CN113422666B - Cell search pre-access method for narrowband Internet of things terminal and narrowband Internet of things terminal - Google Patents
Cell search pre-access method for narrowband Internet of things terminal and narrowband Internet of things terminal Download PDFInfo
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- H—ELECTRICITY
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- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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- G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
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- G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
- G16Y40/00—IoT characterised by the purpose of the information processing
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- H04J11/0079—Acquisition of downlink reference signals, e.g. detection of cell-ID
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The application discloses a cell search pre-access method of a terminal of a narrowband Internet of things and the terminal of the narrowband Internet of things, wherein the method comprises the following steps: acquiring pre-accessed cell data comprising a plurality of continuous subframe signals; performing correlation operation on the pre-accessed cell data and local pre-stored data to generate initial processing data of the pre-accessed cell; processing the initial processing data of the pre-accessed cell by adopting a peak point energy value extraction model to generate final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell; matching final processing data of the energy values of the wave peak points with local preset reference signal receiving power data; and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, confirming that the cell search pre-access is successful.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a method for pre-accessing a narrowband internet of things terminal cell search in a mobile communications system and a narrowband internet of things terminal.
Background
With the advent of the big data age, wireless communication will enable everything connection. Many wireless connections between things have emerged at present, most of these connections being achieved through bluetooth, wifi, narrowband internet of things, etc. The narrowband internet of things is constructed in a cellular network, coexists with the existing network, can be directly deployed in a GSM network, a UMTS network and an LTE network, reduces the deployment cost and realizes smooth upgrading.
In implementing the prior art, the inventors found that:
when the terminal of the narrowband internet of things reselects a cell or the terminal enters a dormant state or is connected again in a power-off state, the base station can issue appointed cell information for the terminal of the narrowband internet of things to access, the terminal of the narrowband internet of things does not access until each piece of cell information is searched in the access process, if the terminal of the narrowband internet of things does not need to access a cell, the terminal of the narrowband internet of things can search for a new cell again to access until the terminal of the narrowband internet of things is refused, and therefore the efficiency of accessing the cell information of the terminal of the narrowband internet of things is low.
Therefore, a technical scheme capable of quickly accessing to the cell search of the terminal of the narrowband internet of things needs to be provided.
Disclosure of Invention
The embodiment of the application provides a technical scheme for fast access of a narrowband Internet of things terminal cell search, which is used for solving the problem of low access efficiency of the narrowband Internet of things terminal cell search.
Specifically, a method for searching and pre-accessing a terminal cell of a narrowband internet of things comprises the following steps:
acquiring pre-accessed cell data comprising a plurality of continuous subframe signals;
performing correlation operation on the pre-accessed cell data and local pre-stored data to generate initial processing data of the pre-accessed cell;
processing the initial processing data of the pre-accessed cell by adopting a peak point energy value extraction model to generate final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell;
matching final processing data of the energy values of the wave peak points with local preset reference signal receiving power data;
and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, confirming that the cell search pre-access is successful.
Further, the initial processing data of the pre-access cell is processed by adopting a peak point energy value extraction model, and final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-access cell is generated, which specifically comprises:
extracting data of a plurality of wave peak points in initial processing data of a pre-access cell;
calculating the peak energy value of the data of the plurality of peak points;
final processing data of energy values of a plurality of peak points extracted from pre-access cell initial processing data is generated.
Further, the extracting the data of a plurality of peak points in the initial processing data of the pre-access cell specifically includes:
extracting peak points meeting the peak-to-average ratio greater than a K value from initial processing data of a pre-access cell;
wherein the peak-to-average ratio K value is not lower than 5.
Further, the calculating the peak energy value of the data of the plurality of peak points specifically includes:
and calculating the peak energy value of the data of the plurality of peak points by adopting a peak energy algorithm.
Further, when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, confirming that the cell search pre-access is successful, specifically comprising:
and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, confirming that the cell searching pre-access is successful.
The embodiment of the application also provides a terminal of the narrowband internet of things, which comprises:
an acquisition module, configured to acquire pre-accessed cell data including a plurality of continuous subframe signals;
the first processing module is used for carrying out correlation operation on the pre-accessed cell data and local pre-stored data to generate initial processing data of the pre-accessed cell;
the second processing module is used for processing the initial processing data of the pre-accessed cell by adopting a peak point energy value extraction model to generate final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell;
the matching module is used for matching the final processing data of the energy values of the wave peak points with the local preset reference signal receiving power data;
and the output module is used for confirming that the cell search pre-access is successful when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data.
Further, the second processing module is configured to process the initial processing data of the pre-accessed cell by using a peak point energy value extraction model, and generate final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell, and specifically includes:
extracting data of a plurality of wave peak points in initial processing data of a pre-access cell;
calculating the peak energy value of the data of the plurality of peak points;
final processing data of energy values of a plurality of peak points extracted from pre-access cell initial processing data is generated.
Further, the extracting the data of a plurality of peak points in the initial processing data of the pre-access cell specifically includes:
extracting peak points meeting the peak-to-average ratio greater than a K value from initial processing data of a pre-access cell;
wherein the peak-to-average ratio K value is not lower than 5.
Further, the calculating the peak energy value of the data of the plurality of peak points specifically includes:
and calculating the peak energy value of the data of a plurality of peak points by adopting a peak energy algorithm.
Further, the output module is configured to confirm that the cell search pre-access is successful when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, and specifically includes:
and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, confirming that the cell searching pre-access is successful.
The technical scheme provided by the embodiment of the application has at least the following beneficial effects:
the cell search pre-access scheme of the narrowband internet of things terminal provided by the embodiment of the application can perform cell search and quick pre-access on the premise that the narrowband internet of things terminal knows the cell information to be accessed. On the premise of successful pre-access, the method can correct the frequency offset time offset, detect the cell ID number and the cell ID number of the pre-access, and further realize the rapid access of the terminal of the narrowband Internet of things to the designated cell.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a flowchart of a method for searching and pre-accessing a terminal cell of a narrowband internet of things according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a narrowband internet of things terminal according to an embodiment of the present application.
Narrowband internet of things terminal 100
Acquisition module 11
First processing module 12
The second processing module 13
Matching module 14
Output module 15
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The existing narrowband internet of things technology is widely applied to various fields of cities, such as intelligent water meters, intelligent parking, household appliance management, mobile payment and the like. The narrowband internet of things technology increases the signal gain by 20dB compared to the general packet radio service technology (General Packet Radio Service). The narrowband internet of things technology supports low delay sensitivity and ultra-low equipment cost, does not need to re-establish a network, and highlights the substantial advantages in different fields. In the existing narrowband internet of things technology, in the process of cell reselection, a base station can issue appointed cell information for a narrowband internet of things terminal to access. And in the access process, the narrowband internet of things terminal does not access every time when searching for one cell information, and if the narrowband internet of things terminal is not a cell to be accessed, a new cell is not searched again for access until the base station is refused. The access method causes the long time of the network access process and unpredictable access probability, thereby causing the network access efficiency to be low. How to change the reduction of the time for the narrowband internet of things terminal to complete the network access and the improvement of the probability of the access network is the problem to be solved by the technical scheme of the application.
As will be appreciated by those skilled in the art, NB-IOT (Narrow Band Internet Of Things) represents a narrowband internet of things terminal. The narrowband internet of things terminal NB-IoT needs to select the appropriate cell camping, a process called cell reselection. RSRP (Reference Signal Receiving Power) the reference signal received power. The RSRP value is expressed herein in terms of local preset reference signal received power data. The reference signal received power RSRP value represents an average value of reference signals received at the same time, and may reflect the path loss strength of the current channel. The value range of the reference signal received power RSRP value is typically-44 dBm to 140dBm, and the larger the reference signal received power RSRP value is, the higher the cell signal quality is.
Referring to fig. 1, the application discloses a method for searching and pre-accessing a terminal cell of a narrowband internet of things, which comprises the following steps:
s110: pre-access cell data comprising a number of consecutive sub-frame signals is acquired.
In the embodiment of the application, the source of the pre-accessed cell data containing a plurality of continuous subframe signals can be wireless data transmitted by a base station or wireless data transmitted by a comprehensive tester simulating the base station. The wireless data transmitted by the base station or the wireless data transmitted by the comprehensive tester simulating the base station is formed by combining frame information carried by a plurality of continuous subframe signals. The information carried in the subframe signal may be information of physical channels such as a narrowband physical broadcast channel Narrowband physical broadcast channel, a narrowband physical downlink control channel Narrowband physical downlink control channel, and a narrowband physical downlink shared channel Narrowband physical downlink shared channel, or information of physical signals such as a narrowband reference signal Narrow band reference signal, a primary synchronization signal Narrowband Primary Synchronization Signal, and a secondary synchronization signal Narrowband Secondary Synchronization Signal.
It should be noted that, the pre-accessed cell data including a plurality of continuous subframe signals, which is acquired by the narrowband internet of things terminal, is obtained by finding the frequency point with the largest energy through frequency sweep. The cell information refers to pre-accessed cell data comprising several consecutive subframe signals. It can be understood that, in the process of performing cell search by the narrowband internet of things terminal, obtaining pre-accessed cell data including a plurality of continuous subframe signals is also an essential step of accessing a cell by the narrowband internet of things terminal.
It can be understood that if the narrowband internet of things terminal wants to improve the efficiency of the access network, the narrowband internet of things terminal must access the sweep frequency point with high sweep energy. If the access from the point with the largest frequency sweeping energy fails, the point with the same frequency sweeping energy or lower than the frequency sweeping energy is selected for pre-access.
S120: and performing correlation operation on the pre-accessed cell data and local pre-stored data to generate initial processing data of the pre-accessed cell.
Specifically, the pre-accessed cell data is data received through wireless transmission, and trigonometric function generation signals are used for wireless transmission. It is obvious to those skilled in the art that the trigonometric function itself has a characteristic of multiplying itself to obtain a maximum value. When the pre-accessed cell data has the same function value as the local pre-stored data, the correlation maximum value can be obtained through the correlation operation.
It will be appreciated that the locally pre-stored data refers to the master synchronization signal Narrowband Primary Synchronization Signal that is pre-stored in the system and generated by a formula. If there is a value of the primary synchronization signal Narrowband Primary Synchronization Signal that is the same as the value of the primary synchronization signal Narrowband Primary Synchronization Signal generated by the pre-stored formula in the pre-accessed cell data, the correlation maximum value thereof can be obtained, and the initial processing data of the pre-accessed cell including the maximum value can be generated.
It can be appreciated that the pre-accessed cell data is correlated with the locally pre-stored data. In a preferred embodiment of the present application, the correlation operation refers to the conjugate multiplication and accumulation of the received signal and the local signal, and the calculation formula is as follows:
where x 17 x r + n is pre-accessed cell data, and npss n is a pre-stored and formulated value of the primary synchronization signal Narrowband Primary Synchronization Signal in the system.
S130, processing the initial processing data of the pre-accessed cell by adopting a peak point energy value extraction model, and generating final processing data of the energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell.
It should be noted that the initial processing data of the pre-accessed cell extracts the peak information data according to the peak energy value extraction model, and the peak energy value is further extracted through the peak information data. The peak energy value is extracted by eliminating the influence of interference signals from the initial processing data of the pre-accessed cell, and further extracting the energy value of the peak information.
Further, in a preferred embodiment of the present application, the initial processing data of the pre-access cell is processed by using a peak point energy value extraction model, and final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-access cell is generated, which specifically includes: extracting data of a plurality of wave peak points in initial processing data of a pre-access cell; calculating the peak energy value of the data of the plurality of peak points; final processing data of energy values of a plurality of peak points extracted from pre-access cell initial processing data is generated.
Specifically, the peak point data is extracted from the initial processing data of the pre-access cell. Considering that the acquired pre-access cell data is data containing a plurality of continuous subframe signals, one or more peak point data may exist in the initial processing data of the pre-access cell. In the extracted one or more peak point data, a peak energy value of the peak point data is calculated. Final processing data of energy values of a plurality of peak points extracted from the pre-access cell initial processing data is generated through calculation of the peak energy values.
Further, in an embodiment of the present application, the extracting data of a plurality of peak points in initial processing data of a pre-access cell specifically includes: extracting peak points meeting the peak-to-average ratio greater than a K value from initial processing data of a pre-access cell; wherein the peak-to-average ratio K value is not lower than 5.
Specifically, when extracting data of a plurality of peak points in initial processing data of a pre-access cell, extracting the peak points according to the peak requirement. And extracting a peak point with the peak-to-average ratio larger than K from initial processing data of the pre-access cell generated by carrying out correlation operation on a plurality of continuous subframe signals and local pre-stored data. Wherein, the peak-to-average ratio in the extracted peak point is larger than the K value, and K is not lower than 5. It will be appreciated that the specific ranges of values of K for the peak-to-average ratio described herein are clearly not limiting on the scope of the application.
It should be noted that the peak-to-average ratio in the extracted peak point is greater than the K value, and K is not less than 5. The peak-to-average ratio is the ratio of the value obtained by adding and averaging the peak point of the waveform and 32 points around the peak point in the initial processing data of the pre-access cell. The peak-to-average ratio is larger than the K value, so that the peak smaller than the K value can be eliminated to carry out subsequent matching with the designated cell, and the time consumed by pre-access and the power consumption are reduced.
It will be understood that the value obtained by adding and averaging 32 points around the peak point of the waveform may be obtained by averaging 64 points, and the specific ranges of the points around the peak point are obviously not limited to the protection scope of the present application.
Further, in a preferred embodiment of the present application, the calculating the peak energy value of the data of the plurality of peak points specifically includes: and calculating the peak energy value of the data of the plurality of peak points by adopting a peak energy algorithm.
Specifically, the peak energy algorithm calculates the data of a plurality of extracted peak points, so as to generate the peak energy value of the data of the peak points.
The calculation expression of the peak point energy value is as follows:
P＝10*log(data)+offset；
wherein P is expressed as peak point energy value. log is a base 10 logarithmic function. data represents peak data of the peak point. Offset represents the peak energy correction value. The peak energy value is obtained by multiplying the number 10 by a logarithmic function of the peak data of the peak point at which the log is 10 and adding the value to the peak energy correction value.
It will be appreciated that the peak energy correction is to compensate for some deviation from the value measured by the instrument due to the system calculation, so that the energy actually output by the instrument is matched by the correction. This error is stationary. It should be understood that the specific values of the peak energy modification values are obviously not limiting the scope of the present application.
S140: and matching the final processing data of the energy values of the wave peak points with the local preset reference signal receiving power data.
Specifically, the final processing data of the energy values of the wave peak points are matched with the local preset reference signal received power data, so that whether the wave peak energy values have values matched with the local preset reference signal received power data or not is judged. When there is a matching value, then the matching is considered successful. If not, the matching is unsuccessful.
It should be noted that the reference signal receives the RSRP value of the power data, i.e. the cell information. The RSRP value of the cell information is an average value of signal powers received on all REs (resource elements) carrying reference signals within a certain symbol, that is, subcarrier powers, which is equivalent to pilot powers in the code division multiple access of the global system for mobile communication Global System for Mobile Communication. For the narrowband internet of things, one orthogonal frequency division multiplexing Orthogonal Frequency Division Multiplexing subcarrier is 15KHZ, so that as long as the carrier bandwidth is known, a plurality of subcarriers are known, and the RSRP power can be calculated.
It can be understood that the local preset reference signal received power data is cell information data to be accessed by the narrowband internet of things terminal, which is issued by the base station in a cell reselection state of the narrowband internet of things terminal. The narrowband internet of things terminal determines whether the cell information obtained by the frequency point with the largest energy is the cell to be accessed or not through the matching between the cell information data to be accessed and the cell information obtained by the frequency point with the largest energy obtained by the frequency sweep.
S150: and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, confirming that the cell search pre-access is successful.
Specifically, when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, the success of cell search pre-access is confirmed. And returning to S110 when the final processing data of the energy values of the wave peak points fails to match with the local preset reference signal received power data, re-acquiring the pre-accessed cell data containing a plurality of continuous subframe signals, and executing the steps from S110 to S140 to continue matching.
Further, in an embodiment of the present application, when the energy value of a peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, it is determined that the cell search pre-access is successful, and the method specifically includes: and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, confirming that the cell searching pre-access is successful.
In the actual application scene of cell search pre-access, when a plurality of continuous subframes are 10 subframes, namely one radio frame, in the acquired signals containing a plurality of continuous subframes, the processed signals are matched with preset reference signals, and if the matching is successful, the pre-access is determined to be successful; if the matching fails, determining that the pre-access fails, and continuously acquiring a plurality of continuous subframes for processing and matching. After at least 15 failed attempts to match, a pre-access failure is determined. It will be appreciated that the specific number of frames of several consecutive sub-frame signals obviously does not limit the scope of the application.
It should be noted that if the matching is successful, it is determined that the cell search pre-access is successful. When the terminal cell of the narrowband Internet of things searches for access, the pre-access process can be used as the first step of the access process, then correction of frequency offset time offset, detection of cell ID numbers and preset accessed cell ID numbers are carried out, and further the terminal of the narrowband Internet of things can be quickly accessed into a designated cell.
It can be understood that the cell search pre-access of the narrowband internet of things terminal is to enable the process efficiency of the access network to be higher when the narrowband internet of things terminal is in a mobile position. And when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, the energy value of the peak point is proved to be the most accordant accessed cell in the cell searching and accessing process of the narrowband internet of things terminal.
It is understood that dB is used in the field of wireless communications to measure the signal strength of a wireless base station or terminal at a location. The energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, that is, the energy value of the final processing data is most consistent with the access range of the pre-accessed cell when the energy value of the peak point is within +/-1 dB. When not within this range of values, then the data energy value of the received cell is considered unsuitable for access, ignoring this cell access.
Referring to fig. 2, the present application discloses a narrowband internet of things terminal, comprising:
an acquisition module 11 is configured to acquire pre-accessed cell data including a number of consecutive subframe signals.
In the embodiment of the application, the source of the pre-accessed cell data containing a plurality of continuous subframe signals can be wireless data transmitted by a base station or wireless data transmitted by a comprehensive tester simulating the base station. The wireless data transmitted by the base station or the wireless data transmitted by the comprehensive tester simulating the base station is formed by combining frame information carried by a plurality of continuous subframe signals. The information carried in the subframe signal may be information of physical channels such as a narrowband physical broadcast channel Narrowband physical broadcast channel, a narrowband physical downlink control channel Narrowband physical downlink control channel, and a narrowband physical downlink shared channel Narrowband physical downlink shared channel, or information of physical signals such as a narrowband reference signal Narrow band reference signal, a primary synchronization signal Narrowband Primary Synchronization Signal, and a secondary synchronization signal Narrowband Secondary Synchronization Signal.
It should be noted that, the pre-accessed cell data including a plurality of continuous subframe signals, which is acquired by the narrowband internet of things terminal, is obtained by finding the frequency point with the largest energy through frequency sweep. The corresponding cell information refers to pre-accessed cell data comprising a plurality of continuous subframe signals. It can be understood that, in the process of performing cell search by the narrowband internet of things terminal, obtaining pre-accessed cell data including a plurality of continuous subframe signals is also the first step of accessing the cell by the narrowband internet of things terminal.
It can be understood that if the narrowband internet of things terminal wants to improve the efficiency of the access network, the narrowband internet of things terminal must access the sweep frequency point with high sweep energy. If the access from the point with the largest frequency sweeping energy fails, the point with the same frequency sweeping energy or lower than the frequency sweeping energy is selected for pre-access.
The first processing module 12 is configured to perform a correlation operation on the pre-accessed cell data and local pre-stored data, and generate initial processing data of the pre-accessed cell.
Specifically, the pre-accessed cell data is data received through wireless transmission, and trigonometric function generation signals are used for wireless transmission. It is obvious to those skilled in the art that the trigonometric function itself has a characteristic of multiplying itself to obtain a maximum value. When the pre-accessed cell data has the same function value as the local pre-stored data, the correlation maximum value can be obtained through the correlation operation.
It will be appreciated that the locally pre-stored data refers to the master synchronization signal Narrowband Primary Synchronization Signal that is pre-stored in the system and generated by a formula. If the pre-accessed cell data has Narrowband Primary Synchronization Signal value which is the same as the pre-stored value of the main synchronization signal Narrowband Primary Synchronization Signal generated by the formula, the correlation maximum value can be obtained, and the initial processing data of the pre-accessed cell containing the maximum value is further generated.
It can be appreciated that the pre-accessed cell data is correlated with the locally pre-stored data. In a preferred embodiment of the present application, the correlation operation refers to the conjugate multiplication and accumulation of the received signal and the local signal, and the calculation formula is as follows:
where x 17 x r + n is pre-accessed cell data, and npss n is a pre-stored and formulated value of the primary synchronization signal Narrowband Primary Synchronization Signal in the system.
And the second processing module 13 is used for processing the initial processing data of the pre-accessed cell by adopting a peak point energy value extraction model to generate final processing data of the energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell.
It should be noted that the initial processing data of the pre-accessed cell extracts the peak information data according to the peak energy value extraction model, and the peak energy value is further extracted through the peak information data. The peak energy value is extracted by eliminating the influence of interference signals from the initial processing data of the pre-accessed cell, and further extracting the energy value of the peak information.
Further, in a preferred embodiment of the present application, the initial processing data of the pre-access cell is processed by using a peak point energy value extraction model, and final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-access cell is generated, which specifically includes: extracting data of a plurality of wave peak points in initial processing data of a pre-access cell; calculating the peak energy value of the data of the plurality of peak points; final processing data of energy values of a plurality of peak points extracted from pre-access cell initial processing data is generated.
Specifically, the peak point data is extracted from the initial processing data of the pre-access cell. Considering that the acquired pre-access cell data is data containing a plurality of continuous subframe signals, one or more peak point data may exist in the initial processing data of the pre-access cell. In the extracted one or more peak point data, a peak energy value of the peak point data is calculated. Final processing data of energy values of a plurality of peak points extracted from the pre-access cell initial processing data is generated through calculation of the peak energy values.
Further, in an embodiment of the present application, the extracting data of a plurality of peak points in initial processing data of a pre-access cell specifically includes: extracting peak points meeting the peak-to-average ratio greater than a K value from initial processing data of a pre-access cell; wherein the peak-to-average ratio K value is not lower than 5.
Specifically, when extracting data of a plurality of peak points in initial processing data of a pre-access cell, extracting the peak points according to the peak requirement. And extracting a peak point with the peak-to-average ratio larger than K from initial processing data of the pre-access cell generated by carrying out correlation operation on a plurality of continuous subframe signals and local pre-stored data. Wherein, the peak-to-average ratio in the extracted peak point is larger than the K value, and K is not lower than 5. It will be appreciated that the specific ranges of values of K for the peak-to-average ratio described herein are clearly not limiting on the scope of the application.
It should be noted that the peak-to-average ratio in the extracted peak point is greater than the K value, and K is not less than 5. The peak-to-average ratio is the ratio of the value obtained by adding and averaging the peak point of the waveform and 32 points around the peak point in the initial processing data of the pre-access cell. The peak-to-average ratio is larger than the K value, so that the peak smaller than the K value can be eliminated to carry out subsequent matching with the designated cell, and the time consumed by pre-access and the power consumption are reduced.
It will be understood that the value obtained by adding and averaging 32 points around the peak point of the waveform may be obtained by averaging 64 points, and the specific ranges of the points around the peak point are obviously not limited to the protection scope of the present application.
Further, in a preferred embodiment of the present application, the calculating the peak energy value of the data of the plurality of peak points specifically includes: and calculating the peak energy value of the data of the plurality of peak points by adopting a peak energy algorithm.
Specifically, the peak energy algorithm calculates the data of a plurality of extracted peak points, so as to generate the peak energy value of the data of the peak points.
The calculation expression of the peak point energy value is as follows:
P＝10*log(data)+offset；
wherein P is expressed as peak point energy value. log is a base 10 logarithmic function. data represents peak data of the peak point. Offset represents the peak energy correction value. The peak energy value is obtained by multiplying the number 10 by a logarithmic function of the peak data of the peak point at which the log is 10 and adding the value to the peak energy correction value.
It will be appreciated that the peak energy correction is to compensate for some deviation from the value measured by the instrument due to the system calculation, so that the energy actually output by the instrument is matched by the correction. This error is stationary. It should be understood that the specific values of the peak energy modification values are obviously not limiting the scope of the present application.
And the matching module 14 is used for matching the final processing data of the energy values of the wave peak points with the local preset reference signal receiving power data.
Specifically, the final processing data of the energy values of the wave peak points are matched with the local preset reference signal received power data, so that whether the wave peak energy values have values matched with the local preset reference signal received power data or not is judged. When there is a matching value, then the matching is considered successful. If not, the matching is unsuccessful.
It should be noted that the reference signal receives the RSRP value of the power data, i.e. the cell information. The RSRP value of the cell information is an average value of signal powers received on all REs (resource elements) carrying reference signals within a certain symbol, that is, subcarrier powers, which is equivalent to pilot powers in the code division multiple access of the global system for mobile communication Global System for Mobile Communication. For the narrowband internet of things, one orthogonal frequency division multiplexing Orthogonal Frequency Division Multiplexing subcarrier is 15KHZ, so that as long as the carrier bandwidth is known, a plurality of subcarriers are known, and the RSRP power can be calculated.
It can be understood that the local preset reference signal received power data is cell information data to be accessed by the narrowband internet of things terminal, which is issued by the base station in a cell reselection state of the narrowband internet of things terminal. The narrowband internet of things terminal determines whether the cell information obtained by the frequency point with the largest energy is the cell to be accessed or not through the matching between the cell information data to be accessed and the cell information obtained by the frequency point with the largest energy obtained by the frequency sweep.
And the output module 15 is configured to confirm that the cell search pre-access is successful when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data.
Specifically, when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, the success of cell search pre-access is confirmed. And returning to S110 when the final processing data of the energy values of the wave peak points fails to match with the local preset reference signal received power data, re-acquiring the pre-accessed cell data containing a plurality of continuous subframe signals, and executing the steps from S110 to S140 to continue matching.
Further, in an embodiment of the present application, when the energy value of a peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, it is determined that the cell search pre-access is successful, and the method specifically includes: and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, confirming that the cell searching pre-access is successful.
In the actual application scene of cell search pre-access, when a plurality of continuous subframes are 10 subframes, namely one radio frame, in the acquired signals containing a plurality of continuous subframes, the processed signals are matched with preset reference signals, and if the matching is successful, the pre-access is determined to be successful; if the matching fails, determining that the pre-access fails, and continuously acquiring a plurality of continuous subframes for processing and matching. After at least 15 failed attempts to match, a pre-access failure is determined. It will be appreciated that the specific number of frames of several consecutive sub-frame signals obviously does not limit the scope of the application.
It should be noted that if the matching is successful, it is determined that the cell search pre-access is successful. When the terminal cell of the narrowband Internet of things searches for access, the pre-access process can be used as the first step of the access process, then correction of frequency offset time offset, detection of cell ID numbers and preset accessed cell ID numbers are carried out, and further the terminal of the narrowband Internet of things can be quickly accessed into a designated cell.
It can be understood that the cell search pre-access of the narrowband internet of things terminal is to enable the process efficiency of the access network to be higher when the narrowband internet of things terminal is in a mobile position. And when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, the energy value of the peak point is proved to be the most accordant accessed cell in the cell searching and accessing process of the narrowband internet of things terminal.
It is understood that dB is used in the field of wireless communications to measure the signal strength of a wireless base station or terminal at a location. The energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, that is, the energy value of the final processing data is most consistent with the access range of the pre-accessed cell when the energy value of the peak point is within +/-1 dB. When the value is smaller than this, the data energy value of the received cell is considered unsuitable for access, and the cell access is ignored.
The embodiment of the application provides a processor, which is characterized in that the processor is used for running a program, wherein the program runs to execute the steps of any one of the method for searching the pre-access method of the terminal cell of the narrowband internet of things.
The embodiment of the application also provides a computer readable storage medium, on which computer readable instructions are stored, which when executed by a processor of a computer, cause the computer to execute any one of the methods of searching for pre-access to a terminal cell of a narrowband internet of things.
In particular, a storage medium is stored with a computer program, and when the computer program is run by a processor, the steps of the control method of the unmanned aerial vehicle in the embodiment of the method for searching and pre-accessing the terminal cell of the narrowband internet of things can be executed, and a specific implementation manner can refer to the embodiment of the method and will not be repeated herein.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement "comprises" or "comprising" an element defined by … … does not exclude the presence of other identical elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. The terminal cell search pre-access method of the narrowband Internet of things is characterized by comprising the following steps of:
acquiring pre-accessed cell data comprising a plurality of continuous subframe signals;
performing correlation operation on the pre-accessed cell data and local pre-stored data to generate initial processing data of the pre-accessed cell; the correlation operation is obtained by conjugate multiplication and accumulation of the received signal and the local signal, and the calculation formula is as follows:
wherein x 17 x r+n]Cell data denoted pre-access, npss * [n]The value of the main synchronizing signal Narrowband Primary Synchronization Signal which is stored in the system in advance and is generated by a formula;
processing the initial processing data of the pre-accessed cell by adopting a peak point energy value extraction model to generate final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell;
matching final processing data of the energy values of the wave peak points with local preset reference signal receiving power data;
and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, confirming that the cell search pre-access is successful.
2. The method of claim 1, wherein the initial processing data of the pre-access cell is processed by using a peak energy value extraction model, and final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-access cell is generated, specifically comprising:
extracting data of a plurality of wave peak points in initial processing data of a pre-access cell;
calculating the peak energy value of the data of the plurality of peak points;
final processing data of energy values of a plurality of peak points extracted from pre-access cell initial processing data is generated.
3. The method of claim 2, wherein the extracting data of a plurality of peak points in the initial processing data of the pre-access cell specifically comprises:
extracting peak points meeting the peak-to-average ratio greater than a K value from initial processing data of a pre-access cell;
wherein the peak-to-average ratio K value is not lower than 5.
4. The method according to claim 2, wherein calculating the peak energy value of the data of the plurality of peak points comprises:
and calculating the peak energy value of the data of the plurality of peak points by adopting a peak energy algorithm.
5. The method of claim 1, wherein when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, confirming that the cell search pre-access is successful, specifically comprising:
and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, confirming that the cell searching pre-access is successful.
6. The utility model provides a narrowband thing networking terminal which characterized in that, narrowband thing networking terminal includes:
an acquisition module, configured to acquire pre-accessed cell data including a plurality of continuous subframe signals;
the first processing module is used for carrying out correlation operation on the pre-accessed cell data and local pre-stored data to generate initial processing data of the pre-accessed cell; the correlation operation is obtained by conjugate multiplication and accumulation of the received signal and the local signal, and the calculation formula is as follows:
wherein x 17 x r+n]Cell data denoted pre-access, npss * [n]The value of the main synchronizing signal Narrowband Primary Synchronization Signal which is stored in the system in advance and is generated by a formula;
the second processing module is used for processing the initial processing data of the pre-accessed cell by adopting a peak point energy value extraction model to generate final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell;
the matching module is used for matching the final processing data of the energy values of the wave peak points with the local preset reference signal receiving power data;
and the output module is used for confirming that the cell search pre-access is successful when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data.
7. The terminal of claim 6, wherein the second processing module is configured to process the initial processing data of the pre-accessed cell using a peak energy value extraction model, and generate final processing data of energy values of a plurality of peak points extracted from the initial processing data of the pre-accessed cell, and specifically includes:
extracting data of a plurality of wave peak points in initial processing data of a pre-access cell;
calculating the peak energy value of the data of the plurality of peak points;
final processing data of energy values of a plurality of peak points extracted from pre-access cell initial processing data is generated.
8. The terminal of claim 7, wherein the extracting data of a plurality of peak points in initial processing data of the pre-access cell specifically includes:
extracting peak points meeting the peak-to-average ratio greater than a K value from initial processing data of a pre-access cell;
wherein the peak-to-average ratio K value is not lower than 5.
9. The terminal of claim 7, wherein the calculating the peak energy value of the data for the plurality of peak points comprises:
and calculating the peak energy value of the data of the plurality of peak points by adopting a peak energy algorithm.
10. The terminal of claim 6, wherein the output module is configured to confirm that the cell search pre-access is successful when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is successfully matched with the local preset reference signal received power data, specifically configured to:
and when the energy value of one peak point in the final processing data of the energy values of the plurality of peak points is within +/-1 dB of the local preset reference signal receiving power data, confirming that the cell searching pre-access is successful.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100809020B1 (en) * | 2006-12-08 | 2008-03-03 | 한국전자통신연구원 | Apparatus and method for acquiring initial synchronization of mobile in communication system |
| KR20110009552A (en) * | 2009-07-22 | 2011-01-28 | 주식회사 케이티 | The method of frame synchronization acquisition and the cell search method robust to a interference of multi-cell |
| CN106507442A (en) * | 2016-09-30 | 2017-03-15 | 宇龙计算机通信科技(深圳)有限公司 | Control method and device that cell is accessed |
| CN108112055A (en) * | 2017-12-19 | 2018-06-01 | 努比亚技术有限公司 | APN acquisition methods, mobile terminal, network-side and storage medium |
| CN110191071A (en) * | 2019-06-17 | 2019-08-30 | 武汉虹信通信技术有限责任公司 | Measurement method and device based on channel estimation in a kind of narrowband Internet of things system |
| WO2020032749A1 (en) * | 2018-08-09 | 2020-02-13 | 엘지전자 주식회사 | Operation method of terminal and base station in wireless communication system supporting narrowband internet of things, and apparatus supporting same |
| CN111464257A (en) * | 2019-01-21 | 2020-07-28 | 普天信息技术有限公司 | Cell search processing method and device |
| CN112312499A (en) * | 2020-10-30 | 2021-02-02 | 紫光展锐(重庆)科技有限公司 | Cell reselection method and device |
| CN112637801A (en) * | 2020-12-11 | 2021-04-09 | 深圳市汇顶科技股份有限公司 | Cell residence method, terminal and computer readable storage medium |
| CN112752322A (en) * | 2019-10-31 | 2021-05-04 | 中国电信股份有限公司 | 5G millimeter wave cell searching and accessing method based on terminal capability |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11057800B2 (en) * | 2017-05-04 | 2021-07-06 | Qualcomm Incorporated | Neighbor cell measurement and reselection for narrowband operation |
-
2021
- 2021-06-04 CN CN202110629294.4A patent/CN113422666B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100809020B1 (en) * | 2006-12-08 | 2008-03-03 | 한국전자통신연구원 | Apparatus and method for acquiring initial synchronization of mobile in communication system |
| KR20110009552A (en) * | 2009-07-22 | 2011-01-28 | 주식회사 케이티 | The method of frame synchronization acquisition and the cell search method robust to a interference of multi-cell |
| CN106507442A (en) * | 2016-09-30 | 2017-03-15 | 宇龙计算机通信科技(深圳)有限公司 | Control method and device that cell is accessed |
| CN108112055A (en) * | 2017-12-19 | 2018-06-01 | 努比亚技术有限公司 | APN acquisition methods, mobile terminal, network-side and storage medium |
| WO2020032749A1 (en) * | 2018-08-09 | 2020-02-13 | 엘지전자 주식회사 | Operation method of terminal and base station in wireless communication system supporting narrowband internet of things, and apparatus supporting same |
| CN111464257A (en) * | 2019-01-21 | 2020-07-28 | 普天信息技术有限公司 | Cell search processing method and device |
| CN110191071A (en) * | 2019-06-17 | 2019-08-30 | 武汉虹信通信技术有限责任公司 | Measurement method and device based on channel estimation in a kind of narrowband Internet of things system |
| CN112752322A (en) * | 2019-10-31 | 2021-05-04 | 中国电信股份有限公司 | 5G millimeter wave cell searching and accessing method based on terminal capability |
| CN112312499A (en) * | 2020-10-30 | 2021-02-02 | 紫光展锐(重庆)科技有限公司 | Cell reselection method and device |
| CN112637801A (en) * | 2020-12-11 | 2021-04-09 | 深圳市汇顶科技股份有限公司 | Cell residence method, terminal and computer readable storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 《认知异构网络物理层干扰管理技术研究》;田润;《中国优秀硕士学位论文全文数据库 信息科技辑》;全文 * |
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