KR100735888B1 - Apparatus and method for connecting mobile ip in wireless terminal - Google Patents

Abstract

A mobile IP connecting method and apparatus in a mobile terminal are provided to prevent a waste of radio resources by omitting the transmission of an unnecessary RRQ(Registration Request) message, quickly establish a session, and prevent a call interruption. A wireless unit(212) performs message and data communication with a base station. A memory(217) has a region for storing two or more identifiers of an RRQ message. A controller(211) stores a corresponding identifier whenever the RRQ message is transmitted, and when an RRP(Registration Reply) message is received from the base station, the controller(211) searches identifier of the RRQ message corresponding to the identifier of the RRP message, and when the same identifier exists, the controller(211) controls establishment of a session.

Description

APAPATUS AND METHOD FOR CONNECTING MOBILE IP IN WIRELESS TERMINAL}

1 is a signal flow diagram for obtaining an identifier from a base station by a wireless terminal using a mobile IP;

2 is a block diagram schematically illustrating an example of a block configuration of a wireless terminal using a mobile IP according to an embodiment of the present invention;

3 is a control flowchart of session establishment in a wireless terminal using a mobile IP according to an exemplary embodiment of the present invention.

The present invention relates to an apparatus and a method for accessing a network in a wireless terminal supporting mobile IP, and more particularly, to a mobile IP session in a wireless terminal supporting mobile IP. To the device.

Typically, a wireless terminal is a device that can communicate while providing convenience to a user. The wireless terminal mainly focused on the initial voice communication, but with the rapid development of technology, it has been developed in the form of providing various data services. As such, there is a method of using mobile IP as one of methods for providing various data services in a wireless communication system.

A wireless terminal using a mobile IP to perform communication using the mobile IP must establish a session with a base station (BS) and then receive the corresponding identifier by requesting an identifier (ID) from the base station. . This process will be described with reference to FIG. 1.

1 is a signal flow diagram for a wireless terminal using a mobile IP to obtain an identifier from a base station.

Referring to FIG. 1, first, the wireless terminal 100 sets a point-to-point protocol (hereinafter, referred to as 'PPP') to the base station 110 in step S101. This setting may be when the wireless terminal 100 is initially supplied with power or when the wireless terminal 100 enters the service area of the base station 110.

In this case, the wireless terminal 100 must obtain an identifier to perform mobile IP communication. Therefore, the wireless terminal 100 transmits a registration request message (hereinafter referred to as an RRQ message) to the base station 110 in step S103. In this case, when transmitting the RRQ message, the wireless terminal 100 transmits an identifier (eg, id = 1, id = 2, etc.) that can identify the RRQ message in the RRQ message. This identifier is generated by the wireless terminal 100 as a random value.

As described above, when the wireless terminal 100 transmits an RRQ message, the base station 110 transmits a registration reply message (hereinafter, referred to as an RRP message) to the wireless terminal 100 to transmit the RRQ message. ) To enable communication.

However, after the transmission of the RRQ message or the delay of the RRP message, the loss of the RRQ message or the loss of the RRP message, or the like, the wireless terminal 100 does not receive the RRP message or after a large delay occurs. Receiving may occur.

As described above, the loss of the message may be caused by the influence of the radio channel, or may be caused by a mismatch between the wireless terminal 100 transmitting the RRQ message and the base station 1110 transmitting the RRP message.

1 illustrates such an example. In step S103, the wireless terminal 100 generates an RRQ message and transmits it to the base station 110. After that, if the wireless terminal 100 does not receive the RRP message during the preset inter-message interval S109, the wireless terminal 100 receives a new identifier (for example, id = 2). It generates and transmits an RRQ message to the base station (110).

The interval between RRQ messages sets the number of times that an RRQ message can be transmitted and a time interval for the transmission interval between RRQ messages, at the request of a standard or an operator. For example, the interval S109 between the RRQ messages shown in FIG. 1 may be 1.75 seconds. As shown in the above example, when the RRP message is not received from the base station 110 until the inter-message interval of 1.75 seconds has elapsed, the wireless terminal 100 includes a new identifier (eg, id = 2) as in step S105. Send an RRQ message.

At this time, the wireless terminal 100 deletes the previous identifier (eg, id = 1) value. However, as shown in FIG. 1, for the first RRQ message transmitted at the time of step S107 after the time of the inter-message interval S109 has elapsed from the base station 110 due to the delay of the radio channel or the like. An RRP message that is a response may be sent.

In this case, since the wireless terminal 100 does not have a previous value (eg, id = 1), the wireless terminal 100 ignores the RRP message, which is a response to the first transmitted RRQ message. If this situation continues, the wireless terminal 100 cannot establish a mobile IP session. That is, it is not possible to inform the location information of the wireless terminal 100 by transmitting the RRQ message according to the preset transmission limit number of the RRQ message.

As a result, the wireless terminal 100 may not perform communication and must call or drop the call or perform a simple IP fallback. In this case, even if the worst situation is not true, when the timing sync of the RRQ message and the RRP message is not matched and a situation in which the RRQ message needs to be retransmitted occurs, there is a problem of wasting radio resources by itself.

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a mobile IP access method and apparatus in a wireless terminal that can reduce the degradation of the mobile IP connection rate of the wireless terminal using the mobile IP In providing.

Another object of the present invention is to provide a method and apparatus for facilitating session establishment in a wireless terminal using a mobile IP.

Still another object of the present invention is to provide a method and apparatus for preventing waste of radio resources in a wireless terminal using a mobile IP.

It is still another object of the present invention to provide a method and apparatus for preventing call truncation when establishing a session in a wireless terminal using a mobile IP.

Another object of the present invention is to provide a method and apparatus for reducing the number of transmissions of a message in a wireless terminal using a mobile IP.

In accordance with an aspect of the present invention, a method for establishing an identifier for session establishment in a wireless terminal using a mobile IP is provided. After establishing a point-to-point protocol, a base station requests a registration request (RRQ) message. Transmitting a new RRQ message in a predetermined time unit when a registration response message (RRP) message for the RRQ message is not received within a predetermined time; Storing an identifier for the new RRQ message, and comparing each of the identifiers corresponding to the one or more RRQ messages to be stored when an RRP message is received from the base station; Register an identifier when an RRP message identical to any one of these identifiers is received Including the process of setting up a session high.

An apparatus according to an embodiment of the present invention for achieving the above object, in the identifier setting apparatus for establishing a session in a wireless terminal using a mobile IP, a transmission and reception unit for performing a message and data communication with the base station, registration A memory having an area capable of storing two or more identifiers of a request (RRQ) message, and a corresponding identifier for each transmission of the transmitted RRQ message, and an RRQ corresponding to the identifier of the RRP message when a registration response (RRP) message is received from the base station; And a controller for searching the identifier of the message and controlling session establishment when the same identifier exists.

Hereinafter, with reference to the accompanying drawings the operating principle of the preferred embodiment according to the present invention will be described in detail. In the following description, only the parts necessary for understanding the operation according to the embodiment of the present invention will be described, it should be noted that the description of other parts will be omitted so as not to distract from the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, and the inventors are appropriate to the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

For example, the wireless terminal according to an embodiment of the present invention described below will be described using a mobile communication terminal capable of supporting mobile IP, but the present invention is not limited thereto. Accordingly, the wireless terminal according to an embodiment of the present invention is a terminal capable of communicating with a base station (BS), preferably a digital broadcasting terminal, a personal digital assistant (PDA), a smart phone. International Mobile Telecommunication 2000 (IMT-2000) terminal, Code Division Multiple Access (CDMA) terminal, Wideband Code Division Multiple Access (WCDMA) terminal, Global System for Mobile communication (GSM) terminal, Universal Mobile Telecommunication Service (UMTS) terminal, Of course, it can be applied to all information and communication devices such as cellular phones, Palmtop computers and notebooks, and multimedia devices, and applications thereof.

The present invention proposes a wireless terminal capable of supporting a mobile IP. Particularly, in the embodiment of the present invention, a method and apparatus for transmitting a Registration Request message (hereinafter, referred to as an RRQ message) transmitted from a wireless terminal to achieve a mobile IP session It is about. In the present invention, it is possible to prevent the degradation of the mobile IP connection rate and waste of radio resources in a poor network situation.

To this end, the wireless terminal according to an embodiment of the present invention stores Mobile IP session parameter values including an identifier (ID, identifier) of the corresponding RRQ message every time the RRQ message is transmitted, and delays the registration response message. By using the stored Mobile IP session parameter value when receiving a Registration Reply message (hereinafter referred to as an 'RRP message'), a mobile IP session can be formed.

First, an example of a portable terminal to which a function according to an exemplary embodiment of the present invention is applied will be described with reference to FIG. 2.

2 is a block diagram schematically illustrating an example of a block configuration of a wireless terminal supporting a mobile IP according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the wireless unit 212 converts and outputs a signal of a predetermined frequency band received from a base station through an antenna ANT to a baseband signal and outputs a data or message which is a signal to be transmitted to the base station by the wireless terminal. Is converted into a signal of a predetermined frequency band and transmitted. The signal converted into baseband by the wireless unit 212 is input to the modem 213.

The modem 213 demodulates and decodes the baseband signal received from the wireless unit 212 during a voice call or a data call, and then converts the baseband signal into an analog signal or a digital signal and outputs the analog signal. At this time, if the output signal is a voice signal, it is output to the speaker not shown in FIG. In addition, if the signal output from the modem 213 is a message according to signaling or session setting, etc., the controller 21 is inputted to the controller 21. If the message is displayed for display, the display unit 214 is processed after displaying the display unit 214. If the message is to be stored, it is input to the memory 217. Hereinafter, for convenience of description, the wireless unit 212 and the modem 213 will be collectively referred to as a 'transmitter / receiver'.

The display unit 214 provides the user with various information such as the current state of the wireless terminal, the operation mode or time information being performed under the control of the controller 211. In general, the display unit 214 is preferably configured of a liquid crystal display (hereinafter, referred to as an LCD). However, in the wireless terminal of the present invention, the display unit 214 may not necessarily be configured as an LCD. In addition, when the LCD is formed in the form of a touch screen, the display unit 214 may be included in an input means.

The key input unit 215 generally has a matrix structure in the form of a keypad, and generates a key signal input by a user and provides it to the controller 211. In addition to the key matrix structure, the key input unit 215 may be configured as a touch pad or a voice signal recognition device. The key input unit 215 may be configured for a user to input a specific signal to the controller 211. Therefore, the key input unit 215 does not necessarily have to be a keypad structure matrix structure.

The external interface unit 216 transmits / receives data by connecting to a wireless terminal and a device such as an external computer or another wireless terminal or a digital camera. The external interface 216 may use any of a wired or wireless serial communication method or a parallel communication method.

The memory 217 basically includes an area for storing control data for controlling the operation of the wireless terminal, an area for temporarily storing data generated during the control, an area for storing user data, and the like. Therefore, the memory 217 collectively refers to all media for storage, such as a read only memory (ROM), a random access memory (RAM), a hard disk drive (HDD), and an external expansion memory.

The user data stored in the memory 217 may include telephone number information, text message information, picture information, an audio file, and the like stored by the user. In addition, the memory 217 stores control information required for session establishment according to an embodiment of the present invention. In addition, the memory 217 has an area for storing the identifier of the RRQ message transmitted according to an embodiment of the present invention, the area for storing the identifier of the RRQ message may store at least two identifiers. Since a detailed description thereof will be described in the control flowchart of FIG. 3 to be described later, the detailed description thereof will be omitted.

The controller 211 performs control for communication and other additional services required for communication in the wireless terminal using the mobile IP. In addition, the control unit 211 performs the necessary control when setting up the session of the mobile IP according to an embodiment of the present invention. This control operation will be described in detail with reference to FIG. 3.

3 is a flowchart illustrating a session setup in a wireless terminal using a mobile IP according to an exemplary embodiment of the present invention. Hereinafter, a process of establishing a session in a wireless terminal using a mobile IP according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

2 and 3, first, the controller 211 maintains a standby state in step S301 and proceeds to step S303 when a specific event occurs. Here, the standby state is a state in which power is supplied to the wireless terminal to complete basic settings of the wireless terminal, and a process of searching for a base station is performed and whether an event such as a case of moving the base station during communication occurs. Say.

In this case, if the control unit 211 proceeds to step S303, it is checked whether the setting of the mobile IP is required. If the check result of the step S303 is required to set the mobile IP, the control unit 211 proceeds to step S307, otherwise proceeds to step S305 to perform the requested function and ends. At this time, since the embodiment of the present invention relates to the setting of the mobile IP, detailed description of other cases will be omitted.

Next, when the control unit 211 proceeds from step S303 to step S307, it sets the base station and the point-to-point protocol (hereinafter referred to as "PPP"). Subsequently, the controller 211 proceeds to step S309 after setting up the PPP, generates an RRQ message, and controls the modem 213 and the wireless unit 212 to transmit to the base station. In this case, the RRQ message includes an RRQ identifier (ID) value randomly generated by the controller 211. Therefore, the RRQ ID is preferably stored in the memory 217.

Then, the control unit 211 drives a timer (not shown in Fig. 2) and increments the RRQ message transmission count counter. The timer may use a method of storing the number of clocks input to the memory 217, or may configure a separate timer regardless of the inside of the controller 211 or the controller 211. The counter may also have an area for counting in the memory 217 to allow the control unit 211 to inspect it, or a separate counter.

Next, the controller 211 proceeds to step S311 to control the radio unit 212 and the modem 213 to check whether an RRP message is received from the base station. If the check result of the RRP message is received in step S311 proceeds to step S313, otherwise proceeds to step S315. Here, the method for checking whether the RRP message has been received may be confirmed by checking whether an RRP message having an identifier equal to the ID of the transmitted RRQ message is received.

Next, when the check result RRP message is received in step S311 and proceeds to step S313, the received ID value is set in the normal case, the memory may be initialized, and the subsequent session may be set.

On the other hand, if the RRP message is not received as a result of the check in step S311, the controller 211 proceeds to step S315 to check whether the timer set in step S309 has expired. Here, the timer includes a timer corresponding to the transmission time between messages as described in the related art. The currently set time interval between RRP messages is set to 1.75 seconds, for example. Therefore, the expiration of the timer checked in step S315 may be to check whether 1.75 seconds have elapsed. However, if the time is changed due to changes in system requirements or standards, the timer value is changed to another value.

Next, when the check result time in step S315 expires, the control unit 211 proceeds to step S317 to check whether the counter value is a threshold value. When the check value of the step S317 is a threshold value, the RRQ message is transmitted a limited number of times, and thus the routine must be terminated. In other words, the session cannot be set up later.

On the other hand, if the check result counter value of step S317 is not the threshold value, the controller 211 proceeds to step S319 to generate a new RRQ message. In this case, the new RRQ message includes a new identifier. That is, the controller 211 generates an identifier different from the identifier included in the RRQ message in step S309 and includes it in the RRQ message.

Then, the controller 211 proceeds to step S309 and transmits the generated RRQ message and stores a new RRQ ID. Then run the timer and increment the counter. In this case, the area storing the new RRQ ID may be located in a different area from the area in which the RRQ ID was previously stored, or the ID of the new RRQ message may be moved after moving the previous RRQ message to an area provided for storing the previous RRQ message. May be located in an area where the RRQ message was previously stored.

By performing this storage process, the following processing is possible. That is, as described in the related art, after transmitting the RRQ message having the first identifier (ID = 1), the RRR message having the second identifier (ID = 2) is not transmitted because the RRP message is not received within a preset time.

Thereafter, when receiving the RRP message corresponding to the first identifier, the controller 211 of the wireless terminal compares the identifier of the currently transmitted RRQ message with the identifier of the previously transmitted RRQ message from the received RRP message, and thus, the first. Even if the RRP message is received from either the transmitted RRQ message, the second transmitted RRQ message, or the third transmitted RRQ message, the RRP message may be received, and the subsequent process may be performed.

That is, the process performed in step S311 preferably checks not only the identifier of the RRQ message transmitted immediately before, but also the identifier of the previously transmitted RRQ message. If an RRP response to the RRQ message is received for any RRQ message, such as the first, second, or third, according to the result of the inspection, the process proceeds to step S313 to initialize the ID setting and the memory storing the RRQ ID, and then the session. Can be set. Through this process, call disconnection and radio channel resource waste can be prevented as described in the related art.

Here, the ID included in the RRQ message may be stored only as many as a preset number such as two or three. For example, other wireless terminals can generate the same identifier in the same manner and transmit the RRQ message. Therefore, the number of stored identifiers included in the RRQ message can vary depending on the number of wireless terminals of the user and the number of handovers. May be calculated experimentally.

As described above, in the detailed description of the present invention has been described with respect to specific embodiments, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

As described above, according to the method and apparatus for accessing a mobile IP in a wireless terminal proposed by the present invention, an RRP message may be received with respect to a previously transmitted RRQ message by storing an identifier thereof for a predetermined number of times after the RRQ message is transmitted. Can be. Therefore, according to the present invention, there is an advantage that can prevent the degradation of the mobile IP connection rate due to the delayed RRP message. In addition, according to the present invention, since unnecessary RRQ message transmission can be omitted, waste of radio resources can be prevented in advance, and fast session establishment and call disconnection can be prevented.

Claims (7)

In the identifier setting method for session establishment in a wireless terminal using a mobile IP, After setting the point-to-point protocol, transmitting a registration request message to a base station and storing an identifier of the registration request message; When a registration response (RRP) message for the RRQ message is not received within a predetermined time, transmitting a new RRQ message in the predetermined time unit, and storing an identifier for the transmitted new RRQ message; Comparing each identifier corresponding to the one or more stored RRQ messages when an RRP message is received from the base station; And registering the identifier and establishing a session when an RRP message identical to any one of the identifiers is received as a result of the comparison. The method of claim 1, And deleting the stored one or more identifiers when an RRP message corresponding to one of the identifiers of the stored RRQ messages is received. The method of claim 1, And storing at least two identifiers included in the RRQ message. The method of claim 1, And storing the identifier included in the RRQ message as many as less than or equal to the maximum number of transmissions of the RRQ message. In the identifier setting device for session establishment in a wireless terminal using a mobile IP, A transmitter / receiver that performs message and data communication with the base station, A memory having an area for storing more than one identifier of a registration request (RRQ) message; The control unit stores a corresponding identifier every time a transmitted RRQ message is transmitted, and retrieves an identifier of the RRQ message corresponding to the identifier of the RRP message when a registration response (RRP) message is received from a base station, and controls a session setup when the same identifier exists. Mobile IP access device in the wireless terminal. The method of claim 5, wherein the control unit Generate an identifier of the RRQ message in a preset time unit, Storing an identifier of the transmitting RRQ message in the memory and comparing each identifier of one or more previously stored RRQ messages with an identifier of the RRP message when a registration response (RRP) message is received from a base station, The mobile IP access device in the wireless terminal, if the same identifier exists, registers the identifier and controls the session setup using the same identifier. The method of claim 5, The RRQ identifier storage area of the memory stores a number less than or equal to the maximum number of transmission of the RRQ mobile IP access device in a wireless terminal.

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