JP2006270366A - Mobile wireless communication terminal and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the occurrence of communication disconnection and out-of-area display due to nonarrival of a terminal transmission wave to a base station by improving transmission characteristics without increasing the size of an antenna and transmission output. <P>SOLUTION: The mobile wireless communication terminal has a first antenna 8 in common use for transmission/reception, a second antenna 9 exclusive for reception, a matching circuit 12 exclusive for transmission, a matching circuit 13 in common use for transmission/reception, and changeover switches 11, 14 for connecting one of the matching circuits 12, 13 to the first antenna 8. When, for example, an AKC is not returned from the base station corresponding to a positional registration request, a call start message, and a page response message or the like, alternatively, when the transmission quality is deteriorated during a call, a control part 31 compares an RSSI measurement value measured by an RSSI part 32 with a preset RSSI threshold. When the RSSI measurement value is larger than the RSSI threshold (when the received field strength is sufficient), the control part 31 connects the first antenna 8 with the matching circuit 12 exclusive for transmission by controlling the changeover switches 11, 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile radio communication terminal such as a mobile phone terminal equipped with a diversity antenna and a control method thereof.

  Conventionally, in the field of wireless communication, a diversity reception system has been adopted as one of effective methods for fading countermeasures. In particular, in the case of a mobile radio communication terminal such as a mobile phone terminal, the diversity reception method is effective because the propagation path of radio waves changes every moment as the terminal moves.

  Note that, for example, in Japanese Patent Laid-Open No. 2001-156672 (Patent Document 1), after performing a design for matching the first matching circuit of the first antenna for transmission in accordance with the characteristics of the transmission circuit, A transmission / reception circuit is disclosed in which a second matching circuit for compensating antenna characteristics for reception is provided on the receiving circuit side at a position behind a transmission / reception changeover switch so that characteristics can be secured in a wide band. .

  In Japanese Patent Laid-Open No. 2002-314453 (Patent Document 2), a reception band matching circuit is selected when in a standby state, and a reception band matching circuit is selected when a transmission burst is OFF in a communication connection state. An antenna that performs switching so that the transmission band matching circuit is selected when the transmission burst is ON and data communication is being performed in the communication connection state, and the human body matching circuit is selected when the transmission burst is ON and data communication is not being performed in the communication connection state. A mobile phone with a matching circuit switching function is disclosed.

Japanese Patent Laid-Open No. 2001-156672 (FIG. 1) JP 2002-314453 A (FIG. 1)

  By the way, in a mobile radio communication terminal such as a mobile phone terminal, as described above, performing diversity reception is effective for improving reception characteristics. On the other hand, for example, communication disconnection or out-of-service indication under weak electric field conditions occurs not only when the mobile radio communication terminal cannot receive radio waves from the base station, but also the mobile radio communication terminal May be caused by the fact that the transmission wave from the base station does not reach the base station. That is, when the cause of the communication disconnection or out-of-service indication is that the transmission wave from the mobile radio communication terminal does not reach the base station, the diversity reception as described above cannot cope.

  As described above, improvement of transmission characteristics is most effective as a countermeasure for reducing out-of-service display, communication disconnection, and the like due to a transmission wave from a mobile radio communication terminal not reaching the base station. As a method for improving the transmission characteristics, for example, a method of increasing the antenna gain by increasing the antenna, a method of increasing the transmission output, and the like can be considered.

  However, in mobile radio communication terminals such as mobile phone terminals, there is a limit to increasing the antenna size, and there is a problem that power consumption increases when the transmission output is increased.

  The present invention has been proposed in view of such circumstances, and improves transmission characteristics without increasing the antenna size or increasing the transmission output, for example. It is an object of the present invention to provide a mobile radio communication terminal capable of reducing communication disconnection and out-of-service display caused by not reaching a station and a control method thereof.

  A mobile radio communication terminal of the present invention includes a first antenna shared for transmission and reception, a second antenna dedicated for reception, a first matching circuit optimally set for signal transmission using the first antenna, A second matching circuit optimally set for signal transmission and reception using one antenna, connection switching means for connecting one of the first and second matching circuits to the first antenna, and measurement of received signal quality A reception signal quality measuring means that determines whether or not a predetermined response has been sent from the base station corresponding to the predetermined information transmitted to the base station. The received signal quality value is compared with a predetermined threshold value set in advance as a reference value for judging whether the signal quality is good. If the received signal quality value is larger than the predetermined threshold value, the connection switching means is controlled. The first antenna and the first matching circuit Continued Toe, by a control means for causing the signal received using the signal transmission and a second antenna using a first antenna, solving the above problems.

  The mobile radio communication terminal of the present invention includes a first antenna for transmission and reception, a second antenna dedicated to reception, and a first matching circuit optimally set for signal transmission using the first antenna. A second matching circuit optimally set for signal transmission / reception using the first antenna, connection switching means for connecting one of the first and second matching circuits to the first antenna, and received signal quality Received signal quality measuring means, a predetermined transmission quality threshold value that is predetermined as a reference value for determining whether or not the transmission signal quality is good, and the transmission signal quality value of the terminal transmitted from the base station When the transmission signal quality value of the terminal is equal to or lower than the predetermined transmission quality threshold, the predetermined reception quality threshold and the reception signal quality value that are determined in advance as a reference value for determining whether or not the reception signal quality is good And the received signal quality value When it is larger than the predetermined reception quality threshold, the connection switching means is controlled to connect the first antenna and the first matching circuit, so that signal transmission using the first antenna and signal using the second antenna are performed. The above-described problem is solved by including a control unit that performs reception.

  Further, the control method of the present invention includes a first antenna shared for transmission and reception, a second antenna dedicated for reception, a first matching circuit optimally set for signal transmission using the first antenna, And a second matching circuit optimally set for signal transmission / reception using the antenna of the mobile radio communication terminal according to the predetermined information transmitted from the base station in accordance with the predetermined information transmitted to the base station A step of determining whether or not a response has been sent, and a predetermined threshold value set in advance as a reference value for judging whether or not the received signal quality is good when a predetermined response is not sent and reception Comparing the signal quality value, if the received signal quality value is greater than a predetermined threshold, connecting the first antenna and the first matching circuit, and signal transmission using the first antenna; Use second antenna By having the step of causing the signal reception was, to solve the problems described above.

  Further, the control method of the present invention includes a first antenna shared for transmission and reception, a second antenna dedicated for reception, a first matching circuit optimally set for signal transmission using the first antenna, And a second matching circuit optimally set for signal transmission / reception using the antenna of the mobile wireless communication terminal, the control method being predetermined as a reference value for determining whether or not the transmission signal quality is good The received signal quality when the transmission signal quality value of the local terminal is equal to or less than the predetermined transmission quality threshold value A step of comparing a predetermined reception quality threshold value, which is predetermined as a reference value for determining whether or not it is good, with the received signal quality value, and if the received signal quality value is greater than the predetermined reception quality threshold, First antenna and By having the steps of causing a step of connecting the matching circuit, a signal received using the signal transmitted and using the first antenna and the second antenna, to solve the problems described above.

  That is, according to the present invention, a predetermined response is obtained from the base station even though the received signal quality is better than a predetermined threshold value set in advance as a reference value for determining whether or not the received signal quality is good. If the transmission signal quality of the terminal is not good or the reception terminal is poor, there is a possibility that the transmission wave from the terminal does not reach the base station although reception is possible. A matching circuit optimized for transmission is connected to the other antenna to improve the antenna gain in the transmission band.

  In the present invention, when a predetermined response is not obtained from the base station or when the transmission signal quality of the terminal itself is poor, the reception signal quality is better than a predetermined threshold, so that transmission / reception is shared. By connecting a matching circuit optimized for transmission to the first antenna, the transmission characteristics can be improved without increasing the antenna size or increasing the transmission output, for example. Therefore, it is possible to reduce communication disconnection and out-of-service display caused by a transmission wave from the terminal not reaching the base station.

  Hereinafter, an embodiment of a mobile radio communication terminal and a control method thereof according to the present invention will be described with reference to the drawings.

  In the present embodiment, a mobile phone terminal is cited as an example of the present invention. Of course, the contents described here are merely examples, and the present invention is not limited to this example.

[Schematic appearance configuration]
FIG. 1 shows a schematic external configuration of a mobile phone terminal according to an embodiment of the present invention. As shown in FIG. 1, the mobile phone terminal according to the present embodiment includes a first casing 1 and a second casing 2 that can be folded in two so as to be folded with respect to the first casing 1. This is a so-called foldable mobile phone terminal. That is, the first casing 1 and the second casing 2 are pivotally connected to each other by a hinge portion 6 having an axis parallel to each main surface. The telephone terminal can be used in an opened state (hereinafter referred to as an open state) in FIG. 1 and a folded state (hereinafter referred to as a closed state) (not shown).

  The first housing 1 is provided with a display 3 made of liquid crystal or the like, a receiving speaker 5 and the like. Note that the display 3 and the reception speaker 5 are provided on the side that overlaps the second casing 2 (on the side facing the second casing) when in the closed state.

  The second casing 2 contains the main circuit configuration of the mobile phone terminal. In addition, on the upper surface of the second housing 2 (the surface facing the first housing 1 in the closed state), for example, a key for inputting a telephone number, characters, etc., a plurality of function keys, etc. An operation unit 4 composed of the above devices, a microphone 7 for transmission, and the like are provided. Note that the operation unit, the transmission microphone 7, and the like are provided on the surface side that overlaps the first housing 1 in the closed state. In addition, a first antenna 8 and a second antenna 9 used for diversity reception are arranged in the second casing 2 as necessary. In the present embodiment, the first antenna 8 is disposed, for example, in a housing end near the hinge portion 6, and the second antenna 9 is disposed, for example, in a housing end near the transmitting microphone 7. .

[Schematic internal structure]
FIG. 2 shows a schematic internal circuit configuration of the mobile phone terminal according to the embodiment of the present invention. In FIG. 2, only the configuration from the first and second antennas 8 and 9 to the baseband control circuit 30 is shown. Other than the configuration shown in FIG. 2, the circuit configuration of a general mobile phone terminal is not shown and described.

  In FIG. 2, the first antenna 8 is connected to the common terminal of the changeover switch 11. The switched terminal a of the changeover switch 11 is connected to the switched terminal a of the changeover switch 14 via the transmission-only matching circuit 12 which is the first matching circuit of the present invention, and the switched terminal b of the changeover switch 11 is It is connected to the switched terminal b of the changeover switch 14 via the transmission / reception shared matching circuit 13 which is the second matching circuit of the present invention. The common terminal of the changeover switch 14 is connected to the reception circuit 16 and the transmission circuit 17 via the antenna duplexer 15.

  The antenna duplexer 15 is provided to separate the reception signal and the transmission signal of the first antenna 8 that are shared for transmission and reception. The receiving circuit 16 performs processing such as amplification, filtering, and frequency conversion of the received signal separated by the antenna duplexer 15 and outputs the processed received signal to the baseband control circuit 30. The transmission circuit 17 performs processing such as frequency conversion, filtering, and amplification of the transmission signal supplied from the baseband control circuit 30, and outputs the processed transmission signal to the antenna duplexer 15.

  The second antenna 9 is connected to the reception circuit 22 via the reception dedicated matching circuit 21. The receiving circuit 22 performs processing such as amplification, filtering, frequency conversion, and the like of the received signal received by the second antenna 9 and input via the receive-only matching circuit 21, and the received signal after the processing is processed. Output to the baseband control circuit 30.

  The baseband control circuit 30 includes a modulation / demodulation circuit, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), a memory, and the like, and processes such as despreading, decoding, error correction, etc. in the baseband received signal, and baseband Processing such as addition of error correction code, encoding, spreading, etc., and other various control and calculation processes. In the example of FIG. 2, among the components included in the baseband control circuit 30, in particular, the control unit 31 that performs various controls including the switching control of the changeover switches 11 and 14, and the quality of the received signal (specifically Specifically, an RSSI unit 32 that measures a received electric field strength according to an RSSI (Receive Signal Strength Indicator) level is illustrated. The control unit 31 is realized as part of the CPU function, for example, and the RSSI unit 32 is realized as part of the DSP function, for example.

[Control method of mobile phone terminal]
Here, in the mobile phone terminal of the present embodiment, the control unit 31 of the baseband control circuit 30 controls the switching operation of the changeover switch 11 and changeover switch 14 so that the transmission wave from the terminal is transmitted to the base station. It is possible to execute terminal control to reduce communication disconnection and out-of-service display that occur due to not reaching the station.

[Operation after turning on the power]
FIG. 3 shows a flow of terminal control when location registration is performed with respect to the base station after the mobile phone terminal according to the embodiment of the present invention is turned on. Note that the flow in FIG. 3 is mainly processing performed by the control unit 31 of the baseband control circuit 30.

  In FIG. 3, when the mobile phone terminal according to the present embodiment is turned on, the control unit 31 controls the changeover switch 11 to the switched terminal b side and the changeover switch 14 as an initial setting process in step S1. Is switched to the switched terminal b side to set the matching circuit of the first antenna 8 to the transmission / reception shared matching circuit 13 so that transmission / reception is performed by the first antenna 8. At this time, the second antenna 9 is set to an unused state or used for diversity reception as necessary.

  Next, in step S2, the control unit 31 acquires the pilot signal from the base station and establishes synchronization with the base station through communication via the first antenna 8 and the transmission / reception shared matching circuit 13. Determine whether or not.

  If it is determined in step S2 that the pilot signal has not been acquired and the synchronization has not been established (No), the control unit 31 advances the process to step S9 and shifts the state of the mobile phone terminal to the out-of-service standby state. On the other hand, if it is determined in step S2 that the pilot signal has been acquired and synchronization has been established (Yes), the control unit 31 advances the process to step S3.

  When the processing proceeds to step S3, the control unit 31 transmits a location registration request to the base station through communication via the first antenna 8, and then proceeds to step S4.

  In step S4, the control unit 31 determines whether a response (ACK) to the transmission of the location registration request is sent from the base station.

  When it determines with ACK having been sent in the said step S4 (Yes), the control part 31 advances a process to step S10, and makes the state of the said mobile telephone terminal transfer to a zone waiting state. On the other hand, if it is determined in step S4 that ACK has not been sent (No), it is possible that the transmission wave from the mobile phone terminal has not arrived at the base station, although reception is possible. The control unit 31 performs the processing after step S5.

  When the processing proceeds to step S5, the control unit 31 determines in advance the RSSI value measured by the RSSI unit 32 (hereinafter referred to as RSSI measurement value) as a reference value for determining whether the reception status is good. It is determined whether it is greater than a predetermined threshold (hereinafter referred to as RSSI threshold).

  Here, when it is determined in step S5 that the measured RSSI value is equal to or less than the RSSI threshold value (No), it is considered that the ACK cannot be received due to the deterioration of the reception situation. The process proceeds to step S9, and the state of the mobile phone terminal is shifted to the out-of-service standby state.

  On the other hand, if it is determined in step S5 that the measured RSSI value is greater than the RSSI threshold value (Yes), it is considered that the transmission wave from the mobile phone terminal has not reached the base station. Proceeding to S6, the switching switch 11 is controlled to be switched to the switched terminal a side and the switching switch 14 is switched to the switched terminal a side, so that the matching circuit of the first antenna 8 is changed to the transmission-only matching circuit 12. Is set so that transmission is performed by the first antenna 8, and the setting is changed so that reception is performed by the second antenna 9.

  Thereafter, the control unit 31 proceeds to step S7, and again transmits a location registration request to the base station through communication via the first antenna 8 and the transmission-only matching circuit 12, and then proceeds to step S8. Proceed with the process.

  When the processing proceeds to step S8, the control unit 31 has transmitted a response (ACK) to the transmission of the location registration request from the base station through communication via the second antenna 9 and the reception-only matching circuit 21. If it is determined whether or not ACK has been sent (Yes), the process proceeds to step S10, and the state of the mobile phone terminal is shifted to the in-zone waiting state, while ACK is sent. If it is determined that it is not (No), the process proceeds to step S9, and the state of the mobile phone terminal is shifted to the out-of-service waiting state.

  As described above, when the pilot signal is acquired and synchronization is established, and the ACK for the location registration request is not sent from the base station even though the RSSI measurement value is equal to or greater than the predetermined RSSI threshold, reception is not possible. However, there is a possibility that the transmission wave from the terminal does not reach the base station. Therefore, in the mobile phone terminal of this embodiment, the matching circuit of the first antenna 8 is switched to the transmission-only matching circuit 12, and transmission is performed. By improving the antenna gain in the band, it is possible to prevent the transmission wave from being displayed outside the range because it does not reach the base station, and the reception is a second that is originally provided for diversity reception. This is performed by the antenna 9.

  In the mobile phone terminal of the present embodiment, even when the matching circuit of the first antenna 8 is switched to the transmission-only matching circuit 12, reception through the first antenna 8 and the transmission-only matching circuit 12 is possible. Therefore, diversity reception using the first antenna 8 and the second antenna 9 can be performed.

[Operations for outgoing and incoming calls]
FIG. 4 shows the flow of terminal control when making or receiving a call in the mobile phone terminal according to the embodiment of the present invention. Note that the flow of FIG. 4 is processing performed mainly by the control unit 31 of the baseband control circuit 30.

  In FIG. 4, when making or receiving a call at the mobile phone terminal of the embodiment, the control unit 31 controls the changeover switch 11 to the switched terminal b side and controls the changeover switch 14 as an initial setting process in step S20. Is switched to the switched terminal b side to set the matching circuit of the first antenna 8 to the transmission / reception matching circuit 13 so that transmission / reception is performed by the first antenna 8. At this time, the second antenna 9 is set to an unused state or used for diversity reception as necessary.

  Next, in step S21, for example, when a user issues a call instruction operation, the control unit 31 communicates with the base station by communication via the first antenna 8 and the transmission / reception shared matching circuit 13 as processing in step S22. A call start message is sent to the terminal. For example, when a page message is received in step S21, the control unit 31 communicates with the base station through communication via the first antenna 8 and the transmission / reception shared matching circuit 13 as processing in step S22. Send a page response message.

  Next, when the processing proceeds to step S23, the control unit 31 determines whether or not a response (ACK) to the call start message or the page response message is sent from the base station.

  When it determines with ACK having been sent in the said step S23 (Yes), the control part 31 advances a process to step S29, and changes the state of the said mobile telephone terminal to the state at the time of the transmission or reception succeeding. On the other hand, if it is determined in step S23 that an ACK has not been sent (No), it is possible that the transmission wave from the mobile phone terminal has not arrived at the base station, although reception is possible. The control unit 31 performs the processing after step S24.

  In step S24, the control unit 31 determines whether the RSSI measurement value from the RSSI unit 32 is larger than a predetermined RSSI threshold.

  Here, when it is determined (No) that the measured RSSI value is equal to or less than the RSSI threshold value in step S24, it is considered that the ACK cannot be received due to the deterioration of the reception situation. The process proceeds to step S28, and the state of the mobile phone terminal is shifted to the state when the outgoing or incoming call fails.

  On the other hand, if it is determined in step S24 that the measured RSSI value is greater than the RSSI threshold value (Yes), it is considered that the transmission wave from the mobile phone terminal has not reached the base station. Proceeding to S25, the changeover switch 11 is controlled to be switched to the switched terminal a side and the switch 14 is controlled to be switched to the switched terminal a side, whereby the matching circuit of the first antenna 8 is changed to the transmission-only matching circuit 12. Is set so that transmission is performed by the first antenna 8, and the setting is changed so that reception is performed by the second antenna 9.

  Thereafter, the control unit 31 advances the process to step S26, and again transmits a call start message or a page response message to the base station through communication via the first antenna 8 and the transmission-only matching circuit 12. Then, the process proceeds to step S27.

  When the process proceeds to step S27, the control unit 31 transmits a response (ACK) to the transmission of the call start message or the page response message from the base station through communication via the second antenna 9 and the reception-only matching circuit 21. If it is determined whether or not an ACK has been sent (Yes), the process proceeds to step S29 to change the state of the mobile phone terminal to the state when the outgoing or incoming call is successful. On the other hand, if it is determined that the ACK has not been sent (No), the process proceeds to step S28, and the state of the mobile phone terminal is shifted to the state when the transmission or reception fails.

  As described above, after the user has made a call instruction operation or received a page message and sent a call start message or a page response message, the RSSI measurement value is not less than a predetermined RSSI threshold value. When the ACK for the message has not been sent from the base station, it is possible that the transmission wave from the terminal has not arrived at the base station. By switching the matching circuit of one antenna 8 to the transmission-only matching circuit 12 and improving the antenna gain in the transmission band, it is possible to prevent the transmission or reception from failing because the transmission wave does not reach the base station. Thus, reception is performed by the second antenna 9 originally provided for diversity reception. .

[Operation during a call]
FIG. 5 shows a flow of terminal control when, for example, a telephone call is performed in the mobile phone terminal according to the embodiment of the present invention. Note that the flow of FIG. 5 is processing performed mainly by the control unit 31 of the baseband control circuit 30.

  In FIG. 5, when the mobile phone terminal is busy, the base station monitors the quality of the transmission signal from the terminal, and notifies the terminal of the quality of the transmission signal as broadcast information. Therefore, when the mobile phone terminal is in a call, the control unit 31 recognizes the transmission signal quality of the terminal itself based on the notification information from the base station as the process of step S40.

  The control unit 31 that has received the broadcast information serves as a reference value for determining whether or not the transmission signal quality of the terminal itself that is informed from the base station by the broadcast information is good in the transmission status as the process of step S41. It is determined whether or not it is below a predetermined threshold value (hereinafter referred to as a transmission quality threshold value).

  Then, when it is determined in step S41 that the transmission signal quality is lower than the transmission quality threshold value (Yes), the control unit 31 proceeds to the processing from step S42 onward, while the transmission signal quality is determined to be the transmission quality threshold value. If it is determined that it is not lower than (No), the process proceeds to step S46 and subsequent steps.

  When the process proceeds from step S41 to step S42, the control unit 31 determines that the changeover switch 11 is switched to the switched terminal b side and the changeover switch 14 is switched to the switched terminal b side. The matching circuit of the first antenna 8 is changed to the transmission / reception matching circuit 13, and it is determined whether or not the first antenna 8 is set to perform transmission / reception.

  If it is determined in step S42 that the first antenna 8 is not set to perform transmission / reception (No), the control unit 31 advances the process to step S45, and the user has performed an end-of-call instruction operation. If not, the process returns to step S41, and if the user has instructed the end of the call, the call termination process is performed in step S48.

  On the other hand, if it is determined in step S42 that the first antenna 8 is set to perform transmission / reception (Yes), the control unit 31 performs the processing of step S43 as the RSSI from the RSSI unit 32. It is determined whether the measured value is greater than a predetermined RSSI threshold.

  If it is determined in step S43 that the measured RSSI value is equal to or less than the RSSI threshold (No), it is considered that the quality of the received signal has deteriorated and there is no room, so the control unit 31 particularly changes the setting. Control is not performed, and the process proceeds to step S45.

  On the other hand, if it is determined in step S43 that the measured RSSI value is greater than the RSSI threshold (Yes), it is considered that the transmission wave from the mobile phone terminal is difficult to reach the base station. Then, the process proceeds to step S44, and the switching switch 11 is controlled to be switched to the switched terminal a side and the switching switch 14 is switched to the switched terminal a side, so that the matching circuit of the first antenna 8 is matched for transmission only. The circuit 12 is set so that transmission is performed by the first antenna 8, and reception is controlled to be changed by the second antenna 9.

  Further, when the process proceeds from step S41 to step S46, the control unit 31 confirms that the changeover switch 11 has been switched to the switched terminal a side and the changeover switch 14 has been switched to the switched terminal a side. Therefore, the matching circuit of the first antenna 8 is changed to the transmission-only matching circuit 12, and it is determined whether transmission is performed by the first antenna 8 and reception is performed by the second antenna 9. Do.

  If it is determined in step S46 that transmission is performed by the first antenna 8 and reception is performed by the second antenna 9 (Yes), the control unit 31 performs the process of step S47. The switching switch 11 is controlled to be switched to the switched terminal b side and the switching switch 14 is controlled to be switched to the switched terminal b side, whereby the matching circuit of the first antenna 8 is set to the transmission / reception shared matching circuit 13, Transmission / reception is performed by one antenna 8.

  On the other hand, if it is determined in step S46 that transmission is performed by the first antenna 8 and reception is not performed by the second antenna 9 (No), the control unit 31 sets nothing. The process proceeds to step S45 without changing.

  As described above, when the mobile phone terminal of the present embodiment is in a call, the transmission signal quality is below the predetermined transmission quality threshold even though the RSSI measurement value is greater than or equal to the predetermined RSSI threshold. In the mobile phone terminal of this embodiment, the matching circuit of the first antenna 8 is used for transmission-only matching because it is possible that the transmission wave from the terminal is difficult to reach the base station. By switching to the circuit 12 and improving the antenna gain in the transmission band, it is possible to prevent the call from being cut off because the transmission wave is difficult to reach the base station. The second antenna 9 provided in is used.

[Example of adding hysteresis to the switching operation during a call]
By the way, when the mobile phone terminal is busy, it is not preferable to frequently switch the matching circuit of the first antenna 8. For this reason, the mobile phone terminal according to the present embodiment has an appropriate hysteresis in determining whether to switch the matching circuit of the first antenna 8 so that the matching circuit is switched more frequently than necessary. It is also possible not to do it.

  In FIG. 6, in the terminal control when the mobile phone terminal according to the embodiment of the present invention makes a call, for example, the switching determination of the matching circuit of the first antenna 8 is provided with hysteresis by counting for a certain time. The flow when doing so is shown. In the flowchart of FIG. 6, the same steps as those in the flowchart of FIG. 5 are denoted by the same reference numerals, and description thereof is omitted.

  In the flowchart of FIG. 6, after the process of step S44 or after the process of step S47, the control unit 31 advances the process to step S51. When the process proceeds to step S51, the control unit 31 waits for a predetermined time to elapse and advances the process to step S45 after the predetermined time elapses.

  As described above, according to the process of the flowchart of FIG. 6, after the process of step S44 or step S47, the transition to the next process is stopped for a predetermined time, and the comparison determination of the transmission signal quality and the transmission quality threshold or the RSSI measurement are performed. By extending (delaying) the timing at which the comparison determination between the value and the RSSI threshold is performed, it is possible to make it difficult for the matching circuit of the first antenna 8 to be frequently switched.

  Further, as another example of providing an appropriate hysteresis for determining whether to switch the matching circuit of the first antenna 8, the process of the flowchart shown in FIG.

  In the flowchart of FIG. 7, the same steps as those in the flowchart of FIG. 5 are denoted by the same reference numerals, and description thereof is omitted.

  In the case of the flowchart of FIG. 7, the control unit 31 advances the process to step S52 after the process of step S44, and advances the process to step S45 after increasing (increasing) the RSSI threshold to a value one rank higher. In addition, after the process of step S47, the control unit 31 advances the process to step S53, and after returning the RSSI threshold to the initial value, advances the process to step S45.

  As described above, according to the process of the flowchart of FIG. 7, the transition from step S43 to step S44 is less likely to occur by raising the RSSI threshold to a value one rank higher after the process of step S44. It is possible to prevent the matching circuit of the antenna 8 from being frequently switched. On the other hand, by returning the RSSI threshold value to the initial value in step S53 after the process of step S47, the RSSI threshold value changed in step S52 can be restored.

[Other examples of schematic internal configuration]
FIG. 8 shows a schematic internal circuit configuration of a mobile phone terminal according to another embodiment. In FIG. 8, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the example of FIG. 8, a changeover switch 18 is provided between the changeover switch 14 and the antenna duplexer 15, and an open / close switch 19 is provided between the transmission circuit 17 and the antenna duplexer 15. The common terminal of the changeover switch 18 is connected to the common terminal of the changeover switch 14, the switched terminal b of the changeover switch 18 is connected to the antenna duplexer 15, and the switched terminal a of the changeover switch 18 is connected to the transmission circuit 17. ing. The switch 18 and the open / close switch 19 are controlled by the control unit 31. When the switch terminal 11 is selected by the switch 11 and 14, the switch 18 is switched. When the terminal b is selected and the open / close switch 19 is closed, and the switchable terminal a is selected by both the changeover switches 11 and 14, the switchable terminal a of the switch 18 is selected and the open / close switch 19 is established.

  That is, in the configuration shown in FIG. 8, when the matching circuit of the first antenna 8 is set to the transmission / reception shared matching circuit 13, the transmission / reception shared matching circuit 13 and the antenna duplexer 15 are connected. When the antenna duplexer 15 and the transmission circuit 17 are connected, and the matching circuit of the first antenna 8 is set to the transmission dedicated matching circuit 12, the antenna duplexer 15 is not used. The transmission dedicated matching circuit 12 and the transmission circuit 17 are connected.

  As a result, according to the configuration of FIG. 8, when the first antenna 8 is connected to the transmission-only matching circuit 12 and is mainly used only for transmission, transmission loss due to the antenna duplexer 15 is eliminated and transmission is performed. The gain in the band can be improved.

[Summary]
As described above, according to the mobile phone terminal of the present embodiment, the first antenna 8 that can be used for both transmission and reception, and the second antenna 9 for performing diversity reception together with the first antenna 8, The matching circuit of the first antenna 8 is switched to a matching circuit (transmission dedicated matching circuit 12) optimized for the transmission band, if necessary, and the first antenna 8 is used as a transmission dedicated antenna. However, reception is performed by the second antenna 9 to improve the gain of the transmission antenna and reduce the frequency of call disconnection and out-of-service indication caused by transmission wave non-delivery under weak electric field conditions. Is possible.

  The description of each embodiment described above is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made according to the design or the like as long as the technical idea according to the present invention is not deviated.

  In the above-described embodiment, RSSI is used to know the reception quality. However, for example, a bit error rate (BER) at the time of data communication between the mobile phone terminal and the base station may be used.

  The mobile wireless communication terminal of the present invention is not limited to a mobile phone terminal, and is a PDA device (PDA: Personal Digital Assistants), a notebook personal computer, a portable electronic game device, a car navigation device having a wireless communication function. The present invention can also be applied.

1 is an external view illustrating a schematic external configuration of a mobile phone terminal according to an embodiment of the present invention. It is a block diagram which shows the schematic internal circuit structure of the principal part of the mobile telephone terminal of this invention embodiment. It is a flowchart which shows the flow of terminal control at the time of performing position registration with respect to a base station, after powering on the mobile telephone terminal of this invention embodiment. It is a flowchart which shows the flow of the terminal control at the time of performing transmission and reception in the mobile phone terminal of the present invention. It is a flowchart which shows the flow of terminal control when the telephone call is performed in the mobile telephone terminal of this invention embodiment. It is a flowchart which shows the flow at the time of giving a hysteresis by a fixed time count for the switching determination of the matching circuit of a 1st antenna in terminal control when the telephone call is performed. It is a flowchart which shows the flow at the time of giving a hysteresis by changing an RSSI threshold value in switching judgment of the matching circuit of the first antenna in the terminal control when a call is being made. FIG. 5 is a block diagram showing a schematic internal circuit configuration of a main part when the antenna duplexer is passed when the transmission dedicated matching circuit is set in the mobile phone terminal of the embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st housing | casing, 2nd housing | casing, 3 display, 4 operation part, 5 receiving speaker, 6 hinge part, 7 microphone for transmitting, 8 1st antenna, 9 2nd antenna, 11, 14, 18 changeover switch, 12 transmission dedicated matching circuit, 13 transmission / reception shared matching circuit, 15 antenna duplexer, 16, 22 reception circuit, 17 transmission circuit, 19 open / close switch, 21 reception dedicated matching circuit, 30 baseband control circuit, 31 Control unit, 32 RSSI unit

Claims (12)

A first antenna for both transmission and reception;
A second antenna dedicated to reception;
A first matching circuit optimally set for signal transmission using the first antenna;
A second matching circuit optimally set for signal transmission and reception using the first antenna;
Connection switching means for connecting one of the first matching circuit and the second matching circuit to the first antenna;
Received signal quality measuring means for measuring received signal quality;
In response to the predetermined information transmitted to the base station, it is determined whether or not a predetermined response is sent from the base station. If the predetermined response is not sent, whether or not the received signal quality is good A predetermined threshold value set in advance as a reference value for judging the received signal quality value measured by the received signal quality measuring means, and if the received signal quality value is larger than the predetermined threshold value, Control means for controlling connection switching means to connect the first antenna and the first matching circuit to perform signal transmission using the first antenna and signal reception using the second antenna; A mobile radio communication terminal characterized by comprising: The mobile radio communication terminal according to claim 1,
The control means transmits a location registration request to the base station, and compares the predetermined threshold with the received signal quality value when a response corresponding to the location registration request is not sent from the base station. A mobile radio communication terminal. The mobile radio communication terminal according to claim 2,
The control means performs control for connecting the first antenna and the first matching circuit, retransmits a location registration request to the base station, and receives a response corresponding to the retransmitted location registration request. A mobile radio communication terminal that performs predetermined out-of-service processing when not sent from the base station. The mobile radio communication terminal according to claim 1,
The control means transmits a communication start message or a page response message to the base station, and when a response corresponding to the communication start message or the page response message is not sent from the base station, the predetermined threshold and the A mobile radio communication terminal characterized by comparing with a received signal quality value. The mobile radio communication terminal according to claim 4, wherein
The control means performs control for connecting the first antenna and the first matching circuit, then retransmits a communication start message or a page response message to the base station, and transmits the retransmitted communication start message or A mobile radio communication terminal characterized in that when a response corresponding to a page response message is not sent from the base station, a predetermined communication failure process is performed. A first antenna for both transmission and reception;
A second antenna dedicated to reception;
A first matching circuit optimally set for signal transmission using the first antenna;
A second matching circuit optimally set for signal transmission and reception using the first antenna;
Connection switching means for connecting one of the first matching circuit and the second matching circuit to the first antenna;
Received signal quality measuring means for measuring received signal quality;
A comparison is made between a predetermined transmission quality threshold predetermined as a reference value for determining whether or not the transmission signal quality is good and the transmission signal quality value of the terminal transmitted from the base station, and the transmission of the terminal When the signal quality value is equal to or lower than the predetermined transmission quality threshold, a predetermined reception quality threshold predetermined as a reference value for determining whether or not the reception signal quality is good and the reception signal measured by the reception signal quality measuring means When the received signal quality value is greater than the predetermined reception quality threshold, the connection switching means is controlled to connect the first antenna and the first matching circuit, and A mobile radio communication terminal characterized by comprising control means for performing signal transmission using a first antenna and signal reception using the second antenna. The mobile radio communication terminal according to claim 6,
The control means controls the connection switching means to connect the first antenna and the second matching circuit when the transmission signal quality value of the terminal is larger than the predetermined transmission quality threshold, and A mobile radio communication terminal characterized in that signal transmission / reception using one antenna and signal reception using the second antenna are performed. The mobile radio communication terminal according to claim 6,
The mobile radio communication terminal characterized in that the control means stops the comparison process until a predetermined time elapses after performing control for connecting the first antenna and the first matching circuit. The mobile radio communication terminal according to claim 6,
The mobile radio communication terminal characterized in that the control means increases the predetermined reception quality threshold by a predetermined value after performing control to connect the first antenna and the first matching circuit. The mobile radio communication terminal according to claim 7,
The control means increases the predetermined reception quality threshold by a predetermined value after performing control for connecting the first antenna and the first matching circuit, and controls the first antenna and the second antenna. A mobile radio communication terminal characterized by setting the predetermined reception quality threshold value to an initial value after performing control for connecting a matching circuit. First antenna for transmission / reception, second antenna dedicated for reception, first matching circuit optimally set for signal transmission using the first antenna, and signal transmission / reception using the first antenna And a second matching circuit optimally set to the control method of the mobile radio communication terminal,
Determining whether a predetermined response has been sent from the base station corresponding to the predetermined information transmitted to the base station;
When the predetermined response is not sent, a step of comparing a predetermined threshold value preset as a reference value for determining whether or not the received signal quality is good with the measured received signal quality value;
Connecting the first antenna and the first matching circuit if the received signal quality value is greater than the predetermined threshold;
A method for controlling a mobile radio communication terminal, comprising: performing signal transmission using the first antenna and signal reception using the second antenna. First antenna for transmission / reception, second antenna dedicated for reception, first matching circuit optimally set for signal transmission using the first antenna, and signal transmission / reception using the first antenna And a second matching circuit optimally set to the control method of the mobile radio communication terminal,
A step of comparing a predetermined transmission quality threshold predetermined as a reference value for determining whether or not the transmission signal quality is good and a transmission signal quality value of the terminal transmitted from the base station;
When the transmission signal quality value of the terminal itself is equal to or lower than the predetermined transmission quality threshold, a predetermined reception quality threshold that is determined in advance as a reference value for determining whether the reception signal quality is good or not is measured. And a step of comparing
Connecting the first antenna and the first matching circuit if the received signal quality value is greater than the predetermined received quality threshold;
A method for controlling a mobile radio communication terminal, comprising: performing signal transmission using the first antenna and signal reception using the second antenna.

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