KR20060092474A - Method for providing data service in general packet radio service system - Google Patents

Abstract

 The present invention is implemented to provide a function to determine whether to retry by analyzing the cause of the network connection failure in the terminal. To this end, the present invention transmits a PDP context request message to the network to access the network, and then the network gives a response message to the request of the terminal. If the request of the terminal is not accepted, the cause of the failure Is sent in the response message. Then, the terminal requesting access to the network analyzes the cause of failure sent from the network to determine whether the current situation is likely to succeed when the retry attempt is successful, or whether the unreachable status persists even after retry attempts. According to the user retry after a predetermined time interval (time interval) or immediately inform the user that the service connection failed. By doing so, it is possible to provide a service to prevent the waste of radio resources and to improve the quality of service.

Terminal, PDP Context Activation, GPRS

Description

Method of providing data service in JPSR mobile communication system {METHOD FOR PROVIDING DATA SERVICE IN GENERAL PACKET RADIO SERVICE SYSTEM}

1 is a block diagram of a GPRS mobile communication system according to an embodiment of the present invention;

2 is a signal flow diagram illustrating a procedure for a GPRS data call between a terminal and a network according to an embodiment of the present invention;

3 is a structural diagram showing an embodiment of a PDP context reject message format according to an embodiment of the present invention;

4 is an exemplary code value of a field indicating a reason for rejection for a packet data service request according to an embodiment of the present invention;

5 is a control flowchart for determining whether a service is connected through a PDP context rejection message according to an embodiment of the present invention.

The present invention relates to a GPRS mobile communication system, and more particularly, to a method of providing a data service in a GPRS mobile communication system that can efficiently provide a data service according to a reason for rejection of a data service request.

In general, a mobile communication system refers to a service that provides voice or data through a wireless network. In particular, as the mobile communication terminal is popularized, the network configuration of the mobile communication system requires a network configuration for transmitting voice, data, and the like more efficiently. In particular, since the amount of data transmitted increases as various services are provided, General Packet Radio Service (hereinafter referred to as 'GPRS') developed in the existing circuit-switched Global System For Mobile Communication (GSM) network according to this trend. ) Was developed. In packet data services such as GPRS, the user's primary purpose is to use conventional Internet-based applications such as file transfer of wireless PCs, sending and receiving e-mails, and browsing the Internet through the World Wide Web (WWW).

In general, GPRS is divided into a terminal part, an access part, and a core network part. Specifically, the access portion includes a base station and a base station controller, and the core network portion includes a serving GPRS support node (SGSG) and a gateway GPRS support node (GGSN). It is.

This configuration allows a user to receive a data service using his terminal. Specifically, the user can access the internet network through his terminal, and can use the packet service by accessing various packet data servers such as a web server, a video on demand, and an e-mail server connected to the internet network. have. At this time, the servers connected to the Internet network to provide each service has a unique access point name (APN).

GPRS uses APNs to activate PDP contexts. This APN is an identifier indicating the location of the packet data server to which the user wishes to connect. Thus, each of the packet data servers provides specific packet data at the request of the user. Accordingly, the APNs are used to distinguish packet data servers.

In addition, the terminal may receive a packet data service through an access to the APN. However, in the related art described above, when a service request is rejected, the service provides a success or failure result to the user through one attempt or unconditionally retransmits the PDP context activation request message.

As described above, there is a problem in that, when the service connection fails in the initial network connection, if the failure process is immediately performed, even if the network condition improves quickly, the transmission success rate decreases due to the failure without retry. In addition, if a network connection fails, retrying repeatedly until the service connection is successful, this causes radio resources to be wasted and service quality is deteriorated by lengthening the service request time. In addition, even if the network situation is not likely to improve for a long time there is a problem that unnecessary radio resources are wasted when repeated retry.

Accordingly, the present invention provides a data service providing method in a GPRS mobile communication system to analyze the cause of network connection failure and determine whether to retry, thereby preventing waste of radio resources and improving service quality.

The present invention provides a service in a general packet radio service (GPRS) mobile communication system, wherein a terminal transmits an active PDP context activation request message (Active PDP Context Request) that initiates a GPRS data call when a data service is requested. Determining whether an active PDP context activation rejection message is received from the network in response to the transmission; analyzing the received message by the terminal when the rejection message is received; And determining whether to retry the service connection according to the analysis result.

According to another aspect of the present invention, there is provided a data service providing method in a mobile communication terminal, the method comprising: transmitting a PDP context activation message for network access, and receiving a response message corresponding to the transmission, wherein the received response message is a PDP context; Determining whether the message is an activation rejection message; determining whether there is a code value indicating a reason for the rejection of the data service request in a predetermined field in the message; In the case of a code value indicating that the service value is a code value, a process of retrying a service connection is performed after a predetermined time interval.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same reference numerals wherever possible. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention is implemented to provide a function to determine whether to retry by analyzing the cause of the network connection failure in the terminal. To this end, the present invention transmits a PDP context request message to the network to access the network, and then the network gives a response message to the request of the terminal. If the request of the terminal is not accepted, the cause of the failure Is sent in the response message. Then, the terminal requesting access to the network analyzes the cause of failure sent from the network to determine whether the current situation is likely to succeed when the retry attempt is successful, or whether the unreachable status persists even after retry attempts. According to the user retry after a predetermined time interval (time interval) or immediately inform the user that the service connection failed. By doing so, the user can analyze the cause of the failure of the network connection when using the data service through the terminal and determine whether to retry, thereby preventing the waste of radio resources and improving the quality of the service. .

Hereinafter, the components and operations of the GPRS mobile communication system in which such a function is implemented will be described. To this end, a configuration diagram of a GPRS mobile communication system according to an exemplary embodiment of the present invention will be described with reference to FIG. 1.

As illustrated in FIG. 1, a GPRS mobile communication system may provide a mobile station (MS) 10 capable of providing a data service, deliver wireless signals and traffic to a network, or transmit data of the network to a terminal ( 10) A base station (RNC: Radio Network Controller) 20 for transmitting, serving to transmit signals and traffic between the base station 20 and the gateway GPRS Support Node (40) to the node that supports the data service It includes components such as a Serving GPRS Support Node 30 and a Gateway GPRS Support Node 40 serving as a gateway to the Internet 50.

Such a GPRS mobile communication system performs packet data processing through a PDP Context Activation process. During the PDP context activation process, a procedure required for PDP context activation, such as proper user authentication, APN (Access Point Name) value, and IP address (Internet Protocol Address) assignment, is performed.

In more detail, the terminal 10 is connected to a plurality of base stations 20, and the base station 20 is connected to a core network including a plurality of SGSNs 30 and a plurality of GGSNs 40. The core network is connected to an Internet server 50 that provides a specific packet data service through the Internet. Accordingly, in order to transmit and receive packet data, the terminal 10 needs to activate a PDP context between the GGSNs 40. Here, PDP context activation, packet call setup, and tunnel generation have the same meaning. Therefore, in order for the terminal 10 to perform packet data communication with the Internet server 50 providing a specific packet data service in response to a packet data service request from the user, the PDP contact must be activated.

In the following description, a procedure of performing a GPRS data call process between a terminal and a network according to the present invention will be described. To this end, a signal flow diagram illustrating a procedure for a GPRS data call between a terminal and a network according to an embodiment of the present invention will be described with reference to FIG. 2. Here, the call process is a process of processing packet data as a PDP context activation process.

 Hereinafter, a data service providing method using APN will be described. First, a user selects an APN corresponding to a desired service and inputs the same to the terminal. The terminal 10 inputs the APN input in step 300 to a packet data protocol (PDP) context. Included in the request message and sent to the SGSN (30). At this time, as in step 310, security functions such as an authentication procedure and an encryption procedure between the terminal 10 and the SGSN 30 are performed, and when such a procedure is completed, normal data transmission processes are performed thereafter. Is done.

Accordingly, the SGSN 30 queries the APN included in the received message to a Domain Name Server (DNS) server to find out the available IP address of the GGSN. Here, the process of determining the IP of the GGSN is a process of determining whether there is an available IP address of the GGSN. If there is an available address, the SGSN 30 generates a PDP context request message at step 320. PDP Context Request) is transmitted to the corresponding GGSN 40 to request connection with the IP.

Then, the GGSN 40 generates the PDP context by receiving the PDP context creation request message. In this case, if the PDP context is generated normally by determining whether this procedure is normally performed, the GGSN 40 notifies the SGSN 30 of the result using the PDP context creation response message (Create PDP Context Response). The SGSN 30 then sends an PDP context activation accept message (Activate PDP Context Accept) to the terminal 10. By doing so, the terminal starts the packet service through the APN.

However, according to the present invention, in the process of determining the IP address of the GGSN, a situation of rejection of the data service request may occur, such as not finding an available IP address or a failure of the GGSN. Accordingly, when a rejection situation for the data service request occurs, the SGSN 30 sends a PDP context activation rejection message to the terminal 10 to reject creation of the PDP context. In detail, when the PGS context is not normally generated, the GGSN 40 notifies the SGSN 30 of the result through the PDP context creation response message as in step 330. Accordingly, in operation 340, the SGSN 30 includes the reason for rejection according to the rejection situation for the data service request in the PDP context activation rejection message and transmits the message. In this way, the SGSN 30 notifies the terminal 10 that the generation of the PDP context has been rejected. By doing so, the terminal 10 does not receive the desired service.

However, in the terminal to which the present invention is applied, a function of determining whether to retry is analyzed by analyzing a received PDP context activation rejection message even if a desired service is not provided due to a failed network connection attempt.

Accordingly, the terminal determines whether the service connection is possible when the current rejection situation is retryed or whether the service connection is continuously impossible even if the retry is attempted according to the rejection reason included in the received PDP context activation rejection message. It will be judged. According to the determination result, the terminal retries after a suitable time interval for each rejection reason included in the PDP context activation rejection message or immediately stops the service connection.

In other words, when a rejection situation for a data service request occurs, the terminal analyzes the cause of the failure of the network connection through the received message and determines whether to retry, thereby preventing waste of radio resources and improving service quality. .

Next, reference will be made to FIGS. 3 and 4 to describe in detail a specific example to which the present invention is applied. 3 is a structural diagram illustrating an implementation of a PDP context reject message format according to an embodiment of the present invention, and FIG. 4 is a code value example of a field indicating a reason for rejection of a packet data service request according to an embodiment of the present invention. It is also.

First, the format of the PDP context rejection message is shown in FIG. 3. Referring to FIG. 3, the format of the PDP context rejection message may include a protocol discriminator (PD) 400, a transaction ID 410, and a message ID indicating that the PDP context rejection message is a message ID. M-ID) 420, an SM-cause 430 indicating a cause of service failure, and a PDP Configuration Options (PDP CO) 440.

Here, according to the present invention, the PDP context rejection message includes a cause of service connection failure. In particular, in an embodiment of the present invention, the cause of failure may be set in the SM-cause 430 field of the message format. In detail, the SM-cause 430 field to which the present invention is applied is a field indicating a substantial rejection reason for failing network access when requesting data service. The SM-cause 430 field is assigned a unique code value according to the reason for rejection of the data service request. For example, each code value as shown in FIG. 4 is set with different reasons for denial of service.

Therefore, upon receiving the PDP context activation rejection message, the terminal analyzes the received message and analyzes whether a predetermined code value is recorded in two bytes of the SM-cause 430 field region in the analyzed message. Then, the terminal resends the PDP context activation request message or suspends the service connection operation according to the analysis result.

Hereinafter, a control flow for determining whether to retry the service connection upon receiving the PDP context activation rejection message configured as described above will be described with reference to FIG. 5. 5 is a control flowchart for determining whether to connect a service through a PDP context rejection message according to an embodiment of the present invention.

First, in step 500, the terminal determines whether there is a network access request according to a specific data service use request from a user. If there is a network access request, the terminal proceeds to step 510 and sends a PDP context activation request message (Active PDP Context Request) to initiate a PDP context activation (GPRS Data Call) to the network. Then, after receiving the PDP context activation request message from the terminal, the network sends a PDP context activation permission message that allows the PDP context activation only to perform a PDP context activation by performing Security Functions. Send to the terminal. However, when a denial of service situation occurs due to various obstacles, the network transmits a PDP context activation rejection message (Active PDP Context Reject) to the terminal, which refuses to activate the PDP context.

In this case, the PDP context activation rejection message transmitted to the terminal includes, for example, network failure, Missing or unknown APN, Activation rejected by GGSN, etc. The reason for rejection according to the current rejection situation is included.

Accordingly, in step 520, the terminal determines whether a PDP context activation rejection message is received from the network in response to the transmission of the PDP context activation request message. If it is determined that the PDP context activation rejection message is received, the terminal proceeds to step 530 and analyzes the cause of the network connection failure using the received message. In more detail, the terminal analyzes the code value set in the SM-cause 430 field in the format of the PDP context activation rejection message. Then, the terminal can determine whether to retry the service connection through the analyzed code value.

Accordingly, the terminal proceeds to step 540 and determines whether the network situation in which the current rejection occurs is a service connection retry through the analyzed code value. If it is determined that the service connection retry is possible, for example, it is possible to predict that the network situation will be immediately improved if the reason for rejection such as a temporary network failure is simple, the terminal proceeds to step 550 to reconnect the network after a predetermined interval. Perform the process of retrying. Here, according to an embodiment of the present invention, the terminal may notify the user that the network connection is being attempted again. On the other hand, if the service connection retry is not possible in step 540, for example, if the network situation is not likely to improve for a long time, the service connection is immediately stopped so as not to retry repeatedly until the network connection is successful. Notify the user of a connection failure, such as This allows the user to avoid waiting indefinitely for a connection to the data service.

As described above, according to the present invention, when network access is temporarily worsened, it is possible to analyze the cause of failure and determine whether to retry, thereby efficiently using radio resources and increasing success rate of data transmission and reception.

According to the present invention as described above, when the initial network connection fails, by determining whether to retry the service connection according to the failure cause included in the message carried from the network, it is possible to prevent the waste of radio resources and to continuously There is no need to repeat the retry, reducing the load on the system and improving its efficiency.

Claims (11)

A method of providing data service in a general packet radio service (GPRS) mobile communication system, Transmitting, by the terminal, a PDP context activation request message (Active PDP Context Request) to the network when a data service request is made; Determining whether an active PDP context activation rejection message is received from the network in response to the transmission; Analyzing the received message by the terminal when the reject message is received; And determining whether to retry a service connection according to the analysis result. The method of claim 1, Receiving, by the network, a PDP context activation request message sent from the terminal; Performing a PDP context activation in response to receiving the message; And transmitting a PDP Context Activation Rejection message (Active PDP Context Reject) to the terminal when the network refuses to activate the PDP context. The method of claim 1, wherein the analyzing of the received message by the terminal comprises: And analyzing whether a predetermined code value exists in a predetermined field of the message according to a reason for rejection of a data service request. The method of claim 3, wherein The PDP context activation rejection message (Active PDP Context Reject) format may include a Protocol Discriminator (PD) field, a Transaction ID field, and a Message ID (M-ID) indicating a PDP context rejection message. ) Field, SM-cause field indicating the cause of service failure, and PDP Configuration Options (PDP CO) field. The method of claim 4, wherein the SM-cause field is A method in which a unique code value is set according to a reason for refusal of failing a network connection when a data service request is made. The method of claim 1, wherein the determining of whether to retry a service connection is performed according to the analysis result. And retrying a network access after a predetermined time interval when the current network situation is a state where service connection retries are possible. The method of claim 6, And stopping the service connection immediately if there is a possibility that the network situation is not improved for a long time as a result of the analysis. The method of claim 7, wherein And notifying the user of the service connection failure according to the data service request. A data service providing method in a mobile communication terminal, Transmitting a PDP context activation message for network access; When the response message corresponding to the transmission is received, determining whether the received response message is a PDP context activation rejection message; In the case of the rejection message, determining whether a predetermined value in the message includes a code value indicating a reason for the rejection of the data service request; And retrying the service connection after a predetermined time interval when the code value is a code value indicating that the current network condition is retryable. The method of claim 9,  Stopping the service connection if the code value is a code value indicating that the current network condition is not retryable. The method of claim 10, And notifying the user of the service connection failure according to the data service request when the service connection is stopped.

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