CN112423381B - Method and device for judging SSB actual starting symbol in 5G cell search - Google Patents

Method and device for judging SSB actual starting symbol in 5G cell search Download PDF

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CN112423381B
CN112423381B CN202110094341.XA CN202110094341A CN112423381B CN 112423381 B CN112423381 B CN 112423381B CN 202110094341 A CN202110094341 A CN 202110094341A CN 112423381 B CN112423381 B CN 112423381B
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李大庆
杨明
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Jiangsu Yongding Communications Co ltd
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Abstract

The invention provides a method and a device for judging an SSB starting symbol mode in cell search, which are used as a storage medium, can quickly obtain the actual starting symbol sequence number of the SSB, simplify the process and have low calculation complexity, and the judging method comprises the following steps: the method comprises the steps that a PSS slides and relatively searches SSB in a set period, a certain amount of data of symbol is captured in the next set period, the SSB is decoded, a cell ID, an SSB index and MIB information are obtained, CRC (cyclic redundancy check) is carried out on the MIB information, if the check is correct, whether the lowest two bits of the SSB index are 00 or 11 is judged, an SSB starting symbol mode is judged respectively according to the condition that the lowest two bits of the SSB index are 00 or 11, the actual starting symbol sequence number of the SSB is confirmed, and the position of a 10ms frame header is determined; if not, directly starting the symbol sequence number by the SSB, and determining the position of the 10ms frame header.

Description

Method and device for judging SSB actual starting symbol in 5G cell search
Technical Field
The invention relates to the technical field of 5G communication, in particular to a method and a device for judging an SSB actual starting symbol in 5G cell search.
Background
Cell search is basically a process of searching and decoding SSBs (Synchronization Signal and PBCH block). Unlike 4G LTE, both the time and frequency domain positions of SSBs in 5G NR are no longer fixed, but are flexible. In the frequency domain, the SSB is no longer fixed in the middle of the band; in the time domain, the location and number of SSBs transmitting may vary. Therefore, in NR, complete synchronization of frequency domain and time domain resources cannot be obtained only by demodulating PSS/SSS signals, and synchronization of time-frequency resources can be finally achieved only by completing demodulation of PBCH.
An SSB is mainly composed of 4 parts, i.e., PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), PBCH (Physical Broadcast Channel), PBCH _ DMRS (Physical Broadcast Channel Demodulation Reference Signal), as shown in fig. 1, and includes 4 OFDM symbols in the time domain, numbered 0-3, and includes PSS, SSS, PBCH, and DMRS associated with PBCH; in a frequency domain, one SS/PBCH block occupies 240 continuous subcarriers, and the subcarriers are numbered from 0 to 239 in the block.
5G defines 1008 physical cell IDs, the value range is 0-1007, and the values are expressed by the following formula
Figure DEST_PATH_IMAGE001
where
Figure 65289DEST_PATH_IMAGE002
and
Figure DEST_PATH_IMAGE003
.
PSS sequence numbering corresponds to
Figure 920112DEST_PATH_IMAGE004
SSS sequence number corresponds to
Figure DEST_PATH_IMAGE005
The UE may obtain the PSS/SSS signal by demodulating the signal
Figure 76680DEST_PATH_IMAGE006
And synchronization of symbol. However, since the SSB distribution is not fixed on which symbols, the UE cannot determine the frame header position after demodulating PSS and SSS.
After the PCI is obtained, the position of the PBCH DMRS can be determined, and the position offset of the DMRS can be known from table 7.4.3.1-1 in TS38.211
Figure DEST_PATH_IMAGE007
. Demodulating PBCH DMRS to obtain SSB index
Figure 550518DEST_PATH_IMAGE008
And field information
Figure DEST_PATH_IMAGE009
。
In 5G, each SSB corresponds to a beam, and we discuss that the minimum time span of the SSB is 5ms, i.e., half frame.
Within 5ms, the maximum number of SSBs is defined as Lmax, which may be 4, 8, 64 for different SCS and frequency.
For a field with SSBs, the number of candidate SSBs and the first symbol index position determine the SSB start symbol pattern according to the subcarrier spacing of the SSBs as follows:
CaseA-15 kHz subcarrier spacing: the index of the first symbol of the candidate SSB is 2, 8 + 14 × n. For carrier frequencies less than or equal to 3 GHz, n =0, 1. For carrier frequencies greater than 3 GHz and less than or equal to 6 GHz, n =0,1,2, 3.
CaseB-30 kHz subcarrier spacing: the index of the first symbol of the candidate SSB is 4, 8, 16, 20 + 28 xn. For the case where the carrier frequency is less than or equal to 3 GHz, n = 0. For carrier frequencies greater than 3 GHz and less than or equal to 6 GHz, n =0, 1.
CaseC-30 kHz subcarrier spacing: the index of the first symbol of the candidate SSB is 2, 8 + 14 × n. For carrier frequencies less than or equal to 3 GHz, n =0, 1. For carrier frequencies greater than 3 GHz and less than or equal to 6 GHz, n =0,1,2, 3.
CaseD-120 kHz subcarrier spacing: the index of the first symbol of the candidate SSB is 4, 8, 16, 20 + 28 xn. For carrier frequencies greater than 6 GHz, n =0,1,2,3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.
CaseE-240 kHz subcarrier spacing: the index of the first symbol of the candidate SSB is {8, 12, 16, 20, 32, 36, 40, 44} + 56 x n. For the carrier frequency for 6 GHz, n =0,1,2,3, 5, 6, 7, 8.
It can be seen that when the subcarrier spacing SCS =30K, there are two modes of CaseB and C,
[0001]mode(s) [0002] <=3G [0003] 3G~6G
[0004] CaseB [0005] 4,8,16,20 [0006] 4,8,16,20,32,36,44,48
[0007] CaseC [0008] 2,8,16,22 [0009] 2,8,16,22,30,36,44,50
When the minimum 2 bits of the SSB index are 01 or 10, the actual position of symbol where the SSB is located is determined, and the frame header position can be obtained by reverse estimation.
When the lowest 2 bits of the SSB index are 00 or 11, there are two possibilities for the actual position of the symbol where the SSB is located, and further detection is needed to determine the position.
Disclosure of Invention
In view of the above problems, the present invention provides a method and an apparatus for determining an SSB start symbol pattern in cell search, and a storage medium, which can quickly obtain an actual SSB start symbol sequence number, simplify the process, and reduce the computational complexity.
The technical scheme is as follows: a method for determining SSB actual starting symbol in 5G cell search is characterized by comprising the following steps:
PSS sliding correlation search SSB within a set period,
capturing a certain amount of data of symbol at the position where SSB is searched by sliding correlation in the next set period,
decoding the SSB to obtain a cell ID, an SSB index and an MIB message;
the MIB message is subjected to a CRC check,
if the verification is correct, judging whether the lowest two bits of the SSB index are 00 or 11, otherwise, searching the SSB by the PSS sliding correlation in the set period again;
if the lowest two bits of the SSB index are 00 or 11, judging the SSB starting symbol mode respectively aiming at the condition that the lowest two bits of the SSB index are 00 or 11, confirming the SSB actual starting symbol sequence number according to the obtained SSB starting symbol mode, and then determining the position of the 10ms frame header according to the obtained SSB actual starting symbol sequence number; if not, directly starting the symbol sequence number by the SSB, and determining the position of the 10ms frame header.
Further, the capturing a certain amount of data of symbol in the next set period specifically includes: data of 4 symbols are captured at the position where SSB is searched for by sliding correlation in the next set period.
Further, if the two lowest bits of the SSB index are 00 or 11, determining the SSB start symbol pattern according to the two lowest bits of the SSB index being 00 or 11, including:
when the lowest two bits of the SSB index are 00, the position of 4 symbols of data is shifted backwards in the next set period, the 4 symbols of data are captured, PSS/SSS correlation is carried out on the captured data, a cell ID is obtained, whether the cell ID obtained by decoding the SSB is consistent with the obtained cell ID is judged, if yes, the SSB starting symbol mode is determined to be CaseB, the SSB actual starting symbol sequence number is determined according to CaseB, and the position of the 10ms frame header is determined according to the SSB actual starting symbol sequence number; if not, the positions of the data of 6 symbols are shifted backwards in the next set period, the data of 4 symbols are captured, PSS/SSS correlation is carried out on the captured data, a cell ID is obtained, whether the cell ID obtained by decoding SSB is consistent with the obtained cell ID is judged, if not, the steps are repeated until the obtained cell ID is consistent with the cell ID obtained by decoding SSB, if so, the SSB starting symbol mode is confirmed to be CaseC, the SSB actual starting symbol sequence number is confirmed according to CaseC, and the position of the frame head of 10ms is determined according to the SSB actual starting symbol sequence number.
Further, if the two lowest bits of the SSB index are 00 or 11, determining the SSB start symbol pattern according to the two lowest bits of the SSB index being 00 or 11, including:
when the lowest two bits of the SSB index are 11, shifting the positions of 4 symbols forward in the next set period, capturing the 4 symbols, carrying out PSS/SSS correlation on the captured data, acquiring a cell ID, judging whether the cell ID obtained by decoding the SSB is consistent with the acquired cell ID, if so, confirming that the SSB starting symbol mode is CaseB, confirming the SSB actual starting symbol sequence number according to CaseB, and confirming the position of the 10ms frame header by the SSB actual starting symbol sequence number; if not, shifting the positions of the data of 6 symbols forward in the next set period, capturing the data of 4 symbols, carrying out PSS/SSS correlation on the captured data, acquiring a cell ID, judging whether the cell ID obtained by decoding SSB is consistent with the acquired cell ID, if not, repeating the steps until the acquired cell ID is consistent with the cell ID obtained by decoding SSB, if so, confirming that the SSB starting symbol mode is CaseC, confirming the SSB actual starting symbol sequence number according to CaseC, and confirming the position of the frame head of 10ms according to the SSB actual starting symbol sequence number.
Further, the capturing a certain amount of data of symbol in the next set period specifically includes: in the next set period, the SSB searched by PSS sliding correlation is used as the center, and the data length of 6 symbols is extended forward and backward to capture the data of 16 symbols.
Further, if the two lowest bits of the SSB index are 00 or 11, determining the SSB start symbol pattern according to the two lowest bits of the SSB index being 00 or 11, including:
when the lowest two bits of the SSB index are 00, performing FFT (fast Fourier transform) on data with serial numbers of 10, 12 and 14 in 16 symbols, then performing PSS/SSS (Power System/satellite System) correlation to obtain cell IDs (IDs), confirming that an SSB starting symbol mode is CaseB if the cell IDs corresponding to the data with serial numbers of 10 and 12 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB starting symbol mode is CaseC if the cell IDs corresponding to the data with serial numbers of 12 and 14 are consistent with the cell ID obtained by decoding the SSB, confirming that an SSB actual starting symbol serial number is CaseC according to the confirmed SSB starting symbol mode, and confirming the position of the 10ms by the frame header SSB actual starting symbol serial number.
Further, if the two lowest bits of the SSB index are 00 or 11, determining the SSB start symbol pattern according to the two lowest bits of the SSB index being 00 or 11, including:
when the lowest two bits of the SSB index are 11, performing FFT (fast Fourier transform) on data with serial numbers of 0, 2 and 4 in 16 symbols, then performing PSS/SSS (Power System/satellite System) correlation to obtain a cell ID, if the cell IDs corresponding to the data with serial numbers of 0 and 2 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB starting symbol mode is CaseC, if the cell IDs corresponding to the data with serial numbers of 2 and 4 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB starting symbol mode is CaseB, confirming the SSB actual starting symbol serial number according to the confirmed SSB starting symbol mode, and confirming the position of 10ms by the frame header SSB actual starting symbol serial number.
Further, the setting period is 20 ms.
A computer apparatus comprising a memory and a processor, the memory storing a computer program, characterized in that: the processor, when executing the computer program, implements the method for determining the actual start symbol of the SSB in a 5G cell search as described above.
A computer-readable storage medium on which a program is stored, characterized in that: the program when executed by the processor implements a method for determining the actual start symbol of an SSB in a 5G cell search as described above.
The method for judging the SSB initial symbol mode in cell search comprises the steps of searching SSB through PSS sliding correlation in a set period, capturing a certain amount of data of symbol at the position where SSB is searched through PSS sliding correlation in the next set period, decoding the SSB, and obtaining cell ID, SSB index and MIB message; the MIB message is CRC checked and, for the case where the lowest two bits of the SSB index are not 00 or 11, directly starting the symbol sequence number by SSB, determining the position of the 10ms frame header, for the case where the lowest two bits for the SSB index are 00 or 11, the SSB start symbol pattern is determined, confirming the SSB actual starting symbol sequence number according to the obtained SSB starting symbol pattern, determining the position of the 10ms frame header according to the SSB actual starting symbol sequence number, it is possible to quickly determine which of the CaseB and CaseC the SSB start symbol pattern is when the subcarrier spacing SCS =30K, further determining the SSB actual starting symbol sequence number to obtain the position of the 10ms frame header, the shortest of which can be completed within 20ms of a default period, the efficiency is high, and when the detection confirms the SSB position, only the cell ID is compared, the SSB index is not calculated, the flow is simplified, and the calculation complexity is reduced.
Drawings
FIG. 1 is a schematic diagram of a time-frequency structure of an SSB;
fig. 2 is a flowchart of a method for determining an actual start symbol of an SSB in 5G cell search according to embodiment 1;
fig. 3 is a flowchart of a method for determining an actual start symbol of an SSB in 5G cell search according to embodiment 2;
FIG. 4 is a schematic diagram of data of 16 symbols captured in the method of embodiment 2;
FIG. 5 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
When the subcarrier spacing SCS =30K, there are two modes of CaseB and CaseC, and when the lowest 2 bits of the SSB index is 00 or 11, there are two possibilities that the actual position of symbol where the SSB is located may need to be determined by further detection, so the method for determining the actual start symbol of the SSB in 5G cell search is designed.
The invention discloses a method for judging SSB actual starting symbol in 5G cell search, which at least comprises the following steps:
PSS sliding correlation searches SSB in a set period, captures a certain amount of data of symbol at the position where SSB is searched in the next set period, decodes SSB, and obtains cell ID, SSB index and MIB message; performing CRC on the MIB message, if the check is correct, judging whether the lowest two bits of the SSB index are 00 or 11, otherwise, searching the SSB by PSS sliding correlation in the set period again; if the lowest two bits of the SSB index are 00 or 11, judging the SSB starting symbol mode respectively aiming at the condition that the lowest two bits of the SSB index are 00 or 11, confirming the SSB actual starting symbol sequence number according to the obtained SSB starting symbol mode, and then determining the position of the 10ms frame header according to the obtained SSB actual starting symbol sequence number; if not, the SSB actually starts the symbol sequence number directly, and the position of the 10ms frame header is determined, by adopting the method of the invention, when the subcarrier interval SCS =30K, the SSB starting symbol mode can be rapidly determined to be any one of CaseB and CaseC, and then the SSB actually starts the symbol sequence number, and the position of the 10ms frame header is obtained, the processing speed is high, and the efficiency is high.
Specific embodiments are given below to illustrate the process of the present invention.
Specific example 1: as shown in fig. 2, a method for determining the actual start symbol of the SSB in the 5G cell search according to the present invention searches the SSB through PSS sliding correlation in a period of 20ms,
capturing 4 symbols of data at the position where SSB is searched by sliding correlation in the next set period, wherein the data of 4 symbols is equal to the data length of one SSB,
decoding the SSB to obtain a cell ID, an SSB index and an MIB message;
the MIB message is subjected to a CRC check,
if the check is correct, judging whether the lowest two bits of the SSB index are 00 or 11, otherwise, sliding the related search SSB again in a period of 20 ms;
when the lowest two bits of the SSB index are 00, the position of 4 symbols of data is shifted backwards in the next 20ms period, the 4 symbols of data are captured, PSS/SSS correlation is carried out on the captured data, a cell ID is obtained, whether the cell ID obtained by decoding the SSB is consistent with the obtained cell ID is judged, if so, the SSB starting symbol mode is determined to be CaseB, the SSB actual starting symbol sequence number is determined according to CaseB, and the position of the 10ms frame header is determined according to the SSB actual starting symbol sequence number; if not, shifting the positions of the data of 6 symbols backwards in the next 20ms period, capturing the data of 4 symbols, carrying out PSS/SSS correlation on the captured data, acquiring a cell ID, judging whether the cell ID obtained by decoding SSB is consistent with the acquired cell ID, if not, repeating the steps until the acquired cell ID is consistent with the cell ID obtained by decoding SSB, if so, confirming that the SSB starting symbol mode is CaseC, confirming that the SSB actual starting symbol sequence number is CaseC according to CaseC, and confirming the position of the frame head of 10ms according to the SSB actual starting symbol sequence number;
when the lowest two bits of the SSB index are 11, shifting the positions of 4 symbols forward in the next 20ms period, capturing the 4 symbols, performing PSS/SSS correlation on the captured data, acquiring a cell ID, judging whether the cell ID obtained by decoding the SSB is consistent with the acquired cell ID, if so, confirming that the SSB starting symbol mode is CaseB, confirming the SSB actual starting symbol sequence number according to CaseB, and confirming the position of the 10ms frame header according to the SSB actual starting symbol sequence number; if not, shifting the positions of the data of 6 symbols forward in the next 20ms period, capturing the data of 4 symbols, carrying out PSS/SSS correlation on the captured data, acquiring a cell ID, judging whether the cell ID obtained by decoding SSB is consistent with the acquired cell ID, if not, repeating the steps until the acquired cell ID is consistent with the cell ID obtained by decoding SSB, if so, confirming that the SSB starting symbol pattern is CaseC, confirming that the SSB actual starting symbol sequence number is the CaseC, and confirming the position of the frame header of 10ms according to the SSB actual starting symbol sequence number.
In fig. 2, PCI (physical cell ID) is the cell ID, and PCI _ CaseB and PCI _ CaseC are the cell IDs obtained in association with the corresponding PSS/SSS.
In the method of this embodiment, the data length of 4 symbols and 6 symbols of each shift is set according to the position where the SSB exists, which is specified by the SSB start symbol patterns CaseB and CaseC, by the method in this embodiment, 3 cycles are required at most, 60ms is counted, i.e., CaseB or CaseC can be determined, after the SSB start symbol pattern is determined, the actual start symbol of the SSB can be obtained, the position of the 10ms frame header is determined, then the half-frame information in the MIB is obtained by demodulating PBCH, the actual 10ms frame header can be determined, and the 10ms frame synchronization is completed.
Specific example 2: as shown in fig. 3, a method for determining the actual start symbol of the SSB in the 5G cell search according to the present invention, slides the correlation search SSB within a period of 20ms,
in the next 20ms period, with the SSB searched by PSS sliding correlation as the center, the data length of 6 symbols is extended forward and backward, and the data of 16 symbols is captured, as shown in fig. 4;
decoding the SSB to obtain a cell ID, an SSB index and an MIB message;
the MIB message is subjected to a CRC check,
if the check is correct, judging whether the lowest two bits of the SSB index are 00 or 11, otherwise, sliding the related search SSB again in a period of 20 ms;
when the lowest two bits of the SSB index are 00, numbering the data of 16 symbols from 0 to 15, performing FFT on the data with the serial numbers of 10, 12 and 14 in the 16 symbols, then, performing PSS/SSS correlation to obtain a cell ID, and only if the cell ID is a true SSB, obtaining the same cell ID as the original SSB, where the serial number 10 may be the PSS of the first SSB, the serial number 12 may be the SSS of the first SSB or the PSS of the second SSB, the serial number 14 may be the SSS of the second SSB, and if the cell IDs corresponding to the data with the serial numbers 10 and 12 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB initial symbol pattern is CaseB, if the cell IDs corresponding to the data with the serial numbers 12 and 14 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB initial symbol pattern is CaseC, and confirming the SSB actual starting symbol sequence number according to the determined SSB starting symbol mode, and determining the position of the 10ms frame header according to the SSB actual starting symbol sequence number.
When the lowest two bits of the SSB index are 11, performing FFT transformation on data with sequence numbers 0, 2, and 4 in 16 symbols, and then performing PSS/SSS correlation to obtain a cell ID, where sequence number 0 may be PSS of a first SSB, sequence number 2 may be SSS of the first SSB or PSS of a second SSB, and sequence number 4 may be SSS of the second SSB, and as in the above, if the cell IDs corresponding to the data with sequence numbers 0 and 2 are consistent with the cell ID obtained by decoding the SSB, the SSB start symbol pattern is determined to be CaseC, and if the cell IDs corresponding to the data with sequence numbers 2 and 4 are consistent with the cell ID obtained by decoding the SSB, the SSB start symbol pattern is determined to be CaseB, the SSB actual start symbol sequence number is determined according to the determined SSB start symbol pattern, and the SSB actual start symbol sequence number determines the position of the frame header of 10 ms.
In fig. 3, PCI (physical cell ID) is the cell ID, and PCI _ CaseB and PCI _ CaseC are the cell IDs obtained in association with the corresponding PSS/SSS.
In this embodiment, data of 16 symbols are captured in one cycle, and the reason for capturing data is to determine CaseB/C in one cycle. Before the middle SSB process, it cannot be determined whether to grab more data ahead or behind, and only a few more grabs. Pick 6 because at most 6 symbols are advanced or delayed, by using the method of this embodiment, inThe result is obtained with a default period of 20ms, and only the comparison is made when the SSB position is detected and confirmed
Figure 427207DEST_PATH_IMAGE006
(PCI), SSB index is not calculated any more, flow is simplified, in addition, only 3 symbols are calculated in FFT, the middle symbol can be reused, 2 of sequence numbers 0, 2 and 4 of 16 symbols, 12 of 2, 10, 12 and 14, the two symbols may be PSS or SSS, and one FFT result can be repeated twice.
In an embodiment of the present invention, there is further provided a computer apparatus, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the method for determining an actual start symbol of an SSB in a 5G cell search when executing the computer program.
The computer apparatus may be a terminal, and its internal structure diagram may be as shown in fig. 5. The computer device comprises a processor, a memory, a network interface, a display screen and an input device which are connected through a bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile 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 an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a method for determining the actual start symbol of an SSB in a 5G cell search. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on a shell of the computer device, an external keyboard, a touch pad or a mouse and the like.
The Memory may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory is used for storing programs, and the processor executes the programs after receiving the execution instructions.
The processor may be an integrated circuit chip having signal processing capabilities. The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like. The Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Those skilled in the art will appreciate that the configuration shown in fig. 5 is a block diagram of only a portion of the configuration associated with the present application and is not intended to limit the computing device to which the present application may be applied, and that a particular computing device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In an embodiment of the present invention, there is also provided a computer-readable storage medium, on which a program is stored, which when executed by a processor, implements a method for determining an actual start symbol of an SSB in a 5G cell search as described above.
As will be appreciated by one of skill in the art, embodiments of the present invention may be provided as a method, computer apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, computer apparatus, or computer program products according to embodiments of the invention. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart and/or flowchart block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart.
The present invention provides a method for determining the actual start symbol of the SSB in the 5G cell search, a computer device, and an application of a computer readable storage medium, which are described in detail above, wherein a specific example is applied to illustrate the principle and the implementation of the present invention, and the above description of the embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (6)

1. A method for determining SSB actual starting symbol in 5G cell search is characterized by comprising the following steps:
PSS sliding correlation search SSB within a set period,
capturing 4 symbols of data at the position where SSB is searched in a sliding correlation manner in the next set period, decoding the SSB, and acquiring a cell ID, an SSB index and an MIB message;
the MIB message is subjected to a CRC check,
if the check is correct, judging whether the lowest two bits of the SSB index are 00 or 11, otherwise, searching the SSB by the PSS sliding correlation in the set period again,
if the two lowest bits of the SSB index are 00 or 11, determining the SSB start symbol pattern for the case where the two lowest bits of the SSB index are 00 or 11, respectively, including:
when the lowest two bits of the SSB index are 00, the position of 4 symbols of data is shifted backwards in the next set period, the 4 symbols of data are captured, PSS/SSS correlation is carried out on the captured data, a cell ID is obtained, whether the cell ID obtained by decoding the SSB is consistent with the obtained cell ID is judged, if yes, the SSB starting symbol mode is determined to be CaseB, the SSB actual starting symbol sequence number is determined according to CaseB, and the position of the 10ms frame header is determined according to the SSB actual starting symbol sequence number; if not, shifting the positions of the data of 6 symbols backwards in the next set period, capturing the data of 4 symbols, carrying out PSS/SSS correlation on the captured data, acquiring a cell ID, judging whether the cell ID obtained by decoding SSB is consistent with the acquired cell ID, if not, repeating the steps until the acquired cell ID is consistent with the cell ID obtained by decoding SSB, if so, confirming that the SSB starting symbol mode is CaseC, confirming the SSB actual starting symbol sequence number according to CaseC, and confirming the position of the frame header of 10ms according to the SSB actual starting symbol sequence number;
when the lowest two bits of the SSB index are 11, shifting the positions of 4 symbols forward in the next set period, capturing the 4 symbols, carrying out PSS/SSS correlation on the captured data, acquiring a cell ID, judging whether the cell ID obtained by decoding the SSB is consistent with the acquired cell ID, if so, confirming that the SSB starting symbol mode is CaseB, confirming the SSB actual starting symbol sequence number according to CaseB, and confirming the position of the 10ms frame header by the SSB actual starting symbol sequence number; if not, shifting the positions of the data of 6 symbols forward in the next set period, capturing the data of 4 symbols, carrying out PSS/SSS correlation on the captured data, acquiring a cell ID, judging whether the cell ID obtained by decoding SSB is consistent with the acquired cell ID, if not, repeating the steps until the acquired cell ID is consistent with the cell ID obtained by decoding SSB, if so, confirming that the SSB starting symbol mode is CaseC, confirming the SSB actual starting symbol sequence number according to CaseC, and confirming the position of the frame head of 10ms according to the SSB actual starting symbol sequence number.
2. The method of claim 1, wherein the method for determining the actual start symbol of the SSB in 5G cell search comprises: the set period is 20 ms.
3. A method for determining SSB actual starting symbol in 5G cell search is characterized by comprising the following steps:
PSS sliding correlation search SSB within a set period,
in the next set period, with SSB searched by PSS sliding correlation as the center, expanding the data length of 6 symbols forwards and backwards, capturing the data of 16 symbols, decoding SSB, and acquiring cell ID, SSB index and MIB message;
the MIB message is subjected to a CRC check,
if the check is correct, judging whether the lowest two bits of the SSB index are 00 or 11, otherwise, searching the SSB by the PSS sliding correlation in the set period again,
if the two lowest bits of the SSB index are 00 or 11, determining the SSB start symbol pattern for the case where the two lowest bits of the SSB index are 00 or 11, respectively, including:
when the lowest two bits of the SSB index are 00, performing FFT (fast Fourier transform) on data with serial numbers of 10, 12 and 14 in 16 symbols, then performing PSS/SSS (Power System/satellite System) correlation to obtain a cell ID, if the cell IDs corresponding to the data with serial numbers of 10 and 12 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB starting symbol mode is CaseB, if the cell IDs corresponding to the data with serial numbers of 12 and 14 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB starting symbol mode is CaseC, confirming the SSB actual starting symbol serial number according to the confirmed SSB starting symbol mode, and confirming the position of 10ms by the frame header SSB actual starting symbol serial number;
when the lowest two bits of the SSB index are 11, performing FFT (fast Fourier transform) on data with serial numbers of 0, 2 and 4 in 16 symbols, then performing PSS/SSS (Power System/satellite System) correlation to obtain a cell ID, if the cell IDs corresponding to the data with serial numbers of 0 and 2 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB starting symbol mode is CaseC, if the cell IDs corresponding to the data with serial numbers of 2 and 4 are consistent with the cell ID obtained by decoding the SSB, confirming that the SSB starting symbol mode is CaseB, confirming the SSB actual starting symbol serial number according to the confirmed SSB starting symbol mode, and confirming the position of 10ms by the frame header SSB actual starting symbol serial number.
4. The method of claim 3, wherein the method for determining the actual start symbol of the SSB in 5G cell search comprises: the set period is 20 ms.
5. A computer apparatus comprising a memory and a processor, the memory storing a computer program, characterized in that: the processor, when executing the computer program, implements a method of determining the actual start symbol of an SSB in a 5G cell search according to claim 1 or claim 3.
6. A computer-readable storage medium on which a program is stored, characterized in that: the program when executed by a processor implements a method of determining the actual start symbol of an SSB in a 5G cell search as claimed in claim 1 or claim 3.
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