JP2006042228A - Home terminal and incoming call transfer service system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transfer an incoming call according to location information of a registered terminal, with respect to a home terminal including a home agent function and an incoming call service system. <P>SOLUTION: A home terminal 10 comprises: a location management function unit 13 for managing location information of a terminal; a home agent function unit 11 for performing communication between an subordinate IP telephone terminal 2 and another telephone set 5, encapsulating an incoming IP packet from the other telephone set 5 to transfer to the IP telephone set using a header including a c/o address according to the location information of the terminal managed by the location management function unit 13, decapsulating the encapsulated IP packet from the terminal and transmitting the IP packet to the other telephone set 5; and a foreign agent function unit 12 for requesting the location registration of a terminal subordinate to another home terminal. This home terminal 10 is connected to the Internet, so that an incoming call can be transferred to a desired terminal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a home terminal having a home agent function for providing an IP (Internet Protocol) telephone service and a call transfer service system using the home terminal.

  The IP phone service performs connection start control with a communication partner via a device such as a SIP (Session Initiation Protocol) server for IP phone connection provided by an Internet provider, and a session is established by a communication partner response. The telephone conversation is performed by transmitting and receiving voice data using IP packets via the Internet. In that case, a configuration in which a general telephone is connected to a dedicated terminal device connected to the Internet and used as an IP telephone is used. In a mobile IP environment, an IP packet from a communication partner terminal is encapsulated with an IP header including a care-of address assigned to the mobile terminal at the destination of the mobile terminal and a source home address. A router (home terminal) having a home agent function for transferring to a mobile terminal is also known.

  Also, a service providing apparatus corresponding to the service type for providing various services such as a call receiving service during a call is provided, and a desired service is provided by a connection instruction from a connection server such as a SIP server according to the service request type from the IP telephone. A system for providing various services by connecting IP telephones to a providing apparatus has been proposed (for example, see Patent Document 1).

The multimedia communication system further includes a CTI (Computer Telephony Integration) server that holds routing data including a destination of a call from an external terminal, and a transfer server. The transfer server is a transfer destination list of a client terminal. There is also known a service in which a CTI server transfers data to a client terminal based on a transfer destination list without responding to an incoming call (for example, see Patent Document 2).
JP 2000-151679 A JP 2002-281159 A

  The IP telephone service calls a communication partner via an Internet device such as a SIP server at the start of communication, and responds to the call by the communication partner, whereby voice data is transmitted between the communication request source and the communication partner. Calls are transferred by IP packets. Therefore, as shown in the above-mentioned Patent Document 1, when the service request type is an incoming call transfer request, the incoming call transfer service responds by providing an incoming call transfer service providing apparatus. However, an extra device must be additionally installed with respect to the current system configuration, and there is a problem that the cost increases.

  Also, as shown in the above-mentioned Patent Document 2, the configuration in which the transfer destination is registered in the CTI server is difficult to apply to a mobile terminal whose transfer destination is changed. In addition, it is conceivable to provide a call transfer service by registering a transfer destination or the like in advance with an Internet provider, but there is a problem that an input operation via the Internet such as transfer destination registration is required. In the mobile IP phone service, it is possible to transmit to the mobile terminal by using the care-of address of the destination. For example, a call forwarding service to the destination terminal is provided together with the IP phone under the home agent. Is not.

  It is an object of the present invention to provide a home terminal that can easily provide a call transfer service and to provide a call transfer service for a destination IP telephone.

  The home terminal of the present invention is a home terminal having a home agent function in Internet communication, a location management function unit for managing location information of the terminal, and communication processing between a subordinate IP phone and another phone And an incoming IP packet from the other telephone to the IP telephone is encapsulated by a header including a care-of address according to the location information of the terminal managed by the location management function unit and transferred, and the capsule from the terminal A home agent function unit that decapsulates the IP packet that has been generated and transmits the packet to the other telephone, and determines whether or not a location registration request of a terminal under another home terminal is possible. A format is transmitted to the registration requesting terminal, and the location information of the terminal is registered in the location management function unit. And a down agent function unit.

  The home agent function unit of the home terminal causes the IP phone to receive incoming calls from the other telephones, and forwards them to all terminals registered with the location information in the location management function unit. It is possible to have a configuration for executing a connection process with the other telephone in response to the response.

  The location management function unit of the home terminal has a configuration for managing location information according to the location registration request from the terminal according to the order of distance from the home terminal, and the home agent function unit includes: A configuration may be adopted in which incoming calls from the other telephones are sequentially transferred according to the order in which the distances of the terminals managed by the location management function unit are short.

  The call transfer service system according to the present invention is a call transfer service system for transferring incoming calls from other telephones to an IP telephone, and a location management function unit for managing the location information of a terminal that permits call transfer; Encapsulate communication processing between a telephone and the other telephone and an incoming IP packet from the other telephone with a header including a care-of address according to the location information of the terminal managed by the location management function unit A home agent function unit that performs transfer processing, decapsulates the encapsulated IP packet from the terminal and transfers the packet to the other telephone, and determines whether or not a location registration request from a terminal under another home terminal is possible, A foreign agent function unit for registering location information in the location management function unit when possible, and the other telephone set. The home terminal to transfer incoming et to the IP telephone and the terminal has a configuration connected to the Internet.

  Further, the home agent function unit and the foreign agent function unit determine whether or not the location registration request from the terminal is acceptable, and only when it is possible, the location management function unit stores the location information of the terminal. The home agent function unit forwards incoming calls from the other telephones in order from the terminal with the shortest distance in the location information of the terminal. Can have a configuration.

  With a home terminal having a home agent function in mobile IP, an incoming call to an IP telephone under the home terminal can be transferred to a predetermined terminal without requiring processing for requesting an Internet provider. In this case, the location information of the terminal can be registered and managed in accordance with a registration request from the destination, so that the IP phone and a single or a plurality of terminals registered and managed by the location management function unit can be simultaneously registered. Alternatively, incoming calls can be transferred in the order of short distance.

  The home terminal and call transfer service system of the present invention will be described with reference to FIG. 2. Communication between the location management function unit 13 that manages the location information of the terminal and the subordinate IP telephone 2 and other telephones 5 will be described. Processing and transfer processing by encapsulating an incoming IP packet from another telephone 5 to the IP telephone 2 with a header including a care-of address according to the location information of the terminal managed by the location management function unit 13 as the location information D5. The home agent function unit 11 that decapsulates the encapsulated IP packet from the mobile phone 5 and performs transmission processing to the other telephone 5 and the location registration request of the terminals under the other home terminal are determined. Foreign agent that transmits a registration response to the location registration requesting terminal and registers the location information of the terminal in the location management function unit 13 A home terminal 10 having a capacity section 12, the home terminal 10 connected to the Internet, to call forwarding to a desired terminal.

  FIG. 1 is an explanatory diagram of a main part of a system according to a first embodiment of the present invention, in which 1-1 and 1-2 are home terminals, 2 is an IP telephone under the home terminal 1-1, and 3 and 4 are home terminals 1. -1 is a terminal that has moved from subordinates, 5 is a general telephone or another telephone such as an IP telephone, 6 is the Internet, and 7 is a base station. Home terminals 1-1 and 1-2 are installed in each user's home and connected to the Internet 6 to configure an incoming call transfer service system. A home telephone set is connected to the home terminals 1-1 and 1-2 as an IP telephone set 2 to constitute a call transfer service system. The IP telephone connected to the home terminal 1-2 is not shown. The home terminals 1-1 and 1-2 have a configuration including a home agent function unit, a foreign agent function unit, and a location management function unit, and are connected to the Internet 6 and omitted from the illustration. An IP telephone service is provided via a server, a router, or the like. Arrows a to e indicate routes for incoming calls and responses.

  That is, a call is made from the external telephone 5 to the IP telephone 2 subordinate to the home terminal 1-1 (in this case, a device for setting a call such as a SIP server is not shown as being included in the Internet 6). When the user of the IP telephone 2 responds, a normal call can be performed between the telephone 5 and the IP telephone 2 by transmitting and receiving IP packets via the Internet 6. When the terminal 3 is carried and moved under the control of the home terminal 1-2, the location registration request b is sent from the terminal 3 to the home terminal 1-1 via the home terminal 1-2. In this case, communication processing is performed between the foreign agent function unit of the home terminal 1-1 and the foreign agent function unit of the home terminal 1-2.

  In response to this location registration request b, the location registration response b is sent from the home terminal 1-1 to the terminal 3 via the home terminal 1-2. Thereby, the home terminal 1-1 registers and manages the location of the moved terminal 3 and further the distance from the home terminal 1-1 by the location management function unit. The foreign agent function unit of the home terminal 1-2 registers and manages the address information and the like of the terminal 3. Accordingly, at the time of incoming call from the telephone 5, the home terminal 1-1 makes no answer by the IP telephone 2 for a predetermined time, or when it is in an absent state by pressing the incoming call transfer setting key, or simultaneous incoming call transfer. With this setting, the address of the home terminal 1-2 is encapsulated as a destination address and transferred to the destination terminal 3. That is, the home terminal 1-1 can provide a call transfer service by managing the location of the terminal 3.

  When the user of the home terminal 1-1 carries the terminal 4 and moves to the service area of the base station 7, the mobile IP network registers the home address and the care-of address in the router of the Internet 6 through the base station 7. The terminal 4 makes a location registration request d of the terminal 4 to the home terminal 1-1 and sends a location registration response d from the home terminal 1-1 to the terminal 4. The location management function unit manages the location based on the care-of address of the destination of the terminal 4 and the distance from the home terminal 1-1, and forwards the incoming call from the telephone 5 to the terminal 4. it can. That is, the call transfer service can be provided by the functions of the home terminals 1-1 and 1-2 installed in the user's house without requesting and registering the call transfer destination from the Internet provider side.

  In addition, the location information of a plurality of terminals moved from the subordinates of the home terminals can be registered in the location management function units of the home terminals 1-1 and 1-2 for the registration-permitted terminals according to the location registration request. As a result, the incoming call from the telephone 5 can be transferred simultaneously with the IP telephone 2 to the registered terminals 3 and 4. In this case, a call is made with the IP telephone or terminal that has responded first and the telephone 5 that has made the call. Also, by registering the distance from the home terminal together with the location information, incoming calls can be transferred in the order from the home terminal 1-1, and if no response is made, the incoming calls can be transferred to the next closest terminal.

  The foreign agent function unit of the home terminals 1-1 and 1-2 is an acceptable terminal by transmitting and receiving a location registration request and a location registration response with another home terminal or a terminal under the home terminal. Only for the above, location registration is performed in the location management function unit to ensure reliability.

  FIG. 2 is an explanatory diagram of a home terminal according to an embodiment of the present invention, showing the main part of the configuration of the home terminals 1-1 and 1-2 in FIG. 1, wherein 10 is a home terminal, and 11 is a home. An agent function unit, 12 is a foreign agent function unit, 13 is a location management function unit, 14, 15 and 16 are databases, and 17 is a terminal display. The transmission / reception interface function unit is not shown, but can be realized by a known configuration. Corresponding parts are indicated by the same reference numerals as those shown in FIG. 1, and 8 indicates terminals belonging to other home terminals. In addition, the database 14 is referred to by data writing or reading by the home agent function unit 11, and MN (Mobile Node) management information D1 for HA (Home Agent), BC (Binding Cache) management for HA. Information including information D2 and BC BC call transfer information D6 is stored. The database 15 is written and read by the location management function unit 13, and stores location information D5 related to the location of the terminal movement destination. The database 16 is written and read by the foreign agent function unit 12, and stores FA (Foreign Agent) MN management information D3 and FA BC management information D4.

  An arrow indicates a flow of information, a1 is VoIP incoming from the telephone 5, a2 is VoIP incoming to the IP telephone 2, a3 is VoIP incoming to the terminal or another home terminal 1-2, and a4 is an IP telephone. 2, a5 is an encapsulated VoIP incoming response, a6 is a VoIP incoming response to the telephone 5, b1 is a location registration from a terminal or another home terminal 1-2, b2 is located from the home agent function unit 11 Location information registration to the management function unit 13, b3 is a location registration response to the terminal or another home terminal 1-2, c1 is a location information acquisition request from the home agent function unit 11 to the location management function unit 13, and c2 is a location management function unit 13 shows the location information acquisition response to the home agent function unit 11 .

  D1 indicates a location registration from the terminal 8 belonging to another home terminal, and d2 indicates a location registration response to the location registration. Further, e1 indicates a location information acquisition request from the foreign agent function unit 12 to the location management function unit 13, and e2 indicates a location information acquisition response thereto. Further, f1 indicates a location information display notification from the location management function unit 13 to the terminal display 17. G1 indicates a location information acquisition request from the terminal or location display device 3 to the location management function unit 13, and g2 indicates a location information acquisition response. The home agent function unit 11, the foreign agent function unit 12, and the location management function unit 13 can be realized by a processing function of a processor, and the databases 14 to 16 are stored in one memory area. It can also be realized by assignment.

  FIG. 3 shows (A) HA MN (home agent mobile terminal) management information D1 and (B) HA BC (home agent binding cache) management information D2 stored in the database 14 of the home terminal 10 described above. And (C) HA BC (home agent binding cache) incoming transfer information D6, the HA MN management information D1 in FIG. 3A includes allowed MN IP address 1 to allowed MN IP address. As indicated by N, the IP address of the terminal that is allowed to connect is registered in advance in the home terminal 10. Also, the HA BC management information D2 in FIG. 3B is mobile IP related information of a terminal whose location is registered as a home network with respect to the home terminal 10, as shown as BC management information 1 to BC management information N. MNHoA (mobile terminal home address), MNCoA (mobile terminal care-of address), and MNHA (home agent) address. Also, the HA call transfer information D6 in FIG. 3C includes a call transfer flag indicating whether or not the call transfer is performed in correspondence with the IP telephone address, and a call transfer indicating whether or not the call is being transferred. And a flag.

  FIG. 4 shows (A) FA MN (Foreign Agent Mobile Terminal) management information D3 and (B) FA BC (Foreign Agent Binding Cache) management information D4 stored in the database 16 of the home terminal 10. 4A, the MN management information D3 for FA in FIG. 4A registers the IP address of a terminal that can be connected as a foreign network to the home terminal, as shown as allowed MN IP address 1 to allowed MN IP address N. It is a thing. In addition, as shown in BC management information 1 to BC management information N, FA BC management information D4 in FIG. 4B is a mobile IP related information MNHoA (mobile information) of a terminal registered as a foreign network in the home terminal. It includes a terminal home address), an MNCoA (mobile terminal care-of address), an MNHA (mobile terminal home agent) address, and information indicating whether a BC (Binding Cache) is active.

  FIG. 5 shows an example of the location information D5 stored in the database 15 of the home terminal 10, and shows a case in which the distance from the home terminal HT is obtained and arranged in order of increasing distance. (A) of FIG. 5 shows the case of having items of point information (HT, FA, terminal), address (HA address, CoA, etc.), GPS information, place name, distance from HT, and next information. The position information about the foreign agent FA and the terminal such as the mobile phone is obtained from the care-of address CoA or the like or from the GPS information. The position information can be obtained from the position information, and from the home terminal HT. Can be obtained. And it arranges in order with a near distance corresponding to point information correspondence. The next information indicates the next address in the arrangement order.

  FIG. 5B shows care-of information, and includes terminal information (number, terminal name), CoA, place name, distance from HT, update date / time, and next information items, so that the destination of the terminal can be identified. The place name and the distance from the home terminal HT can be obtained based on the care-of address CoA. The next transfer destination can be obtained from the next information by arranging in order of the distance in correspondence with the care information. When a plurality of incoming call forwarding destinations are registered, the transfer process is performed on the terminal closest to the home terminal HT, and in the case of transfer failure, the transfer process can be performed on the next ranked terminal. Therefore, the distance from the home terminal HT is not required to be accurate, and can be classified based on, for example, a large, medium, and small relationship.

  FIG. 6 is an explanatory diagram of the incoming call transfer process, including the function unit 20 including the home agent function unit 11, the foreign agent function unit 12, and the location management function unit 13 shown in FIG. 2, and the functions of the databases 14 to 16. The home terminal 10 having processing functions and information storage means of the location management unit 21, BC (binding cache) management unit 22, and MN (mobile terminal) management unit 23, and outside the home network to which the home terminal 10 belongs The call transfer process when the IP telephone 25 and the terminals 26 and 27 exist is shown. S11 to S17 indicate the order of the process steps. The IP address of the IP telephone 24 is ADDR1, the IP address of the IP telephone 25 is ADDR4, the home address HoA of the terminal 26 is HoA1, the care-of address CoA is ADDR2, the home address HoA of the terminal 27 is HoA2, and the care-of address CoA is ADDR3. Show the case.

  When the terminals 26 and 27 move from the home network to the outside, ADDR1 is assigned as the care-of address CoA to the terminal 26, and ADDR2 is assigned to the terminal 27 as the care-of address CoA. , 27 (step S11). The function unit 20 registers the location management unit 21 and the BC management unit 22 (step S12). This location registration is performed by, for example, “Type: xx (location information)”, “Length”, “location information” of the IPv4 packet indicated as “Version: 4” of the standardized top position in FIG. Identifying “Option Type: xxx (location information)”, “Option Length”, and “location information” of an IPv6 packet indicated as “Version: 6” at the top position of the URL, and performing location registration according to the location information Can do. In addition, since the IPv4 packet and the IPv6 packet are standardized, description of other items is omitted.

  The location registration (step S11) from the terminals 26 and 27 corresponds to the location registration b1 from the terminal or other home terminal 1-2 in FIG. 2, and the home agent function unit 11 sets the type of received packet. In the case of a location registration request, the MN management information D1 for HA in the database 14 is searched by the home address HoA included in the location registration message, and it is determined whether or not the terminal allows location registration. In this case, the mobile IP related information including the HoA, CoA, and HA address is registered as the HA BC management information D2 in the database 14, and the location information registration b2 is requested to the location management function unit 13. This request step corresponds to step S12 in FIG.

  The location management function unit 13 collects the point information shown in FIG. 5A in response to the request for location information registration b2, specifies the point information from the received care-of address CoA or GPS information, ) To create position information having the same information elements as the awareness information. Then, referring to the care-of information, in the case of the first registration, the created position information is registered as care-of information and displayed on the terminal display 17 (see FIG. 2). If other notice information already exists, the distances from the home terminal are compared, sorted in order from the shortest distance, the created position information is registered, and displayed on the terminal display 17.

  After the above registration is completed, when a call is made from the IP telephone 25 to the IP telephone 24 connected to the home terminal 10 (step S13), it corresponds to the VoIP incoming call a1 to the home agent function unit 11 in FIG. The home agent function unit 11 refers to the HA BC management information D2 in the database 14, collects the care-of addresses CoA of all registered terminals, and includes the care-of addresses CoA of the terminals. In this case, it is determined whether or not the simultaneous call transfer flag shown in the HA call transfer information D6 in FIG. 3C is on. If it is on, the IP phone 24 is called (step S14) and at the same time the terminal 26 , 27, the VoIP packet is duplicated, and the destination of the duplicated VoIP packet is designated as the BC management information for HA in FIG. Convert to D2 HoA.

  At this time, the terminal 26 is converted to HoA1, and the terminal 27 is converted to HoA2. Then, the IP address of the HA address of the transmission source and the destination address of CoA (converted to ADDR2 for the terminal 26 and ADDR3 for the terminal 27) is used as the outer IP header of the VoIP (Voice over Internet Protocol) incoming packet. The packet is encapsulated and transferred to the terminals 26 and 27 (step S15). At this time, the incoming call transfer flag of the HA incoming transfer information D6 in FIG. 3C is turned on to indicate that the incoming call is being transferred. Also, in the transfer of VoIP incoming call or transfer by encapsulation, that is, IPinIP transfer operation, the incoming call transfer flag is turned off, the VoIP incoming call response is received by the requesting IP telephone 24, and the VoIP incoming packet is received by the home terminal. As a result, the transfer of VoIP incoming calls / IPinIP transfer is stopped.

  When an IPinIP-transferred VoIP incoming response packet (step S16) is received, the home agent function unit 11 (see FIG. 2) operates to determine the message type of the received packet and is encapsulated in the VoIP incoming response. If the incoming call transfer information D6 for HA is read, it is determined whether or not the incoming call transfer flag is on. If the incoming call transfer information D6 is on, the VoIP incoming call response is not sent to the IP telephone 25 of the VoIP incoming request source. After decapsulating the encapsulated VoIP incoming response, the VoIP incoming response is transferred to the IP telephone 25 that is the VoIP incoming request source (step S17), and the incoming transfer flag is set to OFF.

  If not encapsulated, the VoIP incoming response is transferred to the IP telephone 25 that is the VoIP incoming request source without decapsulation, and the incoming transfer flag is set off. When the incoming responses are received in the order of the terminals 26 and 27, the incoming call transfer flag is turned off during the incoming call response processing of the terminal 26, so the incoming response of the terminal 27 is not transferred to the request source. Even when the IP telephone 24 in the home network responds first, the incoming call transfer flag is turned off, so that the incoming call response from the terminals 26 and 27 is not transferred to the requesting IP telephone. That is, when incoming calls are transferred in order of increasing distance from the home terminal 10, communication with a terminal that has made an incoming call is enabled, and incoming transfer to other terminals is stopped.

  The terminals 26 and 27 show a case where an IP address different from the IP telephone 24 (IP address: ADDR1) in the home network is assigned as the home address HoA, the terminal 26 is assigned HoA1, and the terminal 27 is assigned HoA2. When there is one mobile terminal that requests IP incoming transfer, the same IP address as that of the IP telephone 24 can be used as the home address HoA of the terminal.

  9 and 10 show the operation flowchart of the home agent function unit 11 (see FIG. 2) by steps (A1) to (A46). The telephone 5, the IP telephone 2, the terminal or others in FIG. It is determined whether or not the input from the home terminal 1-2 or the like is a request for location registration (A1). If it is not location registration, the process proceeds to step (A7). In the case of a location registration request, information corresponding to HoA is collected from the MN management information D1 for HA (A2), and it is determined whether or not the terminal is to be allowed (A3). Exit. In the case of an acceptable terminal, location registration data (mobile IP related information including a care-of address) is registered in the area corresponding to HoA in the HA BC management information D2 (A4). The location information is notified to the location management function unit 13 (A5). And the response transmission with respect to a location registration is performed (A6).

  In step (A7), it is determined whether or not a VoIP call is received. If the call is a VoIP call, the process proceeds to step (A20). If the call is not a VoIP call, the process proceeds to step (A8). In this step (A8), it is determined whether or not a response packet has been received. If it is not a response packet, input error (A15) and the process is terminated. When a response packet is received, an incoming call transfer flag (see (C) in FIG. 3) of the HA incoming transfer information D6 is acquired (A9), and it is determined whether the incoming transfer flag is on (A10). ). If it is not on, the processing is terminated. If it is on, it is determined whether or not it is an encapsulated packet (A11). If it is an encapsulated packet, it is decapsulated (A12) and the HA incoming transfer information D6 is being transferred. The flag is turned off (A13), the VoIP incoming packet is transferred to the request source (A14), and the process is terminated.

  In step (A7), in the case of VoIP incoming call input determination, information corresponding to HoA is acquired from the HA BC management information D2 (A20), and the simultaneous incoming flag of HA incoming transfer information D6 (see FIG. 3). (See (C)) is obtained (A21), and it is determined whether or not the simultaneous incoming call is made (A22). If the simultaneous incoming call is made, it is transferred to the IP telephone 24 (see FIG. 6) (A23), and the step (A24 ) To (A29) are repeated for the HA BC management information. That is, the VoIP incoming packet is copied, the HoA of the corresponding BC management information for HA is set as the destination (A25), encapsulated by the destination CoA and the source HA (A26), and received at the terminals 26 and 27 (see FIG. 6). Transfer (A27), and turn on the incoming call transfer flag of HA incoming transfer information D6 (A28).

  If it is determined in step (A22) that simultaneous call reception is not being performed, it is determined whether or not there are a plurality of HA BC management information (A30). (A31), the VoIP incoming packet is duplicated, the HoA of the BC management information for the corresponding HA is set as the destination (A32), and the same steps (A33) to (A33) to the above steps (A26) to (A28) are set. The transfer process according to (A35) is performed.

  If there are a plurality of HA BC management information in step (A30), a location information acquisition request is made to location management function unit 13 (see FIG. 2) (A36), and IP telephone 24 (see FIG. 6). (A37) and steps (A38) to (A46) are repeated for the location information. That is, the BC management information for HA holding the same CoA as the location information CoA is acquired (A39), the VoIP incoming packet is duplicated, the HoA of the corresponding BC management information for HA is set as the destination (A40), and the destination CoA is encapsulated by the transmission source HA (A41), the incoming call is transferred to the terminals 26 and 27 (see FIG. 6) (A42), and the incoming call transfer flag (see (C) of FIG. 3) of the HA incoming transfer information D6 is set. The timer is turned on (A43), the timer is monitored (A44), and it is determined whether or not the incoming call transfer flag is off. If not, the process proceeds to step (A38), and if it is off, the process is terminated.

  11 and 12 show the operation of the location management function unit 13 (see FIG. 2) by steps (B1) to (B28), and it is determined whether or not the location information registration is input (B1). If it is not a location information registration input, it is determined whether it is a location information acquisition request (B15). If it is not a location information acquisition request, the process ends as an input error (B16). In the case of location information registration input, distance information is received from the terminal display 17 (see FIG. 2) and registered in the location information D5 (B2). In this case, since location registration from the terminal / foreign agent is only location information, distance information corresponding to location information is registered in advance. Then, the location information registration request from the home agent function unit 11 (see FIG. 2) is received (B3), the location information is collected from the location information D5 (B4), and it is determined whether or not it is the first registration (B5). In the first case, the location information of the terminal / foreign agent requested to be registered is registered (B6), and the location information of the registered terminal / foreign agent is displayed on the terminal display 17 (B7).

  If the location information registration is the second or more, steps (B8) to (B10) are repeated for the number of registrations, and it is determined whether or not the location information requested for registration is closer than the registered location information. If it is determined (B9) and close, the location management information of the terminal / foreign agent requested to be registered is registered in the area before the compared location information (B13). And it displays on the terminal display 17 similarly to step (B7) (B14). If the location information is farther than the registered location information, the location information of the terminal / foreign agent requested to be registered indicates the farthest location and is registered in the last area (B11). And it displays on the terminal display 17 similarly to step (B7) and (B14) (B12).

  In step (B15), in the case of determination of the location information acquisition request, the location information acquisition request from the home agent function unit 11 / foreign agent function unit 12 / terminal / location display device is received (B20). Location management information is collected from the information D6 (B21), and the acquisition request determines whether it is the home agent function unit 11 or the foreign agent function unit 12 (B22), and in the case of a request from either of them, the location management information Is returned for each list (B23).

  If the acquisition request is not from the home agent function unit 11 and the foreign agent function unit 12, steps (B24) to (B26) are repeated for the registered location information. That is, it is determined whether or not it matches the requested terminal information. If they match, the location management information is returned to the request source (B28), and if it does not match even after repeated, a message to that effect is returned to the request source (B27).

  13 and 14 show the operation of the foreign agent function unit 12 (see FIG. 2) by steps (C1) to (C25). The terminal 8 belongs to another home terminal 1-2 or another home terminal. It is determined whether or not the location registration request is input from (see FIG. 2) (C1). If the location registration request is received, the FA MN management information D3 is read (C2), and is the mobile terminal MN an allowed MN? It is determined whether or not (C3), and if it is not an allowable MN, the process is terminated. In the case of an allowed MN, the mobile IP information of the MN is recorded in the BC management information D4 for FA (C4), and a location information acquisition request is made to the location management function unit 13 (see FIG. 2) (C5). A location registration packet for the home agent is created, and its own foreign agent location information is added to it (C6), and location registration transmission is performed to the home agent belonging to the MN (C7).

  If it is determined in step (C1) that the input is not a location registration input, it is determined whether or not a location registration response is input (C8). If the location registration response is input, the FA BC management information D4 is set. Reading is performed (C9), the presence / absence of BC (binding cache) is determined (C10), if not, the process is terminated, and if present, it is determined whether the location registration response result is a normal response (C11). In the case of a normal response, the mobile IP information of the MN is recorded in the BC management information D4 for FA (C12), a location registration response packet for MN is created (C13), and a location registration response is transmitted to the MN (C14). ). If it is determined in step (C11) that the response is not normal, the presence / absence of BC is determined in the MN's FA BC management information (C15). If not, the process ends. The mobile IP information of the MN is deleted from the business BC management information D4 (C16), and the process ends.

  If it is determined in step (C8) that the position registration response is not input, it is determined whether or not it is a data packet input (C17). If it is not a data packet, the processing is accommodated. It is determined whether or not the packet is a packet (C18). If it is a capsule packet, the FA BC management information D4 is read (C19), and it is determined whether or not the destination address is in BC (C20). If yes, decapsulate and transfer the packet to the MN (C21).

  If it is determined in step (C18) that it is not a capsule packet, the FA BC management information D4 is read (C22), and it is determined whether or not the source address exists in the BC (C23). The process is terminated, and if it exists, it is encapsulated (C24), transmitted to the HA (C25), and the process is terminated.

  FIG. 15 is a process explanatory diagram of the second embodiment of the present invention, where the same reference numerals as those in FIG. 6 denote the same names. S21 to S28 indicate processing steps. The location registration step S21, the BC management / location management registration step S22, and the VoIP incoming steps S27 and S28 are the same as the location registration step S11 shown in FIG. The operation is the same as in step S12 for BC management / location management registration and steps S6 and S7 for VoIP incoming calls.

  That is, in the state where the location registration from the terminals 26 and 27 to the home terminal 10 is completed in step S21 and step S22, when the VoIP call addressed to the address ADDR1 is received from the IP telephone 25, the home agent of the home terminal 10 as described above. The function unit 11 (see FIG. 2) operates according to the flowcharts shown in FIGS. 9 and 10, and determines the message type of the received packet in steps (A1), (A7), and (A8). The HA BC management information D2 (see FIG. 3B) is searched, the CoAs of all registered terminals are collected, the CoA is registered, and the HA call transfer information D6 (( C))) When the general call transfer flag is off, the location management function unit 13 (see FIG. 2) collects location information in step S25. Make a request.

  In response to the location information acquisition request, the location management function unit 13 (see FIG. 1) operates according to the flowcharts shown in FIGS. 11 and 12, reads the location management information, and when the request source is the home agent function unit 11, FIG. As shown in (B) of FIG. 5, the home agent function unit 11 is responded by using, as response information, awareness information that has been sorted in advance from the home terminal 10 in order of increasing distance. Based on the acquired location management information (arranged in order of CoA), the home agent function unit 11 transfers the incoming call to the IP telephone 24 in the home network and copies the VoIP incoming packet at the same time in step S24. The destination of the VoIP incoming packet is converted to the HoA of the HA BC management information D2 holding the CoA of the nearest terminal, and the IP header with the source address as the HA address and the destination address as CoA is the outer IP header of the VoIP packet. VoIP incoming packet is encapsulated and IPinIP transfer is performed. At this time, the incoming call transfer flag in the HA incoming transfer information D6 (see FIG. 3C) is set to ON.

  If there is no response even after the elapse of a predetermined time set in advance, the VoIP incoming packet is encapsulated and IPinIP transfer is performed to the terminal at the next closest position in the same manner as described above. When a VoIP incoming call response is made in step S27, the home agent function unit 11 (see FIG. 2) of the home terminal 10 makes a response packet reception determination in step (A8) of the flowcharts shown in FIGS. When the incoming call transfer flag is turned off, the transfer process is stopped. In addition, if the VoIP incoming call response cannot be received even if the incoming call transfer is performed to the terminal at the farthest distance, the IPinIP transfer can be repeated again in order from the terminal at the shorter distance. When there is only one registered CoA, the incoming call transfer between the terminal and the IP telephone 24 can be repeated. That is, the incoming call transfer can be repeated until the incoming call transfer flag is turned off. If there is no registered CoA, the home terminal 10 is made to receive only the IP telephone 24 connected wirelessly or by wire.

  FIG. 16 is a process explanatory diagram of the third embodiment of the present invention. The same reference numerals as those in FIGS. 6 and 15 indicate the same name, 30 is a home terminal belonging to an external network, and 40 is a home similar to the function unit 20. Home terminal including an agent function unit 11, a foreign agent function unit 12 and a location management function unit 13 (see FIG. 2), 41 is a location management unit similar to the location management unit 21, and 42 is a BC similar to the BC management unit 22. The management unit 43 indicates a MN management unit similar to the MN management unit 23, and S31 to S39 and S300 to S302 indicate steps according to the processing order.

  The state shown in the figure corresponds to the case where the terminal 26 belonging to the home terminal 10 of the home network moves to the service range of the home terminal 30 of the external network. That is, this corresponds to the case where the terminal 3 moves from the home terminal 1-1 in FIG. 1 to another home terminal 1-2. And the terminal 26 performs position registration with respect to the home terminal 30 by step S31. Thereby, the home terminal 30 operates as a foreign agent (FA) of the terminal 26. The foreign agent function unit 12 (see FIG. 2) of the function unit 40 of the home terminal 30 that has received the location registration request from the terminal 26 other than its own home network operates according to the operation flowcharts shown in FIGS. That is, the message type of the received packet is determined (see step (C1) in FIG. 13), and in the case of location registration, the MN management information D3 for FA from the MN management 43 (see (A) in FIG. 4) is obtained in step S32. It is determined whether the MN information in the read / received packet is an allowable MN (see step (C3) in FIG. 13).

  If it is not an allowable MN, the received packet for location registration is discarded. In the case of the allowed MN, the mobile IP related information is recorded in the FA BC management information D4 (see FIG. 4B) (see step (C4) in FIG. 13). And the acquisition request of location information is performed to the location management function part 13 (refer FIG. 2) (refer step (C5) of FIG. 13). The location management function unit 13 operates according to the operation flowchart shown in FIGS. 11 and 12. That is, when an input determination is made and a location information acquisition request is made, if the request source is the foreign agent function unit 12, the location information of the home terminal 30 itself is acquired from the care-of information in FIG. To do.

  Next, in step S33, the location registration packet with the location information added is transmitted to the home terminal 10 of the home network of the terminal 26. The home terminal 10 receives the location registration of the terminal 26 belonging to its own network from the other home terminal 30, thereby performing location registration processing by the same processing as steps S11 and S12 shown in FIG. A location registration response is transmitted to the location registration source home terminal 30.

  When the home terminal 30 receives the location registration response, the foreign agent function unit 12 (see FIG. 2) of the function unit 40 operates according to the operation flowcharts shown in FIGS. 13 and 14 and determines that the location registration response is received (FIG. 13). Step (C8)), the FA BC management information D4 (see FIG. 4B) is read, and if there is BC information corresponding to the MN (terminal 26) information in the received packet (step (FIG. 13)). C10)), and determines whether or not the location registration response is normal (see step (C11) in FIG. 13). If it is a normal response, FA BC management information D4 (see (B) in FIG. 4) The BC active state of the mobile IP related information is set to active (see step (C12) in FIG. 13). In step S36, a location registration response packet is created and transmitted to the terminal 26.

  In the state where the terminal 26 is in the position registration process completion, in step S37, in the case of a VoIP call addressed to the address ADDR1 (IP telephone 24) from the IP telephone 25, the home terminal 10 returns to steps S14, S39 in FIG. Similar to S15, the VoIP incoming packet is encapsulated and transferred in IPinIP along with the VoIP incoming call transfer to the IP telephone 24 in the home network.

  When the home terminal 30 receives a VoIP incoming packet from another home terminal 10 in step S39, the foreign agent function unit 12 (see FIG. 2) of the function unit 40 determines the message type of the received packet. That is, it is determined whether it is a data packet (other than location registration / location registration response) (see step (C17) in FIG. 13), and in the case of a data packet, it is determined whether it is an encapsulated packet ( If the packet is an encapsulated packet, the FA BC management information D4 (see FIG. 4B) is read, and the destination address of the inner IP header is changed to the FA BC management information D4. It is determined whether or not it is registered (see step (C20) in FIG. 13). If registered, the outer IP header is decapsulated and transferred to the terminal 26 in step S300 (step (C21 in FIG. 13). )reference).

  When the home terminal 40 receives an incoming response from the terminal 26 in response to step S301, the foreign agent function unit 12 (see FIG. 2) of the function unit 40 determines the message type of the received packet and is an encapsulated packet. (See steps (C17) and (C18) in FIG. 13), and since it is not an encapsulated packet, the BC management information D4 for FA is read (see step (C22) in FIG. 14), and the source address is It is determined whether it is registered (see step (C23) in FIG. 14). If registered, an encapsulated packet is created with the IP header in which the address of the home agent to which the terminal 26 belongs is set as the destination address as the outer IP header (see step (C24) in FIG. 14), and the home terminal 40 IPinIP transfer is performed in S302.

  When the home terminal 10 receives the IPinIP transfer packet from the other home terminal 40, the home terminal 10 decapsulates the encapsulated VoIP incoming response packet as in steps S16 and S17 of FIG. 6 corresponding to steps S302 and S303. Then, the call is transferred to the IP telephone 25 that is the VoIP incoming call request source. That is, the home terminals 10 and 30 have a similar configuration including a home agent function unit 11, a foreign agent function unit 12, and a location management function unit 13, as shown in FIG. The incoming call can be transferred to the terminal 26 that has moved.

  FIG. 17 is a diagram for explaining the processing of the fourth embodiment of the present invention. The same reference numerals as those in FIGS. 6, 15, and 16 denote the same names, 28 denotes a terminal display (corresponding to the terminal display 17 in FIG. 2), Reference numeral 29 denotes a home terminal (personal computer). The process according to the order of steps S41 to S49 will be described. Step S41 shows a process of performing location registration in the home terminal 10 of the home network from the terminals 26 and 27 moved to the external network. The home agent function unit 11 (see FIG. 2) of the function unit 20 of the home terminal 10 In step S42, a location registration request is made to the location management function unit 13 (see FIG. 2) according to the flowcharts of FIGS.

  The location management function unit 13 of the function unit 20 operates according to the flowcharts of FIGS. That is, input determination is performed (see steps (B1) and (B15) in FIG. 11). In the case of location information registration, the location information of the terminals 26 and 27 is recorded in the location management information D5. The location information display notification is given to the display 28, for example, as shown in the figure.

  When the location information acquisition request for the terminal 26 is sent from the terminal 27 or the home terminal 29 to the home terminal 10 in step S45, the functional unit 20 collects the location management information of the terminal 26 in step S46. . At this time, the location management function unit 13 (see FIG. 2) of the home terminal 10 operates according to the flowcharts of FIGS. That is, when input determination is performed and it is determined in step (B15) in FIG. 11 that the request is for collecting location information, the location information is collected and searched from the location information D5, and the location information of the requested terminal 26 exists. Then, the location information is transmitted to the request source as a location information acquisition request response in step S47. If the location information of the terminal 26 is not registered as a result of the search, the fact that there is no information is transmitted. In the case of a location information acquisition request from, for example, the home terminal 30 in the external network, the location information held in the home terminal 10 is collected, a location information list is created, and the location information acquisition response is transmitted. Therefore, the location management function unit 13 of the home terminal 10 registers and manages the location information of an arbitrary number of terminals, so that the location information of other terminals can be managed from one terminal to the home terminal to which the terminal belongs. By requesting, the location information can be easily obtained.

(Appendix 1) In a home terminal having a home agent function in Internet communication, a location management function unit for managing location information of a terminal, communication processing between a subordinate IP phone and another phone, and the others An incoming IP packet from the telephone to the IP telephone is encapsulated by a header including a care-of address according to the location information of the terminal managed by the location management function unit and transferred, and the encapsulated IP from the terminal The home agent function unit that decapsulates the packet and transmits it to the other telephone, and determines whether or not the location registration request of the terminal under the other home terminal is acceptable. If yes, the location registration response is sent to the location registration request. Foreign agent machine that transmits to the terminal and registers the location information of the terminal in the location management function unit Home terminals, characterized in that a part.
(Supplementary Note 2) The home agent function unit causes an incoming call from the other telephone to be received by the IP telephone, and forwards it to all terminals where the location information is registered in the location management function unit. 2. The home terminal according to appendix 1, wherein a connection process with the other telephone is performed for a response.
(Supplementary Note 3) The location management function unit has a configuration for managing location information according to a location registration request from the terminal according to the order of distance from the home terminal, and the home agent function unit includes: The home terminal according to claim 1, wherein the home terminal has a configuration in which incoming calls from the other telephones are sequentially transferred according to the order of the distance of the terminals managed by the location management function unit.

(Supplementary Note 4) A database storing home agent mobile terminal management information, home agent binding cache management information, and home agent binding cache incoming transfer information managed by the location management function unit, respectively, and the location management In response to the location registration request from the terminal, the functional unit refers to the home agent mobile terminal management information in which the terminal management information that can be registered is stored, and determines whether registration is possible. The home terminal according to appendix 1, wherein the home terminal has a configuration for sending a location information registration request to the functional unit.
(Additional remark 5) It has the database which registered the location information of the mobile terminal managed by the said location management function part, and the said location management function part transfers the location information read from the said database with respect to the inquiry of the location location of a terminal The home terminal according to appendix 1, which has a configuration.

(Supplementary Note 6) In a call transfer service system for transferring incoming calls from other telephones to an IP telephone, a location management function unit for managing the location information of a terminal that permits call transfer, the IP telephone, and the other telephone And the IP packet received from the other telephone is encapsulated by a header including a care-of address according to the location information of the terminal managed by the location management function unit, and is transferred. A home agent function unit that decapsulates an IP packet encapsulated from the mobile phone and forwards the packet to the other telephone, and determines whether a location registration request from a terminal subordinate to the other home terminal is permitted. A foreign agent function unit for registering location information in the management function unit, and receiving an incoming call from the other telephone set. Call Transfer service system characterized by connecting a home terminal to be transferred to the terminal to the Internet.
(Supplementary Note 7) The home agent function unit and the foreign agent function unit determine whether or not the location registration request from the terminal is acceptable, and if possible, the location management function unit stores the location information of the terminal. The home agent function unit is configured to register information including distance information about the distance to the terminal position, and the home agent function unit receives incoming calls from the other telephones in order from the terminal with the closest distance in the location information of the terminal. The call transfer service system according to appendix 6, wherein the call transfer service system has a configuration for transferring a call.

It is principal part explanatory drawing of the system of Example 1 of this invention. It is explanatory drawing of a home terminal. It is explanatory drawing of a database. It is explanatory drawing of a database. It is explanatory drawing of a database. It is processing explanatory drawing of Example 1 of this invention. It is format explanatory drawing of an IPv4 packet. It is format explanatory drawing of an IPv6 packet. It is an operation | movement flowchart of a home agent function part. It is an operation | movement flowchart of a home agent function part. It is an operation | movement flowchart of a location management function part. It is an operation | movement flowchart of a location management function part. It is an operation | movement flowchart of a foreign agent function part. It is an operation | movement flowchart of a foreign agent function part. It is processing explanatory drawing of Example 2 of this invention. It is processing explanatory drawing of Example 3 of this invention. It is processing explanatory drawing of Example 4 of this invention.

Explanation of symbols

1-1, 1-2 Home terminal 2 IP telephone 3, 4 Mobile terminal 5 Telephone 6 Internet 7 Base station 10 Home terminal 11 Home agent function part 12 Foreign agent function part 13 Location management function part 14, 15, 16 Database 17 Terminal display

Claims (5)

In a home terminal having a home agent function in Internet communication,
A location management function unit that manages the location information of the terminal;
Includes a care-of address according to the location information of the terminal that manages communication processing between the IP phone under its control and another phone and an incoming IP packet from the other phone to the IP phone by the location management function unit A home agent function unit that encapsulates a header and performs transfer processing, decapsulates the encapsulated IP packet from the terminal, and transmits the packet to the other telephone;
Determines whether or not a location registration request of a terminal under another home terminal is acceptable, and if so, sends a location registration response to the location registration request terminal and registers the location information of the terminal in the location management function unit A home terminal characterized by comprising a foreign agent function unit.   The home agent function unit causes the IP phone to receive an incoming call from the other telephone, and forwards it to all terminals registered with the location information in the location management function unit. The home terminal according to claim 1, wherein the home terminal has a configuration for performing connection processing with the other telephone set.   The location management function unit is configured to manage location information in accordance with a location registration request from the terminal according to the order of distance from the home terminal, and the home agent function unit includes the location management function 2. The home terminal according to claim 1, further comprising a configuration in which incoming calls from the other telephones are sequentially transferred according to the order of the distance of the terminals managed by the unit. In a call transfer service system for transferring an incoming call from another telephone to an IP telephone,
A location management function unit that manages location information of a terminal that permits call forwarding, a communication process between the IP phone and the other phone, and an incoming IP packet from the other phone, the location management function unit A home agent function unit that encapsulates and transfers a header including a care-of address in accordance with the location information of the terminal managed by the terminal, decapsulates the encapsulated IP packet from the terminal, and forwards the packet to the other telephone. A foreign agent function unit for determining whether or not a location registration request from a terminal subordinate to another home terminal is possible, and registering location information in the location management function unit when the request is possible; A call transfer service characterized in that a home terminal for transferring an incoming call to the IP telephone and the terminal is connected to the Internet. System.   The home agent function unit and the foreign agent function unit determine whether or not the location registration request from the terminal is acceptable, and only when possible, the location management function unit stores the location information of the terminal up to the location of the terminal. The home agent function unit forwards incoming calls from the other telephones in order from the terminal with the shortest distance in the location information of the terminal. 5. The call transfer service system according to claim 4, further comprising:

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