, via information carried in a SIM card.

[0302] In some embodiments, the preset frequency positions are spaced apart, and at least two adjacent sets of the preset frequency positions have different frequency domain intervals. That is, for multiple sets of adjacent preset frequency positions, the frequency domain intervals corresponding thereto may be completely different or partially the same. In some embodiments, the frequency domain interval is predefined. In some embodiments, the frequency domain interval is preconfigured, for example, via information carried in a SIM card.

[0303] In some embodiments, there is a preset frequency position in the system frequency band.

[0304] In some embodiments, the preset frequency position includes a portion of a plurality of first frequency positions; wherein the first frequency position is a preset frequency position for searching for the system information. In some embodiments, the first frequency position is associated with the frequency position of the system information. That is, when the first frequency position is searched, the frequency position of the system information can be obtained.

[0305] In some embodiments, the first frequency position includes a frequency position of a synchronization grid, and the first frequency position can be regarded as a synchronization grid. It should be noted that the embodiments of the present application do not limit the specific name of the first frequency position.

[0306] A portion of the synchronization grids is preset in the entire synchronization grid for the terminal to search for the first information. The preset portion of the synchronization grid has a sparser distribution than the entire synchronization grid. Since the preset portion of the synchronization grid is smaller than the entire synchronization grid, the terminal search delay and power consumption can be greatly reduced, depending on the interval between the synchronization grids.

[0307] In some embodiments, the preset frequency position includes a frequency position other than a first frequency position; wherein the first frequency position is a frequency position preset for searching for the system information. In some embodiments, the first frequency position includes a frequency position of a synchronization grid. That is, a frequency position is set outside the synchronization grid for the terminal to search for the first information. In some embodiments, the preset frequency position in this case is indicated by an ARFCN.

[0308] In some embodiments, the first information carries first indication information, and the first indication information is used to indicate the frequency domain position of the system information.

[0309] In some embodiments, the first indication information is used to indicate that the system information exists in one or more first frequency ranges, or that the system information does not exist in the one or more first frequency ranges.

[0310] In some embodiments, the first frequency range is associated with the preset frequency position. In this case, the first indication information may not need to carry information indicating the first frequency range, but only carry system information indication information, where the system information indication information is used to indicate whether system information exists in the first frequency range. The terminal can determine the first frequency range based on the preset frequency position of the first information currently searched, and can determine whether system information exists in the first frequency range corresponding to the preset frequency position of the first information currently searched in combination with the system information indication information.

[0311] In some embodiments, the first frequency range is a frequency range centered on the preset frequency position, and the size of the first frequency range is related to a first frequency domain interval; wherein the first frequency domain interval is a frequency domain interval between the preset frequency position and an adjacent frequency position, and the adjacent frequency position is a preset frequency position adjacent to the preset frequency position. In some embodiments, the first indication information carries 1 bit of system information indication information, thereby indicating whether system information exists within the first frequency range determined according to the preset frequency position.

[0312] In some embodiments, the first indication information includes frequency range indication information; wherein the frequency range indication information is used to indicate the one or more first frequency ranges. In some embodiments, the first indication information also includes system information indication information, wherein the system information indication information is used to indicate whether system information exists for each of the one or more first frequency ranges. In some embodiments, the first frequency range indicated by the frequency range indication information is a frequency range for which system information exists.

[0313] In some embodiments, the frequency range indication information and the system information indication information are implemented as a single message. In some embodiments, the frequency range indication information and the system information indication information are provided separately. The first indication information carries a certain number of bits, thereby carrying the frequency range indication information and the system information indication information. The number of bits is determined based on the content of the frequency range indication information and the system information indication information.

[0314] In some embodiments, the frequency range indication information is used to indicate the one or more first frequency ranges within a plurality of second frequency ranges; wherein the second frequency range is a predefined frequency range or a preconfigured frequency range. In some embodiments, multiple second frequency ranges are set within a system frequency band according to a predefined bandwidth, and these second frequency ranges are numbered. The frequency range indication information carried by the first indication information is used to indicate the number of one or more second frequency ranges, thereby obtaining one or more first frequency ranges. In some embodiments, the second frequency range indicated by the first indication information is the first frequency range for which system information exists.

[0315] In some embodiments, the frequency range indication information is also used to indicate one or more frequency positions in the first frequency range. The one or more frequency positions are frequency positions where system information exists or frequency positions where system information does not exist, which may depend on the number of bits used by the first indication information carried by the first information. In some embodiments, the bits contained in the first indication information are used to indicate the number of the above-mentioned second frequency range, and the number of the frequency position within the indicated second frequency range. In this case, it is only necessary to search for the first information at a small number of preset frequency positions in the system frequency band to accurately indicate a large number of frequency domain positions where system information exists or does not exist. For example, a preset frequency position is preset for searching for the first information, which can further reduce the range of the terminal's search for system information.

[0316] In some embodiments, the first information carries second indication information, and the second indication information is used to indicate the time domain position of the system information.

[0317] In some embodiments, the second indication information is used to indicate a time domain offset between a time domain location of the first information and a first time domain unit; wherein the first time domain unit is the time domain unit where the system information is located. In some embodiments, the time domain offset is indicated by a bit carried by the second indication information.

[0318] In some embodiments, the system information belongs to a system information set, i.e., the system information is a set of system information. In this case, the second indication information is used to indicate the time domain offset between the time domain location of the first information and the time domain unit in which the system information set is located. In some embodiments, the system information includes an SSB, and the system information set includes an SSB set.

[0319] In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is predefined. In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is indicated by the information carried by the first information. The granularity of the time domain unit of the first information includes at least one of a radio frame, a half frame, a subframe, and a time domain symbol. The terminal obtains time synchronization with the network based on the searched first information, and then determines the first time domain unit in which the system information is located in combination with the above-mentioned time domain offset indicated by the second indication information. In some embodiments, in the case of periodic transmission of system information, the above-mentioned time domain offset can be defined as the time domain offset between the first information and the system information closest to the time domain unit in which the first information is located.

[0320] In some embodiments, the timing relationship between the time domain position of the system information and the starting position of the first time domain unit is predefined or preconfigured.

[0321] In some embodiments, the first time domain unit includes at least one of the following:

[0322] Wireless frames;

[0323] half frame;

[0324] subframe;

[0325] Time domain symbols.

[0326] In some embodiments, the second indication information is used to indicate a period of the system information. The terminal searches for system information based on the period of the system information to implement cell search. In some embodiments, the period of the system information is indicated by a bit carried in the second indication information.

[0327] In some embodiments, the second indication information is used to indicate the first time domain unit where the system information is located. That is, the position of the first time domain unit is directly indicated by the second indication information. In some embodiments, the position of the first time domain unit is indicated by a bit carried by the second indication information. For the specific description of the first time domain unit, reference may be made to the foregoing content, and the embodiments of the present application will not be repeated here. For example, in the NR system, the SSB is located within the time range of half a frame of the radio frame, which may be the first half frame or the second half frame, and the second indication information can directly indicate the half frame where the SSB is located.

[0328] In some embodiments, the first information carries third indication information, where the third indication information is used to indicate the number of system information included in the system information set. In some embodiments, the third indication information is also used to indicate the position of the system information actually sent in the system information set in the system information set.

[0329] In some embodiments, the system information is an SSB, the system information set is an SS / PBCH burst set, and the system information set is used to implement multi-beam transmission of the system information, that is, each system information corresponds to a beam.

[0330] In some embodiments, the first information carries fourth indication information, the fourth indication information being used to indicate communication parameters corresponding to the system information, the communication parameters corresponding to the system information being used to reflect relevant parameters used to transmit the system information. In some embodiments, the communication parameters include subcarrier spacing.

[0331] FIG13 is a block diagram of a cell search device provided by an exemplary embodiment of the present application, which can be implemented as a network device or as a part of a network device through software or hardware or a combination of both.

[0332] The sending module 1301 is configured to send first information at a preset frequency position, where the first information is used to indicate a search range for system information; wherein the system information is used for cell search.

[0333] In some embodiments, the device sends the first information at a preset frequency position by broadcasting.

[0334] The first information is used to indicate a search range for system information, which can also be equivalently understood as either the first information being used to narrow the search range for system information or the first information being used to locate the search range for system information. The search range for system information includes at least one of the position of the system information in the frequency domain and the position in the time domain, i.e., the first information is used to instruct the terminal to obtain system information. The preset frequency position is a preset frequency position for searching for the first information. In some embodiments, the information indicating the preset frequency position is set in the terminal or in the SIM card of the terminal.

[0335] In some embodiments, when the first information is used to narrow the search range of system information, the search range of the system information before narrowing is defined by a preset first frequency position for searching the system information. In some embodiments, the first frequency position refers to the frequency position of the synchronization grid. That is, the indication of the first information can narrow the search range of the system information indicated by the synchronization grid. For example, the search range of the system information indicated by the first information may be smaller than the search range of the system information indicated by the first frequency position, or the first information can indicate the degree of narrowing or the method of narrowing the search range of the system information indicated by the first frequency position.

[0336] For the specific content of the first information being used to narrow the search scope of system information, the first information being used to locate the search scope of system information, and the first information being used to indicate the search scope of system information, please refer to the description below, and the embodiments of the present application will not be described here.

[0337] The above-mentioned system information is used for cell search. In some embodiments, the system information includes at least one of PBCH, SS, PSS, SSS, and SSB, and the SSB includes at least one of a cell-defined SSB and a non-cell-defined SSB. In some embodiments, the first information is different from the system information. In some embodiments, the system information may also be referred to as broadcast information, cell search information, system signal, broadcast signal, cell search signal, etc. The embodiments of the present application do not limit the specific name of the system information.

[0338] In some embodiments, the first information is used to indicate at least one of the following information:

[0339] Frequency domain location of system information;

[0340] The temporal location of system information;

[0341] The number of system information included in the system information set;

[0342] Communication parameters corresponding to system information.

[0343] The system information set is a set of system information. In some embodiments, the system information is an SSB, and the system information set is an SS / PBCH burst set. The system information set is used to implement multi-beam transmission of the system information, i.e., each piece of system information corresponds to a beam. The communication parameters corresponding to the system information are used to reflect the relevant parameters used to transmit the system information, such as the subcarrier spacing corresponding to the system information.

[0344] In some embodiments, the first information is a first signal. In some embodiments, the first signal includes at least one of the following:

[0345] Synchronization signal;

[0346] Reference signal.

[0347] In some embodiments, the synchronization signal includes at least one of a PSS and an SSS. The reference signal includes at least one of a TRS and a DMRS. It should be noted that the type of the first signal described above is merely an example, and the first signal can also be other types of signals, such as signals other than the synchronization signal and reference signal described above, and this is not limited in the embodiments of the present application.

[0348] In some embodiments, the format of the first signal is a sequence. For example, the first signal uses a ZC sequence or an m sequence. In some embodiments, the first signal and the synchronization signal used for cell search use different sequences.

[0349] In some embodiments, the sequence used by the first signal is related to indication information carried by the first signal, where the indication information includes at least one of first indication information, second indication information, third indication information, and fourth indication information. The first indication information is used to indicate the frequency domain location of the system information, the second indication information is used to indicate the time domain location of the system information, the third indication information is used to indicate the number of system information included in the system information set, and the fourth indication information is used to indicate the communication parameters corresponding to the system information.

[0350] In some embodiments, the first information is a first channel. In some embodiments, the first channel includes at least one of the following:

[0351] PBCH;

[0352] PDCCH;

[0353] Index channel;

[0354] Search channel.

[0355] In some embodiments, when the first channel is a PBCH, the format of the first channel and the PBCH in the SSB used for cell search may be the same or different. When the first channel is a PDCCH, the format of the first channel and the PDCCH mainly used to carry control information in the related art may be the same or different. The first channel carries the indication information carried by the above-mentioned first information through the bits carried in the channel. It should be noted that the type of the above-mentioned first channel is only used as an example, and the first channel can also be other types of channels, for example, channels other than the channels described in the above examples, such as other channels that carry broadcast, control, system and other information, and the embodiments of the present application do not limit this.

[0356] The preset frequency position is located in the system frequency band, and there are one or more preset frequency positions in the system frequency band. In some embodiments, the system frequency band is a frequency band supported by the mobile communication system or network device currently accessible to the terminal, or a frequency band supported by the terminal's current operator. The frequency band supported by the operator can be indicated by information carried in the SIM card.

[0357] In some embodiments, the preset frequency positions occur at intervals, and the frequency domain intervals between adjacent preset frequency positions are the same. In some embodiments, the frequency domain intervals are predefined. In some embodiments, the frequency domain intervals are preconfigured, for example, via information carried in a SIM card.

[0358] In some embodiments, the preset frequency positions are spaced apart, and at least two adjacent sets of the preset frequency positions have different frequency domain intervals. That is, for multiple sets of adjacent preset frequency positions, the frequency domain intervals corresponding thereto may be completely different or partially the same. In some embodiments, the frequency domain interval is predefined. In some embodiments, the frequency domain interval is preconfigured, for example, via information carried in a SIM card.

[0359] In some embodiments, there is a preset frequency position in the system frequency band.

[0360] In some embodiments, the preset frequency position includes a portion of a plurality of first frequency positions; wherein the first frequency position is a preset frequency position for searching for the system information. In some embodiments, the first frequency position is associated with the frequency position of the system information. That is, when the first frequency position is searched, the frequency position of the system information can be obtained.

[0361] In some embodiments, the first frequency position includes a frequency position of a synchronization grid, and the first frequency position can be regarded as a synchronization grid. It should be noted that the embodiments of the present application do not limit the specific name of the first frequency position.

[0362] A portion of the synchronization grids is preset in the entire synchronization grid for the terminal to search for the first information. The preset portion of the synchronization grid has a sparser distribution than the entire synchronization grid. Since the preset portion of the synchronization grid is smaller than the entire synchronization grid, the terminal search delay and power consumption can be greatly reduced, depending on the interval between the synchronization grids.

[0363] In some embodiments, the preset frequency position includes a frequency position other than a first frequency position; wherein the first frequency position is a frequency position preset for searching for the system information. In some embodiments, the first frequency position includes a frequency position of a synchronization grid. That is, a frequency position is set outside the synchronization grid for the terminal to search for the first information. In some embodiments, the preset frequency position in this case is indicated by an ARFCN.

[0364] In some embodiments, the first information carries first indication information, and the first indication information is used to indicate the frequency domain position of the system information.

[0365] In some embodiments, the first indication information is used to indicate that the system information exists in one or more first frequency ranges, or that the system information does not exist in the one or more first frequency ranges.

[0366] In some embodiments, the first frequency range is associated with the preset frequency position. In this case, the first indication information may not need to carry information indicating the first frequency range, but only carry system information indication information, where the system information indication information is used to indicate whether system information exists in the first frequency range. The terminal can determine the first frequency range based on the preset frequency position of the first information currently searched, and can determine whether system information exists in the first frequency range corresponding to the preset frequency position of the first information currently searched in combination with the system information indication information.

[0367] In some embodiments, the first frequency range is a frequency range centered on the preset frequency position, and the size of the first frequency range is related to a first frequency domain interval; wherein the first frequency domain interval is a frequency domain interval between the preset frequency position and an adjacent frequency position, and the adjacent frequency position is a preset frequency position adjacent to the preset frequency position. In some embodiments, the first indication information carries 1 bit of system information indication information, thereby indicating whether system information exists within the first frequency range determined according to the preset frequency position.

[0368] In some embodiments, the first indication information includes frequency range indication information; wherein the frequency range indication information is used to indicate the one or more first frequency ranges. In some embodiments, the first indication information also includes system information indication information, wherein the system information indication information is used to indicate whether system information exists for each of the one or more first frequency ranges. In some embodiments, the first frequency range indicated by the frequency range indication information is a frequency range for which system information exists.

[0369] In some embodiments, the frequency range indication information and the system information indication information are implemented as a single message. In some embodiments, the frequency range indication information and the system information indication information are provided separately. The first indication information carries a certain number of bits, thereby carrying the frequency range indication information and the system information indication information. The number of bits is determined based on the content of the frequency range indication information and the system information indication information.

[0370] In some embodiments, the frequency range indication information is used to indicate the one or more first frequency ranges within a plurality of second frequency ranges; wherein the second frequency range is a predefined frequency range or a preconfigured frequency range. In some embodiments, multiple second frequency ranges are set within a system frequency band according to a predefined bandwidth, and these second frequency ranges are numbered. The frequency range indication information carried by the first indication information is used to indicate the number of one or more second frequency ranges, thereby obtaining one or more first frequency ranges. In some embodiments, the second frequency range indicated by the first indication information is the first frequency range for which system information exists.

[0371] In some embodiments, the frequency range indication information is also used to indicate one or more frequency positions in the first frequency range. The one or more frequency positions are frequency positions where system information exists or frequency positions where system information does not exist, which may depend on the number of bits used by the first indication information carried by the first information. In some embodiments, the bits contained in the first indication information are used to indicate the number of the above-mentioned second frequency range, and the number of the frequency position within the indicated second frequency range. In this case, it is only necessary to search for the first information at a small number of preset frequency positions in the system frequency band to accurately indicate a large number of frequency domain positions where system information exists or does not exist. For example, a preset frequency position is preset for searching for the first information, which can further reduce the range of the terminal's search for system information.

[0372] In some embodiments, the first information carries second indication information, and the second indication information is used to indicate the time domain position of the system information.

[0373] In some embodiments, the second indication information is used to indicate a time domain offset between a time domain location of the first information and a first time domain unit; wherein the first time domain unit is the time domain unit where the system information is located. In some embodiments, the time domain offset is indicated by a bit carried by the second indication information.

[0374] In some embodiments, the system information belongs to a system information set, i.e., the system information is a set of system information. In this case, the second indication information is used to indicate the time domain offset between the time domain location of the first information and the time domain unit in which the system information set is located. In some embodiments, the system information includes an SSB, and the system information set includes an SSB set.

[0375] In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is predefined. In some embodiments, the timing relationship between the time domain position of the first information and the starting position of the time domain unit in which it is located is indicated by the information carried by the first information. The granularity of the time domain unit of the first information includes at least one of a radio frame, a half frame, a subframe, and a time domain symbol. The terminal obtains time synchronization with the network based on the searched first information, and then determines the first time domain unit in which the system information is located in combination with the above-mentioned time domain offset indicated by the second indication information. In some embodiments, in the case of periodic transmission of system information, the above-mentioned time domain offset can be defined as the time domain offset between the first information and the system information closest to the time domain unit in which the first information is located.

[0376] In some embodiments, the timing relationship between the time domain position of the system information and the starting position of the first time domain unit is predefined or preconfigured.

[0377] In some embodiments, the first time domain unit includes at least one of the following:

[0378] Wireless frames;

[0379] half frame;

[0380] subframe;

[0381] Time domain symbols.

[0382] In some embodiments, the second indication information is used to indicate a period of the system information. The terminal searches for system information based on the period of the system information to implement cell search. In some embodiments, the period of the system information is indicated by a bit carried in the second indication information.

[0383] In some embodiments, the second indication information is used to indicate the first time domain unit where the system information is located. That is, the position of the first time domain unit is directly indicated by the second indication information. In some embodiments, the position of the first time domain unit is indicated by a bit carried by the second indication information. For the specific description of the first time domain unit, reference may be made to the foregoing content, and the embodiments of the present application will not be repeated here. For example, in the NR system, the SSB is located within the time range of half a frame of the radio frame, which may be the first half frame or the second half frame, and the second indication information can directly indicate the half frame where the SSB is located.

[0384] In some embodiments, the first information carries third indication information, where the third indication information is used to indicate the number of system information included in the system information set. In some embodiments, the third indication information is also used to indicate the position of the system information actually sent in the system information set in the system information set.

[0385] In some embodiments, the system information is an SSB, the system information set is an SS / PBCH burst set, and the system information set is used to implement multi-beam transmission of the system information, that is, each system information corresponds to a beam.

[0386] In some embodiments, the first information carries fourth indication information, the fourth indication information being used to indicate communication parameters corresponding to the system information, the communication parameters corresponding to the system information being used to reflect relevant parameters used to transmit the system information. In some embodiments, the communication parameters include subcarrier spacing.

[0387] It should be noted that when the device provided in the above embodiment realizes its function, it only uses the division of the above-mentioned functional modules as an example. In actual application, the above-mentioned functions can be distributed and completed by different functional modules according to actual needs, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0388] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0389] FIG14 is a schematic structural diagram of a communication device (terminal / network device) provided by an exemplary embodiment of the present application. The communication device 1400 includes: a processor 1401 , a receiver 1402 , a transmitter 1403 , a memory 1404 and a bus 1405 .

[0390] The processor 1401 includes one or more processing cores. The processor 1401 executes various functional applications and information processing by running software programs and modules.

[0391] The receiver 1402 and the transmitter 1403 may be implemented as a communication component, which may be a communication chip.

[0392] The memory 1404 is connected to the processor 1401 via a bus 1405. The memory 1404 may be used to store at least one instruction, and the processor 1401 may be used to execute the at least one instruction to implement each step in the above method embodiment.

[0393] In addition, the memory 1404 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Volatile or non-volatile storage devices include but are not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static random-access memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, and programmable read-only memory (PROM).

[0394] When the communication device is implemented as a terminal, the processor and transceiver in the communication device involved in the embodiments of the present application can be implemented together as a communication chip, or the transceiver can form a communication chip alone. The transmitter in the transceiver performs the sending step performed by the terminal in any of the above-mentioned methods, the receiver in the transceiver performs the receiving step performed by the terminal in any of the above-mentioned methods, and the processor performs steps other than the sending and receiving steps, which are not further described here.

[0395] When the communication device is implemented as a network device, the processor and transceiver in the communication device involved in the embodiments of the present application can be implemented together as a communication chip, or the transceiver can form a communication chip alone. The transmitter in the transceiver performs the sending step performed by the network device in any of the above-mentioned methods, the receiver in the transceiver performs the receiving step performed by the network device in any of the above-mentioned methods, and the processor performs steps other than the sending and receiving steps, which are not further described here.

[0396] In an exemplary embodiment, a computer-readable storage medium is also provided, in which at least one instruction, at least one program, code set or instruction set is stored. The at least one instruction, the at least one program, the code set or instruction set is loaded and executed by a processor to implement the cell search method provided by the above-mentioned various method embodiments.

[0397] In an exemplary embodiment, a chip is also provided, which includes a programmable logic circuit and / or program instructions. When the chip runs on a communication device, it is used to implement the cell search method provided by the above-mentioned various method embodiments based on the programmable logic circuit and / or program.

[0398] In an exemplary embodiment, a computer program product is further provided. When the computer program product is executed on a processor of a computer device, the computer device is enabled to perform the above cell search method.

[0399] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0400] The above description is merely an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A cell search method, characterized in that: The method is executed by a terminal, and includes: Searching for first information at a preset frequency position, where the first information is used to indicate a search range for system information; The system information is used for cell search.

2. The method according to claim 1, characterized in that The preset frequency positions appear at intervals, and the frequency domain intervals between adjacent preset frequency positions are the same.

3. The method according to claim 1, characterized in that The preset frequency positions appear at intervals, and there are at least two adjacent groups of the preset frequency positions with different frequency domain intervals.

4. The method according to any one of claims 1 to 3, characterized in that: The preset frequency position includes a part of the plurality of first frequency positions; The first frequency position is a preset frequency position for searching the system information.

5. The method according to any one of claims 1 to 3, characterized in that: The preset frequency position includes a frequency position other than the first frequency position; The first frequency position is a preset frequency position for searching the system information.

6. The method according to any one of claims 1 to 5, characterized in that: The first information carries first indication information, where the first indication information is used to indicate a frequency domain position of the system information.

7. The method according to claim 6, characterized in that The first indication information is used to indicate that the system information exists in one or more first frequency ranges, or that the system information does not exist in the one or more first frequency ranges.

8. The method according to claim 7, characterized in that The first frequency range is associated with the preset frequency position.

9. The method according to claim 8, characterized in that The first frequency range is a frequency range centered at the preset frequency position, and a size of the first frequency range is related to a first frequency domain interval; The first frequency domain interval is a frequency domain interval between the preset frequency position and an adjacent frequency position, and the adjacent frequency position is a preset frequency position adjacent to the preset frequency position.

10. The method according to claim 7, characterized in that The first indication information includes frequency range indication information; The frequency range indication information is used to indicate the one or more first frequency ranges.

11. The method according to claim 10, characterized in that The frequency range indication information is used to indicate the one or more first frequency ranges in a plurality of second frequency ranges; The second frequency range is a predefined frequency range or a preconfigured frequency range.

12. The method according to claim 11, characterized in that The frequency range indication information is further used to indicate one or more frequency positions in the first frequency range.

13. The method according to any one of claims 1 to 12, characterized in that: The first information carries second indication information, and the second indication information is used to indicate the time domain position of the system information.

14. The method according to claim 13, characterized in that The second indication information is used to indicate a time domain offset between a time domain position of the first information and a first time domain unit; The first time domain unit is the time domain unit where the system information is located.

15. The method according to claim 14, characterized in that The timing relationship between the time domain position of the system information and the starting position of the first time domain unit is predefined or preconfigured.

16. The method according to claim 14, characterized in that The first time domain unit includes at least one of the following: Wireless frames; Half frame; subframe; Time domain symbols.

17. The method according to claim 13, characterized in that The second indication information is used to indicate a period of the system information.

18. The method according to claim 13, characterized in that The second indication information is used to indicate the first time domain unit where the system information is located.

19. The method according to any one of claims 1 to 18, characterized in that: The first information carries third indication information, and the third indication information is used to indicate the number of the system information included in the system information set.

20. The method according to claim 19, characterized in that The third indication information is further used to indicate the position of the system information actually sent in the system information set in the system information set.

21. The method according to any one of claims 1 to 20, characterized in that: The first information carries fourth indication information, and the fourth indication information is used to indicate a communication parameter corresponding to the system information.

22. The method according to claim 21, characterized in that The communication parameters include subcarrier spacing.

23. The method according to any one of claims 1 to 22, characterized in that: The first information is a first signal.

24. The method according to claim 23, characterized in that The sequence used by the first signal is related to indication information carried by the first signal, where the indication information includes at least one of first indication information, second indication information, third indication information, and fourth indication information; Among them, the first indication information is used to indicate the frequency domain position of the system information, the second indication information is used to indicate the time domain position of the system information, the third indication information is used to indicate the number of system information included in the system information set, and the fourth indication information is used to indicate the communication parameters corresponding to the system information.

25. The method according to claim 23, characterized in that The first signal includes at least one of the following: Synchronous signal; Reference signal.

26. The method according to any one of claims 1 to 25, characterized in that: The first information is a first channel.

27. The method according to claim 26, characterized in that The first channel includes at least one of the following: Physical broadcast channel PBCH; Physical downlink control channel PDCCH; Index channel; Search for channels.

28. A cell search method, characterized in that: The method is performed by a network device, and the method includes: Sending first information at a preset frequency position, where the first information is used to indicate a search range for system information; The system information is used for cell search.

29. The method according to claim 28, characterized in that The preset frequency positions appear at intervals, and the frequency domain intervals between adjacent preset frequency positions are the same.

30. The method according to claim 28, characterized in that The preset frequency positions appear at intervals, and there are at least two adjacent groups of the preset frequency positions with different frequency domain intervals.

31. The method according to any one of claims 28 to 30, characterized in that: The preset frequency position includes a part of the plurality of first frequency positions; The first frequency position is a preset frequency position for searching the system information.

32. The method according to any one of claims 28 to 30, characterized in that The preset frequency position includes a frequency position other than the first frequency position; The first frequency position is a preset frequency position for searching the system information.

33. The method according to any one of claims 28 to 32, characterized in that: The first information carries first indication information, where the first indication information is used to indicate a frequency domain position of the system information.

34. The method according to claim 33, characterized in that The first indication information is used to indicate that the system information exists in one or more first frequency ranges, or that the system information does not exist in the one or more first frequency ranges.

35. The method according to claim 34, characterized in that The first frequency range is associated with the preset frequency position.

36. The method according to claim 35, characterized in that The first frequency range is a frequency range centered at the preset frequency position, and a size of the first frequency range is related to a first frequency domain interval; The first frequency domain interval is a frequency domain interval between the preset frequency position and an adjacent frequency position, and the adjacent frequency position is a preset frequency position adjacent to the preset frequency position.

37. The method according to claim 34, characterized in that The first indication information includes frequency range indication information; The frequency range indication information is used to indicate the one or more first frequency ranges.

38. The method according to claim 37, characterized in that The frequency range indication information is used to indicate the one or more first frequency ranges in a plurality of second frequency ranges; The second frequency range is a predefined frequency range or a preconfigured frequency range.

39. The method according to claim 38, characterized in that The frequency range indication information is further used to indicate one or more frequency positions in the first frequency range.

40. The method according to any one of claims 28 to 39, characterized in that: The first information carries second indication information, and the second indication information is used to indicate the time domain position of the system information.

41. The method according to claim 40, characterized in that The second indication information is used to indicate a time domain offset between a time domain position of the first information and a first time domain unit; The first time domain unit is the time domain unit where the system information is located.

42. The method according to claim 41, characterized in that The timing relationship between the time domain position of the system information and the starting position of the first time domain unit is predefined or preconfigured.

43. The method according to claim 41, characterized in that The first time domain unit includes at least one of the following: Wireless frames; Half frame; subframe; Time domain symbols.

44. The method according to claim 40, characterized in that The second indication information is used to indicate a period of the system information.

45. The method according to claim 40, characterized in that The second indication information is used to indicate the first time domain unit where the system information is located.

46. ​​The method according to any one of claims 28 to 45, characterized in that The first information carries third indication information, and the third indication information is used to indicate the number of the system information included in the system information set.

47. The method according to claim 46, characterized in that The third indication information is further used to indicate the position of the system information actually sent in the system information set in the system information set.

48. The method according to any one of claims 28 to 47, characterized in that The first information carries fourth indication information, and the fourth indication information is used to indicate a communication parameter corresponding to the system information.

49. The method according to claim 48, characterized in that The communication parameters include subcarrier spacing.

50. The method according to any one of claims 28 to 49, characterized in that The first information is a first signal.

51. The method according to claim 50, characterized in that The sequence used by the first signal is related to indication information carried by the first signal, where the indication information includes at least one of first indication information, second indication information, third indication information, and fourth indication information; Among them, the first indication information is used to indicate the frequency domain position of the system information, the second indication information is used to indicate the time domain position of the system information, the third indication information is used to indicate the number of system information included in the system information set, and the fourth indication information is used to indicate the communication parameters corresponding to the system information.

52. The method according to claim 50, characterized in that The first signal includes at least one of the following: Synchronous signal; Reference signal.

53. The method according to any one of claims 28 to 52, characterized in that The first information is a first channel.

54. The method according to claim 53, characterized in that The first channel includes at least one of the following: PBCH; PDCCH; Index channel; Search for channels.

55. A cell search device, characterized in that: The device comprises: A receiving module, configured to search for first information at a preset frequency position, wherein the first information is used to indicate a search range of system information; The system information is used for cell search.

56. A cell search device, characterized in that The device comprises: A sending module, used to send first information at a preset frequency position, where the first information is used to indicate a search range for system information; The system information is used for cell search.

57. A terminal, characterized in that: The terminal comprises: processor; a transceiver connected to the processor; a memory for storing executable instructions for the processor; The terminal is configured to load the executable instructions so that the terminal implements the cell search method as described in any one of claims 1 to 27.

58. A network device, characterized in that: The network equipment includes: processor; a transceiver connected to the processor; a memory for storing executable instructions for the processor; The network device is configured to load the executable instructions so that the network device implements the cell search method as described in any one of claims 28 to 54.

59. A computer-readable storage medium, characterized in that The computer-readable storage medium stores executable instructions, and the executable instructions are loaded and executed by a processor to implement the cell search method as described in any one of claims 1 to 54.

60. A chip, characterized in that: The chip includes a programmable logic circuit or a program, and the chip is used to implement the cell search method as described in any one of claims 1 to 54 based on the programmable logic circuit or the program.

61. A computer program product, characterized in that The computer program product includes computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the cell search method as described in any one of claims 1 to 54.

Images