JP4506883B2 - Mobile communication system, traffic transfer apparatus, traffic transfer method and program - Google Patents

Description

  The present invention relates to a mobile communication system, a traffic transfer apparatus, a traffic transfer method, and a program, and more particularly to a mobile communication system, a traffic transfer apparatus, and a traffic transfer that realizes IP mobility by detecting movement of a mobile terminal and managing movement on the network side. The present invention relates to a method and a program.

  In recent years, standardization of next-generation networks such as SAE (System Architecture Evolution) and All-IP NETWORK (AIPN) has been studied (see Non-Patent Documents 1 and 2).

  As the mobility control method in the network, there are a method in which a route change instruction is given on the terminal side represented by MIPv4 and MIPv6, and a method in which a route change function is provided on the network side represented by PMIPv4 and PMIPv6 (Proxy Mobile IPv6). Proposed. PMIPv6 is based on MIPv6 (Mobile IPv6; also referred to as “CMIP”), and is a method for detecting movement of a mobile terminal on the network side and performing movement management, and without adding protocol-specific functions to the mobile terminal. There is an advantage that mobility can be realized (see Non-Patent Document 3).

  In addition, Patent Documents 1 and 2 disclose a mobile communication system using the former MIPv6.

Re-specialized WO2005 / 006674 JP 2006-222591 A 3GPP TS 23.401 V8.1.0, March 2008 3GPP TS 23.402 V8.1.1, March 2008 S. Gundavelli et al. , "Proxy Mobile IPv6", http://tools.ietf.org/id/draft-ietf-netlmm-proxymip6-11.txt

  Problems of the mobile communication systems described in Non-Patent Documents 1 and 2 will be described with reference to FIGS. 5 to 8 by taking as an example the case of using IMS (IP-Multimedia Service).

FIG. 5 shows a case where a local breakout from the mobile access gateway (MAG) 100 on the visited network 600 side is selected. In this case, SIP (Session Init ia tion Protocol) signal (broken line in FIG. 5) also becomes to be a local breakout, the SIP server 501 in the home network 500 to MAG100 the foreign network 600, a mobile relay reliable property It goes through an unspecified network such as the Internet 700 instead of the network 701. For this reason, there is a high possibility that the reliability of the signal for controlling the voice call is impaired or the connection service time is affected by a transmission delay or the like.

  FIG. 6 shows a case where access via the MAG 100 on the home network 500 side is selected. In this case, although the SIP signal (broken line in FIG. 6) passes through the reliable mobile relay network 701, the voice data (the one-dot chain line in FIG. 6) always passes through the home network 500. For example, since a P2P communication via the home network 500 is always performed even in a voice call with the terminal 401 in the visited network, there is an adverse effect on service quality such as voice quality degradation due to meaningless transmission delay. Concerned.

  In order to overcome the above problem of inappropriate transfer of traffic, the radio access bearer 300 is dual-stacked as shown in FIG. 7, and the mobile IP client on the terminal 400 side only with the IP version of the SIP signal (solid line in FIG. 7). It is also conceivable that a client mobile IP tunnel 507 is established between the home agent (HA) 506 in the home network 500 and the terminal 400, and the SIP signal is always routed through the HA 506 in the home network 500. In this case, it is necessary to start the mobile IP client on the terminal 400 side, and it is necessary to provide the mobile overhead between the terminal and the network and the mobile IP client function on the terminal side. In addition, since routing from the HA 506 to the client mobile IP tunnel 507 is user traffic routing addressed to the IP address of the terminal 400, there is a problem that there is a high possibility that the routing will be via an unspecified relay network.

  As an approach different from that of FIG. 7, as shown in FIG. 8, a packet data network (PDN) is separated for signaling and voice packets, and a radio access bearer 300a and a radio access bearer 300b are established. A method of using different MAGs 100 and 504 is also conceivable. In this case, radio access bearers for different PDNs are always set, and mobility & bearer control is performed under different mobile anchors. Therefore, it is necessary to perform multiple mobility management and bearer control. There is a problem that it becomes complicated.

The present invention has been made in view of the above-described circumstances, and the object of the present invention is PMIPv6 when there is no bearer type in the radio access bearer 300 accommodated by the MAG 100, such as the S5 IETF model of the SAE architecture. To provide a mobile communication system, a traffic transfer device, a traffic transfer method, and a program capable of realizing traffic selective routing without impairing the advantages of a method of providing a route change function on the network side represented by (Proxy Mobile IPv6) is there.

According to a first aspect of the invention, means for analyzing a flow in a radio access bearer established with a user terminal to access a packet data network (PDN), on behalf of the user terminal, a proxy mobile IP client to perform mobility management of the user terminal, the result of the previous SL analysis, the traffic identified as being IPv6, determines that the signaling for IMS (IP-Multimedia Service) SIP (Session Initiation Protocol), the A means for forwarding traffic to a SIP server via a proxy mobile IP client and a mobile relay network, determining that traffic is identified as IPv4 as voice data, and performing local breakout forwarding to a packet data network (PDN). A traffic communication apparatus or a mobile communication system including the traffic transfer apparatus is provided.

According to a second aspect of the present invention, there is provided a traffic transfer method implemented in the above mobile communication system. According to this method, the traffic transfer apparatus analyzes the flow in the radio access bearer established with the user terminal. Then, the traffic transfer apparatus, based on flow analysis result of the radio access bearer, the traffic is identified as a I IPv6, determines that the signaling for IMS (IP-Multimedia Service) SIP (Session Initiation Protocol) The traffic is transferred to the SIP server via the proxy mobile IP client and the mobile relay network, and the traffic identified as IPv4 is determined as voice data, and control is performed to transfer the local breakout to the packet data network (PDN). .

According to the third aspect of the present invention, there is provided a program to be executed by a computer constituting the above-described traffic transfer apparatus. This program includes a flow analysis means of the radio access bearer, based on flow analysis result of the radio access bearer, the traffic is identified as a I Pv6, IMS (IP-Multimedia Service) SIP (Session Initiation Protocol) For traffic, and forwards to the SIP server via the proxy mobile IP client and the mobile relay network. The traffic identified as IPv4 is determined as voice data, and the local breakout occurs in the packet data network (PDN). Any computer can function as the transfer means.

ADVANTAGE OF THE INVENTION According to this invention, the routing according to traffic classification is realizable, without adding the function of a terminal or complicating radio | wireless access bearer control. The reason is that the traffic transfer device on the network side is provided with means for analyzing the flow in the radio access bearer and means for performing routing based on the analysis result.

  Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating a configuration of a mobile communication system according to the first embodiment of the present invention. Referring to FIG. 1, a home network 500 in which a SIP server 501 and a home agent / mobile anchor point (HA / MAP) 511 are arranged, a packet data network (PDN), and a MAG 100 are arranged to provide services to terminals 400 and 401. A visited network 600, the Internet 700, and a mobile relay network 701 are shown.

  The MAG 100 includes a PMIPv6 client as described later, and realizes IP mobility with the HA / MAP 511 of the home network 500 in place of the terminal 400 that does not have the PMIPv6 client. Further, the MAG 100 establishes a PMIPv6 internode tunnel 510 with high security between the home network 500 and the visited network 600 via the mobile relay network 701 in order to establish a mobility tunnel between network nodes. Furthermore, the MAG 100 according to the present embodiment further includes a bearer type determination unit, and operates as a traffic transfer device described later.

  It is assumed that the MAG 100 and the terminal 400 support IPv4 / v6 dual stack on the same radio access bearer 300.

  Further, the terminal 400 applies IPv6 to the always-connectable IMS SIP signal (broken line in FIG. 1) and dynamically establishes voice data (one point in FIG. 1) when a voice call is actually generated. It is assumed that IPv4 is applied to the chain line.

  In the following description, a secure PMIPv6 inter-node tunnel 510 is established between the PMIPv6 client 102 of the MAG 100 of the visited network 600 and the HA / MAP 511 of the home network 500 via the mobile relay network 701. It shall be.

  FIG. 2 is a block diagram showing a configuration example of the MAG 100 of the present embodiment. Referring to FIG. 2, a MAG 100 including a bearer type determination unit 101 and a PMIPv6 client 102 is illustrated.

  In the example of FIG. 2, a default bearer 310 and a dedicated bearer 311 are established in a radio access bearer accommodated by the MAG 100 in accordance with the S5 GTP model of the SAE architecture (see Non-Patent Document 1).

  The bearer type determination unit 101 identifies the bearer type in the radio access bearer 300, and performs an operation of changing the traffic forwarding destination based on each bearer type, the PDN 601 and the policy for each user. In the example of FIG. 2, the bearer type determination unit 101 determines that user traffic in the default bearer 310 is signaling for IMS SIP, and transfers it to the PMIPv6 client 102. The bearer type determination unit 101 determines that traffic in the Dedicated bearer 311 is voice data, and transfers the local breakout to the PDN 601. The bearer type (default bearer / Dedicated bearer) described above can be determined by a tunnel ID (TEID; Tunnel Endpoint ID) assigned to a tunnel header of GTP (GPRS Tunneling Protocol).

  The PMIPv6 client 102 is a PMIPv6 client that operates on behalf of the terminal 400 that does not have a PMIPv6 client. The PMIPv6 client 102 transfers the transferred user traffic in the default bearer 310 to the SIP server 501 via the PMIPv6 inter-node tunnel 510.

  Although the configuration of the present embodiment has been described above, the PMIPv6 client 102, the default bearer 310, and the Dedicated bearer 311 in FIG. 2 are given as specific examples of the present invention and are well known to those skilled in the art. Since it is not directly related to the present invention, its detailed description is omitted.

  Next, the operation of this embodiment will be described in detail with reference to FIG. Hereinafter, an example in which a voice call is made from the terminal 400 to the terminal 401 via the SIP server 501 will be described. First, when the terminal 400 attaches to the mobile access network 200, the terminal 400 establishes a default bearer 310 in the radio access bearer 300 for PDN601 access, and assigns it to the IPv6 SIP signal for IMS (broken line in FIG. 1).

  The bearer type determination unit 101 determines the bearer type. Here, since it is traffic in the default bearer 310, it is determined as signaling for IMS SIP, and the bearer type determination unit 101 connects the default bearer 310 and the PMIPv6 client 102.

  The PMIPv6 client 102 receives the establishment of the default bearer 310, and establishes the PMIPv6 inter-node tunnel 510 with the HA / MAP 511 arranged in the user's home network 500 without passing through the PDN 601.

  It is assumed that the above-described PMIPv6 inter-node tunnel 510 has a policy established to pass through the mobile relay network 701 by agreement between mobile operators. Therefore, the SIP signal can always be transmitted and received between the home network 500 and the terminal 400 via a secure network.

  Thereafter, when the terminal 400 establishes an IMS call with the SIP signal (broken line in FIG. 1) via the SIP server 501, the terminal 400 establishes a Dedicated bearer 311 for IPv4 voice data (dashed line in FIG. 1) communication. .

  The bearer type determination unit 101 transfers traffic in the Dedicated bearer 311 to the PDN 601 and realizes a local breakout of voice data.

  Further, the bearer type determination unit 101 transfers the received traffic to the default bearer 310 or the dedicated bearer 311. At that time, the bearer type determination unit 101 performs a rule check on a packet to be received via PMIPv6 (IPv6) and a packet to be received via PDN 601 (IPv4), and has a function of preventing reception of a packet in violation of the rule. Shall have.

  As described above, in the present embodiment, it is allowed to mix local breakout traffic and PMIPv6-compatible traffic, and optimum routing according to the traffic type is possible.

  Further, as described above, since only the radio access bearer 300 addressed to a single PDN is used, it is not necessary to make the radio access bearer control in the mobile access network 200 complicated.

  Further, in the present embodiment, the proxy mobile IP (PMIP) is applied to the traffic via the home network 500 such as the SIP signal without using the user packet routing logic of the client base mobile IP such as MIPv4 and MIPv6. The secure mobile relay network 701 can be used by routing with inter-node routing logic between the home node and the visited node.

  Furthermore, in the present embodiment, since the proxy mobile IP (PMIP) is used as described above, it is not necessary to install the mobile IP function in the terminal 400, the terminal function can be simplified, and the mobile access network 200 can be simplified. There is also an advantage that a signaling signal and data overhead between the terminal 400 and the MAG network can be reduced.

[Second Embodiment]
Next, a second embodiment of the present invention that assumes a case where there is no bearer type in the radio access bearer 300 accommodated by the MAG 100, such as the S5 IETF model of the SAE architecture, will be described.

  FIG. 3 is a diagram illustrating a configuration of a mobile communication system according to the second embodiment of the present invention. The difference from the configuration of the first embodiment described above is that there is no bearer type in the radio access bearer 300. Hereinafter, the detailed configuration of the MAG 100, which is different from the configuration of the first embodiment, will be described in detail with reference to FIG.

  FIG. 4 is a block diagram showing a configuration example of the MAG 100 of the present embodiment. Referring to FIG. 4, a MAG 100 including a flow analysis unit 110 and a PMIPv6 client 102 is shown.

The flow analysis unit 110 analyzes the user traffic in the radio access bearer 300, and changes the transfer destination of traffic based on the protocol type (IPv6 / v4) of the transfer packet obtained by the analysis, the PDN 601, and the policy for each user. Perform the action. In the example of FIG. 4, the flow analysis unit 110 determines that the IPv6 traffic is signaling for IMS SIP, and transfers it to the PMIPv6 client 102. Further , the flow analysis unit 110 determines that the IPv4 traffic is voice data, and transfers the local breakout to the PDN 601. Note that the protocol type (IPv6 / v4) of the transfer packet can be obtained by analyzing information such as the port number of the IP packet header or the UDP header.

  Other configurations and operations are the same as those in the first embodiment. As described above, by providing a function of determining a traffic transfer destination based on the IP version or the like instead of the bearer type, it is possible to perform optimum routing according to the traffic type.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and further modifications, replacements, and replacements may be made without departing from the basic technical idea of the present invention. Adjustments can be made. For example, the PMIPv6 client 102 is provided in the MAG 100. However, the PMIPv4 client 102 and a Forward Agent (FA) may be used.

  In the above-described embodiment, an example using PMIPv6 as a mobility protocol has been described. However, the present invention can also be applied to other mobility protocols.

  In addition, the present invention is based on the mobile core network SAE / EPC (System Architecture Evolution / Evolved PP) standardized for LTE (Long Term Evolution), which is currently being standardized by 3GPP (Third Generation Partnership Project). It can be used in the mobile core network IP-CAN (Internet Protocol-Connectivity Access Network) for UMB (Ultra Mobile Broadband) that is being promoted.

It is a figure showing the structure of the mobile communication system which concerns on the 1st Embodiment of this invention. It is a block diagram showing the structure of the mobile access gateway (MAG) of the 1st Embodiment of this invention. It is a figure showing the structure of the mobile communication system which concerns on the 2nd Embodiment of this invention. It is a block diagram showing the structure of the mobile access gateway (MAG) of the 2nd Embodiment of this invention. It is a figure for demonstrating the problem of the mobile communication system which does not have a traffic transfer function. It is a figure for demonstrating the problem of the mobile communication system which does not have a traffic transfer function. It is a figure for demonstrating the problem of the mobile communication system which does not have a traffic transfer function. It is a figure for demonstrating the problem of the mobile communication system which does not have a traffic transfer function.

Explanation of symbols

100 MAG
101 Bearer type determination unit 102 PMIPv6 client 110 Flow analysis unit 200 Mobile access network 300, 300a, 300b Radio access bearer 310 Default bearer 311 Dedicated bearer 400, 401 Terminal 500 Home network 501 SIP server 504 MAG
505, 601 PDN (packet data network)
506 HA (Home Agent)
507 Client mobile IP tunnel (CMIP tunnel)
510 PMIPv6 inter-node tunnel 511 HA / MAP (home agent / mobile anchor point)
600 Visited network 700 Internet 701 Mobile relay network

Claims (9)

Means for analyzing a flow in a radio access bearer established with a user terminal to access a packet data network;
In place of the user terminal, a proxy mobile IP client that manages the movement of the user terminal;
Results of the previous SL analysis, the traffic identified as being IPv6, determines that the signaling for IMS (IP-Multimedia Service) SIP (Session Initiation Protocol), the SIP server via the proxy mobile IP client and a mobile relay network transferred, the traffic identified as being IPv4, determines that the audio data, means for local breakout transferred to the packet data network (PDN),
A mobile communication system comprising:   The mobile communication system according to claim 1, wherein the proxy mobile IP client is set to establish a route through the mobile relay network based on a predetermined policy with a mobility anchor point of a home network.   The mobile communication system according to claim 1 or 2, wherein the mobile access gateway (MAG) operates as a traffic transfer device. Means for analyzing a flow in a radio access bearer established with a user terminal to access a packet data network;
In place of the user terminal, a proxy mobile IP client that manages the movement of the user terminal;
Results of the previous SL analysis, the traffic identified as being IPv6, determines that the signaling for IMS (IP-Multimedia Service) SIP (Session Initiation Protocol), the SIP server via the proxy mobile IP client and a mobile relay network Means for forwarding and identifying traffic identified as IPv4 as voice data and local breakout forwarding to a packet data network (PDN) ;
A traffic transfer apparatus having   5. The traffic transfer apparatus according to claim 4, wherein the proxy mobile IP client is set to establish a route through the mobile relay network based on a predetermined policy with a mobility anchor point of a home network.   6. The traffic transfer apparatus according to claim 4 or 5, which also operates as a mobile access gateway (MAG). The traffic transfer device connected to the packet data network analyzes the flow in the radio access bearer established with the user terminal,
Before SL traffic forwarding device, the result of the analysis, the traffic identified as being IPv6, determines that the signaling for IMS (IP-Multimedia Service) SIP (Session Initiation Protocol), the Proxy Mobile IP client and the mobile relay A traffic transfer method in which traffic transferred to a SIP server via a network and identified as IPv4 is determined as voice data, and local breakout transfer is performed to a packet data network (PDN) .   8. The traffic forwarding method according to claim 7, further comprising the step of establishing a path through which the proxy mobile IP client passes the mobile relay network based on a predetermined policy with a mobility anchor point of the home network. A process in which a traffic transfer apparatus connected to a packet data network analyzes a flow in a radio access bearer established with a user terminal;
Results of the previous SL analysis, the traffic identified as being IPv6, determines that the signaling for IMS (IP-Multimedia Service) SIP (Session Initiation Protocol), the SIP server via the proxy mobile IP client and a mobile relay network A process of forwarding and determining traffic identified as IPv4 as voice data and local breakout forwarding to a packet data network (PDN) ;
A program for causing a computer constituting the traffic transfer apparatus of the mobile communication system to execute.

Images