JP2010268085A - Wireless access mode selection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform communication, by switching between a wide area wireless access system and a narrow area wireless access system, or by using both systems together. <P>SOLUTION: A transmitting/receiving circuit section 56 of a mobile terminal 100 includes a wide-area wireless access section 56a and a short-range wireless access section 56b and imparts a wide-area wireless communication mode of using the wide-area wireless access section 56a for connection via the communication line of the wide-area wireless access system and a short-range wireless communication mode of using the short-range wireless access section 56b for connecting mobile terminals to each other or connect the mobile terminal and an access point via a communication line of the short-range wireless access system, without passing the communication line of the wide-area wireless access system and performs selective switching to a single wireless communication mode or connects two wireless communication modes with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is applied to a wireless communication system using a portable terminal, and relates to a wireless access mode selection method for performing communication by switching a communication line to a wide-area wireless access system line or a narrow-area wireless access system line when walking or in-vehicle. .

  In recent years, with the advancement of mobile terminal functions, for example, a camera function capable of shooting high-quality images or movie images, and sending images shot using such camera functions to other mobile terminals by e-mail Mobile terminals equipped with the function to do so have become widespread. In addition, an image distribution service has been introduced that allows data on congestion on major roads and sightseeing spots to be distributed to in-vehicle mobile terminals, and images based on these distribution data can be displayed live on the display screen of mobile terminals. Yes.

  For this reason, in wireless communication using a portable terminal, it is desired that the system can stably communicate not only voice call data but also a large amount of data such as image data.

  By the way, various communication methods have been proposed in the present situation. In general, in a wide area wireless access system, although the communication speed is reduced but the access range is wide, it is difficult to increase the speed of data communication. The connection status is stable. However, if a lot of mobile terminals send and receive large amounts of data via the wide area wireless access system during the same time period, it will take time to send and receive data due to pressure on communication traffic. There is a possibility that the access time with the system becomes long.

  In addition, in a narrow area wireless access system, high-speed communication is possible, but the connection state may become unstable while moving. For example, when many mobile devices send and receive large amounts of data via a narrow-area wireless access system in the same time zone, it takes less time to send and receive data, but it sends and receives data while moving When performing this, there is a risk that access to the system will be interrupted along the way.

  Thus, conventionally, it has been proposed to perform wireless communication by switching an existing communication system.

  For example, conventionally, a method of setting a communication method according to a communication environment of a terminal by giving a plurality of communication methods to the terminal has been disclosed. For example, a technique has been proposed in which a Bluetooth function is added to a mobile phone so that information is shared between the in-vehicle device and the mobile phone (Patent Document 1).

  In addition, a technology has been proposed in which a communication mode is switched based on a detected moving speed using a wireless communication device mounted on a mobile device and capable of communicating in a plurality of communication modes such as an infrastructure mode and an ad hoc mode. (Patent Document 2).

  Also, when connecting to a network such as the Internet from a mobile terminal mounted on a vehicle such as an automobile, the priority in the environment of a communication medium such as a wireless LAN or PHS data communication is set, and the speed of the vehicle or a few seconds later A technology has been proposed in which it is possible to select the optimum communication medium by judging whether or not the communication medium can be switched based on the position of the vehicle, the communicable area of the communication medium, the communication medium corresponding to the speed, the communication state of the communication medium, and the like. (Patent Document 3).

  In addition, a technology for giving a P2P function to a mobile phone, determining whether the connection is made by a wide area communication or a connection by P2P communication when the destination mobile phone is in the vicinity or not, and connecting based on a route table Has been proposed (Patent Document 3).

JP 2008-278388 A JP 2008-193272 A JP 2005-223722 A

  However, the technology of Patent Document 1 communicates with each other between an in-vehicle device mounted on a vehicle and a portable information terminal owned by a user of the vehicle, and between any in-vehicle device and a mobile phone terminal. Does not have a function to enable communication.

  The technique of Patent Document 2 is a method of switching access points between an infrastructure mode and an ad hoc mode, and does not have a direct communication function between mobile phones.

  Moreover, the technique of patent document 3 can communicate only in the mode of either wide area communication or P2P communication between the portable terminals which exist in a short distance.

  The present invention has been made in view of such problems, and it is intended to efficiently perform communication by switching between a wide area wireless access method and a narrow area wireless access method, or by using both methods together. It is an object of the present invention to provide a realized radio access mode selection method.

  According to the first aspect of the present invention, there is provided a wide area wireless communication mode in which a mobile terminal is connected to a mobile terminal via a wide area wireless access system communication line, and between mobile terminals without using a wide area wireless access system communication line. A narrow-band wireless communication mode for connecting a portable terminal and an access point with a narrow-band wireless access system communication line is given, and one of the wireless communication modes is selectively switched, or two wireless communication modes are switched It is characterized by being connected to each other.

  According to a second aspect of the present invention, the wide area wireless communication mode performs frequency division duplex wireless communication according to the third generation mobile phone standard or WiMAX standard, and the narrow area wireless communication mode corresponds to time division according to the WAVE standard. A portable terminal that performs duplex wireless communication, has a WAVE function for wireless communication by connecting to a WAVE standard communication line, and a function for performing wireless communication by connecting to a third-generation mobile phone standard or WiMAX standard communication line When the mobile terminal is located in an access point with a communication line of the WAVE standard and when a P2P connection is possible between the mobile terminal of the communication destination and the communication terminal of the WAVE standard, It is characterized by enabling the WAVE function of the portable terminal.

  The invention according to claim 3 is characterized in that switching of the wireless communication mode is determined based on a P2P connection condition, a vehicle traveling speed, and a signal reception level from an access point with a communication line of the WAVE standard. .

  According to a fourth aspect of the present invention, an input / output unit in the wide area wireless communication mode and an input / output unit in the narrow area wireless communication mode are shared, and the input / output unit includes a display unit, an operation unit, a microphone, and a speaker. It is characterized by including.

  According to the first aspect of the present invention, a mode in which a mobile terminal is connected to a mobile terminal via a wide area wireless access system communication line, and between mobile terminals or a mobile terminal without using a wide area wireless access system communication line And a mode in which the access point is connected by a communication line of a narrow area wireless access method, and selectively switching one of the modes or connecting the two modes to each other, for example, in a road congestion situation Large-capacity information such as video download is communicated in a limited area using a narrow area wireless access method (for example, a radius of 100 m or less), so that radio waves of a wide area wide area wireless access method (for example, a radius of km) As a result, the communication efficiency using the frequency is not reduced, so that the frequency utilization efficiency can be improved as a whole. Further, by connecting and operating the two modes, communication connection can be made using the wide area wireless access system even outside the communication area using the narrow area wireless access system.

  According to the second aspect of the present invention, the third generation mobile phone system (hereinafter referred to as cellular) or WiMAX system FDD (frequency division duplex) function is used as the wide area wireless access system, and the ITS is used as the narrow area wireless access system. The IEEE 802.11p standard narrow area wireless access method used in the field, the so-called WAVE TDD (Time Division Duplex) function is used. As a result, for example, when a mobile in-vehicle mobile terminal that is moving is located in a WAVE access point or when a WAVE P2P connection is possible, by enabling (activating) the WAVE function, In the case of P2P communication, low-cost communication based on a wireless LAN independent of wide area wireless access can be realized as an ITS mode.

  According to the invention described in claim 3, switching between the wide area wireless communication mode and the narrow area wireless communication mode is determined based on the P2P connection condition, the vehicle traveling speed, and the signal reception level from the WAVE access point. Thus, it is possible to easily and reliably switch between the wide area wireless access mode and the narrow area wireless access mode.

  According to the fourth aspect of the present invention, since the input / output unit includes the display unit, the operation unit, the microphone, and the speaker of the mobile terminal, there is no need to provide a display unit, an operation unit, a microphone, a speaker, and the like for each mode. The configuration of the mobile terminal can be simplified.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to perform communication more efficiently by switching both the wide area | region wireless access system and a narrow area | region wireless access system, or using both systems together.

It is explanatory drawing which shows the structural example of the radio | wireless communications system using the portable terminal to which the radio | wireless access mode selection method of this invention is applied. 3 is a block diagram showing a configuration of a control system of portable terminal 100. FIG. 3 is a block diagram illustrating a configuration example of a transmission / reception circuit unit of the mobile terminal 100. FIG. 2 is a diagram illustrating a configuration of a server 600. FIG. 6 is an explanatory diagram illustrating a configuration of data stored in a storage unit 670 of a server 600. FIG. It is a figure which shows the connection sequence in a radio | wireless communications system. 4 is a flowchart showing processing for determining a switching pattern of a switch 111. 3 is an explanatory diagram showing a switching pattern of a switch 111. FIG.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram showing a configuration example of a radio communication system to which a radio access mode selection method of the present invention is applied. In FIG. 1, a portable terminal 100 is a terminal having functions of both wide area wireless access and narrow area wireless access. The portable terminal 200 is a terminal having at least a narrow area wireless access function. As shown by R1 in the figure, the base station 300 performs wireless connection with a portable terminal having a wide area wireless access function through a wide area wireless access line. As a wide area wireless access line, for example, there is a system based on a communication standard such as a third generation mobile phone (3G cellular) or WiMAX. In the present embodiment, description will be made assuming that both the mobile terminal 100 and the mobile terminal 200 have functions of both wide area wireless access and narrow area wireless access.

  As shown by R3 in the figure, the access point 400 is a narrow-band wireless access line with the mobile terminal 200, for example, a wireless specification based on the standard IEEE802.11p used in the ITS field, a line of a standard called WAVE Connected with. In the following description, a wide area wireless access line is a line using a 3G cellular FDD (frequency division duplex) function (hereinafter referred to as a cellular line), and a narrowband wireless access line is a WAVE type TDD (hours). A line using the division duplex function (hereinafter referred to as a WAVE line) will be described as a representative example. In the following description, a communication mode using a cellular line is referred to as a cellular mode, and a communication mode using a WAVE line is referred to as a WAVE mode.

  The mobile terminal 100 and the mobile terminal 200 each have a WAVE P2P connection function, and P2P communication between the mobile terminal 100 and the mobile terminal 200 is possible as indicated by R2 in the figure. In the following description, a communication mode using a cellular line is referred to as a cellular mode, a communication mode using a WAVE line is referred to as a WAVE mode, and a communication mode using a PAVE connection function of WAVE is referred to as a P2P mode.

  As shown by R4, R5, and R6 in the figure, the Internet network 500 connects the base station 300, the access point 400, and the server 600 through IP lines. The server 600 analyzes the outgoing information from the mobile terminal 100 received via the Internet network 500, converts the protocol and address, and then transmits the incoming information to the mobile terminal 200 via the Internet network 500 and the access point 400. .

FIG. 2 is a block diagram illustrating a configuration of a control system of the mobile terminal 100.
The portable terminal 100 includes a control unit 50, an operation unit 52, a memory 54, a transmission / reception circuit unit 56, an audio processing unit 58, an image processing unit 60, a speaker 62, a microphone 64, and a liquid crystal display unit 68. It has.

The control unit 50 controls the entire mobile terminal 100 and executes various functions.
The operation unit 52 includes function setting operation keys, input operation keys, and determination operation keys (not shown). When these keys (not shown) are pressed, an input signal corresponding to the key type is output to the control unit 50.
The memory 54 stores programs for causing the mobile terminal 100 to execute various functions and various data. The memory 54 stores, for example, a control program for sending and receiving calls and mails, an address book in which name and telephone number data are registered, and the like.

  The transmission / reception circuit unit 56 includes a wide area wireless access unit 56 a that performs wireless communication operation with the base station 300, a narrow area wireless access unit 56 b that transmits and receives data to and from the access point 400, and the BPF 102. The common antenna 101 is provided. That is, the transmission / reception circuit unit 56 performs wireless communication operations such as data reception and data transmission via the base station 300 or the access point 400.

  The audio processing unit 58 performs D / A conversion on audio data received via the shared antenna 101 and outputs audio from the speaker 62. In addition, the audio processing unit 58 performs A / D conversion on the audio signal input from the microphone 64 and outputs it to the transmission / reception circuit unit 56. The audio signal sent to the transmission / reception circuit unit 56 is encoded and modulated, and is transmitted to the base station 300 or the access point 400 via the shared antenna 101.

  The image processing unit 60 creates image data to be displayed on the liquid crystal display unit 68 based on an instruction from the control unit 50, and performs control to display an image on the liquid crystal display unit 68. For example, when a function setting operation key for designating an e-mail function is pressed on the operation unit 52, the control unit 50 sends an instruction to the image processing unit 60 so as to display an e-mail browser. An e-mail browser is displayed on the display unit 68.

  FIG. 3 is a block diagram illustrating a configuration example of the transmission / reception circuit unit of the mobile terminal 100. The portable terminal 100 transmits / receives radio waves to / from the base station 300 or the access point 400 via the shared antenna 101.

In FIG. 3, a BPF 102 separates the radio wave received by the shared antenna 101 into a radio wave on a cellular line and a radio wave on a WAVE line.
The wide area radio access unit 56a includes a transmission / reception BPF 103, an RF amplifier (RFAMP) 104, mixers (MIX) 105 and 115, a local oscillator (LO) 106, a modem unit 108, a codec decoding unit 109, an I / O interface 110, a low noise An amplifier (LNA) 114 is provided.
The narrow area wireless access unit 56b includes a T / R switch 120, an RF amplifier (RFAMP) 121, mixers (MIX) 122 and 127, a local oscillator (LO) 123, a modem unit 124, a codec decoding unit 125, An O interface 126 and a low noise amplifier (LNA) 128 are provided.

  The switch 111 includes a terminal of the I / O interface 110 on the input side, a terminal of the I / O interface 126 and a terminal of the I / O unit 112, a terminal of the I / O unit 112 on the output side, and a terminal on the input side And the output side terminal are electrically connected to switch the connection destination of the I / O unit 112 to either or both of the I / O interface 110 and the I / O interface 126. This switch switching is controlled by the control unit 50.

  Specifically, the control unit 50 determines the cellular line based on the signal level branched from the low noise amplifier (LNA) 114 of the cellular line and the signal level branched from the low noise amplifier (LNA) 128 of the WAVE line. It is determined whether the signal is a radio wave or a WAVE line radio wave, and a signal for instructing switching is output to the switch 111 based on the determination result.

  The I / O unit 112 corresponds to the microphone 64, the speaker 62, the operation unit 52, and the liquid crystal display unit 68. Accordingly, the I / O unit 112 such as the microphone 64, the speaker 62, the operation unit 52, and the liquid crystal display unit 68 can be shared for data input / output through the cellular line or the WAVE line.

Next, processing related to data reception will be described.
The radio wave received by the shared antenna 101 is separated by the BPF 102 into a cellular line radio wave and a WAVE line radio wave. When the radio wave separated by the BPF 102 is a radio wave on the cellular line, the radio wave on the cellular line is amplified by the low noise amplifier (LNA) 114 from the transmission / reception BPF 103 as the FDD mode, and then locally by the mixer (MIX) 115. The frequency is converted by the frequency of the transmitter (LO) 106. Thereafter, the signal is demodulated by the modem unit 108, decoded by the codec unit 109, and input to the I / O interface 110. On the other hand, when the radio wave separated by the BPF 102 is a radio wave of a WAVE line, the radio wave of the WAVE line is amplified by a low noise amplifier (LNA) 128 via a T / R switch 120 for transmission / reception separation as a TDD mode. After that, the frequency is converted by the mixer (MIX) 127 by the frequency of the local oscillator (LO) 123. Thereafter, the signal is demodulated by the modem unit 124, decoded by the codec decoding unit 125, and input to the I / O interface 126.

Next, processing related to data transmission will be described.
The voice data input via the microphone 64, the input data input via the operation unit 52, or the transmission data such as text data and image data stored in the memory 54 is controlled according to the switching control of the switch 11. , Output to the I / O interface 110 or the I / O interface 126. Here, when connected to the cellular line, the data is input to the I / O interface 110, encoded by the codec 109, modulated by the modem 108, and the frequency of the local oscillator (LO) 106. Only the frequency is converted, further amplified by an RF amplifier (RFAMP) 104, and wirelessly transmitted to the base station 300 via the transmission / reception BPF 103, the BPF 102 and the shared antenna 101.
On the other hand, when connected to the WAVE line, data is input to the I / O interface 126, encoded by the codec decoding unit 125, modulated by the modem unit 124, and only the frequency of the local oscillator (LO) 123. The frequency is converted, further amplified by an RF amplifier (RFAMP) 121, and wirelessly transmitted to the access point 400 via the T / R switch 120, the BPF 102, and the shared antenna 101.

  FIG. 4 shows a configuration example of the server 600. The server 600 stores a microprocessor 680 that functions as a signal reception unit 610, a transmission signal analysis unit 620, an incoming terminal determination unit 630, a protocol conversion unit 640, a format unit 650, and a sequence control unit 660, and various data. A storage unit 670 is provided.

The signal receiving unit 610 receives a transmission signal transmitted from the source mobile terminal via the Internet network 500.
The transmission signal analysis unit 620 analyzes the transmission signal and obtains the counterpart mobile terminal number.
The incoming terminal determination unit 630 refers to the mobile terminal number obtained by the outgoing signal analysis unit 620 and the data stored in the storage unit 670 to determine whether the destination mobile terminal is a terminal having a WAVE function or the access point 400. It is determined whether or not the user is in the area.
The protocol conversion unit 640 converts the received mobile terminal into a WAVE communication protocol when the destination terminal determination unit 630 determines that the partner mobile terminal is located in the area of the access point 400.
The format unit 650 converts the data format from the cellular format to the WAVE format when the receiving terminal determination unit 630 determines that the mobile terminal is within the area of the access point 400.
The sequence control unit 660 performs sequence control so that the processing by the signal reception unit 610, the outgoing signal analysis unit 620, the incoming terminal determination unit 630, the protocol conversion unit 640, and the format unit 650 is sequentially executed.
The storage unit 670 stores information on the data structure shown in FIG. That is, the storage unit 670 includes information indicating whether communication is possible using both the cellular line and WAVE methods for each portable terminal, or communication using only one of the methods, the position information of the portable terminal, and the portable terminal. Is stored associating information about whether or not is within the area of the access point of the WAVE line.

Next, an example of a connection sequence will be described with reference to FIG.
The mobile terminal 100 transmits a transmission signal including the mobile terminal number of the incoming call destination to the base station 300 (S101). When the base station 300 receives this transmission signal, the base station 300 relays the transmission signal to the server 600 (S102). When the server 600 receives the outgoing signal from the base station 300 (S103), the communication environment of the incoming terminal is determined by referring to the information in the storage unit 670 from the mobile terminal number of the destination of the outgoing signal (S104).

  It is determined that the destination mobile terminal 200 has a WAVE communication function (YES in S105) and P2P communication is possible based on the distance between the destination mobile terminal 200 and the destination mobile terminal 100. In this case (YES in S106), the cellular protocol is converted to the WAVE P2P protocol (S107), and a signal to the effect that P2P communication is possible is returned to the portable terminal 100 (S108). When the mobile terminal 100 receives a reply signal from the server 600 via the base station 300 (S109), the mobile terminal 100 sends the mobile terminal 200 in the P2P mode of WAVE. P2P mode wireless communication is performed (S110).

  When the destination terminal determination result indicates that the destination mobile terminal 200 has a WAVE communication function (YES in S105), but the destination mobile terminal 200 is not located in the P2P area ( It is determined whether the destination mobile terminal 200 is located in the area of the WAVE access point (S111). If present (YES in S111), the cellular protocol is converted to the WAVE protocol (S112), and the incoming signal is transmitted to the WAVE access point 400 (S113). The WAVE access point 400 receives a signal from the server 600 (S117), and calls the portable terminal 200, which is a receiving terminal, in the WAVE mode. Then, the mobile terminal 200 receives the incoming signal, so that the mobile terminal 100 and the mobile terminal 200 perform wireless communication in the WAVE mode (S118).

  If the destination mobile terminal 200 does not have a WAVE communication function (NO in S105), or the destination mobile terminal 200 is present in both the WAVE P2P area and the WAVE point area. If it is not within range (NO in S106, NO in S111), the incoming signal is transmitted to the base station 300 where the mobile terminal 200 is located with the cellular protocol (S114), and the incoming signal is received at the base station 300. After the relay (S115), the mobile terminal 200 that is the receiving terminal is called. Then, when the mobile terminal 200 receives the incoming signal, the mobile terminal 100 and the mobile terminal 200 perform wireless communication in the cellular mode (S116).

FIG. 7 is a diagram illustrating switching control of the switch 111 by the control unit 50. FIG. 8 is a diagram illustrating a specific example of a connection pattern of the switch 111.
The control unit 50 determines whether or not the communication mode is the WAVE P2P mode. If the control unit 50 determines that the communication mode is not the WAVE P2P connection mode (NO in S201), the control unit 50 determines whether or not the moving speed is equal to or higher than the specified value L. Is determined (S202). If it is the WAVE P2P connection mode (YES in S201), it is determined whether or not the call is via a cellular line (S205).

In addition, when it is not determined that the traveling speed is equal to or higher than the specified value L, the control unit 50 determines whether the level of the low noise amplifier (LNA) 114 is equal to or higher than the specified value M (S203).
If the control unit 50 does not determine that the level of the low noise amplifier (LNA) 114 is equal to or higher than the specified value M (NO in S203), the mobile terminal 200 is not in the in-vehicle environment and is located in the WAVE access point area. As shown in pattern A in FIG. 8A, the switch 111 is switched to the side connected to the cellular line to enable communication in the cellular mode (S204).
When control unit 50 determines that the communication mode is the P2P mode of WAVE and further determines that the call is not via a cellular line (NO in S205), or when it is determined that the traveling speed is equal to or higher than the specified value L Further, when it is determined that the level of the low noise amplifier (LNA) 114 is equal to or higher than the specified value M (YES in S203), the switch 111 is set on the WAVE side as shown in the pattern B in FIG. To enable communication in the WAVE mode (S206). For example, in the in-vehicle environment where the mobile terminal 200 is traveling, if the mobile terminal 200 is located within the WAVE access point, the connection of the pattern B in FIG. 8B is performed.

  In the case of a P2P connection and a call via a cellular line (YES in S201, YES in S205), the control unit 50 uses the cellular mode to extend the call via the cellular line of the mobile terminal 100 to the mobile terminal 200 using WAVE. -Connection of the pattern C in FIG. 6 (c) for continuously connecting the WAVE modes to each other is performed.

  According to this embodiment configured as described above, a mode in which the mobile terminal 100 is connected to the mobile terminal 100 via a wide area wireless access system communication line, A mode in which a mobile terminal and an access point are connected by a communication line of a narrow area wireless access method is given, and either one mode is selectively switched or two modes are connected to each other, for example, road congestion Large-capacity information such as situation video download is communicated in a limited area using a narrow area wireless access method (for example, a radius of 100 m or less). Thereby, since communication traffic performed using radio waves (for example, a radius of several kilometers) in a wide area wide area wireless access scheme is not compressed, the frequency utilization efficiency can be improved as a whole. Also, by connecting and operating the two modes, communication connection can be established using the wide area wireless access method even outside the narrow area access wireless area.

  Also, the third generation mobile phone system (hereinafter referred to as cellular) or WiMAX FDD (frequency division duplex) function is used as the wide area wireless access system, and the IEEE 802.11p standard used in the ITS field as the narrow area wireless access system. Using a narrow-band wireless access method, so-called WAVE TDD (Time Division Duplex) function, when a mobile terminal is mounted on the vehicle and is located at a WAVE access point or when a WAVE P2P connection is possible , Enable the WAVE function. This makes it possible to realize low-cost wireless LAN-based communication that is independent of wide area wireless access as an ITS mode when mounted on a vehicle or in the case of P2P communication. Note that P2P may be a connection between a car and a vehicle equipped with an in-vehicle portable terminal, or a communication between a car and a roadside device equipped with the in-vehicle portable terminal.

  Further, by providing a wide area wireless access function to the in-vehicle terminal having the narrow area wireless access function, the connection area of the in-vehicle terminal can be economically expanded and the convenience can be improved by using the existing infrastructure.

DESCRIPTION OF SYMBOLS 50 Control part 52 Operation part 54 Memory 56 Transmission / reception circuit part 56a Wide area wireless access part 56b Narrow area wireless access part 58 Audio | voice processing part 60 Image processing part 62 Speaker 64 Microphone 68 Liquid crystal display part 100 Portable terminal 101 Shared antenna 102 BPF
103 Send / Receive BPF
106, 123 Local transmitter 108, 124 Modulator / demodulator 109, 125 Codec decoder 110, 126 I / O interface 111 Switch 112 I / O unit 120 T / R switch 200 Mobile terminal 300 Base station 400 Access point 500 Internet network 600 Server 610 Signal receiving unit 620 Originating signal analyzing unit 630 Incoming terminal determining unit 640 Protocol converting unit 650 Format unit 660 Sequence control unit 670 Storage unit 680 Microprocessor

Claims (4)

  A wide area wireless communication mode that connects to a mobile terminal via a wide area wireless access system communication line, and between mobile terminals or between a mobile terminal and an access point without using a wide area wireless access system communication line. A narrow-band wireless communication mode for connecting with a narrow-band wireless access system communication line is given, and one of the wireless communication modes is selectively switched, or the two wireless communication modes are connected to each other. Wireless access mode selection method. The wide-area wireless communication mode performs frequency division duplex wireless communication in the third generation mobile phone standard or WiMAX standard,
The narrow-area wireless communication mode performs time division duplex wireless communication in the WAVE standard,
A mobile terminal having a WAVE function for performing wireless communication by connecting to a WAVE standard communication line and a function for performing wireless communication by connecting to a third generation mobile phone standard or WiMAX standard communication line is moving, and the mobile The WAVE function of the mobile terminal is enabled when the terminal is located in an access point with a WAVE standard communication line and when a P2P connection is possible with a communication destination mobile terminal via the WAVE standard communication line. The radio access mode selection method according to claim 1.   3. The wireless access according to claim 1, wherein the switching of the wireless communication mode is determined based on a P2P connection condition, a vehicle traveling speed, and a signal reception level from an access point with a communication line of the WAVE standard. Mode selection method. The input / output unit in the wide area wireless communication mode and the input / output unit in the narrow area wireless communication mode are common,
4. The wireless access mode selection method according to claim 1, wherein the input / output unit includes a display unit, an operation unit, a microphone, and a speaker.

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