JP2006237749A - Base station device, mobile terminal and radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication system eliminating the need for a re-dialling operation by a user and having an excellent usability, even when the user is moved while using a mobile terminal and comes off from a service area for a communication service company. <P>SOLUTION: A transmission-reception control unit 110 controls a communication with the mobile terminal 50. An electric-field intensity measuring section 120 periodically measures the electric-field intensity of radio waves received from the mobile terminal 50. A call-connection processor 130 controls the connection of a call with the mobile terminal (not shown) on the opposite side through a public circuit 1 and an exchange. The call-connection processor 130 indicates the settlement of a bypass circuit with a base station device 200 to a connection control unit 150 when the call-connection processor 130 receives the information that the electric-field intensity of the radio waves from the mobile terminal 50 reaches a reference level or less from the electric-field intensity measuring section 120. The connection control unit 150 settles the bypass circuit with the base station device 200 according to an indication from the call-connection processor 130. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio communication system having a base station device and a mobile terminal.

Conventionally, by measuring the electric field strength between each base station device and mobile terminal of a plurality of communication service companies, considering the travel distance estimated for the mobile terminal and the service area and wireless area of each communication service company, A communication line automatic selection device in a mobile radio that makes it possible to select the cheapest communication line is disclosed (for example, see Patent Document 1).
JP-A-9-284852

  However, although the above-described conventional technology allows the cheapest communication line to be selected and connected when a call is made, the line is disconnected if the user moves out of the service area of the communication service company. Therefore, the user has to perform a redial operation, which is troublesome.

  Accordingly, the present invention has been made in view of the above problems, and provides a wireless communication system and the like that eliminates the need for redial operation by the user even when the user moves out of the service area while using the mobile terminal. The purpose is to do.

  In order to achieve the above object, a base station apparatus according to the present invention includes an electric field strength acquisition means for acquiring electric field strength of radio waves used between a mobile terminal communicating in the first communication mode and the apparatus in the first communication area. And an electric field strength determination unit that determines whether or not the electric field strength acquired by the first electric field strength acquisition unit is smaller than a first reference value, and an electric field strength that is smaller than the first reference value by the electric field strength determination unit. Control for causing communication between the communication partner terminal with which the mobile terminal is communicating via the device and the mobile terminal moved into the second communication area adjacent to the first communication area when determined. And a connection control means for performing to other base station apparatuses in the second communication area.

  As a result, when the user moves out of the service area of the first communication service company, communication is continued using the line with the second communication service company, so the call between the users is disconnected. It becomes possible to avoid that.

  Note that the present invention is realized as a communication control method using the characteristic configuration means in the base station apparatus as a step, or as a radio communication system including the base station apparatus and a mobile terminal using the base station apparatus. Needless to say, you can.

  According to the wireless communication system of the present invention, even when the user moves away from the service area of the first communication service company because he / she moves using the mobile terminal, the communication is performed using the line of the second communication service company. Since it continues, it can avoid that the telephone call between users cuts off.

  Further, according to the wireless communication system of the present invention, even if the line is disconnected because the user moves out of the service area of the first communication service company because the user moves while using the mobile terminal, Since the connection is automatically made to the line of the communication service company, the redial operation by the user becomes unnecessary.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In addition, although this invention is demonstrated using the following embodiment and attached drawing, this is for the purpose of illustration and this invention is not intended to be limited to these.

(Embodiment 1)
FIG. 1 is a diagram showing an outline of a wireless communication system 5 in the present embodiment. As shown in FIG. 1, a user who uses a mobile terminal 50 (for example, a mobile phone) of the wireless communication system 5 in the present embodiment moves from the service area 10 of the communication service company A to the service area 20 of the communication service company B. Even in the case of moving, communication such as conversation can be continued without performing a redial operation or the like.

  FIG. 2 is a block diagram showing functional configurations of base station apparatus 100 and base station apparatus 200 according to the present embodiment. As illustrated in FIG. 2, the base station apparatus 100 includes a transmission / reception control unit 110, an electric field strength measurement unit 120, a call connection processing unit 130, a storage unit 140, and a connection control unit 150.

  The transmission / reception control unit 110 controls communication with the mobile terminal 50. The electric field strength measurement unit 120 measures the electric field strength of radio waves received from the mobile terminal 50 periodically (for example, every second). Specifically, when the electric field strength of the radio wave of the mobile terminal 50 during a call falls below a preset reference level (also referred to as “threshold”), the call connection processing unit 130 notifies that fact. Notify

  The call connection processing unit 130 is, for example, a microcomputer having a ROM, a RAM, and the like, and controls connection of a call with a mobile terminal (not shown) on the other side via the public line 1 and an exchange (not shown). To do. Further, the call connection processing unit 130 establishes a bypass line with the base station apparatus 200 when receiving a notification from the electric field strength measuring unit 120 that the electric field strength of the radio wave of the mobile terminal 50 is below the reference level. Thus, the connection control unit 150 is instructed.

  The storage unit 140 is a hard disk or the like for accumulating various necessary data, and includes a billing DB 241 for accumulating information related to user billing and a traffic DB 242 for accumulating information regarding call volume measurement and call volume performance. Prepare.

  The connection control unit 150 has a function of establishing a bypass line with the base station apparatus 200 in accordance with an instruction from the call connection processing unit 130, and includes a call control unit 151 and a bypass control unit 152.

  When the communication service company A provides a communication service, the call control unit 151 temporarily controls a protocol for establishing a line with the mobile terminal 50 via the base station device 200 of the communication service company B in parallel. .

  The bypass control unit 152 controls communication with the mobile terminal 50 using the bypass line established in the call control unit 151.

  On the other hand, the base station apparatus 200 includes a transmission / reception control unit 210, an electric field strength measurement unit 220, a call connection processing unit 230, and a storage unit 240. The functions of the transmission / reception control unit 210, the electric field strength measurement unit 220, the call connection processing unit 230, and the storage unit 240 are the same as the transmission / reception control unit 110, the electric field strength measurement unit 120, the call connection processing unit 130, and the storage in the base station device 100. Since it is the same as the unit 140, the description thereof is omitted. The base station apparatus 200 may include the connection control unit 150 and have a functional configuration equivalent to that of the base station apparatus 100.

  Furthermore, in the present embodiment, an example in which the electric field strength measuring unit is provided in the base station device has been shown. However, of course, the electric field strength measuring unit is provided in the mobile terminal and configured to transmit the measured electric field strength to the base station device. Also good.

  FIG. 3 is a diagram illustrating the telephone numbers of the mobile terminals owned by Mr. X who is the user of the mobile terminal 50 and Mr. Y who is the communication partner of Mr. X in the present embodiment. As shown in FIG. 3, since Mr. X and Mr. Y subscribe to the communication service company A and the communication service company B, each mobile terminal is assigned one telephone number from each company. .

  FIG. 4 is a schematic diagram for explaining how the electric field strength of the mobile terminal 50 changes as Mr. X moves. As shown in FIG. 4, when Mr. X moves from the service area 10 of the communication service company A to the service area 20 of the communication service company B, the electric field strength of the radio wave between the mobile terminal 50 and the base station apparatus 100 is a curve 41. As shown, the strength gradually decreases. On the contrary, the electric field strength of the radio wave between the mobile terminal 50 and the base station device 200 gradually increases as shown by the curve 42. In this case, when the electric field strength of the radio wave between the mobile terminal 50 and the base station apparatus 100 is lower than the preset “threshold value Et” (that is, the electric field strength is 41a), the communication service company A The communication service company B starts processing for switching the communication service, and the electric field strength of the radio wave between the mobile terminal 50 and the base station device 200 exceeds a preset “threshold value Et” (that is, the electric field strength). 42a), the processing for switching the communication service from the communication service company A to the communication service company B is completed. In the example of FIG. 4, the service area 10 and the service area 20 have the same threshold value. However, of course, the service area 10 and the service area 20 are appropriately different depending on the radio wave conditions of the service area 10 and the service area 20. A threshold value may be set.

Next, the operation of the wireless communication system 5 configured as described above will be described.
FIG. 5 is a flowchart showing a processing flow of base station apparatus 100 in the present embodiment.

  For example, when a line is established by Mr. X who is a user of the mobile terminal 50 by calling Mr. Y in the service area 10 (that is, via the communication service company A) (S10), the call connection processing unit 130 The measurement result of the electric field strength of the radio wave between the base station device 100 and the mobile terminal 50 is periodically received from the electric field strength measuring unit 120 (S11). If the value of the electric field strength falls below the predetermined threshold (S12: Yes), the call connection processing unit 130 instructs the connection control unit 150 to execute the signaling bypass process.

  Then, the connection control unit 150 executes a signaling bypass process with the base station apparatus 200 installed in the service area 20 of the communication service company B (S13).

  After performing the signaling bypass processing normally, the call connection processing unit 130 switches the communication service from the communication service company A to the communication service company B (S14) (that is, disconnects the line between the base station apparatus 100 and the mobile terminal 50) To do).

  FIG. 6 is a flowchart showing the contents of the signaling bypass process (S13) in FIG.

  First, upon receiving the above instruction from the call connection processing unit 130, the connection control unit 150 specifies the telephone number 32 in the communication service company B of Mr. X who is the user of the mobile terminal 50 (S20). The telephone number 41 of Mr. Y who is the other party to call (that is, the communication service company A) is specified (S21).

  Thereafter, the connection control unit 150 notifies the base station apparatus 200 of the identified telephone number 32 and telephone number 41 (S22).

  Further, the connection control unit 150 connects the base station apparatus 100 and the base station apparatus 200 to establish a bypass line (S23), and receives a notification from the base station apparatus 200 that “call is possible” ( S24: Yes), this process is terminated.

  FIG. 7 is a flowchart showing a processing flow of base station apparatus 200 in the present embodiment.

  First, when receiving the telephone number 32 and the telephone number 41 from the base station apparatus 100 (S30), the call connection processing unit 230 tries to establish a bypass line between the base station apparatus 100 and the base station apparatus 200 (S31).

  Next, when the value of the electric field strength of the radio wave between the mobile terminal 50 and the base station device 200 received from the electric field strength measurement unit 220 has reached a predetermined threshold value (S33: Yes) ) The base station apparatus 100 is notified of the fact that it is possible to make a call (S34), and the communication service is switched from the communication service company A to the communication service company B (S35).

  FIG. 8 is a display example in the mobile terminal during switching from the communication service of the communication service company A to the communication service of the communication service company B in the present embodiment.

  As described above, by using the wireless communication system 5 according to the present embodiment, even when the user moves using the mobile terminal and moves out of the service area of the communication service company, the disconnection of the line is avoided. It is possible to realize a wireless communication system that enables continuous phone calls.

(Embodiment 2)
In the first embodiment, the example of the wireless communication system that avoids disconnection of the line even when the user moves out of the service area of the communication service company because the user moves while using the mobile terminal has been described. In the embodiment, even if the user who uses the mobile terminal is disconnected from the service area 10 of the communication service company A and the line is disconnected, the wireless communication system that automatically performs the redial operation is implemented. An example will be described. The basic functional configuration of the radio communication system in the present embodiment is the same as that of radio communication system 5 in the first embodiment, and a description thereof will be omitted.

  FIG. 9 is a flowchart showing a processing flow of base station apparatus 100 in the present embodiment.

  For example, when Mr. X who is a user of the mobile terminal 50 calls Mr. Y in the service area 10 (that is, via the communication service company A) and establishes a line (S10), the call connection processing unit 130 The measurement result of the electric field strength of the radio wave between the mobile terminal 50 and the base station device 100 from the electric field strength measuring unit 120 is periodically received (S11). If the value of the electric field strength falls below a predetermined threshold (S12: Yes), the call connection processing unit 130 specifies the telephone number 32 in the communication service company B of Mr. X who is the user of the mobile terminal 50. At the same time (S20), the current telephone number 41 of Mr. Y who is the other party of Mr. X (that is, communication service company A) is specified (S21).

  Thereafter, the call connection processing unit 130 notifies the specified telephone number 32 and telephone number 41 to the base station apparatus 200 (S22), and disconnects the line with the mobile terminal 50 (S40: Yes).

  Further, the call connection processing unit 130 notifies the base station apparatus 200 that the line has been disconnected between the mobile terminal 50 and the base station apparatus 100 (S41).

  FIG. 10 is a flowchart showing a process flow of base station apparatus 200 in the present embodiment.

  First, the call connection processing unit 230 of the base station apparatus 200 receives the telephone number 32 and the telephone number 41 from the base station apparatus 100 (S30: Yes), and the base station apparatus 100 disconnects the line with the mobile terminal 50. When the notification of the effect is received (S50: Yes), when the value of the electric field strength of the radio wave of the mobile terminal 50 received from the electric field strength measuring unit 220 has reached a predetermined threshold (S33: Yes), the above Using the telephone number 32 and the telephone number 41, the process of switching the communication service from the communication service company A to the communication service company B (that is, redial process) is automatically performed (S35).

  As described above, even if the user using the mobile terminal 50 is out of the service area 10 of the communication service company A by the wireless communication system according to the present embodiment, the service of the communication service company B When the user moves into the area 20, a redial operation is automatically performed, so that the user does not need to perform a troublesome operation, and an easy-to-use wireless communication system can be realized.

  In the above-described second embodiment, an example in which a call is made between mobile phones has been described. However, the communication form is not limited to a call and may be data transmission. Also in this case, similarly to the above-described call, it is possible to avoid the data transmission re-operation due to the interruption of the data transmission due to the movement of the user and the interruption of the data transmission. For example, each time a certain amount of data (for example, 1 Mbyte) is transmitted in the transmission period, transmission information representing this amount of data is stored in the sending base station apparatus. If the data transmission is interrupted due to a disconnection in the middle of the transmission, transmission information representing the amount of data that has been transmitted from the sending base station device to the receiving base station device is transmitted. The data transmission is resumed on the basis of the transmission of the unsent data.

  In the first embodiment and the second embodiment, a mobile phone is used as an example of the mobile terminal 50. However, the mobile phone 50 is not limited to a mobile phone, and may be a device for data communication such as a PDA (Personal Digital Assistant). There may be.

  Furthermore, it is also possible to perform data transmission using the wireless communication system in the second embodiment. In this case, efficient data transmission after resuming data transmission is performed by successively monitoring the data transmission amount. Can be made possible.

  In the first and second embodiments described above, the example in which communication is performed using a telephone number has been described. However, the present invention is not limited to a telephone number and is applicable to communication such as mail using a URL address. It is possible.

  INDUSTRIAL APPLICABILITY The present invention can be used in a wireless communication system including a mobile terminal that moves as a user moves, and in particular, a wireless that can avoid disconnection of a line even when moving between service areas of a plurality of communication service companies. It can be applied as a communication system.

1 is a diagram showing an outline of a wireless communication system in a first embodiment. 3 is a block diagram illustrating functional configurations of a base station device of a communication service company A and a base station device of a communication service company B in Embodiment 1. FIG. It is a figure which shows an example of each telephone number of the mobile terminal which the user in telephone in this Embodiment possesses. It is a schematic diagram for demonstrating a mode that the electric field strength of a mobile terminal changes with a user's movement. 4 is a flowchart showing a flow of processing of a base station apparatus according to communication service company A in Embodiment 1. It is a flowchart which shows the content of the signaling bypass process in the said FIG. 6 is a flowchart showing a process flow of a base station apparatus according to communication service company B in the first embodiment. 6 is a display example on a mobile terminal that is switching from a communication service of a communication service company A to a communication service of a communication service company B in the first embodiment. 6 is a flowchart showing a flow of processing of a base station apparatus in a communication service company A according to Embodiment 2. 6 is a flowchart showing a flow of processing of a base station apparatus in a communication service company B according to Embodiment 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Public line 5 Wireless communication system 10 Service area 20 Service area 50 Mobile terminal 100 Base station apparatus 110 Transmission / reception control part 120 Electric field strength measurement part 130 Call connection processing part 140 Storage part 141 Charging DB
142 Traffic DB
150 Connection Control Unit 151 Call Control Unit 152 Bypass Control Unit 200 Base Station Device 210 Transmission / Reception Control Unit 220 Electric Field Strength Measurement Unit 230 Call Connection Processing Unit 240 Storage Unit 241 Billing DB
242 Traffic DB

Claims (11)

Electric field strength acquisition means for acquiring electric field strength of radio waves used between the mobile terminal communicating with the first communication mode in the first communication area and the device;
Electric field strength determining means for determining whether or not the electric field strength acquired by the first electric field strength acquiring means is smaller than a first reference value;
When the electric field intensity determining means determines that the electric field intensity is smaller than the first reference value, the mobile terminal communicating with the communication partner terminal via the apparatus and the second adjacent to the first communication area A base station apparatus comprising: connection control means for performing control for communicating with the mobile terminal that has moved into a communication area with respect to another base station apparatus in the second communication area. The base station device further includes:
First information acquisition means for acquiring communication information of the mobile terminal in the first communication area;
Second information acquisition means for acquiring communication information of the communication partner terminal,
The connection control means uses the mobile terminal communication information acquired by the first information acquisition means and the communication counterpart terminal communication information acquired by the second information acquisition means to use the mobile terminal. The base station apparatus according to claim 1, wherein control is performed to cause a terminal and the communication partner terminal to communicate with each other via the other base station apparatus. The communication information is
The base station apparatus according to claim 2, wherein the base station apparatus is a telephone number or a URL address. The electric field strength acquisition means further includes
Obtaining the electric field strength of the radio wave used between the mobile terminal that has flowed in and the device in the second communication area;
The electric field strength determination means further includes
Determining whether or not the electric field intensity acquired by the electric field intensity acquisition means has reached a second reference value;
The connection control means further includes
Performing control for disconnecting communication between the mobile terminal and another base station apparatus in the first communication area when the electric field intensity determination unit determines that the electric field intensity has reached the second reference value; The base station apparatus according to claim 1. The base station device further includes:
When the control is performed by the connection control means when a part of the first communication area and a part of the second communication area overlap,
(1) Until the electric field intensity acquired by the electric field intensity acquiring unit reaches the second reference value, the other base station from the mobile terminal and the communication counterpart terminal until it is determined by the electric field intensity determining unit While not outputting the voice data communicated through the device,
(2) When the electric field strength determination unit determines that the electric field strength acquired by the electric field strength acquisition unit has reached the second reference value, the other base station device from the mobile terminal and the communication counterpart terminal The base station apparatus according to claim 4, further comprising third control means for outputting voice data communicated via the base station. The electric field strength acquisition means is
The base station apparatus according to claim 4, wherein the electric field intensity measured by electric field intensity measuring means for measuring electric field intensity included in the apparatus or the mobile terminal is acquired. First communication means for communicating with a communication partner terminal via the first base station device in the first communication mode in the first communication area;
A mobile terminal comprising: a second communication unit configured to communicate with the communication partner terminal via a second base station apparatus in a second communication mode in a second communication area. The second communication means further includes
Even when the first communication means communicates with a communication partner terminal via the first base station device, the first communication means communicates with the communication partner terminal via the second base station device. The mobile terminal according to claim 7. The mobile terminal further includes:
When the first communication means communicates with the communication counterpart terminal via the first base station apparatus, and the second communication means communicates with the communication counterpart terminal via the second base station apparatus, The mobile terminal according to claim 7, further comprising an output control unit that outputs only one of the audio data received by the first communication unit and the second communication unit. A wireless communication system comprising a first base station device, a second base station device, and a mobile terminal,
The first base station apparatus
First electric field strength acquisition means for acquiring electric field strength of radio waves used between the mobile terminal communicating in the first communication form in the first communication area and the first base station device;
First determination means for determining whether the electric field intensity acquired by the first electric field intensity acquisition means is smaller than a first reference value;
When the electric field strength is determined to be smaller than the first reference value by the first determination means, the mobile terminal flows into the second communication area with the communication counterpart terminal communicating with the first base station apparatus. First control means for performing control for communicating with the mobile terminal on the second base station device in the second communication area,
The mobile terminal
First communication means for communicating with a communication partner terminal via the first base station device in the first communication mode in the first communication area;
A wireless communication system, comprising: a second communication unit that communicates with the communication partner terminal via a second base station apparatus in a second communication mode in a second communication area. Transmission amount acquisition means for sequentially acquiring the amount of data already transmitted between the mobile terminal and the communication partner terminal of the communication partner that communicates via the device in the first communication mode in the first communication area;
Interruption determining means for determining whether communication between the mobile terminal and the local area is interrupted in the first communication area;
When communication is determined by the interruption determination means, based on the acquired information indicating the transmitted data amount, the communication counterpart terminal and the second communication area that is adjacent to the first communication area are transferred to the communication terminal. A base station apparatus comprising: connection control means for performing control for transmitting only untransmitted data in communication with a mobile terminal to another base station apparatus in the second communication region.

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