Service Providing Method in Mobile Communication System

Service Providing Method in Mobile Communication System

1 is a block diagram of a packet mobile communication system;

2 is a flowchart illustrating a service providing method according to the prior art;

3 is a diagram showing the structure of a PDP context activation request message according to the prior art;

4 is a flowchart illustrating a service providing method according to the present invention;

5 is a diagram illustrating the structure of a PDP context activation request message according to the present invention.

**Explanation of symbols for major parts of the drawing**

11 : Mobile Terminal (MS) 12: Public Ground Mobile Network (PLMN)

13 : Internet network

<background-art><p>The present invention relates to a mobile communication service, and in particular, a mobile communication system suitable for improving service quality and subscriber satisfaction by lowering the rejection rate for service requests. on how to provide services.</p><p>1 is a block diagram of a general packet mobile communication system, in which a Public Land Mobile Network (hereinafter referred to as PLMN) 12 is a mobile communication packet switching center (Serving GPRS Support Node: hereinafter referred to as SGSN) (12a). ) and a packet gateway switching center (Gateway GPRS Support Node: hereinafter referred to as GGSN) (12b) including a general packet radio service back-bone network, a radio network subsystem for wireless access of subscribers (Radio Network Subsystem: hereinafter referred to as RNS) (12d), the domain name service (Domain Name Server: hereinafter referred to as DNS) having the GGSN (12b) IP address in the GPRS backbone network. - It is connected with the main network 12c interposed therebetween. </p><p>The mobile subscriber can access the Internet network (IP Network) 13 through the PLMN 12 using his/her mobile terminal (MS) 11, and a web server connected to the Internet network 13 Server) 14a, VOD (Video On Demand) 14b, e-mail server 14c, etc. can be connected to use the packet service. In order to provide each service, the servers of the Internet network (IP Network) 13 each have their own unique access point name (Access Point Name: hereinafter referred to as APN).</p><p>Next, a service providing method using the access point name usage method according to the prior art will be described.</p><p>2 is a flowchart illustrating a service providing method according to the prior art. First, a GPRS (General Packet Radio Service) service subscriber wants a service he or she wants. Selects one APN corresponding to the network and inputs it to the mobile terminal (MS) 11, and the mobile terminal (MS) 11 uses the input APN as a Packet Data Protocol Context (hereinafter referred to as PDP Context). ) included in the request message and transmitted to the SGSN 12a (S201).</p><p>The message format of the PDP Context request message is as shown in FIG. 3, and a protocol identifier (Protocol Discriminator: PD), a transaction ID (TI), a message ID (Message ID: M-ID), and a network service Access Point ID (Network Service Access Point ID: NSAPI), Logical Link Control Service Access Point Identifier (LLC SAPI), Quality of Service (QoS), APN, PDP CO (PDP) Configuration Option).</p><p>Here, it is characterized in that there is one access point name (APN) included in the PDP Context request message.</p><p>The SGSN 12a queries the DNS server 12e for one APN included in the received PDP Context request message (S202) to find out the IP address of the available GGSN 12b.</p><p>The process of finding out the IP address of the GGSN 12b is a process of determining whether an available IP address of the GGSN 12b exists (S203). 12a) is a PDP Context creation request message (Create) using the GPRS Tunneling Protocol (hereinafter referred to as GTP). PDP Context Request) to the corresponding GGSN 12b (S204) to request a connection to the IP network 13. </p><p>The GGSN 12b receives the PDP Context Creation Request message (Create PDP Context Request) to create a PDP Context, and determines whether this procedure is normally performed (S205). If the PDP Context is normally created, the GGSN 12b returns the result. to the SGSN 12a, and the SGSN 12a transmits a PDP Context activation accept message to the MS 11 (S206).</p><p>Next, when the mobile terminal (MS) 11 accepts the creation of the PDP context (S207), the packet service is started through the connection to the APN (S208).</p><p>On the other hand, if an available IP address of the GGSN 12b is not found in the process of finding out the IP address of the GGSN 12b, the SGSN 12a sends a PDP Context Accept message to the MS 11. ) to reject the creation of the PDP Context (S209).</p><p>In addition, if the PDP Context is not normally created in the GGSN 12b, the GGSN 12b informs the SGSN 12a of the result, and the SGSN 12a indicates that the PDP Context creation to the MS 11 is rejected. The notification prevents the mobile terminal (MS) 11 from receiving the desired service (S209).</p><p>In the prior art described above, since only one APN is used, the service request rejection rate is high. </p><p>That is, one APN transmitted by being included in the PDP Context activation request message. If a service request using There is a problem of this deterioration. </p></background-art><tech><p>The present invention has been devised to solve the above problems, and it is an object of the present invention to provide a service providing method in a mobile communication system that can prevent wastage of radio resources and improve service quality by reducing the service request rejection rate. There is this.</p></tech>

<p>The present invention includes the steps of receiving at least two or more Access Point Names (APNs) from a mobile terminal, and an address of a packet gateway switching center (GGSN) available from among the access point names. and selecting an access point name to be used, and providing a service to the mobile terminal using an access point corresponding to the access point name. Receiving, at a mobile communication packet switching center, a packet data protocol context activation request message comprising at least two or more access point names, and giving priority to the access point names; By using the packet data protocol context creation request message and sending the access point name forwarding domain name service server according to the above priority, the access point name with the address of the available packet gateway switch is It includes the step of connecting. Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. </p><p>The present invention uses a plurality of APNs to reduce a service request rejection rate compared to the prior art using only one APN.</p><p>As shown in FIG. 5, the structure of the Activate PDP Context Request message according to the present invention is a protocol identifier (Protocol Discriminator: PD), a transaction ID (Transaction ID: TI), and a message ID (Message ID). : M-ID), Network Service Access Point ID (NSAPI), Logical Link Control Service Access Point Identifier (LLC SAPI), Quality of Service (QoS) ), access point names (APN-1, APN-2, , APN-n), and PDP CO (PDP Configuration Option).</p><p>The number of APNs included in the PDP Context activation request message is at least two, and it is characterized in that the APNs have priority.</p><p>In general, the process of setting up the wireless Internet service is the process of finding the IP address of the GGSN 12b by inquiring the DNS server 12e for the name of the access point. Prioritize the service you want to access It can be said that the process of giving</p><p>And, as a method of giving priority to the APNs, for example, the order of transmission in the PDP Context activation request message, that is, APN-1, APN-2, ... , a method of assigning priorities in the order of APN-n, a method of assigning priorities in the reverse order, and the like.</p><p>Next, a service setting method using the access point name usage method according to the present invention will be described.</p><p>4 is a flowchart illustrating a packet service process according to the present invention. A GPRS service subscriber selects a plurality of APNs (n, n2) for a place he/she wants to access and receive a service from, and his/her mobile terminal (MS) In (11), the mobile terminal (MS) includes the plurality of APNs (APN-1, APN-2, ..., APN-n) input by the service subscriber in the PDP Context activation request message to the SGSN (12a) to (S401).</p><p>Preferably, the APNs use those supporting a similar service.</p><p>Accordingly, the SGSN 12a determines the priority of the APNs included in the PDP Context activation request message (S402).</p><p>As a method of giving priority to the APNs, for example, the order in which the PDP Context activation request message is sent, that is, APN-1, APN-2, ... , a method of assigning priorities in the order of APN-n, and a method of assigning priorities in the reverse order are used.</p><p>And, according to the given priority, APN(0), APN(1), APN(2), , set to APN(n).</p><p>Next, the IP address of the GGSN 12b is found by using the APNs one by one according to priority until an available IP of the GGSN 12b is found (S404).</p><p>The process of finding out the IP address of the GGSN (12b) is a process of determining whether there is an available IP of the GGSN (12b) by inquiring the APN (i) to the DNS server (12e). Contact (12e).</p><p>At this time, if there is no IP of the GGSN 12b, the IP address of the GGSN 12b is found using the APN having the next priority, that is, the APN 2 .</p><p>By repeating this process, an available IP address of the GGSN 12b is found.</p><p>Next, when the IP address of the GGSN 12b available for a specific APN is found, a PDP context creation request message is transmitted to the GGSN 12b to request creation of the PDP context (S405).</p><p>Then, it is checked whether the PDP Context is normally created (S406). When the PDP Context is normally created, a PDP Context activation acceptance message is transmitted to the mobile terminal (MS) 11 (S407) and the PDP Context creation is accepted by the mobile terminal. A packet service can be provided to the (MS) 11 through the connection to the specific APN (S408). </p><p>On the other hand, if the GGSN 12b rejects the normal creation of the PDP Context, the SGSN 12a returns to the step of finding an available IP address of the GGSN 12b using the next priority APN.</p><p>The process of finding the IP of the available GGSN (12b) in the above is the priority of the APN. By applying one by one in turn, the lowest priority APN, that is, APN(n), is possible. The service is rejected by transmitting a PDP Context activation rejection message to the MS) 11 (S410).</p>

<p>The service providing method in the mobile communication system of the present invention as described above has the following effects.</p><p>First, since a service subscriber uses a plurality of APNs supporting similar services when requesting a service, even if a service request using a specific APN is rejected, the service can be set using another APN, thereby reducing the service refusal rate.</p><p>Second, conventionally, when a service refusal occurs due to the use of one APN, a service request has to be made again. However, since the service refusal rate can be lowered by using a plurality of APNs, wireless and wired signaling resources can be efficiently used. In addition, it is possible to improve the efficiency of the system by reducing the load on the system.</p><p>Third, by giving different priorities when using a plurality of APNs, service access is possible according to the service priorities.</p><p>Those skilled in the art from the above description will be able to see that various changes and modifications can be made without departing from the technical spirit of the present invention.</p><p>Accordingly, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.</p>