KR100437145B1 - Method and system for PDSN duplexing in wireless packet data network - Google Patents

Abstract

The present invention provides a wireless packet data network in which at least two packet processing apparatuses are grouped and a packet processing apparatus of a failed packet processing apparatus is continuously performed in a grouped counter packet processing apparatus when a random packet processing apparatus fails. The present invention relates to a duplexing method of a packet processing apparatus and a system thereof.

In addition, the method and system for redundancy of a packet processing apparatus in a wireless packet data network according to the present invention, the communication with the wireless terminal and the IP network using a common IP, and the call processing and path control between the wireless terminal and the IP network In a wireless packet data network including a plurality of packet processing apparatuses for processing various packet data for each other, at least two or more packet processing apparatuses are set as one group, and each packet processing apparatus grouped in a normal state has its own The session information, which is call processing information, is sent to the counterpart packet processing apparatus to have the same session information. When a failure occurs in the first packet processing apparatus, the first packet processing is performed by the first packet processing apparatus and the second packet processing apparatus grouped together. By registering the public IP of the device, based on the session information provided from the first packet processing device before failure, It characterized in that the emitter so as to perform the process on and on.

Description

Redundancy method and system for packet processing apparatus in wireless packet data network {Method and system for PDSN duplexing in wireless packet data network}

The present invention relates to a duplexing method and a system of a packet processing apparatus in a wireless packet data network. In particular, when at least two packet processing apparatuses are grouped and an arbitrary packet processing apparatus fails, a packet that has failed in a counterpart packet processing apparatus. The present invention relates to a method and system for duplexing a packet processing apparatus in a wireless packet data network configured to continuously perform a packet processing operation of the processing apparatus.

In general, wireless data communication passes through the first generation stage using a wireless data communication network or a cellular modem, and now implements a second generation stage of wireless data communication service using a voice / data combination using a digital cellular / PCS network. Doing.

In addition, recently developed third generation wireless data communication networks have been developed to add a mobile IP concept so that subscribers can receive packet services such as Internet services while moving. Since the third generation wireless data communication network performs a packet data service through a wireless network, it is called a wireless packet data network. The wireless packet data network is currently being developed as a CDMA2000 and UMTS system.

1 is a diagram schematically showing a configuration of a general wireless packet data network.

As shown in FIG. 1, a wireless packet data network includes a wireless terminal 1 for a service subscriber to receive a packet data service such as a wireless Internet service, and a base station that performs data transmission and reception wirelessly with the wireless terminal 1 ( 2) a base station controller 3 for controlling the operation of the base station 2 and a packet data service request coupled from the base station controller 3 and the IP network 5 and applied from the base station controller 3 based on the request. It includes a packet processing apparatus for performing an overall call processing function between the wireless terminal 1 and the IP network 5, and thus packet data service, that is, a packet data service node (PDSN: 4). In this case, the PDSN 4 is combined with the base station controller 3 and the IP network 5 through a LAN, and the information is transmitted and received in the form of a packet.

That is, when the service subscriber selects a connection to an arbitrary destination, for example, a service providing server, connected to the IP network 5 through the wireless terminal 1, the corresponding destination information is transmitted to the base station 2 and the base station controller 3; It is sent to the PDSN (4) through, the PDSN (4) performs a series of call processing procedures such as searching for the IP information corresponding to the destination information, assigning an effective IP to the radio terminal (1).

In addition, PDSN (4) stores the session information consisting of the wireless terminal information and destination information currently being processed call and the communication path information between the wireless terminal and the destination and the packet data between the wireless terminal device and the destination being processed through the call processing Processing will be performed.

In addition, the PDSN (4) performs the function of generating the billing information according to the call processing, if a failure occurs in the PDSN (4), the service is interrupted due to the interruption of the service to the subscriber to the damage that is interrupted There is a problem that the billing information is lost, causing economic loss to the service provider.

Accordingly, duplication processing for a packet processing apparatus, such as a PDSN, that performs packet data processing in a wireless packet data network is required.

Accordingly, the present invention has been made in view of the above-described circumstances, and groups at least two or more packet processing apparatuses, maintains session information between the packet processing apparatuses, and sets a group of relative packet processing when a failure occurs in an arbitrary packet processing apparatus. It is a technical object of the present invention to provide a method and system for duplexing a packet processing apparatus in a wireless packet data network that can stably provide a communication service by continuously performing packet data processing of a failed packet processing apparatus in a device. .

1 is a view showing a schematic configuration of a general wireless packet data network.

2 is a view for explaining the configuration of a duplication system of a packet processing apparatus according to the present invention.

FIG. 3 is a diagram showing an information table configuration of the data memories 120 and 220 shown in FIG.

4 is a diagram showing a message format between the packet processing units 110 and 210 shown in FIG.

5 to 6 are views for explaining a duplication method of a packet processing apparatus according to the present invention.

******* Brief description of the main parts of the drawing *******

100,200: PDSN (packet processing unit), 110,210: packet processing unit,

120,220: data memory, 130,230: session information storage unit,

140,240: other session information storage unit.

The duplexing method of a packet processing apparatus in a wireless packet data network according to the first aspect of the present invention for achieving the above object, performs communication with a wireless terminal and the IP network using a common IP, between the wireless terminal and the IP network In a wireless packet data network including a plurality of packet processing apparatuses for processing various packet data for call processing and path control, a group setting step of setting at least two or more packet processing apparatuses into one group, and packet processing The device processes the packet data received through its own public IP, and stores session information, which is call connection information on the packet data currently being processed, in the first memory, and sends the session information to another packet processing device grouped. A session information transmitting step of storing a session information received from another packet processing apparatus set in a group in a second memory; When predetermined failure occurrence information is received from another packet processing apparatus, the packet data processing step of registering a common IP of another packet processing apparatus and performing packet data processing based on session information stored in the first and second memories is performed. Characterized in that it comprises a.

In addition, the redundant system of the packet processing apparatus in the wireless packet data network according to the second aspect of the present invention for achieving the above object, performs communication with the wireless terminal and the IP network using a common IP, between the wireless terminal and the IP network In a wireless packet data network comprising a plurality of packet processing apparatuses for processing various packet data for call processing and path control, at least two or more packet processing apparatuses are set as one group, and each packet processing apparatus A data memory for storing a common IP for communication with the wireless terminal and the IP network, a session information storing means for storing session information currently being connected, and another for storing session information of a group-configured counterpart packet processing apparatus. Session information storage means and packet data received through its own public IP, and in addition to the group set packet processing device And a packet processing unit that registers the public IP of the counterpart packet processing apparatus based on the session information stored in the other session information storage means by registering the public IP of the counterpart packet processing apparatus. The packet processing unit of the packet processing apparatus may control to delete its own public IP.

That is, according to the present invention, if at least two packet processing apparatuses are grouped and a failure occurs in an arbitrary packet processing apparatus, packet processing is performed by continuously performing packet data processing of a failed packet processing apparatus in a grouped counter packet processing apparatus. It is possible to ensure stable service provision such as minimizing service interruption and loss of billing information due to device failure.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a view for explaining the configuration of the redundant system of the packet processing apparatus according to the present invention.

As shown in FIG. 2, the duplexing system of the packet processing apparatus according to the present invention is combined with the base station controller 3 and the IP network 5 through a virtual LAN (VLAN), respectively, to the base station controller 3 and the IP network 5. The first and second PDSN (100, 200) for processing the packet data transmitted and received between.

The first and second PDSNs 100 and 200 have unique private IPs and perform IP communication using the private IPs. In addition, the first and second PDSNs 100 and 200 are configured to communicate with the base station controller 3 and the IP network 5 using the shared IP assigned thereto.

In this case, the first and second PDSNs 100 and 200 independently process packet data applied from the first and second input / output terminals, respectively.

The first and second PDSNs 100 and 200 may respectively include packet processing units 110 and 210 and base station controllers 3 to perform packet data processing according to overall call processing between the base station controller 3 and the IP network 5. ) And data processing (120,220) for storing the predetermined access information for data transmission and reception with the IP network (5), call processing information processed in the corresponding PDSN (100,200), in particular, the wireless terminal information and destination information, the route that is connected to the call A session information storage unit 130 and 230 for storing session information including information, and another session information storage unit 140 and 240 for storing session information of the corresponding PDSN 100 and 200 and the counterpart PDSN 200 and 100 grouped together; It is configured to include.

Here, the packet processing unit (110, 210) is provided with a predetermined connection port for physically coupling with the base station controller 3 and the IP network (5), the data memory (120, 220) as shown in Figure 3 base station controller And an information table corresponding to the side connection port and an information table corresponding to the IP network side connection port. The information table includes interface information for logically connecting to an external device, that is, a base station controller and an IP network, a private IP for communicating with other packet processing units, a public IP for communicating with the outside through an access port, It is composed of a memory area for storing public IP information of another grouped PDSN. At this time, the public IP and other public IP information is written / deleted by the packet processing unit (110, 210).

In addition, the first and second packet processing units 110 and 210 independently perform packet data processing for the call connection request from the base station controller 3, and their session information stored in the session information storage units 130 and 230, respectively. Is provided to the relative packet processing unit (110, 120) through a private IP. This is to allow the relative packet processing unit (110, 120) to substitute for the processing of its own packet data in the event of a failure.

Meanwhile, the first and second packet processing units 110 and 210 transmit and receive information in a predetermined message format through their own private IP, and the message format is shown in FIG. 4. That is, as shown in FIG. 4, the message format between the packet processing units 110 and 210 includes 4 bits of version information, 8 bits of packet number information, 16 bits of PDSN unique number information, 8 bits of message type information, and the like. It consists of 4 bits of interface information, 4 bits of flag information, 16 bits of data length information, and data information.

The type of the message type information is as shown in Table 1.

(Less than 100)

Message type name Value Message content ECHO_REQ One Message for availability judgment ECHO_RESP 2 Response to ECHO_REG FAULT_REP 3 Message to inform the occurrence of failure DATA_TRANSFER 5 Message for data transmission RESTART_REP 6 Message to announce failover SERVICE_READY 7 Message to indicate serviceability SESSION_ACTIVE 8 Message for adding session SESSION__DEACTIVE 9 Message for deleting session

In this case, the message type "ECHO_REQ" is a message that is periodically sent to the counterpart PDSN, and the counterpart PDSN transmits the response message "ECHO_RESP" message to the corresponding PDSN.

In FIG. 4, the interface information indicates the type of interface used for message transmission, and is set to "1" for an interface corresponding to the base station side and "2" for an interface corresponding to the IP network side.

In FIG. 4, flag information indicates detailed status information of a message, and the types thereof are shown in Table 2.

State name Value Contents REQ One Response request status ACK 2 Reception response status NAK 3 Unanswered state REJ 4 Rejection status DATA_READY 9 Data start state DATA_REQ 10 Data request status DATA_ACK 11 Data response state DATA_NAK 12 Data unresponsive state DATA_END 13 Last data DATA_CON 14 Data control status

Next, a duplication processing method of the packet processing apparatus having the above configuration will be described with reference to FIGS. 5 and 6.

5 is a view for explaining the operation of the packet processing apparatus in a steady state in a wireless packet data network according to the present invention.

First, the first PDSN 100 and the second PDSN 200 are set as one group. At this time, the group setting may be arbitrarily set by the administrator or may be configured through the base station controller 3. Herein, the grouped PDSNs are allocated the private IP and the public IP for each access port of the corresponding PDSN.

In the above state, when predetermined call connection request information in the form of a packet is applied from the wireless terminal 1 to the first PDSN 100 through the base station 2 and the base station controller 3 (ST1), the first PDSN 100 ) Decapsulates the received packet information, confirms that it is call connection request information, allocates predetermined IP information to the corresponding radio terminal 1, and performs call processing with the destination for requesting authentication and connection. It is performed (ST2).

That is, the first PDSN 100 establishes a communication path between the radio terminal 1 and the destination coupled to the IP network 5.

In addition, the first PDSN 100 stores the predetermined session information including the wireless terminal information and the destination information, and the communication path information between the wireless terminal and the destination, together with the setting of the communication path, to the first session information storage unit 130. It is stored (ST3).

Thereafter, the first PDSN 100 transmits the packet data applied from the wireless terminal 1 to the destination through the IP network 5 on the basis of the session information stored in the first session information storage unit 130. A series of packet data processing operations for performing path control to transmit packet data applied from an arbitrary destination through the network 5 to the corresponding radio terminal 1 is performed (ST4).

In addition, the first PDSN 100 transmits its own session information, that is, the first session information stored in the first session information storage 130 to the second PDSN 200 grouped through the private IP (ST5). . At this time, when the session information is sent from the first PDSN 100, the message format has a message type information of " 8 " and its status information set to " 1 ". In response to this, the second PDSN 200 transmits a message for confirming the session information addition request of which the message type information is "8" and the status information is "2" to the first PDSN 100. Thereafter, the first PDSN 100 sets the message type information to "5" to transmit its session information, that is, the first session information to the second PDSN 200.

Meanwhile, the second PDSN 200 stores first session information applied from the first PDSN 100 in the second third session information storage unit 240 and stores predetermined first session reception confirmation information in the first PDSN 100. ) Will be sent (ST6, ST7).

Subsequently, when predetermined call cancellation request information is applied from the wireless terminal 1 to the first PDSN 100 (ST8), the first PDSN 100 performs the normal call release processing based on the first session and the first session. The session information corresponding to the wireless terminal 1 stored in the information storage unit 130 is deleted (ST9).

In addition, the first PDSN 100 transmits predetermined deletion request information on the first session information released to the PDSN2 200 (ST10).

Then, the second PDSN 200 retrieves the deletion request first session information applied from the first PDSN 100 from the second other session information storage unit 240 and deletes it (ST11).

In addition, the second PDSN 200 transmits a message having a message type of "9" and its status information to "2", that is, predetermined acknowledgment information to the first PDSN 100 (ST12).

That is, the grouped first PDSN 100 and the second PDSN 200 provide the session information being processed to the counterpart PDSN, but provide the corresponding session information to the counterpart PDSN in real time whenever the session information is added / deleted. It is operated to hold the same session information as the current session information of the PDSN.

Next, the duplication processing operation in the case where a failure occurs in the first PDSN 100 will be described with reference to FIG.

First, as shown in FIG. 6, real-time update processing of session information between the grouped first PDSN 100 and the second PDSN 200 is performed, and the first PDSN 100 and the second PDSN 200 normally operate. In the state of performing packet data processing (ST51), if the first PDSN 100 is rebooted, or if a predetermined failure occurs due to a defect on a previous line, a bad state of an internal component, etc., the first PDSN 100 The first packet processing unit 110 deletes its own public IP information stored in the first data memory 120 (ST52). That is, the first packet processing unit 110 deletes the common IP information of each information table in the first data memory 120 as shown in FIG.

In addition, the first PDSN 100 transmits predetermined failure occurrence information to the second PDSN 200 (ST53). This is applied to the second PDSN 200 in the form of a message having a message type of "3" and a flag of "1" in the message format as shown in FIG. 4, whereas the second PDSN 200 has a message type of "3". &Quot; and the flag " 2 " transmit the failure occurrence confirmation information in the form of a message to the first PDSN 100 (ST54).

Subsequently, the second packet processing unit 210 of the second PDSN 200 adds the public IP of the first PDSN 100 to the second data memory 220 (ST55). That is, the public IP of the first PDSN 100 is written as other public IP information in the information table for each connection port of the second data memory 220 as shown in FIG.

Accordingly, both connection ports of the second packet processing unit 210 of the second PDSN 200, that is, the base station controller side connection port and the IP network side connection port are applied to the second PDSN 200 and the first PDSN 100. It is possible to receive a packet including an IP. In addition, at this time, the second PDSN 200 is in a state of holding session information provided from the first PDSN 100 before failure occurs.

Accordingly, the second packet processing unit 210 of the second PDSN 200 may include packet data including its own public IP based on the second session information storage unit 230 and the second other session information storage unit 240. The packet data including the public IP of the first PDSN 100 can be processed (ST56). In this case, the second PDSN 200 updates the second session information storage unit 230 and the second third session information storage unit 240 to correspond to the packet data processing.

Meanwhile, when the failure of the first PDSN 100 is recovered while the second PDSN 200 is processing packet data of the first PDSN 100 due to the failure of the first PDSN 100, the first PDSN 100 may recover. The first packet processing unit 110 transmits predetermined failure recovery information to the second PDSN 200 (ST57). In this case, the failover information has a message type in which the message type is "6" and the flag is set to "1" in the message format of FIG.

Subsequently, the second PDSN 200 transmits predetermined failure recovery confirmation information with respect to the failure recovery information in step ST57, and the first PDSN 100 currently stored in the second other session information storage unit 240. ) Session information is transmitted to the first PDSN 100 (ST58).

The first packet processing unit 110 of the first PDSN 100 stores the session information for the first PDSN provided from the second PDSN 200 in the first session information storage unit 130 (ST59).

Thereafter, when the reception and storage processing of the session information for the first PDSN from the second PDSN 200 ends, the first PDSN 100 transmits predetermined service availability information to the second PDSN 200 (ST60). . At this time, the serviceability information has a message format in which the message type is "7" and the flag is set to "1".

Also, the second PDSN 200 sends predetermined service availability confirmation information to the first PDSN 100 in response to the reception of service availability information from the first PDSN 100, and the service availability confirmation information has a message type of "7." &Quot; and the message format is set to " 2 " (ST61).

Meanwhile, the first packet processing unit 110 of the first PDSN 100 adds its own public IP information to the first data memory 120 (ST62). That is, the first data memory 120 stores interface information, private IP, and public IP in the connection table information table as shown in FIG.

Accordingly, packet data including the public IP for the first PDSN 100 is received as the connection port of the first packet processing unit 110 of the first PDSN 100 to perform packet data processing (ST63). .

Meanwhile, the second packet processing unit 210 of the second PDSN 200 deletes the public IP for the first PDSN 100 from its second data memory 220 after performing the step ST61 (ST64). . That is, the second data memory 220 stores interface information, private IP, and public IP in the information table for each connection port as shown in FIG.

Accordingly, only the packet data including the public IP for the second PDSN 200 is received as the connection port of the second packet processing unit 210 of the second PDSN 200 to perform packet data processing (ST65). ).

That is, in the above embodiment, when the failure of the first PDSN occurs, packet processing for the first PDSN is continuously performed in the second PDSN, and after session recovery of the first PDSN, the session information of the first PDSN being processed in the second PDSN is stored. 2 It is possible to perform independent packet data processing provided from PDSN.

Therefore, according to the present invention, if at least two packet processing apparatuses are grouped and a failure occurs in any packet processing apparatus, packet processing is performed by continuously performing packet data processing of the failed packet processing apparatus in a grouped counter packet processing apparatus. It is possible to ensure stable service provision such as minimizing service interruption and loss of billing information due to device failure.

Meanwhile, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical spirit of the present invention.

For example, in the above embodiment, when the failure occurs, the PDSN having a failure transmits its own failure information to the counterpart PDSN set as a group. However, the status information is configured to be transmitted and received at a predetermined main interval between the grouped PDSNs. If it is not received, it is also possible to determine that the other PDSN as a failure state to perform packet data processing for the other PDSN. At this time, the PDSN which performs packet processing of the failed PDSN periodically sends status request information to the failed PDSN, and when predetermined failure recovery information is received from the failed PDSN, call connection session information for the failed PDSN. It may be desirable to send the message to the failover PDSN.

As described above, according to the present invention, at least two packet processing apparatuses are grouped so that when a random packet processing apparatus fails, the grouped counter packet processing apparatus continuously performs packet data processing of the failed packet processing apparatus. In addition, it is possible to guarantee stable service provision such as minimizing service interruption and loss of billing information due to the failure of the packet processing apparatus.

Claims (10)

A wireless packet data network comprising a plurality of packet processing apparatuses for communicating with a wireless terminal and an IP network using a common IP and processing various packet data for call processing and path control between the wireless terminal and the IP network. To A group setting step of setting at least two or more packet processing apparatuses into a group; The packet processing apparatus processes the packet data received through its public IP and stores session information, which is call connection information on the packet data currently being processed, in the first memory, and the session information is grouped with another packet processing apparatus. Session information transmission step to send to, Another session information storing step of storing session information received from another packet processing apparatus set in a group in a second memory; When predetermined failure occurrence information is received from another packet processing apparatus, the packet data processing step of registering a common IP of another packet processing apparatus and performing packet data processing based on session information stored in the first and second memories is performed. Redundancy method of a packet processing apparatus in a wireless packet data network comprising a. The method of claim 1, The failure packet processing apparatus is a duplication method of a packet processing apparatus in a wireless packet data network, characterized in that it comprises a public IP deletion step of deleting its own public IP when a failure occurs. The method of claim 1, The faulty first packet processing apparatus includes a fault recovery information transmitting step of transmitting predetermined fault recovery information to a second packet processing apparatus that is grouped when failing over; The second packet processing apparatus transmits session information stored in the second memory to the first packet processing apparatus based on the reception of the failure recovery information; The first packet processing apparatus registers its public IP after receiving the session information, performs packet data processing, and transmits predetermined service start information to the second packet processing apparatus. The second packet processing apparatus is configured to include another public IP deleting step of deleting the common IP of the first packet processing apparatus based on the service start information. . The method of claim 3, The second packet processing apparatus sends predetermined confirmation information corresponding to the reception of service start information received from the first packet processing apparatus to the first packet processing apparatus, The first packet processing apparatus duplicates the packet processing apparatus in a wireless packet data network, when receiving confirmation information on service start information from the second packet processing apparatus, processes the packet data through its public IP. Way. The method of claim 1, The packet processing apparatus periodically transmitting its own state information to the counterpart packet processing apparatus set in a group; The packet processing apparatus includes a failure determining step of determining that a failure has occurred in the counterpart packet processing apparatus when the status information is not received from the counterpart packet processing apparatus more than a predetermined time. Redundancy method. A wireless packet data network comprising a plurality of packet processing apparatuses for communicating with a wireless terminal and an IP network using a common IP and processing various packet data for call processing and path control between the wireless terminal and the IP network. To At least two or more packet processing apparatuses are set in one group, Each packet processing apparatus includes a data memory for storing a common IP for communication with the wireless terminal and an IP network, session information storing means for storing session information currently connected to a session, and session information of a grouped counterpart packet processing apparatus. Other session information storage means for storing the information and the packet data received through its own public IP, and in the event of a failure in the group-configured counterpart packet processing device, registers the public IP of the counterpart packet processing device to the other public IP. And a packet processing unit for processing the packet data received through the session information stored in the other session information storage means. The packet processing unit of the failed packet processing apparatus duplication system of the packet processing apparatus in the wireless packet data network, characterized in that for controlling to delete the own IP. The method of claim 6, When the failure is recovered, the first packet processing unit of the failed first packet processing apparatus sends the failure recovery information to the second packet processing unit of the grouped second packet processing apparatus, and the first packet processing provided from the second packet processing unit. After receiving the session information of the device is configured to register its public IP in the data memory to perform packet data processing, The second packet processing unit of the second packet processing apparatus transmits session information of the first packet processing apparatus stored in the other session information storage unit to the first packet processing unit based on the reception of the failure recovery information from the first packet processing unit. And the common IP of the first packet processing apparatus registered in the data memory is deleted. The method according to claim 6 or 7, And the packet processing apparatus is configured to receive a unique private IP, and is configured to communicate with a state packet processing apparatus grouped using the private IP. The method of claim 6, The grouped packet processing apparatus is configured to transmit predetermined failure occurrence information to the grouped state packet processing apparatus when a failure state is detected. The method of claim 6, The packet processing apparatus periodically transmits its status information to the counterpart packet processing apparatus grouped, and determines that the counterpart packet processing apparatus has failed when status information is not received from the counterpart packet processing apparatus more than a predetermined time. Redundancy System of Packet Processing Unit in Wireless Packet Data Network.