JP4640836B2 - Wireless communication method and wireless communication apparatus - Google Patents

Description

  The present invention relates to a wireless communication method and a wireless communication apparatus that implements the wireless communication method.

  In recent years, there are a plurality of systems corresponding to respective standards in wireless communication apparatuses such as mobile phones. For example, TDMA and CDMA systems are widespread in Japanese mobile phone systems.

  Normally, a wireless communication device is configured to support any one of the standards, but in recent mobile phone systems, for example, the frequency band assigned to each system is tight as mobile phone terminals become widespread. Therefore, the transition to multiband is considered. In addition, in order to provide a stable and highly functional service, a handoff between different frequency bands and a multi-mode for performing a plurality of operation modes (for example, a 1x mode and a 1xEV-DO mode) have been performed.

  As a wireless communication apparatus supporting such multiband, for example, a TDMA system and a CDMA system are combined, a TDMA transmission / reception unit and a CDMA transmission unit are combined with a main antenna, and a CDMA reception unit is combined with a sub-antenna. There is known a mobile phone terminal in which is connected (see, for example, Patent Document 1).

  Recently, there is also a multi-band mobile phone terminal capable of hybrid operation equipped with an SHDR (Simultaneous Hybrid Dual Receive) function that performs transmission and reception of a system that is a primary antenna and at the same time receives other systems by a secondary antenna. It is considered.

  FIG. 5 is a block diagram showing a schematic configuration of a main part of a multiband-compatible mobile phone terminal that enables such a hybrid operation.

  This mobile phone terminal includes an 800 MHz band CDMA system (hereinafter abbreviated as 800 MHz band), a 2 GHz band CDMA system (hereinafter abbreviated as 2 GHz band), and a 1575.42 MHz (hereinafter also referred to as 1.5 GHz band) GPS. In the 1xEV-DO of 800 MHz band and 2 GHz band, which has a frequency reception function, a diversity method is adopted in order to improve throughput in data communication.

  In FIG. 5, a duplexer 103 for an 800 MHz band and a duplexer 104 for a 2 GHz band are coupled to a first antenna 101, which is a main antenna, via a diplexer 102 that separates an 800 MHz band and a 2 GHz band. A transmission unit (Tx) 105 and a reception unit (Rx) 106 for 800 MHz band are connected to each other, and a transmission unit 107 and a reception unit 108 for 2 GHz band are connected to the duplexer 104.

  The second antenna 111, which is a sub antenna, is connected to an 800 MHz band receiving unit 113, a 2 GHz band receiving unit 114, and a GPS receiving unit 115 via a triplexer 112, which is a frequency demultiplexer. .

  According to the mobile phone terminal having such a configuration, for example, the first antenna 101 is used for transmission / reception of 1xEV-DO in the 800 MHz band, and the second antenna 111 is used for diversity in 1xEV-DO communication, 800 MHz band or 2 GHz band by the SHDR function. It can be used for 1x incoming (hybrid operation), GPS frequency reception.

JP 2004-15162 A

  By the way, in the mobile phone terminal shown in FIG. 5, it is necessary to resonate the first antenna 101 in two bands of the 800 MHz band and the 2 GHz band, and the second antenna 111 further has three bands including the 1.5 GHz band. It is necessary to resonate.

  However, in general, it is difficult to resonate one antenna in a plurality of bands, particularly three or more bands, because of the characteristics of the antenna. Therefore, sufficient antenna gain cannot be obtained in each band.

  FIG. 6 shows an example of the antenna gains of the first antenna 101 and the second antenna 111 described above. In FIG. 6, the first antenna 101 has a relatively high antenna gain in two bands of 800 MHz band and 2 GHz band. However, since the second antenna 111 is tuned to the GPS frequency, the 800 MHz band and 2 GHz band are obtained. The antenna gain in each band is lower than that of the first antenna 101.

  Also, since it is technically difficult to reduce both the transmission loss and the reception loss in the duplexer 103 in the 800 MHz band and the duplexer 104 in the 2 GHz band, in general, the transmission loss is prioritized and smaller than the reception loss. Designed to do.

  For this reason, in the mobile phone terminal shown in FIG. 5, when the first antenna 101 is used to receive a radio wave in the 800 MHz band, the reception sensitivity of the receiving system increases, for example, as shown in FIG. It will deteriorate. If the reception sensitivity deteriorates when the transmission power increases in this way, the mobile phone terminal normally performs power control to keep the relationship between the transmission power and the reception power constant with the radio base station. In 1x communication in which diversity is not performed, communication quality may be deteriorated, such as call disconnection or the like at the area edge of the base station where transmission power increases.

  As one method for preventing the deterioration of reception sensitivity at such high transmission power, it is conceivable to further improve the isolation performance of the duplexer 103. However, in this case, there is a concern that the number of filter stages increases, leading to an increase in insertion loss between the transmitter and the antenna and between the antenna and the receiver in each duplexer, and an increase in the component size. In addition, there is a concern that the development cost may increase and the yield may decrease.

  As another method, it is conceivable to use the second antenna 111 as a main reception path and the first antenna 101 as a sub reception path. In this way, the receiving sensitivity of the receiving system when the second antenna 111 is used to receive a radio wave in the 800 MHz band is such that the gain of the second antenna 111 is lower than the gain of the first antenna 101. FIG. As shown in FIG. 4, when the transmission power is low, the reception sensitivity is lower than when the first antenna 101 is used. However, when the transmission power is high, it is difficult to be affected by transmission. It is possible to make the deterioration of the reception sensitivity in the case of the first antenna 101 smaller than when the first antenna 101 is used.

  However, in the mobile phone terminal, as described above, since power control is performed to maintain a constant relationship between the transmission power and the reception power with the radio base station, the transmission power probability during communication is, for example, As shown in FIG. 8, it is rare for the terminal to communicate near the maximum transmission power. For this reason, when the second antenna 111 is used for the main reception path, the reception sensitivity of the main reception path can be increased at the area edge where the transmission power becomes high. The reception sensitivity of the main reception path is lower than the reception sensitivity of the sub reception path, which is inefficient in 1x communication that does not perform diversity.

  Such a phenomenon also occurs when receiving the 2 GHz band using the first antenna 101 and the second antenna 111.

  In FIG. 5, the first antenna 101 is used for transmission / reception of two bands of the 800 MHz band and the 2 GHz band, and the second antenna 111 is further used for reception of three bands including the 1.5 GHz band. However, the first antenna 101 is used for transmission / reception of one band (first band) of, for example, 800 MHz band or 2 GHz band, and the second antenna 111 is connected to the first band of the first antenna 101, for example, GPS 1. When it is configured to use for reception of two bands with the second band of 5 GHz band, when the antenna gain of the first band in the second antenna 111 is lower than the antenna gain of the first band by the first antenna 101 Will cause a similar problem.

  In addition to the multi-band, in a mono-band configuration in which a transmission / reception unit of, for example, an 800 MHz band is connected to the first antenna 101 via a duplexer, and a reception unit of the same 800 MHz band is connected to the second antenna 111. This also occurs due to the isolation performance of the duplexer connected to the first antenna 101.

  Therefore, an object of the present invention made in view of such circumstances is to efficiently transmit radio waves in a desired frequency band without causing an increase in insertion loss, an increase in size and cost, and a decrease in sensitivity due to an increase in transmission power. It is an object of the present invention to provide a wireless communication method capable of receiving and a wireless communication apparatus that implements the method.

The invention of the wireless communication method according to claim 1 that achieves the above object is as follows:
When simultaneously transmitting and receiving radio waves in the first frequency band using the transmission means and the first reception means coupled to the first antenna via the duplexer, and the second reception means coupled to the second antenna,
Measure the transmission power of the transmission means by transmission power measurement means ,
A transmission power measurement value measured by the transmission power measurement means ;
The reception sensitivity characteristic of the reception system from the first antenna to the first reception means with respect to the transmission power of the transmission means;
The receiving sensitivity characteristic of the receiving system from the second antenna to the second receiving means with respect to the transmission power of the transmitting means;
Based on the comparison, the selection means selects the output of the first receiving means or the second receiving means of the receiving system with high receiving sensitivity .

Furthermore, the invention of the wireless communication device according to claim 2 that achieves the above object is as follows:
A first antenna for transmitting and receiving radio waves in a first frequency band;
A duplexer connected to the first antenna;
Transmitting means and first receiving means of the first frequency band connected to the duplexer;
A second antenna for receiving radio waves of the first frequency band and a second frequency band different from the first frequency band;
Demultiplexing means for demultiplexing the received signals of the first frequency band and the second frequency band received by the second antenna;
Second receiving means for inputting the received signal of the first frequency band to be demultiplexed by the demultiplexing means;
Third receiving means for inputting the received signal of the second frequency band to be demultiplexed by the demultiplexing means;
Transmission power measurement means for measuring the transmission power of the transmission means;
Selecting means for selecting outputs of the first receiving means and the second receiving means;
Selection control means for controlling the selection means based on a transmission power measurement value by the transmission power measurement means ,
The receiving sensitivity of the receiving system from the first antenna to the first receiving means is lower than the receiving sensitivity of the receiving system from the second antenna to the second receiving means at or above the predetermined transmission power of the transmitting means. Is,
The selection control means uses the predetermined transmission power value as a threshold, and when the transmission power measurement value is less than the threshold based on a comparison between the threshold and the transmission power measurement value, the output of the first reception means When the transmission power measurement value is equal to or greater than the threshold value, the selection unit is controlled to select the output of the second reception unit .

The invention according to claim 3 is the wireless communication apparatus according to claim 2 ,
The first frequency band is an 800 MHz band or a 2 GHz band,
The second frequency band includes a GPS frequency.

The invention according to claim 4 is the wireless communication apparatus according to claim 3 ,
Positioning is performed by alternately executing a radio wave transmission / reception operation of the first frequency band and a radio wave reception operation of the second frequency band.

The invention according to claim 5 is the wireless communication apparatus according to claim 3 ,
The positioning is performed by simultaneously executing the transmission / reception operation of the first frequency band radio wave and the reception operation of the second frequency band radio wave.

  According to the present invention, the transmission power of the radio wave in the first frequency band transmitted from the transmission means via the duplexer and the first antenna is measured, and the first antenna is connected to the first antenna via the duplexer based on the measured transmission power value. Since the reception output obtained from the coupled first receiving means or the reception output obtained from the second receiving means coupled to the second antenna is selected, a duplexer having a normal isolation characteristic is used to select the first output. It becomes possible to efficiently receive radio waves in the frequency band without causing a decrease in sensitivity due to an increase in transmission power. Moreover, since a duplexer having a normal isolation characteristic can be used, an increase in insertion loss, an increase in size, and an increase in cost can be avoided.

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

  FIG. 1 is a block diagram showing a schematic configuration of a wireless communication apparatus according to an embodiment of the present invention. The wireless communication apparatus according to the present embodiment is a multiband-compatible mobile phone terminal having an 800 MHz band and 2 GHz band CDMA system and a 1.5 GHz band GPS reception function, as in FIG. The band adopts a diversity method in order to improve the throughput in data communication.

  The first antenna 1, which is the main antenna, is coupled to the duplexer 3 for the 800 MHz band and the duplexer 4 for the 2 GHz band through the diplexer 2 that separates the 800 MHz band and the 2 GHz band. The transmission unit 5 and the reception unit 6 are connected to each other, and the transmission unit 7 and the reception unit 8 for the 2 GHz band are connected to the duplexer 4.

  The transmission unit 5 for the 800 MHz band includes a baseband conversion unit 11, a bandpass filter 12, and a power amplifier 13. The RF transmission signal output from the baseband conversion unit 11 is band-limited by the bandpass filter 12. After that, it is amplified to a predetermined level by the power amplifier 13, and is radiated as a radio wave from the first antenna 1 through the duplexer 3 and the diplexer 2.

  The receiving unit 6 for the 800 MHz band includes a low noise amplifier (LNA) 15, a bandpass filter 16 and a baseband converting unit 17. The receiving unit 6 receives the first antenna 1, receives the diplexer 2 and the duplexer 3. The received signal of the 800 MHz band radio wave input after being amplified by the low noise amplifier 15 is band-limited by the bandpass filter 16 and supplied to the baseband converter 17 where it is demodulated and output. It has become.

  Similarly, the 2 GHz band transmission unit 7 includes a baseband conversion unit 21, a bandpass filter 22, and a power amplifier 23, and an RF transmission signal output from the baseband conversion unit 21 is a bandpass filter 22. After being band-limited at, the power amplifier 23 amplifies the signal to a predetermined level and radiates as a radio wave from the first antenna 1 through the duplexer 4 and the diplexer 2.

  The 2 GHz band receiver 8 includes a low noise amplifier 25, a bandpass filter 26 and a baseband converter 27, and is received by the first antenna 1 and input via the diplexer 2 and the duplexer 4. The received signal of the 2 GHz band radio wave is amplified by the low noise amplifier 25, band-limited by the band pass filter 26, supplied to the baseband conversion unit 27, demodulated here, and output. Yes.

  On the other hand, an 800 MHz band receiving unit 33, a 2 GHz band receiving unit 34, and a GPS receiving unit 35 are connected to a second antenna 31 that is a sub antenna via a triplexer 32 that is a demultiplexing unit.

  The 800 MHz band reception unit 33 includes a bandpass filter 41, a low noise amplifier 42, a bandpass filter 43, and a baseband conversion unit 44. An 800 MHz band reception signal input through the triplexer 32 is a bandpass filter. After the band is limited by the filter 41, the signal is amplified by the low noise amplifier 42, further band-limited by the band pass filter 43, demodulated by the baseband conversion unit 44, and output.

  Similarly, the 2 GHz band reception unit 34 includes a band pass filter 45, a low noise amplifier 46, a band pass filter 47, and a baseband conversion unit 48, and a 2 GHz band reception signal input via the triplexer 32 is After being band-limited by the band-pass filter 45, amplified by the low-noise amplifier 46, further band-limited by the band-pass filter 47, demodulated by the baseband converter 48 and output.

  Similarly, the GPS receiving unit 35 includes a bandpass filter 51, a low noise amplifier 52, a bandpass filter 53, and a baseband converting unit 54. A GPS frequency received signal input via the triplexer 32 is After being band-limited by the band-pass filter 51, amplified by the low-noise amplifier 52, and further band-limited by the band-pass filter 53, demodulated and output by the baseband converter 54.

  Here, the first antenna 1 and the second antenna 31 have the same antenna gain as the first antenna 101 and the second antenna 111 shown in FIG. That is, the second antenna 31 is tuned to a GPS frequency of 1.5 GHz band, and the antenna gain in each band of the 800 MHz band and the 2 GHz band is lower than that of the first antenna 1.

  Further, the duplexer 3 for the 800 MHz band and the duplexer 4 for the 2 GHz band are designed so that the transmission loss is smaller than the reception loss, as in the normal case.

  800 MHz band transmitter 5 and receiver 6 connected to the first antenna 1, 2 GHz band transmitter 7 and receiver 8, 800 MHz band receiver 33 connected to the second antenna 31, 2 GHz The entire operation including the band receiving unit 34 and the GPS receiving unit 35 is controlled by the control unit 61 according to the communication mode.

  In the present embodiment, as a communication mode, for example, 1x mode of 800 MHz band or 2 GHz band, 1xEV-DO mode of 800 MHz band or 2 GHz band, hybrid mode by SHDR function between different bands in 800 MHz band and 2 GHz band, GPS Positioning mode, etc. can be executed.

  Here, the 1x mode may be executed alone, or may be executed in the hybrid mode or the GPS positioning mode. The 1xEV-DO mode employs space diversity using the first antenna 1 and the second antenna 31.

  In the GPS positioning mode, the positioning process is shared with the positioning server of the communication carrier. The GPS positioning mode includes a TM-GPS positioning mode shown in FIG. 2 (a) and an S-GPS positioning mode shown in FIG. 2 (b).

  In the TM-GPS positioning mode shown in FIG. 2A, a GPS information receiving operation in which GPS information from a GPS satellite is received by the GPS receiving unit 35 via the second antenna 31, and a GPS acquired by this GPS receiving operation. The CDMA operation of transmitting the information to the base station in the 1 × mode in the 800 MHz band or the 2 GHz band, for example, and receiving the position information calculated by the positioning server is alternately performed. In the S-GPS positioning mode shown in FIG. 2B, the GPS information receiving operation by the GPS receiving unit 35 and the CDMA operation in the 1 × mode in the 800 MHz band or the 2 GHz band are performed simultaneously. Which of the TM-GPS positioning mode and the S-GPS positioning mode is executed is determined by the mounted hardware.

  As described above, in the present embodiment, the first antenna 1 transmits and receives either the 800 MHz band or the 2 GHz band, so the 800 MHz band or the 2 GHz band corresponds to the first frequency band, and the 2 GHz band (the 800 MHz band is changed). The first frequency band) or the 800 MHz band (when the 2 GHz band is the first frequency band), or the 1.5 GHz band of GPS corresponds to the second frequency band.

  In the present embodiment, the reception unit of the same band connected to each of the first antenna 1 and the second antenna 31 includes the 1x mode based on the transmission power of the radio wave of the band transmitted from the first antenna 1. In the communication mode, the higher reception sensitivity is selected as the reception path, and in the communication mode including the 1xEV-DO mode employing the diversity method, the higher reception sensitivity is selected as the main reception path, and the other is selected as the sub reception path.

  For this reason, as shown in FIG. 1, power measurement for measuring the transmission power output from the power amplifier 13 of the transmitter unit 5 for 800 MHz band and the power amplifier 23 of the transmitter unit 7 for 2 GHz band that are selectively driven. A unit (HDET) 65 is provided, and a power measurement value obtained by the power measurement unit 65 is supplied to the control unit 61.

  Further, for the 800 MHz band, it is a selection means for selecting the output of the receiving unit 6 connected to the first antenna 1 and the output of the receiving unit 33 connected to the second antenna 31 according to the communication mode. A reception changeover switch unit 66 is provided.

  Similarly, also for the 2 GHz band, selection means for selecting the output of the receiving unit 8 connected to the first antenna 1 and the output of the receiving unit 34 connected to the second antenna 31 according to the communication mode. A reception changeover switch unit 67 is provided.

  Further, the control unit 61 is provided with a selection control unit 68 that controls the reception changeover switch unit 66 or 67 corresponding to the transmission band for which the power is measured based on the power measurement value from the power measurement unit 65.

  In the present embodiment, a memory 70 is provided in the control unit 61, a threshold value for each transmission band is stored in advance in the memory 70, and the power measurement value measured by the power measurement unit 65 in the selection control unit 68 and the memory 70. Is compared with the threshold value of the corresponding transmission band stored in, and based on the comparison result, the reception changeover switch unit 66 or 67 corresponding to the transmission band is controlled.

  Here, the threshold value for each transmission band stored in the memory 70 in advance is, for example, as shown in FIG. The power value.

  FIG. 3 is a flowchart showing an operation example of the mobile phone terminal according to the present embodiment, and shows an operation in a communication mode in which the 1x mode is executed alone.

  Hereinafter, a case where communication is performed in the 800 MHz band will be described as an example with reference to FIG. First, when communication is started, the transmission power output from the power amplifier 13 for the 800 MHz band is measured by the power measurement unit 65 (step S1), and the measured power value is output to the selection control unit 68 of the control unit 61. To do.

  The selection control unit 68 compares the power measurement value from the power measurement unit 65 with the 800 MHz band threshold value stored in the memory 70 to determine whether the power measurement value is equal to or greater than the threshold value (step S2). .

  As a result, when the power measurement value is less than the threshold value, the reception switching switch unit 66 selects the 800 MHz band reception unit 6 connected to the first antenna 1 side as the reception path of the 1x mode, and the reception output thereof. Is processed (step S3).

  On the other hand, when the power measurement value is equal to or greater than the threshold, the output of the 800 MHz band receiver 33 connected to the second antenna 31 side is selected as the 1x mode reception output (1x) by the reception changeover switch 66. (Step S4).

  The above processing is repeated until the end of communication is detected in step S5.

  FIG. 4 is a flowchart showing another operation example of the mobile phone terminal according to the present embodiment, and shows the operation in the communication mode for executing the TM-GPS positioning mode including the 1x mode.

  Similarly, a case where communication is performed in the 800 MHz band will be described as an example. First, when the TM-GPS positioning mode is started, data communication is started with the positioning server of the communication carrier via the base station in the 1x mode of the 800 MHz band (step S11).

  In this data communication, similarly to the case of FIG. 3, the transmission power output from the power amplifier 13 is measured by the power measurement unit 65 (step S12), and the threshold value stored in the memory 70 by the selection control unit 68 is determined. A comparison determination is made (step S13), and if the power measurement value is less than the threshold value, the reception switching switch 66 selects the reception unit 6 connected to the first antenna 1 side as the reception path of the 1x mode (step S14). ) If the power measurement value is equal to or greater than the threshold value, the reception selector switch unit 66 selects the reception unit 33 connected to the second antenna 31 as the reception path of the 1x mode (step S15). Process the received signal.

  When predetermined communication with the positioning server is completed, data communication with the base station is temporarily terminated (step S16), and GPS information from GPS satellites is obtained by the GPS receiver 35 connected to the second antenna 31 side. Receive (step S17).

  Then, it transfers to step S11 and transmits the GPS information received by step S17 to a positioning server via a base station, and receives the positional information calculated by the positioning server.

  The above communication operation with the base station in the 1x mode and the GPS information reception operation from the GPS satellite by the GPS receiving unit 35 are alternately repeated until the end of the positioning mode is detected in step S18.

  In the case of the S-GPS positioning mode including the 1x mode, reception of GPS information from a GPS satellite by the GPS receiver 35 connected to the second antenna 31 is performed simultaneously with the communication operation according to the flowchart of FIG. What is necessary is just to perform operation | movement.

  Further, in the case of a communication mode including a 1xEV-DO mode employing a diversity method, a comparison result between a power measurement value measured by the power measurement unit 65 and a corresponding transmission band threshold value stored in the memory 70 is obtained. Based on this, when the power measurement value is less than the threshold value, the output of the receiving unit connected to the first antenna 1 side is the main receiving path, and the receiving unit connected to the second antenna 31 side is the sub receiving path. If the measured power value is greater than or equal to the threshold value, the output of the receiving unit connected to the first antenna 1 side is the sub-receiving path, and the receiving unit connected to the second antenna 31 side is the main receiving path. The reception changeover switch 66 or 67 is controlled so as to select.

  As described above, in the present embodiment, in the 800 MHz band or 2 GHz band in which transmission / reception is performed via the first antenna 1, reception sensitivity decreases as transmission power increases due to transmission / reception isolation performance in the duplexer 3 or 4. On the other hand, when the 800 MHz band or the 2 GHz band is received via the second antenna 31 having an antenna gain lower than that of the first antenna 1, even if the transmission power from the first antenna 1 is increased, transmission is not possible. Paying attention to the fact that the reception sensitivity is less affected than the case where the first antenna 1 is used. In particular, in the 1x mode, which has a large influence on the incoming call rate, reception of the reception system using the first antenna 1 is important. When the transmission power at which the sensitivity and the reception sensitivity of the reception system using the second antenna 31 are reversed is set as a threshold, and the transmission power is less than the threshold, the reception sensitivity Selects a received signal by the receiving system using a high first antenna 1, when the transmission power is equal to or larger than the threshold, the receiving sensitivity is to choose a received signal by the receiving system using the high second antenna 31.

  Therefore, the duplexer 3 or 4 connected to the first antenna 1 uses a normal isolation type, and efficiently receives radio waves in the 800 MHz band or 2 GHz band without causing a decrease in sensitivity due to an increase in transmission power. can do. Further, since the duplexer 3 or 4 can be a normal isolation one, it is possible to avoid an increase in insertion loss, an increase in size, and an increase in cost.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible. For example, in the above embodiment, the 800 MHz band, the 2 GHz band, and the GPS frequency are three bands. However, the first antenna 1 is used for transmission / reception of one band of the 800 MHz band or the 2 GHz band, for example, and the second antenna 31 is More than 4 bands including the transmission / reception band by the first antenna 1 and the 1.5 GHz band for GPS, for example, and the addition of 1.5 GHz band other than PHS 1.9 GHz and GPS frequency In this case, the present invention can be applied effectively. Further, the frequency band is not limited to the above frequency, and may be an arbitrary frequency band. Further, in the configuration shown in FIG. 1, the transmitter and the receiver that are not used in the communication mode to be executed can be turned off and communicate with the base station in the TM-GPS positioning mode. In a period during which no GPS information is received, the power to the corresponding transmitting / receiving unit and the GPS information receiving unit 35 can be turned off.

  In addition, for example, an 800 MHz band and a 2 GHz band transmission / reception unit are connected to the first antenna, and transmission / reception in the 800 MHz band or 2 GHz band is selectively performed, and the second antenna receives each of the 800 MHz band and 2 GHz band reception units. The present invention can be effectively applied even when communication is performed only in one of the bands and a hybrid operation between the bands is performed. That is, in this case, since the first antenna side and the second antenna side are the same band, even if the first antenna and the second antenna can have substantially the same characteristics, the first antenna has an 800 MHz band or Since a duplexer for transmitting and receiving the 2 GHz band is used, depending on the isolation characteristics, the reception sensitivity of the reception system using the first antenna may be higher than that of the reception system in the same band using the second antenna at high transmission power. It may be lower than the reception sensitivity. Therefore, in such a case, the same effect can be obtained by switching the reception system in the same manner as in the above-described embodiment.

  Similarly, a 1-band transmission / reception unit of, for example, 800 MHz band is connected to the first antenna via a duplexer, and a reception unit of the same 800-MHz band is connected to the second antenna, for example, 1x mode in which diversity reception is not performed, The present invention can also be effectively applied to a mono-band configuration that selectively performs the 1xEV-DO mode in which diversity reception is performed.

It is a block diagram which shows schematic structure of the mobile telephone terminal which concerns on one embodiment of this invention. It is a figure for demonstrating GPS positioning mode. 3 is a flowchart showing an operation example of the mobile phone terminal shown in FIG. 1. Similarly, it is a flowchart which shows another operation example. It is a block diagram which shows schematic structure of the principal part of the mobile telephone terminal corresponding to a multiband which can carry out a hybrid operation. It is a figure which shows an example of the antenna gain of the 1st antenna shown in FIG. 5, and a 2nd antenna. Similarly, it is a figure which shows the receiving sensitivity characteristic with respect to the transmission power of the receiving system of a 1st antenna, and the receiving system of a 2nd antenna. It is a figure which shows the transmission power probability of a mobile telephone terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st antenna 2 Diplexer 3, 4 Duplexer 5, 7 Transmitter 6, 8, 33, 34, 35 Receiver 11, 17, 21, 27, 44, 48, 54 Baseband converter 12, 16, 22, 26 , 41, 43, 45, 47, 51, 53 Band pass filter 13, 23 Power amplifier 15, 25, 42, 46, 52 Low noise amplifier (LNA)
31 Second antenna 32 Triplexer 61 Control unit 65 Power measurement unit (HDET)
66, 67 Reception selector switch section 68 Selection control section 70 Memory

Claims (5)

When simultaneously transmitting and receiving radio waves in the first frequency band using the transmission means and the first reception means coupled to the first antenna via the duplexer, and the second reception means coupled to the second antenna,
Measure the transmission power of the transmission means by transmission power measurement means ,
A transmission power measurement value measured by the transmission power measurement means ;
The reception sensitivity characteristic of the reception system from the first antenna to the first reception means with respect to the transmission power of the transmission means;
The receiving sensitivity characteristic of the receiving system from the second antenna to the second receiving means with respect to the transmission power of the transmitting means;
A radio communication method characterized in that the output of the first receiving means or the second receiving means of the receiving system with high receiving sensitivity is selected by the selecting means based on the comparison of the above. A first antenna for transmitting and receiving radio waves in a first frequency band;
A duplexer connected to the first antenna;
Transmitting means and first receiving means of the first frequency band connected to the duplexer;
A second antenna for receiving radio waves of the first frequency band and a second frequency band different from the first frequency band;
Demultiplexing means for demultiplexing the received signals of the first frequency band and the second frequency band received by the second antenna;
Second receiving means for inputting the received signal of the first frequency band to be demultiplexed by the demultiplexing means;
Third receiving means for inputting the received signal of the second frequency band to be demultiplexed by the demultiplexing means;
Transmission power measurement means for measuring the transmission power of the transmission means;
Selecting means for selecting outputs of the first receiving means and the second receiving means;
Selection control means for controlling the selection means based on a transmission power measurement value by the transmission power measurement means ,
The receiving sensitivity of the receiving system from the first antenna to the first receiving means is lower than the receiving sensitivity of the receiving system from the second antenna to the second receiving means at or above the predetermined transmission power of the transmitting means. Is,
The selection control means uses the predetermined transmission power value as a threshold, and when the transmission power measurement value is less than the threshold based on a comparison between the threshold and the transmission power measurement value, the output of the first reception means And when the transmission power measurement value is equal to or greater than the threshold, the selection unit is controlled to select the output of the second reception unit . The first frequency band is an 800 MHz band or a 2 GHz band,
The wireless communication apparatus according to claim 2 , wherein the second frequency band includes a GPS frequency. The radio communication apparatus according to claim 3 , wherein positioning is performed by alternately executing a transmission / reception operation of radio waves in the first frequency band and an operation of receiving radio waves in the second frequency band. 4. The wireless communication apparatus according to claim 3 , wherein positioning is performed by simultaneously executing transmission / reception operation of radio waves in the first frequency band and reception operation of radio waves in the second frequency band.

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