JPWO2011162349A1 - Gateway device, mobile circuit switching network, voice data relay method and program - Google Patents

Abstract

Between a mobile terminal that connects to a mobile IP network and performs VoIP voice communication and TV phone communication over IP, and an existing mobile terminal that connects to an existing circuit switched network and performs circuit switched voice communication and TV phone communication Audio data (TV phone communication data) is relayed. The gateway device determines the protocol to be used for connection based on the determination result of determining whether the connection destination gateway device is a gateway device on a mobile IP network or a gateway device on another mobile circuit switched network. A conversion unit for switching is provided, and the mobile terminal connected to the radio base station control apparatus on the own apparatus side and the mobile terminal connected to the network to which the gateway apparatus of the connection destination belongs are interconnected to relay voice data.

Description

[Description of related applications]
The present invention is based on the priority claim of Japanese Patent Application: Japanese Patent Application No. 2010-143377 (filed on June 24, 2010), the entire contents of which are incorporated herein by reference. Shall.
The present invention relates to a gateway device, a mobile circuit switching network, a voice data relay method, and a program, and in particular, interconnects a mobile terminal connected to a mobile IP network and a mobile terminal connected to a mobile circuit switching network. The present invention relates to a gateway device, a mobile circuit switching network, a voice data relay method, and a program for realizing voice communication between portable terminals.

  Until now, in mobile phone terminals and mobile networks using third-generation W-CDMA (Wideband Code Division Multiple Access) technology and the like, voice calls have been realized in a circuit switched (CS) system, but mobile In response to the flow of IP in the core network, the flow of CSIP (Circuit Switched over IP Network) that makes circuit switching IP and connects to the IMS network is emerging. In other words, the circuit switching side transmits / receives an ISUP (ISDN User Part) call control signal and a voice compression-encoded bit stream based on an ATM (Asynchronous Transfer Mode) bearer or the like, but an IMS (IP Multimedia Subsystem) network side A SIP (Session Initiation Protocol) signal is used for control, and an audio compression-encoded bit stream is stored in an RTP (Real-time Transport Protocol) packet and transmitted / received.

  On the other hand, with the research and development of high-speed and large-capacity technology for mobile networks, the mobile network is going to realize higher speed and larger capacity based on IP. (High Speed Downlink Access), HSPA (High Speed Packet Access), HSPA +, EVDO (Evolution Data Only (Optimized)) Rev. A, EVDO Rev. B etc. are put into practical use.

  In the future, the speed of mobile access networks will further increase, LTE (Long Term Evolution) aiming at 100 Mbps (megabits / second) in the downlink direction and 50 Mbps in the uplink direction, EPC (Evolved Packet Core) that is an IP backbone network that supports it, etc. Is the flow of introduction.

  In the future, it is necessary to continue to support voice communication even in terminals that support high-speed mobile IP networks such as LTE and EPC that are expected to appear in the future. Note that voice communication in LTE / EPC is VoIP voice communication using RTP packets.

  Patent Document 1 discloses an example of a gateway device that interconnects a mobile circuit switching network and a mobile IMS network to realize a TV phone. This gateway device separates a multiplexed bit stream signal output from a mobile terminal connected to a mobile circuit switching network, and at least a control signal, a compression-encoded audio signal, and a compression-encoded video signal One control signal is converted into at least one of a MEGACO (H, 248) signal, a SIP signal, and an SDP (Session Description Protocol) signal, and the audio signal is converted into a video signal if necessary, and the audio signal and A conversion unit that packetizes the video signal and sends it to the IMS network is provided.

JP 2009-267669 A

  The analysis according to the invention is given below.

  For example, when LTE and EPC are introduced, all existing terminals are replaced with new terminals that support LTE and EPC VoIP, and VoIP voice over IP is connected to LTE and EPC networks. Since there will be a mix of new mobile terminals that perform communications and TV phone communications and existing mobile terminals that connect to existing circuit-switched networks and perform circuit-switched voice communications and video-phone communications, voice over circuit-switched networks There is a need to interconnect communication or TV telephone communication with VoIP voice communication or TV telephone communication over IP in LTE and EPC networks.

  However, at present, in order to enable mutual connection between a new mobile terminal connected to the LTE and EPC networks and an existing mobile terminal connected to the existing mobile circuit switching network, the serving of the LTE and EPC networks There are no gateway devices that can be connected to each other because the protocol used in the gateway device (Serving Gateway), the protocol for connecting mobile circuit exchanges, and the protocol for connecting to PSTN (Public Switched Telephony Networks) are different. In other words, it was difficult to realize interconnection of voice communication and videophone communication. In order to promote the spread of new terminals in the future, it is necessary to prepare an environment for realizing the interconnection between the new terminals and the existing terminals.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to connect to a mobile IP network typified by the mobile LTE / EPC network and perform VoIP voice communication or videophone over IP. A gateway device for relaying voice data (TV phone communication data) between a mobile terminal that performs communication and an existing mobile terminal that is connected to an existing circuit switching network and performs circuit switching voice communication or TV phone communication; To provide a mobile circuit switching network, a voice data relay method, and a program.

  According to the first aspect of the present invention, based on the determination result of determining whether the connection destination gateway device is a gateway device on a mobile IP network or a gateway device on another mobile circuit switching network. A conversion unit that switches a protocol used for connection, and interconnects a mobile terminal connected to a radio base station control device on its own device and a mobile terminal connected to a network to which the gateway device of the connection destination belongs, A gateway device that relays voice data is provided.

  According to a second aspect of the present invention, there is provided a mobile circuit switching network in which a gateway device that performs protocol switching according to the connection destination is arranged.

  According to a third aspect of the present invention, there is provided a gateway device that interconnects a gateway device on a mobile IP network and a radio base station control device on a mobile circuit switching network to which the device belongs and relays voice data. A step of determining a type of a gateway device of a connection destination including whether it is a gateway device on a mobile IP network or a gateway device on another mobile circuit switching network, and connection is made according to the determined connection destination And switching the protocol to be used to relay the voice data. This method is linked to a specific machine called a gateway device that interconnects S-GW and a radio base station control device on a mobile circuit switching network and relays voice data via an IMS network.

  According to a fourth aspect of the present invention, a gateway device that relays voice data by interconnecting a gateway device on a mobile IP network and a radio base station control device on a mobile circuit switching network to which the device belongs is configured. A program to be executed by a computer for determining a type of a gateway device to be connected including a gateway device on a mobile IP network or a gateway device on another mobile circuit switched network; A program for causing the computer to execute a process of switching the protocol used for the connection and relaying the audio data according to the determined connection destination is provided. This program can be recorded on a computer-readable storage medium. That is, the present invention can be embodied as a computer program product.

  According to the present invention, a mobile terminal connected to a mobile IP network represented by the mobile LTE / EPC network and performing VoIP voice communication and TV phone communication over IP, and a circuit switching connected to an existing circuit switching network. The voice data can be relayed to / from existing portable terminals that perform voice communication and TV phone communication.

It is a figure showing the whole structure of the 1st Embodiment of this invention. It is a figure showing the detailed structure of the gateway apparatus of the 1st Embodiment of this invention. It is a figure showing the whole structure of the 2nd Embodiment of this invention. It is a figure showing the detailed structure of the gateway apparatus of the 2nd Embodiment of this invention.

  First, an outline of an embodiment of the present invention will be described. Hereinafter, the reference numerals of the drawings attached to this summary are merely examples for assisting understanding, and are not intended to be limited to the illustrated embodiments. The gateway device according to the present invention (see 210 in FIG. 3) is a gateway device on a high-speed mobile IP network such as a mobile LTE / EPC network (for example, Serving Gateway; see S-GW 139 in FIG. 3). ) Or a gateway device on another mobile circuit switching network (see gateway device 210b in FIG. 3), a conversion unit that switches a protocol used for connection is determined.

  As described above, for example, it is possible to convert between a protocol used in a serving gateway device (serving gateway) of a mobile LTE / EPC network and a protocol for connecting mobile circuit exchanges. Connected to a mobile base station that performs VoIP voice communication or TV phone communication over IP, and a radio base station control device on its own side that connects to an existing circuit switching network and performs circuit switching voice communication or TV phone communication. Audio data can be relayed to and from portable terminals.

[First Embodiment]
Subsequently, a first embodiment of the present invention will be described. Hereinafter, LTE and EPC networks (hereinafter referred to as “mobile LTE / EPC networks”) are used as high-speed mobile IP networks.

  The gateway device according to the present invention is connected to an IMS (IP Multimedia Subsystem) network, and is described as a serving gateway device (Serving Gateway; hereinafter referred to as “S-GW”) on the mobile LTE / EPC network via the IMS network. Between the mobile terminal connected to the mobile LTE / EPC network and the mobile terminal connected to the RNC. It realizes the interconnection of voice communication and the interconnection of TV phone communication.

  Here, the call control signal between the gateway device according to the present invention and the S-GW connected to the mobile LTE / EPC network uses SIP (Session Initiation Protocol) used in IMS or VoIP, and mobile LTE. / EPC network bearer transfers.

  On the other hand, a voice signal between the gateway device according to the present invention and the radio base station control device on the mobile circuit switching network is transferred using an IuUP (Iu U-Plane) protocol which is a circuit switching protocol. Also, the TV phone signal in the same section is ITU-T H.264. Assume that the data is transferred using the H.223 protocol.

  FIG. 1 is a diagram showing an overall configuration of a first embodiment of the present invention. Referring to FIG. 1, a PSTN network 132, mobile circuit switched networks 130 and 130b connected via an IMS network 131, and a mobile LTE / EPC network 140 are shown.

  The portable terminals 120 and 120b are voice telephone terminals that can be connected to the mobile circuit switching networks 130 and 130b. As such a portable terminal 120, an existing voice telephone terminal can be used as it is.

  The portable terminals 120 and 120b are connected to the mobile circuit switching networks 130 and 130b, and exchange call control signals and voice signals with the gateway devices 110 and 110b via the radio base station controllers (RNCs) 135 and 135b. To do.

  The mobile terminals 120 and 120b are equipped with, for example, an AMR (Adaptive Multi-Rate) audio codec as an audio codec, and transmit and receive a bit stream obtained by compressing and encoding an audio signal at a bit rate of 12.2 kbps, for example. To do.

  The details of the AMR audio codec can be referred to 3GPP (Third Generation Partnership Project) TS26.090 standard and the like.

  The portable terminal 150 is a voice telephone terminal that can be connected to the mobile LTE / EPC network 140.

  The gateway device 110 exchanges a call processing signal used in the mobile circuit switching network 130 with the mobile terminal 120, for example, an ISUP (Integrated Services Digital Network Part Part) call control signal, and the like as an AMR compression code as voice data. Exchange bitstreams.

  The gateway device 110 is connected to the mobile circuit switching network whether the connection partner is the S-GW 139 on the mobile LTE / EPC network 140 or the gateway device (PSTN gateway device) 133 on the PSTN network 132 via the IMS network 131. It is determined whether the gateways 130 are connected to each other, and the U-Plane (User Plane) protocol to be transmitted is switched depending on which gateway is selected.

  Since the C-Plane (Control Plane) protocol passes through the IMS network, the ISUP call control signal is converted into a SIP call control signal, and the CSCF device (Call Session Control Function; session control device on the IMS network 131). ) Output to 137.

  The gateway device 110b on the mobile circuit switching network 130b to which the portable terminal 120b is connected is assumed to have the same configuration as the gateway device 110.

  Next, the detailed configuration of the gateway device 110 will be described with reference to FIG.

  FIG. 2 is a diagram showing a detailed configuration of the gateway device 110 of FIG. Referring to FIG. 2, the gateway device 110 according to the first embodiment of the present invention includes a call control / conversion unit 160 and a conversion unit 250. Furthermore, the conversion unit 250 includes a control / analysis unit 180, an IuUP protocol disassembly / assembly unit 200, a protocol switching unit 190, and a packet transmission / reception unit 176 that performs packet transmission / reception with other gateway devices.

  The call control / conversion unit 160 exchanges ISUP call control signals with the radio base station control device 135 on the mobile circuit switching network 130. Specifically, the call control / conversion unit 160 converts the ISUP call control signal into a SIP call control signal and sends it to the CSCF device 137 on the IMS network 131. Also, the SIP call control signal is received from the CSCF device 137, converted into an ISUP call control signal for the mobile circuit switching network, and sent to the radio base station control device 135 on the mobile circuit switching network 130.

  The control / analysis unit 180 analyzes the ISUP call control signal and determines whether the connection destination of the mobile terminal 120 is the S-GW 139 on the mobile EPC / LTE network 140 or the PSTN gateway device 133 on the PSTN network 132. It is determined whether the gateway device 110b is on another mobile circuit switched network 130b, and the determination result is output to the IuUP protocol disassembly / assembly unit 200 and the protocol switching unit 190.

  The IuUP protocol disassembly / assembly unit 200 receives an IuUP protocol frame from the radio base station controller 135. Here, for details of the IuUP protocol, the 3GPP TS25.415 standard, TS26.102, or the like can be referred to.

  When the IuUP protocol disassembly / assembly unit 200 receives the IuUP Initialization frame at the beginning of the call connection, it reads out the RFCI (Rab subFlow Combination Index) in the header of the IuUP Initialization frame and identifies the bit rate of the AMR. Here, it is assumed that the bit rate of AMR is 12.2 kbps. Next, the IuUP protocol disassembly / assembly unit 200 extracts the AMR bitstream stored in the subsequent IuUP frame and outputs it to the protocol switching unit 190.

  Based on the determination result from the control / analysis unit 180, the protocol switching unit 190 determines whether the connection destination of the gateway device 110 is the S-GW 139 on the mobile LTE / EPC network 140 or the PSTN gateway device 133 on the PSTN network 132. The protocol is switched depending on whether it is the gateway device 110b on the other mobile circuit switched network 130b.

(1) When the connection destination is the S-GW apparatus 139 on the mobile LTE / EPC network 140 The protocol switching unit 190 reads the information of the RFCI and FQC (Frame Quality Controller) stored in the IuUP header of the IuUP protocol to obtain IETF The RFC3267 payload format header FT (Frame Type) or Q (Quality) is converted and written to the RFC3267 payload header part, and the AMR bitstream stored in the payload part of the IuUP frame is read to read the RTP payload part of RFC3267 Process to write to.

  Further, since the U-Plane packet of S-GW 139 is tunneled by GTP-U (GPRS Transfer Protocol-Upplane), the protocol switching unit 190 tunnels the RTP packet with the RFC3267 payload format by GTP-U. Encapsulate with GTP-U header. Here, the IP address of the S-GW 139 is written in the header of the GTP-U as a destination, and is sent from the packet transmission / reception unit 176 to the S-GW 139.

  In the reverse direction, when the packet transmission / reception unit 176 receives the GTP-U packet from the S-GW 139, the protocol switching unit 190 reads the RFC3267 payload header and the AMR bitstream from the GTP-U payload portion, and the GTP-U After removing the header, it is output to the IuUP protocol disassembly / assembly unit 200.

(2) When the connection destination is the PSTN gateway device 133 on the PSTN network 132 The protocol switching unit 190 creates an RFC3267 payload header and writes the AMR bitstream in the RTP payload portion by the same processing as in (1) above. The subsequent processing is different from (1), and the protocol switching unit 190 transmits the packet from the packet transmission / reception unit 176 to the PSTN gateway apparatus 133 while maintaining the RTP protocol.

  On the other hand, when the RTP packet is received from the PSTN gateway apparatus 133 on the PSTN network 132, the protocol switching unit 190 reads the FT and Q information in the RFC3267 payload format header and outputs them to the IuUP protocol disassembly / assembly unit 200.

(3) When the connection destination is the gateway device 110b on the other mobile circuit switched network 130b The protocol switching unit 190 stores the IuUP protocol frame in the RTP payload portion and sends it to the gateway device 110b through the packet transmission / reception unit 176. To do.

  On the other hand, when the RTP packet is received from the gateway device 110b on the mobile circuit switching network 130b through the packet transmission / reception device 176 in the reverse direction, the IuUP protocol frame stored in the RTP payload portion is read and the IuUP protocol disassembly / assembly 200 is performed. Output.

  With reference to FIG. 1 again, the subsequent operation will be described. (1) When the connection destination is the S-GW device 139 on the mobile LTE / EPC network 140, the S-GW 139 receives the call control signal from the CSCF device 137 and recognizes that the connection is with the gateway device 110. The GTP-U packet is received from the gateway device 110 and sent to the eNodeB device 138.

  The eNodeB device 138 extracts the RTP packet from the GTP-U packet and sends it to the mobile terminal 150. Note that the reverse connection only needs to be traced in reverse, and the description thereof is omitted.

  (2) When the connection destination is the PSTN gateway device 133, the PSTN gateway device 133 receives the call control signal from the CSCF device 137, recognizes that the connection is with the gateway device 110, and receives the RTP packet from the gateway device 110. And the AMR stream stored in the payload portion of the RTP packet as G. After being converted to 711, it is output to the PSTN network. In addition, since the connection of a reverse direction should just reverse the above, description is abbreviate | omitted.

  (3) When the connection destination is the gateway device 110b on the mobile circuit switched network 130b, the gateway device 110b receives the call control signal from the CSCF device 137, recognizes that the connection is made with the gateway device 110, and the gateway device The RTP packet is received from 110, the IuUP protocol frame stored in the RTP payload portion is read out and sent to the radio base station controller 135b.

  The radio base station controller 135b reads the AMR stream from the IuUP protocol frame and transmits it to the mobile terminal 120b. In addition, since the connection of a reverse direction should just reverse the above, description is abbreviate | omitted.

  As described above, according to the present embodiment, a new terminal that supports voice calls via a high-speed mobile IP network such as a mobile LTE / EPC network and an existing terminal that supports only voice calls via a mobile circuit switching network Voice communication interconnection with can be realized. The reason is that the connection destination of the gateway device is an S-GW on the mobile LTE / EPC network, a connection with a gateway device on another mobile circuit switching network, or a gateway device on the PSTN network. By determining whether or not the protocol used for connection is switched.

[Second Embodiment]
Next, a second embodiment in which the present invention is applied to the interconnection of TV telephone communication will be described.

  FIG. 3 is a diagram showing an overall configuration of the second embodiment of the present invention. Referring to FIG. 3, mobile line networks 130 and 130b connected via an IMS network 131 and a mobile LTE / EPC network 140 are shown.

  The mobile terminals 220 and 220b are mobile terminals that can be connected to the mobile line networks 130 and 130b and can be used for videophone communication. The portable terminal 280 is a portable terminal that can connect to the mobile LTE / EPC network 140 and perform videophone communication.

  As in the gateway of the first embodiment, the gateway device 210 in FIG. 3 is the S-GW 139 on the mobile LTE / EPC network or the gateway device 210b on the mobile circuit switched network 130b. The connection is made after switching the protocol according to the determination result. In addition, since the component which attached | subjected the code | symbol same as FIG. 1 in FIG. 3 operate | moves the same as 1st Embodiment mentioned above, description is abbreviate | omitted.

  FIG. 4 is a diagram showing a detailed configuration of the gateway device 210 of FIG. Referring to FIG. 4, the gateway device 210 according to the second exemplary embodiment of the present invention includes a call control / conversion unit 160 and a conversion unit 350. Further, the conversion unit 350 includes a control / analysis unit 180, H.264 and the like. 223 transmission / reception unit 240; 223 protocol switching unit 290 and a packet transmission / reception unit 276 that performs packet transmission / reception with other gateway devices. In addition, since the component which attached | subjected the code | symbol same as FIG. 2 in FIG. 4 operate | moves the same operation | movement as the gateway apparatus 110 of 1st Embodiment mentioned above, description is abbreviate | omitted.

  H. 223 transmission / reception unit 240 determines whether the connection destination of portable terminal 220 is S-GW 139 on mobile EPC / LTE network 140 or gateway device 210b on mobile circuit switched network 130b from control / analysis unit 180. Input from the radio base station device 135. 223 multiplexed signal is received. It outputs to the H.223 protocol switching unit 290.

  H. The H.223 protocol switching unit 290 determines whether the connection destination of the portable terminal 220 from the control / analysis unit 180 is the S-GW 139 on the mobile EPC / LTE network 140 or the gateway device 210b on the mobile circuit switching network 130b. Based on the above, the protocol is switched. Specifically, when the connection destination is the S-GW 139 on the mobile EPC / LTE network 140, The H.223 protocol switching unit 290 is an H.264 protocol switching unit. 223 multiplexed signal is separated, the video stream and the audio stream are separated, and each of the video stream and the audio stream is stored in a separate RTP packet, and then a GTP-U header is attached to each of the packets. The data is output to the S-GW 139 through the receiving unit 276.

  On the other hand, when the connection destination is the gateway device 210b on the mobile circuit switched network 130b, The H.223 protocol switching unit 290 is an H.264 protocol switching unit. The H.223 multiplexed signal is stored in the payload part of the RTP packet as it is and is output to the gateway apparatus 210b through the packet transmission / reception part 276.

  As described above, the present invention is in videophone communication.

  As described above, according to the present embodiment, only a new terminal that supports TV voice calls via a high-speed mobile IP network such as a mobile LTE / EPC network and a TV voice call via a mobile circuit switching network are supported. Interconnection of TV phone communication with existing terminals can be realized. The reason is that the connection destination of the gateway device is used for connection by determining whether the connection destination of the gateway device is an S-GW on a mobile LTE / EPC network or a gateway device on another mobile circuit switching network. It is configured to switch the protocol to be performed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and further modifications, substitutions, and adjustments may be made without departing from the basic technical idea of the present invention. Can be added.

  For example, in the above-described embodiment, the control / analysis unit 180 is described as being arranged in the conversion units 250 and 350. However, the control / analysis unit 180 is arranged in the call control / conversion unit 160. Can also be adopted.

  In the above-described embodiment, the call control / conversion unit 160 and the conversion units 250 and 350 are described as being arranged on the same gateway device. However, as the call control / conversion device 160 and the conversion device 250 (350), A configuration arranged in each separate apparatus can also be adopted. In the case of such a configuration, for example, ITU-T H.264 can be used for exchanging control signals between the call control / conversion device 160 and the conversion device 250. The H.248 MEGACO (Media Gateway Control) protocol can be used.

  In the above-described embodiment, a mobile LTE / EPC network has been described as an example of a high-speed mobile IP network. However, HSPA, HSPA +, HNB (Home NodeB), HeNB (Home e-NodeB), WiMAX (IEEE 802. 16-2004) or the like.

  Note that each unit (processing means) of the gateway device 110 (210) illustrated in FIG. 1 is realized by a computer program that causes a computer that configures the gateway device 110 to execute the above-described processes using its hardware. You can also.

Finally, a preferred form of the invention is summarized.
[First embodiment]
(Refer to the gateway device from the first viewpoint)
[Second form]
In the gateway device of the first form,
The conversion unit is a gateway device that performs predetermined protocol conversion even when the gateway device of the connection destination is a PSTN gateway device on a public switched telephone network (PSTN).
[Third embodiment]
In the gateway device of the first or second form,
A gateway apparatus comprising an analysis unit (corresponding to the control / analysis unit 180 described above) that determines the type of gateway to be connected based on the result of analyzing an ISUP (Integrated Services Digital Network User Part) call control signal.
[Fourth form]
In the gateway device according to any one of the first to third aspects,
When the connected gateway device is a gateway device on a mobile IP network, the conversion unit transmits / receives a videophone multiplexed signal transmitted / received to / from a mobile terminal and a gateway device on the mobile IP network. Gateway device that performs mutual conversion between a video stream and an audio stream.
[Fifth embodiment]
In the gateway device according to any one of the first to fourth aspects,
The mobile IP network is a gateway device that is a mobile LTE / EPC network.
[Sixth embodiment]
(Refer to the mobile circuit switching network from the second point of view)
[Seventh form]
(Refer to the audio data relay method from the third viewpoint above)
[Eighth form]
(Refer to the program from the fourth viewpoint above.)
Each disclosure of the above patent document is incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiment can be changed and adjusted based on the basic technical concept. Various combinations and selections of various disclosed elements are possible within the scope of the claims of the present invention. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

110, 110b, 210, 210b Gateway device 120, 120b, 150, 220, 220b, 280 Mobile terminal 130, 130b Mobile circuit switching network 131 IMS network 132 PSTN network 133 PSTN gateway device 135, 135b Radio base station controller (RNC)
137 CSCF device 138 eNodeB device 139 S-GW
140 Mobile LTE / EPC network 160 Call control / conversion unit 250, 350 Conversion unit 176, 276 Packet transmission / reception unit 180 Control / analysis unit 190 Protocol switching unit 200 IuUP protocol decomposition / assembly unit 240 223 transceiver 290 H.264. 223 protocol switching unit

Claims (8)

A conversion unit that switches a protocol to be used for connection based on a determination result of determining whether a connection destination gateway device is a gateway device on a mobile IP network or a gateway device on another mobile circuit switching network; Prepared,
A gateway device that interconnects a mobile terminal connected to a radio base station control device on its own side and a mobile terminal connected to a network to which the gateway device of the connection destination belongs and relays voice data.   The gateway device according to claim 1, wherein the conversion unit performs predetermined protocol conversion even when the gateway device of the connection destination is a PSTN gateway device on a public switched telephone network (PSTN).   The gateway apparatus according to claim 1, further comprising an analysis unit that determines a type of the connection destination gateway based on an analysis result of an ISUP (Integrated Services Digital Network User Part) call control signal.   When the gateway device of the connection destination is a gateway device on a mobile IP network, the conversion unit includes a videophone multiplexed signal to be transmitted / received to / from a mobile terminal connected to the radio base station control device on the own device side, The gateway device according to any one of claims 1 to 3, which performs mutual conversion between a video stream and an audio stream transmitted to and received from a gateway device on a mobile IP network.   The gateway apparatus according to claim 1, wherein the mobile IP network is a mobile LTE / EPC network.   A mobile circuit switching network comprising: the gateway device according to claim 1; and a radio base station control device that relays voice data between the gateway device and a mobile terminal connected to the gateway device. A gateway device that interconnects a gateway device on a mobile IP network and a radio base station control device on a mobile circuit switching network to which the device belongs, and relays voice data,
Determining a type of gateway device to be connected, including whether it is a gateway device on a mobile IP network or a gateway device on another mobile circuit switched network;
Switching the protocol used for connection according to the determined connection destination, and relaying the voice data. A program that interconnects a gateway device on a mobile IP network and a radio base station control device on a mobile circuit switching network to which the device belongs, and that is executed by a computer that configures a gateway device that relays voice data,
A process of determining the type of gateway device to be connected, including whether it is a gateway device on a mobile IP network or a gateway device on another mobile circuit switched network;
A program for causing the computer to execute a process of switching a protocol used for connection and relaying audio data according to the determined connection destination.

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