KR100631592B1 - Network discovery method of multi-band mobile communication terminal - Google Patents

Abstract

According to the present invention, when a terminal supporting GSM multi-band is automatically searched for a network, the network search speed is improved by setting the home network region as the highest priority and the other region as the lower priority to search the network. The present invention relates to a network searching method of a multi-band mobile communication terminal that minimizes current consumption by reducing the use time of the terminal. The method determines a frequency band of a region (home network region) to be first searched from a SIM card in which user information is recorded. Making a step; Scanning the determined frequency band and performing network discovery only for the corresponding band; If a frequency band scan of the first home network region fails, scanning a frequency band of another region; If the frequency band scan of the other region is successful, it may be achieved by including a network search for only the frequency band of the region.

Description

Network discovery method for multi-band mobile communication terminal {NETWORK SEARCHING METHOD FOR MULTI BAND MOBILE STATION}

1 is an exemplary view for explaining an automatic and manual search method using a conventional network search algorithm.

2 is an exemplary diagram for describing an operation of applying a conventional network discovery algorithm in a conventional triple band.

3 is an exemplary view for explaining the operation of the network search algorithm of the quad-band terminal according to the present invention.

4 is a flowchart illustrating a network discovery method of a multi-band mobile communication terminal according to the present invention.

The present invention relates to a network discovery method of a multi-band mobile communication terminal. In particular, when a terminal supporting GSM multi-band is automatically searched for, the home network region is set as the highest priority and the other region is set as the lower priority. The present invention relates to a network search method of a multi-band mobile communication terminal which minimizes current consumption by improving network search speed and reducing use time of a terminal by setting up a network search.

In general, a multi-band terminal refers to a terminal supporting three or more frequency bands, and is a terminal supporting three or more bands among the frequency bands (850 MHz, 900 MHz, 1800 MHz, and 1900 MHz) bands of GSM currently being serviced.

Typically, the terminal finds the network by scanning the cell frequency of the base station. Currently, most terminals are dual band terminals, that is, terminals supporting 900/1800 MHz or 850/1900 MHz as shown in FIG.

Looking at the network discovery process of the 900 / 1800MHz dual-band terminal of the dual-band terminal, first scan the frequency band of the 900MHz band, and then scan the 1800MHz band to find the base station frequency of the region where the current terminal is located, as described above It takes about 30 seconds to scan the dual-band full channel, while the receiver of the RF block is fully active, consuming approximately 70-80mA of current.

On the other hand, there is currently no case in which three or more frequency bands are simultaneously serviced in the same country, but the operation of the existing network discovery algorithm in triple bands or more will be described with reference to the exemplary diagram of FIG.

Figure 2 is an exemplary view for explaining the operation of applying the conventional network search algorithm in the conventional triple band, Figure 2 (a) is a case of a triple band terminal of 900/1800/1900 MHz, when the automatic search Three bands (900/1800/1900 MHz) are found in order, and when the user manually selects the menus, they operate differently according to regions as shown in FIG. That is, only two bands (900/1800 MHz) are found in Europe and only 1900 MHz bands are searched in the United States.

As described above, the conventional network discovery algorithm applies the same operation principle to a terminal supporting all quad bands (850, 900, 1800, 1900 MHz), that is, in case of automatic discovery, all frequency bands are applied. In this case, the manual search searches only the frequency band corresponding to the region set in the menu.

Therefore, the conventional network discovery method has a significant inconvenience for the user in the case of manual selection, and a problem that the mobile user needs to know information about a service band in a corresponding region in advance, and in the case of automatic discovery, Although it is convenient for the user, there is a problem in that current consumption is increased by searching for all unnecessary frequency bands.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and when a terminal supporting GSM multi-band is automatically searched for a network, the home network region is set as the highest priority and other regions are lower priority. It is an object of the present invention to provide a network search method of a multi-band mobile communication terminal which can minimize the current consumption by improving the network search speed and reducing the use time of the terminal by searching the network by setting the ranking.

The present invention for achieving the above object comprises the steps of: determining a frequency band of a region (home network region) to be searched for the first time from a SIM card in which user information is recorded; Scanning the determined frequency band and performing network discovery only for the corresponding band; If a frequency band scan of the first home network region fails, scanning a frequency band of another region; If the frequency band scan of the other region is successful, the method may include performing a network search only for the frequency band of the region.

Currently, the GSM frequency band distribution is serving 900/1800 MHz in Europe / Middle East / Central Asia / Southeast Asia / Africa / Australia, and 850 / 1900MHz in Canada / USA / Latin America, and 900 by user's menu selection. In the 1800 MHz service area, only the 900/1800 MHz band is searched, and the 850/1900 MHz service area is only the 850/1900 MHz band, but in the present invention, by automatically switching the frequency band to perform the search by the user's convenience and current according to the search SUMMARY The present invention provides a method for improving consumption performance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if displayed on different drawings.

Also, in the following description, numerous specific details, such as specific processing flows, are set forth in order to provide a more general understanding of the invention, and it is to be understood that the invention may be practiced without these specific details. It will be obvious to them.

In addition, detailed description of well-known functions and structures which are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

3 is an exemplary view for explaining the operation of the network search algorithm of the quad-band terminal according to the present invention, the European and the United States for the convenience of description.

Typically, the SIM card used in GSM includes subscriber network operator information, telephone number, and the like. In the case of a SIM card of a user subscribed to a European carrier, the SIM card used in the service of Europe is first performed as shown in FIG. Searching the 900/1800 MHz band to find the network means that you are in Europe, so you don't have to look for the 850/1900 MHz band.

In addition, Figure 3 (b) is a case of a terminal subscribed to the U.S. carrier, first search for a network by searching the 850 / 1900MHz band serviced in the United States, the current means that the user is in the United States to search the 900 / 1800MHz band I never do that.

As described above, the frequency band to be searched first is possible by reading the subscription network operator information in the SIM card information.

Next, FIG. 3 (c) shows a case in which a terminal subscribed to a US operator is located in Europe. The terminal first searches for a US regional frequency band (850/1900 MHz) by SIM card information. In this case, all other frequency bands (900/1800 MHz) are searched.

If all of the search for the frequency bands fail, since the service is in a no service area, the search process is repeated according to a preset search period.

4 is a flowchart illustrating a network searching method of a multi-band mobile communication terminal according to the present invention. When the network is started after power is input to the terminal, the frequency band to be searched is first identified from the information recorded in the SIM card. do.

That is, the subscriber network provider information in the SIM card information is read to scan the frequency band of the region to be searched first.

If the first frequency band (eg, 900/1800 MHz) scan is successful, the terminal is located in its own home network area. Therefore, the terminal performs network discovery only for the corresponding band.

If the frequency band scan of the home network region fails for the first time, a scan is performed on a frequency band of another region (for example, 850/1900 MHz), and if the scan is successful, the terminal scans the network only for the corresponding band of the region. Perform.

For example, if the 900 / 1800MHz band scan fails, if the 850 / 1900MHz band scan succeeds, the terminal may determine that it is in another network region.

In other words, since most of the subscribers are usually in their own home network area to which they have initially subscribed to the terminal, the first network search area first searches for the frequency band of the home network area. It succeeds in reducing the time and current consumption of other unnecessary searches.

In addition, even if the user moves to another frequency band region due to a business trip or the like, there is an effect of improving the convenience of the user by automatically searching for the service band of the corresponding region even if the user does not manually set the menu.

As described above, in the present invention, when a terminal supporting GSM multi-band automatically discovers a network, the network is searched by setting the home network region as the highest priority and setting the other region as the lower priority. By improving the search speed and reducing the use time of the terminal, it is possible to minimize the current consumption.

Claims (4)

Determining a frequency band of a region (home network region) to be searched first from a SIM card in which user information is recorded; Scanning the determined frequency band and performing network discovery only for the corresponding band; If a frequency band scan of the first home network region fails, scanning a frequency band of another region; And performing a network search only for the frequency band of the region when the frequency band scan of the other region is successful. The method of claim 1, wherein the first frequency band region (home network region) to be searched is determined by subscribing network operator information in SIM card information. The method of claim 1, wherein if all of the search for the frequency bands for the home network region and other regions have failed, the process of determining that the service is a no service region and repeating the search process at a predetermined search period is performed. Network discovery method of a multi-band mobile communication terminal, characterized in that further comprises. The method of claim 1, wherein the home network region is a region where a user first joins a terminal, and searches for a frequency band of a home network region as a network search region for the first time, thereby increasing the probability of successful network discovery. Network discovery method of a multi-band mobile communication terminal.

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