Virtual addressing to support wireless access to data networks

• US 7,916,701 B1
• Filed: 08/27/2002
• Issued: 03/29/2011
• Est. Priority Date: 08/27/2002
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Centemeri, Marco C., Andriantsiferana, Laurent, Iyer, Jayaraman R., Viswanath, Kaartik, Tsao, Wen-Lin
• Primary Examiner(s): Kumar; Pankaj
• Assistant Examiner(s): Jones; Prenell P
• Application Number:
  US10/229,461
• Time in Patent Office: 3,136 Days
• Field of Search: 370/392, 370401-407, 370/236, 370/238, 370/248, 370/352, 370/237, 370/310, 370/389, 370/386, 370/433, 370/465, 370/328, 370/349, 370/395, 370/400, 370/338, 370/466, 370/229, 370/329, 370/342, 370/38, 370/351, 710/36, 710/3, 710/22, 713/52, 713/171, 709/222, 709/229, 709/244, 709/250, 709/236, 709/245, 709/238, 709/223, 709/249, 709/216, 709/200, 711/163, 711/112, 711/202, 455/430, 455/461, 455/554.1, 455/426, 455/427, 455/428, 455/431, 455/418, 455/420, 455/411, 455/436, 455/446, 455/404, 455/435, 455/422, 455/456, 340/870, 340/539, 340/572, 340/825, 340/573, 375/132, 375/106, 379/106, 379/215, 379/79, 379/45
• US Class Current: 370/338
• CPC Class Codes: H04L 12/5691 Access to open networks; Ingress point selection, e.g. ISP selection
• CPC Class Codes: H04L 47/824 Applicable to portable or mobile terminals
• CPC Class Codes: H04L 47/825 Involving tunnels, e.g. MPLS
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 88/16 Gateway arrangements

Abstract

In a telephony communication system, a mobile device requests access to packet-based networks using network access requests that identify access point names associated with these networks. The mobile devices and gateways providing access to the networks support the use of virtual access point names within network access requests. These virtual access point names need not correspond to any existing networks. Rather, network access requests incorporating virtual access point names indicate actually requested access point names within other fields of the network access requests.

Claims

1. A method for processing network access requests for mobile devices, the method comprising:

receiving a request, at a gateway, to establish a communication link for data communications for a mobile device, the request comprising a network identifier field indicating a packet-based network;

determining a type of the indicated packet-based network; and

if the type is virtual, accessing a pass-through field of the request to determine an actually requested packet-based network.

2. The method of claim 1, wherein accessing comprises parsing the pass-through field at a delimiter to determine a data value and the actually requested packet-based network.

3. The method of claim 2, wherein the pass-through field is a user identifier field, and the data value is a user identifier.

4. The method of claim 1, wherein receiving the request further comprises receiving the request from a serving generalized packet radio service (GPRS) support node (SGSN), wherein the request is a create packet data protocol (PDP) context request, and the network identifier field is an access point name information element.

5. The method of claim 1, further comprising, if the type is virtual:

determining an authentication server based on the actually requested packet-based network;

determining a user identifier from the request;

validating the user with the authentication server; and

if the user is validated, communicating a response indicating the authorization and establishing the communication link.

6. The method of claim 5, wherein the communication link comprises a generalized packet radial service (GPRS) tunneling protocol (GTP) tunnel for transporting data between a serving GPRS support node and a gateway GPRS serving node.

7. The method of claim 1, further comprising:

maintaining a plurality of access point name (APN) entries each comprising an APN value, a type indicating whether or not the APN value is virtual, and, if not virtual, an authorization server for verifying users requesting access to the APN value; and

wherein determining the type comprises accessing a matching one of the APN entries having an APN value matching the indicated packet-based network to determine a type specified for the matching APN entry.

8. A gateway linking an operator network to one or more packet-based networks, the gateway comprising:

an interface capable of receiving a request to establish a communication link for data communications for a mobile device, the request comprising a network identifier field indicating a packet-based network; and

a processor capable of determining a type of the indicated packet-based network and, if the type is virtual, to access a pass-through field of the request to determine an actually requested packet-based network.

9. The gateway of claim 8, wherein the processor is further operable to parse the pass-through field at a delimiter to determine a data value and the actually requested packet-based network.

10. The gateway of claim 9, wherein the pass-through field is a user identifier field, and the data value is a user identifier.

11. The gateway of claim 8, wherein the interface is further operable to receive the request from a serving generalized packet radio service (GPRS) support node (SGSN), wherein the request is a create packet data protocol (PDP) context request, and the network identifier field is an access point name information element.

12. The gateway of claim 8, wherein the processor is further operable to, if the type is virtual:

determine an authentication server based on the actually requested packet-based network;

determine a user identifier from the request;

validate the user with the authentication server; and

if the user is validated, communicate a response indicating the authorization and establishing the communication link.

13. The gateway of claim 12, wherein the communication link comprises a generalized packet radial service (GPRS) tunneling protocol (GTP) tunnel for transporting data between a serving GPRS support node and a gateway GPRS serving node.

14. The gateway of claim 8, further comprising:

a memory maintaining a plurality of access point name (APN) entries each comprising an APN value, a type indicating whether or not the APN value is virtual, and, if not virtual, an authorization server for verifying users requesting access to the APN value; and

wherein the processor is further operable to determine the type by accessing a matching one of the APN entries having an APN value matching the indicated packet-based network to determine a type specified for the matching APN entry.

15. A non-transitory computer readable medium encoded with computer executable instructions for processing network access requests for mobile devices, the computer executable instructions operable when executed to perform the steps of:

receiving a request to establish a communication link for data communications for a mobile device, the request comprising a network identifier field indicating a packet-based network;

determining a type of the indicated packet-based network;

if the type is virtual, accessing a pass-through field of the request to determine an actually requested packet-based network.

16. The non-transitory computer readable medium of claim 15, the instructions further operable when executed to parse the pass-through field at a delimiter to determine a data value and the actually requested packet-based network.

17. The non-transitory computer readable medium of claim 16, wherein the pass-through field is a user identifier field, and the data value is a user identifier.

18. The non-transitory computer readable medium of claim 15, the instructions further operable when executed to receive the request from a serving generalized packet radio service (GPRS) support node (SGSN), wherein the request is a create packet data protocol (PDP) context request, and the network identifier field is an access point name information element.

19. The non-transitory computer readable medium of claim 15, the instructions further operable when executed to, if the type is virtual:

determine an authentication server based on the actually requested packet-based network;

determine a user identifier from the request;

validate the user with the authentication server; and

if the user is validated, communicate a response indicating the authorization and establishing the communication link.

20. The non-transitory computer readable medium of claim 19, wherein the communication link comprises a generalized packet radial service (GPRS) tunneling protocol (GTP) tunnel for transporting data between a serving GPRS support node and a gateway GPRS serving node.

21. The non-transitory computer readable medium of claim 15, the instructions further operable when executed to:

maintain a plurality of access point name (APN) entries each comprising an APN value, a type indicating whether or not the APN value is virtual, and, if not virtual, an authorization server for verifying users requesting access to the APN value; and

determine the type by accessing a matching one of the APN entries having an APN value matching the indicated packet-based network to determine a type specified for the matching APN entry.

22. A gateway linking an operator network to one or more packet-based networks, the gateway comprising:

means for receiving a request to establish a communication link for data communications for a mobile device, the request comprising a network identifier field indicating a packet-based network;

means for determining a type of the indicated packet-based network;

means for, if the type is virtual, accessing a pass-through field of the request to determine an actually requested packet-based network.

23. A system for supporting wireless access of mobile devices to packet-based networks, the system comprising:

a serving node capable of receiving network request information from a mobile device, the network request information comprising a requested network value and a pass-through value, the serving node capable of validating the network request information with a home location register using the requested network value, to generate a network access request having a requested network field set to the requested network value and a pass-through field set to the pass-through value, to determine an internet protocol (IP) address to receive the network access request based on the requested network value, and to communicate the network access request to the determined IP address; and

a gateway capable of receiving the network access request, to determine that the requested network value indicates a virtual network, to determine an actually requested network from the pass-through value in the pass-through field, and to establish a communication channel with the serving node for the transport of packets communicated between the mobile device and the actually requested network.