KR101120400B1 - Method for Processing Message in SGSN for Sharing GGSN - Google Patents

Abstract

The present invention relates to a message processing method in an SGSN capable of duplexing GGSNs by allowing SGSNs to share GGSNs with each other without separately installing GGSNs, which are core nodes of a WCDMA packet network. In the message processing method in SGSN, when receiving a PDP context activation request message (APCQ) from the mobile station, querying the access point name (APN) requested by the mobile station to the DNS server to obtain at least two corresponding GGSN IP addresses Stage 1; After setting one of the obtained two GGSN IP addresses as the primary IP address and the other as the secondary IP address, after transmitting a PDP context creation request message (CPCQ) to the GGSN having the primary IP address, a response message Waiting for reception of the second step; A third step of transmitting a PDP context creation request message to the GGSN having the secondary IP address and waiting to receive the response message if the response message is not received from the GGSN having the primary IP address in the standby state; And a fourth step of transmitting a PDP context activation acceptance message to the mobile station upon receiving a response message from the GGSN having the primary IP address or the GGSN having the secondary IP address.

WCDMA, Packet, GGSN, SGSN, Redundant, Shared

Description

Method for Processing Message in SGSN for Sharing GGSN

1 is a schematic block diagram of a typical WCDMA packet network.

2 is a network configuration of sharing a GGSN in a WCDMA packet network.

3 is a flowchart illustrating a message processing method in SGSN according to the present invention;

The present invention relates to a message processing method in SGSN for sharing a Gateway GPRS Support Node (GGSN) in an asynchronous code division multiple access (WCDMA) packet network, and more particularly, by a serving GPRS support node (SGSN) sharing GGSNs with each other. In addition, it relates to a message processing method in SGSN that can be duplicated without installing GGSN.

In general, the WCDMA General Packet Radio Service (GPRS) includes two nodes, a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN).

The SGSN tracks the location of the mobile station within its service area, sends packets to the mobile station, receives packets from the mobile station, and sends the received packets to a Radio Network Controller (RNC) or the GGSN. To pass. The GGSN receives packets from an external network and forwards the received packets to the SGSN or receives packets from the SGSN and forwards the received packets to the external network.

1 is a block diagram of a typical WCDMA packet network.

Referring to FIG. 1, a UMTS network includes a base station (Node B) 20 for accessing a mobile station (MS) 10 for a specific service and a radio network controller (RNC) 30 for controlling the base station 20. It consists of a Radio Access Network (RAN) and a Core Network (CN). The core network CN includes a serving GPRS support node (SGSN) 40 and a gateway GPRS support node (GGSN) 50. The mobile station user can receive data stored in a data server of an external network through the UMTS network.

The SGSN 40 is a serving node of a general packet radio service (GPRS) serving a packet transmitted by the mobile station 10 in a management area or directed to the mobile station 10, and has mobility to the packet mode of the mobile station. By setting a mobile management context, it is responsible for packet mode data service management of the mobile station. In other words, the functions performed by the SGSN 40 include packet routing and forwarding, attach, detach, location management, logical link management, and authentication and billing. The SGSN 40 establishes a PDP context and delivers a service data unit (SDU) using GPRS Tunneling Protocol (GTP) tunneling for mobility processing, registration, and authentication support of the mobile station.

The GGSN 50 is a GPRS gateway node located directly between the GPRS backbone network and the Internet 60, which is an external packet data network, and directly connected to the Internet 60. GPRS has tunneling and Internet Protocol (IP) routing functions by maintaining routing information to SGSN 40. The GGSN 50 is connected to the SGSN 40 through a Gn interface.

In this case, the routing information is information obtained by viewing a destination address among IP header contents of a packet to be transmitted and transmitting the result to a desired SGSN / GGSN or an external network and is a table generated by a routing protocol. Therefore, the packet transmitted from the SGSN 40 is converted into an appropriate PDP (Packet Data Protocol) format through the GGSN 50 and sent to a server connected to the counterpart Internet. Conversely, a packet from an external Internet server goes through the reverse. At this time, the GGSN 50 attaches an IP / UDP / GTP header to the IP packet transmitted from the external Internet server, and removes the protocol stack IP / UDP / GTP header from the IP packet transmitted from the SGSN 40.

The GGSN 50 needs to know the SGSN currently managing the mobile station in order to deliver the packet received from the external Internet server to the mobile station. Thus, GGSN 50 stores the user's current SGSN information with the user profile in the PDP context. In addition, the main functions of the GGSN 50 include IP address assignment and management to mobile stations, point-to-point protocol (PPP) generation, termination and relay, and screening for connection services to ISPs or other Internet Service Providers (ISPs). (screening) function.

In this WCDMA packet network, GGSN duplication is essential to ensure network reliability. However, to duplicate GGSN, GGSN had to be installed separately.

Accordingly, the present invention is to solve the problems of the prior art as described above, the object of the present invention is to install the GGSN, which is the core node of the WCDMA packet network separately, so that SGSNs share the GGSN with each other, it is possible to duplicate the GGSN It is to provide a message processing method in SGSN.

In order to achieve the above object, the present invention provides a message processing method in SGSN of a WCDMA packet network including a mobile station, a serving GPRS support node (SGSN), and a GPRS gateway support node (GGSN). Receiving a request for activation message (APCQ), querying an access point name (APN) requested by the mobile station to a DNS server to obtain at least two corresponding GGSN IP addresses; After setting one of the obtained two GGSN IP addresses as the primary IP address and the other as the secondary IP address, after transmitting a PDP context creation request message (CPCQ) to the GGSN having the primary IP address, a response message Waiting for reception of the second step; A third step of transmitting a PDP context creation request message to the GGSN having the secondary IP address and waiting to receive the response message if the response message is not received from the GGSN having the primary IP address in the standby state; And a fourth step of transmitting a PDP context activation acceptance message to the mobile station upon receiving a response message from the GGSN having the primary IP address or the GGSN having the secondary IP address.

In the following description, in describing the method for downloading a multimedia message to a receiving terminal according to the present invention, description thereof will be omitted for general technical contents that may obscure the technical gist of the present invention. And the detailed description according to the present invention described below is only for explaining one example, it will be apparent that those skilled in the art can easily be modified from the technical idea according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3.

2 is a diagram illustrating a network configuration for sharing a GGSN in a WCDMA packet network, and FIG. 3 is a flowchart illustrating message processing in an SGSN according to the present invention.

In order to carry out the redundancy method according to the invention, SGSN 40 is connected with at least two GGSNs (GGSN1, GGSN2). That is, SGSN 40 is connected to GGSN2 80 appropriately logically and / or physically, without using GGSN1 50 in the middle.

The home location register (HLR) includes a mobile station identifier and a PDP address, such as MS-ISDN or IMSI (International Mobile Station Identity), which is subscriber data of the mobile station.

For convenience of explanation, in FIG. 2, the GGSN1 50 is the main GGSN, and the GGSN2 80 is the secondary GGSN.

The mobile station 10 sends an PDP context activation request message (APCQ), which is a PDP connection request message for access to the external network, to the SGSN 40. At this time, the APCQ message includes a Protocol Configuration Option (PCO) and an Access Point Name (APN) containing information about the protocol. At this time, only the minimum necessary air channel is secured between the mobile station 10 and the RNC 30.

When SGSN 40 receives the APCQ message (101), it obtains two GGSN IP addresses by querying the APN through DNS 70 to perform the requested PDP connection (102). After setting one of the obtained IP addresses as the primary IP address and the other as the secondary IP address, a GTP tunnel with the GGSN 50 of the primary IP address is generated. The APN is an identifier for identifying a specific service. The SGSN 40 obtains a corresponding GGSN address through the APN.

In this case, the SGSN obtains two GGSN IP addresses. The SGSN 40 checks the QoS bandwidth for the GTP tunnel, secures resources, and allocates an end identifier (TEID_SGSN). It then searches the routing table for the GGSN of the primary IP address to find the Gn port address according to its Gn interface, which has the lowest cost.

In addition, an Iu port address according to the interface Iu between the RNC 30 and the SGSN is obtained using the RNC-ID transmitted from the RNC 30. Subsequently, in response to the APCQ, the SGSN 40 stores the Gn-port address and its assigned TEID_SGSN in a PDP context request message (CPCQ: Create PDP Context Request), which is the PDP connection request message. Transmit to GGSN 50 (103). It then waits 104 to receive a response from the GGSN 50.

In general, the GGSN 50 performs an authentication procedure with an external server according to the APN in response to the CPCQ, and obtains a PDP address to be used by the terminal according to a service type. Here, the PDP address may be assigned by the GGSN as an address of an Internet host server providing a service requested by the terminal, or may be assigned by an external server such as DHCP. Subsequently, the GGSN 50 generates a Gn port address according to its assigned terminal identifier (TEID_GGSN) and its own GN interface in a PDP context response message (CPCR: Create PDP Context Response) which is a PDP connection response message. Send to SGSN 40.

However, when SGSN 40 does not receive the CPCR message from the primary GGSN in the standby state, the CPCQ message is repeatedly transmitted to the primary GGSN at a predetermined cycle. Subsequently, if the generated PDP connection response message (CPCR), which is a response message, is not received from the primary GGSN 50, the CPCQ message is transmitted to the GGSN of the secondary IP address of the obtained two IP addresses (107). Likewise, the SGSN waits to receive a response message from the secondary GGSN (108). If the response message is not received in the standby state, the SGSN repeatedly transmits an arbitrary number of CPCQ messages to the secondary GGSN at regular intervals as described above.

Upon receiving a CPCR message, which is a response message from the primary or secondary GGSN, the SGSN sends a RAB Request message to the RNC 30 to create a tunnel with the RNC 30. The RAB request message includes an Iu port address and a TEID_SGSN. The RNC 30 secures an air channel in accordance with the QoS requested by the SGSN 40 in response to the RAB request message, and includes the terminal identifier TEID_RNC assigned by the RNC and the IP address of the RNC to be serviced. Send to 40. The SGSN 40 then sends an Activate PDP Context Accept (APCA) message, which is a PDP connection response message, to the mobile station. From this point, the mobile station can provide packet service with its own server and can communicate with an external Internet host server.

According to the present invention as described above, for the duplication of the GGSN, which is the core node of the WCDMA packet network, by sharing the GGSN already installed with each other, there is an effect that can realize the duplication for ensuring the reliability of the network .

Claims (2)

In the message processing method in SGSN of a WCDMA packet network including a mobile station, a serving GPRS support node (SGSN), and a GPRS gateway support node (GGSN), Receiving a PDP context activation request message (APCQ) from a mobile station, querying an access point name (APN) requested by the mobile station to a DNS server to obtain at least two corresponding GGSN IP addresses; After setting one of the obtained two GGSN IP addresses as the primary IP address and the other as the secondary IP address, after transmitting a PDP context creation request message (CPCQ) to the GGSN having the primary IP address, a response message Waiting for reception of the second step; A third step of transmitting a PDP context creation request message to the GGSN having the secondary IP address and waiting to receive the response message if the response message is not received from the GGSN having the primary IP address in the standby state; And And receiving a response message from the GGSN having the primary IP address or the GGSN having the secondary IP address, and sending a PDP context activation accept message to the mobile station. The method of claim 1, If the response message is not received from the GGSN having the primary IP address within a predetermined time in the second step, the PDP context activation request message is repeatedly transmitted any number of times.

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