WO2014081272A1

WO2014081272A1 - Communication network setting method of wireless communication terminal

Info

Publication number: WO2014081272A1
Application number: PCT/KR2013/010806
Authority: WO
Inventors: 심재욱; 방지훈; 이연복; 양호
Original assignee: 삼성전자 주식회사
Priority date: 2012-11-26
Filing date: 2013-11-26
Publication date: 2014-05-30

Abstract

According to a communication network setting method of a wireless communication terminal, wireless communication can be performed with a communication network by reading in advance features related to a communication standard or a communication provider for recognizing a wireless communication network accessible at a current place, detecting features from a wireless communication signal received at the current place, and then setting a modem in a hardware or software scheme according to the features.

Description

Communication network setting method of wireless communication terminal

The following embodiments relate to a method of setting up a communication network of a wireless communication terminal, and to a method of setting up a communication network by detecting a feature corresponding to a communication standard and a carrier from an externally received wireless communication signal.

Currently, wireless communication technologies corresponding to various communication standards are used for voice communication and data communication around the world. In general, a wireless communication terminal can support a plurality of communication standards for wireless communication.

To this end, the wireless communication terminal may include a modem corresponding to each of the plurality of communication standards. Here, the modem may be implemented in hardware. However, since the wireless communication terminal does not actually use all the modems for wireless communication, an increase in the cost of the terminal, an increase in the volume of the terminal, and power consumption due to an unused modem may occur.

On the other hand, the wireless communication terminal may implement a modem in software. Specifically, the wireless communication terminal can quickly process mathematical operations corresponding to a plurality of communication standards through one or a plurality of processors with one modem. That is, the wireless communication terminal may control a modem to operate as a modem corresponding to a communication standard of a communication network to which the modem is currently connected among a plurality of communication standards through a software implementation. At this time, the computation processing associated with the processor of the modem may be appropriately determined according to the number of communication standards that must operate simultaneously with the communication standard for wireless communication.

When a wireless communication terminal that implements a modem in hardware or software is located at a specific place, the wireless communication terminal needs to find a communication network that can be accessed at that place. At this time, when the wireless communication terminal supports a plurality of communication standards, there is a need for a method in which the wireless communication terminal can quickly and accurately find a communication network without generating waste of power consumption due to unnecessary signal processing.

According to one or more exemplary embodiments, a communication network setting method performed by a wireless communication terminal includes reading a feature of a wireless communication signal related to at least one of a service provider or a communication standard from a database of the wireless communication terminal; Detecting the feature in a wireless communication signal received at a current location of the wireless communication terminal; When a feature is detected in the wireless communication signal, selecting a communication modem corresponding to the detected feature; And establishing a communication network using the selected communication modem.

The reading of the feature of the wireless communication signal in the communication network setting method includes a preamble, a pilot, or a cyclic prefix included in the wireless communication signal in correspondence with a communication standard or a carrier. The features of the wireless communication signal can be read.

The detecting of the feature in the wireless communication signal received at the current location of the wireless communication terminal in the communication network setting method includes detecting a feature representing a common feature known in advance in the wireless communication signal based on the communication standard or the communication provider. can do.

The detecting of the feature in the wireless communication signal received at the current location of the wireless communication terminal in the communication network setting method may include cross-correlation for detecting a known sequence and auto-correlation or frequency for detecting repetitive information. At least one operation of frequency transform for detecting a feature in the domain may be performed.

The detecting of the feature in the wireless communication signal received by the wireless communication terminal in the communication network setting method may include features corresponding to a communication standard or a communication provider read from the database in the wireless communication signal received by the wireless communication terminal. Until any one of the features is detected, the channel constituting the frequency band may be changed or the frequency band may be changed to detect the feature in the wireless communication signal.

The detecting of the feature in the wireless communication signal received by the wireless communication terminal in the communication network setting method may be any one corresponding to a communication standard or a communication provider read from the database in the wireless communication signal received by the wireless communication terminal. If a feature of is not detected, the device changes the channel or the frequency band constituting the frequency band to detect a feature in the wireless communication signal until either feature corresponding to the communication standard or service provider is detected, and all If the feature is not detected in the frequency band, the feature corresponding to the new communication standard or carrier may be detected.

The selecting of the communication modem corresponding to the detected feature in the communication network setting method may include selecting a communication modem corresponding to a communication standard or a carrier related to the feature from among a plurality of communication modems implemented in hardware; The communication modem may be implemented by changing the program in software to correspond to a communication standard or a carrier related to the feature.

A wireless communication terminal performing a communication network setting method according to an embodiment reads a feature of a wireless communication signal related to at least one of a service provider or a communication standard from a database of the wireless communication terminal, and at a current location of the wireless communication terminal. A feature detector for detecting the feature in the received wireless communication signal; A modem selection unit for selecting a communication modem corresponding to the detected feature when a feature is detected in the wireless communication signal; And a communication network setting unit for setting a communication network using the selected communication modem.

In the wireless communication terminal, the feature detector may read a feature of a wireless communication signal including a preamble, a pilot, or a cyclic prefix included in the wireless communication signal in response to a communication standard or a carrier. have.

The feature detector in the wireless communication terminal may detect a feature representing a common feature known in advance in the wireless communication signal based on the communication standard or the carrier.

In the wireless communication terminal, the feature detector may perform at least one of cross correlation for detecting a known sequence, autocorrelation for detecting repetitive information, or frequency conversion for detecting a feature in a frequency domain. .

In the wireless communication terminal, the feature detector is configured to configure a frequency band until any one of the features corresponding to the communication standard or communication operator read from the database is detected in the wireless communication signal received by the wireless communication terminal. By changing the channel or changing the frequency band, the feature can be detected in the wireless communication signal.

In the wireless communication terminal, if the feature detection unit detects one of the features corresponding to the communication standard or service provider read from the database in the wireless communication signal received by the wireless communication terminal, whichever corresponds to the communication standard or service provider Until one feature is detected, change the channels that make up the frequency band or change the frequency band to detect the feature in the wireless communication signal, and if the feature is not detected in all frequency bands, contact a new communication standard or service provider. The corresponding feature can be detected.

In the wireless communication terminal, the modem selection unit may select a communication modem corresponding to a communication standard or a carrier related to the feature from among a plurality of hardware-implemented communication modems or to correspond to the communication standard or the carrier associated with the feature. In general, the program can be changed to implement a communication modem.

1 is a diagram illustrating a communication network setting process of a wireless communication terminal according to one embodiment.

2 is a diagram illustrating a configuration of a wireless communication terminal according to one embodiment.

3 is a diagram illustrating a communication network setting method of a wireless communication terminal according to one embodiment.

4 is a diagram illustrating a process of detecting a feature of a wireless communication signal for each channel of a frequency band according to an embodiment.

5 illustrates a feature of a wireless communication signal in accordance with one embodiment.

6 illustrates a process of detecting a feature of a wireless communication signal according to an embodiment.

7 illustrates a process of selecting a modem related to a communication network according to an embodiment.

Hereinafter, an embodiment will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, the wireless communication terminal 100 may be connected to a plurality of wireless communication networks such as WiFi, WiBro, Bluetooth, 2G network, 3G communication network, and 4G communication network. To this end, the wireless communication terminal 100 may include a plurality of modems in hardware to connect with a plurality of wireless communication networks. Alternatively, the wireless communication terminal 100 may software-configure modem functions associated with a plurality of wireless communication networks in one modem so that one modem can be connected to the plurality of wireless communication networks.

The wireless communication terminal 100 is an electronic device such as a cellular phone, a smart phone, a tablet PC, a communication device of a vehicle such as an aircraft, a car, a ship, a military communication device, a voice communication radio such as a walky-talky. And the like.

When the position of the wireless communication terminal 100 is changed by the movement of the user, the wireless communication environment of the wireless communication terminal 100 is changed. Thus, the wireless communication terminal 100 needs to try to connect to a network different from the currently connected communication network or to perform a handover to another network.

To this end, the wireless communication terminal 100 may find a communication network 101 to 104 accessible at the current location. In one example, the wireless communication terminal 100 can find a communication network accessible at the current location by storing a feature of the wireless communication signal of the accessible communication network in a database and detecting the feature of the wireless communication signal. Then, the wireless communication terminal 100 may access the communication network by selecting a modem in hardware or by changing the modem setting in software.

As a result, the wireless communication terminal 100 may access a communication network capable of transmitting and receiving the wireless communication signal by detecting a feature f ₁ to f _N stored in a database in the wireless communication signal received at the current location. At this time, the wireless communication terminal 100 reads any one of the features of the wireless communication signal stored in the database, and through the signal processing whether the feature read from the wireless communication signal corresponding to the channel of a specific frequency band can be detected You can judge.

Here, the features of the wireless communication signal may be divided into communication standards and communication providers. For example, different communication standards can have different features. On the other hand, even if the communication standards are the same, if the carriers are different, the features may be different.

Referring to FIG. 2, the wireless communication terminal 200 may include a front end 201, a communication modem 202, a feature detector 203, a database 204, a modem selector 205, and a communication network setting unit ( 206).

The front end unit 201 may receive a wireless communication signal from the outside of the wireless communication terminal 200. The front end 201 may receive a wireless communication signal and convert it to digital. Then, the front end 201 may transmit the digitally converted wireless communication signal to the communication modem 202. On the contrary, the front end unit 201 may convert the wireless communication signal transmitted from the communication modem 202 into analog and wirelessly transmit it through the antenna. Here, the communication modem 202 may be a hardware modem or a software modem for corresponding to a plurality of communication standards.

The front end unit 201 may include one or more of the same or similar functions in order to apply a range of frequency bands of wireless communication signals to be transmitted and received, the number of communication networks that can be simultaneously connected, or the MIMO (Multi-Input Multi-Output) scheme. It may consist of blocks. These blocks may each include an antenna.

In one example, the front end 201 may change the frequency of the wireless communication signal to be transmitted or received through the antenna by frequency modulation or demodulation according to a communication standard or implementation. The front end 201 may be connected to a communication modem 202 that processes digital signals through analog-to-digital (ADC) and digital-to-analog (DAC).

The communication modem 202 applies the mathematical operation for generating the wireless communication signal to be transmitted and the inverse operation and mathematical correction of the mathematical operation on the digitally converted received wireless communication signal to receive the data transmitted through the wireless communication signal. Can be restored The communication modem 202 may be configured with a processor, a hardware accelerator, and the like designed to perform mathematical operations at high speed.

As described above, the communication modem 202 is composed of individual hardware modems corresponding to a plurality of communication standards, or a single software modem that can change an internal process through programming to correspond to a plurality of communication standards. Can be configured.

In addition, the communication modem 202 may perform a multi-h operation to generate a wireless communication signal to be transmitted, interpret the received wireless communication signal, and restore data. Specifically, the communication modem 202 encrypts / decrypts, modulates / demodulates, error corrections, time-frequency domain conversion, scrambling / descrambling, interleaving / deinterleaving on wireless communication signals. You can perform many operations, including deinterleaving.

To this end, the communication modem 202 may be combined into hardware components such as a hardware accelerator, a processor, a data memory, a program memory, and a memory for storing setting values. The number of hardware components may be configured differently according to the communication standards to be implemented in the wireless communication terminal 200, the number of communication standards that can be operated simultaneously, and the computational complexity of algorithms used for each communication standard.

The feature detector 203 may detect a feature extracted from the database 204 in the received wireless communication signal using a plurality of feature detection techniques. For example, the feature detector 203 may detect a feature of a wireless communication signal that matches a communication standard applied to the wireless communication terminal 200. When the feature is detected, the wireless communication terminal 200 may search for and connect to a communication network corresponding to a communication standard corresponding to the feature. As the feature detector 203 is applied, the wireless communication terminal 200 may search for a communication network that can be accessed at a current location with high speed and low power.

In one example, the feature detector 203 may perform one or more operations that can detect a feature of a packet (symbol) used for various wireless communication in the wireless communication signal. In detail, the feature detector 203 may perform operations such as cross-correlation and auto-correleation. In addition, the feature detector 203 may perform a Fourier transform that transforms the wireless communication signal received in the time domain into the frequency domain to detect a feature of the wireless communication signal in the frequency domain.

Here, cross correlation may be used to detect predetermined information such as a preamble included in a wireless communication signal. And, if it is repeatedly arranged in a wireless communication signal, such as a cyclic prefix of OFDM (Orthogonal Frequency Division Multiplexing), or a preamble having a repetitive pattern, autocorrelation may be used when the repetition interval is already known. In addition, the feature detector 203 may set various coefficients or timings differently to detect features of various wireless communication signals.

In addition, the feature detector 203 may use a mathematical operation performed by the communication modem 202 to detect a feature of the wireless communication signal. In this case, when the communication modem 202 performs all or part of the mathematical operations to be performed by the feature detector 203, the modem selector 205 may perform operations corresponding to the mathematical operations required by the communication modem 202. By activating only, it is possible to optimize the wireless communication terminal 200 in hardware and to minimize power consumption.

In one example, the feature detector 203 may read the features of a wireless communication signal corresponding to a communication standard or service provider that the wireless communication terminal 200 can process from the database 204 at a time. Then, the feature detector 203 may detect any one of the features read from the database 204 in the wireless communication signal received through the front end 201.

If the wireless communication signal received through the current channel of the frequency band cannot detect all the features related to the communication standard or the carrier, the feature detector 203 reads the feature read from the wireless communication signal received through the other channel. One of these features can be detected. As such, the feature detector 203 may repeatedly detect the feature while changing the channel in the same frequency band until the feature is detected. If all the channels of the same frequency band cannot detect all the features related to the communication standard or the carrier, the feature detector 203 may detect the features in the corresponding wireless communication signal by changing the channel in the other frequency band. have.

As another example, the feature detector 203 may read from the database 204 a feature of a wireless communication signal corresponding to any communication standard or carrier that the wireless communication terminal 200 can process. Then, the feature detector 203 may detect a feature read from the database 204 in the wireless communication signal received through the front end 201.

If the wireless communication signal received through the current channel of the frequency band cannot detect a feature related to a communication standard or a communication provider, the feature detector 203 may not be able to detect the communication standard from the wireless communication signal received through another channel. Related features can be detected. As such, the feature detector 203 may repeatedly detect the feature while changing the channel in the same frequency band until the feature is detected. If the feature is not detected in all channels of the same frequency band, the feature detector 203 may detect the feature in a wireless communication signal of another frequency band.

If the feature is not detected in all frequency bands that the wireless communication terminal can receive, the feature detector 203 reads the feature of the communication signal corresponding to the new communication standard or service provider from the database and receives the received feature from the wireless communication signal. The corresponding feature can be detected. At this time, the process of detecting the feature starts again in the frequency band where the feature was initially detected.

The database 204 may store features of wireless communication signals associated with all communication networks configurable in the wireless communication terminal 200. For example, the feature may mean a variety of information for identifying a wireless communication signal, such as the form of a preamble included in the wireless communication signal, the form of a pilot signal, an allocation position of a start frequency, and the like.

In addition to the features, the database 204 may store a type of a communication network, a center frequency, a channel width, and the like. As the communication standard to which the wireless communication terminal 200 can access increases or functions are improved, data stored in the database 204 may be added or updated.

When the feature detector 203 detects a feature of the wireless communication signal, the modem selector 205 may select a modem for connecting to a communication network matching a communication standard corresponding to the detected feature. As described above, the communication modem 202 may be divided into a hardware modem corresponding to each of the plurality of communication standards or a software modem that can be changed programmatically to apply the plurality of communication standards in one modem.

At this time, while the feature is detected and the wireless communication terminal 200 is searching for a currently accessible communication network, the modem selector 205 may turn off the power of the communication modem 202 which is unnecessary for operation or disable the clock. The power consumption of the communication terminal 200 can be minimized.

The communication network setting unit 206 may set a communication network to which the wireless communication terminal 200 can connect at the current place through the selected communication modem. The set communication network may refer to a communication network capable of transmitting and receiving a wireless communication signal including a feature detected by the feature detector 203.

The wireless communication terminal may attempt to connect to a new communication network when the communication with the currently connected communication network cannot be performed due to the movement of the user or the change of the wireless communication environment. In this case, in order for the wireless communication terminal to access the new communication network, it is necessary to set a modem included in the wireless communication terminal according to the new communication network. Setting up a modem here involves generating outgoing signals to meet the communications standards associated with the communications network, software programming to perform operations that interpret the received signals, adjusting various parameter values, or selecting a hardware modem. Means that.

Before such setting, it is necessary to determine which communication network the wireless communication terminal can connect to at the current location. 3 illustrates a process in which a wireless communication terminal recognizes a currently accessible communication network by using a feature of a wireless communication signal.

In step 301, the wireless communication terminal can read the feature of the wireless communication signal from the database. In one example, the feature of the wireless communication signal can be determined differently based on at least one of a communication standard or a carrier. And the feature may include information for identifying a wireless communication signal associated with a communication standard that the wireless communication terminal can receive.

In one example, the wireless communication terminal can read a plurality of features at once based on all the communication standards or carriers stored in the database. In another example, a feature based on any one communication standard or carrier stored in a database can be read.

In step 302, the wireless communication terminal can detect the feature in the wireless communication signal received from the outside. If, at step 301, a plurality of features based on all communication standards or carriers stored in the database are read at once, the wireless communication terminal may detect features read in one channel included in the frequency band. If it fails to detect the feature in the channel, the wireless communication terminal may repeat the detection by changing the channel. In addition, when detecting a feature in all channels of a specific frequency band, the wireless communication terminal may repeat the process of detecting the feature by changing the frequency band.

Or, in step 301, when reading a feature based on any one communication standard or carrier stored in a database, the wireless communication terminal changes the channel included in the frequency band or the wireless communication signal received while changing the frequency band Feature can be detected at. At this time, if the feature is not detected in all frequency bands and channels, the wireless communication terminal may repeat the process of detecting again as a feature based on a new communication standard or a carrier. In other words, the wireless communication terminal can read one feature and detect features read in multiple channels and frequency bands. When the wireless communication terminal fails to detect the feature, the process of detecting the feature may be repeated by reading another feature from the database.

In step 303, the wireless communication terminal can determine whether the feature is detected. If the feature is not detected, in step 304, the wireless communication terminal can determine whether the current channel receiving the wireless communication signal is the last channel in the frequency band.

At this time, if it is not the last channel, in step 305, the wireless communication terminal may change the current channel to another channel in the frequency band. On the other hand, in the case of the last channel, in step 306, the wireless communication terminal may change the current frequency band to another frequency band. Then, in step 301 the wireless communication terminal can read the feature of the wireless communication signal from the database.

And, if the feature is detected in step 303, in step 307 the wireless communication terminal may select a modem associated with the communication standard corresponding to the detected feature. Thereafter, in step 308, the wireless communication terminal can establish a communication network using a modem.

The wireless communication terminal may read features f ₁ , f ₂ , f ₃ , and f _N of a wireless communication signal corresponding to at least one of a communication standard or a service provider associated with the wireless communication terminal from a database located therein. Features may be determined differently if communication standards are different. And even if the communication standards are the same, if the service providers are different, the features may be determined differently.

In addition, the wireless communication terminal may receive a wireless communication signal S from any communication network, and then detect whether a feature exists in the corresponding wireless communication signal. Here, the wireless communication signal may be received through an antenna of the wireless communication terminal, and may be filtered to a predetermined frequency band through RF processing. As illustrated in FIG. 4, the feature detection process of the wireless communication terminal may be performed for one channel among the plurality of channels CH1, CH2,..., CHN obtained by dividing a frequency band of the wireless communication signal at a constant frequency interval. have.

The wireless communication terminal can then detect features from the wireless communication signal for each channel. In the case of FIG. 4, it is assumed that the wireless communication terminal has read a plurality of features f ₁ to f _N associated with a processable communication standard and a carrier. In some cases, the wireless communication terminal may read one feature corresponding to either communication standard or carrier.

The feature contains the frequency band and channel information used by the communication standard. If the feature is not detected from the wireless communication signal in the current channel, the wireless communication terminal may detect the feature from the wireless communication signal in the next channel.

To this end, if it is unable to detect a feature related to the communication standard in the current channel of the frequency band, the wireless communication terminal may change the frequency to detect the feature related to the communication standard in another channel. This feature detection process is repeated repeatedly. If the feature is detected, the repeating process may be stopped.

If a feature is not detected in all channels of a specific frequency band, the wireless communication terminal may detect features from a wireless communication signal of another frequency band. At this time, if it is assumed that the wireless communication terminal has read one feature corresponding to any one communication standard or carrier, and the feature has not been detected in all frequency bands and channels, the wireless communication terminal is assigned to the new communication standard or carrier. The process of FIG. 4 can be repeated with any corresponding feature.

When the feature is detected and the search for the communication network that the wireless communication terminal can receive succeeds, the wireless communication terminal sets the modem according to the communication standard corresponding to the feature, and then accesses the communication network using the modem to perform wireless communication. Can be done.

Wireless communication signals have features that are known in common, regardless of the data to be transmitted, depending on the communication standard used. Thus, the wireless communication terminal can detect a feature corresponding to the communication standard in the wireless communication signal received from the outside. For example, the feature may include a preamble included in a WLAN signal satisfying a communication standard of the 802.11 series, a cyclic prefix or a pilot of an OFDM signal, and the like.

5 illustrates two types of features. The wireless communication signal 501 is an example of an OFDM signal and has a feature such as a cyclic prefix (CP) that is repeated at regular intervals. In order to cope with the interference between valid symbols, which are data to be actually transmitted, the OFDM signal may be prevented from interfering with a delay signal having a delay shorter than the guard interval length by inserting a guard interval before or after the valid symbols. In this case, the cyclic prefix may be used as the guard interval.

The wireless communication signal 502 has a feature such as a preamble in front of data to be actually transmitted. In the preamble, a plurality of sequences having a predetermined size may be repeatedly expressed. The preamble is used to synchronize transmission timing in wireless communication, and the sequence length or the repetition interval length may vary according to a communication standard.

The wireless communication terminal may receive a wireless communication signal to detect a feature to search for a communication network that can be accessed at the current location. In this case, the wireless communication terminal may be implemented programmable to detect a feature according to a communication standard.

In one example, the wireless communication terminal may perform a mathematical operation such as a cross-correlator to detect a sequence known in the time domain. In addition, the wireless communication terminal may perform a mathematical operation such as an auto-correlator to detect a preamble, a pilot or a cyclic prefix that appear repeatedly. In addition, the wireless communication terminal may perform a mathematical operation such as a fast fourier transform (FFT) for transforming a time domain wireless communication signal into the frequency domain to detect a feature appearing on the frequency domain. To detect such a feature, the wireless communication terminal may pre-read the feature corresponding to the communication standard in an internal database.

In FIG. 6, feature (f) 601 represents a preamble composed of an iterative sequence. The wireless communication terminal may read in advance from the database a feature 601 corresponding to a particular communication standard or carrier. At this time, the wireless communication terminal may read a plurality of features corresponding to all communication standards and carriers included in the database, or read any one feature corresponding to any one communication standard or carrier included in the database. . The length of the preamble, the number of sequences, and the length may vary depending on the communication standard and the carrier.

And, the wireless communication terminal can detect the feature in the wireless communication signal (s) 602. In one example, the wireless communication terminal can automatically correlate the wireless communication signal 602 with the feature 601. At this time, a correlation value 603 exceeding a preset threshold value may be periodically derived in a peak form at each time t _m1 to t _m6 corresponding to the boundary of each sequence constituting the preamble, which is the feature 601. have. Then, the wireless communication terminal may determine whether a feature is detected in the wireless communication signal in consideration of the peak value correlation 603 being derived. In this case, the repetition period and the number of sequences may vary according to the autocorrelation method, and it may be correlated so that one large peak is derived.

The wireless communication terminal may determine whether a correlation value 603 exceeding a threshold value is derived in a current channel of a specific frequency band to detect a feature in the wireless communication signal. If a correlation value 603 that exceeds a threshold in the current channel is not derived for the feature read from the database, the feature can be detected in the current channel and in another channel whose frequency has changed. If the feature is not detected in all channels of the frequency band, the wireless communication terminal may repeat the same process in another frequency band.

At this time, if the wireless communication terminal reads any one feature corresponding to any one communication standard or carrier, and the feature is not detected from the wireless communication signal in all frequency bands and channels, the wireless communication terminal is either a new communication standard or The process may be repeated by reading a feature corresponding to a carrier.

The modem selector 701 of FIG. 7 may select any one of a plurality of modems (modem 1 to modem N) in which the current communication modem is divided into hardware. In this case, the modem selecting unit 701 indicates selecting a modem according to a feature detected in a wireless communication signal. Here, since the feature corresponds to a communication standard, modems 1 to N may also be implemented differently according to the communication standard.

Meanwhile, the modem selector 702 of FIG. 7 allows the current communication modem to be changed in software to perform the same function as the plurality of modems. If a feature is detected in the wireless communication signal, the modem selector 702 may change the program of the modem to match the communication standard associated with the feature.

According to the above-mentioned embodiments, the wireless communication terminal does not search all the receivable communication networks, but reads the feature related to the communication standard or the carrier in advance in order to recognize the wireless communication network that is accessible at the current location, and then at the current location. By detecting a feature in the received wireless communication signal, a modem may be set in hardware or software according to the feature to perform wireless communication with the communication network. In this manner, it is possible to search for a wireless communication network that can be connected at the present location more quickly, and to prevent unnecessary mathematical operations, thereby reducing power consumption of the wireless communication terminal.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims

In the communication network setting method performed by the wireless communication terminal,

Reading a feature of a wireless communication signal associated with at least one of a carrier or a communication standard from a database of the wireless communication terminal;

Detecting the feature in a wireless communication signal received at a current location of the wireless communication terminal;

When a feature is detected in the wireless communication signal, selecting a communication modem corresponding to the detected feature;

Setting up a communication network using the selected communication modem

Communication network setting method comprising a.
The method of claim 1,

Reading a feature of the wireless communication signal,

A communication network setting method for reading a feature of a wireless communication signal including a preamble, a pilot, or a cyclic prefix included in the wireless communication signal corresponding to a communication standard or a carrier.
The method of claim 1,

Detecting the feature in the wireless communication signal received at the current location of the wireless communication terminal,

And a method for detecting a feature representing a common feature known in advance in a wireless communication signal based on the communication standard or carrier.
The method of claim 1,

Detecting the feature in the wireless communication signal received at the current location of the wireless communication terminal,

A method of setting up a communication network for performing at least one of cross correlation for detecting a known sequence, auto correlation for detecting repetitive information, or frequency transform for detecting a feature in a frequency domain.
The method of claim 1,

Detecting the feature in the wireless communication signal received by the wireless communication terminal,

The channel constituting the frequency band is changed or the frequency band is changed until one of the features corresponding to the communication standard or the carrier read from the database is detected in the wireless communication signal received by the wireless communication terminal. Communication network setting method for detecting features in a wireless communication signal.
The method of claim 1,

Detecting the feature in the wireless communication signal received by the wireless communication terminal,

If any one feature corresponding to a communication standard or service provider read from the database is not detected in the wireless communication signal received by the wireless communication terminal, until either feature corresponding to the communication standard or service provider is detected, Change the channel constituting the frequency band or change the frequency band to detect features in the wireless communication signal,

If a feature is not detected in all frequency bands, a method of establishing a communication network that detects a feature corresponding to a new communication standard or carrier.
The method of claim 1,

Selecting a communication modem corresponding to the detected feature,

Selecting a communication modem corresponding to a communication standard or a carrier related to the feature among a plurality of communication modems implemented in hardware; or

A method of setting up a communication network that implements a communication modem by changing a program in software to correspond to a communication standard or a carrier related to a feature.
In the wireless communication terminal performing a communication network setting method,

A feature detector for reading a feature of a wireless communication signal associated with at least one of a carrier or a communication standard from a database of the wireless communication terminal and detecting the feature in a wireless communication signal received at a current location of the wireless communication terminal;

A modem selection unit for selecting a communication modem corresponding to the detected feature when a feature is detected in the wireless communication signal; And

Communication network setting unit for setting a communication network using the selected communication modem

Wireless communication terminal comprising a.
The method of claim 8,

The feature detector,

A wireless communication terminal for reading a feature of a wireless communication signal including a preamble, a pilot, or a cyclic prefix included in the wireless communication signal corresponding to a communication standard or a carrier.
The method of claim 8,

The feature detector,

Wireless communication terminal for detecting a feature representing a common feature known in advance in a wireless communication signal based on the communication standard or carrier.
The method of claim 8,

The feature detector,

A wireless communication terminal performing at least one of cross correlation for detecting a known sequence, auto correlation for detecting repetitive information, or frequency conversion for detecting a feature in a frequency domain.
The method of claim 8,

The feature detector,

The channel constituting the frequency band is changed or the frequency band is changed until one of the features corresponding to the communication standard or the carrier read from the database is detected in the wireless communication signal received by the wireless communication terminal. Wireless communication terminal for detecting features in the wireless communication signal.
The method of claim 8,

The feature detector,

If any one feature corresponding to a communication standard or service provider read from the database is not detected in the wireless communication signal received by the wireless communication terminal, until either feature corresponding to the communication standard or service provider is detected, Change the channel constituting the frequency band or change the frequency band to detect features in the wireless communication signal,

If the feature is not detected in all frequency bands, the wireless communication terminal for detecting a feature corresponding to a new communication standard or carrier.
The method of claim 8,

The modem selection unit,

Selecting a communication modem corresponding to a communication standard or a carrier related to the feature among a plurality of communication modems implemented in hardware; or

A wireless communication terminal for implementing a communication modem by changing a program in software to correspond to a communication standard or a service provider associated with a feature.