JP2005080199A - Radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption while waiting a call in a dual communication terminal. <P>SOLUTION: In the communication terminal connectable to a plurality of different radio communication systems, in a call waiting state, in power sources for the plurality of radio communication systems, only a power source for a first radio communication system is turned on and other power sources for the radio communication systems are turned off to receive a notice of call termination via the first radio communication system. When a call termination message via a second radio communication system is received via the first radio communication system, a power source for the second radio communication system is turned on. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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.

  Communication terminals that can use such a plurality of wireless communication services are widespread. In particular, dual-type communication terminals that support two communication methods are widespread. In communication terminals compatible with 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.

  For fixed telephone services, low-priced services using VoIP (Voice Over IP) technology have become widespread, and the sense of value of mobile phone systems has increased. 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. VoIP call control includes the H.323 method, the SIP (Session Initiation Protocol) method, and the SIP method will be described here. SIP is a protocol for handling the start, change, and end of multimedia sessions, and is defined in RFC3261 of IETF (Internet Engineering Task Force).

  With reference to FIG. 11, a procedure for call connection 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 the terminal A with the location server and transmits 200 OK to the 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 2000 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,
A telephone number message address comparison table database that stores the correspondence between the telephone number of the wireless communication system of the communication terminal and the message address 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,
The message address of the other wireless communication system of the called communication terminal is obtained from the telephone number message address comparison table database, and the received message address indicates that there has been an incoming call via the wireless communication system. By transmitting the incoming call notification message, the incoming call is notified to the incoming 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,
When connecting communication between communication terminals connectable to both the wireless communication system and the other wireless communication system,
The wireless communication system is connected from the calling communication terminal to the called communication terminal via the other wireless communication system and / or the calling wireless communication system and the called wireless communication system. An incoming call notification message indicating that there has been an incoming call is transmitted, and the communication terminal on the incoming call side waits for connection via the wireless communication system.

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

  According to the present invention, in a communication terminal connectable to a plurality of different wireless communication systems, when a call is made to a communication terminal connectable to the first and second wireless communication systems, the user When a call is made to the communication terminal from the telephone number of the second wireless communication system, the telephone number message address contrast storing the correspondence between the telephone number of the second wireless communication system and the message address of the first wireless communication system By retrieving a message address of the first wireless communication system corresponding to the telephone number that has been called from the table database, and sending an incoming call notification message to the message address of the first wireless communication system, the incoming call is received. The incoming call is notified to the communication terminal on the side.

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 telephone number message storing the correspondence between the telephone number of the communication terminal of the wireless communication system and the message address of the other wireless communication system An address comparison 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 message address of the other radio communication system of the called communication terminal from the telephone number message address comparison table database and transmitting the incoming call notification message to the obtained message address, the called party communication The terminal is notified of the incoming call.

  In a dual communication terminal, power consumption during standby can be greatly reduced. In particular, since 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, the power consumption is reduced to about 1/2 or less by eliminating this power consumption. be able to. Therefore, the standby time becomes about twice or more.

  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 telephone number message address comparison table database 31. The first communication terminal 10 is a called communication terminal, and the second and third communication terminals 20 and 20a are calling communication terminals. The called communication terminal 10 is a dual 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 second communication terminal 20 on the calling side has the antenna 21 for the second wireless communication system and is a communication terminal compatible with the second wireless communication system 200. The second communication terminal 20a on the calling side is a dual communication terminal having antennas 21a and 22a for the first and second wireless communication systems and corresponding to the two wireless communication systems 100 and 200. The telephone number message address comparison table database 31 records the correspondence between the telephone number and message address of the first wireless communication system of the called communication terminal 10 and the telephone number of the second wireless communication system.

  The first wireless communication system 100 includes a call control server 101, a location registration management server 102, a base station 103, and a base station 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 a base station 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 wireless 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 capable of realizing 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 telephone number message address comparison table database 31 is connected to the network connection unit 30, but the telephone number message address comparison table database 31 is provided at an arbitrary location. For example, the telephone number message address comparison table database 31 may be provided in the second wireless communication system 200 or may be provided in the communication terminal 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 base station 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 base station 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 constituent parts, the first wireless communication system and the second wireless communication system A common circuit unit 307 for performing common signal processing, a control unit 308 for turning on and off the power supply voltage of the two power sources 305 and 306, an input unit 309 such as keys and buttons, and an output unit 310 such as a display. Have

The communication terminal 10 of this example further includes a telephone number message address comparison table 311a for storing telephone numbers and message addresses of the first and second wireless communication systems, and a message transmission / reception unit 312. The message transmission / reception unit 312 is included in the control unit 308.
The configuration of the second communication terminal 20a 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. 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 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 telephone number message address comparison table database 31 to thereby establish the first wireless communication system of the called communication terminal 10. Get the message address. In step S409, the call control server 201 of the second wireless communication system transmits an incoming call notification message to the obtained message address of the first wireless communication system, thereby calling from the communication terminal 20 on the calling side. Notify the outgoing call. As a method for transmitting an incoming call notification message, a case where an electronic mail function is used will be described here. Specifically, the control unit 308 of the communication terminal 20 on the calling side creates an incoming call notification mail, and the message transmission / reception unit 312 transmits the incoming call notification mail. This incoming call notification message needs to be distinguished from ordinary e-mail.

  An example of an incoming call notification mail will be described with reference to FIG. 10A. The incoming call notification mail 400 in this example includes a destination 401, a carbon copy (cc: Carbon Copy) 402, a subject 403, and a text 404. As the destination 401, the mail address of the called communication terminal 10, for example, “dual_mode_b@wcdmaphone.co.jp” is used. For the carbon copy 402, the destination of simultaneous transmission, for example, the mail address “dual_mode_a@wcdmaphone.co.jp” of the communication terminal 20 on the calling side is used. The carbon copy 402 may be empty. For the subject 403, use a keyword 407 representing an incoming call to the second wireless communication system from the communication terminal 20 on the calling side that has been decided in advance as an incoming call notification mail, for example, “Call Notification”. Can do. The body text 404 includes the user ID 405 (Identification) of the called communication terminal 10 pre-registered in the call control server 104, for example, Dual_Mode_A, and the password 406 (PW: Pass Word), for example, “A1234567”. be able to. Other methods that can identify an incoming call notification mail, for example, a method in which the subject 403 is empty and a text 407 representing a predetermined incoming call notification mail is included in the text 404 can also be used. Further, the text 404 may be empty only by transmitting the keyword 407. Further, the subject 403 is empty, and the keyword 407, user ID 405, and password 406 can be transmitted as the text 404.

  Returning again to FIG. The called communication terminal 10 receives the incoming call notification message from the call control server 201 of the second wireless communication system via the message transmission / reception unit 312. The keyword 407 of the predetermined title is detected from the incoming call notification message, the user ID 405 and the password 406 are confirmed, and it is determined whether the incoming call request is from the communication terminal 20 on the outgoing call side.

  In step S410, if the called communication terminal 10 determines that the called notification message is an incoming call request from the calling communication terminal 10 via the second wireless communication system, the second wireless terminal 10 The communication system power supply 306 (FIG. 3) is turned on.

  In step S411, 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 S412, when the call control server 201 of the second wireless communication system transmits the incoming call notification message, the call control server 201 sends the incoming call communication terminal 10 to the location registration management server 202 of the second wireless communication system. Waiting for location registration.

  In step S413, 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 called communication terminal 10. Request confirmation of location registration. The confirmation request is again made after a predetermined maximum waiting time Tw after the incoming call notification mail in step S409 is transmitted. In addition, you may perform control which tries to confirm position registration several times during maximum waiting time Tw.

  In step S414, 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 S415, 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 S416 and S417, 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 occurs. The connection is completed via the communication system. After the connection is completed, the second wireless communication system power supply 306 (FIG. 3) is turned off, and the process returns to the initial state of step S403.

  If the location registration management server 202 determines in step S414 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. 5, 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. 4 in that the called communication terminal 10 is outside the range of the second wireless communication system.

  Steps S501 to S510 are the same as steps S401 to S410 in FIG. In the communication terminal 20 on the calling side, 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 radio communication system of the communication terminal 10 on the called side is off, and the power supply 305 for the first radio communication system is on.

  Steps S511 and after will be described. In step S 511, the called communication terminal 10 searches the base station 203 (FIG. 1) of the second wireless communication system and attempts location registration 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 S512, 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 S513, when the call control server 201 of the second wireless communication system transmits the incoming call notification message, the communication terminal 10 of the called side transmits the incoming call notification message to the location registration management server 202 of the second wireless communication system. Waiting for location registration.

  In step S514, the call control server 201 of the second wireless communication system that has been waiting for location registration is sent to the location registration management server 202 again to the second wireless communication system of the called communication terminal 10. 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 S515, 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 step S516, 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 it is not registered, and requesting selection of whether to disconnect as it is or to connect with the first wireless communication system.

  In step S517, the calling communication terminal 20 selects connection in the first wireless communication system. In step S518, the calling communication terminal 20 notifies the call control server 201 of the second radio communication system that the first radio communication system is connected. In step S519, 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 S520, the call control server 101 of the first wireless communication system notifies the called communication terminal 10 that the calling communication terminal 20 is connected in the first wireless communication system. At this time, the incoming call sound of the first wireless communication system of the called communication terminal 10 sounds. In steps S521 to S523, 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 is completed via the wireless communication system.

  In step S517, 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 S517, 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 to disconnect. 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.

[Second Embodiment]
With reference to FIG. 6, a communication line connection procedure when communication is performed from the second communication terminal 20a to the first communication terminal 10 will be described. In this example, both the calling side and called side communication terminals 20a and 10 have a function of performing communication via the first and second wireless communication systems. In other words, both the calling and called communication terminals 20a and 10 are dual communication terminals. The calling communication terminal 20a 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 calling communication terminal 20a further includes a telephone number message address comparison table 311a for storing telephone numbers and message addresses of the first wireless communication system.

  In step S701, as an initial state, the power supply for the second wireless communication system of the calling communication terminal 20a is off and the power supply for the first wireless communication system is on. Since the communication terminal 20a on the calling side 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 S702. When the location registration is completed, the calling communication terminal 20a 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 S703, 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 S704. 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 20a. At this time, the communication terminal 20a on the calling side performs the following operation.

  In step S705, the power supply 306 (FIG. 3) for the second wireless communication system of the calling communication terminal 20a is turned on automatically or manually by a caller's call operation. In step S706, the calling communication terminal 20a performs location registration with the location registration management server 202 of the second wireless communication system.

  In step S707, the communication terminal 20a on the calling side operates as the first wireless communication system in accordance with the first wireless communication of the communication terminal 10 on the called side from the built-in telephone number message address comparison table 311a. The system mail address 408 (FIG. 10) is acquired. Specifically, the control unit 308 reads the mail address 408 of the first wireless communication system corresponding to the telephone number of the second wireless communication system of the called communication terminal 10 from the telephone number message address comparison table 311a. .

  In step S708, the calling communication terminal 20a notifies the called communication terminal 10 of the incoming call notification mail via the first wireless communication system, as in the first embodiment. 400 is transmitted. In step S706, the communication terminal 20a on the calling side completes the location registration with the location registration management server 202 of the second wireless communication system, and therefore receives the incoming call notification mail 400 via the second wireless communication system. You may send it.

  In step S709, the incoming communication terminal 10 receives the incoming call notification message from the outgoing communication terminal 20a via the second wireless communication system. Is determined, the second wireless communication system power supply 306 (FIG. 3) is turned on.

  In step S710, since the called communication terminal 10 is within the range of the second radio communication system, the location registration is performed with the location registration management server 202 of the second radio 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 S711, when the calling communication terminal 20a transmits the incoming call notification message, the call waiting communication terminal 10 waits for the location registration from the called communication terminal 10 to the location registration management server 202 of the second wireless communication system. It becomes.

  In step S712, the calling communication terminal 20a 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 transmitting the incoming call notification message in step S708. In addition, you may perform control which tries to confirm position registration several times during maximum waiting time Tw.

  In step S713, 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 S714, 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 S715, 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 S716 and S717, the called party performs an incoming call operation via the second wireless communication system, so that the second wireless communication is established between the calling communication terminal 20a and the called communication terminal 10. The connection is completed via the communication system. After the connection is completed, the second wireless communication system power supply 306 (FIG. 3) is turned off, and the process returns to the initial state of step S703.

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

  Steps S801 to S809 are the same as steps S701 to S709 in FIG. Here, step S810 and subsequent steps will be described. In step S810, the called communication terminal 10 searches for 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 S811 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 S812, when the calling communication terminal 20a transmits an incoming call notification message, the calling communication terminal 20a performs location registration from the called communication terminal 10 to the location registration management server 202 of the second wireless communication system. It will be in a waiting state.

  In step S813, the calling communication terminal 20a calls the telephone number of the second wireless communication system of the called communication terminal 10. In step S814, the call control server 201 of the second wireless communication system requests the location registration management server 202 to confirm whether or not the location registration of the communication terminal 10 on the called side has been performed. In step S815, the location registration management server 202 determines that the location registration of the communication terminal 10 on the called side is not performed, and notifies the call control server 201 that connection is not possible. In step S816, the calling communication terminal 20a determines that the called communication terminal 10 is out of the range of the second wireless communication system, and disconnects the connection via the second wireless communication system.

  In step S817, the communication terminal 20a on the calling side operates as the first wireless communication system in accordance with the first wireless communication of the communication terminal 10 on the called side from the built-in telephone number message address comparison table 311a. Get the system phone number. Specifically, the control unit 308 reads the telephone number from the telephone number message address comparison table 311a.

  In steps S818 to S821, the calling communication terminal 20a calls the number of the first wireless communication system of the called communication terminal 10. In step S821, the incoming call sound of communication terminal 10 on the called side sounds. In steps S822 and S823, the callee performs an incoming call operation via the first wireless communication system, so that the first caller communication terminal 20a and the callee communication terminal 10 receive a first call. The connection via the wireless communication system is completed.

  In this example, in steps S817 to S821, the communication terminal on the calling side automatically connects via the first wireless communication system. However, the caller may be configured to manually select a connection via the first wireless communication system. In addition, a call may be made to the number of the first radio communication system of the called communication terminal using the second radio communication system without making a call via the first radio communication system. .

  In the second embodiment, the communication terminal on the calling side is 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 second 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.

[Third embodiment]
With reference to FIG. 8, a communication line connection procedure when communication is performed from the second communication terminal 20a to the first communication terminal 10 will be described. In this example, both the calling side and called side communication terminals 20a and 10 have a function of performing communication via the first and second wireless communication systems. In other words, both the calling and called communication terminals 20a and 10 are dual communication terminals. The calling communication terminal 20a 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 calling communication terminal 20a further includes a telephone number message address comparison table 311a for storing telephone numbers and message addresses of the first and second wireless communication systems.

  Steps S901 to S911 are the same as steps S701 to S711 in FIG. Here, step S912 and after will be described. In step S912, the called communication terminal 10 sends a standby notification message for notifying completion of location registration of the second wireless communication system via the first wireless communication system to the calling communication terminal. To 20a. As a method for transmitting a standby notification message, a case where an electronic mail function is used will be described here. Specifically, the control unit 308 of the calling communication terminal 20a creates a standby notification mail, and the message transmission / reception unit 312 transmits the standby notification mail. In step S910, the communication terminal 10 on the called side has completed the location registration to the location registration management server 202 of the second wireless communication system, so that a standby notification message is sent via the second wireless communication system. You may send it.

  An example of the standby notification mail will be described with reference to FIG. 10B. The standby notification mail 500 of this example may have the same format as the incoming call notification mail 400 shown in FIG. 10A, but the subject 503 includes a keyword 507 indicating a standby state from the communication terminal 10 on the incoming call side that has been decided in advance. For example, “Idle Notification” can be used. In the body 504, the user ID 505 (Identification) of the called communication terminal 10, for example, Dual_Mode_B, and the password 506 (PW: Pass Word), for example, “B1234567” can be used.

  Returning again to FIG. Steps S913 to S918 are the same as steps S712 to S717 in FIG.

  With reference to FIG. 9, a communication line connection procedure when communication is performed from the second communication terminal 20a to the first communication terminal 10 will be described. In this example, the calling communication terminal 20a 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. 8 in that the called communication terminal 10 is outside the range of the second wireless communication system.

  Steps S1001 to S1012 are the same as steps S801 to S812 in FIG. Here, step S1013 and subsequent steps will be described. In step S1013, the called communication terminal 10 sends a call waiting notification message for notifying the location registration failure of the second wireless communication system via the first wireless communication system. It transmits to the terminal 20a. As a method for transmitting the standby-impossible notification message, a case where an electronic mail function is used will be described here. In detail, the control unit 308 of the communication terminal 10 on the called side creates a standby notifying notification mail, and the message transmitting / receiving unit 312 transmits a standby impossible notification mail.

  With reference to FIG. 10C, an example of a standby failure notification mail will be described. The standby notification message of this example may be a standby disabled mail 600 in the same format as the incoming call notification mail 400 shown in FIG. 10A, but the subject 603 includes a predetermined communication terminal 10 from the incoming call side. The keyword 607 indicating the standby disabled state, for example, “Idle NG Notification” can be used. In the body 604, the user ID 605 (Identification) of the called communication terminal 10, for example, Dual_Mode_B, and the password 606 (PW: Pass Word), for example, “B1234567” can be used.

  Returning again to FIG. Steps S1014 to S1020 are the same as steps S817 to S823 in FIG. After the call is finished, the power supply for the second wireless communication system of the communication terminal 20a on the calling side is turned off, and the process returns to the initial state (S1001).

  In this example, in steps S1014 to S1020, 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. In addition, a call may be made to the number of the first radio communication system of the called communication terminal using the second radio communication system without making a call via the first radio communication system. .

  In the third embodiment, the incoming call notification mail 400 is transmitted using the first wireless communication system of the calling communication terminal. However, the second wireless communication system may be used. Although the standby notification mail 500 and the standby failure notification mail 600 are received using the first wireless communication system of the calling communication terminal, the second wireless communication system may be used. Similarly, the standby notification mail 500 is transmitted using the first wireless communication system of the called communication terminal, but the second wireless communication system may be used.

  In the third embodiment, the dual terminal capable of communicating with both the first and second wireless communication systems is taken as an example of the calling terminal. However, as described in the first embodiment, mail, short A terminal for a wireless LAN communication system, a W-CDMA communication system, a PHS system, or a fixed telephone system capable of transmitting and receiving messages such as messages may be used.

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 3rd Embodiment of this invention. It is a figure which shows the example of an incoming call notification mail, a standby notification mail, and a standby impossible notification mail. 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, 11, 12 ... Antenna, 20, 20a ... 2nd (calling side) communication terminal, 21 ... Antenna, 30 ... Network connection part, 31 ... Telephone number Message address comparison table database, 100 ... first wireless communication system, 101 ... call control server, 102 ... location registration management server, 103 ... base station, 104 ... antenna, 200 ... second 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 ... First Wireless communication system transmission / reception circuit, 304 ... second wireless communication system transmission / reception circuit, 305 ... power supply (for the first wireless communication system), 306 ... power supply (second For line communication system), 307 ... common circuit unit, 308 ... controller, 309 ... input section, 310 ... Output section

Claims (21)

In a wireless communication system connectable to a wireless communication system of another different communication method via a network connection unit,
A telephone number message address comparison table database that stores the correspondence between the telephone number of the wireless communication system of the communication terminal and the message address 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,
The message address of the other wireless communication system of the called communication terminal is obtained from the telephone number message address comparison table database, and the received message address indicates that there has been an incoming call via the wireless communication system. A wireless communication system, wherein an incoming call is notified to a communication terminal on a called side by transmitting an incoming call notification message.   2. The wireless communication system according to claim 1, wherein after the incoming call notification message is transmitted to the called communication terminal via the other wireless communication system, the received wireless communication system from the called communication terminal. A wireless communication system, characterized in that a call-side communication terminal and a call-side communication terminal are connected via the wireless communication system when there is a notification of connection via.   2. The wireless communication system according to claim 1, wherein, after a call notification message is transmitted to the communication terminal on the called side via the other wireless communication system, the communication on the called side is performed even if a predetermined time elapses. A wireless communication system, characterized in that when a connection from a terminal is not made via the wireless communication system, the caller side communication terminal is asked whether to connect via the other wireless communication system or to disconnect the connection. .   2. The wireless communication system according to claim 1, wherein, after a call notification message is transmitted to the communication terminal on the called side via the other wireless communication system, the communication on the called side is performed even if a predetermined time elapses. A wireless communication system, wherein, when a connection from a terminal via the wireless communication system is not made, the communication terminal is automatically connected to the calling communication terminal via the other wireless communication system. In a wireless communication system connectable to a wireless communication system of another different communication method via a network connection unit,
When connecting communication between communication terminals connectable to both the wireless communication system and the other wireless communication system,
The wireless communication system is connected from the calling communication terminal to the called communication terminal via the other wireless communication system and / or the calling wireless communication system and the called wireless communication system. A wireless communication system, characterized in that an incoming call notification message indicating that an incoming call has been received via a wireless communication terminal is transmitted and a connection via the wireless communication system is awaited from a communication terminal on the incoming call side.   6. The wireless communication system according to claim 5, wherein the call receiving side communication terminal is connected to the call receiving side communication terminal via the other radio communication system and / or the call side radio communication system. After the call notification message is transmitted, when a connection is not established from the called communication terminal via the wireless communication system, the calling communication terminal communicates with the called communication terminal via the wireless communication system. A wireless communication system comprising: disconnecting a connection with a terminal and connecting between the calling communication terminal and the called communication terminal via the other wireless communication system.   6. The wireless communication system according to claim 5, wherein the call receiving side communication terminal is connected to the call receiving side communication terminal via the other radio communication system and / or the call side radio communication system. After sending a call notification message, an incoming call can be made from the called communication terminal to the calling communication terminal via the wireless communication system via the wireless communication system and / or another wireless communication system. A wireless communication system comprising: connecting the calling communication terminal and the called communication terminal via the wireless communication system when a standby notification message indicating that the call is received is transmitted.   6. The wireless communication system according to claim 5, wherein the call receiving side communication terminal is connected to the call receiving side communication terminal via the other radio communication system and / or the call side radio communication system. After sending the call notification message, the standby communication notification that the incoming call via the wireless communication system is impossible from the incoming communication terminal to the outgoing communication terminal via another wireless communication system A wireless communication system, wherein when a message is transmitted, the calling communication terminal and the called communication terminal are connected via the other wireless communication system.   In a communication terminal that can be connected to a plurality of different wireless communication systems, in a standby state, only the first wireless communication system power supply among the plurality of wireless communication system power supplies is turned on, and for other wireless communication systems A communication terminal characterized in that all power is turned off and an incoming call notification message is received through the first wireless communication system.   10. The communication terminal according to claim 9, wherein when the incoming call notification message notifies that the calling communication terminal has made a call via the second wireless communication system, the power supply for the second wireless communication system is turned on. A communication terminal which is turned on and performs communication via a second wireless communication system.   10. The communication terminal according to claim 9, wherein when the incoming call notification message notifies that the calling communication terminal has made a call via the second wireless communication system, the power supply for the second wireless communication system is turned on. A communication terminal that is turned on and transmits a standby notification message to a communication terminal on a calling side.   10. The communication terminal according to claim 9, wherein the incoming call notification message notifies that the calling communication terminal has made a call via the second wireless communication system, and the second wireless communication system can be used. A communication terminal characterized by turning off the power supply for the second wireless communication system and waiting for an incoming call through the first wireless communication system when it cannot.   10. The communication terminal according to claim 9, wherein the incoming call notification message notifies that the calling communication terminal has made a call via the second wireless communication system, and the second wireless communication system can be used. A communication terminal characterized by transmitting a stand-by not ready notification message to a communication terminal on a calling side when it cannot.   In a communication terminal connectable to a plurality of different wireless communication systems, when a call is made to a communication terminal connectable to the first and second wireless communication systems, the user makes a call to the called communication terminal When a call is made from the telephone number of the second wireless communication system, the telephone number message address comparison table database storing the correspondence between the telephone number of the second wireless communication system and the message address of the first wireless communication system is used. The message address of the first wireless communication system corresponding to the calling telephone number is retrieved, and an incoming call notification message is transmitted to the message address of the first wireless communication system, so that the called communication terminal A communication terminal that notifies an incoming call.   15. The communication terminal according to claim 14, wherein a power supply for the second wireless communication system is turned on after transmitting an incoming call notification message to the called communication terminal, and the second wireless communication system is turned on from the called communication terminal. A communication terminal characterized by waiting for connection via a communication system.   15. The communication terminal according to claim 14, wherein after the incoming call notification message is transmitted to the incoming call side communication terminal, the power supply for the second wireless communication system is turned on, and the standby notification message is sent from the incoming call side communication terminal. A communication terminal characterized by performing connection via a second wireless communication system upon reception.   15. The communication terminal according to claim 14, wherein the second wireless communication system power is turned on after transmitting the incoming call notification message to the incoming call side communication terminal, and the incoming call side communication is performed even if a predetermined time has elapsed. When the terminal is not connected via the second wireless communication system, the power supply for the second wireless communication system is turned off, and the callee communication terminal is connected via the first wireless communication system. A communication terminal characterized by trying to connect.   15. The communication terminal according to claim 14, wherein after the incoming call notification message is transmitted to the incoming call side communication terminal, the power supply for the second wireless communication system is turned on, and the standby communication notification message is received from the incoming call side communication terminal. A communication terminal that performs connection via the first wireless communication system.   The communication terminal according to claim 14, wherein the telephone number message address comparison table database is provided in a server of the second wireless communication system or the communication terminal itself. 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 telephone number message storing the correspondence between the telephone number of the communication terminal of the wireless communication system and the message address of the other wireless communication system An address comparison 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 message address of the other radio communication system of the called communication terminal from the telephone number message address comparison table database and transmitting the incoming call notification message to the obtained message address, the called party communication A wireless communication system, wherein an incoming call is notified to a terminal.   21. The wireless communication system according to claim 20, wherein when the location registration server confirms that the location of the called communication terminal is registered, the call control server communicates with the calling side via the wireless communication system. A wireless communication system characterized in that a connection is made between a terminal and an incoming communication terminal.

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