JP2016144187A - Communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system capable of surely providing an interruption call incoming service corresponding to an ON/OFF setting state of interruption call incoming when the interruption call incoming is received at a communication terminal device comprising 4G and 3G voice communication functions.SOLUTION: When a communication terminal device receives interruption call incoming while being located within an area of a 4G mobile communication network, the communication terminal device controls a user notification of the interruption call incoming on the basis of ON/OFF setting information and when the communication terminal device receives interruption call incoming while being located within an area of a 3G mobile communication network, the communication terminal device performs a user notification of the interruption call incoming. When a server receives interruption call incoming to a communication terminal device that is located within the area of the 4G mobile communication network, the server transfers the interruption call incoming to the communication terminal regardless of ON/OFF setting information being stored in the server. When the server receives interruption call incoming to a communication terminal device that is located within the area of the 3G mobile communication network, the server controls transfer of the interruption call incoming to the communication terminal device on the basis of the ON/OFF setting information being stored in the server.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a communication system including a communication terminal apparatus capable of communicating via a mobile communication network having a packet data network.

  Conventionally, a communication terminal device having a voice communication function via a packet data network is known (see, for example, Non-Patent Document 1). Voice communication over a packet data network is provided with a voice communication service using a communication technology compliant with the LTE (Long Term Evolution) standard, which is a fourth generation (4G) communication method. It is also called Voice over LTE.

  As an additional service for voice communication, an interrupt incoming service called “CW (communication waiting)” is known (see Non-Patent Document 2). In this interrupt incoming call service, when there is a second call interrupt incoming call from another communication terminal device during a call in which the first call is received from another communication terminal device, a call with the first call is made. This is an additional service that can be temporarily put on hold and can respond to a second call that is interrupted.

  A communication terminal device having a voice communication function via the packet data network may also have a voice communication function via a third generation (3G) mobile communication network (circuit switching network) at the same time.

  Even in a communication terminal device having a voice call function via both the 4G and 3G mobile communication networks, when a call is received from another communication terminal device during a call, the call is temporarily put on hold and the call is received. It is possible to use an interrupt incoming call service that responds. This interrupt incoming call service may have a different processing procedure depending on whether the communication terminal device is in a 3G cell or a 4G (LTE) cell. This is because the 3G communication system and the LTE communication system may have different methods of providing a call reception (CW: communication waiting) service.

  Provided an interrupt incoming service according to the ON / OFF setting of the incoming interrupt when the interrupt incoming call processing procedure differs depending on whether the communication terminal device is in the 3G cell or in the 4G (LTE) cell. There is a risk that it will not be possible.

  The present invention has been made in view of the above-described problems, and an object thereof is a communication terminal having both a voice communication function via a 4G mobile communication network and a voice communication function via a 3G mobile communication network. To provide a communication system capable of reliably providing an interrupt incoming service according to an ON / OFF setting state of an interrupt incoming call when the apparatus receives an incoming incoming call of a second call during a call with the first call. It is.

A communication system according to an aspect of the present invention includes a communication terminal device capable of communicating via a 4G mobile communication network having a packet data network and a 3G mobile communication network having a circuit switching network, and the communication terminal device. A network-side device provided in the mobile communication network to control voice communication, wherein the communication terminal device is a voice capable of making a call via a packet data network and a circuit switching network. Means for storing ON / OFF setting information for interrupt incoming of the second call during a call between the communication means and the first call; and ON / OFF setting information for interrupt incoming for the network side device When receiving an interrupt incoming call for a second call during a call that is in a wireless communication area with the 4G mobile communication network and is communicating with the first call, Stored in the communication terminal Means for controlling the user notification of the interruption incoming call of the second call based on the ON / OFF setting information of the incoming interruption incoming call and the first in the area where wireless communication with the 3G mobile communication network is possible Means for notifying the user of an incoming call interruption of the second call when receiving an incoming call interruption during a call in progress with the call; and Means for receiving incoming ON / OFF setting information from the communication terminal apparatus; means for storing ON / OFF setting information of incoming interrupt received from the communication terminal apparatus; and the communication terminal apparatus is 4G mobile communication When an incoming call for a second call to the communication terminal apparatus is received during a call that is in an area where wireless communication with the network is possible and is in communication with the first call, the call is stored in the network side apparatus. Said interrupt Means for transferring the incoming call interruption of the second call to the communication terminal device regardless of the ON / OFF setting information of the communication, and the communication terminal device is located in an area where wireless communication with the 3G mobile communication network is possible. When receiving a second call interruption incoming call to the communication terminal device during a call with the first call, the interruption incoming call ON / OFF setting information stored in the network side device And a means for controlling the transfer of the incoming call interruption of the second call to the communication terminal device.
In the communication system, the communication terminal device is located in an area where wireless communication with a 4G mobile communication network is possible and is making a call with the first call during a call. When received, the network side device includes a means for transmitting a call signal for the second call interruption arrival to the network side device, and thereafter transmitting a response signal for the communication terminal device of the second call, Means for determining that there has been an interrupt incoming call for the second call by receiving a call signal in response to an incoming call interrupt for the second call, and transmitting a signal indicating a session progress status to the communication terminal device for the second call; And a means for transferring the response signal received subsequent to the call signal to the communication terminal device for the second call after transmitting a signal indicating a session progress status.
Further, in the communication system, the communication terminal device is located in an area where wireless communication with a 4G mobile communication network is possible and interrupts the second call during a call with the first call. When the incoming call is received and the ON / OFF setting information for the incoming call is OFF, the user is not notified of the incoming call for the second call, and a response signal indicating that the call is in progress is sent. You may transmit to a terminal device.

  According to the present invention, in a communication terminal apparatus having both a voice communication function via a 4G mobile communication network and a voice communication function via a 3G mobile communication network, the second during a call with the first call. When receiving an incoming call interrupt, an interrupt incoming service according to the ON / OFF setting state of the incoming interrupt can be reliably provided.

Explanatory drawing which shows an example of schematic structure of the whole communication system which can communicate by the communication terminal device which concerns on embodiment of this invention. The block diagram which shows an example of schematic structure of the communication terminal device which concerns on this embodiment. The block diagram which shows an example of the file structure of UICC with which the communication terminal device of this embodiment is mounted | worn. The sequence diagram which shows an example of the process sequence from the time the power supply of the communication terminal device which concerns on this embodiment becomes ON until the voice communication of VoLTE via an IMS network is attained. The sequence diagram which shows an example of the process sequence when performing the voice transmission of VoLTE in the communication terminal device which concerns on this embodiment. When a communication terminal device whose interrupt incoming call setting information (CW setting information) is set to OFF receives a second call interrupt incoming call from another communication terminal device during a VoLTE call when the 4G (LTE) cell is in the service area The sequence diagram which shows an example of a process. When a communication terminal device whose interrupt incoming call setting information (CW setting information) is set to ON is in a 4G (LTE) cell area and receives a second incoming call from another communication terminal device during a call using VoLTE FIG. 8 is a sequence diagram showing an example of the process.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory diagram showing an example of a schematic configuration of an entire communication system that can perform a call (voice communication) and mail transmission / reception of various messages by the communication terminal device according to the embodiment of the present invention. In the communication system of this embodiment, a mail communication service such as a telephone service or mail transmission / reception can be used from a plurality of communication terminal apparatuses 10.

  The communication terminal device 10 of the present embodiment is a communication terminal device compatible with VoLTE that is voice communication via a packet data network on a mobile communication network compliant with LTE / LTE-Advanced, and is also a user device (UE). be called. The communication terminal device 10 of the present embodiment also has a call function via a circuit switching network on a 3G mobile communication network, and communicates with a communication terminal device not supporting VoLTE via the circuit switching network. You can make a call.

  The mobile communication network 20 corresponds to a radio access network (RAN) 210 including a base station, a radio network controller, and the like, and a 3G (third generation) radio communication system such as W-CDMA (Wideband Code Division Multiple Access). A core network 220 and a core network (EPC: Evolved Packet Core) 240 corresponding to the LTE / LTE-Advanced wireless communication system are provided. Further, the mobile communication network 20 includes a dedicated packet data network 230 and an IMS network 250 constructed in the mobile communication network 20 as a PDN (packet data network).

  Further, although not shown in FIG. 1, the mobile communication network 20 is a RADIUS (Remote Authentication Dial-in User Service) server or the like as a communication service use management device that manages the use of communication services by each user. A network side device is provided. The RADIUS server performs an authentication process for identifying a user of a communication service using the communication terminal device 10, a process for determining whether or not to provide a communication service to an authenticated user, and actual communication service usage information. Accounting to record.

  The radio access network 210 includes a base station (NodeB) 211 of a 3G radio communication system such as W-CDMA and a base station (eNodeB) 212 of an LTE / LTE-Advanced radio communication system. Each base station 211, 212 is provided for each cell subject to jurisdiction, converts data from a wired line in the mobile communication network 20 into a data format suitable for the radio interface, and is located within the cell subject to jurisdiction. It transmits to the communication terminal device 10 that is being transmitted at a predetermined radio frequency. Conversely, data from the communication terminal device 10 transmitted at a radio frequency is received, converted into a data format suitable for the wired interface, and transferred to the wired line portion in the mobile communication network 20.

  The 3G core network 220 includes a circuit switching network, a packet switching network, an HLR (home location register) 221 as a location registration management device, and a network side device such as an authentication center (not shown). Communication control is performed so as to relay the communication between them. Furthermore, the core network 220 performs communication control so as to relay communication between each communication terminal device 10 and the components in the mobile communication network 20. The core network 220 performs communication control so as to relay communication between each communication terminal apparatus 10 and another communication network.

  The packet switching network included in the 3G core network 220 includes nodes such as an SGSN (Serving GPRS Support Node) 222 and a GGSN (Gateway GPRS Support Node) 223. The SGSN 222 is a gateway function between an RNC (Radio Network Control Device) 215 to which the base station 211 is connected and a packet switching network on the core network 220 side, and location management, security management and access control of each communication terminal device 10. And a function of performing The GGSN 223 has a gateway function between the packet switching network on the core network 220 side and the dedicated packet data network 230.

  The circuit switching network included in the 3G core network 220 includes nodes such as an MSC (mobile switch) 224 and a GMSC (gateway MSC) 225. The exchange 224 has a VLR (location / location register) function for registering and managing location information of the communication terminal device 10 in a cell in which the communication terminal device 10 is located, a call control function, and a service control function. It also has an SSF (Service Exchange Function) function that executes a series of processes for interaction to be performed. In addition, voice communication with the external circuit-switched telephone network 60 can be performed via the gateway switch 225.

  The dedicated packet data network 230 includes various network side devices such as a proxy server 231, a gateway (GW) server 232, a WEB server 233, and a subscriber information database (not shown). The proxy server 231 relays communication between the communication terminal device 10 and various servers 71 such as a WEB server 233 provided in the dedicated packet data network 230 and various servers 71 such as a WEB server and a download server on the Internet 70. Perform the process. The proxy server 231 also has a protocol conversion function for matching both communication protocols when the communication protocol in the 3G core network 220 is different from the communication protocol in the dedicated packet data network 230 or the Internet 70. The gateway server 232 has a gateway function and a firewall function between the dedicated packet data network 230 in the mobile communication network 20 and the Internet 70.

  LTE core network (EPC) 240 includes HSS (home subscriber server) 241, MME (mobility management and entity) 242, SGW (serving gateway) 243, PGW (packet data network / gateway) 244, policy charging control. A network side device such as a PCRF (policy charging rule function) 245 which is a device is provided. The HSS 241 is a server that manages subscriber information and controls services. The MME 242 is a logical node that accommodates the base station (eNodeB) 212 and provides mobility control and the like. The SGW 243 is a visited packet gateway (located packet switch) that relays user data between the MME 242 and the PGW 244 and transfers user data to the 3G core network 220 side. The PGW 244 is a gateway that is installed at a connection point with the IMS network 250 and the Internet 70 and performs IP address assignment, packet transfer to the SGW 243, and the like. The PCRF 245 is a logical node that performs control for user data transfer QoS (communication service quality) and billing.

  The IMS network 250 is a packet data network capable of performing voice session control, and includes a P-CSCF (proxy-call / session / control function) 251, an S-CSCF (serving-call / session-control function) 252, I -Network side devices such as CSCF (inquiry / call / session / control function) 253, AS (application server) 254, XDM (XML document management) server 256, etc. The P-CSCF 251 is a SIP relay server installed at a connection point with the core network (EPC) 240, and has a function of starting QoS control in cooperation with the core network (EPC) 240 as well as transferring SIP signals. Have. The S-CSCF 252 is a SIP server that performs terminal session control and user authentication. The I-CSCF 253 is the first gateway SIP server to be connected from another external IMS network 80 at the time of interconnection / roaming, and has a function of identifying the S-CSCF 252 and a function of relaying signals. .

  The AS 254 is a server for providing a service such as IMS, and provides multimedia applications such as voice and video to each communication terminal device 10 based on subscriber identification information by user login registration. Also, the AS 254 is a means for receiving an IMS service registration cancellation request or registration request from the communication terminal device 10, a means for executing processing for canceling a user's usage registration based on the registration cancellation request, and a user based on the registration request. And a function for transmitting a registration cancellation completion response or a registration completion response including information indicating that the processing has been completed to the communication terminal device 10.

  The XDM server 256 is a server that stores and manages setting information used in various services provided by IMS as an XCAP document (XML document) for each communication terminal device or for each user. For example, the XDM server 256 turns ON the interrupt incoming call used for the VoLTE service provided by IMS and its additional service (for example, VoLTE outgoing / incoming call, incoming interrupt call, incoming call transfer) for each communication terminal device or for each user. / OFF setting information (CW setting information) is stored and managed as an XCAP document (XML document).

  In the communication system, a plurality of pieces of identification information for using a communication service using the communication terminal device 10 is registered and managed in a predetermined server or database. For example, IMSI (subscriber identifier), MSISDN (telephone number), IMEI (international mobile equipment) which are identification information for using communication services such as telephone calls, messages, mails, and Internet access in the mobile communication network 20 (Identifier: terminal identification information) and the like are registered and managed in an HLR (Home Location Register) 221 which is a subscriber information database. In addition, IMPU, IMPI, etc., which are identification information for using a communication service such as VoLTE in an IMS (IP Multimedia Subsystem) network, which is an IP network constructed on the mobile communication network 20, are included in the IMS. It is registered and managed in the HSS 241 which is a subscriber information management server. These HLR 221 and HSS 241 are configured to be able to communicate with the communication terminal apparatus 10 via the mobile communication network 20 by a predetermined communication protocol.

  Here, the IMPU is a uniquely identifiable identifier for routing the SIP message signal to the destination communication terminal device (IMS terminal) in the IMS network, and can be generated based on, for example, MSISDN (non-patent document). (Refer to Chapter 13 of Document 3). Further, the IMPI is a uniquely identifiable identifier used for identification of an IMS subscription contract and authentication at the time of access to the IMS, and can be generated based on, for example, IMSI (Non-Patent Document 3). See Chapter 13).

  The communication terminal device 10 can communicate with the HLR 221 via the base station (NodeB) 211 of the mobile communication network 20 and can communicate with the HSS 241 via the base station (eNodeB) 212. The communication terminal apparatus 10 includes communication services such as telephone, message, mail, and Internet access in the mobile communication network 20 such as 3G, 4G, and LTE (Long Term Evolution) (hereinafter referred to as “mobile communication service”). And an application program which is software for using a communication service such as VoLTE in the IMS network (hereinafter referred to as “IMS communication service”). Further, the communication terminal device 10 includes a UICC (Universal IC Card) 15 which is a general-purpose integrated IC card in which a plurality of pieces of identification information such as IMSI, MSISDN, IMEI, IMPU, and IMPI are stored. The UICC 15 also stores various data used in the communication service and an applet that is an individual program for performing predetermined operations and processing in the card. Note that the communication terminal device 10 of the present embodiment is configured so that the UICC can be attached and detached by the user's work, but the UICC may be incorporated inside so that the user cannot easily remove it. .

  The application program (hereinafter, abbreviated as “application” as appropriate) and applets can be downloaded from a server on the communication network and registered in the communication terminal device 10, and the user can select and execute them. can do. The application program and the applet are executed on an application execution environment such as JAVA (registered trademark) execution environment built in the communication terminal device 10.

  FIG. 2 is a block diagram illustrating an example of a hardware configuration of the communication terminal device 10 according to the present embodiment. The communication terminal device 10 includes a main control unit 110, a wireless communication unit 111, a baseband processing unit 112, a sound input / output unit 113, a display unit 114, and an operation unit 115 as an operation unit. In addition, the communication terminal apparatus 10 is equipped with a UICC 15 that can be attached to and detached from the apparatus main body. The UICC 15 incorporates a function as a USIM used in a mobile communication service and a function as an ISIM used in an IMS communication service.

  The main control unit 110 includes an MPU (micro processing unit), a RAM, a ROM, and the like, and controls each unit such as the baseband processing unit 112 by executing a program such as a predetermined basic OS or middleware. Or build a native platform environment or application execution environment on the software configuration.

  The wireless communication unit 111 functions as a network communication unit that communicates via the mobile communication network 20, and includes, for example, a synthesizer, a frequency converter, a high frequency amplifier, and the like, and includes a base station (NodeB) 211 of the mobile communication network 20 and High-frequency signal processing for wireless communication with the base station (eNodeB) 212 is executed.

  The baseband processing unit 112 performs digital processing for performing voice communication and data transmission / reception communication with communication terminal devices such as other mobile phones and various servers. The baseband processing unit 112 and the wireless communication unit 111 are connected via a D / A converter or an A / D converter.

  The sound input / output unit 113 includes a microphone, a speaker, a sound signal processing unit, and the like. The analog audio signal output from the microphone is converted into a digital signal by the sound signal processing unit and sent to the main control unit 110, the baseband processing unit 112, and the like. The speaker receives an analog signal converted from a digital signal by the sound signal processing unit, and outputs a voice during a call, or outputs a ringtone for a mail, a ringing tone for a telephone, music, or the like. The speaker may be configured by separately providing a receiver speaker (receiver) for listening to voice during a call and an external output speaker for outputting ringtones, music, etc. You may comprise with one speaker so that a speaker and an external output speaker may be combined.

  The display unit 114 is configured by an LCD (liquid crystal display) or the like, and displays various images based on commands from the main control unit 110. The operation unit 115 includes a touch panel incorporated in the display unit 114, various operation keys and buttons, a power switch as a power ON / OFF unit, and the like. This operation unit 115 is used when the user turns on / off the main body power supply of the communication terminal device 10, instructs a call start / end, menu selection, screen switching, etc., or inputs information. It is done.

  In addition, the communication terminal device 10 includes a GPS (global positioning system) unit 117 as a position information acquisition unit, a camera unit 118 as an imaging unit, a sensor unit 119, a power supply unit 120 as a power supply unit, a watch (not shown). The department etc. are also provided.

  The GPS unit 117 includes a GPS receiving module, a GPS antenna, and the like, receives radio waves from a plurality of GPS satellites arranged around the earth, and the latitude and longitude at which the communication terminal device 10 is located based on the reception result And altitude data. The camera unit 118 includes a lens, an imaging device, and the like, and is used when shooting a person, a landscape, and the like. As an imaging device, a CCD (Charge Coupled Device) camera or a CMOS camera can be used. The sensor unit 119 includes an acceleration sensor and / or a geomagnetic sensor. The acceleration sensor may be a uniaxial acceleration sensor or a multi-axis acceleration sensor such as a biaxial or triaxial acceleration sensor. Further, the geomagnetic sensor may be a uniaxial geomagnetic sensor, or may be a multiaxial geomagnetic sensor such as a biaxial or a triaxial. Based on the output of the sensor unit 119, data indicating the position, orientation, posture, and movement of the communication terminal device 10 can be calculated. Further, based on the output of the sensor unit 119, the communication terminal device 10 determines whether or not the communication terminal device 10 is based on history information that is information on temporal changes in acceleration data and geomagnetic data when the user's communication terminal device 10 moves from a reference position at a predetermined altitude. Data indicating the altitude, angle, and the like that are located can be calculated.

  The power supply unit 120 includes a rechargeable battery, a power supply circuit that supplies power of a predetermined voltage from the battery to each unit, a charging circuit that charges the battery, and the like. The power supply unit 120 also supplies power to the main part of the communication terminal device 10, that is, the sound input / output unit 113, the display unit 114, a part of the operation unit 115, the GPS unit 117, the camera unit 118, and the sensor unit 119. The above-described power switch that can be operated by the user can be turned ON / OFF. In order to operate some functions when the power switch is turned off, the power supply unit 120 continues to supply power to the wireless communication unit 111, the baseband processing unit 112, and the UICC 15 even when the power switch is turned off. It may be configured to do.

  The clock unit is configured by a clock circuit or the like, counts accurate date and time, and generates time information for various update processes, for example.

  FIG. 3 is a block diagram illustrating an example of a main configuration of the UICC 15 attached to the communication terminal device 10 of the present embodiment. The UICC 15 is composed of, for example, an IC module, and includes a control unit 150 including a CPU, a storage unit 151 serving as a storage unit including a ROM and a RAM, an I / O interface unit 152 for communicating with the communication terminal device main body, and the like. It has.

  The storage unit 151 includes a system area 151a in which basic programs, applets, data, and the like used mainly for control by the control unit 150, a USIM area 151b as a first storage unit, and an ISIM as a second storage unit. And a region 151c. The USIM and the ISIM may be configured with separate IC cards so that they can be individually attached to and detached from the main body of the communication terminal device 10.

  The USIM area 151b stores various types of information and data for realizing the USIM function of the mobile communication service, such as a plurality of identification information such as IMSI, MSISDN, and IMEI described above, and a telephone / address book.

  In addition, in the ISIM area 151c, when registration of use of the IMS communication service is completed, a plurality of identification information such as the above-mentioned IMPU and IMPI, and a SIP (Session Initiation Protocol) relay server to which the communication terminal apparatus 10 should be connected The information, data, etc. for realizing the ISIM function of the IMS communication service, such as the address of the P-CSCF 251, are stored.

  The system area 151a of the storage unit 151 also stores an applet that is a relatively small program used for processing in the UICC 15. For example, in the system area 151a, a temporary IMPU that is temporarily used for rewriting and reading setting information in the XDM server 256 is generated based on the IMSI or MSISDN that is the subscriber identification information stored in the USIM area 151b. An applet that performs processing to be stored in the ISIM area 151c is stored.

  In the communication terminal device 10 having the above-described configuration, it is possible to use a VoLTE call service provided by IMS and an additional service by VoLTE such as incoming call transfer and interrupt incoming call. Control of these VoLTE and its additional services is realized by using setting information stored as an XCAP document (XML document) in the XDM server 256. The setting information stored as an XCAP document in the XDM server 256 can be rewritten or read out using the XCAP message by accessing the XDM server 256 from the communication terminal device 10. In addition, rewriting and reading of the setting information can be performed for each communication terminal device or for each user.

  FIG. 4 is a sequence diagram illustrating an example of a processing procedure from when the power of the communication terminal device 10 according to the present embodiment is turned on to when a voice communication of VoLTE via the IMS network 250 becomes possible. From the time the power is turned on in the communication terminal device 10 until voice communication via the IMS network 250 becomes possible, the location registration procedure (attach procedure) to the LTE core network (EPC) 240 and the IMS network 250 as shown below. It is necessary to carry out two procedures of registration procedure. 4 shows an example in which the 3G core network 220 and the LTE core network (EPC) 240 perform location registration in cooperation with each other, the 3G core network 220 and the LTE core network ( EPC) 240 may be individually registered for location.

  4, first, when the power of the communication terminal apparatus 10 is turned on (S101), the communication terminal apparatus 10 transmits a location registration request (attach request signal) to the MME 242 (S102). Here, an APN (access point name) that is an address name set as a connection destination is not transmitted from the communication terminal device 10.

  Next, the MME 242 performs a location registration procedure with the HSS 241 based on the location registration request (attach request signal) received from the communication terminal device 10, and sets the subscriber profile including the APN for VoLTE as the HSS 241. (S103). In addition, the MME 242 transmits a location registration request to the MSC 224 for location registration in cooperation with the 3G core network 220 (S104). The MSC 224 performs a location registration procedure with the HSS 241 based on the registration request received from the MME 242 (S105), and transmits a location registration response to the MME 242 (S106).

  Next, the MME 242 determines a connection destination PGW 244 based on the information of the APN for VoLTE acquired from the HSS 241 and constructs a bearer for VoLTE (SIP bearer) in the LTE core network (EPC) 240. A VoLTE bearer setting request is transmitted to the PGW 244 (S107). The PGW 244 executes the LTE bearer setting procedure, assigns the IP address of the communication terminal device 10 in the procedure, and specifies the address of the P-CSCF 251 to which the communication terminal device 10 should be connected (S108). Further, the PGW 244 sets the address of the P-CSCF 251 in the PCO (protocol configuration option) which is an information element used when directly exchanging information with the communication terminal apparatus 10, and the address of the P-CSCF 251 is set. The bearer response including the received PCO is notified to the MME 242 (S109). Based on the bearer response received from the PGW 244, the MME 242 transmits an attach completion signal including the PCO in which the P-CSCF address is set to the communication terminal device 10 (S110). Thereby, the attachment procedure to the LTE core network (EPC) 240 is completed, and a bearer for VoLTE (SIP bearer) is constructed.

  After completing the procedure for attaching to the LTE core network (EPC) 240, the communication terminal apparatus 10 starts the IMS registration process and starts the IMS registration procedure for the S-CSCF 252 via the SIP bearer (S111). First, the communication terminal apparatus 10 transmits an IMS registration request signal to the S-CSCF 252 via the P-CSCF 251 (S112). In this IMS registration request signal, IMEI (international mobile device identification number) which is a terminal identifier of the communication terminal device 10 and ICSI (IMS communication service identifier) which is a value indicating IMS voice service are set. These pieces of information are used for IMS service control and billing control.

  When the IMS registration request signal from the communication terminal apparatus 10 reaches the S-CSCF 252 via the P-CSCF 251, the S-CSCF 252 performs an S-CSCF registration procedure with the HSS 241 (S 113), and is acquired from the HSS 241. The user authentication procedure is performed with the communication terminal device 10 based on the information necessary for the user authentication (S114). After successful user authentication, the S-CSCF 252 downloads and holds service control information for the user of the communication terminal device 10 from the HSS 241 (S115), and notifies the communication terminal device 10 of IMS registration completion (S116). When the communication terminal apparatus 10 receives this IMS registration completion, the IMS registration process is completed.

Next, processing when performing voice transmission of VoLTE from the communication terminal device 10 according to the present embodiment will be described.
FIG. 5 is a sequence diagram illustrating an example of a processing procedure when performing VoLTE voice transmission in the communication terminal device according to the present embodiment. In FIG. 5, the communication terminal terminals on the voice transmitting side and the voice receiving side of VoLTE are shown separately from the communication terminal device 10S and the communication terminal device 10R, respectively. Further, the VoLTE profile used in this example employs a method of connecting a VoLTE session after completion of bearer settings for both incoming and outgoing voice media called “precondition”.

  In FIG. 5, when the user operates the communication terminal device 10S to perform a transmission operation for voice communication (S201), the communication terminal device 10S transmits an INVITE signal to the P-CSCF 251 via the SIP bearer. (S202). The INVITE signal is delivered to the other IMS network 70 and the communication terminal device 10R via the P-CSCF 251, the S-CSCF 252, and the AS 254. In the INVITE signal, the identifier of the originating user, the identifier of the terminating user, the use of precondition, the codec capability of the originating communication terminal device 10S, and the like are set.

  The IMS network 80 on the receiving side transmits a session progress message (183, session progress) to the P-CSCF 251 as a response to the INVITE signal (S203). Information such as the codec of the communication terminal device 10R on the receiving side is set in the session progress status message.

  When the P-CSCF 251 receives a session progress status message from the IMS network 80 on the receiving side, the P-CSCF 251 transmits a service notification instructing the construction of a voice media bearer to the PCRF 245 (S204). The PCRF 245 performs voice media bearer construction and QoS setting in cooperation with the PGW 244 and SGW 243 of the core network 240 (S205).

  Further, the P-CSCF 251 transmits a session progress status message (183, session progress) to the communication terminal device 10S on the transmission side (S206). When receiving the session progress status message from the P-CSCF 251, the communication terminal device 10 </ b> S compares its own capability with the capability of the communication terminal device 10 </ b> R on the receiving side and determines a codec to be used for voice communication. Then, communication terminal apparatus 10S notifies the determined codec information to communication terminal apparatus 10R on the receiving side using a PRACK signal, and obtains a 200 OK signal response from communication terminal apparatus 10R (S207).

  Next, the originating communication terminal apparatus 10S transmits an UPDATE signal to the IMS network 80 on the receiving side, and receives a 200 OK signal as a response from the IMS network 80 on the receiving side. It is confirmed that the voice media bearer and QoS have been set up with the IMS network 80 (S208, S209). Thereafter, the terminating IMS network 80 starts user call processing using a RINGING and PRACK signal (S210, S211), and when the user of the terminating communication terminal device 10R responds to the call (S212), the terminating IMS The network 80 transmits a response signal (200 OK signal) to the communication terminal device 10S on the transmission side (S213). When the response signal from the IMS network 80 on the incoming side reaches the communication terminal device 10S on the outgoing side, a VoLTE voice communication session is established between the communication terminal devices 10S and 10R, and an actual voice call is started ( S214).

  In the communication terminal device 10, when an incoming call is received from another communication terminal device during a call, it is possible to use an interrupt incoming call service for temporarily holding the call and responding to the incoming call. This interrupt incoming call service may have different processing procedures depending on whether the communication terminal apparatus 10 is located in a 3G cell or a 4G (LTE) cell. This is because a 3G communication system and an LTE communication system may have different methods of providing a call waiting (CW: communication waiting) service.

  When the communication terminal device 10 is located in a 3G cell, and when an NW (network) -based CW service is provided from the network side, the network side device such as a server can perform XCAP (XML, configuration, access, access). On the basis of the reference result of the CW setting information, which is ON / OFF setting information for interrupt incoming by the protocol), the CW service ON (interrupt incoming permission) / OFF (interrupt incoming rejection) is determined, and the communication terminal device 10 on the called side is determined. It is determined whether or not to accept the second call which is an interrupt incoming call. In this case, the network side device needs to control the ON / OFF of the second call interruption based on the reference result of the CW setting information by XCAP.

  On the other hand, when the communication terminal device 10 is located in a 4G (LTE) cell and the terminal-based CW service is provided from the network side, the communication terminal device 10 may receive the CCAP setting information by XCAP. Based on the reference result, it is determined whether the CW service is ON (interrupt call acceptance) / OFF (interrupt call rejection), and the second call is received as an interrupt call and notified to the user, or the second call interrupt call is rejected. To decide.

  As described above, when the network side processing of the interrupt incoming call service (CW service) differs depending on the type of the visited network (3G cell, 4G cell) in which the communication terminal device 10 is located, the communication terminal device 10 uses XCAP. A function for referring to CW setting information, a function for storing the CW setting information in the terminal, and a function for performing ON / OFF control of an interrupt incoming call service (CW service) based on the CW setting information stored in the terminal; Must be implemented.

Therefore, the communication terminal device 10 of the present embodiment is mounted as shown in the following (A1) to (A3).
(A1) Reflecting ON / OFF setting information (CW setting information) of the CW service on the XDM server 256 on the network side using communication by XCAP.
(A2) The CW service ON / OFF setting information (CW setting information) is held inside the communication terminal device 10.
(A3) The communication terminal apparatus 10 holds an initial value of ON / OFF setting of the CW service (for example, initial value: ON).

Further, the communication terminal apparatus 10 according to the present embodiment performs the following control (B1) to (B2) when receiving an interrupt incoming call for the second call while the 4G (LTE) cell is in the service area.
(B1) When the CW setting information is ON: The AS 254 of the IMS network 250 determines that the communication terminal device 10 has received the second call interruption, and transmits the second call interruption reception to the communication terminal device 10. The communication terminal device 10 notifies the user of the second call interruption arrival and transmits a response signal including a ringing (180 Ringing) message to the second call communication terminal device. Here, when the AS 254 of the IMS network 250 receives the response signal including the message being called from the communication terminal device 10, the AS 254 receives the response signal including the message received from the communication terminal device 10 or another predetermined message. The call is transferred to the communication terminal device.
(B2) When the CW setting information is OFF: The AS 254 of the IMS network 250 determines that the communication terminal device 10 has received the second call interruption, and transmits the second call interruption reception to the communication terminal device 10. The communication terminal device 10 does not notify the user of the second call interruption, and transmits a response signal including a busy (486 Busy Here) message to the second call communication terminal device. When the IMS AS receives a response signal including the busy message from the communication terminal device 10, the IMS AS transmits the response signal received from the communication terminal device 10 or another predetermined message to the second call. Transfer to the communication terminal.

  FIG. 6 shows the case where the communication terminal device 10B of the user B whose ON / OFF setting information (CW setting information) for interrupt incoming is set to OFF is based on the communication terminal device 10C of the user C and VoLTE when the user B is in the 4G (LTE) cell area. It is a sequence diagram which shows an example of a process when the interruption incoming call of the 2nd call is received from the communication terminal device 10A of the user A during a call.

  In FIG. 6, the communication terminal device 10 </ b> B sets the ON / OFF setting information (CW setting information) for incoming interrupts to OFF by the operation of the user B, and stores the setting information in a predetermined memory of the main control unit 110. For NW-based CW processing in 3G, the setting information is transmitted and registered to the XDM server 256 of the IMS network 250 by XCAP (PUT: Deactive) (S301).

  Then, during a call based on VoLTE between the communication terminal apparatus 10B of user B and the communication terminal apparatus 10C of user C, a call based on VoLTE is made from the communication terminal apparatus 10A of user A to the communication terminal apparatus 10B of user B. (S302). Then, the INVITE (B) signal that is a session establishment request is transmitted from the communication terminal device 10A of the user A to the IMS network 250 via the IMS network 80 of the user A (S303). Here, in the IMS network 250, the CW setting information of a predetermined XML document stored in the XDM server 256 is set to OFF by user B's terminal operation in step S301 (S304). The IMS network 250 that has received the INVITE (B) signal because it is a base CW transmits a provisional response of the INVITE (B) signal to the communication terminal apparatus 10B of the user B (S305).

  Thereafter, the communication terminal device 10B of the user B calls the interrupt incoming call setting information (CW setting information) stored in the predetermined memory of the main control unit 110 in step S301, and starts processing according to the setting. That is, a busy (486 Busy Here) message is transmitted to the communication terminal device 10A of the user A via the IMS network 250 and the ISM network 80 of the user A (S309).

  When the application side of the communication terminal apparatus 10B controls ON / OFF of the CW service, the AS 254 of the IMS network 250 responds to the calling (180 RINGING) message from the communication terminal apparatus 10B of the user B in step S307. Only when the signal is received, it can be detected that the second terminal has been interrupted by the communication terminal device 10A of the user A. Therefore, immediately after transmitting the call (180 RINGING) message, the communication terminal apparatus 10B of the user B is talking to the communication terminal apparatus 10A of the user A via the IMS network 250 and the ISM network 80 of the user A ( 486 Busy Here) message is transmitted (S309).

  In the interrupt incoming call processing described with reference to FIG. 6, when the interrupt incoming call setting information (CW setting information) of the communication terminal device 10B of the user B residing in the 4G (LTE) cell is OFF, the communication terminal of the user C When a second call interruption is received from the communication terminal apparatus 10A of the user A during a VoLTE call with the apparatus 10C, a call with another communication terminal apparatus is performed without notifying the user of the interruption reception of the second call. It is possible to reliably transmit a response signal including a busy message to the effect to the communication terminal device 10A of the user A.

  In addition, when the communication terminal apparatus 10B of the user B whose interruption incoming call setting information (CW setting information) is set to OFF is located in the 3G (WCDM) cell, when receiving an incoming incoming call for the second call, The network side device does not transmit the interrupt incoming signal of the second call to the communication terminal device 10 based on the interrupt incoming call setting information (CW setting information), and the communication terminal device 10B receives the user notification of the incoming call of the second call. Not done.

  FIG. 7 shows the communication terminal device 10B of user C and VoLTE when the communication terminal device 10B of user B whose ON / OFF setting information (CW setting information) for interrupt incoming is set to 4G (LTE) cell coverage. It is a sequence diagram which shows an example of a process when there exists a 2nd call interruption incoming call from the communication terminal device 10A of the user A during a telephone call.

  In FIG. 7, the communication terminal device 10 </ b> B sets ON / OFF setting information (CW setting information) for an interrupt incoming call by the operation of the user B, and stores the setting information in a predetermined memory of the main control unit 110. For NW-based CW processing in 3G, the setting information is transmitted and registered to the XDM server 256 of the IMS network 250 by XCAP (PUT: Deactive) (S401).

  Then, during a call based on VoLTE between the communication terminal apparatus 10B of user B and the communication terminal apparatus 10C of user C, a call based on VoLTE is made from the communication terminal apparatus 10A of user A to the communication terminal apparatus 10B of user B. (S402). Then, the INVITE (B) signal, which is a session establishment request, is transmitted from the communication terminal device 10A of the user A to the IMS network 250 via the IMS network 80 of the user A (S403). Here, in the IMS network 250, the CW setting information of a predetermined XML document stored in the XDM server 256 is set to ON by the user B's terminal operation in step S401 (S404). Then, the IMS network 250 that has received the INVITE (B) signal transmits a provisional response of the INVITE (B) signal to the communication terminal device 10B of the user B (step S405).

  Thereafter, a session progress message (183, session progress) / PRACK / between the communication terminal device 10A of the user A and the communication terminal device 10B of the user B via the IMS network 250 and the IMS network 80 of the user A The UPDATE process is executed (S406). The session progress message / PRACK / UPDATE process in step S406 is the same process as step S306 described with reference to FIG.

  Next, when it is confirmed by the session progress status message / PRACK / UPDATE process in step 406 that the IP bearer is ready for both incoming and outgoing calls, the call of the communication terminal device 10B of the user B, which is the called party, is called. The communication terminal device 10B notifies the user A that there is an interrupt incoming call (step S407). In addition, the fact that the communication terminal device 10B has started calling is transmitted to the calling side by a calling (180 RINGING) message (S408). The AS 254 of the IMS network 250 that has received this in-call message transmits a session progress status message to the communication terminal apparatus 10A of the user A via the IMS network 80 of the user A (S409).

  When the application side of the communication terminal device 10B controls ON / OFF of the CW service as in the case of FIG. 6 described above, the AS 254 of the IMS network 250 causes the communication terminal device 10B of the user B to perform the above operation in step S408. Only when a call (180 RINGING) message is received, it can be detected that a second call has been interrupted from user A's communication terminal apparatus 10A. Therefore, immediately after transmitting the call (180 RINGING) message, the communication terminal apparatus 10B of the user B successfully establishes a session with the communication terminal apparatus 10A of the user A via the IMS network 250 and the ISM network 80 of the user A. A (200 OK) message is transmitted (S410). The communication terminal apparatus 10A of the user A that has received this session establishment success (200 OK) message transmits an ACK (acknowledgment) message via the IMS network 80 and the IMS network 250 of the user A (S411). The communication terminal device 10B of the user B that has received the ACK message puts the call with the communication terminal device 10C of the user C on hold (HOLD), and interrupts the second call with the communication terminal device 10A of the user A. You can start an incoming call.

  In the interrupt incoming call processing described with reference to FIG. 7, when the interrupt incoming call setting information (CW setting information) of the communication terminal device 10B of the user B residing in the 4G (LTE) cell is ON, the communication terminal of the user C When a second call interruption is received from the communication terminal device 10A of the user A during a VoLTE call with the device 10C, the call of the first call with the communication terminal device 10C of the user C is put on hold, and the user A response signal including a session establishment success (200 OK) message for initiating a second call interruption incoming call with the communication terminal apparatus 10A of A can be reliably transmitted to the communication terminal apparatus 10A of user A. .

  In addition, when the communication terminal apparatus 10B of the user B whose interruption incoming call setting information (CW setting information) is set to ON is in the 3G (WCDM) cell, when receiving an incoming incoming call for the second call, The network side device transmits an interrupt incoming signal for the second call to the communication terminal device 10 based on the interrupt incoming call setting information (CW setting information). In the communication terminal device 10B that has received this interrupt incoming call signal, the user is notified of the second call interrupt incoming call.

As described above, according to the present embodiment, the communication terminal apparatus 10 is located in an LTE cell, which is an area capable of wireless communication with a 4G mobile communication network, and the first call via the packet data network. When a second call interruption is received during the VoLTE call, a response signal for the interruption reception is set in the ON setting based on the ON / OFF setting information of the interruption reception held in the communication terminal device 10. It is possible to reliably transmit to the communication terminal device of the second call, and in the case of the OFF setting, the user is not notified of the second call interruption, and a response signal indicating that the call is in progress is sent to the second call It can be transmitted to the communication terminal device.
Further, according to the present embodiment, during a voice call with a first call via a circuit switched network that is located in a WCDMA (registered trademark) cell that is an area capable of wireless communication with a 3G mobile communication network. When an incoming call for the second call is received, an interrupt incoming signal is transmitted to the communication terminal device 10 in the case of the ON setting based on the ON / OFF setting information for the incoming call that is held in the network side device, and is notified by the user. In the case of OFF setting, the interrupt incoming call signal is not transmitted to the communication terminal device 10 and the user is not notified.
As described above, according to the present embodiment, in the communication terminal device 10 having both the voice communication function via the 4G mobile communication network and the voice communication function via the 3G mobile communication network, the 4G cell When the second call interrupt is received during a call with the first call while being in each of the 3G cell and the 3G cell, the interrupt according to the ON / OFF setting state (CW setting state) of the interrupt incoming call An incoming call service can be reliably provided.

DESCRIPTION OF SYMBOLS 10 Communication terminal device 10A User A's communication terminal device 10B User B's communication terminal device 10C User C's communication terminal device 20 Mobile communication network 60 External circuit switched telephone network 70 Internet 80 External IMS network 210 Radio access network 211 3G Base station (NodeB)
212 LTE base station (eNodeB)
220 3G Core Network 221 HLR (Location Registration Device)
224 MSC (switch)
225 GMSC (Kanmon Exchange)
230 Dedicated packet data network 240 LTE core network (EPC)
241 HSS (Home Subscriber Server)
242 MME (Mobility Management Entity)
243 SGW (Serving Gateway)
244 PGW (packet data network / gateway)
245 PCRF (policy charging control device)
250 IMS (IP Multimedia Subsystem) Network 251 P-CSCF (Proxy-Call / Session / Control Function)
252 S-CSCF (Serving-Call / Session / Control Function)
253 I-CSCF (Inquiry / Call / Session / Control Function)
254 AS (Application Server)
256 XDM (XML document management) server

GSMA PRD IR. 92: “IMS Profile for Voice and SMS”, Mar. 2011. 3GPP TS 24.615 V12.1.0 (2014-06), “Communication Waiting (CW) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification (Release 12)”. 3GPP TS 23.003 V12.2.0 (2014-03), “Technical Specification Group Core Network and Terminals; Numbering, addressing and identification (Release 12)”.

Claims (3)

A communication terminal device capable of communicating via a 4G mobile communication network having a packet data network and a 3G mobile communication network having a circuit switching network, and the mobile communication so as to control voice communication by the communication terminal device A communication system comprising a server provided in the network,
The communication terminal device
Voice communication means capable of calling through a packet data network and a circuit switching network;
Means for storing ON / OFF setting information for interrupting incoming calls of the second call during a call with the first call;
Means for transmitting the interrupt incoming ON / OFF setting information to the server;
When an incoming call for a second call is received during a call that is in a wireless communication area with a 4G mobile communication network and is communicating with the first call, the call is stored in the communication terminal device. Means for controlling a user notification of an interrupt incoming call for the second call based on the ON / OFF setting information of the incoming interrupt call;
When an incoming call for the second call is received during a call that is in the area where wireless communication with the 3G mobile communication network is possible and a call is made with the first call, the incoming call for the second call is received. Means for performing user notifications,
The server
Means for receiving from the communication terminal device ON / OFF setting information for the interruption incoming call of the second call;
Means for storing ON / OFF setting information of the interrupt incoming call received from the communication terminal device;
When the communication terminal device is in a wireless communication area with a 4G mobile communication network and is talking to the first call, the communication terminal device receives an interrupt incoming call for the second call to the communication terminal device. Means for transferring the second call interrupt incoming call to the communication terminal device regardless of the ON / OFF setting information of the interrupt incoming call stored in the server,
When the communication terminal device is in a wireless communication area with a 3G mobile communication network and is talking to the first call, the communication terminal device receives an interrupt incoming call for the second call to the communication terminal device. Means for controlling the transfer of the interrupt incoming call of the second call to the communication terminal device based on the ON / OFF setting information of the incoming call interrupt stored in the server. Communications system. The communication system of claim 1.
The communication terminal device
When an incoming call for a second call is received during a call that is in an area where wireless communication with a 4G mobile communication network is possible and a call is being made with the first call, an incoming call for the second call is received. Means for transmitting a call signal to the server, and thereafter transmitting a response signal to the communication terminal device of the second call,
The server
Means for determining that there has been an interrupt incoming call for the second call by receiving a call signal in response to an incoming call interrupt for the second call, and transmitting a signal indicating a session progress status to the communication terminal device for the second call;
And means for transferring the response signal received subsequent to the call signal to the communication terminal device for the second call after transmitting a signal indicating the session progress status. The communication system of claim 2,
The communication terminal device
ON / OFF of the incoming call when the second call is received during a call that is in the area where wireless communication with the 4G mobile communication network is possible and is communicating with the first call When the setting information is OFF, a communication signal is transmitted to the communication terminal device of the second call without performing a user notification of an interruption arrival of the second call and indicating that a call is in progress.

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