JP2015076798A - Radio communication device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for efficiently using a frequency band used for radio communication while avoiding interference for a radio communication device which is adapted to a plurality of radio communication systems and performs radio communication with a plurality of frequency bands.SOLUTION: A radio communication device includes a transmission/reception part adaptively to a plurality of communication systems, which independently perform radio communication. When a frequency band used by a first communication system such as PHS is close to a frequency band used by a second communication system such as 3G/LTE, the second communication system may interfere with communication of the first communication system. The radio communication device determines whether the second communication system uses the frequency band which may interfere with communication of the first communication system when termination by the first communication system is detected, and searches for another usable band if the second communication system uses the frequency band which may interfere with the communication of the first communication system. When the second communication system can use the searched band, the radio communication device makes a transition to the band and performs termination processing of the first communication system.

Description

  The present invention relates to a wireless communication apparatus that performs wireless communication using a plurality of communication methods, and more particularly to a technique for switching a frequency band used for communication.

  In recent years, wireless communication devices such as smartphones and tablet terminals are capable of wireless communication corresponding to a plurality of communication methods. For example, a wireless communication apparatus includes a plurality of communication methods such as PHS (Personal Handy-phone System), W-CDMA (Wideband Code Division Multiple Access), FDD-LTE (Frequency Division Duplex Long Term Evolution), TD-LTE (Time Wireless communication is performed with other communication devices corresponding to various communication methods such as Division Duplex Long Term Evolution), wireless LAN (Local Area Network) standard, positioning by GPS (Global Positioning System), and data broadcasting.

  Further, the wireless communication device switches the frequency band used for communication in each communication method. For example, the wireless communication apparatus uses the 1900 MHz band during communication using the PHS method. In addition, for example, the wireless communication apparatus performs communication using a predetermined band such as an 800 MHz band, a 900 MHz band, a 1500 MHz band, and a 2100 MHz band during communication using the W-CDMA method.

  In this way, the wireless communication apparatus supports a plurality of communication methods and performs communication independently by each communication method. However, when the frequency band used for communication in each communication method is close, there is a possibility that the communication of one communication method may interfere with the communication of another communication method. Therefore, for example, Japanese Unexamined Patent Application Publication No. 2009-60250 (Patent Document 1) describes a technique that can avoid the occurrence of interference between wireless devices even when a plurality of wireless devices are operated simultaneously in a mobile communication terminal. ing. According to Patent Document 1, “the operation detection unit 13 transmits the information on the frequency band in use notified from the mobile communication function unit 16 a to the interference determination unit 15 together with the type of the wireless application that has generated the activation request event. “When the priority setting unit 14 receives information on the type of the wireless application currently operating from the operation detection unit 13, the priority setting unit 14 refers to a lookup table prepared in advance and operates the current wireless application. Is used as a key to set a frequency band assignment desired list in which frequency bands are arranged in an order in which interference does not occur easily (paragraphs 0027 and 0028 of Patent Document 1).

JP 2009-60250 A

  According to the technique described in Patent Document 1, the frequency band used for communication is switched every time an activation request is made. However, when the wireless communication apparatus is compatible with the first communication method and the second communication method, and the first communication method continues to be activated in a standby state due to intermittent reception or the like, the technique of Patent Document 1 is used. Then, the second communication method cannot use a frequency band close to the frequency band used for the communication of the first communication method. For example, it is assumed that the wireless communication apparatus supports the PHS system as the first communication system and the 3G (third generation mobile communication system) or LTE system as the second communication system. When the wireless communication device uses a band of 1900 MHz band for communication by the PHS system and is in a standby state, according to the technique of Patent Document 1, the wireless communication apparatus is a band close to the 1900 MHz band in communication by the 3G / LTE system. 1 frequency band (1920 MHz-1980 MHz, 2110 MHz-2170 MHz) cannot be used.

  Accordingly, the present invention provides a technique for efficiently using a frequency band used for wireless communication while avoiding interference in a wireless communication apparatus that supports a plurality of communication systems and performs wireless communication using a plurality of frequency bands. For the purpose.

  A communication device according to an embodiment includes: a first transmission / reception unit for transmitting / receiving a signal using a first communication method; a second transmission / reception unit for transmitting / receiving a signal using a second communication method; A control unit that controls wireless communication, and the control unit is configured to control the second communication method based on information on a frequency band used for communication of the second communication method during communication according to the first communication method. A determination unit that determines whether or not a frequency band used in communication is a frequency band that can interfere with communication according to the first communication method, and a determination unit that is used in communication in the second communication method When it is determined that the frequency band is a frequency band that can interfere with communication according to the first communication method, a process for shifting the frequency band used in the second communication method to a frequency band without interference is performed. And a communication processing unit to perform.

  According to another embodiment, a program for controlling the operation of a wireless communication device is provided. The wireless communication device includes a processor and a memory, and transmits and receives signals using the first and second communication methods. The program causes the processor to determine the frequency band used for communication of the second communication method based on the information of the frequency band used for communication of the second communication method during communication using the first communication method. The step of determining whether or not the frequency band that can interfere with communication according to the first communication method is determined, and the frequency band used in communication according to the second communication method is determined by the determination unit to be communicated according to the first communication method. When it is determined that the frequency band is capable of interfering with the frequency band, a step of performing processing for shifting the frequency band used in the second communication method to a frequency band without interference is executed.

  According to the one embodiment, the wireless communication apparatus can efficiently use the frequency band used for wireless communication while avoiding interference of each communication method.

  The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings.

1 is a diagram showing a configuration of a mobile communication system including a wireless communication device 100. FIG. 1 is a block diagram showing a configuration of a wireless communication device 100. FIG. It is a figure which shows each communication system and a frequency band. It is a figure which shows use band information 151. FIG. It is a figure which shows the detail of the frequency band of the communication of a PHS system. 10 is a flowchart illustrating processing for performing wireless communication by each communication method by switching the frequency band used by each communication method by the wireless communication device 100.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<Overview of network configuration>
FIG. 1 is a diagram showing a configuration of a mobile communication system including a wireless communication apparatus 100. The wireless communication device 100 is a wireless device such as a smartphone and wirelessly communicates with a wireless base station corresponding to a mobile communication system. The wireless communication device 100 supports, for example, PHS, W-CDMA, LTE, GSM (registered trademark) (global system for mobile communications) and other communication methods. The PHS base station 500 is a radio base station that supports the PHS scheme. The radio base station 600 is a radio base station compatible with the W-CDMA system. The radio base station 700 is a radio base station compatible with the TD-LTE scheme.

  Referring to FIG. 1, radio communication apparatus 100 performs radio communication with PHS base station 500 using a PHS scheme using a frequency band (for example, 1900 MHz band) that can be used in the PHS scheme. In addition, the wireless communication apparatus 100 includes frequency bands (for example, Band 1 (1920 MHz-1980 MHz, 2110 MHz-2170 MHz band), Band 8 (900 MHz-915 MHz, 945 MHz-958 MHz band), Band 11 (1427.9 MHz- 1462.9 MHz, 1475.9 MHz-1510.9 MHz band) and the like, and wireless communication with the wireless base station 600 by the W-CDMA system. Further, the radio communication apparatus 100 performs radio communication with the radio base station 700 by the TD-LTE scheme using a frequency band (for example, Band 41 (2545 MHz-2575 MHz band) that can be used by the TD-LTE scheme.

  The wireless communication apparatus 100 includes a plurality of transmission / reception units for transmitting / receiving wireless signals, and each wireless communication unit performs wireless communication independently. For example, the wireless communication apparatus 100 includes a first transceiver that corresponds to the PHS scheme, and a second transceiver that corresponds to W-CDMA or LTE.

  Although not shown, the wireless communication apparatus 100 corresponds to a wireless LAN standard such as IEEE (Institute of Electrical and Electronic Engineers) 802.11 and performs wireless communication with a wireless LAN access point.

<Device configuration>
FIG. 2 is a block diagram illustrating a configuration of the wireless communication apparatus 100. As shown in FIG. 2, the wireless communication device 100 includes a plurality of antennas (antenna 101, antenna 102), transmission / reception units (first transmission / reception unit 111, second transmission / reception unit 112) corresponding to each antenna, and transmission / reception units. Communication control unit (first communication control unit 121, second communication control unit 122), touch panel 141, display 142, positioning sensor 143, power supply control unit 144, battery 145, and voice processing unit 146. A microphone 147, a speaker 148, a storage unit 150, and a control unit 160.

  The antenna 101 and the antenna 102 radiate a signal emitted from the wireless communication device 100 as a radio wave. The antenna 101 receives radio waves from the space and provides a received signal to the first transmission / reception unit 111. The antenna 102 receives radio waves from the space and provides a received signal to the second transmission / reception unit 112.

  The first transmission / reception unit 111 and the second transmission / reception unit 112 perform modulation / demodulation processing for transmitting / receiving a signal via the antenna 101 or the like so that the wireless communication apparatus 100 communicates with other wireless devices. The first transmission / reception unit 111 and the second transmission / reception unit 112 are communication modules including a tuner, an RSSI (Received Signal Strength Indicator) calculation circuit, a CRC (Cyclic Redundancy Check) calculation circuit, a high-frequency circuit, and the like. The wireless communication device 100 performs modulation / demodulation and frequency conversion of a wireless signal transmitted and received, and provides a received signal to the control unit 160. The first transmission / reception unit 111 performs modulation / demodulation and frequency conversion on a radio signal transmitted / received by the radio communication apparatus 100 through the antenna 101, and provides a received signal to the first communication control unit 121. The second transmission / reception unit 112 performs modulation / demodulation and frequency conversion of the radio signal transmitted / received by the radio communication apparatus 100 through the antenna 102, and provides the received signal to the second communication control unit 122.

  The 1st transmission / reception part 111 is a communication module corresponding to a 1st communication system. The 1st transmission / reception part 111 respond | corresponds to the communication by PHS as a 1st communication system, for example. The 2nd transmission / reception part 112 is a communication module corresponding to a 2nd communication system. The second transmission / reception unit 112 supports communication using, for example, LTE and a 3G mobile communication system (3G) communication system such as UMTS (Universal Mobile Telecommunications System) as the second communication system. When the wireless communication apparatus 100 supports a plurality of communication methods, an antenna and a communication module may be provided corresponding to these communication methods.

  The first communication control unit 121 sends a control signal to the first transmission / reception unit 111 and controls transmission / reception of the signal by the first transmission / reception unit 111. For example, the first communication control unit 121 selects a circuit to be used by the first transmission / reception unit 111 according to signal transmission / reception. Further, the second communication control unit 122 sends a control signal to the second transmission / reception unit 112 and controls transmission / reception of the signal by the second transmission / reception unit 112.

  The touch panel 141 receives user input operations. The touch panel 141 accepts a user's contact operation by using, for example, a capacitive type. The touch panel 141 outputs an input operation by the user to the control unit 160.

  The display 142 displays icons, background images, and the like on the menu screen, and displays still images, moving images, and the like according to application operations. The display 142 is realized by, for example, an LCD (Liquid Crystal Display) or an organic EL (electroluminescence) display.

  The positioning sensor 143 is a sensor for measuring the position of the wireless communication apparatus 100, and is a GPS (Global Positioning System) module, for example. The positioning sensor 143 measures the position of the wireless communication device 100 using a frequency band (for example, 1500 MHz band) that can be used for positioning by GPS.

  The power control unit 144 controls power supply to each circuit of the wireless communication device 100. The power control unit 144 is, for example, a power control IC (Integrated Circuit).

  The battery 145 is a supply source that supplies power for operating each circuit of the wireless communication apparatus 100. The electric power from the battery 145 is supplied to each circuit according to the control of the power supply control unit 144.

  The audio processing unit 146 performs modulation / demodulation of the audio signal. The audio processing unit 146 modulates the signal given from the microphone 147 and gives the modulated signal to the control unit 160. In addition, the audio processing unit 146 provides an audio signal to the speaker 148. The audio processing unit 146 is realized by a processor for audio processing, for example.

  The microphone 147 receives a voice input by the user and gives a voice signal corresponding to the voice input to the voice processing unit 146.

  The speaker 148 converts the sound signal given from the sound processing unit 146 into sound and outputs the sound to the outside of the wireless communication apparatus 100.

  The storage unit 150 is configured by a flash memory, for example, and stores data and programs used by the wireless communication device 100. In one aspect, the storage unit 150 stores use band information 151.

  The used band information 151 indicates a frequency band used by the wireless communication apparatus 100 for communication. The radio base station includes information indicating the frequency band used for communication by the radio base station in the control signal. The first communication control unit 121 and the second communication control unit 122 extract information on frequency bands supported by the radio base station based on a control signal from the radio base station, and store the extracted information. The control unit 160 acquires, from the first communication control unit 121 and the second communication control unit 122, information indicating the frequency band of each radio base station notified to the second communication control unit 122 by the control signal of the radio base station. Then, the acquired information is stored in the storage unit 150 as use band information 151.

  The control unit 160 controls the operation of the wireless communication apparatus 100 by reading and executing a control program stored in the storage unit 150. The control unit 160 is, for example, an application processor. The control unit 160 operates according to the program, thereby exhibiting the functions of the incoming call detection unit 161, the used band acquisition unit 162, the band determination unit 163, and the communication processing unit 164.

  The incoming call detection unit 161 detects an incoming call based on a control signal that the wireless communication apparatus 100 receives from a wireless base station corresponding to each communication method.

  The used band acquisition unit 162 acquires the frequency band used for communication in each communication method from the control signal based on the control signal received by the wireless communication apparatus 100 from the wireless base station. For example, the control unit 160 acquires information indicating the frequency band of the radio base station from the second communication control unit 122.

  The band determination unit 163 is used in the second communication method when the wireless communication device 100 performs wireless communication using the first communication method and the second communication method. It is determined whether the frequency band that is present is a frequency band that can interfere with communication according to the first communication method. The frequency band that can be used for communication by the wireless communication apparatus 100 will be described in detail. FIG. 3 is a diagram illustrating each communication method and a frequency band. As illustrated in FIG. 3, the wireless communication device 100 performs wireless communication by PHS using, for example, a 1900 MHz frequency band as the first communication method. Moreover, the radio | wireless communication apparatus 100 performs radio | wireless communication by W-CDMA and TD-LTE, for example using Band41 as a 2nd communication system. As shown in FIG. 3, since the band used in the PHS scheme and the band used in Band1 are close, in the wireless communication of the wireless communication apparatus 100, communication using Band1 interferes with communication using the PHS scheme. obtain. When the first communication method is the PHS method, the band determination unit 163 determines whether or not the second communication method uses Band1 (1920 MHz-1980 MHz, 2110 MHz-2170 MHz band).

  The communication processing unit 164 uses the frequency band used in the second communication method when the frequency band used in the communication in the second communication method is a frequency band that can interfere with communication in the first communication method. The communication processing of the wireless communication apparatus 100 is controlled such as shifting to another frequency band.

<Data structure>
With reference to FIG. 4, data used in processing of the wireless communication device 100 will be described. FIG. 4 is a diagram showing the used band information 151. The used band information 151 is a diagram showing a frequency band used by the wireless communication apparatus 100 for wireless communication in each communication method.

  As shown in FIG. 4, the used band information 151 stores the frequency band used for wireless communication for each communication method. In the example of FIG. 4, the number “1” indicates the frequency band used in the first communication method (communication using the 1900 MHz band by the PHS method), and the number “2” indicates the second communication method. The frequency band (communication using Band 1 by the W-CDMA system) used in FIG.

<Details of frequency band>
With reference to FIG. 5, the details of the frequency band of the communication method used by wireless communication apparatus 100 for communication will be described. FIG. 5 is a diagram showing details of a frequency band of PHS communication.

  As shown in FIG. 5, it is assumed that wireless communication using the PHS system is determined to use a frequency band of 1884.5 MHz to 1915.7 MHz. Here, when the wireless communication device 100 uses Band 1 and performs wireless communication using, for example, the W-CDMA system, the wireless communication apparatus 100 is close to the PHS system frequency band, and thus may interfere with PHS system communication.

  The wireless communication apparatus 100 may reduce the influence of communication using Band 1 from interfering with the PHS frequency band by using a filter with a large attenuation using FBAR (Film Bulk Acoustic Resonator) technology. it can. For example, the wireless communication apparatus 100 can remove the influence of interference due to communication using Band1 for a frequency band of about 1907.75 MHz or less by using a filter with a large attenuation.

  However, even if these filters are used, there is a case where interference to the PHS frequency band due to communication using Band1 cannot be removed. As shown in FIG. 5, the bands used in the PHS method include a band 51 and a control band 52 that are not subjected to radio communication interference by Band1. Further, in FIG. 5, the band 53 is close to Band1, and therefore can receive interference from wireless communication in Band1. Therefore, when there is an incoming call in the PHS wireless communication, the wireless communication device 100 searches for a frequency band (such as Band 8) that can be used in the communication method using Band 1 and searches for the PHS band. Switch the frequency band to avoid interference.

<Control structure>
With reference to FIG. 6, a control structure of radio communication apparatus 100 will be described. FIG. 6 is a flowchart showing a process of performing wireless communication by each communication method by switching the frequency band used by the wireless communication device 100 in each communication method. In the following description, it is assumed that the first communication method is the PHS method and the second communication method is 3G or LTE.

  In step S101, the control unit 160 performs wireless communication using the first or second communication method and is in a standby state for incoming calls.

  In step S103, the control unit 160 detects an incoming call in the first communication method (PHS method) based on the control signal received from the PHS base station 500.

  In step S105, the control unit 160 acquires a frequency band used for communication in the second communication method (3G or LTE).

  In step S <b> 107, the control unit 160 determines that the frequency band used for communication in the second communication method such as standby or connection is a frequency band that can interfere with communication of the first communication method (PHS). It is determined whether or not there is. In the present embodiment, the control unit 160 determines whether the second communication method is performing wireless communication using the Band1 frequency band based on the information acquired in step S105. If the second communication method uses Band1 in step S107 (YES in step S107), control unit 160 performs the process in step S109, and otherwise performs the process in step S113.

  In step S109, the control unit 160 performs a search for whether or not a radio wave is received from another radio base station in the second communication method. As a result of the search, control unit 160 determines whether there is another band that can be used for wireless communication within the communication range of wireless communication apparatus 100. In step S109, if there is another band to be used for communication in the second communication method, the process of step S111 is performed, and if not, the process of step S113 is performed.

  In step S111, the control unit 160 performs a process of shifting the frequency band to a usable band in the second communication method.

  In step S113, the control unit 160 performs incoming call processing in the first communication method, and performs notification processing (such as notification of a ring tone from a speaker) for notifying the user of an incoming call.

<Summary>
According to the wireless communication apparatus of this embodiment, it is possible to avoid interference with PHS communication due to a communication method using Band1. Further, communication using Band1 can be performed except during communication by PHS, and the frequency band used for wireless communication can be efficiently used while avoiding interference of each communication method. Since Band 1 is a frequency band widely used in mobile communication systems, wireless communication such as 3G or LTE can be performed by Band 1 even while the PHS is waiting.

  The wireless communication apparatus of the present invention is realized by a processor and a program executed on the processor. The program for realizing the present invention is provided by transmission / reception using a network via a communication interface.

  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.

  DESCRIPTION OF SYMBOLS 100 Wireless communication apparatus, 101 Antenna, 102 Antenna, 111 1st transmission / reception part, 112 2nd transmission / reception part, 121 1st communication control part, 122 2nd communication control part, 141 Touch panel, 142 Display, 143 Positioning sensor, 144 Power supply control Unit, 145 battery, 146 sound processing unit, 147 microphone, 148 speaker, 150 storage unit, 151 used band information, 160 control unit, 161 incoming call detection unit, 162 used band acquisition unit, 163 channel switching unit, 164 communication processing unit, 500 PHS base station, 600 radio base station, 700 radio base station.

Claims (5)

A wireless communication device,
A first transmission / reception unit for transmitting / receiving a signal by the first communication method;
A second transmission / reception unit for transmitting / receiving a signal by the second communication method;
A control unit for controlling wireless communication of the wireless communication device,
The controller is
At the time of communication by the first communication method, the frequency band used for communication of the second communication method is based on the information on the frequency band used for communication of the second communication method. A determination unit that determines whether or not the frequency band may interfere with communication according to the communication method;
When the determination unit determines that the frequency band used in the communication of the second communication method is a frequency band that can interfere with the communication of the first communication method, the second communication method And a communication processing unit that performs processing for shifting the frequency band used in the above to a frequency band without interference. The first communication method is a communication method corresponding to PHS (Personal Handy-phone System),
The second communication method is a communication method corresponding to at least one of 3G (third generation mobile communication system) or LTE (Long Term Evolution),
The determination by the determination unit includes determining whether a frequency band used for 3G or LTE communication is a frequency band that can interfere with PHS communication during PHS communication,
The processing for shifting the frequency band used in the second communication method to the frequency band without interference by the communication processing unit changes the frequency band used for 3G or LTE communication to another frequency band. The wireless communication apparatus according to claim 1, comprising a transition. The control unit includes an acquisition unit that acquires a frequency band used for communication in the second communication method based on a control signal received from a radio base station corresponding to the second communication method,
The acquisition unit acquires a frequency band used for communication of the second communication method at the time of an incoming call by the first communication method,
The determination by the determination unit is based on the frequency band of the second communication method based on the frequency band of the second communication method acquired by the acquisition unit when an incoming call is received by the first communication method. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus determines whether or not a band is a frequency band that can interfere with communication according to the first communication method.   The wireless communication apparatus performs wireless communication with another apparatus using a frequency band of a control channel of the first communication method as a band that is not subject to interference due to communication of the second communication method. The wireless communication device according to claim 1. A program for controlling the operation of a wireless communication device,
The wireless communication device includes a processor and a memory, and transmits and receives signals using the first and second communication methods.
The program is stored in the processor.
At the time of communication by the first communication method, the frequency band used for communication of the second communication method is based on the information on the frequency band used for communication of the second communication method. Determining whether the frequency band can interfere with communication according to the communication method;
When the determination unit determines that the frequency band used in the communication of the second communication method is a frequency band that can interfere with the communication of the first communication method, the second communication method And a step of performing a process for shifting the frequency band used in the above to a frequency band without interference.

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