JP4902599B2 - Wireless terminal device and wireless communication switching control method - Google Patents

Description

  The present invention includes a cellular phone interface unit and a wireless LAN interface unit, and performs wireless switching between a cellular phone by circuit switching via a cellular phone network and a VoIP (Voice over IP) call via a wireless LAN network and an IP network. The present invention relates to a terminal device and a wireless communication switching control method for switching (handover) between a phone call and a VoIP call.

  VCC (Voice Call Continuity) is a technology for seamlessly connecting a cellular phone network and a wireless LAN network. This VCC is one of the technologies for realizing FMC (Fixed Mobile Convergence) that integrates fixed communication and mobile communication, and standardized specifications have been formulated in Release 7 of 3GPP (Third Generation Partnership Project).

  In VCC, circuit switching is used for a call via a mobile phone network, and VoIP is used for a call via a wireless LAN network. A SIP (Session Initiation Protocol) server is used for VoIP call control. By using this VCC, a telephone call can be made outdoors via a cellular phone network, and a telephone call (IP telephone) can be made via a wireless LAN network and an IP network within a wireless LAN access point area. Switching between these networks (handover) is not performed manually by the user, but is automatically performed using the call continuity control function (CCCF) defined as the IMS application server. Seamless handover is possible without interruption of communication or communication (Non-Patent Document 1).

Also, an application server that realizes VCC has been commercialized (Non-Patent Document 2), and a seamless voice call service that automatically selects an optimal network when a user moves between different networks is realized. As a result, even if a user with a dual-mode terminal moves between a mobile phone network and a wireless LAN network, the call can be handed over without interruption. For example, a service that does not require separate use of a mobile phone and an IP phone is provided. Has been.
Takeshi Hattori, et al., Wireless Broadband Textbook (High Speed IP Wireless), Impress R & D, pp.330-332, issued on June 21, 2006 http://www.nec.co.jp/netsoft/nc7000-vc/

  By the way, in the conventional handover by VCC, it is necessary to arrange an application server having a call continuation control function (CCCF) in a place where both the cellular phone network and the wireless LAN network can be accessed. The installation of such a server can be easily handled if the service providers of both networks are the same, but it is extremely difficult to handle when the service providers of both networks are different from each other. Examples of the latter include the following cases.

  Since wireless LAN access points can be installed freely without a license, IP phone services using VoIP are provided by temporarily establishing a wireless LAN network outside the mobile phone area such as exhibition halls and disasters. Sometimes. At this time, there is a need to seamlessly hand over to the mobile phone when the user moves to an area within the mobile phone. However, in order to realize this, it is necessary to install an application server having a CCCF together with the construction of the wireless LAN network. However, in the wireless LAN network that is temporarily constructed, there is no cost combination. The same applies to a mode in which an IP phone is used in a wireless LAN network in a small office and a mobile phone is used outside the office.

  On the other hand, if handover is realized by processing on the wireless terminal side without using CCCF, cost reduction is expected. This is because it is not necessary to modify the existing network. At this time, in the handover from the VoIP to the mobile phone, the communication quality (for example, reception level) of the wireless LAN is measured while implementing the VoIP, and switching to the mobile phone is triggered by the deterioration of the communication quality. In the handover from the mobile phone to the VoIP direction, connection with the wireless LAN is tried while talking on the mobile phone, and switching to VoIP is triggered by the establishment of the connection with the wireless LAN. In performing such control, in the case where a communication quality degradation is detected when a handover is performed from the former VoIP to the cellular phone, the VoIP caller does not directly become the caller of the cellular phone. Sometimes billing issues arise.

  According to the present invention, in a handover between a VoIP and a mobile phone, the handover is realized by the processing on the wireless terminal side without using the CCCF function, and the caller side at the start of the call is charged at the time of the handover. An object of the present invention is to provide a wireless terminal device and a wireless communication switching control method.

  A first invention includes a mobile phone interface unit and a wireless LAN interface unit, and serves as a call partner in a wireless terminal device that switches between a mobile phone call via a mobile phone network and a VoIP call via a wireless LAN network and an IP network. A table that stores the VoIP authentication ID and mobile phone number of the wireless terminal device in association with each other, and if the wireless LAN network and the IP network can be connected, the VoIP authentication ID of the own device is registered in the SIP server on the IP network. And whether or not the VoIP authentication ID of the receiving wireless terminal device obtained from the table is registered in the SIP server if the device can connect to the wireless LAN network when making a call to the wireless terminal device of the other party Inquire about the VoI If the authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network and a call is made, and the VoIP authentication ID of the calling or called wireless terminal device is not registered in the SIP server. Control means for making a call by a mobile phone via a mobile phone network, and switching from a VoIP call to a mobile phone call or from a mobile phone call to a VoIP call by controlling the calling side during each call Is provided.

  The control means A of the wireless terminal device according to the first aspect of the invention makes a call from a calling-side wireless terminal device to a called-side wireless terminal device by a mobile phone during a VoIP call. Holds the incoming call by the mobile phone, maintains the ringing state between the wireless terminal device on the calling side and the called side, further measures the communication quality of the wireless LAN, and exchanges both communication quality information via the IP network When the deterioration of the communication quality of at least one of the wireless LANs on the caller side and the callee side is detected, the callee-side wireless terminal device establishes a call in response to the ringing mobile phone and disconnects the VoIP call. In this configuration, the call is switched from the VoIP call to the mobile phone call.

  In addition, the control means A registers the VoIP authentication ID of the incoming wireless terminal device obtained from the table in the SIP server so that the outgoing wireless terminal device that can be connected to the wireless LAN network is registered from the table during the call using the mobile phone. If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network, the VoIP call is established and the mobile phone call is disconnected. In this configuration, the cellular phone is switched to a VoIP call.

  The control means B of the wireless terminal device in the first invention measures the communication quality of the wireless LAN and exchanges both pieces of communication quality information via the IP network during a VoIP call. When a deterioration in communication quality of one wireless LAN is detected, a call is made from the caller-side radio terminal device to the callee-side radio terminal device via a mobile phone, and the callee-side radio terminal device receives an incoming call via the mobile phone. In response, the call is established and the VoIP call is disconnected to switch from the VoIP call to the mobile phone call.

  Further, the control means B rejects or holds the incoming call if the incoming call is received by the mobile phone at the originating wireless terminal device during the VoIP call, and if the incoming call is received by the mobile phone at the incoming wireless terminal device, the table If the incoming mobile phone number is from the originating wireless terminal device, it responds, and if it is not from the originating wireless terminal device, the incoming call is rejected or put on hold.

  In addition, the control means B registers, in the SIP server, the VoIP authentication ID of the incoming wireless terminal device obtained from the table of the outgoing wireless terminal device that can be connected to the wireless LAN network during a mobile phone call. If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network, the VoIP call is established and the mobile phone call is disconnected. In this configuration, the cellular phone is switched to a VoIP call.

  Further, the control means A and B are configured to detect deterioration of the communication quality of the wireless LAN, switch from VoIP call to mobile phone call, and delete registration of the VoIP authentication ID of the wireless terminal device from the SIP server. is there.

  A second aspect of the invention is a wireless terminal device including a mobile phone interface unit and a wireless LAN interface unit, and wireless communication switching control for switching between a mobile phone call via a mobile phone network and a VoIP call via a wireless LAN network and an IP network. In the method, the wireless terminal device stores the VoIP authentication ID and the mobile phone number of the wireless terminal device to be a call partner in association with each other in a table, and if the wireless terminal device can be connected to the wireless LAN network and the IP network, When registering the VoIP authentication ID of the own device in the SIP server and making a call to the other party's wireless terminal device, if the own device can be connected to the wireless LAN network under the control of the control means, the incoming side wireless obtained from the table The VoIP authentication ID of the terminal device is SIP If the VoIP authentication ID is registered, the VoIP call and call are made to the wireless terminal device via the wireless LAN network, and the calling or called wireless terminal If the VoIP authentication ID of the device is not registered in the SIP server, a call is made by a mobile phone via the mobile phone network and a call is made from a VoIP call to a call by a mobile phone under the control of the caller during each call, or Switch from a mobile phone call to a VoIP call.

  The control means A of the wireless communication switching method according to the second aspect of the invention makes a call from a calling-side wireless terminal device to a called-side wireless terminal device by a mobile phone during a VoIP call, and the called-side wireless terminal device Holds the incoming call by the mobile phone, performs control to maintain the ringing state between the wireless terminal device on the calling side and the called side, and further measures the communication quality of the wireless LAN and transmits both communication quality information to the IP network. When the communication quality of at least one of the originating and terminating wireless LANs is detected, the terminating wireless terminal establishes a call in response to the ringing mobile phone and uses VoIP Control is performed to disconnect the call and switch from a VoIP call to a mobile phone call.

  In addition, the control means A registers the VoIP authentication ID of the incoming wireless terminal device obtained from the table in the SIP server so that the outgoing wireless terminal device that can be connected to the wireless LAN network is registered from the table during the call using the mobile phone. If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network, the VoIP call is established and the mobile phone call is disconnected. Control is performed to switch from a mobile phone to a VoIP call.

  The control means B of the wireless communication switching method according to the second invention measures the communication quality of the wireless LAN and exchanges both pieces of communication quality information via the IP network during a VoIP call. When a deterioration in communication quality of at least one of the wireless LANs is detected, a call is made from the caller-side radio terminal device to the callee-side radio terminal device via a mobile phone, and the callee-side radio terminal device is A call is established in response to the incoming call, and the VoIP call is disconnected, and control is performed to switch from the VoIP call to the mobile phone call.

  Further, the control means B rejects or holds the incoming call if the incoming wireless terminal device receives an incoming call from the mobile phone during a VoIP call, and sets the table if the incoming wireless terminal device receives an incoming call from the mobile phone. If the incoming mobile phone number is from the originating wireless terminal device, the response is made. If not, the incoming call is rejected or held.

  In addition, the control means B registers, in the SIP server, the VoIP authentication ID of the incoming wireless terminal device obtained from the table of the outgoing wireless terminal device that can be connected to the wireless LAN network during a mobile phone call. If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network, the VoIP call is established and the mobile phone call is disconnected. Control is performed to switch from a mobile phone to a VoIP call.

  Further, the control means A and B detect the deterioration of the communication quality of the wireless LAN, and switch from the VoIP call to the mobile phone call and control to delete the registration of the VoIP authentication ID of the wireless terminal device from the SIP server. Do.

  The control means in the wireless terminal device and the wireless communication switching control method of the present invention determines whether or not both the originating and terminating wireless terminal devices can be connected to the wireless LAN network and the IP network, and both can be connected. For example, a VoIP call is made, and if at least one of them cannot connect to the wireless LAN network and the IP network, a call using a mobile phone is made. Furthermore, switching from a VoIP call to a mobile phone call or from a mobile phone call to a VoIP call by controlling the calling side enables handover without using the CCCF function on the network, thereby reducing system costs. However, it is possible to charge the caller side with certainty.

  Further, the control means A makes a mobile phone call from the calling-side wireless terminal device to the called-side wireless terminal device during a VoIP call, and maintains the ringing state, so that the mobile phone from the other wireless terminal device can carry it. Call switching from VoIP to mobile phone (handover) by eliminating incoming calls by telephone and responding to incoming calls in ringing state at the receiving wireless terminal when the communication quality of at least one wireless LAN deteriorates I do. Further, the control unit A switches the call from the mobile phone to the VoIP (handover) if the caller and callee wireless terminal devices can be connected to the IP network during the call by the mobile phone. )I do. As a result, it is possible to select the optimum communication path based on the communication status of both parties while maintaining the relationship between the calling side and the called side at the start of the call, and to maintain the communication quality by the handover. In particular, in the handover from the VoIP to the mobile phone, by maintaining the ringing state between the caller side and the callee side, seamless handover can be performed by eliminating interruptions from other wireless terminal devices.

  In addition, the control means B sends a call from the calling-side wireless terminal device to the called-side wireless terminal device by a mobile phone when the communication quality of at least one wireless LAN deteriorates during a VoIP call, When the wireless terminal device responds, call switching (handover) from the VoIP to the mobile phone is performed. At this time, if the incoming call of the mobile phone is not from a partner who is in a VoIP call, the incoming call is rejected or put on hold. Further, the control unit B switches the call from the mobile phone to the VoIP (handover) if the caller and callee wireless terminal devices can be connected to the IP network during a call by the mobile phone. )I do. As a result, it is possible to select the optimum communication path based on the communication status of both parties while maintaining the relationship between the calling side and the called side at the start of the call, and to maintain the communication quality by the handover. In particular, in the handover from VoIP to mobile phone, it is possible to eliminate interruptions from other wireless terminal devices by giving priority to outgoing / incoming calls between the caller and callee over those from third parties. Handover is possible.

(First embodiment)
FIG. 1 shows a system configuration example according to the first embodiment of the present invention.
The system configuration in the present embodiment is such that the wireless LAN networks 12 and 13 are connected to each other via the IP network 11, and the wireless terminal 20A in the wireless LAN area 15 formed by the access point (AP) 14 of the wireless LAN network 12 is configured. VoIP communication is possible with the wireless terminal 20B in the wireless LAN area 17 formed by the access point (AP) 16 of the wireless LAN network 13, and via the mobile phone base station and the mobile phone network 19 Calls can be made by circuit switching. That is, the wireless terminals 20A and 20B have a function of connecting to the wireless LAN networks 12 and 13 and the IP network 11 and the cellular phone network 19, respectively, and if both are in the wireless LAN area, perform a VoIP call, at least one of them If the mobile phone is outside the wireless LAN area, a call can be made by a mobile phone, and hand-over can be performed with the functions described later. In the IP network 11, a SIP server 10 that controls session establishment with a call partner before the start of a VoIP call is arranged. Here, it is assumed that the wireless terminal 20A is the calling side, the wireless terminal 20B is the receiving side, and charging is performed on the calling wireless terminal 20A.

FIG. 2 shows a configuration example of the wireless terminal device of the present invention.
The wireless terminal device 20 includes a wireless LAN interface unit 21 having a connection function with the wireless LAN networks 12 and 13 through access points (AP) 14 and 16, and a mobile phone network 19 through the mobile phone base station 18. A mobile phone interface unit 22 having a connection function, a wireless LAN control unit 23 connected to the wireless LAN interface unit 21, a mobile phone control unit 24 connected to the mobile phone interface unit 22, a wireless LAN control unit 23, and a mobile phone An interface switching control unit 25 connected to the telephone control unit 24, a mobile phone number of a communication partner and a VoIP authentication ID are stored in association with each other, a table 26 connected to the interface switching control unit 25, and a microphone / speaker Through the interface switching control unit 25. It composed of a voice input and output unit 27 connected to the wireless LAN controller 23 or the mobile phone controller 24.

  The wireless LAN control unit 23 measures a signal processing function for performing a VoIP call and communication quality (for example, reception level) of the wireless LAN (between the local station and the AP), and the VoIP authentication of the local station according to the communication quality A function of performing processing for registering or deleting the ID in the SIP server 10 of the IP network 11, confirming whether or not the VoIP authentication ID of the other party is registered in the SIP server 10 and notifying the interface switching control unit 25. Prepare. The mobile phone control unit 24 has a mobile phone outgoing / incoming and hold control function and a signal processing function for making a call.

  The interface switching control unit 25 performs selection control between a VoIP call via the wireless LAN networks 12 and 13 and the IP network 11 and a call exchange via the mobile phone network 19 based on the notification information of the wireless LAN control unit 23. In addition, the mobile phone number and the VoIP authentication ID are associated with each other with reference to the table 26, and a function of performing handover control from the VoIP to the mobile phone and from the mobile phone to the VoIP is provided. Note that the functions characteristic of the present invention are realized mainly by the interface switching control unit 25 and will be described in detail below.

(Processing example 1 of the first embodiment: VoIP → mobile phone)
FIG. 3 shows a processing example 1 of the first embodiment of the present invention. Here, a call start procedure by VoIP and a handover process procedure from VoIP to a mobile phone will be described with reference to FIGS.

  When the wireless terminals 20A and 20B detect the wireless LAN under the control of the interface switching control unit 25 and the wireless LAN control unit 23 and can be connected to the IP network 11, the VoIP authentication ID of the local station is given to the SIP server 10. Is registered (S1). Next, the interface switching control unit 25 and the wireless LAN control unit 23 of the wireless terminal 20A that issued the outgoing call request confirm the registration status of the VoIP authentication ID of the incoming wireless terminal 20B with the SIP server 10 (S2). When the registration of the VoIP authentication ID of the terminal 20B is confirmed, a call is made by VoIP, and a call by VoIP is performed according to a response from the wireless terminal 20B (S3).

  Next, the interface switching control unit 25 of the transmitting-side radio terminal 20A acquires a mobile phone number corresponding to the VoIP authentication ID of the receiving-side radio terminal 20B with reference to the table 26, and controls the mobile phone control unit 24. Then, the mobile phone makes a call (S4). Here, when the originating wireless terminal 20A or the terminating wireless terminal 20B is not connectable to the cellular phone network 19 (outside the area of the cellular phone base station 18 or the other party is busy), the originating wireless terminal 20A Periodically repeats outgoing calls via mobile phone.

  In addition, the receiving-side radio terminal 20B does not respond to the incoming call of the mobile phone that occurs during the VoIP call and puts it on hold (S5). That is, during a VoIP call, the ringing state continues between the originating wireless terminal 20A and the terminating wireless terminal 20B. When the ringing state is cut off halfway due to the function of the mobile phone network 19, the caller-side radio terminal 20A repeats the call from the mobile phone. On the other hand, since the hold / ringing state for outgoing calls from the other radio terminal 20C is arbitrarily performed by the user, it often ends in a short time. Even if the calling-side radio terminal 20A is busy for that purpose, the calling by the mobile phone is periodically repeated, and once it is put on hold / ringing, it is maintained during the VoIP call. As a result, the wireless terminals 20A and 20B in the VoIP call prepare for a handover from the VoIP to the mobile phone, which will be described later, while forming a busy state for the incoming call of the mobile phone from the other wireless terminal 20C (S6). be able to.

  Next, the wireless LAN control unit 23 of the wireless terminals 20A and 20B during the VoIP call measures the communication quality (for example, reception level) of the wireless LAN (between the local station and the AP), and the measured communication quality information is transmitted to the IP network. 11 (S7), and notifies the interface switching control unit 25. When the interface switching control unit 25 and the mobile phone control unit 24 of the receiving-side wireless terminal 20B detect a deterioration in the communication quality of the wireless LAN on either the calling side or the receiving side, the interface switching control unit 25 and the mobile phone control unit 24 are put on hold (ringing state). The mobile phone responds to the incoming call of the mobile phone (receives the call) and establishes a mobile phone call with the mobile phone control unit 24 of the radio terminal 20A (S8). Next, the interface switching control unit 25 of the wireless terminals 20A and 20B controls the wireless LAN control unit 23 by establishing the mobile phone and disconnects the VoIP call (S9). Thereby, the handover from the VoIP to the mobile phone is completed.

  Further, the wireless LAN control unit 23 of the wireless terminal (in this case, 20B) whose communication quality has deteriorated deletes its own VoIP authentication ID from the SIP server 10 of the IP network 11 (S10). Note that the SIP server 10 has a function of autonomously canceling registration when communication with the wireless terminals 20A and 20B is not possible. If the wireless terminal has already moved out of the wireless LAN area, the SIP server Even if communication with the terminal 10 is not possible, the registration is deleted.

(Processing example 2 of the first embodiment: mobile phone → VoIP)
FIG. 4 shows a processing example 2 of the first embodiment of the present invention. Here, a call start procedure by a mobile phone and a handover processing procedure from the mobile phone to VoIP will be described with reference to FIGS.

  When the wireless terminals 20A and 20B detect the wireless LAN under the control of the interface switching control unit 25 and the wireless LAN control unit 23 and can connect to the IP network 11, the VoIP authentication ID of the local station is sent to the SIP server 10. Is registered (S1). Here, only the transmitting-side radio terminal 20 </ b> A registers its own VoIP authentication ID in the SIP server 10. Next, the interface switching control unit 25 and the wireless LAN control unit 23 of the wireless terminal 20A that issued the outgoing call request confirm the registration status of the VoIP authentication ID of the incoming wireless terminal 20B with the SIP server 10 (S2). When it is confirmed that the VoIP authentication ID of the terminal 20B has not been registered, the mobile phone control unit 24 is controlled to make a call using the mobile phone, and a call is made using the mobile phone in response to the wireless terminal 20B (S11).

  If the originating wireless terminal 20A cannot detect the wireless LAN and has not performed the process of step S1, the process of step S2 cannot be performed. Make a phone call.

  The wireless terminals 20A and 20B in the mobile phone attempt to detect the wireless LAN under the control of the interface switching control unit 25 and the wireless LAN control unit 23, respectively, and when the connection to the IP network 11 is possible, The VoIP authentication ID of the station is registered (S12). Here, since the VoIP authentication ID of the originating wireless terminal 20A is already registered in the SIP server 10, the VoIP authentication ID of the wireless terminal 20B is registered in the SIP server 10, and the interface switching control of the originating wireless terminal 20A is performed. When the unit 25 and the wireless LAN control unit 23 confirm the registration of the VoIP authentication ID of the receiving-side wireless terminal 20B (S13), the VoIP call is started (S14). Next, after confirming the establishment of the VoIP call, the interface switching control unit 25 of the wireless terminals 20A and 20B controls the mobile phone control unit 24 and disconnects the call using the mobile phone (S15). Thereby, the handover from the mobile phone to the VoIP is completed.

  During a call based on VoIP, the process proceeds to step S4 in FIG. 3 to resume the call by the mobile phone, form a busy state for the incoming call from the other wireless terminal 20C, and carry from the VoIP due to the deterioration of the wireless LAN quality. Prepare for handover to the phone.

(Example of processing procedure of transmitting side wireless terminal of first embodiment)
FIG. 5 shows an example of the processing procedure of the originating wireless terminal according to the first embodiment of the present invention.
Here, the processing procedure in the transmitting-side radio terminal 20A is shown, but the processing procedure in the receiving-side radio terminal 20B is almost compatible. Each step number corresponds to each of FIG. 3 and FIG.

  Note that the wireless terminals 20A and 20B during a VoIP call continue to make and hold (ringing) with the mobile phone at the same time, and if the VoIP call ends before the handover from the VoIP to the mobile phone is performed, Terminates outgoing calls and ends a series of processing. In addition, the wireless terminals 20A and 20B during a call using a mobile phone always monitor the state of the wireless LAN. However, if the mobile phone is terminated before the handover from the mobile phone to the VoIP is performed, a series of processing is performed as it is. Exit.

(Second Embodiment)
In the first embodiment, a busy state is formed for an incoming call from the other wireless terminal 20C to the wireless terminals 20A and 20B during the VoIP call, and the mobile phone from VoIP between the wireless terminals 20A and 20B during the VoIP call. At the time of handover to, the interruption of the other radio terminal 20C is eliminated so that the handover can be performed seamlessly.

  A feature of the present embodiment is that a busy state is not formed between the wireless terminals 20A and 20B during a VoIP call, and when the mobile phone receives an incoming call, the mobile phone number is from the other party during the VoIP call. If it is from the other party during the VoIP call, the call is answered, and if not, the incoming call is rejected or put on hold. As a result, when the wireless LAN communication quality deteriorates between the wireless terminals 20A and 20B during the VoIP call and a handover to the mobile phone becomes necessary, the calling wireless terminal 20A and the receiving wireless terminal 20B Can be handed over seamlessly by eliminating the interruption of the other wireless terminal 20C.

  As shown in FIG. 6, the system configuration in the present embodiment is substantially the same as the system configuration example (FIG. 1) to which the first embodiment is applied. Further, the wireless terminal device according to the present embodiment can be handled by the configuration shown in FIG.

(Processing Example 1 of Second Embodiment 1: VoIP → Cellular Phone)
FIG. 7 shows a processing example 1 of the second embodiment of the present invention. Here, a call start procedure by VoIP and a handover process procedure from VoIP to a mobile phone will be described with reference to FIGS.

  Similar to the first embodiment, the interface switching control unit 25 and the mobile phone control unit 24 of the wireless terminals 20A and 20B during the VoIP call are processed for the incoming call of the mobile phone through the processing of steps S1, S2, and S3. 26, the mobile phone number is checked against the VoIP authentication ID during the call, and if the mobile phone is from the wireless terminal of the other party of the VoIP call, the mobile phone is responded, and if the mobile phone is from the other wireless terminal 20C, the incoming call is rejected. Alternatively, it is put on hold (S21). The incoming call rejection uses, for example, a nuisance call stop service, transmits the incoming call rejection signal from the interface switching control unit 25 and the mobile phone control unit 24, and receives an incoming call from the service function in the mobile phone network 19 to another wireless terminal 20C. A notification of rejection may be sent. Also, an answering machine transfer process may be performed instead of the incoming call rejection. In addition, it is assumed that the hold / ringing state for outgoing calls from the other radio terminal 20C is completed in a short time because it is arbitrarily performed by the user.

  Next, the wireless LAN control unit 23 of the wireless terminals 20A and 20B during the VoIP call measures the communication quality (for example, reception level) of the wireless LAN (between the local station and the AP), and the measured communication quality information is transmitted to the IP network. 11 (S22), and notifies the interface switching control unit 25. When the interface switching control unit 25 and the mobile phone control unit 24 of the transmitting-side radio terminal 20A detect the deterioration of the communication quality of the wireless LAN on either the calling side or the receiving side, the mobile phone controls the radio terminal 20B. Is transmitted (S23), the wireless terminal 20B confirms that it is an incoming call from the wireless terminal 20A of the VoIP call partner and responds (S24), and the mobile phone between the mobile phone control units 24 of the wireless terminals 20A and 20B Is established (S25). When a call is made from the wireless terminal 20A on the calling side by a mobile phone, if there is an incoming call from another wireless terminal 20C, the call is busy. However, as shown in step S21, the incoming call is shortened by rejecting or holding the incoming call. Since the busy state is eliminated in time, it is possible to cope with the busy state by repeating the outgoing call by the mobile phone from the transmitting side radio terminal 20A. Next, the interface switching control unit 25 of the wireless terminals 20A and 20B controls the wireless LAN control unit 23 by establishing the mobile phone and disconnects the VoIP call (S26). Thereby, the handover from the VoIP to the mobile phone is completed.

  Further, the wireless LAN control unit 23 of the wireless terminal (20B in this case) whose communication quality has deteriorated deletes its own VoIP authentication ID from the SIP server 10 of the IP network 11 (S27). Note that the SIP server 10 has a function of autonomously canceling registration when communication with the wireless terminals 20A and 20B is not possible. If the wireless terminal has already moved out of the wireless LAN area, the SIP server Even if communication with the terminal 10 is not possible, the registration is deleted.

(Processing Example 2 of Second Embodiment: Cellular Phone → VoIP)
FIG. 8 shows a processing example 2 of the second embodiment of the present invention. Here, a call start procedure by a mobile phone and a handover processing procedure from the mobile phone to VoIP are shown.

  The call start procedure by the mobile phone and the handover processing procedure from the mobile phone to the VoIP in this embodiment are the same as those in the first embodiment shown in FIG. However, the processing after the handover from the mobile phone to the VoIP is different, and this embodiment does not form the ringing state of the mobile phone at the wireless terminals 20A and 20B during the VoIP call, and the VoIP partner does not respond to the incoming call of the mobile phone. If not, the processing for rejecting the incoming call or holding is different (S21).

(Example of processing procedure of transmitting side wireless terminal of second embodiment)
FIG. 9 shows an example of the processing procedure of the originating wireless terminal according to the second embodiment of the present invention.
Here, the processing procedure in the transmitting-side radio terminal 20A is shown, but the processing procedure in the receiving-side radio terminal 20B is almost compatible. Each step number corresponds to each of FIG. 7 and FIG.

  Note that the wireless terminals 20A and 20B during a VoIP call end the series of processes as long as the VoIP call ends before the handover from the VoIP to the mobile phone is performed. In addition, the wireless terminals 20A and 20B during a call using the mobile phone constantly monitor the state of the wireless LAN, and if the mobile phone is terminated before the handover from the mobile phone to the VoIP is performed, a series of processing is performed as it is. finish.

1 is a diagram showing a system configuration example according to a first embodiment of the present invention. The figure which shows the structural example of the radio | wireless terminal apparatus of this invention. The figure which shows the process example 1 (VoIP-> cell-phone) of the 1st Embodiment of this invention. The figure which shows the process example 2 (mobile telephone-> VoIP) of the 1st Embodiment of this invention. The flowchart which shows the example of the process sequence of the transmission side radio | wireless terminal of the 1st Embodiment of this invention. The figure which shows the system configuration example in the 2nd Embodiment of this invention. The figure which shows the process example 1 (VoIP-> cell-phone) of the 2nd Embodiment of this invention. The figure which shows the process example 2 (cellular phone-> VoIP) of the 2nd Embodiment of this invention. The flowchart which shows the example of the process sequence of the transmission side radio | wireless terminal of the 2nd Embodiment of this invention.

Explanation of symbols

10 SIP server 11 IP network 12, 13 Wireless LAN network 14, 16 Access point (AP)
15, 17 Wireless LAN area 18 Mobile phone base station 19 Mobile phone network 20A Wireless terminal (sender side)
20B wireless terminal (incoming side)
20C Other wireless terminals 21 Wireless LAN interface unit 22 Mobile phone interface unit 23 Wireless LAN control unit 24 Mobile phone control unit 25 Interface switching control unit 26 Table 27 Voice input / output unit

Claims (12)

In a wireless terminal device that includes a mobile phone interface unit and a wireless LAN interface unit, and switches between a mobile phone call via a mobile phone network and a VoIP call via a wireless LAN network and an IP network.
A table that stores the VoIP authentication ID and mobile phone number of the wireless terminal device that is the call partner in association with each other;
If it is connectable to the wireless LAN network and the IP network, means for registering the VoIP authentication ID of its own device in a SIP server on the IP network;
Whether or not the VoIP authentication ID of the incoming wireless terminal device obtained from the table is registered in the SIP server when the local device can connect to the wireless LAN network when making a call to the wireless terminal device of the other party If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network, and the VoIP authentication ID of the transmitting or receiving wireless terminal device is If not registered in the SIP server, the mobile phone makes a call and makes a call via the mobile phone network, and the caller controls the call from the VoIP call to the call by the mobile phone or the mobile phone during each call. Control means for switching from a telephone call to the VoIP call;
With
The control means makes a call by the mobile phone from the calling wireless terminal device to the receiving wireless terminal device during the VoIP call, and the receiving wireless terminal device holds the incoming call by the mobile phone. The ringing state is maintained between the originating and terminating wireless terminal devices, and the communication quality of the wireless LAN is measured and both communication quality information is exchanged via the IP network. When the deterioration of the communication quality of at least one of the wireless LANs on the side is detected, the wireless terminal device on the receiving side establishes a call in response to the mobile phone in the ringing state and disconnects the call based on the VoIP, The wireless terminal device is configured to switch from a phone call to a phone call using the mobile phone. The wireless terminal device according to claim 1 ,
The control means registers a VoIP authentication ID of a receiving-side wireless terminal device obtained from the table by a sender-side wireless terminal device connectable to the wireless LAN network in the SIP server during a call using the mobile phone. If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network to establish a VoIP call and to call the mobile phone. The wireless terminal device is configured to switch the call from the mobile phone to the VoIP call. In a wireless terminal device that includes a mobile phone interface unit and a wireless LAN interface unit, and switches between a mobile phone call via a mobile phone network and a VoIP call via a wireless LAN network and an IP network.
A table that stores the VoIP authentication ID and mobile phone number of the wireless terminal device that is the call partner in association with each other;
If it is connectable to the wireless LAN network and the IP network, means for registering the VoIP authentication ID of its own device in a SIP server on the IP network;
Whether or not the VoIP authentication ID of the incoming wireless terminal device obtained from the table is registered in the SIP server when the local device can connect to the wireless LAN network when making a call to the wireless terminal device of the other party If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network, and the VoIP authentication ID of the transmitting or receiving wireless terminal device is If not registered in the SIP server, the mobile phone makes a call and makes a call via the mobile phone network, and the caller controls the call from the VoIP call to the call by the mobile phone or the mobile phone during each call. Control means for switching from a telephone call to the VoIP call;
With
The control means measures the communication quality of the wireless LAN during the VoIP call, exchanges both pieces of communication quality information via the IP network, and communicates at least one of the wireless LAN on the calling side and the called side. when the deterioration of the quality wireless terminal device of the calling side is detected, performs a call by the cellular phone to the radio terminal device of the called from the wireless terminal device of the calling side, wireless terminal apparatus at the receive side the mobile A wireless terminal device that is configured to establish a call in response to an incoming call and to disconnect the VoIP call and switch from the VoIP call to the mobile phone call. The wireless terminal device according to claim 3 ,
The control means rejects or puts an incoming call if the incoming wireless terminal device receives an incoming call by a mobile phone during the VoIP call, and if the incoming wireless terminal device receives an incoming call by a mobile phone, If the mobile phone number received with reference to the table is from the originating wireless terminal device, it responds, and if it is not from the originating wireless terminal device, the incoming call is rejected or suspended. There is a wireless terminal device. The wireless terminal device according to claim 3 ,
The control means registers a VoIP authentication ID of a receiving-side wireless terminal device obtained from the table by a sender-side wireless terminal device connectable to the wireless LAN network in the SIP server during a call using the mobile phone. If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network to establish a VoIP call and to call the mobile phone. The wireless terminal device is configured to switch the call from the mobile phone to the VoIP call. In the radio | wireless terminal apparatus of Claim 1 or Claim 3 ,
The control unit detects deterioration of communication quality of the wireless LAN, switches from the VoIP call to the mobile phone call, and deletes the registration of the VoIP authentication ID of the wireless terminal device from the SIP server. There is a wireless terminal device. In a wireless communication switching control method for switching between a mobile phone call via a mobile phone network and a VoIP call via a wireless LAN network and an IP network in a wireless terminal device including a mobile phone interface unit and a wireless LAN interface unit,
The wireless terminal device stores a VoIP authentication ID and a mobile phone number of the wireless terminal device to be a call partner in association with each other in a table,
If it is connectable to the wireless LAN network and the IP network, the VoIP authentication ID of the own device is registered in a SIP server on the IP network,
When making a call to the wireless terminal device of the other party, if the own device can be connected to the wireless LAN network under the control of the control means, the VoIP authentication ID of the receiving wireless terminal device obtained from the table is sent to the SIP server. Inquires whether or not the VoIP authentication ID is registered, and if the VoIP authentication ID is registered, the VoIP call and call are made to the wireless terminal device via the wireless LAN network, and the wireless terminal device on the caller side or the callee side If the VoIP authentication ID is not registered in the SIP server, a call is made by the mobile phone via the mobile phone network and a call is made from the VoIP call by the control of the caller during each call. Or from the mobile phone call to the VoIP call Instead,
The control means is configured to make a call during the VoIP call.
A call is made from the calling-side wireless terminal device to the receiving-side wireless terminal device by the mobile phone, and the receiving-side wireless terminal device holds the incoming call by the mobile phone, and between the calling-side and receiving-side wireless terminal devices. To control the ringing state,
Further, when the communication quality of the wireless LAN is measured and both pieces of communication quality information are exchanged via the IP network and the deterioration of the communication quality of the wireless LAN of at least one of the calling side and the receiving side is detected, the incoming call The wireless terminal device on the side establishes a call in response to the ringing-state mobile phone, disconnects the VoIP call, and controls to switch from the VoIP call to the mobile phone call. Communication switching control method. In the wireless communication switching control method according to claim 7 ,
The control means registers a VoIP authentication ID of a receiving-side wireless terminal device obtained from the table by a sender-side wireless terminal device connectable to the wireless LAN network in the SIP server during a call using the mobile phone. If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network to establish a VoIP call and to call the mobile phone. The wireless communication switching control method is characterized in that control for switching from the mobile phone to the VoIP call is performed. In a wireless communication switching control method for switching between a mobile phone call via a mobile phone network and a VoIP call via a wireless LAN network and an IP network in a wireless terminal device including a mobile phone interface unit and a wireless LAN interface unit,
The wireless terminal device stores a VoIP authentication ID and a mobile phone number of the wireless terminal device to be a call partner in association with each other in a table,
If it is connectable to the wireless LAN network and the IP network, the VoIP authentication ID of the own device is registered in a SIP server on the IP network,
When making a call to the wireless terminal device of the other party, if the own device can be connected to the wireless LAN network under the control of the control means, the VoIP authentication ID of the receiving wireless terminal device obtained from the table is sent to the SIP server. Inquires whether or not the VoIP authentication ID is registered, and if the VoIP authentication ID is registered, the VoIP call and call are made to the wireless terminal device via the wireless LAN network, and the wireless terminal device on the caller side or the callee side If the VoIP authentication ID is not registered in the SIP server, a call is made by the mobile phone via the mobile phone network and a call is made from the VoIP call by the control of the caller during each call. Or from the mobile phone call to the VoIP call Instead,
The control means measures the communication quality of the wireless LAN during the VoIP call, exchanges both pieces of communication quality information via the IP network, and communicates at least one of the wireless LAN on the calling side and the called side. when the deterioration of the quality wireless terminal device of the calling side is detected, performs a call by the cellular phone to the radio terminal device of the called from the wireless terminal device of the calling side, wireless terminal apparatus at the receive side the mobile A wireless communication switching control method, comprising: establishing a call in response to an incoming call by a telephone, disconnecting the VoIP call, and switching from the VoIP call to the mobile phone call. In the wireless communication switching control method according to claim 9 ,
The control means rejects or puts an incoming call if the incoming wireless terminal device receives an incoming call by a mobile phone during the VoIP call, and if the incoming wireless terminal device receives an incoming call by a mobile phone, If the mobile phone number received with reference to the table is from the originating wireless terminal device, it responds, and if it is not from the originating wireless terminal device, the incoming call is rejected or suspended. A wireless communication switching control method characterized in that: In the wireless communication switching control method according to claim 9 ,
The control means registers a VoIP authentication ID of a receiving-side wireless terminal device obtained from the table by a sender-side wireless terminal device connectable to the wireless LAN network in the SIP server during a call using the mobile phone. If the VoIP authentication ID is registered, the VoIP call is made to the wireless terminal device via the wireless LAN network to establish a VoIP call and to call the mobile phone. The wireless communication switching control method is characterized in that control for switching from the mobile phone to the VoIP call is performed. In the wireless communication switching control method according to claim 7 or 9 ,
The control means detects deterioration of the communication quality of the wireless LAN, switches from the VoIP call to the mobile phone call, and deletes the registration of the VoIP authentication ID of the wireless terminal device from the SIP server. A wireless communication switching control method characterized in that:

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