JP2008219268A - Mobile communication system, terminating terminal selecting device and call/session control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication system or the like capable of properly selecting a domain and a terminal in a mobile communication system in which a terminating terminal selection server and a domain selection server are respectively arranged. <P>SOLUTION: In the mobile communication system having communication domains of both a circuit exchange network and a packet exchange network, a CSCF (Call Session Control Function) 30/MSC (Mobile Services Switching Center) 40 for controlling a call connection and a session connection between communication terminals, the terminating terminal selection server 10 and the domain selection server 20 are arranged, and when a terminal generates a session, the terminating terminal selection server 10 selects through which communication domain a terminal selected as a terminating destination is connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile communication system having communication domains of both a circuit switched network and a packet switched network.

  In recent years, with the diversification of mobile communication networks, the forms of terminals connected to the networks have also diversified. A user owns and uses a plurality of terminals corresponding to diversified mobile communication networks. A user who owns a plurality of terminals can use different terminals according to his / her preferences and terminal capabilities, such as a terminal used for voice service and a terminal used for data communication service.

  Usually, a mobile communication network consists of a network that uses circuit switching and a network that uses packet switching. When a mobile communication terminal sets up a call / session, it connects to either or both networks. Then, a route for setting a call / session is provided (for example, see Patent Document 1).

  For example, FIG. 9 shows an outline of a conventional mobile communication network. In FIG. 9, a first terminal 60a and a second terminal 60b are connected to a packet switching domain and a circuit switching domain via wireless access means, respectively. Here, since the circuit-switched network and the packet-switched network coexist side by side, the entire networks are referred to as a circuit-switched domain and a packet-switched domain for distinction.

  A call from a circuit switching domain of a terminal is received as a call signal of the circuit switching call from the circuit switching domain on the calling side via the circuit switching domain connected to the other communication terminal. A call from the packet switching domain of the terminal also arrives via the packet switching domain as a call signal for the packet switching call. In addition, when communication is performed via the packet switching domain and the circuit switching domain, communication is performed via the GW. For example, when the first terminal 60a is connected to the packet switching domain and the second terminal 60b is connected to the circuit switching domain, communication between the terminals is performed via the GW 96.

  Here, a session control device is generally arranged in each domain. The session control device controls calls / sessions between communication terminals. A CSCF (Call Session Control Function) functions as a session control device in a packet switching domain, and a MSC (Mobile Services Switching Center) functions as a session control device in a circuit switching domain.

  Here, when receiving a call, it becomes a problem which terminal should receive a call from among a plurality of terminals owned by the user and a session should be set. Therefore, a mobile communication network includes a receiving terminal selection server that selects a receiving communication terminal to receive a call and set a session from a plurality of communication terminals.

  As a function of the receiving terminal selection server, when a user owns a plurality of communication terminals, the priority of which one of the plurality of communication terminals accepts an incoming call / session is managed. Then, a communication terminal having a high priority is selected as the destination terminal. The priority of the communication terminal is specified by the user according to the preference of the terminal that the user wants to use.

  In addition, the receiving terminal selection server may set the priority according to the type of service to be received in consideration of the capability of the access means of each of the plurality of communication terminals. For example, in the case of a large-capacity data communication service, priority is given to a terminal having an access means with a high data transmission capability, and in the case of voice service, priority is given to a terminal having an access means suitable for high-speed movement.

  Here, an outline of the receiving terminal selection server will be described with reference to FIG. In FIG. 10, first, a call request signal designating the first terminal 60a to the third terminal 60c as a call destination terminal is transmitted to the CSCF 85 (procedure 1). The CSCF 85 inquires the called terminal selection server 80 about the call destination terminal (procedure 2). Here, the receiving terminal selection server 80 determines that the third terminal 60c is a terminal owned by the same user as the second terminal 60b (hereinafter, the terminal owned by the same user is referred to as “ Device group)).

  Then, the receiving terminal selection server 80 determines a terminal to be a call destination from the terminal group (here, referred to as the second terminal 60b), and notifies the CSCF 85 of the call destination terminal (procedure 3). The CSCF 85 makes a call to the second terminal 60b notified to the receiving terminal selection server 80, and generates a session between the first terminal 60a and the second terminal 60b (procedure 4).

  In addition, when setting up a call / session to a communication terminal, the mobile communication network selects whether to relay the circuit switching domain or the packet switching domain as the communication path from the calling side to the receiving side. There is a domain selection server.

  Conventionally, the circuit switching domain is mainly used for setting up a voice service call / session, and the packet switching domain is used for setting up a multimedia service call / session such as text or image data. However, in recent years, voice services are also provided in the packet switching domain, such as VoIP technology. Accordingly, the domain selection server of the mobile communication network can select whether the setting is made via the circuit switching domain or the packet switching domain depending on the load state of the network.

  For example, when a terminal makes a call from a circuit switching domain, and the domain selection server selects the packet switching domain as a communication path, it passes through a gateway (GW) that interconnects the circuit switching domain and the packet switching domain. The circuit-switched call signal is converted into a packet-switched call signal. The terminal on the receiving side receives the call as a call signal for packet switching, and starts a session via the packet switching domain.

  The domain selection server can select a non-congested domain according to the domain congestion status (resource usage status, etc.).

  Here, an outline of the domain selection server will be described with reference to FIG. In FIG. 11, when the calling terminal (first terminal 60a) connects to the packet switching domain and makes a call by designating the telephone number of the receiving terminal, the CSCF 92 receives a call request signal (procedure 1). Then, before making a call to the receiving terminal (second terminal 60b), the domain selection server 90 is inquired about the domain through which the call / session is to be routed (procedure 2).

  Then, the domain selection server 90 selects a domain (circuit switching domain) as a route and notifies the CSCF 92 of the domain (procedure 3). When the CSCF 92 receives a notification for selecting a circuit switching domain from the domain selection server 90, the CSCF 92 makes a call request to the GW 96 (procedure 4).

  When the GW 96 receives the call request from the CSCF 92, the GW 96 transmits a call request signal to the MSC 94 which is a session control device in the circuit switching domain (procedure 5). When receiving the call request signal, the MSC 94 calls the second terminal 60b (procedure 6). In this way, when a call / session is set between the calling terminal (first terminal 60a) and the receiving terminal (second terminal 60b), the packet-switched call is transmitted by the GW 96 as indicated by the block arrow. It is converted into a circuit-switched call and arrives at the second terminal 60b.

The receiving terminal selection server 80 and the domain selection server 90 are application servers and servers that process circuit-switched calls and packet-switched calls, but are configured separately because of different purposes and operate independently. To do. The domain selection process in the domain selection server 90 is performed for all outgoing calls from the terminal. However, in the receiving terminal selection process in the receiving terminal selection server 80, the destination terminal is used by the user together with other terminals. For example, it is performed when a plurality of terminals are in a group state, and is not performed when the terminal is used alone.
JP 2006-80693 A

  When the above-described receiving terminal selection server and domain selection server coexist in the mobile communication network and operate respectively, the following problems occur.

  For example, although the domain selection server has selected a circuit switching domain, the receiving terminal selection server may select a terminal dedicated to packet switching, that is, a terminal that can connect only to the packet switching domain, as a destination. In this case, the selection results do not match and appropriate communication cannot be performed.

  In addition, the terminating terminal selection server has selected a terminal suitable for packet switching as the destination of the voice call, but the domain selection server may select to pass the voice call to the circuit switching domain. In this case as well, the selection results of both did not match, and appropriate communication could not be performed.

  In addition, the domain selection server selects a domain on the assumption that the receiving terminal is fixed, and the receiving terminal selection server depends on the type of call / session requested (circuit switching call or packet switching call). Without selecting the called terminal. Therefore, there is no problem when either one of the two functions operates independently, but when both functions operate in parallel, there is a problem that the other cannot be determined unless one of them is determined.

  Even if one of the domain selection processing by the domain selection server or the receiving terminal selection processing by the receiving terminal selection server is determined first and then the other is determined, the optimum selection result is not obtained. For example, even if the domain selection server selects a circuit switching domain to ensure call quality, etc., if the destination terminal selection server selects a terminal capable of high-speed packet transmission, transmission is performed to the terminal in the packet switching domain. May be able to provide a higher quality service, and the appropriate results may not have been selected.

  In view of such circumstances, an object of the present invention is to provide a mobile communication system that can appropriately select a domain and a terminal in a mobile communication system in which an incoming terminal selection server and a domain selection server are respectively arranged. It is to be.

  In view of the above-described problems, the mobile communication system according to the present invention includes a communication system having both a circuit switching network and a packet switching network. The mobile communication system controls call connection and session connection between communication terminals. A session control device; a domain selection device that determines which communication domain to connect to and notifies the call / session control device; a receiving terminal selection device that selects a terminal to be connected as a destination; A communication terminal connected via a communication domain, and the receiving terminal selection device has a domain selection means for indicating which communication domain the communication terminal selected as the destination is connected to Features.

  In the mobile communication system of the present invention, when the call / session control device receives a call / session connection request from a communication terminal, the call / session control device makes an inquiry from the call / session control device to the receiving terminal selection device, In the case where information indicating a domain selection result is included in the response from the receiving terminal selection device, an inquiry from the call / session control device to the domain selection device is omitted.

  In the mobile communication system of the present invention, when the call / session control device receives a call / session connection request from a communication terminal, the call / session control device makes an inquiry from the call / session control device to the receiving terminal selection device, Information indicating a domain selection result included in a response from the receiving terminal selection device is notified from the call / session control device to the domain selection device, and an inquiry about a communication domain is performed.

  Further, in the mobile communication system according to the present invention, the call / session control device may be any one of a domain selection result included in a response from the receiving terminal selection device and a domain selection result included in a response from the domain selection device. It is characterized in that a communication domain through which is selected is determined.

  In the mobile communication system according to the present invention, when the domain requested by the communication terminal on the calling side is the same as the domain selected by the destination terminal selection device, the domain included in the response from the destination terminal selection device The selection result is selected with priority over the domain selection result included in the response from the domain selection device.

  Further, the mobile communication system according to the present invention makes an inquiry to the domain selection device when the domain requested by the calling communication terminal is different from the domain selected by the receiving terminal selection device, and the domain selection The domain selection result included in the response from the apparatus is preferentially selected.

  Further, the mobile communication system according to the present invention makes an inquiry to the receiving terminal selection device and an inquiry to the domain selection device when the domain requested by the calling communication terminal is a circuit switching domain. When the domain requested by the calling communication terminal is a packet switching domain, only the inquiry to the receiving terminal selection device is performed, and the inquiry to the domain selection device is omitted.

  In the mobile communication system of the present invention, when the domain requested by the calling communication terminal is a packet switching domain, an inquiry to the receiving terminal selection device and an inquiry to the domain selection device are performed. When the domain requested by the calling communication terminal is a circuit switching domain, only the inquiry to the receiving terminal selection device is performed and the inquiry to the domain selection device is omitted.

  In addition, the receiving terminal selection device according to the present invention is characterized in that it has domain selection means for indicating through which communication domain the communication terminal selected as the destination is connected.

  In addition, when the call / session control device according to the present invention receives a call / session connection request from a communication terminal, the call / session control device makes an inquiry to the receiving terminal selection device and indicates a domain selection result in a response from the receiving terminal selection device When the information is included, the inquiry to the domain selection device is omitted.

  The call / session control device according to the present invention, when receiving a call / session connection request from a communication terminal, makes an inquiry to the receiving terminal selection device, and a domain selection result included in a response from the receiving terminal selection device Is sent to the domain selection device to inquire about the communication domain through which it passes.

  The call / session control device according to the present invention selects either a domain selection result included in a response from the receiving terminal selection device or a domain selection result included in a response from the domain selection device, It is characterized by determining a communication domain to be passed.

  The call / session control device according to the present invention is included in the response from the receiving terminal selection device when the domain requested by the calling communication terminal and the domain selected by the receiving terminal selection device are the same. The domain selection result to be selected is prioritized over the domain selection result included in the response from the domain selection device.

  Further, the call / session control device according to the present invention, when the domain requested by the calling communication terminal and the domain selected by the receiving terminal selection device are different, the domain selection included in the response from the domain selection device The result is selected with priority.

  The call / session control device according to the present invention makes an inquiry to the receiving terminal selection device and an inquiry to the domain selection device when the domain requested by the calling communication terminal is a circuit switching domain. When the domain requested by the calling communication terminal is a packet switching domain, only the inquiry to the receiving terminal selection device is performed, and the inquiry to the domain selection device is omitted.

  The call / session control device according to the present invention makes an inquiry to the receiving terminal selection device and an inquiry to the domain selection device when the domain requested by the calling communication terminal is a packet switching domain. When the domain requested by the calling communication terminal is a circuit switching domain, only the inquiry to the receiving terminal selection device is performed, and the inquiry to the domain selection device is omitted.

  According to the present invention, a domain selection server and a receiving terminal selection server can be arranged and coexist in a mobile communication system.

  In addition, by providing a means for substituting the domain selection device in the receiving terminal selection device, it is possible to notify the selection of the terminal and the domain preference of the selected terminal, and the domain selection processing in the domain selection device Can be complemented. Also, inquiries to the domain selection device can be skipped, control information is omitted, and the processing load on the system is reduced.

  Since the domain selection result does not affect the receiving terminal selection result, the user can set up a call / session with a communication terminal having a higher priority specified by the user or an appropriate communication terminal selected by the receiving terminal selection device. .

  First, a communication control system when the present invention is applied will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a communication control system. The communication control system includes a CSCF 30 (call / session control device) for controlling packet-switched calls / sessions, an MSC 40 (switch) for controlling circuit-switched calls / sessions, and a CSCF 30 and MSC 40 for controlling The application server includes an incoming terminal selection server 10 and a domain selection server 20.

  In addition, a GW 50 (gateway) that interconnects both domains is disposed. The terminal 60 communicates by connecting to the CSCF 30 or the MSC 40. In the communication control system of FIG. 1, a first terminal 60a, a second terminal 60b, and a third terminal 60c are arranged.

  Circuit-switched call data is transmitted by occupying the line on the route set by the MSC 40, and packet-switched call data is transmitted as a packet on the route set by the CSCF 30. For transmission, a circuit-switched call and a packet-switched call are converted in the GW 50, and data is transmitted / received via the GW 50.

  Further, the terminal 60 is connected to both domains or one of the domains. In FIG. 1, the first terminal 60a and the second terminal 60b are connected to both domains. The third terminal 60c is a telephone terminal dedicated to circuit switching, for example, and is connected only to the circuit switching domain. In the present embodiment, the second terminal 60b and the third terminal 60c are terminals (terminal groups) owned by the same user or the like.

  Here, when one user owns a plurality of terminals, the receiving terminal selection server 10 manages the plurality of terminals as a terminal group of the user and manages the incoming call priority. In the case of FIG. 1, it is managed that the second terminal 60b and the third terminal 60c are terminal groups.

  When CSCF 30 or MSC 40 receives a call to a terminal group (or any of the terminals included in the group), it makes an inquiry to the receiving terminal selection server 10, and the receiving terminal selection server 10 selects the terminal that is the destination of the call in the group. A selection is made from among them, and the selection result is returned to the CSCF 30 or the MSC 40 that made the inquiry.

  Here, FIG. 2 shows a functional configuration diagram of the receiving terminal selection server 10 and the domain selection server 20. As shown in FIG. 2, the receiving terminal selection server 10 includes a priority storage unit 102, a terminal selection unit 104, and a terminal group management unit 106. The domain selection server 20 includes a policy storage unit 202, a domain selection unit 204, and a domain state management unit 206.

  The priority storage unit 102 is an area for storing a terminal selection condition table (selection condition table) used when the incoming terminal selection server 10 selects an incoming terminal. The information in the table is stored and managed, for example, by receiving in advance notification of the incoming call priority of the terminal 60 included in the group from the user.

  An example of the data structure of the selection condition table is shown in FIG. In the selection condition table, priorities are stored in association with terminals in a group and call / session types (call type). For example, if the user who owns the second terminal 60b and the third terminal 60c wants to always carry the third terminal 60c and set the voice telephone session to be preferentially received by the third terminal 60c, The priority of “telephone” of the terminal 60c is increased.

  Further, since the second terminal 60b is a terminal having a large screen size such as a personal computer, when the user wants to use the second terminal 60b for making / receiving a videophone call, the “videophone” of the second terminal 60b is used instead of the third terminal 60c. ”. As described above, this is a table for storing the priority in consideration of the type of call / session (telephone, videophone, etc.), the type and capability of the terminal, the use cost, and the like.

  The priority may be set in the selection condition table by the user, or the receiving terminal selection server 10 substitutes the notification from the user, and the types and capabilities of the terminals included in the terminal group. From the above, table information may be set according to the type of call / session.

  The terminal selection unit 104 is a functional unit that selects a receiving terminal in accordance with the priority stored in the priority storage unit, selects which terminal to receive a call from the terminal group, and sets the destination address of the terminal. Responds to the session controller.

  The terminal group management unit 106 is a functional unit that manages a plurality of terminals owned by a user as a terminal group. For example, in the case of FIG. 1, the second terminal 60b and the third terminal 60c are managed as a terminal group, and in addition to the telephone numbers and addresses of the second terminal 60b and the third terminal 60c, the terminals are dedicated for circuit switching. It is possible to connect a terminal such as whether it is a voice telephone terminal or a packet exchange personal computer, and manage the available domains together. In addition, when the user carries only the second terminal 60b and the third terminal 60c is not near the user, there are times when the user can use all the terminals of the terminal group, and there are times when only a part can be used. Depending on the state of such a user, the terminals available at that time are managed from the terminal group.

  Here, the incoming call to the terminal 60 included in the terminal group may be a circuit-switched call or a packet-switched call, but this difference does not matter when the terminal 60 is selected. For example, in a terminal group, there is a voice telephone terminal dedicated to circuit switching that is always used by a user. In the case of a telephone, if the voice terminal is set to have priority, the call on the calling side is a packet switched call. Even if there is a call, the receiving terminal selection server 10 selects a voice telephone terminal dedicated for circuit switching as the receiving destination if it is a telephone service. In this case, the packet switching call is converted into a circuit switching call by the GW 50, and the session control device (CSCF or MSC) controls to receive the voice terminal via the circuit switching domain.

  In addition, there is a packet switching dedicated terminal such as a personal computer in the terminal group, but since the user is sitting in front of the personal computer, the personal computer may be given priority as a destination of incoming calls. In this case, the receiving terminal selection server 10 selects a personal computer as a destination even for a circuit-switched telephone, converts the circuit-switched call into a packet-switched call by the GW, and arrives at the personal computer via the packet-switched domain. The session control device (CSCF or MSC) controls.

  When the receiving terminal selection server 10 that has selected the receiving terminal responds to the CSCF 30 or the MSC 40 as the session control device with the selection result, the selected terminal is suitable for receiving a circuit-switched call or receives a packet-switched call. Include information on whether it is suitable to do as domain preference information. This information is used by the domain selection server 20 during the domain selection process.

  Next, the domain selection server 20 will be described. First, the policy storage unit 202 sets a selection policy for using a circuit switching domain or a packet switching domain from the viewpoint of ensuring communication quality when setting a call / session for a terminal and its counterpart terminal. It is a functional part to memorize.

  The domain selection unit 204 is a functional unit that selects a domain for setting a call / session in the terminal and notifies the session control apparatus of route information to the selected domain.

  The domain state management unit 206 is a functional unit that manages the state of the domain. For example, it manages the state (resource) of each domain, such as whether each domain is congested (whether it is in a congested state).

  The terminal 60 is connected to both or one of the circuit switching domain and the packet switching domain. When the calling terminal originates a call from the circuit switching domain or the packet switching domain, the session control device of the calling domain inquires of the domain selection server about the domain via the call.

  Here, the processing of the domain selection server will be described using the flow of FIG. First, when a domain inquiry is received from the session control device, the call type is determined as to whether the caller is calling with a circuit-switched call or a packet-switched call. It is confirmed to which domain the terminal is connected (step S100).

  Subsequently, the resource state of the domain corresponding to the call type is confirmed (step S102). For example, if the circuit-switched domain resource is insufficient compared to the packet-switched domain resource, the packet-switched domain is selected so as to pass through the packet-switched domain even for a circuit-switched call.

  Further, as a domain selection policy, there is a case where a circuit switching domain is preferentially selected for the purpose of guaranteeing QoS, or a case where a packet switching domain is selected so as to set a variable bit rate by flexibly controlling a band.

  The state of the call / session route set as a result of the domain selection will be described with reference to FIG. For example, when the domain selection server 20 selects a circuit switching domain for a circuit switching call from a calling terminal (first terminal) to a receiving terminal (second terminal), a call / session via the circuit switching domain is made. It is set (FIG. 5 (1)).

  In addition, when the domain selection server 20 selects a packet switching domain for a circuit-switched call from a calling terminal (first terminal) to a receiving terminal (second terminal), the GW 50 interconnects the domains. Through the packet switching domain (FIG. 5 (2)). As in this example, in the case of a route across domains, the domain selection server includes the route information to the selected domain in the response of the domain selection result to the session control device.

  Here, the domain selection server 20 considers the preference information of the domain notified from the receiving terminal selection server 10 at the time of domain selection. For example, if the destination terminal indicates a preference suitable for circuit switching, the domain selection server 20 selects the circuit switching domain in consideration thereof.

  On the other hand, even if the destination terminal domain preference is circuit switching, if resources cannot be secured due to the resource occupancy status of the circuit switching domain, the packet switching domain is selected by giving priority to the domain status. And set up a session. In such a case, at the time of making a call to the receiving terminal and setting a session, it is notified that it is provided as a packet-switched call because it cannot be provided by circuit switching.

  Further, even in such a case, a relay domain for relaying a call may be interposed in the destination domain so as to give priority to the domain preference of the receiving terminal. For example, if the domain preference of the terminating terminal is a circuit switched domain, the terminating domain selects the circuit switched domain according to the domain preference, but the circuit switched domain is congested and a predetermined resource is used in some sections. Is not secured, the packet switching domain is selected as the intermediate relay domain (FIG. 5 (3)).

  This example is also applied when the domain preference information is not notified from the receiving terminal selection server 10. When the destination domain preference is not notified, the domain selection server 20 prioritizes the domain state and domain policy to select the relay domain, and the destination terminal selection server 10 selects the destination domain. Select the connection domain of the selected device.

  When the CSCF 30 or the MSC 40, which is a session control device, receives a call request that designates either a terminal group or a terminal group as a call destination from the call terminal, the CSCF 30 or the MSC 40 inquires the call destination terminal selection server 10 about the call destination terminal in the group. . Further, the domain selection server 20 is inquired about the domain through the call / session. Then, a call / session is set according to the destination terminal selection and the domain selection result.

  The response to the inquiry to the destination terminal selection server 10 indicates the preference information of the domain along with the terminal selection result. When the CSCF 30 or the MSC 40 inquires about the domain from the domain selection server, the terminal selection result, Notify the domain preference of the selected terminal.

  Further, depending on the preference of the domain, the CSCF 30 or the MSC 40 which is a session control device skips the domain inquiry to the domain selection server. For example, when the preference of the domain notified by the receiving terminal selection server 10 is the same as the domain that the calling terminal makes a call request, that is, when making a call / session without crossing the domain, the CSCF 30 or The MSC 40 skips the inquiry to the domain selection server 20 and makes a call to the selected terminal 60 according to the domain preference of the terminal 60. In this case, it means that the receiving terminal selection server 10 substitutes the function of the domain selection server 20 and performs processing including domain selection.

  As described above, in the case where the domain of the calling terminal and the domain of the receiving terminal selected by the receiving terminal selection server 10 have the same preference, session control is performed for the purpose of omitting the processing procedure until the incoming call. The apparatus may skip the inquiry, or may execute the inquiry to the domain selection server 20 without skipping for the purpose of determining the domain in consideration of the domain state and the like.

  Further, more simply, when the first call request of the calling terminal is a packet-switched call, the inquiry to the domain selection server is always skipped, and when it is a circuit-switched call, The domain selection server may always be inquired about the domain.

  In other words, in the case of a circuit-switched domain, considering that there is a possibility of being affected by the occupancy status (congestion status) of circuit resources, it is often selected to relay to the packet-switched domain when selecting a domain. As a premise, the inquiry to the destination terminal selection server 10 is inquired to the domain selection server 20 only for a circuit-switched call. On the other hand, regarding the origination of the packet exchange call, only the inquiry to the receiving terminal selection server 10 may be performed and the inquiry to the domain selection server 20 may be skipped.

  Contrary to the above, for the purpose of guaranteeing QoS, when a call is requested in a packet-switched call and a resource is reserved and provided as a circuit-switched call, after selecting the receiving terminal for the packet-switched call, Alternatively, a circuit switching domain may be designated as a domain preference when making an inquiry to the domain selection server 20, and the circuit switching domain may be selected during domain selection processing.

  For a circuit-switched call, a communication terminal suitable for the circuit-switched call is selected when the called terminal is selected, the inquiry from the MSC to the domain selection server is skipped, and the circuit-switched domain is called as the called domain. To do.

  Whether the inquiry to the domain selection server should be inquired or to be skipped may be determined by the carrier's policy. For all outgoing calls, the session control device may always make an inquiry to the domain selection server. When priority is given to the simplification of the processing procedure up to this point, skip may be determined based on the type of call / session, the balance with domain preferences, the capability of the domain to be provided, and the like.

[First operation example]
Subsequently, the operation of the communication control system will be described with reference to the drawings. FIG. 6 shows a control procedure by taking as an example a case where the first terminal 60a makes a packet exchange call to the terminal group of the second terminal 60b and the third terminal 60c. The third terminal 60c is a telephone terminal that uses the circuit switching method that is owned by the same user as the second terminal 60b and that has a high voice call priority. The second terminal 60b is a terminal such as a mobile phone capable of high-speed packet transmission processing.

  First, when a call request for a voice call to the second terminal 60b is made from the first terminal 60a to the CSCF 30 (procedure 1), the CSCF 30 inquires of the receiving terminal selection server 10 about a terminal for receiving the call request ( Procedure 2). The call is a packet-switched voice call made by the first terminal 60a connected to the packet-switched domain.

  The receiving terminal selection server 10 selects the third terminal 60c having a high incoming priority for voice calls in the terminal group (procedure 3), and responds to the CSCF 30 with the destination address of the selected third terminal 60c. Further, the third terminal 60c is a terminal dedicated to circuit switching and selects the information indicating that the user prefers the circuit switching call as the type of the voice call, that is, the domain preference is the circuit switching domain. The CSCF 30 is notified together with the response of the result (procedure 4).

  The CSCF 30 inquires of the domain selection server 20 about the domain to relay the call to the third terminal 60c (procedure 5). This inquiry includes information indicating that the destination address of the third terminal 60c and the domain preference of the third terminal 60c are the circuit switching domain.

  The domain selection server 20 confirms that the domain preference is circuit switching, further considers the resource status of circuit switching traffic, determines that it is possible to go to the circuit switching domain, and selects the circuit switching domain. (Procedure 6). Then, the selection result is returned to the CSCF 30 (procedure 7). This response includes route information to the circuit switching domain.

  Even if the notified domain preference is circuit switching, the domain selection server may select a packet switching domain depending on the resource status of the circuit switching domain. In that case, it responds to the CSCF 30 including the route information to the packet switching domain.

  In this case, the first call is a packet-switched call, but since it is converted to a circuit-switched call via the circuit-switched domain, it becomes a route that relays the GW 50 for interconnection, and the CSCF 30 is in accordance with the route information. MSC 40 is requested to make a call to third terminal 60c via GW 50 (procedures 8 and 9).

  The MSC 40 makes a call to the third terminal 60c (procedure 10), and when the third terminal 40c responds, a voice call session is set up via the packet switching domain and the circuit switching domain.

  As in this case, if the domain preference of the called terminal notified by the called terminal selection server 10 is different from the domain called by the calling party (need to call across domains via the interconnected GW 50) If there is, the CSCF 30 determines to make an inquiry to the domain selection server for the purpose of obtaining route information.

[Second operation example]
Next, the operation when there is a videophone call request will be described with reference to FIG.

  When there is a videophone call request to the second terminal 60b from the first terminal 60a to the CSCF 30 (procedure 1), the CSCF 30 inquires the terminal that receives the call request to the receiving terminal selection server 10 (procedure 2). . The call is a packet-switched call made by the first terminal 60a connected to the packet-switched domain.

  The destination terminal selection server 10 selects the second terminal 60b having an access means capable of high-speed packet transmission processing as the destination of the videophone call (procedure 3), and the second terminal 60b likes the packet-switched call. That is, the terminal selection result is returned to the CSCF 30 together with information indicating that the domain preference is the packet switching domain (procedure 4). Here, since the selected terminal is the same as the second terminal 60b designated by the calling terminal, the destination address of the second terminal 60b may not be included in this response.

  The CSCF 30 receives the terminal selection result and domain preference information, and the domain preference notified by the destination terminal selection server is the packet switching domain, and is the same as the domain specified by the calling party (not across domains). Therefore, the CSCF 30 determines to skip the inquiry to the domain selection server (procedure 5).

  Then, the procedure for inquiring to the domain selection server is skipped, and a packet exchange call is made to the third terminal 60c (step 6).

[Third operation example]
In addition, as another control procedure of the present invention, an operation when domain preference information is not notified from the receiving terminal selection server 10 will be described with reference to FIG.

  When there is a call request for a voice call to the second terminal 60b from the first terminal 60a to the CSCF 30 (procedure 1), the CSCF 30 inquires the terminal that receives the call request to the receiving terminal selection server 10 (procedure 2). . The call is a packet-switched voice call made by the first terminal 60a connected to the packet-switched domain.

  The receiving terminal selection server 10 selects the third terminal 60c having a high incoming priority for voice calls (procedure 3), and notifies the destination address of the selected third terminal 60c (procedure 4). Here, although the third terminal 60c is a voice terminal dedicated to circuit switching, the information indicating that the domain preference is the circuit switching domain is not included in the selection result and responds to the CSCF 30.

  The CSCF 30 confirms that the domain preference is not included in the response, determines that an inquiry to the domain selection server 20 is necessary (procedure 5), and sends the domain selection server 20 to the third terminal 60c. Queries the domain through which the call is made (procedure 6). This inquiry includes the destination address of the third terminal 60c.

  The domain selection server 20 confirms whether the third terminal 60c is connected to the packet switching domain because the call is a packet switching call.

  Then, when it is confirmed that the third terminal 60c is not connected to the packet switching domain but connected to the circuit switching domain, it is possible to pass through the circuit switching domain in consideration of the resource status of the circuit switching domain. Judgment is made and a circuit switching domain is selected (step 7). Then, the selection result is returned to the CSCF 30 (procedure 8). This response includes route information to the circuit switching domain.

  In this operation example, the first call is a packet-switched call, but since it is converted to a circuit-switched call via a circuit-switched domain, it becomes a route that relays the GW 50 for interconnection, and the CSCF 30 A call to the third terminal 60c is requested to the MSC 40 in the exchange domain via the GW (procedures 9, 10, and 11).

  When the MSC 40 makes a call to the third terminal 60 c and the third terminal 60 c responds, a voice call session is set up between the packet switching domain and the circuit switching domain via the GW 50.

  If the destination terminal selection server 10 does not notify the domain preference of the destination terminal as in this case, the CSCF 30 makes an inquiry to the domain selection server for the purpose of obtaining information on the relay route.

  Even if the calling domain is a circuit switching domain and the incoming domain selected by the domain selection server is also called circuit switching, the domain selection server may further switch packets as a relay domain depending on the resource status of the domain. May choose a domain. In that case, as a selection result, route information received in the circuit switching domain after relaying to the packet switching domain is returned to the session control apparatus. As a result, a circuit-switched call is relayed from the circuit-switched domain to the packet-switched domain, and further arrives via the circuit-switched domain on the receiving side.

  Note that the mobile communication system of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

It is a figure which shows the outline of a communication control system. It is a figure which shows the structure of a receiving terminal selection server and a domain selection server. It is a figure which shows an example of the data structure of a selection condition table. The figure which shows the operation | movement flow of a communication control system. The figure for demonstrating the form of domain selection. The figure for demonstrating the process of a communication control system. The figure for demonstrating the process of a communication control system. The figure for demonstrating the process of a communication control system. The figure for demonstrating the conventional communication control system. The figure for demonstrating the conventional communication control system. The figure for demonstrating the conventional communication control system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Incoming terminal selection server 102 Priority storage part 104 Terminal selection part 106 Terminal group management part 20 Domain selection server 202 Policy storage part 204 Domain selection part 206 Domain state management part 30 CSCF
40 MSC
50 GW
60a 1st terminal 60b 2nd terminal 60c 3rd terminal

Claims (16)

A mobile communication system having communication domains of both a circuit switched network and a packet switched network
A call / session control device for controlling call connection and session connection between communication terminals;
A domain selection device that determines which communication domain to connect to and notifies the call / session control device;
An incoming terminal selection device for selecting a terminal to be connected as a destination;
A communication terminal connected via the communication domain;
With
2. The mobile communication system according to claim 1, wherein the receiving terminal selection device includes a domain selection unit that indicates a communication domain through which a communication terminal selected as a destination is connected.   When the call / session control device receives a call / session connection request from a communication terminal, the call / session control device makes an inquiry to the receiving terminal selection device from the call / session control device, and selects a domain as a response from the receiving terminal selection device 2. The mobile communication system according to claim 1, wherein an inquiry from the call / session control device to the domain selection device is omitted when information indicating a result is included.   When the call / session control device receives a call / session connection request from a communication terminal, the call / session control device makes an inquiry to the receiving terminal selection device from the call / session control device, and is included in a response from the receiving terminal selection device 2. The mobile communication system according to claim 1, wherein information indicating a domain selection result is notified from the call / session control device to the domain selection device, and an inquiry about a communication domain is performed.   The call / session control device selects a communication domain through which a domain selection result included in a response from the receiving terminal selection device and a domain selection result included in a response from the domain selection device are routed. The mobile communication system according to claim 2, wherein the mobile communication system is determined.   When the domain requested by the calling communication terminal and the domain selected by the receiving terminal selection device are the same, the domain selection result included in the response from the receiving terminal selection device is the response from the domain selection device. The mobile communication system according to claim 4, wherein the selection is performed with priority over the domain selection result included in the mobile communication system.   When the domain requested by the calling communication terminal is different from the domain selected by the receiving terminal selection device, the domain selection result is inquired to the domain selection device and included in the response from the domain selection device The mobile communication system according to claim 4, wherein the mobile communication system is selected with priority.   If the domain requested by the calling communication terminal is a circuit switching domain, the inquiry to the receiving terminal selection device and the inquiry to the domain selection device are performed, and the domain requested by the calling communication terminal 2. The mobile communication system according to claim 1, wherein when the packet switching domain is a packet switching domain, only an inquiry to the destination terminal selection device is performed and an inquiry to the domain selection device is omitted.   When the domain requested by the calling communication terminal is a packet switching domain, the inquiry to the receiving terminal selection device and the inquiry to the domain selection device are performed, and the domain requested by the calling communication terminal 2. The mobile communication system according to claim 1, wherein, in the case of a circuit-switched domain, only an inquiry to the receiving terminal selection device is performed and an inquiry to the domain selection device is omitted. A receiving terminal selection device in a mobile communication system according to claim 1,
An incoming terminal selection apparatus comprising domain selection means for indicating through which communication domain a communication terminal selected as a destination is connected. A call / session control device in a mobile communication system according to claim 1,
When a call / session connection request from a communication terminal is received, an inquiry is made to the receiving terminal selection device, and when the response from the receiving terminal selection device includes information indicating a domain selection result, the domain selection device Call / session control device characterized by omitting inquiry to   Upon receiving a call / session connection request from a communication terminal, it makes an inquiry to the receiving terminal selection device, and notifies the domain selection device of information indicating a domain selection result included in a response from the receiving terminal selection device. 11. The call / session control device according to claim 10, wherein the call / session control device makes an inquiry about a communication domain through which the call passes.   Selecting one of a domain selection result included in a response from the receiving terminal selection device and a domain selection result included in a response from the domain selection device, and determining a communication domain to pass through. The call / session control device according to claim 10.   When the domain requested by the calling communication terminal and the domain selected by the receiving terminal selection device are the same, the domain selection result included in the response from the receiving terminal selection device is the response from the domain selection device. 13. The call / session control device according to claim 12, wherein the selection is performed with priority over the domain selection result included in.   When the domain requested by the calling communication terminal is different from the domain selected by the receiving terminal selection device, the domain selection result included in the response from the domain selection device is preferentially selected. The call / session control device according to claim 12.   When the domain requested by the calling communication terminal is a circuit switching domain, an inquiry to the receiving terminal selection device and an inquiry to the domain selection device are performed, and the domain requested by the calling communication terminal is a packet 11. The call / session control device according to claim 10, wherein in the case of an exchange domain, only the inquiry to the destination terminal selection device is made, and the inquiry to the domain selection device is omitted.   If the domain requested by the calling communication terminal is a packet switching domain, the inquiry to the receiving terminal selection device and the inquiry to the domain selection device are performed, and the domain requested by the calling communication terminal 11. The call / session control device according to claim 10, wherein only the inquiry to the receiving terminal selection device is made and the inquiry to the domain selection device is omitted when the is a circuit switching domain.

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