JP4896805B2 - Mobile phone device and control method - Google Patents

Description

The present invention relates to a mobile phone device and a control method for performing a radio call with a partner via a plurality of base stations in a radio communication network having a plurality of base stations.

  A CDMA (Code Division Multiple Access) type mobile phone device performs handoff for switching a communication channel from a base station in standby (during communication) to another base station as the cell moves. For handoff, before terminating communication with the communicating base station, a soft handoff that starts communication with another base station on the same frequency and a different base station after disconnecting communication with the waiting base station There are hard handoffs that initiate communication with base stations of different groups, different frequency assignments or different frame offsets. These handoffs are disclosed in detail in Patent Document 1 and Patent Document 2.

  Further, the above-described mobile phone device can perform communication with the base station thereafter by performing location registration using one channel. Here, location registration refers to an act of notifying the base station of whereabouts, and periodically searches for a channel in the surrounding frequency band, and if there is a channel with sufficient radio field strength, the channel is temporally searched. This is a paging standby state for synchronization. Therefore, when a high-performance antenna having a relatively high gain is used, particularly according to the base station arrangement (infrastructure) in an urban area, the reception performance may be too good to trigger a handoff.

Many techniques for controlling the reception performance described above have been proposed and filed. For example, in order to improve reception performance during earphone calls, a technique for changing an antenna matching circuit between speaker output and hands-free call (see Patent Document 3), an antenna having a high reception level provided with two antennas in advance. A technique for switching and use (see Patent Document 4), a technique for switching antennas used for voice communication and data communication (see Patent Document 5), and the like are known.
JP 2000-102057 A JP 2001-156752 A JP 2002-152078 A JP 2000-22609 A JP 2004-343577 A

As described above, in a mobile phone device using a high-performance antenna having a relatively high gain, even if it is moving, if the radio field strength of the base station still has sufficient radio field strength, it does not meet the handoff threshold. Therefore, handoff is not executed, but there is a scene that the user wants to handoff originally because the transmission radio wave does not reach.
On the other hand, in the mobile phone device, when the ear is applied to the housing during a call, radio waves are shielded by the human body, and the matching impedance value may shift and the impedance between the antenna and the radio circuit may not match. As a result, there is a conflicting problem that the reception sensitivity of the antenna deteriorates or the transmission output decreases.
Conventionally, there is no technique for dealing with the above two conflicting problems, and each of the above patent documents does not disclose the technique.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a mobile phone device and a control method capable of avoiding an overreach state without adversely affecting a call.

In order to solve the above-described problems, the mobile phone device of the present invention performs wireless communication by switching between a first state with good wireless performance and a second state with inferior wireless performance than the first state. a wireless communication unit, the monitors the reception sensitivity by the wireless communication unit, and a control unit that controls the wireless communication unit to perform Handoo off based on the receiver sensitivity, wherein, the call When an event to be started occurs, it is determined whether the wireless communication unit is in the first state or the second state, and if it is in the first state, the first state is continued to make a call If the event occurs, it is either a hands-free call or a non-hands-free call when the wireless communication unit is switched to the first state . Judge the selected call status If it is determined that the hands-free call has been selected, the call transitions to the call while continuing the first state or the second state, and when the event occurs, the reception sensitivity after the event occurs. And the reception sensitivity before and after the occurrence of the event is compared. If the reception sensitivity is lower than before the occurrence of the event, it is determined that the selected call state is the non-hands-free call .
In addition, the control method of the present invention performs wireless communication by switching between a first state with good wireless performance and a second state with lower wireless performance than the first state, and monitors reception sensitivity. A control method for performing handoff based on the reception sensitivity, and when an event for starting a call occurs, it is determined whether the state is the first state or the second state, and If it is in the first state, the first state is continuously changed to a call, and if it is in the second state, it is switched to the first state and then changed to a call. The call state in which a free call or a non-hands-free call is selected is determined, and when it is determined that the hands-free call is selected, the first state or the second state Switch to a call while continuing When the event occurs, the reception sensitivity after the occurrence of the event is obtained, the reception sensitivity before and after the event occurrence is compared, and if the reception sensitivity is lower than before the event occurrence, the selected call It is determined that the state is the non-hands-free call.

The mobile phone apparatus of the present invention, a good first state radio performance, a wireless communication unit that performs wireless communication by switching and a second state in which poor wireless performance than the first state, the A control unit that monitors reception sensitivity of the wireless communication unit and controls the wireless communication unit to perform handoff based on the reception sensitivity, and the control unit performs handoff around the local station in a standby state. When it is determined that there are a predetermined number or more of possible base stations and a predetermined condition is satisfied based on a signal from a base station that is waiting, the wireless communication unit is set to the second state and handoff is performed. If it is determined that there are no more than a predetermined number of possible base stations or the predetermined condition is not satisfied, the wireless communication unit is set to the first state.
In addition, the control method of the present invention performs wireless communication by switching between a first state with good wireless performance and a second state with lower wireless performance than the first state, and monitors reception sensitivity. And a control method for performing handoff based on the reception sensitivity, and in a standby state, there are a predetermined number or more of base stations that can be handed off in the vicinity of the own station, and a signal from the standby base station If it is determined that the predetermined condition is satisfied, the second state is set. If it is determined that there are no more than a predetermined number of base stations that can be handed off or the predetermined condition is not satisfied. The first state is set.

  Further, in the mobile phone device of the present invention, the wireless communication unit obtains neighboring base station information that is information on neighboring base stations from the base station that is waiting, and the control unit receives the neighboring base station information from the neighboring base station information. You may control to acquire the number of base stations in which handoff is possible.

Further, in the mobile phone device of the present invention, the control unit has a search window for acquiring a signal from the base station that is waiting for reception sensitivity from the base station that is waiting or exceeds a predetermined value. size may be controlled to determine whether the predetermined condition is satisfied by either small squid, at least than the predetermined value.

  In the mobile phone device according to the present invention, when the call is finished, the control unit sets the wireless communication unit to the state selected before the call transition in the first state or the second state. You may control to return.

  Further, in the mobile phone device of the present invention, when the communication unit starts communication, the control unit determines whether it is a call purpose or a data communication purpose, and if it is a call purpose, an event that starts the call is generated. If it is determined and the purpose is data communication, control may be performed so as not to switch the state of the wireless communication unit based on the event.

ADVANTAGE OF THE INVENTION According to this invention, the mobile telephone apparatus and control method which can avoid an overreach state without having a bad influence on a telephone call can be provided.

  FIG. 1 is a block diagram showing an internal configuration of a mobile phone device according to an embodiment of the present invention. As shown in FIG. 1, the mobile phone device 10 includes a wireless communication unit 11, a voice processing unit 12, a control unit 13, a storage unit 14, an operation unit 15, and a display unit 16.

  The wireless communication unit 11 has a function of performing communication with a network including a base station by switching between a first state where the wireless performance is good and a second state where the wireless performance is not better than the first state. For example, as shown in FIG. 2, the antenna 100, an RF (Radio Frequency) filter 111, an RF circuit 112, and a baseband unit 113 (BB) are included.

  The RF filter 111 is a switch for switching one antenna 100 separately for transmission and reception under the control of the control unit 13 described later, and the RF circuit 112 and the BB 13 are a high frequency modulation / demodulation circuit and an amplification circuit.

  The RF circuit 112 and the BB 113 demodulate a signal including sound received via a network including a base station (Rx), or modulate a sound or signal generated by the control unit 13 (Tx), and the RF filter 111. Then, transmission / reception is performed with the network including the base station via the antenna 100. Switching of the antenna 100, amplification (attenuation) control of Tx and Rx in the RF circuit 112, and the like will be described later.

The sound processing unit 12 acquires a sound signal, performs analog / digital conversion, performs signal processing such as encoding, converts the signal into digital sound data, and outputs the digital sound data to the control unit 13.
The audio processing unit 12 performs decoding processing on the audio data output from the control unit 13, performs digital / analog conversion, performs signal processing such as amplification, and outputs the result to the speaker (SP).
In addition to the non-hands-free call using a speaker (SP) and a microphone (MIC, hereinafter referred to as a microphone), the sound processing unit 12 is provided with an earphone microphone jack 17 for performing a hands-free call. The earphone microphone 18 is connected via the via. For this reason, the audio processing unit 12 also performs processing of an audio signal output from the earphone microphone 18 or an input audio signal in a hands-free manner.
That is, the audio processing unit 12 amplifies the audio input via the earphone microphone jack 17, performs analog / digital conversion, further performs signal processing such as encoding, and converts it into digital audio data to control the control unit 13 is output.
The audio processing unit 12 performs signal processing such as decoding, digital / analog conversion, and amplification on the audio data supplied from the control unit 13, converts the audio data into an analog audio signal, and passes through the earphone microphone jack 17. Output to the earphone microphone 18.

In addition, since the user can make a call without holding the mobile phone device by increasing the amplification degree of the speaker (SP) or the microphone (MIC) without using the earphone microphone 18, the voice processing unit 12. Can be realized as a hands-free call by increasing the gain of a speaker (SP) or microphone (MIC) or switching to use a high gain speaker (SP) or microphone (MIC).
Then, the control unit 13 performs such setting of the call state of the hands-free call and the non-hands-free call based on the operation of the operation unit 15 or the connection detection of the earphone microphone 18 to the earphone microphone jack 17.

The control unit 13 has a function of controlling the wireless communication unit 11 to perform handoff based on the received electric field strength of the wireless communication unit. Specifically, when starting a call, the wireless performance of the wireless communication unit 11 is controlled. Is in the first state or the second state, and if it is in the first state, the first state is continued to make a call, and if it is in the second state, the first state Control to switch to a state and transition to a call.
Here, the determination of whether the wireless performance is in the first state or the second state is determined by comparison with a threshold value described later, and the reception performance is relatively good compared to the first state. The second state refers to a state in which reception performance is lower than that in the first state.
As shown in FIG. 1, the control unit 13 has a main control unit 130, a search control unit 131, a handoff processing unit 132, a frequency setting unit 133, and a search window setting unit 134. And a hands-free detection unit 135.

  In addition, when the connection of the earphone microphone 18 to the earphone microphone jack 17 is detected, or when a hands-free call state setting instruction operation to the operation unit 15 is detected, the control unit 13 is in a call state of the voice processing unit 12. Is set to hands-free call, otherwise it is set to non-hands-free call.

The main control unit 130 includes a CPU, a ROM, and a RAM (not shown), and the CPU sequentially reads out and executes a program recorded in the ROM, thereby causing the search control unit 131, the handoff processing unit 132, and the frequency setting unit 133 to be executed. The search window setting unit 134 and the hands-free detection unit 135 are controlled, and as will be described later, there are a predetermined number or more base stations that can be handed off in the vicinity, and the standby base stations are relatively covered. Sequence control is performed as the control unit 13 that executes handoff when a predetermined condition that the cell is a small cell (for example, a micro cell having a copper area of about several hundred meters) is satisfied.
Further, when starting a call, the main control unit 130 determines whether the wireless performance of the wireless communication unit 11 is in the first state or the second state, and if it is in the first state, the first control unit 130 The control unit 13 also executes a function of controlling to switch to the first state if it is in the second state and switch to the first state if it is in the second state.

The search control unit 131 performs a pilot channel search of a neighboring base station during communication and a handoff destination base station at the time of hard handoff. The pilot channel is a signal transmitted continuously by each base station, and the timing of the downlink CDMA channel can be captured by this pilot channel.
Since each base station spreads the pilot channel at different timings according to PN sequences having different periods, the search control unit 131 can identify the base station by identifying the same timing.

Search controller 131 searches for a pilot channel on the current CDMA frequency allocation by pilot search of neighboring base stations, detects the presence of pilot channels of other base stations, and measures the radio field intensity.
Here, when a pilot channel of another base station having sufficient radio field strength is detected, a pilot strength measurement message is transmitted to the communicating base station, and the base station instructs execution of handoff in response thereto. In addition, the search control unit 131 also performs synchronization acquisition of the handoff destination base station by a pilot search of the handoff destination base station at the time of hard handoff.

When the handoff processing unit 132 receives a handoff instruction message from the base station via the main control unit 130, the handoff processing unit 132 controls the frequency setting unit 133 and the search window setting unit 134 to execute handoff.
The handoff processing unit 132 analyzes the handoff instruction message and identifies the handoff type, frequency allocation, pilot PN sequence offset, search window size, and the like. Here, the frequency assignment indicates the frequency assigned to the channel of the handoff destination base station, and is omitted when the handoff type is soft handoff.
In addition, the handoff processing unit 132 controls the wireless communication unit 11 so as to perform frequency conversion in synchronization with the frequency specified via the main control unit 130. The handoff processing unit 132 notifies the search window setting unit 134 of the search window size, the pilot PN sequence offset, and the handoff type.

  Although the search control unit 131 simply measures the radio wave intensity as described above, it may be a signal intensity such as a signal wave-to-interference wave ratio, and it suffices as long as the reception sensitivity and reception quality can be measured.

  The frequency setting unit 133 performs frequency switching control of the wireless communication unit 11 according to the frequency allocation of the handoff destination base station indicated in the handoff instruction analyzed by the handoff processing unit 132, and the search window setting unit 134 performs the handoff processing. Based on the search window size notified from unit 132, the pilot PN sequence offset, and the handoff type, the search control unit 131 is notified of the search window timing during the pilot search.

  The search window setting unit 134 performs pilot search by setting the center of the search window to the pilot PN sequence offset of each neighboring base station during communication.

  The hands-free detection unit 135 has a function of detecting whether or not a hands-free call is being performed when the earphone microphone 18 is attached to the earphone microphone jack 17 and detecting whether or not a hands-free call is being performed. For example, it is possible by monitoring a change in RSSI (Reception Signal Strength) before and after a call.

The storage unit 14 stores various data in addition to the application program executed by the control unit 13. Here, the storage unit 14 stores a reception performance deterioration mode flag (not shown) indicating that the apparatus is waiting in a mode in which reception performance is intentionally deteriorated so as to facilitate handoff.
The storage unit 14 is configured by, for example, a nonvolatile storage device (nonvolatile semiconductor memory, hard disk device, optical disk device, etc.), a randomly accessible storage device (eg, SRAM, DRAM), or the like.

  On the other hand, when a plurality of keys are assigned to the operation unit 15 and these keys are operated (pressed and released) by the user, a signal corresponding to the operation content is generated, and this is used as a user instruction to the control unit 13 is input.

  The display unit 16 is configured using a display device such as a liquid crystal display panel or an organic EL (Electro-Luminescence) panel, for example, and displays an image corresponding to the video signal supplied from the control unit 13. The display unit 16 is, for example, a telephone number of a callee at the time of outgoing call, a telephone number of a callee at the time of incoming call, contents of received mail or outgoing mail, date, time, remaining battery level, success / failure of outgoing call, standby screen, etc. Display information and images.

FIG. 3 and FIG. 4 are flowcharts for explaining the operation that is the premise of the mobile phone device according to the embodiment of the present invention. (FIG. 4A), each of the condition determination processing at the time of transmission (FIG. 4B) is shown.
The operation of the mobile phone device according to the embodiment of the present invention will be described in detail below with reference to the flowcharts shown in FIGS.

In the flowchart of FIG. 3, it is assumed that the mobile phone device 10 is stopped or moving, for example, in a standby state at the base station A, and first determines whether the following condition 1 is satisfied (step S31). .
That is, as shown in FIG. 4A, the control unit 13 (main control unit 130), when power is turned on, when handoff occurs, or when the parameter update of the base station A is performed according to a predetermined cycle, Whether the reception level is greater than the threshold value R (step S311 “Yes”), or transmission is continued (T time) when the transmission power exceeds a certain level (L / M / H) as shown in FIG. 4B. If it is determined (“Yes” in step S312), the condition is set to TRUE (FALSE if not), and the process proceeds to step S32 shown in FIG. Here, the transmission power can be controlled autonomously on the mobile phone device 10 side, but is assumed to be power control led by the base station.

  Next, in step S32, the control unit 13 (main control unit 130) further determines the number of neighboring base stations based on the parameters of the plurality of base stations included in the neighboring base station list issued from the base station A. It is determined whether or not (threshold Y) or more. Here, if the number of neighboring base stations exceeds the threshold Y (step S32 “Yes”), the main control unit 130 further determines that the base station with a relatively small radio wave coverage area (hereinafter referred to as a small cell). It is determined whether or not there is (step S33). Whether or not the cover area is in a relatively small base station can be determined by referring to the search window size of the base station parameter.

  If the search window size is equal to or smaller than the threshold value Z (step S33 “Yes”), the main control unit 130 determines that the coverage area of the currently waiting base station is a small cell, so that handoff is easy. The state of the mobile phone device 10 is switched to (Step S34). In order to switch the state of the mobile phone device 10 so as to facilitate handoff, it is assumed here that the antenna gain is attenuated by hardware.

Specifically, one possible method is to switch the performance of the antenna 100 to be used to an antenna having a normal gain. That is, at the state switching timing shown in FIG. 3 (step S34), for example, the RF filter 111 of the wireless communication unit 11 shown in FIG.
At this time, the control unit 13 (main control unit 130) can change the criterion for handoff by reducing the gain of the antenna under a predetermined condition as compared with a case other than the predetermined condition.

It is also conceivable that the controller 13 attenuates the gain of the high gain antenna by controlling or switching the matching impedance of the high gain antenna. FIG. 5 shows a conceptual diagram of the antenna radiation pattern. In FIG. 5, a radiation pattern indicated by a thick line is a high gain antenna, and a radiation pattern indicated by a thin line is a normal antenna.
Furthermore, it is conceivable to control the gain of the antenna depending on whether or not an attenuator is connected to the antenna terminal of the high gain antenna. In this case, the control unit 13 (main control unit 130) controls the presence or absence of a bypass of an attenuator (not shown) connected to the high gain antenna to reduce the gain of the high gain antenna.

Further, for example, it is conceivable to reduce the gain of an LNA (low noise amplifier) included in Rx of the RF circuit 112.
At this time, the control unit 13 (main control unit 130) reduces the gain of the high gain antenna by adjusting the gain of the LNA that amplifies the received signal from the high gain antenna. FIG. 6 shows an example in which the LNA gain is plotted on the vertical axis, the reception level is scaled on the horizontal axis, and the gain of the LNA is adjusted by the control unit 13 (main control unit 130) stepwise (FIG. 6A). Each example of adjusting the gain of the LNA by control (FIG. 6B) is shown.

  Returning to the flowchart of FIG. 3, as described above, after the antenna gain is attenuated, the handoff processing unit 132 receives a handoff instruction message from the base station via the main control unit 130. 133, the search window setting unit 134 is controlled to execute handoff in the reception quality deterioration mode. Subsequently, the main control unit 130 turns on the reception quality deterioration mode flag assigned to a predetermined area of the storage unit 14 and prepares for an operation described later (step S35).

As described above, by switching the communication state of the mobile phone device so as to facilitate handoff by attenuating the antenna performance (gain), the handoff is repeated in a high energy state. Can be maintained.
On the other hand, when the above-described good handoff control is performed when the wireless performance is good, the wireless performance is deteriorated due to the ear contact at the time of a call as described above. In this case, the mobile phone device 10 originally has When the radio performance cannot be extracted and the radio wave environment deteriorates, the communication quality deteriorates and the call is likely to be interrupted. For this reason, when it is used in a way that affects wireless performance (in this case, the earphone call), it is possible to switch from the above-described reception quality deterioration mode to a state in which the original wireless performance is drawn and to maintain good call quality. It is the gist of the present invention to provide a mobile phone device that can be used. Hereinafter, a detailed description will be given with reference to FIG.

  FIG. 7 is a flowchart showing an example of the operation of the mobile phone device 10 according to the embodiment of the present invention.

  As shown in the flowchart of FIG. 7, for example, when a call is made by a key operation (call / call button) on the operation unit 15 during standby in a state where the wireless performance is lowered (reception quality degradation mode) in an urban area or the like. (Step S701 “Yes”), the control unit 13 (main control unit 130) refers to the content of the call quality degradation mode flag allocated and stored in a predetermined area of the storage unit 14 and intentionally degrades the reception quality. It is determined whether or not (step S702).

  In step S701, the main control unit 130 determines that a call event has occurred not only at the time of a call origination operation but also when it is detected that an incoming call has been notified on the paging channel and an incoming call notification is made (step S701). S701 “Yes”). If it is determined that the communication is data communication when communication is started, it is determined that the event is not a call purpose event (step S701 “Yes”), and the setting state is maintained without performing the process of switching the wireless performance. . Whether the communication is intended for data communication can be determined by the main control unit 130 based on an operation for requesting data communication such as the Internet or a communication request from a mail transmission / reception application.

Here, if the reception quality degradation mode flag is ON (step S702 “Yes”), the main control unit 130 determines that the reception quality is intentionally degraded and is waiting, and further performs voice communication. The output destination of the speaker (SP) in the voice processing unit 12 is determined (step S703). Here, when it is determined that the speaker output is not the output from the earphone microphone 18 and the speaker is applied to the ear instead of the high gain setting for the hands-free operation (step S703 “Yes”), the hands-free detection is performed. The unit 135 compares the difference in RSSI (Received Signal Strength Indicator) before and after the call with a threshold value to determine whether there is a change in RSSI (step S705).
In other words, the RSSI is acquired as needed before the event of the call start process occurs, but RSSI measurement and acquisition are performed again during the call start process to compare the RSSI before and after the event.
Here, when it is determined that there is a change in RSSI (S705 “Yes”), the main control unit 130 switches to the first state before the radio communication unit 11 is controlled to deteriorate the reception performance (step S706). . That is, when the end of the call is detected (step S707 “Yes”), the reception state is deteriorated in reception performance before outgoing / incoming calls, after returning to the high quality reception state before handoff described in step S34 in the flowchart of FIG. The mode is restored (step S708).

On the other hand, if it is determined in step S705 that there is no change in RSSI (step S705 “No”), the call is continued with the reception performance (reception quality degradation mode) as it is (second state). (Step S710), the end of the call is detected (Step S711 “Yes”), and a transition is made to the standby state.
If the reception quality degradation mode flag is set to OFF in the process of step S702 (step S702 “No”), or if it is a hands-free call in the process of step S703 (step S702 “No”), Further, it is determined whether or not there is an incoming call response (step S709). Here, if there is an incoming call response (step S709 “Yes”), the call has been made without any problem, so the call is continued with the reception performance (reception quality degradation mode) as it is (step S710), If there is no incoming response (step S709 “No”), the process shifts to a standby state.

  FIG. 8 is a flowchart showing an example of another operation of the mobile phone device 10 according to the embodiment of the present invention.

  In the flowchart of FIG. 8, the difference from FIG. 7 is that in FIG. 7, the control unit 13 (main control unit 130) measures RSSI only once and determines the presence or absence of the change. Measure three times before communication transition, when there is an incoming call, and during transmission (steps S803, S805, S807), and determine whether there is a change in RSSI before the transition to communication or when there is an incoming call and RSSI at the time of transmission (Step S808) is different. Other operations are the same as those in FIG.

That is, when it is determined that there is a change in RSSI (step S808 “Yes”), the state is switched to a high quality state before the reception performance is degraded (step S809), and the end of the call is detected (step S810 “Yes”). In this case, the reception state is returned to the reception performance deterioration mode state before outgoing / incoming (step S811).
If the reception quality degradation mode flag is set to OFF in step 802 (step S802 “No”), it is further determined whether there is an incoming response (step S812), and if there is an incoming response (step S812). If it is determined that there is no change in the RSSI in the process of step S812 (“Yes” in step S812) or step S808 (step S808 “No”), the call has been performed without any problem, so that reception performance (reception quality degradation mode) ) Is kept as it is (step S813), and when there is no incoming response (step S812 "No"), the state shifts to a standby state.

As described above, according to the mobile phone device 10 according to the embodiment of the present invention, the mobile phone device 10 moves as intended for standby when the wireless performance is good, and therefore, the out-of-service search can be frequently performed. In addition, by performing handoff in small increments, radio waves are not lost, and therefore the possibility of capturing an overreach base station during standby is reduced. In addition, when the wireless performance deteriorates due to the characteristics of the human body due to ear contact etc. during a call during the handoff process described above, the communication quality deteriorates or the call is blocked by extracting the original good wireless performance. It can be avoided and good call quality can be ensured.
Therefore, it is possible to provide the mobile phone device 10 that can avoid the overreach state without adversely affecting the call.

The functions of the constituent blocks included in the mobile phone device 10 according to the embodiment of the present invention shown in FIG. 1 may be realized entirely by software, or at least a part thereof may be realized by hardware. .
For example, data in the wireless communication unit 11, the audio processing unit 12, and the control unit 13 (main control unit 130, search control unit 131, handoff processing unit 132, frequency setting unit 133, search window setting unit 134, hands-free detection unit 135) The processing may be realized on a computer by one or a plurality of programs, and at least a part thereof may be realized by hardware.

It is a block diagram which shows an example of the internal structure of the mobile telephone apparatus which concerns on embodiment of this invention. It is a block diagram which shows an example of an internal structure of the radio | wireless communication part shown in FIG. It is a flowchart which shows the basic operation | movement used as the premise of the mobile telephone apparatus which concerns on embodiment of this invention. It is a detailed flowchart of the condition determination process in FIG. It is a figure which shows the radiation characteristic of the antenna used in the mobile telephone apparatus which concerns on embodiment of this invention. It is the figure which displayed in graph the example of the gain control of LNA used in the mobile telephone apparatus which concerns on embodiment of this invention. It is a flowchart which shows an example of operation | movement of the mobile telephone apparatus which concerns on embodiment of this invention. It is a flowchart which shows an example of other operation | movement of the mobile telephone apparatus which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Mobile phone apparatus, 11 ... Wireless communication part, 12 ... Audio | voice processing part, 13 ... Control part, 14 Memory | storage part, 15 operation part, 16 ... Display part, 17 ... Earphone microphone jack, 18 ... Earphone microphone, 100 ... Antenna , 111 ... RF filter, 112 ... RF circuit, 113 ... Baseband part (BB), 130 ... Main control part, 131 ... Search control part, 132 ... Handoff processing part, 133 ... Frequency setting part, 134 ... Search window setting part 135: Hands-free detection unit.

Claims (8)

A wireless communication unit that performs wireless communication by switching between a first state with good wireless performance and a second state with inferior wireless performance than the first state;
The monitors the reception sensitivity by the wireless communication unit, and a control unit for controlling the wireless communication unit to perform Handoo off based on the receiver sensitivity,
The controller is
When an event for starting a call occurs, it is determined whether the wireless communication unit is in the first state or the second state. If the event is in the first state, the first state is continued. Transition to a call, and if in the second state, transition to the call after switching the wireless communication unit to the first state ,
When the event occurs, a determination is made as to whether a hands-free call or a non-hands-free call is selected, and if it is determined that the hands-free call is selected, the first Transition to a call while continuing the state or the second state,
When the event occurs, the reception sensitivity after the occurrence of the event is obtained, the reception sensitivity before and after the event occurrence is compared, and if the reception sensitivity is lower than before the event occurrence, the selected call A mobile phone device characterized by determining that the state is the non-hands-free call . A wireless communication unit that performs wireless communication by switching between a first state with good wireless performance and a second state with inferior wireless performance than the first state;
A monitoring unit that monitors reception sensitivity of the wireless communication unit and includes a control unit that controls the wireless communication unit to perform handoff based on the reception sensitivity;
The controller is
In the standby state, when it is determined that there are a predetermined number or more of base stations that can be handed off in the vicinity of the own station and a predetermined condition is established based on a signal from the base station that is waiting, the wireless communication unit is Set to the second state, and when it is determined that there are no more than a predetermined number of base stations that can be handed off or the predetermined condition is not satisfied, the wireless communication unit is set to the first state. A mobile phone device. The wireless communication unit obtains neighboring base station information that is information on neighboring base stations from the base station that is waiting,
The mobile telephone device according to claim 2 , wherein the control unit acquires the number of base stations that can be handed off from the neighboring base station information. Wherein, squid smaller than the search window size is a predetermined value for the signal acquisition from the base station in the reception sensitivity or exceeds a predetermined value, or waiting for from the base station in standby, at least The mobile phone device according to claim 2 or 3 , wherein it is determined whether or not the predetermined condition is satisfied. The controller is
When the call is completed, the wireless communication unit, the first state or in the second state, any one of claims 2, characterized in that to return to the state that was selected before the call transition 4 one The mobile phone device according to item. When starting communication, the control unit determines whether the purpose is a call or a data communication. If the purpose is a call, the control unit determines that an event for starting the call is generated. The mobile phone device according to any one of claims 1 to 5 , wherein the state of the wireless communication unit is not switched based on the event. Wireless communication is performed by switching between the first state with good wireless performance and the second state with lower wireless performance than the first state,
Monitors reception sensitivity and controls to perform handoff based on the reception sensitivity.
A control method,
When an event for starting a call occurs, it is determined whether it is in the first state or the second state, and if it is in the first state, the first state is continued to make a call transition. , If in the second state, switch to the first state and then transition to a call,
When the event occurs, it is determined whether the call state is selected as a hands-free call or a non-hands-free call, and when it is determined that the hands-free call is selected, the first Transition to a call while continuing the state or the second state,
When the event occurs, the reception sensitivity after the occurrence of the event is obtained, the reception sensitivity before and after the event occurrence is compared, and if the reception sensitivity is lower than before the event occurrence, the selected call A control method characterized by determining that the state is the non-hands-free call . Wireless communication is performed by switching between the first state with good wireless performance and the second state with lower wireless performance than the first state,
Monitors reception sensitivity and controls to perform handoff based on the reception sensitivity.
A control method,
In the standby state, when it is determined that there are a predetermined number or more of base stations that can be handed off in the vicinity of the own station and a predetermined condition is established based on a signal from the base station that is waiting, the second state is set. A control method is set, wherein when it is determined that there are no more than a predetermined number of base stations that can be handed off, or the predetermined condition is not satisfied , the control method is set to the first state .

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