JP2013115543A - Radio communication terminal and communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication terminal and a communication control method that lengthen the usable time of a battery in a radio communication terminal compatible with a plurality of communication methods.SOLUTION: A radio communication terminal compatible with a plurality of communication methods comprises buffer memories for storing transmission data and outputting data depending on respective communication methods. A signal related to data output from the buffer memories is amplified by a radio communication unit, and then transmitted as a radio signal. The radio communication terminal controls data output such that during data transmission according to any of the communication methods, data output from the buffer memories compatible with the other communication methods will be stopped. This prevents data output by the plurality of communication methods at the same time and makes sure that amplification and the like of a signal at the radio communication unit is not performed by the plurality of communication methods at the same time.

Description

  The present invention relates to a wireless communication terminal and a communication control method compatible with a plurality of wireless communication systems, and more particularly to control of power consumption.

  Wireless communication terminals compatible with a plurality of wireless communication systems are widely used. For example, there is a wireless communication terminal that performs voice communication by a CDMA (Code Division Multiple Access) method and performs data communication by LTE (Long Term Evolution) or WiFi. The wireless communication terminal has a configuration such as an antenna and an amplifier corresponding to each communication method.

  An example in which such a plurality of communication methods are used simultaneously is also increasing. For example, the number of wireless communication terminals compatible with SV-LTE (Simultaneous Voice-Long Term Evolution) capable of executing voice communication and data communication simultaneously is increasing worldwide. In this case, the wireless communication terminal can perform voice communication (such as CDMA) while being downloaded by data communication (such as LTE).

  Also, there is an example in which a wireless communication terminal is connected to a plurality of information communication devices such as a PC (Personal Computer), a tablet terminal, and a portable game machine by WiFi, and the wireless communication terminal functions as a mobile router (Non-patent Document 1). reference). This is also referred to as a WiFi tethering function. Accordingly, the user can connect these information communication devices to the Internet using the communication method of the wireless communication terminal.

KDDI Corporation Press Release (September 28, 2011) “Starts offering tethering service“ Attach WiFi ”using au mobile phones”, [Search November 1, 2011], Internet (http: // www. kddi.com/corporate/news_release/2011/0928/index.html)

  However, when a plurality of communication methods are used at the same time, the configuration (RF unit, power amplifier, etc.) corresponding to each communication method operates at the same time, and power consumption increases. is there.

  In view of the above, an object of the present invention is to provide a long-lasting battery charge in a wireless communication terminal that supports a plurality of communication methods.

  In order to solve the above problems, the present invention has the following configuration. The present invention is a wireless communication terminal that supports a plurality of communication methods, and stores a first buffer memory that accumulates transmission data according to the first communication method and outputs the data, and stores transmission data according to the second communication method. When one of the second buffer memory that outputs data, the wireless communication unit that amplifies the signal for data output and sends it as a wireless signal, and the first and second buffer memories are outputting data A buffer control unit for stopping data output from the other buffer memory.

  In addition, the buffer control unit may periodically switch the buffer memory that outputs data among the first and second buffer memories.

  In addition, the buffer control unit performs switching by setting the data output period for the buffer memory corresponding to the low-speed one of the plurality of communication methods longer than the data output period of the buffer memory corresponding to the high-speed communication method. It is good.

  In addition, the buffer control unit sets the data output period of each of the first and second buffer memories so that the data transmission amount of each communication method is equal within a predetermined time according to the effective speed of the wireless communication of each communication method. It may be set and switched.

  The wireless communication terminal has a tethering function that functions as a mobile router of the information communication device by connecting to one or more other information communication devices by any of the communication methods, and the buffer control unit connects Switching may be performed by setting the data output period of each of the first and second buffer memories in accordance with at least one of the type and number of information communication devices.

  The communication method includes wireless communication based on the IEEE 802.11 standard, and the wireless communication terminal functions as a mobile router of the information communication device by connecting to other information communication devices using the communication method based on the IEEE 802.11 standard. It is good also as what you do.

  In addition, the buffer control unit may perform switching by setting the data output periods of the first and second buffer memories according to the history of the communication amount of each communication method.

  Further, the buffer control unit may perform switching by setting the data output period of each of the first and second buffer memories according to the data accumulation amount of each of the first and second buffer memories.

  The communication method includes wireless communication based on the IEEE 802.11 standard, and the wireless communication terminal is connected to a plurality of other information communication devices using the communication method based on the IEEE 802.11 standard and functions as a mobile router of the information communication device. And the buffer control unit stops the data output from the other buffer memory when one of the first and second buffer memories is outputting data at the start of operation as a mobile router. The restriction process may be started.

  The present invention also supports a plurality of communication systems, and stores a first buffer memory that stores transmission data according to the first communication system and outputs data, and stores transmission data according to the second communication system and outputs data. A communication control method in a wireless communication terminal comprising: a second buffer memory that performs a data output and a wireless communication unit that amplifies a signal for data output and transmits the signal as a wireless signal. Of these, the communication control method includes a buffer control step of stopping data output from the other buffer memory while either one is outputting data.

  In a wireless communication terminal, there is usually a wireless communication unit that includes a power amplifier or the like for wireless communication for each communication method and performs signal amplification. The wireless communication unit includes a power amplifier and the like, so that power consumption is relatively large.

  On the other hand, according to the present invention, it is possible to provide a wireless communication terminal and a communication control method capable of maintaining charging of a battery for a long time by controlling power required for communication.

It is a figure which shows the structural example of the mobile communication system 1 containing the radio | wireless communication terminal 100 concerning this invention. It is a functional block diagram of the radio | wireless communication terminal 100 of this invention. It is a flowchart which shows operation | movement of the radio | wireless communication terminal 100 at the time of exhibiting a WiFi tethering function. It is a figure which shows the case where the data output period of the LTE buffer 34 and the WiFi buffer 44 is made into a fixed period. It is a figure which shows the case where the data output period of the LTE buffer 34 and the WiFi buffer 44 is made into a fixed period according to the communication speed of a communication system. It is a figure which shows the case where the data output period of the LTE buffer 34 and the WiFi buffer 44 is changed according to a communication environment.

1 Overall Configuration Hereinafter, a wireless communication terminal 100 according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration example of a mobile communication system 1 including a wireless communication terminal 100 according to the present invention.

  As shown in FIG. 1, the mobile communication system 1 includes a radio communication terminal 100, a CDMA base station 200, an LTE base station 300, and a radio communication device group 400.

  The CDMA base station 200 is a radio base station compatible with the CDMA 1x system. The CDMA base station 200 is connected to the wireless communication terminal 100 through a communication path 201 (CDMA 1x method) and corresponds to the voice communication method by the wireless communication terminal 100.

  The LTE base station 300 is a radio base station that supports the LTE scheme. The LTE base station 300 is connected to the radio communication terminal 100 through a communication path 301 (LTE method), and supports data communication by the radio communication terminal 100.

  The wireless communication device group 400 is an information communication device capable of wireless communication by a WiFi method (for example, IEEE 802.11n standard). The information communication device is, for example, a game hardware 411, a mobile PC 412, a mobile game machine 413, or the like as shown in FIG. The information communication devices included in the wireless communication device group 400 can communicate with the wireless communication terminal 100 via WiFi, and when the wireless communication terminal 100 functions as a mobile router (WiFi tethering), it is connected to the Internet via the communication path 401. can do.

2 Configuration of Radio Communication Terminal 100 FIG. 2 is a functional block diagram of the radio communication terminal 100.

2.1 Configuration of Radio Communication Terminal 100 As shown in FIG. 2, the radio communication terminal 100 includes a CDMA radio communication unit 21, a CDMA antenna 22, an LTE radio communication unit 31, an LTE antenna 32, and a WiFi radio communication unit. 41, WiFi antenna 42, baseband unit 10, display unit 6, audio output unit 7, audio input unit 8, and operation unit 9.

  The CDMA wireless communication unit 21 includes a voice RF_IC 25. The audio RF_IC 25 converts a signal from the baseband unit 10 into an antenna transmission frequency, and converts an antenna reception signal into a frequency that can be processed by the baseband unit 10.

  The CDMA wireless communication unit 21 corresponds to a communication method using CDMA. When a CDMA antenna 22 receives a radio signal for data communication from another radio communication terminal or a web server connected to the Internet via the CDMA base station 200, the CDMA radio communication unit 21 Signal processing or the like is performed by the audio RF_IC 25 and output to the baseband unit 10.

  Further, the CDMA radio communication unit 21 performs signal processing or the like on the transmission signal generated by the baseband unit 10 by the voice RF_IC 25, and transmits the processed transmission signal to the CDMA base station 200 through the CDMA antenna 22. Via a wireless communication terminal or a communication device connected to the Internet.

  The LTE wireless communication unit 31 and the WiFi wireless communication unit 41 exhibit substantially the same functions as the CDMA wireless communication unit 21. The difference from the CDMA wireless communication unit 21 is that the LTE wireless communication unit 31 is compatible with the LTE system, and the WiFi wireless communication unit 41 is compatible with WiFi. More specifically, the LTE wireless communication unit 31 includes a data communication RF_IC 35. The data communication RF_IC 35 converts a signal from the baseband unit 10 into an antenna transmission frequency, and converts an antenna reception signal into a frequency that can be processed by the baseband unit 10.

  The LTE wireless communication unit 31 corresponds to a communication method based on LTE. When a radio signal related to data communication is received by the LTE antenna 32 via the LTE base station 300, the LTE radio communication unit 31 performs signal processing or the like on the received signal by the data communication RF_IC 35 to the baseband unit 10. Output.

  In addition, the LTE wireless communication unit 31 performs signal processing and the like on the transmission signal generated by the baseband unit 10 by the data communication RF_IC 35, and transmits the processed transmission signal to the LTE base station 300 through the LTE antenna 32. To send through.

  Similarly, the WiFi wireless communication unit 41 includes a WiFi RF_IC 45. The WiFi RF_IC 45 converts the signal from the baseband unit 10 into an antenna transmission frequency, and converts the antenna reception signal into a frequency that can be processed by the baseband unit 10.

  The WiFi wireless communication unit 41 corresponds to a communication method using WiFi. When the wireless signal from the wireless communication device group 400 is received by the WiFi antenna 42, the WiFi wireless communication unit 41 performs signal processing on the received signal by the WiFi RF_IC 45 and outputs the signal to the baseband unit 10.

  In addition, the WiFi wireless communication unit 41 performs signal processing or the like on the transmission signal generated by the baseband unit 10 using the WiFi RF_IC 45, and transmits the processed transmission signal through the WiFi antenna 42.

  Each of the CDMA wireless communication unit 21, the LTE wireless communication unit 31, and the WiFi wireless communication unit 41 includes a power amplifier (not shown), and amplifies the signal to transmit a signal from each antenna.

  The baseband unit 10 includes a storage unit 13, a buffer control unit 16, a CDMA processing unit 23, an LTE processing unit 33, an LTE buffer 34, a WiFi processing unit 43, and a WiFi buffer 44. The baseband unit 10 includes a CPU (Central Processing Unit) (not shown). When the CPU reads out and executes the program stored in the storage unit 13, the baseband unit 10 performs functions of the buffer control unit 16 and the like to manage the operation of the wireless communication terminal 100 in an integrated manner.

  The storage unit 13 includes a ROM (Read Only Memory) and a RAM (Random Access Memory).

  The CDMA processing unit 23 supports communication by the CDMA system, and performs modulation processing and demodulation processing on transmitted / received data.

  The LTE processing unit 33 supports communication using the LTE scheme, and performs modulation processing and demodulation processing on data to be transmitted and received.

  The WiFi processing unit 43 supports communication based on the IEEE 802.11 standard, and performs modulation processing and demodulation processing on data to be transmitted and received.

  The LTE buffer 34 is a buffer memory for storing data transmitted by the LTE wireless communication unit 31.

  The WiFi buffer 44 is a buffer memory for storing data to be transmitted by the WiFi wireless communication unit 41.

  The buffer control unit 16 controls the data output of the LTE buffer 34 and the WiFi buffer 44 so that transmission by the LTE wireless communication unit 31 and the WiFi wireless communication unit 41 is not performed at the same time during data transmission. Details will be described later.

  The display unit 6 includes a display and the like, and is controlled by the baseband unit 10 to display various information such as characters, symbols, and graphics.

  The audio output unit 7 includes a speaker or the like, converts audio data from the baseband unit 10 into audio, and outputs the audio to the outside.

  The audio input unit 8 includes a microphone or the like, converts audio input from the outside into audio data, and outputs the audio data to the baseband unit 10.

  The operation unit 9 includes a keypad and the like, detects an operation from the user, and outputs it to the baseband unit 10.

3 Operation of Wireless Communication Terminal 100 Next, the operation of the wireless communication terminal 100 will be described.

  In the description of the present embodiment, when the wireless communication terminal 100 functions as a mobile router of the information communication device of the wireless communication device group 400 by WiFi tethering, the data communication RF_IC 35 and the WiFi RF_IC 45 at the time of data transmission from the wireless communication terminal 100 are used. By using either one of them and restricting the use of the other, the power consumption within a predetermined time in the LTE wireless communication unit 31 and the WiFi wireless communication unit 41 is mainly reduced. In order to realize this, the buffer control unit 16 switches data output of transmission buffers (LTE buffer 34 and WiFi buffer 44) for transmitting data at predetermined intervals.

This will be specifically described below.
3.1 Operation when Activating WiFi Tethering Application When the wireless communication terminal 100 receives a setting for exerting the WiFi tethering function by a user operation or the like, the wireless communication terminal 100 controls data output of the LTE buffer 34 and the WiFi buffer 44 described above.

  FIG. 3 is a flowchart showing the operation of the wireless communication terminal 100 when the WiFi tethering function is exhibited.

  As illustrated in FIG. 3, when the baseband unit 10 starts setting of the WiFi tethering function by a user operation or the like, the baseband unit 10 receives a setting for causing the wireless communication terminal 100 to function as a mobile router from the user (S301). For example, since an external information communication device connects to the wireless communication terminal 100 via WiFi, a router name (SSID: Service Set ID), an encryption method, a password, and the like for the wireless communication terminal 100 to function as a mobile router are set. .

  Since the baseband unit 10 manages information communication devices to be connected by WiFi tethering, the baseband unit 10 receives a setting as to which information communication device is permitted to connect (S303). The baseband unit 10 accepts the setting of the maximum number (upper limit) of information communication devices connected to the Internet.

  When the setting of WiFi tethering is completed, the baseband unit 10 performs communication by WiFi tethering by switching the data output of the buffers of the LTE buffer 34 and the WiFi buffer 44 at a predetermined cycle by the buffer control unit 16 (S305). Details will be described later.

  The baseband unit 10 controls the data output of the LTE buffer 34 and the WiFi buffer 44 through the above-described step S305 until the communication by WiFi tethering ends (S307: NO). When the communication by WiFi tethering ends (for example, the user performs an operation to end WiFi tethering), the baseband unit 10 ends the control of data output of the LTE buffer 34 and the WiFi buffer 44 by the buffer control unit 16 (S309). ).

4 Output Control of Each Buffer Next, the processing of the buffer control unit 16 in step S305 will be described. In the baseband unit 10, the buffer control unit 16 controls data output from the buffer so that transmission data is output from either the LTE buffer 34 or the WiFi buffer 44. There are various ways to determine the period for outputting data or stopping data output.

For example, (1) the period may be fixed regardless of the communication environment.
Also, (2) the wireless communication terminal 100 such as what communication speed is used for each communication method, and how many types and number of information communication devices are connected to the wireless communication terminal 100 by WiFi. The period may be determined according to the external communication environment.

  Further, (3) the period may be determined according to the internal state of the wireless communication terminal 100 such as the usage state of the LTE buffer 34 or the WiFi buffer 44.

4.1 When the Period is Fixed FIG. 4 is a diagram illustrating a case where the data output period of the LTE buffer 34 and the WiFi buffer 44 is a fixed period.

  As shown in the figure, the baseband unit 10 may use the buffer control unit 16 to alternately switch the data output from the buffer memory of the LTE buffer 34 and the WiFi buffer 44 at a cycle Tp. The buffer control unit 16 outputs data from the buffer memory or stops data output at every cycle Tp so that data is output from either one of the LTE buffer 34 and the WiFi buffer 44.

  FIG. 5 is a diagram illustrating a case where the data output period of the LTE buffer 34 and the WiFi buffer 44 is set to a fixed period according to the communication speed of the communication method.

  In the figure, the length of one section of data output from the LTE buffer 34 is TA, and the length of one section of data output from the WiFi buffer 44 is TB. Period TA> TB. The length of one section of data output for each communication method is stored in the storage unit 13 in advance. In this example, one section of data transmission from the buffer memory in the case of communication by the LTE system is extended between the LTE system and WiFi.

4.2 When changing the cycle according to the external communication environment (Control according to the communication speed, etc.)
Since the communication environment of the wireless communication terminal changes every moment, the communication speed of each communication method also changes according to time and place. Therefore, by providing the wireless communication terminal 100 with a configuration for measuring the communication speed of each communication method, the timing of switching the data output from the buffer by the buffer control unit 16 can be made in accordance with the communication environment. For example, it is conceivable to increase the period of one section for transmitting data from the buffer memory as the communication method has a slower communication speed.

  FIG. 6 is a diagram illustrating a case where the data output periods of the LTE buffer 34 and the WiFi buffer 44 are changed according to the communication environment.

  In the figure, the ratio of the data output period of the LTE buffer 34 and the WiFi buffer 44 is T1: T2, but at time t1, it becomes T3: T4, and the data output period of the LTE buffer 34 becomes relatively long. It is shown that. For example, as shown in the figure, in response to measurement results such as (1) the communication speed by the LTE system has dropped below a predetermined value, (2) the signal reception strength from the LTE base station 300 has dropped below a predetermined value, etc. The data output period from the buffer memory is changed for each communication method.

  As shown in the figure, the data output period from the buffer memory may be dynamically changed even after simultaneous communication using a plurality of communication methods is started.

(Control according to the type and number of information communication devices)
In addition, when the wireless communication terminal 100 is used as a mobile router, a plurality of information communication devices can be connected to the wireless communication terminal 100 via WiFi. Here, it may be determined depending on the information communication device how much the information communication device connected by WiFi performs communication. For example, in the case of an information communication device for reproducing a moving image or the like, the communication amount becomes relatively large.

  For this reason, the timing of switching data output from the buffer by the buffer control unit 16 may be set according to the type of information communication device connected to the wireless communication terminal 100 by WiFi. That is, the length of one section in which the buffer control unit 16 outputs data by the WiFi buffer 44 is determined according to the type of information communication device connected to the wireless communication terminal 100 by WiFi. For example, when the PC is connected to the wireless communication terminal 100 by WiFi, one section for outputting data from the WiFi buffer 44 is made relatively long. On the other hand, when a terminal having a relatively small amount of data communication is connected to the wireless communication terminal 100 by WiFi, one section for outputting data from the WiFi buffer 44 may be shortened.

  Further, when an information communication device is connected to the wireless communication terminal 100 by WiFi as described above, the amount of communication by WiFi may be determined depending on the number of information communication devices connected to the wireless communication terminal 100. Therefore, the timing of switching data output from the buffer by the buffer control unit 16 may be set according to the number of information communication devices connected to the wireless communication terminal 100 by WiFi. For example, the length of one section of the period during which the buffer control unit 16 transmits data using the WiFi buffer 44 is set for each number of information communication devices connected to the wireless communication terminal 100 by WiFi.

  The process of setting the period for transmitting data from the buffer memory as described above may be executed every time an information communication device is newly connected or disconnected.

4.3 When the period is determined according to the data transmission status in the wireless communication terminal 100 The larger the amount of data stored in each buffer memory, the more data to be transmitted remains. In addition, a communication method having a large past communication volume is used more frequently. Therefore, the data transmission interval of the buffer memory by the buffer control unit 16 may be determined according to such a data transmission situation.

(Control according to past communication performance)
In addition to this, the period of data output from the buffer memory may be set based on the communication history of the communication method. For example, the timing of switching the data output from the buffer by the buffer control unit 16 may be changed in accordance with the communication amount by the LTE system and the history of the communication amount by WiFi.

  For example, the greater the amount of traffic, the longer the data transmission period of each buffer memory by the buffer control unit 16 may be considered as a communication method that is often used.

(Control according to buffer accumulation amount)
Further, in the LTE buffer 34 and the WiFi buffer 44, the larger the amount of data stored in the buffer memory, the more data to be transmitted remains. Therefore, the buffer control is performed according to the amount of data stored in each buffer memory. The timing of switching data output from the buffer by the unit 16 may be changed.

  For example, when the amount of data stored in the buffer memory exceeds a predetermined threshold, one section of data transmission in the buffer memory is lengthened. For example, when the amount of data stored in the LTE buffer 34 exceeds a predetermined ratio, the buffer control unit 16 lengthens one section during which data is transmitted from the LTE buffer 34. As in the example of FIG. 6, one section of the period for transmitting data from the LTE buffer 34 is increased from T1 to T3 (the ratio of the length of one section of the data transmission period to the WiFi buffer 44 of the LTE buffer 34 is increased). To do).

(Specific situation)
When the data transmission period of each buffer memory is controlled as described above, specifically, there are the following situations. For example, it is assumed that the wireless communication terminal 100 (1) connects to the Internet via LTE and downloads a file, and (2) connects to a printer using the WiFi tethering function to execute printout.

  Compare the time required for downloading in the above (1) and the time to send a file to the printer for printing out in (2), and from the buffer memory to give a longer buffer output period to the one where the processing is completed earlier The data transmission period may be lengthened.

  Alternatively, it is also possible to accept the setting of processing with a high priority in advance and set the period of data transmission from the buffer memory according to the priority. For example, when priority is given to printout processing, the period of data transmission by WiFi may be extended for the printout of (2) even during the download of (1).

<Modification>
As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above example.

(Trigger for starting buffer output control by the buffer control unit 16)
In the above embodiment, the buffer output control by the buffer control unit 16 is started when the wireless communication terminal 100 starts WiFi tethering (S305). However, the present invention is not limited to this, and it is also possible to always control the buffer output, or to control the buffer output of the LTE buffer 34 or the like when a new connection is made to the information communication device via WiFi.

(Communication method to control buffer output)
In the above embodiment, the buffer control unit 16 performs buffer output control when there is a possibility of data transmission simultaneously using LTE and WiFi. The combination of communication methods is not limited to LTE and WiFi, and may be a combination of other communication methods.

  For example, even in the case of a combination of CDMA and LTE, a buffer for data transmission by CDMA is provided, and data transmission from the buffer is periodically stopped so that data transmission by each communication method is not performed simultaneously as described above. Thus, power consumption can be reduced.

  As described above, the embodiments of the present invention have been described. According to the present invention, control is performed so that data is output from one of the buffer memories corresponding to each communication method, and data is not output simultaneously from a plurality of buffer memories. That is, the wireless communication unit corresponding to each communication method does not operate simultaneously during data transmission, and can control the power required for communication.

  The embodiment disclosed this time must be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be used for a wireless communication terminal in a mobile communication system or the like.

  DESCRIPTION OF SYMBOLS 1 Mobile communication system, 6 Display part, 7 Voice output part, 8 Voice input part, 9 Operation part, 10 Baseband part, 13 Storage part, 16 Buffer control part, 21 CDMA radio | wireless communication part, 31 LTE radio | wireless communication part, 41 WiFi wireless communication unit, 22 CDMA antenna, 32 LTE antenna, 42 WiFi antenna, 23 CDMA processing unit, 33 LTE processing unit, 43 WiFi processing unit, 34 LTE buffer, 44 WiFi buffer, 25 RF_IC for voice, 35 For data communication RF_IC, 45 WiFi RF_IC, 100 wireless communication terminal, 200 CDMA base station, 300 LTE base station, 201, 301, 401 communication path, 400 wireless communication device group, 411 game hardware, 412 mobile PC, 413 mobile game machine.

Claims (10)

A wireless communication terminal that supports multiple communication methods,
A first buffer memory for accumulating transmission data according to the first communication method and outputting the data;
A second buffer memory for accumulating transmission data by the second communication method and outputting the data;
A wireless communication unit that amplifies the signal for the data output and sends it as a wireless signal;
A buffer controller for stopping data output from the other buffer memory while one of the first and second buffer memories is outputting data;
A wireless communication terminal. The buffer control unit periodically switches a buffer memory that outputs data among the first and second buffer memories.
The wireless communication terminal according to claim 1. The buffer control unit performs the switching by setting a data output period applied to the buffer memory corresponding to a low-speed one of the plurality of communication methods to be longer than a data output period of a buffer memory corresponding to a high-speed communication method. Do,
The wireless communication terminal according to claim 2. The buffer control unit is configured to output a data output period of each of the first and second buffer memories so that a data transmission amount of each communication method is equal within a predetermined time according to an effective speed of wireless communication of each of the communication methods. To make the switch,
The wireless communication terminal according to claim 2. The wireless communication terminal has a tethering function that functions as a mobile router of the information communication device by connecting to one or more other information communication devices by any of the communication methods.
The buffer control unit performs the switching by setting a data output period of each of the first and second buffer memories according to at least one of the type or number of information communication devices to be connected.
The wireless communication terminal according to claim 2. The communication method includes wireless communication according to the IEEE 802.11 standard, and the wireless communication terminal is connected to a plurality of other information communication devices according to the communication method of the IEEE 802.11 standard as a mobile router of the information communication device. Is functional,
The wireless communication terminal according to claim 5. The buffer control unit performs the switching by setting a data output period of each of the first and second buffer memories according to a history of traffic of each communication method.
The wireless communication terminal according to claim 2. The buffer control unit performs the switching by setting a data output period of each of the first and second buffer memories according to the data accumulation amount of each of the first and second buffer memories.
The wireless communication terminal according to claim 2. The communication method includes wireless communication according to the IEEE 802.11 standard, and the wireless communication terminal is connected to a plurality of other information communication devices by a communication method according to the IEEE 802.11 standard and functions as a mobile router of the information communication device. Is what
The buffer control unit, when starting the operation as the mobile router, limits the buffer output to stop data output from the other buffer memory when one of the first and second buffer memories is outputting data. Start processing,
The wireless communication terminal according to claim 1. A first buffer memory corresponding to a plurality of communication schemes, which accumulates transmission data according to the first communication scheme and outputs the data, and a second buffer memory which accumulates transmission data according to the second communication scheme and outputs the data And a communication control method in a wireless communication terminal comprising a wireless communication unit that amplifies a signal related to the data output and transmits it as a wireless signal,
A buffer control step of stopping data output from the other buffer memory while any one of the first and second buffer memories is outputting data;
Communication control method.

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