KR100980852B1 - Method and system for applied preservation of binding information management in proxy mobile ip network - Google Patents

Abstract

The present invention relates to a binding session management method and system to which preservation is applied in a proxy mobile IP (PMIP) network.

According to the present invention, a system for managing a binding session to which a preservation is applied is registered as a preservation to a home agent managing a binding session according to entry of a preservation of the mobile terminal, where the preservation registration is a preservation mode of the mobile terminal. To register the preservation information in the binding session information of the mobile terminal according to the external agent requesting the preservation registration request and to the external agent that the preservation registration is completed. Inform includes a home agent.

As a result, by applying the preservation function in the PMIP network, the repeated repetition of the PMIP re-registration process can be used to efficiently save resources in the wireless section as well as in the wireless section.

Proxy Mobile IP (PMIP), Preservation, GGSN, Home Agent

Description

METHOOD AND SYSTEM FOR APPLIED PRESERVATION OF BINDING INFORMATION MANAGEMENT IN PROXY MOBILE IP NETWORK}

The present invention relates to a binding session management method and system to which preservation is applied in a proxy mobile IP network. In particular, the present invention relates to a binding session management method and system to which a preservation function is applied for the efficiency of radio and wired resources in a proxy mobile IP (PMIP) network of WCDMA.

The development of the existing Internet is dominated by wire-based infrastructure.

However, in recent years, there is a trend that the infrastructure for ensuring mobility for wireless data services in a heterogeneous network environment based on wireless has been in the spotlight. Heterogeneous wireless networks have different types of networks, such as WLAN, High Speed Downlink Packet Access (HSDPA), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), WiBro (also known as WiMAX), and WiFi (WiFi). Wireless Fidelity) network.

In order to guarantee mobility throughout wired and wireless, a method using mobile IP is mainly used, and roaming between heterogeneous networks is widely used. In the case of the mobile IP, the mobile IP stack is implemented in the mobile terminal and is a representative mobility support method for supporting mobility.

However, in the case of such a mobile IP, because of the burden of implementing a separate mobile IP stack in a mobile terminal, a proxy mobile IP (hereinafter referred to as 'PMIP') that accommodates mobility in a network without implementing a separate stack in a terminal is called. Method) is in the spotlight.

Meanwhile, a method of accessing and re-registering a PMIP in a conventional WCDMA network will be described with reference to FIGS. 1 and 2.

1 is a flowchart illustrating a PMIP access and re-registration procedure in a conventional WCDMA network.

Referring to FIG. 1, when the switch 100 receives an PDP context activation request from a mobile terminal 10 of a subscriber that performs a wireless network access procedure according to a service request, A PDP context creation request message (Create PDP Context REQ) is generated accordingly and transmitted to an external agent (hereinafter referred to as FA) 200 (S101, S102, and S103).

The FA 200 exchanges an access request message and an access response message for the authentication procedure for the subscriber of the mobile terminal 10 with the authentication server (AAA) 400 (S104 and S105). .

If the authentication is successful, the FA 200 is to negotiate a lifetime in the message when the PMIP is initially connected. That is, the FA 200 sets a lifetime in a PMIP registration request message for initial access and transmits it to a home agent (hereinafter referred to as 'HA') (S106). The HA 300 responds by putting a life time determined by acknowledging or changing this in a PMIP Registration Response message (S107).

The FA 200 transmits a Create PDP Context Response message according to the response to the mobile terminal 10 through the exchange 100 (S108, S109), and the subscriber mobile terminal (S108). User traffic service of the 10 is made (S110).

At this time, the lifetime included in the PMIP registration response message becomes the lifetime of the binding session. For example, if the life time between two nodes is negotiated to 1800, the FA 100 should perform the PMIP re-registration procedure within 1800 seconds.

Therefore, the FA 200 requests a PMIP Registration Request message within a lifetime negotiated with the HA 300 (1800 seconds) (S111), and according to the re-registration processing thereof from the HA 300. A PMIP Registration Response message is received (S112). At this time, the count is restarted according to the lifetime. To maintain the binding session, the PMIP re-registration procedure must be periodically performed within the negotiated lifetime. If there is no such PMIP re-registration procedure in the lifetime, the HA 200 releases the binding session (information) of the mobile terminal 10.

2 is a flowchart illustrating a preservation method in a conventional WCDMA network.

Referring to FIG. 2, descriptions of steps S201 to S210 in which a user traffic service is performed by completing PMIP registration for initial access from the mobile terminal 10 performing a wireless network access process are described with reference to FIG. 1. Omit similar to case.

If there is no traffic for the mobile terminal 10 for a predetermined time after the user traffic service, the wireless network is released and enters a preservation mode. Here, the preservation is a function for saving the resources of the radio section, the radio section of the data call connected to the mobile terminal 10 and the radio access network (RAN) transitions to the idle state, the traffic of the mobile terminal 10 Information for a service is maintained as it is. In other words, in order to ensure the efficiency of radio resources in a mobile communication network, resources of a core data network are left intact and only radio resources are returned to the network to improve efficiency of resource utilization.

However, in the case of PMIP, it was not designed considering the specificity of the preservation of the mobile communication network. Thus, there is no measure as to whether the FA 200 should continue to perform the PMIP re-registration procedure with the HA 300 for entering the preservation mode of the mobile terminal 10.

For example, even if the FA 200 must continue to perform the PMIP re-registration procedure (periodic update) to the HA 300 for entering the preservation mode of the mobile terminal 10 (S212, S213), the preservation interval continues to be long. As a result, overhead occurs due to an increase in the number of terminals performing a re-registration procedure, causing a waste of wired network resources and a load of network equipment.

Accordingly, an object of the present invention is to provide a binding session management method and system to which a preservation function is applied for efficiency of wired resources as well as radio resources in a PMC network of WCDMA.

In order to solve the above technical problem, according to an embodiment of the present invention, a method for managing a binding session to which an external agent is applied in a PMIP network performing periodic PMIP re-registration for maintaining a binding session of a mobile terminal is applied ,

a) Preservation registration of the mobile terminal when receiving the preservation entry information of the mobile terminal from outside, wherein the preservation registration is to omit the PMIP re-registration procedure in the preservation mode of the mobile terminal. Sending a message to a home agent managing a binding session; And b) stopping the PMIP re-registration request for the mobile terminal when receiving the completion of the preservation registration of the mobile terminal from the home agent.

In addition, a method for a home agent in a PMIP network that performs a periodic PMIP re-registration procedure for maintaining a binding session of a mobile terminal according to an embodiment of the present invention manages a binding session to which preservation is applied,

a) receiving a message for preservation registration of the mobile terminal from an external agent, wherein the preservation registration is to omit the PMIP re-registration procedure in the preservation mode of the mobile terminal; And b) registering preservation information in binding session information of the mobile terminal and delivering a message indicating that the preservation registration is completed to the external agent.

Meanwhile, a system for managing a binding session to which preservation is applied in a PMIP network performing a periodic PMIP re-registration procedure for maintaining a binding session of a mobile terminal according to an embodiment of the present invention,

Preservation registration to the home agent that manages the binding session in accordance with the entry of the preservation of the mobile terminal, wherein the preservation registration is to omit the PMIP re-registration procedure of the preservation mode of the mobile terminal; Foreign agents; And a home agent registering preservation information in binding session information of the mobile terminal according to the preservation registration request and informing the external agent that the preservation registration is completed.

According to the embodiment of the present invention by the above-described configuration by applying the preservation function in the PMIP network by omitting the periodically repeated PMIP re-registration process, it is possible to efficiently save not only the resources of the wireless section but also the resources of the wired section. There is this.

In addition, since the external agent and the home agent do not have to count the life time for re-registering the PMIP of the mobile terminal, there is an effect of minimizing the load of network equipment and supporting stable system operation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

Now, a binding session management method and system to which preservation is applied in a proxy mobile IP network according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram illustrating a binding session management system to which preservation is applied in a WCDMA proxy mobile IP network according to an embodiment of the present invention.

Referring to FIG. 3, a binding session management system (hereinafter referred to as a "binding session management system") to which preservation is applied in a WCDMA proxy mobile IP network according to an embodiment of the present invention is a mobile node (MN). 10), a wireless access network 110, a switch 100, a FA (Foreign Agent) 200, HA (Home Agent) 300 and the authentication server 400.

The mobile terminal 10 automatically performs a session establishment procedure in connection with a wideband code division multiple access (WCDMA) network, transmits and receives packet data, and provides voice, video communication services, and various services to subscribers subscribed to a mobile communication service and an intelligent network service. It is a terminal that provides intelligent network service and supports PMIP function.

In this specification, the mobile terminal 10 is a mobile station (MS), a terminal (terminal), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user. A device may be referred to as a user equipment (UE), an access terminal (AT), or the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.

Radio access network (hereinafter referred to as "RAN") 110 is a base station 111 that accommodates the radio access standards of the 3rd Generation Partnership Project (3GPP) standards to support the existing WCDMA and And a radio network controller (RNC) 112.

The RAN 110 receives a service request signal, a data service request signal, and uploading data from the mobile terminal 10, transmits the received data to the switch 100, and receives the service data from the switch 100 to the mobile terminal 10. Perform the function of sending to.

The base station 111 performs a radio access termination function with the mobile terminal 10 according to the 3rd Generation Partnership Project radio access standard, and transmits and receives voice, video, and data traffic in a WCDMA manner. It transmits and receives information with the mobile terminal 10 through the function and the transmission and reception antenna.

In the present specification, a base station (BS) is an access point (AP), a radio access station (Radio Access Station, RAS), a Node B (Node B), a base transceiver station (Base Transceiver Station, BTS), MMR (Mobile Multihop Relay) -BS and the like, and may include all or part of functions such as an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

The RNC 112 manages wired and wireless channels, protocol matching of the subscriber station 10, and protocol matching of the base station. Soft handoff processing, protocol matching with Core Network, General Packet Radio Service (GPRS) access, fault management, system loading, etc.

The exchange 100 may be a Serving GPRS Support Node (SGSN) in a WCDMA network and includes session management, authentication, and billing functions to handle mobility management, outgoing / incoming signal processing procedures, and packet data transmission and reception of the mobile terminal 10. And routing of packet data.

In particular, after the exchange 100 is connected to the traffic service, the exchange 100 updates the PDP context with preservation entry (Preservation = on) and preservation entry release (Preservation = off) information according to the idle state (Idle) of the mobile terminal 10. It is included in the extension parameter of the request message (Update PDP Context REQ) and delivers to the FA 200.

The FA 200 may be a network router such as a Packet Data Serving Node (PDSN), a Gateway GPRS Support Node (GGSN), etc., and may be a serving node of an IP (Internet Protocol) based packet network that provides high-speed packet data service. As an example, it manages sessions for packet data services and provides an interface for routing packet data and connecting WCDMA to the Internet.

On the other hand, the configuration of the FA 200 according to an embodiment of the present invention through FIG.

4 is a block diagram illustrating a configuration of an external agent (FA) according to an embodiment of the present invention.

Referring to FIG. 4, the FA 200 according to an embodiment of the present invention includes a communication unit 210, a determination unit 220, a timer unit 230, a message generator 240, and a controller 250. do.

The communication unit 210 exchanges 100, HA 300, and authentication server corresponding to various mobile communication networks through a wired / wireless interface so that the mobile terminal 10 can use the traffic service through the mobile network. 400) and the like.

The determination unit 220 determines an idle state of the mobile terminal 10 based on the preservation entry or preservation entry release information included in the PDP context update request message received from the exchange 100.

The timer 230 counts the operation in synchronization with the HA 300 when the mobile terminal 10 is initially connected. This is a basic operation performed because the FA 200 needs to update the lifetime and count by requesting the HA 300 to reregister the PMIP within the negotiated lifetime in order to maintain the traffic service of the mobile terminal 10. Can be.

On the other hand, when the determination unit 220 confirms the entry of the preservation of the mobile terminal 10, the timer unit 230 stops driving the timer until a separate preservation entry is confirmed.

The message generator 240 generates a message such as PMIP registration, re-registration, and deregistration for the mobile terminal 10.

In particular, when the preservation entry information is received from the exchange 100, the message generator 240 defines a reserve flag as a preservation field in the PMIP Registration REQ message. For example, the preservation flag of the PMIP registration request message is generated by setting the preservation flag = on. That is, the PMIP registration request message generated at this time may be referred to as a preservation registration request message, and is to omit an unnecessary PMIP re-registration procedure that is periodically repeated during the idle state of the mobile terminal 10.

On the other hand, when the message generator 240 receives the preservation entry release information from the exchange 100, the message generator 240 sets the preservation flag of the PMIP registration request message to Off (Preservation flag = off). That is, the PMIP registration request message generated at this time may be referred to as a preservation registration release request message. After the preservation registration is released, in order to maintain the traffic service of the mobile terminal 10, a periodic re-registration procedure must be performed according to the lifetime negotiated with the HA 300.

The controller 250 controls the overall operation of each part of the FA 200, and controls the processor and the PMIP re-registration request for preservation registration / unregistration according to the preservation entry / entry release of the mobile terminal 10. do.

Meanwhile, the HA 300 may be a router belonging to the same subnet as the home address of the mobile terminal 10, and a care of address (CoA) indicating the current location of the mobile terminal 10 and the mobile terminal 10. It stores and manages binding information of).

5 is a block diagram showing the configuration of a home agent according to an embodiment of the present invention.

Referring to FIG. 5, the HA 300 according to an embodiment of the present invention includes a communication unit 310, a message analyzer 320, a timer unit 330, a binding processor 340, and a controller 350. do.

The communication unit 310 serves to transmit and receive a message for PMIP registration in association with the FA (200).

The message analyzer 320 analyzes the PMIP registration request message received from the FA 200 to confirm the described life time, and transmits the life time determined by negotiation with the FA 200 to the timer unit 330.

The preservation field of the PMIP registration request message is checked to notify the binding processor 340 when the flag of the preservation field is set to on or off.

When the timer unit 330 receives the negotiated life time for the mobile terminal 10 from the message analyzer 320, the timer unit 330 starts counting in an operation synchronized with the FA 200.

However, when the preservation flag of the mobile terminal 10 is registered with the preservation flag on, the timer unit 330 stops the counter for the corresponding terminal which is unnecessary because the PMIP re-registration process with the FA 200 is omitted. The timer may be restarted after the preservation registration is released.

The binding processing unit 340 generates and manages binding session information according to the initial registration of the mobile terminal 10, and during the negotiated lifetime, the request for re-registering the PMIP of the mobile terminal 10 from the FA 200 is received. If not, the binding session information can be revoked.

The binding processing unit 340 additionally configures and manages the preservation field in the binding session information of the mobile terminal 10. When the preservation field is set to on, the binding processing unit 340 does not have a PMIP re-registration procedure in the lifetime. Do not revoke the binding information. In other words, the unnecessary re-registration procedure repeated periodically during the idle state of the mobile terminal 10 is omitted to maintain the preservation mode.

Subsequently, when the preservation field is changed to off, that is, when the preservation mode is released, if there is no PMIP re-registration request of the mobile terminal 10 from the FA 200 during the negotiated lifetime, the corresponding binding session. Information may be revoked.

The controller 350 controls the operation of each unit of the HA 300, and controls the overall processor for managing binding session information for the mobile terminal 10 in cooperation with the FA 200.

That is, the controller 350 controls the operation of the timer unit 330 according to the preservation information analyzed by the message analyzer 320, and moves the life time negotiation with respect to the mobile terminal 10 and the preservation mode is released. Manage periodic updates (re-registration) for the terminal 10.

The authentication server (Authentication, Authorization and Accounting, AAA) 400 performs a subscriber authentication function, a service authorization verification function, and a charging function between the mobile terminal 10 and the wireless network to which the mobile terminal 10 requests access.

Meanwhile, a binding session management method to which preservation is applied in a WCDMA PMIP network according to an embodiment of the present invention will be described with reference to FIG. 6.

6 is a flowchart illustrating a binding session management method according to an embodiment of the present invention.

Referring to FIG. 6, in the binding session management method according to an exemplary embodiment of the present invention, since the mobile terminal 10 performs a wireless network access procedure, the PMIP registration for initial access to the HA 300 is completed. The traffic service is performed, and steps S601 to S612 of re-registering the PMIP to maintain the binding session are similar to steps S101 to S112 in FIG. 1, and thus description thereof is omitted.

If there is no traffic for the mobile terminal 10 for a predetermined time after the user traffic service or the resources of the wireless network are temporarily released, it enters a preservation mode (S613).

The exchange 100 adds preservation entry (Preservation = on) information indicating an idle state of the mobile terminal 10 to the extended parameter of the PDP context update request message and transmits it to the FA 200 (S615).

Then, the FA 200 transmits the preservation flag in the PMIP re-registration request message to the HA 300 based on the preservation entry information received from the exchange 100.

The HA 300 analyzes the PMIP re-registration request message received from the FA 200, determines that the preservation flag is on, and registers the preservation field of the corresponding binding session information on. . The HA 300 then skips the PMIP re-registration procedure and the life time count with the FA 200 for the mobile terminal 10.

The HA 300 transmits a message indicating that the PMIP re-registration for the mobile terminal 10 is completed to the FA 200 (S616). Then, the FA 200 receives the notification to the exchange that the PMIP re-registration for the mobile terminal 10 is completed (S617).

At this time, the FA 200 and the exchange 100 confirm that the preservation registration of the mobile terminal 10 is completed, and then the FA 200 omits the PMIP re-registration request until the preservation registration is released.

Meanwhile, FIG. 7 illustrates a binding session management method according to registration / deregistration of preservation in a WCDMA PMIP network according to an embodiment of the present invention.

7 is a flowchart illustrating a binding session management method according to preservation registration / unregistration according to an embodiment of the present invention.

Referring to FIG. 7, in the binding session management method according to preservation registration / unregistration according to an embodiment of the present invention, there is no traffic for the mobile terminal 10 for a predetermined time after user traffic service or a resource of a wireless network. Steps S701 to S705 to temporarily release the preservation registration process are similar to steps S613 to S617 of FIG. 6.

When user traffic is generated in the mobile terminal 10 or the radio section is reconnected (S706), the switch 100 enters the preservation indicating the traffic occurrence state of the mobile terminal 10 on the extended parameter of the PDP context update request message. The information is added to the release (Preservation = off) and transmitted to the FA 200 (S707).

Then, the FA 200 transmits to the HA 300 by setting the preservation flag in the PMIP re-registration request message to off based on the preservation entry release information received from the exchange 100 (S708).

The HA 300 analyzes the PMIP re-registration request message received from the FA 200, confirms that the preservation flag is off, and releases the preservation registration of the corresponding binding session information.

The HA 300 transmits a response message indicating that PMIP re-registration (preservation deregistration) to the mobile terminal 10 is completed to the FA 200 (S709). In addition, the FA 200 that receives the notification notifies the exchange that PMIP re-registration (preservation deregistration) for the mobile terminal 10 is completed (S710).

Thereafter, a user traffic service is provided to the mobile terminal 10 (S711), and the FA 200 resumes the lifetime count negotiated with the HA 300 to repeat the periodic PMIP re-registration process (S712, S713). )

As such, according to an exemplary embodiment of the present invention, by omitting the PMIP re-registration process periodically repeated by the preservation function in the PMIP network, it is possible to efficiently save not only the resources of the wireless section but also the resources of the wired section.

In addition, since the FA 200 and the HA 300 do not have to count the life time for the PMIP re-registration of the mobile terminal 10, there is an effect of supporting stable system operation by reducing the load of network equipment.

Although the embodiments of the present invention have been described above, the present invention is not limited only to the above embodiments, and various other changes are possible.

For example, in the exemplary embodiment of the present invention illustrated in FIG. 7, when the traffic occurs in the mobile terminal 10 in steps S706 to S708, the preservation registration is released. However, the present invention is not limited thereto. In operation 230, a timer for preservation may be separately set and counted. That is, after the FA 200 receives that the preservation registration is completed, the FA 200 itself counts a preset preservation life time (at least longer than the life time for re-registration), and when the preservation life time is exceeded, the preservation time is exceeded. The flag may be set to off to request preservation deregistration.

At this time, since the counting of the preservation life time in the FA 200 is performed independently without being synchronized with the HA 300, there is an advantage of not requiring a separate operation of the HA 300.

Thereafter, if there is no traffic in the mobile terminal 10 for a predetermined time, the radio section is released to perform the preservation registration again, and maintain the preservation registration for the preservation life time set in the FA 200.

Therefore, the independent operation of the FA 200 may prevent the mobile terminal 10 from being in an indefinite preservation mode, and thus may apply the preservation at a predetermined predetermined time period.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a flowchart illustrating a PMIP access and re-registration procedure in a conventional WCDMA network.

2 is a flowchart illustrating a preservation method in a conventional WCDMA network.

3 is a block diagram illustrating a binding session management system to which preservation is applied in a WCDMA proxy mobile IP network according to an embodiment of the present invention.

4 is a block diagram illustrating a configuration of an external agent according to an embodiment of the present invention.

5 is a block diagram showing the configuration of a home agent according to an embodiment of the present invention.

6 is a flowchart illustrating a binding session management method according to an embodiment of the present invention.

7 is a flowchart illustrating a binding session management method according to preservation registration / unregistration according to an embodiment of the present invention.

Claims (15)

A method of managing a binding session to which an external agent is applied by a foreign agent in a PMIP network that performs a periodic PMIP re-registration procedure for maintaining a binding session of a mobile terminal, a) Preservation registration of the mobile terminal when receiving the preservation entry information of the mobile terminal from outside, wherein the preservation registration is to omit the PMIP re-registration procedure in the preservation mode of the mobile terminal. Sending a message to a home agent managing a binding session; And b) stopping the PMIP re-registration request for the mobile terminal when receiving the completion of preservation registration of the mobile terminal from the home agent; Binding session management method comprising a. The method of claim 1, Step a) is Generating a PMIP re-registration request message having preservation flag information based on the preservation entry information. The method according to claim 1 or 2, B), Stopping the lifetime count for the binding session of the mobile terminal. The method of claim 1, After step b) above, c) transmitting a message for canceling preservation registration of the mobile terminal to the home agent when receiving the preservation entry release information of the mobile terminal; And d) resuming the lifetime count for the binding session of the mobile terminal upon receiving from the home agent that the preservation registration of the mobile terminal has been released; The binding session management method further comprises. The method of claim 4, wherein Step d), Sending a PMIP re-registration request to maintain the binding session within the lifetime to the home agent. The method according to claim 1 or 2, After step b) above, Counting a preset preservation life time for validity of the preservation registration; Transmitting a message for canceling preservation registration of the mobile terminal to the home agent when the preservation life time is exceeded; And Resuming the lifetime count for the binding session of the mobile terminal upon receiving the release of the preservation registration of the mobile terminal from the home agent; Binding session management method comprising a. A method for a home agent in a PMIP network that performs a periodic PMIP re-registration procedure for maintaining a binding session of a mobile terminal, wherein the preservation is applied to manage a binding session. a) receiving a message for preservation registration of the mobile terminal from an external agent, wherein the preservation registration is to omit the PMIP re-registration procedure in the preservation mode of the mobile terminal; And b) registering preservation information in the binding session information of the mobile terminal and delivering a message indicating that the preservation registration is completed to the external agent; Binding session management method comprising a. The method of claim 7, wherein B), Analyzing the message for preservation registration and confirming preservation flag information based on preservation entry information of the mobile terminal; And Reflecting the preservation flag information in the preservation field of the binding session information Binding session management method comprising a. 9. The method according to claim 7 or 8, After step b) above, Stopping the binding session lifetime count of the mobile terminal and maintaining the binding session without a PMIP re-registration request. The method of claim 9, After step b) above, c) receiving a message for deregistration of the mobile terminal from the foreign agent; And d) canceling the preservation registration in the binding session information of the mobile terminal and delivering a message indicating that the preservation deregistration is completed to the external agent; Binding session management method further comprising. A system for managing a binding session to which preservation is applied in a PMIP network that performs a periodic PMIP re-registration procedure for maintaining a binding session of a mobile terminal, Preservation registration to the home agent that manages the binding session in accordance with the entry of the preservation of the mobile terminal, wherein the preservation registration is to omit the PMIP re-registration procedure of the preservation mode of the mobile terminal; Foreign agents; And A home agent that registers preservation information in binding session information of the mobile terminal according to the preservation registration request and notifies the external agent that the preservation registration is completed. Binding session management system comprising a. The method of claim 11, The external agent, A determination unit for determining a preservation entry or a preservation entry release of the mobile terminal through a message received from an exchange; A timer unit for counting a life time negotiated with the home agent for the binding session; A message generator for generating a message for requesting the preservation registration / unregistration according to the preservation entry / departure release of the mobile terminal; And Controls the overall operation of each unit, controls to transmit a message requesting the preservation registration / unregistration to the home agent, and stops the PMIP re-registration request to the home agent when the preservation registration is completed. Control unit Binding session management system comprising a. 13. The method of claim 12, The timer unit, And stop counting the life time when the preservation registration is completed. The method of claim 11, The home agent, A message analyzer for analyzing the preservation registration request received from an external agent and confirming lifetime and preservation flag information for the binding session; A timer unit for receiving a negotiated life time for the mobile terminal from the message analyzer and counting operations in synchronization with the external agent; A binding processing unit which generates and manages the binding session information and registers the preservation information in the binding session information; And Control unit for maintaining the binding session information even if there is no PMIP re-registration request within the negotiated lifetime when the preservation registration is completed Binding session management system comprising a. The method of claim 14, The control unit, The binding session management system, characterized in that for managing the periodic PMIP re-registration for the mobile terminal deregulated the preservation registration.

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