JP2009055455A - Communication system and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an achieving method of incoming service control, when transmitted to a 3G terminal existing in a 3G network from a 3G terminal existing in an IMS network. <P>SOLUTION: In this communication system S, when accepting a transmission request from the 3G terminal existing in the IMS network 3, a range existence control part 62 provided in an HLR 23 of an incoming side 3G network 20 determines whether or not an incoming terminal 9 is the 3G terminal existing in the 3G network 1 based on member information stored in the HLR 23 arranged in the 3G network 1. Then, when determining that the incoming terminal 9 is the 3G terminal existing in the 3G network 1, an O-AS33 arranged in a range existence network of a transmission terminal 8 performs the incoming service control. That is, the incoming service control is performed in response to an incoming service control method in the 3G network 1 in which the incoming terminal 9 exists. Thus, when the transmission terminal 8 exists in the IMS network 3 and the incoming terminal 9 exists in the 3G network 1, the incoming service control can be performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication system and a communication method in a communication network to which mobile communication networks having different architectures are connected.

As a conventional mobile communication network, there is a so-called 3G (3rd Generation) network. This conventional 3G network handles voice services using a circuit switching (CS) circuit. In contrast, an IMS (IP Multimedia Core Network Subsystem) network provides voice services over IP (Internet Protocol), and is defined in 3GPP (3rd Generation Partnership Project) described in Non-Patent Document 1 below. It is a communication network that adopts the specifications.
3GPP TS 23.228 V7.5.0 (2006-09), 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS); Stage 2 (Release 7), [Search May 2, 2007], Internet http://www.3gpp.org/ftp/Specs/archive/23_series/23.228/23228-750.zip

  On the other hand, by accommodating the conventional 3G wireless network in the IMS switching system, the mobile terminal for the conventional 3G network (hereinafter referred to as 3G terminal) designed for the architecture of the conventional 3G network is used as the IMS network. A method for providing voice and multimedia services in the area has been proposed.

  The so-called conventional 3G network and IMS network have different network architectures. For example, the incoming service control method is different. The incoming service control is control for providing information based on the status of the incoming terminal to the outgoing terminal, for example, control for providing guidance for an answering machine service or an unwanted telephone service. The 3G network is constructed so that incoming service control is performed in the visited terminal network. On the other hand, the IMS network is configured to perform incoming service control in the visited network of the incoming terminal.

  During the transition from the conventional 3G network to the IMS network, the conventional 3G network and the IMS network are mixed. In this transition period, when a 3G terminal located in the IMS network and a 3G terminal located in the conventional 3G network perform outgoing / incoming calls, the originating 3G terminal is located in the IMS network and the incoming 3G terminal Is in the conventional 3G network, incoming call service control cannot be performed.

  Therefore, in the present invention, in the mixed period of 3G network and IMS network, it is possible to perform incoming service control even when a call is made from a 3G terminal located in the IMS network to a 3G terminal located in the 3G network. An object of the present invention is to provide a communication system and a communication method.

  The communication system of the present invention includes a first mobile communication network in which first control means for performing incoming service control for providing information based on the status of the incoming terminal to the outgoing terminal in the visited network of the incoming terminal is arranged. And a second mobile communication network in which second control means for controlling the incoming call service in the visited network of the transmitting terminal is connected, the second mobile communication network And a storage means for storing information on a special mobile terminal located in the second mobile communication network and having a system based on the architecture of the second mobile communication network, and the first mobile communication network Receiving means for receiving a transmission request including information for identifying a receiving terminal from a transmitting terminal which is a special mobile terminal, and whether the receiving terminal specified by the information included in the transmission request is a special mobile terminal By storage means Determining means for determining based on the stored information, and additional control means arranged in the visited network of the calling terminal in the first mobile communication network and performing incoming service control, the additional control means, When the determining means determines that the receiving terminal is a special mobile terminal, it performs incoming service control. The first control means performs the incoming service control when the determining means determines that the receiving terminal is not a special mobile terminal. It is characterized by performing.

  The communication method of the present invention provides a first mobile communication network in which first control means for performing incoming service control for providing information based on the status of the incoming terminal to the outgoing terminal in the visited network of the incoming terminal is arranged. And a second mobile communication network connected to a second mobile communication network in which second control means for performing incoming service control in a visited terminal network is disposed, In the state where the storage means arranged in the first mobile station stores information of a special mobile terminal located in the second mobile communication network and having a system based on the architecture of the second mobile communication network The accepting means arranged in the body communication network accepts a sending request including information for identifying the receiving terminal from the sending terminal which is the first mobile terminal, and the judging means is specified by the information included in the sending request. The receiving terminal is special A determination step for determining whether or not the mobile terminal is based on the information stored by the storage means, and an additional control means disposed in the visited terminal network of the first mobile communication network in the determination step When it is determined that the receiving terminal is a special mobile terminal, the additional control step for controlling the incoming service and the first control means receive the incoming call when it is determined in the determining step that the receiving terminal is not the special mobile terminal. And a basic control step for performing service control.

  According to the present invention, when the accepting means arranged in the first mobile communication network accepts an outgoing call request from the originating terminal which is the first mobile terminal, the judging means is arranged in the second mobile communication network. Based on the information stored in the storage means, it is determined whether the receiving terminal is a special mobile terminal. When the receiving terminal is a special mobile terminal, this is a situation where, for example, a 3G terminal located in the IMS network makes a call to a 3G terminal located in the 3G network. At this time, when it is determined that the receiving terminal is a special mobile terminal, additional control means arranged in the visited network of the transmitting terminal performs incoming service control. That is, the incoming service control is performed in accordance with the incoming service control method in the second mobile communication network in which the incoming terminal is located. This is a case where the calling terminal is in the first mobile communication network (for example, IMS network) and the receiving terminal is in the second mobile communication network (for example, 3G network). Can also perform incoming service control.

  The incoming service control is, for example, control for transmitting voice guidance as information based on the status of the incoming terminal to the outgoing terminal.

  According to the present invention, in a mixed period of a conventional 3G network and an IMS network, even when a call is transmitted from a 3G terminal located in the IMS network to a 3G terminal located in the conventional 3G network, the incoming service control is performed. It can be performed.

  The best embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration of a communication network including a 3G network and an IMS network according to the present embodiment. The communication network N is a mobile communication network including a 3G network (second mobile communication network) 1 and an IMS (IP Multimedia Subsystem) network (first mobile communication network) 3. The 3G network 1 and the IMS network 3 are mobile communication networks based on 3GPP (3rd Generation Partnership Project) standards.

  The 3G network 1 is a communication network that handles voice services by a circuit switching method. In contrast to the 3G network 1, the IMS network 3 is a communication network that handles voice and multimedia services over IP (Internet Protocol).

  The communication network N accommodates 3G terminals and IMS terminals. The 3G terminal is a mobile terminal having a system based on the architecture of the 3G network 1 using the 3G network 1 as a home network. The IMS terminal is a mobile terminal having a system based on the architecture of the IMS network 3 using the IMS network 3 as a home network.

  In the communication network N, the 3G network 1 and the IMS network 3 are connected to each other so that a 3G terminal located in the 3G area and a 3G terminal located in the IMS area can be connected to each other and can communicate and transmit / receive data. ing. The 3G terminal (special mobile terminal) located in the 3G area is a 3G terminal located in the 3G network 1. An IMS in-zone 3G terminal is a 3G terminal in the IMS network 3. The IMS network 3 includes an interworking device 6 for accommodating the 3G terminal 5. The 3G terminal 5 can communicate via the IMS network 3 in the area by transmitting / receiving signals to / from the CSCF (Call / Session Control Function) 7 via the interworking device 6.

  The CSCF 7 is a logical node that processes a SIP (Session Initiation Protocol) message in a standard IMS, and controls user registration and session setting.

  The communication network N provides an incoming call service. The incoming call service is a service that provides information based on the status and settings of the incoming call terminal to the outgoing call terminal via a circuit-switched network when making a call. The incoming call service sends voice guidance to the calling terminal according to the setting contents or service contents at the receiving terminal. This voice guidance is information provided at the time of the incoming call service based on the situation and setting of the receiving terminal. The incoming service is, for example, an answering machine service, an unwanted telephone service, or the like.

  With the answering machine service, if there is a call from the calling terminal to the receiving terminal while the answering machine is set up at the receiving terminal, voice guidance is sent to the calling terminal. For example, a voice guidance such as “This is an answering machine center. Please give me a message.” Is received, a message from the user of the calling terminal is received, and registered in the answering machine center.

  The nuisance call service means that when a call is made from a specific terminal (calling terminal) to the receiving terminal when the nuisance call is set for the telephone number of the specific terminal at the receiving terminal, voice guidance is sent to the calling terminal. . For example, voice guidance such as “This phone cannot be connected due to customer's request” is played.

  The incoming service control for providing such an incoming service is different between the standard 3G network 1 and the IMS network 3. The incoming service control is control for providing voice guidance of the incoming service to the calling terminal. In the standard 3G network 1, incoming service control is performed in the originating communication network. In contrast, in the standard IMS network 3, incoming service control is performed in the communication network on the called side. Incoming service control between the 3G network 1 and the IMS network 3 will be described.

  First, incoming service control in the 3G network 1 will be described. As shown in FIG. 1, a case will be described in which a transmission terminal 8 located in the 3G network 1 makes a call to a receiving terminal 9 also located in the 3G network 1. The originating 3G network 10 in which the transmitting terminal 8 is located includes a G-MSC (Gateway Mobile Switching Center) 11 and an MSC (Mobile Switching Center; second control means) 12.

  Similarly, the called 3G network 20 where the receiving terminal 9 is located includes G-MSCs 21 and MSCs 22. The 3G network 1 includes an HLR (Home Location Register; storage means) 23. The HLR 23 is a logical node that manages a subscriber information database defined in the 3G network, and registers service setting information indicating the setting state of the incoming service in association with the telephone number of the 3G terminal.

  The incoming service is provided as follows. When the MSC 12 accepts the outgoing call request transmitted from the outgoing terminal 8, the incoming translation request for the incoming terminal 9 is sent to the HLR 23. In response to the incoming translation request, the service setting information and the connection destination information are requested. The connection destination information is location registration information of the receiving terminal 9.

  The HLR 23 transmits the service setting information set for the receiving terminal and the connection destination information to the MSC 12 as an incoming translation response in response to the incoming translation request. The MSC 12 transmits a control signal to the guidance device so as to perform voice guidance according to the set incoming service. As a result, the MSC 12 performs incoming service control. When the guidance device receives the control signal, the guidance device synthesizes the guidance voice according to the control signal and sends out the voice guidance. As described above, in the 3G network 1, the incoming side service control and the incoming service are provided in the originating side 3G network 10.

  Next, the incoming service control in the IMS network 3 will be described with reference to FIG. FIG. 2 is a diagram showing a configuration for incoming service control between IMS networks according to the present embodiment. A case will be described in which a transmission is made from a transmitting terminal 8 located in the IMS network 3 to a receiving terminal 9 also located in the IMS network.

  The originating IMS network 30 in which the transmitting terminal 8 is located includes an interwork device 32 for accommodating the CSCF 31 and 3G. Similarly, the destination IMS network 40 in which the receiving terminal 9 is located includes a CSCF 41, an interwork device 42, and a CS-AS (Call Session Application Server; first control means) 43.

  The CS-AS 43 is an AS (Application Server) that performs incoming service control in a standard IMS. Further, the IMS network 1 includes an HSS (Home Subscriber Server) 44. The HSS 44 is a logical node that manages a subscriber information database defined in the standard IMS. In the HSS 44, service setting information is registered as subscriber information in association with the telephone number of the 3G terminal in the IMS area.

  The incoming service is provided as follows. When the CSCF 31 receives a call request transmitted from the call terminal 8 via the interworking device 32, it makes an incoming call translation request to the HSS 44. This incoming translation request is for requesting connection destination information. When the CSCF 31 acquires the connection destination information, the CSCF 31 establishes a session with the CSCF 41 of the destination IMS network 40.

  Then, the CSCF 41 recognizes that there is a call to the receiving terminal 9 and establishes a session with the CS-AS 43. Then, the CS-AS 43 recognizes the set incoming service and controls the guidance device (not shown) to transmit the voice guidance as the incoming service to the transmitting terminal 8. As described above, in the IMS network 3, incoming service control is performed in the destination IMS network 40.

  With the existing configuration of incoming service control between the 3G networks 1 or between the IMS networks 3 described above, when a call is made from a 3G terminal located in the IMS network 3 to a 3G terminal located in the CS network 1, Incoming service control cannot be performed. A communication system S according to the present embodiment that enables this will be described with reference to FIG. FIG. 3 is a diagram illustrating a configuration of a communication system according to the present embodiment.

  In order to describe the configuration of the communication system S, the transmitting terminal 8 and the receiving terminal 9 are 3G terminals, the transmitting terminal 8 is located in the calling IMS network 30, and the receiving terminal 9 is the called 3G network 20 or the called side. It is assumed that the user is in the IMS network 40.

  The destination side 3G network 20 includes the G-MSC 21, the MSC 22, and the HLR 23 as the nodes of the standard 3G network as described above. The destination IMS network 40 includes the CSCE 41, the interwork device 42, the HSS 43, and the CS-AS 44 as standard IMS nodes as described above. The destination IMS network 40 includes an MRF (Multimedia Resource Function) 45 as a standard IMS function. The MRF 45 is a logical node that transmits voice guidance on a standard IMS.

  The originating IMS network 30 includes an MGCF (Media Gateway Control Function) 34 and an MRF 35 included in the standard IMS network in addition to the CSCF 31 and the interwork apparatus 32 described above. The MGCF 34 is a node serving as a gateway for controlling media conversion between circuit switching and IP in order to connect to the destination 3G network 30.

  Further, the originating IMS network 30 includes an O-AS 33 as an AS that performs the additional function according to the present invention. The O-AS 33 is connected to the HLR 23 of the arrival side 3G network 20 by, for example, a common line. The O-AS 33 makes a similar incoming translation request to the HLR 23 for the incoming translation request made by the MSC 12 of the originating 3G network 10. As a result, the O-AS 33 receives the incoming translation response from the HLR 23 and performs incoming service control.

  The incoming call translation by the O-AS 33 and the HLR 23 will be described in detail with reference to FIG. FIG. 4 is a diagram illustrating a configuration of the O-AS and the HLR according to the present embodiment.

  The O-AS 33 includes a SIP signal receiving unit 51, a calling side service control unit 52, an incoming translation request sending unit 53, an incoming translation response receiving unit 54, and an SIP signal transmitting unit 55. When the SIP signal receiving unit 51 receives the SIP signal (SIP_INVITE) from the CSCF 31, the SIP signal receiving unit 51 outputs the received SIP signal to the originating service control unit 52. When receiving the SIP signal, the originating service control unit 52 controls the incoming translation request sending unit 53 to send the incoming translation request to the HLR 23.

  The incoming translation request sent by the incoming translation request sending unit 53 is a MAP message using the same protocol as the incoming translation request sent by the MSC 12 of the originating 3G network 10 to the HLR 23. Therefore, the HLR 23 performs the same process as when receiving an incoming translation request from the MSC 12 of the originating 3G network 10 and returns an incoming translation response to the O-AS 33.

  When receiving the incoming translation response transmitted from the HLR 23, the incoming translation response receiving unit 54 outputs the received incoming translation response to the SIP signal transmitting unit 55. Then, the SIP signal transmission unit 55 outputs a control signal corresponding to the incoming translation response to the CSCF 31.

  In order to describe the incoming call translation response, the configuration of the HLR 23 will be described. The HLR 23 includes an incoming translation request receiving unit 61, an in-zone determination control unit (determination means) 62, a database 63, an incoming service determination control unit 64, and an incoming translation response sending unit 65.

  When receiving the incoming translation request, the incoming translation request receiving unit 61 outputs at least a signal indicating information such as the telephone number of the incoming terminal 9 included in the incoming translation request to the in-zone determination control unit 62. When receiving a signal from the incoming translation request receiving unit 61, the located area determining control unit 62 refers to the database 63 to determine the located state of the receiving terminal 9.

  The database 63 stores information indicating whether or not the terminal whose location is registered in the 3G network 1 is a 3G terminal in the 3G area. In the database 63, information indicating whether or not various incoming services are currently set is registered as subscriber information.

  The in-zone determination control unit 62 determines whether or not the receiving terminal 9 is a 3G terminal in the 3G area based on information stored in the database 63. For example, the location determination control unit 62 refers to the database 63 and first determines whether the receiving terminal 9 is in the 3G network 1 or not.

  When the receiving terminal 9 is located in the 3G network 1, the located area determination control unit 62 refers to the database 63, and the receiving terminal 9 is a 3G terminal located in the 3G area or a 3G terminal located in the IMS area. To determine. For example, in this way, the area determination control unit 62 determines whether or not the receiving terminal 9 is a 3G terminal in the 3G area.

  When it is determined that the incoming terminal 9 is in the IMS network 3 and the incoming terminal 9 is not a 3G terminal in the 3G area, the presence determination control unit 62 outputs a signal indicating that to the incoming translation response sending unit 65. . In this case, the incoming translation response sending unit 65 returns an incoming translation response including information that the incoming terminal 9 is not a 3G terminal located in the 3G area to the O-AS 33.

  When the visiting area determination control unit 62 determines that the receiving terminal 9 is a 3G terminal in the 3G area, the receiving service determination control unit 64 refers to the database 63 to determine the setting of the receiving service of the receiving terminal 9. . For example, it is determined whether the setting of the answering machine service or the nuisance telephone service is activated.

  The in-zone determination control unit 62 outputs information indicating that the receiving terminal 9 is a 3G terminal in the 3G region to the incoming translation response sending unit 65 together with the determination result. In this case, the incoming translation response sending unit 65 outputs to the O-AS 33 an incoming translation response including information on the service whose setting is activated and information indicating that the incoming terminal 9 is a 3G terminal in the 3G area.

  The incoming translation response is output to the O-AS 33 as described above. When the O-AS 33 receives an incoming translation response including information indicating that the incoming terminal 9 is a 3G terminal located in the 3G area from the HLR 23, the O-AS 33 performs incoming service control for transmitting voice guidance by the MRF 35. Specifically, the SIP signal transmission unit 55 of the O-AS 33 sends a control signal for controlling the MRF 35 included in the originating IMS network 30 to the CSCF 31. Therefore, in this case, the incoming service control is executed in the visited network of the transmitting terminal 8.

  When the O-AS 33 receives an incoming call translation response including information indicating that the receiving terminal 9 is not a 3G terminal in the 3G area from the HLR 23, the O-AS 33 receives the incoming call between the destination IMS network 20 and the normal IMS network. A control signal for performing service control is output to the CSCF 31. As a result, the incoming service control is executed in the visited network of the receiving terminal 9 as in the normal IMS.

  The operation of the communication system S according to the present embodiment described above will be described, and the communication method according to the present embodiment will be described. FIG. 5 is a flowchart showing the operation of the communication system according to the present embodiment.

  First, a transmission request transmitted from the transmission terminal 8 via the interworking device 32 is received by the CSCF 31 (step S1; reception step). That is, in the accepting step, a call origination request is accepted from a 3G terminal located in the IMS network 3. When the call request is accepted, it is determined by the location determination control unit 62 of the HLR 23 whether or not the receiving terminal 9 is a 3G terminal and a 3G terminal located in the 3G network 1 (step S2; determination step). .

  When it is determined that the receiving terminal 9 is a 3G terminal in the 3G area (YES in step S3), the incoming service control is executed by the O-AS 33 of the originating IMS network 30 (step S3; additional control step). . If it is determined that the receiving terminal 9 is not a 3G terminal in the 3G area (NO in step S3), the incoming service control is executed by the CS-AS 44 of the destination IMS network 40 (S4; basic control step). In this way, incoming service control is executed.

  Subsequently, the operation of the communication system S will be described in more detail. First, with reference to FIG. 6, the operation when the receiving terminal 9 is a 3G terminal located in a 3G area and the setting of incoming service control is performed will be described. FIG. 6 is a sequence diagram showing an operation of performing incoming service control when the receiving terminal is a 3G terminal located in the 3G network 1 in the communication system S according to the present embodiment. .

  First, the CC_SETUP message is transmitted to the interworking device 32 of the originating IMS network 30 by the originating terminal 8 of the originating IMS network 30 (step S10). In response to the transmission of the CC_SETUP message, the CC_CALLPROC message is returned to the originating terminal 8 of the originating IMS network 30 by the interwork device 32 of the originating IMS network 30 (step S11).

  The CC message received from the calling terminal 8 in the interwork device 32 is converted into a SIP message by the interwork device 32 (step S12). The SIP_INVITE message generated by the conversion is transmitted to the CSCF 31 of the originating IMS network 30 by the interwork device 32 of the originating IMS network 30 (step S13). As a result, a call request from the caller terminal 8 is accepted by the CSCF 31 of the caller IMS network 30.

  Subsequently, the SIP_INVITE message is transmitted to the O-AS 33 of the originating IMS network 30 by the CSCF 31 of the originating IMS network 30 (step S14). Then, the MAP_incoming translation request message is transmitted to the HLR 23 of the called side 3G network 20 by the O-AS 33 of the calling side IMS network 30 (step S15).

  When the MAP_incoming translation request message is received by the destination 3G network 20HLR 23, the in-territory determination control unit 62 of the HLR 23 determines that the incoming terminal 9 is a 3G terminal in the 3G area (step S16). Subsequently, it is determined by the incoming service determination control unit 64 of the HLR 23 that the incoming service of the incoming terminal 9 is activated (step S17).

  When the incoming service is determined, the MAP_incoming translation response message including information indicating that the incoming terminal 9 is a 3G terminal in the 3G area and the incoming service is activated is issued by the HLR 23 of the destination 3G network 20. The data is transmitted to the O-AS 33 of the side IMS network 30 (step S18). When the MAP_incoming translation response message is received by the O-AS 33 of the originating IMS network 30, a SIP_INVITE message is sent as a control signal for incoming service control by the O-AS 33 of the originating IMS network 30 to the CSCF 31 of the originating IMS network 30. (Step S19). That is, incoming service control is performed by the O-AS 33 of the originating IMS network 30.

  In response to the transmitted SIP_INVITE message, a SIP_INVITE message for requesting voice guidance is transmitted to the MRF 35 of the originating IMS network 30 by the CSCF 31 of the originating IMS network 30 (step S20). In response, a SIP_200OK message indicating that the voice guidance request has been successful is transmitted to the CSCF 31 of the originating IMS network 30 by the MRF 35 of the originating IMS network 30 (step S21).

  When the SIP_200 OK message is received by the CSCF 31 of the originating IMS network 30, a SIP_183 Session Progress message is transmitted to the interworking device 32 of the originating IMS network 30 by the CSCF 31 of the originating IMS network 30 (step S22). When the SIP_183Session Progress message is received by the interworking device 32 of the originating IMS network 30, the received message is converted from the SIP message to the CC message (step S23), and the CC_DISCONNECT message is changed to the interface of the originating IMS network 30. The data is transmitted from the work device 32 to the transmission terminal 8 of the originating IMS network 30 (step S24).

  Thereafter, the guidance connection is established between the MRF 35 of the originating IMS network 30 and the originating terminal 8 of the originating IMS network 30, and voice guidance for the incoming service flows from the MRF 35 to the originating terminal 8 (step S25). As described above, when the calling terminal 8 is in the IMS network and is a 3G terminal, and the receiving terminal 9 is in the 3G network 1 and is a 3G terminal, the incoming service control and the incoming service are provided. Done.

  Next, with reference to FIG. 7, the operation when the receiving terminal 9 is a 3G terminal in the IMS area and the setting of the incoming service control is performed will be described. FIG. 7 is a sequence diagram illustrating an operation of performing incoming service control when the incoming terminal is located in the 3G terminal and the IMS network in the communication system S according to the present embodiment.

  Even if the receiving terminal 9 is a 3G terminal in the IMS area, the MAP_incoming translation request message is obtained in steps S30 to S35 similar to steps S10 to S15 in FIG. Is transmitted to the HLR 23 of the 3G network 1 by the O-AS 33 of the originating IMS network 30.

  When the MAP_incoming translation request message is received by the HLR 23, the in-territory determination control unit 62 of the HLR 23 determines that the incoming terminal 9 is a 3G terminal in the IMS area (step S36). That is, it is determined by the location determination control unit 62 of the HLR 23 that the receiving terminal 9 is not a 3G terminal located in the 3G network 1 (3G terminal in the 3G location). Then, a MAP_incoming translation response message including information indicating that the receiving terminal 9 is not a 3G terminal in the 3G area is transmitted to the O-AS 33 of the originating IMS network 30 by the HLR 23 of the 3G network 1 (step S37). .

  When the MAP_incoming translation response message is transmitted, a SIP_INVITE message for performing an incoming service control in a normal IMS is transmitted to the CSCF 31 of the originating IMS network 30 by the O-AS 33 of the originating IMS network 30 (step S38). In response to the transmitted SIP_INVITE message, a DiameterLocationInformationReq. Message for inquiry is transmitted to the HSS 43 of the destination IMS network 40 by the CSCF 31 of the originating IMS network 30 (step S39).

  When the Diameter LocationInformationReq. Message is received by the HSS 43 of the destination IMS network 40, a connection destination information response is made by the HSS 43 of the destination IMS network 40 (step S41), and the Diameter Location Information Answer message is sent from the destination IMS network 40. The data is transmitted to the CSCF 31 of the originating IMS network 30 by the HSS 43 (step S41).

  Subsequently, the SIP_INVITE message is transmitted to the CSCF 41 of the destination IMS network 40 by the CSCF 31 of the originating IMS network 30 (step S42). When the SIP_INVITE message is received by the CSCF 41 of the destination IMS network 40, the SIP_INVITE message is transmitted by the CSCF 41 of the destination IMS network 40 to the CS-AS 44 of the destination IMS network 40 in order to determine the incoming service. (Step S43).

  When the SIP_INVITE message is received by the CS-AS 44 of the called-side IMS network 40, it is determined by the CS-AS 44 of the called-side IMS network 40 that the receiving service of the receiving terminal 9 is activated (step S44). If it is determined that the incoming service is activated, a SIP_INVITE message for sending voice guidance is transmitted to the CSCF 41 of the destination IMS network 40 by the CS-AS 44 of the destination IMS network 40 (step S45). . As a result, incoming service control is performed.

  When the SIP_INVITE message is received by the CSCF 41 of the destination IMS network 40, a SIP_INVITE message for sending voice guidance is transmitted to the MRF 45 of the destination IMS network 40 by the CSCF 41 of the destination IMS network 40 (step S46). . In response to the SIP_INVITE message, a SIP_200OK message indicating that the request was successful is transmitted to the CSCF 41 of the destination IMS network 40 by the MRF 45 of the destination IMS network 40 (step S47).

  When the SIP_200 OK message is received by the CSCF 41 of the destination IMS network 40, the SIP_200OK message is transmitted by the CSCF 41 of the destination IMS network 40 to the CS-AS 44 of the destination IMS network 40 (step S48). Then, the SIP_183 SessionProgress message is transmitted to the CSCF 41 of the destination IMS network 40 by the CS-AS 44 of the destination IMS network 40 (step S49).

  When the SIP_183 Session Progress message is received by the CSCF 41 of the destination IMS network 40, the SIP_183 Session Progress message is transmitted to the CSCF 31 of the source IMS network 30 by the CSCF 41 of the destination IMS network 40 (step S50). When the SIP_183 Session Progress message is received by the CSCF 31 of the originating IMS network 30, the SIP_183 Session Progress message is transmitted to the interworking device 32 of the originating IMS network 30 by the CSCF 31 of the originating IMS network 30 (step S51).

  When the SIP_183 Session Progress message is received by the interworking device 32 of the originating IMS network 30, the received message is converted from the SIP message to the CC message, and the CC_DISCONNECT message is changed to the interworking device 32 of the originating IMS network 30. To the originating terminal 8 of the originating IMS network 30 (step S52).

  Thereafter, the guidance connection is established between the MRF 45 of the destination IMS network 40 and the originating terminal 8 of the originating IMS network 30, and voice guidance for the incoming service flows from the MRF 45 to the originating terminal 8 (step S53). As described above, when the calling terminal 8 is located in the IMS network and is a 3G terminal, and the receiving terminal 9 is located in the IMS network and is a 3G terminal, the incoming service control and the incoming service are performed. Is called.

  In the communication system S according to the present embodiment described above, when a call request is received from a 3G terminal located in the IMS network 3, the located area determination control unit 62 provided in the HLR 23 of the called side 3G network 20 causes the 3G network 1 to Based on the subscriber information stored in the arranged HLR 23, it is determined whether the receiving terminal 9 is in the 3G network 1 and is a 3G terminal. In other words, it is determined whether or not the 3G terminal located in the IMS network 3 makes a call to the 3G terminal located in the 3G network 1. Subsequently, when it is determined that the receiving terminal 9 is in the 3G network 1 and is a 3G terminal, the O-AS 33 disposed in the visiting network (the originating IMS network 30) of the transmitting terminal 8 controls the incoming service. I do. That is, the incoming service control is performed in accordance with the incoming service control method in the 3G network 1 where the incoming terminal 9 is located. Thereby, even when the calling terminal 8 is located in the IMS network 3 and the receiving terminal 9 is located in the 3G network 1, the incoming service can be controlled.

  By the way, the communication system S according to the present embodiment executes the incoming service control in the originating IMS network 3 when the 3G terminal located in the IMS network 3 makes a call to the 3G terminal located in the 3G network 1. This makes it possible to control incoming services. On the other hand, when a call is made from a 3G terminal located in the IMS network 3 to a 3G terminal located in the 3G network 1, it is conceivable that the incoming service control is executed in the called 3G network 1. In this case, since the incoming service control is performed by the incoming side 3G network 20, a voice signal as guidance information is transmitted from the sound source device 24 provided in the incoming side 3G network 20. Such a comparative example will be described.

  A communication system S100 according to a comparative example will be described with reference to FIG. FIG. 8 is a diagram illustrating a configuration of a communication system according to a comparative example. The originating IMS network 30 includes an MGW (Media Gateway Function) 36 in addition to the above-described configuration nodes. The MGW 36 is a node serving as a gateway to the circuit switching network on the IMS, and is connected to the G-MSC 21 of the destination 3G network 20. The MGW 36 transmits the data signal received from the G-MSC 21 of the destination 3G network 20 to the transmitting terminal 8 via the interwork device 32.

  Therefore, the audio signal transmitted from the sound source device 24 of the destination side 3G network 20 is transmitted to the source side IMS network 30 via the G-MSC 21 of the destination side 3G network 20. Then, the MGW 36 of the originating IMS network 30 is received and transmitted to the receiving terminal 9 via the interwork device 32.

  However, in the transmission path from the sound source device 24 of the destination side 3G network 20 to the receiving terminal 9, the coding scheme being handled is not unified. The sound source device 24 is generally G.D. An audio signal encoded by the 711 (PCM) encoding method is transmitted. This is because it is an uncompressed audio signal and it is easy to process the accumulated audio data.

  The terminating side 3G network 20 and the originating side IMS network 30 are connected by an ATM line 91. The ATM line 91 is a line capable of hunting a variable band per line, and can pass a signal encoded by the AMR encoding method. However, the ATM line 91 is connected to the G.D. A signal encoded by the 711 (PCM) encoding method cannot be passed. Therefore, it is necessary to transmit and receive a signal encoded by the AMR encoding method between the G-MSC 21 of the destination side 3G network 20 and the MGW 36 of the source side IMS network 30.

  On the other hand, the signal transmitted to the 3G terminal needs to be a signal encoded by the AMR encoding method. For this reason, the originating IMS network 30 is configured to transmit and receive between the MGW 36 and the receiving terminal 9 using a signal encoded by the AMR encoding method.

  Therefore, if the incoming service control is to be performed in the destination 3G network 20, the voice signal transmitted from the sound source device 24 of the destination 3G network 20 is converted to the G.D. It is necessary to newly install a codec device for converting from the 711 (PCM) encoding method to the AMR encoding method. For this reason, it is necessary to add equipment for performing incoming service control, which is problematic.

  Compared to the communication system S100 according to this comparative example, the communication system S according to the present embodiment performs incoming service control in the originating IMS network 30, so that it is not necessary to newly install a codec device and suppress equipment. Can do.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, it is determined whether or not the receiving terminal 9 is a 3G terminal located in the 3G area based on information stored in the database 63 of the HLR 23, but the present invention is not limited to this. Based on the information of the terminals located in the IMS network 3 stored in the HSS 43, it may be determined whether or not the receiving terminal 9 is a 3G terminal located in the 3G area.

  In the above embodiment, control for providing voice guidance to a calling terminal has been described as an example of incoming service control. However, the present invention is not limited to this. The incoming service control includes a control for providing information based on the setting and status of the transmission terminal to the transmission terminal through a circuit switching network. For example, the incoming service includes control for transmitting a ringback tone according to the situation of the incoming terminal to the outgoing terminal and providing video guidance to the incoming terminal.

It is a figure which shows the structure of the communication network containing 3G network and IMS network which concern on this embodiment. It is a figure which shows the structure for the incoming service control between the IMS networks which concern on this embodiment. It is a figure which shows the structure of the communication system which concerns on this embodiment. It is a figure which shows the structure of O-AS and HLR which concern on this embodiment. It is a flowchart which shows operation | movement of the communication system which concerns on this embodiment. It is a sequence diagram which shows the operation | movement which performs incoming service control when the incoming terminal is located in the 3G terminal and 3G network in the communication system which concerns on this embodiment. It is a sequence diagram which shows the operation | movement which performs receiving service control when the receiving terminal exists in the 3G terminal and IMS network in the communication system which concerns on this embodiment. It is a figure which shows the structure of the communication system which concerns on a comparative example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS N ... Communication network, S ... Communication system, 1 ... 3G network (2nd mobile communication network), 3 ... IMS network (1st mobile communication network), 8 ... Originating terminal, 9 ... Incoming terminal, 12 ... MSC (second control means), 23 ... HLR (storage means), 31 ... CSCF (acceptance means), 33 ... O-AS (addition control means), 44 ... CS-AS (first control means), 62 ... A location determination control unit (determination means).

Claims (4)

A first mobile communication network in which first control means for performing incoming service control for providing information based on the status of the incoming terminal to the outgoing terminal is provided in the visited network of the incoming terminal and the incoming service control. A communication system in a communication network connected to a second mobile communication network in which second control means for performing in a visited network of the calling terminal is arranged,
A storage for storing information on special mobile terminals located in the second mobile communication network, located in the second mobile communication network, and having a system based on the architecture of the second mobile communication network Means,
An accepting unit that is arranged in the first mobile communication network and accepts an outgoing call request including information specifying the incoming terminal from the outgoing terminal that is the special mobile terminal;
Determining means for determining whether the receiving terminal specified by the information included in the call request is the special mobile terminal based on the information stored by the storage means;
An additional control means arranged in a visited network of the calling terminal in the first mobile communication network and performing the incoming service control;
With
The additional control means performs the incoming service control when the determining means determines that the receiving terminal is the special mobile terminal,
The communication system according to claim 1, wherein the first control unit performs the incoming service control when the determining unit determines that the receiving terminal is not the special mobile terminal.   The communication system according to claim 1, wherein the incoming service control is control for transmitting voice guidance as information based on a situation of the incoming terminal to the outgoing terminal. A first mobile communication network in which first control means for performing incoming service control for providing information based on the status of the incoming terminal to the outgoing terminal is provided in the visited network of the incoming terminal and the incoming service control. A communication method in a communication network connected to a second mobile communication network in which second control means for performing in a visited network of the calling terminal is arranged,
Information of a special mobile terminal having a system in which the storage means arranged in the second mobile communication network is located in the second mobile communication network and is based on the architecture of the second mobile communication network In the state of storing
An accepting step, wherein the accepting means arranged in the first mobile communication network accepts an outgoing call request including information specifying the incoming call terminal from the outgoing call terminal which is the first mobile terminal;
A determining step for determining whether the receiving terminal specified by the information included in the call request is the special mobile terminal based on the information stored by the storing unit;
When the additional control means arranged in the visited network of the calling terminal in the first mobile communication network determines that the receiving terminal is the special mobile terminal in the determining step, the incoming service control An additional control step for performing
A basic control step for performing the incoming service control when the first control means determines that the receiving terminal is not the special mobile terminal in the determining step;
A communication method comprising:   The communication method according to claim 3, wherein the incoming service control is control for transmitting voice guidance as information based on a situation of the incoming terminal to the outgoing terminal.

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