CN1949907A - Mobile terminal and network searching method thereof - Google Patents

Abstract

The invention relates to wireless communication technology, and discloses a mobile terminal and a network search method thereof, so that mobile terminals supporting multiple frequency bands can quickly and successfully register on the network. In the present invention, the corresponding relationship between the network number and the frequency band is pre-saved in the mobile terminal. When the mobile terminal needs to register the network, according to the network number to be searched and the corresponding relationship, the frequency band corresponding to the network number is queried. Search for the network within the frequency band. Wherein, the network number to be searched is the network number of the network successfully logged in last time, or the network number of the mobile communication operator corresponding to the SIM card of the mobile terminal. Record the network number of the mobile communication operator according to the classification of the frequency bands supported by the mobile communication operator. If the mobile terminal does not find the corresponding frequency band, the mobile terminal searches for the network in all the frequency bands it supports.

Description

Mobile terminal and its network search method

technical field

The invention relates to wireless communication technology, in particular to network search technology for mobile terminals.

Background technique

With the rapid development and popularization of communication technologies, mobile phones and the data services they provide have increasingly changed people's lives and work. At the same time, in response to the needs of the market, operators have developed various mobile cellular networks with their own characteristics according to the different needs of users. Currently, the Global System for Mobile Communication (Global System for mobile Communication, referred to as "GSM") is widely used. , General Packet Radio Service (GPRS for short), Wideband Code Division Multiple Access (WCDMA for short), Code Division Multiple Access (CDMA for short) wait. Each network can overlap and cover the same area, using their own frequency bands for communication. The currently used frequency bands are 800M frequency band, 900M frequency band and 1800M frequency band. Some of the various networks use the 800M frequency band, some use the 900/1800M frequency band, and some use the 800M/900M/1800M frequency band. Correspondingly, most of the current mobile terminals, represented by mobile phones, can support these three frequency bands. No matter which frequency band is inserted into the SIM card (subscriber identification card) of the operator, it can be registered to the frequency band. online. Of course, for mobile phones that support multiple frequency bands, the requirements for network search functions and performance are higher than those for mobile phones that only support a single frequency band. In order to ensure that the mobile phone can successfully register with the network after inserting SIM cards belonging to different frequency bands and different operators, there are currently multiple implementation solutions.

The first solution is to only search for a single frequency band. The specific frequency band to be searched can be configured in three ways: directly execute the AT command, or select through the mobile phone menu, or type a combination of keys through the mobile phone keyboard. In essence, selecting which frequency band to search through the menu, or typing a series of key combinations on the keyboard of the mobile phone, in fact, ultimately calls the AT command for setting the frequency band at the bottom layer. After the search frequency band is set, the mobile phone will only search for this single frequency band forever. When using the mobile phone, the user needs to use a SIM card that belongs to this frequency band. Only when a SIM card belonging to this frequency band is inserted, the mobile phone can successfully register on the network; if a SIM card other than this frequency band is inserted, the mobile phone will fail to register the network when starting up. In this case, you need to set the search frequency band of the mobile phone to Resetting to the frequency band corresponding to the SIM card can successfully search and access the network. It can be seen that this solution is very inconvenient to use. If the user wants to move between networks supporting different frequency bands, he must change the settings synchronously and replace the corresponding SIM card.

In the second technical solution of the prior art, the mobile phone supports searching for two frequency bands, and when the inserted SIM card belongs to the two frequency bands, it can successfully register on the network. For example, the SAGEM mobile phone can support the search of two frequency bands of 800M and 1800M. Compared with the first solution, this solution has a larger search range and is more practical, but it also has its shortcomings. For example, there are only 900M signals in the suburbs or rural areas. In other regions, this kind of mobile phone will not be able to register on the network, and there is still the possibility of being disconnected from the network.

In order to minimize the possibility of network disconnection, in the existing technology 3, the mobile phone can support searching all frequency bands, so that the mobile phone does not need to set a specific frequency band, and no matter which frequency band the inserted SIM card is, it can Successfully registered on the network. In this solution, the mobile phone searches one by one according to the strength of the frequency signal. When searching the network, the frequency point with the strongest signal will be synchronized first, and search one by one according to the strength of the signal until the frequency band that matches the SIM card is found. or timeout. In this solution, if the signal of the frequency band corresponding to the SIM card is weak, then according to the one-by-one search principle, the frequency point corresponding to the SIM card will be synchronized later, which will slow down the speed of mobile phone registration to the network. What's more serious is that when entering an area with a signal from a no-signal area, if the signal of the frequency band corresponding to the SIM card is weak, then the mobile phone will give priority to synchronizing with the frequency points with stronger signals in other frequency bands. There is a time limit, so it is possible that the search will end due to the timeout of the search network before the frequency point of the corresponding frequency band of the SIM card can be synchronized, which will lead to the failure of the search network. It can be seen that there will be a period of If you cannot re-register to the network, you cannot re-register to the network until you enter an area with a strong signal.

Contents of the invention

The main technical problem to be solved by the present invention is to provide a mobile terminal and its network search method, so that mobile terminals supporting multiple frequency bands can quickly and successfully register on the network.

In order to solve the above technical problems, an embodiment of the present invention provides a network search method for a mobile terminal, comprising the following steps:

Save the corresponding relationship between the network number and the frequency band in the mobile terminal in advance;

When the mobile terminal needs to register the network, it queries the frequency band corresponding to the network number according to the network number to be searched and the corresponding relationship;

If the mobile terminal finds a corresponding frequency band, it searches for a network within the frequency band.

Embodiments of the present invention also provide a mobile terminal, including:

The storage module is used to store the corresponding relationship between the network number and the frequency band in advance;

The query module is used to query the frequency band corresponding to the network number according to the network number to be searched and the corresponding relationship when the network needs to be registered;

The search module is configured to search for a network within the frequency band when the corresponding frequency band is found.

Through comparison, it can be found that the main difference between the technical solution of the present invention and the prior art is that the corresponding relationship between network numbers and frequency bands is pre-saved in the mobile terminal. For the corresponding relationship, the frequency band corresponding to the network number is queried, and the network is searched in the found frequency band. Wherein, the network number to be searched is the network number of the network successfully logged in last time, or the network number of the mobile communication operator corresponding to the SIM card of the mobile terminal. It enables mobile terminals that support multiple frequency bands to automatically identify the frequency band corresponding to the currently inserted SIM card, and search for the network in this frequency band, thereby quickly and successfully registering on the network, which solves the time limit of the search process. There is a problem that the frequency point corresponding to the frequency band corresponding to the SIM card can be synchronized in time, but the network search fails due to timeout.

Since the network numbers of the mobile communication operators to which they belong and their corresponding frequency bands are known, the corresponding relationship stored in the mobile terminal is the corresponding relationship between the network numbers of the mobile communication operators to which they belong and their corresponding frequency bands. It provides a basis for the realization of the present invention.

Record the network number of the mobile communication operator according to the frequency band classification supported by the mobile communication operator. For example, the frequency band supported by the mobile communication operator is divided into 800M, 900M/1800M, and 800M/900M/1800M, then in the network number file Operators that support 800M are counted as one category, operators that support 900M/1800M are counted as one category, and operators that support 800M/900M/1800M are counted as one category. The mobile terminal saves the corresponding relationship effectively and simply by storing the network number file that records the network numbers classified by frequency bands.

If the mobile terminal does not find the corresponding frequency band, the mobile terminal searches for the network in all the frequency bands it supports, so that the SIM card regardless of the known frequency band or the unknown frequency band can successfully register on the network.

The mobile terminal queries, adds, or deletes the stored corresponding relationship through the AT command, and realizes the maintenance of the corresponding relationship.

Description of drawings

FIG. 1 is a structural diagram of a mobile terminal system according to a preferred embodiment of the present invention;

Fig. 2 is a flowchart of a network search method for a mobile terminal according to a preferred embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

In the present invention, the corresponding relationship between the network number and the frequency band is stored in the mobile terminal in advance. When the mobile terminal needs to register the network, according to the network number to be searched and the corresponding relationship, the frequency band corresponding to the network number is queried. Search the network in the frequency band you want. Wherein, the network number to be searched is the network number of the network successfully logged in last time, or the network number of the mobile communication operator corresponding to the SIM card of the mobile terminal. It enables mobile terminals that support multiple frequency bands to automatically identify the frequency band corresponding to the currently inserted SIM card, and search for the network in this frequency band, thereby quickly and successfully registering on the network, which solves the time limit of the search process. There is a problem that the frequency point corresponding to the frequency band corresponding to the SIM card can be synchronized in time, but the network search fails due to timeout.

A preferred implementation mode of the present invention will be described below. This implementation mode relates to a mobile terminal and a network search method for the mobile terminal.

As shown in Figure 1, the mobile terminal at least includes a storage module, a query module, a search module and a maintenance module. Wherein, the storage module is used to pre-save the corresponding relationship between the network number and the frequency band; the query module is used to query the frequency band corresponding to the network number according to the network number to be searched and the corresponding relationship when the mobile terminal needs to register the network ; The search module is used to search the network in the frequency band when the corresponding frequency band is found, and search the network in all the frequency bands supported by the mobile terminal when the corresponding frequency band is not found; the maintenance module is used to pass the AT command Query, add, or delete the corresponding relationship between network numbers and frequency bands. Through the cooperation between the above modules, the mobile terminal supporting multiple frequency bands can automatically identify the frequency band corresponding to the currently inserted SIM card, search for the network in this frequency band, thereby quickly and successfully register on the network, and solve the problem caused by network search. The time limit of the process, before the frequency point of the frequency band corresponding to the SIM card can be synchronized, the network search fails due to timeout. Wherein, the stored corresponding relationship is the corresponding relationship between the network numbers of each mobile communication operator and its corresponding frequency band, and the storage module saves these corresponding relationships through the network number file. The network number of the communication carrier. Since the mobile communication operator's network number and its corresponding frequency band are known, no additional investigation is required, so it is very convenient to implement.

The structure of the mobile terminal in this embodiment has been briefly introduced above, and the network search method of the mobile terminal will be described below.

As shown in Figure 2, in this method, a network number file needs to be set in the mobile terminal, and the corresponding relationship between the network numbers of the respective mobile communication operators and their corresponding frequency bands is stored in the network number file in advance. The network numbers of each mobile communication operator can be classified and recorded according to the frequency bands supported by the mobile communication operators in the country or region where the mobile terminal is sold, and the network number file that records the network numbers according to the frequency band classification can be stored in the mobile terminal, and the corresponding network number can be saved. corresponding relationship.

When saving the corresponding relationship, only the network numbers of the corresponding mobile communication operators in the frequency bands supported by the mobile terminal may be considered. Since in practical applications, most mobile terminals can support all existing frequency bands, this will not affect the present invention.

The following is an example to briefly explain the setting of the network number file. For example, the mobile terminal can support the three frequency bands of 800M/900M/1800M. In the country where the mobile terminal is sold, the frequency bands supported by mobile communication operators are roughly divided into: 800M . Operators are counted as one category, and the network numbers are classified and recorded in the network number file according to the frequency bands supported by the mobile communication operators, so as to effectively and simply save the corresponding relationship.

In actual implementation, the network number file can be designed to store 36 network numbers, the first 12 network numbers store the network numbers of the 800M operators recognized by the country, and the middle 12 network numbers store the nationally recognized 900M/1800M network numbers number, the last 12 network numbers store the nationally recognized 800M/900M/1800M dual-frequency network numbers. The structure of the network number file is shown in Table 1:

12 network numbers of 800M

12 network numbers of 900M/1800M

12 network numbers of 800M/900M/1800M

Table 1

According to the structure shown in Table 1, the mobile terminal can easily find the frequency band to be searched according to the network number.

When the mobile terminal needs to register the network, it enters step 201, and searches for the frequency band corresponding to the network number according to the network number to be searched and the corresponding relationship stored in the network number file. Wherein, the network number to be searched is the network number of the network successfully logged in last time, or the network number of the mobile communication operator corresponding to the SIM card of the mobile terminal. If the network number to be searched is one of the first 12 network numbers, it can be determined that the frequency band to be searched is 800M.

If the mobile terminal finds the frequency band corresponding to the network number it needs to search from the network number file, then enters step 202, if not found, then enters step 203.

Since the mobile terminal finds the frequency band corresponding to the network number it needs to search, in step 202, the mobile terminal searches for a network within the found corresponding frequency band. Since the mobile terminal supporting three frequency bands can automatically search for the frequency band corresponding to the currently inserted SIM card, and search for the network in the corresponding frequency band, the mobile terminal can quickly and successfully register on the network, thereby avoiding the need to search for the network. The time limit of the process, when the frequency point of the frequency band corresponding to the SIM card has not been synchronized in time, the network search fails due to timeout. In addition, the mobile terminal can be set to only search for the corresponding frequency band, so that when the mobile terminal needs to register the network later, it can directly determine the search frequency band without searching for the network number file, further speeding up the network access speed of the mobile terminal.

In step 203, since the mobile terminal does not find the frequency band corresponding to the network number it needs to search, the mobile terminal searches the network one by one in all the frequency bands it supports, and the specific search method is the same as the prior art, so that no matter SIM cards with known frequency bands or unknown frequency bands can successfully register with the network.

In addition, in order to ensure that the corresponding relationship in the network number file can be synchronized with the actual changes of the network, it is necessary to maintain the existing network number file. The network number can be read, added, and deleted through AT commands, such as the new AT command "AT+PLMN", which is used to read, add or delete 800M, 900M/1800M or 800M/900M to the network number file /1800M dual frequency network number. The specific format of the command is as follows:

at+plmn=<mode>, <type>, "number" modify network number file

at+plmn? Query the set network number

Operation mode mode: 1 increase

          0   Delete

Network number type type: 0 pure 800 network

          1  Pure 900/1800 mesh

                                                       

Network number number: 5 to 6 digits, for example, the network number of China Mobile is "46000"

Specific examples:

at+plmn=1, 0, "46007" can add 800M network number 46007; Note: The card used for testing is the card with HPLMN 46007

at+plmn=1, 1, "46000" can add 900M network number 46000;

at+plmn=0, 0, "46007" can delete the network number 46007 of 800M;

at+plmn=0, 1, "46000" can delete the network number 46000 of 900M;

at+plmn? You can query all the set network numbers in the network number file, and list these network numbers according to different frequency bands.

Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present invention. The spirit and scope of the invention.

Claims (11)

1. the network search method of a portable terminal is characterized in that, comprises following steps:

In portable terminal, preserve the corresponding relation of network No. and frequency range in advance;

Portable terminal according to the network No. and the described corresponding relation of need search, is inquired about the pairing frequency range of this network No. when the needs registered network;

If described portable terminal finds the frequency range of described correspondence, search network in this frequency range then.

2. the network search method of portable terminal according to claim 1 is characterized in that, the described network No. that needs to search for is the network No. of the preceding network that once successfully lands, or the network No. of the pairing mobile communication carrier of described mobile terminal user identification card.

3. the network search method of portable terminal according to claim 1 is characterized in that, the corresponding relation of described preservation is the network No. of mobile communication carrier of each ownership and the corresponding relation of its corresponding band.

4. the network search method of portable terminal according to claim 3, it is characterized in that, network No. according to the described mobile communication carrier of the frequency range book of final entry that mobile communication carrier supported, described portable terminal is preserved described corresponding relation by the described network No. file by frequency range book of final entry network No. of storage.

5. according to the network search method of each described portable terminal in the claim 1 to 4, it is characterized in that, also comprise following steps:

If described portable terminal does not inquire the frequency range of described correspondence, this portable terminal search network in all frequency ranges of its support then.

6. according to the network search method of each described portable terminal in the claim 1 to 4, it is characterized in that described portable terminal is by AT order inquiry, increase or delete described corresponding relation.

7. a portable terminal is characterized in that, comprises:

Memory module is used for preserving in advance the corresponding relation of network No. and frequency range;

Enquiry module is used for when the needs registered network, according to the network No. and the described corresponding relation of need search, inquires about the pairing frequency range of this network No.;

Search module is used for when finding the frequency range of described correspondence search network in this frequency range.

8. portable terminal according to claim 7 is characterized in that, the described network No. that needs to search for is the network No. of the preceding network that once successfully lands, or the network No. of the pairing mobile communication carrier of described mobile terminal user identification card.

9. portable terminal according to claim 8, it is characterized in that, the corresponding relation of described preservation is the network No. of mobile communication carrier of each ownership and the corresponding relation of its corresponding band, described memory module is preserved described corresponding relation by storage network No. file, and this network No. file is according to the network No. of the described mobile communication carrier of the frequency range book of final entry that mobile communication carrier supported.

10. according to each described portable terminal in the claim 7 to 9, it is characterized in that described search module also is used for when not finding the frequency range of described correspondence, search network in all frequency ranges that this portable terminal is supported.

11. according to each described portable terminal in the claim 7 to 9, it is characterized in that described portable terminal also comprises maintenance module, be used for inquiring about, increase or delete described corresponding relation by the AT order.