WO2016152095A1

WO2016152095A1 - Network device, base station, communication system, bearer establishing method, communication method, and non-transitory computer-readable medium

Info

Publication number: WO2016152095A1
Application number: PCT/JP2016/001485
Authority: WO
Inventors: 佳彦星野; 康弘渡辺; 洵也岡部
Original assignee: 日本電気株式会社
Priority date: 2015-03-20
Filing date: 2016-03-15
Publication date: 2016-09-29
Also published as: JP2016178484A

Abstract

The objective of the present invention is to provide a network device with which it is possible to reduce transport delays in a mobile network. The network device (30) according to the present invention is provided with: a base station identifying unit (31) which, when a communication terminal (20) is communicating with another communication terminal, identifies identification information of an incoming-side base station to which the other communication terminal is connected via a radio circuit; and a communication unit (32) which transmits the identification information of the incoming-side base station identified by the base station identifying unit (31) to an originating-side base station (10) which is attempting to establish with the incoming-side base station a communication bearer used by the communication terminal (20) for transmitting and receiving user data to and from the other communication terminal.

Description

Network device, base station, communication system, bearer establishment method, communication method, and non-transitory computer-readable medium

The present invention relates to a network device, a base station, a communication system, a bearer establishment method, a communication method, and a program, and more particularly to a network device, a base station, a communication system, a bearer establishment method, a communication method, and Regarding the program.

When performing wireless communication between wireless communication terminals such as mobile phone terminals, communication is performed via a mobile network managed by a mobile communication carrier. For example, the mobile network is configured by node devices that execute functions and operations defined in 3GPP (3rd Generation Generation Partnership Project). Examples of node devices that execute functions and operations defined in 3GPP include eNB (evolved Node B), SGW (Serving Gateway), and PGW (Packet Data Network Gateway). In communication between mobile phone terminals, voice data, text data, image data, or the like is transmitted / received via the eNB, SGW, and PGW.

Non-Patent Document 1 describes a process (Attach) in which a UE (User Equipment) used as a generic term for a mobile phone terminal or the like in 3GPP is connected to a mobile network and a route for transmitting and receiving data is set in the mobile network (Attach) Processing).

However, when performing the procedure disclosed in Non-Patent Document 1 and performing communication between UEs, data is often transmitted and received via SGW and PGW even when the distance between UEs is short . However, PGWs and the like are often concentrated in a specific area. Therefore, even when the distance between the UEs is short, data that is actually transmitted and received is transmitted via a plurality of node devices in the mobile network including the PGW arranged in a region away from the UE. Therefore, there is a problem that transmission delay increases even when the distance between UEs is short.

An object of the present invention is to provide a network device, a base station, a communication system, a bearer establishment method, a communication method, and a program that can reduce transmission delay in a mobile network.

The network device according to the first aspect of the present invention provides a terminating base station to which the second communication terminal is connected via a wireless line when the first communication terminal communicates with the second communication terminal. The first communication terminal receives the identification information of the base station specifying unit for specifying the identification information of the receiving side and the identification information of the base station of the receiving side specified by the base station specifying unit with the base station of the receiving side. And a communication unit that transmits to a transmitting base station that attempts to establish a communication bearer used for transmitting / receiving user data to / from two communication terminals.

The base station according to the second aspect of the present invention provides a receiving base station to which the second communication terminal is connected via a wireless line when the first communication terminal communicates with the second communication terminal. The first communication terminal communicates the second communication between the first communication unit that receives the identification information of the called base station and the called base station from the network device that has identified the identification information. A determination unit that determines whether or not a communication bearer used for transmitting and receiving user data to and from a terminal can be established; and when the determination unit determines that the communication bearer can be established A second communication unit that transmits / receives a control message for establishing the communication bearer to / from the terminating base station and transmits / receives the user data via the established communication bearer. .

A communication system according to a third aspect of the present invention provides a terminating base station to which the second communication terminal is connected via a wireless line when the first communication terminal communicates with the second communication terminal. The first communication terminal is connected to the second communication terminal between the receiving base station and a network device that identifies the receiving base station and transmits the receiving base station identification information to the transmitting base station. A communication bearer used for transmitting and receiving user data can be established, and when the communication bearer can be established, between the receiving base station and the A transmission-side base station that transmits / receives a control message for establishing a communication bearer and transmits / receives the user data via the established communication bearer.

The bearer establishment method according to the fourth aspect of the present invention provides a terminating base to which the second communication terminal is connected via a radio line when the first communication terminal communicates with the second communication terminal. Station identification information is identified, and the identification information of the identified receiving base station is stored in the user data between the first communication terminal and the second communication terminal. Is transmitted to the originating base station attempting to establish a communication bearer used to transmit / receive.

A communication method according to a fifth aspect of the present invention provides a receiving-side base station to which the second communication terminal is connected via a radio line when the first communication terminal communicates with the second communication terminal. The identification information of the receiving base station is received from the network device that specified the identification information of the first communication terminal, and the first communication terminal is connected to the second communication terminal between the first communication terminal and the user. To determine whether or not a communication bearer used for transmitting and receiving data can be established, and to establish the communication bearer with the receiving base station when the communication bearer can be established The user data is transmitted / received via the established communication bearer.

When the first communication terminal communicates with the second communication terminal, the program according to the sixth aspect of the present invention is a program for a receiving base station to which the second communication terminal is connected via a wireless line. The identification information is specified, and the identification information of the specified receiving base station is transmitted to and received from the receiving base station. The first communication terminal transmits and receives user data to and from the second communication terminal. The computer is caused to perform transmission to an originating base station attempting to establish a communication bearer used for the purpose.

According to the present invention, it is possible to provide a network device, a base station, a communication system, a bearer establishment method, a communication method, and a program that can reduce transmission delay in a mobile network.

1 is a configuration diagram of a communication system according to a first exemplary embodiment; FIG. 3 is a configuration diagram of a communication system according to a second exemplary embodiment. It is a block diagram of MME concerning Embodiment 2. FIG. It is a block diagram of eNB concerning Embodiment 2. FIG. It is a figure explaining the outline | summary about the communication bearer establishment process in the communication between eNBs concerning Embodiment 2. FIG. It is a figure explaining the establishment process of the detailed communication bearer concerning Embodiment 2. FIG.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. A configuration example of a communication system according to the first exemplary embodiment of the present invention will be described with reference to FIG. The communication system in FIG. 1 includes a transmission-side base station 10, a mobile communication terminal 20, and a network device 30. The mobile communication terminal 20 may be a mobile phone terminal, a computer device, or the like, for example, a mobile phone terminal or a smartphone. A computer device is a device that operates when a processor executes a program stored in a memory.

The mobile communication terminal 20 performs radio communication with the caller base station 10 when performing call processing for communication with other mobile communication terminals. The mobile communication terminal 20 performs wireless communication with the originating base station 10 according to a predetermined wireless communication method. For example, the mobile communication terminal 20 performs radio communication with the originating base station 10 according to LTE (Long Term Evolution) defined as a radio communication method used in 3GPP.

Subsequently, a configuration example of the network device 30 will be described. The network device 30 includes a base station specifying unit 31 and a communication unit (transmission / reception unit) 32. The base station specifying unit 31 and the communication unit 32 may be software or a module in which processing is executed when a processor executes a program stored in a memory. Or the base station specific | specification part 31 and the communication part 32 may be comprised by the circuit etc.

When the mobile communication terminal 20 communicates with another mobile communication terminal, the base station specifying unit 31 specifies the identification information of the called base station to which the other mobile communication terminal is connected via a wireless line. The base station specifying unit 31 outputs the identification information of the specified receiving base station to the communication unit 32. The identification information of the called base station may be, for example, an IP address, or may be identification information that uniquely identifies other called base stations in the network.

The base station specifying unit 31 may be, for example, a network device different from the network device 30 and may acquire the identification information of the receiving base station from a network device that manages the receiving base station. Alternatively, the base station specifying unit 31 may extract the identification information of the receiving base station from a database or the like stored in a memory or the like in its own device.

The communication unit 32 transmits the receiving base station identification information specified by the base station specifying unit 31 to the transmitting base station 10. The originating base station 10 attempts to establish a communication bearer used by the mobile communication terminal 20 to transmit / receive user data to / from other mobile communication terminals with the receiving base station. The caller base station 10 attempts to establish a communication bearer with the callee base station using the callee base station identification information output from the base station specifying unit 31.

User data may be voice data, text data, image data, or the like, for example. The user data may be referred to as U (User) -Plane data. Further, there is control data as data of a different type from user data. The control data is, for example, data used when the originating base station 10 establishes a communication bearer with the terminating base station, or the originating base station transmitted from the network device 30 to the originating base station 10 10 may be data in which the identification information of the receiving base station is set to 10. The control data may be referred to as C (Control) -Plane data.

As described above, the network device 30 transmits the identification information of the called base station to the calling base station 10, so that the calling base station 10 establishes a communication bearer with the called base station. Can try. If the originating base station 10 can establish a communication bearer with the terminating base station, user data transmitted / received between the mobile communication terminal 20 and another mobile communication terminal is transmitted to the terminating base station. Are transmitted and received via a communication bearer established between the two.

Data transmitted / received between the mobile communication terminal 20 and other mobile communication terminals is transmitted / received between the base stations, so that the data does not pass through a gateway device or the like, which is a higher-level device of the base station. The number of devices that pass through can be reduced. As a result, data transmission delay can be reduced.

(Embodiment 2)
Subsequently, a configuration example of the communication system according to the second exemplary embodiment of the present invention will be described with reference to FIG. The communication system of FIG. 2 shows a network configuration defined in 3GPP. 2 includes a UE 50, an eNB 60, an SGW 70, a PGW 80, an MME (Mobility Management Entity) 90, a PCRF (Policy and Charging Rules Function) 100, an HSS (Home Subscriber Server) 110, an IMS (IP Multimedia Subsystem) device 120, It has UE150, eNB160, SGW170, PGW180, MME190, PCRF200, and HSS210.

UE 50 and UE 150 are generic names of mobile communication terminals in 3GPP. The UE 50 and the UE 150 correspond to the mobile communication terminal 20 in FIG. The eNB 60 and the eNB 160 are base stations that can execute LTE (Long Termination Evolution) as a radio communication scheme. SGW70, SGW170, PGW80, and PGW180 are the apparatuses which relay or transmit the user data regarding UE50 and UE150. The MME 90 performs call processing control related to the UE 50. Further, the MME 190 performs call processing control regarding the UE 150.

The PCRF 100 and the PCRF 200 perform charging control and path control according to the network policy. The HSS 110 holds subscriber data of the UE 50. Also, the HSS 210 holds subscriber data of the UE 150. The SGW 70, SGW 170, PGW 80, PGW 180, MME 90, MME 190, PCRF 100, PCRF 200, HSS 110, and HSS 210 correspond to the network device 30 in FIG.

The IMS device 120 performs call control when mainly performing voice communication using SIP (Session Initiation Protocol). IMS device 120 may be, for example, a P-CSCF (Proxy-Call Session Control Function) device or an S-CSCF (Serving-Call Session Control Function) device.

Further, in FIG. 2, UE 50 is a UE that performs outgoing calls, and UE 150 is a UE that performs incoming calls. Also, the eNB 60, the SGW 70, the PGW 80, the MME 90, the PCRF 100, and the HSS 110 are assumed to be node devices that mainly execute processing on the UE 50 side. Also, the eNB 160, the SGW 170, the PGW 180, the MME 190, the PCRF 200, and the HSS 210 are assumed to be node devices that mainly execute processing on the UE 150 side.

FIG. 2 shows a configuration in which two node devices exist, but for example, the MME 90 and the MME 190 may be the same node device. That is, the MME 90 may execute processing related to the UE 50 and the UE 150. The other two existing node devices may be the same node device.

Subsequently, a configuration example of the MME 90 according to the second exemplary embodiment of the present invention will be described with reference to FIG. Since the MME 190 has the same configuration as the MME 90, detailed description thereof is omitted. The MME 90 includes a core network communication unit (transmission / reception unit) 91, a base station identification unit 92, and a base station communication unit 93. Each component constituting the MME 90 may be software, a module, or the like that is executed when the processor executes a program stored in the memory. Or each component which comprises MME90 may be comprised by a circuit etc.

The core network communication unit 91 communicates with the SGW 70, the HSS 110, and the MME 190. Specifically, the core network communication unit 91 transmits / receives control data to / from the SGW 70, the HSS 110, and the MME 190.

The base station specifying unit 92 performs the same functions and operations as the base station specifying unit 31 of FIG. Further, the base station communication unit 93 communicates with the eNB 60. Specifically, the base station communication unit 93 transmits and receives control data to and from the eNB 60. Also, the base station communication unit 93 performs the same functions and operations as the communication unit 32 of FIG.

Then, the structural example of eNB60 concerning Embodiment 2 of this invention is demonstrated using FIG. A core network communication unit 61, a determination unit 62, and a base station communication unit 63 are provided. Each component constituting the eNB 60 may be software, a module, or the like that is processed by the processor executing a program stored in the memory. Or each component which comprises eNB60 may be comprised by a circuit etc.

The core network communication unit 61 communicates with the SGW 70 and the MME 90. The core network communication unit 61 mainly transmits / receives user data to / from the SGW 70 and mainly transmits / receives control data to / from the MME 90. When the UE 50 transmits and communicates with the UE 150, the core network communication unit 61 receives the identification information of the eNB 160, which is the eNB on the receiving side, from the MME 90. The core network communication unit 61 outputs the received identification information of the eNB 160 to the determination unit 62.

The determination unit 62 determines whether a communication bearer can be established with the eNB 160 identified by the identification information output from the core network communication unit 61. For example, the determination unit 62 determines whether or not communication with the eNB 160 is possible via the X2 interface defined in 3GPP. The determination unit 62 may determine whether or not the eNB 160 is connected via an optical communication line or another communication line. When eNB 60 and eNB 160 are connected via an optical line or the like, a communication bearer in the X2 interface can be set by transmitting / receiving control data defined in 3GPP between eNB 60 and eNB 160 .

For example, the list information of the eNB that can communicate with the eNB 60 via the X2 interface or the eNB that is connected via the optical communication line or other communication line is stored in the memory or the like in the eNB 60 It may be. The determination unit 62 may determine whether a communication bearer can be established with the eNB 160 using eNB list information stored in a memory or the like.

When the determination unit 62 determines that the communication bearer can be established with the eNB 160, the base station communication unit 63 performs the process of establishing the communication bearer with the eNB 160. Specifically, the base station communication unit 63 transmits / receives a control message for establishing a communication bearer to / from the eNB 160. Further, when establishing a communication bearer with the eNB 160, the base station communication unit 63 transmits user data destined for the UE 150 transmitted from the UE 50 to the eNB 160 via the communication bearer established with the eNB 160. Moreover, eNB60 transmits the user data destined for UE50 transmitted from eNB160 via the communication bearer established between eNB160 to UE50.

Then, the outline | summary about the communication bearer establishment process in the communication between eNBs concerning Embodiment 2 of this invention is demonstrated using FIG. 5 is a communication system including SGW 70, PGW 80, MME 90, PCRF 100, HSS 110, and the like. FIG. 5 shows processing related to the UE 50, and illustration of processing related to the UE 150 is omitted. Although not shown in FIG. 5, it is assumed that the same processing is executed in the UE 150.

First, the UE 50 executes an Attach process with the EPC in order to connect to the EPC when the power is turned on (S11). When the Attach process between the UE 50 and the EPC is completed, a default bearer is set between the UE 50 and the eNB 60 and between the eNB 60 and the EPC. For example, the default bearer is used for sending and receiving SIP messages between the UE 50 and the IMS device 120.

Next, the UE 50 executes a registration process in the IMS device 120 by transmitting a SIP Register message to the IMS device 120 (S12). For example, when the UE 50 registers an IP address or the like in the P-CSCF, the S-CSCF, or the like, the IMS device 120 such as the P-CSCF or the S-CSCF can execute call processing using SIP.

Subsequently, the UE 50 executes a call origination process by transmitting a SIP INVITE message to the IMS device 120 in order to perform voice communication with the UE 150 (S13). Specifically, the UE 50 sets the IP address and the port number assigned to the own device in the SIP INVITE message, and transmits the SIP INVITE message to the UE 150 via the IMS device 120. Moreover, UE50 receives the response message with respect to the SIP | INVITE message transmitted from UE150. An IP address and a port number assigned to the UE 150 are set in the response message. That is, UE 50 and UE 150 exchange each other's IP address and port number by executing the SIP transmission process in step S13.

In addition, the UE 50 sets a dedicated bearer for voice communication between the UE 50 and the eNB 60 and between the eNB 60 and the EPC by performing the SIP transmission process.

Next, the eNB 60 and the MME 90 execute a communication bearer setting process for user data between the eNB 60 and the eNB 160 (S14). The communication bearer setting process in step S14 will be described in detail with reference to FIG.

First, when the SIP transmission process in the UE 50 is executed, the IMS device 120 transmits an RX request message to the PCRF 100 via the RX interface defined in 3GPP (S21). The IMS device 120 sets, in the RX request message, that the UE 50 is the calling side, the IP address of the UE 50, the IP address of the UE 150 that is the receiving side, and the MSISDN (telephone number) of the UE 150.

Next, the PCRF 100 transmits a Re Auth Request (RAR) message to the PGW 80 (S22). The PCRF 100 sets the information set in the RX request message in the RAR message. Next, the PGW 80 transmits a GTP (General packet packet service) Tunneling protocol) to the SGW 70, and transmits a GTPv2 Update message to the MME 90 (S23). The PGW 80 and the SGW 70 set the information set in the RAR message in the UB Request message.

Next, the MME 90 sends a UB Response message to the SGW 70 as a response to the UB Request message, and the SGW 70 sends a UB Response message to the PGW 80 as a response to the UB Request message. Next, the PGW 80 transmits a Credit Control Request (CCR) message to the PCRF 100 as a response to the RAR message.

Next, the MME 90 specifies the HSS 210 in which the subscriber information related to the UE 150 is stored from the MSISDN of the UE 150 set in the UB Request message in Step S23. When the MME 90 specifies the HSS 210 in which the subscriber information regarding the UE 150 is stored, the MME 90 transmits a Query message to the HSS 210 (S26). The MME 90 transmits a Query message to the HSS 210 in order to inquire the MME in which the subscriber information of the UE 150 is registered, that is, the MME that manages the location information of the UE 150. The MME 90 sets the MSISDN of the UE 150 in the Query message.

The HSS 210 transmits an Answer message in which the identification information of the MME 190 in which the subscriber information of the UE 150 is registered and the IMSI (International Mobile Subscriber Identity) of the UE 150 is set to the MME 90 (S27).

Next, the MME 90 transmits a Request message to the MME 190 using the identification information of the MME 190 notified in step S27 (S28). The MME 90 sets the IMSI of the UE 50, the MSISDN of the UE 50, the IP address of the UE 50, and the IMSI of the UE 150 in the Request message.

Next, the MME 190 executes an authentication process regarding whether or not to transmit information regarding the eNB to which the UE 150 is connected to the MME 90 (S29). Here, the MME 190 is the same as the MME 90 in the procedure of steps S21 to S25, in which the MME 90 is notified of the UE 50 being the originating side, the IP address of the UE 50, the IP address of the UE 150 being the terminating side, and the MSISDN of the UE 150. It is assumed that the UE 150 is notified of the incoming side, the IP address of the UE 150, the IP address of the UE 50 that is the outgoing side, and the MSISIDN of the UE 50. Specifically, it is assumed that processing similar to steps S21 to S25 is also executed between the IMS device 120 and the MME 190 via the SGW 170, the PGW 180, and the PCRF 200.

For example, when the IP address and MSISDN of the UE 50 transmitted from the IMS device 120 in advance match the IP address and MSISDN of the UE 50 set in the Request message in step S28, the MME 190 is connected to the MME 90. You may determine that the information regarding eNB can be transmitted.

When the MME 190 determines that the information about the eNB to which the UE 150 is connected can be transmitted to the MME 90, the MME 190 transmits a Response message in which information about the eNB 160 to which the UE 150 is connected is set to the MME 90 (S30). For example, the MME 190 sets the identification information of the eNB 160 and the information by which the MME 190 identifies call processing related to the UE 150 in the Response message. The information for identifying the call processing related to the UE 150 by the MME 190 may be, for example, the S1AP-ID used when the MME 190 executes the call processing related to the UE 150 with the eNB 160.

Next, the MME 90 transmits an address notification message to the eNB 60, and the eNB 60 transmits the received address notification message to the UE 50 (S31). The MME 90 sets the IP address of the UE 50, the IP address of the UE 150, the identification information of the eNB 160, the S1AP-ID related to the UE 150, and the E-RAB (E-UTRAN Radio Access Bearer) ID related to the UE 50 in the S1AP signal for notification to the eNB 60 To do. Further, the MME 90 sets the IP address of the UE 150 and the IMSI of the UE 150 in a NAS (Non-Access Stratum) signal for notification to the UE 50.

The E-RAB ID is information for identifying the bearer set when the UE 50 communicates with the eNB 60. When the eNB 60 is notified of the E-RAB ID, the user data transmitted / received to / from the UE 50 using the notified E-RAB ID is newly set between the eNB 60 and the eNB 160. Recognize that the data is sent and received by the bearer. That is, the eNB 60 outputs the notified user data regarding the E-RAB ID to a communication bearer newly set up with the eNB 160 instead of the dedicated bearer set up with the SGW 70. However, when a communication bearer is not set with the eNB 160, the eNB 60 outputs user data related to the notified E-RAB ID to the dedicated bearer set with the SGW 70.

Next, the eNB 60 determines whether or not a communication bearer for user data (U-Plane) can be established with the eNB 160 notified in step S31 (S32). If the eNB 60 determines that a communication bearer for user data can be established with the eNB 160, the eNB 60 transmits a Request message to the eNB 160 (S33). The eNB 60 sets the S1AP-ID related to the UE 150, the IP address of the UE 150, the IP address of the UE 50, and the resource number of the communication bearer that the eNB 60 establishes with the eNB 160 in the Request message.

When the eNB 160 is notified of the S1AP-ID related to the UE 150 in step S33, the user data transmitted / received to / from the UE 150 using the E-RAB ID associated with the S1AP-ID related to the UE 150 is changed to the eNB 60. It recognizes that it becomes the object of the data transmitted / received in the communication bearer newly set up between eNB160.

Next, the eNB 160 sets a resource number of a communication bearer that the eNB 160 newly establishes with the eNB 60. By executing the processes in steps S33 and S34, a communication bearer that transmits data transmitted and received between the UE 50 and the UE 150 is set between the eNB 60 and the eNB 160.

As described above, by using the communication system according to the second exemplary embodiment of the present invention, the MME 90 on the calling side can acquire information on the IP address and MSISDN of the UE 150 on the called side specified by the SIP communication. it can. Further, the MME 90 can specify the eNB 160 with which the UE 150 communicates by using the MSISDN of the UE 150. Thereby, eNB60 can set up the bearer for communication for communicating user data between eNB160.

User data transmitted / received between the UE 50 and the UE 150 is transmitted in a communication bearer set between the eNB 60 and the eNB 160, so that the number of node devices through which the user data passes can be reduced. As a result, the delay time caused by the user data transmitting through the mobile network can be shortened.

Further, user data transmitted / received between the UE 50 and the UE 150 is transmitted in a communication bearer set between the eNB 60 and the eNB 160, thereby reducing user data to be processed in the SGW and the PGW. Therefore, since a communication carrier or the like that manages the mobile network can reduce the number of SGW and PGW facilities, the cost related to the construction or management of the mobile network can be reduced.

Further, by executing the processes of FIGS. 5 and 6, the UE 50 can acquire information on the IP address, MSISDN, IMSI, and the like of the UE 150. Furthermore, the UE 150 can also acquire information regarding the IP address, MSISDN, IMSI, and the like of the UE 50. Thus, the UE 50 may perform ProSE (Proximity Services) communication with the UE 150 and perform communication without using the eNB 60 and the eNB 160. By performing ProSE communication, the UE 50 and the UE 150 can directly communicate with each other, so that the delay of user data can be further reduced.

In the above-described embodiment, the present invention has been described as a hardware configuration, but the present invention is not limited to this. The present invention can also realize processing in the MME, eNB, and other node devices by causing a CPU (Central Processing Unit) to execute a computer program.

In the above example, the program can be stored using various types of non-transitory computer-readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (Random Access Memory)) are included. The program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

The present invention has been described above with reference to the embodiment, but the present invention is not limited to the above. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the invention.

This application claims priority based on Japanese Patent Application No. 2015-057348 filed on March 20, 2015, the entire disclosure of which is incorporated herein.

DESCRIPTION OF SYMBOLS 10 Originating base station 20 Mobile communication terminal 30 Network apparatus 31 Base station specific | specification part 32 Communication part 50 UE
60 eNB
61 Core network communication unit 62 Determination unit 63 Base station communication unit 70 SGW
80 PGW
90 MME
91 Core network communication unit 92 Base station specifying unit 93 Base station communication unit 100 PCRF
110 HSS
120 IMS device 150 UE
160 eNB
170 SGW
180 PGW
190 MME
200 PCRF
210 HSS

Claims

When the first communication terminal communicates with the second communication terminal, the second communication terminal specifies base station specifying means for specifying identification information of a receiving base station connected via a wireless line;
The first communication terminal transmits / receives user data to / from the second communication terminal with the receiving base station identification information specified by the base station specifying means. And a communication means for transmitting to a caller base station attempting to establish a communication bearer used for communication.
The base station specifying means includes
Using the telephone number information of the second communication terminal specified by the SIP control, a receiving-side network device that executes call control processing of the second communication terminal is specified, and the receiving-side network device sends the call-receiving side The network device according to claim 1, which receives base station identification information.
The base station specifying means includes
Along with the identification information of the called base station, the second communication terminal receives the identification information of the wireless line used when connecting to the called base station,
The communication means includes
The network apparatus according to claim 2, wherein the wireless line identification information is transmitted to the transmitting base station.
When the first communication terminal communicates with the second communication terminal, the second communication terminal specifies the identification information of the receiving base station to be connected via a wireless line from the network device. First communication means for receiving base station identification information;
Determination to determine whether or not a communication bearer used for transmitting and receiving user data to and from the second communication terminal can be established with the receiving base station. Means,
When it is determined by the determination means that the communication bearer can be established, a control message for establishing the communication bearer is transmitted to and received from the receiving base station, and the established communication bearer is transmitted via the established communication bearer. And a second communication means for transmitting and receiving the user data.
The determination means includes
The base station according to claim 4, wherein the base station determines that the communication bearer can be established when connected to the destination base station via an X2 interface defined in 3GPP.
The first communication means includes
From the network device, the second communication terminal receives identification information of a wireless line used when connecting to the receiving base station,
The second communication means includes
The base station according to claim 4 or 5, wherein the identification information of the wireless line is transmitted to the receiving base station.
When the first communication terminal communicates with the second communication terminal, the second communication terminal specifies identification information of a called base station connected via a wireless line, and A network device that transmits identification information to the originating base station;
Determining whether or not a communication bearer used by the first communication terminal to transmit and receive user data to and from the second communication terminal can be established with the receiving base station; When the communication bearer can be established, transmission and reception of a control message for establishing the communication bearer with the receiving base station, and transmission and reception of the user data via the established communication bearer And a base station.
When the first communication terminal communicates with the second communication terminal, the second communication terminal specifies identification information of the called base station connected via the wireless line,
A communication bearer used by the first communication terminal to transmit / receive user data to / from the second communication terminal with the identified identification information of the receiving base station from / to the receiving base station. A bearer establishment method for transmitting to an originating base station attempting to establish
When the first communication terminal communicates with the second communication terminal, the second communication terminal specifies the identification information of the receiving base station to be connected via a wireless line from the network device. Receiving the identification information of the base station,
Determining whether or not a communication bearer used by the first communication terminal to transmit and receive user data to and from the second communication terminal can be established with the receiving base station;
When the communication bearer can be established, a control message for establishing the communication bearer with the receiving base station is transmitted and received,
A communication method for transmitting and receiving the user data via the established communication bearer.
When the first communication terminal communicates with the second communication terminal, the second communication terminal specifies identification information of the called base station connected via the wireless line,
A communication bearer used by the first communication terminal to transmit / receive user data to / from the second communication terminal with the identified identification information of the receiving base station from / to the receiving base station. A non-transitory computer readable medium having stored thereon a program for causing a computer to execute transmission to an originating base station attempting to establish a network.
When the first communication terminal communicates with the second communication terminal, the second communication terminal specifies the identification information of the receiving base station to be connected via a wireless line from the network device. Receiving the identification information of the base station,
Determining whether or not a communication bearer used by the first communication terminal to transmit and receive user data to and from the second communication terminal can be established with the receiving base station;
When the communication bearer can be established, a control message for establishing the communication bearer with the receiving base station is transmitted and received,
A non-transitory computer readable medium storing a program for causing a computer to execute transmission / reception of the user data via the established communication bearer.