CN106550431B - UTRAN PLMN searching method - Google Patents
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W48/16—Discovering, processing access restriction or access information
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Abstract
The invention relates to a UTRAN PLMN searching method, comprising the following steps: performing frequency band search to acquire a plurality of UTRAN cells under the current network environment, wherein at least part of the UTRAN cells belong to the same PLMN; performing the following steps for each searched UTRAN cell: reading a master information block MIB of the UTRAN cell and obtaining a PLMN to which the UTRAN cell belongs; judging whether the PLMN is a stored available PLMN, if not, further reading a system information block SIB3 of the UTRAN cell, and if so, skipping the step of reading the system information block SIB3 of the UTRAN cell; after reading the system information block SIB3 of the UTRAN cell, it is determined whether the PLMN is an available PLMN, if so, it is stored in the available PLMN list, otherwise, the PLMN information is discarded.
Description
Technical Field
The invention relates to a method for searching UTRAN PLMN in a UTRAN-type terminal.
Background
UTRAN (UMTS Terrestrial Radio Access Network ) is the most important Access mode for UMTS (Universal Mobile Telecommunications System, which is a generic term for third generation Mobile communication (3G) technology), and has the widest application range. The UTRAN is composed of 3G mobile base stations (NODE B) and Radio Network Controllers (RNC). The UTRAN, the Core Network (CN) and the User Equipment (UE) together form a 3G system.
PLMN (Public Land Mobile Network) is a Network established and operated by the government or its approved operators for the purpose of providing Land Mobile communication services to the Public. In order to use the services of the respective networks, PLMN search needs to be performed.
The UTRAN PLMN search types include a general available PLMN search and a high priority available PLMN search. The general available PLMN search is triggered by the end user in order to inquire which wireless network service operators are under the current network environment, and is called general available PLMN search. By manually triggering the general available PLMN search, according to the PLMN search result, the user can select a proper operator to reside according to the situation to obtain the service. When the terminal finds that the terminal is in a roaming state at this time, in order to obtain a service provided by a PLMN with a high priority, the terminal itself may periodically initiate an available PLMN search, which is referred to as a high priority available PLMN search at this time. According to the search result, if there is an available PLMN with high priority, the terminal will attempt to camp on the PLMN to obtain service.
The PLMN classification includes a general available PLMN and a high priority available PLMN. In the general available PLMN search procedure, the offsets qqualminoffset (utran FDD only) and qrxlevminiffset are not taken into account when calculating the cell S value. If the S value of the cell is greater than 0 and is not BAR, then the PLMN to which the cell belongs is considered to be a general available PLMN. In the high priority available PLMN search, the offsets qqualminoffset (utran FDD only) and qrxlevminioffset obtained from SIB3 are added when calculating the cell S value. If the S value is larger than 0 at the moment, the PLMN to which the cell belongs is considered to be the high priority PLMN.
The system messages to be read for UTRAN PLMN search are: MIB (SB1/SB2), SIB 3. Mib (master Information block) is a master Information block, sib (system Information block) is a system Information block. The purpose of reading the MIB includes obtaining PLMN ID and obtaining SIB3 Scheduling, if not in MIB, SB1/SB2(Scheduling Block) is read for obtaining. The purpose of reading the SIB3 includes (1) calculating the S value by obtaining the cell residence condition information, and judging whether the cell meets the residence condition and whether the current cell is BAR; further judging whether the current cell home PLMN is a general available PLMN or not; (2) the offset values qrxlevminaffset and qqualminoffset (utran FDD only) are taken to calculate the S value, and it is determined whether the current cell home PLMN is a high priority available PLMN.
The current search method in the field, no matter the available PLMN search is general or the available PLMN search with high priority, needs to read the system messages including MIB (SB1/SB2) and SIB3 in turn for all the searched cells. However, with this general search method, unnecessary system message reading may occur, and the time for UTRAN PLMN search is prolonged.
Disclosure of Invention
The present invention is directed to provide a UTRAN PLMN search method for shortening the time for UTRAN PLMN search by reducing unnecessary system message reading.
The technical scheme adopted by the invention for solving the technical problems is a UTRAN PLMN searching method, which comprises the following steps: performing frequency band search to acquire a plurality of UTRAN cells under the current network environment, wherein at least part of the UTRAN cells belong to the same PLMN; performing the following steps for each searched UTRAN cell: reading a master information block MIB of the UTRAN cell and obtaining a PLMN to which the UTRAN cell belongs; judging whether the PLMN is a stored available PLMN, if not, further reading a system information block SIB3 of the UTRAN cell, and if so, skipping the step of reading the system information block SIB3 of the UTRAN cell; after reading the system information block SIB3 of the UTRAN cell, it is determined whether the PLMN is an available PLMN, if so, it is stored in the available PLMN list, otherwise, the PLMN information is discarded.
In an embodiment of the present invention, the available PLMNs include a general available PLMN and a high priority available PLMN.
In an embodiment of the present invention, when the available PLMN is a high priority available PLMN, the step of determining that the PLMN is a stored available PLMN is followed by the step of determining whether the stored available PLMN is a high priority available PLMN, if not, further reading the system information block SIB3 of the UTRAN cell, and if so, skipping the step of reading the system information block SIB3 of the UTRAN cell.
In an embodiment of the present invention, a method for determining whether the PLMN is an available PLMN includes:
calculating the S value of the current cell and whether the current cell is a forbidden cell by reading the system information block SIB 3; if the S value is greater than 0 and is not barred, the PLMN is an available PLMN, otherwise the PLMN is not an available PLMN.
In an embodiment of the present invention, the frequency band search is performed in the physical layer.
In an embodiment of the present invention, a PLMN search is initiated in the access stratum, and the physical layer is instructed to perform the frequency band search.
In an embodiment of the present invention, in response to a user-triggered search for an available PLMN, the non-access stratum layer notifies the access stratum layer to initiate the PLMN search.
The present invention further provides a UTRAN PLMN searching apparatus, which includes: the first module is used for searching frequency bands and acquiring a plurality of UTRAN cells under the current network environment, wherein at least part of the UTRAN cells belong to the same PLMN; a second module, configured to perform the following steps for each searched UTRAN cell: reading a master information block MIB of the UTRAN cell and obtaining a PLMN to which the UTRAN cell belongs; judging whether the PLMN is a stored available PLMN, if not, further reading a system information block SIB3 of the UTRAN cell, and if so, skipping the step of reading the system information block SIB3 of the UTRAN cell; after reading the system information block SIB3 of the UTRAN cell, it is determined whether the PLMN is an available PLMN, if so, it is stored in the available PLMN list, otherwise, the PLMN information is discarded.
In an embodiment of the present invention, the available PLMNs include a general available PLMN and a high priority available PLMN.
In an embodiment of the invention, when the available PLMN is a high priority available PLMN, the second module further determines whether the stored available PLMN is a high priority available PLMN after the step of determining that the PLMN is the stored available PLMN, and further reads the system information block SIB3 of the UTRAN cell if the stored available PLMN is not the high priority available PLMN, and skips the step of reading the system information block SIB3 of the UTRAN cell if the stored available PLMN is the high priority available PLMN.
Compared with the prior art, the invention has the advantages that the time for searching the UTRAN PLMN can be greatly shortened and the power consumption of the terminal can be reduced under the network environment jointly covered by a plurality of UTRAN cells belonging to the same PLMN on the basis of not influencing the searching effect of the existing UTRAN PLMN.
Drawings
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, wherein:
fig. 1 shows a flow of a UTRAN PLMN search method according to an embodiment of the present invention.
Fig. 2 shows a general procedure for UTRAN PLMN search that is available according to an embodiment of the present invention.
Fig. 3 illustrates a flow of a high priority available UTRAN PLMN search in accordance with one embodiment of the present invention.
Detailed Description
In the general PLMN search method in the art, system message reading, including MIB (SB1/SB2) and SIB3, needs to be performed in sequence for all searched cells. However, in a real network environment, one operator (UTRAN PLMN fixed) usually deploys a plurality of UTRAN cells in a certain area. It is not necessary for multiple UTRAN cells belonging to the same PLMN to read SIB3 repeatedly.
The embodiment of the invention provides a UTRAN PLMN searching method, which shortens the time of UTRAN PLMN searching by reducing unnecessary system message reading. The UTRAN PLMN searching method is executed in a mobile terminal supporting UTRAN system. Examples of mobile terminals include, but are not limited to, cell phones, tablets, laptops, wearable devices.
Fig. 1 shows a flow of a UTRAN PLMN search method according to an embodiment of the present invention. Referring to fig. 1, the method comprises the steps of:
in step 101, a frequency band search is performed to obtain a plurality of UTRAN cells in the current network environment. Here, at least a part of the UTRAN cells belong to the same PLMN.
Here, the searched frequency band may be selected according to specific situations, for example, the frequency band is the whole frequency band, or the frequency band that the mobile terminal can support, or the frequency band allowed by the current network environment, etc.
Performing the following steps for each searched UTRAN cell:
in step 102, the master information block MIB of the UTRAN cell is read and the PLMN to which the UTRAN cell belongs is obtained.
In step 103, determining whether the PLMN is a stored available PLMN, if not, proceeding to step 104, if yes, skipping step 104, and proceeding directly to step 107;
in step 104, reading a system information block SIB3 of the UTRAN cell;
in step 105, judging whether the PLMN is an available PLMN according to the information acquired from the SIB3, if so, entering step 106, otherwise, discarding the PLMN information, and entering step 107;
at step 106, storing the PLMN in a list of available PLMNs;
in step 107, it is determined whether there are cells remaining to be searched, if yes, step 102 is entered, otherwise, step 108 is entered.
The search round is ended in step 108, and all available PLMNs searched for may be aggregated.
According to the embodiment, in the search process of the UTRAN PLMN, whether the cell home PLMN is an available PLMN is judged by reading the cell system message MIB and the SIB 3; if so, the available PLMN is stored. Subsequently, if other cells belonging to the stored available PLMN are searched, the PLMN can be judged to be the stored available PLMN only by reading the MIB to acquire the PLMN; at this time, the SIB3 of the cell does not need to be read; if a cell belonging to other PLMN is searched, the reading of the cell SIB3 is continued. In contrast, in the conventional search method in the art, although the available PLMNs can be determined and obtained by reading the system messages MIB (SB1/SB2) and SIB3 of the previously searched UTRAN cell and the next UTRAN cell can obtain its home PLMN by reading the MIB, i.e., it can be determined whether the PLMN is already an available PLMN that has been previously read and stored, the method unnecessarily reads the SIB3 of the cell. Therefore, the present embodiment reduces unnecessary system message reading (SIB3) by using the search method commonly used in the art, thereby shortening the duration of UTRAN PLMN search and reducing the power consumption of the terminal.
The UTRAN PLMN search types include a general available PLMN search and a high priority available PLMN search. The general available PLMN search is triggered by the end user in order to inquire which wireless network service operators are under the current network environment, and is called general available PLMN search. By manually triggering the general available PLMN search, according to the PLMN search result, the user can select a proper operator to reside according to the situation to obtain the service. When the terminal finds that the terminal is in a roaming state at this time, the terminal itself periodically initiates an available PLMN search, which is called a high-priority available PLMN search, in order to obtain a service provided by a high-priority PLMN. According to the search result, if there is an available PLMN with high priority, the terminal will attempt to camp on the PLMN to obtain service.
The following will describe embodiments of the present invention as applied to examples of generally available UTRAN PLMN searches and high priority available UTRAN PLMN searches, respectively.
Fig. 2 shows a general procedure for UTRAN PLMN search that is available according to an embodiment of the present invention. Referring to fig. 2, the flow is as follows:
in step 201, in response to the user triggering the available PLMN search, the non-access stratum layer notifies the access stratum layer to initiate a general available PLMN search procedure.
In step 202, the access layer records that the current search is a general available PLMN search and instructs the physical layer to perform a frequency band search.
In step 203, the physical layer performs frequency band search and reports to the access layer.
In step 204, the access layer, according to the search result reported by the physical layer, if no cell is searched, or all the searched cells have been read, then the PLMN search in this round is ended in step 211; otherwise step 205 is performed.
In step 205, a system message MIB is read for the searched cell, and the current cell home PLMN is obtained by reading the MIB.
In step 206, the available PLMN list is queried to determine whether the PLMN already exists; if so, perform step 210; otherwise, step 207 is performed.
In step 207, cell system information SIB3 is read.
In step 208, it is determined whether the PLMN is a valid available PLMN by reading the information from the SIB3, and if the PLMN is an available PLMN, step 209 is entered. Otherwise, the cell PLMN information is discarded, etc., and then step 210 is entered.
Here, the method of determining whether the PLMN is a valid available PLMN by reading information from the SIB3 is, for example, calculating the S value of the current cell and whether it is a Barred (BAR) cell; if the S value is greater than 0 and is not barred, the cell home PLMN is an available PLMN.
The PLMN is stored in a general available PLMN list in step 209.
In step 210, it is determined whether there are any cells to be searched, if yes, step 205 is returned, otherwise step 211 is returned.
In step 211, the round of search is ended, and all the searched general available PLMNs are collected and reported to the non-access stratum.
Fig. 3 illustrates a flow of a high priority available UTRAN PLMN search in accordance with one embodiment of the present invention. Referring to the figure, the flow is as follows:
in step 301, in the roaming state, in response to the terminal autonomously triggering a high-priority PLMN search, the non-access stratum notifies the access stratum to initiate a high-priority available PLMN search procedure.
In step 302, the access layer records that the current search is a high priority PLMN search available and instructs the physical layer to perform a frequency band search.
In step 303, the physical layer performs frequency band search and reports to the access layer.
In step 304, the access layer, according to the search result reported by the physical layer, if no cell is searched, or all the searched cells have been read, ends the PLMN search in this round in step 314, otherwise executes step 305.
In step 305, reading a system message MIB of the searched cell, and obtaining a home PLMN of the current cell by reading the MIB.
In step 306, the available PLMN list is queried to determine whether the PLMN already exists; if not, go to step 308; if so, go to step 307.
In step 307, it is determined whether the PLMN is a high priority available PLMN, and if not, step 308 is performed, and if it is a high priority available PLMN, step 313 is performed.
In step 308, cell system information SIB3 is read.
In step 309, it is determined whether the PLMN is a valid available PLMN by reading the information from the SIB3, and if the PLMN is an available PLMN, step 310 is entered. Otherwise, the cell PLMN information is discarded, etc., and then step 313 is entered.
Here, the method of determining whether the PLMN is a valid available PLMN by reading information from the SIB3 is, for example, calculating the S value of the current cell and whether it is a Barred (BAR) cell; if the S value is greater than 0 and is not barred, the cell home PLMN is an available PLMN.
In step 310, it is determined whether the available PLMN is a high priority available PLMN, if so, step 311 is entered, otherwise, step 312 is entered.
Here, the method of determination is, for example, to obtain the offsets qqualminoffset (utran FDD only) and qrxlevminaffset from SIB3, and to take the offsets into account when recalculating the current cell S value; and if the S value is still larger than 0 at the moment, marking the available PLMN as the high-priority available PLMN.
At step 311, the PLMN is stored in the advanced PLMN list.
At step 312, the PLMN is stored in a general available PLMN list.
In step 313, it is determined whether there are any cells remaining to be searched, if yes, step 305 is returned, otherwise step 314 is entered.
In step 314, the round of search is ended, and all searched high-priority available PLMNs are collected and reported to the non-access stratum.
The UTRAN PLMN searching method according to the above-described embodiments of the present invention can be implemented in a computer readable medium such as computer software, hardware, or a combination of computer software and hardware. For a hardware implementation, the embodiments described herein may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), digital signal processing devices (DAPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic devices designed to perform the functions described herein, or a selected combination thereof. In some cases, such embodiments may be implemented by a controller.
For a software implementation, the embodiments described herein may be implemented by separate software modules, such as program modules (procedures) and function modules (functions), each of which performs one or more of the functions and operations described herein. The software codes may be implemented by application software written in a suitable programming language, and may be stored in a memory and executed by a controller or processor. For example, the UTRAN PLMN searching apparatus according to the embodiment of the present invention may include a plurality of program modules, such as a first module and a second module. The first module is used for searching frequency bands and acquiring a plurality of UTRAN cells under the current network environment, wherein at least part of the UTRAN cells belong to the same PLMN. The second module is configured to perform the following steps for each searched UTRAN cell: reading a master information block MIB of the UTRAN cell and obtaining a PLMN to which the UTRAN cell belongs; judging whether the PLMN is a stored available PLMN, if not, further reading a system information block SIB3 of the UTRAN cell, and if so, skipping the step of reading the system information block SIB3 of the UTRAN cell; and after reading the system information block SIB3 of the UTRAN cell, judging whether the PLMN is an available PLMN, if so, storing the PLMN in an available PLMN list, otherwise, discarding the PLMN information.
Although the present invention has been described with reference to the present specific embodiments, it will be appreciated by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the invention, and therefore, changes and modifications to the above embodiments within the spirit of the invention are intended to fall within the scope of the claims of the present application.
Claims (6)
1. A UTRAN PLMN searching method comprising the steps of:
performing frequency band search to acquire a plurality of UTRAN cells under the current network environment, wherein at least part of the UTRAN cells belong to the same PLMN;
performing the following steps for each searched UTRAN cell:
reading a master information block MIB of the UTRAN cell and obtaining a PLMN to which the UTRAN cell belongs;
judging whether the PLMN is a stored available PLMN, if not, further reading a system information block SIB3 of the UTRAN cell, and if so, skipping the step of reading the system information block SIB3 of the UTRAN cell;
after reading a system information block SIB3 of the UTRAN cell, judging whether the PLMN is an available PLMN or not according to the result, if so, storing the PLMN in an available PLMN list, otherwise, discarding the PLMN information;
wherein, the available PLMNs include a general available PLMN and a high priority available PLMN, and when the available PLMN is the high priority available PLMN, after the step of determining that the PLMN is the stored available PLMN, the method further includes the steps of determining whether the stored available PLMN is the high priority available PLMN, if not, further reading a system information block SIB3 of the UTRAN cell, and if so, skipping reading a system information block SIB3 of the UTRAN cell.
2. The method of claim 1, wherein the determining whether the PLMN is an available PLMN comprises:
calculating the S value of the current cell and whether the current cell is a forbidden cell by reading the system information block SIB 3; if the S value is greater than 0 and is not barred, the PLMN is an available PLMN, otherwise the PLMN is not an available PLMN.
3. The method of claim 1, wherein the frequency band search is performed at a physical layer.
4. The method of claim 3, wherein a PLMN search is initiated at an access stratum layer, instructing the physical layer to perform the band search.
5. The method of claim 4, wherein the access stratum is notified by a non-access stratum to initiate the PLMN search in response to a user-triggered search for an available PLMN.
6. A UTRAN PLMN searching apparatus, comprising:
the first module is used for searching frequency bands and acquiring a plurality of UTRAN cells under the current network environment, wherein at least part of the UTRAN cells belong to the same PLMN;
a second module, configured to perform the following steps for each searched UTRAN cell:
reading a master information block MIB of the UTRAN cell and obtaining a PLMN to which the UTRAN cell belongs;
judging whether the PLMN is a stored available PLMN, if not, further reading a system information block SIB3 of the UTRAN cell, and if so, skipping the step of reading the system information block SIB3 of the UTRAN cell;
after reading a system information block SIB3 of the UTRAN cell, judging whether the PLMN is an available PLMN or not according to the result, if so, storing the PLMN in an available PLMN list, otherwise, discarding the PLMN information;
wherein, the available PLMNs include a general available PLMN and a high priority available PLMN, and when the available PLMN is the high priority available PLMN, the second module further determines whether the stored available PLMN is the high priority available PLMN after the step of determining that the PLMN is the stored available PLMN, and if not, further reads the system information block SIB3 of the UTRAN cell, and if so, skips the step of reading the system information block SIB3 of the UTRAN cell.
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| CN1960570A (en) * | 2006-11-16 | 2007-05-09 | 重庆重邮信科股份有限公司 | Search technique of quickening initial search speed of sector |
| CN101513104A (en) * | 2006-08-31 | 2009-08-19 | 高通股份有限公司 | Efficient search for wireless networks while minimizing page loss |
| CN101707783A (en) * | 2009-06-30 | 2010-05-12 | 重庆重邮信科通信技术有限公司 | Method for searching high priority network by user terminal of third generation mobile communication system |
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| US6628946B1 (en) * | 1999-05-20 | 2003-09-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for broadcasting system information in a cellular communications network |
| KR100914882B1 (en) * | 2007-04-02 | 2009-08-31 | 삼성전자주식회사 | Method for searching of network in wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101513104A (en) * | 2006-08-31 | 2009-08-19 | 高通股份有限公司 | Efficient search for wireless networks while minimizing page loss |
| CN1960570A (en) * | 2006-11-16 | 2007-05-09 | 重庆重邮信科股份有限公司 | Search technique of quickening initial search speed of sector |
| CN101707783A (en) * | 2009-06-30 | 2010-05-12 | 重庆重邮信科通信技术有限公司 | Method for searching high priority network by user terminal of third generation mobile communication system |
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