CN112788634B

CN112788634B - Communication system, method, apparatus, computer device, and storage medium

Info

Publication number: CN112788634B
Application number: CN201911059395.1A
Authority: CN
Inventors: 杨小平; 彭岳峰; 周雄
Original assignee: Guangzhou Haige Communication Group Inc Co
Current assignee: Guangzhou Haige Communication Group Inc Co
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2023-06-02
Anticipated expiration: 2039-11-01
Also published as: CN112788634A

Abstract

The application relates to a communication system, a method, an apparatus, a computer device and a storage medium. The system comprises: base station and terminal. The base station is used for acquiring an original information set block; the original information set block comprises a downlink synchronous signal; copying the original information set block to obtain a mirror image information set block; transmitting the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands; the terminal is used for receiving the original information set block and the mirror image information set block which are sent by the base station; and when the original information set block is interfered and the downlink synchronous signal cannot be obtained, decoding the mirror image information set block to obtain the downlink synchronous signal. The method can improve the anti-interference capability of the cell and enhance the robustness of the decoding of the cell synchronous signal block.

Description

Communication system, method, apparatus, computer device, and storage medium

Technical Field

The present application relates to the field of mobile communications, and in particular, to a new radio communication system, method, apparatus, computer device and storage medium.

Background

In the civil communication field, a 3GPP (3 rd Generation Partnership Project, third generation partnership project) standardization organization is currently developing 5G NR (New Radio) standard for improving the performance of a mobile communication network. In the private network communication field, there is also a general demand for improving network performance, and the data transmission rate of the private network can be greatly improved by applying the NR technology to the private network communication.

However, compared to civilian communications, private network communications have special application scenarios and application requirements. Firstly, private network communication lacks a formally authorized exclusive frequency band, and possibly multiple communication technologies share the same frequency band, so that electromagnetic environment in a working frequency band is complex, and even stronger electromagnetic interference occurs; second, private network equipment may be subject to deliberate interference by adversaries while in operation, resulting in stronger interference within the operating bandwidth. When NR is applied to private network communication, under the strong interference environment, the condition that the decoding of the downlink synchronous signal fails easily occurs, so that the terminal cannot realize downlink synchronization with the base station, cell search cannot be completed, and finally the terminal cannot reside and access under the base station.

Therefore, when the 5G NR technology is applied to the private network communication field, there is a problem that the downlink synchronization signal is easily interfered, and thus the downlink synchronization and the cell search cannot be realized.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a communication system, a method, an apparatus, a computer device, and a storage medium with a high anti-interference capability.

A communication system includes a base station and a terminal;

the base station is used for acquiring an original information set block; the original information set block comprises a downlink synchronous signal; copying the original information set block to obtain a mirror image information set block; transmitting the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands;

the terminal is used for receiving the original information set block and the mirror image information set block which are sent by the base station; and when the original information set block is interfered and the downlink synchronous signal cannot be obtained from the original information set block, the mirror image information set block is decoded to obtain the downlink synchronous signal.

In one embodiment, the base station is further configured to obtain a block parameter of the original information set block; obtaining the maximum number of blocks of the mirror image information set block according to the block parameters; determining the number of the blocks of the mirror image information set block according to the maximum value of the number of the blocks; obtaining the required downlink sub-band bandwidth according to the number of the blocks; and determining the plurality of downlink sub-bands according to the required downlink sub-band bandwidth.

In one embodiment, the base station is further configured to determine, according to a preset synchronization signal position parameter, a subband position of the plurality of downlink subbands; the downlink sub-band bandwidths of the plurality of downlink sub-bands meet the required downlink sub-band bandwidth; and determining the plurality of downlink subbands according to the subband positions.

In one embodiment, the terminal is further configured to search the original information set block and the mirror image information set block according to a preset synchronization signal position parameter to obtain a target information set block; the target information set block consists of a target synchronous signal block, a target control resource set and target minimum system information; and decoding the target synchronous signal block in the target information set block to obtain synchronous signal block information.

In one embodiment, the terminal is further configured to obtain, when the synchronization signal block information is decoding success information, the downlink synchronization signal and control resource set scheduling information through the synchronization signal block information; decoding the target control resource set in the target information set block according to the control resource set scheduling information to obtain control resource set information;

And returning to the step of searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block when the synchronous signal block information is decoding failure information.

In one embodiment, the terminal is further configured to obtain minimum system information scheduling information through the control resource set information when the control resource set information is decoding success information; decoding the target minimum system information in the target information set block according to the minimum system information scheduling information to obtain minimum system information; outputting downlink synchronous information when the minimum system information is decoding success information, otherwise returning to the step of searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block;

and returning to the step of searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block when the control resource set information is decoding failure information.

A method of communication, comprising:

acquiring an original information set block; the original information set block comprises a downlink synchronous signal;

copying the original information set block to obtain a mirror image information set block;

transmitting the original information set block and the mirror image information set block to a terminal through a plurality of downlink subbands; and the terminal is used for decoding the mirror image information set block to obtain the downlink synchronous signal when the original information set block is interfered and the downlink synchronous signal cannot be obtained.

A method of communication, comprising:

receiving an original information set block and a mirror image information set block which are sent by a base station; the original information set block comprises a downlink synchronous signal; the mirror image information set block is a copy of the original information set block;

and when the original information set block is interfered and the downlink synchronous signal cannot be obtained from the original information set block, the mirror image information set block is decoded to obtain the downlink synchronous signal.

A communication apparatus, comprising:

the input module is used for acquiring an original information set block;

the processing module is used for copying the original information set block to obtain a mirror image information set block;

And the sending module is used for sending the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands.

A communication apparatus, comprising:

the receiving module is used for receiving the original information set block and the mirror image information set block which are sent by the base station;

and the decoding module is used for decoding the mirror image information set block to obtain the downlink synchronous signal when the original information set block is interfered and the downlink synchronous signal cannot be obtained from the original information set block.

A computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of:

acquiring an original information set block; the original information set block comprises a downlink synchronous signal; copying the original information set block to obtain a mirror image information set block; transmitting the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands;

receiving the original information set block and the mirror image information set block sent by the base station; and when the original information set block is interfered and the downlink synchronous signal cannot be obtained, decoding the mirror image information set block to obtain the downlink synchronous signal.

A computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:

According to the communication system, the method, the device, the computer equipment and the storage medium, the base station copies the original information set block containing the downlink synchronous signals to obtain the mirror image information set block, the mirror image information set block contains the same downlink synchronous signals as the original information set block, the original information set block and the mirror image information set block are sent to the terminal through a plurality of downlink subbands, multiple groups of downlink synchronous signals can be ensured to be transmitted to the terminal, the terminal receives the original information set block and the mirror image information set block, when the original information set block is interfered, the mirror image information set block can be decoded to obtain the downlink synchronous signals due to the fact that the mirror image information set block contains the same downlink synchronous signals as the original information set block, and the effects of improving the anti-interference capability of a cell and enhancing the decoding robustness of the cell synchronous signal block can be achieved under the condition of signal interference.

Drawings

FIG. 1 is a block diagram of a communication system in one embodiment;

FIG. 2 is a time-frequency block diagram of a synchronization signal block of a communication system in one embodiment;

FIG. 3 is a schematic diagram of an original information set block and a mirror information set block of a communication system in one embodiment;

FIG. 4 is a flow chart of an implementation of a communication system in one embodiment;

FIG. 5 is a block diagram of a communication device in one embodiment;

FIG. 6 is a block diagram of another communication device in one embodiment;

fig. 7 is an internal structural diagram of a computer device in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

In one embodiment, as shown in FIG. 1, a communication system 102 is provided that includes a base station 104 and a terminal 106, the base station 104 and the terminal 106 communicating over a wireless network. The base station 104 may be, but not limited to, an NR macro base station, an NR small base station, and an NR private network base station, and the terminal 106 may be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, portable wearable devices, and private network terminals.

A base station 104, configured to obtain an original information set block; the original information set block contains a downlink synchronous signal; copying the original information set block to obtain a mirror image information set block; and transmitting the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands.

The information set block is a time-frequency resource block containing downlink synchronous information and system information.

Wherein the original information set block is an information set block originally configured in the base station 104. For example, the raw information set block may consist of SSB (Synchronization Signal Block ), CORESET0 (Control Resource Set Zero, control resource set 0) and RMSI (Remaining Minimum System Information, minimum system information); the SSB includes a downlink synchronization signal, where the downlink synchronization signal is used to implement downlink synchronization and cell search, and CORESET0 and RMSI are used to transmit system information.

The mirror information set block may be an information set block obtained by copying an original information set block. For example, the mirror information set block may be composed of SSB, coreset0_m (mirror of coreset0) and RMSI.

In a specific implementation, after obtaining the PCI (Physical Cell Identity, physical cell identifier), PSS (Primary Synchronization Signal ) and SSS (Secondary Synchronization Signal, secondary synchronization signal), the base station 104 places the PSS and SSS in the SSB, and integrates the SSB, CORESET0 and RMSI into an original information set block, and copies the original information set block to obtain a mirror information set block, where the mirror information set block may be one or more. The base station 104 determines the sub-band bandwidths and center frequencies of the plurality of downlink sub-bands according to parameters such as the downlink bandwidth and the cell operating frequency band, marks each downlink sub-band according to the synchronization signal position parameter, and sends the original information set block and the mirror image information set block to the terminal 106 through the plurality of downlink sub-bands.

For example, in the frequency band from 615MHz to 665MHz, the downlink operation bandwidth is 50MHz, each original information set block or mirror image information set block occupies 24 RBs (Resource blocks), and the maximum number of downlink subbands can be calculated according to the above parameters to be 11. The method comprises the steps of setting 4 downlink sub-bands, uniformly distributing the downlink sub-bands on the whole downlink bandwidth, selecting one of the downlink sub-bands to transmit an original information set block, copying the original information set block to obtain 3 mirror image information set blocks, and transmitting the mirror image information set blocks through the other 3 downlink sub-bands, wherein the corresponding synchronization signal position parameters GSCN (Global Synchronization Channel Number, synchronization signal grid) are 1554, 1584, 1614 and 1644, and each downlink sub-band is used for transmitting one mirror image information set block.

A terminal 106, configured to receive an original information set block and a mirror image information set block sent by a base station; when the original information set block is interfered and the downlink synchronous signal can not be obtained from the original information set block, the mirror image information set block is decoded to obtain the downlink synchronous signal.

In a specific implementation, after the terminal 106 is started, the terminal 106 receives an original information set block and an image information set block sent by the base station 104, searches in an operating frequency band according to a synchronization signal position parameter to obtain an original information set block, decodes the original information set block, and when a frequency domain position corresponding to the original information set block is interfered, and cannot decode to obtain a downlink synchronization signal and performs cell search, the terminal 106 re-searches in the operating frequency band to obtain an image information set block, decodes the image information set block to obtain a downlink synchronization signal, and if the image information set block is still interfered, re-searches the image information set block.

For example, GSCNs corresponding to 1 original information set block and 3 mirror image information set blocks sent by the base station 104 are 1554, 1584, 1614 and 1644 respectively, the terminal 106 receives the original information set block and the mirror image information set block after being powered on, initializes the GSCN to 1500, and searches the original information set block or the mirror image information set block in the working frequency band with +1 as a step size. When the original information set block is searched at 1554, decoding the original information set block, if the decoding failure is caused by stronger interference signals at the moment, searching the mirror image information set block again by taking +1 as a step length until the mirror image information set block is searched at 1584, and if the decoding failure is still caused, searching the mirror image information set block again until the decoding is successful, and obtaining the downlink synchronous signal.

In this embodiment, when searching in the operating frequency band according to the synchronization signal position parameter, the terminal 106 may be the mirror information set block searched first, and when the downlink synchronization signal cannot be decoded by the mirror information set block and re-searched, the original information set block may be searched. The sequence in which the original information set block and the mirror information set block are searched is affected by the downlink subband position. For example, when GSCN corresponding to 1 original information set block and 3 mirror information set blocks sent by the base station 104 are 1614, 1554, 1584 and 1644 respectively, GSCN is initialized to 1500, searching is performed with +1 as step length, firstly searching for a mirror information set block at 1554, when decoding of the mirror information set block fails, searching for a next mirror information set block at 1584, if decoding still fails, searching for an original information set block at 1614, and obtaining a downlink synchronization signal through the original information set block.

According to the downlink synchronous signal communication system, the base station copies the original information set block containing the downlink synchronous signal to obtain the mirror image information set block, the mirror image information set block contains the same downlink synchronous signal as the original information set block, the original information set block and the mirror image information set block are sent to the terminal through the plurality of downlink subbands, multiple groups of downlink synchronous signals can be ensured to be transmitted to the terminal, the terminal receives the original information set block and the mirror image information set block, when the original information set block is interfered, the mirror image information set block contains the same downlink synchronous signal as the original information set block, the mirror image information set block can be decoded to obtain the downlink synchronous signal, and the downlink synchronous signal and the cell search can be realized under the condition of signal interference, so that the effects of improving the anti-interference capability of a cell and enhancing the robustness of decoding of the cell synchronous signal block are achieved.

Fig. 2 is a time-frequency block diagram of a synchronization signal block of a communication system in one embodiment, in which there are SSBs 202, PSS 204, pbch (Physical Broadcast Channel ) 206, and SSS208.SSB 202 occupies 20 RBs in the frequency domain and 4 OFDM symbols in the time domain.

Fig. 3 is a schematic diagram of an original information set block and a mirror information set block of a communication system in one embodiment, where there is an original information set block 302, a mirror information set block 304,SSB 306,CORESET0308,CORESET0_M 310,RMSI 312, and a GSCN 314.

Wherein the synchronization signal position parameter GSCN 314 is used to mark the frequency domain position of the SSB 306.

In a specific implementation, the SSB 306 in the original information set block 302 may be a CD-SSB (Cell Defined SSB, cell Defined synchronization signal block), and is associated with a CORESET0308, and the SSB 306 in each mirror information set block 304 is associated with a CORESET0_m 310,CORESET0_M 310, which is identical to the time-frequency resource size and the carried information content of CORESET0308, but needs to be completely staggered in the frequency domain location, where the CORESET0308 and the CORESET 0_m310 are used to send the scheduling information of RMSI 312.

There are three mappings of CORESET0308 or CORESET 0M 310 to SSB 306 in the frequency domain: each mapping relationship corresponds to a time-frequency resource position, and the number of RBs in the frequency domain has a value range of {24, 48, 96}, for example, CORESET0308 or CORESET 0_m310 may be mapped with SSB 306 in mode 1 in the frequency domain, so as to ensure that SSB 306 and RMSI 312 are in the same subband in the frequency domain. The frequency domain resource location and size of CORESET0308 or CORESET 0M 310 are completely consistent with the downlink initial bandwidth part (InitialDownlinkBWP) resource location, and the base station transmits RMSI 312 in the downlink initial bandwidth part and staggers the type0-pdcch-css search space (searchspacero) and RMSI 312 in the time domain by time division multiplexing.

By releasing SSB 306, the terminal can acquire PCI information and MIB (Master Information Block ) information. PCI can uniquely identify a cell

Consists of two parts, and the mark in the cell group is +.>

And cell group identity +.>

Carried by PSS and SSS respectively, the specific constitution relation is->

After the terminal decodes the synchronization signal, it continues to decode the PBCH in the SSB, and in addition to obtaining the time-frequency information, it can obtain MIB information, and obtain CORESET0 308 or CORESET 0_m310 information of the schedule RMSI 312 and corresponding type0-pdcch-css public search space (searchspacero) information through the 8-bit field information carried by the pdcch-config-sib1 in the MIB information. The terminal firstly performs blind solution on the public search space corresponding to the type0-pdcch-css to acquire the downlink scheduling information of the RMSI 312, then decodes the RMSI 312 according to the downlink scheduling information, and when the decoding is successful, the terminal realizes the downlink synchronization and the cell search of the cell.

In another embodiment, the base station is further configured to obtain a block parameter of the original information set block; obtaining the maximum number of the blocks of the mirror image information set block according to the block parameters; determining the number of the image information set blocks according to the maximum value of the number of the blocks; obtaining the required downlink sub-band bandwidth according to the number of the blocks; and determining a plurality of downlink sub-bands according to the required downlink sub-band bandwidth.

Wherein, the block parameters of the original information set block comprise downlink bandwidth dl_bandwidth, upper boundary freq_high of the working Band, lower boundary freq_low of the working Band, working Band and the size of the resource block occupied by the control resource set

In a specific implementation, obtaining block parameters of an original information set block and the number N of RBs corresponding to dl_bandwidth _rb According to N _rb And

calculating the maximum value of the number of the image information set blocks as

Selecting the number N of the image information set blocks according to the above _ssb There is

N _ssb ≤N _{ssb_max}

According to N _ssb Requiring a downlink subband bandwidth of

Determination of N from dl_subband_bandwidth _ssb The center frequency of each downlink sub-band is used for obtaining a plurality of downlink sub-bands, N _ssb Configuration delivery is performed through layer 3 (network layer).

The center frequency of the downlink sub-bands needs to be determined according to the GSCN, and each SSB in the frequency domain is uniformly distributed in the cell bandwidth according to the GSCN requirement, namely, the downlink sub-bands are uniformly distributed in the cell bandwidth, and when the working frequency Band of the cell is known, the GSCN size can be determined according to the 5.4.2.1 th section of the 3GPP protocol TS 38.104V 15. N (N) _ssb The image information set blocks and the original information set blocks are transmitted by using different downlink sub-bands on a frequency domain; is completely aligned in the time domain and is transmitted according to the requirements of the 3GPP protocol.

In the method for transmitting the original information set block and the mirror image information set block through the plurality of downlink sub-channels, the theoretical value of the anti-interference capability of the cell can be reached within the working bandwidth

/>

For example, the block parameters dl_bandwidth=50 mhz, freq_high=665mhz, freq_low=615mhz, band=63,

according to dl_bandwidth N _rb =270, thereby obtaining

Taking N _ssb =3, i.e. 3 mirror information set blocks and 1 original information set block, 4 downlink subbands are required for transmission, each subband having a bandwidth of

In order to uniformly distribute the 4 downlink sub-bands in 615-665 MHz, GSCN may be taken as 1554, 1584, 1614 and 1644, respectively, and the corresponding downlink sub-bands may have center frequencies of 621.75MHz,633.75MHz,645.75MHz and 657.75MHz according to 3gpp ts38.101 table 5.4.3.1-1, respectively, and a plurality of downlink sub-bands may be determined according to bandwidths and center frequencies of the downlink sub-bands. By transmitting 3 mirror image information set blocks and 1 original information set block, the theoretical value of the anti-interference capability of the cell can reach P _interference ＝34×100％＝75％。

According to the technical scheme of the embodiment, the number of the blocks of the mirror image information set blocks is determined according to the block parameters of the original information set blocks, so that a plurality of downlink sub-bands are obtained, the original information set blocks and the mirror image information set blocks can be sent to the terminal through the plurality of downlink sub-bands, a plurality of groups of downlink synchronous signals are ensured to be transmitted to the terminal, and when the terminal receives interference from one group of downlink synchronous signals, the terminal can decode other groups of downlink synchronous signals, so that downlink synchronization and cell search are realized.

In another embodiment, the base station is further configured to determine a subband position of the plurality of downlink subbands according to a preset synchronization signal position parameter; the downlink sub-band bandwidths of the plurality of downlink sub-bands meet the downlink sub-band bandwidths required; a plurality of downlink subbands is determined based on the subband locations.

The synchronization signal position parameter is a GSCN parameter, and the subband positions of the plurality of downlink subbands are center frequencies of the plurality of downlink subbands.

In a specific implementation, after dl_subband_bandwidth is obtained, the center frequencies of the original information set block and the mirror information set block may be determined according to the GSCN, and if in each downlink subband, the center frequency of the downlink subband is the center frequency of the corresponding original information set block or mirror information set block, where the original information set block or mirror information set block is located in the middle portion of the entire downlink subband. Assuming that the center frequency of one of the original information set block or the mirror image information set block is f _c The lower frequency boundary of the corresponding sub-band can be determined as f _c -0.5 xdl_subband_bandwidth, frequency upper boundary f _c +0.5×dl_subband_bandwidth。

For example, dl_subband_bandwidth is 12.06MHz, when GSCN is 1554, the center frequency of the original information set block or the mirror information set block is 621.75MHz according to 3gpp ts38.101 table 5.4.3.1-1, the center frequency of the corresponding downlink subband is 621.75MHz, the lower frequency boundary of the downlink subband is 621.75-0.5×12.06= 615.72MHz, and the upper frequency boundary is 621.75+0.5×12.06= 627.78MHz.

According to the technical scheme of the embodiment, the sub-band positions of the downlink sub-bands are determined according to the preset synchronous signal position parameters, the synchronous signal position parameters prescribe a position set where the downlink synchronous signals can be placed, when the working bandwidth of the system is large, the downlink synchronous signal search of the terminal in a large frequency range can be avoided, and the complexity of the terminal cell search process is reduced.

In another embodiment, the terminal is further configured to search the original information set block and the mirror image information set block according to a preset synchronization signal position parameter to obtain a target information set block; the target information set block consists of a target synchronous signal block, a target control resource set and target minimum system information; and decoding the target synchronous signal block in the target information set block to obtain synchronous signal block information.

The target information set block is an original information set block or an image information set block which is obtained by searching in the working frequency band according to the GSCN.

Wherein the target synchronization signal block, the target control resource set and the target minimum system information are SSB, CORESET0 (or CORESET 0_m) and RMSI in the target information set block, respectively.

The synchronous signal block information is synchronous signal block decoding success/failure information, and when the synchronous signal block information is synchronous signal block decoding success information, the synchronous signal block information also comprises downlink synchronous signals, cell PCI and control resource set scheduling information.

In specific implementation, the terminal searches the original information set block and the mirror image information set block according to the GSCN, when the signal energy is not zero, the corresponding original information set block or mirror image information set block is determined to be a target information set block, SSB in the target information set block is decoded, when the decoding is successful, the synchronous signal block information is synchronous signal block decoding success information, and when the decoding is failed, the synchronous signal block information is synchronous signal block decoding failure information.

For example, after the terminal is started, an original information set block and a mirror image information set block are received, the size of the GSCN is determined according to the current working frequency Band, the original information set block is located at the GSCN 1554, 3 mirror image information set blocks are located at the GSCN 1584, 1614 and 1644 respectively, the GSCN is initialized to 1500, searching is performed by taking +1 as a step length, when the original information set block is searched at the 1554, the original information set block is determined to be a target information set block, and SSB thereof is decoded to obtain synchronous signal block information. The synchronization signal block information may be SSB decoding success information or SSB decoding failure information.

According to the technical scheme of the embodiment, the terminal searches the original information set block and the mirror image information set block according to the preset synchronous signal position parameter, so that complexity of a cell searching process can be reduced, after the target information set block is obtained, the target synchronous signal block in the target information set block is decoded, and downlink synchronous signals, cell PCI and control resource set scheduling information can be obtained.

In another embodiment, the terminal is further configured to obtain, when the synchronization signal block information is decoding success information, downlink synchronization signal and control resource set scheduling information through the synchronization signal block information; decoding a target control resource set in the target information set block according to the control resource set scheduling information to obtain control resource set information; and returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter when the synchronous signal block information is the decoding failure information, so as to obtain a target information set block.

Wherein the control resource set scheduling information is the scheduling signaling of CORESET0 (or CORESET 0M).

Wherein the control resource set information is control resource set decoding success/failure information, and when the control resource set information is control resource set decoding success information, the control resource set information also comprises RMSI scheduling information.

In a specific implementation, when the synchronization signal block information is successful decoding information of the synchronization signal block, it means that SSB can be successfully decoded, PCI including downlink synchronization signal and MIB including control resource set scheduling information are obtained from SSB, CORESET0 (or CORESET 0_m) is decoded according to the control resource set scheduling information, when decoding is successful, control resource set decoding success information is obtained, and when decoding is failed, control resource set decoding failure information is obtained.

When the synchronous signal block information is synchronous signal block decoding failure information, returning to the step of decoding the synchronous signal block, determining a target information set block again according to the GSCN, and after the target information set block is selected, carrying out the decoding process of SSB and CORESET0 (or CORESET 0_M) again. For example, the original information set block is located at GSCN 1554, 3 image information set blocks are located at GSCN 1584, 1614 and 1644, respectively, when SSB decoding fails at 1554, the original information set block and the image information set block are searched again in +1 step, if the image information set block is searched at 1584, the image information set block is selected as the target information set block, SSB and CORESET0 (or CORESET 0_m) decoding is performed again, and the above process is repeated until SSB and CORESET0 (or CORESET 0_m) decoding is successful.

According to the technical scheme of the embodiment, when the synchronous signal block is successfully decoded, synchronous signal block information and control resource set scheduling information can be obtained, and according to the control resource set scheduling information, the control resource set can be decoded to obtain control resource set information; when decoding fails, the target information set block can be re-acquired, and the synchronous signal block information and the control resource set information can be re-obtained, so that the effects of improving the anti-interference capability of the cell and enhancing the robustness of the cell synchronous signal block decoding are achieved.

In another embodiment, the terminal is further configured to obtain minimum system information scheduling information by controlling the resource set information when the control resource set information is decoding success information; decoding the target minimum system information in the target information set block according to the minimum system information scheduling information to obtain minimum system information; outputting downlink synchronous information when the minimum system information is decoding success information, otherwise returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block; and when the control resource set information is decoding failure information, returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block.

Wherein, the minimum system information scheduling information is the scheduling signaling of the RMSI.

Wherein the minimum system information is minimum system information decoding success/failure information.

The downlink synchronization information includes a downlink synchronization signal, a cell PCI and other system information.

In a specific implementation, when the control resource set information is control resource set decoding success information, it means that CORESET0 (or CORESET 0_m) can be successfully decoded, scheduling information of RMSI is obtained from CORESET0 (or CORESET 0_m), the RMSI is decoded according to the scheduling information indication, and when the decoding is successful, downlink synchronization, cell PCI and other system information are output.

If the decoding of the control resource set or the minimum system information fails, returning to the step of decoding the synchronous signal block, determining the target information set block again according to the GSCN, and after the target information set block is selected, carrying out the decoding process of SSB, CORESET0 (or CORESET 0_M) and RMSI again. For example, the original information set block is located at GSCN 1554, the 3 mirror information set blocks are located at GSCN 1584, 1614 and 1644, respectively, when SSB decoding is successful at 1554, coreset0 (or coreset0_m) decoding fails, or SSB and coreset0 (or coreset0_m) decoding is successful, RMSI decoding fails, searching again with +1 as step length, searching the mirror information set block at 1584, selecting the mirror information set block as target information set block, re-performing SSB, coreset0 (or coreset0_m) and RMSI decoding, repeating the above processes until SSB, coreset0 (or coreset0_m) and RMSI decoding is successful, outputting downlink synchronization signal, cell PCI and other system information, and implementing downlink synchronization and cell searching according to the above information.

According to the technical scheme of the embodiment, when the control resource set is successfully decoded, the minimum system information scheduling information can be obtained, and the minimum system information can be decoded according to the minimum system information scheduling information to obtain the minimum system information; when decoding fails, the target information set block can be re-acquired, and the downlink synchronous signal and the control resource set information can be re-obtained, so that the effects of improving the anti-interference capability of the cell and enhancing the robustness of the decoding of the cell synchronous signal block are achieved.

FIG. 4 provides a flow chart of an implementation of a communication system for ease of understanding by those of ordinary skill in the art; in a specific implementation, a base station acquires block parameters of an original information set block, including downlink bandwidth, the number of RBs of the original information set block, GSCN and the like, determines sub-band bandwidths and center frequencies of a plurality of downlink sub-bands according to the block parameters, replicates the original information set block to obtain one or more mirror image information set blocks, and sends the original information set block and the mirror image information set block through the plurality of downlink sub-bands, wherein one downlink sub-band is used for transmitting one original information set block or mirror image information set block. After the terminal is started, an original information set block and a mirror image information set block are received, GSCN is initialized, for example, 1500 is initialized, the original information set block or the mirror image information set block is searched at GSCN=1500, SSB is decoded when the original information set block or the mirror image information set block is searched, PCI and MIB information can be obtained if the decoding is successful, CORESET0 (or CORESET 0_M) is then decoded according to MIB information, RMSI scheduling information can be obtained if the decoding is successful, RMSI is then decoded according to the RMSI scheduling information, and the terminal completes the downlink synchronization and cell searching process if the decoding is successful. In the above decoding process, once one of SSB, CORESET0 (or CORESET 0M), or RMSI fails to decode, gscn+1 is re-searched, e.g., at 1501, for the original information set block or the mirror information set block, and SSB, CORESET0 (or CORESET 0M), and RMSI are re-decoded until SSB, CORESET0 (or CORESET 0M), and RMSI are all successfully decoded. If the GSCN exceeds the upper boundary Freq_high of the operating frequency band, the failure of the cell search is indicated.

It should be understood that, although the steps in the flowchart of fig. 4 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 4 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.

In another embodiment, a communication method is provided, comprising the steps of: acquiring an original information set block; copying the original information set block to obtain a mirror image information set block; transmitting the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands; and the terminal is used for decoding the mirror image information set block to obtain the downlink synchronous signal when the original information set block is interfered and the downlink synchronous signal cannot be obtained.

In a specific implementation, a base station copies SSB, CORESET0 and RMSI in an original information set block to obtain one or more mirror image information set blocks, wherein the mirror image information set blocks contain SSB, CORESET0_M and RMSI, and the base station determines a plurality of downlink sub-bands according to parameters such as downlink bandwidth and cell working frequency band and sends the original information set block and the mirror image information set block to a terminal through the plurality of downlink sub-bands.

According to the technical scheme, the base station sends the original information set block and the mirror image information set block, when the terminal cannot decode from the original information set block to obtain the downlink synchronous signal, the mirror image information set block can be used for obtaining the downlink synchronous signal, so that the downlink synchronization and cell search are realized, and the effects of improving the anti-interference capability of the cell and enhancing the robustness of decoding the cell synchronous signal block are achieved.

In another embodiment, a communication method is provided, comprising the steps of: receiving an original information set block and a mirror image information set block which are sent by a base station; when the original information set block is interfered and the downlink synchronous signal can not be obtained from the original information set block, the mirror image information set block is decoded to obtain the downlink synchronous signal.

In a specific implementation, a terminal receives an original information set block and a mirror image information set block, searches the original information set block according to a GSCN, decodes the original information set block, and when decoding fails, searches the mirror image information set block again according to the GSCN to obtain a mirror image information set block, and decodes the mirror image information set block to obtain a downlink synchronous signal.

It should be noted that, according to the difference of the downlink sub-band positions occupied by the original information set block and the mirror image information set block, the first searched mirror image information set block may be the mirror image information set block, and when decoding the mirror image information set block fails and needs to be searched again, the original information set block or other mirror image information set blocks may be searched.

According to the technical scheme, the terminal receives the original information set block and the mirror image information set block, and when the downlink synchronous signal cannot be obtained by decoding from the original information set block, the downlink synchronous signal can be obtained through the mirror image information set block, so that the downlink synchronous and cell search are realized, and the effects of improving the anti-interference capability of the cell and enhancing the robustness of decoding of the cell synchronous signal block are achieved.

In another embodiment, a communication method is provided, comprising the steps of: obtaining block parameters of an original information set block; obtaining the maximum number of the blocks of the mirror image information set block according to the block parameters; determining the number of the image information set blocks according to the maximum value of the number of the blocks; obtaining the required downlink sub-band bandwidth according to the number of the blocks; and determining a plurality of downlink sub-bands according to the required downlink sub-band bandwidth.

In another embodiment, a communication method is provided, comprising the steps of: determining the sub-band positions of a plurality of downlink sub-bands according to preset synchronous signal position parameters; the downlink sub-band bandwidths of the plurality of downlink sub-bands meet the downlink sub-band bandwidths required; a plurality of downlink subbands is determined based on the subband locations.

In another embodiment, a communication method is provided, comprising the steps of: searching the original information set block and the mirror image information set block according to a preset synchronous signal position parameter to obtain a target information set block; the target information set block consists of a target synchronous signal block, a target control resource set and target minimum system information; and decoding the target synchronous signal block in the target information set block to obtain synchronous signal block information.

In another embodiment, a communication method is provided, comprising the steps of: when the synchronous signal block information is the decoding success information, obtaining downlink synchronous signals and control resource set scheduling information through the synchronous signal block information; decoding a target control resource set in the target information set block according to the control resource set scheduling information to obtain control resource set information; and returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter when the synchronous signal block information is the decoding failure information, so as to obtain a target information set block.

In another embodiment, a communication method is provided, comprising the steps of: when the control resource set information is the decoding success information, the minimum system information scheduling information is obtained through the control resource set information; decoding the target minimum system information in the target information set block according to the minimum system information scheduling information to obtain minimum system information; outputting downlink synchronous information when the minimum system information is decoding success information, otherwise returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block; and when the control resource set information is decoding failure information, returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block.

The specific limitation on the communication method may be referred to as limitation on the communication system hereinabove, and will not be described herein. The communication method provided by the above embodiment can be used for executing the communication system provided by any embodiment, and has corresponding functions and beneficial effects.

In one embodiment, as shown in fig. 5, there is provided a communication apparatus 500 comprising:

An input module 502, configured to obtain an original information set block;

the processing module 504 is configured to copy the original information set block to obtain a mirror image information set block;

a sending module 506, configured to send the original information set block and the mirror information set block to the terminal through a plurality of downlink subbands.

In one embodiment, the communication device 500 may be further configured to obtain a block parameter of the original information set block; obtaining the maximum number of the blocks of the mirror image information set block according to the block parameters; determining the number of the image information set blocks according to the maximum value of the number of the blocks; obtaining the required downlink sub-band bandwidth according to the number of the blocks; and determining a plurality of downlink sub-bands according to the required downlink sub-band bandwidth.

In one embodiment, the communication device 500 may be further configured to determine a subband position of the plurality of downlink subbands according to a preset synchronization signal position parameter; the downlink sub-band bandwidths of the plurality of downlink sub-bands meet the downlink sub-band bandwidths required; a plurality of downlink subbands is determined based on the subband locations.

The specific limitations regarding the communication device may be referred to above as limitations regarding the communication system, and will not be described in detail herein. The various modules in the communication device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

The communication device provided by the above embodiment can be used for executing the communication system provided by any embodiment, and has corresponding functions and beneficial effects.

In one embodiment, as shown in fig. 6, another communication device 600 is provided, comprising:

a receiving module 602, configured to receive an original information set block and a mirror image information set block sent by a base station;

the decoding module 604 is configured to obtain the downlink synchronization signal by decoding the mirror information set block when the original information set block is interfered and the downlink synchronization signal cannot be obtained from the original information set block.

In one embodiment, the communication apparatus 600 may be further configured to obtain, when the synchronization signal block information is decoding success information, downlink synchronization signal and control resource set scheduling information through the synchronization signal block information; decoding a target control resource set in the target information set block according to the control resource set scheduling information to obtain control resource set information; and returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter when the synchronous signal block information is the decoding failure information, so as to obtain a target information set block.

In one embodiment, the communication apparatus 600 may be further configured to obtain the minimum system information scheduling information by controlling the resource set information when the control resource set information is decoding success information; decoding the target minimum system information in the target information set block according to the minimum system information scheduling information to obtain minimum system information; outputting downlink synchronous information when the minimum system information is decoding success information, otherwise returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block; and when the control resource set information is decoding failure information, returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block.

In one embodiment, a computer device is provided, which may be a base station or a terminal, and the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of indoor positioning of an air sensor. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.

It will be appreciated by those skilled in the art that the structure shown in fig. 7 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of: acquiring an original information set block; the original information set block contains a downlink synchronous signal; copying the original information set block to obtain a mirror image information set block; and transmitting the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands.

In one embodiment, the processor when executing the computer program further performs the steps of: obtaining block parameters of an original information set block; obtaining the maximum number of the blocks of the mirror image information set block according to the block parameters; determining the number of the image information set blocks according to the maximum value of the number of the blocks; obtaining the required downlink sub-band bandwidth according to the number of the blocks; and determining a plurality of downlink sub-bands according to the required downlink sub-band bandwidth.

In one embodiment, the processor when executing the computer program further performs the steps of: determining the sub-band positions of a plurality of downlink sub-bands according to preset synchronous signal position parameters; the downlink sub-band bandwidths of the plurality of downlink sub-bands meet the downlink sub-band bandwidths required; a plurality of downlink subbands is determined based on the subband locations.

In one embodiment, the processor when executing the computer program further performs the steps of: receiving an original information set block and a mirror image information set block which are sent by a base station; when the original information set block is interfered and the downlink synchronous signal can not be obtained from the original information set block, the mirror image information set block is decoded to obtain the downlink synchronous signal.

In one embodiment, the processor when executing the computer program further performs the steps of: searching the original information set block and the mirror image information set block according to a preset synchronous signal position parameter to obtain a target information set block; the target information set block consists of a target synchronous signal block, a target control resource set and target minimum system information; and decoding the target synchronous signal block in the target information set block to obtain synchronous signal block information.

In one embodiment, the processor when executing the computer program further performs the steps of: when the synchronous signal block information is the decoding success information, obtaining downlink synchronous signals and control resource set scheduling information through the synchronous signal block information; decoding a target control resource set in the target information set block according to the control resource set scheduling information to obtain control resource set information; and returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter when the synchronous signal block information is the decoding failure information, so as to obtain a target information set block.

In one embodiment, the processor when executing the computer program further performs the steps of: when the control resource set information is the decoding success information, the minimum system information scheduling information is obtained through the control resource set information; decoding the target minimum system information in the target information set block according to the minimum system information scheduling information to obtain minimum system information; outputting downlink synchronous information when the minimum system information is decoding success information, otherwise returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block; and when the control resource set information is decoding failure information, returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block.

In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of: acquiring an original information set block; the original information set block contains a downlink synchronous signal; copying the original information set block to obtain a mirror image information set block; and transmitting the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands.

In one embodiment, the computer program when executed by the processor further performs the steps of: obtaining block parameters of an original information set block; obtaining the maximum number of the blocks of the mirror image information set block according to the block parameters; determining the number of the image information set blocks according to the maximum value of the number of the blocks; obtaining the required downlink sub-band bandwidth according to the number of the blocks; and determining a plurality of downlink sub-bands according to the required downlink sub-band bandwidth.

In one embodiment, the computer program when executed by the processor further performs the steps of: determining the sub-band positions of a plurality of downlink sub-bands according to preset synchronous signal position parameters; the downlink sub-band bandwidths of the plurality of downlink sub-bands meet the downlink sub-band bandwidths required; a plurality of downlink subbands is determined based on the subband locations.

In one embodiment, the computer program when executed by the processor further performs the steps of: receiving an original information set block and a mirror image information set block which are sent by a base station; when the original information set block is interfered and the downlink synchronous signal can not be obtained from the original information set block, the mirror image information set block is decoded to obtain the downlink synchronous signal.

In one embodiment, the computer program when executed by the processor further performs the steps of: searching the original information set block and the mirror image information set block according to a preset synchronous signal position parameter to obtain a target information set block; the target information set block consists of a target synchronous signal block, a target control resource set and target minimum system information; and decoding the target synchronous signal block in the target information set block to obtain synchronous signal block information.

In one embodiment, the computer program when executed by the processor further performs the steps of: when the synchronous signal block information is the decoding success information, obtaining downlink synchronous signals and control resource set scheduling information through the synchronous signal block information; decoding a target control resource set in the target information set block according to the control resource set scheduling information to obtain control resource set information; and returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter when the synchronous signal block information is the decoding failure information, so as to obtain a target information set block.

In one embodiment, the computer program when executed by the processor further performs the steps of: when the control resource set information is the decoding success information, the minimum system information scheduling information is obtained through the control resource set information; decoding the target minimum system information in the target information set block according to the minimum system information scheduling information to obtain minimum system information; outputting downlink synchronous information when the minimum system information is decoding success information, otherwise returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block; and when the control resource set information is decoding failure information, returning to searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A communication system comprising a base station and a terminal, characterized in that:

the base station is used for acquiring an original information set block; the original information set block consists of SSB, CORESET0 and RMSI, wherein the SSB contains a downlink synchronous signal; obtaining the maximum block number of the mirror image information set blocks according to the number of the resource blocks corresponding to the downlink bandwidth and the size of the resource blocks occupied by the CORESET 0; determining the number of the blocks of the mirror image information set block according to the maximum value of the number of the blocks; copying the original information set blocks according to the number of the mirror image information set blocks to obtain the mirror image information set blocks; transmitting the original information set block and the mirror image information set block to the terminal through a plurality of downlink subbands;

2. The system of claim 1, wherein the base station is further configured to obtain a required downlink subband bandwidth based on the number of blocks; and determining the plurality of downlink sub-bands according to the required downlink sub-band bandwidth.

3. The system of claim 2, wherein the base station is further configured to determine subband positions of the plurality of downlink subbands according to a preset synchronization signal position parameter; the downlink sub-band bandwidths of the plurality of downlink sub-bands meet the required downlink sub-band bandwidth; and determining the plurality of downlink subbands according to the subband positions.

4. The system of claim 1, wherein the terminal is further configured to search the original information set block and the mirror information set block according to a preset synchronization signal position parameter to obtain a target information set block; the target information set block consists of a target synchronous signal block, a target control resource set and target minimum system information; and decoding the target synchronous signal block in the target information set block to obtain synchronous signal block information.

5. The system of claim 4, wherein the terminal is further configured to obtain the downlink synchronization signal and control resource set scheduling information from the synchronization signal block information when the synchronization signal block information is decoding success information; decoding the target control resource set in the target information set block according to the control resource set scheduling information to obtain control resource set information;

6. The system of claim 5, wherein the terminal is further configured to obtain minimum system information scheduling information through the control resource set information when the control resource set information is decoding success information; decoding the target minimum system information in the target information set block according to the minimum system information scheduling information to obtain minimum system information; outputting downlink synchronous information when the minimum system information is decoding success information, otherwise returning to the step of searching the original information set block and the mirror image information set block according to the preset synchronous signal position parameter to obtain a target information set block;

7. A method of communication, comprising:

acquiring an original information set block; the original information set block consists of SSB, CORESET0 and RMSI, wherein the SSB contains a downlink synchronous signal;

obtaining the maximum block number of the mirror image information set blocks according to the number of the resource blocks corresponding to the downlink bandwidth and the size of the resource blocks occupied by the CORESET 0;

determining the number of the blocks of the mirror image information set block according to the maximum value of the number of the blocks;

copying the original information set blocks according to the number of the mirror image information set blocks to obtain the mirror image information set blocks;

8. A method of communication, comprising:

receiving an original information set block and a mirror image information set block which are sent by a base station through a plurality of downlink subbands; the original information set block consists of SSB, CORESET0 and RMSI, wherein the SSB contains a downlink synchronous signal; the base station acquires the original information set block, obtains the maximum block number of the mirror image information set block according to the number of the resource blocks corresponding to the downlink bandwidth and the size of the resource blocks occupied by the CORESET0, determines the block number of the mirror image information set block according to the maximum block number, and copies the original information set block according to the block number of the mirror image information set block to obtain the mirror image information set block;

9. A communication device, comprising:

the input module is used for acquiring an original information set block; the original information set block consists of SSB, CORESET0 and RMSI, wherein the SSB contains a downlink synchronous signal;

The processing module is used for obtaining the maximum number of blocks of the mirror image information set block according to the number of the resource blocks corresponding to the downlink bandwidth and the size of the resource blocks occupied by the CORESET0, determining the number of the blocks of the mirror image information set block according to the maximum number of the blocks, and copying the original information set block according to the number of the blocks of the mirror image information set block to obtain the mirror image information set block;

and the sending module is used for sending the original information set block and the mirror image information set block to a terminal through a plurality of downlink sub-bands so that the terminal can obtain the downlink synchronous signal by decoding the mirror image information set block when the original information set block is interfered and the downlink synchronous signal can not be obtained from the original information set block.

10. A communication device, comprising:

the receiving module is used for receiving the original information set block and the mirror image information set block which are sent by the base station through a plurality of downlink sub-bands; the original information set block consists of SSB, CORESET0 and RMSI, wherein the SSB contains a downlink synchronous signal; the base station acquires the original information set block, obtains the maximum block number of the mirror image information set block according to the number of the resource blocks corresponding to the downlink bandwidth and the size of the resource blocks occupied by the CORESET0, determines the block number of the mirror image information set block according to the maximum block number, and copies the original information set block according to the block number of the mirror image information set block to obtain the mirror image information set block;