Management device and management method

Abstract

To make an incoming call terminal properly start the incoming call operation.SOLUTION: A management device includes a call information detection unit that detects call information, a call target identification unit that identifies a terminal device to be called on the basis of the call information, a base station identification unit that identifies a base station device that communicates with the terminal device, a call control unit that instructs the base station device to call the terminal device, a location registration change requesting unit that instructs a different base station device to change the location registration when the base station device satisfies a predetermined condition to the terminal device, and a location registration detection unit that detects the location registration application sent from the terminal device.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a management device and a management method. [Background technology]

[0002] There is a known technology for switching the base station to which registration is made depending on the communication status of the base station, etc. For example, Patent Document 1 describes a mobile terminal that, when a base station is busy, searches for other base stations and switches to a base station that is available for communication and communicates with the other base station. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-163428 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in the prior art documents, when a calling terminal of the calling side starts a call, if the base station that has registered the location of the called terminal of the called side is busy, the called terminal may not be able to properly start the incoming call operation.

[0005] An object of the present invention is to provide a management device and a management method that can cause a called terminal to appropriately start a call receiving operation. [Means for solving the problem]

[0006] The management device of the present invention comprises a call information detection unit that detects call information, a call target identification unit that identifies a terminal device to be called based on the call information, a base station identification unit that identifies a base station device that communicates with the terminal device, a call control unit that instructs the base station device to call the terminal device, a location registration change request unit that instructs the terminal device to change its location registration to a different base station device when the base station device meets a specified condition, and a location registration detection unit that detects a location registration application sent from the terminal device.

[0007] The management method of the present invention includes the steps of detecting call information, identifying a terminal device to be called based on the call information, identifying a base station device that communicates with the terminal device, instructing the base station device to call the terminal device, instructing the terminal device to change its location registration to a different base station device if the base station device meets a specified condition, and detecting a location registration application sent from the terminal device. Effect of the Invention

[0008] According to the present invention, it is possible to cause the called terminal to appropriately start an incoming call operation. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system according to an embodiment. [Diagram 2] FIG. 2 is a diagram for explaining an outline of a communication method of the wireless communication system according to the embodiment. [Diagram 3] FIG. 3 is a sequence diagram showing a processing flow of the wireless communication system according to the embodiment. [Figure 4] FIG. 4 is a diagram for explaining the registration information. [Diagram 5] FIG. 5 is a diagram for explaining the base station information. [Figure 6] FIG. 6 is a diagram for explaining the registration information. [Figure 7] FIG. 7 is a block diagram illustrating an example of the configuration of a management device according to the embodiment. [Figure 8] FIG. 8 is a block diagram showing the configuration of a terminal device according to the embodiment. [Figure 9] FIG. 9 is a flowchart illustrating an example of a process flow of the management device according to the embodiment. [Figure 10] FIG. 10 is a diagram for explaining the location information. [Figure 11] FIG. 11 is a flowchart illustrating an example of a processing flow of the terminal device according to the embodiment. [Figure 12] FIG. 12 is a sequence diagram illustrating an example of a processing flow of the wireless communication system according to the first modified example of the embodiment. [Figure 13] FIG. 13 is a flowchart illustrating an example of a process flow of a management device according to a first modified example of the embodiment. [Figure 14] FIG. 14 is a sequence diagram illustrating an example of a processing flow of the wireless communication system according to the second modified example of the embodiment. [Figure 15] FIG. 15 is a flowchart illustrating an example of a process flow of a management device according to a second modified example of the embodiment. [Figure 16] FIG. 16 is a sequence diagram illustrating an example of a processing flow of a wireless communication system according to the third modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiment described below.

[0011] [Embodiment] <Wireless communication system> The configuration of a wireless communication system according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of the configuration of a wireless communication system according to an embodiment.

[0012] As shown in FIG. 1, the wireless communication system 1 includes a management device 10, a base station device 12a, a base station device 12b, a base station device 12c, a terminal device 14a, a terminal device 14b, and a terminal device 14c. The base station device 12a, the base station device 12b, and the base station device 12c may be collectively referred to as a base station device 12 or a base station device. The terminal device 14a, the terminal device 14b, and the terminal device 14c may be collectively referred to as a terminal device 14 or a terminal device. In the embodiment, the number of the base station devices 12 is described as three, but is not limited thereto. The number of the base station devices 12 may be more or less than three. In the embodiment, the number of the terminal devices 14 is described as three, but is not limited thereto. The number of the terminal devices 14 may be more or less than three. The wireless communication system 1 is, for example, a wireless communication system for business use, but is not limited thereto.

[0013] The management device 10 and the base station device 12 are connected to each other so that they can communicate with each other via a wireless or wired network N. The management device 10 controls the base station device 12. The management device 10 controls the base station device 12 to control various communications including voice communications between the terminal device 14a and the terminal device 14c. In this embodiment, the management device 10 controls the base station device 12 to appropriately start a call receiving operation at a called terminal that has received a voice signal from another terminal device among the terminal devices 14a and 14c.

[0014] An outline of a communication method of the wireless communication system according to the embodiment will be described with reference to Fig. 2. Fig. 2 is a diagram for explaining an outline of the communication method of the wireless communication system according to the embodiment. In Fig. 2, the management device 10 is omitted.

[0015] As shown in Fig. 2, the communication range of base station device 12a is range Ra, the communication range of base station device 12b is range Rb, and the communication range of base station device 12c is range Rc. The common range of range Ra and range Rb is range Rab, and the common range of range Rb and range Rc is range Rbc. Terminal device 14a is located within range Ra. Terminal device 14b is located within range Rb. Terminal device 14c is located within range Rc. Terminal device 14c is located within range Rbc, which is an overlapping area of ​​range Rb and range Rc.

[0016] The base station device 12a, the base station device 12b, and the base station device 12c configure a multi-site. In the wireless communication system 1, the management device 10 is configured to be able to control the base station device 12a, the base station device 12b, and the base station device 12c.

[0017] In Fig. 2, terminal device 14a registers its location with base station device 12a. Terminal device 14b registers its location with base station device 12b. Terminal device 14c registers its location with base station device 12c. Terminal device 14a uses base station device 12a to perform group communication between terminal device 14b and terminal device 14c. Terminal device 14b uses base station device 12b to perform group communication between terminal device 14a and terminal device 14c. Terminal device 14c uses base station device 12c to perform group communication between terminal device 14a and terminal device 14b.

[0018] [Processing of wireless communication system] The flow of processing in the wireless communication system according to the embodiment will be described with reference to Fig. 3. Fig. 3 is a sequence diagram showing the flow of processing in the wireless communication system according to the embodiment.

[0019] The terminal device 14a applies for location registration to the base station device 12a, and the base station device 12a registers the location of the terminal device 14a (step S2). The terminal device 14b applies for location registration to the base station device 12b, and the base station device 12b registers the location of the terminal device 14b (step S4). The terminal device 14c applies for location registration to the base station device 12c, and the base station device 12c registers the location of the terminal device 14c (step S6). The management device 10 detects and stores the terminal devices that have registered their locations with the base station device in response to the application from the terminal device. Here, it is assumed that all communication channels used for calls by the base station device 12c are in use, that is, are in a busy state (step S8). In this case, the management device 10 determines that the base station device 12c is in a busy state.

[0020] FIG. 4 is a diagram for explaining registration information. FIG. 4 shows registration information 26A of the base station device 12 registered in the terminal device 14 by the processing of steps S2 to S6. As shown in FIG. 4, the base station device 12a is registered in the terminal device 14a. The base station device 12b is registered in the terminal device 14b. The base station device 12c is registered in the terminal device 14c. The management device 10 stores the registration information 26A as shown in FIG. 4 in the storage unit 26. That is, the management device 10 can grasp the base station device 12 registered by each terminal device 14 included in the wireless communication system 1 based on the registration information 26A.

[0021] FIG. 5 is a diagram for explaining base station information. FIG. 5 shows base station information 26B related to the communication channel of the base station device 12 by the process of step S8. As shown in FIG. 5, the base station device 12a shows that the communication channel is available. The base station device 12b shows that the communication channel is available. The base station device 12c shows that the communication channel is not available. In other words, the base station device 12c shows that it is busy. The management device 10 stores the base station information 26B as shown in FIG. 5 in the storage unit 26. In other words, the management device 10 can grasp the state of the communication channel of the base station device 12 included in the wireless communication system 1 based on the base station information 26B.

[0022] Returning to FIG. 3, the terminal device 14a transmits a call control request to the base station device 12a (step S10). That is, the terminal device 14a transmits a request to start group communication. The base station device 12a receives the call control request. The management device 10 receives the call control request for the terminal device 14a from the base station device 12a and identifies the terminal device 14c to be called. The management device 10 identifies the base station device 12c that has registered the location of the terminal device 14c. The management device 10 instructs the base station device 12c to issue a location registration change request to the terminal device 14c whose location is currently registered.

[0023] The base station device 12c transmits a location registration change request to the terminal device 14c (step S12). That is, since the base station device 12c is busy and cannot transmit a call control request to the terminal device 14c, the base station device 12c transmits a request to change the location registration to the terminal device 14c.

[0024] The terminal device 14c performs location registration with the base station device 12b (step S14). The terminal device 14c performs location registration with the base station device 12b, which is an adjacent base station device to the base station device 12c.

[0025] FIG. 6 is a diagram for explaining registration information. FIG. 6 shows registration information 26Aa of base station device 12 registered in terminal device 14 by the process of step S14. As shown in FIG. 6, base station device 12a is registered in terminal device 14a. Base station device 12b is registered in terminal device 14b. Base station device 12b is registered in terminal device 14c. That is, terminal device 14c changes the base station for location registration from base station device 12c to base station device 12b. Note that management device 10 also stores registration information 26Aa after the change.

[0026] Returning to FIG. 3, the base station device 12b transmits a call control request to the terminal device 14c (step S16). The terminal device 14c starts receiving signals from the base station device 12b in response to the call control request. The terminal device 14a transmits a voice signal to the base station device 12a to start a group call (step S18). The base station device 12a transmits the voice signal received from the terminal device 14a to the base station device 12b (step S20). The base station device 12b transmits the voice signal received from the base station device 12a to the terminal devices 14b and 14c (step S22). The group communication is started by the processing of steps S18 to S22. In this case, the terminal device 14a is called a calling terminal, and the terminal devices 14b and 14c are called called terminals. The start of the group communication is detected by the management device 10.

[0027] When group communication is to be started from the terminal device 14b or the terminal device 14c, the processes from step S18 to step S22 are carried out in reverse order.

[0028] The terminal device 14a, the terminal device 14b, and the terminal device 14c end the group call (step S24). In other words, the management device 10 detects the end of the group call.

[0029] The terminal device 14c registers its location with the base station device 12c (step S26). That is, the terminal device 14c registers its location with the base station device 12c, which was registered before starting the group communication, instead of the base station device 12b, which was changed during the group communication. In this embodiment, the base station device 12, which was registered with the terminal device 14 before starting the group communication, is called the first base station device, and the base station device 12, which was changed and registered with the location when starting the group communication, is called the second base station device.

[0030] [Management device configuration] A configuration example of a management device according to an embodiment will be described with reference to Fig. 7. Fig. 7 is a block diagram showing a configuration example of a management device according to an embodiment.

[0031] As shown in FIG. 7, the management device 10 includes a communication unit 20, an operation unit 22, a display unit 24, a storage unit 26, and a control unit .

[0032] The communication unit 20 communicates with an external device via a wireless or wired network. The communication unit 20 communicates with the base station device 12, for example.

[0033] The operation unit 22 accepts various operations for the terminal device 14. For example, the operation unit 22 accepts operations for starting or ending communication with other wireless communication devices, etc. The operation unit 22 includes, for example, a mouse, a keyboard, buttons, switches, a lever, a numeric keypad, a touch panel, etc.

[0034] The display unit 24 displays various types of information. For example, the display unit 24 displays information related to the state of the base station device 12. The display unit 24 includes a display including, for example, a liquid crystal display (LCD) or an organic electro-luminescence (EL) display. The display unit 24 includes, for example, a light-emitting unit such as an LED (Light Emitting Diode). The display unit 24 may be integrated with the operation unit 52 by using a touch panel or the like as the operation unit 22.

[0035] The storage unit 26 is a memory that stores various information. The storage unit 26 stores information such as the calculation contents and programs of the control unit 28. The storage unit 26 stores, for example, information about the base station device 12 in which each terminal device 14 included in the wireless communication system 1 has registered its location. The storage unit 26 stores, for example, information about the base station device 12 adjacent to the base station device 12 in which each terminal device 14 included in the wireless communication system 1 has registered its location. The storage unit 26 stores, for example, information about the channel usage status of each base station device 12 included in the wireless communication system 1. The storage unit 26 stores, for example, information about the base station device 12 in a busy state among each base station device 12 included in the wireless communication system 1. The storage unit 26 includes, for example, at least one of a random access memory (RAM), a main storage device such as a read only memory (ROM), and an external storage device such as a hard disk drive (HDD).

[0036] The control unit 28 controls the operation of each unit of the management device 10. The control unit 28 is realized, for example, by a central processing unit (CPU) or a micro processing unit (MPU) executing a program stored in the storage unit 26 or the like using a RAM or the like as a working area. The control unit 28 may be realized, for example, by an integrated circuit such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA). The control unit 28 may be realized by a combination of hardware and software.

[0037] The control unit 28 includes a call information detection unit 30, a call target identification unit 32, a base station identification unit 34 (first base station identification unit 34a and second base station identification unit 34b), a location registration change request unit 36, a location registration detection unit 38, a call control unit 40, and a call detection unit 42.

[0038] The call information detection unit 30 detects call information from the calling terminal device 14. The call information detection unit 30 detects, for example, the start of a group call from the calling terminal device 14.

[0039] The call target identification unit 32 identifies a call target of the calling side terminal device 14. The call target identification unit 32 identifies the called side terminal device 14 that is the target of the group call, for example, based on call information from the calling side terminal device 14.

[0040] The base station identification unit 34 identifies a base station device that communicates with the terminal device. The first base station identification unit 34a of the base station identification unit 34 identifies the base station device 12 that has registered the location of the terminal device 14 as the first base station device. For example, the first base station identification unit 34a identifies the base station device 12 with which the terminal device 14 identified by the call target identification unit 32 has already registered its location as the first base station device. The first base station identification unit 34a may determine whether or not there is an available communication channel of the identified first base station device. If there is an available call channel of the first base station device, the first base station device is instructed to issue an instruction (call control request) to call the terminal device 14 from the first base station device.

[0041] The second base station identifying unit 34b of the base station identifying unit 34 identifies a second base station device that, unlike the first base station device, has not registered the location of the terminal device 14. For example, when there is no available communication channel of the first base station device identified by the first base station identifying unit 34a, the second base station identifying unit 34b identifies a base station device 12 that is adjacent to the first base station device and has an available communication channel as the second base station device.

[0042] When the second base station identification unit 34b identifies a second base station device, the location registration change request unit 36 ​​causes the first base station device to transmit a request to change the location registration to the second base station device to the terminal device 14 that has registered its location with the first base station device. The request to change the location registration may be an instruction to the second base station device to make a temporary change, or may be an instruction to maintain the change of the location registration to the second base station device.

[0043] The location registration detection unit 38 detects a location registration application from the terminal device 14 in response to a location registration change request made by the location registration change request unit 36 ​​.

[0044] When the location registration detection unit 38 detects a location registration application from the terminal device 14, the call control unit 40 instructs the second base station device to issue an instruction (call control request) to call the terminal device 14 from the second base station device.

[0045] The call detection unit 42 detects various information related to calls between the terminal devices 14 included in the wireless communication system 1. The call detection unit 42 detects, for example, the start of a call between the terminal devices 14. The call detection unit 42 detects, for example, the end of a call between the terminal devices 14. The call detection unit 42 may be configured to detect, for example, the end of at least a call between the terminal devices 14.

[0046] [Terminal device configuration] A configuration example of a terminal device according to an embodiment will be described with reference to Fig. 8. Fig. 8 is a block diagram showing the configuration of a terminal device according to an embodiment.

[0047] 8, the terminal device 14 includes a communication unit 50, an operation unit 52, a microphone 54, a speaker 56, a display unit 58, a position detection unit 60, a storage unit 62, and a control unit 64. The terminal device 14 includes, but is not limited to, a portable wireless communication device, a smartphone, a tablet terminal, and the like.

[0048] The communication unit 50 has a function of performing long-distance wireless communication. Examples of long-distance wireless communication include digital business radio such as APCO-P25 (Association of Public safety Communications Officials international Project 25) and NXDN (registered trademark). The long-distance wireless communication may be communication via a mobile phone network or the like.

[0049] The operation unit 52 accepts various operations for the terminal device 14. For example, the operation unit 52 accepts operations for starting group communication with other terminal devices 14 or ending group communication. The operation unit 52 includes, for example, buttons, switches, levers, a numeric keypad, a touch panel, and a PTT (Push to Talk) button.

[0050] The microphone 54 picks up sounds around the terminal device 14. The microphone 120 picks up, for example, the user's voice and converts it into an electrical signal. The microphone 54 outputs the voice converted into an electrical signal to the control unit 64 as a voice call signal. The speaker 56 outputs various sounds. For example, the speaker 56 outputs an audio signal received from another terminal device 14 as audio.

[0051] The display unit 58 displays various types of information. For example, the display unit 58 displays various types of information related to the state of the terminal device 14 and the communication status. The display unit 58 includes a display including, for example, a liquid crystal display or an organic EL display. The display unit 58 includes, for example, a light emitting unit such as an LED. The display unit 58 may be integral with the operation unit 52 by using a touch panel or the like as the operation unit 52.

[0052] The position detection unit 60 receives a GNSS signal from a Global Navigation Satellite System (GNSS) satellite (not shown). The position detection unit 60 outputs the received GNSS signal (information for identifying position information) to the control unit 64. The position detection unit 60 can be realized by, for example, a GNSS receiving circuit or a GNSS receiving device.

[0053] The storage unit 62 is a memory that stores various types of information. The storage unit 62 stores information such as the calculation contents and programs of the control unit 64. The storage unit 62 stores, for example, information about the base station device 12 whose location is registered by the terminal device 14. The storage unit 62 stores, for example, information about the base station device 12 adjacent to the base station device 12 whose location is registered by the terminal device 14. The storage unit 62 includes, for example, at least one of a RAM, a main storage device such as a ROM, and an external storage device such as an HDD.

[0054] The control unit 64 controls the operation of each unit of the terminal device 14. The control unit 64 is realized, for example, by a CPU, an MPU, or the like executing a program stored in the storage unit 62 or the like using a RAM or the like as a working area. The control unit 64 may be realized, for example, by an integrated circuit such as an ASIC or an FPGA. The control unit 64 may be realized by a combination of hardware and software.

[0055] The control unit 64 calculates the current position of the terminal device 14 using a known method, for example, based on the GNSS signal received by the position detection unit 60. The control unit 64 calculates the current position of the terminal device 14 in earth coordinates, for example. The control unit 64 transmits position information related to the calculated current position of the terminal device 14 to the management device 10 via the communication unit 50.

[0056] [Management device processing] The process of the management device according to the embodiment will be described with reference to Fig. 9. Fig. 9 is a flowchart showing an example of the flow of the process of the management device according to the embodiment.

[0057] The call information detection unit 30 detects call information (step S100). Specifically, the call information detection unit 30 detects information indicating the start of a group call based on the call information included in the call control request transmitted by the calling terminal device 14. Then, the process proceeds to step S102.

[0058] The call target identification unit 32 identifies the terminal device 14 to be called (step S102). Specifically, the call target identification unit 32 identifies the terminal device 14 on the called side to be called based on the call information transmitted by the terminal device 14 on the calling side. Then, the process proceeds to step S104.

[0059] The first base station identifying unit 34a identifies the first base station device (step S104). The first base station identifying unit 34a identifies the base station device 12 in which the terminal device 14 of the called side identified by the call target identifying unit 32 has registered its location. Specifically, the first base station identifying unit 34a identifies the base station device 12 in which the terminal device 14 of the called side has registered its location, based on the registration information 26A stored in the storage unit 26 and the like. Then, the process proceeds to step S106.

[0060] The first base station identifying unit 34a judges whether the first base station device with which the identified called terminal device 14 has registered its location is in a busy state (step S106). The first base station identifying unit 34a judges whether the first base station device is in a busy state based on whether the first base station device has an available communication channel. Specifically, the first base station identifying unit 34a judges the first base station device to be in a busy state when the first base station device has no available communication channel. If it is judged that the first base station device is in a busy state (step S106; Yes), the process proceeds to step S108. If it is judged that the first base station device is not in a busy state (step S106; No), the process proceeds to step S118.

[0061] If the result of the determination in step S106 is Yes, the second base station identifying unit 34b identifies the second base station device (step S108). The second base station identifying unit 34b identifies the base station device 12 adjacent to the first base station device determined to be in a busy state in step S106 as the second base station device. The second base station identifying unit 34b may identify the second base station device based on, for example, location information of each terminal device 14.

[0062] FIG. 10 is a diagram for explaining the position information. FIG. 10 shows the current position information 26C of each terminal device 14. The position information of each terminal device 14 may be indicated in earth coordinates such as (latitude, longitude). The position information of the terminal device 14a is, for example, (La1, Lo1). The position information of the terminal device 14b is, for example, (La2, Lo2). The position information of the terminal device 14c is, for example, (La3, Lo3). The management device 10 stores the position information 26C as shown in FIG. 10 in the storage unit 26. The position information of each terminal device 14 is transmitted from each terminal device 14 when registering the position in the base station device 12. The second base station identification unit 34b identifies the second base station device based on the position information 26C, for example. The second base station identification unit 34b identifies, for example, the base station device 12 located closest to the current position as the second base station device. In FIG. 10, the latitude and longitude are conceptually shown as (La1, Lo1) to (La3, Lo3), but in reality, the coordinates of the latitude and longitude are indicated by numerical values.

[0063] Return to FIG. 9. After step S108, the second base station identifying unit 34b judges whether the identified second base station device is in a busy state (step S110). The second base station identifying unit 34b refers to the base station information 26B and judges whether the second base station device is in a busy state based on whether the second base station device has an available communication channel. Specifically, when the second base station device has no available communication channel, the second base station identifying unit 34b judges the second base station device to be in a busy state. If it is judged that the second base station device is not in a busy state (step S110; No), the process proceeds to step S112. If it is judged that the second base station device is in a busy state (step S110; Yes), the process proceeds to step S126.

[0064] If the result of the determination in step S110 is No, the location registration change request unit 36 ​​transmits information regarding an instruction to change the location registration to the terminal device 14 that has registered the first base station device in a busy state (step S112). The location registration change request unit 36 ​​transmits information regarding an instruction to change the location registration from the first base station device to the terminal device 14 that has registered its location with the first base station device, for example. Then, the process proceeds to step S114.

[0065] The location registration detection unit 38 judges whether or not a location registration application from the terminal device 14 has been detected (step S114). Specifically, the location registration detection unit 38 judges whether or not a location registration application from the terminal device 14 to the second base station device has been detected. If it is judged that a location registration application from the terminal device 14 has been detected (step S114; Yes), the process proceeds to step S116. If it is judged that a location registration application from the terminal device 14 has not been detected (step S114; No), the process proceeds to step S130.

[0066] If the result of the determination in step S114 is Yes, the location of the terminal device 14 is registered in the second base station device. As a result, the call control unit 40 calls the terminal device 14 from the second base station device (step S116). Then, the process proceeds to step S118.

[0067] The call detection unit 42 detects the start of a call between the terminal devices 14 (step S118). The call detection unit 42 detects the start of a call such as a group call, for example, based on a voice signal transmitted and received between the terminal devices 14. Then, the process proceeds to step S120.

[0068] The call detection unit 42 detects the end of the call between the terminal devices 14 (step S120). The call detection unit 42 determines that the call has ended, for example, when there is no longer any transmission or reception of audio signals between the terminal devices 14. Then, the process proceeds to step S122.

[0069] The location registration detection unit 38 judges whether or not the terminal device 14 has changed its location registration (step S122). Specifically, the location registration detection unit 38 judges whether or not the terminal device 14 has changed its location registration from the first base station device to the second base station device when starting a call. If it is judged that the location registration has been changed (step S122; Yes), the process proceeds to step S124. If it is judged that the location registration has not been changed (step S122; No), the process of FIG. 9 is terminated.

[0070] If the result of the determination in step S122 is Yes, the location registration change request unit 36 ​​transmits information regarding an instruction to change the location registration from the second base station device to the first base station device, to the terminal device 14 (step S124). That is, the location registration change request unit 36 ​​causes the terminal device 14 to perform location registration in the first base station device with which the terminal device 14 had been registered before starting a call. Then, the processing in FIG. 9 ends.

[0071] If the result of the determination in step S110 is Yes, the location registration change request unit 36 ​​transmits information to the terminal device 14 to the effect that the device will wait (step S126). Specifically, the location registration change request unit 36 ​​causes the terminal device 14 to continue the location registration with the first base station device, which is in a busy state. Then, the process proceeds to step S128.

[0072] The control unit 28 judges whether or not a predetermined time has elapsed (step S128). Specifically, the control unit 28 judges whether or not a time has elapsed from when the terminal device 14 waits until a predetermined timeout occurs. If it is judged that the predetermined time has elapsed (step S128; Yes), the process of FIG. 9 is terminated. If it is judged that the predetermined time has not elapsed (step S128; No), the process proceeds to step S110.

[0073] If it is determined No in step S114, the control unit 28 determines whether or not a predetermined time has elapsed (step S130). Specifically, the control unit 28 determines whether or not a predetermined time has elapsed since the terminal device 14 was instructed to change the location registration until a predetermined time-out occurs. If it is determined that the predetermined time has elapsed (step S130; Yes), the process in FIG. 9 is terminated. If it is determined that the predetermined time has not elapsed (step S130; No), the process proceeds to step S114.

[0074] [Terminal device processing] A process flow of the terminal device according to the embodiment will be described with reference to Fig. 11. Fig. 11 is a flowchart showing an example of a process flow of the terminal device according to the embodiment.

[0075] The control unit 64 of the terminal device 14 performs location registration with the first base station device (step S200). Specifically, the control unit 64 performs location registration with the first base station device located within the communication range of the base station device 12 via the communication unit 50. Then, the process proceeds to step S202.

[0076] The control unit 64 determines whether or not a request for changing the location registration has been received (step S202). Specifically, the control unit 64 determines whether or not another terminal device 14 has requested the start of a group call and a request for changing the location registration has been received from the first base station device that is in a busy state. If it is determined that a request for changing the location registration has been received (step S202; Yes), the control unit 64 proceeds to step S204. If it is determined that a request for changing the location registration has not been received (step S202; No), the control unit 64 proceeds to step S208.

[0077] If the result of step S202 is Yes, the control unit 64 judges whether or not there is a second base station device that can be registered (step S204). Specifically, it judges whether or not there is a second base station device that is adjacent to the first base station device and has an available communication channel. If it is judged that there is a second base station device that can be registered (step S204; Yes), the process proceeds to step S206. If it is judged that there is no second base station device that can be registered (step S204; No), the process proceeds to step S216.

[0078] If the result of the determination in step S204 is Yes, the control unit 64 performs location registration with the second base station device (step S206). Specifically, the control unit 64 performs location registration with the second base station device via the communication unit 50. Then, the process proceeds to step S208.

[0079] The control unit 64 detects the start of a group call (step S208). The control unit 64 detects the start of a group call, for example, based on a voice signal transmitted from the second base station device. Then, the process proceeds to step S210.

[0080] The control unit 64 detects the end of the call (step S210). For example, the control unit 64 detects the end of the group call when it has not received a voice signal from the second base station device for a predetermined period of time. Then, the process proceeds to step S212.

[0081] The control unit 64 determines whether the location registration has been changed (step S212). Specifically, the control unit 64 determines whether the registered base station device has been changed from the first base station device to the second base station device when starting a call. If it is determined that the location registration has been changed (step S212; Yes), the control unit 64 proceeds to step S214. If it is determined that the location registration has not been changed (step S212; No), the process of FIG. 11 is terminated.

[0082] If the result of the determination in step S212 is Yes, the control unit 64 performs location registration in the first base station device (step S214). Specifically, the control unit 64 performs location registration from the second base station device, which was registered at the time of the call, to the first base station device, which was registered before the call. Then, the process in FIG. 11 ends.

[0083] If the result of the determination in step S204 is No, the control unit 64 waits (step S216). Specifically, the control unit 64 waits while keeping the location registered in the first base station device. Then, the process proceeds to step S218.

[0084] The control unit 64 determines whether a predetermined time has elapsed (step S218). Specifically, the control unit 64 determines whether a time has elapsed from waiting with the location registered in the first base station device until a predetermined timeout occurs. If it is determined that the predetermined time has elapsed (step S218; Yes), the process of FIG. 11 ends. If it is determined that the predetermined time has not elapsed (step S218; No), the process proceeds to step S216.

[0085] As described above, in this embodiment, when starting group communication, a request to change location registration is transmitted to terminal device 14 that has registered its location with a busy base station device 12. Terminal device 14 that receives the request to change its location registration registers its location with a base station device 12 that is adjacent to the base station device 12 with which it has registered its location and that has an available communication channel. This allows the present embodiment to allow the called terminal device 14 to appropriately receive a call during communication such as a group call.

[0086] Furthermore, in this embodiment, when the group communication ends, the base station device 12 with which the terminal device 14 that has changed its location registration is changed to the base station device 12 with which the terminal device 14 had registered its location before starting the group communication. This allows the terminal device 14 to register its location with the base station device 12 that has a better radio wave environment.

[0087] [First modified example of processing in wireless communication system] Processing of the wireless communication system according to the first modified example of the embodiment will be described with reference to Fig. 12. Fig. 12 is a sequence diagram showing an example of a flow of processing of the wireless communication system according to the first modified example of the embodiment.

[0088] In the process according to the first modified example of the embodiment shown in FIG. 12, the process of the terminal device 14 that changes the location registration with the base station device after the group call between the terminal devices 14 is ended is different from the process of the wireless communication system according to the embodiment.

[0089] 12, after step S24, the terminal device 14c maintains its location registration (step S28). Specifically, after the group communication ends, the terminal device 14c does not register its location with the base station device 12c, but maintains its location registration with the base station device 12b, which was registered during the group communication.

[0090] A process flow of the management device according to the first modified example of the embodiment will be described with reference to Fig. 13. Fig. 13 is a flowchart showing an example of a process flow of the management device according to the first modified example of the embodiment. The process of Fig. 13 differs from the process shown in Fig. 9 in the process when it is determined that "Yes" in step S122.

[0091] If the result of the determination in step S122 is Yes, the location registration change request unit 36 ​​maintains the location registration in the second base station device (step S132). That is, when the end of the group call is detected, the location registration change request unit 36 ​​causes the terminal device 14 to maintain the registration in the second base station device. Then, the process in FIG. 13 ends.

[0092] As described above, in the first modified embodiment, when group communication ends, the base station device 12 that registers the location of the terminal device 14 that has changed its location registration is maintained without being changed even after the group communication ends. As a result, in the first modified embodiment, location registration can be continued in a base station device 12 that has an available communication channel, so that an incoming call operation can be appropriately performed when group communication is continued, for example.

[0093] [Second modified example of processing in wireless communication system] The process of the wireless communication system according to the second modified example of the embodiment will be described with reference to Fig. 14. Fig. 14 is a sequence diagram showing an example of the flow of the process of the wireless communication system according to the second modified example of the embodiment.

[0094] In the process according to the second modified example of the embodiment shown in FIG. 14, the process of the terminal device 14 that changes the location registration with the base station device after the group call between the terminal devices 14 is ended is different from the process of the wireless communication system according to the embodiment.

[0095] 14, after step S24, the terminal device 14c searches for a base station device (step S30). Specifically, after the group communication ends, the terminal device 14c searches for a base station device 12 as a new location registration destination.

[0096] A process flow of a management device according to a second modified example of an embodiment will be described with reference to Fig. 15. Fig. 15 is a flowchart showing an example of a process flow of a management device according to a second modified example of an embodiment. The process of Fig. 15 is different from the process shown in Fig. 9 in the case where it is determined that "Yes" in step S122.

[0097] If the result of the determination in step S122 is Yes, the second base station identifying unit 34b identifies a new second base station device (step S134). Specifically, the second base station identifying unit 34b identifies the base station device 12 closest to the current location of the terminal device 14 or the base station device 12 with the strongest radio wave intensity as the new second base station device, for example, based on the location information 26C stored in the storage unit 26. That is, the second base station identifying unit 34b identifies the base station device 12 with the easiest conditions for communication as the new second base station device. Then, the process proceeds to step S136.

[0098] The second base station identifying unit 34b determines whether or not there is a new second base station device with conditions that make communication easier (step S136). Specifically, the second base station identifying unit 34b determines whether or not there is a new second base station device based on the base station information 26B. If it is determined that there is a new second base station device (step S136; Yes), the process proceeds to step S138. If it is determined that there is no new second base station device (step S136; No), the process proceeds to step S140.

[0099] If the result of the determination in step S136 is Yes, the location registration change request unit 36 ​​transmits information regarding an instruction to change the location registration from the second base station device to the new second base station device, to the terminal device 14 (step S138). That is, the location registration change request unit 36 ​​causes the terminal device 14 to register its location in the new second base station device that has conditions that make it easier for the terminal device 14 to communicate. Then, the processing in FIG. 15 ends.

[0100] If the result of step S136 is No, the location registration change request unit 36 ​​transmits information regarding an instruction to change the location registration from the second base station device to the first base station device to the terminal device 14 (step S140). That is, the location registration change request unit 36 ​​causes the terminal device 14 to register its location with the first base station device with which it had registered its location before starting the call. Note that in step S140, the location registration change request unit 138 may cause the terminal device 14 to maintain its registration with the second base station device. Then, the processing of FIG. 15 ends.

[0101] As described above, in the second modified embodiment, when group communication ends, a search is made for base station device 12 with conditions that are easier for communication. In the second modified embodiment, if a base station device 12 with conditions that are easier for communication is found, the location of that base station device 12 is registered as a new second base station device. As a result, in the second modified embodiment, for example, when a user is making a group call using terminal device 14 while moving, the location of base station device 12 with conditions that are easier for communication can be registered at the point where the group call ends.

[0102] [Third modified example of processing in wireless communication system] Processing of a wireless communication system according to a third modified example of the embodiment will be described with reference to Fig. 16. Fig. 16 is a sequence diagram showing an example of a processing flow of a wireless communication system according to a third modified example of the embodiment.

[0103] The process according to the third modification of the embodiment shown in Fig. 16 shows an example of a process in which, when performing location registration from a first base station device to a second base station device, if the second base station device is in a busy state, the terminal device 14 is made to wait. In this case, the process after step S18 is different from the process in Fig. 3.

[0104] 16, after step S14, the base station device 12b transmits a standby request to the terminal device 14c (step S32). Specifically, since the base station device 12b is busy, the base station device 12b transmits a standby request including information regarding a standby instruction to the terminal device 14c in response to the location registration from the terminal device 14c. Then, the process proceeds to step S34.

[0105] The terminal device 14c waits (step S34). Specifically, the terminal device 14c waits without changing the base station device 12 to be registered with from the base station device 12c in accordance with the standby request. The terminal device 14c repeats the processes of steps S14 and S34 until the location registration with the base station device 12b is completed. Then, the process proceeds to step S36.

[0106] The terminal device 14c times out (step S36). Specifically, if the terminal device 14c is unable to register its location with the base station device 12b for a predetermined period of time, the terminal device 14c times out while maintaining its location registration with the base station device 12c. Then, the process of FIG. 16 ends.

[0107] In the process shown in Fig. 16, the terminal device 14c receives standby supply directly from the base station device 12b whose location registration has been changed, but the present invention is not limited to this. For example, in the present invention, each base station device 12 may periodically broadcast base station information including the usage status of the communication channel. In this case, the terminal device 14c may determine that the base station device 12b is busy based on the base station information broadcast from the base station device 12b and go into standby.

[0108] As described above, in the third variant of the embodiment, when terminal device 14 changes base station device 12 to which it registers its location in order to perform group communication or the like, if base station device 12 to which the location registration is to be changed becomes busy, terminal device 14 can be put on standby.

[0109] Although the embodiments of the present invention have been described above, the present invention is not limited to the contents of these embodiments. The above-described components include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-described components can be appropriately combined. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the above-described embodiments. [Explanation of symbols]

[0110] 1. Wireless communication systems 10 Management device 12 Base station equipment 14 Terminal Equipment 20,50 Communications Department 22,52 Operation section 24,58 Display section 26,62 Storage part 28,64 Control section 30 Call information detection unit 32 Call target identification part 34 Base station identification section 34a 1st base station identification section 34b 2nd base station identification section 36 Location Registration Change Request Department 38 Location registration detection unit 40 Call control section 42 Call detection unit 54 Mike 56 Speaker 60 Position detection unit

Claims

1. A call information detection unit that detects call information; a call target identification unit that identifies a terminal device to be called based on the call information; A base station identification unit that identifies a base station device that communicates with the terminal device; a call control unit that instructs the base station device to call the terminal device; a location registration change request unit that instructs the terminal device to change its location registration to a different base station device when the base station device satisfies a predetermined condition; a location registration detection unit that detects a location registration request transmitted from the terminal device; A call detection unit that detects at least the end of a call on the terminal device; Equipped with the base station identification unit, when there is no available communication channel of the identified first base station device, identifies a second base station device that is adjacent to the first base station device and has an available communication channel; the location registration change request unit instructs the terminal device to change its location registration from the first base station device to the second base station device; the location registration detection unit detects a location registration request from the terminal device in response to an instruction to change the location registration; the call control unit instructs the second base station device to call the terminal device from the second base station device when the application for location registration is detected; When the call detection unit detects the end of the call of the terminal device, the location registration change request unit instructs the second base station device to register the location of the terminal device with the first base station device. Management device.

2. The terminal device has a position detection unit that detects its own position, the management device includes a storage unit configured to store location information regarding the terminal device's own location transmitted from the terminal device when the terminal device registers its location with a base station; the base station identification unit identifies the second base station device based on location information of the terminal device. The management device according to claim 1 .

3. Detecting call information; identifying a terminal device to be called based on the call information; identifying a base station device that communicates with the terminal device, and, when the identified first base station device has no available communication channel, identifying a second base station device that is adjacent to the first base station device and has an available communication channel; instructing the base station device to call the terminal device; instructing the terminal device to change its location registration from the first base station device to the second base station device; detecting an application for location registration from the terminal device based on an instruction for changing the location registration transmitted from the terminal device; a step of instructing the second base station device to call the terminal device from the second base station device when the application for location registration is detected; detecting at least the end of a call on the terminal device; a step of instructing the terminal device from the second base station device to perform location registration with the first base station device when an end of the call of the terminal device is detected; (c) a method of administration;

Images