JP2002300653A - Method for switching radio communication network between portable telephone system and different provider - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable telephone system in which a single mobile terminal can select a radio communication network of better communication quality depending on respective locations in an area where a plurality of providers provide radio communication networks. SOLUTION: In an area where a single mobile terminal 8 can contract radio communication networks of a plurality of providers simultaneously, the mobile terminal comprises means 2 for detecting the receiving signal field strength/error rate of receiving signal of radio communication networks provided by a plurality of providers. Better communication quality can be attained constantly in view point of the receiving signal field strength/error rate of receiving signal in correspondence with the physical conditions of a place where the mobile terminal is located by requesting connection while selecting a radio communication network having a higher receiving field strength or a lower error rate of receiving signal among radio communication networks provided by a plurality of providers based on a detected receiving field strength/error rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone system for switching between communication networks of different operators, a method for switching a wireless communication network between different operators, and a mobile terminal device.

[0002]

2. Description of the Related Art Conventionally, there has been a portable telephone system of this kind as shown in FIG. In the basic configuration diagram of the mobile phone system shown in FIG. 3, a wireless communication network 101 owned by a carrier A is, for example, a mobile terminal device 102 such as a mobile phone, and a base station device performing wireless communication with a plurality of mobile terminal devices 102 103, a plurality of base station apparatuses 103 connected by a wire or the like, and a radio network controller 104 mainly controlling connection of a radio channel, and a plurality of radio network controllers 104 connected to the mobile terminal apparatus 102. And a switching center device 105 that exchanges data with the public network. In addition, the wireless communication network 101 has a service area 106 in which communication is possible within the range.

[0003] The wireless communication network 107 owned by the operator B is:
The configuration is the same as that of the wireless communication network 101 owned by the operator A. Similarly, the wireless communication network 107 has a service area 108 in which communication is possible within the range. The wireless communication network 101 owned by the operator A and the wireless communication network 107 owned by the operator B use exactly the same wireless communication scheme. Therefore, the mobile terminal device 102
It is technically possible to perform communication using the wireless communication network provided by each of the operators A and B, even though they are terminals of a single wireless communication system, by simultaneously contracting.

[0004]

However, even in such a conventional portable telephone system, even when a plurality of carriers can be contracted at the same time, the location of the base station device installed by each carrier can be improved. Therefore, there is a problem that the communication quality may be different depending on the wireless communication network used by each mobile terminal device even within the same area serving as a common service area.

[0005] In particular, in a situation such as near the boundary of a service area, in a building, or while moving, an obstruction between a base station apparatus and a mobile terminal apparatus greatly affects the attenuation or fading of radio signals, and the base station. The effect of device location on communication quality is more pronounced. Therefore, in such a situation, how to select a communication network with higher communication quality from the wireless communication networks provided by a plurality of operators depends on realizing high service quality. Was an issue.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In a region where a plurality of operators provide a wireless communication network employing the same wireless communication system, a single mobile terminal device is used. It is an object of the present invention to provide a method for switching a wireless communication network between a mobile phone system and another carrier and a mobile terminal device, which can select a wireless communication network having better communication quality according to each location.

[0007]

SUMMARY OF THE INVENTION A portable telephone system according to the present invention is a portable telephone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area. Wherein the mobile terminal device is provided by the plurality of contract operators based on the received electric field strength detection means for detecting a received electric field strength of a wireless communication network provided by each of the plurality of contract operators. Control means for selecting a wireless communication network having a higher received electric field strength from the wireless communication networks to be connected and issuing a connection request. According to this configuration, the user can always obtain better communication quality in terms of the received electric field strength, corresponding to the physical conditions without operating.

[0008] A method of switching wireless communication networks between different operators according to the present invention is a mobile telephone system in which a mobile terminal device can simultaneously contract with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area. , The mobile terminal device detects a received electric field strength of a wireless communication network provided by each of the plurality of contracted operators, and detects a received electric field strength of the wireless communication network provided by the plurality of contracted operators based on the detected received electric field strength. And a process for selecting a wireless communication network having a higher received electric field strength, making a connection request, and making a call or waiting for an incoming call. With this configuration,
The user can always obtain better communication quality in terms of the received electric field strength in response to physical conditions without operation.

[0009] The mobile terminal device according to the present invention comprises a receiving electric field strength detecting means for detecting a receiving electric field strength of a wireless communication network provided by each of a plurality of contracting operators, and the plurality of contracting operators based on the detected receiving electric field strengths. And a control means for selecting a wireless communication network having a higher received electric field strength from among the wireless communication networks provided by the communication device, making a connection request, and making a call or waiting for an incoming call. According to this configuration, the user can always obtain better communication quality in terms of the received electric field strength, corresponding to the physical conditions without operating.

[0010] The mobile terminal device according to the present invention comprises a receiving electric field strength detecting means for detecting a receiving electric field strength of a radio communication network provided by each of a plurality of contracted operators, and a radio communication network provided by the plurality of contracted operators. Input means for arbitrarily selecting and inputting a wireless communication network to be connected from among the plurality, and when the wireless communication network to be connected is not selected by the input means, based on the reception electric field strength detected by the reception electric field strength detection means, The wireless communication network provided by the contracted business operator is provided with control means for automatically selecting a wireless communication network having a higher received electric field strength, making a connection request, and making a call or waiting for an incoming call. are doing. With this configuration,
The user can respond to physical conditions without operation, always obtain better communication quality in terms of the received electric field strength, and in some cases, regardless of the communication quality, adjust the user's preference to any A wireless communication network can be selected.

[0011] The mobile terminal device according to the present invention has a configuration in which a display unit for displaying the name of a contracted provider that provides a wireless communication network to be connected to is provided. With this configuration,
It is possible to notify the user of the business operator providing the wireless communication network of the connection destination.

[0012] A mobile phone system according to the present invention is a mobile phone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area. Error rate detecting means for detecting an error rate of a received demodulated signal of a wireless communication network provided by each of the plurality of contract carriers; and a wireless communication network provided by the plurality of contract carriers based on the detected error rate. And a control means for selecting a wireless communication network having a lower error rate of the received demodulated signal and requesting a connection. With this configuration, the user can always obtain better communication quality from the viewpoint of the error rate of the received signal in response to the physical condition without operation.

A method of switching wireless communication networks between different operators according to the present invention is a mobile telephone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area. The mobile terminal device detects an error rate of a received demodulated signal of a wireless communication network provided by each of the plurality of contracted operators, and provides the plurality of contracted operators based on the detected error rate of the received demodulated signal. Wireless communication network having a lower error rate of the received demodulated signal from the wireless communication network to make a connection request, and perform a call or call waiting process. With this configuration, the user does not need to operate
Corresponding to the physical conditions, it is possible to always obtain better communication quality in terms of the error rate of the received signal.

According to the present invention, there is provided a mobile terminal device comprising: an error rate detecting means for detecting an error rate of a received demodulated signal of a wireless communication network provided by each of a plurality of contract carriers; Control means for selecting a wireless communication network having a lower error rate of a received demodulated signal from wireless communication networks provided by a plurality of contracted operators, making a connection request, and making a call or waiting for an incoming call; have. With this configuration, the user does not need to operate
Corresponding to the physical conditions, it is possible to always obtain better communication quality in terms of the error rate of the received signal.

[0015] The mobile terminal device according to the present invention comprises an error rate detecting means for detecting an error rate of a received demodulated signal of a wireless communication network provided by each of a plurality of contract operators, and a radio communication system provided by the plurality of contract operators. An input means for arbitrarily selecting and inputting a wireless communication network to be connected from the network, and an error rate of a received demodulated signal detected by the error rate detecting means when the wireless communication network to be connected is not selected by the input means. Control means for automatically selecting a wireless communication network having a lower error rate of a received demodulated signal from among the wireless communication networks provided by the plurality of contracted operators, making a connection request, and making a call or waiting for an incoming call. Is provided. With this configuration, the user can respond to physical conditions without operation, and always obtain better communication quality in terms of the error rate of the received signal, and in some cases, regardless of the communication quality, An arbitrary wireless communication network can be selected according to taste.

[0016] The mobile terminal device according to the present invention has a configuration including a display unit for displaying the name of a contracted company that provides a wireless communication network to be connected. With this configuration,
It is possible to notify the user of the business operator providing the wireless communication network of the connection destination.

A portable telephone system according to the present invention is a portable telephone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area. A base station device to be connected, a reception electric field intensity detection unit for detecting a reception electric field intensity of a reception signal from the mobile terminal device, and a storage unit for storing a threshold value of the reception electric field intensity necessary for maintaining the quality of the reception signal; Control means for requesting a source mobile terminal device of a received signal having a received electric field strength lower than the threshold value to switch the connection to a wireless communication network of another operator, wherein the mobile terminal receiving the connection switching request The apparatus has a configuration including control means for making a connection request to a wireless communication network of another contracted carrier in accordance with the connection switching request. According to this configuration, the user can always obtain better communication quality according to the physical conditions and according to the threshold value of the reception electric field strength without performing any operation.

A method for switching a wireless communication network between different operators according to the present invention is a mobile telephone system in which a mobile terminal device can simultaneously contract with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area. In, the base station device connected to the mobile terminal device, detects the received signal strength of the received signal from the mobile terminal device, pre-stored the threshold value of the received signal strength required to maintain the quality of the received signal, Each step of requesting the source mobile terminal device of the received signal having a lower received electric field strength than the threshold value to switch the connection to the wireless communication network of another operator, the mobile terminal device having received the connection switching request In accordance with the connection switching request, a connection request is made to a wireless communication network of another contract carrier, and a process for making a call or waiting for an incoming call is provided. According to this configuration, the user can always obtain better communication quality according to the physical conditions and according to the threshold value of the reception electric field strength without performing any operation.

The base station apparatus according to the present invention stores reception electric field strength detecting means for detecting a reception electric field strength of a reception signal from a mobile terminal apparatus, and stores a threshold value of the reception electric field strength necessary for maintaining the quality of the reception signal. Storage means, and a control means for requesting the transmission source mobile terminal device of the received signal having a received electric field strength lower than the threshold value to switch the connection to the wireless communication network of another operator. I have. According to this configuration, the user can always obtain better communication quality according to the physical conditions and according to the threshold value of the reception electric field strength without performing any operation.

A portable telephone system according to the present invention is a portable telephone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area. The base station device to be connected includes: an error rate detection unit that detects an error rate of a demodulated signal received from the mobile terminal device; and a storage that stores a threshold value of an error rate of the received demodulated signal necessary for maintaining the quality of the received signal. Means for requesting the source mobile terminal of a received signal having a higher error rate of the received demodulated signal than the threshold value to switch the connection to the wireless communication network of another operator; The mobile terminal device that has received the request has a configuration including control means for issuing a connection request to the wireless communication network of another contracted carrier in accordance with the connection switching request. According to this configuration, the user can always obtain better communication quality based on the threshold of the error rate of the received signal, corresponding to the physical condition without operating the user.

[0021] A method for switching wireless communication networks between different operators according to the present invention is a mobile telephone system in which a mobile terminal device can simultaneously contract with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area. A base station device connected to the mobile terminal device detects an error rate of a received demodulated signal from the mobile terminal device, and sets a threshold value of an error rate of the received demodulated signal necessary for maintaining the quality of the received signal in advance. Storing, and requesting the source mobile terminal device of the received signal having a higher error rate of the received demodulated signal than the threshold value to switch the connection to the wireless communication network of another operator. The received mobile terminal device has a configuration of providing a connection request to a wireless communication network of another contract carrier in accordance with the connection switching request, and performing a call or call waiting process. According to this configuration, the user can always obtain better communication quality based on the threshold of the error rate of the received signal, corresponding to the physical condition without operating the user.

According to the present invention, there is provided a base station apparatus comprising: an error rate detecting means for detecting an error rate of a demodulated signal received from a mobile terminal apparatus; and a threshold of an error rate of the demodulated signal required for maintaining the quality of the received signal. Storage means for storing, and control means for requesting the transmission source mobile terminal apparatus of the received signal having an error rate of the received demodulated signal higher than the threshold value to switch the connection to the wireless communication network of another operator. It has a configuration. According to this configuration, the user can always obtain better communication quality based on the threshold of the error rate of the received signal, corresponding to the physical condition without operating the user.

In the mobile terminal device according to the present invention, when a base station device connected to the mobile terminal device requests to switch the connection of the wireless communication network, the mobile terminal device automatically selects a wireless communication network of another contract carrier. And a control unit for making a connection request and making a call or waiting for an incoming call. According to this configuration, the user can respond to the physical conditions without operating, and can always obtain better communication quality in response to a request from the base station.

[0024] The mobile terminal device according to the present invention comprises: input means for arbitrarily selecting and inputting a radio communication network to be connected from radio communication networks provided by a plurality of contracted carriers; and radio communication connecting from the input means. When a network is input, the wireless communication network is selected, and when a base station device connected to the mobile terminal requests to switch the wireless communication network connection, the wireless communication network of another contracted carrier is automatically switched. And a control means for making a connection request by making a call or waiting for a call or an incoming call. With this configuration, the user can respond to physical conditions without operation, always obtain better communication quality at the request of the base station or at the user's choice, and in some cases, the communication quality Regardless, any wireless communication network can be selected according to the user's preference.

The mobile terminal device according to the present invention has a configuration including a display unit for displaying the name of a contracted business operator providing a wireless communication network to be connected. With this configuration,
It is possible to notify the user of the business operator providing the wireless communication network of the connection destination.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first and second embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, before describing embodiments of the present invention in detail, a background for achieving the object of the present invention will be described with reference to FIGS. First, with reference to FIG. 4, a concept of a service area of a mobile phone wireless communication network provided by an operator and communication in a plurality of wireless zones constituting the service area will be described. In FIG. 4, a mobile phone service area 201 is shown.
Is composed of a plurality of overlapping wireless zones 202, and a base station 203 is arranged in each wireless zone 202. Therefore, even within the service area 201, certain communication may occur due to the influence of radio signal attenuation or fading due to physical conditions such as distance, obstacles, and movement between the base station 203 and the mobile terminal device. It doesn't mean you get the quality.

Next, with reference to FIG. 5, a description will be given of the concept of overlapping service areas when a plurality of operators provide the above-mentioned portable telephone wireless communication network within the same (common) area. I do. FIG. 5 shows a service area 301 by the operator A and a service area 30 by the operator B.
2 and a portion 3 where each service area 301 and 302 overlaps
03 are respectively represented. According to the present invention, when the mobile terminal device contracted with the carrier A and the carrier B is in the overlapping portion 303 of the respective service areas 301 and 302, the mobile terminal device is determined based on the received electric field strength or the error rate of the received demodulated signal. A communication network with the best communication quality is selected, a connection request is made to this communication network, and a call or an incoming call can be awaited.

Next, with reference to FIG. 1, a description will be given of the configuration of a mobile terminal apparatus used in a mobile telephone system and a method of switching a wireless communication network between different carriers according to the first embodiment of the present invention. In FIG. 1, a mobile terminal device 8 includes a transmitting / receiving unit 1 for receiving / demodulating, modulating / transmitting a signal, and a reception electric field of a wireless communication network provided by a plurality of contracted carriers (referred to as contracted carriers). A receiving electric field strength / error rate detecting unit 2 for detecting the strength or the receiving error rate, and a radio communication network to be connected to from among radio communication networks provided by a plurality of operators to which the user has contracted are arbitrarily selected and input. Input part 3 to do
And a contracted carrier database 4 for storing information (hereinafter, referred to as unique information) such as a communication protocol and an identification ID unique to each of a plurality of contracted carriers, Display unit 5 for displaying the name of the provider of the already connected wireless communication network
A control unit 6 for selecting a wireless communication network to be connected based on a detection result in the reception electric field strength / error rate detection unit 2 or an input signal from the input unit 3 and controlling the components 1 to 6 and the like; An antenna 7 is provided.

Next, with reference to FIG. 1, the operation of the mobile telephone system and the method of switching the wireless communication network between different operators according to the operation of the mobile terminal device according to the first embodiment of the present invention will be described. First, for each wireless communication network provided by a plurality of contracted operators, the transmitting / receiving unit 1 via the antenna 7
, The received electric field strength / error rate detection unit 2 detects each electric field strength or error rate, and sends the detection result to the control unit 6. The control unit 6 automatically selects a wireless communication network with the highest received electric field strength or a wireless communication network with the lowest error rate from the input detection results. Further, the control unit 6 stores the unique information of the provider that provides the wireless communication network with the contracted provider database 4.
, And makes a connection request to the wireless communication network,
Performs incoming call waiting or calling operation.

On the other hand, the user can arbitrarily select a wireless communication network for making a connection request from the input unit 3. In this case, the control unit 6 irrespective of the detection result of the reception electric field strength / error rate detection unit 2, irrespective of the detection result of the wireless communication network provided by the user through the input unit 3 and designated by the user. It reads out from the contracted carrier database 4, makes a connection request to a wireless communication network provided by the carrier, and performs an incoming call waiting or calling operation. In any case, the control unit 6 displays the name of the provider of the wireless communication network to be connected on the display unit 5 to notify the user.

Incidentally, in the first embodiment of the present invention,
The same effect can be obtained by selecting a wireless communication network based on the detection results of both the received field strength and the error rate, without limiting the communication quality determination criteria to either the received field strength or the error rate. Can be obtained.

As described above, according to the first embodiment of the present invention, in the mobile terminal device, the reception field strength or the error rate is determined for each wireless communication network provided by a plurality of contracted operators. By detecting and selecting a wireless communication network with the highest received electric field strength or a wireless communication network with the lowest error rate, making a connection request, and performing an incoming call waiting or calling operation, the user does not operate, Better communication quality can always be obtained according to physical conditions.
Further, since the user can select an arbitrary wireless communication network regardless of the reception electric field strength or the error rate, the user can appropriately use the wireless communication network according to the usage form and preference of the user. In addition, by displaying the name of the provider of the wireless communication network making the connection request and the wireless communication network being connected, the user can be notified of the selected wireless communication network.

Next, with reference to FIG. 2, the configurations of a mobile terminal device and a base station device used in a mobile telephone system and a method for switching a wireless communication network between different carriers according to a second embodiment of the present invention will be described. I do. In FIG. 2, in the first embodiment shown in FIG. 1, the reception field strength / error rate detection unit 2 provided in the mobile terminal device 8 is moved to a base station device 10 which is a fixed station. A storage unit 9 for storing a point and a threshold value of a received electric field strength or an error rate set so as to maintain a certain communication quality is also stored in a base station apparatus 10.
The configuration differs from the configuration of the first embodiment in that the configuration is prepared for. In addition, since the components denoted by the same reference numerals as those in FIG. 1 shown in FIG. 2 are the same, the description will be omitted.

Next, with reference to FIG. 2, the operation of the mobile phone system and the method of switching the wireless communication network between different carriers by the operation of the mobile terminal device and the base station device according to the second embodiment of the present invention. explain. First, in the base station device 10, a transmission signal of each mobile terminal device 8 during connection or requesting connection is transmitted to the transmission / reception unit 1
And the received electric field strength / error rate detection unit 2 detects the electric field strength or error rate, and the detection result is sent to the control unit 6
Send to The control unit 6 compares the input detection result with the threshold value stored in the storage unit 9 and, if the detection result is the received electric field strength, when the detection result is lower than the threshold value. Or, if the detection result is an error rate, when the detection result is higher than the threshold value, the transmission / reception unit 1 and the antenna 7 transmit the received signal to the mobile terminal device 8 that is the transmission source of the reception signal. On the other hand, it transmits a wireless communication network switching request signal.

On the other hand, in the mobile terminal device 8, the transmission / reception unit 1 receives the wireless communication network switching request signal via the antenna 7 and transmits it to the control unit 6. The control unit 6 automatically selects an arbitrary wireless communication network from wireless communication networks provided by another contracted operator different from the currently connected wireless communication network. Further, the control unit 6 reads out the unique information of the provider that is the provider of the wireless communication network from the contracted provider database 4, makes a connection request to the wireless communication network, and performs an incoming call waiting or calling operation. .

On the other hand, the user of the mobile terminal device 8 can arbitrarily select a wireless communication network for making a connection request from the input unit 3. In this case, the control unit 6 of the mobile terminal device 8 determines whether or not the wireless communication network switching request signal transmitted from the base station device 10 is present, regardless of the presence or absence of the wireless communication network switching request signal. The information is read from the contracted carrier database 4, a connection request is made to a wireless communication network provided by the carrier, and an incoming call waiting or a calling operation is performed. In any case, the control unit 6 displays the name of the provider of the wireless communication network to be connected on the display unit 5 to notify the user.

In the second embodiment of the present invention,
The criterion for determining the communication quality in the base station apparatus 10 is not limited to either the received signal strength or the error rate, and the wireless communication network switching request signal is moved based on the detection results of both the received signal strength and the error rate. The same effect can be obtained even when the transmission is performed to the terminal device 8.

As described above, according to the second embodiment of the present invention, the reception field strength or the error rate is detected for each mobile terminal 8 connected or requesting connection in the base station apparatus 10. The detection result is compared with a threshold value set to maintain a certain communication quality, and when the comparison target is the reception electric field strength, when the detection result is lower than the threshold value, When the detection result is an error rate, when the detection result is higher than the threshold value, a wireless communication network switching request signal is transmitted to the mobile terminal device 8 that is the source of the received signal.

On the other hand, when the mobile terminal device 8 receives the wireless communication network switching request signal from the base station device 10, the mobile terminal device 8 establishes a contract with the wireless communication network of another carrier different from the currently connected wireless communication network. A connection request is made, and an incoming call waiting or calling operation is performed. By repeating the above operation, the user can always obtain better communication quality according to the physical condition of the place where the mobile terminal device 8 is placed without any operation by the user. In addition, the user can select an arbitrary wireless communication network regardless of the received electric field strength or the error rate, so that the user can appropriately use the wireless communication network according to a use form and taste. Also, by displaying the name of the provider of the wireless communication network making the connection request and the wireless communication network being connected, the user can be notified of the selected wireless communication network.

[0040]

The wireless communication network switching method according to the present invention between the mobile telephone system and the different service provider is configured as described above. In particular, in the mobile terminal device, the wireless service provided by a plurality of contracted service providers is provided. By selecting a wireless communication network having a higher received electric field strength or a wireless communication network having a lower reception error rate from among the communication networks to make a connection request,
The user can always obtain better communication quality from the viewpoint of the received electric field strength or the error rate of the received signal, corresponding to the physical conditions such as the environment where the mobile terminal device is placed, without any operation. .

Further, according to the present invention, in the base station apparatus, the reception field strength or reception error rate of a signal received from a mobile terminal apparatus is compared with a threshold value, and if the reception field strength is lower than the threshold value or the reception error When the rate is higher than the threshold value, the wireless communication network switching request signal is transmitted to the source mobile terminal apparatus to switch to the wireless communication network of another operator, so that the user can operate the mobile terminal apparatus. It is possible to always obtain better communication quality from the viewpoint of the received electric field strength or the error rate of the received signal, corresponding to the physical conditions such as the environment where the mobile terminal device is placed, without requiring the communication terminal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile terminal device constituting a mobile phone system according to a first embodiment of the present invention;

FIG. 2 is a block diagram showing the configurations of a mobile terminal device and a base station device that constitute a mobile phone system according to a second embodiment of the present invention;

FIG. 3 is a diagram showing a basic configuration of a conventional mobile phone system;

FIG. 4 is a conceptual diagram of a service area of a mobile phone wireless communication network provided by an operator and communication in a plurality of wireless zones constituting the service area;

FIG. 5 is a conceptual diagram of overlapping service areas when a plurality of operators provide a mobile phone wireless communication network in the same area.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 transmission / reception unit 2 reception electric field strength / error rate detection unit 3 input unit 4 contractor database 5 display unit 6 control unit 7 antenna 8 mobile terminal device 9 storage unit 10 base station device 101 wireless communication network owned by operator A 102 Mobile terminal 103 Base station 104 Radio network controller 105 Switching center 106, 108 Service area 107 Wireless communication network owned by operator B 201 Mobile phone service area 202 Wireless zone 203 Base station 301 Service area provided by operator A 302 Operator B service area 303 Overlapping part of service area by operator A and operator B

Claims (19)

[Claims] 1. A mobile telephone system in which a mobile terminal device can make a contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area, wherein the mobile terminal device is provided with the plurality of contracted businesses. Receiving electric field intensity detecting means for detecting the receiving electric field intensity of the wireless communication network provided by each of the subscribers, and a receiving electric field intensity higher from among the wireless communication networks provided by the plurality of contract operators based on the detected receiving electric field intensity. Control means for selecting a wireless communication network and issuing a connection request. 2. A mobile telephone system in which a mobile terminal device can make a contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area, wherein the mobile terminal device is provided with the plurality of contracted businesses. Detects the received electric field strength of the wireless communication network provided by each of the subscribers, and selects a wireless communication network having a higher received electric field strength from the wireless communication networks provided by the plurality of contract operators based on the detected received electric field strength. A method of switching between wireless communication networks between different businesses, comprising the steps of: making a connection request through a network and making a call or waiting for an incoming call. 3. A receiving electric field intensity detecting means for detecting a receiving electric field intensity of a wireless communication network provided by each of a plurality of contracted operators, and a radio communication network provided by the plurality of contracted operators based on the detected receiving electric field intensity. Control means for selecting a wireless communication network having a higher received electric field strength from among them, making a connection request, and making a call or waiting for an incoming call. 4. A receiving electric field strength detecting means for detecting a receiving electric field strength of a wireless communication network provided by each of a plurality of contracted operators, and a wireless communication connected from a wireless communication network provided by said plurality of contracted operators. Input means for arbitrarily selecting and inputting a network, and when the wireless communication network to be connected is not selected by the input means, the plurality of contract operators provide based on the received electric field strength detected by the received electric field strength detecting means. A mobile terminal device comprising: control means for automatically selecting a wireless communication network having a higher received electric field strength from a wireless communication network, making a connection request, and making a call or waiting for an incoming call. 5. The mobile terminal device according to claim 3, further comprising a display unit for displaying a name of a contracted provider providing a wireless communication network of a connection destination. 6. A mobile phone system in which a mobile terminal device can make a contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area, wherein the mobile terminal device has a plurality of contracted businesses. Error rate detecting means for detecting the error rate of the received demodulated signal of the wireless communication network provided by each of the subscribers, and from the wireless communication network provided by the plurality of contract operators based on the detected error rate, Control means for selecting a wireless communication network with a low error rate and issuing a connection request. 7. A mobile telephone system in which a mobile terminal device can make a contract simultaneously with a plurality of providers providing a wireless communication network of the same wireless communication system in the same area, wherein the mobile terminal device is provided with the plurality of contracted businesses. The error rate of the demodulated signal of the wireless communication network provided by each of the subscribers is detected, and based on the detected error rate of the received demodulated signal, the error of the received demodulated signal is increased from among the wireless communication networks provided by the plurality of contract operators. A method for switching a wireless communication network between different operators, comprising the steps of selecting a wireless communication network having a low rate, making a connection request, and making a call or waiting for an incoming call. 8. An error rate detecting means for detecting an error rate of a received demodulated signal of a wireless communication network provided by each of a plurality of contracted operators, and said plurality of contracted operators are provided based on the detected error rate of the received demodulated signal. A mobile terminal device comprising: a control unit that selects a wireless communication network having a lower error rate of a received demodulated signal from a wireless communication network to be provided, issues a connection request, and initiates a call or an incoming call. . 9. An error rate detecting means for detecting an error rate of a received demodulated signal of a wireless communication network provided by each of a plurality of contracted operators, and connected from among the wireless communication networks provided by said plurality of contracted operators. An input means for arbitrarily selecting and inputting a wireless communication network; and a plurality of contracted services based on an error rate of a received demodulated signal detected by the error rate detecting means when a wireless communication network to be connected is not selected by the input means. Control means for automatically selecting a wireless communication network having a lower error rate of a received demodulated signal from a wireless communication network provided by a user, making a connection request, and making a call or waiting for an incoming call. Mobile terminal device. 10. The mobile terminal device according to claim 8, further comprising a display unit for displaying a name of a contracted business operator providing a wireless communication network to be connected. 11. A mobile telephone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area, wherein the base station device connected to the mobile terminal device is Receiving electric field intensity detecting means for detecting the received electric field intensity of the received signal from the mobile terminal device, storage means for storing a threshold value of the received electric field intensity necessary for maintaining the quality of the received signal, Control means for requesting the transmission source mobile terminal device of the reception signal having a low reception electric field strength to switch the connection to the wireless communication network of another operator, and the mobile terminal device having received the connection switching request transmits the connection switching request. A mobile telephone system comprising a control unit for making a connection request to a wireless communication network of another contracted company according to the above. 12. A mobile telephone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area, wherein a base station device connected to the mobile terminal device is provided. Detecting the reception electric field strength of the reception signal from the mobile terminal device, storing in advance the threshold value of the reception electric field strength necessary for maintaining the quality of the reception signal, and receiving the reception electric field strength lower than the threshold value. Each step of requesting the source mobile terminal device to switch the connection to the wireless communication network of another carrier, and the mobile terminal device receiving the connection switch request makes the wireless communication of another contract carrier according to the connection switch request. A method for switching a wireless communication network between different carriers, comprising a step of making a connection request to a network and making a call or waiting for an incoming call. 13. A receiving electric field intensity detecting means for detecting a receiving electric field intensity of a received signal from a mobile terminal device, and a storing means for storing a threshold value of the receiving electric field intensity necessary for maintaining the quality of the received signal. A base station apparatus comprising: control means for requesting a source mobile terminal apparatus of a received signal having a received electric field strength lower than a threshold value to switch connection to a wireless communication network of another operator. 14. A mobile telephone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area, wherein the base station device connected to the mobile terminal device is Error rate detection means for detecting an error rate of a demodulated signal received from the mobile terminal device; storage means for storing a threshold value of an error rate of the received demodulated signal necessary for maintaining the quality of the received signal; Control means for requesting the source mobile terminal device of the received signal having a higher error rate of the received demodulated signal than the value to switch the connection to the wireless communication network of another operator, and the mobile terminal device receiving the connection switching request A mobile phone system comprising: control means for issuing a connection request to a wireless communication network of another contract carrier in accordance with the connection switching request. 15. A mobile telephone system in which a mobile terminal device can contract simultaneously with a plurality of operators providing a wireless communication network of the same wireless communication system in the same area, wherein a base station device connected to the mobile terminal device is provided. Detecting the error rate of the demodulated signal received from the mobile terminal device, storing in advance the threshold value of the error rate of the received demodulated signal necessary for maintaining the quality of the received signal, The mobile terminal device having a higher rate of reception of the received signal, the mobile terminal device having a request to switch the connection to the wireless communication network of another carrier, the mobile terminal device having received the connection switch request, in accordance with the connection switch request, Making a connection request to the wireless communication network of the contracted carrier and making a call or waiting for an incoming call. 16. An error rate detecting means for detecting an error rate of a demodulated signal received from a mobile terminal device, a storage means for storing a threshold value of an error rate of the received demodulated signal necessary for maintaining the quality of the received signal, A base station comprising: a control unit that requests a source mobile terminal device of a received signal having an error rate of a received demodulated signal higher than the threshold value to switch a connection to a wireless communication network of another operator. apparatus. 17. When a request for switching connection of a wireless communication network is issued from a base station device connected to a mobile terminal device, a wireless communication network of another contract operator is automatically selected and a connection request is made. A mobile terminal device comprising control means for making a call or waiting for an incoming call. 18. An input means for arbitrarily selecting and inputting a wireless communication network to be connected from wireless communication networks provided by a plurality of contracted operators, and a method for inputting a wireless communication network to be connected from said input means. When the wireless communication network is selected and the base station device connected to the mobile terminal device requests to switch the wireless communication network connection, the wireless communication network of another contracted carrier is automatically selected and the connection request is made. And a control means for making a call or waiting for an incoming call. 19. The mobile terminal device according to claim 17, further comprising a display unit for displaying a name of a contracted provider providing a wireless communication network of a connection destination.