CN1845637A - A mobile communication access system and method - Google Patents

Abstract

The related access method for mobile communication comprises: the DNS analyzes visited IP address of agent node according to general access name from GPRS service node; the visited GPRS service support node builds data connection and sends request to the agent node; the latter analyzes to obtain the attributed IP address and resend the request information to the attributed GPRS gateway; once receiving information, the gateway responses to the visited GPRS node; then the latter sends receiving information to user and builds data corresponding communication.

Description

A mobile communication access system and method

technical field

The present invention relates to a communication system, in particular to a home access system and method.

Background technique

The General Packet Radio Service (GPRS) network is mainly composed of network elements such as GPRS Serving GPRS Support Node (SGSN, ServingGPRS Support Node), GPRS Gateway Support Node (GGSN), Charging Gateway (CG) and Domain Name Server (DNS), among which SGSN is responsible for Access monitoring of GPRS users. GGSN is the interface between GPRS network and external packet data network (such as: Internet, enterprise private network, etc.). The DNS resolves the access point name (APN) of the user terminal into the corresponding IP address of the GGSN, and provides routing information for the SGSN, so that the user can access the correct external data network.

By deploying GPRS wireless packet network on the existing network, mobile operators enable mobile users to enjoy wireless data access while enjoying wireless voice access. And with the vigorous rise of data value-added services, all mobile operators have increased their investment in wireless data services before the arrival of 3G. How to ensure the operating income of investors, prevent user data service arrears, and do a good job for users? Credit monitoring is a problem that major operators have not fundamentally solved for many years.

For domestic roaming users, the current wireless data access point is the visited GGSN. For international roaming users, the current wireless data access point is the international GGSN. Usually the international GGSN is only set up in individual cities in China. However, the management data of the user is stored in the place of origin, so the billing of the data service used by the roaming user cannot be monitored in real time, and other billing schemes can only be adopted, such as the billing of the BOSS system, which is carried out by sending the call bill in a different place and then returning to the place of origin. Fee deduction, unable to monitor user access behavior in time, resulting in user arrears, especially the greater the amount of malicious arrears data, the greater the operator's loss. At the same time, considering that the 3G network will vigorously develop data services in the future and carry out content billing for it, the content billing policy is defined on the GGSN, if it cannot return to the home GGSN to access, the roaming user cannot enjoy the content tariff defined by the province , which is not conducive to the development of data services.

The access point name (APN) set by the user terminal marks the external data network accessed by the user. Divided into two categories by use:

One is the APN allocated for the external data network that supports access to the entire network, also known as the general APN, such as WAP-Access, this type of APN does not include the user's home area information, and the general APN set by users in different provinces All the same; another kind of APN is to allocate APN (enterprise private network access) for the external data network with non-network-wide access, also known as regional APN, like isp.com.bj, this type of APN includes the user's attribution area information.

The APN resolution and access point selection process is defined in the 3G Communication International Standards Organization document 3GPP TS 23.060 Appendix A (APN and GGSNSelection).

As shown in Figure 1, the SGSN first judges the APN(R) reported by the user. When the APN(R) reported by the user is the correct contracted APN, the SGSN will extend the operator’s logo to the APN(R) and send it to DNS query. For roaming users, it is assumed that the SGSN in the roaming area completely follows the standard procedure of 3GPP, and performs APN analysis and access point selection for such users. It can be seen from the above standard process that for two common forms of APN settings for user terminals (general APN such as WAP-Access and regional APN such as isp.com.bj), the query request initiated by SGSN to DNS is finally :

APN(R).MNC<mnc>.MCC<mcc>.gprs

If the end user sets the regional APN, since it contains the region information of the region of origin, it can normally return to the region of origin GGSN for access through DNS resolution.

If an end user sets a general APN, the general APN reported by roaming users in different provinces is the same. Since the region information is not included, currently, for domestic roaming users, the DNS resolves to the visiting GGSN uniformly. Under the joint resolution of DNS, it can only be resolved to the international GGSN of the home country in a unified manner. Using the international GGSN as the wireless data access point of international roaming users cannot solve the requirements of mobile users to access the home GGSN when roaming.

Contents of the invention

The technical problem to be solved by the present invention is to provide a mobile communication access system and method. The present invention adds a device node named GGSN agent in the network, without changing the mobile phone terminal settings and roaming network device settings. To complete the home access of roaming users. Therefore, the user's wireless data access point is positioned at the GGSN at the home location, because the user's management data and credit monitoring information are set at the home location, so that all billing information of the user can be collected in real time to ensure credit monitoring of the wireless data service.

In order to achieve the above object, the present invention provides a mobile communication access method for home access of roaming users, including the following steps:

The domain name server (DNS) resolves the IP address of the proxy node (GGSN-PROXY) according to the general access point name (APN) reported by the visiting place GPRS service support node (SGSN, Serving GPRSSupport Node);

The visited GPRS service support node (SGSN, Serving GPRS Support Node) establishes a data connection with the proxy node, and sends a request message (create PDP context request) to the proxy node;

According to the above request information (create PDP context request), the agent node resolves to obtain the IP address of the attributable GPRS gateway support node (GGSN, Gateway GPRS Support Node);

Proxy node forwards the above-mentioned request information (create PDP context request) to the home GPRS gateway support node (GGSN, Gateway GPRSSupport Node) according to the IP address of the above-mentioned home GPRS gateway support node (GGSN, Gateway GPRSSupport Node);

Home place GPRS gateway support node (GGSN, Gateway GPRS Support Node) after receiving above-mentioned request information, replies response message (create PDP context response) to visiting place GPRS service support node (SGSN, Serving GPRS Support Node);

After receiving the above response information, the visited GPRS service support node (SGSN, Serving GPRS Support Node) sends an acceptance message (activate PDP context accept) to the user, and establishes data communication between the user and the home network.

Wherein, after receiving the above request information, the proxy node analyzes the numbers carried in the request information (create PDPcontext request) that contain the attribution information of the roaming user, including the mobile station integrated services digital network number (MSISDN) or the international mobile station identification number ( IMSI), obtain the IP address of the home GPRS gateway support node (GGSN, Gateway GPRS Support Node).

Wherein, after receiving the above request information, the proxy node obtains the attributable GPRS Gateway Support Node (GGSN, Gateway GPRS Support Node) by analyzing the mobile station integrated services digital network number (MSISDN) of the roaming user carried in the request information (create PDPcontext request). Node's IP address.

Wherein, before the proxy node forwards the request information (create PDP context request) to the home GPRS gateway support node (GGSN, Gateway GPRSSupport Node), the IP layer destination address of the request information is modified to the above-mentioned home GPRS gateway support node (GGSN, Gateway GPRSSupport Node) IP address.

In order to achieve the above object, the present invention also provides a mobile communication access system for home access of roaming users, including an address resolution device, a connection device, a response device, and an establishment device, and is characterized in that it also includes a proxy node device, The proxy node device is used for resolving the home address, and forwarding the request information according to the home address.

Wherein, the proxy node device includes:

The number parsing device is used for parsing and obtaining the IP address of the GPRS gateway support node of the home according to the request information sent by the connecting device;

The forwarding device forwards the request information to the home GPRS gateway support node according to the IP address of the home GPRS gateway support node.

Wherein, after receiving the above request information, the number parsing device analyzes the number containing the attribution information of the roaming user carried in the request information (create PDPcontext request), including the mobile station integrated services digital network number (MSISDN) or the international mobile station identification number (IMSI), obtain the IP address of the attributable GPRS gateway support node (GGSN, Gateway GPRS Support Node).

Wherein, after receiving the above request information, the number parsing device obtains the home GPRS gateway support node (GGSN, Gateway GPRS) by analyzing the mobile station integrated services digital network number (MSISDN) of the roaming user carried in the request information (create PDPcontext request). Support Node) IP address.

Wherein, before the proxy node forwards the request information (create PDP context request) to the home GPRS gateway support node (GGSN, Gateway GPRSSupport Node), the forwarding device modifies the IP layer destination address of the request information to the above home GPRS gateway support node ( IP address of GGSN, Gateway GPRS Support Node).

Wherein, the forwarding device forwards the modified request information (create PDP context request) to the home GGSN.

After adding the GGSN proxy device node, there is no impact on the roaming SGSN, which still performs APN determination and access point selection according to the relevant standards of the 3G Communication International Standard Organization 3GPP. However, after the SGSN initiates a PDP data connection to the GGSN agent, the GGSN agent does not establish a PDP data connection channel with the SGSN like the usual GGSN equipment, but further assists the visiting SGSN and the home GGSN by analyzing and modifying the PDP data packet. Establish a data connection to meet the home access requirements of roaming users.

Description of drawings

Fig. 1 is a system flow chart in the prior art;

Fig. 2 is a system structure diagram of the present invention;

Fig. 3 is a schematic diagram of the system structure of the present invention;

Fig. 4 is a system flowchart of the present invention;

Fig. 5 is a system flowchart of the present invention.

Detailed ways

As shown in Figure 2, according to the mobile communication access system provided by the present invention, roaming users can realize attributable access, and the mobile communication access system includes an address resolution device, a connection device, a response device, an establishment device and a proxy node A device, the proxy node device is configured to resolve the home address, and forward the request information according to the home address. After the user sends the access request information, the address resolution device replies the IP address of the GGSN proxy to the visited SGSN, and the connection device establishes a data connection between the visited SGSN and the proxy node according to the IP address of the proxy node, and sends the request information to the proxy node (createPDP context request); the number parsing device analyzes and obtains the IP address of the place of attribution (home GGSN) according to the mobile station integrated services digital network number (MSISDN) of the roaming user carried in the above-mentioned request information (create PDP contextrequest); the forwarding device is to the request The IP layer destination address of the information (create PDP contextrequest) data packet is changed to the IP address of the above-mentioned home GGSN, and forwarded to the home GGSN; after receiving the above request information, the response device controls the home GGSN to reply to the visited SGSN message (create PDP context response); after the visiting SGSN receives the above response message, the establishment device sends an acceptance message (activate PDP context accept) to the user, and establishes data communication between the user and the home GGSN.

After adding the GGSN proxy device node, the access system of wireless data roaming users is shown in Figure 3.

If the end user sets the regional APN, it will return to the home GGSN for access under DNS resolution.

If the terminal user sets a general APN, under the DNS resolution, firstly, it returns to the GGSN proxy at the home location, and after further analysis by the GGSN proxy, it finally accesses through the GGSN at the home location. Finally, the attributable access of roaming data users is realized.

The following describes the functions of the GGSN agent in conjunction with the existing standard decision process, as shown in Figure 4.

In step 1, the entire judgment process conforms to the existing standard. When the visited SGSN receives the APN reported by the roaming user, the visited SGSN judges whether the APN reported by the user is legal or not according to the existing standard process. If it is illegal, the user is denied access. If legal, the visited SGSN pair will initiate an address query request to the DNS server, and the request includes complete APN information (including the APN network identifier APN-NI and the APN operator identifier APN-OI). In step S21, the DNS server replies to the IP address of the GGSN agent. In step S22, the visited SGSN establishes a data connection with the GGSN agent, and sends request information (create PDP context request) to the GGSN agent. In step S23, the GGSN agent The node obtains the mobile station integrated services digital network number (MSISDN) of the roaming user carried by it by analyzing the request data packet (create PDP context request); in step S24, the proxy node analyzes the MSISDN number to obtain the roaming user's attribution GGSN IP address. Then, in step S25, the GGSN proxy node revises the IP layer destination address of the PDP data connection request packet to the IP address of the attributable GGSN; in step S26, three layers of IP packets are forwarded, and the revised PDP data connection The request packet is forwarded to the home GGSN; in step S27, after the home GGSN receives the PDP connection request, it returns a "Create PDP Context Response" response to the visited SGSN, and then the visited SGSN will establish a normal connection with the home GGSN Data communication, so that roaming users can still complete the access requirements at home.

As shown in Figure 5, combined with the PDP data connection establishment message flow in the 3G Communication International Standards Organization document 3GPP TS 29.060 "GTP across the Gn and Gp interface", the GGSN agent is further described.

1) The roaming user sends an activate PDP context request message to the visited SGSN, which contains the APN information set by the user terminal.

2) After receiving the request, the visited SGSN judges whether to allow the user to access according to the subscription information of the user. If allowed, the visited SGSN will initiate a query request to the DNS server, and the request includes the complete information of the APN specified in the 3GPP standard (including the APN network identifier APN-NI and the APN operator identifier APN-OI).

3) The DNS server replies to the visited SGSN with the IP address of the GGSN agent.

4) The visited SGSN sends a create PDP context request message to the GGSN agent.

5) The GGSN agent parses the create PDP context request message, obtains the mobile station integrated services digital network number (MSISDN) information of the roaming user in it, and translates the IP address belonging to the GGSN.

6) The GGSN agent modifies the IP layer destination address of the received create PDP context request message to the home GGSN IP, and then forwards the create PDP context request message to the home GGSN.

7) After receiving the create PDP context request message containing the IP address of the visited SGSN, the home GGSN directly replies the create PDP context response message to the visited SGSN.

After receiving the create PDP context responses message, the visited SGSN obtains the IP address of the home GGSN from it, and successfully establishes a data connection with the home GGSN, and at the same time, the visited SGSN sends an activate PDP context accept message to the roaming user. So far, the mobile terminal can send service data to the home GGSN.

It can be seen from the above process that the GGSN proxy device should have the following functions:

Possess 3-7 layer protocol analysis capabilities, can identify PDP data connection packets, and extract MSISDN fields from them. Number segment analysis capability, can find the home GGSN address according to the MSISDN address. The ability to modify the IP layer destination address of the PDP data connection packet can change the original GGSN agent IP address to the belonging GGSN IP address. The forwarding capability of the PDP data connection packet can forward the modified PDP data connection packet to the home GGSN.

After adding the GGSN proxy device node, there is no impact on the roaming SGSN, which still performs APN determination and access point selection according to the relevant standards of the 3G Communication International Standard Organization 3GPP. It’s just that after the SGSN initiates a PDP data connection request to the GGSN agent, the GGSN agent does not establish a PDP data connection channel with the SGSN like the usual GGSN equipment, but further assists the visited SGSN and the attribution through the analysis and modification of the PDP data packet. The GGSN establishes a data connection to meet the roaming user's home access requirements.

Those skilled in the art can make various modifications to the above content without departing from the spirit and scope of the present invention defined by the claims. Therefore, the scope of the present invention is not limited to the above description, but is determined by the scope of the claims.

Claims (10)

1. A mobile communication access method, carrying out the home access of roaming users, is characterized in that, comprises the following steps: The domain name server resolves the IP address of the agent node according to the general access point name reported by the GPRS service support node of the visiting place; The visiting GPRS service support node establishes a data connection with the proxy node, and sends request information to the proxy node; The agent node analyzes and obtains the IP address of the attributable GPRS gateway support node according to the above request information; The proxy node forwards the request information to the home GPRS gateway support node according to the IP address of the home GPRS gateway support node; After receiving the above-mentioned request information, the home GPRS gateway support node replies the response information to the visited GPRS service support node; After receiving the above response information, the visited GPRS service support node sends acceptance information to the user, and establishes data communication between the user and the home network. 2. method as claimed in claim 1, it is characterized in that, agent node receives above-mentioned request information, obtains the IP address of attributable place GPRS gateway support node by analyzing the number that contains the information of roaming user's attributable place in the request information . 3. The method according to claim 1 or 2, wherein the proxy node receives the above-mentioned request information, and obtains the support of the home GPRS gateway by analyzing the mobile station ISDN number of the roaming user carried in the request information The IP address of the node. 4. method as claimed in claim 2, it is characterized in that, agent node is before attributable place GPRS gateway support node forwarding request information, the IP layer destination address of above-mentioned request information is revised to the IP of above-mentioned attributable place GPRS gateway support node address. 5. A mobile communication access system, which performs attributable access of roaming users, including address resolution means, connection means, answering means, and establishment means, is characterized in that it also includes a proxy node device, and the proxy node device is used for The attribution address is resolved, and the request information is forwarded according to the attribution address. 6. The system according to claim 5, wherein the proxy node device comprises: The number parsing device is used for parsing and obtaining the IP address of the GPRS gateway support node of the home according to the request information sent by the connecting device; The forwarding device forwards the request information to the home GPRS gateway support node according to the IP address of the home GPRS gateway support node. 7. The system according to claim 5 or 6, characterized in that, after receiving the request information, the number parsing device obtains the attributable GPRS gateway support node by analyzing the number that contains the roaming user's attribution information carried in the request information. IP address. 8. The method according to claim 7, wherein, after receiving the request information, the number parsing device obtains the attributable GPRS gateway support node by analyzing the mobile station ISDN number of the roaming user carried in the request information IP address. 9. system as claimed in claim 5, is characterized in that, before proxy node forwards request information to home place GPRS gateway support node, forwarding device revises the IP layer destination address of above-mentioned request information to above-mentioned home place GPRS gateway support node IP address. 10. The system according to claim 5, wherein the forwarding means forwards the modified request information to the home location.

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