KR100367236B1 - A Mobile IP Registration Mechanism for UMTS/GPRS - Google Patents

Abstract

The present invention relates to a technique of applying mobile IP to a GPRS network, which is a packet-based network of UMTS, the third generation mobile communication system in Europe. The present invention relates to a mobile IP registration method of a new type of asynchronous mobile communication system that can solve an inefficient use problem.

The present invention is a technique for selectively reserving radio resources only in case of success after making a mobile IP registration request to a home agent located in an external network and receiving a mobile IP registration response. 2) To do this, the bearer setup procedure of the existing GPRS network is modified. 3) Therefore, a mobile IP registration method of an asynchronous mobile communication system is provided to change only the order of existing procedures in order to minimize the functions that need to be changed due to the modification of the existing bearer setup procedure.

Therefore, according to the present invention, in case of mobile IP registration failure of the home agent, since the wired / wireless resource of the GPRS system is not used, the traffic channel, which is a wired / wireless resource, particularly a high-cost wireless resource, can be efficiently used. In addition, since the bearer release procedure does not need to be performed, the processing power of the system can be improved.

Description

Mobile IP Registration Mechanism for UMTS / GPRS

The present invention relates to a technique for applying Mobile IP (General Protocol) to a General Packet Radio System (GPRS) network, which is a packet-based network of a universal mobile telecommunication system (UMTS), the third generation mobile communication system in Europe.

More specifically, the present invention relates to a mobile IP registration method of a new type of asynchronous mobile communication system that can improve the problem of inefficient use of wired and wireless resources in case of mobile IP registration failure with a home agent.

The prior art is the Mobile IP application procedure described in the standard document TR 23.923 of the 3rd Generation Partnership Project (3GPP), which is leading the UMTS standardization. This will be described with reference to FIGS. 1 and 2.

1 is a flowchart illustrating a registration procedure (in case of registration success) of a mobile IP according to a conventional embodiment.

1, the GPRS protocol and the IETF mobile IP protocol are combined as a whole. In addition, the mobile IP protocol defined by the IETF is not applied as it is, but is modified to be suitable for a wireless environment. The roles of the functional entities defined in FIG. 1 are as follows.

The terminal equipment (TE) 10 represents a laptop, a personal digital assistant (PDA), and the like, and the mobile terminal (MT) 20 is a terminal supporting GPRS. The Serving GPRS Support Node (SGSN) 30 serves as a regional IP switch. The gateway / external agent 40 refers to a function of combining a gateway GPRS support node (GGSN) defined in GPRS and a foreign agent (FA) defined in mobile IP. The gateway acts as a gateway to the Internet and the external agent acts as an agent to provide local mobile IP services. Finally, there is a Home Agent (HA) 50.

Next, the operation principle of each procedure shown in FIG. 1 will be described. The scenario to apply is when a mobile terminal (TE) terminal supporting mobile IP moves to a GPRS area and accesses a GPRS mobile terminal (MT) 20, requests mobile IP registration and GPRS. In the network, this is a procedure for supporting registration through signaling with the home agent 50.

First, bearer setup procedure 120 is performed. The terminal device 10 transmits an AT (AT) instruction generally used in a modem to the mobile terminal 20 using a Point to Point Protocol (PPP) protocol or the like.

In this case, the GPRS includes an APN (APN), and when requesting a mobile IP service, specifies an MIPv4FA (external agent that supports Mobile IP version 4). The mobile terminal receiving this performs the bearer setup procedure 120.

When the mobile terminal 20 sends a protocol data type (PDP) context activation request 101 to the packet switch 30, the packet switch 30 selects an appropriate gateway / external agent 40 (102). ) PDP context creation request 103 is transmitted.

The gateway / external agent 40 that has accepted this establishes a wired bearer between the two entities, forwarding the PDP context creation response 104 to the packet exchange 30. Receiving the PDP context creation request, the packet switch 30 transmits the PDP context activation response 105 to the mobile terminal 20 through the base station to establish a wired / wireless bearer of a lower layer. After this procedure, one bearer (traffic channel) is set up to the mobile terminal 20 and the gateway / external agent 40.

When one traffic channel is established, a mobile IP registration procedure between the gateway / external agent 40 and the terminal device 10 is performed through the established traffic channel. The gateway / external agent 40 sends an Agent Advertisement 106 to the terminal equipment 10, and the terminal equipment 10 requests the mobile IP registration request 107 to the gateway / external agent 40 in response. Do it.

The gateway / external agent 40 receiving the request makes a mobile IP registration request 108 to the home agent 50 located on the public Internet, registers the terminal equipment 10 and the external agent information, and registers the registration result. It is included in the IP registration response 109 and transmitted to the gateway / external agent 40.

The gateway / external agent 40 receiving the message transmits the mobile IP registration response 110 to the mobile terminal 20 to the mobile terminal 20. After this step, the mobile IP registration procedure is completed, and the home address of the corresponding terminal device 10 is determined. The gateway / external agent 40 inserts a home address into the PDP context of the terminal device 10 (111).

2 is a flowchart illustrating a registration procedure (in case of registration failure) of a mobile IP according to another exemplary embodiment.

First, the procedure from the AT command 100 procedure to the mobile IP registration response 109 is applied in the same manner as in FIG. 1 (200). However, suppose the mobile IP registration fails by the home agent 50 in the mobile IP registration response 109. Failure to register is caused by the following reasons.

* Unknown reason

* Registration is prohibited for administrative purposes

* Lack of resources

* Authentication failure of terminal equipment

* Authentication failure of external agent

* Registration ID Mismatch

* Insufficient contents of registration request message

* Too much mobility binding at the same time

* Address of unknown home agent

In the case of a mobile IP registration failure for the same reason as described above, the mobile IP registration response 109 and the gateway / external agent 40 transmitted by the home agent 50 to the gateway / external agent 40 are performed by the mobile terminal 20. The mobile IP registration response 110 transmitted to) includes a cause of registration failure. In the GPRS network, in case of mobile IP registration failure, the previously set bearer is released.

For this purpose, a bearer release procedure, that is, procedures 201 to 205 of FIG. 2 are performed. When the gateway / external agent 40 sends the PDP context deletion request 201 to the packet switcher 30, the packet switcher 30 sends the PDP context deactivation request 202 to the mobile terminal 20. In response, the mobile terminal 20 sends the PDP context deactivation acknowledgment 203 to the packet switch 30, and the packet switch 30 sends the PDP context delete response 204 back to the gateway / external agent 40. do. The mobile terminal 20 and the gateway / external agent (including the base station) 40 are released in advance.

As described above, the conventional mobile registration procedure in the GPRS network does not properly consider the case of registration failure. To describe this, the mobile IP registration procedure is as follows.

First, when mobile IP registration is requested from the terminal device 10, the GPRS network reserves radio resources of its own system. Then, the mobile agent registration request is made to the home agent 50 located in the external network. As a problem of this procedure, if the mobile IP registration fails in the home agent 50, the GPRS network performs a procedure of releasing a previously set radio resource.

This results in preempting unnecessary radio resources. In addition, since the resource release procedure must be performed separately due to the mobile IP registration failure, the processing power of the system is reduced.

Accordingly, the present invention is to solve the above problems, the present invention is to propose a mobile IP registration procedure of a new technique. The mobile IP registration procedure proposed in the present invention has a purpose to provide a mobile IP registration method of the asynchronous mobile communication system to reserve the radio resources by reflecting the mobile IP registration failure in the home agent.

As a technical concept for achieving the object of the present invention described above, the present invention provides a mobile IP registration request to a home agent located in an external network and receives a mobile IP registration response as a result. A technique for reserving radio resources. 2) To do this, the bearer setup procedure of the existing GPRS network is modified. 3) Therefore, a mobile IP registration method of an asynchronous mobile communication system is provided to change only the order of existing procedures in order to minimize the functions that need to be changed due to the modification of the existing bearer setup procedure.

1 is a flowchart illustrating a registration procedure (in case of registration success) of a mobile IP according to a conventional embodiment.

2 is a flowchart illustrating a registration procedure (in case of registration failure) of a mobile IP according to another conventional embodiment

3 is a flowchart showing the registration procedure (in case of registration success and failure) of mobile IP according to the present invention.

4 is a diagram illustrating the content of a signal message name and data traffic according to channel use in a registration procedure of a conventional mobile IP.

5 is a diagram illustrating the content of a signal message name and data traffic according to channel usage in a mobile IP registration procedure according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: terminal equipment (TE) 20: mobile terminal (MT)

30: Packet Switcher (SGSN) 40: Gateway / External Agent (GGSN / FA)

50: home agent (HA)

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the embodiment of the present invention will be described in detail.

3 is a flowchart illustrating a registration procedure (in case of registration success and failure) of a mobile IP according to the present invention.

The procedure proposed in the present invention can be equally applied to mobile IP registration success or failure. Compared to the existing procedure, three things are different.

First, in the proposed mobile IP registration procedure, the existing bearer setup procedure is applied in two. Secondly, the separate bearer release procedure shown in FIG. 2 is not performed. Third, the information elements of the PDP context creation response 104 and the PDP context activation response 105 are different. All other signaling messages function or internal information elements are the same as before.

Next, the operation principle of the mobile IP registration procedure proposed by the present invention is as follows.

The terminal device 10 transmits an AT command generally used in a modem to the mobile terminal 20 using a PPP protocol. At this time, it includes external agent name of GPRS, and specifies MIPv4FA when requesting mobile IP service. The mobile terminal 20 receives the bearer setup procedure 1 (121).

The bearer setup procedure 1 121 performs only a role of requesting bearer setup from the mobile terminal 20 to the gateway / external agent 40. That is, it does not set up an actual bearer. When the mobile terminal 20 sends the PDP context activation request 101 to the packet switch 30, the packet switch 30 selects a suitable gateway / external agent 40 (102) and generates a PDP context request 103. Send it.

At this point, the gateway / external agent 40 sends the agent broadcast 106 of the Mobile IP protocol to the terminal equipment 10 without making a PDP context creation response from the packet exchange 30. The agent broadcast 106 is conventionally transmitted on the traffic channel. However, in the present invention, the agent broadcast 106 is transmitted to the terminal device 10 through the signal channel since the traffic channel is established. Similarly, the terminal equipment 10 forwards the mobile IP registration request 107 to the gateway / external agent 40 via a signaling channel.

The gateway / external agent 40 that receives the mobile IP registration request 107 again makes a mobile IP registration request 108 to the home agent 50. The home agent 50 specifies success or failure in the mobile IP registration response 109. In case of failure, include the reason for the failure. The mobile IP registration response 109 is then transmitted to the gateway / external agent 40.

The gateway / external agent 40 that receives this analyzes the mobile IP registration response 109 received from the home agent 50 and, if the registration is successful, transmits the mobile IP registration response 110 to the mobile terminal 20. do.

In this case, since the home address of the terminal device 10 is determined, the gateway / external agent 40 inserts the home address into the PDP context of the terminal device (111). And bearer setup procedure 2 (122) is performed. The gateway / external agent 40 sends a PDP context creation response 104-1 to the packet switcher 30, and starts establishing a bearer between the two entities. Upon receiving this, the packet switch 30 transmits the PDP context activation 105-1 to the mobile terminal 20 and starts the radio bearer setup through the base station.

In performing bearer setup procedure 2, since the mobile IP registration is not completed, the home address of the terminal device 10 is not specified in the PDP context creation response 104 and the PDP context activation response 105. In the present invention, since the mobile IP registration is completed, the home address of the terminal equipment 10 is included.

The gateway / external agent 40 analyzes the mobile IP registration response 109 and if registration fails, the mobile IP 20 includes the reason for the failure in the mobile IP registration response 110 and transmits it to the mobile terminal 20. After the bearer setup procedure 2 (122) is performed, the reason for the failure is included, so the actual bearer is not set. That is, failures are included in the PDP creation response 104 and PDP context activation response 105.

Thus, the gateway / external agent 40, packet switch 30, base station, and mobile terminal 20 receive these responses to detect failure and do not establish a lower layer traffic bearer.

In order to complete the present invention, the following contents should be reflected. First, the existing mobile IP registration procedure (FIGS. 1 and 2) should be changed to the proposed mobile IP registration procedure (FIG. 3). In order to complete the proposed procedure, the state machine of the mobile terminal 20, the packet exchanger 30, and the gateway / external gateway must be changed.

That is, the PDP context activation request (101 in FIG. 3) transmitted by the mobile terminal 20 to the packet switch 30, and the PDP context generation request transmitted by the packet switch 30 to the gateway / external agent 40 (FIG. 3). 103) The previous response was immediately received, but in the present invention, since it is received after the mobile IP registration of the home agent 50 of the external network, the time for receiving the response should be longer. And after the gateway / external agent 40 transmits the mobile IP registration response to the mobile terminal 20, the bearer setup procedure should be started. Second, the use of channels according to each procedure is different, which is shown in FIGS. 4 and 5.

4 illustrates channel usage in a conventional mobile IP registration procedure. PDP context messages related to bearer setup use a signaling channel. Mobile IP related messages and mobile IP traffic use traffic channels.

However, in the proposed mobile IP registration procedure as shown in FIG. 5, channel use is different. PDP context messages related to bearer setup and mobile IP related messages use the same signaling channel. And only mobile IP traffic uses traffic channels. The reason for the change in channel usage is that traffic channel setup is performed after all mobile IP signaling procedures are performed.

As described above, by introducing the mobile IP registration method proposed in the present invention, the following effects can be obtained.

First, in the case of mobile IP registration failure of the home agent, since the wired / wireless resources of the GPRS system are not used, it is possible to efficiently use the traffic channel which is a wired / wireless resource, especially a high-cost wireless resource. In order to support one mobile IP service, radio resources between a mobile station and a base station, wired resources between a base station and a control station, wired resources between a control station and a packet switch, and wired resources between a packet switch and a gateway / external agent are required. In GPRS networks, resources are reserved through the Connection Oriented protocol, which is different from the connection less of the Internet. Since the section to which the present invention is applied is a GPRS network section, the resource is not directly used unless the resource is reserved.

Second, according to the present invention, in the case of mobile IP registration failure, it is not necessary to perform a separate bearer release procedure, thereby improving the processing capacity of the system.

Claims (4)

A mobile IP registration method for applying a mobile IP protocol to a UMTS / GPRS system, comprising a terminal device, a mobile terminal, a packet switch, a gateway / external agent, and a home agent, Determining whether to reserve the wired / wireless resource of the own system according to the result after receiving the mobile IP registration result from the home agent without reserving the wired / wireless resource in the bearer setup process; Separating one bearer establishment procedure into a bearer establishment request procedure and a bearer establishment response procedure; And inserting a mobile IP registration procedure between the separated bearer setup procedures to reflect the mobile IP registration response of the home agent. The method of claim 1, wherein the detailed process of registering the mobile IP is Receiving, by the gateway / external agent, a mobile IP registration response from a home agent, analyzing a result thereof, and analyzing a registration success or failure to provide a resource reservation determination function to the gateway / external agent; After receiving the mobile IP registration result from the home agent, determine whether to reserve the wired / wireless resource of the own system according to the result, and if the registration fails, removing the separate bearer release procedure because the resource reservation is not performed; ; The mobile IP registration method of the asynchronous mobile communication system, characterized in that for transmitting the mobile IP message through a signal channel. The method of claim 2, wherein the process of separating the bearer establishment procedure request procedure and the response procedure and inserting a mobile IP registration procedure therebetween is performed. Transmitting an agent broadcast message of a mobile IP when the gateway / external agent receives a PDP context creation request; Including a home address of a terminal device in the PDP context creation response and the PDP context activation response; The mobile IP registration method of the asynchronous mobile communication system, characterized in that further comprising the step of starting the bearer setup procedure after completing all the mobile IP registration procedure. The method of claim 2, wherein the process of separating the bearer establishment procedure request procedure and the response procedure and inserting a mobile IP registration procedure therebetween is performed. Transmitting, by the gateway / external agent, a PDP context creation response to the packet switch after the mobile IP registration response is transmitted to the mobile terminal; Including a home address of a terminal device in the PDP context creation response and the PDP context activation response; The mobile IP registration method of the asynchronous mobile communication system, characterized in that further comprising the step of starting the bearer setup procedure after completing all the mobile IP registration procedure.