WO2006112255A1

WO2006112255A1 - Wireless communication terminal device and transmission system switching method

Info

Publication number: WO2006112255A1
Application number: PCT/JP2006/306915
Authority: WO
Inventors: Kenji Takahashi; Takashi Enoki
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2005-04-14
Filing date: 2006-03-31
Publication date: 2006-10-26
Also published as: JP2008166855A

Abstract

A wireless communication terminal device which reduces deterioration of wireless characteristics and performs high-speed communication by switching to a transmission system which uses an antenna element of the wireless communication terminal device and an antenna element of an external device directly mounted on the wireless communication terminal device when it is detected that the external device has the antenna element. In the wireless communication terminal device (100), whereupon the external device can be directly mounted, a detecting section (108) detects whether the mounted external device (160) has the antenna element or not. When it is detected that the external device (160) has the antenna element, a switching section (109) switches from the transmission system wherein only the antenna element (101) of the wireless communication terminal device (100) is used to the transmission system wherein the antenna element (101) and the antenna element (161) of the external device (160) are used.

Description

Specification

Wireless communication terminal apparatus and transmission method switching method

Technical field

TECHNICAL FIELD [0001] The present invention relates to a wireless communication terminal device that can be directly attached to an external device and a transmission method switching method for the wireless communication terminal device.

Background art

[0002] In recent years, multi-antenna transmission methods using multiple antennas, such as MIMO (Multi Input Multi Output) and AAA (Adaptive Array Antenna), have been studied to realize higher-speed data communication. Yes. MIMO is a transmission method that uses an array antenna for both transmission and reception, and enables high-speed communication by space division multiplexing and space-time coding. AAA also enables high-speed communication by suppressing interference waves by performing beamforming control and null steering control. Both transmission methods require a plurality of antenna elements (see Non-Patent Document 1, for example).

However, when a plurality of antenna elements are mounted on an information terminal device, the problem of mutual coupling between the antenna elements arises because the mounting space for the antenna elements is limited. Therefore, a configuration in which an antenna element is attached to the outside of an information terminal device is known (for example, see Patent Document 1).

FIG. 1 is a perspective view showing a connection state between a conventional external antenna and a mobile phone. The external antenna 1 is an array antenna in which a plurality of antennas are placed upright at the center and periphery of a disk-shaped pedestal. The external antenna 1 is connected to the mobile phone 3 by a coaxial cable 2. Communication quality is maintained by controlling the directivity of the external antenna 1 by using the external antenna 1 as a variable directivity antenna and performing beam forming control and null steering control.

[0005] In addition to whip antennas and inverted F-shaped antennas that are generally used in mobile phones, configurations in which antenna elements are provided in battery packs and chargers of mobile phones are also known (for example, Patent Document 2). And Patent Document 3).

FIG. 2 is a perspective view of a conventional battery pack built-in antenna. Unbalanced supply to battery pack 20 The electric antenna 21 and the antenna ground wire 22 are provided, and the radiation current of the antenna 21 is passed through the antenna ground wire 21 to the ground of the battery pack 20. With this configuration, it is possible to reduce the antenna radiation gain when the portable telephone case is held in the hand.

FIG. 3 is a configuration diagram showing an outline of a conventional charger with an antenna. The charger 30 includes a mobile phone fixing part 31 for fixing the mobile phone 40, a power connector 32 for charging the battery of the mobile phone 40, and an antenna connector 34 for connecting an external antenna 33. Then, the charger 30 becomes a charger with an antenna by connecting the external antenna 33 via the antenna connector 34. The cellular phone 40 has a switch 42 that switches the built-in antenna element 41 to the external antenna 33. The external antenna 33 is installed on the roof of a building or near a window, and is coupled to an antenna connector 34 connected by a cable 35. The combination notification unit 36 notifies the combination detection unit 43 of a combination signal when the mobile phone 40 is fixed to the charger 30 and is being charged. By this notification, the switch 42 is controlled, and the connection with the radio circuit 44 is switched from the built-in antenna element 41 to the external antenna 33.

With this configuration, even when the mobile phone 40 is fixed to the charger 30, switching the antenna to be operated from the built-in antenna element 41 to the external antenna 33 enables steady wireless communication.

Patent Document 1: Japanese Patent Laid-Open No. 2002-280942 (Page 6, Fig. 1)

Patent Document 2: JP 2000-13119 (2nd page, Fig. 3)

Patent Document 3: Japanese Unexamined Patent Publication No. 2001-168982 (Page 3, Figure 1)

Non-Patent Document 1: Nakajima, “New Generation Wireless Technology” Maruzen, March 25, 2004, Chapter 3, Chapter 4, P. 70-187

Disclosure of the invention

Problems to be solved by the invention

However, in a mobile phone configured to attach a conventional antenna element to the outside of the mobile phone, the RF transceiver circuit and the external antenna are connected via a coaxial cable. The signal passing loss is large. Therefore, there is a problem that radio characteristics such as distortion characteristics of the RF transmission circuit and noise figure characteristics of the RF reception circuit are deteriorated. [0010] In addition, when the external antenna element is attached to the battery pack as shown in FIG. 2, or when it is attached to the charger as shown in FIG. Both mobile phones perform single antenna transmission using either the built-in antenna or an external antenna, and are therefore suitable for high-speed communications that send and receive large amounts of data. ,,,.

An object of the present invention is to provide a wireless communication terminal apparatus capable of reducing deterioration of wireless characteristics and performing high-speed communication when performing communication using an external antenna.

Means for solving the problem

[0012] The wireless communication terminal device of the present invention is a wireless communication terminal device to which an external device can be directly attached, the detection means for detecting whether or not the attached external device has an antenna element, Switching means for switching from a transmission method using only the antenna element of the wireless communication terminal device to a transmission method using the antenna element and the antenna element of the external device when it is detected that the external device has an antenna element. The structure to be adopted is adopted.

The invention's effect

[0013] According to the present invention, when the detection means detects that the external device has an antenna element, the switching means is connected to the antenna element of the wireless communication terminal device and the external device directly attached to the wireless communication terminal device. By switching to a transmission system that uses this antenna element, it is possible to reduce deterioration of radio characteristics and perform high-speed communication.

Brief Description of Drawings

FIG. 1 is a perspective view of a conventional external antenna and a mobile phone.

[Figure 2] Perspective view of a conventional battery pack built-in antenna

[Fig.3] Configuration of conventional charger with antenna

FIG. 4 is a perspective view of the mobile phone according to Embodiment 1 of the present invention.

FIG. 5 is a block diagram showing an example of the configuration of the mobile phone and the battery pack according to Embodiment 1 of the present invention.

FIG. 6 is a perspective view of a folding type mobile phone according to the first embodiment of the present invention. FIG. 7 is a perspective view of a mobile phone according to Embodiment 2 of the present invention.

FIG. 8 is a block diagram showing an example of the configuration of a mobile phone and a charger according to Embodiment 2 of the present invention.

FIG. 9 is a perspective view of a mobile phone according to Embodiment 3 of the present invention.

FIG. 10 is a block diagram showing an example of the configuration of a mobile phone and a battery pack according to Embodiment 3 of the present invention.

FIG. 11 is a perspective view of a folding type mobile phone according to the third embodiment of the present invention.

FIG. 12 is a perspective view of a mobile phone according to Embodiment 4 of the present invention.

FIG. 13 is a block diagram showing an example of the configuration of the mobile phone and the charger in the fourth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0016] (Embodiment 1)

FIG. 4 is a perspective view of mobile phone 100 that is an example of the wireless communication terminal device according to the first embodiment of the present invention. This mobile phone 100 is equipped with a removable external device. In this embodiment, a battery pack is used as a specific example of the external device.

FIG. 4 shows a state where the radio base station 200 and the mobile phone 100 perform low speed communication and high speed communication. Specifically, as shown in FIG. 4A, when a normal battery pack 150 is attached to the mobile phone 100, the mobile phone 100 determines that the battery pack 150 does not have an antenna element, Communication with radio base station apparatus 200 (hereinafter referred to as a base station) is assumed to be single antenna transmission. In other words, the mobile phone 100 performs communication using only the antenna element 101 provided in advance in the mobile phone 100. In this case, the mobile phone 100 and the base station 200 are in a state of performing low-speed communication.

On the other hand, as shown in FIG. 4B, when battery pack 160 is attached to mobile phone 100, mobile phone 100 determines that this battery pack 160 has antenna element 161, and wireless Switch communication with base station device 200 to multi-antenna transmission using antenna element 161 of battery pack 160. That is, the mobile phone 100 has the antenna element 161. Multi-antenna transmission by detecting that the built-in battery pack 160 is installed and switching to the communication mode using the antenna element 161 of the battery pack 160 with built-in antenna in addition to the antenna element 101 provided in the mobile phone 100 in advance. Is realized. In this case, as compared with FIG. 4A, the mobile phone 100 and the base station 200 are in a state of performing high-speed communication.

FIG. 5 is a block diagram showing an example of the configuration of the mobile phone 100 and the battery pack directly attached to the mobile phone 100 in the present embodiment.

[0020] First, the configuration of the mobile phone 100 will be described.

A cellular phone 100 shown in FIG. 5 includes an antenna element 101, an RF (radio frequency) processing unit 102 that up-converts and down-converts a signal, and a BB (baseband) signal processing unit 103 that performs digital modulation / demodulation. A control unit 105 that controls the operation of the mobile phone 101, a power source unit 106, and an electrode 107.

The antenna element 101 receives a radio signal transmitted from the base station 200 and outputs it to the RF processing unit 102. Further, antenna element 101 transmits a signal subjected to predetermined radio processing by RF processing section 102 to base station 200.

The RF processing unit 102 performs predetermined radio processing such as down-conversion on the received signal input from the antenna element 101, converts the frequency to a radio band power baseband signal, and outputs the signal to the BB signal processing unit 103. Output. The RF processing unit 102 also performs predetermined radio processing such as up-conversion on the modulated signal input from the BB signal processing unit 103, converts the frequency into a baseband band power radio band signal, and outputs the signal to the antenna element 101. To do.

[0024] The BB signal processing unit 103 performs AZD (analog-digital) conversion processing, demodulation processing, and decoding processing on the signal subjected to radio processing by the RF processing unit 102, and acquires received data. Further, the BB signal processing unit 103 performs encoding processing, modulation processing, and DZA (digital analog) conversion processing on the transmission data, and outputs them to the RF processing unit 102. The specific configuration of the BB signal processing unit 103 will be described later.

[0025] The connector 104 is connected to a connector on the external device side such as a battery pack. When an external device is attached to the mobile phone 100, the connector 104 detects the attachment of the external device and outputs the detection result to the BB signal processing unit 103. The connector 104 has a BB signal The baseband signal from the processing unit 103 is output to the attached external device.

The control unit 105 controls each unit of the mobile phone 100 such as the BB signal processing unit 103 and the power supply unit 106. The power supply unit 106 outputs the power acquired through the electrode 107 to the control unit 105. The electrode 107 outputs power from the power supply of the external device to the power supply unit 106 by connecting to the external device such as a battery pack.

Next, the BB signal processing unit 103 will be specifically described.

The BB signal processing unit 103 includes a detection unit 108, a switching unit 109, a single antenna modulation / demodulation unit 110, and a multi-antenna modulation / demodulation unit 111.

The detection unit 108 detects whether or not the external device attached to the mobile phone 100 via the connector 104 has a antenna element, and outputs the detection result to the switching unit 109. Specifically, when the external device does not have an antenna element, the detection unit 108 instructs the switching unit 109 to switch to the single antenna transmission mode, that is, the transmission method using only the own antenna element. In addition, when the external device has an antenna element, the detection unit 108 instructs the switching unit 109 to switch to the multi-antenna transmission mode, that is, the transmission method using the antenna element of the own device and the antenna element of the external device. .

Switching section 109 switches the connection destination with RF processing section 102 to single antenna modulation / demodulation section 110 or multi-antenna modulation / demodulation section 111 according to the detection result from detection section 108. Specifically, switching section 109 switches the connection destination to single antenna modulation / demodulation section 110 if the detection result is a single antenna transmission mode, and switches the connection destination to multi antenna modulation / demodulation section 111 if the detection result is a multi-antenna transmission mode. Switch to.

[0031] Single antenna modulation / demodulation section 110 performs encoding processing on the transmission signal, modulates the signal after encoding to generate a modulation signal, performs DZA conversion on this modulation signal, and performs RF processing. The data is output to the processing unit 102. Also, the single antenna modulation / demodulation unit 110 performs AZD conversion on the received signal from the RF processing unit 102, performs demodulation processing on the digital signal to generate a demodulated signal, and performs decoding processing on the demodulated signal to receive the received data. get.

[0032] The multi-antenna modulation / demodulation unit 111 performs processing such as space-time coding and space-time decoding for MIMO transmission, for example. That is, the multi-antenna modulation / demodulation unit 111 performs space-time coding processing on the transmission signal, and performs modulation processing on the signal after space-time coding, thereby modulating the modulated signal. Is generated, and the modulated signal is DZA converted and output to the RF processing unit 102. The multi-antenna modulation / demodulation unit 111 performs AZD conversion on the received signal from the RF processing unit 102, performs demodulation processing on the digital signal, generates a demodulation signal, and performs space-time decoding processing on the demodulated signal. Get received data.

Next, the configuration of battery pack 150 and battery pack 160 that are detachably attached to mobile phone 100 having the above configuration will be described.

The battery pack 150 includes a battery 151 and an electrode 152. The battery 151 supplies power necessary for each unit of the mobile phone 100 to perform processing. The electrode 152 is connected to the electrode 107 on the mobile phone 100 side and supplies power from the battery 151 to the mobile phone 100.

On the other hand, battery pack 160 further includes antenna element 161, RF processing section 162, and connector 163 in addition to battery 151 and electrode 152.

The antenna element 161 receives a radio signal transmitted from the base station 200 and outputs it to the RF processing unit 162. Further, the antenna element 161 transmits a signal subjected to predetermined radio processing by the RF processing unit 162 to the base station 200.

The RF processing unit 162 performs predetermined radio processing such as down-conversion on the reception signal input from the antenna 161, converts the frequency to a radio band power baseband signal, and outputs the signal to the connector 163. Further, the RF processing unit 162 performs predetermined radio processing such as up-conversion on the baseband signal input from the mobile phone 100, converts the baseband signal into a radio band signal, and outputs the signal to the antenna element 161.

Connector 163 is connected to connector 104 on mobile phone 100 side. When battery pack 160 is attached to mobile phone 100, connector 163 outputs a baseband signal from RF processing unit 162 to connector 104. Connector 163 outputs a baseband signal input to mobile phone 100 to RF processing unit 162.

Next, the operation of mobile phone 100 when a battery pack is attached will be described.

As shown in FIG. 5A, when a normal battery pack 150 including only the battery 151 is attached to the mobile phone 100, the detection unit 108 detects the baseband from the battery pack 150 via the connector 104. Since the signal cannot be detected, it is determined that the battery pack 150 has an antenna element! In this case, since the switching unit 109 does not switch the transmission method, the control unit 1 05 instructs the BB signal processing unit 103 to perform the digital modulation / demodulation processing in the single antenna transmission mode using only the antenna element 101 preliminarily provided in the mobile phone 100. The single antenna modulation / demodulation unit 110 of the BB signal processing unit 103 performs encoding processing and modulation processing during transmission, performs demodulation processing and decoding processing during reception, and the RF processing unit 102 performs predetermined radio processing. Communication is performed using only the antenna element 101 that is preferentially provided in the mobile phone 100.

In addition, the battery 151 of the battery pack 150 supplies power to the mobile phone 100 via the electrode 152. Then, the power supply unit 106 of the mobile phone 100 acquires power through the electrode 107. The power supply unit 106 supplies the acquired power to each unit via the control unit 105.

On the other hand, as shown in FIG. 5B, when battery pack 160 is attached to mobile phone 100, detection unit 108 can detect a baseband signal from battery pack 160 via connector 104. Therefore, it is determined that the battery pack 160 has the antenna element 161. The detection unit 108 controls the switching unit 109 to switch the transmission method to the multi-antenna transmission mode using the antenna element 101 of the own device and the antenna element 161 of the battery pack 160. Specifically, the received signal input from the external antenna element 161 of the battery pack 160 is subjected to predetermined radio processing by the RF unit 162 and converted into a baseband signal. This baseband signal is sent to the connector 163. Via the mobile phone 100. Then, the detection unit 108 of the mobile phone 100 receives the baseband signal from the battery pack 160 via the connector 104, thereby determining that the battery pack 160 has the antenna element 161, and the switching unit 109 is a single unit. Control to switch the transmission method from the antenna transmission mode to the multi-antenna transmission mode. The switching unit 109 then switches the transmission method power using only the antenna element 101 of the mobile phone 100 to the transmission method using the antenna element 101 of the mobile phone 100 and the antenna element 161 of the battery pack 160 according to the instruction from the detection unit 108. .

[0043] Further, the control unit 105 detects that the battery pack 160 is attached to the mobile phone 100 via the connector 104 and the BB signal processing unit 103, and multi-controls the BB signal processing unit 103. A command is issued to perform digital modulation / demodulation processing in the antenna transmission mode. Then, the mobile phone 100 includes the antenna element 101 and the battery pack that are preferentially provided in the mobile device 100. Communication is performed using the external antenna element 161 of the link 160.

Here, MIMO transmission will be described as an example of a multi-antenna transmission mode that mobile phone 100 switches when battery pack 160 having antenna element 161 is attached.

[0045] When the mobile phone 100 detects the attachment of the battery pack 160 having the antenna element 161 and switches from the cinder antenna transmission method to the multi-antenna transmission method, the multi-antenna modulation / demodulation unit 111 performs the MIMO transmission processing, Telephone 100 notifies base station 200 of control information indicating that preparation for MIMO transmission is complete.

[0046] In the case of downlink communication, base station 200 performs space-time code processing within it and performs MIMO transmission using a plurality of antenna elements. The mobile phone 100 uses the antenna element 101 provided in advance in the mobile phone 100 and the external antenna of the battery pack 160 attached to the transmission signal independently transmitted from the base station 200 using a plurality of antenna elements. Receive MIMO with element 161. A signal received by MIMO is subjected to matrix calculation in multi-antenna modulation / demodulation section 111 and separated into signals for each transmission antenna, and subjected to space-time decoding processing to be received data.

On the other hand, in the case of uplink communication, multi-antenna modulation / demodulation section 111 performs space-time code processing on transmission data, and externally attaches antenna element 101 and battery pack 160 that are preliminarily provided in mobile phone 100. Use antenna element 161 to transmit MIMO. Base station 200 separates a transmission signal transmitted by MIMO from mobile phone 100 into a signal for each antenna, and decodes data by space-time decoding.

Thus, according to the present embodiment, in wireless communication terminal device 100 in which an external device such as battery pack 160 can be directly attached, detection unit 108 has battery element 160 in which attached battery pack 160 has an antenna element. When it is detected that the battery node 160 directly attached to the wireless communication terminal device 100 has the antenna element 161, the switching unit 109 only detects the antenna element 101 of the wireless communication terminal device. The transmission method power using the antenna is also switched to the transmission method using the antenna element 101 and the antenna element 161 included in the battery pack 160. As a result, the wireless communication terminal device 100 can be easily installed by directly attaching the battery pack 160 including the high frequency circuit (RF processing unit 162) without using a coaxial cable or the like. It is possible to prevent deterioration of radio characteristics due to signal loss in the coaxial cable and to perform high-speed communication.

[0049] In addition, the wireless communication terminal device can realize high-speed communication without using the antenna element mounting space in the wireless communication terminal device by using the antenna element provided in the battery pack. .

[0050] In the present embodiment, the detection unit 108 of the wireless communication terminal device 100 detects whether or not the battery pack 160 attached to the wireless communication terminal device 100 has an antenna element. It may be detected whether or not the battery pack 160 is supplying power to the wireless communication terminal device 100. When the battery pack 160 has the antenna element 161 and supplies power, the switching unit 109 uses the antenna element from the transmission method using only the antenna element 101 of the wireless communication terminal apparatus 100. 101 and the battery pack 160 are switched to the transmission system using the antenna element 161. As a result, the wireless communication terminal apparatus 100 can perform communication while supplying power, and can perform high-speed communication without worrying about power consumption.

[0051] Note that the antenna element 161 of the battery pack 160 attached to the mobile phone 100 is preferably a planar antenna. In addition, when multiple antenna elements are built in the battery pack with built-in antenna 160, in order to avoid an increase in spatial correlation due to coupling between the antenna elements, the distance between the antenna elements should be at least half a wavelength apart. Is desirable. Thereby, the quality of MIMO transmission can be maintained.

[0052] The shape of the antenna element 161 may be any shape as long as it can be stored in the battery pack 160 other than the planar antenna. For example, when a linear antenna, a slot antenna, or the like is applied, the antenna element 161 can be protruded from the battery pack 160, so that a plurality of antenna elements can be easily arranged apart from each other.

[0053] When a plurality of antenna elements are built in battery pack 160, the interval between the antenna elements may be narrowed to such an extent that the plurality of antenna elements are inductively coupled. As a result, it is possible to avoid an increase in spatial correlation due to inductive coupling, and to obtain an effect that it is easy to secure a space for arranging a plurality of antenna elements.

In the present embodiment, battery pack 160 has external antenna element 161 and an RF treatment. The battery pack 160 may be configured to include some of the functions of the BB signal processing unit 103 of the mobile phone 100, such as a quadrature modulation / demodulation function, an AZD conversion function, and a DZA conversion function. Good. As a result, the interface between the mobile phone 100 and the battery pack 160 becomes a digital signal, and an effect that the interface specifications can be easily obtained is obtained. In addition, it is possible to reduce the power consumption of the mobile phone 100 and simplify the device configuration.

In this embodiment, as shown in FIG. 4B, the battery pack 160 with a built-in antenna has a size that can be accommodated in the casing of the mobile phone 100, but can be directly attached to the mobile phone 100. In the case of a battery pack, the battery pack size and mounting type are not limited thereto. For example, as shown in FIG. 6, the battery pack 310 may have a structure that can stand on its own, and may be mounted on a foldable mobile phone 300 to perform multi-antenna transmission. In Fig. 6, the parts other than the antenna position 311 are hatched for distinction. In this case, since the battery can be charged more, it is possible to communicate for a long time, and since the external antenna element 311 is not covered with a hand, the antenna radiation characteristics can be improved.

[0056] In the present embodiment, the MIMO transmission is used as an example of the multi-antenna transmission mode. However, for example, AAA transmission may be used. In this case, the multi-antenna conversion / modulation unit 111 performs beam-forming / null steering processing to obtain an effect of suppressing the interference wave. In this case, the antenna element 101 and the external antenna element 161 that are preferentially provided in the mobile phone 100 need to be close to each other to the extent that directivity control by AAA is possible (about half wavelength).

Furthermore, at the time of single antenna transmission, antenna switching diversity that operates antenna element 101 and external antenna element 161 that are preferentially provided in mobile phone 100 in accordance with the radio wave environment may be used. . In this case, it is possible to improve the communication quality even during single antenna transmission.

[0058] (Embodiment 2)

In the first embodiment, the case where the battery pack is attached to the mobile phone has been described as an example. In Embodiment 2 of the present invention, a case where a charger is attached to a mobile phone will be described as an example. Light up.

FIG. 7 is a perspective view of mobile phone 100 according to Embodiment 2 of the present invention. A charger 400 is detachably attached to the cellular phone 100.

As shown in FIG. 7, the charger 400 is provided with a plurality of external antenna elements 401 upright. Here, communication between base station 200 and mobile phone 100 is MIMO transmission. When the mobile phone 100 is fixed to the charger 400, the mobile phone 100 detects that the mobile phone 100 is attached to the charger 400, and in addition to the antenna element 101 provided in the mobile phone 100, MIMO transmission is realized by using the external antenna element 401 provided in the charger 400 attached to the telephone 100. The data communicated with the mobile phone 100 is used by the computer 550 or the like via the cable 500, for example. Note that the shape and quantity of the external antenna element 401 are not particularly limited as long as they can be attached to the charger 400. Also, in order to ensure the quality of MIMO transmission, it is desirable that the antenna elements be spaced apart by more than half a wavelength.

FIG. 8 is a block diagram showing an example of the configuration of mobile phone 100 and charger 400 directly attached to mobile phone 100 in the present embodiment. Note that the cellular phone device 100 in FIG. 8 has the same configuration as the cellular phone 100 in FIG.

As shown in FIG. 8, charger 400 is supplied from external antenna element 401, RF processing unit 402 that up-converts and down-converts the signal, connector 403, and commercial power source 420. A charge control circuit 4004 for charging the battery pack 430 by converting AC voltage to DC voltage and an electrode 405 are provided.

The antenna element 401 receives a radio signal transmitted from the base station 200 and outputs it to the RF processing unit 402. In addition, the antenna element 401 transmits a signal that has been subjected to predetermined radio processing by the RF processing unit 402 to the base station 200.

[0064] The RF processing unit 402 performs predetermined radio processing such as down-conversion on the received signal input from the antenna element 401, converts the frequency into a radio baseband signal, and converts the frequency into a mobile phone 100. Output. Also, the RF processing unit 402 performs predetermined radio processing such as up-conversion on the baseband signal input from the attached mobile phone 100 to convert it to a radio band signal, and outputs it to the antenna element 401. Connector 403 is connected to connector 104 on mobile phone 100 side. When charger 400 is attached to mobile phone 100, connector 403 outputs the baseband signal from RF processing unit 402 to connector 104. Connector 403 outputs a baseband signal input from mobile phone 100 to RF processing section 402.

Charge control circuit 404 converts AC voltage supplied from external commercial power supply 420 connected to charger 400 into DC voltage, and charges battery pack 430. The electrode 405 is connected to a connector on the battery pack 430 side, and outputs power from the charge control circuit 404 to the battery pack 430.

The battery pack 430 includes an electrode 431, a battery 432, and an electrode 433.

[0068] The electrode 431 is connected to the electrode 405 of the charger 400, and outputs the power supplied from the charger 400 to the battery 432. The battery 432 supplies power charged through the electrode 431 to the mobile phone 100. The electrode 433 is connected to the electrode 107 on the mobile phone 100 side and outputs power from the battery 432 to the mobile phone 100.

Next, the operation of mobile phone 100 when charger 400 is attached will be described.

[0070] When charger 400 is directly attached to mobile phone 100, detection unit 108 can detect a baseband signal from charger 400 via connector 104, so that charger 400 is an antenna. It is determined that the element 401 is included. Then, the detection unit 108 controls the switching unit 109 to switch the transmission method from the single antenna transmission mode to the multi-antenna transmission mode using the antenna element 101 of the own device and the antenna element 401 of the charger 400. Specifically, the received signal input from the external antenna element 401 of the charger 400 is subjected to predetermined radio processing by the RF processing unit 402 and converted into a baseband signal. Is output to the mobile phone 100. Then, the detection unit 108 of the mobile phone 100 receives the baseband signal from the charger 400 via the connector 104, thereby determining that the charger 400 has the antenna element 401, and the switching unit 109 has a single antenna. The transmission mode force is also controlled to switch the transmission method to the multi-antenna transmission mode. Then, according to the instruction from the detection unit 108, the switching unit 109 uses only the antenna element 401 of the mobile phone 100 and the transmission method using the antenna element 101 of the mobile phone 100 and the antenna element 401 of the charger 400. Cut into Replace.

[0071] Then, control unit 105 detects that charger 400 is attached to mobile phone 100 via connector 104 and BB signal processing unit 103, and transmits a multi-antenna to BB signal processing unit 103. Command to perform modulation / demodulation processing in mode. Then, the multi-antenna modulation / demodulation unit 111 performs digital modulation / demodulation processing corresponding to MIMO transmission, and uses the antenna element 101 provided in the mobile phone 100 and the external antenna element 401 provided in the charger 400. connect. Note that the operation of MIMO transmission as an example of the multi-antenna transmission mode is the same as that described in Embodiment 1 above, and thus detailed description thereof is omitted.

In addition, charging control circuit 404 converts AC power input from commercial power supply 420 outside charger 400 into DC power, and charges battery pack 430 through electrode 405. The battery 432 in the battery pack 430 is charged with electric power from the charger 400 via the electrode 431. The charged electric power is supplied to the mobile phone 100 through the electrode 433.

[0073] On the other hand, when a normal charger only for supplying power is directly attached to the mobile phone 100, the detection unit 108 is connected to the base unit of the charger power through the connector 104. Since it is not possible to detect the signal, it is determined that the attached charger has an antenna element. That is, in this case, the switching unit 109 does not switch the transmission method, and therefore performs communication in the single antenna transmission mode using only the antenna element 101 of the mobile phone 100. Since the operation of the mobile phone 100 in this case is the same as the operation of the mobile phone shown in the first embodiment, detailed description thereof is omitted.

Thus, according to the present embodiment, in wireless communication terminal device 100 in which an external device such as charger 400 can be attached, detection unit 108 determines whether or not attached charger 400 has an antenna element. When the charger 400 directly attached to the wireless communication terminal device 400 detects that it has the antenna element 401, the switching unit 109 uses only the antenna element 101 of the wireless communication terminal device 100. Therefore, the transmission system is switched to the transmission system using the antenna element 401 included in the antenna element 101 and the charger 400. As a result, the wireless communication terminal device 100 enables the direct attachment of the charger 400 having a high-frequency circuit (RF processing unit 402) without using a coaxial cable or the like. It is possible to prevent radio characteristics from being deteriorated due to the loss of signal passing through the cable and to perform high-speed communication.

[0075] In addition, wireless communication terminal device 100 uses antenna element 401 provided in charger 400 to achieve high-speed communication without occupying the antenna element mounting space in wireless communication terminal device 100. can do.

Further, in the present embodiment, detection unit 108 of wireless communication terminal apparatus 100 detects whether or not charger 400 attached to wireless communication terminal apparatus 100 has the antenna element 401, and You may make it detect whether the charger 400 is the force which is charging the radio | wireless communication terminal device 100 with electric power. When the charger 400 has the antenna element 40 1 and is charging power, the switching unit 109 uses the antenna element from the transmission method using only the antenna element 101 of the wireless communication terminal device 100. 101 and the transmission system using the antenna element 401 of the charger 400 are switched. As a result, wireless communication terminal apparatus 100 can communicate in a charged state, so that it is possible to prevent battery exhaustion associated with high-speed communication with a large amount of power consumption and perform long-time communication.

[0077] In the present embodiment, charger 400 includes external antenna element 401 and RF processing unit 402. However, a part of the functions of BB signal processing unit 103 of mobile phone 100, for example, The charger 400 may have a quadrature modulation / demodulation function, AZD shelving capability, DZA shelving capability, and the like. In this case, an interface between the mobile phone 100 and the charger 400 becomes a digital signal, and an effect that the interface specification can be easily obtained is obtained.

In this embodiment, MIMO transmission is exemplified as an example of the multi-antenna transmission mode. However, AAA transmission may be used. In this case, in addition to the effect of the first embodiment described above, charger 400 generally has a large antenna mounting space, so that a large number of antenna elements can be arranged. Therefore, by increasing the number of antenna elements, it is possible to increase the null point of directivity, and the effect of improving the performance of suppressing interference waves can be obtained.

[0079] Also, when transmitting a single antenna, antenna switching diversity may be used in which the antenna element 101 and the external antenna element 101 preferentially provided in the mobile phone 100 are operated according to the radio wave environment. . In this case, even during single antenna transmission, communication The effect that quality can be improved is obtained.

[0080] (Embodiment 3)

In Embodiments 1 and 2 above, the wireless communication terminal device detects the presence or absence of an antenna element of an attached external device, and when the external device has an antenna element, only the antenna element of its own device is used. Single antenna transmission system power We switched to the multi-antenna transmission system using the antenna element of this device and the antenna element of the external device. In Embodiment 3 of the present invention, the wireless communication terminal apparatus detects the presence or absence of an antenna element of an attached external device, and when the external apparatus has an antenna element, MIMO only uses the antenna element of its own apparatus. Transmission method power Switch to the MIMO transmission method that uses the antenna element of this device and the antenna element of the external device for communication. Hereinafter, a cellular phone according to Embodiment 3 of the present invention will be described with reference to the drawings.

FIG. 9 is a perspective view of mobile phone device 600 that is an example of the wireless communication terminal apparatus according to Embodiment 3 of the present invention. The mobile phone 600 is equipped with a battery pack which is an example of an external device that can be attached and detached.

FIG. 9 shows a state where mobile phone 600 having antenna element 601 and antenna element 602 performs MIMO transmission with base station 700. Specifically, as shown in FIG. 9A, when a normal battery pack 150 is directly attached to the mobile phone 600, the mobile phone 600 determines that the battery pack 150 does not have an antenna element, Communication is performed between the two antenna elements 601 and 602 provided in advance in the mobile phone 600 and the two antenna elements provided in the base station 700. That is, mobile phone 600 and base station 700 each perform so-called 2 × 2 MIMO transmission by using two antenna elements.

On the other hand, as shown in FIG. 9B, when battery pack 660 is directly attached to mobile phone 600, mobile phone 600 includes mobile phone 600 having antenna element 661 and antenna element 662. Therefore, communication with the base station 700 is performed in the transmission mode that uses only the antenna elements 6001 and 602 of its own device 600, that is, the 2 × 2 MIMO transmission method, and the antenna element 601 provided in the mobile phone 600 in advance. And switch to the transmission mode using the two antenna elements 661 and 662 of the battery pack 660. Ie The mobile phone 600 and the base station 700 each use four antenna elements, thereby performing 4 × 4 MIMO transmission and enabling higher-speed communication.

FIG. 10 is a block diagram showing an example of the configuration of mobile phone 600 and the battery pack directly attached to mobile phone 600 according to Embodiment 3 of the present invention. Note that, in the components of the cellular phone and the battery pack in FIG. 10, the same components as those in the cellular phone and the battery pack in FIG.

First, the configuration of mobile phone 600 will be described.

[0086] A mobile phone 600 includes two antenna elements 601 and 602, an RF unit 603 and 604 that up-converts and down-converts a signal, a BB signal processing unit 605 that performs digital modulation / demodulation, a connector 606, and a mobile phone A control unit 607 that controls the operation of 600, a power supply unit 106, and an electrode 107 are included.

[0087] Antenna element 601 and antenna element 602 each receive a radio signal transmitted independently for each antenna element of base station 700, and output it to RF processing section 603 and RF processing section 604. In addition, antenna element 601 and antenna element 602 transmit signals that have been subjected to predetermined radio processing by RF processing unit 603 and RF processing unit 604, to base station 700, respectively.

[0088] The RF processing unit 603 and the RF processing unit 604 perform predetermined radio processing such as down-conversion on the reception signals respectively input from the antenna element 601 and the antenna element 602, and thereby convert the radio band power into a baseband signal. The frequency is converted and output to the BB signal processing unit 605. Further, the RF processing unit 603 and the RF processing unit 604 perform predetermined radio processing such as up-conversion on the modulation signal input from the BB signal processing unit 605, and perform frequency conversion from a baseband band to a radio band signal to perform antenna conversion. Outputs to element 601 and antenna element 602, respectively.

[0089] The BB signal processing unit 605 performs processing such as space-time coding and space-time decoding for MIMO transmission. That is, the BB signal processing unit 605 performs AZD conversion processing, demodulation processing, and space-time decoding processing on the signals subjected to radio processing by the RF processing unit 603 and the RF processing unit 604, respectively. Receive data transmitted from the antenna element. In addition, the BB signal processing unit 605 performs DZA conversion processing on transmission data, The space-time coding process and the modulation process are performed, separated into signals to be transmitted from the respective antenna elements, and output to the RF processing unit 603 and the RF processing unit 604. The specific configuration of the BB signal processing unit 605 will be described later.

The connector 606 is connected to a connector on the external device side such as a battery pack. When an external device is attached to the mobile phone 600, the connector 606 detects the attachment of the external device and outputs the detection result to the BB signal processing unit 605. The connector 606 outputs the baseband signal from the BB signal processing unit 605 to the attached external device.

Control unit 607 controls each unit of mobile phone 600 such as BB signal processing unit 605 and power supply unit 106.

Next, the BB signal processing unit 605 will be specifically described.

The BB signal processing unit 605 includes a detection unit 608, a switching unit 609, a 2 × 2MIMO modulation / demodulation unit 610, and a 4 × 4MIMO modulation / demodulation unit 611.

Detection unit 608 detects whether or not an external device directly attached to mobile phone 600 via connector 606 has an antenna element, and outputs the detection result to switching unit 609. Specifically, when the external device does not have an antenna element, the detection unit 608 switches to a 2 X 2 MIMO transmission mode, that is, a 2 X 2 MIMO transmission method using only the antenna element of the own device. Direct to 609. In addition, when the external device has an antenna element, the detection unit 608 switches to 4 X 4 MIMO transmission mode, that is, to switch to the 4 X 4 MIMO transmission method using the antenna element of the own device and the antenna element of the external device. Direct to Part 609.

[0095] Switching unit 609 switches the connection destination of RF processing unit 603 and RF processing unit 604 to 2 X 2 MIMO modulation / demodulation unit 610 or 4 X 4 MIMO modulation / demodulation unit 611 according to the detection result from detection unit 608! . Specifically, the switching unit 609 switches the connection destination to the 2 X 2 MIMO modulation / demodulation unit 610 if the detection result is 2 X 2 MIMO transmission mode, and the connection destination to 4 X 4 MIMO if the detection result force X 4 MIMO transmission mode. Switch to modem 611.

[0096] 2 X 2 MIMO modulation / demodulation section 610 performs processing such as space-time coding and space-time decoding in order to perform 2 X 2 MIMO transmission using two antennas. That is, 2 X 2MIM O modulation / demodulation unit 610 performs space-time coding processing on transmission data, and performs space-time coding. The subsequent signal is modulated to generate a modulated signal. Then, the 2 × 2MIMO modulation / demodulation unit 610 performs DZA conversion on the modulated signal and outputs the result to the RF processing unit 603 and the RF processing unit 604, respectively. Further, 2 × 2MIMO modulation / demodulation section 610 performs AZD conversion on the received signals input from RF processing section 603 and RF processing section 604, converts them into digital signals, and separates them into signals for each antenna. Then, 2 × 2MIMO modulation / demodulation section 610 performs demodulation processing on the signal separated for each antenna to generate a demodulated signal, performs time-space decoding processing on this demodulated signal, and obtains received data.

[0097] In order to perform 4 X 4 MIMO transmission using four antennas, 4 X 4 MIMO modulation / demodulation section 611 performs processing such as space-time coding and space-time decoding. That is, 4 × 4MIM modulation / demodulation section 611 performs space-time coding processing on transmission data, and modulates the signal after space-time coding to generate a modulated signal. Then, 4 × 4 MIMO modulation / demodulation unit 6111 performs DZ A conversion on this modulated signal, and outputs the result to RF processing unit 603, RF processing unit 604, and RF processing unit of the external device. The 4 X 4 MIMO modulation / demodulation unit 611 performs AZD conversion on the received signals respectively input from the RF processing unit 603, the RF processing unit 604, and the RF processing unit of the external device, and converts them into digital signals. To separate. Then, 4 × 4 MIMO modulation / demodulation section 611 performs demodulation processing on the signal separated for each antenna to generate a demodulated signal, and performs space-time decoding processing on the demodulated signal to obtain received data.

Next, the configuration of battery pack 660 that is detachably attached to mobile phone 600 having the above configuration will be described.

Battery pack 660 includes antenna element 661, antenna element 662, RF processing unit 663, RF processing unit 664, = 3 years old, Kuta 665, battery 151, and electrode 152.

[0100] Antenna element 661 and antenna element 662 receive signals transmitted independently from base station 700, and output the signals to RF processing section 663 and RF processing section 664, respectively. In addition, antenna element 661 and antenna element 662 transmit signals that have been subjected to predetermined radio processing by RF processing section 663 and RF processing section 664, to base station 700, respectively.

[0101] The RF processing unit 663 and the RF processing unit 664 are the antenna element 661 and the antenna element 66. The received signals input from 2 are subjected to predetermined radio processing such as down-conversion, and the radio band power is also frequency-converted to a baseband signal and output to the connector 665. Also, the RF processing unit 663 and the RF processing unit 664 perform predetermined radio processing such as up-conversion on the baseband signal input from the mobile phone 600, and frequency-convert the baseband band to the radio band signal. Are output to antenna element 661 and antenna element 662, respectively.

[0102] Connector 665 is connected to connector 606 on mobile phone 600 side. When battery pack 660 is attached to mobile phone 600, connector 665 outputs the baseband signals from RF processing unit 663 and RF processing unit 664 to connector 606. The connector 665 outputs a baseband signal input from the mobile phone 600 to the RF processing unit 663 and the RF processing unit 664.

Next, the operation of mobile phone 600 when a battery pack is attached will be described.

As shown in FIG. 10A, when a normal battery pack 150 including only the battery 151 is directly attached to the mobile phone 600, the detection unit 608 is connected to the battery pack 150 via the connector 606. Since the baseband signal cannot be detected! /, It is determined that the battery pack 150 does not have an antenna element. In this case, since the switching unit 609 does not switch the transmission method, the control unit 607 has only the antenna element 601 and the antenna element 602 provided in the mobile phone 600 with respect to the BB signal processing unit 605. Commands to perform digital modulation / demodulation in the 2 X 2 MIMO transmission mode used. The 2 × 2 MIMO modulation / demodulation unit 610 of the BB signal processing unit 605 performs signal processing such as space-time code processing during MIMO transmission, and performs signal processing such as space-time decoding processing during MIMO reception, MIMO communication is performed using only the two antenna elements 601 and 602 provided in advance in the mobile phone 600.

On the other hand, as shown in FIG. 10B, when battery pack 660 is directly attached to mobile phone 600, detection unit 608 detects a baseband signal from battery pack 660 via connector 606. Therefore, it is determined that the battery pack 660 has an antenna element. Then, the detection unit 608 switches the antenna unit of the own device and the battery pack 660 from the 2 X 2 MIMO transmission mode in which the switching unit 609 uses only the antenna element of the own device as the transmission method. Control to switch to 4 X 4 MIMO transmission mode using antenna elements. Specifically, received signals input from the external antenna element 661 and antenna element 662 of the battery pack 660 are subjected to predetermined radio processing by the RF processing unit 663 and the RF processing unit 664, respectively, and converted into baseband signals. The baseband signal is output to mobile phone 600 via connector 665. Then, the detection unit 608 of the mobile phone 600 receives the baseband signal via the connector 606, thereby determining that the battery pack 660 has the antenna element 661 and the antenna element 662, and the switching unit 609 transmits 2 X 2 MIMO transmission. The mode controller is also controlled to switch the transmission method to 4 X 4 MIMO transmission mode. Then, in accordance with an instruction from detection unit 608, switching unit 609 uses antenna elements 601 and 602 of mobile phone 600 and uses 2 X 2 MIMO transmission system to change antenna elements 6 01 and 602 of mobile phone 600, and battery pack 660. The antenna element 661 and the antenna element 662 are switched to V, 4 X 4 MIMO transmission system.

Then, the control unit 607 detects that the battery pack 660 is attached to the mobile phone 600 via the connector 606 and the BB signal processing unit 605, and performs 4 X on the BB signal processing unit 605. Command to perform digital modulation / demodulation in 4 MIMO transmission modes. Then, mobile phone 600 performs MIMO communication using two antenna elements 601 and 602 provided in advance in own device 600 and two external antenna elements 661 and 662.

Specifically, first, mobile phone 600 notifies base station 700 of control information indicating that preparation for 4 × 4 MIMO transmission is complete.

[0108] In the case of downlink communication, base station apparatus 700 performs space-time code processing within the base station apparatus, and performs MIMO transmission of independent transmission signals using four antenna elements. The mobile phone 600 receives Ml MO signals transmitted from the base station by using two antenna elements 601 and 60 2 and two external antenna elements 661 and 662 that are provided on the mobile phone 600. . Then, 4 × 4 MIMO modulation / demodulation section 611 performs matrix operation on the received signal and separates it into a signal for each antenna, performs space-time decoding, and acquires received data

[0109] On the other hand, in the case of uplink communication, the mobile phone 600 uses the 4 X 4 MIMO modulation / demodulation unit 611.

Performs space-time code processing in the X4 MIMO transmission mode, and can be used for mobile phone 600. Two independent antenna elements 601 and 602 and two external antenna elements 661 and 662 are used for MIMO transmission. Base station 700 decodes data by space-time decoding in 4 × 4 MIMO transmission mode.

As described above, according to the present embodiment, in wireless communication terminal device 600 to which an external device such as battery pack 660 can be directly attached, detection unit 608 has an attached battery pack 660 as an antenna. When it is detected that the battery knock 660 directly attached to the wireless communication terminal device 600 has the antenna element 601 and the antenna element 602, the switching unit 609 From the 2 X 2 MIMO transmission system using only the antenna element 601 and the antenna element 6 02 to the 4 X 4 MIMO transmission system using the antenna elements 661 and 662 and the antenna elements 661 and 662 of the battery pack 660. Switch. As a result, the wireless communication terminal device 600 is not required to use a coaxial cable or the like, and the battery pack 660 having a high-frequency circuit (RF processing unit 663 and RF processing unit 664) can be directly mounted. In addition to preventing the deterioration of radio characteristics due to signal loss in the cable, higher-speed communication can be performed.

[0111] In addition, wireless communication terminal device 600 uses antenna element 661 and antenna element 662 provided in battery pack 660 to perform high-speed communication without allocating the antenna element mounting space in wireless communication terminal device 600. Can be realized.

Further, in the present embodiment, detection unit 608 of radio communication terminal apparatus 600 detects whether or not battery pack 660 attached to radio communication terminal apparatus 600 has a power of an antenna element, and It may be detected whether the battery pack 660 is capable of supplying power to the wireless communication terminal device 600. When the battery pack 660 has an antenna element and supplies power, the switching unit 609 uses only the antenna element 601 and the antenna element 602 of the wireless communication terminal device 600. The transmission system force is also switched to the 4 × 4 MIMO transmission system using the antenna elements 601 and 602 and the antenna elements 661 and 662 of the battery pack 660. As a result, the wireless communication terminal device 600 can communicate with the power supplied, so that the power consumption High-speed communication can be performed without worrying about.

[0113] Note that the antenna elements 661 and 662 of the battery pack 660 attached to the mobile phone 600 are preferably planar antennas. When multiple antenna elements are built in the battery pack with built-in antenna 660, the spacing between the antenna elements should be separated by at least a half wavelength or more to avoid an increase in spatial correlation due to coupling between the antenna elements. This is desirable. Thereby, the quality of MIMO transmission can be maintained.

[0114] Further, the antenna elements 661 and 662 may have any shape other than the planar antenna as long as it can be stored in the battery pack 660. For example, when a linear antenna slot antenna or the like is applied, the antenna element can be protruded from the battery pack 660, so that an effect of easily disposing a plurality of antenna elements can be obtained.

[0115] When a plurality of antenna elements are built in battery pack 660, the distance between the antenna elements may be narrowed to such an extent that the plurality of antenna elements are inductively coupled. As a result, it is possible to avoid an increase in spatial correlation due to inductive coupling, and to obtain an effect that it is easy to secure a space for arranging a plurality of antenna elements.

In the present embodiment, the battery pack 660 includes the external antenna elements 661 and 662, the RF unit 663, and the RF processing unit 664. The battery pack 660 may have a part of the functions, for example, a quadrature modulation / demodulation function, an AZD conversion function, a DZA conversion function, and the like. As a result, the interface between the mobile phone 600 and the battery pack 660 becomes a digital signal, and the effect that the interface specifications can be simplified is obtained. In addition, it is possible to reduce the power consumption of mobile phone 600 and to simplify the device configuration.

[0117] In the present embodiment, as shown in FIG. 9B, the battery pack 660 with a built-in antenna is sized to be accommodated in the case of the Ml MO mobile phone 600, but can be directly attached to the mobile phone 600. As long as it is a simple battery pack, the size and mounting type of the battery pack are not limited thereto. For example, as shown in FIG. 11, the battery pack 810 has a structure that can stand on its own, and is attached to a folding-type mobile phone 800, and the antenna element 801 and antenna element 802 of the mobile phone 800 are connected to the battery pack. 810 antenna elements 811 The antenna element 812 can be used for V, 4 x 4 MIMO transmission. In this case, since the battery can be charged more, communication is possible for a long time, and since the external antenna elements 811 and 812 are not covered with hands, the antenna radiation characteristics can be improved. can get.

[0118] Furthermore, in this embodiment, both downlink communication and uplink communication are 2 X.

2 MIMO transmission or 4 X 4 MIMO transmission, but the BB signal processing unit 605 has a function of switching the number of antennas during MIMO transmission, for example, downlink transmission power X 4 MIMO transmission, uplink communication As in 2 x 2 MIMO transmission, the number of antenna sets for MIMO transmission may differ between downlink and uplink communications. In this case, an unnecessary increase in communication capacity can be avoided, and the power consumption of the MIMO mobile phone and the base station can be reduced.

[Embodiment 4]

In the third embodiment, the case where the battery pack is attached to the mobile phone has been described as an example. In Embodiment 4 of the present invention, a case where a charger is attached to a mobile phone will be described as an example.

FIG. 12 is a perspective view of mobile phone 600 according to Embodiment 4 of the present invention. A charger 900 is detachably attached to the mobile phone 600.

As shown in FIG. 12, the charger 900 is provided with two external antenna elements 901 and antenna elements 902 standing upright. Here, communication between base station apparatus 700 and mobile phone 600 is assumed to be MIMO transmission. When the mobile phone 600 is fixed to the charger 900, the mobile phone 600 detects that the mobile phone 600 is connected to the charger 900, and the two antenna elements 601 and 602 provided in the mobile phone 600 are preliminarily provided. In addition, 4 × 4 MIMO transmission is realized by using the two external antenna elements 901 and 902 provided in the charger 900 attached to the mobile phone 600. The data communicated with the mobile phone 600 is used by the computer 1100 via the cable 1000, for example. The external antenna elements 901 and 902 may have any shape and quantity as long as they can be attached to the charger 900 without being particularly limited. Also, in order to ensure the quality of MIMO transmission, it is desirable that the antenna elements be spaced apart by more than half a wavelength. Yes.

FIG. 13 is a block diagram showing an example of the configuration of mobile phone 600 and charger 900 attached to mobile phone 600 according to Embodiment 4 of the present invention. Note that the mobile phone 600 in FIG. 13 has the same configuration as that of the mobile phone in FIG. Further, in the components of the charger and battery pack in FIG. 13, the same components as those in the charger and battery pack of FIG.

The charger 900 shown in FIG. 13 is supplied from a plurality of external antenna elements 901 and 902, an RF unit 903 and an RF unit 904 that up-convert and down-convert signals, a connector 905, and a commercial power source 420. A charging control circuit 404 for charging the battery 430 by converting the AC voltage to be converted into a DC voltage, and an electrode 405.

[0124] Antenna element 901 and antenna element 902 receive signals transmitted independently from base station 700, and output the signals to RF processing section 903 and RF processing section 904, respectively. In addition, antenna element 901 and antenna element 902 transmit signals that have been subjected to predetermined radio processing in RF processing section 903 and RF processing section 904, to base station 700, respectively.

[0125] The RF processing unit 903 and the RF processing unit 904 perform predetermined radio processing such as down-conversion on the reception signals input from the antenna element 901 and the antenna element 902, respectively, The frequency is converted and output to the connector 905. Also, the RF processing unit 903 and the RF processing unit 904 perform predetermined radio processing such as up-conversion on the baseband signal input from the mobile phone 600 and frequency-convert the baseband band to the radio band signal. Are output to the antenna element 901 and the antenna element 902, respectively.

Connector 905 is connected to connector 606 on mobile phone 600 side. When the charger 900 is attached to the mobile phone 600, the connector 905 outputs the baseband signal from the RF processing unit 903 and the RF processing unit 904 to the connector 606. Connector 905 outputs a baseband signal input from mobile phone 600 to RF processing section 903 and RF processing section 904.

Next, the operation of mobile phone 600 when charger 900 is attached will be described. [0128] When the charger 900 is directly attached to the mobile phone 600, the detection unit 608 can detect the baseband signal from the charger 900 via the connector 606. It is determined that the antenna element is included. Then, the detection unit 608 uses the antenna unit of the own device and the antenna element of the battery pack 660 from the 2 X 2 MIMO transmission mode in which the switching unit 609 uses only the antenna element of the own unit as a transmission method. 4 X 4 MIMO transmission mode Control to switch to. Specifically, the received signals input from the external antenna element 9001 and the antenna element 902 of the charger 900 are subjected to predetermined radio processing by the RF processing unit 903 and the RF processing unit 904, respectively, and converted into baseband signals. The converted baseband signal is output to the mobile phone 600 via the connector 905. Then, the detection unit 608 of the mobile phone 600 receives the baseband signal via the connector 606, thereby determining that the charger 900 has the antenna element 901 and the antenna element 902, and the switching unit 609 transmits 2 X 2 MIMO transmission. Control to switch the transmission method from the mode to the 4 X 4 MIMO transmission mode. Then, in accordance with the instruction from the detection unit 608, the switching unit 609 uses the antenna elements 601 and 602 of the mobile phone 600 from the 2 X 2 MIMO transmission method using only the antenna elements 601 and 602 of the mobile phone 600 and the charger 900. Switch to 4 X 4 MIMO transmission system using antenna element 90 1 and antenna element 902.

Then, the control unit 607 detects that the charger 900 is attached to the mobile phone 600 via the connector 606 and the BB signal processing unit 605, and 4 X 4 for the BB signal processing unit 605. Command to perform digital modulation and demodulation in MIMO transmission mode. Then, mobile phone device 600 performs MIMO communication using two antenna elements 601 and 602 provided in advance in own device 600 and two external antenna elements 901 and 902. Note that the specific operation of 4 × 4 MIMO transmission is the same as that described in Embodiments 1 and 2, and thus detailed description thereof is omitted.

[0130] On the other hand, when a normal charger intended only for charging is directly attached to the mobile phone 600, the detection unit 608 detects the baseband signal of the charger power via the connector 606. Since it is not possible, it is determined that the attached charger has an antenna element. That is, in this case, since the switching unit 609 does not switch the transmission method, the mobile phone 600 has two antenna elements of the base station 700 and two mobile phones 600 that are preliminarily provided. The antenna elements 601 and 602 perform 2 X 2 MIMO transmission. The operation of mobile phone device 600 in this case is the same as the operation of the mobile phone shown in the third embodiment, and a detailed description thereof will be omitted.

As described above, according to the present embodiment, in wireless communication terminal device 600 to which an external device such as charger 900 can be directly attached, detection unit 608 has attached charger 900 as an antenna element. When the charger 90 0 directly attached to the wireless communication terminal device 600 is detected to have the antenna element 901 and the antenna element 902, the switching unit 609 displays the wireless communication terminal device 600. 4 X 4 MIMO transmission system using this antenna element 601 and 602, and antenna element 901 and antenna element 902 of charger 900 from 2 X 2 MIMO transmission system using only 600 antenna elements 601 and 602 Switch to. As a result, the wireless communication terminal device 600 can be directly connected to the charger 900 having a high-frequency circuit (RF processing unit 903 and RF processing unit 904) without using a coaxial cable or the like. The wireless characteristics can be prevented from deteriorating due to signal loss in the cable, and higher-speed communication can be performed.

[0132] Further, wireless communication terminal apparatus 600 uses antenna element 901 and antenna element 902 provided in charger 900, so that high-speed communication can be achieved without occupying a space for mounting antenna elements in wireless communication terminal apparatus 600. Can be realized.

Further, in the present embodiment, detection unit 608 of radio communication terminal apparatus 600 detects whether charger 900 attached to radio communication terminal apparatus 600 has power or not, and the charging The device 900 may detect whether or not the wireless communication terminal device 600 is charged with power. When the charger 900 has an antenna element and is charging power, the switching unit 609 uses only the antenna element 601 and the antenna element 602 of the wireless communication terminal device 600 for 2 × 2 MIMO transmission. The system is switched to the 4 × 4 MIMO transmission system using the antenna elements 601 and 602 and the antenna element 901 and the antenna element 902 included in the charger 900. As a result, the wireless communication terminal device 600 can communicate power in a charged state, so that it can perform high-speed communication for a long time without worrying about power consumption, and MIMO communication with high power consumption. Can be prevented from running out of the battery. [0134] In the present embodiment, charger 900 includes external antenna elements 901 and 902 and RF processing units 903 and 904, but the function of BB signal processing unit 605 of mobile phone 600 is described. For example, the charger 900 may be configured to include a part of the charger 900, such as an orthogonal modulation / demodulation function, an AZD conversion function, and a DZA conversion function. In this case, the interface between the mobile phone 600 and the charger 900 is a digital signal, and the effect that the interface specifications can be easily obtained is obtained.

[0135] In addition, during normal 2 X 2 MIMO transmission, communication may be performed using one antenna element that is preferentially installed in mobile phone 600 and one external antenna element. . In this case, the antenna element spacing during MIMO transmission can be increased, so that the communication quality can be improved.

[0136] Based on Japanese Patent Application No. 2005-116871 filed on April 14, 2005.

All this content is included here.

Industrial applicability

[0137] When the present invention detects that an external device has an antenna element, the transmission method uses the antenna element of the wireless communication terminal device and the antenna element of the external device directly attached to the wireless communication terminal device. By switching to, high-speed communication can be performed, which is useful as a wireless communication terminal device that has the effect of being able to directly attach external devices.

Claims

The scope of the claims

[1] A wireless communication terminal device that can be directly attached to an external device,

Detecting means for detecting whether or not the mounted external device has an antenna element; and, when detecting that the external device has an antenna element, the antenna from the transmission method using only the antenna element of the wireless communication terminal device And a switching means for switching to a transmission method using an antenna element of the external device and the external device.

[2] The external device is a battery pack or a charger.

The switching means uses the antenna element of the radio communication terminal apparatus when the detection means detects that the external device supplies power to the radio communication terminal apparatus and has an antenna element. 2. The wireless communication terminal apparatus according to claim 1, wherein the transmission method using the antenna element and the antenna element of the battery pack is switched.

3. The wireless communication terminal apparatus according to claim 1, wherein the transmission method is MIMO transmission.

[4] An external device that can be directly attached to the wireless communication terminal device according to claim 1 and includes a high-frequency circuit.

[5] A transmission method switching method in a wireless communication terminal device to which an external device can be directly attached.

When the attached external device detects whether or not the external device has an antenna element, and detects that the external device has an antenna element, the antenna element and the antenna element from the transmission method using only the antenna element of the wireless communication terminal device A transmission method switching method for switching to a transmission method using an antenna element of the external device.