JP6383996B2 - Terminal device - Google Patents

Description

  The present invention relates to a wireless communication system used in a terminal device, particularly a mobile phone network.

  In the third generation partnership project (3GPP: 3rd Generation Partnership Project), a communication service using LTE (Long Term Evolution) or LTE-Advanced (LTE-A) in an unlicensed band (hereinafter referred to as this communication service) ) Is being considered. The unlicensed band is a frequency band that can be used without requiring authorization from the authorities. An unlicensed band is also called a license-free frequency band. On the other hand, a frequency band that can be used by authorization by an authority is called a licensed band or a frequency band that requires a license. LTE and LTE-A are both representative wireless communication standards. This communication service is to be discussed after 3GPP Release 13.

This communication service can be realized by using a license-free band (for example, 5 GHz band, etc.) that is common throughout the world, even for a communication carrier that does not have a license band. In addition, since this communication service uses a license-free band, it is expected to be provided economically.
On the other hand, the terminal device cannot connect the license band and the license-unnecessary band at the same time. When the terminal device connected to the license band communicates using the license-unnecessary band, the terminal device stops connection with the license band and then shifts to the license-unnecessary band.

3GPP TS 23.122, 3rd Generation Partnership Project, June 2014, V12.5.0)

  However, there is no communication of data transmitted and received between the network of the license band operator that registers the terminal device and assigns the telephone number of each terminal device, and the network of the operator of the license-unnecessary band. For this reason, when the terminal device is connected to a license-unnecessary band, the received data received in the license band cannot be received. In addition, it is conceivable that the terminal device periodically receives the incoming call from the license-free band to the license band. However, the throughput in the license-free band is reduced.

  For example, a carrier that provides a communication service such as a call or data communication using a license band is assumed to be company A, and a communication service such as a call or data communication is provided at a lower price than company A using a license-free band. The carrier is company G. In addition, it is assumed that the user makes a contract with company A having a wider use area, and possesses a terminal device including a SIM (Subscriber Identity Module) card in which business information related to company A is stored. When the connection with the company G becomes possible in the connectable area using the license-free band, the terminal device transitions to the network of the company G. When communication is performed on the G company network, the terminal device is not connected to the license band, and therefore the incoming call is received with the identification number indicated by the company A company information stored in the SIM card. I can't receive it. If the terminal device periodically changes from the G company network to the A company network and refers to the incoming information in the license band, the terminal device can receive the incoming call. However, since the time for which the terminal device is connected to the network of Company G is shortened and the switching process takes time, the throughput of communication in the license-free band is reduced.

  The present invention has been made in view of the above points, and provides a terminal device that can efficiently receive incoming calls, data, and the like addressed to itself while using a network in a license-free band.

The present invention has been made to solve the above-described problems, and one embodiment of the present invention performs a cell search while using a license band provided via a first network to perform a second network. when detecting the unlicensed band is a predetermined frequency band to be provided through, by the first switching control unit for switching to the second network from the network, access method independent protocol destined for the own device An incoming call transfer control unit for requesting an incoming call transfer to a control device that controls outgoing and incoming voice data to and from other devices connected to the first network and connected to the connection device of the first network ; , And receiving voice data addressed to the own device from the control device using the second network according to the protocol .

  According to the present invention, it is possible to efficiently receive incoming calls, data, etc. addressed to the own device while using the network of the license-free band.

It is a conceptual diagram which shows an example of the communication system in the 1st Embodiment of this invention. It is a schematic block diagram which shows the structure of the terminal device which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the incoming call transfer setting process which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the incoming call transfer setting cancellation | release process which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the incoming call transfer setting process which concerns on the 2nd Embodiment of this invention. It is a figure which shows the example of a transfer status storage table. It is a flowchart which shows the incoming call transfer setting process which concerns on the 3rd Embodiment of this invention. It is a flowchart of the incoming call transfer setting cancellation | release process which concerns on the 4th Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram illustrating an example of a communication system 1 in the present embodiment.
The communication system 1 includes base station apparatuses Ua and La, a network connected to each base station apparatus, and a terminal apparatus Tm. An ellipse surrounding each base station apparatus indicates a cell that is a range in which radio waves from each base station apparatus reach. Cells X-Ua and Y-La are cells of base station apparatuses Ua and La, respectively. Cells X-Ua and Y-La may mean base station apparatuses Ua and La, respectively.
The dashed arrows starting from the base station devices Ua and La indicate that each base station device transmits a broadcast signal by radio waves at a predetermined time interval (for example, 50 ms). The notification signal is a signal indicating network system information (System Information). The system information includes provider information indicating individual network operators (operators). A solid-lined double arrow indicates that communication is being performed bidirectionally between the base station apparatus Ua and the terminal apparatus Tm.

  The base station apparatus Ua is a base station apparatus of the business operator X, and is connected to the core network of the business operator X. The business operator X does not have a license band, and provides a communication service to the terminal device Tm using the license unnecessary band by the base station apparatus Ua. The base station apparatus Ua transmits a notification signal indicating that the business operator X is a business operator having a license-unnecessary band using a license-unnecessary band.

  The base station device La is the base station device of the business operator Y, and is connected to the core network of the business operator Y. The business operator Y has a license band, and provides a communication service using the license band by the base station apparatus La. The base station apparatus La transmits a notification signal indicating that the business operator Y is a business operator having a license band using the license band.

  The user of the terminal device Tm has a contract with the operator Y having a license band to receive a communication service provided by the operator Y. The terminal device Tm is equipped with a USIM (Universal Subscriber Identity Module) card or SIM card that stores business information of the business operator Y. In the conventional configuration, the terminal device Tm performs communication using the network (HPLMN: Home Public Land Mobile Network) of the operator Y detected on the license band.

  In the example illustrated in FIG. 1, the terminal device Tm is located in an area where the cells X-Ua and Y-La overlap. At this position, the terminal device Tm detects the network of the operator Y on the license band based on the notification signal transmitted from the base station device La, and operates on the license-unnecessary band based on the notification signal transmitted from the base station device Ua. It is possible to detect the network of the person X. The business operator X provides an economical service using a license-free band. FIG. 1 shows an example in which the user of the terminal device Tm selects the network of the operator X and performs communication on the license-unnecessary band, as indicated by the solid line bidirectional arrow. The terminal device Tm is not connected to the network of the business operator Y when using the communication service of the business operator X using the license-free band. Therefore, with the conventional configuration, even if there is an incoming call addressed to the terminal device Tm on the network of the operator Y, the terminal device Tm cannot receive this incoming call.

In the present embodiment, the core network connected to each of the base station apparatus Ua of the provider X and the base station apparatus La of the provider Y is connected to an IP multimedia sub-system (IMS: IP Multimedia Sub-system). Yes. IP (Internet Protocol) is a typical communication protocol that does not depend on an access method. Therefore, the IMS is configured to include an IMS control device that provides functions such as setting of a transmission path with each terminal device (IMS registration control) and voice outgoing / incoming control regardless of the access method. The IMS control device is, for example, a multimedia telephony application server (MMTelAS: Multi-media Telephony Application Server). The MMTelAS is an application server that transmits and receives multimedia data including audio data using a predetermined protocol (for example, IP). MMTelAS is used for a call service between VoIP terminal devices.
On the other hand, the core network provides functions such as authentication and movement control of each terminal device. The core network is, for example, LTE / EPC (Evolved Packet Core).

  Therefore, the terminal device Tm requests the MMTelAS connected to the core network of the operator Y to set the incoming call forwarding to the own device before starting to use the network of the operator X. Also, the terminal device Tm is set to accept the call transferred to the own device. Further, after receiving the request from the terminal device Tm, the MMTelAS transfers the incoming call addressed to the terminal device Tm to the terminal device Tm using a predetermined protocol (for example, IP). Thereby, even when the terminal device Tm is using the network of the business operator X, the terminal device Tm can receive an incoming call addressed to the own device.

  In the example illustrated in FIG. 1, the number of base station apparatuses is 2 and the number of terminal apparatuses is 1 for the sake of explanation, but the present invention is not limited to this. The number of base station devices may be three or more than three, and the number of terminal devices may be more than one. In addition, the number of license bands and the number of license-unnecessary bands used in the network of the business operator that accommodates the base station apparatus may be greater than one.

(Configuration of terminal device)
Next, the configuration of the terminal device 20 according to the present embodiment will be described.
FIG. 2 is a schematic block diagram illustrating a configuration of the terminal device 20 according to the present embodiment.
The terminal device 20 is an electronic device that can communicate with a counterpart device via a base station device, such as a mobile phone (including a smartphone), a tablet terminal device, a communication card, and the like. The terminal device 20 transmits data via each base station device (for example, the base station devices Ua and La (FIG. 1)) using a license band or a license-unnecessary band like the terminal device Tm (FIG. 1). And can receive.

The terminal device 20 includes a communication unit 21, a control unit 22, and a storage unit 23. The terminal device 20 may include an adapter (not shown) for removably fixing the USIM card.
The communication unit 21 performs communication via a base station device using a predetermined method (for example, LTE, LTE-A).
The communication unit 21 includes M (M is an integer of 1 or larger, for example, 2) first transmission units 211-1 to 211 -M, and M first reception units 212-1. To M-th receiving unit 212-M. In the following description, when there is no particular distinction between the first transmission unit 211-1 to the M-th transmission unit 211 -M, the first transmission unit 211-1 to the M-th reception unit 212-are referred to as the transmission unit 211. When M is not particularly distinguished, it is referred to as a receiving unit 212.

The first transmission unit 211-1 to the M-th transmission unit 211 -M transmit various types of data from the antenna using radio waves using different frequency bands. The first receiving unit 212-1 to the M-th receiving unit 212-M use various frequency bands, and receive various types of data with radio waves having different frequency bands via the antenna.
The frequency bands used by the first transmission unit 211-1 to the M-th transmission unit 211 -M and the first reception unit 212-1 to the M-th reception unit 212 -M include at least one license unnecessary band U 1, U 2,. And at least one license band L1, L2,... The license-unnecessary bands U1, U2,... May be license-free frequency bands defined by a predetermined communication standard. For example, the license unnecessary band U1 is a 5.0 GHz band. The license bands L1, L2,... May be frequency bands that require a license defined by a predetermined communication standard. For example, the license bands L1 and L2 are Band1 (2.0 MHz band) and Band2 (800 MHz band) defined by LTE.
The parts that can be shared by the first transmission unit 211-1 to the M-th transmission unit 211 -M and the first reception unit 212-1 to the M-th reception unit 212 -M may be shared. Further, the parts that can be shared within the frequency band that can be used by the transmission unit 211 and the reception unit 212 may be shared.

  The control unit 22 functions as a switching control unit 221 and an incoming call control unit 222, and executes various processes related to communication. The incoming call control unit 222 includes an incoming call transfer control unit 223 and a terminal VoIP setting unit 224. The control unit 22 includes a processing device such as a CPU (Central Processing Unit) and a main storage device such as a RAM (Random Access Memory).

  The switching control unit 221 detects a network in which the device itself is located by performing a cell search. In the cell search, the switching control unit 221 measures the strength of each frequency band of the received signal received by the receiving unit 212, and detects a signal having a frequency band component whose measured strength is higher than a preset strength. Thereby, the frequency band (band) of the network in which the own apparatus may be located is detected. Further, the switching control unit 221 may detect the network of each business operator based on the business operator number indicated by the business operator information extracted from the notification signal included in the received signal.

  The switching control unit 221 switches from a network that uses a license band to a network that uses a license-unnecessary band or a network that uses a license-unnecessary band to a network that uses a license band according to the detection status of the network. Control. The switching control unit 221 determines that a band in which a received signal is detected within a predetermined frequency band (for example, 5 GHz band) is a license unnecessary band. When detecting the license band, the switching control unit 221 further considers whether the user of the terminal device 20 further has a valid contract related to the communication service with the business operator. The switching control unit 221 detects the license band by comparing the provider information extracted from the received signal with the provider information stored in the SIM card.

  The switching control unit 221 determines whether or not to switch to a license-unnecessary band when the own device is in a network using a license band. The switching control unit 221 switches to a license-unnecessary band when the self-device is located in a network using a license band and is not located in a network using a license-unnecessary band. Is determined not to be performed.

The trigger (trigger) for switching to the license-free band is, for example, the following case.
(A) A license-unnecessary band is found in a cell search (periodic search) performed at a predetermined time interval while using a license band.
(B) When a license-unnecessary band is found in a cell search performed at the start of communication. The start of data communication may be instructed by a user's operation input to the terminal device Tm, or may be instructed by operation of application software installed in the control unit 22.
(C) A case where a license-unnecessary band is found in a cell search performed when the communication volume of data to be transmitted / received increases beyond a predetermined communication volume threshold.

Further, when it is necessary to return to the license band while using the license-unnecessary band, that is, the trigger for switching to the license band is, for example, the following case.
(D) The case where the switch control unit 221 cannot detect the license unnecessary band and the license band is detected during communication using the license unnecessary band. In such a case, for example, during communication, the terminal device 20 moves outside the area where the network of the license-unnecessary band can be used (hereinafter simply referred to as “out of service area”), and the license band is continuously detected. This is the case.
(E) When a license band is detected, switching to the license band is instructed by an operation input of the terminal device Tm by the user.

Whether the incoming call transfer control unit 223 performs incoming call forwarding to the own device by VoIP (VoIP control), or cancels incoming call transfer by VoIP and accepts incoming calls from only the network in the service area (direct control) To control.
When the switching control unit 221 determines that the license band network is in the service area and the transition to the license-unnecessary band is possible, the incoming call transfer control unit 223 uses the license band network in the service area. , VoIP is set for incoming call forwarding to its own device. In the incoming call transfer setting, the incoming call transfer control unit 223 transmits incoming call transfer setting request information to the MMTelAS (not shown) through the network of the license band in the service area. The incoming call forwarding setting request information is information for instructing the setting of the forwarding to the own device and the unconditional incoming forwarding (CFU: Call Forwarding Unconditional) by VoIP, and includes the VoIP number as the identification information of the terminal device 20. The unconditional transfer means that the incoming data is transferred unconditionally without making an incoming call notification to the transfer destination device (calling time 0 second).

  The MMTelAS (not shown) performs call transfer setting for a device designated by the VoIP number included in the call transfer setting request information received from the terminal device 20, and indicates call transfer indicating that the call transfer setting is completed. The setting completion information is transmitted to the terminal device 20. When the incoming call transfer setting is made, when the MMTelAS receives the voice data addressed to the terminal device 20, the MMTelAS transfers the received voice data to the terminal device 20 using IP.

  On the other hand, when it is necessary to return to the license band, the incoming call transfer control unit 223 cancels the incoming call transfer by VoIP. In that case, the incoming call transfer control unit 223 performs an incoming call transfer cancellation setting for the own apparatus by VoIP using the network of the license band in the service area. In the incoming call transfer cancellation setting, the incoming call transfer control unit 223 transmits incoming call transfer setting cancellation request information to the MMTelAS (not shown) via the network of the license band that is in the service area. The incoming call transfer setting release request information is information for instructing to release the setting for the transfer to the own apparatus and unconditional transfer by VoIP.

  The MMTelAS performs call transfer cancellation setting for the terminal device 20 by VoIP based on the call transfer setting cancellation request information received from the terminal device 20, and the call transfer cancellation setting information indicating that the call transfer cancellation setting is completed. Is transmitted to the terminal device 20. When the incoming call transfer cancellation setting is made, the MMTelAS stops the transfer of the voice data addressed to the terminal device 20 using the IP, and the voice data addressed to the terminal device 20 is received only through the network of the license band in the service area. Resume notification.

  After completing the call transfer setting, the terminal VoIP setting unit 224 sets the VoIP function of the own device from an invalid state to an effective state (VoIP setting ON). The terminal VoIP setting unit 224 has a time period from when the incoming call transfer control unit 223 transmits the incoming call transfer setting request information until the incoming call transfer setting completion information is received is less than a predetermined time threshold (for example, 90 seconds). In this case, it is determined that the incoming call transfer setting is completed. Further, the state where the VoIP function is invalid is a state where various types of data can be transmitted / received only via the network in which the device is located. The state in which the VoIP function is valid is a state in which voice data can be transmitted and received using IP. By enabling the VoIP function, even when the terminal device 20 uses a network in a license-unnecessary band, it is possible to receive an incoming call addressed to the own device.

  On the other hand, the terminal VoIP setting unit 224 sets the VoIP function from the valid state to the invalid state after completion of the call transfer cancellation (VoIP setting OFF). The terminal VoIP setting unit 224 has a time from when the incoming call transfer control unit 223 transmits the incoming call transfer cancellation request information until the incoming call transfer cancellation completion information is received is less than a predetermined time threshold (for example, 90 seconds). In this case, it is determined that the incoming call transfer cancellation is completed. When the VoIP function is disabled, when the terminal device 20 uses a license band network, it is possible to stop the transfer to the own device and receive an incoming call only from that network.

Next, incoming call transfer setting processing performed before switching to a license-free band will be described. The terminal device 20 is connected to the license band at the beginning of this process.
FIG. 3 is a flowchart showing the incoming call transfer setting process according to the present embodiment.
(Step S101) The switching control unit 221 performs a cell search to detect a network in which the device is located, and can connect to a license-unnecessary band depending on whether the detected band includes a license-unnecessary band or not. It is determined whether or not. If it is determined that connection is possible (YES in step S101), the process proceeds to step S102. If it is determined that the connection cannot be established (NO in step S101), step S101 is repeated.
(Step S102) The incoming call transfer control unit 223 transmits incoming call transfer setting request information to the MMTelAS via the network (NW) of the license band that is in the service area, so that the incoming call transfer setting for the own device by VoIP is set in the MMTelAS. Request. After the MMTelAS completes the incoming call transfer setting, the process proceeds to step S103.
(Step S103) The incoming call transfer control unit 223 sets the VoIP function of the own device from an invalid state to an effective state (VoIPE setting ON). Proceed to step S104.
(Step S104) The switching control unit 221 connects to the network of the detected license-unnecessary band. Here, the switching control unit 221 transmits the location registration request information to the core network of the license unnecessary band. Then, the process shown in FIG. 3 is complete | finished.
As a result, the terminal device 20 can receive an incoming voice data transmitted by the counterpart device of the communication partner even when the terminal device 20 is in the network of the license-unnecessary band.

Next, an incoming call transfer setting cancellation process that is performed when returning to the license band will be described. It is assumed that the terminal device 20 is connected to a license unnecessary band.
FIG. 4 is a flowchart showing incoming call transfer setting cancellation processing according to the present embodiment.
(Step S201) The switching control unit 221 performs a cell search to detect a network in which the device is located, and whether or not the detected band includes a license band and no license-unnecessary band is included. Therefore, it is determined whether or not it is necessary to return to the license-unnecessary band. If it is determined that a return is necessary (YES in step S201), the process proceeds to step S202. If it is determined that no return is necessary (NO in step S201), step S201 is repeated.

(Step S202) The switching control unit 221 starts connection of the detected license band to the network (moves to the license band). Here, the switching control unit 221 transmits the location registration request information to the core network of the license band and returns to the license band. Thereafter, the process proceeds to step S203.
(Step S203) The incoming call transfer control unit 223 requests the MMTelAS to cancel the incoming call transfer setting addressed to its own device by VoIP by transmitting the incoming call transfer setting release request information to the MMTelAS via the network of the license band that is in the service area. To do. After the MMTelAS completes canceling the incoming call transfer setting, the process proceeds to step S204.
(Step S204) The incoming call transfer control unit 223 sets the VoIP function of the own device from the valid state to the invalid state (VoIP setting OFF). Thereafter, the process shown in FIG.
Thereby, the terminal device 20 cancels the transfer of the audio data to the network of the license-unnecessary band, and can receive the audio data only in the license band.

As described above, the terminal device 20 according to the present embodiment includes the switching control unit 221 that switches from a license band network to a license-unnecessary band network according to the network detection status. In addition, the terminal device 20 transfers the data addressed to the device itself to a predetermined device (for example, the device itself) by using an access method-independent protocol (for example, IP) and the device connected to the license band network. An incoming call transfer control unit 223 is provided for requesting a control device (for example, MMTelAS) that controls outgoing and incoming calls.
With this configuration, even if the network to be used is not switched from the license-unnecessary band network to the license-band network, data (for example, voice data) addressed to the own apparatus is received by a predetermined device. Therefore, it is possible to efficiently receive the data addressed to the own device while using the network of the license-free band.

Further, the terminal device 20 according to the present embodiment includes a setting unit (for example, the terminal VoIP setting unit 224) that enables reception of data according to the protocol, and the incoming call transfer control unit 223 controls transfer to the own device. Request to the device.
With this configuration, even if the network to be used is not switched from the license-unnecessary band network to the license band network, the data destined for the own apparatus is received by the own apparatus. Therefore, it is possible to efficiently receive the data addressed to the own device while using the network of the license-free band.

In the terminal device 20 according to the present embodiment, when the switching control unit 221 switches from the license-unnecessary band network to the license band network according to the network detection status, the incoming call transfer control unit 223 cancels the transfer. Request to controller.
With this configuration, transfer of data addressed to the own device received via the license band network is stopped according to the network detection status (for example, the terminal device 20 is located outside the service providing area of the license-unnecessary band network). Therefore, the data can be reliably received via the license band network.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. About the same structure as embodiment mentioned above, the same code | symbol is attached | subjected and the description is used.
In the communication system 1 according to the present embodiment, the terminal device 20 performs an incoming call transfer setting process after connection with a license-free band, unlike the above-described embodiment.

Next, the incoming call transfer setting process according to the present embodiment will be described. The terminal device 20 is connected to the license band at the beginning of this process.
FIG. 5 is a flowchart showing the incoming call transfer setting process according to the present embodiment.
(Step S301) The switching control unit 221 performs a cell search to detect a network in which the device is located, and can connect to a license-unnecessary band depending on whether the detected band includes a license-unnecessary band. It is determined whether or not. If it is determined that connection is possible (YES in step S301), the process proceeds to step S302. If it is determined that connection is not possible (NO in step S301), step S301 is repeated.
(Step S302) The switching control unit 221 connects to the network of the detected license-free band. After the process related to the connection is completed, the process proceeds to step S303. The switching control unit 221 determines that the process related to the connection is completed by receiving the location registration confirmation information (ACK) within a predetermined time after transmitting the location registration request information to the core network of the license-unnecessary band. To do. Thereafter, the process proceeds to step S303.

(Step S303) The incoming call transfer control unit 223 sets the VoIP function of its own device from an invalid state to an effective state (VoIPE setting ON). Proceed to step S304.
(Step S304) The incoming call transfer control unit 223 transmits incoming call transfer setting request information to the MMTelAS connected to the license band network via the license-unnecessary band network, whereby the incoming call transfer addressed to its own device by VoIP is sent to the MMTelAS. Request settings. After the MMTelAS completes the call transfer setting, the processing shown in FIG.

Specific processing in each of steps S301, S302, S303, and S304 may be the same as the processing in steps S101, S104, S103, and S102. In the incoming call transfer setting process according to the present embodiment, after the connection to the network of the license-unnecessary band is completed, the incoming call transfer control unit 223 enables the VoIP function of the terminal device 20, and the incoming call transfer control unit 223 is addressed to its own device. Request the MMTelAS to set the incoming call transfer. Therefore, the communication service can be received earlier by connecting to the network of the license-unnecessary band than the incoming call transfer setting process shown in FIG.
However, since the incoming call transfer is not performed between the connection to the license-unnecessary band and the completion of the incoming call transfer setting, the time during which the incoming call transfer is not performed becomes longer than the incoming call transfer setting process shown in FIG.

As described above, in the terminal device 20 according to the present embodiment, after the switching control unit 221 completes switching to the network of the license-unnecessary band, the incoming call transfer control unit 223 sets the incoming call transfer setting to the control device ( For example, request to MMTelAS).
With this configuration, it is possible to receive a communication service by the network of the license-unnecessary band earlier than the incoming transfer of the data addressed to the own device to the license band network.

(Third embodiment)
Next, a third embodiment of the present invention will be described. About the same structure as embodiment mentioned above, the same code | symbol is attached | subjected and the description is used.
In the communication system 1 according to the present embodiment, the terminal device 20 can set conditions for incoming call transfer in a license band network in addition to a license-unnecessary band network.

The storage unit 23 of the terminal device 20 stores incoming call transfer setting information (transfer status storage table) relating to incoming call transfer conditions for each network. The incoming call transfer setting information is information including a transfer setting, a transfer number, and a transfer time, for example. The transfer state storage table is formed in association with the network confirmation setting (NW confirmation setting). The network confirmation setting is information indicating whether or not the call transfer setting information is acquired via the connected network. An example of the transfer state storage table will be described later.
The incoming call transfer control unit 223 determines an incoming call transfer condition for each network in accordance with an operation input to the terminal device 20 by the user, and stores the determined incoming call transfer condition in the storage unit 23.

The incoming call transfer control unit 223 refers to the transfer state storage table when it can be connected to the network of the license-unnecessary band, and acquires the network confirmation setting (NW confirmation setting) related to the license band network via the network. Check whether or not In the case where the acquisition is indicated via the network, the incoming call transfer control unit 223 reads the currently set transfer setting information from the MMTelAS (NW transfer setting information confirmation). At that time, the transfer setting information related to the license band network is read by the incoming call transfer control unit 223 of the terminal device 20.
The incoming call transfer control unit 223 stores or updates the read transfer setting information in the storage unit 23.

The incoming call transfer control unit 223 performs incoming call transfer setting request processing when the transfer setting information stored in the storage unit 23 is updated.
In the call transfer setting request processing, the call transfer control unit 223 reads the call transfer setting information related to the network of the license-unnecessary band with reference to the transfer state storage table, and receives the call according to the call transfer condition indicated by the read call transfer setting information. Call transfer setting request information for instructing transfer is generated. The incoming call transfer control unit 223 transmits the generated incoming call transfer setting request information to the MMTelAS (not shown) connected to the license band network via the license unnecessary band network. The MMTel AS performs call transfer setting based on the call transfer setting information indicated by the call transfer setting request information received from the terminal device 20, and transmits call transfer setting completion information indicating that the call transfer setting is completed to the terminal device 20. To do.

  When the terminal device 20 reconnects to the license band network, the incoming call transfer control unit 223 reads the incoming call transfer setting information related to the license band network from the transfer state storage table stored in the storage unit 23. The incoming call transfer control unit 223 performs incoming call transfer setting request processing based on the read incoming call setting information. Here, the incoming call transfer control unit 223 generates incoming call transfer setting request information for instructing incoming call transfer based on the incoming call transfer condition indicated by the read incoming call transfer setting information. The incoming call transfer control unit 223 transmits the generated incoming call transfer setting request information to the MMTelAS (not shown) via the license band network. The MMTelAS performs call transfer setting based on the call transfer setting information indicated by the call transfer setting request information received from the terminal device 20, and transmits call transfer setting completion information indicating that the call transfer setting is completed to the terminal device 20. .

Next, an example of the transfer state storage table will be described.
FIG. 6 is a diagram illustrating an example of a transfer state storage table.
The second column and the third column in FIG. 6 indicate a license band network and a license-unnecessary band network, respectively. The second row shows network confirmation settings, and the third to fifth rows show transfer settings, transfer numbers, and transfer times, which are elements of incoming call transfer setting information.

  The network confirmation setting is information indicating whether the call transfer setting information is acquired (ON) or not (OFF) via the connected network as described above. In the case of OFF, the incoming call transfer control unit 223 receives the incoming call transfer setting information stored in advance in the transfer state storage table, for example, the incoming call condition indicated by the incoming call transfer setting information set according to the operation input of the network user. Request transfer setting or cancel call transfer setting. In the example shown in FIG. 6, “ON” is set for the license band network. For a license-unnecessary band, the network confirmation setting is “−” that cannot be set. In other words, as the incoming call transfer setting information (transfer setting, transfer number, transfer time) related to the license-unnecessary band, setting information by a user input or a preset fixed value is used instead of being acquired via the network. .

  The transfer setting is information indicating whether to perform incoming call transfer (ON) or not (OFF). In the example shown in FIG. 6, “ON” is set for both the license band network and the license-unnecessary band network. If “OFF” is set for the network of the license-unnecessary band, and the terminal device 20 is connected to the license-unnecessary band, the incoming call transfer is not performed. By default, the transfer setting is “ON” regardless of the network.

The transfer number is an identification number for identifying a transfer destination device. In the example illustrated in FIG. 6, “043-xxxx-xxxx” is set as the transfer number for the license band network, and “050-yyyy-yyyy” is set for the license-unnecessary band network. The transfer number can be arbitrarily set based on a user operation input. The transfer destination device is not necessarily limited to the terminal device 20 and may be an arbitrary electronic device such as a separate terminal device or a home appliance.
The transfer time is a waiting time from incoming call to transfer. If there is an incoming call response within the transfer time, the MMTelAS (not shown) transmits the incoming data to the original destination device via the incoming network. If there is no incoming response within the transfer time, the MMTelAS (not shown) transmits the received data to the transfer destination device indicated by the transfer number. In the example shown in FIG. 6, “30 seconds” is set for the license band and “0 seconds” is set for the license unnecessary band as the transfer time. “0 seconds” means an unconditional incoming call response.

Next, the incoming call transfer setting process according to the present embodiment will be described.
FIG. 7 is a flowchart showing the incoming call transfer setting process according to the present embodiment.
(Step S401) The incoming call transfer control unit 223 refers to the transfer state storage table when it is possible to connect to the network of the license-unnecessary band, and checks whether the network check setting related to the license band network is ON. If it is ON (step S401 YES), the process proceeds to step S402. If it is OFF (NO in step S401), the process proceeds to step S404.

(Step S <b> 402) The incoming call transfer control unit 223 confirms by reading transfer setting information currently set for the terminal device 20 from the MMTelAS (not shown). Thereafter, the process proceeds to step S403.
(Step S403) The incoming call transfer control unit 223 stores the read transfer setting information in the storage unit 23 in association with the license band network. Thereafter, the process proceeds to step S404.

(Step S404) The incoming call transfer control unit 223 reads the incoming call transfer setting information related to the network of the license-unnecessary band with reference to the transfer state storage table, and instructs the incoming call transfer according to the incoming call transfer condition indicated by the read incoming call transfer setting information. Incoming call transfer setting request information to be generated is generated, and transfer setting is made to the MMTelAS (not shown) of the license band based on the information. Thereafter, the process shown in FIG. 7 ends.

Note that the processing shown in FIG. 7 may be performed within the processing of steps S102 (FIG. 3) and S304 (FIG. 5).
Further, the above-described incoming call transfer setting release request process may be performed within the process of step S203 (FIG. 4). In the incoming call transfer setting release request process, the incoming call transfer control unit 223 refers to the transfer state storage table, reads the incoming call transfer setting information related to the network of the license-unnecessary band, and the incoming call transfer condition indicated by the read incoming call transfer setting information. The call transfer setting cancellation request information for instructing the cancellation of the call transfer is generated. The incoming call transfer control unit 223 transmits the generated incoming call transfer setting cancellation request information to the MMTelAS (not shown). The MMTelAS cancels the incoming call transfer setting based on the incoming call transfer setting information indicated by the incoming call transfer setting release request information received from the terminal device 20, and receives the incoming call transfer setting release completion information indicating that the incoming call transfer setting has been released. Send to.

  The transfer setting information set in the MMTelAS (not shown) is updated by the above-described call transfer setting release process or call transfer setting release request process, but the terminal device 20 then reconnects to the license band network. There is. In that case, the incoming call transfer control unit 223 reads the incoming call transfer setting information relating to the license band network from the transfer state storage table stored in the storage unit 23. The incoming call transfer control unit 223 performs the incoming call transfer setting request process described above based on the read incoming call setting information. As a result, even when the license band is restored, the MMTelAS transfers the incoming data addressed to the terminal device 20 under the incoming call transfer conditions specified by the incoming call setting information stored in the storage unit 23. For this reason, incoming data is transferred under an incoming call transfer condition arbitrarily set by a user operation input, or an incoming call transfer condition used in a license band network in the past. For example, when an incoming call response cannot be made within a predetermined transfer time after an incoming call in the license band network, data received in the license band can be received by an arbitrary electronic device.

As described above, the terminal device 20 according to the present embodiment includes the storage unit 23 that stores transfer condition information indicating transfer conditions, and the incoming call transfer control unit 223 controls the control device based on the transfer condition information. Request transfer to (e.g., MMTelAS).
With this configuration, even when the transfer condition information set in the control device is changed by switching the network, the transfer condition information according to the original network is stored in the storage unit 23 according to the transfer condition information. Call forwarding can be realized. In addition, by using transfer condition information arbitrarily set in the storage unit 23, it is possible to realize incoming call transfer according to the transfer condition.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. About the same structure as embodiment mentioned above, the same code | symbol is attached | subjected and the description is used.
The communication system 1 according to the present embodiment relates to processing when the terminal device 20 cannot return from the license-unnecessary band network to the license band network.

  When the terminal device 20 is connected to a license-unnecessary band network, the switching control unit 221 determines whether switching (returning) to the license-band network is necessary. The switching control unit 221 determines that switching is necessary when, for example, a license-unnecessary band cannot be detected by cell search and switching to a license band is instructed according to user settings. If the license-unnecessary band cannot be detected by the cell search, for example, the terminal device 20 may be located outside the license-unnecessary band. In other cases, the switching control unit 221 determines that switching is unnecessary.

  When it is determined that the license band needs to be switched to the network, the switching control unit 221 determines whether the switching is possible. The switching control unit 221 determines that switching is possible, for example, when it is determined that switching is necessary because a license-unnecessary band cannot be detected by cell search, and when a license band is detected by cell search. When switching is instructed according to user settings, the switching control unit 221 performs a cell search while staying in a license-unnecessary band, and can switch to a license band when a license band is detected by the cell search. Is determined. In other cases, the switching control unit 221 determines that switching cannot be performed, and repeats the cell search.

Next, incoming call transfer setting cancellation processing according to the present embodiment will be described. The terminal device 20 is connected to a license-free band at the beginning of this process.
FIG. 8 is a flowchart of the incoming call transfer setting cancellation process according to the present embodiment.
(Step S501) The switching control unit 221 determines whether or not it is necessary to return the license band to the network. If it is determined that a return is necessary (step S501 YES), the process proceeds to step S502. If it is determined that no return is required (NO in step S501), step S501 is repeated.
(Step S502) The switching control unit 221 determines whether or not the license band can be returned to the network. If it is determined that recovery is possible (YES in step S502), the process proceeds to step S503. If it is determined that it cannot be restored (NO in step S502), step S502 is repeated. In the process of repeating step S502, the switching control unit 221 performs a cell search to detect an available band.

(Step S503) The switching control unit 221 requests the MMTelAS to cancel the incoming call transfer setting by transmitting incoming call transfer setting release request information to the MMTelAS (not shown). After the MMTelAS completes the cancellation of the incoming call transfer setting, the process proceeds to step S504.
(Step S504) The incoming call transfer control unit 223 sets the VoIP function of its own device from an enabled state to an disabled state (VoIP setting OFF). Proceed to step S505.
(Step S505) The switching control unit 221 returns to the network of the detected license band. After the process related to the return is completed, the process shown in FIG.

  Note that the processing in steps S503, S504, and S505 may be the same as the processing in steps S203, S204, and S202 (FIG. 4), respectively. Further, immediately after the process of step S505, the above-described incoming call transfer setting release request process may be performed.

As described above, according to the present embodiment, when switching from the license-unnecessary band network to the license band network, the switching control unit 221 continues to detect the network until the license band network is detected.
With this configuration, even when the license band network is temporarily not detected, the switching to the license band network is more reliably realized.

(Modification)
As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

For example, the terminal device 20 may include an operation input unit that receives an operation input by a user and outputs an input signal corresponding to the received operation input to the control unit 22. The operation input unit is, for example, a pointing device such as a touch sensor or a keyboard.
The terminal device 20 may include a display unit that displays information processed by the control unit 22. The display unit is, for example, a liquid crystal display, an organic EL display, or the like.
In the above-described embodiment, the case where various types of information are set according to the user's operation input has been described. However, the present invention is not limited to this. These pieces of information may be input from other devices connected to the terminal device 20, or may be generated by executing a control program on the terminal device 20.

In the above description, VoIP in which the data to be transferred is voice data is taken as an example, but the present invention is not limited to this. The transferred data may be data in an image, text, or other format as long as it can be transmitted / received by IP.
In addition, when a plurality of license-unnecessary band networks are detected, the switching control unit 221 may select any one of the detected networks. For example, the switching control unit 221 may select a network in which the above-described index indicating signal quality indicates the best signal quality, or a network in which the usage fee is most economical.

In addition, the terminal device 20 includes a USIM card or SIM card that stores in advance a specific carrier information representing a license-unnecessary band and an identification number of the own device, so that the license-unnecessary band of the carrier is always obtained. Can be used to communicate.
Moreover, a USIM card or a SIM card can be omitted by storing the business operator information in the storage unit of the terminal device 20 in advance.

The embodiment described above can also be implemented in the following manner.
(1) A switching control unit for switching from a license band network to a license-unnecessary band network according to the network detection status, and transfer of data addressed to the own device to a predetermined device using an access method-independent protocol. A terminal device comprising: an incoming call transfer control unit that requests a control device that controls outgoing / incoming calls with devices connected to a band network.

(2) The terminal device according to (1), further including a setting unit that enables reception of data according to the protocol, wherein the incoming call transfer control unit requests the control device to transfer to the own device.

(3) When the switching control unit switches from the license-unnecessary band network to the license band network according to a network detection status, the incoming call transfer control unit cancels the transfer to the control device. Requesting terminal device of (1) or (2).

(4) A storage unit for storing transfer condition information indicating the transfer condition is provided, and the incoming call transfer control unit requests the control device to transfer based on the transfer condition information (1) to (3 ) Any terminal device.

(5) When the switching control unit switches from the license-unnecessary band network to the license band network, the switching control unit continues to detect the network until the license band network is detected (1). To (4).

(6) A communication system comprising a terminal device, a control device, at least a license band network, and a license-unnecessary band network, wherein the control device is connected to a device connected to the license band network. The terminal device controls incoming calls, and the terminal device is independent of a switching control unit for switching from a license band network to a license-unnecessary band network according to the detection status of the network, and an access method independent of a predetermined device of data addressed to itself. A communication system comprising: an incoming call transfer control unit that requests transfer by a protocol to a control device that controls outgoing and incoming calls to and from a device accommodated in the license band network.

(7) A communication control method for a terminal device, which is a switching step of switching from a license band network to a license-unnecessary band network according to the detection status of the network, and an access method independent of data destined for the own device to a predetermined device And a call transfer step for requesting a control device that controls transmission / reception to / from a device connected to the license band network.

(8) A switching step of switching from a license band network to a license-unnecessary band network according to the detection status of the network in the terminal device computer, and transfer of data addressed to the own device to a predetermined device using a protocol independent of the access method The communication control program for executing the incoming call transfer step for requesting the control device that controls outgoing / incoming calls to / from a device connected to the license band network.

Note that a part of the terminal device 20, for example, the control unit 22 may be realized by a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed.
Moreover, you may implement | achieve part or all of the base station apparatus in the embodiment mentioned above, and the terminal device 20 as integrated circuits, such as LSI (Large Scale Integration). Each functional block of the base station apparatus and part of the terminal apparatus 20 may be individually made into a processor, or part or all of them may be integrated into a processor. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to the advancement of semiconductor technology, an integrated circuit based on the technology may be used.

DESCRIPTION OF SYMBOLS 1 ... Communication system, 20 (Tm) ... Terminal device, 21 ... Communication part,
211 (211-1 to 211-M): transmission unit, 212 (212-1 to 212-M): reception unit, 22 ... control unit, 221 ... switching control unit, 222 ... incoming call control unit, 223 ... incoming call transfer control Part,
224 ... Terminal VoIP setting unit, 23 ... Storage unit,
La, Ua ... Base station equipment

Claims (5)

When the license band provided through the first network is used, a cell search is performed to detect a license-free band that is a predetermined frequency band provided through the second network . A switching control unit for switching from a network to the second network;
Call transfer by access method independent protocol addressed to its own device, which is connected to the first network, and controls the sending and receiving voice data between the first network other devices connected to the connecting device An incoming call transfer control unit for requesting the control device,
A terminal device that receives voice data addressed to itself from the control device using the second network according to the protocol . When the switching control unit switches from the second network to the first network according to a network detection situation,
The incoming call transfer control unit requests the control device to cancel the incoming call transfer ;
The terminal device according to claim 1, wherein when the control device cancels the incoming call transfer, voice data addressed to the device itself is received from the control device using the first network . A setting unit configured to enable or disable reception of the audio data according to the protocol;
The setting unit
The terminal device according to claim 2 , wherein when the control device cancels the incoming call transfer, reception of the voice data by the protocol is set to be invalid . A storage unit for storing transfer condition information indicating a condition of the incoming call transfer;
The terminal device according to claim 1, wherein the incoming call transfer control unit requests the incoming call transfer to the control device based on the transfer condition information. The switching control unit, when said switch to the second from the network the first network, the terminal device according to any one of claims 1 to network license band continues the detection of the network to be detected 4 .

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