JP6455502B2 - Communication terminal device and program - Google Patents

Description

  The present invention relates to a communication terminal device and a program for performing wireless communication.

  2. Description of the Related Art Conventionally, a wireless LAN system having a communication terminal device such as a handy terminal having a wireless LAN (Local Area Network) communication function and an access point as a relay station is known. This communication terminal device can connect to a device on a communication network connected to the access point by performing wireless communication with the access point.

  The wireless LAN communication method has a plurality of channels. For example, in IEEE (The Institute of Electrical and Electronics Engineers, Inc.) 802.11g, 13 channels having a channel width of 22 MHz and channel numbers of 1 to 13 are prepared in the 2.4 to 2.5 GHz band. When newly installing an access point as a wireless LAN station, the installer does not interfere with the channel of the access point to be installed with other radio waves such as channels used by other wireless LAN systems within the communication range. It is preferable to set the channel.

  As a communication terminal device having a wireless LAN communication function, one having a channel search function is known. For example, consider a case where a channel search is performed in the state of radio waves having the received electric field strength of each channel as shown in FIG.

  FIG. 10 is a diagram illustrating received electric field strength with respect to frequency when another wireless LAN station is present. In FIG. 10, the horizontal axis represents a channel corresponding to the reception frequency, and the vertical axis represents the received electric field strength. The higher the channel number, the higher the reception frequency. A graph of the received electric field strength of the channel being used in the wireless LAN communication is indicated by hatching. These are the same in other received electric field intensity diagrams.

  A radio LAN communication radio wave transmitted from the access point includes a beacon signal indicating a channel number used. In the channel search, the communication terminal device detects the electric field strength of the received radio wave by changing the reception frequency and analyzes the beacon signal of the received radio wave.

  In the case of the received electric field strength distribution of FIG. 10, it is obtained by channel search that channels 2 and 12 are in use from the beacon signal, and used channels 2 and 12 are displayed on the display unit of the communication terminal device. Since the received radio wave has a communication bandwidth, the electric field strength is generated in the channel adjacent to the used channel, but is not notified to the user.

  There is also known a line failure determination device that determines each communication failure of a plurality of lines, displays the presence / absence of a communication failure of each line, and notifies the user (for example, see Patent Document 1).

JP-A-5-56042

  However, in the conventional line failure determination apparatus, the user can know the presence or absence of a line failure, but cannot know the cause of the line failure.

  Even in the conventional communication terminal device, when a communication failure occurs due to radio waves other than wireless LAN communication, the user cannot know the cause of the communication failure. For this reason, the user may not be able to take measures to avoid a communication failure.

An object of the present invention is to be able to notify the factors of the communication failure that may occur in wireless communication.

The invention according to claim 1 is a communication terminal device having a wireless communication function, and in a wireless environment at a position where the communication terminal device exists , any one of a plurality of channels having different communication frequencies. discriminating means for discriminating whether or not it is possible to wireless communication using the channel, if it is determined that it is possible to radio communication using the predetermined channel by said discrimination means, a communication failure during the radio communication If a factor that may be generated is detected, notification information indicating that wireless communication in the wireless environment is possible and the cause of the communication failure that may occur is notified, while a communication failure occurs during the wireless communication. If a factor that may cause a problem is not detected, wireless communication in the wireless environment is possible, and other than the predetermined channel. And notifying means for notifying demonstrates notification information usage other channels, characterized by comprising a.

According to the present invention can notify the cause of the communication failure that may occur in wireless communication.

It is an external view of the communication terminal device of an embodiment of the invention. It is a block diagram which shows the function structure of a communication terminal device. It is a figure which shows the structure of a wireless LAN communication part. It is a flowchart which shows a wireless information display process. It is a figure which shows the received electric field strength with respect to the frequency in case a channel is occupied by the other wireless LAN station. It is a figure which shows the received electric field strength with respect to the frequency in case another radio station exists. It is a figure which shows the received electric field strength with respect to the frequency in case the microwave oven in use exists. (A) is a figure which shows the communication terminal device which displays a display screen when there exists another wireless LAN station and there exists an empty channel. (B) is a figure which shows the communication terminal device which displays a display screen when there exists another wireless LAN station and there exists a possibility of communication failure. (C) is a figure which shows the communication terminal device which displays a display screen when another wireless LAN station exists and all the channels are occupied. (A) is a figure which shows the communication terminal device which displays the display screen when another radio station exists. (B) is a figure which shows the communication terminal device which displays a display screen when there exists another microwave oven in use. It is a figure which shows the received electric field strength with respect to the frequency when another wireless LAN station exists.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. The present invention is not limited to the illustrated example.

  First, the device configuration of the present embodiment will be described with reference to FIGS. FIG. 1 is an external view of a communication terminal device 10 according to the present embodiment. FIG. 2 is a block diagram illustrating a functional configuration of the communication terminal device 10. FIG. 3 is a diagram illustrating a configuration of the wireless LAN communication unit 16.

  The communication terminal device 10 has a wireless LAN communication function and is a handy terminal for managing products such as stores and warehouses. However, the communication terminal device 10 is not limited to the handy terminal, and may be a smartphone, a tablet PC (Personal Computer), a notebook PC, a PDA (Personal Digital Assistant), a mobile phone as long as it has a wireless LAN communication function. Alternatively, a communication terminal device such as a communication dedicated terminal may be used.

  The communication terminal device 10 can communicate with devices such as a server device on a communication network connected to the access point via an access point installed in a store, a warehouse, or the like.

  As illustrated in FIG. 1, the communication terminal device 10 includes a housing unit 2, an operation key group 12 </ b> A, and a display unit 14 as a notification unit. The casing unit 2 is a casing of the communication terminal apparatus 10 and stores components such as various boards therein. The operation key group 12A is an operation key group that includes a trigger key for reading a symbol of a bar code and a two-dimensional code, a character input key, various function keys, and the like, and accepts a user operation input. The display unit 14 includes a display panel such as an LCD (Liquid Crystal Display) or an EL (ElectroLuminescent) display, and displays various display information on the display panel.

  Next, the internal functional configuration of the communication terminal apparatus 10 will be described with reference to FIG. As shown in FIG. 2, the communication terminal device 10 includes a CPU (Central Processing Unit) 11 as an analysis means, an operation unit 12, a RAM (Random Access Memory) 13, a display unit 14, and a ROM (Read Only Memory). ) 15, a wireless LAN communication unit 16, a storage unit 17, a scanner unit 18, and a power supply unit 19. Each part except the power supply part 19 of the communication terminal device 10 is mutually connected via the bus | bath 19A.

  The CPU 11 controls each unit of the communication terminal device 10. The CPU 11 reads a designated program out of various programs from the ROM 15 and expands it in the RAM 13 and executes various processes in cooperation with the expanded program.

  The CPU 11 switches the channel of the wireless LAN communication unit 16 according to the wireless information display program 151, and communication failure due to radio waves other than wireless LAN communication according to the electric field strength corresponding to each switched channel and the detection result of the communication protocol. And the analysis result information is displayed on the display unit 14.

  The operation unit 12 includes an operation key group 12A, receives a pressing input to each key of the operation key group 12A from the user, and outputs operation information corresponding to the pressing input to the CPU 11. Moreover, the operation part 12 is good also as a structure which receives the touch input from a user including the touchscreen provided on the screen of the display part 14. FIG.

  The RAM 13 is a volatile semiconductor memory and has a work area for storing various data and various programs.

  The display unit 14 performs various displays on the display panel according to display information input from the CPU 11.

  The ROM 15 is a read-only semiconductor memory that stores various data and various programs. The ROM 15 stores a wireless information display program 151.

  The wireless LAN communication unit 16 is a wireless communication unit that performs wireless LAN communication. The wireless LAN communication unit 16 performs wireless communication with the access point. The wireless LAN communication unit 16 has a function of detecting the electric field strength of the received radio wave and a function of modulating / demodulating the radio wave. The communication system of the wireless LAN communication unit 16 is assumed to be IEEE 802.11g.

  The storage unit 17 is a non-volatile memory such as a flash memory that stores information in a readable and writable manner, an EEPROM (Electrically Erasable Programmable ROM), or a RAM backed up by a battery.

  The scanner unit 18 is a scanner unit such as a laser scanner that reads a barcode as a symbol or an imager that reads a barcode and a two-dimensional code as a symbol, and outputs the read data to the CPU 11.

  The power supply unit 19 is a power supply unit such as a secondary battery or a primary battery that supplies power to each unit in the communication terminal device 10.

  The communication terminal device 10 includes an RFID (Radio Frequency IDentification) tag reader / writer unit, a printing unit, a wireless communication unit that performs wireless communication (for example, mobile phone communication) other than wireless LAN communication, and a USB (Universal Serial Bus). ) Or the like.

  Next, the internal configuration of the wireless LAN communication unit 16 will be described with reference to FIG. As shown in FIG. 3, the wireless LAN communication unit 16 includes antennas 161 and 162, an antenna switch 163, a transmission / reception unit 164, a switching unit, a baseband calculation unit 166 as a field strength detection unit, and a communication protocol detection unit. As a MAC (Medium Access Controller) unit 167. The antennas 161 and 162, the antenna switch 163, and the transmission / reception unit 164 function as communication means.

  Antennas 161 and 162 for transmitting and receiving radio waves are two antennas for diversity. The antenna switch 163 switches between the transmission / reception system of the transmission / reception unit 164 and the antenna system to the stronger transmission / reception radio wave of the antennas 161 and 162.

  The transmission / reception unit 164 includes an amplifier 1641, a BPF (Band Pass Filter) 1642, a mixer 1643, an amplifier 1644, a mixer 1645, an A-D conversion unit 1646 as a reception system, and a DA conversion unit 1647 as a transmission system. A mixer 1648, an amplifier 1649, a mixer 1650, a BPF 1651, an amplifier 1652, an amplifier 1652, a local oscillator 1653, and a PLL (Phase Lock Loop) synthesizer 1654 are included.

  The local oscillator 1653 generates an electric signal having a predetermined frequency. The PLL synthesizer 1654 changes the frequency of the electric signal output from the local oscillator 1653 to a frequency corresponding to the channel to be transmitted or received in accordance with the channel switching control of the baseband calculation unit 166, and outputs it.

  In the receiving system, the electric signal received and output by the antenna 161 or 162 is amplified by the amplifier 1641 through the antenna switch 163, transmitted only in a predetermined band by the BPF 1642, and in accordance with the output signal of the PLL synthesizer 1654. Thus, the frequency is finely adjusted by the mixer 1643. The signal output from the mixer 1643 is amplified by the amplifier 1644, the frequency is greatly adjusted by the mixer 1645 in accordance with the output signal of the PLL synthesizer 1654, and is converted into a digital signal by the AD converter 1646. Thus, the electrical signal output from the antenna switch 163 is down-converted by the transmission / reception unit 164 according to the set channel.

  The baseband calculation unit 166 performs signal processing on the digital signal output from the AD conversion unit 1646. Further, the baseband calculation unit 166 controls the channel switching of the transmission / reception unit 164 (PLL synthesizer 1654), detects the electric field strength of the received radio wave from the received signal (digital signal output from the AD conversion unit 1646), I do.

  The MAC unit 167 performs MAC control that defines a frame transmission / reception method, a frame format, an error detection method, and the like on the signal output from the baseband calculation unit 166 or the signal input from the CPU 11. The MAC unit 167 demodulates the signal output from the baseband calculation unit 166 according to the communication protocol of wireless LAN communication, and outputs the demodulated signal to the CPU 11 via the bus 19A as an interface. The MAC unit 167 analyzes a beacon signal or a probe response in the demodulated signal.

  In the transmission system, the data to be transmitted output from the CPU 11 is modulated into a baseband signal by the baseband calculation unit 166 via the MAC unit 167, converted into an analog signal by the DA conversion unit 1647, and output from the PLL synthesizer 1654. The frequency is greatly adjusted by the mixer 1648 according to the output signal. The signal output from the mixer 1648 is amplified by the amplifier 1649, and the frequency is finely adjusted by the mixer 1650 in accordance with the output signal of the PLL synthesizer 1654.

  The signal output from the mixer 1650 is transmitted only in a predetermined band by the BPF 1651, amplified by the amplifier 1652, input to the antenna 161 or 162 via the antenna switch 163, and transmitted as a radio wave. In this manner, the electrical signal output from the baseband calculation unit 166 is up-converted by the transmission / reception unit 164 according to the set channel.

  Next, the operation of the communication terminal device 10 will be described with reference to FIGS. FIG. 4 is a flowchart showing the wireless information display process. FIG. 5 is a diagram showing the received electric field strength with respect to the frequency when the channel is occupied by another wireless LAN station. FIG. 6 is a diagram showing the received electric field strength with respect to the frequency when there are other wireless stations. FIG. 7 is a diagram illustrating received electric field strength with respect to frequency when there is a microwave oven in use. FIG. 8A is a diagram showing the communication terminal device 10 that displays the display screen 141A when there is another wireless LAN station and there is an empty channel. FIG. 8B is a diagram showing the communication terminal device 10 that displays the display screen 141B when there is a possibility of communication failure due to other wireless LAN stations. FIG. 8C is a diagram showing the communication terminal apparatus 10 that displays the display screen 141C when there are other wireless LAN stations and all channels are occupied. FIG. 9A is a diagram illustrating the communication terminal device 10 that displays the display screen 141D when there are other wireless stations. FIG. 9B is a diagram illustrating the communication terminal device 10 that displays the display screen 141E when there is another microwave oven in use.

  A wireless information display process executed by the communication terminal device 10 will be described. Wireless information display processing, for example, when installing a new access point, detects the electric field strength of radio waves for other wireless LAN communications, etc., and analyzes information such as the cause of communication failure according to the detection result Is displayed.

  In the communication terminal device 10, for example, triggered by the input of a wireless information display processing execution instruction from the user via the operation unit 12, the CPU 11 reads the wireless information display read from the ROM 15 and appropriately expanded in the RAM 13. The wireless information display process is executed in cooperation with the program 151.

  As shown in FIG. 4, first, the CPU 11 performs a channel search for switching the reception channel, detecting the received electric field strength in each channel, and detecting the beacon signal in each channel by the wireless LAN communication unit 16. The search result is stored in the storage unit 17 (step S11). The search result storage destination may be the RAM 13.

  In step S <b> 11, channel switching is performed for all channels 1 to 13 under the control of the baseband calculation unit 166, and the received field strength of each switched channel is detected. Also, the received signal of each switched channel is demodulated (correlation decoding with a despread random code) by the MAC unit 167, the presence or absence of the beacon signal of the demodulated signal according to the success or failure of the demodulation, the content of the beacon signal, , Is detected. The content of the beacon signal includes information on the channel number of the channel designated by the beacon signal. As a search result, the electric field strength, the presence / absence of a beacon signal, and the channel number specified by the beacon signal are stored in association with the channel number at the time of channel switching. In step S11, the CPU 11 transmits a probe request to the wireless LAN station via the wireless LAN communication unit 16, receives the returned probe response, and acquires the channel number specified by the probe response. Also good.

  Then, the CPU 11 determines whether or not there is a channel capable of receiving the electric field strength among all the channels according to the search result information stored in the storage unit 17 (step S12). In step S12, it is determined whether or not the received electric field strength of each channel is equal to or higher than a predetermined threshold value. If the received electric field strength is equal to or higher than the threshold value, it is determined that the electric field strength can be received by the channel. It is determined that the electric field strength cannot be received on the channel.

  When there is no channel capable of receiving the electric field strength (step S12; NO), the CPU 11 analyzes that there is no other wireless LAN station and there is no other radio wave other than the wireless LAN communication, and the wireless LAN communication can be used. Display information including a message to that effect is generated (step S13). And CPU11 displays the display information produced | generated by step S13, S17, S19, S20, S22 or S23 on the display part 14 (step S14), and a radio | wireless information display process is complete | finished.

  In the case of passing through step S13, all channels are in a communication state in which they are vacant channels with no risk of communication failure. In this case, in step S14, for example, a display screen including a message “Wireless LAN communication is available (no other radio waves) is available” is displayed. This display screen may include information that all channels are empty channels.

  When there is a channel that can receive the electric field strength (step S12; YES), the CPU 11 receives the received signal depending on the presence / absence of the beacon signal of each channel (demodulation success / failure) according to the search result information stored in the storage unit 17. Whether or not a communication protocol for wireless LAN communication has been detected is determined (step S15).

  When the communication protocol is detected (step S15; YES), the CPU 11 acquires the channel number specified by the beacon signal in accordance with the search result information stored in the storage unit 17, and corresponds to the acquired channel number. It is determined whether or not the used channel interval is 5 channels or more (step S16). The reason why the number of channels is set to 5 or more in step S16 is that one used channel occupies a band with a width of 3 channels, and thus a free band with a width of at least 5 channels is required to secure an empty channel. It is.

  If the interval of the used channels is 5 channels or more (step S16; YES), the CPU 11 analyzes that there is another wireless LAN station but there is an empty channel and wireless LAN communication is available, and that is the effect. Display information including the message is generated (step S17).

  In the case of passing through step S17, a communication state is established in which a channel having an interval of 5 channels or more from the used channel is an empty channel. For example, as shown in FIG. 10, channels 2 and 12 that can receive the electric field strength and are designated by the beacon signal are used channels, and there are five or more channels. In step S14, for example, a display screen 141A shown in FIG. 8A is displayed.

  The empty channel in the reception state of FIG. The display information on the display screen corresponding to step S17 may include the channel number of at least one of the used channel and the empty channel.

  When the interval of the used channels is less than 5 channels (step S16; NO), the CPU 11 cannot receive the electric field strength according to the search result information stored in the storage unit 17 (the electric field strength is less than a predetermined threshold value). It is determined whether or not there are 5 or more channels continuously (step S18).

  When there are five or more consecutive channels that cannot receive the electric field strength (step S18; YES), the CPU 11 has another wireless LAN station, the wireless LAN station approaches the communication terminal apparatus 10, and the electric field strength of the radio wave is high. Thus, there is a possibility of communication failure due to channel congestion, but analysis is made that wireless LAN communication is available, and display information including a message to that effect is generated (step S19).

  In the case of passing through step S19, a communication state in which a channel that can take an interval of 5 consecutive channels or more and cannot receive the electric field strength becomes a usable channel. For example, channels 1 and 11 that can receive the electric field strength are channels 1 and 11 that are designated by the beacon signal, and there are channels 2 to 10 that are five or more continuous channels that cannot receive the electric field strength, and channel 6 that is designated by the beacon signal. This is the case. In this case, channel 6 can be used as a usable channel.

  This is because, in wireless LAN communication, when radio waves having the same frequency are received from different wireless LAN stations, radio waves with high electric field strength are given priority. However, when another wireless LAN station approaches the communication terminal device 10 and the electric field strength increases, there is a possibility that a communication failure may occur due to radio waves of the other wireless LAN station. In this case, in step S14, for example, a display screen 141B shown in FIG. 8B is displayed. The display information on the display screen 141B includes at least one channel number of a use channel, a usable channel, and a channel specified by a beacon signal for which electric field intensity cannot be received (a channel that may cause communication failure). It is good also as including.

  If there are no more than five consecutive channels that cannot receive the electric field strength (step S18; NO), the CPU 11 has other wireless LAN stations, and all the channels are occupied by radio waves from the wireless LAN stations, so that wireless LAN communication is possible. Is not usable, and display information including a message to that effect is generated (step S20).

  When passing through step S20, it will be in the communication state without an empty channel. For example, as shown in FIG. 5, channels 1, 6, and 11 specified by a beacon signal that can receive electric field strength are used channels, and there are no channels of five or more continuous channels that cannot receive electric field strength. In this case, in step S14, for example, a display screen 141C shown in FIG. 8C is displayed. The display information on the display screen 141C may include the channel number of the used channel.

  When the communication protocol is not detected (step S15; NO), the CPU 11 determines whether there is a difference of a predetermined threshold value or more in the electric field strength between adjacent channels according to the search result information stored in the storage unit 17. It discriminate | determines (step S21). When there is a difference in electric field strength between adjacent channels (step S21; YES), the CPU 11 has another wireless station (for example, a Bluetooth (registered trademark) device) that is not a wireless LAN station, and wirelessly uses radio waves of the wireless station. Analyzing that there is a possibility of communication failure in LAN communication, display information including a message to that effect is generated (step S22).

  In the case of passing through step S22, a communication state in which a communication failure occurs in wireless LAN communication occurs in a channel with high electric field strength by another wireless station. For example, as shown in FIG. 6, the channel 6 can receive the electric field strength, and there is a difference in electric field strength between the channel 6 and other channels. Channel 6 is receiving radio waves from other radio stations. In this case, in step S14, for example, a display screen 141D shown in FIG. 9A is displayed. The display information on the display screen 141D may include information on the channel number of a channel with high electric field strength and the type of wireless communication that can be another wireless station (for example, Bluetooth (registered trademark)).

  If there is no difference in electric field strength between adjacent channels (step S21; NO), the CPU 11 has another microwave oven in use, and a communication failure has occurred in wireless LAN communication due to radio waves from the microwave oven. It analyzes that LAN communication is not available, and generates display information including a message to that effect (step S23). A microwave oven in use generates radio waves with a wide bandwidth having the same electric field strength in all channels.

  When passing through step S23, all channels are in a communication state having the same electric field strength by the microwave oven. For example, as shown in FIG. 7, the channels 1 to 13 have the same high electric field strength. In this case, in step S14, for example, a display screen 141E shown in FIG. 9B is displayed.

  As described above, according to the present embodiment, the CPU 11 of the communication terminal device 10 switches the channel of the transmission / reception unit 164 by the baseband calculation unit 166, detects the electric field strength of the reception signal, and wirelessly transmits the reception signal by the MAC unit 167. Demodulation is performed using a communication protocol for LAN communication, and the communication protocol is detected from the received signal in accordance with the success or failure of demodulation of the communication protocol. Then, the CPU 11 analyzes the cause of communication failure caused by radio waves other than wireless LAN communication according to the detected electric field intensity corresponding to each switched channel and the detection result of the communication protocol, and displays information on the analysis result Displayed on the unit 14.

  For this reason, it is possible to notify the user of the cause of communication failure caused by radio waves other than wireless LAN communication by display. The user can appropriately avoid communication failure caused by radio waves other than wireless LAN communication.

  Further, the CPU 11 determines whether or not there is a difference in the electric field strengths of all channels when there is a channel in which the detected electric field strength is equal to or higher than a predetermined threshold and the electric field strength can be received and no communication protocol is detected. If there is a difference between the electric field strengths, the cause of the communication failure is a wireless station other than the wireless LAN communication in step S22. For this reason, when the cause of the communication failure is a wireless station other than the wireless LAN communication, the fact can be notified to the user by display. For example, the user can appropriately avoid a communication failure by the radio station, such as stopping the operation of the radio station as a radio wave generation source or leaving the place where the channel search is performed. Alternatively, the user can perform wireless LAN communication by understanding that the communication speed may be reduced.

  Further, the CPU 11 determines whether or not there is a channel in which the detected electric field strength is equal to or greater than a predetermined threshold and the electric field strength can be received, and there is no difference between the electric field strengths of all the channels. In step S23, the cause of the communication failure is a microwave oven as a radio wave generator with a wide bandwidth. For this reason, when the cause of the communication failure is the microwave oven, the fact can be notified to the user by display. For example, the user can appropriately avoid communication troubles caused by the microwave oven, such as stopping the operation of the microwave oven as a radio wave generation source or leaving the place where the channel search is performed.

  In addition, the CPU 11 analyzes the availability of wireless LAN communication when there is a radio wave of another wireless LAN station according to the detected electric field strength corresponding to each switched channel and the detection result of the communication protocol. The information of the analysis result is displayed on the display unit 14. Therefore, it is possible to notify the user of the availability of wireless LAN communication when there is a radio wave from another wireless LAN station by display. The user can appropriately avoid communication failure according to the possibility of communication failure due to radio waves of other wireless LAN stations.

  Further, the CPU 11 specifies a beacon signal included in the signal demodulated by the MAC unit 167 when there is a channel in which the detected electric field intensity is equal to or greater than a predetermined threshold and the electric field intensity can be received and a communication protocol is detected. It is determined whether or not the interval between the selected channels is 5 or more, and if it is 5 or more, in step S17, the availability of wireless LAN communication when there is a radio wave of another wireless LAN station is determined as an empty channel. Suppose that wireless LAN communication is available. Therefore, the availability of the wireless LAN communication can be notified to the user by displaying that there is an empty channel and the wireless LAN communication is available. The user can appropriately search for an empty channel according to the availability of wireless LAN communication when there is a radio wave from another wireless LAN station.

  In addition, when the interval of the channel specified by the beacon signal included in the signal demodulated by the MAC unit 167 is 5 or more, the CPU 11 continues the channel in which the electric field intensity is less than a predetermined threshold and cannot receive the electric field intensity. In step S19, the availability of wireless LAN communication when there is a radio wave from another wireless LAN station indicates that there is a risk of communication failure due to channel congestion. It is assumed that wireless LAN communication is available. For this reason, the availability of the wireless LAN communication can be notified to the user by displaying that the wireless LAN communication can be used although there is a risk of communication failure due to channel congestion. For example, the user can appropriately avoid communication failure due to radio waves of other wireless LAN stations, such as leaving other wireless LAN stations. Alternatively, the user can perform wireless LAN communication by understanding that the communication speed may be reduced.

  Further, the CPU 11 can use the wireless LAN communication when there is a radio wave of another wireless LAN station in step S20 when there are five or more channels that cannot receive the electric field intensity because the electric field intensity is less than a predetermined threshold. It is assumed that all channels are occupied and wireless LAN communication is impossible. Therefore, the availability of this wireless LAN communication can be notified to the user by displaying that all channels are occupied and wireless LAN communication is impossible. For example, the user can appropriately avoid communication failure due to radio waves of other wireless LAN stations, such as leaving other wireless LAN stations. Further, when the communication terminal device 10 is compatible with another wireless LAN communication method such as IEEE802.11a, the wireless communication method of the communication terminal device 10 is switched to another wireless LAN communication method, so that It is possible to appropriately avoid communication failure due to radio waves from the wireless LAN station.

In the above description, the example in which the ROM 15 is used as the computer-readable medium of the program according to the present invention is disclosed, but the present invention is not limited to this example.
As other computer-readable media, a non-volatile memory (storage unit 17) such as a flash memory and a portable recording medium such as a CD-ROM can be applied.
A carrier wave is also applied to the present invention as a medium for providing program data according to the present invention via a communication line.

  The description in the above embodiment is an example of the communication terminal device and the program according to the present invention, and the present invention is not limited to this.

  In the above-described embodiment, the communication terminal device 10 is configured to perform the IEEE802.11g wireless LAN communication in the 2.4 GHz band, but is not limited thereto. The communication terminal device 10 may be configured to perform other wireless LAN communication of 2.4 GHz band such as IEEE802.11b or wireless communication of another frequency band.

  Moreover, in the said embodiment, it was set as the structure which notifies the microwave oven as a Bluetooth (registered trademark) apparatus as a radio station, or a radio wave generator with a wide bandwidth as a cause of communication failure by radio waves other than wireless LAN communication. However, the present invention is not limited to this. For example, a radio wave generator that generates radio waves with a wide bandwidth in the 2.4 GHz band may be medical equipment. A radar wave or the like may be used as a cause of communication failure due to radio waves other than wireless LAN communication other than the 2.4 GHz band.

  Moreover, in the said embodiment, although it was set as the structure which notifies a user by displaying the analysis result of the cause and possibility of a communication failure on the display part 14, it is not limited to this. For example, the communication terminal device 10 may include a voice output unit and a lighting unit such as an LED (Light Emitting Diode), and notify the user of the analysis result by voice output by the voice output unit or lighting of the lighting unit. .

  Moreover, it is needless to say that the detailed configuration and detailed operation of each component of the communication terminal device 10 in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

Although the embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and the equivalents thereof.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
A communication terminal device that performs wireless LAN communication having a plurality of channels of different frequencies,
Communication means for receiving radio waves and outputting received signals;
Switching means for switching the channel of the communication means, electric field strength detection means for detecting the electric field strength of the received signal,
A communication protocol detecting means for demodulating the received signal with the communication protocol of the wireless LAN communication and detecting the communication protocol from the received signal according to the success or failure of the demodulation of the communication protocol;
The channel of the communication unit is switched by the switching unit, and communication failure caused by radio waves other than the wireless LAN communication is determined according to the detected electric field strength corresponding to each switched channel and the detection result of the communication protocol. An analysis means for analyzing the cause;
Notification means for notifying information of the analysis result of the analysis means;
A communication terminal device comprising:
<Claim 2>
The analysis means determines whether or not there is a difference in the electric field strengths of all the channels when there is a channel with the detected electric field strength equal to or greater than a first threshold and the communication protocol is not detected. The communication terminal apparatus according to claim 1, wherein when there is a difference in the electric field strength, the cause of the communication failure is a wireless station other than the wireless LAN communication.
<Claim 3>
The analysis means determines whether or not there is a difference in the electric field strengths of all the channels when there is a channel with the detected electric field strength equal to or greater than a first threshold and the communication protocol is not detected. The communication terminal device according to claim 1 or 2, wherein the cause of the communication failure is a radio wave generator when there is no difference in the electric field strength.
<Claim 4>
The analysis unit switches the channel of the communication unit by the switching unit, and according to the detected electric field strength corresponding to each switched channel and the detection result of the communication protocol, The communication terminal device according to any one of claims 1 to 3, which analyzes the availability of wireless LAN communication when there is a radio wave.
<Claim 5>
The analysis means is configured such that when there is a channel with the detected electric field strength equal to or greater than a first threshold and the communication protocol is detected, the interval of the channel specified by the demodulated signal is set to a second threshold. If the interval between the designated channels is equal to or greater than the second threshold, the availability of the wireless LAN communication is determined based on whether there is an empty channel that does not cause a communication failure. The communication terminal device according to claim 4, wherein communication is available.
<Claim 6>
The analyzing means determines whether or not the channel having the electric field intensity less than the first threshold is continuously equal to or greater than the second threshold when the specified channel interval is not equal to or greater than the second threshold; 6. When the channel is continuously equal to or greater than a second threshold value, the availability of the wireless LAN communication is determined to be that wireless LAN communication can be used although there is a possibility of communication failure due to channel congestion. The communication terminal device according to 1.
<Claim 7>
The analyzing means determines whether the wireless LAN communication is available when all the channels having electric field strengths less than the first threshold are continuously equal to or higher than the second threshold, and all the channels are occupied. The communication terminal device according to claim 6, wherein the communication is impossible.
<Claim 8>
A communication terminal device computer for performing wireless LAN communication having a plurality of channels of different frequencies,
Communication means for receiving radio waves and outputting received signals;
Switching means for switching channels of the communication means;
Electric field strength detecting means for detecting the electric field strength of the received signal;
A communication protocol detecting means for demodulating the received signal with the communication protocol of the wireless LAN communication and detecting the communication protocol from the received signal according to success or failure of the demodulation of the communication protocol; a channel of the communication means by the switching means; Analyzing means for analyzing the cause of communication failure due to radio waves other than the wireless LAN communication, according to the detected electric field strength corresponding to each switched channel and the detection result of the communication protocol,
Notification means for notifying information of the analysis result of the analysis means;
Program to function as.

10 Communication Terminal Device 2 Housing Unit 11 CPU
12 Operation unit 13 RAM
14 Display 15 ROM
16 Wireless LAN communication unit 17 Storage unit 18 Scanner unit 19 Power supply unit 19A Bus

Claims (6)

A communication terminal device having a wireless communication function,
Determining means for determining whether wireless communication using any one of a plurality of channels having different communication frequencies is possible in a wireless environment at a position where the communication terminal device exists;
If it is determined by the determination means that wireless communication using the predetermined channel is possible, if a factor that may cause a communication failure is detected during the wireless communication, wireless communication in the wireless environment is performed. If notifying the fact that it is possible and notifying the notification information that clearly indicates the cause of the communication failure that may occur, but also the factor that may cause the communication failure during the wireless communication is not detected, the wireless in the wireless environment A notification means for notifying that the communication is possible and notifying information for clearly indicating a use status of a channel other than the predetermined channel ;
A communication terminal device comprising: The notifying means includes, as the cause of the communication failure and the usage status of the other channel , presence of radio waves related to wireless communication in the same wireless system as the communication terminal apparatus, or wireless communication in a wireless communication system different from the wireless communication terminal Notification information that clearly indicates the presence of radio waves related to communication is notified.
The communication terminal device according to claim 1. If the determination means determines that wireless communication is impossible, the notification means indicates that wireless communication in the wireless environment is impossible, and the cause of communication failure that disables the wireless communication Notify notification information that clearly states,
The communication terminal apparatus according to claim 1 or 2, wherein The notifying means may cause a communication failure that makes the wireless communication impossible, the presence of a radio wave related to the wireless communication in the same wireless system as the communication terminal device, or a radio wave from a radio wave generating device different from the wireless communication. Notify the notification information that clearly indicates the occurrence,
The communication terminal device according to claim 3. The determining means determines whether or not wireless communication is possible based on the presence or absence of communication protocol detection or the strength of radio wave intensity in the wireless environment.
The communication terminal device according to any one of claims 1 to 4, wherein A program for controlling a computer of a communication terminal device having a wireless communication function,
The computer,
A discriminating means for discriminating whether or not radio communication using any one of a plurality of channels having different communication frequencies is possible in a radio environment at a position where the communication terminal device exists;
If it is determined by the determination means that wireless communication using the predetermined channel is possible, if a factor that may cause a communication failure is detected during the wireless communication, wireless communication in the wireless environment is performed. If notifying the fact that it is possible and notifying the notification information that clearly indicates the cause of the communication failure that may occur, but also the factor that may cause the communication failure during the wireless communication is not detected, the wireless in the wireless environment A notification means for notifying that the communication is possible and notifying information for clearly indicating the usage status of the channel other than the predetermined channel;
A program designed to function as

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