JP4190982B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a technology for connecting two different wireless communication systems, and particularly to a technology for connecting two different wireless communication systems suitable for a cellular communication system and a wireless LAN communication system.

  Currently, various types of wireless communication systems are used. The cellular mobile communication service not only has a wide service area, but also enables high-speed communication. For example, in a W-CDMA (Wideband Code Division Multiple Access) cellular mobile communication system, a maximum data transmission rate of 384 kbps is realized, and high-speed movement can be supported.

  On the other hand, public wireless LAN (Local Area Network) services that realize high-speed data communication are widespread. The public wireless LAN service service area is spot-like in public areas such as hotels and stations, and is called a hot spot.

  In communication terminals compatible with such a plurality of different communication methods, a connection method and a switching method (handover) of a wireless communication system are being studied.

  Although the development of high-speed data communication technology is remarkable, the main purpose of use of the cellular mobile communication system is still a voice call.

  In fixed telephone services, low-priced services using VoIP (Voice Over IP) technology have become widespread, and mobile phone systems are becoming more expensive. Even in the mobile communication environment, low-priced mobile phones can be realized by VoIP phones using wireless LAN lines, and are attracting attention. However, the wireless VoIP system has a definite weakness that the user's mobility management is not sufficient and the service area is limited in contrast to the cellular mobile communication system originally developed mainly for telephone service.

  In the following, the call control method of the VoIP system is described. As VoIP call control, there are H.323 system, SIP (Session Initiation Protocol) system, etc., here, the SIP system will be described. SIP is a protocol that handles the start, change, and end of multimedia sessions, and is defined in RFC 3261 of the Internet Engineering Task Force (IETF).

  With reference to FIG. 13, a call connection procedure using SIP will be briefly described. Terminals A and B are VoIP phones that support the SIP protocol, and the SIP proxy server is a call control server that processes SIP messages. The location server is a server that manages the correspondence between terminal IDs (or telephone numbers) and locations (or IP addresses). The registration server receives a registration request from the terminal and performs registration with the location server.

  In the initial state, the terminal A turns on the power, connects to the network, and transmits the contact address together with the REGISTER message to the registration server. The contact address is the IP address of terminal A. The registration server registers terminal A with the location server and transmits 200 OK to terminal A. Thus, registration of terminal A is completed. The same applies to registration of terminal B. Both terminal A and terminal B are in a standby state.

  A case where terminal A calls terminal B will be described. Terminal A transmits the ID of called terminal B together with the INVITE message to the SIP proxy server. The SIP proxy server transmits the ID of the called terminal B included in the INVITE message to the location server together with the QUERY message, and returns 100 Trying to the terminal A. The location server returns a contact address corresponding to the ID of terminal B together with the RESPONSE message to the SIP proxy server. The SIP proxy server sends an INVITE message to terminal B having the contact address. When the SIP proxy server receives 180 Ringing from terminal B, it transmits it to terminal A.

  When the SIP proxy server receives 200 OK from terminal B, it transmits it to terminal A. Terminal A transmits ACK to terminal B, and the call connection is completed.

  Another example of a call connection procedure using SIP will be briefly described with reference to FIG. In this example, terminal A calls terminal B when terminal A is registered but terminal B is not registered. Terminal A transmits the ID of called terminal B together with the INVITE message to the proxy server. The SIP proxy server transmits the ID of the called terminal B included in the INVITE message to the location server together with the QUERY message, and returns 100 Trying to the terminal A. The location server returns “Not Signed IN” with the RESPONSE message. The SIP proxy server returns “480 Temprary Unavailable” to terminal A, assuming that connection to terminal B is impossible.

  Japanese Patent Application Laid-Open No. 2003-143323 describes a system that can provide an inexpensive telephone communication service by connecting a VoIP telephone system and a general telephone line. In this example, when a call can be made by a VoIP phone, the call is connected to the other party by a VoIP phone, and when a call cannot be made by a VoIP phone, the call is connected by a general telephone line. However, even when connecting with a general telephone line, an inexpensive service is provided by sending an audio signal to an exchange station near the other party using an IP network.

  Japanese Patent Laid-Open No. 2002-199426 describes a communication system connection method and a connection switching method in a plurality of different wireless communication systems. This document proposes a technique for seamlessly switching (handing over) a connection between different wireless communication systems.

JP 2002-199426 A JP 2003-143323 A

  The above-mentioned document describes a communication system connection method and a connection switching method in a plurality of different wireless communication systems, but mainly for the purpose of seamless connection, and does not describe power saving of communication terminals. .

  When a public wireless LAN service such as a hot spot is used, the power consumption of the communication terminal is relatively large. In particular, how to reduce power consumption in the standby state is a problem. Even if the standby current is reduced by making full use of the standby control technology, it is impossible to set the current value to “0”.

  Furthermore, compared with the service area of a general cellular mobile communication system, the service area of a wireless LAN communication system is mainly a hot spot such as a company, a station, a store, a hotel, a home, and is narrow.

Therefore, in a dual communication terminal that can support both a cellular wireless communication system and a wireless LAN communication system, the power supply for the wireless LAN communication system is set so as not to wait rather than reducing the standby current of the wireless LAN communication system. It is desirable to turn it off completely.
However, the incoming call from the wireless LAN communication system cannot be recognized.

  An object of the present invention is to reduce power consumption during standby in a dual communication terminal.

  An object of the present invention is to provide a control method for a wireless communication system capable of detecting an incoming call even if a power supply for the wireless LAN communication system is turned off in a dual communication terminal.

According to the present invention, in a wireless communication system connectable to a wireless communication system of another different communication method via a network connection unit,
Having a number comparison table database storing the correspondence between the telephone number of the wireless communication system of the communication terminal and the telephone number of the other wireless communication system,
When there is a call from the calling communication terminal to the called communication terminal that can be connected to both the wireless communication system and the other wireless communication system via the wireless communication system,
By obtaining the telephone number of the other wireless communication system of the called communication terminal from the number comparison table database, and calling the obtained telephone number via the other wireless communication system, the called party The communication terminal is notified of the incoming call.

  According to the present invention, in a communication terminal connectable to a plurality of different wireless communication systems, in a standby state, only the first wireless communication system power supply is turned on and the other wireless communication system power supplies are turned on. All communication system power supplies are turned off, and notification of an incoming call is received via the first wireless communication system.

  According to the present invention, in a communication terminal connectable to at least two different wireless communication systems including the first and second wireless communication systems, the communication terminal connectable to the first and second wireless communication systems. When the user makes a call to the called communication terminal from the telephone number of the second wireless communication system, the telephone number of the first wireless communication system and the second wireless communication system A telephone number of the first wireless communication system corresponding to the telephone number that has been called is retrieved from a number comparison table database that stores correspondences of telephone numbers, and the telephone number of the first wireless communication system is called. As a result, the callee is notified that the call has been made via the second wireless communication system.

According to the present invention, in a wireless communication system connectable to a wireless communication system of another different communication method via a network connection unit,
When there is a call from the calling communication terminal to the called communication terminal that can be connected to both the wireless communication system and the other wireless communication system via the wireless communication system,
An IP address corresponding to the telephone number of the other wireless communication system of the called communication terminal is obtained, and the incoming call is notified to the called communication terminal by the VoIP telephone using the obtained IP address. To do.

According to the present invention, in a wireless communication system connected to another wireless communication system having a different communication method via a network connection unit,
A call control server for managing calls, a location registration management server for managing location registration, and a number comparison table storing the correspondence between the telephone number of the communication system and the telephone number of the other wireless communication system. A database, and
The call control server, when a call is made from a caller communication terminal to a callee communication terminal connectable to both the radio communication system and the other radio communication system,
By obtaining the telephone number of the other wireless communication system of the called communication terminal from the number comparison table database, and calling the obtained telephone number via the other wireless communication system, the called party The communication terminal is notified of the incoming call.

  In a dual communication terminal, power consumption during standby can be greatly reduced. In particular, the power consumption during standby of the wireless LAN communication system is larger than the power consumption during standby of the cellular mobile communication system, so by eliminating this power consumption, the overall power consumption is reduced to about 1/2 or less. be able to. Therefore, the standby time is more than doubled.

  FIG. 1 shows an overall configuration of a wireless communication system using a communication terminal according to an embodiment of the present invention. The wireless communication system of this example includes first and second wireless communication systems 100 and 200, a network connection unit 30, and a number comparison table database 31. The first communication terminal 10 is a called communication terminal, and the second communication terminal 20 is a calling communication terminal. The called communication terminal 10 is a dual-type communication terminal having antennas 11 and 12 for the first and second wireless communication systems and corresponding to the two wireless communication systems 100 and 200. The communication terminal 20 on the calling side has at least the antenna 21 for the second wireless communication system and is a communication terminal compatible with at least the second wireless communication system 200. The communication terminal 20 on the calling side is a dual-type communication terminal in the examples of FIGS. The number comparison table database 31 records the correspondence between the telephone number of the first wireless communication system and the telephone number of the second wireless communication system of the called communication terminal 10.

  The first wireless communication system 100 includes a call control server 101, a location registration management server 102, a base station 103, and an antenna 104, and is connected to the network connection unit 30. The second wireless communication system 200 includes a call control server 201, a location registration management server 202, a base station 203, and an antenna 204, and is connected to the network connection unit 30.

  The first wireless communication system 100 may be a W-CDMA (Wideband Code Division Multiple Access) cellular mobile communication system that realizes a data transmission rate of a maximum of 384 kbps and is compatible with high-speed movement. However, the first radio communication system 100 may be any type of communication system as long as broadband wireless communication is possible, and is another cellular type mobile communication system such as GSM (Global System Mobile Communications). It's okay.

  The second wireless communication system 200 may be a wireless LAN (Local Area Network) communication system conforming to the IEEE802.11b, IEEE802.11a, and IEEE802.11g standards that can realize a data transmission rate of 54 Mbps at a maximum with low-speed movement. However, the second wireless communication system 200 may be any type of communication system as long as high-speed wireless communication is possible, and a next-generation UWB (Ultra WideBand) wireless LAN communication system with a transmission rate exceeding 100 Mbps. It may be.

  The first communication terminal 10 on the called side can be connected to both the W-CDMA cellular mobile communication system and the wireless LAN communication system. The second communication terminal 20 on the calling side can be connected to at least a wireless LAN communication system.

  The second communication terminal on the calling side may be a communication terminal compatible with a W-CDMA cellular mobile communication system, a communication terminal compatible with PHS (Personal Handyphone System), a fixed telephone, or the like. For example, when connecting from such a communication terminal to a wireless LAN communication system, it is necessary to connect to the wireless LAN communication system via each W-CDMA cellular mobile communication system network, PHS communication network, and fixed telephone communication network. Become.

  In the example of FIG. 1, the number comparison table database 31 is connected to the network connection unit 30, but the number comparison table database 31 is provided at an arbitrary location. For example, the number comparison table database 31 may be provided in the second radio communication system 200 or may be provided in the communication terminal 20 on the calling side.

  A network of the first and second wireless communication systems will be described with reference to FIG. FIG. 2 shows cell ranges of the first and second wireless communication systems. The description will be made assuming that the first wireless communication system is a W-CDMA cellular mobile communication system, and the second wireless communication system is a wireless LAN communication system. The first wireless communication system has a large number of relatively large cell ranges 100A, 100B, 100C, 100D and covers a wide service area. Each cell of the first wireless communication system is provided with a base station and antennas 100a, 100b, 100c, and 100d of the first wireless communication system.

  Similarly, the second wireless communication system has relatively small cell ranges 200A, 200B, 200C, and 200D, and these cell ranges exist in spots. Therefore, the service area is locally limited. Each cell of the second wireless communication system is provided with a base station and antennas 200a, 200b, 200c, and 200d of the second wireless communication system.

  With reference to FIG. 3, the example of a structure of the dual-type communication terminal 10 by this invention is demonstrated. The communication terminal 10 of this example includes an antenna 301 (11 in FIG. 1) that receives a radio signal of the first radio communication system, an antenna 302 (12 in FIG. 1) that receives a radio signal of the second radio communication system, First wireless communication system transmission / reception circuit unit 303 that performs processing related to signals transmitted / received via antenna 301, second wireless communication system transmission / reception circuit unit 304 that performs processing related to signals transmitted / received via antenna 302, first wireless Power supply 305 capable of turning on / off power supply voltage of communication system transmission / reception circuit unit 303 and other components of the first wireless communication system, second wireless communication system transmission / reception circuit unit 304, and other components of the second wireless communication system The power supply 306 capable of turning on and off the power supply voltage of the components of the first and second wireless communication systems A common circuit unit 307 that performs common signal processing, a control unit 308 that performs on / off of the power supply voltage of the two power supplies 305 and 306, and other controls, an input unit 309 such as a key and a button, and an output unit 310 such as a display. Have

  The communication terminal 20 on the calling side is a dual-type communication terminal in the examples of FIGS. In this case, the configuration of the communication terminal 20 on the calling side may be the same as the configuration of FIG.

  Hereinafter, a procedure regarding communication connection when performing communication from the second communication terminal 20 to the first communication terminal 10 will be described in detail.

[First embodiment]
With reference to FIG. 4, a communication line connection procedure when communication is performed from the second communication terminal 20 to the first communication terminal 10 will be described. The calling-side second communication terminal 20 has a function of performing communication via the second wireless communication system, and the called-side first communication terminal 10 is connected via the first and second wireless communication systems. This is a dual-type communication terminal. The second communication terminal 20 on the calling side is within the range of the second radio communication system, and the first communication terminal 10 on the call side is within the range of the first and second radio communication systems.

  In step S401, as the initial state, the power supply for the second wireless communication system of the communication terminal 20 on the calling side is on. Since the calling communication terminal 20 is within the range of the second wireless communication system, location registration to the location registration management server 202 of the second wireless communication system is performed in step S402. When the location registration is completed, the calling communication terminal 20 enters a standby state.

  On the other hand, in step S403, as an initial state, the second wireless communication system power supply 306 (FIG. 3) of the called communication terminal 10 is off and the first wireless communication system power supply 305 (FIG. 3) is off. Is on. Since the called communication terminal 10 is within the range of the first wireless communication system, the location registration to the location registration management server 102 of the first wireless communication system is performed in step S404. When the location registration is completed, the called communication terminal 10 enters a standby state. Note that location registration in the location registration management server 202 of the second wireless communication system is not performed.

  First, in step S405, the caller performs a call operation from the second communication terminal 20 to the telephone number of the second wireless communication system of the first communication terminal 10. In step S406, the call control server 201 of the second wireless communication system requests the location registration management server 202 to confirm whether the location registration of the communication terminal 10 on the called side is performed. In step S407, the location registration management server 202 determines that location registration of the called communication terminal 10 has not been performed, and notifies the call control server 201 that connection is not possible.

  Therefore, in step S408, the call control server 201 of the second wireless communication system accesses the number comparison table database 31 to obtain the telephone number of the first wireless communication system of the called communication terminal 10. Obtain. In step S409, the call control server 201 of the second wireless communication system transmits the acquired telephone number of the first wireless communication system to the call control server 101, so that the second communication terminal 20 receives the telephone number. Notify the call. In step S410, the call control server 101 of the first radio communication system determines whether or not the location registration of the communication terminal 10 on the called side is performed in the location registration management server 102 of the first radio communication system. Request confirmation. In step S411, the location registration management server 102 determines that the location registration of the called communication terminal 10 has been performed, and notifies the call control server 101 that connection is possible. In step S412, the call control server 101 of the first wireless communication system notifies the call terminal side communication terminal 10 of the call via the second wireless communication system.

  This notification is for notifying the called communication terminal 10 that there has been a call via the second wireless communication system. This notification needs to be distinguished from the notification for notifying that there is a call via the normal first wireless communication system. In this example, in order to distinguish the two, information for distinguishing which radio communication system is used for the call is transmitted to the downlink control channel of the first radio communication system, for example, on the downlink control channel of the upper layer. Add and send. Of course, it is also possible to put this information by changing the downlink physical channel format. Since this is a notification for notifying an incoming call, information to that effect is transmitted on the downlink control channel.

  The called communication terminal 10 extracts information for distinguishing the call from the control channel of the received signal. When determining that the call is made via the second wireless communication system, the communication terminal 10 on the called side turns on the second wireless communication system power supply 306 (FIG. 3) in step S413. If the call is via the normal first wireless communication system, the called communication terminal 10 performs connection processing via the first wireless communication system.

  In step S414, the called communication terminal 10 performs location registration with the location registration management server 202 of the second wireless communication system. In step S415, the call-side communication terminal 10 has completed location registration in the call control server 101 of the first wireless communication system, location registration management server 202 of the second wireless communication system, and It is notified that incoming calls via the first wireless communication system after this will be rejected. Similarly, in step S416, the call control server 101 of the first wireless communication system transfers the call control server 201 of the second wireless communication system to the location registration management server 202 of the second wireless communication system. The location registration of the called communication terminal 10 is completed, and the called communication terminal 10 notifies that the incoming call via the first wireless communication system after this is rejected.

  In step S417, the call control server 201 of the second wireless communication system disconnects from the first wireless communication system, and the location registration management server 202 sends the second communication terminal 10 of the called communication terminal 10 to the second wireless communication system. Request confirmation of location registration in the wireless communication system. In step S418, the location registration management server 202 confirms that the location of the called communication terminal 10 is registered in the second wireless communication system, and notifies the call control server 201 that connection is possible. In step S419, the call control server 201 makes a call to the called communication terminal 10 via the second wireless communication system. In the communication terminal 10 on the called side, the incoming call sound of the second wireless communication system is emitted. When the called party performs an incoming call operation via the second wireless communication system, the calling communication terminal 20 and the called communication terminal 10 perform the second wireless communication in steps S420 and S421. Connection is completed through the system.

  With reference to FIG. 5, another example of a communication line connection procedure when communication is performed from the second communication terminal 20 to the first communication terminal 10 will be described. In this example, the calling communication terminal 20 is within the second wireless communication system and the called communication terminal 10 is within the first wireless communication system. It is out of range. This example differs from the example of FIG. 4 in that the called communication terminal 10 is outside the range of the second wireless communication system.

  Steps S501 to S513 are the same as S401 to S413 in FIG. In the communication terminal 20 on the calling side, the location registration in the location registration management server 202 of the second wireless communication system has been completed. In the communication terminal 10 on the called side, the location registration to the location registration management server 102 of the first wireless communication system is completed, but the location registration to the location registration management server 202 of the second wireless communication system is not performed. I have not been told. The power supply 306 for the second wireless communication system of the called communication terminal 10 is on, and the power supply 305 for the first wireless communication system is on.

  Steps S514 and after will be described. In step S514, the base station 203 (FIG. 1) of the second wireless communication system is searched for location registration. However, since the called communication terminal 10 is outside the range of the second wireless communication system, it cannot be connected to the network of the second wireless communication system. Therefore, in step S515, the call control server 101 of the first wireless communication system is notified that the location registration of the called communication terminal 10 cannot be performed. For example, information indicating that location registration cannot be performed is transmitted on the uplink control channel of the first wireless communication system, for example, on the uplink control channel of the upper layer. In step S516, the call control server 101 of the first wireless communication system transmits a notification that the location registration of the called communication terminal 10 cannot be performed to the call control server 201 of the second wireless communication system. To do.

  In step S517, the call control server 201 in the second wireless communication system is located in the calling communication terminal 20, and the called communication terminal 10 is located in the location registration management server 202 in the second wireless communication system. Notifying that registration cannot be performed, and requesting selection of whether to disconnect as it is or to connect with the first wireless communication system. In step S518, the power supply 306 for the second radio communication system of the called communication terminal 10 is turned off.

  In step S519, the calling communication terminal 20 selects connection in the first wireless communication system. In step S520, the calling communication terminal 20 notifies the call control server 201 of the second wireless communication system that the first wireless communication system is connected. In step S521, the call control server 201 of the second wireless communication system notifies the call control server 101 of the first wireless communication system that the first wireless communication system is connected. For example, the information is transmitted on the downlink control channel of the first wireless communication system. In step S522, the call control server 101 of the first radio communication system notifies the callee communication terminal 10 that the caller communication terminal 20 is connected by the first radio communication system. At this time, the incoming call sound of the first wireless communication system of the called communication terminal 10 sounds. In steps S523 to S525, the callee performs an incoming call operation via the first wireless communication system, so that the first caller communication terminal 20 and the callee communication terminal 10 receive a first call. The connection is completed via the wireless communication system.

  In step S519, the calling communication terminal 20 selects connection in the first wireless communication system. This selection may be performed manually by the caller, or may be performed automatically by registering this selection in advance in the communication terminal 20 on the calling side.

  In step S519, when the caller selects to disconnect as it is, the communication terminal 20 on the calling side notifies the call control server 201 of the second wireless communication system that the call is disconnected. Disconnect from. The call control server 201 of the second wireless communication system disconnects the connection of the called communication terminal 10 via the first wireless communication system.

  According to the above-described example, in steps S403 and S503, the first wireless communication system power supply 305 of the called communication terminal 10 is on, but the second wireless communication system power supply 306 is off. The power consumption of the second wireless communication system is larger than the power consumption of the first wireless communication system. Therefore, at the time of standby, it is possible to reduce the power consumption of the communication terminal 10 as a whole to about 1/2 or less, and the standby time becomes about twice or more.

  Furthermore, although the power supply 306 for the second wireless communication system of the called communication terminal 10 is off, since the connection process is performed via the first wireless communication system, in the example of FIG. An incoming call can be made via the communication system.

  In the above-described example, when connection from the calling communication terminal 20 to the called communication terminal cannot be established via the second wireless communication system, the first wireless communication is performed with the calling communication terminal 20. We are checking whether it is OK to connect via the system. However, it may be automatically connected to the first wireless communication system as in the second embodiment described below. Further, as in the third embodiment, information on whether or not to connect to the first wireless communication system may be transmitted from the calling communication terminal 20 at the time of calling.

[Second Embodiment]
With reference to FIG. 6, a communication line connection procedure when communication is performed from the second communication terminal 20 to the first communication terminal 10 will be described. In this example, the calling communication terminal 20 has a function of performing communication via the second wireless communication system, and the called communication terminal 10 communicates via the first and second wireless communication systems. This is a dual communication terminal. The calling communication terminal 20 is within the second wireless communication system, and the called communication terminal 10 is within the first and second wireless communication systems.

  Steps S601 to S608 are the same as S401 to S408 in FIG. In step S609, the call control server 201 of the second wireless communication system transmits the telephone number of the first wireless communication system obtained from the number comparison table database 31 to the call control server 101 and disconnects the communication. . In step S610, the call control server 101 of the first wireless communication system determines whether or not the location registration management server 102 has registered the location of the first wireless communication system of the communication terminal 10 on the called side. Request confirmation. In step S611, the location registration management server 102 determines that the location registration of the called communication terminal 10 has been performed, and notifies the call control server 101 that connection is possible. In step S612, the call control server 101 of the first wireless communication system makes a call via the second wireless communication system to the called communication terminal 10 via the network of the first wireless communication system. Notify and disconnect the connection via the first wireless communication system.

  This notification is a notification for notifying the called communication terminal 10 that there has been a call via the second wireless communication system. This notification needs to be distinguished from the notification for notifying that there is a call via the normal first wireless communication system.

  In this example, in order to distinguish both, the number of calls of the communication terminal 10 on the called side is set to two. For example, if the number of calls is only one and the incoming call is disconnected, this indicates that there is an incoming call via the second wireless communication system. On the other hand, when the number of calls is two or more, it indicates an incoming call via the normal first wireless communication system. In this way, when the incoming call path is distinguished based on the number of calls, the terminal side may perform processing so that the first ringing tone is not sounded. In this embodiment, since it is a call for notifying an incoming call via the second wireless communication system, a call is made only once, and then a disconnection process with the network of the first wireless communication system is performed.

  In step S613, the call control server 201 of the second wireless communication system enters a state of waiting for location registration from the called communication terminal 10 to the location registration management server 202 of the second wireless communication system. In step S614, the called communication terminal 10 determines that there is an incoming call via the second wireless communication system because the incoming call is disconnected in one call, and the second wireless communication system The power supply 306 (FIG. 3) is turned on.

  In step S615, since the called communication terminal 10 is within the range of the second wireless communication system, the location registration is performed with the location registration management server 202 of the second wireless communication system. Here, if it cannot be detected even after searching for a base station for a predetermined maximum search time Ts, it is regarded as out of service area. This case will be described later with reference to FIG.

  In step S616, the call control server 201 of the second wireless communication system that has been in the position registration waiting state returns to the location registration management server 202 again to the second wireless communication system of the communication terminal 10 on the called side. Request confirmation of location registration. The confirmation request is made again after a predetermined maximum waiting time Tw after the call to the first wireless communication system in step S609. In addition, you may perform control which tries to confirm position registration several times during maximum waiting time Tw.

  In step S617, when the location registration management server 202 confirms that the location of the called communication terminal 10 is registered in the second wireless communication system, the location registration management server 202 notifies the call control server 201 that connection is possible. In step S618, the call control server 201 of the second wireless communication system makes a call to the called communication terminal 10 via the second wireless communication system. At this time, the incoming call sound of the second wireless communication system of the called communication terminal 10 sounds. In S619 and S620, when the called party performs an incoming call operation via the second wireless communication system, the second wireless communication between the calling communication terminal 20 and the called communication terminal 10 is performed. The connection is completed via the communication system.

  In step S617, if the location registration management server 202 determines that the location of the called communication terminal 10 is not registered in the location registration management server 202 of the second wireless communication system, the second wireless communication The call control server 201 of the system determines that the called communication terminal 10 is outside the range of the second wireless communication system. This case will be described later with reference to FIG.

  With reference to FIG. 7, another example of the communication line connection procedure when communication is performed from the calling communication terminal 20 to the called communication terminal 10 will be described. In this example, the calling communication terminal 20 is within the second wireless communication system and the called communication terminal 10 is within the first wireless communication system. It is out of range. This example differs from the example of FIG. 6 in that the called communication terminal 10 is outside the range of the second wireless communication system.

  Steps S701 to S714 are the same as S601 to S614 in FIG. In the communication terminal 20 on the calling side, the location registration in the location registration management server 202 of the second wireless communication system has been completed. In the communication terminal 10 on the called side, the location registration to the location registration management server 102 of the first wireless communication system is completed, but the location registration to the location registration management server 202 of the second wireless communication system is not performed. I have not been told. The power supply 306 for the second wireless communication system of the called communication terminal 10 is on, and the power supply 305 for the first wireless communication system is on.

  Steps S715 and after will be described. In step S715, the called communication terminal 10 searches the base station 203 (FIG. 1) of the second wireless communication system and tries to register the location in the location registration management server 202. However, since it is out of range of the second wireless communication system, it cannot be connected to the second wireless communication system. If it cannot be detected even after searching for a predetermined base station search time Ts, it is determined that the second radio communication system is out of range in step S716, and the second radio communication system power supply 306 is turned off as it is. To. Here, in order to reduce the power consumption of the second wireless communication system of the called communication terminal 10 as much as possible, it is desirable to satisfy Ts ≦ Tw.

  In step S717, the call control server 201 of the second wireless communication system that has been in the position registration waiting state returns the position registration management server 202 to the second wireless communication system of the called communication terminal 10 again. Request confirmation of location registration. This confirmation request is made after a predetermined maximum waiting time Tw after making a call to the first wireless communication system.

  In step S718, the location registration management server 202 determines that the location registration of the called communication terminal 10 in the second wireless communication system has not been performed, and notifies the call control server 201 that connection is not possible. To do. In steps S719 to S722, the call control server 201 of the second wireless communication system determines that the called communication terminal 10 is out of the range of the second wireless communication system, and again performs the first wireless communication. Make a call to the system phone number.

  Steps S719 to S722 are basically the same as steps S709 to S712 (steps S609 to S612 in FIG. 6). However, steps S709 to S712 are processing for notifying the called communication terminal 10 of the call via the second wireless communication system via the first wireless communication system. Steps S719 to S722 are processing for notifying the called communication terminal 10 of the call via the normal first wireless communication system via the first wireless communication system.

  In step S722, the call control server 101 of the first wireless communication system sends a call from the calling communication terminal 20 to the called communication terminal 10 via the network of the first wireless communication system. To be notified.

  This notification is a notification for notifying the called communication terminal 10 that there has been a call via the original first wireless communication system. Therefore, the number of calls is two or more. At this point, that is, after the second call, the ringing tone of the first wireless communication system of the called communication terminal sounds. In steps S723 to S725, the caller performs an incoming call operation via the first wireless communication system, so that the first caller communication terminal 20 and the callee communication terminal 10 receive a first call. The connection is completed via the wireless communication system.

  According to the above-described example, in steps S603 and S703, the first wireless communication system power supply 305 of the called communication terminal 10 is on, but the second wireless communication system power supply 306 is off. The power consumption of the second wireless communication system is larger than the power consumption of the first wireless communication system. Therefore, at the time of standby, it is possible to reduce the power consumption of the communication terminal 10 as a whole to about 1/2 or less, and the standby time becomes about twice or more.

  Further, the power supply 306 for the second wireless communication system of the called communication terminal 10 is off, but since the connection process is performed via the first wireless communication system, the caller must A call can be made via the communication system. Further, in the present embodiment, it is not necessary to place or change special information on the control channel of the first wireless communication system as in the first embodiment, and the impact on the first wireless communication system is reduced. It can be made smaller.

  In the above-described example, when connection cannot be established from the calling communication terminal 20 to the called communication terminal via the second wireless communication system, the connection is automatically made to the first wireless communication system. However, as in the first embodiment, it may be confirmed whether or not the calling communication terminal 20 can be connected via the first wireless communication system. Further, as in the third embodiment, information on whether or not to connect to the first wireless communication system may be transmitted from the calling communication terminal 20 at the time of calling.

[Third embodiment]
With reference to FIG. 8, a communication line connection procedure when communication is performed from the second communication terminal 20 to the first communication terminal 10 will be described. In this example, both the calling and called communication terminals 20 and 10 have a function of performing communication via the first and second wireless communication systems. That is, the communication terminals 20 and 10 on the calling side and the called side are both dual type communication terminals. The calling communication terminal 20 is within the first and second wireless communication systems, and the called communication terminal 10 is within the first wireless communication system, but out of the second wireless communication system. It is in.

  In Step S801, as an initial state, the power supply for the second wireless communication system of the communication terminal 20 on the calling side is off and the power supply for the first wireless communication system is on. Since the calling communication terminal 20 is within the range of the first wireless communication system, the location registration to the location registration management server 102 of the first wireless communication system is performed in step S802. When the location registration is completed, the calling communication terminal 20 enters a standby state. Note that location registration in the location registration management server 202 of the second wireless communication system is not performed.

  Similarly, in step S803, as an initial state, the second wireless communication system power supply 306 (FIG. 3) of the called communication terminal 10 is off and the first wireless communication system power supply 305 (FIG. 3) is turned off. ) Is on. Since the called communication terminal 10 is within the range of the first wireless communication system, location registration to the location registration management server 102 of the first wireless communication system is performed in step S804. When the location registration is completed, the called communication terminal 10 enters a standby state. Note that location registration in the location registration management server 202 of the second wireless communication system is not performed.

  First, in step S805, the calling party turns on the power supply for the second wireless communication system of the communication terminal 20 on the calling side. In step S806, the calling communication terminal 20 performs location registration in the location registration management server 202 of the second wireless communication system.

  In step S807, the calling party uses the second wireless communication system of the calling communication terminal 20 to make a call to the telephone number of the second wireless communication system of the called communication terminal 10. Perform call operations. In this example, the calling communication terminal 20 simultaneously transmits a processing method in the case where a call cannot be connected to the called communication terminal 10 via the second wireless communication system. For example, it is “disconnect as it is”, “the caller is connected to the second wireless communication system and is connected via the first wireless communication system”, or “the caller is also connected to the first wireless communication system. “Switch to the wireless communication system and connect via the first wireless communication system” is transmitted in advance.

  In this example, in the following, when the second wireless communication system cannot be connected in step S807, “the caller also switches to the first wireless communication system and passes through the first wireless communication system. A case where the information “connect” is transmitted will be described.

  Steps S808 to S815 are the same as steps S406 to S413 in FIG. In step S815, the communication terminal 10 on the called side extracts route information for distinguishing the route of the call from the control channel of the received signal, as in the first embodiment of FIG. When the route information indicates that the incoming call is via the second wireless communication system, the called communication terminal 10 turns on the second wireless communication system power supply 306 (FIG. 3). When the route information indicates an incoming call via the original first wireless communication system, a connection process with the first wireless communication system is normally performed. In this example, a case will be described below in which the power supply for the second wireless communication system of the called communication terminal 10 is turned on in step S815.

  Steps S816 to S818 are the same as steps S514 to S516 in FIG. In step S819, the called communication terminal 10 turns off the second radio communication system power supply 306. In step S820, the call control server 201 of the second wireless communication system performs processing based on information acquired in advance from the communication terminal 20 on the calling side. In this example, when the connection via the second wireless communication system is not possible, “the calling side also switches to the connection via the first wireless communication system and performs the connection via the first wireless communication system”. Information is acquired in advance. Accordingly, first, in step S820, the call control server 201 of the second wireless communication system disconnects the connection with the called communication terminal 10 via the first wireless communication system. In step S821, the call control server 101 of the first wireless communication system disconnects the connection with the called communication terminal 10 via the first wireless communication system. At the same time, in step S822, the call control server 201 of the second wireless communication system instructs the calling communication terminal 20 to call the telephone number of the first wireless communication system and disconnects it. .

  In step S823, the calling communication terminal 20 turns off the second wireless communication system power supply 306. In step S824, the calling communication terminal 20 calls the telephone number of the first wireless communication system of the called communication terminal 10. This call operation may be performed manually by the caller or automatically. In step S825, the call control server 101 of the first wireless communication system requests the location registration management server 102 to confirm whether the location of the called communication terminal 10 is registered. In step S826, the location management server 102 determines that the location of the called communication terminal 10 is registered, and notifies the call control server 101 that connection is possible. In step S827, the call control server 101 of the first wireless communication system makes a call to the called communication terminal 10 via the first wireless communication system. At this time, the ringing tone of the communication terminal 10 on the called side sounds. In steps S828 to S829, the called party performs an incoming call operation via the first wireless communication system, so that the first communication terminal 20 and the called communication terminal 10 receive the first call. The connection via the wireless communication system is completed.

  According to this example, in step S803, the first wireless communication system power supply 305 of the called communication terminal 10 is on, but the second wireless communication system power supply 306 is off. The power consumption of the second wireless communication system is larger than the power consumption of the first wireless communication system. Therefore, at the time of standby, it is possible to reduce the power consumption of the communication terminal 10 as a whole to about 1/2 or less, and the standby time becomes about twice or more.

  Furthermore, the power supply 306 for the second wireless communication system of the called communication terminal 10 is off, but a call can be connected via the first wireless communication system. This embodiment is effective when it is desired to establish a connection between the first wireless communication systems when a connection cannot be established with the second wireless communication system.

  In the above-described example, the communication terminal 20 on the calling side transmits information on whether or not to connect to the first wireless communication system at the time of calling. When connection from the calling communication terminal 20 to the called communication terminal could not be established via the second wireless communication system, the connection to the first wireless communication system was established based on the information at the time of calling. . However, as in the first embodiment, it may be confirmed whether or not the calling communication terminal 20 can be connected via the first wireless communication system. Moreover, you may connect to a 1st radio | wireless communications system automatically like 2nd Embodiment.

  In the first to third embodiments described above, the telephone number of the second wireless communication system of the called communication terminal 10 and the first wireless communication system are stored in the number comparison table database connected to the network connection unit 30. The telephone number comparison table is stored, and the call control server of the second wireless communication system obtains the telephone number of the first wireless communication system by accessing the number comparison table database. However, the calling communication terminal may be provided with a number comparison table database. In this case, the communication terminal on the calling side transmits a paired telephone number at the time of calling. Further, the telephone numbers of the first and second wireless communication systems may be set to be the same. For example, when the telephone number of the first wireless communication system is 090-1234-5678, the telephone number of the second wireless communication system is set to 050-1234-5678.

[Fourth Embodiment]
With reference to FIG. 9, a communication line connection procedure when communication is performed from the second communication terminal 20 to the first communication terminal 10 will be described. In this example, both the calling and called communication terminals 20 and 10 have a function of performing communication via the first and second wireless communication systems. That is, the communication terminals 20 and 10 on the calling side and the called side are both dual type communication terminals. The calling communication terminal 20 is within the first and second wireless communication systems, and the called communication terminal 10 is within the first and second wireless communication systems. In this example, the number comparison table database is built in the communication terminal on the calling side.

  In step S901, as an initial state, the power supply for the second wireless communication system of the calling communication terminal 20 is off and the power supply for the first wireless communication system is on. Since the calling communication terminal 20 is within the range of the first wireless communication system, location registration to the location registration management server 102 of the first wireless communication system is performed in step S902. When the location registration is completed, the calling communication terminal 20 enters a standby state. Note that location registration in the location registration management server 202 of the second wireless communication system is not performed.

  Similarly, in step S903, as an initial state, the second wireless communication system power supply 306 (FIG. 3) of the called communication terminal 10 is off, and the first wireless communication system power supply 305 (FIG. 3) is turned off. ) Is on. Since the called communication terminal 10 is within the range of the first wireless communication system, the location registration to the location registration management server 102 of the first wireless communication system is performed in step S904. When the location registration is completed, the called communication terminal 10 enters a standby state. Note that location registration in the location registration management server 202 of the second wireless communication system is not performed.

  The caller performs a call operation to the telephone number of the second wireless communication system of the called communication terminal 10 using the second wireless communication system of the second communication terminal 20. At this time, the calling communication terminal 20 actually performs the following operation.

  In step S905, as the operation of the first wireless communication system, the telephone number of the first wireless communication system of the called communication terminal 10 is obtained from the built-in number comparison table database. Steps S906 to S909 are basically the same as steps S609 to S612 in FIG. That is, the calling communication terminal 20 notifies the called communication terminal that a call has been made via the second wireless communication system via the first wireless communication system. Here, a call to the second wireless communication system is notified, and the number of calls is only once. The call is made only once and the connection via the first wireless communication system is disconnected. The difference from steps S609 to S612 in FIG. 6 is that the calling communication terminal 20 directly notifies the called communication terminal that a call has been made via the second wireless communication system. Thus, the impact of the second wireless communication system is eliminated.

  In step S910, the communication terminal 20 on the calling side first prepares to make a call via the second wireless communication system as the operation of the second wireless communication system. That is, the second wireless communication system power supply 306 is turned on. In step S911, the calling communication terminal 20 performs location registration with the location registration management server 202 of the second wireless communication system. In step S912, the calling communication terminal 20 is in a waiting state until the called communication terminal 10 performs location registration with the location registration management server 202 of the second wireless communication system. The operation of the first wireless communication system (S905 to S909) and the operation of the second wireless communication system (S910 to S912) of the calling communication terminal 20 are performed in parallel.

  On the other hand, in step S913, the incoming communication terminal 10 receives the incoming call via the second wireless communication system because the incoming call via the first wireless communication system is disconnected by one call. It is determined that there is, and the second wireless communication system power supply 306 is turned on. However, the communication terminal on the called side does not sound the first ringing tone but sounds from the second ringing tone.

  In step S914, the called communication terminal 10 performs location registration with the location registration management server 202 of the second wireless communication system. In step S915, the calling communication terminal 20 calls the telephone number of the second wireless communication system of the called communication terminal 10 via the second wireless communication system. This call is made after a predetermined maximum waiting time Tw after the location registration to the location registration management server 202 of the second wireless communication system in step S911.

  In step S916, the call control server 201 of the second wireless communication system is registered in the location registration management server 202 and the called communication terminal 10 is registered in the location registration management server 202 of the second wireless communication system. Request confirmation of whether or not In step S917, the location registration management server 202 of the second wireless communication system confirms the location registration and notifies the call control server 201 that connection is possible. In step S918, the call control server 201 of the second wireless communication system transmits a call to the called communication terminal 10 via the second wireless communication system.

  At this time, the incoming call sound of the second wireless communication system of the called communication terminal 10 sounds. In steps S919 and S920, the callee performs an incoming call operation via the second wireless communication system, so that the caller communication terminal 20 and the callee communication terminal 10 are connected. Thus, the connection via the second wireless communication system is completed.

  With reference to FIG. 10, a communication line connection procedure when communication is performed from the second communication terminal 20 to the first communication terminal 10 will be described. In this example, the calling communication terminal 20 is within the first and second wireless communication systems, and the called communication terminal 10 is within the first wireless communication system. Out of communication system range. This example is different from the example of FIG. 9 in that the called communication terminal 10 is outside the range of the second wireless communication system.

  Steps S1001 to S1013 are the same as steps S901 to S913 in FIG. Here, step S1014 and subsequent steps will be described. In step S1014, the called communication terminal 10 searches the base station 203. If it cannot be detected even after searching for a base station for a predetermined maximum search time Ts, it is determined in step S1015 that the called communication terminal 10 is out of range of the second wireless communication system, The power supply 306 for the second wireless communication system is turned off.

  On the other hand, in step S1016, the calling communication terminal 20 calls the telephone number of the second wireless communication system of the called communication terminal 10. In step S1017, the call control server 201 of the second wireless communication system requests the location registration management server 202 to confirm whether or not location registration of the called communication terminal 10 has been performed. In step S 1018, the location registration management server 202 determines that the location registration of the called communication terminal 10 has not been performed, and notifies the call control server 201 that connection is not possible. In step S1019, the calling communication terminal 20 determines that the called communication terminal 10 is out of the range of the second wireless communication system, and disconnects the connection. In step S1020, the calling communication terminal 20 turns off the second power supply 306 for the wireless communication system.

  In step S1021, the calling communication terminal 20 obtains the telephone number of the first wireless communication system of the called communication terminal 10 again from the number comparison table database. In steps S1022 to S1025, the calling communication terminal 20 calls the number of the first wireless communication system of the called communication terminal 10. The call at this time is a notification of line connection via the normal first wireless communication system. Therefore, the number of calls is two or more.

  The ringing tone of the call side communication terminal sounds from the second call onward of the normal call via the first wireless communication system of the call side communication terminal. In steps S1026 and S1027, the caller performs an incoming call operation via the first wireless communication system, so that the first caller communication terminal 20 and the callee communication terminal 10 receive a first call. The connection via the wireless communication system is completed.

  In this example, the calling communication terminal automatically establishes connection via the first wireless communication system. However, the caller may be configured to manually select a connection via the first wireless communication system. Further, the call may be disconnected without making a call via the first wireless communication system, and further, the first wireless of the called communication terminal is used by using the second wireless communication system. You may call a communication system number.

  In the fourth embodiment, the communication terminal on the calling side is exemplified as a dual communication terminal capable of communicating via the first and second wireless communication systems. However, as described in the first embodiment, the calling communication terminal may be a wireless LAN communication terminal, a W-CDMA system communication terminal, a PHS terminal, a fixed telephone, or the like. In this case, the original call operation and the call operation for notifying the incoming call cannot be performed in parallel. Accordingly, first, a call is made to notify the incoming call to the telephone number of the first wireless communication system of the called communication terminal, the connection via the first wireless communication system is disconnected, and then the second wireless communication system is disconnected. The original call operation may be performed on the telephone number of the communication system.

  As described above, in the fourth embodiment, it is not necessary to change the network control method of the first and second wireless communication systems, the network connection unit, or the like, and it is only necessary to control the communication terminal on the calling side. Even when the power supply for the second wireless communication system of the communication terminal on the called side is turned off, the incoming call can be made via the second wireless communication system via the first wireless communication system, and the power consumption during standby can be reduced. It can be greatly reduced.

[Fifth Embodiment]
In the first to fourth embodiments, the called communication terminal has the telephone number of the first wireless communication system and the telephone number of the second wireless communication system, The operation when the communication terminal calls the telephone number of the second wireless communication system has been described.

  In the fifth embodiment, the called communication terminal 10 uses only the number assigned as the telephone number of the first wireless communication system. The called communication terminal 10 does not have the telephone number of the second wireless communication system. The number comparison table database 31 is not necessary. As the second wireless communication system, a VoIP telephone using wireless LAN technology is assumed, and the called communication terminal is specified by the IP address associated with the telephone number of the first wireless communication system.

  The location registration management server may be considered as a database that manages the correspondence between the telephone number in the first wireless communication system and the IP address in the second wireless communication system.

  With reference to FIG. 11, a communication line connection procedure when communication is performed from the second communication terminal 20 to the first communication terminal 10 will be described. In this example, the calling communication terminal 20 has a function of performing communication via the second wireless communication system, and the called communication terminal 10 communicates via the first and second wireless communication systems. This is a dual communication terminal. The calling communication terminal 20 is within the second wireless communication system, and the called communication terminal 10 is within the first and second wireless communication systems.

  In step S1101, the communication terminal 20 on the calling side is turned on as an initial state. Since the calling communication terminal 20 is within the range of the second wireless communication system, the location registration to the location registration management server 202 of the second wireless communication system is performed in step S1102. When the location registration is completed, the calling communication terminal 20 enters a standby state.

  On the other hand, in step S1103, as an initial state, the second wireless communication system power supply 306 (FIG. 3) of the called communication terminal 10 is off and the first wireless communication system power supply 305 (FIG. 3) is off. Is on. Since the called communication terminal 10 is within the range of the first wireless communication system, location registration to the location registration management server 102 of the first wireless communication system is performed in step S1104. When the location registration is completed, the called communication terminal 10 enters a standby state. Note that location registration in the location registration management server 202 of the second wireless communication system is not performed.

  First, in step S <b> 1105, the caller performs a call operation from the second communication terminal 20 to the telephone number of the second wireless communication system of the first communication terminal 10. In step S1106, the call control server 201 of the second wireless communication system requests the location registration management server 202 to confirm whether the location registration of the communication terminal 10 on the called side has been performed. That is, it is requested to confirm whether the telephone number of the second wireless communication system of the called communication terminal 10 and the IP address corresponding thereto are registered. Since the power supply 306 for the second wireless communication system of the called communication terminal 10 is off, the IP address is not registered in the location registration management server 202 of the second wireless communication system. In step S1107, the location registration management server 202 determines that the IP address of the called communication terminal 10 is not registered, and notifies the call control server 201 that connection is not possible.

  In steps S 1108 to S 1111, the call control server 201 of the second wireless communication system makes a call to the telephone number of the communication terminal 10 on the called side, thereby receiving the call via the first wireless communication system. An incoming call via the second wireless communication system is notified to the communication terminal 10 on the call side. Since the notification at this time is a notification for notifying an incoming call via the second wireless communication system, as in the second embodiment, the call is made only once and then passed through the first wireless communication system. Disconnect the connection.

  In step S1112, the call control server 201 of the second wireless communication system enters a waiting state for location registration from the called communication terminal 10 to the location registration management server 202 of the second wireless communication system. In step S1113, the communication terminal 10 on the called side determines that there is an incoming call via the second wireless communication system because the connection via the first wireless communication system is disconnected by one call. Then, the power supply 306 (FIG. 3) for the second wireless communication system is turned on.

  In step S1114, the called communication terminal 10 performs location registration with the location registration management server 202 of the second wireless communication system. Here, if it cannot be detected even after searching for a base station for a predetermined maximum search time Ts, it is regarded as out of service area. This case will be described later with reference to FIG.

  In step S1115, the call control server 201 of the second wireless communication system that has been waiting for location registration again returns to the location registration management server 202 to the second wireless communication system of the communication terminal 10 on the called side. Request confirmation of location registration. The request for confirmation of the location registration is made after a predetermined maximum waiting time Tw after making a call to the first wireless communication system in step S1108. If the called communication terminal 10 is not registered in the location registration management server 202 of the second wireless communication system, the call control server 201 of the second wireless communication system The terminal 10 is determined to be outside the range of the second wireless communication system. This case will be described later with reference to FIG. Here, the position registration is confirmed after the maximum waiting time Tw. However, the position registration may be tried several times during the maximum waiting time Tw.

  In step S 1116, the location registration management server 202 of the second wireless communication system confirms that the IP address of the called communication terminal 10 is registered, and notifies the call control server 201 that connection is possible. I do. In step S1117, the call control server 201 of the second wireless communication system issues a call to the second wireless communication system of the called communication terminal 10. At this time, the incoming call sound of the second wireless communication system of the called communication terminal 10 sounds. In steps S1118 and S1119, the called party performs the incoming call operation via the second wireless communication system, so that the second call is made between the calling communication terminal 20 and the called communication terminal 10. The connection is completed via the wireless communication system.

  With reference to FIG. 12, another example of a communication line connection procedure when communication is performed from the second communication terminal 20 to the first communication terminal 10 will be described. In this example, the calling communication terminal 20 is within the second wireless communication system and the called communication terminal 10 is within the first wireless communication system. It is out of range. This example is different from the example in FIG. 11 in that the called communication terminal 10 is outside the range of the second wireless communication system.

  Steps S1201 to S1213 are the same as S1101 to S1113 in FIG. Steps after step S1214 will be described.

  In step S1214, the called communication terminal 10 searches for the base station 203 (FIG. 1) of the second wireless communication system, but the called communication terminal 10 is out of range of the second wireless communication system. Therefore, even if a search is performed for a predetermined base station search time Ts, it cannot be detected. That is, it is not possible to connect to the second wireless communication system. In step S1215, the called communication terminal 10 determines that the second wireless communication system is out of service and turns off the second wireless communication system power supply 306 as it is. Here, in order to reduce the power consumption of the second wireless communication system of the called communication terminal 10 as much as possible, it is desirable to satisfy Ts ≦ Tw.

  In step S1216, the call control server of the second wireless communication system that has been in the position registration waiting state again sends the call registration side communication terminal 10 to the second wireless communication system. Request location registration confirmation. The request for confirmation of the location registration is made after a predetermined maximum waiting time Tw after making a call to the first wireless communication system in S1208. In step S1217, the location registration management server 202 determines that the IP address of the called communication terminal 10 is not registered, and notifies the call control server 201 that connection is not possible.

  Steps S1218 to S1221 are the same as steps S1022 to S1025 in FIG. That is, the call control server of the second wireless communication system makes a call to the called communication terminal 10 again via the first wireless communication system. The call here is a call that indicates an incoming call via the original first wireless communication system, and the number of calls is two or more.

  At this time, that is, from the second call onward, the incoming call sound of the first wireless communication system of the called communication terminal sounds. In steps S1222 to S1224, the called party performs an incoming call operation via the first wireless communication system, so that the first communication terminal 20 and the called communication terminal 10 receive the first call. The connection via the wireless communication system is completed.

  As described above, as in the second embodiment, even if the second wireless communication system power supply 306 of the called communication terminal 10 is always turned off and enters the standby state, the second wireless communication system Therefore, the power consumption during standby can be greatly reduced. In this embodiment, as in the first to fourth embodiments, one terminal has a telephone number of the first wireless communication system and a telephone number of the second wireless communication system separately. Instead, the telephone number of the first wireless communication system is also used in the second wireless communication system. Therefore, the system can be simplified.

It is a figure which shows the whole structure of the radio | wireless communications system by this invention. It is a figure which shows the cell range of the radio | wireless communications system by this invention. It is a block diagram which shows the internal structure of the communication terminal of the dual system by this invention. It is a figure which shows the 1st example of the communication connection method regarding the 1st Embodiment of this invention. It is a figure which shows the 2nd example of the communication connection method regarding the 1st Embodiment of this invention. It is a figure which shows the 1st example of the communication connection method regarding the 2nd Embodiment of this invention. It is a figure which shows the 2nd example of the communication connection method regarding the 2nd Embodiment of this invention. It is a figure which shows the example of the communication connection method regarding the 3rd Embodiment of this invention. It is a figure which shows the 1st example of the communication connection method regarding the 4th Embodiment of this invention. It is a figure which shows the 2nd example of the communication connection method regarding the 4th Embodiment of this invention. It is a figure which shows the 1st example of the communication connection method regarding the 5th Embodiment of this invention. It is a figure which shows the 2nd example of the communication connection method regarding the 5th Embodiment of this invention. It is a figure which shows an example of the flow of the call connection using SIP regarding a prior art example. It is a figure which shows the other example of the flow of the call connection using SIP regarding a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st (calling side) communication terminal (dual communication terminal), 11, 12 ... Antenna, 20 ... 2nd (calling side) communication terminal (communication terminal), 21 ... Antenna, 30 DESCRIPTION OF SYMBOLS ... Network connection part 31 ... Number comparison table database 100 ... 1st wireless communication system, 101 ... Call control server, 102 ... Location registration management server, 103 ... Base station, 104 ... Antenna, 200 ... 2nd wireless communication System 201: Call control server 202 ... Location registration management server 203 ... Base station 204 ... Antenna 301 ... Antenna (for the first wireless communication system) 302 ... Antenna (for the second wireless communication system), 303 ... 1st wireless communication system transmission / reception circuit, 304 ... 2nd wireless communication system transmission / reception circuit, 305 ... Power supply (for 1st wireless communication system), 306 ... Power supply (2nd wireless communication system) For Temu), 307 ... common circuit unit, 308 ... controller, 309 ... input section, 310 ... Output section

Claims (11)

A calling communication terminal capable of communicating via a wireless LAN communication system and a called communication terminal capable of communicating via both a wireless LAN communication system and a cellular mobile communication system via a network connection unit; In a communication system that performs communication connection between
A number comparison table database storing a correspondence relationship between a telephone number of a wireless LAN communication system of a communication terminal and a telephone number of a cellular mobile communication system;
When a call is made from the calling communication terminal to the called communication terminal via the wireless LAN communication system,
The network connection unit obtains a telephone number of the cellular mobile communication system of the called communication terminal from the number comparison table database, and calls the obtained telephone number via the cellular mobile communication system. Accordingly, the communication terminal on the called side is notified that there has been a call via the wireless LAN communication system, and the network connection unit connects the communication terminal on the called side via the wireless LAN communication system. A wireless communication system, characterized by asking whether to make a connection via the cellular mobile communication system or to disconnect the connection to the communication terminal on the calling side when there is a notification of failure. 2. The wireless communication system according to claim 1, wherein when the calling communication terminal selects connection via the cellular mobile communication system, the calling communication terminal passes through the wireless LAN communication system. A wireless communication system, wherein the called communication terminals communicate with each other via the cellular mobile communication system. A calling communication terminal capable of communicating via a wireless LAN communication system and a called communication terminal capable of communicating via both a wireless LAN communication system and a cellular mobile communication system via a network connection unit; In a communication system that performs communication connection between
A number comparison table database storing a correspondence relationship between a telephone number of a wireless LAN communication system of a communication terminal and a telephone number of a cellular mobile communication system;
When a call is made from the calling communication terminal to the called communication terminal via the wireless LAN communication system,
The network connection unit obtains a telephone number of the cellular mobile communication system of the called communication terminal from the number comparison table database, and calls the obtained telephone number via the cellular mobile communication system. Thus, the communication terminal on the called side is notified that there has been a call via the wireless LAN communication system, and the communication terminal on the called side can communicate via the wireless LAN communication system. Waiting, when the called communication terminal is able to communicate via the wireless LAN communication system, the calling communication terminal and the called communication terminal are connected via the wireless LAN communication system. , communicate with each other, to the communication terminal of the incoming call side, when notified that there was a call via the wireless LAN communication system, via said cellular mobile communication system Wireless communication system and notifying a different calling methods from the case of notifying that there was a call. 4. The wireless communication system according to claim 3, wherein upon receiving notification of an incoming call of the wireless LAN communication system via the cellular mobile communication system, the called communication terminal turns on the power supply for the wireless LAN communication system. A wireless communication system, wherein the wireless communication system is turned on and communicates with the calling communication terminal via the wireless LAN communication system. A calling communication terminal capable of communicating via a wireless LAN communication system and a called communication terminal capable of communicating via both a wireless LAN communication system and a cellular mobile communication system via a network connection unit; In a communication system that performs communication connection between
A number comparison table database storing a correspondence relationship between a telephone number of a wireless LAN communication system of a communication terminal and a telephone number of a cellular mobile communication system;
When a call is made from the calling communication terminal to the called communication terminal via the wireless LAN communication system,
The network connection unit obtains a telephone number of the cellular mobile communication system of the called communication terminal from the number comparison table database, and calls the obtained telephone number via the cellular mobile communication system. As a result, the called communication terminal is notified that there has been a call via the wireless LAN communication system, and even if a predetermined time is waited, the called communication terminal does not pass through the wireless LAN communication system. When communication is not possible, the calling communication terminal communicates with each other via the wireless LAN communication system, and the called communication terminal communicates with each other via the cellular mobile communication system. Wireless communication system. In a communication system for performing communication connection between communication terminals capable of communicating via both a wireless LAN communication system and a cellular mobile communication system via a network connection unit,
A number comparison table database storing a correspondence relationship between a telephone number of a wireless LAN communication system of a communication terminal and a telephone number of a cellular mobile communication system;
When a call is made from the calling communication terminal to the called communication terminal via the wireless LAN communication system,
The network connection unit obtains a telephone number of the cellular mobile communication system of the called communication terminal from the number comparison table database, and calls the obtained telephone number via the cellular mobile communication system. Accordingly, the communication terminal on the called side is notified that there has been a call via the wireless LAN communication system, and further, a processing method when communication cannot be established via the wireless LAN communication system, and the incoming call is notified. A wireless communication system characterized in that when a communication terminal on the side cannot connect via the wireless LAN communication system, processing is performed by a processing method specified by the communication terminal on the called side. 7. The wireless communication system according to claim 6, wherein when the calling communication terminal is unable to communicate via a wireless LAN communication system, the processing method is a connection via the cellular mobile communication system. A communication terminal turns off the power supply for the wireless LAN communication system and waits for a call from the calling communication terminal via the cellular mobile communication system. In a communication system for performing communication connection between communication terminals capable of communicating via both a wireless LAN communication system and a cellular mobile communication system via a network connection unit,
The communication terminal on the calling side has a number comparison table database that stores the correspondence between the telephone number of the wireless LAN communication system of the communication terminal and the telephone number of the cellular mobile communication system,
When a call is made from the calling communication terminal to the called communication terminal via the wireless LAN communication system,
The calling communication terminal obtains the telephone number of the cellular mobile communication system of the called communication terminal from the number comparison table database, and uses the obtained telephone number via the cellular mobile communication system. By making a call, the called communication terminal is notified that there has been a call via the wireless LAN communication system, and after the predetermined time has elapsed, the called communication terminal is notified of the wireless communication terminal. A wireless communication system, wherein a call is made via a LAN communication system. 9. The wireless communication system according to claim 8, wherein a connection is made via the wireless LAN communication system even if a call is made to the called communication terminal via the wireless LAN communication system after a predetermined time has elapsed. A communication terminal characterized by turning off the power supply for the wireless LAN communication system and trying to connect to the called communication terminal via the cellular mobile communication system when it cannot. A calling communication terminal capable of communicating via a wireless LAN communication system and a called communication terminal capable of communicating via both a wireless LAN communication system and a cellular mobile communication system via a network connection unit; In a communication system that performs communication connection between
When a call is made from the calling communication terminal to the called communication terminal via the wireless LAN communication system,
When the IP address of the called communication terminal is registered, the calling terminal and the called communication terminal are connected via the wireless LAN communication system. If the IP address of the called communication terminal is not registered, the wireless LAN is communicated to the called communication terminal by making a call through the cellular mobile communication system. Notifying that there was a call via the communication system, disconnecting the connection via the cellular mobile communication system to the callee communication terminal, and the callee communication terminal via the wireless LAN communication system Wait until communication is possible, and when the IP address of the called communication terminal is registered, the calling communication terminal and the called communication terminal are connected to the wireless LAN communication system. Wireless communication system, characterized in that at over, communicate with each other. 11. The wireless communication system according to claim 10, wherein communication cannot be made via the wireless LAN communication system even if the called communication terminal waits for a predetermined time, and the called communication terminal When an IP address is registered, the calling communication terminal communicates with each other via the wireless LAN communication system, and the called communication terminal communicates with each other via the cellular mobile communication system. Wireless communication system.

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