JP2010161469A - Wireless terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a wireless terminal which enable simultaneous communication using a plurality of communication systems and a plurality of frequency bands, to receive a signal having a sufficient S/N by one radio unit without being disturbed by transmission power from the other radio unit for transmission. <P>SOLUTION: In the case that data is transmitted by a radio unit A while data is received by a radio unit B, a control section 7 always monitors a reception rate of the radio unit B and controls a transmission rate in the radio unit A so as to maximize the reception rate, whereby transmission to and reception from two radio units can be simultaneously performed by one terminal and reception at the reception rate having a value most suitable for situations is possible. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless terminal, and more particularly to a wireless terminal that enables simultaneous communication using a plurality of communication methods or a plurality of frequency bands.

  There is known a wireless terminal that performs communication using both the communication method A and the wireless communication method B, which have different frequency bands. This radio terminal usually has a radio unit A corresponding to the radio communication method A, an antenna A corresponding to the radio unit A, a radio unit B corresponding to the radio communication method B, and a radio unit B. It is configured as a dual system wireless terminal having an antenna B corresponding to.

  This wireless terminal can simultaneously wait for both wireless communication systems. In addition, when the wireless terminal is in the area of the wireless communication system A, the wireless terminal transmits / receives a signal by the wireless unit A, and when it is in the area of the wireless communication system B, the wireless terminal transmits / receives a signal. I do.

  Further, when the wireless terminal is in an area where the wireless communication method A and the wireless communication method B are mixed, either one of the wireless communication methods is selected automatically or manually, and the selected wireless communication method is selected. Communicate with the base station.

  As described above, most conventional dual system wireless terminals use two wireless communication systems in one terminal by simply switching between the two systems in time. For this reason, it has been hardly considered that two systems transmit and receive at the same time.

  As a conventional technique related to the dual system wireless terminal as described above, for example, a technique described in Patent Document 1 is known.

JP 2007-215009 A

  However, recently, with the spread of streaming and the like, opportunities for downloading large-capacity data have increased, and there is a demand for faster data communication. Conventionally, an apparatus having two or more communication systems in which one terminal is different is known, but this terminal hardly has two or more different communication systems communicating at the same time.

  One reason is interference between systems. For example, when the antennas of the radio unit A and the radio unit B that use different frequency bands are installed close to each other, or when one antenna is shared, the radio unit A transmits. Think about going. In this case, the transmission power of the radio unit A becomes an interference wave in the reception band of the radio unit B, and the signal-to-noise ratio (hereinafter, S / N ratio) of the signal received by the radio unit B is deteriorated. . If the S / N ratio of the signal received by the radio unit B deteriorates, the reception rate of the signal received by the radio unit B will be lowered. Therefore, it takes time to receive data at the terminal, and the terminal is used. It becomes inconvenient for the user who does.

  An object of the present invention is to perform transmission in a wireless terminal that enables simultaneous communication using a plurality of communication schemes or a plurality of frequency bands in view of the problems of the conventional wireless terminal as described above. Providing a radio terminal capable of receiving a signal having a sufficient S / N ratio at the other radio unit at a high rate without being disturbed by transmission power from one radio unit. There is to do.

  According to the present invention, the object is that a radio terminal is composed of a radio unit A comprising a transmission / reception circuit unit A and a signal processing unit A, a radio unit B comprising a transmission / reception circuit unit B and a signal processing unit B, and a radio unit. A and a control unit for controlling the radio unit B. The radio unit A performs radio communication with the base station by the radio communication method A by the antenna A connected to the radio unit A. The radio unit B performs radio communication with the base station by the radio communication method B different from the radio communication method A by the antenna B connected to the radio unit B, and the control unit When one of the equipment is transmitting and the other is receiving, the reception rate of the wireless equipment that is receiving is monitored and the transmission rate of the wireless equipment that is transmitting is controlled By doing so, the receiving rate at the receiving radio unit is optimally controlled. It is achieved by Rukoto.

  Further, the object is to make a wireless terminal into a radio unit A composed of a transmission / reception circuit unit A and a signal processing unit A, a radio unit B composed of a transmission / reception circuit unit B and a signal processing unit B, a radio unit A and a radio Wireless communication between the wireless device A and the base station in the frequency band A of the wireless communication system 1 by the antenna A connected to the wireless device A. The radio unit B performs radio communication with the base station in the frequency band B different from the frequency band A of the radio communication method 1 by the antenna B connected to the radio unit B, and performs the control. The unit monitors the reception rate of the receiving radio unit when one of the radio units transmits and the other receives, and the radio unit of the transmitting unit By controlling the transmission rate, the radio unit that is receiving It is achieved by optimally controlling the signal rate.

  According to the present invention, in a wireless terminal that enables simultaneous communication using a plurality of communication schemes or a plurality of frequency bands, the wireless terminal is subject to interference due to transmission power from one radio unit that performs transmission. In other wireless units, signals having a sufficient S / N ratio can be received with high throughput. As a result, it is possible to perform transmission / reception in two or more wireless communication schemes or multiple frequency bands of the same wireless communication scheme at the same time on one terminal using an existing dual mode terminal, dual band terminal, multimode terminal or multiband terminal. It becomes easy and a high-speed communication environment can be obtained easily.

It is a block diagram which shows the structure of the radio | wireless terminal by one Embodiment of this invention. It is a figure explaining the influence on the radio equipment part B by the transmission power of the radio equipment part A when the radio equipment part A and the radio equipment part B use different frequency bands. It is a figure explaining the influence on the radio | wireless machine part B at the time of reducing the transmission power of the radio | wireless machine part A by control of this invention. It is a flowchart explaining the processing operation in embodiment of this invention by a control part. It is a figure explaining the example of the method of monitoring the transmission data rate of the radio | wireless part of a transmission side, and the reception data rate of the radio | wireless part of a reception side, and searching for an optimal transmission rate and an optimal reception rate. It is a figure explaining the other example of the method of monitoring the transmission data rate of the radio | wireless part of a transmission side, and the reception data rate of the radio | wireless part of a reception side, and searching for an optimal transmission rate and an optimal reception rate. It is a figure which shows the example of the radio | wireless terminal comprised in the card type. It is a figure which shows the other example of the radio | wireless terminal comprised in the card type. It is a figure which shows the example which comprised each of several radio | wireless machine parts (2 units in the example of illustration) contained in the radio | wireless terminal in the card type. It is a figure which shows the other example which comprised each of several radio | wireless machine parts (2 units in the example of illustration) contained in the radio | wireless terminal in the card | curd type.

  Hereinafter, embodiments of a wireless terminal according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a wireless terminal according to an embodiment of the present invention. The illustrated wireless terminal has a plurality of different radio units that perform transmission / reception by a plurality of different wireless communication methods and a plurality of antennas corresponding thereto or one shared antenna in one terminal, and control between them. This is a dual system wireless terminal in which the control unit performs the above. The plurality of radio units described above may perform transmission / reception using different frequency bands using the same radio communication system as well as those using different radio communication systems.

  A wireless terminal 8 according to an embodiment of the present invention is configured inside a mobile phone or the like and can be carried by a user. As shown in FIG. 1, data (including an audio signal) according to a wireless communication system A is included. Wireless unit A5a that transmits and receives (good), wireless unit B5b that transmits and receives data (including audio signals) by wireless communication system B, and wireless unit A5a and wireless unit B5b. Antennas 6a and 6b, and a control unit 7 that performs control between the radio unit A5a and the radio unit B5b.

  In the above description, the radio unit A5a and the radio unit B5b communicate with a radio base station (not shown) that performs communication using different radio communication methods or communication using different frequency bands using the same radio communication method. Is what you do. As a wireless communication method, a wireless communication method capable of controlling transmission power such as GSM, CDMA, TD-sCDMA, WiMAX, or the like can be used.

  The radio unit A5a includes a reception unit A1a that performs reception using the wireless communication method A, a transmission unit A2a that performs transmission using the wireless communication method A, and a transmission / reception circuit unit A3a connected to the antenna 6a, and a transmission / reception circuit unit A3a. And a signal processing unit A4a for processing the above signals. The radio unit B5b includes a receiving unit B1b that performs reception using the wireless communication method B, a transmitting unit B2b that performs transmission using the wireless communication method B, and a transmission / reception circuit unit B3b connected to the antenna 6b, and a transmission / reception circuit. A signal processing unit B4b for processing the signal of the unit B3b.

  The wireless terminal 8 according to the above-described embodiment of the present invention is configured to include two different radio units A5a and B5b that perform transmission and reception using two different wireless communication methods, and two antennas 6a and 6b corresponding thereto. As described above, the radio terminal 8 according to the present invention may be configured to include three or more radio units that perform transmission and reception using three or more different radio communication schemes. You may comprise so that an equipment part may share.

  When the wireless terminal 8 according to the embodiment of the present invention configured as described above is in a wireless communication area that is neither the wireless communication method A nor the wireless communication method B, the wireless device unit A5a and the wireless device 8 The machine unit B5b enters the standby reception mode, and each radio unit continues to check whether there is no area for the wireless communication system A and whether there is no area for the wireless communication system B.

  Further, when the wireless terminal 8 is in the area of the wireless communication system A, the wireless terminal 8 according to the embodiment of the present invention can transmit and receive data using the wireless device unit A5a. While the radio unit A5a is transmitting and receiving data, the radio unit B5b enters a standby reception mode to check whether there is no area for the wireless communication system B and continues reception for confirmation.

  Further, when the wireless terminal 8 is in the area of the wireless communication system B, the wireless terminal 8 according to the embodiment of the present invention can transmit and receive data using the wireless device unit B5b. While the radio unit B5b is transmitting and receiving data, the radio unit A5a enters the standby reception mode to confirm whether there is no area of the radio communication method A and continues reception for confirmation.

  Furthermore, when the wireless terminal 8 according to the embodiment of the present invention is in an area where both the wireless communication method A and the wireless communication method B coexist, the wireless terminal 8 performs wireless transmission by the wireless unit A5a in either transmission / reception. Whether to use the communication method A or the wireless communication method B by the wireless device part B5b can be selected automatically or manually, and the wireless device part A5a and the wireless device part B5b are connected to the wireless communication method A, Data can be sent and received simultaneously using B.

  Next, as an example of selecting a radio system, the radio unit A5a performs data transmission and the radio unit B5b simultaneously receives data, and the radio unit A5a and the radio unit B5b transmit and receive data simultaneously. In this case, one radio unit transmits data and the other radio unit receives data. Therefore, the radio unit A5a transmits data and the radio unit B5b receives data. As the control performed at the same time, the basic concept of the present invention will be described first for the control in the embodiment of the present invention.

  In the embodiment of the present invention, in the case as described above, the radio unit B5b receives a signal having a sufficient S / N ratio without being disturbed by the transmission power from the radio unit A5a that performs transmission. In order to be able to perform the operation, that is, in order not to lower the reception rate of the signal received by the radio unit B5b, it is necessary to reduce the transmission spurious of the radio unit A5a in the reception band of the radio unit B5b. There is.

  In general, a radio base station performs an integration process on a received signal in order to demodulate received signal data. For this reason, the power per bit required for reception is constant depending on the system. Therefore, when the rate of data transmitted from the wireless terminal 8 is increased, the transmission power from the terminal is increased, and when the rate of data transmitted from the terminal is decreased, the transmission power is decreased from the terminal. Therefore, in order to reduce the transmission spurious of the radio unit A5a in the reception band of the radio unit B5b, the transmission power of the signal transmitted from the radio unit A5a may be decreased. For this purpose, transmission from the radio unit A5a is performed. The data transmission rate should be lowered.

  For example, in one of the currently known communication systems, it is possible to use a transmission rate from a wireless terminal between 1843.2 kbps and 4.8 kbps. In such a system, if the rate of data to be transmitted at 1843.2 kbps is reduced to 4.8 kbps and transmitted, the total power becomes 1/384, and the transmission power decreases by about 26 dB. At this time, the transmission spurious of the radio unit A5a in the reception band of the signal received by the radio unit B5b is also reduced by about 26 dB, and the influence on the signal received by the radio unit B5b is reduced.

  FIG. 2 is a diagram for explaining the influence on the radio unit B5b by the transmission power of the radio unit A5a when the radio unit A5a and the radio unit B5b use different frequency bands. FIG. FIG. 6 is a diagram for explaining the influence on the radio unit B5b when the transmission power of the radio unit A5a is reduced by the above.

  As shown in FIG. 2, when the radio unit A5a performs transmission in the frequency band used by itself, the transmission power is above and below the frequency band used by itself as shown by reference numeral 9 in FIG. The level of the transmission power from the radio unit A5a becomes considerably high in the frequency band used by the radio unit B5b for the frequency band used by the radio unit B5b. For this reason, as already described, the radio unit B5b is affected by the transmission of the radio unit A5a.

  In the present invention, in such a case, control is performed so as to reduce the transmission power transmitted by the radio unit A5a. That is, the transmission power transmitted by the radio unit A5a is reduced from the state indicated by reference numeral 10 in FIG. 3 (same as the state shown in FIG. 2) to the state indicated by reference numeral 11. To do. As a result, the level of the transmission power from the radio unit A5a extending to the frequency band used for reception by the radio unit B5b becomes considerably small, and the radio unit B5b is affected by the transmission of the radio unit A5a. It becomes possible to prevent receiving.

  In the control of the present invention as described above, the control unit 7 shown in FIG. 1 monitors the reception rate of the signal received by the radio unit B5b, and when the rate is below the reference value, the radio unit This is control to lower the transmission rate of the signal transmitted by A5a. Accordingly, the embodiment of the present invention can perform communication using two or more communication methods or frequency bands at the same time by one wireless terminal 8, and can increase the speed of data reception.

  The control unit 7 includes a microcomputer, a memory, and the like, and is configured to perform the control as described above by causing the microcomputer to execute a program stored in the memory.

  FIG. 4 is a flowchart for explaining the processing operation in the embodiment of the present invention by the control unit 7, which will be described next.

(1) The control unit 7 detects the S / N ratio of the signal received by the radio unit B5b when the radio unit A5a transmits data and at the same time the radio unit B5b receives data. If the S / N ratio of the signal received by the radio unit B5b is greater than or equal to the reference value, the transmission / reception rate is changed for both the radio unit A5a and the radio unit B5b. The communication is continued without any change (steps 401 to 403 and 407).

(2) If the S / N ratio of the signal received by the radio unit B5b is less than the reference value in the determination in step 403, the control unit 7 has a large spurious due to the signal transmitted by the radio unit A5a. Judgment is made and a signal for lowering the transmission rate of the signal transmitted by the radio unit A5a is generated and output to the radio unit A5a (step 404).

(3) Since the transmission power of the signal transmitted by the radio unit A5a is decreased to decrease the transmission rate of the signal transmitted by the radio unit A5a that has received the signal for decreasing the transmission rate, the control unit 7 Then, the S / N ratio of the signal received by the radio unit B5b is detected again and compared with the reference value to determine whether the value of the S / N ratio is equal to or higher than the reference value (steps 405 and 406).

(4) If the value of the S / N ratio is greater than or equal to the reference value in the determination in step 406, the control unit 7 changes the transmission / reception rate for both the radio unit A5a and the radio unit B5b in the state at that time. If the S / N ratio value is less than or equal to the reference value, the process returns to step 404 and the transmission power of the signal transmitted by the radio unit A5a is lowered again. Then, the spurious in the reception band of the radio unit B5b due to the signal transmitted by the radio unit A5a is lowered (step 407).

  Although the embodiments of the present invention described so far have been described on the assumption that the radio unit A5a and the radio unit B5b perform communication using different communication methods, the present invention is not limited to the radio unit A5a and the radio unit. The present invention can also be applied to the case where the part B5b performs communication in different frequency bands using the same communication method. In this case, the wireless terminal 8 is in an area where communication can be performed in different frequency bands using the same communication method, and when both the wireless device unit A5a and the wireless device unit B5b receive, The unit A5a and the radio unit B5b each receive at a rate according to an instruction from the base station.

  In the embodiment of the present invention described above, when one of the two radio units performs transmission and the other performs reception, the value of the S / N ratio of the signal received by the radio unit on the receiving side is equal to or greater than the reference value. However, depending on the configuration of the wireless system, it may be difficult to determine the reference value of the S / N ratio, in which case the transmission side Therefore, the transmission power of the radio unit cannot be controlled.

  Even in the above case, the embodiment of the present invention constantly monitors the transmission data rate of the radio unit on the transmission side and the reception data rate of the radio unit on the reception side. And an optimum reception rate can be found.

  FIG. 5 is a diagram for explaining an example of a method of searching for an optimal transmission rate and an optimal reception rate by monitoring the transmission data rate of the transmission side radio unit and the reception data rate of the reception side radio unit. . 19 shown in FIG. 5A represents a change in the reception data rate of the radio unit B over time, and 20 shown in FIG. 5B represents a change in the transmission data rate of the radio unit A over time. Yes. The control of the reception data rate monitoring and the transmission data rate increase / decrease described below is performed by the control unit 7.

  Assume that transmission a1 ′ and reception a1 are performed at a certain rate at the radio unit A5a and the radio unit B5b. At this time, the transmission data rate of the radio unit A5a is reduced by a certain amount, that is, transmission power And try transmission a2 '. As already described above, decreasing or increasing the transmission data rate is synonymous with decreasing or increasing the transmission power. Therefore, hereinafter, it is expressed simply as decreasing or increasing the transmission data rate. Will be described. Then, as a result of observing the reception data rate of the radio unit B5b, if the reception data rate of the radio unit B5b is increased and reception a2 can be performed, the transmission data rate of the radio unit A5a is further reduced by a certain amount. The transmission a3 ′ is performed, and the reception data rate of the radio unit B5b is observed.

  Thereafter, the transmission data rate of the radio unit A5a is decreased by a certain amount, and when the radio unit B5b can receive data without changing the reception data rate, a5 and a5 ′, the transmission of the radio unit A5a Transmission a6 ′ is performed by increasing the data rate by a certain amount. As a result, if the radio unit B5b can perform the reception a6 with no change in the reception data rate, the transmission data rate of the radio unit A is increased by a certain amount until the reception data rate of the radio unit B5b decreases. Go.

  As a result, when the reception data rate of the wireless device unit B5b is reduced to reception a7, the transmission data rate of the wireless device unit A5a is decreased again by a certain amount and transmission 8a 'is performed. As a result, when the data reception a8 in which the reception data rate of the radio unit B5b is increased can be performed, the transmission data rate of the radio unit A5a is further reduced by a certain amount, and the reception data rate of the radio unit B5b is not changed. Observe.

  By repeating the processes as described above a9 · a9 ′, a10 · a10 ′, a11 · a11 ′,..., Transmission of the radio unit A5a is always performed while keeping the reception data rate of the radio unit B5b at the highest level. Data can be sent and received at the same time with the data rate being maximized.

  FIG. 6 is a diagram for explaining another example of a method for finding the optimum transmission rate and the optimum reception rate by monitoring the transmission data rate of the transmission side radio unit and the reception data rate of the reception side radio unit. It is. In FIG. 6A, 21 represents a change in the reception data rate of the radio unit B over time, and 22 shown in FIG. 6B represents a change in the transmission data rate of the radio unit A over time. Yes. The control of the reception data rate monitoring and the transmission data rate increase / decrease described below is performed by the control unit 7.

  As in the case described with reference to FIG. 5, it is assumed that transmission a1 ′ and reception a1 are being performed at a certain rate at the radio unit A5a and the radio unit B5b. At this time, the transmission data rate of the radio unit A5a And perform transmission a2 ′ with a certain amount lowered. As a result of observing the reception data rate of the radio unit B5b, it is assumed that the radio unit B5b was able to perform reception a2 without changing the reception data rate.

  In this case, the transmission data rate of the radio unit A5a is increased by a certain amount until the reception data rate of the radio unit B5b decreases. As a result, when the reception a6 in which the reception data rate of the radio unit B5b is reduced is performed, the transmission a7 ′ in which the transmission data rate of the radio unit A5a is again reduced by a certain amount is performed, thereby the radio unit B5b. If the reception data rate can be increased, the transmission data rate of the radio unit A is further reduced by a certain amount, and the reception data rate of the radio unit B5b is not changed. Observe.

  By repeating the processes as described above a9 · a9 ′, a10 · a10 ′, a11 · a11 ′,..., Transmission of the radio unit A5a is always performed while keeping the reception data rate of the radio unit B5b at the highest level. Data can be sent and received at the same time with the data rate being maximized.

  The wireless terminal 8 according to the above-described embodiment of the present invention can be used while being carried by a user by being incorporated in a mobile phone, a PDA, or the like. Also, the wireless terminal 8 is configured in a card type and connected to an information device such as a personal computer. Can also be used.

  FIG. 7 is a diagram illustrating an example of the wireless terminal 8 configured in a card type. In the example shown in FIG. 7, a wireless terminal 8 having a plurality of wireless units as shown in FIG. 1 is configured in a card-type casing to form a card-type wireless terminal 13, and an interface provided in the casing Thus, it is possible to connect to an information device 12 such as a desktop computer or a notebook computer. In the example illustrated in FIG. 7, each of the plurality of radio units (two in the illustrated example) is provided with an antenna, but the antenna may be shared to be one. With such a configuration, the information device 12 can transmit and receive data using the card-type wireless terminal 13.

  FIG. 8 is a diagram illustrating another example of a wireless terminal configured in a card type. In the example shown in FIG. 8, a wireless terminal having a plurality of wireless units as shown in FIG. 1 is configured in a card-type casing to form a card-type wireless terminal 15, and the card-type wireless terminal 15 is connected to a USB. In this example, the interface cable 14 such as a cable can be connected to the information device 12 such as a personal computer. In the example shown in FIG. 8, each of the plurality of radio units (two in the illustrated example) is provided with an antenna. However, the antenna may be shared to be one. With this configuration, the information device 12 can transmit and receive data using the card-type wireless terminal 15.

  FIG. 9 is a diagram showing an example in which each of a plurality of radio units (two in the illustrated example) included in the radio terminal is configured in a card type. In the example shown in FIG. 9, each of the radio units A and B in the radio terminal illustrated and described in FIG. 1 is configured as a card type radio unit 16 a and 16 b with an antenna in a card type casing, This is an example in which the information device 12 such as a personal computer can be connected by an interface provided in the housing. In the example shown in FIG. 9, the function of the control unit 7 described with reference to FIG. 1 is provided in the information device 12 such as a personal computer. With such a configuration, the information device 12 can transmit and receive data using the card-type radio units 16a and 16b.

  FIG. 10 is a diagram illustrating another example in which each of a plurality of wireless device units (two in the illustrated example) included in the wireless terminal is configured in a card shape. In the example shown in FIG. 10, similarly to the case described with reference to FIG. 9, each of the radio units A and B in the radio terminal is used as a card type radio unit 18a and 18b with an antenna in a card type casing. In this example, the control unit 7 in the wireless terminal 8 is a control unit 17 configured in a separate housing. Then, the card-type radio units 18a and 18b are connected to the control unit 17 by an interface provided in their cases, and the control unit 17 is connected to the information device 12 such as a personal computer by an interface cable 14 such as a USB cable. Connectable. In the above description, the card-type radio units 18a and 18b and the control unit 17 can be easily attached and detached, and the user can freely replace the card-type radio unit as necessary. With this configuration, the information device 12 can transmit and receive data using the card type radio units 16a and 16b.

  In the example illustrated in FIG. 10, the control unit 17 is described as being configured in a separate housing. However, in the present invention, the control unit is provided in the information device, and is illustrated as the control unit 17 in FIG. 10. Another case may be used as a simple interface box so that the card-type radio units 18a and 18b have a function of simply connecting to the information device 12.

  The examples shown in FIG. 9 and FIG. 10 have been described on the assumption that two radio units are configured in a card type. However, the present invention further configures a number of radio units in a card type and configures them as information devices. It can also be used by connecting to.

1a Receiver A
1b Receiver B
2a Transmitter A
2b Transmitter B
3a Transceiver circuit part A
3b Transmission / reception circuit part B
4a Signal processor A
4b Signal processor B
5a Radio unit A
5b Radio unit B
6a Antenna A
6b Antenna B
7 Control unit 8 Wireless terminal

Claims (14)

A radio unit A composed of a transmission / reception circuit unit A and a signal processing unit A, a radio unit B composed of a transmission / reception circuit unit B and a signal processing unit B, and a control unit for controlling the radio unit A and the radio unit B The radio unit A performs radio communication with the base station by the radio communication method A by the antenna A connected to the radio unit A, and the radio unit B is connected to the radio unit B. Wireless communication with the base station is performed with the antenna B in the wireless communication system B different from the wireless communication system A,
The control unit monitors the reception rate of the radio unit that is receiving and transmits when one of the radio units is transmitting and the other is receiving A radio terminal characterized by optimally controlling a reception rate at a radio unit performing reception by controlling a transmission rate of a unit.   The wireless communication system A and the wireless communication system B further includes one or a plurality of radio units that perform radio communication with a base station using a radio communication method different from the radio communication method B, and an antenna corresponding to the radio unit, The control unit controls radio unit A, radio unit B, and one or a plurality of radio units that perform radio communication with a base station using a radio communication scheme different from radio communication scheme A and radio communication scheme B. The wireless terminal according to claim 1, wherein:   The radio terminal according to claim 1, wherein the radio unit A and the radio unit B are shared by using the antenna A and the antenna B as one antenna.   The antenna corresponding to one or a plurality of radio units that perform wireless communication with a base station by a wireless communication method different from the antenna A, the antenna B, and the wireless communication method A and the wireless communication method B is one antenna. As described above, the wireless unit A, the wireless unit B, and one or more wireless units that perform wireless communication with a base station using a wireless communication method different from the wireless communication method A and the wireless communication method B are shared. The wireless terminal according to claim 2. A radio unit A composed of a transmission / reception circuit unit A and a signal processing unit A, a radio unit B composed of a transmission / reception circuit unit B and a signal processing unit B, and a control unit for controlling the radio unit A and the radio unit B The radio unit A performs radio communication with a base station in the frequency band A of the radio communication system 1 by an antenna A connected to the radio unit A, and the radio unit B Wireless communication with a base station in a frequency band B different from the frequency band A of the wireless communication method 1 by the antenna B connected to
The control unit monitors the reception rate of the radio unit that is receiving and transmits when one of the radio units is transmitting and the other is receiving A radio terminal characterized by optimally controlling a reception rate at a radio unit performing reception by controlling a transmission rate of a unit.   One or a plurality of radio units that perform radio communication with a base station in a frequency band different from the frequency band A and the frequency band B of the radio communication method 1, and an antenna corresponding to the radio unit And the control unit controls one or more radio units that perform radio communication with a base station in a frequency band different from the radio unit A, the radio unit B, and the frequency band A and the frequency band B. The wireless terminal according to claim 5, wherein:   6. The radio terminal according to claim 5, wherein the radio unit A and the radio unit B share the antenna A and the antenna B as one antenna.   One antenna corresponding to one or a plurality of radio units that perform radio communication with a base station in a frequency band different from the frequency band A and the frequency band B of the antenna A, the antenna B, and the radio communication method 1 One or a plurality of radios that perform radio communication with a base station using a frequency band different from the frequency band A and the frequency band B of the radio unit A, the radio unit B, and the radio communication method 1 as an antenna of the book 7. The wireless terminal according to claim 6, wherein the wireless terminal is shared.   9. The wireless terminal according to claim 1, wherein the wireless terminal is used by being built in a mobile phone.   The wireless terminal according to any one of claims 1 to 8, wherein the wireless terminal is used by being connected to an information device through an interface provided in the card-type housing.   The radio unit A and the antenna A corresponding to the radio unit A, and the radio unit B and the antenna B corresponding to the radio unit B are configured in a card-type casing, 6. The wireless terminal according to claim 1, wherein the wireless terminal is used by being connected to an information device through an interface provided.   Each of the radio unit A and the antenna A corresponding to the radio unit A and the radio unit B and the antenna B corresponding to the radio unit B are provided as a card type radio unit in a card-type casing. The control unit configured to control the radio unit A and the radio unit B is configured in another case, and is connected to the control unit in another case by an interface provided in the case of the card type radio unit. 6. The wireless terminal according to claim 1, wherein the wireless terminal is used by connecting a control unit in another casing to an information device.   Radio unit A and antenna A corresponding to radio unit A, radio unit B and antenna B corresponding to radio unit B, one or more other radio units and their radio units The wireless terminal according to claim 2 or 6, wherein each of the corresponding antennas is configured in a card-type casing, and is used by being connected to an information device by an interface provided in the casing.   Radio unit A and antenna A corresponding to radio unit A, radio unit B and antenna B corresponding to radio unit B, one or more other radio units and their radio units Each of the corresponding antennas is configured as a card-type radio unit in a card-type casing, and a radio unit A, a radio unit B, and a control unit that controls one or more other radio units are separated. It is used in the case of connecting to a control unit in another case by an interface provided in the case of the card type radio unit, and connecting the control unit in another case to information equipment. The wireless terminal according to claim 2, wherein the wireless terminal is a wireless terminal.