JPWO2014049668A1 - Communication system, GGSN, PGW, and program - Google Patents

Abstract

When the distance between the international roaming destination SGSN or SGW and the international roaming source GGSN or PGW is long, a transmission delay occurs due to an increase in the data transfer distance. If the destination of the packet received from the first GGSN or first PGW functioning as a gateway of the private network and the SGSN or SGW is in the public network, the packet is transmitted to the destination in the public network, and the destination of the packet is Provided is a communication system comprising a second GGSN or a second PGW that transmits packets to the first GGSN or the first PGW when in a private network.

Description

  The present invention relates to a communication system, GGSN, PGW, and program.

The data transmitted from the terminal device located in the international roaming destination to the international roaming destination SGSN (Serving GPRS Support Node) or SGW (Serving Gateway) is transmitted to the international roaming source GGSN (Gateway GPRS Support Node) or PGW (Packet data). It is known to enable international roaming communication by transferring to the Internet via Gateway. (For example, 3GPP TS 23.060, TS 23.401, Patent Document 1).
Japanese Patent Application Laid-Open No. 2012-109709

  However, when the distance between the international roaming destination SGSN or SGW and the international roaming source GGSN or PGW is long, a transmission delay occurs due to a long data transfer distance.

  According to the first aspect of the present invention, when the destination of a packet received from the first GGSN or the first PGW functioning as a gateway of the private network and the SGSN or SGW is in the public network, the packet is transmitted to the public network. A communication system is provided comprising a second GGSN or a second PGW that transmits packets to a first GGSN or a first PGW when the packet destination is in a private network. .

  In the communication system, the second GGSN or the second PGW includes a reception unit that receives an encapsulated packet from the SGSN or SGW, a decapsulation unit that decapsulates the packet received by the reception unit, and a packet destination A destination determination unit that determines whether the packet is in the public network or the private network, and if the packet destination is in the private network, the decapsulation unit encapsulates the decapsulated packet, and the capsule The transmission unit may transmit the packet encapsulated by the conversion unit to the first GGSN or the first PGW. Moreover, in the said communication system, SGSN or SGW may encapsulate the packet received from the communication terminal, and may transmit to 2nd GGSN or 2nd PGW.

  In the communication system described above, the SGSN or SGW is configured to send a packet received from the communication terminal to the DNS that stores the APN (Access Point Name) and the IP address of the second GGSN or the second PGW in association with each other. The included APN may be transmitted, and the IP address of the second GGSN or the second PGW corresponding to the transmitted APN may be received from the DNS. In the communication system, the second GGSN or the second PGW includes a routing instance storage unit that stores a routing instance for performing a transfer path for each APN, and an APN included in a packet received from the SGSN or the SGW. And a transfer route determination unit that determines a transfer route of the packet based on the routing instance corresponding to.

  In the communication system, the transfer route determination unit may determine a transfer route for transferring a packet received from a communication terminal to the first GGSN or the first PGW. In the communication system, the transfer path determination unit may generate an instance corresponding to the determined packet transfer path. In the above communication system, the transfer path determination unit may generate the instance for each different APN when receiving a plurality of packets including different APNs from the same communication terminal. In addition, the communication system may further include a CDR storage unit that stores a CDR (Call Detail Record / Charge Data Record) for each instance generated by the transfer path determination unit. The first GGSN or the first PGW and the private network may be arranged in the first region, and the second GGSN or the second PGW and the SGSN or SGW may be arranged in the second region.

  According to the second aspect of the present invention, when the destination of the packet received from the SGSN is within the public network, the packet is transmitted to the destination within the public network, and when the destination of the packet is within the private network, A GGSN is provided that transmits packets to a GGSN that functions as a gateway.

  According to the third aspect of the present invention, when the destination of the packet received from the SGW is within the public network, the packet is transmitted to the destination within the public network, and when the destination of the packet is within the private network, A PGW is provided that transmits packets to the PGW functioning as a gateway.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

1 schematically shows a communication environment of a communication system 10. The function structure of 2nd GGSN200 is shown roughly. An example of the flowchart of the packet process with respect to the communication terminal 250 by 2nd GGSN200 is shown. An example of the correspondence table of APN memorize | stored by DNS242 and the IP address of GGSN is shown. 1 schematically shows a packet transfer path for each communication terminal. An example of a correspondence table between APNs stored in the routing instance storage unit 208 and routing instances is shown. An example of the hardware constitutions of 2nd GGSN200 is shown.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 schematically shows a communication environment of a communication system 10 when the present invention is applied to a third generation communication system (3G) system. The communication system 10 includes a first GGSN 100 and a second GGSN 200. The first GGSN 100 and the second GGSN 200 are connected via the backbone network 300. The backbone network 300 is, for example, GRX (GPRS Roaming Exchange).

  The first GGSN 100 is a GGSN arranged in the first region 11. The first region 11 is, for example, a country. The first GGSN 100 is managed by the first communication carrier. The first GGSN 100 functions as a gateway for the private network 110. Here, the gateway is a router located at the boundary of the independent system, and is provided between the dedicated network 110 and another network such as the backbone network 300.

  The private network 110 is a private network managed by the first communication carrier. The private network 110 may be accessible only by devices authorized by the first carrier. The private network 110 may be accessible only via the first GGSN 100. The dedicated network 110 is arranged in the first area 11. Note that the dedicated network 110 may be arranged in an area different from the first area 11.

  The second GGSN 200 is a GGSN arranged in a second region 12 different from the first region 11. For example, the second region 12 is a country different from the first region 11. The second GGSN 200 may be managed by the first communication carrier. The second GGSN 200 communicates with the SGSN 240 located in the second region 12.

  The SGSN 240 communicates with the DNS 242 and the communication terminal 250. The DNS 242 stores a plurality of APNs and a plurality of GGSN IP addresses in association with each other. The DNS 242 transmits the IP address of the GGSN corresponding to the APN received from the SGSN 240 to the SGSN 240.

  In the present embodiment, the DNS 242 stores the APN provided by the first communication carrier and the IP address of the second GGSN 200 in association with each other. The DNS 242 may store the APN provided by the first communication carrier and the IP address of the second GGSN in association with each other according to a request from the first communication carrier.

  In this embodiment, the DNS 242 may resolve the IP address of the DNS 122 arranged in the first region 11 by communicating with the Root DNS of the backbone network 300.

  The communication terminal 250 is a communication terminal used by a user who has signed a communication service contract with a first communication carrier, and is a mobile phone, for example. The communication terminal 250 has a so-called roaming function that enables communication via equipment provided by a communication carrier other than the first communication carrier. Here, an example of a processing procedure in which the second GGSN 200 transfers a packet transmitted from the communication terminal 250 toward the dedicated network 110 or the public network 400 will be briefly described. The public network 400 is a packet communication network, for example, the Internet.

  The communication terminal 250 transmits a communication connection request including an APN corresponding to the first GGSN 100 provided by the first communication carrier to the SGSN 240. The communication connection request transmitted by the communication terminal 250 is transmitted to the SGSN 240 via the radio base station and RNC (Radio Network Controller).

  The SGSN 240 transmits the APN included in the communication connection request received from the communication terminal 250 to the DNS 242. Then, the IP address of the second GGSN 200 corresponding to the transmitted APN is received from the DNS 242. The SGSN 240 transmits the communication connection request received from the communication terminal 250 with the IP address of the second GGSN 200 received from the DNS 242 as a destination.

  The second GGSN 200 determines a packet transfer path based on the APN included in the received communication connection request. The second GGSN 200 determines a transfer path for transferring the packet received from the communication terminal 250 to the first GGSN 100 when the destination of the packet is in the private network 110. In addition, when the destination of the packet is in public network 400, second GGSN 200 determines a transfer path for transferring the packet received from communication terminal 250 to the destination in public network 400.

  For example, a GTP (GRPS Tunneling Protocol) connection is set between the second GGSN 200 and the SGSN 240. A connection such as MiP (Mobile IP) may be set between the second GGSN 200 and the SGSN 240 as defined in the 3GPP specification. For example, the IP address is assigned to the communication terminal 250 by the second GGSN 200. The communication terminal 250 may be assigned an IP address by the first GGSN 100. Then, the IP address assigned by the second GGSN 200 or the first GGSN 100 is transmitted to the communication terminal 250 by the SGSN 240.

  Next, the communication terminal 250 transmits a packet to the IP address of the second GGSN 200 for data communication. The packet transmitted by the communication terminal 250 is transmitted to the second GGSN 200 via the SGSN 240. When the destination of the packet received from SGSN 240 is in public network 400, second GGSN 200 transmits the packet to the destination in public network 400. Further, the second GGSN 200 transmits the packet to the first GGSN 100 when the destination of the packet is in the private network 110.

  Thereby, when the destination of the packet is in the public network 400, the transmission delay of the packet can be reduced compared to the case where the packet is transmitted to the public network 400 via the first GGSN 100. Note that even when a packet is transmitted to the public network 400 via the visited GGSN provided in the second area 12 provided by another telecommunications carrier, as compared with that via the first GGSN 100. Transmission delay can be reduced.

  However, when passing through the visited GGSN, the communication terminal 250 cannot access the dedicated network 110. On the other hand, according to the second GGSN 200 according to the present embodiment, the packet transmitted by the communication terminal 250 can be transferred to the dedicated network 110 as well. That is, according to the second GGSN 200 according to the present embodiment, it is possible to reduce packet transmission delay while maintaining access to the dedicated network 110.

  FIG. 2 schematically shows a functional configuration of the second GGSN 200. The second GGSN 200 includes a reception unit 202, a communication control unit 204, a transfer route determination unit 206, a routing instance storage unit 208, a decapsulation unit 210, a destination determination unit 212, an encapsulation unit 214, a transmission unit 216, and a CDR storage unit. 218.

  The receiving unit 202 receives a packet from the SGSN 240. In addition, the reception unit 202 receives packets from the backbone network 300 and the public network 400. The communication control unit 204 controls the transfer path determination unit 206, the decapsulation unit 210, and the transmission unit 216 according to the packet received by the reception unit 202. When the packet received by the receiving unit 202 includes a connection request transmitted by the communication terminal 250, the communication control unit 204 causes the transfer route determining unit 206 to determine the packet transfer route.

  Further, when the packet received by the receiving unit 202 is a packet encapsulated by the SGSN 240, the communication control unit 204 causes the decapsulating unit 210 to decapsulate the encapsulated packet. The SGSN 240 encapsulates the packet according to GTP, for example.

  Further, when the packet received by the receiving unit 202 is a packet directed from the backbone network 300 or the public network 400 to the communication terminal 250, the communication control unit 204 controls the transmission unit 216 to transmit the packet to the SGSN 240. . The packet transmitted to SGSN 240 is transmitted to communication terminal 250 by SGSN 240.

  Further, when the packet received by the receiving unit 202 is a packet destined for the destination in the dedicated network 110 from the communication terminal 250, the communication control unit 204 controls the transmitting unit 216 to send the packet to the backbone network 300. Via the first GGSN 100. Further, when the packet received by the receiving unit 202 is a packet destined for the destination in the public network 400 from the communication terminal 250, the communication control unit 204 controls the transmission unit 216 to send the packet in the public network 400. Send to the destination.

  The transfer route determination unit 206 determines the transfer route of the packet received by the reception unit 202. The routing instance storage unit 208 stores a routing instance for determining a transfer route for each APN. The routing instance storage unit 208 stores routing instances for determining different transfer routes for a plurality of types of APNs.

  The plurality of types of APNs may be APNs provided by a plurality of carriers. The plurality of types of APNs may be APNs for a plurality of types of communication terminals for each of a plurality of communication carriers. The plurality of types of APNs may be APNs for a plurality of types of dedicated networks for each of a plurality of communication carriers. For example, a plurality of types of APNs include an APN for iPhone for a first private network provided by a first carrier, an APN for an Android terminal for a second private network provided by a first carrier, and An APN for an Android terminal for the third private network provided by the second communication carrier may be included.

  The transfer route determination unit 206 determines a packet transfer route based on the routing instance corresponding to the APN included in the connection request transmitted by the communication terminal 250 and stored in the routing instance storage unit 208. Then, the transfer path determination unit 206 generates an instance corresponding to the determined transfer path in response to the connection request of the communication terminal 250 in order to execute communication on the determined transfer path. When the communication terminal 250 executes packet communication, packet communication is executed according to the generated instance.

  The decapsulation unit 210 decapsulates the packet received by the reception unit 202. When the packet is encapsulated according to GTP, the decapsulation unit 210 performs so-called GTP termination. Then, the destination determination unit 212 determines whether the destination of the packet decapsulated by the decapsulation unit 210 is in the public network 400 or the dedicated network 110.

  When the destination of the packet is in the public network 400, the destination determination unit 212 causes the transmission unit 216 to transmit the decapsulated packet to the destination in the public network 400. In addition, when the destination of the packet is in the private network 110, the destination determination unit 212 causes the encapsulation unit 214 to encapsulate the decapsulated packet.

  The encapsulating unit 214 encapsulates the packet decapsulated by the decapsulating unit 210. When the packet received in step S304 is encapsulated according to GTP, the encapsulation unit 214 encapsulates the packet according to GTP. The encapsulation unit 214 may encapsulate the packet with the transmission source as the IP address of the second GGSN 200 and the transmission destination as the IP address of the first GGSN 100.

  The transmission unit 216 transmits the packet received by the reception unit 202 to the SGSN 240 under the control of the communication control unit 204. Further, the transmission unit 216 transmits the decapsulated packet received from the destination determination unit 212 to the destination in the public network 400. The transmission unit 216 transmits the packet encapsulated by the encapsulation unit to the destination dedicated network 110.

  The CDR storage unit 218 stores a CDR (Call Detail Record / Charge Data Record). The CDR storage unit 218 may generate and store a CDR for each instance generated by the transfer path determination unit 206. Thereby, for example, when the communication terminal 250 executes communication with different dedicated networks, the charging process can be executed for each communication with each dedicated network. Further, for example, a different charging process can be executed for each type of communication terminal 250.

  FIG. 3 shows an example of a flowchart of packet processing for the communication terminal 250 by the second GGSN 200. This flowchart starts when the second GGSN 200 receives a connection request transmitted by the communication terminal 250 that has completed location registration in the second region 12.

  In step S <b> 302, the transfer path determination unit 206 determines a packet transfer path based on the routing instance corresponding to the APN included in the connection request received from the communication terminal 250. The transfer path determination unit 206 generates an instance for the communication terminal 250 that has transmitted the connection request.

  In step S304, the receiving unit 202 receives a packet from the SGSN 240, the backbone network 300, or the public network 400. In step S306, the communication control unit 204 determines whether the packet received in step S304 is a packet received from the backbone network 300 or the public network 400 or a packet received from the SGSN 240. If the communication control unit 204 determines that the packet is not from the backbone network 300 or the public network 400, the process proceeds to step S308. If the packet is determined to be a packet from the backbone network 300 or the public network 400, the process proceeds to step S318. .

  In step S308, the decapsulation unit 210 decapsulates the packet received in step S304. In step S <b> 310, the destination determination unit 212 determines whether the destination of the decapsulated packet is in the public network 400 or the dedicated network 110. If the destination determining unit 212 determines that the destination is in the private network 110, the process proceeds to step S312. If the destination is determined to be in the public network 400, the process proceeds to step S316.

  In step S312, the encapsulating unit 214 encapsulates the packet decapsulated in step S308. In step S314, the transmission unit 216 transmits the packet encapsulated in step S312 to the first GGSN 100.

  If it is determined in step S310 that the destination of the packet is not in the private network 110 but in the public network 400, the process proceeds to step S316. In step S316, the transmission unit 216 transmits the packet decapsulated in step S308 to the destination in the public network 400.

  If it is determined in step S306 that the packet is from the backbone network 300 or the public network 400, the process proceeds to step S318. In step S318, the transmission unit 216 transmits the packet received in step S304 to the SGSN 240 in order to transmit to the communication terminal 250.

  After the transmission unit 216 transmits the packet to the SGSN 240 in step S318, the process proceeds to step S320. Further, after the transmission unit 216 transmits the packet to the first GGSN 100 in step S314 and after the transmission unit 216 transmits the packet to the destination in the public network 400 in step S316, the process proceeds to step S320.

  In step S320, the CDR storage unit 218 updates the CDR according to the packet transmitted by the transmission unit 216. The CDR storage unit 218 updates the CDR corresponding to the instance generated in step S302. The CDR storage unit 218 generates a CDR corresponding to the instance when there is no CDR corresponding to the instance.

  In step S322, the communication control unit 204 determines whether a disconnection request has been received from the communication terminal 250 via the SGSN 240. If the communication control unit 204 determines that a disconnection request has not been received, the process returns to step S304. If the communication control unit 204 determines that a disconnection request has been received, the communication disconnection process is executed and the process ends.

  FIG. 4 shows an example of a correspondence table between the APN stored by the DNS 242 and the IP address of the GGSN. The DNS 242 may store the APN and the IP address of the GGSN in the correspondence table in response to a request from the communication carrier that provides the APN. For example, the DNS 242 may request the two APNs for the two APNs according to a request from a first carrier that provides “aaa.xxx.ne.jp” and “bbb.xxx.ne.jp”. The IP address of the second GGSN 200 is stored.

  The second GGSN 200 may be shared by a plurality of communication carriers. For example, the second GGSN 200 is shared by a first telecommunications carrier and a second telecommunications carrier that is different from the first telecommunications carrier. In the example shown in FIG. 4, the IP address of the second GGSN is associated with “ccc.ΔΔΔ.ne.jp” provided by the second communication carrier.

  Thereby, the cost burden of each communication carrier which installs 2nd GGSN200 can be reduced. In addition, a user who has concluded a communication service contract with the first telecommunications carrier or the second telecommunications carrier designates the second GGSN 200 by designating an APN corresponding to the second GGSN 200 shown in FIG. Can receive packet forwarding service.

  In the example illustrated in FIG. 4, the GGSN of the third communication carrier provided by the third communication carrier is included in “ddd. □□□ .ne.jp” provided by the third communication carrier. It is associated. When DNS 242 receives “ddd. □□□ .ne.jp” from SGSN 240, DNS 242 transmits the GGSN IP address of the third communication carrier to SGSN 240.

  Then, the SGSN 240 forms a communication path with the GGSN of the third communication operator. As described above, communication via the GGSN corresponding to the APN can be provided to the APN that cannot receive the communication service provided by the second GGSN 200, as in the past.

  FIG. 5 schematically shows a packet transfer path for each communication terminal. The communication terminal 252 is a communication terminal that has concluded a communication service contract with a company A, which is a communication carrier. The communication terminal 254 is a communication terminal that has concluded a communication service contract with Company B, which is a communication carrier.

  When the second GGSN 200 receives a connection request including an APN corresponding to the first GGSN 102 of the company A from the communication terminal 252, the second GGSN 200, the backbone network 300, the first VLAN (Virtual LAN) 304 of the company A, The transfer route in the order of the first GGSN 102 of company A may be determined. In response to the connection request from the communication terminal 252, an instance corresponding to the determined transfer path is generated.

  After the instance generation, when the communication terminal 252 transmits a packet set in the first private network 112 whose destination is the company A to the second GGSN 200, the packet is stored in the backbone network 300 and the first VLAN 304 of the company A. , The first GGSN 102 of company A and the first private network 112 of company A are transferred in this order.

  In addition, when a packet whose destination is set to a shared ISP (Internet Service Provider) 404 is transmitted to the second GGSN 200 by the communication terminal 252, the packet is not transferred to the first GGSN 102 of the company A, and the backbone network It is transmitted to the shared ISP 404 via 300. The shared ISP is an ISP shared by a plurality of companies.

  In addition, when a packet whose destination is set to the ISP 406 for the company A is transmitted to the second GGSN 200 by the communication terminal 252, the packet is not transferred to the first GGSN 102 of the company A, but passes through the backbone network 300. And sent to the ISP 406 for Company A. The ISP for Company A is an ISP that can be used by a communication terminal that has concluded a communication service contract with Company A.

  As described above, the packet is transferred according to the transfer path determined by the second GGSN 200, thereby maintaining the access to the first dedicated network 112 of the company A from the communication terminal 252 or the ISP 406 for the company A or shared Packet transmission delay for the ISP 404 can be reduced.

  In addition, when the second GGSN 200 receives a connection request including an APN corresponding to the second GGSN 104 of the company A from the communication terminal 252, the second GGSN 200, the backbone network 300, the second VLAN 306 of the company A, the first of the company A The transfer path in the order of 2GGSN 104 is determined. In response to the connection request from the communication terminal 252, an instance corresponding to the determined transfer path is generated.

  After the instance is generated, when the communication terminal 252 transmits a packet set in the second dedicated network 114 whose destination is the company A to the second GGSN 200, the packet is stored in the backbone network 300 and the second VLAN 306 of the company A. , The second GGSN 104 of the company A and the second dedicated network 114 of the company A.

  As described above, even when a plurality of connection requests are received from the communication terminal 252, the second GGSN 200 generates an instance for each connection request when different APNs are specified in the plurality of connection requests. To do. That is, when a plurality of packets including different APNs are received from the same communication terminal, the transfer path determination unit 206 generates an instance for each different APN. Thereby, a packet can be transferred to each of a plurality of dedicated networks, and communication can be managed separately for each APN.

  When the second GGSN 200 receives a connection request including the APN corresponding to the B company GGSN from the communication terminal 254, the second GGSN 200 transfers the second GGSN 200, the backbone network 300, the B company VLAN 308, and the B company GGSN 106 in this order. Determine the route. In response to the connection request from the communication terminal 254, an instance corresponding to the determined transfer path is generated.

  After the instance is generated, when a packet set in the private network 116 whose destination is the company B is transmitted to the second GGSN 200 by the communication terminal 254, the packet is stored in the backbone network 300, the company B VLAN 308, and the company B. GGSN 106 and private network 116 of company B are transferred in this order.

  Further, when a packet whose destination is set to a shared ISP (Internet Service Provider) 404 is transmitted to the second GGSN 200 by the communication terminal 254, the packet is not transferred to the GGSN 106 of the B company, and the backbone network 300. To the shared ISP 404.

  FIG. 6 shows an example of a correspondence table between APNs stored in the routing instance storage unit 208 and routing instances. In the example illustrated in FIG. 6, a routing instance indicating a path “second GGSN → backbone network → first VLAN of company A → first GGSN of company A” is associated with “aaa.xxx.ne.jp”. It is associated.

  When the APN included in the connection request received from the communication terminal 252 is “aaa.xxx.ne.jp”, the transfer path determination unit 206 uses the second GGSN 200, the backbone network 300, and the first VLAN 304 of company A. , A transfer path in the order of the first GGSN 102 of company A is determined. In response to the connection request of the communication terminal 250, an instance corresponding to the transfer path is generated.

  FIG. 7 shows an exemplary hardware configuration of the second GGSN 200. The second GGSN 200 includes a CPU peripheral unit having a CPU 504 and a RAM 506 connected to each other by a host controller 502, and an input / output unit having a ROM 510 and a communication interface 512 connected to the host controller 502 by an input / output controller 508. . The input / output unit may further include a hard disk drive, a CD-ROM drive, and a USB interface.

  The host controller 502 connects the RAM 506 and a CPU 504 that accesses the RAM 506 at a high transfer rate. The CPU 504 operates based on programs stored in the ROM 510 and the RAM 506 to control each unit. The input / output controller 508 connects the host controller 502, the communication interface 512, which is a relatively high-speed input / output device, and the ROM 510.

  The communication interface 512 communicates with the SGSN 240 and an external packet network via the network. The hard disk drive stores programs and data used by the CPU 504 in the second GGSN 200. The CD-ROM drive reads a program or data from the CD-ROM and provides it to the hard disk drive via the RAM 506. The ROM 510 stores a boot program that the second GGSN 200 executes at startup, a program that depends on the hardware of the second GGSN 200, and the like.

  A program provided to the hard disk drive via the RAM 506 is stored in a recording medium such as a CD-ROM or a USB memory and provided by the user. The program is read from the recording medium, installed in the hard disk drive in the second GGSN 200 via the RAM 506, and executed by the CPU 504.

  The program installed and executed in the second GGSN 200 works on the CPU 504 and the like, and the second GGSN 200 is described with reference to FIGS. 1 to 6, the receiving unit 202, the communication control unit 204, the transfer path determination unit 206, The routing instance storage unit 208, the decapsulation unit 210, the destination determination unit 212, the encapsulation unit 214, the transmission unit 216, and the CDR storage unit 218 function.

  In this embodiment, although the communication terminal 250 located in the 2nd area 12 demonstrated and demonstrated the example which transmits a packet to SGSN240 arrange | positioned in the 2nd area 12, it does not restrict to this. A packet transmitted from a communication terminal 250 located in a third area other than the first area and the second area 12 to the SGSN arranged in the third area is transmitted from the SGSN arranged in the third area. , May be sent to SGSN 240. Thereby, for example, even when one second GGSN 200 is arranged for a plurality of countries, the second GGSN 200 can be used from a plurality of countries. One or more second GGSNs 200 may be arranged in each area.

  In this embodiment, when the destination of the packet received by the receiving unit 202 is in the private network 110, the second GGSN 200 transmits the packet encapsulated by the encapsulating unit 214 to the first GGSN 100. explained. In addition to this, when the destination of the packet received by the receiving unit 202 is in the private network 110, the second GGSN 200 transmits the packet decapsulated by the decapsulating unit 210 to the border gateway of the private network 110. Also good.

  In the present embodiment, the case where the present invention is applied to the third generation communication method has been mainly described as an example. However, it is not limited to this. The present invention may be applied to LTE (Long Term Evolution). When applied to LTE, the first GGSN 100 may be a first PGW installed in the first region 11. Further, the second GGSN 200 may be a second PGW installed in the second area 12. SGSN 240 may be MME (Mobility Management Entity) and SGW. Further, the packet transmitted by the communication terminal 250 may be transmitted to the SGW via the radio base station, not via the RNC. The SGSN may be connected to the SGW or PGW.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The execution order of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior”. It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. is not.

10 communication systems, 11 1st region, 12 2nd region, 100 1st GGSN, 102A company's 1 GGSN, 104A company's 2nd GGSN, 106B company's GGSN, 110 private network, 112A company's 1st dedicated network, 114A company 2nd dedicated network, 116B company dedicated network, 122 DNS, 200 2nd GGSN, 202 receiving unit, 204 communication control unit, 206 transfer path determining unit, 208 routing instance storage unit , 210 Decapsulation unit, 212 Destination determination unit, 214 Encapsulation unit, 216 Transmission unit, 218 CDR storage unit, 240 SGSN, 242 DNS, 250 communication terminal, 252 communication terminal, 254 communication terminal, 300 backbone network, 304 company A 1st VLAN, 306 Company A's 2nd VLAN, 308 Company B's LAN, 400 a public network, 404 shared ISP, 406 A company ISP, 502 host controller, 504 CPU, 506 RAM, 508 input-output controller, 510 ROM, 512 communication interface

Claims (14)

A first GGSN (Gateway GPRS Support Node) or a first PGW (Packet data network Gateway) that functions as a gateway for the private network;
When the destination of the packet received from the SGSN (Serving GPRS Support Node) or SGW (Serving Gateway) is in the public network, the packet is transmitted to the destination in the public network, and the destination of the packet is in the dedicated network. In some cases, a communication system comprising a second GGSN or a second PGW that transmits the packet to the first GGSN or the first PGW. The second GGSN or the second PGW is
A receiving unit for receiving the encapsulated packet from the SGSN or the SGW;
A decapsulation unit that decapsulates the packet received by the reception unit;
A destination determination unit that determines whether the destination of the packet is in a public network or the dedicated network;
When the destination of the packet is in the private network, an encapsulation unit that encapsulates the packet decapsulated by the decapsulation unit;
The communication system according to claim 1, further comprising: a transmission unit that transmits the packet encapsulated by the encapsulation unit to the first GGSN or the first PGW.   The communication system according to claim 2, wherein the SGSN or the SGW encapsulates a packet received from a communication terminal and transmits the packet to the second GGSN or the second PGW.   The SGSN or the SGW stores the APN included in the packet received from the communication terminal in the DNS that stores the APN (Access Point Name) and the second GGSN or the IP address of the second PGW in association with each other. The communication system according to any one of claims 1 to 3, wherein the second GGSN or the IP address of the second PGW corresponding to the transmitted APN is transmitted and received from the DNS. The second GGSN or the second PGW is
A routing instance storage unit that stores a routing instance for determining a transfer route for each APN;
5. The transfer path determination unit according to claim 1, further comprising: a transfer path determination unit that determines a transfer path of the packet based on a routing instance corresponding to the APN included in the packet received from the SGSN or the SGW. The communication system according to item.   The communication system according to claim 5, wherein the transfer path determination unit determines a transfer path for transferring a packet received from a communication terminal to the first GGSN or the first PGW.   The communication system according to claim 5 or 6, wherein the transfer path determination unit generates an instance corresponding to the determined transfer path of the packet.   The communication system according to claim 7, wherein the transfer path determination unit generates the instance for each different APN when receiving a plurality of packets including different APNs from the same communication terminal. The communication system according to claim 7, further comprising a CDR storage unit that stores a CDR (Call Detail Record / Charge Data Record) for each instance generated by the transfer path determination unit.   The first GGSN or the first PGW and the dedicated network are arranged in a first area, and the second GGSN or the second PGW and the SGSN or the SGW are arranged in a second area. The communication system according to any one of claims 1 to 9.   When the destination of the packet received from the SGSN is within the public network, the packet is transmitted to the destination within the public network, and when the destination of the packet is within the private network, the GGSN functioning as the gateway of the private network is sent to GGSN sending the packet.   The program for functioning a computer as GGSN of Claim 11.   When the destination of the packet received from the SGW is within the public network, the packet is transmitted to the destination within the public network, and when the destination of the packet is within the private network, the PGW functioning as the gateway of the private network A PGW that transmits the packet.   A program for causing a computer to function as the PGW according to claim 13.

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