CN116980927A

CN116980927A - Cell searching method and device and computer readable storage medium

Info

Publication number: CN116980927A
Application number: CN202210454834.4A
Authority: CN
Inventors: 赵思聪
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2023-10-31

Abstract

A cell search method and apparatus, a computer readable storage medium, the method comprising: acquiring a first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of a first terminal; when the current frequency point of the first SSB is not in accordance with the first terminal access requirement, determining the frequency point in accordance with the first terminal access requirement according to the first indication information. When the terminal searches the cell, the searching frequency point indication of the terminal can be optimized through the scheme of the invention, which is beneficial to reducing the energy consumption and the cell searching time delay of the terminal for searching the cell.

Description

Cell searching method and device and computer readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a cell search method and apparatus, and a computer readable storage medium.

Background

In the cell searching process at present, a terminal searches/blindly detects a synchronization signal according to a pre-configured synchronization grid, and acquires configuration information of a control-resource set (CORESET) of scheduling system information according to broadcast information in a synchronization signal block (Synchronization Signal Block, SSB) after searching the synchronization signal.

For terminals with specific access requirements, such terminals can only access cells that meet their access requirements. The criterion for determining whether the cell meets the access requirement of the specific terminal may be, for example, that the synchronization signal block and the control resource set sent by the cell meet the specific terminal capability.

However, the base station does not place synchronization signal blocks and control resource sets that satisfy the capabilities of a particular terminal on all synchronization grids. If the terminal is only relied on for blind search to find, the terminal energy consumption is wasted, and the cell search time delay is increased.

Disclosure of Invention

The technical problem solved by the invention is how to reduce the energy consumption and the time delay of searching the cell by the terminal.

In order to solve the above technical problems, an embodiment of the present invention provides a cell search method, including: acquiring a first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of a first terminal; when the current frequency point of the first SSB is not in accordance with the first terminal access requirement, determining the frequency point in accordance with the first terminal access requirement according to the first indication information.

Optionally, the first SSB further includes second indication information, where the second indication information is used to indicate frequency point information of a frequency point sending the second SSB, the first indication information includes third indication information, and the third indication information is used to indicate whether the frequency point sending the second SSB meets the access requirement of the first terminal.

Optionally, the step of sending the current frequency point of the first SSB does not meet the access requirement of the first terminal means that: the first SSB defines an SSB for a non-cell, and determining, according to the first indication information, a frequency point meeting the access requirement of the first terminal includes: when the third indication information indicates that the frequency point of the second SSB meets the access requirement of the first terminal, determining the frequency point of the second SSB indicated by the second indication information as the frequency point meeting the access requirement of the first terminal; when the third indication information indicates that the frequency point of the second SSB is not in accordance with the access requirement of the first terminal, the frequency point of the second SSB indicated by the second indication information is determined to be the frequency point not in accordance with the access requirement of the first terminal.

Optionally, the first indication information includes fourth indication information, where the fourth indication information is used to indicate frequency point information of a frequency point that meets or does not meet the access requirement of the first terminal.

Optionally, the fourth indication information includes an invalid code point and at least one valid code point, where the at least one valid code point corresponds to frequency point information of at least one frequency point one by one, and for each valid code point, the valid code point is used to indicate that the corresponding frequency point meets the first terminal access requirement, and the invalid code point is used to indicate that the at least one frequency point does not meet the first terminal access requirement.

Optionally, the step of sending the current frequency point of the first SSB does not meet the access requirement of the first terminal means that: the first SSB defines an SSB for a cell, and the common control resource set associated with the first SSB does not meet a preset terminal capability, and determining, according to the first indication information, a frequency point meeting an access requirement of the first terminal includes: when the fourth indication information comprises the effective code point, determining that the frequency point corresponding to the effective code point is or contains the frequency point meeting the access requirement of the first terminal; and when the fourth indication information comprises the invalid code point, determining that the frequency point corresponding to the valid code point is not or does not contain the frequency point meeting the access requirement of the first terminal.

Optionally, the first indication information is carried by a main information block and/or layer 1 load of the first SSB.

Optionally, the first indication information includes an offset value, and the sending that the current frequency point of the first SSB does not meet the first terminal access requirement means that: the first SSB defines an SSB for a non-cell, and determining, according to the first indication information, a frequency point meeting the access requirement of the first terminal includes: searching a preset comparison table, and determining frequency point information corresponding to the offset value indicated by the first indication information, wherein the preset comparison table comprises a plurality of offset values, frequency point information of a plurality of frequency points and association relations between the plurality of offset values and the plurality of frequency point information, and the plurality of frequency points are frequency points meeting or not meeting the access requirement of the first terminal; and determining a frequency point meeting the access requirement of the first terminal according to the frequency point information obtained by searching, or determining the frequency point obtained by searching as a frequency point which does not meet the access requirement of the first terminal when cell searching is carried out.

Optionally, the frequency point meeting the access requirement of the first terminal at least meets the following conditions: and the SSB sent by the frequency point and the common control resource set associated with the SSB meet the preset terminal capability.

Optionally, the preset terminal capability at least includes: the subcarrier spacing of the SSB is a first threshold, and the subcarrier spacing of the SSB-associated common control resource set is a second threshold.

Optionally, the first threshold and the second threshold are both 15 khz.

Optionally, the first terminal is a low-capability terminal, and the first terminal access requirement at least includes: a maximum of 5 mhz is supported.

Optionally, the frequency point information includes: global synchronization channel number.

In order to solve the above technical problem, the embodiment of the present invention further provides a cell searching method, including: and broadcasting a first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal.

Optionally, the first SSB defines an SSB for a non-cell, and the first SSB further includes second indication information, where the second indication information is used to indicate frequency point information of a frequency point for sending the second SSB, and the first indication information includes third indication information, where the third indication information is used to indicate whether the frequency point for sending the second SSB meets the access requirement of the first terminal.

Optionally, the first SSB defines an SSB for a cell, and the common control resource set associated with the first SSB does not satisfy a preset terminal capability; the first indication information comprises fourth indication information, and the fourth indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal.

Optionally, the first indication information includes an offset value selected from a preset reference table, where the preset reference table includes a plurality of offset values and frequency point information of a plurality of frequency points, and an association relationship between the plurality of offset values and the plurality of frequency point information, and the plurality of frequency points are frequency points that meet or do not meet the access requirement of the first terminal.

Optionally, the cell meeting the access requirement of the first terminal at least meets the following conditions: and the SSB sent by the frequency point and the common control resource set associated with the SSB meet the preset terminal capability.

Optionally, the first threshold and the second threshold are both 15 khz.

In order to solve the above technical problem, an embodiment of the present invention further provides a cell search apparatus, including: the acquisition module is used for acquiring a first synchronous signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal; and the determining module is used for determining the frequency point meeting the access requirement of the first terminal according to the first indication information when the current frequency point of the first SSB is not met the access requirement of the first terminal.

In order to solve the above technical problem, an embodiment of the present invention further provides a cell search apparatus, including: and the broadcasting module is used for broadcasting the first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal.

To solve the above technical problem, embodiments of the present invention further provide a computer readable storage medium, where the computer readable storage medium is a non-volatile storage medium or a non-transitory storage medium, and a computer program is stored thereon, and when the computer program is executed by a processor, the steps of the above method are performed.

In order to solve the above technical problem, an embodiment of the present invention further provides a cell search apparatus, which includes a memory and a processor, where the memory stores a computer program that can be run on the processor, and the processor executes the steps of the above method when running the computer program.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

on the terminal side, the embodiment of the invention provides a cell searching method, which comprises the following steps: acquiring a first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of a first terminal; when the current frequency point of the first SSB is not in accordance with the first terminal access requirement, determining the frequency point in accordance with the first terminal access requirement according to the first indication information.

Compared with the prior art that a terminal with specific access requirements can only search cells meeting the terminal capability of the terminal through blind search, the method and the device greatly reduce the energy consumption and the cell search time delay of the terminal for searching the cells by optimizing the search frequency point indication of the terminal. Specifically, the terminal obtains additional frequency point information from the first SSB retrieved currently, where the additional frequency point information is used for the terminal to quickly determine a frequency point meeting the self-access requirement or quickly reject a frequency point not meeting the self-access requirement. Therefore, when the current frequency point for transmitting the first SSB does not meet the self access requirement, the terminal does not need to continuously perform blind detection on the SSB, and can search with certain directivity. For example, the terminal may directly search for a frequency point that meets its own access requirement, or the terminal may directly skip a frequency point that does not meet its own access requirement. This is advantageous in order to avoid wasting search time and terminal power consumption.

The embodiment of the invention also provides a cell searching method, which comprises the following steps: and broadcasting a first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal.

The base station can provide additional frequency point information for the terminal so as to guide the terminal to quickly determine the frequency points meeting the self-access requirement or quickly reject the frequency points not meeting the self-access requirement when searching the cell. Therefore, time and energy consumption of the terminal due to blind detection of the SSB are avoided.

Drawings

Fig. 1 is a flowchart of a cell search method according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a first exemplary application scenario of an embodiment of the present invention;

FIG. 3 is a schematic diagram of a second exemplary application scenario of an embodiment of the present invention;

FIG. 4 is a schematic diagram of a third exemplary application scenario according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a cell search apparatus according to a second embodiment of the present invention;

fig. 6 is a flowchart of a cell search method according to a third embodiment of the present invention;

fig. 7 is a schematic diagram of a cell search apparatus according to a fourth embodiment of the present invention.

Detailed Description

As mentioned in the background, since the base station does not place synchronization signal blocks and control resource sets that meet the capabilities of a particular terminal on all synchronization grids. A terminal with a particular access requirement may search for cells that do not meet its access requirement when searching for cells blindly based on prior art. When the searched cell is found not to meet the self access requirement, the terminal cannot access the cell. At this time, the terminal needs to continue blind search until finding a cell meeting the access requirement of the terminal. Because the terminal is required to be continuously in trial and error, the existing continuous blind search is carried out until a cell search scheme meeting the self access requirement is found, the cell search time delay of the terminal (particularly the terminal with the specific access requirement) can be greatly increased obviously, and the energy consumption of the terminal can be greatly wasted.

The terminal with specific access requirements may for example be a low capability (Reduced capability, redCap) terminal, i.e. a reduced capability terminal. Currently, mobile communication of The Fifth generation mobile communication technology (The Fifth-Generation mobile communications, abbreviated as 5G) protocol 17 (release 17, abbreviated as Rel.17) version has introduced a low capability terminal of 20 megahertz (MHz). The 20MHz bandwidth capability may enable the terminal to have a rate capability of 80Mbps (Mbps is a acronym for megabits per second, referring to the number of bits (bits) transmitted per second) that is still large and small for some applications at very low end, such as sensor networks requiring only a few Mbps. Therefore, it is possible for the standards organization to introduce lower-capability terminals of lower bandwidth capabilities in the next version, such as to reduce the bandwidth of the low-capability terminals to 5MHz.

Meanwhile, an important reference parameter in the 5G system is subcarrier spacing (SubCarrier Spacing, SCS for short), and the physical layer resource is divided under different subcarrier spacing. Currently 15 kilohertz (KHz), 30KHz and 60KHz are mainly applied for low frequencies. And for the initial access synchronous resource block and control resource set number 0 (CORESET # 0), the optional subcarrier spacing is 15KHz and 30KHz.

When introducing 5MHz bandwidth capability for low capability terminals, the supported subcarrier spacing needs to be considered. By analysis, some pre-configurations of current systems may enable access to such low capability terminals of 5MHz bandwidth while supporting only 15KHz subcarrier spacing. While a low capability terminal of 5MHz bandwidth has some problems in listening to both the synchronization resource block and the control resource set No. 0 if a subcarrier spacing of 30KHz is to be supported. For example, a synchronization signal block with a bandwidth of 7.2mhz and a low capability terminal with a bandwidth of 5mhz cannot completely receive the synchronization signal block. And, the minimum bandwidth of the control resource set No. 0 of the subcarrier interval of 30KHz is 8.6MHz, and the low-capability terminal with 5MHz bandwidth can not completely receive the control resource set No. 0. If a subcarrier spacing of up to 30KHz is to be supported, no minor modifications are required to the synchronization signal block and/or the control resource set number 0. From the system impact point of view. Or a sub-carrier spacing that supports only 15KHz is relatively acceptable.

When the terminal only supports the subcarrier interval of 15KHz, the synchronous signal block transmitted by the cell requiring access and the subcarrier interval of the control resource set 0 are both 15KHz and can be accessed, otherwise, the cell transmitting the synchronous signal block on the current synchronous grid is considered to be inaccessible.

The terminal judges whether the subcarrier spacing meets the requirement or not by the following mode:

1. firstly, blind detection of a synchronous signal block is performed on a synchronous grid at a specified subcarrier interval (such as 15 KHz), and after the synchronous signal block is successfully detected, the subcarrier interval of the synchronous signal block is confirmed to be available;

2. then, the control resource set of the scheduling system information, the configuration information of the search space, and the information of the cell common subcarrier interval are acquired by reading a physical broadcast channel (Physical Broadcast Channel, abbreviated as PBCH) in the synchronization signal block. The common subcarrier spacing here is also the subcarrier spacing of the control resource set No. 0.

3. If step 1 and step 2 determine that the subcarrier spacing of the synchronization signal block and the control resource set No. 0 meet the requirements (i.e., are both 15 KHz), then attempt to read the system information and access the cell that sends the SSB. If the step 1 or 2 judges that the subcarrier interval of any one of the synchronous signal block and the control resource set 0 is not 15KHz, the method jumps to other synchronous grids to continue searching until the cell meeting the access requirement is searched.

As described above, for a low capability terminal supporting only 5MHz bandwidth and only 15KHz subcarrier spacing, the synchronization signal block is first searched at 15KHz by desynchronizing the grid, and then it is determined whether the subcarrier spacing of the control resource set No. 0 is 15KHz according to the subcarrier spacing indication carried by the PBCH in the synchronization signal block. If the subcarrier interval of any one of the synchronization signal block and the number 0 control resource set is not 15KHz, the cell sending the synchronization signal block is considered to not meet the access requirement of the terminal, and the terminal needs to jump to other synchronization grids (also can be understood as frequency points) to blindly check the synchronization signal block again and determine the subcarrier interval of the number 0 control resource set. The synchronization grid corresponds to one frequency point, or may correspond to a frequency point range (also referred to as a frequency domain range or a frequency range), and one synchronization grid includes one or more frequency points.

Blind detection is electricity consuming and time consuming, and if a low-capability terminal supporting only 5MHz bandwidth and only 15KHz subcarrier spacing is left to perform cell search in a blind detection manner, the cell search delay of such terminals will be necessarily increased, and the electric power of such terminals will be greatly consumed.

The inventor of the application discovers through analysis that if a low-capacity terminal only supporting 5MHz bandwidth and only supporting 15KHz subcarrier spacing blindly detects a synchronous signal block with 15KHz subcarrier spacing, but the subcarrier spacing of a No. 0 control resource set associated with the synchronous signal block is not 15KHz, a currently searched cell can actively indicate that the subcarrier spacing of a synchronous signal block and a No. 0 control resource set is a frequency point with 15KHz for the terminal, and the terminal can directly search the frequency point with directivity. Or if the currently searched cell can actively indicate to the terminal which frequency intervals the synchronization signal block and the control resource set 0 in cannot meet the subcarrier spacing requirement of 15KHz at the same time, the terminal can intentionally skip the frequency intervals to search for the cell. The two modes can effectively avoid that a low-capacity terminal which only supports the bandwidth of 5MHz and only supports the subcarrier spacing of 15KHz searches cells which do not meet the access requirement of the terminal.

In the current protocol, because the base station may place a non-cell defining-SSB (NCD-SSB for short) on the synchronization grid for measurement purposes, the synchronization signal block is not associated with the control resource set No. 0, and cannot be used for cell access naturally. When the terminal searches for the NCD-SSB, such a synchronization signal block may indicate to the terminal which frequency point has a cell defining-SSB (CD-SSB for short) or which frequency range has no CD-SSB through a series of parameters carried. The CD-SSB is the synchronization signal block associated with control resource set No. 0. The series of parameters may be, for example: an offset value (Kssb) for determining a frequency offset between a synchronization signal block currently carrying the value and a control resource set No. 0; a CORESET #0 configuration field (control resource zero) for indicating configuration information of the control resource set No. 0; and a search space field (searchSpaceZero) for configuring a search space.

Specifically, the PBCH content may include a synchronization signal block and an inter-subcarrier offset (SSB-subcarrier-offset) field, i.e., the aforementioned offset value Kssb. The value is used to determine one of the parameters of the frequency offset between the synchronization signal block currently carrying the value and the control resource set number 0.

For example, the terminal determines the frequency domain location of the current synchronization signal block by reading the current synchronization signal block (the synchronization signal block is on a synchronization grid, and the subcarrier spacing and the number of subcarriers of the synchronization signal block are determined). Then reading a Kssb field (which is formed by a main information block (Master Information Block, abbreviated as MIB) and a layer 1 payload) carried by the PBCH in the current synchronization signal block, where the Kssb indicates an offset value between a lower boundary of the current synchronization signal block and a reference synchronization signal block (SSB-CRB), so as to determine a position of the SSB-CRB. The parameter offset (RB) in the control resource set number 0 (CORESET#0) configuration table is then used to indicate the offset values of SSB-CRB and CORESET#0. In this way, the terminal can determine the position of the control resource set No. 0, and then blindly test the physical downlink control channel (Physical Downlink Control Channel, abbreviated as PDCCH) therein, thereby obtaining the system information (system information).

Kssb has 5 bits in total in the frequency domain range 1 (FR 1), and can indicate 32 values, but is used for the indication of SSB-CRB only when the indicated value is less than 23. Kssb indicates information indicating cell search when it is greater than 23, including which frequency points have CD-SSB and which frequency ranges have no CD-SSB.

For example, when the indication of the offset value Kssb is a value of 24 to 30, it can be determined that Is located at the CD-SSB. Wherein (1)>For the frequency point where the current SSB is located, +.>Determined according to table 1. Table 1 records a plurality of lines of data, wherein one line of data comprises a value indicated by a certain offset value Kssb, a value range constructed by a control resource zero field and a searchSpaceZero field, and a corresponding value in the value range>Values. Reserved is a Reserved value.

TABLE 1

For another example, when the offset value kssb=31, it can be determined that There is no CD-SSB in this frequency range, wherein (1)>And->Indicated by the controllresourcesezezero field and the searchspaczero field, respectively.

The PBCH content may further include configuration information (PDCCH-ConfigSIB 1) for indicating control information of scheduling system information, which is 8 bits in total, wherein 4 bits (corresponding field controllably resourceseetzero) are used for configuration information indicating CORESET #0, and the remaining 4 bits (corresponding field searchSpaceZero) are used for configuration of a search space. When the offset value Kssb indicates more than 23, 8-bit translation of the control resource zero field and the searchSpaceZero field is used to indicate information of cell search, including which frequency points have CD-SSB and which frequency ranges have no CD-SSB.

However, this CD-SSB indication scheme in the existing protocols still fails to address the cell search problem for low capability terminals supporting only 5MHz bandwidth and only 15KHz subcarrier spacing. For such terminals, when cell search is performed as specified by the foregoing protocol, a synchronization signal block and/or control resource set number 0 with a subcarrier spacing other than 15KHz may still be searched.

On the terminal side, the embodiment greatly reduces the energy consumption and the cell search time delay of the terminal for searching the cell by optimizing the search frequency point indication of the terminal. Specifically, the terminal obtains additional frequency point information from the first SSB retrieved currently, where the additional frequency point information is used for the terminal to quickly determine a frequency point meeting the self-access requirement or quickly reject a frequency point not meeting the self-access requirement. Therefore, when the current frequency point for transmitting the first SSB does not meet the self access requirement, the terminal does not need to continuously perform blind detection on the SSB, and can search with certain directivity. For example, the terminal may directly search for a frequency point that meets its own access requirement, or the terminal may directly skip a frequency point that does not meet its own access requirement. This is advantageous in order to avoid wasting search time and terminal power consumption.

The method provided by the embodiment of the application relates to a base station and a terminal, wherein uplink communication or downlink communication can be performed between the base station and the terminal.

Terminal (terminal). The terminal according to the embodiment of the present application is a device having a wireless communication function, and may be referred to as a terminal device, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), an access terminal device, a vehicle-mounted terminal device, an industrial control terminal device, a UE unit, a UE station, a mobile station, a remote terminal device, a mobile device, a UE terminal device, a wireless communication device, a UE agent, or a UE apparatus. The terminal may be fixed or mobile. It should be noted that the terminal may support at least one wireless communication technology, such as LTE, new radio, NR, etc. For example, the terminal may be a mobile phone, tablet, desktop, notebook, all-in-one, in-vehicle, virtual Reality (VR) terminal device, augmented reality (augmented reality, AR) terminal device, wireless terminal in industrial control (industrial control), wireless terminal in unmanned (self-driving), wireless terminal in tele-surgery (remote medical surgery), wireless terminal in smart grid, wireless terminal in transportation security (transportation safety), wireless terminal in smart city, wireless terminal in smart home (PLMN) wireless terminal, cellular telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) telephone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, wearable device, terminal device in future mobile communication network or terminal in future public mobile network (public land mobile network) and so forth. In some embodiments of the present application, the terminal may also be a device with transceiving functions, such as a chip system. The chip system may include a chip and may also include other discrete devices.

A network device. In the embodiment of the application, the network device is a device for providing a wireless communication function for the terminal, and may also be called an access network device, a radio access network (radio access network, RAN) device, an access network element, or the like. Wherein the network device may support at least one wireless communication technology, e.g., LTE, NR, etc. By way of example, network devices include, but are not limited to: next generation base stations (gnbs), evolved node bs (enbs), radio network controllers (radio network controller, RNCs), node bs (node bs, NB), base station controllers (base station controller, BSC), base transceiver stations (base transceiver station, BTS), home base stations (e.g., home evolved node B, or home node B, HNB), baseband units (BBUs), transceiving points (transmitting and receiving point, TRPs), transmitting points (transmitting point, TP), mobile switching centers, and the like in a fifth generation mobile communication system (5 th-generation, 5G). The network device may also be a wireless controller, a Centralized Unit (CU), and/or a Distributed Unit (DU) in the cloud wireless access network (cloud radio access network, CRAN) scenario, or the access network device may be a relay station, an access point, an on-board device, a terminal device, a wearable device, and a network device in future mobile communication or a network device in a future evolved PLMN, etc. In some embodiments, the network device may also be an apparatus, such as a system-on-a-chip, having wireless communication functionality for the UE. By way of example, the chip system may include a chip, and may also include other discrete devices. The present embodiment is specifically described by taking a base station as an example.

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 1 is a flowchart of a cell search method according to a first embodiment of the present invention.

The present embodiment may be applied to a cell search scenario for a low capability terminal, which may be, for example, a low capability terminal supporting only a 5MHz bandwidth and supporting only a 15KHz subcarrier spacing. Next, a terminal that performs the present embodiment will be referred to as a first terminal.

In a specific implementation, the cell search method provided in the following steps S101 and S102 may be performed by a chip having a cell search function in the terminal, or may be performed by a baseband chip in the terminal.

Specifically, referring to fig. 1, the cell search method according to the present embodiment may include the following steps:

step S101, a first synchronization signal block SSB is obtained, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of a first terminal;

step S102, when the current frequency point of the first SSB is not in accordance with the first terminal access requirement, determining the frequency point in accordance with the first terminal access requirement according to the first indication information.

More specifically, the first terminal is a low-capability terminal, and the first terminal access requirement at least includes: a maximum of 5 mhz is supported.

The frequency points meeting the access requirement of the first terminal at least meet the following conditions: the SSB sent by the frequency point and the common control resource set (namely, the control resource set No. 0) associated with the SSB meet the preset terminal capability. In an implementation, the SSB sent by the frequency channel meeting the access requirement of the first terminal needs to be also a CD-SSB.

The preset terminal capability at least comprises: the subcarrier spacing of the SSB is a first threshold and the subcarrier spacing of the common set of control resources associated with the SSB is a second threshold. For example, the first threshold and the second threshold are each 15 kilohertz (KHz).

Further, the frequency point information may be, for example, a global synchronization channel number (global synchronization channel number, abbreviated GSCN).

In one implementation, in step S101, the first terminal may blindly detect the synchronization signal block at a subcarrier interval of the second threshold on the synchronization grid, thereby successfully detecting the first SSB.

Further, the first terminal determines that the control resource set (i.e., coreset#0) of the common search space (Type 0-PDCCH) does not exist through a master information block (Master Information Block, abbreviated as MIB) carried in the first SSB, and confirms that the first SSB is a non-cell-defined SSB (NCD-SSB). At this time, it may be determined that the current frequency point at which the first SSB is transmitted does not meet the first terminal access requirement.

In one implementation, the first SSB is an NCD-SSB, where the first SSB may further include second indication information for indicating frequency point information of a frequency point where the second SSB is transmitted.

Specifically, the second SSB is a CD-SSB. For example, the second indication information may be carried by an offset value Kssb, controlResourceSetZero field and a searchSpaceZero field, so that the first terminal determines the frequency pointThe synchronization signal block is associated with a control resource set 0, and the synchronization signal block associated with the control resource set 0 is the second SSB indicated to the first terminal by the first SSB.

Further, the first indication information may further include third indication information, where the third indication information is used to indicate whether the frequency point for sending the second SSB meets the access requirement of the first terminal. For example, it may be further indicated in the PBCH content of the first SSB whether the offset value Kssb, controlResourceSetZero field and the subcarrier spacing of the second SSB and the control resource set number 0 associated with the second SSB at the location indicated by the searchSpaceZero field are 15KHz.

Therefore, the first terminal can directly determine whether the second SSB is accessible according to the third indication information, and does not need to judge after the second SSB is actually detected.

In one implementation, the first indication information may be carried by a master information block MIB and/or layer 1 payload of the first SSB. For example, the offset value Kssb in the second indication information may be composed of MIB and layer 1 payload together, and the controlresourceseetzero field and the searchSpaceZero field may be carried in MIB.

Further, for low frequencies (e.g., FR1 frequency range), there are 2 bits of idle bits in the layer 1 payload and 1 bit of idle bits in the MIB. The present embodiment may utilize these idle bits to carry the third indication information. For example, the third indication information may be carried using idle bits of the MIB. For another example, the third indication information may be carried with idle bits of the layer 1 payload. For another example, the third indication information may be jointly carried by the MIB and the idle bits of the layer 1 payload.

In one implementation, when the first SSB is NCD-SSB, step S102 may include the steps of: when the third indication information indicates that the frequency point for sending the second SSB meets the access requirement of the first terminal, determining the frequency point of the second SSB indicated by the second indication information as the frequency point meeting the access requirement of the first terminal; when the third indication information indicates that the frequency point of the second SSB does not meet the access requirement of the first terminal, the frequency point of the second SSB indicated by the second indication information is determined to be the frequency point which does not meet the access requirement of the first terminal.

For example, referring to fig. 2, assuming that the first SSB is not associated with CORESET #0, it may be determined that the first SSB does not meet the first terminal access requirement. At this time, the first terminal acquires the second instruction information and the third instruction information in the first SSB. Assume that the second indication information indicates that the second SSB is associated with CORESET #0 transmitted from a position shifted downward by 256 synchronization grids from the current frequency point at which the first SSB is transmitted, and the third indication information indicates that the subcarrier spacing of the second SSB and the associated CORESET #0 is 15KHz. The first terminal may determine that the second SSB is a synchronization signal block that meets the access requirements of the first terminal.

If the third indication information indicates that either of the subcarrier spacing of the second SSB and the associated CORESET #0 is not 15KHz. The first terminal may determine that the second SSB does not meet the first terminal access requirement.

In one implementation, after determining that the second SSB meets the access requirement of the first terminal in step S102, the first terminal may continue to perform the steps of: and carrying out cell search on the frequency point indicated by the second indication information.

In one implementation, after determining in step S102 that the second SSB does not meet the access requirement of the first terminal, the first terminal may continue to perform the steps of: the cell search is continued and the frequency point indicated by the second indication information is skipped at the time of the search.

In one embodiment, the offset kssb=30 in table 1 used when the first SSB is NCD-SSB corresponds toThe value is reserved, and the reserved code point is used for indicating subcarrier spacing information of the number 0 control resource set in the specific implementation.

Specifically, in this embodiment, the preset lookup table may be designed with reference to the format of table 1. The preset reference table may include a plurality of offset values and frequency point information of a plurality of frequency points, and an association relationship between the plurality of offset values and the plurality of frequency point information. The plurality of frequency points recorded in the preset comparison table are frequency points meeting the access requirement of the first terminal. The frequency point information of each frequency point can be the frequency domain range where the frequency point is located, such as a synchronous grid where the frequency point is located.

Alternatively, the preset comparison table may be obtained by perfecting the reserved code points based on table 1.

For example, using the reserved field in the line where kssb=30 in table 1, the reserved field includes 256 values in total, and can correspond to 256 frequency domain ranges, and in a certain frequency domain range indicated by the first SSB in the 256 frequency domain ranges, there are frequency points in which the transmission subcarrier intervals are both 15KHz of the synchronization signal block and the control resource set No. 0.

Further, the first indication information may include an offset value Kssb, and accordingly, step S102 may include the steps of: searching a preset comparison table, and determining frequency point information corresponding to the offset value indicated by the first indication information; and determining a frequency point meeting the access requirement of the first terminal according to the frequency point information obtained by searching.

In a typical application scenario, referring to fig. 3, assuming Kssb indicates a value of 30, 16×control resource zero+searchspace zero is 0, the preset lookup table is shown in table 2:

TABLE 2

In the application scenario, it may be determined that a frequency point meeting the access requirement of the first terminal exists between the corresponding frequency domain ranges { -1, -10 }. Further, after determining that the first SSB does not meet the first terminal access requirement, the first terminal may go through a frequency range of { -1, -10} to perform cell search. That is, the first terminal may search a range from shifting up the frequency point where the first SSB is located by 1 synchronization grid to shifting up by 10 synchronization grids.

Further, in this implementation, kssb=30 may be a code point specifically indicated to the first terminal as a low capability terminal supporting only 5MHz bandwidth and only 15KHz subcarrier spacing. For legacy terminals (legacy UEs), the row indication corresponding to 24 to 29 of the Kssb indication may be used, since the 15KHz SSB and CORESET #0 are readable by legacy terminals.

In a variation, the plurality of frequency points recorded in the preset reference table are frequency points which do not meet the access requirement of the first terminal. That is, with the reserved field in the line where kssb=30 in table 1, the reserved field includes 256 values in total, and can correspond to 256 frequency domain ranges, and in a certain frequency domain range indicated by the first SSB in the 256 frequency domain ranges, there are no frequency points where the transmission subcarrier intervals are both 15KHz of the synchronization signal block and the control resource set No. 0.

Further, the first indication information may include an offset value Kssb, and accordingly, step S102 may include the steps of: searching a preset comparison table, and determining frequency point information corresponding to the offset value indicated by the first indication information; and determining the frequency point obtained by searching as the frequency point which does not meet the access requirement of the first terminal when the cell searching is carried out.

In a typical application scenario, with continued reference to fig. 3, assuming Kssb indicates a value of 30, 16 x control resource zero + searchspace zero is 0, the preset lookup table is still as shown in table 2 above. After the first SSB is determined not to meet the first terminal access requirement, determining that no frequency point of the transmitted SSB meeting the first terminal access requirement exists between the frequency domain range of-1, -10 indicated by the first indication information. Thus, the first terminal skips the frequency range of { -1, -10} for cell search. For example, the first terminal may search a range from shifting the frequency point where the first SSB is located by 1 synchronization grid downward to shifting the frequency point by 2 synchronization grids downward.

In this variant, the legacy terminal cannot read the data of the line corresponding to kssb=30 in the table, but can search for the cell by itself.

In one implementation, if the first terminal determines that the control resource set of the common search space (i.e., CORESET # 0) exists through the MIB carried in the first SSB, the first SSB is determined to be a CD-SSB. At this time, the offset value Kssb in the first SSB indicates <23, and the control resource zero field and the searchSpaceZero field are used to indicate configuration information of CORESET # 0. If the first terminal determines that CORESET #0 associated with the first SSB is not 15KHz based on the field, it is determined that the current frequency point for transmitting the first SSB does not meet the access requirement of the first terminal.

In this embodiment, the first indication information may include fourth indication information, which is used to indicate frequency point information of a frequency point that meets or does not meet the access requirement of the first terminal. For example, the MIB carried by the PBCH of the first SSB and/or the idle bits of the layer 1 load may be used to further indicate that there are or are not SSB and control resource set number 0 that satisfy the preset terminal capability in the specific frequency domain range (also referred to as the frequency point range).

Specifically, the fourth indication information may include at least one valid code point, where the at least one valid code point corresponds to frequency point information of the at least one frequency point one by one. For each effective code point, the effective code point is used for indicating the corresponding frequency point to meet the access requirement of the first terminal. The corresponding relation between each effective code point and the frequency point information of the frequency points can be indicated to the terminal in advance by a pre-configured mode or a base station.

For example, the idle 2 bits of the L1 layer payload may indicate 3 frequency domain ranges, corresponding to 3 valid code points. For another example, the idle 3 bits of the MIB may indicate a range of 7 bins, corresponding to 7 valid code points.

Further, the fourth indication information may further include an invalid code point, where the invalid code point is used to indicate that the at least one frequency point does not meet the access requirement of the first terminal.

Taking idle 2 bits of the L1 layer load as an example, the first 3 code points may indicate 3 frequency domain ranges, and the 4 th code point may be an invalid code point, configured to indicate that all 3 frequency domain ranges corresponding to the first 3 code points do not meet the access requirement of the first terminal.

Taking idle 3 bits of MIB as an example, the first 7 code points may indicate 3 frequency domain ranges, and the 4 th code point may be an invalid code point, which is used to indicate that all 7 frequency domain ranges corresponding to the first 7 code points do not meet the access requirement of the first terminal.

When the MIB and the idle bits of the L1 layer load are combined into fourth indication information, more ranges may be preconfigured for indication. For example, combining the idle 2 bits of the L1 layer payload with 1 bit in the MIB idle bits may result in 8 code points to carry the fourth indication information.

Further, step S102 may include the steps of: when the fourth indication information comprises an effective code point, determining that a frequency point corresponding to the effective code point is or contains a frequency point meeting the access requirement of the first terminal; when the fourth indication information comprises invalid code points, determining that the frequency points corresponding to the valid code points are not or do not contain frequency points meeting the access requirement of the first terminal.

For example, the frequency point information of the frequency point corresponding to the effective code point may include a single code point, where the code point is a code point meeting the access requirement of the first terminal. For another example, the frequency point information of the frequency point corresponding to the effective code point may include a frequency domain range, where at least one frequency point meeting the access requirement of the first terminal exists in the frequency domain range.

For example, when the fourth indication information includes invalid code points, it is determined that all frequency points corresponding to the valid code points are not or do not include frequency points meeting the access requirement of the first terminal.

Taking the first indication of using the idle 2 bits of the layer 1 load as an example, referring to fig. 4, the idle 2 bits of the layer 1 load may have 4 code points in total, and 4 sets of information may be indicated. The first 3 groups are effective code points, and each effective code point corresponds to one interval. For example, 00 corresponds to the frequency domain range of { -1, -10};01 corresponds to the frequency domain range {1, 10};10 corresponds to the frequency domain range 11, 20. The 4 th code point 11 represents an invalid code point.

Assuming that the fourth indication information indicates 00 in this example, the first terminal searches the frequency domain range from shifting the frequency point where the first SSB is located by 1 synchronization grid up to shifting the frequency point where the first SSB is located by 10 synchronization grids up, as shown in fig. 4. Further, the first terminal may search for the third SSB at a subcarrier spacing of 15KHz in the frequency domain of { -1, -10}, and further determine that the subcarrier spacing of the associated CORESET #0 for the third SSB is also 15KHz.

Assuming that the fourth indication information indicates 11 in this example, it indicates that SSB and coreset#0 that do not simultaneously satisfy the 15KHz subcarrier spacing in the range of up 10 and down 20 synchronization grids of the synchronization grid where the first SSB is located are not found, and the first terminal tries to search for other frequency points outside the above range.

By adopting the embodiment, the energy consumption and the cell searching time delay of the terminal for searching the cell are greatly reduced by optimizing the searching frequency point indication of the terminal. Specifically, the terminal obtains additional frequency point information from the first SSB retrieved currently, where the additional frequency point information is used for the terminal to quickly determine a frequency point meeting the self-access requirement or quickly reject a frequency point not meeting the self-access requirement. Therefore, when the current frequency point for transmitting the first SSB does not meet the self access requirement, the terminal does not need to continuously perform blind detection on the SSB, and can search with certain directivity. For example, the terminal may directly search for a frequency point that meets its own access requirement, or the terminal may directly skip a frequency point that does not meet its own access requirement. This is advantageous in order to avoid wasting search time and terminal power consumption.

Further, the first indication information may be carried using idle bits of the layer 1 payload and/or MIB carried by the PBCH of the first SSB. And, the content specifically indicated by the first indication information may be different depending on whether the first SSB is NCD-SSB or CD-SSB.

For example, when the first SSB is an NCD-SSB, in addition to the existing indication manner (i.e. by the offset value Kssb and coreset#0 configuration field, search space field) to indicate the frequency point information of the frequency point of the second SSB, for a low capability terminal (5 MHz 15KHz SCS terminal) supporting only 5MHz bandwidth and only 15KHz subcarrier spacing, the idle bits of the layer 1 load and/or MIB are utilized to provide additional information to inform whether the frequency point of the second SSB meets the access requirement of the first terminal.

For another example, when the first SSB is a CD-SSB, the Kssb, the coreset#0 configuration field, and the search space field are used to indicate information of coreset#0, and then the layer 1 load and/or idle bits of the MIB may be used to indicate frequency point information of a frequency point that meets or does not meet the access requirement of the first terminal.

Fig. 5 is a schematic diagram of a cell search apparatus according to a second embodiment of the present invention. It will be appreciated by those skilled in the art that the cell search apparatus 1 according to the present embodiment may be used to implement the method technical solutions described in the embodiments described in fig. 1 to 4.

Specifically, referring to fig. 5, the cell search apparatus 1 of the present embodiment may include: the acquiring module 11 is configured to acquire a first synchronization signal block SSB, where the first SSB includes first indication information, where the first indication information is used to indicate frequency point information of a frequency point that meets or does not meet an access requirement of a first terminal; and the determining module 12 determines a frequency point meeting the first terminal access requirement according to the first indication information when the current frequency point sending the first SSB does not meet the first terminal access requirement.

For more details on the working principle and the working manner of the cell search apparatus 1, reference may be made to the related descriptions in fig. 1 to fig. 4, which are not repeated here.

In a specific implementation, the cell search apparatus 1 described above may correspond to a Chip having a cell search function in a terminal, or to a Chip having a data processing function, such as a System-On-a-Chip (SOC) or a baseband Chip; or corresponds to a chip module including a chip having a cell search function in the terminal; or corresponds to a chip module having a chip with a data processing function, or corresponds to a terminal.

Fig. 6 is a flowchart of a cell search method according to a third embodiment of the present invention.

The present embodiment may be applied to a cell search scenario for a low capability terminal, which may be, for example, a low capability terminal supporting only a 5MHz bandwidth and supporting only a 15KHz subcarrier spacing. The embodiment optimizes the frequency point information indicated by the base station to the terminal, can shorten the cell search time delay of the terminal and reduce the energy consumption of the terminal.

In a specific implementation, the cell search method provided in the following steps S101 to S102 may be performed by a chip with a broadcasting function in the base station, or may be performed by a baseband chip in the base station.

Specifically, referring to fig. 6, the cell search method according to the present embodiment may include: in step S601, a first synchronization signal block SSB is broadcasted, where the first SSB includes first indication information, where the first indication information is used to indicate frequency point information of a frequency point that meets or does not meet an access requirement of a first terminal.

It will be appreciated by those skilled in the art that the step S601 may be regarded as an execution step corresponding to the steps S101 to S102 described in the embodiments shown in fig. 1 to 4, and the two steps complement each other in terms of specific implementation principles and logic. Thus, explanation of nouns in this embodiment may refer to the related descriptions of the embodiments shown in fig. 1 to fig. 4, and are not repeated here.

For example, the base station side performs step S601 to broadcast the first SSB, and correspondingly, the terminal side performs step S101 to acquire the first SSB broadcast by the base station. The base station may determine the content specifically indicated by the first indication information according to whether the first SSB is a CD-SSB or an NCD-SSB.

In one implementation, the first SSB may define an SSB for a non-cell. In this embodiment, the first SSB may further include second indication information, where the second indication information is used to indicate frequency point information of a frequency point sending the second SSB, and the first indication information may include third indication information, where the third indication information is used to indicate whether the frequency point sending the second SSB meets the access requirement of the first terminal.

In another implementation, the first SSB may define an SSB for a cell, and the common set of control resources associated with the first SSB does not satisfy a preset terminal capability. In this embodiment, the first indication information may include fourth indication information, where the fourth indication information is used to indicate frequency point information of a frequency point that meets or does not meet the access requirement of the first terminal.

Specifically, the fourth indication information may include an invalid code point and at least one valid code point, where the at least one valid code point corresponds to frequency point information of at least one frequency point one by one, and for each valid code point, the valid code point is used to indicate that the corresponding frequency point meets the first terminal access requirement, and the invalid code point is used to indicate that the at least one frequency point does not meet the first terminal access requirement.

In one implementation, the first indication information may be carried by a primary information block and/or layer 1 load of the first SSB.

In an implementation, the first indication information may include an offset value selected from a preset reference table, where the preset reference table includes a plurality of offset values and frequency point information of a plurality of frequency points, and an association relationship between the plurality of offset values and the plurality of frequency point information, and the plurality of frequency points are frequency points that meet or do not meet the access requirement of the first terminal.

In one implementation, the cell meeting the access requirement of the first terminal at least meets the following conditions: and the SSB sent by the frequency point and the common control resource set associated with the SSB meet the preset terminal capability. The preset terminal capability at least comprises: the subcarrier spacing of the SSB is a first threshold, and the subcarrier spacing of the SSB-associated common control resource set is a second threshold. For example, the first and second thresholds may each be 15 khz. The first terminal is a low-capability terminal, and the first terminal access requirement at least comprises: a maximum of 5 mhz is supported. The frequency bin information may include: global synchronization channel number.

By the method, the base station can provide additional frequency point information for the terminal so as to guide the terminal to quickly determine the frequency points meeting the self-access requirement or quickly reject the frequency points not meeting the self-access requirement when searching the cell. Therefore, time and energy consumption of the terminal due to blind detection of the SSB are avoided.

Fig. 7 is a schematic diagram of a cell search apparatus according to a fourth embodiment of the present invention. Those skilled in the art will appreciate that the cell search apparatus 2 according to the present embodiment may be used to implement the method technical solution described in the embodiment described above with reference to fig. 6.

Specifically, referring to fig. 7, the cell search apparatus 2 of the present embodiment may include: the broadcasting module 21 is configured to broadcast a first synchronization signal block SSB, where the first SSB includes first indication information, where the first indication information is used to indicate frequency point information of a frequency point that meets or does not meet an access requirement of the first terminal.

For more details on the working principle and the working manner of the cell search device 2, reference may be made to the description related to fig. 6, which is not repeated here.

In a specific implementation, the cell search apparatus 2 may correspond to a Chip having a broadcasting function in a base station, or a Chip having a data processing function, such as a System-On-a-Chip (SOC), a baseband Chip, or the like; or corresponds to a chip module including a chip with a broadcasting function in the base station; or corresponds to a chip module having a data processing function chip or corresponds to a base station.

In a specific implementation, regarding each apparatus and each module/unit included in each product described in the above embodiments, it may be a software module/unit, or a hardware module/unit, or may be a software module/unit partially, or a hardware module/unit partially.

For example, for each device or product applied to or integrated on a chip, each module/unit included in the device or product may be implemented in hardware such as a circuit, or at least part of the modules/units may be implemented in software program, where the software program runs on a processor integrated inside the chip, and the rest (if any) of the modules/units may be implemented in hardware such as a circuit; for each device and product applied to or integrated in the chip module, each module/unit contained in the device and product can be realized in a hardware manner such as a circuit, different modules/units can be located in the same component (such as a chip, a circuit module and the like) or different components of the chip module, or at least part of the modules/units can be realized in a software program, the software program runs on a processor integrated in the chip module, and the rest (if any) of the modules/units can be realized in a hardware manner such as a circuit; for each device, product, or application to or integrated with the terminal, each module/unit included in the device, product, or application may be implemented by using hardware such as a circuit, different modules/units may be located in the same component (for example, a chip, a circuit module, or the like) or different components in the terminal, or at least part of the modules/units may be implemented by using a software program, where the software program runs on a processor integrated inside the terminal, and the remaining (if any) part of the modules/units may be implemented by using hardware such as a circuit.

The embodiment of the invention also provides a computer readable storage medium, which is a non-volatile storage medium or a non-transient storage medium, and a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to execute the steps of the cell searching method provided by any embodiment. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transitory) memory. The storage medium may include ROM, RAM, magnetic or optical disks, and the like.

The embodiment of the invention also provides another cell searching device, which comprises a memory and a processor, wherein the memory stores a computer program which can be run on the processor, and the processor executes the steps of the cell searching method provided by the corresponding embodiment of the above-mentioned figures 1 to 4 when running the computer program. For example, the cell search apparatus may be the cell search apparatus 1 shown in fig. 5 described above. For another example, the cell search apparatus may be a terminal.

The embodiment of the invention also provides another cell searching device, which comprises a memory and a processor, wherein the memory stores a computer program which can be run on the processor, and the processor executes the steps of the cell searching method provided by the corresponding embodiment of the above-mentioned figure 6 when running the computer program. For example, the cell search apparatus may be the cell search apparatus 2 shown in fig. 7 described above. For another example, the cell search apparatus may be a base station.

Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be implemented by a program that instructs related hardware, the program may be stored on a computer readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, etc.

The technical scheme of the application can be applied to 5G (5 generation) communication systems, 4G and 3G communication systems, and various communication systems of subsequent evolution, such as 6G and 7G.

The technical scheme of the application is also applicable to different network architectures, including but not limited to a relay network architecture, a double link architecture and a Vehicle-to-evaluation (communication from a Vehicle to any object) architecture.

The 5G CN in the embodiments of the present application may also be referred to as a new core network (new core), or a 5G NewCore, or a next generation core network (next generation core, NGC), etc. The 5G-CN is arranged independent of existing core networks, e.g. evolved packet core (evolved packet core, EPC).

The embodiment of the application defines a unidirectional communication link from an access network to a terminal as a downlink, wherein data transmitted on the downlink is downlink data, and the transmission direction of the downlink data is called as a downlink direction; and the unidirectional communication link from the terminal to the access network is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is called as uplink direction.

It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" indicates that the front and rear associated objects are an "or" relationship.

The term "plurality" as used in the embodiments of the present application means two or more.

The first, second, etc. descriptions in the embodiments of the present application are only used for illustrating and distinguishing the description objects, and no order is used, nor is the number of the devices in the embodiments of the present application limited, and no limitation on the embodiments of the present application should be construed.

The "connection" in the embodiment of the present application refers to various connection manners such as direct connection or indirect connection, so as to implement communication between devices, which is not limited in the embodiment of the present application. The "network" and the "system" appearing in the embodiments of the present application express the same concept, and the communication system is a communication network.

It should be appreciated that in embodiments of the present application, the processor may be a central processing unit (central processing unit, abbreviated as CPU), other general purpose processor, digital signal processor (digital signal processor, abbreviated as DSP), application specific integrated circuit (application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example but not limitation, many forms of random access memory (random access memory, RAM) are available, such as Static RAM (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more sets of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus and system may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. A cell search method, comprising:

acquiring a first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of a first terminal;

When the current frequency point of the first SSB is not in accordance with the first terminal access requirement, determining the frequency point in accordance with the first terminal access requirement according to the first indication information.

2. The method of claim 1, wherein the first SSB further comprises second indication information, the second indication information is used for indicating frequency point information of a frequency point for transmitting the second SSB, and the first indication information comprises third indication information, the third indication information is used for indicating whether the frequency point for transmitting the second SSB meets the first terminal access requirement.

3. The method of claim 2, wherein the sending that the current frequency point of the first SSB does not meet the first terminal access requirement means: the first SSB defines an SSB for a non-cell, and determining, according to the first indication information, a frequency point meeting the access requirement of the first terminal includes:

when the third indication information indicates that the frequency point of the second SSB meets the access requirement of the first terminal, determining the frequency point of the second SSB indicated by the second indication information as the frequency point meeting the access requirement of the first terminal;

when the third indication information indicates that the frequency point of the second SSB is not in accordance with the access requirement of the first terminal, the frequency point of the second SSB indicated by the second indication information is determined to be the frequency point not in accordance with the access requirement of the first terminal.

4. The method of claim 1, wherein the first indication information includes fourth indication information, where the fourth indication information is used to indicate frequency point information of a frequency point that meets or does not meet the access requirement of the first terminal.

5. The method of claim 4, wherein the fourth indication information includes an invalid code point and at least one valid code point, the at least one valid code point and frequency point information of at least one frequency point are in one-to-one correspondence, and for each valid code point, the valid code point is used to indicate that the corresponding frequency point meets the first terminal access requirement, and the invalid code point is used to indicate that the at least one frequency point does not meet the first terminal access requirement.

6. The method of claim 5, wherein the sending the current frequency point of the first SSB not meeting the first terminal access requirement means: the first SSB defines an SSB for a cell, and the common control resource set associated with the first SSB does not meet a preset terminal capability, and determining, according to the first indication information, a frequency point meeting an access requirement of the first terminal includes:

when the fourth indication information comprises the effective code point, determining that the frequency point corresponding to the effective code point is or contains the frequency point meeting the access requirement of the first terminal;

And when the fourth indication information comprises the invalid code point, determining that the frequency point corresponding to the valid code point is not or does not contain the frequency point meeting the access requirement of the first terminal.

7. The method according to any of claims 1 to 6, wherein the first indication information is carried by a primary information block and/or layer 1 load of the first SSB.

8. The method of claim 1, wherein the first indication information comprises an offset value, and wherein the current frequency point at which the first SSB is transmitted does not meet the first terminal access requirement means: the first SSB defines an SSB for a non-cell, and determining, according to the first indication information, a frequency point meeting the access requirement of the first terminal includes:

searching a preset comparison table, and determining frequency point information corresponding to the offset value indicated by the first indication information, wherein the preset comparison table comprises a plurality of offset values, frequency point information of a plurality of frequency points and association relations between the plurality of offset values and the plurality of frequency point information, and the plurality of frequency points are frequency points meeting or not meeting the access requirement of the first terminal;

and determining a frequency point meeting the access requirement of the first terminal according to the frequency point information obtained by searching, or determining the frequency point obtained by searching as a frequency point which does not meet the access requirement of the first terminal when cell searching is carried out.

9. The method according to any one of claims 1 to 8, wherein the frequency points meeting the access requirements of the first terminal at least meet the following conditions: and the SSB sent by the frequency point and the common control resource set associated with the SSB meet the preset terminal capability.

10. The method of claim 9, wherein the preset terminal capability comprises at least: the subcarrier spacing of the SSB is a first threshold, and the subcarrier spacing of the SSB-associated common control resource set is a second threshold.

11. The method of claim 10, wherein the first and second thresholds are each 15 kilohertz.

12. The method according to any of claims 1 to 11, wherein the first terminal is a low capability terminal, and wherein the first terminal access requirements at least include: a maximum of 5 mhz is supported.

13. The method according to any one of claims 1 to 11, wherein the frequency bin information comprises: global synchronization channel number.

14. A cell search method, comprising:

and broadcasting a first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal.

15. The method of claim 14, wherein the first SSB defines an SSB for a non-cell, the first SSB further comprising second indication information for indicating frequency point information of a frequency point transmitting the second SSB, the first indication information comprising third indication information for indicating whether the frequency point transmitting the second SSB meets the first terminal access requirement.

16. The method of claim 14, wherein the first SSB defines an SSB for a cell and the common set of control resources associated with the first SSB does not satisfy a preset terminal capability;

the first indication information comprises fourth indication information, and the fourth indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal.

17. The method of claim 16, wherein the fourth indication information includes an invalid code point and at least one valid code point, the at least one valid code point and frequency point information of at least one frequency point are in one-to-one correspondence, and for each valid code point, the valid code point is used to indicate that the corresponding frequency point meets the first terminal access requirement, and the invalid code point is used to indicate that the at least one frequency point does not meet the first terminal access requirement.

18. The method according to any of claims 14 to 17, wherein the first indication information is carried by a primary information block and/or layer 1 load of the first SSB.

19. The method of claim 14, wherein the first indication information includes an offset value selected from a preset reference table, the preset reference table includes a plurality of offset values and frequency point information of a plurality of frequency points, and an association relationship between the plurality of offset values and the plurality of frequency point information, and the plurality of frequency points are frequency points that meet or do not meet the access requirement of the first terminal.

20. The method according to any of the claims 14 to 19, characterized in that the cell meeting the access requirements of the first terminal fulfils at least the following conditions: and the SSB sent by the frequency point and the common control resource set associated with the SSB meet the preset terminal capability.

21. The method of claim 20, wherein the preset terminal capability comprises at least: the subcarrier spacing of the SSB is a first threshold, and the subcarrier spacing of the SSB-associated common control resource set is a second threshold.

22. The method of claim 21, wherein the first and second thresholds are each 15 kilohertz.

23. The method according to any of claims 14 to 22, wherein the first terminal is a low capability terminal, and wherein the first terminal access requirements at least include: a maximum of 5 mhz is supported.

24. The method according to any one of claims 14 to 22, wherein the frequency bin information comprises: global synchronization channel number.

25. A cell search apparatus, comprising:

the acquisition module is used for acquiring a first synchronous signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal;

and the determining module is used for determining the frequency point meeting the access requirement of the first terminal according to the first indication information when the current frequency point of the first SSB is not met the access requirement of the first terminal.

26. A cell search apparatus, comprising:

and the broadcasting module is used for broadcasting the first synchronization signal block SSB, wherein the first SSB comprises first indication information, and the first indication information is used for indicating frequency point information of frequency points meeting or not meeting the access requirement of the first terminal.

27. A computer readable storage medium, being a non-volatile storage medium or a non-transitory storage medium, having stored thereon a computer program, characterized in that the computer program when executed by a processor performs the steps of the method according to any of claims 1 to 24.

28. A cell search apparatus comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor executes the steps of the method according to any of claims 1 to 24 when the computer program is executed.