WO2016147662A1

WO2016147662A1 - Pgw, sgw, bearer control method, bearer establishment method, and nontemporary computer-readable medium

Info

Publication number: WO2016147662A1
Application number: PCT/JP2016/001491
Authority: WO
Inventors: 創前佛; 寛之原田
Original assignee: 日本電気株式会社
Priority date: 2015-03-17
Filing date: 2016-03-15
Publication date: 2016-09-22
Also published as: JP2016174286A

Abstract

The purpose of the present invention is to provide a packet data gateway (PGW), a serving gateway (SGW), a bearer control method, a bearer establishment method, and a program that do not require time for the process to change a PGW used by user equipment (UE). A source PGW (10) according to the present invention is provided with: a detection unit (11) for detecting changes in the communication state pertaining to a mid-communication communication terminal; a determination unit (12) that, when a change in the communication state is detected by the detection unit (11), determines a target PGW (20) for executing communication pertaining to the mid-communication communication terminal via the device, in place of the device; and a communication unit (13) for transmitting a message to an SGW (30) instructing that a first bearer pertaining to the communication terminal is to be established between the target PGW (20) and the SGW (30).

Description

PGW, SGW, bearer control method, bearer establishment method, and non-transitory computer-readable medium

The present invention relates to a PGW (Packet Data Network Gateway), an SGW (Serving Gateway), a bearer control method, a bearer establishment method, and a program.

When a UE (User Equipment) communicates with an external network in accordance with an operation defined in 3GPP (3rd Generation Partnership Project), the UE communicates with the external network via a PGW (Packet Data Network Gateway). UE is used as a general term for communication terminals in 3GPP. The PGW is used as a gateway when communicating with an external network.

When a UE communicates with an external network while attaching to a mobile network that performs an operation defined in 3GPP, the UE communicates with the external network via the same PGW. Non-Patent Document 1 discloses an operation related to UE Attach processing.

However, when multiple UEs communicate with an external network using the same PGW, if the communication volume of some UEs increases, the amount of communication that can be communicated by other UEs may decrease. May have an effect. Therefore, there is a demand for dynamic shift of bearers related to UEs such as accommodating UEs with a large amount of communication in other PGWs. However, when the bearer related to the UE is transferred to another PGW, it is necessary to cause the UE to detach once by the network initiative and then re-attach to the new PGW. In this case, there is a problem that it takes time for the reconnection process associated with the reattachment of the UE.

An object of the present invention is to provide a PGW, an SGW, a bearer control method, a bearer establishment method, and a program that do not require time for changing the PGW used by the UE.

The PGW according to the first aspect of the present invention includes: a detection unit that detects a change in a communication state related to a communication terminal that is in communication; and a communication unit that performs communication when the change in the communication state is detected in the detection unit. A determination unit that determines a target PGW to be executed on behalf of the own device, and a communication unit that transmits a message to the SGW to instruct to establish a first bearer related to the communication terminal with the target PGW, It is to be prepared.

The SGW according to the second aspect of the present invention is configured to execute communication related to the communication terminal communicating via the source PGW on behalf of the source PGW due to a change in the communication state related to the communication terminal in communication. A communication unit that receives a message instructing to establish a first bearer related to the communication terminal with the target PGW from the source PGW that has determined the message, and when receiving the message, A bearer control unit that establishes the first bearer.

The bearer control method according to the third aspect of the present invention detects a change in a communication state related to a communication terminal in communication. When a change in a communication state is detected, the communication of the communication terminal is performed on behalf of the own device. A target PGW to be executed is determined, and a message instructing to establish a first bearer related to the communication terminal with the target PGW is transmitted to the SGW.

The bearer establishment method according to the fourth aspect of the present invention executes communication related to a communication terminal communicating via the source PGW on behalf of the source PGW due to a change in the communication state related to the communication terminal currently communicating. A message indicating that a first bearer related to the communication terminal is established with the target PGW is received from the source PGW that has determined the target PGW, and when the message is received, the message is received between the target PGW and the target PGW. A first bearer is established.

A program according to a fifth aspect of the present invention detects a change in a communication state related to a communication terminal in communication, and executes a communication of the communication terminal on behalf of its own device when a change in the communication state is detected. The target PGW is determined, and the computer is caused to transmit a message instructing to establish a first bearer related to the communication terminal with the target PGW to the SGW.

According to the present invention, it is possible to provide a PGW, an SGW, a bearer control method, a bearer establishment method, and a program that do not require time to change the PGW used by the UE.

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 PGW concerning Embodiment 2. FIG. It is a block diagram of SGW concerning Embodiment 2. FIG. It is a figure which shows the flow of the change destination PGW determination process concerning Embodiment 2. FIG. It is a figure which shows the flow of the session establishment process between SGW and target PGW concerning Embodiment 2. FIG. It is a figure which shows the flow of the session establishment process between source PGW and target PGW concerning Embodiment 2. FIG. FIG. 10 is a diagram illustrating a flow of uplink data path switching processing according to the second exemplary embodiment; It is a figure which shows the transfer path | route of the uplink data and downlink data concerning Embodiment 2. FIG. FIG. 10 is a diagram illustrating a flow of downlink data path switching processing according to the second exemplary embodiment; It is a figure which shows the transfer path | route of the uplink data and downlink data concerning Embodiment 2. FIG. It is a figure which shows the flow of the deletion process of the unnecessary bearer concerning Embodiment 2. FIG.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. First, 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 source PGW 10, a target PGW 20, and an SGW (Serving Gateway) 30. The source PGW 10, the target PGW 20, and the SGW 30 may be computer devices that operate when a processor executes a program stored in a memory.

Subsequently, a configuration example of the source PGW 10 will be described. The source PGW 10 includes a detection unit 11, a determination unit 12, and a communication unit (transmission / reception unit) 13. Each component that configures the source PGW 10 may be software or a module that executes processing when a processor executes a program stored in a memory. Or each component which comprises source PGW10 may be constituted by a circuit etc.

The detecting unit 11 detects a change in the communication state related to the communication terminal that is communicating. “Communicating” means, for example, receiving data destined for the communication terminal and transmitting the received data to the communication terminal, or receiving data transmitted from the communication terminal and transferring the received data to an external network or the like. It may be to transmit.

The communication state may be, for example, a data transfer amount, a packet loss number (packet discard number), a transfer rate, or the like. The change in the communication state is, for example, that the data transfer amount related to a certain communication terminal exceeds a predetermined threshold, the number of packet losses in communication of a certain communication terminal exceeds a predetermined threshold, or in a certain communication terminal When GBR (Guaranteed Bit Rate) is determined, the transfer rate may exceed GBR, or the like. The change in the communication state may be a change in a radio communication method (RAT: Radio Access Technology).

The detection unit 11 may detect a change in the communication state within the device itself, or may detect a change in the communication state by receiving information detected by an external server or the like. Moreover, the detection part 11 may detect the information acquirable in DPI (Deep | Packet | Inspection). The information that can be acquired in the DPI may be, for example, the type of data indicating whether it is text or video, or whether the destination is a specific server. Furthermore, the detection unit 11 may detect communication for a specific application.

When the detection unit 11 detects a change in the communication state, the determination unit 12 determines a target PGW 20 that executes communication of the communication terminal whose communication state has changed instead of the source PGW 10.

The determining unit 12 may determine, as the target PGW 20, a PGW in which the data transfer amount or the number of packet loss of the entire apparatus has not yet reached a predetermined threshold. The status of communication states related to a plurality of PGWs may be notified between PGWs, or may be collectively managed by an external server or the like.

The communication unit 13 transmits to the SGW 30 a message instructing to establish a bearer related to the communication terminal to be migrated between the SGW 30 and the target PGW 20. The bearer may be, for example, a data transfer path determined for each communication terminal. The data transfer path may be paraphrased as, for example, a data transmission path, a data relay path, or a data transfer tunnel.

As described above, by using the communication system of FIG. 1, the source PGW 10 instructs the current communication terminal to establish a bearer regarding a communication terminal to be migrated with the target PGW 20 to the SGW 30. The set bearer can be changed. In other words, the source PGW 10 can change the bearer of the communication terminal without detaching the communication terminal in the Attach state. Since the communication terminal does not need to execute the process associated with the reattach, it is possible to avoid the occurrence of a switching time or the like accompanying the change of the data transmission path.

(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 shown in FIG. 2 is mainly composed of node devices that execute operations defined in 3GPP. 2 includes a UE 40, an eNB (evolved NodeB) 50, an SGW (Serving Gateway) 60, a source PGW 70, a target PGW 80, an SCS (Service Capability Server) 90, a PCRF (Policy and Charging Rule Function) 100, and a traffic collection device. 110 and the Internet 120.

The source PGW 70 corresponds to the source PGW 10 in FIG. 1, and the target PGW 80 corresponds to the target PGW 20 in FIG. The SGW 60 corresponds to the SGW 30 in FIG.

UE 40 is used as a general term for communication terminals in 3GPP. The eNB 50 is a base station that can use LTE (Long Term Term Evolution) defined in 3GPP as a radio communication scheme.

The SGW 60 relays user data transmitted and received between the eNB 50 and the source PGW 70 or the target PGW 80. The user data may be referred to as U-Plane data, for example. The source PGW 70 and the target PGW 80 relay user data transmitted and received between the SCS 90 and the SGW 60. User data is also transmitted between the source PGW 70 and the target PGW 80.

The SCS 90 is a device on which an M2M application used for realizing, for example, M2M (Machine to Machine) communication is mounted. For example, the SCS 90 communicates with an application server arranged on the Internet 120 and relays user data transmitted and received between the application server and the source PGW 70 or the target PGW 80. Further, the SCS 90 may communicate with devices arranged in a closed network in addition to the Internet, which is an open network. Instead of the SCS 90, AGW (Access Gateway) or TDF (Traffic Detection Function), Radius, Router, or the like may be used.

The PCRF 100 is a device that performs policy control, charging control, and the like in a network configured by the eNB 50, the SGW 60, the source PGW 70, the target PGW 80, and the SCS 90.

The traffic collection device 110 is a device that manages the traffic of the source PGW 70 and the target PGW 80. For example, the traffic collection device 110 may manage the amount of data transmitted / received in the source PGW 70 and the target PGW 80, or the number of packet losses in the source PGW 70 and the target PGW 80.

The Internet 120 is an external network different from the mobile network configured by the eNB 50, the SGW 60, the source PGW 70, the target PGW 80, the SCS 90, the PCRF 100, and the traffic collection device 110. A plurality of application servers and the like may be arranged on the Internet 120.

Subsequently, a configuration example of the source PGW 70 according to the second embodiment of the present invention will be described with reference to FIG. The source PGW 70 in FIG. 3 has a configuration in which a switching instruction unit 71 is added to the source PGW 10 in FIG. In the source PGW 70, detailed description of the same configuration as that of the source PGW 10 in FIG. 1 is omitted.

The switching instruction unit 71 transmits, via the communication unit 13, a message instructing the SGW 60 to transmit data related to the UE 40 to be transmitted to the source PGW 70 to the target PGW 80. Assume that a bearer is established between the SGW 60 and the target PGW 80.

Furthermore, the switching instruction unit 71 transmits a message for instructing the SCS 90 to transmit data related to the UE 40 to be transmitted to the source PGW 70 to the target PGW 80 via the communication unit 13.

The switching instructing unit 71 can transfer the data transfer processing related to the UE 40 to the target PGW 80 by transmitting a message instructing the SGW 60 and the SCS 90 to transmit data to be transmitted to the source PGW 70 to the target PGW 80. . As a result, the source PGW 70 does not perform the data transfer process on the UE 40, and thus the processing load can be reduced. Further, when viewed as the entire communication system, the processing loads on the source PGW 70 and the target PGW 80 can be leveled. In this figure, the interface between the PCRF 100 and the traffic collection device 110 is not shown.

Subsequently, a configuration example of the SGW 60 according to the second embodiment of the present invention will be described with reference to FIG. The SGW 60 includes a communication unit 61 and a control unit 62. The communication unit 61 receives from the source PGW 70 a message instructing to establish a bearer related to the communication of the UE 40 with the target PGW 80. Further, the communication unit 61 receives from the source PGW 70 a message instructing transmission of data related to the UE 40 to be transmitted to the source PGW 70 to the target PGW 80. The communication unit 61 transmits / receives user data to / from the source PGW 70 and the target PGW 80.

When the control unit 62 receives a message instructing to establish a bearer regarding the UE 40 with the target PGW 80 via the communication unit 61, the control unit 62 executes a process of establishing a bearer with the target PGW 80. Furthermore, when the control unit 62 receives a message instructing transmission of data related to the UE 40 to be transmitted to the source PGW 70 to the target PGW 80, the control unit 62 sets the destination of the data transmitted from the UE 40 as the target PGW 80.

Further, in this figure, the illustration of the interface between the PCRF 100 and the eNB 50 is omitted.

Subsequently, a flow of processing for determining a change destination PGW according to the second embodiment of the present invention will be described with reference to FIG. First, the source PGW 70 detects a change in the communication state of the UE 40 (S11). For example, the source PGW 70 may determine that the communication state of the UE 40 has changed when the transfer amount of data related to the UE 40 exceeds a predetermined threshold. The data transfer amount may be a data amount at which the source PGW 70 transmits and receives data related to the UE 40. The source PGW 70 may detect a change in the communication state of the UE 40 using, for example, a DPI function. The DPI function is a function for analyzing a user packet.

Further, the source PGW 70 may detect a change in the communication state in consideration of the data transfer amount of the entire apparatus together with the data transfer amount for each UE. For example, the source PGW 70 determines that the communication state has not changed when the data transfer amount of a certain UE 40 exceeds the threshold but does not exceed the data amount that can be transferred by the own device. May be. In other words, it may be determined that the communication state has changed when the data transfer amount of each UE 40 exceeds a predetermined threshold value and the data transfer amount of the entire apparatus also exceeds the predetermined threshold value.

Next, the source PGW 70 transmits a PGW change notification message to the traffic collection device 110 in order to inquire about communication resources, that is, a PGW having a sufficient data transfer amount as the entire device (S12). The source PGW 70 may set information on the data transfer amount to be transferred to the target PGW in the PGW change notification message. The traffic collection device 110 may be, for example, an operation device or the like, and is assumed to acquire information on the data transfer amount from each PGW in real time or periodically.

When the traffic collection device 110 receives the PGW change notification message, the traffic collection device 110 extracts PGWs having sufficient communication resources. For example, the traffic collection device 110 may select a PGW whose data transfer amount does not reach a predetermined threshold as the target PGW. Alternatively, the traffic collection device 110 may select, as the target PGW, a PGW that does not reach a predetermined threshold as the data transfer amount of the entire device even if the data transfer amount transferred by the source PGW 70 is added.

When selecting the target PGW, the traffic collection device 110 transmits a target PGW notification message to the source PGW 70 in order to notify the source PGW 70 of the selected target PGW (S13).

Subsequently, a flow of bearer establishment processing between the SGW 60 and the target PGW 80 according to the second embodiment of the present invention will be described with reference to FIG. The bearer establishment process may be rephrased as a session establishment process.

First, when the source PGW 70 receives information on the target PGW 80 that executes data transfer processing on the UE 40 instead of the own device in step S13 of FIG. 5, the source PGW 70 transmits a PGWPGRelocation Request message to the SGW 60 (S21). The source PGW 70 sets identification information, address information, and the like of the target PGW 80 in the PGW Relocation Request message.

Next, the SGW 60 establishes a bearer used for data transmission related to the UE 40 with the target PGW 80 according to the information related to the target PGW 80 set in the PGWPGRelocation Request message. Here, the interface between the SGW 60 and the target PGW 80 is defined as an S5 interface in 3GPP. The SGW 60 transmits a Create Session Request message to the target PGW 80 in order to establish an S5 session via the S5 interface with the target PGW 80 (S22).

Next, the target PGW 80 transmits a Credit Control Request message to the PCRF 100 in order to notify that the PGW that executes data transfer related to the UE 40 has been changed from the source PGW 70 to the target PGW 80 (S23). Next, the PCRF 100 transmits a Credit Control Answer message to the target PGW 80 as a response to the Credit Control Request message (S24).

Next, the target PGW 80 transmits a Create Session Response message to the SGW 60 as a response to the Create Session Request message (S25). The target PGW 80 transmits a Create Session Response message to the SGW 60, thereby establishing a bearer between the SGW 60 and the target PGW 80. Next, the SGW 60 transmits a PGW Relocation Response message to the source PGW 70 as a response to the PGW Relocation Request message (S26).

Subsequently, a flow of bearer establishment processing between the source PGW 70 and the target PGW 80 according to the second embodiment of the present invention will be described with reference to FIG. A session or bearer established between the source PGW 70 and the target PGW 80 may be referred to as Indirect tunnel.

The Indirect tunnel is used to perform data transfer between the source PGW 70 and the target PGW 80 in the process of switching the data transfer process related to the UE 40 from the source PGW 70 to the target PGW 80.

First, the source PGW 70 transmits a Create Indirect Data Tunnel Request message to the target PGW 80 (S31). The source PGW 70 sets identification information regarding the UE 40 that performs data transfer using Indirect tunnel in a Create Indirect Data Tunnel Request message.

Next, the target PGW 80 transmits a Create Indirect Data Tunnel Response message to the source PGW 70 as a response to the Create Indirect Data Tunnel Request message (S32). The target PGW 80 transmits a Create Indirect Data Tunnel Response message to the source PGW 70, whereby an Indirect tunnel is established between the source PGW 70 and the target PGW 80.

Subsequently, the flow of uplink data path switching processing according to the second embodiment of the present invention will be described with reference to FIG. The path switching process is a process of switching the data transfer path. The uplink data is data transmitted from the UE 40 to a server device on the Internet. The downlink data is data transmitted to the UE 40 from a server device on the Internet.

First, the source PGW 70 transmits a Path-Switch-Request message to instruct the SGW 60 to transmit uplink data related to the UE 40 to the target PGW 80 (S41). Next, the SGW 60 transmits a Path Switch Response message to the source PGW 70 as a response to the Path Switch Request message (S42). After step S42, the SGW 60 transmits uplink data related to the UE 40 to the target PGW 80. Further, the target PGW 80 transmits the uplink data transmitted from the SGW 60 to the source PGW 70 using Indirect / tunnel. This is because, at this stage, the SCS 90 has not been notified to process data related to the UE 40 in the target PGW 80.

Here, the transfer path of the uplink data and the downlink data will be described with reference to FIG. For downlink data transmitted from the server device or the like of the Internet 120 to the UE 40, the path switching process is not executed. Therefore, the downlink data is transmitted to the UE 40 via the SCS 90, the source PGW 70, the SGW 60, and the eNB 50.

For uplink data transmitted from the UE 40 to a server device or the like on the Internet 120, a path switching process is executed from the source PGW 70 to the target PGW 80. Therefore, the uplink data is transmitted to the Internet 120 via the eNB 50, the SGW 60, the target PGW 80, the source PGW 70, and the SCS 90.

As is clear from FIG. 9, when the uplink data path switching process of FIG. 8 is performed, the uplink data is transmitted on a different path from the downlink data.

Subsequently, a flow of downlink data path switching processing according to the second exemplary embodiment of the present invention will be described with reference to FIG. First, the source PGW 70 transmits a Path-Switch-Request message to instruct the target PGW 80 to transmit downlink data related to the UE 40 to the SGW 60 (S51). Next, the target PGW 80 transmits to the SCS 90 a transmission destination change notification message instructing to change the transmission destination of the downlink data destined for the UE 40 from the source PGW 70 to the target PGW 80 (S52). Next, the SCS 90 transmits a transmission destination change notification response message to the target PGW 80 as a response to the transmission destination change notification message (S53).

The SCS 90 switches the transmission destination of the downlink data destined for the UE 40 from the source PGW 70 to the target PGW 80 by transmitting a transmission destination change notification response message to the target PGW 80. Further, the SCS 90 recognizes that subsequent uplink data is also transmitted from the target PGW 80 by receiving the transmission destination change notification message.

Next, the target PGW 80 transmits a Path Switch Response message to the source PGW 70 as a response to the Path Switch Request message (S54). Here, the target PGW 80 transmits a Path Switch Response message to the source PGW 70, and in subsequent processing, the downlink data related to the UE 40 transmitted from the SCS 90 is transmitted to the SGW 60 without using the Indirect tunnel with the source PGW 70. Send. Further, the target PGW 80 switches the uplink data related to the UE 40 to be transmitted to the SCS 90 without using the Indirect tunnel with the source PGW 70.

Here, the transfer path of the uplink data and the downlink data will be described with reference to FIG. A path switching process is performed on downlink data transmitted from the server device or the like of the Internet 120 to the UE 40. Therefore, the downlink data is transmitted to the UE 40 via the SCS 90, the target PGW 80, the SGW 60, and the eNB 50.

Also, the upstream PGW 80 transmits the uplink data to the SCS 90 without using Indirect tunnel. Therefore, uplink data is transmitted to the Internet 120 via the eNB 50, the SGW 60, the target PGW 80, and the SCS 90.

As is clear from FIG. 11, when the downlink data path switching process of FIG. 10 is performed, the uplink data and downlink data are transmitted on the same route.

Subsequently, a flow of unnecessary bearer deletion processing according to the second exemplary embodiment of the present invention will be described with reference to FIG. First, the source PGW 70 transmits a Delete Bearer Request message to the SGW 60 in order to delete a bearer with the SGW 60 (S61). Next, the SGW 60 transmits a Delete Bearer Response message to the source PGW 70 as a response to the Delete Bearer Request message (S62). When the SGW 60 transmits a Delete Bearer Response message to the source PGW 70, the bearer between the SGW 60 and the source PGW 70 is deleted.

Next, the source PGW 70 transmits a Credit Control Request message to the PCRF 100 in order to transmit to the PCRF 100 that the bearer related to the UE 40 has been deleted with the SGW 60 (S63). Next, the PCRF 100 transmits a Credit Control Answer message to the source PGW 70 as a response to the Credit Control Request message (S64).

Next, in order to delete the Indirect tunnel with the target PGW 80, the source PGW 70 transmits a Delete Indirect Data ForwardingInTunnel Request message to the target PGW 80 (S65). Next, the target PGW 80 transmits a Delete Indirect Data Forwarding Tunnel Response message to the source PGW 70 as a response to the Delete Indirect Data Forwarding Tunnel Request message (S66). The target PGW 80 transmits a Delete Indirect Data Forwarding Tunnel Response message to the source PGW 70, whereby the Indirect tunnel between the source PGW 70 and the target PGW 80 is deleted.

As described above, the communication system according to the second embodiment of the present invention can shift the uplink data and downlink data related to the UE 40, which have been processed in the source PGW 70, to the target PGW 80 in a stepwise manner. For example, when each device involved in a path change changes the path of uplink data and downlink data at the same time, the processing load may increase rapidly and the convergence of the path change may be delayed. For this reason, it is possible to speed up the convergence of the route change by shifting the uplink data and the downlink data to the target PGW 80 at different timings.

Also, the communication system according to the second exemplary embodiment of the present invention can change the PGW used for data transmission without performing the Detach process in the UE 40 as in the first exemplary embodiment. Therefore, the PGW that performs data processing can also be changed for a UE in communication with a short switching time. Also, by not performing the Detach process, the UE can change the PGW that performs data processing without interrupting communication.

In the second embodiment, the communication system can change the PGW for each bearer. Therefore, the communication system can change only the PGW of a specific bearer without changing the PGW for all bearers when the Multi PDN is performed. For example, when the UE is executing a plurality of applications, the communication system can change the PGW only for communication related to some applications.

Further, in the second embodiment, an example in which LTE is mainly used as a wireless communication method has been described. However, the same effect as that of the second embodiment is also obtained in the case of using a wireless communication method referred to as 3G or a wireless LAN. Obtainable.

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 PGW and the SGW 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. 2015-053603 filed on March 17, 2015, the entire disclosure of which is incorporated herein.

10 Source PGW
11 Detection unit 12 Determination unit 13 Communication unit 20 Target PGW
30 SGW
40 UE
50 eNB
60 SGW
61 Communication unit 62 Control unit 70 Source PGW
71 Switching instruction unit 80 Target PGW
90 SCS
100 PCRF
110 Traffic collector 120 Internet

Claims

Detecting means for detecting a change in the communication state relating to the communication terminal in communication;
In the detection unit, when a change in the communication state is detected, a determination unit that determines a target PGW for executing communication of the communication terminal on behalf of the own device;
PGW comprising: communication means for transmitting to the SGW a message instructing to establish a first bearer related to the communication terminal with the target PGW.
The determining means includes
The PGW according to claim 1, wherein a second bearer for the communication terminal is established with the target PGW.
The PGW according to claim 2, further comprising a switching instruction unit that instructs the SGW to transmit data related to the communication terminal to be transmitted to the own device to the target PGW via the first bearer. .
The switching instruction means includes
The PGW according to claim 3, wherein the PGW is instructed to transmit to the target PGW data related to the communication terminal to be transmitted to the own node device to an opposite node device that communicates with an external network.
The switching instruction means includes
The PGW according to claim 4, wherein when the SGW and the opposite node device are instructed to change a transmission destination of data related to the communication terminal to be transmitted to the own device, the PGW according to claim 4 deletes the second bearer.
The detection means includes
The change in the communication state is detected using a DPI function, or the change in the communication state is detected using a control signal transmitted from another device. PGW.
Since the communication state relating to the communication terminal being communicated has changed, the communication relating to the communication terminal currently communicating via the source PGW is changed from the source PGW that has determined the target PGW to be executed on behalf of the source PGW to the second Communication means for receiving a message instructing to establish one bearer with the target PGW;
SGW comprising bearer control means for establishing the first bearer with the target PGW when receiving the message.
The communication means includes
When receiving a message instructing transmission of data related to the communication terminal to be transmitted to the source PGW to the target PGW via the first bearer, a transmission destination of data related to the communication terminal is sent from the source PGW. The SGW according to claim 7, wherein the SGW is switched to the target PGW.
Detects a change in the communication status related to the communication terminal during communication
If a change in the communication state is detected, determine a target PGW to execute communication of the communication terminal on behalf of its own device,
The bearer control method which transmits the message which instruct | indicates to establish the 1st bearer regarding the said communication terminal between the said target PGW to SGW.
Since the communication state relating to the communication terminal being communicated has changed, the communication relating to the communication terminal currently communicating via the source PGW is changed from the source PGW that has determined the target PGW to be executed on behalf of the source PGW to the second Receiving a message instructing to establish one bearer with the target PGW;
A bearer establishment method for establishing the first bearer with the target PGW when receiving the message.
Detects a change in the communication status related to the communication terminal during communication
If a change in the communication state is detected, determine a target PGW to execute communication of the communication terminal on behalf of its own device,
A non-transitory computer-readable medium storing a program for causing a computer to transmit a message instructing to establish a first bearer related to the communication terminal with the target PGW to the SGW.
Since the communication state relating to the communication terminal being communicated has changed, the communication relating to the communication terminal currently communicating via the source PGW is changed from the source PGW that has determined the target PGW to be executed on behalf of the source PGW to the second Receiving a message instructing to establish one bearer with the target PGW;
A non-transitory computer-readable medium storing a program that, when receiving the message, causes a computer to establish the first bearer with the target PGW.