CN114828162A - Network access method, NB-IoT chip, NB-IoT terminal, and computer storage medium - Google Patents

Network access method, NB-IoT chip, NB-IoT terminal, and computer storage medium Download PDF

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CN114828162A
CN114828162A CN202110112249.1A CN202110112249A CN114828162A CN 114828162 A CN114828162 A CN 114828162A CN 202110112249 A CN202110112249 A CN 202110112249A CN 114828162 A CN114828162 A CN 114828162A
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frequency point
cell
sinr
access cell
rsrp
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CN114828162B (en
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吕云飞
王继辉
廖若昀
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
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  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application provides a network access method, an NB-IoT chip, an NB-IoT terminal and a computer storage medium, wherein the network access method is applied to the NB-IoT chip, the NB-IoT chip obtains i frequency points through frequency sweep operation, i is larger than or equal to 1, and the network access method comprises the following steps: according to signal characteristic data of a serving cell at the j-th frequency point in the i frequency points, screening the serving cell searched from the j-th frequency point to obtain a candidate access cell, wherein j is more than or equal to 1 and is less than or equal to i, and the signal characteristic data comprises at least one of RSRP and SINR; the NB-IoT chip demodulates the system message and the RRC message of the candidate access cell under the j frequency point; if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell at the jth frequency point, the NB-IoT chip is accessed to the candidate access cell in which the system message at the jth frequency point is successfully demodulated, so that the success rate of the network access process is ensured, the network access time delay is reduced, and the power consumption of the NB-IoT chip or the NB-IoT terminal is saved.

Description

Network access method, NB-IoT chip, NB-IoT terminal, and computer storage medium
Technical Field
The embodiment of the application relates to the technical field of the Internet of things, in particular to a network access method, an NB-IoT chip, an NB-IoT terminal and a computer storage medium.
Background
The Internet of Things (IoT) is a narrowband cellular Internet of Things technology, supports cellular data connection of low-power consumption devices in a wide area network, and is mainly applied to application scenarios of ultra-low power consumption, weak coverage and access of a large number of chips or terminals. With the evolution of NB-IoT protocol with 5G at the 3GPP peak, a solid foundation is laid for the sustainable development of NB-IoT (Narrow Band-Internet of Things) technology. The NB-IoT technology has a coverage gain 20dB higher than that of the existing network, which is equivalent to improving the capacity of a coverage area by 100 times, and the improvement of the gain mainly depends on the combined gain of a large number of retransmissions to improve the coverage performance, but whether the NB-IoT chip or the terminal can finally and successfully demodulate correct data, and whether the NB-IoT chip or the terminal can quickly search a serving cell with better signal quality and real existence from all frequency points in the supported frequency band. However, according to the configuration of the actual existing network of the operator, the frequency points used by all the serving cells in a fixed area are the same frequency point, which may cause interference in the system, i.e. co-channel interference. Due to the existence of the same frequency interference, when an NB-IoT chip or a terminal searches for a serving cell at a frequency point, many unreal serving cells or serving cells with extremely poor signal quality can be searched, and besides, under the conditions that a base station is dense, and multipath fading exist, many unreal serving cells or serving cells with extremely poor signal quality can be searched, so that the success rate of accessing the NB-IoT chip or the terminal to the serving cell is low, the network access delay is large, the power consumption is large, and the like.
Disclosure of Invention
In view of the above, one of the technical problems to be solved by the embodiments of the present application is to provide a network access method, an NB-IoT chip, an NB-IoT terminal, and a computer storage medium, which overcome or alleviate the above-mentioned shortcomings in the prior art.
In a first aspect, an embodiment of the present application provides a network access method, which is applied to an NB-IoT chip, where the NB-IoT chip obtains i frequency points through frequency sweep operation, where i is greater than or equal to 1, and the network access method includes:
according to signal characteristic data of a serving cell at the j-th frequency point in the i frequency points, screening the serving cell searched at the j-th frequency point to obtain a candidate access cell, wherein j is more than or equal to 1 and is less than or equal to i, and the signal characteristic data comprises at least one of RSRP and SINR;
the NB-IoT chip demodulates the system message and the RRC message of the candidate access cell under the j frequency point;
if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell under the jth frequency point, the NB-IoT chip accesses to the candidate access cell in which the system message is successfully demodulated under the jth frequency point.
Optionally, in an embodiment of the present application, the method further includes:
if the NB-IoT chip does not successfully demodulate the system messages and RRC messages of all the candidate access cells at the jth frequency point, the NB-IoT chip demodulates the system messages and RRC messages of the candidate access cells at the kth frequency point, k is more than or equal to 1 and less than or equal to i, and k is not equal to j;
if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell under the k frequency point, the NB-IoT chip accesses to the candidate access cell in which the system message is successfully demodulated under the k frequency point.
Optionally, in an embodiment of the present application, the screening, according to the signal characteristic data of the serving cell at the jth frequency point in the i frequency points, the serving cell searched at the jth frequency point to obtain a candidate access cell further includes: determining the RSRP according to a narrowband primary synchronization signal of the NB-IoT chip; and determining the SINR according to the narrowband auxiliary synchronization signal of the NB-IoT chip.
Optionally, in an embodiment of the present application, if the signal characteristic data includes RSRP and SINR, the screening, according to the signal characteristic data of the serving cell at the j-th frequency point in the i frequency points, the serving cell searched at the j-th frequency point to obtain a candidate access cell includes: screening the service cell under the jth frequency point according to the RSRP to obtain a first access cell; screening the first access cell according to the SINR to obtain the candidate access cell;
or screening the serving cell under the jth frequency point according to the RSRP to obtain a first access cell; screening the service cell under the jth frequency point according to the SINR to obtain a second access cell; and determining the candidate access cells according to the first access cell and the second access cell.
Optionally, in an embodiment of the present application, each serving cell at the jth frequency point corresponds to one RSRP and one SINR, and the screening the serving cells at the jth frequency point according to the RSRP to obtain a first access cell includes: determining the maximum value of RSRP of all the service cells at the jth frequency point, and screening the service cells at the jth frequency point according to an RSRP difference value to obtain a first access cell, wherein the RSRP difference value is the difference value between the maximum value of the RSRP and an RSRP tolerance value;
the screening the first access cell according to the SINR to obtain the candidate access cell includes: determining the maximum SINR values of all service cells at the jth frequency point, and screening the first access cell according to an SINR difference value to obtain the candidate access cell, wherein the SINR difference value is a difference value between the maximum SINR value and an SINR tolerance value;
the screening the serving cell under the jth frequency point according to the SINR to obtain a second access cell includes: screening the service cell under the j frequency point according to an SINR difference value to obtain a second access cell, wherein the SINR difference value is the difference value between the maximum value of the SINR and an SINR tolerance value;
optionally, in an embodiment of the present application, the screening the serving cell at the jth frequency point according to the RSRP difference value to obtain a first access cell includes: the service cell with the RSRP value larger than the RSRP difference value under the jth frequency point is taken as the first access cell;
the screening the first access cell according to the SINR difference to obtain the candidate access cell includes: taking the first access cell with the SINR value being greater than or equal to the SINR difference value in the first access cell as the candidate access cell;
the screening the serving cell under the jth frequency point according to the SINR difference to obtain a second access cell includes: and taking the serving cell with the SINR value at the jth frequency point being greater than or equal to the SINR difference value as the second access cell.
Optionally, in an embodiment of the present application, if the NB-IoT chip does not successfully demodulate the system messages and the RRC messages of all the candidate access cells at the i-frequency point, the method further includes: and increasing the RSRP tolerance value and the SINR tolerance value to re-screen the serving cell to obtain a new candidate access cell.
Optionally, in an embodiment of the present application, when the NB-IoT chip demodulates the system message and the RRC message of the candidate access cell at the j-th frequency point, the system message and the RRC message of the candidate access cell at the j-th frequency point with the largest RSRP value or the largest SINR value are demodulated.
Optionally, in an embodiment of the present application, the jth frequency point is a frequency point detected by frequency sweeping before the kth frequency point.
Optionally, in an embodiment of the present application, a maximum value of the signal characteristic data in the serving cell at the jth frequency point is greater than a maximum value of the signal characteristic data in the serving cell at the kth frequency point.
Optionally, in an embodiment of the present application, the demodulating, by the NB-IoT chip, the system message and the RRC message of the candidate access cell at the jth frequency point includes:
the NB-IoT chip demodulates the system messages of the candidate access cells under the j frequency point;
and if the demodulation of the system message of at least one candidate access cell exists at the jth frequency point successfully, the NB-IoT chip demodulates the RRC message of the candidate access cell of which the system message at the jth frequency point is successfully demodulated.
In a second aspect, an embodiment of the present application provides an NB-IoT chip configured to perform the network access method according to any embodiment of the present application.
In a third aspect, an embodiment of the present application provides an NB-IoT terminal, which includes the NB-IoT chip described in any embodiment of the present application.
In a fourth aspect, an embodiment of the present application provides a computer storage medium, where the computer storage medium stores a computer-executable program, and the computer program is used to execute the network access method according to any embodiment of the present application when the computer program is executed.
In the scheme provided by the embodiment of the application, the NB-IoT chip obtains i frequency points through frequency sweeping operation, wherein i is larger than or equal to 1, and the network access method comprises the following steps: according to signal characteristic data of a service cell at the jth frequency point in the i frequency points, screening the service cell searched at the jth frequency point to obtain a candidate access cell, wherein j is more than or equal to 1 and less than or equal to i, and the signal characteristic data comprises at least one of RSRP and SINR; the NB-IoT chip demodulates system messages and RRC messages of the candidate access cells under the j frequency point; if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell at the jth frequency point, the NB-IoT chip accesses to the candidate access cell in which the system message is successfully demodulated at the jth frequency point, so that the candidate access cell is ensured to be a service cell which really exists and has better signal quality, and the NB-IoT terminal initiates a network access process to the service cells which really exist and have better signal quality, thereby ensuring the success rate of the network access process, simultaneously reducing the network access time delay and saving the power consumption of the NB-IoT chip or the NB-IoT terminal.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic flowchart of a network access method according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a process of obtaining a candidate access cell at a jth frequency point according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a process of obtaining a candidate access cell at a jth frequency point according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a network access method according to an embodiment of the present application.
Detailed Description
It is not necessary for any particular embodiment of the invention to achieve all of the above advantages at the same time.
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application shall fall within the scope of the protection of the embodiments in the present application.
In the scheme provided by the embodiment of the application, the NB-IoT chip obtains i frequency points through frequency sweeping operation, wherein i is larger than or equal to 1, and the network access method comprises the following steps: according to signal characteristic data of a serving cell at the j-th frequency point in the i frequency points, screening the serving cell searched at the j-th frequency point to obtain a candidate access cell, wherein j is more than or equal to 1 and is less than or equal to i, and the signal characteristic data comprises at least one of RSRP and SINR; the NB-IoT chip demodulates system messages and RRC messages of the candidate access cells under the j frequency point; if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell at the jth frequency point, the NB-IoT chip accesses to the candidate access cell in which the system message is successfully demodulated at the jth frequency point, so that the candidate access cell is ensured to be a service cell which really exists and has better signal quality, and the NB-IoT terminal initiates a network access process to the service cells which really exist and have better signal quality, thereby ensuring the success rate of the network access process, simultaneously reducing the network access delay and saving the power consumption of the NB-IoT terminal.
In the embodiment of the present application, the Signal characteristic data includes at least one of an RSRP (Reference Signal Receiving Power) and an SINR (Signal to Interference plus Noise Ratio) of the serving cell at the jth frequency point.
The following further describes a specific implementation of the embodiments of the present application with reference to the drawings of the embodiments of the present application.
In the application, the NB-IoT terminal obtains i frequency points through frequency sweeping operation, wherein i is larger than or equal to 1, the jth frequency point specifically refers to a certain frequency point with a service cell, and the access scheme of the application does not need to be executed for the frequency point without the service cell.
Fig. 1 is a schematic flowchart of a network access method according to an embodiment of the present application; as shown in fig. 1, after the NB-IoT chip or the terminal is powered on and started to sequentially complete initialization (including USIM card identification and Network access initialization) and PLMN (Public Land Mobile Network) selection, scanning operations are completed to obtain i frequency points in total, and the steps of the Network access method of the NB-IoT chip or the terminal shown in fig. 1 are executed:
s101, according to signal characteristic data of a service cell under a j frequency point in the i frequency points, screening the service cell searched under the j frequency point to obtain a candidate access cell, wherein j is more than or equal to 1 and less than or equal to i;
in this implementation, as described above, the signal characteristic data includes RSRP and SINR.
Optionally, in an embodiment, the screening, according to the signal characteristic data of the serving cell at the j-th frequency point in the i frequency points, the serving cell searched at the j-th frequency point to obtain a candidate access cell further includes: determining the RSRP according to a Narrowband Primary Synchronization Signal (NPSS) of the NB-IoT chip; and determining the SINR according to a Narrowband Secondary Synchronization Signal (NSSS) of the NB-IoT chip.
Optionally, in this embodiment, when an NB-IoT chip or a terminal searches for a serving cell on a jth frequency point, for one of the serving cells, the NB-IoT chip or the terminal detects a Zadoff-Chu sequence (ZC sequence for short) in a frequency domain of a Primary Synchronization Signal through a NPSS (Narrowband Primary Synchronization Signal), correlates the ZC sequence with a local sequence of the NB-IoT chip or the terminal to obtain a peak of a correlation peak, and uses the peak as an RSRP of the serving cell. The NB-IoT chip or the terminal measures the SINR of the serving cell through NSSS (Narrowband Secondary Synchronization Signal), and so on, thereby obtaining RSRP and SINR of all serving cells at the j-th frequency point.
Optionally, in an embodiment, the jth frequency point is a frequency point detected by frequency sweeping before the kth frequency point, that is, in this embodiment, the determination of the candidate access cells is performed in the order of obtaining the frequency points by frequency sweeping operation, so that it is convenient to perform subsequent access to the serving cell according to the order of the frequency points, the success rate of network access is further improved, the time delay of network access is reduced, and power consumption is saved.
Alternatively, in another embodiment, the maximum value of the signal characteristic data in the serving cell at the jth frequency point is greater than the maximum value of the signal characteristic data in the serving cell at the kth frequency point, for example, when the scheme of the present application is executed for the first time, if the jth frequency point is the 1 st frequency point, the 1 st frequency point is the serving cell with the best signal quality (that is, the maximum values of the signal characteristic data in all candidate serving cells at the ith frequency point) in the i frequency points. And if the jth frequency point is other frequency points in the 2 nd to ith frequency points, selecting a service cell corresponding to the maximum value of the signal characteristic data in all the service cells of the 2 nd to ith frequency points, namely, selecting the frequency point to participate in the step S101 from the frequency points which never participate in the step S101 on the basis of the signal quality, so as to select the service cell with the best signal quality as far as possible and participate in the access of the subsequent service cells.
In this embodiment, by selecting the maximum value of the signal characteristic data, a cell with a signal quality and a cell that actually exists can be effectively screened from the searched serving cells.
Fig. 2 is a schematic flowchart of a process of obtaining a candidate access cell at a jth frequency point according to an embodiment of the present application; as shown in fig. 2, if the signal characteristic data includes RSRP and SINR, the screening the serving cell searched from the jth frequency point according to the signal characteristic data to obtain a candidate access cell includes:
S111A, screening the serving cell under the jth frequency point according to the RSRP to obtain a first access cell;
optionally, in an embodiment, each serving cell at the jth frequency point corresponds to one RSRP and one SINR, and the screening the serving cells at the jth frequency point according to the RSRP to obtain a first access cell includes: determining the maximum value of RSRP of all the service cells at the jth frequency point, and screening the service cells at the jth frequency point according to an RSRP difference value to obtain a first access cell, wherein the RSRP difference value is the difference value between the maximum value of the RSRP and the RSRP tolerance value.
Optionally, in an embodiment, the screening the serving cell at the jth frequency point according to the RSRP difference value to obtain a first access cell includes: and taking the serving cell with the RSRP value larger than the RSRP difference value under the jth frequency point as the first access cell.
S121A, screening the first access cell according to the SINR to obtain the candidate access cell.
Optionally, in an embodiment, the screening the first access cell according to the SINR to obtain the candidate access cell includes: and determining the maximum SINR of all the service cells at the jth frequency point, and screening the first access cell according to the SINR difference to obtain the candidate access cell, wherein the SINR difference is the difference between the maximum SINR and the SINR tolerance value.
Optionally, in an embodiment, the screening the first access cell according to the SINR difference to obtain the candidate access cell includes: and taking the first access cell with the SINR value being more than or equal to the SINR difference value in the first access cell as the candidate access cell.
In the embodiment shown in fig. 2, in the embodiment, when the serving cell search is performed on the jth frequency point, a plurality of serving cells may be searched, and each serving cell corresponds to one RSRP and one SINR, so that a plurality of RSRPs and a plurality of SINRs are obtained in total. The maximum value of the RSRP, that is, the maximum value among the plurality of RSRPs (abbreviated as Max1), and the maximum value of the SINR, that is, the maximum value among the plurality of SINRs (abbreviated as Max 2).
Specifically, the RSRP tolerance value is recorded as α, the maximum value of the RSRPs is Max1, and when performing serving cell screening, a serving cell whose RSRP value is not less than (Max1- α) is used as a first access cell; still further, the SINR tolerance value is denoted as β, and the maximum value of the SINRs is denoted as Max2, when performing serving cell screening, a serving cell in the first access cell whose SINR value is not less than (Max2- β) is taken as a candidate access cell, where the candidate access cell is a cell with high quality and high signal quality, and the number of the candidate access cells may be one or more.
Here, the RSRP tolerance value and the SINR tolerance value may be adjustable according to the requirements of the application scenario, for example, one of the RSRP tolerance value and the SINR tolerance value is adjusted, or both of the RSRP tolerance value and the SINR tolerance value are adjusted. The magnitude of the adjustment is determined according to the requirements of the application scenario. The larger the RSRP tolerance value and the SINR tolerance value are set, the larger the number of candidate access cells is, and conversely, the smaller the number of candidate access cells is. In addition, the adjustment may also be performed according to the NB-IoT chip or the terminal signal demodulation capability, for example, the signal demodulation capability is strong, the RSRP tolerance value and the SINR tolerance value may be set to be small, otherwise, the setting is large.
In this embodiment, similarly to the reason for obtaining the plurality of RSRPs, a plurality of SINRs are obtained for the j-th frequency point, where the maximum value of the SINRs is the maximum value among the SINRs.
Here, since the serving cell corresponding to the maximum value of RSRP generally has the best SINR, the SINR of the serving cell corresponding to the maximum value of RSRP may be directly set as the maximum value of SINR.
Fig. 3 is a schematic flowchart of a process of obtaining a candidate access cell at a jth frequency point according to an embodiment of the present application; as shown in fig. 3, if the signal characteristic data includes RSRP and SINR, the screening the serving cell searched from the jth frequency point according to the signal characteristic data to obtain a candidate access cell includes:
S111B, screening the serving cell under the jth frequency point according to the RSRP to obtain a first access cell;
step S111B is similar to step S111A described above, with further reference to FIG. 2.
S121B, screening the serving cell under the jth frequency point according to the SINR to obtain a second access cell;
S131B, determining the candidate access cell according to the first access cell and the second access cell.
Optionally, in an embodiment, the screening the serving cell at the jth frequency point according to the SINR in step S121B to obtain a second access cell includes: and screening the service cell under the j frequency point according to an SINR difference value to obtain a second access cell, wherein the SINR difference value is the difference value between the maximum value of the SINR and the SINR tolerance value.
Optionally, in an embodiment, the screening the serving cell at the jth frequency point according to the SINR difference to obtain a second access cell includes: and taking the serving cell with the SINR value at the jth frequency point being greater than or equal to the SINR difference value as the second access cell.
In S131B, access cells belonging to both the first access cell and the second access cell are used as candidate access cells.
The RSRP tolerance value and SINR tolerance value in fig. 3 are described with reference to the embodiment of fig. 2.
S102, the NB-IoT chip demodulates system messages and RRC messages of the candidate access cells under the j frequency point;
in this embodiment, the RRC message is a Radio Resource Control (Radio Resource Control) message.
Optionally, in an embodiment, when the NB-IoT chip demodulates the system message and the RRC message of the candidate access cell at the j-th frequency point, the system message and the RRC message of the candidate access cell at which the RSRP value is the largest or the SINR value is the largest at the j-th frequency point are demodulated, so as to ensure that the candidate access cell with better signal quality at the j-th frequency point is accessed as far as possible.
S103, judging whether system messages of at least one candidate access cell exist under the jth frequency point and RRC messages are successfully demodulated;
S104A, if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell at the jth frequency point, the NB-IoT chip accesses the candidate access cell in which the system message is successfully demodulated at the jth frequency point;
S104B, if the NB-IoT chip does not successfully demodulate the system messages and RRC messages of all the candidate access cells at the jth frequency point, the NB-IoT chip demodulates the system messages and RRC messages of the candidate access cells at the kth frequency point, k is more than or equal to 1 and less than or equal to i, and k is not equal to j;
s105, if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell under the k frequency point, the NB-IoT chip accesses the candidate access cell in which the system message is successfully demodulated under the k frequency point.
In this embodiment, the System message includes MIB (Master information block), SIB1(System information block 1), and SI (System information, System message); if the MIB, the SIB1, and the SI are successfully demodulated, then the RRC (Radio Resource Control) message of the candidate access cell in which the system message is successfully demodulated at the jth frequency point is demodulated, and if the demodulation is successful, then the candidate access cell in which the system message is successfully demodulated at the jth frequency point is accessed. If the candidate access cell in which the system message is successfully demodulated does not exist at the jth frequency point, demodulating the system message of the candidate service cell at the kth frequency point and demodulating the RRC message of the candidate access cell in which the system message at the kth frequency point is successfully demodulated, and if the demodulation is successful, accessing the candidate access cell in which the system message at the kth frequency point is successfully demodulated; otherwise, demodulating the system message and the RRC message of the candidate serving cell under the L-th frequency point, and so on, wherein L is not equal to j is not equal to k, and L is not less than 1 and not more than i.
Further, in an embodiment, after demodulating the successful system message, the NB-IoT chip initiates an attach procedure to the candidate serving cell where the system message is successfully demodulated at the jth frequency point to demodulate the RRC message of the candidate serving cell, and if the RRC message is successfully demodulated, the NB-IoT chip accesses the candidate access cell where the system message is successfully demodulated at the jth frequency point.
Further, in an embodiment, it may be specifically determined whether the system message is successfully demodulated by looking at the log on the NB-IoT chip, for example, if the hyper frame number, the scheduling information of the SIB1, the deployment mode of the serving cell, and the like are recorded in the log, it indicates that the demodulating MIB is successful, if the log has the PLMN, the candidate serving cell ID, the scheduling information of the SI, and the like, it indicates that the demodulating SIB1 is successful, and if the log has the change period of the system message, the cell reselection configuration information, and the like, it indicates that the demodulating SIB1 is successful. Here, it should be noted that the specific data recorded in the log is only an example, and is not limited to only these data.
Further, in an embodiment, in addition, whether the NB-IoT chip accesses to one of the candidate serving cells is checked by means of an AT instruction. For example, the AT instructs to check whether the interaction process with the candidate access serving cell is complete in the process of accessing the NB-IoT chip to the candidate serving cell, and if so, may indicate that the NB-IoT chip successfully accesses one of the candidate serving cells.
Here, it should be noted that the number of the candidate access cells in each frequency point may be the same or different. Therefore, the number of times of the effective candidate access cells under different frequency points to circularly execute the steps may be the same or different.
Further, in an embodiment, if the NB-IoT chip does not successfully demodulate the system messages and RRC messages of all the candidate access cells at the i-frequency point, the method further includes: the RSRP tolerance value and the SINR tolerance value are increased to re-screen the serving cell to obtain a new candidate access cell, so as to execute the scheme of the embodiment shown in fig. 1 based on the new candidate access cell.
Further, in another embodiment, the demodulating, by the NB-IoT chip, the system message and the RRC message of the candidate access cell at the jth frequency point may include: the NB-IoT chip demodulates the system messages of the candidate access cells under the j frequency point; and if the demodulation of the system message of at least one candidate access cell exists at the jth frequency point successfully, the NB-IoT chip demodulates the RRC message of the candidate access cell of which the system message at the jth frequency point is successfully demodulated. The following is an exemplary description using fig. 4 as an example.
Fig. 4 is a schematic flow chart of a network access method in an embodiment of the present application; as shown in fig. 4, in this embodiment, the network access method includes:
s401, according to signal characteristic data of a service cell under a jth frequency point in the i frequency points, screening the service cell searched under the jth frequency point to obtain a candidate access cell, wherein j is more than or equal to 1 and less than or equal to i;
s402, the NB-IoT chip demodulates the system message of the candidate access cell under the j frequency point;
s403, judging whether system information of at least one candidate access cell is successfully demodulated under the jth frequency point, if so, executing S404; otherwise, step S407 is executed.
S404, the NB-IoT chip demodulates RRC messages of the candidate access cells of which the system messages under the jth frequency point are successfully demodulated;
s405, judging whether the RRC message of the candidate access cell, of which the system message is successfully demodulated under the jth frequency point, is successfully demodulated, if so, executing a step S406, otherwise, executing a step S407;
s406, the NB-IoT chip accesses to the candidate access cell in which the system message is successfully demodulated under the jth frequency point;
s407, the NB-IoT chip demodulates the system message of the candidate access cell at the kth frequency point, k is more than or equal to 1 and less than or equal to i, and k is not equal to j;
s408, judging whether the system message of at least one candidate access cell is successfully demodulated under the kth frequency point, if so, executing the step S409; otherwise, step S412 is performed.
S409, the NB-IoT chip demodulates the RRC message of the candidate access cell, wherein the system message under the kth frequency point is successfully demodulated;
s410, judging whether the RRC message of the candidate access cell, of which the system message is successfully demodulated under the kth frequency point, is successfully demodulated; if yes, go to step S411, otherwise go to step S412;
s411, the NB-IoT chip accesses to the candidate access cell in which the system message is successfully demodulated at the kth frequency point;
s412, the NB-IoT chip demodulates the system message of the candidate access cell under at least one residual frequency point;
in step S412, the selection of the remaining frequency point may refer to the selection of the kth frequency point, which is not described in detail again.
The embodiment of the application also provides an NB-IoT chip, and the NB-IoT chip is used for executing the network access method in any embodiment of the application.
The embodiment of the application also provides an NB-IoT terminal, and the NB-IoT terminal is the NB-IoT chip in any embodiment of the application.
The embodiment of the present application further provides a computer storage medium, where a computer executable program is stored in the computer storage medium, and the computer program is used to execute the network access method according to any embodiment of the present application when the computer program is executed.
The practical effects of the optimization of the scheme of the invention are reflected in the improvement of the success rate of network access, the shortening of time delay and the reduction of power consumption. According to the 3GPP protocol, if an NB-IoT chip or a terminal cannot successfully demodulate a system message (MIB/SIB/SI), a current cell is prohibited from being accessed for a period of time; or if the RRC message interpretation fails and the attach procedure cannot be completed completely, reselecting a new cell to reinitiate the demodulation of the system message. The time for attempting to demodulate the system message is implemented by each vendor, and according to the implementation of most vendors, the maximum number of repetitions of attempting to demodulate the system message (MIB/SIB1/SI) is 4. The maximum demodulation time length of the MIB is that the period of 640ms is multiplied by 4 times to be equal to 2560 ms; according to the configuration of the China Mobile network, the repeated scheduling times of the SIB1 in a period 2560ms is 4, that is, the longest demodulation time spent on the SIB1 is 2560ms, which is the time interval 640ms multiplied by 4 for each SIB1 transmission; according to the configuration of the existing network in china, the period of the SI is 640ms, the number of times of scheduling repetition is 3, and the repetition pattern is repeated every 8 radio frames for a total of 80ms, so the demodulation time spent on the SI is 640ms × 3+80ms — 2000 ms. So if the NB-IoT chip or terminal tries to demodulate a cell with a signal characteristic data below the above RSRP difference and SINR difference, the time spent demodulating the system message is about 2560ms +2560ms +2000 ms-7.12 s. If the signal quality is poor or the number of truly existing cells is 3 at a frequency point in the existing network, the time spent by the NB-IoT chip or the terminal at the frequency point is 7.12s by 3 s or 31.36 s.
In summary, when the number of existing network frequency points is 2, the number of poor signal quality or non-truthful cells is 3, and the quality of inter-frequency cell signals is very different, the NB-IoT chip or the terminal can theoretically shorten the attachment delay by 85% (1- (8.5/(31.36 × 2)) ≈ 85%) (assuming that the attachment delay of the NB-IoT chip for normal access to the serving cell is assumed to be 8.5s) if the cell with poor signal quality and non-truthful existence can be excluded. Because the configuration of the existing network is different, the repetition and retransmission times of the RRC message are also different, and when the NB-IoT chip or the terminal attempts to attach to a cell below the demodulation threshold, the theoretical maximum delay of the time delay is not calculated. According to the mobile current network measured data, under the conditions that the density of base stations is high, the same frequency interference is large, the multipath interference and fading exist, and the base station signals at each frequency point are large in difference, compared with the situation that system messages and RRC messages of all searched service cells are directly demodulated without screening, the scheme of the embodiment of the application enables an NB-IoT chip or a terminal to reduce the network access time by about 30%. In addition, the method and the device can effectively exclude the NB-IoT chip or the terminal from the unrealistic cells or the service cells with extremely poor signal quality, and can avoid the NB-IoT chip or the terminal from meaningless trying to access the service cells, thereby reducing the power consumption of the NB-IoT chip or the terminal. In the actual measurement process of the limit condition of the existing network, if the NB-IoT chip or the terminal in the scheme of the application is adopted, the power consumption can be reduced by 70%.
Thus, particular embodiments of the present subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may be advantageous.
It should also 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, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (14)

1. A network access method is applied to an NB-IoT chip and is characterized in that the NB-IoT chip obtains i frequency points through frequency sweep operation, wherein i is more than or equal to 1, and the network access method comprises the following steps:
according to signal characteristic data of a serving cell at the j-th frequency point in the i frequency points, screening the serving cell searched at the j-th frequency point to obtain a candidate access cell, wherein j is more than or equal to 1 and is less than or equal to i, and the signal characteristic data comprises at least one of RSRP and SINR;
the NB-IoT chip demodulates the system message and the RRC message of the candidate access cell under the j frequency point;
if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell under the jth frequency point, the NB-IoT chip accesses to the candidate access cell in which the system message is successfully demodulated under the jth frequency point.
2. The method of claim 1, further comprising:
if the NB-IoT chip does not successfully demodulate the system messages and RRC messages of all the candidate access cells at the jth frequency point, the NB-IoT chip demodulates the system messages and RRC messages of the candidate access cells at the kth frequency point, k is more than or equal to 1 and less than or equal to i, and k is not equal to j;
if the NB-IoT chip successfully demodulates the system message and the RRC message of at least one candidate access cell under the k frequency point, the NB-IoT chip accesses to the candidate access cell in which the system message is successfully demodulated under the k frequency point.
3. The method according to claim 1 or 2, wherein the screening the serving cell searched at the jth frequency point in the i frequency points according to the signal characteristic data of the serving cell at the jth frequency point to obtain the candidate access cell further comprises: determining the RSRP according to a narrowband primary synchronization signal of the NB-IoT chip; and determining the SINR according to the narrowband auxiliary synchronization signal of the NB-IoT chip.
4. The method according to any one of claims 1 to 3, wherein if the signal characteristic data includes RSRP and SINR, the screening the serving cell searched at the j-th frequency point according to the signal characteristic data of the serving cell at the j-th frequency point in the i frequency points to obtain a candidate access cell comprises: screening the service cell under the jth frequency point according to the RSRP to obtain a first access cell; screening the first access cell according to the SINR to obtain the candidate access cell;
or screening the serving cell under the jth frequency point according to the RSRP to obtain a first access cell; screening the service cell under the jth frequency point according to the SINR to obtain a second access cell; and determining the candidate access cells according to the first access cell and the second access cell.
5. The method of claim 4, wherein each serving cell at the jth frequency point corresponds to one RSRP and one SINR, and the screening the serving cells at the jth frequency point according to the RSRP to obtain a first access cell comprises: determining the maximum value of RSRP of all the service cells at the jth frequency point, and screening the service cells at the jth frequency point according to an RSRP difference value to obtain a first access cell, wherein the RSRP difference value is the difference value between the maximum value of the RSRP and an RSRP tolerance value;
the screening the first access cell according to the SINR to obtain the candidate access cell includes: determining the maximum SINR of all service cells at the jth frequency point, and screening the first access cell according to an SINR difference value to obtain the candidate access cell, wherein the SINR difference value is the difference value between the maximum SINR and an SINR tolerance value;
the screening the serving cell under the jth frequency point according to the SINR to obtain a second access cell includes: and screening the service cell under the j frequency point according to an SINR difference value to obtain a second access cell, wherein the SINR difference value is the difference value between the maximum value of the SINR and the SINR tolerance value.
6. The method of claim 5, wherein the screening the serving cell at the jth frequency point according to the RSRP difference value to obtain a first access cell comprises: the service cell with the RSRP value larger than the RSRP difference value under the jth frequency point is taken as the first access cell;
the screening the first access cell according to the SINR difference to obtain the candidate access cell includes: taking the first access cell with the SINR value being greater than or equal to the SINR difference value in the first access cell as the candidate access cell;
the screening the serving cell under the jth frequency point according to the SINR difference to obtain a second access cell includes: and taking the serving cell with the SINR value at the jth frequency point being greater than or equal to the SINR difference value as the second access cell.
7. The method of claim 5 or 6, wherein if the NB-IoT chip fails to demodulate the system messages and RRC messages of all the candidate access cells at the i-frequency point, the method further comprises: and increasing the RSRP tolerance value and the SINR tolerance value to re-screen the serving cell to obtain a new candidate access cell.
8. The method according to any of claims 1-7, wherein when the NB-IoT chip demodulates the system messages and RRC messages of the candidate access cells at the jth frequency point, the system messages and RRC messages of the candidate access cells at the jth frequency point with the highest RSRP value or the highest SINR value are demodulated.
9. The method according to claim 8, wherein the j frequency point is a frequency point which is scanned and detected before the k frequency point.
10. The method according to claim 8, wherein the maximum value of the signal characteristic data in the serving cell at the j-th frequency point is greater than the maximum value of the signal characteristic data in the serving cell at the k-th frequency point.
11. The method of any one of claims 1 to 10, wherein the NB-IoT chip demodulates the system messages and RRC messages of the candidate access cells at the jth frequency point, and comprises:
the NB-IoT chip demodulates the system messages of the candidate access cells under the j frequency point;
and if the demodulation of the system message of at least one candidate access cell exists at the jth frequency point successfully, the NB-IoT chip demodulates the RRC message of the candidate access cell of which the system message at the jth frequency point is successfully demodulated.
12. An NB-IoT chip configured to perform the networking method of any one of claims 1-11.
13. An NB-IoT terminal, wherein the NB-IoT terminal comprises the NB-IoT chip of claim 12.
14. A computer storage medium, characterized in that the computer storage medium stores a computer executable program, which is executed to perform the network entry method of any one of claims 1-11.
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