JP2014192837A - Communication terminal device, device and method for travel speed determination, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a user load when a communication terminal device activates a communication unit to switch a communication method etc., with the suppression of a power consumption increase.SOLUTION: The communication terminal device includes: a first communication unit for connecting to a first communication network to perform radio communication; a second communication unit for connecting to a second communication network to perform radio communication; a channel estimation unit for performing channel estimation on the communication of the first communication unit; a travel speed index value calculation unit for calculating the index value of a travel speed on the basis of the channel estimation result by the channel estimation unit; and a travel speed determination unit for comparing the travel speed index value with a predetermined threshold, to determine whether or not the travel speed is suitable for the use of the second communication unit.

Description

  The present invention relates to a communication terminal device, a moving speed determination device, a moving speed determination method, and a program.

In wireless communication systems such as LTE (Long Term Evolution, LTE is a registered trademark) and 3G (3rd generation mobile phone), it is assumed that communication terminal devices are used during high-speed movement in trains and automobiles. Has a base station device installed outdoors. For this reason, the communication terminal device can perform stable high-speed communication when connected indoors to a wireless LAN (local area network) system typified by Wi-Fi (registered trademark) by a hot spot or the like.
As described above, when the optimum communication method differs depending on the location, it is conceivable that the communication terminal apparatus supports a plurality of communication methods and can be used by switching the communication methods.

Some techniques have been proposed in connection with switching of communication methods. For example, in Patent Document 1, a plurality of communication units having different communication methods and data signals generated when the plurality of communication units receive radio communication waves, or data transmitted by the plurality of communication units using radio communication waves are disclosed. A data processing unit that processes signals according to a communication method, a connection switching unit that connects one communication unit and a data processing unit included in a plurality of communication units, and a motion detection unit that detects a moving speed of the communication device Control for controlling a connection switching unit so as to connect a communication unit and a data processing unit which are determined based on a moving speed detected by the motion detection unit and a communication unit to be connected to the data processing unit It is described that it comprises a part.
As a result, in a communication device capable of communicating with a plurality of communication methods, the communication method can be switched according to the movement status of the communication device.

The mobile communication terminal described in Patent Document 2 includes a first communication unit that performs wireless communication with a system that provides a service locally, and a second communication that performs wireless communication between a system that provides a wide area service. Communication means, area detection means for detecting a wireless service area of a system that provides a service locally, and wireless communication when the area detection means detects a wireless service area during wireless communication using the second communication means And a control means for switching the path from the second communication means to the first communication means.
As a result, when the mobile communication terminal described in Patent Document 2 performs wireless communication with a system that provides a wide area service using the first communication means, the area detection means uses the wireless service area. When the control means detects that it has entered, the control means automatically sets the communication mode with the system that locally provides services such as wireless LAN by the first communication means from the second communication means. It is said that it can save time and effort.

In addition, the multimode portable terminal described in Patent Document 3 is a multimode portable terminal that can be connected to a plurality of wireless communication networks with different standards, and mode selection means for presetting mode selection information by user input, and a plurality of wireless A network discrimination means for determining which area within the communication network is located by the presence or absence of a control signal unique to the wireless communication network, and selecting and connecting the wireless communication networks within the area in priority order according to the mode selection information Network selection means.
As a result, in the multi-mode portable terminal described in Patent Document 3, the area for receiving low-speed high-speed data communication is widened on one terminal, and the user can select the mode according to the desired service, content, and desired quality. Troublesome settings are not required.

JP 2010-245825 A Japanese Patent Laying-Open No. 2005-079884 JP 2011-172258 A

When the user manually switches the communication method of the communication terminal device, the user needs to grasp whether or not the user is within the service area and perform a communication method switching operation, which is a burden on the user.
On the other hand, the communication device described in Patent Document 1 includes an acceleration sensor or a GPS (Global Positioning System) as a motion detection unit, and needs to detect the moving speed of the communication device. Power consumption increases. Alternatively, Patent Document 1 describes a mode in which a mobile phone acquires speed information from a mobile device (for example, a car navigation system or a speedometer) to detect movement. Only when connection is possible.

Further, in the mobile communication terminal described in Patent Document 2, it is necessary to scan a wireless LAN system that is not used for communication in order to detect a wireless service area, which increases power consumption.
Moreover, in the multimode portable terminal described in Patent Document 3, it is more preferable that power consumption for detecting a control signal unique to the wireless communication network can be reduced.

  An object of the present invention is to provide a communication terminal device, a moving speed determination device, a moving speed determination method, and a program that can solve the above-described problems.

  The present invention has been made to solve the above-described problems. A communication terminal device according to an aspect of the present invention includes a first communication unit that performs wireless communication by connecting to a first communication network, and a second communication network. A second communication unit that performs wireless communication by connection, a channel estimation unit that performs channel estimation for communication of the first communication unit, and a movement that calculates a moving speed index value based on a channel estimation result of the channel estimation unit A speed index value calculating unit; and a moving speed determining unit that determines whether the moving speed is suitable for use of the second communication unit by comparing the index value of the moving speed with a predetermined threshold. It is characterized by that.

  A moving speed determination device according to another aspect of the present invention includes a speed index value calculating unit that calculates a moving speed index value based on a channel estimation result for communication of the first communication unit, and the moving speed index. A moving speed determining unit that determines whether the moving speed is suitable for use of the second communication unit by comparing the value with a predetermined threshold value.

  A moving speed determination method according to another aspect of the present invention includes a first communication unit that performs wireless communication by connecting to a first communication network, and a second communication unit that performs wireless communication by connecting to a second communication network. A channel estimation step of performing channel estimation for communication of the first communication unit, and an index of movement speed based on a channel estimation result in the channel estimation step A speed index value calculating step for calculating a value, a moving speed determining step for determining whether the moving speed is suitable for use of the second communication unit by comparing the index value of the moving speed with a predetermined threshold value, It is characterized by comprising.

  A program according to another aspect of the present invention includes: a first communication unit that performs wireless communication by connecting to a first communication network; and a second communication unit that performs wireless communication by connecting to a second communication network. A channel estimation step for performing channel estimation for communication of the first communication unit, and a speed index for calculating an index value of a moving speed based on a channel estimation result in the channel estimation step, A value calculating step, and a moving speed determining step for determining whether or not the moving speed is suitable for use of the second communication unit by comparing the index value of the moving speed with a predetermined threshold. It is a program.

  ADVANTAGE OF THE INVENTION According to this invention, the burden on the user at the time of starting a communication part, such as switching of a communication system, can be reduced, suppressing the increase in power consumption.

It is a schematic block diagram which shows the function structure of the communication terminal device in one Embodiment of this invention. In the same embodiment, it is a flowchart which shows the process sequence in which a communication terminal device switches from a 1st communication part to a 2nd communication part. It is a schematic block diagram which shows the minimum structure of the communication terminal device in this invention. It is a schematic block diagram which shows the minimum structure of the moving speed determination apparatus in this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram showing a functional configuration of a communication terminal apparatus according to an embodiment of the present invention. In the figure, a communication terminal device 100 includes a first antenna 110, a first communication unit 120, a second antenna 130, a second communication unit 140, a clock supply unit 150, a power supply unit 160, and a control unit 190. It comprises. The first communication unit 120 includes an RF unit 121, a channel estimation unit 122, and a demodulation / decoding unit 123. The control unit 190 includes a movement speed index value calculation unit 191, a movement speed determination unit 192, a connection determination unit 193, and a switching unit 194.

The communication terminal device 100 is a terminal device capable of communicating by a plurality of wireless communication methods, such as a mobile terminal device (a mobile phone or a smartphone) that can be connected to a wireless LAN (Local Area Network).
The first communication unit 120 is connected to a mobile phone network (a communication network provided for a mobile communication terminal by a communication carrier) via the first antenna 110, and communicates by a communication method of a mobile phone network such as 3G. I do. In the following, processing when the first communication unit 120 receives a signal will be described. However, the first communication unit 120 may be capable of transmitting and receiving or only reception.
The mobile phone network corresponds to an example of a first communication network.

The RF unit 121 performs frequency conversion or analog-digital conversion from the carrier wave to the baseband on the signal received by the first antenna 110, and outputs the obtained signal to the channel estimation unit 122.
The channel estimation unit 122 performs channel estimation for the communication of the first communication unit 120. Specifically, the channel estimation unit 122 uses the known signal (reference signal or pilot signal) included in the reception signal of the first communication unit 120 to receive the first signal from the mobile phone base station. The amount of attenuation and phase rotation that the signal receives in the propagation path to the antenna 110 are estimated. For example, when the first communication unit 120 performs communication using MIMO (Multi-Input Multi-Output), the channel estimation unit 122 calculates a channel estimation matrix.

A known channel estimation method can be used as a method by which the channel estimation unit 122 performs channel estimation.
Channel estimation section 122 outputs the channel estimation result to demodulation / decoding section 123 together with the signal from RF section 121. Further, the channel estimation unit 122 outputs the channel estimation result to the movement speed index value calculation unit 191.

  Demodulation / decoding section 123 performs demodulation processing and decoding processing on the reception signal of first antenna 110 based on the channel estimation result of channel estimation section 122. The demodulation / decoding unit 123 outputs the received data obtained as a result of the processing to the switching unit 194. The reception data here is data obtained by performing processing such as frequency modulation, analog-digital conversion, demodulation processing, and decoding processing on the received signal.

  The second communication unit 140 is connected to the wireless LAN via the second antenna 130 and performs communication using a wireless LAN communication method such as Wi-Fi (registered trademark). In the following, the processing when the second communication unit 140 receives a signal will be described. However, the second communication unit 140 may be capable of transmitting and receiving or only reception. Second communication unit 140 outputs the received data to switching unit 194.

  The second communication unit 140 scans the wireless LAN system when not connected to the wireless LAN. Scan here is transmission / reception of a radio signal for determining whether or not to connect to a wireless communication network. Specifically, the second communication unit 140 scans the wireless LAN system by attempting to receive a wireless LAN beacon.

  The wireless LAN corresponds to an example of a second communication network. For example, as a wireless LAN is represented by Wi-Fi (registered trademark) and a mobile phone network is represented by 3G or LTE (registered trademark), the wireless LAN generally has a higher communication speed than the mobile phone network. . On the other hand, a cellular phone network generally has a wider service area (communication range) than a wireless LAN, and is suitable for mobile communication. Therefore, the mobile phone network is more suitable for communication when the first communication unit 120 is moved than the wireless LAN.

The clock supply unit 150 includes, for example, an oscillation circuit and supplies a clock signal to each unit of the communication terminal device 100. In particular, the clock supply unit 150 switches whether to supply a clock signal to the first communication unit 120 and the second communication unit 140 according to the control of the switching unit 194.
The power supply unit 160 includes a storage battery, for example, and supplies power to each unit of the communication terminal device 100. In particular, the power supply unit 160 switches the presence / absence of power supply to the first communication unit 120 and the second communication unit 140 according to the control of the switching unit 194.

The control unit 190 controls each unit of the communication terminal device 100 to execute various functions. The control unit 190 is realized, for example, when a CPU (Central Processing Unit) included in the communication terminal apparatus 100 reads out and executes a program from a storage device included in the communication terminal apparatus 100.
The movement speed index value calculation unit 191 calculates a movement speed index value based on the channel estimation result of the channel estimation unit 122.

  The index value calculated by the moving speed index value calculating unit 191 may be any index value that indicates the moving speed of the communication terminal apparatus 100, and various index values can be used. For example, the moving speed index value calculation unit 191 may calculate the fading frequency from the channel estimation result, or may calculate the moving speed of the communication terminal apparatus 100 from the fading frequency and the wavelength of the radio wave. . Alternatively, the movement speed index value calculation unit 191 may calculate a frequency fluctuation amount due to the Doppler effect from the frequency rotation amount of the channel estimation result.

The moving speed determination unit 192 determines whether the moving speed is suitable for use by the second communication unit 140 by comparing the moving speed index value calculated by the moving speed index value calculation unit 191 with a predetermined threshold value. .
For example, when the movement speed index value calculation unit 191 calculates the movement speed of the communication terminal apparatus 100, the movement speed determination unit 192 uses the movement speed of the communication terminal apparatus 100 calculated by the movement speed index value calculation unit 191 and a predetermined speed. Compare with the threshold. When the moving speed of the communication terminal device 100 is equal to or lower than the speed threshold, the moving speed determination unit 192 determines that the moving speed is suitable for use of the second communication unit 140. On the other hand, when the moving speed of the communication terminal device 100 is larger than the speed threshold, the moving speed determination unit 192 determines that the moving speed is not suitable for use of the second communication unit 140.

Thus, when the calculation result of the movement speed index value calculation unit 191 indicates that the communication terminal apparatus 100 is stopped or the movement speed of the communication terminal apparatus 100 is relatively low, the movement speed determination unit 192 It is determined that the moving speed is suitable for use of the second communication unit 140.
The moving speed determination unit 192 outputs the determination result to the connection determination unit 193.

When the movement speed determination unit 192 determines that the movement speed is suitable for use of the second communication unit 140, the connection determination unit 193 causes the second communication unit 140 to perform a reception operation (scan), and based on the reception result It is determined whether the second communication unit 140 can connect to the mobile phone network. For example, when the second communication unit 140 receives a wireless LAN beacon with a predetermined signal strength or higher, the connection determination unit 193 determines that the second communication unit 140 is connectable to the mobile phone network. On the other hand, when the beacon is not received or when the signal strength is equal to or lower than the predetermined signal strength, the connection determination unit 193 determines that the second communication unit 140 cannot connect to the mobile phone network.
The connection determination unit 193 outputs the determination result to the switching unit 194.

The switching unit 194 outputs the reception data of the first communication unit 120 or the reception data of the second communication unit 140 to an upper layer such as an application program executed by the control unit 190, for example.
In particular, the switching unit 194 performs switching from the first communication unit 120 to the second communication unit 140 when the connection determination unit 193 determines that the second communication unit 140 can be connected to the mobile phone network. More specifically, the switching unit 194 stops the first communication unit 120 and causes the second communication unit 140 to take over the data reception performed by the first communication unit 120. Then, the switching unit 194 switches the data output to the upper layer from the reception data of the first communication unit 120 to the reception data of the second communication unit 140.

Note that the switching unit 194 may use the first communication unit 120 and the second communication unit 140 in combination instead of switching between the first communication unit 120 and the second communication unit 140. That is, the switching unit 194 may cause the second communication unit 140 to receive data without stopping the first communication unit 120.
The first communication network is not limited to the mobile phone network, and the second communication network is not limited to the wireless LAN. It suffices if the first communication network is suitable for communication during movement in comparison with the second communication network and channel estimation is possible.

Moreover, the premise for the switching unit 194 to switch from the first communication unit 120 to the second communication unit 140 is not limited to the communication speed of the second communication network being faster than the first communication network communication speed. For example, when the security of the second communication network is higher than that of the first communication network, when the stability is higher, or when the communication fee is lower, the switching unit 194 causes the second communication network to communicate with the second communication. Switching to the unit 140 can be considered.
Further, the switching unit 194 may perform switching according to the user operation without automatically switching between the first communication unit 120 and the second communication unit 140. In this case, the communication terminal device 100 may notify the determination result of the moving speed determination unit 192 or the determination result of the connection determination unit 193 (for example, display on a display screen of the communication terminal device 100).

Next, the operation of communication terminal apparatus 100 will be described with reference to FIG.
FIG. 2 is a flowchart illustrating a processing procedure in which the communication terminal device 100 performs switching from the first communication unit 120 to the second communication unit 140. The communication terminal device 100 can be executed by using either the first communication unit 120 or the second communication unit 140, for example, when data is downloaded from a server on the Internet via a mobile phone network. When the first process is started using the first communication unit 120, the process of FIG. 2 is performed in parallel with the process. Note that the parallel processing here may be parallel processing or time-division processing.

  In the process of FIG. 2, the moving speed index value calculation unit 191 first waits for the elapse of a predetermined period set as a scan period (step S101). When the scan cycle elapses, the moving speed index value calculation unit 191 acquires the channel estimation result for the communication of the first communication unit 120 from the channel estimation unit 122 (step S102). Note that the channel estimation unit 122 may output the result of channel estimation performed when the first communication unit 120 performs communication to the movement speed index value calculation unit 191. That is, it is not necessary for the channel estimation unit 122 to perform channel estimation specially for output to the movement speed index value calculation unit 191.

Next, the moving speed index value calculation unit 191 calculates an index value of the moving speed of the communication terminal apparatus 100 based on the channel estimation result obtained in step S102 (step S103).
Then, the moving speed determination unit 192 determines whether the moving speed is suitable for use by the second communication unit 140 by comparing the moving speed index value calculated by the moving speed index value calculation unit 191 with a predetermined threshold. Determination is made (step S104).

If it is determined in step S104 that the moving speed is not suitable for use of the second communication unit 140 (step S104: NO), the process returns to step S101.
On the other hand, when it determines with it being a moving speed suitable for use of the 2nd communication part 140 in step S104 (step S104: YES), the connection determination part 193 starts the 2nd communication part 140 (step S111). Specifically, the connection determination unit 193 controls the clock supply unit 150 and the power supply unit 160 via the switching unit 194 to supply a clock signal and power to the second communication unit 140, so that the second communication The unit 140 is activated.

Then, when the second communication unit 140 is activated and becomes communicable, it scans the wireless LAN system (step S112). Specifically, the second communication unit 140 attempts to receive a wireless LAN beacon.
Next, the connection determination unit 193 determines whether or not the communication terminal device 100 is located within the wireless LAN service area based on the scan result of the second communication unit 140 in step S112 (the second communication unit 140 is connected to the wireless LAN). It is determined whether or not connection is possible (step S113).

  If it is determined in step S113 that the communication terminal device 100 is located outside the service area of the wireless LAN (step S113: NO), the connection determination unit 193 stops the second communication unit 140 (step S121). Specifically, the connection determination unit 193 controls the clock supply unit 150 and the power supply unit 160 via the switching unit 194 to stop the clock signal supply and the power supply to the second communication unit 140.

  On the other hand, when it is determined in step S113 that the communication terminal device 100 is located within the wireless LAN service area (step S113: YES), the switching unit 194 switches from the first communication unit 120 to the second communication unit 140. This is performed (step S131). Specifically, the switching unit 194 performs processing of stopping the first communication unit 120, connecting the second communication unit 140 to the wireless LAN, and switching connection from the first communication unit 120 to the second communication unit 140. I do.

In the stop process of the first communication unit 120, the switching unit 194 controls the clock supply unit 150 and the power supply unit 160 to stop the clock signal supply and the power supply to the first communication unit 120.
In the process of connecting the second communication unit 140 to the wireless LAN, the switching unit 194 causes the second communication unit 140 to take over the communication (for example, data download) performed by the first communication unit 120.
In the connection switching process from the first communication unit 120 to the second communication unit 140, the switching unit 194 outputs the reception data of the first communication unit 120 to the upper layer. To output to the upper layer.

After step S131, the process of FIG.
Note that the communication terminal device 100 performs an interrupt process when the process using the first communication unit 120 (for example, data download) is completed before switching from the first communication unit 120 to the second communication unit 140. The process of FIG. 2 is terminated.

As described above, the movement speed index value calculation unit 191 calculates the movement speed index value based on the channel estimation result of the channel estimation unit 122. Then, the moving speed determination unit 192 determines whether or not the moving speed is suitable for use of the second communication unit 140 by comparing the moving speed index value with a predetermined threshold.
Accordingly, the moving speed index value calculation unit 191 can calculate the moving speed index value of the communication terminal apparatus 100 based on the result of channel estimation performed by the channel estimation unit 122 during communication of the first communication unit 120. . Then, the moving speed determination unit 192 can determine whether the moving speed is suitable for use by the second communication unit 140 based on the moving speed index value calculated by the moving speed index value calculation unit 191. .

Therefore, the channel estimation unit 122 does not need to perform channel estimation specially because the movement speed determination unit 192 determines whether the movement speed is suitable for use of the second communication unit 140. In this respect, an increase in power consumption of the communication terminal device 100 can be suppressed.
Further, the communication terminal device 100 does not need to be provided with a dedicated device for detecting the moving speed of the communication terminal device 100, such as an acceleration sensor or GPS, and in this respect, the increase in the scale and power consumption of the device is suppressed. be able to.

  In addition, when the moving speed determination unit 192 determines that the moving speed is suitable for use of the second communication unit 140, the second communication unit 140 is activated so that the second communication unit 140 can be used. It can be avoided that the second communication unit 140 is activated in an unsuitable situation. In this respect, an increase in power consumption of the communication terminal device 100 can be suppressed. The activation of the second communication unit 140 here is not limited to activation for communication execution, but includes activation for determining whether or not connection to the communication network is possible.

  For example, when the communication terminal device 100 is moving outdoors and located outside the service area of the second communication network, the second communication unit 240 is avoided from being activated, and the power consumption of the communication terminal device 100 is increased. Can be suppressed. Further, even when the second communication unit 140 is activated, the situation where the communication terminal device 100 immediately moves out of the service area of the second communication network and communication with the second communication unit 140 cannot be avoided is avoided. Thus, an increase in power consumption of the communication terminal device 100 can be suppressed.

In addition, when the movement speed determination unit 192 determines that the movement speed is suitable for use of the second communication unit 140, the second communication unit 140 automatically starts without requiring a user operation. As described above, it is possible to reduce the burden on the user when starting up the communication unit while suppressing an increase in power consumption of the communication terminal device 100.
Alternatively, when the user performs an activation operation of the second communication unit such as a switching operation from the first communication unit 120 to the second communication unit 140, the communication terminal device 100 notifies the determination result of the moving speed determination unit 192. (For example, display on the screen). By referring to the determination result of the moving speed determination unit 192, the user can avoid performing the activation operation of the second communication unit 140 in a situation that is not suitable for use of the second communication unit 140. Thereby, the burden which a user performs starting operation of the 2nd communication part 140 can be reduced, suppressing the increase in the power consumption of the communication terminal device 100 as mentioned above.

  For example, it is possible to prevent the user from performing a switching operation from the first communication unit 120 to the second communication unit 140 when the communication terminal device 100 is moving outdoors and located outside the service area of the wireless LAN. Further, even if the user performs a switching operation from the first communication unit 120 to the second communication unit 140, the communication terminal apparatus 100 immediately moves out of the service area of the wireless LAN, and the second communication unit 140 The situation where communication cannot be performed can be avoided.

In addition, when the movement speed determination unit 192 determines that the movement speed is suitable for use of the second communication unit 140, the connection determination unit 193 causes the second communication unit 140 to perform a reception operation (scan) and display the reception result. Based on this, it is determined whether the second communication unit 140 is connectable to the second communication network (in this embodiment, a wireless LAN). When the connection determination unit 193 determines that the second communication unit 140 is connectable to the second communication network, the switching unit 194 performs switching from the first communication unit 120 to the second communication unit 140.
Thereby, when the moving speed determination unit 192 determines that the moving speed is not suitable for the use of the second communication unit 140, it is possible to suppress scanning of the wireless LAN system by the second communication unit 140. In this respect, an increase in power consumption of the communication terminal device 100 can be suppressed.

  For example, when the communication terminal device 100 is moving outdoors and located outside the wireless LAN service area, the second communication unit 140 is prevented from scanning the wireless LAN system, and the power consumption of the communication terminal device 100 is reduced. Can be suppressed. Further, even when the connection determination unit 193 switches from the first communication unit 120 to the second communication unit 140, the communication terminal device 100 immediately moves out of the service area of the wireless LAN, and the second communication unit It is possible to avoid a situation in which communication at 140 cannot be performed and to suppress an increase in power consumption of the communication terminal device 100.

  Further, the switching unit 194 automatically switches the communication method from the communication method of the mobile phone network to the communication method of the wireless LAN without requiring a user operation based on the determination result of the moving speed determination unit 192. And the burden on the user can be reduced.

Next, the minimum configuration in the present invention will be described with reference to FIGS.
FIG. 3 is a schematic block diagram showing the minimum configuration of the communication terminal apparatus according to the present invention.
In the figure, the communication terminal device 200 includes a first communication unit 220, a second communication unit 240, a movement speed index value calculation unit 291, and a movement speed determination unit 292. The first communication unit 220 includes a channel estimation unit 222.

The first communication unit 220 connects to the first communication network and performs wireless communication.
The channel estimation unit 222 performs channel estimation for the communication of the first communication unit 220.
The second communication unit 240 performs wireless communication by connecting to the second communication network.
The movement speed index value calculation unit 291 calculates a movement speed index value based on the channel estimation result of the channel estimation unit 222.
The movement speed determination unit 292 determines whether the movement speed is suitable for use by the second communication unit 240 by comparing the movement speed index value calculated by the movement speed index value calculation unit 291 with a predetermined threshold value. .

  Thereby, as in the case of the communication terminal device 100 (FIG. 1), the moving speed index value calculation unit 291 is based on the result of channel estimation performed by the channel estimation unit 222 during communication of the first communication unit 220. An index value of 200 moving speeds can be calculated. Then, the moving speed determination unit 292 can determine whether the moving speed is suitable for use of the second communication unit 240 based on the moving speed index value calculated by the moving speed index value calculation unit 291. .

Therefore, the channel estimation unit 222 does not need to perform channel estimation specially because the movement speed determination unit 292 determines whether or not the movement speed is suitable for use of the second communication unit 240. In this respect, an increase in power consumption of the communication terminal device 200 can be suppressed.
Further, the communication terminal device 200 does not need to be provided with a dedicated device for detecting the moving speed of the communication terminal device 200, such as an acceleration sensor or GPS, and in this respect, the increase in the scale and power consumption of the device is suppressed. be able to.

  In addition, when the moving speed determination unit 292 determines that the moving speed is suitable for use of the second communication unit 240, the second communication unit 240 is activated so that the second communication unit 240 can be used. It can be avoided that the second communication unit 240 is activated in an unsuitable situation. In this respect, an increase in power consumption of the communication terminal device 200 can be suppressed. The activation of the second communication unit 240 here is not limited to activation for communication execution, but includes activation for determining whether or not connection to the communication network is possible.

  For example, when the communication terminal device 200 is moving outdoors and located outside the service area of the second communication network, the second communication unit 240 is avoided from being activated, and the power consumption of the communication terminal device 200 is increased. Can be suppressed. In addition, even if the second communication unit 240 is activated, the situation where the communication terminal device 200 immediately moves out of the service area of the second communication network and cannot communicate with the second communication unit 240 is avoided. Thus, an increase in power consumption of the communication terminal device 200 can be suppressed.

Further, when the moving speed determination unit 292 determines that the moving speed is suitable for use of the second communication unit 240, the second communication unit 240 automatically starts without requiring a user operation. As described above, it is possible to reduce the burden on the user when starting up the communication unit while suppressing an increase in power consumption of the communication terminal device 200.
Alternatively, when the user performs an activation operation of the second communication unit such as a switching operation from the first communication unit 220 to the second communication unit 240, the communication terminal device 200 notifies the determination result of the moving speed determination unit 292. (For example, display on the screen). By referring to the determination result of the moving speed determination unit 292, the user can avoid starting the second communication unit 240 in a situation that is not suitable for use of the second communication unit 240. Thereby, the burden which a user performs starting operation of the 2nd communication part 240 can be reduced, suppressing the increase in the power consumption of the communication terminal device 200 as mentioned above.

It should be noted that the present invention can also be implemented as a moving speed determination device including a moving speed index value calculation unit and a movement speed determination unit.
FIG. 4 is a schematic block diagram showing the minimum configuration of the moving speed determination device according to the present invention. In the figure, the moving speed determination device 300 includes a moving speed index value calculation unit 391 and a moving speed determination unit 392.

The movement speed index value calculation unit 391 acquires a channel estimation result, and calculates an index value of movement speed based on the obtained channel estimation result.
The moving speed determination unit 392 determines whether the moving speed is suitable for use by a predetermined communication unit by comparing the moving speed index value calculated by the moving speed index value calculation unit 391 with a predetermined threshold value.
By applying the moving speed determination device 300 to the communication terminal device, the same effect as that of the communication terminal device 200 (FIG. 3) can be obtained.

A program for realizing all or a part of the functions of communication terminal apparatus 100 or 200 or moving speed determination apparatus 300 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is stored in a computer. The processing of each unit may be performed by reading it into the system and executing it. Here, the “computer system” includes an OS and hardware such as peripheral devices.
Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

100, 200 Communication terminal device 110 First antenna 120, 220 First communication unit 121 RF unit 122, 222 Channel estimation unit 123 Demodulation / decoding unit 130 Second antenna 140, 240 Second communication unit 150 Clock supply unit 160 Power supply unit 190 Control unit 191, 291, 391 Movement speed index value calculation unit 192, 292, 392 Movement speed determination unit 193 Connection determination unit 194 switching unit 300 Movement speed determination device

Claims (5)

A first communication unit connected to the first communication network for wireless communication;
A second communication unit for connecting to the second communication network and performing wireless communication;
A channel estimation unit for performing channel estimation for communication of the first communication unit;
A moving speed index value calculating unit that calculates a moving speed index value based on the channel estimation result of the channel estimating unit;
A moving speed determination unit that determines whether the moving speed is suitable for use of the second communication unit by comparing the index value of the moving speed with a predetermined threshold;
A communication terminal apparatus comprising: When the movement speed determination unit determines that the movement speed is suitable for use of the second communication unit, the second communication unit performs a reception operation, and the second communication unit performs the second operation based on a reception result. A connection determination unit that determines whether or not connection to a communication network is possible;
When the connection determination unit determines that the second communication unit is connectable to the second communication network, a switching unit that performs switching from the first communication unit to the second communication unit;
The communication terminal apparatus according to claim 1, comprising: A speed index value calculation unit that calculates an index value of the moving speed based on a channel estimation result for communication of the first communication unit;
A moving speed determination unit that determines whether the moving speed is suitable for use of the second communication unit by comparing the index value of the moving speed with a predetermined threshold;
A moving speed determination device comprising: A first communication unit connected to the first communication network for wireless communication;
A second communication unit for connecting to the second communication network and performing wireless communication;
A method for determining a moving speed of a communication terminal device comprising:
A channel estimation step for performing channel estimation for communication of the first communication unit;
A speed index value calculating step for calculating an index value of the moving speed based on a channel estimation result in the channel estimation step;
A moving speed determination step of determining whether or not the moving speed is suitable for use of the second communication unit by comparing the index value of the moving speed with a predetermined threshold;
A moving speed determination method comprising: A first communication unit connected to the first communication network for wireless communication;
A second communication unit for connecting to the second communication network and performing wireless communication;
A computer for controlling a communication terminal device comprising:
A channel estimation step for performing channel estimation for communication of the first communication unit;
A speed index value calculating step for calculating an index value of the moving speed based on a channel estimation result in the channel estimation step;
A moving speed determination step of determining whether or not the moving speed is suitable for use of the second communication unit by comparing the index value of the moving speed with a predetermined threshold;
A program for running

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