KR20080041989A - Method for ip address allocation of mobile station in mobile communication system - Google Patents

Abstract

A method for allocating a dynamic IP address to an MS(Mobile Station) in a mobile communication system is provided to link a control plane process and a user plane process in an IP-based next generation mobile communication system, thereby reducing the frequency of signal exchange processes for the allocation of an IPv6 address and reducing the entire process delay. A method for allocating a stateless IPv6(Internet Protocol Version6) address to an MS(Mobile Station)(300) comprises the following steps of: allowing the MS to generate an active PDP(Packet Data Protocol) context request message and transmit the active PDP context request message to an MME/UPE(Mobility Management Entity/User Plane Entity)(312); allowing the session management block of the MME/UPE to perform authentication and configuration processes for a stateless IPv6 address auto configuration process; allowing the session management block of the MME/UPE to transmit a router solicitation message included into the active PDP context request message to the IP(Internet Protocol) gateway block of the MME/UPE and allowing the IP gateway block to transmit a router advertisement message to the session management block; acquiring a global IPv6 address; allowing the session management block to transmit an active PDP context accept message to the MS; and allowing the MME/UPE to store the global IPv6 address in a PDP context.

Description

Dynamic IP address allocation method for mobile terminal in mobile communication system {METHOD FOR IP ADDRESS ALLOCATION OF MOBILE STATION IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a method for allocating a dynamic IP address for a mobile terminal in a mobile communication system. More particularly, the session management protocol procedure for allocating an Internet Protocol (IP) address to a mobile terminal in an IP-based mobile communication system. Dynamic IP address for the mobile terminal in the mobile communication system by dynamically allocating an IP address in conjunction with an IP address, thereby simplifying the address assignment process and thereby quickly assigning an IP address, thereby increasing the efficiency of radio resource utilization. It is about an allocation method.

The present invention is derived from the research conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2005-S-404-22, Project Name: 3G Evolution Access Technology] .

Currently, in 3GPP Release 6, standards for static IPv6 address allocation and dynamic IPv6 address allocation are described as methods for allocating IPv6 addresses of mobile terminals.

In this case, the static address allocation method is a method of allocating an IPv6 prefix by an operator when a mobile terminal is subscribed, and the dynamic address assignment method is a method of assigning a mobile terminal during a PDP activation procedure, which is a session management procedure. The method of allocating IPv6 address. For dynamic IPv6 address allocation in the above manner, 3GPP proposes 'stateless address auto-configuration method' and 'stateful address auto-configuration method'. Doing.

When using auto-configuration of IPv6 addresses, the signaling procedure performed by the Internet Service Provider (ISP) is divided into two steps. The first step is the signal procedure using the control plane of the mobile communication system, and the second step is the signal procedure using the user plane. In this case, the first step signaling procedure refers to a packet data protocol (PDP) context activation procedure using a session management protocol, and the second step signaling procedure is an internet control message protocol (ICMP). It means the signal process by internet protocol such as 'Protocol'.

As mentioned above, the signal procedure based on the Internet protocol can be divided into a stateless auto-configuration procedure and a stateful auto-configuration procedure.

Here, the 'stateless auto-configuration procedure' is a method of allocating an IPv6 address through interworking between a mobile terminal and a gateway (eg, GGSN in 3GPP) of a core network. When the prefix portion of the IPv6 address is transmitted to the mobile terminal, the mobile terminal sets the IPv6 address by combining the received prefix portion and the interface identifier (Interface-ID). In contrast, the Stateful Auto-configuration procedure uses IPv6 through interworking between the mobile terminal, the gateway of the core network, and the Dynamic Host Configuration Protocol (DHCP) server of the Internet Service Provider (ISP). This is an address allocation method.

Currently, 3GPP uses the stateless auto-configuration method described above as a mandatory method, and the stateful auto-configuration method is optional. In a way.

1 and 2 illustrate an IPv6 auto-configuration procedure proposed in the existing 3GPP standard, and includes a mobile terminal (MS) consisting of a terminal equipment (TE) / user equipment (UE). : Signaling procedure performed between Mobile Station, Serving GPRS Support Node (SGSN) / Gateway GPRS Support Node (GGSN), and Internet Service Provider (ISP). The following shows the procedure for configuring an IPv6 address. Hereinafter, each of FIGS. 1 and 2 will be described.

FIG. 1 is a flowchart illustrating a stateless IPv6 address allocation method in a conventional mobile communication system (3GPP).

In order to dynamically allocate an IPv6 address, the mobile terminal (MS) 10 accessing the mobile communication network sends a PDP context activation request message (“Activate PDP Context Request” message) to the SGSN 11 as a session management (SM) protocol procedure. In step 101, a process of transmitting is performed. Here, the "Activate PDP Context Request" message is used for activating the PDP context and establishing a service session between the mobile terminal and the core network. The message includes an access point name (APN), a quality of service (QoS), and a network service access (NSAPI). Point Identifier), IP address and interworking protocol, and Protocol Configuration Option (PCO) for service (see FIG. 6A).

In particular, when requesting dynamic IPv6 address allocation, the mobile terminal 10 sets the PDP address IE of the message to "0" and transmits it to the SGSN 11, and the SGSN 11 receiving the message receives the corresponding PDP. A context creation request message ("Create PDP Context Request" message) is generated and transmitted to the GGSN 12 (102).

The GGSN 12 receiving the "Create PDP Context Request" message recognizes the IPv6 address allocation method (Stateless, Stateful), and works with the authentication server (RADIUS server) provided by the ISP, and the GGSN 12's own prefix. A prefix and an interface ID are allocated using a pool (103). Here, the interface ID generated in the GGSN 12 must be different from the interface ID of the mobile terminal MS, and the prefix assigned to each mobile terminal MS is mobile. Differently allocated to each MS. In addition, the prefix assigned to the mobile terminal MS is generated by the GGSN 12 through interworking with an external authentication server (that is, an AAA (Authentication, Authorization, and Accounting) server).

The GGSN 12 that has performed the above procedure generates a PDP context creation response message (“Create PDP Context Response” message) including an IPv6 address composed of a prefix and an interface ID to the SGSN 11. Transmitting (104), the SGSN (11) receiving this message stores the corresponding IPv6 address and sends a PDP context activation accept message (" Activate PDP Context Accept " message) (see FIG. 6B) to the mobile terminal (MS) 10; To 105.

After receiving the "Activate PDP Context Accept" message, the mobile station (MS) 10 recognizes that the signaling procedure of the control plane is completed, and extracts the interface identifier (Interface-ID) from the received "Activate PDP Context Accept" message. In the user plane, an IPv6 address auto configuration procedure is performed using the extracted interface identifier or the interface identifier generated by the user.

Hereinafter, the signal procedure (IPv6 address automatic setup procedure) in the user plane will be described in detail.

After the mobile station (MS) 10 sets the link local address using the interface identifier (Interface-ID) received from the GGSN 12 or the interface identifier (ID) generated by itself, The router request message ("Router Solicitation" message) (see FIG. 7A) is transmitted to the GGSN 12 performing the router function (106).

Then, the GGSN 12 periodically transmits a router advertisement message (“Router Advertisement” message) corresponding to the response message to the “Router Solicitation” message to the mobile station (MS) 10 (107). Here, the "Router Advertisement" message sets the M-flag and the L-flag to "0" to indicate that the "Stateless Auto-configuration Procedure" is used, and also the prefix and life time ( Lifetime), A-flag and the like (see FIG. 7B).

The mobile station (MS) 10 having received the "Router Advertisement" message receives an interface identifier (Interface-ID) or its own interface identifier (Interface-ID) received through step "105", and step "107". Creates a global IPv6 address using the prefix received through.

2 is a flowchart illustrating a 'stateful IPv6 address allocation method' in a conventional mobile communication system (3GPP).

In order to dynamically allocate an IPv6 address, the mobile terminal (MS) 20 accessing the mobile communication network performs a process of transmitting an "Activate PDP Context Request" message to the SGSN 21 as a session management (SM) protocol procedure. (201). Here, the "Activate PDP Context Request" message is used for activating the PDP context and establishing a service session between the mobile terminal and the core network, and includes an APN (Access Point Name), a Quality of Service (QoS), an NSAPI, an IP address, and the like. Parameters such as protocol configuration options (PCOs) for interworking protocols and services.

In particular, when the mobile station (MS) 20 requests dynamic IPv6 address assignment, the PDP address IE of the message is set to "0" and transmitted to the SGSN 21, and the SGSN 21 receiving the message is sent to the SGSN 21. The corresponding “Create PDP Context Request” message is generated and transmitted to the GGSN 22 (202).

Then, the GGSN 22 receiving the "Create PDP Context Request" message recognizes the IPv6 address allocation method (Stateless, Stateful), and interworks with an authentication server (RADIUS server) provided by an ISP. In addition, the GGSN 22 allocates a prefix and an interface ID through its own prefix pool or by interworking with a DHCP server (203).

In this case, the interface ID generated by the GGSN 22 should be different from the interface ID of the MS, and 'Prefix' is a link local prefix (eg For example, FE80 :: / 64) is used.

When the GGSN 22 performing the above procedure generates a "Create PDP Context Response" message including an IPv6 address composed of a prefix and an interface ID and transmits the message to the SGSN 204 (204), Upon receipt of this message, SGSN 21 stores the corresponding IPv6 address and transmits the " Activate PDP Context Accept " message to mobile terminal (MS) 20 (205).

After receiving the "Activate PDP Context Accept" message, the mobile terminal (MS) 20 recognizes that the signaling procedure of the control plane is completed, and extracts the interface identifier (Interface-ID) from the received "Activate PDP Context Accept" message. In the user plane, an IPv6 auto configuration procedure is performed using the extracted interface identifier or interface-ID.

Hereinafter, the signal procedure of the user plane (IPv6 automatic setup procedure) will be described in detail.

The mobile terminal (MS) 20 sets the link local address using the interface identifier (Interface-ID) received from the GGSN 22, and then sends a "Router" to the GGSN 22 performing the router function. Solicitation "message is sent (206).

Then, the GGSN 22 periodically transmits a "Router Advertisement" message corresponding to the response message to the "Router Solicitation" message to the MS 20 (207). Here, the "Router Advertisement" message sets the M-flag to "1" to inform that it is a "stateful IPv6 address auto configuration procedure." Unlike in FIG. 1, a prefix is not included. Do not.

Unlike in FIG. 1, a mobile terminal (MS) 20 receiving a "Router Advertisement" message is assigned a stateful IPv6 address by performing a DHCPv6 procedure according to 'RFC 3315' in conjunction with a DHCP server of an ISP (220). ).

When performing the DHCPv6 procedure 220, the GGSN 22 performs a message relay procedure by performing a DHCP relay function between the MS and the DHCP server. The DHCPv6 procedure sends a request message ("Solicit" message) to the GGSN 22 in order to find a DHCP server (221), the GGSN 22 receives the "Relay-Forward" The message is transmitted to the DHCP server side (222).

When the DHCP server receiving the "Relay-Forward" message sends a "Reply" message to the GGSN 22 containing the IP address of the DHCP server as a response to the message (223), the GGSN 22 sends a "Relay" The message “Advertise” included in the message is transmitted to the MS 20 (224).

After receiving the " Advertise " message, the mobile station (MS) 20 selects a DHCP server and sends a " Request " message to the GGSN 22 to request an IP address (225). 22 transmits the "Relay-Forward" message to the DHCP server (226).

The DHCP server receiving the " Relay-Forward " message sends a " Relay-Reply " message containing the IP address of the requesting mobile station (MS) to the GGSN 22 (227), and receives the GGSN (22). ) Transmits the "Reply" message to the mobile terminal (MS) 20 (228).

Meanwhile, the GGSN 22 transmits a "Reply" message to the MS 20 (228), and then modifies the PDP to set a 'determined IPv6A address' for the MS 20. The Modification procedure is carried out. The specific process is as follows.

When the GGSN 22 transmits an "Update PDP Context Request" message to the SGSN 21 (208), the SGSN 21 receiving the message sends a "Modify PDP Context Request" message to the mobile terminal (MS) 20. Transmit to 209.

Then, the mobile terminal (MS) 20 transmits a "Modify PDP Context Accept" message to the SGSN 21 in response to the "Modify PDP Context Request" message (210), and the SGSN 21 receiving the message. This " Update PDP Context Response " message is transmitted to the GGSN 22 (211). By doing so, the PDP modification procedure is terminated, and the stateful IPv6 address allocation procedure of the MS is also terminated.

As described above, in the conventional mobile communication system, in order to allocate an IPv6 address, control is performed through signaling and interworking between a mobile terminal (MS) and a plurality of functional nodes (GGSN / SGSN) on a core network. IPv6 address assignment procedure is performed through control plane setup procedure and IPv6 based user plane signaling exchange procedure.

As described above, the conventional IPv6 address allocation method through the two-step message exchange procedure can cause a large delay in the initial IP configuration of the mobile terminal by performing a complex signal exchange procedure, in particular, the region included in different domains When the mobile terminal is handed over, there is a problem in that the flexibility of the service cannot be guaranteed.

In addition, when performing a plurality of signaling procedures as in the conventional IPv6 address allocation method, not only is the resource efficiency low in a mobile communication system using limited radio resources, but also the control plane of the target 3GPP Evolution system. The problem is that it does not meet the goal of minimizing delay.

In the prior art as described above, since the session establishment procedure of the control plane and the user plane procedure are separated, and the IP address is assigned through a multi-step message exchange procedure, the IP address of the mobile terminal MS is obtained. There is a problem of delaying acquisition and also causing waste of radio resources due to redundant use of radio section resources, and it is an object of the present invention to solve such problems.

That is, the present invention dynamically allocates an IP address in conjunction with a session management protocol procedure in allocating an Internet Protocol (IP) address to a mobile terminal in an IP-based mobile communication system, thereby simplifying the address assignment procedure and quickly. An object of the present invention is to provide a dynamic IP address allocation method for a mobile terminal in a mobile communication system, which can allocate an IP address and thereby increase the efficiency of radio resource utilization.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to solve the above object, the present invention is characterized by assigning an IP address by interworking with a session setup procedure of a control plane and an address assignment procedure of a user plane.

That is, the present invention relates to a session management protocol procedure in allocating an Internet Protocol (IP) address (for example, an IPv6 address) to a mobile terminal in an IP-based mobile communication system (for example, 3GPP Evolution system). It is characterized by dynamically allocating IP address.

More specifically, the present invention, in a stateless dynamic IP address allocation method for a mobile terminal in an Internet Protocol (IP) based mobile communication system, PDP (Packet) containing a router request from the mobile terminal side A PDP activation request step of receiving a Data Protocol) context activation request message; An address obtaining step of obtaining a global IP address of the mobile terminal by performing a router request and a router advertisement procedure on behalf of the mobile terminal according to the router request; And an address transmission step of transmitting the obtained global IP address to the mobile terminal by putting the acquired global IP address in a PDP context activation acceptance message.

In addition, the present invention, in a stateful dynamic IP address allocation method for a mobile terminal in a mobile communication system based on the Internet Protocol (IP), PDP context activation request message including a router request from the mobile terminal side PDP activation request step of receiving; Generating a link local address of the mobile terminal according to the router request; A global address obtaining step of obtaining a global IP address of the mobile terminal through interworking with an Internet service provider (ISP) using the generated link local address; And an address transmission step of transmitting the obtained global IP address to the mobile terminal by putting the acquired global IP address in a PDP context activation acceptance message.

The present invention as described above, in the IP-based next-generation mobile communication system by assigning the IPv6 address of the mobile terminal (MS) through the 'interworking' of the 'signal procedure of the control plane' and 'IP protocol control procedure of the user plane', It can solve the problems of procedure complexity and processing delay that occurred in the existing method of separating and processing both procedures, and also increase efficiency in terms of utilization of radio resources.

That is, the present invention has the effect of reducing the number of signaling exchange procedures for allocating IPv6 addresses and reducing the overall delay by interworking the control plane procedure and the user plane procedure in an IP-based next generation mobile communication system. In particular, when a 3GE mobile terminal using IPv6 moves, there is an effect of minimizing a delay in obtaining an IPv6 address.

In addition, in the present invention, by allowing the MME / UPE to act as a proxy for obtaining an IPv6 address, it is possible to simplify the signaling procedure through the radio section, especially in the case of stateful IPv6 address assignment By excluding the PDP modification procedure that occurs after the DHCP procedure, there is an effect to minimize the cost of transmitting and processing the message.

Currently, 3GPP is progressing standardization of IP-based (IPv4 and IPv6) mobile communication systems capable of high-speed data transmission and providing various multimedia services.

The present invention relates to a method of dynamically allocating an Internet (IPv6) address to a mobile terminal through interworking of a session management protocol and an internet protocol of a corresponding mobile communication system in an IP-based next generation mobile communication system.

That is, the dynamic Internet address setting method through the interworking of the session management protocol and the Internet protocol proposed in the present invention provides an Internet address to the mobile terminal by interworking the procedure of the session management protocol of the mobile communication system with an address assignment mechanism in the IPv6-based Internet. By allocating a signal, there is an advantage of simplifying a signaling procedure required for setting an Internet address of a mobile terminal. Accordingly, the present invention can be applied to an IPv6-based mobile communication system to provide IP mobility of a mobile terminal and to improve overall system performance by reducing a delay required when a user establishes a session.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a network diagram of an IP-based next generation mobile communication system (3GPP Evolution) to which the present invention is applied.

The mobile terminal 300 is a mobile terminal having a wireless access function and a data transmission protocol processing function to a 3GPP evolution system (3GE), by itself or through a terminal equipment (TE) such as a personal computer (301). To provide services. In this specification, a function including a function of a user equipment (UE) 302 and a function of a terminal device (TE) 301 is regarded as a function of a mobile terminal (MS) 300.

The 3GE system network includes an Evolved Node B (E-Node B) 311 and a Mobility Management Entity (MME) / User Plane Entity (UPE) 312. The E-Node B 311 serves as a base station of a mobile communication system and performs radio (RF) reception processing, a physical layer (PHY) function, a media access control (MAC) function, and radio resource management. RRC (Radio Resource Control) function.

The MME / UPE 312 performs interworking with a plurality of E-Node Bs 311 to perform mobility management and session management functions of the 3GE mobile terminal. In addition, the MME / UPE 312 operates in conjunction with the operator's network for subscriber management and SIP-based services.

The Session Management (SM) protocol in the 3GE system as shown in FIG. 3 operates in the user equipment (UE) 302 and the MME / UPE 312, and establishes a user's service session and PDP context. It performs the management function of). Therefore, the signaling procedure for session management of the control plane is performed between the user equipment (UE) 302 and the MME / UPE 312, using a control message for PDP management in the existing 3GPP.

Referring to the MME / UPE 312 with respect to IP address allocation described in FIG. 4 and FIG. 5, in the 3GE system, the MME / UPE 312 serves as a session management function and an IP gateway of the 3GE system. And UPE may be implemented in separate systems, or may be implemented in different functional blocks (functional entities) in one system.

In relation to IP address allocation according to the present invention, the MME is a block for performing a session management function, and the UPE may be referred to as a block for performing an IP gateway. In the present invention, an MME (session) Management block) transmits a "Router Solicitation" message received from the mobile terminal to an IP gateway block (UPE), and in response, the UPE (IP gateway block) transmits a "Router Advertisement" message to a session management block (MME). do. At this time, the "Router Solicitation" message and the "Router Advertisement" message use an interface defined between the MME and the UPE.

That is, in the present invention, the MME (session management block) on behalf of the mobile terminal (MS), the router request (RS) / router advertisement (RA) procedure between the MME (session management block) and UPE (IP gateway block) (403, 503 and 509 are performed.

4 is a flowchart illustrating a stateless dynamic address allocation method for a mobile terminal in an IP-based mobile communication system according to the present invention, and is a stateless type performed by the MME / UPE 312. Shows the process of stateless IPv6 address allocation.

That is, FIG. 4 illustrates a stateless IPv6 address allocation procedure when the mobile terminal 300 establishes an initial session in the 3GE system structure as shown in FIG. 3.

The present invention operates by interlocking 'control plane control procedures' and 'user plane control procedures' for IPv6 address allocation, thereby reducing the number of message procedures transmitted / received between functional entities and radio resources. It has the effect of minimizing the consumption, and performs the stateless IPv6 address allocation process through the following detailed procedures.

In order to establish a session for the service requested by the user, the mobile terminal 300 (more precisely, the UE 302 in FIG. 3, etc.) generates an "Activate PDP Context Request" message to generate an MME / UPE message. And transmits to 312 (401). In FIG. 3, although the mobile terminal 300 transmits directly to the MME / UPE 312, the mobile terminal 300 may be transmitted through another entity (eg, an E-node B) according to an embodiment. The same applies to the embodiment of FIG. 5.

Here, the "Activate PDP Context Request" message uses a message presented in the existing 3GPP (Rel-6), but in order to request a dynamic allocation of IPv6 address, "PDP Address IE" is set to "0". In addition, an information element (IE) included in an "Activate PDP Context Request" message includes information for a router solicitation (router request message) (see FIGS. 7A and 9A) and an IPv6 address request indication (FIG. 9a of FIG. 9a), which allows the MME / UPE 312 to perform the IPv6 address auto-configuration procedure, which was performed at the user plane after the PDP activation procedure.

Meanwhile, the session management block of the MME / UPE 312 that receives the "Activate PDP Context Request" message from the mobile terminal 300, authenticates for a 'stateless IPv6 address auto configuration procedure'. (Authentication) and configuration (Configuration) procedure is performed (402). Here, the authentication and setup procedure 402 is not an essential procedure but an optional procedure, and authentication is performed through interworking with a RADIUS (Remote Authentication Dial-In User Service) server.

When the authentication and setup procedure 402 is completed, the MME / UPE 312 uses an ICMP protocol message included in the received “Activate PDP Context Request” message, and the IPv6 address to be used by the MS 300. Assign a (Global IPv6 Address).

In the 3GE system, the MME / UPE 312 serves as a session management function and an IP gateway of the 3GE system. As described with reference to FIG. 3, the session management block represents a function block of the MME, and the IP gateway block represents a UPE. Represents a functional block.

The session management block of the MME / UPE 312 sends a "Router Solicitation" message included in the received "Activate PDP Context Request" message to the IP gateway block of the MME / UPE 312, and in response, the IP gateway block. Transmits a "Router Advertisement" message to the session management block, and is assigned an IPv6 address for the MS 300 through this process (RS / RA procedure) 403.

Hereinafter, an RS / RA procedure 403 performed between a session management block (MME) and an IP gateway block (UPE) and a corresponding global address (global IPv6 address) acquisition process 404 will be described in detail.

The session management block of the MME / UPE 312 sends a "Router Solicitation" message included in the "Activate PDP Context Request" message to the IP gateway block.

Then, the IP gateway block obtains an interface identifier (ID) and prefix information, and then, obtains a source link address including the acquired interface identifier (ID) and the obtained prefix ( Prefix) and generates a "Router Advertisement" message using the information, and transmits the generated "Router Advertisement" message to the session management block (403). In addition, the IP gateway block generates a global IPv6 address of the mobile station (MS) 300 using the obtained interface-ID and prefix information, and transmits the global IPv6 address to the session management block. The MME / UPE 312 is to obtain a global IPv6 address (404).

Subsequently, the session management block of the MME / UPE 312 having obtained the global IPv6 address transmits an “Activate PDP Context Accept” message including the global IPv6 address to the corresponding mobile terminal (MS) 300 (405). At this time, in the PCO field of the "Activate PDP Context Accept" message transmitted to the MS 300, the "Router Advertisement" message acquired by the session management block (see FIGS. 7B and 9B), and an IPv6 address response indication (FIG. (See 911 in 9b).

In addition, the MME / UPE 312 stores the global IPv6 address in the PDP context for transmission of downlink traffic transmitted to the mobile terminal (MS) 300 (406).

FIG. 5 is a flowchart illustrating a stateful dynamic address allocation method for a mobile terminal in an IP-based mobile communication system according to the present invention, in which an MME / UPE 312 works with an ISP 313 to allocate a dynamic address. It shows the process of assignment.

That is, FIG. 5 illustrates a 'stateful IPv6 address allocation procedure' performed by the mobile terminal at the time of initial session establishment in the 3GE system structure as shown in FIG. 3.

The present invention operates by interworking control plane control procedure and user plane control procedure for IPv6 address assignment. In addition, the stateful IPv6 address allocation method according to the present invention is similar to the stateless IPv6 address allocation method, but is present in the ISP 313. The assignment of the IPv6 address of the MS 300 using a Dynamic Host Configuration Protocol (DHCP) server is different from the 'stateless IPv6 address allocation' procedure.

Therefore, in the present invention, in order to allocate an IPv6 address of the mobile terminal (MS) 300, the MME / UPE 312 plays a role of a DHCP client, and works in conjunction with a DHCP server existing in an ISP. Obtain an IPv6 address.

Hereinafter, a method of stateful IPv6 address allocation according to the present invention will be described in detail with reference to FIG. 5.

In order to establish a session for the service of the user, the mobile terminal 300 (more precisely, the UE 302 in FIG. 3, etc.) sends an "Activate PDP Context Request" message to the MME / UPE 312. Transmit (501).

Here, the "Activate PDP Context Request" message uses a message presented in the existing 3GPP (Rel-6), but "PDP Address IE" is set to "0" in order to request dynamic allocation of IPv6 addresses. In addition, the information element (IE) included in the "Activate PDP Context Request" message includes information for router solicitation (router request message (see FIGS. 7A and 9A) and IPv6 address request indication (see FIG. 9A)). In this way, the IP address autoconfiguration procedure, which was performed in the user plane after the PDP activation procedure, can be performed in the MME / UPE 312.

On the other hand, the session management block of the MME / UPE 312 receiving the "Activate PDP Context Request" message, the authentication procedure for the "stateful IPv6 address auto configuration procedure" (this is not an essential procedure) It is an optional procedure, and is performed through interworking with a RADIUS server) and a setting procedure (502). Then, the session management block of the MME / UPE 312 sends a "Router Solicitation" message included in the "Activate PDP Context Request" message to the IP gateway block of the MME / UPE 312. Then, the IP gateway block of the MME / UPE 312 receiving the "Router Solicitation" message obtains a link local prefix and an interface identifier (ID) (503). Thereafter, the IP gateway block of the MME / UPE 312 generates a link local address of the mobile terminal 300 using the obtained link local prefix and the interface identifier ID (504). The IP gateway block of the MME / UPE 312 performs interworking with the ISP 313 using the generated link local address, which will be described in "505" to "508".

The RS procedure 503 and the link local address generation procedure 504 are described in more detail below.

When the step "502" ends, the session management block of the MME / UPE 312 extracts a "Router Solicitation" message from the "Activate PDP Context Request" message and transmits it to the IP gateway block. Accordingly, the IP gateway block obtains an interface identifier (Interface-ID) and a Link Local Prefix (e.g., FE80 :: / 64), and uses the obtained information to establish a link local address (Link). local IPv6 address) is generated (504).

Here, the process of obtaining the 'Link Local Prefix' by the IP gateway block of the MME / UPE 312 may be performed in two ways. In the first case, the IP gateway block of the MME / UPE 312 is obtained by using an internal prefix pool. In the second case, the IP gateway block of the MME / UPE 312 is DHCP of the ISP 313. This is the case obtained through interworking with the server. As such, interworking with a DHCP server is not essential but is a procedure that can be selectively performed.

In short, through the RS procedure 503 and the link local address generation procedure 504 as described above, the MME / UPE 312 is connected to the link local of the mobile terminal (MS) 300 requested through the PDP activation procedure. Obtain an IPv6 address (Link local IPv6 address).

That is, when the authentication and setup procedure 502 is completed, the MME / UPE 312 uses the ICMP protocol message included in the "Activate PDP Context Request" message to link-local IPv6 of the mobile terminal (MS) 300. Create an address.

Next, a process of obtaining a global IP address of the mobile terminal 300 using the link local IPv6 address obtained through the router request (RS) procedure 503 and the link local address generation procedure 504 will be described. .

&Quot; 505 " to " 508 " indicate that the IP gateway block of the MME / UPE 312 performs a DHCP procedure in association with a DHCP server of the ISP 313 using a link local IPv6 address. This is the process of obtaining a stateful IPv6 address (global IP address) through the procedure.

Specifically, the IP gateway block of the MME / UPE 312 requests a DHCP procedure by transmitting a request message (“Solicit” message) to the DHCP server in association with the session management block (505). Here, the "Solicit" message is a message that the DHCP client transmits to all DHCP relay agents and DHCP servers in order to find a DHCP server, which is transmitted by the IP gateway block.

Then, the DHCP server receiving the "Solicit" message from the IP gateway block transmits an advertisement message ("Advertise" message) to the IP gateway block (506) meaning that it can perform the operation as a DHCP server (506). Here, the "Advertise" message may be received from a plurality of DHCP servers, in which case a specific DHCP server is selected according to the determination of the IP gateway block of the MME / UPE 312.

Meanwhile, in order to request an IPv6 address (global IP address) and configuration information, the IP gateway block of the MME / UPE 312 receiving the "Advertise" message sends a request message ("Request" message) to the "506" step. In step 507, it transmits to the selected DHCP server.

Then, the DHCP server receiving the "Request" message transmits a response message ("Reply" message) including the assigned IPv6 address (global IP address) and configuration information (global prefix information, etc.) to the IP gateway block (508). ).

In this case, the IP gateway block of the MME / UPE 312 obtains a global IP address and setting information (global prefix information, etc.) from the received "Reply" message, and uses the obtained information to obtain a "Router Advertisement" message ( That is, a response message to a "Router Solicitation" message of "503" is generated and transmitted to the session management block of the MME / UPE 312 (509). Here, the "Router Advertisement" message also includes a source link address including an interface identifier obtained in step 503.

Meanwhile, after the global IP address acquisition and router advertisement (RA) procedure 509 is performed, the session management block of the MME / UPE 312 is transmitted to the mobile terminal (MS) 300 through the "505" to "508". The global IPv6 address allocated to the PDP address IE of the "Activate PDP Context Accept" message is included and transmitted to the mobile terminal (MS) 300 (510). As a result, the IPv6 address allocation procedure of the mobile station MS is terminated. Here, the PCO field of the "Activate PDP Context Accept" message includes a "Router Advertisement" message (see FIGS. 7B and 9B) and an IPv6 address response indication (see 911 of FIG. 9B).

In addition, the MME / UPE 312 stores the global IPv6 address of the allocated mobile station (MS) in a PDP context (511) for downlink data transmission.

FIG. 6A is a structure diagram of an PDP context activation request message presented by a 3GE system.

The "Activate PDP Context Request" message is used to activate a PDP context and establish a service session between a mobile terminal and a core network. This includes a transaction identifier, a protocol discriminator, and a message type. (Message Type), Request NSAPI (Request NSAPI), Request LLC SAPI (Request LLC SAPI), Request Quality of Service (Request QoS), Request PDP Address, Request Point Name (APN), and Parameters such as a Protocol Configuration Option (PCO) 600 for a service are included.

In the present invention, in order to perform the PDP activation procedure, in the 'PCO' field 600 in the PDP context activation request message (“Activate PDP Context Request” message) having the structure as shown in FIG. Solicitation "message) '(see Fig. 7a) is added.

That is, the structure of the "Activate PDP Context Request" message is expanded to accommodate the "Router Solicitation" message (refer to FIG. 7A) provided by the 'RFC 2461' to the existing PCO IE 600.

FIG. 6B is a structure diagram of an PDP context activation accept message presented by a 3GE system.

Activate PDP Context Accept message, as shown in the figure, the Transaction Identifier (Transaction Identifier), Protocol Discriminator, Message Type, Negotiated LLC SAPI (Negotiated LLC SAPI) Parameters such as negotiated quality of service (Negotiated QoS), radio priority (Radio Priority), PDP address (PDP Address), protocol configuration option (PCO) 610, packet flow identifier (Packet Flow Identifier) are included.

In particular, in the present invention, in order to perform the PDP activation procedure, in the 'PCO' field 610 in the PDP context activation accept message (“Activate PDP Context Accept” message) having the structure as shown in FIG. "Router Advertisement" message) (see Figure 7b) is added to encapsulate.

That is, the "Activate PDP Context Accept" message used in the present invention has a structure that can accommodate the "Router Advertisement" message (refer to FIG. 7B) suggested by the 'RFC 2461' to the existing PCO IE 610. It is an extension.

FIG. 7A shows a structure diagram of a router solicitation message shown in 'RFC 2461', and FIG. 7B shows a structure diagram of a router advertisement message shown in 'RFC 2461'.

As shown in the figure, the message " Router Solicitation " shown in 'RFC 2461' includes a message type, a check sum for error correction, a source link-layer address, and the like. Included. Here, the source link address (Source Link-Layer Address) corresponds to the identification information of the mobile terminal (300).

On the other hand, the "Router Advertisement" message presented in 'RFC 2461' includes a message type, a hop hop limit, a check sum for error correction, a router life time, and a reachable time. (Reachable Time), a Retransmission Timer, a Source Link-Layer Address, and Prefix Information. Here, the source link address (Source Link-Layer Address) corresponds to the identification information of the mobile terminal 300, and was transmitted through a "Router Solicitation" message.

However, when the M field is set in the "Router Advertisement" message, the mobile station will know that it is a stateful IPv address allocation. In this case, the prefix information field 70 is not included because it is an optional field.

8 is a structural diagram of an embodiment of a protocol setting option (PCO) field modified according to the present invention.

As shown in the figure, the 'Protocol Configuration Option (PCO)' field includes a protocol configuration option information element identifier (PCO IEI) 81, a length 82 of PCO contents, and protocol configuration information. It is made in the form including (83), and further includes a protocol setting option list 84 and an additional parameter list (85).

Here, the protocol setting option (PCO) list 84 is a part indicating the contents of the protocol-specific setting options (PCO), and includes a protocol ID, a length of the corresponding protocol content, and a corresponding protocol content. In particular, 'Protocol ID' defines LCP, PAP, CHAP, IPCP, etc. according to the ID value.

Meanwhile, the additional parameter list 85 includes values that need to be transferred between the mobile terminal and the network, and includes a container ID, a length of the corresponding container content, and a corresponding container content. In particular, 'Container ID' means P-CSCF Address Request / Response, IM CN Subsystem Signaling Flag, DNS Server Address Request / A response (DNS Server Address Request / Response), a Policy Control rejection code, an IPv6 Address Request / Response 851, etc. are defined.

Here, 'IPv6 Address Request / Response' 851 is newly defined according to the present invention, and "IPv6 Address Request" is an indication (IP address request indication of a specific format) indicating that it is a request of an IP address having an IPv6 address system. It is stored in the PCO 600 of the "Activate PDP Context Request" message. The " IPv6 Address Response " is an indication indicating that an IP address having an IPv6 address system is allocated (a specific type of IP address response indication) and is stored in the PCO 610 of the " Activate PDP Context Accept " message.

FIG. 9A is a diagram illustrating an embodiment of an information entity for transmitting Router Solicitation information through the PCO IE of the “Activate PDP Context Request” message of FIG. 6A according to the present invention.

In the present invention, as shown in FIG. 9A, in the PCO field 600 of the "Activate PDP Context Request" message, a container ID 901 indicating an 'IPv6 Address Request' 851 and corresponding contents are included. Information element (IE), such as a length 902 of < RTI ID = 0.0 > and a < / RTI > Router Solicitation message (903, see FIG. 7A) corresponding to the content. These mean ICMP information received from the user's mobile terminal.

That is, the indication of requesting an IPv6 address is defined through the container ID 901, and a "Router Solicitation" message (FIG. 7A) is stored in the corresponding container content field.

FIG. 9B is a diagram illustrating an embodiment of an information entity for transmitting Router Advertisement information through the PCO IE of the “Activate PDP Context Accept” message of FIG. 6B according to the present invention.

In the present invention, as shown in FIG. 9B, in the PCO field 610 of the "Activate PDP Context Accept" message, a container ID 911 indicating an IPv6 Address Request 851, corresponding content Information element (IE), such as the length of 912, and a Router Advertisement message 913 (see FIG. 7B) corresponding to the content. These mean ICMP information to be transmitted to the user's mobile terminal.

That is, an indication of allocating an IPv6 address is defined through the container ID 911, and a "Router Advertisement" message (FIG. 7B) is stored in the corresponding container content field.

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

1 is a flowchart illustrating a method for stateless IPv6 address allocation in a conventional mobile communication system (3GPP);

2 is a flowchart illustrating a method of stateful IPv6 address allocation in a conventional mobile communication system (3GPP);

3 is a network diagram of an IP-based next generation mobile communication system (3GE: 3GPP Evolution) to which the present invention is applied;

4 is a flowchart illustrating a stateless dynamic address allocation method for a mobile terminal in an IP-based mobile communication system according to the present invention;

5 is a flowchart illustrating a stateful dynamic address allocation method for a mobile terminal in an IP-based mobile communication system according to the present invention;

6A is a structural diagram of an PDP context activation request message presented by a 3GE system;

6B is a structural diagram of an PDP context activation accept message presented by a 3GE system;

7A is a structural diagram of a router solicitation message presented in RFC 2461;

7b is a structural diagram of a router advertisement message shown in RFC 2461;

8 is a diagram illustrating an embodiment of a protocol setting option (PCO) field modified according to the present invention;

FIG. 9A is a diagram illustrating an embodiment of an information entity for transmitting router request information through a PCO IE of an “Activate PDP Context Request” message of FIG. 6A according to the present invention; FIG.

FIG. 9B is a diagram illustrating an embodiment of an information entity for transmitting router advertisement information through a PCO IE of an “Activate PDP Context Accept” message of FIG. 6B according to the present invention.

* Explanation of symbols on the main parts of the drawing

300: mobile terminal (MS) 311: E-nose (Evolved Node)

312: Mobility Management Entity / User Plane Entity (MME / UPE)

313: Internet Service Provider (ISP)

Claims (18)

A stateless dynamic IP address allocation method for a mobile terminal in an internet protocol (IP) based mobile communication system, A PDP activation request step of receiving a PDP (Packet Data Protocol) context activation request message including a router request from the mobile terminal; An address obtaining step of obtaining a global IP address of the mobile terminal by performing a router request and a router advertisement procedure on behalf of the mobile terminal according to the router request; And An address transmission step of transmitting the obtained global IP address to a PDP context activation acceptance message to the mobile terminal; Stateless dynamic IP address allocation method for a mobile terminal comprising a. The method of claim 1, Storing the obtained global IP address in a PDP context so that downlink traffic for the mobile terminal can be transmitted Stateless dynamic IP address allocation method for a mobile terminal further comprising. The method of claim 1, The PDP context activation request message is In the Protocol Configuration Option (PCO) field, stateless dynamic storage for a mobile terminal characterized by storing an indication (IP format request indication in a specific format) and a router request message indicating that the request is for an IP address having a specific address system. How to assign an IP address. The method of claim 3, wherein The specific format of the IP address request indication is Defined through a container ID, The router request message is A stateless dynamic IP address allocation method for a mobile terminal, which is stored in a corresponding container content field. The method of claim 1, The address obtaining step, And obtaining a global IP address of the mobile terminal through a router request procedure and a router advertisement procedure between a mobility management entity (MME) and a user plane entity (UPE). The method of claim 5, wherein The address obtaining step, Sending, by the mobility management entity (MME), a router request message included in the PDP context activation request message to the user plane entity (UPE); Obtaining, by the user plane entity (UPE), an interface identifier (ID) and prefix information; And Generating, by the user plane entity (UPE), a router advertisement message and a global IP address of the mobile terminal using the obtained interface identifier (ID) and prefix information, and transmitting the generated router advertisement message to the mobility management entity (MME); Stateless dynamic IP address allocation method for a mobile terminal comprising a. The method of claim 6, The PDP context activation acceptance message is In the PDP address field, the global IP address is stored, and in the protocol setting option (PCO) field, an indication indicating that an IP address having a specific address system is allocated (IP address response indication of a specific format) and the router advertisement message are stored. Stateless dynamic IP address allocation method for a mobile terminal, characterized in that. The method of claim 7, wherein The specific format of the IP address response display is Defined through a container ID, The router advertisement message is, A stateless dynamic IP address allocation method for a mobile terminal, which is stored in a corresponding container content field. A stateful dynamic IP address allocation method for a mobile terminal in an internet protocol (IP) based mobile communication system, A PDP activation request step of receiving a PDP context activation request message including a router request from the mobile terminal; Generating a link local address of the mobile terminal according to the router request; A global address obtaining step of obtaining a global IP address of the mobile terminal through interworking with an Internet service provider (ISP) using the generated link local address; And An address transmission step of transmitting the obtained global IP address to a PDP context activation acceptance message to the mobile terminal; Stateful dynamic IP address allocation method for a mobile terminal comprising a. The method of claim 9, Storing the obtained global IP address in a PDP context so that downlink traffic for the mobile terminal can be transmitted Stateful dynamic IP address allocation method for a mobile terminal further comprising. The method of claim 9, The link local address generation step, Sending, by the mobility management entity (MME), a router request message included in the PDP context activation request message to the user plane entity (UPE); Obtaining, by the user plane entity (UPE), a link local prefix and an interface identifier; And Generating, by the user plane entity (UPE), a link local address of the mobile terminal using the obtained link local prefix and an interface identifier (ID). Stateful dynamic IP address allocation method for a mobile terminal comprising a. The method of claim 11, The link local prefix is Obtain state through interworking with the DHCP server of the Internet service provider (ISP), or using a prefix pool (Prefix Pool) of the user plane entity (UPE) state-saving dynamic for the mobile terminal How to assign an IP address. The method of claim 9, The PDP context activation request message is Stateful dynamic IP for a mobile terminal, characterized by storing an indication indicating a request of an IP address having a specific address system (indicated form of an IP address request) and a router request message in a protocol setting option (PCO) field. Address assignment method. The method of claim 13, The specific format of the IP address request indication is Defined through a container ID, The router request message is Stateful dynamic IP address allocation method for a mobile terminal, characterized in that stored in the container content field. The method of claim 9, The global address obtaining step, Preserving the state for the mobile terminal, characterized in that to perform a DHCP procedure in conjunction with the DHCP server of the ISP using the link local address, and obtain a global IP address for the mobile terminal from the DHCP server through the DHCP procedure. Dynamic IP address assignment. The method of claim 15, Obtaining a global prefix from the DHCP server through interworking with the DHCP server of the ISP using the link local address; And Generating a router advertisement message including the obtained global prefix Stateful dynamic IP address allocation method for a mobile terminal further comprising. The method of claim 16, The PDP context activation acceptance message is In the PDP address field, the acquired global IP address is stored, and in the protocol setting option (PCO) field, an indication indicating that an IP address having a specific address system is allocated (IP address response indication of a specific format) and the router advertisement message are displayed. Stateful dynamic IP address allocation method for a mobile terminal, characterized in that for storing. The method of claim 17, The specific format of the IP address response display is Defined through a container ID, The router advertisement message is, Stateful dynamic IP address allocation method for a mobile terminal, characterized in that stored in the container content field.

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