CN112019301B - PBCH (physical broadcast channel) detection method and terminal - Google Patents
PBCH (physical broadcast channel) detection method and terminal Download PDFInfo
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Abstract
The invention discloses a PBCH channel detection method, which comprises the following steps: receiving SSB signals, and analyzing PSS signals and SSS signals in the SSB signals to obtain a cell identifier; extracting PBCH and DMRS signals from the SSB signals according to the time-frequency domain resource position of the SSB; carrying out normalization processing on the DMRS signals to obtain a first DMRS sequence; obtaining a local DMRS sequence according to the first preset value and the cell identifier; performing cross-correlation processing on the local DMRS sequence and the first DMRS sequence to obtain a related first peak value and a related second peak value; when the correlation first peak value and the correlation second peak value are judged not to meet the analysis condition, updating the first preset value, and judging whether the analysis condition is met again, and analyzing the PBCH signal until the analysis condition is met; the technical scheme can effectively shorten the analysis time of the PBCH and improve the synchronization efficiency of the terminal and the base station.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a PBCH channel detection method and a terminal.
Background
In mobile communication, after a mobile phone terminal is started, cell search is firstly carried out to enable the terminal and a base station to complete synchronization in a time-frequency domain, a cell ID is obtained by analyzing a PSS and an SSS, and then other information communication can be carried out. In the 5G NR, a primary synchronization signal PSS, a secondary synchronization signal SSS, and a broadcast signal PBCH jointly form a synchronization signal block SSB, and different numbers of SSBs may be transmitted according to different channel qualities, so as to improve synchronization efficiency. For the PBCH parsing method, the general method is to sequentially traverse and parse the PBCH location information in each SSB block until the PBCH parsing is successful or all traversal is completed. However, due to the correlation of the DMRS carried by the PBCH, the result of analyzing the PBCH is significant if the correlation is large; however, in the prior art, correlation factors of DMRSs are not considered in the process of analyzing PBCH, and the analysis time of PBCH is increased in the process of sequentially traversing and analyzing PBCH position information in each SSB block, so that the synchronization efficiency between the terminal and the base station is low.
Therefore, there is a need in the market for a PBCH channel detection method that can effectively shorten the PBCH parsing time and improve the synchronization efficiency between the terminal and the base station.
Disclosure of Invention
The invention provides a PBCH channel detection method, which can effectively shorten the analysis time of PBCH and improve the synchronization efficiency of a terminal and a base station.
In order to solve the above technical problem, an embodiment of the present invention provides a method for detecting a PBCH channel, including:
receiving SSB signals, and analyzing PSS signals and SSS signals in the SSB signals to obtain a cell identifier;
extracting PBCH signals and DMRS signals from the SSB signals according to the time-frequency domain resource positions of the SSB signals;
normalizing the DMRS signals to obtain a first DMRS sequence; obtaining a local DMRS sequence according to a first preset value and the cell identifier;
performing cross-correlation processing on the local DMRS sequence and the first DMRS sequence to obtain a related first peak value and a related second peak value;
and judging whether an analysis condition is met or not according to the correlation first peak value and the correlation second peak value, updating the first preset value when the analysis condition is not met, calculating a new local DMRS sequence, and judging whether the analysis condition is met or not again until the PBCH signal is analyzed when the analysis condition is determined to be met.
As a preferred scheme, before the updating the first preset value, the method further includes:
judging the first preset value, and stopping updating and finishing PBCH detection when the first preset value is determined to reach a numbering parameter value;
wherein the number parameter value is calculated by the number of the half frame where the PBCH signal is located and the indication number of the SSB signal.
Preferably, the analyzing the PBCH signal includes:
analyzing the PBCH signal to obtain CRC (cyclic redundancy check) information and judging whether the CRC information is wrong or not; when the CRC information is determined to be wrong, judging whether the first preset value reaches a numbering parameter value;
when the first preset value does not reach the numbering parameter value, updating the first preset value until the CRC check information is determined to be correct; otherwise, stopping updating and finishing PBCH detection.
As a preferred scheme, in the step of obtaining the local DMRS sequence according to the first preset value and the cell identifier, the step specifically includes:
generating an initialization seed of a pseudorandom sequence according to a first preset value and the cell identifier;
and generating a local DMRS sequence according to the initialization seed of the pseudo-random sequence.
Preferably, the analysis conditions are: (P) top1 -P top2 )/P top1 >0.1；
Wherein, P top1 To correlate the first peak, P top2 Is the correlation second peak.
Accordingly, another embodiment of the present invention provides a PBCH channel detecting terminal, including:
a signal receiving unit, configured to receive an SSB signal, and analyze a PSS signal and an SSS signal in the SSB signal to obtain a cell identifier;
a signal extraction unit, configured to extract a PBCH signal and a DMRS signal from the SSB signal according to a time-frequency domain resource location of the SSB signal;
the sequence processing unit is used for carrying out normalization processing on the DMRS signals to obtain a first DMRS sequence; obtaining a local DMRS sequence according to a first preset value and the cell identifier;
a peak processing unit, configured to perform cross-correlation processing on the local DMRS sequence and the first DMRS sequence to obtain a first relevant peak and a second relevant peak;
and the analysis judging unit is used for judging whether an analysis condition is met or not according to the correlation first peak value and the correlation second peak value, updating the first preset value when the analysis condition is not met, calculating a new local DMRS sequence and judging whether the analysis condition is met or not again until the analysis condition is determined to be met, and analyzing the PBCH signal.
As a preferred scheme, before the updating the first preset value, the method further includes:
judging the first preset value, and when the first preset value reaches a numbering parameter value, stopping updating and finishing PBCH detection;
wherein the number parameter value is calculated by the number of the half frame where the PBCH signal is located and the indication number of the SSB signal.
As a preferred embodiment, the analyzing the PBCH signal specifically includes:
analyzing the PBCH signal to obtain CRC (cyclic redundancy check) information and judging whether the CRC information is wrong or not; when the CRC information is determined to be wrong, judging whether the first preset value reaches a numbering parameter value;
when the first preset value is determined not to reach the numbering parameter value, updating the first preset value until the CRC check information is determined to be correct; otherwise, stopping updating and finishing PBCH detection.
As a preferred scheme, in the step of obtaining the local DMRS sequence according to the first preset value and the cell identifier, the step specifically includes:
generating an initialization seed of a pseudorandom sequence according to a first preset value and the cell identifier;
and generating a local DMRS sequence according to the initialization seed of the pseudo-random sequence.
Preferably, the analysis conditions are: (P) top1 -P top2 )/P top1 >0.1；
Wherein, P top1 To correlate the first peak, P top2 Is the correlation second peak.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the technical scheme of the invention carries out PBCH analysis when judging that the analysis condition is met by checking the correlation of the DMRS carried by the PBCH, otherwise, skipping, thus reducing the analysis times of the PBCH, effectively shortening the analysis time of the PBCH and improving the synchronization efficiency of the terminal and the base station.
Drawings
FIG. 1: the invention provides a schematic flow chart of a PBCH channel detection method;
FIG. 2 is a schematic diagram: is a time-frequency domain resource location distribution diagram of the SSB signal in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a schematic flow chart of a PBCH channel detection method according to an embodiment of the present invention is shown, where the PBCH channel detection method includes steps 101 to 105, and the steps are as follows:
step 101, receiving an SSB signal, and analyzing a PSS signal and an SSS signal in the SSB signal to obtain a cell identifier.
Specifically, as shown in fig. 2, it is a time-frequency domain resource location distribution diagram of the SSB signal in the embodiment of the present invention. The distribution of PSS, SSS, PBCH and DMRS in the figure can be seen. PSS on the first symbol of the SSB block, SSS on the third symbol of the SSB block, PBCH filling the second and fourth symbols and a part on the third symbol, where PBCH has three DMRSs on each RB in the frequency domain and four possible optional positions, whose position calculation is given by the following formula;
wherein
For the cell identifier, v may take the value 0,1,2,3, obtained by parsing the PSS and SSS.
And 102, extracting a PBCH signal and a DMRS signal from the SSB signal according to the time-frequency domain resource position of the SSB signal.
103, performing normalization processing on the DMRS signals to obtain a first DMRS sequence; and obtaining a local DMRS sequence according to the first preset value and the cell identifier. In this embodiment, the step of calculating the local DMRS sequence specifically includes: generating an initialization seed of a pseudorandom sequence according to a first preset value and the cell identifier; and generating a local DMRS sequence according to the initialization seed of the pseudo-random sequence.
Specifically, normalization limits all data to a range of 0 to 1, in order to facilitate processing of the data. The first preset value is initialization
In the present embodiment, for a first assignment, on>
The value of (2) is assigned 0. The generation formula of the local DMRS sequence is as follows:
wherein the initialization seed c of the pseudo-random sequence c (m) init Generating required parameters
Initialization is performed. Initialization seed c init The calculation formula of (a) is as follows: />
Wherein
n hf Is the number of the PBCH field, i SSB Is an indication number of the SSB block. i.e. i SSB Value of and L max Related, L max =4, 8,64, L when the carrier frequency domain f ≦ 3GHz max =4, when = live->
The value ranges from 0,1,2,3,4,5,6,7; when the carrier frequency domain is more than or equal to 3GHz and less than or equal to 6GHz, L max =8, when =>
The value ranges from 0,1,2,3,4,5,6,7; when the carrier frequency domain f is more than or equal to 6GHz, L max =64, when +>
The value range is 0,1, \ 8230;, 63. And sequentially generating a DMRS sequence at a receiving end according to the characteristics to perform cross correlation with the received DMRS signal, jumping out and traversing to perform PBCH analysis if the correlation is larger, and continuously traversing the next parameter if the correlation is smaller until all candidate values are traversed. The method firstly tests the correlation of the DMRS, if the correlation is larger, PBCH analysis is carried out, otherwise, the PBCH analysis is skipped over, thereby reducing the analysis times of the PBCH and effectively shortening the analysis time of the PBCH.
And 104, performing cross-correlation processing on the local DMRS sequence and the first DMRS sequence to obtain a related first peak value and a related second peak value.
In particular according to what is carried out in the steps described aboveAccording to the parameters
And &>
Get corresponding c init And then, generating a local DMRS according to c (m), extracting the DMRS from the received PBCH information, and performing cross-correlation processing on the DMRS and the PBCH information. The cross-correlation is to perform conjugate multiplication on two groups of data, so as to determine the correlation magnitude of the two groups of data.
And 105, judging whether an analysis condition is met or not according to the correlation first peak value and the correlation second peak value, updating the first preset value when the analysis condition is not met, calculating a new local DMRS sequence, and judging whether the analysis condition is met or not again until the PBCH signal is analyzed when the analysis condition is determined to be met. In this embodiment, before the updating the first preset value in step 105, the method further includes: judging the first preset value, and when the first preset value is determined to reach the numbering parameter value
When the PBCH detection is finished, stopping updating; wherein the numbering parameter value->
And calculating the number of the half frame where the PBCH signal is located and the indication number of the SSB signal.
Specifically, it is determined whether the first peak and the second peak of the correlation of the two sequences satisfy (P) top1 -P top2 )/P top1 >0.1 wherein P top1 Represents the first peak, P top2 Representing the second peak value, if the second peak value is satisfied, analyzing the PBCH in the next step, and if the second peak value is not satisfied, judging again
Whether all traversals are performed or not, and if not, updating->
And continuing to execute step 103, and if all the traversals are performed, terminating the PBCH detection. The correlation can be more accurately judged by calculating the difference value of the two peak values, and the situation that the correlation is strong when more correlation points pass through a threshold value due to overlarge noise is avoided.
In the step of analyzing the PBCH signal, analyzing the PBCH signal to obtain CRC (cyclic redundancy check) information and judging whether the CRC information is wrong; when the CRC information is determined to be wrong, judging whether the first preset value reaches a numbering parameter value; when the first preset value does not reach the numbering parameter value, updating the first preset value until the CRC check information is determined to be correct; otherwise, stopping updating and finishing PBCH detection.
Specifically, PBCH information is analyzed, through channel estimation and equalization, demodulation descrambling decoding is carried out, whether CRC (cyclic redundancy check) of check information is correct or not is judged finally, if the CRC is correct, PBCH analysis is correct, PBCH retrieval is ended, and if the CRC is wrong, judgment is carried out again
Whether all traversals are performed or not, and if not, updating->
And continuing to execute step 103, and if all traversal is performed, ending PBCH detection.
Example two
Accordingly, another embodiment of the present invention provides a PBCH channel detecting terminal, including:
and the signal receiving unit is used for receiving the SSB signals, and analyzing the PSS signals and the SSS signals in the SSB signals to obtain the cell identifier.
And a signal extraction unit, configured to extract the PBCH signal and the DMRS signal from the SSB signal according to the time-frequency domain resource location of the SSB signal.
The sequence processing unit is used for carrying out normalization processing on the DMRS signals to obtain a first DMRS sequence; obtaining a local DMRS sequence according to a first preset value and the cell identifier; in this embodiment, the step of obtaining the local DMRS sequence according to the first preset value and the cell identifier specifically includes: generating an initialization seed of a pseudorandom sequence according to a first preset value and the cell identifier; and generating a local DMRS sequence according to the initialization seed of the pseudo-random sequence.
And the peak value processing unit is used for performing cross-correlation processing on the local DMRS sequence and the first DMRS sequence to obtain a related first peak value and a related second peak value.
And the analysis judging unit is used for judging whether an analysis condition is met or not according to the correlation first peak value and the correlation second peak value, updating the first preset value when the analysis condition is not met, calculating a new local DMRS sequence and judging whether the analysis condition is met or not again until the analysis condition is determined to be met, and analyzing the PBCH signal. In this embodiment, the analysis conditions are: (P) top1 -P top2 )/P top1 >0.1; wherein, P top1 To correlate the first peak, P top2 Is the correlation second peak.
In this embodiment, before the updating the first preset value, the method further includes: judging the first preset value, and when the first preset value reaches a numbering parameter value, stopping updating and finishing PBCH detection; wherein the number parameter value is calculated by the number of the half frame where the PBCH signal is located and the indication number of the SSB signal.
In this embodiment, the analyzing the PBCH signal specifically includes:
analyzing the PBCH signal to obtain CRC (cyclic redundancy check) information and judging whether the CRC information is wrong or not; when the CRC information is determined to be wrong, judging whether the first preset value reaches a numbering parameter value;
when the first preset value is determined not to reach the numbering parameter value, updating the first preset value until the CRC check information is determined to be correct; otherwise, stopping updating and finishing PBCH detection.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (8)
1. A method for detecting PBCH (physical broadcast channel), comprising the following steps:
receiving SSB signals, and analyzing PSS signals and SSS signals in the SSB signals to obtain a cell identifier;
extracting PBCH signals and DMRS signals from the SSB signals according to the time-frequency domain resource positions of the SSB signals;
carrying out normalization processing on the DMRS signals to obtain a first DMRS sequence; obtaining a local DMRS sequence according to a first preset value and the cell identifier; the first preset value is initialization
A value of, wherein->
Calculating according to the number of the half frame where the PBCH signal is located and the indication number of the SSB signal;
performing cross-correlation processing on the local DMRS sequence and the first DMRS sequence to obtain a related first peak value and a related second peak value;
judging whether an analysis condition is met or not according to the related first peak value and the related second peak value, updating the first preset value when the analysis condition is not met, calculating a new local DMRS sequence, and judging whether the analysis condition is met or not again until the PBCH signal is analyzed when the analysis condition is determined to be met; wherein the analysis conditions are as follows: (P) top1 -P top2 )/P top1 >0.1; wherein, P top1 To correlate the first peak, P top2 Is the correlation second peak.
2. The method of detecting PBCH channel of claim 1, wherein before said updating said first preset value, further comprising:
judging the first preset value, and stopping updating and finishing PBCH detection when the first preset value is determined to reach a numbering parameter value;
and the number parameter value is calculated by the number of the half frame where the PBCH signal is located and the indication number of the SSB signal.
3. The method for detecting PBCH channel of claim 2, wherein said step of analyzing said PBCH signal comprises:
analyzing the PBCH signal to obtain CRC check information and judging whether the CRC check information is wrong or not; when the CRC information is determined to be wrong, judging whether the first preset value reaches a numbering parameter value;
when the first preset value is determined not to reach the numbering parameter value, updating the first preset value until the CRC check information is determined to be correct; otherwise, stopping updating and finishing PBCH detection.
4. The method for detecting a PBCH channel according to claim 1, wherein the step of obtaining the local DMRS sequence according to the first preset value and the cell identifier specifically comprises:
generating an initialization seed of a pseudorandom sequence according to a first preset value and the cell identifier;
and generating a local DMRS sequence according to the initialization seed of the pseudo-random sequence.
5. A PBCH channel sensing terminal, comprising:
a signal receiving unit, configured to receive an SSB signal, and analyze a PSS signal and an SSS signal in the SSB signal to obtain a cell identifier;
a signal extraction unit, configured to extract a PBCH signal and a DMRS signal from the SSB signal according to a time-frequency domain resource location of the SSB signal;
the sequence processing unit is used for carrying out normalization processing on the DMRS signals to obtain a first DMRS sequence; and obtaining a local DMRS sequence according to a first preset value and the cell identifier; the first preset value refers to initialization
A value of (1), wherein
According to the number of the half frame where the PBCH signal is positioned and the indication number of the SSB signal
A peak processing unit, configured to perform cross-correlation processing on the local DMRS sequence and the first DMRS sequence to obtain a related first peak and a related second peak;
an analysis judging unit, configured to judge whether an analysis condition is satisfied according to the relevant first peak value and the relevant second peak value, update the first preset value when the analysis condition is not satisfied, calculate a new local DMRS sequence, and judge whether the analysis condition is satisfied again until it is determined that the analysis condition is satisfied, and analyze the PBCH signal; wherein the analysis conditions are as follows: (P) top1 -P top2 )/P top1 >0.1; wherein, P top1 To correlate the first peak, P top2 Is the correlation second peak.
6. The PBCH channel sensing terminal of claim 5, wherein before said updating said first preset value, further comprising:
judging the first preset value, and when the first preset value reaches a numbering parameter value, stopping updating and finishing PBCH detection;
and the number parameter value is calculated by the number of the half frame where the PBCH signal is located and the indication number of the SSB signal.
7. The PBCH channel detecting terminal of claim 6, wherein said step of analyzing the PBCH signal specifically comprises:
analyzing the PBCH signal to obtain CRC (cyclic redundancy check) information and judging whether the CRC information is wrong or not; when the CRC information is determined to be wrong, judging whether the first preset value reaches a numbering parameter value;
when the first preset value is determined not to reach the numbering parameter value, updating the first preset value until the CRC check information is determined to be correct; otherwise, stopping updating and finishing PBCH detection.
8. The PBCH channel detecting terminal of claim 5, wherein the step of obtaining the local DMRS sequence according to the first preset value and the cell identifier specifically includes:
generating an initialization seed of a pseudorandom sequence according to a first preset value and the cell identifier;
and generating a local DMRS sequence according to the initialization seed of the pseudo-random sequence.
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