KR100628298B1 - Method of session recovery in gateway system and gateway system therefor - Google Patents

Abstract

Disclosed are a session recovery method in a gateway system and a gateway system for the same. Session recovery method according to the present invention, the operation management device for managing the overall operation and management of the system and the current state for the user session, the control board for protocol signal management and path management of the transmission data, and the transmission of the user data Generating a session identification value in the operation management apparatus, the gateway system including a data board in charge; Generating session management information using the session identification value in each of the components; And when the session management information is deleted due to a failure in one of the components, receiving the session management information from the components in which the failure does not occur and regenerating the session management information thereof. By distributing and storing session management information between system components, it is possible to recover from failures without using complex configuration and costly duplication. This enables developers to develop lower cost systems, while service providers can reduce the cost and ease maintenance and maintenance.

Description

Method of session recovery in gateway system and a gateway system for the same {Method of session recovery in gateway system and gateway system therefor}

1 is a conceptual diagram of a GPRS network, which is a core network of IMT-2000.

2 is a table illustrating a message that SGSN sends to GGSN for session establishment request.

3 is a block diagram illustrating an embodiment of a GGSN system according to the present invention.

4 is a diagram illustrating an embodiment of an identification value for a new session created by an operation management apparatus.

5 is a diagram illustrating an embodiment of session management information generated in an operation management apparatus by using a session identification value.

FIG. 6 is a diagram illustrating an embodiment of session management information generated by a GTP control board using a session identification value received from an operation management apparatus.

FIG. 7 is a diagram illustrating an embodiment of session management information generated by using a session identification value received from an operation management apparatus in a GTP data board.

FIG. 8 is a diagram illustrating an embodiment of a process of obtaining necessary information from an operation management apparatus for session recovery for service maintenance when session management information is deleted due to a failure in a GTP control board.

FIG. 9 is a diagram illustrating an embodiment of a process of obtaining necessary information from a GTP control board and GTP data boards for session recovery for service maintenance when session management information due to a failure is deleted in the operation management apparatus.

The present invention relates to the communication of data, and more particularly to session recovery in gateway systems.

In the asynchronous IMT packet network, Gateway GPRS Support Node (GGSN) equipment is used to perform the wired / wireless Internet matching gateway.

General Packet Radio Service (GPRS), one of the packet-based wireless communication services, ensures mobile and computer users continuous Internet access at data rates of 56kbps to 114kbps. GPRS's high-speed data transmission allows users to participate in video conferencing and to communicate with multimedia websites and other devices using laptops as well as portable devices. GPRS is based on GSM (Global System for Mobile communication) communications, and complements existing services such as circuit-switched mobile phones and short text services.

GPRS, a packet-based service, has less loss than a circuit-switched service that is assigned to only one user at a time, because it uses a communication channel to share packets only when needed. GPRS also makes it easier to create tasks for mobile users because of the faster data rates, they no longer need the middleware needed to adapt their work to slower wireless systems. Using GPRS, mobile users of virtual private networks (VPNs) can continue to access their private networks without dial-up connections.

In service operation, data including session information stored in memory may be lost due to electric shock, operating system (OS) defect, program or user error, etc. The system has a method of recovering lost session information by providing a double memory or a duplicated link. During normal operation, one module is used and the same information is updated at the same time in the spare module. If the module in use fails, the standby module in standby is activated and operated. This allowed us to continue supporting services such as session setup and teardown and data transfer without disruption. However, in the conventional method, since hardware has to be duplexed, an additional cost is required, and the overhead of the duplication of updating information is increased, thereby causing a burden of maintenance and maintenance costs to developers and service providers.

The technical problem to be achieved by the present invention is to provide a session recovery method in a gateway system that does not require additional overhead and cost burden.

Another technical problem to be achieved by the present invention is to provide a gateway system supporting such a session recovery method.

According to the present invention, the operation management device for managing the overall operation and management of the system and the current state of the user session, the control board for protocol signal management and path management of the transmission data, and the transmission of the user data according to the present invention A session recovery method in a gateway system including a data board in charge, the method comprising: generating a session identification value in the operation management device; Generating session management information in each of the components using the session identification value; And when the session management information is deleted due to a failure in one of the components, receiving session management information from the non-failing components and regenerating their session management information. .

On the other hand, according to another field of the present invention, the other technical problem, the operation management device for managing the overall operation and management of the system and the current state for the user session, the control board for protocol signal management and path management of transmission data And a data board for transmitting user data as a component, wherein each of the components generates session management information by using an identification value of a user session generated by the operation management apparatus. Management information generation unit; And a management information regeneration unit configured to receive session management information from components that do not have a failure and regenerate their session management information when the session management information is deleted due to a failure.

Hereinafter, a session recovery method in a gateway system according to the present invention and a preferred embodiment of a gateway system for the same will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram of a GPRS network, which is a core network of IMT-2000.

Referring to Figure 1, GPRS network conforms to the general specification of the network structure.

GPRS network is divided into wireless section and wired section. The wireless section capable of guaranteeing free space movement of the MS (Mobile Station, 101) includes a Node B (102) and a Radio Network Controller (RNC).

The GPRS internal network, which is a wired section, includes a Home Location Register (HLR) 104, a Serving GPRS Support Node (SGSN) 105, and a Gateway GPRS Support Node (GGSN) 106. HLR 104 manages location information for subscribers and has interfaces with SGSNs and GGSNs. SGSN 105 selects a particular GGSN among a plurality of GGSNs and serves as an exchange. The GGSN 106 serves as a gateway of an external packet data network (PDN).

In addition, to provide additional services, the AAA server includes an Authentication, Authorization, and Accounting (AAA) server 107, a Dynamic Host Configuration Protocol (DHCP) server 108, a Home Agent (HA) server 109, and the like. The AAA server 107 performs authentication, authorization and charging of the service subscriber. DHCP server 108 provides the provider's dynamic IP in addition to the static IP for packet services. The HA server 109 provides a mobile IP service to guarantee the mobility of the subscriber.

Due to the interaction of the network nodes, the MS 101 as a service subscriber can access various Internet servers 110 connected to the external network. The techniques presented in the present invention relate to the interworking between the SGSN 105 and the GGSN 106 and the internal operation of the GGSN 106, and other technical matters are in accordance with the general standard of the respective configuration nodes.

FIG. 2 is a table illustrating a message (Create PDP Context Request) transmitted by the SGSN 105 to the GGSN 106 for a session establishment request. Referring to FIG. 2, there is shown a list of information elements following a GTP (GSM Tunneling Protocol) header as the content of a session establishment request message. The GGSN 106 constructs session information for service provisioning based on these information elements received from the SGSN 105. Looking at the components necessary for data transmission of these information elements, IMSI (201) indicating the user number of the user terminal, Tunnel Endpoint Identifier (TEID) Data I 202 and TEID Control for the control and data access point of the GTP session Plane 203, NSAPI 204 for distinguishing two or more sessions for one user, APN (Access Point Name) for identifying general network domain with logical name indicating GGSN 206, the control node address 207 of the SGSN, and the data node address 208.

3 is a block diagram illustrating one embodiment of a GGSN system 300 in accordance with the present invention.

Referring to FIG. 3, the GGSN system according to the present invention preferably includes an operation management apparatus 310, a GTP control board 320, and GTP data boards 331 to 33n.

The operation management device 310 manages the operation and management of the entire gateway system, that is, the GGSN system, and the current state of the user session. The operation management unit manages a number of GTP control boards and GTP data boards, and is connected to them by Ethernet.

The GTP control board 320 is responsible for signaling and path management of the GTP protocol. The GTP data boards 331 to 33n are responsible for the transmission of user data. The GTP control board 320 and the GTP data boards 331 to 33n are related to each other at a ratio of 1 to n, and the operation management device 310 is responsible for configuration management therebetween.

The GTP control board 320 plays a role as a counterpart node of the GGSN for signaling of the SGSN 105, and the GTP data boards 331 to 33n play a role as a node for data transmission. When the initial session request is sent from the SGSN 105, signaling arrives at the GTP control board 320 in the GGSN system 300, and the GTP control board 320 performs basic operations for verifying the GTP protocol with the received message. After the transfer to the operation management device (310). The operation management apparatus 310 generates an identification value for the new session after checking the session establishment request message sent from the GTP control board 320.

4 is a diagram illustrating an embodiment of an identification value for a new session created by an operation management apparatus. Referring to FIG. 4, the session identification value 400 preferably includes a control board ID 410, a data board ID 420, and a predetermined serial number 430. The session identification value 400 according to the embodiment of FIG. 4 has a total length of 4 bytes.

The operation management device 310 selects a specific GTP data board according to a resource allocation policy according to a limited resource and load of the GGSN system among a plurality of GTP data boards supporting the APN (Access Point Name) requested by the SGSN 105. The second field of the session identification 400 contains the ID of the GTP data board thus selected.

The third field, serial number 430, is assigned a new value that does not overlap with the previously selected value.

Session identification is generated for all sessions currently in progress. Since the session identification value generated in this process has a unique value in any component in the GGSN system, it can be managed as a common session identification value.

The session identification value 400 generated as described above is transmitted to the GTP control board 320 and the corresponding GTP data board in an internal signal.

The operation management apparatus 310 generates session management information using the session identification value generated by the operation management apparatus 310.

The GTP control board 320 and the corresponding GTP data board generate session management information required by using session identification values received from the operation management apparatus.

FIG. 5 is a diagram illustrating an embodiment of session management information generated by the operation management apparatus 310 using the session identification value. Referring to FIG. 5, the session management information 500 generated by the operation management apparatus may include a session identification value 501, state information 502 for a current session, and information 503 to control performed by the GTP control board. 505, IMSI 506, NSAPI 507, Qos 508, information 509-511, TFT 512, and APN 513 related to data processing performed in the GTP data board. desirable. IMSI 506, NSAPI 507, Qos 508, TFT 512, and APN 513 are information needed for session maintenance.

FIG. 6 is a diagram illustrating an embodiment of session management information generated by the GTP control board 320 using a session identification value received from the operation management apparatus.

Since the GTP control board performs only a unique function for signaling, it is related to the information forming the control plane of the GTP session. Accordingly, the session management information 600 generated by the GTP control board 320 may include the session identification value 601, the TEID 602 of the SGSN control plane, the TEID 603 of the GGSN control plane, and the address 604 of the SGSN control plane. It is preferable to include). The information 602 to 604 constituting the control plane of the GTP session is the same as the information about the controls 503 to 505 performed in the GTP control board shown in FIG. 5.

FIG. 7 is a diagram illustrating an embodiment of session management information generated by using the session identification value received from the operation management apparatus in the GTP data boards 331 to 33n.

Since the GTP data board only performs its own functions for data transfer, it is related to the information that forms the data plane of the GTP session. Therefore, the session management information 700 generated by the GTP data boards 331 to 33n includes the session identification value 701, the TEID 702 of the SGSN data plane, the TEID 703 of the GGSN data plane, and the address of the SGSN data plane. It is preferable to include 704. The information 702-704 constituting the data plane of the GTP session is the same as the information 509-511 regarding the data processing performed in the GTP data board shown in FIG. 5.

8 is a diagram illustrating an embodiment of a process of obtaining necessary information from the operation management apparatus 310 for session recovery for service maintenance when the session management information is deleted due to a failure in the GTP control board.

Referring to FIG. 8, the GTP control board 320 requests 820 to transmit necessary information to the operation management apparatus 310 for session recovery. The operation management device 310 searches for the control board ID 410 of the session identification value for all currently held sessions by referring to the ID of the requested GTP control board and corresponds to the corresponding GTP control board. Find session management information (830). The operation management apparatus sends information 503 to 505 related to the control plane performed by the GTP control board, from the session management information to the GTP control board 320 (840). The GTP control board 320 having received the session information list regenerates the session management information based on the information received from the operation management apparatus.

In FIG. 8, only the case of the failure recovery in the GTP control board is illustrated, but it can be easily seen that the failure recovery in the GTP data board is performed in the same manner through the corresponding process.

FIG. 9 illustrates an embodiment of a process of obtaining necessary information from a GTP control board and GTP data boards for session recovery for service maintenance when the session management information due to a failure is deleted in the operation management apparatus 310. Drawing.

In order to regenerate the session management information 500 in the operation management apparatus 310, all of the information included in the session management information 600 used by the GTP control board and the session management information 700 used by the GTP data board are required. do. Therefore, in operation 920, the operation management apparatus 310 requests the session recovery information to be sent to both the GTP control board and the GTP data board for session recovery. In response to the request, the GTP control board and the GTP data board transmit session management information to the operation management apparatus 310 (930). The operation management apparatus 310 regenerates its own session management information by combining the received control board session management information 600 and the data board session management information 700.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to a method for recovering a session in a gateway system and a gateway system for the same, a method for recovering a failure without using a duplication scheme requiring complex configuration and high cost by distributing and storing session management information between system components is provided. You can do that. This enables developers to develop lower cost systems, while service providers can reduce the cost and ease maintenance and maintenance.

Claims (13)

Operation management device that manages the overall operation and management of the system and the current state of the user session, control board for protocol signal management and path management of transmission data, and data board for transmission of user data as components In the session recovery method in the gateway system, Generating a session identification value in the operation management device; Generating session management information in each of the components using the session identification value; And If the session management information is deleted due to a failure in one of the components, receiving session management information from the non-failing components and regenerating their own session management information. The method of claim 1, wherein the session identification value, An identification value of the control board; An identification value of the databoard; And And a predetermined serial number. The session management information generated by the operation management device, The session identification value; Information about control performed on the control board; And And information about data processing performed on the databoard. The session management information generated by the control board, The session identification value; And And control information performed on the control board. The session management information generated by the databoard is: The session identification value; And And information about data processing performed on the databoard. The method of claim 1, wherein regenerating the session management information of the session management information in the operation management apparatus comprises: Receiving control board session management information including information about control performed in the control board from the control board; Receiving data board session management information including information about data processing performed on the data board from the data board; And And regenerating session management information of the operation management device by combining the control board session management information and the data board session management information. The method of claim 1, wherein regenerating session management information from the control board comprises: Receiving session management information of the operation management device including information on the control performed by the control board from the operation management device; And And regenerating session management information of the control board by extracting information about the control performed in the control board from session management information of the operation management device. The method of claim 1, wherein regenerating session management information from the databoard comprises: Receiving session management information of the operation management device including information on data processing performed on the data board from the operation management device; And And regenerating session management information of the data board by extracting information on data processing performed on the data board from session management information of the operation management device. Operation management device that manages the overall operation and management of the system and the current state of the user session, control board for protocol signal management and path management of transmission data, and data board for transmission of user data as components In the gateway system, Each of the components, A management information generation unit generating session management information by using the identification value of the user session generated by the operation management device; And And when the session management information is deleted due to a failure, the management information regeneration unit for receiving session management information from components that do not have a failure and regenerating their own session management information. The method of claim 9, wherein the session identification value, An identification value of the control board; An identification value of the databoard; And Gateway system comprising a predetermined serial number. The method of claim 9, wherein the session management information generated by the operation management device, The session identification value; Information about control performed on the control board; And Gateway system, characterized in that it comprises information about the data processing performed in the data board. 10. The method of claim 9, wherein the session management information generated by the control board, The session identification value; And Gateway system, characterized in that it comprises information about the control performed in the control board. 10. The method of claim 9, wherein the session management information generated from the databoard, The session identification value; And Gateway system, characterized in that it comprises information about the data processing performed in the data board.

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