JPH09271057A - Re-communication method and portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute re-communication early or to inhibit re-communication by detecting a level of other network during communication using one network so as to control the re-communication by the other network. SOLUTION: A changeover circuit 14 gives three kinds of reception carrier outputs from 1st-3rd PLL circuits 8-10 to a 1st down-converter 7 synchronously with the time division operation. As a result, a frequency conversion output is obtained, the down-converted output is fed to a 2nd down converter 13, in which the frequency is converted into an IF frequency and fed to a demodulation circuit 14 and a level detection circuit 19. Then a control circuit 30 receiving an output of the level detection circuit 19 discriminates whether or not re- communication is available by using other network at a communication location at present by receiving a carrier of other service company not in use and detecting its electric field strength. When the level of the network during communication is a prescribed level or below and the level of the other network is a prescribed level or over, the re-communication is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a re-communication method for a mobile phone and a mobile phone that can be connected to a plurality of different types of networks.

[0002]

2. Description of the Related Art Conventionally, a cellular phone connection service cannot be provided to networks of different types such as competing telephone service companies and systems. That is, the NTT (registered trademark) mobile phone could not make a call through the DDI (registered trademark) service network. Such inconvenience
Just as DI also undertakes the connection service of NTT's mobile phone, it will be solved if the connection service such as roaming is performed on the service network side, but there is a plan that all telephone service companies will provide such contracted connection service. Absent.

Therefore, by improving one mobile phone side,
It is necessary to connect to the networks of a plurality of telephone service companies and to support the terminal side by subscribing to a plurality of telephone service companies. However, a technique related to a mobile phone that can be connected to a plurality of types of service networks in this way is known.

For example, Japanese Unexamined Patent Publication No. 4-137962 and Japanese Unexamined Patent Publication No. 4-242353 disclose a technique of connecting to a service network whose service charge is low. Further, in Japanese Unexamined Patent Publication No. 6-252837, the moving speed of a mobile phone is detected to detect a cellular service network and P
A technique for selecting an HS service network is disclosed.

[0005]

However, when the mobile phone moves and the communication is interrupted by being disconnected from the service network being connected, various problems occur during re-communication.
For example, appropriate re-communication cannot be controlled unless the communication quality or electrolytic strength of the service network scheduled for re-communication is known during communication.

When making a call by itself for re-communication, the call cannot be made unless the telephone number of the other party is known. Furthermore, when making a call to the other party, the other party cannot make a call unless the telephone number of the service network with which communication is possible is known. The above-mentioned conventional technology does not suggest any solution to the problem regarding the re-communication.

[0007] Therefore, the present invention proposes a method for solving the above-mentioned problems associated with re-communication and a mobile phone.

[0008]

SUMMARY OF THE INVENTION The present invention is an invention relating to a re-communication method, and in a re-communication method for a portable telephone capable of communicating with a plurality of networks, while the communication using one network is performed while the other By detecting the level of the network and controlling the re-communication by the other network, the re-communication is executed earlier depending on the state of the other network during communication, or vice versa. To be done.

Further, according to the present invention, in the above-mentioned re-communication method, re-communication is executed when the network in communication is below a predetermined level and the other network is above a predetermined level. As a result, when a call becomes difficult during a call, it is determined that the level of the other network is callable, and the re-communication state is set. In addition, the present invention provides the above-mentioned re-communication method,
By performing re-communication when the level of the other network is higher than the level during communication, communication is executed at the higher level.

Further, according to the present invention, in the above communication method, in addition to the relative level comparison, when the level of the network being communicated is below a predetermined level, re-communication is executed. As long as proper communication is possible, useless re-communication operation is prevented. Further, according to the present invention, in the above-mentioned re-communication method, when the other network is below a predetermined level, the re-communication is limited so that the communication by the other network is difficult. Communication is continued as it is as long as the current communication is possible, and re-communication is not performed.

Further, in the above-mentioned re-communication method, the present invention transmits the telephone number information of the other network to the other party before the re-communication,
By transmitting a call request signal to the other party during re-communication, the re-communication is initiated by the other party.
In the re-communication method, the present invention stores the telephone number information of the other party before the re-communication, and calls the other party during the re-communication via the other network. Call yourself when re-communication.

Further, according to the present invention, in the above-mentioned re-communication method, the call at the time of re-communication is automatically made after the interruption of the communication, thereby inputting a telephone number or the like. A call for re-communication is made without any operation. Also, the present invention is characterized in that, in the above-mentioned re-communication method, the re-communication after the communication by the calling is made by making a call by redialing, so that the existing telephone number information of the other party is not required. Re-communicate using the function of.

Further, according to the present invention, in the above-mentioned re-communication method, since the re-communication is originated, the telephone number information of the other party is stored in advance at the time of the incoming call. The outgoing call is executed without requesting again. Also,
In the re-communication method described above, the present invention is characterized by displaying that a call is being made by re-communication, thereby informing the user of the operation after communication interruption.

On the other hand, the present invention relates to a mobile telephone, and controls the re-communication by comparing the output of the level detecting means for detecting the electric field strength or communication quality of each available network with the output of the detecting means. By providing the means, the re-communication and the re-communication are restricted. Also,
According to the present invention, in the above-mentioned mobile phone, the control means has an absolute comparison means for comparing each detection level of the detection means with an absolute value. Maintained communication is maintained.

Further, according to the present invention, in the above-mentioned portable telephone, the control means has a relative comparison means for relatively comparing the output levels of the both detection means, so that a good communication state is always maintained. Communication is performed by selecting a network. Further, the present invention is the above mobile phone, wherein the control means is
By limiting the re-communication based on the output of the absolute comparison means, the re-communication is limited when the other network is difficult to communicate.

Further, the present invention is characterized in that, in the above-mentioned portable telephone, the control means executes re-communication based on the output of the absolute comparison means and / or the relative comparison means, so that the level is always maintained. Re-communication is performed when communication is performed using a high network or when the current communication state deteriorates. Further, the present invention is characterized in that the above-mentioned mobile phone has a calling means for making a call to the other party via the other network after the communication interruption of one network, whereby the re-communication is performed by itself. Will be executed.

Further, the present invention is characterized in that the above-mentioned portable telephone has call requesting means for requesting the caller to make a call through the other network during the communication for the re-communication. By doing so, communication is executed at the expense of the other party. Further, the present invention is characterized in that, in the above-mentioned mobile phone, the other party has a number information transmitting means for transmitting the telephone number information of the other network, so that the other party can use the available network. Make a call through.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. First, in the first embodiment, the present invention is applied to a mobile phone called PDC. As shown in FIG. 2, the present embodiment enables re-communication between three types of networks in the 1.5 GHz band in which services are provided as PDCs. A company, B company, C Among the carriers of the channels assigned to the company, the carriers of the channels that are not used for communication are sequentially received, and the possibility of re-communication is determined.

As shown in FIG. 3, the PDC receives and sends data at 1/3 the transmission / reception data in units of 50 msec.
Utilizing that time axis compression is performed and time division multiplexing is used,
A carrier of an unused channel is received at timings of two phases (second phase and third phase in the present embodiment) remaining in time division, and its electrolytic strength (carrier reception strength) level or communication quality (received control). Data error rate) level is detected to judge whether or not re-communication is possible, and re-communication is controlled (whether to actively re-communicate or to continue communication until communication service is interrupted and restrict re-communication). Is.

With respect to the hardware relating to the signal processing of the PDC of this embodiment, the signal processing operation of reception and transmission will be described below with reference to the circuit block diagram of FIG. First, at the time of reception, the electric wave obtained from the rod antenna 1 is passed through the duplexer 2 to the first low noise amplifier 3
It is supplied to and amplified. On the other hand, the radio wave obtained from the plane antenna 5 built in the mobile phone is amplified by the second low noise amplifier 6. The amplified output is selected by the selection switch 4 as the output having the higher electric field strength level.
The control of the selection switch 4 is a well-known technique adopted in the conventional apparatus and has no direct relation to the present invention, and therefore detailed description thereof will be omitted.

The reception output selected after amplification is frequency-converted to a predetermined frequency by the first down converter 7. The reception carrier of the PLL circuit is used for this frequency conversion. The frequency is sequentially switched in synchronization with the previous time division operation for communication and watching. This switching operation is a feature of the hardware of this embodiment.

In order to switch this reception carrier frequency,
First, in the present embodiment, a first PLL circuit 8 for company A, a second PLL circuit 9 for company B, and a third PLL circuit 10 for company C are provided to receive carriers within the band used by the respective telephone service companies. 3 types of reception carriers are generated. Each of the PLL circuits generates a plurality of reception carriers designated by the base station according to the control output of the control circuit 30, but if the PLL circuits have a wide oscillation frequency band and a high response speed, each telephone service company PL
It is not necessary to provide an L circuit, and it is possible to sufficiently configure one PLL circuit.

The three types of reception carrier outputs are supplied to the switching circuit 11. The switching circuit 11 supplies three types of reception carriers to the first down converter 7 in synchronization with the time division operation of communication. As a result, a frequency conversion output is obtained from the first down converter. The down-converted output is supplied to the second down converter 13,
Converted to IF frequency. The reception carrier of the fourth PLL circuit 12 is used for the frequency conversion to the IF frequency. The IF output obtained from the second down converter is supplied to the demodulation circuit 14 and the level detection circuit 19.

The level detecting circuit 19 is originally used for detecting the electrolytic strength of radio waves obtained from two types of antennas and utilizing the antenna output having the larger electrolytic strength. At the same time, of the carriers in the band used by the company A in communication, the received electrolytic strength level for the carrier frequency specified by the base station in communication is detected by using the second phase or the third phase, It is also possible to transmit the detection level to the base station as control data via the control circuit 30.

Furthermore, what is important in the present invention is that the output of the level detection circuit 19 receives a carrier of another service company which is not in use and detects the electric field strength of the carrier so that the control circuit 30 can detect the electric field strength. , Is characterized by determining whether or not re-communication is possible using another network at the current communication location. On the other hand, the IF output input to the demodulation circuit 14 is QPSK demodulated in the demodulation circuit 14 to be subjected to TDM.
It is input to the A circuit 15 and divided into voice data and control data.

The control data consists of various data generated by the base station and the telephone of the other party, and is supplied to the control circuit 30 and the error rate detection circuit 20. The error rate detection circuit 20 is
In order to evaluate the communication quality, the error rate of the control data is measured and detected, and the result is supplied to the control circuit 30. Also, VS
The audio data compressed by ELP or PSI-CERP is input to the decoding circuit 16, is decoded, and is returned to normal audio data. This voice data is
The DA conversion circuit 17 converts the analog audio signal and supplies it to the speaker 18.

The receiving circuit described above is intermittently driven with a duty of 1/3 at a cycle of almost 50 Hz and is driven with the first phase thereof. However, the level of the carrier designated by the base station is watched and the antenna on the unused side is used. In order to watch the electric field strength level in the case of passing through, the drive state is set at the rate of about once per second at the timing of the second phase or the third phase. In addition, in the present invention, in order to detect the error rate of the electric field strength level of another network or the control code, the drive state is set at a rate of about once per second at the timing of the second phase or the third phase.

On the other hand, on the transmitting side, voice is received by the microphone 21, digitized by the AD conversion circuit 22, and converted by the encoding circuit 23 into VSELP or PSI-CERP compressed voice data. This compressed audio data is formed in the TDMA circuit 15 together with the control data obtained from the control circuit 30, time-axis compressed at the timing of the first phase and supplied to the differential encoding circuit 24 to be divided into I signal and Q signal. Is input to the quadrature modulation circuit 25, and the fourth
Quadrature modulation is performed by the transmission carrier emitted by the PLL circuit 12.

The quadrature-modulated transmission data is input to the up converter 26, frequency-converted by the transmission carrier generated by the switching circuit 11, and converted into a transmission signal.
The frequency of this transmission carrier is set to 48 MHz higher than that of the reception carrier, and the transmission frequency is set to be lower than the reception frequency. The transmission signal is further amplified by the preamplifier 27, the AGC amplifier 28, and the power amplifier 29, supplied to the duplexer 2 and output from the rod antenna 1.

In the present embodiment, the above-mentioned transmission circuit is driven intermittently only in the first phase as in the conventional case, and the received electric field strength level data and the error rate level data of the control data are transmitted as the control data in the conventional manner. It transmits to the inside base station. Further, the transmission circuit uses, as data peculiar to the present invention, a call-out command for re-communication formed by the control circuit 30, own telephone number information for a communicable network, and telephone number information of the other party. The transmission request command is transmitted to the other party.

In this embodiment, as for transmission, only the first phase is driven as in the conventional case. Hereinafter, the control circuit 30 for controlling the operation of each circuit of the mobile phone will be described focusing on the control operation for re-communication, which is a feature of the present invention. FIG. 4 is a chart in which the current communication state and the schedule of re-communication are divided into cases, and before (or during) communication for four types of cases.
5 is a chart specifying the operation of the above and the operation of re-communication. That is, FIG. 4 shows a case where the current communication is a call (upper row) and a call is received (lower row), a self-call is made during re-communication (left column), and a case where the other party is called (right column). Each operation of is shown.

First, when a call is made by himself and a call is made again for re-communication, no operation is performed during communication and at the time of re-communication, redialing is performed through an available network. In addition, when making a call by itself and making a call to the other party during re-communication, the other party's telephone number data registered in two types of unused networks are transmitted in advance during communication, and the , Specify an available network and issue a call command.

Further, when the communication is due to an incoming call from the other party and a call is made at the time of re-communication, the telephone number of the other party is stored at the time of the incoming call, or by requesting the telephone number information to the other party during the communication, The other party's telephone number data is stored, and upon re-communication, redial is made via an available network.
Furthermore, if the communication is due to an incoming call from the other party and the other party is called at the time of re-communication, the telephone number data of one's own registered in the two types of networks that are not in use by the other party during the communication are previously set. After the transmission, the available network is designated and a call command is issued at the time of re-communication.

The telephone number information transmitted to the other party can be automatically called or displayed by being displayed on the display unit of the other party's telephone or being stored in the other party's telephone. Looking at it, it is assumed that it is configured so that a call can be made easily. Further, the telephone number information obtained from the other party is stored in the memory and automatically called upon re-communication.

The operation of the control circuit 30 will now be described with reference to the determination of whether re-communication by the networks of B and C is possible and the control of re-communication when communication is being performed by the network of company A. 6 and the flowchart shown in FIG. Incidentally, FIG.
Shows a flowchart of the operation at the initial stage of communication, and FIG.
It is a figure which shows the flowchart of a re-call operation during a call and after that.

In the flowcharts shown in FIGS. 5 and 6, the electric field strength level is used for the determination of re-communication, but the same operation is performed even if the error rate level of the reception control data is used for the determination, and both are equivalent. The data. First, as shown in FIG. 5, the system waits in the state of waiting for incoming call S1 or waiting for outgoing call S2. When an incoming call is received, it is determined in S3 whether a call is scheduled to be made by re-communication. The schedule is preset by the user.

If the call is scheduled, it is checked whether or not the telephone number of the other party has been read S4. If the result of the check is that it has not been read, the telephone number information is requested from the other party (S5). On the other hand, if the other party is going to make a call at the time of re-communication, the telephone number data registered in the unused company B is transmitted S6. Then, S7 which transmits the telephone number data registered with C company.

When a call is made, it is checked in S8 whether or not the call is scheduled to be made by re-communication. If you plan to make a call,
There is no special operation because you only need to redial.
However, if the other party is to make a call at the time of re-communication, the telephone number data registered in the unused company B is transmitted S6. Then, S7 which transmits the telephone number data registered with C company.

The above-mentioned operation is executed at the initial stage of incoming or outgoing call, and the operation shown in FIG. 6 is executed during communication and during re-communication. In the present embodiment, a reference value LS that is considered to be communicable is set in advance, and whether communication is possible or not is determined based on this reference value LS. First, S9 of reading the setting reference value LS. Next, S10 of reading the electric field strength level LA of the company A during communication.

Further, the electric field strength level LB of the unused company B
Read S11. Furthermore, the field strength level LC of the unused company C is read S12. In this state, it is checked whether the electric field strength level LA during communication is equal to or higher than the reference value LS S13. As long as it is equal to or higher than the reference value, each electric field strength level is continuously updated and the standby state is maintained.

When it is determined that the value is less than the reference value, that is, the communication quality is deteriorated, it is checked whether the electric field strength level LB of the company B or the electric field strength level LC of the company C is larger S1.
4. If the electric field strength level LB of the company B is large, then it is checked S15 whether or not the level LB is smaller than the reference value LS. If the electric field strength level LB is large, it is determined that re-communication is possible, and it is determined whether or not a call was scheduled during re-communication S16.

If the call is scheduled, the communication is interrupted by itself and a call for re-communication is made in S17. If the calling instruction is scheduled, an instruction for designating the number of company B is issued to the other party S1
8. After that, in step S19, a call is issued to the other party. On the other hand, C
If the electric field strength level LC of the company is large, then it is checked whether or not this level LC is smaller than the reference value LS S
20.

If the electric field strength level LC is large, it is judged that re-communication is possible, and it is judged at S21 whether or not a call was scheduled to be made at the time of re-communication. If the call is scheduled, the communication is interrupted by itself and a call for re-communication is made in S22. If the calling instruction is scheduled, an instruction to specify the number of company C is issued to the other party S2
3. Then, S24 in which a call is issued to the other party.

Further, even if the larger electric field strength level is below the reference level LS, it is considered that re-communication by another network is difficult, and communication is continued until the current communication is cut off on the network side. , And prohibit or limit re-communication. The above-described embodiment has been described by taking as an example the case where connection to three networks is possible, but the same control is also possible when connection to two networks of company A and company B is possible. Is.

FIG. 7 shows that B is in communication during communication using company A's network.
The operation of the control circuit 30 that determines whether or not communication through the company network is possible and controls re-communication is expressed as a functional block diagram, and re-communication is determined only by absolute comparison. First, the electric field strength levels of the two types of networks that are time-divisionally supplied from the level detection circuit 19 are input to the first electric field strength level latch means 31 and the second electric field strength level latch means 32. As a result, in the first electric field strength level latching means 31 and the second electric field strength level latching means 32, the electric field strength level LA of the company A being used and the electric field strength level LB of the company B not being used are respectively, Each is updated and stored.

The first absolute comparison means 33 compares the electric field strength level LA in use with the set reference level LS, judges whether the electric field strength during communication is in a call difficult state, and the call is possible. If it is determined to be, an output is generated. Further, the second absolute comparison means 34 compares the electric field strength level LB scheduled for re-communication with the set reference level LS,
It is determined whether or not the electric field strength scheduled for re-communication is in a call difficult state, and if it is determined that a call is possible, an output is generated.

The re-communication judging means 35 does not generate an output as long as the first absolute comparison output is generated. If the second absolute comparison output is generated while the first absolute comparison output is no longer generated, it is possible to connect to the company B network.
Generates output for recommunication operation. This output is supplied to the display means 36 and indicates that re-communication is being performed.

When the first absolute comparison output is not generated and the second absolute comparison output is not generated, re-communication is difficult, and therefore an output indicating that the communication state is continued is generated. This output is supplied to the display means 36 and indicates that the communication state may be interrupted on the network side because the communication state is not good. In addition, when the communication is received or during communication, reception control data is input, and communication interruption data indicating that communication has been interrupted on the network side or the other party and the telephone number data of the other party are input.

When the communication interruption data is input, the communication interruption detecting means 37 supplies an output to the display means 36 to indicate that the communication is interrupted. When the telephone number data is input, the telephone number of the other party is stored in the telephone number data latch means 38. When the output for the re-communication operation is input while the re-communication preset means 39 is set to the call-origin state, the call-originating means 40 determines whether the call is made by the incoming call. The telephone number data of the number data latch means 38, and the telephone number data of the redial memory 44 when the call is made by calling, are selected and supplied to the control data generating means 43. As a result, the control data generator 43 outputs the telephone number data of the other party for making a call.

When the output for the re-communication operation is input, the calling instruction means 41 sends the calling instruction to the control data when the output of the re-communication preset means 39 is set to the calling instruction state. It is supplied to the generating means 43. As a result, the control data generating means 43 outputs the calling command data for re-communication. The number data transmission requesting means 42 generates an output when the re-communication presetting means 39 is set to the calling state, and outputs an output for requesting the other party to transmit the telephone number data for re-communication. Control data generating means 43
To supply. As a result, the control data generating means 43 outputs the number data request data.

The number data transmitting means 45 generates an output when the re-communication presetting means 39 is set to the calling instruction state, and transmits the telephone number data of the company B to the other party for re-communication. Is supplied to the control data generating means 43. As a result, the control data generating means 43 outputs the registration number data of company B. Therefore, according to the present embodiment, when the electric field strength level during communication falls below a predetermined level, re-communication is executed if the electric field strength level of the other network is above a predetermined level, and if the electric field strength level of the other network is below a predetermined level. Communication is restricted and the communication status continues. Further, as shown in FIG. 4, in the re-communication, if the call is selected, the call is made to the other party's telephone, and if the call command is selected, the call is requested to the other party.

In the above-described embodiment, re-communication is controlled only by absolute comparison. However, for example, during communication, the network of company A and B
It is also possible to perform re-communication without considering the electric field strength level of the company A's network during a call if the electric field strength levels of the company's network are relatively compared and the company B's network is larger. It is obvious that various configurations are included in the present invention. In addition, although the above-described embodiments describe re-communication between PDCs, there is no problem in re-communication between PHSs or between PDCs and PHSs. Obviously, it is included in the invention.

[0053]

As described above, according to the re-communication method of the present invention, re-communication is executed earlier or conversely prohibited according to the state of the other network during communication. Also, when the other network is at a predetermined level or higher, re-communication is performed,
Re-communication does not fail.

If a net with a high relative level is selected,
The best re-communication is always possible. Further, in addition to the relative level comparison, when re-communication is performed when the level of the network in communication is below a predetermined level, useless re-communication operation can be prevented. Further, if the re-communication is restricted when the other network is below a predetermined level, useless re-communication is prevented.

Further, before re-communication, the telephone number information of the other network is transmitted to the other party, a call request signal is transmitted to the other party at the time of re-communication, and the re-communications can be controlled by the intention of the other party. Further, if the telephone number information of the other party is stored before the re-communication, it is possible to easily make a call by itself during the re-communication. In addition, when the call for re-communication is automatically made after the communication is interrupted, re-communication is realized without inputting a telephone number or the like.

Further, if the dial function is used for making a call for re-communication, re-communication can be performed using the existing function. Also,
If the other party's telephone number information is stored at the time of receiving a call for re-communication, it is possible to perform more reliable storage than that before re-communication in a poor communication state. Further, displaying the fact that a call is being made by re-communication alleviates the anxiety of the user.

On the other hand, in the invention relating to the mobile phone of the present invention, appropriate re-communication control is automatically performed because the electric field strength or communication quality of each available network is detected. Further, when the absolute comparison means is provided, the communication state of the set level is guaranteed. Further, by providing the relative comparison means, it is possible to always select and communicate with a network in good communication condition. Further, if re-communication is restricted based on the output of the absolute comparison means, useless re-communication can be prevented.

If the absolute comparison means and the relative comparison means are combined, more appropriate re-communication becomes possible. In addition, when the re-communication is configured to make a call to the other party, the re-communication can be performed by the user's own will. Also, for re-communication,
When a call is requested from the other party, communication is executed at the other party's expense.

When the own telephone number information is transmitted to the other party, the other party is called through the available network by having the information transmitting means.

[Brief description of drawings]

FIG. 1 is a signal processing circuit block diagram of a PDC mobile phone adopting the present invention.

FIG. 2 is a diagram showing a carrier distribution in a PDC frequency band.

FIG. 3 is a signal arrangement diagram showing a time division transmission state of the PDC.

FIG. 4 is a chart showing the operation of the control means corresponding to the communication state and the re-communication schedule in different cases.

FIG. 5 is a flowchart showing the operation of the control means at the initial stage of communication.

FIG. 6 is a flowchart showing the operation of the control means during communication and the re-communication operation.

FIG. 7 is a functional block diagram of control means.

[Explanation of symbols]

 19 level detection circuit 20 error rate detection circuit 30 control means 33 absolute comparison means

Front page continuation (72) Inventor Jun Kitamoto 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yukari Shiki 2-5-5 Keihan-hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Nagatoshi Sugihara 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (19)

[Claims] 1. A method for re-communication of a mobile phone capable of communicating with a plurality of networks, wherein electric field strength or communication quality of another network is detected during communication using one network, and re-communications by the other network are performed. A re-communication method for a mobile phone, characterized by controlling communication. 2. Re-communication is performed when the electric field strength or communication quality level of the network being communicated is below a predetermined level and the electric field strength or communication quality level of the other network is above a predetermined level. The re-communication method for a mobile phone according to claim 1. 3. The mobile phone according to claim 1, wherein the re-communication is executed when the electric field strength or communication quality level of the other network is higher than the electric field strength or communication quality level during communication. Re-communication method. 4. The re-communication method for a mobile phone according to claim 3, wherein re-communication is performed when the electric field strength of the network during communication or the level of communication quality is lower than a predetermined level. 5. The re-communication method for a mobile phone according to claim 1, wherein re-communication is restricted when the electric field strength or communication quality of the other network is equal to or lower than a predetermined level. 6. The telephone number information of the other network is transmitted to the other party before re-communication, and a call request signal is transmitted to the other party at the time of re-communication. The method for re-communication of a mobile phone set forth in. 7. The telephone number information of the other party is stored before the re-communication, and the other party is called at the time of the re-communication via the other network. Re-communication method for mobile phones. 8. The method of re-communication of a mobile phone according to claim 7, wherein the call is automatically made after communication is interrupted. 9. The re-communication method for a mobile phone according to claim 7, wherein the re-communication in the case where the call originated in the communication is originated by redialing. 10. The telephone number information of the other party is stored in advance at the time of incoming call.
A method of re-communication of a mobile phone according to the item. 11. The re-communication method for a mobile phone according to claim 1, wherein the fact that a call is being made by re-communication is displayed. 12. A level detecting means for detecting the level of electric field strength or communication quality of one network and the other network, and a control means for comparing the output levels of the detecting means to control re-communication. Mobile phone. 13. The mobile phone according to claim 12, wherein the control means has an absolute comparison means for comparing each output level of the both detection means with an absolute value. 14. The mobile phone according to claim 12, wherein the control unit has a relative comparison unit that relatively compares the output levels of the both detection units. 15. The mobile phone according to claim 13, wherein the control unit limits re-communication based on the output of the absolute comparison unit. 16. The mobile phone according to claim 13, wherein the control unit executes re-communication based on the output of the absolute comparison unit and / or the relative comparison unit. 17. The mobile phone according to claim 12, further comprising a calling means for making a call to the other party via the other network after the communication interruption of one network. 18. The mobile phone according to claim 12, further comprising call requesting means for requesting the other party to make a call via the other network for the re-communication during communication. 19. The mobile phone according to claim 18, further comprising a number information transmitting means for transmitting the telephone number information of the other network to the other party.