KR100857614B1 - Device for setting up call in packet data communication network and method thereof - Google Patents

Abstract

An apparatus for setting up a call in a packet data communication network and a method thereof are provided to reduce time required to select the IP address of a GGSN, thereby improving a success rate of a call setting connection and smoothly transmitting data. A terminal device transmits a packet data service request to an SGSN(Serving General packet radio service Support Node)(S101). When a response to the packet data service request is received to the terminal device, the terminal device transmits a PDP(Packet Data Protocol) context activation request to the SGSN(S103,S105). The SGSN searches a DB and selects the IP(Internet Protocol) address of a GGSN(Gateway General packet radio service Support Node)(S107,S109). The SGSN checks a state of the GGSN(S111). When the state of the GGSN is active, the SGSN transmits a PDP context generation request to the selected IP address of the GGSN(S115). The SGSN checks the reception of a PDP context generation response and converts the state of the GGSN into an inactive state(S121,S123). The SGSN transmits a PDP context activation response to the terminal device(S125).

Description

Device for setting up call in packet data communication network and method thereof

1 is a diagram illustrating a configuration of a packet data communication network to which call setup is applied according to an embodiment of the present invention.

2 is a block diagram showing in detail the configuration of a call setting device of a packet data communication network according to an embodiment of the present invention.

3 is a flowchart illustrating a call setup process of a packet data communication network according to an exemplary embodiment of the present invention.

4 is a flowchart illustrating in detail a call setup process of a packet data communication network according to an exemplary embodiment of the present invention.

FIG. 5 is a flowchart illustrating a method of performing state management of a packet gateway support node by a call establishment apparatus according to an embodiment of the present invention.

The present invention relates to an apparatus and method for setting up a call in a packet data communication network. More particularly, the present invention relates to an apparatus and a method for establishing a call by a packet switching support node (SGSN) in a packet data communication network to a gateway GPRS support node (GGSN).

In general, a packet data communication network includes a packet switching support node which is connected to a terminal device and processes incoming and outgoing call signals, and a packet gateway support node which is connected between a packet switching support node and the Internet to convert and process packet data. do.

When a data call connection is attempted from a terminal device, the packet switched support node obtains an IP (Internet Protocol) address of a packet gateway support node to be connected corresponding to an access point name received from the terminal device. And a packet data protocol context (PDP) context is set to allocate a packet gateway support node corresponding to the obtained IP address and a tunnel for a user session.

Here, the packet switched support node requests the PDP context setting from the packet gateway support node to complete the call connection when a response is received, and then the terminal device can receive the packet data service.

At this time, if a response is not received from the packet gateway support node, it waits for a predetermined time and retries the PDP context setting request. If the response is still not received, the IP address of another packet gateway support node is obtained and the PDP context setup procedure is performed again.

As described above, in the conventional call setup process, there is no method of determining whether the corresponding packet gateway support node can establish a call without confirming the presence or absence of a response signal from the packet gateway support node of the selected IP address.

Therefore, there is a problem that unnecessary call connection is made to the packet gateway support node that cannot set up a call, which wastes resources and increases call setup time.

It is therefore an object of the present invention to provide a call setup apparatus and method in a packet data communication network which manages state information of a packet gateway support node and performs call setup using the same.

In order to achieve the above-described problem, the call setup device according to a feature of the present invention,
In the packet data communication network including a first node performing a call processing for providing a packet service and a second node performing a packet service gateway function, the call setting apparatus of the first node, at least one of the second node A database that stores a static internet protocol address and respective state information mapped to the static internet protocol address of the second node; And a static internet protocol address of the second node in a state in which a call can be established by searching the database when the access point name obtained through the first call setup request received from the terminal apparatus is set. And a call processor for selecting a second call to the static Internet protocol address of the second node.

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Call setup method according to a feature of the invention,
In a packet data communication network including a first node performing a call processing for providing a packet service and a second node performing a packet service gateway function, the call setup method of the first node, comprising: (a) a received request from a terminal apparatus Checking whether a static internet protocol address scheme is set in an access point name acquired through the first call setup request; (b) retrieving at least one static Internet protocol address of at least one second node to which state information is mapped, if a static Internet protocol address scheme is set in the access point name; (c) selecting a static Internet protocol address of the second node whose mapped state information is available for call establishment; And (d) transmitting a second call setup request to the static Internet protocol address of the second node selected in step (c).

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DETAILED DESCRIPTION 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”, “block”, etc. described in the specification mean a unit that processes at least one function or operation, which is hardware or software or a combination of hardware and software. It can be implemented as.

An apparatus and method for establishing a call in a packet data communication network according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a packet data communication network to which call setup is applied according to an embodiment of the present invention.

According to FIG. 1, a packet data communication network includes a terminal device 100, a wireless access network 200, a packet switched support node 300, a packet gateway support node 400, and an internet network 500.

In this case, the packet data communication network uses a wideband code division multiple access (WCDMA) network. Hereinafter, each configuration will be described.

The terminal device 100 is a terminal that automatically performs a session establishment procedure and transmits and receives packet data according to a session establishment request from a packet data communication network. The terminal device 100 includes a data storage space for packet data transmission and reception. In addition, the terminal device 100 transmits and receives packet data based on a MIE (Microsoft Internet) based on HTML (Hypertext markup language) using a wireless application protocol (Wireless Application Protocol), HTTP (Hypertext transfer protocol) protocol. Packet data reception and transmission to the packet data communication network is performed using an Explorer, Handheld Device Transport Protocol, and File Transfer Protocol (FTP) functions.

Radio Access Network (200) is a base station transmitter (Radio Transceiver Subsystem) 210 that accommodates the radio access standard of the 3rd Generation Partnership Project (3GPP) standard to support the existing WCDMA and wireless It includes a network controller (Radio Network Controller) (220).

The wireless access network 200 receives a communication request signal, a data transmission request signal, and uploading data from the terminal device 100 and transmits the data to the packet switching support node 300, and receives packet data from the packet switching support node 300. Performs the function of transmitting to the terminal device (100).

The base station transmitter 210 performs a radio access termination function with a terminal device 100 according to a 3rd Generation Partnership Project radio access standard, and transmits and receives voice, video, and data traffic using a WCDMA method. It transmits and receives information with the terminal device 100 through the function and the transmission and reception antenna. In general, the internal subsystem of the base station transmitter 210 is composed of a base-station interconnection subsystem, a base band subsystem, and a radio frequency subsystem. In addition, the base station transmitter 210 may be used under the name 'Node B' in the 3rd Generation Partnership Project wireless access standard.

The radio network controller 220 includes wired and wireless channel management, protocol matching of the terminal device 100, and protocol matching of the base station. It is responsible for soft handoff processing, protocol matching with Core Network, GPRS (General Packet Radio Service) network access, fault management, and system loading.

In addition, the packet-switching support node 300 and the packet gateway support node 400 constitute a GPS network defined to provide a packet data service compatible with the Internet Protocol (hereinafter, referred to as 'IP') network. Thereby transmitting and routing packet data between the terminal device 100 and the Internet network 500.

The packet switched support node 300 (or the first node), also called a serving GPRS support node (SGSN), receives a packet sent from the terminal device 100 and transmits the packet to the packet gateway support node 400. And a packet serving node that is responsible for delivering a packet received from the packet gateway support node 400 to the terminal device 100. The packet switching support node 300 performs session management, authentication and billing functions, and packets for managing mobility of the terminal device 100, calling / incoming call processing procedures, and packet data transmission and reception for the GPS service. Has routing function of data.

The packet gateway support node 400 (or the second node) is also referred to as a gateway GPRS support node (GGSN) and transmits a packet received from the packet switched support node 300 to a packet data protocol (PDP, Packet Data). Protocol) format is transmitted to the Internet network 500. The packet gateway support node 400 determines a network providing packet data service and a connected network through an access point name (hereinafter, referred to as an 'APN'), and a gateway with the Internet network 500 (Gateway). ) Play a role. Here, the APN is a delimiter including an IP address assigned to the terminal 100 by the packet gateway support node 400, and is used as a delimiter for a specific service to distinguish servers providing packet data services.

The internet network 500 is connected to a plurality of external servers (not shown in the drawing) that provide the packet data service requested by the terminal device 100 and is connected to the terminal device 100 through the packet gateway support node 400. Connected.

Here, the terminal device 100 establishes a session by requesting packet call setting corresponding to a packet data service to be used. At this time, the terminal device 100 makes a first call setup request for establishing a session with the packet switched support node 300, and the packet switched support node 300 sets up a session with the packet gateway support node 400. The second call is set up. This process is commonly referred to as "PDP Context Request".

At this time, the first call setup request process is "PDP Context Activation" and the second call setup request process is "PDP Context Creation Request". On the other hand, since "PDP Context Request", "PDP Context Activation" and "PDP Context Creation" is well known to those skilled in the art, detailed description thereof will be omitted.

Meanwhile, the packet switched support node 300 includes a call setup apparatus that performs the first call setup request process and the second call setup request process.

The call setup device of the packet-switching support node 300 selects the requested APN information when the first call setup is requested from the terminal device 100. The IP address of the packet gateway support node 400 connected to the corresponding packet data server is obtained using the selected APN information, and the second call setup request is performed. In this case, if a failure occurs in the packet gateway support node 400 that requests the second call setup, the GPS service is impossible, and in particular, in the case of the static IP method, session establishment is impossible.

Therefore, the call establishment apparatus of the packet gateway support node 400 checks whether the static IP scheme is set by using the selected APN information, and in this case, checks the state information of the selected packet gateway support node 400 and checks whether it is normal. If it is in a state, that is, an active state, select this and request the setting of the second call.

The call establishment apparatus of the packet switched support node 300 manages the state of the packet gateway supported node 400 to narrow the range to the Internet protocol address of the normal state of the packet gateway supported node 400 at the time of the second call setup. The Internet protocol address of the packet gateway support node 400 to perform call setup is selected.

Next, the configuration of the call setup apparatus will be described in detail with reference to FIG. 2.

2 is a block diagram showing in detail the configuration of a call setting device of a packet data communication network according to an embodiment of the present invention.

According to Figure 2, the configuration of the call setting device of the packet-switching support node 300 comprises a database 310 that stores the IP address and the state information of the packet gateway support node (400 in Fig. 1) and a packet gateway capable of call setup It includes a call processing unit 320 for requesting a call setup to the IP address of the support node 400. Hereinafter, each configuration will be described.

The database 310 includes an IP address DB 312 and a status information DB 314. IP address DB 312 stores the IP address of at least one packet gateway support node 400. The state information DB 314 stores state information of the packet gateway support node 400. Here, the status information indicates the status of whether the packet gateway support node 400 is in normal operation, call setup availability, and the like.

The call processor 320 selects the APN by comparing the requested APN information with the PDP context information in the subscriber profile stored in the packet switching support node 300 according to the first call setup request received from the terminal apparatus 100. . When the static IP address allocation method is set using the selected APN information, the server checks the state information of the packet gateway support node 400 and requests the second call setting to the selected IP address.

The call processor 320 further includes an IP address selector 322, a call setup unit 324, and a state manager 326.

The IP address selector 322 searches the database 310 according to the first call setup request and selects the IP address of the packet gateway support node 400 in a state where call setup is possible.

The call setup unit 324 transmits the second call setup request to the IP address of the packet gateway support node 400 received from the IP address selector 322 and checks whether a response is received.

The state manager 326 may set an initial value of state information mapped to the IP of the packet gateway support node 400 stored in the database 310 and receive a response to the second call setup request from the selected packet gateway support node 400. Accordingly, the state information of the corresponding packet gateway support node 400 indicating whether a call can be established is updated.

Next, a method of establishing a call in a packet data communication network will be described based on the above configuration.

3 is a flowchart illustrating a call setup process of a packet data communication network according to an exemplary embodiment of the present invention.

According to FIG. 3, when a terminal apparatus (100 of FIG. 1) transmits a service request of packet data to a packet switching support node (300 of FIG. 1) (S101) and a response thereto is received (S103), a PDP context activation request is performed. Transfer (S105).

The packet switched support node 300 searches the database 310 (FIG. 2) (S107) and selects an IP address of the packet gateway support node 400 (FIG. 1) to request call setup (S109).

At this time, the state of the packet gateway support node 400 selected in step S109 is checked (S111) to determine whether it is in an activated state (S113).

If the check result of step S113 is in the activated state, the PDP context creation request is transmitted to the IP address of the packet gateway support node 400 selected in step S109 (S115).

Alternatively, if the check result of step S113 is not activated, the process returns to step S107 and steps S109, S111, and S113 are performed again.

Thereafter, the packet switched support node 300 may receive a PDP context generation response from the packet gateway support node 400 (S117) or may not receive a condition (S119).

Here, the packet-switching support node 300 checks whether the PDP context creation response is received (S121), and if it is not received, switches the state of the packet gateway support node 400 selected in step S109 to an inactive state (S123). ).

The process returns to step S107 and subsequent steps S109, S111, S113, S115, S117 or S119 are performed.

Alternatively, when receiving the PDP context creation response, the packet exchange support node 300 transmits the PDP context activation response to the terminal device 100 (S125).

Then, the terminal device 100 may be connected to the Internet network 500 of FIG. 1 through the packet switching support node 300 and the packet gateway support node 400 to receive a packet data service.

At this time, a process of performing call setup by the call setup apparatus of the packet-switching support node 300 will be described in more detail with reference to FIG. 4.

4 is a flowchart illustrating in detail a call setup process of a packet data communication network according to an exemplary embodiment of the present invention.

According to FIG. 4, when a PDP context activation request is received (S201), an APN of the requested packet data service is selected (S203). At this time, the selection may select the same APN by searching the APN provided from the terminal device (100 of FIG. 1) and the APN registered in the profile of the subscriber.

Here, it is checked whether static IP is set using the selected APN (S205). In general, the terminal device 100 checks whether the PDP context activation request uses the static address or the dynamic address and thus uses the selected information.

At this time, when the static IP is not set as a result of checking in step S205, an external domain name server is queried (S207) to obtain an IP address of the packet gateway support node (400 of FIG. 1) (S209). Here, the domain name server is not shown, but a configuration generally used in the art stores the IP address of the packet gateway support node that is bound to information according to the APN in advance.

The PDP context creation request is transmitted to the IP address obtained in step S209 (S211). When the response is received (S213), the PDP context activation response is transmitted to the terminal device 100 (S235) and the call setup procedure is completed.

On the other hand, if the static IP is set as a result of checking in step S205, the database 310 is searched to select an IP address of the packet gateway support node (S215). The selection method may be a primary / secondary method or a round robin method. In this case, the primary / secondary method is divided into the order of the primary and the secondary, and when the failure occurs in the primary order, the secondary order is applied. The round robin method uses the same order to select sequentially set IP addresses.

Next, the state of the packet gateway support node 400 selected in step S215 is checked (S217).

At this time, when the checked state is in an inactive state, the process returns to step S215 and subsequent steps are performed.

In addition, when the confirmed state is activated, the PDP context creation request is transmitted to the IP address of the selected packet gateway support node 400 (S219).

In operation S221, it is determined whether a response to the PDP context creation request transmitted in step S219 is received within a preset time.

When the response of the confirmation result of step S221 is received, the PDP context activation response is transmitted to the terminal device 100.

In addition, if the response of the confirmation result of step S221 is not received, the PDP context creation request is retransmitted.

If it is not received by checking whether or not the response to the PDP context creation request retransmitted in step S215 is changed, the state of the selected packet gateway support node 400 is changed to an inactive state, and the process returns to step S215 and the subsequent step is performed. Perform.

At this time, when a response to the retransmitted PDP context creation request is received, the PDP context activation response is transmitted to the terminal device 100 and the call setup procedure is completed.

Next, a method of managing the state of the packet gateway support node 400 will be described in detail.

FIG. 5 is a flowchart illustrating a method of performing state management of a packet gateway support node by a call setup apparatus according to an embodiment of the present invention, showing a state management method of the state manager 326 of FIG.

According to FIG. 5, the state manager 326 sets the initial state of the packet gateway support node 400 to an activated state (S301).

The state manager 324 checks whether the PDP context creation response has received unreceived information from the call setup unit 324 of FIG. 2 (S303). That is, it is checked whether or not the call setting unit 324 receives information indicating that the PDP context creation response has not been received.

When the reception result of step S303 is received, the IP address selection unit 322 of FIG. 2 changes the state of the selected packet gateway support node 400 to an inactive state and stores it in the state information DB (320 of FIG. 2) ( S305).

Then, a timer corresponding to the preset period is set (S307) to start the state monitoring mode of the packet gateway support node 400. After the timer expires (S309), the state is changed to the activated state (S311).

In addition, when the information indicating that the PDP context creation response has not been received as a result of the checking in step S303 is received, that is, when the PDP context creation response is received, the activation state is maintained (S313).

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.

As described above, according to the embodiment of the present invention, it is possible to reduce the time required during the selection process of the packet gateway support node, increase the success rate of call establishment and perform excellent data transmission.

In addition, since a call connection is attempted only to a packet gateway support node in a state where call can be established, unnecessary attempts of call connection can be prevented.

Claims (16)

In the call setting apparatus of the first node in a packet data communication network comprising a first node performing a call processing for providing a packet service and a second node performing a packet service gateway function, A database storing respective state information mapped to at least one static internet protocol address of the second node and a static internet protocol address of the second node; And If the static internet protocol address method is set in the access point name obtained through the first call setup request received from the terminal device, the database is searched for the static internet protocol address of the second node which is in a call setup state. A call processor for selecting a second call with a static internet protocol address of the second node by selecting Call setting device comprising a. The method of claim 1, The call processing unit, An internet protocol address selector configured to search the database according to the first call setup request and select an internet protocol address of the second node in a call setup state; A call setup unit for transmitting the second call setup request to the internet protocol address of the second node received from the internet protocol address selection unit and confirming whether to receive a response thereto; And A state manager that manages state information of the second node indicating whether a call can be established according to whether a response to the second call setup request confirmed by the call setup unit is received; Call setting device comprising a. The method of claim 2, The state management unit, As a result of confirming the call setup unit, when the response to the second call setup request is received, the current state information of the second node is maintained and when the response to the second call setup request is not received, Call setup device for changing the status information to call setup impossible. The method of claim 3, The state management unit, And setting a timer of a preset time when the state information of the second node is set to be impossible to set a call and changing the state information to set a call when the timer expires. The method of claim 4, wherein The internet protocol address selection unit, When the state information of the static Internet protocol address of the second node obtained by searching the database is not available for call setup or when a response to the second call setup request is not received as a result of the call setup unit checking; Call setup device for rescanning. The method of claim 5, The call setting unit, If a response to the second call setup request is not received, the call setup device retransmits the second call setup request transmission and transmits the result to the state manager and the Internet protocol address selector if the response is not received. . delete The method according to any one of claims 1 to 6, Initial information about the state of the second node is set to the call setup possible state. A call setup method of a first node in a packet data communication network comprising a first node performing a call processing for providing a packet service and a second node performing a packet service gateway function. (a) checking whether a static internet protocol address scheme is set in an access point name obtained through a first call setup request received from a terminal device; (b) retrieving at least one static Internet protocol address of at least one second node to which state information is mapped, if a static Internet protocol address scheme is set in the access point name; (c) selecting a static Internet protocol address of the second node whose mapped state information is available for call establishment; And (d) transmitting a second call setup request to the static Internet protocol address of the second node selected in step (c). Call setup method comprising a. The method of claim 9, After the step (d), Updating status information of the selected second node according to whether a response to the second call setup request is received; Call setting method further comprising a. The method of claim 10, The updating step, Checking whether a response to the second call setup request is present; Transmitting a response to the first call setup request to the terminal device when the response is received; And If the response is not received, changing the state information of the selected second node to call setup impossible and repeating steps (b), (c) and (d). Call setup method comprising a. The method of claim 11, The repeating step, If the response is not received, resend the second call setup request, and if the response is not received, change the status information to call setup impossible. The method of claim 12, And the state information changed to the call setup impossible is maintained for a time corresponding to a preset timer, and the status information is changed to the call setup possible when the timer expires. The method of claim 13, Step (c) is, Checking state information of the searched second node; Performing step (b) if the call result is not settable; And Selecting an internet protocol address of the searched second node when the call is in a state where call establishment is possible; Call setup method comprising a. delete The method according to any one of claims 9 to 14, Initial state information of the second node is set to a call setup state.

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